Submarine cable limiting protection and monitoring system for suspended section of offshore jacket foundation side

Abstract

The invention discloses an offshore jacket foundation side suspended section submarine cable limiting protection and monitoring system which comprises at least one set of steel wire cables, every two adjacent sets of steel wire cables are arranged in the middle of a submarine cable at intervals, each set of steel wire cables comprises two steel wire cables which are arranged on the two sides of the submarine cable respectively, and the upper ends of the steel wire cables are connected with the same point position of the submarine cable. The steel wire cable is provided with a steel plate stress meter, a vibration displacement meter is arranged at the joint of the steel wire cable and the submarine cable, and a reference electrode is arranged at the joint of the steel wire cable and the pile body of the jacket foundation; the steel plate stress meter, the vibration displacement meter and the reference electrode are connected with a monitoring data automatic acquisition instrument through a corrosion-resistant cable, and the monitoring data automatic acquisition instrument is arranged on a platform. According to the method, the risk that the submarine cable of the suspended section on the foundation side of the offshore jacket swings violently and is bent or worn can be effectively reduced, and meanwhile, real-time and accurate data support is provided for evaluating the health state of the submarine cable.

Description

Technical Field

[0001] The invention belongs to the technical field of marine engineering, and in particular relates to a position limiting protection and monitoring system for a suspended section of a submarine cable on a foundation side of an offshore conductor frame. Background Art

[0002] In recent years, the design concept of J-tubes for submarine cables and the construction technology of submarine cable laying in my country's offshore wind power projects have led to a certain length of suspended sections on the foundation side of offshore booster stations. The length of some suspended sections of submarine cables has even reached 30m. Coupled with the increasingly severe foundation scouring problem, the suspended length and height of the suspended section of submarine cables on the foundation side of offshore booster stations have been continuously increasing, which also poses a serious threat to the structural safety of the cable body itself. Compared with static submarine cables laid on the seabed, the operating conditions of suspended sections of submarine cables have the characteristics of more load types, greater randomness, and more complex and severe load conditions. The direct effect of marine environmental loads will cause the suspended section of submarine cables to produce dynamic responses, generate large tension and bending moment loads, and the local suspension caused by changes in the seabed topography may also cause vortex-induced vibration (VIV), which is very harmful to submarine cables.

[0003] The main reason for the failure of the suspended section of the submarine cable on the foundation side of the offshore booster station is the local bending of the submarine cable or the wear and tear of the contact with the seabed. Due to the scouring problem, the suspended height and length of the suspended section of the submarine cable continue to increase, which in turn aggravates the swing amplitude and frequency of the suspended section of the submarine cable in the surge, further increasing the risk of submarine cable failure. Therefore, it is urgent to study a limit protection and monitoring system for the suspended section of the submarine cable on the foundation side of the offshore conductor frame, which can not only effectively solve the problem of the violent swing of the suspended section of the submarine cable with the wave tide, but also monitor the stress, swing and corrosion potential of the suspended section of the submarine cable in real time, and provide accurate data support for evaluating the health status of the suspended section of the submarine cable on the foundation side of the offshore conductor frame. Summary of the invention

[0004] In order to solve the technical problems existing in the known technology, the present invention provides a limit protection and monitoring system for the suspended section of the submarine cable on the foundation side of the offshore conductor frame, which can not only reduce the swing amplitude of the suspended section of the submarine cable with the wave tide, but also can monitor the stress condition, swing condition and corrosion potential of the suspended section of the submarine cable in real time.

[0005] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a submarine cable limit protection and monitoring system for the suspended section on the side of an offshore conductor frame foundation, comprising at least one group of steel cables, two adjacent groups of steel cables are arranged at intervals in the middle of the submarine cable, each group of steel cables includes two cables, which are arranged on both sides of the submarine cable, the upper ends are connected to the same point of the submarine cable, and the lower ends are respectively connected to two piles of the conductor frame foundation. A steel plate stress gauge is installed on the steel cable, a vibration displacement meter is installed at the connection between the steel cable and the submarine cable, and a reference electrode is installed at the connection between the steel cable and the pile body of the conductor frame foundation. The steel plate stress gauge and the vibration displacement meter are both provided with sealed waterproof protective covers on the outside, and the steel plate stress gauge, the vibration displacement meter and the reference electrode are connected to an automatic monitoring data collector using corrosion-resistant cables, and the automatic monitoring data collector is arranged on a platform.

[0006] The steel cable is connected to the pile body of the submarine cable and the pipe frame foundation by using a U-shaped buckle fastener.

[0007] The steel cables are provided in two groups.

[0008] The material of the steel cable is 316L.

[0009] The material of the sealed waterproof protective cover is 316L.

[0010] The advantages and positive effects of the present invention are:

[0011] 1) The principle of laying the steel cable in the present invention is that the triangle has the most stable structural form, so that there are two relatively stable stress points in the middle of the suspended section of the cable, which can effectively reduce the risk of bending or wear of the suspended section of the submarine cable due to the violent swaying of waves and tides.

[0012] 2) The use of flexible limit protection measures can not only effectively reduce the swing amplitude and frequency of the suspended section of the submarine cable, but also ensure that the device will not be broken or damaged under extremely severe sea conditions, thereby extending its service life.

[0013] 3) The materials and monitoring equipment used in the present invention are easy to purchase, cheap to manufacture, and simple and convenient to install on site, so that the subsequent maintenance cost is low.

[0014] 4) The present invention can monitor the stress, swing and corrosion conditions of the suspended section of the submarine cable in real time, so as to timely discover problems and take corresponding measures. It also provides accurate data support for evaluating the health status of the suspended section of the submarine cable on the foundation side of the offshore conductor frame.

[0015] In summary, the present invention can not only effectively reduce the risk of bending or abrasion of the suspended section of the submarine cable on the foundation side of the offshore conductor frame due to severe swinging, but also provide real-time and accurate data support for evaluating the health status of the submarine cable. In addition, the present invention has a clear principle, a simple structure, a low cost, is easy to install on site, and has a low subsequent maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a side view of the present invention;

[0017] Figure 2 It is a top view of the present invention.

[0018] In the figure: 1. Submarine cable; 2. Seabed mud surface; 3. Mud entry point; 4. Steel wire cable; 5. Pile body; 6. Conduit; 7. Steel plate stress gauge; 8. Sealed waterproof protective cover; 9. Vibration displacement meter; 10. Reference electrode; 11. Automatic monitoring data acquisition instrument; 12. Submarine cable J-tube. DETAILED DESCRIPTION

[0019] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0020] See also Figure 1 and Figure 2 A submarine cable position limiting protection and monitoring system for the suspended section on the side of an offshore conductor frame foundation, comprising at least one group of steel cables 4, two adjacent groups of steel cables 4 being spaced apart in the middle of the submarine cable, each group of steel cables 4 comprising two cables, which are respectively arranged on both sides of a submarine cable 1, the upper ends of which are connected to the same point of the submarine cable 1, and the lower ends of which are respectively connected to two piles 5 of the conductor frame foundation, a steel plate stress gauge 7 is installed on the steel cable 4, a vibration displacement meter 9 is installed at the connection between the steel cable 4 and the submarine cable 1, and a reference electrode 10 is installed at the connection between the steel cable 4 and the pile 5 of the conductor frame foundation, a sealed waterproof protective cover 8 is provided on the outer sides of the steel plate stress gauge 7 and the vibration displacement meter 9, the steel plate stress gauge 7, the vibration displacement meter 9 and the reference electrode 10 are connected to an automatic monitoring data collector 11 by a corrosion-resistant cable, and the automatic monitoring data collector 11 is arranged on a platform.

[0021] The more preferred solution of this embodiment is as follows:

[0022] The steel cable 4 is connected to the submarine cable 1 and the pile body 5 of the conductor frame foundation by using U-shaped buckle fasteners, which is simple to construct.

[0023] The steel cables 4 are provided in two groups, which is more economical.

[0024] The steel cable 4 is made of 316L material, which has better corrosion resistance and toughness.

[0025] The material of the sealed waterproof protective cover 8 is 316L, which has better corrosion resistance and toughness.

[0026] Working principle of the present invention:

[0027] The submarine cable J-tube 12 is fixed on the conduit 6 of the conduit frame foundation. The upper end of the suspended section of the submarine cable 1 enters the submarine cable J-tube 12, and the lower end is buried below the seabed mud surface 2 through the mud entry point 3. The two middle positions are fixed by the steel wire cable 4, forming a relatively stable flexible force-bearing structure, so that the submarine cable 1 under the action of waves and tides will not bend or wear and tear due to violent swinging; at the same time, the steel plate stress gauge 7, the vibration displacement meter 9 and the reference electrode 10 can effectively monitor the stress, swing and corrosion conditions of the submarine cable 1, and thus can accurately and timely evaluate the health status of the submarine cable 1.

[0028] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A submarine cable position limiting protection and monitoring system for the suspended section of an offshore jacket foundation side, characterized in that: It comprises at least one group of steel cables, two adjacent groups of steel cables are spaced apart in the middle of the submarine cable, each group of steel cables comprises two cables, which are respectively arranged on both sides of the submarine cable, the upper ends are connected to the same point of the submarine cable, and the lower ends are respectively connected to two piles of the jacket foundation, a steel plate stress gauge is installed on the steel cable, a vibration displacement gauge is installed at the connection between the steel cable and the submarine cable, a reference electrode is installed at the connection between the steel cable and the pile of the jacket foundation, a sealed waterproof protective cover is provided on the outer side of the steel plate stress gauge and the vibration displacement gauge, the steel plate stress gauge, the vibration displacement gauge and the reference electrode are connected to an automatic monitoring data collector by a corrosion-resistant cable, and the automatic monitoring data collector is arranged on a platform.

2. The offshore jacket foundation side suspended section submarine cable position limiting protection and monitoring system according to claim 1 is characterized in that: The steel cable is connected to the pile body of the submarine cable and the pipe frame foundation by using a U-shaped buckle fastener.

3. The offshore jacket foundation side suspended section submarine cable position limiting protection and monitoring system according to claim 1 is characterized in that: The steel cables are provided in two groups.

4. The offshore jacket foundation side suspended section submarine cable position limiting protection and monitoring system according to claim 1, characterized in that: The material of the steel cable is 316L.

5. The offshore jacket foundation side suspended section submarine cable position limiting protection and monitoring system according to claim 1 is characterized in that: The material of the sealed waterproof protective cover is 316L.

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