SOUNDNESS INSPECTION METHOD FOR GROUT MATERIAL IN UNDERGROUND ANCHOR CONSTRUCTION

PROBLEM TO BE SOLVED: To improve quality of an underground anchor, reduce a construction period, and reduce the cost by preliminarily inspecting development modes for a charged zone, a non-charged zone, a non-hardened zone by effects of pressurized water (spring water), etc., for grout material to be easily recognized. SOLUTION: In an anchor construction method, a hole is bored in the ground 1, and insertion of an anchor body 10 and injection of grout material G are performed to the hole 2, so the anchor body 10 is fixed to the ground 1 by hardening of the grout material G. In this case, before or immediately after injection of the grout material G, a sensor cord 20 for detecting the grout material G is disposed along the whole length of it, and soundness of development modes of a non-charged zone, a non-hardened zone, etc., for the grout material is inspected based on detection signals obtained through the sensor cord 20.