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CN-224213357-U - Fan foundation structure based on extruded and expanded support disc piles

CN224213357UCN 224213357 UCN224213357 UCN 224213357UCN-224213357-U

Abstract

The utility model provides a fan foundation structure based on an extruded and expanded support disc pile, which belongs to the technical field of wind power engineering and comprises a main pile formed by reinforced concrete cast-in-place piles, wherein a plurality of bearing discs are arranged on the side wall of the main pile along the length direction of the main pile, and a plurality of branch structures are also arranged on the side wall of the main pile, wherein the thickness of a soil layer where the bearing discs are positioned is more than 4 times of the width of a self disc ring, and the thickness of a bearing layer of the branch structure is more than 3 times of the length of the branch structure. The utility model avoids the defects of insufficient bearing capacity, poor anti-capsizing performance, weak anti-pulling performance and the like of the traditional pile foundation of the wind turbine generator by mainly adopting the straight pile or the prefabricated pipe pile.

Inventors

  • SHI JUNMIN
  • LIU YANG
  • Zhen Shengtao
  • JIN XIAOHU
  • CHEN JIAN
  • TAN YONGJIE
  • XU JIAMING
  • LIU YULEI

Assignees

  • 中国电建集团河北省电力勘测设计研究院有限公司

Dates

Publication Date
20260508
Application Date
20250514

Claims (7)

  1. 1. A fan foundation structure based on extruded support disc piles comprises a main pile (1) formed by reinforced concrete filling piles and is characterized in that a plurality of bearing discs (2) are arranged on the side wall of the main pile (1) along the length direction of the main pile, a plurality of branch structures (3) are further arranged on the side wall of the main pile (1), the thickness of a soil layer where the bearing discs (2) are located is more than 4 times of the width of a disc ring of the main pile, and the thickness of a bearing layer of the branch structures (3) is more than 3 times of the length of the branch structures (3).
  2. 2. A fan foundation structure based on extruded and expanded support piles according to claim 1, wherein the diameter of the main piles (1) is 400-2000mm.
  3. 3. A fan foundation structure based on a squeeze-spread branch pile according to claim 1, wherein the branch structure (3) comprises a plurality of branch blocks (31) circumferentially arranged on the side wall of the main pile (1), each branch block (31) has a wedge-shaped cross section, and the width of the root of the branch block (31) close to the main pile (1) is larger than the width of the tail end of the branch block.
  4. 4. A fan foundation structure based on extruded and expanded branch piles as claimed in claim 3, wherein the length of each branch block (31) is 125-1000mm, and the ratio of the width to the length of each branch block (31) is more than or equal to 0.5.
  5. 5. The fan foundation structure based on the extruded and expanded support disc pile, which is characterized in that the reinforcement ratio of the main pile (1) is 0.3% -0.65%, and no steel bars are arranged in the bearing disc (2) and the branch structure (3).
  6. 6. A fan foundation structure based on extruded and expanded support disc piles according to claim 1, wherein the bearing discs (2) and the branch structures (3) are distributed alternately or in a combined mode.
  7. 7. The fan foundation structure based on the extruded and expanded support disc pile, as claimed in claim 1, is characterized in that the bearing disc (2) is of a horizontal annular structure, and the disc ring width of the bearing disc (2) is 50-300 mm.

Description

Fan foundation structure based on extruded and expanded support disc piles Technical Field The utility model belongs to the technical field of wind power engineering, and particularly relates to a fan foundation structure based on a squeezing and expanding support disc pile. Background As global energy structures are transformed to clean, wind power installation capacity continues to increase rapidly. The tower height of the large megawatt wind turbine is more than 150 meters, the diameter of the impeller breaks through 200 meters, and the vertical load and the horizontal overturning moment borne by the foundation structure are obviously increased. Meanwhile, offshore wind power projects are developed to deep open sea, geological conditions are increasingly complex (such as soft soil, sand layers and powdery clay staggered strata), and higher requirements on bearing capacity, pulling resistance and dynamic stability of pile foundations are provided. The traditional pile foundation of the wind turbine generator mainly adopts a straight pile or a prefabricated pipe pile, and faces the defects of insufficient bearing capacity, poor anti-capsizing performance, weak anti-pulling performance and the like. Disclosure of utility model The utility model aims to solve the technical problems that the traditional pile foundation of the wind turbine generator mainly adopts straight piles or prefabricated pipe piles, and has the defects of insufficient bearing capacity, poor anti-capsizing performance, weak anti-pulling performance and the like. The utility model relates to a fan foundation structure based on a squeezing and expanding support disc pile, which adopts the following technical scheme: A fan foundation structure based on a squeezed branch disc pile comprises a main pile formed by reinforced concrete filling piles, wherein a plurality of bearing discs are arranged on the side wall of the main pile along the length direction of the main pile, a plurality of branch structures are further arranged on the side wall of the main pile, the thickness of a soil layer where the bearing discs are located is greater than 4 times of disc ring width, and the thickness of a bearing layer of the branch structures is greater than 3 times of branch length. The technical scheme of the utility model is further improved in that the diameter of the main pile is 400-2000mm. The technical scheme of the utility model is further improved in that the branch structure comprises a plurality of branch blocks circumferentially arranged on the side wall of the main pile, the cross section of each branch block is wedge-shaped, and the width of the root part of each branch block close to the main pile is larger than the width of the tail end of each branch block. The technical scheme of the utility model is further improved in that the length of each branch block is 125-1000mm, and the ratio of the width to the length of each branch block is more than or equal to 0.5. The technical scheme of the utility model is further improved in that the reinforcement ratio of the main pile is 0.3% -0.65%, and no reinforcement exists in the bearing disc and the branch structure. The technical scheme of the utility model is further improved in that the bearing discs and the branch structures are distributed alternately or in a combined way. The technical scheme of the utility model is further improved in that the bearing disc is of a horizontal annular structure, and the width of the disc ring of the bearing disc is 50-300 mm. By adopting the technical scheme, the technical progress of the utility model is as follows: The utility model can enhance the friction force between the foundation structure and surrounding soil layers through the bearing disc and the branch structure, thereby enhancing the bearing capacity of the foundation structure by 30% -50%, can increase the contact area between the foundation structure and the surrounding soil layers, thereby enhancing the pulling-resistant bearing capacity of the foundation structure, and can disperse the horizontal load born by the foundation structure, thereby reducing the maximum bending moment value by 20% -35% and reducing the deformation of the main pile. In the utility model, the reinforcement ratio of the main pile is 0.3-0.65%, and the bearing disc and the branch structure are not provided with reinforcing steel bars, so that compared with the traditional pile foundation, the steel consumption is reduced by 20-45%, and the cost of the utility model is reduced by 10-20% compared with the traditional pile foundation due to the reduction of the concrete consumption and the steel consumption. Drawings FIG. 1 is a schematic structural view of a first embodiment of a fan foundation structure based on extruded and expanded support disc piles according to an embodiment of the present utility model; FIG. 2 is a schematic structural diagram of a second embodiment of a fan foundation structure based on extruded