ANCHOR DEVICE

PROBLEM TO BE SOLVED: To provide an anchor device capable of easily fixing an insertion member into a borehole even in a deep underground position by operation from the ground, obtaining fixing force of high strength based on mechanical or physical engagement, and easily coping with various changes in the bore diameter of the borehole. SOLUTION: The anchor device 20 inserted in the borehole 10 to fix the insertion member comprises an expansion rubber tube 22 radially expanded by a pressure fluid supplied inside; an anchor member 24 fixedly provided at the expansion rubber tube 22 and fixed into the borehole 10 by opening a plurality of claws 40 by expansion pressure with the expansion of the expansion rubber tube 22 to allow the tips of the claws 40 to bite into a hole wall; and a supply pipe 26 for supplying the pressure fluid into the expansion rubber tube 22. COPYRIGHT: (C)2007,JPO&INPIT