To provide a pit mouth sealing method and the device used upon start and arrival in an entrance device installed at the pit mouth upon start and arrival, which are particularly effective for water cut-off and seismic isolation of the entrance device.
In the sealing method of an entrance device to be installed at the pit mouth upon start and arrival, an elastic sealing material comprising a mixture of 100 pts.wt. of an isocyanate group-terminated urethane prepolymer, 50-200 pts.wt. of asphalt emulsion and 20-40 pts.wt. of cement is injected into a hollow part between a pit wall and a propulsion pipe and a hollow part between a ground improvement part and the propulsion pipe, or into an entrance packing tube. The device for carrying out this method is also provided.
YOSHITAKE MICHIO
SAMEZAWA HIROSHI
DAI ICHI KOGYO SEIYAKU CO LTD
TOA DORO KOGYO CO LTD
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