| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquefaction prevention construction method to be executed for preventing the liquefaction of ground in the case that ground directly under an existing building includes what is called a liquefied layer such as sandy ground, etc. and that it can be liquefied at the time of an earthquake, etc. SOLUTION: A soil cement enclosure wall 2 is constructed in the ground of an outer circumferential part of the existing building 1 by a mixing method in such a way as to be approximately vertically passed through the liquefied layer 3 to a depth reaching a non-liquefied layer 4 under it and in such a blocking form as to surround and restrict the liquefied layer 3 of the ground directly under the existing building 1 when planarly viewed. As a soil cement wall by a mixing method using a tilt-type soil improvement construction machine 8, a continuous tilted wall 5 having a triangular shape in a vertical outline, continuous in the same direction as the outer-circumferential soil cement enclosure wall 2, and structurally integrated with the outer-circumferential soil cement enclosure wall 2 is further constructed in the inner surface of the outer-circumferential soil cement enclosure wall 2 in such a way as to be passed through the liquefied layer 3 from a crest section of the outer-circumferential soil cement enclosure wall 2 to a depth reaching the non-liquefied layer 4 under it. COPYRIGHT: (C)2009,JPO&INPIT
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