JP3449504B2 - How to install a switching valve for continuous water works - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching a switching valve to a branch position when a branch pipe is attached to an existing water supply main pipe to perform uninterrupted water work.

[0002]

2. Description of the Related Art Conventionally, a branch pipe is branched into an existing water supply main,
An example of uninterrupted water work in which a switching valve can be attached to the branch position to change the flow path is disclosed in Japanese Utility Model Publication No. 5-4635.

This will be described with reference to FIGS. 8 and 9. First, the switching valve 40 comprises a vertical valve portion 40A and a horizontal valve portion 40B. The vertical valve portion 40A has a bottomed cylindrical main body 41 as a base body. Vertical strips 42 are vertically provided on the side surface and the bottom surface of the cylindrical body 41 at intervals of 90 °. A groove 44 in which the packing 43 is mounted is recessed in the vertical strip 42. The water passage holes 45 are formed on three sides of the side surface of the cylindrical body 41 surrounded by the vertical strips 42, and the other one side surface forms a closed wall surface 46. As a result, the vertical valve portion 40A
Will form a so-called three-way valve.

The horizontal valve portion 40B is made of a disc body and is integrally connected to the upper portion of the cylindrical main body 41 of the vertical valve portion 40A, and its outer surface 47 is flush with the vertical strip 42. The outer surface 4
A groove 48 is formed in the circumferential direction 7 and is continuous with the groove 44.

The switching valve 40 constructed as described above is inserted into the vertical contact plate 51 provided on the inner peripheral surface of the housing 50 so that the vertical strips 42 correspond to each other. Can be switched by rotating the cylindrical body 41.

[0006]

Such a switching valve is provided with
When installing between main pipes that have been cut in advance by a drill so as to be concentric with the central axis of the casing, the cutting portion 52 of the main pipe protrudes inward from the inner peripheral surface of the casing 50, which becomes an obstacle. However, there is a problem that the switching valve has a complicated structure as described above and is costly.

The present invention has been made to solve the above-mentioned problems, and uses the inner peripheral surface of the housing directly as a valve seat,
An object of the present invention is to provide a method for mounting a switching valve for uninterrupted water construction, which has a simple structure and can sufficiently reduce the flow resistance of water.

[0008]

In order to solve the above-mentioned problems and to achieve the object, a method for mounting a switching valve for uninterrupted water construction of the present invention is to install the water main pipe at a branch position of an existing water main pipe. Body part that has a larger diameter than that and has an opening at the upper end,
A method of mounting a switching valve that rotates in the body part on a casing provided with an extension pipe part and a branch pipe by uninterrupted water construction, by perforating and cutting the branch position of an existing water supply main, and then by supplying water. After moving one of the existing water main pipe and the housing relatively in the pipe axial direction of the water main pipe, so that the cut portion on the construction area side of the pipe is immersed in the extended pipe portion, The switching valve is fitted in such a manner that its valve body is in close contact with the inner surface of the body.

In the method of mounting the switching valve for uninterrupted water work according to the present invention, it is preferable that the valve body of the switching valve has an annular packing.

In the method of mounting the switching valve for uninterrupted water work according to the present invention, it is preferable that at least an annular packing is formed at the periphery of the opening of the extension pipe and the branch pipe.

[0011]

According to the present invention, the cutting portion on the construction area side of the water supply main is out of the range of rotation of the valve body. Therefore, even if the valve body is in close contact with the inner peripheral surface of the body, There is no risk of interference.
Therefore, the inner peripheral surface of the body portion functions as a valve seat, the cross-sectional area of flowing water becomes large, and the flow resistance can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 is an existing water supply main pipe, and 2 is a switching valve. 1 and 2 show a state where the switching valve 2 is attached by applying the present invention. First, the configuration of the branch portion having the switching valve 2 will be described.

The branch portion has a bottomed casing 6 composed of a body portion 3, an extended pipe portion 4 and a branch pipe 5 with an inner diameter larger than the outer diameter of the water supply main pipe 1, and an upper end opening of the body portion 3. Valve lid 7 for closing the part
And a horizontal partition plate 8 which is watertightly provided near the upper part in the body 3, and a switching valve 2 having a valve body 9 housed in the body 3.

The casing 6 having the body portion 3, the extending pipe portion 4 and the branch pipe 5 has a vertically divided two-part structure with a horizontal plane passing through the center of the water supply main pipe 1 as a boundary, and the upper and lower opposed ends. The flanges (not shown) provided on the parts are joined together to form an integral housing 6.

The horizontal partition plate 8 is placed on a series of locking pieces 10 fixed to the inner surface of the body 3, and is fixed by a plurality of locking bolts 11 penetrating the peripheral wall of the body 3. 12
Is a packing for watertightness.

The valve body 9 is composed of a partition plate 9a having an arcuate cross-section which can be slid in the circumferential direction in close contact with the inner peripheral surface of the body portion 3, and a pair of fan-shaped members continuously provided at the upper and lower ends thereof. The support shafts 9b and the base plates of both support plates 9b are fixed to the valve shaft 13 which rotates about the central axis of the body portion 3, whereby the valve shaft 1
It is possible to rotate integrally with 3.

The upper end of the valve shaft 13 is the horizontal partition plate 8 described above.
And the lower end is pivotally supported by the bottom wall of the housing 6, respectively. Reference numeral 14 is a packing embedded in the entire circumference of the edge of the partition surface of the partition plate 9a.

The partition plate 9a has a length and width capable of closing the openings 3a, 3b communicating with the branch pipe 5 and the main water supply pipe 1 in the body portion 3.

Next, the procedure for mounting the switching valve 2 will be described with reference to FIGS.

First, as shown in FIG. 3, a casing 6 is attached to the existing water supply main 1 in a water-sealed state as an upper and lower half-enclosing enclosure that can surround the existing water supply main 1 from above and below. An opening / closing case 21 having a sluice valve 24 is attached to the top of the housing 6, and a work case 22 is attached to the top of the opening / closing case 21. The work case 22 is internally provided with a predetermined function, for example, a mechanism for rotating and driving the drill 23. Then, after sending out the drill 23 and cutting the water supply main pipe 1, the drill 23 is raised again into the work case 22, and the sluice valve 2
Close 4

In this state, as shown in FIG. 4, both cutting portions C and the center of the housing 6 are concentric with each other, and the diameter of the drill 23 is smaller than the inner diameter of the body portion 3. The cut portion C projects inward from the inner peripheral surface of the body portion 3.

Next, as shown in FIG. 5, in the casing 6, the cutting portion C on the downstream side of the water supply main pipe 1 has the opening 3 of the body portion 3.
It is horizontally moved toward the upstream side so as to be immersed in the outside of b, that is, inside the extended pipe portion 4. The movement of the housing 6 at this time is preferably minimized to the extent that the partition plate 9a of the valve body 9 does not interfere with the cutting portion C.

Next, as shown in FIG. 6, the drill 23 is replaced with the valve body 9 and the valve body 9 is inserted into the body portion 3 together with the horizontal partition plate 8. After fixing the horizontal partition plate 8 with the locking bolt 11, the valve lid 7 is attached.

Lastly, the caulking material 15 is filled in the receiving portion 4a of the extended pipe portion 4 which is temporarily fixed, and the seal rubber 17 is pressed by the split pressing wheel 16 to achieve watertightness.
Moreover, the movement of the housing 6 in the tube axis direction is prevented.

When the switching valve 2 is attached in this manner, the downstream cutting portion C of the water supply main pipe 1 is immersed in the extension pipe portion 4 and is out of the range of rotation of the valve body 9, Disc 9
Does not interfere with the downstream cutting portion C. Therefore, since the water stop surface of the valve body 9 that rotates to switch the water flow path to the downstream main water supply pipe 1 or the branch pipe 5 is the inner surface of the body portion 3 of the housing 6, the housing 6 is used as a switching valve. It can be effectively used as a part.

As a result, without considering the cutting portion C,
The running water passage opening cross-sectional area of the opening 3a to the branch pipe 5 can be made as large as possible, and the running water resistance is also greatly reduced.

Next, the outline of the process of uninterrupted water construction using the switching valve 2 attached as described above is shown in FIGS. 7 (a), (b),
Explaining with reference to FIG. 7C, first, as shown in FIG. 7A, the switching valves 2 are attached to both ends of the construction area P of the water supply main pipe 1 by the above-described method, and the bypass pipe U is provided. At this time, if the housing 6 is attached to the main water supply pipe 1 and the branch pipe is provided with a plug, the water supply branch work can be performed at any time regardless of the drilling work.

Then, the switching valve 2 is attached, and as shown in FIG.
As shown in FIG. 3, the sluice valve 9b of the upstream switching valve 2 closes the downstream opening 3b of the housing 6, and the sluice plate 9b of the downstream switching valve 2 conversely closes the upstream opening 3b. If it is blocked, water will flow through the bypass pipe U in the direction of the arrow in the figure.

After appropriately constructing a predetermined area of the water supply main pipe 1 in such a state, the partition plates 9b of the switching valves 2 and 2 on the upstream and downstream sides are rotated to close the opening 3a. Water comes to flow through the water supply main P ′ attached to. Then, the bypass pipe U is removed, and the uninterrupted water construction is completed.

As described above, by using the present embodiment, it is possible to easily perform the uninterrupted water supply work by installing the switching valve 2 after the work, without giving the running water resistance in the main water supply pipe 1 and at low cost. .

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are changes and additions within the scope not departing from the gist of the present invention, the present invention is not limited. Included in the invention.

For example, the packing 14 embedded in the partition plate 9a may be mounted so as to cover the peripheral portions of the openings 3a and 3b of the housing 6.

[0034]

According to the present invention, the cutting portion on the construction area side of the water main is out of the range of rotation of the valve body, so that even if the valve body is in close contact with the inner peripheral surface of the body portion. There is no risk of interfering with the cutting part. Therefore, the inner peripheral surface of the body portion functions as a valve seat, the cross-sectional area of flowing water becomes large, and the flow resistance can be reduced.

[0035]

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional plan view of a switching valve and a water supply mains cutting portion mounted by applying the present invention.

FIG. 2 is a vertical sectional front view taken along line XX in FIG.

FIG. 3 is a schematic view showing a cutting process of a water supply main.

FIG. 4 is a sectional view taken along line YY of FIG.

FIG. 5 is a cross-sectional view showing a case after the housing is horizontally moved.

FIG. 6 is a schematic view showing a step of inserting a valve body.

7 (a), (b) and (c) are schematic diagrams showing steps of uninterrupted water work.

FIG. 8 is a sectional view showing a conventional switching valve.

9 is a perspective view of the valve body of FIG. 8. FIG.

[Explanation of symbols]

1 Existing water supply main 2 switching valve 3 torso 3a, 3b opening 4 Extended pipe section 4a Receptacle 5 branch pipes 6 housing 7 valve lid 8 horizontal dividers 9 valve body 9a Partition plate 9b support plate 10 Locking piece 11 Locking bolt 12 packing 13 valve shaft 14 packing 15 Caulking material 16 push ring 17 Seal rubber 21 openable case 22 Work case 23 drills 24 gate valve C cutting part

Continuation of front page (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 41/04 F16K 11/072 F16K 27/00 F16L 55/00

Claims (3)

(57) [Claims] 1. A casing having a trunk portion having a diameter larger than that of the existing water main pipe and having an opening at an upper end, an extended pipe portion, and a branch pipe at a branch position of the existing water main pipe, It is a method of installing a switching valve having a valve body that rotates inside the body by uninterrupted water construction, by cutting the branch position of the existing water main and then cutting the water main.
To immerse the cutting part on the construction area side in the extension pipe part,
After moving one of the existing water supply main and the housing relatively in the pipe axial direction of the water supply main, the inner peripheral surface of the body is
A method of mounting a switching valve for uninterrupted water work, characterized in that the switching valve is fitted into a body as a valve seat of a valve body . 2. The method for mounting a switching valve for uninterrupted water work according to claim 1, wherein an annular packing is formed on the valve body of the switching valve. 3. The method for mounting the switching valve for uninterrupted water work according to claim 1, wherein an annular packing is formed at least at the periphery of the opening of the extension pipe and the branch pipe.