JP2018162820A - Seal plug device and pipeline sealing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal plug device and a pipeline sealing method which can seal the opening of a pipeline end more reliably than the conventional one and are less likely to cause or do not deviate from the sealing position. SOLUTION: This is a seal plug device for sealing an opening of a pipeline, and has a main body whose axis is arranged substantially parallel to the axis of the pipeline when mounted in the pipeline, and a main body in the main body. A diameter-expanding portion provided on the peripheral side surface on the approaching direction side and having an elastic body capable of expanding the diameter in the radial direction of the main body from the opposite approaching direction side to the approaching direction side. A seal plug device provided with a locking portion that is provided on the anti-entry direction side of the main body and can be locked to a pipeline. [Selection diagram] Fig. 3

Description

  The present invention relates to a sealing plug device and a pipe sealing method, and more particularly to sealing an opening at a pipe end more reliably as compared with the prior art, and a sealing plug device and a pipe that are less likely to or do not deviate from the sealing position. The present invention relates to a road sealing method.

  In order to ensure uniform airtightness of the pipe line to be sealed and to obtain good original arrangement workability, the plug body pressed against the inner surface of the pipe line, and to spread in the radial direction in a wide area in the pipe line There is known an original arrangement sealing plug device including a lock pin pivotally supported on the side wall and provided with a tapered surface on the side surface of the plug main body so as to facilitate an entry operation in a pipe line (Patent Document 1). reference).

Patent No. 4036721

  However, the conventional seal plug device has room for improvement in the seal form and the like.

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

  As means for solving the above-mentioned problems, a sealing plug device according to the present invention is a sealing plug device mounted inside a pipe line in which a sealing lid is fixed to an opening at one end, and is mounted in the pipe line. Sometimes, a main body part whose axis is arranged substantially parallel to the axis of the pipe line, a first valve body and a second valve body which are provided in the main body part and open only in one direction when a specific pressure is applied, and a main body And a restricting portion for restricting displacement of the main body portion in the opposite direction direction opposite to the entry direction side in the conduit, and the first valve body and the second valve body are opened. The valve directions are provided opposite to each other so that the valve direction is directed to the approach direction side or the counter approach direction side.

  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 counter approaching direction side.

  In the sealing plug device according to the present invention, the restricting portion includes a first restricting portion and a second restricting portion, and the first restricting portion restricts displacement of the main body portion toward the approach direction side and the counter approach direction side. The second restricting portion preferably restricts the displacement of the main body portion in the opposite direction.

  In the sealing plug device according to the present invention, the pipe has a first pipe and a second pipe branched from the first pipe, and the body portion is directed from the second pipe to the first pipe. In the inserted state, the end portion of the main body portion in the direction of entry protrudes to the inside of the first pipe line from the branch part of the first pipe line and the second pipe line, and the restricting part is the first pipe. It is preferable that the diameter is larger than the inner diameter of the second pipe in at least one of the inside of the road and the second pipe.

  As another means for solving the above-described problem, a pipe line sealing method according to the present invention is a pipe line sealing method for sealing a pipe line using a seal plug device, and the seal plug device is a pipe A main body part whose axis is arranged substantially parallel to the axis of the pipe line, and a first valve body and a second valve which are provided in the main body part and open only in one direction when a specific pressure is applied. A valve body, and a restriction portion that is provided in the main body portion and restricts the displacement of the main body portion in the opposite direction side opposite to the entry direction side in the conduit, and includes a first valve body and a second valve body. The valve bodies are provided in directions opposite to each other so that the valve opening direction is directed to the approach direction side or the counter-entry direction side.

  In the present invention, by providing two valve bodies with the valve opening directions opposite to each other, it is possible to reduce the pressure in the pipeline for suppressing the gas backflow before attaching the sealing lid to the opening of the pipeline. Can be done safely. Furthermore, since it becomes possible to suppress the formation of a gap or the like at the fusion site due to the backflow of gas at the time of fusion of the sealing lid, a seal plug device that can reliably suppress fluid leakage as compared with the prior art. Can be provided.

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

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

  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 restriction portion 4.

  The main body 2 has a substantially cylindrical shape, and the axis is arranged substantially parallel to the axis of the pipe when mounted in the pipe. The main body 2 has two main parts, specifically, an operating part 5 and a lid part 6.

When the seal plug device 1 is mounted in the pipeline to be sealed, the actuating unit 5 enters the seal plug device 1 into the pipeline in the direction of entry (the back side in FIG. 1, the bottom side in FIG. 2). It is a part provided in. The operation part 5 is a part that is displaced along the axis of the main body part 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 portions 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 6 is a part provided on the opposite side of the approach direction side (the front side in FIG. 1 and the upper side in FIG. 2). The lid 6 is a substantially disk-shaped member, and when attached to the pipeline, the lid 6 is disposed on the opening side of the pipeline. In addition, the cover part 6 has the holding part 9 for holding the operation part 8 arrange | positioned in a substantially center part rotatably.
As shown in FIGS. 1 and 2, the lid portion 6 is provided with a plurality of through holes, and an operation portion 8, a relief valve 31, a check valve 32, and the like described later are inserted into the main body portion 2 from the through holes. Has been. 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 operation recess 10 is a recess for inserting and fitting an appropriate operation jig when sealing the pipe line using the seal plug device 1, and as shown in FIG. It is arranged to be exposed.
The operating portion 8 is held on the peripheral side surface where the external screw portion 11 is not provided so that the operating portion 8 does not move in the direction along the approaching direction and the counter approaching direction, and is rotatable about the axis of the operating portion 8. Held by the section 9.
The outer screw portion 11 is a screw thread provided on the approach direction side from the holding portion 9, and is formed on the inner screw portion 12 formed on the inner surface of the insertion hole provided in the substantially central portion on the counter approach direction side of the operation 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, and the respective valve opening directions are directed toward the entry 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 are respectively opened to the through hole of the lid portion 6 on the counter approaching direction side and the through hole of the operating portion 5 on the approaching direction side. Communication is possible. 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 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 gas pressure, for example, a relief valve 31 having an operating pressure of 0.1 to 0.3 Mpa and a check valve 32 having an operating pressure of 1 kPa or less can be used. However, the present invention is not limited to these operating pressures, and can be set as appropriate in view of the type of pipeline to be applied, the pressure of fluid flowing through the pipeline, and the like.

The restricting part 4 is provided in the main body part 2 and restricts the displacement of the main body part 2 in the opposite direction. In the present embodiment, the restricting portion 4 has an enlarged diameter portion 41 and a claw portion 42.
The enlarged diameter portion 41 is an example of a first restricting portion in the present invention, and the claw portion 42 is an example of a second restricting portion in the present invention.

  The enlarged diameter 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 difficult to be 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. Yes. The enlarged diameter portion 41 is provided so as to extend over 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 taper portion 71 formed of an inclined surface directed toward the entry direction side on the entry direction side of the peripheral side surface of the lid portion 6. The actuating part 5 has a second taper part 72 formed of an inclined surface directed toward the anti-entry direction side on the anti-advancing direction side of the peripheral side surface of the actuating part 5. The enlarged diameter portion 41 is disposed 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 restricts not only the anti-entry direction side but also the displacement of the main body 2 toward the approach direction side. Specifically, when the diameter-expanded portion 41 is increased in diameter, the main body portion 2 is in a substantially locked state in the pipe line, and displacement in the approach direction side and the counter-entry direction side is suppressed. The usage pattern and operation effect of the enlarged diameter 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 every 90 °, and as shown in FIG. 2, the claw portions 42 are provided closer to the approaching direction than the second taper portion 72 of the operating portion 5. The claw portion 42 is configured to be urged outward in the radial direction of the operating portion 5 by a coil spring built in a recess of the operating portion 5 that can accommodate the claw portion 42. Thereby, in an initial state shown in FIG. 1 and FIG. 2, the claw portion 42 is in a protruding state on the radially outer side of the main body portion 2.

  The claw portion 42 restricts the main body portion 2 from coming off in the opposite direction. A specific usage pattern and operational effects of the claw portion 42 will be described later with reference to FIGS. 3 and 4. In FIG. 2, the claw portion 42 is not shown in the cut surface of FIG. 1, and the protruding state, the protruding position, and the like from the main body portion 2 are indicated only by the outline.

  FIG. 3 shows a sealing plug device 1 that is operated to make the pipe line sealable. In order to make the pipe line sealable, an operation jig J is inserted into the operation recess 10 of the operation section 8 as shown in FIG. By this rotation operation, the operation unit 8 rotates about the axis. Since the operation unit 8 is immovable in the direction along the approach direction and the counter-entry direction by the holding unit 9, only the rotation operation occurs.

  When the operation unit 8 rotates, the operation unit 5 is displaced in a direction along the approach direction and the anti-entry direction by the inner screw portion 12 of the operation unit 5 that is screwed into the outer screw portion 11 of the operation unit 8. Therefore, the operation unit 5 can be displaced in the anti-entry direction by rotating the operation unit 8 in a specific direction (clockwise direction in the present embodiment).

  When the actuating portion 5 is displaced along the anti-entry direction, the first taper portion 71 presses the end portion on the anti-entry direction side of the enlarged diameter portion 41 toward the approach direction side, and the end portion on the approach direction side is second tapered. The part 72 presses in the opposite direction side. 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 enlarged diameter portion 41 expands in the radial direction of the main body portion 2 from the initial state shown in FIGS. 1 and 2, thereby closely contacting the inner surface of the pipeline and sealing 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 to the radially outer side of the main body portion 2 from the pre-operation state, preferably a range that can be in close contact with the inner surface of the pipe line to which the seal plug device 1 is attached. Set it.

Next, a method for sealing the opening at the pipe end using the seal plug device 1 will be described with reference to FIGS. 4 and 5. The present embodiment will be described along with the original arrangement work using the sealing plug device 1 in order to reduce the protrusion from the pipe P in the service chi S that is attached to the pipe P that has been originally provided. To do. 4 and 5 is an example of the pipe line sealing method according to the present invention.
4 (a) and 4 (b) are schematic cross-sectional views showing a process of attaching the sealing plug device 1 to the service chi S in the original arrangement work. FIGS. 5A to 5C are schematic cross-sectional views showing a pressure adjustment step and a sealing step in the original arrangement work. In the present embodiment, a service that protrudes greatly from the pipe P in order to make it difficult to cause a problem even if the pipe P is buried again underground after appropriate maintenance management of the pipe P is performed. This is the original rearranging work for removing most of the projecting portions from the pipe P of Qi S.

First, the hole sealed using the sealing plug apparatus 1 which concerns on this embodiment is demonstrated. For example, the service chi S is fused to the peripheral surface of the pipe P through which a fluid such as gas flows. At this time, no opening is formed in the peripheral surface of the pipe P, and the pipe P and the service chi S are not communicated. The service chi S in the present embodiment incorporates a hole saw and rotates the hole saw to perforate the peripheral surface of the pipe P. Thereby, as shown to Fig.4 (a), the through-hole O is provided in the site | part in which the service chi S in the pipe line P was erected.
The service chi 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 chi 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 sealing plug device 1 is moved in the service chi S to the joint portion between the pipe line P and the service chi S. In the state shown in FIG. 2, i.e., before the operation unit 5 is operated before the operation unit 8 is operated, the enlarged diameter portion 41 has a diameter larger than the outer diameter of the main body 2 and the inner diameter of the service chi S. Yes. As a result, the seal plug device 1 is in a substantially locked state with respect to the inner surface of the service chi S before the operation portion 5 operates. Furthermore, while the seal plug device 1 is being entered in the service chi S and until the claw portion 42 is expanded in the pipe P, the backlash of the posture of the seal plug device 1 is suppressed, It is possible to suppress the sealing plug device 1 from dropping to the pipeline P side. Therefore, the seal plug device 1 can be stably attached to the pipe line to be sealed by the enlarged diameter portion 41.

  In addition, as shown in FIG. 4A, the claw portion 42 moves from the through-hole at the joint portion between the pipe P and the service chi S to the inside of the pipe P, as shown in FIG. Stop while entering. The position at which the movement of the sealing 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 pipe P as shown in FIG. This gap is effective when an operation unit 8 described later is operated.

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

  Subsequently, as shown in FIG. 4B, the operation jig J is inserted from the cutting opening C of the service chi S, and the tip of the operation jig J is inserted into the operation recess 10 of the seal plug device 1. Fit. Further, by rotating the operation jig J around its axis, as shown in FIG. 4 (b), the operating portion 5 moves in the opposite direction side so that the first tapered portion 71 and the second tapered portion 71 are moved. The diameter-expanded portion 41 pressed by the taper portion 72 expands outward in the radial direction of the main body portion 2. Thereby, the enlarged diameter part 41 adheres with respect to the inner surface of the service chi S.

  At this time, the force with which the diameter-expanded portion 41 is pressed against the inner surface of the service chi S increases as the amount of movement of the operating portion 5 in the opposite direction direction increases. Since the enlarged-diameter portion 41 is formed of an elastic material, the enlarged-diameter portion 41 is deformed and comes into close contact with the service chi S while increasing the contact area with the inner surface. Thereby, the air tightness and the liquid tightness are improved, and a good sealing property by the enlarged diameter portion 41 can be secured. If it will be in the state shown in FIG.4 (b), it will move to the process of sealing the service chi shown in FIG. 5 next completely.

  In addition, the nail | claw part 42 also moves to a counter approach direction side with the movement to the counter approach direction side of the action | operation part 5 by operation of the operation part 8 shown in FIG.4 (b). In the present embodiment, the operation of the operation portion 8 is completed when the claw portion 42 that has moved contacts the inner surface of the pipe P as shown in FIG. By deriving in advance the position of the actuating part 5 where the diameter-expanding part 41 realizes a good sealing property with respect to the service chi S, the operation amount of the operation part 8, the movement amount of the actuating part 5 necessary for that, and FIG. The size of the gap between the claw portion 42 and the inner surface of the pipe P shown in (a) can be calculated backward.

As shown in FIG. 4 (b), the claw portion 42 projects larger than the inner diameter of the main body 2, the service chi S and the diameter of the through hole O in the pipe P, so The claw portion 42 functions as a stopper even if 2 moves toward the opposite direction. That is, the claw part 42 can suppress the displacement of the main body part 2 in the anti-entry direction side (particularly, the movement away from the service chi S with the detachment). Therefore, an accident such as inadvertent detachment from the pipe P and the service chi S of the seal plug device 1 is unlikely to occur, which is preferable.
Even after the movement of the operating portion 5 by the operation of the operation portion 8 is completed, even when the gap between the claw portion 42 and the inner surface of the pipe P remains, the main body portion 2 by the claw portion 42. The function as a stopper can be realized.

  Since the sealing plug device 1 is a temporary plug of the service chi S, the operation subsequently moves to completely sealing the cutting opening C of the service chi S. For this purpose, as shown in FIG. 5A, the pressure in the pipe P is reduced. This depressurization operation is executed in order to normally perform fusion with the cutting opening C of the sealing lid 13 as the next step. Specifically, as described above with reference to FIG. 2, the seal plug device 1 has the relief valve 31 and the check valve 32 as valve bodies that open only in one direction, and the valve opening directions are opposite to each other. It is arranged to become. In this embodiment, the valve opening direction of the relief valve 31 is the direction from the entry direction side to the counter entry direction side, that is, the direction from the pipeline P toward the service chi S. Further, the valve opening direction of the check valve 32 is the direction from the opposite entry direction side to the entry direction side, that is, the direction from the service chi S to the pipe line P.

  As the check valve 32 in this embodiment, a valve body that can be forcibly opened when pressed by a rod-shaped valve opening tool A is used. When the check valve 32 is opened by the valve opening tool A, the pressure in the pipe P is reduced when the pressure in the pipe P is higher than that of the seal plug device 1 in the counter approach direction, and the counter approach direction Can be the same pressure as the side. The forced opening process is particularly effective when the pressure in the pipe P is higher than the normal pressure but not high enough to open the relief valve 31.

  Next, as shown in FIG. 5B, the resin sealing lid 13 is similarly attached to the cutting opening C of the service tee S made of resin. The sealing lid 13 is fixedly attached to the cutting opening C by fusion. That is, in this embodiment, the sealing lid 13 is a main plug for maintaining an airtight state in the pipe P, and the sealing plug device 1 functions as a temporary plug for mounting the sealing lid 13 safely. In the present embodiment, a sealing lid 13 having a convex portion that is inserted from the cutting opening C into the service chi S is employed to improve airtightness.

  The area between the sealing lid 13 and the sealing plug device 1 in the service chi S (hereinafter referred to as “first area S1”) is the insertion of a convex portion when the sealing lid 13 is attached, and the sealing lid Due to the thermal expansion at the time of fusing 13, the pressure is relatively higher than the region in the pipe P (hereinafter referred to as “second region S <b> 2”). When the sealing lid 13 is attached, the check valve 32 is opened so that the first region S1 and the second region S2 have the same pressure.

Since the forced opening process of the check valve 32 shown in FIG. 5A is performed, the second time when the check valve 32 is opened by mounting the sealing lid 13 shown in FIG. 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 have the same pressure by the forced valve opening process 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 same pressure is not obtained. In particular, the state in which the second region S2 is at a higher pressure than the first region S1 can be eliminated as much as possible. As a result, the first region S1 can be expected to have 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. When the check valve 32 is opened at the time of fusion, it is difficult to cause a backflow of gas from the second region S2 to the first region S1.
When the gas flows backward, there is a possibility that the sealing lid 13 that was about to be fused is blown off by the gas pressure and detached from the cutting opening C of the service chi S. The use of the sealing plug device 1 according to the present embodiment makes it difficult for the reverse flow to occur, so that a safe and stable fusion process can be performed. Further, if the gas flows backward to the first region S1 when the sealing lid 13 is fused to the service chi S, there is a possibility that a fine gap is generated in the fused portion. This gap is airtight by the sealing lid 13. It can lead to a decline. However, the use of the sealing plug device 1 according to the present embodiment makes it difficult for the gas backflow to occur, so that a gap in the fused portion hardly occurs, and good airtightness by the sealing lid 13 can be ensured.

  Subsequently, in the process illustrated in FIG. 5C, a gas leakage inspection is performed to confirm the airtightness of the sealing lid 13. Although the first region S1 and the second region S2 are at the same pressure by opening the check valve 32 during the process shown in FIG. 5B, the gas in the pipe line P is in the leak inspection process. The second region S2 is forcibly set to a pressure higher than that of the first region S1. Since the valve is opened when the relief valve 31 of the seal plug device 1 exceeds the operating pressure due to the press-fitting of the gas, 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. In addition, if the sealing lid 13 is attached to the service chi S with normal airtightness, the flow of gas from the second region S2 to the first region S1 stops when both regions are at the same pressure. You can leave it alone.

  If no gas leak is detected in the gas leak inspection process, the original arrangement work of the pipeline P is completed. As described above, the above operation is completed in a state in which the pipeline P is maintained in the hermetic state before the service chi S is attached, and there is no problem even if the normal circulation of gas in the pipeline P is resumed.

  As described above, the sealing plug device 1 includes two valve bodies and has different valve opening directions, so that suitable preparation for sealing the pipeline, realization of reliable sealing of the pipeline, and Accurate and simple gas leakage inspection is possible.

  In the above-described embodiment, the enlarged diameter portion 41 and the claw portion 42 are employed as the restricting portion. However, in the present invention, for example, a screw portion that can be screwed into a pipe such as a service chi formed with an inner screw. May be provided on the anti-advancing direction side or the entering direction side of the enlarged diameter portion. In other words, by forming a screw part on the peripheral side surface of the main body part, it is rotated and moved to the target position while screwing in the service team, and the diameter-enlarged part is expanded at the target position to seal the pipeline. Is possible. As a result, the restricting portion moves the main body portion in the anti-entry direction side and the approaching direction side depending on the screwed state of the screw portion with respect to the conduit and the close contact state of the enlarged diameter portion similar to that in the above embodiment. Can be more reliably suppressed.

  As described above, the basic embodiment and the modification of the seal plug device according to the present invention have been described. As shown in FIGS. 4 and 5, the seal plug device 1 is used as a temporary plug in the original arrangement work of the service team. However, in the present invention, as long as the object of the invention is achieved, operations related to various pipes Can be used. In addition to the above work, when the pipe P is a main branch through which gas is circulated, for example, and the service chi S is a branch pipe that distributes gas to each household etc. via a service chi or an appropriate joint, for example. In addition, if there is a request to stop the gas flow in one of the plurality of branch pipes and maintain the stopped state, the original arrangement work of the branch pipes can be performed using the seal plug device 1 or the like. . The seal plug device 1 can be used as a temporary plug applied to other fluids besides gas.

  As mentioned above, although embodiment which applied the invention made | formed by this inventor was described, this invention is not limited by the description and drawing which make a part of indication of this invention by this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  1: Seal plug device, 2: Main body part, 31: Relief valve, 32: Check valve, 4: Restriction part, 41: Expanded part, 42: Claw part, 5: Actuating part, 6: Cover part, 71: No. 1 taper section, 72: second taper section, 8: operation section, 9: holding section, 10: operation recess, 11: outer thread section, 12: inner thread section, 13: sealing lid, J: operation jig , S: Service Q, P: Pipe, O: Opening, C: Cutting opening, A: Valve opening tool, S1: First area, S2: Second area

Claims (6)

A sealing plug device attached to the inside of a pipe line in which a sealing lid is fixed to an opening at one end,
A main body having an axis disposed substantially parallel to the axis of the pipe, when mounted in the pipe;
A first valve body and a second valve body which are provided in the main body and open only in one direction when a specific pressure is applied;
A regulation part that is provided in the main body part and regulates the displacement of the main body part in the opposite direction side opposite to the entry direction side in the pipeline;
The first valve body and the second valve body are provided in directions opposite to each other so that a valve opening direction is directed to the approach direction side or the counter approach direction side,
Seal plug device. The operating pressures of the first valve body and the second valve body are different.
The sealing plug device according to claim 1. The first valve body or the second valve body can be forcibly opened from the counter approaching direction side,
The sealing plug device according to claim 1 or 2. The restriction part has a first restriction part and a second restriction part,
The first restricting portion restricts displacement of the main body portion toward the approach direction side and the counter approach direction side,
The second restricting portion restricts displacement of the main body portion toward the anti-advancing direction;
The sealing plug device according to any one of claims 1 to 3. The pipe has a first pipe and a second pipe branched from the first pipe,
In a state where the main body portion is inserted from the second pipeline toward the first pipeline,
The end of the main body portion on the entry direction side protrudes to the inside of the first pipeline from the branch portion between the first pipeline and the second pipeline,
The restricting portion expands larger than the inner diameter of the second pipeline in at least one of the first pipeline and the second pipeline;
The sealing plug device according to any one of claims 1 to 4. A pipeline sealing method for sealing a pipeline in which a sealing lid is fixed to an opening at one end using a seal plug device,
The sealing plug device includes:
A main body having an axis disposed substantially parallel to the axis of the pipe, when mounted in the pipe;
A first valve body and a second valve body which are provided in the main body and open only in one direction when a specific pressure is applied;
A regulation part that is provided in the main body part and regulates the displacement of the main body part in the opposite direction side opposite to the entry direction side in the pipeline;
The first valve body and the second valve body are provided in directions opposite to each other so that a valve opening direction is directed to the approach direction side or the counter approach direction side,
Pipeline sealing method.