Imai Minoru

TL;DR: In this article, the authors proposed to construct a tunnel having a larger section at a low cost with small diameter shield machines by inserting gradually preliminary small diameter tunnel structures provided to the outside thereof in advance to widen a diameter after formation spaces of a series of the small-diameter tunnel structures of which a tunnel structure is constituted are gradually widened at specific positions.

TL;DR: In this article, a large number of extra small tunnel structures 4, 4... are connected to each other, and courses of tunnels T1 and T2 constituted of tunnel structural bodies 2A and 2B forming tunnel spaces 3A and 3B against earth pressure of a bedroc are modified to be finally converged with the axes of tunnels approaching gradually to each another.

TL;DR: In this paper, a check valve 60 provided on a main wall frame or an auxiliary wall frame is opened, and the material is supplied between forms and the natural ground through the check valve.

TL;DR: In this paper, a water cut-off material 30 which expands and blocks a clearance in a boundary K when it contacts water, is placed continuously along the longitudinal direction of a tunnel to be built in the boundary K of the covering bodies 9 of the small-bore shield tunnels 4 in the superposed parts.

TL;DR: In this paper, a plurality of slope protection blocks 3 are assembled on a slope 1 and vegetation zones 4 are formed there between, where a specified thick soil layer 12 containing clay is formed so as not to allow rooting plants S on the slope 1, and a surface soil layer 13 to allow root the plants S is formed on the soil layer 6.