Friction counterweight accessory for dynamic submarine cable

Abstract

The utility model discloses a friction counterweight accessory for a dynamic submarine cable, belongs to the field of cable equipment, and solves the problem that cable axial tension at a dynamic cable TDP cannot be counteracted when there is no enough linear laying length and related submarine friction in the prior art. In the application, the counterweight support main body arranged along the axial direction of the dynamic cable is used, and the middle part of the counterweight support main body is provided with a through hole for the dynamic cable to pass through; the balance weight support body comprises two half type fixed supports which are oppositely arranged and fixed in a butt joint mode. A plurality of straightening plates are arranged in the through hole of the counterweight support main body, and all the straightening plates are annularly arranged around the axis of the through hole in the counterweight support main body; an adjusting part is arranged between the straightening plate and the balance weight support body, and the straightening plate moves in the through hole of the balance weight support body through the adjusting part. According to the friction counterweight accessory for the dynamic submarine cable, a friction counterweight structure is adopted as a suppression structure, and required force is provided to counteract the axial tension of the cable at the TDP, so that the deviation of the TDP is avoided.

Description

Technical Field

[0001] The utility model relates to a friction counterweight accessory for a dynamic submarine cable, belonging to the field of cable equipment. Background Art

[0002] Submarine cable technology is recognized worldwide as a complex and challenging large-scale engineering undertaking. The design, manufacturing, and construction of these cables are far more complex than those of other cable products. With my country's economic development and the advancement of its new energy policies, the submarine cable market has experienced rapid growth. my country's vast maritime territory and long coastline necessitate the use of submarine cables to connect coastal islands to the mainland's main power grid, as well as to interconnect islands. The exploitation of offshore oil and natural gas fields on my country's continental shelf, as well as the already underway development of offshore wind farms, also require a considerable number of various submarine cables.

[0003] Dynamic submarine cables are subject to the influence of waves and ocean currents, which can cause significant displacement, bending, and torsion. Therefore, they need to run in the water according to a certain linear shape. Therefore, counterweights are usually required to assist in preventing the underwater cable from floating up or deviating from the specified position. During the simulation analysis, if the TDP (minimum touchdown point) deviation of the dynamic cable exceeds the specified design limit, additional measures may be required to reduce potential risks. Friction weights can be used to dissipate the tensile loads applied by the dynamic catenary on the static seabed section to avoid significant touchdown point deviation.

[0004] Figure 1 The effect of line axial force without counteracting static seabed friction is illustrated. Figure 1 Panel (a) shows that there is a net force on the dynamic portion of the line when the platform is in a far-offset position and there is no counteracting seabed friction. Figure 1 (b) shows that, without sufficient straight lay length and static friction, the TDP shifts by a certain amount as the static portion of the line drags along the seabed in the direction of the ship's displacement. This migration may affect the intended dynamic configuration design and pose a risk of conflict.

[0005] Therefore, in the absence of sufficient straight lay length and associated seabed friction, it may be necessary to apply a restraining structure to provide the required force to counteract the cable axial tension at the TDP, thereby avoiding the deflection of the TDP. Utility Model Content

[0006] The utility model provides a friction weight accessory for a dynamic submarine cable, which adopts a friction weight structure as a suppression structure to provide the required force to offset the axial tension of the cable at the TDP, thereby avoiding the deviation of the TDP.

[0007] The technical solution adopted by the utility model is a friction counterweight accessory for a dynamic submarine cable, comprising a counterweight support body arranged along the axial direction of the dynamic cable, and a through hole in the middle of the counterweight support body for the dynamic cable to pass through;

[0008] The main body of the counterweight support includes two Havel-type fixed supports, which are arranged opposite to each other and fixed in a butt joint;

[0009] A plurality of straightening plates are provided in the through hole of the counterweight support body, and all the straightening plates are arranged in a ring shape around the axis of the through hole in the counterweight support body;

[0010] An adjustment portion is provided between the straightening plate and the counterweight support body, and the straightening plate moves in the through hole of the counterweight support body through the adjustment portion.

[0011] Optimized, the friction weight attachment for the above-mentioned dynamic submarine cable and the Havre type fixed support are of solid metal structure;

[0012] The outer surface of the counterweight support body is in the shape of a cuboid, and the openings at both ends of the through hole of the counterweight support body are respectively located on two parallel surfaces of the cuboid of the counterweight support body.

[0013] Optimized, the above-mentioned friction counterweight accessory for dynamic submarine cables, the straightening plate is an arc-shaped plate, the arc-shaped opening of the straightening plate faces the axis of the through hole in the counterweight support body and is coaxially arranged with the through hole;

[0014] The length extension direction of the straightening plate is arranged parallel to the axial direction of the through hole in the counterweight support body.

[0015] Optimized, the friction counterweight accessory for the dynamic submarine cable, the adjustment portion includes a screw rod, the counterweight support body is constructed with a threaded hole for the screw rod to pass through, the screw rod passes through the threaded hole and is threadedly connected to the threaded hole;

[0016] The screw rod passes through the rear end of the threaded hole and is connected to the straightening plate.

[0017] Optimized, the friction weight accessory for the dynamic submarine cable has a screw rod fixing seat on the surface of the straightening plate facing the screw rod, an inverted T-shaped slot is constructed in the screw rod fixing seat, and the end of the screw rod has a connecting piece, which is inserted into the inverted T-shaped slot of the straightening plate;

[0018] The screw rod passes through the counterweight support body and one end exposed outside the counterweight support body is threadedly connected with a nut.

[0019] Optimized, the above-mentioned dynamic submarine cable uses a friction counterweight accessory, and the two Haverford type fixed supports are pivotally connected by a connecting pin; the side of the Haverford type fixed support is provided with an ear plate, and the ear plates of the two Haverford type fixed supports are matched and connected by a connecting bolt.

[0020] Optimally, the friction counterweight accessory for the dynamic submarine cable is provided with a groove on the inner wall of the through hole of the counterweight support body that cooperates with the screw fixing seat.

[0021] Optimized, the above-mentioned friction counterweight accessory for dynamic submarine cables has four straightening plates in the through hole of the counterweight support body, and the screw rods connected to the four straightening plates respectively pass through the four parallel edges of the rectangular parallelepiped of the counterweight support body.

[0022] The advantages of this application are:

[0023] The technical solution of this application utilizes two half-jointed Harvu-style fixed supports to form a rectangular counterweight support body. To eliminate the unavoidable TDP (minimum touchdown point) position shift caused by insufficient weight when the dynamic cable is under axial retraction, the use of a large counterweight support body with a portion of the structure submerged in the seabed sediment effectively increases the overall static end weight, effectively preventing minimum touchdown point shift and expansion of dynamic cable tension, thereby increasing the service life of the entire dynamic cable system.

[0024] The entire structure consists of four straightening plates, forming a circular ring with a gap. When the static end of the dynamic cable passes through the counterweight support body, the straightening plates are pressed against the cable by a control screw, using the tightening force to achieve the required cable fixation. In addition, the use of longer straightening plates can effectively prevent the static end of the dynamic cable from bending and deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The graph is a graph showing the influence of the axial force on the line without offsetting the static seabed friction.

[0026] Figure 2 This is a schematic diagram of the application of dynamic cables;

[0027] Figure 3 This is a schematic diagram of the structure of this application;

[0028] Figure 4 for Figure 3 AA cross-sectional view. DETAILED DESCRIPTION

[0029] The technical features of the present invention are further described below with reference to the accompanying drawings and specific embodiments.

[0030] As shown in the figure, the utility model is a friction weight accessory for dynamic submarine cables, and its application scenarios are as follows: Figure 2 As shown, Figure 2 The lowest touchdown point of the dynamic cable may be at Figure 2 As shown in A in FIG, the counterweight support body of the present application can be installed at A. Alternatively, after the seabed changes with the ocean current, the lowest touchdown point of the dynamic cable may change, so it can be installed at Figure 2 A counterweight support body is also configured at B to cope with changes in the seabed. The number and size of the counterweight support bodies required for friction weights are determined by the dynamic analysis loads.

[0031] The friction counterweight accessory for a dynamic submarine cable of this embodiment includes a counterweight support body arranged along the axial direction of the dynamic cable, and a through hole is provided in the middle of the counterweight support body for the dynamic cable to pass through.

[0032] In the present application, the counterweight support body includes two Haver-style fixed supports 3, which are arranged opposite to each other and fixed in a butt joint. In this embodiment, one side of the Haver-style fixed support 3 is constructed with an ear plate 2 for the connecting pin 6 to rotate, and the other side of the Haver-style fixed support 3 is constructed with an ear plate. During the butt joint installation, after the two Haver-style fixed supports 3 are docked, the ear plates 2 of the two Haver-style fixed supports 3 are fitted together and the connecting pin 6 is inserted to complete the pivot connection of the two Haver-style fixed supports 3. Then, the ear plates of the two Haver-style fixed supports 3 are fitted together and fixed by the connecting bolt 2.

[0033] The Harvu-style fixed support 3 is a solid metal structure. The outer surface of the counterweight support body is a rectangular parallelepiped. The openings at both ends of the through-hole of the counterweight support body are located on two parallel surfaces of the rectangular parallelepiped. In actual use, the counterweight support body needs to be large and heavy. The actual volume can be selected based on the actual application conditions such as the outer diameter of the cable. The material of the counterweight support body can be selected from metal lead or stainless steel to ensure sufficient deadweight within a certain volume.

[0034] The through hole of the counterweight support body is provided with a plurality of straightening plates 5, all of which are arranged in a ring around the axis of the through hole in the counterweight support body. An adjustment portion is provided between the straightening plates 5 and the counterweight support body, and the straightening plates 5 move in the through hole of the counterweight support body through the adjustment portion.

[0035] In this embodiment, there are four straightening plates 5 in the through hole of the counterweight support body. The four straightening plates 5 are arranged in a ring around the axis of the through hole in the counterweight support body. The screw rods 7 connected to the four straightening plates 5 pass through the four parallel edges of the rectangular body of the counterweight support body respectively.

[0036] The straightening plate 5 is an arc-shaped plate, and the arc opening of the straightening plate 5 faces the axis of the through hole in the counterweight support body and is coaxially arranged with the through hole. The arc-shaped straightening plate 5 can have a larger fitting area with the cable surface, and the effect of fixing the cable is better.

[0037] The straightening plate 5 extends parallel to the axis of the through hole in the counterweight support body. The straightening plate 5 can be as long as possible to effectively prevent bending and deformation of the static section of the dynamic cable. The specific length of the straightening plate 5 can be selected based on actual needs.

[0038] The adjusting part includes a screw rod 7. The counterweight support body is provided with a threaded hole for the screw rod 7 to pass through. The screw rod 7 passes through the threaded hole and is threadedly connected to the threaded hole. The rear end of the screw rod 7 passing through the threaded hole is connected to the straightening plate 5.

[0039] The surface of the straightening plate 5 facing the screw 7 has a screw holder 4, which has an inverted T-slot formed therein. The end of the screw 7 has a connecting piece that plugs into the inverted T-slot of the straightening plate 5. The screw 7 passes through the counterweight support body and is threadedly connected to a nut at the end exposed outside the counterweight support body. A groove is formed on the inner wall of the through hole in the counterweight support body to cooperate with the screw holder 4.

[0040] In this embodiment, the entire structure contains four straightening plates 5, which form a circular ring with a gap. When the static end of the dynamic cable passes through the counterweight support body composed of two Haver-type fixed supports 3, the straightening plate 5 is pressed tightly against the cable by controlling the screw rod 7, and the functional requirement of fixing the cable is achieved by means of tightening pressure.

[0041] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the scope of protection of the present invention.

Claims

1. A friction counterweight accessory for a dynamic submarine cable, comprising a counterweight support body disposed axially along the dynamic cable, the counterweight support body having a through hole in the middle thereof for the dynamic cable to pass through; characterized in that: The counterweight support body comprises two Harvu-type fixed supports (3), and the two Harvu-type fixed supports (3) are arranged opposite to each other and fixedly connected; A plurality of straightening plates (5) are provided in the through hole of the counterweight support body, and all the straightening plates (5) are arranged in a ring shape around the axis of the through hole in the counterweight support body; An adjustment portion is provided between the straightening plate (5) and the counterweight support body, and the straightening plate (5) moves in the through hole of the counterweight support body via the adjustment portion.

2. The friction weight accessory for a dynamic submarine cable according to claim 1, characterized in that: The Havre-type fixed support (3) is a solid metal structure; The outer surface of the counterweight support body is in the shape of a cuboid, and the openings at both ends of the through hole of the counterweight support body are respectively located on two parallel surfaces of the cuboid of the counterweight support body.

3. The friction weight accessory for a dynamic submarine cable according to claim 1, characterized in that: The straightening plate (5) is an arc-shaped plate, and the arc-shaped opening of the straightening plate (5) faces the axis of the through hole in the counterweight support body and is coaxially arranged with the through hole; The length extension direction of the straightening plate (5) is arranged parallel to the axial direction of the through hole in the counterweight support body.

4. The friction weight accessory for a dynamic submarine cable according to claim 1, characterized in that: The adjustment portion comprises a screw rod (7), a threaded hole for the screw rod (7) to pass through is constructed on the counterweight support body, and the screw rod (7) passes through the threaded hole and is threadedly connected to the threaded hole; The screw rod (7) passes through the rear end of the threaded hole and is connected to the straightening plate (5).

5. The friction weight accessory for a dynamic submarine cable according to claim 4, characterized in that: The straightening plate (5) has a screw rod fixing seat (4) on its surface facing the screw rod (7), an inverted T-shaped groove is constructed in the screw rod fixing seat (4), and the end of the screw rod (7) has a connecting piece, which is inserted into the inverted T-shaped groove of the straightening plate (5); The screw rod (7) passes through the counterweight support body and one end exposed outside the counterweight support body is threadedly connected with a nut (1).

6. The friction weight accessory for a dynamic submarine cable according to claim 1, characterized in that: The two Harvu-style fixed supports (3) are pivotally connected via a connecting pin (6); a lug plate is provided on the side of the Harvu-style fixed support (3); the lug plates of the two Harvu-style fixed supports (3) are matched and connected via a connecting bolt (2).

7. The friction weight accessory for a dynamic submarine cable according to claim 5, characterized in that: A groove is constructed on the inner wall of the through hole of the counterweight support body and is arranged to cooperate with the screw rod fixing seat (4).

8. The friction weight accessory for a dynamic submarine cable according to claim 2, characterized in that: Four straightening plates (5) are provided in the through hole of the counterweight support body, and screw rods (7) connected to the four straightening plates (5) respectively pass through four parallel edges of the rectangular parallelepiped of the counterweight support body.

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