WATER SUPPLY/DRAINAGE APPARATUS FOR WATER SEALING BOREHOLE

PROBLEM TO BE SOLVED: To provide a water supply/drainage apparats for a water sealing borehole which apparats facilitates work of inserting a packer hose into the borehole to locate the packer hose at a target position 3 to 4 meters away from an opening of a water sealing tunnel or a position close to the target position and sealing up the water sealing borehole. SOLUTION: According to the water supply/drainage apparats 16 with the packer hose 18 for the water sealing borehole 12, an external drainage pipe 50 is of a divided structure consisting of a fixed pipe 50A in the packer hose 18 and an extension pipe 50B outside the packer hose 18 that are connected to each other. An internal pipe is not fixed to the packer hose 18, and an extension portion of the internal pipe outside the packer hose 18 is connected/fixed to an end of the extension pipe 50B of the external pipe 50. COPYRIGHT: (C)2010,JPO&INPIT