Mixing-like tower frame type foundation device

Abstract

The utility model provides a mixed-like tower frame type foundation device which comprises a bottom foundation, a top platform, a bottom hidden beam and a tower steel pipe, the top platform is poured at the top of the bottom foundation, the bottom hidden beam is annularly arranged on the periphery of the bottom foundation, a tower drum is fixed at the top of the top platform, and the tower steel pipe is fixed at the bottom of the top platform. The two ends of the tower steel pipe are hinged to the tower drum and the bottom hidden beam respectively. The top platform is arranged on the bottom foundation, the bottom hidden beam is arranged on the outer side of the bottom foundation, the tower drum is installed on the top platform, and the tower drum and the bottom hidden beam are connected through the tower steel pipe, so that the mixed-tower-like foundation is formed, the shearing performance of the beams and the bending moment reduction function of the tower steel pipe can be fully utilized, and therefore the mixed-tower-like foundation is formed. The concrete volume of the foundation can be greatly reduced, the diameter of the foundation is reduced, the engineering cost and the construction period are effectively reduced, and the method has a great application effect in land acquisition limited areas.

Description

Technical Field

[0001] The utility model relates to the technical field of wind tower foundations, in particular to a hybrid tower frame type foundation device. Background Art

[0002] Currently, wind turbine renovation projects at wind farms typically involve demolishing existing foundations and constructing new ones. Existing technologies require the removal of a significant amount of existing foundations, raising the issue of solid waste disposal. This process also results in the abandonment of a significant amount of existing foundations, roads, and other infrastructure, making it less economical and unfavorable for project costs and timelines.

[0003] When converting small wind turbines to large ones using conventional technology, the foundation diameter often exceeds the original small turbine diameter, requiring new land acquisition. This re-acquisition of land for existing wind farms is generally difficult, especially in scenic areas with existing small turbines. Therefore, it is necessary to design a wind tower foundation that fully utilizes the existing foundation, making it possible to replace some existing wind turbines with larger ones. Utility Model Content

[0004] The purpose of the utility model is to provide a quasi-hybrid tower frame type foundation device, which adopts a quasi-hybrid tower frame type foundation, can fully utilize the shear performance of the beam and the bending moment reduction function of the tower steel pipe, can greatly reduce the concrete volume of the foundation, reduce the foundation diameter, and effectively reduce the project cost and construction period, and has a greater application effect in areas with restricted land acquisition.

[0005] According to one purpose of the present utility model, the present utility model provides a hybrid tower tower type foundation device, including a bottom foundation, a top platform, a bottom hidden beam and a tower steel pipe, the top platform is cast on the top of the bottom foundation, the bottom hidden beam is arranged in a circumferential direction around the bottom foundation, the top of the top platform is fixed with a tower, and the two ends of the tower steel pipe are respectively hingedly connected to the tower and the bottom hidden beam.

[0006] Furthermore, there are multiple tower steel pipes, and the multiple tower steel pipes are evenly arranged around the periphery of the tower.

[0007] Furthermore, a new foundation is provided between the bottom foundation and the bottom hidden beam, and the new foundation is provided around the bottom foundation.

[0008] Furthermore, circumferential reinforcement and radial reinforcement are provided on the inner top of the newly-established foundation, and the radial reinforcement is anchored into the inner part of the top platform hidden beam.

[0009] Furthermore, the bottom foundation is a trapezoidal structure, and the bottom of the bottom foundation is connected to the foundation below it.

[0010] Furthermore, new steel bars are provided between the top platform and the bottom foundation, the new steel bars are connected to the steel bars in the bottom foundation, and the tops of the new steel bars are cast inside the top platform.

[0011] Furthermore, a plurality of top platform hidden beams are arranged in a circular shape around the periphery of the top platform, and steel bars are provided inside the top platform hidden beams. The steel bars inside the top platform hidden beams are fixedly connected to the anchor cage steel bars inside the bottom foundation.

[0012] Furthermore, a prestressed anchor bolt is provided inside the top platform hidden beam, the bottom of the prestressed anchor bolt is anchored into the bottom foundation, and the tower is fixedly connected to the prestressed anchor bolt.

[0013] Furthermore, a prestressed anchor cable and anchor bolt combination is provided at the bottom of the bottom concealed beam, and the prestressed anchor cable and anchor bolt combination is anchored to the ground.

[0014] Furthermore, the bottom of the bottom hidden beam is provided with an armpit.

[0015] The technical solution of the utility model is to set a top platform on the bottom foundation, set a bottom hidden beam on the outside of the bottom foundation, install the tower on the top platform, and connect the tower and the bottom hidden beam through a tower steel pipe. The tower-type foundation is adopted, which can fully utilize the shear performance of the beam and the bending moment reduction function of the tower steel pipe, reduce the foundation diameter, greatly reduce the concrete volume of the foundation, and effectively reduce the project cost and construction period, making it possible to transform the original small-unit fan into a large-unit fan in areas with restricted land acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0018] Figure 2 A top view of an embodiment of the present utility model;

[0019] In the figure: 1. Bottom foundation; 2. Bottom hidden beam; 3. Tower steel pipe; 4. New foundation; 5. Top platform; 6. Top platform hidden beam; 7. Prestressed anchor bolt; 8. Tower; 9: Added armpit. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0023] Example 1

[0024] like Figure 1-Figure 2 As shown,

[0025] A quasi-hybrid tower frame foundation device includes a bottom foundation 1, a top platform 5, a newly established foundation 4 and a bottom hidden beam 2. The bottom foundation 1 is a foundation fixed on the ground. The bottom foundation 1 is an original platform-shaped foundation, and the bottom of the bottom foundation 1 is connected to the foundation.

[0026] The top platform 5 is cast on the top of the bottom foundation 1. Before casting the top platform 5, new steel bars are set in the bottom foundation 1. The new steel bars are welded to the steel bars in the bottom foundation 1. The new steel bars are exposed on the upper surface of the bottom foundation 1. When casting the top platform 5, the new steel bars are cast inside the top platform 5.

[0027] A top platform hidden beam 6 is arranged in a ring around the top platform 5. The top platform hidden beam 6 is provided with steel bars. The steel bars inside the top platform hidden beam 6 are fixedly connected to the anchor cage steel bars in the bottom foundation 1.

[0028] Prestressed anchor bolts 7 are installed inside the roof platform hidden beam 6. The bottom of the prestressed anchor bolts 7 is anchored into the bottom foundation 1. The height of the roof platform hidden beam 6 is determined by the length of the prestressed anchor bolts 7. The roof platform hidden beam 6 is generally more than 1 meter above the outdoor floor. The tower 8 is installed on the roof platform 5 and is fixedly connected to the prestressed anchor bolts 7.

[0029] A bottom hidden beam 2 is arranged in a circumferential direction on the outer side of the bottom foundation 1. The bottom hidden beam 2 is connected to the bottom foundation 1 through steel bars to ensure the overall rigidity; the bottom of the bottom hidden beam 2 is connected to the foundation.

[0030] The bottom of the bottom hidden beam 2 is provided with an armpit 9. The height and inclination of the armpit 9 are determined according to calculation. The height of the armpit 9 is generally between 0mm and 1500mm.

[0031] A new foundation 4 is installed between the bottom foundation 1 and the bottom concealed beam 2, surrounding the bottom foundation 1. Circumferential and radial reinforcements are installed at the top of the new foundation 4, with the radial reinforcements anchored in the top platform concealed beam 6. The new foundation 4 is at least 500mm below the outdoor floor to facilitate covering with greenery after the in-situ renovation of the entire foundation is completed. The new foundation 4 is connected to the bottom foundation 1 and the bottom concealed beam 2 via reinforcement.

[0032] A plurality of tower steel pipes 3 are provided between the tower 8 and the bottom hidden beam 2, and are evenly arranged along the circumferential direction of the bottom foundation 1. The top of the tower steel pipe 3 is hingedly connected to the tower 8, and the bottom of the tower steel pipe 3 is hingedly connected to the bottom hidden beam 2.

[0033] The utility model is used in a wind turbine reconstruction project in a wind farm, and is used to reconstruct an existing wind turbine foundation and to reuse an existing bottom foundation 1 .

[0034] The preparation method of the above-mentioned hybrid tower type foundation device comprises the following steps:

[0035] 1. Roughen the outer surface of the existing bottom foundation 1 and install new steel bars on the bottom foundation 1. Weld the new steel bars to the steel bars in the original bottom foundation 1. The new steel bars are used to extend into the new foundation so that the new and old foundations bear the force together to ensure the overall rigidity of the new and old foundations.

[0036] 2. Cast a top platform 5 on top of the original frustum-shaped bottom foundation 1, cast new steel bars inside the top platform 5, set a top platform hidden beam 6 in the circumference of the top platform 5, and the steel bars of the top platform hidden beam 6 are reliably connected to the anchor cage steel bars in the bottom foundation 1; set the prestressed anchor bolts 7 of the new unit in the top platform hidden beam 6, and the tower 8 is set on the top platform 5 and fixedly connected to the prestressed anchor bolts 7; the prestressed anchor bolts 7 are anchored in the original bottom foundation 1; the height of the top platform hidden beam 6 is determined according to the length of the prestressed anchor bolts 7 of the new unit, and the top platform hidden beam 6 is generally more than 1 meter higher than the outdoor floor;

[0037] 3. A bottom hidden beam 2 is set in a circumferential direction outside the bottom foundation 1. The bottom hidden beam 2 is connected to the bottom foundation 1 through steel bars to ensure overall rigidity;

[0038] The bottom hidden beam 2 is lower than the outdoor floor and higher than the newly built foundation 4 to prevent the prestressed anchor bolts and anchor cables in the bottom hidden beam 2 from wading through water; the bottom hidden beam 2 is provided with a combination of prestressed anchor cables and anchor bolts, the number and combination of the prestressed anchor cables and anchor bolts are determined according to calculations, and are required to be symmetrically arranged; the bottom of the bottom hidden beam 2 is provided with an axil 9, the height and inclination of the axil 9 are determined according to calculations, and the height of the axil 9 is generally between 0mm and 1500mm;

[0039] 4. A new foundation 4 is set on the surface of the original frustum-shaped bottom foundation 1. Circumferential and radial reinforcements are set on the top of the new foundation 4 to bear the load. The radial reinforcements are anchored in the top platform hidden beam 6. The new foundation 4 is at least 500mm lower than the outdoor floor to facilitate the surface covering with green plants after the overall foundation in-situ renovation is completed. The new foundation 4 is connected to the bottom foundation 1 and the bottom hidden beam 2 through reinforcement.

[0040] 5. A tower steel pipe 3 is arranged between the top of the bottom hidden beam 2 and the tower 8. The top of the tower steel pipe 3 is hingedly connected to the tower 8, and the bottom of the tower steel pipe 3 is hingedly connected to the bottom hidden beam 2.

[0041] For example, a 1.5MW wind turbine is upgraded to a 6.25MW unit. The original foundation is a 12m diameter cone-shaped gravity foundation, rock foundation, and the red line width is 14m. The original foundation reinforced concrete volume is about 300m 3 .

[0042] If the traditional technology of dismantling the newly reduced or expanded section is adopted, the wind load bending moment of the 1.5MW unit after upgrading to a 6.25MW unit will be more than three times the original bending moment of 46,000 kNm. The diameter of the new foundation will be about 22 meters, and the amount of concrete required will be about 800m 3 , and the new foundation exceeds the original foundation red line, conventional technology will not be able to solve the problem of restricted land acquisition.

[0043] By adopting the technical solution of the utility model, the width of the new foundation hidden beam is only 0.8m, the diameter of the new foundation is about 13.6m, and the amount of reinforced concrete used for the new foundation is about 300m 3 , saving 400m3 of reinforced concrete compared to conventional technology 3 , saving about 50% of the engineering workload, with obvious results.

[0044] The utility model takes into account that the wind tower foundation is subjected to the dynamic effect of wind load for a long time, and the foundation is mainly controlled by the bending moment of wind load. The bending moment of the new unit is generally more than twice the bending moment of the original foundation. The conventional cross-section expansion method is adopted, and its foundation will be larger than the existing foundation. The mixed tower frame foundation is adopted, which can make full use of the shear performance of the beam, greatly reduce the concrete volume of the foundation, and effectively reduce the project cost and construction period.

[0045] This utility model aims at the rock foundation conditions, innovates the reinforcement structure form and studies the relevant key nodes and material properties, forming a universal in-situ transformation technology for wind tower foundations, which can extend the life and resource utilization of existing foundations and facilities to the greatest extent, and provide technical guarantee for the acquisition and implementation of future wind power upgrade and transformation projects.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A kind of mixed tower tower type foundation device, characterized in that: It includes a bottom foundation, a top platform, a bottom hidden beam and a tower steel pipe. The top platform is cast on the top of the bottom foundation. The bottom hidden beam is arranged in a circumferential direction around the bottom foundation. A tower is fixed on the top of the top platform. The two ends of the tower steel pipe are respectively hingedly connected to the tower and the bottom hidden beam.

2. The hybrid tower type foundation device according to claim 1, characterized in that: There are multiple tower steel pipes, and the multiple tower steel pipes are evenly arranged around the periphery of the tower.

3. The hybrid tower type foundation device according to claim 1, characterized in that: A new foundation is provided between the bottom foundation and the bottom hidden beam, and the new foundation is provided around the bottom foundation.

4. The hybrid tower type foundation device according to claim 1, characterized in that: New reinforcement bars are provided between the top platform and the bottom foundation, the new reinforcement bars are connected to the reinforcement bars in the bottom foundation, and the tops of the new reinforcement bars are cast inside the top platform.

5. The hybrid tower type foundation device according to claim 3, characterized in that: A plurality of top platform hidden beams are arranged in a circular shape around the periphery of the top platform, and the top platform hidden beams are more than 1 meter higher than the outdoor floor.

6. The hybrid tower type foundation device according to claim 5, characterized in that: Steel bars are provided inside the top platform hidden beam, and the steel bars inside the top platform hidden beam are fixedly connected to the anchor cage steel bars inside the bottom foundation.

7. The hybrid tower type foundation device according to claim 6, characterized in that: Circumferential steel bars and radial steel bars are arranged on the inner top of the newly-established foundation, and the radial steel bars are anchored into the inner part of the top platform hidden beam.

8. The hybrid tower type foundation device according to claim 6, characterized in that: A prestressed anchor bolt is provided inside the top platform hidden beam, the bottom of the prestressed anchor bolt is anchored into the bottom foundation, and the tower is fixedly connected to the prestressed anchor bolt.

9. The hybrid tower type foundation device according to claim 1, characterized in that: The bottom of the bottom hidden beam is provided with an armpit.

10. The hybrid tower type foundation device according to claim 9, characterized in that: The height of the added armpit is between 0mm and 1500mm.

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