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Demolition of Below Grade Water Clearwells

Demolition of Below Grade Water Clearwells

Demolition of Below Grade Water Clearwells

(OP)
Does anyone have experience with demolition of below grade concrete water storage tanks? We are abandoning a plant with old clearwells and we want to make some greenspace.

There are two lines of thought: #1. Remove the roof piece by piece, haul off, cut the walls down to 3ft below grade, haul off, then backfill with sand and topsoil and reseed. #2. Demo roof into the clearwell, demo walls to 3ft below grade, dispose in clearwell, backfill with sand and topsoil and reseed.

#2 would seem to have the problem of continual backfilling as the sand settles into the rubble. #1 seems it could be pretty expensive.

Anyone have any experience with this and would have a recommendation on the direction to take?

RE: Demolition of Below Grade Water Clearwells

We did a project using method #1. You probably need to put some holes in the bottom to allow for drainage. Otherwise the structure will retain water. We used gravel instead of sand.

RE: Demolition of Below Grade Water Clearwells

depending on water table you might want to bust some holes in bottom slab and lower wall sections to avoid potential buoyancy.

RE: Demolition of Below Grade Water Clearwells

My thoughts without direct experience, other than I know a lot of cities got built up over ruins of earlier times...

I'd think #2 would be fine as long as you're not building a tennis court over the top.
I agree some holes in the wall and/or floor would prevent possible water buildup, although what would be the harm?

Flotation-wouldn't happen, gravel/sand weighs more than water.

Compacting the first lifts well should keep future settlement chances minimal.

 

RE: Demolition of Below Grade Water Clearwells



Flotation-wouldn't happen, gravel/sand weighs more than water?????????????

erm steel weighs more than water and ships float dont they??

RE: Demolition of Below Grade Water Clearwells

The clearwell is to be filled with sand & gravel, which will weigh more than weight of water displaced. A steel ship filled with sand & gravel also will sink. :)


 

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