A marine anchor foundation salvage migration structure and migration method

Abstract

A structure and method for salvaging and relocating marine anchorage foundations are disclosed. The structure includes a powered floating barge and at least one set of synchronous lifting components installed on its deck. Each component consists of a synchronous hydraulic control device, a laterally arranged traction rail, a hydraulic telescopic rod, a traction block slidably mounted on the traction rail, and a polymer cable. The method includes: in the connection step, pushing the traction block to the side of the barge and connecting it to the anchorage foundation; in the lifting step, retracting the hydraulic telescopic rod towards the centerline and horizontally pulling the anchorage foundation away from the seabed via the cable; in the transportation step, towing the anchorage foundation suspended underwater to the target location by the powered floating barge; and in the release step, extending the hydraulic telescopic rod to the side of the barge and lowering the anchorage foundation to the seabed. This invention utilizes seawater buoyancy to reduce the lifting load, eliminates the need for large crane vessels, is low-cost, provides stable operation, and enables precise underwater relocation and reuse of large-tonnage anchorage foundations.

Description

Technical Field

[0001] This invention relates to the field of underwater salvage and relocation technology, and in particular to a marine anchoring foundation salvage and relocation structure and method. Background Technology

[0002] Marine anchoring foundations are part of the underwater mooring system used on large offshore platforms. These platforms are moored on anchoring foundations, which are typically made of reinforced concrete and can weigh thousands of tons. When an offshore platform is relocated and repositioned, the anchoring foundations still need to be installed and positioned to withstand the effects of typhoons, cold waves, and other strong winds and waves. There are two approaches: one is to construct a new anchoring foundation weighing thousands of tons, and the other is to relocate the existing anchoring foundation to a new location for reuse. Obviously, the second approach can significantly reduce costs. However, relocating the existing anchoring foundation using large offshore lifting equipment to lift it to the sea surface is extremely costly. Summary of the Invention

[0003] To address the shortcomings of existing production technologies, this applicant provides a marine anchor foundation salvage and relocation structure and method, effectively solving the problem of underwater lifting and relocation transportation of marine anchor foundations. Its main advantages are that it eliminates the need to lift the anchor foundation to the sea surface, fully utilizing the buoyancy of seawater on the anchor foundation, significantly reducing the force on the hydraulic mechanism, eliminating the need for large offshore cranes, and requiring only the installation of a synchronous lifting device on a powered floating barge to achieve underwater lifting and relocation transportation of the marine anchor foundation. This also significantly reduces costs and facilitates the relocation and positioning of large marine floating structure anchor foundations.

[0004] The technical solution adopted in this invention is as follows: A marine anchoring foundation salvage and relocation structure includes a powered floating barge as the carrier for salvage and relocation; it also includes at least one set of synchronous lifting components installed on the deck of the powered floating barge. Each synchronous lifting component comprises a synchronous hydraulic control device and a traction rail. The synchronous hydraulic control device is fixedly installed on the longitudinal central axis of the powered floating barge, and the traction rail is arranged transversely along the powered floating barge and symmetrically distributed on the left and right sides of the synchronous hydraulic control device. The output end of the synchronous hydraulic control device is connected to a hydraulic telescopic rod, and a traction block is slidably connected to the traction rail, with the traction block connected to the telescopic end of the hydraulic telescopic rod. It also includes a polymer cable, one end of which is connected to the traction block, and the other end of which is used to connect to the anchoring foundation. The synchronous hydraulic control device drives the hydraulic telescopic rod to extend and retract, causing the traction block to slide on the traction track toward the centerline or side of the powered floating barge. This allows the polymer cable to pull and anchor the foundation horizontally, enabling the barge to be lifted off the seabed or lowered to the seabed.

[0005] Its further technical solution lies in: Multiple synchronous lifting components are arranged at intervals along the longitudinal centerline of the powered floating barge.

[0006] It also includes a guide cable brake device, which is installed on the side of the powered floating barge to guide and lock the polymer cable.

[0007] The traction rail adopts an embedded chute structure, with the traction block embedded in the chute to prevent derailment.

[0008] A method for relocating a marine anchored foundation salvage and relocation structure includes the following operational procedures: First, the connection process: connect one end of the polymer cable to the anchoring foundation, and control the hydraulic telescopic rod to extend and push the traction block to the side of the powered floating barge; Then, the lifting process: control the synchronous hydraulic control device to retract the hydraulic telescopic rod towards the central axis of the powered floating barge, driving the traction block and the polymer cable to slide inward synchronously, thereby lifting the anchoring foundation from the seabed and removing it from the seabed; Secondly, the transportation process: the anchored foundation, which is suspended underwater, is towed by a powered floating barge to the target location; Finally, the release process: at the target location, the hydraulic telescopic rod is extended to the side of the ship, driving the traction block and the polymer cable to move outward synchronously, and the anchoring foundation is lowered to the designated position on the seabed.

[0009] As a further improvement to the above technical solution: During the lifting process, the anchoring foundation remains completely submerged in seawater, using the buoyancy of the seawater to support most of its weight.

[0010] After the lifting process is completed, the polymer cable is locked by the guide cable brake device to maintain the suspension state of the anchor foundation.

[0011] During transport, the powered floating barge travels at a speed below the critical speed to maintain the stability of the anchoring foundation underwater.

[0012] During the release process, multiple hydraulic telescopic rods are extended synchronously by a synchronous hydraulic control device to ensure that the anchoring foundation is lowered smoothly.

[0013] The anchoring foundation is a reinforced concrete structure, and its weight is balanced by the buoyancy of the powered floating barge, the buoyancy of the seawater on the anchoring foundation, and the tension of the hydraulic telescopic rod.

[0014] The beneficial effects of this invention are as follows: (1) This invention significantly reduces the lifting load and avoids the use of large lifting equipment: Throughout the lifting, towing, and lowering process, the anchoring foundation remains submerged in seawater, fully utilizing the buoyancy of the water to offset most of its weight. The hydraulic telescopic boom only needs to overcome the underwater weight of the anchoring foundation (approximately 1 / 3 to 1 / 2 of its weight in air), without needing to lift it out of the water. Therefore, there is no need to rent ultra-large floating crane vessels; the operation can be completed using only a conventional powered floating barge with a hydraulic synchronization system, significantly reducing equipment costs and operating expenses.

[0015] (2) The present invention has a simple structure and is easy to modify on existing ships: The synchronous hydraulic control device, traction rail, hydraulic telescopic rod, traction block, and polymer cable are all arranged on the deck of the powered floating barge, featuring a high degree of modularity and convenient installation. The traction rail is arranged laterally, and the traction block slides internally, resulting in a compact structure that does not occupy excessive deck space and can be flexibly arranged on various types of powered barges.

[0016] (3) The lifting and lowering process of this invention is stable and safe: Multiple hydraulic telescopic booms are driven to extend and retract synchronously by a synchronous hydraulic control device, ensuring consistent displacement of the traction blocks on both sides. This guarantees a stable anchorage foundation during lifting and lowering, preventing uneven cable tension or rollover and collision with the hull due to off-center loading. A guide cable brake device can lock the polymer cable during transport, keeping the anchorage foundation stably suspended at a set depth.

[0017] (4) The transportation process of this invention is less affected by sea conditions: Anchoring foundations at a certain depth underwater can effectively avoid the direct impact of wind and waves on the sea surface. During transportation, the stability requirements for the powered floating barge are lower, and the operation window is longer, making it particularly suitable for sea areas with frequent severe sea conditions.

[0018] (5) The present invention has precise positioning, meeting engineering requirements: By utilizing the DP positioning or mooring positioning system of a powered floating barge, and in conjunction with the precise stroke control of a hydraulic telescopic boom, the anchoring foundation can be lowered to the designated coordinates of the target location with high positioning accuracy, meeting the mooring system installation requirements of new offshore platform sites.

[0019] (6) This invention is economical, environmentally friendly, and reusable: This enables in-situ salvage and off-site reuse of anchorage foundations, avoiding the large amount of reinforced concrete, steel, and construction energy consumption required for new anchorage foundations, significantly reducing the carbon footprint, and meeting the requirements of green development in marine engineering.

[0020] In summary, this invention solves the problems of high cost and stringent equipment requirements for underwater relocation of large-tonnage marine anchoring foundations, and has significant economic benefits and practical engineering value. Attached Figure Description

[0021] Figure 1 This is a top view schematic diagram of the marine anchoring foundation salvage and relocation structure provided by the present invention.

[0022] Figure 2 This is a side view schematic diagram of the marine anchoring foundation salvage and relocation structure provided by the present invention.

[0023] Figure 3 This is a schematic diagram of the anchoring foundation being lifted and detached from the seabed in this invention.

[0024] Figure 4 This is a schematic diagram of the cooperation between the traction block and the traction track in this invention.

[0025] The components include: 1. Powered floating barge; 2. Synchronous hydraulic control device; 3. Hydraulic telescopic rod; 4. Traction block; 5. Traction rail; 6. Polymer cable; 7. Cable guide brake device; and 8. Anchoring foundation. Detailed Implementation

[0026] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] like Figures 1-4 As shown, the marine anchoring foundation salvage and relocation structure of this embodiment includes a powered floating barge 1, which serves as the carrier for salvage and relocation; it also includes at least one set of synchronous lifting components, installed on the deck of the powered floating barge 1. The structure of each synchronous lifting component is as follows: it includes a synchronous hydraulic control device 2 and a traction rail 5. The synchronous hydraulic control device 2 is fixedly installed on the longitudinal central axis of the powered floating barge 1. The traction rail 5 is arranged transversely along the powered floating barge 1 and symmetrically distributed on the left and right sides of the synchronous hydraulic control device 2. The output end of the synchronous hydraulic control device 2 is connected to a hydraulic telescopic rod 3. A traction block 4 is slidably connected on the traction rail 5. The traction block 4 is connected to the telescopic end of the hydraulic telescopic rod 3. It also includes a polymer cable 6. One end of the polymer cable 6 is connected to the traction block 4, and the other end of the polymer cable 6 is used to connect to the anchoring foundation 8. The synchronous hydraulic control device 2 drives the hydraulic telescopic rod 3 to extend and retract, causing the traction block 4 to slide on the traction rail 5 toward the central axis or side of the powered floating barge 1, thereby pulling the anchor foundation 8 in the horizontal direction through the polymer cable 6, so that it can be lifted off the seabed or lowered to the seabed.

[0028] Multiple synchronous lifting components are arranged at intervals along the longitudinal centerline of the powered floating barge 1.

[0029] It also includes a cable guide brake device 7, which is installed on the side of the powered floating barge 1 and is used to guide and lock the polymer cable 6.

[0030] The traction track 5 adopts an embedded slide groove structure, and the traction block 4 is embedded in the slide groove to prevent derailment.

[0031] The relocation method for the marine anchoring foundation salvage and relocation structure in this embodiment includes the following operation process: First, the connection process: connect one end of the polymer cable 6 to the anchoring base 8, and control the hydraulic telescopic rod 3 to extend, pushing the traction block 4 to the side of the powered floating barge 1; Then, the lifting process: control the synchronous hydraulic control device 2 to make the hydraulic telescopic rod 3 retract towards the central axis of the power floating barge 1, driving the traction block 4 and the polymer cable 6 to slide inward synchronously, thereby lifting the anchor foundation 8 from the seabed and making it detach from the seabed. Secondly, the transportation process: the anchored foundation 8, which is in a floating state underwater, is towed by the powered floating barge 1 to the target location; Finally, the release process: at the target location, the hydraulic telescopic rod 3 is extended to the side of the ship, which drives the traction block 4 and the polymer cable 6 to move outward synchronously, and the anchoring foundation 8 is lowered to the designated position on the seabed.

[0032] During the lifting process, the anchoring foundation 8 remains completely submerged in seawater, using the buoyancy of the seawater to support most of its weight.

[0033] After the lifting process is completed, the polymer cable 6 is locked by the guide cable brake device 7 to maintain the suspension state of the anchor foundation 8.

[0034] During transportation, the powered floating barge 1 travels at a speed below the critical speed to maintain the stability of the anchoring foundation 8 underwater.

[0035] During the release process, multiple hydraulic telescopic rods 3 are extended synchronously by the synchronous hydraulic control device 2 to ensure that the anchor foundation 8 is lowered smoothly.

[0036] The anchoring foundation 8 is a reinforced concrete structure. The weight of the anchoring foundation 8 is balanced by the buoyancy of the dynamic floating barge 1, the buoyancy of the seawater on the anchoring foundation 8, and the tension of the hydraulic telescopic rod 3.

[0037] The marine anchoring foundation salvage and relocation structure described in this invention has the following specific structural composition, connection relationships, and functions: The salvage and relocation synchronous lifting device is mounted on a powered floating barge 1 and consists of a synchronous hydraulic control device 2, a hydraulic telescopic boom 3, a traction block 4, a traction rail 5, a polymer cable 6, and a guide cable brake device 7. The synchronous hydraulic control device 2 lifts the anchored foundation 8 off the seabed by pulling the hydraulic telescopic boom 3, the traction block 4, and the polymer cable 6. After the powered floating barge 1 tows the underwater anchored foundation 8 to its destination, the synchronous hydraulic control device 2 and the hydraulic telescopic boom 3 release the anchored foundation 8 to the designated location.

[0038] The powered floating barge 1 serves as the carrier for salvage, lifting, and transportation of the marine anchoring foundation 8. The synchronous hydraulic control device 2 is installed on the longitudinal centerline deck of the powered floating barge 1, and multiple synchronous hydraulic control devices 2 can be arranged along the centerline of the powered floating barge 1.

[0039] The traction rail 5 is arranged laterally along the powered floating barge 1. The traction rail 5 is distributed on the left and right sides of the central axis where the synchronous hydraulic control device 2 is located. The traction block 4 can slide on the traction rail 5 through the hydraulic telescopic rod 3.

[0040] One end of the polymer cable 6 is connected to the traction block 4, and the other end is connected to the anchoring foundation 8. When the traction block 4 slides on the traction rail 5, the polymer cable 6 also slides with the traction block 4, lifting the anchoring foundation 8 off the seabed or releasing it to the seabed, where it is locked by the cable guide brake device 7.

[0041] The operation is divided into three stages. In the first stage, one end of the polymer cables 6 on both sides of the powered floating barge 1 is connected to the anchorage foundation 8. At this time, the hydraulic telescopic rod 3 pushes the traction block 4 to the port and starboard sides of the powered floating barge 1. In the second stage, the synchronous hydraulic control device 2 controls the hydraulic telescopic rod 3 to retract towards the centerline of the powered floating barge 1. The traction block 4 and the polymer cables 6 also retract synchronously, and the marine anchorage foundation 8 is lifted off the seabed. The guide cable brake device 7 locks the polymer cables 6. In the third stage, the powered floating barge 1 transports the marine anchorage foundation 8 to its destination.

[0042] The working principle of this embodiment is as follows: The displacement of the synchronous hydraulic device pulls the polymer cable 6, lifting the anchor foundation 8 off the seabed. The anchor foundation 8, which is underwater, is transported by the powered floating barge 1. After reaching the designated position, the anchor foundation 8 is smoothly released by the synchronous hydraulic device.

[0043] The specific work process is as follows: Step 1: Connection and initial positioning.

[0044] The work vessel connects the end of the polymer cable 6 to the hoisting point on the anchoring foundation 8 submerged on the seabed. At this time, the synchronous hydraulic control device 2 drives the hydraulic telescopic rod 3 to extend fully, pushing the traction block 4 to the outermost end of the traction rail 5 (i.e., close to the port and starboard sides of the powered floating barge 1). The polymer cable 6 is then in a near-vertical state.

[0045] Step 2: Underwater lifting.

[0046] The synchronous hydraulic control device 2 is activated, driving the hydraulic telescopic rod 3 to retract smoothly towards the central axis of the powered floating barge 1. The traction block 4 moves the upper end of the polymer cable 6 inward, changing the inclination angle of the polymer cable 6. Its vertical component force slowly pulls the anchoring foundation 8 up from the seabed. As the hydraulic telescopic rod 3 continues to retract to the set position, the anchoring foundation 8 completely detaches from the seabed, as...Figure 3 As shown. At this time, the guide cable brake device 7 locks the polymer cable 6, and the anchoring foundation 8 is stably suspended at a certain depth underwater. During this process, since the anchoring foundation 8 is always submerged in water, its underwater weight is much less than its weight in air, and the load on the hydraulic system is small.

[0047] Step 3: Underwater towing.

[0048] The powered floating barge 1 starts its main engine and tows the anchoring base 8, which is suspended underwater, at a set safe speed towards the target sea area. During the voyage, the anchoring base 8 can be kept stable by adjusting its speed and course, preventing it from hitting the bottom or swaying excessively.

[0049] Step 4: Precise Deployment.

[0050] Upon reaching the designated coordinates of the target location, the powered floating barge 1 decelerates and positions itself. First, the locking of the guide cable brake device 7 is released, and then the synchronous hydraulic control device 2 drives the hydraulic telescopic rod 3 to extend outward (towards the hull side) synchronously. The traction block 4 moves the polymer cable 6 outward, and the anchoring foundation 8 is smoothly lowered to the seabed under its own weight. By controlling the extension speed and stroke of the hydraulic telescopic rod 3, the precise positioning of the anchoring foundation 8 on the seabed can be achieved.

[0051] Finally, the workers disconnected the polymer cable 6 from the anchoring foundation 8, completing the entire salvage and relocation operation.

[0052] This embodiment enables underwater lifting and relocation of the marine anchoring foundation 8 without raising the large-tonnage anchoring foundation 8 to the sea surface. It makes full use of the buoyancy of seawater on the anchoring foundation 8, solves the problem of salvage and relocation of large-tonnage marine anchoring foundation 8, and helps to relocate and position large marine floating structure anchoring foundation 8, saving costs.

[0053] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A marine anchoring foundation salvage and relocation structure, characterized in that: The system includes a powered floating barge (1) used as a carrier for salvage and relocation; it also includes at least one set of synchronous lifting components installed on the deck of the powered floating barge (1). The structure of each set of synchronous lifting components is as follows: it includes a synchronous hydraulic control device (2) and a traction rail (5). The synchronous hydraulic control device (2) is fixedly installed on the longitudinal central axis of the powered floating barge (1). The traction rail (5) is arranged transversely along the powered floating barge (1) and symmetrically distributed on the left and right sides of the synchronous hydraulic control device (2). The output end of the synchronous hydraulic control device (2) is connected to a hydraulic telescopic rod (3). A traction block (4) is slidably connected on the traction rail (5). The traction block (4) is connected to the telescopic end of the hydraulic telescopic rod (3). The system also includes a polymer cable (6). One end of the polymer cable (6) is connected to the traction block (4), and the other end of the polymer cable (6) is used to connect to the anchoring foundation (8). The synchronous hydraulic control device (2) drives the hydraulic telescopic rod (3) to extend and retract, thereby causing the traction block (4) to slide on the traction rail (5) toward the central axis or side of the powered floating barge (1), thereby pulling the anchor foundation (8) in the horizontal direction through the polymer cable (6), so that it is lifted off the seabed or lowered to the seabed.

2. The marine anchoring foundation salvage and relocation structure as described in claim 1, characterized in that: Multiple synchronous lifting components are arranged at intervals along the longitudinal central axis of the powered floating barge (1).

3. The marine anchoring foundation salvage and relocation structure as described in claim 1, characterized in that: It also includes a cable brake device (7), which is installed on the side of the powered floating barge (1) to guide and lock the polymer cable (6).

4. The marine anchoring foundation salvage and relocation structure as described in claim 1, characterized in that: The traction rail (5) adopts an embedded chute structure, and the traction block (4) is embedded in the chute to prevent derailment.

5. A method for relocating a marine anchoring foundation salvage and relocation structure as described in claim 1, characterized in that: The following operational procedures are included: First, the connection process: connect one end of the polymer cable (6) to the anchoring base (8), and control the hydraulic telescopic rod (3) to extend, pushing the traction block (4) to the side of the powered floating barge (1); Then, the lifting process: control the synchronous hydraulic control device (2) to make the hydraulic telescopic rod (3) retract towards the central axis of the power floating barge (1), drive the traction block (4) and the polymer cable (6) to slide inward synchronously, thereby lifting the anchor foundation (8) from the seabed and making it detach from the seabed; Secondly, the transportation process: the anchoring foundation (8) which is in a state of underwater suspension is towed by the powered floating barge (1) to the target location; Finally, the release process: at the target location, the hydraulic telescopic rod (3) is controlled to extend to the side of the ship, driving the traction block (4) and the polymer cable (6) to move outward synchronously, and the anchoring foundation (8) is lowered to the designated position on the seabed.

6. The migration method as described in claim 5, characterized in that: During the lifting process, the anchoring foundation (8) is always completely submerged in seawater, using the buoyancy of seawater to support most of its weight.

7. The migration method as described in claim 5, characterized in that: After the lifting process is completed, the polymer cable (6) is locked by the guide cable brake device (7) to maintain the suspension state of the anchor foundation (8).

8. The migration method as described in claim 5, characterized in that: During transport, the powered floating barge (1) sails at a speed below the critical speed to maintain the stability of the anchoring foundation (8) underwater.

9. The migration method as described in claim 5, characterized in that: During the release process, multiple hydraulic telescopic rods (3) are controlled to extend synchronously by the synchronous hydraulic control device (2) to ensure that the anchor foundation (8) is lowered smoothly.

10. The migration method as described in claim 5, characterized in that: The anchoring foundation (8) is a reinforced concrete structure. The weight of the anchoring foundation (8) is balanced by the buoyancy of the dynamic floating barge (1), the buoyancy of the seawater on the anchoring foundation (8), and the tension of the hydraulic telescopic rod (3).

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