I have to do some drilling in my 1974 garage slab to install a car lift, will a bosch tool for metal and stud detection would point out if and where the rebar, or tension cable if present is?
Pretty good overall synopsis of pouring concrete with cable tension. Of course they're always going to be detractors but anything you missed in this video can be covered by some other video on youtube. There are plenty of them out there. The laser-guided auto screeds are fascinating and there are many videos out there of them and use which explain them a little better. One thing that I thought was interesting and show just how much thought went into them, is that they have a series of legs on them sort of like a spider. This is how they move around over rebar or cable tension without damaging it. They put a set of those legs down move back a little ways look those legs up but the other set of legs down etc and that way they can step over rebar or cable tension when they're out in the middle of a slab.
Are the finishing machines on the last scene basically hovercrafts, use these fans to lift themselves over the concrete? Or it it wheel-supported and the blades physically finish the concrete?
The spinning blades actually support the machine, think floor buffer as an example. They work with the same principle that those big floor buffers that you see janitors using in commercial. If you apply pressure to the left or right side of the handle on a floor buffer the machine will move left to right. It's actually the opposite direction that you apply pressure. If you apply pressure down or up the machine will move back and forwards. It's exactly the same with these ride on finishers, they vary the pitch of the blades on the left or the right side of the machine to move the machine in different directions. It's actually quite brilliant also very much like the way that a helicopter maneuvers. Everybody wants to ride these machines when they're on a construction site there are a lot of fun but take a little bit of experience to learn how to use.
The whirlly birds are called concrete finishing machines, there are some that have pans, called a pan machine and then some with just blades called a finisher
I drove concrete mixers for 10 years . It ain’t no joke at times. I poured a driveway that was straight up and down . I shot concrete out far away into footers perfectly . I’ve poured a slab once so smooth the finishers didn’t even scrap it .
I'm a heavy-civil construction superintendent in nyc for over 20yrs. I've had privilege to work with some of the best concrete guys in the biz. And I've never seen it either IF IT WAS A FINISHED SLAB, sure if it was just a rat slab for temp purposes or something that was going to have a covering, dragon board, pavers, ect. But not a finished slab. Not possible
Obviously I'm assuming there was going to be a covering of sorts. Pavers, tiles, something. But even then it takes a great mixer operator to do. Talent right there
That had to be one seriously expensive tennis court. I’d rather just go with #4 rebar 18” oac and make some saw cuts to control cracking. I understand why they don’t want joints in a tennis court, but even with post tension that huge slab is going to crack
@@andresmedina1279didn’t cover back up bars the sheathing is not for water etc.. it’s stainless it won’t “corrode” the sheathing is so concrete doesn’t touch the “tendon” so it can actually be stressed. say there’s a tear in the tendon sheathing it has to be taped or re sheathed and taped at both ends if there’s exposed tendon there’s also something called the drape if said drape isn’t right or if concrete gets inside the sheathing it can cause catastrophic failures during the final stress which can be VERY dangerous he shouldn’t be anywhere close to PT jobs if he isn’t certified in PTI nothing was mentioned about the “backup bars on the top AND bottom of the “anchors” which is very important if it calls for them and if you look at the thumbnail these were not installed right.. I’m studying for my PT cert as an inspector if that says anything.. I’m sure I missed things I haven’t learned yet but then again I’m studying to do this..
Is it just me or was this guy just misinformed the whole video. I appreciate him correcting himself but how many things did he wrong about that he had to correct himself later in the video
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great job. guys who do this kind of work, including those who manage and engineer it all, are the real heroes
Thanks man. I'm studying post tensioned concrete for my GC and this is a big help.
Hello buddy Where Can I Go To Study For That Trade
I Would like to know more About this Trade. Thanks in advance.
are those fence posts being set into the concrete? Or is there a plate being mounted or what not?
You didn’t show them tensioning the cables.
I have to do some drilling in my 1974 garage slab to install a car lift, will a bosch tool for metal and stud detection would point out if and where the rebar, or tension cable if present is?
Pretty good overall synopsis of pouring concrete with cable tension. Of course they're always going to be detractors but anything you missed in this video can be covered by some other video on youtube. There are plenty of them out there. The laser-guided auto screeds are fascinating and there are many videos out there of them and use which explain them a little better. One thing that I thought was interesting and show just how much thought went into them, is that they have a series of legs on them sort of like a spider. This is how they move around over rebar or cable tension without damaging it. They put a set of those legs down move back a little ways look those legs up but the other set of legs down etc and that way they can step over rebar or cable tension when they're out in the middle of a slab.
Are the finishing machines on the last scene basically hovercrafts, use these fans to lift themselves over the concrete? Or it it wheel-supported and the blades physically finish the concrete?
The spinning blades actually support the machine, think floor buffer as an example. They work with the same principle that those big floor buffers that you see janitors using in commercial. If you apply pressure to the left or right side of the handle on a floor buffer the machine will move left to right. It's actually the opposite direction that you apply pressure. If you apply pressure down or up the machine will move back and forwards. It's exactly the same with these ride on finishers, they vary the pitch of the blades on the left or the right side of the machine to move the machine in different directions. It's actually quite brilliant also very much like the way that a helicopter maneuvers. Everybody wants to ride these machines when they're on a construction site there are a lot of fun but take a little bit of experience to learn how to use.
The whirlly birds are called concrete finishing machines, there are some that have pans, called a pan machine and then some with just blades called a finisher
Does the machine not compromise the vapor barrier and rebar?
What determines weather you build the slab as a 6" PT or a 4" with Ribs PT?? (I'm new at this.)
I drove concrete mixers for 10 years . It ain’t no joke at times. I poured a driveway that was straight up and down . I shot concrete out far away into footers perfectly . I’ve poured a slab once so smooth the finishers didn’t even scrap it .
Lol as someone who currently test concrete and has been at a lot of concrete pours, I’m not sure that’s possible, but if it happened 🤷🏽♂️
I'm a heavy-civil construction superintendent in nyc for over 20yrs. I've had privilege to work with some of the best concrete guys in the biz.
And I've never seen it either IF IT WAS A FINISHED SLAB, sure if it was just a rat slab for temp purposes or something that was going to have a covering, dragon board, pavers, ect.
But not a finished slab. Not possible
Obviously I'm assuming there was going to be a covering of sorts. Pavers, tiles, something. But even then it takes a great mixer operator to do. Talent right there
That had to be one seriously expensive tennis court. I’d rather just go with #4 rebar 18” oac and make some saw cuts to control cracking. I understand why they don’t want joints in a tennis court, but even with post tension that huge slab is going to crack
How durable is this?
Might be nice if you answered the question you put in the title of your video. Or maybe you don't know?
Why not just use steel mats????? I’ve poured concrete for years and never ran into anything like that
Pump truck has pistons, not augers.
Concrete must be stronger in the U.S. They use 50% less reo
This Method of Slab Is Very Economic In Longer Span Only .Otherwise Uneconomic
Post tensioning is clearly not your field of study. Hopefully you have learned a lot more since this video.
Can you back up your comment with reasons? Otherwise, your comment is useless.
He said multiple times in the video that he had not seen this process before. He was very upfront about that.
@@andresmedina1279didn’t cover back up bars the sheathing is not for water etc.. it’s stainless it won’t “corrode” the sheathing is so concrete doesn’t touch the “tendon” so it can actually be stressed. say there’s a tear in the tendon sheathing it has to be taped or re sheathed and taped at both ends if there’s exposed tendon there’s also something called the drape if said drape isn’t right or if concrete gets inside the sheathing it can cause catastrophic failures during the final stress which can be VERY dangerous he shouldn’t be anywhere close to PT jobs if he isn’t certified in PTI nothing was mentioned about the “backup bars on the top AND bottom of the “anchors” which is very important if it calls for them and if you look at the thumbnail these were not installed right.. I’m studying for my PT cert as an inspector if that says anything.. I’m sure I missed things I haven’t learned yet but then again I’m studying to do this..
@@andresmedina1279 I'd take it one step further and say the commenter himself is useless
Dont know about the others but I learned something especially 1.5k then 15k and finally 33k psi of post tensioning 👍
Still never said what it was.
Sorry but I didn't learn much about the process.
Is it just me or was this guy just misinformed the whole video. I appreciate him correcting himself but how many things did he wrong about that he had to correct himself later in the video
bla bla bla, nothing about what the hell is the benefit or how it works.