The bearing capacity of vibro-pile can be increased by ____

Who was the first to develop a method for placing cast-in-situ concrete piles?

Piles are commonly driven in to ground by means of special device called ______

The art of driving piles into the ground was first established by ______

The allowable load which the pile can carry safely is determined on the basis of ____

Franki piles are best suited for _____ type of soil.

The bearing value of the pressure pile can be increased by which of the following?

Raymond concrete pile is reinforced with _____