MANHOLE STRUCTURE, FLEXIBLE WATER SHUT OFF JOINT FOR MANHOLE STRUCTURE AND METHOD FOR INSTALLING MANHOLE STRUCTURE

摘要

A manhole structure (1) formed by jointing a cast-in-place concrete manhole wall (2) with a pipe (3). In the manhole structure (1), the pipe (3) is laid by pipe-jacking in a vertical shaft (4) and a flexible water shut off joint (5) for manhole is provided on the outer circumference of the pipe (3). The flexible water shut off joint (5) for manhole comprises a rigid tubular body (6), and a flexible tubular body (7) located on the inside of the tubular body (6) in the space between the tubular body and the pipe, wherein the flexible tubular body (7) is formed of a resilient body. The flexible tubular body (7) has one end (7a) pressed fixedly against the inner surface of the tubular body (6) by means of an expansion band (8), and the other end (7b) pressed fixedly against the outer circumference of the pipe (3) by means of a tightening band (9). The manhole wall (2) is formed by pouring concrete to the outer circumference of the tubular body (6). The flexible tubular body (7) of the manhole structure (1) absorbs expansion/contraction displacement, bending displacement, shearing displacement, and the like, between the manhole wall (2) and the pipe (3) without applying any load to the pipe (3).