The depth of water foundation board revised construction method

摘要

PROBLEM TO BE SOLVED: To provide a ground improvement method capable of constructing a block- shaped ground improvement body at high speed without causing environmental pollution in sea area or water basin. ;SOLUTION: A casing pipe 3 for bearing a hardener spouting pipe 4 having a monitor on the front end thereof on the center section with a centralizer is prepared. Then, the casing pipe 3 is conveyed to a specific position with a barge and is penetrated under the bottom of the sea with a vibro-hammer, a superhigh pressure jet J is jetted in the horizontal direction from the monitor on the front end of the hardener spouting pipe 4 at the same time as the penetration to cut earth and sand to move, the water level in the casing pipe 3 is lowered with difference in specific gravity between the inside and outside of the casing pipe 3, an air pipe and a discharge pipe are inserted into the casing pipe 3, compressed air A is jetted out from the air pipe to lead slime S to the inside of the exhaust pipe with an air-lift, the slime is sucked with a pump to discharge from the discharge pipe, the casing pipe 3 is pulled out up to specific length when it reaches specific depth, at the same time, the expansible hardener spouting pipe 4 is extend, and land formation is made with the superhigh pressure jet J, at the same time, to repeat the cycle for pulling out the casing pipe at specific speed to develop.;COPYRIGHT: (C)1997,JPO