Prestressed concrete piles have been used as which type of piles in sands?

The spherical domes are supported by a ring beam at the ______

Pile shoes are required for driving through ______

In design of concrete pipes the full working pressure conforming to the limit state of ______

The percentage of reinforcement for prestressed concrete pipes varies between ______

In circular prestressing, the member may be prestressed by overlapping ______

Fold plates are widely used for ______

A reinforced concrete pressure pipe requires a large amount of ______