| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a compact boring apparatus capable of making an airtightness test after boring, and a supply pipe installation method for laying a supply pipe in a prescribed position in a non-open-cutting and space-saving manner in a short construction period. <P>SOLUTION: This boring apparatus has a cylindrical body 15 comprising a cutting edge part 15a with the tip formed in wedge shape, and a connection part 15b larger in diameter than the cutting edge part; a boring cutter 14 having an O-ring 16 held to the outer peripheral surface of the cutting edge part 15a; and a flexible rod member 17 connected to the rear part of the cutter 14. In the supply pipe installation method for burying the supply pipe 8 branched from a main support pipe 2 buried underground, to supply gas to consumers, without open-cutting, a vertical hole 3 is excavated from the ground surface toward the main support pipe 2, and a flexible shield tube 6 is allowed to reach the vertical hole from the consumer side. A joint 9 stuck to the tip of the supply pipe 8 gripped by a support member 5c is joined to the main support pipe 2, and the main support pipe 2 is bored by the boring apparatus 13 to communicate the main support pipe 2 with the supply pipe 8. After making the airtightness test, the flexible shield tube 6 is pulled out to backfill the vertical hole 3 and the periphery of the supply pipe 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
