JP2015090190A - Valve installation method for gas pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve installation method for a gas pipe in which a valve can be installed between a socket and a plug engaged in thread with the gas pipe installed at a narrow location while gas leakage is restricted by a relatively simple device and work.SOLUTION: This invention relates to a method for installing an openable and closable valve 5 between a socket 2 engaged in thread with a gas pipe 1 and a plug 3 engaged in thread with the socket 2 that is operated in such a way that after a cooperative rotation of the socket 2 is prevented and the plug 3 is loosened by a rotating operative tool, a no-blow bag 8 is applied to cover the plug 3 and the socket 2, a coated portion of screw seal agent coated on a male threaded part 5a of the valve 5 is covered by a seal agent cover 12 and stored in the no-blow bag 8, the plug 3 in the no-blow bag 8 is artificially removed, then the male thread part 5a of the valve 5 is artificially applied to the socket 2 and engaged with it in thread and it is temporarily fastened, the no-blow bag 8 is removed, and the valve 5 and the plug 3 are finally fastened with the rotating operating tool.

Description

  The present invention is a gas in which a socket screwed to a gas pipe and a plug concentrically screwed to the socket are installed in a narrow space, and a valve that can be opened and closed is installed between the plug and the socket. It relates to the method of installing valves in pipes.

As described above, in the valve installation method in which a valve is installed between a screw socket and a plug in a gas pipe installed in a narrow space, how to suppress gas leakage from the gas pipe during valve installation work. It will be a problem.
However, conventionally, in such a valve installation method in a narrow space, no special solution has been proposed for the suppression of gas leaking during work (there are no patent documents etc. referring to such technology). ).

  The present invention pays attention to such a current situation, and its purpose is to suppress the leakage of gas from the gas pipe by a relatively simple device and operation, and to screw the gas pipe installed in a narrow space. An object of the present invention is to provide a valve installation method for a gas pipe in which a valve can be installed between a socket and a plug.

In order to achieve the above object, a valve installation method for a gas pipe according to the present invention comprises: a socket screwed to a gas pipe and a plug screwed concentrically to the socket; And a valve installation method for a gas pipe that installs a valve that can be freely opened and closed between the socket and the socket,
The characteristic configuration is that the socket is prevented from being swung by a swivel prevention tool and the plug is loosened by a rotary operation tool, and then the plug and socket are covered with a no-blow bag in a state where the plug and the socket are accommodated inside the bag. The screw sealant is applied to the male screw part of the valve and the valve seal part is covered with a sealant cover, and the valve is accommodated in the no-blow bag, or the screw sealant is applied to the male screw part of the valve. Then, with the valve covered with the sealant cover applied to the screw sealant covered in the no-blow bag, the no-blow bag is covered with the plug and socket inside the bag, The plug is removed from the socket by manual operation by putting a hand through the work opening of the no-blow bag. The male screw part of the valve in a state where the sealant cover is attached to the socket is screwed and temporarily tightened by manual operation, the no blow bag is removed, and the male screw part of the valve is rotated to the socket. And tightening the plug to the valve with a rotary operation tool.

According to the above characteristic configuration, the socket screwed into the gas pipe is prevented from being rotated by the anti-rotation tool and the plug is loosened by the rotary operation tool, and then the plug and socket are accommodated in the bag in a state where the plug and socket are accommodated inside the bag. Cover the blow bag and place the valve in the no blow bag, or cover the no blow bag with the plug and socket inside the bag while the valve is housed in the no blow bag. Insert the hand from the work opening of the blow bag and remove the plug from the socket by manual operation. Screw the male screw part of the valve into the socket by manual operation and temporarily tighten it to remove the no blow bag. The male screw part is finally tightened with the rotary operation tool, and the plug is finally tightened with the rotary operation tool. Gas leaked from the tube, only leakage in a no-blow bag, leakage to the outside is suppressed.
Therefore, although a no blow bag is required, the leakage of gas from the gas pipe is suppressed by a relatively simple device and operation, and the gap between the socket and the plug that is screwed into the gas pipe installed in the narrow space is reduced. Valves can be installed.

  When the male screw portion of the valve is screwed into the socket, it is indispensable to apply a screw sealant to the male screw portion of the valve in order to reliably prevent gas leakage from the screwed portion. However, since the screw sealant is generally muddy and fluid, the screw sealant applied to the male screw part adheres to the inner surface of the no-blow bag when the valve is accommodated in the no-blow bag, After the male screw part is temporarily tightened to the socket, there is a risk of adhesion when the no blow bag is removed. When the screw sealant adheres to the inner surface of the no-blow bag, it is difficult to remove the screw sealant due to the inner surface of the bag, and in some cases, the no-blow bag cannot be reused.

The construction method of the present invention pays sufficient consideration to this point, and when the valve is accommodated in the no-blow bag, the male screw part of the valve to which the screw sealant is applied is covered with the sealant cover, and the no-blow bag is covered. In the no-blow bag, the male screw part of the valve with the sealant cover attached is screwed into the socket by manual operation and temporarily tightened to remove the no-blow bag. There is no risk of adhering to the inner surface of the blow bag.
As a result, according to the method of the present invention, it is possible to reliably prevent gas from leaking from the screwed portion between the male screw portion of the valve and the socket by applying the screw sealant, and the screw sealant necessary for that purpose. While avoiding adhesion to the inner surface of the no-blow bag, the leakage of gas from the gas pipe is suppressed by a relatively simple device and work, and the socket and plug screwed into the gas pipe installed in a narrow space It was possible to install a valve in between.

  A further characteristic configuration of the valve installation method for the gas pipe according to the present invention is that the sealant cover is removed from the valve after the no-blow bag is removed and before the valve is finally tightened.

  According to the above characteristic configuration, the sealant cover is removed from the valve after the no-blow bag is removed and before the valve is finally tightened, so that the valve can be fully tightened with the sealant cover removed. Can be relatively easily performed.

  A further characteristic configuration of the valve installation method for the gas pipe according to the present invention is that the sealant cover is removed from the valve after the no-blow bag is removed and the valve is finally tightened.

  According to the above characteristic configuration, the sealant cover is removed from the valve after the no-blow bag is removed and the valve is finally tightened. Therefore, the valve is finally tightened with the sealant cover attached. Although there are some difficulties in the final tightening operation, it is possible to prevent the screw sealant from accidentally adhering to other objects during the final tightening operation of the valve.

  A further characteristic configuration of the valve installation method for the gas pipe according to the present invention is that the gas pipe is a rising gas pipe from a gas main pipe buried in the ground, the rising gas pipe, the socket, and the The plug is installed in a protector buried underground.

  According to the above characteristic configuration, the gas pipe is a rising gas pipe from the gas main pipe buried in the ground, and the rising gas pipe and the like are installed in the protector buried in the ground, that is, the rising gas pipe. However, there are a riser pipe for extracting water collected in the gas main pipe and a pressure riser pipe for measuring the pressure of gas in the gas main pipe. In a riser tube, a valve that can be opened and closed can be installed between the plug and the socket. Therefore, after installing the valve, it is possible to perform extraction or pressure measurement by preventing gas leakage from the rising pipe by a simple operation of opening and closing the valve.

Front view of gas pipe installed in the protector Front view showing the process of valve installation method to gas pipe Front view showing the process of valve installation method to gas pipe Front view showing the process of valve installation method to gas pipe Front view showing the process of valve installation method to gas pipe Plan view showing the process of valve installation method to gas pipe Plan view showing the process of valve installation method to gas pipe Disassembled perspective view of sealant cover, and perspective view of sealant cover and valve Perspective view of open / close type anti-rotation tool

An embodiment of a valve installation method for a gas pipe according to the present invention will be described with reference to the drawings.
For example, as shown in FIG. 1, the valve installation method according to the present invention is concentric with the gas pipe 1 in a rising gas pipe 1 from a gas main pipe (not shown) buried in the ground. A socket 2 that is screwed and a plug 3 that is screwed concentrically to the socket 2, and the rising gas pipe 1, the socket 2, and the plug 3 are embedded in the ground. When installed in a protector 4 as a place, a valve 5 that can be opened and closed between the plug 3 and the socket 2 while suppressing leakage of gas from the gas pipe 1 to the outside (FIGS. 3 to 3). 7 and (b) of FIG. 8).
Two protrusions 2a extending along the axis L are provided on the outer peripheral surface of the socket 2 at a position of 180 ° with the axis L as a center. An operation unit 3a is provided.

This type of gas pipe 1 includes a riser pipe for extracting water accumulated in a gas main pipe buried in the ground, and a pressure riser for measuring the pressure of gas in the gas main pipe. If there is a pipe or the like, and if it is a rising pipe for extracting water, the plug 3 is removed at the time of extracting water, and a water extracting device (not shown) is connected. Sometimes the plug 3 is removed and a pressure gauge (not shown) is connected.
In any case, it is necessary to remove the plug 3 at the time of water extraction or pressure measurement. After the water extraction or pressure measurement is completed, it is necessary to remove the water extraction device or pressure gauge and screw the plug 3 again. Gas leaks from 1.
Therefore, an openable / closable valve 5 is installed between the plug 3 and the socket 2. For example, in the case of water extraction, the valve 5 is closed and the plug 3 is removed, and after connecting the water extraction device, the valve 5 is opened and the water extraction is performed. After that, the valve is closed, the brewing device is removed, and the plug 3 is screwed again, thereby making it possible to perform the brewing and pressure measurement in a state in which gas leakage from the riser 1 is prevented. Further, the present invention relates to a method for installing the valve 5.

In carrying out the installation method of the valve 5 to the gas pipe 1, first, as shown in FIG. 2, the accompanying prevention tool 6 and the rotation operation tool 7 are used.
The follow-up prevention tool 6 includes an outer fitting portion 6a that can be fitted on the outer periphery of the socket 2 having two protrusions 2a, and includes a shaft member 6b and a gripping portion 6c that extend from the outer fitting portion 6a. I have. The rotation operation tool 7 includes an outer fitting portion 7a that can be fitted on the rotation operation portion 3a of the plug 3, and includes a shaft member 7b extending from the outer fitting portion 7a, a rotation operation portion (not shown), and the like. Yes.
Then, the lid 4 a of the protector 4 is opened, and the outer fitting portion 6 a of the follow-up prevention tool 6 is fitted on the outer peripheral portion of the socket 2. In this state, the grip portion 6c of the anti-rotation tool 6 is located outside the protector 4, so that, for example, the operator holds the grip portion 6c with the left hand to prevent the socket 2 from being rotated, and the plug 3 rotates. The external fitting part 7a of the rotary operation tool 7 is externally fitted to the operation part 3a, and the rotary operation tool 7 is rotated with the right hand to loosen the plug 3. At that time, the plug 3 is not removed from the socket 2 but is loosened to such an extent that the operator can remove it by human operation.

Next, as shown in FIG. 3, the no-blow bag 8 is covered in a state where the plug 3 and the socket 2 are accommodated inside the bag. However, FIG. 3 shows a state in which the plug 3 is removed from the socket 2 and the valve 5 is attached in place of the plug 3.
The no-blow bag 8 is composed of a transparent vinyl bag body 9, an elastic rubber arm-side rubber plate 10 and a tube-side rubber plate 11. The bag body 9 has a substantially cylindrical shape, and is provided with a circular opening 9a for inserting the operator's arm above and a circular opening 9b for inserting the pipe below. The arm-side rubber plate 10 is substantially circular and includes an arm opening 10a as a working opening at the center thereof, and the arm opening 10a is substantially concentric with the opening 9a of the bag body 9. The vicinity of the outer peripheral portion is bonded to the upper portion of the bag body 9. The tube-side rubber plate 11 is also substantially circular and includes a tube opening 11a at the center thereof, and the vicinity of the outer periphery of the bag body 9 is such that the tube opening 11a is substantially concentric with the opening 9b of the bag body 9. Adhered to the bottom of the.
The opening 9a and the arm opening 10a in the no-blow bag 8 have an inner diameter corresponding to the general arm thickness of the operator, and the opening 9b and the tube opening 11a are inserted. The inner diameter is set to an appropriate inner diameter corresponding to the diameter of the gas, and the inner diameter is set such that gas does not easily leak from the inside in the mounted state.

Using such a no-blow bag 8, the tube opening 11 a of the tube side rubber plate 11 is forcibly expanded and covered from above, and the tube opening 11 a is set so as to be fitted around the outer periphery of the gas tube 1. To do. Then, after the no-blow bag 8 is set or before the set, the valve 5 covered with the sealant cover 12 is inserted and accommodated in advance through, for example, the arm opening 10a of the arm-side rubber plate 10.
That is, as shown in FIG. 8 (b), the valve 5 has a regular hexagonal outer shape, is provided with a male screw portion 5a screwed into the socket 2 on one side, and a female screw screwed with the plug 3 on the other side. An opening / closing knob 5c for opening / closing the valve 5 is provided on the lateral side. Then, the male threaded portion 5a of the valve 5 is screwed into the socket 2. In order to reliably prevent gas leakage from the screwed portion, for example, Nutite (trade name, manufactured by Yokohama Rubber Co., Ltd.) ) Or the like is applied to the male screw portion 5a in advance and screwed together. Since the screw sealant is muddy and fluid, in order to prevent the screw sealant from adhering to the inner surface of the no-blow bag 8, the male screw part 5a coated with the screw sealant is covered with the sealant cover 12, and the no-blow bag It is housed in 8.

As shown in FIG. 8A, the sealant cover 12 is composed of a metal top plate 13, a first cover body 14, and a second cover body 15. Six magnets 16 are bonded.
The top plate 13 is formed in a regular hexagonal shape corresponding to the valve 5, and a plug opening 13 a through which the plug 3 is inserted is provided at the center. The first cover body 14 is bent in a hexagonal shape so as to be fitted on the valve 5, and an opening / closing knob notch portion 14 a for avoiding interference with the opening / closing knob 5 c of the valve 5 is provided on one side portion thereof. The second cover body 15 is bent in a hexagonal shape so as to be externally fitted to the first cover body 14, and an opening / closing knob for avoiding interference with the opening / closing knob 5c of the valve 5 is provided on one side thereof. A notch 15a for use is provided.
8B, the upper end of the first cover body 14 is connected to the back side of the top plate 13 by welding, and the second cover body 15 is externally fitted below the first cover body 14. Then, it is fixed to the first cover body 14 by welding to constitute the sealant cover 12. Therefore, when the sealant cover 12 is fitted on the valve 5, the sealant cover 12 is attracted to the valve 5 by the magnet 16, and the second cover body 15 of the sealant cover 12 is screw-sealed as shown in FIG. The male screw portion 5a of the valve 5 coated with the agent is covered. Since the second cover body 15 is externally fitted to the first cover body 14, a necessary gap is secured between the inner surface of the second cover body 15 and the male screw portion 5a, and is applied to the male screw portion 5a. The adhesion of the screw sealant to the inner surface of the second cover body 15 is reliably avoided, and the second cover body 15 is prevented from interfering with the socket 2.
However, the second cover body 15 may be provided so as to be slidably fitted below the first cover body 14 without being fixed to the first cover body 14. In this case, when the second cover body 15 hits the socket 2, the second cover body 15 slides upward, and interference with the socket 2 can be avoided by sliding the second cover body 15 upward.

The valve 5 covered with the sealant cover 12 is accommodated in the no-blow bag 8, and the operator inserts the hand H from the arm opening 10a of the no-blow bag 8, as shown in FIG. The plug 3 which has been loosened in advance is removed by human operation, and the male screw portion 5a of the valve 5 in the closed valve state is screwed into the socket 2 by human operation while the sealant cover 12 is mounted. Tighten. Such an operation can be easily performed because the inside of the no-blow bag 8 can be seen through from the arm opening 10a side of the no-blow bag 8 through the upper part and the upper side part of the transparent bag body 9. it can. In addition, the arm-side rubber plate 10 can be formed of a transparent or translucent synthetic rubber such as silicone rubber. In this case, the no-blow bag 8 is formed through a transparent or translucent portion. The inside becomes easier to see, and the work can be performed more easily.
Thereafter, the no-blow bag 8 is removed, the sealant cover 12 is also removed from the valve 5, and the plug 3 is screwed into the female screw portion 5b of the valve 5 and temporarily tightened as shown in FIG.
However, it is possible to temporarily tighten the plug 3 to the valve 5 because the plug opening 13a is provided in the top plate 13 of the sealant cover 12, so that the sealant cover 12 is attached. Temporary fastening in the no-blow bag 5 can also be performed.

Then, the male screw portion 5a of the valve 5 is finally tightened to the socket 2 by a rotary operation tool (not shown) for the valve 5, and the plug 3 is valved by the rotary operation tool 7 for the plug 3 as shown in FIG. 5 is finally tightened to the female screw portion 5b.
When the valve 5 and the plug 3 are finally tightened, if necessary, for example, to prevent the socket 2 from being rotated, an anti-rotation tool is used, but the valve 5 is provided with an opening / closing knob 5c. Therefore, the anti-rotation tool 6 shown in FIG. 2 cannot be used.
Therefore, as shown in FIG. 5, a special opening / closing type anti-rotation tool 17 is used. As shown in FIG. 9, the anti-rotation tool 17 includes a pair of outer fitting member pieces 18 and 19 configured to be openable and closable (swingable) around the base end portion, and extend from the base end portion. A shaft member 20 and a grip portion 21 are provided. The inner peripheral surfaces of the pair of outer fitting member pieces 18 and 19 are provided with recessed portions that fit into the protrusions 2a of the socket 2, and the outer fitting member pieces 18 and 19 are respectively provided with through holes 18a on the distal end side. , 19a are provided.

As shown in FIGS. 6 and 7, the pair of external fitting member pieces 18 and 19 are opened and externally fitted into the socket 2 by using the opening / closing type anti-rotation tool 17. A tapered pin member 22 is inserted and fixed over the through holes 18a and 19a.
When the pair of outer fitting member pieces 18 and 19 are fitted and fixed to the socket 2, the shaft member 20 extends upward along the axis L of the socket 2 as shown in FIG. As a result, it is possible to prevent the socket 2 from being rotated.
Therefore, by using the rotary operation tool 7 shown in FIG. 2, for example, by grasping the grip portion 21 of the anti-rotation tool 17 with the left hand and rotating the rotation operation tool 7 with the right hand, Even if the valve 5 or the plug 3 is located in the position, the socket 2 can be reliably prevented from being rotated and finally tightened.

When the plug 3 is loosened, the non-opening / closing type anti-rotation tool 6 is used as shown in FIG. 2, but the plug 3 may be loosened using the above-described opening / closing type anti-rotation tool 17. it can.
Further, the timing of removing the sealant cover 12 from the valve 5 is not limited to the time before the valve 5 is finally tightened to the socket 2 after the no-blow bag 8 is removed, as described above. Thereafter, the sealant cover 12 can be removed from the valve 5 after the valve 5 is finally tightened to the socket 2. That is, it is somewhat difficult to fully tighten the valve 5 with the sealant cover 12 attached, but it is possible to use, for example, a dedicated tool. During the work in the no-blow bag 8, the valve 5 is adsorbed by the magnet 16 of the sealant cover 12 and does not come off from the sealant cover 12 regardless of the position of the valve 5. It can prevent more reliably that it adheres to the inner surface of 8.

[Another embodiment]
In the previous embodiment, an example in which the rising gas pipe 1, the socket 2, and the plug 3 are installed in the protector 4 embedded in the ground has been shown. It is also possible to implement for the gas pipe 1 disposed in a narrow place where piping is present.
Therefore, the gas pipe 1 is not necessarily limited to the rising pipe, and for example, the gas pipe 1 can be applied to the case where the valve 5 is installed between the socket 2 and the plug 3 in the gas pipe 1 extending in the lateral direction. is there.

DESCRIPTION OF SYMBOLS 1 Gas pipe 2 Socket 3 Plug 4 Protector 5 Valve 5a Valve male screw part 6 Rotation prevention tool 7 Rotating operation tool 8 No blow bag 10a No blow bag work opening 12 Sealing agent cover 17 Open / close type rotation prevention tool H Worker's hand

Claims (4)

A valve to the gas pipe in which a socket screwed to the gas pipe and a plug screwed concentrically to the socket are installed in a narrow space, and a valve that can be opened and closed is installed between the plug and the socket. Installation method,
After the socket is prevented from being rotated by the anti-rotation tool and the plug is loosened by the rotary operation tool, the plug and the socket are covered with a no-blow bag in a state in which the plug and the socket are accommodated in the bag, and the male screw portion of the valve The screw sealant is applied to the valve and the application part of the screw sealant is covered with a sealant cover, the valve is accommodated in the no-blow bag, or the screw sealant is applied to the male thread portion of the valve. With the valve covered with a sealing agent cover in the state where the valve is accommodated in the no-blow bag, the no-blow bag is covered in a state where the plug and socket are accommodated inside the bag, and then the no-blow bag The plug is removed from the socket by human operation by putting a hand through the working opening of the socket, and the socket The male screw part of the valve in a state where the sealant cover is attached is screwed by hand operation and temporarily tightened, the no blow bag is removed, and the male screw part of the valve is finally tightened to the socket with a rotary operation tool. The valve installation method to the gas pipe which tightens the plug to the valve with a rotary operation tool.   The valve installation method for a gas pipe according to claim 1, wherein the sealant cover is removed from the valve after the no-blow bag is removed and before the valve is finally tightened.   The valve installation method to the gas pipe according to claim 1, wherein the sealant cover is removed from the valve after the no-blow bag is removed and the valve is finally tightened.   The gas pipe is a rising gas pipe from a gas main pipe buried in the ground, and the rising gas pipe, the socket, and the plug are installed in a protector buried in the ground. The valve installation method to the gas pipe of any one of 1-3.

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