Subsea buoyant structure for jacket removal

Abstract

The application discloses a kind of underwater pontoon structures of jacket free from underwater removal, which includes pontoon and upper connecting part, upper connecting part is connected with pontoon, upper connecting part is connected between jacket leg, lower connecting part is connected between jacket leg, and upper connecting part is clamped on lower connecting part by fixing assembly;Cut along the junction of upper connecting part and jacket leg, and the pontoon can be moved by moving the upper connecting part.The underwater pontoon structure of jacket free from underwater removal provided by the application is designed to be lifted off by the bottom, and only the first pull bar on the water needs to be cut during disassembly, and the pontoon can be separated from the lower connecting part by lifting upward, without underwater operation throughout, without underwater operation risk, reducing the operation difficulty, while avoiding damage to the jacket caused by underwater cutting.The application adjusts the buckling position of the bottom fixing assembly to adapt to other jacket projects, improves the reuse rate and reduces the cost.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering technology, and in particular relates to an underwater pontoon structure that eliminates the need for underwater dismantling of a jacket. Background Technology

[0002] The installation of jacket supports requires buoyancy support from floats. However, current conventional jacket support floats are mostly fixed to the jacket legs or tie rods using fully welded or bolted connections. While this connection method ensures stability during installation, it presents numerous challenges during disassembly. Dismantling operations rely on underwater cutting or underwater bolt removal. Underwater operations are greatly affected by sea conditions (such as water flow speed, visibility, and wave impact), making them difficult to operate, with little room for error, and significantly riskier than surface operations. On the other hand, underwater operations are inefficient, especially for deep-water projects, where underwater cutting requires specialized diving equipment and personnel, significantly increasing the construction period and costs. If the operational precision is not properly controlled, it can easily damage the jacket structure, creating potential safety hazards for subsequent projects.

[0003] In addition, common air-filled floats also have the problem of being difficult to manage after disassembly: after the air-filled floats are removed, they are easily out of control due to buoyancy and drift randomly under the push of water flow and waves, which can easily cause collisions with the jacket structure and cause secondary damage.

[0004] Therefore, there is an urgent need to design an underwater pontoon structure that eliminates the need for underwater dismantling of the jacket support, in order to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide an underwater pontoon structure that eliminates the need for underwater dismantling of a jacket foundation. This structure features a simple connection method, high structural reliability, and the ability to achieve rapid and non-destructive dismantling. It eliminates the need for high-risk underwater operations and avoids damage to the jacket foundation due to uncontrolled collisions after dismantling by balancing the pontoon's own weight and buoyancy.

[0006] To achieve the above objectives, the specific technical solution of the underwater pontoon structure for the jacket support that is exempt from underwater dismantling according to the present invention is as follows: An underwater pontoon structure for a jacket support that can be removed underwater includes a pontoon and an upper connecting part. The upper connecting part is connected to the pontoon and is connected between the legs of the jacket support. A lower connecting part is connected between the legs of the jacket support. The upper connecting part is snapped onto the lower connecting part by a fixing component. By cutting along the connection between the upper connecting part and the legs of the jacket support, the pontoon can be moved by moving the upper connecting part.

[0007] Furthermore, the pontoon includes a cylindrical body and reinforcing rings, which are spaced apart inside the cylindrical body along its length.

[0008] Furthermore, the cylinder is equipped with a water inlet valve, which is used to adjust the balance between the cylinder's gravity and buoyancy.

[0009] Furthermore, a pressure gauge is connected to the water inlet valve to monitor the internal pressure of the cylinder.

[0010] Furthermore, the upper connecting part includes a first tie rod and a second tie rod. The second tie rod is connected to the cylinder body and is connected to the first tie rod at intervals. The two ends of the first tie rod are fixedly connected between the guide frame legs.

[0011] Furthermore, by cutting along the connection between the first tie rod and the guide frame leg, the cylinder can be moved by moving the first tie rod.

[0012] Furthermore, a lifting lug is connected to the first tie rod, and a traction cable is connected to the lifting lug to move the first tie rod, the second tie rod, and the cylinder as a whole.

[0013] Furthermore, the fixing component includes a side plate and a saddle plate. The side plate is connected to the saddle plate, and the end of the side plate away from the saddle plate is connected to the second tie rod. The saddle plate abuts against the lower connecting part.

[0014] Furthermore, the fixing component also includes a rubber pad, and the saddle plate abuts against the lower connecting part through the rubber pad.

[0015] Furthermore, a limiting plate is connected to the end of the saddle-shaped plate away from the side plate, and the limiting plate abuts against the lower connecting part.

[0016] The underwater pontoon structure of the jacket support that eliminates underwater dismantling of the present invention has the following advantages: (1) The present invention uses a bottom lifting and detachment design. When disassembling, only the first tie rod above the water needs to be cut, and then the float can be lifted upward to detach from the lower connection part. No underwater operation is required throughout the process, there is no risk of underwater operation, the difficulty of operation is reduced, and the damage to the guide frame caused by underwater cutting is avoided.

[0017] (2) The water inlet valve at the end of the float of the present invention can flexibly adjust the balance between gravity and buoyancy, so that the weight of the float slightly exceeds its buoyancy. After disassembly, the attitude of the float can be controlled, avoiding sudden loss of control and collision with the guide frame.

[0018] (3) The disassembled float of the present invention can be adapted to other guide frame projects by adjusting the snap-fit ​​position of the bottom fixing component, thereby improving the reuse rate and reducing costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the underwater pontoon structure for the jacket support of the present invention, which is designed to be removed underwater. Figure 2 This is a schematic diagram of the overall structure of the pontoon of the present invention; Figure 3This is a schematic diagram of the overall structure of the fixing component of the present invention.

[0020] Explanation of markings in the diagram: 1. Float; 11. Cylinder body; 12. Reinforcing ring; 13. Inlet valve; 2. Upper connection part; 21. First tie rod; 22. Second tie rod; 3. Guide frame leg; 4. Lower connection part; 5. Fixing assembly; 51. Side plate; 52. Saddle plate; 53. Rubber pad; 54. Limiting plate; 6. Lifting lug. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] The following is a reference to the appendix. Figure 1 To be continued Figure 3 This invention describes an underwater pontoon structure for a jacket structure that allows for underwater removal.

[0024] like Figure 1 As shown, the underwater pontoon structure of the jacket support that is exempt from underwater dismantling in this invention includes a pontoon 1 and an upper connecting part 2. The upper connecting part 2 is connected to the pontoon 1 and is connected between the jacket support legs 3. A lower connecting part 4 is connected between the jacket support legs 3. The upper connecting part 2 is snapped onto the lower connecting part 4 by a fixing component 5. By cutting along the connection between the upper connecting part 2 and the jacket support legs 3, the pontoon 1 can be moved by moving the upper connecting part 2.

[0025] With its bottom-pull-out design, disassembly only requires cutting the first tie rod 21 above water and then pulling it upwards to detach the float 1 from the lower connecting part 4. The entire process requires no underwater operation, eliminating the risk of underwater work, reducing operational difficulty, and avoiding damage to the guide frame caused by underwater cutting.

[0026] Furthermore, such as Figure 1 and Figure 2As shown, the float 1 consists of a cylinder 11 and multiple reinforcing rings 12. The reinforcing rings 12 are connected at intervals along the length of the cylinder 11 inside the cylinder 11 to enhance the structural strength. Meanwhile, a water inlet valve 13 is provided on the cylinder 11 to adjust the balance between the weight and buoyancy of the cylinder 11. A pressure gauge is connected to the water inlet valve 13 to monitor the internal pressure of the cylinder 11.

[0027] Furthermore, such as Figure 1 As shown, the upper connecting part 2 is composed of a first tie rod 21 and multiple second tie rods 22. The multiple second tie rods 22 are all connected to the cylinder 11, and the multiple second tie rods 22 are connected to the first tie rod 21 at intervals, and the two ends of the first tie rod 21 are fixedly connected between the guide frame legs 3.

[0028] When it is necessary to lift the float 1, cut along the connection between the first tie rod 21 and the guide frame leg 3. The cylinder 11 can be moved by moving the first tie rod 21. A lifting lug 6 is fixedly connected to the first tie rod 21. By connecting the traction cable to the lifting lug 6, the first tie rod 21, the second tie rod 22 and the cylinder 11 can be moved as a whole by the traction cable.

[0029] Furthermore, such as Figure 1 and Figure 3 As shown, the fixing component 5 includes a side plate 51 and a saddle plate 52. The saddle plate 52 is fixedly connected to the side plate 51. The side plate 51 is connected to the second tie rod 22 at the end away from the saddle plate 52, so that the side of the saddle plate 52 away from the second tie rod 22 abuts against the lower connecting part 4.

[0030] The fixing component 5 also includes a rubber pad 53. The saddle plate 52 abuts against the lower connecting part 4 through the rubber pad 53. At the same time, a limiting plate 54 is connected to the end of the saddle plate 52 away from the side plate 51. The limiting plate 54 abuts against the lower connecting part 4, further enhancing the snapping effect between the saddle plate 52 and the lower connecting part 4.

[0031] The working principle of the underwater pontoon structure for eliminating underwater dismantling of the jacket structure in this invention is as follows: First, cut along the connection between the first tie rod 11 and the guide frame leg 3 to separate the first tie rod 11 from the guide frame leg 3; Then, the traction cable is connected to the lug of the first tie rod 11, and traction force is provided through the traction cable; Then, the traction cable is retrieved, causing the saddle plate 52 that abuts against the lower connecting part 4 to disengage; Finally, the traction cable was continuously retrieved to achieve rapid and non-destructive dismantling of buoy 1.

[0032] Based on the underwater pontoon structure that eliminates the need for underwater dismantling of the jacket, this invention allows for flexible adjustment of the balance between gravity and buoyancy by adjusting the water inlet valve 13 at the end of the pontoon 1. This ensures that the weight of the pontoon 1 slightly exceeds its buoyancy, making the attitude of the pontoon controllable after dismantling and preventing sudden loss of control and collision with the jacket.

[0033] 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. An underwater pontoon structure for a jacket support that can be removed underwater, characterized in that, It includes a buoy and an upper connecting part. The upper connecting part is connected to the buoy and is connected between the jacket legs. A lower connecting part is connected between the jacket legs. The upper connecting part is snapped onto the lower connecting part by a fixing component. By cutting along the connection between the upper connecting part and the jacket leg, the buoy can be moved by moving the upper connecting part.

2. The underwater pontoon structure for avoiding underwater dismantling of the jacket structure according to claim 1, characterized in that, The pontoon includes a cylinder and reinforcing rings, which are connected at intervals inside the cylinder along its length.

3. The underwater pontoon structure for jacket support that is exempt from underwater dismantling according to claim 2, characterized in that, The cylinder is equipped with a water inlet valve, which is used to adjust the balance between the cylinder's gravity and buoyancy.

4. The underwater pontoon structure for jacket support that is exempt from underwater dismantling according to claim 3, characterized in that, A pressure gauge is connected to the inlet valve to monitor the internal pressure of the cylinder.

5. The underwater pontoon structure for avoiding underwater dismantling of the jacket structure according to claim 1, characterized in that, The upper connecting part includes a first tie rod and a second tie rod. The second tie rod is connected to the cylinder body and is connected to the first tie rod at intervals. The two ends of the first tie rod are fixedly connected between the legs of the guide frame.

6. The underwater pontoon structure for jacket support that is exempt from underwater dismantling according to claim 5, characterized in that, Cut along the connection between the first tie rod and the guide frame leg, and the cylinder can be moved by moving the first tie rod.

7. The underwater pontoon structure for jacket support that is exempt from underwater dismantling according to claim 5, characterized in that, The first tie rod is connected to a lifting lug. By connecting a traction cable to the lifting lug, the first tie rod, the second tie rod, and the cylinder as a whole can be moved.

8. The underwater pontoon structure for avoiding underwater dismantling of the jacket structure according to claim 1, characterized in that, The fixing component includes a side plate and a saddle plate. The side plate is connected to the saddle plate, and the end of the side plate away from the saddle plate is connected to the second tie rod. The saddle plate abuts against the lower connecting part.

9. The underwater pontoon structure for jacket support that is exempt from underwater dismantling according to claim 8, characterized in that, The fixing component also includes a rubber pad, through which the saddle plate abuts against the lower connecting part.

10. The underwater pontoon structure for jacket support that is exempt from underwater dismantling according to claim 8, characterized in that, A limit plate is connected to the end of the saddle-shaped plate away from the side plate, and the limit plate abuts against the lower connecting part.

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