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

Abstract

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 7 a 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 7 b 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.

1 . A manhole structure comprising a manhole and a pipe joined thereto, in which the pipe is driven and laid in a vertical shaft, and a flexible cut-off joint for manhole structure is disposed on an outer periphery of the pipe, and the flexible cut-off joint for manhole structure comprises a rigid cylindrical body and a tubular flexible body located in a space between the cylindrical body and the pipe and at an inside of the cylindrical body, and the tubular flexible body is made of an elastic body absorbing a displacement between the cylindrical body and the pipe, and at least a part of the tubular flexible body is fixed to the cylindrical body and the pipe, respectively, and the outer periphery of the cylindrical body is fixed with a filler for manhole wall.  
   
   
       2 . A manhole structure according to  claim 1 , wherein said manhole is a cast-in-place concrete manhole, and a wall of said manhole is formed by pouring said filler for manhole wall.  
   
   
       3 . A manhole structure according to  claim 1 , wherein said manhole is a ready-made build-up manhole, and a drilled hole surface is provided on a wall of said manhole, and said filler for manhole wall is poured between an outer periphery of said cylindrical body and said drilled hole surface.  
   
   
       4 . A manhole structure according to  claim 1 , wherein said cylindrical body has a strip-shaped protrusion portion protruding toward a wall side of said manhole, and an end of said filler for manhole wall pored into the outer periphery of said cylindrical body is positioned by said protrusion portion.  
   
   
       5 . A manhole structure according to  claim 1 , wherein a flange is provided on an outer periphery of said cylindrical body.  
   
   
       6 . A manhole structure according to  claim 5 , wherein a non-curing butyl rubber adhering to said filler for manhole wall is attached to a face of said flange contacting with said filler for manhole wall.  
   
   
       7 . A manhole structure according to  claim 1 , wherein an end of said tubular flexible body is press-fixed to an inner surface of said cylindrical body with an expansion band, and the other end of said tubular flexible body is press-fixed to an outer periphery of said pipe by tightening with a fastening band.  
   
   
       8 . A flexible cut-off joint for manhole structure for joining a manhole to a pipe, in which said flexible cut-off joint for manhole comprises a rigid cylindrical body and a tubular flexible body located at an inside of said cylindrical body in a space between said cylindrical body and said pipe, and said tubular flexible body is made of an elastic body absorbing a displacement between said cylindrical body and said pipe, and at least a part of said tubular flexible body is fixed to said cylindrical body and said pipe, respectively, and when the manhole structure is formed, said pipe is driven and laid in a vertical shaft and said flexible cut-off joint for manhole is mounted on the outer periphery of said pipe and the outer periphery of said cylindrical body is fixed with a filler for manhole wall.  
   
   
       9 . A flexible cut-off joint for manhole structure according to  claim 8 , wherein an end of said tubular flexible body is press-fixed to an inner surface of said cylindrical body with an expansion band and the other end of said tubular flexible body is press-fixed to an outer periphery of said pipe by tightening with a fastening band.  
   
   
       10 . A method for the construction of a manhole structure by joining a manhole and a pipe, which comprises driving and laying said pipe in a vertical shaft, mounting a flexible cut-off joint for manhole structure on an outer periphery of said pipe in which said flexible cut-off joint for manhole structure comprises a rigid cylindrical body and a tubular flexible body located at an inside of said cylindrical body in a space between said cylindrical body and said pipe and said tubular flexible body is made of an elastic body absorbing a displacement between said cylindrical body and said pipe and at least a part of said tubular flexible body is fixed to said tubular body and said pipe, and pouring a filler for manhole wall into the outer periphery of said cylindrical body.  
   
   
       11 . A manhole structure according to  claim 2 , wherein said cylindrical body has a strip-shaped protrusion portion protruding toward a wall side of said manhole, and an end of said filler for manhole wall pored into the outer periphery of said cylindrical body is positioned by said protrusion portion.  
   
   
       12 . A manhole structure according to  claim 3 , wherein said cylindrical body has a strip-shaped protrusion portion protruding toward a wall side of said manhole, and an end of said filler for manhole wall pored into the outer periphery of said cylindrical body is positioned by said protrusion portion.  
   
   
       13 . A manhole structure according to  claim 2 , wherein a flange is provided on an outer periphery of said cylindrical body.  
   
   
       14 . A manhole structure according to  claim 3 , wherein a flange is provided on an outer periphery of said cylindrical body.  
   
   
       15 . A manhole structure according to  claim 4 , wherein a flange is provided on an outer periphery of said cylindrical body.  
   
   
       16 . A manhole structure according to  claim 2 , wherein an end of said tubular flexible body is press-fixed to an inner surface of said cylindrical body with an expansion band, and the other end of said tubular flexible body is press-fixed to an outer periphery of said pipe by tightening with a fastening band.  
   
   
       17 . A manhole structure according to  claim 3 , wherein an end of said tubular flexible body is press-fixed to an inner surface of said cylindrical body with an expansion band, and the other end of said tubular flexible body is press-fixed to an outer periphery of said pipe by tightening with a fastening band.  
   
   
       18 . A manhole structure according to  claim 4 , wherein an end of said tubular flexible body is press-fixed to an inner surface of said cylindrical body with an expansion band, and the other end of said tubular flexible body is press-fixed to an outer periphery of said pipe by tightening with a fastening band.  
   
   
       19 . A manhole structure according to  claim 5 , wherein an end of said tubular flexible body is press-fixed to an inner surface of said cylindrical body with an expansion band, and the other end of said tubular flexible body is press-fixed to an outer periphery of said pipe by tightening with a fastening band.  
   
   
       20 . A manhole structure according to  claim 6 , wherein an end of said tubular flexible body is press-fixed to an inner surface of said cylindrical body with an expansion band, and the other end of said tubular flexible body is press-fixed to an outer periphery of said pipe by tightening with a fastening band.