| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a ground reinforcement method capable of easily and efficiently constructing a cast-in-place pile with stable quality at low cost without causing material separation in the concrete while producing little surplus soil.SOLUTION: In order to construct a cast-in-place pile, the ground reinforcement method uses: a casing 10 of a length H/2 which is generally a half of a pile construction depth H; a front end drilling blade 2 which is detachably attached to the front end of the casing; and an attachment 9 which is attached to the top end of the casing. After the front end drilling blade is attached to the casing at the lower end thereof, the casing is driven to insert into the ground by approximately depth of H/2. After injecting an injection material inside the casing, the attachment is connected to the casing, and the casing connected with the attachment is driven to insert into the ground by the pile construction depth H. The casing with the attachment connected thereto is pulled up until the lower end of the casing gets closer to the upper end of the injection material (in this case, the front end drilling blade is left at the bottom of the pile). After removing the attachment from the casing, the injection material is injected inside the casing again. Finally, the casing is pulled out.</p> |
