Submarine pipeline protective cover and manufacturing method thereof

Abstract

The present invention belongs to the technical field of submarine pipeline protection, and in particular, relates to a submarine pipeline protection cover and a manufacturing method thereof. The submarine pipeline protection cover includes a plurality of protective covers and a plurality of horizontal connecting parts. The protective covers are bent to form a protective space for accommodating submarine pipelines. Semi-positioning protrusions are provided at opposite ends of the top surface of the protective cover; a first positioning groove is provided on the top surface of the horizontal connecting part; when two adjacent protective covers are spliced ​​in parallel, the two adjacent semi-positioning protrusions on the two adjacent protective covers form a complete positioning protrusion, the horizontal connecting part is sleeved on the two adjacent protective covers, and the complete positioning protrusion is positioned in the first positioning groove. In the present invention, the protective cover and the horizontal connecting part are both made of fiber material, which avoids seawater corrosion to the submarine pipeline protection cover, and the submarine pipeline protection cover is light in weight, which is convenient for laying the submarine pipeline protection cover and easy to disassemble and assemble.

Description

Technical Field

[0001] The present invention belongs to the technical field of submarine pipeline protection, and in particular relates to a submarine pipeline protection cover and a manufacturing method thereof. Background Art

[0002] Today, fully developing marine energy resources and utilizing ocean space are crucial means of ending energy crises and resource shortages. Subsea pipelines, for example, are the primary medium for transporting oil and gas. Ensuring the safety of submarine pipelines during operation is crucial for ensuring marine development. However, with the surge in human marine activities, some pipeline laying areas overlap with ship operating areas. Third-party activities, such as ship anchoring platform operations, inevitably lead to anchor-drop accidents. Once submarine trawl equipment impacts, overturns, or drags submarine pipelines and underwater facilities, the risk of damage to the pipelines increases significantly, causing environmental pollution and economic losses. Currently, protective structures for underwater oil and gas facilities primarily include steel structures and cement blocks. Steel structure protection has the following main drawbacks: its heavy form, high installation and resource requirements, and relatively complex design and manufacturing. In some projects, the added weight of steel protection has led to adjustments to the overall design and significantly increased transportation, installation, and construction costs. Furthermore, it is highly susceptible to corrosion in marine environments, with electrochemical corrosion being the most serious. While corrosion can be slowed using coatings and cathodic protection, these measures themselves can cause significant pollution to the marine environment and significantly increase project costs. Cement briquettes, while simpler in structure and more corrosion-resistant than steel, also have drawbacks, including limited versatility, stress concentration at pipe and cable end connection points, and heavy weight. Furthermore, traditional pipeline protection structures are large, making them difficult to transport and install, making construction difficult and increasing project costs. Furthermore, localized damage to traditional protection structures requires dismantling and replacing the entire structure, significantly increasing construction time and costs. Summary of the Invention

[0003] In view of the above problems, an embodiment of the present invention provides a submarine pipeline protective cover, comprising a plurality of protective covers and a plurality of horizontal connecting components, wherein the protective covers and the horizontal connecting components are both made of fiber-reinforced composite materials; the protective covers are bent to form a protective space for accommodating the submarine pipeline, and semi-positioning protrusions are provided at opposite ends of the top surface of the protective covers; and a first positioning groove is provided on the top surface of the horizontal connecting component;

[0004] When two adjacent protective covers are spliced ​​in parallel, the two adjacent half positioning protrusions on the two adjacent protective covers form a complete positioning protrusion, the horizontal connecting component is sleeved on the two adjacent protective covers, and the complete positioning protrusion is positioned in the first positioning groove.

[0005] Optionally, the protective cover is provided with first flanges on two opposite sides, and the horizontal connecting member is provided with second flanges on two opposite sides;

[0006] When two adjacent protective covers are parallelly spliced ​​through the horizontal connecting component, the second flange is attached to the first flange;

[0007] The submarine pipeline protection cover further includes a first pressing block installed on the first flange and / or the second flange.

[0008] Optionally, a first lifting ear hole is provided on the protective cover, and a second lifting ear hole is provided on the horizontal connecting component.

[0009] Optionally, the semi-positioning protrusion is a semicircular protrusion, and the first positioning groove is a circular groove.

[0010] Optionally, the submarine pipeline protective cover further comprises a corner connecting component made of fiber material, the corner connecting component comprising a first connecting plate and a second connecting plate connected to the first connecting plate, wherein a centerline of the first connecting plate and a centerline of the second connecting plate form a preset angle; and a top surface of each of the first connecting plate and the second connecting plate is provided with a second positioning groove adapted to the semi-positioning protrusion;

[0011] When two adjacent protective covers are spliced ​​at a preset angle, the first connecting plate and the second connecting plate are respectively sleeved on the two adjacent protective covers at the preset angle, and the semi-positioning protrusions on the first connecting plate and the second connecting plate are correspondingly positioned in the second positioning groove.

[0012] Optionally, the preset angle is 90 degrees.

[0013] Optionally, the protective cover is provided with first flanges on two opposite sides, the first connecting plate is provided with third flanges on two opposite sides, and the second connecting plate is provided with fourth flanges on two opposite sides;

[0014] When two adjacent protective covers are spliced ​​at a preset angle by the corner connecting component, the third flange and the fourth flange are both attached to the first flange;

[0015] The submarine pipeline protection cover further includes a second pressing block installed on the first flange and / or the third flange, and a third pressing block installed on the first flange and / or the fourth flange.

[0016] Optionally, a third lifting ear hole is further provided on the first connecting plate and / or the second connecting plate.

[0017] Optionally, the semi-positioning protrusion is a semicircular protrusion, and the second positioning groove is a semicircular groove adapted to the semicircular protrusion.

[0018] In the present invention, the protective cover can be covered on the pipeline on the seabed. The two adjacent half-positioning protrusions on the two adjacent protective covers form a complete positioning protrusion. The horizontal connecting component is sleeved between the two adjacent protective covers. The first positioning groove is sleeved on the complete positioning protrusion, thereby ensuring the accuracy of the docking between the connecting plates of the two adjacent complete positioning protrusions. The horizontal connecting component ensures the stability of the splicing of the two adjacent protective covers, preventing the waves, organisms, etc. on the seabed from disturbing the submarine pipeline protective cover. In addition, the protective cover and the horizontal connecting component are both made of fiber-reinforced composite materials. The protective cover and the horizontal connecting component are characterized by light weight, high strength, and stackability for transportation. The protective cover and the horizontal connecting component are highly designable and can be installed in different shapes corresponding to different parts of the submarine pipeline. They are also corrosion-resistant.

[0019] Another embodiment of the present invention further provides a method for manufacturing the above-mentioned submarine pipeline protective cover, comprising:

[0020] Prepare a mold having a mold cavity and a glue injection channel connected to the mold cavity, wherein the mold cavity is adapted to the protective cover or the horizontal connecting component;

[0021] Attaching a release cloth to the inner wall of the mold cavity, and attaching a vacuum bag to the release cloth;

[0022] Laying a lower layer of fiber cloth in the mold cavity, laying a plastic core material on the surface of the lower layer of fiber cloth, and laying an upper layer of fiber cloth on the surface of the plastic core material away from the lower layer of fiber cloth;

[0023] Injecting preset glue into the mold cavity through the glue injection channel so that the preset glue infiltrates the lower fiber cloth, the plastic core material, and the upper fiber cloth;

[0024] curing the lower fiber cloth, the plastic core material, and the upper fiber cloth in the mold cavity under a preset pressure, so that the lower fiber cloth, the plastic core material, and the upper fiber cloth form the protective cover or the horizontal connecting component after curing;

[0025] After the vacuum bag is inflated with gas, the protective cover or the horizontal connecting component is taken out from the mold cavity.

[0026] In the present invention, the manufacturing operation of the submarine pipeline protection cover is simple, and the outer surfaces of the protection cover and the horizontal connecting component are fiber cloth, and the interior is plastic core material, which has corrosion resistance and reduces its manufacturing cost.

[0027] In the present invention, the manufacturing operation of the submarine pipeline protection cover is simple, and the outer surfaces of the protection cover and the horizontal connecting component are fiber cloth, and the interior is plastic core material, which has corrosion resistance and reduces its manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and examples.

[0029] Figure 1 A schematic structural diagram of two adjacent submarine pipeline protection covers provided by one embodiment of the present invention when the protective covers are connected in parallel;

[0030] Figure 2 A schematic diagram of the protective cover structure of a submarine pipeline protective cover provided by one embodiment of the present invention;

[0031] Figure 3 A schematic structural diagram of the connecting components of a submarine pipeline protection cover according to one embodiment of the present invention is provided;

[0032] Figure 4 A schematic structural diagram of two adjacent protective covers connected at their corners according to an embodiment of the present invention;

[0033] Figure 5 A schematic structural diagram of a corner connection component of a submarine pipeline protection cover is provided for one embodiment of the present invention;

[0034] Figure 6 A schematic diagram of a mold provided by one embodiment of the present invention;

[0035] Figure 7 A schematic diagram of a method for manufacturing a submarine pipeline protective cover is provided according to an embodiment of the present invention.

[0036] The reference numerals in the specification are as follows:

[0037] 1. Protective cover; 11. Semi-positioning protrusion; 12. First flange; 13. First lifting ear hole; 2. Protective cover connecting component horizontal connecting component; 21. First positioning groove; 22. Second skirt flange; 23. Second lifting ear hole; 31. First pressure block; 32. Second pressure block; 33. Third pressure block; 4. Corner connecting component; 41. First connecting plate; 411. Third load-bearing plate; 42. Second connecting plate; 421. Fourth flange; 43. Second positioning groove; 44. Third lifting ear hole; 5. Mold; 51. Mold cavity; 52. Glue injection channel; 53. Release cloth; 54. Vacuum bag; 55. Lower fiber cloth; 56. Plastic core material; 57. Upper fiber cloth. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] It should be understood that the terms "upper", "lower", "left", "right", "front", "back", "middle", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0040] like Figures 1 to 3 As shown, one embodiment of the present invention provides a submarine pipeline protective cover, comprising multiple protective covers 1 and multiple horizontal connecting components 2. The protective covers 1 are bent to form a protective space for accommodating submarine pipelines. Semi-positioning protrusions 11 are provided at opposite ends of the top surface of the protective covers 1. A first positioning groove 21 is provided on the top surface of the horizontal connecting component 2. It is understood that the shapes of the protective covers 1 and the horizontal connecting component 2 can be designed according to actual needs. The protective covers 1 and the horizontal connecting component 2 are both made of fiber-reinforced composite materials. Fiber-reinforced composite materials are composite materials formed by winding, molding, or pultruding reinforcing fiber materials such as glass fiber, carbon fiber, and aramid fiber with a matrix material. Common fiber-reinforced composite materials are glass fiber reinforced composite materials (GFRP), carbon fiber reinforced composite materials (CFRP), and aramid fiber reinforced composite materials, depending on the reinforcing material. The length of the horizontal connecting component 2 is shorter than the length of the protective cover 1. The semi-positioning protrusions 11 include, but are not limited to, semicircular protrusions and elongated protrusions. It should be noted that the protective cover 1 and the horizontal connecting component 2 are integrally molded structural components.

[0041] When two adjacent protective covers 1 are joined in parallel, the two adjacent half-positioning protrusions 11 on the two adjacent protective covers 1 form a complete positioning protrusion, the horizontal connecting member 2 is sleeved onto the two adjacent protective covers 1, and the complete positioning protrusion is positioned in the first positioning groove 21. It can be understood that when the two adjacent protective covers 1 are joined in parallel front and back, the center lines of the two adjacent protective covers 1 coincide.

[0042] In the present invention, the protective cover 1 can be covered on the pipeline on the seabed, and the two adjacent semi-positioning protrusions 11 on the two adjacent protective covers 1 form a complete positioning protrusion. The horizontal connecting component 2 is sleeved between the two adjacent protective covers 1, and the first positioning groove 21 is sleeved on the complete positioning protrusion, thereby ensuring the accuracy of the docking between the connecting plates of the two adjacent complete positioning protrusions. The horizontal connecting component 2 ensures the stability of the splicing of the two adjacent protective covers 1, and prevents the waves, organisms, etc. on the seabed from disturbing the submarine pipeline protective cover. In addition, the protective cover 1 and the horizontal connecting component 2 are both made of fiber-reinforced composite materials. The protective cover 1 and the horizontal connecting component 2 have the characteristics of light weight, high strength, and can be stacked for transportation. The protective cover 1 and the horizontal connecting component 2 are highly designable and can be installed in different shapes corresponding to different parts of the submarine pipeline. They also have the characteristics of corrosion resistance.

[0043] In one embodiment, the protective cover 1 and the horizontal connecting component 2 both include an upper layer of fiber cloth, a lower layer of fiber cloth, and a plastic core material arranged between the upper layer of fiber cloth and the lower layer of fiber cloth; that is, the protective cover 1 and the horizontal connecting component 2 are both composed of an upper layer of fiber cloth, a plastic core material, and a lower layer of fiber cloth; the protective cover 1 and the horizontal connecting component 2 both have greater strength, better corrosion resistance, and are lighter in weight.

[0044] In one embodiment, if Figures 1 to 3 As shown, the protective cover 1 is provided with a first flange 12 on both sides relative to each other, and the horizontal connecting part 2 is provided with a second flange 22 on both sides relative to each other; it can be understood that the first flange 12 is provided on both sides of the left and right sides of the protective cover 1, and the first flange 12 is arranged horizontally; the second flange 22 is provided on both sides of the left and right sides of the horizontal connecting part 2, and the second flange 22 is arranged horizontally.

[0045] When two adjacent protective covers 1 are parallelly spliced ​​through the horizontal connecting component 2 , the second flange 22 is attached to the first flange 12 ; it can be understood that the two second flanges 22 are correspondingly attached to the top of the two first flanges 12 .

[0046] The submarine pipeline protective cover further includes a first pressing block 31 mounted on the first flange 12 and / or the second flange 22. It is understood that the first pressing block 31 includes, but is not limited to, cement blocks, etc., and multiple first pressing blocks 31 can be provided as needed. Multiple first pressing blocks 31 can be pressed against the first flange 12 and / or the second flange 22.

[0047] Specifically, the protective cover 1 is placed on the pipeline on the seabed, and the horizontal connecting component 2 is sleeved on two adjacent protective covers 1, and then the first pressing block 31 is pressed tightly on the first flange 12 and / or the second flange 22. The submarine pipeline protective cover has a simple structure and is easy to install.

[0048] In one embodiment, if Figures 1 to 3 As shown, the protective cover 1 is provided with a first lifting eye hole 13, and the horizontal connecting member 2 is provided with a second lifting eye hole 23. It can be understood that both the first lifting eye hole 13 and the second lifting eye hole 23 can be used to pass cables, so that the protective cover 1 and the horizontal connecting member 2 can be lifted to the seabed using a vessel equipped with cables, further improving the convenience of installing the horizontal connecting member 2.

[0049] In one embodiment, if Figures 1 to 3 As shown, the semi-positioning protrusion 11 is a semicircular protrusion, and the first positioning groove 21 is a circular groove. It can be understood that when two adjacent protective covers 1 are spliced ​​in parallel, the two adjacent semi-positioning protrusions 11 are spliced ​​into a complete circular protrusion, and the first positioning groove 21 is a circular groove adapted to the semicircular protrusion, and the circular groove can be snapped onto the circular protrusion formed by splicing the two semicircular protrusions.

[0050] In one embodiment, if Figure 4 and Figure 5 As shown, the submarine pipeline protective cover also includes a corner connecting component 4 made of fiber material. The corner connecting component 4 includes a first connecting plate 41 and a second connecting plate 42 connected to the first connecting plate 41. The centerline of the first connecting plate 41 and the centerline of the second connecting plate 42 form a preset angle. The top surfaces of the first connecting plate 41 and the second connecting plate 42 are each provided with a second positioning groove 43 that adapts to the semi-positioning protrusion 11. It is understood that the first connecting plate 41 and the second connecting plate 42 are integrally molded structural components. The preset angle between the first connecting plate 41 and the second connecting plate 42 can be designed according to actual needs, for example, the preset angle is designed to be 80 degrees, 90 degrees, 100 degrees, etc. Preferably, the preset angle is 90 degrees. Preferably, the semi-positioning protrusion 11 is a semicircular protrusion, and the second positioning groove 43 is a semicircular groove that adapts to the semicircular protrusion. It should be noted that the corner connecting component 4 is an integrally molded component, that is, the first connecting plate 41 and the second connecting plate 42 are integrally molded structural components.

[0051] When two adjacent protective covers 1 are spliced ​​at a preset angle, the first connecting plate 41 and the second connecting plate 42 are respectively sleeved on the two adjacent protective covers 1 at the preset angle, and the semi-positioning protrusions 11 on the first connecting plate 41 and the second connecting plate 42 are correspondingly positioned in the second positioning grooves 43. It can be understood that the pipelines on the seabed are not all distributed along a straight line, and the pipelines in some parts will bend. At this time, it is necessary to use a corner connecting component 4 to achieve the coverage of the bent pipeline. Specifically, first, the two protective covers 1 are respectively covered on the straight section of the bent pipeline, and then the corner connecting component 4 is used to cover the bent section of the bent pipeline, and the first connecting plate 41 and the second connecting plate 42 are respectively fitted on the two protective covers 1 at a preset angle, and at the same time, the two semi-positioning protrusions 11 are correspondingly embedded in the two second positioning grooves 43, thereby ensuring the stability of the corner connecting component 4 connected to the protective cover 1 at the preset angle.

[0052] In one embodiment, if Figure 4 and Figure 5 As shown, the protective cover 1 is provided with a first flange 12 on both sides relative to each other, the first connecting plate 41 is provided with a third flange 411 on both sides relative to each other, and the second connecting plate 42 is provided with a fourth flange 421 on both sides relative to each other; it can be understood that the protective cover 1 is provided with the first flange 12 on both sides, and the first flange 12 is horizontally arranged; the first connecting plate 41 is provided with the third flange 411 on both sides relative to each other, and the third flange 411 is horizontally arranged.

[0053] When two adjacent protective covers 1 are spliced ​​at a preset angle through the corner connecting component 4, the third flange 411 and the fourth flange 421 are correspondingly fitted on the first flanges 12 of the two protective covers 1; it can be understood that the two third flanges 411 are correspondingly fitted on top of the two first flanges 12, and the two fourth flanges 421 are correspondingly fitted on top of the two first flanges 12.

[0054] The submarine pipeline protective cover further includes a second pressing block 32 mounted on the first flange 12 and / or the third flange 411, and a third pressing block 33 mounted on the first flange 12 and / or the fourth flange 421. It is understood that both the second pressing block 32 and the third pressing block 33 include, but are not limited to, cement blocks, etc., and multiple second pressing blocks 32 and third pressing blocks 33 can be provided as needed. Multiple second pressing blocks 32 can be pressed against the first flange 12 and / or the second flange 22, and multiple third pressing blocks 33 can be pressed against the first flange 12 and / or the third flange 411.

[0055] Specifically, after the corner connecting component 4 is covered on the bent pipeline on the seabed, the second pressing block 32 is pressed against the first flange 12 and / or the third flange 411, and the third pressing block 33 is pressed against the first flange 12 and / or the fourth flange 421, thereby completing the covering work of the bent submarine pipeline and further improving the convenience of installation of the submarine pipeline protective cover.

[0056] In one embodiment, if Figure 5 As shown, the first connecting plate 41 and / or the second connecting plate 42 are further provided with a third lifting eye hole 44. It is understood that the third lifting eye hole 44 is for cables to pass through, so that the corner connecting component 4 can be lifted to the seabed using a vessel equipped with cables, further improving the convenience of the submarine pipeline protection cover.

[0057] like Figure 6 and Figure 7 As shown, another embodiment of the present invention further provides a method for manufacturing the above-mentioned submarine pipeline protective cover, comprising:

[0058] S100. Prepare a mold 5 having a mold cavity 51 and a glue injection channel 52 connected to the mold cavity 51, wherein the mold cavity 51 is adapted to the protective cover 1 or the horizontal connecting part 2; it can be understood that the mold cavity 51 is a structural part with an opening facing upward, and the mold cavity 51 is used to manufacture the protective cover 1 or the horizontal connecting part 2.

[0059] S200, attaching a release cloth 53 to the inner wall of the mold cavity 51, and attaching a vacuum bag 54 to the release cloth 53; it can be understood that the vacuum bag 54 is located between the release cloth 53 and the inner wall of the mold cavity 51, and the vacuum bag 54 is in a flat state.

[0060] S300, laying a lower layer of fiber cloth 55 in the mold cavity 51, laying a plastic core material 56 on the surface of the lower layer of fiber cloth 55, and laying an upper layer of fiber cloth 57 on the surface of the plastic core material 56 away from the lower layer of fiber cloth 55; it can be understood that the lower layer of fiber cloth 55 and the upper layer of fiber cloth 57 can be made of multiple fiber cloths bonded together, and the number of fiber cloth layers in the lower layer of fiber cloth 55 and the upper layer of fiber cloth 57 can be designed according to actual needs, for example, 20 layers, 30 layers and 40 layers are designed, etc., and the plastic core material 56 is located between the lower layer of fiber cloth 55 and the upper layer of fiber cloth 57.

[0061] S400, injecting preset glue into the mold cavity 51 through the glue injection channel 52, so that the preset glue infiltrates the lower fiber cloth 55, the plastic core material 56 and the upper fiber cloth 57; it can be understood that the preset glue can have the technical effect of bonding the lower fiber cloth 55, the plastic core material 56 and the upper fiber cloth 57 together.

[0062] S500, curing the lower fiber cloth 55, the plastic core material 56 and the upper fiber cloth 57 in the mold cavity 51 under a preset pressure, and forming the protective cover 1 or the horizontal connecting component 2 after curing. It can be understood that the mold 5 can be placed in a vacuum chamber for pressure maintenance, and after the preset pressure maintenance time, the lower fiber cloth 55, the plastic core material 56 and the upper fiber cloth 57 will automatically cure. When the mold cavity 51 is adapted to the protective cover 1, the lower fiber cloth 55, the plastic core material 56 and the upper fiber cloth 57 will be cured to form the protective cover 1; when the mold cavity 51 is adapted to the horizontal connecting component 2, the lower fiber cloth 55, the plastic core material 56 and the upper fiber cloth 57 will be cured to form the horizontal connecting component 2.

[0063] S600: After the vacuum bag 54 is inflated with gas, the protective cover 1 or the horizontal connecting component 2 is removed from the mold cavity 51. As will be appreciated, after the vacuum bag 54 is inflated with gas, the vacuum bag 54 expands and drives the protective cover 1 or the horizontal connecting component 2 out of the mold, allowing the molded protective cover 1 or the horizontal connecting component 2 to be removed from the mold cavity 51. Similarly, this manufacturing method can also be used to manufacture corner connecting components 4.

[0064] In the present invention, the manufacturing operation of the submarine pipeline protection cover is simple, and the outer surface of the protection cover 1 and the horizontal connecting component 2 is fiber cloth, and the interior is a plastic core material 56, which has corrosion resistance and reduces its manufacturing cost.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A submarine pipeline protection cover, characterized in that: The invention comprises a plurality of protective covers and a plurality of horizontal connecting parts, wherein the protective covers and the horizontal connecting parts are both made of fiber-reinforced composite materials; the protective covers are bent to form a protective space for accommodating submarine pipelines, and semi-positioning protrusions are provided at opposite ends of the top surface of the protective covers; and a first positioning groove is provided on the top surface of the horizontal connecting parts; When two adjacent protective covers are parallelly spliced, the two adjacent half positioning protrusions on the two adjacent protective covers form a complete positioning protrusion, the horizontal connecting member is sleeved on the two adjacent protective covers, and the complete positioning protrusion is positioned in the first positioning groove; The submarine pipeline protective cover further includes a corner connecting component made of fiber material, the corner connecting component including a first connecting plate and a second connecting plate connected to the first connecting plate, wherein the center line of the first connecting plate and the center line of the second connecting plate form a preset angle; the top surfaces of the first connecting plate and the second connecting plate are both provided with a second positioning groove adapted to the semi-positioning protrusion; When two adjacent protective covers are spliced ​​at a preset angle, the first connecting plate and the second connecting plate are respectively sleeved on the two adjacent protective covers at the preset angle, and the semi-positioning protrusions on the first connecting plate and the second connecting plate are correspondingly positioned in the second positioning groove.

2. The submarine pipeline protection cover according to claim 1, characterized in that: The protective cover is provided with first flanges on opposite sides, and the horizontal connecting member is provided with second flanges on opposite sides; When two adjacent protective covers are parallelly spliced ​​through the horizontal connecting component, the second flange is attached to the first flange; The submarine pipeline protection cover further includes a first pressing block installed on the first flange and / or the second flange.

3. The submarine pipeline protection cover according to claim 1, characterized in that: The protective cover is provided with a first lifting ear hole, and the horizontal connecting component is provided with a second lifting ear hole.

4. The submarine pipeline protection cover according to claim 1, characterized in that: The semi-positioning protrusion is a semicircular protrusion, and the first positioning groove is a circular groove.

5. The submarine pipeline protection cover according to claim 1, characterized in that: The preset angle is 90 degrees.

6. The submarine pipeline protection cover according to claim 1, characterized in that: The protective cover is provided with first flanges on opposite sides, the first connecting plate is provided with third flanges on opposite sides, and the second connecting plate is provided with fourth flanges on opposite sides; When two adjacent protective covers are spliced ​​at a preset angle by the corner connecting component, the third flange and the fourth flange are correspondingly attached to the first flanges of the two protective covers; The submarine pipeline protection cover further includes a second pressing block installed on the first flange and / or the third flange, and a third pressing block installed on the first flange and / or the fourth flange.

7. The submarine pipeline protection cover according to claim 1, characterized in that: The first connecting plate and / or the second connecting plate are further provided with a third lifting ear hole.

8. The submarine pipeline protection cover according to claim 1, characterized in that: The semi-positioning protrusion is a semicircular protrusion, and the second positioning groove is a semicircular groove adapted to the semicircular protrusion.

9. A method for manufacturing a submarine pipeline protective cover according to any one of claims 1 to 8, characterized in that: include: Prepare a mold having a mold cavity and a glue injection channel connected to the mold cavity, wherein the mold cavity is adapted to the protective cover or the horizontal connecting component; Attaching a release cloth to the inner wall of the mold cavity, and attaching a vacuum bag to the release cloth; Laying a lower layer of fiber cloth in the mold cavity, laying a plastic core material on the surface of the lower layer of fiber cloth, and laying an upper layer of fiber cloth on the surface of the plastic core material away from the lower layer of fiber cloth; Injecting preset glue into the mold cavity through the glue injection channel so that the preset glue infiltrates the lower fiber cloth, the plastic core material, and the upper fiber cloth; curing the lower fiber cloth, the plastic core material, and the upper fiber cloth in the mold cavity under a preset pressure, so that the lower fiber cloth, the plastic core material, and the upper fiber cloth form the protective cover or the horizontal connecting component after curing; After the vacuum bag is inflated with gas, the protective cover or the horizontal connecting component is taken out from the mold cavity.

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