| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground excavating method for constructing a shaft etc., which positively prevents the destruction of an excavated bottom surface by relatively simple excavated bottom surface stabilizing work without relying on a conventional groundwater level lowering method or a conventional base ground improving method, extremely reduced in adverse effect to a peripheral environment, and is carried out inexpensively, quickly, safely, and with reliability. SOLUTION: An earth retaining wall 1 formed of steel sheet piles etc. is set in the ground, the interior of the earth retaining wall 1 is excavated in water down to the excavated bottom surface 2, and placing temporary bottom slab concrete 3 is placed on the excavated bottom surface 2 in the ground. Then anchors 4 are driven into the excavated bottom surface 2 in the water, and strained to be settled to the temporary bottom slab concrete 3 in the ground. After settling the anchors 4, the water in the earth retaining wall 1 is drained to dry up the concrete, and water pressure acting on the lower surface of the temporary bottom slab concrete 3 is transmitted to the ground of an anchor settling portion by the anchors 4, to thereby prevent the destruction of the excavated bottom surface. COPYRIGHT: (C)2009,JPO&INPIT
|
