| 摘要 |
PROBLEM TO BE SOLVED: To cut off the transmission of ground strain to a tunnel by installing a material separable or slidable by the action of small shearing force between a silicone composition and a backfilling material on an outer peripheral surface of a segment in the segment arranged in a shield tunnel. SOLUTION: At earthquake time, since a boundary surface 4 between applied silicone composition 2 and backfilling material 3 having small sliding resistance is not adhered and a surface is smooth, a slide is generated on the boundary surface 4 in low friction. Since hydration reaction of cement is restrained in the boundary surface 4 with the silicone composition 2 since the silicone composition 2 is a water repellent material, sticking to concrete is eliminated, or even if there is sticking, the sticking is very weak, and even if the concrete is stuck once, there is a property of easily separating the silicone, composition 2 and the backfilling material 3 by permeation into the boundary surface 4 of underground water on the outer periphery. Thus, the edges of a shield tunnel and the ground are cut off at earthquake time to sharply reduce generating earthquake time cross-sectional force.
|
