Quote:
Originally Posted by ConstructStudent
The reason why they drill from grade before excavating is due to logistics and cost. If they wait to drill caissons when the hole is 50 ft deep then they would have to hoist the caisson rig down with a large crane and it would take a considerable amount of more time. If they drill from grade they are able to maneuver better and will not require a crane to hoist them down and out.
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Ahhh, that DOES make sense.
Thanks for enlightening me (and perhaps a few others).
So when the caissons get drilled, installed, and poured from grade, I assume that they then get temporarily buried until the tops are uncovered at the end of the big dig?
[Maybe you should change your name here to ConstructTEACHER.
]