LIQUEFACTION COUNTERMEASURE DEVICE

PROBLEM TO BE SOLVED: To provide a liquefaction countermeasure device capable of reliably exerting a liquefaction prevention effect regardless of lapse time after installation thereof and alleviating a liquefaction phenomenon by immediately getting a liquefiable layer unsaturated when an earthquake occurs.SOLUTION: A liquefaction countermeasure device comprises: an embedded pipe 1 with water permeability; an expanding member 2 which is installed inside the embedded pipe 1 and elastically expanded with gas encapsulated in the expanding member 2; earthquake detection means 3 which detects an earthquake; and fracturing means 4 which immediately fractures the expanding member 2 when the earthquake detection means 3 detects the earthquake with a magnitude enough to cause liquefaction. The liquefaction countermeasure device can alleviate a liquefaction phenomenon, when the earthquake with the magnitude enough to cause the liquefaction occurs, by instantaneously fracturing the expansion member 2 with the fracturing means, taking pore water in the embedded pipe and getting soil around the embedded pipe unsaturated.