CN114592535A - Large-diameter tubular pile cylindrical fan foundation structure and construction method - Google Patents
Large-diameter tubular pile cylindrical fan foundation structure and construction method Download PDFInfo
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- CN114592535A CN114592535A CN202210277710.3A CN202210277710A CN114592535A CN 114592535 A CN114592535 A CN 114592535A CN 202210277710 A CN202210277710 A CN 202210277710A CN 114592535 A CN114592535 A CN 114592535A
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- pile
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- preformed hole
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- diameter tubular
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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
- E02D27/44—Foundations for machines, engines or ordnance
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/58—Prestressed concrete piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/72—Pile shoes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/24—Placing by using fluid jets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
Abstract
The invention discloses a large-diameter tubular pile cylindrical fan foundation structure and a construction method; the fan foundation structure comprises a large-diameter tubular pile, a pile shoe and a prestressed anchor cable; the pile shoe is connected to the bottom of the large-diameter tubular pile; the large-diameter tubular pile is provided with a plurality of tubular pile preformed holes which extend along the axial direction of the large-diameter tubular pile and are communicated, and the pile shoe is provided with a communicated pile shoe preformed hole which is communicated with the tubular pile preformed hole; the prestressed anchor cable is inserted into the pipe pile preformed hole and the pile shoe preformed hole; the bottom of the prestressed anchor cable is provided with an anchor plate; concrete is poured into the pipe pile preformed hole and the pile shoe preformed hole; the lower end of the prestressed anchor cable, the anchor plate, the lower part of the large-diameter tubular pile and the pile shoe are all anchored in the foundation. The invention adopts the structure that the large-diameter tubular pile and the prestressed anchor cable are matched, thereby avoiding the fatigue damage of the steel bar and the concrete, improving the crack resistance and the durability of the foundation structure and ensuring the safety of the foundation structure.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a large-diameter tubular pile cylindrical fan foundation structure for a soft soil foundation and a construction method.
Background
With the gradual clearness of targets determination and implementation paths of carbon peaking and carbon neutralization, the low-carbon transformation pace of energy in China is accelerated, renewable energy is rapidly developed, and wind power enters a larger-scale development and construction period. At present, areas with high wind speed and good wind resources have the condition of low price on-line, but the design of fan foundation selection, the construction difficulty and the construction period have decisive influence on the economy of wind power projects, and various projects near the balance point are gained and lost, even the loss is caused by the expense of foundation construction and the long construction period.
The fan foundation structure is an important supporting structure of the fan, and a bottom foundation generates large bending moment and horizontal thrust under the action of 360-degree reciprocating cyclic load such as long-term wind, wave and the like; for onshore wind power of soft soil foundation with lower foundation bearing capacity or offshore wind power of single-pile foundation of shallow soil of beach area and offshore shore, an economical and reasonable foundation design scheme is selected, the construction difficulty and cost are reduced, the stability and reliability of the wind turbine are improved, and the wind turbine is of great importance to the safety of the wind turbine.
At present, the wind turbine generator set foundation mostly adopts an occlusive pile cylindrical foundation, a prestressed pier type foundation and a prestressed cylindrical foundation; the pier-type foundation calculation scheme is adopted in a stress mode, the length is short, the soil body is easy to damage or interlock damage in the occlusion construction or large excavation construction process, and certain defects exist in the aspect of overall stress.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a cylindrical fan foundation structure with a large-diameter tubular pile and a construction method; the fan foundation structure is high in safety and good in crack resistance and durability; the construction method can overcome pile sinking resistance, reduce additional procedures such as foundation treatment and the like, improve construction progress, reduce construction cost and obtain a fan foundation structure with good stability and reliability.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a cylindrical fan foundation structure of a large-diameter tubular pile comprises the large-diameter tubular pile, a pile shoe and a prestressed anchor cable; the pile shoe is connected to the bottom of the large-diameter tubular pile; the large-diameter tubular pile is provided with a plurality of tubular pile preformed holes which extend along the axial direction of the large-diameter tubular pile and are communicated, and the pile shoe is provided with a communicated pile shoe preformed hole which is communicated with the tubular pile preformed hole; the prestressed anchor cable is inserted into the pipe pile preformed hole and the pile shoe preformed hole; the bottom of the prestressed anchor cable is provided with an anchor plate; concrete is poured into the pipe pile preformed hole and the pile shoe preformed hole; the lower end of the prestressed anchor cable, the anchor plate, the lower part of the large-diameter tubular pile and the pile shoe are all anchored in the foundation.
Furthermore, the large-diameter tubular pile is formed by splicing a plurality of pile rings.
Furthermore, two adjacent pile rings of the large-diameter tubular pile are spliced up and down through the concave-convex structure.
Furthermore, the diameter of the large-diameter tubular pile is 4-12 m, and the thickness of the tubular wall is more than 500 mm.
Further, the diameter of the tubular pile preformed hole and the diameter of the pile shoe preformed hole are both 260mm, and the circumferential distance between every two adjacent tubular pile preformed holes is 500-700 mm.
Furthermore, the cross section of each pile shoe is of a triangular structure, and the two adjacent pile shoe preformed holes are communicated through an inwards concave through groove.
The invention further provides a construction method of the large-diameter tubular pile cylindrical fan foundation structure, which comprises the following steps:
(1) driving a large-diameter tubular pile with a pile shoe connected to the bottom into a foundation;
(2) inserting a high-pressure water spray pipe into a certain pipe pile preformed hole of the large-diameter pipe pile, enabling the high-pressure water spray pipe to extend into a corresponding pile shoe preformed hole of a pile shoe, driving high-pressure water into the high-pressure water spray pipe, continuously spraying the high-pressure water below the pile shoe, cutting a soil body below the pile shoe, enabling sandy soil flushed by the high-pressure water to enter the adjacent pile shoe preformed holes through a through groove between the adjacent two pile shoe preformed holes, and sucking the sandy soil out of the pipe pile preformed holes by using a sand pump; sequentially operating corresponding to each pipe pile preformed hole according to the steps; in the process of pumping water and soil, the large-diameter pipe pile gradually sinks;
(3) after the large-diameter tubular pile and the pile shoe sink in place, removing the high-pressure water spray pipe and the sand pump, putting a prestressed anchor cable with an anchor plate at the bottom into each tubular pile preformed hole of the large-diameter tubular pile, and extending the lower end of the prestressed anchor cable out of the pile shoe preformed hole;
(4) pouring concrete into the pipe pile preformed hole and the pile shoe preformed hole;
(5) and after the concrete reaches a certain strength, tensioning the prestressed anchor cable to a control stress design value.
Furthermore, the diameter of the high-pressure water spraying pipe is 50-80 mm, and the water flow pressure is greater than 2 MPa.
Furthermore, the power of the sand pump is more than 20KW, and the flow is more than 50m3/h。
Further, in the step (5), when the strength of the concrete reaches 50% of the design strength, the prestressed anchor cable is tensioned.
The invention has the beneficial effects that:
the fan foundation structure adopts the large-diameter tubular pile with the annular structure, so that the manufacturing cost of a large-scale pile hammer can be reduced to a certain extent, and the pile hammer is not easy to damage in the process of driving into a foundation;
the large-diameter tubular pile is provided with the plurality of tubular pile preformed holes, the prestressed anchor cables are arranged in the tubular pile preformed holes, concrete is poured into the tubular pile preformed holes, and the large-diameter tubular pile is stressed by tensioning the prestressed anchor cables, so that the bearing capacity between a foundation and a fan foundation structure is improved.
The invention adopts the structure that the large-diameter tubular pile and the prestressed anchor cable are matched, thereby avoiding the fatigue damage of the steel bar and the concrete, improving the crack resistance and the durability of the foundation structure and ensuring the safety of the foundation structure.
The construction method comprises the steps of putting a high-pressure water pipe into a pipe pile preformed hole of a large-diameter pipe pile, flushing sand at a pile shoe by using water sprayed from the high-pressure water spraying pipe, and sucking the flushed sand from the adjacent pipe pile preformed hole by using a sand pump; the method for extracting the water and soil pile sinking cuts the soil layer at the bottom of the pile shoe by jetting water flow and extracts sand, thereby forming undercutting force, overcoming pile sinking resistance, facilitating the construction of a foundation structure more safely and reliably.
Drawings
Fig. 1 is a schematic structural view of a large-diameter tubular pile cylindrical fan foundation structure of the invention.
Fig. 2 is a partial enlarged structural schematic diagram of a pile shoe in a large-diameter tubular pile tubular wind turbine foundation structure.
Fig. 3 is a schematic view of the fitting structure between two adjacent pile rings of the large-diameter tubular pile of the present invention.
Fig. 4 is a top view of the large-diameter tubular pile cylindrical wind turbine foundation structure of the present invention.
Fig. 5 is a schematic structural diagram of the construction process of the large-diameter tubular pile cylindrical fan foundation structure of the invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
A large-diameter tubular pile cylindrical wind turbine foundation structure as shown in fig. 1 to 4, which comprises a large-diameter tubular pile 1, a pile shoe 2 and a prestressed anchor cable 3; the pile shoe 2 is of an annular structure and is connected to the bottom of the large-diameter tubular pile 1; the large-diameter tubular pile 1 is of an annular structure, at least 8 tubular pile preformed holes 11 which extend along the axial direction of the large-diameter tubular pile and are communicated with each other are formed in the annular wall, a communicated pile shoe preformed hole 21 is formed in the pile shoe 2, and the pile shoe preformed hole 21 is directly communicated with the tubular pile preformed hole 11; the prestressed anchor cable 3 is inserted into the pipe pile preformed hole 11 and the pile shoe preformed hole 21; the bottom of the prestressed anchor cable 3 is provided with an anchor plate 31; concrete 4 (fine stone concrete not less than C40) is poured into the pipe pile preformed hole 11 and the pile shoe preformed hole 21; the lower end of the prestressed anchor cable 3, the anchor plate 31, the lower part of the large-diameter tubular pile 1 and the pile shoe 2 are anchored in the foundation 5.
The large-diameter tubular pile 1 is of a reinforced concrete structure, the diameter of the large-diameter tubular pile is 4-12 m, and the thickness of the tubular wall is more than 500 mm.
As shown in fig. 3, the large-diameter tubular pile 1 is formed by splicing a plurality of pile rings 12, the height of each pile ring 12 is about 3m, and two adjacent pile rings 12 are spliced up and down through a concave-convex structure 13.
The diameter of the tubular pile preformed hole 11 and the pile shoe preformed hole 21 is 260mm, and the circumferential distance between two adjacent tubular pile preformed holes 11 is 500-700 mm.
The section of the pile shoe 2 is a triangular structure, and two adjacent pile shoe preformed holes 21 are communicated through an inwards concave through groove 22. The diameter of the through groove 22 is not less than 100 mm.
As shown in fig. 4, the construction method of the large-diameter tubular pile cylindrical fan foundation structure includes the following steps:
(1) driving a large-diameter tubular pile 1 with a pile shoe 2 connected to the bottom into a foundation 5;
(2) inserting a high-pressure water spray pipe 6 into a certain pipe pile preformed hole 11 of a large-diameter pipe pile 1, enabling the high-pressure water spray pipe 6 to extend into a corresponding pile shoe preformed hole 21 of a pile shoe 2, driving high-pressure water into the high-pressure water spray pipe 6, continuously spraying the high-pressure water below the pile shoe 2 to cut a soil body below the pile shoe 2, enabling sandy soil washed away by the high-pressure water to enter adjacent pile shoe preformed holes 21 through a through groove 22 between every two adjacent pile shoe preformed holes 21, and sucking the sandy soil out of the pipe pile preformed hole 11 by using a sand pump 7; sequentially operating corresponding to each pipe pile preformed hole 11 according to the steps; in the process of extracting water and soil, the large-diameter tubular pile 1 gradually sinks;
(3) after the large-diameter tubular pile 1 and the pile shoe 2 sink to the right position, removing the high-pressure water spray pipe 6 and the sand pump 7, putting a prestressed anchor cable 3 with an anchor plate 31 at the bottom into each tubular pile preformed hole 11 of the large-diameter tubular pile 1, and extending the lower end of the prestressed anchor cable 3 out of the pile shoe preformed hole 21;
(4) pouring concrete into the pipe pile preformed hole 11 and the pile shoe preformed hole 21;
(5) and when the strength of the concrete reaches 50% of the design strength, tensioning the prestressed anchor cable 3 to a control stress design value.
The diameter of the high-pressure water spraying pipe 6 is 50-80 mm, the wall thickness is not less than 2mm, and the water flow pressure is greater than 2 MPa.
Wherein the power of the sand pump 7 is more than 20KW, and the flow is more than 50m3/h。
The invention adopts the structure that the large-diameter tubular pile 1 is matched with the prestressed anchor cable 3, thereby avoiding the fatigue damage of the steel bar and the concrete, improving the crack resistance and the durability of the foundation structure and ensuring the safety of the foundation structure.
The construction method of the invention is that a high-pressure water pipe 6 is put into a pipe pile preformed hole 11 of a large-diameter pipe pile 1, sand at a pile shoe 2 is flushed by water sprayed by the high-pressure water spray pipe 6, and the flushed sand is sucked out from the adjacent pipe pile preformed hole 11 by a sand pump 7; according to the method for extracting the water-soil pile sinking, the soil layer at the bottom of the pile shoe 2 is cut by water jet, and sandy soil is extracted, so that the undercutting force is formed, the pile sinking resistance can be overcome, the construction of a foundation structure can be completed more safely and reliably, compared with the manual excavation of a conventional open caisson foundation, additional processes such as foundation treatment are omitted, the construction progress can be ensured, the economy is better, the soil body is not easy to damage, and the reliability and the stability of the whole stress are improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a cylindric fan foundation structure of major diameter tubular pile which characterized in that: the large-diameter pile comprises a large-diameter pipe pile, a pile shoe and a prestressed anchor cable; the pile shoe is connected to the bottom of the large-diameter tubular pile; the large-diameter tubular pile is provided with a plurality of tubular pile preformed holes which extend along the axial direction of the large-diameter tubular pile and are communicated, and the pile shoe is provided with a communicated pile shoe preformed hole which is communicated with the tubular pile preformed hole; the prestressed anchor cable is inserted into the pipe pile preformed hole and the pile shoe preformed hole; the bottom of the prestressed anchor cable is provided with an anchor plate; concrete is poured into the pipe pile preformed hole and the pile shoe preformed hole; the lower end of the prestressed anchor cable, the anchor plate, the lower part of the large-diameter tubular pile and the pile shoe are all anchored in the foundation.
2. The tubular fan foundation structure of large-diameter tubular pile according to claim 1, characterized in that: the large-diameter tubular pile is formed by splicing a plurality of pile rings.
3. The cylindrical fan foundation structure of large-diameter tubular pile according to claim 2, characterized in that: two adjacent pile rings of the large-diameter tubular pile are vertically spliced through the concave-convex structure.
4. The tubular fan foundation structure of large-diameter tubular pile according to claim 1, characterized in that: the diameter of the large-diameter tubular pile is 4-12 m, and the thickness of the tubular wall is more than 500 mm.
5. The cylindrical fan foundation structure of large-diameter tubular pile according to claim 1, characterized in that: the diameter of the tubular pile preformed hole and the diameter of the pile shoe preformed hole are both 260mm, and the circumferential distance between every two adjacent tubular pile preformed holes is 500-700 mm.
6. The tubular fan foundation structure of large-diameter tubular pile according to claim 1, characterized in that: the cross section of the pile shoe is of a triangular structure, and the two adjacent pile shoe preformed holes are communicated through an inwards concave through groove.
7. A construction method of a large-diameter tubular pile cylindrical fan foundation structure as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
(1) driving a large-diameter tubular pile with a pile shoe connected to the bottom into a foundation;
(2) inserting a high-pressure water spray pipe into a certain pile tube preformed hole of a large-diameter pipe pile, enabling the high-pressure water spray pipe to extend into a corresponding pile shoe preformed hole of a pile shoe, driving high-pressure water into the high-pressure water spray pipe, continuously spraying the high-pressure water below the pile shoe, cutting a soil body below the pile shoe, enabling sandy soil flushed by the high-pressure water to enter the adjacent pile shoe preformed hole through a through groove between the adjacent two pile shoe preformed holes, and sucking out the sandy soil from the pile shoe preformed hole by using a sand pump; sequentially operating corresponding to each pipe pile preformed hole according to the steps; in the process of pumping water and soil, the large-diameter pipe pile gradually sinks;
(3) after the large-diameter tubular pile and the pile shoe sink in place, removing the high-pressure water spray pipe and the sand pump, putting a prestressed anchor cable with an anchor plate at the bottom into each tubular pile preformed hole of the large-diameter tubular pile, and extending the lower end of the prestressed anchor cable out of the pile shoe preformed hole;
(4) pouring concrete into the pipe pile preformed hole and the pile shoe preformed hole;
(5) and after the concrete reaches a certain strength, tensioning the prestressed anchor cable to a control stress design value.
8. The construction method of the large-diameter tubular pile cylindrical fan foundation structure according to claim 7, wherein the diameter of the high-pressure water spraying pipe is 50-80 mm, and the water flow pressure is greater than 2 MPa.
9. The construction method of the large-diameter tubular pile cylindrical fan foundation structure according to claim 7, wherein the power of the sand pump is more than 20KW, and the flow rate is more than 50m3/h。
10. The construction method of the large-diameter tubular pile cylindrical fan foundation structure as claimed in claim 7, wherein the prestressed anchor cables are tensioned when the strength of concrete reaches 50% of the design strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277710.3A CN114592535A (en) | 2022-03-21 | 2022-03-21 | Large-diameter tubular pile cylindrical fan foundation structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277710.3A CN114592535A (en) | 2022-03-21 | 2022-03-21 | Large-diameter tubular pile cylindrical fan foundation structure and construction method |
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| CN114592535A true CN114592535A (en) | 2022-06-07 |
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| CN202210277710.3A Pending CN114592535A (en) | 2022-03-21 | 2022-03-21 | Large-diameter tubular pile cylindrical fan foundation structure and construction method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009019448A (en) * | 2007-07-13 | 2009-01-29 | Eto Construction Industry Co Ltd | Tip widening structure of steel pipe pile, and tip widening method of steel pipe pile |
| CN108842798A (en) * | 2018-06-27 | 2018-11-20 | 上海城建市政工程（集团）有限公司 | A kind of static pressure sinking construction method of prefabricated after-pouring formula open caisson |
| CN111636467A (en) * | 2020-06-27 | 2020-09-08 | 同济大学建筑设计研究院(集团)有限公司 | Prestressed cylinder type open caisson fan foundation and construction method |
-
2022
- 2022-03-21 CN CN202210277710.3A patent/CN114592535A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009019448A (en) * | 2007-07-13 | 2009-01-29 | Eto Construction Industry Co Ltd | Tip widening structure of steel pipe pile, and tip widening method of steel pipe pile |
| CN108842798A (en) * | 2018-06-27 | 2018-11-20 | 上海城建市政工程（集团）有限公司 | A kind of static pressure sinking construction method of prefabricated after-pouring formula open caisson |
| CN111636467A (en) * | 2020-06-27 | 2020-09-08 | 同济大学建筑设计研究院(集团)有限公司 | Prestressed cylinder type open caisson fan foundation and construction method |
Non-Patent Citations (1)
| Title |
|---|
| 曹志军等: "《三峡库区桥梁深水桩基础关键技术研究》", 西南交通大学出版社 * |
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