Memorandum
TO:
FROM:
DATE:
SUBJECT: Specifications for Pile Hammer
1. Pile hammers used to install cylinder piles shall be capable of developing a rated energy per blow of no less than 122,000 joules (90,000 foot-pounds). The hammer shall have a minimum ram weight of 27,215 kilograms (65,000 pounds) and an adjustable stroke.
2. The hammer shall be equipped with a capblock composed of alternating layers of aluminum and Micarta plates. The layers will cushion the blow of the ram on the follower.
3. Followers shall cover the entire head of the cylinder pile, maintaining concentricity between the hammer and pile, efficiently transmitting blow energy from hammer to pile, and enclosing an acceptable wood cushion to protect the head of the pile during driving.
4. A wood cushion block at least 152mm (6 inches) thick shall be used on the head of the pile to distribute the hammer-to-blow energy uniformly. The cushion block shall be composed of layers of 19mm-thick plywood or an acceptable alternate as approved by the designer. The dimension shall be such as to cover completely the concrete cross section of the pile.
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