JPS6357672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device, in particular a mobile device for laying continuous pipework. Most advantageously, the invention finds application in oil and gas pipelines, water supply systems, intraductal air conveyors, and the like.

Since 1950, when resistance welding was first used for pipe laying, improvements in this type of welding were aimed at higher efficiency in the assembly and welding of pipes into continuous pipelines. The method of laying continuous pipelines consists of a large number of types of operations, which can often only be carried out under continuous conditions. Therefore, omitting the time consumed in preparatory and preparatory work carried out between operations significantly reduces the duration of pipeline laying and allows for highly productive methods such as resistance welding. make it available for use. It should be noted that a butt joint only takes 0.5 to 1 second, flash removal takes 1 to 5 seconds, and heat treatment of one weldment takes 5 to 60 seconds. At the same time, the preparatory and auxiliary work performed between operations by normal equipment takes 10 to 30 minutes. The urgency of the problem becomes clear when you consider that there will be more than 100,000 welds in the main pipe line. The results of studies of the possibilities of conventional equipment show that this problem has not been satisfactorily solved to date.

Conventionally known is a mobile device for resistance welding pipes with a diameter of 529 mm into continuous pipelines (VKLebedev, GVGorbunov,
Kontaktnaya svarka truboprovodov,
“Reklama” Publishing, Kiev 1968, p. 18). This equipment includes a pipe laying device having a jib from which a welding head is suspended. The welding head surrounds the pipe being welded and is supported by its walls on rollers. The pipe laying means has a power set connected to the welding head by an electrical cable. This device is only capable of welding pipes, while operations such as internal flash removal and external flash removal can only be performed manually.

A very efficient device for laying pipelines is also known (VKLebedev, GV
Gorbunov, Kontaktnaya svarka
truboprovodov, “Reklama” Publishing, Kiev,
1968, p. 23). The device includes an in-pipe resistance welding device that is supported by the pipeline wall and connected to a power source. This device has an independent drive mechanism and an internal flush trimmer. The device has an external flash trimmer which is suspended from the jib of the pipe laying means. In front of the pipe laying means is a further pipe laying means, the jib of which carries a suspension with support rollers for supporting the pipeline. This suspension is tied directly to a rope that passes over the end of the jib.

The obvious advantage of this welding device is that it not only enables the welding process but also automates the flash removal. However, the productivity of this welding equipment is limited by the need to perform a large number of auxiliary operations. For example, in order to remove the flash after welding the pipe, the pipe laying means carrying the suspension can be thrown aside by lowering the pipeline onto a support or by piling earth beneath it by means of a bulldozer and removing the flash from the outside. The pipe laying means carrying the flash trimmer is located, the pipeline laying means is brought to the weldment and only the outer flash is removed. It should be noted that it is best to remove the flash immediately after welding, while still hot, but this may not be possible due to the need for the auxiliary operations described above.

The object of the invention is a mobile device for the laying of continuous pipelines, in which the suspension and mutual arrangement of the main units makes it possible to remove the outer flash immediately after welding without the need for multiple auxiliary operations, increasing the efficiency of the process. Our mission is to provide what is possible.

This purpose consists of a resistance welding device supported by the pipeline wall and connected to an electric power source;
an external flush trimmer and at least one pipe laying means, the jib of the means carrying a suspension for supporting the pipeline, the jib of the means carrying a suspension for supporting the pipeline; For laying a continuous pipeline, having a longitudinal support structure carrying, the front end of the longitudinal support structure carrying a flash trimmer and the rear end of the longitudinal support structure carrying an inductor for heat treatment of the weldment. This is accomplished by a mobile device.

Such a configuration allows immediate removal of the outer flash after resistance welding while the weldment and flash are hot. In this case, no lowering of the pipeline supported by the suspension is necessary.
Elimination of multiple auxiliary operations can greatly improve device productivity. In addition to this, the longitudinal support structure makes it possible to conveniently arrange the equipment for the heat treatment of the weldment and favors a high quality of the weldment, apart from a high productivity of the equipment. Twice fewer personnel are required to staff the apparatus of the invention than in a conventional arrangement.

A variant structure in which two pipe-laying devices are arranged on both sides of the pipeline to be laid and the longitudinal support structure is suspended from the jib of the pipe-laying means with the help of a crosspiece is more stable.

In order to compensate for unsynchronized movements of the pipe laying means and to prevent damage to the pipeline due to bending, it is recommended to pivotally connect the longitudinal support structure to the crosspiece.

Preferably, the jib of the pipelaying means is made from a vertical member and the crosspiece is suspended from said member in such a way that the projection of the gland onto the horizontal support surface divides the corresponding track width into two substantially equal parts.

This equally distributes the load on the caterpillar tracks of the pipelaying equipment, eliminates heavy counterweights, and allows the equipment to operate in areas with complex undulations.

The invention will now be described with reference to specific embodiments and with reference to the accompanying drawings.

The movable device of the present invention for laying a continuous pipe system is equipped with a resistance welding device as shown in FIG. In this Figure 1, a welding device 1 is supported by the wall of the tubing and connected to an electrical power source (not shown). The pipe butt welding device is equipped with an internal flash removal cutter. Such an in-pipe butt welding device 1 does not constitute a feature of the present invention, and therefore will not be described in detail. If necessary, please refer to the specification of US Pat. No. 4,273,985 by the present inventor. It is also optional to weld the pipe ends together by incorporating an extra-tube welding device instead of the intra-tube welding device. The mobile device according to the invention further comprises at least one pipe laying means 2, which has a jib 3 and is parallel to the pipeline 4 to be laid. According to the invention, a longitudinal support structure 6 is suspended from the jib 3 of the pipe laying means 2 with the aid of a flexible joint 5. The front end of the longitudinal support structure 6 carries an external flush trimmer 7. The rear end of the longitudinal support structure 6 carries an inductor 8 for heat treatment of the weldment.
The inductor 8 is attached to the longitudinal support structure 6 via an adjustable connecting rod 9 and has an inductor positioning mechanism for accurately positioning the inductor over the weldment. The inductor positioning mechanism 10 has an electric motor 11 whose shaft 12 has a bevel gear 1
It carries 3. This bevel gear 13 meshes with a bevel gear 14 fixed to the adjustable connecting rod 9. The longitudinal support structure 6 has a suspension 15 attached thereto, which suspension has support rollers 16 for supporting the pipeline 4 . Suspension 1 best shown in Figure 2
5 is essentially two longitudinal members 17 and 18
These are connected by a connecting member 19. The support rollers 16 are arranged in radial relationship with the pipeline 4 supported thereby.

The variant arrangement shown in FIG. 3 is characterized by greater stability. According to this variant, the mobile device has two pipe laying means 20, 21, which are located on either side of the pipeline 4 to be laid. The jibs 3 of the pipe laying means 20 and 21 are symmetrically inclined towards the pipeline 4. According to the invention, a crosspiece 22 is suspended from the jib 3. The longitudinal support structure 6 has a vertical pivot 23
and the horizontal pivot 24, the crosspiece 22
mounted on. In the preferred embodiment shown in FIG. 4, the jibs 3 of the pipe laying means 20 and 21 are made as vertical members 25 and 26. In this embodiment, crosspiece 22 is suspended from vertical members 25 and 26 at points 27 and 28. point 27
, on the horizontal support surface of the ground 29 divides the track width of the pipelaying means 20 into two substantially equal parts. This evenly distributes the load on the caterpillar track and prevents heavier counterparts.

Figures 5 and 6 show the deformation of the mobile device on an inclined part of the ground when the pipe laying means 20 and 21 are inclined in different directions and inclined to one side.

The continuous pipeline laying device described above works as follows. The welding device 1 moves within the pipe towards one end thereof and aligns this pipe with the pipeline 4. After welding the pipe to the pipeline 4, the device 1 removes the internal flash and moves it to the area of the next weld to be performed. At this moment the pipe laying means 2 starts its movement behind the device 1. The outer flash trimmer 7 then passes over the weldment and removes the outer flash from the still hot weldment. As the pipe laying means 2 moves, the support rollers 16
rolls over the surface of the pipeline 4 and the pipe to be welded thereto. When the inductor 8 approaches the welding area, the pipe laying device 2 stops. By switching the electric motor 11 open and closed, the length of the rod 9 changes and the inductor is correctly positioned above the workpiece. The inductor 8 heats up at a predetermined rate to a predetermined temperature, so that the weldment is subjected to a heat treatment. The length of the elongated support structure 6 corresponds to the length of the pipe to be welded. Thus, when the inductor 8 is placed over one weldment, the outer flash trimmer 7 is located in the area of the next weldment. From then on, the mobile device operates essentially as described above.

The mobile device variant shown in FIG. 3 works in the same manner as described above. However, it is more stable and allows pipes to be welded in off-road areas or in areas characterized by complex undulations. In this case, the inclination of the pipe laying means and the asynchrony in its movement are compensated by the flexible joint 5, the pivots 23 and 24. The embodiment shown in FIG. 4 is the most stable. As shown in FIGS. 4-6, the jib is in the form of a vertical member, which is connected to the pipe laying means 20 and 21.
The load is distributed equally on the caterpillar track.
Even on fairly sloping sides of hills or valleys, the vertical projection of each point 27 and 28 onto the supporting surface of the ground 29 is within the limits of the track width of the pipe laying means 20 and 21.

As is clear from FIG. 5, when the undulations of the earth cause the pipe laying means 20 and 21 to tilt in different directions, the crosspiece 22 is held in a horizontal position, while the movable joint 5 rotates. however,
When the pipe laying means 20 and 22 move on one slope, i.e. are inclined in one direction, the movable joint rotates to maintain the crosspiece 22 parallel to the surface of the slope. When this occurs, the longitudinal support structure 6 remains in a horizontal position in rotation about the horizontal pivot 24.

Although specific embodiments of the invention have been described, it will be appreciated that various modifications may be made within the scope of the invention by those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a mobile device for laying continuous pipelines according to the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. 3 is a modification of the mobile device with two pipe laying means. For example, FIG. 4 shows a variant of a mobile device with vertical members of a pipe-laying device, FIG. Mobile device of the invention with a pipe-laying device. DESCRIPTION OF SYMBOLS 1... Resistance butt welding device, 2... Pipe laying device, 3... Jib, 6... Longitudinal support structure, 7
...Outer flash trimmer, 8...Inductor,
15... Suspension, 20, 21... Pipe laying device, 22... Cross piece, 25, 26...
...Vertical member.

Claims (1)

[Scope of Claims] 1. A mobile device for laying continuous pipelines, comprising at least a resistance welding device 1 supported by the wall of the pipeline and connected to an electric power source, and an external flash trimmer 7. one pipe laying means 2, the jib 3 of said means carrying a suspension 15 for supporting the pipeline, which is suspended from the jib 3 of the pipe laying means 2 and said suspension 15; a longitudinal support structure 6 carrying a longitudinal support structure 6;
A mobile device for laying continuous pipelines, the front end of which carries a flash trimmer 7 and the rear end of the longitudinal support structure 6 carrying an inductor 8 for the heat treatment of the weldment. 2. Two pipe-laying means 20 and 21 are arranged on either side of the pipeline being laid, and the longitudinal support structure 6 is suspended from the jib of the pipe-laying means via a cross-piece 22. A mobile device according to scope 1. 3. The movable device according to claim 2, wherein the longitudinal support structure 6 is rotatably connected to the crosspiece. 4 The jib 3 of the pipe laying means is a vertical member 25
and 26, the crosspiece 22 is suspended on said vertical members 25 and 26 at the point where its projection onto the horizontal support surface of the earth divides the corresponding pipe laying means into two substantially equal parts. A movable device according to claims 2 and 3.