Raymond concrete pile is reinforced with _____

In pressure pile, the frictional resistance is increased by ______

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

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

Routine tests are usually carried out on _____

The types of Raymond concrete piles in use are ______

Single acting hammers provide an advantage in ______ type of soil.

Western button bottom piles uses ____ for driving.