JP2000291855A - Jig for joining pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a projecting portion of a spigot from being damaged when the spigot having the projecting portion on an outer circumferential into a socket to joint tubes with each other. SOLUTION: The jig for joining tubes with each other comprises a body portion 21 capable of passing in a spigot 9, and a resin sheet 15 provided on a tip of the body portion 21. The resin sheet 15 is arranged so as to be located outside an opening of the spigot 9 before the spigot 9 is inserted in a socket 2, the resin sheet covers the outer surface of the spigot 9 along an inner surface of the socket 2 when the spigot 9 is inserted in the socket 2, and the resin sheet is arranged along the inner surface of the socket 2 when the body portion 21 is passed in a tube 8 and drawn to the side opposite to the spigot 9 after the insertion of the spigot 9 in the socket 2 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for connecting pipes, and more particularly to a jig for connecting pipes by inserting an insertion port into a receiving port to join pipes.

[0002]

2. Description of the Related Art As one type of pipe joint, there is a slip-on type pipe joint. This slip-on type pipe fitting is configured such that a receiving material and a receiving material can be joined by inserting a sealing material into the receiving material while compressing the sealing material into the receiving material. ing. As a slip-on type pipe joint having a detachment prevention function, that is, an earthquake-resistant function, a detachment prevention pipe joint having a configuration shown in FIG. 15 has been proposed.

[0005] That is, in FIG. 15, a receiving port 2 is formed at an end of one of the cast iron pipes 1 to be joined to each other, and a joint portion is formed in a sealing material accommodating groove 3 on the inner periphery of the receiving port 2. An annular rubber sealing material 4 for sealing is arranged. A lock ring housing groove 5 is formed on the back side of the seal material housing groove 3, and a lock ring 6 divided into an appropriate number along the circumferential direction is mounted in the lock ring housing groove 5. Between the outer peripheral side of the lock ring 6 and the inner peripheral side of the lock ring housing groove 5, a holding rubber ring 7 for holding the lock ring 6 in a centered state is arranged.

On the outer periphery of the distal end of the insertion opening 9 of the other cast iron tube 8, a projection 10 is formed which can engage with the lock ring 6 from the back side of the reception opening in order to exhibit a detachment preventing function.
The protruding portion 10 is formed by, for example, welding a ring-shaped member to the outer periphery of the insertion opening 9 and integrating the entire periphery. A tapered surface 11 is formed on the outer periphery of the distal end of the insertion port 9 including the projection 10. Projection 10 and tapered surface 1
Usually, the entire pipe 8 including the coating 1 is coated with a coating for anticorrosion. Also, in particular, in the case where a pipe is cut at a pipe construction site, and then the projection 10 of the insertion opening 9 is welded and the tapered surface 11 is machined at the construction site, the original coating film is peeled off. Therefore, by completely covering the outer periphery of the projection with a heat-shrinkable tube made of resin, complete corrosion protection is achieved.

[0005] In the pipe joint having such a configuration, the socket 2
When the and the insertion port 9 are joined to each other, the insertion port 9 is inserted into the receiving port 2 in a state in which the rubber ring 7, the lock ring 6 and the sealing material 4 are accommodated. Then, the insertion opening 9 becomes the tapered surface 1
The projection 10 pushes and spreads the seal member 4 and the lock ring 6 by the action of 1 and passes through the positions of the seal member 4 and the lock ring 6, and then the projection 10 is located at a position deeper than the lock ring 6. Until it reaches.

[0006]

However, as described above, the insertion opening 9 must be inserted into the receiving opening 2 while the sealing member 4 and the lock ring 6 are pushed and spread by the projections 10. The reaction force from the lock ring 6 at the time may damage the coating film of the protrusion 10 or the heat-shrinkable tube to the iron base. Such damage may cause a decrease in the strength of the protrusion 10 due to corrosion after a long time.

Accordingly, the present invention solves such a problem, and when an insertion port having a projection on the outer periphery is inserted into a receiving port to join pipes to each other, the projection of the insertion port may be damaged. The purpose is to prevent the occurrence of.

[0008]

In order to achieve this object, a jig according to the present invention, which is used when an insertion port is inserted into a receiving port to join pipes to each other, passes through the insertion port. It has a possible body portion and a resin sheet provided at the tip of the body portion, and this resin sheet is arranged so as to be located outside the opening of the insertion port before inserting the insertion port into the receiving port. When the insertion port is inserted into the receiving port, it is configured to cover the outer surface of the receiving port by following the inner surface of the receiving port, and after the insertion of the receiving port into the receiving port is completed, the main body is passed through the pipe. When it is pulled out to the opposite side from the insertion opening, it is configured to be along the inner surface of the insertion opening.

[0009] With this configuration, when the insertion port is inserted into the receptacle at the time of joining the pipes, the resin sheet covers the outer surface of the insertion port along the inner surface of the receptacle, so that the projection of the insertion port is formed. It is prevented that the part comes into contact with the lock ring on the receiving side to cause damage. In addition, the protrusion of the opening does not directly contact the sealing material or the lock ring on the receiving side, and a resin sheet is interposed between the two, so that a large joining force is not required and the opening of the opening is not required. Insertion takes place. After the insertion of the insertion port is completed, the main body is passed through the inside of the pipe on the insertion port side and pulled out to the opposite side of the insertion port, and based on the pulling force, the resin sheet is removed by the inner surface of the insertion port. Since the joint is curved along the inner surface, the joint can be easily removed after the joining is completed.

[0010]

1 and 2 show a first embodiment of the present invention.
1 shows a pipe joining jig 20 of the embodiment. This jig 20
Has a main body 21, a disc-shaped resin sheet 15 provided at one end of the main body 21, and a plurality of spring tongue pieces 22 radially provided at the other end of the main body 21. .
The resin sheet 15 is formed of polyethylene or the like.

The main body 21 is made of a columnar metal material, for example, an aluminum material, and has an inner screw 24 formed at one end and the center of the other end. A cap 25 made of a disc-shaped aluminum material or the like is attached to one end and the other end of the main body 21. That is,
These caps 25 pass through through holes 26 at the center of the caps 25 and
4, the main body 21 is
At one end and the other end. And the main body 2
1 and one end of the main body 21 as described above.
The resin sheet 15 and the spring tongue piece 22 are sandwiched and fixed between the cap 25 and the cap 25 fixed to the cap 25.

FIGS. 3 and 4 show a pipe joining jig 40 according to a second embodiment of the present invention. In the jig 40, at one end of the main body 21, the resin sheet 15 and the spring tongue 23 having the same configuration as the spring tongue 22 are arranged in an overlapping state, and are fastened together by the cap 25 and the eyebolt 27. ing. The spring tongue 23 is provided on the tip side, that is, on the front side of the resin sheet 15. Other configurations of the jig 40 are the same as those of the jig 20.

As shown in FIGS. 5 and 7, a pair of spring tongues 22, 23 arranged at a distance of 180 degrees are
It is integrally formed by one elongated spring plate 30. The spring plate 30 is formed of a thin, highly springy material, and has a large hole 31 at the center thereof.
The small hole 32 is provided on both sides of the large hole 31. Further, chamfered portions 29 are formed at both end portions, that is, at the tip portions of the spring tongue pieces 22 and 22.

FIG. 5 shows the resin sheet 1 on one end of the main body 21.
5 and 6 show a configuration of a jig 40 in which the spring tongue piece 23 and the spring tongue piece 23 are fastened together. As shown in FIGS. , A plurality of columnar protrusions 33 are formed at a constant pitch in the circumferential direction. These projections 33 can be formed by, for example, headless small screws screwed into the main body 21. This cap 25
A recess 34 is formed in which the projection 33 fits when the is attached to the main body 21. In the resin sheet 15, a large hole corresponding to the internal screw 24 and a plurality of small holes in the circumferential direction corresponding to the protrusion 33 are formed in a penetrating state. Then, the resin sheet 15 is arranged along the end face of the main body 21.

Then, as shown in FIG.
When a plurality of spring plates 30 are arranged in the circumferential direction so that all the protrusions 33 pass through the small holes 323 of the spring plate 30 as shown in the drawing, the main body A plurality of thin spring plates 3 at the end face 21;
As shown in the drawing, the spring tongue pieces 22 and 23 are radially arranged in a state where the zeros overlap and the large holes 31 are aligned with the internal screw 24 of the main body 21. And
When the cap 25 is placed on the main body 21 in this state, the tip of the projection 33 fits into the concave portion 34, and the inner screw 24 of the main body 21, the large hole of the resin sheet 15, the large hole 31 of the spring plate 30, and the cap 25 In a state where the through holes 26 match,
The resin sheet 15 and the plurality of spring plates 30 are sandwiched between the main body 21 and the cap 25.

Then, by tightening the eyebolt 27 in this state, the resin sheet 15 and the plurality of radial spring tongue pieces 23 are attached to the main body 2 as shown in FIGS.
1 will be fixed to one end. At the other end of the main body 21, the spring tongue 22 is fixed in the same manner. The resin sheet 15 is configured to be freely bendable. The spring tongue pieces 22 and 23 are also formed of a thin material having high spring properties as described above, so that they can be elastically bent in the direction of their thickness. One eyebolt 27 has a cord 35
Is tied.

As shown in FIG. 1 and FIG.
When only the resin sheet 15 is provided at one end without the spring tongue 23, the resin sheet 15 may be simply sandwiched between the cap 25 and the main body 21. Therefore, it is not necessary to provide the concave portion 34 of the cap 25 and especially the protrusion 33 of the main body 21. Next, a method of joining the socket 2 and the insertion port 9 of the pipe joint shown in FIG. 15 will be described by taking the jig 20 shown in FIGS. 1 and 2 as an example.

First, as shown in FIG. 8, the main body 21 of the jig 20 is inserted into the cast iron tube 8 through the opening of the insertion port 9 having the projection 10 together with the string body 35 and the spring tongue piece 22. insert. Then, the plurality of spring tongue pieces 22 are elastically deformed in a curved shape by the inner surface of the insertion port 9, and the main body 21 is held in a state of being centered with respect to the insertion port 9. At this time, similarly, the resin sheet 15 is held in a centered state with respect to the insertion opening 9. The cord 35 passes through the inside of the tube 8 and reaches the opening at the end opposite to the insertion opening 9.
As shown in the drawing, the resin sheet 15 is formed such that the diameter of a circle formed by the tip thereof is larger than the diameter of the tube 8, and thus allows the main body 21 to enter the insertion opening 9. In this state, the central portion of the resin sheet 15 is configured to be able to approach or contact the end face of the insertion opening 9.

Next, as shown in FIG. 9, the opening 9 of the pipe 1 in which the lock ring 6 and the sealing material 4 are set in advance is inserted into the insertion port 9 on which the jig 20 is mounted. Then, it is inserted into the receptacle 2. Then, as shown in the figure, the diameter of the circle formed by the distal end of the resin sheet 15 is larger than the diameter of the receiving port 2, and therefore, the resin sheet 15 is formed inside the receiving port 2, for example, inside the sealing material 4. The peripheral edge of the peripheral portion is elastically deformed in a curved shape along the outer shape of the insertion opening 9. That is, a portion on the peripheral edge side of the resin sheet 15 is stuck to the outer surface of the insertion opening 9, particularly the outer surface of the protrusion 10.

When the insertion slot 9 is further inserted in this state,
The projecting portion 10 with the resin sheet 15 stuck thereto, that is, the insertion opening 9, pushes and spreads the sealing material 4 as shown in FIG. 10, and then pushes and spreads the lock ring 6 as shown in FIG. 4 and the inner circumference of the lock ring 6. At this time, as described above, since the resin sheet 15 covers the outer surface of the insertion opening 9, particularly the outer surface of the projection 10, the projection 10 is prevented from coming into contact with the lock ring 6 on the receiving port 2 side, thereby preventing scratches. it can. Similarly, it is possible to prevent the projection 10 from damaging the inner peripheral surface of the sealing material 4 during joining. In addition, since the protrusion 10 of the insertion port 9 does not directly contact the sealing material 4 or the lock ring 6 on the receiving port 2 side, and the resin sheet 15 is interposed between the two, a large bonding force is required. The opening 9 can be inserted without any trouble. FIG. 12 shows a state in which the joining is completed. In this state, not only the protrusion 10 of the insertion opening 8 but also the peripheral edge of the resin sheet 15 has finished passing through the inner periphery of the lock ring 6.

Next, the jig 20 is removed from the joint. At that time, as shown in FIG. 13, the cord body 35 is pulled using the opening at the end of the tube 8 opposite to the insertion opening 9. Then, the resin sheet 15 is gradually drawn into the insertion opening 9 from the center side, and finally, as shown in the figure, the resin sheet 15 has its peripheral edge inserted similarly to the first spring tongue piece 22. It is elastically deformed along the inner surface of the cast iron tube 8 toward the opening of the opening 9.

When the cord 35 is continuously pulled in the state shown in FIG. 13, the jig 20 is taken out of the tube 8 from the opening at the end opposite to the insertion port 9, and The extraction is completed. At this time, as described above, the spring tongue piece 22 and the resin sheet 15 are elastically deformed along the inner surface of the cast iron pipe 8, and the main body 21 is thereby centered with respect to the cast iron pipe 8. Therefore, the pulling out can be easily performed. Further, since the chamfered portion 29 is formed at the tip of the spring tongue piece 22, when the spring tongue piece 22 moves along the inner surface of the insertion hole 9, the lining of the inner surface of the insertion hole 9 is damaged. Is prevented.

Since the spring tongue 22 and the resin sheet 15 are fixed by tightening the eyebolts 27, when the thin spring tongue 22 and the resin sheet 15 are plastically deformed, they can be easily replaced. Can be. Further, in the above description, the case where the detachment prevention pipe joint composed of the pipe 8 having the protrusion 10 is joined to the outer periphery of the insertion opening 9 has been described. It is also applicable to ordinary slip-on type pipe joints having no function and other pipe joints.

In the above, the construction method using the jig 20 having only the resin sheet 15 shown in FIGS. 1 and 2 has been described. However, the resin sheet 15 and the spring tongue shown in FIGS. A construction having both the pieces 23 can be similarly constructed. In particular, when the spring tongue 23 is provided, when the spring tongue 23 and the resin sheet 15 pass through the inner periphery of the sealing member 4 and the lock ring 6 on the receiving port 2 side, substantially. Only the spring tongue piece 23 comes into contact with the sealing material 4 and the lock ring 6, and the contact area is reduced, so that the joining force can be greatly reduced.

As shown in FIGS. 9 to 11, the resin sheet 15 has a disk shape as described above so that its peripheral side can be easily elastically deformed in a curved shape so as to follow the outer shape of the insertion opening 9. Instead of forming it in a shape, it can be formed in advance in a cap shape corresponding to this deformation direction. Spring tongue 2
3 is the same. In addition, a plurality of resin sheets 15 can be used in an overlapping manner.

FIG. 14 shows still another embodiment of the present invention. Here, as the jig 60, the main body 21 described above is used.
In contrast to the one having the spring tongue piece 22 for centering, the one provided with the centering member 36 is shown. The centering member 36 is formed in a columnar or cylindrical shape with a resin or the like, and is formed such that its outer diameter is slightly smaller than the inner diameter of the insertion opening 9. Therefore, when the centering member 36 is inserted into the insertion port 9, the jig 60 is centered with respect to the insertion port 9. A center axis 37 in the axial direction is connected to the center of the centering member 36, and an external thread 38 formed at the tip of the center axis 36 penetrates the center of the resin sheet 15. The resin sheet 15 is sandwiched and fixed between a pair of backing plates 39 which are fastened by using the above.

It is of course possible to center the jig by other means.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the pipe joint shown in FIG. 15, when the diameter of a pipe is 100 mm, a standard outer diameter of a projection formed on the outer periphery of the insertion opening is 124.5 mm. Also,
When having the maximum tolerance, the outer diameter of the projection is 125.5 m
m. Therefore, the outer diameter of this projection is the standard 124.5.
125 mm, which corresponds to the maximum tolerance.
(1) a jig using only one resin sheet, (2) a jig using two resin sheets stacked, and (3) a jig using the resin sheet in the circumferential direction. A joining test was performed using a jig which was used by overlapping the spring tongue pieces at the locations. For comparison, a test was also performed in which the insertion port was directly inserted into the receptacle without using a jig.

The opening used had an outer periphery of the projection covered with a heat-shrinkable tube made of resin. The lock ring is formed in one piece in the circumferential direction.
The thing which formed the thin part which stole the meat of the inner peripheral side in three positions along the circumferential direction was used. That is, in this lock ring, non-smooth edge portions were formed at a total of eight places, both ends of each thin portion and both ends of the circumferentially divided portion.

As a result, the outer diameter of the projection is the standard 124.5.
In the case of mm, in any of the cases (1), (2) and (3), no breakage occurred in the heat-shrinkable tube. On the other hand, when the jig of the present invention was not used, tearing occurred at five places along the circumferential direction of the heat-shrinkable tube, and the maximum size of the tearing was 12 × 14 mm. In the case where the outer diameter of the protrusion is 125.5 mm corresponding to the maximum tolerance, breakage occurs in the case of (1) and the size is 7 × 10 mm, but in the case of (2) and (3), No tears occurred.
On the other hand, when the jig of the present invention was not used, tears occurred at seven locations along the circumferential direction of the heat-shrinkable tube, and the maximum size of the tear was 13 × 11 mm.

[0031]

As described above, according to the present invention, there is provided a main body which can pass through the opening, and a resin sheet provided at the tip of the main body. Before insertion into the socket, it is arranged so as to be located outside the opening of the socket, and when inserting the socket into the socket, it is configured to cover the outer surface of the socket by following the inner surface of the socket, and to the socket After the insertion of the insertion port is completed, the main body is passed through the pipe and pulled out to the side opposite to the insertion port so that it is configured to be along the inner surface of the insertion port. When the mouth is inserted into the receptacle, since the resin sheet covers the outer surface of the receptacle along the inner surface of the receptacle, the protrusion of the receptacle comes into contact with the lock ring on the receptacle side, causing damage. Can be prevented.
In addition, since the protrusion of the opening does not directly contact the sealing material or the lock ring on the receiving side, and the resin sheet is interposed between the two, the insertion is performed without requiring a large joining force. Can be inserted. After the insertion of the insertion port is completed, the main body is passed through the inside of the pipe on the insertion port side and pulled out to the opposite side of the insertion port, and based on the pulling force, the resin sheet is removed by the inner surface of the insertion port. Since the joint is curved along the inner surface, the joint can be easily removed after the joining is completed.

[Brief description of the drawings]

FIG. 1 is a front view and a side view of a jig for joining a pipe according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the jig of FIG.

FIG. 3 is a front view and a side view of a pipe joining jig according to a second embodiment of the present invention.

FIG. 4 is a perspective view of the jig of FIG. 3;

FIG. 5 is an exploded perspective view of the jig of FIGS. 3 and 4.

FIG. 6 is a perspective view of a main body and a cap in the jig of FIGS. 3 to 5;

FIG. 7 is a perspective view of a spring plate in the jig of FIGS.

FIG. 8 is a view for explaining a pipe joining operation using the jig of the present invention.

FIG. 9 is a diagram showing a next working stage of FIG. 8;

FIG. 10 is a view showing a next working stage of FIG. 9;

FIG. 11 is a diagram showing a next operation stage of FIG. 10;

FIG. 12 is a diagram showing a work stage at the time of completing the next joining of FIG. 11;

FIG. 13 is a view showing a work stage for removing the jig next to FIG. 12;

FIG. 14 is a view showing a jig for joining pipes according to still another embodiment of the present invention.

FIG. 15 is a diagram illustrating a pipe joint that can be joined using the jig of the present invention.

[Explanation of symbols]

 2 Socket 9 Insert 15 Resin sheet 21 Main part

Claims (1)

[Claims] 1. A jig used when an insertion port is inserted into a receiving port to join pipes to each other, the jig being provided at a tip end of the main body section which can pass through the insertion port. Before the insertion of the opening into the receptacle, the resin sheet is disposed so as to be located outside the opening of the insertion opening, and when the insertion opening is inserted into the reception opening, the inner surface of the reception opening is provided. After the insertion of the insertion port into the receptacle is completed, the main body is passed through the tube and pulled out to the opposite side from the insertion port after the insertion of the insertion port into the receptacle has been completed. A jig for joining pipes, wherein the jig is configured to extend along an inner surface.