GROUND ANCHOR WORK USING BELLMOUTHED PIPE, AND BELLMOUTHED PIPE

摘要

PROBLEM TO BE SOLVED: To eliminate a structural defect of the conventional grout anchor work with which a prestress given to a head portion of an anchor affects a grout material invaded into a portion to be compressed thereby creating no compressed area in an unstable layer. SOLUTION: The grout material is placed under pressure to a casing pipe and an anchor body is formed in the bed rock, then a bellmouthed pipe comprising a pipe portion and an enlarged diameter portion is inserted to the casing pipe and the grout material between the casing pipe and the bellmouthed pipe is discharged through the pipe portion.