JP5069995B2 - Pipe joint movement prevention device and pipe joint movement prevention method - Google Patents

Description

The present invention relates to a movement prevention device and a movement prevention method for preventing relative movement of a receiving port and an insertion port inserted and connected to the receiving port in the tube axis direction, and in particular, for restricting the expansion and contraction function of a seismic pipe joint. It is useful as a movement prevention device.

  Conventionally, as shown in FIG. 3, the lock ring 4 is stored in the storage groove 1 d formed on the inner periphery of the receiving port 1, and the protrusion 2 a formed on the outer periphery of the insertion port 2 can be engaged with the lock ring 4. Seismic pipe joints are known. In this type of pipe joint, the receiving port 1 and the insertion port 2 are configured to be relatively movable in the tube axis direction, and the expansion and contraction of the pipe line is allowed within a certain range. The expansion / contraction allowance in this pipe joint corresponds to the distance d1 from the projection 2a to the lock ring 4 and the distance d2 from the tip 2b of the insertion port 2 to the back end 1c of the receiving port 1, and the pipe joint due to an earthquake or the like. When a force is applied in the direction of pulling out, the protrusion 2a can be prevented from coming off by engaging the lock ring 4.

  By the way, if a seismic resistant pipe joint having an expansion / contraction function as described above is used in a range where a so-called non-average force acts (curved pipe portion, T-shaped portion, pipe end portion, etc.), the pipe line is in the direction of the non-average force acting. There is a risk of stretching and bending. Therefore, when using a seismic pipe joint in the range where the non-average force acts, it is necessary to restrict its expansion / contraction function. Conventionally, as shown in FIG. A liner 8 is set between the rear end 1c and the protrusion 2a is fixed to the lock ring 4 (see Patent Documents 1 and 2 below). Reference numeral 9 denotes a centering member for the liner 8.

  However, since such a liner cannot be visually recognized in a state in which the pipe joint is connected, there is a problem that even if the operator forgets to set, the liner cannot be immediately noticed. In addition, since the operation of releasing the connection of the earthquake-resistant pipe joint is very complicated, it is difficult to retrofit the liner, and it has not been possible to flexibly cope with a change in the design of the pipeline. For this reason, there has been a strong demand for a method that can determine from the appearance the state in which the relative movement between the receiving port and the insertion port is prevented, and that can flexibly cope with changes in the design of the pipeline.

In Patent Document 3 below, one end of a housing that is externally fitted to a pipe joint is locked to the outer peripheral surface of the insertion slot, and when a force acts in the direction of pulling out the pipe joint, it is pulled out by a predetermined expansion allowance. Is described, and the other end of the housing is engaged with the stepped portion of the receiving port. However, the said structure gives an expansion / contraction function to the pipe joint of the existing pipeline, and does not restrict the expansion / contraction function of the pipe joint as described above.
JP 2004-162854 A JP 2003-202092 A Japanese Patent No. 3359510

The present invention has been made in view of the above circumstances, and its purpose is to determine the state of preventing relative movement between the receiving port and the insertion port from the appearance, and to flexibly cope with changes in the design of the pipeline. An object of the present invention is to provide a pipe joint movement prevention device and a pipe joint movement prevention method .

The above object can be achieved by the present invention as described below. That is, the apparatus for preventing movement of a pipe joint according to the present invention provides a movement prevention apparatus for a pipe joint for preventing relative movement in the tube axis direction between a receiving port and an insertion port inserted and connected thereto. A cylindrical insertion-side member that is externally fitted to the outer peripheral surface, and a cylindrical reception-side member that is externally fitted over the outer peripheral surface of the insertion port from the outer peripheral surface of the reception port, A locking portion that can bite into the outer peripheral surface of the insertion opening from the tube diameter direction, and a first hook-shaped portion that extends from the locking portion toward the receiving side. An engagement portion that can be engaged with the outer peripheral surface of the mouth in the tube axis direction, and is bent so as to extend from the engagement portion toward the insertion opening and to be in contact with the end face of the receiving opening; A second hook-like part configured to be engageable with the pipe-like part in the direction of extracting the pipe joint, and the second hook-like part is located in front of the end surface of the receiving port and is an outer peripheral surface of the insertion port. Away from The first hook-shaped portion is disposed on the outer peripheral side of the second hook-shaped portion, and has a portion that extends in the axial direction and the tip bends inward and outward in the tube diameter direction. Engage with a portion bent outward in the tube diameter direction, so that the engaging portion is bitten into the outer peripheral surface of the insertion opening, and the first hook-like portion and the second hook-like portion are engaged with each other Thus, the end surface of the receiving port and the insertion side member are configured to come into contact with each other from the tube axis direction with the second hook-shaped portion interposed therebetween .

  In the pipe joint movement preventing device according to the present invention, the insertion side member and the receiving side member are fitted on the pipe joint, and the first hook-like part and the second hook-like part are engaged with each other. Then, while engaging the engaging part of the insertion port side member with the outer peripheral surface of the insertion port and engaging the engaging part of the reception port side member with the outer peripheral surface of the reception port, Relative movement in the tube axis direction can be prevented. Therefore, when this is applied to the earthquake-resistant pipe joint, the expansion / contraction function can be regulated as a substitute for the liner. In addition, it can be retrofitted because it is externally fitted to the pipe joint, and it can be distinguished from the appearance that the relative movement between the receiving port and the insertion port is prevented, and it can flexibly respond to changes in the design of the pipeline. it can.

  In the present invention, since the second hook-shaped portion of the receiving-side member extends from the engaging portion to the insertion opening side and bends so as to face the end surface of the receiving port, the first hook-shaped portion is located in front of the end surface of the receiving port. Can be engaged with the part. As a result, the outer diameter of the device does not become larger than necessary, and the device can be configured compactly, so that it is light and inexpensive and easy to handle. Also, since the device is divided into a receiving side member and an insertion side member, if the shape of the receiving port is different due to the difference in tube type, it is only necessary to change the receiving side member. Can be used in common with various tube types.

As described above, in the apparatus for preventing movement of a pipe joint according to the present invention, the engaging portion is caused to bite into the outer peripheral surface of the insertion opening, and the first hook-like portion and the second hook-like portion are engaged with each other. In this state, the end face of the receiving port and the insertion side member are configured to contact each other from the tube axis direction with the second hook-shaped portion interposed therebetween . According to such a configuration, since a movement allowance in the tube axis direction is not formed, relative movement between the receiving port and the insertion port can be more reliably prevented.

  In the present invention, even if the first hook-shaped portion is disposed on the outer peripheral side of the second hook-shaped portion in a state where the first hook-shaped portion and the second hook-shaped portion are engaged with each other. However, the second hook-shaped part may be arranged on the outer peripheral side of the first hook-shaped part.

  In the above, the locking portion holds the retaining member having a biting claw formed on the inner periphery, and when the force acts in the pulling direction of the pipe joint, the retaining member is What is comprised so that it may be pressed by an outer peripheral surface is preferable, and, thereby, the relative movement of a receiving port and an insertion port can be prevented more reliably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view showing an example of a pipe joint movement preventing device according to the present invention. FIG. 2 is a view of the movement preventing device as viewed from the tube axis direction, and the upper half of FIG. 1 corresponds to a cross section taken along the line AA in FIG.

  In this pipe joint movement preventing device 10, the receiving port 1 of one pipe P1 and the insertion port 2 of the other pipe P2 inserted and connected thereto are relatively moved in the pipe axis direction (left-right direction in FIG. 1). This is to prevent this from happening. The pipes P1 and P2 are fluid pipes for transporting water, gas, and the like, and are made of, for example, cast iron or ductile cast iron. The pipe P <b> 1 is a non-flange type pipe in which no flange is formed in the receiving port 1, and a step portion 1 b is formed in the vicinity of the end surface 1 a of the receiving port 1. The outer peripheral surface of the receiving port 1 has a gradually tapered shape with the diameter dimension gradually increased toward the end surface 1a.

  The sealing material 3 is an annular member that seals between the inner peripheral surface of the receiving port 1 and the outer peripheral surface of the insertion port 2, and is made of synthetic rubber such as styrene butadiene rubber, for example. This pipe joint is a so-called slip-on type pipe joint, and the sealing material 3 is fitted into the fitting groove 1e formed on the inner periphery of the receiving port 1, and the insertion port 2 is inserted into the receiving port 1 in this state. By doing so, the sealing material 3 is compressed and a required sealing state is obtained.

  This pipe joint is a kind of earthquake-resistant pipe joint having an expansion / contraction function and a detachment prevention function, and a lock ring 4 is housed in a housing groove 1 d formed on the inner periphery of the receiving port 1 and formed on the outer periphery of the insertion port 2. The projected portion 2 a is configured to be engageable with the lock ring 4. Further, expansion and contraction in the tube axis direction is allowed within a certain range, and corresponds to the distance from the protrusion 2a to the lock ring 4 and the distance from the tip 2b of the insertion port 2 to the back end 1c of the receiving port 1. An expansion / contraction allowance is provided (see FIG. 3). Reference numeral 5 denotes a centering rubber for the lock ring 4.

  The movement prevention device 10 includes a cylindrical insertion-side member 16 that is externally fitted to the outer peripheral surface of the insertion port 2, and a cylindrical reception port that is externally fitted from the outer peripheral surface of the reception port 1 to the outer peripheral surface of the insertion port 2. Side member 15. The insertion side member 16 has a split structure as shown in FIG. 2, and the divided portion is connected and fixed by a fastener 29. Similarly, the receiving side member 15 also has a split structure, and the divided portion is connected and fixed by a fastener 28.

  The insertion-side member 16 includes a locking portion 12 that can bite into the outer peripheral surface of the insertion port 2 from the tube diameter direction, and a first hook-shaped portion 19 that extends from the locking portion 12 to the receiving port 1 side. Have. The receiving-side member 15 includes an engaging portion 11 that can be engaged with the stepped portion 1 b of the receiving port 1 in the tube axis direction, and an end surface of the receiving port 1 that extends from the engaging portion 11 to the insertion opening 2 side. It has a second hook-like portion 18 that is bent so as to face 1a and that can be engaged with the first hook-like portion 19 in the extraction direction of the pipe joint.

  The locking portion 12 is formed with an inner circumferential groove 12a extending continuously or intermittently in the circumferential direction, and a retaining member 13 is accommodated and held in the inner circumferential groove 12a. A pair of biting claws 13a are formed on the inner circumference of the retaining member 13 at intervals in the tube axis direction. Can be included. A number of biting claws 13 a may be formed on the inner peripheral surface of the retaining member 13.

  In the present embodiment, the ceiling surface of the inner circumferential groove 12 a is increased in diameter toward the receiving port 1, and the outer peripheral surface of the retaining member 13 is inclined so as to increase in diameter toward the receiving port 1. As a result, when a force acts in the pulling direction of the pipe joint, a wedge effect is produced, and the retaining member 13 is strongly pressed against the outer peripheral surface of the insertion port 2, and the locking action at the locking portion 12 is enhanced. .

  The first hook-shaped portion 19 extends from the upper portion of the locking portion 12 in the tube axis direction, and its tip is bent inward in the tube radial direction. The inner diameter of the tip end of the first hook-shaped portion 19 is designed to be smaller than the outer diameter of the end surface 1 a of the receiving port 1 in a state where the engaging portion 12 is bitten into the outer peripheral surface of the insertion port 2. . In the present embodiment, the first hook-shaped portions 19 are provided at four locations in the circumferential direction, but this number can be appropriately changed and may be provided in an annular shape.

  The engaging portion 11 is disposed on the outer peripheral side of the receiving port 1, and its inner diameter is designed to be smaller than the outer diameter of the stepped portion 1 b of the receiving port 1. In addition, a biting claw is formed on the inner periphery of the engaging portion 11, and the biting claw is bitten into the outer peripheral surface of the receiving port 1 from the pipe diameter direction while engaging the engaging portion 11 with the stepped portion 1 b. You may do it. In such a case, it is possible to compensate for the lowering of the engaging action due to the poor tightening of the fastener 28 or the small height H (see FIG. 3) of the stepped portion 1b, thereby preventing the receiving-side member 15 from being separated from the receiving port 1. be able to.

  The second hook-shaped portion 18 is provided in a substantially annular shape from the outer peripheral surface of the receiving port 1 to the outer peripheral surface of the insertion port 2. The second hook-shaped portion 18 includes a portion extending from the engaging portion 11 toward the insertion port 2 so as to cover the stepped portion 1b, a portion extending in the tube diameter direction and facing the end surface 1a of the receiving port 1, and the receiving port 1 The front end surface 1a extends in the tube axis direction, the tip is bent inward and outward in the tube radial direction, and is configured by a first hook-shaped portion 19 and a portion that engages in the pipe joint extraction direction.

  The movement preventing device 10 is externally fitted to the pipe joint and attached, and the locking portion 12 is bitten on the outer peripheral surface of the insertion slot 2 in a state where the first hook-shaped portion 19 and the second hook-shaped portion 18 are engaged. In addition, by engaging the engaging portion 11 with the step portion 1b of the receiving port 1, relative movement of the receiving port 1 and the insertion port 2 in the tube axis direction can be prevented. Therefore, if it is applied to a seismic pipe joint that is constructed on a curved pipe portion of a pipeline, the expansion / contraction function can be restricted without using a liner, and expansion / contraction due to an unbalanced force during water flow can be prevented.

  In this pipe joint, as shown in FIG. 1, the locking portion 12 is bitten into the outer peripheral surface of the insertion opening 2 and the first hook-like portion 19 and the second hook-like portion 18 are engaged with each other. Thus, the end surface 1a of the receiving port 1 and the insertion side member 16 are in contact with each other from the tube axis direction with the second hook-shaped portion 18 interposed therebetween. Therefore, the movement allowance in the tube axis direction in the movement preventing device 10 is not formed, and the relative movement between the receiving port 1 and the insertion port 2 can be more reliably prevented. In FIG. 1, a small gap is provided between the first hook-shaped portion 19 and the second hook-shaped portion 18, but this is a play for simplifying the mounting work, There is no effect.

  As described above, in the present embodiment, when a force is applied in the pulling-out direction of the pipe joint, a wedge effect is generated, and the retaining member 13 is strongly pressed against the outer peripheral surface of the insertion slot 2 so that the locking action is achieved. Enhanced. For this reason, in combination with the structure in which the movement allowance is not formed, the relative movement between the receiving port 1 and the insertion port 2 can be more effectively prevented.

  According to the present invention, it is obvious whether or not the movement preventing device 10 is attached to the pipe joint, and the state in which the relative movement between the receiving port 1 and the insertion port 2 is prevented is easily determined from the appearance. be able to. Moreover, the movement prevention apparatus 10 can be easily attached or detached after the pipe joint is connected, and can flexibly cope with a design change of the pipe line.

  The movement prevention device 10 only needs to prevent relative movement between the receiving port 1 and the insertion port 2 to the extent that the above-described expansion and contraction due to the non-average force is prevented, and a huge force in the tube axis direction acts due to an earthquake or the like. In such a case, the movement preventing effect may not be exhibited. In a situation where an earthquake has occurred and the locking action at the locking part 12 and the engaging action at the engaging part 11 are no longer effective, the protrusion 2a of the insertion slot 2 is engaged with the lock ring 4, Or since the front-end | tip 2b of the insertion port 2 contact | abuts the back end 1c of the receiving port 1, the displacement beyond it does not occur.

[Another embodiment]
(1) The present invention is not limited to the embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention. Three insertion side members and three reception side members are provided. A split structure or a quadrant structure may be used. Moreover, it is not restricted to what connects and fixes a division part with the fastener of a volt | bolt and a nut, For example, it is also possible to make one of the division parts into a hinge structure when it is set as a split structure.

  (2) In the above-described embodiment, the example in which the engaging portion engages with the stepped portion formed on the outer peripheral surface of the receiving port is shown, but the present invention is not limited to this. For example, even when a step portion is not formed on the outer peripheral surface of the receiving port, the outer peripheral surface of the receiving port is formed in a tapered shape that increases in diameter toward the tip, and the inner diameter of the engaging portion is By making it smaller than the outer diameter, the engaging portion can be engaged with the outer peripheral surface of the receiving port in the tube axis direction.

(3) The structure of the locking portion is not limited to that shown in the above-described embodiment, and for example, the outer peripheral surface of the retaining member may be formed as a curved surface so as to be inclined on both sides in the tube axis direction. Alternatively, the claw may be directly projected into the locking portion without using the retaining member. Also, as in the previous embodiment, the first hook-like portion so as to cover the second barb, the first barb is engaged with each other is disposed on the outer peripheral side of the second barb.

The fragmentary sectional view which shows an example of the movement prevention apparatus of the pipe joint which concerns on this invention The figure which looked at the movement prevention apparatus of FIG. 1 from the pipe-axis direction Sectional view showing an example of earthquake-resistant pipe joint Sectional view when a liner is attached to the earthquake-resistant pipe joint shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Receptacle 1a End surface 1b Step part 2 Insert 3 Seal material 4 Lock ring 10 Movement prevention apparatus 11 Engagement part 12 Locking part 13 Retaining member 13a Biting claw 15 Receptacle side member 16 Insertion side member 18 2nd The bowl-shaped part 19 The first bowl-shaped part P1, P2 pipe

Claims (3)

In the pipe joint movement preventing device for preventing relative movement in the tube axis direction between the receiving port and the insertion port inserted and connected thereto,
A cylindrical insertion-side member that is externally fitted to the outer peripheral surface of the insertion opening, and a cylindrical reception-side member that is externally fitted over the outer peripheral surface of the insertion opening from the outer peripheral surface of the reception opening,
The insertion port side member has a locking portion that can bite into the outer peripheral surface of the insertion port from the radial direction, and a first hook-shaped portion that extends from the locking portion to the receiving port side,
The receiving-side member is engaged with the outer peripheral surface of the receiving port in the tube axis direction, and extends from the engaging portion to the insertion port side so as to be opposed to the end surface of the receiving port. And a second hook-shaped portion configured to be engageable with the first hook-shaped portion in the extraction direction of the pipe joint ,
The second hook-like portion has a portion that extends in the tube axis direction away from the outer peripheral surface of the insertion port in front of the end surface of the receiving port, and the tip bends inward and outward in the tube radial direction;
The first hook-shaped portion is disposed on the outer peripheral side of the second hook-shaped portion, and engages with a portion bent outward in the radial direction of the tip of the second hook-shaped portion;
In a state where the engaging portion is bitten into the outer peripheral surface of the insertion opening and the first hook-like portion and the second hook-like portion are engaged with each other, the end surface of the receiving opening and the insertion-side member A structure for preventing movement of a pipe joint, wherein the apparatus is configured to come into contact with the second hook-shaped part from the pipe axis direction . The locking portion holds a retaining member having a biting claw formed on the inner periphery, and when the force acts in the pipe joint extraction direction, the retaining member is placed on the outer peripheral surface of the insertion port. The apparatus for preventing movement of a pipe joint according to claim 1, wherein the apparatus is configured to be pressed. In the movement prevention method of the pipe joint for preventing relative movement in the pipe axis direction between the receiving opening and the insertion opening inserted and connected thereto,
It has a latching portion that can bite into the outer peripheral surface of the insertion opening from the tube diameter direction, and a first hook-shaped portion that extends from the locking portion toward the receiving port, and is fitted on the outer circumferential surface of the insertion opening. Attaching the tubular insertion side member to the pipe joint;
An engaging portion engageable with the outer peripheral surface of the receiving port in the tube axis direction, and is bent so as to extend from the engaging portion toward the insertion port and to be in contact with the end surface of the receiving port; A cylindrical receiver that is fitted over the outer peripheral surface of the insertion port from the outer peripheral surface of the insertion port. Attaching the mouth side member to the pipe joint,
The second hook-shaped portion has a portion that extends in the tube axis direction in front of the end surface of the receiving port and away from the outer peripheral surface of the insertion port, and has a tip that bends inward and outward in the tube radial direction. Engaging the first hook-like portion disposed on the outer peripheral side of the portion with the portion bent outward in the radial direction of the tip of the second hook-like portion;
In a state where the engaging portion is bitten into the outer peripheral surface of the insertion opening and the first hook-like portion and the second hook-like portion are engaged with each other, the end surface of the receiving opening and the insertion-side member A structure for preventing the movement of the pipe joint, wherein the second abutment portion is in contact with the second hook-like portion from the pipe axis direction.

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