3 ms·
It looks to me like they are using timbers as beams, simply supported on the steel piers. It's a very common bridge design for forest service roads and other ru
by ggcdn 8y ago
It looks to me like they are using timbers as beams, simply supported on the steel piers. It's a very common bridge design for forest service roads and other rural routes.
- niftich 8y agoCan you point out where you see timber beams in the photo? I can't even find a place where they would go; to me the deck looks like pour-in-place unreinforced concrete that sheared right off at the piers; the deck is then covered in what looks like gravel (which also seems a bit bizarre), then a wooden guardrail on wooden posts is bolted into the concrete deck.
- cmsmith 8y agoThe bridge looks to be precast concrete box-girders (hollow rectangular beams with plenty of steel reinforcement around the edges). The 'gravel' is the asphalt roadway (often this will be cast-in-place concrete) that's poured on top of the precast girders. The purpose of pouring the asphalt/concrete roadway on top is as a sacrificial wear element to prevent the structural beams being worn down by traffic.
- ggcdn 8y agoAh, it looked like timbers on my phone, but on a large screen it does look like precast. Definitely not unreinforced concrete though, and not poured in place. You can see how its made up of 6 individual beams https://i.imgur.com/Kt85XFR.jpg https://i.imgur.com/Kt85XFR.jpg