TIMBERING STRUCTURE UNIT, TIMBERING STRUCTURE, AND PRIMARY LINING METHOD FOR TUNNEL PIT WALL

摘要

PROBLEM TO BE SOLVED: To provide the primary timbering excellent in the execution property and economical efficiency and easily change the primary timbering against the change of geology. ;SOLUTION: A frame body is formed with a pair of circular arc-like U-steels 2 facing each other and linear shape steels 3 connecting the end sections of the circular arc-like U-steels 2 together, and multiple reinforcing shape steels 4 and lattice-like flat bars 5 serving as a collapse preventing body of the natural ground are provided in the frame body to form a timbering structure unit 1. Fixing tools 6 for fixing the timbering structure unit 1 to the natural ground are provided in the frame body. Multiple timpering structure units are combined into a circular shape to form a timbering structure.;COPYRIGHT: (C)1997,JPO