JP2765475B2 - Pipeline laying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a pipeline for oil or natural gas.

[0002]

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

[0003] In other words, to construct a pipeline yard, a site of about 150 m x 150 m is required at the end of the pipeline line, and H-shaped steel or the like is used so that the top end becomes a horizontal plane in a direction perpendicular to the pipeline. The sleepers are laid out at a pitch of about 5m.

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

[0005] The thus arranged single pipes are welded to form elongated pipes. After rolling and shifting this elongated pipe to the next line and performing welding inspection, it is further rolled and shifted to the next line to modify the weld coating.
The 00m long pipe is completed.

[0006] Elongated pipes corresponding to the entire length of the pipeline are sequentially constructed on site and stocked. That is, 5.
When laying a pipeline of 0 km, 50 long pipes will be stocked.

[0007] A wire is connected to the end of the elongated pipe,
Pull out with a winch installed on the opposite side of the strait. When one pipe is drawn out, that is, 100 m, the next long pipe is welded, inspected, modified for coating, etc., and then pulled out 100 m. By repeatedly drawing out the elongate pipe in units of such a process, a pipeline is laid to the opposite bank.

As described above, the conventional method requires a large pipeline yard for carrying a large number of single pipes, lengthening and stocking the pipes, and a crane truck traveling work area for laying the pipes.

[0009] In addition, as a method of laying a pipeline, a soil digging method and a shield method have been used, but there are problems in terms of influence on existing facilities, safety during pipeline construction, or work efficiency.

[0010] The earth retaining and digging method is a method of digging with a sheet pile digging over the entire line of the pipeline, performing welding, inspection, heavy-corrosion painting, jute winding, etc., and then burying the whole line with high-quality earth and sand. However, the temporary construction continues for a long time until the pipeline laying work is completed, and the effects on the facility itself and the traveling vehicles are inevitable.

When a tunnel is constructed by excavating a tunnel by a shield method, welding, inspection, corrosion protection, etc. are performed inside the guideway after the pipe is drawn into the guideway. The shield method does not affect facilities such as railways or roads and running vehicles except for the shaft. However, with the shield method, work efficiency is poor in narrow guideways.

In addition, a pipe suspended from the shaft at the entrance of the guideway is constructed to have a length sufficient for welding, inspection, anticorrosion, etc. in the shaft, and the pipes are sequentially pushed into the guideway. Although the shield method is better than the above method, the work efficiency is poor because the next work cannot be performed unless a series of joint work is completed.

[0013]

As described above, the conventional pipeline laying requires a large pipeline yard, influences on traveling vehicles by the earth retaining method, or work environment by the shield method. However, there were problems such as a decrease in work efficiency. The present invention has been made to solve these problems.

[0014]

According to a first aspect of the present invention, there is provided a pipeline laying method comprising the steps of:
At the end position of the pipeline main guideway, an assembling line, a lengthening line, and a widening guideway in which the main installation line are arranged in parallel are provided, and a main guideway is provided from the tip of the main installation line, and the assembling line Temporarily attaches a single pipe to be laid in, lengthens it, shifts it laterally, welds it permanently in the elongation line, and shifts it horizontally and welds it to the end of the pipe in the permanent line. The pipe is laid by continuously and repeatedly extruding the pipe into the main guideway.

According to a second aspect of the present invention, in the pipeline laying method according to the first aspect, a cave is excavated in the ground by a 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 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 assembling line, the main line and the main guiding path, and the single pipe is placed on the conveying device of the assembling line. In this method, the elongate pipe and the permanent pipe are placed on a transfer device of a permanent line and a permanent guideway and extruded. Claim 4 is the pipeline laying method according to Claim 3. The present invention is characterized in that a main pipe mounted on a transfer device and extruded and laid on a main guideway is fixed while being mounted on the transfer device.

According to a fifth aspect of the present invention, in the method of laying a pipeline according to the third aspect, the leg saddle is erected on the lower side of the main pipe which is mounted on a transport device including a tire bearing and extruded and laid on a main guideway. A pipeline and laying method characterized by bleeding tire air from a tire support, transferring the load of the main pipe to a leg saddle, fixing the main pipe to the leg saddle, and removing the tire support.

[0018]

FIG. 1 shows an example of digging a soil along a road embanked, providing a guideway, and laying a pipeline. At the end of the 3m wide pipeline main guideway 1, 6m wide and 70m long
The widening guideway 2 is constructed.

As shown in FIG. 2, a work floor 3 is provided on the bottom surface of the widened guideway 2, and an assembling line 4, an elongating line 5, and a permanent line 6 are provided in this order in parallel. The assemble line 4 and the permanent line 6 have the two lines shown in FIGS.
A pair of tapered rollers or roller bearings 7 composed of parallel rollers, or two pairs of tire bearings 7 'composed of tires are arranged in a straight line at intervals of 5 m to form a transport device. A plurality of channel steels 8 are laid on the lengthening line 5 in a direction perpendicular to the line at intervals of 20 m, and a sleeper is provided.

The main guideway 1 extends straight from the tip of the main line 6, and has a work floor and roller bearings (not shown) on the lower surface thereof, similarly to the main line.

Next, an embodiment in which a cave is excavated in the ground by a shield method to lay a pipeline with an inner diameter of 1.0 m inside a buried roadbed by a shield method is shown in FIGS. 6 to 12. It is explained along. 6 to 8, the portion of the widening guideway 2 is shown by a solid line for easy understanding, but is actually a cave excavated in the ground. 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 start shaft 9 (10.5) is constructed by soil excavation, underground continuous wall or caisson method.
mx 6m x 7.5m depth). As for the length in the axial direction of the shaft, the length of the fixed length pipe is 10 m, and the allowance for suspending the pipe is 0.5 m. The distance between the shafts is 5 to 10 km.
It is best if the shaft is placed inside the road floor, but it is unavoidable if some of the shaft is outside the site.

As shown in FIG. 7, a widened guideway 2 for working having an inner diameter of φ5 m × 70 m (extended) is manufactured.

This is also best if it is housed on the road floor, but it is unavoidable if some of it is outside the site.

As shown in FIG. 8, at the end of the widened guideway 2, a main guideway 1 having an inner diameter φ3m of a standard cross section is excavated. This will be built on the road floor.

Also in this embodiment, as shown in FIG. 9, a work floor 3 is provided on the widened guideway 2 and the main guideway 1, and although not shown, the widened guideway 2 has an assembling line,
The elongate line and the permanent line are arranged side by side in order. Roller bearings are arranged on the assemble line, the permanent line and the permanent guideway.

In order to lay a pipeline on the above-excavated guideway or a guideway consisting of a tunnel excavated by the shield method, the pipe single pipe 10 which has been subjected to heavy-corrosion protection with 10 cm in both ends is widened in advance. Carry in guideway 2. It is suspended from the shaft 9 and carried into the widening guideway 2 excavated by the shield method and provided in the ground.

As shown in FIG. 1, FIG. 2, and FIG. 10, the pipe single pipe 10 carried in is put on the roller bearing 7 on the assembling line 4 and sent out, and the groove between the single pipes 10 is successively aligned and temporarily attached. The running length is 70 m.

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

As shown in FIGS. 1 and 11, the pipe shifted to the elongation line 5 is subjected to permanent elongation welding by a previously prepared automatic welding equipment.

As shown in FIGS. 1 and 12, the elongated pipe 11 is shifted to the main line 6 and welded to the end of the main pipe 12. After performing welding inspection and painting modification here,
Main pipe 1 placed on roller bearing 7 by jack
2 is extruded 70 m into the main guideway 1. In parallel with this operation, in the lengthening line 5, the next pipe permanent lengthening welding is performed.

The above steps are continuously repeated to lay a pipeline. FIG. 13 shows a cross section of the main guideway 1 and FIG.
4 shows a section of the shaft 9.

The main pipe laid in this manner can be fixed by a well-known means such as a ring girder, but can be fixed with high work efficiency while being mounted on a transfer device such as a roller bearing.

That is, as shown in FIG. 15, a main pipe 12 placed and laid on the roller bearing 7 is attached from both lower sides thereof.
Attach two separate saddles 13, 13 having an arcuate curved surface on the work floor 3, and a band 14 on the upper side of the pipe.
Is attached, and the flange 15 protruding from the band 14 and the saddle 13 is tightened with bolts, and the main pipe 12 is fixed to the leg saddle 13 while being mounted on the roller bearing. Roller bearings for which the original function is no longer necessary may be subjected to measures such as fixing the rollers with blades or fixing them by welding as necessary.

The main pipe 12 placed and laid on the tire bearing 7 'can be fixed as shown in FIG. In this case, two separate leg saddles 13, 13 having arcuate curved surfaces on both lower sides of the main pipe 12 are fixed to the work floor 3 and stand up to release the tire air from the tire bearing 7 '. To transfer the pipe load to the saddle 13. Next, attach a band 14 to the upper side of the pipe, and attach the band 14 and the saddle 13 to the flange 1.
5 and 15 are tightened with bolts, and the main pipe 12 is saddle 1
Fix with 3. After that, the tire bearing 7 'is removed.

[0036]

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

In the widened guideway provided at the end of the main guideway, a single pipe can be temporarily attached, lengthened, welded to the main pipe, and pushed out to the main guideway. There is no need to provide a large pipeline yard.

In the assembling line, the lengthening line, and the main line in the widening guideway, the process of temporarily attaching a single pipe, lengthening, and pushing out the main pipe can be performed continuously and in parallel. The construction period can be shortened and pipes can be laid efficiently.

The widening guideway or shaft can be used as a space for operation and management of a valp station, a governor station (regulating 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 facilities or the traveling vehicles is only around the shaft, and if the construction site of the shaft is selected, the laying work can be performed without affecting them.

Conventionally, the plumbing work that has been performed on a narrow underground passageway with a narrow main road can be performed with a shaft and a widened guideway where work conditions are adjusted, so that high efficiency and rapid construction can be achieved.
Quality and safety management are also favorable conditions.

According to the laying method of the third aspect, it is easy and accurate to temporarily attach a single pipe in an assembling line and to push out a main pipe in a main line and a main guideway, thereby improving work efficiency and laying accuracy. Can be planned.

According to the laying method of the present invention, since the main pipe mounted on the transfer device and extruded and laid is fixed while being mounted on the transfer device, the efficiency of the fixing work can be improved, and the temporary device can be used as a permanent device. Can be used effectively.

According to the laying method of the present invention, the main pipe placed and laid on the tire support can be evacuated from the tire, and the load can be transferred to the saddle and fixed, so that the fixing work can be made more efficient and the tire support can be reused. It becomes possible.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the widened guideway of FIG. 1;

FIG. 3 is an explanatory view of a roller bearing composed of a tapered roller.

FIG. 4 is an explanatory view of a roller bearing composed of parallel rollers.

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

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

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

FIG. 8 is a perspective view of a main guideway which is formed by a caved tunnel following the widened guideway.

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

FIG. 10 is a perspective view illustrating a process of sequentially feeding and temporarily attaching the single pipes carried into the assembling line.

FIG. 11 is a perspective view showing a step of shifting a temporarily attached pipe to an elongation line and elongating the pipe.

FIG. 12 is a perspective view of a process of shifting an elongate pipe to a main line, welding to the main pipe, and extruding the main pipe.

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

FIG. 14 is a sectional view of a shaft.

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

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

[Explanation of symbols]

1 ... permanent guideway 2 ... widening guideway 3 ... support base 4 ...
... Assemble line, 5 ... Length line, 6 ... Main line, 7 ... Roller bearing, 7 '... Tire bearing, 8 ...
... Channel steel, 9 ... vertical shaft, 10 ... single pipe, 11 ...
Elongate pipe, 12 ... permanent pipe, 13 ... saddle,
14 ... band, 15 ... flange.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenji Okubo 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Satoshi Nagashima 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (56) References JP-A-63-189531 (JP, A) JP-A-61-248979 (JP, A) JP-A-4-281926 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) E02D 29/10

Claims (5)

(57) [Claims] In a pipeline laying method, a widened guideway in which an assembling line, a lengthening line, and a permanent line are sequentially arranged in parallel is provided at an end position of the pipeline permanent guideway. Provide a permanent guideway from the tip, temporarily attach a single pipe to be laid on the assembling line, lengthen it, shift it to the side, weld it on the lengthening line, shift it to the side, and install it further horizontally A pipe laying method characterized in that pipes are laid in such a manner that welding is continuously performed on a line to a main pipe end and then sequentially pushed out to a main guideway by a jack, thereby laying a pipe. 2. The pipeline laying method according to claim 1, wherein a cave is excavated in the ground by a shield method to form a widening guideway and a permanent guideway, and is laid from a shield start shaft at the base end of the widening guideway. A pipeline laying method characterized in that a single pipe to be piped is carried into a widening guideway. 3. The pipeline laying method according to claim 1, wherein a transport device is provided on the assembling line, the permanent line, and the permanent guideway, and the single pipe is placed on the transport device of the assembling line and temporarily. A method of laying a pipeline, wherein the length of the pipe is lengthened, and the lengthened pipe and the main pipe are placed on a conveying device of a main line and a main guideway and extruded. 4. The pipeline laying method according to claim 3, wherein the main pipe mounted on the transfer device and extruded and laid on the main guideway is fixed while being mounted on the transfer device. Construction method. 5. The method for laying a pipeline according to claim 3, wherein a leg saddle is erected on a lower side of a main pipe which is mounted on a transport device including a tire support and extruded and laid on a main guideway. A method of laying a pipeline, comprising bleeding tire air, transferring the load of the main pipe to the leg saddle, fixing the main pipe to the leg saddle, and removing the tire bearing.