PACKING FOR SEALING SHIELD PIT MOUTH, AND SHIELD PIT MOUTH SEALING STRUCTURE USING IT

摘要

PROBLEM TO BE SOLVED: To provide packing and a structure for sealing a shield pit mouth, which can maintain a sealing function even if the pressure of groundwater and sediment in a tunnel boring section is high.;SOLUTION: This packing comprises: a strip-shaped rubber member which has a predetermined width and a length almost equal to the length of an inner periphery of a tubular member 50, which is arranged along an inner peripheral surface of the tubular member 50, and which is expanded to the central side of the tubular member 50 by pressure water or pressure air, supplied from the side of the tubular member 50; a fiber-reinforced layer 54 which is embedded throughout a rubber member 52; mounting parts 53 and 53 which are provided at both the side ends of the rubber member 52, which are thicker than the rubber member 52, which are locked to a fixing member 58 provided in the tubular member 50, which are held in the state of being sandwiched between the fixing member 58 and the tubular member 50, and which are held in prescribed positions; and an anti-coming-off member 11 which has predetermined rigidity and strength, which is thicker than the rubber member 52, and which is embedded in the mounting part 53.;COPYRIGHT: (C)2006,JPO&NCIPI