CN114592536A - Fan foundation transformation structure and construction method - Google Patents
Fan foundation transformation structure and construction method Download PDFInfo
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- CN114592536A CN114592536A CN202210288727.9A CN202210288727A CN114592536A CN 114592536 A CN114592536 A CN 114592536A CN 202210288727 A CN202210288727 A CN 202210288727A CN 114592536 A CN114592536 A CN 114592536A
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- 238000010276 construction Methods 0.000 title claims abstract description 16
- 230000009466 transformation Effects 0.000 title claims description 9
- 239000004567 concrete Substances 0.000 claims abstract description 58
- 230000002787 reinforcement Effects 0.000 claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 13
- 239000004917 carbon fiber Substances 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 11
- 239000011241 protective layer Substances 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000011253 protective coating Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000009933 burial Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011150 reinforced concrete Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
- E02D27/44—Foundations for machines, engines or ordnance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/30—Wind power
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Abstract
The invention discloses a fan foundation reconstruction structure and a construction method, and relates to the technical field of fan foundations, wherein the fan foundation reconstruction structure comprises a foundation ring which exceeds the set height of an existing foundation, an overhanging plate is circumferentially arranged on the foundation ring, a reinforcement cage is arranged between the overhanging plate and the existing foundation, and the reinforcement cage is fixed with the existing foundation through post-cast concrete; and a plurality of circles of anchor bolt groups which are inserted into the existing foundation through post-cast concrete are arranged in the direction vertical to the overhanging plate. According to the invention, the reinforcement cage is arranged between the outer side of the foundation ring and the existing foundation external expansion structure, and the post-cast concrete forms a reinforcing structure, so that the connection strength of the foundation is increased.
Description
Technical Field
The invention relates to the technical field of fan foundations, in particular to a fan foundation transformation structure and a construction method.
Background
The weak part of the wind turbine foundation is generally a foundation column part, and along with the increase of power for replacing a new wind turbine, the design load borne by the upper part of the foundation is also increased, so that the wind turbine foundation needs to be modified. The prior art discloses a method and a structure for reforming an existing foundation ring type fan foundation, which are characterized in that original reinforced concrete in an existing foundation ring is hollowed, and a hole is drilled at the bottom of the inner part of the existing foundation ring for planting a rib; excavating original reinforced concrete in the existing foundation ring, and drilling holes at the bottom of the inner part of the existing foundation ring for planting ribs; and pouring new reinforced concrete again to the inner part of the excavated existing foundation ring.
Although above-mentioned scheme utilizes former fan machine position to carry out the transformation of existing basis, the chisel of the inside concrete of foundation ring removes very difficultly, has increased the construction degree of difficulty and cost. The large-power fan is generally replaced after the existing wind field is transformed, the outer diameter of a fan tower barrel is generally increased, and large-power crushing equipment is needed for chiseling concrete inside a foundation ring, so that gaps between the foundation ring and the external concrete are easily caused, the connection strength of the foundation ring and a foundation is greatly reduced, and the operation safety of the fan is influenced; and the requirement cannot be met by adopting the internal composite connection.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a fan foundation reconstruction structure and a construction method.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the invention provides a fan foundation reconstruction structure, which comprises a foundation ring, wherein the height of the foundation ring exceeds the set height of an existing foundation, an overhanging plate is circumferentially arranged on the foundation ring, a reinforcement cage is arranged between the overhanging plate and the existing foundation, and the reinforcement cage is fixed with the existing foundation through post-cast concrete; and a plurality of circles of anchor bolt assemblies inserted into the existing foundation through post-cast concrete are arranged in the direction perpendicular to the overhanging plate.
As a further implementation, the anchor assembly includes an anchor, an end plate connected to a distal end of the anchor.
As a further implementation, the anchor bolt sleeves are provided with springs, and the springs are provided between the end plates and the existing foundation.
As a further implementation mode, a protective layer is arranged at the interface of the post-cast concrete and the existing foundation.
As a further implementation manner, the protective layer is a rubber layer or a carbon fiber cloth.
As a further realization mode, the outer wall of the foundation ring is fixed with a pin or a stiffening plate which is vertical to the axis of the foundation ring.
As a further implementation manner, the post-cast concrete is radially arranged between the foundation ring and the existing foundation outward-expanding section, and an anchor bolt is buried in the post-cast concrete corresponding to the existing foundation outward-expanding section.
As a further implementation mode, one end of the overhanging plate is connected with the top edge of the foundation ring, and the other end of the overhanging plate is flush with the existing foundation flaring segment.
In a second aspect, an embodiment of the present invention further provides a construction method of a wind turbine foundation reconstruction structure, including:
determining parameters of an additional anchor bolt component and determining the size of diameter increase of the table column and reinforcing bars based on the checking calculation of the connection strength of the foundation ring and the checking calculation of the foundation table column;
excavating a foundation pit, and cleaning residue and debris; sticking rubber or carbon fiber cloth on the surface of the existing foundation;
adopting an anchor rod drilling machine to form a hole, embedding an anchor bolt and performing grouting operation;
placing a reinforcement cage above the existing foundation and the external expansion section and pouring concrete to the elevation of the bottom of the external extension plate;
and forming a foundation transformation structure after the concrete is maintained for a set time.
As a further implementation, the burial depth of the foundation is increased after the concrete is poured, so that the ground line is located below the foundation ring connecting flange.
The invention has the following beneficial effects:
according to the invention, the reinforcement cage and the post-cast concrete are arranged between the outer side of the foundation ring and the existing foundation external expansion structure, and the post-cast concrete is connected with the existing foundation by combining the overhanging plate and the anchor bolt, so that the connection strength and the bearing capacity of the foundation are increased, and the foundation can be suitable for replacing a high-power fan; the concrete of the existing foundation does not need to be chiseled off, and the construction difficulty and the cost are reduced.
The existing foundation and the post-cast concrete are connected through the anchor bolt component corresponding to the central convex part of the existing foundation, the anchor bolt is arranged corresponding to the post-cast concrete above the outward expansion section of the existing foundation, and the bearing capacity is improved through the anchor bolt component and the anchor bolt matched with the reinforcement cage; meanwhile, the outer side of the foundation ring is fixed with a stud or a stiffening plate, so that the radial connection strength is improved.
The anchor bolt connecting end plate can improve the anchoring strength of the anchor bolt embedded in concrete and reduce the drilling depth; in order to reduce the stress concentration effect at the anchor bolt end plate location, a spring is provided between the end plate and the top of the existing foundation.
The invention pastes rubber or carbon fiber cloth on the interface of new and old concrete, thereby avoiding the steps of chiseling the foundation and the like and reducing the construction difficulty and the construction period.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic block diagram of the present invention according to one or more embodiments;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a top view of the present disclosure according to one or more embodiments;
FIG. 4 is a schematic illustration of the construction of an anchor assembly according to one or more embodiments of the present invention;
the foundation comprises a foundation ring 1, a foundation ring 2, an overhanging plate 3, a stud 4, a fan cylinder wall 5, an anchor bolt 6, a reinforcement cage 7, post-cast concrete 8, an interface 9, a protective layer 10, a ground line 11, an end plate 12, a spring 13 and an existing foundation.
Detailed Description
The first embodiment is as follows:
the embodiment provides a fan foundation reconstruction structure, and as a column part of an original foundation belongs to a weak part when a new fan is replaced, the weak part is reinforced and reconstructed to improve the bearing capacity; the connection strength of the fresh air fan and the foundation is enhanced through the combined connection of the overhanging plate 2, the foundation ring 1 and the anchor bolt 5.
Specifically, as shown in fig. 1 and 2, the steel bar cage comprises a foundation ring 1, an overhanging plate 2, a steel bar cage 6 and an anchor bolt assembly, wherein the top of the foundation ring 1 exceeds an existing foundation 13 by a certain height, and the overhanging plate 2 is arranged along the circumferential direction of the foundation ring 1; in the present embodiment, the overhang plate 2 is arranged along the top edge of the foundation ring 1 toward the outside, and the overhang plate 2 is parallel to the top surface of the existing foundation 13.
In fig. 1, L1 is the foundation burial depth, L2 is the diameter of the foundation slab, and 2% represents the drainage slope.
The top of the outward extending plate 2 is connected with a fan cylinder wall 4; to adapt to the shape of the foundation ring 1, the extension plate 2 is of annular configuration, the inner ring of which is fixed, for example by bolts, to the top edge of the foundation ring 1. The overhang plate 2 may be a steel plate or other metal plate as long as the strength requirement can be satisfied.
The column structure of the existing foundation 13 is provided with a central bulge and a column expanding structure arranged at the bottom of the central bulge, and an outward expanding section is formed at the junction of the central bulge and the column expanding structure. The length of the external expanding section is determined through checking calculation of the connection strength of the foundation ring and checking calculation of the foundation column.
As shown in fig. 2 and 3, the end of the overhanging plate 2 far away from the foundation ring 1 is flush with the edge (the end far away from the central bulge) of the existing foundation flaring segment, and a reinforced area is formed between the two. Set up steel reinforcement cage 6 in the reinforcement region, 6 tip of steel reinforcement cage is the same with the outer section edge parallel and level that expands of existing basis, forms reinforced structure through pouring concrete 7 behind the setting in the reinforcement region, improves the column bearing capacity.
The transverse length of the existing foundation external expansion section is designed according to the acting force for replacing the foundation of the fan.
Because the radial length of overhanging plate 2 aligns with the outer section edge that expands of existing basis 13, increase overhanging plate 2 and post-cast concrete 7's area of contact, effectively reduce the effort that the fan produced surface concrete, satisfy joint construction's requirement simultaneously.
The strength grade of the post-cast concrete 7 is not lower than that of the existing foundation 13, and materials such as steel fibers and carbon fibers can be added to improve the performance of the concrete.
In order to strengthen the connection strength between the post-cast concrete 7 and the existing foundation 13, the overhanging plate 2 is annularly provided with a plurality of rings of anchor bolt assemblies, the anchor bolt assemblies are provided with a plurality of rings along the central bulge of the existing foundation 13, and the anchor bolt assemblies are sequentially connected with the overhanging plate 2, the post-cast concrete 7 and the central bulge of the existing foundation 13.
Since the existing foundation 13 has an outward-expanding section, the post-cast concrete 7 between the outward-extending plate 2 and the outward-expanding section is provided with one or more rings of anchor bolts 5, where the anchor bolts 5 do not extend into the existing foundation 13.
The centre of this embodiment through post-cast concrete 7 and existing basis 13 is protruding to pass through the crab-bolt subassembly and is connected, and the post-cast concrete 7 part that the existing basis 13 expands the section and corresponds sets up crab-bolt 5 outward, makes basic effort transmit to the basis by foundation ring 1 and crab-bolt 5 jointly on, and then transmit to the ground.
As shown in fig. 4, the anchor bolt assembly includes an anchor bolt 5 and a spring 12, the anchor bolt 5 connecting the central projection of the existing foundation 13 with the overhanging plate 2 and the end of the anchor bolt 5 corresponding to the upper part of the extended section of the existing foundation 13 are both connected with an end plate 11, the end plate 11 is a circular plate with a diameter larger than that of the anchor bolt 5, the anchoring strength of the anchor bolt 5 embedded in the concrete is improved through the end plate 11, and the drilling depth is reduced. The end plate 11 may be a steel plate or other metal plate.
The spring 12 is sleeved outside the anchor bolt 5 and between the end plate 11 and the top surface of the existing foundation 13, and the stress concentration effect near the end plate 11 is reduced by the spring 12.
In order to increase the connection strength between the foundation ring 1 and the post-cast concrete 7, the outer wall of the foundation ring 1 is fixed with the studs 3 or the stiffening plates vertical to the axis of the foundation ring 1, and the studs 3 or the stiffening plates are arranged in multiple layers at intervals along the height direction of the foundation ring 1.
In this embodiment, the interface 8 between the post-cast concrete 7 and the existing foundation 13 is provided with a protective layer, the protective layer is a rubber layer or carbon fiber cloth, and the rubber or carbon fiber cloth has a high elastic modulus and has a good control effect on fine deformation such as temperature cracks and rusty cracks. Rubber or carbon fiber cloth are arranged on the interface 8 of the new concrete and the old concrete, so that a chiseling mode can be avoided, and the construction difficulty is reduced. The carbon fiber cloth also plays a role in a hoop effect, and reduces the cracking of the concrete of the original column.
In the embodiment, under the condition that the original foundation is not damaged, the rear pouring concrete 7 is arranged from the outer side of the foundation ring 1 to the outer expansion section of the existing foundation 13, the rear pouring concrete 7 is connected with the existing foundation 13 through the anchor bolt assembly and is connected with the foundation ring 1 through the stud 3 or the stiffening plate, and the bearing capacity of the foundation can be obviously improved.
The basic acting force of this embodiment is undertaken jointly by foundation ring 1, original pillar crab-bolt structure (crab-bolt subassembly) and hole enlargement pillar crab-bolt structure (the crab-bolt that is corresponding to the section that expands outward) triplex, can set up crab-bolt number of turns, every ring crab-bolt quantity and crab-bolt diameter according to the size of new fan basic acting force. The overall rigidity of the table column can be obviously improved by arranging the diameter increasing part (the outward expanding section) of the table column, the stress level of concrete is reduced, and the width of a crack is controlled.
Example two:
the embodiment provides a construction method of a fan foundation reconstruction structure, which comprises the following steps:
step 1: adopt new fan foundation effort, carry out foundation ring 1 joint strength check computation and basic platform column check computation, confirm the quantity and the number of turns isoparametric of addding crab-bolt 5, confirm the platform column and increase footpath size and arrangement of reinforcement.
Step 2: and (5) excavating a foundation pit and cleaning residues and fragments.
And step 3: rubber or carbon fiber cloth is adhered to the surface of the existing foundation 13, so that the adhesion strength of the new and old concrete connection structure is ensured.
In this embodiment, rubber or carbon fiber cloth is adhered along the periphery of the existing foundation 13, the concrete surface is treated, primer is brushed, local surface leveling work is done, impregnating glue is prepared, and the rubber or carbon fiber cloth is adhered.
And 4, step 4: and (4) adopting an anchor rod drilling machine to form a hole, then embedding an anchor bolt 5 and performing grouting operation.
In order to ensure the quality of grouting construction, a space which is large enough is arranged between the anchor bolt 5 and the wall of the anchor hole, and the diameter of the anchor hole is not easy to be less than 2.5 times of the diameter of the anchor bar.
Roofbolter drills on existing basis 13, and roofbolter has the reaming function, can carry out the reaming with anchor eye bottom or middle part, then buries crab-bolt 5 and carries out the slip casting operation, sets up crab-bolt 5 between existing basis 13 and post-cast concrete 7 and the section of expanding outward, can set up the number of turns of crab-bolt according to actual conditions.
In this embodiment, a static drilling mode is adopted for drilling, drilling positions and models are marked according to design requirements, drilling is generally performed perpendicular to the surface of a foundation, the depth is not less than 15d, and dust in holes is removed after drilling is completed.
And 5: and placing a reinforcement cage 6 above the existing foundation 13 and the external expansion section of the foundation column, and pouring concrete to the height of the bottom of the overhanging plate 2.
Step 6: and after the concrete is cured, hoisting the first section (comprising the overhanging plate 2) of the fan tower.
After the concrete is poured, the foundation can be covered with soil, generally about 600mm, and the burial depth of the foundation can be increased by the aid of the measures.
And when the strength of the concrete reaches the requirement, the fan barrel can be installed. During installation, the anchor bolts 5 and the foundation ring 1 are connected respectively.
Because the fan foundation is easy to deform and overturn under the action of horizontal load and bending moment, the burial depth of the foundation can be increased after concrete is poured, and the ground line 10 is located below the foundation ring connecting flange, so that the overturning resistance of the foundation can be improved.
This embodiment reduces the compressive stress that the fan produced the basis through the area of contact of increase outrigger 2 and post-cast concrete 7, satisfies crab-bolt structural connection requirement, and fan wall outside steel sheet can adopt than the steel sheet, guarantees joint strength reduction material quantity.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A fan foundation transformation structure is characterized by comprising a foundation ring which exceeds the set height of an existing foundation, wherein an overhanging plate is arranged on the periphery of the foundation ring, a reinforcement cage is arranged between the overhanging plate and the existing foundation, and the reinforcement cage is fixed with the existing foundation through post-cast concrete; and a plurality of circles of anchor bolt assemblies inserted into the existing foundation through post-cast concrete are arranged in the direction perpendicular to the overhanging plate.
2. A wind turbine infrastructure according to claim 1, wherein the anchor assembly comprises an anchor, an end plate connected to the end of the anchor.
3. The wind turbine foundation transformation structure of claim 2, wherein the anchor bolt sleeve is provided with a spring, and the spring is arranged between the end plate and the existing foundation.
4. A wind turbine foundation reconstruction structure as claimed in claim 1, wherein the interface of the post cast concrete and the existing foundation is provided with a protective coating.
5. The wind turbine foundation reconstruction structure of claim 4, wherein the protective layer is a rubber layer or a carbon fiber cloth.
6. A wind turbine foundation modification structure according to claim 1, wherein the outer wall of the foundation ring is fixed with studs or stiffening plates perpendicular to the axis of the foundation ring.
7. The wind turbine foundation reconstruction structure of claim 1, wherein the post-cast concrete is radially disposed between the foundation ring and the existing foundation flared section, and anchor bolts are embedded in the post-cast concrete corresponding to the existing foundation flared section.
8. The wind turbine infrastructure transformation structure of claim 7, wherein the overhang board has one end connected to the top edge of the foundation ring and the other end flush with the existing foundation flared section.
9. The construction method of the wind turbine foundation reconstruction structure according to any one of claims 1 to 8, comprising:
determining parameters of the additionally arranged anchor bolt component and determining the diameter increasing size and the reinforcing bars of the platform column based on the checking calculation of the connection strength of the foundation ring and the checking calculation of the foundation platform column;
excavating a foundation pit, and cleaning residue and debris; sticking rubber or carbon fiber cloth on the surface of the existing foundation;
adopting an anchor rod drilling machine to form a hole, embedding an anchor bolt and performing grouting operation;
placing a reinforcement cage above the existing foundation and the external expansion section, and pouring concrete to the height mark at the bottom of the external expansion plate;
and forming a foundation transformation structure after the concrete is maintained for a set time.
10. The method of claim 9, wherein the depth of the foundation is increased after the concrete is poured, and the ground line is located below the base ring flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210288727.9A CN114592536A (en) | 2022-03-23 | 2022-03-23 | Fan foundation transformation structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210288727.9A CN114592536A (en) | 2022-03-23 | 2022-03-23 | Fan foundation transformation structure and construction method |
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| CN202210288727.9A Pending CN114592536A (en) | 2022-03-23 | 2022-03-23 | Fan foundation transformation structure and construction method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160097179A1 (en) * | 2014-10-07 | 2016-04-07 | Allan P. Henderson | Retrofit reinforcing structure addition and method for wind turbine concrete gravity spread foundations and the like |
| CN213836718U (en) * | 2020-09-17 | 2021-07-30 | 武大巨成结构股份有限公司 | Improved fan foundation |
| WO2021184746A1 (en) * | 2020-03-16 | 2021-09-23 | 中国华能集团清洁能源技术研究院有限公司 | Wind turbine base having composite cylindrical structure |
| CN113833008A (en) * | 2021-08-23 | 2021-12-24 | 山东电力工程咨询院有限公司 | Method and structure for transforming existing foundation ring type fan foundation |
-
2022
- 2022-03-23 CN CN202210288727.9A patent/CN114592536A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160097179A1 (en) * | 2014-10-07 | 2016-04-07 | Allan P. Henderson | Retrofit reinforcing structure addition and method for wind turbine concrete gravity spread foundations and the like |
| WO2021184746A1 (en) * | 2020-03-16 | 2021-09-23 | 中国华能集团清洁能源技术研究院有限公司 | Wind turbine base having composite cylindrical structure |
| CN213836718U (en) * | 2020-09-17 | 2021-07-30 | 武大巨成结构股份有限公司 | Improved fan foundation |
| CN113833008A (en) * | 2021-08-23 | 2021-12-24 | 山东电力工程咨询院有限公司 | Method and structure for transforming existing foundation ring type fan foundation |
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