CN213390202U

CN213390202U - Combined type polygonal tubular structure fan foundation

Info

Publication number: CN213390202U
Application number: CN202021130663.2U
Authority: CN
Inventors: 张立英
Original assignee: Huaneng Clean Energy Research Institute
Current assignee: Huaneng Clean Energy Research Institute
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2021-06-08
Anticipated expiration: 2030-06-17

Abstract

The utility model discloses a combined polygon tubular structure fan foundation, which comprises an extension foundation and a polygon tubular structure, wherein the bottom of the extension foundation is rigidly connected with the top of the polygon tubular structure, the polygon tubular structure comprises a plurality of pile bodies, and the pile bodies are arranged along the circumference of the polygon tubular structure; the bottom of the polygonal cylindrical structure extends into the foundation bearing layer; the bottom of extension basis and polygon tubular structure's top rigid connection, polygon tubular structure includes a plurality of piles, the pile is arranged along polygon tubular structure's circumferencial direction, polygon tubular structure's bottom stretches into ground bearing layer, it is higher to the foundation pile at the positioning accuracy of work progress and the straightness requirement that hangs down to have overcome the cylindrical structure, meet the shortcoming that the inhomogeneous area construction of geological stratification is difficult to satisfy the design requirement very much, make full use of polygon tubular structure side soil body resists the big moment of flexure effect of fan, reduce the engineering volume, reduce the cost of land wind turbine generator basis.

Description

Combined type polygonal tubular structure fan foundation

Technical Field

The utility model relates to a wind-powered electricity generation field especially relates to a modular polygon tubular structure fan basis.

Background

The wind turbine foundation is an important component part for building a wind power plant, and not only is the safe and reliable operation of the wind power plant concerned, but also the investment of the wind power plant is influenced. With the increasing popularization of wind power plant construction areas, in areas with poor engineering characteristics such as cohesive soil, silt and filling soil, the natural foundation cannot meet the construction requirements of the fan foundation, and foundation treatment is needed. The traditional foundation treatment mode of the wind turbine foundation usually adopts a pile foundation, namely, the large bending moment load of the wind turbine generator is converted into the vertical load of a foundation pile by utilizing the stress of the foundation pile. In order to meet the requirement of bearing capacity of the foundation piles, a plurality of foundation piles need to be arranged, and bearing platforms are poured to act together. The pile foundation has large foundation pile engineering quantity, large concrete volume of a bearing platform and higher overall cost. Along with the application of a large-capacity wind turbine generator, the amount of foundation expansion engineering adopted by a wind turbine foundation of a natural foundation is very large, the reduction of the manufacturing cost of the wind turbine foundation also becomes an important technical requirement under the background of wind power development in the flat era, and the wind turbine foundation of a cylindrical combined structure has higher requirements on the positioning accuracy and the verticality of a foundation pile in the construction process when the cylindrical structure is formed by the foundation pile, so that the design requirements are difficult to meet in the construction of areas with uneven geological stratification, and a foundation type easy to control the construction operation is needed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a modular polygon tubular structure fan basis, nimble application pressure filling pile or bored concrete pile adopt the integrated configuration that lower part polygon barrel and upper portion extension basis rigid connection formed, and the big moment of flexure effect of fan is resisted to the fully-utilized polygon tubular structure side soil body reduces the engineering volume, reduces the cost on land wind turbine generator system basis. Meanwhile, the construction control is easy, and the applicability is wider.

In order to realize the purpose, the utility model discloses a technical scheme is: a combined type polygonal tubular structure fan foundation comprises an expansion foundation and a polygonal tubular structure, wherein the bottom of the expansion foundation is rigidly connected with the top of the polygonal tubular structure, the polygonal tubular structure comprises a plurality of pile bodies, and the pile bodies are arranged along the circumferential direction of the polygonal tubular structure; the bottom of the polygonal cylindrical structure extends into the foundation bearing layer.

The pile body includes reinforced concrete pile and plain concrete pile, and reinforced concrete pile and plain concrete pile are along polygon tubular structure's week direction interval arrangement, and adjacent reinforced concrete pile and plain concrete pile interlock.

The diameter of the reinforced concrete pile is more than 300 mm; the strength of the pile body of the reinforced concrete pile is not lower than C15.

The whole body of the reinforced concrete pile is provided with a reinforcement cage or the upper half part of the reinforced concrete pile is provided with the reinforcement cage, and the reinforcement cage extends into the extension foundation.

The diameter of the plain concrete pile is not less than 600mm, and ultra-retarded concrete with the strength grade not less than C15 is adopted.

The pile body comprises reinforced concrete piles which are arranged along the circumferential direction of the polygonal tubular structure.

Two adjacent reinforced concrete piles are mutually meshed or tightly arranged.

And a gap is reserved between every two adjacent reinforced concrete piles, and the gap is not more than 0.5 time of the diameter of each reinforced concrete pile.

The overall height of the extended foundation and the polygonal tubular structure is 10-20 m.

The expanded foundation is polygonal or circular, when the expanded foundation is circular, the diameter of the expanded foundation is 8-14 m, the outer diameter of an inscribed circle of the polygonal tubular structure is not less than 85% of the diameter of the expanded foundation, and when the expanded foundation is polygonal, the diameter of the inscribed circle of the polygonal tubular structure is not less than 85% of the diameter of the inscribed circle of the expanded foundation.

Compared with the prior art, the utility model discloses following beneficial effect has at least: the bottom of the expanded foundation is rigidly connected with the top of the polygonal tubular structure, the polygonal tubular structure comprises a plurality of pile bodies, the pile bodies are arranged along the circumferential direction of the polygonal tubular structure, and the bottom of the polygonal tubular structure extends into the foundation bearing layer, so that the defects that the cylindrical structure has high positioning accuracy and verticality requirements on a foundation pile in the construction process, and the construction cannot meet the design requirements particularly in the regions with uneven geological stratification are overcome; the foundation soil pressure of the side face of the combined cylindrical structure foundation is fully utilized to resist the large bending moment load of the fan, and meanwhile, the extended foundation and the large polygonal cylindrical structure surface are adopted to bear on the section with large bending moment and shearing force, so that the strength of the combined structure body is fully utilized; the foundation can be applied to all onshore wind turbine foundations, particularly to wind turbine foundations needing foundation treatment and natural foundation foundations of large-capacity wind turbine generators, and has obvious economic advantages.

Further, set up the steel reinforcement cage in the pile body, the steel reinforcement cage can effectively improve the intensity of pile body and polygon tubular structure, and the steel reinforcement cage top stretches into extension basis cushion cap for polygon tubular structure and extension basis form effective connection, improve the rigidity of basis.

Furthermore, the upper part of the pile body is provided with the I-shaped steel which extends into the expansion foundation, so that the rigidity of the connection part and the whole foundation is improved.

Furthermore, the pile bodies are closely arranged along the circumferential direction of the polygonal tubular structure, the integrity of the polygonal tubular structure can be improved, and the pile body has better rigidity and strength.

Drawings

Fig. 1 is the utility model discloses facade structure schematic when polygon tubular structure adopts a plurality of reinforced concrete piles.

Fig. 2 is a schematic view of a sectional view of a vertical surface structure a-a of the polygonal tubular structure of the present invention when a plurality of reinforced concrete piles are used.

Fig. 3 is a schematic view of a reinforced concrete pile.

Fig. 4 is a schematic cross-sectional view of a 12-sided tubular structure in which reinforced concrete piles and plain concrete piles are mixed.

In the figure: 1-extended basis; 2-polygonal tubular structure; 3-reinforced concrete pile; 4-plain concrete pile; 5-reinforcement cage, 6-foundation bearing layer.

Detailed Description

The present invention will be explained in detail with reference to the accompanying drawings and the embodiments.

As shown in fig. 1 and 2, a combined polygonal tubular fan foundation comprises an expansion foundation 1 and a polygonal tubular structure 2, wherein the bottom of the expansion foundation 1 is rigidly connected with the top of the polygonal tubular structure 2, and the polygonal tubular structure 2 comprises a plurality of piles which are arranged along the circumferential direction of the polygonal tubular structure 2; the bottom of the polygonal tubular structure 2 extends into the foundation bearing layer 6.

Referring to fig. 4, in embodiment 1, the pile body includes reinforced concrete piles 3 and plain concrete piles 4, the reinforced concrete piles 3 and the plain concrete piles 4 are arranged at intervals in the circumferential direction of the polygonal tubular structure 2, and the adjacent reinforced concrete piles 3 and the plain concrete piles 4 are engaged, that is, the reinforced concrete piles 3 and the plain concrete piles 4 form a complete cylinder.

In embodiment 2, the pile body includes reinforced concrete piles 3, the reinforced concrete piles 3 are arranged along the circumference of the polygonal tubular structure 2, the reinforced concrete piles 3 are meshed with or closely arranged with the reinforced concrete piles 3 or a small gap is left at a part of the adjacent reinforced concrete piles 3, and the net gap is not more than 0.5 time of the diameter of the reinforced concrete piles; in the present embodiment, the number of sides of the polygonal tubular structure 2 is preferably 6.

Referring to fig. 3, in embodiments 1 and 2, the reinforced concrete pile 3 may be a cast-in-place pile or a press-cast pile of different construction methods, and the reinforced concrete pile 3 is provided with a reinforcement cage 5 on the whole or provided with a reinforcement cage 5 on the upper half.

The diameter of the reinforced concrete pile 3 is larger than 300 mm; the pile body strength of the reinforced concrete pile 3 is not lower than C15.

The diameter of the plain concrete pile 4 is not less than 600mm, and ultra-retarding concrete with the strength grade not less than C15 is adopted.

The overall height of the extended foundation 1 and the polygonal tubular structure 2 is 10-20 m.

When the extension foundation 1 and the polygonal tubular structure 2 are both polygons, the number of the polygons is an even number not less than 4, the number of the sides of the polygons of the extension foundation 1 and the polygonal tubular structure 2 in the same fan foundation can be consistent or inconsistent, and the extension foundation 1 can also be a circle.

When the expansion foundation 1 is circular, the diameter of the expansion foundation 1 is 8-14 m; optionally, the outer diameter of the inscribed circle of the polygonal tubular structure 2 is not less than 85% of the diameter of the expanded foundation 1.

When the expansion foundation 1 is polygonal, the diameter of an inscribed circle of the expansion foundation 1 is 8-14 m.

As the utility model discloses an optional embodiment, according to actual demand, set up steel reinforcement cage 5 in the serious reinforced concrete pile 3 of main wind direction pulling, and the reinforcing bar at 5 tops of steel reinforcement cage stretches into in the extension basis 1.

The utility model discloses carry out the construction that the pile body foundation was handled earlier, the pile body construction is accomplished and should be guaranteed the continuous complete of polygon tube-shape structure, carries out the construction of extension basis again.

Claims

1. The combined type polygonal tubular structure fan foundation is characterized by comprising an expansion foundation (1) and a polygonal tubular structure (2), wherein the bottom of the expansion foundation (1) is rigidly connected with the top of the polygonal tubular structure (2), the polygonal tubular structure (2) comprises a plurality of pile bodies, and the pile bodies are arranged along the circumferential direction of the polygonal tubular structure (2); the bottom of the polygonal cylindrical structure (2) extends into the foundation bearing layer (6); the pile body adopts reinforced concrete piles (3) and plain concrete piles (4), the reinforced concrete piles (3) and the plain concrete piles (4) are arranged at intervals along the circumferential direction of the polygonal tubular structure (2), and the adjacent reinforced concrete piles (3) and the plain concrete piles (4) are meshed;

or the pile body adopts the reinforced concrete piles (3), the reinforced concrete piles (3) are arranged along the circumferential direction of the polygonal tubular structure (2), and two adjacent reinforced concrete piles (3) are mutually occluded or tightly arranged.

2. The combined polygonal tubular fan foundation of claim 1, wherein when the pile body adopts a reinforced concrete pile (3) and a plain concrete pile (4), the diameter of the reinforced concrete pile (3) is more than 300 mm; the pile body strength of the reinforced concrete pile (3) is not lower than C15.

3. The combined type polygonal tubular fan foundation according to claim 1, wherein when the pile body is a reinforced concrete pile (3) and a plain concrete pile (4), the reinforced concrete pile (3) is provided with a reinforcement cage (5) on the whole or the upper half of the reinforced concrete pile (3) is provided with the reinforcement cage (5), and the reinforcement cage (5) extends into the extension foundation (1).

4. The combined polygonal tubular fan foundation of claim 1, wherein when the pile body is formed by a reinforced concrete pile (3) and a plain concrete pile (4), the diameter of the plain concrete pile (4) is not less than 600mm, and super-retarding concrete with the strength grade not less than C15 is used.

5. The combined polygonal tubular fan foundation according to claim 1, wherein when the pile body is made of reinforced concrete piles (3), a gap is left between two adjacent reinforced concrete piles (3), and the gap is not more than 0.5 times the diameter of each reinforced concrete pile.

6. The combined polygonal tubular fan foundation of claim 1, wherein the overall height of the extension foundation (1) and the polygonal tubular structure (2) is 10-20 m.

7. The combined type polygonal tubular fan foundation of claim 1, wherein the extension foundation (1) is polygonal or circular, when the extension foundation (1) is circular, the diameter of the extension foundation (1) is 8-14 m, the outer diameter of an inscribed circle of the polygonal tubular structure (2) is not less than 85% of the diameter of the extension foundation (1), and when the extension foundation (1) is polygonal, the diameter of an inscribed circle of the polygonal tubular structure (2) is not less than 85% of the diameter of the inscribed circle of the extension foundation (1).