Dual cable rigid integrated subsea cable bend restrictor and central tube clamp system

Abstract

This invention relates to a dual-cable rigid integrated submarine cable bending limiter and a central tube clamp system. The segmented dual-channel rigid bending limiter and the dual-cable integrated central tube clamp are rigidly connected to form a dual-channel structure accommodating two parallel submarine cables. The segmented dual-channel rigid bending limiter adopts a nestable rigid integrated structure with two independent channels. The dual-cable integrated central tube clamp connects a transition section, a dual-cable progressive coiling ring, a dual-cable conical sleeve, and a backlash ring via the bending limiter, enabling simultaneous fixing of the two-circuit submarine cables within a single J-shaped tube. This system solves the technical problems of low construction efficiency, difficulty in controlling the spacing between the two cables, and poor reliability of temporary binding inherent in traditional split-type installation methods. It simplifies the tower climbing construction of dual-circuit submarine cables into a single operation, increasing construction efficiency by more than 40%, while effectively avoiding the risks of cable collision and loosening, significantly improving the construction safety and reliability of deep-sea flexible DC transmission projects.

Description

Technical Field

[0001] This invention belongs to the technical field of submarine cable laying equipment, specifically relating to a dual-cable rigid integrated submarine cable bending limiter and central tube clamp system, particularly for the construction needs of positive and negative dual-cable synchronous access to the booster station in ±200kV and above flexible DC transmission projects. Background Technology

[0002] In deep-sea flexible DC transmission projects, the construction of dual-cable parallel submarine submersibles faces significant technical challenges at substations. Traditional split-installation methods require separate handling of the two cables, leading to the following prominent issues during construction:

[0003] 1. Existing single-cable bending limiters can only be installed in series independently. In the case of parallel operation of two submarine cables, they need to be installed sequentially, which cannot adapt to the parallel operation of two cables, resulting in low efficiency of repetitive work.

[0004] 2. If two independently installed cables are close together, in addition to the inconvenience of construction, the relative positions of the two submarine cables may change under the influence of tidal currents and scouring effects, causing safety hazards.

[0005] 3. Temporary binding construction measures are difficult to solve reliability problems and are prone to loosening when two cables pass through facilities such as J-shaped pipes at the same time.

[0006] The solutions currently used in the industry have obvious flaws:

[0007] 1. Split-type installation requires two J-shaped pipe threading operations, increasing construction time by more than 40%;

[0008] 2. The binding device cannot accurately control the spacing between the two cables, causing the cables to collide at the entrance of the J-tube;

[0009] 3. Traditional center tube clamps are only suitable for single-cable structures, requiring two tube insertions or the use of two independent J-type tubes to accommodate submarine cables. Temporary binding cannot achieve balanced stress distribution in dual-cable systems.

[0010] In existing related technologies, such as patent document (CN206947912U), a flexible protection device for a single submarine cable is disclosed. Its bending limiter is a single-channel design, which can only meet the protection needs of a single submarine cable and cannot adapt to the parallel operation of two cables. Moreover, the flexible structure cannot guarantee the synchronous bending accuracy of the two cables. Although the bending limiter in patent document (CN212137236U) can be spliced, it is still a single-channel structure, which does not solve the problem of controlling the spacing and synchronous movement of the two cables. In addition, it relies on the flexible connection of the half-tube splicing, which has insufficient rigidity and results in poor protection stability.

[0011] Therefore, there is an urgent need to develop an integrated dual-cable bending limiting system, which should have the following characteristics:

[0012] 1. A rigid integrated structure is adopted to ensure synchronous movement of the two cables during bending;

[0013] 2. Built-in dual-channel design enables high-precision spacing control;

[0014] 3. The terminal integration can accommodate a central tube clamp for two-circuit submarine cables, completing the transition from split-line to parallel operation. Summary of the Invention

[0015] This invention proposes a dual-cable rigid integrated submarine cable bending limiter and center tube clamp system. The system employs a segmented dual-channel rigid bending limiter to constrain and protect the bending radius of two parallel-laid tower-climbing submarine cables. Simultaneously, a dual-cable integrated center tube clamp integrates the two-loop submarine cables into a single clamp. This system allows both submarine cables to pass through the same tower-climbing J-tube simultaneously, simplifying the tower-climbing construction of dual-loop submarine cables, which originally required two separate operations, into a single operation. This significantly shortens the construction cycle and effectively reduces the construction difficulty of parallel laying of dual-loop submarine cables.

[0016] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0017] A dual-cable rigid integrated submarine cable bending limiter and center tube clamp system includes a segmented dual-channel rigid bending limiter and a dual-cable integrated center tube clamp. The segmented dual-channel rigid bending limiter and the dual-cable integrated center tube clamp are rigidly connected to form a dual-channel structure that can accommodate two parallel submarine cables.

[0018] Furthermore, the segmented dual-channel rigid bending limiter adopts a rigid integrated structure that can be nested in pairs. It is connected by fixing bolts and has two independent channels built in, ensuring that the two cables move synchronously during bending and avoiding relative displacement.

[0019] Furthermore, the dual-cable integrated center tube clamp includes a bending limiter connecting transition section, a dual-cable progressive gathering ring, a dual-cable conical sleeve, and a backlash ring. The bending limiter connecting transition section is connected to the dual-cable conical sleeve through the dual-cable progressive gathering ring and the backlash ring.

[0020] Furthermore, the dual-cable integrated central tube clamp can accommodate two-circuit submarine cables, enabling a split-parallel transition.

[0021] Furthermore, the bending limiter connecting transition section is a symmetrical two-piece structure, which is fixed by fixing bolts.

[0022] Furthermore, the dual-cable progressive snagging ring has a hollow conical structure that can accommodate two submarine cables and is used for connecting the bend limiter transition section and the dual-cable conical sleeve.

[0023] Furthermore, the dual-cable progressive coiling ring gradually reduces the distance between the two cables, ensuring that the cables are joined together at the end of the central tube clamp.

[0024] Furthermore, the double-cable conical sleeve adopts a left and right two-piece combination structure, connected by fixing bolts, hollow inside, and is equipped with a cable shaping bracket inside the conical sleeve for fixing and shaping the position and spacing of the cable, and finally making the two separate submarine cables completely close at the outlet position of the double-cable conical sleeve.

[0025] Furthermore, the anti-reverse ring adopts an upper and lower two-set structure, which is fixed in the mounting groove of the double-cable conical sleeve by fixing bolts, and is used to fix the double-cable integrated central tube clamp as a whole in the J-shaped tube.

[0026] Furthermore, the double-cable conical sleeve is the core component of the central tube clamp, which, in conjunction with the anti-reverse ring installed on the double-cable conical sleeve, fixes the two submarine cables passing through the tube in a fixed position inside the J-shaped tube.

[0027] The beneficial effects of this invention include:

[0028] 1. By adopting a rigid integrated structure and segmented design, the bending of the two cables is synchronized, eliminating the repetitive work of traditional split installation and improving construction efficiency by more than 40%.

[0029] 2. Built-in dual-channel and progressive convergence ring precisely control the spacing between the two cables, avoiding the risk of collision at the J-tube inlet and turbulence.

[0030] 3. The terminal integrated central tube clamp, combined with the conical sleeve shaping bracket, enables two submarine cables to be fixed simultaneously in a single J-shaped tube, solving the problem of loosening of temporary bindings and significantly improving system reliability.

[0031] 4. The integrated design simplifies the process of climbing the double cable tower, requiring only a single J-shaped pipe threading operation, which greatly reduces the construction difficulty and cycle, and is suitable for ±200kV and above flexible DC transmission projects. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the assembly of a dual-cable rigid integrated submarine cable bending limiter and central tube clamp system.

[0033] Figure 2 This is a schematic diagram of the segmented dual-channel rigid bending limiter of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the dual-cable integrated central tube clamp of the present invention;

[0035] Figure 4 An exploded view of the structure of the dual-cable integrated central tube clamp of the present invention;

[0036] Figure 5 This is a schematic diagram of the bending limiter connection transition section structure in the dual-cable integrated central tube clamp of the present invention;

[0037] Figure 6 This is a schematic diagram of the dual-cable progressive convergence ring structure in the dual-cable integrated central tube clamp of the present invention.

[0038] Figure 7 This is a schematic diagram of the double-cable conical sleeve structure in the double-cable integrated central tube clamp of the present invention;

[0039] Figure 8 This is a schematic diagram of the anti-reverse ring structure in the dual-cable integrated central tube clamp of the present invention;

[0040] Figure 9 This is a schematic diagram of the installation of each component of the dual-cable rigid integrated submarine cable bending limiter and central tube clamp system.

[0041] Figures 10-11 This is a schematic diagram of the working process of a dual-cable rigid integrated submarine cable bending limiter and central tube clamp system. Detailed Implementation

[0042] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0043] like Figure 1 As shown, the dual-cable rigid integrated submarine cable bending limiter and central tube clamp system of the present invention consists of two key components: a segmented dual-channel rigid bending limiter 100 and a dual-cable integrated central tube clamp 200.

[0044] like Figure 2 As shown, the segmented dual-channel rigid bending limiter 100 adopts a rigid integrated structure that can be nested in pairs and is connected by fixing bolts 300. It has two independent channels built in to ensure that the two cables move synchronously during bending and avoid relative displacement.

[0045] like Figure 3 , 4 As shown, the dual-cable integrated center tube clamp 200 consists of a bending limiter connecting transition section 210, a dual-cable progressive gathering ring 220, a dual-cable conical sleeve 230, and a backstop ring 240.

[0046] like Figure 5 As shown, the bending limiter connecting transition section 210 adopts a two-piece symmetrical structure with a space for accommodating the submarine cable 400. It is fixed by fixing bolts 300 and serves as a connecting node to connect the segmented dual-channel rigid bending limiter 100 and the clamp body to ensure the overall rigidity and integrity of the system.

[0047] like Figure 6As shown, the dual-cable progressive coiling ring 220 has a hollow cavity that can accommodate two submarine cables 400 and serves to connect the bend limiter connecting transition section 210 and the dual-cable tapered sleeve 230. At the same time, the dual-cable progressive coiling ring 220 gradually coils the distance between the two cables to ensure that the cables are brought together at the end of the dual-cable integrated central tube clamp 200.

[0048] like Figure 7 As shown, the double-cable conical sleeve 230 adopts a left and right two-piece combination structure, which is connected by fixing bolts 300. It is hollow inside and is equipped with a cable shaping bracket 231 inside the conical sleeve, which is used to fix and shape the position and spacing of the cable, and finally make the two separate submarine cables 400 completely close at the outlet position of the double-cable conical sleeve 230.

[0049] like Figure 8 As shown, the anti-reverse ring 240 adopts an upper and lower two-set design, and is fixed in the mounting groove of the double-cable tapered sleeve 230 by fixing bolts 300, which serves to fix the double-cable integrated center tube clamp 200 as a whole in the J-shaped tube 500.

[0050] like Figure 9 , 10 As shown in Figure 11, under normal circumstances, two parallel submarine cables 400 require the installation of two separate sets of bending limiters and center tube clamps to pass through two separately installed J-shaped pipes 500 to reach the top of the platform. The construction steps are cumbersome. However, when using the dual-cable rigid integrated submarine cable bending limiter and center tube clamp system 001, the entire dual-cable rigid integrated submarine cable bending limiter and center tube clamp system 001 can accommodate two submarine cables 400 at once, so that the work of passing through the J-shaped pipes 500 can be completed in one go, which greatly reduces the construction difficulty and cycle.

Claims

1. A dual cable rigid integrated subsea cable bend restrictor and central tube clamp system, characterized by, The system includes a segmented dual-channel rigid bend limiter and a dual-cable integrated center tube clamp. The segmented dual-channel rigid bend limiter and the dual-cable integrated center tube clamp are rigidly connected to form a dual-channel structure that accommodates two parallel submarine cables. The segmented dual-channel rigid bend limiter adopts a rigid integrated structure that can be nested in pairs and is connected by fixing bolts. It has two independent channels built in to ensure that the two cables move synchronously during bending and avoid relative displacement. The dual-cable integrated center tube clamp includes a bend limiter connecting transition section, a dual-cable progressive convergence ring, a dual-cable conical sleeve, and a backlash prevention ring. The transition section is connected to the double-cable conical sleeve via a double-cable progressive condenser ring and a backlash ring. The double-cable progressive condenser ring is a hollow conical structure that can accommodate two submarine cables and is used to connect the transition section and the double-cable conical sleeve via a bend limiter. The double-cable progressive condenser ring gradually condenses the distance between the two cables to ensure that the cables come together at the end of the central tube clamp. The double-cable conical sleeve adopts a left and right combined structure, connected by fixing bolts. It is hollow inside and is equipped with a cable shaping bracket inside the conical sleeve to fix and shape the position and spacing of the cables, and finally make the two separate submarine cables completely close at the exit position of the double-cable conical sleeve.

2. The dual-cable rigid integrated submarine cable bending limiter and central tube clamp system according to claim 1, characterized in that, The dual-cable integrated central tube clamp can accommodate two-circuit submarine cables, enabling a split-parallel transition.

3. The dual-cable rigid integrated submarine cable bending limiter and central tube clamp system according to claim 1, characterized in that, The bending limiter connecting transition section is a symmetrical two-piece structure, which is fixed by fixing bolts.

4. The dual-cable rigid integrated submarine cable bending limiter and central tube clamp system according to claim 3, characterized in that, The anti-reverse ring adopts an upper and lower two-set structure, which is fixed in the mounting groove of the double-cable conical sleeve by fixing bolts, and is used to fix the double-cable integrated center tube clamp as a whole in the J-shaped tube.

5. The dual-cable rigid integrated submarine cable bending limiter and central tube clamp system according to claim 1, characterized in that, The double-cable tapered sleeve is the core component of the central tube clamp. It works in conjunction with the anti-reverse ring installed on the double-cable tapered sleeve to fix the two submarine cables passing through the tube in a fixed position inside the J-shaped tube.

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