Anti-scouring and anti-impact device for marine pipeline

Abstract

The invention discloses an anti-scouring and anti-impact device for a marine pipeline. The anti-scouring and anti-impact device is composed of an external protective cover, an internal protective layer and a pipeline supporting mechanism. The outer protective cover adopts a double-arch-shaped frame, is axially fastened through transverse connecting beams to form a main bearing structure, and is matched with a plurality of longitudinal and transverse connecting ribs to form a three-dimensional grid frame through cross connection. Flow reducing holes are evenly formed in the surface of the inner protective layer to reduce the local flow speed, the interlayer is filled with anti-impact liquid, and impact energy is attenuated through the dual mechanisms of fluid shearing and hole energy consumption. The pipeline supporting mechanism comprises a supporting plate which is embedded with the pipeline in a conformal mode, and the supporting plate is rigidly connected with a connecting plate on the inner side of the transverse connecting beam through a connecting rod so as to effectively support the marine pipeline. The device resists scouring erosion through the rigid grid frame, absorbs dynamic impact in combination with the internal protection layer and provides supporting force in cooperation with the pipeline supporting mechanism, has the characteristics of vortex-induced vibration resistance, seabed emptying resistance and collaborative optimization of impact resistance, and can remarkably improve the comprehensive protection efficiency and prolong the service life of the submarine pipeline.

Description

Technical Field

[0001] The present invention belongs to the technical field of protection of marine pipeline facilities. Specifically, it relates to an anti-scouring and anti-impact device for marine pipelines. Background Art

[0002] Marine pipelines play a crucial role in the development of marine oil and gas resources. They are mainly used to transport crude oil and natural gas extracted from subsea oil and gas fields, and convey these resources to offshore platforms, onshore processing facilities or storage locations. They are the main means of transporting marine oil and gas resources and are a vital part of the entire marine oil and gas system.

[0003] In recent years, with the prosperity of international trade and fisheries, ship navigation and fishing boat operations have become increasingly frequent, and ship and fishing boat anchoring operations have occurred more frequently. In the vast majority of sea areas, the areas of ship navigation, fishing boat operations and the locations of marine pipelines overlap, which may cause impact damage to submarine pipelines during ship anchoring and dragging anchor operations. In addition, since the marine pipeline is located in the seabed environment, the ocean current in the seabed environment will cause local scouring of the marine pipeline, resulting in pipeline suspension, pipeline vibration, and even local bending or rupture of the pipeline.

[0004] Therefore, by using an anti-scouring and anti-impact device for marine pipelines, the impact of falling objects, dragging anchors, etc. on marine pipelines can be reduced, and at the same time, the scouring effect of ocean currents on marine pipelines can be decreased, ensuring the normal operation of marine pipelines. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides an anti-scouring and anti-impact device for marine pipelines, aiming to prevent damage to marine pipelines caused by falling objects, dragging anchors or trawl boards, and ensure the normal operation of marine pipelines.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An anti-erosion and impact device for marine pipelines, comprising: an external protective cover, including: an arched frame, two of the arched frames are arranged at intervals along the axial direction of the marine pipeline outside the marine pipeline, and the lower end of the arched frame is embedded in the seabed; transverse connecting ribs, a plurality of the transverse connecting ribs are fastened and connected between the two arched frames along the axial direction of the marine pipeline; transverse connecting beams, two of the transverse connecting beams are symmetrically arranged on both radial sides of the marine pipeline, and both ends of the two transverse connecting beams are respectively fastened and connected to the two arched frames, and the lower surfaces of the two transverse connecting beams are in parallel contact with the seabed surface; longitudinal connecting ribs, a plurality of the longitudinal connecting ribs are fastened and connected with the transverse connecting ribs and the transverse connecting beams along the radial direction of the marine pipeline to form a grid structure; an internal protective layer, which is a closed double-layer structure and is uniformly arranged on the inner surfaces of the transverse connecting ribs and the longitudinal connecting ribs, including: flow-reducing holes, a plurality of the flow-reducing holes are opened on the internal protective layer; anti-impact liquid, which is filled between the layers of the internal protective layer; a pipeline support mechanism, a plurality of groups of the pipeline support mechanism are arranged at intervals along the axial direction of the marine pipeline, and each group of the pipeline support mechanism includes two of the pipeline support mechanisms symmetrically arranged on both radial sides of the marine pipeline, and each of the pipeline support mechanisms includes: a pipeline support plate, which is conformally fitted with the marine pipeline to provide a supporting force for the marine pipeline; a connecting plate, which is fastened and connected to the inner side of the transverse connecting beam; a connecting rod, one end of the connecting rod is fastened and connected to the connecting plate, and the other end is fastened and connected to the pipeline support plate.

[0007] Preferably: The transverse connecting beam is a transverse I-beam, and the external protective cover further includes an outer baffle and a spring. The outer baffle is slidably installed in the outer groove of the transverse I-beam and is elastically connected to the central web of the transverse I-beam through a plurality of the springs.

[0008] Preferably: A plurality of flexible steel ropes are arranged on the inner side of the internal protective layer. At the same time, screw holes are opened on the arched frame, and eyebolt nuts are assembled on the screw holes. The flexible steel ropes are tied to the eyebolt nuts, and the flexible steel ropes are in a taut state transversely, so that the internal protective layer is pressed against the inner surfaces of the transverse connecting ribs and the longitudinal connecting ribs.

[0009] Preferably: A plurality of the flow-reducing holes are formed in the internal protective layer by drilling holes along the transverse direction, and the flow-reducing holes are tapered through holes with an outer hole diameter smaller than the inner hole diameter, and the flow-reducing holes are equally spaced from each other.

[0010] Preferably, the pipe support mechanism further includes an erosion prevention unit, on which an erosion prevention unit connection hole, a flow-facing side and a flow-back side are formed. At the same time, an erosion prevention unit connection position is formed on the pipe support plate. The erosion prevention unit connection hole is connected to the erosion prevention unit connection position, so that the erosion prevention unit is fixed between two adjacent pipe support plates. The flow-facing side is arranged outward and is a streamline curved surface, and the flow-back side is arranged inward and conforms to and fits with the subsea pipeline.

[0011] Preferably, the arched frame, the transverse connecting ribs, the longitudinal connecting ribs and the transverse connecting beams are all coated with a protective coating, and the protective coating uses epoxy resin paint.

[0012] Preferably, the impact-resistant liquid is an aqueous silica suspension, and the aqueous silica suspension is a shear thickening liquid. When in a stable state, it is a liquid, and when being extruded, its viscosity increases to form a solid-like impact-resistant layer.

[0013] Preferably, the inner protective layer is made of a polyethylene flexible protective material.

[0014] Preferably, the arched frame is an arched I-beam, the transverse connecting ribs are transverse round steel bars, and the longitudinal connecting ribs are longitudinal round steel bars.

[0015] Preferably, the transverse round steel bars are equally spaced from each other, and the longitudinal round steel bars are also equally spaced from each other.

[0016] Due to the above technical solutions adopted by the present invention, it has the following advantages: 1. The outer protective cover of the present invention adopts a steel structure. This structure has a smaller structural mass compared with the concrete-reinforced structure protection device, which is convenient for offshore installation and maintenance, and the impact resistance of the two is almost the same. This structure has a higher impact resistance and deformation resistance compared with the pure fiberglass protection device.

[0017] 2. The present invention is provided with an inner protective layer on the inner surface of the outer protective cover. When the outer protection device is severely deformed due to excessive impact of dropping or dragging an anchor, the inner protective layer will be extruded, the viscosity of the aqueous silica suspension increases, and the stiffness becomes larger. Its stiffness is even close to that of a solid, thereby preventing the outer protection device from being excessively deformed and enhancing the overall impact resistance of the device.

[0018] 3. The present invention forms an energy conversion structure through a flexible steel rope and a lifting eye bolt. When the device is impacted by an anchor drop or a falling object, the flexible steel rope has strong elasticity and can absorb part of the impact energy of the falling object. At the same time, since the flexible steel rope is tied to the lifting eye part of the lifting eye bolt and the lifting eye bolt is assembled with the screw hole, part of the impact load of the falling object will be converted into a lateral load on the arched I-beam through the lifting eye bolt, enabling the arched I-beam to absorb part of the impact load energy and enhancing the anti-impact energy of the device in the vertical direction.

[0019] 4. The present invention also provides an anti-erosion unit on the pipeline support mechanism. When ocean current erosion occurs, due to the direct existence of gaps between the pipeline support mechanisms, ocean current erosion of the pipeline soil may occur in each gap, causing local pipeline suspension and stress concentration. The upstream side of the anti-erosion unit can direct the oncoming flow in each gap in the vertical direction, avoiding the local pipeline suspension in the gaps between the pipeline support mechanisms. Brief Description of the Drawings

[0020] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 is a schematic structural diagram of the ocean pipeline anti-erosion and impact device provided by the present invention; Figure 2 is a schematic structural diagram of a partial arched I-beam provided by the present invention; Figure 3 is a schematic structural diagram of a lifting eye screw and a flexible steel rope provided by the present invention; Figure 4 is a schematic structural diagram of the anti-erosion unit provided by the present invention; Figure 5 is a schematic structural diagram of the pipeline support mechanism provided by the present invention; Figure 6 is a schematic cross-sectional structural diagram of the arched I-beam provided by the present invention; Figure 7 is a schematic cross-sectional structural diagram of the transverse I-beam provided by the present invention.

[0021] The reference numerals in the drawings are as follows: 1 - Outer protective cover; 2 - Inner protective layer; 3 - Pipeline support mechanism; 4 - Ocean pipeline; 5 - Protective coating; 11 - Arched I-beam; 12 - Transverse round steel; 13 - Longitudinal round steel; 14 - Transverse I-beam; 141 - Outer baffle; 142 - Spring; 21 - Flow reduction hole; 22 - Impact-resistant liquid; 23 - Flexible steel rope; 24 - Screw hole; 25 - Lifting eye bolt; 31 - Pipe support plate; 32 - Connecting rod; 33 - Connecting plate; 34 - Erosion prevention unit; 35 - Erosion prevention unit connection position 341 - Erosion prevention unit connection hole; 342 - Flow - facing side; 343 - Flow - back side Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the detailed implementation manners of the present invention with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present invention can be understood more thoroughly and the scope of the present invention can be fully communicated to those skilled in the art.

[0023] In the description of the present invention, it should be understood that the terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means more than two unless otherwise specifically defined.

[0025] In the present invention, unless otherwise clearly defined and limited, the terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0028] The anti-scouring and anti-impact device for marine pipelines provided by the present invention is composed of an external protective cover, an internal protective layer, and a pipeline support mechanism. The external protective cover adopts a double-arch frame and is axially fastened through a transverse connecting beam to form a main load-bearing structure, and is cross-connected with multiple longitudinal and transverse connecting ribs to form a three-dimensional grid frame. The internal protective layer is evenly provided with flow-reducing holes on the surface to reduce the local flow velocity, and an anti-impact liquid is filled between the layers, and the impact energy is attenuated through the dual mechanisms of fluid shear and hole energy consumption. The pipeline support mechanism includes a support plate that conforms to and fits the pipeline, and is rigidly connected to the inner connecting plate of the transverse connecting beam through a connecting rod to provide effective support for the marine pipeline. The device resists scouring erosion through a rigid grid frame, combines the internal protective layer to absorb dynamic impacts, and cooperates with the pipeline support mechanism to provide a support force, having the characteristics of synergistically optimizing the anti-vortex-induced vibration, preventing seabed scouring, and anti-impact performance, and can significantly improve the comprehensive protection efficiency and service life of submarine pipelines.

[0029] Next, the anti-scouring and anti-impact device for marine pipelines provided by the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0030] Please refer to Figure 1 , the anti-scouring and anti-impact device for marine pipelines provided by the present invention includes an external protective cover 1, an internal protective layer 2, and a pipeline support mechanism 3.

[0031] Please refer to Figure 1, the external protective cover 1 includes arch - shaped I - beams 11, transverse round steel bars 12, longitudinal round steel bars 13, and transverse I - beams 14. Two arch - shaped I - beams 11 are arranged at intervals along the axial direction of the marine pipeline 4 outside the marine pipeline 4, and the lower ends of the arch - shaped I - beams 11 are embedded in the seabed; multiple transverse round steel bars 12 are tightly connected between the two arch - shaped I - beams 11 along the axial direction of the marine pipeline 4, and the transverse round steel bars 12 are equally spaced; two transverse I - beams 14 are symmetrically arranged on both radial sides of the marine pipeline 4, and both ends of the two transverse I - beams 14 are tightly connected to the two arch - shaped I - beams 11 respectively, and the lower surfaces of the two transverse I - beams 14 are in parallel contact with the seabed surface; multiple longitudinal round steel bars 13 are tightly connected to the transverse round steel bars 12 and the transverse I - beams 14 along the radial direction of the marine pipeline 4 to form a grid structure, and the longitudinal round steel bars 13 are also equally spaced.

[0032] The internal protective layer 2 is a closed double - layer structure, which is evenly arranged on the inner surfaces of the transverse round steel bars 12 and the longitudinal round steel bars 13. A number of flow - reducing holes 21 are provided on the internal protective layer 2, and an impact - resistant liquid 22 is filled between the layers of the internal protective layer 2.

[0033] Please refer to Figure 1 、 Figure 5 and Figure 6 , multiple groups of pipeline support mechanisms 3 are arranged at intervals along the axial direction of the marine pipeline 4. Each group of pipeline support mechanisms 3 includes two pipeline support mechanisms 3 symmetrically arranged on both radial sides of the marine pipeline 4. Each pipeline support mechanism 3 includes a pipeline support plate 31, a connecting rod 32, and a connecting plate 33. The connecting plate 33 is tightly connected to the inner side of the transverse I - beam 14. One end of the connecting rod 32 is tightly connected to the connecting plate 33, and the other end is tightly connected to the pipeline support plate 31. The pipeline support plate 31 is conformally fitted with the marine pipeline 4 to provide a support force for the marine pipeline 4. Thus, when the oncoming flow scouring causes the silt under the marine pipeline 4 to flow away and the marine pipeline 4 becomes suspended, the pipeline support mechanism 3 can provide a support force for the marine pipeline 4 to prevent the marine pipeline 4 from vibrating due to suspension.

[0034] In the above - mentioned embodiment, preferably, please refer to Figure 6 , the external protective cover 1 further includes an outer baffle 141 and a spring 142. The outer baffle 141 is slidably installed in the outer groove of the transverse I - beam 14 and is connected to the central web of the transverse I - beam 14 through a number of springs 142. Through the above - mentioned setting, when the transverse I - beam 14 is subjected to transverse impacts such as anchor dragging and fishing gear trawling, the outer baffle 141 will compress the spring 142 to absorb the impact energy, prevent local depressions caused by transverse impacts, and cause the pipeline support mechanism 3 to displace. Thus, the transverse impact is prevented from directly acting on the marine pipeline 4.

[0035] In the above - mentioned embodiment, preferably, please refer to Figure 2 、 Figure 3, a plurality of flexible steel ropes 23 are arranged inside the inner protective layer 2. At the same time, screw holes 24 are formed on the inner web plate of the arch-shaped I-beam 11, and eyebolt 25 is assembled on the screw holes 24. The flexible steel ropes 23 are tied to the eyebolt 25, and the flexible steel ropes 23 are in a tensioned state horizontally. Thus, the inner protective layer 2 is pressed against the inner surfaces of the transverse round steel 12 and the longitudinal round steel 13. Through the above arrangement, when the device is impacted by an anchor drop or a falling object, due to the strong elasticity of the flexible steel ropes 23, part of the impact energy of the falling object can be absorbed; at the same time, because the flexible steel ropes 23 are tied to the eyebolt 25 fixed on the arch-shaped I-beam 11, part of the impact load of the falling object will be converted into a transverse load on the arch-shaped I-beam 11 through the eyebolt 25, so that the arch-shaped I-beam 11 absorbs part of the impact load energy, enhancing the anti-impact energy of the device in the vertical direction.

[0036] In the above embodiment, preferably, a plurality of flow-reducing holes 21 are formed in the inner protective layer 2 by drilling holes along the transverse direction, and the flow-reducing holes 21 are tapered through holes with an outer hole diameter smaller than the inner hole diameter, and the flow-reducing holes 21 are equidistantly distributed. Through the above arrangement, when the oncoming flow outside the device passes through the flow-reducing holes 21, the flow velocity is reduced, thereby reducing the scouring effect of the oncoming flow on the marine pipeline 4.

[0037] In the above embodiment, preferably, please refer to Figure 4 , the pipeline support mechanism 3 further includes an anti-scouring unit 34. An anti-scouring unit connection hole 341, a flow-facing side 342 and a flow-back side 343 are formed on the anti-scouring unit 34. At the same time, an anti-scouring unit connection position 35 is formed on the pipeline support plate 31. The anti-scouring unit connection hole 341 is connected to the anti-scouring unit connection position 35, so that the anti-scouring unit 34 is fixed between two adjacent pipeline support plates 31; the flow-facing side 342 faces outward and is a streamlined curved surface, and the flow-back side 343 faces inward and is conformally fitted with the marine pipeline 4. Through the above arrangement, when oncoming flow scouring occurs, due to the gaps between the pipeline support mechanisms 3, oncoming flow scouring of the pipeline soil may occur in each gap, causing local suspension of the marine pipeline 4 and stress concentration. The arc-shaped flow-facing side 342 in the anti-scouring unit 34 can direct the oncoming flow in each gap to the vertical direction, avoiding local suspension of the pipeline in the gaps between the pipeline support mechanisms 3.

[0038] In the above embodiment, preferably, please refer to Figure 6 、 Figure 7 , protective coatings 5 are applied on the surfaces of the arch-shaped I-beam 11, the transverse round steel 12, the longitudinal round steel 13 and the transverse I-beam 14. The protective coatings 5 are made of epoxy resin coatings, which not only have the functions of flexible energy absorption and corrosion resistance, but also, because the epoxy resin coatings belong to flexible materials, can slow down the action of impact loads.

[0039] In the above embodiments, preferably, the impact-resistant liquid 22 is an aqueous silica suspension, which is a shear thickening liquid and is in a liquid state in the stable state, so that the internal protective layer 2 has a smaller mass than the conventional flexible protective layer, facilitating installation and transportation at sea; when the external protective cover 1 undergoes severe deformation due to excessive impact from dropping or dragging an anchor, the internal protective layer 2 will be squeezed, and the viscosity of the aqueous silica suspension increases to form a quasi-solid-state impact-resistant layer, which can increase the stiffness of the material, prevent the material from deforming too much and failing, enhance the overall impact resistance of the device, and thus prevent the marine pipeline 4 from being subjected to impact loads.

[0040] In the above embodiments, preferably, the internal protective layer 2 is made of a polyethylene flexible protective material.

[0041] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An anti-erosion and anti-impact device for marine pipelines, characterized in that, Comprising: An external protective cover, including: An arch-shaped frame, with two of the arch-shaped frames arranged at intervals along the axial direction of the subsea pipeline outside the subsea pipeline, and the lower end of the arch-shaped frame is embedded in the seabed; Transverse connecting ribs, with multiple transverse connecting ribs fastened and connected between the two arch-shaped frames along the axial direction of the subsea pipeline; Transverse connecting beams, with two transverse connecting beams symmetrically arranged on both radial sides of the subsea pipeline, and both ends of the two transverse connecting beams are respectively fastened and connected to the two arch-shaped frames, and the lower surfaces of the two transverse connecting beams are in parallel contact with the seabed surface; Longitudinal connecting ribs, with multiple longitudinal connecting ribs fastened and connected to the transverse connecting ribs and transverse connecting beams along the radial direction of the subsea pipeline to form a grid structure; An internal protective layer, which is a closed double-layer structure and is uniformly arranged on the inner surfaces of the transverse connecting ribs and longitudinal connecting ribs, including: Flow reduction holes, with multiple flow reduction holes formed on the internal protective layer; Impact-resistant liquid, filled between the layers of the internal protective layer; Pipeline support mechanisms, with multiple groups of pipeline support mechanisms arranged at intervals along the axial direction of the subsea pipeline, and each group of pipeline support mechanisms includes two pipeline support mechanisms symmetrically arranged on both radial sides of the subsea pipeline, and each pipeline support mechanism includes: A pipeline support plate, which is conformally fitted with the subsea pipeline to provide a supporting force for the subsea pipeline; A connecting plate, fastened and connected to the inner side of the transverse connecting beam; A connecting rod, with one end of the connecting rod fastened and connected to the connecting plate and the other end fastened and connected to the pipeline support plate.

2. The anti-scouring and impact device for marine pipelines according to claim 1, wherein The transverse connecting beam is a transverse I-beam, and the external protective cover further includes an outer baffle and a spring. The outer baffle is slidably installed in the outer groove of the transverse I-beam and is elastically connected to the central web of the transverse I-beam through several springs.

3. The anti-erosion and anti-impact device for marine pipelines according to claim 1, wherein Multiple flexible steel ropes are arranged on the inner side of the internal protective layer. At the same time, screw holes are formed on the arch-shaped frame, and eyebolt nuts are assembled on the screw holes. The flexible steel ropes are tied to the eyebolt nuts, and the flexible steel ropes are in a tensioned state transversely, so that the internal protective layer is pressed against the inner surfaces of the transverse connecting ribs and longitudinal connecting ribs.

4. The marine pipeline anti-erosion and anti-impact device according to claim 1, characterized in that, Multiple flow reduction holes are formed in the internal protective layer by drilling holes along the transverse direction, and the flow reduction holes are tapered through holes with an outer hole diameter smaller than the inner hole diameter, and the flow reduction holes are equally spaced from each other.

5. The anti-erosion and anti-impact device for marine pipelines according to claim 1, characterized in that, The pipeline support mechanism further includes an anti-erosion unit. An anti-erosion unit connection hole, a flow-facing side and a flow-back side are formed on the anti-erosion unit. At the same time, an anti-erosion unit connection position is formed on the pipeline support plate. The anti-erosion unit connection hole is connected to the anti-erosion unit connection position, so that the anti-erosion unit is fixed between two adjacent pipeline support plates. The flow-facing side faces outward and is a streamlined curved surface, and the flow-back side faces inward and is conformally fitted with the subsea pipeline.

6. The anti-erosion and anti-impact device for marine pipelines according to claim 1, wherein The surfaces of the arch-shaped frame, transverse connecting ribs, longitudinal connecting ribs and transverse connecting beams are all coated with a protective coating, and the protective coating uses epoxy resin paint.

7. The anti-erosion and anti-impact device for marine pipelines according to claim 1, wherein The impact-resistant liquid is an aqueous silica suspension, which is a shear thickening fluid. It is in a liquid state in the stable state and its viscosity increases to form a quasi-solid impact-resistant layer when being extruded.

8. The anti-erosion and anti-impact device for marine pipelines according to claim 1, wherein The inner protective layer is made of a polyethylene flexible protective material.

9. The anti-erosion and anti-impact device for marine pipelines according to claim 1, wherein The arched frame is an arched I-beam, the transverse connecting bars are transverse round steel bars, and the longitudinal connecting bars are longitudinal round steel bars.

10. The anti-erosion and anti-impact device for marine pipelines according to claim 9, characterized in that, The transverse round steel bars are equally spaced from each other, and the longitudinal round steel bars are also equally spaced from each other.

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