KR20200070608A - Complex protection pipe and offshore substructure and manufacturing method for complex protection pipe - Google Patents

Abstract

The present invention provides a composite protecting pipe, which includes: a pipe main body part which is hollow therein; a protecting pipe part forming a filling space with the pipe main body part and installed to surround the pipe main body part to protect the pipe main body part; and a gas injecting part installed to allow the filling space to communicate with the inside of the pipe main body part and forming a path through which gas is introduced and discharged in the filling space. Therefore, the composite protecting pipe can have greatly improved corrosion resistance.

Description

Composite protective pipe, marine support structure, and manufacturing method of composite protective pipe {COMPLEX PROTECTION PIPE AND OFFSHORE SUBSTRUCTURE AND MANUFACTURING METHOD FOR COMPLEX PROTECTION PIPE}

The present invention relates to a composite protective tube, a marine support structure, and a method for manufacturing a composite protective tube.

It should be noted that the contents described in this section merely provide background information about the present invention and do not constitute the prior art.

Each year, damage to industrial equipment due to corrosion and property damage are increasing, and a significant portion of these are known to be caused by marine corrosion.

This is because the ocean has a severely corrosive environment that is incomparable to that of the land, and in order to secure the durability for long life of the marine structure, it is necessary to understand the marine corrosive environment based on the understanding of the corrosive and anticorrosive measures for each structure. This is necessary.

That is, the conventional marine structure method has a short lifespan and requires frequent repairs, and a lot of expenses are consumed for such work. In the case of sea water, it is more corrosive than fresh water, which is mainly determined by the content of NaCl contained in sea water, and is characterized by exhibiting the strongest tendency to corrosive to metal at a concentration of 3.5 wt% of NaCl in sea water.

In Korea, the use of coastal sea space is planned and promoted in a manner similar to the recent technological development trends of developed countries, and this includes not only structures for the purpose of transportation of ships and mobile oil refining facilities, but also maritime airports, submarine tunnels, and seas. Offshore anchorage or offshore floating structures such as bridges and large port facilities are actively being produced or are in the planning stages.

Marine corrosion phenomena of structures exposed to the marine atmosphere include damage to marine structures and ships immersed in seawater, corrosion of machinery and piping materials that treat seawater for cooling and other industrial purposes, and corrosion by the marine atmosphere.

In the case of offshore structures that are expected to be developed in the next generation, most of them are large structures and require a long period of time from 50 to 100 years, so it is important to optimize existing methods and further develop new methods. Is becoming.

Steel pipe piles have excellent resistance to horizontal loads and can be easily connected by welding, so they are used steadily as the basis for port structures and bridges.

When steel pipe piles are used in marine environments, proper corrosion prevention is essential because they are susceptible to corrosion. Currently, there are various methods for processing various methods, and each has advantages and disadvantages.

In particular, for steel pipe composite piles that use sacrificial steel pipes as structural members in large-diameter cast-in-place piles, not only corrosion resistance but also economic efficiency are important factors.

In other words, the cost of anti-corrosion treatment should not exceed the economic benefit obtained by using the sacrificial steel pipe as a structural member.

Steel pipe piles are made in different forms depending on the shape of the seawater. The method of applying the sacrificial anode is applied to the part that is immersed in the seawater, and the coating method is applied to the splash zone and the sea area where the waves hit.

In the case of the sacrificial anode, since it is applied by calculating the anode consumption by the corrosion potential value, which is the inherent property of the applied steel, it can be said to be determined by which steel material is used as the steel pipe pile material, so there is no room for improvement, but it is a method of coating method There are many methods developed depending on the application site, performance and economics.

In Korea, the petrolatum method is the most commonly used method. This technique is a method in which the diver finishes the required part directly on the site after the construction of the steel pipe pile. Therefore, it is widely used as an advantage of excellent appearance quality and relatively long life, but it has the disadvantage that the construction cost is very high because it is a field construction method by divers.

In the case of overseas, the ultra-high corrosion-resistant coating method is widely used, mainly in Japan.

KR 10-1993-0002968 B1

The present invention, as an aspect, is to provide a composite protection pipe, a marine support structure, and a method for manufacturing a composite protection pipe, which can greatly improve corrosion resistance.

As an aspect of the present invention, an object of the present invention is to provide a composite protection pipe, a marine support structure, and a method for manufacturing the composite protection pipe, which can very easily evaluate the integrity of a welding line.

As one aspect for achieving the above object, the present invention is a hollow tube body portion inside; A protective pipe part which forms a filling space together with the tube body part and is installed to surround the tube body part to protect the tube body part; And a gas injection part installed to communicate the filling space with the inside of the tube body part and forming a path for drawing gas in and out of the filling space.

Preferably, the pipe body portion and the protective pipe portion are made of a metal material that can be welded to each other, and the protective pipe portion may be made of a material having a relatively high corrosion resistance compared to the pipe body portion.

Preferably, the pipe body portion is made of a steel material, the protective pipe portion is made of stainless steel, and the pipe body portion may have a relatively thick thickness compared to the protective pipe portion.

Preferably, the protective tube portion, stainless steel plate is bent, a stainless steel tube body is installed to surround the tube body portion is formed in the longitudinal welding line; And a circumferential welding line welded in the circumferential direction of the stainless tube body and the tube body portion to seal a filling space between the inner circumferential surface of the stainless tube body and the outer circumferential surface of the tube body portion.

Preferably, it is formed on at least an outer circumferential surface surrounded by the protective tube portion, a protective coating portion for protecting the tube body portion; may further include.

Preferably, the gas injection portion may be installed to penetrate from the inner circumferential surface to the outer circumferential surface of the pipe body portion.

Preferably, the gas injection portion may be installed to penetrate from the outer circumferential surface to the inner circumferential surface of the pipe body portion.

Preferably, the gas injection portion, a fastening bolt fixed to the injection hole of the tube body portion; And a gas injection pipe which is installed through the fastening bolt and communicates with the filling space inside the tube main body to form a gas inlet and outlet path.

Preferably, it is disposed between the injection hole of the tube body portion and the gas injection portion, while being deformed by the fastening pressure of the gas injection portion metal sealing portion sealing the gap between the injection hole and the gas injection portion; may further include a have.

As another aspect for achieving the above object, the present invention is a marine structure; And, a support pile penetrated into the seabed to support the offshore structure, wherein the support pile comprises at least a portion of the sea level surrounding the sea surface composed of the composite protection tube according to any one of claims 1 to 9. Provide a support structure.

Preferably, the composite protection tube may be provided with the protection tube portion over at least the entire splash zone where the ocean waves strike.

As another aspect for achieving the above object, the present invention is a method for manufacturing a composite protective tube according to any one of claims 1 to 9, wherein the pipe body portion, the protective pipe portion, and the gas injection portion Preparing parts preparation step; A gas injection part installation step of installing the gas injection part into the injection hole of the pipe main body after the parts preparation step; A protective tube part installation step of welding-welding the protective tube part so as to surround the tube body part; It provides a method for manufacturing a composite protection tube comprising; a welding line verification step of comparing the inflow and outflow of gas flowing into the filling space through the gas injection part to check the integrity of the welding line of the protection tube part.

Preferably, the method for manufacturing a composite protection pipe may further include a protective coating portion forming step of forming a protective coating portion on at least a portion of the outer circumferential surface of the pipe body portion surrounded by the protection pipe portion before the protection pipe portion installation step.

Preferably, the installation step of the protection tube portion, the roll bending step of controlling the shape by rolling the rolled stainless steel plate so as to surround the outer peripheral surface of the tube body portion; Forming a longitudinal welding line by welding both ends of the rolled stainless plate to form a stainless tube body; And forming a circumferential welding line by welding in the circumferential direction of the stainless tube body and the tube body portion to seal a filling space between the inner circumferential surface of the stainless tube body and the outer circumferential surface of the tube body portion.

According to an embodiment of the present invention as described above, there is an effect that corrosion resistance can be greatly improved.

According to one embodiment of the present invention, there is an effect that can be performed very easily to evaluate the integrity of the welding line.

1 is a perspective view of a composite protection tube according to an embodiment of the present invention.
2 is a cross-sectional view of a composite protection tube according to an embodiment of the present invention.
3 is a cross-sectional view of a composite protection tube according to another embodiment of the present invention.
4A and 4B are views showing before and after deformation of the metal sealing portion installed in the'A' portion of FIG. 3.
5 is a view showing a marine support structure to which a composite protection pipe according to an embodiment of the present invention is applied.
6 is a view showing a method of manufacturing a composite protective tube according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for a more clear description.

Hereinafter, a composite protective tube 10 according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6.

The composite protection pipe 10 according to an embodiment of the present invention includes a pipe body portion 100, a protection pipe portion 200, a gas injection portion 300, and additionally a protective coating portion 400, a metal sealing portion 500 ).

1 to 3, the composite protection tube 10 forms a filling space (S) together with the hollow tube body part 100 and the tube body part 100, and the tube body part ( 100) is installed so as to surround the tube body portion 100 to protect the tube 200, and the inside of the tube body portion 100 is installed to communicate with the filling space (S), the filling space ( S) may include a gas injection unit 300 to form a path for drawing gas in and out.

Referring to Figure 1, the tube body portion 100 may be composed of a tubular member extending in the longitudinal direction.

The pipe body portion 100 may be disposed inside the protective pipe portion 200, and the protective pipe portion 200 may surround the pipe body portion 100 and be installed in a partial region in the longitudinal direction.

In one example, the tube body portion 100 may be made of a steel material.

The protection pipe portion 200 is installed to surround the portion to be protected of the pipe body portion 100, so that the portion to be protected can be prevented from being corroded by salt water or the like.

The protective pipe part 200 may be formed of a corrosion-resistant material to prevent corrosion of the pipe body part 100.

In one example, the protection tube 200 may be made of stainless material.

2 and 3, the gas injection unit 300 is installed at least two or more through the tube body portion 100, it is possible to form a path for drawing gas into and out of the filling space (S). have.

Two gas injection parts 300 may be installed through the upper part and the lower part of the pipe body part 100.

A gas inlet line for introducing gas into the filling space S may be installed on one side of the two gas injection parts 300, and a gas outflow line through which gas is discharged from the filling space S may be installed on the other side.

For example, nitrogen gas may flow in and out of the filling space S through the gas injection unit 300.

Nitrogen gas may be introduced through one side of the two gas injection parts 300, and nitrogen gas may be discharged through the other side.

The composite protective tube 10 of the present invention checks the flow rate of the gas flowing into and out of the filling space S through the two gas injection parts 300, and compares them to each other, thereby leaking the gas flowing into the filling space S It is possible to evaluate whether or not this has the effect of evaluating the integrity of the welding line by a very simple method.

Of course, it may be considered to install the gas injection part 300 directly in the protection pipe part 200, but in this case, the gas injection part 300 made of a thin stainless steel sheet having a thickness in the range of 0.4 to 0.8 mm is installed. It is difficult, there may be problems such as having to penetrate the hole for installation and to fill the hole again later.

The pipe body portion 100 applied to the composite protective pipe 10 of the present invention is composed of a steel pipe, the protective pipe portion 200 is composed of a stainless pipe, and the pipe body portion 100 is relatively compared to the protective pipe portion 200 It can be configured to have a thick thickness.

In one example, the pipe body portion 100 is composed of a steel pipe having a thickness in the range of 12 to 20 mm, and the protective pipe portion 200 may be composed of a stainless pipe having a thickness in the range of 0.4 to 0.8 mm.

The composite protective tube 10 of the present invention is a gas injection portion 300 is pre-installed in the pipe body portion 100 composed of a steel pipe or the like, and in that there is no need to remove the gas injection portion 300, the gas There is no need to form a hole or the like in the protective pipe part 200, which is difficult to install the injection part 300, and there is no damage to the protective tube part 200, so that the durability of the composite protective tube 10 can be improved. .

The pipe body portion 100 and the protective pipe portion 200 are made of a metal material that can be welded to each other, and the protective pipe portion 200 is composed of a material having a relatively higher corrosion resistance than the pipe body portion 100. Can be.

For example, the pipe body portion 100 may be made of a steel material, and the protective pipe portion 200 may be made of a stainless material.

The composite protection tube 10 of the present invention is configured such that the protection pipe portion 200 surrounds the pipe body portion 100 to have corrosion resistance in a marine environment, so that the pipe body portion 100 is protected by the protection pipe portion 200 having strong corrosion resistance. As it is protected, it has the effect of having a long life span.

In addition, the composite protective tube 10 of the present invention can be subjected to a manufacturing process in a factory, so uniformity of quality is possible, and it can be transported to a construction site in a pre-made state in the factory, so that work can be performed, reducing the amount of work in the field. There is an effect that the workability can be improved.

2 and 3, the pipe body portion 100 is made of steel, the protective pipe portion 200 is made of stainless steel, and the pipe body portion 100 is the protective pipe portion 200 In comparison, it may have a relatively thick thickness.

The pipe body portion 100 is composed of a steel pipe made of a steel material such as steel, and the protective pipe portion 200 is welded and welded in a circumferential direction and a longitudinal direction between the pipe body portion 100 and the protective pipe portion 200. In the filling space (S) it can be formed.

In one example, the pipe body portion 100 is composed of a steel pipe having a thickness in the range of 12 to 20 mm, and the protective pipe portion 200 may be composed of a stainless pipe having a thickness in the range of 0.4 to 0.8 mm.

Of course, the protective pipe part 200 may be formed of a stainless tube including a longitudinal welding line 230 and a circumferential welding line 250.

Referring to Figure 1, the protection tube 200, stainless steel plate is bent, a stainless steel tube 210 and the stainless steel tube 210 is installed to surround the tube body portion 100 is formed with a longitudinal welding line 230 A circumferential welding line welded in the circumferential direction of the tube body 210 and the tube body part 100 to seal the filling space S between the inner circumferential surface of the stainless tube body 210 and the outer circumferential surface of the tube body part 100. 250 may be provided.

The stainless tube body 210 rolls a cut stainless plate so as to surround the outer circumferential surface of the tube body portion 100 to control the shape so that one side has a shape close to an open circular cross-section, and of the bent stainless plate. Both ends may be welded while forming the longitudinal welding line 230.

At this time, the longitudinal welding line 230 and the circumferential welding line 250 may be made of a material that is more resistant to corrosion than the pipe body portion 100, such as the protective pipe portion 200.

Glass fibers may be attached in the form of bonding around the longitudinal welding line 230.

Preferably, glass fibers having a width of 10 to 12 cm and a thickness of 2 to 2.5 mm may be attached to the periphery of the longitudinal welding line 230 along the longitudinal welding line 230.

A glass fiber having a width of 10 cm and a thickness of 2 mm may be attached to the periphery of the longitudinal welding line 230 along the longitudinal welding line 230 in a bonding form.

As an example, the welding method proceeds with GTAW (Gas Tungsten Arc Welding), and for girth welding and seam welding, dedicated welding rods are used, welding current is 100A and shielding gas is Ar 100%. It was prepared at a flow rate of 10 liters of division.

2 and 3, the composite protective tube 10 is formed on an outer circumferential surface surrounded by at least the protective tube part 200, and further includes a protective coating part 400 protecting the tube body part 100 can do.

The protective coating part 400 may be formed over at least the entire part surrounded by the protective tube part 200.

In the composite protection tube 10 of the present invention, the tube body part 100 is primarily prevented from corrosion by the coating coating of the tube body part 100 by the protective coating part 400, and the tube body part 100 is While being surrounded by a protective tube portion 200 made of a stainless material having strong corrosion resistance, corrosion is prevented in an overlapping manner, thereby improving durability.

Referring to FIG. 2, the gas injection part 300 may be installed to penetrate from the inner circumferential surface of the pipe body part 100 to the outer circumferential surface.

The gas injection part 300 is installed to penetrate in the direction of the filling space S from the inner circumferential surface of the tube main body part 100, and may form a gas inlet and outlet path to the filling space S.

In this case, there is an inconvenience in that the gas injection part 300 needs to be installed on the inner circumferential surface of the tube body part 100, but in the factory, the injection hole 110 is formed in the tube body part 100 in advance, and the tube body part 100 ), it is possible to improve the workability by reducing the amount of work in the field because the protective pipe part 200 can be transported to the construction site in a welding welding state in advance.

Referring to FIG. 3, the gas injection part 300 may be installed to penetrate from the outer circumferential surface of the pipe body part 100 to the inner circumferential surface.

The gas injection part 300 is installed to penetrate through the inner circumferential surface of the tube main body part 100 in the direction of the filling space S, and may form a gas inlet and outlet path to the filling space S.

In this case, it is possible to install the gas injection portion 300 in the injection hole 110 from the outside of the tube body portion 100 has an effect that can improve the workability of the operator.

4A and 4B, the gas injection part 300 is installed through a fastening bolt 310 and a fastening bolt 310 fixed to the injection hole 110 of the tube body part 100, A gas injection pipe 330 may be provided to communicate the inside of the pipe body portion 100 with the filling space S to form a gas inlet and outlet path.

The gas injection pipe 330 is installed through the inside of the pipe body portion 100 and the filling space S, and may form a path through which gas is drawn in and out.

The fastening bolt 310 is installed to surround the outside of the gas injection pipe 330, and may be fixed to the injection hole 110 of the pipe body portion 100.

4A and 4B, the fastening bolt 310 includes a fastening screw thread 311 coupled to a screw fastening area 111 of the injection hole 110 and a head fastening area of the injection hole 110. A head portion 313 for pressurizing and deforming the metal sealing portion 500 installed on the 113 may be provided.

4A and 4B, the composite protection tube 10 is disposed between the injection hole 110 and the gas injection part 300 and is deformed by the fastening pressure of the gas injection part 300. A metal sealing part 500 that seals between the injection hole 110 and the gas injection part 300 may be further included.

The metal sealing part 500 is disposed between the injection hole 110 and the fastening bolt 310, and is deformed by the fastening pressure of the fastening bolt 310, so that the injection hole 110 and the gas injection part ( 300) can be sealed.

The injection hole 110 is formed with a screw fastening region 111 to which the fastening screw 311 of the fastening bolt 310 is coupled, and a head fastening region 113 to which the head portion 313 of the fastening bolt 310 is coupled. Can be.

Referring to FIG. 4A, the metal sealing unit 500 may be pre-installed in the head fastening area 113 of the injection hole 110.

The metal sealing part 500 may be installed in the head fastening area 113 to have a tapered cross section that increases in cross section toward the outside in the circumferential direction of the head fastening area 113.

Referring to FIG. 4B, while the gas injection part 300 is fastened to the injection hole 110, at least the fastening bolt 310 is deformed while the fastening bolt 310 of the gas injection part 300 is deformed by pressing the metal sealing part 500. ) Between the head portion 313 of the injection hole 110 and the head fastening region 113 of the injection hole 110 to prevent gas leakage.

Of course, when the strength at which the gas injection part 300 is fastened to the injection hole 110 is strong, not only between the head portion 313 of the fastening bolt 310 and the head fastening area 113 of the injection hole 110 , As the deformed metal sealing part 500 flows into the screw fastening area 111, the gas is sealed by sealing the screw fastening thread 311 of the fastening bolt 310 together with the screw fastening area 111 of the injection hole 110. Leakage can be prevented.

Next, the marine support structure will be described in detail with reference to the drawings.

Referring to Figures, Figure 1, the marine support structure according to an embodiment of the present invention includes a marine structure (2), and a support pile (1), may additionally include a sacrificial anode device (5).

Referring to FIG. 5, a marine structure 2 of a marine support structure and a support file 1 which is penetrated into the submarine ground T and supports the marine structure 2 include the support file 1 , At least a portion of the sea level (U) around the composite protective tube 10 may be configured.

The offshore structure (2) is provided with a main structure (not shown) that is spaced apart from the sea surface (U) and a base plate (4) supporting the lower side of the present structure (not shown) and coupled with a support pile (1). can do.

As an example, the present structure (not shown) may be composed of a wind tower installed on the sea.

The base plate 4 may provide an installation portion of the main structure (not shown).

In one example, the base plate 4 is composed of a plate-shaped member of a reinforced concrete structure, and the upper portion of the support pile 1 is embedded in the base plate 4, and both can be fixed.

The supporting pile 1 may be composed of a steel pipe, and may be driven into the ground by being struck by a steering facility on the subsea ground T.

At this time, the support pile 1 may be composed of a steel pipe. At this time, the support pile 1 may be composed of a steel pipe having a thickness in the range of 12 to 20 mm.

Referring to Figure 5, the composite protective tube 10 may be installed around the sea level (U).

Here, the sea level (U) is a concept including a surface filled with salt water and a lake shore.

The composite protection pipe 10 is installed around the sea level U, and at least a part is installed to serve to improve the corrosion resistance of the support pile 1.

5, the offshore support structure is installed on the support pile 1, the sacrificial anode device 5 to prevent corrosion of the support pile 1 below the sea surface (U) may be installed.

The sacrificial anode device 5 may be installed on the outer circumferential surface of the support pile 1 by welding or the like in a circumferential direction.

The sacrificial anode device 5 may include at least one sacrificial anode that flows anticorrosive current to prevent corrosion of the support pile 1 located under the sea level U.

In one example, the composite protective tube 10 may be installed over the splash zone where the ocean waves.

The sacrificial anode device 5 is essential for salt water to prevent corrosion, and the sacrificial anode device 5 can prevent corrosion of the support pile 1 below the sea level U, but is periodically exposed to the air. In the case of the splash zone, there is a limit to prevent corrosion with the sacrificial anode device 5.

Therefore, the marine support structure of the present invention is a sacrificial anode device 5 below the sea surface (U) to prevent corrosion of the support pile (1), and around the sea surface (U) utilizing a composite protective tube (10) to support the pile (1) To prevent corrosion.

Referring to FIG. 5, in the composite protection tube 10, the protection tube part 200 may be installed over at least the entire splash zone where the ocean waves strike.

Here, the sea is a concept including a beach filled with salt water and a lake shore.

Splash zone refers to the range of water droplets when a wave hits a beach or a lake.

The composite protective tube 10 may be installed in a region including the upper end and the lowermost end of the splash zone at least where the salt water is in contact with the protection pipe part 200.

More preferably, the installation range of the protective tube 200 may include a splash zone, and may be installed up to a region spaced from 0.5 to 1.2 m from the upper end of the splash zone.

The protective pipe part 200 has no separate installation restrictions for the lower region of the splash zone, which is the zone in which the lower zone of the splash zone is immersed in salt water, such as seawater, and is supported by the sacrificial anode device 5 installed in the supporting pile 1. This is because corrosion of the tube body part 100 constituting (1) can be prevented.

Of course, a corrosion protection can be prevented by forming a coating layer in the sea area above the protective pipe part 200 of the support pile 1.

Since such a coating operation can be performed after the supporting pile 1 is struck and installed, unlike the case where the coating layer is formed before the struck, there is no problem that the coating layer is damaged, and there is an effect that the operation is easy at sea.

Of course, various embodiments of the composite protective tube 10 having various embodiments described above may be applied to the marine supporting structure of the present invention.

Accordingly, the structure of the pipe body portion 100, the protective pipe portion 200, the gas injection portion 300, the protective coating portion 400, the metal sealing portion 500, etc. of the composite protective pipe 10 used in the marine support structure Is the same as the configuration of the composite sheath 10 as already described, and a detailed description thereof will be omitted to avoid duplication.

Next, a method for manufacturing the composite protection tube 10 will be described in detail with reference to the drawings.

Referring to Figures, the manufacturing method of the composite protection pipe 10 according to an embodiment of the present invention is a part preparation step, a gas injection part 300 installation step, a protection tube part 200 installation step, and a welding line confirmation step It may include, and may additionally include.

The present invention is a method of manufacturing a composite protection pipe 10, after the component preparation step of preparing the pipe body portion 100, the protection pipe portion 200, and the gas injection portion 300, and after the component preparation step, The gas injection part 300 installation step of installing the gas injection part 300 in the injection hole 110 of the tube body part 100, and the protection pipe part 200 to surround the tube body part 100 The welding pipe of the protective pipe part 200 by comparing the inflow amount and outflow amount of the gas introduced into the filling space S through the gas injection part 300 and the installation step of the protection tube part 200 for welding welding. It may include a welding line check step for checking.

Referring to FIG. 3, the gas injection unit 300 installation step may be performed after the protection pipe unit 200 installation step.

That is, after the protective pipe portion 200 is welded to the pipe body portion 100, the gas injection portion 300 may be installed in the direction of the outer circumferential surface from the inner circumferential surface of the pipe body portion 100.

Referring to FIG. 4, the gas injection unit 300 installation step may be performed after the component preparation step.

That is, before the protective pipe part 200 is welded to the tube body part 100, the gas injection part 300 may be installed in the direction of the inner circumferential surface from the outer circumferential surface of the tube body part 100.

Before the protective tube 200 installation step, the injection hole 110 forming step of forming the injection hole 110 for the installation of the gas injection part 300 in the pipe body part 100 may be performed.

The manufacturing method of the composite protective pipe 10 is formed before the welding step of the protective pipe portion 200, the protective coating portion 400 is formed on at least a portion of the outer peripheral surface of the pipe body portion 100 surrounded by the protective pipe portion 200 It may further include the step of forming a protective coating 400.

The protective coating part 400 may be formed over at least the entire part surrounded by the protective tube part 200.

In the manufacturing method of the composite protective tube 10 of the present invention, the tube body part 100 is primarily prevented from corrosion by the coating coating of the tube body part 100 by the protective coating part 400, and the tube body part ( 100) is surrounded by a protective pipe portion 200 made of a stainless material having strong corrosion resistance, and has an effect of providing a composite protective pipe 10 capable of improving durability while preventing corrosion by overlapping.

The protective pipe 200 installation step is a roll bending step of controlling the shape by rolling the cut stainless plate so as to surround the outer circumferential surface of the pipe body portion 100 and the stainless tube body by welding both ends of the rolled stainless plate. The lengthwise welding line 230 forming step of forming 210, and welding in the circumferential direction of the stainless tube body 210 and the tube body part 100, the inner peripheral surface of the stainless tube body 210 and the tube body A circumferential welding line 250 forming step of sealing the filling space S between the outer circumferential surfaces of the unit 100 may be provided.

Of course, various methods of manufacturing the composite protective tube 10 having various embodiments described above may be applied to the method of manufacturing the composite protective tube 10 of the present invention.

Accordingly, the pipe body portion 100, the protective pipe portion 200, the gas injection portion 300, the protective coating portion 400, the metal sealing portion of the composite protective pipe 10 used in the manufacturing method of the composite protective pipe 10 ( The configuration of 500) is the same as that of the composite sheath 10, as already described, and a detailed description thereof will be omitted to avoid duplication.

Although the embodiments of the present invention have been described in detail above, the scope of rights of the present invention is not limited thereto, and it is possible that various modifications and variations are possible without departing from the technical spirit of the present invention as set forth in the claims. It will be obvious to those of ordinary skill in the field.

1: Support pile 2: Offshore structure
4: base plate 5: sacrificial anode device
10: composite protective tube 100: tube body part
110: injection hole 111: screw fastening area
113: head fastening area 200: protection tube
210: stainless steel tube 230: longitudinal welding line
250: circumferential welding line 300: gas injection part
310: fastening bolt 311: fastening screw
313: head portion 330: gas injection pipe
400: protective coating part 500: metal sealing part
S: Charging space T: Submarine ground
U: Sea level

Claims (14)

A hollow tube body part;
A protective pipe part which forms a filling space together with the tube body part and is installed to surround the tube body part to protect the tube body part; And,
It is installed to communicate the filling space with the inside of the tube body portion, and a gas injection part forming a path for drawing gas into and out of the filling space.
According to claim 1,
The tube body portion and the protective tube portion is composed of a metal material capable of welding joints,
The protective tube portion is a composite protective tube characterized in that it is composed of a material having a relatively high corrosion resistance compared to the tube body portion.
According to claim 1,
The tube body portion is made of steel, and the protective pipe portion is made of stainless steel,
The tube body portion composite protective tube characterized in that it has a relatively thick thickness compared to the protective tube.
According to claim 1, wherein the protection tube portion,
A stainless steel tube is bent to be installed to surround the tube body part in which a longitudinal welding line is formed; And,
And a circumferential welding line welded in the circumferential direction of the stainless tube body and the tube body portion to seal the filling space between the inner circumferential surface of the stainless tube body and the outer circumferential surface of the tube body portion.
According to claim 1,
It is formed on the outer circumferential surface at least surrounded by the protective tube portion, a protective coating portion for protecting the tube body portion; further comprising a composite protective tube.
According to claim 1, The gas injection unit,
A composite protective tube characterized in that it is installed to penetrate from the inner peripheral surface to the outer peripheral surface of the pipe body portion.
According to claim 1, The gas injection unit,
A composite protective tube characterized in that it is installed to penetrate from the outer circumferential surface of the pipe body portion to the inner circumferential surface.
According to claim 1, The gas injection unit,
A fastening bolt fixed to the injection hole of the tube body part; And,
It is installed through the fastening bolts, and the gas injection pipe to communicate the inside of the tube body portion and the filling space to form a gas inlet and outlet path.
According to claim 1,
And a metal sealing portion disposed between the injection hole of the tube body portion and the gas injection portion and sealing the gap between the injection hole and the gas injection portion while being deformed by a fastening pressure of the gas injection portion.
Offshore structures; And,
Includes; infiltrated into the seabed to support the marine structure;
The support file,
A marine support structure comprising at least a portion of the sea level surrounding the composite protective tube according to any one of claims 1 to 9.
The composite sheath of claim 10,
At least a marine support structure characterized in that the protective pipe portion is installed over the entire splash zone of the sea waves.
It is a manufacturing method of the composite protective tube according to any one of claims 1 to 9,
A component preparation step of preparing the pipe body portion, the protective pipe portion, and the gas injection portion;
A gas injection part installation step of installing the gas injection part into the injection hole of the pipe main body after the parts preparation step;
A protective tube part installation step of welding-welding the protective tube part to surround the tube body part;
Method of manufacturing a composite protection tube comprising; a welding line confirmation step of comparing the inflow and outflow of gas flowing into the filling space through the gas injection part to check the integrity of the welding line of the protection tube part.
According to claim 12, Before the protective tube installation step,
A method of manufacturing a composite protective tube further comprising a protective coating part forming step of forming a protective coating part on at least a portion of the outer peripheral surface of the tube body part surrounded by the protective tube part.
The method of claim 12, wherein the protective tube installation step,
A roll bending step of controlling a shape by roll-bending the cut stainless steel plate so as to surround the outer circumferential surface of the tube body part;
Forming a longitudinal welding line by welding both ends of the rolled stainless plate to form a stainless tube body; And,
A method of manufacturing a composite protective tube comprising: forming a circumferential welding line by welding in the circumferential direction of the stainless tube body and the tube body portion to seal a filling space between an inner circumferential surface of the stainless tube body and an outer circumferential surface of the pipe body part.

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