JPH0577913B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydrant attachment/detachment device used, for example, when replacing a fire hydrant flanged to the end of a water pipe, and a method of attachment/detachment thereof. .

[Conventional technology]

Conventionally, the following methods [1] and [2] have been used to replace fire hydrants.

[1] Stop the water supply to the water pipe to which the fire hydrant is installed, and remove the fire hydrant while the water is stopped.
Install it.

[2] A relay device equipped with a water shutoff valve is installed between the water main and the fire hydrant (publication of Utility Model Publication No. 28-2593).

[Problem to be solved by the invention]

However, when using the conventional means described in [1] above, the water pipe to which the fire hydrant is attached is
This is a branch pipe that branches off from the water main, and does not have a water shutoff valve in the middle, so in order to shut off the water supply pipe to the fire hydrant, the water main must be shut off. . In addition, water mains include not only water supply pipes to the fire hydrants, but also factories, households,
A large number of water pipes for supplying water to each office etc. are branched and connected, and the intervals between water stop valves installed in the water main pipes are long. Therefore, in the past, there was an inconvenience in that the water supply to a wide range of factories, homes, offices, etc. was interrupted during the removal and installation of fire hydrants, that is, the water supply was cut off. Furthermore, after installing the fire hydrant, if the water supply is resumed by opening the water stop valve installed in the water main,
The scale that has adhered to the inner surface of the water mains is easily peeled off by the water supply, and as a result, it is necessary to continue running water from the faucet until water containing scale (generally called red water) stops flowing out. It's hot,
This led to wasted water.

Furthermore, according to the conventional means described in [2] above,
Although it is advantageous in that fire hydrants can be replaced without shutting off the water mains, it is disadvantageous in terms of cost to install relay devices equipped with water shutoff valves for all fire hydrants in all locations. .

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to install a hydrant at each fire hydrant, which can attach and detach the hydrant to the water pipe without stopping the flow of water to the water pipe. The object of the present invention is to obtain a simple structure that does not require installation at each location, which can reduce costs, and to provide a method for attaching and removing it.

[Means to solve the problem]

The characteristic configuration of the stopper detachment device according to the present invention, which was taken to achieve the above object, includes a cylindrical body that can be fitted externally to a flange for joining a water pipe and a stopper in a watertight manner so as to be able to slide freely in the axial direction, and a stopper. A fixture that can fix and release the side flange to the cylindrical body;
The cylindrical body can be slid relative to the flange on the water pipe side so as to move the fixed flange on the water pipe side far away from the flange on the water pipe side, and both flanges can be fixed in separate positions. a valve plate that can freely close the channel by crossing the channel in the cylinder of the cylindrical body within the width of the gap formed between the flanges by the sliding movement; The present invention is also provided with a closing member for closing the connector insertion hole.

Further, the feature of the plug removal method according to the present invention of the plug removal device having the above structure is that the cylindrical body is fitted onto the flange for joining the water pipe and the plug in a watertight state, and the cylindrical body and the flange on the plug side are connected. After fixing with the fixing device, release the connection between both flanges, close the connector insertion hole of both flanges with a closing member, and in this state operate the flange on the stopper side to separate from the flange on the water pipe side. After sliding the cylindrical body against the flange on the water pipe side using the fixture and fixing it to the flange on the water pipe side, the valve plate is closed to shut off the inside of the cylindrical body, and in this state, the stopper is closed using the fixture. The point is to release the fixation of the side flange to the cylindrical body and remove the plug.

Furthermore, the feature of the plug attaching method according to the present invention of the plug detaching device having the above-mentioned structure is that the connector insertion hole of each of the joining flanges of the water pipe and the plug is closed with a closing member, and the plug is inserted into the flange on the water pipe side. The cylindrical body is externally fitted in a watertight state and fixed to the flange on the water pipe side using an operating tool, and the valve plate is closed to block the inside of the cylindrical body at the middle part in the axial direction. After fitting the flange on the stopper side into the cylindrical body part on the downstream side of the valve in a watertight manner and fixing it to the cylindrical body with a fixture, open the valve plate, and in this state, open the cylindrical body via the operating tool. After sliding it against the flange on the water pipe side and bringing the flange on the stopper side into contact with the flange on the water pipe side, remove the blocking member, and
Both flanges are fixedly connected, and then the fixation of the flange on the stopper side of the cylindrical body by the fixture is released to remove the cylindrical body from both flanges.

The actions and effects of these are as follows.

[Effect]

When removing a stopper flanged to the end of a water pipe for replacement, etc., the above-mentioned stopper removal method is carried out using the above-mentioned stopper removal device.
In other words, after fitting the cylindrical body onto both flanges and fixing it to the flange on the water pipe side, the connection between both flanges is released, the insertion hole is closed, and in this state, the cylindrical body is attached to the flange on the water pipe side. After separating the flange on the spigot side from the flange on the water pipe side by sliding the flange against the cylindrical body, the valve plate is closed, and in this state, the flange on the spigot side is released from the cylindrical body and removed. Since the stopper can be removed from the end of the water pipe with the water cut off at the end of the water pipe, there is no need to cut off the water supply when removing the stopper.

Moreover, after removing the stopper as described above,
When attaching a repaired or inspected stopper or a new stopper to the end of the water pipe, use the above-mentioned stopper removal device and perform the above-mentioned stopper installation method.
In reality, the cylindrical body has already been attached to the flange on the water pipe side and the valve plate has been closed by implementing the above-mentioned stopper installation method, so by performing the subsequent operations, By reversing the steps in the stopper installation method described above, the stopper can be installed at the end of the water pipe with the water shut off at that end, thereby eliminating the need to stop the water supply when installing the stopper. There is no.

Of course, according to the present invention, when a new water main is installed, the cylindrical body is attached as described above to the end of the water pipe for supplying water to the tap branched from the water main, and the valve is By installing the water main with the plate closed, or by installing the water main with the end of the water pipe shut off by installing a flat flange plate on the end of the water pipe, Even after starting water supply to the main pipe, a stopper can be attached to the end of the water pipe when necessary without interrupting the water main.

〔Effect of the invention〕

Therefore, the present invention, while supplying water to a water pipe,
That is, the stopper can be removed from the end of the water pipe and attached to the end of the water pipe without causing a water outage. Rather than providing a water shutoff means in advance for each fire hydrant installation location, we effectively utilize the flanges that the water pipes and hydrants have to connect each other to prevent water shutoff. It is a plug that can be installed at any time only in areas where water leakage occurs, and has a simple structure that includes a valve plate that can be inserted and removed between the facing surfaces of the flanges in a water-tight state, making it possible to reduce costs. The detachment device was obtained.

In addition, the present invention also provides a method for removing a stopper from the end of a water pipe by using this stopper removal device, and a method for attaching the stopper to the end of a water pipe without causing a water outage and the generation of scale-containing water caused by the stoppage. We have now provided a method for removing the stopper.

In particular, as shown in the examples below, when the cylindrical body is configured to be divisible into a plurality of pieces in the circumferential direction, even if the flange diameter is smaller than the stopper diameter,
The cylindrical body can be attached to both flanges when the stopper is removed, and the cylindrical main body can be removed from the flanges when the stopper is attached.

Furthermore, as shown in the examples below, when the cylindrical body is fitted onto both flanges through annular mounts, watertightness between the cylindrical body and both flanges can be easily and reliably achieved. When the fixture, operating tool, and valve plate are attached to the cylindrical body, handling is easy.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 2, this is a device for attaching and detaching a fire hydrant C to the end of a water pipe B that is started up and branched from a water main A, without stopping the water supply to the water pipe B, As shown in Fig. 1, this can be externally fitted to flanges b and c for joining water pipes B and fire hydrant C via annular mounts 1b and 1c so as to be able to slide freely in the axial direction in a watertight state. Also, a cylindrical body 2 that can be divided into two in the circumferential direction, and bolt insertion holes 4 of both flanges b and c from which connecting bolts 3 have been removed.
It is provided with closing members 5b and 5c that can close the openings 5b and 4c.

The mount 1b on the water pipe B side is provided with an engaging piece 1b' that engages with the flange b on the water pipe B side so as to prevent the water pipe B from sliding toward the fire hydrant C side with respect to the flange b on the water pipe B side. The mount 1c on the fire hydrant C side is provided with an engaging piece 1c' that engages with the flange c on the fire hydrant C side so as to prevent the flange c on the fire hydrant C side from sliding toward the water pipe B side. Both mounts 1b and 1c are divided into two in the circumferential direction.

The cylindrical body 2 has a mount 1 on the fire hydrant C side.
A plurality of set bolts 6 (an example of a fixing device) in the circumferential direction are capable of fixing and releasing the flange c on the fire hydrant C side to the cylindrical body 2 by engaging and disengaging the flange c on the water pipe B side, and the water pipe B is attached to the mount 1b on the water pipe B side. Slide the cylindrical body 2 relative to the flange b on the water pipe B side so that the fixed flange c on the fire hydrant C side is moved toward and away from the flange b on the water pipe B side. A plurality of operating bolts 7 (an example of an operating tool) in the circumferential direction, which are movable and fixable at separate positions, are screwed together.

Moreover, the cylindrical body 2 has a cylindrical shape at an intermediate portion between the flange b on the water pipe B side and the flange c on the fire hydrant C side when the cylindrical body 2 is slid to the separated position. A valve plate 8 is attached to the main body 2 so that the main body 2 can be opened and closed.

The closing members 5b and 5c are plugs, and the closing member 5b is attached to the flange b on the water pipe B side.
is the flange c on the fire hydrant C side in the closed installation state.
It has a tapered flange abutting guide protrusion 5b' which is inserted into the bolt insertion hole 4c.

9 is an O-ring that seals between the outer circumferential surface of each flange b, c and the inner circumferential surface of the mount 1b, 1c fitted thereon, that is, maintains a watertight state; 10 is an O-ring that maintains a watertight state; , 1c and the cylindrical main body 2 that fits over the O-ring, which seals between the main body 2 and the cylindrical main body 2, that is, maintains a watertight state. 11 is a sealing material that maintains a watertight state between the cylindrical main body 2 and the valve plate 8, and 12 is a bypass plug from which water pressure on the upstream side of the valve plate 8 can be taken out.

A method for replacing a fire hydrant C using the hydrant detaching device configured as described above will be explained in the order of steps.

[1] Attach both mounts 1b and 1c externally to the corresponding flanges b and c, and
Fit the cylindrical main body 2 onto b and 1c, and connect the flange c on the fire hydrant B side and the cylindrical main body 2 with the set bolt 6.
After fixing, the bolt insertion holes 4b and 4c are closed with the closing members 5b and 5c while releasing the connection between the flanges b and c. (See Figures 3 and 4) [2] Slide the cylindrical body 2 against the flange b on the water pipe B side via the operating bolt 7, and connect the flange c on the fire hydrant C side to the flange c on the water pipe B side. It is separated from the flange b, and then the valve plate 8 is closed.
(See Figure 5) [3] Loosen the set bolt 6 to release the fixation of the flange c on the fire hydrant C side to the cylindrical body 2, and remove the fire hydrant C along with the mount 1c from the cylindrical body 2.
(See Figures 6 and 9) [4] When cleaning the inside of the water pipe B, as shown in Figure 7, the case 14 holding the cleaning tool 13 in a slidable manner is attached to the cylindrical body 2 in a watertight manner. Insert it into the case 1 and attach it with the set bolt 6.
4 using the bypass plug 12 to maintain the same water pressure upstream of the valve plate 8, open the valve plate 8, and in this state insert the cleaning tool 13 into the water pipe B to clean the inside of the water pipe B. do.

Once the cleaning is finished, clean the cleaning tool 13.
After sliding the inside of the case 14, close the valve plate 8 and remove the case 14 from the cylindrical body 2.
After that, liner 15 for repair is placed on water pipe B.
When press-fitting, as shown in FIG.
is fitted into the cylindrical body 2 in a watertight manner and attached with the set bolt 6, and after making the inside of this case 17 have the same water pressure as that on the upstream side of the valve plate 8 using the bypass plug 12, the valve plate 8 is opened and this Press-fit rod 1 in condition
The liner 15 held by the pipe 6 is press-fitted into the water pipe B, and after press-fitting, the press-fitting rod 16 is slid into the case 17, the valve plate 8 is closed, and the case 17 is removed.

[5] Repaired/inspected or new fire hydrant C
After the flange c (of course, the mount 1c is fitted externally and the closing member 5c is fitted) is fitted into the cylindrical body 2 and fixed with the set bolt 6, the valve is closed using the bypass plug 12. Make the downstream side of the plate 8 the same water pressure as the upstream side, and then
Close the valve plate 8. (See Figure 5) [6] Slide the cylindrical body 2 with the operation bolt 7, and insert the bolt insertion holes 4 in both flanges b and c.
With b and 4c aligned, flange c on the fire hydrant C side is brought into contact with flange b on the water pipe B side.
(See Figure 4) [7] While removing the closing members 5b and 5c, connect both flanges b and c with bolts 3. (See Figure 3) [8] Release the fixation of the flange c on the fire hydrant C side to the cylindrical body 2 by the set bolt 6, split the cylindrical body 2 in two and separate it from both flanges b and c. Mounts 1b and 1c on both flanges b and c
Remove from. (Refer to Fig. 2) The plug removal device of the present invention has the following functions: (a) removing the plug C;
When closing the end of water pipe B with a flange plate,
(b) When removing the flange plate at the end of water pipe B and installing stopper C, or (c) When installing a new water main pipe A with branch connection of water pipe B for stopper, water pipe B
It can be used when attaching a stopper C to the end of the pipe. Incidentally, in the case of (a), the object to be attached to the water pipe B is changed from the stopper C to the flange plate in the replacement method described above, and in the case of (b), the method of use in the case of (b) is the replacement method described above. In case (c), the object to be removed from water pipe B is simply changed from stopper C to the flange plate, and the method of use in case (c) is to attach cylindrical body 2 to flange b on water pipe B side when installing new water main A. This is a method in which the valve plate 8 is closed during installation, and the installation procedure after removal is performed among the above-mentioned replacement methods.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal cross-sectional view showing how it is attached to a flange, FIGS. 2 to 8 are process diagrams showing how to attach and remove it, and FIG. It is a line arrow view. B...Water pipe, C...Plug, b, c...Flange, 2...Cylindrical body, 6...Fixing tool, 7...Operation tool, 8...Valve plate, 4b, 4c...For insertion Hole, 5
b, 5c...Closing member.

Claims (1)

[Scope of Claims] 1. A device for attaching and detaching a stopper C to the end of a water pipe B, the device comprising: connecting flanges b and c for joining the water pipe B and the stopper C in an axial direction in a watertight manner; A cylindrical body 2 that can be slidably fitted onto the outside, a fixture 6 that can fix and release the flange c on the spigot C side to the cylindrical body 2, and a fixing device 6 that can freely fix and release the flange c on the spigot C side to the water pipe B. The cylindrical main body 2 can be freely slid relative to the flange b on the side of the water pipe B so as to be moved near and far relative to the flange b on the side, and both flanges b,
an operating tool 7 capable of fixing c; and both flanges b by the sliding movement;
A valve plate 8 that can freely close the core flow path by crossing the in-cylinder flow path of the cylindrical body 2 within the gap formed between c.
and a connecting tool insertion hole 4b of both flanges b and c,
A plug removal device equipped with closing members 5b and 5c for closing 4c. 2. The plug removal device according to claim 1, wherein the cylindrical main body 2 is divisible into a plurality of pieces in the circumferential direction. 3. The plug removal device according to claim 1 or 2, wherein the cylindrical main body 2 is externally fitted onto the flanges b and c via annular mounts 1b and 1c, respectively. 4. The plug removal device according to claim 1 or 2, wherein the fixture 6, the operating tool 7, and the valve plate 8 are attached to the cylindrical main body 2. 5. Method for removing a plug C flanged to the end of a water pipe B using a plug detaching device comprising a cylindrical body 2, a fixture 6, an operating tool 7, a valve plate 8, and closing members 5b, 5c The cylindrical body 2 was fitted onto the flanges b and c for joining the water pipe B and the tap C in a watertight state, and the cylindrical body 2 and the flange c on the side of the tap C were fixed with a fixture 6. After that, both flanges b and c are disconnected, and the connector insertion holes 4b and 4c of both flanges b and c are closed with closing members 5b and 5c, and in this state, flange c on the stopper C side is connected to the water pipe. After sliding the cylindrical body 2 to the flange b on the water pipe B side via the operating tool 7 so as to separate it from the flange b on the B side and fixing it to the flange b on the water pipe B side, the valve plate 8 A method for removing a stopper, in which the inside of the cylindrical body 2 is shut off by closing the cylindrical body 2, and in this state, the flange c on the side of the stopper C is released from the cylindrical body 2 by the fixture 6, and the stopper C is removed. 6. To fit the cylindrical main body 2 onto both flanges b and c, the cylindrical main body 2 is divided into a plurality of parts in the circumferential direction, and these divided parts form a cylindrical shape around both flanges b and c. The plug removal method according to claim 5, wherein the plug is assembled, connected, and fitted onto the outside. 7. To fit the cylindrical main body 2 onto the flanges b and c, annular mounts 1b and 1c are fitted onto the flanges b and c, respectively, and these mounts 1
The plug removal method according to claim 5 or 6, wherein the cylindrical main body 2 is externally fitted onto the caps b and 1c. 8. A plug attaching method in which a plug C is flange-jointed to the end of a water pipe B using a plug detaching device comprising a cylindrical body 2, a fixture 6, an operating tool 7, a valve plate 8, and closing members 5b, 5c. The connector insertion holes 4b and 4c of the connecting flanges b and c of the water pipe B and the stopper C are respectively closed with closing members 5b and 5c, and a cylindrical body is attached to the flange b on the water pipe B side. 2 is externally fitted in a watertight state and fixed to the flange b on the water pipe B side using the operating tool 7, and the valve plate 8 is closed to shut off the inside of the cylindrical body 2 at the middle part in the axial direction. Then, after fitting the flange c of the stopper C into the cylindrical main body part on the downstream side of the valve plate 8 in a watertight state and fixing it to the cylindrical main body 2 with the fixture 6, open the valve plate 8, and in this state. After sliding the cylindrical body 2 with respect to the flange b on the water pipe B side via the operating tool 7 and bringing the flange C on the stopper C side into contact with the flange b on the water pipe B side, the closing member 5b, 5c is removed, and both flanges 5b and 5c are fixedly connected, and then the flange b on the stopper C side of the cylindrical body 2 is released from the fixture 6, and the cylindrical body 2 is removed from both flanges b and c. How to install a stopper. 9. The plug attachment method according to claim 8, wherein the cylindrical body 2 is removed from the flanges b and c by dividing the cylindrical body 2 into a plurality of pieces in the circumferential direction.