As a high school kid working for a concrete company as a mechanic I was able to 'enjoy' chipping full loads out of 8 yard cement trucks twice!! One truck was filled and went into the country down a very steep driveway that had a dip at the bottom. At the bottom of the dip the frame was so flexed that the clutch unclutched without being depressed. By the time they got that sorted out the concrete had actually set. To top it off once it was towed up the driveway far enough to get motive on it's own the real disaster happened. The driver re-engaged the drum and the hardened concrete rode up one side which caused the truck to roll over. It then rolled back to the bottom of the driveway!! There was a 90lb box of anchor bolts in the cab with the driver. He said his entire focus was on watching that box travel around and around the cab six times cleaning everything off the dashboard breaking all the glass and the removing the steering wheel and shift levers without ever hitting him. The second time a truck was filled to the limit and about 20 minutes later the output shaft of the large hydraulically driven gear reducer that ran the huge drum drive chain cleanly sheared off at the face of the drive. This prevented all further rotation of the drum, either forwards to delay setting or backwards to dump the load onto the waste yard ground. In full emergency mode my boss, the head mechanic, brought over another truck and ran the chain from the ailing truck over to the second truck's gear drive. When he ran that gear drive it simply sucked the two trucks together mangling various bits and pieces. End of that attempt. Both times I got to work and was told, "Here's hearing protection, there's the air line, here's a 20lb jackhammer. you'll have to start by jack-hammering while laying on your stomach. Work towards the clean-out panel first." I went home and got breathing protection too. Both took about 3 days to clean out. Miserable work (memorable though) especially with the summer sun beating on the drum.
Very miserable work for sure Kieth, glad you got some respiratory protection, I wonder if you also had a ducted fan sucking all of dust out as you went.
@@demolitiondavedrillandblast Hi Dave! Nope, there really wasn't room for a fan but the air out of the jackhammer provided some turnover and cooling (due to its expansion). Once the clean-out panel was freed and open, life became tolerable as some natural convection started happening. Very luckily one of the times the clean-out panel was at about 8 o'clock and the second time about 10 o'clock never 11-1 o'clock so manual lifting of 8 yards of concrete over my head wasn't required. In retrospect I think chipping out the concrete was more palatable than when he had me crawl seven stories up a mixing tower chute to lay on my stomach stick-welding wear spots. LOL
Right. I had to get up in the morning at ten o'clock at night, half an hour before I went to bed, drink a cup of sulphuric acid, work twenty-nine hours a day down mill, and pay mill owner for permission to come to work, and when we got home, our Dad and our mother would kill us, and dance about on our graves singing 'Hallelujah.'
Keith I feel your pain. I was on the receiving end only in minor instances. Fortunately I was in the wrong union. Where I worked the drivers were the ones who did most of the chipping. The company finally outsourced the clean out.
@@thejunkguy4655 I'd say that a shaped charge would probably create too much pressure directed towards the metal via the mix depending on where it's placed. From what I can see that carbon fibre aggregate is a real pig to try and cut
Smokeless powder? It has to be alot slower than the jelly or ANFO? More push and less shattering. Small diameter holes. I would go the Mythboys route and knock a hole in the roof. Good show as always. Great camera work.
Hi Dave, unfreaking believable! Not sure if i could be paid enough to crawl into that space and do what you do. Love the slo mo of the blast which you captured beautifully. Many thanks for all the time and effort you go to filming and editing your work. I know how much i appreciate it and I'm sure many other viewers too. All the best enduring yet another Melbourne lockdown, I'm hoping that your business is not too affected. Thanks again and best regards.
I would have thought the sequence would have started at the open end, and incremeted it's way back down the barrel, leaving each shot a fraction of room to move from the previous detonation. Obviously, my thinking is flawed, but I'm curious as to why.
Blimey. It made my blood run cold just reading and thinking about your comment. I used to climb rock faces, but there's no way I could go into a tight cave or mine space.
Wow, Dave, I am 6'5", and watching you work in such a confined space gives me the Willys. I hope they paid you well!!! I wouldn't have done that for less than $10K.
No problem at all, as a youngster with my friends we used to crawl through underground drain pipes, even ride our bikes nearly a mile through the large ones!
My first real job was working as a mechanic at an automobile dealership. We had taken in a cement mixer for a trade in among other vehicles from a local construction company. The mixer was about half full of hardened concrete. I was given a large pneumatic muffler chisel and a step ladder. At least the clean out door was right on the side of the drum. I borrowed a fan to put in the end, tied an old tee shirt over my nose and mouth and went for it. I did get some ear plugs from one of the mechanics that had guns. Three weeks of constant hammering got the job done. My boss was so thrilled he gave me one of the Jeeps that got traded in to drive as long as I wanted, All I did was gas it up and drive. I got known for doing the jobs no one else would do and it payed off! That was a........i can't help myself......bang-up job! One heck of a lot easier on the ears and knees than a pneumatic chisel! Keep up the good work and posting videos of it. I have a fondness for explosives as I worked for a contractor that removed stubborn stuff. I was merely a gopher......go fer this and go fer that driver but got to watch. In the military I worked with EOD some and watched there too. Thanks for taking us along to watch! Cheers Terry from South Carolina USA
No wonder I can't find any WW 231 powder, Dave's blowing it all up! I knew smokeless powder could go high order under the right circumstances, and I guess high nitroglycerin content, close confinement and a blasting cap are it. I think this is the first time I've seen it used as an explosive, though. Cool stuff.
Smokeless powder is widely used for low order rock breaking R.A.W. products such as Nonex, Autostem etc. are just smokeless powder wrapped in expensive packaging. I think it is ideal in this application because of it's good pourability because of the graphite coating.
Not to sound like a smartazz here but ammunition is a contained, timed explosion. The 1st of those is needed for the 2nd to occur; pressure = boom. Ja?
Not a nice job when you suffer from claustrafobia. Great footage! That concrete must indeed be incredible hard stuff. Nice to see a special project from time to time.
After the first blast was cleaned out there was a bit of room to move and it was not too bad, not the sort of work that I chase though. Thanks for watching Rob.
One of your the ones yet , Remines me of Opel mining in the early 70s with my dad . That was a lot of fun , but as usual the cleanup is the same . I expected to see a go pro doing somersaults out of the barrel , but no you got that right . Well don , bloody ripper .
This is so funny. I’ve been watching, and absolutely loving your back catalogue and I just finished part one of this video, 3 hours ago 😆 . Unfeakingbelieveable !! I must ask, have you ever done a viewer Question and Answer session ?
I have no issue with claustrophobia, I was every mothers nightmare, as youngster with my friends we used to crawl through underground drain pipes, even ride our bikes nearly a mile through the large ones!
Dad had what he called a "stump auger". It was about two feet long and 1½" diameter. He said it was used to drill thru and under a stump. He said they would use a quarter stick of dynamite and fill it with ammonium nitrate. Then pick up the pieces.
@@demolitiondavedrillandblast Somehow that sounds way more sensible than heavy earth moving machinery. Id rather listen to one kaboom than half an hour of noise and id rather pick up useful firewood than have my land covered in heavy equipment trails and wood chips...
Reminds me of a job in Broken Hill at the MMM mine. There were scrapping the old ore crushing mill, and the 8ft diameter grinding ball mill had been left sitting decades, still full of steel balls........some guy had the fun job of jack hammering them all out so it could be lifted out. Then they lifted what turned out to be a 25,000kg ball mill drum on a 15,000kg rated ceiling crane made in 1940. Go figure.
I'd be in the loony bin from a claustrophobia attack in there. It is the same brand/number, but is that powder the same grain size used in pistol cartridges or is it a coarse grain blasting version? Either way, definitely a "Do not try this at home, I'm a professional" situation. Looks the concrete had reinforcing fibers in it.
Dave my back was hurting really bad watching you hunched over doing the job. I hope you got paid extra pain money for this one. Great video as usual, stay safe buddy.😀👍🇦🇺
i hope they get you back. these 2 videos are amongst your most enjoyable. judging by how the barrel slowly stretched, its likely to be easy to empty most of the remains. ive done some confined space work chopping up concrete and this is a list of things i would take. knee pads, a cut down milk crate with a chair seat glued to it ( ive actually got 2 that have been cut down to different heights ), cushions for when you need to lie on your stomach, old foam carpet underlay or rugs to spread around and throw away when finished and better lights. i watched you fighting with the handlight trying to set it up. not all of this stuff would suit these cramped quarters. and of course its even more stuff to load on the back of the truck
Thanks VSV, before the first blast enabled the removal of some concrete it was very tight for movement inside, after that it got better. Sounds like you are a glutton for punishment like me.
@@demolitiondavedrillandblast , i claim that the line in the song "its a dirty job but someone's got to do it". was all about me. i pride myself as being able to do what others cant. a bloke i worked with in a tip (westgate park ) was a retired plumber who carried something like 13 shovels in his ute. some were rarely used but occasionally one of them might be the only one to get into an awkward place. i remembered what he told me. i have a great range of shovels. i learnt to apply the idea to theatres of action other than just digging holes, hence all the arse resting equipment. like the shovels, some of them are rarely used but by bloody christ i'm unhappy when i havent got them when i need them. we all watch you work on slippery slopes. i had a job repairing a pool fence and had to work from a slippery slope. i'd been sliding down every time i pushed on the drill. next day, i took one of those multi adjustable ladders and a cheap plastic set of steps. the adjustable ladder wasnt as useful as the cheap plastic steps just placed flat on the ground. it flexed to fit the rocky surface it was on. no slip. i dont trust these steps to use for their intended purpose but flat on the sloping rocky ground, it made this job easy. when i see you attempting to drill on the edge of a rock that god made into an awkward shape just to make your job difficult i wonder if you'd like to borrow my set of cheap flexible black plastic steps. actually they might have been bought in bunnings - watch out for them.
I find myself a little curious of how some expando-goo would do, though I suspect that with all the fibers and not having any weak fault lines to exploit it probably wouldn't do much, if anything at all.
If it was used I'd say that 45° holes would be best because it seems like it would break out almost in sheets due to how the fibre seems to have settled
Happy to see your PPE and ventilation working full time. After the chunks from this blast come out there's some air pick work to be done? I wonder if some tapping on the exterior with a 10 pound sledge hammer would loosen any of that cement? It seems that this blast used the correct amount of powder and the detonators. From my limited vantage point; there was almost zero wasted energy and zero property loss.
Was there's some air pick work to be done? .... Yeah, more than a bit! I gave it a crack just to see how difficult it was... never picked at concrete this hard, they did get it all out though.
Dave some years ago I watched myth busters they had a concrete truck that was about 1/3 full of dry concrete they tried several ways to get it clean then they did their usual thing and blew the whole truck to smithereens , the myth was can you clean a concrete drum completely in one day without damaging it
I know this is an old clip, but you realize that tin of 231 is almost an antique, let alone the fact that you cant buy any pistol powder anywhere in Australia at the moment. The tin of powder is probably worth more than the Adgi barrel! This is almost hard to watch
I'm shocked Jonathan, If you look back on the part 1 on this video you might see me with a grey rectangular tin of Nobel's #1 also... I just tossed the empty tin out. I don't pistol shoot but I know a guy that does and I think he imports and sells powder, I can check with him if you like.
Thé TV SHOW MYTH BUSTER IN USA has take an old cement truck and loaded it with concrete then loaded the empty space with NITRATE AMMONIUM and went far away , the truck was in a old gravel pit when it detonated the truck simply vaporized leaving a crater couple feet’s deep and parts of the truck up to 1 mil away . The mixer was filled with couple ton of explosives.
@@melin1969 We don't see if insurance is ok. Estimate the size of the charge then double it. Just how high can you make a tree stump fly. Answer: really really high.😏
It's ironic that the thing that made me most nervous in this job was all that concrete dust from cleaning out the holes. When you see an expert at work, you worry more about the environment they can't control instead of the hazards they do control. I just found your videos today, and have enjoyed them. Thanks for sharing with those of us who have less exciting jobs! (In the same vein, later on, I noticed a bunch of barrels of chemicals a few meters away. Probably foreshortening of the distance, and I'm sure they were probably hydraulic fluid and not some weird volatile. Still had a small "uhhhh... this is okay, right?" moment there, though.)
Thanks for watching Josh, Yes the concrete dust is hard to control, I have the big ducted fan sucking air through the barrel, yes the ducted fan has a filter box. and my little HEPA vac system but still reliant on my respirator as a last line of defense. Just oil in the drums.
Not high on the list at all Chris. No issue with claustrophobia though, as a youngster with my friends we used to crawl through underground drain pipes, even ride our bikes nearly a mile through the large ones!
What was in the bottom of the hole? That was a good dose of pistol powder you poured on top. I happen to use Hercules Red Dot vs the 231 in my reloads. Both are pretty 'fast' smokeless powders.
I think I might start selling short sections of burnt safety fuse packaged in corked test tube so that true believers can get a sniff of that real black powder smell any time they need to, what to you think Bruce?? Thanks for watching.
Of course Dave while working in the drum there was positive airflow? And lockout procedure was observed, once you blew up the concrete could they. rotate the drum to clean out the broken stuff. What kind of explosive did you use because of the nature of the beast. :)
Yes there was a big ducted vacuum and air filter system running. No possibility of drum rotating as an external hydraulic power source was required. To suit the very small diameter holes I used shock tube dets and a short length of very heavy (70g/m) det cord and some smokeless powder.
Would it not have been easier and less expensive to just buy a new bowl or as I call it drum, for the mixer? I know your services don't come cheap and then they're paying someone to clean out the rubble. Is there a part 3 we get to see that shows a clean drum?
while his services have their price, more often the lead time on a new drum and the subsequent halting of production and missed revenue is even higher. Drums can have a lead time of several weeks or even months. So not only is Dave faster than getting a new drum, he is also cheaper than multiple weeks of no production.
Wow talk about tight working conditions!!! But I had never thought about that for saving a drum that went hard!! Over here the only way is all jack hammers an?? It’s not a nice job to do but super great job Salvaging the drum
Hi Joe, most of them get jack hammered here also but this one was just too difficult because of the super hard mix and the fiber aggregate. Thanks for watching.
Y’know, if it were possible to rotate the barrel, I would try and see about rotating the barrel as far as possible in one direction without having to worry about the charges falling out, to try and get some kind of gravity assist. Also I’d look at lights with magnetic bases so you can stick them high up on the interior to work a bit more hands free.
Interesting that you are using a pistol powder, which technically is a propellent and not an explosive. I wouldn't think that you could generate enough pressure with just tamping dirt on top of the charge. I have been using WW231 for the past 40 years in my pistol handloads. Great video, as always!!
You sure can break rocks and concrete with propellants AL, using soil for stemming material will fail almost every time, I was using sharp crushed rock that had been screened down to a suitable size. One of the reasons that I chose a propellant is that is is not as violent as HE and being graphite coated it flows nicely into low angle holes. By comparison black powder would have been a lot more difficult to work with and added danger due to higher impact and spark sensitivity.
So Dave, I guess now we know what you do on rain days. Go find a nice dry concrete barrel to work in. That must have been a pain in the……neck, but seriously, that looked tedious to say the least. Thanks Dave for another great video.
According to Mythbusters, 800lbs of ANFO should be just about the right amount to clean out a cement mixer.......from the surface of the planet, that is.
Hey Dave, Sorry my friend, But I could of not gone in that drum like that. I would not fit LOL... That was a hell of a Bang. Just wondering how someone lets that happen to a Concrete drum. Glad I did not have to drill those holes. Enjoyed the Video, Thanks for sharing.
Thanks for watching Rich, the load set because of a hydraulic failure. I have no issue with claustrophobia, as a youngster with my friends we used to crawl through underground drain pipes, even ride our bikes nearly a mile through the large ones
You need to blast the outside of the drum to cause the steel to vibrate enough to release its grip with the cement. You will have to do a small amount of testing with your favorite explosive . I used some diet cord with a fairly low g/ft load of PETN (under 15 g but don’t take my word please). Also there my be a small dimpling of the drum but less than 1/8 inches deep. But it removed 90% of the concrete in a single shot. Also pre soaking concrete with a light acid solution helped greatly. Cheers
Interesting idea Wayne... I can not imagine that this would be a good idea inside a factory in an industrial area as I was working here... If I wrapped it up in cord, I think that I would get to meet all of the local officials fairly promptly....
We always chipped ours out. Well not we but a sub contractor. They brought in some real tough hombres. Short guys with big arms who wielded 60 or 90 lb jack hammers. They came with attitudes. Don’t bother saying hello. They would hammer out a drum in an evening.
I believe that that oversight is what they call a "career limiting move." About the same order as a PFC in the army getting caught horizontal and superimposed on a general's teenage daughter.
My boss would just drop the $26,000 on a new drum and write this off as a total loss. It’s cheaper than the liability of injury to anyone who has to go in the drum to hammer it. That’s the reality of operating a business int the USA, the ride in the ambulance would cost the company more than replacing the whole drum, painted, lettered and installed.
@@demolitiondavedrillandblast all drums are “custom” order. We have a print out with a diagram of the drum, have to fill in the measurements. There’s different size blades for the drum, flares on the end, flange sizes for the bolt point of the drive, different bolt patterns, the length varies based on the year and manufacture. So you can get one new, you just have to take bunch of measurements and hope it fits when it shows up lol
Did the owner of this mess finally pay up? I believe you were a little annoyed by the lack of prompt payment for services rendered. If I am wrong, my apologies.
That was a nasty concrete mix that got cought up in there. I've seen drivers clean drums with stun grenades and other big bang sticks (dont know or ever cared to ask where they gotthem from), but for those situations we got 8x20 meter rolls of construction PVC to lay in nearest ditch, hole or flat area to dump out the concrete mix if you cannot make it back to the base to dump it. Usually we dont get fines from eviromental agencies and we clean it up ASAP without any damage to the enviroment other than flattened grass.
another mixer barrel?? how many of those do you do a year?? a job like that seems perfect for D cord actually!! and that powder can!! how long have you had that all we've had up here for decades is plastic cans! not to mention the printing on it that's old school here! i haven't seen that style in 15 maybe 20 years! then again it might be a regional thing!
@@demolitiondavedrillandblast this was just leftover footage then? if you had said that was common packaging for gunpowder down there i'd been asking if you knew a shop that shipped internationally!! i hate these plastic cans we've got anymore!! bastards don't seal as good as the metal ones and dampness gets in faster!
Don’t recall if you’ve mentioned how this load of concrete was left in this mixer or not. If this was inside a mine then perhaps the crew had to evacuate posthaste due to flooding or methane gas and didn’t have time to clean it out. That would be my story. 👍
Done a couple of those myself. Drill a roughly .3 Meter B+ S to steel shell. Stem up 4 - 5 " use 2- 3 oz. of emulsion, stem with sand, and let her rip. Doesn't even dent the shell. Rotate drum a couple of times to loosen as much up, then reverse to self dump. We always do it on the truck, generates a lot of torque otherwise. Mythbusters are wankers!
@@demolitiondavedrillandblast I do a lot of demo, taking out 3/8" x 24" steel pipes filled with concrete, and imbedded in concrete. Drilled a 4' x1 5/8" hole, used 2 1 1/4" x 8" Gelatin dynamite. It only swelled the pipe a we bit. 4 sticks (2 # ) of the same in the same hole makes for about a 100' bit of fly rock, but not that bad. Next time you get a chance to break something in the vicinity of some steel plate, notice the results. Steel is amazingly strong. That barrel will take considerably more then you think. Experiment on something less valuable then the Barrel. My job, the owner was so pissed it happened, he said I don't care if you ruin it.I still wanted to do a good job, and not ruin his nice truck, but loaded in previously said manner. No problems. Barrel was dented where the driller didn't know how deep concrete was, so rattled the bit on the barrel too much. Those were the only dents in barrel. Definitely stem up a couple inches. Don't put a large depth with the HE in contact with the barrel. But I know you know this, I don't want some else who reads this to screw up.
Dave, does the smokeless powder give less or more of a pushing effect than black powder? I assume black powder would detonate faster than the smokeless powder burns/expands. I've no doubt that you can set me straight.
Hi TC, two of the relevant characterization parameters for propellants are "a" & "n", "a" is the burn rate coefficient, and "n" is the pressure exponent. Black powder has a higher "a" - unconfined burn rate but Smokeless has a way higher "n", meaning that the rate of burn increases much steeper with the pressure increase. Smokeless powder can generate at least 8 times the maximum pressure of regular black powder.
@@demolitiondavedrillandblast Your interaction and willingness to respond to comments are the reason that (in my opinion) your channel will become a success. It's probably why it got recommended to me. I do remember a couple of years ago seeing you dispatch a wasp or hornets nest in the ground though. I could be mis-remembering because I'm getting older. :D
I vacuumed up all of the wasps, I try hard to interact and promote the channel and as such have quite a few loyal subscribers... however I feel like I just can't get it to really boom for some reason (Ideological profiling by the platform - I don't support the lefty bias?) when compared to say a well known US earth moving channel , with half a million subs, often the same old footage with nothing special and almost no viewer interaction. e.g I have 14 videos with a click through rate >10% (Very high) that youtube will not promote.
Hydraulic hose or pump failure is the usual problem with truck mounted agitators, this one was from an underground mine, so it may have been and electrical supply failure??
@@demolitiondavedrillandblast So they were at least fortunate enough to be able to pull the unit out of the mine in one piece via the roadway. If it had been a shaft access mine, it would have been scrapped underground and the unit pushed into a disused mine lead and left for eternity.
Probably a stupid question, but: Now that a lot has been removed would it be possible to seal the openings and set off another charge inside to expand and contract the barrel? I wouldn't think the seal would have to be perfect, maybe just spot welded in place? Like I said it's probably hair brained, but I'd sure love to watch!
It was difficult, would have been better if I drilled the holes myself as they would not have all been half blocked and the placement would have been more logical from a logical blast pattern standpoint.
I was listening to the loud outside noise and wondered if you were using a spotter whilst you were inside to ensure other people knew you were inside and Ok? At least its dry concrete and not avgas or sewage!
As a high school kid working for a concrete company as a mechanic I was able to 'enjoy' chipping full loads out of 8 yard cement trucks twice!! One truck was filled and went into the country down a very steep driveway that had a dip at the bottom. At the bottom of the dip the frame was so flexed that the clutch unclutched without being depressed. By the time they got that sorted out the concrete had actually set. To top it off once it was towed up the driveway far enough to get motive on it's own the real disaster happened. The driver re-engaged the drum and the hardened concrete rode up one side which caused the truck to roll over. It then rolled back to the bottom of the driveway!! There was a 90lb box of anchor bolts in the cab with the driver. He said his entire focus was on watching that box travel around and around the cab six times cleaning everything off the dashboard breaking all the glass and the removing the steering wheel and shift levers without ever hitting him.
The second time a truck was filled to the limit and about 20 minutes later the output shaft of the large hydraulically driven gear reducer that ran the huge drum drive chain cleanly sheared off at the face of the drive. This prevented all further rotation of the drum, either forwards to delay setting or backwards to dump the load onto the waste yard ground. In full emergency mode my boss, the head mechanic, brought over another truck and ran the chain from the ailing truck over to the second truck's gear drive. When he ran that gear drive it simply sucked the two trucks together mangling various bits and pieces. End of that attempt.
Both times I got to work and was told, "Here's hearing protection, there's the air line, here's a 20lb jackhammer. you'll have to start by jack-hammering while laying on your stomach. Work towards the clean-out panel first." I went home and got breathing protection too. Both took about 3 days to clean out. Miserable work (memorable though) especially with the summer sun beating on the drum.
Very miserable work for sure Kieth, glad you got some respiratory protection, I wonder if you also had a ducted fan sucking all of dust out as you went.
@@demolitiondavedrillandblast Hi Dave! Nope, there really wasn't room for a fan but the air out of the jackhammer provided some turnover and cooling (due to its expansion). Once the clean-out panel was freed and open, life became tolerable as some natural convection started happening. Very luckily one of the times the clean-out panel was at about 8 o'clock and the second time about 10 o'clock never 11-1 o'clock so manual lifting of 8 yards of concrete over my head wasn't required.
In retrospect I think chipping out the concrete was more palatable than when he had me crawl seven stories up a mixing tower chute to lay on my stomach stick-welding wear spots. LOL
Right. I had to get up in the morning at ten o'clock at night, half an hour before I went to bed, drink a cup of sulphuric acid, work twenty-nine hours a day down mill, and pay mill owner for permission to come to work, and when we got home, our Dad and our mother would kill us, and dance about on our graves singing 'Hallelujah.'
@@ThePaulv12 You sound very into your job:)
Keith I feel your pain. I was on the receiving end only in minor instances. Fortunately I was in the wrong union. Where I worked the drivers were the ones who did most of the chipping. The company finally outsourced the clean out.
Put the camera around a corner out of harms way with a cheap mirror?
I hope you got paid an absurd amount of money for this job Dave. Wonderful watching an expert work!
Id assume less than the cost of a used replacement mixer
Pay was OK, and yes cost of repair is less than replacement.
Good to hear Dave! That one looked absolutely miserable in terms of working conditions.
Might try shape charges to get better separation on the fiber
@@thejunkguy4655 I'd say that a shaped charge would probably create too much pressure directed towards the metal via the mix depending on where it's placed.
From what I can see that carbon fibre aggregate is a real pig to try and cut
Having to clean out one of those things looks like brutally hard work.
It was! Not looking forward to the next one Bill.
Good ole 231 ive loaded thousands of rounds of .45 ACP with that stuff . Great video Dave
Just random stuff that someone gave me, thanks for watching Rob.
I thought it was a pistol powder. Has to be a fair age to come in that can, a bit like my mate's H110...
Smokeless powder? It has to be alot slower than the jelly or ANFO? More push and less shattering.
Small diameter holes. I would go the Mythboys route and knock a hole in the roof.
Good show as always. Great camera work.
Apollo Robb, my thoughts exactly! I was thinking, oh no! He’s using perfectly good pistol power !!!! LOL!!!
@ GARGLER42 - just had a look at the tin, 1984 sticker on the bottom.
Hi Dave, unfreaking believable! Not sure if i could be paid enough to crawl into that space and do what you do. Love the slo mo of the blast which you captured beautifully. Many thanks for all the time and effort you go to filming and editing your work. I know how much i appreciate it and I'm sure many other viewers too. All the best enduring yet another Melbourne lockdown, I'm hoping that your business is not too affected. Thanks again and best regards.
Thanks SS, I can work still because I'm an outdoor construction worker. Got a lot on at the moment.
I would have thought the sequence would have started at the open end, and incremeted it's way back down the barrel, leaving each shot a fraction of room to move from the previous detonation. Obviously, my thinking is flawed, but I'm curious as to why.
Hey Dave, Your concrete cave reminded me of a few narrow mine tunnels I've worked in. Great job - as always! Take Care, Stay well! Jim
Chasing the narrow veins hey.
Blimey. It made my blood run cold just reading and thinking about your comment. I used to climb rock faces, but there's no way I could go into a tight cave or mine space.
Now that is what I call care, control and precision…Bravo 👍👍👍
Thank you Swishy.
Wow, Dave, I am 6'5", and watching you work in such a confined space gives me the Willys. I hope they paid you well!!! I wouldn't have done that for less than $10K.
Pay was good but not that much. A job best suited for pygmies.
Watching you work inside the mixer gave me claustrophobia. i could not go inside the mixer. You're a better man than I am.
No problem at all, as a youngster with my friends we used to crawl through underground drain pipes, even ride our bikes nearly a mile through the large ones!
My first real job was working as a mechanic at an automobile dealership. We had taken in a cement mixer for a trade in among other vehicles from a local construction company.
The mixer was about half full of hardened concrete. I was given a large pneumatic muffler chisel and a step ladder. At least the clean out door was right on the side of the drum. I borrowed a fan to put in the end, tied an old tee shirt over my nose and mouth and went for it. I did get some ear plugs from one of the mechanics that had guns. Three weeks of constant hammering got the job done. My boss was so thrilled he gave me one of the Jeeps that got traded in to drive as long as I wanted, All I did was gas it up and drive. I got known for doing the jobs no one else would do and it payed off!
That was a........i can't help myself......bang-up job! One heck of a lot easier on the ears and knees than a pneumatic chisel!
Keep up the good work and posting videos of it. I have a fondness for explosives as I worked for a contractor that removed stubborn stuff. I was merely a gopher......go fer this and go fer that driver but got to watch. In the military I worked with EOD some and watched there too.
Thanks for taking us along to watch!
Cheers
Terry from South Carolina USA
I'm glad the you at least had an exhaust fan Terry, few people are able to imagine how difficult this job is. Thanks for watching and contributing.
No wonder I can't find any WW 231 powder, Dave's blowing it all up! I knew smokeless powder could go high order under the right circumstances, and I guess high nitroglycerin content, close confinement and a blasting cap are it. I think this is the first time I've seen it used as an explosive, though. Cool stuff.
Smokeless powder is widely used for low order rock breaking R.A.W. products such as Nonex, Autostem etc. are just smokeless powder wrapped in expensive packaging. I think it is ideal in this application because of it's good pourability because of the graphite coating.
Not to sound like a smartazz here but ammunition is a contained, timed explosion. The 1st of those is needed for the 2nd to occur; pressure = boom.
Ja?
Not a nice job when you suffer from claustrafobia. Great footage! That concrete must indeed be incredible hard stuff. Nice to see a special project from time to time.
After the first blast was cleaned out there was a bit of room to move and it was not too bad, not the sort of work that I chase though. Thanks for watching Rob.
i think dave mentioned in part 1 that it was 200mpa.
@@vsvnrg3263 Nothing like UHPC to screw up a truck.
They must really need that truck, great vid as usual.
Yes they do, this was a skid mounted unit from an underground mine, they use it for shotcreting the tunnel walls.
That was the coolest way to see a demolition Dave thanks for the share✌️Napa California
Glad you enjoyed it, Thanks for watching Sean.
One of your the ones yet , Remines me of Opel mining in the early 70s with my dad . That was a lot of fun , but as usual the cleanup is the same . I expected to see a go pro doing somersaults out of the barrel , but no you got that right . Well don , bloody ripper .
Thanks for watching Bob!
This is so funny. I’ve been watching, and absolutely loving your back catalogue and I just finished part one of this video, 3 hours ago 😆 . Unfeakingbelieveable !! I must ask, have you ever done a viewer Question and Answer session ?
Thanks for watching TM, I answer a lot of questions here in the comments.
@@demolitiondavedrillandblast That’s awesome, I’ll have to start going through them.
@@demolitiondavedrillandblast I'll second tinMans suggestion!! That would be a great live stream!
@@demolitiondavedrillandblast case in point! Lol
you triggered my claustrophobia / vertigo on this one Dave, it was you crawling in that tight space that did it.
time to go work in the paddock lol
I have no issue with claustrophobia, I was every mothers nightmare, as youngster with my friends we used to crawl through underground drain pipes, even ride our bikes nearly a mile through the large ones!
Good job Dave !
Thanks and thanks for watching!
After watching this I will never complain about confined space work again.
There is worse! I have done some work for a commercial diver, he does all kinds of strange stuff including diving in sewerage facilities!
Get them to send in a finished picture, that job is full on.
It's back in service now.
Dad had what he called a "stump auger". It was about two feet long and 1½" diameter. He said it was used to drill thru and under a stump. He said they would use a quarter stick of dynamite and fill it with ammonium nitrate. Then pick up the pieces.
That sounds like the way it was done in the days before heavy earth moving machinery. Thanks for watching Craig.
@@demolitiondavedrillandblast Somehow that sounds way more sensible than heavy earth moving machinery. Id rather listen to one kaboom than half an hour of noise and id rather pick up useful firewood than have my land covered in heavy equipment trails and wood chips...
Good to see good ol' powder being used!
Reminds me of a job in Broken Hill at the MMM mine. There were scrapping the old ore crushing mill, and the 8ft diameter grinding ball mill had been left sitting decades, still full of steel balls........some guy had the fun job of jack hammering them all out so it could be lifted out. Then they lifted what turned out to be a 25,000kg ball mill drum on a 15,000kg rated ceiling crane made in 1940. Go figure.
Oh, that does not sound like a good idea.
@@demolitiondavedrillandblast I got the shock of my life when I put the Kenworth on the weigh bridge with the Ball Mill onboard.
Oh Dave, I don't envy you on this one at all. A nightmare job, no matter which way you look at it.
100% Mark.
I'd be in the loony bin from a claustrophobia attack in there. It is the same brand/number, but is that powder the same grain size used in pistol cartridges or is it a coarse grain blasting version? Either way, definitely a "Do not try this at home, I'm a professional" situation. Looks the concrete had reinforcing fibers in it.
It was just fine smokeless powder that somebody gave me. Yes, fiber reinforced for shotcreting tunnel walls in an underground mine.
Dave my back was hurting really bad watching you hunched over doing the job. I hope you got paid extra pain money for this one. Great video as usual, stay safe buddy.😀👍🇦🇺
I was fine Peter, thanks for watching.
I'd love to know the weight of material removed.
Bet the mgs goes up a bit.
Great video Dave ! Interesting diversion from your usual job.
Glad you enjoyed it Gordon.
8:18 Sounds like a huge beast from a sci-fi movie....
That's a good little camera
It is, DJI Osmo Action, very similar to a GoPro but unlike GoPro, DJI offer full service back up.
i hope they get you back. these 2 videos are amongst your most enjoyable. judging by how the barrel slowly stretched, its likely to be easy to empty most of the remains. ive done some confined space work chopping up concrete and this is a list of things i would take. knee pads, a cut down milk crate with a chair seat glued to it ( ive actually got 2 that have been cut down to different heights ), cushions for when you need to lie on your stomach, old foam carpet underlay or rugs to spread around and throw away when finished and better lights. i watched you fighting with the handlight trying to set it up. not all of this stuff would suit these cramped quarters. and of course its even more stuff to load on the back of the truck
Thanks VSV, before the first blast enabled the removal of some concrete it was very tight for movement inside, after that it got better. Sounds like you are a glutton for punishment like me.
@@demolitiondavedrillandblast , i claim that the line in the song "its a dirty job but someone's got to do it". was all about me. i pride myself as being able to do what others cant. a bloke i worked with in a tip (westgate park ) was a retired plumber who carried something like 13 shovels in his ute. some were rarely used but occasionally one of them might be the only one to get into an awkward place. i remembered what he told me. i have a great range of shovels. i learnt to apply the idea to theatres of action other than just digging holes, hence all the arse resting equipment. like the shovels, some of them are rarely used but by bloody christ i'm unhappy when i havent got them when i need them. we all watch you work on slippery slopes. i had a job repairing a pool fence and had to work from a slippery slope. i'd been sliding down every time i pushed on the drill. next day, i took one of those multi adjustable ladders and a cheap plastic set of steps. the adjustable ladder wasnt as useful as the cheap plastic steps just placed flat on the ground. it flexed to fit the rocky surface it was on. no slip. i dont trust these steps to use for their intended purpose but flat on the sloping rocky ground, it made this job easy. when i see you attempting to drill on the edge of a rock that god made into an awkward shape just to make your job difficult i wonder if you'd like to borrow my set of cheap flexible black plastic steps. actually they might have been bought in bunnings - watch out for them.
I find myself a little curious of how some expando-goo would do, though I suspect that with all the fibers and not having any weak fault lines to exploit it probably wouldn't do much, if anything at all.
I have thought about trying this myself.
@@demolitiondavedrillandblast maybe do a test in an old cement mixer that’s done
If it was used I'd say that 45° holes would be best because it seems like it would break out almost in sheets due to how the fibre seems to have settled
How about a follow up after the cleaning?
I did not get to see it Ray.
Where's the earth shattering KaBoom......? Mythbusters said there would be one :)....... Love your work Dave.
Thanks for watching Alistair.
Happy to see your PPE and ventilation working full time. After the chunks from this blast come out there's some air pick work to be done? I wonder if some tapping on the exterior with a 10 pound sledge hammer would loosen any of that cement? It seems that this blast used the correct amount of powder and the detonators. From my limited vantage point; there was almost zero wasted energy and zero property loss.
Was there's some air pick work to be done? .... Yeah, more than a bit! I gave it a crack just to see how difficult it was... never picked at concrete this hard, they did get it all out though.
Dave some years ago I watched myth busters they had a concrete truck that was about 1/3 full of dry concrete they tried several ways to get it clean then they did their usual thing and blew the whole truck to smithereens , the myth was can you clean a concrete drum completely in one day without damaging it
Have done it several times so I would say that it is true.
I have to say I was very surprised at how small the actual explosion was. Seemed to be very effective though :D
It was lots of little sequential explosions.
3rd👍's up demolition Dave thanks for taking us all along with you for a real blast of a Time
Thanks for watching Scott
@@demolitiondavedrillandblast my pleasure please be safe out there thanks again for having us all along for a real blast
I know this is an old clip, but you realize that tin of 231 is almost an antique, let alone the fact that you cant buy any pistol powder anywhere in Australia at the moment. The tin of powder is probably worth more than the Adgi barrel! This is almost hard to watch
I'm shocked Jonathan, If you look back on the part 1 on this video you might see me with a grey rectangular tin of Nobel's #1 also... I just tossed the empty tin out. I don't pistol shoot but I know a guy that does and I think he imports and sells powder, I can check with him if you like.
@@demolitiondavedrillandblast Some of those older tins are collected too,ah for the old days when this stuff was plentiful
Thé TV SHOW MYTH BUSTER IN USA has take an old cement truck and loaded it with concrete then loaded the empty space with NITRATE AMMONIUM and went far away , the truck was in a old gravel pit when it detonated the truck simply vaporized leaving a crater couple feet’s deep and parts of the truck up to 1 mil away . The mixer was filled with couple ton of explosives.
Yeah, made for good TV.
Glad you didn't load it like Mythbusters.
One sec there is a cement truck then flash the whole cement truck disappeared.
the episode (amongst others) was just 2 big kids seeing how far they could go and get away with insurance wise
@@melin1969
We don't see if insurance is ok.
Estimate the size of the charge then double it.
Just how high can you make a tree stump fly.
Answer: really really high.😏
Some jobs are easy and some are just 🥵🥵🥵🥵good one Dave 👍
Not my favorite type of job Kerry.
Dave Please tell me that the individual that left the concrete in there was fired or they were in there with the blast!!
I don't know what happened to him.
It's ironic that the thing that made me most nervous in this job was all that concrete dust from cleaning out the holes. When you see an expert at work, you worry more about the environment they can't control instead of the hazards they do control.
I just found your videos today, and have enjoyed them. Thanks for sharing with those of us who have less exciting jobs!
(In the same vein, later on, I noticed a bunch of barrels of chemicals a few meters away. Probably foreshortening of the distance, and I'm sure they were probably hydraulic fluid and not some weird volatile. Still had a small "uhhhh... this is okay, right?" moment there, though.)
Thanks for watching Josh, Yes the concrete dust is hard to control, I have the big ducted fan sucking air through the barrel, yes the ducted fan has a filter box. and my little HEPA vac system but still reliant on my respirator as a last line of defense. Just oil in the drums.
You a Ham Josh?
That was interesting Dave.👍👍👍👍👍👍
Thanks for watching GG
Love your content mate! Keep up the good work!
Thanks Troy.
Yeesh. Somebody really wanted to avoid shopping for a new mixer.
Fascinating, if claustrophobic for you! Pretty low on your list of favorite jobs methinks Dave! 231 ball powder eh! Camera did very well.
Not high on the list at all Chris. No issue with claustrophobia though, as a youngster with my friends we used to crawl through underground drain pipes, even ride our bikes nearly a mile through the large ones!
At this point 1,725 views, 101 positive comments and one lone "I dislike this." Just proves you can not make everybody happy.
Always 2 in the first few hours Steve - sour grapes competitors.
@@demolitiondavedrillandblast Counts the same as an up vote, so they are contributing.
Hi.So would they turn it on now and maybe get some concrete out?I would like to see it turn a bit after that blast.
Needs a big hydraulic power source to make it turn, this was mounted separately and was not supplied with the drum.
You have had that can of 231 for a while. Has to be from the 70's. 37% NG fastest of the Win ball propellants
I think it had 1984 on the bottom of the tin.
What was in the bottom of the hole? That was a good dose of pistol powder you poured on top. I happen to use Hercules Red Dot vs the 231 in my reloads. Both are pretty 'fast' smokeless powders.
There was a regular detonator with a 100mm piece of heavy det cord on the end and then the powder was added.
They called in the right man. How did that poor mixer get that way?
Electrical failure I think.
I could almost smell the ether when ya opened that tin!!
I think I might start selling short sections of burnt safety fuse packaged in corked test tube so that true believers can get a sniff of that real black powder smell any time they need to, what to you think Bruce?? Thanks for watching.
I see you used some Winchester Western 231 ball pistol powder. I used that in the past as well. But for pistol ammo reloading... Thumbs Up!
Somebody gave it too me and this was a good use for it.
Did you use black powder in the tin
Smokeless powder. Yes.
Dave don’t know if have seen this blogger, but I think you may enjoy this guy “M Bjoernstroem”
Wow, thanks for that, just watched his video using the petrol rock drill, I have 4 of these.
Of course Dave while working in the drum there was positive airflow? And lockout procedure was observed, once you blew up the concrete could they. rotate the drum to clean out the broken stuff. What kind of explosive did you use because of the nature of the beast. :)
Yes there was a big ducted vacuum and air filter system running. No possibility of drum rotating as an external hydraulic power source was required. To suit the very small diameter holes I used shock tube dets and a short length of very heavy (70g/m) det cord and some smokeless powder.
Would it not have been easier and less expensive to just buy a new bowl or as I call it drum, for the mixer? I know your services don't come cheap and then they're paying someone to clean out the rubble. Is there a part 3 we get to see that shows a clean drum?
while his services have their price, more often the lead time on a new drum and the subsequent halting of production and missed revenue is even higher. Drums can have a lead time of several weeks or even months. So not only is Dave faster than getting a new drum, he is also cheaper than multiple weeks of no production.
Wow talk about tight working conditions!!! But I had never thought about that for saving a drum that went hard!! Over here the only way is all jack hammers an?? It’s not a nice job to do but super great job Salvaging the drum
Hi Joe, most of them get jack hammered here also but this one was just too difficult because of the super hard mix and the fiber aggregate. Thanks for watching.
Y’know, if it were possible to rotate the barrel, I would try and see about rotating the barrel as far as possible in one direction without having to worry about the charges falling out, to try and get some kind of gravity assist. Also I’d look at lights with magnetic bases so you can stick them high up on the interior to work a bit more hands free.
Interesting that you are using a pistol powder, which technically is a propellent and not an explosive. I wouldn't think that you could generate enough pressure with just tamping dirt on top of the charge. I have been using WW231 for the past 40 years in my pistol handloads. Great video, as always!!
You sure can break rocks and concrete with propellants AL, using soil for stemming material will fail almost every time, I was using sharp crushed rock that had been screened down to a suitable size. One of the reasons that I chose a propellant is that is is not as violent as HE and being graphite coated it flows nicely into low angle holes. By comparison black powder would have been a lot more difficult to work with and added danger due to higher impact and spark sensitivity.
Beauty shot.
So Dave, I guess now we know what you do on rain days. Go find a nice dry concrete barrel to work in. That must have been a pain in the……neck, but seriously, that looked tedious to say the least. Thanks Dave for another great video.
It was a pain in the everything Dale.
According to Mythbusters, 800lbs of ANFO should be just about the right amount to clean out a cement mixer.......from the surface of the planet, that is.
8lbs would have opened this up like a flower!
What a blasted job that was🙂💥💨
Yeah, not an easy job.
Hey Dave, Sorry my friend, But I could of not gone in that drum like that. I would not fit LOL... That was a hell of a Bang. Just wondering how someone lets that happen to a Concrete drum. Glad I did not have to drill those holes. Enjoyed the Video, Thanks for sharing.
Thanks for watching Rich, the load set because of a hydraulic failure. I have no issue with claustrophobia, as a youngster with my friends we used to crawl through underground drain pipes, even ride our bikes nearly a mile through the large ones
...wow, that's a big gun barrel..lol...good job, stay safe and have a great weekend...
Thanks Bob.
Such delicate, precise, intricate work in such claustrophobia & hazardous environments . .
B O O M ! ! ! 💥
"That was devastating." 👍
Thanks for watching Craig.
IS THERE MORE COMING?
Not for this project, more video coming soon though
@@demolitiondavedrillandblast OKAY, SO DID THE DEMO WORK?
You need to blast the outside of the drum to cause the steel to vibrate enough to release its grip with the cement. You will have to do a small amount of testing with your favorite explosive . I used some diet cord with a fairly low g/ft load of PETN (under 15 g but don’t take my word please). Also there my be a small dimpling of the drum but less than 1/8 inches deep. But it removed 90% of the concrete in a single shot. Also pre soaking concrete with a light acid solution helped greatly. Cheers
Interesting idea Wayne... I can not imagine that this would be a good idea inside a factory in an industrial area as I was working here... If I wrapped it up in cord, I think that I would get to meet all of the local officials fairly promptly....
What can you do with a truck full of hard concrete? Can't scrap it.
Exactly, difficult disposal problem, cheaper to fix it.
If you're by the ocean, it becomes an artificial reef!
We always chipped ours out. Well not we but a sub contractor. They brought in some real tough hombres. Short guys with big arms who wielded 60 or 90 lb jack hammers. They came with attitudes. Don’t bother saying hello. They would hammer out a drum in an evening.
Curious how much is a new drum?
No Idea, but more than fixing this one it would seem.
Oh ill bet the guy who let this set up got quite the earfull from the boss
I'd be giving more than an earful!
I believe that that oversight is what they call a "career limiting move." About the same order as a PFC in the army getting caught horizontal and superimposed on a general's teenage daughter.
@@demolitiondavedrillandblast 😁👍
i'm no expert but i think you're supposed to dump the concrete before it hardens
video unavailable for part 1 Dave.
Hmmmm....let me check
Fixed it thanks.
@@demolitiondavedrillandblast No problem. a polite statement letting you know is far better than viewers getting upset. ;)
My boss would just drop the $26,000 on a new drum and write this off as a total loss. It’s cheaper than the liability of injury to anyone who has to go in the drum to hammer it.
That’s the reality of operating a business int the USA, the ride in the ambulance would cost the company more than replacing the whole drum, painted, lettered and installed.
This one was a special build for a skid mounted mixer and not an "over the counter" item.
@@demolitiondavedrillandblast all drums are “custom” order. We have a print out with a diagram of the drum, have to fill in the measurements. There’s different size blades for the drum, flares on the end, flange sizes for the bolt point of the drive, different bolt patterns, the length varies based on the year and manufacture. So you can get one new, you just have to take bunch of measurements and hope it fits when it shows up lol
Did the owner of this mess finally pay up? I believe you were a little annoyed by the lack of prompt payment for services rendered. If I am wrong, my apologies.
Yeah, all good.
That was a nasty concrete mix that got cought up in there.
I've seen drivers clean drums with stun grenades and other big bang sticks (dont know or ever cared to ask where they gotthem from), but for those situations we got 8x20 meter rolls of construction PVC to lay in nearest ditch, hole or flat area to dump out the concrete mix if you cannot make it back to the base to dump it.
Usually we dont get fines from eviromental agencies and we clean it up ASAP without any damage to the enviroment other than flattened grass.
This one was mixing shotcrete in an underground mine and had a hydraulic failure.
Someone get the axe for forgetting to empty the mixer? Didn’t you work on one of these a year or so ago? Thanks for sharing.
This was part 2 of a job from back in May / June. The set load was caused by a hydraulic failure.
another mixer barrel?? how many of those do you do a year?? a job like that seems perfect for D cord actually!! and that powder can!! how long have you had that all we've had up here for decades is plastic cans! not to mention the printing on it that's old school here! i haven't seen that style in 15 maybe 20 years! then again it might be a regional thing!
That can of powder was gifted from a deceased estate, 1980's vintage. I would probably only do one of these a year and less if I could.
@@demolitiondavedrillandblast this was just leftover footage then? if you had said that was common packaging for gunpowder down there i'd been asking if you knew a shop that shipped internationally!! i hate these plastic cans we've got anymore!! bastards don't seal as good as the metal ones and dampness gets in faster!
That's excellent!
Thanks for watching Rod.
Don’t recall if you’ve mentioned how this load of concrete was left in this mixer or not. If this was inside a mine then perhaps the crew had to evacuate posthaste due to flooding or methane gas and didn’t have time to clean it out. That would be my story. 👍
It was in an underground mine and there was a hydraulic failure.
Makes sense. Thanks for the reply! Always enjoy your videos. 👍
Done a couple of those myself. Drill a roughly .3 Meter B+ S to steel shell. Stem up 4 - 5 " use 2- 3 oz. of emulsion, stem with sand, and let her rip. Doesn't even dent the shell. Rotate drum a couple of times to loosen as much up, then reverse to self dump. We always do it on the truck, generates a lot of torque otherwise. Mythbusters are wankers!
2-3 oz... your brave Mark, I generally top out at 1/3 of a plug of 25mm (1 inch) emulsion - about 37 grams.
@@demolitiondavedrillandblast I do a lot of demo, taking out 3/8" x 24" steel pipes filled with concrete, and imbedded in concrete. Drilled a 4' x1 5/8" hole, used 2 1 1/4" x 8" Gelatin dynamite. It only swelled the pipe a we bit. 4 sticks (2 # ) of the same in the same hole makes for about a 100' bit of fly rock, but not that bad. Next time you get a chance to break something in the vicinity of some steel plate, notice the results. Steel is amazingly strong. That barrel will take considerably more then you think. Experiment on something less valuable then the Barrel. My job, the owner was so pissed it happened, he said I don't care if you ruin it.I still wanted to do a good job, and not ruin his nice truck, but loaded in previously said manner. No problems. Barrel was dented where the driller didn't know how deep concrete was, so rattled the bit on the barrel too much. Those were the only dents in barrel. Definitely stem up a couple inches. Don't put a large depth with the HE in contact with the barrel. But I know you know this, I don't want some else who reads this to screw up.
Sure taking your time on this job since first vid was in May. Must be a govt job.
Hahaha, no, this video just ended up on the back burner for a while.
Dave, does the smokeless powder give less or more of a pushing effect than black powder? I assume black powder would detonate faster than the smokeless powder burns/expands. I've no doubt that you can set me straight.
Hi TC, two of the relevant characterization parameters for propellants are "a" & "n", "a" is the burn rate coefficient, and "n" is the pressure exponent. Black powder has a higher "a" - unconfined burn rate but Smokeless has a way higher "n", meaning that the rate of burn increases much steeper with the pressure increase. Smokeless powder can generate at least 8 times the maximum pressure of regular black powder.
@@demolitiondavedrillandblast Your interaction and willingness to respond to comments are the reason that (in my opinion) your channel will become a success. It's probably why it got recommended to me. I do remember a couple of years ago seeing you dispatch a wasp or hornets nest in the ground though. I could be mis-remembering because I'm getting older. :D
I vacuumed up all of the wasps, I try hard to interact and promote the channel and as such have quite a few loyal subscribers... however I feel like I just can't get it to really boom for some reason (Ideological profiling by the platform - I don't support the lefty bias?) when compared to say a well known US earth moving channel , with half a million subs, often the same old footage with nothing special and almost no viewer interaction. e.g I have 14 videos with a click through rate >10% (Very high) that youtube will not promote.
Was it a breakdown that caused concrete not to be emptied out of bowl? You deserve a beer or two after that tricky job 🍺🍺
Yes, hydraulic failure.
how does this even end up happening? Wouldn't you dump the load and clean it up instead of letting it set in the mixer?!
Accidents happen.
Hydraulic hose or pump failure is the usual problem with truck mounted agitators, this one was from an underground mine, so it may have been and electrical supply failure??
@@demolitiondavedrillandblast So they were at least fortunate enough to be able to pull the unit out of the mine in one piece via the roadway. If it had been a shaft access mine, it would have been scrapped underground and the unit pushed into a disused mine lead and left for eternity.
Probably a stupid question, but: Now that a lot has been removed would it be possible to seal the openings and set off another charge inside to expand and contract the barrel? I wouldn't think the seal would have to be perfect, maybe just spot welded in place? Like I said it's probably hair brained, but I'd sure love to watch!
the spiral fins welding mught get damaged if the concrete didn't allow them to move with outside wall I'd say ... just my two centa
And its got fiber in it.
Yeah, that was a game changer for the jack hammer guys!
Perhaps after this they'll rig up a gravity-operated emergency mechanism to tip the drum up on end, just to avoid going through this again.
Drums have a hatch on the side, open it up, wrap a strap a round the drum like a toy top.
@@abraham1alltime65 Or that, which sounds even easier.
one day I'll be good just like you. of course? I would love to take some lessons with you.
G'day Dave
Hi again.
Is it really cheaper for you to blast it then just replace it?
Certainly, as well as the cost this one was a special build so the wait time would be significant.
wow that must have (not) been awesome sitting in there with wires sticking out everywere
I've had better jobs.
Would the expando-goo work in that situation?
The fiber in the cement would hinder the expansion.
I'll give it a try someday.
I work in a fab shop years ago we used expansion grout with varied results to clean out one truck mixer definitely not as fun as this!
Just curious how is this different from when Mythbusters did this? Not dissing you or anything just curious
Those guys were just out to make entertaining TV.
@@demolitiondavedrillandblast hmm good poin, also I think they used way more explosives then needed when they blew up an entire concrete truck.
I'm not going to say you couldn't pay me enough to do this job. You could, it would just be a _lot._ I mean, beyond the dreams of avarice.
It was difficult, would have been better if I drilled the holes myself as they would not have all been half blocked and the placement would have been more logical from a logical blast pattern standpoint.
@@demolitiondavedrillandblast Either way my knees and elbows are sore out of sympathy; I've been in some gnarly spots but not like that.
I was listening to the loud outside noise and wondered if you were using a spotter whilst you were inside to ensure other people knew you were inside and Ok? At least its dry concrete and not avgas or sewage!
There was a spotter / safety person.