Manhole structure constructing method, manhole structure water-stop flexible joint and manhole structure

Abstract

A method is disclosed for constructing a manhole structure in which a manhole and a pipe are joined together by using a waterproof flexible joint. The joint includes a rigid cylindrical portion and a cylindrical flexible portion that has a covering portion to be fixed around an outer periphery of said pipe, a fixing portion fixed to an outer periphery of said rigid cylindrical portion and to be fixed to the manhole and a connecting portion connecting the covering portion to the fixing portion and made of an elastic material being capable of absorbing a displacement between the manhole and the pipe. The waterproof flexible joint is located around the outer periphery of the pipe, and the covering portion is fixed around the outer periphery of the pipe. Then, a filler for the manhole is poured around an outer periphery of the fixing portion.

What is claimed is:  
     
         1 . A method for constructing a manhole structure in which a manhole and a pipe are joined together, said method comprising: 
 preparing a waterproof flexible joint for the manhole structure, said waterproof flexible joint comprising a rigid cylindrical portion and a cylindrical flexible portion, said cylindrical flexible portion comprising a covering portion to be fixed around an outer periphery of said pipe, a fixing portion to be fixed to said manhole and a connecting portion connecting the covering portion to the fixing portion, said fixing portion being fixed to an outer periphery of said rigid cylindrical portion, said connecting portion being made of an elastic material being capable of absorbing a displacement between the manhole and the pipe;    locating the waterproof flexible joint around the outer periphery of the pipe;    fixing the covering portion around the outer periphery of the pipe; and    pouring a filler for the manhole around an outer periphery of the fixing portion.    
     
     
         2 . The constructing method set forth in  claim 2 , wherein said manhole is a concrete manhole cast on site, said manhole is constructed by said filler.  
     
     
         3 . The constructing method set forth in claim, wherein said manhole is a make-up constructed manhole, a hole is formed in a peripheral wall of the manhole, and said filler is poured into a space between the outer periphery of the fixing portion and a face of the hole.  
     
     
         4 . The constructing method set forth in any one of  claims 1  to  3 , wherein said fixing portion has a jaw portion, and said jaw portion bites into the manhole.  
     
     
         5 . A waterproof flexible joint for use in a manhole structure, said joint being adapted to join a manhole and a pipe and comprising a rigid cylindrical portion and a cylindrical flexible portion, said cylindrical flexible portion comprising a covering portion to be fixed around an outer periphery of said pipe, a fixing portion to be fixed to said manhole and a connecting portion connecting the covering portion to the fixing portion, said fixing portion being fixed to an outer periphery of said rigid cylindrical portion, said connecting portion being made of an elastic material being capable of absorbing a displacement between the manhole and the pipe, the manhole being constructed by pouring a manhole filler around the outer periphery of the filing portion.  
     
     
         6 . A manhole structure constructed by the method according to any one of  claims 1  to  4 , said manhole structure comprising a manhole and a pipe joined together.  
     
     
         7 . A manhole structure comprising a manhole, a pipe and a waterproof flexible joint for the manhole structure, the manhole and the pipe being joined together by the waterproof flexible joint, said joint being adapted to join a manhole and a pipe and comprising a rigid cylindrical portion and a cylindrical flexible portion, said cylindrical flexible portion comprising a covering portion to be fixed around an outer periphery of said pipe, a fixing portion to be fixed to said manhole and a connecting portion connecting the covering portion to the fixing portion, said fixing portion being fixed to an outer periphery of said rigid cylindrical portion, said connecting portion being made of an elastic material being capable of absorbing a displacement between the manhole and the pipe, said covering portion being fixed to an outer periphery of said pipe, and a filler for the manhole being poured around said fixing portion.