JPH0565976A - Pipe joiner - Google Patents

Abstract

PURPOSE:To make pipes joinable in an open trench without making an operator get into the trench as well as without requiring no skillfulness. CONSTITUTION:A first clamper 12, holding a pipe 3 installed so far in a trench 1, and a second clamper 13, holding another pipe 3 being joined to this existing pipe 3 concentrically with this existing pipe 3 are installed in a frame 11 to be lower to the inside of this trench 1 from the side of a ground surface 2. The second clamper 13 is drawn nearer to the first clamper 12 by a cylinder unit 16, thus the other pipe 3 is joined to the existing pipe 3. With this constitution, with only operation at the ground surface side, pipe joining is safely performable without making an operator get into the trench.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joining apparatus for joining pipes laid in an open cut groove.

[0002]

2. Description of the Related Art Conventionally, when a pipe is laid by an excavation method, a pipe joining device may be used to sequentially join the pipes arranged in the excavation groove. As the pipe joining device, a wire rope type device and a device using an instrument are typical. Among them, the wire rope type hangs the wire rope on the pipe to be joined and pulls it to the existing pipe side, or the wire rope is laid across both the pipe to be joined and the existing pipe, and this is the lever block. It is something that is pulled by hand. When using a tool, the pipe to be joined and the existing pipe are mechanically clamped, and both clamps are connected with a manual jack device so that the pipe to be joined faces the existing pipe. Are attracting.

[0003]

However, in such a conventional pipe joining apparatus, an operator must enter the groove, which is dangerous and requires skill in centering and joining the two pipes. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to allow a worker to join pipes in an open-cut groove without entering the groove or requiring skill. To do.

[0005]

In order to achieve the above object, the present invention has a frame that is lowered from the ground side toward the inside of the groove, and a frame for holding a pipe already laid in the groove. One clamp device, a second clamp device that grips another pipe to be joined to this existing pipe coaxially with this existing pipe, and this second clamp device close to the first clamp device. And means for inserting one end of the existing pipe and the other pipe into the other end by moving the pipe in the direction.

[0006]

In such a structure, when the pipes in the groove are joined together, the frame is lowered from the ground surface into the groove, and the first clamp device holds the existing pipe and tries to join the pipes. Of the tube of the second clamp device,
Hold on the same axis as the existing pipe. And in that state the second
By moving the clamp device of (1) in the direction of approaching the first clamp device, the two pipes are connected to each other. The above work is
It is possible to perform all from the ground side by operating the clamp device or the like with a known hydraulic device or the like. Further, since the pipes are centered only by gripping the pipes with both clamp devices, and the joining work can rely on mechanical force, the work does not require skill.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 5, reference numeral 1 is an open-cut groove, which is formed from the ground surface 2 to a predetermined depth for laying a pipeline. The pipe 3 laid at the bottom of the excavation groove 1 has a receiving port 4 at one end thereof and an insertion port 5 at the other end thereof.
Inside the socket 4 of the existing pipe 3 already laid in the groove 1,
The insertion opening 5 of the pipe 3 to be laid from now on is inserted.
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 and lowered to the bottom of the groove 1.

1 to 4 show the detailed structure of the pipe joining device 6. This pipe joining device 6 has a frame 11 arranged along the axial direction of both pipes 3, 3, and this frame 11 has a pipe barrel on the side of the receiving port 4 of the existing pipe 3. A first clamp device 12 for gripping a portion and a second clamp device 13 for gripping an insertion port 5 of another pipe 3 joined to the existing pipe 3.
And a third clamp device 14 for gripping the tube body at a position spaced from the insertion port 5.

The first and third clamping devices 12, 14 are
It is fixed at both ends of the frame 11. The second clamp device 13 is reciprocally movable in the tube axis direction along a linear guide 15 provided on the frame 11, and the second clamp device 13 is provided between the frame 11 and the second clamp device 13.
There is provided a cylinder device 16 for driving the clamp device of (1) toward and away from the first clamp device 12. The inner surface of the clamp claw of the third clamp device is provided with a sliding material such as fluororesin in order to allow the tube 3 to slide in the axial direction.

FIG. 4 shows a detailed structure of each of the clamp devices 12, 13, and 14. Here, 17 is a frame body, and in the first and third clamp devices 12 and 14, the frame body 17 is fixed to the frame 11. A cylinder device 18 is attached to the frame body 17, and the cylinder device 18 expands and contracts in a direction perpendicular to the tube axis. A pair of links 20 is attached to a block 19 at the end of expansion and contraction of the cylinder device 18, and the links 20 are formed by a pair of bell cranks 21 supported by a frame 17 by a central shaft 21a.
Are connected to one end of each. Each bell crank 21
C-shaped clamp claws 22 are respectively connected to the other end portions of the, and between the clamp claws 22 and the frame body 17,
Link 23 that forms a parallel link with Bell Crank 21
Is provided. Therefore, when the cylinder device 18 is expanded / contracted, the clamp claw 22 is moved in parallel to open / close, and the pipe 3 is gripped when it is closed.

As shown in FIG. 5, the pipe joining device 6 is suspended from the unic wheel 7 by using, for example, a wire rope 24.
Eye bolts 25 are provided for hanging. In addition,
Each cylinder device and the like are hydraulically controlled, and the control device is provided on the ground surface 2 side, and appropriate piping is provided from this control device to each device.

Next, the operation of joining the tubes will be described. A new pipe 3 to be joined to the existing pipe 3 is previously carried into a predetermined position in the excavation groove 1, and the pipe joining device 6 is lowered into the groove 1 by the unic wheel 7 as shown in FIG. Then, the first clamp device 12 grips the existing pipe 3, and the second and third clamp devices 13 and 14 grip the pipe 3 to be joined. Then, the clamp claws 22 hold the tubes 3 and 3 coaxially in a centered state. FIG. 2 shows the state at this time.

In this state, the cylinder device 16 is extended and the second clamp device 13 is moved along the linear guide 15 in the direction approaching the first clamp device 12. At this time, since the third clamp device 14 allows the pipe 3 to slide,
The insertion port 5 of the pipe 3 gripped by the clamp device 13 is inserted into the receiving port 4 of the existing pipe 3, and the joining of the both pipes 3 is completed. 3 and 1 show the state at the time of completion of this joining.

The pipe 3 has a so-called slip-on type pipe joint for compressing an annular sealing material between the inner surface of the receiving port 4 and the outer surface of the insertion port 5. In this slip-on type pipe joint, if the sealing material does not exist at the prescribed position when the joining is completed and there is a positional deviation, it will cause leakage of fluid in the pipe, so it is necessary to inspect the position. There is. Therefore, conventionally, after joining is completed, a gauge is inserted from the opening end side of the receiving port between the inner surface of the receiving port and the outer surface of the insertion port, and the gauge is applied to the sealing material to inspect the position. ing. However, in order to perform work using such a gauge, an operator still has to enter the groove, which is not preferable.

Therefore, in the pipe joining device 6 of the present invention, as shown in FIG. 1, the frame 11 is provided with an inspection device 26 capable of inspecting the position of the sealing material from the ground surface 2 side.
The inspection device 26 will be described below with reference to FIGS.

In FIG. 6, 27 is an ultrasonic flaw detector, which is provided on the ground surface 2 side. The inspection device 26 inside the groove provided in the frame 11 of FIG. 1 includes a probe 28 that is accessible to the outer surface of the receiving port 4 of the tube 3 and between the inner surface of the receiving port 4 and the outer surface of the insertion port 5. It has a nozzle 29 capable of pouring water. An alarm device 30 such as a lamp or a buzzer is connected to the ultrasonic flaw detector 27.

Next, a method of inspecting the position of the sealing material will be described. As shown in FIGS. 3 and 1, the insertion port 5 into the receiving port 4
6 is completed, the probe 28 is brought close to the outer surface of the receiving port 4 and ultrasonic waves are emitted in the pipe radial direction while water is being injected from the nozzle 29, as shown in FIG.

FIG. 7 shows a case where the sealing material 31 exists at a normal position between the receiving port 4 and the insertion port 5. 32 is water from the nozzle 29. At this time, all of the ultrasonic waves emitted from the probe 28 are reflected at the boundary between the inner surface of the metal receiving port 4 and the surface of the rubber sealing material 31 and are reflected by the probe 28.
Returning to, it is detected as the B1 wave shown in FIG. Also,
This B1 wave is retroreflected on the outer surface of the receiving port 4, propagates again in the pipe radial direction, and is reflected at the boundary with the sealing material 31, and this reflected wave is detected as the B2 wave, slightly behind the B1 wave. To be done.

In FIG. 9, the position of the sealing material 31 is not normal,
It shows the case where it has entered the far side of the mouth extremely. In this case, the water 32 from the nozzle 29 is filled between the inner surface of the receiving port 4 and the outer surface of the insertion port 5, and a part of the ultrasonic waves from the probe 28 propagates in the water 32 and is inserted. After reflecting on the outer surface of the mouth 5, it returns to the probe 28. Since this is detected as a Bs wave as shown in FIG. 10, an abnormality in the position of the sealing material 31 is detected by this, and an alarm is issued by the alarm device 30.

By detecting the presence or absence of the Bs wave on the surface side in this way, the operator can inspect the position of the sealing material 31 without entering the groove, and from this point as well, safety is ensured. Can contribute to.

[0021]

As described above, according to the present invention, the first clamp device for gripping the pipe already laid in the groove on the frame lowered from the ground side toward the inside of the groove, and the existing pipe. A second clamp device for holding another pipe to be joined to the same pipe coaxially with the existing pipe, and moving the second clamp device toward the first clamp device to move the existing pipe. And a means for inserting one end of the other pipe into the other end are provided, the work of gripping the pipes with these clamp devices lowered from the surface side and joining the two pipes is a well-known hydraulic pressure. Since it can be done from the ground side using a device etc., there is no need for the worker to enter the groove,
You can work extremely safely. Further, since the pipes are centered only by gripping the pipes with both clamp devices and the joining work can rely on the mechanical force, the work can be performed without requiring skill.

[Brief description of drawings]

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

FIG. 2 is a front view of the pipe joining device.

FIG. 3 is a front view of a main part of the pipe joining apparatus in a joining completed state.

FIG. 4 is a sectional view of a clamp device in the pipe joining device.

FIG. 5 is a schematic view showing a state in which the pipe joining device is lowered into a groove.

FIG. 6 is a view showing a device for inspecting the position of a sealing material in the pipe joining device.

FIG. 7 is a sectional view of the pipe joint showing a state in which the position of the sealing material is normal.

FIG. 8 is a diagram showing an example of a detected waveform in the state of FIG.

FIG. 9 is a cross-sectional view of the pipe joint showing a state when the position of the sealing material is abnormal.

FIG. 10 is a diagram showing an example of detected waveforms in the state of FIG. 9.

[Explanation of symbols]

 1 Open-cut groove 2 Ground surface 3 Pipe 6 Pipe joining device 11 Frame 12 First clamp device 13 Second clamp device 16 Cylinder device 26 Inspection device

Claims (1)

[Claims] 1. A device for joining pipes laid in a groove cut from the surface of the earth, comprising a frame that is lowered from the surface side toward the inside of the groove, and this frame is provided in the groove. A first clamp device for gripping an already laid pipe, a second clamp device for gripping another pipe to be joined to this existing pipe coaxially with this existing pipe, and this second clamp A pipe provided with means for moving the device toward the first clamping device to insert one end of the existing pipe and the other pipe into the other end. Joining device.