JPS6224672B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Industrial Application Field The present invention relates to a construction method for installing a new pipe in an existing pipe that is aging and has a curved pipe in the middle.

(2) Conventional technology When replacing old existing pipes with new pipes, shafts 2 and 3 are installed at both ends of the existing pipe line 1, as shown in Figure 1.
A construction method in which new pipes 5 are sequentially joined and installed inside the existing pipe 1 using a jack 4 installed in one of the shafts 2 or a winch (not shown) is referred to as a piping method within the existing pipe. Are known.

(3) Problems to be solved by the invention By the way, this construction method does not have any problems if the existing pipes are approximately straight, but as shown in Figure 2, if the existing pipes 1', 1 ``If the curved pipe 6 is formed in the middle, it will be impossible for the new pipe to pass through the curved pipe 6 section as described above, and if you try to implement the same construction method despite this, , a third shaft (not shown) must be installed in the 6th section of the curved pipeline. Therefore, if it is not possible to install a shaft in this section due to external factors such as traffic or housing conditions, this construction method may be used. I had the inconvenience of not being able to do that.

An object of the present invention is to provide a piping construction method within an existing pipe that can be implemented even if the existing pipe has a curved pipe as described above, and can eliminate the conventional inconveniences. .

(4) Means for Solving the Problems In order to achieve the above object, the present invention provides a piping construction method as described above, in which when the existing pipe is a curved pipe in the middle, it is possible to After forming a new curved pipe by inserting a short pipe or a curved pipe toward the curved pipe, new pipes are sequentially inserted from both shafts toward the new curved pipe while joining, and the beginning of the new pipe is inserted. This is characterized in that the tip end of the tube is fitted into the short tube or curved tube.

(5) Effects of the Invention Since the present invention is as described above, even if there is a curved pipe in the middle of the existing pipe, it is possible to insert and arrange a new pipe without the need to provide a shaft there. In addition to saving the construction costs required for installing a shaft, there is no environmental change caused by installing a shaft, and various troubles can be prevented, and it can be used in places where it is impossible to install a shaft. The effect is that it can be easily implemented.

(6) Examples Examples are shown from FIG. 2 onwards.

First, rust lumps in the existing pipes 1', 1'', and 6 are removed by appropriate means.

Thereafter, a curved pipe 7 having a bending degree corresponding to the curved pipe line 6 and having a short length is inserted from the shaft 2 or 3 toward the curved pipe line 6 and installed in the curved pipe line 6. In this case, if the degree of curvature of the curved pipe line 6 is large, the curved pipe 7 will be formed by joining a plurality of shorter curved pipes.

Next, the joint ring 8 is inserted into the existing pipe line 1'' from the shaft 3 and joined to the end of the bent pipe 7 to form a socket (Fig. 3).At this time, both socket pipes are used as the bent pipe 7. If used, there is no need to attach the connecting ring 8.

Next, as shown in FIG. 4, the new pipes 5 are successively joined using jacks 4 and inserted into the existing pipe 1' from the shaft 2 in exactly the same manner as before, and the tip of the leading pipe 9 is inserted into the existing pipe 1'. are inserted into the sockets at the opposite ends of the curved pipe 7 and joined (FIG. 5).

Next, as shown in FIG. 6, insert the new pipe 5' from the shaft 3 into the existing pipe line 1'' in exactly the same manner as described above, and fit the insertion opening at the tip of the leading pipe 9' into the joint ring 8. and join (Figure 7).

Fig. 8 shows a case where there are two curved pipes 6', 6'', and in this case, the straight pipe 1 in the middle has a length that can pass through the curved pipes 6', 6''. It is formed by inserting and joining a plurality of short tubes 10.

In the above example, the pipes installed within the existing pipes are all joined by fitting the sockets and sockets, which are commonly used in this type of pipe, so detailed explanations of the joints will be omitted. .

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a conventional curved piping construction method, Figs. 2 to 7 are sequential schematic explanatory diagrams of the construction method according to the present invention, and Fig. 8 is another construction method of the construction method according to the present invention. It is a schematic explanatory drawing of an example. 1, 1', 1'', 1...Existing pipe, 2, 3...
Vertical shaft, 5, 5'... new pipe, 6, 6', 6''... curved pipe, 7, 7'... curved pipe.

Claims (1)

[Claims] 1 In a piping construction method in which a vertical shaft that opens on the side of an existing pipe is provided at both ends of the pipe, and a new pipe is installed within the existing pipe using these two shafts, the pipe has a curved pipe in the middle. If so, insert a short pipe or curved pipe from one of the shafts toward the curved pipe to form a new curved pipe, and then sequentially insert new pipes from both shafts toward the new curved pipe. A piping construction method in an existing pipe, characterized in that the new pipe is inserted while being joined, and the tip end of the leading pipe of the new pipe is fitted and joined to the short pipe or curved pipe.