JPS5824678A - Method of piping bend section in piping in existing duct - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of piping by inserting a new pipe into an existing pipe, and particularly to a method of piping in a curved pipe portion of an existing pipe.

4.Replacing aging existing pipelines with new pipes, cutting new underground pipes or digging tunnels will save a lot of construction costs, and the diameter of the pipes will be slightly smaller.

The conventional method for piping is to insert a new pipe into the existing pipe. However, in the case of Jin's piping method, if there was a curved pipe in the existing pipe, piping could not be done in the past, and the ζ0 part had to be laid using an open-cut method or the like.

SUMMARY OF THE INVENTION An object of the present invention is to enable piping to be performed using a new pipe inserted even in a curved pipe section of an existing pipe line.

The present invention involves inserting a required number of short pipes, each of which has at least one end cut off on a virtual plane inclined with respect to a virtual plane perpendicular to the pipe axis, into an existing pipe in advance of the straight pipe. After the pipe reaches the bent pipe part of the existing pipe, each short pipe O around the pipe axis] O
The pipes f@ are butted against each other while adjusting the positions m to form a curved pipe line that is curved corresponding to the curved pipe part of the existing pipe line, and the matched short pipes are joined together.

Hereinafter, one embodiment of the present invention will be described based on the drawings.
In Figure 1, (1) is the existing pipe, (1m) is the straight pipe part, (tb) is the bent pipe part, and there is a relatively small gap t-S in the existing pipe (1). & Pipeline (2) has been laid. U existing pipe 0rJi, pipe 11fs(la)K
Corresponding straight pipe line (2 pipes) of new pipe line Q)
The curved pipe section (1) of the above-mentioned R-shaped pipe is laid by joining three pipes, and the corresponding curved pipe (gb) is symmetrical with respect to a virtual plane perpendicular to the pipe axis. It is constructed by joining a plurality of nine short pipes (4) cut by a pair of virtual planes inclined at 111 g.

Figure 1 shows the case where the curved pipe section (1 m) of the existing pipeline is bent in an arc shape, but as shown in Figure 2,
Even when the pipe is bent in a letter shape, the bent pipe (2b) corresponding to the O-bent pipe part (lb) can be constructed by suitably adjusting the position of the short pipe (4) around the pipe axis and joining it. .

As for the piping procedure, the straight pipe 1is (la
) C) Dig a vertical shaft at an appropriate location and connect the existing pipe (
1) Insert a new tube inside. These vertical shafts are formed on both sides of the curved pipe section (1b), and new pipes are installed from these vertical shafts into each curved pipe section (1b).
It is inserted toward the section (1k). In other words, when inserting a new pipe from a shaft into an existing pipe (υ), there must not be multiple vertical shafts and Ot [K bent pipes 5 (in).
When there is a curved pipe section (lb) in front of it, as shown in FIG.
IZ) [V (4) t, K'lli &<2 ward) t1
4 straight straight pipes <3)! Insert it in advance of Ic. At this time, all of the short pipes (4) may be inserted from one of the vertical shafts, or an appropriate number may be inserted from the vertical shafts on both sides. When the tube axes reach the position, the positions of the pipe axes are mutually adjusted so that the pipe fittings butt up, and the orchid is aligned in accordance with the curved pipe section (lb) of the existing pipe as shown in Figures 1 and 2. The piping in the curved pipe section (1k) is completed by constructing a nine-curve pipe (2b) and then joining the pipe fittings together. The piping in the straight pipe W (IIL) is completed by joining the straight pipes (3) through suitable pipe joints.The joint structure of the short pipes (4) is as shown in Fig. 4. , 40 was conceived in which seven inner flange (5) were provided protruding from the inner periphery of both ends of the short pipe (4), and the inner seven flange (5) facing each other were fastened from inside the pipe with bolts and nuts (6). It will be done. Sealing performance is ensured by inserting a gasket between the inner 7 langes (5) or by forming an annular groove on one side and attaching a rubber ring to this to create a metal touch type 07 lange joint. can do. In addition to the short tube (4) having both end faces sloped, it is also possible to use a short pipe (4) having only one end face sloped as shown in FIG.

According to the method of the present invention, as is clear from the above explanation, a nine-short pipe with at least one end surface being inclined is inserted into the existing pipe in advance of the straight pipe, and the above-mentioned By adjusting the position of the pipe axis of the short pipe, a curved pipe line corresponding to this bent pipe part is constructed, and by joining these short pipes together, the bent pipe part can be formed within the existing pipe pipe. 1* new pipeline can be installed.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 are schematic diagrams of the newly constructed pipes laid (by the method of the present invention), Fig. 8 is an explanatory diagram showing the process of inserting short pipes and straight pipes, and Fig. 4 is a short pipe O. FIG. 5 is a schematic vertical sectional view showing the joint structure, and a side view showing another example of the short pipe. (1) - Existing pipe, 01) - Straight pipe, (1k) - Bent pipe, (2 new pipe, (c) - Straight pipe, (2b) - Curved pipe, (j) - Straight pipe, (4) - Short pipe agent Yoshihiro Morimoto Figure 1 Figure 2

Claims (1)

[Claims] L Insert a tanshi with at least one end cut on a virtual plane inclined to a virtual plane perpendicular to the pipe axis in advance of the straight pipe in the existing pipe section, and The position t# of the short pipes around the pipe axis is adjusted to form a nine-nine ceramic pipe line corresponding to the existing pipe bend part, and the short pipes are joined to each other. Piping method for curved pipes in existing pipes.