Submarine cable bending protection system and device

Abstract

The invention discloses a submarine cable bending protection system and device. The system comprises a central positioning protection device and a bending protection device which are sequentially arranged, the central positioning protection device comprises a protection body, the front end of the protection body is conical, the protection body is assembled on a submarine cable, and the protection body is used for assembling the submarine cable in a tail section of a bent pipe. A positioning protection assembly A and a positioning protection assembly B are sequentially installed on the outer wall of the protection body, and the positioning protection assembly A and the positioning protection assembly B are both in abutting fit with the inner wall of the bent pipe so that the submarine cable can be maintained at the center position of the tail section of the bent pipe.According to the submarine cable bending protection system provided by the invention, the central position of the submarine cable can be positioned, and the positioning is accurate, so the submarine cable can be effectively prevented from sliding off from the bent pipe; and according to the bending protection device, bending protection on the submarine cable can be achieved, meanwhile, bending degree adjustment can be achieved, double-effect protection is achieved, the submarine cable is small in swing amplitude and high in impact resistance, and the current use requirement is met.

Description

technical field [0001] The invention relates to the field of submarine cable protection, in particular to a submarine cable bending protection system and a protection device. Background technique [0002] Submarine cables are electrical cables wrapped in insulating material and laid on the ocean floor for telecommunications transmission. Submarine cables are divided into submarine communication cables and submarine power cables. [0003] With the increasing demand for energy in my country, the development of offshore oil and gas and offshore wind power is also rapidly increasing. With the large-scale construction of offshore wind farms, submarine cables are the transmission medium of electric energy, and their safety and reliability are of paramount importance. In offshore wind farms, the submarine cable is generally connected to the wind turbine base platform through a curved pipe fixed on the wind turbine pile foundation. In order to facilitate the construction of the su...

AI Technical Summary

Problems solved by technology

In offshore wind farms, the submarine cable is generally connected to the wind turbine base platform through a curved pipe fixed on the wind turbine pile foundation. In order to facilitate the construction of the submarine cable through the curved pipe, the inner diameter of the curved pipe is generally 2-2.5 times the outer diameter of the submarine cable. , and the transition section of the submarine cable from the tail of the curved pipe to the contact with the seabed is in an arc-shaped suspended state, especially in offshore wind farms, due to the strong ocean currents, swells, and waves, scour and subsidence areas are easily formed around the foundation piles, and in ocean currents Under the action of scour, the subsidence area becomes larger and larger, which leads to the longer and longer suspension section of the submarine cable, which is prone to excessive bending of the submarine cable. Once the bending radius of the submarine cable is smaller than its safe working radius, the performance will be affected. At the same time, the long-term Under the action of ocean currents, it will continue to swing repeatedly, prone to fatigue damage. Since the inner diameter of the curved pipe is much larger than the outer diameter of the submarine cable, the submarine cable and the curved pipe will continue to rub against each other, which will also cause the outer protective layer of the submarine cable to wear and eventually destroy the submarine cable. Performance

[0004] In view of the above problems, currently the commonly used method is to use riprap or throwing concrete bags to fill the scoured subsidence area of ​​the foundation pile attachment, but these methods are difficult to construct, and under the long-term scouring of ocean currents, the stone Or the concrete bag will also be washed away, so it needs to be refilled and reinforced after a period of time, so the overall cost is higher

Another method is to add a section of nodular cast iron protective tube after the curved tube for reinforcement. This method has a certain protective effect on the bending of the submarine cable, but it does not take into account the limit of the submarine cable in the curved tube, and the submarine cable can still Any swing in the curved pipe will rub against the curved pipe. At the same time, the material of the ductile cast iron protective pipe is cast iron, which is very easy to corrode in seawater. Once corrosion damage occurs, it will not be able to protect the cable. Loaded, it is more likely to cause the suspension section to bend

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