JP2018071762A - Method and apparatus for preventing disconnection of pipe joint, and socket fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be applied to a pipe joint in which a socket having a step portion on the outer periphery of a pipe end portion is used, the total length of the device can be compactly configured, and a member mounted on the outer periphery of the socket can be lifted. Provided are a method and a device for preventing a pipe joint from coming off, and a socket fitting used for the method and a device. SOLUTION: An annular receiving metal fitting 4 is put on a step portion 11 of a receiving port 1 and mounted, and an inner peripheral surface of the receiving metal fitting 4 is engaged with the step portion 11 in the pipe axial direction. An annular retaining metal fitting 5 is attached to the outer periphery of the insertion port 2, the claw member 6 included in the retaining metal fitting 5 is locked to the outer peripheral surface of the insertion port 2, and the hook 51 formed on the retaining metal fitting 5 is attached to the socket metal fitting 4. It engages in the pipe axis direction from the outer peripheral side. A load receiving surface 40 that receives a load from the hook 51 when an external force for detaching the insertion port 2 from the receiving port 1 is applied is provided at a position farther from the step portion 11 in the insertion opening insertion direction W. [Selection diagram] Fig. 3

Description

  The present invention relates to a detachment prevention method and apparatus for preventing an insertion port from being detached from a receptacle of a pipe joint, and a receptacle fitting used therefor.

  Patent Document 1 describes a reinforcing metal fitting for preventing a pipe joint such as a water pipe buried in the soil from slipping out between receiving openings. In the reinforcing metal fitting described in FIG. 3 of the document, a member attached to the outer periphery of the insertion port is engaged with a hook (engagement portion) that engages with the flange of the receiving port, and a claw that engages with the outer peripheral surface of the insertion port. A member (a retaining member) is provided. According to this reinforcing bracket, the load when the external force that detaches the insertion slot from the receptacle (hereinafter sometimes referred to as “detachment force”) is applied is received by the flange of the receptacle, and the separation prevention function is exhibited. The

  On the other hand, the reinforcing metal fitting described in FIG. 10 of the document is configured to engage the hook with the step portion, not the flange of the receiving port. T-type, NS-type, GX-type and the like are standardized as pipe joints using a receiving port having a step portion on the outer periphery of the pipe end. In general, the height difference (outer diameter difference) of the stepped portion is small, and a step may be formed through a taper. Therefore, the hook engagement with the stepped portion is unstable compared with the case of engaging the flange. It is. In addition, the joint portion may be bent relatively, and in particular, in a large-diameter pipe joint to which a strong detachment force can act, there is a possibility that the engagement may be unexpectedly disengaged.

  Patent Document 2 describes a movement preventing device that is attached to a pipe joint formed by inserting and connecting an insertion port to a receiving port having a stepped portion on the outer periphery of the tube end. This device includes a receiving-side member that is mounted on the outer periphery of the receiving port and an insertion-side member that is mounted on the outer periphery of the inserting port. The receiving-side member has a portion (second hook-shaped portion) that is fitted over the outer periphery of the receiving port from the outer periphery of the receiving port and is bent so as to face the receiving end surface. The insertion side member engages with a bent portion (second hook-shaped portion) of the reception side member.

  In the above movement prevention device, the insertion side member can be stably engaged with the reception side member. However, since a space for engaging them is provided on the front side of the receiving end face, it is necessary to dispose the insertion side member at an appropriate distance from the receiving end, which tends to increase the overall length of the device. It was. As a result, for example, when the insertion port is attached to a pipe joint that is a curved pipe, the insertion side member (the claw member) interferes with the curved portion of the curved pipe, thereby locking the outer peripheral surface of the insertion port. May cause inconveniences such as lowering.

  Patent Document 3 discloses a pipe joint detachment prevention mechanism, but it is a proposal for a pipe receiving structure formed of a resin such as vinyl chloride. It does not relate to the pipe joint used. Further, in this mechanism, since a load receiving surface that receives a load from a member (ring accommodating portion) mounted on the outer periphery of the insertion opening when a detachment force acts is provided in the vicinity of the receiving end surface, When the detachment force is applied, there is a risk that a member (connecting member) mounted on the outer periphery of the receiving port will float.

JP 2010-261480 A JP 2009-85376 A JP 2000-310369 A

  The present invention has been made in view of the above circumstances, and the object thereof is to be applied to a pipe joint in which a receiving port having a step portion on the outer periphery of the pipe end portion is used, and to make the entire length of the apparatus compact. Another object of the present invention is to provide a pipe joint detachment preventing method and apparatus capable of suppressing lifting of a member attached to the outer periphery of the receptacle, and a receptacle fitting used therefor.

  The pipe joint detachment prevention method according to the present invention is a pipe joint detachment prevention method in which an insertion port is inserted and connected to a receptacle having a step portion on the outer periphery of a pipe end portion. A first step of engaging the inner peripheral surface of the receptacle fitting with the stepped portion in the tube axis direction, and attaching an annular retaining fitting to the outer periphery of the insertion slot, A second step of engaging a claw member included in the metal fitting with the outer peripheral surface of the insertion opening and engaging a hook formed on the retaining metal fitting with respect to the receiving metal fitting from the outer peripheral side in the tube axis direction; A load receiving surface that receives a load from the hook when an external force that causes the insertion port to be detached from the receiving port is applied, and is provided at a position farther in the insertion port insertion direction than the stepped portion. To do.

  According to this method, detachment of the insertion fitting from the receptacle is regulated by the fitting fitting and the retaining fitting attached as described above, and the fitting with the receptacle having a stepped portion on the outer periphery of the pipe end is detached. The prevention function can be enhanced. In addition, by providing a load receiving surface that receives the load from the hook formed on the retaining bracket at a position farther in the insertion insertion direction than the stepped portion, the overall length of the device can be made compact, and the outer periphery of the receiving port It is possible to suppress the lifting of the receiving fitting attached to the. Here, the insertion opening insertion direction refers to the direction in which the insertion opening is inserted into the receiving opening.

  The receptacle fitting has a large diameter portion having a relatively large inner diameter and a small diameter portion having a relatively small inner diameter. In the first step, the large diameter portion is placed on the outer periphery of the stepped portion. It is preferable to arrange and engage the stepped portion with a region continuous in the pipe circumferential direction of the small diameter portion. Thereby, the inner peripheral surface of a receptacle metal fitting can be easily engaged with the step part of a receptacle. Further, local stress concentration associated with the action of the detachment force can be suppressed, and shear failure of the socket fitting can be prevented.

  It is preferable to adjust the position of the socket fitting mounted on the step by adjusting the protruding amount of the position adjusting member protruding from the inner peripheral surface of the socket fitting. Thereby, if necessary, the receiving metal fitting can be easily centered (centering work), and the receiving metal fitting can be more stably engaged with the stepped portion.

  In the first step, a boss portion formed on one of the split surfaces of the receptacle fitting having a split structure is directed upward, and in the second step, the hook covers the receptacle fitting. Thus, it is preferable that the retaining bracket is attached from above and the boss portion is disposed in the gap of the hook. When the receiving fitting and the retaining fitting are heavy, it is preferable to suspend each temporarily assembled fitting with a crane or the like and lower it to attach from above. However, when the retaining bracket is mounted from above so that the hook covers the receptacle fitting, if the boss portion of the receptacle fitting attached to the receptacle interferes with the hook, workability may be deteriorated. On the other hand, according to the above method, it is possible to easily perform the mounting operation of the retaining metal fitting without causing the boss portion of the receiving metal fitting to interfere with the hook.

  A pipe joint detachment preventing device according to the present invention is a pipe joint detachment preventing apparatus in which an insertion port is inserted and connected to a receiving port having a stepped portion on the outer periphery of a pipe end portion, and is mounted on the stepped portion. An annular receptacle fitting and an annular retaining fitting attached to the outer periphery of the insertion slot, and the receptacle fitting has an inner peripheral surface that engages with the step portion in the tube axis direction. The retaining bracket includes a claw member that engages with the outer peripheral surface of the insertion opening, and a hook that engages with the receiving fitting from the outer peripheral side in the tube axis direction. A load receiving surface that receives a load from the hook when an external force for detaching the insertion opening is provided at a position farther in the insertion insertion direction than the stepped portion. .

  According to this apparatus, the above-described receiving fitting and retaining fitting regulate the detachment of the insertion opening from the receiving opening, and the pipe joint using the receiving opening having the stepped portion on the outer periphery of the pipe end is prevented. Can be increased. In addition, the load receiving surface that receives the load from the hook of the retaining bracket is provided at a position farther away from the step portion in the insertion direction, so that the overall length of the device can be made compact, and the outer periphery of the receiving port It is possible to suppress the lifting of the receiving fitting attached to the.

  The receptacle metal fitting has a relatively large inner diameter, a large diameter portion disposed on the outer periphery of the stepped portion, and a relatively small inner diameter, and the step in a region continuous in the pipe circumferential direction. It is preferable to have a small diameter part engaged with the part. Thereby, the inner peripheral surface of a receptacle metal fitting can be easily engaged with the step part of a receptacle. Further, local stress concentration associated with the action of the detachment force can be suppressed, and shear failure of the socket fitting can be prevented.

  It is preferable that the thickness of the small diameter portion is larger than the thickness of the large diameter portion. Thereby, the intensity | strength of the small diameter part engaged with a step part can be improved, aiming at the weight reduction of a receptacle metal fitting by making thickness of a large diameter part relatively small.

  It is preferable that the receptacle metal fitting is provided with a position adjusting member configured to project from the inner peripheral surface of the receptacle metal fitting and adjust the projection amount. Thereby, if necessary, the receiving metal fitting can be easily centered (centering work), and the receiving metal fitting can be more stably engaged with the stepped portion.

  It is preferable that the receptacle fitting attached to the stepped portion is configured not to have a portion facing the receptacle end surface from the tube axis direction. Thereby, the position of the receptacle fitting in the tube axis direction can be finely adjusted in accordance with the variation in the outer diameter of the receptacle and the shape of the stepped portion. As a result, it is possible to prevent the inconvenience such that the socket fitting attached to the stepped portion is appropriately fixed and the split surface of the socket fitting is opened by the action of the detachment force.

  The socket fitting according to the present invention is a socket fitting mounted on the step portion with respect to the receptacle having a step portion on the outer periphery of the pipe end portion, and has a relatively large inner diameter, A large-diameter portion disposed on the outer peripheral side of the stepped portion, a small-diameter portion having a relatively small inner diameter and engaged in the tube axial direction with respect to the stepped portion in a region continuous in the tube circumferential direction; And a position adjusting member that protrudes from the inner peripheral surface of the socket fitting and is capable of adjusting the protruding amount. According to this structure, it is suitably used in the above-described method and apparatus for preventing the pipe joint from being detached.

The side view which shows an example of the separation prevention apparatus of the pipe joint which concerns on this invention The perspective view of the separation prevention device Cross-sectional view of the main part of the separation prevention device (A) plan view, (b) front view, (c) cross-sectional view taken along arrow cc, and (d) cross-sectional view taken along line dd Side view of the socket fitting attached to the step of the socket Perspective view of the socket fitting attached to the step of the socket. Schematic diagram showing how the temporarily assembled receptacle fitting is hung up Schematic showing how the temporarily assembled retaining bracket is hung up

  Embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show an example of a pipe joint detachment preventing apparatus according to the present invention. The detachment prevention device 10 is attached to the pipe joints of the fluid pipes P1 and P2 connected to each other, and is configured to prevent the detachment thereof. A receiving port 1 is formed at the tube end of the fluid tube P1, and an insertion port 2 is formed at the tube end of the fluid tube P2. In the present embodiment, an example in which the fluid pipes P1 and P2 are water pipes is shown, but other pipes such as gas pipes and plant pipes may be used. The fluid pipes P1 and P2 are made of ductile cast iron, but are not limited thereto.

  This pipe joint is a push-on type pipe joint in which an insertion slot 2 is inserted and connected to a receptacle 1 having a step 11 on the outer periphery of a pipe end, and the receptacle 1 has a self-sealing function. Many of the pipe joints used for the ductile cast iron pipe are standardized, and T-type, NS-type, GX-type, etc. are standardized as pipe joints using the receiving port having such a stepped portion. Normally, in a mechanical type pipe joint, a receptacle having a flange is used on the outer periphery of the pipe end portion, whereas in a push-on type pipe joint, a receptacle having such a step portion is used.

  The step portion 11 is formed from the outer peripheral edge of the receiving end surface 12 toward the insertion opening insertion direction W (left direction in FIGS. 1 and 3), and the outer diameter of the receiving port 1 is the largest in the step portion 11. The outer diameter of the step portion 11 is constant along the tube axis direction, but may vary slightly. The outer diameters of the receiving tube portions 13 and 14 provided continuously to the step portion 11 are smaller than the outer diameter of the step portion 11. The receiving tube body portion 14 has its outer diameter gradually reduced toward the insertion opening insertion direction W. Although there is a step between the step portion 11 and the receiving tube portion 13, the height difference (outer diameter difference) is small, and in this embodiment, the step is formed via a taper.

  As shown in FIG. 3, the space between the receiving port 1 and the insertion port 2 is sealed with an annular sealing material 3. The sealing material 3 is accommodated on the inner peripheral side of the receiving tube portion 13. Although this pipe joint itself does not have a detachment preventing function, the detachment preventing function can be exhibited by attaching the detachment preventing device 10. The pipe joint to which the detachment prevention device 10 is attached may be a pipe joint having a detachment prevention function as such, and in that case, the detachment prevention function of the pipe joint is further enhanced by attaching the detachment prevention device 10. be able to.

  The detachment prevention device 10 includes an annular receiving metal fitting 4 attached to the stepped portion 11 and an annular retaining metal fitting 5 attached to the outer periphery of the insertion opening 2. The receiving metal fitting 4 has an inner peripheral surface that engages with the step portion 11 in the tube axis direction. The retaining metal fitting 5 includes a claw member 6 that engages with the outer peripheral surface of the insertion opening 2, and the receiving metal fitting 4. And a hook 51 that engages in the tube axis direction from the outer peripheral side. Further, the load receiving surface 40 that receives a load from the hook 51 when a detachment force (an external force that detaches the insertion port 2 from the reception port 1) is applied is located at a position farther away from the step portion 11 in the insertion port insertion direction W. Is provided.

  According to this, the detachment of the fitting 2 in which the detachment of the insertion port 2 from the receptacle 1 is regulated by the receptacle fitting 4 and the retaining fitting 5 and the receptacle 1 having the step portion 11 on the outer periphery of the pipe end portion is used. The prevention function can be enhanced. In addition, the load receiving surface 40 that receives the load from the hook 51 when the detachment force is applied is provided at a position farther away from the step portion 11 in the insertion opening insertion direction W, thereby reducing the overall length of the apparatus 10. In addition, it is possible to suppress the lifting of the receptacle metal fitting 4 attached to the outer periphery of the receptacle 1.

  Since the receiving fitting 4 has a split structure in which divided surfaces are provided at a plurality of locations in the pipe circumferential direction, the receiving fitting 4 can be fitted on the receiving fitting 1 of an existing pipe joint. In the present embodiment, the receiving fitting 4 has a split structure, and is constituted by a pair of divided pieces 4A and 4B. FIG. 4 shows only the divided piece 4A, but the shape of the divided piece 4B is the same as this. As shown in FIGS. 5 and 6, in a state where the receiving fitting 4 is mounted, the divided surfaces are fastened by the fasteners 43 composed of bolts and nuts, and the divided pieces 4 </ b> A and 4 </ b> B connected to each other are connected in an annular shape. . The fastener 43 is attached to a bolt hole provided in the flange-shaped boss portion 44.

  In the present embodiment, the boss portion 44 is formed on the outer peripheral side of a later-described large-diameter portion 41 (and the small-diameter portion 42), and is disposed on the outer peripheral side of the stepped portion 11 in a state where the receiving fitting 4 is attached. . Since the outer peripheral side of the stepped portion 11 is a place where the load due to the action of the detachment force is easily received in the receptacle metal fitting 4, the mounting strength of the receptacle metal fitting 4 is enhanced by arranging the boss portion 44 in such a place. As a result, the number of fasteners 43 attached to the boss portion 44 can be reduced to contribute to weight reduction.

  As shown in FIGS. 3 and 4, the receiving metal fitting 4 has a large-diameter portion 41 having a relatively large inner diameter and a small-diameter portion 42 having a relatively small inner diameter. It is provided on the inner peripheral surface. The large diameter portion 41 is disposed on the outer peripheral side of the step portion 11, and the small diameter portion 42 is disposed on the outer peripheral side of the receiving tube portion 13. When the detachment force is applied, the small diameter portion 42 engages with the step portion 11 in a continuous region in the pipe circumferential direction. The receiving fitting 4 is firmly tightened with respect to the receiving opening 1 by the fastening operation of the fastener 43. In the present embodiment, since the contact surface is a so-called metal touch split surface, the variation of the tightening torque by the operator is suppressed, which is effective in ensuring performance.

  In the receptacle metal fitting 4 of this embodiment, the thickness of the small diameter part 42 is formed larger than the thickness of the large diameter part 41. For this reason, the strength of the small-diameter portion 42 engaged with the step portion 11 can be increased while the thickness of the large-diameter portion 41 is relatively reduced to reduce the weight. Moreover, in this receptacle metal fitting 4, the thickness of the large diameter part 41 is larger than the other parts at a plurality of places in the pipe circumferential direction, for example, the part shown in FIG. 4C, and has the same outer diameter as the small diameter part 42. doing. These locations function as reinforcing ribs that contribute to improving the strength of the receiving fitting 4. The position adjusting member 8 is provided at the same pipe circumferential position.

  The receptacle metal fitting 4 includes a position adjusting member 8 that protrudes from the inner peripheral surface of the receptacle metal fitting 4 and is configured so that the projection amount can be adjusted. The member 8 for position adjustment is attached to the through-hole formed in the receptacle metal fitting 4 (the small diameter part 42) in the multiple places (four places in this embodiment) of the pipe circumferential direction. The position adjusting member 8 is constituted by, for example, a hexagon socket set screw, and the protrusion amount can be increased or decreased by a rotating operation using a tool. The position adjusting member 8 does not engage with the stepped portion 11 and is used exclusively for adjusting the position of the receiving fitting 4.

  In the present embodiment, as described above, the large-diameter portion 41 having a relatively large inner diameter and disposed on the outer peripheral side of the step portion 11 is engaged with the step portion 11 having a relatively small inner diameter. However, the present invention is not limited to this. The socket fitting 4 includes the small-diameter portion 42 and the position adjusting member 8 that protrudes from the inner peripheral surface of the receptacle fitting 4 and that can be adjusted in its protruding amount. Instead, for example, the position adjusting member 8 can be omitted. In addition, the number of divisions (that is, the number of division surfaces) in the receptacle metal fitting 4 and the retaining metal fitting 5 can be appropriately changed in view of the required strength according to the application and size. The receiving fitting 4 and the retaining fitting 5 are made of ductile cast iron, but are not limited thereto.

  Since the retaining metal fitting 5 has a split structure in which split surfaces are provided at a plurality of locations in the pipe circumferential direction, it can be externally fitted to the receiving port 1 and the insertion port 2 of an existing pipe joint. In the present embodiment, the retaining metal fitting 5 has a quadrant structure, and split surfaces are provided at four locations in the pipe circumferential direction. As shown in FIGS. 1 and 2, in a state in which the retaining metal fitting 5 is mounted, the dividing surface is fastened by a fastener 52 composed of a bolt and a nut, and a plurality of divided pieces connected to each other are connected in an annular shape. A member used for a mechanical type pipe joint detachment preventing device (for example, see FIG. 3 of Patent Document 1) can be used for the retaining metal fitting 5.

  Although not shown, the claw members 6 are disposed at a plurality of locations in the pipe circumferential direction. The tip of the claw member 6 is curved along the pipe circumferential direction and is formed so as to be able to bite into the outer peripheral surface of the insertion slot 2. The claw member 6 is housed in a housing groove provided on the inner peripheral surface of the retaining metal fitting 5 and is configured to be pressed toward the inner peripheral side by a push bolt 7 provided in the housing groove. On the outer surface of the claw member 6, an inclined surface having a large diameter toward the receiving port 1 is formed, and when the detachment force is applied, the claw member 6 is locked to the outer peripheral surface of the insertion port 2 by a wedge effect. Is increased.

  The retaining metal fitting 5 is provided with a plurality of hooks 51 arranged at intervals in the pipe circumferential direction. Although not adopted in this embodiment in order to reduce the weight, hooks adjacent to each other in the pipe circumferential direction may be connected to each other. The hook 51 is disposed so as to cover the receptacle metal fitting 4 and faces the back surface of the receptacle fitting 4 (the surface facing the insertion insertion direction W) from the tube axis direction. When the detachment force is applied, the hook 51 is engaged with the back surface of the receptacle metal fitting 4, and the relative movement between the receptacle 1 and the insertion slot 2 is restricted. By mounting the receiving fitting 4 that raises the stepped portion 11, the engagement by the hook 51 is stably performed.

  The load receiving surface 40 is formed by a contact surface between the receiving fitting 4 and the hook 51. The load receiving surface 40 is provided at a position away from the step portion 11 in the insertion opening insertion direction W, and is disposed on the outer peripheral side of the receiving tube portion 13. Thereby, the load from the hook 51 is likely to act on the receiving fitting 4 along the tube axis direction, and the lifting of the receiving fitting 4 when a strong detachment force is applied can be prevented. FIG. 3 shows a state in which the hook 51 is engaged with the receiving fitting 4, but they may be separated in a situation where no detachment force is acting.

  In this device 10, since the load receiving surface 40 is provided on the outer peripheral side of the receiving port 1 as described above, a space for engaging the retaining fitting 5 with the receiving fitting 4 is provided on the front side of the receiving end surface 12 (insertion). There is no need to provide it on the opposite side of the mouth insertion direction W). Therefore, the retaining bracket 5 can be disposed close to the receiving end face 12, and the overall length of the apparatus becomes compact. As a result, for example, when the apparatus 10 is attached to a pipe joint whose insertion opening 2 is a curved pipe, the inconvenience that the claw member 6 interferes with a curved portion of the curved pipe can be avoided.

  In the present embodiment, as shown in FIG. 3, the receiving fitting 4 attached to the step portion 11 is configured not to have a portion facing the receiving end surface 12 from the tube axis direction, When the position of the receptacle metal fitting 4 is shifted in the insertion insertion direction W, the receptacle metal fitting 4 does not contact the receptacle end face 12. Thereby, according to the variation in the outer diameter of the receptacle 1 or the shape of the step part 11, the position of the receptacle metal fitting 4 in a pipe-axis direction can be finely adjusted. As a result, it is possible to prevent the inconvenience such that the fitting 4 attached to the stepped portion 11 is properly fixed and the split surface of the fitting 4 is opened by the action of the detachment force.

  In this embodiment, the separation preventing device 10 is attached to the pipe joint to prevent the insertion port 2 from being detached from the receiving port 1. In this pipe joint disengagement prevention method, the first step of mounting the receiving fitting 4 on the step portion 11 and engaging the inner peripheral surface of the receiving fitting 4 with the step portion 11 in the tube axis direction is performed. The stopper metal fitting 5 is attached to the outer periphery of the insertion slot 2, the claw member 6 provided in the stopper metal fitting 5 is locked to the outer peripheral surface of the insertion slot 2, and the hook 51 formed on the stopper metal fitting 5 is connected to the receptacle metal fitting 4. The load receiving surface 40 that receives the load from the hook 51 when the detachment force is applied is inserted into the insertion portion from the step portion 11. It is provided at a position away in the direction W.

  In the first step, as described above, the large-diameter portion 41 is disposed on the outer periphery of the step portion 11, and a region continuous in the pipe circumferential direction of the small-diameter portion 42 is engaged with the step portion 11. If necessary, the protruding amount of the position adjusting member 8 protruding from the inner peripheral surface of the receiving metal fitting 4 is adjusted to adjust the position of the receiving metal fitting 4 attached to the stepped portion 11. Thereby, the centering work (centering work) for uniformly engaging the receptacle metal fitting 4 with the step portion 11 can be easily performed, and the receptacle metal fitting is received even when a load due to the action of the detachment force is received. 4 division plane does not open. As described above, when the outer diameter of the receptacle 1 varies, the position of the receptacle fitting 4 in the tube axis direction can be finely adjusted.

  When the size of the pipe joint is large, for example, when the nominal diameter of the fluid pipes P1 and P2 is φ500 or more, the receiving fitting 4 and the retaining fitting 5 are heavy. In such a situation, in order to reduce the burden on the operator and shorten the construction time, it is preferable to suspend each temporarily assembled metal fitting with a crane or the like and lower it to attach it from above.

  FIG. 7 schematically shows a state in which the temporarily assembled receptacle fitting 4 is suspended. The upper ends of the wires 9 connected to the divided pieces 4A and 4B are connected to a crane (not shown). Of the two divided surfaces provided on the receiving fitting 4, the divided surface facing downward is opened widely, and the fastener 43 is loosely fastened on the divided surface facing upward. As shown in FIGS. 5 and 6, the provisionally assembled receptacle metal fitting 4 is lowered and externally fitted from above so as to cover the stepped portion 11 of the receptacle 1, and each divided surface is closed by fastening the fastener 43. It becomes a state.

  FIG. 8 schematically shows a state in which the temporarily assembled retaining bracket 5 is suspended. Of the four divided surfaces provided on the retaining bracket 5, the downwardly divided surface is wide open, and the fasteners 52 are loosely fastened on the remaining three divided surfaces. The temporarily assembled retaining metal fitting 5 is lowered and fitted from above so as to cover the insertion slot 2, and the fasteners 52 are tightened to close the respective divided surfaces, whereby the state shown in FIGS.

  In the mounting work of the retaining bracket 5, the boss portion 44 of the flange-shaped receptacle fitting 4 can be an obstacle when the hook 51 is disposed. Therefore, in this embodiment, in the first step, the boss portion 44 formed on one of the split surfaces of the receiving fitting 4 is directed upward (see FIGS. 5 and 6), and in the second step, The retaining bracket 5 is attached from above so that the hook 51 covers the receiving bracket 4, and the boss portion 44 is disposed in the gap of the hook 51 (see FIGS. 1 and 2). The gap between the hooks 51 is a gap between a pair of hooks 51 adjacent in the pipe circumferential direction.

  When attaching the retaining bracket 5 from above so that the hook 51 covers the receptacle fitting 4, if the boss portion 44 of the receptacle fitting 4 attached to the receptacle 1 interferes with the hook 51, workability is deteriorated. In the present embodiment, the position of the dividing surface of the retaining metal fitting 5 is matched with the position of the dividing surface of the receiving metal fitting 4, so that the boss portion 44 can be retained without interfering with the hook 51. The mounting work of the metal fitting 5 can be easily performed. The bolt heads and nuts of the fasteners 43 attached to the boss portion 44 are set at positions where the hooks 51 are avoided.

  In FIG. 3, the hook 51 is brought into contact with the back surface of the receiving metal fitting 4, but the present invention is not limited to this. The retaining metal fitting 5 is attached close to the receiving opening 1, and the hook 51 is attached to the receiving metal fitting as depicted by a broken line. 4 may be separated from the back surface. When the insertion slot 2 is about to come out of the receptacle 1 due to the action of the detachment force, the hook 51 is engaged with the receptacle fitting 4 and the separation prevention function is exhibited. Further, in such a case, a function that enables expansion / contraction between the receptacle insertion holes is provided, and the distance D from the hook 51 to the back surface of the receptacle fitting 4 is an expansion / contraction allowance.

  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.

DESCRIPTION OF SYMBOLS 1 Receptacle 2 Insertion 3 Sealing material 4 Receptacle fitting 5 Detachment fitting 6 Claw member 7 Push bolt 8 Position adjustment member 10 Detachment prevention device 11 Step part 12 Receptacle end face 13 Receptacle pipe part 14 Receptacle pipe part 40 Load receiving surface 41 Large diameter portion 42 Small diameter portion 43 Fastener 44 Boss 51 Hook 52 Fastener P1 Fluid pipe P2 Fluid pipe

Claims (10)

In the method of preventing the pipe joint from being removed by inserting and connecting the insertion port to the receiving port having a step portion on the outer periphery of the pipe end,
A first step of mounting an annular socket fitting on the stepped portion, and engaging an inner peripheral surface of the socket fitting with respect to the stepped portion in the tube axis direction;
An annular retaining bracket is attached to the outer periphery of the insertion slot, and a claw member provided in the retaining bracket is locked to the outer circumferential surface of the insertion slot, and a hook formed on the retaining bracket is attached to the receiving bracket. A second step of engaging in the tube axis direction from the outer peripheral side,
The tube is characterized in that a load receiving surface for receiving a load from the hook when an external force for detaching the insertion port from the receiving port acts is provided at a position farther in the insertion port insertion direction than the stepped portion. How to prevent the joint from coming off. The receptacle fitting has a large diameter portion with a relatively large inner diameter and a small diameter portion with a relatively small inner diameter,
2. The pipe joint disengagement according to claim 1, wherein in the first step, the large-diameter portion is disposed on an outer periphery of the step portion, and a region continuous in the pipe circumferential direction of the small-diameter portion is engaged with the step portion. Prevention method.   The pipe according to claim 1 or 2, wherein the position adjustment of the socket fitting mounted on the step portion is performed by adjusting a protruding amount of a position adjusting member protruding from an inner peripheral surface of the socket fitting. How to prevent the joint from coming off. In the first step, a boss formed on one of the split surfaces of the receptacle fitting having a split structure is directed upward,
The said 2nd process WHEREIN: The said metal fitting is mounted | worn from upper direction so that the said hook may cover the said receiving metal fitting, and the said boss | hub part is arrange | positioned in the clearance gap between the said hooks. How to prevent detachment of pipe joints. In the pipe joint detachment prevention device formed by inserting and connecting the insertion port to the receiving port having a stepped portion on the outer periphery of the tube end portion,
An annular socket fitting mounted on the stepped portion, and an annular retaining bracket attached to the outer periphery of the insertion slot,
The receptacle fitting has an inner peripheral surface that engages with the stepped portion in the tube axis direction,
The retaining bracket has a claw member that is engaged with the outer peripheral surface of the insertion opening, and a hook that is engaged with the receiving fitting in the tube axis direction from the outer peripheral side,
A load receiving surface that receives a load from the hook when an external force for detaching the insertion port from the receiving port is applied, is provided at a position farther in the insertion port insertion direction than the stepped portion. The pipe joint detachment prevention device.   The receptacle metal fitting has a relatively large inner diameter, a large diameter portion disposed on the outer periphery of the stepped portion, and a relatively small inner diameter, and the step in a region continuous in the pipe circumferential direction. The pipe joint detachment preventing device according to claim 5, further comprising a small diameter portion engaged with the portion.   The pipe joint detachment preventing device according to claim 6, wherein a thickness of the small diameter portion is formed larger than a thickness of the large diameter portion.   The pipe joint detachment preventing device according to any one of claims 5 to 7, wherein the socket fitting includes a position adjusting member configured to protrude from an inner peripheral surface of the socket fitting and adjust a protruding amount. .   The pipe joint according to any one of claims 5 to 8, wherein the socket fitting mounted on the stepped portion is configured not to have a portion facing the socket end face from the pipe axis direction. Detachment prevention device. A socket fitting mounted on the stepped portion with respect to the socket having a stepped portion on the outer periphery of the pipe end,
A large-diameter portion having a relatively large inner diameter and disposed on the outer peripheral side of the step portion;
A small-diameter portion having a relatively small inner diameter and engaged with the stepped portion in the tube axis direction in a region continuous in the tube circumferential direction;
A receptacle metal fitting, comprising: a position adjusting member configured to project from an inner peripheral surface of the receptacle metal fitting and adjust a projection amount.

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