Beam-plate-like wind tower foundation device and preparation method thereof

Abstract

The invention provides a beam-slab-like wind tower foundation device and a preparation method thereof.The beam-slab-like wind tower foundation device comprises an original bottom foundation, a newly-arranged top platform, newly-arranged foundation rib beams and a newly-arranged bottom annular belt-shaped foundation, the newly-arranged top platform is poured at the top of the original bottom foundation, and the newly-arranged bottom annular belt-shaped foundation is annularly arranged on the periphery of the original bottom foundation; a plurality of newly-arranged foundation rib beams are arranged on the outer side of the original bottom foundation, the tops of the newly-arranged foundation rib beams are connected with the side wall of the newly-arranged top table, and the bottoms of the newly-arranged foundation rib beams are connected with the newly-arranged bottom annular belt-shaped foundation. The top platform is arranged on the original bottom foundation, the newly-arranged bottom annular belt-shaped foundation is arranged on the outer side of the original bottom foundation, and the newly-arranged top platform, the original bottom foundation and the newly-arranged bottom annular belt-shaped foundation are connected through the newly-arranged foundation rib beams to form the beam-slab-like foundation, so that the performance of the original bottom foundation can be fully utilized; and the concrete volume of the foundation can be greatly reduced, and the service life of the existing foundation and facilities is prolonged and resource utilization is realized to a great extent.

Description

Technical Field

[0001] The present invention relates to the technical field of wind tower foundations, and in particular to a beam-plate type wind tower foundation device and a preparation method thereof. Background Art

[0002] At present, in the wind farm wind turbine renovation project, the basic method for the existing wind turbine foundation is to demolish the original foundation and build a new foundation. The existing technology requires the demolition of a large number of original foundations, involving the solid waste disposal of the original foundations; the existing technology demolishes the original foundations and builds new foundations, and a large number of original foundations, roads and other facilities are abandoned, which is not economical, and the project cost and construction period are unfavorable. Therefore, it is necessary to design a wind tower foundation that can make full use of the original foundation. Summary of the invention

[0003] The purpose of the present invention is to provide a beam-slab type wind tower foundation device and a preparation method thereof. The beam-slab foundation can fully utilize the performance of the original foundation, greatly reduce the concrete volume of the foundation, and maximize the life extension and resource utilization of the existing foundation and facilities.

[0004] According to one purpose of the present invention, the present invention provides a beam-slab type wind tower foundation device, including an original bottom foundation, a newly installed top platform, a newly installed foundation rib beam and a newly installed bottom annular strip foundation, the newly installed top platform is cast on the top of the original bottom foundation, the newly installed bottom annular strip foundation is arranged in an annular manner around the original bottom foundation, a plurality of newly installed foundation rib beams are arranged on the outer side of the top of the original bottom foundation, the top of the newly installed foundation rib beams is connected to the side wall of the newly installed top platform, and the bottom of the newly installed foundation rib beams is connected to the newly installed bottom annular strip foundation.

[0005] Furthermore, the original bottom foundation is a plate-type force-bearing structure, and the bottom of the original bottom foundation is connected to the ground through a pile foundation or a natural foundation.

[0006] Furthermore, additional reinforcement is provided between the newly-installed top platform and the original bottom foundation, the additional reinforcement is connected to the reinforcement in the original bottom foundation, and the top of the additional reinforcement is cast inside the newly-installed top platform.

[0007] Furthermore, a plurality of newly-installed top platform hidden beams are arranged in a circular shape around the periphery of the newly-installed top platform.

[0008] Furthermore, steel bars are provided inside the newly installed top platform hidden beam, and the steel bars inside the newly installed top platform hidden beam are fixedly connected to the anchor cage steel bars inside the original bottom foundation.

[0009] Furthermore, prestressed anchor bolts are arranged inside the newly-installed top platform hidden beam, and the bottoms of the prestressed anchor bolts are anchored into the original bottom foundation.

[0010] Furthermore, a plurality of the newly-established foundation rib beams are evenly arranged along the circumferential direction of the original bottom foundation.

[0011] Furthermore, radial reinforcement is arranged at the inner top of the newly-set foundation rib beam, and both ends of the radial reinforcement are anchored into the inner part of the newly-set top platform hidden beam and the newly-set bottom annular strip foundation, and the newly-set foundation rib beam is connected to the original bottom foundation by embedded reinforcement.

[0012] The above-mentioned method for preparing a beam-plate type wind tower foundation device comprises the following steps:

[0013] S1. Roughen the outer surface of the original bottom foundation, set new steel bars on the original bottom foundation, and weld the new steel bars to the steel bars in the original bottom foundation;

[0014] S2, pouring a new top platform on the top of the original bottom foundation;

[0015] S3. A new bottom annular strip foundation is set in the annular direction outside the original bottom foundation;

[0016] S4. A new foundation rib beam is set on the surface of the original bottom foundation, the top of the new foundation rib beam is connected to the new top platform, and the bottom of the new foundation rib beam is connected to the original bottom foundation.

[0017] Furthermore, in S2, a new top platform hidden beam is arranged in a circumferential direction around the new top platform, prestressed anchor bolts are arranged in the new top platform hidden beam, and the bottom of the new foundation rib beam is connected to the new top platform hidden beam.

[0018] The technical solution of the present invention is to set a new top platform on the original bottom foundation, set a new bottom annular strip foundation on the outside of the original bottom foundation, connect the new top platform and the new bottom annular strip foundation through a new foundation rib beam, and adopt a beam-slab foundation. It can make full use of the original foundation performance, greatly reduce the concrete volume of the foundation, and extend the life and resource utilization of the existing foundation and facilities to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A top view of a natural foundation according to an embodiment of the present invention;

[0021] Figure 2 It is a top view of the pile foundation of an embodiment of the present invention;

[0022] Figure 3 It is a cross-sectional view of the structure under the natural foundation of an embodiment of the present invention;

[0023] Figure 4 It is a cross-sectional view of the structure under the pile foundation of an embodiment of the present invention;

[0024] In the figure: 1. Original bottom foundation; 2. New bottom annular strip foundation; 3. New pile foundation; 4. New foundation rib beam; 5. New top platform; 6. New top platform hidden beam; 7. Prestressed anchor bolts; 8. Tower; 9: Original pile foundation. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] 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" and the like indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "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 indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example 1

[0029] like Figure 1-Figure 4 As shown,

[0030] A beam-slab type wind tower foundation device includes an original bottom foundation 1, a newly installed top platform 5, a newly installed foundation rib beam 4 and a newly installed bottom annular strip foundation 2. The original bottom foundation 1 is a foundation fixed on the ground, and the bottom of the original bottom foundation 1 is connected to the ground through an original pile foundation 9, and the bottom annular strip foundation 2 is connected to the ground through a newly installed pile foundation 3.

[0031] The newly established top platform 5 is cast on the top of the original bottom foundation 1. Before casting the newly established top platform 5, additional steel bars are set in the original bottom foundation 1. The additional steel bars are welded and connected to the steel bars in the original bottom foundation 1. The additional steel bars are exposed on the upper surface of the original bottom foundation 1. When casting the newly established top platform 5, the additional steel bars are cast inside the newly established top platform 5.

[0032] A plurality of newly installed top platform hidden beams 6 are arranged in a ring around the newly installed top platform 5 . The newly installed top platform hidden beams 6 are provided with steel bars. The steel bars inside the newly installed top platform hidden beams 6 are fixedly connected with the anchor cage steel bars in the original bottom foundation 1 .

[0033] A prestressed anchor bolt 7 is arranged inside the newly installed top platform hidden beam 6, and the bottom of the prestressed anchor bolt 7 is anchored inside the original bottom foundation 1. The height of the newly installed top platform hidden beam 6 is determined according to the length of the prestressed anchor bolt 7. The newly installed top platform hidden beam 6 is generally more than 1 meter higher than the outdoor floor. The tower 8 is arranged on the newly installed top platform 5 and the tower is fixedly connected to the prestressed anchor bolt 7.

[0034] A new bottom annular strip foundation 2 is provided in the outer circumferential direction of the original bottom foundation 1, and the new bottom annular strip foundation 2 is connected to the original bottom foundation 1 through steel bars to ensure the overall rigidity; a new pile foundation 3 is provided at the bottom of the new bottom annular strip foundation 2, and the new pile foundation 3 is connected to the foundation. The new bottom annular strip foundation 2 is lower than the outdoor floor, and the bottom of the new bottom annular strip foundation 2 is flush with the original bottom foundation 1.

[0035] A number of new foundation rib beams 4 are provided on the outside of the original bottom foundation 1, and the new foundation rib beams 4 are evenly arranged along the circumferential direction of the original bottom foundation 1. Radial steel bars are arranged on the inner top of the new foundation rib beams 4, and the radial steel bars are anchored into the new top platform hidden beams 6; the new foundation rib beams 4 are lower than the outdoor floor, so as to facilitate the covering of green plants on the entire foundation surface; the new foundation rib beams 4 are connected to the original bottom foundation 1 and the new bottom annular strip foundation 2 through steel bars.

[0036] The present invention is used in a wind turbine reconstruction project in a wind farm, and is used to reconstruct the existing wind turbine foundation, and to reuse the existing original bottom foundation 1.

[0037] The above-mentioned method for preparing a beam-plate type wind tower foundation device comprises the following steps:

[0038] 1. Roughen the outer surface of the existing original bottom foundation 1, and set new steel bars on the original bottom foundation 1. The new steel bars are welded 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 are stressed together to ensure the overall rigidity of the new and old foundations;

[0039] 2. A new top platform 5 is cast on the top of the original truncated cone-shaped bottom foundation 1, and newly added steel bars are cast inside the new top platform 5. A new top platform hidden beam 6 is set around the periphery of the new top platform 5. The steel bars of the new top platform hidden beam 6 are reliably connected with the steel bars of the anchor cage in the original bottom foundation 1; the prestressed anchor bolts 7 of the new unit are set in the new top platform hidden beam 6, and the prestressed anchor bolts 7 are anchored in the original bottom foundation 1; the height of the new top platform hidden beam 6 is determined according to the length of the prestressed anchor bolts 7 of the new unit, and the new top platform hidden beam 6 is generally more than 1 meter higher than the outdoor floor;

[0040] 3. A new bottom annular strip foundation 2 is set in the annular direction outside the original bottom foundation 1. The new bottom annular strip foundation 2 is connected to the original bottom foundation 1 through steel bars to ensure the overall rigidity; the new bottom annular strip foundation 2 is lower than the outdoor floor, and the bottom of the new bottom annular strip foundation 2 is flush with the original bottom foundation 1;

[0041] 4. A new foundation rib beam 4 is set on the surface of the original truncated cone-shaped bottom foundation 1. A radial steel bar is set on the top of the new foundation rib beam 4 to bear the force. The radial steel bar is anchored into the newly set top platform hidden beam 6; the newly set foundation rib beam 4 is lower than the outdoor floor, so that the surface can be covered with green plants after the overall foundation in-situ transformation is completed; the newly set foundation rib beam 4 is connected with the original bottom foundation 1 and the new bottom annular strip foundation 2 through steel bars.

[0042] The present invention takes into account that the foundation of the wind tower is subjected to the dynamic effect of wind load for a long time, and the foundation is mainly controlled by the bending moment of the wind load. The bending moment of the new wind turbine is generally more than twice the bending moment of the original foundation. By adopting the conventional method of expanding the cross-section, the foundation will be larger than the existing foundation. By adopting a beam-slab foundation, the performance of the original foundation can be fully utilized, the concrete volume of the foundation can be greatly reduced, the requirement that the foundation of a single machine does not protrude from the red line can be met, and the project cost and construction period can be effectively reduced.

[0043] For example, if a 1.5MW wind turbine is upgraded to a 6.25MW unit, the original foundation is a 12-meter-diameter truncated cone gravity foundation. The original foundation steel reinforced concrete consumption is about 300m 3 If the traditional technology of dismantling the new reduced or enlarged section is adopted, the wind load bending moment will be more than three times of the original bending moment of 46000kNm after the 1.5MW unit is upgraded to a 6.25MW unit. The new foundation diameter will be about 20 meters. If a gravity foundation is adopted, the amount of concrete used will be about 700m 3, and the new foundation originally exceeds the original foundation red line, conventional technology will not be able to solve the problem of limited land acquisition. The amount of reinforced concrete used in the new foundation of the present invention is about 1400m 3 , saving 300m3 of reinforced concrete compared with conventional technology 3 , saving about 42.9% of the engineering workload, with obvious results.

[0044] The present invention aims at pile foundations and natural foundations, 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.

[0045] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A beam-plate type wind tower foundation device, characterized in that: It includes an original bottom foundation, a newly installed top platform, a newly installed foundation rib beam and a newly installed bottom annular strip foundation. The newly installed top platform is cast on the top of the original bottom foundation. The newly installed bottom annular strip foundation is arranged in an annular manner around the original bottom foundation. A number of newly installed foundation rib beams are arranged on the outer side of the top of the original bottom foundation. The top of the newly installed foundation rib beam is connected to the side wall of the newly installed top platform, and the bottom of the newly installed foundation rib beam is connected to the newly installed bottom annular strip foundation.

2. The beam-plate type wind tower foundation device according to claim 1, characterized in that: The original bottom foundation is a plate-type force-bearing foundation, and the bottom of the original bottom foundation is connected to the ground through a pile foundation or a natural foundation.

3. The beam-plate type wind tower foundation device according to claim 1, characterized in that: Newly added steel bars are arranged between the newly-installed top platform and the original bottom foundation, the newly-installed steel bars are connected to the steel bars in the original bottom foundation, and the tops of the newly-installed steel bars are cast inside the newly-installed top platform.

4. The beam-plate type wind tower foundation device according to claim 1, characterized in that: A plurality of newly-established top platform hidden beams are arranged in a circular shape around the periphery of the newly-established top platform.

5. The beam-plate type wind tower foundation device according to claim 4, characterized in that: The newly-installed top platform hidden beam is internally provided with steel bars, and the steel bars inside the newly-installed top platform hidden beam are fixedly connected with the anchor cage steel bars inside the original bottom foundation.

6. The beam-plate type wind tower foundation device according to claim 5, characterized in that: Prestressed anchor bolts are arranged inside the newly-installed top platform hidden beam, and the bottoms of the prestressed anchor bolts are anchored into the original bottom foundation.

7. The beam-plate type wind tower foundation device according to claim 1, characterized in that: A plurality of the newly-established foundation rib beams are evenly arranged along the circumferential direction of the original bottom foundation.

8. The beam-plate type wind tower foundation device according to claim 4, characterized in that: Radial reinforcement is arranged on the inner top of the newly-set foundation rib beam, and both ends of the radial reinforcement are anchored into the inner part of the newly-set top platform hidden beam and the newly-set bottom annular strip foundation. The newly-set foundation rib beam is connected to the original bottom foundation through embedded reinforcement.

9. The method for preparing a beam-plate type wind tower foundation device according to claim 1, characterized in that: The steps include: S1. Roughen the outer surface of the original bottom foundation, set new steel bars on the original bottom foundation, and weld the new steel bars to the steel bars in the original bottom foundation; S2, pouring a new top platform on the top of the original bottom foundation; S3. A new bottom annular strip foundation is set in the annular direction outside the original bottom foundation; S4. A new foundation rib beam is set on the surface of the original bottom foundation, the top of the new foundation rib beam is connected to the new top platform, and the bottom of the new foundation rib beam is connected to the original bottom foundation.

10. The method for preparing a beam-plate type wind tower foundation device according to claim 9, characterized in that: In S2, a new top platform hidden beam is arranged in a circumferential direction around the new top platform, prestressed anchor bolts are arranged in the new top platform hidden beam, and the bottom of the new foundation rib beam is connected to the new top platform hidden beam.

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