Single-pile anchor point type compaction type anchoring foundation and tension leg platform

Abstract

The invention discloses a single-pile anchor point type compaction type anchoring foundation and a tension leg platform, the single-pile anchor point type compaction type anchoring foundation comprises a pile foundation, the pile foundation comprises a first base body and a second base body, the first base body and the second base body can be inserted into the ground, the first base body is of a hollow structure, and the interior of the first base body is used for containing the second base body; shear keys are arranged on the first base body and / or the second base body, the shear keys are regularly distributed in a gap between the first base body and the second base body, and the space between the first base body and the second base body is completely filled with grouting materials, so that the first base body and the second base body form a unified whole. According to the single-pile anchor point type compaction type anchoring foundation, the overall uplift bearing capacity is improved through the outer wall body of the first base body and the inner wall of the second base body which are nested with each other, in addition, due to the difference between the inner diameter of the first base body and the inner diameter of the second base body, the injected soil body can be further extruded, the compaction degree of the soil body is improved, and the construction efficiency is improved. Therefore, the uplift bearing capacity of the whole foundation is improved.

Description

Technical Field

[0001] The invention belongs to the field of floating offshore wind power engineering, and in particular relates to a single-pile anchor point type compacted 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 a single-pile anchor point compaction type anchor foundation suitable for deep sea areas and to improve 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, a single pile anchor point compaction 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 a single-pile anchor point compaction type anchor foundation and a tension leg platform of the present invention is as follows: The present embodiment provides a single-pile anchor point type compaction type anchor foundation, which includes a pile foundation, and the pile foundation includes a first substrate and a second substrate. The first substrate and the second substrate can be inserted into the ground, and the first substrate is configured as a hollow structure, and the interior is used to accommodate the second substrate. Shear keys are arranged on the first substrate and / or the second substrate, and the shear keys are regularly distributed in the gap between the first substrate and the second substrate. The gap between the first substrate and the second substrate is completely filled with grouting material so that the first substrate and the second substrate form a unified whole.

[0006] Furthermore, shear keys are provided on both the first substrate and the second substrate.

[0007] Furthermore, the second base includes a first connecting part and a second connecting part, the first connecting part is larger than the second connecting part, and the outer wall of the first connecting part can be abutted and fixedly connected with the inner wall of the first base, and the outer wall of the second connecting part is provided with a shear key.

[0008] Furthermore, an inclined surface is provided between the first connecting portion and the second connecting portion, and the first connecting portion and the second connecting portion are connected via the inclined surface.

[0009] Furthermore, a lifting lug is provided on the top of the first pile foundation, and an ear hole is provided on the lifting lug for connection with other devices.

[0010] Furthermore, the single-pile anchor point compaction-type anchor foundation also includes a replacement component, which can drive the second matrix into the hollow structure of the first matrix from the top.

[0011] Furthermore, the shear keys located on the first substrate and the shear keys located on the second substrate are staggered.

[0012] Furthermore, the shear key located on the first substrate and the shear key located on the second substrate are arranged in alignment.

[0013] Furthermore, the second base also includes a water pump for pumping out seawater and mud inside the pile foundation.

[0014] A tension leg platform comprises an upper assembly, a central column and a tension leg system, characterized in that it also comprises the above-mentioned single-pile anchor point type compaction type anchor foundation, and the single-pile anchor point type compaction type anchor foundation is used to provide support for the upper assembly, the central column and the tension leg system.

[0015] The single-pile anchor point type compaction anchor foundation of the present invention has the following advantages: the single-pile anchor point type compaction anchor foundation utilizes the outer wall of the first matrix and the inner wall of the second matrix which are nested with each other to improve the overall pull-out bearing capacity; in addition, due to the size difference between the inner diameter of the first matrix and the inner diameter of the second matrix, the penetrated soil can be further squeezed to improve its density, further increase the side friction of the pile foundation as a whole, and thus improve the pull-out bearing capacity of the overall foundation.

[0016] The tension leg platform of the present invention has the following advantages: the tension leg platform sets the second base in the first base, and the center line is set coaxially, and the second base is higher than the first base by a certain height (meeting relevant design requirements), and the outer side wall of the second base and the inner side wall of the first base are evenly spaced and covered with shear keys, which ensures the side friction of the pile foundation as a whole, and the gap of the shear key is completely filled with grouting material, which can not only increase the overall weight, but also combine the first base and the second base into one, thereby improving the pull-out bearing capacity of the single pile. A water inlet and a water pump are set at the center of the top plate of the second base to ensure that seawater and mud can be discharged in time. At the same time, the diameter of the second base is significantly smaller than the diameter of the inner wall of the first base. The soil penetrated into the second base will be more dense due to further squeezing by the second base, which can increase the side friction of the inner wall of the second base, thereby improving the pull-out bearing capacity of the overall foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a single-pile anchor point compaction type anchor foundation of the present invention; Figure 2 A top view of the single-pile anchor point compaction type anchor foundation of the present invention; Figure 3 It is a bottom view of the single-pile anchor point compaction type anchor foundation of the present invention.

[0018] Description of the markings in the figure: 1. Pile foundation; 11. First base; 12. Second base; 2. Shear key; 3. Grouting material; 4. Inclined surface; 5. Lifting ear; 51. Ear hole; 6. Replacement component. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] Please refer to the attached Figure 1 To Attachment Figure 3 The invention describes a single-pile anchor point compaction type anchor foundation and a tension leg platform.

[0022] This embodiment provides a single-pile anchor point compaction type anchor foundation. Figure 1 Schematic diagram of the anchor point split assembly anchor foundation structure of the present invention, as shown in Figure 1 As shown, the single-pile anchor point type compaction anchor foundation includes a pile foundation 1, which includes a first matrix 11 and a second matrix 12. The first matrix 11 and the second matrix 12 can be inserted into the ground, and the first matrix 11 is set as a hollow structure, and the interior is used to accommodate the second matrix 12. Shear keys 2 are arranged on the first matrix 11 and / or the second matrix 12, and the shear keys 2 are regularly distributed in the gap between the first matrix 11 and the second matrix 12. The gap between the first matrix 11 and the second matrix 12 is completely filled with grouting material 3 so that the first matrix 11 and the second matrix 12 form a unified whole.

[0023] The single-pile anchor point compaction-type anchor foundation utilizes the outer wall of the first matrix 11 and the inner wall of the second matrix 12 which are nested with each other to improve the overall pull-out bearing capacity. In addition, due to the size difference between the inner diameter of the first matrix 11 and the inner diameter of the second matrix 12, the penetrated soil can be further squeezed to improve its density, further increase the side friction of the pile foundation as a whole, and thus improve the pull-out bearing capacity of the overall foundation.

[0024] Furthermore, if Figure 1 As shown, shear keys 2 are provided on both the first base body 11 and the second base body 12 .

[0025] Optionally, in this embodiment, the grouting material 3 may be concrete, wherein the concrete may be mixed with fine aggregate or coarse aggregate. In other embodiments, the grouting material 3 may also be replaced with cement slurry, which is not specifically limited here.

[0026] Furthermore, the second base 12 includes a first connection part and a second connection part, the first connection part is larger than the second connection part, and the outer wall of the first connection part can abut and be fixedly connected with the inner wall of the first base 11, and the outer wall of the second connection part is provided with a shear key 2.

[0027] Furthermore, an inclined surface 4 is provided between the first connecting portion and the second connecting portion, and the first connecting portion and the second connecting portion are connected via the inclined surface 4 .

[0028] Furthermore, a lifting lug 5 is provided on the top of the first pile foundation 1 , and an ear hole 51 is provided on the lifting lug 5 for connecting with other devices.

[0029] As a preferred embodiment, Figure 1 As shown, the ear 5 is provided with an ear hole 51 for connecting with other devices. In this embodiment, the ear 5 can be used to connect TLP, that is, the tension leg platform in the background technology.

[0030] Specifically, two lifting ears 5 are symmetrically arranged on the top plate of the second base 12 or at the same horizontal position of the outer side wall of the first base 11, and their function is to facilitate the offshore lifting operation of the first base 11; a detachable replacement component 6 is arranged on the top of the first base 11 to facilitate the pile driving operation of the first base 11.

[0031] As a preferred embodiment, the above-mentioned lifting ear 5 is configured as a spherical lifting ear 5, which is located on the top plate of the second base 12 and is generally connected to the tension leg platform through a universal joint (the universal joint is a prior art well known to those skilled in the art, not shown in the figure). The spherical lifting ear 5 is of a fixed or non-fixed type. The fixed spherical lifting ear 5 is fixed on the top plate of the second base 12 and cannot be rotated at any angle, and can completely rely on the universal joint for force transmission; the non-fixed spherical lifting ear 5 is welded to the caliper under the top plate of the second base 12 and can be rotated in a plane, which can assist the universal joint to more reasonably transmit force.

[0032] Furthermore, the single-pile anchor point compaction-type anchor foundation further includes a replacement component 6 , which can drive the second matrix 12 into the hollow structure of the first matrix 11 from the top.

[0033] Specifically, the replacement component 6 can be detachably connected to the top of the second base body 12, so as to facilitate the pile sinking operation of the pile foundation 1.

[0034] Furthermore, the shear key 2 located on the first substrate 11 and the shear key 2 located on the second substrate 12 are staggered.

[0035] Furthermore, the shear key 2 located on the first substrate 11 and the shear key 2 located on the second substrate 12 are aligned.

[0036] Specifically, the shear keys 2 can also be fixed on the outer wall of the steel pipe in an array arrangement, with 5-10 shear keys 2 arranged on a circumference, and the spacing between adjacent shear keys 2 in the length direction of the pile foundation 1 can be 3-10 cm.

[0037] It is understandable that the main function of the shear key 2 is to transmit and disperse the shear force, ensure the stability and safety of the structure, prevent the object from damaging other parts when the shear force is too large, and ensure that different materials or structural parts can work together. Specifically, the shear key 2 is used in the structure to resist and transmit the shear force generated by the external force, so as to maintain the overall stability and integrity of the structure. In addition, the shear key 2 can be applied to different engineering fields. For example, in the steel-concrete bridge composite structure, the main function of the shear key 2 is to prevent the longitudinal shear force on the interface between the steel beam and the concrete flange plate, resist the relative slip between the two, and ensure that the concrete bridge deck and the steel beam work together to form a whole. In addition, the shear key 2 can also be used in other structures. For example, at the connection between the steel structure and the concrete, its function is to transmit the shear force and prevent the relative slip between the beam and the plate, thereby improving the shear bearing capacity of the structure. Therefore, those skilled in the art can select the appropriate arrangement of the shear key 2 according to the actual situation, and no specific limitation is made here.

[0038] In this embodiment, the shape of the shear key 2 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 3 and the second substrate 12. In addition, the shape of the shear key 2 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 2 can be improved, and when the grouting connection section is subjected to a large overturning moment, the shear key 2 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 2 and the grouting material 3 can be further improved.

[0039] Optionally, in some embodiments, the shear key 2 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 1. The shear key 2 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.

[0040] It should be noted that the shapes of the above-mentioned shear keys 2 are all existing structures. This embodiment adopts a shear key 2 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.

[0041] Furthermore, the second base body 12 also includes a water pump for pumping out seawater and mud inside the pile foundation 1 .

[0042] Optionally, Figure 2It is a top view of the single-pile anchor point compaction type anchor foundation of the present invention, Figure 3 FIG. 1 is a bottom view of the single-pile anchor point compaction type anchor foundation of the present invention, as shown in FIG. Figure 1-3 As shown, the first matrix 11 and the second matrix 12 are cylindrical in shape, and a water suction port and a water pump are arranged at the center of the top plate of the second matrix 12 to ensure that seawater and mud can be discharged in time. At the same time, the diameter of the second matrix 12 is significantly smaller than the inner wall diameter of the first matrix 11. The soil penetrated into the second matrix 12 will be further squeezed by the second matrix 12 to be denser, which can increase the side friction of the inner wall of the second matrix 12, thereby improving the pull-out bearing capacity of the overall foundation.

[0043] It should be noted that the above-mentioned single-pile anchor point compaction anchor foundation is particularly suitable for various water depth environments, complex geological conditions (except rocks) and harsh environmental conditions. Its anchor foundation form is simple and the overall weight is relatively light. Under the condition of the same pull-out bearing capacity, it can effectively reduce the pile length, reduce the rated usage of the floating crane and the specification requirements of related offshore construction equipment; in order to save the time cost of offshore installation and improve the overall construction quality, it can be transported and installed at sea after the overall construction on land is complete. The construction and construction quality of the overall anchor foundation are controllable, and the engineering significance is great.

[0044] This embodiment also provides a tension leg platform, including an upper assembly, a central column and a tension leg system, characterized in that it also includes the above-mentioned single-pile anchor point type compaction type anchor foundation, and the single-pile anchor point type compaction type anchor foundation is used to provide support for the upper assembly, the central column and the tension leg system.

[0045] Specifically, the above-mentioned single-pile anchor point compaction type anchor foundation and the tension leg platform (TLP) are usually connected by anchor chains, thereby achieving the purpose of fixing the deep-sea offshore wind turbine TLP platform within a certain allowable range.

[0046] 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. A single pile anchor point compaction type anchor foundation, characterized in that: The pile foundation includes a first substrate and a second substrate. The first substrate and the second substrate can be inserted into the ground. The first substrate is set as a hollow structure, and the interior is used to accommodate the second substrate. Shear keys are set on the first substrate and / or the second substrate. The shear keys are regularly distributed in the gap between the first substrate and the second substrate. The gap between the first substrate and the second substrate is completely filled with grouting material so that the first substrate and the second substrate form a unified whole.

2. The single-pile anchor point compaction anchor foundation according to claim 1, characterized in that: Shear keys are arranged on the first base and the second base.

3. The single-pile anchor point compaction anchor foundation according to claim 2, characterized in that: The second base includes a first connection part and a second connection part. The first connection part is larger than the second connection part, and the outer wall of the first connection part can abut and be fixedly connected with the inner wall of the first base. The outer wall of the second connection part is provided with a shear key.

4. The single-pile anchor point compaction anchor foundation according to claim 3, characterized in that: An inclined surface is arranged between the first connecting portion and the second connecting portion, and the first connecting portion and the second connecting portion are connected via the inclined surface.

5. The single-pile anchor point compaction type anchor foundation according to claim 1, characterized in that: A lifting lug is arranged on the top of the first pile foundation, and an ear hole is arranged on the lifting lug for connecting with other devices.

6. The single-pile anchor point compaction anchor foundation according to claim 1, characterized in that: The single-pile anchor point compaction-type anchor foundation also includes a replacement component, which can drive the second matrix into the hollow structure of the first matrix from the top.

7. The single-pile anchor point compaction type anchor foundation according to claim 2, characterized in that: The shear keys located on the first substrate and the shear keys located on the second substrate are staggered.

8. The single-pile anchor point compaction type anchor foundation according to claim 2, characterized in that: The shear key located on the first substrate and the shear key located on the second substrate are arranged in alignment.

9. The single-pile anchor point compaction anchor foundation according to any one of claims 1 to 8, characterized in that: The second base also includes a water pump for pumping out seawater and mud inside the pile foundation.

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

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