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__________ are the cofferdams which can be lifted, floated and placed in another position as soon as its purpose is served.

(a) Dike cofferdam

(b) Double wall cofferdam

(c) Suspended cofferdam

(d) Single wall cofferdam

I had been asked this question in class test.

Question is from Cofferdam and Caisson topic in chapter Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

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Correct option is (c) Suspended cofferdam

Best explanation: Suspended cofferdams are also known as the movable cofferdams. The suspended cofferdams may take up any forms. In one form, it consists of a hollow steel cylinder which can be used to prepare a temporary enclosed space for the construction work.

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