CYLINDRICAL WALL BODY FOR LINING OF EXCAVATED HOLE

摘要

PURPOSE:To increase coupling strength of a segment and to improve stability of a cylindrical wall body by a method wherein the arcuate plateform segments of a main wall part are coupled with recessed part and protrusion parts formed during intercoupling of two adjoining branch part segments. CONSTITUTION:A rectangular mating half part having width half the width of a branch part segment 10 is arranged from the one side surface side to the one end in a dogleg longitudinal direction of the segment 10 in a rectangular shape ion a plane and approximately in a -shape in cross section. A similar mating half part is arranged to the other end from the side surface side reverse to the one side surface side, and when the side surfaces of two adjoining branch part segments 10 are coupled to each other, the mating half parts are positioned facing each other to form a recessed part 19 and a protrusion part 20. Arcuate plateform segments 4 with which a main wall parts 1a and 1b are formed are coupled to the recessed parts 19 and the protrusion ports 20, and the arcuate plateform segments 4 are incorporated in a meandering shape to improve cou pling strength.