CN110735444B - Vertical anchor self-protection type fan foundation and construction method thereof - Google Patents
Vertical anchor self-protection type fan foundation and construction method thereof Download PDFInfo
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- CN110735444B CN110735444B CN201910985922.5A CN201910985922A CN110735444B CN 110735444 B CN110735444 B CN 110735444B CN 201910985922 A CN201910985922 A CN 201910985922A CN 110735444 B CN110735444 B CN 110735444B
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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
Abstract
The invention discloses a vertical anchor self-protection type fan foundation and a construction method thereof, wherein the method comprises the following steps: s1, arranging an anchor bolt fixing plate connected with the foundation ring on the outer periphery side of the foundation ring; s2, placing the embedded die pipe on the outer periphery of the foundation ring along the vertical direction, and connecting the foundation ring with the embedded die pipe by using a fastening sleeve penetrating through the first mounting hole; s3, hoisting the foundation ring, and binding a metal cage structure around the foundation ring; s4, placing an anchor rod in the embedded die pipe along the vertical direction, and connecting the upper end of the anchor rod with the anchor rod fixing plate; s5, pouring first concrete outside the embedded die pipe and pouring second concrete in the embedded die pipe; and S6, when the first concrete and the second concrete reach the preset strength, enabling the anchor rod to generate pretension. The vertical anchor self-protection type fan foundation and the construction method thereof aim to solve the technical problems that the stability of a fan foundation is poor and a wind driven generator is easy to stop in the prior art.
Description
Technical Field
The invention relates to the technical field of fan foundations, in particular to a vertical anchor self-protection type fan foundation and a construction method thereof.
Background
A wind turbine usually includes an upper, a middle and a lower parts, which are an upper nacelle, a blade, a middle steel tower and a lower reinforced concrete foundation. The connection of the steel structure tower and the reinforced concrete foundation has various forms, wherein the foundation ring type connection is a main connection form of the wind turbine foundation. The steel foundation ring is fixed and leveled in advance before concrete pouring, and is connected with the upper tower barrel through bolts after the concrete pouring and curing. In the operation process of the fan, the tower barrel swings and twists under the action of wind load, blade inertial load and the like, the base ring needs to bear reciprocating bending moment and torque transmitted by the tower barrel, and the bending moment and the torque are transmitted to concrete through the side wall (bonded with the concrete) and the bottom flange (bonded with the concrete and meshed with the concrete). Under the long-term action of the reciprocating load, the concrete near the side wall of the foundation ring and the lower flange is easy to generate fatigue failure, so that the concrete in the area is crushed and emptied, the amplitude of oscillation of the tower is too large, and the machine is stopped.
Disclosure of Invention
Technical problem to be solved
Based on the technical scheme, the invention provides a vertical anchor self-protection type fan foundation and a construction method thereof, and aims to solve the technical problems that in the prior art, the stability of a fan foundation is poor and a wind driven generator is easy to stop.
(II) technical scheme
In order to solve the technical problem, the invention provides a construction method of a vertical anchor self-protection type fan foundation, which comprises the following steps:
s1, arranging an anchor bolt fixing plate connected with the foundation ring on the outer periphery side of the foundation ring, wherein the foundation ring is provided with a plurality of first mounting holes at positions below the anchor bolt fixing plate, and the first mounting holes are arranged at intervals from top to bottom along the axial direction of the foundation ring;
s2, placing the embedded die pipe on the outer periphery of the foundation ring along the vertical direction, and connecting the foundation ring with the embedded die pipe by using a fastening sleeve penetrating through the first mounting hole;
s3, hoisting the foundation ring, and binding a metal cage structure around the foundation ring;
s4, placing an anchor rod in the embedded die pipe along the vertical direction, connecting the upper end of the anchor rod with the anchor rod fixing plate, and suspending the lower end of the anchor rod;
s5, pouring first concrete outside the embedded die pipe and pouring second concrete in the embedded die pipe;
and S6, when the first concrete and the second concrete reach the preset strength, enabling the anchor rod to generate pretension.
Preferably, the construction method of the vertical anchor self-protection type fan foundation comprises the following steps: in the step S4, the upper end of the anchor rod is connected to the anchor bolt fixing plate through a necking plate, the necking plate is connected to the anchor bolt fixing plate through a first threaded fastener, and the necking plate is connected to the upper end of the anchor rod through a second threaded fastener.
Preferably, the construction method of the vertical anchor self-protection type fan foundation comprises the following steps: a low ductility metal material is used as the necking plate.
Preferably, the construction method of the vertical anchor self-protection type fan foundation comprises the following steps: the brittle fracture strength of the necking plate is set to be lower than the limit strength of the bolt fatigue failure.
Preferably, the construction method of the vertical anchor self-protection type fan foundation comprises the following steps: in step S6, a pretension is generated in the anchor rod by pretensioning the anchor bolt fastening plate against the necking plate.
Preferably, the construction method of the vertical anchor self-protection type fan foundation comprises the following steps: and taking common concrete as the first concrete and taking ultra-high performance concrete as the second concrete.
In addition, the invention also provides a vertical anchor self-protection type fan foundation, wherein the vertical anchor self-protection type fan foundation is manufactured by the construction method of the vertical anchor self-protection type fan foundation.
In addition, the invention also provides a vertical anchor self-protection type fan foundation, wherein the vertical anchor self-protection type fan foundation comprises first concrete, a foundation ring arranged in the first concrete, a metal cage structure, an embedded die pipe and an anchor rod in the embedded die pipe, the embedded die pipe and the anchor rod are arranged from top to bottom in the vertical direction, an anchor rod fixing plate is connected to the outer peripheral side of the foundation ring, the upper end of the anchor rod is connected with the anchor rod fixing plate, second concrete is arranged in the embedded die pipe, and the middle section and the lower end of the anchor rod are arranged in the second concrete.
Preferably, the upper end of the anchor rod is connected with the anchor bolt fixing plate through a necking plate.
Preferably, the breakneck strength of the necking plate is lower than the threshold strength of the bolt fatigue failure.
(III) advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
because the construction method of the vertical anchor self-protection type fan foundation comprises the steps, the ultra-high performance concrete can be used as the second concrete, and the ultra-high performance concrete has excellent durability and fatigue resistance, the anchor rod, the anchor bolt fixing plate and the foundation ring can work together for a long time, the stress concentration condition of the concrete around the flange under the foundation ring is greatly reduced, and the fatigue damage of the concrete around the foundation ring can be effectively avoided.
Other advantageous effects of the present invention will be described in the following detailed description.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a general schematic view of a vertical anchor self-protecting wind turbine foundation of the present invention;
FIG. 2 is a partial top view of the vertical anchor self-protecting wind turbine foundation of the present invention;
FIG. 3 is a schematic outboard view of the foundation ring of the present invention;
FIG. 4 is a top view of the pre-buried mold pipe of the present invention;
FIG. 5 is a side view of an insert mold tube of the present invention;
FIG. 6 is a top view of the anchor fixing plate of the present invention;
fig. 7 is a side view of the anchor fixing plate of the present invention.
Description of reference numerals:
1. the foundation ring, 2, crab-bolt fixed plate, 3, first mounting hole, 4, pre-buried mould pipe, 5, metal cage structure, 6, necking down board, 7, screw rod, 8, nut, 9, first threaded fastener, 10, second threaded fastener, 11, stock, 12, first concrete, 13, second concrete, 14, the hole of pouring.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1-3, the invention discloses a construction method of a vertical anchor self-protection type fan foundation, wherein the construction method comprises the following steps:
s1, arranging an anchor bolt fixing plate 2 connected with a foundation ring 1 on the outer periphery of the foundation ring 1, wherein the foundation ring 1 is provided with a plurality of first mounting holes 3 at positions below the anchor bolt fixing plate 2, and the first mounting holes 3 are arranged at intervals from top to bottom along the axial direction of the foundation ring 1, and specifically, the anchor bolt fixing plate 2 can be welded on the outer periphery of the foundation ring 1, but the invention is not limited to the above, and other suitable connection modes also belong to the protection scope of the invention, and the first mounting holes 3 can be round holes, for example, and of course, if needed, the shape of the first mounting holes 3 can be properly adjusted, and the protection scope of the invention also falls;
s2, referring to the figures 4 and 5 specifically, the pre-buried die pipe 4 is placed on the outer periphery side of the foundation ring 1 along the vertical direction, and the foundation ring 1 is connected with the pre-buried die pipe 4 by using a fastening suite (such as a screw 7 and a nut 8) penetrating through the first mounting hole 3, wherein the pre-buried die pipe 4 is a pre-buried steel die, such as a square steel pipe, but the invention is not limited thereto;
s3, hoisting the foundation ring 1, and binding a metal cage structure 5 around the foundation ring 1, wherein the metal cage structure 5 is preferably a steel reinforcement cage, and certainly, if the metal cage structure 5 in other structural forms is adopted, the invention also belongs to the protection of the invention;
s4, referring to the figures 6 and 7 specifically, placing the anchor rod 11 in the pre-cast formwork pipe 4 along the vertical direction, connecting the upper end of the anchor rod 11 with the anchor bolt fixing plate 2, and suspending the lower end of the anchor rod 11, wherein the connection of the upper end of the anchor rod 11 with the anchor bolt fixing plate 2 mentioned here can mean that the upper end of the anchor rod 11 is directly connected with the anchor bolt fixing plate 2, or indirectly connected with the anchor bolt fixing plate 2: the upper end of the anchor rod 11 is connected with the anchor bolt fixing plate 2 through the necking plate 6, and the two connection modes are protected by the invention, specifically, the necking plate 6 can be connected with the anchor bolt fixing plate 2 through the first threaded fastener 9, and the necking plate 6 is connected with the upper end of the anchor rod 11 through the second threaded fastener 10;
s5, pouring first Concrete 12 outside the embedded die pipe 4, and pouring second Concrete 13 inside the embedded die pipe 4, wherein preferably, common Concrete is used as the first Concrete 12, and Ultra-High Performance Concrete is used as the second Concrete 13, wherein the Ultra-High Performance Concrete is called UHPC (Ultra-High Performance Concrete) for short, also called Reactive Powder Concrete (RPC), and can be poured through corresponding pouring holes 14;
s6, when the first concrete 12 and the second concrete 13 reach the preset strength, the anchor rod 11 is prestressed, wherein the preset strength can be set according to the actual production situation, for example, the preset strength can be set by referring to the following table 1, for example, the design value f of the axial compressive strength of the concrete under the strength grade of C30CCan be 16.7N/mm2 and the core tensile strength design value f of the concretetMay be 1.43N/mm2Of course, this table is only used as a reference example, but not for limiting the present invention, and the skilled person can set the preset intensity according to the actual requirement.
Design value of concrete strength (N/mm)2)
Table 1
As mentioned above, since the construction method of the vertical anchor self-protection fan foundation provided by the present invention includes the above steps, the ultra-high performance concrete can be used as the second concrete 13, and the ultra-high performance concrete has superior durability and fatigue resistance, so that the anchor rod 11, the anchor bolt fixing plate 2 and the foundation ring 1 can work together for a long time, and the condition of stress concentration of the concrete around the flange under the foundation ring 1 is greatly reduced, thereby effectively avoiding the fatigue damage of the concrete around the foundation ring 1.
According to a preferred embodiment of the invention, a (brittle) low-ductility metal material may be used as the necking plate 6. The fracture strength of the necking plate 6 is set to be lower than the limit strength of the anchor 11 fatigue failure, that is, the fracture of the necking plate 6 occurs when the tensile stress value in the anchor 11 exceeds the limit value of the fatigue. Therefore, the anchor rods 11 pre-embedded in the foundation are not subjected to fatigue failure all the time, and the necking plates 6 can be conveniently replaced.
In addition, the construction method of the vertical anchor self-protection type fan foundation can further comprise the following steps: in step S6, a pretension is generated in the anchor rod 11 by pretensioning the anchor fixing plate 2 against the necking plate 6, in particular, the upper end of the anchor rod 11 can be passed through the central hole of the necking plate 6, and then the bolt assembly connecting the necking plate 6 and the anchor fixing plate 2 around the central hole is pretensioned.
In addition, the invention also provides a vertical anchor self-protection type fan foundation which is manufactured by the construction method of the vertical anchor self-protection type fan foundation.
In addition, the invention also provides a vertical anchor self-protection type fan foundation, wherein the vertical anchor self-protection type fan foundation comprises first concrete 12, a foundation ring 1 arranged in the first concrete 12, a metal cage structure 5, an embedded mold pipe 4 and an anchor rod 11 in the embedded mold pipe 4, the embedded mold pipe 4 and the anchor rod 11 are arranged from top to bottom in the vertical direction, an anchor bolt fixing plate 2 is connected to the outer peripheral side of the foundation ring 1, the upper end of the anchor rod 11 is connected with the anchor bolt fixing plate 2, second concrete 13 is arranged in the embedded mold pipe 4, and the middle section and the lower end of the anchor rod 11 are arranged in the second concrete 13. Similarly, referring to the above description of the construction method of the vertical anchor self-protecting wind turbine foundation, the upper end of the anchor rod 11 may be connected to the anchor bolt fixing plate 2 through the necking plate 6. The breakneck strength of the necking plate 6 may be below the threshold strength for fatigue failure of the anchor 11, and the necking plate 6 is preferably a low ductility metal necking plate.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (4)
1. A construction method of a vertical anchor self-protection type fan foundation is characterized by comprising the following steps:
s1, arranging an anchor bolt fixing plate connected with the foundation ring on the outer periphery side of the foundation ring, wherein the foundation ring is provided with a plurality of first mounting holes at positions below the anchor bolt fixing plate, and the first mounting holes are arranged at intervals from top to bottom along the axial direction of the foundation ring;
s2, placing the embedded die pipe on the outer periphery of the foundation ring along the vertical direction, and connecting the foundation ring with the embedded die pipe by using a fastening sleeve penetrating through the first mounting hole;
s3, hoisting the foundation ring, and binding a metal cage structure around the foundation ring;
s4, placing an anchor rod in the embedded die pipe along the vertical direction, connecting the upper end of the anchor rod with the anchor bolt fixing plate, and suspending the lower end of the anchor rod, wherein the upper end of the anchor rod is connected with the anchor bolt fixing plate through a necking plate, the necking plate is connected with the anchor bolt fixing plate through a first threaded fastener, the necking plate is connected with the upper end of the anchor rod through a second threaded fastener, and a low-ductility metal material is used as the necking plate;
s5, pouring first concrete outside the embedded die pipe, pouring second concrete in the embedded die pipe, taking common concrete as the first concrete, and taking ultra-high performance concrete as the second concrete;
and S6, when the first concrete and the second concrete reach the preset strength, enabling the anchor rod to generate pretension.
2. The construction method of the vertical anchor self-protection fan foundation according to claim 1, wherein the construction method of the vertical anchor self-protection fan foundation comprises the following steps: the brittle fracture strength of the necking plate is set to be lower than the limit strength of the bolt fatigue failure.
3. The construction method of the vertical anchor self-protection fan foundation according to claim 1, wherein the construction method of the vertical anchor self-protection fan foundation comprises the following steps: in step S6, a pretension is generated in the anchor rod by pretensioning the anchor bolt fastening plate against the necking plate.
4. A vertical anchor self-protection fan foundation, characterized in that the vertical anchor self-protection fan foundation is manufactured by the construction method of the vertical anchor self-protection fan foundation according to any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910985922.5A CN110735444B (en) | 2019-10-17 | 2019-10-17 | Vertical anchor self-protection type fan foundation and construction method thereof |
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| CN201910985922.5A CN110735444B (en) | 2019-10-17 | 2019-10-17 | Vertical anchor self-protection type fan foundation and construction method thereof |
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| CN110735444B true CN110735444B (en) | 2021-09-10 |
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| CN112268542B (en) * | 2020-10-23 | 2022-11-08 | 湖南砼联科技有限责任公司 | Detection method and measurement device for inclination angle of tower of wind turbine generator |
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2019
- 2019-10-17 CN CN201910985922.5A patent/CN110735444B/en active Active
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| CN104110353A (en) * | 2014-07-03 | 2014-10-22 | 中国电建集团华东勘测设计研究院有限公司 | Anti-overturning wind generator foundation ring structure and construction method thereof |
| CN204456167U (en) * | 2015-02-12 | 2015-07-08 | 四川电力设计咨询有限责任公司 | Prestress anchoraging blower foundation |
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