Bridge question

[davedj1]

I've driven my truck (5500 lb or so) over a bridge many times made up of two telephone poles with decking. There is a process known as glu-lams where they glue boards together to make very strong beams, some are found in churches, indoor pools etc. You could always go to your local lumber yard and have them give you the specs for your beam. Or find an engineer willing to divulge that info.
glulam beam - Google Search

 

[ovrszd]

Assuming that fabrication picture is of the bridge structure assembly shown upside down.
Nicely done!

What about the dog house?
When ya gonna fix that?

Hey, Willard scrounged a recliner out of the junk ditch, he don't need no stinkin dog house.

 

[ovrszd]

I've driven my truck (5500 lb or so) over a bridge many times made up of two telephone poles with decking. There is a process known as glu-lams where they glue boards together to make very strong beams, some are found in churches, indoor pools etc. You could always go to your local lumber yard and have them give you the specs for your beam. Or find an engineer willing to divulge that info.
glulam beam - Google Search

Length comes into play here very quickly. How long is your span?

 

[sarti]

16 foot span

 

[ovrszd]

16 foot span

Sorry, I was asking davedj1 in reply to his telephone pole bridge.

I think your design is sound as long as the laminated beams stay intact. That becomes the question.

Not sure if this was asked, how deep is the ditch you are spanning? If the bridge collapses can I still drive my tractor out of the hole??

 

[davedj1]

Length comes into play here very quickly. How long is your span?

Probably close to twenty feet.
The height wasn't far, maybe 4', just a bridge over a crick.

 

[ovrszd]

Probably close to twenty feet.
The height wasn't far, maybe 4', just a bridge over a crick.

The length dramatically changes the load capacity. Quickly.

I mentioned the height to diagnose the risk involved. Falling 4ft ain't bad. My bridge is 8ft. You gain a lot of speed falling that additional 4ft.

 

[Gordon Gould]

It was Kenny.

I've got two bridges in my timber.

The first is an ATV bridge that easily handles that task. I made it too narrow for a larger tractor or offroad buggy to get on. Purposely.

The second is wide enough to cross with any vehicle I own. For that reason I made it strong enough to handle any vehicle I own.

Over build once and have a long term bridge. Under build once and have a disaster.



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Hey Richard, what did you use for headers under each end of that very sharp bridge. Poured concrete, laid up stone, or what? I am in the thinking stages of a bridge like that for a summer project.

gg

 

[ovrszd]

Hey Richard, what did you use for headers under each end of that very sharp bridge. Poured concrete, laid up stone, or what? I am in the thinking stages of a bridge like that for a summer project.

gg

Gordon, I used slabs of concrete from sidewalks etc on one end, stacked. The other end had a solid vertical bank. There I used a large slab of limestone that I dragged in place.

 

[Gordon Gould]

Gordon, I used slabs of concrete from sidewalks etc on one end, stacked. The other end had a solid vertical bank. There I used a large slab of limestone that I dragged in place.

Thanks ! I was hoping you would say something other than poured concrete. Mine will be down in the woods a ways and I would like to avoid that. Side walk slabs is a good idea !

gg