CN112922020A - Fan cylindrical foundation consisting of secant piles and construction method - Google Patents
Fan cylindrical foundation consisting of secant piles and construction method Download PDFInfo
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- CN112922020A CN112922020A CN202110263739.1A CN202110263739A CN112922020A CN 112922020 A CN112922020 A CN 112922020A CN 202110263739 A CN202110263739 A CN 202110263739A CN 112922020 A CN112922020 A CN 112922020A
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000004567 concrete Substances 0.000 claims description 18
- 230000002787 reinforcement Effects 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 abstract description 9
- 238000009412 basement excavation Methods 0.000 abstract description 7
- 238000005553 drilling Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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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)
Abstract
The invention relates to a fan cylindrical foundation consisting of secant piles and a construction method, wherein the fan cylindrical foundation comprises a reinforced concrete bearing platform and secant piles, the reinforced concrete bearing platform is connected with a fan tower barrel, the secant piles are embedded into the bottom surface of the reinforced concrete bearing platform and are connected into a whole, the secant piles are in a circular cylindrical shape, reinforced concrete guide walls which play a role in guiding and fixing during construction are arranged on the inner side and the outer side of the secant piles, the secant piles comprise a plurality of unit piles uniformly arranged along the circumference, and adjacent unit piles are mutually meshed. Compared with the prior art, the method can avoid the problem of damaging undisturbed soil during large excavation or open caisson construction, and has short construction period and good economical efficiency compared with the conventional pile foundation.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a fan cylindrical foundation consisting of secant piles and a construction method.
Background
Wind power generation is one of the most mature and most extensive development conditions and commercial development prospects in various renewable energy fields, and available wind energy is widely distributed and has huge reserves in the global scope. Meanwhile, with the continuous maturity of wind power related technologies and the continuous upgrading of equipment, the global wind power generation industry develops at a high speed.
According to the characteristics of geological conditions, onshore wind power foundations can be divided into gravity type extended foundations, beam slab extended foundations, rock anchor rod foundations, pile foundations and cylindrical foundations, wherein the cylindrical foundations have the characteristics of direct stress, full utilization of soil passive soil pressure to resist upper overturning load, high structural efficiency and the like.
The cylindrical foundation is usually constructed by a large excavation method and an open caisson construction method. For example, the construction equipment special for the muck pile invented by Sprahlung and the like adopts a large excavation construction method, and the assembled square-tube-shaped multi-layer concrete underground garage invented by Wangzhiling and the like adopts a sinking well construction method. The large excavation construction method has large excavation and backfilling engineering quantity, damages undisturbed soil and is difficult to excavate when the depth is large; the open caisson construction method is characterized in that a prefabricated cylindrical inner soil body is excavated, the barrel is controlled to sink uniformly, and the inner part of the barrel is backfilled.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cylindrical fan foundation consisting of secant piles and a construction method, which not only avoid the problem that undisturbed soil is damaged during large excavation or open caisson construction adopted by the conventional cylindrical fan foundation, but also have short construction period and good economy compared with the conventional pile foundation.
The purpose of the invention can be realized by the following technical scheme:
a fan cylindrical foundation consisting of secant piles comprises a reinforced concrete bearing platform and secant piles, wherein the reinforced concrete bearing platform is connected with a fan tower cylinder, the secant piles are embedded into the bottom surface of the reinforced concrete bearing platform and are connected into a whole, the secant piles are circular cylindrical, reinforced concrete guide walls which play a role in guiding and fixing during construction are arranged on the inner side and the outer side of the secant piles, the secant piles comprise a plurality of unit piles uniformly arranged along the circumference, and adjacent unit piles are mutually meshed.
Furthermore, one of two adjacent unit piles is a plain concrete pile, and the other is a reinforced concrete pile.
Further, the meshing width of the adjacent unit piles is 1/10-1/4 of the diameter of the unit piles.
Furthermore, the reinforced concrete bearing platform is connected with the fan tower barrel through a prestressed anchor bolt assembly.
Further, the prestressed anchor bolt assembly is provided with a plurality of prestressed anchor bolt assemblies.
Furthermore, a plain concrete cushion layer is arranged between the reinforced concrete bearing platform and the occlusive pile.
Further, the reinforced concrete guide wall is positioned at the end part of the occlusive pile close to the ground.
The invention also provides a construction method of the fan cylindrical foundation consisting of the secant piles, which comprises the following steps:
1) excavating and constructing a reinforced concrete guide wall, wherein one end of the reinforced concrete guide wall is buried underground, and the other end of the reinforced concrete guide wall is higher than the ground;
2) constructing each unit pile of the occlusive piles at intervals;
3) excavating a foundation pit of the reinforced concrete bearing platform, and removing a reinforced concrete guide wall within the depth range of the foundation pit;
4) and pouring a plain concrete cushion layer, installing the prestressed anchor bolt assembly, and constructing a construction reinforced concrete bearing platform connected with the fan tower.
Further, in the step 1), the reinforced concrete guide wall is at least 200mm higher than the ground.
Further, the step 2) is specifically as follows:
two adjacent unit piles are respectively called as an A pile and a B pile, a full casing drill is adopted to form a hole, and concrete is poured to form the A pile; and then, a full casing drill is adopted to form a hole, the pile A needs to be occluded, the pile reinforcement cage B needs to be installed, and concrete is poured to form the pile B.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the secant pile to form the cylindrical foundation, avoids the large excavation or open caisson construction adopted by the conventional cylindrical foundation, avoids the damage to undisturbed soil, and has small construction difficulty and small working face.
2. The reinforced concrete guide walls are arranged below the bottom surface of the bearing platform and on the inner side and the outer side of the secant pile, play a role in restraining the cylinder body formed by the secant pile and improve the bearing capacity of soil bodies inside and outside the cylinder body.
3. The secant pile is connected with the reinforced concrete bearing platform to form a cylindrical foundation with good integrity, and is very suitable for bearing loads which are transmitted by an upper fan and mainly take bending moment.
4. The invention adopts the full casing drilling machine to carry out occlusion hole forming, avoids the influence of slurry on the combination of adjacent piles, and has good integrity of the occluded pile.
5. For soft soil foundation with high underground water level, the cylindrical foundation formed by the occlusive piles has shorter construction period and better economical efficiency compared with the conventional pile foundation.
Drawings
FIG. 1 shows a cross-sectional view of a fan casing foundation made up of snap-piles according to the present invention;
FIG. 2 shows a top view of a fan bucket foundation comprised of snap-piles;
FIG. 3 shows a cross-sectional view of a bite pile;
description of reference numerals: 1. the concrete pile comprises a reinforced concrete bearing platform, 2, secant piles, 3, a reinforced concrete guide wall, 4, a plain concrete cushion layer, 5, a prestressed anchor bolt assembly, 6, piles A, 7, piles B, 8 and pile reinforcement cages B.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The embodiment provides a fan cylindrical foundation consisting of secant piles, and referring to fig. 1, the fan cylindrical foundation comprises a reinforced concrete bearing platform 1 and secant piles 2, wherein a prestressed anchor bolt assembly 5 is embedded in the reinforced concrete bearing platform 1 and connected with a fan tower; the secant pile 2 is embedded into the bottom surface of the reinforced concrete bearing platform 1 and connected into a whole, the secant pile 2 is in a circular cylinder shape, and reinforced concrete guide walls 3 which play a role in guiding and fixing during construction are arranged on the inner side and the outer side of the secant pile. Preferably, a reinforced concrete guide wall 3 is located at the end of the bite pile 2 near the ground.
As shown in fig. 2, in the present embodiment, the occluding pile 2 comprises a plurality of unit piles which are uniformly arranged along the circumference, and adjacent unit piles are occluded with each other. And one of the two adjacent unit piles is a plain concrete pile, and the other one is a reinforced concrete pile. The occlusion width of the adjacent unit piles is 1/10-1/4 of the diameter of the unit piles.
In some embodiments, the reinforced concrete cap 1 is cast in place of reinforced concrete with a plain concrete pad 4 between it and the bite pile 2. In this embodiment, the reinforced concrete bearing platform 1 includes a pier and a cantilever plate, and is connected with the wind turbine tower through the prestressed anchor bolt assembly 5.
In some embodiments, the prestressed anchor bolt assembly 5 may be provided in plurality, so as to improve the stability of the reinforced concrete bearing platform 1 and the wind turbine tower. In this embodiment, the pre-stressed anchor bolt assembly 5 includes an upper anchor plate, an anti-corrosion anchor bolt and a lower anchor plate, which are connected in sequence.
The construction method corresponding to the fan cylindrical foundation consisting of the secant piles provided by the embodiment comprises the following steps:
1) and (3) leveling the field, excavating and constructing the reinforced concrete guide wall 3, performing field lofting determination on the plane position of the foundation according to the coordinate value of the central point of the fan foundation, and burying one end of the reinforced concrete guide wall 3 underground, wherein the other end of the reinforced concrete guide wall is not less than 200mm higher than the ground. In this embodiment, the reinforced concrete guide wall 3 is 300mm higher than the ground, as shown in fig. 3.
2) Referring to fig. 2, adjacent ones of the unit piles of the spaced construction bite piles 2 are divided into a piles 6 and B piles 7. And (4) forming holes on the pile A6 by using a full-casing drilling machine, and then pouring concrete. And (3) forming holes on the B piles 7 by using a full-casing drilling machine, occluding the A piles for a certain width during hole forming, installing the B pile reinforcement cage 8, and pouring concrete.
3) And excavating a foundation pit of the reinforced concrete bearing platform 1, removing the reinforced concrete guide wall 3 within the depth range of the foundation pit, and reserving the reinforced concrete guide wall 3 below the reinforced concrete bearing platform 1.
4) And pouring a plain concrete cushion layer 4, installing a pre-stressed anchor bolt assembly 5, and constructing the reinforced concrete bearing platform 1.
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 draught fan cylindrical foundation consisting of the secant piles is characterized by comprising a reinforced concrete bearing platform (1) and the secant piles (2), wherein the reinforced concrete bearing platform (1) is connected with a draught fan tower cylinder, the secant piles (2) are embedded into the bottom surface of the reinforced concrete bearing platform (1) and are integrally connected, the secant piles (2) are in a circular cylindrical shape, reinforced concrete guide walls (3) which play a role in guiding and fixing during construction are arranged on the inner side and the outer side of the secant piles, the secant piles (2) comprise a plurality of unit piles which are uniformly arranged along the circumference, and adjacent unit piles are mutually meshed.
2. The draught fan cylindrical foundation consisting of snap-in piles as claimed in claim 1, wherein one of two adjacent unit piles is a plain concrete pile and the other is a reinforced concrete pile.
3. A wind turbine cylindrical foundation of claim 1, wherein the width of the bite of adjacent unit piles is 1/10-1/4 of the diameter of the unit pile.
4. A tubular foundation for wind turbines consisting of occlusive piles, as claimed in claim 1, wherein said reinforced concrete cap (1) is connected to the wind turbine tower by means of pre-stressed anchor bolt assemblies (5).
5. A draught fan cylindrical foundation consisting of a snap-in pile according to claim 4, wherein the pre-stressed anchor bolt assembly (5) is provided in plurality.
6. A wind turbine cylindrical foundation consisting of a spud according to claim 1, characterized in that a plain concrete cushion (4) is arranged between the reinforced concrete cap (1) and the spud (2).
7. A draught fan tubular foundation consisting of a spud according to claim 1, wherein the reinforced concrete guide wall (3) is located at the end of the spud (2) near the ground.
8. A method of constructing a barrel foundation for a wind turbine consisting of spuds according to any of claims 1 to 7, comprising the steps of:
1) excavating and constructing a reinforced concrete guide wall (3), wherein one end of the reinforced concrete guide wall (3) is buried underground, and the other end of the reinforced concrete guide wall is higher than the ground;
2) constructing each unit pile of the occlusive piles (2) at intervals;
3) excavating a foundation pit of the reinforced concrete bearing platform (1), and removing a reinforced concrete guide wall (3) within the depth range of the foundation pit;
4) pouring a plain concrete cushion layer (4), installing a pre-stressed anchor bolt assembly (5), and constructing a construction reinforced concrete bearing platform (1) connected with the fan tower barrel.
9. The construction method of a fan cylindrical foundation consisting of occlusive piles according to claim 8, wherein in the step 1), the reinforced concrete guide wall (3) is at least 200mm higher than the ground.
10. The construction method of the fan cylindrical foundation consisting of the occlusive piles according to claim 6, wherein the step 2) is specifically as follows:
two adjacent unit piles are respectively called an A pile (6) and a B pile (7), a full casing drill is adopted to form a hole, and concrete is poured to form the A pile (6); and then, a full casing drill is adopted to form a hole, the pile A (6) needs to be occluded during the hole forming, the pile B reinforcement cage (8) is installed, and concrete is poured to form the pile B (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110263739.1A CN112922020A (en) | 2021-03-11 | 2021-03-11 | Fan cylindrical foundation consisting of secant piles and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110263739.1A CN112922020A (en) | 2021-03-11 | 2021-03-11 | Fan cylindrical foundation consisting of secant piles and construction method |
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| CN112922020A true CN112922020A (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110263739.1A Pending CN112922020A (en) | 2021-03-11 | 2021-03-11 | Fan cylindrical foundation consisting of secant piles and construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898000A (en) * | 2021-11-17 | 2022-01-07 | 华能清能通榆电力有限公司 | Secant pile cylindrical fan foundation combined with construction guide wall structure and construction method |
| CN114086615A (en) * | 2021-12-17 | 2022-02-25 | 中国华能集团清洁能源技术研究院有限公司 | Construction method of tubular foundation of secant pile and bearing capacity detection method thereof |
| CN114108683A (en) * | 2021-12-10 | 2022-03-01 | 华能新能源盘州市风力发电有限公司 | Steel sheet pile cylindric fan basis |
| CN114134882A (en) * | 2021-11-12 | 2022-03-04 | 中国华能集团清洁能源技术研究院有限公司 | Wind power prefabricated sheet pile and application structure and construction method thereof |
| CN114150696A (en) * | 2021-12-03 | 2022-03-08 | 华能清能通榆电力有限公司 | Cast-in-situ bored pile and steel sheet pile combined cylindrical foundation structure and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400469A (en) * | 2011-08-02 | 2012-04-04 | 北京健安诚岩土工程有限公司 | Secant pile drum type foundation and construction method thereof |
| CN205152976U (en) * | 2015-11-17 | 2016-04-13 | 中国电建集团华东勘测设计研究院有限公司 | Marine precast concrete cushion cap wind turbine foundation |
| CN215211135U (en) * | 2021-03-11 | 2021-12-17 | 同济大学建筑设计研究院(集团)有限公司 | Fan cylindrical foundation consisting of secant piles |
-
2021
- 2021-03-11 CN CN202110263739.1A patent/CN112922020A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400469A (en) * | 2011-08-02 | 2012-04-04 | 北京健安诚岩土工程有限公司 | Secant pile drum type foundation and construction method thereof |
| CN205152976U (en) * | 2015-11-17 | 2016-04-13 | 中国电建集团华东勘测设计研究院有限公司 | Marine precast concrete cushion cap wind turbine foundation |
| CN215211135U (en) * | 2021-03-11 | 2021-12-17 | 同济大学建筑设计研究院(集团)有限公司 | Fan cylindrical foundation consisting of secant piles |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134882A (en) * | 2021-11-12 | 2022-03-04 | 中国华能集团清洁能源技术研究院有限公司 | Wind power prefabricated sheet pile and application structure and construction method thereof |
| CN114134882B (en) * | 2021-11-12 | 2023-11-07 | 中国华能集团清洁能源技术研究院有限公司 | Wind power prefabricated sheet pile, application structure thereof and construction method |
| CN113898000A (en) * | 2021-11-17 | 2022-01-07 | 华能清能通榆电力有限公司 | Secant pile cylindrical fan foundation combined with construction guide wall structure and construction method |
| CN114150696A (en) * | 2021-12-03 | 2022-03-08 | 华能清能通榆电力有限公司 | Cast-in-situ bored pile and steel sheet pile combined cylindrical foundation structure and construction method |
| CN114108683A (en) * | 2021-12-10 | 2022-03-01 | 华能新能源盘州市风力发电有限公司 | Steel sheet pile cylindric fan basis |
| CN114086615A (en) * | 2021-12-17 | 2022-02-25 | 中国华能集团清洁能源技术研究院有限公司 | Construction method of tubular foundation of secant pile and bearing capacity detection method thereof |
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