A shallow water dynamic cable suspension structure with elastic anchoring system

Abstract

The utility model relates to the field of ocean engineering electrical system especially, more particularly to a kind of shallow water dynamic cable suspension structure with elastic anchoring system, including dynamic submarine cable, its outer surface is wrapped with buoyancy material, make the dynamic submarine cable suspend below water surface preset depth;Gravity block, is laid in seabed, for providing fixed anchor point;Elastic cable, two ends are respectively fixedly connected dynamic submarine cable and gravity block, make the dynamic submarine cable form non-linear space layout in horizontal plane, and in vertical direction and buoyancy material synergistic effect realizes the dynamic adaptation of submarine cable;Cable protection sleeve, is sleeved in the bending section of the dynamic submarine cable;Wherein, the elastic cable and the gravity block synergistic effect, limit the position deviation of the dynamic submarine cable.The above-mentioned shallow water dynamic cable suspension structure with elastic anchoring system can break through water depth limit and be applicable to 5-20 meters extremely shallow water.

Description

Technical Field

[0001] This utility model relates to the field of marine engineering electrical systems, and in particular to a shallow water dynamic cable suspension structure with an elastic anchoring system. Background Technology

[0002] Marine dynamic cables are key equipment used to connect floating structures at sea to submarine facilities or land-based power grids, and must maintain stable power or signal transmission in dynamic marine environments.

[0003] Currently, traditional deployment schemes typically construct dynamic cable bending profiles vertically. However, for the specific working conditions of extremely shallow waters (5-20 meters), existing offshore dynamic cable technologies have significant limitations. For example, in waters shallower than 30 meters, traditional catenary configurations cannot form naturally gradual curves due to insufficient water depth. Calculations show that when the water depth is ≤20 meters, the bending radius of traditional schemes is forced to decrease to 3-5 times the cable diameter. However, the "Recommended Code for Submarine Cable System Design" (DNVGL-RP-0360) requires a minimum bending radius of ≥10×D for dynamic cables, leading to excessive bending of the dynamic cable and subsequent structural damage such as sheath wrinkling and armor fatigue. Wave and tidal changes are more frequent and intense in extremely shallow waters, making it difficult for the rigid fixing system of traditional deployment schemes to effectively absorb dynamic loads. Long-term exposure to this environment can easily cause fatigue damage to the dynamic cable, reducing its service life. In extremely shallow waters (less than 15 meters), traditional deployment schemes cannot maintain sufficient suspension height, causing the dynamic cable to come into contact with and rub against the seabed at low tide. Utility Model Content

[0004] The problem this utility model aims to solve is to provide a shallow-water dynamic cable suspension structure with an elastic anchoring system that overcomes the above-mentioned shortcomings and is suitable for extremely shallow waters of 5-20 meters. The technical solution is as follows:

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is: a shallow water dynamic cable suspension structure with an elastic anchoring system, comprising:

[0006] A dynamic submarine cable, the outer surface of which is covered with buoyancy material, so that the dynamic submarine cable is suspended at a predetermined depth below the water surface;

[0007] Gravity blocks, placed on the seabed, are used to provide fixed anchor points;

[0008] The elastic cable is fixedly connected to the dynamic submarine cable and the gravity block at both ends, so that the dynamic submarine cable forms a non-linear spatial layout in the horizontal plane and works in conjunction with the buoyancy material in the vertical direction to realize the dynamic adaptation of the submarine cable.

[0009] A cable protection sleeve is fitted onto the curved section of the dynamic submarine cable;

[0010] The elastic cable and the gravity block work together to limit the positional displacement of the dynamic submarine cable.

[0011] In one embodiment, the elastic cord is composed of a UHMWPE fiber core layer and a neoprene rubber outer layer.

[0012] In one embodiment, the gravity block is a steel fiber reinforced concrete structure.

[0013] In one embodiment, the cable protection sleeve is made of three-layer co-extruded HDPE material.

[0014] In one embodiment, the buoyancy material includes a linear low-density polyethylene or high-density polyethylene rotational molding shell, and EPS foam or polyurethane foam filled within the shell, with an overall density of 0.4~0.6 g / cm³.

[0015] In one embodiment, the non-linear spatial layout is a curved topology, including a catenary or a segmented smooth curve, wherein the radius of curvature of the curved topology is ≥10 times the dynamic submarine cable diameter.

[0016] In one embodiment, the surface of the gravity block is provided with a shear key structure.

[0017] Compared with existing technologies, the beneficial effects of this utility model are as follows: By constructing a dynamic submarine cable profile on the horizontal plane, the problem of insufficient bending radius in extremely shallow waters of 5-20 meters for traditional vertical catenary configurations is effectively solved, ensuring that the bending radius of the dynamic submarine cable meets the specifications and avoiding structural damage such as sheath wrinkles and armor fatigue; the flexible fixing system using elastic cable-gravity blocks can effectively absorb the frequent and severe wave and tidal loads in extremely shallow waters and limit the positional deviation of the dynamic submarine cable, significantly reducing the dynamic strain amplitude compared with traditional rigid fixing systems and extending the service life of the submarine cable; by precisely controlling the suspension depth of the submarine cable through buoyancy materials, sufficient suspension height can still be maintained in extremely shallow waters of ≤20m, and a locally reinforced protective sleeve is provided in the bending section of the dynamic submarine cable, effectively solving the problem of bottom wear of traditional vertical catenary configurations in extremely shallow waters. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a top view of a shallow-water dynamic cable suspension structure with an elastic anchoring system according to one embodiment.

[0020] Figure 2 This is a side view of a shallow-water dynamic cable suspension structure with an elastic anchoring system according to one embodiment.

[0021] Reference numerals: 1: Dynamic submarine cable; 2: Gravity block; 3: Elastic cable; 4: Cable protection sleeve; 5: Buoyancy material. Detailed Implementation

[0022] To facilitate understanding of this utility model, the following description will be more comprehensive and detailed in conjunction with the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0023] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0024] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0025] Please see Figure 1-2 One embodiment of a shallow-water dynamic cable suspension structure with an elastic anchoring system mainly includes: a dynamic submarine cable 1, gravity blocks 2, elastic cables 3, and a cable protection sleeve 4. The outer surface of the dynamic submarine cable 1 is wrapped with buoyancy material 5, allowing the dynamic submarine cable 1 to suspend at a predetermined depth below the water surface. Gravity blocks 2 are arranged on the seabed at required intervals to provide fixed anchor points. The dynamic submarine cable 1 and gravity blocks 2 are fixedly connected at both ends of the elastic cables 3, forming a non-linear spatial layout of the dynamic submarine cable 1 in the horizontal plane, and working in conjunction with the buoyancy material 5 in the vertical direction to achieve dynamic adaptation of the submarine cable. The cable protection sleeve 4 is fitted onto the curved section of the dynamic submarine cable 1 to improve the local bending stiffness of the dynamic submarine cable 1. The elastic cables 3 and gravity blocks 2 work together to limit the positional displacement of the dynamic submarine cable 1. Specifically, the gravity block 2 forms an elastic constraint on the dynamic submarine cable 1 in the horizontal direction through the elastic cable 3, which maintains the preset line shape and allows limited displacement under the action of waves and ocean currents. It also provides a buffer force in the vertical plane to absorb the vertical movement caused by waves and allows the dynamic submarine cable 1 to return to the initial position when the external force is removed.

[0026] Specifically, the elastic cord 3 is composed of a UHMWPE fiber core layer and a neoprene rubber outer layer. Preferably, the fiber core layer has a strength ≥22 cN / dtex, and the neoprene rubber outer layer has a thickness of 3 mm.

[0027] Specifically, gravity block 2 is a steel fiber reinforced concrete structure. Preferably, the concrete gravity block 2 has a compressive strength ≥ 50 MPa, a single block size of 5000 mm × 5000 mm × 1000 mm, and a horizontal ultimate bearing capacity ≥ 500 kN.

[0028] Preferably, the cable protection sleeve 4 is made of three-layer co-extruded HDPE material with a wall thickness of 12mm, a melt flow index of 0.15g / 10min, and a bending fatigue resistance of ≥5000 cycles (ISO 13628 standard).

[0029] Specifically, the buoyancy material 5 includes a linear low-density polyethylene or high-density polyethylene rotomolded shell, and EPS foam or polyurethane foam filled inside the shell, with an overall density of 0.4~0.6 g / cm³, so that the dynamic submarine cable 1 is suspended in the depth range of 5-20 meters below the water surface.

[0030] Specifically, the non-linear spatial layout is a curved topology, including catenaries or segmented smooth curves, with the radius of curvature of the curved topology being ≥10 times the diameter of the dynamic submarine cable.

[0031] Preferably, the surface of the gravity block 2 is provided with a shear key structure to enhance the anchoring stability with the seabed.

[0032] The method of using the above-mentioned shallow-water dynamic cable suspension structure with elastic anchoring system is as follows: First, wrap the dynamic submarine cable 1 with buoyancy material 5 and configure buoyancy to suspend it in a depth range of 5-20 meters below the water surface. Then, arrange multiple segments of zigzag topology in the horizontal plane, while controlling the minimum bending radius of the bending section to be ≥10 times the diameter (D) of the submarine cable. Next, install cable protection sleeves 4 on the bending sections of the dynamic submarine cable 1, and arrange steel fiber reinforced concrete gravity blocks 2 on the seabed. The size of each gravity block 2 is 5m×5m×1m, and the surface is provided with shear key structures. Then, connect the gravity blocks 2 to the bending sections of the dynamic submarine cable 1 through elastic cables 3.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A shallow water dynamic cable suspension structure with a resilient anchoring system, characterized in that, include: A dynamic submarine cable, the outer surface of which is covered with buoyancy material, so that the dynamic submarine cable is suspended at a predetermined depth below the water surface; Gravity blocks, placed on the seabed, are used to provide fixed anchor points; The elastic cable is fixedly connected to the dynamic submarine cable and the gravity block at both ends, so that the dynamic submarine cable forms a non-linear spatial layout in the horizontal plane and works in conjunction with the buoyancy material in the vertical direction to realize the dynamic adaptation of the submarine cable. A cable protection sleeve is fitted onto the curved section of the dynamic submarine cable; The elastic cable and the gravity block work together to limit the positional displacement of the dynamic submarine cable.

2. A shallow water dynamic cable suspension structure with elastic anchoring system according to claim 1, characterized in that, The elastic cable is composed of a UHMWPE fiber core and a neoprene rubber outer layer.

3. A shallow water dynamic cable suspension structure with elastic anchoring system according to claim 1, characterized in that, The gravity block is a steel fiber reinforced concrete structure.

4. A shallow water dynamic cable suspension structure with elastic anchoring system according to claim 1, characterized in that, The cable protection sleeve is made of three-layer co-extruded HDPE material.

5. A shallow water dynamic cable suspension structure with elastic anchoring system according to claim 1, characterized in that, The buoyancy material includes a linear low-density polyethylene or high-density polyethylene rotational molded shell, and EPS foam or polyurethane foam filled inside the shell, with an overall density of 0.4~0.6 g / cm³.

6. The shallow-water dynamic cable suspension structure with an elastic anchoring system according to claim 1, characterized in that, The non-linear spatial layout is a curved topology, including catenaries or segmented smooth curves, wherein the radius of curvature of the curved topology is ≥10 times the diameter of the dynamic submarine cable.

7. A shallow water dynamic cable suspension structure with elastic anchoring system according to claim 1, characterized in that, The surface of the gravity block is provided with a shear key structure.

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