From inside the pipe conduit under the cable site is used for manner and this manner which it projects installs the welding ground stick the welding ground stick

摘要

PURPOSE: To eliminate a ground improvement and to reduce the working process to shorten the process and to reduce the cost, and to improve the earthing efficiency of the earth rod, by inserting directly an earth rod from a grout pouring hole of an underground duct for a cable, and burying the earth rod as is. ;CONSTITUTION: After a grout pouring hole 17 is provided on the wall surface 7 of a duct, an earth rod 6 is penetrated in by the rotation, the press-in, or the impact of the earth rod 6 by using a boring machine, while excavating the ground by the earth rod 6 installing a bit 2 and a tip device from the above grout pouring hole 17. And the earth rod 6 is buried as is, a grout pouring by a filler material in the clearance between the earth rod 6 and the grout pouring hole 17 periphery, and a hollow inside the earth rod 6, is carried out, and the a rod surface 3 and a lead wire are connected electrically through an earth wire connecting metal, so as to earth the lead wire. A swivel 14 may be used concurrently in some occasion.;COPYRIGHT: (C)1996,JPO