A __________ consist of timber cribs. A. Cellular cofferdam B.

a-consist-of-timber-cribs-a-cellular-cofferdam-b

A __________ consist of timber cribs.

A. Cellular cofferdam

B. Suspended cofferdam

C. Concrete cofferdam

D. Rock-filled crib cofferdam

I got this question in an interview.

I’m obligated to ask this question of Cofferdam and Caisson in chapter Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

Right answer is D. Rock-filled crib cofferdam

To explain: A crib is a box or a cell open at the bottom and it essentially consists of a framework of horizontal timbers laid in alternate courses. The Rock-filled crib cofferdam have been employed with success on many important Jobs. The ideal set of conditions favourable for this type of cofferdam is the depth of water is about 10 meters to 20 m.