| 摘要 |
PROBLEM TO BE SOLVED: To provide a water leakage countermeasure construction method for securely preventing a wall surface from being contaminated or frozen leaked water from disturbing traffic at a location at which water leakage from a lining surface of a tunnel constructed using a NATM construction method has been generated, by making the leaked water always flow in a lateral groove by using simple method while minimally restricting a roadway.SOLUTION: A water leakage countermeasure construction method for a tunnel constructed using a NATM construction method in which a waterproof sheet 5 is fitted to sprayed concrete 3's surface, a drainage material 6 is fitted to lower part of the waterproof sheet 5 along a direction of the tunnel 1 to drain water from the drainage material 6 to a central drainage outlet embedded under a roadway 7, and lining concrete 4 is fitted on the waterproof sheet 5's surface, includes the processes of: forming a base hole 13 on a footway 12's part on the lining concrete 4 side at a water leakage location of the tunnel; performing drilling diagonally downward from the base hole's bottom to the drainage material 6; connecting a water conduit pipe 18 from the base hole 13 to a lateral groove 16; and draining a flowing-in gush from the water conduit pipe 18 to the lateral groove 16 through an excavated hole 14 and the base hole 13.SELECTED DRAWING: Figure 5 |
