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This picture is of the giant metal sheathing for the caissons (typically 6' dia. by 80' long, though the one shown is not) being raised into position. It follows the caisson drill down to hold the earth back. Then, the steel reinforcing cage is lowered into the caisson hole. (The steel bars get up to nearly 1 1/2" in diameter!) An inspector goes into the hole to make sure the reinforcing and all is properly made and properly placed. Then, they pump concrete into the hole while withdrawing the steel sheath. It's quite a production.
1 comment:
Yeah [shudder] I thought the same thing. He goes down on a harness and a line that someone is manning from above. I don't know if would be a job I'd be able - or want - to do!
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