A tandem wireline device and method for deep water fishing

Abstract

The application discloses a kind of continuation wire rope device and method for deep water salvage, it is related to offshore shipwreck salvage salvage technical field, including shipwreck, crane ship and be installed on the crane ship deck crane, crane ship deck stern is equipped with ship stern side jack, deck bow is equipped with ship bow side jack;80t anchor machine is equipped with ship stern side jack one end, the other end is equipped with wave compensator;The ship bow side jack one end is equipped with the rope container for storing ship bow side wire rope, two main hook wire ropes are equipped on the crane, the main hook wire rope is equipped with triangular plate, the main hook wire rope is completed by ship bow side wire rope and wire rope B for continuation or removal, and the lifting force can be switched when wire rope is continued by triangular plate;Ship stern side jack is used to bear the action force of shipwreck when wire rope is continued or removed;Ship bow side jack is used for temporarily fixing wire rope B in seawater when wire rope B is continued or removed on the crane of crane ship.

Description

Technical Field

[0001] This invention belongs to the field of marine shipwreck rescue and salvage technology, and in particular relates to a splicing steel wire rope device and method for deep-water salvage. Background Technology

[0002] With the rapid development of the global marine economy, maritime transport, oil and gas development, and marine engineering activities are becoming increasingly frequent, leading to a continuous increase in the number of shipwrecks and debris, especially in deep waters (such as sunken cargo, abandoned platform components, or lost large equipment). These sunken objects not only occupy marine resources or threaten shipping lane safety, but may also cause marine environmental pollution due to corrosion and leakage. Therefore, deep-water salvage technology has become one of the core research directions in the fields of marine engineering and emergency rescue.

[0003] In shipwreck rescue and salvage operations, most operations are conducted in shallow waters of 50 meters. Commonly used salvage methods, such as pontoon salvage or floating crane salvage, are generally unsuitable for deep-water salvage operations. While the double barge lifting method can be used to salvage large-tonnage shipwrecks in deep water, its lifting speed depends primarily on the retrieval speed of the jacks mounted on the barges. Currently, the jack retrieval speed is approximately 15-25 m / h, which is insufficient for deep-water salvage requirements. Furthermore, the double barge lifting method requires an additional number of jacks and steel cables, placing high demands on the preparatory work for the salvage project.

[0004] Currently, there are few methods suitable for salvaging sunken ships in deep water, and these methods are inefficient. The inability to continue steel cables during the salvage of sunken ships in deep water has always been a major problem for salvage engineers. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for splicing wire ropes for deep-water salvage, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] This invention relates to a wire rope splicing device for deep-water salvage, comprising a sunken ship, a crane vessel, and a crane installed on the deck of the crane vessel. The crane vessel has a stern-side jack at the stern and a bow-side jack at the bow. One side of each stern-side jack has an 80t anchor winch, and the other side has a wave compensator. One end of each bow-side jack has a rope holder for storing the bow-side wire rope. The crane has two main hook wire ropes, each with a triangular plate. The first angle of the triangular plate connects to the main hook wire rope, the second angle connects to the wave compensator, and the third angle connects to the sunken ship. The main hook wire ropes are spliced ​​or dismantled via the bow-side wire rope and wire rope B.

[0008] Furthermore, both the stern-side jacks and the bow-side jacks are rope-type hydraulic tension jacks.

[0009] Furthermore, a swivel ring is provided between the wave compensator and the stern-side jack.

[0010] Furthermore, the stern-side jack is connected to the 80t anchor winch and the swivel via stern-side wire ropes.

[0011] Furthermore, a guide wheel is provided between the stern-side jack and the wave compensator, which is mounted on the deck of the crane vessel.

[0012] Furthermore, the crane vessel deck is equipped with wire rope guide fixtures for splicing or disassembling wire ropes.

[0013] Furthermore, the main hook wire rope is connected to the crane via a wire rope loop.

[0014] Furthermore, the second included angle of the triangular plate is connected to the wave compensator via steel wire rope A, and the third included angle of the triangular plate is connected to the sunken ship via the sunken ship steel wire rope.

[0015] A method for splicing steel wire ropes for deep-water salvage includes the following steps:

[0016] Step 1: Determine the required number, length, and load of steel wire ropes based on the water depth at the shipwreck location and the weight of the shipwreck.

[0017] Step 2: Install the 80t anchor winch, stern jack, guide wheel, rope holder, bow jack, and wire rope guide fixture on the deck of the crane ship. The stern wire rope in the 80t anchor winch is connected to the wave compensator through the stern jack and guide wheel. The bow wire rope in the rope holder is connected to the bow jack.

[0018] Step 3: The main hook of the crane vessel is connected to the first angle of the triangle plate via the main hook wire rope, the wave compensator is connected to the second angle of the triangle plate, and the third angle of the triangle plate is connected to the sunken ship.

[0019] Step 4: After the crane vessel reaches the designated position and completes its positioning, the crane, bow jacks, and stern jacks on the crane vessel work together to connect the steel wire ropes in sections and lower them to the location of the sunken ship. After hooking the sunken ship to the third angle of the triangular plate, the crane vessel's crane first lifts the sunken ship to the height corresponding to the length of the first section of steel wire rope. Then, the stern jacks bear the weight of the sunken ship, while the bow jacks lock and bear the weight of the second section of steel wire rope in the seawater. At this time, the main hook of the crane vessel only bears the weight of the first section of steel wire rope.

[0020] Step 5: Unlatch the shackle connecting the first and second sections of the wire rope. The main hook of the crane vessel lowers the first section of the wire rope onto the deck and connects it to the second section of the wire rope. Then, the stern jacks are opened, and the connection between the bow jacks and the second section of the wire rope is released. The crane vessel continues to lift the ship. This process is repeated until the sunken ship is lifted out of the water and placed on the transport vessel, thus completing the deep-water shipwreck salvage operation.

[0021] Furthermore, the first section of wire rope is the main hook wire rope, and the second section of wire rope is wire rope B. When the water depth at the shipwreck location is 150-200m, the first section of wire rope needs to be spliced ​​or disassembled with a set of second section wire ropes. The second section of wire rope consists of two 100m wire ropes B. When the water depth at the shipwreck location is greater than 200m, a set of second section wire ropes needs to be added for every 100m increase in water depth.

[0022] The present invention has the following beneficial effects:

[0023] 1. After the crane vessel of this application reaches the location of the sunken ship and completes its positioning, the lifting force of the crane vessel's crane, stern jacks, bow jacks, and triangular plates is switched to continue connecting multiple steel wire ropes B to the deep-water sunken ship location. After hooking them up, the lifting force of the crane vessel's crane, stern jacks, bow jacks, and triangular plates is switched again to sequentially remove steel wire ropes B, lift the sunken ship out of the water in sections, and place it on the transport ship. This completes the deep-water sunken ship salvage operation.

[0024] 2. This application allows for switching of lifting force when splicing wire ropes using a triangular plate; the stern-side jack is used to withstand the sinking force when splicing or dismantling wire ropes; the bow-side jack serves to temporarily fix wire rope B in the seawater when splicing or dismantling wire rope B using the crane on the crane vessel; the wave compensator is a passive compensator that can reduce the impact of the sinking ship's up-and-down movement caused by waves on the lifting operation.

[0025] 3. This invention can be used to salvage sunken ships in deep water. Different lengths and numbers of steel wire ropes can be connected according to different water depths. At the same time, relying on this device, the lifting of the sunken ship still relies on the crane of the crane ship, which can achieve efficient salvage of sunken ships at great depths.

[0026] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a layout diagram of the crane vessel of the present invention.

[0030] Figure 3 This is a schematic diagram of the force exerted on the triangular plate when the crane of the crane vessel of the present invention lifts or lowers a sunken ship.

[0031] Figure 4 yes Figure 3 Enlarged view of part A.

[0032] Figure 5 This is a schematic diagram of the force exerted on the triangular plate when the stern-side jack of the present invention is temporarily used to fix a sunken ship.

[0033] Figure 6 yes Figure 5 Enlarged view of part B.

[0034] Figure 7 This is a schematic diagram of a sunken ship with the stern-side jack temporarily fixed at a water depth of 200 meters, according to the present invention.

[0035] Figure 8 This is a schematic diagram of the rotating ring structure of the present invention.

[0036] Figure 9 This is a schematic diagram of the wire rope guide fixture structure of the present invention.

[0037] In the diagram: 1. Crane vessel; 3. Rope holder; 4. 80t anchor winch; 5. Guide wheel; 6. Wire rope guide fixture; 7. Wreck; 8. Triangular plate; 9. Wave compensator; 10. Swivel; 21. Stern jack; 22. Bow jack; 111. Wreck wire rope; 112. Wire rope A; 113. Main hook wire rope; 114. Wire rope loop; 115. Stern wire rope; 116. Bow wire rope; 117. Wire rope B. Detailed Implementation

[0038] 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, and 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.

[0039] Please see Figure 1-9As shown, the present invention is a wire rope splicing device for deep-water salvage, including a sunken ship 7, a crane vessel 1, and a crane installed on the deck of the crane vessel 1. The stern side of the deck of the crane vessel 1 is provided with a stern-side jack 21, and the bow side of the deck is provided with a bow-side jack 22. One side of the stern-side jack 21 is provided with an 80t anchor winch 4, and the other side is provided with a wave compensator 9. One end of the bow-side jack 22 is provided with a rope holder 3 for storing the bow-side wire rope 116. The crane is provided with two main hook wire ropes 113. A triangular plate 8 is provided on the main hook wire ropes 113. The first angle of the triangular plate 8 is connected to the main hook wire rope 113, the second angle is connected to the wave compensator 9, and the third angle is connected to the sunken ship 7. The main hook wire ropes 113 are spliced ​​or dismantled through the bow-side wire ropes 116 and wire rope B 117. The triangular plate 8 allows for switching of lifting force when splicing wire ropes; the stern-side jack 21 bears the force of the sunken ship 7 during wire rope splicing or dismantling; the bow-side jack 22 temporarily fixes the wire rope B117 in the seawater when the crane on the crane vessel 1 splices or dismantles it; the wave compensator 9 is a passive compensator that reduces the impact of the sunken ship 7's up-and-down movement caused by waves on the lifting operation. This invention can be used to solve the problem of salvaging a sunken ship 7 in deep water. It can splice different lengths and numbers of wire ropes according to different water depths. At the same time, relying on this device, the lifting of the sunken ship 7 still relies on the crane on the crane vessel 1, enabling efficient salvage of the sunken ship 7 at great depths.

[0040] Both the stern-side jack 21 and the bow-side jack 22 are rope-type hydraulic tension jacks.

[0041] A swivel ring 10 is provided between the wave compensator 9 and the stern-side jack 21. For example... Figure 6 As shown, the swivel 10 is chain-shaped and can release the rotation of the wire rope.

[0042] The stern-side jack 21 is connected to the 80t anchor winch 4 and the swivel 10 via the stern-side wire rope 115.

[0043] A guide wheel 5 is installed on the deck of the crane ship 1 between the stern side jack 21 and the wave compensator 9.

[0044] The crane vessel 1 is equipped with a wire rope guide fixture 6 on its deck for splicing or disassembling wire ropes. For example... Figure 7 As shown.

[0045] The main hook wire rope 113 is connected to the crane via a wire rope loop 114. The length of the wire rope loop 114 ranges from 10 to 15 m, facilitating the routing and disassembly of the main hook wire rope 113. During construction, the length of the wire rope loop 114 affects the length of the main hook wire rope 113 connected below. When the crane lifting height is 120 m (i.e., the total length of the sunken ship wire rope 111, triangular plate 8, main hook wire rope 113, and wire rope loop 114), if the length of the wire rope loop 114 is 50 m, the maximum length of the main hook wire rope 113 is 70 m, and the maximum lifting depth of the sunken ship 7 during salvage operations is 70 m; if the length of the wire rope loop 114 is 10 m, the maximum length of the main hook wire rope 113 is 100 m, and the maximum lifting depth of the sunken ship 7 during salvage operations is 100 m. A length of 10 m for the wire rope loop 114 is the optimal length. The sum of the lengths of the main hook wire rope 113 and the wire rope loop 114 should be less than the height of the crane. When the water depth is greater than 100m, it is not possible to salvage the sunken ship 7 using a section of the main hook wire rope 113. In this case, the longer the main hook wire rope 113 is, the better (to meet the lifting height requirements and be less than the lifting height). When the water depth is less than 100m, a section of wire rope can be used to salvage the sunken ship 7. The length of the main hook wire rope 113 should meet the depth requirements for salvaging the sunken ship 7. The water depth of the sunken ship 7 is 20m (shallow water at the location of the sunken ship 7) to 100m (deep water at the location of the sunken ship 7, and the lifting height of the crane vessel 1 is about 130m).

[0046] The second included angle of the triangular plate 8 is connected to the wave compensator 9 via steel wire rope A 112, and the third included angle of the triangular plate 8 is connected to the sunken ship 7 via the sunken ship steel wire rope 111. For small fishing boats, due to their smaller size and tonnage, the sunken ship steel wire rope 111 can be a 30m folded steel wire rope; for larger sunken ships 7, a steel wire rope with a larger length and diameter is required.

[0047] The wrecked ship's steel wire rope 111 can be made by using four 30-meter folded steel wire ropes to form eight lifting points, or by using eight 15-meter steel wire ropes directly, or the number of steel wire ropes can be matched according to the number and weight of the wrecked ship's lifting points. Steel wire rope A 112 is 15-40 meters long and is used to connect with the stern side steel wire rope 115.

[0048] When the crane on the crane vessel 1 is under load to lift or lower the sunken ship 7, the steel wire rope 111 connecting the sunken ship and the steel wire rope 113 connecting the main hook of the crane vessel 1 are in the same straight line. The steel wire rope 115 on the stern side is only subjected to the wave compensator 9, the swivel 10 and its own weight. When the steel wire rope 115 on the stern side is subjected to the force of the sunken ship 7, the steel wire rope 111 connecting the sunken ship and the steel wire rope 115 connecting the stern side of the crane vessel 1 are in the same straight line. The crane on the crane vessel 1 is only subjected to the weight of the main hook steel wire rope 113 on it.

[0049] A method for splicing steel wire ropes for deep-water salvage includes the following steps:

[0050] Step 1: Determine the required number, length, and load of steel wire ropes based on the water depth at point 7 of the sunken ship and the weight of the sunken ship.

[0051] Step 2: Install the 80t anchor winch 4, stern jack 21, guide wheel 5, rope holder 3, bow jack 22, and wire rope guide fixture 6 on the deck of the crane vessel 1. The stern wire rope 115 in the 80t anchor winch 4 is connected to the wave compensator 9 through the stern jack 21 and guide wheel 5. The bow wire rope 116 in the rope holder 3 is connected to the bow jack 22.

[0052] Step 3: The main hook of the crane vessel 1 is connected to the first angle of the triangle plate 8 via the main hook wire rope 113, the wave compensator 9 is connected to the second angle of the triangle plate 8, and the third angle of the triangle plate 8 is connected to the sunken vessel 7.

[0053] Step 4: After the crane vessel 1 reaches the designated position and completes its positioning, the crane, bow jack 22, and stern jack 21 on the crane vessel 1 work together to connect the steel wire ropes in sections and lower them to the position of the sunken ship 7. After the sunken ship 7 is hooked to the third angle of the triangular plate 8, the crane of the crane vessel 1 first lifts the sunken ship 7 to the height corresponding to the length of the first section of steel wire rope. Then, the stern jack 21 bears the weight of the sunken ship 7, and the bow jack 22 locks and bears the weight of the second section of steel wire rope in the seawater. At this time, the main hook of the crane vessel 1 only bears the weight of the first section of steel wire rope.

[0054] Step 5: Unlatch the shackle connecting the first and second sections of the wire rope. After the main hook of the crane vessel 1 lowers the first section of the wire rope onto the deck and connects it to the second section of the wire rope, the stern jack 21 is opened, and the bow jack 22 is disconnected from the second section of the wire rope. The crane vessel 1 continues to lift, and so on, until the sunken ship 7 is lifted out of the water and placed on the transport ship, thus completing the deep-water salvage operation of the sunken ship 7.

[0055] The first section of wire rope is the main hook wire rope 113, and the second section of wire rope is wire rope B 117. When the water depth at the sunken ship 7 is 150-200m, the first section of wire rope needs to be spliced ​​or disassembled with a set of second section wire ropes. The second section of wire rope consists of two 100m wire ropes B 117. When the water depth at the sunken ship 7 is greater than 200m, a set of second section wire ropes needs to be added for every 100m increase in water depth.

[0056] When the water depth at point 7 of the sunken ship is 50-149m, the salvage operation of the sunken ship can be completed by using the steel wire rope 115 on the stern side, since the lifting stroke of the crane is 130m.

[0057] like Figure 5As shown, when the water depth at the sunken ship 7 is 200m, the salvage operation of the sunken ship 7 needs to be completed by coordinating the first section of steel wire rope with a set of the second section of steel wire rope. The second section of steel wire rope consists of two 100m steel wire ropes, namely B117.

[0058] When the water depth at point 7 of the sunken ship is 300m, the salvage operation of the sunken ship needs to be completed by using the first section of steel wire rope and two sets of the second section of steel wire rope. The second section of steel wire rope consists of two 100m steel wire ropes, namely Yi117.

[0059] When the water depth at point 7 of the sunken ship is 400m, the salvage operation of the sunken ship needs to be completed by using the first section of steel cable and three sets of the second section of steel cable in coordination. The second section of steel cable consists of two 100m steel cables, type B117. And so on, for every 100m increase in water depth, an additional set of the second section of steel cable is required.

[0060] The method and device for splicing steel wire ropes for deep-water salvage in this application embodiment involves the following steps: After the crane vessel 1 reaches the location of the sunken ship 7 and completes its positioning, the lifting force of the crane vessel 1 is switched with that of the stern jack 21, bow jack 22, and triangular plate 8 to splice multiple steel wire ropes B117 to the location of the sunken ship 7 in deep water. After hooking them up, the lifting force of the crane vessel 1 is switched with that of the stern jack 21, bow jack 22, and triangular plate 8 to sequentially remove the steel wire ropes B117, lift the sunken ship 7 out of the water in sections, and place it on a transport vessel. This completes the deep-water salvage operation of the sunken ship 7.

[0061] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A wire rope splicing device for deep-water salvage, comprising a sunken ship (7), a crane vessel (1), and a crane installed on the deck of the crane vessel (1), characterized in that: The crane vessel (1) is equipped with a stern-side jack (21) at the stern of the deck and a bow-side jack (22) at the bow. One side of the stern-side jack (21) is equipped with an 80t anchor winch (4), and the other side with a wave compensator (9). The stern-side wire rope (115) inside the 80t anchor winch (4) is connected to the wave compensator (9) via the stern-side jack (21) and guide wheel (5). One end of the bow-side jack (22) is equipped with a rope container (3) for storing the bow-side wire rope (116). The bow-side wire rope (116) inside the rope container (3) is connected to the bow-side jack (22). The crane is equipped with two main hook wire ropes (113). A triangular plate (8) is provided on the main hook wire rope (113). The first angle of the triangular plate (8) is connected to the main hook wire rope (113), the second angle is connected to the wave compensator (9), and the third angle is connected to the sunken ship (7). The main hook wire rope (113) is connected or dismantled through the bow side wire rope (116) and wire rope B (117). The bow side jack (22) serves to temporarily fix the wire rope B (117) in the seawater when the crane on the crane ship (1) is connected or dismantled.

2. The splicing wire rope device for deep-water salvage according to claim 1, characterized in that, Both the stern-side jack (21) and the bow-side jack (22) are rope-type hydraulic tension jacks.

3. A splicing wire rope device for deep-water salvage according to claim 1 or 2, characterized in that, A swivel ring (10) is provided between the wave compensator (9) and the stern jack (21).

4. The splicing wire rope device for deep-water salvage according to claim 3, characterized in that, The stern-side jack (21) is connected to the 80t anchor winch (4) and the swivel (10) respectively via the stern-side wire rope (115).

5. A splicing wire rope device for deep-water salvage according to claim 3, characterized in that, A guide wheel (5) is installed on the deck of the crane ship (1) between the stern side jack (21) and the wave compensator (9).

6. A splicing wire rope device for deep-water salvage according to claim 3, characterized in that, The crane vessel (1) is equipped with a wire rope guide fixture (6) on its deck for splicing or disassembling wire ropes.

7. A splicing wire rope device for deep-water salvage according to claim 3, characterized in that, The main hook wire rope (113) is connected to the crane via a wire rope loop (114).

8. A splicing wire rope device for deep-water salvage according to claim 3, characterized in that, The second included angle of the triangle plate (8) is connected to the wave compensator (9) via steel wire rope A (112), and the third included angle of the triangle plate (8) is connected to the sunken ship (7) via the sunken ship steel wire rope (111).

9. A method for splicing steel wire ropes for deep-water salvage, characterized in that, Includes the following steps: Step 1: Determine the required number, length, and load of steel wire ropes based on the water depth at the sunken ship (7) and the weight of the sunken ship (7); Step 2: Install the 80t anchor winch (4), stern jack (21), guide wheel (5), rope holder (3), bow jack (22) and wire rope guide fixture (6) on the deck of the crane ship (1). The stern wire rope (115) in the 80t anchor winch (4) is connected to the wave compensator (9) through the stern jack (21) and guide wheel (5). The bow wire rope (116) in the rope holder (3) is connected to the bow jack (22). Step 3: The main hook of the crane vessel (1) is connected to the first angle of the triangle plate (8) via the main hook wire rope (113), the wave compensator (9) is connected to the second angle of the triangle plate (8), and the third angle of the triangle plate (8) is connected to the sunken ship (7). Step 4: After the crane vessel (1) reaches the designated position and completes its positioning, the crane, bow jack (22), and stern jack (21) on the crane vessel (1) work together to connect the steel wire ropes in sections and lower them to the position of the sunken ship (7). After the sunken ship (7) is hooked to the third angle of the triangular plate (8), the crane of the crane vessel (1) first lifts the sunken ship (7) to the height corresponding to the length of the first section of steel wire rope. Then, the stern jack (21) bears the weight of the sunken ship (7), and the bow jack (22) locks and bears the weight of the second section of steel wire rope in the seawater. At this time, the main hook of the crane vessel (1) only bears the weight of the first section of steel wire rope. Step 5: Unhook the shackle connecting the first section of the steel wire rope and the second section of the steel wire rope. After the main hook of the crane vessel (1) lowers the first section of the steel wire rope onto the deck and connects it to the second section of the steel wire rope, the stern jack (21) is opened and the bow jack (22) is disconnected from the second section of the steel wire rope. The crane vessel (1) continues to lift. In this way, the sunken ship (7) is lifted out of the water and placed on the transport ship, thus completing the deep-water sunken ship (7) salvage operation.

10. A method for splicing steel wire ropes for deep-water salvage according to claim 9, characterized in that, The first section of wire rope is the main hook wire rope (113), and the second section of wire rope is wire rope B (117). When the water depth at the sunken ship (7) is 150-200m, the first section of wire rope needs to be connected to or disassembled with a set of second section wire ropes. The second section of wire rope consists of two 100m wire ropes B (117). When the water depth at the sunken ship (7) is greater than 200m, a set of second section wire ropes needs to be added for every 100m increase in water depth.

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