JP6860913B2 - Detachment prevention pipe joint and method to prevent disconnection of pipe joint - Google Patents

Description

The present invention relates to a detachment prevention pipe joint that prevents the insertion port from detaching from the socket, and a method for preventing the disconnection of the pipe joint.

Conventionally, a so-called detachment prevention pipe joint is known in which a reinforcing metal fitting is attached to a pipe joint formed by inserting an insertion port into a socket so that a detachment prevention function can be exhibited. Generally, the reinforcing metal fitting includes an annular housing having an accommodating groove opened toward the insertion port and an engaging portion that engages with the receiving port. A claw member that can be locked on the outer peripheral surface of the insertion slot is accommodated in the accommodating groove, and the claw member can be pressed by the pressing member. Such a detachment prevention pipe joint is disclosed in, for example, Patent Document 1.

A pair of pipes constituting a pipe joint usually have the same pipe diameter, and the reinforcing metal fittings are designed assuming that they are attached to such a pipe joint. Therefore, in a pipe joint in which a pair of pipes P1 and P2 having different pipe diameters are connected as shown in FIG. 7, the posture of the reinforcing metal fitting cannot be stabilized due to their outer diameter difference G. As a result, the original detachment prevention function may not be properly exhibited. Pipe fittings with such an outer diameter difference are often used for pipe fittings in which different pipe types such as cast iron pipes and steel pipes are connected to each other.

Japanese Unexamined Patent Publication No. 2015-197191

The present invention has been made in view of the above circumstances, and an object of the present invention is to stabilize the posture of a reinforcing metal fitting attached to a pipe joint having an outer diameter difference and appropriately exert a detachment prevention function. It is an object of the present invention to provide a pipe joint and a method for preventing the pipe joint from coming off.

The detachment prevention pipe joint according to the present invention is a detachment prevention pipe joint in which a reinforcing metal fitting is attached to a pipe joint formed by inserting an insertion port into a socket, and the outer diameter of the pipe having the insertion port is the socket. The sealing material attached to the inner circumference of the socket, which is smaller than the outer diameter of the pipe having the above, is in close contact with the insertion ring provided on the outer periphery of the insertion opening, and the reinforcing metal fitting is the insertion opening. The housing comprises an annular housing having an accommodating groove that opens toward the mouth and an engaging portion that engages with the socket, and the housing is provided on the outer periphery of the slot separately from the slot ring. The outer diameter adjusting member or the insertion ring is arranged 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 protruding toward the outer periphery from the inner peripheral surface of the housing. It is configured so that when an external force for detaching the insertion port from the receiving port acts, the protrusion engages with the housing to prevent the insertion port from detaching.

According to this detachment prevention pipe joint, although the pipe joint has an outer diameter difference, the outer diameter difference is reduced by arranging the housing of the reinforcing metal fitting on the outer diameter adjusting member or the outer circumference of the insertion ring. The posture of the reinforcing metal fittings can be stabilized. Moreover, when the outer diameter adjusting member or the insertion ring has a protrusion and an external force for detaching the insertion from the socket (hereinafter, may be referred to as "disengagement force") acts, this protrusion acts on the housing. By engaging, the detachment prevention function can be properly exerted.

When the protrusion is arranged so as to face the side surface of the housing on the receiving side, the work of attaching the reinforcing metal fitting to the pipe joint can be simplified. When a detaching force is applied, the protrusion engages with the side surface of the housing on the receiving side to prevent the housing from detaching. In such a configuration, a posture adjusting member which is arranged in the accommodating groove and projects toward the inner peripheral side of the inner peripheral surface of the housing and comes into contact with the outer diameter adjusting member or the outer peripheral surface of the insertion ring is provided. Is preferable. By bringing the posture adjusting member into contact with the outer diameter adjusting member or the outer peripheral surface of the insertion ring, rattling of the housing can be suppressed, the reinforcing metal fittings can be stabilized in a more appropriate posture, and centering work can be easily performed. Become.

When the protrusion is arranged in the accommodation groove, when a detaching force is applied, the protrusion engages with the groove wall surface of the accommodation groove to prevent detachment. In such a configuration, it is preferable to include a pressing member that is inserted into the through hole formed in the housing and can press the protrusion in the accommodating groove. By pressing the protrusion with the pressing member, rattling of the housing can be suppressed, the reinforcing metal fittings can be stabilized in a more appropriate posture, and centering work becomes easy.

Another detachment prevention pipe joint according to the present invention is a detachment prevention pipe joint in which a reinforcing metal fitting is attached to a pipe joint formed by inserting an insertion port into a socket, and the outer diameter of the pipe having the insertion port is the said. The sealing material, which is smaller than the outer diameter of the pipe having the socket and is attached to the inner circumference of the socket, is in close contact with the insertion ring provided on the outer periphery of the socket. An annular housing having an accommodating groove that opens toward the insertion slot and an engaging portion that engages with the socket are provided, and the housing is provided on the outer periphery of the insertion slot separately from the insertion opening ring. The claw member accommodated in the accommodating groove is arranged on the outer circumference of the outer diameter adjusting member or the outer periphery of the insertion ring, and when an external force for detaching the insertion opening from the socket acts, the claw member accommodated in the accommodation groove has the outer diameter. It is configured to be locked to the outer peripheral surface of the adjusting member or the insertion ring to prevent detachment.

According to this detachment prevention pipe joint, although the pipe joint has an outer diameter difference, the outer diameter difference is reduced by arranging the housing of the reinforcing metal fitting on the outer diameter adjusting member or the outer circumference of the insertion ring. The posture of the reinforcing metal fittings can be stabilized. Moreover, the claw member is accommodated in the accommodating groove, and when a detaching force is applied, the claw member is locked to the outer diameter adjusting member or the outer peripheral surface of the insertion ring, so that the detachment prevention function can be appropriately exerted. ..

The pipe having the insertion port may be made of a material other than cast iron. In the present invention, the cast iron pipe exerts the detachment prevention function by engaging the protrusion with the housing or by engaging the claw member with the outer diameter adjusting member or the outer peripheral surface of the insertion ring. Reinforcing metal fittings designed to be attached to each other's pipe joints can be used without any trouble, and the detachment prevention function can be appropriately exerted.

The method for preventing detachment of a pipe joint according to the present invention is a method for preventing detachment of a pipe joint, which is a method for preventing detachment of a pipe joint by attaching a reinforcing metal fitting to the pipe joint formed by inserting an insertion port into a receiving port so as to exhibit a detachment prevention function. In the pipe joint, the outer diameter of the pipe having the socket is smaller than the outer diameter of the pipe having the socket, and a sealing material attached to the inner circumference of the socket is provided on the outer circumference of the socket. It is in close contact with the insertion opening ring, and when the reinforcing metal fitting is attached to the pipe joint, the annular housing provided with the reinforcing metal fitting is provided on the outer periphery of the insertion port separately from the insertion ring. When it is arranged on the outer circumference of the diameter adjusting member or the outer circumference of the insertion ring, and when an external force is applied to engage the engaging portion provided with the reinforcing metal fitting with the socket and disengage the insertion from the socket. , The outer diameter adjusting member or the protrusion of the insertion ring is engaged with the housing to prevent detachment.

According to this method, for a pipe joint having an outer diameter difference, the housing of the reinforcing metal fitting is arranged on the outer circumference of the outer diameter adjusting member or the insertion ring to reduce the outer diameter difference and the posture of the reinforcing metal fitting. Can be stabilized. Moreover, when a detachment force is applied, the detachment prevention function can be appropriately exerted by engaging the protrusion of the outer diameter adjusting member or the insertion ring with the housing.

Another 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 the pipe joint formed by inserting an insertion port into a socket so that a detachment prevention function can be exhibited. In the pipe joint, the outer diameter of the pipe having the socket is smaller than the outer diameter of the pipe having the socket, and a sealing material attached to the inner circumference of the socket is provided on the outer circumference of the socket. When the reinforcing metal fitting is attached to the pipe joint, the annular housing provided by the reinforcing metal fitting is provided on the outer periphery of the insertion port separately from the insertion ring. In addition to being arranged on the outer circumference of the outer diameter adjusting member or the outer circumference of the insertion ring, an external force that engages the engaging portion provided with the reinforcing metal fitting with the socket and disengages the insertion from the socket acts. Occasionally, the claw member housed in the housing groove of the housing is locked to the outer diameter adjusting member or the outer peripheral surface of the insertion ring to prevent detachment.

According to this method, for a pipe joint having an outer diameter difference, the housing of the reinforcing metal fitting is arranged on the outer circumference of the outer diameter adjusting member or the insertion ring to reduce the outer diameter difference and the posture of the reinforcing metal fitting. Can be stabilized. Moreover, when a detachment force is applied, the detachment prevention function can be appropriately exerted by locking the claw member to the outer diameter adjusting member or the outer peripheral surface of the insertion ring.

Sectional drawing which shows an example of the detachment prevention pipe joint which concerns on 1st Embodiment of this invention. The view which looked at the detachment prevention pipe joint of FIG. 1 along the pipe axis direction. The view which saw the detachment prevention pipe joint of FIG. 1 along the pipe radial direction. Sectional drawing which shows the modification of 1st Embodiment Sectional drawing which shows an example of the detachment prevention pipe joint which concerns on 2nd Embodiment of this invention. Sectional drawing which shows an example of the detachment prevention pipe joint which concerns on 3rd Embodiment of this invention. Cross-sectional view 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 prevention pipe joint according to the first embodiment of the present invention, and corresponds to the cross section taken along the line AA of FIG. This detachment prevention pipe joint is configured by attaching the reinforcing metal fitting 3 to the pipe joint formed by inserting the insertion port 2 into the receiving port 1. FIG. 2 is a view of the detachment prevention pipe joint viewed from the receiving port 1 side (left side in FIG. 1) along the pipe axis direction. FIG. 3 is a view of the detachment prevention pipe joint viewed along the pipe radial direction, and the reinforcing metal fitting 3 is represented by a cross section.

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

As shown in FIG. 2, T-head bolts 12 are inserted into 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 pipe circumferential direction. The push ring 13 is fastened to the receiving port 1 via a fastener composed of the T-head bolt 12 and a nut (not shown). The push ring 13 is attracted to the flange 11 by tightening the fastener, and the sealing performance is ensured by the sealing material 4 compressed accordingly. The sealing material 4 is formed in an annular shape along the circumferential direction of the pipe.

In this pipe joint, the outer diameter D2 of the pipe P2 having the insertion port 2 is smaller than the outer diameter D1 of the pipe P1 having the receiving port 1, and an outer diameter difference G is generated. The outer diameter difference G is obtained by the formula (outer diameter D1-outer diameter D2) / 2. A pipe joint having such an outer diameter difference G is often used as a pipe joint in which different pipe types are connected to each other. In this embodiment, the tubes P1 and P2 are made of a metal material. Specifically, an example is shown in which the pipe P1 is a cast iron pipe (ductile cast iron pipe) and the pipe P2 is a steel pipe. As described above, the pipe P2 may be made of a material other than cast iron, and may be, for example, a stainless steel pipe.

Since the sealing material 4 is an off-the-shelf product used for a general pipe joint having no difference in outer diameter, a gap is formed between the sealing material 4 mounted on the inner circumference of the receiving port 1 and the insertion port 2. To. Therefore, in this pipe joint, an insertion ring 21 is provided on the outer periphery of the insertion port 2 so as to fill the gap. The sealing material 4 attached to the inner circumference of the receiving port 1 is in close contact with the insertion ring 21, thereby ensuring the sealing performance. The insertion ring 21 is fixed to the pipe P2 by welding. The insertion ring 21 extends along the circumferential direction of the pipe as shown in FIG. The outer diameter D21 of the insertion ring 21 is set to have substantially the same size as the outer diameter D1. The insertion ring 21 is made of a steel material such as an SS material.

The reinforcing metal fitting 3 includes an annular housing 30 having an accommodating groove 31 that opens toward the insertion port 2, and an engaging portion 32 that engages with the receiving port 1. As shown in FIG. 2, the housing 30 has a split structure divided at a plurality of locations (five locations in the present embodiment) in the circumferential direction of the pipe. Since the housing 30 has a split structure, the reinforcing metal 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 bolts and nuts. A plurality of (five in this embodiment) divided pieces constituting the housing 30 are connected in an annular shape via a connector 33.

In this embodiment, the engaging portion 32 is formed by a hook that engages with the flange 11. The engaging portions 32 are provided at a plurality of locations (20 locations in the present embodiment) in the circumferential direction of the pipe at equal intervals. When the disengagement force acts, the engaging portion 32 engages with the flange 11 in the pipe axis direction, and prevents the pipes P1 and P2 from moving relative to each other in the direction in which the insertion port 2 is disengaged from the receiving port 1. Although not adopted in this embodiment in order to reduce the weight, the tips of hooks adjacent to each other in the circumferential direction of the pipe may be connected to each other. Further, the engaging portion 32 is formed as a member integrated with the housing 30, but is not limited 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 accommodating groove 31 is formed on the inner peripheral surface of the housing 30. The claw member 34 is accommodated in the accommodating groove 31. The claw members 34 are arranged at a plurality of locations in the circumferential direction of the pipe. The accommodating groove 31 is formed as an annular groove continuously extending along the circumferential direction of the pipe, but the present invention is not limited to this. The member 34 may be accommodated. The claw member 34 is made of a robust material such as ductile cast iron. The reinforcing metal fitting 3 includes a push bolt 35 that presses the claw member 34 toward the insertion port 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 peripheral surface of the through hole. In the present embodiment, the claw member 34 and the push bolt 35 may be removed, and the through hole may not be provided.

In the present embodiment, the outer diameter adjusting ring 22 as the outer diameter adjusting member is provided on the outer periphery of the insertion port 2 separately from the insertion opening ring 21. The outer diameter adjusting ring 22 is fixed to the pipe P2 by welding or the like. The outer diameter D22 of the outer diameter adjusting 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 within a range not exceeding the inner diameter D30. The outer diameter adjusting ring 22 is made of a steel material such as an SS material. The housing 30 is arranged on the outer periphery of the outer diameter adjusting ring 22. The reinforcing metal fitting 3 is a ready-made product used for a general pipe joint having no outer diameter difference like the sealing material 4 and the push ring 13, but the housing 30 is arranged on the outer circumference of the outer diameter adjusting ring 22. , The outer diameter difference G can be reduced to stabilize the posture of the reinforcing metal fitting 3.

The outer diameter adjusting ring 22 has a protrusion 23 protruding toward the outer peripheral side of 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 detaching force acts, the protrusion 23 engages with the housing 30 in the pipe axial direction. By engaging the protrusion 23 with the housing 30 in this way, the outer diameter adjusting ring 22 can appropriately prevent the pipe joint from coming off, in combination with the effect of stabilizing the posture of the reinforcing metal fitting 3. Moreover, since the ready-made reinforcing metal fitting 3 can be used, it is not necessary to prepare a reinforcing metal fitting as a special product specialized for a pipe joint having an outer diameter difference G, which contributes to cost reduction.

As shown in FIG. 1, the outer diameter adjusting ring 22 is formed of a member having an L-shaped cross section, and the protrusion 23 is provided integrally with the outer diameter adjusting ring 22. In this case, since the strength of the protrusion 23 is sufficiently ensured, the detachment prevention function can be sufficiently exerted. However, the present invention is not limited to this, and the protrusion 23 may be formed of a member separate from the outer diameter adjusting ring 22, and the protrusion 23 may be fixed to the insertion port 2 or the outer diameter adjusting ring 22 by welding or the like. When the protrusions 23 are separately fixed by welding in this way, it is preferable to provide a welding bead at a position that does not interfere with the housing 30 that engages with the protrusions 23.

In the present embodiment, the outer diameter adjusting ring 22 and the protrusion 23 extend in an annular shape along the circumferential direction of the pipe. According to such a configuration, since the length of the weld bead is increased, the strength of the protrusion 23 is improved, and by extension, the detachment prevention function can be sufficiently exhibited. The annular outer diameter adjusting ring 22 and the protrusion 23 can be formed by connecting a plurality of arcuate members (for example, two semicircular members) in the circumferential direction of the pipe. However, the present invention is not limited to this, and the outer diameter adjusting member may be arranged intermittently along the circumferential direction of the pipe, and the same applies to the protrusion 23. According to such a configuration, even if the pipe P2 is not a perfect circle, for example, even if the pipe P2 is deformed to be somewhat flat, an outer diameter adjusting member or a protrusion 23 can be easily provided on the outer periphery of the insertion port 2. it can.

In the present embodiment, the protrusion 23 is arranged so as to face the side surface of the housing 30 on the receiving port 1 side (left side in FIG. 1). In this case, as compared with the second embodiment described later, the work of attaching the reinforcing metal fitting 3 to the pipe joint can be simplified. When the detaching force acts, the protrusion 23 engages with the side surface of the housing 30 on the receiving port 1 side to prevent the housing 30 from detaching. At that time, the protrusion 23 preferably comes into surface contact with (the side surface of) the housing 30, whereby the detachment prevention function can be more fully exhibited.

In the present embodiment, the reinforcing metal fitting 3 includes the posture adjusting member 36. The posture adjusting member 36 is arranged in the accommodating groove 31, and projects toward the inner peripheral side of the inner peripheral surface of the housing 30 and comes into contact with the outer peripheral surface of the outer diameter adjusting ring 22. As a result, the housing 30 can be prevented from rattling (the housing 30 falls down to the receiving port 1 side or the insertion port 2 side), and the reinforcing metal fitting 3 can be stabilized in a more appropriate posture. Further, the effect of simplifying the centering work of the housing 30 with respect to the pipes P1 and P2 can be obtained. The use of the posture 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 metal fitting 3 is used as the posture adjusting member 36. The claw member 34 as the posture adjusting member 36 is used to stabilize the posture of the reinforcing metal fitting 3, and since the effect of preventing detachment by itself is not intended, the claw member 34 is placed on the outer peripheral surface of the outer diameter adjusting ring 22. There is no need to bite into the tip. Further, instead of the claw member 34, a spacer member may be accommodated in the accommodating groove 31 and used as a posture adjusting member. The spacer member is made of, for example, a resin. Alternatively, without using the claw member 34 or the spacer member, the push bolt 35 is used as a posture adjusting member instead of the longer pushing bolt, and the tip of the long pushing bolt comes into contact with the outer peripheral surface of the outer diameter adjusting ring 22. You may let me. By not using the claw member 34, the component cost can be reduced.

The reinforcing metal fitting 3 does not have to include 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 adjusting ring 22 so as to suppress the rattling of the housing 30, and the inner diameter D30 of the housing 30 is used. It is preferable to bring them closer. When the posture adjusting member is not provided, it is preferable to remove the claw member 34 to leave the accommodating groove 31 empty from the viewpoint of cost reduction. Further, it is preferable to remove the push bolt 35 from the housing 30. In that case, in order to improve the corrosion resistance, it is preferable to close the through hole after removing the push bolt 35 with a padding. For the filling, a columnar round rubber, a bolt shorter than the push bolt 35, or the like can be used.

FIG. 4 shows a modified example of the first embodiment. The insertion ring 21 provided in this pipe joint has a sufficient length to replace the outer diameter adjusting ring 22 described above. In this configuration, the housing 30 is arranged on the outer periphery of the insertion ring 21, and the insertion ring 21 has a protrusion 23. The protrusion 23 is composed 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 adjusting member 36 comes into contact with the outer peripheral surface of the insertion ring 21, thereby suppressing the rattling of the housing 30.

In this way, by attaching the reinforcing metal fitting 3 to the pipe joint formed by inserting the insertion port 2 into the receiving port 1, the detachment prevention function can be exhibited. 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 sealing material 4 attached to the inner circumference of the receiving port 1 is an insertion ring. It is in close contact with 21. When attaching the reinforcing metal fitting 3 to the pipe joint, the annular housing 30 is arranged on the outer circumference of the outer diameter adjusting ring 22 or the outer circumference of the insertion ring 21, and the engaging portion 32 is engaged with the receiving port 1. When the detaching force acts, the protrusion 23 of the outer diameter adjusting ring 22 or the insertion ring 21 is engaged with the housing 30 to prevent the detachment.

[Second Embodiment]
Since the second embodiment is the same as the first embodiment except for the matters described below, the differences will be mainly described by omitting the common points. The same members and parts as those described in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted. FIG. 5 is a cross-sectional view showing an example of a detachment prevention pipe joint according to a second embodiment of the present invention.

In the present embodiment, the protrusion 23 is arranged in the accommodating groove 31. When a detaching force acts, the protrusion 23 engages with the groove wall surface on the insertion port 2 side (right side in FIG. 5) of the accommodating groove 31 to prevent detachment. At that time, the protrusion 23 preferably comes into surface contact with the housing 30 (the groove wall surface of the accommodating groove 31), whereby the detachment prevention function can be more fully exhibited. The outer diameter adjusting ring 22 is formed of a member having a T-shaped cross section, and the protrusion 23 is provided integrally with the outer diameter adjusting ring 22. However, the present invention is not limited to this, and the protrusion 23 may be formed of a member separate from the outer diameter adjusting ring 22 and may be fixed to the outer diameter adjusting ring 22 by welding or the like.

In the present embodiment, a push bolt 35 is provided as a pressing member capable of pressing the protrusion 23 in the accommodating groove 31. 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 peripheral surface of the through hole. By pressing the protrusion 23 with the push bolt 35, rattling of the housing 30 can be suppressed and the reinforcing metal fitting 3 can be stabilized in a more appropriate posture. Further, the effect of simplifying the centering work of the housing 30 with respect to the pipes P1 and P2 can be obtained. In addition, since no claw member is used, it contributes to cost reduction. In the present embodiment, the tip of the push bolt 35 is in surface contact with the protrusion 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 receiving port 1, and the outer peripheral surface of the protrusion 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 adjusting ring 22 and the inner diameter D30 of the housing 30 is large. However, the reinforcing metal fitting 3 does not have to be provided with a pressing member. In that case, the outer diameter D22 is increased by increasing the thickness of the outer diameter adjusting ring 22 so as to suppress the rattling of the housing 30. Is larger than the outer diameter D1 or the outer diameter D21, and is preferably close to the inner diameter D30 of the housing 30. Further, when the pressing member is not provided, it is preferable to close the through hole with a padding in order to improve the corrosion resistance. Round rubber or short bolts can be used for stuffing.

Although not shown, as a modification of the second embodiment, the insertion ring 21 is sufficiently sufficient to replace the outer diameter adjusting ring 22 as in the modification of the first embodiment (see FIG. 4). There is a long configuration. In such a configuration, the housing 30 is arranged on the outer periphery of the insertion ring 21, and the insertion ring 21 has a protrusion 23. The protrusion 23 is composed 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]
Since the third embodiment is the same as the first embodiment except for the matters described below, the differences will be mainly described by omitting the common points. The same members and parts as those described in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted. FIG. 6 is a cross-sectional view showing an example of a detachment prevention pipe joint according to a third embodiment of the present invention.

In the present embodiment, when a detaching force is applied, the claw member 34 accommodated in the accommodating groove 31 is locked to the outer peripheral surface of the outer diameter adjusting ring 22 to prevent the detachment. The tip 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 adjusting ring 22 and be locked. An inclined surface having a large diameter toward the receiving port 1 is formed on the outer peripheral surface of the claw member 34, and when a detaching force acts, the claw member 34 engages with the outer peripheral surface of the outer diameter adjusting ring 22 due to the wedge effect. The stopping action is enhanced.

Although not shown, as a modification of the third embodiment, the insertion ring 21 is sufficiently sufficient to replace the outer diameter adjusting ring 22 as in the modification of the first embodiment (see FIG. 4). There is a long configuration. In such a configuration, the housing 30 is arranged on the outer periphery of the insertion ring 21, whereby the posture of the reinforcing metal fitting 3 can be stabilized. Further, the claw member 34 is locked to the outer peripheral surface of the insertion port ring 21 to prevent the insertion port 2 from being detached from the receiving port 1.

In this way, by attaching the reinforcing metal fitting 3 to the pipe joint formed by inserting the insertion port 2 into the receiving port 1, the detachment prevention function can be exhibited. 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 sealing material 4 attached to the inner circumference of the receiving port 1 is an insertion ring. It is in close contact with 21. When attaching the reinforcing metal fitting 3 to the pipe joint, the annular housing 30 is arranged on the outer circumference of the outer diameter adjusting ring 22 or the outer circumference of the insertion ring 21, and the engaging portion 32 is engaged with the receiving port 1. When the detaching force acts, the claw member 34 accommodated in the accommodating groove 31 is locked to the outer peripheral surface of the outer diameter adjusting ring 22 or the insertion ring 21 to prevent the detaching.

In the first to third embodiments described above, in a mechanical type pipe joint in which the sealing material 4 is compressed and sealed by the push ring 13, the engaging portion 32 of the reinforcing metal fitting 3 engages with the flange 11 of the receiving port 1. However, it is not limited to this. For example, in a push-on type pipe joint in which the receiving port has a self-sealing function, the engaging portion of the reinforcing metal fitting may be engaged with the step portion of the receiving port. In pipe joints used for ductile cast iron pipes, T-type, NS-type, GX-type and the like are standardized as sockets having such a stepped portion. The engaging portion is not limited to the hook as long as it has a structure that engages with the socket.

The present invention is not limited to the above-described embodiment, and various improvements and changes can be made without departing from the spirit of the present invention.

1 Receiving port 2 Insertion port 3 Reinforcing metal fitting 4 Sealing material 11 Flange 12 T head bolt 13 Push ring 21 Insertion ring 22 Outer diameter adjustment ring (outer diameter adjustment member)
23 Protrusion 30 Housing 31 Housing groove 32 Engaging part 34 Claw member 35 Push bolt (pressing member)
36 Posture adjustment member P1 pipe P2 pipe

Claims (9)

It is a detachment prevention pipe joint in which a reinforcing metal fitting is attached to a pipe joint formed by inserting an insertion port into a socket.
The outer diameter of the tube having the socket is smaller than the outer diameter of the tube having the socket, and the sealing material attached to the inner circumference of the socket is attached to the insertion ring provided on the outer circumference of the socket. It is in close contact and
The reinforcing metal fitting includes an annular housing having an accommodating groove opened toward the insertion port and an engaging portion that engages with the receiving port, and the housing is provided with the insertion portion separately from the insertion opening ring. It is arranged on the outer circumference of the outer diameter adjusting member provided on the outer circumference of the mouth or the outer circumference of the insertion ring.
The outer diameter adjusting member or the insertion ring has a protrusion protruding toward the outer peripheral side from the inner peripheral surface of the housing, and when an external force for detaching the insertion from the receiving port acts, the protrusion A detachment prevention pipe joint characterized in that a portion is configured to engage with the housing to prevent detachment. The detachment prevention pipe joint according to claim 1, wherein the protrusion is arranged so as to face the side surface of the housing on the receiving side. The second aspect of the present invention includes a posture adjusting member which is arranged in the accommodating groove and projects toward the inner peripheral side of the inner peripheral surface of the housing and comes into contact with the outer diameter adjusting member or the outer peripheral surface of the insertion ring. Detachment prevention pipe fitting. The detachment prevention pipe joint according to claim 1, wherein the protrusion is arranged in the accommodating groove. The detachment prevention pipe joint according to claim 4, further comprising a pressing member which is inserted into a through hole formed in the housing and can press the protrusion in the accommodating groove. It is a detachment prevention pipe joint in which a reinforcing metal fitting is attached to a pipe joint formed by inserting an insertion port into a socket.
The outer diameter of the tube having the socket is smaller than the outer diameter of the tube having the socket, and the sealing material attached to the inner circumference of the socket is attached to the insertion ring provided on the outer circumference of the socket. It is in close contact and
The reinforcing metal fitting includes an annular housing having an accommodating groove opened toward the insertion port and an engaging portion that engages with the receiving port, and the housing is provided with the insertion portion separately from the insertion opening ring. It is arranged on the outer circumference of the outer diameter adjusting member provided on the outer circumference of the mouth or the outer circumference of the insertion ring.
When an external force for detaching the insertion port is applied from the receiving port, the claw member accommodated in the accommodation groove is locked to the outer diameter adjusting member or the outer peripheral surface of the insertion opening ring to prevent the insertion port from being detached. A detachment prevention pipe joint characterized by being configured in. The detachment prevention pipe joint according to any one of claims 1 to 6, wherein the pipe having the insertion port is made of a material other than cast iron. It is a method of preventing the disconnection of the pipe joint by attaching a reinforcing metal fitting to the pipe joint formed by inserting the insertion port into the socket so that the detachment prevention function can be exhibited.
In the pipe joint, the outer diameter of the pipe having the socket is smaller than the outer diameter of the pipe having the socket, and a sealing material attached to the inner circumference of the socket is provided on the outer periphery of the socket. It is in close contact with the insertion ring.
When the reinforcing metal fitting is attached to the pipe joint, the annular housing provided in the reinforcing metal fitting is attached to the outer circumference of the outer diameter adjusting member or the insertion ring ring provided on the outer circumference of the insertion port separately from the insertion ring. While arranging it on the outer circumference of the above, the engaging portion provided with the reinforcing metal fitting is engaged with the receiving port.
A pipe joint characterized in that when an external force for detaching the insertion port is applied from the receiving port, the protrusion portion of the outer diameter adjusting member or the insertion port ring is engaged with the housing to prevent the insertion port from being detached. How to prevent withdrawal. It is a method of preventing the disconnection of the pipe joint by attaching a reinforcing metal fitting to the pipe joint formed by inserting the insertion port into the socket so that the detachment prevention function can be exhibited.
In the pipe joint, the outer diameter of the pipe having the socket is smaller than the outer diameter of the pipe having the socket, and a sealing material attached to the inner circumference of the socket is provided on the outer periphery of the socket. It is in close contact with the insertion ring.
When the reinforcing metal fitting is attached to the pipe joint, the annular housing provided in the reinforcing metal fitting is attached to the outer circumference of the outer diameter adjusting member or the insertion ring ring provided on the outer circumference of the insertion port separately from the insertion ring. In addition to being arranged on the outer circumference of the above, the engaging portion provided by the reinforcing metal fitting is engaged with the receiving port.
When an external force for detaching the insertion port is applied from the receiving port, the claw member accommodated in the accommodation groove of the housing is locked to the outer diameter adjusting member or the outer peripheral surface of the insertion opening ring to release the insertion port. A method for preventing disconnection of a pipe joint, which is characterized by preventing the pipe joint from coming off.

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