CM 2112 PILE DRIVING QUESTIONS WITH VERIFIED
ANSWERS
Steel piles can penetrate into soils that other types of pile cannot. - Answers - True
_________ is the most efficient as a friction pile. - Answers - Steel Pipe Piles
Which type of pile is excellent for fender system use? - Answers - Plastic with Steel
Pipe Core Piles
___________ is a type of pile that combines that advantages of a high-quality concrete
core with the high tensile strength of the external steel casing. - Answers - Steel-
Concrete Composite Pile
Which type of pile hammer is suitable for driving piles on remote projects that require
only a few piles and for which the time completion is not an important factor? - Answers
- Drop Hammer
strikes 40 to 60 blows per minute - Answers - Single-Action Hammers
advantageous when driving light to medium weight piles into soils having normal
frictional resistance - Answers - Double-Acting Hammers
modified single-acting hammer - Answers - Differential-Acting Hammer
Hydraulic Leads have a pivot point at the crane's boom top and a brace at the bottom
that attaches to the crane. - Answers - False
________ is a type of leads system that is not attached at the bottom of the crane or
driving platform. - Answers - Swing Leads
What type of leads system is not generally preferred for driving piles since it is more
difficult to position the pile accurately? - Answers - Swing Leads
__________ is a type of leads system that is more costly than standard fixed leads -
Answers - Hydraulic Leads
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 23,800 lb, what is the recommended hammer weight? - Answers - 23,800 lb
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 23,800 lb, what is the minimum weight that can be used? - Answers - Minimum
hammer weight = 0.33 x weight of pile
, 23,800 x 0.33 = 7,854 lb
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 17,500 lb, what is the minimum weight that can be used? - Answers - 0.33 x
17,500 = 5,775 lb
A closed pile hammer in which steam/air/diesel explosion/etc. is used both to lift the ram
and to accelerate the down stroke. - Answers - Double-Acting Hammer
A supporting pile for a structure that can be of wood, concrete or steel in any number of
shapes and whose bearing is reached by point or end bearing, friction, or friction and
compaction, or a combination. - Answers - Bearing Pile
Pile driven until friction between pile surface and soil are great enough to support loads
placed on them. Used when firm bearing is too deep to provide support for an end
bearing pile. - Answers - Friction Pile
A pile that may form one of a continuous line or row of timber, precast concrete, or steel
piles driven interlocked to provide a tight wall to exclude or resist lateral pressure of
water, adjacent earth or other materials. - Answers - Sheet Pile
A pile that supports the major portion of the load placed upon it by end or tip bearing on
a firm stratum existing at some depth below the ground surface. - Answers - End
Bearing Pile
A pile made up of two or more types or sizes of piles joined together. The connection
between the components is designed to transmit load and to prevent separation during
and after construction. - Answers - Composite Piles
Piles formed by boring or other methods of excavation. H, open-end pipe and sheet
piles are considered low-displacement piles. - Answers - Non-Displacement Piles
A concrete pile either reinforced or prestressed which is manufactured in a construction
yard or at the site, and having been properly cured, is handled and driven like a steel or
timber pile. - Answers - Precast Pile
Pile driving leads attached to the boom point of the crane, with or without a spotter. Can
only be moved fore or aft for batter pile. - Answers - Fixed Leads
A structure of fabricated steel or wood in which or on which a pile hammer travels up
and down and with which the hammer and pile assembly are aligned in driving position.
A complete hammer support system including lead column, brace, and other
components. - Answers - Leads
A rolled-steel section with web and flanges nearly the same thickness. The width and
depth are approximately equal. Also called H-Beam. - Answers - Steel H-Pile
ANSWERS
Steel piles can penetrate into soils that other types of pile cannot. - Answers - True
_________ is the most efficient as a friction pile. - Answers - Steel Pipe Piles
Which type of pile is excellent for fender system use? - Answers - Plastic with Steel
Pipe Core Piles
___________ is a type of pile that combines that advantages of a high-quality concrete
core with the high tensile strength of the external steel casing. - Answers - Steel-
Concrete Composite Pile
Which type of pile hammer is suitable for driving piles on remote projects that require
only a few piles and for which the time completion is not an important factor? - Answers
- Drop Hammer
strikes 40 to 60 blows per minute - Answers - Single-Action Hammers
advantageous when driving light to medium weight piles into soils having normal
frictional resistance - Answers - Double-Acting Hammers
modified single-acting hammer - Answers - Differential-Acting Hammer
Hydraulic Leads have a pivot point at the crane's boom top and a brace at the bottom
that attaches to the crane. - Answers - False
________ is a type of leads system that is not attached at the bottom of the crane or
driving platform. - Answers - Swing Leads
What type of leads system is not generally preferred for driving piles since it is more
difficult to position the pile accurately? - Answers - Swing Leads
__________ is a type of leads system that is more costly than standard fixed leads -
Answers - Hydraulic Leads
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 23,800 lb, what is the recommended hammer weight? - Answers - 23,800 lb
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 23,800 lb, what is the minimum weight that can be used? - Answers - Minimum
hammer weight = 0.33 x weight of pile
, 23,800 x 0.33 = 7,854 lb
A contractor will use a single-acting air hammer to drive concrete piles. If the pile
weighs 17,500 lb, what is the minimum weight that can be used? - Answers - 0.33 x
17,500 = 5,775 lb
A closed pile hammer in which steam/air/diesel explosion/etc. is used both to lift the ram
and to accelerate the down stroke. - Answers - Double-Acting Hammer
A supporting pile for a structure that can be of wood, concrete or steel in any number of
shapes and whose bearing is reached by point or end bearing, friction, or friction and
compaction, or a combination. - Answers - Bearing Pile
Pile driven until friction between pile surface and soil are great enough to support loads
placed on them. Used when firm bearing is too deep to provide support for an end
bearing pile. - Answers - Friction Pile
A pile that may form one of a continuous line or row of timber, precast concrete, or steel
piles driven interlocked to provide a tight wall to exclude or resist lateral pressure of
water, adjacent earth or other materials. - Answers - Sheet Pile
A pile that supports the major portion of the load placed upon it by end or tip bearing on
a firm stratum existing at some depth below the ground surface. - Answers - End
Bearing Pile
A pile made up of two or more types or sizes of piles joined together. The connection
between the components is designed to transmit load and to prevent separation during
and after construction. - Answers - Composite Piles
Piles formed by boring or other methods of excavation. H, open-end pipe and sheet
piles are considered low-displacement piles. - Answers - Non-Displacement Piles
A concrete pile either reinforced or prestressed which is manufactured in a construction
yard or at the site, and having been properly cured, is handled and driven like a steel or
timber pile. - Answers - Precast Pile
Pile driving leads attached to the boom point of the crane, with or without a spotter. Can
only be moved fore or aft for batter pile. - Answers - Fixed Leads
A structure of fabricated steel or wood in which or on which a pile hammer travels up
and down and with which the hammer and pile assembly are aligned in driving position.
A complete hammer support system including lead column, brace, and other
components. - Answers - Leads
A rolled-steel section with web and flanges nearly the same thickness. The width and
depth are approximately equal. Also called H-Beam. - Answers - Steel H-Pile
