Anchor point split assembly type anchor foundation and tension leg platform

Abstract

The present invention discloses an anchor-type split assembly type anchor foundation and a tension leg platform, wherein the tension leg platform comprises a pile foundation, the pile foundation comprises a first base and a second base connected to each other, the first base is used to be inserted into the ground, and the second base is set as a hollow structure, and the anchor-type split assembly type anchor foundation also comprises an anchor device, the anchor device is sleeved on the outer wall of the second base, and the inner wall of the anchor device is provided with a shear key. The anchor-type split assembly type anchor foundation utilizes the first base to be driven into the soil, and then the second base is set as a hollow structure, and the reinforcement performed by the anchor device can greatly improve the overall stiffness and strength of the single pile foundation, improve the whole machine frequency of the wind turbine, improve the comprehensive bearing performance of the wind turbine foundation, and make the large-diameter single pile suitable for deeper water depths and more complex marine environments. In addition, by arranging shear keys on the inner wall of the anchor device, the ability of the deep-water floating wind power platform to resist environmental loads is further improved.

Description

Technical Field

[0001] The present invention belongs to the field of floating offshore wind power engineering, and in particular relates to an anchor point type split assembly type anchor foundation and a tension leg platform. Background Art

[0002] The tension leg platform is a typical deep-water floating platform, referred to as TLP (Tension Leg Platform), which is generally composed of four parts: the upper module, the central column, the tension leg system, and the bottom foundation. This type of platform is connected to the anchoring equipment on the seabed through tension tendons. It is usually suitable for wind farms with a water depth greater than 60m. It is the most advantageous platform form for my country's wind power development to go deep sea at the current stage of development. However, the existing bottom foundation is usually a single pile all-steel structure with large structural flexibility. Under deep water conditions, the single pile foundation of the all-steel structure has large deformation and low frequency of the whole machine, which cannot meet the design requirements. Due to its low strength and low stiffness, it is very easy to cause local buckling under typhoon conditions, or cause fatigue and damage to the wind turbine single pile foundation under long-term cyclic loads. In addition, for muddy geological conditions, the all-steel structure of the single pile is difficult to resist environmental loads. Therefore, the current all-steel structure of the single pile foundation is difficult to apply to sea areas with a water depth of more than 40 meters.

[0003] Therefore, there is an urgent need to design an anchor-type split assembly type anchor foundation that is suitable for deep sea areas and improves the ability of deep-water floating wind power platforms to resist environmental loads. Summary of the invention

[0004] In order to solve the technical problem mentioned in the background technology that the existing single pile structure is difficult to apply to deep sea areas, an anchor point split assembly type anchor foundation and a tension leg platform are provided to solve the problem of improving the ability of deep-water floating wind power platforms to resist environmental loads.

[0005] To achieve the above purpose, the specific technical scheme of an anchor point split assembly type anchor foundation and a tension leg platform of the present invention is as follows: An anchor point type split assembly type anchor foundation includes a pile foundation, the pile foundation includes a first base and a second base connected to each other, the first base is used to be inserted into the ground, and the second base is set as a hollow structure. The anchor point type split assembly type anchor foundation also includes an anchor device, the anchor device is sleeved on the outer wall of the second base, and a shear key is set on the inner wall of the anchor device.

[0006] Furthermore, the outer wall of the second matrix is ​​also provided with a shear key, and the space between the second matrix and the anchoring device is completely filled with grouting material.

[0007] Furthermore, the shape of the anchoring device is set to be concave, and the concave part of the anchoring device is sleeved on the outer wall of the second substrate.

[0008] Furthermore, a lifting lug is provided on the top of the outer wall of the concave anchoring device, and a rope hole is provided on the lifting lug for connection with other devices.

[0009] Furthermore, an outer side wall of the anchoring device is provided with an anchor point.

[0010] Furthermore, the shear key located on the anchoring device and the shear key located on the outer wall of the second base body are staggered.

[0011] Furthermore, the shear key located on the anchoring device and the shear key located on the outer wall of the second base body are arranged in alignment.

[0012] Furthermore, the anchor-point split assembly type anchor foundation also includes a grouting pipe, which can extend into the hollow structure of the second matrix and is used to pass the grouting material into the hollow structure of the second matrix and the gap at the connection position between the second matrix and the anchoring device.

[0013] It should be noted that grouting holes and lifting ears are arranged on the top of the anchoring device, and the anchor points are arranged symmetrically along the center of the side wall. The center line of the anchoring device is coaxial with the center line of the pile foundation. The anchoring device covers the pile foundation and is higher than the pile foundation by a certain height (to meet relevant design requirements). The inner side wall of the anchoring device and the outer side wall of the pile foundation (the part above the mud surface) are evenly spaced with shear keys (arranged in a square or equilateral triangle).

[0014] Furthermore, a packer is provided at the connection between the anchor-point split assembly type anchor foundation and the ground, and the packer can be sleeved on the outer side wall of the first substrate and / or the second substrate.

[0015] It should be noted that after the pile foundation is sunk, the soft soil or relatively soft soil within a certain depth range inside the pile foundation can be removed, and then the packer and anchor device can be installed.

[0016] A tension leg platform comprises an upper assembly block, a central column and a tension leg system, and also comprises the above-mentioned anchor-point split assembly type anchor foundation, wherein the anchor-point split assembly type anchor foundation is used to provide support for the upper assembly block, the central column and the tension leg system.

[0017] The anchor-point split-assembly anchor foundation of the present invention has the following advantages: the anchor-point split-assembly anchor foundation utilizes a first base body to be driven into the soil, and then the second base body is set as a hollow structure, and the reinforcement performed by the anchor device can greatly improve the overall stiffness and strength of the single pile foundation, improve the overall frequency of the wind turbine, and improve the comprehensive bearing performance of the wind turbine foundation, so that large-diameter single piles are suitable for deeper water depths and more complex marine environments. In addition, by arranging shear keys on the inner wall of the anchor device, the ability of the deep-water floating wind power platform to resist environmental loads is further improved.

[0018] The tension leg platform of the present invention has the following advantages: the tension leg platform cooperates with the concave anchoring device with the second pile foundation, and completely fills the gap of the shear key and the interior of the pile foundation with grouting material, so that the whole can withstand a large overturning moment and avoid damage to the shear key. The grouting material can not only increase the overall weight, but also combine the pile foundation and the anchoring device into one, thereby improving the pull-out bearing capacity of the single pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the anchor point type split assembly type anchor foundation structure of the present invention; Figure 2 for Figure 1 Sectional view at AA in the middle; Figure 3 for Figure 2 Cross-sectional view at BB in the middle.

[0020] Description of the markings in the figure: 1. Pile foundation; 11. First matrix; 12. Second matrix; 2. Anchoring device; 3. Lifting lug; 4. Anchor point; 5. Shear key; 6. Grouting material; 7. Packer; 8. Grouting pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0023] Please refer to the attached Figure 1 To Attachment Figure 3 The invention describes an anchor point type split assembly type anchor foundation and a tension leg platform.

[0024] This embodiment provides an anchor point type split assembly type anchor foundation, Figure 1 Schematic diagram of the anchor point split assembly anchor foundation structure of the present invention, as shown in Figure 1As shown, the anchor-point split assembly type anchor foundation includes a pile foundation 1, which includes a first base 11 and a second base 12 connected to each other, the first base 11 is used to be inserted into the ground, and the second base 12 is set as a hollow structure. The anchor-point split assembly type anchor foundation also includes an anchor device 2, which is sleeved on the outer wall of the second base 12, and a shear key 5 is set on the inner wall of the anchor device 2.

[0025] The anchor point type split assembly type anchor foundation utilizes the first base 11 to be driven into the soil, and then the second base 12 is set as a hollow structure. In conjunction with the reinforcement performed by the anchor device 2, the overall stiffness and strength of the single pile foundation can be greatly improved, the overall frequency of the wind turbine can be increased, and the comprehensive bearing performance of the wind turbine foundation can be improved, so that the large-diameter single pile is suitable for deeper water depths and more complex marine environments. In addition, by arranging a shear key 5 on the inner wall of the anchor device 2, the ability of the deep-water floating wind power platform to resist environmental loads is further improved.

[0026] Furthermore, if Figure 1 As shown, the outer wall of the second base 12 is also provided with a shear key 5, and the space between the second base 12 and the anchoring device 2 is completely filled with grouting material 6. The gap of the shear key 5 and the interior of the pile foundation 1 are completely filled with grouting material 6 (aggregates that meet the requirements can be appropriately added to save cement). The grouting material 6 can not only increase the overall weight, but also combine the pile foundation 1 and the anchoring device 2 into one, thereby improving the pull-out bearing capacity of the single pile.

[0027] Optionally, in this embodiment, the grouting material 6 may be concrete, wherein the concrete may be mixed with fine aggregate or coarse aggregate. In other embodiments, the grouting material 6 may also be replaced with cement slurry, which is not specifically limited here.

[0028] Furthermore, if Figure 1 As shown, the shape of the anchoring device 2 is set to be concave, and the concave part of the anchoring device 2 is sleeved on the outer wall of the second substrate 12.

[0029] Furthermore, if Figure 1 As shown, a lifting lug 3 is provided on the top of the outer wall of the concave anchoring device 2, and a rope hole is provided on the lifting lug 3 for connecting with other devices. In this embodiment, the lifting lug 3 can be used to connect TLP, that is, the tension leg platform in the background technology.

[0030] Furthermore, an anchor point 4 is provided on the outer side wall of the anchor device 2 .

[0031] In this embodiment, the shear key 5 located on the anchoring device 2 and the shear key 5 located on the outer wall of the second base body 12 are staggered.

[0032] Optionally, in other embodiments, the shear key 5 located on the anchoring device 2 and the shear key 5 located on the outer wall of the second substrate 12 are aligned.

[0033] Specifically, the shear keys 5 can also be fixed on the outer wall of the steel pipe in an array arrangement, with 5-10 shear keys 5 arranged on a circumference, and the spacing between adjacent shear keys 5 in the length direction of the pile foundation 1 can be 3-10 cm.

[0034] In this embodiment, the shape of the shear key 5 is an annular protrusion, which is welded to the outer wall of the second substrate 12 and evenly distributed along the axial direction. The purpose is to effectively enhance the friction and bite force between the grouting material 6 and the second substrate 12. In addition, the shape of the shear key 5 can also be optimized as a semicircular stiffening rib, which is composed of two right-angle fan-shaped stiffening ribs welded on the annular protrusion. Through this structure, the strength of the shear key 5 can be improved, and when the grouting connection section is subjected to a large overturning moment, the shear key 5 can be prevented from being damaged. Semicircular stiffening ribs are evenly arranged on the annular protrusion in an annular direction, and the structural dimensions are exactly the same. Each semicircular stiffening rib is perpendicular to the surface of the annular protrusion, and the thickness of the semicircular stiffening rib is the same as the thickness of the annular protrusion. In terms of structural function, the strength of the annular protrusion can be effectively improved by densely arranging semicircular stiffening ribs on the surface of the annular protrusion, and the friction and bite force between the shear key 5 and the grouting material 6 can be further improved.

[0035] Optionally, in some embodiments, the shear key 5 can also be arranged in a right-angled triangular prism shape, and the side corresponding to the right-angle side is fixed to the outer wall of the second pile foundation 12. The shear key 5 in the pile is arranged to be wide at the top and narrow at the bottom, which can be used to reduce the friction resistance of the soil during the penetration process, and also facilitates exhaust and helps grouting.

[0036] It should be noted that the shapes of the above-mentioned shear keys 5 are all existing structures. This embodiment adopts a shear key 5 with a semicircular structure. Those skilled in the art can select a suitable structure according to actual needs, and no specific limitation is made here.

[0037] Furthermore, if Figure 1-Figure 3 As shown, Figure 2 for Figure 1 Sectional view at AA in the middle; Figure 3 for Figure 2 In the cross-sectional view at BB in the middle, the anchor-point split assembly type anchor foundation also includes a grouting pipe 8, which can extend into the hollow structure of the second matrix 12 and is used to pass the grouting material 6 into the hollow structure of the second matrix 12 and the gap at the connection position between the second matrix 12 and the anchor device 2.

[0038] Furthermore, if Figure 1-Figure 3 As shown, a packer 7 is provided at the connection between the anchor point type split assembly type anchor foundation and the ground, and the packer 7 can be sleeved on the outer side wall of the first base 11 and / or the second base 12.

[0039] In this embodiment, if Figure 1-Figure 3 As shown, the packer 7 is sleeved on the outer wall of the second substrate 12, and the packer 7 is pressed to the ground by the anchoring device 2. The packer 7 can not only seal the grouting material 6, but also effectively prevent the anchoring device 2 from contacting the ground, thereby avoiding corrosion by the soil.

[0040] This embodiment also provides a tension leg platform, including an upper block, a central column and a tension leg system, and also includes the above-mentioned anchor-type split assembly type anchor foundation, which is used to provide support for the upper block, the central column and the tension leg system. The tension leg platform is configured to completely fill the gap of the shear key 5 and the interior of the pile foundation 1 with grouting material 6 by matching the concave anchor device 2 with the second pile foundation 1, so that the shear key 5 can be prevented from being damaged when the whole is subjected to a large overturning moment. The grouting material 6 can not only increase the overall weight, but also combine the pile foundation 1 with the anchor device 2 as a whole, thereby improving the pull-out bearing capacity of the single pile.

[0041] In addition, the above-mentioned anchor-point split assembly type anchor foundation is simple in form and light in overall weight. Under the condition of the same pull-out bearing capacity, the pile length can be effectively reduced, and the rated usage of the floating crane and the specification requirements of related offshore construction equipment can be reduced. In order to save offshore installation time costs and improve the overall construction quality, it can be transported and installed at sea after the overall construction on land is completed.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An anchor point split assembly type anchor foundation, characterized in that: It includes a pile foundation, which includes a first base and a second base connected to each other. The first base is used to be inserted into the ground, and the second base is set as a hollow structure. The anchor point type split assembly anchor foundation also includes an anchor device, which is sleeved on the outer wall of the second base, and a shear key is set on the inner wall of the anchor device.

2. The anchor point type split assembly type anchor foundation according to claim 1 is characterized in that: The outer wall of the second matrix is ​​also provided with a shear key, and the space between the second matrix and the anchoring device is completely filled with grouting material.

3. The anchor point type split assembly type anchor foundation according to claim 2 is characterized in that: The shape of the anchoring device is set to be concave, and the concave part of the anchoring device is sleeved on the outer wall of the second substrate.

4. The anchor point type split assembly type anchor foundation according to claim 3 is characterized in that: The top of the outer wall of the concave anchoring device is provided with a lifting lug, and a rope hole is provided on the lifting lug for connecting with other devices.

5. The anchor point type split assembly type anchor foundation according to any one of claims 1, 3 or 4, characterized in that: Anchor points are arranged on the outer side wall of the anchoring device.

6. The anchor point type split assembly type anchor foundation according to claim 3, characterized in that: The shear keys located on the anchoring device and the shear keys located on the outer wall of the second base body are staggered.

7. The anchor point type split assembly type anchor foundation according to claim 3, characterized in that: The shear key located on the anchoring device and the shear key located on the outer wall of the second base body are arranged in alignment.

8. The anchor point type split assembly type anchor foundation according to claim 1, characterized in that: The anchor point type split assembly type anchor foundation also includes a grouting pipe, which can extend into the hollow structure of the second matrix and is used to pass the grouting material into the hollow structure of the second matrix and the gap at the connection position between the second matrix and the anchoring device.

9. The anchor point type split assembly type anchor foundation according to claim 1, characterized in that: A packer is provided at the connection between the anchor point type split assembly type anchor foundation and the ground, and the packer can be sleeved on the outer side wall of the first substrate and / or the second substrate.

10. A tension leg platform, comprising an upper assembly, a central column and a tension leg system, characterized in that: It also includes the anchor-point split assembly type anchor foundation as described in any one of claims 1 to 9, and the anchor-point split assembly type anchor foundation is used to provide support for the upper module, the central column and the tension leg system.

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