| 摘要 |
PROBLEM TO BE SOLVED: To prevent liquefaction of the ground by quickly dissipating excessive pore water pressure generated by an earthquake; to form the further stable ground by increasing ground density at construction work; and to promote a countermeasure against liquefaction and consolidation of the weak viscous soil ground in response to the various grounds alternately overlapped and deposited with a loose sandy soil layer and a weak viscous soil layer. SOLUTION: In this drain placing construction method, a hole is excavated by inserting a casing 8 into the ground by using a construction machine 6 for building up the casing, and a drain material 1 connected in the optional length is inserted into the built-up casing 8 by installing a filter around a cylindrical drain material 2 of superposing a linear synthetic resin, and afterwards, the casing 8 is extracted, and this drain material 1 is left in the ground. Vibration is applied to the casing 8 at extracting time. COPYRIGHT: (C)2004,JPO
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