CN113550348A - Land large-plate foundation anchor rod reinforcing structure, construction method and fan foundation structure - Google Patents
Land large-plate foundation anchor rod reinforcing structure, construction method and fan foundation structure Download PDFInfo
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- CN113550348A CN113550348A CN202110997220.6A CN202110997220A CN113550348A CN 113550348 A CN113550348 A CN 113550348A CN 202110997220 A CN202110997220 A CN 202110997220A CN 113550348 A CN113550348 A CN 113550348A
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- bearing platform
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- prestressed anchor
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a land large-plate foundation anchor rod reinforcing structure, a construction method and a fan foundation structure, which comprise a concrete structure bearing platform, wherein a reinforced concrete layer is paved on the outer side surface of the concrete structure bearing platform, a plurality of holes are formed in the outer side surface of the concrete structure bearing platform, prestressed anchor rods are arranged in the holes, one ends of the prestressed anchor rods are inserted into the holes, the other ends of the prestressed anchor rods are arranged in the reinforced concrete layer, and grouting bodies for bonding the prestressed anchor rods with the concrete structure bearing platform and the reinforced concrete layer are injected into the holes between the holes and the prestressed anchor rods. The onshore large-plate foundation anchor rod reinforcing structure can generate larger uplift resistance, commonly resists the load transmitted from the upper part, increases the stability of the original structure of the wind turbine foundation, and can meet the foundation safety requirements of replacing different wind turbine generators or increasing the height of the tower.
Description
Technical Field
The invention relates to the technical field of wind generating set foundations, in particular to a reinforced structure of an anchor rod of a onshore large-plate type foundation, a construction method and a fan foundation structure.
Background
The Chinese energy development of the new era realizes carbon peak reaching and carbon neutralization, and is a hard layer. The fan also tends to be large-sized, and the long blades of the high tower gradually become a mainstream fan. The original low-capacity fans such as 0.75-2 megawatts used in some wind power plants cannot meet the power generation requirement due to the problems of site selection and the like, and the fans or higher towers need to be replaced in order to solve the problem of low efficiency of the fans, so that great load change can be brought. If original not consolidate foundation structure if direct change fan or change higher tower section of thick bamboo, whole wind turbine generator system has the risk of toppling, and original foundation structure can not satisfy the security requirement, needs carry out the reinforcement to original foundation structure more high-efficient and handles.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a land large-plate foundation anchor rod reinforcing structure, a construction method and a fan foundation structure, so that the stability of the original structure of the fan foundation is improved, and the foundation safety requirements of replacing different wind turbine generators or increasing the height of a tower can be met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a land large-slab foundation anchor rod reinforcing structure comprises a reinforced concrete layer and a prestressed anchor rod; the reinforced concrete layer is laid on the outer side surface of a concrete structure bearing platform of the fan foundation structure, one end of the prestressed anchor rod is inserted into a hole formed in the outer side surface of the concrete structure bearing platform, and the other end of the prestressed anchor rod is arranged in the reinforced concrete layer; and grouting body for bonding the prestressed anchor rod with the concrete structure bearing platform and the reinforced concrete layer is injected into the hole between the hole and the prestressed anchor rod.
Furthermore, the other end of the prestressed anchor rod penetrates through the reinforced concrete layer and is fixed at the anchoring end through a base plate and a nut, and the rod body of the prestressed anchor rod is of a threaded structure.
Furthermore, a sleeve is sleeved on the prestressed anchor rod of the reinforced concrete layer.
Furthermore, the edge of the reinforced concrete layer extends into the ground, and the tail end of the reinforced concrete layer extending into the ground extends towards the radial direction far away from the concrete structure bearing platform to form a reinforcing platform.
Furthermore, the thickness of the reinforced concrete layer is not less than 0.5m, the depth of the reinforced concrete layer extending into the ground is not less than 0.5m, and the width of the reinforcing platform is not less than 1 m.
Furthermore, the holes are uniformly distributed on the outer side surface of the concrete structure bearing platform in a plurality of concentric circle structures.
Furthermore, the diameter of the hole is 50 mm-300 mm, and the depth is not less than 0.5 m.
The invention provides a fan foundation structure applying a large land plate type foundation anchor rod reinforcing structure, which comprises a concrete structure bearing platform and an anchor bolt assembly, wherein the lower part of the anchor bolt assembly is embedded in the concrete structure bearing platform; and an annular groove is formed in the concrete structure bearing platform on the periphery of the lower part of the anchor bolt assembly, and grouting material is poured into the annular groove.
Furthermore, the thickness of the annular groove is 40 mm-200 mm, and the width of the ring is 200-800 mm.
As another object of the present invention, the present invention provides a construction method of a reinforced structure of an anchor rod of a large onshore plate type foundation, comprising the steps of:
step 1: drilling holes on the outer side surface of a concrete structure bearing platform;
step 2: inserting a prestressed anchor rod into the hole, exposing the upper part of the prestressed anchor rod out of the surface of the concrete structure bearing platform, pouring grouting body into a hole between the hole and the prestressed anchor rod, and bonding the prestressed anchor rod and the concrete structure bearing platform through cohesive force to form an integral structure;
and step 3: binding reinforcing steel bar meshes on the outer side surfaces of the concrete structure bearing platforms, avoiding the prestressed anchor rods when the reinforcing steel bar meshes are bound, extending the edges of the reinforcing steel bar meshes into the ground, and extending the tail ends of the reinforcing steel bar meshes extending into the ground to the radial direction far away from the concrete structure bearing platforms;
and 4, step 4: sleeving a sleeve on the prestressed anchor rod exposed out of the surface of the concrete structure bearing platform to form a free end; then, pouring reinforced concrete on the template, wherein the reinforced concrete is paved on the outer side surface of the concrete structure bearing platform and the ground extension section of the reinforced mesh, and the reinforced mesh and the reinforced concrete form a reinforced concrete layer through the adhesive force;
and 5: after the concrete is reinforced, a base plate is installed at one end, exposed out of the reinforced concrete layer, of the prestressed anchor rod, and then the nut is screwed.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of paving a reinforced concrete layer on a concrete structure bearing platform, inserting one end of a prestressed anchor rod into a hole formed in the outer side surface of the concrete structure bearing platform, and arranging the other end of the prestressed anchor rod in the reinforced concrete layer; and the hole between hole and prestressed anchorage pole pours into the project organization of grout body into, makes prestressed anchorage pole closely combine concrete structure cushion cap and reinforced concrete layer through the cohesive force, and this reinforced structure can produce great withdrawal resistance, resists the load that upper portion transmitted down jointly, has increased the stability of the original structure of fan foundation, can satisfy and change different wind turbine generator system or increase the high basic safety requirement of tower section of thick bamboo.
Furthermore, the prestressed anchor rod penetrates through a reinforced concrete layer and is fixed at the anchoring end through the backing plate and the nut, so that the prestressed anchor rod can be used for resisting local pressure generated in tensioning.
Furthermore, the sleeve is sleeved on the prestressed anchor rod on the reinforced concrete layer, so that the upper part of the prestressed anchor rod is provided with a free end, and later-stage tensioning is facilitated.
Further, the edge of the reinforced concrete layer extends into the ground by adopting, and the tail end of the reinforced concrete layer extending into the ground extends to the radial direction far away from the concrete structure bearing platform to form a design structure of the reinforcing platform, so that the contact area of the fan foundation structure and the foundation is increased, and the stability of the original structure of the fan foundation is further improved.
Furthermore, the holes are uniformly distributed on the outer side surface of the concrete structure bearing platform in a plurality of concentric circle structures, so that the pulling resistance of the reinforced structure is improved.
Furthermore, an annular groove is formed in the concrete structure bearing platform on the periphery of the anchor bolt assembly, and grouting materials are poured into the annular groove, so that the vertical force transmitted from the bottom of the tower can be resisted, and local damage is prevented.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a schematic view of the prestressed anchor according to the present invention;
in the figure: 1-anchor bolt assembly, 2-annular local pressure resistant grouting body structure, 3-concrete structure bearing platform, 4-hole, 5-prestressed anchor rod, 6-grouting body, 7-sleeve, 8-backing plate, 9-reinforced concrete and 10-reinforced reinforcing mesh.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a reinforced structure of an anchor rod of a large-land-slab foundation comprises a reinforced concrete layer and a prestressed anchor rod 5; the reinforced concrete layer is laid on the outer side surface of a concrete structure bearing platform 3 of the fan foundation structure, one end of the prestressed anchor rod 5 is inserted into a hole 4 formed in the outer side surface of the concrete structure bearing platform 3, and the other end of the prestressed anchor rod is arranged in the reinforced concrete layer; and a grouting body 6 which enables the prestressed anchor 5 to be bonded with the concrete structure bearing platform 3 and the reinforced concrete layer is injected into the hole between the hole 4 and the prestressed anchor 5, and the prestressed anchor 5 and the concrete structure bearing platform 3 are bonded to form an integral structure through cohesive force. This design makes prestressed anchorage pole 5 closely combine concrete structure cushion cap 3 and reinforced concrete layer, and this reinforced structure can produce great withdrawal resistance, resists the load that upper portion transmitted down jointly, has increased the stability of the original structure of fan basis, can satisfy and change different wind turbine generator system or increase the high basic safety requirement of a tower section of thick bamboo.
The grouting body 6, preferably a cement-based grouting material, is prepared by proportionally mixing raw materials such as cement, aggregate, an additive, a mineral admixture and the like in a professional engineering. The compressive strength is not less than 60 MPa, the fluidity is preferably more than 340mm, and the vertical expansion rate of 3 hours is between 0.1 and 3.5. When high temperature environment or winter construction exists, materials meeting corresponding conditions are selected.
The concrete structure bearing platform 3 is made of C30-C60 reinforced concrete containing materials, the diameter of the circle at the bottom is 16-23 m, and the steel bars need to meet the requirements of relevant specifications.
In one embodiment of the invention, the edge of the reinforced concrete layer extends into the ground, the tail end of the reinforced concrete layer extending into the ground extends to the radial direction far away from the concrete structure bearing platform 3 to form a reinforcing platform, the thickness of the reinforced concrete layer is not less than 0.5m, the depth extending into the ground is not less than 0.5m, and the width of the reinforcing platform is not less than 1 m.
In one embodiment of the invention, as shown in fig. 2, the holes 4 are uniformly distributed on the outer side of the concrete structure bearing platform 3 in a concentric circle structure, which improves the pulling resistance of the reinforcing structure. Preferably 3-5 concentric circles, at least 4 holes 4 are distributed in each concentric circle, the diameter of each hole 4 is 50-300 mm, and the depth is not less than 0.5 m; the total number of the holes 4 is 10-100, and calculation is carried out according to the load of the replaced fan.
As shown in fig. 3, in one embodiment of the present invention, the prestressed anchor 5 is inserted through the reinforced concrete layer at the other end and fixed at the anchoring end by a spacer 8 and a nut for resisting a local pressure generated when it is tensioned, and the tension stress is not less than 5 MPa. The rod body of prestressed anchor 5 is the helicitic texture, overlaps on the prestressed anchor 5 on reinforced concrete layer and establishes sleeve pipe 7, and the thickness of sleeve pipe 7 is not less than 2mm, adopts the PE material, and length is according to the thickness decision on reinforced concrete layer. The sleeve 7 enables the upper part of the prestressed anchor rod 5 to have a free end, and later-stage tensioning is facilitated.
A wind turbine foundation structure applying a large land plate type foundation anchor rod reinforcing structure is shown in figure 1 and comprises a concrete structure bearing platform 3 and an anchor bolt assembly 1, wherein the lower part of the anchor bolt assembly 1 is embedded in the concrete structure bearing platform 3; an annular groove is formed in the concrete structure bearing platform 3 on the periphery of the lower portion of the anchor bolt assembly 1, the thickness of the annular groove ranges from 40mm to 200mm, the annular width ranges from 200mm to 800mm, grouting materials are poured into the annular groove and are high-strength grouting materials with higher levels to form an annular local pressure resistant grouting body structure 2, the upper surface of the annular local pressure resistant grouting body 2 is flush with the surface of the concrete structure bearing platform 3, the compressive strength is not less than 80 MPa, and the anchor bolt assembly is used for resisting vertical force transmitted from the bottom of a tower and preventing local damage.
The anchor bolt assembly 1 comprises a plurality of studs which are uniformly distributed in two concentric circular structures, and has the effects of enabling the foundation and the tower to be in straight flexible connection, being reasonable in stress, reducing stress concentration and increasing reliability. The anchor bolt material of the anchor bolt assembly 1 is 42CrMo alloy steel, and the model is M36-M64, so that the service life of the anchor bolt assembly 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 preferably subjected to Dacromet treatment, and a protective cap is arranged, wherein the protective cap is filled with lithium-based grease lubricant with the mass 2 label.
In order to facilitate understanding of the invention, the invention discloses a construction method of a reinforced structure of an anchor rod of a land large-plate type foundation, which comprises the following steps:
step 1: drilling a hole 4 on the outer side surface of the concrete structure bearing platform 3, and avoiding the steel bars in the concrete structure bearing platform 3 during drilling;
step 2: inserting a prestressed anchor rod 5 into the hole 4, exposing the upper part of the prestressed anchor rod 5 out of the surface of the concrete structure bearing platform 3, pouring grouting body 6 into a pore between the hole 4 and the prestressed anchor rod 5, and bonding the prestressed anchor rod 5 and the concrete structure bearing platform 3 by cohesive force to form an integral structure;
and step 3: binding a reinforcing steel bar mesh 10 on the outer side surface of the concrete structure bearing platform 3, wherein the reinforcing steel bar mesh is made of HRB400 steel and has the diameter of 8-28 mm; when the reinforcing steel bar mesh 10 is bound, the prestressed anchor rods 5 are avoided, the edge of the reinforcing steel bar mesh 10 extends into the ground, and the tail end of the reinforcing steel bar mesh 10 extending into the ground extends to the radial direction far away from the concrete structure bearing platform 3;
and 4, step 4: sleeving a sleeve 7 on the prestressed anchor rod 5 exposed out of the surface of the concrete structure bearing platform 3 to form a free end; then, casting reinforced concrete 9 on the template, wherein the reinforced concrete 9 is to be paved on the outer side surface of the concrete structure bearing platform 3 and the ground extension section of the reinforced mesh reinforcement 10, and the reinforced mesh reinforcement 10 and the reinforced concrete 9 form a reinforced concrete layer through adhesive force;
and 5: after the concrete 9 is reinforced, a backing plate 8 is installed at one end of the prestressed anchor rod 5 exposed out of the reinforced concrete layer, then the nut is screwed, and the structure can be subjected to post-tensioning by using tensioning equipment.
The exemplary embodiments, however, can be embodied in many forms and should not be construed as limited to the embodiments set forth herein, and one of ordinary skill in the art can, in light of the present disclosure, make many changes to the embodiments without departing from the spirit of the disclosure or the scope of the appended claims.
Claims (10)
1. The utility model provides a big board-like basis stock reinforced structure of land which characterized in that: comprises a reinforced concrete layer and a prestressed anchor rod (5); the reinforced concrete layer is laid on the outer side surface of a concrete structure bearing platform (3) of the fan foundation structure, one end of the prestressed anchor rod (5) is inserted into a hole (4) formed in the outer side surface of the concrete structure bearing platform (3), and the other end of the prestressed anchor rod is arranged in the reinforced concrete layer; and a grouting body (6) which is used for bonding the prestressed anchor rod (5), the concrete structure bearing platform (3) and the reinforced concrete layer is injected into the gap between the hole (4) and the prestressed anchor rod (5).
2. The anchor-rod reinforced structure of the large onshore plate type foundation according to claim 1, wherein the other end of the prestressed anchor rod (5) passes through the reinforced concrete layer and is fixed at the anchoring end by a washer (8) and a nut, and the rod body of the prestressed anchor rod (5) has a threaded structure.
3. The anchor-rod reinforcing structure of a large onshore plate type foundation according to claim 2, wherein a sleeve (7) is sleeved on the prestressed anchor rods (5) of the reinforced concrete layer.
4. The anchor-rod reinforced structure of a large onshore plate type foundation according to claim 1, wherein the edge of the reinforced concrete layer extends into the ground, and the end of the reinforced concrete layer extending into the ground extends in a radial direction away from the concrete structure bearing platform (3) to form a reinforcing platform.
5. The reinforcement structure of anchor rods for onshore large plate foundations according to claim 4, wherein the thickness of the reinforced concrete layer is not less than 0.5m, the depth of the reinforced concrete layer extending into the ground is not less than 0.5m, and the width of the reinforcing platform is not less than 1 m.
6. The reinforcement structure of anchor rods for large onshore plate type foundations according to claim 1, characterized in that the holes (4) are uniformly distributed on the outer side of the concrete structural bearing platform (3) in a plurality of concentric circles.
7. The reinforcement structure of anchor rods for large onshore plate foundation according to claim 1, wherein the diameter of the hole (4) is 50mm to 300mm and the depth is not less than 0.5 m.
8. A fan foundation structure applying the anchor rod reinforcing structure of the overland slab type foundation according to any one of claims 1 to 7, characterized by comprising a concrete structure bearing platform (3) and an anchor bolt assembly (1), wherein the lower part of the anchor bolt assembly (1) is embedded in the concrete structure bearing platform (3); and an annular groove is formed in the concrete structure bearing platform (3) on the periphery of the lower part of the anchor bolt assembly (1), and grouting material is poured into the annular groove.
9. The fan foundation structure of claim 8, wherein the annular groove has a thickness of 40mm to 200mm and an annular width of 200mm to 800 mm.
10. The construction method of the anchor rod reinforcing structure of the large onshore plate type foundation according to any one of claims 1 to 7, which comprises the following steps:
step 1: drilling a hole (4) on the outer side surface of the concrete structure bearing platform (3);
step 2: inserting a prestressed anchor rod (5) into the hole (4), exposing the upper part of the prestressed anchor rod (5) out of the surface of the concrete structure bearing platform (3), pouring grouting body (6) into a hole between the hole (4) and the prestressed anchor rod (5), and bonding the prestressed anchor rod (5) and the concrete structure bearing platform (3) through cohesive force to form an integral structure;
and step 3: binding reinforcing steel bar nets (10) on the outer side surfaces of the concrete structure bearing platforms (3), avoiding the prestressed anchor rods (5) when the reinforcing steel bar nets (10) are bound, extending the edges of the reinforcing steel bar nets (10) into the ground, and extending the tail ends of the reinforcing steel bar nets (10) extending into the ground to the radial direction far away from the concrete structure bearing platforms (3);
and 4, step 4: sleeving a sleeve (7) on the prestressed anchor rod (5) exposed out of the surface of the concrete structure bearing platform (3) to form a free end; then, pouring reinforced concrete (9) into the template, wherein the outer side surface of the concrete structure bearing platform (3) and the ground extension section of the reinforced mesh (10) are paved with the reinforced concrete (9), and the reinforced mesh (10) and the reinforced concrete (9) form a reinforced concrete layer through adhesion;
and 5: after the concrete (9) is reinforced, a backing plate (8) is installed at one end of the prestressed anchor rod (5) exposed out of the reinforced concrete layer, and then the nut is screwed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110997220.6A CN113550348A (en) | 2021-08-27 | 2021-08-27 | Land large-plate foundation anchor rod reinforcing structure, construction method and fan foundation structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110997220.6A CN113550348A (en) | 2021-08-27 | 2021-08-27 | Land large-plate foundation anchor rod reinforcing structure, construction method and fan foundation structure |
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| CN113550348A true CN113550348A (en) | 2021-10-26 |
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| CN202110997220.6A Pending CN113550348A (en) | 2021-08-27 | 2021-08-27 | Land large-plate foundation anchor rod reinforcing structure, construction method and fan foundation structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114000536A (en) * | 2021-11-30 | 2022-02-01 | 中国华能集团清洁能源技术研究院有限公司 | Large-pressure and small-pressure fan foundation structure and construction method |
| CN114753403A (en) * | 2022-05-12 | 2022-07-15 | 四川瑞科同创电力工程设计有限公司 | Foundation structure of wind turbine generator set with large generation and small generation and construction method |
| CN115125987A (en) * | 2022-07-11 | 2022-09-30 | 天津大学 | Land wind power foundation structure with capacity expansion capability and capacity expansion construction method thereof |
-
2021
- 2021-08-27 CN CN202110997220.6A patent/CN113550348A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114000536A (en) * | 2021-11-30 | 2022-02-01 | 中国华能集团清洁能源技术研究院有限公司 | Large-pressure and small-pressure fan foundation structure and construction method |
| CN114753403A (en) * | 2022-05-12 | 2022-07-15 | 四川瑞科同创电力工程设计有限公司 | Foundation structure of wind turbine generator set with large generation and small generation and construction method |
| CN115125987A (en) * | 2022-07-11 | 2022-09-30 | 天津大学 | Land wind power foundation structure with capacity expansion capability and capacity expansion construction method thereof |
| CN115125987B (en) * | 2022-07-11 | 2024-06-11 | 天津大学 | Land wind power foundation structure with capacity expansion capability and capacity expansion construction method thereof |
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Inventor after: Gao Jianhui Inventor after: Tan Guangdao Inventor after: Xu Chao Inventor after: Meng Xiujun Inventor after: Wang Dejun Inventor after: Xu Hongfei Inventor after: Zhu Yurui Inventor before: Gao Jianhui Inventor before: Tan Daoguang Inventor before: Xu Chao Inventor before: Meng Xiujun Inventor before: Wang Dejun Inventor before: Xu Hongfei Inventor before: Zhu Yurui |