Deepwater anchoring system provided with net bag structure and made of fiber composite material

Abstract

The invention discloses a fiber composite material deepwater anchoring system provided with a net bag structure, which comprises an anchor cable, one end of the anchor cable is connected with a floating body, and the other end of the anchor cable is connected with a pile foundation fixed underwater; the plurality of fixing parts are sleeved on the anchor cable; the fixing components are arranged at intervals in the anchor cable direction. And the additional weight is arranged on the fixing component. The shape and the damping coefficient of the deepwater anchoring system are adjusted by adjusting the distribution density of the net bags on the anchor cable, the density and the weight of the heavy objects borne in the net bags, the particle distribution level and other parameters, and the restoring force and the stability performance of the system in the service process are improved. Due to the characteristics of corrosion resistance, light weight and high strength of the fiber composite material, the novel anchoring system is high in corrosion resistance and excellent in anchoring stability, and the problem that a traditional steel anchoring system is poor in corrosion resistance and the problem that a polyurethane anchoring system is poor in overall anchoring stability due to the fact that the self weight and damping are small are solved.

Description

Technical Field

[0001] The invention relates to the technical field of anchor cables, in particular to a deep-water anchoring system made of fiber composite materials and equipped with a net bag structure. Background Art

[0002] Oil and gas resources play a huge role in national development. The proven reserves of marine oil resources are relatively high. Going to the ocean has become the main trend of oil and gas resource exploitation. From shallow water to deep water, and then to ultra-deep water, human beings have never stopped in this regard. Various marine platforms have sprung up in the ocean. Among them, semi-submersible drilling platforms have excellent performance and are widely used in deep-water drilling. The design of their mooring systems has also become a research hotspot for many scholars. In order to ensure that the semi-submersible platform works normally at sea, that is, it does not drift significantly under the combined effects of wind, waves, currents and other marine environments to affect production operations, the existing mooring systems include catenary, tension and tension leg types, of which the first two are widely used in semi-submersible drilling or wind turbine platforms. The catenary mooring system mainly relies on the weight of the anchor chain and the changes in the suspended section to provide restoring force, but its underwater weight is large and difficult to recover and store; the tensioned mooring system generally uses steel cables or other composite materials, relying on the tensile deformation of the cable to provide restoring force. Its weight is lighter than the catenary type, but its cost is higher, and it is easy to generate impact loads during operation. It has high requirements on the strength of the cable and is prone to fatigue fracture. Its applicability is also lower than the catenary mooring system. Summary of the invention

[0003] The object of the present invention is to provide a deep-water mooring system made of fiber composite materials with a net bag structure to solve the above problems. Compared with the traditional catenary mooring system with anchor chains as the main body, the present invention has the characteristics of easy carrying and installation, the anchor cable material has higher material properties, and the fiber composite material used has the characteristics of high strength, high modulus and high stiffness, which can solve the problems that traditional anchor chains are easily corroded when working in the marine environment and tensioned fiber anchor cables are prone to fatigue fracture when working; and the weight blocks can be recovered one by one and then the main part of the cable can be recovered to reduce the working pressure of the anchor machine; the weight and position of the weight blocks can be adjusted to achieve the purpose of changing the state of the anchor cable.

[0004] To achieve the above object, the present invention provides the following solution: The present invention provides a deep-water mooring system made of fiber composite material with a net bag structure, comprising:

[0005] An anchor cable, one end of which is connected to the floating body, and the other end of which is connected to a pile foundation fixed underwater;

[0006] A plurality of fixing components, wherein the plurality of fixing components are sleeved on the anchor cable; the plurality of fixing components are arranged at intervals along the direction of the anchor cable;

[0007] A plurality of additional weight blocks are respectively arranged in one-to-one correspondence with the plurality of fixing components, and the additional weight blocks are arranged on the fixing components.

[0008] Preferably, the anchor cable is configured as a fiber composite material.

[0009] Preferably, the fixing component comprises two half rings, the two half rings are arranged opposite to each other, and the two half rings form a whole ring which is sleeved on the anchor cable, the two half rings are fixedly connected by a connecting piece, and the whole ring formed by the two half rings is fastened to the anchor cable by the connecting piece.

[0010] Preferably, the connecting member includes a connecting plate, which is respectively arranged on both sides of the two semi-rings, the connecting plate is fixedly connected to the semi-rings, a plurality of connecting holes are opened on the connecting plate, and the two connecting plates abutting against each other are connected by a plurality of bolts, and the bolts are adapted to the connecting holes and are connected by threads.

[0011] Preferably, the additional weight block comprises a net bag filled with a heavy object, the heavy object is iron ore, and the net bag is connected to the fixed component via a fixing piece.

[0012] Preferably, the fixing member comprises a plurality of hooks, the plurality of hooks are fixedly connected to the bottom surface of the semi-ring, and the net bag is adapted to the hooks.

[0013] The present invention discloses the following technical effects: Due to the corrosion resistance and light weight and high strength of fiber composite materials, the present invention provides a new type of anchoring system with strong corrosion resistance and excellent anchoring stability for the marine engineering field, which well solves the shortcomings of poor corrosion resistance of traditional steel anchoring systems and the problem of poor overall anchoring stability caused by small deadweight and damping of polyurethane anchoring systems. Compared with traditional anchor chains, the present invention is not only easy to carry and install, but also has high corrosion resistance of fiber composite materials, suitable for heavy work in marine environments. In addition, as a catenary anchor cable, it is not easy to produce cable strength and fatigue problems due to frequent relaxation and tensioning of jumping impact loads like existing tensioned fiber material anchor cables. The present invention can adjust the shape and damping coefficient of the deep-water mooring system by adjusting the distribution density of the net bags on the anchor cable, the density, weight and particle distribution order of the heavy objects carried in the net bags, thereby improving the restoring force and stability of the system during service. The catenary form of the anchor cable can be optimized to adapt to the working conditions and achieve better working results. This solution can be widely used in deep-water or shallow-water floating wind turbine platforms or oil and gas platforms to meet the mooring and positioning requirements of offshore equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0015] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the fixing component in Example 1 of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of Example 2 of the present invention;

[0018] Among them, 1. Anchor cable; 2. Floating body; 3. Pile foundation; 4. Half ring; 5. Connecting plate; 6. Hook; 7. Auxiliary plate; 8. Limiting cylinder. DETAILED DESCRIPTION

[0019] 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.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1, reference Figure 1-2 The present invention provides a deep-water mooring system made of fiber composite material with a net bag structure, comprising:

[0022] An anchor cable 1, one end of the anchor cable 1 is connected to the floating body 2, and the other end of the anchor cable 1 is connected to a pile foundation 3 fixed underwater;

[0023] A plurality of fixing components, each of which is sleeved on the anchor cable 1 at intervals; and a plurality of fixing components are arranged at intervals along the direction of the anchor cable 1;

[0024] A plurality of additional weight blocks are respectively arranged in one-to-one correspondence with a plurality of fixing components, and the additional weight blocks are arranged on the fixing components.

[0025] The anchor cable 1 of the present invention is made of fiber composite material, has the advantages of high strength, high rigidity, wear resistance and corrosion resistance, and is suitable for working in marine environment. The anchor cable 1 is externally composed of additional weight blocks arranged discontinuously or continuously, and the additional weight blocks arranged externally are fixed to the anchor cable 1 by a net bag, and the net bag can be filled with iron ore and other heavy objects to change the weight. It has the advantages of flexible arrangement and weight setting according to demand. The weight blocks can be added, deleted and adjusted according to different working conditions to meet the needs of different working conditions. This solution can solve the defects of traditional anchor chains that are difficult to carry, difficult to recycle, and not corrosion-resistant.

[0026] Further optimization scheme, the anchor cable 1 is set as a fiber composite material, which can solve the problem that the traditional anchor chain is not corrosion-resistant and the underwater part is too heavy and difficult to recover. And due to the corrosion resistance and light weight and high strength characteristics of fiber composite materials, the present invention provides a new anchoring system with strong corrosion resistance and excellent anchoring stability for the marine engineering field, which well solves the shortcomings of poor corrosion resistance of traditional steel anchoring systems and the problem of poor overall anchoring stability caused by small deadweight and damping of polyurethane anchoring systems. And compared with traditional anchor chains, the present invention is not only easy to carry and install, but also has higher corrosion resistance of fiber composite materials, suitable for heavy work in marine environments. In addition, as a catenary anchor cable, it is not easy to produce cable strength and fatigue problems due to frequent relaxation and tensioning of jumping impact loads like the existing tensioned fiber material anchor cable 1.

[0027] A further optimized solution is that the fixing component includes two half rings 4, the two half rings 4 are arranged opposite to each other, and the two half rings 4 form a whole ring which is sleeved on the anchor cable 1, the two half rings 4 are fixedly connected by a connecting piece, and the whole ring formed by the two half rings 4 is fastened to the anchor cable 1 by the connecting piece.

[0028] The two half rings 4 can be butted and fixed at any position of the anchor cable 1 to ensure that they can respond normally with the anchor cable 1.

[0029] A further optimized solution is that the connecting piece includes a connecting plate 5. A connecting plate 5 is respectively arranged on both sides of the two half rings 4. The connecting plate 5 is fixedly connected to the half rings 4. A plurality of connecting holes are opened on the connecting plate 5. The two connecting plates 5 abutting against each other on the two connecting plates 5 are connected by a plurality of bolts. The bolts are adapted to the connecting holes and are connected by threads.

[0030] According to a further optimization scheme, the additional weight block includes a net bag filled with heavy objects, the heavy objects are iron ore, and the net bag is connected to the fixed component through a fixing piece.

[0031] The net bag is made of fiber material and can store a certain amount of heavy objects to change the weight of the weight block and further adjust the catenary state.

[0032] The present invention can adjust the shape and damping coefficient of the deep-water mooring system by adjusting the distribution density of the net bags on the anchor cable 1, the density, weight and particle distribution order of the heavy objects carried in the net bags, thereby improving the restoring force and stability of the system during service. The catenary form of the anchor cable 1 can be optimized to adapt to the working conditions and achieve better working results. This solution can be widely used in deep-water or shallow-water floating wind turbine platforms or oil and gas platforms to meet the mooring and positioning requirements of offshore equipment.

[0033] According to a further optimized solution, the fixing member includes a plurality of hooks 6 , which are fixed to the bottom surface of the semi-ring 4 , and the net bag is matched with the hooks 6 .

[0034] The fiber composite anchor cable of the present invention has a length comparable to that of a conventional anchor chain. Each additional weight block is composed of two net bags, and the top of each net bag is fixed to a half ring 4 through a hook 6 and fixed to the anchor cable 1 through the half ring 4.

[0035] The present invention can replace the traditional catenary anchor chain in terms of structure, so that the applicability of the catenary system in deep water is enhanced, and it can work normally at water depths where traditional anchor chains cannot work. The anchor cable 1 has high wear resistance and corrosion resistance, and is suitable for long-term work in deep water environments. In terms of functionality, the position of the additional weight block can be arranged by an underwater robot to adjust the catenary form of the mooring system. When the mooring system is recovered, the additional weight block can be removed first and then the cable can be recovered to reduce the working pressure of the anchor winch. In terms of economy, the additional weight block has a simple structure, and the interior can be filled with iron ore, etc., which is inexpensive and easy to manufacture; fiber composite materials are widely used in various fields and have a long working life, which is more economical than traditional anchor cables. In terms of processing and manufacturing, the complex anchor chain manufacturing process is eliminated, and the anchor cable 1 and additional weight blocks made of fiber composite materials that are easy to produce are used instead.

[0036] Example 2, reference Figure 3 The bottom surfaces of the semi-rings 4 are respectively fixed with a number of hooks 6 through auxiliary parts. The auxiliary parts include auxiliary plates 7. The top surface of the auxiliary plates 7 is fixedly connected to the bottom surface of the semi-rings 4. The auxiliary plates 7 are arranged in an arc-shaped structure. The two auxiliary plates 7 on the two semi-rings 4 are butted to form a whole ring. A number of hooks 6 are fixedly connected to the bottom surface of the auxiliary plates 7. A limiting cylinder 8 is sleeved on the outer walls of the two auxiliary plates 7. The inner wall of the limiting cylinder 8 is connected to the outer wall of the auxiliary plate 7 by threads. The provided limiting cylinder 8 can play a role in reinforcing the two semi-rings 4. At the same time, after the hooking of the net bag is completed, the limiting cylinder 8 can be moved downward by rotating the limiting cylinder 8. The hook 6 hooks the net bag and enters the inner cavity of the limiting cylinder 8, which plays a protective effect and prevents it from slipping.

[0037] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A deep-water mooring system made of fiber composite material with a net bag structure, characterized in that: include: An anchor cable (1), one end of the anchor cable (1) is connected to a floating body (2), and the other end of the anchor cable (1) is connected to a pile foundation (3) fixed underwater; A plurality of fixing components, wherein the plurality of fixing components are sleeved on the anchor cable (1); the plurality of fixing components are arranged at intervals along the direction of the anchor cable (1); A plurality of additional weight blocks are respectively arranged in one-to-one correspondence with the plurality of fixing components, and the additional weight blocks are arranged on the fixing components.

2. A deep-water mooring system made of fiber composite material with a net bag structure according to claim 1, characterized in that: The anchor cable (1) is configured as a fiber composite material.

3. A deep-water mooring system made of fiber composite material with a net bag structure according to claim 1, characterized in that: The fixing component comprises two half rings (4), the two half rings (4) are arranged opposite to each other, and the two half rings (4) form a whole ring which is sleeved on the anchor cable (1), the two half rings (4) are fixedly connected by a connecting piece, and the whole ring formed by the two half rings (4) is fastened to the anchor cable (1) by the connecting piece.

4. A deep-water mooring system made of fiber composite material with a net bag structure according to claim 3, characterized in that: The connecting member comprises a connecting plate (5), and the connecting plates (5) are respectively arranged on both sides of the two half rings (4), the connecting plates (5) are fixedly connected to the half rings (4), and a plurality of connecting holes are opened on the connecting plate (5). The two connecting plates (5) abutting against each other on the two connecting plates (5) are connected by a plurality of bolts, and the bolts are adapted to the connecting holes and are connected by threads.

5. A deep-water mooring system made of fiber composite material with a net bag structure according to claim 4, characterized in that: The additional weight block comprises a net bag filled with a heavy object, wherein the heavy object is iron ore, and the net bag is connected to the fixed component via a fixing piece.

6. A deep-water mooring system made of fiber composite material with a net bag structure according to claim 5, characterized in that: The fixing member comprises a plurality of hooks (6), the plurality of hooks (6) being fixedly connected to the bottom surface of the semi-ring (4), and the net bag being adapted to the hooks (6).

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