Submarine cable back-tow joint structure

Abstract

The application provides a submarine cable back-tow joint structure, comprising: a joint pipe, the joint pipe comprising a hollow pipe body and a first end cover, the first end cover being arranged at one end of the pipe body, the first end cover being provided with a pulling rod, and an inner side wall of the pipe body being provided with a first conical platform; a fixing pipe, the fixing pipe being located in the pipe body, an outer side wall of the fixing pipe being provided with a second conical platform, the second conical platform and the first conical platform clamping a sheath layer; and a connecting piece, the connecting piece being arranged in the joint pipe and located between the first end cover and the fixing pipe, the connecting piece being in abutting fit with the fixing pipe, wherein the connecting piece is provided with a containing hole, and the containing hole is filled with adhesive, which not only avoids the adhesion between the sheath layer of the submarine cable and the joint structure, so that the disassembly operation between the submarine cable and the back-tow joint structure is simple, but also enables the sheath layer and the cable core of the submarine cable to jointly bear the pulling load, significantly reduces the risk of interlayer slip of the submarine cable during back-tow, and simultaneously improves the reliability of the fixation between the back-tow joint structure and the submarine cable.

Description

Technical Field

[0001] This utility model generally relates to the field of submarine cable laying technology, and specifically to a submarine cable back-drag joint structure. Background Technology

[0002] The cable back-pulling operation is an important part of the cable laying operation. The back-pulling process mainly involves: installing a back-pulling joint at the end of the cable, connecting the back-pulling joint to the directional drill rod, and then using the directional drill rod to pull the cable through the directional pipe.

[0003] The current method of connecting the tow joint and the submarine cable typically involves injecting glue between the armor layer of the submarine cable and the tow joint, and then bonding them together using the glue. However, this method presents a problem where the tow joint and the armor layer of the submarine cable are difficult to disassemble. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a submarine cable back-drag joint structure.

[0005] This application provides a submarine cable backhaul joint structure, including:

[0006] The connector tube includes a hollow tube body and a first end cap. The first end cap is located at one end of the tube body and is equipped with a pull rod. The inner wall of the tube body is provided with a first truncated cone surface, and the large-diameter end of the first truncated cone surface is located near the pull rod.

[0007] A fixed tube is located inside the tube body. The outer wall of the fixed tube is provided with a second truncated cone surface. A clamping cavity for clamping the armor layer is formed between the second truncated cone surface and the first truncated cone surface.

[0008] The connector is disposed inside the connector tube and located between the first end cap and the fixed tube. The connector abuts against the fixed tube. The connector has a receiving hole for accommodating the cable core, and the receiving hole extends along the axial direction of the tube body. The receiving hole is filled with adhesive.

[0009] Furthermore, the connector includes a connecting pipe and a connecting disc, the connecting disc and the pipe body are detachably and fixedly connected, the connecting pipe is detachably and fixedly connected to the side of the connecting disc near the fixed pipe, and the end of the connecting pipe away from the first end cap abuts against the fixed pipe.

[0010] Furthermore, the connecting plate is provided with a first mounting through hole that extends along the axial direction, one end of the connecting pipe is inserted into the first mounting through hole, and a first connecting ring is provided on the outer periphery of the connecting pipe. The first connecting ring is located on the side of the connecting plate close to the fixed pipe, and the first connecting ring and the connecting plate are detachably fixedly connected.

[0011] Furthermore, a retaining ring is provided inside the connecting pipe, and a sealing cover is provided at the first end of the connecting pipe away from the fixed pipe. The sealing cover is provided with an injection hole, and an injection cavity is formed between the retaining ring, the sealing cover, and the connecting pipe, and the adhesive is filled in the injection cavity.

[0012] Furthermore, a second connecting ring is provided inside the tube. The second connecting ring is fixedly connected to the inner wall of the tube and is located between the connecting disc and the fixed tube. The connecting disc and the second connecting ring are connected.

[0013] Furthermore, the second connecting ring and the tube body are an integral structure.

[0014] Furthermore, the outer wall of the connecting pipe is provided with an abutting protrusion, and the inner wall of the fixed pipe is provided with a clearance notch that penetrates the fixed pipe along the axial direction. The abutting protrusion abuts against the part of the end face of the fixed pipe that is different from the clearance notch, and the clearance notch allows the abutting protrusion to pass through.

[0015] Furthermore, there are at least two abutting protrusions and two clearance notches, and the two abutting protrusions and two clearance notches are set in a one-to-one correspondence, wherein the two abutting protrusions are symmetrically arranged relative to the axis of the connecting pipe.

[0016] Furthermore, the connector tube also includes a second end cap, which is detachably and fixedly connected to the side of the tube body away from the first end cap. The second end cap is provided with a cable passage hole and a sealing ring is provided inside the cable passage hole.

[0017] Furthermore, the sealing rings are multiple and spaced apart axially along the cable hole.

[0018] The submarine cable back-pull joint structure provided in this application clamps the armor layer of the submarine cable through the first conical frustum of the joint tube and the second conical frustum of the fixing tube. A connector is provided between the first end cap and the fixing tube. The connector abuts against the fixing tube, and the core of the submarine cable is bonded to the connector. This not only avoids adhesion between the armor layer of the submarine cable and the joint structure, making the disassembly operation between the submarine cable and the back-pull joint structure simple, but also allows the armor layer and the core of the submarine cable to jointly bear the tensile load, significantly reducing the risk of interlayer slippage of the submarine cable during back-pull. At the same time, it also improves the reliability of the connection between the submarine cable back-pull joint structure and the submarine cable. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 A schematic diagram of the submarine cable backhaul joint structure provided in this application embodiment when the second drag reduction ring is in the first position;

[0021] Figure 2 for Figure 1AA section view in the middle;

[0022] Figure 3 for Figure 2 Enlarged view of part B in the image. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0024] Please refer to the attached document. Figure 1-3 This application provides a submarine cable backhaul joint structure, including a joint tube 100 and a fixing tube 200. The joint tube 100 includes a hollow tube body 110 and a first end cap 120. The first end cap 120 is disposed at one end of the tube body 110 to cover the end of the tube body 110. The first end cap 120 is provided with a pulling rod 140, which is provided with a traction hole. A directional drilling rod is connected to the traction hole through a shackle to realize the connection between the backhaul joint structure and the directional drilling rod. The inner sidewall of the tube body 110 is provided with a first circular... The truncated cone surface 111 and the fixing tube 200 are located inside the tube body 110. The outer wall of the fixing tube 200 is provided with a second truncated cone surface 201. The large diameter ends of the second truncated cone surface 201 and the first truncated cone surface 111 are both located close to the pulling rod 140. A clamping cavity for clamping the armor layer 410 is formed between the second truncated cone surface 201 and the first truncated cone surface 111, which avoids the bonding between the submarine cable back-towing joint structure and the armor layer 410 of the submarine cable 400, making the disassembly operation between the submarine cable 400 and the back-towing joint structure simple.

[0025] The submarine cable backhaul joint structure also includes a connector, which is disposed inside the joint tube 100 and located between the first end cap 120 and the fixing tube 200. The connector abuts against the fixing tube 200 to prevent relative displacement between the fixing tube 200 and the joint tube 100, ensuring the clamping stability of the first conical frustum 111 and the second conical frustum 201 on the armor layer 410 of the submarine cable 400, and improving the reliability of the connection between the submarine cable backhaul joint structure and the submarine cable 400. The connector is provided with a receiving hole for accommodating the cable core 420, and the receiving hole extends axially along the tube body 110. The receiving hole is filled with adhesive 330, which bonds the cable core 420 inserted into the receiving hole and the connector, so that the armor layer 410 and the cable core 420 of the submarine cable 400 jointly bear the tensile load, significantly reducing the risk of interlayer slippage of the submarine cable 400 during backhaul.

[0026] When connecting the submarine cable 400 and the submarine cable back-to-base joint structure, the end of the submarine cable 400 needs to be stripped to expose the armor layer 410 and the cable core 420 (the cable core 420 is the conductive part of the submarine cable 400). Then, the submarine cable 400 is inserted into the joint tube 100 and the armor layer 410 is placed against the first truncated cone surface 111. Next, the fixing tube 200 is pressed into the joint tube 100 so that the armor layer 410 is clamped between the first truncated cone surface 111 and the second truncated cone surface 201, wherein the cable core 420 moves through the fixing tube 200.

[0027] In some embodiments of this application, the connector includes a connecting tube 310 and a connecting disc 320. The connecting disc 320 and the tube body 110 are detachably and fixedly connected. The connecting tube 310 is fixedly connected to the side of the connecting disc 320 near the fixed tube 200, and the end of the connecting tube 310 away from the first end cap 120 abuts against the fixed tube 200. The detachable and fixed connection between the connecting tube 310 and the connecting disc 320 allows the submarine cable 400 to be bonded only between the cable core 420 and the connecting tube 310 of the connector, further facilitating the assembly and disassembly of the submarine cable 400 pullback joint and the submarine cable 400.

[0028] In some embodiments of this application, the connector tube 100 further includes a second end cap 130, which is detachably fixed to the side of the tube body 110 away from the first end cap 120. Both the first end cap 120 and the tube body 110, and the second end cap 130 and the tube body 110, are screwed together, and sealing gaskets are provided between the first end cap 120 and the tube body 110, and between the second end cap 130 and the tube body 110, to increase waterproof performance. The second end cap 130 has a cable passage hole for the submarine cable 400 to pass through, and a sealing ring 131 is provided inside the cable passage hole to prevent seawater from seeping into the interior. Optionally, multiple sealing rings 131 are provided and spaced apart axially along the cable passage hole.

[0029] In some embodiments of this application, the connecting plate 320 is provided with a first mounting through hole extending along the axial direction, one end of the connecting tube 310 is inserted into the first mounting through hole, the inner cavity of the connecting tube 310 forms a receiving hole, and a first connecting ring 311 is provided on the outer periphery of the connecting tube 310. The first connecting ring 311 is located on the side of the connecting plate 320 near the fixing tube 200, and the first connecting ring 311 and the connecting plate 320 are detachably fixedly connected.

[0030] Optionally, the first connecting ring 311 is provided with a plurality of first connecting holes and the plurality of first connecting holes are spaced apart along the circumference of the first connecting ring 311. The connecting plate 320 is provided with a plurality of second connecting holes that correspond one-to-one with the plurality of first connecting holes. Connecting bolts are inserted into the corresponding first connecting holes and second connecting holes and nuts are screwed onto the connecting bolts to fix the first connecting ring 311 and the connecting plate 320 together.

[0031] In some embodiments of this application, a retaining ring 313 is provided inside the connecting pipe 310, and a sealing cover plate 314 is provided on the first end cap 120 of the connecting pipe 310 away from the fixing pipe 200. The sealing cover plate 314 has an injection hole, wherein an injection cavity is formed between the retaining ring 313, the sealing cover plate 314, and the connecting pipe 310, and the adhesive 330 is filled in the injection cavity. The inner sidewall of the cable core 420 and the retaining ring 313 are in contact to prevent the adhesive 330 from flowing out from the retaining ring 313.

[0032] The rubber retaining ring 313 can be located at one end of the connecting pipe 310 near the fixing pipe 200 or in the middle of the connecting pipe 310.

[0033] In some embodiments of this application, a second connecting ring 150 is provided inside the tube body 110. The second connecting ring 150 is fixedly connected to the inner sidewall of the tube body 110 and is located between the connecting disc 320 and the fixed tube 200, with the connecting disc 320 and the second connecting ring 150 connected together. The connecting disc 320 and the second connecting ring 150 can be screwed together, etc. Optionally, the second connecting ring 150 and the tube body 110 are an integral structure.

[0034] In some embodiments of this application, the outer wall of the connecting pipe 310 is provided with an abutting protrusion 312, and the inner wall of the fixing pipe 200 is provided with a clearance notch and the clearance notch penetrates the fixing pipe 200 along the axial direction of the fixing pipe 200. The abutting protrusion 312 abuts and engages with the portion of the end face of the fixing pipe 200 that is different from the clearance notch, and the clearance notch allows the abutting protrusion 312 to pass through.

[0035] When disassembling the pullback connector structure, first remove the first end cap 120, the second end cap 130 and the connecting plate 320. Then, retract the tube body 110 in the direction close to the second end cap 130 to release the clamping on the armor layer 410. Next, limit the rotation of the fixing tube 200 to align the abutment protrusion 312 and the clearance notch. Then, remove the fixing tube 200. Finally, cut off the part of the cable core 420 to which the connecting tube 310 is glued.

[0036] Optionally, there are at least two abutting protrusions 312 and two clearance notches, and the two abutting protrusions 312 and the two clearance notches are arranged in a one-to-one correspondence. The two abutting protrusions 312 are arranged symmetrically with respect to the axis of the connecting pipe 310 to improve the abutting reliability between the fixing pipe 200 and the connecting pipe 310.

[0037] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A submarine cable backhaul joint structure, characterized in that, include: The connector tube includes a hollow tube body and a first end cap. The first end cap is disposed at one end of the tube body. The first end cap is provided with a pull rod. The inner side wall of the tube body is provided with a first truncated cone surface. The large diameter end of the first truncated cone surface is disposed close to the pull rod. A fixing tube is located inside the tube body. The outer wall of the fixing tube is provided with a second truncated cone surface, and a clamping cavity for clamping the armor layer is formed between the second truncated cone surface and the first truncated cone surface. A connector is disposed inside the connector tube and located between the first end cap and the fixing tube. The connector abuts against the fixing tube. The connector has a receiving hole for accommodating the cable core, and the receiving hole extends axially along the tube body. The receiving hole is filled with adhesive.

2. The submarine cable back-to-base joint structure according to claim 1, characterized in that, The connector includes a connecting pipe and a connecting disc. The connecting disc and the pipe body are detachably and fixedly connected. The connecting pipe is detachably and fixedly connected to the side of the connecting disc near the fixed pipe, and the end of the connecting pipe away from the first end cap abuts against the fixed pipe.

3. The submarine cable backhaul joint structure according to claim 2, characterized in that, The connecting plate is provided with a first mounting through hole that extends along the axis. One end of the connecting tube is inserted into the first mounting through hole. A first connecting ring is provided on the outer periphery of the connecting tube. The first connecting ring is located on the side of the connecting plate close to the fixed tube, and the first connecting ring and the connecting plate are detachably fixedly connected.

4. The submarine cable back-to-base joint structure according to claim 3, characterized in that, The connecting pipe is provided with a glue-blocking ring, and the first end of the connecting pipe away from the fixed pipe is covered with a sealing cover plate. The sealing cover plate is provided with an injection hole. An injection cavity is formed between the glue-blocking ring, the sealing cover plate and the connecting pipe, and the adhesive is filled in the injection cavity.

5. The submarine cable back-to-base joint structure according to claim 3, characterized in that, The tube body is provided with a second connecting ring, which is fixedly connected to the inner side wall of the tube body. The second connecting ring is located between the connecting plate and the fixed tube, and the connecting plate and the second connecting ring are connected.

6. The submarine cable backhaul joint structure according to claim 5, characterized in that, The second connecting ring and the tube body are an integral structure.

7. The submarine cable back-to-base joint structure according to claim 2, characterized in that, The outer wall of the connecting pipe is provided with an abutting protrusion, and the inner wall of the fixing pipe is provided with a clearance notch, which penetrates the fixing pipe along the axial direction. The abutting protrusion abuts against the portion of the end face of the fixing pipe that is different from the clearance notch, and the clearance notch allows the abutting protrusion to pass through.

8. The submarine cable backhaul joint structure according to claim 7, characterized in that, There are at least two abutting protrusions and two clearance notches, and the two abutting protrusions and two clearance notches are arranged in a one-to-one correspondence, wherein the two abutting protrusions are arranged symmetrically with respect to the axis of the connecting pipe.

9. The submarine cable backhaul joint structure according to any one of claims 1-8, characterized in that, The connector tube also includes a second end cap, which is detachably and fixedly connected to the side of the tube body away from the first end cap. The second end cap has a cable passage hole and a sealing ring is provided in the cable passage hole.

10. The submarine cable back-to-base joint structure according to claim 9, characterized in that, The sealing rings are multiple and spaced apart along the axial direction of the cable hole.

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