KEY BRIDGE PIER FOOTING IN TO ROCK
KEY BRIDGE PIER FOOTING IN TO ROCK
(OP)
I designed the bridge piers originally to be supported by driven H-Piles and a pile cap footing. The contractors encountered very hard rock within a foot of the proposed bottom of footing. We will be going with a spread footing rather than the pile cap footing. In the local DOT's bridge structures design manual, it states that the footing shall be keyed in to the rock if the bottom of footing elevation is within the scouring depth. I can not find any details for this and am not sure how deep the footing must be keyed in. Does anyone have any experience with this? Thanks for your help.






RE: KEY BRIDGE PIER FOOTING IN TO ROCK
RE: KEY BRIDGE PIER FOOTING IN TO ROCK
RE: KEY BRIDGE PIER FOOTING IN TO ROCK
RE: KEY BRIDGE PIER FOOTING IN TO ROCK
RE: KEY BRIDGE PIER FOOTING IN TO ROCK
Or do you really have a good solid foundation ("something hard that does not move") large enough (after the key is chipped out) to carry your bridge loads?