| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent separation and falling-off of a joint material from a ring-shaped clearance by inserting a spiral reinforcement in a ring shape into an inside part of the ring-shaped clearance formed between a side surface hole of a manhole and a main pipe fitted in this side surface hole, and forming an inside joint by filling the joint material so as to be entangled with this spiral reinforcement. SOLUTION: Metallic wires covered with synthetic resin are wound in a spiral shape, and are juxtaposed in large numbers so that circular parts 6a and small circular parts 6b alternate with each other, and a tightening wire 8 is inserted into the respective small circular parts 6b, and a spiral reinforcement is formed. This spiral reinforcement is bent in a ring shape by putting this tightening wire 8 on the inside, and is inserted into an inside part of a ring-shaped clearance 4 formed between a side surface hole 2 of a manhole 1 and a main pipe 3, and the tightening wire 8 is tightened along an outside surface of the main pipe 3, and both ends are mutually twisted and fastened together (8a), and the total length of the tightening wire 8 is also adhered to an outside surface of the main pipe 3. Next, a joint material 5a such as cement mortar mixed with resin is filled in an inside part of the ring-shaped clearance 4 while entangling it with the spiral reinforcement, and an inside joint 5 to block up the ring-shaped clearance 4 is formed.</p> |
