WATER CUT-OFF CONSTRUCTION FOR ALREADY CONSTRUCTED MULTIPLE HOLE ELECTRIC POWER CONDUIT

摘要

PURPOSE:To provide a water cut-off construction method for an already constructed multihole electric power conduit which is constructed so that the time necessary for the pouring charge of the grout material into the inundation part in a through hole can be shorten, and the grout material having a short usable time, i.e., the so-called instant solidification performance can be used, and the effluence of the grout material to the underground water is prevented. CONSTITUTION:A packer has the packer parts 8a and 8b which are spread and contracted and a pouring inlet 10 for the grout material in the intermediate shaft part between both the packer parts, and shift and stop are repeated in the state where the packer 6 is installed in shiftable manner in a through hole under the remote operation, and at each stop position, both the front and rear packer parts 8a and 8b are spread. After the part between both the packers is left in a limited space formation state, one packer part is contrtacted, and the limited space is released, in order to judge the existence of the inundation port, by confirming the flow-out quantity from the inside of the limited space. If the existence inundation is judged, both the packer parts 8a and 8b are returned to a spread state again, and the grout material is poured into the inundation part through the limited space from the injection port of the intermediate shaft part 9.