| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely prevent water from leaking into a pipe through the interior of a check valve and between the check valve and a hole thereof by a method wherein a check valve for injecting grout to the outside of a pipe is inserted into a hole formed through the wall of a pipe for a pipe jacking method and the valve is screwed into the hole from inside the pipe, and a water sealing plug is provided to compress a sealing material between the inner periphery of the hole provided on the inner side of the pipe with respect to the check valve and the water sealing plug. SOLUTION: An inner peripheral smooth part 31, in which no internal thread is formed, is provided in a part of a pipe inside a check valve 16 provided in a hole 13. The forward end of a water sealing plug 21 is formed so as to have a protruding shape in its cross section and a notch 33 is formed in the outer periphery of the plug 21. The plug 21 is screwed into the hole 13 to compress an O-ring 22 mounted in the notch 33 between the surface of the notch 33 and the smooth part 31 of the hole 13. The plug 21 also is screwed so as to make contact with a protrusion 32 constituting the part 31, whereby the plug 21 is positioned.</p> |
