CONSTRUCTION METHOD OF GROUND ANCHOR

PROBLEM TO BE SOLVED: To provide a construction method of a ground anchor forming the ground anchor of high quality capable of preventing the collapse of a hole wall in bedrock having greater cracking nature without letting grout flow into cracks and dispersing an anchor load. SOLUTION: The construction method of the ground anchor is so constituted that a ground anchor hole 2 is formed in the bedrock by a boring machine 7, the boring machine 7 is pulled out and a hole guard pipe 3 is inserted in the ground anchor hole 2, a tendon 11 and a plurality of bag bodies 4 provided so as to surround the tendon are inserted in the hole guard pipe 3 and that the ground anchor 1 is formed by filling the grout 5 in the bag bodies 4 while successively pulling out part of the hole guard pipe from the end of a fixed section 12 of the ground anchor 1. COPYRIGHT: (C)2004,JPO&NCIPI