JP5372658B2 - Pipe joint movement prevention device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint movement preventer capable of maintaining the watertightness of a movement prevention element while permitting a predetermined length of relative movement between a spigot pipe and a faucet pipe in the direction of pipe axis, and a method thereof. <P>SOLUTION: The pipe joint movement preventer includes: a movement prevention element 13 comprising a first engagement member 17 secured to a predetermined portion 26 of the inner peripheral surface of a spigot section 3 and a second engagement member 18 secured to a predetermined portion 27 of the inner peripheral surface of a faucet section 5 in such a way as to be engageable with the first engagement member 17, the movement prevention element 13 being provided on the inner peripheral surfaces of both sections 3, 5 along their circumferential direction; and a cylindrical element 14 disposed in a position circumferentially opposite to the inner peripheral surfaces of the both sections 3, 5 and covering the movement prevention element 13 in a watertight manner toward the inner peripheral surfaces of the both sections 3, 5. The engagement members 17, 18 have respective regulating sections 17, 18c for regulating their relative movement in the direction of pipe axis in such a manner as to permit the relative movement by a predetermined length. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pipe joint that includes an insertion portion of an insertion tube, a reception portion of a reception tube into which the insertion portion is inserted, and a seal member that seals between the two portions. TECHNICAL FIELD The present invention relates to a pipe joint movement preventing tool and a method for preventing the relative movement of both mouth parts in the pipe axis direction, which are installed on the inner peripheral surface of the pipe part in the pipe axis direction.

  The conventional pipe joint movement preventing tool fixes the first lock member (movement prevention body) and the second lock member (movement prevention body) to the inner peripheral surface of the insertion portion and the inner peripheral surface of the receiving portion, When the first lock member and the second lock member are sealed by a seal member provided on the outer peripheral surface of the joint ring (tubular body), and an unexpected external force such as an earthquake acts on the existing fluid pipe, The lock member and the second lock member are brought into contact with the first separation regulating surface (movement preventing body) formed on the joint ring, thereby preventing the insertion portion and the reception portion from being separated from each other. (For example, refer to Patent Document 1).

JP 2007-113644 (page 9, FIG. 4)

  However, in Patent Document 1, the first lock member (movement prevention body) and the second lock member (movement prevention body) are joined by an unexpected external force such as an earthquake acting on the existing fluid pipe. When it comes into contact with the first separation regulating surface (movement preventing body) formed on the ring (cylindrical body), the impact due to the contact is exerted on the seal member provided on the joint ring, and the seal member causes the first There is a problem that the watertightness of the first lock member and the second lock member cannot be maintained.

  The present invention has been made paying attention to such a problem, and maintains the watertightness of the movement preventing body while allowing a predetermined length of relative movement of the insertion tube and the receiving tube in the tube axis direction. It is an object of the present invention to provide a pipe joint movement preventing device and method thereof.

In order to solve the above problems, the pipe joint movement preventing device of the present invention is
In the pipe joint provided with the insertion portion of the insertion tube, the reception portion of the reception tube into which the insertion portion is inserted, and a seal member that seals between the two opening portions, the both opening portions A pipe joint movement preventing tool that is constructed over the inner peripheral surface of the pipe in the pipe axis direction and prevents relative movement of the two ports in the pipe axis direction,
A first engagement member fixed to a predetermined location on the inner peripheral surface of the insertion port, and a second engagement fixed to a predetermined location on the inner peripheral surface of the receiving port so as to be engageable with the first engagement member. The movement preventing body, which is made of a joint member and is provided along the circumferential direction on the inner circumferential surface of the two mouth portions, and is disposed at a facing position facing the inner circumferential surface of the both mouth portions in the circumferential direction, and the movement A cylindrical body that water-tightly covers the prevention body toward the inner peripheral surface of the both mouths,
Each of the engaging members includes a restricting portion that restricts relative movement in the tube axis direction with respect to each other so as to allow a predetermined length.
According to this feature, even if the insertion tube and the receiving tube try to move relative to each other in the direction of the tube axis due to an unexpected external force such as an earthquake, the first engaging member is controlled by the restricting portions of the both engaging members constituting the movement preventing body. A movement preventing body that allows not only relative insertion of a predetermined length in the tube axis direction but also relative insertion of the insertion portion to which the joint member is fixed and the receiving portion to which the second engagement member is fixed, By water-tightly covering with a separate cylindrical body, the water-tight covering of the movement preventing body can be maintained even if both mouths move relative to each other.

The pipe joint movement preventing device of the present invention is
Each of the engaging members is fixed by welding.
According to this feature, there is no need to perform processing or the like for fixing the engaging member to the insertion portion and the receiving portion in advance, and both the engaging members can be fixed easily and reliably.

The pipe joint movement preventing device of the present invention is
Each of the engaging members constitutes a ridge fixed to the inner peripheral surface along the circumferential direction.
According to this feature, since each engaging member constitutes a ridge fixed to the inner peripheral surface along the circumferential direction, the two mouth portions are relatively moved in the circumferential direction along the mutual ridge. be able to.

The pipe joint movement preventing device of the present invention is
A plurality of ridges constituting each engagement member are fixed to the inner peripheral surface along the circumferential direction, and a gap between adjacent ridges constituting the first engagement member; It is characterized in that gaps between adjacent ridges constituting the second engaging member are formed at different positions in the circumferential direction.
According to this feature, each of the ridges constituting one engaging member applies a force in the circumferential direction to a plurality of ridges across the gap between adjacent ridges constituting the other engaging member. Since they are dispersedly engaged, even if an external force that is biased to a predetermined position in the circumferential direction is applied to both the mouth portions, there is no possibility that an uneven load is applied only to the ridge located at that position.

The pipe joint movement preventing device of the present invention is
At least one of the engaging members includes a breakable portion that can be broken with a force that is smaller than a force of a magnitude that breaks the predetermined portion of the both mouth portions due to relative movement of the both mouth tubes. It is characterized by.
According to this feature, the pipe joint can be used continuously only by exchanging the damaged engagement member without damaging both the mouth portions.

The pipe joint movement preventing method of the present invention is
In the pipe joint provided with the insertion portion of the insertion tube, the reception portion of the reception tube into which the insertion portion is inserted, and a seal member that seals between the two opening portions, the both opening portions A pipe joint movement prevention method for preventing relative movement in the pipe axis direction of the two ports,
Movement prevention comprising a first engagement member fixed to the inner peripheral surface of the insertion portion and a second engagement member fixed to the inner peripheral surface of the receiving portion so as to be engageable with the first engagement member. A movement preventing body installation step for providing a body along the circumferential direction on the inner peripheral surface of the both mouth parts;
Cylindrical body installation which installs the cylindrical body which coats the movement prevention body watertight toward the inner peripheral surface of the two mouth portions at a facing position facing the inner peripheral surface of the two mouth portions in the circumferential direction. It is characterized by comprising a process.
According to this feature, even if the insertion tube and the receiving tube try to move relative to each other in the direction of the tube axis due to an unexpected external force such as an earthquake, the first engaging member is controlled by the restricting portions of the both engaging members constituting the movement preventing body. Installed a movement prevention body that allows not only relative insertion of a predetermined length in the tube axis direction, but also relative insertion of the insertion portion to which the joint member is fixed and the receiving portion to which the second engagement member is fixed. Since the step of performing and the step of installing the cylindrical body that covers the movement preventing body in a water-tight manner are configured separately, the operation can be easily and reliably performed.

(A) is an expanded sectional view which shows the connection state of the insertion part and receiving part in Example 1, (b) is an expanded cross section which shows the state which removed the mortar layer from the insertion part and the receiving part. FIG. (A) is a front view of the divided | segmented circular arc frame, (b) is AA sectional drawing of the circular arc frame in Fig.2 (a). (A) is sectional drawing which shows the state which installed the pipe joint movement prevention tool in both opening parts, (b) is BB sectional drawing in Fig.3 (a). It is an expanded sectional view which shows attachment of the movement prevention body to an insertion part and a receiving part. It is sectional drawing which shows the movement prevention body attached over the insertion part and the receiving part. (A) is a partially expanded sectional view which shows the state which coat | covers the movement prevention body attached over the insertion part and the receiving part with a cylindrical body, (b) is watertight by a cylindrical body. It is a partially expanded sectional view which shows the movement prevention body coat | covered by. It is a partially expanded sectional view which shows the movement prevention body coat | covered watertight with the cylindrical body in Example 2. FIG.

  EMBODIMENT OF THE INVENTION The form for implementing the pipe joint movement prevention tool which concerns on this invention is demonstrated below based on an Example.

  A pipe joint movement preventing tool according to Embodiment 1 will be described with reference to FIGS. 1 to 6. Hereinafter, the left and right sides of FIG. 1, FIG. 2 (b), FIG. 3 (a), and FIGS. 4 to 6 will be described as the tube axis direction side of the pipe joint movement preventing tool. As shown in FIG. 1A, the pipe joint 1 of the existing fluid pipe in the present embodiment includes an insertion port 3 that is one end of the insertion tube 2, and a receiving tube 4 into which the insertion port 3 is inserted. And the sealing member 6 which watertightly seals the opposing surfaces of both the mouth portions 3 and 5, and the insertion tube 2 and the receiving tube 4 are mutually connected. The tube axes are connected in a substantially straight line (not shown).

  The insertion tube 2 and the reception tube 4 in the present embodiment are existing fluid tubes having a relatively large diameter and having an inner diameter that allows an operator or the like to work inside. Further, the insertion tube 2 and the receiving tube 4 are made of a metal material such as ductile cast iron, and the inner peripheral surfaces of the both-end tubes 2 and 4 prevent corrosion of the both-end tubes 2 and 4 due to fluid. For this purpose, mortar layers 7 and 8 are formed.

  Further, a push ring 9 is disposed on the outer peripheral surface of the insertion opening 3, and an insertion hole 9 a formed in the push ring 9 in the tube axis direction and an insertion hole 5 a formed on the outer end of the receiving opening 5. The seal member 6 is pressed and held between the opposed peripheral surfaces of both the mouth portions 3 and 5 by the bolts and nuts 11 inserted into the two.

  Next, the structure of the pipe joint movement preventing tool 12 installed over both the mouth portions 3 and 5 will be described.

  As shown in FIGS. 1 (b), 3 (a), and 3 (b), the pipe joint 1 configured as described above has a mortar layer on the inner peripheral surface at the ends of both the mouth portions 3 and 5. 7 and 8 are removed, and the pipe joint movement preventing device 12 of the present invention is installed over the inner peripheral surface of the end from which the mortar layers 7 and 8 of both the mouth portions 3 and 5 are removed. . This pipe joint movement prevention tool 12 is attached to prevent relative movement of the two-end pipes 2 and 4 in the pipe axis direction when the pipe joint 1 receives an unexpected force when an earthquake or the like occurs.

  This pipe joint movement prevention tool 12 includes a movement prevention body 13 attached over the inner peripheral surface from which the mortar layers 7 and 8 of both the mouth portions 3 and 5 are removed, and the movement prevention body 13 at the both mouth portions 3 and 5. And a cylindrical body 14 that covers the inner peripheral surface of the cylindrical body 14.

  As shown in FIG. 2A and FIG. 2B, the cylindrical body 14 is formed on the entire circumference in the circumferential direction of the arcuate frames 25 and 25 divided into two in the circumferential direction and the arcuate frames 25 and 25. It is comprised by the water stop rubber 15 wound over. Regarding these arc-shaped frames 25, only one configuration will be described for the same configuration, and description of the other configuration will be omitted. In addition, the division structure of the cylindrical body 14 is not necessarily limited to the division structure divided into two in the circumferential direction, and may be, for example, a structure of three or more divisions in the circumferential direction.

  The arc-shaped frame 25 is made of a metal material such as steel that has been subjected to rust prevention treatment in advance, and has an outer diameter that is slightly smaller than the inner diameters of the mouth portions 3 and 5. Further, at both ends of the arc-shaped frame 25 in the tube axis direction, standing pieces 25c and 25c are erected over the entire circumference in the outer diameter direction of the both-end tubes 2 and 4, respectively. Between the standing pieces 25c, 25c is formed in a concave groove 25a that opens in the outer diameter direction of the both-end pipes 2, 4 over the entire circumference of the arc-shaped frame 25. At both end edges in the circumferential direction of the arc-shaped frame 25, screw holes 25b in which female screws (not shown) are formed so as to face the radial direction of the two-end pipes 2 and 4, respectively, are directed 2 toward the pipe axis direction. A cylindrical shape is formed by connecting the connection plate 16 between the screw holes 25b, 25b of the arcuate frames 25, 25 (see FIG. 3B).

  Further, as shown in FIGS. 3A and 6A, the water stop rubber 15 is accommodated in the concave grooves 25a of the circular arc frames 25, 25 formed in a cylindrical shape. At both ends of the water stop rubber 15 on the tube axis direction side, lip portions 15a and 15a projecting in the outer diameter direction of the two-end pipes 2 and 4 are formed over the entire circumference of the water stop rubber 15. A concave groove 15b is formed between the lip portions 15a and 15a and opens in the outer diameter direction of the two-end pipes 2 and 4 over the entire circumference of the water-stopping rubber 15.

  On the other hand, as shown in FIGS. 4 and 5, the movement preventing body 13 includes a plurality of first engaging members 17 fixed to a fixing portion 26 that is a predetermined portion on the inner peripheral surface of the insertion portion 3, and the first engagement member 17. The second engaging member 18 is fixed to a plurality of fixing portions 27 that are predetermined portions of the receiving portion 5 so as to be engageable with the engaging member 17.

  Each first engagement member 17 is formed of a metal material such as steel that has been subjected to rust prevention treatment in the same manner as the arc-shaped frame 25 and is formed in an arc shape extending in the circumferential direction of the insertion portion 3. The fixing portion 26 is fixed to the fixing portion 26 on the inner peripheral surface of the insertion portion 3 from which the mortar layer 7 has been removed via the welding portion 19. The plurality of first engagement members 17 are arranged in contact with the inner peripheral surface of the insertion portion 3 from which the mortar layer 7 has been removed, along the circumferential direction, and between the adjacent first engagement members 17. A gap 20 is formed. The circumferential dimension of these gaps 20 is shorter than the circumferential dimension of each second engagement member 18.

  Furthermore, welding is applied to both ends in the tube axis direction of the plurality of first engaging members 17 in contact with the inner peripheral surface of the insertion portion 3, and these weldings are performed. The portions constitute welded portions 19, 19, and the plurality of first engaging members 17 are fixed to the fixing portion 26 on the inner peripheral surface of the insertion portion 3. As described above, the plurality of first engaging members 17 are welded to the inner peripheral surface of the insertion portion 3, so that both the mouth portions 3, 5 extend along the circumferential direction on the inner peripheral surface of the insertion portion 3. A ridge projecting in the inner diameter direction is formed.

  Next, the plurality of second engaging members 18 are made of a metal material such as steel that has been subjected to rust prevention treatment in advance, as with the first engaging member 17. It is formed in an arc shape extending in the circumferential direction, and is fixed to the inner peripheral surface of the receiving portion 5 from which the mortar layer 8 has been removed via a welded portion 21.

  Specifically, each of the plurality of second engaging members 18 includes a fixing piece 18a facing the radial direction of both the mouth portions 3 and 5, and a pipe from the inner diameter direction end of both the mouth portions 3 and 5 of the fixing piece 18a. An extending piece 18b extending toward the detaching direction of the insertion tube 2 in the axial direction, and outer diameters of both the opening portions 3 and 5 from the insertion tube 2 detaching direction side end in the tube axis direction of the extending piece 18b. And a restriction piece 18c extending in the direction, and is formed in a substantially U-shaped cross-sectional view facing the outer diameter direction of both mouth portions 3 and 5.

  Each of the second engaging members 18 is adjacent to the inner peripheral surface of the receiving portion 5 from which the mortar layer 8 has been removed. A gap 22 is formed between the second engagement members 18. The circumferential dimensions of the gaps 22 are shorter than the circumferential dimensions of the first engaging members 17, and the second engaging members 18 have the gaps 22 in the circumferential direction with respect to the gaps 20. The end portions on the outer diameter side of the fixing pieces 18 a are in contact with the inner peripheral surface of the receiving portion 5 so as to be formed at different positions.

  The space surrounded by the fixed piece 18a, the extended piece 18b, and the restricting piece 18c has a first engagement as the second engagement member 18 is fixed to the inner peripheral surface of the receiving portion 5 as will be described later. A concave groove 18d in which the member 17 is accommodated is formed. The length of the restricting piece 18c extending from the extending piece 18b to the outer diameter direction of both the mouth portions 3 and 5 is from the extending piece 18b of the fixing piece 18a to the outer diameter direction of both the mouth portions 3 and 5. Since it is formed to be shorter than the extended length, the regulating piece 18 c comes into contact with the inner peripheral surface of the insertion portion 3 in a state where the fixed piece 18 a is fixed to the inner peripheral surface of the receiving portion 5. Is preventing.

  An outer diameter side end portion of the fixing piece 18a of the plurality of second engaging members 18 that is in contact with the inner peripheral surface of the receiving portion 5 is inserted by the operator or the like from the insertion tube 2 insertion direction side in the tube axis direction. Welding is performed, and the places where the welding is performed constitute a welded portion 21, and a plurality of second engaging members 18 are fixed to the inner peripheral surface of the receiving port portion 5. As described above, the plurality of second engaging members 18 are welded to the inner peripheral surface of the receiving portion 5, so that both the mouth portions 3, 5 extend along the circumferential direction on the inner peripheral surface of the receiving portion 5. A ridge projecting in the inner diameter direction is formed.

  Next, a method of attaching the pipe joint movement preventing tool 12 configured as described above over both the mouth portions 3 and 5 will be described.

  First, as shown in FIGS. 1 (a) and 1 (b), a plurality of first engaging members 17 are fixed along the fixing portions 26 on the inner peripheral surface of the insertion portion 3 as a movement preventing body installation step. At the same time, the second engaging member 18 is fixed along the fixing portion 27 on the inner peripheral surface of the receiving portion 5. Specifically, first, the mortar layers 7 and 8 at the ends of both the mouth portions 3 and 5 are peeled and removed.

  Then, as shown in FIGS. 3B and 4, after the first engagement member 17 is placed in contact with the gap 20 along the inner peripheral surface of the insertion portion 3, the first engagement is performed. Welded portions 19 and 19 are formed by welding between both ends in the tube axis direction of the member 17 and the fixing portion 26 on the inner peripheral surface of the insertion portion 3, and the first engagement member 17 is connected to the inner portion of the insertion portion 3. Secure to the circumference. Thereafter, a rust preventive paint is applied over the entire inner peripheral surface of the insertion portion 3.

  After the first engaging member 17 is fixed to the fixing portion 26 on the inner peripheral surface of the insertion portion 3, the gap 22 is formed along the fixing portion 27 on the inner peripheral surface of the receiving portion 5. After the outer diameter side end portion of the fixing piece 18a is abutted and disposed while being formed, between the insertion tube 2 insertion direction side end portion of the fixing piece 18a in the tube axis direction and the inner peripheral surface of the receiving portion 5. A weld portion 21 is formed by welding, and the second engagement member 18 is fixed to the inner peripheral surface of the receiving portion 5. At this time, the first engagement member 17 is housed and disposed in a concave groove 18 d formed in the second engagement member 18. Furthermore, a rust preventive paint is applied over the entire inner peripheral surface of the receiving portion 5.

  As shown in FIG. 5, these engagement members 17 and 18 are fixed over the entire inner peripheral surface of both the mouth portions 3 and 5, so that the movement preventing body 13 is placed inside the both mouth portions 3 and 5. It is provided along the circumferential direction on the circumferential surface.

  Next, as a cylindrical body installation step, the movement preventing body 13 is covered with the cylindrical body 14 in a watertight manner toward the inner peripheral surfaces of both the mouth portions 3 and 5. Specifically, as shown in FIGS. 6 (a) and 6 (b), two arcuate frames 25 are provided with a plurality of movement preventing bodies 13 in a state where the water stop rubber 15 is accommodated in the concave groove 25a. Is disposed in both the mouth portions 3 and 5 so as to cover. At this time, the movement preventing body 13 is disposed in a space formed by the pair of lip portions 15a and 15a facing the tube axis direction of the water blocking rubber 15 and the groove 15b.

  Then, both the arc-shaped frames 25, 25 are pressed toward the outer diameter direction of the both-end pipes 2, 4 using a hydraulic jack or the like, and the water stop rubber 15 is directed toward the inner peripheral surfaces of the both-end portions 3, 5. The movement preventing body 13 is covered with water-stopping rubber 15 in a watertight manner. At this time, the two arcuate frames 25 and 25 are connected via the connection plate 16 to form the cylindrical body 14.

  As described above, when the movement preventing body 13 is covered with the water stop rubber 15 in a watertight manner, the lip portions 15a and 15a face the inner peripheral surfaces of both the mouth portions 3 and 5, as shown in FIG. It is pressed and deformed. At this time, the upright piece 25c and the restricting piece 18c on the side of the insertion tube 2 in the tube axis direction of the arc-shaped frame 25 are disposed to face each other, and the insertion tube 2 is removed from the arc-shaped frame 25 in the tube axis direction. The standing piece 25c and the fixing piece 18a are arranged to face each other.

  As described above, the pipe joint movement preventing tool 12 is installed over the both mouth portions 3 and 5, thereby preventing the relative movement in the tube axis direction of the both mouth pipes 2 and 4. Specifically, for example, when a relative movement that separates the two-end pipes 2 and 4 in the pipe axis direction due to an unexpected external force such as an earthquake occurs, the first engagement member 17 is relatively moved in the concave groove 18d in the pipe axis direction. It moves and contacts the regulating piece 18c.

  That is, the pipe joint movement preventing tool 12 of the present embodiment allows the relative movement in the pipe axis direction of the both mouth portions 3 and 5 by the movement length in the concave groove 18d of the first engagement member 17, while When the first engaging member 17 abuts on the regulating piece 18c of the second engaging member 18, the relative movement in the tube axis direction of both the mouth portions 3 and 5 exceeding the movable length in the concave groove 18d is regulated. Thus, the first engaging member 17 and the restricting piece 18c constitute a restricting portion in the present invention.

  Further, since the standing pieces 25c and 25c are arranged close to the inner peripheral surfaces of the both mouth portions 3 and 5, the both mouth portions 3 and 5 are relatively moved in the tube axis direction. Since the fixed piece 18a is engaged with the standing pieces 25c, 25c via the lip portion 15a of the water blocking rubber 15, the cylinders are moved along with the relative movement of both the mouth portions 3, 5 in the tube axis direction. The movement of the rod 14 in the tube axis direction is restricted.

  Further, as shown in FIGS. 5 and 6B, the first engaging member 17 is accommodated and disposed in the concave groove 18d over substantially the entire circumference in the circumferential direction of both the mouth portions 3 and 5. Thus, both the mouth tubes 2 and 4 are rotatable with respect to each other in the circumferential direction. For this reason, the pipe joint movement preventing device 12 in the present embodiment has the first engagement member 17 in the first engagement member 17 even when a force of relative rotation in the circumferential direction is applied to the two-end pipes 2 and 4 due to an unexpected external force such as an earthquake. The two-end pipes 2 and 4 can be relatively rotated in the circumferential direction by relatively moving in the circumferential direction along the concave groove 18d which is the inside of the two engaging member 18.

  As described above, the pipe joint movement preventing device 12 according to the first embodiment is received so as to be engageable with the first engagement member 17 and the first engagement member 17 fixed to the fixing portion 26 on the inner peripheral surface of the insertion port 3. The movement prevention body 13 which consists of the 2nd engaging member 18 fixed to the fixing | fixed part 27 of the internal peripheral surface of the opening | mouth part 5 and is provided along the circumferential direction on the internal peripheral surface of both the mouth parts 3 and 5, A cylindrical body 14 that is disposed at an opposing position facing the inner peripheral surface of the portions 3 and 5 in the circumferential direction, and covers the movement preventing body 13 in a watertight manner toward the inner peripheral surfaces of the mouth portions 3 and 5; Each of the engaging members 17, 18 includes a first engaging member 17 and a restricting piece 18c that restrict relative movement in the tube axis direction with respect to each other to allow for a predetermined length. Even if the insertion tube 2 and the receiving tube 4 try to move relative to each other in the tube axis direction due to the unexpected external force, the both engaging members 1 constituting the movement preventing body 13 are used. , 18 by the first engaging member 17 and the restricting piece 18c, the insertion portion 3 to which the first engaging member 17 is fixed and the receiving portion 5 to which the second engaging member 18 is fixed are connected in the tube axis direction. In addition, it is possible to allow relative movement of a predetermined length, and by covering the movement preventing body 13 that allows relative movement with a separate cylindrical body 14 in a watertight manner, both mouth portions 3 and 5 are relatively moved. In addition, the water-tight coating of the movement preventing body 13 can be maintained.

  In addition, since the engaging members 17 and 18 are fixed by welding, it is not necessary to perform processing for fixing the engaging members 17 and 18 to the insertion portion 3 and the receiving portion 5 in advance. The engaging members 17 and 18 can be fixed easily and reliably.

  Moreover, since each engaging member 17 and 18 comprises the protrusion fixed along the circumferential direction to the inner peripheral surface, both the mouth parts 3 and 5 are relative to the circumferential direction along each protrusion. Can be moved.

In addition, a plurality of protrusions constituting the engaging members 17 and 18 are fixed to the inner peripheral surface along the circumferential direction, and a gap between adjacent protrusions constituting the first engaging member 17 is secured. 20 and the gap 22 between adjacent ridges constituting the second engagement member 18 are formed at different positions in the circumferential direction, so that each of the projections constituting one of the engagement members 17 and 18 is formed. Since the strip crosses the gaps 20 and 22 between the adjacent ridges constituting the other engagement members 18 and 17, the force is dispersed and engaged with the plurality of ridges in the circumferential direction. Even if an external force that is biased to a predetermined location in the circumferential direction is applied to both the mouth portions 3 and 5, there is no possibility that an uneven load is applied only to the ridge located at that location.

  Further, the pipe joint movement preventing method is fixed to the inner peripheral surface of the receiving portion 5 so as to be engageable with the first engaging member 17 and the first engaging member 17 fixed to the inner peripheral surface of the inserting portion 3. The movement preventing body 13 comprising the second engaging member 18 is provided on the inner circumferential surface of the both mouth portions 3 and 5 along the circumferential direction, and the movement preventing body 13 is disposed on the both mouth portions 3 and 5. A cylindrical body installation step in which the cylindrical body 14 that is water-tightly coated toward the inner peripheral surface of the cylindrical body 14 is installed at a facing position facing the inner peripheral surfaces of the mouth portions 3 and 5 in the circumferential direction. Therefore, even if the insertion tube 2 and the receiving tube 4 try to move relative to each other in the tube axis direction due to an unexpected external force such as an earthquake, the first engagement of the two engaging members 17 and 18 constituting the movement preventing body 13 is achieved. The insertion portion 3 to which the first engagement member 17 is fixed and the receiving portion 5 to which the second engagement member 18 is fixed are connected in the tube axis direction by the joint member 17 and the restriction piece 18c. Not only can the relative movement of a predetermined length be allowed, but the process of installing the movement preventing body 13 that allows the relative movement and the process of installing the cylindrical body 14 that covers the movement preventing body 13 in a watertight manner are separately configured. Therefore, the work can be performed easily and reliably.

  Next, a pipe joint movement preventing tool according to Embodiment 2 will be described with reference to FIG. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted. Hereinafter, the left and right sides of FIG. 7 will be described as the pipe axis direction side of the pipe joint movement preventing tool.

  As a second embodiment, when the force to move both the mouth portions 3 and 5 relative to the tube axis direction due to an unexpected external force such as an earthquake is stronger than expected, the restricting piece 28 of the second engagement member 18 ' The plastic deformation or fracture occurs in the axial direction.

  Specifically, as shown in FIG. 7, the restricting piece 28 in the second embodiment is formed thin in the tube axis direction, and both the engaging members 17 and 18 ′ have both the mouth portions 3 and 5. The strength is such that it can be broken with a smaller force than that caused by the force of relative movement in the tube axis direction. For this reason, both the adhering portions 26 and 27 are damaged because the restricting piece 28 is damaged before the both adhering portions 26 and 27 are damaged by the force that relatively moves both the mouth portions 3 and 5 in the tube axis direction. Is prevented. That is, the restricting piece 28 of the second engagement member 18 'constitutes a breakable portion in the present invention.

  In this embodiment, the restricting piece 28 is configured as a breakable portion. However, the first engaging member excluding the fixing portion with the fixing portion 26 is configured as a breakable portion, and both fixing portions 26 and 27 are both mouth portions. The first engaging member may be damaged before it is damaged by the force of moving the pipes 3 and 5 relative to each other in the tube axis direction to prevent both the fixing portions 26 and 27 from being damaged. Furthermore, when the breakable portion is formed on the second engaging member, the fixing piece other than the restricting piece 28 or the fixed portion with the extending piece or the fixing portion 27 may be configured as the breakable portion. .

  As described above, in the pipe joint movement preventing tool 12 according to the second embodiment, at least one of the engaging members 17 and 18 ′ is such that the two-port pipes 2 and 4 move relative to each other so that the fixing portions 26 and 26 of the both-port portions 3 and 5 are fixed. Since the restricting piece 28 that can be broken with a force smaller than the force of the magnitude that breaks the belt 27 is provided, the broken engagement members 17 and 18 ′ can be replaced without damaging both the mouth portions 3 and 5. The pipe joint 1 can be continuously used only by performing work.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the second embodiment, when both engaging members 17 and 18 ′ are made of steel and an external force exceeding the assumption is applied to the both-end pipes 2 and 4, both the welded portions 19 and 21 are connected to the both-end portions 3. , 5 is configured so that the restricting piece 28 is damaged before it is damaged by the force of relative movement in the tube axis direction. However, the second engaging member is made of a metal material having a relatively high stretchability. When an external force exceeding the assumption is applied to the mouth pipes 2 and 4, the second engagement member may be extended by a force that relatively moves both the mouth parts 3 and 5 in the pipe axis direction.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Insertion pipe 3 Insertion part 4 Receptacle pipe 5 Receptacle part 6 Seal member 12 Pipe joint movement prevention tool 13 Movement prevention body 14 Cylindrical body 15 Water stop rubber 17 1st engagement member (regulation part)
18, 18 '2nd engagement member 18c Restriction piece (regulation part)
19 Welded portion 20 Gap 21 Welded portion 22 Gap 25 Arc-shaped frames 26 and 27 Fixed portion (predetermined location on the inner peripheral surface)
28 Restriction piece (breakable part)

Claims (6)

In the pipe joint provided with the insertion portion of the insertion tube, the reception portion of the reception tube into which the insertion portion is inserted, and a seal member that seals between the two opening portions, the both opening portions A pipe joint movement preventing tool that is constructed over the inner peripheral surface of the pipe in the pipe axis direction and prevents relative movement of the two ports in the pipe axis direction,
A first engagement member fixed to a predetermined location on the inner peripheral surface of the insertion port, and a second engagement fixed to a predetermined location on the inner peripheral surface of the receiving port so as to be engageable with the first engagement member. The movement preventing body, which is made of a joint member and is provided along the circumferential direction on the inner circumferential surface of the two mouth portions, and is disposed at a facing position facing the inner circumferential surface of the both mouth portions in the circumferential direction, and the movement A cylindrical body that water-tightly covers the prevention body toward the inner peripheral surface of the both mouths,
Each said engagement member is provided with the control part which controls the relative movement of the pipe axis direction with respect to each other so that predetermined length is permissible, The pipe joint movement prevention tool characterized by the above-mentioned.   The pipe joint movement preventing tool according to claim 1, wherein each of the engaging members is fixed by welding.   Each said engaging member comprises the protrusion fixed to the said internal peripheral surface along the circumferential direction, The pipe joint movement prevention tool of Claim 1 or 2 characterized by the above-mentioned.   A plurality of ridges constituting each engagement member are fixed to the inner peripheral surface along the circumferential direction, and a gap between adjacent ridges constituting the first engagement member; The pipe joint movement preventing device according to any one of claims 1 to 3, wherein a gap between adjacent ridges constituting the second engagement member is formed at different positions in the circumferential direction. .   At least one of the engaging members includes a breakable portion that can be broken with a force that is smaller than a force of a magnitude that breaks the predetermined portion of the both mouth portions due to relative movement of the both mouth tubes. The pipe joint movement preventing device according to any one of claims 1 to 4. In the pipe joint provided with the insertion portion of the insertion tube, the reception portion of the reception tube into which the insertion portion is inserted, and a seal member that seals between the two opening portions, the both opening portions A pipe joint movement prevention method for preventing relative movement in the pipe axis direction of the two ports,
Movement prevention comprising a first engagement member fixed to the inner peripheral surface of the insertion portion and a second engagement member fixed to the inner peripheral surface of the receiving portion so as to be engageable with the first engagement member. A movement preventing body installation step for providing a body along the circumferential direction on the inner peripheral surface of the both mouth parts;
Cylindrical body installation which installs the cylindrical body which coats the movement prevention body watertight toward the inner peripheral surface of the two mouth portions at a facing position facing the inner peripheral surface of the two mouth portions in the circumferential direction. A pipe joint movement preventing method comprising: a step;

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