CN112177036A - Height-adjustable modular prestressed fan foundation and construction method thereof - Google Patents
Height-adjustable modular prestressed fan foundation and construction method thereof Download PDFInfo
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- CN112177036A CN112177036A CN202011268100.4A CN202011268100A CN112177036A CN 112177036 A CN112177036 A CN 112177036A CN 202011268100 A CN202011268100 A CN 202011268100A CN 112177036 A CN112177036 A CN 112177036A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000009417 prefabrication Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
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- 125000006850 spacer group Chemical group 0.000 description 2
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- 238000009412 basement excavation Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
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Abstract
The invention discloses a height-adjustable modularized prestressed fan foundation which comprises a plurality of splicing units, wherein the splicing units are sequentially spliced along the horizontal direction to form a closed annular structure, and each splicing unit consists of a central part and a flange part extending to the outer side of the central part; the horizontal connecting piece comprises a first fastening bolt and a second fastening bolt which are arranged at the central part, and a third fastening bolt which is arranged at the flange part, and the first fastening bolt, the second fastening bolt and the third fastening bolt are all used for connecting adjacent splicing units; the prestress locking assembly comprises a longitudinal anchor rod arranged at the central part, an upper anchor plate arranged on the top surface of the central part and a lower anchor plate arranged on the bottom surface of the central part, wherein the longitudinal anchor rod is fixedly connected with the upper anchor plate and the lower anchor plate. The invention can combine the mass production of each module and the field assembly through factory prefabrication, greatly improves the construction speed and shortens the construction period; the height of the central part can be flexibly adjusted according to construction requirements so as to meet flood control requirements of projects.
Description
Technical Field
The invention relates to the technical field of tower tube foundations for wind driven engines, in particular to a height-adjustable modular prestressed fan foundation and a construction method thereof.
Background
In recent years, with the continuous optimization and adjustment of national energy structures, the wind power generation in the new energy category is emphasized, and in addition, the national policy is strongly supported in all aspects, and the domestic wind power generation is rapidly developed. The traditional fan foundation comprises a rib beam foundation, an expansion foundation, an anchor rod foundation and the like, the steel bars are complex to bind and time-consuming, the template support is complex, and the construction quality and progress are difficult to guarantee; secondly, the foundation earthwork and the cast-in-place concrete have large engineering quantity, and have great influence on water and soil conservation and environment; thirdly, when a wind power plant is built in a beach area, the problem of flood control needs to be considered, but the traditional wind turbine foundation cannot meet the flood control requirement; finally, the existing wind turbine is high in investment labor and construction cost during construction, and after the operation period of the wind power plant is over, the foundation of the wind turbine cannot be recycled, so that a great amount of resources are wasted.
Disclosure of Invention
In order to solve the problems, the invention provides a modularized prestressed fan foundation with adjustable height, which has low manufacturing cost, high construction speed, small environmental influence, safety and stability, flood control and recoverability, and a construction method of the fan foundation, and the construction method can specifically adopt the following technical scheme:
the invention relates to a height-adjustable modularized prestressed fan foundation, which comprises
The splicing units are sequentially spliced along the horizontal direction to form a closed annular structure, and each splicing unit consists of a central part and a flange part extending to the outer side of the central part;
the horizontal connecting piece comprises a first fastening bolt and a second fastening bolt which are arranged at the central part, and a third fastening bolt which is arranged at the flange part, and the first fastening bolt, the second fastening bolt and the third fastening bolt are all used for connecting adjacent splicing units;
the prestress locking assembly comprises a longitudinal anchor rod arranged at the central part, an upper anchor plate arranged on the top surface of the central part and a lower anchor plate arranged on the bottom surface of the central part, wherein the longitudinal anchor rod is tightly and fixedly connected with the upper anchor plate and the lower anchor plate.
The splicing surface of the central part is provided with a first mounting hole matched with the first fastening bolt and a second mounting hole matched with the second fastening bolt, the first mounting hole is arranged close to the outer side wall of the central part and communicated with the first mounting groove arranged on the outer side wall of the central part, and the second mounting hole is arranged close to the inner side wall of the central part and communicated with the second mounting groove arranged on the inner side wall of the central part; and rib beams are arranged on the splicing surfaces of the flange parts, and third mounting holes matched with the third fastening bolts are formed in the rib beams.
The tail end of the rib beam extends to the outer edge of the flange part, a partition beam with the end part connected with the tail end of the rib beam is arranged on the flange part, and the partition beam and the rib beams on the two sides form a counterweight cavity.
And a first positioning pair and a second positioning pair are arranged on the splicing surface of the flange part.
The first positioning pair comprises a male groove arranged on the splicing surface on one side of the flange part and a female groove arranged on the splicing surface on the other side and matched with the male groove.
The second positioning pair comprises a positioning rod arranged on the splicing surface on one side of the flange part and an insertion hole which is arranged on the splicing surface on the other side and matched with the positioning rod.
The PVC corrugated pipe is arranged on the inner wall of the longitudinal through hole, a steel strand is wound on the longitudinal anchor rod and arranged in the corrugated pipe, and the longitudinal anchor rod and the corrugated pipe are fixedly connected together through grouting cement.
The central portion includes a fixed section at a lower portion and an elevated section at an upper portion.
And a longitudinal water stop strip between the longitudinal anchor rod and the first fastening bolt is arranged on the longitudinal splicing surface of the central part, and an annular water stop strip between the longitudinal anchor rod and the second fastening bolt is arranged on the transverse splicing surface of the central part.
A construction method of a modular prestressed fan foundation with adjustable height comprises the following steps:
firstly, excavating a foundation pit, and pouring a concrete cushion layer at the bottom of the foundation pit;
secondly, hoisting the assembly units one by one to a preset position, completing assembly, then sequentially installing a third fastening bolt, a second fastening bolt and a first fastening bolt, and fastening the third fastening bolt, the second fastening bolt and the first fastening bolt according to the sequence of starting from odd number to even number and starting from up and down simultaneously; then installing a prestress locking assembly;
and thirdly, backfilling the foundation pit, judging whether backfilling is carried out in the center of the closed annular structure formed by the assembling units according to geological conditions, and carrying out layered compaction on the backfilled soil until the backfilled soil is flush with the zero ground surface, so that construction is finished.
The height-adjustable modularized prestressed fan foundation provided by the invention can be used for combining batch production of modules through factory prefabrication and field assembly, so that the construction speed is greatly increased, and the construction period is shortened; the height of the central part can be flexibly adjusted according to construction requirements so as to meet flood control requirements of projects; in addition, the project investment cost can be reduced by recycling and reusing each assembly unit; the wind turbine foundation adopting the structure saves materials and has low investment during construction, the hoisting and installation are quick and convenient, and the flood control requirement when a wind power plant is built in a mudflat area is greatly met.
Compared with the prior art, the invention has the following advantages:
1. the central part of the assembly unit is divided into an upper section and a lower section, the height can be adjusted according to the flood control requirement, the safety of the wind power plant is greatly improved, and the height of the steel tower cylinder can be reduced by heightening the bearing platform (namely the central part), so that the integral rigidity of the tower cylinder is improved, the noise and the vibration of the tower cylinder can be effectively reduced, the environment protection and the increase of the generated energy are facilitated;
2. the splicing units are all connected by bolts, so that the mechanical operation degree is high, the construction working face is reduced by more than half compared with the traditional method, and the labor input is low; various positioning mechanisms are arranged among the assembling units, so that the positioning is convenient, the fit degree among the modules is high, and the integral stress is uniform;
3. the lower anchor plate is connected with the height adjusting bolt, so that the installation space of the anchor rod can be flexibly controlled, and the anchor rod is more convenient to install;
4. according to the invention, the steel stranded wires are wound on the vertical anchor rods to form the prestress mixed anchor rods, and the prestress mixed anchor rods have the mixed characteristic of the anchor rods and the anchor cables when stressed, can bear larger upper load, can reduce the steel consumption of the anchor rods, and have stronger applicability to foundation bearing platforms with different heights;
5. the PVC corrugated pipe is arranged on the inner wall of the anchor rod mounting hole, so that the anchor rod and the foundation can be fused more fully, the stress condition of the anchor rod is adjusted, and the maintenance workload of the anchor rod is reduced;
6. when the fan foundation is installed, various connecting bolts are fastened according to a certain sequence, so that the connecting structure of the splicing units is optimized, and the fan foundation is stressed more uniformly;
7. the modularized adjustable fan foundation belongs to a prefabricated splicing product, and each part is very convenient to split and move, is flexible and simple to mount and can be recycled;
8. the flange part of the assembly unit is provided with a triangular counterweight cavity consisting of the partition beam and the rib beam, and different grades of sand and stone or local materials can be adopted for counterweight according to the upper load of the fan foundation, so that the consumption of concrete is reduced, and the construction cost is further reduced;
9. the assembly module is produced in a factory, concrete does not need to be poured on site, the construction process is simple, and the construction progress is guaranteed; because the installation working surface is small, the foundation excavation range is small, the influence on water, soil and environment can be greatly reduced, and the current increasingly strict construction requirements are met;
10. the water stop strips are arranged between the splicing surfaces of the splicing units, so that the durability and the corrosion resistance of the fan foundation are greatly improved.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention.
Fig. 2 is a plan view of fig. 1 (without backfill).
Fig. 3 is an enlarged view of the center portion of fig. 2.
Fig. 4 is a schematic structural diagram of embodiment 2 of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the drawings, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the scope of the present invention is not limited to the following embodiments.
Example 1:
as shown in fig. 1 to 3, the height-adjustable modular prestressed fan foundation of the present invention comprises eight assembled units (the number of which can be adjusted according to specific conditions), wherein the assembled units have the same structure, are sequentially assembled along the horizontal direction, and are fastened and connected by a horizontal connecting member and a prestressed locking component to form a hollow closed ring structure. Each assembling unit consists of a central part and a flange part extending outside the central part, the central part is higher, the top of the central part is used for installing a fan (namely a fan bearing platform), the flange part is arranged for improving the stability of the central part, and meanwhile, the flange part can be assembled, positioned and fastened by arranging a relevant mechanism on the flange part.
Specifically, every flange portion of assembling the unit all includes the extension setting at the bottom plate 1.1 in the central part outside, the rib 1.2 of setting on the splice face of bottom plate 1.1 both sides, and constitute with the spacer beam 1.3 of rib 1.2 end connection together, above-mentioned rib 1.2 end extends to bottom plate 1.1 edge, its triangle-shaped counter weight chamber that constitutes with spacer beam 1.3 can hold different grades of grit or draw materials the counter weight on the spot, reduce the concrete volume, be favorable to reducing engineering cost. In order to facilitate splicing and positioning of the splicing units, a first positioning pair 2.1 and a second positioning pair 2.2 are arranged on a splicing surface of the flange part, the first positioning pair comprises a male groove arranged on the rib beam 1.2 on one side and a female groove arranged on the rib beam 1.2 on the other side, and the male groove and the female groove correspond in position and are adaptive in shape. The second location is to 2.2 including setting up the locating lever on bottom plate 1.1 one side concatenation face and setting up the cartridge hole on bottom plate 1.1 opposite side concatenation face, and this locating lever and cartridge hole position correspond, mutual adaptation. The positioning mechanism can guarantee the splicing accuracy of the splicing units in all directions, and reduces uneven stress of the fan foundation caused by installation dislocation.
The horizontal connecting piece comprises a first fastening bolt 3.1 and a second fastening bolt 3.2 for connecting the central parts of the adjacent splicing units, and a third fastening bolt 3.3 for connecting the adjacent rib beams 1.2. Wherein, the first fastening bolt 3.1 is arranged close to the outer side of the central part and adopts a straight bolt; the second fastening bolt 3.2 is arranged close to the inner side of the central part and is a bent bolt. In order to facilitate the installation of the first fastening bolt 3.1, two first installation holes matched with the first fastening bolt 3.1 and two second installation holes matched with the second fastening bolt 3.2 are respectively formed in the splicing surfaces on the two sides of the central part, and two first installation grooves 3.4 are formed in the outer side wall of the central part, are respectively communicated with the two first installation holes, are used for penetrating through the straight bolt and are screwed with fastening nuts at the end part of the straight bolt; similarly, in order to facilitate the installation of the second fastening bolt 3.2, two second installation grooves 3.5 are formed on the inner side wall of the central portion, and are respectively communicated with the two second installation holes. Each rib beam 1.2 of the assembly unit is provided with a third mounting hole matched with the third fastening bolt 3.3, and the third mounting holes are arranged in a row and in multiple rows in general. PVC pipes are sleeved on the inner walls of the insertion holes, the first mounting holes, the second mounting holes and the third mounting holes.
The prestressed locking assembly comprises a longitudinal anchor rod 4.1 arranged in the central part, an upper anchor plate 4.2 arranged on the top surface of the central part and a lower anchor plate 4.3 arranged on the bottom surface of the central part. The upper anchor plate 4.2 and the lower anchor plate 4.3 are both annular plates. Wherein, the longitudinal anchor rod 4.1 is wound with steel strands to form a prestressed anchor rod, which is installed in a longitudinal through hole arranged at the central part in a way of grouting cement, and the inner wall of the longitudinal through hole is sleeved with a PVC corrugated pipe so as to be fully fused with the longitudinal anchor rod 4.1 and the central part. During installation, the lower anchor plate 4.3 is placed below the central portion, the height of the lower anchor plate 4.3 is adjusted through the height adjusting bolt 4.4, and then the longitudinal anchor rod 4.1, the lower anchor plate 4.3 and the upper anchor plate 4.2 are connected together through the nut.
In order to prevent water flow from entering the joint to corrode metal parts, a longitudinal water stop strip 5.1 is arranged on the longitudinal splicing surface of the central part and between the longitudinal anchor rod 4.1 and the first fastening bolt 3.1.
Example 2:
in order to cope with the flood protection problem, simplify the construction and reduce the investment cost, the central part is prefabricated into two parts, namely a fixed section 6.1 positioned at the lower part and a flange part which are connected together and a separately prefabricated height-adjusting section 6.2 positioned at the upper part. Under the condition of meeting the splicing requirement, the dividing number of the heightening sections 6.2 is reduced under the condition of keeping the splicing structure and the locking structure unchanged, and large-volume prefabrication is carried out, so that the prefabrication workload and the hoisting workload are reduced. When assembling heightening section 6.2 and fixed section 6.1, go up anchor slab 4.2 and be located heightening section 6.2's top surface, anchor slab 4.3 is located fixed section 6.1's bottom surface down, and vertical stock 4.1 passes heightening section 6.2 and fixed section 6.1 simultaneously and fastens both, and should install the hoop waterstop 5.2 that is located between vertical stock 4.1 and the second fastening bolt 3.2 on horizontal concatenation face between them. The same portions as in example 1 were used.
The construction method of the modular prestressed fan foundation with the adjustable height comprises the following steps:
firstly, excavating a foundation pit, and pouring a concrete cushion layer at the bottom of the foundation pit;
secondly, hoisting the assembly units one by one to a preset position, completing assembly, then sequentially installing a third fastening bolt, a second fastening bolt and a first fastening bolt, and fastening the third fastening bolt, the second fastening bolt and the first fastening bolt according to the sequence of starting from odd number to even number and starting from up and down simultaneously; then installing a prestress locking assembly;
and thirdly, backfilling the foundation pit, judging whether backfilling is carried out in the center of the closed annular structure formed by the assembling units according to geological conditions, and carrying out layered compaction on the backfilled soil until the backfilled soil is flush with the zero ground surface, so that construction is finished.
Specifically, the following explains the specific construction steps with the wind turbine foundation described in embodiment 2:
firstly, excavating a foundation pit, pouring a concrete cushion layer at the bottom of the foundation pit, wherein the cushion layer is required to be leveled so as to facilitate the positioning, assembly and fastening of the assembly units and ensure that the assembled fan foundation is uniformly stressed;
secondly, installing the longitudinal water stop strips 5.1 at corresponding positions of each assembly unit, hoisting the assembly units comprising the fixed sections 6.1 one by one, placing the assembly units at preset positions, completing positioning and assembly through matched positioning rods, insertion holes, female grooves and male grooves, then sequentially installing third fastening bolts 3.3 at rib beams, second fastening bolts 3.2 at the inner side of the central part and first fastening bolts 3.1 at the outer side of the central part, and fastening the third fastening bolts 3.3, the second fastening bolts 3.2 and the first fastening bolts 3.1 according to the sequence of starting from odd number to even number and starting from top to bottom simultaneously; then, a lower anchor plate 4.3 and a longitudinal anchor rod 4.1 are installed, a circumferential water stop strip 5.2 is installed at the corresponding position of the upper surface of the assembled fixing section 6.1, then the assembling units formed by the height-adjusting sections 6.2 are hoisted one by one, the longitudinal through hole on each assembling unit corresponds to the longitudinal anchor rod 4.1, after the height-adjusting sections 6.2 are installed on the fixing sections 6.1, the second fastening bolt 3.2 and the first fastening bolt 3.1 are used for fastening, the upper anchor plate 4.2 is installed, and the longitudinal anchor rod 4.1 is locked through a fastening nut;
and thirdly, backfilling the foundation pit, judging whether backfilling is carried out in the center of the closed annular structure formed by the assembling units according to geological conditions, and carrying out layered compaction on the backfilled soil until the backfilled soil is flush with the zero ground surface, so that construction is finished.
It should be noted that in the description of the present invention, terms of orientation or positional relationship such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Claims (10)
1. The utility model provides a height-adjustable's modularization prestressing force fan basis which characterized in that: the wind turbine foundation comprises
The splicing units are sequentially spliced along the horizontal direction to form a closed annular structure, and each splicing unit consists of a central part and a flange part extending to the outer side of the central part;
the horizontal connecting piece comprises a first fastening bolt and a second fastening bolt which are arranged at the central part, and a third fastening bolt which is arranged at the flange part, and the first fastening bolt, the second fastening bolt and the third fastening bolt are all used for connecting adjacent splicing units;
the prestress locking assembly comprises a longitudinal anchor rod arranged at the central part, an upper anchor plate arranged on the top surface of the central part and a lower anchor plate arranged on the bottom surface of the central part, wherein the longitudinal anchor rod is tightly and fixedly connected with the upper anchor plate and the lower anchor plate.
2. The modular prestressed wind turbine foundation of claim 1, wherein: the splicing surface of the central part is provided with a first mounting hole matched with the first fastening bolt and a second mounting hole matched with the second fastening bolt, the first mounting hole is arranged close to the outer side wall of the central part and communicated with the first mounting groove arranged on the outer side wall of the central part, and the second mounting hole is arranged close to the inner side wall of the central part and communicated with the second mounting groove arranged on the inner side wall of the central part; and rib beams are arranged on the splicing surfaces of the flange parts, and third mounting holes matched with the third fastening bolts are formed in the rib beams.
3. The height-adjustable modular prestressed wind turbine foundation of claim 2, wherein: the tail end of the rib beam extends to the outer edge of the flange part, a partition beam with the end part connected with the tail end of the rib beam is arranged on the flange part, and the partition beam and the rib beams on the two sides form a counterweight cavity.
4. The modular prestressed wind turbine foundation of claim 1, wherein: and a first positioning pair and a second positioning pair are arranged on the splicing surface of the flange part.
5. The height-adjustable modular prestressed wind turbine foundation of claim 4, wherein: the first positioning pair comprises a male groove arranged on the splicing surface on one side of the flange part and a female groove arranged on the splicing surface on the other side and matched with the male groove.
6. The height-adjustable modular prestressed wind turbine foundation of claim 4, wherein: the second positioning pair comprises a positioning rod arranged on the splicing surface on one side of the flange part and an insertion hole which is arranged on the splicing surface on the other side and matched with the positioning rod.
7. The modular prestressed wind turbine foundation of claim 1, wherein: the PVC corrugated pipe is arranged on the inner wall of the longitudinal through hole, a steel strand is wound on the longitudinal anchor rod and arranged in the corrugated pipe, and the longitudinal anchor rod and the corrugated pipe are fixedly connected together through grouting cement.
8. The modular prestressed wind turbine foundation of claim 1, wherein: the central portion includes a fixed section at a lower portion and an elevated section at an upper portion.
9. The height-adjustable modular prestressed wind turbine foundation of claim 8, wherein: and a longitudinal water stop strip between the longitudinal anchor rod and the first fastening bolt is arranged on the longitudinal splicing surface of the central part, and an annular water stop strip between the longitudinal anchor rod and the second fastening bolt is arranged on the transverse splicing surface of the central part.
10. The construction method of the height-adjustable modular prestressed fan foundation as claimed in claim 1, wherein: the method comprises the following steps:
firstly, excavating a foundation pit, and pouring a concrete cushion layer at the bottom of the foundation pit;
secondly, hoisting the assembly units one by one to a preset position, completing assembly, then sequentially installing a third fastening bolt, a second fastening bolt and a first fastening bolt, and fastening the third fastening bolt, the second fastening bolt and the first fastening bolt according to the sequence of starting from odd number to even number and starting from up and down simultaneously; then installing a prestress locking assembly;
and thirdly, backfilling the foundation pit, judging whether backfilling is carried out in the center of the closed annular structure formed by the assembling units according to geological conditions, and carrying out layered compaction on the backfilled soil until the backfilled soil is flush with the zero ground surface, so that construction is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011268100.4A CN112177036A (en) | 2020-11-13 | 2020-11-13 | Height-adjustable modular prestressed fan foundation and construction method thereof |
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| CN202011268100.4A CN112177036A (en) | 2020-11-13 | 2020-11-13 | Height-adjustable modular prestressed fan foundation and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113089738A (en) * | 2021-03-30 | 2021-07-09 | 中国电建集团成都勘测设计研究院有限公司 | Method for repairing pre-stressed anchor bolt foundation of tower cylinder of installed fan |
| CN114960734A (en) * | 2022-06-30 | 2022-08-30 | 华能陇东能源有限责任公司 | Connecting structure and connecting method for wind power foundation prefabricated part |
| CN114960735A (en) * | 2022-06-30 | 2022-08-30 | 华能陇东能源有限责任公司 | Construction method for onshore wind power prefabricated foundation |
| CN114960734B (en) * | 2022-06-30 | 2024-04-02 | 华能陇东能源有限责任公司 | A wind power foundation prefabricated component connection structure and connection method |
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