Submarine cable anchoring device adopting external leading type grounding

Abstract

The invention relates to a submarine cable anchoring device adopting external leading type grounding, and the device comprises a copper wire net which wraps the outer surface of an armored steel wire. The pressing plate is tightly pressed and attached to the base plate through the first bolt assembly. Non-linear inwards-concave channels are formed between the base plate and the pressing plate. The armored steel wires wrapped with the copper wire nets penetrate through and are fixed in the inwards-concave channels which are in one-to-one correspondence. The armored steel wire can be effectively fixed, a large fixing force value can be provided, the reliability and the stability of the submarine cable are greatly improved, the contact position of the submarine cable anchoring device and the armored steel wire of the submarine cable is designed to be an inwards-concave channel, the outer surface of the armored steel wire is wrapped with a copper wire net, and therefore the contact area of the armored steel wire and the submarine cable anchoring device is increased; contact resistance is reduced, contact reliability is enhanced, abnormal temperature rise at the armored grounding position is avoided, and the risk of insulation breakdown of the submarine cable is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cable fixing, and in particular to a submarine cable anchoring device adopting external grounding. Background Art

[0002] Submarine cables are the main arteries for offshore wind power transmission and are key equipment for ensuring the continuous delivery of clean energy. The armor layer, as the first barrier of the submarine cable, provides tension stability and mechanical protection for the submarine cable, ensuring that the submarine cable is not damaged by external forces and can operate safely.

[0003] Due to the particularity of the submarine cable operating environment, the metal sheaths and armor joints at both ends of the submarine cable are usually connected in parallel and then directly grounded on site. At this time, a considerable current will be generated in the metal sheath and armor layer, accompanied by large losses, causing the outer sheath of the submarine cable to heat up and limit the current carrying capacity of the submarine cable. Therefore, in the project, the submarine cable anchoring device is often used to strip the armored steel wire of the landing section cable to reduce the heating problem of the landing section of the single-core submarine cable and increase the current carrying capacity of the submarine cable.

[0004] The anchoring device of the submarine cable needs to consider not only the uniform compression and compaction of the armored steel wire and the large contact area, but also the grounding reliability. At present, various submarine cable anchoring devices mainly consider the mechanical properties of the anchoring device to ensure the firmness of the anchoring device;

[0005] For example, the "a submarine cable anchoring device" disclosed in patent announcement number CN215681732U ensures complete contact between the cable protection mechanism, anchoring mechanism and sealing mechanism through the connection structure of the three, and extends a section of the original anchoring grounding point for bridging, so that the anchoring performance is not affected, the grounding area is increased, and the cable pipe and the sealing can be better connected, thereby better improving the grounding problem between the cable protection pipe and the anchor.

[0006] However, when stripping the armored steel wire of the landing section cable, the existing submarine cable anchoring device only considers the uniform compression and compaction of the armored steel wire, and often fails to fully consider the heat dissipation of the outer sheath during cable operation. The problem of better heat dissipation of the armored steel wire is not solved, resulting in a reduction in the current carrying capacity of the submarine cable;

[0007] At the same time, the current grounding methods for submarine cable anchoring devices are all fixed grounding, which is a single grounding method. When the grounding effect is poor in some areas due to soil problems, the grounding position cannot be freely selected to flexibly respond to the grounding requirements under different soils. Summary of the invention

[0008] In view of the deficiencies in the prior art, the present invention provides a submarine cable anchoring device using external grounding to solve the above problems.

[0009] The present invention provides the following technical solutions:

[0010] A submarine cable anchoring device using external grounding, characterized by comprising:

[0011] Copper wire mesh, the copper wire mesh is wrapped around the outer surface of the armored steel wire;

[0012] A pressing plate, the pressing plate being pressed and fitted on the backing plate by a first bolt assembly;

[0013] A non-linear concave channel is formed between the pad and the pressing plate, and the armored steel wires wrapped around the copper wire mesh are passed through and fixed in the one-to-one corresponding concave channels.

[0014] Preferably, it further comprises an upper sleeve and a lower sleeve, wherein a passage for the submarine cable to pass through is formed between the upper sleeve and the lower sleeve, and the upper sleeve and the lower sleeve are both provided with corresponding pads.

[0015] Preferably, the upper sleeve is mounted on the lower sleeve via a second bolt assembly, and the lower sleeve is fixed to the base.

[0016] Preferably, a plurality of groups of the concave channels are arranged in a circular array.

[0017] Preferably, the copper wire mesh is spirally wound along the length direction of the armored steel wire.

[0018] Preferably, the copper wire mesh is folded in half to form a double-layer structure, a flexible pad layer is arranged on the inner side of the copper wire mesh, the flexible pad layer is in a "U"-shaped structure, and the opening side of the flexible pad layer in the "U"-shaped structure is arranged on the same side as the opening side of the folded copper wire mesh.

[0019] Preferably, the two opposing inner walls of the flexible cushion layer of the "U"-shaped structure abut against each other and form a heat dissipation channel along the length direction of the copper wire mesh.

[0020] Preferably, a clamping column extending to the outside of the copper wire mesh is provided at one end of the flexible cushion layer, and the clamping column and the opening side of the folded copper wire mesh are located on opposite sides.

[0021] Preferably, the clamping column comprises a connecting portion and an arrow portion, the connecting portion and the arrow portion are connected via a rotating shaft, the connecting portion and the arrow portion are relatively inclined, and the rotating shaft and the arrow portion are interference fit.

[0022] Preferably, the grounding point of the submarine cable anchoring device is connected to an external lead-in device via a grounding wire;

[0023] The external-lead device comprises a movable sleeve and a grounding plate arranged outside the movable sleeve, the grounding plate is in a sickle-shaped or L-shaped structure, and the movable sleeve is arranged on the submarine cable.

[0024] The present invention has the following beneficial technical effects:

[0025] The present invention is easy and convenient to operate, can effectively fix the armored steel wire and provide a large fixing force value, and can unidirectionally fix the submarine cable at the landing end, thereby greatly improving the reliability and stability of the submarine cable and not affecting the performance of the submarine cable core; and the contact position between the submarine cable anchoring device and the submarine cable armored steel wire is designed to be an inward concave channel, and a copper wire mesh is wrapped around the outer surface of the armored steel wire, so that the contact area between the armored steel wire and the submarine cable anchoring device is increased, the contact resistance is reduced, the contact reliability is enhanced, the abnormal temperature increase at the armor grounding point is avoided, and the risk of submarine cable insulation breakdown is reduced.

[0026] A sickle-shaped / L-shaped grounding plate is used for grounding. By adjusting the relative position of the grounding plate to the movable sleeve, the grounding point position can be freely adjusted, and the buried depth of the horizontal grounding body can be increased. The external grounding device is connected to the fixed end of the submarine cable anchoring device to achieve the effect of adjusting the grounding point and increasing its grounding stability, avoiding excessive current events caused by high soil resistivity or poor grounding at the location of the anchoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the submarine cable anchoring device of the present invention;

[0028] Figure 2 is a cross-sectional view of a submarine cable anchoring device of the present invention;

[0029] Figure 3 yes Figure 2 A partial schematic diagram of

[0030] Figure 4 It is a schematic diagram of the structure of the external introduction device of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the copper wire mesh of the present invention;

[0032] Figure 6 yes Figure 5 A schematic diagram of a local A enlargement;

[0033] Figure 7 It is a schematic diagram of the clamping column structure of the present invention.

[0034] The reference numerals in the figure are:

[0035] 1. Base; 2. Lower sleeve; 3. Upper sleeve; 4. Pad; 5. Press plate; 6. First bolt assembly; 7. Movable sleeve; 71. Grounding plate; 8. Copper wire mesh; 81. Opening side; 9. Flexible cushion layer; 91. Slot; 92. Column;

[0036] 921, connecting portion; 922, rotating shaft; 923, arrow portion;

[0037] 100. Submarine cable; 200. Armored steel wire. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example:

[0040] A submarine cable anchoring device using external grounding, such as Figure 1-7 As shown:

[0041] It includes a base 1, a lower sleeve 2, an upper sleeve 3, a pad 4, a pressing plate 5, a first bolt assembly 6, a copper wire mesh 8 and a flexible pad 9.

[0042] The lower sleeve 2 is fixed to the base 1, and the upper sleeve 3 is installed on the lower sleeve 2 through the second bolt assembly, and a channel compatible with the submarine cable 100 is formed between the lower sleeve 2 and the upper sleeve 3; corresponding pads 4 are fixed to the same end of the lower sleeve 2 and the upper sleeve 3, and the two groups of pads 4 are combined to cooperate with the pressure plate 5.

[0043] The side where the pad 4 and the pressure plate 5 are close to each other is non-planar and fits each other. When the pad 4 and the pressure plate 5 are in contact, a plurality of concave channels are formed. The concave channels are evenly arranged around the circumference of the submarine cable 100, and the number of the concave channels corresponds to the number of the armored steel wires 200. Figure 3 As shown, the trajectory of the concave channel is non-straight.

[0044] like Figure 5-6 As shown, the copper wire mesh 8 is folded in half to form a U-shaped double-layer structure, and a flexible pad layer 9 is arranged on the inner side of the folded copper wire mesh 8. The flexible pad layer 9 is in a U-shaped structure, and the opening side of the flexible pad layer 9 is in the same direction as the opening side of the copper wire mesh 8. The flexible pad layer 9 with the U-shaped structure has two opposite inner protrusions arranged to form a protrusion. Under normal circumstances, a certain distance is left between the protrusions of the opposite side walls. The opening side of the flexible pad layer 9 with the U-shaped structure forms a one-way slot structure for one-way insertion and clamping with the clamping column 92, and the clamping column 92 in the clamped state can still move in the one-way slot of the flexible pad layer 9.

[0045] like Figure 7 As shown, the clamping column 92 includes a connecting portion 921, a rotating shaft 922, and an arrow portion 923. One end of the connecting portion 921 is fixedly connected to the flexible cushion layer 9, and the other end of the connecting portion 921 extends through the mesh of the copper wire mesh 8 to the outside of the copper wire mesh 8 and is provided with a rotating shaft 922. The rotating shaft 922 and the arrow portion 923 are in an interference rotation fit. Under normal circumstances, the connecting portion 921 and the arrow portion 923 are both flat structures and are relatively inclined under normal circumstances.

[0046] like Figure 4 As shown, the external-lead device includes a movable sleeve 7 and a grounding plate 71. The grounding plate 71 is in a sickle-shaped or L-shaped structure. The movable sleeve 7 is sleeved on the submarine cable 100. The lateral end of the grounding plate 71 moves relatively to the movable sleeve 7.

[0047] During installation, the submarine cable armor is first stripped off, and according to the overall length of the submarine cable anchoring device, the outer PP rope is stripped off and the asphalt on the armored steel wire 200 is cleaned with stearic acid;

[0048] Fix the base 1, according to the position of the connection hole on the base 1, drill holes in the ground foundation and insert expansion screws, and fix the lower part of the base 1 on the foundation through the connection hole;

[0049] The submarine cable 100 is lifted and inserted into the channels of the lower sleeve 2 and the upper sleeve 3. The lower sleeve 2 and the upper sleeve 3 are connected and fixed by a second bolt assembly, so that the three are fixedly connected as one;

[0050] Bend the armored steel wire 200 into a shape that matches the contour of the concave channel, cut the steel wire armor at an appropriate position according to the overall length of the anchor, fold the armored steel wire 200, wrap the copper wire mesh 8 around the outer surface of the armored steel wire 200, and after wrapping, tie the two ends with copper wire, then place the armored steel wire 200 in the concave channel of the pad 4, and avoid the bolt holes. Then, press the pressing plate 5 to fix it on the two groups of pads 4 through the first bolt assembly 6;

[0051] The grounding plate 71 is connected to the grounding terminal on the base 1 through a grounding wire. The movable sleeve 7 is arranged on the submarine cable 100 and can be extended to the target grounding point according to actual conditions and then fixed. Then the grounding plate 71 is inserted into the ground for grounding.

[0052] The copper wire mesh 8 is spirally wound around the outer wall of the armored steel wire 200 to avoid overlapping, and then the clamping column 92 is pushed to be inserted into the open end of the flexible cushion layer 9. The flexible cushion layer 9 with a U-shaped structure has a certain elastic deformation ability to facilitate the insertion of the arrow portion 923 of the clamping column 92 into its open end, thereby achieving the copper wire mesh 8 without overlap and gap, and spirally wound around the outer wall of the armored steel wire 200, so that the copper wire mesh 8 wrapped around the outer wall of the armored steel wire 200 has a uniform thickness at various locations, avoiding the problem of uneven force caused by the uneven thickness of the copper wire mesh 8.

[0053] The flexible cushion layer 9 of the U-shaped structure has a certain elastic deformation ability, which is conducive to temporarily storing the armored steel wire 200 wrapped with the copper wire mesh 8 in the partially concave channel of the pad 4. When the armored steel wire 200 and the copper wire mesh 8 of the outer wall are clamped by the pressing plate 5 and the pad 4, a certain pressure is also applied to the flexible cushion layer 9 of the U-shaped structure, so that the convex parts on the opposite sides of the flexible cushion layer 9 of the U-shaped structure are close to each other and abut against each other. The abutting convex parts provide support for the flexible cushion layer 9 and the copper wire mesh 8 and form a heat dissipation channel;

[0054] Under normal circumstances, in order to ensure that the arrow portion 923 can be smoothly inserted into the open side of the folded copper wire mesh 8, under the action of the flexible pad 9 with a certain elasticity, the width of the open side of the copper wire mesh 8 is slightly larger than the width of other parts. At the same time, during the process of the opposite sides of the flexible pad 9 of the U-shaped structure approaching each other, pressure is applied to the arrow portion 923. The arrow portion 923 is subjected to pressure to overcome the interference fit force between the arrow portion 923 and the rotating shaft 922, so that the arrow portion 923 rotates to be flush with the connecting portion 921, thereby reducing the distance between the copper wire mesh 8 and the open side of the flexible pad 9, so that the thickness of the copper wire mesh 8 is basically the same at various places. At this time, it does not matter even if the arrow portion 923 loses the snap fit with the slot 91 of the flexible pad 9.

[0055] The folded copper wire mesh 8 has a larger surface area than a single-layer copper wire mesh, which helps to dissipate heat more effectively. At the same time, the inner side of the folded copper wire mesh 8 is supported by the flexible pad layer 9 and the heat dissipation channel, which helps to dissipate heat more effectively.

[0056] By adding a flexible cushion layer 9 on the inner side of the folded copper wire mesh 8, the flexibility of the double-layer copper wire mesh 8 can be increased, making it less likely to crack or break when bent, thereby improving the bending resistance; at the same time, the flexible cushion layer 9 can also disperse stress, reduce stress concentration points, and further improve the stability and durability of the structure.

[0057] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A submarine cable anchoring device using external grounding, characterized in that: include: A copper wire mesh (8), wherein the copper wire mesh (8) is wrapped around the outer surface of the armored steel wire (200); A pressing plate (5), wherein the pressing plate (5) is pressed tightly against the backing plate (4) by a first bolt assembly (6); A non-linear concave channel is formed between the pad (4) and the pressing plate (5), and the armored steel wires (200) wrapped around the copper wire mesh (8) are passed through and fixed in the one-to-one corresponding concave channels.

2. A submarine cable anchoring device using external grounding according to claim 1, characterized in that: It also comprises an upper sleeve (3) and a lower sleeve (2), wherein a passage for the submarine cable (100) to pass through is formed between the upper sleeve (3) and the lower sleeve (2), and the upper sleeve (3) and the lower sleeve (2) are both provided with corresponding pads (4).

3. A submarine cable anchoring device using external grounding according to claim 2, characterized in that: The upper sleeve (3) is mounted on the lower sleeve (2) via a second bolt assembly, and the lower sleeve (2) is fixed to the base (1).

4. A submarine cable anchoring device using external grounding according to claim 1, characterized in that: A plurality of groups of the concave channels are arranged in a circular array.

5. A submarine cable anchoring device using external grounding according to claim 1, characterized in that: The copper wire mesh (8) is spirally wound along the length direction of the armored steel wire (200).

6. A submarine cable anchoring device using external grounding according to claim 5, characterized in that: The copper wire mesh (8) is folded in half to form a double-layer structure, a flexible cushion layer (9) is arranged on the inner side of the copper wire mesh (8), the flexible cushion layer (9) is in a "U"-shaped structure, and an opening side of the flexible cushion layer (9) in the "U"-shaped structure is arranged on the same side as an opening side of the folded copper wire mesh (8).

7. A submarine cable anchoring device using external grounding according to claim 6, characterized in that: The two opposing inner walls of the flexible cushion layer (9) of the "U"-shaped structure abut against each other and form a heat dissipation channel along the length direction of the copper wire mesh (8).

8. A submarine cable anchoring device using external grounding according to claim 6, characterized in that: One end of the flexible cushion layer (9) is provided with a clamping column (92) extending to the outside of the copper wire mesh (8), and the clamping column (92) and the opening side of the flexible cushion layer (9) of the "U"-shaped structure are located on opposite sides and are unidirectionally clamped together.

9. A submarine cable anchoring device using external grounding according to claim 8, characterized in that: The clamping column (92) comprises a connecting portion (921) and an arrow portion (923); the connecting portion (921) and the arrow portion (923) are connected via a rotating shaft (922); the connecting portion (921) and the arrow portion (923) are arranged to be inclined relative to each other; and the rotating shaft (922) and the arrow portion (923) are interference fit.

10. A submarine cable anchoring device using external grounding according to claim 1, characterized in that: The grounding point of the submarine cable anchoring device is connected to an external lead-in device via a grounding wire; The external-lead device comprises a movable sleeve (7) and a grounding plate (71) arranged outside the movable sleeve (7), wherein the grounding plate (71) is in a sickle-shaped or L-shaped structure, and the movable sleeve (7) is sleeved on the submarine cable (100).

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