CN113338365B - Reinforced structure of onshore fan expanded foundation pipe pile and construction method - Google Patents
Reinforced structure of onshore fan expanded foundation pipe pile and construction method Download PDFInfo
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- CN113338365B CN113338365B CN202110714910.6A CN202110714910A CN113338365B CN 113338365 B CN113338365 B CN 113338365B CN 202110714910 A CN202110714910 A CN 202110714910A CN 113338365 B CN113338365 B CN 113338365B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
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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
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Piles And Underground Anchors (AREA)
Abstract
The invention belongs to the technical field of foundation reinforcement of wind generating sets and discloses a reinforced structure of an onshore fan expanded foundation pipe pile and a construction method; the structure comprises a fan foundation original structure, wherein the fan foundation original structure comprises a concrete structure and an anchor bolt assembly arranged in the concrete structure; the local pressure resistant grouting body is arranged below the top of the anchor bolt assembly; the concrete structure outside is bored there is even hole, the hole bottom is handled through enlarging the hole, be equipped with the stress tube stake in the hole, the hole between stress tube stake and the hole is handled through the grout and is formed the bonding grout body. The invention anchors the prestressed pipe pile into the rock-soil body through drilling, and forms the concrete anchoring end head and the concrete expanded end head through grouting treatment, and the concrete anchoring end head and the concrete expanded end head jointly resist the load transferred from the upper part by generating larger pulling resistance.
Description
Technical Field
The invention belongs to the technical field of foundation reinforcement of wind generating sets, and particularly relates to a reinforced structure of an onshore fan expanded foundation pipe pile and a construction method.
Background
The installed capacity of wind power projects in China is continuously increased, the fan type tends to be large-scale, and 3.xMW, 4.xMW and 5.xMW wind power generation sets gradually become mainstream types. The lower model of capacity such as 1.5MW, 2MW that some wind-powered electricity generation field originally adopted can't satisfy the power generation requirement because of the scheduling problem, need change the fan or change a higher tower section of thick bamboo in order to solve fan inefficiency problem, consequently can bring great load change, and original foundation structure can not satisfy the security, needs carry out more high-efficient reinforcement to original foundation structure and handles.
Disclosure of Invention
The invention aims to provide a land fan expanded foundation pipe pile reinforcing structure and a construction method, which are used for solving the technical problem that the original foundation structure cannot meet the upper structure when a fan or a higher tower cylinder needs to be replaced in land wind power generation equipment by reinforcing the original foundation structure.
In order to achieve the purpose, the invention adopts the technical scheme that:
a land fan extension foundation pipe pile reinforcing structure comprises a fan foundation original structure, wherein the fan foundation original structure comprises a concrete structure and an anchor bolt assembly arranged in the concrete structure;
the local pressure resistant grouting body is arranged below the top of the anchor bolt assembly;
drilling uniform holes on the outer side of the concrete structure, performing hole enlarging treatment on the bottom of each hole, arranging a prestressed pipe pile in each hole, and performing grouting treatment on holes between the prestressed pipe pile and the holes to form bonding grouting bodies;
the upper part of the bonding grouting body is exposed out of the concrete structure to form a concrete anchoring end;
the lower part of the bonding grouting body comprises the bottom of the hole to be expanded to form the concrete expanded head.
The invention further improves the following steps: the anchor bolt assembly is made of 42CrMo alloy steel in a model number of M36-M64, and the top of the anchor bolt assembly is subjected to Dacromet treatment.
The invention further improves the following steps: the concrete structure material is a concrete material containing reinforcing steel bars between the concrete strength C30-C60, the bottom of the concrete structure material is circular, and the diameter of the concrete structure material is 16-23 m.
The invention further improves the following steps: the local pressure resistant grouting body is of an annular structure, the upper surface of the local pressure resistant grouting body is flush with the surface of the concrete structure, the thickness of the local pressure resistant grouting body is 40-800 mm, and the compressive strength of the local pressure resistant grouting body is greater than or equal to 80 MPa.
The invention further improves the following steps: the holes avoid steel bars in the concrete structure when drilling, the diameter of the drilled holes is 200 mm-1000 mm, the depth of the drilled holes is greater than or equal to 1m, the number of the drilled holes is greater than one circle, and at least four holes are formed in each circle.
The invention further improves the following steps: the diameter range of the prestressed pipe pile is between 150mm and 800mm, the concrete strength is between C40 and C125, the length of the prestressed pipe pile anchored into the rock-soil mass at the lower part of the concrete structure is determined according to the geological performance of the rock-soil mass, and when the prestressed pipe pile is in rock geology, the anchoring length is more than or equal to 1m; when the geological condition is soft soil, the anchoring length is more than 3m.
The invention further improves the following steps: the bonding grouting body has the compressive strength of more than or equal to 60 MPa, the fluidity of more than 340mm and the vertical expansion rate of 0.1-3.5 h.
The invention further improves the following steps: mesh reinforcing steel bars are arranged at the upper part of the bonding grouting body, and a reinforcing cage is arranged in 2/5 of the length of the side surface of the upper part of the bonding grouting body to form a concrete anchoring end; the mesh reinforcing steel bar has 8-28 mm diameter and ribs and 215-355N/mm yield strength 2 When in arrangement, the prestressed pipe piles are rotationally arranged by taking the centers of the prestressed pipe piles as centers, the diameter of the reinforcement cage is 8-28 mm, the reinforcement cage is provided with ribs, and the yield strength is 215-355N/mm 2 And the prestressed pipe pile is arranged between the prestressed pipe pile and the hole.
The invention further improves the following steps: and the anchor bolt assembly is connected with the tower cylinder to be replaced through a flange.
A construction method of a land fan expanded foundation pipe pile reinforcing structure comprises the following steps:
the method comprises the following steps: on the basis of the original structure of the wind power foundation, chiseling partial concrete of a concrete structure below an anchor bolt assembly, and pouring grouting material with higher strength than chiseling concrete to form an annular local pressure resistant grouting body structure;
step two: uniformly drilling holes on the outer side of the concrete structure, and performing pore diameter enlarging treatment on the bottoms of the holes;
step three: selecting a prestressed pipe pile according to the diameter of the hole, inserting the prestressed pipe pile into the corresponding hole, and grouting the hole between the hole and the prestressed pipe pile to form a bonding grouting body; the upper part of the bonding grouting body is exposed out of the concrete structure to form a concrete anchoring end; the lower part of the bonding grouting body comprises the bottom of the hole to be expanded to form the concrete expanded head.
Compared with the prior art, the invention has the beneficial effects that:
the invention anchors the prestressed pipe pile into the rock-soil body by drilling, and forms a concrete anchoring end head and a concrete expanding head through grouting treatment, and the concrete anchoring end head and the concrete expanding head jointly resist the load transferred from the upper part by generating larger uplift force;
in the anchor bolt assembly, the anchor bolt material is 42CrMo alloy steel, and the model is M36-M64, so that the service life is prolonged;
according to the invention, the local pressure resistant grouting body is embedded into the concrete structure, the upper surface of the local pressure resistant grouting body is flush with the surface of concrete, and the concrete is used for resisting the vertical force transmitted from the bottom of the tower barrel, so that local damage is prevented;
when the prestressed pipe pile resists to pull out, the concrete anchor end provides bigger reverse acting force, and the concrete enlarged head provides bigger resistance to pull out.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention. In the drawings:
FIG. 1 is a cross-sectional view of a land fan expanded foundation pipe pile reinforcing structure of the invention;
FIG. 2 is a top view of a land wind turbine extended foundation pipe pile reinforcing structure of the present invention;
FIG. 3 is a cross-sectional view of a prestressed pipe pile and a bonding grouting body in the land fan expanded foundation pipe pile reinforcing structure;
fig. 4 is a top view of a prestressed pipe pile and a bonding grouting body in the land wind turbine extended foundation pipe pile reinforcing structure.
In the figure: 1. an anchor bolt assembly; 2. local pressure resistant grouting body; 3. a concrete structure; 4. a hole; 5. pre-stressing pipe piles; 6. bonding the grouting body; 6-1, a concrete anchoring end; 6-2, a concrete expansion head; 7. a reinforcement cage; 8. mesh sheet reinforcing steel bars.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further explanation of the invention as claimed. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Example 1
As shown in fig. 1 to 4, the present invention provides a land wind turbine extended foundation pipe pile reinforcing structure, an original wind turbine foundation structure includes an anchor bolt assembly 1 and a concrete structure 3, and the wind turbine needs to be replaced or a higher tower needs to be replaced due to the low efficiency of the wind turbine, so as to reinforce the original foundation structure. Need chisel out the concrete below the crab-bolt sub-assembly 1, pour into the grout material that excels in of higher grade, form the 2 structures of annular anti local pressure grout body for the vertical force of resisting tower section of thick bamboo bottom transmission prevents that the part from destroying, finally forms big board-like foundation structure.
The anchor bolt assembly 1 comprises a plurality of studs, the studs are arranged into two concentric circles by taking the center of the concrete structure 3 as a circle center, and all the studs on the two concentric circles are uniformly distributed. The base and the tower cylinder are in straight flexible connection, stress is reasonable, stress concentration is reduced, and reliability is improved. The anchor bolt material of the anchor bolt assembly 1 is 42CrMo alloy steel, the model is M36-M64, so that the service life is ensured to be not less than 20 years.
The end part of the anchor bolt assembly 1 needs to be subjected to special anti-corrosion treatment, the body is treated by Dacromet, and a protective cap is arranged and filled with the lithium-based grease lubricant with the number 2.
The concrete structure 3 is made of C30-C60 reinforced concrete, the bottom of the bearing platform is circular, the diameter of the bottom of the bearing platform is about 16-23 m, and the steel bars need to meet the requirements of relevant specifications.
The local pressure resistant grouting body 2 is of an annular structure, the thickness is about 40 mm-200 mm, the annular width is 200-800 mm, and the compressive strength is not less than 80 MPa. The anti-local-pressure grouting body 2 is embedded into the concrete structure 3, and the upper surface of the anti-local-pressure grouting body is flush with the surface of the concrete. Through the concrete to being used for resisting the vertical force of tower section of thick bamboo bottom transmission, prevent that the part from destroying.
The holes 4 are formed by uniformly drilling holes on the outer side of the concrete structure 3, steel bars in the concrete structure 3 are avoided during drilling, the diameter of the drilled holes is 200-1000 mm, the depth of the drilled holes drilled into the rock soil body is not less than 1m, and the hole diameter is expanded at the bottom. The number of the drilled holes is more than 1 circle, and at least 4 drilled holes are distributed. According to the actual situation, two circles are distributed more reasonably, and the total amount is 4-40 according to the size of the replaced machine type load.
The size of the prestressed pipe pile 5 is selected according to the hole 4, the diameter is between 150 and 800mm, and the strength is between C40 and C125. And (3) bonding grouting bodies 6 in the holes between the holes 4 and the prestressed tubular piles 5, integrating the upper parts of the prestressed tubular piles 5 and the concrete structure 3 through cohesive force, and combining the 5 parts of the prestressed tubular piles with rock-soil bodies. The length of the prestressed pipe pile 5 anchored into the rock-soil body is determined according to the geological properties of the rock-soil body. When the geological condition is rock geological condition, the anchoring length is not less than 3m, and the anchoring length is more than 1 m.
The cementing body 6 is made of cement-based grouting material and is formed by mixing raw materials such as cement, aggregate, an additive, a mineral admixture and the like. The compressive strength is not less than 60 MPa, the fluidity is more than 340mm, and the vertical expansion rate of 3h is between 0.1 and 3.5. When high temperature environment or winter construction exists, materials meeting corresponding conditions are selected.
The upper part of the bonding grouting body 6 is anchored by concreteThe end head 6-1, the lower part is a concrete expanding head 6-2. The concrete anchoring end 6-1 is formed by arranging mesh reinforcing steel bars 8 at the upper part of the bonding grouting body 6 and arranging reinforcing cages 7 in a certain length of the side surface. The main purpose is that the concrete anchoring head 6-1 provides a larger counter-acting force when the prestressed pipe pile 5 resists pulling. The mesh reinforcing steel bar 8 has ribs with the diameter of 8 mm-28 mm and the yield strength of 215-355N/mm 2 The arrangement mode is that the prestressed pipe piles 5 are arranged in a rotating mode by taking the centers of the prestressed pipe piles as centers. The diameter of the steel reinforcement cage 7 is 8 mm-28 mm, the steel reinforcement cage is provided with ribs, and the yield strength is 215-355N/mm 2 And is arranged between the prestressed pipe pile 5 and the hole 4.
The concrete expansion head 6-2 is formed by filling and bonding grouting body 6 at the bottom of the expansion hole 4 to provide larger pulling resistance for the concrete expansion head 6-2.
Example 2
The invention also provides a construction method of the land fan expanded foundation pipe pile reinforced structure, which comprises the following steps:
step 1: chiseling part of concrete below the anchor bolt assembly 1, and pouring high-strength grouting material with higher grade to form an annular local pressure resistant grouting body 2 structure for resisting the vertical force transmitted from the bottom of the tower barrel and preventing local damage; the local pressure resistant grouting body 2 is of an annular structure, the thickness is about 40 mm-200 mm, the annular width is 200-800 mm, and the compressive strength is not less than 80 MPa;
step 2: holes 4 formed by drilling holes are uniformly drilled on the outer side of the concrete structure 3, steel bars in the concrete structure 3 are avoided during drilling, the diameter of the drilled holes is 200-1000 mm, the depth of the drilled holes to be drilled into the rock soil body is not less than 1m, and the hole diameter is expanded at the bottom. The number of the drilled holes is more than 1 circle, and at least 4 drilled holes are distributed. According to the actual situation, two circles are more reasonably distributed, and the total quantity is 4-40 according to the size of the replaced machine type load;
and step 3: the prestressed pipe piles 5 with the diameters of 150-800 mm and the strength of C40-C125 are selected according to the holes 4. Bonding grouting bodies 6 in the holes between the holes 4 and the prestressed pipe piles 5, integrating the upper parts of the prestressed pipe piles 5 and the concrete structure 3 through cohesive force, and combining the parts of the prestressed pipe piles 5 with rock-soil bodies;
and 4, step 4: mesh reinforcements 8 are arranged at the upper part of the bonding grouting body 6, and a reinforcement cage 7 is arranged in a certain length of the side surface to jointly form a concrete anchoring end 6-1; the main purpose is that when the prestressed pipe pile 5 resists pulling, the concrete anchoring end 6-1 provides larger reverse acting force; the bottom of the enlarged hole 4 is filled with the adhesive grouting body 6 to form the concrete enlarged head 6-2 to provide larger pulling resistance.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (7)
1. A land fan extension foundation pipe pile reinforcing structure is characterized by comprising an original fan foundation structure, wherein the original fan foundation structure comprises a concrete structure (3) and an anchor bolt assembly (1) arranged in the concrete structure (3);
the local pressure resistant grouting body (2) is arranged below the top of the anchor bolt assembly (1);
uniform holes (4) are drilled in the outer side of the concrete structure (3), the bottoms of the holes (4) are subjected to hole expanding treatment, prestressed pipe piles (5) are arranged in the holes (4), and holes between the prestressed pipe piles (5) and the holes (4) are subjected to grouting treatment to form bonding grouting bodies (6);
the upper part of the bonding grouting body (6) is exposed out of the concrete structure (3) to form a concrete anchoring end (6-1);
the lower part of the bonding grouting body (6) comprises the bottom of the expanded hole (4) to form a concrete expanded head (6-2);
the holes (4) avoid steel bars in the concrete structure (3) during drilling, the diameter of the drilled holes is 200-1000 mm, the depth of the drilled holes is greater than or equal to 1m, the number of the drilled holes is greater than one circle, and each circle is provided with at least four holes;
the diameter range of the prestressed pipe pile (5) is between 150mm and 800mm, the concrete strength is between C40 and C125, the length of the prestressed pipe pile (5) anchored into a rock-soil body at the lower part of the concrete structure (3) is determined according to the geological performance of the rock-soil body, and when the prestressed pipe pile is in rock geology, the anchoring length is greater than or equal to 1m; when the geological condition is soft soil, the anchoring length is more than 3m;
mesh reinforcements (8) are arranged at the upper part of the bonding grouting body (6), and a reinforcement cage (7) is arranged in 2/5 of the length of the side surface of the upper part of the bonding grouting body (6) to form a concrete anchoring end (6-1); the mesh reinforcing steel bar (8) is ribbed with the diameter of 8-28 mm and the yield strength of 215-355N/mm 2 When the prestressed pipe pile is arranged, the prestressed pipe pile (5) is arranged in a rotating way by taking the center as the center, the diameter of the reinforcement cage (7) is 8-28 mm, the reinforcement cage is provided with ribs, and the yield strength is 215-355N/mm 2 And the prestressed pipe pile is arranged between the prestressed pipe pile (5) and the hole (4).
2. The land fan extension foundation pipe pile reinforcing structure of claim 1, wherein the anchor bolt material of the anchor bolt assembly (1) is 42CrMo alloy steel, the type is M36-M64, and the top of the anchor bolt assembly (1) is subjected to Dacromet treatment.
3. The land wind turbine extension foundation pipe pile reinforcement structure as claimed in claim 1, wherein the concrete structure (3) is made of concrete material containing steel bars between C30-C60 concrete strength, and the bottom of the concrete structure is circular and has a diameter of 16-23 m.
4. The land fan expanded foundation pipe pile reinforcing structure as claimed in claim 1, wherein the local pressure resistant grouting body (2) is of an annular structure, the upper surface of the local pressure resistant grouting body is flush with the surface of the concrete structure (3), the thickness of the local pressure resistant grouting body is 40 mm-800 mm, and the compressive strength of the local pressure resistant grouting body is greater than or equal to 80 MPa.
5. The land fan extension foundation pipe pile reinforcing structure of claim 1, wherein the bonding grouting body (6) has a compressive strength of 60 MPa or more and a fluidity of 340mm, and a vertical expansion rate of 3h of 0.1-3.5.
6. The land wind turbine extension foundation pipe pile reinforcement structure of claim 1, wherein the anchor bolt assembly (1) is connected with a tower barrel to be replaced through a flange.
7. The construction method of the land wind turbine extension foundation pipe pile reinforcement structure of any one of claims 1 to 6, comprising the steps of:
the method comprises the following steps: on the basis of the original structure of the wind power foundation, chiseling partial concrete of a concrete structure (3) below an anchor bolt assembly (1), and pouring grouting material with higher strength than chiseling concrete to form an annular partial pressure resistant grouting body (2) structure;
step two: uniformly drilling holes (4) on the outer side of the concrete structure (3), and performing pore diameter expansion treatment on the bottoms of the holes (4);
step three: selecting a prestressed pipe pile (5) according to the diameter of the hole (4), inserting the prestressed pipe pile (5) into the corresponding hole (4), and grouting the hole between the hole (4) and the prestressed pipe pile (5) to form a bonding grouting body (6); the upper part of the bonding grouting body (6) is exposed out of the concrete structure (3) to form a concrete anchoring end (6-1); the lower part of the bonding grouting body (6) comprises the bottom of the hole (4) to be expanded to form a concrete expansion head (6-2).
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| CN114687375B (en) * | 2022-04-10 | 2024-05-10 | 中广核新能源(宣城)有限公司 | Foundation structure of motor unit and construction method thereof |
| CN115573376B (en) * | 2022-08-12 | 2024-05-24 | 中国电力工程顾问集团西南电力设计院有限公司 | Method for treating cracking of foundation of circular transmission tower |
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| CN104420486B (en) * | 2013-08-21 | 2017-03-01 | 贵阳铝镁设计研究院有限公司 | A kind of extending shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile |
| US9783950B2 (en) * | 2014-10-07 | 2017-10-10 | Allan P. Henderson | Retrofit reinforcing structure addition and method for wind turbine concrete gravity spread foundations and the like |
| CN204780988U (en) * | 2015-07-01 | 2015-11-18 | 中国十七冶集团有限公司 | Anticorrosive aerogenerator foundation structure |
| CN105350565B (en) * | 2015-12-07 | 2017-04-05 | 湖南皓诺工程有限公司 | A kind of wind electric field blower tower foundation repairing and reinforcing method |
| CN206396816U (en) * | 2017-01-13 | 2017-08-11 | 中国电建集团中南勘测设计研究院有限公司 | A kind of blower foundation various dimensions ruggedized construction |
| CN107100192B (en) * | 2017-06-19 | 2022-06-07 | 湖南科技大学 | Local reinforcing device and method for foundation ring of wind generating set |
| CN107938696A (en) * | 2017-12-22 | 2018-04-20 | 中国地质大学（武汉） | A kind of prestressing force base expanding and base expanding anchor cable blower foundation for Rock Region |
| CN108411931A (en) * | 2018-04-02 | 2018-08-17 | 中国电建集团中南勘测设计研究院有限公司 | A kind of reinforcement means of blower foundation |
| CN111501814B (en) * | 2020-03-23 | 2021-03-16 | 河北工业大学 | Offshore wind turbine composite foundation and foundation reinforcement construction method |
| CN112064664A (en) * | 2020-09-17 | 2020-12-11 | 武大巨成结构股份有限公司 | Improved structure and improved method for fan foundation |
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