Pipe barrel type wind tower foundation in soft soil area

Abstract

The utility model relates to the technical field of wind tower foundations, in particular to a soft soil area pipe barrel type wind tower foundation which comprises an original circular-truncated-cone-shaped foundation, a new foundation and secant piles, a new top platform is poured on the top of the original circular-truncated-cone-shaped foundation, the new foundation is arranged on the side surface of the original circular-truncated-cone-shaped foundation, first hidden beams are arranged on the periphery of the new top platform in the circumferential direction, and second hidden beams are arranged on the periphery of the new top platform. A first hidden beam is arranged in the original circular-truncated-cone-shaped foundation, a steel bar in the first hidden beam is connected with an anchor bolt cage steel bar in the original circular-truncated-cone-shaped foundation, a new unit prestressed anchor bolt is arranged in the first hidden beam and anchored into the original circular-truncated-cone-shaped foundation, a second hidden beam is arranged outside the new foundation in the annular direction, and a secant pile is arranged below the second hidden beam. Under the condition that the occupied area of an original foundation is not enlarged basically, the overall strength is improved, the bearing capacity of the original foundation is improved, and the engineering cost and the construction period are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind tower foundations, in particular to a tubular wind tower foundation in soft soil areas. Background Technique

[0002] In June 2023, the National Energy Administration promulgated the "Measures for the Renovation, Upgrade and Retirement Management of Wind Farms", which encourages wind farms with grid connection for more than 15 years and with a capacity of less than 1.5 MW to carry out renovation, upgrade and retirement. According to this measure, many old wind farms across the country are planning equal-capacity or capacity-expansion renovation work. In the future, the upgrade and renovation of wind power will be an important direction for the development of new wind energy.

[0003] In current wind farm fan renovation projects, for existing fan foundations, the existing technology basically involves demolishing the original foundation and building a new one. However, using this method has the following disadvantages:

[0004] The existing technology demolishes the original foundation and builds a new one. For upgrade and renovation projects with a relatively large single-unit capacity, the existing foundation red line does not meet the requirements; the existing technology demolishes the original foundation and builds a new one, resulting in a large amount of waste of original foundations, roads and other facilities, with weak economy and adverse effects on project costs and construction periods;

[0005] In view of the above disadvantages, there is an urgent need for a technical solution for in-situ renovation on the original foundation. Therefore, the present utility model is proposed. Content of the Utility Model

[0006] The purpose of the present utility model is to provide a tubular wind tower foundation in soft soil areas, which can solve the above technical problems.

[0007] The present utility model provides a tubular wind tower foundation in soft soil areas, including an original frustum-shaped foundation. A new top platform is poured on the top of the original frustum-shaped foundation. A new foundation is provided on the side surface of the original frustum-shaped foundation. A first hidden beam is circumferentially arranged around the new top platform. The steel bars in the first hidden beam are connected to the anchor bolt cage steel bars in the original frustum-shaped foundation. New unit prestressed anchor bolts are provided in the first hidden beam. The new unit prestressed anchor bolts are anchored into the original frustum-shaped foundation. One end of the above new unit prestressed anchor bolts protrudes from the surface of the new top platform and is connected to the newly installed tower barrel above.

[0008] Further, the top of the first hidden beam is more than 1 meter higher than the outdoor ground level.

[0009] Further, the projected area of the new foundation is the same as the projected area of the original frustum-shaped foundation.

[0010] Further, a second hidden beam is circumferentially arranged outside the new foundation. The second hidden beam is connected to the new foundation through steel bars.

[0011] Furthermore, the second concealed beam is lower than the outdoor ground level and is flush with the new foundation.

[0012] Furthermore, a rigid interlocking pile connected thereto is provided under the second concealed beam.

[0013] Furthermore, a plurality of circumferential steel bars and a plurality of radial steel bars are provided at the inner top of the new foundation, and the radial steel bars are anchored into the first concealed beam.

[0014] Furthermore, the circumferential steel bars are uniformly arranged from top to bottom within the buried depth range to prevent the concrete from splitting.

[0015] Furthermore, the top of the new foundation is lower than the outdoor ground level by at least 500 mm, which is convenient for covering the surface with green plants after the in-situ transformation of the overall foundation is completed.

[0016] Beneficial effects:

[0017] In the utility model, a new top platform is poured on the original frustum-shaped foundation of the wind tower. A new foundation is provided on the side surface of the original frustum-shaped foundation. A first concealed beam is circumferentially provided around the new top platform. The steel bars in the first concealed beam are connected to the anchor bolt cage steel bars in the original frustum-shaped foundation. A new unit prestressed anchor bolt is provided in the first concealed beam. The new unit prestressed anchor bolt is anchored into the original frustum-shaped foundation. One end of the new unit prestressed anchor bolt protrudes from the surface of the new top platform and is connected to the newly installed tower barrel above. A second concealed beam is circumferentially provided on the outer ring of the new foundation, and an interlocking pile is arranged under the second concealed beam. Without substantially expanding the floor area of the original foundation, the overall strength is increased, the bearing capacity of the original foundation is improved, and the project cost and construction period are saved. Description of the drawings

[0018] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a top view of the tubular wind tower foundation in the soft soil area of the embodiment of the utility model;

[0020] Figure 2 It is a side sectional view of the tubular wind tower foundation in the soft soil area of the embodiment of the utility model;

[0021] Description of the reference numerals: 1 - original frustum-shaped foundation, 2 - second concealed beam, 3 - rigid interlocking pile, 4 - new foundation, 5 - new top platform, 6 - first concealed beam, 7 - new unit prestressed anchor bolt, 8 - newly installed tower barrel, 9 - original pile foundation, 10 - outdoor ground level. Detailed implementation mode

[0022] The technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0024] 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 quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined. In addition, the terms "installation", "connection", and "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific situations.

[0025] Embodiment 1

[0026] A tube-shaped wind tower foundation in a soft soil area, as Figure 1-2 shown, includes the original frustum-shaped foundation 1. A new top platform 5 is poured on the top of the original frustum-shaped foundation 1. A new foundation 4 is provided on the side surface of the original frustum-shaped foundation 1. A first hidden beam 6 is circumferentially arranged around the new top platform 5. The top of the first hidden beam 6 is more than one meter higher than the outdoor ground 10. The steel bars in the first hidden beam 6 are connected to the anchor bolt cage steel bars in the original frustum-shaped foundation 1. A new unit prestressed anchor bolt 7 is arranged in the first hidden beam 6. The new unit prestressed anchor bolt 7 is anchored into the original frustum-shaped foundation 1. One end of the above new unit prestressed anchor bolt 7 protrudes from the surface of the new top platform 5 and is connected to the newly installed tower barrel 8 above.

[0027] A plurality of circumferential steel bars and a plurality of radial steel bars are arranged on the top of the new foundation 4. The radial steel bars are anchored in the first hidden beam 2. The circumferential steel bars are evenly arranged from top to bottom within the buried depth range to prevent concrete splitting. The top of the new foundation 4 is lower than the outdoor floor by more than or equal to 500mm, so that the surface can be covered with green plants after the overall foundation in-situ transformation is completed.

[0028] A second hidden beam 2 is provided in the outer ring direction of the new foundation 4. The second hidden beam 2 is connected to the original truncated cone-shaped foundation 1 through steel bars. The second hidden beam 2 is lower than the outdoor floor 10, and its top is flush with the new foundation 4. A hard bite pile 3 connected to the second hidden beam 2 is provided. The use of hard bite piles 3 can greatly reduce the bottom area of the foundation. In the upgrading and reconstruction project, it can meet the requirement that the foundation of a single machine does not exceed the original red line, and effectively reduce the project cost and construction period.

[0029] The construction method of this embodiment:

[0030] 1. Roughen the outer surface of the original truncated cone foundation 1;

[0031] 2. A new top platform 5 is cast on the top of the original truncated cone foundation 1. A first hidden beam 6 is set in the circumferential direction around the new top platform 5. The steel bars of the first hidden beam 6 are reliably connected to the steel bars of the anchor cage in the original truncated cone foundation 1. Prestressed anchor bolts 7 of the new unit are set in the first hidden beam 6, and the prestressed anchor bolts 7 of the new unit are anchored in the original truncated cone foundation 1. The height of the first hidden beam 6 is determined according to the length of the prestressed anchor bolts 7 of the new unit. The first hidden beam 6 is generally more than 1 meter higher than the outdoor floor.

[0032] 3. A new foundation 4 is cast on the side surface of the original truncated cone foundation 1. A plurality of circumferential steel bars and a plurality of radial steel bars are arranged on the top of the new foundation 4 to bear force. The plurality of radial steel bars are anchored in the first hidden beam 6 of the new top platform. The new foundation 4 is not less than 500 mm lower than the outdoor floor, so that the surface is covered with green plants after the in-situ transformation of the overall foundation is completed. The new foundation 4 is connected to the original truncated cone foundation 1 and the first hidden beam 6 through steel bars. Specifically, the new steel bars are welded to the steel bars in the original truncated cone foundation and extended into the new foundation, so that the new and old foundations bear force together, thereby ensuring the overall rigidity of the new and old foundations.

[0033] 4. A second hidden beam 2 is arranged in the outer ring direction of the new foundation 4. The second hidden beam 2 is connected to the new foundation 4 through steel bars to ensure the overall rigidity. The second hidden beam 2 is lower than the outdoor floor and is flush with the new foundation 4. A hard bite pile is arranged under the hidden beam 2.

[0034] Application examples:

[0035] A 1.5MW wind turbine was upgraded to a 6.25MW unit. The original foundation was a 15-meter-diameter truncated cone gravity foundation in a soft soil area with a red line width of 17 meters. The original foundation steel reinforced concrete consumption was about 400m 3 .

[0036] If the traditional technology of dismantling the original foundation and building a new one 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 used will be about 800m 3 , and the new foundation far exceeds the original foundation red line, conventional technology will not be able to solve the problem of restricted land acquisition.

[0037] With the technical solution of this application, the width of the second hidden beam of the new foundation is only 0.8m, and the diameter of the entire device is about 16.6m. Within the red line range, the problem of restricted land acquisition is solved, and the amount of reinforced concrete used for the new foundation is about 300m 3 , saving 500m3 of reinforced concrete compared with conventional technology 3 , saving about 62.5% of the engineering workload, with obvious results.

[0038] Considering that the wind tower foundation is subjected to the dynamic effect of wind load for a long time, 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 original bending moment. The utility model mainly targets the foundation conditions in soft soil areas, innovates the reinforcement structure form and studies the relevant key nodes and material properties, to form a universal in-situ transformation technology for wind tower foundations, to extend the life and resource utilization of existing foundations and facilities to the greatest extent, to comprehensively solve a series of problems existing in the existing technology such as environmental protection, land acquisition, construction period, investment, etc., to provide technical guarantee for the acquisition and implementation of future wind power upgrade and transformation projects.

[0039] Although this article uses more terms such as: 1-original truncated cone foundation, 2-second hidden beam, 3-hard interlocking pile, 4-new foundation, 5-new top platform, 6-first hidden beam, 7-new unit prestressed anchor bolt, 8-new tower, 9-original pile foundation, 10-outdoor floor, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model. It is contrary to the spirit of the utility model to interpret them as any additional restrictions.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A tubular wind tower foundation in soft soil area, including the original frustum-shaped foundation, characterized in that A new top platform is cast on the top of the original frustum-shaped foundation. A new foundation is provided on the side surface of the original frustum-shaped foundation. A first hidden beam is circumferentially arranged around the new top platform. The steel bars in the first hidden beam are connected to the anchor bolt cage steel bars in the original frustum-shaped foundation. New unit prestressed anchor bolts are provided in the first hidden beam, and the new unit prestressed anchor bolts are anchored into the original frustum-shaped foundation.

2. The tubular wind tower foundation in soft soil area according to claim 1, characterized in that, The top of the first hidden beam is more than 1 meter above the outdoor ground level.

3. The tubular wind tower foundation in soft soil area according to claim 1, characterized in that The projected area of the new foundation is the same as the projected area of the original frustum-shaped foundation.

4. The tubular wind tower foundation in soft soil area according to claim 3, characterized in that, A second hidden beam is circumferentially arranged outside the new foundation, and the second hidden beam is connected to the new foundation through steel bars.

5. The tubular wind tower foundation in soft soil area according to claim 4, characterized in that, The second hidden beam is lower than the outdoor ground level and is flush with the new foundation.

6. The tubular wind tower foundation in soft soil area according to claim 4, characterized in that, Hard interlocking piles connected to the second hidden beam are provided under the second hidden beam.

7. The tubular wind tower foundation in soft soil area according to claim 4, characterized in that, Multiple circumferential steel bars and multiple radial steel bars are provided at the top inside the new foundation, and the radial steel bars are anchored into the first hidden beam.

8. The tubular wind tower foundation in soft soil area according to claim 7, characterized in that, The circumferential steel bars are evenly arranged from top to bottom within the buried depth range.

9. The tubular wind tower foundation in soft soil area according to claim 4, characterized in that, The top of the new foundation is lower than the outdoor ground level by greater than or equal to 500 mm, which is convenient for covering the surface with green plants after the in-situ transformation of the overall foundation is completed.

Images