Question

__________ it suitable when available working space is limited and the area to be enclosed is small.

(a) Single wall cofferdam

(b) Double wall cofferdam

(c) Dikes

(d) Concrete cofferdam

The question was asked during an internship interview.

The doubt is from Cofferdam and Caisson in portion Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

Answer 1

Correct answer is (a) Single wall cofferdam

The best I can explain: Single wall cofferdams is suitable up to a maximum depth of water of 25 m. In this type of cofferdam, a single row of Piles is used on either side of the cofferdam. The sheet pile maybe of wood or steel. The wooden piles are generally used for depth of water up to about 10 m.