Title:
METHOD AND APPARATUS FOR REMOVING SUBMERGED PLATFORM
Document Type and Number:
Japanese Patent JPS63181808
Kind Code:
A
Abstract:
Disclosed is a method and apparatus for cutting piling and conductors extending into the sea floor from an offshore platform. A window is cut into the piling to permit access to the stabbing point which is then removed. The piling is washed out to remove sand and mud at least to the depth where the cut is to be made. A cutter/pinning device is lowered to the disired elevation of cut. Once the cutter/pinning device is properly positioned, engaging pistons are driven radially outward from the cutter/pinning device to engage the walls of the piling, preferably both above and below the line of cut. A series of radially disposed torches or explosives within the cutter/pinning device are then ignited to burn or blow a circumferential cut in the piling at the desired elevation of cut which will typically be twenty feet below the mud line. The support cable or tubing used to lower the cutter/pinning device is then withdrawn from the piling leaving the cutter/pinning device behind still engaging the piling both above and below the line of cut, thereby ensuring structural stability of the piling until it is desired to disassemble and remove the offshore platform.
Inventors:
PATORITSUKU MITSUSHIERU KENII
Application Number:
JP26152087A
Publication Date:
July 27, 1988
Filing Date:
October 16, 1987
Export Citation:
Assignee:
PATORITSUKU MITSUSHIERU KENII
International Classes:
E02B17/00; E02D9/04; E21B29/02; (IPC1-7): E02B17/00
Attorney, Agent or Firm:
Takayoshi Hayashi