Filling investigation of PC grout and sheath tube detection method at hole drilling for re-injection, filling investigation of PC grout and method of drilling hole for reinjection

摘要

PROBLEM TO BE SOLVED: To provide a sheath pipe detection method at the drilling of a PC grout reinjection hole which easily detects whether or not a drilled hole arrives at a sheath pipe without interrupting drilling work, and a drilling method of the PC grout reinjection hole which drills the PC grout reinjection hole at a PC construction without damaging a tendon which is inserted into the sheath pipe.SOLUTION: There is provided a sheath pipe detection method at the drilling of a PC grout reinjection hole which detects whether or not a drilled hole arrives at an external surface of a sheath pipe when drilling the hole for reinjecting PC grout therein at a PC construction X. The sheath pipe detection method feeds water to the hole which is drilled by a drill 2 via a water feed hose 41 by using a water feed/drain device 4 while drilling the PC construction X by the drill 2, drains and sucks the water together with dust which is generated by the drilling via a drain hose 42, and when a metal sensor 5 installed in the middle of the drain hose 42 detects metal, determines that the drilled hole arrives at the external surface of the sheath pipe.SELECTED DRAWING: Figure 1