JP2020101194A - Pipe joint and joining method of pipe - Google Patents

Abstract

To provide a pipe joint capable of preventing falling of a spacer and reducing a labor hour necessary for joining pipes.SOLUTION: A spigot 5 of one pipe 4 is inserted to a socket 3 of the other pipe 2, an annular housing space 25 is formed between an inner periphery of the socket 3 and an outer periphery of the spigot 5, and a seal member 26 for sealing between the socket 3 and the spigot 5, a pressor ring 29 pressing the seal member 26 to keep a compression state, and a spacer 30 for keeping a clearance between the pressor ring 29 and a depth end 19 of the socket 3 in a pipe axial direction 7, are housed in the housing space 25. The spacer 30 is held between the pressor ring 29 and the depth end 19 of the socket 3 and held in the housing space 25, and a falling prevention member 50 for preventing falling of the spacer 30 is disposed on the spacer 30 and housed in the housing space 25.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe joint in which an insertion port is inserted in a receiving port and a method for joining pipes.

Conventionally, as this type of pipe joint, for example, as shown in FIGS. 28 and 29, the insertion port 104 of the other pipe 103 is inserted into the receiving port 102 of the one pipe 101, and is inserted into the inner periphery of the receiving port 102. An annular seal member accommodating space is formed between the seal member accommodating space and the outer periphery of the opening 104, and the seal member is made of an annular rubber member and seals the inner periphery of the receiving opening 102 and the outer periphery of the inserting opening 104. There is one in which 106 is accommodated. A push ring 108 that presses the seal member 106 into the seal member accommodating space via the split ring 107 and keeps it in a compressed state is provided inside the receiving port 102 of the pipe joint 100.

Plural bolts 111 and connecting rods 112 are provided in the circumferential direction between the push ring 108 and the rear end surface 110 of the receiving port 102. The bolt 111 is screwed into the push ring 108, and as the bolt 111 is unwound from the push ring 108, the connecting rod 112 pushes the rear end surface 110 of the receiving port 102, and the reaction force causes the push ring 108 to split. The seal member 106 is pushed into the seal member accommodating space via the ring 107, and the seal member 106 is kept in a compressed state and exhibits a predetermined sealing function.

The space between the push ring 108 and the rear end surface 110 of the receiving port 102 is filled with the mortar material 121.

According to this, the gap 120 between the push ring 108 and the rear end surface 110 of the receiving port 102 in the pipe axis direction is kept at a predetermined gap by the bolt 111 and the connecting rod 112. Further, as shown in FIG. 29, since the bolt 111 and the connecting rod 112 are embedded inside the mortar material 121, the connecting rod 112 is prevented from dropping from between the bolt 111 and the rear end surface 110 of the receiving port 102. can do.

The above-mentioned pipe joint is described in, for example, Patent Document 1 below.

Japanese Patent Laid-Open No. 2006-70994

However, in the above-described conventional type, it is necessary to embed the splicing rod 112 inside the mortar material 121 in order to prevent the splicing rod 112 from falling off, which requires time and labor for applying the mortar material 121 and the time required for joining the pipes. It took labor.

It is an object of the present invention to provide a pipe joint and a pipe joining method capable of preventing the spacer from falling off and reducing the labor required for joining the pipes.

In order to achieve the above object, the first invention is a pipe joint in which a seal member, a push ring, and a spacer are mounted from inside a pipe,
The insertion opening of the other pipe is inserted into the receiving opening of one pipe,
An annular accommodation space is formed between the inner circumference of the receiving opening and the outer circumference of the insertion opening,
A seal member that seals between the receiving opening and the insertion opening in the accommodation space, a push ring that presses the sealing member to keep it in a compressed state, and a spacer that maintains a gap between the push ring and the back end of the receiving opening in the tube axis direction. And are housed,
The spacer is sandwiched between the push ring and the rear end of the receiving port and held in the accommodation space.
The spacer is provided with a stopper member for preventing the spacer from falling off and is housed in the housing space.

According to this, the spacer can prevent the spacer from dropping from between the push ring and the rear end of the receiving port. Therefore, it is not necessary to embed the spacer inside the mortar material in order to prevent the spacer from falling off, and the labor required for joining the pipes can be reduced.

In the pipe joint according to the second aspect of the present invention, a plurality of spacers are provided at predetermined intervals in the pipe circumferential direction.

In the pipe joint according to the third aspect of the present invention, the drop-off preventing member is made of an elastic body, and at least one contact portion that comes into contact with the push ring when the spacer is about to fall off and at least the back end of the receiving port when the spacer is about to fall off. The other abutting portion that abuts, and the connecting portion provided between the one abutting portion and the other abutting portion,
The continuous portion is deformable in the pipe axis direction.

According to this, when at least the spacer is about to fall off, one of the contact portions of the fall prevention member abuts on the push ring, and the other abutment portion abuts on the rear end of the receiving port to prevent the spacer from falling off. To be done.

In the pipe joint according to the fourth aspect of the present invention, one contact portion is provided on one contact member,
The other contact portion is provided on the other contact member,
The connecting portion is provided between one contact member and the other contact member,
The one and the other abutting members are fitted onto the spacer and slidable in the tube axial direction with respect to the spacer.

In the pipe joint according to the fifth aspect of the present invention, the shape of the fall prevention member in the pipe radial direction on the inner surface side is different from the shape on the outer surface side.

According to this, when the spacer is mounted from the inside of the pipe, it is possible to prevent the drop-out prevention member from being accidentally attached in the opposite direction in the pipe radial direction.

The sixth invention is a method for joining pipes using the pipe joint according to the fourth invention,
With the insertion opening inserted in the receiving opening, an opening is formed between the tip of the insertion opening and the rear end of the receiving opening,
Set the seal member and the push ring from the inside of the pipe to the outside of the insertion port in the pipe radial direction,
With the gap between one of the contact members and the other contact member of the fall prevention member attached to the spacer reduced, the spacer is sandwiched between the push ring and the rear end of the receiving port,
At least one abutting member and the other abutting member of the drop-off preventing member are arranged so that at least one of the abutting portions abuts on the push ring and the other abutting portion abuts on the rear end of the receiving port at least when the spacer is about to fall off. Widen the space between
By further inserting the insertion opening into the receiving opening and shortening the opening in the pipe axis direction, the sealing member, the push ring, and the spacer are provided in the accommodation space formed between the inner circumference of the receiving opening and the outer circumference of the insertion opening. And a fall prevention member.

As described above, according to the present invention, it is possible to prevent the spacer from coming off from between the push ring and the rear end of the receiving port by the fall prevention member. Therefore, in order to prevent the spacer from coming off, the spacer is made of a mortar material. Since it is not necessary to embed the inside of the tube, it is possible to reduce the labor required for joining the tubes.

Further, since the continuous portion of the captive prevention member expands and contracts in the tube axis direction, it is possible to absorb a slight change in the distance between the push ring and the rear end of the receiving port, so that the spacer is reliably prevented from falling out. You can

Further, since one abutting portion of the captive prevention member abuts on the push ring and the other abutting portion abuts on the rear end of the receiving opening, the position of the captive prevention member is not displaced in the pipe axis direction. Can be prevented.

It is a sectional view of a pipe joint in an embodiment of the invention. FIG. 3 is a sectional view of a receiving port of the pipe joint. FIG. 3 is a view of a lock ring of the pipe joint of the same. FIG. 3 is a view of a sealing member of the pipe joint, in which a part is shown in cross section. FIG. 3 is a partially enlarged sectional view of the pipe joint. It is a XX arrow line view in FIG. FIG. 3 is a view of the push ring of the pipe joint. FIG. 8 is a view on arrow XX in FIG. 7. FIG. 8 is a view on arrow YY in FIG. 7. FIG. 6 is a perspective view of the pipe joint when viewed from the outer surface side of the fall-out preventing member. FIG. 6 is a perspective view of the pipe joint when viewed from the inner surface side of the fall-out prevention member. FIG. 6 is a perspective view of the spacer to which the fall prevention member of the pipe joint is attached. It is a XX arrow line view in FIG. FIG. 6B is a side view of the spacer to which the fall prevention member of the pipe joint is attached, showing a state in which the fall prevention member is deformed. FIG. 6 is a sectional view showing a method of joining pipes of the pipe joint, showing a state in which a push ring and a lock ring are inserted into a receiving port. FIG. 6 is a cross-sectional view showing a method of joining pipes of the same pipe joint, showing a state in which the diameter of the lock ring is expanded using a shrimp vise. FIG. 6B is a diagram showing a method for joining pipes of the same pipe joint, showing a state in which the diameter of the lock ring is expanded using a shrimp vise. FIG. 11 is a diagram showing a method of joining pipes of the same pipe joint, showing a state in which a stopper for preventing diameter reduction is fitted into the divided portion of the lock ring. FIG. 6 is a cross-sectional view showing a method of joining pipes of the pipe joint, showing a state in which a diameter reduction preventing stopper is fitted in a divided portion of a lock ring. FIG. 6 is a perspective view of a diameter reduction preventing stopper used when joining pipes of the pipe joint. FIG. 5 is a cross-sectional view showing a method of joining pipes of the pipe joint, showing a state in which the insertion port is inserted into the receiving port and the sealing member is deposited in the receiving port. FIG. 6 is a cross-sectional view showing a method of joining pipes of the pipe joint, showing a state in which a gap between the push ring and the rear end face of the receiving opening is widened using a spreading jig. FIG. 3 is a perspective view of a spreading jig used in the pipe joining method of the pipe joint. FIG. 6 is a cross-sectional view showing a method of joining pipes of the pipe joint, showing a state in which the spacer is set between the push ring and the rear end face of the receiving port in a state in which the drop-out preventing member is deformed. FIG. 6 is a cross-sectional view showing a method for joining pipes of the same pipe joint, in which one contact surface of the retaining member is expanded and the other contact member is contacted with the pressing wheel, It shows a state where the contact surface of is contacted with the rear end surface of the receiving port. FIG. 6 is a cross-sectional view showing a method of joining pipes of the pipe joint, showing a state in which the insertion port is further inserted into the receiving port and the distal end of the insertion port comes into contact with the rear end face of the receiving port. FIG. 3 is a sectional view of the pipe joint, showing a state in which the insertion port has moved in the removal direction with respect to the receiving port. It is sectional drawing of the conventional pipe joint. FIG. 3 is a partially enlarged sectional view of the pipe joint, showing a state in which a bolt and a connecting rod are embedded in mortar.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As a piping method for a water pipe, a method such as piping inside a shield or adopting a propulsion method is used. As a pipe joint of a ductile iron pipe that can be used for such a pipe in a shield or a propulsion method, the structure of the pipe joint 1 having a separation preventing function shown in FIG. 1 will be described below.

The insertion port 5 of the other tube 4 is inserted into the receiving port 3 of the one tube 2 that is joined to each other, and the tip of the insertion port 5 is in contact with the rear end surface 19 of the receiving port 3. Further, an outer peripheral projection 6 that projects outward in the pipe radial direction 8 is formed over the entire circumference on the outer periphery of the insertion port 5 at a position spaced from the tip of the insertion port 5 in the pipe axis direction 7. In addition, the outer peripheral protrusion 6 is formed by directly forming a protrusion (protrusion) on the outer periphery of the insertion opening 5, or by forming a groove on the outer periphery of the insertion opening 5 and fitting another member into the groove (the protrusion is formed). ) Is formed, or a groove is formed on the outer periphery of the insertion opening 5 so that the portion between the tip of the insertion opening 5 and the groove functions as an outer peripheral projection. Further, it is not limited to these forms.

As shown in FIG. 1 and FIG. 2, on the inner circumference of the receiving port 3, an annular projection 9 that projects inward in the pipe radial direction 8, an annular projection 9 and an opening end 10 of the receiving port 3 are formed. A lock ring accommodating groove 11 located therebetween is formed.

The lock ring accommodating groove 11 accommodates a lock ring 13 that can be fitted onto the insertion opening 5 and a pressing member 14 that presses the lock ring 13 inward 17 in the pipe radial direction. As shown in FIG. 3, the lock ring 13 is a ring-shaped ring having a split structure having a dividing portion 15 at one place, and thereby the diameter of the lock ring 13 can be slightly expanded or contracted.

The pressing member 14 is formed by joining a plurality of plate-shaped (or column-shaped) pressing bodies (not shown) in an annular shape, and between the outer peripheral surface of the lock ring 13 and the bottom surface of the lock ring housing groove 11. It is provided in. The outer peripheral projection 6 is located between the annular projection 9 and the lock ring 13 in the tube axis direction 7, and is engageable with the lock ring 13 in the removal direction 12 of the insertion port 5.

Between the annular projection 9 and the rear end surface 19 of the receiving port 3 in the pipe axis direction 7, and between the inner periphery of the receiving port 3 and the outer periphery of the insertion port 5, an annular accommodation space 25 is entirely formed. It is formed over the circumference. In the accommodation space 25, a seal member 26 that seals between the inner periphery of the receiving port 3 and the outer periphery of the insertion port 5, a push ring 29 that presses the seal member 26 to keep it in a compressed state, and in the pipe axial direction 7 A plurality of spacers 30 that keep the gap between the push ring 29 and the rear end surface 19 of the receiving port 3 at a predetermined gap 31 are housed. The predetermined gap 31 is a regular gap defined by design so that the seal member 26 is compressed to a compression amount required for sealing.

A sealing material pressure contact surface 20 is formed over the entire circumference on the inner circumference of the receiving opening 3 and between the annular projection 9 and the rear end surface 19 of the receiving opening 3 in the pipe axis direction 7. The sealing material pressure contact surface 20 faces the accommodation space 25, and has a taper portion 21 whose diameter decreases from the inner side of the receiving port 3 toward the annular projection 9 and a straight portion which reaches the annular projection 9 from the taper portion 21. 22 and 22.

As shown in FIG. 4, the seal member 26 includes a valve portion 32 made of soft rubber (an example of an elastic body) and having a circular cross section, and a heel portion 33 made of hard rubber (an example of an elastic body) and having a wedge shape in section. It is an annular member having and. One end of the heel portion 33 in the tube axis direction 7 is integrally connected to the valve portion 32. The seal member 26 is inserted into the accommodation space 25 with the valve portion 32 as the tip.

As shown in FIGS. 5 to 9, the push ring 29 is a ring-shaped ring having a split structure having a dividing portion 40 at one location, and thus the push ring 29 can be slightly reduced in diameter. The push wheel 29 is formed on the opposite side of the pressing surface 41 that presses the seal member 26 from the inner side of the receiving opening 3 toward the opening end 10 and the pressing surface 41 in the tube axis direction 7 and is deeper than the receiving opening 3. It has a facing surface 42 facing the end surface 19.

On the facing surface 42, a plurality of fitting portions 43 that are depressed toward the pressing surface 41 are formed. These fitting portions 43 are formed at a predetermined interval 44 in the circumferential direction 35 of the push wheel 29.

As shown in FIGS. 5 to 7 and 12, the spacer 30 is a square plate made of metal, and is sandwiched between the push ring 29 and the rear end surface 19 of the receiving port 3 by the repulsive force of the seal member 26. And is held in the accommodation space 25. At this time, one end of each spacer 30 is fitted into each fitting portion 43, and the other end is in contact with the rear end surface 19 of the receiving port 3. Similar to each fitting portion 43, a plurality of spacers 30 are arranged at a predetermined interval 44 in the pipe circumferential direction 38.

A detachment prevention member 50 that prevents the spacer 30 from detaching is detachably provided in each spacer 30 and accommodated in the accommodation space 25. As shown in FIGS. 5, 6, 10 and 11, the fall prevention member 50 is made of rubber (an example of an elastic body), and has one contact member 51, the other contact member 52, and one contact member 52. It has a connecting portion 53 provided between the contact member 51 and the other contact member 52.

One of the contact members 51 contacts one of the rectangular holes 55 penetrating in the tube axial direction 7, one projecting portion 56 protruding outward in the tube radial direction 8 and one of the contact surfaces 42 of the push ring 29. Contact surface 57 (an example of one contact portion). Similarly, the other contact member 52 also has the other rectangular hole 60 penetrating in the pipe axial direction 7, the other protruding portion 61 protruding outward in the pipe radial direction 8, and the rear end surface of the receiving port 3. It has the other contact surface 62 (an example of the other contact part) which contacts 19. The one contact member 51 and the other contact member 52 have the same shape.

The connecting portion 53 has a pair of flat plate-like inner connecting portions 65 and outer connecting portions 66. The inner connecting portion 65 and the outer connecting portion 66 face each other in the pipe radial direction 8, and an insertion corresponding to the thickness of the spacer 30 is provided between the inner connecting portion 65 and the outer connecting portion 66. A space 67 is formed.

As shown in FIG. 13, the thickness T1 of each of the inner and outer connecting portions 65, 66 in the pipe radial direction 8 is smaller than the thickness T2 of each of the one and the other contact members 51, 52. Further, as shown in FIG. 14, the inner continuous portion 65 and the outer continuous portion 66 are deformable in the U-shape in the pipe radial direction 8 so that they can be expanded and contracted (an example of deformation) in the pipe axial direction 7. ..

As shown in FIG. 12, by inserting the spacer 30 into the one hole 55 of the fall prevention member 50, the insertion space 67 and the other hole 60, the one and the other contact members 51 and 52 are not attached to the spacer 30. When fitted, the fall prevention member 50 is attached to the spacer 30. The one and the other abutting members 51, 52 are slidable with respect to the spacer 30 in the tube axis direction 7.

Further, as shown in FIG. 10, the total length L of the fall prevention member 50 removed from the spacer 30 is slightly longer than the predetermined gap 31 (regular gap defined by design) shown in FIG. ..

Further, as shown in FIGS. 10 and 11, the shape of the inner surface side 69 and the shape of the outer surface side 70 of the fall prevention member 50 in the pipe radial direction 8 are different. That is, as shown in FIG. 10, the outer surface side 70 of the captive prevention member 50 has an uneven shape having the one and the other protrusions 56 and 61. On the other hand, as shown in FIG. The inner surface side 69 has a flat shape without the protrusions 56 and 61.

As shown in FIG. 5, a gap 71 is formed between the outer surface of the fall prevention member 50 in the pipe radial direction 8 and the inner peripheral surface of the receiving port 3, and the fall prevention member 50 in the pipe radial direction 8 is formed. A gap 72 is formed between the inner surface of the and the outer peripheral surface of the insertion port 5.

A method for joining the pipes 2 and 4 of the pipe joint 1 will be described below.

First, as shown in FIG. 15, the push wheel 29 is reduced in diameter and is inserted in this state from the opening end portion 10 of the receiving opening 3 into the receiving opening 3.

Next, the pressing member 14 is housed in the lock ring housing groove 11, and thereafter, an external force is applied to the lock ring 13 to reduce the diameter of the lock ring 13, and in this reduced diameter state, from the opening end portion 10 of the receiving port 3. Fit into the lock ring housing groove 11. At this time, the divided portion 15 of the lock ring 13 is made to face the bottom of the tube. Then, by releasing the external force, the diameter of the lock ring 13 returns to its original state, and the lock ring 13 is housed in the lock ring housing groove 11 with the divided portion 15 facing downward. Thereby, as shown in FIG. 15, the pressing member 14 in the lock ring housing groove 11 is provided between the outer peripheral surface of the lock ring 13 and the bottom surface of the lock ring housing groove 11.

Next, as shown in FIG. 16 and FIG. 17, the shrimp vise 76 is engaged with the opening end portion 10 of the receiving port 3 to expand the diameter of the lock ring 13. At this time, as shown in FIGS. 21 and 22, the diameter of the lock ring 13 is increased until the inner peripheral surface of the lock ring 13 is flush with the inner peripheral surface of the receiving port 3. The shrimp vise 76 is set at a plurality of positions along the circumferential direction of the lock ring 13.

When the lock ring 13 is expanded in diameter by using the shrimp vise 76 in this way, the dividing portion 15 also expands in the circumferential direction accordingly, so that the enlarged dividing portion is shown as shown by the solid line in FIG. 18 and the solid line in FIG. The diameter reduction preventing stopper 77 is fitted into the portion 15. As a result, the diameter reduction of the lock ring 13 is prevented, and the lock ring 13 is kept in the diameter expanded state.

The diameter reduction preventing stopper 77 is formed of a plate-like body as shown in FIG. 20, and integrally has a wide-width fitting body 78 fitted in the dividing portion 15 of the lock ring 13 and an external protruding piece 79. The external projecting piece 79 projects from the position of the lock ring accommodating groove 11 through the gap between the outer circumference of the insertion slot 5 and the inner circumference of the receiving slot 3 to the front outside of the opening end 10 of the receiving slot 3. .. A detachment wire 80 is connected to the external protruding piece 79.

As shown in FIGS. 18 and 19, after setting the diameter reduction preventing stopper 77, all the shrimp vise 76 are removed from the opening end 10 of the receiving port 3. At this time, the detaching wire 80 of the diameter reduction preventing stopper 77 is introduced into the other tube 4 from the receiving side (not shown) opposite to the insertion port 5 of the other tube 4.

Then, as shown by the phantom line in FIG. 19, the insertion port 5 is inserted from the opening end 10 of the receiving port 3 into the receiving port 3. At this time, since the lock ring 13 is kept in a diameter expanded state by the diameter reduction preventing stopper 77, the outer peripheral projection 6 of the insertion port 5 receives the inner side of the lock ring 13 from the opening end 10 side of the receiving port 3. It can pass to the back side of the mouth 3.

At this time, as shown in FIG. 21, the distal end of the insertion slot 5 is stopped at the front side of the rear end surface 19 without reaching the rear end surface 19 of the receiving port 3. As a result, an opening 82 is formed over the entire circumference between the tip of the insertion port 5 and the rear end surface 19 of the receiving port 3.

After that, the seal member 26 is set from the inside of the pipes 2, 4 to the outside of the insertion port 5 in the pipe radial direction 8 through the opening 82, and the sealing material pressure contact surface 20 of the receiving port 3 and the outer periphery of the insertion port 5 are set. Deposit in between. At this time, the push wheel 29 is set between the seal member 26 and the rear end surface 19 of the receiving port 3.

Next, as shown in FIG. 22, by using a plurality of expanding jigs 84, the gap between the push ring 29 and the rear end surface 19 of the receiving port 3 is widened, so that the push ring 29 opens the seal member 26. When pressed, the seal member 26 is pressed between the seal material pressure contact surface 20 of the receiving port 3 and the outer periphery of the insertion port 5 and is kept in a compressed state.

As shown in FIG. 23, the expanding jig 84 has a hydraulic piston cylinder device 86, a bracket 88 is provided at the tip of the piston 87, and a cylinder 89 for receiving the piston 87 in the bracket 88. The guide members 90 are provided on both sides.

A dovetail groove 91 is provided on the side surfaces of the guide member 90 facing each other, and a projection 92 is formed on the side surface of the cylinder 89 so as to be fitted in the dovetail groove 91 and slidably movable in the length direction. The cylinder 89 is configured to reciprocate along the guide member 90 by increasing and decreasing the hydraulic pressure from the communicating pipe 93.

Further, the guide member 90 and the cylinder 89 are provided with claws 94 and 95, which are engaged with the push wheel 29 and the rear end surface 19 of the receiving port 3, respectively. As shown in FIG. 22, when one claw 94 is engaged with the rear end surface 19 of the receiving port 3 and the other claw 95 is engaged with the push ring 29 to supply hydraulic pressure into the cylinder 89, the piston 87 extends from the cylinder 89. Then, the other claw 95 moves with respect to the one claw 94 from the back of the receiving port 3 toward the opening end 10. As a result, the gap between the push ring 29 and the rear end surface 19 of the receiving port 3 is widened, and the push ring 29 presses the seal member 26 from the rear side of the receiving port 3 toward the opening end 10.

The expanding jigs 84 are set at a plurality of positions in the pipe circumferential direction 38, and the plurality of expanding jigs 84 are used to press the push ring 29 as described above.

As shown by the solid line in FIG. 12, the spacer 30 is inserted into the one hole 55, the insertion space 67, and the other hole 60 of the drop-preventing member 50, and the drop-preventing member 50 is attached to the spacer 30. Then, as shown in FIG. 14, one and the other abutting members 51 and 52 of the drop-off preventing member 50 are slid relative to the spacer 30 so as to approach each other, and the one abutting member 51 and the other abutting member. The interval with 52 is reduced. As a result, the inner connecting portion 65 and the outer connecting portion 66 are deformed into a U shape in the pipe radial direction 8, and the one contact member 51 and the other contact member 52 are separated from both end portions of the spacer 30 to the central portion. Sent to.

As shown in FIG. 24, the spacer 30 to which the fall prevention member 50 thus deformed is attached is set from the inside of the pipes 2, 4 through the opening 82 to the outside of the insertion port 5 in the pipe radial direction 8. .. At this time, first, one end of the spacer 30 is fitted into the fitting portion 43 of the push ring 29, and then the other end of the spacer 30 is brought into contact with the rear end surface 19 of the receiving port 3. At this time, the inner connecting portion 65 and the outer connecting portion 66 are deformed, and the one contact member 51 and the other contact member 52 are brought closer to the central portion of the spacer 30, so that the other contact member 51 is contacted. The other end of the spacer 30 contacts the rear end surface 19 of the receiving port 3 in a state where the contact member 52 does not contact the rear end surface 19 of the receiving port 3.

As a result, the spacer 30 to which the fall prevention member 50 is attached can be easily inserted between the push ring 29 and the rear end surface 19 of the receiving port 3, and the expansion jig 84 is not set at a predetermined interval. 44 can be opened and set evenly.

When the spacer 30 is set in this way, the outer connecting portion 66 that has been deformed into a U shape abuts on the inner peripheral surface of the receiving opening 3, and the inner peripheral surface of the receiving opening 3 causes the inner facing surface to face inward in the pipe radial direction 8. Since it is pushed relatively to 17, the inner connecting portion 65 and the outer connecting portion 66 extend in the pipe axis direction 7 from the U-shaped state, and the one contact member 51 and the other contact member 52. The interval between and is expanded.

Further, as shown in FIG. 25, the operator manually expands the distance between the one contact member 51 and the other contact member 52 from the inside of the pipes 2, 4 in the pipe axial direction 7, One of the contact surfaces 57 is surely brought into contact with the facing surface 42 of the push wheel 29, and the other contact surface 62 is brought firmly into contact with the rear end surface 19 of the receiving port 3.

The spacer 30 thus mounted is sandwiched between the push ring 29 and the rear end face 19 of the receiving port 3 by the repulsive force of the seal member 26, and the push ring 29 and the rear end face of the receiving port 3 in the tube axis direction 7 are inserted. A predetermined distance 31 is maintained between the distances 19 and 19.

Next, the expanding jig 84 is removed, and the insertion opening 5 is inserted into the reception opening 3 until the tip of the insertion opening 5 contacts the rear end surface 19 of the reception opening 3 as shown in FIG. As a result, the opening 82 between the tip of the insertion port 5 and the rear end surface 19 of the receiving port 3 is closed, and the accommodation space 25 is formed between the inner periphery of the receiving port 3 and the outer periphery of the insertion port 5. The seal member 26, the push ring 29, the spacer 30, and the fall prevention member 50 are housed in the housing space 25.

At this time, since a gap 72 is formed between the inner surface of the drop-preventing member 50 and the outer peripheral surface of the insertion port 5, the insertion port 5 is inserted into the receiving port 3 when the insertion port 5 is removed. There is no contact with. As a result, the resistance when the insertion port 5 is inserted into the receiving port 3 is reduced, and the required insertion force is reduced.

After that, as shown by the phantom line in FIG. 18 and the phantom line in FIG. 19, the disconnection wire 80 is pulled in the other tube 4 to remove the diameter reduction preventing stopper 77 from the divided portion 15 of the lock ring 13. As a result, as shown in FIG. 1, the lock ring 13 is pressed inward in the pipe radial direction 17 by the pressing member 14, so that the lock ring 13 is reduced in diameter by the elastic force of itself and the pressing force from the pressing member 14 and inserted. Hold around the mouth 5 all around. This completes the work of joining the tubes 2 and 4.

In the joining method of the pipes 2 and 4 as described above, since the shape of the inner surface side 69 and the shape of the outer surface side 70 of the fall prevention member 50 are different as shown in FIGS. As shown in FIG. 5, when the spacer 30 is mounted from the inside of the tubes 2 and 4, it is possible to prevent the fall prevention member 50 from being accidentally attached in the opposite direction in the tube radial direction 8.

Further, since the one contact member 51 and the other contact member 52 of the drop prevention member 50 have the same shape, as shown in FIG. 12, the spacer 30 is inserted into one hole 55 of the drop prevention member 50 and the insertion space. When the fall prevention member 50 is attached to the spacer 30 by inserting it into the 67 and the other hole 60, even if the one contact member 51 and the other contact member 52 are opposite to each other in the tube axis direction 7, there is a problem. There is no.

The operation and effect of the pipe joint 1 of the pipes 2 and 4 joined as described above will be described below.

As shown in FIG. 5, the gap between the push ring 29 and the rear end face 19 of the receiving port 3 in the pipe axis direction 7 is a predetermined gap 31 due to an error in manufacturing each component, an error in joining the pipes 2, 4, and the like. It may fluctuate slightly with respect to the (regular interval defined by the design), and even if the interval between the push ring 29 and the rear end surface 19 of the receiving port 3 becomes slightly larger than the predetermined interval 31, the fall prevention is prevented. The inner contact portion 65 and the outer contact portion 66 (continuous portion 53) of the member 50 extend in the pipe axis direction 7 so that one contact surface 57 surely contacts the facing surface 42 of the push ring 29. At the same time, the other contact surface 62 contacts the rear end surface 19 of the receiving port 3. Further, even if the distance between the push wheel 29 and the rear end surface 19 of the receiving port 3 becomes slightly smaller than the predetermined distance 31, the inner connecting portion 65 and the outer connecting portion 66 are shortened in the pipe axis direction 7. As a result, one contact surface 57 surely contacts the facing surface 42 of the push wheel 29 and the other contact surface 62 contacts the rear end surface 19 of the receiving port 3.

In this way, the inner and outer connecting portions 65, 66 expand and contract in the pipe axis direction 7, so that a slight change in the distance between the push ring 29 and the rear end surface 19 of the receiving port 3 can be absorbed, and the fall prevention can be prevented. It is possible to prevent the position of the member 50 from shifting in the tube axis direction 7.

In addition, when the removal force acts on the insertion slot 5 due to an earthquake or the like, and the insertion slot 5 moves in the removal direction 12 with respect to the receiving opening 3, as shown in FIG. It is possible to prevent the insertion port 5 from being pulled out from the receiving port 3 by engaging with. At this time, the tip of the insertion slot 5 is separated from the rear end surface 19 of the receiving opening 3 in the removal direction 12, and an opening 82 is formed between the front end of the insertion opening 5 and the rear end surface 19 of the receiving opening 3.

At this time, one abutting surface 57 of the fall prevention member 50 abuts on the facing surface 42 of the push ring 29, and the other abutting surface 62 abuts on the rear end surface 19 of the receiving port 3, so that the spacer 30 It is possible to prevent the end from coming off the rear end surface 19 of the receiving port 3 and the spacer 30 from dropping into the inside of the tube 2 through the opening 82 from between the push ring 29 and the rear end surface 19 of the receiving port 3. In this way, by providing the spacer 30 with the drop-off preventing member 50, it is not necessary to embed the spacer 30 inside the mortar material in order to prevent the spacer 30 from falling off, and the labor required for joining the tubes 2 and 4 is reduced. be able to.

In the above embodiment, when joining the pipes 2 and 4, as shown in FIG. 1, the insertion port 5 is inserted into the receiving port 3, and the tip of the insertion port 5 is brought into contact with the rear end surface 19 of the receiving port 3. However, a gap may be formed between the tip of the insertion port 5 and the rear end surface 19 of the receiving port 3.

In the above-described embodiment, when the pipes 2 and 4 are joined, as shown in FIG. 24, the outer continuous portion 66 of the fall prevention member 50 that is deformed into a U shape abuts on the inner peripheral surface of the receiving port 3. 25, the inner connecting portion 65 and the outer connecting portion 66 extend in the pipe axis direction 7 from the U-shaped state, the distance between the one abutting member 51 and the other abutting member 52 is enlarged, and thereafter, FIG. As shown in FIG. 3, the operator manually expands the distance between the one abutting member 51 and the other abutting member 52 in the pipe axis direction 7 so that the one abutting surface 57 faces the pressing wheel 29. 42, and the other contact surface 62 is surely brought into contact with the rear end surface 19 of the receiving port 3. However, the outer continuous portion 66 deformed into a U shape has an inner periphery of the receiving port 3. By contacting the surfaces, the inner connecting portion 65 and the outer connecting portion 66 extend from the U-shaped state in the pipe axial direction 7, and the distance between the one contact member 51 and the other contact member 52 is increased. The contact surface 57 is enlarged in the axial direction 7 so that one contact surface 57 automatically contacts the facing surface 42 of the push ring 29 and the other contact surface 62 contacts the rear end surface 19 of the receiving port 3. Good. In this case, the operator can omit the operation of manually expanding the distance between the one abutting member 51 and the other abutting member 52 in the pipe axis direction 7, so that the work efficiency of joining the pipes 2 and 4 can be improved. improves.

In the above-described embodiment, as shown in FIG. 25, when the spacer 30 is set, one contact surface 57 of the fall prevention member 50 contacts the facing surface 42 of the push ring 29, and the other contact surface 62 receives it. Although it is in contact with the rear end surface 19 of the mouth 3, when the spacer 30 is set, a gap is formed between one contact surface 57 and the facing surface 42 of the push ring 29, and the other contact surface 62 is received. When a gap is formed between the rear end surface 19 of the mouth 3 and the spacer 30 is about to fall off, one contact surface 57 contacts the facing surface 42 of the push ring 29 and the other contact surface 62 contacts the receiver 3. The spacer 30 may be prevented from coming off by making contact with the rear end surface 19 of the.

1 Pipe Joint 2 One Pipe 3 Receiving Port 4 Other Pipe 5 Inserting Port 7 Pipe Axial Direction 8 Pipe Radial Direction 19 Back End Face 25 of Receiving Space 26 Storage Space 29 Sealing Member 29 Push Ring 30 Spacer 38 Pipe Circumferential Direction 44 Predetermined Interval 50 Drop Preventing member 51 One contact member 52 The other contact member 53 Continuous portion 57 One contact surface (one contact portion)
62 Other contact surface (other contact portion)
69 Inner surface side 70 Outer surface side 82 Opening

Claims (6)

A pipe joint for mounting a seal member, a push ring, and a spacer from the inside of the pipe,
The insertion port of the other pipe is inserted into the receiving port of one pipe,
An annular accommodation space is formed between the inner circumference of the receiving opening and the outer circumference of the insertion opening,
A seal member that seals between the receiving opening and the insertion opening in the accommodation space, a push ring that presses the sealing member to keep it in a compressed state, and a spacer that keeps a distance between the push ring and the rear end of the receiving opening in the pipe axis direction. And are housed,
The spacer is sandwiched between the push ring and the rear end of the receiving port and held in the accommodation space.
A pipe joint, characterized in that the spacer is provided with a stopper member for preventing the spacer from falling off and is housed in the housing space. The pipe joint according to claim 1, wherein a plurality of spacers are provided at predetermined intervals in the pipe circumferential direction. The fall prevention member is made of an elastic body, and at least one abutting portion that abuts the push ring when the spacer is about to fall off, and at least the other abutting portion that abuts on the rear end of the receiving port when the spacer is about to fall off. Having a continuous portion provided between one contact portion and the other contact portion,
The pipe joint according to claim 1 or 2, wherein the continuous portion is deformable in the pipe axis direction. One contact portion is provided on one contact member,
The other contact portion is provided on the other contact member,
The connecting portion is provided between one contact member and the other contact member,
4. The pipe joint according to claim 3, wherein the one and the other abutting members are fitted onto the spacer and slidable in the pipe axial direction with respect to the spacer. The pipe joint according to any one of claims 1 to 4, wherein the shape of the fall prevention member in the pipe radial direction is different from the shape on the inner surface side and the shape on the outer surface side. A method for joining pipes using the pipe joint according to claim 4,
With the insertion opening inserted in the receiving opening, an opening is formed between the tip of the insertion opening and the rear end of the receiving opening,
Set the seal member and the push ring from the inside of the pipe to the outside of the insertion port in the pipe radial direction,
With the gap between one of the contact members and the other contact member of the drop prevention member attached to the spacer reduced, the spacer is sandwiched between the push ring and the rear end of the receiving port,
At least one abutting member and the other abutting member of the drop-out preventing member are arranged so that at least one of the abutting portions abuts on the push wheel and the other abutting portion abuts on the rear end of the receiving port at least when the spacer is about to fall off. Widen the space between
By further inserting the insertion opening into the receiving opening and shortening the opening in the tube axis direction, the sealing member, the push ring, and the spacer are inserted into the accommodation space formed between the inner circumference of the receiving opening and the outer circumference of the insertion opening. And a fall-preventing member are housed therein.

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