Deep water pipelaying vessel for offshore construction

Abstract

This invention discloses a deep-water pipelaying vessel for marine engineering construction, belonging to the field of marine engineering construction technology. The vessel includes a hull, with a support frame fixedly installed on one side and multiple loading mechanisms fixedly installed at the front top of the hull for loading pipes. This invention utilizes a gantry crane assembly and multiple clamping and welding mechanisms to clamp and weld the pipes. After welding, the pipes are directly hoisted and transported, reducing the need for clamp resetting. This device directly welds the pipes during the clamping process without needing to release the clamps, and directly lifts them to the next area via the gantry crane assembly, significantly improving overall laying efficiency.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering construction technology, and specifically relates to a deep-water pipelaying vessel used for marine engineering construction. Background Technology

[0002] Deepwater pipelaying vessels are high-tech specialized engineering vessels used for laying underwater pipelines such as marine oil and gas pipelines and submarine cables. They are core equipment for deepwater marine engineering construction, maintaining their position through a dynamic positioning system and utilizing a large integrated pipelaying line to continuously weld, inspect, and corrode single steel pipes or flexible pipes, laying them to the designed seabed route. Unlike shallow-water pipelaying vessels, the key characteristics of deepwater pipelaying vessels are: Core positioning system: They are generally equipped with a DP-3 level dynamic positioning system, which does not rely on anchoring and can accurately maintain the vessel's position even in harsh sea conditions, ensuring that the pipeline is precisely positioned along a preset trajectory; Core operation mode: Primarily using the S-type pipelaying method, equipped with huge fixed or tilting pipe supports to control the bending stress of the pipeline in deep water. Some ultra-deepwater vessels are also equipped with J-type pipelaying systems, suitable for large-diameter, ultra-deepwater pipelines.

[0003] In existing pipelaying vessels, the process involves first feeding two pipes to the welding area via a loading mechanism, then welding them together. This process is repeated to create multiple sets of pipes, which are then welded together to form a long pipe. Once a certain length is reached, the pipes are laid to the seabed via a support frame, allowing for simultaneous welding and laying. However, the welding process requires clamping and securing the two pipes before welding. After welding, the clamps need to be released before the pipes are transferred to the next area for welding, and finally, they are laid. This entire process is quite cumbersome and significantly reduces the overall laying efficiency of the vessel. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a deep-water pipelaying vessel for marine engineering construction.

[0005] The technical solution adopted to solve the above technical problems is: a deep-water pipelaying engineering vessel for marine engineering construction, including a hull, a support frame fixedly installed on one side of the hull, and multiple feeding mechanisms fixedly installed at the top front end of the hull, the multiple feeding mechanisms being used for feeding pipes; The top of the hull is fixedly installed with a first conveying assembly, a second conveying assembly, and a third conveying assembly near the rear of the multiple feeding mechanisms. A pushing mechanism is fixedly installed on the top of the hull near the first and third conveying assemblies. A fourth conveying assembly is fixedly installed on the top of the hull near the rear ends of the first, second, and third conveying assemblies, respectively. A fifth conveying assembly is fixedly installed on the top of the hull near the support frame. A gantry crane assembly is installed at the center of the top of the hull, and the gantry crane assembly is equipped with multiple clamping and welding mechanisms.

[0006] Furthermore, multiple roller assemblies are fixedly installed on the support frame.

[0007] The above technical solution facilitates the transportation of welded strip-shaped pipes. After the pipes enter the water from the horizontal section of the hull, they need to bend under gravity to enter the water. The support frame can strictly control the bending radius of the pipes to ensure that it is always less than the elastic limit of the material, thus preventing the pipes from undergoing plastic deformation or bending damage.

[0008] Furthermore, the feeding mechanism includes a support frame fixedly connected to the front end of the hull. Multiple support arc plates are fixedly connected to the top of the support frame. Two first support shells are fixedly connected to the front end of the support frame. Conveyor belt assemblies are installed inside each of the two first support shells. A first motor is installed on one side of each of the two first support shells. Two second support shells are fixedly connected to the rear end of the support frame. A set of rotating shafts is rotatably connected inside each of the two second support shells. Sprockets are fixedly connected to both ends of the outer walls of the two sets of rotating shafts. Multiple sprockets on the two sets of rotating shafts are engaged with chains. Multiple guide blocks are fixedly connected to the two chains. A second motor is fixedly installed on one side of each of the two second support shells.

[0009] With the above technical solution, when feeding pipes, multiple pipes are first placed on multiple supporting arc plates. Two first motors are started, which drive the corresponding conveyor belt components to transport the pipes. When the pipes are transported close to the two guide blocks, the guide blocks hold the pipes in place to prevent slippage. At this time, two second motors are started, which drive the connected rotating shaft to rotate, which in turn drives the connected sprocket to rotate. The remaining sprockets cooperate to drive multiple chain drives, which in turn drive multiple guide blocks to transport the pipes to the first conveying component. Similarly, the other feeding mechanisms operate simultaneously to transport the corresponding pipes to the second and third conveying components respectively.

[0010] Furthermore, the two first motors drive their respective conveyor belt assemblies, and the output shafts of the two second motors are fixedly connected to adjacent rotating shafts.

[0011] The above technical solution can automatically transport pipes and transport multiple pipes at the same time, which facilitates the subsequent welding of the ends of multiple pipes, greatly improving the overall laying efficiency.

[0012] Furthermore, the first conveying component, the second conveying component, the third conveying component, the plurality of fourth conveying components, and the fifth conveying component have the same structure.

[0013] Through the above technical solution, when the pipes at the top of the first, second, and third conveying components are hoisted to the top of multiple fourth conveying components by the gantry crane assembly, they can be transported to the top of the fifth conveying component by the multiple fourth conveying components and then conveyed to the support frame, thereby realizing the rapid conveying of the welded pipes and improving the overall laying efficiency.

[0014] Furthermore, the pushing mechanism includes a fixed frame fixedly connected to the top of the hull, and a first hydraulic cylinder is fixedly installed on the top of the fixed frame. A push plate is fixedly connected to one end of the piston of the first hydraulic cylinder.

[0015] With the above technical solution, when multiple pipes are transported to the top of the first conveying assembly, the second conveying assembly, and the third conveying assembly, two first hydraulic cylinders are activated simultaneously. Each cylinder pushes a connected push plate through a piston, thereby pushing the pipes that are close to each other. This brings the pipes on the first and third conveying assemblies close to the pipes on the second conveying assembly, and their ends fit together, which facilitates subsequent end-to-end welding.

[0016] Furthermore, the gantry crane assembly is equipped with multiple rope lifting mechanisms, and multiple clamping and welding mechanisms are respectively installed at the bottom end of the corresponding rope lifting mechanism.

[0017] The above technical solution allows the gantry crane assembly and multiple rope lifting mechanisms to drive the corresponding clamping and welding mechanisms to move up, down, and horizontally, thereby facilitating the welding and hoisting transportation of pipes and improving overall laying efficiency.

[0018] Furthermore, the clamping welding mechanism includes a first arc-shaped outer shell installed at the bottom of the rope lifting mechanism. Two second arc-shaped outer shells are rotatably connected to the bottom of the first arc-shaped outer shell. Two second hydraulic cylinders are rotatably connected to the outer walls of both sides of the first arc-shaped outer shell. Third hydraulic cylinders are fixedly installed on the inner walls of both sides of the first arc-shaped outer shell. A first clamping block is fixedly connected to one end of the pistons of the plurality of third hydraulic cylinders. A fourth hydraulic cylinder is fixedly installed on the inner walls of both sides of the two second arc-shaped outer shells. A second clamping block is fixedly connected to one end of the pistons of the two fourth hydraulic cylinders. A first arc-shaped guide rail and a first arc-shaped gear ring are fixedly connected to the inner wall of the top of the first arc-shaped outer shell. A second arc-shaped guide rail and a second arc-shaped gear ring are fixedly connected to the inner walls of the bottom of the two second arc-shaped outer shells. A slider is slidably connected to the first arc-shaped guide rail. A third motor is fixedly installed on the slider. A gear is fixedly connected to one end of the piston of the third motor. A welding torch is fixedly installed on the slider near the third motor.

[0019] Using the above technical solution, during pipe welding, a gantry crane assembly transports multiple clamping welding mechanisms to directly above multiple pipes, with two welding torches positioned directly above the weld seam between the pipes. Simultaneously, multiple third hydraulic cylinders are activated, pushing two connected second arc-shaped outer shells to open them, facilitating subsequent pipe clamping. Under the action of multiple rope lifting mechanisms, the corresponding clamping welding mechanisms move downwards. When they reach a designated height, where the center of the first arc-shaped outer shell and the two second arc-shaped outer shells aligns with the center of the pipe, the pistons of the multiple third hydraulic cylinders retract, causing the two connected second arc-shaped outer shells to close, thus closing the first arc-shaped guide rail and the two second arc-shaped guide rails, and the first arc-shaped gear ring and the two second arc-shaped gear rings. At the same time, the third hydraulic cylinders are activated... The pressure cylinder and multiple fourth hydraulic cylinders each push the connected first and second clamping blocks via pistons, causing the multiple first and second clamping blocks to simultaneously clamp the outer wall of the pipe, thus achieving clamping and fixing. Then, the third motor is started, which drives the gear to rotate, causing the gear to mesh and roll on the first arc-shaped gear ring and the two second arc-shaped gear rings, thereby driving the slider to slide on the first arc-shaped guide rail and the two second arc-shaped guide rails, thereby driving the welding torch to move in a ring around the pipe, achieving ring welding of the weld seam. The clamping and welding mechanism located at the top between the first and second conveying components, and the clamping and welding mechanism located between the second and third conveying components, can clamp and weld the pipe. The remaining clamping and welding mechanisms simply clamp the pipe, thus achieving simultaneous clamping and welding of multiple pipes, which is highly efficient.

[0020] Furthermore, in the combined state, the first arc-shaped outer shell and the two second arc-shaped outer shells are joined together to form a circle, and one end of each of the multiple second hydraulic cylinder pistons is rotatably connected to the corresponding second arc-shaped outer shell.

[0021] Through the above technical solution, after welding multiple pipes, multiple clamping welding mechanisms maintain a clamping state. Under the action of the gantry crane assembly, the welded pipes are hoisted onto multiple fourth conveying components. The multiple fourth conveying components then transport the pipes towards the fifth conveying component. At this point, subsequent welded pipes are hoisted onto the multiple fourth conveying components again through the gantry crane assembly. Driven by the multiple fourth conveying components, subsequent pipes are brought into contact with the previously welded pipes end to end. Then, under the action of the gantry crane assembly, the clamping welding mechanism near the first and second conveying components is aligned with the weld seams of the two pipes. Then, it is clamped and welded, realizing the re-welding and assembly of the welded pipes. Throughout the process, the gantry crane assembly, in conjunction with multiple clamping welding mechanisms, clamps and welds the pipes. After welding, the pipes are directly hoisted and transported. The entire process reduces the clamp reset step. This device directly welds the clamped pipes without loosening the clamps, and directly hoists them to the next area through the gantry crane assembly, greatly improving the overall laying efficiency.

[0022] Furthermore, in the combined state, the first arc-shaped guide rail and the two second arc-shaped guide rails come together to form a circle, the first arc-shaped gear ring and the two second arc-shaped gear rings come together to form a circle, and the gear meshes with the first arc-shaped gear ring.

[0023] The above technical solution enables the mechanism to clamp not only the pipe during welding, but also during hoisting. This improves clamping accuracy during welding and facilitates handling during hoisting, making it highly functional.

[0024] The beneficial effects of the present invention are as follows: (1) The present invention designs a gantry hoisting assembly and multiple clamping and welding mechanisms. The gantry hoisting assembly, together with multiple clamping and welding mechanisms, achieves clamping and welding of the pipe material. After welding, it is directly hoisted and transported. The clamp reset step is reduced in the whole process. The device directly welds the pipe material during the clamping process without loosening the clamps. It is directly hoisted to the next area by the gantry hoisting assembly, which greatly improves the overall laying efficiency; (2) The present invention uses multiple clamping and welding mechanisms, which can not only clamp the pipe material during welding, but also clamp it during hoisting. This improves the clamping accuracy during welding and makes it convenient to handle the pipe material during hoisting. It has strong functionality; (3) The present invention designs multiple feeding mechanisms, which can automatically transport the pipe material and transport multiple pipe materials at the same time. This facilitates the simultaneous welding of the first and last ends of multiple pipe materials, which greatly improves the overall laying efficiency. Attached Figure Description

[0025] Figure 1 This is a first-view overall appearance view of the present invention; Figure 2 This is a second-view overall appearance view of the present invention; Figure 3This is the overall front view of the present invention; Figure 4 This is a schematic diagram of the support rack structure of the present invention; Figure 5 This is a schematic diagram of the feeding mechanism, the first conveying component, the pushing mechanism, and the fourth conveying component of the present invention; Figure 6 This is a schematic diagram of the feeding mechanism of the present invention; Figure 7 for Figure 2 A magnified view of a section at point A in the middle; Figure 8 This is a schematic diagram of the gantry hoisting assembly structure of the present invention; Figure 9 This is a schematic diagram of the clamping and welding mechanism of the present invention; Figure 10 This is a schematic diagram of the internal parts structure of the clamping and welding mechanism of the present invention; Figure 11 This is a schematic diagram of the first and second arc-shaped gear rings of the present invention.

[0026] Reference numerals: 1. Hull; 2. Support frame; 21. Roller assembly; 3. Feeding mechanism; 301. Support frame; 302. Support arc plate; 303. First support shell; 304. Conveyor belt assembly; 305. First motor; 306. Second support shell; 307. Rotating shaft; 308. Sprocket; 309. Chain; 310. Guide block; 311. Second motor; 4. First conveying assembly; 41. Second conveying assembly; 42. Third conveying assembly; 5. Pushing mechanism; 501. Fixing frame; 502. First hydraulic cylinder; 503. Push plate; 6. 7. Fourth conveying assembly; 8. Fifth conveying assembly; 9. Gantry hoisting assembly; 10. Rope lifting mechanism; 11. Clamping and welding mechanism; 12. First arc-shaped outer shell; 13. Second arc-shaped outer shell; 14. Second hydraulic cylinder; 15. Third hydraulic cylinder; 16. First clamping block; 17. Fourth hydraulic cylinder; 18. Second clamping block; 19. First arc-shaped guide rail; 10. First arc-shaped gear ring; 10. Second arc-shaped guide rail; 11. Second arc-shaped gear ring; 12. Slider; 13. Third motor; 14. Gear; 15. Welding torch. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] like Figures 1-5As shown in this embodiment, a deep-water pipelaying vessel for marine engineering construction includes a hull 1. A support frame 2 is fixedly installed on one side of the hull 1. Multiple roller assemblies 21 are fixedly installed on the support frame 2 to facilitate the transport of welded strip-shaped pipes. After the pipes enter the water from the horizontal section of the hull 1, they need to bend into the water under the action of gravity. The support frame 2 can strictly control the bending radius of the pipes to ensure that it is always less than the elastic limit of the material, preventing plastic deformation or bending damage to the pipes. Multiple feeding mechanisms 3 are used to feed the pipes. A first conveying assembly 4, a second conveying assembly 41, and a third conveying assembly 42 are fixedly installed on the top of the hull 1 near the rear end of the multiple feeding mechanisms 3, respectively. The second conveying assembly 41, the third conveying assembly 42, the multiple fourth conveying assemblies 6, and the fifth conveying assembly 7 have the same structure. When the pipes at the top of the first conveying assembly 4, the second conveying assembly 41, and the third conveying assembly 42 are hoisted to the top of the multiple fourth conveying assemblies 6 by the gantry crane assembly 8, they can be transported to the top of the fifth conveying assembly 7 by the multiple fourth conveying assemblies 6 and then transported to the support frame 2, thereby realizing the rapid transport of the welded pipes and improving the overall laying efficiency. The top of the hull 1 is fixedly installed with fourth conveying assemblies 6 near the rear ends of the first conveying assembly 4, the second conveying assembly 41, and the third conveying assembly 42, respectively. The top of the hull 1 is fixedly installed with the fifth conveying assembly 7 on the side near the support frame 2.

[0029] like Figures 1-6As shown, multiple feeding mechanisms 3 are fixedly installed at the front top of the hull 1. Each feeding mechanism 3 includes a support frame 301 fixedly connected to the front end of the hull 1. Multiple support arc plates 302 are fixedly connected to the top of the support frame 301. Two first support shells 303 are fixedly connected to the front end of the support frame 301. Conveyor belt assemblies 304 are installed inside each of the two first support shells 303. A first motor 305 is installed on one side of each of the two first support shells 303. Two second supports are fixedly connected to the rear end of the support frame 301. The outer casing 306 and the two second supporting outer casings 306 each have a set of rotating shafts 307 rotatably connected inside. Both ends of the outer walls of the two sets of rotating shafts 307 are fixedly connected to sprockets 308. Multiple sprockets 308 on the two sets of rotating shafts 307 are meshed with chains 309. Multiple guide blocks 310 are fixedly connected to the two chains 309. A second motor 311 is fixedly installed on one side of each of the two second supporting outer casings 306. When feeding pipes, multiple pipes are first placed on multiple supporting arc plates 302, and then the two first motors are started. 305, thereby driving the corresponding conveyor belt assembly 304 to transmit power, thus realizing the conveying of pipes. When the pipes are conveyed to the vicinity of the two guide blocks 310, the multiple guide blocks 310 abut against the pipes and prevent slippage. At this time, the two second motors 311 are started, thereby driving the connected rotating shaft 307 to rotate, thereby driving the connected sprocket 308 to rotate. The remaining sprockets 308 cooperate to drive the multiple chains 309 to transmit power, thereby driving the multiple guide blocks 310 to transmit power, thereby driving the pipes to be conveyed and conveyed to the first conveying assembly 4. Similarly, the other feeding mechanisms 3 operate at the same time, thereby conveying the corresponding pipes to the second conveying assembly 41 and the third conveying assembly 42 respectively. The two first motors 305 drive the corresponding conveyor belt assembly 304 respectively. The output shafts of the two second motors 311 are fixedly connected to the adjacent rotating shafts 307 respectively, which can automatically convey the pipes and can convey multiple pipes at the same time, which is convenient for subsequent simultaneous welding of the beginning and end of multiple pipes, greatly improving the overall laying efficiency.

[0030] like Figures 1-7 As shown, a pushing mechanism 5 is fixedly installed on the top of the hull 1 near the first conveying assembly 4 and the third conveying assembly 42. The pushing mechanism 5 includes a fixed frame 501 fixedly connected to the top of the hull 1. A first hydraulic cylinder 502 is fixedly installed on the top of the fixed frame 501. A push plate 503 is fixedly connected to one end of the piston of the first hydraulic cylinder 502. When multiple pipes are transported to the top of the first conveying assembly 4, the second conveying assembly 41 and the third conveying assembly 42 respectively, the two first hydraulic cylinders 502 are activated at the same time. Both cylinders push the push plate 503 connected to them through the piston, thereby pushing the pipes that are close to each other. This brings the pipes on the first conveying assembly 4 and the third conveying assembly 42 close to the pipes on the second conveying assembly 41 at the same time, and they fit together end to end, which is convenient for subsequent end welding.

[0031] like Figures 1-8 As shown, a gantry crane assembly 8 is installed at the top center of the hull 1. The gantry crane assembly 8 is equipped with multiple rope lifting mechanisms 81, and multiple clamping welding mechanisms 9 are respectively installed at the bottom of the corresponding rope lifting mechanisms 81. The gantry crane assembly 8 and the multiple rope lifting mechanisms 81 can drive the corresponding clamping welding mechanisms 9 to move up and down and horizontally, thereby facilitating the welding and lifting transportation of pipes and improving the overall laying efficiency.

[0032] like Figures 1-11As shown, the gantry crane assembly 8 is equipped with multiple clamping and welding mechanisms 9. Each clamping and welding mechanism 9 includes a first arc-shaped outer shell 901 installed at the bottom of the rope lifting mechanism 81. Two second arc-shaped outer shells 902 are rotatably connected to the bottom of the first arc-shaped outer shell 901. Two second hydraulic cylinders 903 are rotatably connected to the outer walls of both sides of the first arc-shaped outer shell 901. Third hydraulic cylinders 904 are fixedly installed on the inner walls of both sides of the first arc-shaped outer shell 901. A first clamping block 905 is fixedly connected to one end of the piston of each of the multiple third hydraulic cylinders 904. A fourth hydraulic cylinder 906 is fixedly installed on the inner walls of both sides of the two second arc-shaped outer shells 902. A second clamping block 907 is fixedly connected to one end of the piston of each of the two fourth hydraulic cylinders 906. The top of the first arc-shaped outer shell 901... A first arc-shaped guide rail 908 and a first arc-shaped gear ring 909 are fixedly connected to the wall. A second arc-shaped guide rail 910 and a second arc-shaped gear ring 911 are fixedly connected to the inner walls of the bottom ends of two second arc-shaped outer shells 902. A slider 912 is slidably connected to the first arc-shaped guide rail 908. A third motor 913 is fixedly mounted on the slider 912. A gear 914 is fixedly connected to one end of the piston of the third motor 913. A welding torch 915 is fixedly mounted on the slider 912 near the third motor 913. When welding pipes, multiple clamping welding mechanisms 9 are transported to directly above multiple pipes via a gantry crane assembly 8, with two welding torches 915 positioned directly above the weld seam between the multiple pipes. Simultaneously, multiple third hydraulic cylinders 904 are activated, thereby pushing the connected... The two second arc-shaped outer shells 902 are opened to facilitate subsequent clamping of the pipe. Under the action of multiple rope lifting mechanisms 81, the corresponding clamping and welding mechanism 9 is driven to move downward. When it moves to the designated height, that is, when the center of the first arc-shaped outer shell 901 and the two second arc-shaped outer shells 902 are aligned with the center of the pipe, the pistons of multiple third hydraulic cylinders 904 retract, thereby driving the two connected second arc-shaped outer shells 902 to close, so that the first arc-shaped guide rail 908 and the two second arc-shaped guide rails 910 close, and the first arc-shaped gear ring 909 and the two second arc-shaped gear rings 911 close. At the same time, the third hydraulic cylinders 904 and multiple fourth hydraulic cylinders 906 are activated, all of which push the connected first clamping blocks through pistons. The first clamping block 905 and the second clamping block 907 simultaneously clamp the outer wall of the pipe, achieving clamping and fixing. Then, the third motor 913 is started, which drives the gear 914 to rotate. The gear 914 meshes and rolls with the first arc-shaped gear ring 909 and the two second arc-shaped gear rings 911, thereby driving the slider 912 to slide on the first arc-shaped guide rail 908 and the two second arc-shaped guide rails 910. This causes the welding torch 915 to move circumferentially around the pipe, achieving circumferential welding of the weld seam. The clamping and welding mechanism 9 located at the top between the first conveying assembly 4 and the second conveying assembly 41, and the clamping and welding mechanism 9 located between the second conveying assembly 41 and the third conveying assembly 42, can clamp and weld the pipe.The remaining clamping and welding mechanisms 9 simply clamp the pipes, thus achieving simultaneous clamping and welding of multiple pipes with high efficiency. In the combined state, the first arc-shaped outer shell 901 and the two second arc-shaped outer shells 902 close into a circle. One end of the piston of the multiple second hydraulic cylinders 903 is rotatably connected to the corresponding second arc-shaped outer shell 902. After welding multiple pipes, the multiple clamping and welding mechanisms 9 maintain the clamping state. Under the action of the gantry crane assembly 8, the welded pipes are hoisted onto multiple fourth conveying assemblies 6. The multiple fourth conveying assemblies 6 then convey the pipes towards the fifth conveying assembly 7. At this time, the subsequently welded pipes are hoisted onto the multiple fourth conveying assemblies 6 through the gantry crane assembly 8. Driven by the multiple fourth conveying assemblies 6, the subsequent pipes are brought into contact with the previously welded pipes end to end. Then, under the action of the gantry crane assembly 8, the clamping welding mechanism close to the first conveying assembly 4 and the second conveying assembly 41 is brought into contact. The connecting mechanism 9 is calibrated to align with the weld seams of the two pipes, and then clamped and welded to achieve re-welding and assembly of the welded pipes. Throughout the process, the gantry crane assembly 8, in conjunction with multiple clamping and welding mechanisms 9, clamps and welds the pipes. After welding, the pipes are directly hoisted and transported, reducing the need for clamp reset steps. This device directly welds the pipes during the clamping process without requiring the clamps to be released, and directly lifts them to the next area via the gantry crane assembly 8, greatly improving overall laying efficiency. In the combined state, the first arc-shaped guide rail 908 and the two second arc-shaped guide rails 910 close into a circle, and the first arc-shaped gear ring 909 and the two second arc-shaped gear rings 911 close into a circle. The gear 914 meshes with the first arc-shaped gear ring 909, enabling the mechanism to clamp not only the pipes during welding but also during hoisting. This improves clamping accuracy during welding and facilitates handling during hoisting, making it highly functional.

[0033] The working principle of this embodiment is as follows: When feeding pipes, multiple pipes are first placed on multiple support arc plates 302. Two first motors 305 are started, thereby driving the corresponding conveyor belt assembly 304 to drive the pipes. When the pipes are transported to the vicinity of the two guide blocks 310, the multiple guide blocks 310 abut against the pipes and prevent slippage. At this time, two second motors 311 are started, thereby driving the connected rotating shaft 307 to rotate, thereby driving the connected sprocket 308 to rotate. The remaining sprockets 308 cooperate to drive multiple chains 309 to drive multiple guide blocks 310 to drive the pipes to be transported to the first conveying assembly 4. Similarly, the other feeding mechanisms 3 operate at the same time, thereby transporting the corresponding pipes to the second conveying assembly 41 and the third conveying assembly 42 respectively. Then, the two first hydraulic cylinders 502 are activated simultaneously, and each pushes the connected push plate 503 through the piston, thereby pushing the pipes that are close to each other, so that the pipes on the first conveying assembly 4 and the third conveying assembly 42 are brought close to the pipes on the second conveying assembly 41 and the ends are fitted together. During pipe welding, multiple clamping welding mechanisms 9 are transported to directly above multiple pipes using a gantry crane assembly 8, with two welding torches 915 positioned directly above the weld seam between the pipes. Simultaneously, multiple third hydraulic cylinders 904 are activated, pushing two connected second arc-shaped housings 902 to open them, facilitating subsequent pipe clamping. Under the action of multiple rope lifting mechanisms 81, the corresponding clamping welding mechanisms 9 move downwards. When they reach a designated height, where the center of the first arc-shaped housing 901 and the two second arc-shaped housings 902 aligns with the center of the pipe, the pistons of the multiple third hydraulic cylinders 904 retract, causing the two connected second arc-shaped housings 902 to close, thus closing the first arc-shaped guide rail 908 and the two second arc-shaped guide rails 910, and the first arc-shaped gear ring 909 and the two second arc-shaped gear rings 911. At the same time, the third hydraulic cylinders 904 and multiple third hydraulic cylinders 904 are activated. Four hydraulic cylinders 906 each push the connected first clamping block 905 and second clamping block 907 through pistons, so that multiple first clamping blocks 905 and multiple second clamping blocks 907 simultaneously clamp the outer wall of the pipe to achieve clamping and fixing. Then, the third motor 913 is started, which drives the gear 914 to rotate, so that the gear 914 meshes and rolls with the first arc-shaped gear ring 909 and the two second arc-shaped gear rings 911, thereby driving the slider 912 to slide on the first arc-shaped guide rail 908 and the two second arc-shaped guide rails 910, thereby driving the welding torch 915 to move in a ring around the pipe to achieve ring welding of the weld. The clamping and welding mechanism 9 located at the top between the first conveying component 4 and the second conveying component 41, and the clamping and welding mechanism 9 located between the second conveying component 41 and the third conveying component 42 can clamp and weld the pipe. The remaining clamping and welding mechanisms 9 simply clamp the pipe, thereby realizing the simultaneous clamping and welding of multiple pipes. After welding multiple pipes, multiple clamping welding mechanisms 9 maintain a clamping state. Under the action of the gantry crane assembly 8, the welded pipes are hoisted onto multiple fourth conveying assemblies 6. The multiple fourth conveying assemblies 6 then convey the pipes towards the fifth conveying assembly 7. At this time, the welded pipes are then hoisted onto the multiple fourth conveying assemblies 6 via the gantry crane assembly 8. Driven by the multiple fourth conveying assemblies 6, the subsequent pipes are brought into contact with the previously welded pipes end to end. Then, under the action of the gantry crane assembly 8, the clamping welding mechanism 9, which is close to the first conveying assembly 4 and the second conveying assembly 41, is aligned with the weld seam of the two pipes. Then, it is clamped and welded, so that the welded pipes can be welded and assembled again. After the pipe is welded to a certain length, it is transported into the sea by the fifth conveying component 7 through the support frame 2. At this time, the support frame 2 can strictly control the bending radius of the pipe to ensure that it is always less than the elastic limit of the material, thus preventing the pipe from undergoing plastic deformation or bending damage.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A deep-water pipelaying vessel for marine engineering construction, comprising a hull (1), characterized in that: A support frame (2) is fixedly installed on one side of the hull (1), and multiple feeding mechanisms (3) are fixedly installed on the top front end of the hull (1). The multiple feeding mechanisms (3) are used to feed pipes. The top of the hull (1) is fixedly installed with a first conveying assembly (4), a second conveying assembly (41) and a third conveying assembly (42) near the rear end of the multiple feeding mechanisms (3), and a pushing mechanism (5) is fixedly installed on the top of the hull (1) near the first conveying assembly (4) and the third conveying assembly (42). The top of the hull (1) is fixedly installed with a fourth conveying component (6) near the rear ends of the first conveying component (4), the second conveying component (41) and the third conveying component (42), respectively. The top of the hull (1) is fixedly installed with a fifth conveying component (7) near the side of the support frame (2). A gantry crane component (8) is installed at the center of the top of the hull (1). The gantry crane component (8) is provided with multiple clamping and welding mechanisms (9).

2. A deep-water pipelaying vessel for marine engineering construction according to claim 1, characterized in that, Multiple roller assemblies (21) are fixedly installed on the support frame (2).

3. A deep-water pipelaying vessel for marine engineering construction according to claim 1, characterized in that, The feeding mechanism (3) includes a support frame (301) fixedly connected to the front end of the hull (1). Multiple support arc plates (302) are fixedly connected to the top of the support frame (301). Two first support shells (303) are fixedly connected to the front end of the support frame (301). A conveyor belt assembly (304) is installed inside each of the two first support shells (303). A first motor (305) is installed on one side of each of the two first support shells (303). The rear end of the support frame (301) is fixedly connected to... There are two second support housings (306), and a set of rotating shafts (307) are rotatably connected inside each of the two second support housings (306). Sprockets (308) are fixedly connected to both ends of the outer walls of the two sets of rotating shafts (307). Multiple sprockets (308) on the two sets of rotating shafts (307) are meshed with chains (309). Multiple guide blocks (310) are fixedly connected to the two chains (309). A second motor (311) is fixedly installed on one side of each of the two second support housings (306).

4. A deep-water pipelaying vessel for marine engineering construction according to claim 3, characterized in that, The two first motors (305) drive the corresponding conveyor belt assemblies (304) respectively, and the output shafts of the two second motors (311) are fixedly connected to the adjacent rotating shafts (307).

5. A deep-water pipelaying vessel for marine engineering construction according to claim 1, characterized in that, The first conveying component (4), the second conveying component (41), the third conveying component (42), the multiple fourth conveying components (6) and the fifth conveying component (7) have the same structure.

6. A deep-water pipelaying vessel for marine engineering construction according to claim 1, characterized in that, The pushing mechanism (5) includes a fixed frame (501) fixedly connected to the top of the hull (1), and a first hydraulic cylinder (502) is fixedly installed on the top of the fixed frame (501). A push plate (503) is fixedly connected to one end of the piston of the first hydraulic cylinder (502).

7. A deep-water pipelaying vessel for marine engineering construction according to claim 1, characterized in that, The gantry hoisting assembly (8) is provided with multiple rope lifting mechanisms (81), and multiple clamping and welding mechanisms (9) are respectively installed at the bottom of the corresponding rope lifting mechanism (81).

8. A deep-water pipelaying vessel for marine engineering construction according to claim 7, characterized in that, The clamping and welding mechanism (9) includes a first arc-shaped outer shell (901) installed at the bottom of the rope lifting mechanism (81). Two second arc-shaped outer shells (902) are rotatably connected to the bottom of the first arc-shaped outer shell (901). Two second hydraulic cylinders (903) are rotatably connected to the outer walls on both sides of the first arc-shaped outer shell (901). Third hydraulic cylinders (904) are fixedly installed on the inner walls on both sides of the first arc-shaped outer shell (901). One end of the piston of each of the multiple third hydraulic cylinders (904) is fixedly connected to a first clamping block (905). Fourth hydraulic cylinders (906) are fixedly installed on the inner walls on both sides of the two second arc-shaped outer shells (902). One end of each piston is fixedly connected to a second clamping block (907). The inner wall of the top of the first arc-shaped outer shell (901) is fixedly connected to a first arc-shaped guide rail (908) and a first arc-shaped gear ring (909). The inner walls of the bottom ends of the two second arc-shaped outer shells (902) are fixedly connected to a second arc-shaped guide rail (910) and a second arc-shaped gear ring (911). A slider (912) is slidably connected on the first arc-shaped guide rail (908). A third motor (913) is fixedly installed on the slider (912). One end of the piston of the third motor (913) is fixedly connected to a gear (914). A welding torch (915) is fixedly installed on the slider (912) near the third motor (913).

9. A deep-water pipelaying vessel for marine engineering construction according to claim 8, characterized in that, In the combined state, the first arc-shaped outer shell (901) and the two second arc-shaped outer shells (902) are closed into a circle, and one end of the piston of the multiple second hydraulic cylinders (903) is rotatably connected to the corresponding second arc-shaped outer shell (902).

10. A deep-water pipelaying vessel for marine engineering construction according to claim 8, characterized in that, In the combined state, the first arc-shaped guide rail (908) and the two second arc-shaped guide rails (910) are joined together to form a circle, the first arc-shaped gear ring (909) and the two second arc-shaped gear rings (911) are joined together to form a circle, and the gear (914) meshes with the first arc-shaped gear ring (909).

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