CTQP Pile Driving Inspection 3

Question 1

What is the minimum distance from a previously driven pile that a new pile can be driven without risk of damage?

Accepted Answer

Specified in the contract documents and geotechnical report

Answer

The minimum driving spacing is specified in the contract documents and geotechnical report based on soil conditions, pile type, and structural requirements.

Question 2

What is the purpose of measuring pile 'cutoff elevation'?

Accepted Answer

To determine how much pile must be removed after driving to match the design structural connection point

Answer

Cutoff elevation is the design elevation at which excess pile above the pile cap is removed, ensuring the pile connects to the structure at the correct point.

Question 3

What is a 'restrike' in pile driving and when is it performed?

Accepted Answer

Re-driving a pile after a waiting period to assess capacity after soil setup

Answer

A restrike is the re-driving of a pile after a waiting period (typically 24–72 hours) to assess how soil setup (freeze) or relaxation has changed the pile's capacity since initial driving.

Question 4

What type of pile is most commonly used in FDOT bridge foundation construction?

Accepted Answer

Prestressed concrete piles

Answer

Prestressed concrete piles (square or cylinder) are the most commonly specified pile type in FDOT bridge foundation work due to their durability in Florida's marine and corrosive environments.

Question 5

What is 'driving resistance' in pile driving inspection?

Accepted Answer

The resistance of the soil to pile penetration, measured in blows per foot or inch

Answer

Driving resistance is the measured resistance of the soil to pile penetration during driving, quantified as the blow count per unit of pile penetration.

CTQP - Construction Training & Qualification Program Practice Test

CTQP - Construction Training & Qualification Program Practice Test

CTQP Pile Driving Inspection 3