JPH033105B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Industrial Application Field This invention relates to a method for connecting an existing branch pipe to a new pipe within an existing main pipe.

(2) Prior Art As the connection method described above, the methods shown in FIGS. 5 to 7 are known. That is, in this known connection method, after installing the new pipe 3 by inserting it into the existing main pipe 1 (Fig. 5), first connect the existing main pipe 1 and the existing branch pipe 2.
The existing main pipe 1 and the existing branch pipe 2 within the excavation range (space) 4 are cut and removed to a predetermined length as shown by the dotted line at the branching point between the pipe and the new pipe 3. It is also cut to a predetermined length and removed (Figure 6). Next, the cut and separated leading new pipe 3a' and trailing new pipe 3b' are connected to a T-shaped pipe 5 and a joint ring 6, and the T-shaped pipe 5 and the existing branch pipe 2 are connected to a short pipe 7. and connecting rings 8 (7th
figure). The connection work is now complete, and the existing branch pipe 2 will be connected to the new pipe 3 from the existing main pipe 1 to which it had been connected up until then.

(3) Problems to be solved by the invention By the way, according to the above connection method, the new pipe 3 located at the branch part must be cut within the space 4 formed by excavating the branch part. Moreover, since the space 4 is relatively narrow, there are problems in that the workability is extremely poor and the overall connection time is long. In addition, since the cutting of the new pipe 3 is done on-site as described above, defects in the dimensions, shape, position, etc. after cutting are likely to occur, and this may cause the T-shaped pipe 5 connected to the new pipe 3 or the joint There are problems such as poor bondability with the ring 6 and the need for rework after bonding. Therefore, the technical object of the present invention is to enable connection of an existing branch pipe to a new pipe installed within an existing main pipe without cutting the new pipe.

(4) Means for solving the problem In order to solve the above technical problem, this invention is characterized by adopting the following technical means.
That is, in a method of connecting an existing branch pipe to a new pipe installed in an existing main pipe, when piping the new pipe, a spacer that can be separated from the new pipe is provided at the branching point between the existing main pipe and the existing branch pipe. , so that its tip is in contact with the leading new pipe and its rear end is in contact with the trailing new pipe, and after piping, the spacer is separated from the new pipe and removed from the branch, and this spacer is A connecting pipe is installed at the site of the pipe, and the preceding new pipe, trailing new pipe, and existing branch pipe are connected through this connecting pipe.

Therefore, according to the present invention, there is no need for troublesome work such as cutting new pipes, and an existing branch pipe can be replaced with a new pipe by simply removing the spacer and installing a connecting pipe in its place. It becomes possible to connect to.

(5) Effects of the invention As mentioned above, the connection method of the invention uses spacers, so if various spacers with different lengths are prepared, it can be applied to a variety of new pipes. Moreover, the spacer that is separated and removed from the new pipe can be made reusable, for example, by being made disassembled, which is economical. In addition, there is no need to cut new pipes, and only the existing main pipe and existing branch pipes need to be cut, so there are no particular restrictions on the cutting machine or cutting method, and the entire connection work can be completed in a short time. Workability is significantly improved compared to conventional methods, and there are excellent effects such as shortening the construction period and reducing construction costs.

(6) Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. In this embodiment, the same reference numerals are given to the same members as in the conventional one, and a detailed explanation will be given. This will be omitted.

That is, in this embodiment, when piping the new pipe 3 into the existing main pipe 1, a spacer 10 that can be separated from the new pipe 3 is located at the branch point between the existing main pipe 1 and the existing branch pipe 2. Do it like this. In addition, as a new pipe 3 to be joined to the spacer 10, a preceding new pipe 3a that has been cut to a predetermined size outside the field such as a factory and manufactured in advance.
and trailing new tube 3b are used.

As shown in detail in FIGS. 2 and 3, the spacer 10 includes a cylindrical main body 11 to which flanges 12 are fixed at both ends via reinforcing ribs 13.
A cylindrical receptacle 15 is removably attached to both flanges 12 of 1 with bolts and nuts 16 facing outward. The rear end of the leading new pipe 3a is fitted into one socket part 15, and the tip of the trailing new pipe 3b is fitted into the other socket part 15 at the same time.

Further, the length 1 between the bottom surfaces of both socket portions 15 of the spacer 10 is adjusted to the dimensions of the T-shaped pipe 5 and the like that will be installed at the site where the spacer 10 has been separated from the new pipe 3 and removed.

As shown in FIG. 1, the existing branch pipe 2 is connected to the new pipe 3, which is piped so that the spacer 10 is located at the branch part, as follows.

First, as in the past, the branch part between the existing main pipe 1 and the existing branch pipe 2 is excavated over a predetermined range, and both pipes 1 and 2 within the excavation range 4 are cut to a predetermined length and removed. do.

Next, remove the bolt nut 16 and insert the spacer 1.
After removing the main body 11 of No. 0 from both socket parts 15, both socket parts 15 are removed from the rear end of the preceding new pipe 3a and the tip of the preceding new pipe 3b. As a result, the spacer 10 is completely separated from the new pipe 3, and when removed from the branch,
The state after removal is shown in Figure 4. The rest is the same as before, connecting the leading new pipe 3a and trailing new pipe 3b via the T-shaped pipe 5 and the connecting ring 6, and connecting the T-shaped pipe 5 and the existing branch pipe 2 via the short pipe 7 and connecting ring 8. Connect each. When connecting the T-shaped tube 5, etc., in this embodiment, the length l of the spacer 10 is matched to the dimensions of the T-shaped tube 5, etc., so that the connection can be performed well, and no rework is required after joining. do not have.

The existing branch pipe 2 will now be connected to the new pipe 3.

In the above embodiment, the leading new pipe 3a and the trailing new pipe 3b which have been cut in advance are used, but it goes without saying that such cut new pipes may not be used. Further, the T-shaped tube 5, joint ring 6, etc. used for connection are shown as examples, but other connecting tubes may be used.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing an embodiment of the present invention, Fig. 2 is a partially cutaway front view of a spacer used in the above, Fig. 3 is a side view of Fig. 2, and Fig. 4 is an operation in the same. An explanatory diagram, FIG. 5 is a schematic plan view showing a conventional example, and FIGS. 6 and 7 are explanatory views of the same. 1... Existing main pipe, 2... Existing branch pipe, 3... New pipe, 3a, 3a'... Leading new pipe, 3b, 3b'... Trailing new pipe, 4... Excavation range, 5... T-tube, 6, 8
...Connection ring, 7...Short pipe, 10...Spacer, 1
1...Main body, 12...Flange, 13...Reinforcement rib, 15...Socket portion, 16...Bolt nut.

Claims (1)

[Claims] 1. In a method of connecting an existing branch pipe to a new pipe installed in an existing main pipe, when piping the new pipe, a spacer that can be separated from the new pipe is installed at the branching point between the existing main pipe and the existing branch pipe, The spacer is positioned so that its tip is in contact with the leading new pipe and the rear end is in contact with the trailing new pipe, and after piping, the spacer is separated from the new pipe and removed from the branch. A method for connecting an existing branch pipe to a new pipe in an existing main pipe, characterized by installing a connecting pipe in the ruins and connecting a preceding new pipe, a succeeding new pipe, and an existing branch pipe through the connecting pipe.