| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide fittings for a non-blow construction method, its manufacturing method, and a branching structure and a branching method for an existing main pipe. <P>SOLUTION: In the fittings for the non-blow construction method which have an upper fitting and a lower fitting, a pipe is used for the trunk 2 of the upper fitting 1, and the trunk 4 of the lower fitting 3, semicircular openings 6 for inserting the main pipe are respectively arranged on the trunks 2, 4, and one end side of a half-cylindrical saddle member 9 formed by bending a metal plate is fixed by welding on the semicircular opening 6 of the trunk 2 of the upper fitting 1 and the semicircular opening 6 of the trunk 4 of the lower fitting 3. Further, the upper and lower fittings are produced by assembling the trunks 2, 4 made of the steel pipe and the saddle member 9 made by bending the metal plate. Furthermore, the branching structure and the branching method for a main pipe uses such the fittings. <P>COPYRIGHT: (C)2011,JPO&INPIT |
