A submarine cable bending protection system

Abstract

The invention discloses a submarine cable bending protection system, which comprises a center positioning protection device and a protection device arranged in sequence. The center positioning protection device includes a protection body whose front end is tapered. When the submarine cable is assembled in the tail section of the curved tube, the outer wall of the protection body is sequentially equipped with A positioning protection component and B positioning protection component. Maintained at the center position of the tail section of the curved tube, the submarine cable bending protection system proposed by the present invention can realize the positioning of the center position of the submarine cable, the positioning is accurate, and can effectively prevent the submarine cable from slipping from the curved pipe. The bending protection device proposed by the present invention can The bending protection of the submarine cable can be realized, and at the same time, the adjustment of the degree of bending can be realized, and the double-effect protection can be realized, so that the swing range of the submarine cable is small, and the impact resistance is strong, which meets the current use requirements.

Description

technical field [0001] The invention relates to the field of submarine cable protection, in particular to a submarine cable bending protection system. Background technique [0002] Submarine cables are cables wrapped with insulating materials and laid on the seabed for telecommunication transmission. Submarine cables are divided into submarine communication cables and submarine power cables. [0003] With the increasing demand for energy in our 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, the safety and reliability of submarine cables are very important as the transmission medium of electric energy. In a wind farm, 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 ...

AI Technical Summary

Problems solved by technology

[0003] With the increasing demand for energy in our 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, the safety and reliability of submarine cables are very important as the transmission medium of electric energy. In a wind farm, 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 severe ocean currents, swells, and waves, scour and subsidence areas are easily formed around the foundation piles. The lower subsidence area is getting bigger and bigger, 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. Under the action, it will continue to swing repeatedly, which is 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 damage the performance of the submarine cable.

[0004] In view of the above problems, the commonly used method at present is to use riprap or throwing concrete bags to fill the scoured subsidence area near the foundation pile, 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 re-embedded and reinforced after a period of time, so the overall cost is higher. Another method is to add a section of ductile iron protection pipe for reinforcement after the bent pipe. The bending of the cable has a certain protective effect, but the limit of the submarine cable in the curved pipe is not considered. The cable can still swing freely in the curved pipe and will rub against the curved pipe. At the same time, the material of the ductile cast iron protection pipe is cast iron. It is very easy to corrode. Once corrosion damage occurs, it will not be able to protect it. On the contrary, due to its heavy weight, it will increase the load of the submarine cable, and it is more likely to cause the suspension section to bend

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