JP2682766B2 - Pipe joining equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joining device, and more particularly, to a receiving port formed by inserting an insertion port formed at the end of the other pipe into the receiving port formed at the end of one pipe. The present invention relates to a pipe joining device for a separation prevention pipe joint in which a lock ring for preventing separation between the mouth insertion openings is mounted between the reception opening insertion openings.

[0002]

2. Description of the Related Art When laying a pipeline, a pipe joining apparatus is used to join a plurality of pipes in sequence. As the pipe joining device, a wire rope type device and a device using an instrument are typical. Of these, the wire rope type applies the wire rope to the joining pipe to be joined to the existing pipe and pulls it toward the existing pipe, or the wire rope is laid across both the joining pipe and the existing pipe. Is a lever block. When using a tool, the joining pipe and the existing pipe are mechanically clamped, and the joining pipes are drawn toward the existing pipe by connecting both clamp portions with a manual jack device or the like.

By the way, in the separation prevention pipe joint using the above-mentioned lock ring, a lock ring which has a split portion formed at one position in the circumferential direction and which can be elastically reduced in diameter is fitted beforehand to the insertion opening. After inserting the insertion opening into the receiving opening, the lock ring is reduced in diameter and pushed into the receiving opening, whereby the lock ring is mounted in the lock ring groove on the inner circumference of the receiving opening.
Then, by engaging this lock ring with a protrusion formed on the outer periphery of the insertion opening, a desired detachment preventing function is obtained.

[0004]

However, when the conventional joining device is applied to this type of separation prevention pipe joint, the work of positioning the pipes in the centered state and the work of pushing in the lock ring are efficiently performed. However, there is a problem in that it requires a great deal of skill and time even for a skilled worker. Further, in the case of a so-called open-cutting method in which a pipeline is laid in a groove cut from the surface of the earth, there is a problem in that the work is carried out in the groove, which poses a danger to the operator.

Therefore, the present invention solves such a problem, and when laying a pipe having a joint structure having a lock ring for preventing disengagement in an excavation groove or the like, the operation can be easily performed without requiring skill. And the pipes can be joined in a short time,
Moreover, the purpose is to prevent workers from being in danger.

[0006]

In order to achieve the above object, the present invention forms an outwardly open tapered surface on the inner periphery of the opening end of a pipe receiving port, and arranges a frame along the axial direction of the pipe. Then, in this frame, the first pipe that holds the already laid pipe
And a second clamping device for gripping a joint pipe to be joined to an existing pipe coaxially with the existing pipe,
Means for moving the clamp device in the direction closer to the first clamp device to insert the insertion opening into the receiving opening, and a lock ring fitted in the insertion opening toward the tapered surface in the axial direction of the pipe. The diameter of the lock ring is reduced by pressing the lock ring, and means for pushing the lock ring into the gap between the inner circumference of the receiving opening and the outer circumference of the insertion opening is provided.

[0007]

With this structure, when joining pipes, a frame is installed at the joining portion, the existing pipe is gripped by the first clamp device, and the joined pipe is fixed by the second clamp device. First, the insertion opening is inserted into the receiving opening by locating and grasping on the same axis as, and moving the second clamping device in the state of approaching the first clamping device. Next, if the pushing means is operated with respect to the lock ring that has been fitted into the insertion opening in advance, the diameter of the lock ring is reduced by the tapered surface at the opening end of the receiving opening, and in this reduced diameter state, between the receiving insertion opening. By being pushed in, it is mounted at a predetermined position between the receiving opening, that is, in the lock ring groove on the inner circumference of the receiving opening. Therefore, joining of both pipes can be completed in a short time in a very simple operation without requiring skill.

In the case of laying a pipeline in the excavation groove, the above work can be performed from the ground side by operating the clamp device, the moving means and the pushing means with a known hydraulic device or motor. It is possible, and the worker does not need to enter the groove to work, so that safe work is possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 3, reference numeral 1 denotes an excavation groove, which is formed from the ground surface 2 to a predetermined depth for laying a pipeline. The pipe 3 laid on the bottom of the excavation groove 1 has a receiving port 4 at one end thereof, and an insertion port 5 to be inserted into the receiving port 4 of another pipe is formed at the other end thereof. Reference numeral 6 denotes a pipe joining device according to the present invention, which is suspended from the unic wheel 7 on the ground surface 2 by a wire rope 24 and lowered to the bottom of the groove 1.

FIG. 4 shows a joint structure of a pipe to be laid.
In the pipe joint structure shown in FIG. 4 (a), the sealing material accommodating groove 31 is formed on the inner side of the receiving port 4 and the sealing material 30 is mounted. A lock ring groove 33 is formed on the inner periphery of the opening end portion of the receiving port 4 which is located at an appropriate distance from the seal material accommodating groove 31, and the lock ring groove 33 is formed with a split portion at one position in the circumferential direction. Lock ring 3 that can be elastically reduced in diameter
5 is attached.

A tapered surface 34 is formed on the inner periphery of the opening end of the receiving port 4 to serve as a guide when the lock ring 35 is inserted. On the outer periphery of the insertion opening 5, the inner flange 3 formed on the inner periphery of the receiving opening 4 to form the seal material accommodation groove 31.
The protrusion 36 located between the 2 and the lock ring 35 is formed by a weld bead. A ring 37 tightly fitted to the outer periphery of the insertion slot 5 is engaged with the protrusion 36. This ring 37 can engage with the lock ring 35 from the back side of the receiving port 4,
The lock ring 35, the ring 37, the protrusion 36, and the insertion opening 5 are engaged with each other, so that separation between the receiving insertion openings is prevented.

The pipe joint structure of FIG. 4B engages with the lock ring 35 by welding a ring to the outer periphery of the insertion port 5 instead of the protrusion 36 and the ring 37 of FIG. 4A. The possible protrusions 38 are formed.

In these pipe joint structures, after the insertion port 5 is inserted into the receiving port 4 in which the sealing material 30 is accommodated in the sealing material accommodation groove 31, the lock ring 35 which is previously fitted to the insertion port 5 is fitted. The lock ring 35 is mounted in the lock ring groove 33 by reducing the diameter by the action of the tapered surface 34 and pushing it into the receiving port 4.

FIG. 1 shows a detailed structure of a pipe joining device 6 according to the present invention for joining pipes 3 having such a pipe joint structure. The pipe joining device 6 has a frame 11 arranged in the axial direction of the existing pipe 3a and the joining pipe 3b. The frame 11 has a pipe body portion near the receiving port 4 of the existing pipe 3a. First clamping device 12 for gripping
And a second clamp device 13 for gripping the insertion port 5 of the joining pipe 3b joined to the existing pipe 3a.

The first clamp device 12 is attached to one end of the frame 11, and the second clamp device 13 is reciprocally movable in the tube axial direction along a linear guide provided on the frame 11. The second clamp device 1 is provided between the frame 11 and the second clamp device 13.
A cylinder device 16 for moving the 3 closer to and further away from the first clamp device 12 is provided.

Each of the clamp devices 12 and 13 has a pair of open / close type clamp claws 22, respectively. Each clamp claw 22 of the second clamp device 13 is provided with a pusher 26 that comes into contact with and pushes the lock ring 35, and a cylinder device 27 that moves the pusher 26 toward the receiving port 5. ing.

Clamp devices 12, 13 and cylinder device 1
A hydraulic control device for the 6 and the cylinder device 27 is provided on the ground surface 2 in FIG. 3, and appropriate piping is provided from the device on the ground surface to each device.

Next, the operation of joining the tubes will be described. First, a new joining pipe 3b to be joined to the existing pipe 3a is carried into a predetermined position in the excavation groove 1. At this time, the lock ring 35 is fitted in advance into the insertion port 5 of the joining pipe 3b. Next, as shown in FIG. 3, the pipe joining device 6 is lowered into the groove 1 by the unicing wheel 7. Then, the first clamp device 12 holds the existing pipe 3a, and the second clamp device 13 holds the joining pipe 3b to be joined. Then, each clamp claw 22 causes both pipes 3
a and 3b are held in a coaxially centered state. FIG. 1 shows this state.

Next, the cylinder device 16 is extended to the second
Clamping device 13 is moved toward first clamping device 12. Then, the insertion port 5 of the joining pipe 3b gripped by the second clamp device is inserted into the inside of the receiving port 4 of the existing pipe 3a.

In this state, the sealing material accommodating groove 31 of the receiving port 4
The sealing material 30 that has been fitted to the above is compressed on the outer peripheral surface of the inserted insertion port 5, and a sealed state between the receiving port 4 and the insertion port 5 is secured. Further, the protrusion 36 and the ring 37, or the protrusion 38 is located between the flange 32 and the lock ring groove 33. At this time, the lock ring 35 that has been fitted in the insertion opening 5 is located near the opening end of the receiving opening 4.

Therefore, the cylinder device 27 provided on the clamp claw 22 of the second clamp device 13 is extended.
At this time, the outwardly open tapered surface 34 is formed at the opening end of the receiving port 4, but as shown in FIG. 2, the corresponding tapered surface 39 is also formed on the outer periphery of the lock ring 35. Has been done. Therefore, when the pusher 26 attached to the cylinder device 27 pushes the lock ring 35, the lock ring 35 is reduced in diameter by the reaction force from the tapered surface 34 based on the pressing force, and the inner circumference of the opening end of the receiving port 4 is reduced. It becomes possible to pass.

That is, when the pusher 26 pushes the lock ring 35 toward the receiving port 4, the lock ring 35 first engages with the inner periphery of the opening end of the receiving port 4 as shown in FIG. And tapered surfaces 34, 3 as shown in (b)
The lock ring 35 is pushed in while contracting due to the engagement of the nine members, and passes through the inner circumference of the opening end of the receiving port 4 as shown in FIG. When the lock ring 35 is further pushed to reach the position of the lock ring groove 33, the lock ring 35 expands in diameter by the elastic restoring force as shown in (d) and fits into the lock ring groove 33. In this way, the lock ring 35 fitted in the receiving port 4 can be engaged with the ring 37 or the protrusion 38 on the insertion port 5 side, and the state where both pipes are prevented from coming off is achieved. This completes the joining work.

[0023]

As described above, according to the present invention, an outwardly open taper surface is formed on the inner periphery of the opening end of the receiving end of the pipe, and the frame is arranged along the axial direction of the pipe. In the frame,
A first clamp device for gripping an existing pipe that has already been laid, a second clamp device for gripping a joining pipe to be joined to the existing pipe coaxially with the existing pipe, and a second clamp device for the first clamp device. Means for inserting the insertion opening into the receiving opening by moving the locking ring fitted to the insertion opening toward the taper surface in the axial direction of the pipe, Since the lock ring is made to have a diameter, and a means for pushing this lock ring into the gap between the inner circumference of the receiving opening and the outer circumference of the insertion opening is provided, the lock ring that has been fitted beforehand in the insertion opening is inserted into the receiving opening by the pushing means. It can be installed in a predetermined position between the mouths, that is, in the lock ring groove on the inner circumference of the receiving mouth, and joining of both pipes can be completed in a short time with extremely simple work without requiring skill. it can. Also, when laying a pipeline in the excavation groove, all the above work can be performed from the ground side by operating the clamp device and pushing means with a known hydraulic device or motor, etc. Since it is not necessary to work in the groove, safe work can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pipe joining device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a pipe joining process using the same apparatus.

FIG. 3 is a schematic diagram showing a state in which the device is lowered from the ground surface side into a groove.

FIG. 4 is a diagram showing an example of a pipe joint structure that can be joined by the same device.

[Explanation of symbols]

 3a Existing pipe 3b Joining pipe 6 Pipe joining device 11 Frame 12 First clamping device 13 Second clamping device 16 Cylinder device 26 Pusher 27 Cylinder device 35 Lock ring

Claims (1)

(57) [Claims] 1. A lock ring that inserts an insertion opening formed at the end portion of the other tube into the inside of the reception opening formed at the end portion of one of the pipes to prevent separation between the receiving opening insertion ports. A pipe joining device for a separation prevention pipe joint, which is adapted to be installed between these receiving and inserting ports, wherein an outwardly opening tapered surface is formed on the inner circumference of the opening end of the receiving end of said one pipe, Frame along the axial direction of
And a second clamp device that grips an already laid existing pipe on this frame, and a second clamp device that grips the joining pipe to be joined to the existing pipe coaxially with the existing pipe, A means for moving the second clamp device toward the first clamp device so as to insert the insertion opening into the receiving opening, and a lock ring fitted in the insertion opening toward the tapered surface so that the pipe axis A pipe joining device, characterized in that a means for pushing the lock ring into the gap between the inner circumference of the receiving opening and the outer circumference of the insertion opening is provided while reducing the diameter by pressing in the axial direction.