BOREHOLE BOTTOM GROUND PLATE LOAD TEST DEVICE AND METHOD FOR INSTALLING THE SAME

PROBLEM TO BE SOLVED: To efficiently perform a plate load test of ground in a hole bottom of a borehole with high accuracy by use of the borehole. SOLUTION: This borehole bottom ground plate load test device pressing the borehole bottom by a loading plate 11 and performing the plate load test of the hole bottom ground includes a loading part holding pipe 12 stored inside a test preparation hole in a state of holding a loading part comprising the loading plate 11 and a cylindrical part 15 at the lower end, for making a drilling machine drill a loading face of the loading plate 11 and arrive at a prescribed test ground face. The loading part holding pipe is formed with a spiral wing-shaped protrusion 13 on a side face, and the loading plate 11 is supported at the lower end of the loading part holding pipe 12 through a slit 14 of the cylindrical part 15. The loading plate 11 is synchronously rotatably supported in time of the drilling, and is supported movably only to a ground pressing direction to vertical direction loading by a loading rod 20 in time of the plate load test. COPYRIGHT: (C)2011,JPO&INPIT