JP6900003B2 - 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 airtightness of the conventional seal stopper device.

Therefore, the problem to be solved by the present invention is a sealing plug device and a pipeline sealing method that seal the opening of the pipeline end more reliably than the conventional one and hardly or does not cause deviation from the sealing position. Is to provide.

As a means for solving the above-mentioned problems, the seal plug device according to the present invention is a seal plug that seals an opening of a pipeline having a first pipeline and a second pipeline branching from the first pipeline. In the main body portion of the device, the axis line is arranged substantially parallel to the axis line of the second pipeline when mounted in the approach direction from the second pipeline to the first pipeline, and the main body portion. A diameter-expanded portion provided on the peripheral side surface on the approach direction side from the second pipeline to the first pipeline and having an elastic body capable of expanding the diameter, and a counter-entry portion on the main body portion opposite to the approach direction side. A locking portion provided on the directional side and lockable to the pipeline, an operating portion provided on the approaching direction side of the main body portion, and one end portion of the operating portion on the approaching direction side are provided. The main body portion is provided with a tapered portion formed of an inclined surface toward the anti-entry direction side, and the main body portion is inserted from the second pipeline toward the first pipeline, and the main body portion is inserted in the approach direction. The end portion on the side protrudes inside the first pipeline from the branch portion between the first pipeline and the second pipeline, and the enlarged diameter portion has the operating portion on the anti-entry direction side. By moving to, it is pressed by the tapered portion and the diameter is expanded larger than the inner diameter of the second pipeline in the range from the inside of the first pipeline to the inside of the second pipeline, so that the diameter is increased along the circumferential direction of the opening. And stick together.

In the seal plug device according to the present invention, it is preferable that the locking portion can be screwed into the screw portion formed on the inner surface of the pipeline.

In the seal plug device according to the present invention, the main body has at least two valve bodies that open in only one direction when a specific pressure is applied, and one valve body and the other valve body are in the valve opening direction. Is preferably provided in opposite directions so as to face the approach direction side or the anti-entry direction side.

As another means for solving the above-mentioned problems, the pipeline sealing method according to the present invention includes a first pipeline and a second pipeline branching from the first pipeline by using a seal plug device. It is a pipeline sealing method for sealing the opening of a pipeline, and when the seal plug device is mounted in the approach direction from the second pipeline to the first pipeline, the axis line is the second. It has a main body portion arranged substantially parallel to the axis of the pipeline, and an elastic body provided on the peripheral side surface of the main body portion on the approach direction side from the second pipeline to the first pipeline and capable of expanding the diameter. On the diameter-expanded portion, the locking portion provided on the opposite side of the main body portion opposite to the approaching direction side and lockable to the pipeline, and the approaching direction side of the main body portion. It is provided with an actuating portion provided and a tapered portion provided at one end of the actuating portion on the approach direction side and formed of an inclined surface toward the anti-entry direction side, and the main body portion is provided with the second pipeline. In the state of being inserted toward the first pipeline, the end portion of the main body portion on the approach direction side of the first pipeline is more than the branch portion between the first pipeline and the second pipeline. In addition to projecting inward, the enlarged diameter portion is pressed by the tapered portion by moving the operating portion toward the counter-entry direction side, and extends from the inside of the first pipeline to the inside of the second pipeline. By expanding the diameter larger than the inner diameter of the second pipeline, the second pipeline is brought into close contact along the circumferential direction of the opening.

In the present invention, the expanded elastic body is formed large from the anti-entry direction side to the approach direction side, so that the opening of the pipeline bites into the enlarged diameter portion, so that it is more reliable than the conventional one. It is possible to provide a seal plug device capable of sealing the opening of the pipeline and preventing or preventing deviation from the sealing position due to the locking of the locking portion.

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 the 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. FIG. 6 is a schematic cross-sectional view showing a seal stopper device according to another embodiment of the present invention.

The seal plug device according to the present invention is used together with a main plug that can seal the opening of the pipeline by itself or a sealing lid that is attached to the opening at the end of the pipeline, and the seal plug device is installed in the pipeline. It can be used as any of the temporary plugs.
When the seal stopper device according to the present invention is used as the main stopper, it includes a main body portion, a diameter-expanded portion, and a locking portion. When the seal stopper device according to the present invention is used as a temporary stopper, it includes a main body portion, a diameter-expanded portion, a locking portion, and a valve body. In other words, the valve body is not essential for this plug.
The configuration and action / effect of each member will be described later together with specific embodiments shown in the drawings. In the embodiment shown in the drawing, the seal stopper device is used as a temporary stopper.

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 diameter-expanding portion 3, and a locking 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 three major portions, specifically, an operating portion 5, a lid portion 6, and a fixing portion 7.

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 (the back side in FIG. 1 and the 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 9 and the check valve 10 can be inserted and arranged. The relief valve 9 and the check valve 10 will be described later.

The lid portion 6 is a portion provided on the anti-entry direction side (front side in FIG. 1, 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.
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 9, the check valve 10, and the like, 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 9 and the check valve 10.

The fixing portion 7 is a portion sandwiched and arranged between the operating portion 5 and the lid portion 6. In particular, as shown in FIG. 2, the main body portion 2 is arranged in the order of the lid portion 6, the fixing portion 7, and the operating portion 5 from the anti-entry direction side to the approach direction side.
Like the lid portion 6, the fixing portion 7 has a plurality of through holes, and the operation portion 8, the relief valve 9, the check valve 10, and the like, which will be described later, are inserted and arranged in the through holes. The fixing portion 7 and the lid portion 6 are provided in a state of being fixed to each other. The fixing portion 7 has a holding portion 11 for rotatably holding the operating portion 8 arranged at a substantially central portion.

The operation unit 8 is a bolt-shaped member, and has an operation recess 12 at one end and an external screw portion 13 on the peripheral side surface of the other end.
The operating recess 12 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 13 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 11.
The external threaded portion 13 is a thread provided on the approaching direction side from the holding portion 11, and is formed on the inner threaded portion 14 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 9 and the check valve 10 are arranged so that the valve opening directions are opposite to each other. Specifically, the relief valve 9 and the check valve 10 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 9 and the check valve 10 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 anti-entry direction side and the through hole of the operating portion 5 on the approach direction side are respectively arranged. It is possible to communicate.
In this embodiment, as an example, a relief valve 9 having an operating pressure of 0.1 MPa and a check valve 10 having an operating pressure of 7 kPa are used. Depending on the pressure of the gas, for example, a relief valve 9 having an operating pressure of 0.1 to 0.3 Mpa may be used, and a check valve 10 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 diameter-expanding portion 3 is provided on the peripheral side surface of the main body portion 2 on the approaching direction side, and has an elastic body that can be expanded in the radial direction. Further, the diameter-expanded portion 3 is formed larger in the radial direction of the main body portion 2 from the anti-entry direction side to the approach direction side in a state where the elastic body is completely expanded in diameter. In other words, the enlarged diameter portion 3 is formed in a substantially funnel shape (hollow truncated cone shape). 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 modified by the fluid flowing in the pipeline, and the elastic body of the enlarged diameter portion 3 in the present embodiment uses an elastomer. There is.
The enlarged diameter portion 3 is provided across the peripheral side surface of the fixing portion 7 and the peripheral side surface of the operating portion 5, and the portion in contact with the fixing portion 7 is fixed.

The operating portion 5 has a tapered portion 15 formed of an inclined surface toward the anti-entry direction side at one end on the approach direction side. The diameter-expanded portion 3 is not fixed to the tapered portion 15 and is arranged in contact with the tapered portion 15.

The locking portion 4 is provided on the peripheral side surface of the lid portion 6 of the main body portion 2 and is a portion that can be locked with respect to the pipeline. The locking portion 4 in the present embodiment is formed as a screw-shaped portion, and is provided so as to be screwable with respect to the inner surface of the pipeline provided with the internal screw.
Further, as shown in FIGS. 1 and 2, the locking portion 4 is a fixed portion 7, a diameter expanding portion 3, and an operating portion in a state before sealing of the pipeline, in other words, in a state before expanding the diameter of the diameter expanding portion 3. It is formed larger than 5 on the radial outer side of the main body 2.

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 12 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 11, 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 of the operating portion 5 screwed to the external screw portion 13 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 tapered portion 15 presses the end portion of the enlarged diameter portion 3 on the approach direction side toward the anti-entry direction. As a result, the portion of the enlarged diameter portion 3 that comes into contact with the tapered portion 15 is displaced toward the counter-entry direction, so that the end portion of the enlarged diameter portion 3 on the approach direction side expands outward in the radial direction of the main body portion 2. It becomes. In the present embodiment, the opening of the conduit end can be sealed by expanding the diameter-expanded portion 3 from the locking portion 4 in the radial direction of the main body portion 2. That is, the movable range of the operating portion 5 may be set to a range in which the enlarged diameter portion 3 expands radially outward of the main body portion 2 from the locking portion 4.

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. In the present embodiment, the original rearranging work using the seal plug device 1 in order to reduce the protrusion from the pipeline P of the service team S attached to the pipeline P will be described. 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.

The attachment of the seal stopper device 1 to the pipeline will be described with reference to FIG. As shown in FIG. 4A, the seal plug device 1 is moved within the service team S to the joint portion between the pipeline P and the service team S. Since an internal screw is formed on the inner surface of the service team S as shown in FIG. 4, the screw portion formed as the locking portion 4 of the seal plug device 1 and the internal screw of the service team S are screwed together. The seal plug device 1 is locked. The seal stopper device 1 can advance and retreat in the service team S while maintaining the screwed state by rotating the entire seal stopper device 1 around the axis of the seal stopper device 1.

As for the movement of the seal plug device 1 in the service team S, as shown in FIG. 4A, the approach-direction side ends of the main body 2 and the diameter-expanded portion 3 enter the inside through the opening of the conduit P. Stop in the state of. As for the amount of movement of the seal stopper device 1, the portion of the diameter-expanded portion 3 whose diameter is larger than the inner diameter of the service team S and the opening O of the pipeline P by the operation of the seal stopper device 1 is the opening O of the pipeline P. It is better to adjust it so that it covers the position. 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 pipeline P 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.

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 12 of the seal stopper device 1. Fit. Further, by rotating the operation jig J about its axis, as shown in FIGS. 3 and 4B, the operating portion 5 moves in the counter-entry direction side and presses against the tapered portion 15. The diameter-expanded portion 3 is expanded in the radial direction of the main body portion 2. As a result, the enlarged diameter portion 3 comes into close contact with the opening O of the pipeline P along the circumferential direction. Since the diameter-expanded portion 3 is made of an elastic material, the diameter-expanded portion 3 can be expanded until the edge portion of the opening O is buried in the diameter-expanded portion 3 to some extent, thereby providing airtightness and liquid. The airtightness is improved, and good sealing performance of the opening O by the enlarged diameter portion 3 can be ensured. When the state shown in FIG. 4B is reached, the next step is to completely seal the service team S shown in FIG.

As shown in FIG. 4B, in the seal plug device 1, the end portion of the main body portion 2 on the approach direction side, that is, the end portion on the actuating portion 5 side protrudes inward of the pipeline P, and the diameter is expanded. The diameter of No. 3 is expanded in the range from the inside of the pipeline P to the inside of the service team S. In other words, as the range in which the diameter-expanded portion 3 expands, the tapered portion 15 of the operating portion 5 protruding into the pipeline P on the approach direction side from the service team S and its peripheral portion are left in the service team S. It is a range extending to a part of the operating portion 5, the lid portion 6, the fixing portion 7, and the peripheral portion thereof. By setting the diameter-expanding range of the diameter-expanded portion 3 to a range that straddles the opening O of the pipeline P to be sealed, the opening O is not sealed only on the inner surface of the service team S. Since the seal is applied so as to cover from the approach direction side to the anti-entry direction side, good sealing performance can be obtained.

In the seal plug device 1, the diameter-expanded portion 3 is formed to be larger from the anti-entry direction side to the approach direction side, so that the diameter-expanded portion 3 comes into contact with the opening O of the pipeline P to further expand the diameter. If this is the case, the entire seal plug device 1 tends to move toward the approaching direction due to the taper formed in the enlarged diameter portion 3. However, since the seal plug device 1 is locked to the service team S by the locking portion 4, the seal plug device 1 is immovable from the position where the diameter expansion operation is performed. As a result, the edge portion of the opening O of the pipeline P bites into the enlarged diameter portion 3 to a large extent, and the seal plug device 1 can be reliably sealed.

Further, a fixed state is generated in which the position is firmly held with respect to the pipeline P and the service team S, that is, the seal plug device 1 is unlikely to be displaced from the sealing position or does not occur. Therefore, it is preferable because an accident such as inadvertent detachment from the pipeline P and the service team S of the seal plug device 1 is unlikely to occur.

In the seal plug device 1 according to the present embodiment, only the easily deformable elastic member, the diameter-expanded portion 3, has a diameter larger than the diameter of the opening O of the pipeline P. The operating portion 5 only moves along the axis of the main body portion 2, and there is no need to incorporate a diameter expanding mechanism into the operating portion 5 itself. As a result, the structure for the operating portion 5 to operate normally, the diameter expansion operation process, and the like are not complicated or complicated, and the number of parts of the seal plug device 1 can be reduced, so that maintenance and inspection are easy. It becomes.

In order to seal the cutting opening C of the service team S, first, as shown in FIG. 5A, the pressure in the conduit P is reduced. This depressurization operation is performed in order to normally fuse the sealing lid 16 to the cutting opening C, which is the next step. Specifically, as described above with reference to FIG. 2, the seal plug device 1 has a relief valve 9 and a check valve 10 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 9 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 10 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 10 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 10 with the valve opening tool A, the pressure is reduced when the pressure inside the pipeline P is higher than that of the seal plug device 1 in the anti-entry direction side, and the pressure becomes the same as that in the anti-entry direction side. can do. There are various factors that cause the pressure inside the pipeline P to become high, and for example, there is a possibility that it is caused by the residual pressure in the air purging step shown in FIG. 5 (a). This forced valve opening step is particularly effective when the pressure in the pipeline P is higher than the normal pressure, but the pressure is not high enough to open the relief valve 9.

Next, as shown in FIG. 5B, the same resin sealing lid 16 is attached to the cutting opening C of the resin service team S. The sealing lid 16 is fixedly attached to the cutting opening C by fusion. That is, in the present embodiment, the sealing lid 16 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 16. In this embodiment, in order to improve the airtightness, a sealing lid 16 having a convex portion inserted into the service team S from the cutting opening C is adopted.

When the sealing lid 16 is fused to the cutting opening C, the region between the sealing lid 16 and the sealing plug device 1 (hereinafter, referred to as “first region S1”) in the service team S is fused. Due to the heating expansion and the insertion of the convex portion at the time of the above, the pressure becomes relatively higher than the region in the conduit P (hereinafter, referred to as “second region S2”). During the mounting process of the sealing lid 16, the check valve 10 opens 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 10 has undergone the valve opening step shown in FIG. 5 (a), when the check valve 10 is opened by attaching the sealing lid 16 shown in FIG. 5 (b), a second valve is opened. 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 10, 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 16, 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 10 is opened at the time of fusion is unlikely to occur.
When the gas flows back, the sealing lid 16 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 16 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 16. 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 16.

Subsequently, in the step shown in FIG. 5C, a gas leak inspection is performed to confirm the airtightness of the sealing lid 16. When the check valve 10 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, the gas in the pipeline P is gas. The second region S2 is forcibly made higher than the first region S1 by press-fitting. When the relief valve 9 of the seal plug device 1 exceeds the operating pressure due to the press-fitting of the gas, the valve is opened, so that the gas flows from the second region S2 to the first region S1. The airtightness of the sealing lid 16 can be confirmed by monitoring the presence or absence of gas leakage from the sealing lid 16. If the sealing lid 16 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.

In the above-described embodiment, the lid portion 6 and the fixing portion 7 are provided as separate members and are fixed to each other by appropriate fixing means. However, in the present invention, if there is no problem in assembling the members, one It may be formed as one member.

An embodiment in which the seal plug device 1 is used in the original rearranging work for reducing the protrusions of the service team S attached to the pipeline P is shown. Even when it is not necessary to reduce the protrusions, the seal stopper device 1 according to the above embodiment may be used to seal the opening at the end of the service team S.

As described above, in addition to the embodiments shown in FIGS. 1 to 5, various embodiments can be adopted as long as the object of the present invention can be achieved. Hereinafter, a modified example of the locking portion in the present invention will be described with reference to FIG.
Note that FIG. 6 is a schematic cross-sectional view showing the seal stopper device 100 according to another embodiment of the present invention, and FIG. 6A is a schematic cross-sectional view showing the seal stopper device 100 according to another embodiment before operation. FIG. 6B is a schematic cross-sectional view showing the seal stopper device 100 according to another embodiment after operation.

The difference between the seal stopper device 100 shown in FIG. 6 and the seal stopper device 1 is that the locking portion 41 is used instead of the locking portion 4. Unlike the locking portion 4 having a thread formed on its peripheral surface, the locking portion 41 extends in the anti-entry direction and can be hooked on the cutting opening C of the service team S. .. Since the seal stopper device 100 uses the same members as the seal stopper device 1 except for the differences, the same members and reference numerals will be added, and detailed description thereof will be omitted. The seal plug device 100 can be used as a temporary plug having two valve bodies like the seal plug device 1.

Specifically, the locking portion 41 has a hook portion 17. The hook portion 17 is a hook-shaped portion made of the same resin material as the service chee S, extending from the peripheral edge portion of the lid portion 61 toward the anti-entry direction side, and having the tip portion bent in a substantially U shape. In the embodiment shown in FIG. 6, four hook portions 17 are provided at 90 ° intervals along the circumferential direction of the lid portion 61.

To use the seal stopper device 100, first, the seal stopper device 100 is inserted into the service team S as shown in FIG. 6A. The hook portion 17 is in a state in which the bent tip portion exposed to the outside from the cutting opening C of the service team S is caught in the edge portion of the cutting opening C, so that the seal plug device 100 is locked to the service team S. It becomes.

When the protruding distance of the service team S from the pipeline P is determined in the original rearranging work, the extending length of the hook portion 17 may be constant.
When the protrusion distance differs for each work, for example, the hook portion 17 is first provided as a strip-shaped flat plate, and the seal plug device 100 is inserted into the service team S until the enlarged diameter portion 3 faces the opening O of the pipeline P. In this state, the tip of the flat plate can be bent like a hook according to the position of the cutting opening C, and the locked state can be realized substantially at the same time. Further, the lid portion 61 and the hook portion 17 are detachably configured, and a plurality of hook portions 17 having various extending lengths are prepared in advance, and as soon as the protruding distance is determined, the length according to the protruding distance is determined. The seal stopper device 100 can be inserted into the service team S after the hook portion 17 of the above is attached to the lid portion 61.

Further, in the sealing state of the service team S by the seal stopper device 100 and the sealing lid 160, as shown in FIG. 6B, the diameter-expanded portion 3 is expanded to be in the sealing state, and then the sealing lid 160 is placed in the service team. It is realized by fusing to the cutting opening C of S. The sealing lid 160, the hook portion 17, and the service team S are fused to each other at least along the circumferential direction, so that they are integrally fixed and gas leakage can be suitably suppressed.

In the seal stopper device 100, since the locking portion 41 is locked by being caught by the edge portion of the cutting opening C of the hook portion 17, for example, only the service team S having a screw formed on the inner surface shown in FIG. However, as shown in FIG. 6, it can be applied to a service team S in which a screw is not formed and the inner surface is smooth.
Further, depending on the locking form of the locking portion 41, even if the outer diameter of the main body portion 2 is smaller than the inner diameter of the service team S and the peripheral surface portion of the main body portion 2 does not contact the inner surface of the service team S, the locking portion 2 is locked. There is no effect on the realization of. Therefore, by adopting the hook portion 17, it is not necessary to design the main body portion 2 according to the size of the service team S, and the degree of freedom in device design is improved.

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 plug devices 1 and 100 are used as temporary plugs in the original arrangement work of the service team, but in the present invention, they can be used for various pipes as long as the object of the present invention is achieved. It can be used for such work. In addition to the main arrangement work of the pipeline, for example, the pipeline P is the main branch pipe for circulating gas, and the service team S distributes the gas to each household or the like through, for example, the service team or an appropriate joint. In the case of a branch pipe, if there is a request to stop the gas flow in one of the plurality of branch pipes and maintain the state, the branch pipes are rearranged by using the seal plug devices 1 and 100 and the like. Can work.

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 and 100: Seal plug device, 2: Main body part, 3: Enlarged part, 4 and 41: Locking part, 5: Acting part, 6 and 61: Lid part, 7: Fixed part, 8: Operating part, 9 : Relief valve, 10: Check valve, 11: Holding part, 12: Operation recess, 13: External thread part, 14: Internal thread part, 15: Tapered part, 16 and 160: Sealing lid, 17: Hook part, J : Operation jig, S: Service team, P: Pipe line, O: Opening, C: Cutting opening, A: Valve opening tool, S1: 1st area, S2: 2nd area

Claims (4)

A seal plug device that seals the opening of a pipeline having a first pipeline and a second pipeline branching from the first pipeline.
A main body whose axis is arranged substantially parallel to the axis of the second pipeline when mounted in the approach direction from the second pipeline to the first pipeline.
A diameter-expanded portion having an elastic body capable of expanding the diameter, which is provided on the peripheral side surface of the main body portion on the approach direction side from the second pipeline to the first pipeline.
A locking portion provided in the main body portion on the opposite side opposite to the approaching direction side and capable of locking with respect to the pipeline, and a locking portion.
An operating portion provided on the approaching direction side of the main body portion and
A tapered portion provided at one end of the operating portion on the approach direction side and formed of an inclined surface toward the counter-entry direction side, and a tapered portion.
With
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 enlarged diameter portion
When the operating portion moves to the counter-entry direction side, it is pressed by the tapered portion and the diameter is enlarged larger than the inner diameter of the second pipeline in the range from the inside of the first pipeline to the inside of the second pipeline. As a result, it adheres along the circumferential direction of the opening.
Seal stopper device. The locking portion can be screwed into a threaded portion formed on the inner surface of the pipeline.
The seal stopper device according to claim 1. The main body has at least two valve bodies that open in only one direction when a specific pressure is applied.
One of the valve bodies and the other valve body are provided in opposite directions so that the valve opening direction is directed to the approach direction side or the anti-entry direction side.
The seal stopper device according to claim 1 or 2. A pipeline sealing method for sealing the opening of a pipeline having a first pipeline and a second pipeline branching from the first pipeline using a seal plug device.
The seal stopper device is
A main body whose axis is arranged substantially parallel to the axis of the second pipeline when mounted in the approach direction from the second pipeline to the first pipeline.
A diameter-expanded portion having an elastic body capable of expanding the diameter, which is provided on the peripheral side surface of the main body portion on the approach direction side from the second pipeline to the first pipeline.
A locking portion provided in the main body portion on the opposite side opposite to the approaching direction side and capable of locking with respect to the pipeline, and a locking portion.
An actuating portion provided on the approaching direction side of the main body portion and
A tapered portion provided at one end of the operating portion on the approach direction side and formed of an inclined surface toward the counter-entry direction side, and a tapered portion.
With
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 enlarged diameter portion
When the operating portion moves to the counter-entry direction side, it is pressed by the tapered portion and the diameter is enlarged larger than the inner diameter of the second pipeline in the range from the inside of the first pipeline to the inside of the second pipeline. As a result, it adheres along the circumferential direction of the opening.
Pipeline sealing method.

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