Starting my bridge!!

[2manyrocks]

Build a great structure, but skimp on the abutment and then the creek bank will wash away underneath. Nature is going to look for the weak point.

 

[Doorman63]

There will be concrete abutments guys.

 

[Sodo]

Plus 1500 lbs of dirt in the bucket for 5500 lbs tractor weight?
And a mower on the 3-point?

That cable will increase strength substantially.
Maybe consider double cables, cuz you have extra.
Each with independent (redundant) mounting that one cable can hold the design load even if the other broke.

A truss-railing 2 feet high can add substantial strength - 5X as strong is easy.

Also that 2X6 cable-standoff in the middle, maybe weld a cross brace to the other side to ensure it remains vertical?

I'm with ya brother if I had free steel I'd build all kinda stuff!

 

[Doorman63]

Plus 1500 lbs of dirt in the bucket for 5500 lbs tractor weight?
And a mower on the 3-point?

That cable will increase strength substantially.
Maybe consider double cables, cuz you have extra.
Each with independent (redundant) mounting that one cable can hold the design load even if the other broke.

A truss-railing 2 feet high can add substantial strength - 5X as strong is easy.

Also that 2X6 cable-standoff in the middle, maybe weld a cross brace to the other side to ensure it remains vertical?

I'm with ya brother if I had free steel I'd build all kinda stuff!

Gonna weld a 4x4x1/4” chunk of tube to a 2x6 tube.

4000 with mower and loader
1500 pounds…….most likely not

 

[deezler]

There will be concrete abutments guys.

Good to hear. But I'm pretty curious how you build abutments after the bridge is already in place? Looking forward to the pics!

 

[Doorman63]

Good to hear. But I'm pretty curious how you build abutments after the bridge is already in place? Looking forward to the pics!

11’ x3’x18” deep slab
Post hole digger down approx 3’ in 2 or 3 spots as “anchors”
Concrete will encase approx 4” of the 6” tall tubes.
Rebar welded to tubes at various points and welded to some bar in the slab

 

[xj61975]

In my barn thread I mentioned a bridge build and people wanted me to post when I was building it.

Todays the day!!!

Approx 20’ span
Approx 7-8’ wide
2x6 tubes for the stringers
A center 2x6 tube under the stringers
3x3 tubes for cross members

6x6 treated timbers for the “foundations” on each end.

End goal is to drive a vehicle across!

View attachment 786740View attachment 786742View attachment 786743View attachment 786745

With the 2x6 stringers laying flat it's going to be very flexible, even with a support at mid span. What type of vehicle do you want to drive across it once completed?

 

[Streetcar]

2x6 tubes are 1/8” wall.
Outside tubes have a piece of 3x3x3/16 -20’ welded to them for the 3x3 cross tubes to sit on

There’s another 2x6 tube in the center under the 3x3 tubes

Tractor weighs approx 4000 pounds

View attachment 788698

I’m going to build this under each of the stringers out of 5/8 rebar. An Engineer “assisted” me with working out the idea.


I’ll probably also build 2’ or 3’ tall truss style railing on the outboard stringers.

Just about got the ok from the finance manager (wife) for some concrete to lock down both ends of the bridge. She hasn’t actually seen it in person yet!

I like to build stuff!
This is my 4th bridge on property.


A small 12’ long to walk across
View attachment 788701View attachment 788702View attachment 788703

A 3’ wide 25’ long to walk across
View attachment 788704


The first one I built
5’ wide 25’ long
Post in the center of the creek
ATV/foot traffic only

View attachment 788706

In stall your reinforcing king truss as soon as you can. Additional dead load of bracing and deck will help load it

 

[Doorman63]

With the 2x6 stringers laying flat it's going to be very flexible, even with a support at mid span. What type of vehicle do you want to drive across it once completed?

2x6 tubes are vertical

 

[pmjerding]

In my barn thread I mentioned a bridge build and people wanted me to post when I was building it.

Todays the day!!!

Approx 20’ span
Approx 7-8’ wide
2x6 tubes for the stringers
A center 2x6 tube under the stringers
3x3 tubes for cross members

6x6 treated timbers for the “foundations” on each end.

End goal is to drive a vehicle across!

View attachment 786740View attachment 786742View attachment 786743View attachment 786745

Having free material is a good problem to have.