CN114775676A - Reconstruction method and application suitable for built old wind power plant fan foundation - Google Patents
Reconstruction method and application suitable for built old wind power plant fan foundation Download PDFInfo
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- CN114775676A CN114775676A CN202210352531.1A CN202210352531A CN114775676A CN 114775676 A CN114775676 A CN 114775676A CN 202210352531 A CN202210352531 A CN 202210352531A CN 114775676 A CN114775676 A CN 114775676A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/48—Foundations inserted underneath existing buildings or constructions
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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
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0229—Increasing or restoring the load-bearing capacity of building construction elements of foundations or foundation walls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/22—Foundations specially adapted for wind motors
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Abstract
The invention provides a reconstruction method and application suitable for a built old wind power plant fan foundation, wherein the reconstruction method comprises the following steps: utilize original structure installation inside and outside two rings of crab-bolts on old wind-powered electricity generation field fan basis, pier top and outside concreting form expand middle pier in the basis after the installation is accomplished, bury inside and outside two rings of crab-bolts, the pretightning force after the crab-bolt stretch-draw fully guarantees the wholeness and the security of the fan basis after reforming transform. The modified wind turbine tower frame can be a concrete tower frame or a steel tower frame, and can be connected with the modified wind turbine foundation in an anchoring mode through steel stranded wires or anchor bolt cages, so that the technical modification of the wind turbine foundation is realized. The method fully utilizes the fan foundation structure, does not need to dismantle the original foundation and new land, saves the technical transformation cost, saves land resources, avoids land acquisition disputes, has simple working procedures and strong operability, and has reasonable stress form of the transformed fan foundation, good economy and safety.
Description
Technical Field
The invention relates to the technical field of onshore wind power generation, in particular to a method for modifying a fan foundation of an established old wind power plant and application thereof.
Background
With the rapid development of the wind power industry in China, the number of accumulated grid-connected wind power units exceeds 14 thousands at present, the service time of the wind power units connected with the grid in early stage exceeds or approaches to the design service life of 20 years, the single-machine capacity of the wind power units is smaller due to the earlier development time, most of the wind power units are located in areas with better wind resources, the generating capacity of the wind power units is deteriorated, the fault rate is high, the potential safety hazards are high along with the extension of the running time, the advantages of the high-quality wind resources cannot be exerted, and the running maintenance cost and the safety risk are increased. With the wind power market entering the flat era, the single machine capacity of wind turbine units in China has advanced into the megawatt era at present, and a large number of small-capacity units cause waste of land resources to a certain extent, so that the technical transformation of old wind power plants by replacing large-capacity units is imperative.
The old wind power plants in China are numerous and lack in land resources, and in order to effectively reduce the technical transformation cost of the old wind power plants and save the land resources, the transformation work of the old wind power plants should be completed on the basis of the original fan positions and fans as far as possible, so that the new land is reduced or avoided, and the dismantling work is reduced; the single machine capacity of the wind turbine generator system connected to the grid in the early stage is small, the tower frame generally adopts a steel tower, the steel tower is generally connected with the foundation by a foundation ring, after the large-capacity wind turbine generator system is replaced, the diameter of the bottom of the tower frame needs to be increased no matter the steel tower or the concrete tower frame is adopted, the interface of the tower frame and the foundation is changed, and the original foundation ring cannot directly meet the requirement of connection of the tower frame and the foundation.
Based on the above situation, how to directly perform technical transformation on the basis of the original wind turbine and how to realize the connection between the large-capacity unit tower and the foundation become challenges and difficulties for technical transformation of old wind power plants.
Disclosure of Invention
Aiming at the challenges and problems existing in the technical transformation of the old wind power plant, the invention provides the transformation method suitable for the wind turbine foundation of the built old wind power plant, which can directly realize the connection between a high-capacity unit tower and the foundation through the transformation on the basis of the original wind turbine foundation, avoid the dismantling of the original wind turbine foundation, the site selection of a new wind turbine site and a new land program, and effectively reduce the transformation cost of the old wind power plant.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a method for improving a wind turbine foundation of an old built wind power plant comprises the following steps: installing an inner circle of anchor bolts and an outer circle of anchor bolts on the original structure of the fan foundation of the built old wind power plant, newly pouring concrete on the top and the outer part of the middle pier of the foundation after the installation to form an enlarged circular middle pier, and embedding the inner circle of anchor bolts and the outer circle of anchor bolts; the existing structure of the existing wind power plant wind turbine foundation, the inner ring of anchor bolts, the outer ring of anchor bolts and the newly poured concrete form the modified wind turbine foundation.
While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:
as a preferred technical scheme of the invention: the bottom end of the inner ring anchor bolt is anchored on a fan foundation ring top flange after being sleeved with the embedded sleeve, the top end of the inner ring anchor bolt is anchored on the top surface of the enlarged circular middle pier through the upper anchor plate, and the number of the anchor bolts is the same as the number of original holes on the fan foundation ring top flange; the embedded sleeve ensures that the inner ring anchor bolt is separated from the newly poured concrete, and the upper anchor plate can be a whole ring steel plate or a discrete steel plate.
As a preferred technical scheme of the invention: uniformly forming a plurality of slotted holes in the root part of a middle pier of the fan foundation along the circumferential direction, and vertically punching the top surface of the middle pier to the slotted holes at the positions corresponding to the slotted holes downwards to form a pore channel; the outer ring anchor bolt is sleeved with an embedded sleeve and then respectively penetrates into the pore channels, the bottom end of the outer ring anchor bolt is anchored on the top surface of the groove hole through a lower anchor plate, and the top end of the outer ring anchor bolt is anchored on the top surface of the enlarged circular middle pier through an upper anchor plate; the pre-buried sleeve ensures that the outer ring anchor bolt is separated from the newly poured concrete.
As a preferred technical scheme of the invention: high-strength grouting is carried out at the slotted hole chiseled so as to ensure compactness.
As a preferred technical scheme of the invention: when enlarging circular middle pier and pouring, pour and make fan foundation ring form annular cavity around the flange in order to avoid newly concreting and top flange contact to the tension force of inner circle crab-bolt can transmit inside original fan foundation through the foundation ring.
As a preferred technical scheme of the invention: the foundation of the built old wind power plant fan is circular or polygonal.
The invention further aims to provide the application of the method for modifying the wind turbine foundation of the built old wind farm in the modification of the wind turbine foundation, which is suitable for overcoming the defects and shortcomings of the prior modification technology.
Therefore, the above purpose of the invention is realized by the following technical scheme:
the wind turbine foundation which is modified according to the modification method suitable for the built old wind power plant wind turbine foundation is applied as a concrete tower foundation or a steel tower foundation.
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
as a preferred technical scheme of the invention: when the pylon on basic upper portion is the concrete pylon after reforming transform, enlarge circular middle pier edge lower part and evenly form a plurality of cavitys along the hoop, no cavity department forms the gear form and strengthens the mound, the cavity space satisfies the normal construction of stretch-draw equipment, pre-buried steel pipe in the concrete of every cavity upper portion, the steel strand wires of concrete pylon pass pre-buried steel pipe to cavity, stretch-draw back bottom anchor in the cavity top surface in the cavity, the top anchor in the concrete pylon, realize the concrete pylon with reform transform the connection of back fan basis.
As a preferred technical scheme of the invention: when the tower on the upper portion of the transformed foundation is a steel tower, a conventional anchor bolt cage is installed on the upper portion of the original structure of the fan foundation before new pouring concrete is expanded to be buried in the new pouring concrete, the embedded sleeves of all anchor bolts of the anchor bolt cage guarantee that the anchor bolt cage anchor bolts are separated from the new pouring concrete, the upper end of each anchor bolt cage anchor bolt is anchored to a steel tower cylinder bottom flange after being tensioned, and the lower end of each anchor bolt cage anchor plate is anchored to an anchor bolt cage lower anchor plate, so that the steel tower is connected with the transformed fan foundation.
As a preferred technical scheme of the invention: after concrete pouring and maintenance are finished, the inner circle of anchor bolts and the outer circle of anchor bolts are used for expanding the top surface of the circular middle pier to perform tensioning anchoring, and the tensioning force of the anchor bolts is transmitted to the interior of the original structure of the fan foundation, so that the new concrete and the old concrete are tightly combined, and the integrity and the safety of the modified fan foundation are ensured.
The invention provides a method for modifying a fan foundation of an old built wind power plant and application thereof, and the method has the following beneficial effects:
(1) the method for modifying the wind turbine foundation of the old wind power plant is high in applicability, the conventional wind turbine foundation of the old wind power plant can be technically modified by the method, and the modified wind turbine foundation is suitable for both a concrete tower and a steel tower.
(2) The method for reconstructing the fan foundation of the built old wind power plant makes full use of the original structure, does not need to disassemble the original foundation, avoids new machine selection sites and new land features, saves land resources, reduces the coordination difficulty of the technical reconstruction implementation stage of the wind power project, and is favorable for avoiding land dispute.
(3) The method for transforming the fan foundation of the built old wind power plant is simple in process and convenient to implement, all the processes can be implemented by adopting a conventional construction method, the technical transformation construction efficiency of the fan foundation is effectively improved, the construction progress is accelerated, and the construction period is shortened.
(4) The method for improving the fan foundation of the built old wind power plant avoids pouring the foundation again, reduces the technical improvement overall cost of the old wind power plant, improves the generated energy of the wind power plant by replacing the large-capacity wind turbine generator after technical improvement, and obviously improves the economic benefit of the wind power plant.
(5) The wind turbine foundation transformed by the method for transforming the wind turbine foundation of the built old wind power plant fully utilizes the wind turbine foundation structure and the tension of the anchor bolts in the inner circle and the outer circle, realizes the tight combination of the new concrete and the old concrete, ensures the cooperative work of the new concrete and the old concrete, and has high safety.
(6) The distance between the inner ring anchor bolt and the outer ring anchor bolt and the steel strand or anchor bolt of the reconstructed fan tower frame is close, after the steel strand or anchor bolt is tensioned and anchored, the upward tension of the tower frame on the fan base and the downward counter force of the inner ring anchor bolt and the outer ring anchor bolt on the base are partially offset in the concrete at the upper part of the cavity, the structural stress form is reasonable, the concrete stress at the upper part of the cavity is reduced, the concrete height is reduced, and the foundation engineering quantity is reduced.
Drawings
FIG. 1 is a schematic diagram of a built old wind farm wind turbine foundation.
FIG. 2 is a structural illustration of a wind turbine foundation adapted for a concrete tower after a built old wind farm wind turbine foundation is modified.
FIG. 3 is a structural diagram of a wind turbine foundation suitable for a steel tower after a built old wind power plant wind turbine foundation is modified.
FIG. 4 is a sectional view taken along the direction A-A in FIG. 2, which is also a sectional view taken at the cavity of the modified blower base.
FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 2, which is a plan view of an enlarged circular center pier of the modified wind turbine foundation.
FIG. 6 is a cross-sectional view taken along the direction C-C in FIG. 3, and is a plan view of an enlarged circular center pier of the modified wind turbine foundation.
FIG. 7 is a cross-sectional view taken along direction D-D of FIG. 2 or 3, and is also a cross-sectional view of the anchor plate under the outer ring anchor of the modified wind turbine foundation.
FIG. 8 is a detailed view of an outer ring anchor bolt of the modified fan foundation.
FIG. 9 is a detailed view of an inner ring anchor bolt of the modified wind turbine foundation.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Without loss of generality, the basis of the old wind farm wind turbine in the embodiment is circular.
As shown in fig. 2 and 3, firstly, a certain number of inner ring anchor bolts 2 and outer ring anchor bolts 3 are installed on an original fan foundation 1, after the installation is completed, concrete 4 is newly poured outside and on the top of a middle pier of the original fan foundation 1, the inner ring anchor bolts 2 and the outer ring anchor bolts 3 are embedded, and the newly poured concrete 4, the inner ring anchor bolts 2, the outer ring anchor bolts 3 and the original fan foundation 1 are combined to form a modified fan foundation, wherein fig. 2 is suitable for a concrete tower, and fig. 3 is suitable for a steel tower.
The foundation ring 5 is embedded in the original fan foundation 1, the top flange of the foundation ring 5 is connected with the bottom flange of the original steel tower barrel through bolts, all connecting bolts are disassembled before the transformation begins, and the original steel tower barrel is removed.
The bottom end of the inner ring anchor bolt 2 is sleeved with the embedded sleeve and then penetrates through a top flange bolt hole of the foundation ring 5 to be anchored on the top flange, the top end of the inner ring anchor bolt 2 is provided with an upper anchor plate 6 (corresponding to the inner ring anchor bolt), the bottom surface of the upper anchor plate 6 is provided with a nylon nut for temporarily supporting the upper anchor plate 6, and each bolt hole is provided with one inner ring anchor bolt 2.
A plurality of slotted holes 7 are chiseled out along the hoop at the middle pier root of former fan foundation 1, correspond slotted hole 7 department from the middle pier top surface of former fan foundation 1 and make the pore path downwards vertically, 3 overcoat pre-buried sleeves of outer lane crab-bolt back bottom top-down pass pore path to slotted hole, support in the bottom surface of slotted hole 7 temporarily after the anchor plate 8 down of installation, anchor plate 9 (corresponding to the outer lane crab-bolt) is installed on the top, nylon nut is equipped with to the 9 bottom surfaces of anchor plate, be used for the temporary support of upper anchor plate 9, an outer lane crab-bolt 3 is installed to every slotted hole 7, carry out the high-strength grout to slotted hole 7 after the installation is accomplished, guarantee that slotted hole 7 is closely knit.
After the fan foundation is modified, when the upper tower frame is a concrete tower frame, newly pouring concrete 4 outside and on the top of a middle pier of an original fan foundation 1 after the inner ring anchor bolt 2 and the outer ring anchor bolt 3 are installed to form an enlarged circular middle pier, and forming an annular cavity 12 around a top flange of a foundation ring 5 inside the enlarged circular middle pier during pouring so that the newly poured concrete 4 is not in contact with the top flange; meanwhile, a plurality of cavities 10 are reserved on the lower portion of the outer edge of the enlarged circular middle pier uniformly in the circumferential direction, a plurality of steel pipes 11 are embedded above each cavity, the upper opening of each steel pipe 11 is flush with the top surface of the middle pier, and the lower opening of each steel pipe is flush with the top surface of the corresponding cavity 10. After concrete 4 is poured and cured, all the inner ring anchor bolts 2 and the outer ring anchor bolts 3 are tensioned on the top surface, the top ends of the inner ring anchor bolts 2 and the outer ring anchor bolts 3 are anchored on the top surface of the concrete 4, after the concrete tower is in place, the steel strands penetrate through the embedded steel pipes 11, tensioning equipment is placed in the cavity 10 to stretch the steel strands, the bottom ends of the steel strands are anchored on the top surface of the cavity 10 after tensioning, the top ends of the steel strands are anchored on the tower frame, and the anchor head mounting protective cover is isolated from the outside, so that connection between the concrete tower and the foundation is completed.
After the fan foundation is transformed, when the upper tower is a steel tower, the conventional anchor bolt cage is installed at the top of the middle pier of the original fan foundation 1 after the installation of the inner ring anchor bolt 2 and the outer ring anchor bolt 3 is completed, the enlarged circular middle pier is formed outside the middle pier of the fan foundation 1 and by newly pouring concrete 4 at the top after the installation is completed, the anchor bolt cage is embedded in the newly poured concrete 4, the anchor plate on the anchor bolt cage is positioned above the enlarged circular middle pier top surface, and all anchor bolts are guaranteed to be separated from the newly poured concrete through the outer sleeve embedded sleeves. After the newly-poured concrete 4 is poured and maintained, all inner ring anchor bolts 2 and outer ring anchor bolts 3 are tensioned on the top surface, then high-strength grouting is carried out on gaps between the anchor plates on the anchor bolt cage and the enlarged circular middle pier top surface, the steel tower cylinder bottom flange is in place to the top surface of the anchor plates after the grouting reaches a certain strength, all anchor bolts of the anchor bolt cage are tensioned on the top surface and anchored to the steel tower cylinder bottom flange, and all anchor bolts are provided with protective caps to be isolated from the outside, so that the connection between the steel tower and the foundation is completed.
According to the description and the drawings of the invention, a person skilled in the art can easily use the method for modifying the wind turbine foundation of an old wind farm and the application thereof, and can generate the positive effects recorded by the invention.
Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplicity of description, but it is not indicated or implied that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and are not to be construed as a limitation of the present patent, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances with reference to the drawings.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A modification method suitable for a built old wind power plant fan foundation is characterized by comprising the following steps: the method for modifying the wind turbine foundation of the built old wind power plant comprises the following steps: installing an inner circle of anchor bolts and an outer circle of anchor bolts on the original structure of the fan foundation of the built old wind power plant, newly pouring concrete on the top and the outer part of the middle pier of the foundation after the installation to form an enlarged circular middle pier, and embedding the inner circle of anchor bolts and the outer circle of anchor bolts; the existing structure of the existing wind power plant wind turbine foundation, the inner ring of anchor bolts, the outer ring of anchor bolts and the newly poured concrete form the modified wind turbine foundation.
2. The reconstruction method suitable for the wind turbine foundation of the built old wind farm according to the claim 1, characterized in that: the bottom end of the inner ring anchor bolt is anchored on a fan foundation ring top flange after being sleeved with the embedded sleeve, the top end of the inner ring anchor bolt is anchored on the top surface of the enlarged circular middle pier through the upper anchor plate, and the number of the anchor bolts is the same as the number of original holes on the fan foundation ring top flange; the embedded sleeve ensures that the inner ring anchor bolt is separated from the newly poured concrete.
3. The reconstruction method suitable for the wind turbine foundation of the built old wind farm according to the claim 1, characterized in that: uniformly forming a plurality of slotted holes in the root part of a middle pier of the fan foundation along the circumferential direction, and vertically punching the top surface of the middle pier corresponding to each slotted hole downwards to form a hole channel; the outer ring anchor bolt is sleeved with the embedded sleeve and then respectively penetrates into the pore canal, the bottom end of the outer ring anchor bolt is anchored on the top surface of the groove hole through the lower anchor plate, and the top end of the outer ring anchor bolt is anchored on the top surface of the enlarged circular middle pier through the upper anchor plate; the pre-buried sleeve ensures that the outer ring anchor bolt is separated from the newly poured concrete.
4. The reconstruction method suitable for the wind turbine foundation of the built old wind farm according to claim 3, characterized by comprising the following steps: high-strength grouting is carried out at the chiseled slotted hole to ensure compactness.
5. The reconstruction method suitable for the wind turbine foundation of the built old wind farm according to the claim 1, characterized in that: when enlarging circular middle pier and pouring, pour and make and form annular cavity in order to avoid newly concreting and top flange contact around the fan basis ring top flange to the tensioning force of inner circle crab-bolt can transmit inside original fan basis through the foundation ring.
6. The reconstruction method suitable for the wind turbine foundation of the built old wind farm according to claim 1, characterized by comprising the following steps: the fan foundation of the built old wind power plant is circular or polygonal.
7. The application of the wind turbine foundation which is modified according to the modification method suitable for the wind turbine foundation of the built old wind farm in claim 1 and is used as a concrete tower foundation or a steel tower foundation.
8. Use according to claim 7, characterized in that: when the tower on the upper portion of the modified foundation is a concrete tower, a plurality of cavities are uniformly formed in the lower portion of the edge of the enlarged circular middle pier along the circumferential direction, a gear-shaped reinforcing pier is formed at the position without the cavity, the cavity space meets the normal construction of tensioning equipment, steel pipes are embedded in concrete on the upper portion of each cavity, steel strands of the concrete tower penetrate through the embedded steel pipes to the cavity, the bottom end of the concrete tower is anchored to the top surface of the cavity after the concrete tower is tensioned in the cavity, and the top end of the concrete tower is anchored to the concrete tower, so that the concrete tower is connected with the modified fan foundation.
9. Use according to claim 7, characterized in that: when the tower on foundation upper portion was the steel tower after the transformation, enlarged circular middle pier in the existing structure upper portion installation conventional crab-bolt cage of fan foundation before new concreting, bury underground in new concreting, the embedded sleeve pipe of every crab-bolt of crab-bolt cage guarantees that crab-bolt cage crab-bolt and new concreting separate, the upper end anchor is in steel tower bobbin base flange after crab-bolt cage crab-bolt stretch-draw, the lower extreme anchor is in crab-bolt cage anchor board, realizes being connected of steel tower and the fan foundation after the transformation.
10. Use according to any one of claims 7-9, characterized in that: after concrete pouring and maintenance are finished, the inner circle of anchor bolts and the outer circle of anchor bolts are used for expanding the top surface of the circular middle pier for tensioning and anchoring, the tensioning force of the anchor bolts is transmitted to the interior of the original structure of the fan foundation, so that the new concrete and the old concrete are tightly combined, and the integrity and the safety of the improved fan foundation are ensured.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464221A (en) * | 2023-04-27 | 2023-07-21 | 青岛华斯壮能源科技有限公司 | Steel pipe concrete external prestress structure, wind power tower and installation method |
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