JP2019199918A - Pipe line branching system, and pipe lien branching method - Google Patents

Abstract

To provide a pile line branching system and a pipe line branching method, which easily suppress leakage of fluid.SOLUTION: A pipe line branching system includes a joint 2 for connecting a branch pipe line T2 to a main pipe line T1 in which fluid flows, and a shutoff device 3 mounted to the joint 2. The shutoff device 3 has: a valve seat 10 that is installed to the joint 2 and is formed with a communication passage 12 communicating with the inside of the joint 2; a shutter 11 that is formed into a plate shape, is slidably disposed on the valve seat 10 to open and close the communication passage 12, and has an inner surface 13a opposed to the joint 2 and an outer surface 13b formed at an opposite side to the inner surface 13a; and a seal member 15 disposed between the outer surface 13b of the shutter 11 and the valve seat 10. The valve seat 10 movably supports the shutter 11 such that the shutter 11 is pressed against the seal member 15 according to a pressure of the fluid that flows into the joint 2 from a through hole H formed in the main pile line T1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pipe branching system and a pipe branching method, and more particularly to a pipe branching system and a pipe branching method for branching a pipe in a state where a fluid such as a gas is flowing.

2. Description of the Related Art In recent years, a technique has been put into practical use in which a branch pipe is attached to a main pipe through which a fluid such as city gas flows while the fluid is circulated.
For example, Patent Document 1 proposes a branch extraction method using a no blow bag. In this branch extraction method, first, after a drilling device such as a punching device is attached to a predetermined position of the pipe for drilling, the removal jig is removed with the no blow bag attached, and the opening is temporarily inserted into the drilled opening. Install the stop plug. Subsequently, the service cheese is attached to the opening instead of the temporary fixing plug, the no blow bag is removed, and the new pipe is extended from the service cheese take-out portion. And in the state which attached the no blow bag, the stopper for service cheese is removed and a plug is attached to the pipe end of service cheese. In this way, by performing the work with the no-blow bag attached, the pipe can be branched relatively safely without stopping the flow of fluid in the pipe.

JP 2001-082672 A

  However, the branch extraction method of Patent Document 1 needs to repeat the attachment and detachment of the no-blow bag many times in order to prevent fluid leakage, and it is difficult to easily suppress fluid leakage.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a pipeline branching system and a pipeline branching method that easily suppress fluid leakage.

  A pipe branching system according to the present invention includes a joint that connects a branch pipe to a main pipe through which a fluid flows, and a switchgear attached to the joint. The switchgear is attached to the joint and communicates with the joint. A valve seat formed with a communication passage, and a plate-shaped and slidably disposed on the valve seat so as to open and close the communication passage, and an outer surface formed opposite to the inner surface And a seal member disposed between the outer surface of the shutter and the valve seat, the valve seat depending on the pressure of the fluid flowing into the joint from the through hole formed in the main conduit The shutter is movably supported so that the shutter is pressed against the seal member.

  Here, the seal member is a first seal member, and the opening / closing device is disposed between the inner surface of the shutter and the valve seat, and is a second seal member having a smaller cross-sectional area than the first seal member. It is preferable to have.

  Further, the valve seat is formed so that a piercing device for forming a through hole can be attached to the main pipe line, and the shutter can be arranged to open and close a communication path extending between the piercing device and the joint.

  Further, the valve seat has a space for sliding the shutter, and the surface of the space abuts on the inner surface of the shutter and the shutter is formed so as to be movable away from the outer surface of the shutter according to the fluid pressure. Is preferred.

Further, the valve seat is formed with a constant width throughout the entire space, and can support the shutter so that it can move in parallel.
Further, the valve seat is formed so that the width on the back side is larger than the entrance / exit side of the shutter in the space, and the valve seat can also be supported so as to be tilted.

  Further, the shutter has a moving portion in which a portion corresponding to the communication path is movably disposed on the seal member side, and a shutter main body that supports the moving portion, and the valve seat has a space surface on the outer surface of the shutter main body. The moving part can be formed to be movable away from the outer surface of the moving part.

  Further, the switchgear includes a clamp portion that is arranged so as to surround the outer surface of the part to which the joint is attached, and clamps and fixes the switchgear and the joint from the outside, and a fitting part that protrudes from the outer surface of the part to which the joint is attached. The fitting portion has a fitting side inclined surface that is inclined toward the joint toward the protruding direction, and the clamp portion has a clamp side inclined surface that is inclined along the fitting side inclined surface. According to the tightening, the fitting portion can be fitted so as to increase the contact portion between the clamp side inclined surface and the fitting side inclined surface.

  In the pipe branching method according to the present invention, a branch pipe is connected to a main pipe through which a fluid flows through a joint, an opening / closing device is attached to the joint, and a communication path formed in a valve seat of the switching device is provided in the joint. The shutter is formed in a plate shape and is slidably disposed on the valve seat so as to open and close the communication path, and has an inner surface facing the joint and an outer surface formed on the opposite side of the inner surface. The shutter, which is closed and supported by the valve seat so as to be movable toward the seal member disposed between the outer surface of the shutter and the valve seat, has the pressure of the fluid flowing into the joint from the through hole formed in the main pipeline. Accordingly, the fluid is pressed against the seal member and the fluid flows through the branch pipe.

  Here, after the switchgear is attached to the joint and the communication passage communicates with the joint, the punching device is attached to the valve seat, the shutter is opened, the drilling device is connected to the joint through the communication passage, and the main pipe is connected with the punching device. It is preferable to form a through hole.

  According to the present invention, the valve seat movably supports the shutter so that the shutter is pressed against the seal member in accordance with the pressure of the fluid flowing into the joint from the through hole formed in the main pipe line. It is possible to provide a pipeline branching system and a pipeline branching method that easily suppress the above.

It is a figure which shows the structure of the pipeline branching system which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structure of an opening / closing apparatus. It is sectional drawing which shows a mode that a valve seat supports a shutter so that a movement is possible. It is a figure which shows a mode that a branch pipeline and an opening / closing device are attached to a main pipeline. It is a figure which shows a mode that a through-hole is formed in a main pipeline. It is a figure which shows a mode that a plug is fitted by the opening part of a coupling. It is sectional drawing which shows the structure of the switchgear of Embodiment 2. FIG. 6 is a cross-sectional view illustrating a configuration of a valve seat according to a third embodiment. FIG. 6 is a cross-sectional view illustrating a configuration of a valve seat according to a fourth embodiment. FIG. 10 is a cross-sectional view illustrating a configuration of a shutter and a valve seat according to a fifth embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1
FIG. 1 shows the configuration of a pipeline branching system according to Embodiment 1 of the present invention. This pipeline branching system includes a fixed portion 1 fixed to a main pipeline T1 through which a fluid flows, a joint 2 connected to the fixed portion 1, and an opening / closing device 3 attached to the joint 2.

  The fixing portion 1 is a so-called split sleeve, has a pipe shape surrounding the main pipeline T1, and is formed so as to be divided in a direction perpendicular to the main pipeline T1 at the center thereof. A stopper 4 is disposed at the divided portion, and the fixing portion 1 is stopped so as not to be detached from the main pipeline T1. The fixed portion 1 is provided with a protruding portion 5 for connecting the joint 2. The projecting portion 5 is formed with an opening communicating with the through hole H formed in the main pipe line T1.

  The joint 2 is a so-called service team and has three connection portions 6a, 6b, and 6c. The connecting portion 6a is formed so as to protrude toward the fixed portion 1, and the connecting portion 6b is formed so as to protrude toward the opposite side of the connecting portion 6a. Moreover, the connection part 6c is formed so that it may protrude to the side from between the connection part 6a and the connection part 6b. And while the connection part 6a is connected to the protrusion part 5 of the fixing | fixed part 1, the connection part 6b is connected to the switchgear 3, and the connection part 6c is connected to the branch line T2. Openings 7a, 7b, and 7c are formed in the connecting portions 6a, 6b, and 6c, respectively, and the main pipe line T1, the opening / closing device 3, and the branch pipe line T2 are communicated with each other through the openings 7a to 7c. .

  The opening / closing device 3 includes a clamp portion 8, attachment portions 9 a and 9 b, a valve seat 10, and a shutter 11. As shown in FIG. 2, the attachment portion 9a, the valve seat 10 and the attachment portion 9b are arranged so as to overlap each other, and a communication passage 12 penetrating the attachment portion 9a, the valve seat 10 and the attachment portion 9b is formed therein. Has been.

The attachment portion 9a is for attaching the valve seat 10 to the joint 2, and the connection portion 6b of the joint 2 is fitted into the attachment portion 9a. As a result, the communication passage 12 formed in the attachment portion 9a is communicated with the joint 2 through the opening 7b.
The attachment portion 9b is for attaching an external device to the valve seat 10, and is formed so that an external device such as a drilling device for forming the through hole H in the main pipe line T1 can be attached.

The valve seat 10 is arrange | positioned between the attaching part 9a and the attaching part 9b, and has the inner side valve seat 10a fixed to the attaching part 9a, and the outer side valve seat 10b fixed to the attaching part 9b. The valve seat 10 is attached to the connection portion 6b of the joint 2 via the attachment portion 9a, whereby the communication passage 12 formed in the valve seat 10 is communicated with the joint 2.
The shutter 11 is formed in a plate shape, and is slidably disposed between the inner valve seat 10a and the outer valve seat 10b so as to open and close the communication passage 12 formed in the valve seat 10. Moreover, the shutter 11 has the inner surface 13a which opposes the coupling 2 on both sides of the attaching part 9a, and the outer surface 13b formed in the other side of the inner surface 13a.
The clamp part 8 is arrange | positioned so that the outer periphery of the connection part 6b and the attachment part 9a of the coupling 2 may be enclosed, and it clamps and fixes the connection part 6b and the attachment part 9a from the outer side.

Next, the configuration of the valve seat 10 and the shutter 11 will be described in detail.
As shown in FIG. 3 (a), a space 14 for sliding the shutter 11 is formed in the valve seat 10, and a central side seal member 15 and a pair of inlet / outlet side seal members are exposed to the space 14. 16a and 16b are arranged.

The central seal member 15 is disposed between the outer surface 13b of the shutter 11 and the lower surface of the outer valve seat 10b in the vicinity of the communication path 12. The center side sealing member 15 has a circular cross section and is formed in an annular shape so as to surround the communication path 12.
The entrance / exit side seal members 16a and 16b are disposed in the vicinity of the entrance / exit 11a where the shutter 11 is taken in / out, and are formed to extend along the entrance / exit 11a. The inlet / outlet side seal member 16a is disposed between the inner surface 13a of the shutter 11 and the upper surface of the inner valve seat 10a, and the inlet / outlet side seal member 16b is disposed between the outer surface 13b of the shutter 11 and the lower surface of the outer valve seat 10b. Has been. The entrance-and-exit side seal members 16a and 16b can be comprised, for example from a round packing.

  The space 14 of the valve seat 10 is formed larger than the thickness of the shutter 11. Specifically, the space 14 is formed with such a width that a gap is created between the shutter 11 and the lower surface of the outer valve seat 10b, that is, the surface of the space 14 abuts the inner surface 13a of the shutter 11 and the shutter 11 moves. It is formed so as to be separated from the outer surface 13b of the shutter 11 (see FIG. 3A). Thereby, the valve seat 10 can move the shutter 11 so that the shutter 11 is pressed against the center-side seal member 15 according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipe line T1. Can be supported. That is, as shown in FIG. 3B, the valve seat 10 supports the shutter 11 so as to move toward the center-side seal member 15 according to the pressure of the gas G from the inner surface 13 a side of the shutter 11. Here, the valve seat 10 has a space 14 formed with a constant width throughout, and supports the shutter 11 so as to be movable in parallel.

Next, the pipe branching method of this embodiment will be described.
First, as shown in FIG. 4 (a), the fixing portion 1 is fixed to the main pipeline T1 through which the gas G flows, and the connecting portion 6a of the joint 2 is connected to the protruding portion 5 and the connecting portion 6c of the joint 2 is connected. Connect the branch line T2. Thereby, the branch pipeline T2 is connected to the main pipeline T1 via the joint 2.
Here, an airtight test is performed on all the spaces of the joint 2 and the branch pipe T2, for example, between the connection portion 6c of the joint 2 and the branch pipe T2, and between the connection portion 6a of the joint 2 and the protruding portion of the fixing portion 1. It is confirmed that the fluid does not leak from between 5 and the like.

When the airtightness of the joint 2 and the branch pipe T2 is confirmed, the opening / closing device 3 is attached to the connection portion 6b of the joint 2 as shown in FIG. At this time, as shown in FIG. 2, the opening / closing device 3 is attached such that the communication passage 12 formed in the attachment portion 9a, the valve seat 10 and the attachment portion 9b communicates with the joint 2 through the opening 7b. .
Thereafter, as shown in FIG. 5A, the punching device P is attached to the attachment portion 9 b of the opening / closing device 3. When the punching device P is attached, as shown in FIG. 5B, the shutter 11 of the opening / closing device 3 is slid to open the communication passage 12, and the punching device P is connected to the joint 2 through the communication passage 12. . The hole saw part Pa is caused to enter the joint 2 from the punching device P through the open communication path 12, and then the hole saw part Pa is caused to enter the fixed part 1 through the opening 7 a of the joint 2. When the hole saw part Pa that has entered the fixed part 1 comes into contact with the main pipe line T1, it forms a through hole H in the main pipe line T1 as it is.

  In this way, when the through hole H is formed in the main pipeline T1, the hole saw portion Pa is returned to the punching device P and removed from the fixing portion 1, the joint 2, and the opening and closing device 3. Here, the gas G flowing through the main pipe line T1 not only flows from the through hole H formed in the main pipe line T1 into the branch pipe line T2 via the fixing portion 1 and the joint 2, but also the communication path of the switchgear 3. 12 also flows.

Therefore, as shown in FIG. 3A, the shutter 11 is slid to close the communication passage 12 formed in the valve seat 10, thereby preventing the gas G from leaking from the communication passage 12 to the outside. . As described above, since the shutter 11 is slidably disposed on the valve seat 10, the leakage of the gas G can be easily suppressed only by sliding the shutter 11.
Further, as shown in FIG. 3B, the shutter 11 is supported by the valve seat 10 so as to move in accordance with the pressure of the gas G flowing into the joint 2 from the through hole H of the main pipe line T1. For this reason, the shutter 11 is pressed against the center-side seal member 15 according to the pressure of the gas G, and the gas G can be reliably suppressed from flowing out from the gap between the shutter 11 and the valve seat 10.

  Thus, when the shutter 11 is slid and the communication passage 12 of the valve seat 10 is closed, the punching device P is removed from the attachment portion 9b of the opening / closing device 3, and as shown in FIG. A no blow bag N is attached. Subsequently, the shutter 11 is opened again, and the plug L is fitted into the opening 7 b of the joint 2 through the communication path 12 of the opening / closing device 3. When the opening 7 b of the joint 2 is closed by the plug L, the no-blow bag N and the opening / closing device 3 are removed from the joint 2. Thereby, the gas G which distribute | circulates the main pipe line T1 flows in into only the branch pipe line T2, and the main pipe line T1 can be branched by the branch pipe line T2.

According to the present embodiment, the shutter 11 is slidably disposed so as to open and close the communication passage 12 formed in the valve seat 10, so that the gas G can be easily leaked from the communication passage 12 to the outside. Can be suppressed.
Further, since the shutter 11 is movably supported so as to be pressed against the central seal member 15 in accordance with the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipe line T1, the communication path The leakage of the gas G from 12 to the outside can be reliably suppressed.

Embodiment 2
In said Embodiment 1, it is preferable that the clamp part 8 fixes the connection part 6b and the attachment part 9a of the coupling 2 firmly.
For example, as shown in FIG. 7A, the clamp portion 21 can be arranged instead of the clamp portion 8 of the first embodiment, and the attachment portion 22 can be arranged instead of the attachment portion 9a.

  The attachment part 22 has a fitting part 23 in which an outer surface of a part to which the connection part 6b of the joint 2 is attached protrudes sideways. The fitting portion 23 is formed such that the fitting-side inclined surface 23a facing the valve seat 10 side is inclined toward the joint 2 side in the protruding direction. Further, the mounting portion 22 is provided with a packing 22 a that abuts the connection portion 6 b on the lower surface of the joint 2 that faces the connection portion 6 b. The packing 22a is formed in an annular shape corresponding to the edge of the connecting portion 6b.

The clamp part 21 includes a main body part 24, a lock guide 25, and an elastic body 26.
The main body portion 24 is disposed so as to surround the outer surface of the connection portion 6b and the attachment portion 22 of the joint 2, and the connection portion 6b and the attachment portion 22 are fastened and fixed from the outside. A plurality of protrusions 27 are formed on the main body 24 at the end facing the connection portion 6 b of the joint 2.

The lock guide 25 is disposed inside the main body portion 24 so as to face the fitting portion 23 of the attachment portion 22, and is formed in an annular shape along the fitting portion 23. The lock guide 25 has a clamp-side inclined surface 25 a that contacts the fitting-side inclined surface 23 a of the fitting portion 23, and the clamp-side inclined surface 25 a is inclined along the fitting-side inclined surface 23 a of the fitting portion 23. It is formed to do.
The elastic body 26 is disposed inside the main body 24 so as to sandwich the lock guide 25 with the fitting portion 23. The elastic body 26 is formed in an annular shape along the lock guide 25.

With such a configuration, when the connection portion 6b and the attachment portion 22 are tightened by the main body portion 24 of the clamp portion 21, as shown in FIG. 7B, the lock guide 25 and the fitting portion 23 are clamped inclined surface 25a. Are moved and fitted so as to increase the contact portion of the fitting-side inclined surface 23a. Thereby, the joint 2 and the attachment part 22 can be firmly fixed.
Further, according to the fitting of the lock guide 25 and the fitting portion 23, the main body portion 24 is deformed so as to be reduced in diameter. Accordingly, the attachment portion 22 is moved so as to press the packing 22a against the connection portion 6b of the joint 2, and the plurality of protrusions 27 are pressed against the connection portion 6b. As described above, the connection portion 6b is pressed against the packing 22a, whereby the gas G can be prevented from leaking to the outside from between the connection portion 6b and the attachment portion 22. Moreover, the joint 2 and the attachment part 22 can be firmly connected by pressing the plurality of protrusions 27 against the connection part 6b.

  Here, when the through hole H is formed in the main pipe line T1 and the shutter 11 moves so as to be pressed against the center-side seal member 15 of the valve seat 10 according to the pressure of the gas G, the mounting portion 22 becomes the lock guide 25. Slightly moves toward the valve seat 10 along the inclined surface 25a. Thereby, it can suppress that the shutter 11 is rapidly pressed against the center side sealing member 15 according to the pressure of the gas G, and the shutter 11 can be pressed against the center side sealing member 15 in an appropriate posture.

  According to the present embodiment, the clamp portion 21 moves so that the lock guide 25 and the fitting portion 23 increase the close contact portions of the clamp-side inclined surface 25a and the fitting-side inclined surface 23a as the body portion 24 is tightened. In order to fit, the joint 2 and the attachment part 22 can be firmly fixed.

Embodiment 3
In the first and second embodiments, the center-side seal member 15 is disposed only between the outer surface 13b of the shutter 11 and the lower surface of the outer valve seat 10b, but the inner surface 13a of the shutter 11 and the inner valve seat 10a It can also be arranged between the upper surface.
For example, as shown in FIG. 8, the center-side seal member 31 can be arranged in the first embodiment.

  The central seal member 31 is disposed at a position corresponding to the central seal member 15 between the inner surface 13a of the shutter 11 and the upper surface of the inner valve seat 10a. Here, the center side sealing member 31 is formed to have a smaller cross-sectional area than the center side sealing member 15.

  With such a configuration, the shutter 11 moves so as to be pressed against the center-side seal member 15 in accordance with the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. At this time, since the central seal member 31 is disposed on the inner surface 13a side of the shutter 11, the leakage of the gas G from the communication path 12 to the outside can be more reliably suppressed. Further, since the leakage of the gas G is suppressed by pressing the shutter 11 against the central seal member 15, the leakage of the gas G increases from a predetermined value even if the cross sectional area of the central seal member 31 is made small. The configuration of the valve seat 10 can be simplified by reducing the cross-sectional area of the center-side seal member 31.

  According to the present embodiment, since the center side seal member 31 having a smaller cross-sectional area than the center side seal member 15 is disposed between the inner surface 13a of the shutter 11 and the valve seat 10, the communication path 12 is connected to the outside. The leakage of the gas G can be more reliably suppressed with a simple configuration.

Embodiment 4
In the first to third embodiments, the space 14 of the valve seat 10 is formed with a constant width. However, it is sufficient that the shutter 11 can be moved so as to be pressed against the center-side seal member 15, and is limited to a certain width. It is not a thing.
For example, as shown in FIG. 9, a space 41 can be formed instead of the space 14 of the valve seat 10 of the first embodiment. The space 41 is formed so that the width on the back side is larger than the entrance / exit 11a side where the shutter 11 is taken in and out, and the shutter 11 can be supported so as to be inclined.

  With such a configuration, the shutter 11 moves so as to be pressed against the center-side seal member 15 in accordance with the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. At this time, the shutter 11 is pressed against the center-side seal member 15 in such a posture that the back side largely moves with respect to the entrance / exit 11a side and is inclined obliquely.

  According to the present embodiment, the shutter 11 is attached to the center-side seal member 15 in such a posture that the shutter 11 is inclined obliquely according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. Since it is supported to be movable so as to be pressed, the leakage of the gas G from the communication path 12 to the outside can be reliably suppressed.

Embodiment 5
In the above-described first to fourth embodiments, the shutter 11 is formed so as to move as a whole according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipe line T1. What is necessary is just to be able to move so that it may be pressed against the side seal member 15, and it is not restricted to what moves as a whole.
For example, as shown in FIG. 10, the shutter 51 can be arranged instead of the shutter 11 of the first embodiment, and the space 52 can be formed instead of the space 14 of the valve seat 10.

The shutter 51 includes a moving portion 53a and a shutter main body 53b that supports the moving portion 53a at a portion corresponding to the communication path 12 of the valve seat 10. The moving portion 53a is urged toward the inner valve seat 10a side with respect to the shutter main body 53b so as to be movable toward the central seal member 15 side according to the pressure of the gas G. That is, the moving part 53a is urged so as to be positioned in the same plane as the shutter main body 53b when the pressure of the gas G is not generated.
The space 52 of the valve seat 10 is formed such that a portion corresponding to the moving portion 53a of the shutter 51 is wide, that is, a width such that the lower surface of the outer valve seat 10b is separated from the outer surface 13b of the moving portion 53a so that the moving portion 53a can move. The other part is formed in such a width that it is close to the outer surface 13b of the shutter main body 53b.

  With such a configuration, the moving portion 53a of the shutter 51 moves in the space 52 of the valve seat 10 according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipe line T1, and the center side It is pressed against the seal member 15. At this time, the shutter main body 53b is hardly moved because the space 52 of the valve seat 10 is formed with the same width as the thickness of the shutter main body 53b. Thereby, the leakage of the gas G from the communicating path 12 to the outside can be reliably suppressed by pressing the moving portion 53a against the central seal member 15 while maintaining the sealing performance at the entrance / exit 11a of the shutter 51.

  According to the present embodiment, the shutter 51 has a moving portion 53a corresponding to the communication passage 12 of the valve seat 10 in accordance with the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. Since only the gas moves so as to be pressed against the center-side seal member 15, the leakage of the gas G from the communication path 12 to the outside can be further reliably suppressed.

DESCRIPTION OF SYMBOLS 1 Fixing part 2 Joint 3 Opening and closing device 4 Stopper 5 Protrusion part 6a, 6b, 6c Connection part 7a, 7b, 7c Opening part 8, 21 Clamp part 9a, 9b, 22 Mounting part 10 Valve seat 10a Inner valve seat 10b Outer valve Seat 11, 51 Shutter 11a Entrance / exit 12 Communication path 13a Shutter inner surface 13b Shutter outer surface 14, 41, 52 Space 15, 31 Center side seal member 16a, 16b Entrance / exit side seal member 23 Fitting portion 23a Fitting side inclined surface 22a Packing 24 Main body part 25 Lock guide 25a Clamp side inclined surface 26 Elastic body 27 Plural projection parts 53a Moving part 53b Shutter main body T1 Main pipe line T2 Branch pipe line H Through hole G Gas P Punching device Pa Horsor part N No blow bag L Plug

Claims (10)

A joint that connects the branch pipe to the main pipe through which the fluid flows;
An opening and closing device attached to the joint,
The switchgear is
A valve seat attached to the joint and having a communication passage communicating with the joint;
A shutter that is formed in a plate shape and is slidably disposed on the valve seat so as to open and close the communication path, and has an inner surface facing the joint and an outer surface formed on the opposite side of the inner surface;
A seal member disposed between an outer surface of the shutter and the valve seat;
The valve seat movably supports the shutter so that the shutter is pressed against the seal member in accordance with the pressure of the fluid flowing into the joint from a through hole formed in the main pipeline. Pipe branching system. The seal member is a first seal member;
The switchgear is
2. The pipeline branching system according to claim 1, further comprising a second seal member disposed between an inner surface of the shutter and the valve seat and having a cross-sectional area smaller than that of the first seal member. The valve seat is formed so that a perforation device for forming the through hole can be attached to the main pipeline,
The pipeline branching system according to claim 1 or 2, wherein the shutter is arranged to open and close the communication path extending between the punching device and the joint.   The valve seat has a space for sliding the shutter, the surface of the space abuts against the inner surface of the shutter, and the shutter is movable away from the outer surface of the shutter according to the pressure of the fluid. The pipeline branching system according to any one of claims 1 to 3, which is formed as described above.   5. The pipe branching system according to claim 4, wherein the valve seat is formed with a constant width over the entire space, and supports the shutter so as to be movable in parallel.   The pipe branching system according to claim 4, wherein the valve seat is formed so that a width on a back side is larger than an entrance / exit side of the shutter in the space, and the shutter is movably supported so as to be inclined. The shutter includes a moving portion in which a portion corresponding to the communication path is movably disposed on the seal member side, and a shutter main body that supports the moving portion,
The pipe branching system according to claim 4, wherein the valve seat is formed so that a surface of the space is close to an outer surface of the shutter main body and the moving unit is movable away from the outer surface of the moving unit. The switchgear is disposed so as to surround an outer surface of a part to which the joint is attached, and a clamp part that fastens and fixes the switchgear and the joint from the outside; and a fitting part that protrudes from an outer surface of the part to which the joint is attached. Have
The fitting portion has a fitting-side inclined surface that is inclined toward the joint toward the protruding direction,
The clamp portion has a clamp-side inclined surface that is inclined along the fitting-side inclined surface, and increases a contact portion between the clamp-side inclined surface and the fitting-side inclined surface as the clamp portion is tightened. The pipe branching system according to any one of claims 1 to 7, wherein the pipe branching system is fitted to the fitting portion. A branch pipe is connected to the main pipe through which the fluid flows through a joint,
An opening / closing device is attached to the joint, and a communication path formed in a valve seat of the opening / closing device communicates with the joint,
The communication path includes a shutter formed in a plate shape and slidably disposed on the valve seat so as to open and close the communication path, and having an inner surface facing the joint and an outer surface formed on the opposite side of the inner surface. Close
The shutter supported by the valve seat so as to be movable toward a seal member disposed between the outer surface of the shutter and the valve seat flows into the joint from a through hole formed in the main conduit. A pipeline branching method, wherein the fluid flows through the branch pipeline by being pressed against the seal member according to the pressure of the fluid.   After the opening and closing device is attached to the joint and the communication passage communicates with the joint, a punching device is attached to the valve seat, the shutter is opened, and the punching device is connected to the joint through the communication passage. The pipe branching method according to claim 9, wherein the through hole is formed in the main pipe with the punching device.