Submarine cable traction guide device and submarine cable back-dragging construction method

Abstract

The invention relates to the technical field of submarine cable laying, and discloses a submarine cable traction guide device and a submarine cable back-dragging construction method, and the submarine cable traction guide device comprises a pipeline, a traction mechanism and a plurality of groups of guide mechanisms. The pipeline is arranged in the directional hole, and two ends are respectively an inlet end and an outlet end. And the traction mechanism is arranged at the bottom of the pipeline, is suitable for arranging a submarine cable and is used for dragging the submarine cable from the inlet end to the outlet end. The guiding mechanisms are arranged at intervals in the axial direction of the pipeline, each guiding mechanism comprises a plurality of guiding pieces arranged at intervals in the circumferential direction of the pipeline, each guiding piece comprises a fixed part and a rotating part which are connected, the fixed parts are connected with the inner wall of the pipeline, the rotating parts make contact with the outer wall of the submarine cable, and the submarine cable drives the rotating parts to rotate when moving. When the submarine cable is dragged back, rolling friction exists between the submarine cable and the guiding piece, the submarine cable cannot make contact with the inner wall of the pipeline, friction force is smaller, the probability of damage to the submarine cable is small, meanwhile, power needed for dragging the submarine cable is reduced, and the energy-saving effect can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable laying, and in particular to a submarine cable traction guiding device and a submarine cable backhaul construction method. Background Art

[0002] Horizontal directional drilling construction is a trenchless drilling technology used to lay underground pipelines and cables without damaging the ground surface. Compared with traditional open-cut laying construction, directional drilling construction maximally solves the impact on the ground environment, buildings and traffic, and the overall construction is not restricted by climate and terrain. It has the characteristics of short project cycle, good economic benefits, safety and reliability, and is widely used in the pipeline laying construction of water, gas, electricity, oil, etc. With the increasing number of offshore wind power and other marine engineering projects, as a very important construction link in each marine engineering project, the use of directional drilling construction for submarine cable laying effectively avoids various restrictive impacts in the near-shore and landing sections, and has good construction safety and economy.

[0003] The directional drilling construction process of submarine cables generally includes steps such as pilot hole crossing, reaming construction, steel pipe backhaul construction, and submarine cable backhaul construction. Among them, pilot hole crossing is to first complete the drilling of the pilot hole through the drilling rig, and the reaming construction process is to use a reamer to ream the pilot hole until it meets the requirements for pipeline backhaul. The steel pipe backhaul construction generally mainly has two types: land-to-sea backhaul or sea-to-land backhaul. Since a barge and a positioning anchor machine need to be arranged at the offshore exit point during the land-to-sea backhaul process, the sea-to-land backhaul of the pipeline is usually selected, that is, the pipeline is backhauled from the ocean to the land direction in the directional hole. The submarine cable backhaul is to backhaul the submarine cable from inside the pipeline, and this process is the link with the highest construction risk in the entire directional drilling construction process. Since the inner surface of the steel pipe is not smooth and flat due to welding burrs and other reasons, there is a risk that the submarine cable will be damaged or broken due to friction between the submarine cable and the inner wall of the pipeline during the backhaul of the submarine cable in the steel pipe. Summary of the Invention

[0004] In view of this, the present invention provides a submarine cable traction guiding device and a submarine cable backhaul construction method to solve the problem that the submarine cable is damaged or broken due to friction with the inner wall of the pipeline during the backhaul of the submarine cable in the pipeline during the directional drilling construction process.

[0005] In a first aspect, the present invention provides a submarine cable traction guiding device, including:

[0006] A pipeline, the pipeline is arranged in the directional hole, one end is the inlet end, and the other end is the outlet end;

[0007] A traction mechanism, the traction mechanism is arranged at the bottom of the pipeline, the traction mechanism is suitable for setting the submarine cable, and the traction mechanism is used to drag the submarine cable from the inlet end to the outlet end;

[0008] Multiple groups of guiding mechanisms are provided. The multiple groups of guiding mechanisms are arranged at intervals along the axial direction of the pipeline. Each group of guiding mechanisms includes a plurality of guiding members arranged at intervals along the circumferential direction of the pipeline. Each guiding member includes a connected fixing portion and a rotating portion. The fixing portion is connected to the inner wall of the pipeline, and the rotating portion contacts the outer wall of the submarine cable. When the submarine cable moves, it drives the rotating portion to rotate.

[0009] Beneficial effects

[0010] The traction mechanism can provide power to drag the submarine cable to move in the pipeline. Moreover, since a plurality of guiding members are arranged on the inner wall of the pipeline, the submarine cable does not directly contact the inner wall of the pipeline. Therefore, when the submarine cable is towed back, it will not be damaged by the friction of the uneven inner wall of the pipeline. And the friction between the submarine cable and the guiding member is rolling friction. Compared with the way of sliding friction contact between the submarine cable and the inner wall of the pipeline, the friction force is smaller, the probability of damage to the submarine cable is smaller, and at the same time, the power required to drag the submarine cable will also become smaller, and it can also achieve the effect of energy saving.

[0011] In an alternative embodiment, the traction mechanism includes: a conveyor belt, a plurality of rotating cylinders, and two driving devices. The plurality of rotating cylinders are arranged at intervals along the axial direction of the pipeline. The two driving devices are respectively connected to two of the rotating cylinders close to the inlet end and the outlet end. The conveyor belt is wound around the rotating cylinders.

[0012] Beneficial effects

[0013] The driving device drives the rotating cylinder to rotate, and then drives the conveyor belt to rotate back and forth to tow the submarine cable. This belt-type traction mechanism has less impact vibration and a stable transmission process.

[0014] In an alternative embodiment, the traction mechanism further includes: two braking devices, and the two braking devices are respectively connected to two of the rotating cylinders close to the inlet end and the outlet end.

[0015] Beneficial effects

[0016] By arranging braking devices on the two rotating cylinders at the inlet end and the outlet end, the traction mechanism can be controlled to stop working in the ocean, and can also be controlled to stop working on land. The controllability is stronger, ensuring the smooth and safe progress of the submarine cable towing process.

[0017] In an alternative embodiment, a window is provided on the conveyor belt, and a fixing rod is arranged in the window.

[0018] In an alternative embodiment, the submarine cable guiding device further includes: a guiding rope, one end of the guiding rope is connected to the end of the submarine cable, and the other end is connected to the fixing rod.

[0019] Beneficial effects

[0020] By setting a guiding rope to guide the submarine cable, the submarine cable can be guided to ensure that the submarine cable is successfully towed back along the established direction.

[0021] In an alternative embodiment, an installation groove is formed at the bottom of the pipeline, and the traction mechanism is arranged in the installation groove.

[0022] In an alternative embodiment, each set of the guiding mechanisms includes three guiding members.

[0023] Advantageous effects

[0024] Setting three guiding members can limit and guide the submarine cable from above, left and right sides of the submarine cable, with a comprehensive wrapping range, ensuring the stable progress of the submarine cable towing process and preventing the submarine cable from contacting and rubbing against the inner wall of the pipeline.

[0025] In an alternative embodiment, the guiding member is a pulley.

[0026] Advantageous effects

[0027] The sliding resistance of the pulley is small and will not hinder the towing of the submarine cable, ensuring the smooth and stable progress of the submarine cable towing work.

[0028] Second, the present invention also provides a construction method for towing a submarine cable, which is applied to the submarine cable traction guiding device, and includes the following steps:

[0029] Arrange the traction mechanism and the guiding mechanism in the pipeline;

[0030] Arrange the pipeline in the directional hole;

[0031] Start the traction mechanism to drag the submarine cable from the inlet end to the outlet end of the pipeline.

[0032] Advantageous effects

[0033] Since this construction method for towing a submarine cable applies the submarine cable traction guiding device, it has the same technical effects as the submarine cable traction guiding device, which will not be elaborated here.

[0034] In an alternative embodiment, between the steps of arranging the pipeline in the directional hole and starting the traction mechanism to drag the submarine cable from the inlet end to the outlet end of the pipeline, it further includes: connecting one end of the guiding rope to the end of the submarine cable and the other end to the fixed rod. Description of the drawings

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 Schematic diagram of the submarine cable traction guiding device according to an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of another perspective of the submarine cable traction guiding device according to an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of the position of the guiding mechanism and the submarine cable in the submarine cable traction guiding device according to an embodiment of the present invention;

[0039] Figure 4 Schematic diagram of the traction mechanism in the submarine cable traction guiding device according to an embodiment of the present invention;

[0040] Figure 5 Schematic diagram of the transmission belt in the submarine cable traction guiding device according to an embodiment of the present invention.

[0041] Explanation of reference numerals:

[0042] 1. Pipeline;

[0043] 2. Traction mechanism, 21. Conveyor belt, 211. Window, 212. Fixed rod, 22. Rotating cylinder, 23. Braking device;

[0044] 3. Submarine cable;

[0045] 4. Guiding mechanism, 41. Guiding member;

[0046] 5. Guiding rope. Specific embodiments

[0047] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] The construction of the submarine cable by directional drilling is an innovative underground crossing construction method and a commonly used construction method for submarine cable laying at the present stage. Among them, the backhaul of the submarine cable is the most important and difficult step in the whole construction process. Since there are inevitably welding burrs on the inner wall of the steel pipe during construction and the whole inner wall surface is not smooth enough, it is also an unrealistic operation to clean the inner wall of the steel pipe before the backhaul of the submarine cable. Therefore, during the backhaul of the submarine cable, sliding friction will occur with the inner wall surface of the steel pipe, and there will be a risk of scratching or even breaking the submarine cable.

[0052] To solve the above problems, this embodiment provides a submarine cable traction guiding device, which conducts traction and guiding during the backhaul construction of the submarine cable, assists the backhaul construction of the submarine cable, protects the submarine cable from being damaged, and has good economic benefits and application prospects.

[0053] The following combines Figures 1 to 5 , to describe the embodiments of the present invention.

[0054] According to an embodiment of the present invention, on the one hand, a submarine cable traction guiding device is provided, which includes: a pipeline 1, a traction mechanism 2, and multiple groups of guiding mechanisms 4. The pipeline 1 is arranged in a directional hole, one end thereof is an inlet end, and the other end is an outlet end. The traction mechanism 2 is arranged at the bottom of the pipeline 1, and a submarine cable 3 is adapted to be arranged on the traction mechanism 2. The traction mechanism 2 is used to drag the submarine cable 3 from the inlet end to the outlet end. Multiple groups of guiding mechanisms 4 are arranged at intervals along the axial direction of the pipeline 1. Each group of guiding mechanisms 4 includes a plurality of guiding members 41 arranged at intervals along the circumferential direction of the pipeline 1. The guiding member 41 includes a connected fixing portion and a rotating portion. The fixing portion is connected to the inner wall of the pipeline 1, and the rotating portion is in contact with the outer wall of the submarine cable 3, and the rotating portion rotates when the submarine cable 3 moves.

[0055] The pipeline 1 generally adopts a hollow steel pipe. Since the laying of the submarine cable 3 is generally from land to sea and the construction distance is relatively long, the overall length of the pipeline 1 is also relatively long. The pipeline 1 can be divided into multiple sections and welded together into a whole. The cross-section of the pipeline 1 is circular, but its whole is not necessarily straight, and it can be set as an inclined pipe or a bent pipe with a certain bending angle according to the shape of the directional hole. After the directional hole is formed by the guiding hole drilling and reaming operations, the pipeline 1 is dragged back and left in the directional hole to facilitate the subsequent back-dragging construction of the submarine cable 3. During the construction process, the pipeline 1 can protect the submarine cable 3. The traction mechanism 2 mainly provides power for the back-dragging of the submarine cable 3. The submarine cable 3 is heavy and long, and the traction mechanism 2 should have a powerful traction force sufficient to pull the submarine cable 3 from the inlet end of the pipeline 1 to the outlet end. Multiple groups of guiding mechanisms 4 are arranged at intervals along the axial direction of the pipeline 1, and the spacing of the guiding mechanisms 4 is adjusted according to the diameter of the submarine cable 3. Each group of guiding components includes a plurality of guiding members 41, which are arranged on the inner wall of the pipeline 1 along the periphery of the submarine cable 3. After the guiding members 41 are arranged, the submarine cable 3 is in contact with the guiding members 41, and the friction between the submarine cable 3 and the guiding members 41 is rolling friction when the submarine cable 3 is dragged, that is, the rotating portion of the guiding member 41 rotates when the submarine cable 3 is dragged.

[0056] Since the traction mechanism 2 is arranged at the bottom of the submarine cable 3 and a plurality of guiding members 41 are arranged around the submarine cable 3, the submarine cable 3 no longer contacts the inner wall of the pipeline 1 during the back-dragging process, so it will not be scratched by the inner wall of the pipeline 1. And the submarine cable 3 has rolling friction with the guiding members 41 during the back-dragging process. Compared with the setting method where the submarine cable 3 has sliding friction with the inner wall of the pipeline 1, the friction resistance is smaller, the traction power of the submarine cable 3 is also smaller, and energy can be saved.

[0057] In one embodiment, an installation groove is opened at the bottom of the pipeline 1, and the traction mechanism 2 is arranged in the installation groove.

[0058] An installation groove is provided at the bottom of the inner wall of the pipeline 1. The installation groove is a long groove with a rectangular cross-section, and its extending direction is consistent with the axial direction of the pipeline 1. The traction mechanism 2 is detachably arranged in the installation groove, so that the traction mechanism 2 can be recycled and reused.

[0059] In one embodiment, the traction mechanism 2 includes: a conveyor belt 21, a plurality of rollers 22, and two driving devices. The plurality of rollers 22 are arranged at intervals along the axial direction of the pipeline 1. The two driving devices are respectively connected to the two rollers 22 near the inlet end and the outlet end. The conveyor belt 21 is wound around the rollers 22.

[0060] The traction mechanism 2 is a belt drive mechanism. During the operation of the belt drive mechanism, it can reduce impact, absorb vibration, and the transmission is more stable. Specifically, the traction mechanism 2 includes: a conveyor belt 21, a plurality of rollers 22, and two driving devices. The plurality of rollers 22 are arranged at intervals in the installation groove of the pipeline 1. The transmission belt is wound around these rollers 22 in sequence. Among them, the two rollers 22 at the ends, that is, the two rollers 22 near the inlet end and the outlet end of the pipeline 1, are connected to the driving devices and can rotate actively under the drive of the driving devices, while the rollers 22 between these two rollers 22 rotate passively. The submarine cable 3 is arranged on the conveyor belt, and thus the submarine cable 3 can be gradually dragged from the inlet end to the outlet end.

[0061] In one embodiment, the traction mechanism 2 further includes: two braking devices 23. The two braking devices 23 are respectively connected to the two rollers 22 near the inlet end and the outlet end.

[0062] Two braking devices 23 are provided in the same way as the driving devices, and they are also correspondingly connected to the two rollers 22 near the inlet end and the outlet end of the pipeline 1, so that braking can be performed immediately to stop the traction process.

[0063] As a conventional mechanical transmission method, the conveyor belt 21, rollers 22, driving devices, and braking devices 23 included in the traction mechanism 2 in this embodiment can all select existing mature products, which will not be elaborated here.

[0064] Furthermore, both the driving device and the traction mechanism 2 can be remotely controlled by remote control, and the operation is more convenient.

[0065] Two driving devices and two braking devices 23 are provided, and both can be remotely controlled, which is convenient to control the traction mechanism 2 both at sea and on land, and the construction process is more controllable and safer.

[0066] In other embodiments, the traction mechanism 2 can also be other transmission mechanisms, as long as it can realize the transmission and movement of the submarine cable 3.

[0067] In one embodiment, a window 211 is provided on the conveyor belt 21, and a fixing rod 212 is arranged in the window 211.

[0068] The window 211 on the conveyor belt can be square, circular, or any other shape. In this embodiment, the window 211 is selected as a square window 211, which is only an example and is not restrictive. A fixing rod 212 is provided in the window 211. The fixing rod 212 can be a round rod or a square rod. This embodiment also does not limit its shape.

[0069] In one embodiment, the submarine cable guiding device further includes: a guiding rope 5. One end of the guiding rope 5 is connected to the end of the submarine cable 3, and the other end is connected to the fixing rod 212.

[0070] The guiding rope 5 can be a relatively thin rope. One end is connected to the submarine cable 3, and the other end is connected to the fixing rod 212. The connection method is not specifically limited in this embodiment. The guiding rope 5 can guide the submarine cable 3. Since the traction mechanism 2 can provide driving force for the submarine cable 3, the guiding rope 5 itself does not need to provide tensile force for the submarine cable 3, as long as it can guide the submarine cable 3 to be towed back along the established direction.

[0071] The setting of the guiding rope 5 can improve the guiding effect of the device on the submarine cable 3, ensure the smooth and stable axial traction movement of the submarine cable 3 along the pipeline 1, and prevent the submarine cable 3 from shifting and misaligning. Moreover, when the rolling friction between the submarine cable 3 and the guiding member 41 is insufficient during the backhaul of the submarine cable 3, resulting in low braking efficiency, the connection between the guiding rope 5 and the conveyor belt 21 can effectively improve the braking efficiency of the submarine cable 3.

[0072] In one embodiment, each set of guiding mechanisms 4 includes three guiding members 41.

[0073] Exemplarily, as Figure 3 shown, three guiding members 41 are respectively arranged above, on the left side, and on the right side of the submarine cable 3, surrounding the outer wall of the submarine cable 3, forming an all-round protection for the submarine cable 3 to prevent the submarine cable 3 from contacting and rubbing against the inner wall of the pipeline 1.

[0074] In other embodiments, the number of guiding members 41 can also be adjusted according to the inner diameter of the pipeline 1 and the outer diameter of the submarine cable 3. For example, four, five, etc. can also be set.

[0075] In one embodiment, the guiding member 41 is a pulley.

[0076] In this embodiment, the guiding member 41 is preferably a pulley. The pulley generally consists of two parts, namely a mounting seat and a rotating wheel. The mounting seat is the fixed part of the guiding member 41, and the mounting seat is fixedly installed and connected to the inner wall of the pipeline 1. The rotating wheel is the rotating part of the guiding member 41. The rotating wheel is rotatably arranged on the mounting seat, and the surface of the rotating wheel contacts the outer wall of the submarine cable 3. When the submarine cable 3 is dragged, the rotating wheel will be driven to rotate, that is, the rolling friction between the submarine cable 3 and the guiding member 41.

[0077] In other embodiments, the guiding member 41 may also be in other forms that can perform rolling friction with the outer wall of the submarine cable 3, and no specific limitations are imposed in this embodiment.

[0078] On the other hand, this embodiment also provides a method for back-dragging construction of a submarine cable, which is applied to a submarine cable guiding device. The specific structure of the submarine cable guiding device is the same as that of the submarine cable guiding device in the above embodiment, so it will not be described in detail.

[0079] The method for back-dragging construction of a submarine cable includes the following steps:

[0080] Arrange the traction mechanism 2 and the guiding mechanism 4 in the pipeline 1;

[0081] This step is carried out on land. Specifically, the transfer cylinder 22 and the transmission belt of the traction mechanism 2 are assembled into a whole, then arranged in the installation groove on the lower side of the pipeline 1, and then the driving device and the braking device 23 are connected to the transfer cylinder 22 at the inlet end and the outlet end of the pipeline 1.

[0082] Then, set the spacing of the guiding members 41 (pulleys) according to the length of the pipeline 1, and select the size of the guiding members 41 (pulleys) based on the diameter of the submarine cable 3 and the diameter of the pipeline 1. Fix the guiding members 41 (pulleys) on the upper side, left side and right side of the pipeline 1.

[0083] Arrange the pipeline 1 in the directional hole;

[0084] During the construction of directional drilling and laying of the submarine cable 3, first, a pilot hole is drilled and then reamed to form a directional hole. Then, the pipeline 1 equipped with the traction mechanism 2 and the guiding mechanism 4 is back-dragged into the directional hole to facilitate the subsequent back-dragging work of the submarine cable 3.

[0085] Start the traction mechanism 2 to drag the submarine cable 3 from the inlet end of the pipeline 1 to the outlet end.

[0086] Remotely control the driving device to start. During the rotation of the transmission belt, gradually drive the submarine cable 3 to move from the inlet end of the pipeline 1 to the outlet end, and gradually complete the back-dragging work of the submarine cable 3.

[0087] In one embodiment, between the steps of arranging the pipeline 1 in the directional hole and starting the traction mechanism 2 to drag the submarine cable 3 from the inlet end of the pipeline 1 to the outlet end, it further includes: connecting one end of the guiding rope 5 to the end of the submarine cable 3 and the other end to the fixed rod 212.

[0088] That is, first connect one end of the guiding rope 5 to the submarine cable 3 and the other end to the fixed rod 212 in the window 211 of the conveyor belt 21, and then start the driving device to drive the submarine cable 3 for back-dragging.

[0089] While embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A submarine cable guiding device, characterized in that, Comprising: A pipeline (1), the pipeline (1) is arranged in a directional hole, one end thereof is an inlet end, and the other end is an outlet end; A traction mechanism (2), the traction mechanism (2) is arranged at the bottom of the pipeline (1), a submarine cable (3) is suitable to be arranged on the traction mechanism (2), and the traction mechanism (2) is used to drag the submarine cable (3) from the inlet end to the outlet end; Multiple groups of guiding mechanisms (4), the multiple groups of guiding mechanisms (4) are arranged at intervals along the axial direction of the pipeline (1), each group of guiding mechanisms (4) includes a plurality of guiding members (41) arranged at intervals along the circumferential direction of the pipeline (1), the guiding member (41) includes a connected fixed part and a rotating part, the fixed part is connected to the inner wall of the pipeline (1), the rotating part contacts the outer wall of the submarine cable (3), and when the submarine cable (3) moves, it drives the rotating part to rotate.

2. The submarine cable pulling guiding device according to claim 1, wherein The traction mechanism (2) includes: a conveyor belt (21), a plurality of rotating cylinders (22) and two driving devices, the plurality of rotating cylinders (22) are arranged at intervals along the axial direction of the pipeline (1), the two driving devices are respectively connected to the two rotating cylinders (22) close to the inlet end and the outlet end, and the conveyor belt (21) is wound around the rotating cylinders (22).

3. The submarine cable traction guiding device according to claim 2, characterized in that The traction mechanism (2) further includes: two braking devices (23), the two braking devices (23) are respectively connected to the two rotating cylinders (22) close to the inlet end and the outlet end.

4. The submarine cable traction guiding device according to claim 2, characterized in that, A window (211) is formed in the conveyor belt (21), and a fixing rod (212) is arranged in the window (211).

5. The submarine cable pulling guiding device according to claim 4, characterized in that, Further comprising: A guiding rope (5), one end of the guiding rope (5) is connected to the end of the submarine cable (3), and the other end is connected to the fixing rod (212).

6. The submarine cable traction guiding device according to any one of claims 1-5, characterized in that, An installation groove is formed at the bottom of the pipeline (1), and the traction mechanism (2) is arranged in the installation groove.

7. The submarine cable traction guiding device according to claim 1, characterized in that, Each group of guiding mechanisms (4) includes three guiding members (41).

8. The submarine cable traction guiding device according to claim 7, characterized in that, The guiding member (41) is a pulley.

9. A method for back-dragging submarine cable construction, applied to the submarine cable (3) guiding device according to any one of claims 1-8, characterized in that, Including the following steps: Arranging the traction mechanism (2) and the guiding mechanism (4) in the pipeline (1); Arranging the pipeline (1) in the directional hole; Starting the traction mechanism (2) to drag the submarine cable (3) from the inlet end to the outlet end of the pipeline (1).

10. The submarine cable pulling construction method according to claim 9, characterized in that, Between the step of arranging the pipeline (1) in the directional hole and the step of starting the traction mechanism (2) to drag the submarine cable (3) from the inlet end to the outlet end of the pipeline (1), it further includes: connecting one end of the guiding rope (5) to the end of the submarine cable (3), and the other end to the fixing rod (212).

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