Sunday, September 27, 2015

Learn free Civil Engineering by Civilustaad about DRILLED SHAFTS

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DRILLED SHAFTS
Drilled shafts, also known as caissons, are usually high-capacity cast-in-place deep foundation elements constructed by means of an auger. A hole having the design diameter of planned shaft is initially drilled to the design depth. If the hole requires support to remain open, casing or drilling fluid is used.



Full-length reinforcing steel is then lowered into the hole and the hole is packed with concrete.


The completed foundation element resists compressive, uplift and lateral loads.


The technique has been used to hold up buildings, tanks, towers and bridges.


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