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___________ is to be incorporated as a part of a permanent structure which have been proved to be economical.

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___________ is to be incorporated as a part of a permanent structure which have been proved to be economical.

(a) Concrete cofferdam

(b) Suspended cofferdam

(c) Single wall cofferdam

(d) Cellular cofferdam

The question was asked in an international level competition.

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

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The correct option is (a) Concrete cofferdam

Explanation: Concrete cofferdams are actually small concrete dams and they have been used economically on many Jobs. The Framework usually consists of precast RCC piles and sheets. The main disadvantage of a concrete cofferdam is that it is costly.

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