| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for connecting a branch pipe to an underground pipe capable of surely providing seismic function as a connection structure of the underground main pipe and the branch pipe, and its connection structure. <P>SOLUTION: A connection pipe comprise a connection pipe main body formed in a cylindrical shape and having flexibility with a spiral groove formed on an outer circumference surface in a bellows shape; a lower connection member connected to an attachment pipe main body and an upper connection member connected to the branch pipe; a coil spring shape reinforcement member arranged at an outer circumference side of the connection pipe main body with fitted to the spiral groove; and a cover pipe arranged to cover an outer circumference of the reinforcement member, and is made to function as a seismic joint. Filler has clay cement as main material, has normal cement and fiber binder mixed, and is kneaded with water. The filler is filled in a part between a connection hole and the attachment pipe main body under a condition where a jacking pipe is raised up near to an upper end part of the connection pipe. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
