| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint of a precast member enabling the manufacture of a female joint having an annular groove and an annular spring and the mass-production of small size joints at low cost even in a small size joint of a small size precast member such as a small diameter segment for tunnel lining and also provide a precast member having the joint. SOLUTION: A female joint 21 is divided into a discoid head body 31 and an anchor bar 32. The head body and the anchor body are separately manufactured, and combined with each other to form the male joint 21. An enlarged hole 33 is formed in the head body 31, and a cut annular groove 24 is made shallow by the enlarged hole 33 so that the annular groove can be cut with a cutting blade having a short edge. Therefore, a small size female joint 21 with a small groove width can be massproduced. The enlarged hole 33 is used as a mounting hole for the anchor body 32. The end of the anchor body 32 is inserted into the enlarged hole 33, and the anchor body is formed integrally with the enlarged hole by welding or screwing. Consequently, the annular groove 24 with a small width and a large depth is formed by the shallow bottom part groove 24a of the head body 31 and the front end surface 24b of the anchor body 32. COPYRIGHT: (C)2009,JPO&INPIT
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