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What is a helical pier or a caisson?

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What is a helical pier or a caisson?

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Helical piers are basically big drill bits attached to a steel column that is twisted into the ground. Caissons are drilled holes in the ground that get filled with concrete. Caissons are also called drilled piers. Both helical piers and caissons are used to go deep to get foundation support.

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