Many thanks I will try to incorporate as it is a removable structure. If i attach the deflection beams. To the base I could slot the columns in and bobs your uncle prevents movement and still removeable
Brilliant! I'm so glad you are tackling a motorway bridge properly. I did consider one but bottled out and now I'm half way through a dual carriageway instead! Getting a large scale concrete structure looking right is a decent challenge so look forward to progress. Next for me is to build lots of armco barriers and order the correct central reservation lights. i have found that for road markings, yellow lines etc. a very good artists quality wax pencil works well and you can mark them super fine. See you at the end! About people, I'm thinking of 3D scanning and printing my friends and some of our pets..
Many thanks I'm building my own armco trusty Evergreen strip. I won't be adding lighting though. My wife let me buy the laser cutter last year and I'm angling to get a 3d printer for doing people and other bits as I think long term will pay for itself. I am hoping constructing a dolls house and Fort for my grandchildren and then needing furniture my be the persuasive factor 🙂
End result is looking great! The main span beams conventionally sit on short flexible pads on the column head crossbeams. Generally seperate beams per span (not continuous). The pad is to allow expansion/contraction of the spans. Doubt you'd see the pads at scale though. What you might see is an expansion joint on any road surface above. In real life you get the clun- clunk as drive over them. :)
Looking good however I have one comment and that at the base of the columns would be a deflection beam at the base of the columns which would be typically 1.5m high so that should a train derail it would not demolish the columns which which would cause the bridge to collapse with catastrophic consequences the forces you to design for on the railway are so massive that you could never design a column which could resist the forces. Normally on the railway you move structures back to avoid the collision forces there is an exclusion zone you do. It build in for structures unless absolutely necessary . The gap you see at the top of the column and the underside of the cross beams is to provide bridge bearing which allow for movement. These have to be inspected on a regular basis and replaced if necessary.
looking good
@@PondersEndModelRailway thank you
Very nice scratch build looking good.
Thanks 👍
Many thanks I will try to incorporate as it is a removable structure. If i attach the deflection beams. To the base I could slot the columns in and bobs your uncle prevents movement and still removeable
Brilliant! I'm so glad you are tackling a motorway bridge properly. I did consider one but bottled out and now I'm half way through a dual carriageway instead! Getting a large scale concrete structure looking right is a decent challenge so look forward to progress. Next for me is to build lots of armco barriers and order the correct central reservation lights. i have found that for road markings, yellow lines etc. a very good artists quality wax pencil works well and you can mark them super fine. See you at the end! About people, I'm thinking of 3D scanning and printing my friends and some of our pets..
Many thanks I'm building my own armco trusty Evergreen strip. I won't be adding lighting though. My wife let me buy the laser cutter last year and I'm angling to get a 3d printer for doing people and other bits as I think long term will pay for itself. I am hoping constructing a dolls house and Fort for my grandchildren and then needing furniture my be the persuasive factor 🙂
End result is looking great!
The main span beams conventionally sit on short flexible pads on the column head crossbeams. Generally seperate beams per span (not continuous). The pad is to allow expansion/contraction of the spans. Doubt you'd see the pads at scale though. What you might see is an expansion joint on any road surface above. In real life you get the clun- clunk as drive over them. :)
Thanks for the tips!
Wet and Dry 1200 grade paper used in car workshops is great for tarmac roads as it is slightly grainy and can be painted or tinted with paints
Looking good however I have one comment and that at the base of the columns would be a deflection beam at the base of the columns which would be typically 1.5m high so that should a train derail it would not demolish the columns which which would cause the bridge to collapse with catastrophic consequences the forces you to design for on the railway are so massive that you could never design a column which could resist the forces. Normally on the railway you move structures back to avoid the collision forces there is an exclusion zone you do. It build in for structures unless absolutely necessary . The gap you see at the top of the column and the underside of the cross beams is to provide bridge bearing which allow for movement. These have to be inspected on a regular basis and replaced if necessary.