JP6865415B2 - Seal plug device and pipeline sealing method - Google Patents

Description

The present invention relates to a seal plug device and a pipeline sealing method, and particularly more reliably seals the opening at the end of the pipeline as compared with the conventional one, and the seal plug device and the pipe are less likely to be displaced from the sealing position or do not occur. Regarding the road sealing method.

In order to ensure uniform airtightness of the pipe to be sealed and to obtain good workability of rearranging, the plug body to be pressed against the inner surface of the pipe and the plug body to spread in the radial direction in a wide area in the pipe. A former organizing seal plug device is known which is provided with a lock pin pivotally supported by the pipe and has a tapered surface on the side surface of the plug body so as to facilitate entry work in a pipeline (Patent Document 1). reference).

Patent No. 4036721

However, there is room for improvement in the seal form and the like in the conventional seal stopper device.

Therefore, the problem to be solved by the present invention is to provide a seal plug device and a pipeline sealing method capable of safely performing a leak inspection of a fluid flowing in a pipeline and realizing good sealing performance. It is to be.

As a means for solving the above-mentioned problems, the seal plug device according to the present invention is a seal plug device mounted inside a pipeline in which a sealing lid is fixed to an opening at one end, and is mounted in the pipeline. Occasionally, a main body portion whose axis is arranged substantially parallel to the axis line of the pipeline, a first valve body and a second valve body provided on the main body portion and opened in only one direction when a specific pressure is applied, and the above. The first valve body and the second valve body are provided with a regulating part provided in the main body and restricting the displacement of the main body to the opposite side of the approach direction side opposite to the approach direction side in the pipeline. The valve opening direction is provided in opposite directions so as to face the approach direction side or the anti-entry direction side, and the first valve body is a second region which is a region in the pipeline when the valve is opened. The fluid flows into the first region, which is the region between the seal plug device and the sealing lid attached to the cut conduit, and the second valve body is opened to obtain the above-mentioned valve body. The pressure in the second region is reduced so that the pressure in the first region and the pressure in the second region are the same.

In the seal plug device according to the present invention, it is preferable that the operating pressures of the first valve body and the second valve body are different.

In the seal plug device according to the present invention, it is preferable that the first valve body or the second valve body can be forcibly opened from the anti-entry direction side.

In the seal stopper device according to the present invention, the regulation unit has a first regulation unit and a second regulation unit, and the first regulation unit regulates the displacement of the main body portion to the approach direction side and the anti-entry direction side. The second regulating unit preferably regulates the displacement of the main body portion in the anti-entry direction side.

In the seal plug device according to the present invention, the pipeline has a first pipeline and a second pipeline branching from the first pipeline, and the main body portion is directed from the second pipeline to the first pipeline. In the inserted state, the end of the main body on the approach direction side protrudes inside the first pipe from the branch between the first pipe and the second pipe, and the regulating part is the first pipe. It is preferable to increase the diameter larger than the inner diameter of the second pipeline at least in the path or in the second pipeline.

As another means for solving the above-mentioned problems, the pipeline sealing method according to the present invention is a pipeline sealing method for sealing a pipeline using a seal plug device, and the seal plug device is a pipe. The first valve body and the second valve body, which are provided on the main body and the main body whose axis is arranged substantially parallel to the axis of the pipeline when installed in the road, open only in one direction when a specific pressure is applied. The valve body and the second valve body and the second valve body are provided with a valve body and a regulating part provided in the main body part and restricting the displacement of the main body part to the opposite side of the approaching direction side opposite to the approaching direction side in the pipeline. The valve bodies are provided in opposite directions so that the valve opening direction faces the approach direction side or the anti-entry direction side, and the first valve body is formed in the region in the pipeline by opening the valve. A fluid flows from a second region into a first region, which is a region between the seal plug device and a sealing lid attached to the cut conduit, and the second valve body is opened. By doing so, the pressure in the second region is reduced, and the pressure in the first region and the pressure in the second region are made the same.

In the present invention, by providing two valve bodies having opposite valve opening directions, it is possible to reduce the pressure in the pipeline for suppressing gas backflow before attaching the sealing lid to the opening of the pipeline, and fluid leakage inspection is possible. Can be done safely. Furthermore, since it is possible to suppress the formation of gaps and the like at the fusion site due to the backflow of gas when the sealing lid is fused, a seal stopper device capable of reliably suppressing fluid leakage as compared with the conventional case. Can be provided.

FIG. 1 is a plan view showing a seal stopper device according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the seal stopper device shown in FIG. FIG. 3 is a schematic cross-sectional view of a state in which the seal stopper device shown in FIG. 1 is in operation. FIG. 4 is a schematic cross-sectional view showing a process of attaching the seal stopper device to the service team in the original rearranging work. FIG. 5 is a schematic cross-sectional view showing a pressure adjusting process and a sealing process in the original rearranging work.

The seal plug device according to the present invention can be used together with a sealing lid mounted on one end opening of the pipeline, and the seal plug device can be used as a temporary plug mounted in the pipeline.
An embodiment of the seal stopper device according to the present invention will be described with reference to FIGS. 1 to 3.
Note that FIG. 1 is a plan view showing a seal stopper device 1 according to an embodiment of the present invention. Further, FIG. 2 is a schematic cross-sectional view of the seal plug device 1 on the cut surface shown in FIG. FIG. 3 is a schematic cross-sectional view of the state in which the seal stopper device 1 shown in FIG. 1 is in operation.

First, as shown in FIGS. 1 and 2, the seal plug device 1 includes a main body portion 2, a relief valve 31, a check valve 32, and a regulation portion 4.

The main body 2 has a substantially cylindrical shape, and its axis is arranged substantially parallel to the axis of the pipeline when it is mounted in the pipeline. The main body portion 2 has two major portions, specifically, an operating portion 5 and a lid portion 6.

When the seal plug device 1 is mounted in the pipeline to be sealed, the actuating portion 5 is on the entry direction side of the seal plug device 1 into the pipeline (back side in FIG. 1, lower side in FIG. 2). It is a part provided in. The operating portion 5 is a portion that is displaced along the axis of the main body portion 2 when the seal plug device 1 described later is operated.
The operating portion 5 is provided with a through hole into which one end of the relief valve 31 and the check valve 32 can be inserted and arranged. The relief valve 31 and the check valve 32 will be described later.

The lid portion 6 is a portion provided on the anti-entry direction side (front side in FIG. 1 and upper side in FIG. 2) opposite to the approach direction side. The lid portion 6 is a substantially disk-shaped member, and when attached to the pipeline, the lid portion 6 is arranged on the opening side of the pipeline. The lid portion 6 has a holding portion 9 for rotatably holding the operating portion 8 arranged at a substantially central portion.
As shown in FIGS. 1 and 2, the lid portion 6 is provided with a plurality of through holes, and the operation portion 8, the relief valve 31, the check valve 32, etc., which will be described later, are inserted into the main body portion 2 from the through holes. Has been done. The operation unit 8 will be described later together with the relief valve 31 and the check valve 32.

The operation unit 8 is a bolt-shaped member, and has an operation recess 10 at one end and an external screw portion 11 on the peripheral side surface of the other end.
The operating recess 10 is a recess for inserting and fitting an appropriate operating jig when sealing the pipeline using the seal plug device 1, and is located on the lid 6 side as shown in FIG. Arranged to be exposed.
The operation unit 8 is held on the peripheral side surface where the external screw portion 11 is not provided so that the operation unit 8 is immovable in the approach direction and the direction along the counter-entry direction and can rotate about the axis of the operation unit 8. It is held by the part 9.
The external threaded portion 11 is a thread provided on the approaching direction side from the holding portion 9, and is formed on the inner threaded portion 12 formed on the inner surface of the insertion hole provided in the substantially central portion on the counter-entrying direction side of the operating portion 5. It can be screwed.

The relief valve 31 and the check valve 32 are arranged so that the valve opening directions are opposite to each other. Specifically, the relief valve 31 and the check valve 32 are valve bodies that open only in one direction when a specific pressure is applied, so that the respective valve opening directions are directed to the approach direction side or the counter-entry direction side. Are provided in opposite directions. The relief valve 31 and the check valve 32 are fixedly arranged with respect to the operating portion 5, and when the valve is opened, the through hole of the lid portion 6 on the opposite approach direction side and the through hole of the operating portion 5 on the approach direction side are respectively arranged. It is possible to communicate. The relief valve 31 is an example of the first valve body in the present invention, and the check valve 32 is an example of the second valve body in the present invention.
In this embodiment, as an example, a relief valve 31 having an operating pressure of 0.1 MPa and a check valve 32 having an operating pressure of 7 kPa are used. Depending on the pressure of the gas, for example, a relief valve 31 having an operating pressure of 0.1 to 0.3 Mpa may be used, and a check valve 32 having an operating pressure of 1 kPa or less may be used. However, the present invention is not limited to these operating pressures, and can be appropriately set in consideration of the type of pipeline to be applied, the pressure of the fluid flowing in the pipeline, and the like.

The regulating portion 4 is provided on the main body portion 2 and regulates the displacement of the main body portion 2 in the anti-entry direction side. In the present embodiment, the regulation portion 4 has a diameter expansion portion 41 and a claw portion 42.
The diameter-expanded portion 41 is an example of the first regulating portion in the present invention, and the claw portion 42 is an example of the second regulating portion in the present invention.

The diameter-expanding portion 41 is provided on the peripheral side surface of the main body portion 2, and has an elastic body that can expand in the radial direction of the main body portion 2 between the operating portion 5 and the lid portion 6. The material of the elastic body of the enlarged diameter portion in the present invention is not particularly limited as long as it is not easily altered or denatured by the fluid flowing in the pipeline, and the elastic body of the enlarged diameter portion 41 in the present embodiment uses an elastomer. There is. The enlarged diameter portion 41 is provided so as to extend to the peripheral side surface of the operating portion 5 and the peripheral side surface of the lid portion 6.

The lid portion 6 has a first tapered portion 71 formed of an inclined surface toward the approaching direction side on the approaching direction side of the peripheral side surface of the lid portion 6. The actuating portion 5 has a second tapered portion 72 formed of an inclined surface toward the anti-entry direction side on the anti-entry direction side of the peripheral side surface of the actuating portion 5. The enlarged diameter portion 41 is arranged so as to be passed to the first tapered portion 71 and the second tapered portion 72 while surrounding the main body portion 2.

The enlarged diameter portion 41 regulates not only the displacement of the main body portion 2 toward the approaching direction side but also the displacement of the main body portion 2 toward the approaching direction side. Specifically, by expanding the diameter of the diameter-expanded portion 41, the main body portion 2 is substantially locked in the pipeline, and displacement toward the approach direction side and the counter-entry direction side is suppressed. The usage pattern and the effect of the diameter-expanded portion 41 will be described later with reference to FIGS. 3 and 4.

The claw portion 42 is provided on the peripheral side surface of the main body portion 2 and has a substantially rod-shaped member that can be expanded and contracted in the radial direction of the main body portion 2. As shown in FIG. 1, a total of four claw portions 42 are provided at 90 ° intervals, and as shown in FIG. 2, they are provided on the approaching direction side of the second tapered portion 72 of the operating portion 5. The claw portion 42 is urged outward in the radial direction of the operating portion 5 by a coil spring built in a recess of the operating portion 5 in which the claw portion 42 can be accommodated. As a result, in the initial state shown in FIGS. 1 and 2, the claw portion 42 is in a radially outwardly protruding state of the main body portion 2.

The claw portion 42 regulates the main body portion 2 from coming off in the opposite direction direction. The specific usage pattern and action / effect of the claw portion 42 will be described later with reference to FIGS. 3 and 4. As for the claw portion 42, since the claw portion 42 is not shown on the cut surface of FIG. 1 in FIG. 2, the protruding state and the protruding position from the main body portion 2 are shown only by contour lines.

FIG. 3 shows a seal plug device 1 that can be operated to seal the pipeline. In order to make the pipeline in a sealable state, the operation jig J is inserted into the operation recess 10 of the operation unit 8 as shown in FIG. 3, and a rotation operation is performed. By this rotation operation, the operation unit 8 rotates about its axis. Since the operating unit 8 is immobile in the approach direction and the direction along the counter-entry direction by the holding unit 9, only the rotational operation occurs.

When the operating portion 8 rotates, the operating portion 5 is displaced in the approach direction and the counter-entry direction by the internal screw portion 12 of the operating portion 5 that is screwed into the external screw portion 11 of the operating unit 8. Therefore, by rotating the operating unit 8 in a specific direction (clockwise in this embodiment), the operating unit 5 can be displaced in the counterclockwise direction.

When the operating portion 5 is displaced along the anti-entry direction, the first taper portion 71 presses the end portion of the enlarged diameter portion 41 on the anti-entry direction side toward the approach direction side, and the end portion on the approach direction side is pressed by the second taper. The portion 72 presses on the side in the anti-entry direction. As a result, the enlarged diameter portion 41 is sandwiched between the first tapered portion 71 and the second tapered portion 72, and the substantially central portion in the direction along the approach direction of the enlarged diameter portion 41 is pushed outward in the radial direction of the main body portion 2. Will be. In the present embodiment, the diameter-expanded portion 41 is enlarged in the radial direction of the main body portion 2 from the initial state shown in FIGS. 1 and 2, so that the diameter-expanded portion 41 is brought into close contact with the inner surface of the pipeline to seal the pipeline. it can. That is, the movable range of the operating portion 5 is a range in which the diameter-expanded portion 41 expands radially outward from the state before the operation, preferably a range in which the diameter-expanded portion 41 can be brought into close contact with the inner surface of the pipeline to which the seal plug device 1 is mounted. Just set it.

Subsequently, a method of sealing the opening at the end of the conduit using the seal plug device 1 will be described with reference to FIGS. 4 and 5. This embodiment will be described along with the original rearranging work using the seal plug device 1 in order to reduce the protrusion from the pipeline P in the service team S attached to the pipeline P originally arranged. To do. The work process shown in FIGS. 4 and 5 is an example of the pipeline sealing method according to the present invention.
4 (a) and 4 (b) are schematic cross-sectional views showing a process of attaching the seal stopper device 1 to the service team S in the original rearranging work. 5 (a) to 5 (c) are schematic cross-sectional views showing a pressure adjusting step and a sealing step in the original rearranging work. In the present embodiment, the service illustrated is a service that greatly protrudes from the pipeline P in order to prevent problems even if the pipeline P is re-buried underground after appropriate maintenance and management of the pipeline P. This is the original rearranging work for removing most of the protruding portion from the pipeline P of Qi S.

First, a hole to be sealed by using the seal plug device 1 according to the present embodiment will be described. For example, the service team S is fused to the peripheral surface of the pipeline P through which a fluid such as gas flows. At this time, no opening is formed on the peripheral surface of the pipeline P, and the conduit P and the service team S are not communicated with each other. The service team S in the present embodiment has a built-in hole saw and rotationally drives the hole saw to perforate the peripheral surface of the pipeline P. As a result, as shown in FIG. 4A, a through hole O is provided in the portion of the pipeline P where the service team S is erected.
The service team S is an example of a pipe line to be sealed in the present invention. Furthermore, the pipeline P is an example of the first pipeline in the pipeline of the present invention, and the service team S is an example of the second pipeline in the pipeline of the present invention.

In the present embodiment, the through hole O formed by the hole saw is sealed by the seal plug device 1. In order to seal the through hole O, first, the seal plug device 1 is moved in the service team S to the joint portion between the pipeline P and the service team S. In the state shown in FIG. 2, that is, before the operation unit 8 is operated and before the operation unit 5 is operated, the enlarged diameter portion 41 has a diameter larger than the outer diameter of the main body portion 2 and the inner diameter of the service team S. There is. As a result, the seal plug device 1 is substantially locked to the inner surface of the service team S before the operating portion 5 is activated. Further, while the seal plug device 1 is being introduced into the service team S and until the claw portion 42 expands in diameter in the pipeline P, rattling of the posture of the seal plug device 1 is suppressed, and at the same time, rattling of the posture of the seal plug device 1 is suppressed. It is possible to prevent the seal plug device 1 from falling to the pipeline P side. Therefore, the seal plug device 1 can be stably attached to the pipeline to be sealed by the enlarged diameter portion 41.

As for the movement of the seal plug device 1 in the service team S, as shown in FIG. 4A, the claw portion 42 moves from the through hole at the joint portion between the pipeline P and the service team S to the inside of the pipeline P. Stop when entering. As shown in FIG. 4A, the position where the movement of the seal plug device 1 is completed is preferably adjusted to a position where a gap is provided between the claw portion 42 and the inner surface of the pipeline P. This gap is effective when the operation unit 8 described later is operated.

When the seal plug device 1 moves to the vicinity of the pipeline P in the service team S, or after the movement is completed, the portion on the side opposite to the seal plug device 1 of the service team S is cut and removed. As a result, the distance from the end of the service team S to the seal stopper device 1 is reduced, so that various jigs and tools can be easily inserted into the service team S and the seal stopper device 1, and the seal stopper device 1 can be easily inserted. A series of operations such as a sealing operation of the service team S using the above, a subsequent sealing operation, and a gas leak inspection operation are facilitated. The opening newly formed by cutting the service team S is referred to as a cutting opening C.
However, if the leakage of gas or the like from the service team S and the pipeline P to be sealed using the seal plug device 1 can be suppressed, the service team S before inserting the seal plug device 1 into the service team S A part may be cut to form a cut opening C.

Subsequently, as shown in FIG. 4B, the operation jig J is inserted from the cutting opening C of the service team S, and the tip end portion of the operation jig J is inserted into the operation recess 10 of the seal stopper device 1. Fit. Further, by rotating the operation jig J about its axis, as shown in FIG. 4B, the operating portion 5 moves in the counter-entry direction, so that the first tapered portion 71 and the second tapered portion 71 and the second The enlarged diameter portion 41 pressed against the tapered portion 72 expands in diameter outward in the radial direction of the main body portion 2. As a result, the enlarged diameter portion 41 comes into close contact with the inner surface of the service team S.

At this time, as the amount of movement of the operating portion 5 in the counter-entry direction increases, the force with which the enlarged diameter portion 41 is pressed against the inner surface of the service team S increases. Since the diameter-expanded portion 41 is made of an elastic material, the diameter-expanded portion 41 is deformed so as to strongly adhere to the inner surface of the service team S while expanding the contact area. As a result, the airtightness and the liquidtightness are improved, and good sealing performance can be ensured by the enlarged diameter portion 41. When the state shown in FIG. 4B is reached, the next step is to completely seal the service team S shown in FIG.

The claw portion 42 also moves to the anti-entry direction side as the operating portion 5 moves to the anti-entry direction side by the operation of the operation unit 8 shown in FIG. 4 (b). In the present embodiment, when the moved claw portion 42 comes into contact with the inner surface of the pipeline P as shown in FIG. 4 (b), the operation of the operation portion 8 is completed. By deriving in advance the position of the operating portion 5 in which the enlarged diameter portion 41 realizes good sealing performance with respect to the service team S, the operating amount of the operating portion 8 required for it, the moving amount of the operating portion 5, and FIG. The size of the gap between the claw portion 42 shown in (a) and the inner surface of the pipeline P can be calculated back.

As shown in FIG. 4B, the claw portion 42 projects in the pipeline P larger than the inner diameter of the main body 2, the service team S, and the diameter of the through hole O, so that the main body portion is affected by the pressure in the pipeline P or the like. Even if 2 tries to move to the opposite side of the approach direction, the claw portion 42 will function as a stopper. That is, the claw portion 42 can suppress the displacement of the main body portion 2 in the anti-entry direction side (particularly, the pull-out movement accompanied by the pop-out detachment from the service team S). Therefore, it is preferable because an accident such as inadvertent detachment from the conduit P and the service team S of the seal plug device 1 is unlikely to occur.
Even after the movement of the operating portion 5 by the operation of the operating portion 8 is completed and the gap between the claw portion 42 and the inner surface of the pipeline P remains, the main body portion 2 by the claw portion 42 The function as a stopper is feasible.

Since the seal stopper device 1 is a temporary stopper of the service team S, the work of completely sealing the cutting opening C of the service team S is subsequently performed. To do this, the pressure in the conduit P is reduced, as shown in FIG. 5 (a). This depressurization operation is carried out in order to normally perform the next step, the fusion of the sealing lid 13 to the cutting opening C. Specifically, as described above with reference to FIG. 2, the seal plug device 1 has a relief valve 31 and a check valve 32 as valve bodies that open valves in only one direction, and the valve opening directions are opposite to each other. It is arranged so as to be. In the present embodiment, the valve opening direction of the relief valve 31 is from the approach direction side to the anti-entry direction side, that is, from the pipeline P to the service team S. Further, the valve opening direction of the check valve 32 is from the counter-entry direction side to the approach direction side, that is, the direction from the service team S to the pipeline P.

As the check valve 32 in the present embodiment, a valve body that can be forcibly opened when pressed by the rod-shaped valve opening tool A is used. By opening the check valve 32 with the valve opening tool A, the pressure in the pipeline P is reduced when the pressure inside the pipeline P is higher than that on the counter-entry direction side of the seal plug device 1, and the pressure in the pipeline P is reduced in the anti-entry direction. It can be the same pressure as the side. This forced valve opening step is particularly effective when the pressure in the pipeline P is higher than the normal pressure, but not high enough to open the relief valve 31.

Next, as shown in FIG. 5B, the same resin sealing lid 13 is attached to the cutting opening C of the resin service team S. The sealing lid 13 is fixedly attached to the cutting opening C by fusion. That is, in the present embodiment, the sealing lid 13 is a main plug for maintaining the airtight state in the pipeline P, and the sealing plug device 1 functions as a temporary plug for safely attaching the sealing lid 13. In this embodiment, in order to improve the airtightness, a sealing lid 13 having a convex portion inserted into the service team S from the cutting opening C is adopted.

The region between the sealing lid 13 and the sealing stopper device 1 (hereinafter referred to as "first region S1") in the service team S is the insertion of a convex portion when the sealing lid 13 is attached and the sealing lid. Due to the thermal expansion during fusion of 13, the pressure becomes relatively higher than the region in the pipeline P (hereinafter, referred to as “second region S2”). During the mounting process of the sealing lid 13, the check valve 32 is opened so that the pressure of the first region S1 and the pressure of the second region S2 become the same.

Since the forced check valve 32 has undergone the valve opening step shown in FIG. 5 (a), the second check valve 32 is opened when the check valve 32 is opened by attaching the sealing lid 13 shown in FIG. 5 (b). The backflow of gas from the region S2 to the first region S1 can be suppressed or reduced. That is, by making the first region S1 and the second region S2 the same pressure by the forced valve opening step of the check valve 32, the absolute values of the first region S1 and the second region S2 are compared with the case where the pressure is not equalized. In particular, the pressure difference between the first region S1 and the second region S2 can be eliminated as much as possible. As a result, it can be expected that the first region S1 has a higher pressure than the second region S2 during the fusion process of the sealing lid 13, and the pressure averaged in the second region S2 has a low absolute value. Backflow of gas from the second region S2 to the first region S1 when the check valve 32 is opened at the time of fusion is unlikely to occur.
When the gas flows back, the sealing lid 13 that was about to be fused may be blown off by the gas pressure and separated from the cutting opening C of the service team S. By using the seal stopper device 1 according to the present embodiment, the above-mentioned backflow is unlikely to occur, so that a safe and stable fusion step can be executed. Further, if the gas flows back to the first region S1 when the sealing lid 13 is fused to the service team S, fine voids may be generated in the fused portion, and these voids are airtight by the sealing lid 13. It can lead to a decline. However, by using the seal plug device 1 according to the present embodiment, the backflow of gas is unlikely to occur, so that voids are unlikely to occur at the fused portion, and good airtightness can be ensured by the sealing lid 13.

Subsequently, in the step shown in FIG. 5C, a gas leak inspection is performed to confirm the airtightness of the sealing lid 13. When the check valve 32 is opened during the process shown in FIG. 5 (b), the pressure in the first region S1 and the second region S2 becomes the same, but in the leak inspection process, gas is contained in the pipeline P. The second region S2 is forcibly made higher than the first region S1 by press-fitting. When the relief valve 31 of the seal plug device 1 exceeds the operating pressure due to the press-fitting of the gas, the valve opens, so that the gas flows from the second region S2 to the first region S1. At this time, the airtightness of the sealing lid 13 can be confirmed by monitoring the presence or absence of gas leakage from the sealing lid 13. If the sealing lid 13 is attached to the service team S with normal airtightness, the inflow of gas from the second region S2 to the first region S1 stops when both regions have the same pressure. You can leave it alone.

If no gas leak is detected in the gas leak inspection step, the original arrangement work of the pipeline P is completed. As described above, the above-mentioned work is completed in a state where the pipeline P maintains the airtightness before the service team S is attached, and there is no problem even if the normal gas flow in the pipeline P is resumed.

As described above, the seal plug device 1 is provided with two valve bodies, and the valve opening directions thereof are different from each other, whereby suitable preparation for sealing the pipeline, realization of reliable sealing of the pipeline, and Accurate and simple gas leak inspection becomes possible.

In the above-described embodiment, the diameter-expanded portion 41 and the claw portion 42 are used as the regulating portions, but in the present invention, for example, a screw portion that can be screwed into a pipeline such as a service chee in which an internal screw is formed. May be provided on the anti-entry direction side or the approach direction side of the enlarged diameter portion. In other words, by forming a threaded portion on the peripheral side surface of the main body portion, the diameter-expanded portion is expanded to the target position while being screwed in the service team, and the conduit is sealed. Is possible. As a result, the regulating portion moves the main body portion to the anti-entry direction side and the approach direction side depending on the screwed state of the screw portion with respect to the pipeline and the close contact state of the enlarged diameter portion with the pipeline as in the above embodiment. Can be suppressed even more reliably.

As described above, the basic embodiment and the modification of the seal stopper device according to the present invention have been described. As shown in FIGS. 4 and 5, the seal stopper device 1 is used as a temporary stopper in the original arrangement work of the service team, but in the present invention, the work related to various pipes as long as the object of the present invention is achieved. Can be used for. In addition to the above work, when the pipeline P is a main branch pipe for distributing gas, for example, and the service team S is a branch pipe for distributing gas to each household or the like via, for example, a service team or an appropriate joint. If there is a request to stop the gas flow in one of the plurality of branch pipes and maintain the stopped state, the branch pipe can be rearranged by using the seal plug device 1 or the like. .. Further, the seal plug device 1 can be adopted as a temporary plug applied to other fluids other than gas.

Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the essay and the drawings which form a part of the disclosure of the present invention according to this embodiment. That is, it should be added that all other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are of course included in the scope of the present invention.

1: Seal plug device, 2: Main body, 31: Relief valve, 32: Check valve, 4: Regulatory part, 41: Enlarged part, 42: Claw part, 5: Acting part, 6: Lid part, 71: No. 1 taper part, 72: 2nd taper part, 8: operation part, 9: holding part, 10: operation recess, 11: external thread part, 12: internal thread part, 13: sealing lid, J: operation jig , S: Service Chi, P: Pipeline, O: Opening, C: Cutting Opening, A: Valve Opening Tool, S1: First Area, S2: Second Area

Claims (6)

A seal plug device installed inside a pipeline in which a sealing lid is fixed to an opening at one end.
A main body whose axis is arranged substantially parallel to the axis of the pipeline when mounted in the pipeline.
A first valve body and a second valve body provided on the main body and opened in only one direction when a specific pressure is applied, and
The main body is provided with a regulating portion that regulates the displacement of the main body to the side opposite to the approaching direction side in the pipeline.
The first valve body and the second valve body are provided in opposite directions so that the valve opening direction is directed to the approach direction side or the counter-entry direction side .
The first valve body is
By opening the valve, the fluid is transferred from the second region, which is a region in the pipeline, to the first region, which is the region between the seal plug device and the sealing lid attached to the cut pipeline. Inflow,
The second valve body is
By opening the valve, the pressure in the second region is reduced, and the pressure in the first region and the pressure in the second region become the same.
Seal stopper device. The operating pressures of the first valve body and the second valve body are different.
The seal stopper device according to claim 1. The first valve body or the second valve body can be forcibly opened from the counter-entry direction side.
The seal stopper device according to claim 1 or 2. The regulation unit has a first regulation unit and a second regulation unit.
The first regulating unit regulates the displacement of the main body portion to the approaching direction side and the anti-entrying direction side.
The second regulating unit regulates the displacement of the main body portion toward the counter-entry direction.
The seal stopper device according to any one of claims 1 to 3. The pipeline has a first pipeline and a second pipeline branching from the first pipeline.
With the main body inserted from the second pipeline toward the first pipeline,
The end portion of the main body portion on the approach direction side protrudes inside the first pipeline from the branch portion between the first pipeline and the second pipeline, and at the same time.
The regulating portion expands in diameter larger than the inner diameter of the second pipeline in at least one of the first pipeline and the second pipeline.
The seal stopper device according to any one of claims 1 to 4. This is a pipeline sealing method in which a conduit in which a sealing lid is fixed to an opening at one end is sealed using a sealing plug device.
The seal stopper device is
A main body whose axis is arranged substantially parallel to the axis of the pipeline when mounted in the pipeline.
A first valve body and a second valve body provided on the main body and opened in only one direction when a specific pressure is applied, and
The main body is provided with a regulating portion that regulates the displacement of the main body to the side opposite to the approaching direction side in the pipeline.
The first valve body and the second valve body are provided in opposite directions so that the valve opening direction is directed to the approach direction side or the counter-entry direction side .
The first valve body is
By opening the valve, the fluid is transferred from the second region, which is a region in the pipeline, to the first region, which is the region between the seal plug device and the sealing lid attached to the cut pipeline. Inflow,
The second valve body is
By opening the valve, the pressure in the second region is reduced, and the pressure in the first region and the pressure in the second region become the same.
Pipeline sealing method.

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