JP2013174337A - Pipe closing instrument, and pipe connecting method using the pipe closing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe closing instrument capable of passing through a pipe material, even if there is a portion smaller in inner diameter than the existing pipe in the pipe material when a new pipe material is connected to the existing pipe.SOLUTION: A pipe closing instrument includes: two disc bodies 11, 12 the outer diameters of which are D; elastic bodies 22, 24 the outer diameters of which are Din a natural state; a bar-like member 7 fixed to one disc body 11; and a cylindrical member 6 fixed to the other disc body and relatively rotatable with respect to the bar-like member 7. Positive rotation of the cylindrical member 6 with respect to the bar-like member 7 makes the outer diameters of the elastic bodies 22, 24 be equal to or larger than an inner diameter Dof a pipe to be closed, and negative rotation of the cylindrical member 6 with respect to the bar-like member 7 makes the outer diameters of the elastic bodies 22, 24 be equal to or smaller than an inner diameter Dof the pipe material through which they pass, and be equal to or larger than the outer diameters Dof the disc bodies, so that the D, D, D, Dsatisfy the following relationship of D>D>D>D.

Description

The present invention includes two circular plate body having an outer diameter D _3, is interposed between the two disk body, and at least one ring-shaped elastic body having an outer diameter D ₀ in the natural state, one of the circle A rod-shaped member fixed to the plate body and penetrating through the elastic body and the other disk body; and fixed to the other disk body; and rotatable relative to the rod-shaped member on an outer peripheral surface of the rod-shaped member; A cylindrical member that is relatively movable in a direction parallel to the rod-shaped member, and the one circular disc body in a natural state posture in which the elastic body is in a natural state by positive rotation of the cylindrical member with respect to the rod-shaped member; With respect to the natural state separation distance, which is the distance between the other disk body, the separation distance between the one disk body and the other disk body is reduced, and the outer diameter of the elastic body is reduced. The present invention relates to a pipe closing device that can be set to a pipe inner diameter D ₁ or more to be closed.

  When extending or replacing an existing pipe in a pipe such as a gas pipe, a pipe joint is generally attached to the pipe end of the existing pipe by welding. In such welding work, it is common to temporarily close the existing pipe so that the gas remaining in the existing pipe does not leak from the downstream side of the pipe and ignite.

  As an instrument for temporarily closing the inside of existing piping (pipe closing instrument), as shown in Patent Document 1, a seal portion is provided at the tip of a rod-like member, and the seal portion is made of an elastic material. Is known.

JP-A-63-67497

However, the tube closing device is configured so that the outer diameter of the annular packing can be made substantially the same as the inner diameter of the existing piping (can be expanded) after being inserted into the existing piping to be closed. It was not constituted so that the diameter of the annular packing could be reduced. For this reason, when connecting a new pipe to the existing pipe, it is necessary to devise, for example, using a plurality of reducers so that a portion having a smaller inner diameter than the existing pipe does not occur in the pipe. There was a problem in material cost and workability related to connection of piping.
Furthermore, when a new pipe is connected to the pipe end of the existing pipe via a joint, it is necessary to release the blockage state by the pipe closing device from the pipe end side of the new pipe and take out the entire pipe closing device outside the pipe. No consideration was given to such removal.

  The present invention has been made in view of the above problems, and its purpose is to connect a pipe material even when a new pipe material is connected to the existing pipe, even if a portion having a smaller inner diameter than the existing pipe occurs in the pipe material. It aims at providing the tube closure instrument which can pass. Moreover, it aims at providing the pipe connection method with favorable material cost and workability at the time of connecting new piping with respect to existing piping using such a pipe | tube closure instrument.

Two disk bodies having an outer diameter D _{3 according} to the present invention, at least one ring-shaped elastic body having an outer diameter D ₀ in a natural state, interposed between the two disk bodies, and one circle A rod-shaped member fixed to the plate body and penetrating through the elastic body and the other disk body; and fixed to the other disk body; and rotatable relative to the rod-shaped member on an outer peripheral surface of the rod-shaped member; A cylindrical member that is relatively movable in a direction parallel to the rod-shaped member, and the one circular disc body in a natural state posture in which the elastic body is in a natural state by positive rotation of the cylindrical member with respect to the rod-shaped member; With respect to the natural state separation distance, which is the distance between the other disk body, the separation distance between the one disk body and the other disk body is reduced, and the outer diameter of the elastic body is reduced. characteristic feature of the tube closure device which can be a closed target piping inner diameter D ₁ or more, before Due to the reverse rotation of the cylindrical member with respect to the rod-shaped member, the separation distance between the one disk body and the other disk body is increased with respect to the natural state separation distance, and the outer diameter of the elastic body is increased. The inner diameter D ₂ or less of the tube material to be passed and the outer diameter D ₃ or more of the disc body, and the D ₀ , D ₁ , D ₂ , and D ₃ satisfy the following relationship.
D ₁ > D ₀ > D ₂ > D ₃

  Here, “the elastic body is in a natural state” means a state in which neither the tensile stress nor the compressive stress is applied to the elastic body and the elastic body has a natural length. Further, “forward rotation” means rotation to one side, and “reverse rotation” means rotation in the opposite direction to forward rotation.

  According to the said characteristic structure, the outer diameter of a pipe | tube obstruction | occlusion instrument can be made smaller than the internal diameter of the pipe material of passage object by rotating a cylindrical member reversely with respect to a rod-shaped member. Therefore, for example, when a new pipe material is connected to a pipe to be closed such as an existing pipe, a pipe closing device is provided that can pass through the pipe material even when a portion having an inner diameter smaller than that of the existing pipe occurs in the pipe material. be able to.

In a tube closure device according to the present invention, the disk body of the other side, the outer peripheral portion at the outer diameter D ₃ on the opposite side is provided with a ring-shaped cover portion formed in a tapered shape and the elastic body It is preferable.

  According to the above characteristic configuration, when the tube closing device passes through the tube material from the other disk body side, the cover portion first contacts the tube material, so that the other disk body is prevented from being damaged or worn. Can do. Moreover, since the cover part is formed in the taper shape, the tube closing device which can perform the axial center alignment with a tube material and a tube closing device smoothly can be provided because a cover part and a tube material contact.

Further, in a tube closure device according to the present invention, the an intermediate disc body having an outer diameter D ₃ between one of the disk body and the other of the disk body, wherein the intermediate circle and the one of the disk body It is preferable that the elastic body is provided between the plate body and between the other disk body and the intermediate disk body.

  According to the above characteristic configuration, when the separation distance between one disk body and the other disk body is changed, the elastic body between the one disk body and the intermediate disk body, and the other Compressive stress or tensile stress is uniformly generated in the two elastic bodies, i.e., the elastic body between the disk body and the intermediate disk body. Therefore, the piping to be closed can be closed by two elastic bodies having the same outer diameter. For this reason, it can suppress that the center axis | shaft of the said piping and the center axis | shaft of a pipe | tube closure apparatus shift | deviate, and the pipe | tube closure apparatus which can block | close a pipe appropriately can be provided.

  Further, in the tube closing device according to the present invention, the rod-like member is connected to the disc-body-side rod-like member fixed to the one disc-body and the non-disk-body side of the disc-body-side rod-like member so as to be integrally rotatable. The cylindrical member can be integrally rotated to the disc body side cylindrical member fixed to the other disc body and the non-disc body side of the disc body side cylindrical member. It is preferable that it consists of the cylindrical member for an extension connected to.

  According to the above characteristic configuration, when the tube closing device is not used, the space required for storage and carrying can be reduced by removing the extending rod-shaped member and the extending cylindrical member. In addition, it is possible to cope with the case where the length of the pipe material newly connected to the pipe to be blocked is different (long) by simply preparing the extending rod member and the extending cylindrical member having different lengths. Can do. That is, it is possible to provide a tube closing device excellent in portability and versatility.

  In the tube closing device according to the present invention, it is preferable that each of the extending rod-shaped member and the extending cylindrical member is provided with a handle portion for rotating operation.

  According to the above characteristic configuration, the operator using the tube closing device can easily rotate the rod-shaped member relative to the cylindrical member by operating the handle portion for rotation operation.

Using the pipe closing device according to the present invention, the first pipe to be closed having an inner diameter D ₁ is connected to the first pipe having the inner diameter D ₂ through the joint that is the pipe material and has a larger inner diameter than D _2. A characteristic configuration of the pipe connection method for connecting the second pipe is that the elastic body is maintained in the natural state, the disk body side rod-shaped member, the disk body side cylindrical member, and the one and the other disk bodies. An insertion step of inserting the first elastic member into the first pipe, and bringing the one and the other disc bodies inserted into the first pipe in the insertion step closer to each other to reduce the outer diameter of the elastic body. After the first pipe closing step for closing the first pipe and the first pipe closing step, which are the same as the inner diameter D1 of _one pipe, the second pipe is connected to the first pipe via the joint. After connecting the pipe connecting step and the pipe connecting step, the one and the other The outer diameter of the elastic body by separating the plate body running diameter step of the inner diameter D ₂ less the tubing, the tubing closure device in a reduced diameter state in which the first pipe, the fitting, the second pipe It is to perform the taking-out process to take out from.

  According to the said characteristic structure, when connecting 2nd piping to 1st piping which is the obstruction | occlusion object of a tube closing instrument, the coupling provided with the location where an internal diameter is smaller than 1st piping can be used. That is, when connecting the second pipe to the first pipe, there is no need to devise the use of a plurality of pipe materials, and a pipe connection method with good material cost and workability can be provided. As an example of such a joint, there can be mentioned a steel pipe TR joint provided with a so-called stiffener used for connecting a PE pipe to a steel pipe.

Using the pipe closing device according to the present invention, the first pipe to be closed having an inner diameter D ₁ is connected to the first pipe having the inner diameter D ₂ through the joint that is the pipe material and has a larger inner diameter than D _2. A characteristic configuration of the pipe connection method for connecting the second pipe is that the elastic body is maintained in the natural state, the disk body side rod-shaped member, the disk body side cylindrical member, and the one and the other disk bodies. An insertion step of inserting the first elastic member into the first pipe, and bringing the one and the other disc bodies inserted into the first pipe in the insertion step closer to each other to reduce the outer diameter of the elastic body. After the first pipe closing step for closing the first pipe and the first pipe closing step, which are the same as the inner diameter D1 of _one pipe, the second pipe is connected to the first pipe via the joint. After connecting the pipe connecting step and the pipe connecting step, the disc body side rod-like portion The extension rod-shaped member is integrally connected to the disk body-side cylindrical member, an extension step of integrally connecting the extension cylindrical member to the disc body-side cylindrical member, and the extension rod-shaped member and the extension after the extension step is executed. using the use cylindrical member running diameter step of the inner diameter D ₂ less the tubing the outer diameter of the elastic body is separated the one and the other disc body, a tube in the reduced diameter state It is in performing the taking-out process which takes out an obstruction | occlusion instrument from the said 1st piping, the said joint, and the said 2nd piping.

  According to the said characteristic structure, when connecting 2nd piping to 1st piping which is the obstruction | occlusion object of a tube closing instrument, the coupling provided with the location where an internal diameter is smaller than 1st piping can be used. That is, when connecting the second pipe to the first pipe, there is no need to devise the use of a plurality of pipe materials, and a pipe connection method with good material cost and workability can be provided. As an example of such a joint, there can be mentioned a steel pipe TR joint provided with a so-called stiffener used for connecting a PE pipe to a steel pipe. In addition, it is possible to cope with the case where the length of the pipe material newly connected to the pipe to be blocked is different (long) by simply preparing the extending rod member and the extending cylindrical member having different lengths. Can do. That is, a pipe connection method having excellent versatility can be provided.

1 is a schematic view of a tube closure device according to an embodiment of the present invention. It is sectional drawing of the main-body part of the tube closure instrument which concerns on embodiment of this invention. It is sectional drawing of the jig for rotation (bar member for extension) and the jig for support (cylindrical member for extension) concerning the embodiment of the present invention. It is an operation schematic diagram of a tube closure instrument concerning an embodiment of the present invention. It is a figure which shows the operation procedure of the pipe | tube obstruction | occlusion instrument which concerns on embodiment of this invention. It is a figure which shows the operation procedure of the pipe | tube obstruction | occlusion instrument which concerns on embodiment of this invention.

  A pipe closing device 1 according to the present invention is a tool for temporarily closing a pipe such as a gas pipe, and a new pipe is connected to the pipe to be closed and has an inner diameter larger than that of the pipe to be closed. Even if a small part occurs, it is configured to be pulled out of the pipe. Below, embodiment of the tube closure instrument concerning the present invention is described with reference to drawings.

  In the following, a pipe to be closed by the pipe closing device 1 is referred to as “existing pipe”, and a new pipe newly connected to the existing pipe is referred to as “new pipe”. That is, in the present embodiment, the existing pipe corresponds to the “first pipe” in the present invention, and the new pipe corresponds to the “second pipe” in the present invention. A joint is interposed between the existing pipe and the new pipe, and the joint corresponds to the “pipe” in the present invention.

1. Overview of Tube Closure Device As shown in FIG. 1, a tube closure device 1 according to the present embodiment is composed of three members: a main body portion 2, a rotation jig 3, and a support jig 4. The main body 2 is mainly composed of two disc bodies, a first disc body 11 and a second disc body 12 (see FIG. 2), and a ring-like shape interposed between the two disc bodies. A cylindrical seal portion 5 made of an elastic body is provided. Further, the main body 2 includes a main shaft 7 that is fixed to the first disc body 11 and protrudes from the seal portion 5, and a cylindrical portion 6 that is fixed to the second disc body 12 and disposed on the outer peripheral surface of the main shaft 7. ing. As will be described in detail later, the main body 2 is configured such that the outer diameter of the elastic body of the seal portion 5 is expanded or contracted by rotating the main shaft 7 relative to the cylindrical portion 6. The rotation jig 3 and the support jig 4 are members for enabling the main shaft 7 to rotate relative to the cylinder portion 6 from a position away from the main body portion 2. The rotating jig 3 is connected to the main shaft 7 and the supporting jig 4 is connected to the cylindrical portion 6 so as to be integrally rotatable.

  In the present embodiment, the first disk body 11 corresponds to “one disk body” in the present invention, and the second disk body 12 corresponds to “the other disk body” in the present invention. The main shaft 7 corresponds to the “disc body side bar-shaped member” in the present invention, and the rotating jig 3 corresponds to the “extension bar-shaped member” in the present invention. That is, the main shaft 7 and the rotating jig 3 correspond to the “bar-shaped member” in the present invention. Further, the cylindrical portion 6 corresponds to a “disk body side cylindrical member” in the present invention, and the supporting jig 4 corresponds to an “extending cylindrical member” in the present invention. That is, the cylindrical part 6 and the supporting jig 4 correspond to the “cylindrical member” in the present invention.

2. 2. Details of tube closure device 2-1. Main Body FIG. 2 shows a cross-sectional view of the main body 2 in a direction parallel to the main shaft 7. FIG. 2A shows a state in which the seal portion 5 has not been enlarged or reduced in diameter, and FIG. 2B shows a state in which the seal portion 5 has been reduced in diameter. The left side in FIG. 2 corresponds to the existing piping side in a state where the tube closing device 1 is inserted into the piping, and the right side in FIG. 2 corresponds to the new piping side. Hereinafter, the left side in FIG. 2 is referred to as “upstream side” and the right side is referred to as “downstream side”. In addition, the radial direction of the existing pipe (direction perpendicular to the main shaft 7) is simply referred to as “radial direction”, and the axial direction of the existing pipe (direction parallel to the main shaft 7) is simply referred to as “axial direction”. The circumferential direction of the existing pipe (the circumferential direction of the main shaft 7) is simply referred to as “circumferential direction”.

2-1-1. Configuration of Seal Part The seal part 5 included in the main body part 2 includes a first disc body 11 fixed to the upstream end of the main shaft 7 so as to form an airtight structure, and a second disk body fixed to the upstream end of the cylinder part 6. A disc body 12 and a seal member 13 interposed between the first disc body 11 and the second disc body 12 are provided. The first disc body 11 is fixed at the center so that the main shaft 7 protrudes downstream. The outer diameter of the 1st disc body 11 is formed smaller than the innermost peripheral diameter of any existing piping, new piping, and the joint used at the time of connection of existing piping and new piping. On the other hand, the second disc body 12 is provided with a through hole 21 at the center, and the main shaft 7 passes through the through hole 21. Moreover, it fastens with the volt | bolt so that the cylinder part 6 may protrude in the 2nd disc body 12 downstream. The outer diameter of the second disc body 12 is the same as that of the first disc body 11 than the innermost peripheral diameter of the existing pipe, the new pipe, and the joint used when connecting the existing pipe and the new pipe. It is formed small.

  The seal member 13 is formed in a hollow donut shape in which a cross-sectional shape in a direction parallel to the main shaft 7 is a U-shape opened toward the radially inner side of the existing pipe. The seal member 13 is configured such that the innermost peripheral diameter of the seal member 13 is larger than the outer diameter of the cylindrical portion 6 when attached to the seal portion 5. Further, in the present embodiment, the seal member 13 is attached to the seal portion 5 and is configured so that the outermost peripheral diameter in the natural state is smaller than the inner diameter of the existing pipe and larger than the inner diameter of the new pipe. In the present embodiment, the seal member 13 is made of an elastic body. As the elastic body used for the seal member 13, for example, nitrile rubber is preferably used.

  In the present embodiment, the seal portion 5 includes a plurality of seal members 13 arranged in the axial direction. With such a configuration, when the pipe is closed with the pipe closing device 1, the center axis of the pipe and the central axis of the pipe closing device 1 are suppressed from shifting, and the pipe can be appropriately closed. Specifically, the seal portion 5 includes an intermediate disk body 23 between the first disk body 11 and the second disk body 12, and the space between the first disk body 11 and the intermediate disk body 23. The first elastic body 22 is provided, and the second elastic body 24 is provided between the second disk body 12 and the intermediate disk body 23. The intermediate disc body 23 includes a through hole having a diameter larger than the outer diameter of the main shaft 7 and the cylindrical portion 6, and the outer diameter is the same as that of the first disc body 11 and the second disc body 12. Is formed.

  The first elastic body 22 includes a cylindrical first side surface portion 22b extending in the axial direction, a ring-shaped first upstream end portion 22a extending radially inward from the upstream end of the first side surface portion 22b, The ring-shaped first downstream end portion 22c extends radially inward from the downstream end of the first side surface portion 22b.

  The upstream end surface of the first upstream end portion 22 a abuts on the downstream end surface of the first disc body 11, and the downstream end surface of the first upstream end portion 22 a abuts on the pressing tool 14. The first upstream end portion 22a is sandwiched by bolts so as to form an airtight structure between the first disc body 11 and the pressing tool 14. As the pusher 14, the radially extending portion (first upstream end 22a, first downstream end 22c, second upstream end 24a, and second downstream end 24c described later) of the seal member 13 is axially disposed. It is possible to use a metal ring-shaped member that can be pressed in the entire circumferential direction. Further, the downstream end surface of the first downstream end portion 22c is in contact with the upstream end surface of the intermediate disc body 23, and the upstream end surface of the first downstream end portion 22c is in contact with another pressing tool 14. . The first downstream end portion 22c is sandwiched between the intermediate disc body 23 and the pressing tool 14 by bolts.

  The second elastic body 24 includes a cylindrical second side surface portion 24b extending in the axial direction, a ring-shaped second upstream end portion 24a extending radially inward from the upstream end of the second side surface portion 24b, The ring-shaped second downstream end portion 24c extends radially inward from the downstream end of the second side surface portion 24b.

  The upstream end surface of the second upstream end portion 24 a abuts on the downstream end surface of the intermediate disc body 23, and the downstream end surface of the second upstream end portion 24 a abuts on the pressing tool 14. The part 24a is sandwiched between the intermediate disc body 23 and the pressing tool 14 by bolts. Further, the upstream end surface of the second downstream end portion 24 c is in contact with the pressing tool 14, and the downstream end surface of the second downstream end portion 24 c is in contact with the upstream end surface of the second disc body 12. The second downstream end 24c is sandwiched between the pressing tool 14 and the second disc body 12 by a bolt.

  As described above, the seal portion 5 includes the seal member 13, the first disk body 11, the second disk body 12, and the intermediate disk body 23. Furthermore, in this embodiment, when the 2nd disc body 12 pulls out the pipe | tube closure apparatus 1 from piping to the side surface (downstream side surface) on the opposite side to the 1st elastic body 22 and the 2nd elastic body 24. The cover part 15 for suppressing that the 2nd disc body 12 contacts a piping directly is provided. The cover part 15 consists of an elastic body. As the elastic body used for the cover portion 15, for example, nylon is suitable. The cover portion 15 is formed in a ring shape as a whole, and the outer peripheral portion on the downstream end side is formed in a taper shape. In the present embodiment, the inner diameter of the cover portion 15 is formed larger than the outer diameter of the cylinder portion 6, and the outer diameter of the cover portion 15 is outside the first disc body 11 and the second disc body 12. It is formed to be the same as the diameter. The cover portion 15 is fastened to the second disc body 12 with bolts.

2-1-2. Next, the main shaft 7 and the cylindrical portion 6 projecting downstream from the seal portion 5 will be described. The main shaft 7 and the cylindrical portion 6 are arranged coaxially, and the main shaft 7 is rotatable relative to the cylindrical portion 6 in the circumferential direction (in other words, the cylindrical portion 6 is rotatable relative to the main shaft 7 in the circumferential direction). In addition, it is configured to be relatively movable in the axial direction (direction parallel to the central axis of the main shaft 7) with the rotation. In the present embodiment, in order to make the main shaft 7 relatively rotatable with respect to the tube portion 6, the tube closing device 1 is fixed in the axial direction with respect to the tube portion 6 and is connected to the tube portion 6 so as to be relatively rotatable in the circumferential direction. An operation unit 8 is provided. The main shaft 7 is engaged with the interconnection operation unit 8, and the interconnection operation unit 8 rotates in the circumferential direction and simultaneously rotates in the opposite direction to the interconnection operation unit 8. That is, the main shaft 7 is configured to rotate relative to the cylindrical portion 6 when the interconnection operation portion 8 rotates in the circumferential direction. Below, the detail of the main shaft 7, the cylinder part 6, and the interconnection operation part 8 is demonstrated.

  First, the cylinder part 6 will be described. The cylindrical portion 6 is fastened with a bolt to the peripheral portion of the through hole 21 of the second disk body 12 so as to protrude downstream from the second disk body 12, and penetrates the radially inner side of the cover portion 15. Are arranged as follows. The inner diameter of the cylindrical portion 6 is formed to be larger than the outer diameter of the main shaft 7.

  In addition, a plurality of support locking devices 61 for locking the support jig 4 are provided on the outer peripheral surface of the cylindrical portion 6 so as to be evenly distributed in the circumferential direction. In the present embodiment, the cylindrical portion 6 includes two supporting locking members 61 that are 180 degrees apart from each other in the circumferential direction, and the supporting locking members 61 protrude radially outward from the cylindrical portion 6. It consists of a cylindrical pin.

  On the outer peripheral surface of the cylindrical portion 6, there is provided a support guide portion 62 for fixing the radial position of the support jig 4 so that the axis of the support jig 4 and the axis of the main shaft 7 coincide with each other. . The support guide portion 62 is formed in a cylindrical shape having an outer diameter that is the same as the inner diameter of the support jig 4, and is provided integrally on the outer peripheral surface of the tube portion 6. As a material of the supporting guide portion 62, for example, an elastic body is preferably used. The support guide part 62 is arranged at a position upstream of the support locking tool 61.

  Furthermore, the cylinder part 6 is provided with the protrusion part 63 in the outer peripheral surface of a downstream end. The protrusion 63 is formed of a cylindrical member formed so as to extend in the circumferential direction and the radial direction with respect to the cylindrical portion 6. The protruding portion 63 is fixed in the axial direction with respect to the cylindrical portion 6. In the present embodiment, the protruding portion 63 is formed by two nuts (so-called double nuts) that are overlapped in the axial direction and fitted to the outer peripheral portion of the cylindrical portion 6.

  Next, the main shaft 7 will be described. The main shaft 7 is fixed to the center of the first disk body 11 so as to protrude from the first disk body 11 toward the downstream side, and includes a first elastic body 22, an intermediate disk body 23, and a second elastic body. 24, the 2nd disc 12, the cover part 15, and the cylinder part 6 are arrange | positioned so that the radial inside may be connected.

The main shaft 7 is composed of two parts: a first shaft portion 7a fixed to the first disc body 11 and a second shaft portion 7b fixed to the downstream side of the first shaft portion 7a. The 1st axial part 7a consists of a pipe-shaped member, and is welded with the 1st disc body 11 in the upstream end. The second shaft portion 7b is a rod-shaped member formed so that the outer diameter is slightly smaller than the outer diameter of the first shaft portion 7a, and the outer peripheral surface thereof is fitted with the inner peripheral surface of the interconnection operation portion 8. A mating portion 71 is formed. In the present embodiment, the fitting portion 71 is formed with threads over almost the entire area. The fitting portion 71 includes a portion where a part of the thread is not formed. Specifically, when the outer diameter of the seal member 13 is the same as the inner diameter of the existing pipe, when the outer diameter of the seal member 13 is the same as the inner diameter of the new pipe, and when connecting the existing pipe and the new pipe, As for the portion corresponding to the position of the interconnection operation unit 8 when it is the same as the inner diameter, the thread of the fitting unit 71 is not formed. With such a configuration, the user of the tube closing device 1 can grasp the approximate outer diameter of the seal member 13 from the feeling received by the hand when the linkage operation unit 8 is rotated.

  A fixed portion 72 is provided on the outer peripheral surface of the downstream end of the second shaft portion 7b. The fixed portion 72 is made of a cylindrical member formed so as to extend in the circumferential direction and the radial direction with respect to the main shaft 7. The fixing portion 72 is fixed in the axial direction with respect to the main shaft 7. In the present embodiment, the fixing portion 72 is formed by two nuts (so-called double nuts) that are fitted in the outer peripheral portion (fitting portion 71) of the main shaft 7 so as to overlap in the axial direction.

  The downstream end of the first shaft portion 7a and the upstream end of the second shaft portion 7b are integrally joined to form an airtight structure. In the present embodiment, the first shaft portion 7a and the second shaft portion 7b are joined by welding. With such a configuration, the fitting portion 71 of the main shaft 7 has an upstream end defined by the downstream end of the first shaft portion 7 a and a downstream end defined by the fixing portion 72.

  Finally, the interconnection operation unit 8 will be described. The linkage operation unit 8 is a member whose axial position is fixed with respect to the cylindrical part 6 and is configured to be relatively rotatable with respect to the main shaft 7 and the cylindrical part 6, and is mainly rotationally fitted with the axial direction fixing part 8 a. It is comprised from two members with the joint part 8b.

  The axial fixing portion 8a includes a cylindrical side surface portion 81 extending in the axial direction, a cylindrical upstream end portion 82 joined to the upstream end of the side surface portion 81, and extending radially inward from the side surface portion 81. The cylindrical downstream end portion 83 extends from the downstream end of the side surface portion 81 to the inner side in the radial direction than the side surface portion 81.

  The side surface portion 81 is a cylindrical member that is formed so that the inner diameter is larger than the outer diameter of the protruding portion 63 of the cylindrical portion 6 and is longer than the protruding portion 63 in the axial direction. . The upstream end portion 82 is a cylindrical member joined to the upstream end of the side surface portion 81, and has an outer diameter that is the same as that of the side surface portion 81, and an inner diameter that is greater than the outer diameter of the protruding portion 63 of the cylindrical portion 6. Is formed to be smaller. Further, the inner diameter of the upstream end portion 82 is formed larger than the outer diameter of the cylindrical portion 6. The downstream end portion 83 is a cylindrical member joined to the downstream end of the side surface portion 81, and has an outer diameter that is the same as that of the side surface portion 81, and an inner diameter that is the outer diameter of the protruding portion 63 of the cylindrical portion 6. It is formed to be smaller than that.

  The side part 81, the upstream end part 82, and the downstream end part 83 are integrally fastened by bolts. In addition, in order to prevent dust and the like from entering the inside of the axial fixing portion 8a from the gap generated between the upstream end portion 82 and the cylindrical portion 6, the upstream end surface of the upstream end portion 82 has a ring shape. The formed dustproof sheet 84 is fixed.

  The rotation fitting portion 8b is a cylindrical member that is fitted to the fitting portion 71 of the main shaft 7 so as to be relatively rotatable. In the present embodiment, the rotation fitting portion 8b is formed with a screw groove that fits the thread of the fitting portion 71 on the inner peripheral surface. In addition, a plurality of rotation locking tools 85 for locking the rotation jig 3 are provided on the outer peripheral surface of the rotation fitting portion 8b evenly distributed in the circumferential direction. In the present embodiment, the rotation fitting portion 8b includes two rotation locking members 85 that are separated from each other by 180 degrees in the circumferential direction, and the rotation locking member 85 is arranged in the radial direction from the rotation fitting portion 8b. It consists of a cylindrical pin that protrudes outward.

  The rotation fitting portion 8b is integrally joined to the axial direction fixing portion 8a. In the present embodiment, the downstream end of the axial direction fixing portion 8a is joined to the upstream end of the rotation fitting portion 8b.

2-2. Configuration of Drawing Tool and Supporting Jig FIG. 3 is a cross-sectional view of the main body 2 with the rotating jig 3 and the supporting jig 4 attached thereto. The rotating jig 3 is formed in a cylindrical shape as a whole and is locked to the main shaft 7 so as to rotate integrally with the main shaft 7 of the main body 2. Further, the upstream side of the rotating jig 3 is configured such that the cylindrical portion 6 can be inserted therein. In the present embodiment, the rotation locking groove 31 corresponding to the rotation locking tool 85 provided on the main shaft 7 is provided on the upstream side of the rotation jig 3. The rotation locking groove 31 is formed so as to go from at least the upstream end surface of the rotation jig 3 toward the downstream side. With such a configuration, the rotation jig 3 can be inserted from the downstream side with respect to the main shaft 7 and can be locked so as to rotate integrally with the main shaft 7.

  Further, the rotation jig 3 includes a second support guide portion 32 for fixing the radial position of the support jig 4 on the downstream side of the rotation locking groove 31. The second support guide portion 32 is formed in the same cylindrical shape as the inner diameter of the support jig 4. In the present embodiment, a plurality of second support guide portions 32 are provided on the downstream side of the rotation locking groove 31. With such a configuration, the supporting jig 4 can be supported at a plurality of locations in the axial direction by both the supporting guide portion 62 and the second supporting guide portion 32 of the cylindrical portion 6.

  Furthermore, the rotating jig 3 includes a rotating handle portion 33 for rotating the rotating jig 3 in the circumferential direction on the outer peripheral surface on the downstream side. The rotation handle portion 33 is a columnar member that protrudes radially outward with respect to the rotation jig 3. In the present embodiment, the rotation handle portion 33 is constituted by a single rod-like member that penetrates the rotation jig 3 in the radial direction.

  The supporting jig 4 is formed in a cylindrical shape and is locked to the cylindrical portion 6 so as to rotate integrally with the cylindrical portion 6 of the main body portion 2. The inner diameter of the supporting jig 4 is formed to be larger than the outer diameter of the rotating jig 3. In the present embodiment, a support locking groove 41 corresponding to the support locking tool 61 provided in the cylindrical portion 6 is provided on the upstream side of the support jig 4. The support locking groove 41 is formed so as to go from the upstream end face of the support jig 4 toward the downstream side. With such a configuration, the supporting jig 4 can be inserted from the downstream side with respect to the cylindrical portion 6 and can be locked so as to rotate integrally.

  The support jig 4 includes a support handle portion 42 on the downstream outer peripheral surface for the user to support the support jig 4 so that the support jig 4 does not rotate. In the present embodiment, the support handle portion 42 is formed by a plurality of rod-like members protruding in the radial direction.

3. Operation of the tube closing device In the following description of the operation of the tube closing device, the outer diameter of the seal member 13 in the natural state posture is D ₀ , the inner diameter of the existing piping is D 1, and the pipe material used when connecting the existing piping to the new piping The following explanation will be made on the assumption that the following relationship is satisfied, where D ₂ is the innermost peripheral diameter of the first disk body 11 and D ₃ is the outer diameter of the first disk body 11 and the second disk body 12.
D ₁ > D ₀ > D ₂ > D ₃

  As shown in FIGS. 2 (a) and 4 (a), the tube closure device 1 according to the present invention has a distance between the first disc body 11 and the second disc body 12 during storage. By setting the first elastic body 22 and the second elastic body 24 to a natural state separation distance where the first elastic body 22 and the second elastic body 24 are in a natural state, deterioration of the seal member 13 can be suppressed. The posture of the tube closing device 1 at this time is referred to as a natural state posture in the present invention. In the present embodiment, the axial length of the fitting portion 71 is such that the separation distance between the first disk body 11 and the second disk body 12 can be made larger and smaller than the natural state separation distance. And the axial direction position of the interconnection operation part 8 with respect to the fitting part 71 is adjusted.

  In reducing the outer diameter of the tube closing device 1 (reducing the diameter), the user of the tube closing device 1 closes the main shaft 7 in a state where the tube portion 6 is gripped so as not to rotate in the circumferential direction. Relative rotation is performed in the opposite direction to the case (the main shaft 7 is rotated with respect to the cylindrical portion 6 in the reverse direction to the case where the pipe is closed). Thereby, the main shaft 7 slides upstream with respect to the cylindrical portion 6, the first disc body 11 fixed to the upstream end of the main shaft 7, and the second disc fixed to the upstream end of the cylindrical portion 6. The axial distance from the body 12 is increased, and the outer diameter of the seal member 13 sandwiched between the first disk body 11 and the second disk body 12 is connected to the existing pipe and the new pipe. The inner diameter of the pipe material used can be equal to or smaller than the outer diameter of the first disk body 11 and the second disk body 12. More specifically, as shown in FIGS. 2 (b) and 4 (b), the first side surface portion 22b and the second side surface portion 24b receive tensile stress from both sides in the axial direction and move radially inward. Pulled to be less than the inner diameter of the new pipe.

  When the outer diameter of the tube closing device 1 is increased (expanded), the user of the tube closing device 1 rotates the main shaft 7 in the circumferential direction while holding the tube portion 6 so as not to rotate in the circumferential direction. (The main shaft 7 is rotated forward with respect to the cylindrical portion 6). In the present embodiment, the user rotates the interconnection operation unit 8 in the circumferential direction while holding the cylinder unit 6, so that the main shaft 7 fitted to the interconnection operation unit 8 is attached to the cylinder unit 6. Relative rotation. As a result, the main shaft 7 slides downstream with respect to the cylindrical portion 6, the first disc body 11 fixed to the upstream end of the main shaft 7, and the second disc fixed to the upstream end of the cylindrical portion 6. The axial separation distance with the body 12 is made smaller than the natural state separation distance, and the outer diameter of the seal member 13 sandwiched between the first disk body 11 and the second disk body 12 is set to the inner diameter of the existing pipe. Can be the same. More specifically, as shown in FIG. 4 (c), the first side surface portion 22b and the second side surface portion 24b of the seal member 13 receive compressive stress from both sides in the axial direction and bulge outward in the radial direction. It is the same as the inner diameter of the existing piping.

  These operations can be performed in the same manner even when the rotation jig 3 is attached to the main shaft 7 and the support jig 4 is attached to the cylindrical portion 6.

4). Pipe connection method using a tube closing device Finally, using the tube closing device 1 according to the present invention, the inner diameter is the minimum inner diameter of the tube material through the tube having a portion having an inner diameter smaller than that of the existing piping. A pipe connection method for connecting a larger new pipe will be described with reference to FIGS.

  Hereinafter, a case where a steel pipe is installed as the existing pipe A and a resin pipe is connected as the new pipe B on the downstream side of the existing pipe A will be described as an example. In addition, when connecting the existing pipe A and the new pipe B, a steel joint in which the inner diameter on the upstream side is the same as the existing pipe A and the inner diameter on the downstream side is the same as the outer diameter of the new pipe B as a pipe material. C is used. As an example of the resin pipe, a polyethylene pipe effective for low-pressure mist prevention measures is used.

First step (insertion step)
As shown in FIG. 5A, the seal member 13 is maintained in a natural state (the outer diameter of the seal member 13 is set to D ₀ ), and the main shaft 7, the cylindrical portion 6, the first disc body 11, and the second The disc body 12 is inserted into the existing pipe A.

Second step (first piping blockage step)
As shown in FIG. 5 (b), the outer diameter of the seal member 13 is adjusted by bringing the first disc body 11 and the second disc body 12 in the state of being inserted into the existing pipe A in the insertion step close to each other. The existing pipe A is closed with the same inner diameter (D ₁ ) as A. In the present embodiment, the user of the tube closing device 1 rotates the main shaft 7 relative to the cylindrical portion 6 by hand tightening. Thereby, the diameter of the seal member 13 of the tube closing device 1 is increased, and the existing pipe A is closed.

Third process (pipe connection process)
After performing the first pipe closing process, the new pipe B is connected to the existing pipe A via the joint C as shown in FIG. In the present embodiment, the joint C is configured to be able to connect a new pipe B having substantially the same diameter as the existing pipe A, and is connected to the downstream end of the existing pipe A by welding. Since the new pipe B cannot be connected to the joint C by welding, the new pipe B is inserted inside the joint C, and at the position overlapping with the joint C in the axial direction on the inner side, stress is applied to the new pipe B from the inside in the radial direction. In addition, a stiffener D (so-called stiffener) for press-contacting the newly installed pipe B to the joint C is attached. For this reason, the minimum inner diameter (D ₂ ) in the joint C is smaller than the inner diameter (D ₁ ) of the existing pipe A by at least the thickness of the stiffener D.

Fourth step (extension step)
After executing the pipe connecting step, as shown in FIG. 6A, the rotating jig 3 is integrally connected to the main shaft 7, and the supporting jig 4 is integrally connected to the cylindrical portion 6. In the present embodiment, first, the supporting jig 4 is inserted from the downstream side of the new pipe B, and the supporting locking groove 41 of the supporting jig 4 is locked to the supporting locking tool 61 of the cylindrical portion 6. . Subsequently, the rotation jig 3 is inserted, and the rotation locking groove 31 of the rotation jig 3 is locked to the rotation locking tool 85 of the interconnection operation unit 8.

Fifth process (diameter reduction process)
After executing the extending step, as shown in FIG. 6B, the first disc body 11 and the second disc body 12 are separated from each other using the rotation jig 3 and the support jig 4, and the sealing member is used. The outer diameter of 13 is set to be equal to or smaller than the minimum inner diameter (D ₂ ) of the joint C. In the present embodiment, while holding the supporting jig 4 so as not to rotate in the circumferential direction, the rotating jig 3 is rotated in the direction opposite to the first pipe closing step. In this embodiment, the user of the tube closing device 1 rotates the support handle portion 42 of the rotation jig 3 with the other hand while holding the support handle portion 42 of the support jig 4 with one hand. . As a result, the diameter of the tube closing device 1 is reduced and becomes smaller than the minimum inner diameter of the joint C (the inner diameter of the stiffener D, D ₂ ).

Sixth step (removal step)
As shown in FIG. 6C, the pipe closing device 1 in a reduced diameter state is taken out from the existing pipe A, the joint C, and the new pipe B. Since the outer diameter of the tube closing device 1 is smaller than the inner diameter (D ₂ ) of the stiffener D, the tube closing device 1 is taken out of the new pipe B without being blocked by the stiffener D. Can do.

  As described above, the pipe closing device 1 according to the present invention is used to perform the above-described process, so that the existing pipe A is connected to the new pipe B made of a resin pipe by simply welding one joint C. Therefore, the material cost required for the pipe replacement work can be reduced at a low cost, and the workability can be improved, such as the time and space required for the pipe connection work being reduced.

[Other Embodiments]
(1) In the said embodiment, the example in case the main-body part 2 of the pipe | tube closure instrument 1 is provided with the interconnection operation part 8 between the cylinder part 6 and the main axis | shaft 7 was demonstrated. However, the embodiment of the present invention is not limited to this. Therefore, for example, the main body unit 2 may not include the interconnection operation unit 8, and the cylindrical unit 6 and the main shaft 7 may be directly screwed to be relatively rotated in the circumferential direction and configured to be relatively movable in the axial direction. In this case, the inner peripheral surface of the cylindrical portion 6 and the outer peripheral surface of the main shaft 7 are threaded, and a rotation locking tool 85 for directly locking the rotation jig 3 is provided on the downstream side of the main shaft 7. It is preferable.

(2) In the above embodiment, an example in which the joint C having a smaller minimum inner diameter than the existing pipe A and the new pipe B is used as the pipe material to be passed through the pipe closing device 1 has been described. However, the embodiment of the present invention is not limited to this. That is, the present invention can be suitably used if a pipe material having an inner diameter smaller than that of the existing pipe A is connected to the existing pipe A. Therefore, for example, a new pipe B having a smaller inner diameter than the existing pipe A may be used as the pipe material. As an example of this, a case where a new pipe B having an inner diameter smaller than that of the existing pipe A is directly welded to the existing pipe A is assumed.

(3) In the said embodiment, the example in case the 2nd disc body 12 was provided with the ring-shaped cover part 15 formed in the taper shape was demonstrated. However, the embodiment of the present invention is not limited to this. That is, the second disc body 12 may be configured not to include the cover portion 15 or to include a cover portion having a different shape.

(4) In the above-described embodiment, the seal member 13 includes the intermediate disk body 23 between the first disk body 11 and the second disk body 12, and two elastic bodies (the first elastic body 22 and the first elastic body 22). An example in which the second elastic body 24) is provided has been described. However, the embodiment of the present invention is not limited to this. That is, a configuration in which only one seal member 13 includes an elastic body or a configuration in which three or more elastic bodies are provided may be employed.

(5) In the above embodiment, the tube closing device 1 includes the support jig 4 connected to the cylindrical portion 6 so as to be integrally rotatable, and the rotation jig 3 connected to the main shaft 7 so as to be integrally rotatable. An example was explained. However, the embodiment of the present invention is not limited to this. That is, the tube closing device 1 may be configured not to include the rotating jig 3 and the supporting jig 4. In this case, it is preferable that the cylindrical portion 6 and the main shaft 7 are formed to have an axial length that protrudes from the new pipe B in a state where the new pipe B is connected to the existing pipe A. Moreover, when using such a pipe | tube closure instrument 1, when connecting the existing piping A and the new piping B, it is necessary to perform a 4th process and a 5th process among the said 1st processes-6th processes. Absent.

(6) In the said embodiment, the example in case the rotation jig 3 and the main axis | shaft 7 were provided with the rotation handle part 33 and the support handle part 42 for rotation operation was demonstrated. However, the embodiment of the present invention is not limited to this. That is, the rotation jig 3 and the main shaft 7 may be configured not to include the rotation handle portion 33 and the support handle portion 42 for rotation operation.

  The present invention is applicable to a tube closing device used for closing a pipe.

1: Pipe closing device 3: Rotating jig (extending rod-like member, rod-like member)
4: Supporting jig (extension tubular member, cylindrical member)
6: Cylinder part (disc body side rod-like member, rod-like member)
7: Spindle (disc body side cylindrical member, cylindrical member)
11: 1st disc body (one disc body)
12: 2nd disc body (the other disc body)
15: Cover part 22: First elastic body 23: Intermediate disc body 24: Second elastic body 33: Handle part for rotation 42: Support handle part A: Existing pipe (first pipe)
B: Newly installed piping (second piping)
C: Fitting

Claims (7)

Two disc bodies with an outer diameter D ₃ ,
At least one ring-shaped elastic body interposed between the two disc bodies and having an outer diameter D ₀ in a natural state;
A rod-shaped member fixed to one disk body and penetrating through the elastic body and the other disk body;
A cylindrical member that is fixed to the other disc body, is rotatable relative to the rod-like member on the outer peripheral surface of the rod-like member, and is relatively movable in a direction parallel to the rod-like member;
With respect to a natural state separation distance that is a distance between the one disk body and the other disk body in a natural state posture in which the elastic body is in a natural state by the positive rotation of the cylindrical member with respect to the rod-shaped member. Te, by reducing the distance between the disk body and the other disk body of the one, a tube closure device for the outer diameter can and the closing target piping inner diameter D ₁ or more of said elastic body,
Due to the reverse rotation of the cylindrical member with respect to the rod-like member, the separation distance between the one disk body and the other disk body is increased with respect to the natural state separation distance, and the inner diameter D ₂ less the diameter passage target of the tube, the _{D 0, D 1, D 2} , D 3 satisfy the following relation tube closure device can and the outer diameter D ₃ or more of said disk body.
D ₁ > D ₀ > D ₂ > D ₃ 2. The tube closure device according to claim 1, wherein the other disk body includes a ring-shaped cover portion having an outer diameter D ₃ and a tapered outer peripheral portion on a side surface opposite to the elastic body. . Outer diameter with an intermediate disc body D _3, and between the other disc of the one disk body and said intermediate disk body between the disk body of the other and the disk body of the one The tube closing instrument according to claim 1 or 2, wherein the elastic body is provided between a body and the intermediate disk body. The rod-shaped member is composed of a disk body-side rod-shaped member fixed to the one disk body, and an extension rod-shaped member connected to the non-disk body side of the disk body-side rod-shaped member so as to be integrally rotatable,
A cylindrical body-side cylindrical member fixed to the other disk body; and an extending cylindrical member connected to the non-disk body side of the disk-side cylindrical member so as to be integrally rotatable. The tube closure device according to any one of claims 1 to 3.   The tube closing instrument according to claim 4, wherein each of the extending rod-like member and the extending cylindrical member is provided with a handle portion for rotating operation. Using a tube closure device according to any one of claims 1 to 3, the first pipe inner diameter D ₁ of the said closed object, through the joint is said tubing comprising a portion of the inner diameter D _2, A pipe connection method for connecting a second pipe to be connected whose inner diameter is larger than D ₂ ,
An insertion step of inserting the disk body side rod-shaped member, the disk body side cylindrical member, and the one and other disk bodies into the first pipe while maintaining the elastic body in the natural state;
The outer diameter of the first insertion state in the pipe is the in close proximity to one and the other disc body the elastic body as the same as the inner diameter D ₁ of the said first pipe in the insertion step, the first A first pipe closing step for closing the pipe;
After performing the first pipe closing step, a pipe connecting step of connecting the second pipe to the first pipe via the joint;
After executing the tube connection process, it executes the one and the other disc diameter step of the outer diameter of the elastic body by separating the body and the inner diameter D ₂ less of the tube member,
A pipe connection method for executing a step of taking out a pipe closing device in a reduced diameter state from the first pipe, the joint, and the second pipe. Using a tube closure device according to claim 4 or 5, wherein, in the first pipe inner diameter D ₁ of the closing target, through the joint is said tubing comprising a portion of the inner diameter D _2, the inner diameter is the D A pipe connection method for connecting a second pipe to be connected that is greater than ₂ ,
An insertion step of inserting the disk body side rod-shaped member, the disk body side cylindrical member, and the one and other disk bodies into the first pipe while maintaining the elastic body in the natural state;
The outer diameter of the first insertion state in the pipe is the in close proximity to one and the other disc body the elastic body as the same as the inner diameter D ₁ of the said first pipe in the insertion step, the first A first pipe closing step for closing the pipe;
After performing the first pipe closing step, a pipe connecting step of connecting the second pipe to the first pipe via the joint;
After executing the tube connecting step, the extension rod-shaped member is integrally connected to the disk-body-side rod-shaped member, and the extension step is integrally connected to the disk-body-side cylindrical member;
After executing the extension step, the extension rod-shaped member and the extension cylinder-shaped member are used to separate the one and the other disk bodies so that the outer diameter of the elastic body is set to the inner diameter D _{2 of the} tube material. The following diameter reduction process is executed,
A pipe connection method for executing a step of taking out a pipe closing device in a reduced diameter state from the first pipe, the joint, and the second pipe.

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