CN112814016A - Biconical land fan foundation - Google Patents
Biconical land fan foundation Download PDFInfo
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- CN112814016A CN112814016A CN202110168982.5A CN202110168982A CN112814016A CN 112814016 A CN112814016 A CN 112814016A CN 202110168982 A CN202110168982 A CN 202110168982A CN 112814016 A CN112814016 A CN 112814016A
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- 239000004567 concrete Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 13
- 230000007547 defect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Foundations (AREA)
- Wind Motors (AREA)
Abstract
本发明涉及一种双锥形陆上风机基础，包括相连接的柱墩和悬挑板，所述悬挑板上下表面均呈锥形，下表面锥形的坡度大于上表面锥形的坡度。与现有技术相比，本发明双锥形基础容易振捣密实，克服了正锥形基础在这方面的问题；当基础水平投影面积和荷载取值相同时，双锥形基础比正锥形基础沉降量小，且双锥形基础底面为斜面，与土体接触面积比正锥形基础更大；双锥形基础处于三向受压状态，抵消基础内部拉应力，受力较为有利。
The invention relates to a foundation for a double-cone onshore fan, comprising a column pier and a cantilever plate connected to each other. Compared with the prior art, the biconical foundation of the present invention is easy to vibrate and compact, and overcomes the problem of the forward conical foundation in this respect; when the horizontal projected area of the foundation and the load are the same, the biconical foundation is more efficient than the forward conical foundation. The settlement of the foundation is small, and the bottom surface of the biconical foundation is inclined, and the contact area with the soil is larger than that of the positive conical foundation; the biconical foundation is in a state of three-way compression, which offsets the internal tensile stress of the foundation, and the force is more favorable.
Description
Technical Field
The invention relates to the technical field of land fan structures, in particular to a biconical land fan foundation.
Background
Wind power generation is the most promising mode of scale development and commercial development in various renewable energy utilization technologies, is an important national green energy investment project and plays an important role in national economic development.
At present, according to geological condition characteristics, onshore wind power foundation forms can be divided into a gravity type extended foundation, a rock anchor rod foundation, a pile foundation and a beam-slab foundation, wherein the gravity type extended foundation and the pile foundation are mainly adopted, and the two foundation forms have the characteristics of stable stress, simplicity in construction and wide application range.
The conventional form of the existing pile foundation is a forward cone, and the section distribution of the pile foundation is closer to a bending moment diagram of a foundation cantilever plate under the action of foundation reaction force; however, the development direction of the fan is that the capacity of a single machine is increased, the economic requirement is improved, along with the increase of the diameter of a wind wheel and the increase of the height of a tower, the foundation load is increased, but the total concrete amount is not increased in the same proportion, the thickness of the root part of a foundation cantilever plate is increased, the thickness of the edge of the foundation cantilever plate is reduced during design, and the slope of the upper surface of the cantilever plate is increased more and more. The larger gradient makes the concrete not easy to vibrate and compact during construction, the face-closing difficulty is larger, and construction quality defects such as construction joints, honeycomb holes, temperature shrinkage cracks and the like often occur on the slope and the column pier.
Disclosure of Invention
The invention aims to overcome the problems of the conventional forward conical pile foundation, provides a biconical land fan foundation which is simple in construction and reasonable in stress and is suitable for a pile foundation.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a biconical land fan basis, includes biconical basis, and this biconical basis is including the pier and the board of encorbelmenting that are connected, the board upper and lower surface of encorbelmenting all is the toper.
In an alternative embodiment, the slope of the taper of the lower surface of the cantilever plate is greater than the slope of the taper of the upper surface.
In an optional embodiment, the slope of the upper surface taper of the cantilever plate is 5-10 °, and the slope of the lower surface taper is 25-30 °.
In an alternative embodiment, the area of the bottom surface of the cantilever plate is equal to the area of the cross section of the pier.
In an optional embodiment, the double-cone-shaped foundation further comprises a plain concrete cushion layer positioned at the bottom of the double-cone-shaped foundation, and a concrete cushion layer is arranged between the plain concrete cushion layer and the double-cone-shaped foundation.
In an alternative embodiment, a groove for arranging the concrete cushion is formed in the middle of the plain concrete cushion.
In an alternative embodiment, the double conical foundation is a reinforced concrete cast-in-place structure.
In an alternative embodiment, the double-cone-shaped land wind turbine foundation further comprises a pre-stressed anchor bolt assembly penetrating the double-cone-shaped foundation and exerting a pre-stress between the upper surface and the lower surface of the double-cone-shaped foundation.
In an optional embodiment, a high-strength grouting material is further arranged between the prestressed anchor bolt assembly and the upper surface of the biconical foundation.
In an alternative embodiment, the biconical onshore wind turbine foundation is a pile foundation and further comprises piles, a plurality of the piles are uniformly arranged along the circumference, and the piles are embedded into the biconical foundation.
In an alternative embodiment, the length of the peg embedded in the biconical base is 50-100 mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention improves the construction quality and ensures the bearing capacity strength of the structure. Compared with the prior art, the biconical foundation is easier to construct, is easy to vibrate compactly, can reduce the defects that the concrete in the traditional positive tapered pile foundation is difficult to vibrate compactly and the face collecting difficulty is large because of the larger gradient, and the construction quality defects such as construction joints, honeycomb holes and temperature contraction cracks appear on slope surfaces and column piers.
(2) The invention saves the consumption of concrete. The edge of the cantilever plate of the biconical foundation can be made very thin, the bottom of the cantilever plate is provided with a slope, if the edge thickness is 0.5-1 m, the bottom slope is 25-30 degrees, the foundation volume is smaller, and therefore the concrete use amount is reduced.
(3) The invention has smaller basic sedimentation amount. When the horizontal projection area and the load value of the foundation are the same, the bottom surface of the biconical foundation is an inclined surface, the contact area with the soil body is larger, and the settlement amount of the foundation can be reduced.
(4) The invention has more reasonable stress. Due to the horizontal component force added by the bottom inclined plane, the biconical foundation is in a three-way pressed state in the soil body, the tensile stress in the foundation is offset, and the stress characteristic that the compression resistance of concrete is stronger than the tensile resistance can be fully exerted.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a bottom view of the present invention;
FIG. 3 is a side view of the present invention;
FIG. 4 is a schematic view of the component assembly of the double conical foundation of the present invention;
FIG. 5 is a schematic sectional view taken along line A-A of FIG. 3;
description of reference numerals: 1. a biconical onshore wind power foundation; 2. piling; 3. a plain concrete cushion; 4. a conical foundation pit; 5. a biconical base; 11. a cantilever plate; 12. pillar piers; 13. a pre-stressed anchor bolt assembly; 14. high-strength grouting material; 15. a concrete cushion; 21. a first ring of piles; 22. a second circle of piles; 23. and (6) piling in a third circle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present embodiment provides a biconical onshore wind turbine foundation 1, which includes a biconical foundation 5, where the biconical foundation 5 includes a pillar 12 and a cantilever plate 11 connected to each other, an upper surface and a lower surface of the cantilever plate 11 are both conical, and a slope of the conical lower surface is greater than a slope of the conical upper surface. This 1 lower surface of fan basis is great domatic, and the upper surface remains less slope, and the surface construction degree of difficulty about the balance to avoid the quality defect because of the big appearance of the surface construction degree of difficulty, can also practice thrift the concrete volume simultaneously, reduce basic settlement volume, make the basis atress more reasonable.
The structure adopts a biconical foundation and has the following characteristics: firstly, the biconical foundation is easy to vibrate and compact, and the problem of the positive conical foundation in this respect is solved; secondly, when the horizontal projection area and the load value of the foundation are the same, the sedimentation amount of the biconical foundation is smaller than that of the positive conical foundation, the bottom surface of the biconical foundation is an inclined surface, and the contact area with the soil body is larger than that of the positive conical foundation; in addition, the biconical foundation is in a three-dimensional pressed state (the bottom inclined plane increases horizontal component force), so that the internal tensile stress of the foundation is counteracted, and the stress is more favorable.
In an alternative embodiment, the slope of the upper surface taper of the cantilever plate 11 is 5 ° to 10 °, and the slope of the lower surface taper is 25 ° to 30 °.
The edge of the cantilever plate 11 can be made to be very thin so as to save the concrete consumption, when the horizontal projection area and the load of the foundation are the same, the bottom surface of the biconical foundation 5 is an inclined surface, the contact area with the soil body is larger than that of the positive conical foundation, and the settlement of the biconical foundation 5 is smaller than that of the positive conical foundation. Optionally, the thickness of the edge of the cantilever plate 11 is 0.5m to 1 m.
The area of the bottom surface of the cantilever plate 11 is equal to the area of the cross section of the pier 12.
In an alternative embodiment, the double-cone-shaped land wind turbine foundation 1 further comprises a plain concrete cushion layer 3 laid at the bottom of the double-cone-shaped foundation 5, and a concrete cushion layer 15 is arranged between the plain concrete cushion layer 3 and the double-cone-shaped foundation 5. In one embodiment, the plain concrete cushion layer 3 is formed with a groove in the middle for disposing the concrete cushion layer 15, and the thickness of the concrete cushion layer 15 is 250 mm.
In an alternative embodiment, the double conical foundation 5 is a reinforced concrete cast-in-place structure.
Preferably, the wind turbine generator further comprises a pre-stressed anchor bolt assembly 13 penetrating through the double-cone-shaped foundation 5, wherein pre-stress is applied to the upper surface and the lower surface of the double-cone-shaped foundation 5 by the pre-stressed anchor bolt assembly 13, a high-strength grouting material 14 is arranged between the upper surface and the pre-stressed anchor bolt assembly 13, and the upper portion of the pre-stressed anchor bolt assembly 13 is used for being connected with a wind turbine tower.
The biconical land wind turbine foundation is suitable for a biconical foundation of a pile foundation. In one embodiment, the double-cone land wind turbine foundation is a pile foundation, and further comprises piles 2, a plurality of piles 2 are uniformly arranged along the circumference, and the piles 2 are embedded into the lower end of the double-cone foundation 5. Preferably, the length of the pile 2 embedded in the biconical foundation 5 is 50-100 mm.
In one embodiment, the piles 2 are three circles of piles evenly distributed along the circumference, including a number of first circles of piles 21 evenly distributed along the circle, a number of second circles of piles 22 evenly distributed along the circle, and a number of third circles of piles 23 evenly distributed along the circle.
The construction method of the biconical land wind turbine foundation comprises the following steps:
A. firstly, leveling a site according to the nature of the site to be built, and then excavating a conical foundation pit 4, wherein the conical foundation pit 4 is an excavated foundation pit matched with the shape of the lower surface of the conical foundation pit 5 according to the shape characteristics of the conical foundation pit. The position of the foundation plane is determined by field lofting according to the coordinate value of the central point of the fan foundation, the reserved 30cm above the excavated foundation surface is excavated manually before concrete pouring, and the foundation surface foundation is tamped and leveled to perform pile foundation engineering.
B. The piles 2 are symmetrically arranged from the middle to the periphery.
C. After the pile foundation engineering is finished, the floating soil and the disturbing stones at the bottom of the foundation pit are cleaned, the cable pipes are embedded in advance, and then the plain concrete cushion layer 3 is poured.
D. And after the plain concrete cushion layer 3 is poured, processing and installing the reinforcing steel bars in the foundation, installing the prestressed anchor bolt assembly 13, adjusting the levelness and the verticality of the anchor bolt assembly to be qualified, and pouring a 250mm concrete cushion layer 15 at the bottom.
E. After the concrete cushion 15 is poured, a concrete pouring template of the biconical foundation 5 is built, the concrete pouring of the biconical foundation 5 is carried out, layered continuous pouring is adopted, the thickness of the layer is not more than the maximum effective thickness of vibration, vibration is carried out on key parts such as circumferential adjacent anchor bolt gaps, and the concrete is maintained. And 7 days after the pouring of the concrete of the biconical foundation 5 is finished, carrying out high-strength grouting material 14 construction. And after the concrete is demolded, backfilling the part below the ground.
F. And (3) hoisting construction is carried out after the concrete strength of the biconical foundation 5 reaches 100% and the high-strength grouting material 14 is maintained to reach the strength, anchor bolts are tensioned to design pretension force, and the biconical wind power foundation is integrally built.
The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a biconical land fan basis which characterized in that, includes biconical basis (5), and this biconical basis (5) are including pier (12) and the board of encorbelmenting (11) that are connected, the upper and lower surface of board of encorbelmenting (11) all is the toper.
2. The double-tapered land wind turbine foundation of claim 1, wherein the slope of the lower surface taper of the cantilever plate (11) is greater than the slope of the upper surface taper.
3. The biconical onshore wind turbine foundation according to claim 1 or 2, wherein the slope of the upper surface taper of the cantilever plate (11) is 5 ° to 10 °, and the slope of the lower surface taper is 25 ° to 30 °.
4. The double-tapered land wind turbine foundation of claim 1, wherein the underside area of the cantilever plate (11) is equal to the cross-sectional area of the pier (12).
5. The double-cone land wind turbine foundation of claim 1, further comprising a plain concrete cushion (3) at the bottom of the double-cone foundation (5), wherein a concrete cushion (15) is arranged between the plain concrete cushion (3) and the double-cone foundation (5).
6. Double-tapered land wind turbine foundation according to claim 5, characterized in that the plain concrete underlayment (3) is formed with a groove in the middle for the placement of the concrete underlayment (15).
7. The double-cone onshore wind turbine foundation of claim 1, wherein said double-cone foundation (5) is a reinforced concrete cast-in-place structure.
8. The double-tapered land wind turbine foundation of claim 1, further comprising a pre-stressed anchor assembly (13) penetrating the double-tapered foundation (5) and applying a pre-stress between upper and lower surfaces of the double-tapered foundation (5).
9. The biconical land wind turbine foundation of claim 8, wherein a high-strength grouting material (14) is further arranged between the prestressed anchor bolt assembly (13) and the upper surface of the biconical foundation (5).
10. The double-tapered land wind turbine foundation according to claim 1, further comprising piles (2), wherein a plurality of the piles (2) are uniformly arranged along the circumference, and the piles (2) are embedded in the double-tapered land wind turbine foundation (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110168982.5A CN112814016B (en) | 2021-02-07 | 2021-02-07 | A double-conical onshore wind turbine foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110168982.5A CN112814016B (en) | 2021-02-07 | 2021-02-07 | A double-conical onshore wind turbine foundation |
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| Publication Number | Publication Date |
|---|---|
| CN112814016A true CN112814016A (en) | 2021-05-18 |
| CN112814016B CN112814016B (en) | 2025-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110168982.5A Active CN112814016B (en) | 2021-02-07 | 2021-02-07 | A double-conical onshore wind turbine foundation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115125987A (en) * | 2022-07-11 | 2022-09-30 | 天津大学 | Land wind power foundation structure with capacity expansion capability and capacity expansion construction method thereof |
| CN116290069A (en) * | 2023-03-30 | 2023-06-23 | 上海电力设计院有限公司 | Concrete tower foundation, foundation construction method and wind power generation equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202672174U (en) * | 2012-04-11 | 2013-01-16 | 中国电力工程顾问集团西北电力设计院 | Cone-shaped upright foundation of frozen soil region |
| CN102936901A (en) * | 2012-10-30 | 2013-02-20 | 广东明阳风电产业集团有限公司 | Wind power tower foundation combined with inverted cone and independent column |
| CN206308701U (en) * | 2016-11-01 | 2017-07-07 | 山东科技大学 | A kind of important actor back taper basis high |
| CN111395381A (en) * | 2020-03-25 | 2020-07-10 | 丁红岩 | Rotary pile raft type apron board foundation and construction method thereof |
| CN216156614U (en) * | 2021-02-07 | 2022-04-01 | 同济大学建筑设计研究院(集团)有限公司 | Biconical land fan foundation |
-
2021
- 2021-02-07 CN CN202110168982.5A patent/CN112814016B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202672174U (en) * | 2012-04-11 | 2013-01-16 | 中国电力工程顾问集团西北电力设计院 | Cone-shaped upright foundation of frozen soil region |
| CN102936901A (en) * | 2012-10-30 | 2013-02-20 | 广东明阳风电产业集团有限公司 | Wind power tower foundation combined with inverted cone and independent column |
| CN206308701U (en) * | 2016-11-01 | 2017-07-07 | 山东科技大学 | A kind of important actor back taper basis high |
| CN111395381A (en) * | 2020-03-25 | 2020-07-10 | 丁红岩 | Rotary pile raft type apron board foundation and construction method thereof |
| CN216156614U (en) * | 2021-02-07 | 2022-04-01 | 同济大学建筑设计研究院(集团)有限公司 | Biconical land fan foundation |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115125987A (en) * | 2022-07-11 | 2022-09-30 | 天津大学 | Land wind power foundation structure with capacity expansion capability and capacity expansion construction method thereof |
| CN115125987B (en) * | 2022-07-11 | 2024-06-11 | 天津大学 | Land wind power foundation structure with capacity expansion capability and capacity expansion construction method thereof |
| CN116290069A (en) * | 2023-03-30 | 2023-06-23 | 上海电力设计院有限公司 | Concrete tower foundation, foundation construction method and wind power generation equipment |
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| CN112814016B (en) | 2025-04-08 |
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