KR100789986B1 - Method for laying pipe line on bottom of the sea - Google Patents

Abstract

Disclosed is a method of laying a subsea pipeline which can be easily constructed a subsea pipeline for supplying deep sea deep water to land.

Such a method of laying a subsea pipeline includes connecting a plurality of light pipes and forming a pole on the outer surface to form a pole tube having a certain length, and inserting a seal for sealing the pipes on both end sides of each pole tube. Sealing the inside, arranging the welding barge on the sea which is separated from the land by a certain distance, and placing the rod on the sea side from the land side so that one end is placed on the welding barge with the welding barge therebetween. And disposing the other pole tube so that one end is placed on the other side of the weld barge, pumping the pipe to settle below the sea level while the seawater flows into the one pole tube, and the welding rod line is placed thereon. Melting and joining one end of the two long pipes to each other, and Gradually extending the pipeline towards the land while joining and sedimenting the one end and the other long tubes.

Light weight pipe, long pipe, steel or concrete tarpaulin, welding barge, preliminary line, pipeline laying for intake of deep sea water, vacuum pump, work process and time shortening

Description

Method for laying pipe line on bottom of the sea}

The present invention relates to a method of laying a subsea pipeline, and more particularly, to a method of laying a subsea pipeline which can greatly shorten the construction process and time for supplying deep water in deep sea to land.

Pipe laying methods for supplying deep water in the deep sea are largely the Ray Barge Method, the Reel Barge Method, the seabed navigation method and the floating navigation method.

However, most of the above four methods require expensive equipment, and in particular, the following problems may occur when constructing a pipeline because the work process is complicated and the construction period is excessively required.

That is, in the deep depth of the installation (200 m to 500 m), the time to be affected by the algae and the wave is long, so the laying tube can be broken or easily deformed (eg, S-shaped or J-shaped).

For example, all four seasons are known to have deep seawater with a water temperature of 3 ° C or lower in the East Sea of Korea, and pipelines for water intake should be laid in the east direction. However, most of the tidal currents in the East Sea flow from 0.5 to 1.0 meters per second in the northwest to southeast directions. Therefore, in such an environment, it is difficult to lay a pipeline on the seabed of a large depth using the existing methods described above, and the laying time is excessive.

Moreover, in order to endure the environment in which algae and blue act as described above, not only expensive imported pipes such as polyethylene pipes with steel wires need to be used, but also large laying ships, crane ships, special equipment ships and pipes for stable operation. There is a problem in that the economic efficiency is significantly low because it must use a carrier.

In addition, since the lay pants method and the reel pants method use a large number of ships, a large number of workers are allowed to lay on board the ship, so most of the large size ships must be imported from foreign countries, and the daily fee is It will cost more than 100 million won, so you will have to pay excessive costs.

In addition, the seabed navigation method is to lay the pipeline while dragging the tubular body in a state in which friction with the seabed occurs, it is difficult to proceed smoothly in the installation area in the depth of approximately 200 to 500 meters.

The present invention has been proposed to solve the above problems,

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of laying a subsea pipeline which can be constructed in a state in which the work process and period can be greatly reduced without particularly using a large vessel or an expensive pipe.

In order to achieve the object as described above, the present invention,

Connecting a plurality of light pipes and installing a tarp on an outer surface to form a long pipe having a predetermined length;

Sealing the inside of the tube by inserting a pipe-sealing sealing device on both end sides of each of the long pipes;

Arranging a welding barge on the sea at a distance from the land;

Displacing the rod from the land side to the sea so that one end is placed on the weld barge with the weld barge therebetween;

Disposing the other pole tube so that one end is placed on the other side of the welding bar ship;

Pumping the pipe so that the pipe body is settled below the sea surface while the seawater flows into the one long side pipe;

Melting and joining one end of the two long pipes mounted on the weld barge;

Gradually extending the pipeline toward the land while joining and sedimenting one end of the melt-bonded long tube and another long tube;

Provides a method of laying the subsea pipeline comprising a.

As described above, the present invention can easily construct a pipeline for taking in deep sea water from the land while jointly joining a plurality of long pipes facing the land from the sea.

In particular, the present invention, the pipe length is gradually extended from the sea side toward the land while joining in the state where the one end of the pipe is settled to sink below the sea level by pumping the inside of the one long pipe before the joint joint of the respective long pipes. Proceed in such a way.

This pipeline laying method is simpler than the conventional laying method (lay pants method, reel pants method, subsea navigation method, floating navigation method) and can significantly shorten the time required for the work. . Therefore, it is possible to prevent as much as possible from damage or deformation (eg, S-shaped or J-shaped) in the seam section of the pipe due to algae or waves at the time of laying work.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Embodiments of the present invention are described to the extent that those of ordinary skill in the art can practice the present invention.

Therefore, since the embodiments of the present invention may be modified in various other forms, the claims of the present invention are not limited to the embodiments described below.

In the method of laying the subsea pipeline according to the embodiment of the present invention, first, the light pipe 1 having a constant diameter is connected to make a long pipe 4 as shown in FIG. 1.

The lightweight pipe 1 may be a pipe of a material that can float on water, for example, a high-density polyethylene pipe (HDPE) for water supply. This high density polyethylene tube is known to be excellent in elasticity, flexibility, toughness, corrosion resistance and easy handling. Therefore, it is suitable as the light pipe 1 for making the long pipe 4 of this invention.

The light pipe 1 is formed to have a length of about 12 meters or less to be transported by an automobile, and the state of the light pipe 1 becomes empty even when the inside of the pipe is empty or seawater is injected.

Therefore, it is possible to install a steel tarpaulin 2 of a predetermined weight as shown in Figs. 1 and 2 or to install a concrete tarpaulin 3 as shown in Fig.

The steel tarpaulin (2) or concrete tarpaulin (3) serves to control the floating (floating) and settling state of the light pipe (1).

In the iron tarpaulin (2) or concrete tarpaulin (3) is a state in which the tubular body floats on the water when the inside of the pole tube 4 is empty, and when the seawater is injected into the tubular body, the tubular body stably sinks to the sea bottom while moving under the sea surface. It is formed to have a weight that can be maintained.

The pole tube 4 connects a plurality of lightweight pipes 1 and inserts the iron or steel tarpaulin 2 or concrete tarpaulin 3 into an outer surface of the tubular body to form a single tube having a predetermined length as shown in FIG. 1.

That is, the pole tube 4 may be made while the operation of joining the light pipes 1 on the work platform 5 installed on land as in FIG. Although not shown in the drawings, such a joining operation is performed by joining in a conventional melt welding method with an electric fusion bonding socket (for example, an EF socket) connected between the light pipes 1, and the tube length is approximately 500 to 1,500 meters. Produce a tensile pipe (4).

Then, after the pole tube 4 is made, a process of sealing the inside of the tube is performed. This sealing operation proceeds by fitting the sealing device 7 for tube sealing inside the both ends of the said rod 4 as shown in FIG.

The hermetic sealing device 7 includes a cylindrical body 8 having a valve 9 as shown in FIG. 6, and the body 8 is made of a cylindrical rubber bag having elasticity and thus compressed air. It expands or contracts as it swells.

For example, when compressed air is injected into the body 8 through the valve 9, it expands, and when compressed air is discharged, it contracts (see FIG. 6).

Therefore, when the compressed air is injected in the state that the body 8 of the tube sealing device 7 is inserted into both ends of the pole tube 4, respectively, the body 8 expands and the pole tube as shown in FIG. 5. (4) can block the both ends of the tube body to maintain the sealed state.

When the manufacturing and sealing work of the pole tube 4 is completed as described above, the transfer operation of moving the pole tube 4 from land to sea is performed. This transfer operation is performed in the state which floated the welding bar ship 13 to the predetermined point of the sea for laying a subsea pipeline as shown in FIG.

The welding bar ship 13 is for proceeding to join the rods 4 on the sea, and to settle to the sea side, as shown in FIG. 7, a conventional melt welding machine 14 and a vacuum pump 15. And the generator 16 and the crane 17 are provided.

That is, the conveying operation of the pole tube 4, first, as shown in Figure 4 to roll the pole tube 4 over the launching platform 6 formed inclined on one side of the work platform 5 of the land to be suspended on the water.

Then, the end of the pole tube 4 is transferred to the point corresponding to the weld bar 13 by using the preliminary wire 12 in a state in which one end of the pole tube 4 is connected with the preliminary wire 12 by a wire rope. The pole tube 4 can be easily transported using a small preliminary line 12 having a small size since the inside of the tube body is sealed.

In addition, one end of the rod 4 may be further provided with a water intake port 11 having a shape as shown in FIG. 7. The intake port (11) serves to allow the seawater to smoothly flow into the tube through one end of the pole tube (4).

As described above, one end of the pole tube 4 carried by the preliminary line 12 is lifted by the crane 17 and placed as shown in FIG. 8 so as to be placed on the weld bar 13. In this state, the other end of the rod 4 is pumped to sink to the sea floor.

This pumping operation is to first remove the sealing device for the pipe sealing 7 fitted to the both ends of the long pipe (4) to release the sealing state, then the vacuum pump 15 and the long pipe ( 4) The vacuum pump 15 is driven with one end connected.

Then, while the seawater flows into the pipe through the other end side of the rod 4 by the pumping of the vacuum pump 15, the other side of the rod 4 is gradually settled down as shown in FIG. It sinks to the side.

According to this operation, the pole tube 4 is moved from the land side to the welding vessel 13 side, and then the whole for extracting the deep water while easily settling one side of the pole tube 4 toward the seabed ground 19 by pumping. Some sections of the pipeline can be easily formed. In addition, the pole tube 4 sunk in the seabed ground 19 side as described above can maintain a stable state by the weight of the steel tarpaulin (2) or concrete tarpaulin (3) even if algae occur.

When the above operation is completed, the other pole tube 4 is transferred to the preliminary line 12 so that one end thereof is placed on the opposite side of the weld bar 13 as shown in FIG. 9. At this time, the longitudinal direction of the tube of the pole tube 4 is located to face the land at sea.

In this state, the seal of one end of the other pole tube 4 is released, and then the one end of the two pole tubes 4 in the usual melt-bonding manner by using the welding machine 14 for welding on the weld pole 13. To each other.

Then, by using the crane 17 of the weld barge 13, the joining portion of the pole tube 4 is placed on the sea surface, and the weld barge 13 is formed of the other pole tube 4 as shown in FIG. It is moved to a point corresponding to the other end.

In addition, the inside of the tube is pumped by the vacuum pump 15 as described above in the state where the other end of the other pole tube 4 is placed on the welding bar wire 13.

Then, as the seawater flows into the tube body of the other long pipe 4 is settled on the seabed ground 19 side (see Fig. 10).

According to this operation, it is possible to form a pipeline section corresponding to the length of the two pole tube 4 pipe through the process of joining and pumping the two pole tube (4).

And, although not shown in the drawing, the entire section of the subsea pipeline for supplying the deep water of the deep sea to the land, while the other long pipes (4) in order to transport to the sea sequentially, and then bonded and pumped as described above, respectively You can easily install.

In particular, this laying method is, for example, because it can be quickly settled to the seabed ground 19 side by pumping the long pipe (4) from the land to the sea compared with the conventional known methods, for example, laying It is possible to prevent the damage and deformation as the pipe flows due to algae and waves during operation.

The method of laying the subsea pipeline according to the embodiment of the present invention described above, although not shown in the drawings other than the method of laying the pipe by floating one welding barge 13 on the sea as shown in Figure 6, the welding barge 13 You can also use 2 ships to carry out the laying work.

For example, when performing the pipe joining and pumping operation in one of the welding seams 13, the other welding seam 13 is transported from the land at a certain distance away from the welding seam 13 of the any one ship. The laying work can be carried out by arranging the other long pipe 4 in advance at the sea point where the seam can be joined and pumped. In this manner, the connection and extension work of the pipe can be carried out continuously, so that the time required for laying the pipeline can be further shortened.

In addition, the method of laying the subsea pipeline according to an embodiment of the present invention is not limited to the construction of a water intake pipe for supplying deep water in the deep sea to the land as described above.

For example, by installing submarine pipelines in the form of connecting land and islands to construct water and sewage pipelines, or by installing submarine pipelines in the form of connecting offshore oil fields, gas fields or oil tankers or gas lines with land. It can also be used for the construction of gas pipelines.

1 is a view for explaining the structure of the long pipe used in the method of laying the subsea pipeline according to an embodiment of the present invention.

It is a figure which shows the state which installed the steel stopper in the long pipe of FIG.

3 is a view showing a state in which a concrete stopper is installed in the long pipe of FIG.

4 is a view for explaining the operation of supplying the long pipe from the land to the sea when the installation work in the laying method of the subsea pipeline according to an embodiment of the present invention.

FIG. 5 is a view showing a state in which the inside of the long pipe of FIG. 4 is sealed with a sealing device for tube sealing.

6 is a view for explaining the detailed structure and operation of the sealing device for pipe sealing of FIG.

7 and 8 are views for explaining the operation of transferring the long pipe to the sea side welding bar when the installation work in the laying method of the subsea pipeline according to an embodiment of the present invention.

9 is a view for explaining an operation of pumping the inside of the long tube in the state of FIG. 8 and transporting and joining the other long tube.

FIG. 10 is a view for explaining an operation of joining another long pipe to pump two inside of the long pipe in FIG. 9 and extend toward the land.

Claims (1)

Connecting a plurality of light pipes and installing a tarp on an outer surface to form a long pipe having a predetermined length; Sealing the inside of the tube by inserting a pipe-sealing sealing device on both end sides of each of the long pipes; Arranging a welding barge on the sea at a distance from the land; Displacing the rod from the land side to the sea so that one end is placed on the weld barge with the weld barge therebetween; Disposing the other pole tube so that one end is placed on the other side of the welding bar ship; Pumping the pipe so that the pipe body is settled below the sea surface while the seawater flows into the one long side pipe; Melting and joining one end of the two rods placed on the weld barge; Gradually extending the pipeline toward the land while joining and sedimenting one end of the melt-bonded long tube and another long tube; Laying method of the subsea pipeline comprising a.

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