JP2003240170A - Handling method of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize a diameter expanding state of a lock ring in a piping execution field and to easily and speedily insert an insert hole into a socket. <P>SOLUTION: The lock ring 6 is stored in a lock ring storing groove 4 as advance work of pipe joining work. A dividing part 6a of the lock ring 6 is engaged with a centering spacer 23 recoverable from an opening side of the socket 2 to the outside of the socket 2 through a clearance between the socket 2 and the insert hole 11 after the lock ring 6 is kept in a diameter expanding state and the insert hole 11 is inserted into the socket 2. The pipe is carried into the piping execution field in a state where the centering spacer 23 is engaged with the dividing part 6a of the lock ring 6 to expand the diameter of the lock ring 6. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method of handling a pipe.

[0002]

2. Description of the Related Art Conventionally, there is a joint structure as shown in FIG. 6 as one of the joint structures for a pipe having an earthquake resistance function.

As shown in FIG. 6, a receiving port 2 is formed at the end of one of the pipes 1, and a rear end face 3 is formed at the back side of the receiving port 2. A lock ring accommodating groove 4 is formed on the opening side of the receiving port 2 with respect to the inner end surface 3, and a rubber ring 5 for centering the lock ring is formed in the lock ring accommodating groove 4.
The ring-shaped lock ring 6 having one divided portion 6a in the circumferential direction is housed via the.

A taper surface 7 that widens toward the opening side is formed on the opening side further than the lock ring receiving groove 4. A flange 8 is formed on the outer circumference of the end of the receiving port 2 toward the outside in the radial direction, and a plurality of round holes 9 extending in the pipe axis direction are penetrated through the flange 8 at regular intervals in the circumferential direction. Is formed by.

On the other hand, an insertion port 11 is formed at the end of the other tube 10, and an insertion port projection 12 is formed on the outer periphery of the tip of this insertion port 11. A taper surface 13 is formed on the outer periphery of the tip of the insertion protrusion 12. Note that the insertion port 11
Is inserted into the receiving opening 2 until the insertion opening projection 12 is located between the lock ring 6 and the rear end surface 3, and the insertion opening projection 12
The outer diameter of is larger than the inner diameter of the lock ring 6.

A backup ring 14 and a rubber-made sealing material 15 which are divided in the circumferential direction are arranged on the outer periphery of the insertion port 11 on the opening side of the position of the lock ring 6. Further, the outer periphery of the portion of the insertion opening 11 that does not enter the receiving opening 2 has the same outer diameter as the flange 8, and the sealing material 15
An annular push wheel 16 capable of pushing is arranged.

Round holes 17 corresponding to a plurality of round holes 9 formed in the flange 8 are formed in the push ring 16 in a penetrating state. A T-shaped bolt 18 is passed through the round hole 9 in the flange 8 and the round hole 17 in the push ring 16, and a nut 19 is screwed onto the T-shaped bolt 18.
The pressing force of the T-shaped bolt 18 and the nut 19 pushes the push ring 16 in the axial direction of the pipe, presses the seal material 15 and the backup ring 14 arranged on the outer circumference of the insertion port 11, and forms the receiving port 2. The sealing material 15 is pressed against the tapered surface 7 that is formed. As a result, a sealing function is added to this pipe joint.

When a compressive force acts on the pipe joint in the axial direction of the pipe due to an earthquake or the like, the insertion projection 12 is locked by the lock ring 6.
It is possible to move from the position of to the back end surface 3 of the receiving port 2. In addition, when a tensile force is applied, the insertion protrusion 12 engages with the lock ring 6 from the back side of the receiving port 2 and the receiving port 2
It is possible to reliably prevent the insertion opening 11 from coming out of the opening. In this way, a seismic function is added to the joint portion of the pipe.

A method of joining one pipe 1 and the other pipe 10 to form the above-mentioned joint portion of the pipe will be described with reference to FIGS. 7 to 10. Generally, a pipe having a receiving port 2 is carried into a piping construction site in a state where a rubber ring 5 and a lock ring 6 are stored in a lock ring receiving groove 4 in the receiving port 2, as shown in FIG. 7. Therefore, in the pipe joining operation, as shown in FIG. 8, the tip end of the scissor-shaped lock ring expander 20 is inserted into the split portion 6a of the lock ring 6, and one of the lock ring expanders 20 is inserted. Handle 2
0a is screwed into the screw hole 20b, for example, a T-shaped bolt 21 is rotated to gradually expand the lock ring 6 while compressing the rubber ring 5 while opening the lock ring expander 20. . At this time, the inner diameter of the lock ring 6 is expanded so as to be larger than the outer diameter of the insertion protrusion 12. Depending on the structure of the pipe joint, the rubber ring 5
May not be required, and in this case, the rubber ring 5 need not be housed in the lock ring housing groove 4.

When the lock ring 6 is expanded to a predetermined diameter, in order to maintain the lock ring 6 in this state, as shown in FIG.
And a spacer 22 as shown in FIG. 10 is used.
As shown in FIGS. 9 and 10, the spacer 22 can be inserted into the divided portion 6a of the thin lock plate 6 (shown in phantom line) in the expanded state, and the end face 6c of the lock ring 6 in the circumferential direction can be inserted. , 6c, and an arm portion 22b which is a thin plate continuous with the insertion portion 22a, is arranged along the inner surface of the receiving port 2 and is curved according to the inner surface shape, A thin plate-shaped connecting portion 22d that is continuous with the arm portion 22b and extends in the radial direction along the end surface of the receiving port 2 and an outer peripheral engaging portion that is continuous with the connecting portion 22d and that can engage with the outer periphery of the flange 8 in the receiving port 2 22c is integrally formed. The insertion portion 22a is inclined radially outward with respect to the arm portion 22b so that the insertion portion 22a can be reliably inserted into the divided portion 6a of the lock ring 6 in the expanded diameter state.

The insertion portion 22a of the spacer 22 having such a structure is divided into the divided portions 6a of the lock ring 6 in the expanded state.
Then, the spacer 22 is attached to the receiving opening 2 by inserting it so as not to interfere with the lock ring expanding tool 20 and engaging the outer peripheral engaging portion 22c with the outer periphery of the flange 8 of the receiving opening 2. Then, the lock ring expander 20 is removed from the split portion 6a of the lock ring 6. It should be noted that FIG. 10 shows a state in which the lock ring expander 20 has already been removed.

The lock ring expander 20 is attached to the lock ring 6
When removed from the divided portion 6a, the insertion opening 11 in which the backup ring 14, the seal material 15 and the push ring 16 are already arranged on the outer periphery is inserted into the receiving opening 2. At this time, the insertion protrusion 12
However, the inside of the expanded lock ring 6
The insertion opening 11 can be easily inserted into the receiving opening 2 until the insertion opening projection 12 is positioned between the lock ring 6 and the rear end surface 3 of the receiving opening 2. be able to.

When the insertion of the insertion port 11 is completed, the spacer 22 is pulled out from the opening side of the receiving port 2 and collected to eliminate the expanded state of the lock ring 6. After that, although not shown, the backup ring 14, the sealing material 15 and the push ring 1
6 is moved to a predetermined position on the outer periphery of the insertion port 11 and T is inserted into the round hole 9 in the flange 8 and the round hole 17 in the push ring 16.
The V-shaped bolt 18 is passed through, the nut 19 is screwed onto the T-shaped bolt 18 to seal the joint portion, and the pipe joining operation is completed.

[0014]

In the case of the pipe joining method described in the prior art, one pipe 1 and the other pipe 1 are connected.
The process of expanding the diameter of the lock ring 6 accommodated in the lock ring accommodating groove 4 by the lock ring expander 20 at the pipe construction site before joining 0 and the lock ring 6 in the expanded state. A spacer 22 on the divided portion 6a of
It is necessary to perform the two steps, i.e., the step of inserting the insertion portion 22a of the above, and the step of engaging the outer peripheral engagement portion 22c with the outer periphery of the flange 8 to attach the spacer 22 to the receiving port 2.

However, since it takes a certain amount of time to perform the above two steps at the piping construction site,
There is a problem that it takes a long time to start the pipe joining work, and the whole work takes a long time.

Further, as shown in FIG.
In the above, since the thin plate-shaped insertion portion 22a is the only portion that directly engages the circumferential end faces 6c, 6c of the lock ring 6 to maintain the expanded state of the lock ring 6, the lock ring expander 20 is removed. There was also a problem that the stability of the expanded state of the lock ring 6 later was not always sufficient.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve such a problem, to stabilize the expanded state of the lock ring at the piping construction site, and to insert the insertion opening into the receiving opening easily and quickly.

[0018]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a lock ring receiving groove is formed in the inner periphery of the receiving opening of one of the pipes, and the lock ring receiving groove is formed. A ring-shaped lock ring having a divided portion in the circumferential direction is housed therein, and an insertion port projection is formed on the outer periphery of the insertion port of the other pipe, and the locking ring is expanded inside. When the one pipe and the other pipe are to be joined by inserting the insertion port into the receiving port by passing through the insertion port protrusion, as a pre-operation of the pipe joining work, the lock ring accommodation The lock ring is accommodated in the groove, the divided part of the lock ring is maintained in the expanded state of the accommodated lock ring, and the receiving port and the insertion port are inserted after the insertion port is inserted into the receiving port. Through the gap between your mouth By fitting a spacer that can be collected from the opening side of the receiving opening to the outside of the receiving opening, and the spacer is fitted to the dividing portion of the lock ring so that the lock ring is expanded in diameter. The pipe is brought into the pipe construction site.

According to such a construction, as a pre-operation for joining the pipes, the lock ring accommodated in the lock ring accommodating groove is expanded, and the lock ring is attached to the divided portion of the lock ring. After keeping the diameter expanded and inserting the insertion slot into the receiving slot, fit a recoverable spacer from the opening side of the receiving slot to the outside of the receiving slot through the gap between the receiving slot and the insertion slot, and attach the spacer to the lock ring. By loading one of the pipes to the pipe construction site while it is installed, it is not necessary to expand the lock ring to join the pipes at the pipe construction site. Then, it is only necessary to collect the spacer. Therefore, the insertion opening can be easily and quickly inserted into the receiving opening, and it is possible to prevent the pipe joining operation from being lengthened as a whole.

According to the second aspect of the present invention, the lock ring accommodating groove is formed on the inner circumference of the receiving opening of one of the pipes,
An annular lock ring having a divided portion in the circumferential direction is accommodated in the lock ring accommodating groove, and an insertion opening projection is formed on the outer circumference of the insertion opening in the other pipe, and the diameter is expanded. A handling method for a pipe in which the one pipe and the other pipe are joined by passing the insertion port projection inside the lock ring and inserting the insertion port into the receiving port. , The lock ring receiving groove in the receiving port of the one of the pipes that is brought into the pipe construction site and is waiting to be joined to the other pipe, accommodates the lock ring, and in the dividing portion of the lock ring, After keeping the housed lock ring in a diameter-expanded state and inserting the insertion opening into the receiving opening, the locking ring is inserted from the opening side of the receiving opening through the gap between the receiving opening and the insertion opening. A spacer that can be collected to the outside It is intended to match.

According to such a construction, at the pipe construction site, the spacer is attached to the receiving opening of the pipe in the joining waiting state, so that when the pipes are joined, the insertion opening is inserted into the receiving opening, and the insertion opening is inserted. All that is required later is to retrieve the spacer from the receptacle. Therefore, the time required for the entire pipe joining operation can be significantly reduced.

According to the third aspect of the present invention, the diameter of the annular lock ring, which is accommodated in the lock ring accommodating groove formed in the inner periphery of the receiving opening of one of the pipes and has a circumferentially divided portion, is expanded, By inserting the insertion opening into the receiving opening by passing through an insertion opening projection formed on the outer periphery of the insertion opening in the other pipe inside the lock ring, the one pipe and the other pipe A spacer for maintaining the expanded diameter state of the lock ring when joining is engageable with the inner peripheral surface around the split portion of the lock ring whose diameter is expanded while being accommodated in the lock ring accommodation groove. Inner surface support portion, a diameter reduction preventing portion formed on the inner surface support portion and capable of engaging with both end surfaces in the circumferential direction of the expanded ring, and an outer periphery capable of engaging with the outer circumference of the receiving port. An engaging portion, The inner surface supporting portion and the outer peripheral engaging portion and a connecting portion for connecting the outer peripheral engaging portion, and, after the insertion opening is inserted into the receiving opening, through the gap between the receiving opening and the insertion opening of the receiving opening It can be collected from the opening side to the outside of the receiving port.

With this structure, the lock ring can be maintained in the expanded diameter state by the diameter reduction prevention portion engaging with both circumferential end faces of the expanded diameter lock ring. Moreover, since the inner surface support portion engages with the inner peripheral surface around the divided portion of the lock ring, the lock ring kept in the expanded state by the diameter reduction prevention portion is displaced in the pipe radial direction with respect to the spacer. It is possible to prevent and stabilize the expanded state of the lock ring. Further, since the outer peripheral engagement portion of the spacer engages with the outer periphery of the receiving port, it is possible to prevent the spacer and the lock ring from being displaced in the pipe radial direction with respect to the receiving port. Can be further stabilized. further,
If the distance between the inner surface support portion and the outer peripheral engagement portion in the pipe radial direction is set to a predetermined dimension, the lock ring can be centered with respect to the pipe shaft.

According to a fourth aspect of the present invention, the diameter of an annular lock ring, which is housed in a lock ring housing groove formed in the inner circumference of the receiving opening of one of the pipes and has a circumferentially divided portion, is expanded, By inserting the insertion opening into the receiving opening by passing through an insertion opening projection formed on the outer periphery of the insertion opening in the other pipe inside the lock ring, the one pipe and the other pipe Is a spacer for maintaining the expanded state of the lock ring when joining, the end of the lock ring in the circumferential direction, on the opening side of the receiving opening in the lock ring along the axial direction. A groove portion reaching the end face is formed, and the spacer is an insert portion that can be inserted into a split portion of the lock ring in a diameter-expanded state, and is formed in the circumferential direction from the insertion portion, and is provided in the lock ring in the diameter-expanded state. Oke And the projection can be fitted into the groove, and the outer engaging portion capable involvement on the outer periphery of the receptacle,
The receiving end having a connecting portion connecting the end face locking portion and the outer peripheral engaging portion, and passing through a gap between the receiving opening and the insertion opening after the insertion opening is inserted into the receiving opening. It is configured such that it can be collected from the opening side to the outside of the receiving port.

According to this structure, the protrusion formed in the circumferential direction from the insertion portion fits into the groove formed in the end portion of the lock ring in the circumferential direction, so that the diameter is expanded by the insertion portion. It is possible to prevent the lock ring maintained in the state from being displaced in the pipe radial direction with respect to the spacer, and reliably stabilize the expanded state of the lock ring.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION A pipe handling method according to an embodiment of the present invention will be described with reference to FIGS. In the embodiment, the same parts as those already described in the conventional pipe joint structure are designated by the same reference numerals as those used in FIG. 6, and the detailed description thereof will be omitted.

As shown in FIG. 3, a centering spacer 23 which is a spacer used in the embodiment of the present invention.
Is an inner surface support portion 23b having a portion capable of supporting the inner peripheral surface 6b around the divided portion 6a in the lock ring 6 (indicated by an imaginary line) which is formed in a thin plate shape and has an enlarged diameter, and the inner surface support portion 23b. Projections 23a and 23a which are integrally formed on the lock ring 6 and can engage with the end faces 6c and 6c in the circumferential direction of the lock ring 6, and the flange 8 of the receptacle 2.
And an outer peripheral engaging portion 23c that can engage with the outer periphery of the inner peripheral surface of the inner peripheral surface of the inner peripheral surface of the inner peripheral surface of the inner peripheral surface of the outer peripheral engaging portion 23c. In addition,
An inclined surface 23e is formed on the connecting portion 23d side of the protrusion 23a.

As a tube handling method using the centering spacer 23 having such a structure, first, as in the method described in the prior art, the lock ring 6 housed in the receptacle 2 is shown in FIG. The diameter is expanded using such a lock ring diameter expander 20 (diameter expansion step).

As shown in FIGS. 1 and 2, the projections 23a and 23a of the centering spacer 23 are attached to the split portion 6a of the lock ring 6 in the expanded diameter state by the lock ring expanding tool 20 (not shown). The protrusions 23a are brought into contact with the respective end faces 6c to maintain the lock ring 6 in a diameter expanded state, and the inner peripheral surface 6b of the lock ring 6 is provided with an inner surface support portion. 23b is engaged, and the lock ring expander 20 is removed. At this time, the outer peripheral engagement portion 23c is engaged with the outer periphery of the flange 8 of the receiving port 2, and the centering spacer 23 is attached to the receiving port 2.
Attach to (attachment process).

The inner surface support portion 23b engages with the inner peripheral surface 6b around the divided portion 6a of the lock ring 6, so that the lock ring 6 which is maintained in the expanded state by the protrusion 6a with respect to the centering spacer 23. The lock ring 6 can be supported in the pipe radial direction and the expanded state of the lock ring 6 can be stabilized. Further, since the outer peripheral engagement portion 23c of the centering spacer 23 engages with the outer periphery of the flange 8 of the receiving port 2, the centering spacer 23 and the lock ring 6 are displaced in the pipe radial direction with respect to the receiving port 2. Because you can prevent
The expanded diameter state of the lock ring 6 can be further stabilized.

At this time, as shown in FIG. 1, the distance between the inner surface supporting portion 23b and the outer peripheral engaging portion 23c in the pipe radial direction, that is, the length of the connecting portion 23d in the centering spacer 23 in the pipe radial direction is set to a predetermined dimension. If L is set, the lock ring 6 in the expanded diameter state can be centered with respect to the pipe axis, and the pipe joining work can be performed more efficiently.

In the pipe handling method of the present invention, such a diameter expanding process and a mounting process are performed in advance as a pre-work for pipe joining work, for example, in a pipe manufacturing factory.
Then, the pipe in the state where the lock ring 6 is expanded, that is, the state where the centering spacer 23 is attached to the receiving port 2 is shipped and carried into the pipe construction site.

As a result, as a pipe joining operation at the piping construction site, the insertion port 11 is inserted into the receiving port 2, and after the insertion port 11 is inserted into the receiving port 2, the receiving port 2 and the insertion port 11 are joined together. It is only necessary to collect the centering spacer 23 from the opening side of the receiving port 2 to the outside of the receiving port 2 through the gap. Moreover, the protrusion 23a
Since the inclined surface 23e is formed on the side of the connection portion 23d in the above, when the centering spacer 23 is pulled out from the opening side of the receiving port 2 and collected, the protrusion 23a is caught on the edge of the lock ring housing groove 4. Can be prevented, and the centering spacer 23 can be easily removed.

Therefore, by omitting the diameter expansion process and the mounting process, which originally had to be performed at the piping construction site, the insertion port 11 can be easily and quickly inserted into the receiving port 2, It is possible to prevent a long time as a whole of the joining work.

Further, instead of the centering spacer 23 shown in FIGS. 1 to 3, the centering spacer 2 shown in FIGS. 4 and 5 is used.
It is also possible to use 4. As shown in FIGS. 4 and 5 (a), the centering spacer 24 includes an end face locking portion 24a, which is an insertion portion that can be inserted into the split portion 6a of the expanded lock ring 6, and the end face locking portion. It has a projecting portion 24b formed by projecting in the circumferential direction from 24a and an outer peripheral engaging portion 24c capable of engaging with the outer periphery of the flange of the receiving port 2, and the end face locking portion 24a and the outer peripheral engaging portion. 24c is integrally formed via a connecting portion 24d in the radial direction.

A circumferential end face 24e of the end face locking portion 24a,
On the tip end side of 24e, the end face locking portion 24a has the lock ring 6
When the lock ring 6 is inserted into the split portion 6a of the
It is possible to contact the end faces 6c, 6c in the circumferential direction of. In addition, the protrusion 24b includes an end surface 24e in the circumferential direction of the end surface locking portion 24a,
End faces 6c, 6 of the lock ring 6 in the circumferential direction at 24e
It is formed so as to project in the circumferential direction from the portion in contact with c. In this case, a groove 6d is formed in a penetrating state along the pipe axis direction on the end surfaces 6c, 6c which are the ends in the circumferential direction of the lock ring 6 in this case, and the protrusion 24b is formed in the groove 6d.
It is possible to enter.

When the centering spacer 24 having such a structure is used, as shown in FIGS. 4 and 5 (a), the end face engaging portion 24a of the centering spacer 24 is provided in the lock ring 6 in the expanded state. The protrusion 24b formed on the end face locking portion 24a is inserted into the divided portion 6a, and the groove portion 6d formed on the end surfaces 6c, 6c of the lock ring 6 in the circumferential direction.
After fitting the lock ring 6, the end face 6 in the circumferential direction of the lock ring 6
The end faces 24e and 24e of the end face locking portion 24a are brought into contact with c and 6c to maintain the lock ring 6 in the expanded state. At the same time, the outer peripheral engaging portion 24c of the centering spacer 24
Is fitted to the outer periphery of a flange (not shown) in the receiving port, and the centering spacer 24 is attached to the receiving port 2. When the centering spacer 24 is attached to the receiving port 2, the tube is then handled in the same manner as the centering spacer 23.

As described above, the protrusion 24b is fitted into the groove 6d formed in the circumferential end surfaces 6c, 6c of the lock ring 6 in the axial direction so that the end 24a is locked by the end surface locking portion 24a. It is possible to prevent the lock ring 6 maintained in the expanded state from being displaced in the pipe radial direction with respect to the centering spacer 24, and to reliably stabilize the expanded state of the lock ring 6.

Further, since the groove portion 6d of the lock ring 6 is formed in a penetrating state, when the centering spacer 24 is pulled out from the receiving port 2 and collected, the protrusion 24b is formed.
Since it can be pulled out from the groove 6d, the centering spacer 24 can be easily recovered from the receiving port 2. Further, in the case of the centering spacer 24, as in the case of the centering spacer 23, if the distance between the end surface locking portion 24a and the outer peripheral engagement portion 24c in the pipe radial direction is set to a predetermined dimension, the pipe shaft is On the other hand, it is possible to center the lock ring.

Further, by manufacturing the centering spacer 23 or the centering spacer 24 by using a biodegradable resin, the centering spacer 23 or the centering spacer 24 is buried in the soil at the piping construction site. It can be decomposed in and processed. Therefore, it is possible to eliminate the need to treat or collect the centering spacer 23 or the centering spacer 24 as waste.

In FIGS. 4 and 5 (a), the protrusion 24b corresponds to the circumferential end faces 24e, 2e of the end face locking portion 24a.
4B shows a case in which it is formed so as to project from 4e in the circumferential direction, that is, the thickness of the projection 24b is thinner than the thickness of the end face locking portion 24a.
As shown in FIG. 5, the protrusion 24b is formed in a tapered shape so that the thickness of the base end portion thereof is the same as the thickness of the end face locking portion 24a. By fitting in the groove portion 6d having a shape corresponding to the shape, the lock ring 6 is maintained in a diameter expanded state, and the lock ring 6 and the centering spacer 24 are prevented from being displaced in the pipe radial direction with respect to the receiving port 2. Is also possible.

Further, as shown in FIG. 5C, when using the centering spacer 24 in which the wall thickness of the end face engaging portion 24a is thinner than the wall thickness of the peripheral portion of the split portion 6a in the lock ring 6, By making the thickness of the protrusion 24b equal to the thickness of the end face locking portion 24a and fitting the protrusion 24b into the groove 6d, the same as in the case shown in FIGS. 5 (a) and 5 (b) is obtained. You can also get the effect.

In the pipe handling method of the above-described embodiment, the diameter expanding step and the mounting step are performed in advance as a pre-work for the pipe joining work, for example, in a pipe manufacturing factory, and the centering spacer 23 receives the pipe. The case where the pipe attached to the mouth 2 is shipped and carried into the piping construction site is shown. However, the present invention is not limited to this, and the receiving port 2 in a state where the centering spacer 23 is not attached is carried into the piping construction site,
At this site, during the waiting time before starting the pipe joining work, for example, during the time required for this excavation work when excavating the soil to the position where the pipe is to be laid, The centering spacer 23 can be attached to the mouth 2 in the same manner as in the above-described embodiment, and can be used as a pre-work for the pipe joining work. In addition, for example, after the excavation of the soil is completed and the laying of the pipeline is started, a pipe that has not yet been joined, that is, a pipe in a waiting state where neither end is joined to another pipe Two
A centering spacer 23 can be attached to the. By doing so, it is only necessary to insert the insertion opening 11 into the receiving opening 2 and join the centering spacer 23 from the receiving opening 2 after inserting the insertion opening 11 when joining the pipes. Therefore, even if the centering spacer 23 is not attached to the receiving port 2 that is carried into the pipe construction site, by attaching the centering spacer 23 to the receiving port 2 in the pipe in the joining waiting state, The time required for the entire joining work can be greatly shortened, as in the case where the receiving port 2 with the centering spacer 23 attached thereto is carried into the piping construction site as described above.

[0044]

As described above, according to the present invention, as a preparatory work for joining pipes, the lock ring housed in the lock ring housing groove is expanded, and the split portion of the lock ring is After keeping the lock ring in the expanded state and inserting the insertion port into the receiving port, fit the spacer that can be recovered from the opening side of the receiving port to the outside of the receiving port through the gap between the receiving port and the insertion port, and lock ring By loading one of the pipes to the pipe construction site with the spacer attached to the pipe, it is not necessary to expand the lock ring to join the pipes at the pipe construction site. All you have to do is insert the mouth and retrieve the spacer. Therefore, the insertion opening can be easily and quickly inserted into the receiving opening, and it is possible to prevent the pipe joining operation from being lengthened as a whole.

Further, at the pipe construction site, by mounting a spacer on the socket of the pipe in the waiting state for joining,
When joining the pipes, it is only necessary to insert the insertion port into the receiving port and recover the spacer from the receiving port after inserting the insertion port. Therefore,
It is possible to greatly reduce the time required for the entire pipe joining work.

Further, since the diameter reduction preventing portion engages with both end surfaces in the circumferential direction of the expanded diameter lock ring,
The lock ring can be maintained in the expanded state. Moreover, since the inner surface support portion engages with the inner peripheral surface around the divided portion of the lock ring, the lock ring kept in the expanded state by the diameter reduction prevention portion is displaced in the pipe radial direction with respect to the spacer. It is possible to prevent and stabilize the expanded state of the lock ring. Further, since the outer peripheral engagement portion of the spacer engages with the outer periphery of the receiving port, it is possible to prevent the spacer and the lock ring from being displaced in the pipe radial direction with respect to the receiving port. Can be further stabilized. Further, if the distance between the inner surface support portion and the outer peripheral engagement portion in the pipe radial direction is set to a predetermined dimension, the lock ring can be centered with respect to the pipe axis.

Further, a projection formed in the circumferential direction from the insertion portion is formed at the circumferential end portion of the lock ring along the axial direction until reaching the end surface of the lock ring on the opening side of the receiving port. By fitting in the groove portion, the lock ring, which is maintained in the expanded state by the insertion portion, can be prevented from being displaced in the pipe radial direction with respect to the spacer, and the expanded state of the lock ring can be reliably stabilized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view in the pipe axis direction showing an embodiment of a pipe handling method of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a perspective view showing a positional relationship between a centering spacer and a lock ring according to the embodiment of the present invention.

4 is a perspective view showing a positional relationship between a centering spacer and a lock ring different from the structure shown in FIGS. 1 to 3. FIG.

5 (a) is a cross-sectional view in the pipe radial direction showing a state in which the lock ring is held in an expanded state by the spacer shown in FIG. 4, and FIG. 5 (b) is different from FIG. 5 (a). When spacers having different shapes are used, FIG.
FIG. 9 is a cross-sectional view in the pipe radial direction showing a case where a spacer having a shape different from that of FIG.

FIG. 6 is a cross-sectional view in the pipe axis direction showing an example of a joint structure having a seismic resistance function in the conventional technique.

7 is a sectional view in the tube axis direction showing a state in which a rubber ring and a lock ring are housed in a lock ring housing groove in the socket of FIG.

8 is a cross-sectional view in the pipe radial direction showing how the lock ring of FIG. 7 is expanded in diameter using a lock ring expander.

FIG. 9 is a perspective view showing a positional relationship between a spacer and a lock ring in a conventional technique.

FIG. 10 is a cross-sectional view in the pipe axis direction showing a pipe joining method according to a conventional technique.

[Explanation of symbols]

One tube 2 mouth 4 Lock ring receiving groove 6 lock ring 6a Dividing part 10 The other tube 11 insertion 12 Insert protrusion 23 Centering spacer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shogo Kaneko             2-26 Ohama-cho, Amagasaki City, Hyogo Stock Association             Kubota Mukogawa Factory (72) Inventor Yoshitoshi Kado             2-26 Ohama-cho, Amagasaki City, Hyogo Stock Association             Kubota Mukogawa Factory F-term (reference) 3H015 FA03 FA04

Claims (4)

[Claims] 1. A lock ring accommodating groove is formed on an inner periphery of a receiving opening of one of the pipes, and the lock ring accommodating groove accommodates an annular lock ring having a divided portion in a circumferential direction, An insertion opening projection is formed on the outer periphery of the insertion opening in the other tube, and the insertion opening is inserted into the receiving opening by passing the insertion opening projection inside the lock ring whose diameter is expanded. Thereby, in the handling method for the pipe in which the one pipe and the other pipe are joined, as a pre-operation of the pipe joining work, the lock ring is accommodated in the lock ring accommodating groove, and In the split portion of the lock ring, the accommodated lock ring is maintained in an expanded state, and after the insertion port is inserted into the reception port, the reception port is passed through a gap between the reception port and the insertion port. From the opening side of the outside of the receiving port A pipe characterized by fitting a storable spacer, and carrying the one pipe to a pipe construction site in a state where the spacer is fitted to the divided portion of the lock ring and the lock ring is expanded in diameter. How to handle. 2. A lock ring accommodating groove is formed on the inner periphery of the receiving opening of one of the pipes, and the lock ring accommodating groove accommodates an annular lock ring having a divided portion in the circumferential direction, An insertion opening projection is formed on the outer periphery of the insertion opening in the other tube, and the insertion opening is inserted into the receiving opening by passing the insertion opening projection inside the lock ring whose diameter is expanded. Thus, in the handling method for a pipe in which the one pipe and the other pipe are joined, the one of the one pipe that has been brought into a pipe construction site and is in a waiting state for joining with the other pipe. In the lock ring receiving groove in the receiving port,
The lock ring is accommodated, the split portion of the lock ring is made to maintain the accommodated lock ring in a diameter expanded state, and the insertion port is inserted into the reception port, and then the reception port and the insertion port. A method of handling a pipe, characterized in that a recoverable spacer is fitted from the opening side of the receiving port to the outside of the receiving port through the gap. 3. An annular lock ring, which is accommodated in a lock ring accommodating groove formed in the inner circumference of the receiving opening of one of the pipes and has a circumferentially divided portion, is expanded to have an inner diameter inside the lock ring. By inserting the insertion opening into the receiving opening by passing through the insertion opening projection formed on the outer periphery of the insertion opening in the other pipe, the above-mentioned when joining the one pipe and the other pipe A spacer for maintaining the expanded state of the lock ring, the inner surface supporting portion capable of engaging with the inner peripheral surface around the divided portion of the lock ring that is expanded in the state of being accommodated in the lock ring accommodation groove. And a diameter reduction prevention portion formed on the inner surface support portion and capable of engaging with both end surfaces in the circumferential direction of the expanded diameter lock ring, and an outer peripheral engagement portion capable of engaging with the outer periphery of the receiving opening. ,
Having a connecting portion that connects the inner surface support portion and the outer peripheral engagement portion, and after the insertion opening is inserted into the receiving opening, through the gap between the receiving opening and the insertion opening A spacer characterized in that it can be collected from the opening side to the outside of the receiving port. 4. A ring-shaped lock ring, which is housed in a lock ring housing groove formed in the inner periphery of the receiving opening of one of the pipes and has a circumferentially divided portion, is expanded to have an inner diameter inside the lock ring. By inserting the insertion opening into the receiving opening by passing through the insertion opening projection formed on the outer periphery of the insertion opening in the other pipe, the above-mentioned when joining the one pipe and the other pipe A spacer for maintaining the expanded state of the lock ring, wherein a groove portion is formed at an end portion in the circumferential direction of the lock ring, the groove portion reaching an end surface of the lock ring on the opening side of the receiving port along the axial direction. The spacer is formed into an insert portion that can be inserted into a split portion of the lock ring in the expanded state, and is formed in the circumferential direction from the insert portion, and fits into the groove portion in the lock ring in the expanded state. A projecting portion, an outer peripheral engaging portion that can engage with the outer periphery of the receiving opening, and a connecting portion that connects the end surface locking portion and the outer peripheral engaging portion, and the insertion portion is inserted into the receiving opening. A spacer characterized in that after the mouth is inserted, it can be recovered from the opening side of the receiving opening to the outside of the receiving opening through the gap between the receiving opening and the insertion opening.