CN113338365A - 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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- CN113338365A CN113338365A CN202110714910.6A CN202110714910A CN113338365A CN 113338365 A CN113338365 A CN 113338365A CN 202110714910 A CN202110714910 A CN 202110714910A CN 113338365 A CN113338365 A CN 113338365A
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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 by drilling, and forms the concrete anchoring end head and the concrete expanding head by 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.
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, and the wind power generation sets of 3.xMW, 4.xMW and 5.xMW gradually become mainstream types. The original 1.5MW, the lower model of capacity such as 2MW of the former adoption of some wind-powered electricity generation field can't satisfy the power generation requirement because of the scheduling problem of addressing, need change the fan or change higher tower section of thick bamboo in order to solve fan inefficiency problem, consequently can bring great load change, and original foundation structure can't 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, and aims to solve the technical problem that an original foundation structure cannot meet the upper structure when a fan or a higher tower drum 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 expanded hole to form a 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 with concrete strength between C30 and C60 and containing steel bars, 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 150-800 mm, the concrete strength is C40-C125, the length of the prestressed pipe pile anchored into the rock-soil body at the lower part of the concrete structure is determined according to the geological performance of the rock-soil body, and when the rock geology is adopted, the anchoring length is more than or equal to 1 m; when the geological condition is soft soil, the anchoring length is more than 3 m.
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 within 3 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 the length of 2/5 sides at the upper part of the bonding grouting body to form a concrete anchoring end; the mesh reinforcing steel bar is ribbed with the diameter of 8-28 mm and the yield strength of 215-355N/mm2When the steel bar cage is arranged, the steel bar cage is rotationally arranged by taking the center of the prestressed pipe pile as the center, the diameter of the steel bar cage is 8-28 mm, the steel bar cage is provided with ribs, and the yield strength is 215-355N/mm2And the prestressed pipe piles are arranged between the prestressed pipe piles and the holes.
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 expanded hole to form a 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, the model is M36-M64, and 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 the concrete, and the concrete is used for resisting the vertical force transmitted from the bottom of the tower barrel, so that the 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 incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain 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 expanding head; 7. a reinforcement cage; 8. mesh 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 details of the invention. 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 annular anti local pressure grout body 2 structure 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 foundation 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 guaranteed 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. The concrete prevents local damage to the vertical force used for resisting the transmission of the bottom of the tower.
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 actual conditions, two circles are distributed more reasonably, and the total amount of 4-40 circles is calculated according to the size of the replaced machine type load.
The size of the prestressed tubular 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 structure is rock geological, the anchoring length is more than 1m, and when the geological structure is soft soil geological, the anchoring length is not less than 3 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 greater 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 a concrete anchoring end 6-1, and 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 is ribbed with the diameter of 8-28 mm and the yield strength of 215-355N/mm2The arrangement mode is that the prestressed pipe piles 5 are arranged in a rotating mode by taking the center as the center. 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/mm2And 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 number of the circles is 4-40, and the circles are calculated according to the size of the replaced machine type load;
and step 3: the prestressed pipe piles 5 with the sizes selected according to the holes 4 are 150-800 mm in diameter and C40-C125 in strength. Bonding grouting bodies 6 in the holes between the holes 4 and the prestressed tubular piles 5, forming the upper parts of the prestressed tubular piles 5 and the concrete structure 3 into a whole through cohesive force, and combining the 5 parts of the prestressed tubular piles 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 (10)
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).
2. The land fan extension foundation pipe pile reinforcement structure of claim 1, wherein the anchor bolt material of the anchor bolt assembly (1) is 42CrMo alloy steel, the model 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 reinforcing structure as claimed in claim 1, wherein the concrete structure (3) is made of concrete material containing steel bars between the concrete strength C30-C60, the bottom of the concrete material is circular, and the diameter of the concrete material is 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 wind turbine extension foundation pipe pile reinforcement structure of claim 1, wherein the holes (4) avoid steel bars in the concrete structure (3) 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 each circle has at least four holes.
6. The onshore wind turbine extension foundation pipe pile reinforcement structure as claimed in claim 5, wherein the diameter of the prestressed pipe pile (5) is in the range of 150 mm-800 mm, the concrete strength is in the range of C40-C125, the length of the prestressed pipe pile (5) anchored into the rock-soil mass under the concrete structure (3) is determined according to the geological properties of the rock-soil mass, and in the case of rock geology, the anchoring length is greater than or equal to 1 m; when the geological condition is soft soil, the anchoring length is more than 3 m.
7. The land fan expanded foundation pipe pile reinforcing structure as claimed in claim 1, wherein the bonding grouting body (6) has a compressive strength of greater than or equal to 60 MPa, a fluidity of greater than 340mm, and a 3h vertical expansion rate of 0.1-3.5.
8. The land fan expanded foundation pipe pile reinforcing structure as claimed in claim 1, wherein the bonding grout body (6) is provided with mesh reinforcement bars (8) at the upper part, and a reinforcement cage (7) is arranged in the length of the side surface 2/5 at the upper part of the bonding grout 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/mm2When the prestressed pipe pile is arranged, the prestressed pipe pile (5) is arranged in a rotating mode by taking the center as the center, the diameter of the steel reinforcement cage (7) is 8-28 mm, the steel reinforcement cage is provided with ribs, and the yield strength is 215-355N/mm2And the prestressed pipe pile is arranged between the prestressed pipe pile (5) and the hole (4).
9. 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.
10. A construction method of a land fan expanded foundation pipe pile reinforcing structure is characterized by comprising 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 (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 expanded hole (4) to form a concrete expanded head (6-2).
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| CN114687375A (en) * | 2022-04-10 | 2022-07-01 | 中广核新能源六安有限公司 | Foundation structure of motor set and construction method thereof |
| CN115573376A (en) * | 2022-08-12 | 2023-01-06 | 中国电力工程顾问集团西南电力设计院有限公司 | Treatment method and reinforcement device for circular transmission tower foundation cracking |
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| CN115573376A (en) * | 2022-08-12 | 2023-01-06 | 中国电力工程顾问集团西南电力设计院有限公司 | Treatment method and reinforcement device for circular transmission tower foundation cracking |
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