TUNNEL TIMBERING UNIT AND STRUCTURE OF TUNNEL TIMBERING BODY

摘要

PROBLEM TO BE SOLVED: To provide a timbering body, which can constitute simple timbering structure corresponding to a ground section, in which the collapse, etc., of a bedrock are easy to be generated, in a tunnel excavating wall surface and by which the execution of works having excellent accuracy corresponding to the degree of curvature is carried out even to the excavating wall surface of a curved tunnel section. ;SOLUTION: A plurality of the timbering units A, in which collapse preventive members 3 are lined among the outer circumferential surfaces of front-rear arcuate steel materials 1, 2 curved in an arcuate shape along a tunnel excavating wall surface, are connected in the tunnel peripheral direction and the upper half section of the timbering body S timbering the upper peripheral section of the tunnel excavating wall surface, in which the collapse of a bedrock is easy to be generated, is constituted, and the lower half section of the timbering body S is configured by connecting sections among the front-rear arcuate steel materials 1, 2 by spacing members 9 and combining a plurality of the timbering units B, on which the collapse preventive member is not lined. The timbering bodies along the excavating wall surface of a curved tunnel section are executed by gradually narrowing width in the tunnel longitudinal direction among the front-rear arcuate steel materials 1, 2 organizing the lower half section of the timbering body towards lower sections.;COPYRIGHT: (C)2000,JPO