METHOD FOR REMOVING FILLED SAND AND POWER CABLE IN SUBTERRANEAN BURIED TROUGH, METHOD FOR REGENERATING TROUGH AND FOR FILLING HOLLOW PORTION

PROBLEM TO BE SOLVED: To provide a method for removing filled sand and a power cable in a subterranean buried trough, a method for regenerating the trough, and for filling a hollow portion for removing the power cable and the filled sand in the trough, filling fluidized treated sand in the hollow portion of the trough to be returned or renewed, capable of reducing the number of digging portions thus shortening a construction period, and restraining the generation of construction scraps. SOLUTION: Vertical shafts 1 for working are dug out of the ground surface at both ends of certain lengths of the trough 2 in which the power cable 3 is buried. In the shaft 1 for working, both ends of the power cable 3 to be removed are cut, the filled sand 4 in the trough 2 between the vertical shafts 1 is loosened by injecting high pressure water to the filled sand 4 from one end of the trough 2 to flow into the vertical shaft 1 from the trough 2 together with the exhaust water, the filled sand 4 mixed in the water in the vertical shaft 1 is sucked to be discharged to the ground, the power cable 3 in the trough 2 is pulled out of the vertical shaft 1 on one end, and the fluidized treated sand is filled in the trough 2. COPYRIGHT: (C)2006,JPO&NCIPI