A prestressed vehicle-spoke cable truss offshore floating platform

Abstract

The present invention relates to a prestressed spoke-type cable truss offshore floating platform, which comprises a platform main body and a tension leg mooring system. The tension leg mooring system is connected to the platform main body. The platform main body includes a rigid frame, prestressed cables and a main floating body. The rigid frame includes support rods and vertical rods. The support rods are annular. The main floating body is arranged on the vertical rods. The prestressed cables include first stay cables and second stay cables. The first stay cables are respectively connected to the support rods and the tops of the vertical rods, and the second stay cables are respectively connected to the support rods and the bottoms of the vertical rods. The prestressed spoke-type cable truss offshore floating platform of the present invention uses less manufacturing materials, has a smaller weight and a shorter manufacturing cycle; its structure has reasonable stress, stress dispersion and is not easily damaged; the range of selectable materials is relatively wide, the manufacturing cost is reduced, and it can be installed integrally during installation, with small workload, short time and good economy.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore floating platforms, and particularly to a prestressed spoke-type cable truss offshore floating platform. Background Art

[0002] Offshore floating platforms are usually used in applications such as offshore wind power generation. At present, according to different sea conditions and geological conditions, various types of floating foundations have emerged in the design of floating foundations. Offshore wind power floating foundations can generally be divided into three categories: cylindrical, semi-submersible, and tension leg type. However, the existing floating platforms have the following defects: 1. The manufacturing difficulty is relatively large, the material consumption is relatively large, the part size specifications are numerous, the manufacturing efficiency is low, and there are many material restrictions, resulting in poor overall manufacturing economy; 2. The load is not evenly distributed, stress concentration occurs, the load rationality is poor, it is vulnerable to damage, the anti-overturning moment is small, and it is easy to capsize; 3. The hydrodynamic performance is poor, the waterplane area is large, and the center of gravity is relatively high; 4. When installing, wet towing or dry towing at sea is adopted, which requires offshore hoisting, with many processes, a complex installation environment, low installation efficiency, and high costs. Summary of the Invention

[0003] In order to solve the problems of the prior art, the present invention provides a prestressed spoke-type cable truss offshore floating platform that is easy to manufacture, has a relatively low cost, a more stable structure, a small waterplane area, is not easy to capsize, and is convenient to install.

[0004] The specific technical solution is as follows: A prestressed spoke-type cable truss offshore floating platform includes a platform main body and a tension leg mooring system. The tension leg mooring system is connected to the platform main body. The platform main body includes a rigid frame, prestressed cables, and a main floating body. The rigid frame includes support rods and vertical rods. The support rods are annular. The main floating body is arranged on the vertical rods. The prestressed cables include first stay cables and second stay cables. The first stay cables are respectively connected to the support rods and the top of the vertical rods. The second stay cables are respectively connected to the support rods and the bottom of the vertical rods.

[0005] The following are the subsidiary technical solutions of the present invention.

[0006] As a preferred solution, the tension leg mooring system includes a first fixed pulley, a pulley block, an anchor body, and a cable. The first fixed pulley is arranged on the anchor body. The pulley block is arranged on the platform main body. The cable is threaded through the first fixed pulley and the pulley block.

[0007] As a preferred solution, the pulley block is arranged on the support rods. Multiple groups of pulley blocks are arranged on the support rods, and the multiple groups of pulley blocks are arranged at equal intervals.

[0008] As a preferred solution, each group of pulley blocks has two second fixed pulleys.

[0009] As a preferred solution, there is one cable, and the cable sequentially passes through the first fixed pulley and the second fixed pulley.

[0010] As a preferred solution, the tension leg mooring system includes a winch, with one end of a cable disposed on the winch and the other end fixed to the platform main body.

[0011] As a preferred solution, the tension leg mooring system includes a locking device, which is disposed on the support rod.

[0012] As a preferred solution, the locking device includes a pressing plate and a bolt. The pressing plate presses the cable, and the bolt passes through the pressing plate and is locked on the support rod.

[0013] As a preferred solution, the platform main body includes an additional floating body, which is connected to the support rod.

[0014] Technical effects of the present invention: For a prestressed spoke-type cable truss offshore floating platform of the present invention, the amount of manufacturing materials used is less, the weight is smaller, and the manufacturing cycle is shorter; at the same time, its structure is reasonably stressed, the stress is dispersed, and it is not easily damaged; in addition, the range of material selection is relatively wide, the manufacturing cost is reduced, and it can be installed integrally during installation, with small workload, short time, and good economy. Description of the Drawings

[0015] Figure 1 is a schematic diagram of a prestressed spoke-type cable truss offshore floating platform according to an embodiment of the present invention.

[0016] Figure 2 is a top view of a prestressed spoke-type cable truss offshore floating platform according to an embodiment of the present invention.

[0017] Figure 3 is a schematic diagram of a tension leg mooring system according to an embodiment of the present invention.

[0018] Figure 4 is a schematic diagram of a locking device according to an embodiment of the present invention. Detailed Embodiments

[0019] Next, the substantial features and advantages of the present invention will be further described in conjunction with examples, but the present invention is not limited to the listed embodiments.

[0020] Such as Figures 1 to 4As shown in the figure, a prestressed spoke-type cable truss offshore floating platform in this embodiment includes a platform main body 1 and a tension leg mooring system 2. The tension leg mooring system 2 is connected to the platform main body 1. The platform main body 1 includes a rigid frame 11, prestressed cables 12, and a main floating body 13. The rigid frame 11 includes support rods 111 and vertical rods 112. The support rods 111 are annular. The main floating body 13 is arranged on the vertical rods 112. The prestressed cables 12 include first stay cables 121 and second stay cables 122. The first stay cables 121 are respectively connected to the support rods 111 and the tops of the vertical rods 112. The second stay cables 122 are respectively connected to the support rods 111 and the bottoms of the vertical rods 112. In the above technical solution, the support rods, vertical rods, and prestressed cables form a spoke-type cable truss structure. The spoke-type cable truss structure has the following advantages: (1) It can increase the span of the platform main body, with a long lever arm and a large anti-overturning moment; (2) The stress is uniform and dispersed, the stress is dispersed, and the structure has a long service life; (3) Less material is used and the self-weight is light; (4) The volume and weight of the components are small, which is easy to manufacture, transport, and assemble; (5) The repetition rate of the component specifications is high, and it can be mass-produced repeatedly, with high manufacturing efficiency and low cost; (6) The selection range of structural materials is expanded, which is conducive to different materials to play their performance; (7) It can be installed integrally during installation, with less workload, short time, and good economy; (8) It has a shallow draft and high initial stability, and does not require large equipment for auxiliary installation; (9) It is convenient to move as a whole, and the economy of overhaul and repeated installation is good. In this embodiment, the prestressed cable refers to a stay cable with prestress.

[0021] In this embodiment, the tension leg mooring system 2 includes a first fixed pulley 3, a pulley block 4, an anchor body 5, and a cable 6. The first fixed pulley 3 is arranged on the anchor body 5. The pulley block 4 is arranged on the platform main body 1. The cable 6 is threaded through the first fixed pulley and the pulley block. In the above technical solution, the platform main body can be connected to the anchor body through the cable. When the cable is tensioned, the upper frame of the rigid frame is exposed above the water surface. The vertical cable between the first fixed pulley 3 and the pulley block 4 is parallel and perpendicular to the horizontal plane. By adopting the tension leg mooring system, the rotation of the platform main body can be reduced. When the sea current is inconsistent with the wind direction, the working frequency of the fan active yaw system can be reduced, thereby increasing the service life of the yaw system. In addition, by adjusting the cable, the distance between the anchor body and the floating platform can be adjusted, and the floating platform can dive into the water.

[0022] In this embodiment, the pulley block 4 is arranged on the support rod 111. Multiple groups of pulley blocks are arranged on the support rod 111 at equal intervals.

[0023] In this embodiment, each group of pulley blocks 4 has two second fixed pulleys 41, so that the cable can change direction and is arranged around the support rod.

[0024] In this embodiment, there is one cable 6, and the cable 6 passes through the first fixed pulley 3 and the second fixed pulley 41 in sequence. Thus, the lifting of the platform main body can be adjusted by one cable. After the cable is threaded, multiple cable segments are formed in the vertical direction, and the cable segments are parallel to each other.

[0025] In this embodiment, the tension leg mooring system includes a winch 7. One end of the cable is set on the winch 7, and the other end is fixed on the platform main body. The winch can be used to take in and pay out the cable, thereby adjusting the position of the platform main body.

[0026] In this embodiment, the tension leg mooring system includes a locking device 8, and the locking device 8 is arranged on the support rod 111. Because there is no automatic tension balance mechanism and most of the loads come from the moment arm formed by the wind force, it is easy for the length of the tension leg to change and cause shaking. After the cable is tensioned in place, the locking device locks the cables on each anchor body to prevent them from sliding, thus preventing the change of the tension leg length.

[0027] In this embodiment, the locking device 8 includes a pressing plate 81 and a bolt 82. The pressing plate 81 presses the cable 6, and the bolt passes through the pressing plate and is locked on the support rod 111. In the above technical solution, the cable can be positioned by the pressing plate, and the pressing plate is fixed by the bolt.

[0028] In this embodiment, the platform main body includes an additional floating body 9, and the additional floating body 9 is connected to the support rod 111. When the floating platform needs to be moved and transported, due to the buoyancy generated by the additional floating body, the total buoyancy of the additional floating body and the main floating body is greater than the gravity of the anchor body, so that the floating platform floats, and thus it can be transported. When the floating platform reaches the designated position, the additional floating body is removed. Since the gravity of the anchor body is greater than that of the main floating body, the floating platform dives until the anchor body reaches the seabed.

[0029] In this embodiment, by adopting a tension leg mooring system with a single cable and multiple anchors, the following advantages are achieved: (1) Each anchor body is small, easy to manufacture, and has a low cost; (2) The mooring system has a high rigidity and high stability; (3) The mooring system occupies a small sea area; (4) It can be assembled on the shore and towed as a whole, with high assembly efficiency and low cost.

[0030] The amount of manufacturing materials used in a prestressed spoke-type cable truss offshore floating platform in this embodiment is less, the weight is smaller, and the manufacturing cycle is shorter; at the same time, its structure is reasonably stressed, the stress is dispersed, and it is not easy to be damaged; in addition, its waterplane area is small, it is less affected by tidal differences and waves, the range of material selection is relatively wide, the manufacturing cost is reduced, and it can be installed as a whole during installation, with a small workload, short time, and good economy.

[0031] It should be noted that the above-mentioned preferred embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A prestressed spoke-type cable truss offshore floating platform, characterized in that It includes a platform main body and a tension leg mooring system. The tension leg mooring system is connected to the platform main body. The platform main body includes a rigid frame, prestressed cables, and a main floating body. The rigid frame includes support rods and vertical rods. The support rods are annular. The main floating body is arranged on the vertical rods. The prestressed cables include first stay cables and second stay cables. The first stay cables are respectively connected to the support rods and the top of the vertical rods. The second stay cables are respectively connected to the support rods and the bottom of the vertical rods. The tension leg mooring system includes a first fixed pulley, a pulley block, an anchor body, and a cable. The first fixed pulley is arranged on the anchor body. The pulley block is arranged on the platform main body. The cable is threaded through the first fixed pulley and the pulley block. The pulley block is arranged on the support rod. Multiple groups of pulley blocks are arranged on the support rod. The multiple groups of pulley blocks are arranged at equal intervals. Each group of pulley blocks has two second fixed pulleys. There is one cable. The cable passes through the first fixed pulley and the second fixed pulley in sequence. The tension leg mooring system includes a winch. One end of the cable is arranged on the winch, and the other end is fixed on the platform main body. The tension leg mooring system includes a locking device. The locking device is arranged on the support rod. The locking device includes a pressing plate and a bolt. The pressing plate presses the cable, and the bolt passes through the pressing plate and is locked on the support rod. The platform main body includes an additional floating body. The additional floating body is connected to the support rod. When the floating platform needs to be moved and transported, due to the buoyancy generated by the additional floating body, the sum of the buoyancies of the additional floating body and the main floating body is greater than the gravity of the anchor body, so that the floating platform floats. When the floating platform reaches the designated position, the additional floating body is removed. Since the gravity of the anchor body is greater than that of the main floating body, the floating platform dives until the anchor body reaches the seabed.

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