JPS603430Y2 - Branch pipe fitting for waterway change - Google Patents

Description

[Detailed description of the invention] This invention is used for changing waterways without stopping the flow of water in water mains buried underground, that is, when changing the waterway without stopping water supply. This relates to branch pipe joints.

Conventionally, when changing the waterway without water outage, as shown in Fig. 1, a water stop valve divided into two was installed at the point of the water main 1 where the waterway was to be changed. A water shutoff pipe 2a having a valve housing 2 for fitting and a branch joint pipe 3 having a branch pipe joint 3a configured in two are installed at a certain interval, and the water supply inside the valve housing 2 is installed. Cut the main pipe 1, insert a water stop valve into the cut part to shut off the waterway of the water main 1, and branch it to the branch pipe receiving part 3a of the branch joint pipe 3 via the branch water control valve 5. By connecting the pipe line 6, the water channel of the flowing water was changed.

Therefore, when carrying out construction work to change the waterway, a fairly wide excavation area A is required as shown by the dotted line in the diagram, and the number of parts increases, resulting in labor costs, material costs, etc. It had the disadvantage of being bulky.

In addition, if the pipe type of the water main 1 is, for example, an asbestos pipe, the outer diameter of this asbestos pipe is not standardized.
Even if the asbestos pipes have the same nominal size, there are often discrepancies in the outer diameter of the asbestos pipes.
Since the inner diameter of the water pipe v1 must be determined after measuring the actual outer diameter of the water pipe v1, there is a drawback that it is not possible to immediately respond to changes in the waterway in an emergency.

In view of these conventional drawbacks, the purpose of the present invention is to promote the reduction of the excavation area when changing waterways, and to reduce material costs and reduce the number of parts and the means required to install them. To enable economical construction by reducing labor costs, etc., while also easily adapting to the outer diameter dimensions even when applied to water mains made of asbestos pipes whose outer diameter dimensions are not standardized. To provide a branch pipe joint for changing a waterway, which can immediately respond to a change in waterway in an emergency.

The features of the branch pipe joint for changing waterways of this invention are as follows:
A bottomed cylindrical valve housing with an open top for inserting a water stop valve by vertically penetrating the pipe shaft of the water main between the pipe ends of the vertically divided pipe joint body; A short cylindrical branch pipe receiving part is formed on the side surface of one pipe end perpendicular to the pipe axis of the water main, and an inner flange whose diameter can be expanded by cutting is formed on the inner diameter surface of each pipe end. A gasket mounting groove for fitting the gasket is provided on the outside of the inner flange.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In FIGS. 2 to 5, 4 is a pipe joint body divided into two parts vertically, and the pipe end portions 43, 42 for,
A bottomed cylindrical valve housing 2 having an open top 41 for penetrating the pipe shaft of the water main 1 vertically to fit a water stop valve 47 therein, and having a pair of left and right drain valves 8 provided at the bottom. , one tube end 4
A short cylindrical branch pipe receiving part 44 is formed on the side surface of the water main pipe 1 so as to be perpendicular to the pipe axis of the water main pipe 1 .

In addition, on the inner diameter surface of each tube end 43, 42, there is an inner flange 45 that can be easily cut with a cutter or the like to enlarge the diameter, and on the outside of the inner flange 45, a packing 7 is fitted. A gasket mounting groove 50 is provided.

Therefore, in order to change the channel of flowing water flowing in the water main 1 using the branch joint for changing the waterway of the present invention constructed as described above, first, as shown in FIG. An excavation area B of a size necessary for installing a branch pipe joint for changing the waterway is provided by excavating around the place where the waterway of the water main 1 buried inside is to be changed.

Next, the outer diameter of the water main 1 is measured, and the inner diameter of the inner flange 45 provided on the inner diameter surface of each pipe end 43, 42 is cut and expanded according to the outer diameter using a cutter or the like. diameter.

Next, around the water main 1 exposed in the excavation area B, the pipe joint main body 4 divided into upper and lower parts is joined from above and below, and the inner diameter surface of the inner flange 45 with the enlarged diameter is adjusted to the outer diameter of the water main 1. along the surface,
In this state, the joint surfaces of the upper and lower pipe joint bodies 4 are immovably fixed to the water main 1 by, for example, welding.

Next, the packing 7 is fitted into the packing mounting groove 50 of the pipe joint body 4 and brought into contact with the inner flange 45, and the packing 7 is attached to the inner flange with the press ring 46 fitted around the outer periphery of the water main 1. 45 and the outer diameter surface of the water main 1 to connect the pipe joint body 4 to the water main 1.
be fixed in a watertight manner.

Next, the water main 1 inside the valve case 2 is cut vertically using a conventionally known water cutoff construction method, and a water stop valve 4 is installed in this cut portion.
7 is inserted from above to shut off the flowing water flowing into the water main 1 with the water stop valve 47 inserted into the valve casing 2, and then a water diversion hole is inserted into the water main 1 through the branch pipe receiving part 44. 48 is bored, and the branch pipe 6 is connected to the branch pipe receiving portion 44 via the branch water control valve 5 to change the water channel.

After the waterway has been changed by connecting the branch pipe 6 through the above steps, the main water pipe 1 with the other pipe end 42 of the pipe joint body 4 fixed is connected as shown in FIG. For example, the water main 1 is cut at the push ring part, a blind cover 9 is attached to the cut part of the water main 1, and the old waterway is completely shut off with the blind cover and the water stop valve, and at the same time, in preparation for an increase in water pressure resistance due to the change of the waterway. Then, the detachment prevention fitting 10 of the water main 1 is attached to the end of the water main 1 to which one pipe end 43 of the pipe joint body 4 is fixed, and after that, soil C is poured into the excavation area B. Then, the water main 1 whose waterway was changed is backfilled.

Note that when shutting off the water flowing through the water main 1 with the water stop valve 47, if the pair of left and right drain valves 8 provided at the bottom of the valve housing 2 are simultaneously opened and water is drained from these drain valves 8, the water main 1
Chips generated during cutting are discharged to the outside from the drain valve 8, so that the water stop valve 47 reliably shuts off the water flow, and at the same time, the water inside the water main 1 on the pipe end 43 side of the pipe joint body 4 Since the water pressure of the flowing water flowing through the pipe end 42 and the water pressure of the flowing water flowing inside the water main 1 on the pipe end 42 side are approximately equalized, the water stop valve 4
7 can be smoothly fitted into the cut portion of the water main 1 without experiencing strong hydraulic resistance.

In this way, the present invention provides a bottomed pipe with an open top for inserting a water stop valve that penetrates the pipe shaft of the water main pipe vertically between the pipe ends of the pipe fitting body which is divided into upper and lower parts. A cylindrical valve housing, a short cylindrical branch pipe receiving part perpendicular to the pipe axis of the water main on the side surface of one pipe end, and cutting on the inner diameter surface of each pipe end. It has an inner flange that can be expanded in diameter, and a gasket mounting groove on the outside of the inner flange to accommodate the gasket, so it can be installed in two parts at the place where the waterway of the conventional water main is changed. a stop pipe having a valve housing for inserting a water stop valve;
There is no need to create a large excavation area, which is required when changing the waterway by installing branch joint pipes with split pipe receiving parts at regular intervals. Since it is only necessary to provide a narrow excavation area that is sufficient to install pipe fittings, it is possible to promote the linearization of the excavation area, and the number of parts and the labor required to install these parts can be reduced, reducing labor costs. Construction costs can be significantly reduced by cutting down on material costs and other costs.

In addition, in this invention, an inner flange that can be expanded by cutting is provided on the inner diameter surface of the pipe end of the pipe joint body, so it can be used for water mains using asbestos pipes with different outer diameter dimensions. Since it can be reliably installed by simply cutting and enlarging the inner diameter surface of the inner flange at the construction site, it is possible to immediately respond to urgent changes to the waterway.

[Brief explanation of drawings]

Fig. 1 shows a conventional example, in which a mode in which a waterway is changed using a stop pipe and a branch joint pipe, and a plan view showing the excavation area;
Figure 2 is a plan view showing how the water channel is changed using the branch pipe joint of the present invention and its excavation area, Figure 3 is an enlarged cross-sectional view of Figure 2, and Figure 4 is an enlarged view of Figure 2. A vertical sectional view and FIG. 5 are side views showing a state in which the blind lid and the detachment prevention fitting are attached. 4...Pipe joint body, 43, 42...Pipe end, 1...Water main, 47...Water stop valve, 41... ... Upper part, 2 ... Bento, 44
... Branch pipe receiving part, 45 ... Inner flange, 7
...Packkin, 50...Groove for installing the patch.

Claims (1)

[Scope of utility model registration request] A bottomed bottom with an open upper part 41 for penetrating the pipe shaft of the water main 1 vertically and fitting a water stop valve 47 between the pipe ends 43 and 42 of the pipe joint main body 4 divided into upper and lower parts. A short cylindrical branch pipe receiving part 44 is formed perpendicularly to the pipe axis of the water main 1 on the side surface of the cylindrical valve housing 2 and one pipe end 43, and each pipe end 43. Inner flange 4 that can be expanded in diameter by cutting on the inner diameter surface of the end
5, and a backing attachment groove 50 for fitting the backing 7 on the outside of the inner flange 45.