Measurement method of the foundation center of a hybrid tower fan

Abstract

The present application relates to the technical field of wind power tower repairing, and provides a kind of measurement method of mixed tower wind turbine foundation center, comprising the following steps: a plurality of pre-stressed steel strand buried pipes in mixed tower wind turbine foundation are grouped and connected to form a plurality of first measurement straight lines;A plurality of first measurement straight lines are grouped, and two first measurement straight lines in the same group intersect to form a first measurement point;The second measurement point of the bottom surface of the mixed tower wind turbine foundation is determined according to the first measurement point;The center of the mixed tower wind turbine foundation is determined according to the second measurement point.This further quickly completes the installation and positioning of the mixed tower ring piece when reinstalling the tower ring piece, so that the site has the conditions for mixed tower installation construction, and the center line of the new tower structure is coincided with the wind turbine foundation center, so that the center of the old foundation is positioned preferentially.

Description

Technical Field

[0001] This invention relates to the field of wind turbine tower repair technology, specifically to a method for measuring the center of a mixed-tower wind turbine foundation. Background Technology

[0002] In recent years, frequent collapses of wind turbine towers or serious quality problems with concrete segments have severely impacted their safe operation, leading to a series of wind farm tower demolition and reconstruction projects. In these reconstruction projects, wind turbine foundations are large-volume concrete structures with extensive internal steel reinforcement. Forced demolition would inevitably consume significant manpower, material resources, and financial resources, and foundation excavation and blasting would also have a severe impact on the local natural environment. Therefore, the foundations are generally repaired, reinforced, and then reused.

[0003] When reinstalling the tower ring, in order to ensure that the center line of the new tower structure coincides with the center of the wind turbine foundation, it is necessary to prioritize locating the center of the existing foundation. Otherwise, it may lead to tower center offset, flatness not meeting design requirements, or uneven foundation settlement, which poses a great safety risk to the later operation of the hybrid tower. Summary of the Invention

[0004] In view of this, the present invention provides a method for measuring the center of a hybrid tower wind turbine foundation, in order to ensure that the center line of the new tower structure coincides with the center of the wind turbine foundation when reinstalling the tower ring, it is necessary to prioritize locating the center of the existing foundation. Otherwise, it may lead to tower center offset, flatness not meeting design requirements, or uneven foundation settlement, which brings great safety risks to the later operation of the hybrid tower.

[0005] In a first aspect, the present invention provides a method for measuring the center of a hybrid tower wind turbine foundation, comprising the following steps: grouping and connecting several prestressed steel strand buried pipes in the hybrid tower wind turbine foundation to form several first measuring lines; grouping the several first measuring lines into groups, with two first measuring lines in the same group intersecting to form a first measuring point; determining a second measuring point on the bottom surface of the hybrid tower wind turbine foundation based on the first measuring point; and determining the center of the hybrid tower wind turbine foundation based on the second measuring point.

[0006] Beneficial effects: When reinstalling the tower ring, the installation and positioning of the mixed tower ring can be completed more quickly, making the site ready for mixed tower installation. This ensures that the center line of the new tower structure coincides with the center of the wind turbine foundation. It is necessary to prioritize the positioning of the center of the existing foundation to prevent problems such as tower center offset, flatness not meeting design requirements, or uneven foundation settlement, which could bring great safety risks to the later operation of the mixed tower.

[0007] In one optional implementation, the step of "grouping and connecting several prestressed steel strand buried pipes in the hybrid tower wind turbine foundation to form several first measuring straight lines" specifically includes the following steps:

[0008] Based on the hybrid tower fan, select 4n prestressed steel strand buried pipes and determine the center point of the 4n buried pipes; select the two prestressed steel strand buried pipes with the farthest relative center distance as a group, and connect the center points of each group of prestressed steel strand buried pipes to form 2n first measurement straight lines.

[0009] Where n is a positive integer.

[0010] In one optional implementation, the step "selecting the two prestressed steel strand buried pipes with the greatest relative center distance as a group, and connecting the center points of each group of prestressed steel strand buried pipes to form 2n first measurement straight lines" specifically includes:

[0011] Select any one prestressed steel strand buried pipe as the a-th pipe, and set the 2n-1 prestressed steel strand buried pipes spaced 2n-1 times in a clockwise or counterclockwise direction as the 2n+a-th pipe. Set the a-th prestressed steel strand buried pipe and the 2n+a-th prestressed steel strand buried pipe as a group, and connect their center points to form the first measurement straight line of the a-th pipe.

[0012] Repeat the above steps until 2n different first measurement lines are obtained;

[0013] Where a is a positive integer.

[0014] In one optional implementation, the step of "grouping several first measurement lines into groups, with two first measurement lines in the same group intersecting to form a first measurement point" specifically includes the following steps:

[0015] Choose any one of the first measuring lines as the b-th line, and set the first measuring lines that are n-1 times apart in a clockwise or counterclockwise direction as the n+b-th line. The b-th first measuring line and the n+b-th first measuring line are a group and the ropes are pulled separately. The intersection of the two ropes is the b-th first measuring point.

[0016] Repeat the above steps until n different first measurement points are obtained;

[0017] Where b is a positive integer.

[0018] In one optional implementation, the step of "determining the second measurement point on the bottom surface of the hybrid tower fan foundation based on the first measurement point" specifically includes:

[0019] Place the transparent target at the intersection of any set of the first measurement lines and the corresponding ropes, with the center of the transparent target aligned with the first measurement point corresponding to the first measurement line in that set; place a laser plumb bob inside the cavity of the hybrid tower wind turbine foundation corresponding to the first measurement point; align the upper laser of the laser plumb bob vertically upward with the first measurement point; rotate the plumb bob 180 degrees so that the upper laser becomes the lower laser, and the intersection of the laser with the ground at this time is the second measurement point;

[0020] Repeat the above steps until n second measurement points are obtained corresponding to n first measurement points.

[0021] In one alternative implementation, n second measurement points are sequentially connected on the ground to form a first pattern.

[0022] In one optional implementation, the step "determining the center of the hybrid tower fan foundation based on the second measurement point" specifically includes the following steps:

[0023] Find the center of the first shape and mark it as the first center point; use the lower laser of the laser plumb line to align vertically downwards with the first center point; rotate the plumb line 180 degrees to change the lower laser to the upper laser; tighten two mutually perpendicular thin ropes at the elevation of the top surface of the foundation; place the center of the transparent target at the intersection of the two thin ropes, and adjust the position of the center of the transparent target to coincide with the laser beam. At this time, the position of the center of the transparent target is the second center point.

[0024] Beneficial effects: The measurement method uses conventional measuring tools and instruments, such as thin ropes, transparent targets and laser plumb lines, eliminating the need for complex and high-end instruments and equipment, thus reducing testing costs.

[0025] In one alternative implementation, the first graphic is a point, line, or polygon.

[0026] In one alternative implementation, the following steps are also included:

[0027] Determine the centerline of the hybrid tower fan foundation: connect the first center point and the second center point.

[0028] In one alternative implementation, the following steps are also included:

[0029] Determine the installation positioning of the hybrid tower ring: On the horizontal plane where the top surface of the wind turbine foundation is located, take the second center point as the center and draw circles with the outer diameter and inner diameter of the bottom of the tower as the diameters respectively. These circles are the outer and inner contour lines of the hybrid tower bottom ring. The ring formed by the inner and outer contour lines is the installation positioning area of ​​the hybrid tower ring.

[0030] Beneficial effects: Simple and quick operation, saving time and effort. Suitable for locating the center of a mixed tower foundation in wind farm tower demolition and reconstruction projects, and also suitable for re-measuring the center location of wind turbine foundations in new wind farm projects. Applicable to situations where prestressed steel strand buried pipes are evenly distributed around the piers on a mixed tower foundation, and also applicable to situations where prestressed steel strand buried pipes are not evenly distributed around the piers on a mixed tower foundation. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a flowchart of the method for measuring the center of the foundation of a hybrid tower fan in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the planar layout of the prestressed steel strand buried pipe in the wind turbine foundation according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the layout of the first measuring line in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure in which the laser plumb bob and the transparent target are placed inside the cavity of the hybrid tower fan foundation during the implementation of an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the transparent target according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram showing the positioning of the hybrid tower fan foundation and the hybrid tower connection area according to an embodiment of the present invention;

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Hybrid tower fan foundation; 11. Hybrid tower fan foundation cavity;

[0040] 2. Prestressed steel strand buried pipe; 21. First measuring straight line;

[0041] 3. Transparent target;

[0042] 4. Laser plumb line;

[0043] 5. First center point;

[0044] 6. Second center point. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In recent years, frequent collapses of wind turbine towers or serious quality problems with concrete segments have severely impacted their safe operation, leading to a series of wind farm tower demolition and reconstruction projects. In these reconstruction projects, wind turbine foundations are large-volume concrete structures with extensive internal steel reinforcement. Forced demolition would inevitably consume significant manpower, material resources, and financial resources, and foundation excavation and blasting would also have a severe impact on the local natural environment. Therefore, the foundations are generally repaired, reinforced, and then reused.

[0047] When reinstalling the tower ring, in order to ensure that the center line of the new tower structure coincides with the center of the wind turbine foundation, it is necessary to prioritize locating the center of the existing foundation. Otherwise, it may lead to tower center offset, flatness not meeting design requirements, or uneven foundation settlement, which poses a great safety risk to the later operation of the hybrid tower.

[0048] To address the aforementioned technical problems, this invention provides a method for measuring the center of a hybrid tower wind turbine foundation.

[0049] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0050] According to an embodiment of the present invention, in one aspect, a method for measuring the center of a hybrid tower wind turbine foundation 1 is provided, such as... Figure 1 As shown, the specific steps include:

[0051] S1. Connect several prestressed steel strand buried pipes 2 in the foundation 1 of the mixed-tower wind turbine to form several first measurement straight lines 21. For example... Figure 2 As shown, multiple prestressed steel strand buried pipes 2 are symmetrically arranged circumferentially on the foundation 1 of the hybrid wind turbine. 4n prestressed steel strand buried pipes 2 are selected along the circumferential direction, where n is a positive integer. In the figure, the 4n prestressed steel strand buried pipes 2 are distributed counterclockwise around the circumference. The circumferential arrangement of the prestressed steel strand buried pipes 2 can be uniform or non-uniform. When selecting the prestressed steel strand buried pipes 2, it is necessary to ensure that one prestressed steel strand buried pipe 2 can be found symmetrically about the centerline of the hybrid wind turbine foundation 1. For example: Figure 2 As shown, the first prestressed steel strand buried pipe C1 and the corresponding (2n+1)th prestressed steel strand buried pipe C 2n+1Regarding the centerline symmetry of the foundation of the hybrid tower fan; the second prestressed steel strand buried pipe C2 is symmetrical with the opposite (2n+2)th prestressed steel strand buried pipe C 2n+2 The center line of the foundation of the hybrid tower wind turbine is symmetrical.

[0052] The center points of the 4n prestressed steel strand buried pipes 2 are determined using simple mathematical and geometric principles. The two prestressed steel strand buried pipes with the greatest relative center distance are selected as a group. The center points of this group are connected to form 2n first measurement straight lines 21. That is, two prestressed steel strand buried pipes 2 that are symmetrical about the center line of the hybrid tower wind turbine foundation 1 are grouped together. Any prestressed steel strand buried pipe is selected as the *a*th pipe. Prestressed steel strand buried pipes spaced 2n-1 times clockwise or counterclockwise are designated as the *2n+a*th pipes. The *a*th and *2n+a*th prestressed steel strand buried pipes are grouped together, and their center points are connected to form the *a*th first measurement straight line 21. The above steps are repeated until 2n different first measurement straight lines 21 are obtained. Here, *a* is a positive integer. For example: the first prestressed steel strand buried pipe C1 and the *2n+1*th prestressed steel strand buried pipe C... 2n+1 Group 1; the second prestressed steel strand buried pipe C2 and the (2n+2)th prestressed steel strand buried pipe C 2n+2 For group 2, ..., the nth prestressed steel strand buried pipe C n With the 3nth prestressed steel strand buried pipe C 3n For the nth group, the (n+1)th prestressed steel strand buried pipe C n+1 With the 3n+1th prestressed steel strand buried pipe C 3n+1 For the (n+1)th group, ..., the 2nth prestressed steel strand buried pipe C 2n With the 4n prestressed steel strand buried pipe C 4n The root is the 2nth group, which can form a total of 2n first measurement straight lines 21. Theoretically, all 2n first measurement straight lines 21 intersect at the center of the hybrid tower wind turbine foundation 1.

[0053] It should be noted that although the buried pipes of the a-th prestressed steel strand and the 2n+a-th prestressed steel strand are theoretically symmetrical about the center of the hybrid wind turbine foundation 1, due to the long-term use of the hybrid wind turbine foundation 1, the installation error of the buried pipes of the prestressed steel strand 2, and the pouring error of the hybrid wind turbine foundation 1, the line connecting the center of the buried pipe of the a-th prestressed steel strand and the center of the 2n+a-th prestressed steel strand may not pass through the center of the hybrid wind turbine foundation 1.

[0054] S2. Group several first measurement lines 21 into groups, and the intersection of two first measurement lines 21 in the same group forms a first measurement point. For example... Figure 3As shown, the specific steps are as follows: Select any first measuring line 21 as the b-th line, and designate the (n-1)-th first measuring lines 21 spaced clockwise or counterclockwise as the (n+b)-th lines. The b-th and (n+b)-th first measuring lines 21 are grouped together and pulled on separately. The intersection of the two lines is the b-th first measuring point. Repeat the above steps until n different first measuring points are obtained; where b is a positive integer. For example: Figure 3 As shown, the first measurement line D1 and the (n+1)th measurement line D n+1 For group 1; the second first measurement line D2 and the (n+2)th first measurement line D n+2 Group 1; ..., the nth first measurement line D n and the 2nth first measured straight line D 2n For group n, two thin ropes are used to tighten and align with the two first measuring lines 21 in each group. The intersection of the two ropes forms the first measuring point. The first measuring points from group 1 to group n are O. 11 / O 12 / …… / O 1n .

[0055] S3. Determine the second measurement point on the bottom surface of the cavity of the hybrid tower fan foundation 1 based on the first measurement point. For example... Figures 3-5 As shown, place the transparent target 3 at the intersection of any set of first measuring lines 21 and the corresponding ropes, with the center of the transparent target 3 aligned with the first measuring point corresponding to the set of first measuring lines 21; place the laser plumb bob 4 in the cavity 11 of the hybrid tower wind turbine foundation corresponding to the first measuring point; align the upper laser of the laser plumb bob 4 vertically upwards with the first measuring point; then rotate the plumb bob 180 degrees so that the upper laser becomes the lower laser, and the intersection of the laser with the ground is the second measuring point; repeat the above steps until n second measuring points corresponding to n first measuring points are obtained.

[0056] For example, first place the transparent target 3 at the intersection of the thin ropes, with the center of the transparent target 3 aligned with O. 11 Then, a laser plumb bob 4 is erected near the center of the bottom circle inside the cavity 11 of the hybrid tower wind turbine foundation. A tripod is placed above the center of the circle, and the height of the tripod is adjusted to a reasonable height. Through the projection hole in the center of the tripod, the location of the O-axis is roughly found. 11 The intersection of the plumb line and the bottom surface of the cavity; place the laser plumb bob 4 on the tripod support platform, connect the screw rod on the tripod to the laser plumb bob 4, and tighten the screw; turn on the power switch of the instrument, first turn on the projection point switch, so that the vertical laser beam is aligned with O. 11 Next, observe the coarse bubble, adjust the tripod, and center the coarse bubble; then check the laser beam and O. 11If there is a misalignment, the instrument position and coarse leveling need to be adjusted further until the coarse leveling bubble is centered and the laser beam is aligned with the O-shape. 11 After coarse leveling, rotate the laser plumb bob 4 and use the triangular adjustment method to adjust the fine-tuning screw of the instrument to center the fine-tuning bubble of the laser plumb bob 4, ensuring that the fine-tuning bubble remains centered when rotating the instrument back and forth. Next, rotate the plumb bob 180 degrees so that the upper laser becomes the lower laser. The intersection of the laser and the ground at this point is the second measurement point, denoted as O. 01 .

[0057] Repeat the above steps so that the transparent target 3 is placed sequentially at the intersection of different groups of thin ropes and the center of the transparent target 3 is aligned with O. 12 / O 13 / …… / O 1n The second measurement point O can be obtained respectively. 02 / O 03 / …… / O 0n .

[0058] Before this step, it is necessary to ensure that there is no water accumulation in the cavity 11 of the hybrid tower fan foundation to reduce the impact on construction and measurement.

[0059] S4. Determine the center of the hybrid tower fan foundation 1 based on the second measurement point. For example... Figure 4 As shown, the specific steps are as follows: Connect n second measurement points on the ground in sequence to form the first figure, that is, connect O on the ground. 01 / O 02 / …… / O 0n Connect the lines to form the first shape. When n is 1, the resulting shape is a point; when n is 2, the resulting shape is a point or a line; when n is 3, the resulting shape is a point, a line, or a triangle, and so on. Find the shape from O using mathematical geometry principles. 01 / O 02 / …… / O 0n The center of the point, line, or polygon formed is the first center point 5, denoted as O0. When the first shape is a point, the center of the first shape is that point; when the first shape is a line, the center of the first shape is the midpoint of the line segment; when the first shape is a polygon, the center of the first shape is the centroid of the polygon. Remove O. 11 / O 12 / …… / O 1n The transparent target 3 and the thin rope.

[0060] Align the lower laser beam of the laser plumb line 4 with the first center point 5; then observe the coarse leveling bubble, adjust the tripod, and center the coarse leveling bubble; then check for any offset between the laser beam and O0. If there is offset, continue adjusting the position of the laser plumb line 4 and the coarse leveling until the coarse leveling bubble is centered and the laser beam coincides with the first center point 5; after coarse leveling, rotate the laser plumb line 4 and use the triangular adjustment method to adjust the fine adjustment screw of the instrument to center the fine adjustment bubble of the laser plumb line 4, ensuring that the fine adjustment bubble remains centered when rotating the instrument back and forth. Rotate the plumb line 180 degrees to change the lower laser beam to the upper laser beam, as shown below. Figure 6 As shown, two mutually perpendicular thin ropes A and B are then stretched taut on the top surface of the hybrid tower wind turbine foundation 1 and the splicing area of ​​the hybrid tower. The two ends of rope A are oriented towards 0 degrees and 180 degrees respectively. The orientation of the doorway of the hybrid tower wind turbine foundation 1 is recorded as the 0-degree direction. Figure 6 The X direction is 0 degrees. Keep ropes A and B taut and place the center of the transparent target 3 at the intersection of ropes A and B. Continuously adjust the center position of the transparent target 3 to ensure that the center position of the transparent target 3 coincides with the upper laser beam. At this time, the center position of the transparent target 3 is the second center point 6, denoted as O2, which is the center of the hybrid wind turbine foundation 1 at the elevation of the top surface of the foundation. The line connecting the first center point 5 and the second center point 6 is the center line of the hybrid wind turbine foundation 1.

[0061] S5. Determine the installation positioning of the mixing tower ring plate: such as Figure 5 As shown, the specific steps are as follows: Within the horizontal plane where the top surface of the wind turbine foundation is located (denoted as h1), with the second center point 6 as the center, draw circles within the h1 plane with the outer diameter and inner diameter of the tower bottom as diameters, respectively. These circles serve as the outer and inner contour lines of the hybrid tower's bottom ring. The ring formed by the inner and outer contour lines constitutes the connection area between the hybrid tower wind turbine foundation 1 and the hybrid tower.

[0062] The above method allows for faster installation and positioning of the hybrid tower rings during reinstallation, ensuring the site is ready for hybrid tower installation. This guarantees the new tower structure's centerline coincides with the wind turbine foundation's center. Prioritizing the positioning of the existing foundation's center is crucial to prevent issues such as tower center misalignment, flatness not meeting design requirements, or uneven foundation settlement, which could pose significant safety risks to the hybrid tower's later operation. The method is simple, quick, and labor-saving. It utilizes conventional measuring tools and instruments, eliminating the need for complex, high-end equipment. It is adaptable to various wind turbine foundation and hybrid tower structures, offering broad industry applicability. It is suitable for locating the hybrid tower foundation center in wind farm demolition and reconstruction projects, and also for re-measuring the wind turbine foundation center in new wind farm projects. It is applicable to both cases where the prestressed steel strand buried pipe 2 is uniformly distributed circumferentially in the hybrid tower foundation and cases where the prestressed steel strand buried pipe 2 is not uniformly distributed circumferentially in the hybrid tower foundation.

[0063] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method of measuring the center of a wind turbine foundation, characterized in that, The method comprises the following steps: grouping and connecting a plurality of pre-stressed steel strand buried pipes (2) in a mixed tower fan foundation (1) to form a plurality of first measuring straight lines (21); grouping the plurality of first measuring straight lines (21), and forming first measuring points by intersecting two first measuring straight lines (21) in the same group; determining second measuring points of the bottom surface of the mixed tower fan foundation (1) according to the first measuring points; and determining the center of the mixed tower fan foundation (1) according to the second measuring points. The step of "grouping and connecting a plurality of pre-stressed steel strand buried pipes (2) in a mixed tower fan foundation (1) to form a plurality of first measuring straight lines (21)" specifically comprises the following steps: Selecting 4n pre-stressed steel strand buried pipes (2) on the mixed tower fan foundation (1) to determine the center points of the 4n pre-buried pipes; selecting two pre-stressed steel strand buried pipes with the farthest center relative distance as a group, and connecting the center points of the pre-stressed steel strand buried pipes in each group to form 2n first measuring straight lines (21); Wherein, n is a positive integer; The step of "selecting two pre-stressed steel strand buried pipes with the farthest center relative distance as a group, and connecting the center points of the pre-stressed steel strand buried pipes in each group to form 2n first measuring straight lines (21)" specifically comprises: Selecting an arbitrary pre-stressed steel strand buried pipe as the a-th pre-stressed steel strand buried pipe, and selecting 2n-1 pre-stressed steel strand buried pipes as the 2n+a-th pre-stressed steel strand buried pipe, which are spaced apart along the clockwise or counterclockwise direction; connecting the center points of the a-th pre-stressed steel strand buried pipe and the 2n+a-th pre-stressed steel strand buried pipe to form the a-th first measuring straight line (21); Repeating the above steps until 2n different first measuring straight lines (21) are obtained; Wherein, a is a positive integer; The step of "grouping a plurality of first measuring straight lines (21), and forming first measuring points by intersecting two first measuring straight lines (21) in the same group" specifically comprises the following steps: Selecting an arbitrary first measuring straight line (21) as the b-th first measuring straight line, and selecting n-1 first measuring straight lines (21) as the n+b-th first measuring straight line, which are spaced apart along the clockwise or counterclockwise direction; connecting the b-th first measuring straight line (21) and the n+b-th first measuring straight line (21) to form a group, respectively pulling the two ropes, and the intersection point of the two ropes is the b-th first measuring point; Repeating the above steps until n different first measuring points are obtained; Wherein, b is a positive integer; The step of "determining second measuring points of the bottom surface of the mixed tower fan foundation (1) according to the first measuring points" specifically comprises: Placing a transparent target (3) at the intersection position of the corresponding pulling ropes of any one group of first measuring straight lines (21), and aligning the center of the transparent target (3) with the first measuring point corresponding to the group of first measuring straight lines (21); placing a laser plummet (4) corresponding to the first measuring point in the cavity (11) of the mixed tower fan foundation; aligning the first measuring point with the vertical upward laser of the laser plummet (4); rotating the plummet by 180 degrees so that the upper laser becomes a lower laser, and at this time the intersection point of the laser and the ground is a second measuring point; Repeating the above steps until n second measuring points corresponding to the n first measuring points are obtained; n second measuring points are sequentially connected on the ground to form a first figure; The step of "determining the center of the mixed tower fan foundation (1) according to the second measuring points" specifically comprises the following steps: finding the center of the first figure, denoted as a first center point (5); vertically aligning the first center point (5) downward with the lower laser of the laser plumb instrument (4); rotating the plumb instrument by 180 degrees so that the lower laser becomes an upper laser; pulling two fine ropes perpendicular to each other at the foundation top surface elevation; placing the transparent target (3) center at the intersection of the two fine ropes, and adjusting the transparent target (3) center position to coincide with the laser beam, at which time the transparent target (3) center position is a second center point (6); determining the center line of the mixed tower fan foundation (1): connecting the first center point (5) and the second center point (6).

2. The method of measuring the center of a tower foundation for a wind turbine according to claim 1, wherein, The first figure is a point, a line, or a polygon.

3. The method of measuring the center of a tower foundation for a wind turbine according to claim 2, wherein, The method further comprises the following steps: determining the installation position of the mixed tower ring: in the horizontal plane at the fan foundation top surface elevation, drawing a circle with the second center point (6) as the center and the outer diameter of the tower drum bottom and the inner diameter of the tower drum bottom as the diameters, as the outer contour line and the inner contour line of the mixed tower bottom ring; the circular ring enclosed by the inner and outer contour lines is the installation positioning area of the mixed tower ring.

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