CN107859050B - Wind driven generator foundation and construction method thereof - Google Patents
Wind driven generator foundation and construction method thereof Download PDFInfo
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- CN107859050B CN107859050B CN201710911392.0A CN201710911392A CN107859050B CN 107859050 B CN107859050 B CN 107859050B CN 201710911392 A CN201710911392 A CN 201710911392A CN 107859050 B CN107859050 B CN 107859050B
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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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Abstract
The invention relates to a wind driven generator foundation and a construction method thereof, wherein the wind driven generator foundation comprises a foundation main body, a foundation main body and a foundation body, wherein the foundation main body comprises a pouring groove; the foundation ring comprises an annular main body and a flange which are connected with each other, the annular main body comprises a first end part, a second end part and a side wall which is connected with the first end part and the second end part, the first end part extends into the foundation main body, the flange is connected with the first end part to form a connecting part, and the connecting part is positioned in the pouring groove; the reinforcing block is arranged in the pouring groove and covers the connecting portion, and the strength of the reinforcing block is greater than that of the foundation main body. The wind driven generator foundation and the construction method thereof provided by the embodiment of the invention can improve the strength of the position of the connecting part formed at the connecting part of the annular main body and the flange, ensure the strength requirement of the wind driven generator during reciprocating motion, and avoid the shaking phenomenon of the tower barrel caused by stress concentration and abrasion, thereby ensuring the normal operation of the wind driven generator.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a wind driven generator foundation and a construction method thereof.
Background
Traditional aerogenerator basis adopts basic ring type aerogenerator basis mostly, and basic ring type aerogenerator basis has basic concrete portion and connects the basic ring of basic concrete portion, and the whole foundation can be through the basic ring realization of its self and be connected with the tower section of thick bamboo, and in actual project, the not hard up phenomenon appears easily in basic ring and basic concrete joint position.
The loosening phenomenon of the combination part of the foundation ring and the foundation concrete is related to the inherent stress characteristic of the connection form between the foundation ring and the foundation concrete. The load transmitted to the bottom of the tower drum by the upper structure of the wind driven generator is mainly bending moment, and the foundation ring is used as a structure for connecting the tower drum and the foundation concrete and transmits the bending moment at the bottom of the tower drum to the foundation concrete. The contribution that the interact of foundation ring rampart and peripheral basic concrete was undertaken to the moment of flexure is limited, therefore the moment of flexure that the wind turbine generator system upper portion was transmitted is mostly near the end flange of foundation ring, promptly: the bottom flange of the foundation ring is the main stressed part for anchoring the foundation ring.
The connection part of the ring wall of the foundation ring and the bottom flange forms an inner right angle and an outer right angle, obvious stress concentration exists at the part when the stress is applied, and the connection part of the ring wall of the foundation ring and the bottom flange corresponding to the foundation is not easy to compact and is easy to form a weak part. The part can be ground along with the reciprocating motion of the wind driven generator, concrete at the connecting part of the annular wall of the foundation ring and the bottom flange of the annular wall is damaged, and a cavity is formed, so that the foundation ring and a tower cylinder connected with the foundation ring obviously shake, the normal operation of the wind driven generator set is influenced, and the generated energy loss is caused.
Disclosure of Invention
The embodiment of the invention provides a wind driven generator foundation and a construction method thereof, which can avoid the shaking of a tower barrel and ensure the normal operation of a wind driven generator.
One aspect of the embodiments of the present invention provides a wind turbine foundation, including: a foundation body including a casting trough; the foundation ring comprises an annular main body and a flange which are connected with each other, the annular main body comprises a first end part, a second end part and a side wall which is connected with the first end part and the second end part, the first end part extends into the foundation main body, the flange is connected with the first end part, a connecting part is formed at the connecting part of the first end part and the flange, and the connecting part is positioned in the pouring groove; the reinforcing block is arranged in the pouring groove and covers the connecting portion, and the strength of the reinforcing block is greater than that of the foundation main body.
according to one aspect of the embodiment of the invention, the reinforcing block is an annular structural body, and comprises a top surface and a bottom surface which are oppositely arranged, the top surface is arranged close to the second end portion, and the bottom surface is arranged far away from the second end portion.
According to one aspect of an embodiment of the present invention, the reinforcing block is a ring-shaped structural body having a uniform cross section.
According to an aspect of the embodiment of the present invention, the shape of the flange is matched with the shape of the cross section of the annular main body, and the distance from the top surface of the reinforcing block to the flange is 0.5 to 1 times the width of the flange in the radial direction, and/or the distance from the bottom surface of the reinforcing block to the flange is 0 to 0.5 times the width of the flange in the radial direction.
according to one aspect of an embodiment of the invention, the material of the reinforcing block comprises polymer concrete or high strength grout.
According to an aspect of the embodiment of the invention, the foundation further comprises a support adjusting component arranged in the foundation main body, wherein the support adjusting component comprises more than two support adjusting units, and the more than two support adjusting units are distributed along the circumferential direction of the foundation ring and connected with the flange to adjust the levelness of the foundation ring.
according to one aspect of the embodiment of the invention, the support adjusting unit comprises a support rod and a leveling screw rod, one end of the leveling screw rod is connected to the support rod, the other end of the leveling screw rod is connected to the flange, and the leveling screw rod is provided with locking nuts which are positioned on two sides of the flange and abut against the flange.
The embodiment of the invention provides a construction method of a wind driven generator foundation on the other hand, which comprises the following steps:
Providing a base ring, wherein the base ring comprises an annular main body and a flange which are connected with each other, the annular main body comprises a first end part, a second end part and a side wall which is opposite to the first end part, the side wall is used for connecting the first end part and the second end part, and the flange is connected with the first end part to form a connecting part;
Placing a foundation ring in a preset pouring space, and enabling a second end part of the foundation ring to protrude out of the pouring space;
adding a first pouring material into the pouring space to form an initial foundation main body, wherein the initial foundation main body is provided with a pouring groove, and the pouring groove is formed by extending along the extending track of the connecting part;
pouring a second pouring material into the pouring groove to form a reinforcing block, wherein the connecting part is coated by the reinforcing block;
Continuously adding a first pouring material to the initial foundation main body and the reinforcing blocks in the pouring space to form a foundation main body for coating the foundation ring and the reinforcing blocks, wherein the strength of the reinforcing blocks is greater than that of the foundation main body; the foundation main body, the foundation ring and the reinforcing block form a wind driven generator foundation together.
according to another aspect of the embodiment of the invention, the step of adding the first casting material into the casting space to form an initial foundation body, wherein the initial foundation body is provided with a casting groove, and the casting groove is formed along the extending track of the connecting part in an extending mode and comprises the following steps of;
pouring a first pouring material into the pouring space, and stopping pouring the first pouring material when the first pouring material and the flange reach a first preset distance to form a bottom foundation main body;
and continuously pouring a first pouring material into the pouring space from the inner side and the outer side of the side wall of the annular main body and the position, which is apart from the flange by a second preset distance, of the inner side and the outer side, and forming an initial foundation main body together with the bottom foundation main body, and forming a pouring groove extending along the extending track of the connecting part on the initial foundation main body by utilizing the slump of the first pouring material.
According to another aspect of the embodiment of the invention, the shape of the flange is matched with the cross-sectional shape of the annular main body, the first preset distance is 0-0.5 times of the width of the flange in the radial direction, and the second preset distance is 0.5-1 times of the width of the flange in the radial direction.
According to another aspect of an embodiment of the invention, the second casting comprises polymer concrete or high strength grouting material.
according to the wind driven generator foundation and the construction method thereof provided by the embodiment of the invention, the wind driven generator foundation comprises a foundation main body, a foundation ring and a reinforcing block, the foundation main body comprises a pouring groove, the foundation ring comprises an annular main body and a flange connected with the annular main body, the first end part of the annular main body and the flange are both positioned in the foundation main body, a connecting part formed by connecting the annular main body and the flange is positioned in the pouring groove, the strength of the reinforcing block is greater than that of the foundation main body, and the reinforcing block is arranged in the pouring groove and covers the connecting part, so that the strength of the connecting part is enhanced, the strength requirement of the wind driven generator during reciprocating motion can be ensured, the phenomenon that a tower barrel connected with the foundation ring shakes due to stress concentration and abrasion is avoided.
drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a longitudinal cut-away view of a wind turbine foundation according to an embodiment of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a schematic structural view of the foundation body shown in FIG. 1;
FIG. 4 is a schematic structural view of the foundation ring shown in FIG. 1;
FIG. 5 is a longitudinal sectional view of a wind turbine foundation according to another embodiment of the present invention;
Fig. 6 is an enlarged view at B in fig. 5.
wherein:
10-a basic body;
101-an initial basic body; 101 a-a bottom base body; 102-pouring a groove;
20-a base ring;
21-a ring-shaped body; 211-a first end portion; 212-a second end; 213-a side wall;
22-a flange; d-width in radial direction; 23-a connecting part;
30-a reinforcing block; 31-a top surface; 32-a bottom surface;
40-a support adjustment unit; 41-support rod; 42-leveling screw; 43-locking nut.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The following description will be given with the directional terms as they are shown in the drawings, and not with the specific structure of the wind turbine foundation of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
for a better understanding of the invention, a wind turbine foundation according to an embodiment of the invention will be described in detail below with reference to fig. 1 to 6.
Referring to fig. 1 to 4 together, fig. 1 shows a longitudinal sectional view of a wind turbine foundation according to an embodiment of the present invention, fig. 2 shows an enlarged view of a point a in fig. 1, fig. 3 shows a schematic structural view of a foundation body 10 in fig. 1, and fig. 4 shows a schematic structural view of a foundation ring 20 in fig. 1. The embodiment of the invention provides a wind driven generator foundation which comprises: the foundation comprises a foundation main body 10, a foundation ring 20 and a reinforcing block 30, wherein the foundation main body 10 comprises a pouring groove 102, the foundation ring 20 comprises an annular main body 21 and a flange 22 which are connected with each other, the annular main body 21 comprises a first end part 211, a second end part 212 and a side wall 213 which is connected with the first end part 211 and the second end part 212, the first end part 211 extends into the foundation main body 10, the flange 22 is connected with the first end part 211, a connecting part 23 is formed at the connecting part of the first end part 211 and the flange 22, and the connecting part 23 is positioned in the pouring groove 102; the reinforcing block 30 is disposed in the casting groove 102 and covers the connecting portion 23, and the strength of the reinforcing block 30 is greater than that of the foundation main body 10.
according to the wind driven generator foundation provided by the embodiment of the invention, the foundation main body 10 comprises the pouring groove 102, the connecting part 23 formed by connecting the annular main body 21 and the flange 22 is positioned in the pouring groove 102, the reinforcing block 30 is arranged in the pouring groove 102 and covers the connecting part 23, and the strength of the reinforcing block 30 is greater than that of the foundation main body 10, so that the strength of the position where the connecting part 23 is positioned is enhanced, the strength requirement of the wind driven generator during reciprocating motion can be ensured, the phenomenon that a tower barrel connected with the foundation ring 20 shakes due to stress concentration and abrasion is avoided, and the normal operation of the wind driven generator is ensured.
specifically, the entire foundation body 10 is of a columnar structure, and the size of the bottom surface is larger than that of the top surface, so that the stability of the entire foundation of the wind driven generator is improved. In this embodiment, the top surface of the foundation main body 10 is circular, and the bottom surface of the foundation main body 10 is also circular, so as to facilitate supporting and pouring. The foundation main body 10 is formed by casting concrete, and when casting, the initial foundation main body 101 is cast in advance, and the casting groove 102 is formed on the initial foundation main body 101 to reserve the placement space for the connecting portion 23 and the reinforcing block 30, and the casting groove 102 is arranged around the axis of the foundation main body 10.
the annular main body 21 of the foundation ring 20 extends along the axial direction of the foundation main body 10 and is coaxial with the foundation main body 10, the shape of the flange 22 matches with the shape of the annular main body 21, that is, the flange 22 is also a continuous annular structure, the flange 22 is coaxial with the annular main body 21 and is horizontally arranged in the foundation main body 10, the first end portion 211 of the annular main body 21 is connected to the center of the upper surface of the flange 22, so that the cross section of the connecting portion 23 formed by the first end portion 211 of the annular main body 21 and the upper surface of the flange 22 is in the form of an inner right angle and an outer right angle, and the connecting portion 23 is located in.
the reinforcing block 30 is an annular structure, the shape of the reinforcing block 30 is matched with that of the pouring groove 102, the reinforcing block 30 is arranged in the pouring groove 102 and fixedly connected with the groove wall of the pouring groove 102, the reinforcing block 30 comprises a top surface 31 and a bottom surface 32 which are oppositely arranged, the top surface 31 is arranged towards the second end part 212 close to the annular main body 21, and the bottom surface 32 is arranged towards the second end part 212 far away from the annular main body 21. The material of the reinforcing block 30 includes polymer concrete, and preferably, the entire reinforcing block 30 is cast from polymer concrete, and the connecting portion 23 is covered by the reinforcing block 30.
The polymer concrete is prepared by mixing a polymer serving as a cementing material with aggregate, pouring, curing and polymerizing. Compared with common concrete, the polymer cementing material of the polymer concrete has high strength, and the cementing material has strong adhesion with aggregate, so that the damage of the polymer concrete is usually not caused between the aggregate and the filler like the common concrete, but the aggregate is firstly damaged, so that the compressive strength, the bending strength and the tensile strength of the polymer concrete are high, and the polymer concrete has good wear resistance and fatigue resistance.
The connecting part 23 formed at the joint of the first end part 211 and the flange 22 is coated by the reinforcing block 30, so that the advantages of high strength, fatigue resistance and wear resistance of polymer concrete can be fully utilized, the performance of the position of the connecting part 23 is enhanced, the strength requirement of the wind driven generator during reciprocating motion can be ensured, the phenomenon of shaking of the wind guide power generator tower barrel due to stress concentration and wear is avoided, and the normal operation of the wind driven generator is ensured.
Meanwhile, in the polymer concrete, polymer components used as cementing materials finally participate in the curing reaction, so that the polymer concrete has no communicated capillary pores, so that the polymer concrete has much higher permeation resistance than common concrete, and has excellent durability. In addition, the polymer can form a film with higher adhesive force in the curing process, the film can firmly bond the filler and the polymer together, and the polymer concrete has good adhesion with cement concrete or mortar, stone, metal, wood and the like, so that the reinforcing block 30 can be well connected with the foundation main body 10 and the foundation ring 20 in a pouring manner, and the strength of the foundation of the wind driven generator is ensured.
Since the concrete stress concentration area near the flange 22 of the foundation ring 20 is distributed only in a certain range near the connecting portion 23, the stress level in the range is often over the compressive strength of the common concrete, and then the stress of the concrete is rapidly reduced by expanding towards the periphery. Therefore, as an alternative embodiment, the distance from the top surface 31 of the reinforcing block 30 to the flange 22 is 0.5 times the width d of the flange 22 in the radial direction, the distance from the bottom surface 32 of the reinforcing block 30 to the flange 22 is 0 times the width d of the flange 22 in the radial direction, and the flange 22 has a certain thickness in the axial direction, so the distance to the flange 22 in this embodiment is referred to with the lower surface of the flange 22 as a reference point, that is, the distance from the top surface 31 of the reinforcing block 30 to the flange 22 and the distance from the bottom surface 32 of the reinforcing block 30 to the flange 22 in this embodiment both refer to the distance to the lower surface of the flange 22. Meanwhile, the flange 22 is a continuous annular structure, and the width d in the radial direction of the flange 22 refers to the difference between the radius of the outer ring of the flange 22 and the radius of the inner ring itself.
that is, in this embodiment, the flange 22 is wrapped in the reinforcing block 30 except the lower surface thereof, and the reinforcing block 30 is limited to the above form, so that the strength requirement of the wind turbine foundation can be ensured, the phenomenon of shaking of the tower due to stress concentration and abrasion can be avoided, meanwhile, the structure of the reinforcing block 30 can be optimized, and the overall cost of the wind turbine foundation can be reduced.
Because the wind generating set has the verticality requirement on the tower, and the levelness of the flange of the foundation ring 20 connected with the tower needs to be limited within the range of 1-3 mm, the levelness of the foundation ring 20 is required to be adjusted before the wind generating set foundation is formed. Therefore, as an optional implementation manner, the wind turbine foundation further includes a supporting adjustment component disposed in the foundation main body 10, the supporting adjustment component includes more than two supporting adjustment units 40, the more than two supporting adjustment units 40 are distributed along the circumferential direction of the foundation ring 20 and are connected with the flange 22 to adjust the levelness of the foundation ring 20, each supporting adjustment unit 40 includes a supporting rod 41 and a leveling screw 42, the leveling screw 42 is located above the supporting rod 41, and one end of the leveling screw 42 is fixedly connected with the supporting rod 41, the other end of the leveling screw 42 is inserted into the flange 22 to be connected with the flange 22, and a locking nut 43 is correspondingly disposed on the leveling screw 42, in this embodiment, the locking nut 43 includes two locking nuts and is located on two sides of the flange 22, and the two locking nuts 43 respectively abut against the flange 22, and specifically abut against the upper surface and the lower surface. The leveling work of the foundation ring 20 can be completed by adjusting the position of the flange 22 on the leveling screw 42 of each supporting unit and locking through the locking nut 43, and the levelness of the foundation ring 20 is ensured.
Therefore, when the wind driven generator foundation provided by the embodiment of the invention is used, the bottom of the tower of the wind driven generator can be fixedly connected with the top of the foundation ring 20, and particularly can be connected in a flange connection mode, because the connecting part 23 formed at the connecting part of the annular main body 21 and the flange 22 is coated with the reinforcing block 30, and the reinforcing block 30 is formed by pouring polymer concrete, the concrete has better strength, wear resistance and fatigue resistance compared with common concrete, the performance of the position where the connecting part 23 is located is enhanced, the strength requirement of the wind driven generator during reciprocating motion can be ensured, the tower shaking phenomenon caused by stress concentration and abrasion can be avoided, and the normal operation of the wind driven generator can be ensured.
It is understood that the shape of the top and bottom surfaces of the base body 10 is not limited to the circular shape, and in some alternative embodiments, the top surface of the base body 10 may be circular, the bottom surface of the base body 10 may be square, or both the top and bottom surfaces of the base body 10 may be square or polygonal, etc. The reinforcing block 30 is not limited to include polymer concrete, in some alternative embodiments, the reinforcing block 30 may further include high-strength grouting material, and the reinforcing block 30 may be integrally formed by pouring the high-strength grouting material, of course, the reinforcing block 30 may also be partially formed by pouring the polymer concrete, and partially formed by pouring the high-strength grouting material, which may be set according to the use requirement.
In the present embodiment, the reinforcing block 30 is defined as a ring structure and has a variable cross-section from bottom to top, but is not limited thereto. In some optional embodiments, the reinforcing block 30 may also be an annular structure with a uniform cross section, and when the reinforcing block 30 adopts the annular structure with a uniform cross section, the strength requirement of the foundation of the wind turbine can be better ensured, so that the stress is more uniform, and stress concentration is avoided, so as to ensure the normal operation of the wind turbine.
it is understood that the distance from the bottom surface 32 of the reinforcing block 30 to the flange 22 is not limited to 0 times the width d of the flange 22 in the radial direction, and the concrete of the foundation body 10 near the lower surface of the flange 22 is also stressed greatly, so please refer to fig. 5 and 6 together, fig. 5 shows a longitudinal section view of a wind turbine foundation according to another embodiment of the present invention, and fig. 6 shows an enlarged view at B in fig. 5. In an alternative embodiment, the distance from the bottom surface 32 of the reinforcing block 30 to the flange 22 may be 0.5 times of the radial width d of the flange 22, and of course, the distance from the bottom surface 32 of the reinforcing block 30 to the flange 22 may also be any value between 0 and 0.5 times of the radial width d of the flange 22, as long as the foundation body 10 near the lower surface of the flange 22 can be reinforced to ensure the strength thereof, and further ensure the strength requirement of the foundation of the wind turbine.
moreover, the distance from the top surface 31 of the reinforcing block 30 to the flange 22 is not limited to 0.5 times of the radial width d of the flange 22, in some alternative embodiments, the distance from the top surface 31 of the reinforcing block 30 to the flange 22 may also be 1 time of the radial width d of the flange 22, and of course, the distance may also be any value between 0.5 and 1 times of the radial width d of the flange 22, as long as the shaking phenomenon of the tower caused by stress concentration and abrasion can be avoided, the structure of the reinforcing block 30 is optimized, and the overall cost of the foundation of the wind turbine is reduced.
Meanwhile, the number of the locking nuts 43 of each supporting and adjusting unit 40 is not limited to two, and in some alternative embodiments, the number of the locking nuts 43 of each supporting and adjusting unit 40 may also be more than two, for example, four, the four locking nuts 43 may be symmetrically distributed on two sides of the flange 22 and abut against the flange 22, and the number of the locking nuts 43 may be set according to specific situations as long as the requirement of adjusting the levelness of the foundation ring 20 can be met.
The embodiment of the invention also provides a construction method of the wind driven generator foundation, which can be used for the construction of the wind driven generator foundation shown in the figures 1 to 4 and comprises the following steps:
Providing a base ring 20, wherein the base ring 20 comprises an annular main body 21 and a flange 22 which are connected with each other, the annular main body 21 comprises a first end portion 211, a second end portion 212 and a side wall 213 which connects the first end portion 211 and the second end portion 212, and the flange 22 is connected with the first end portion 211 to form a connecting portion 23;
placing the foundation ring 20 into a predetermined casting space, and projecting the second end 212 of the foundation ring 20 out of the casting space;
adding a first casting material into the casting space to form an initial foundation body 101, wherein the initial foundation body 101 is provided with a casting groove 102, and the casting groove 102 is formed by extending along the extending track of the connecting part 23;
Pouring a second pouring material into the pouring groove 102 to form a reinforcing block 30, wherein the connecting part 23 is covered by the reinforcing block 30;
And continuously adding the first pouring material to the initial foundation main body 101 and the reinforcing blocks 30 in the pouring space to form the foundation main body 10 covering the foundation ring 20 and the reinforcing blocks 30, wherein the strength of the reinforcing blocks 30 is greater than that of the foundation main body 10, and the foundation main body 10, the foundation ring 20 and the reinforcing blocks 30 form the foundation of the wind driven generator together.
Specifically, the first casting material is common concrete, such as concrete with strength grade C35 or C40, the second casting material includes polymer concrete, the flange 22 is a continuous annular structure, the flange 22 is coaxial with the annular main body 21 and can be horizontally arranged in the casting space through a supporting and adjusting component, the first end 211 of the annular main body 21 is connected to the center of the upper surface of the flange 22, and the section of the connecting part 23 formed by the first end 211 of the annular main body 21 and the upper surface of the flange 22 is in the form of inner and outer right angles. In this embodiment, a first casting material is added into the casting space to form an initial foundation body 101, the initial foundation body 101 has a casting groove 102, and the step of forming the casting groove 102 along the extending track of the connecting portion 23 includes: pouring a first pouring material into the pouring space, and stopping pouring the first pouring material when the first pouring material and the flange 22 reach a first preset distance, so as to form a bottom foundation main body 101a, wherein the first preset distance is 0 time of the radial width d of the flange 22, that is, when the first pouring material reaches the lower surface of the flange 22, stopping pouring the first pouring material, and then continuously pouring the first pouring material into the pouring space from the outer side and the inner side of the side wall 213 of the annular main body 21 and the position apart from the flange 22 by a second preset distance, so as to form the initial foundation main body 101 together with the bottom foundation main body 101 a. In this embodiment, the step of continuously pouring the first pouring material into the pouring space from the inner side and the outer side of the sidewall 213 of the annular main body 21 and the distance from the flange 22 to the second preset distance means that: the first casting material is continuously cast into the casting space from the inner side and the outer side of the sidewall 213 of the annular main body 21, a second preset distance from the inner annular surface of the flange 22 and a second preset distance from the outer annular surface of the flange 22. The second preset distance is 0.5 times of the radial width of the flange 22, the radial width of the flange 22 refers to the difference between the radius of the outer ring of the flange 22 and the radius of the inner ring of the flange 22, the pouring groove 102 extending along the extending track of the connecting part 23 is formed on the initial foundation main body 101 by utilizing the slump of the first pouring material, no additional supporting mold is needed, the influence on the foundation construction is small, and the construction is convenient.
Of course, the casting groove 102 may be formed on the primary foundation body 101 along the extending track of the connecting portion 23 in the form of a supporting mold to define the shape of the casting groove 102 according to the use requirement. When the casting groove 102 extending along the extending track of the connecting portion 23 is formed on the initial foundation body 101 in the form of a supporting mold, the supporting mold of the connecting portion 23 is enclosed on the bottom foundation body 101a formed by the first casting material, and the first casting material is continuously cast into the casting space together with the bottom foundation body 101a to form the initial foundation body 101. In this case, the second casting material is not limited to polymer concrete, and in some alternative embodiments, the second casting material may include high-strength grouting material, and the flow of the high-strength grouting material may be limited by the supporting mold to form the reinforcing block 30 in the casting groove 102.
It is understood that the first predetermined distance is not limited to 0 times the width d of the flange 22 in the radial direction, and in some alternative embodiments, the first predetermined distance may be 0.5 times the radial width of the flange 22, and may be used for constructing a wind turbine foundation as shown in fig. 5 and 6, and of course, the first predetermined distance may also be any value between 0 and 0.5 times the radial width of the flange 22, so that the lower surface of the flange 22 is covered in the reinforcing block 30 formed by pouring the second pouring material.
meanwhile, the second preset distance is not limited to 0.5 time of the radial width of the flange 22, in some optional embodiments, may also be 1 time of the radial width of the flange 22, or any number of times between 0.5 and 1 time of the radial width of the flange 22, as long as the casting groove 102 is formed on the initial foundation main body 101 by using the slump of the first casting material, so that the reinforcing block 30 cast in the casting groove 102 covers the connecting part 23, the strength requirement of the wind driven generator during reciprocating motion is ensured, and the phenomenon of shaking caused by stress concentration and abrasion is avoided, thereby ensuring the normal operation of the wind driven generator.
Therefore, the construction method of the wind driven generator foundation provided by the embodiment of the invention is convenient to operate, the pouring groove 102 can be formed on the initial foundation main body 101 forming the foundation main body 10, the reinforcing block 30 is formed in the pouring groove 102 and used for coating the connecting part 23 formed by connecting the annular main body 21 and the flange 22, so that the strength of the position of the connecting part 23 is enhanced, the strength requirement of the wind driven generator during reciprocating motion can be ensured, the phenomenon that the tower barrel connected with the foundation ring 20 shakes due to stress concentration and abrasion is avoided, the normal operation of the wind driven generator is ensured, the first pouring material can be formed by means of collapse of the pouring groove 102, a supporting mold is not needed additionally, the influence on the foundation construction is small, and the construction is more convenient.
while the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (11)
1. a wind turbine foundation, comprising:
a foundation body (10) comprising a casting trough (102);
The foundation ring (20) comprises an annular main body (21) and a flange (22) which are connected with each other, the annular main body (21) comprises a first end part (211), a second end part (212) and a side wall (213) which connects the first end part (211) with the second end part (212), the first end part (211) extends into the foundation main body (10) and is arranged, the flange (22) is connected with the first end part (211), a connecting part (23) is formed at the connecting part of the first end part (211) and the flange (22), and the connecting part (23) is positioned in the pouring groove (102);
and a reinforcing block (30) which is arranged in the pouring groove (102) and covers the connecting part (23), wherein the strength of the reinforcing block (30) is greater than that of the foundation main body (10).
2. Wind turbine foundation according to claim 1, wherein the reinforcement block (30) is a ring-shaped structure comprising a top surface (31) and a bottom surface (32) arranged opposite each other, the top surface (31) being arranged close to the second end (212) and the bottom surface (32) being arranged remote from the second end (212).
3. Wind turbine foundation according to claim 2, characterized in that said reinforcing blocks (30) are annular structures of constant section.
4. wind turbine foundation according to claim 2, wherein the shape of the flange (22) matches the cross-sectional shape of the ring-shaped body (21), the distance from the top surface (31) of the reinforcing block (30) to the lower surface of the flange (22) being 0.5-1 times the width of the flange (22) in the radial direction, and/or the distance from the bottom surface (32) of the reinforcing block (30) to the lower surface of the flange (22) being 0-0.5 times the width of the flange (22) in the radial direction, the width of the flange in the radial direction being the difference between the outer ring radius of the flange (22) and its own inner ring radius.
5. wind turbine foundation according to any of claims 1 to 4, wherein the material of the reinforcement blocks (30) comprises polymer concrete or high strength grout.
6. Wind turbine foundation according to any one of claims 1 to 4, further comprising a support adjustment member arranged in the foundation body (10), the support adjustment member comprising two or more support adjustment units (40), the two or more support adjustment units (40) being distributed along the circumference of the foundation ring (20) and being connected to the flange (22) for adjusting the levelness of the foundation ring (20).
7. Wind turbine foundation according to claim 6, wherein said support adjustment unit (40) comprises a support rod (41) and a leveling screw (42), one end of said leveling screw (42) is connected to said support rod (41), the other end is connected to said flange (22), a locking nut (43) is arranged on said leveling screw (42), said locking nut (43) is located on both sides of said flange (22) and abuts against said flange (22).
8. A construction method of a wind driven generator foundation is characterized by comprising the following steps:
Providing a base ring (20) comprising an annular body (21) and a flange (22) connected to each other, the annular body (21) comprising a first end (211), a second end (212) and a sidewall (213) connecting the first end (211) and the second end (212) opposite each other, the flange (22) being connected to the first end (211) to form a connecting portion (23);
Placing the foundation ring (20) to a preset pouring space, and enabling a second end (212) of the foundation ring (20) to protrude out of the pouring space;
Adding a first casting material into the casting space to form an initial foundation body (101), wherein the initial foundation body (101) is provided with a casting groove (102), and the casting groove (102) is formed by extending along the extending track of the connecting part (23);
pouring a second pouring material into the pouring groove (102) to form a reinforcing block (30), wherein the reinforcing block (30) covers the connecting part (23);
Continuing to add the first castable material to the initial foundation body (101) and the reinforcement block (30) within the casting space to form a foundation body (10) encasing the foundation ring (20) and the reinforcement block (30), the reinforcement block (30) having a strength greater than a strength of the foundation body (10);
The foundation body (10), the foundation ring (20) and the reinforcing block (30) together form a wind turbine foundation.
9. The method for constructing a wind turbine foundation according to claim 8, wherein a first casting material is added into the casting space to form an initial foundation body (101), the initial foundation body (101) is provided with a casting groove (102), and the step of forming the casting groove (102) along the extension track of the connecting part (23) comprises the following steps:
pouring the first pouring material into the pouring space, and stopping pouring the first pouring material when the first pouring material reaches a first preset distance from the lower surface of the flange (22) to form a bottom foundation main body (101 a);
And continuously pouring the first pouring material into the pouring space from the inner side and the outer side of the side wall (213) of the annular main body (21), a second preset distance away from the inner ring surface of the flange (22) and a position away from the outer ring surface of the flange by the second preset distance, wherein the first pouring material and the bottom foundation main body (101a) jointly form the initial foundation main body (101), and the pouring groove (102) extending along the extending track of the connecting part (23) is formed on the initial foundation main body (101) by using the slump of the first pouring material.
10. The method for constructing a foundation of a wind turbine generator according to claim 9, wherein the shape of the flange (22) matches the cross-sectional shape of the annular body (21), the first predetermined distance is 0 to 0.5 times the width of the flange (22) in the radial direction, the second predetermined distance is 0.5 to 1 times the width of the flange (22) in the radial direction, and the width of the flange in the radial direction is the difference between the outer ring radius of the flange (22) and the inner ring radius thereof.
11. The method of constructing a wind turbine foundation of claim 8, wherein the second casting comprises polymer concrete or high strength grout.
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| CN201874761U (en) * | 2010-06-01 | 2011-06-22 | 南车株洲电力机车研究所有限公司 | Levelling device for foundation ring of wind generating set |
| CN106759435A (en) * | 2016-12-11 | 2017-05-31 | 广西大学 | A kind of steel structure base ring of mountain region wind driven generator base |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9783950B2 (en) * | 2014-10-07 | 2017-10-10 | Allan P. Henderson | Retrofit reinforcing structure addition and method for wind turbine concrete gravity spread foundations and the like |
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|---|---|---|---|---|
| CN201874761U (en) * | 2010-06-01 | 2011-06-22 | 南车株洲电力机车研究所有限公司 | Levelling device for foundation ring of wind generating set |
| CN106759435A (en) * | 2016-12-11 | 2017-05-31 | 广西大学 | A kind of steel structure base ring of mountain region wind driven generator base |
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