Question

Western button bottom piles uses ________ for driving.

(a) Concrete plug

(b) Auger

(c) Conical shoe

(d) Under-reamer

The question was asked in an interview.

The above asked question is from Cased Cast-in-Situ Concrete Piles in section Pile Foundations of Geotechnical Engineering II

Answer 1

Correct option is (a) Concrete plug

Easiest explanation: The western button pile uses a concrete plug, of the shape of a button to form an enlarged hole in the soil for driving.