Porous grid type submarine pipe cable suspended span treatment spoiler device

Abstract

The invention discloses a porous grid type submarine pipe cable suspended span treatment spoiler device which comprises a base and a grid structure, the base is installed above the surface of a pipe cable and used for fixing the grid structure of a spoiler, the grid structure is composed of a grid bar arranged in the direction of the pipe cable and a plurality of grid plates perpendicular to the grid bar, and the grid plate is arranged on the base. And a plurality of round holes are formed in the grid bars and the grid plates. According to the porous grid type submarine pipe cable suspended span treatment spoiler device, incoming flows in different directions can be blocked through the grid structure, sediment sedimentation is promoted, the flow direction adaptability of the spoiler device is improved, a plurality of round holes are formed in the grid structure, small-scale vortexes are stimulated through the porous structure, the turbulence effect is enhanced, and the flow direction adaptability of the spoiler device is improved. The flow velocity adaptability of the spoiler device is improved, and sediment sedimentation and pipeline self-burying can be effectively promoted under the conditions of different flow velocities and flow directions.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering and submarine cable protection devices, in particular to a porous grid-type submarine cable suspension spanning management spoiler device. Background Art

[0002] The marine environment of submarine cables is complex. During service, they need to withstand loads such as internal pressure, gravity and temperature. At the same time, they may also face third-party damage such as collision, dragging and hook pulling by trawl fishing gear. Therefore, the suspended position of the cable is prone to fracture accidents, which will cause submarine oil and gas leakage, damage the marine ecological environment, and the suspension of the cable will cause losses. The causes of the suspension of submarine cables and the treatment of the suspension of cables are receiving more and more attention. The self-burying method of the cable with a spoiler uses the weight of the cable and the negative lift generated by the spoiler to cause the cable to sink into the scouring pit, so as to achieve the purpose of self-burying the cable and avoid the cable from being suspended. The spoiler consists of a fin plate and a base. The base is designed in an arc shape. Different sizes of arcs are designed according to different pipe diameters to match the outer diameter of the cable. The installed spoiler is not easy to loosen. The height of the fin plate is determined according to the water flow velocity and the seabed bottom. The larger the pipe diameter, the larger the size of the fin plate to ensure the strength of the fin plate. When rapid water flows through the spoiler, seawater diversion occurs, and the downward water flow scours the seabed, expanding the gap between the pipe bottom and the seabed, providing space for the pipes and cables to descend; the upward water flow exerts a downward force on the spoiler and the pipes and cables, and under the action of negative lift and the self-weight of the pipes and cables, the pipes and cables sink to the seabed, completing the self-burying process.

[0003] However, the traditional spoiler device requires that the ocean current velocity reaches a certain value and the flow direction is perpendicular or nearly perpendicular to the direction of the cable, which has the limitation of poor adaptability to flow velocity and flow direction. Summary of the invention

[0004] In view of these deficiencies, the present invention proposes a porous grid-type submarine cable overhang management spoiler device to improve the self-burying ability of the submarine cable and reduce the occurrence of overhang phenomenon.

[0005] To achieve the above objectives, the present invention proposes the following technical solutions:

[0006] A porous grid-type submarine cable suspension spanning spoiler device, characterized in that it comprises a base and a grid structure;

[0007] The base is installed just above the surface of the pipe and cable and arranged along the axis direction of the pipe and cable;

[0008] The grid structure is composed of a grid bar arranged along the axis of the cable and a plurality of grid plates perpendicular to the grid bar, and a plurality of circular holes are arranged on the grid bar and the grid plates.

[0009] Preferably, the grid bar is fixed directly above the base, and passes through the center line of the grid plate and is vertically connected thereto.

[0010] Preferably, the bottom of the grid plate is in an arc shape, the radius of the arc where the grid plate is located is equal to the radius of the pipe cable, and the angle of the arc where the grid plate is located is 180°±20°; the grid plates are equidistantly distributed at 1.5 times the diameter of the pipe cable.

[0011] Preferably, the opening ratio of the circular holes on the grid structure is 30±10%.

[0012] Preferably, the bottom of the base is in an arc shape, and the radius of the arc where the grid plate is located is equal to the radius of the pipe cable.

[0013] Preferably, the bars of the grid structure are flush with the tops of the grid plates.

[0014] Preferably, the material of the grid structure is PVC.

[0015] Preferably, chamfers are provided on the grid plate.

[0016] The present invention has the following beneficial effects:

[0017] (1) The porous grid-type submarine cable suspension control spoiler device can block the flow in different directions through the grid structure, promote sediment sedimentation, and improve the flow direction adaptability of the spoiler device. By arranging multiple circular holes on the grid structure, the porous structure is used to excite small-scale vortices, enhance turbulence, and improve the flow velocity adaptability of the spoiler device.

[0018] (2) The porous grid-type submarine cable suspension control spoiler device can effectively promote sediment sedimentation and pipeline self-burial under different flow velocity and flow direction conditions by adopting grid-type and porous spoiler structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a stereoscopic view of the porous grid type submarine cable suspension spanning spoiler device of the present invention.

[0021] In the figure: 1. base; 2. bars; 3. grid plates; 4. pipes and cables. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the embodiments of the present invention.

[0024] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0025] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0027] See also Figure 1 A porous grid-type submarine cable suspension management spoiler device comprises a base 1, which is installed just above the surface of the cable 4 and is used to fix the grid structure of the spoiler. The grid structure consists of a grid bar 2 arranged along the axis of the cable and a plurality of grid plates 3 perpendicular to the grid bar. The grid bar 2 and the grid plate 3 are both provided with a plurality of circular holes.

[0028] The grid bars 2 are arranged along the direction of the pipe cables 4, fixed just above the base 1, and pass through the center line of the grid plate 3 and are vertically connected thereto.

[0029] The bottom of the grating plate 3 is designed with an arc of corresponding size according to the base 1 and the pipe cable 4 diameter. The bottom of the grating plate is arc-shaped. The radius of the arc where the grating plate is located is equal to the radius of the pipe cable. The angle of the arc where the grating plate is located is 180°. The grating plates 3 are evenly distributed at 1.5 times the pipe diameter, and form a grid-like grid structure with the grid bars 2. The grid structure can adapt to the flow from different directions and promote sediment sedimentation.

[0030] A plurality of circular holes are provided on the grid bars 2 and the grid plates 3. The diameter of the circular holes and the opening form are set according to predetermined water flow conditions to stimulate small-scale eddies, enhance turbulence, promote sediment sedimentation and improve the self-burying effect of pipes and cables. In this embodiment, the opening rate of the circular holes on the grid structure is 30%.

[0031] The base 1 is an arc-shaped structure, and the curvature of the base 1 is designed to match the outer diameter of the pipe cable 4 to ensure the stability of the spoiler under high flow rate conditions and prevent loosening.

[0032] The heights of the bars 2 and the plates 3 of the grid structure are determined according to the water flow velocity and the seabed conditions, and the tops of the bars 2 and the plates 3 are flush.

[0033] The device of the present invention is installed by the following method:

[0034] (1) Determine the curvature of the base and the bottom of the grid plate according to the diameter of the pipe and cable; determine the length of the base and the grid bar according to the length of the pipe and cable;

[0035] (2) Weld the grid structure to the base; use bolts or high-strength binding tape to fix the base to the pipe and cable to ensure that the spoiler is not easy to loosen

[0036] (3) Use the negative lift generated by the weight of the umbilical cable and the spoiler to cause the umbilical cable to begin to sink; when the umbilical cable sinks to the vicinity of the scouring pit, observe the hanging condition of the bottom of the umbilical cable and use sandbags and / or gravel materials to backfill the scouring pit to suppress the swing of the umbilical cable.

[0037] During installation, the present invention uses its own weight and the negative lift generated by the spoiler to cause the pipe and cable to sink into the scouring pit. When the bottom of the pipe and cable is not suspended in the air, the method of using underwater support columns is too costly. Therefore, sandbags, gravel and other materials are used to backfill the scouring pit at the bottom of the pipe and cable to suppress the swing of the pipe and cable. The spoiler is composed of a base and a grid structure. The base is designed to be an arc shape. Because the base and the bottom of the grid structure are designed to have corresponding arcs according to the pipe diameter, matching with the shape of the pipe and cable can reduce the gap between the two, thereby improving the uniformity of the pressure distribution on the contact surface, so that the spoiler is not easy to be relatively displaced (loose) with the pipe and cable due to the impact of water flow. The height of the grid structure is determined according to the flow velocity of the water flow and the bottom quality of the seabed. The larger the pipe diameter, the larger the size of the grid structure to ensure the strength of the grid structure.

[0038] The grid structure is welded to the base, which is fixed to the pipe cable by bolts or high-strength binding tape. The spoiler is made of PVC material, which can reduce the impact of the trawl without breaking or tearing. At the same time, the upper end of the grid is chamfered to make its edge smooth to reduce entanglement with the fishing net.

[0039] The advantages of the present invention are: the present invention can block the incoming flow from different directions through the grid structure, promote sediment sedimentation, improve the flow direction adaptability of the spoiler device, and by setting a plurality of circular holes on the grid structure, the porous structure is used to excite small-scale eddies, enhance the turbulence effect, and improve the flow velocity adaptability of the spoiler device. When the water flows through the spoiler, seawater diversion occurs, and the downward water flow scours the seabed, expands the gap between the bottom of the pipe and the seabed, and provides a descending space for the pipeline; the upward water flow generates a downward force on the spoiler and the pipe cable, and the pipeline sinks into the seabed under the action of negative lift and the deadweight of the pipe cable, completing the self-burying process and preventing the pipe cable from being suspended in the air. When the incoming flow direction is different, the grid structure can block the incoming flow from different directions and promote seawater diversion; when the incoming flow velocity is small, the porous spoiler structure can excite small-scale eddies, increase turbulence, and promote sediment sedimentation.

[0040] An embodiment of the present invention is described in detail above, and the protection scope of the present invention should not be considered to be limited to the specific form described in the embodiment. All equivalent changes and improvements made according to the concept of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A porous grid-type submarine cable suspension control spoiler device, characterized in that: including a base and a grid structure; The base is installed just above the surface of the pipe and cable and arranged along the axis direction of the pipe and cable; The grid structure is composed of a grid bar arranged along the axis of the cable and a plurality of grid plates perpendicular to the grid bar, and a plurality of circular holes are arranged on the grid bar and the grid plates.

2. A porous grid-type submarine cable suspension control spoiler device according to claim 1, characterized in that: The grid bar is fixed right above the base, and passes through the center line of the grid plate and is vertically connected thereto.

3. A porous grid-type submarine cable suspension control spoiler device according to claim 2, characterized in that: The bottom of the grid plate is in an arc shape, the radius of the arc where the grid plate is located is equal to the radius of the pipe cable, and the angle of the arc where the grid plate is located is 180°±20°; the grid plates are equidistantly distributed at 1.5 times the diameter of the pipe cable.

4. A porous grid-type submarine cable suspension control spoiler device according to claim 3, characterized in that: The opening ratio of the circular holes on the grid structure is 30±10%.

5. A porous grid-type submarine cable suspension control spoiler device according to claim 4, characterized in that: The bottom of the base is in an arc shape, and the radius of the arc where the grid plate is located is equal to the radius of the pipe cable.

6. A porous grid-type submarine cable suspension control spoiler device according to claim 5, characterized in that: The bars of the grid structure are flush with the tops of the grid plates.

7. A porous grid-type submarine cable suspension control spoiler device according to claim 5, characterized in that: The material of the grid structure is PVC.

8. A porous grid-type submarine cable suspension control spoiler device according to claim 5, characterized in that: The grid plate is provided with a chamfer.

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