Method and apparatus for cleaning a submarine cable platform jacket

Abstract

The application discloses a kind of submarine cable platform pipe cleaning methods, which includes the following steps: S1, land preloading pipe;S2, respectively adjust the position of cable-laying ship and pipe;S3, ROV or diver observes at the bottom of pipe, prepares signal cable transmission;S4, signal cable at the top of pipe is connected with platform winch, signal cable at the bottom of pipe is connected with cable-laying ship crane hook head and is recycled to the deck of cable-laying ship;S5, continue to recycle signal cable to platform winch cable joint head by recycling cable-laying ship winch on the deck of cable-laying ship and reach the deck of cable-laying ship and do temporary fixing;S6, pig installation is carried out on the deck of cable-laying ship;S7, cable-laying ship winch and platform winch are respectively recycled by releasing and recovering operation, so that pig repeatedly walks in pipe and carries out pigging;S8, recycle pig to platform, and a kind of submarine cable platform pipe cleaning device is also disclosed.The submarine cable platform pipe cleaning method and device provided by the application improve the efficiency and quality of pigging operation.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering technology, and in particular relates to a method and apparatus for cleaning the protective pipes of submarine cable platforms. Background Technology

[0002] With the continuous development of the offshore oil and gas industry, offshore oil and gas extraction, production, and processing systems are becoming increasingly sophisticated and numerous. The market share of submarine cable construction, a key component of offshore facility operation and power transmission, is growing daily. A crucial operational step in submarine cable laying is the cable haul-out operation. This involves connecting the cable tow head via a platform winch and pulling the cable through a pre-installed protective casing to its designed position on the platform. The protective casing serves to protect the cable during its service life. Most of these casings are pre-installed on land onto the jacket foundation and then installed offshore along with the foundation.

[0003] Due to the nature of marine engineering construction procedures, the interval between the installation of the protective pipe and the cable pulling operation is often long. During this period, there will be a lot of marine organisms inside the protective pipe, and tools or metal parts that fall into the protective pipe during platform pre-commissioning operations can cause obstruction of the cable pulling channel onto the platform, which can easily lead to jamming. If the inside of the protective pipe is not cleaned in time, it will cause the cable to bend or be damaged during installation, increasing the difficulty of construction.

[0004] Therefore, there is an urgent need to design a method and device for cleaning submarine cable platform protective pipes to solve the problem mentioned above, which causes the internal channels of the protective pipes to become stuck, preventing timely cleaning of the inside of the protective pipes, resulting in submarine cables being bent or damaged, and increasing the difficulty of construction. Summary of the Invention

[0005] To address the technical problem mentioned in the background art, where the internal channels of the cable conduit become blocked, preventing timely cleaning of the conduit and causing the submarine cable to bend or be damaged, thus increasing the difficulty of construction, a method and device for cleaning the cable conduit of a submarine cable platform is provided to solve the above-mentioned problems.

[0006] To achieve the above objectives, the specific technical solution of the submarine cable platform protective pipe cleaning method and device of the present invention is as follows: A method for cleaning the protective pipe of a submarine cable platform includes the following steps: S1. Pre-installed protective pipe on land, with signal cables pre-installed and fixed inside the protective pipe; S2. Adjust the positions of the cable-laying vessel and the protective pipe respectively, so that the position of the entry bridge on the cable-laying vessel is directly aligned with the bottom of the protective pipe. S3, ROV or divers observe from the bottom of the casing and prepare to transmit signal cables; S4. The signal cable at the top of the liner is connected to the platform winch, and the signal cable at the bottom of the liner is connected to the hook of the cable-laying vessel crane and retrieved to the deck of the cable-laying vessel. S5. Connect the ship's winch cable to the signal cable on the deck of the cable-laying vessel. Continue to retrieve the signal cable by retrieving the winch of the cable-laying vessel until the platform winch cable joint reaches the deck of the cable-laying vessel and is temporarily secured. S6. Install the pipe cleaning ball on the deck of the cable-laying vessel. The platform winch retrieves the steel cable, and the cable-laying vessel winch releases the steel cable at the same rate. The pipe cleaning ball is dragged into the conduit for cleaning. The ROV or diver observes the state of debris in the conduit. S7. The cable-laying vessel winch and the platform winch, through release and retrieval operations respectively, allow the pipe-cleaning sphere to repeatedly travel within the pipe to clean the pipe until the ROV or the diver observes that no debris has been removed. S8. Retrieve the pigging ball to the platform, disconnect the pigging ball rigging, and complete the pigging operation.

[0007] Furthermore, before adjusting the positions of the cable-laying vessel and the protective pipe, the deck personnel of the cable-laying vessel fix the beacon to the support, and the ROV or diver operator carries the support into the water to lower the beacon outside the route area as a positioning reference for the cable-laying vessel.

[0008] A cable platform liner cleaning device includes a cable-laying vessel and a platform. A liner is installed on the platform, and a signal cable is installed inside the liner. The cable-laying vessel is equipped with a cable-laying vessel winch, and the platform is equipped with a platform winch. One end of the cable-laying vessel winch cable is connected to the signal cable, and the other end of the platform winch cable is connected to the signal cable. The device also includes a cleaning sphere, which is positioned between the platform winch cable and the signal cable. The cable is released or retrieved by the cable-laying vessel winch, and the platform winch retrieves or releases the cable at the same rate, so that the cleaning sphere can clean the liner.

[0009] Furthermore, it also includes a conduit frame, with a platform set on top of the conduit frame, a protective tube set along the length of the conduit frame, and a signal cable running through the protective tube.

[0010] Furthermore, it also includes a crane, which is set up on the cable-laying vessel. The crane is connected to the end of the signal cable away from the platform winch. The crane lifts the signal cable to the winch of the cable-laying vessel so that the end of the signal cable away from the platform winch is connected to the steel cable of the winch of the cable-laying vessel.

[0011] Furthermore, the pigging jack includes a pipe body with a wire brush installed on it. One end of the pipe body has a first lifting lug, and the other end has a second lifting lug. The first lifting lug is connected to a signal cable, and the second lifting lug is connected to a platform winch cable.

[0012] Furthermore, the wire brush includes a first wire brush and a second wire brush, which are spaced apart and sleeved on the pipe body. The first wire brush and the second wire brush are fixedly connected to the pipe body through a flange.

[0013] Furthermore, the first wire brush is clamped between two flanges and fixed to the pipe body through the two flanges, and the second wire brush is clamped between two other flanges and fixed to the pipe body through the two flanges.

[0014] Furthermore, it also includes a universal swivel joint, which is installed between the platform winch's steel cable and the pigging ball.

[0015] Furthermore, the bottom of the protective tube is flared.

[0016] The method and apparatus for cleaning the cable platform protective pipe of the present invention have the following advantages: The pigging sphere is positioned between the platform winch cable and the signal cable. The cable is released or retrieved by the winch of the cable-laying vessel, and the platform winch retrieves or releases the cable at the same rate. This allows the pigging sphere to clean the protective casing, effectively removing marine organisms and other debris inside the casing. This ensures that when the submarine cable is subsequently installed inside the casing, there will be no blockage or jamming when the cable is pulled out, preventing the cable from bending or being damaged. This ensures construction quality and improves the efficiency and quality of the pigging operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the pre-embedded signal cable in the conduit of the present invention; Figure 2 for Figure 1 A magnified structural diagram of A in the middle; Figure 3 for Figure 1 A magnified structural diagram of B in the diagram; Figure 4 This is a top view of the pre-embedded signal cable in the conduit of the present invention; Figure 5 This is a schematic diagram of the connection between the steel cable and signal cable of the winch on the cable-laying vessel of the present invention. Figure 6 This is a schematic diagram of the crane hoisting signal cable of the present invention. Figure 1 ; Figure 7 for Figure 6 A magnified structural diagram of C; Figure 8 This is a schematic diagram of the crane hoisting signal cable of the present invention. Figure 2 ; Figure 9 This is a schematic diagram of the structure of the present invention for recovering the signal cable to the deck of the cable-laying vessel and connecting it to the winch of the cable-laying vessel; Figure 10 This is a schematic diagram of the winch on the cable-laying vessel of the present invention continuously retrieving the signal cable; Figure 11 for Figure 10 A magnified structural diagram of D in the diagram; Figure 12 A schematic diagram of the structure of the pigging ball connection of the present invention; Figure 13 This is a schematic diagram of the structure of the cleaning and protective pipe cleaning tube of the present invention; Figure 14 This is a schematic diagram of the structure of the pigging ball of the present invention; Figure 15 This is a side view of the pigging ball of the present invention.

[0018] Explanation of markings in the diagram: 1. Cable-laying vessel; 11. Cable-laying vessel winch; 12. Crane; 121. Recovering rigging; 13. Cable-laying vessel winch cable; 14. Water inlet bridge; 15. Cable-laying vessel winch cable joint; 2. Jacket; 3. Platform; 31. Platform winch; 32. Platform winch cable; 33. Platform winch cable joint; 4. Pipeline protection; 41. Bell mouth; 5. Signal cable; 6. Pipeline pig; 61. Pipeline body; 611. First lifting lug; 612. Second lifting lug; 62. First wire brush; 63. Second wire brush; 64. Flange; 7. Universal joint; 8. ROV or diver; 9. Locking buckle. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0021] The following is a reference to the appendix. Figure 1 To be continued Figure 14 The present invention describes a method and apparatus for cleaning the protective pipes of a submarine cable platform.

[0022] like Figure 1 As shown, the method for cleaning the cable platform conduit in this invention includes the following steps: Due to the nature of marine engineering construction procedures, the interval between the installation of the protective pipe 4 and the cable pulling operation is often quite long. During this period, the inside of the protective pipe 4 may contain a large amount of marine life, and tools or metal parts that may fall into the protective pipe 4 during the pre-commissioning work of the platform 3 can obstruct the cable's path onto the protective pipe 4, easily causing jamming. If the inside of the protective pipe 4 is not cleaned in time, it can cause the cable to bend excessively or be damaged during installation, increasing the difficulty of construction. Therefore, before installing the cable, the inside of the protective pipe 4 needs to be cleaned to remove impurities, ensuring that the cable is installed smoothly without jamming. Therefore, there is an urgent need to design a method and device for cleaning the cable platform protective pipe to solve the above-mentioned problems.

[0023] like Figures 1 to 14 As shown, the present invention provides a method for cleaning the protective pipe of a submarine cable platform, comprising the following steps: S1. Pre-installed protective pipe 4 on land, with signal cable 5 pre-installed and fixed inside the protective pipe 4; S2. Adjust the positions of the cable-laying vessel 1 and the protective pipe 4 respectively, so that the position of the water inlet bridge 14 on the cable-laying vessel 1 is directly opposite the bottom of the protective pipe 4. S3, ROV or diver 8 observe from the bottom of the protective tube 4 and prepare to transmit the signal cable 5; S4, the signal cable 5 at the top of the protective pipe 4 is connected to the platform winch 31, and the signal cable 5 at the bottom of the protective pipe 4 is connected to the hook of the cable-laying vessel crane 12 and retrieved to the deck of the cable-laying vessel 1. S5. On the deck of the cable-laying vessel 1, the cable-laying vessel winch 11 is connected to the signal cable 5. The signal cable 5 is retrieved by retrieving the cable-laying vessel winch 11 until the platform winch cable joint 33 reaches the deck of the cable-laying vessel 1 and is temporarily secured. S6. Install the pipe cleaning ball 6 on the deck of the cable-laying vessel 1. The platform winch 31 retrieves the steel cable, and the cable-laying vessel winch 11 releases the steel cable at the same rate. The pipe cleaning ball 6 is dragged into the protective pipe 4 for cleaning. The ROV or diver 8 observes the state of debris in the protective pipe 4. S7, the cable-laying vessel winch 11 and the platform winch 31 respectively release and retrieve the pipe cleaning ball 6 to repeatedly travel inside the protective pipe 4 to clean the pipe until the ROV or the diver 8 observes that no debris has been removed. S8. Retrieve the pigging ball 6 to platform 3, untie the rigging connection of the pigging ball 6, and complete the pigging operation.

[0024] The pigging sphere 6 is positioned between the platform winch 31 and the signal cable 5. The steel cable is released or retrieved by the winch 11 of the cable-laying vessel, and the platform winch 31 retrieves or releases the steel cable at the same rate. This allows the pigging sphere 6 to clean the protective pipe 4, effectively removing marine organisms and other debris inside the protective pipe 4. This ensures that when the submarine cable is subsequently installed inside the protective pipe 4, there will be no blockage or jamming when the cable is pulled out of the protective pipe 4, avoiding bending and damage to the cable, ensuring construction quality, and improving the efficiency and quality of the pigging operation.

[0025] Furthermore, such as Figures 1 to 12 As shown, before adjusting the positions of the cable-laying vessel 1 and the protective pipe 4, the deck personnel of the cable-laying vessel 1 fix the beacon on the support. The ROV or diver 8 operator carries the support into the water and lowers the beacon outside the route area as a positioning reference for the cable-laying vessel 1. After the cable-laying vessel 1 is positioned, the subsequent cleaning operation of the protective pipe 4 is carried out.

[0026] like Figures 1 to 12 As shown, the present invention also provides a cable platform conduit cleaning device, including a cable-laying vessel 1 and a platform 3. A conduit 4 is installed on the platform 3, and a signal cable 5 is installed inside the conduit 4. A cable-laying vessel winch 11 is installed on the cable-laying vessel 1, and a platform winch 31 is installed on the platform 3. One end of the cable-laying vessel winch cable 13 is connected to one end of the signal cable 5, and the other end of the platform winch cable 32 is connected to the other end of the signal cable 5. The device also includes a cleaning ball 6, which is positioned between the platform winch 31 and the signal cable 5. The cable is released or retrieved by the cable-laying vessel winch 11, and the platform winch 31 retrieves or releases the cable at the same rate, allowing the cleaning ball 6 to clean the conduit 4. In this embodiment, to facilitate the cleaning ball 6 entering the conduit 4 for cleaning, the bottom of the conduit 4 is shaped like a trumpet 41.

[0027] Furthermore, such as Figures 1 to 12 As shown, the submarine cable platform protective pipe cleaning device provided by the present invention also includes a guide frame 2, a platform 3 is set on top of the guide frame 2, a protective pipe 4 is set along the length direction of the guide frame 2, and a signal cable 5 is inserted into the protective pipe 4. In the stage of pre-installing the protective pipe 4 on land, the signal cable 5 is first inserted into the protective pipe 4 to facilitate the subsequent connection of the cleaning ball 6 to clean the inside of the protective pipe 4.

[0028] Furthermore, such as Figures 1 to 12 As shown, the cable platform casing cleaning device provided by the present invention also includes a crane 12, which is installed on the cable-laying vessel 1. The crane 12 is connected to the end of the signal cable 5 away from the platform winch 31. The crane 12 lifts the signal cable 5 to the winch 11 of the cable-laying vessel, so that the end of the signal cable 5 away from the platform winch 31 is connected to the winch cable 13 of the cable-laying vessel. Thus, both ends of the signal cable 5 are connected to the platform winch cable 32 and the winch cable 13 of the cable-laying vessel, respectively. The winch 11 of the cable-laying vessel releases or retrieves the cable, and the platform winch 31 retrieves or releases the cable at the same rate, so that the cleaning ball 6 can clean the casing 4, effectively cleaning marine organisms and other debris inside the casing 4. This ensures that when the submarine cable is subsequently installed inside the casing 4, there is no blockage or jamming when the submarine cable is pulled out inside the casing 4, avoiding bending and damage to the submarine cable, ensuring construction quality, and improving the efficiency and quality of the cleaning operation. In this embodiment, the cable 13 of the cable-laying vessel winch and the signal cable 5 are connected by the cable-laying vessel winch cable joint 15.

[0029] Furthermore, such as Figure 13 and Figure 14 As shown, the pigging ball 6 includes a pipe body 61 with a wire brush. One end of the pipe body 61 has a first lifting lug 611, and the other end has a second lifting lug 612. The first lifting lug 611 is connected to the signal cable 5, and the second lifting lug 612 is connected to the platform winch cable 32. The pigging ball 6 is connected between the platform winch cable 32 and the signal cable 5. The cable is released or retrieved by the cable-laying vessel winch 11, and the platform winch 31 retrieves or releases the cable at the same rate, so that the pigging ball 6 can clean the protective pipe 4 until the ROV or the diver 8 observes that no debris has been removed from the bottom of the protective pipe 4. If there are still impurities at the bottom of the protective pipe 4, the cable-laying vessel winch cable 13 and the platform winch cable 32 are pulled back and forth, so that the pigging ball 6 moves back and forth inside the protective pipe 4 to clean the protective pipe 4.

[0030] Furthermore, such as Figure 13 and Figure 14 As shown, the wire brush includes a first wire brush 62 and a second wire brush 63. The first wire brush 62 and the second wire brush 63 are spaced apart and sleeved on the pipe body 61. The first wire brush 62 and the second wire brush 63 are fixedly connected to the pipe body 61 through flanges 64. The first wire brush 62 is clamped between two flanges 64 and fixed to the pipe body 61 by the two flanges 64. The second wire brush 63 is clamped between two other flanges 64 and fixed to the pipe body 61 by the two flanges 64. In other embodiments, multiple wire brushes can be provided on the pipe body 61 to enhance the cleaning and protection of the pipe 4.

[0031] Two pairs of flanges 64 are welded to both ends of the pipe fitting. The two flanges 64 at each end clamp the wire brush with bolts. When the wire brush in the middle of the flanges 64 reaches the end of its service life, the flanges 64 can be disassembled to install a new wire brush for replacement. The operation is simple and allows for reuse. Moreover, the flanges 64 and wire brushes of different sizes can be matched in terms of size, making the modification difficult and highly scalable.

[0032] Furthermore, such as Figure 11 As shown, the cable platform pipe cleaning device provided by the present invention also includes a universal joint 7, which is installed between the platform winch cable 32 and the pipe cleaning ball 6. By installing the universal joint 7, a 360° transmission angle without dead angles can be achieved, preventing the wire rope from twisting. The universal joint 7 and the platform winch cable 32 are connected by a fastener 9.

[0033] The cleaning process of the submarine cable platform conduit cleaning device provided by this invention is as follows: In the second stage of land-based construction of the jacket, signal cable 5 is laid in advance inside the pre-installed protective pipe 4. The signal cable 5 passes through the protective pipe 4 and is fixed with rigging at the upper and lower parts respectively. The cable-laying vessel 1 is moved closer to the platform 3. The position of the vessel is adjusted so that the water inlet bridge 14 on the cable-laying vessel 1 faces the funnel opening 41 of the protective pipe 4. Attention is paid to the safe distance between the cable-laying vessel 1 and the platform 3, and the angle between the orientation of the water inlet bridge 14 and the orientation of the funnel opening 41 at the bottom of the protective pipe 4 is minimized. After adjusting the ship's position, the deck crew of cable-laying vessel 1 will fix the beacon to the support and hand it over to the ROV or diver 8 operators. The ROV or diver 8 will carry the support into the water and lower the beacon outside the route area as a positioning reference for cable-laying vessel 1. Platform operators connect platform winch cable 32 to signal cable 5 according to the design rigging requirements; The ROV or diver 8 moves to the funnel opening 41 of the protective pipe 4 for observation, preparing to retrieve the signal cable 5. The hook of the crane 12 on the cable-laying vessel 1 is connected to the retrieval rigging of the signal cable 5. The boom and angle of the crane 12 are adjusted according to the positioning guide, and the steel cable of the crane 12 is released into the water to the vicinity of the opening of the protective pipe 4. The ROV or diver 8 unties the signal cable 5 at the bottom of the protective pipe 4 and connects the signal cable 5 to the retrieval rigging 121 on the hook of the crane 12. The crane 12's wire rope is retrieved, gradually bringing the signal cable 5 to the surface. During the retrieval process, the ROV or diver 8 observes the status of the rigging at the bottom of the duct 4's bell-shaped opening 41 to check for any obstructions. If the duct 4 is blocked, causing the signal cable 5 to be obstructed during retrieval, the ROV or diver 8 can use a long hook to clear the obstruction at the bell-shaped opening 41. At the same time, the platform winch 31 repeats the "retrieve and quickly lower" steps. The crane 12 pulls the signal cable 5 across the water inlet bridge 14, lays it flat on the deck of the cable-laying vessel 1, and secures it. Then, the crane 12 is disconnected and reset. On the deck of cable-laying vessel 1, the end of signal cable 5 is connected to the cable-laying vessel winch 11, and the signal cable 5 is continued to be retrieved until the platform winch cable joint 33 reaches the deck of cable-laying vessel 1 and is fixed. The deck crew unties the signal cable 5 and connects it to the platform winch cable joint 33. According to the design rigging requirements, the pigging ball 6 is connected between the platform winch cable 32 and the signal cable 5; the temporary fixation is released, the cable-laying vessel winch 11 is lowered, and the platform winch 31 is retrieved at the same speed. The ROV or diver 8 observes the status of the signal cable 5 at the funnel 41, and the deck personnel record the length of the cable-laying vessel winch 11 lowered. When the pigging ball 6 reaches the funnel 41, the lowering is stopped. When the cleaning sphere 6 is about to reach the funnel opening 41, adjust the length of the lowering and retrieval of the cable-laying vessel winch 11 so that the cleaning sphere 6 enters the protective pipe 4 directly facing the funnel opening 41. When the cleaning sphere 6 enters the funnel opening 41 of the protective pipe 4, the personnel on platform 3 begin to record the retrieval length of the platform winch 31 until the cleaning sphere 6 leaves the protective pipe 4, thereby verifying the actual length of the protective pipe 4. The platform winch 31 continues to retrieve until the cleaning sphere 6 is retrieved back to platform 3. If the ROV or diver 8 observes that there is still debris being cleared from the funnel opening 41, the above-mentioned winch pulling operation at both ends can be repeated to perform repeated cleaning until no debris is cleared. The platform 3 personnel removed the pipe cleaning ball 6 and connected the platform winch cable 32 to the cable-laying vessel winch cable 13; the platform winch cable 32 was lowered, and the cable-laying vessel winch cable 13 was retrieved simultaneously. The platform winch cable 32 was retrieved to the deck of the cable-laying vessel 1, temporarily fixed, and released from tow by the cable-laying vessel winch 11. Finally, the head end of the submarine cable was connected, with one end of the submarine cable connected to the cable-laying vessel winch cable 13 and the other end connected to the platform winch cable 32, in preparation for pulling the submarine cable out of the protective pipe 4.

[0034] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for cleaning the protective pipe of a submarine cable platform, characterized in that, Includes the following steps: S1. Pre-installed protective pipe on land, with signal cables pre-installed and fixed inside the protective pipe; S2. Adjust the positions of the cable-laying vessel and the protective pipe respectively, so that the position of the entry bridge on the cable-laying vessel is directly aligned with the bottom of the protective pipe. S3, ROV or divers observe from the bottom of the casing and prepare to transmit signal cables; S4. The signal cable at the top of the liner is connected to the platform winch, and the signal cable at the bottom of the liner is connected to the hook of the cable-laying vessel crane and retrieved to the deck of the cable-laying vessel. S5. Connect the ship's winch cable to the signal cable on the deck of the cable-laying vessel. Continue to retrieve the signal cable by retrieving the winch of the cable-laying vessel until the platform winch cable joint reaches the deck of the cable-laying vessel and is temporarily secured. S6. Install the pipe cleaning ball on the deck of the cable-laying vessel. The platform winch retrieves the steel cable, and the cable-laying vessel winch releases the steel cable at the same rate. The pipe cleaning ball is dragged into the conduit for cleaning. The ROV or diver observes the state of debris in the conduit. S7. The cable-laying vessel winch and the platform winch, through release and retrieval operations respectively, allow the pipe-cleaning sphere to repeatedly travel within the pipe to clean the pipe until the ROV or the diver observes that no debris has been removed. S8. Retrieve the pigging ball to the platform, disconnect the pigging ball rigging, and complete the pigging operation.

2. The method for cleaning the protective pipe of a submarine cable platform according to claim 1, characterized in that, Before adjusting the position of the cable-laying vessel and the protective pipe, the deck personnel of the cable-laying vessel fix the beacon to the support. The ROV or diver operator carries the support into the water and lowers the beacon outside the route area as a positioning reference for the cable-laying vessel.

3. A cable platform conduit cleaning device, comprising the cable platform conduit cleaning method as described in any one of claims 1-2, characterized in that, The system includes a cable-laying vessel and a platform. A protective pipe is installed on the platform, and a signal cable is installed inside the protective pipe. The cable-laying vessel is equipped with a cable-laying vessel winch, and the platform is equipped with a platform winch. One end of the cable-laying vessel winch cable is connected to the signal cable, and the other end of the platform winch cable is connected to the signal cable. The system also includes a cleaning sphere, which is placed between the platform winch cable and the signal cable. The cable is released or retrieved by the cable-laying vessel winch, and the platform winch retrieves or releases the cable at the same rate, so that the cleaning sphere can clean the protective pipe. The pigging gantry includes a pipe body with wire brushes installed on it. A first lifting lug is located at one end of the pipe body, and a second lifting lug is located at the other end. The first lifting lug is connected to a signal cable, and the second lifting lug is connected to a platform winch cable. The wire brushes include a first wire brush and a second wire brush, which are spaced apart and fitted onto the pipe body. The first and second wire brushes are fixedly connected to the pipe body via flanges. The first wire brush is clamped between two flanges and fixed to the pipe body via the two flanges. The second wire brush is clamped between two other flanges and fixed to the pipe body via the two flanges.

4. The cable platform conduit cleaning device according to claim 3, characterized in that, It also includes a conduit frame, with a platform set on top of the conduit frame, a protective tube set along the length of the conduit frame, and a signal cable run through the protective tube.

5. The cable platform conduit cleaning device according to claim 3, characterized in that, It also includes a crane, which is set up on the cable-laying vessel. The crane is connected to the end of the signal cable away from the platform winch. The crane lifts the signal cable to the winch of the cable-laying vessel so that the end of the signal cable away from the platform winch is connected to the steel cable of the winch of the cable-laying vessel.

6. The cable platform conduit cleaning device according to claim 3, characterized in that, It also includes a universal swivel joint, which is installed between the platform winch's steel cable and the pigging ball.

7. The cable platform conduit cleaning device according to claim 3, characterized in that, The bottom of the protective tube is flared.

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