Large pontoon binding steel wire pre-tightening method based on linear winch

Abstract

This invention discloses a method for pre-tightening the binding wire rope of a large pontoon based on a linear winch, belonging to the field of rescue and salvage. Large pontoons on both sides of the distressed vessel have through holes, with a linear winch and bollards on the same side. A thin traction wire rope (A) is threaded through the through hole. The pontoon is then connected to the mother vessel, and the thin traction wire ropes A and B are connected. The thin traction wire rope B is pre-connected to the bottom-crossing thick wire rope. A crane inserts the bottom-crossing thick wire rope into a movable clamp. The large pontoons are symmetrically arranged. The linear winch is activated, and the two movable clamps pre-tighten the bottom-crossing thick wire rope. The large pontoons are brought close to the distressed vessel. If the bottom-crossing thick wire rope becomes slack, it is tightened. This invention utilizes a linear winch to actively and continuously tighten the bottom-crossing thick wire rope, ensuring that the bottom-crossing thick wire rope reaches the ideal pre-tightening state, allowing the large pontoons to be firmly attached to the distressed vessel, fundamentally solving the risk of displacement or detachment of the large pontoons due to insecure binding.

Description

Technical Field

[0001] This invention relates to a method for pre-tightening the steel wire rope binding of a large pontoon based on a linear winch, belonging to the field of rescue and salvage. Background Technology

[0002] In conventional buoy-assisted salvage operations, the buoy and the distressed vessel are typically secured with steel wire ropes. Generally, a bottom-passing steel wire rope is first threaded through the distressed vessel, then passed through a guide hole inside the buoy. The end of the bottom-passing steel wire rope is then hooked to the top pile of the buoy, and so on, depending on the length of the wire rope, to ensure the rope is tightened and the buoy and vessel are securely secured. However, considering the need for fixed pile positions and the difficulty of securing the bottom-passing steel wire rope, this method often fails to tighten effectively, resulting in an inadequate and unsecured connection between the buoy and the vessel. Therefore, designing a pre-tightening method for the steel wire ropes used to secure large buoys based on a linear winch is essential. Summary of the Invention

[0003] To address the shortcomings of the prior art, this invention provides a method for pre-tightening the steel wire rope binding of a large pontoon based on a linear winch. The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A method for pre-tensioning the binding wire rope of a large floating box based on a linear winch includes the following steps: Step 1: Several large pontoons are symmetrically arranged on both sides of the wrecked vessel. Each large pontoon has several evenly distributed through holes. On the same side of the through holes, there are several linear winches and several bollards. Step 2: Thread each traction thin steel wire rope A into the through hole of the large pontoon box. After passing through the through hole of the large pontoon box, fix the traction thin steel wire rope A to the cable pile on the top of the large pontoon box. Step 3: After the large pontoon and the working mother ship are in place with the cables, the crane of the working mother ship will connect the traction thin steel wire rope A of the large pontoon to the traction thin steel wire rope B on the side of the stricken ship in sequence. The traction thin steel wire rope B has been connected in advance to the bottom thick steel wire rope set at the bottom of the stricken ship. Step 4: The crane on the working mother ship lifts the connected traction thin steel wire rope A and traction thin steel wire rope B and introduces them into the idler rollers and two movable clamps of the linear winch, so that the bottom thick steel wire rope is passed into the movable clamps on the corresponding linear winch. Step 5: Large pontoons are symmetrically arranged on both sides of the distressed vessel. One end of each thick steel wire rope passing the bottom eventually enters the movable clamp of the linear winch, and the other end is led out by the traction thin steel wire rope A on the symmetrical side of the distressed vessel and anchored at the corresponding mooring bollard. Step 6: Start the linear winch. The two movable grippers on the linear winch work back and forth to pre-tighten each of the bottom thick steel wire ropes. Step 7: The large pontoons begin to gradually move closer to the distressed vessel. The position of the large pontoons is adjusted by the large pontoon cables until the large pontoons on both sides are completely close to the distressed vessel. Step 8: If the bottom-crossing steel wire rope becomes slack during the undulation of the large pontoon, the bottom-crossing steel wire rope will be further tightened by a linear winch to ensure that the large pontoon is firmly attached to the wrecked vessel.

[0004] Furthermore, each large pontoon has four through holes, and two linear winches and two bollards are installed on the same side of the through holes, with the bollards and linear winches being arranged alternately.

[0005] Furthermore, the axes of the two linear winches and two bollards, which are alternately distributed on each large pontoon, are on the same vertical line as the center of the four through holes.

[0006] Furthermore, the number of large buoys on one side of the distressed vessel is set as needed according to the specifications of the distressed vessel.

[0007] Furthermore, in step 4, both movable grippers of the linear winch are wedge-shaped self-locking structures.

[0008] Furthermore, when tightening the thick steel wire rope over the bottom, the movable clamps on the side closer to the distressed vessel open, while the movable clamps on the side farther from the distressed vessel lock and move forward. Then, the movable clamps on the side farther from the distressed vessel open, while the movable clamps on the side closer to the distressed vessel lock and move forward, and this process is repeated continuously, so that the large pontoon gradually moves closer to the distressed vessel.

[0009] Furthermore, the large buoy is controlled by the connecting cable between the large buoy and the working mother ship as it approaches the distressed vessel.

[0010] Furthermore, in step 7, after the large pontoon is fully against the distressed vessel, the two movable clamps of the linear winch simultaneously lock to brake the vessel.

[0011] Furthermore, the linear winch base frame is welded and fixed to the top of the large pontoon by L-shaped steel plates.

[0012] The beneficial effects of this invention are: This invention utilizes a linear winch to actively and continuously tighten the bottom-crossing thick steel wire rope, which can ensure that the bottom-crossing thick steel wire rope reaches the ideal pre-tightening state, so that the large pontoon is firmly attached to the difficult vessel, fundamentally solving the risk of displacement or detachment of the large pontoon due to insecure binding. The pre-tightening method of the buoy binding wire rope based on the linear winch can start the linear winch at any time to re-tighten the bottom thick wire rope, maintain continuous pre-tightening force, avoid the slack of the bottom thick wire rope due to changes in the hull attitude during difficult ship undulation operations, ensure the structural stability and safety of the entire operation cycle, reduce safety accidents or project delays caused by binding failure, and reduce potential salvage failure risks and subsequent disposal costs. This method uses a linear winch for tightening, replacing the traditional method of tightening by manual labor or simple tools, which greatly reduces labor intensity, shortens tightening time, and speeds up the overall construction progress. It is suitable for urgent, difficult and dangerous marine salvage operations. The linear winch is pre-fixed to the top of the large pontoon, and its axis is aligned with the through hole of the large pontoon to ensure the smooth passage of the wire rope. The hydraulic and control systems are centrally located on the deck of the mother ship, realizing the modularization of equipment and rational layout, reducing on-site adjustment time. By symmetrically arranging linear winches and ensuring that each symmetrical through-hole path has a corresponding linear winch, multiple bottom-passing thick steel wire ropes can be tightened synchronously or as needed, ensuring balanced force on large floating boxes; moreover, the linear winches have a large rated tensile force and are equipped with two movable clamps that work back and forth to tighten, which can achieve stable and controllable pre-tensioning force application, avoiding equipment or structural damage caused by uneven or sudden force, and improving the reliability of the overall binding system. This method has been studied and verified in conjunction with large pontoons and matching linear winches. It is applicable to large pontoon-assisted buoyancy salvage projects and can be adjusted according to different pontoon sizes and through-hole layouts, making it highly applicable for widespread promotion. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of a single large floating box of the present invention.

[0016] Figure 3 This is a schematic diagram of the placement of the large pontoon and the difficult vessel according to the present invention.

[0017] Figure 4 for Figure 3 A magnified view of part A in the middle.

[0018] Figure 5 for Figure 3 A magnified view of part B in the middle section.

[0019] Figure 6 This is a partial schematic diagram of the traction thin steel wire ropes A and B of the present invention when they are not connected.

[0020] In the diagram, 1. Linear winch; 2. Large pontoon; 3. Difficult vessel; 4. Movable clamp; 5. Idler roller; 6. Through hole; 7. Bollard; 8. Bottom-crossing thick steel wire rope; 9. Traction thin steel wire rope A; 10. Traction thin steel wire rope B; 11. Working mother vessel. Detailed Implementation

[0021] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0022] like Figure 1-6 As shown, Figure 1 As shown, the pre-tensioning method for the binding wire rope of a large floating box based on a linear winch in this embodiment includes the following steps: Step 1: Several large pontoons 2 are symmetrically arranged on both sides of the wrecked vessel 3. Each large pontoon 2 has several evenly distributed through holes 6. Several linear winches 1 and several bollards 7 are arranged on the same side of the through holes 6. Step 2: Thread each traction thin steel wire rope A9 into the through hole 6 of the large pontoon 2. After passing through the through hole 6 of the large pontoon 2, the traction thin steel wire rope A9 is fixed to the cable pile 7 on the top of the large pontoon 2. Step 3: After the large pontoon 2 and the working mother ship 11 are in place with the cable, the crane of the working mother ship 11 will connect the traction thin steel wire rope A9 of the large pontoon 2 to the traction thin steel wire rope B10 on the side of the distressed vessel 3 in sequence. The traction thin steel wire rope B10 has been connected in advance to the bottom thick steel wire rope 8 located at the bottom of the distressed vessel 3. Step 4: The crane of the working mother ship 11 lifts the connected traction thin steel wire rope A 9 and traction thin steel wire rope B 10 and introduces them into the idler roller 5 and two movable clamps 4 of the linear winch 1, so that the bottom thick steel wire rope 8 is passed into the corresponding movable clamps 4 on the linear winch 1. Step 5: Large pontoons 2 are symmetrically arranged on both sides of the distressed vessel 3. One end of each bottom-crossing thick steel wire rope 8 eventually enters the movable clamp 4 of the linear winch 1, and the other end is led out by the traction thin steel wire rope A 9 on the symmetrical side of the distressed vessel 3 and anchored at the corresponding mooring bollard 7. Step 6: Start the linear winch 1. The two movable clamps 4 on the linear winch 1 work back and forth to pre-tighten each of the bottom thick steel wire ropes 8. Step 7: The large pontoon 2 begins to gradually move closer to the distressed vessel 3. The position of the large pontoon 2 is adjusted by the cables of the large pontoon 2 until the large pontoons 2 on both sides are completely close to the distressed vessel 3. Step 8: If the bottom thick steel wire rope 8 becomes slack during the undulation of the large pontoon 2, the bottom thick steel wire rope 8 will be further tightened by the linear winch 1 to ensure that the large pontoon 2 is firmly attached to the wrecked vessel 3.

[0023] Each large pontoon 2 has four through holes 6. Two linear winches 1 and two bollards 7 are provided on the same side of the through holes 6. The bollards 7 and the linear winches 1 are arranged alternately.

[0024] The axes of the two linear winches 1 and two bollards 7, which are alternately distributed on each large pontoon 2, are on the same vertical line as the center of the four through holes 6.

[0025] The number of large buoys 2 on one side of the distressed vessel 3 is set as needed according to the specifications of the distressed vessel 3.

[0026] In step 4, both movable grippers 4 of the linear winch 1 are wedge-shaped self-locking structures.

[0027] When tightening the bottom thick steel wire rope 8, the movable clamp 4 on the side close to the distressed vessel 3 opens, and the movable clamp 4 on the side away from the distressed vessel 3 locks and moves forward. Then the movable clamp 4 on the side away from the distressed vessel 3 opens, and the movable clamp 4 on the side close to the distressed vessel 3 locks and moves forward. The above process is repeated continuously, so that the large buoy 2 gradually moves closer to the distressed vessel 3.

[0028] As the large buoy 2 approaches the distressed vessel 3, it is controlled by the connecting cable between the large buoy 2 and the working mother vessel 11.

[0029] In step 7, after the large buoy 2 is fully against the distressed vessel 3, the two movable clamps 4 of the linear winch 1 are simultaneously locked to brake the vessel.

[0030] The base frame of the linear winch 1 is fixed to the top of the large floating box 2 by welding L-shaped steel plates.

[0031] The bottom-passing thick steel wire rope 8 and the traction thin steel wire rope B 10 are both arranged in the aforementioned construction procedures. The traction thin steel wire rope A 9 is pre-threaded into the through hole 6 of the large pontoon 2 before it arrives on site. After the large pontoon 2 arrives on site, it is first roughly positioned. The on-site operation mother ship 11 cooperates by arranging the hydraulic power station and control box of the linear winch 1 on the deck of the operation mother ship 11, and connecting and debugging the hydraulic power station and control box to ensure that the linear winch 1 is usable. Simultaneously, the operation mother ship 11 cooperates by connecting the end of the traction thin steel wire rope A9 at the position of the large pontoon 2, which exits from the lower end of the through hole 6, to the traction thin steel wire rope B10 on the side of the distressed vessel 3. The traction thin steel wire rope A9 passes through the roller 5 and two movable clamps 4 of the linear winch 1 in sequence at the upper end of the through hole 6 by manual means, and extends out from the tail of the linear winch 1. Simultaneously, the same arrangement is made for the large pontoons 2 at the symmetrical position of the distressed vessel 3. For each bottom-crossing thick steel wire rope 8, one end enters the linear winch 1 under the traction of the traction thin steel wire rope A9, and the other end is connected and anchored at the bollard 7 at the position of the large pontoon 2 on the opposite side. For the wire rope entering the linear winch 1, due to the size limitation of the movable clamp 4, the linear winch 1 cannot clamp or pull the traction wire rope A 9 or traction wire rope B 10. Therefore, it is necessary to use the crane of the on-site work mother ship 11 to lift the traction wire rope B 10 extending from the tail of the linear winch 1 at the upper end of the through hole 6, so that the traction wire rope A 9 and traction wire rope B 10 pass through the movable clamp 4 inside the linear winch 1 in sequence, and finally the bottom thick wire rope 8 passes through the movable clamp 4 of the linear winch 1. For the end of the bottom thick wire rope 8 anchored at the position of the large pontoon 2, the above action is repeated to pass the bottom thick wire rope 8 through the through hole 6 of the large pontoon 2 and fix it to the nearby bollard 7 to complete the anchoring work. The linear winch 1 is started to begin work, and the two movable clamps 4 will cooperate to tighten the bottom thick wire rope 8. When the bottom thick wire rope 8 is tightened, the large pontoon 2 will begin to shift and approach the distressed vessel 3. At this time, the position of the large pontoon 2 will be adjusted by the cable, the linear winch 1 will continue to work, and the bottom thick steel wire rope 8 will continue to tighten. The large pontoons 2 on both sides will further approach the distressed vessel 3 and completely rest against it, while the relative positions of the large pontoons 2 and the distressed vessel 3 remain unchanged. The linear winch 1 will continue to work, the positions of the large pontoons 2 and the distressed vessel 3 will remain unchanged, and the bottom thick steel wire rope 8 will begin to tighten formally. As the linear winch 1 gradually tightens, the bottom thick steel wire rope 8 will reach the ideal tightening state, ensuring that the large pontoons 2 and the distressed vessel 3 are firmly attached. In this way, all linear winches 1 will be tightened. After all the large pontoons 2 are fixed in place, the subsequent undulating operation of the distressed vessel 3 will begin. During the undulating process, if the bottom thick steel wire rope 8 becomes slack due to the shift between the distressed vessel 3 and the large pontoons 2, the pre-tightening of the bottom thick steel wire rope 8 can be continued by adjusting the linear winch 1 to ensure that the large pontoons 2 and the distressed vessel 3 are firmly attached.

[0032] This invention utilizes a linear winch 1 to actively and continuously tighten the bottom-crossing thick steel wire rope 8, ensuring that the rope reaches an ideal pre-tension state. This allows the large pontoon 2 to be firmly attached to the distressed vessel 3, fundamentally solving the risk of displacement or detachment of the large pontoon 2 due to insecure tying. Based on the linear winch 1, the method for pre-tightening the steel wire rope of the large pontoon 2 allows for the immediate activation of the linear winch 1 to re-tighten the bottom-crossing thick steel wire rope 8, maintaining continuous pre-tension. During the undulating operation of the distressed vessel 3, this method prevents the bottom-crossing thick steel wire rope 8 from slackening due to changes in the vessel's attitude, ensuring structural stability and safety throughout the operation cycle. It reduces safety accidents or project delays caused by tying failures, lowers the potential risk of salvage failure, and reduces subsequent disposal costs. This method uses a linear winch 1 for tightening, replacing the traditional method of manual or simple tool-based tightening, significantly reducing labor intensity, shortening tightening time, and accelerating the overall construction progress. It is suitable for urgent, difficult, and dangerous marine salvage operations. Linear winches 1 are pre-fixed to the top of the large pontoon 2, with their axis aligned with the through-hole 6 of the large pontoon 2, ensuring smooth passage of the wire rope. The hydraulic and control systems are centrally located on the deck of the mother ship 11, achieving modularization and rational layout of the equipment and reducing on-site adjustment time. By symmetrically arranging the linear winches 1 and ensuring that each path of the symmetrical through-hole 6 has a corresponding linear winch 1, multiple bottom-passing thick wire ropes 8 can be tightened synchronously or as needed, ensuring balanced force on the large pontoon 2. Furthermore, the linear winches 1 have a large rated tensile force and are equipped with two movable clamps 4 that work back and forth to tighten, enabling stable and controllable pre-tension application, avoiding equipment or structural damage caused by uneven or sudden force distribution, and improving the reliability of the overall lashing system. This method has been studied and verified in conjunction with the large pontoon 2 and the matching linear winches 1, and is applicable to the buoyancy and salvage project of the large pontoon 2. It can be adjusted according to different pontoon sizes and through-hole 6 layouts, and has strong applicability for promotion.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch, characterized in that, Includes the following steps: Step 1: Several large floating boxes (2) are symmetrically arranged on both sides of the wrecked vessel (3). Each large floating box (2) has several evenly distributed through holes (6). Several linear winches (1) and several bollards (7) are arranged on the same side of the through holes (6). Step 2: Insert each traction thin steel wire rope A (9) into the through hole (6) of the large pontoon (2). After the traction thin steel wire rope A (9) passes through the through hole (6) of the large pontoon, it is fixed to the cable pile (7) on the top of the large pontoon (2). Step 3: After the large pontoon (2) and the working mother ship (11) are in place with the cable, the crane of the working mother ship (11) will connect the traction thin steel wire rope A (9) of the large pontoon (2) to the traction thin steel wire rope B (10) on the side of the wrecked ship (3) in sequence. The traction thin steel wire rope B (10) has been connected in advance to the bottom thick steel wire rope (8) at the bottom of the wrecked ship (3). Step 4: The crane of the working mother ship (11) lifts the connected traction thin steel wire rope A (9) and traction thin steel wire rope B (10) and introduces them into the idler roller (5) and two movable clamps (4) of the linear winch (1), so that the bottom thick steel wire rope (8) is inserted into the movable clamps (4) on the corresponding linear winch (1). Step 5: Large pontoons (2) are symmetrically arranged on both sides of the wrecked vessel (3). One end of each bottom-crossing thick steel wire rope (8) eventually enters the movable clamp (4) of the linear winch (1), and the other end is led out by the traction thin steel wire rope A (9) on the symmetrical side of the wrecked vessel (3) and anchored at the corresponding mooring bollard (7). Step 6: Start the linear winch (1). The two movable clamps (4) on the linear winch (1) work back and forth to pre-tighten each bottom thick steel wire rope (8). Step 7: The large pontoon (2) begins to gradually move closer to the distressed vessel (3). The position of the large pontoon (2) is adjusted by the cable of the large pontoon (2) until the large pontoons (2) on both sides are completely close to the distressed vessel (3). Step 8: If the bottom thick steel wire rope (8) becomes loose during the undulation of the large pontoon (2), the bottom thick steel wire rope (8) will be further tightened by the linear winch (1) to ensure that the large pontoon (2) and the wrecked vessel (3) are firmly attached.

2. The method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch according to claim 1, characterized in that, Each large pontoon (2) has four through holes (6). On the same side of the through holes (6), there are two linear winches (1) and two bollards (7). The bollards (7) and linear winches (1) are arranged alternately.

3. The method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch according to claim 2, characterized in that, The axes of the two linear winches (1) and two bollards (7) that are alternately distributed on each large pontoon (2) are on the same vertical line as the center of the four through holes (6).

4. The method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch according to claim 1, characterized in that, The number of large pontoons (2) on one side of the distressed vessel (3) is set as needed according to the specifications of the distressed vessel (3).

5. The method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch according to claim 1, characterized in that, In step 4, both movable grippers (4) of the linear winch (1) are wedge-shaped self-locking structures.

6. The method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch according to claim 5, characterized in that, When tightening the bottom thick steel wire rope (8), the movable clamp (4) on the side close to the wrecked vessel (3) opens, and the movable clamp (4) on the side away from the wrecked vessel (3) locks and moves forward. Then the movable clamp (4) on the side away from the wrecked vessel (3) opens, and the movable clamp (4) on the side close to the wrecked vessel (3) locks and moves forward. The above process is repeated continuously, so that the large pontoon (2) gradually moves closer to the wrecked vessel (3).

7. The method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch according to claim 1, characterized in that, As the large buoy (2) approaches the distressed vessel (3), it is controlled by the connecting cable between the large buoy (2) and the working mother vessel (11).

8. The method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch according to claim 1, characterized in that, In step 7, after the large buoy (2) is fully against the wrecked vessel (3), the two movable clamps (4) of the linear winch (1) are simultaneously locked to brake against the vessel.

9. The method for pre-tensioning the steel wire rope binding of a large pontoon based on a linear winch according to claim 1, characterized in that, The base frame of the linear winch (1) is welded and fixed to the top of the large pontoon (2) by an L-shaped steel plate.

Images