Paralleling to the longitudinal direction of the tunnel at covering works concrete joint structure inside the tunnel, and the inner circumference

摘要

PPROBLEM TO BE SOLVED: To provide a lining concrete connecting structure in a tunnel, which protects a boundary area 18 from being damaged. PSOLUTION: In formation of the lining concrete connecting structure, first lining concrete 15 is poured into a first concrete pouring chamber with part of a shield plate 6 inserted in an end of the first concrete pouring chamber in the tunnel, and the part of the shield plate 6 is attached into an inner periphery of the first lining concrete 15 in one body by insert molding, followed by protruding a remaining part of the shield plate 6 outward from the inner periphery of the first lining concrete 15. Then second lining concrete 16 is poured into a second concrete pouring chamber with the remaining part of the shield plate 6 inserted in an end of the second concrete pouring chamber adjacent to the first lining concrete 15 along a tunnel longitudinal direction, and the remaining part of the shield plate 6 is attached into an inner periphery of the second lining concrete 16 in one body by insert molding. In this manner, the boundary portion 18 formed in the inner periphery between mutually opposed contact end faces 17a at a joining part 17 of the first lining concrete 15 and the second lining concrete 16, is covered with the shield plate 6. PCOPYRIGHT: (C)2007,JPO&INPIT