Bridge Foundation Scouring Please HELP!!!
Bridge Foundation Scouring Please HELP!!!
(OP)
I have a small 32 foot bridge with some minor bridge scouring. Before the bridge gets scoured anymore I am looking at placing concrete around and underneath the bridge footings. I will lower the water level to try first but if unsuccessful I then will try underwater concrete bags and place them in the scour spots.
Does this sound reasonable to everyone here, I am a young Engineer and this seems the most practical to me. If you have any other ideas please throw them out there.
Does this sound reasonable to everyone here, I am a young Engineer and this seems the most practical to me. If you have any other ideas please throw them out there.






RE: Bridge Foundation Scouring Please HELP!!!
RE: Bridge Foundation Scouring Please HELP!!!
I think ali has a good recommendation with the riprap (I would call it gabion cages); Essentially these are galvanized steel cages filled with rocks.
Alternatively you can dig a trench down stream from the piers (normally about two times the river depth- This assumes a fairly shallow river), and optionally fill this with large boulders. This causes the rocks to build up and effectively re-buries your piers...
There are much more experienced bridge engineers around than I; Hopefully someone chimes in with an easier solution!
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Bridge Foundation Scouring Please HELP!!!
Determine the proper channel size through your bridge area. You may have to go with your best estimate of the historical profile. Place the rip rap several feet above and below the crossing on each bank to a depth approximately twice the size identified earlier.
You will almost certainly need a permit from someone before you can do this work. You will have to show that your proposal will not change the flow nor back up the water at your site. Because of this, you will probably have to get soemone involved that really knows how to run the HEC software. Good Luck.
RE: Bridge Foundation Scouring Please HELP!!!
USDOT, 1995b. Evaluating Scour at Bridges, Hydraulic Engineering Circular No. 18, Federal Highway
Administration, FHWA-IP-90-017, 3rd Ed.
Richardson, E.V., D.B. Simons, and P.F. Lagasse, 2001, "Highways in the River, Environment," FHWA NHI 01-004, Federal Highway Administration, Hydraulic Series No. 6, Washington, D.C.
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RE: Bridge Foundation Scouring Please HELP!!!
RE: Bridge Foundation Scouring Please HELP!!!
depth of flow
diameter of piers
geometry and configuration of piers and abutments
channel geometry such as bends and constrictions
grade controls downstream or upstream
soil types
natural armoring or lack of armoring
vegetation
flow duration
RE: Bridge Foundation Scouring Please HELP!!!
RE: Bridge Foundation Scouring Please HELP!!!