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Transportation Curriculum Coordination Council |
Cushions are used to protect both the hammer and the pile. Cushions that protect the hammer are called capblock cushions or hammer cushions. Cushions used to protect the pile are called pile cushions.
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Hammer cushions are constructed of man-made materials that are heat resistant, durable and absorb a certain amount of shock. Common types of materials are aluminum, micarta and polymer which are in the form of disks. Aluminum is usually 1/2 inch thick. Micarta is usually 1 inch thick and are used in sandwich form. Polymer is typically used alone. Another less common hammer cushion material is Hamortex
Hammer cushions are located between the point of the ram or anvil and the pile cap.
Hammer cushion set in pile cap.
This picture shows some different types of cushions.
Pile cushions are placed between the pile top and the pile cap on concrete piles. Pile cushions are not used on steel piles or timber piles. Pile cushions consist of plywood. Pile cushions are generally replaced for each pile or as directed by the Engineer.
Pile cushions are located between the top of the pile and the bottom of the pile cap.
Typical plywood pile cushion.
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