CTQP Pile Driving Inspection 4

Question 1

What does a 'pile refusal' condition indicate during driving?

Accepted Answer

The pile has reached its design capacity and can no longer be driven

Answer

Pile refusal occurs when the pile meets resistance that prevents further penetration, typically indicating it has reached bearing capacity at or near design load.

Question 2

Which type of pile splice is generally considered the strongest for steel H-piles?

Accepted Answer

Full penetration butt weld

Answer

A full penetration butt weld develops the full strength of the pile section and is the preferred splice method for steel H-piles under high loads.

Question 3

When should a pile inspector record the 'set' measurement?

Accepted Answer

During the final set of blows near the end of driving

Answer

Set is measured during the final blows of driving — typically the last inch or fraction of an inch per blow — to determine bearing capacity using driving formulas.

Question 4

A concrete pile develops a longitudinal crack during driving. What is the most likely cause?

Accepted Answer

Excessive tension stresses from hammer rebound

Answer

Longitudinal (horizontal or tension) cracks in concrete piles are typically caused by tensile stress waves reflecting back up the pile during hard driving or near refusal.

Question 5

Under FDOT CTQP requirements, who is responsible for maintaining the pile driving log?

Accepted Answer

The pile driving inspector assigned to the project

Answer

The pile driving inspector is responsible for accurately maintaining the pile driving log, recording blow counts, penetration, and field observations throughout driving.

CTQP - Construction Training & Qualification Program Practice Test

CTQP - Construction Training & Qualification Program Practice Test

CTQP Pile Driving Inspection 4