AIR VENT/WATER CUT-OFF DEVICE FOR TUNNEL AND TUNNEL CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an air vent/water cut-off device which can easily suck out the air between waterproof sheets and back-filling materials of a tunnel, and which can simply and reliably do cut-off of water.;SOLUTION: Waterproof sheets 5 are stretched along a primary lining 3 of a tunnel 1. An air vent member 11 of an air vent/water cut-off device 10 is provided on impermeable sheet materials 5a of the waterproof sheet 5. A space between the impermeable sheet materials 5a and the air vent member 11 is liquid-tightly sealed by sealing means 30. An air vent passage 12a penetrating the impermeable sheet material 5a is formed in the air vent member 11. By placing a secondary lining 6, the air between the impermeable sheet material 5a and a water permeable sheet material 5b is discharged from the air vent passage 12a. Thereafter, a closing member 20 is attached to the air vent member 11, and the air vent passage 12a is liquid-tightly closed.;SELECTED DRAWING: Figure 6;COPYRIGHT: (C)2018,JPO&INPIT