Cutting Small deck footings into geogrid/retaining wall
Cutting Small deck footings into geogrid/retaining wall
(OP)
Its a segmental wall ranging from 4' to 6'. There are a couple layers of geogrid in it. Contractor wants to put a couple of 6x6 deck posts with probably a 12x12 concrete footing in the reinforced zone. Any tips on how to accomplish this? First thought was to go down to the base height of the wall so the additional surcharge load is not on the wall. Other option is to set it at the top and try and bound the design with the surcharge load. It won't be very big, few kips.
I've seen the allan block details for fences, etc. I also have the NCMA SRW design software for use. Thoughts?
Thanks
I've seen the allan block details for fences, etc. I also have the NCMA SRW design software for use. Thoughts?
Thanks





RE: Cutting Small deck footings into geogrid/retaining wall
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RE: Cutting Small deck footings into geogrid/retaining wall
Additionally, even though it is a code issue, so what if there is a little frost heave with a "small" deck?
Mike McCann, PE, SE (WA)
RE: Cutting Small deck footings into geogrid/retaining wall
Frost depth is not a problem 12" below grade is all that's required.
RE: Cutting Small deck footings into geogrid/retaining wall
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RE: Cutting Small deck footings into geogrid/retaining wall
Why the H(&) did he go through both layers of mesh? Did the bottom need to be founded in China?
Mike McCann, PE, SE (WA)
RE: Cutting Small deck footings into geogrid/retaining wall
I believe its a fairly new wall but since its 4 ft (our code doesn't require an engineered wall 4ft and less) to 6 ft in some locations and its residential, I doubt an engineer sealed it or even looked at the original wall.
Not sure exactly. It appears they were trying to lead me down that path since it turns out they already did it. Its 3 layers on the 6 ft wall.
RE: Cutting Small deck footings into geogrid/retaining wall
I think they are just going to have to dig out wider in the hole locations at each column and lap the mesh per standard type details. Basically rebuild the wall in those locations. Don't really see any way around that.
RE: Cutting Small deck footings into geogrid/retaining wall
Mike McCann, PE, SE (WA)