PROBLEM TO BE SOLVED: To provide a new and a reformed landslide prevention pile, a landslide prevention method and a construction method for the landslide prevention pile capable of speedily and simply improving a shear resistance of the ground to stabilize the ground.;SOLUTION: The present invention comprises: a pile main body 101 made by a steel pipe; a spiral blade 110 provided spirally at a tip of the pile main body or on a peripheral surface of the pile main body; and a bearing section 120 which is provided on the peripheral surface of the pile main body and is placed on a surface of a ground or embedded in the ground to generate a compressive force in the ground between the bearing section and the spiral blade. The pile main body has a plurality of through-holes that allows underground water to flow into an inside of the pile main body. The pile main body may allow the underground water to be discharged from the inside thereof to outside the ground.;COPYRIGHT: (C)2012,JPO&INPIT
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