Quote:
Originally Posted by IanWatson
So that sheet metal they're driving in is a coffer dam? How does that work? Are they driving it into earth? Or bedrock (is that possible)? And then I assume it holds out the water so they can pour concrete? Does it get removed at the end of construction, or is it just worked into the final construction?
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it probably goes down to bedrock. will be tie anchored back as they dig down. that area is all fill and seabed, so likely pretty unstable. Someone told me that the Queens Marque parking garage is watertight, and would actually float without the building on top holding it down.
typically they cut it off a few feet down and leave it there.