SEALING METHOD FOR SHAFT ARRIVAL OF SHIELD MACHINE AND ITS DEVICE

摘要

PROBLEM TO BE SOLVED: To safely construct a tunnel having large depth surely. SOLUTION: An entrance chamber 4 hermetically sealed on the inner circumferential surface of a shaft wall 8 for arrival is formed, the entrance chamber is filled with fillers 5 and a shield machine 12 completely constructing the tunnel 10 is penetrated into the entrance chamber in the excavation of the shaft wall, a cleaning liquid is injected, excavating the fillers in the entrance chamber by the shield machine and the muddy water is discharged outside the entrance chamber, an expansion-contraction sealing member 6 installed on the inner circumferential surfaced of the entrance chamber is bulged and press-contacted with the outer circumferential surface 12b of the tunnel boring machine, and a sealing material such as mortar is injected onto the outer circumferential surface of the tunnel boring machine on the rear side of the expansion- contraction sealing member and the opening of the shaft wall and the internal space of the entrance chamber are sealed hermetically.