Steel sizes for bridge

[R J]

Hi all , does anyone know what steel sizes I would need for a 8m span bridge ,
Possibly using 4 RSJ'S and concrete pannels for deck and to carry around 18 tonne ?
Thanks

 

[Hard Graft]

What is the bridge for as I would feel 18t is not enough for a 8m deck as the uk road max axel weight 11.5t

 

[R J]

Mainly shortcut for combine across a brook

 

[BrianV]

Mainly shortcut for combine across a brook

Must be one hell of a brook to need an eight meter span, expecting mass flooding are you?

 

[Steevo]

@ColinV6 is the bridge master.

 

[R J]

Must be one hell of a brook to need an eight meter span, expecting mass flooding are you?

It's a fair brook

 

[bobk]

12 foot by 6 , 3 of .sleepers on top , cost a few £

Or pipe it and fill with stone

 

[goldeneagle]

Get a structural engineer to spec one, might be £500 to £1000 pounds but money well spent as a straightforward task. Steel sizes debates on here will give you a a vast amount of variations. If you cant work out what you need pay someone that does - they will also have insurance if it goes wrong.

 

[BrianV]

Just over two meters wide, four foot clearance, five 9 by 6 RSJs topped with 4 inch thick concrete panels & oak beams for the look, strong brook off Dartmoor,
What I did was go & measure the next bridge downstream & use that as a guide for the clearance you need.

 

[bobk]

Just over two meters wide, four foot clearance, five 9 by 6 RSJs topped with 4 inch thick concrete panels & oak beams for the look, strong brook off Dartmoor,
What I did was go & measure the next bridge downstream & use that as a guide for the clearance you need.

View attachment 1131477

Is that wood holding it up

 

[BrianV]

Is that wood holding it up

No, 9in x 9in well dried oak beams purely for the look as RSJs didn't look aesthetic enough, walls supported by the concrete panels as well. Should see me out.

 

[ColinV6]

If you’ve got doubts, just make it stronger

 

[Forever Fendt]

I have 4 beams 10m long 16"x16" flanges 30 mm thick good condition £350 per ton

 

[Blue.]

I used a 20' x 4' steel pipe for a large brook ,it sometimes floods a good 10' above it but its been fine for the last 23 years.

 

[David.]

Do check that EA haven't quietly designated your brook as a "Main River" as they have ours. Seems to count for nothing that it is only 4ft wide, and almost dries up in Summer.
That restricts what you can do on the banks and floodplain enormously.

 

[Forever Fendt]

365x365 x177 kg [email protected] long 1.876 ton each £650 each

 

[robs1]

Just buy an old artic and cut the axle off or a flat pack container and put two side by side

 

[BuskhillFarm]

Just buy an old artic and cut the axle off or a flat pack container and put two side by side

Mid Antrim tractors are selling the flat pack containers look a good job

 

[Pistonbroke]

We have a 25 ft bridge which is four 18x6 beams that are connected sideways with 12x4. Officially rated at 26 tons

 

[robs1]

We have a 25 ft bridge which is four 18x6 beams that are connected sideways with 12x4. Officially rated at 26 tons

What is the deck made of ?