CN217782125U

CN217782125U - Composite pile fan foundation and wind turbine generator system

Info

Publication number: CN217782125U
Application number: CN202221520258.0U
Authority: CN
Inventors: 郑以微
Original assignee: Beijing Tianrun Xinneng Investment Co ltd
Current assignee: Beijing Tianrun Xinneng Investment Co ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-11-11
Anticipated expiration: 2032-06-17

Abstract

The application discloses compound pile fan foundation and wind turbine generator system, compound pile fan foundation are used for supporting a wind turbine generator system tower section of thick bamboo on non-rock stratum, including a plurality of precast piles, fan foundation and a plurality of stock. The precast pile is completely embedded in the stratum; the wind turbine foundation is arranged on one side of the precast pile, is completely or partially embedded in the stratum and is used for supporting a tower drum of the wind turbine generator; a plurality of the stock sets up between fan basis and a plurality of precast pile, and fan basis and at least partial precast pile are connected to a plurality of stocks. This composite pile fan foundation and wind generating set can effectively utilize the reinforcing effect of precast pile to the ground and the pulling force that the precast pile received, improves the intensity of ground, reduces the area on composite pile fan foundation.

Description

Composite pile fan foundation and wind turbine generator system

Technical Field

The application belongs to the technical field of wind power generation, and particularly relates to a composite pile fan foundation and a wind power generation unit.

Background

Wind energy, as a clean renewable energy source, is increasingly gaining attention from countries around the world, and the wind power generation industry is rapidly growing. With the development of the wind power industry, the height of the onshore wind power tower and the single-machine capacity of the fan are gradually increased, and the load of the fan transmitted to the bottom of the tower is correspondingly and greatly increased, so that the large-capacity unit has higher requirements on the rigidity of a fan foundation, the bearing capacity of a foundation and the stability of the fan foundation. In engineering project construction, under the condition of meeting the operation safety of a large unit, how to reduce the design area of a fan foundation and meet project land acquisition limiting conditions becomes a key factor for smooth implementation of projects. The traditional gravity type fan foundation occupies a large area, the land acquisition cost of a project is high, and the project coordination is difficult; the traditional pile foundation has higher requirement on the bearing capacity of a single pile, longer pile length and high construction cost. Therefore, a new fan foundation is needed to achieve the purpose of reducing the floor area of the fan foundation.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a composite pile fan foundation and wind generating set can effectively utilize the precast pile to the reinforcing effect of ground and the pulling force that the precast pile received, improves the intensity of ground, reduces the area on composite pile fan foundation.

The embodiment of the first aspect of the application provides a compound pile fan foundation, and compound pile fan foundation is used for supporting a wind turbine generator system tower section of thick bamboo on non-rock type stratum, and compound pile fan foundation includes a plurality of precast piles, fan foundation and a plurality of stock. The precast pile is completely embedded in the stratum; the wind turbine foundation is arranged on one side of the precast pile, is completely or partially embedded in the stratum and is used for supporting a tower drum of the wind turbine generator; a plurality of the stock sets up between fan foundation and a plurality of precast pile, and fan foundation and at least partial precast pile are connected to a plurality of stocks.

According to the embodiment of the first aspect of the application, the precast pile comprises a first precast pile and a second precast pile which are arranged at intervals, and the anchor rods are connected with the second precast pile.

In any one of the embodiments of the first aspect of the present application, the first plurality of pre-piles are spaced apart in a first region and the second plurality of pre-piles are spaced apart in a second region, the second region surrounding the first region.

According to any of the preceding embodiments of the first aspect of the present application, the anchor rod further comprises a rod body comprising a first end and a second end, and an anchor plate connected to the first end and/or the second end.

According to any one of the preceding embodiments of the first aspect of the present application, the precast pile is a solid pile, and the anchor plate is connected with the end face of the precast pile close to the wind turbine foundation.

According to the aforementioned arbitrary embodiment of this application first aspect, the precast pile is the tubular pile, and in the precast pile was located to the anchor slab, composite pile fan foundation still included the slip casting material of filling between tubular pile and stock.

According to any one of the preceding embodiments of the first aspect of the present application, the anchor rod further comprises anchor bars, and the anchor bars are arranged on the anchor plate.

According to any one of the preceding embodiments of the first aspect of the present application, the composite pile fan foundation further comprises a mattress layer, the mattress layer is disposed between the fan foundation and the precast pile, and the mattress layer covers at least a surface of the fan foundation adjacent to the precast pile.

According to any preceding embodiment of the first aspect of the application, the stock still includes the anticorrosive coating, and the anticorrosive coating sets up in the surface of the body of rod, and the anticorrosive coating keeps apart mattress layer and the body of rod at least.

An embodiment of the second aspect of the application provides a wind turbine generator, which comprises a wind turbine generator tower, a wind driven generator and the composite pile fan foundation of any one embodiment of the first aspect, wherein the wind driven generator, the wind turbine generator tower and the composite pile fan foundation are sequentially connected.

The composite pile fan foundation of this application embodiment utilizes the precast pile to consolidate the ground, takes the stock to connect precast pile and fan foundation simultaneously, and stock and precast pile play the resistance to plucking effect similar with rock stock basis, both utilize the precast pile to improve the ground bearing capacity, can improve the resistance to plucking ability on composite pile fan foundation again to can reduce the area on composite pile fan foundation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a composite pile wind turbine foundation according to an embodiment of the first aspect of the present application;

FIG. 2 is a schematic cross-sectional view of a wind turbine foundation of another composite pile according to an embodiment of the first aspect of the present application;

FIG. 3 is a schematic view of a partial cross-sectional structure of another composite pile wind turbine foundation according to an embodiment of the first aspect of the present application;

fig. 4 is a schematic partial sectional view of a wind turbine foundation of another composite pile according to an embodiment of the first aspect of the present application.

Description of reference numerals:

100. a composite pile fan foundation; 110. prefabricating a pile; 120. a fan foundation; 130. an anchor rod; 111. a first precast pile; 112. a second precast pile; A. a first region; B. a second region; 131. a rod body; 132. an anchor plate; 133. anchoring ribs; 134. an anticorrosive layer; 140. a mattress layer; 150. grouting a material; 131a, a first end portion; 131b, and a second end portion.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.

Wind energy, as a clean renewable energy source, is increasingly gaining attention from countries around the world, and the wind power generation industry is rapidly growing. The wind energy storage capacity is large and the distribution area is wide in China, the new energy strategy of China begins to set the rapid development of wind power generation as the key point, and the wind power industry has huge prospects. With the development of the wind power industry, the height of the onshore wind power tower and the single-machine capacity of the fan are gradually increased, and the load of the fan transmitted to the bottom of the tower is correspondingly greatly increased, so that the large-capacity unit puts higher requirements on the rigidity, the bearing capacity of a foundation and the stability of the foundation. In engineering project construction, under the condition of meeting the operation safety of a large unit, how to reduce the basic design area and meet project land acquisition limiting conditions becomes a key factor for smooth implementation of projects. The traditional gravity type fan foundation occupies a large area, the land acquisition cost of a project is high, and the project coordination is difficult; the traditional pile foundation has higher requirement on the bearing capacity of a single pile, longer pile length and high construction cost.

To solve the above problem, an embodiment of the first aspect of the present application provides a composite pile wind turbine foundation 100 for supporting a wind turbine tower on a non-rock stratum, and referring to fig. 1, the composite pile wind turbine foundation 100 includes a plurality of precast piles 110, a wind turbine foundation 120, and a plurality of anchor rods 130. The precast pile 110 is completely buried in the ground; the fan foundation 120 is arranged on one side of the precast pile 110, the fan foundation 120 is completely or partially embedded in the ground, and the fan foundation 120 is used for supporting a tower of the wind turbine; a plurality of anchor rods 130 are arranged between the fan foundation 120 and the precast piles 110, and the anchor rods 130 connect the fan foundation 120 and at least a part of the precast piles 110.

The non-rock stratum may be a stratum structure mixed by one or more of soft soil, common soil, hard soil, gravel hard soil and soft stone. Compared with a rock stratum structure, the non-rock stratum is soft in geology and easy to construct, but is insufficient in compressive strength and prone to sedimentation. The precast piles 110 are buried in the stratum, so that the precast piles 110 can reinforce the stratum in the range of the fan foundation 120, the compressive strength of the non-rock stratum is improved, and the stratum settlement is avoided to a certain extent. The precast pile 110 can bear large load, is firm and durable, the construction speed of the precast pile 110 is high, and the installation efficiency of the composite pile fan foundation is improved. The pile type and the pile length of the precast piles 110 are determined by the single-pile uplift resistance, and the arrangement distance among the precast piles 110 can be determined according to the technical regulation for building foundation treatment JGJ79-2012 and the bearing capacity of the composite foundation according to the design requirement. Alternatively, the precast pile 110 may be a concrete square pile, a prestressed concrete pipe pile, or the like. Pile sinking equipment may be used to drive, force or vibrate precast pile 110 into the earth.

The specification of the anchor rod 130 is determined by the pulling force transmitted to the precast pile by the fan foundation 120, and the length and the material of the anchor rod 130 are determined according to the rock anchor rod foundation calculation mode. The length of the anchor rod 130 extending into the fan foundation 120 meets the basic anchoring length and force transmission requirements.

The composite pile fan foundation 100 of this application embodiment utilizes precast pile 110 to consolidate the ground, takes stock 130 to connect precast pile 110 and fan foundation 120 simultaneously, and stock 130 and precast pile 110 play the resistance to plucking effect similar with rock stock basis, both utilize precast pile 110 to improve the ground bearing capacity, can improve composite pile fan foundation 100's resistance to plucking ability again to can reduce composite pile fan foundation 100's area.

In some embodiments, precast pile 110 includes first and second

precast piles

111, 112 arranged at intervals, and anchor rods 130 connected to second precast pile 112.

According to the site construction situation, the anchor rod 130 connects the partial precast pile 110 and the fan foundation 120 to meet the engineering requirements, and illustratively, the second precast pile 112 is arranged at a position with shallow underground water level or insufficient bearing capacity of a natural foundation, and the first precast pile 111 is arranged at other positions with sufficient bearing capacity. The second precast pile 112 is connected with the fan foundation 120 through the anchor rod 130, and the first precast pile 111 is not connected with the anchor rod 130 and only plays a role of reinforcing the foundation. Can save materials and reduce the construction cost under the requirement of ensuring the strength of the foundation.

Referring to fig. 2, in some embodiments, the first precast piles 111 are disposed at intervals in the first area a, and the second precast piles 112 are disposed at intervals in the second area B, which surrounds the first area a.

When the composite pile fan foundation 100 bears the load of the tower of the wind turbine generator, the outer ring of the composite pile fan foundation 100 and the stratum around the composite pile fan foundation 100 are most easily damaged. In order to improve the bearing capacity of the composite pile wind turbine foundation 100, the second precast pile 112 is arranged at the outer ring, and the first precast pile 111 is arranged at the inner ring.

In other embodiments, anchor 130 further includes a rod 131 and an anchor plate 132, the rod 131 including a first end 131a and a second end 131b, the anchor plate 132 being connected to the first end 131a and/or the second end 131 b.

The joints of the anchor rods 130 and the fan foundation 120 and the anchor rods 130 and the precast piles 110 are weak links of structural strength, and the concrete at the joints is easy to be locally damaged when receiving compressive stress due to low concrete strength. The rod 131 includes a first end 131a and a second end 131b, and illustratively, the first end 131a is connected to the wind turbine foundation 120, and the second end 131b is connected to the precast pile 110. The anchor plates 132 may be disposed at the first end 131a and the second end 131b of the anchor bar 130, and the anchor bar 130 is connected to the fan foundation 120 and the precast pile 110 through the anchor plates 132, so that when the fan foundation 120 is loaded, the anchor plates 132 may increase the stressed areas of the first end 131a and the second end 131b of the anchor bar 130, and uniformly transfer the transferred load, thereby avoiding local stress concentration. The anchor plate 132 may be disposed on one of the first end portion 131a and the second end portion 131b, or both the first end portion 131a and the second end portion 131b may be disposed with the anchor plate 132, so as to improve the structural strength more effectively. The thickness and width of the anchor plate 132 are determined according to the pullout force and localized pressure to which the anchor rod 130 is subjected.

Referring to fig. 3, in some embodiments, the precast pile 110 is a solid pile and the anchor plate 132 is attached to an end surface of the precast pile 110 proximate the wind turbine foundation 120.

Optionally, the solid pile is a solid concrete square pile, and a connection structure for connecting with the anchor plate 132 is arranged at one end of the solid pile close to the wind turbine foundation 120. For example, the precast pile 110 and the anchor plate 132 are connected by flanges, and the connection structure may be a top flange pre-embedded at one end of the precast pile 110 close to the fan foundation 120, and the precast pile 110 and the anchor plate 132 are fastened and connected by a high-strength screw and a flange. The flange has high connection strength and good sealing performance, and can meet the strength standard of a high-strength foundation.

In some embodiments, referring to fig. 4, the precast pile 110 is a pipe pile, the anchor plate 132 is disposed in the precast pile 110, and the composite pile fan foundation 100 further includes a grouting material 150 filled between the pipe pile and the anchor rod 130.

The tubular pile is hollow tubular. When the precast pile 110 is constructed and prepared, firstly, the tubular pile is buried in the ground, holes are cleared on the tubular pile, sludge in the tubular pile is cleaned, and water pump washing or slurry shovel dredging can be specifically adopted. Then the anchor rod 130 is placed in the pipe pile, the grouting material 150 is poured, and after the grouting material 150 is solidified, the grouting material 150 connects the pipe pile and the anchor rod 130. During pouring, vibration is needed to be done, so that the grouting material 150 is tightly combined, and the phenomena of honeycomb pitted surface and the like of the grouting material 150 are eliminated, so that the strength of the grouting material is improved. After the grouting material 150 was poured, the grouting material 150 was poured within 12 hours to maintain a sufficiently wet state. Alternatively, C40 non-shrink concrete may be used as the grouting material 150.

In some embodiments, referring to fig. 3, anchor bar 130 further includes anchor bars 133, and anchor bars 133 are disposed on anchor plate 132.

Anchor bars 133 are arranged on the anchor plates 132, and the anchor rods 130 are connected with the precast piles 110, the anchor rods 130 and the fan foundation 120 in an anchoring manner, so that the anchor rods can work together to bear various stresses, and the fan foundation 100 of the composite pile can be improved. The length of the anchor bars 133 is set according to actual conditions, the extending direction of the anchor bars 133 and the anchor plates 132 are arranged at an included angle, and optionally, the anchor bars 133 are arranged perpendicular to the anchor plates 132. The number of anchor bars 133 is not limited in this application and may be 2 or 4, or more. Alternatively, the anchor bars 133 and the anchor plates 132 may be welded.

In accordance with any of the previous embodiments of the first aspect of the present application, referring to fig. 1, the composite pile fan foundation 100 further includes a mattress layer 140, the mattress layer 140 is disposed between the fan foundation 120 and the precast pile 110, and the mattress layer 140 covers at least a surface of the fan foundation 120 adjacent to the precast pile 110.

A mattress layer 140 is arranged between the precast pile 110 and the fan foundation 120, so that the uniform stress of the pressure area of the fan foundation 120 can be guaranteed. The mattress layer 140 can ensure that the precast pile 110 and the ground layer bear loads together, and when the fan foundation 120 is subjected to vertical load, both the precast pile 110 and the ground layer deform. The modulus of the precast pile 110 is far larger than that of the stratum, the precast pile 110 deforms less than that of the stratum, and due to the fact that the mattress layer 140 with a certain thickness is arranged below the fan foundation 120, the precast pile 110 can be penetrated upwards, and along with the change process, the mattress layer 140 continuously supplements the stratum between the precast piles 110, so that a part of load is guaranteed to act on the stratum between the precast piles 110 through the mattress layer 140, and the combined action of the precast pile 110 and the stratum is achieved. The mattress layer 140 is made of non-weathered clean gravel or crushed stone, and optionally, the material can be medium sand, coarse sand, graded sand, etc. The mattress layer 140 is constructed by cleaning and leveling the base.

Referring to fig. 4, in some embodiments, the anchor 130 further includes a corrosion protection layer 134, the corrosion protection layer 134 being disposed on a surface of the rod 131, the corrosion protection layer 134 isolating at least the mattress layer 140 and the rod 131.

The anchor rods 130 are placed in the precast pile 110, mattress layer 140, and fan foundation 120, and rust is common after a certain period of time, particularly in the portion of the mattress layer 140. The rusting of the anchor rod 130 inevitably causes the strength of the anchor rod 130 to be reduced, and even causes accidents to occur. Therefore, in some embodiments, the anchor 130 further includes a corrosion protection layer 134, the corrosion protection layer 134 is disposed on the surface of the rod 131, the corrosion protection layer 134 at least isolates the mattress layer 140 from the rod 131, although the corrosion protection layer 134 may also isolate the rod 131, the anchor plate 132, the anchor bars 133, and the like. The corrosion-resistant layer 134 may be an alloy layer plated on the surface of the rod 131, and may also be anticorrosive resin or antirust paint, and optionally, the material of the corrosion-resistant layer 134 is epoxy resin.

An embodiment of a second aspect of the present application provides a wind turbine, including a wind turbine tower, a wind turbine, and the composite pile fan foundation 100 of any embodiment of the first aspect, where the wind turbine and the wind turbine tower are sequentially connected.

The wind turbine can convert kinetic energy of wind into mechanical kinetic energy, and then convert the mechanical energy into electric kinetic energy. And (3) installing a wind turbine generator, namely firstly arranging the composite pile fan foundation 100 of any embodiment of the first aspect, hoisting a tower of the wind turbine generator to be fixedly connected with the composite pile fan foundation 100, and then fixedly installing a wind driven generator at one end, far away from the composite pile fan foundation 100, of the tower of the wind turbine generator.

The foregoing is merely exemplary of the present application and is not intended to be exhaustive or to limit the invention to the precise form disclosed. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.

Claims

1. The utility model provides a compound pile fan foundation, compound pile fan foundation is used for supporting a wind turbine generator system tower section of thick bamboo on non-rock type stratum, its characterized in that includes:

a plurality of precast piles fully embedded in the formation;

the fan foundation is arranged on one side of the precast pile, is completely or partially embedded in the stratum and is used for supporting the tower drum of the wind turbine generator;

a plurality of stock, it is a plurality of the stock set up in fan basis and a plurality of between the precast pile, it is a plurality of the stock is connected fan basis and at least part the precast pile.

2. The composite pile fan foundation of claim 1, wherein the plurality of precast piles comprises a plurality of first precast piles arranged at intervals and a plurality of second precast piles arranged at intervals, and the anchor rods are connected with the second precast piles.

3. The composite pile wind turbine foundation of claim 2, wherein a plurality of the first pre-fabricated piles are spaced apart in a first area and a plurality of the second pre-fabricated piles are spaced apart in a second area, the second area surrounding the first area.

4. The composite pile fan foundation of claim 1, wherein the anchor rod further comprises a rod body including a first end and a second end and an anchor plate connected to the first end and/or the second end.

5. The composite pile fan foundation of claim 4, wherein the precast pile is a solid pile, and the anchor plate is connected with an end surface of the precast pile close to the fan foundation.

6. The composite pile fan foundation of claim 4, wherein the precast pile is a tubular pile, the anchor plate is disposed in the precast pile, and the composite pile fan foundation further comprises a grouting material filled between the tubular pile and the anchor rod.

7. The composite pile fan foundation of claim 4, wherein the anchor rods further comprise anchor bars, the anchor bars being disposed on the anchor plates.

8. The composite pile fan foundation of claim 4, further comprising a mattress layer disposed between the fan foundation and the precast pile, the mattress layer covering at least a surface of the fan foundation proximate the precast pile.

9. The composite pile fan foundation of claim 8, wherein the anchor rod further comprises an anti-corrosive layer disposed on a surface of the rod body, the anti-corrosive layer isolating at least the mattress layer and the rod body.

10. A wind turbine comprising a wind turbine tower, a wind turbine and a composite pile wind turbine foundation according to any one of claims 1-9, the wind turbine, the wind and the composite pile wind turbine tower wind turbine foundation being connected in series.