JP2019074143A - Removal prevention pipe joint and pipe joint removal prevention method - Google Patents

Abstract

To provide a removal prevention pipe joint which stabilizes a posture of a reinforcement metal fitting attached to a pipe joint having an outer diameter difference to properly achieve a removal prevention function, and to provide a pipe joint removal prevention method.SOLUTION: An outer diameter D2 of a pipe P2 is smaller than an outer diameter D1 of a pipe P1, and a seal material 4 attached to an inner periphery of a socket 1 adheres to a spigot ring 21 provided at an outer periphery of a spigot 2. A reinforcement metal fitting 3 includes: an annular housing 30 having a housing groove 31 opening to the spigot 2; and an engagement part 32 which engages with the socket 1. The housing 30 is disposed at an outer periphery of an outer diameter adjustment ring 22 provided at the outer periphery of the spigot 2 separately from the spigot ring 21. The outer diameter adjustment ring 22 has a protrusion part 23 protruding to the outer periphery side further than an inner peripheral surface of the housing 30 and is configured so that the protrusion part 23 engages with the housing 30 to prevent removal when an external force that removes the spigot 2 from the socket 1 acts thereon.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to an anti-separation fitting that prevents an insertion from being removed from a socket, and a method for preventing removal of the fitting.

  Conventionally, there is known a so-called anti-separation fitting in which a reinforcing metal fitting is attached to a pipe fitting formed by inserting a socket into a receiving port so that the detachment preventing function can be exhibited. Generally, the reinforcing metal fitting includes an annular housing having a receiving groove opened toward the insertion port, and an engagement portion engaged with the socket. A claw member that can be locked to the outer peripheral surface of the insertion slot is housed in the housing groove, and the claw member can be pressed by the pressing member. Such a non-disengagement fitting is disclosed, for example, in Patent Document 1.

  It is usual for a pair of pipes which constitute a pipe joint to have the same pipe diameter mutually, and a metal fitting is designed supposing that it attaches to such a pipe joint. For this reason, in the pipe joint in which a pair of pipes P1 and P2 having pipe diameters different from each other as shown in FIG. 7 are connected, the posture of the reinforcing fitting can not be stabilized due to the outer diameter difference G. As a result, the original detachment prevention function may not be properly exhibited. Pipe joints having such an outer diameter difference are often used in pipe joints in which different pipe types such as cast iron pipes and steel pipes are connected.

JP, 2015-197191, A

  This invention is made in view of the said situation, The objective stabilizes the attitude | position of the reinforcing metal fitting attached to the pipe joint with an outer diameter difference, and can exhibit a detachment prevention function appropriately, detachment prevention It is an object of the present invention to provide a pipe joint and a method for preventing the detachment of the pipe joint.

  The detachment preventing fitting according to the present invention is a detachment preventing fitting in which a reinforcing metal fitting is attached to a fitting formed by inserting an inlet into a receiving port, and an outer diameter of a pipe having the inlet is the receiving port. The seal material smaller than the outer diameter of the tube having the opening, and attached to the inner periphery of the inlet, is in close contact with the insertion ring provided on the outer periphery of the insertion opening, and the reinforcing fitting is the insertion An annular housing having a receiving groove open toward the housing, and an engaging portion engaged with the receptacle, the housing being provided on an outer periphery of the insertion port separately from the insertion ring The outer diameter adjusting member or the insertion ring is disposed on the outer periphery of the diameter adjusting member or the outer periphery of the insertion ring, and the outer diameter adjusting member or the insertion ring has a protrusion that protrudes outward relative to the inner peripheral surface of the housing, When the external force acting to release the insertion from the receptacle acts, the projection Those that are configured to prevent separation engage the Ujingu.

  According to this anti-separation fitting, the housing of the reinforcing metal fitting is disposed on the outer periphery of the outer diameter adjusting member or the insertion ring while reducing the outer diameter difference while being a pipe joint having an outer diameter difference. The posture of the reinforcing bracket can be stabilized. Moreover, when the outer diameter adjusting member or the insertion ring has a projection and an external force (hereinafter sometimes referred to as a "disengagement force") acting to release the insertion from the receiving opening acts on the housing The disengagement prevention function can be appropriately exhibited by engaging.

  When the protrusion is disposed to face the side surface on the receiving side of the housing, the work of attaching the reinforcement fitting to the pipe joint may be simplified. When the detachment force acts, the projection is engaged with the side surface on the receiving side of the housing to prevent detachment. In such a configuration, a posture adjustment member is disposed in the accommodation groove, and protrudes toward the inner peripheral side relative to the inner peripheral surface of the housing to contact the outer diameter adjustment member or the outer peripheral surface of the insertion ring. Is preferred. By bringing the attitude adjustment member into contact with the outer diameter adjustment member or the outer peripheral surface of the insertion ring, rattling of the housing can be suppressed, the reinforcement fitting can be stabilized in a more appropriate posture, and the centering operation can be simplified. Become.

  When the projection is disposed in the accommodation groove, the projection is engaged with the groove wall surface of the accommodation groove to prevent the detachment when the detachment force acts. In such a configuration, it is preferable to include a pressing member that is inserted into the through hole formed in the housing and that can press the protrusion in the accommodation groove. By pressing the projection with the pressing member, the rattling of the housing can be suppressed, the reinforcement fitting can be stabilized in a more appropriate posture, and the centering operation can be simplified.

  Another detachment preventing fitting according to the present invention is a detachment preventing fitting in which a reinforcement fitting is attached to a fitting formed by inserting an inlet into a socket, and the outer diameter of a pipe having the above inlet is the above-mentioned A seal material smaller than the outer diameter of the tube having a socket and attached to the inner periphery of the socket is in close contact with an insertion ring provided on the outer periphery of the insertion port, and the reinforcing metal fitting The housing includes an annular housing having a receiving groove opened toward the insertion port, and an engagement portion engaged with the receiving port, and the housing is provided on an outer periphery of the insertion port separately from the insertion port ring. The pawl member is disposed on the outer periphery of the outer diameter adjusting member or the outer periphery of the insertion ring, and the claw member accommodated in the accommodation groove is moved to the outer diameter when an external force that causes the insertion hole to be released from the receiving opening acts. Locking to the adjustment member or the outer peripheral surface of the insertion ring to prevent disengagement. It is those that have been.

  According to this anti-separation fitting, the housing of the reinforcing metal fitting is disposed on the outer periphery of the outer diameter adjusting member or the insertion ring while reducing the outer diameter difference while being a pipe joint having an outer diameter difference. The posture of the reinforcing bracket can be stabilized. In addition, the claw member is housed in the housing groove, and when the detachment force is applied, the claw member can be engaged with the outer diameter adjusting member or the outer peripheral surface of the insertion ring so that the detachment prevention function can be appropriately exhibited. .

  The pipe having the port may be made of a material other than cast iron. In the present invention, since the detachment preventing function is exhibited by the projection engaging with the housing or the claw member engaging with the outer diameter adjusting member or the outer peripheral surface of the insertion ring, the cast iron pipe can be exhibited. Reinforcement fittings designed on the assumption that they are attached to each other can be used without any problem, and the detachment prevention function can be appropriately exhibited.

  The method for preventing detachment of a pipe joint according to the present invention is a method for preventing detachment of a pipe joint, in which a reinforcing metal fitting is attached to a pipe joint formed by inserting a socket into a receiving port so that the function for preventing detachment can be exhibited. In the pipe joint, the outer diameter of the pipe having the inlet is smaller than the outer diameter of the pipe having the inlet, and the sealing material mounted on the inner periphery of the inlet is provided on the outer periphery of the inlet When the reinforcing metal fitting is attached to the pipe fitting, the annular housing provided on the reinforcing metal fitting is attached to the inlet ring, and the annular housing is provided on the outer periphery of the inlet separately from the inlet ring. When an external force that acts on the outer periphery of the diameter adjustment member or the outer periphery of the insertion ring and engages the engaging portion provided in the reinforcing metal fitting with the receiving port and causes the insertion port to separate from the receiving port acts , The outer diameter adjusting member or the insertion ring Parts are those that prevent a separation is engaged with the housing.

  According to this method, by arranging the housing of the reinforcing metal fitting on the outer periphery of the outer diameter adjusting member or the insertion ring for a pipe joint having an outer diameter difference, the outer diameter difference is reduced and the posture of the reinforcing metal fitting is Can be stabilized. In addition, when the detachment force is applied, the detachment prevention function can be appropriately exhibited by engaging the protrusion of the outer diameter adjustment member or the insertion ring with the housing.

  Another method for preventing separation of a pipe joint according to the present invention is a method for preventing separation of a pipe joint, in which a reinforcing metal fitting is attached to a pipe joint having an insertion port inserted into a socket to exhibit a function for preventing separation. In the pipe joint, the outer diameter of the pipe having the inlet is smaller than the outer diameter of the pipe having the inlet, and the sealing material mounted on the inner periphery of the inlet is provided on the outer periphery of the inlet An annular housing provided to the reinforcing fitting is provided on the outer periphery of the insert separately from the inserting ring when the reinforcing fitting is attached to the pipe joint. The external force adjusting member is disposed on the outer periphery of the outer diameter adjusting member or the outer periphery of the insertion ring, and an engaging portion provided in the reinforcing metal fitting is engaged with the receiving port, and an external force acts to release the insertion from the receiving port. When the housing is contained in the holding groove It is to prevent a separation by a member to engage with the outer peripheral surface of the outer diameter adjusting member or the spigot ring.

  According to this method, by arranging the housing of the reinforcing metal fitting on the outer periphery of the outer diameter adjusting member or the insertion ring for a pipe joint having an outer diameter difference, the outer diameter difference is reduced and the posture of the reinforcing metal fitting is Can be stabilized. In addition, when the detachment force acts, the detachment prevention function can be appropriately exhibited by locking the claw member on the outer peripheral surface of the outer diameter adjustment member or the insertion ring.

Sectional drawing which shows an example of the detachment preventing fitting which concerns on 1st Embodiment of this invention. A view of the anti-separation fitting of FIG. 1 as viewed along the axial direction of the pipe A view of the anti-separation fitting of FIG. 1 as viewed in the radial direction of the pipe Sectional view showing a modification of the first embodiment Sectional drawing which shows an example of the detachment preventing fitting which concerns on 2nd Embodiment of this invention. Sectional drawing which shows an example of the detachment preventing fitting which concerns on 3rd Embodiment of this invention. Cross section showing an example of a pipe joint with an outer diameter difference

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

First Embodiment
FIG. 1 is a cross-sectional view showing an example of a detachment preventing pipe joint according to a first embodiment of the present invention, and corresponds to a cross section taken along the line A-A in FIG. The separation preventing fitting is configured by attaching a reinforcing fitting 3 to a pipe fitting formed by inserting the insertion port 2 into the receiving port 1. FIG. 2 is a view of the anti-disengagement joint as viewed from the socket 1 side (left side in FIG. 1) along the axial direction of the pipe. FIG. 3 is a view of the anti-separation fitting viewed along the radial direction of the pipe, and the reinforcing fitting 3 is shown in cross section.

  The receptacle 1 is formed at the end of a pipe P1 which is a fluid pipe. The insertion port 2 is formed at the end of the pipe P2, which is a fluid pipe. In the present embodiment, an example in which the pair of pipes P1 and P2 are water pipes is shown. The pipes P1 and P2 are connected to each other in a watertight manner via the sealing material 4 mounted on the inner circumference of the receptacle 1. The fluid flowing inside the pipes P1 and P2 is not limited to the clean water, and may be, for example, industrial water, sewage, gas, a gas-liquid mixture of gas and liquid, or the like.

  T-head bolts 12 are inserted through the flanges 11 provided on the outer periphery of the receiving port 1 at a plurality of locations (20 locations in the present embodiment) in the circumferential direction of the tube as shown in FIG. A push ring 13 is fastened to the socket 1 via a fastener consisting of the T-head bolt 12 and a nut (not shown). The push ring 13 is drawn to the flange 11 by the tightening of the fastener, and the sealing member 4 compressed accordingly secures the sealing performance. The sealing material 4 is annularly formed along the pipe circumferential direction.

  In this pipe joint, the outer diameter D2 of the pipe P2 having the inlet 2 is smaller than the outer diameter D1 of the pipe P1 having the inlet 1, and an outer diameter difference G is generated. The outer diameter difference G is determined by the equation (outer diameter D1−outer diameter D2) / 2. Pipe joints with such an outer diameter difference G are often used in pipe joints where different pipe types are connected. In the present embodiment, the pipes P1 and P2 are formed of a metal material. Specifically, an example is shown in which the pipe P1 is a cast iron pipe (ductile iron pipe) and the pipe P2 is a steel pipe. Thus, the pipe P2 may be formed of a material other than cast iron, and may be, for example, a stainless steel pipe.

  Since the sealing material 4 is a ready-made product used for a general pipe joint without an outer diameter difference, a gap is formed between the sealing material 4 mounted on the inner periphery of the receiving port 1 and the insertion port 2 Ru. So, in this pipe joint, the insertion ring 21 is provided in the outer periphery of the insertion port 2 so that the clearance gap may be filled. The seal member 4 mounted on the inner periphery of the socket 1 is in close contact with the insertion ring 21 to ensure the sealing performance. The insertion ring 21 is fixed to the pipe P2 by welding. The insertion ring 21 extends along the tube circumferential direction as shown in FIG. The outer diameter D21 of the insertion ring 21 is set to substantially the same size as the outer diameter D1. The insertion ring 21 is formed of, for example, a steel material such as SS material.

  The reinforcing metal fitting 3 includes an annular housing 30 having a housing groove 31 opened toward the insertion port 2, and an engagement portion 32 engaged with the receptacle 1. The housing 30 has a split structure divided at a plurality of locations (five locations in this embodiment) in the pipe circumferential direction as shown in FIG. Since the housing 30 has a split structure, the reinforcing fitting 3 can be attached to the existing pipe joint. A connector 33 is attached to the divided portion of the housing 30. The connector 33 is composed of a bolt and a nut. A plurality of (five in the present embodiment) divided pieces constituting the housing 30 are annularly connected via the connecting tool 33.

  In the present embodiment, the engaging portion 32 is formed by a hook that engages with the flange 11. The engaging portions 32 are provided at equal intervals at a plurality of locations (20 locations in the present embodiment) in the tube circumferential direction. When the detachment force acts, the engaging portion 32 engages with the flange 11 in the tube axis direction, and prevents the tubes P1, P2 from moving relative to each other in the direction in which the insertion port 2 is detached from the receiving port 1. Although not employed in the present embodiment for weight reduction, the tips of the hooks adjacent in the tube circumferential direction may be connected to each other. Moreover, although the engaging part 32 is formed as a member integral with the housing 30, it is not restricted to this. For example, the engaging portion 32 may be formed of a member separate from the housing 30, and may be connected to each other.

  The housing groove 31 is formed on the inner peripheral surface of the housing 30. The claw member 34 is accommodated in the accommodation groove 31. The claw members 34 are disposed at a plurality of locations in the pipe circumferential direction. Although the accommodation groove 31 is formed as an annular groove continuously extended along the tube circumferential direction, the invention is not limited thereto, and a plurality of arc-shaped accommodation grooves 31 are intermittently provided, and a claw is formed in each of them. The member 34 may be housed. The claw members 34 are formed of a robust material such as ductile cast iron. The reinforcing fitting 3 includes a pressing bolt 35 for pressing the claw member 34 toward the insertion opening 2. The push bolt 35 is inserted into a through hole formed in the housing 30. The push bolt 35 is screwed into a female screw formed on the inner circumferential surface of the through hole. In the present embodiment, the claw member 34 and the pressing bolt 35 may be removed, or the through hole may be omitted.

  In the present embodiment, an outer diameter adjusting ring 22 as an outer diameter adjusting member is provided on the outer periphery of the insertion opening 2 separately from the insertion opening ring 21. The outer diameter adjustment ring 22 is fixed to the pipe P2 by welding or the like. The outer diameter D22 of the outer diameter adjustment ring 22 is smaller than the inner diameter D30 of the housing 30. The outer diameter D22 is preferably substantially the same as or larger than the outer diameter D1 of the pipe P1 in a range not exceeding the inner diameter D30. The outer diameter adjustment ring 22 is formed of, for example, a steel material such as SS material. The housing 30 is disposed on the outer periphery of the outer diameter adjustment ring 22. Reinforcing metal fitting 3 is an existing product used for general pipe joints not having an outer diameter difference like seal member 4 and pressing ring 13, but housing 30 is disposed on the outer periphery of outer diameter adjusting ring 22. The posture of the reinforcing fitting 3 can be stabilized by reducing the outer diameter difference G.

  The outer diameter adjustment ring 22 has a protrusion 23 that protrudes to the outer peripheral side than the inner peripheral surface of the housing 30. The outer diameter D23 of the protrusion 23 is larger than the inner diameter D30 of the housing 30. When the detachment force acts, the projection 23 engages with the housing 30 in the tube axial direction. Thus, the protrusion 23 is engaged with the housing 30. Thus, combined with the effect of stabilizing the posture of the reinforcing metal fitting 3 by the outer diameter adjustment ring 22, detachment of the pipe joint can be appropriately prevented. In addition, since it is possible to use the reinforcing metal fitting 3 which is a ready-made product, it is not necessary to prepare a reinforcing metal fitting as a dedicated item specialized for a pipe joint with an outer diameter difference G, which contributes to cost reduction.

  As shown in FIG. 1, the outer diameter adjustment ring 22 is formed of a member having an L-shaped cross section, and the protrusion 23 is provided integrally with the outer diameter adjustment ring 22. In this case, since the strength of the projection 23 is secured well, the detachment prevention function can be sufficiently exhibited. However, the present invention is not limited to this. The protrusion 23 may be formed of a member separate from the outer diameter adjustment ring 22 and the protrusion 23 may be fixed to the insertion opening 2 or the outer diameter adjustment ring 22 by welding or the like. As described above, in the case where the projections 23 are separately fixed by welding, it is preferable to provide a weld bead at a location that does not interfere with the housing 30 engaged with the projections 23.

  In the present embodiment, the outer diameter adjustment ring 22 and the projection 23 respectively extend annularly along the tube circumferential direction. According to this configuration, since the length of the weld bead is increased, the strength of the projection 23 is improved, and the detachment prevention function can be sufficiently exhibited. The annular outer diameter adjustment ring 22 and the projection 23 can be formed by connecting a plurality of arc-shaped members (for example, two semicircular members) in the pipe circumferential direction. However, the present invention is not limited to this, and the outer diameter adjusting member may be disposed intermittently along the pipe circumferential direction, and the protrusion 23 is also the same. According to this configuration, when the pipe P2 is not a perfect circle, for example, even when the pipe P2 is deformed somewhat flat, the outer diameter adjusting member and the projection 23 can be easily provided on the outer periphery of the insertion port 2. it can.

  In the present embodiment, the protrusion 23 is disposed to face the side surface of the receiving port 1 side (left side in FIG. 1) of the housing 30. In this case, the work of attaching the reinforcing metal fitting 3 to the pipe joint may be simplified as compared with the second embodiment described later. When the detachment force acts, the projection 23 is engaged with the side surface on the receiving port 1 side of the housing 30 to prevent detachment. At that time, it is preferable that the projection 23 be in surface contact with (the side surface of) the housing 30 so that the detachment prevention function can be more sufficiently exhibited.

  In the present embodiment, the reinforcing fitting 3 is provided with the attitude adjusting member 36. The posture adjustment member 36 is disposed in the accommodation groove 31, protrudes toward the inner peripheral side relative to the inner peripheral surface of the housing 30, and contacts the outer peripheral surface of the outer diameter adjustment ring 22. Thereby, rattling of the housing 30 (falling of the housing 30 to the receiving port 1 side or the insertion port 2 side) can be suppressed, and the reinforcing metal fitting 3 can be stabilized in a more appropriate posture. Furthermore, the effect of simplifying the centering operation of the housing 30 with respect to the pipes P1, P2 can be obtained. The use of the attitude adjusting member 36 is particularly useful when the difference between the outer diameter D22 of the outer diameter adjusting ring 22 and the inner diameter D30 of the housing 30 is large.

  In the present embodiment, the claw member 34 originally provided in the reinforcing fitting 3 is used as the posture adjustment member 36. The claw member 34 as the posture adjustment member 36 is used to stabilize the posture of the reinforcing fitting 3 and is not intended for the detachment prevention effect by itself, so the outer peripheral surface of the outer diameter adjustment ring 22 There is no need to bite the tip. Also, instead of the claw member 34, a spacer member may be accommodated in the accommodation groove 31 and used as the posture adjustment member. The spacer member is formed of, for example, a resin. Alternatively, neither the claw member 34 nor the spacer member is used, and the push bolt 35 is replaced with a push bolt longer than that to be a posture adjustment member, and the tip of the long push bolt contacts the outer peripheral surface of the outer diameter adjustment ring 22 You may Parts costs can be reduced by not using the claw members 34.

  The reinforcing metal fitting 3 may not have the posture adjusting member. In that case, the outer diameter D22 is made larger than the outer diameter D1 or the outer diameter D21 by increasing the thickness of the outer diameter adjustment ring 22 or the like so that the rattling of the housing 30 can be suppressed. Closeness is preferred. When the posture adjusting member is not provided, it is preferable to remove the claw member 34 to make the housing groove 31 empty from the viewpoint of cost reduction. Furthermore, it is preferable to remove the push bolt 35 from the housing 30. In that case, in order to enhance the corrosion resistance, it is preferable to close the through hole after removing the push bolt 35 with a filler. For the filling, a round rubber having a cylindrical shape, a bolt shorter than the push bolt 35, or the like can be used.

  FIG. 4 shows a modification of the first embodiment. The insertion ring 21 provided in this pipe joint has a sufficient length so as to be able to replace the outer diameter adjusting ring 22 described above. In this configuration, the housing 30 is disposed on the outer periphery of the insertion ring 21, and the insertion ring 21 has a protrusion 23. The projection 23 is formed of a member separate from the insertion ring 21 and is fixed to the insertion ring 21 by welding or the like. Alternatively, the insertion ring 21 may be formed of a member having a T-shaped cross section, and the protrusion 23 may be provided integrally with the insertion ring 21. The claw member 34 as the posture adjustment member 36 contacts the outer peripheral surface of the insertion ring 21, whereby rattling of the housing 30 is suppressed.

  Thus, the detachment prevention function can be exhibited by attaching the reinforcing fitting 3 to the pipe joint formed by inserting the insertion port 2 into the receiving port 1. As described above, in the pipe joint to which the reinforcing metal fitting 3 is attached, the outer diameter D2 of the pipe P2 is smaller than the outer diameter D1 of the pipe P1, and the seal member 4 attached to the inner periphery of the socket 1 is an insertion ring 21 closely attached. When attaching the reinforcing metal fitting 3 to the pipe joint, the annular housing 30 is disposed on the outer periphery of the outer diameter adjustment ring 22 or the outer periphery of the insertion ring 21, and the engagement portion 32 is engaged with the socket 1. When the detachment force acts, the projection 23 of the outer diameter adjustment ring 22 or the insertion ring 21 is engaged with the housing 30 to prevent detachment.

Second Embodiment
The second embodiment is the same as the first embodiment except the matters described below, so the common points are omitted and the differences are mainly described. The same members and portions as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. FIG. 5 is a cross-sectional view showing an example of the detachment preventing pipe joint according to the second embodiment of the present invention.

  In the present embodiment, the protrusion 23 is disposed in the accommodation groove 31. When the detachment force acts, the projection 23 is engaged with the groove wall surface of the insertion slot 2 side (right side in FIG. 5) of the accommodation groove 31 to prevent detachment. At that time, it is preferable that the projection 23 be in surface contact with (the groove wall surface of the housing groove 31 of) the housing 30, whereby the detachment prevention function can be exhibited more sufficiently. The outer diameter adjustment ring 22 is formed of a member having a T-shaped cross section, and the projection 23 is provided integrally with the outer diameter adjustment ring 22. However, the present invention is not limited to this, and the projection 23 may be configured by a member separate from the outer diameter adjustment ring 22 and may be fixed to the outer diameter adjustment ring 22 by welding or the like.

  In the present embodiment, a pressing bolt 35 as a pressing member capable of pressing the protrusion 23 in the housing groove 31 is provided. The push bolt 35 is inserted into a through hole formed in the housing 30. The push bolt 35 is screwed into a female screw formed on the inner circumferential surface of the through hole. By pressing the projection 23 with the push bolt 35, rattling of the housing 30 can be suppressed and the reinforcement fitting 3 can be stabilized in a more appropriate posture. Furthermore, the effect of simplifying the centering operation of the housing 30 with respect to the pipes P1, P2 can be obtained. Also, since no claw member is used, it contributes to cost reduction. In the present embodiment, the tip end of the push bolt 35 is in surface contact with the projection 23 in order to effectively suppress the rattling of the housing 30. The tip of the push bolt 35 is inclined toward the outer peripheral side toward the receptacle 1, and the outer peripheral surface of the projection 23 is also inclined.

  The use of the push bolt 35 as described above is particularly useful when the difference between the outer diameter D22 of the outer diameter adjustment ring 22 and the inner diameter D30 of the housing 30 is large. However, the reinforcing metal fitting 3 may not include the pressing member, and in such a case, the thickness of the outer diameter adjusting ring 22 may be increased to suppress the rattling of the housing 30, and the outer diameter D22 may be reduced. Is preferably made larger than the outer diameter D1 or the outer diameter D21 and close to the inner diameter D30 of the housing 30. Moreover, when not providing a press member, in order to improve corrosion resistance, it is preferable to obstruct | occlude a through-hole by stuffing. Round rubber and short bolts can be used for the filling.

  Although illustration is omitted, as a modification of the second embodiment, as in the modification of the first embodiment (refer to FIG. 4), the insertion ring 21 is sufficiently enough to be able to replace the outer diameter adjustment ring 22. A long composition is mentioned. In this configuration, the housing 30 is disposed on the outer periphery of the insertion ring 21, and the insertion ring 21 has the projection 23. The projection 23 is formed of a member separate from the insertion ring 21 and is fixed to the insertion ring 21 by welding or the like. Alternatively, the insertion ring 21 may be formed of a member having a T-shaped cross section, and the protrusion 23 may be provided integrally with the insertion ring 21.

Third Embodiment
The third embodiment is the same as the first embodiment except the matters described below, so the common points are omitted and the differences are mainly described. The same members and portions as those described in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. FIG. 6 is a cross-sectional view showing an example of the detachment preventing pipe joint according to the third embodiment of the present invention.

  In the present embodiment, when the detachment force acts, the claw members 34 accommodated in the accommodation groove 31 are engaged with the outer peripheral surface of the outer diameter adjustment ring 22 to prevent the detachment. The tip end of the claw member 34 is curved along the circumferential direction of the pipe, and is formed so as to bite into the outer peripheral surface of the outer diameter adjustment ring 22 and to be able to be locked. An inclined surface having a large diameter toward the receptacle 1 is formed on the outer peripheral surface of the claw member 34, and the engagement of the claw member 34 with the outer peripheral surface of the outer diameter adjustment ring 22 is performed by the chewing effect when the detachment force is applied. Stop action is enhanced.

  Although illustration is omitted, as a modification of the third embodiment, as in the modification of the first embodiment (see FIG. 4), the insertion ring 21 is sufficiently sufficient to be able to replace the outer diameter adjustment ring 22. A long composition is mentioned. In such a configuration, the housing 30 is disposed on the outer periphery of the insertion ring 21, whereby the posture of the reinforcing fitting 3 can be stabilized. Further, the claw member 34 is engaged with the outer peripheral surface of the insertion ring 21 to prevent the insertion 2 from being detached from the socket 1.

  Thus, the detachment prevention function can be exhibited by attaching the reinforcing fitting 3 to the pipe joint formed by inserting the insertion port 2 into the receiving port 1. As described above, in the pipe joint to which the reinforcing metal fitting 3 is attached, the outer diameter D2 of the pipe P2 is smaller than the outer diameter D1 of the pipe P1, and the seal member 4 attached to the inner periphery of the socket 1 is an insertion ring 21 closely attached. When attaching the reinforcing metal fitting 3 to the pipe joint, the annular housing 30 is disposed on the outer periphery of the outer diameter adjustment ring 22 or the outer periphery of the insertion ring 21, and the engagement portion 32 is engaged with the socket 1. When the detachment force acts, the claw members 34 accommodated in the accommodation groove 31 are engaged with the outer diameter adjusting ring 22 or the outer peripheral surface of the insertion ring 21 to prevent the detachment.

  In the first to third embodiments described above, in the mechanical type pipe joint in which the seal member 4 is compressed and sealed by the push ring 13, the example in which the engaging portion 32 of the reinforcing metal fitting 3 engages with the flange 11 of the socket 1 Although indicated, it is not limited to this. For example, in a push-on type pipe joint in which the socket has a self-sealing function, the engaging part of the reinforcing fitting may be engaged with the stepped part of the socket. In a pipe joint used for a ductile cast iron pipe, a T-type, an NS-type, a GX-type or the like is standardized as a socket having such a step. The engaging portion is not limited to the hook as long as it is structured to engage with the receptacle.

  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 Socket 2 Insertion 3 Reinforcement 4 Seal material 11 Flange 12 T-head bolt 13 Push ring 21 Insertion ring 22 Outer diameter adjustment ring (outer diameter adjustment member)
Reference Signs List 23 protrusion 30 housing 31 housing groove 32 engagement portion 34 claw member 35 push bolt (press member)
36 Posture adjustment member P1 pipe P2 pipe

Claims (9)

A separation preventing fitting in which a reinforcing fitting is attached to a pipe fitting having a socket inserted into a socket,
In an insertion ring provided on the outer periphery of the insertion opening, the seal material mounted on the inner periphery of the insertion opening, the outer diameter of the pipe having the insertion opening being smaller than the outer diameter of the pipe having the reception opening Closely attached,
The reinforcing metal fitting includes an annular housing having a housing groove opened toward the insertion port, and an engagement portion engaged with the receiving port, and the housing is separately inserted from the insertion ring. It is disposed on the outer periphery of the outer diameter adjusting member provided on the outer periphery of the mouth or on the outer periphery of the insertion ring,
The outer diameter adjusting member or the insertion ring has a protrusion which protrudes to the outer peripheral side than the inner peripheral surface of the housing, and when the external force acting to separate the insertion from the receiving port acts, the protrusion A non-disengagement fitting characterized in that the section engages with the housing to prevent detachment.   The detachment preventing pipe joint according to claim 1, wherein the protrusion is disposed to face a side surface on the receiving port side of the housing.   The attitude adjusting member according to claim 2, further comprising: a posture adjusting member which is disposed in the housing groove and which protrudes to the inner peripheral side than the inner peripheral surface of the housing and contacts the outer diameter adjusting member or the outer peripheral surface of the insertion ring. Anti-disengagement fittings.   The non-disengagement pipe joint according to claim 1, wherein the projection is disposed in the accommodation groove.   The detachment preventing pipe joint according to claim 4, further comprising: a pressing member which is inserted into the through hole formed in the housing and capable of pressing the protrusion in the accommodation groove. A separation preventing fitting in which a reinforcing fitting is attached to a pipe fitting having a socket inserted into a socket,
In an insertion ring provided on the outer periphery of the insertion opening, the seal material mounted on the inner periphery of the insertion opening, the outer diameter of the pipe having the insertion opening being smaller than the outer diameter of the pipe having the reception opening Closely attached,
The reinforcing metal fitting includes an annular housing having a housing groove opened toward the insertion port, and an engagement portion engaged with the receiving port, and the housing is separately inserted from the insertion ring. It is disposed on the outer periphery of the outer diameter adjusting member provided on the outer periphery of the mouth or on the outer periphery of the insertion ring,
When an external force for removing the insertion from the receptacle acts, a claw member accommodated in the accommodation groove is engaged with the outer diameter adjusting member or the outer peripheral surface of the insertion ring to prevent the detachment. A detachment preventing fitting characterized in that it is configured.   The non-disengagement fitting according to any one of claims 1 to 6, wherein the pipe having the insertion port is formed of a material other than cast iron. A method for preventing detachment of a pipe joint, comprising attaching a reinforcing metal fitting to a pipe joint formed by inserting a socket into a socket, so that the separation preventing function can be exhibited,
In the pipe joint, an outer diameter of a pipe having the inlet is smaller than an outer diameter of a pipe having the inlet, and a sealing material mounted on an inner periphery of the inlet is provided on an outer periphery of the inlet Closely attached to the insertion ring,
When attaching the reinforcing metal fitting to the pipe joint, an annular housing provided in the reinforcing metal fitting is the outer periphery of the outer diameter adjusting member provided on the outer periphery of the inlet separately from the inlet ring or the inlet ring And the engaging portion provided on the reinforcing metal fitting is engaged with the socket, and
A pipe joint characterized by engaging a protrusion of the outer diameter adjusting member or the insertion ring with the housing to prevent detachment when an external force causing the insertion from the receptacle is released. How to prevent A method for preventing detachment of a pipe joint, comprising attaching a reinforcing metal fitting to a pipe joint formed by inserting a socket into a socket, so that the separation preventing function can be exhibited,
In the pipe joint, an outer diameter of a pipe having the inlet is smaller than an outer diameter of a pipe having the inlet, and a sealing material mounted on an inner periphery of the inlet is provided on an outer periphery of the inlet Closely attached to the insertion ring,
When attaching the reinforcing metal fitting to the pipe joint, an annular housing provided in the reinforcing metal fitting is the outer periphery of the outer diameter adjusting member provided on the outer periphery of the inlet separately from the inlet ring or the inlet ring And the engaging portion provided on the reinforcing metal fitting is engaged with the socket, and
When an external force is applied to release the insertion from the receptacle, the claw member accommodated in the accommodation groove of the housing is engaged with the outer diameter adjusting member or the outer peripheral surface of the insertion ring to release the attachment. A method of preventing detachment of a pipe joint characterized by preventing.

Images