Manhole structure, flexible water shut off joint for manhole structure and method for installing manhole structure

摘要

There is provided a manhole structure 1 formed by joining a cast-in-place concrete manhole wall 2 to a pipe 3. In the manhole structure 1, the pipe 3 is driven and laid in a vertical shaft 4, and a flexible cut-off joint 5 for manhole is disposed on an outer periphery of the pipe 3. The flexible cut-off joint 5 for manhole comprises a rigid cylindrical body 6 and a tubular flexible body 7 located at an inside of the cylindrical body 6 in a space between the cylindrical body and the pipe, and the tubular flexible body 7 is made of an elastic body. An end 7a of the tubular flexible body 7 is press-fixed to an inner surface of the cylindrical body 6 with an expansion band 8, and the other end 7b of the tubular flexible body 7 is press-fixed to an outer periphery of the pipe 3 by tightening with a fastening band 9. The manhole wall 2 is formed by pouring a concrete on the outer periphery of the cylindrical body 6. The tubular flexible body 7 in the manhole structure 1 absorbs an expansion-contraction displacement, a bending displacement, a shearing displacement and the like between the manhole wall 2 and the pipe 3 without applying a load to the pipe 3.