Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1976-05-17
1978-02-28
Shapiro, Jacob
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
173125, 173131, 173DIG1, E02D 710
Patent
active
040758583
ABSTRACT:
An apparatus and a method for driving piles onshore or offshore, including driving a tubular pile within a submersed tubular jacket leg of an offshore structure and field disassembly.
The apparatus hammer includes a displaceable ram structure, mounted within a pressurized air-filled housing, which is reciprocated by a pressurized working liquid against a pile-engaging anvil structure, which is in dry contact with a pile inserted within one end of the pressurized housing. The ram structure compresses air within the housing near the end of its firing stroke to preload the anvil structure for better energy transfer to the pile. The ram structure also compresses the air within the housing near the end of its loading stroke to slow the ram structure and permit full charging of working liquid accumulators, which discharge during the firing stroke to maintain working liquid pressure and prevent cavitation.
Pressurized working liquid and air are supplied to the hammer from a rotatable and longitudinally displaceable platform having an extendible mounting spider structure for mounting to an offshore structure and including hoist means for inserting and positioning the hammer within a jacket leg.
Alternately, the pressurized working liquid system can be self-contained in the hammer by mounting electrically-driven hydraulic pumps in the hammer.
The hammer structure includes a packing gland capable of withstanding high impact loads, which is locked into place by a locking taper joint, and which is easily removed by sequential and selective application of heat and cold.
REFERENCES:
patent: 3817335 (1974-06-01), Chelminski
patent: 3881557 (1975-05-01), Gendron et al.
patent: 3939922 (1976-02-01), Swenson
patent: 3958647 (1976-05-01), Chelminski
Greigg Edwin E.
Shapiro Jacob
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