JPH07259105A - Laying method for pipeline - Google Patents

Abstract

PURPOSE:To shorten a period of pipeline-laying construction, by a method wherein a series of processes ranging from tack-welding of standard length pipes to pushing-out of a laid pipe are continuously constructed, in a widened channel at the end part of a pipeline-laying channel. CONSTITUTION:An assembling line 4, a lengthening line 5 and a laying line 6 are placed in that order side by side on a working floor 3 on the bottom of a widened channel 2 constructed at the end part of a pipeline-laying channel 1. After standard length pipes 10 carried in the widened channel 2 are placed on roller bearing units at the assembling line 4 and are sent out, they are turned to a specified length pipe by setting a bevel groove between the pipes 10 to each other and by tack-welding, and the specified length pipe is shifted to the lengthening line 5. Other pipes 10 are progressively sent one after another to the assembling line 4 being vacant, the bevel groove is set to each other and tack-welding is carried out. The specified length pipe is regularly welded at the lengthening line 5 by automatic welding equipment prepared. Processes wherein a lengthened pipe 11 is shifted to the laying line 6 and is welded to the end of a laid pipe 12, and weld inspection, painting and adjustment are carried out, following which the laid pipe 12 on roller bearing units is pushed in the pipeline- laying channel 1 by a jack, are continuously constructed and a pipeline can be efficiently laid down.

Description

Detailed Description of the Invention

[0001]

[Industrial application field] The present invention relates to a pipeline laying method for oil or natural gas.

[0002]

2. Description of the Related Art As an example of conventional technology, a case of laying a submarine pipeline (inner diameter 1.0 m, length 5.0 km) across the strait will be described. In this case, the procedure is performed as follows, but a vast pipeline yard is required, and there are many problems in securing the accuracy in the axial direction when the length of a single pipe is increased by welding.

That is, in order to construct a pipeline yard, a site of about 150 m × 150 m is required at the end of the pipeline line, and an H-shaped steel or the like is used so that the top end becomes a horizontal plane in the direction orthogonal to the pipeline. Nari Sleeper is laid out at a pitch of about 5 m.

A single pipe pipe (inner diameter φ1.0 m, length 10 m) transported by truck is hung on a sleeper by a crane, and 10 pipes are arranged in series in a direction orthogonal to the pipeline. That is, they are arranged in a straight line having a length of 100 m.

The single pipes thus arranged are welded to form a long pipe. After rolling and shifting this lengthened pipe to an adjacent line for welding inspection, it is further rolled and shifted to an adjacent line to modify the coating of the weld 1
00m long pipe is completed.

Elongated pipes corresponding to the entire length of the pipeline are constructed and stocked one after another. That is, 5.
When laying a 0 km pipeline, 50 lengthened pipes will be stocked.

Connect a wire to the tip of this elongated pipe,
Pull out with a winch installed on the opposite side of the strait. After pulling out one pipe, that is, 100 m, the next lengthened pipe is welded, and inspection, coating modification treatment, etc. are performed, and then 100 m is pulled out. A pipeline is laid up to the opposite bank by repeatedly pulling out elongated pipes in units of such processes.

As described above, the conventional construction method requires a vast pipeline yard for carrying in a large amount of pipe single pipes, lengthening them, and stocking them, and a work area for running crane vehicles in which pipes are lined up.

[0009] Further, the earth retaining excavation method and the shield method have been used as the construction method of the pipeline, but there are problems in terms of the influence on the existing facility and the safety or work efficiency during the pipeline construction.

The soil retaining excavation method is a method of excavating the entire line of the pipeline with sheet pile soil retaining, performing welding, inspection, heavy corrosion protection coating, jute winding, etc. and then backfilling with high quality earth and sand to excavate the entire line. As long as the pipeline laying work is completed, the temporary construction will continue for a long period of time, which will inevitably affect the facility itself and the vehicles that travel.

When the tunnel is excavated by the shield construction method to construct the guideway, after the pipe is pulled into the guideway, welding, inspection, anticorrosion and the like are performed inside the guideway. The shield method does not affect various facilities such as railways or roads and running vehicles except for the vertical shaft. However, the shield construction method has a poor work efficiency in a narrow guideway.

Further, a pipe suspended from a vertical shaft at the entrance of the guideway is constructed in the vertical shaft so that the length of the vertical shaft is sufficient for welding, inspection, anticorrosion, etc., and the pipe is pushed into the guideway in order. The shield method is better than the above method, but the work efficiency is poor because the next work cannot be performed unless a series of joint work is completed.

[0013]

As described above, in the conventional pipeline laying, a vast pipeline yard is required, the influence on the traveling vehicle in the soil retention excavation method, or the working environment in the shield method. However, there were problems such as a decrease in work efficiency. The present invention is intended to solve these problems.

[0014]

A pipeline laying method according to the invention of claim 1 is a pipeline laying method,
At the end of the pipeline main conduit, an assemble line, a lengthening line, and a widening conduit in which the main line is sequentially arranged in parallel are provided, and the main conduit is provided from the tip of the main line. The temporary pipes to be laid in the lengthening line are temporarily attached, and the pipes are shifted horizontally to be permanently welded in the lengthening line. It is characterized in that the pipe is laid continuously by repeatedly extruding the pipe to the main conduit.

According to a second aspect of the present invention, in the pipeline laying method according to the first aspect, a tunnel is excavated in the ground by the shield method to form a widening guideway and a main guideway, and a shield starting shaft at the base end of the widening guideway. It is characterized in that a single pipe to be laid from above is carried into the widening guideway.

According to a third aspect of the present invention, in the pipeline laying method according to the first and second aspects, a conveying device is provided on the assemble line, the main line and the main guideway, and the pipe single pipe is placed on the convey device of the assemble line. Temporarily lengthening the pipe by placing the pipe and the permanent pipe on the carrier device of the main line and the main guideway and extruding them. Claim 4 is the pipeline laying method of claim 3. It is characterized in that the main pipe, which is placed on the transfer device and pushed out to the main guide, is laid down and fixed on the transfer device.

According to a fifth aspect of the present invention, in the pipeline laying method according to the third aspect, after the leg saddle is erected on the lower side of the main pipe which is placed on a conveying device composed of a tire bearing and pushed out to the main guideway, This is a pipeline and laying method characterized by removing the tire air from the tire bearing, transferring the load of the main pipe to the leg saddle, fixing the main pipe to the leg saddle, and removing the tire bearing.

[0018]

EXAMPLE FIG. 1 shows an example in which soil is excavated along a road that has been embanked to provide a guideway and a pipeline is laid. At the end of the main pipeline 1 with a width of 3 m, a width of 6 m and a length of 70 m
The widening guideway 2 is constructed.

As shown in FIG. 2, a work floor 3 is provided on the bottom surface of the widening guideway 2, and an assembling line 4, a lengthening line 5 and a main installation line 6 are provided in parallel on the work floor 3 in this order. Assemble line 4 and main line 6 are shown at 2 in FIGS.
A roller bearing 7 composed of a pair of tapered rollers or parallel rollers or a tire bearing 7 ′ composed of a pair of two tires is arranged in a straight line at an interval of 5 m to form a conveying device. Further, in the elongated line 5, a plurality of channel steels 8 are laid out at intervals of 20 m in a direction orthogonal to the line and a sleeper is provided.

The main conduit 1 extends in a straight line from the tip of the main line 6, and a work floor and roller bearings are provided on the lower surface thereof (not shown) as in the main line.

Next, an embodiment in which a cave is excavated in the ground by a shield construction method and a pipeline having an inner diameter of 1.0 m without a guideway is laid in the embankment road I will explain along. 6 to 8, the widening guideway 2 is shown as a solid line for the sake of clarity, but it is actually a cave that is excavated underground. Although specific dimensions are given here, the basic construction method does not change even if the scale changes.

As shown in FIG. 6, the shield starting shaft 9 (10.5) is constructed by excavating the soil, excavating the underground wall or caisson method.
mx 6m x 7.5m depth). As for the length of the shaft in the vertical axis, the standard length of the pipe is 10 m, and the allowance for suspending this is 0.5 m. The distance between the vertical shafts is 5 to 10 km.
The vertical shaft is best placed within the roadbed, but some of it is unavoidable even outside the site.

As shown in FIG. 7, a working widening guideway 2 having an inner diameter of 5 m × 70 m (extension) is produced.

This is also best if it is stored in the roadbed, but it is unavoidable that part of it is outside the site.

As shown in FIG. 8, at the tip of the widening guideway 2, the main guideway 1 having an inner diameter of 3 m with a standard cross section is excavated. It will be built on the roadside.

Also in this embodiment, as shown in FIG. 9, a work floor 3 is provided on the widening guideway 2 and the main guideway 1. Although not shown, the widening guideway 2 is provided with an assemble line,
The lengthening line and the main installation line are arranged side by side in order, and the roller bearings are arranged on the assembly line, main installation line and main installation guideway.

In order to lay a pipeline on a guideway which is formed by the above-mentioned excavated guideway or a tunnel excavated by the shield construction method, the pipe single pipe 10 having a heavy anticorrosion coating with a width of 10 cm left in advance is widened. Bring it into the guideway 2. The tunnel is excavated by the shield construction method and is loaded into the widening guideway 2 provided in the ground from the vertical shaft 9 and carried in.

As shown in FIG. 1, FIG. 2 and FIG. 10, the pipe single pipe 10 carried in is placed on the roller bearing 7 in the assemble line 4 and sent out to sequentially align the groove between the single pipes 10 and temporarily attach it. The length is 70m.

The temporarily attached pipe having a length of 70 m is rolled and shifted to the lengthening line 5. A single pipe 10 is sequentially fed into the assemble line 4 which is vacant, and the groove is aligned and temporarily attached.

As shown in FIGS. 1 and 11, the pipes shifted to the lengthening line 5 are permanently attached and lengthened by an automatic welding facility prepared in advance.

As shown in FIGS. 1 and 12, the lengthened pipe 11 is shifted to the main installation line 6 and welded to the end of the main installation pipe 12. After performing welding inspection and painting modification here,
The main pipe 1 placed on the roller bearing 7 by a jack
2 is pushed into the main guideway 1 for a length of 70 m. In parallel with this operation, in the lengthening line 5, the next pipe lengthening welding is carried out.

The above process is continuously repeated to lay a pipeline. In addition, FIG. 13 is a cross-sectional view of the main guideway 1.
4 shows a cross section of the vertical shaft 9.

The main pipe thus laid can be fixed by a well-known means such as a ring girder, but it can be fixed with good work efficiency while being placed on a conveyor such as a roller bearing.

That is, as shown in FIG. 15, from the lower both sides to the main pipe 12 placed and laid on the roller bearing 7,
Attached to the work floor 3 are two separate leg saddles 13 having an arcuate curved surface, and a band 14 on the upper side of the pipe.
The band 15 and the flange 15 extending from the saddle 13 are tightened with bolts, and the main pipe 12 is fixed to the leg saddle 13 while being placed on the roller bearing. If necessary, take measures such as fixing the roller with a blade or fixing it by welding, if the original function is no longer required.

The main pipe 12 placed on the tire support 7'and laid can be fixed as shown in FIG. In this case, two separate leg saddles 13, 13 each having an arcuate curved surface are fixed to the work floor 3 on both sides of the lower side of the main pipe 12, and the tire support 7'is deflated. Transfer the pipe load to the saddle 13. Next, attach the band 14 to the upper side of the pipe, and attach the band 14 and saddle 13 to the flange 1
5 and 15 are tightened with bolts, and the permanent pipe 12 is saddle 1
Fix at 3. After that, the tire bearing 7'is removed.

[0036]

As described above, the present invention has the following effects.

Since the single pipe pipe can be temporarily attached, lengthened, welded to the main pipe, and extruded from the main pipe to the main guide in the widening guide provided at the end of the main guide. , It is not necessary to have a large pipeline yard.

In the assembling line, the lengthening line and the main installation line in the widening guide, the steps of temporarily attaching the pipe single pipe, lengthening it, and extruding the main pipe can be performed continuously in parallel. The construction period can be shortened and pipes can be laid with good work efficiency.

The widening guideway or vertical shaft can be used as a space for operation and management of a valve station, a governor station (adjusting high pressure gas to medium pressure or low pressure gas), and the like.

According to the laying method of the second aspect, the influence on the ground facility or the traveling vehicle is only around the vertical shaft, and if the construction site of the vertical shaft is selected, the laying work can be performed without affecting them.

Conventionally, the piping work, which was performed on the main guideway with a narrow underground cavern, can be performed on the vertical shaft and the widening guideway with well-prepared working conditions. Therefore, high efficiency and rapid construction are possible.
Good conditions for quality and safety management.

According to the laying method of claim 3, the temporary attachment of the pipe single pipe in the assemble line, the extrusion of the main pipe in the main line and the main guide can be performed easily and accurately, and the work efficiency and the laying accuracy can be improved. Can be planned.

According to the laying method of claim 4, since the main pipe which is placed on the carrier and extruded and laid down is fixed while being placed on the carrier, the efficiency of the fixing work can be improved and the main pipe can be used as a temporary device. Can be effectively used.

According to the laying method of claim 5, the main pipe laid and laid on the tire bearing can be deflated and the load can be fixed to the saddle by fixing the tire, so that the fixing work can be efficiently performed and the tire bearing can be reused. It will be possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing a partial cross-section of a widening guideway in which a pipeline is laid on an open-cut guideway.

FIG. 2 is a cross-sectional view of the widening guide of FIG.

FIG. 3 is an explanatory diagram of a roller bearing including a taper roller.

FIG. 4 is an explanatory diagram of a roller bearing including parallel rollers.

FIG. 5 is an explanatory diagram of a tire bearing.

FIG. 6 is a perspective view of a shield starting shaft.

FIG. 7 is a perspective view of a widening guideway formed of a cave excavated by the shield method.

FIG. 8 is a perspective view of a permanent guideway that is a cavern that is excavated following the widening guideway.

FIG. 9 is a perspective view of a vertical shaft provided with a work floor.

FIG. 10 is a perspective view showing a step of sequentially feeding in a single pipe pipe that has been carried in to an assemble line and temporarily attaching it.

FIG. 11 is a perspective view showing a process of shifting a temporarily attached pipe to a lengthening line to make a long length of a final attachment.

FIG. 12 is a perspective view of a process of shifting an elongated pipe to a main line, welding the main pipe, and pushing the main pipe into a main conduit.

FIG. 13 is a standard cross-sectional view of the main guideway excavated by the shield method.

FIG. 14 is a sectional view of a vertical shaft.

FIG. 15 is a cross-sectional view of a permanent pipe fixed while being placed on a roller bearing.

FIG. 16 is a cross-sectional view showing a state in which the tire bearing is removed after the main pipe placed and laid on the tire bearing is fixed with a saddle.

[Explanation of symbols]

1 ... Main installation guideway, 2 ... widening guideway, 3 ... support base, 4 ...
Assemble line, 5 lengthening line, 6 permanent line, 7 roller support, 7 '... tire support, 8 ...
… Channel steel, 9 …… Vertical shaft, 10 …… Single pipe, 11 ……
Elongated pipe, 12 …… Permanent pipe, 13 …… Saddle,
14 ... band, 15 ... flange.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Okubo 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Satoshi Nagashima 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd.

Claims (5)

[Claims] 1. In the pipeline laying method, an assembling line, a lengthening line, and a widening guideway in which a mainline is sequentially arranged in parallel are provided at the end positions of the mainline of the pipeline. The main conduit is installed from the tip, and the pipe single pipe to be laid on the assemble line is temporarily attached to make it longer, then it is horizontally shifted and permanently welded on the elongated line, and then horizontally shifted to make it permanent. A pipeline laying method characterized in that a pipe is laid by continuously repeating welding to a main pipe end on a line and pushing it out to a main conduit by a jack. 2. The pipeline laying method according to claim 1, wherein a tunnel is excavated in the ground by a shield method to form a widening guideway and a main construction guideway, and the laying is started from a shield starting shaft at the base end of the widening guideway. A pipeline laying method characterized in that a single piece of power pipe is carried into the widening guideway. 3. The pipeline laying method according to claim 1, wherein a transport device is provided on the assemble line, the main line and the main guideway, and the pipe single pipe is temporarily placed on the transport device of the assemble line. A method of laying a pipeline, characterized in that an elongated pipe and a lengthened pipe and a permanent pipe are placed on a conveyor device of a main line and a main guide and pushed out. 4. The pipeline laying method according to claim 3, wherein the main pipe placed on the transfer device and pushed out to the main guide and laid is fixed while being placed on the transfer device. Construction method. 5. The pipeline laying method according to claim 3, wherein after the leg saddle is set up on the lower side of the main pipe which is placed on a conveying device composed of tire bearings and pushed out to the main guideway, the tire support is set up. The tire is deflated, the load of the main pipe is transferred to the leg saddle, the main pipe is fixed to the leg saddle, and the tire bearing is removed.