A wind turbine foundation reinforcement deviation correction method

Abstract

The application discloses a wind turbine foundation reinforcing deviation rectification method, and comprises the following steps: selecting 6-10 measuring points on a tower drum foundation ring, placing corresponding number of leveling rods on the measuring points, then measuring the elevation value and the foundation ring levelness of each measuring point by using a level, determining the highest point and the lowest point of the foundation ring and the horizontal deviation value of the foundation ring according to the measured foundation ring levelness; installing the lowest point jack: the wind turbine blade is yawed to the highest point side of the foundation ring, 3-5 jacks are installed at the lowest point position, and the output end of the jack is tightly jacked against the flange at the root of the tower drum. The highest point and the lowest point of the tower drum foundation ring are measured first, the number of jacks is step by step increased and the load of the jack is step by step increased by using the jack to the lowest point, so that the safety is higher when the tower drum is rectified, and the rectification precision is higher when the wind power tower drum foundation is reinforced.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a method for correcting the deviation of wind turbine foundations. Background Technology

[0002] Wind turbine foundation damage incidents are among the earliest occurrences in the new energy industry. Current technology has been used to reinforce and repair the foundations of multiple turbines. However, even after reinforcement and repair, significant swaying and shaking at the base of the towers due to foundation damage still exists during turbine operation, and there is a clear trend of further deterioration. To ensure safe production, wind turbines in wind farms with foundation damage need to operate at 1 / 3 of their load limit. Wind turbines operating at their load limit will experience reduced power generation and are at risk of tower collapse.

[0003] Chinese Patent No. CN 202111342247.8 discloses a method for correcting the levelness of the top of a monopile of an offshore wind turbine foundation, comprising: Step 1, performing a levelness scan on the top surface of the top flange of the monopile on-site to find the highest and lowest points of the top flange and obtain the maximum height difference of the top surface of the top flange; Step 2, calculating the levelness of the top surface of the top flange based on the maximum height difference of the top surface of the top flange and the diameter of the monopile; Step 3, drawing a schematic diagram of the correction scheme for the bottom section tower of the wind turbine; Step 4, drawing a correction cutting process drawing for the already processed bottom section tower at the tower manufacturing plant; Step 5, first cutting the bottom section tower from the bottom flange, then correcting and cutting the bottom section tower according to the correction cutting process drawing, and then re-welding the bottom flange to the bottom section tower; Step 6, transporting the bottom section tower with the re-welded bottom flange to the site, and then connecting the bottom flange to the top flange of the monopile.

[0004] When reinforcing wind turbine tower foundations, it is necessary to correct the foundation's deviation before proceeding with reinforcement. However, existing technologies for correcting wind turbine tower deviation have low precision, failing to meet standard requirements. This results in the wind turbine still experiencing vibration issues after foundation reinforcement. Therefore, there is an urgent need to design a deviation correction method for wind turbine foundation reinforcement to solve these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for correcting the deviation of wind turbine foundations to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for correcting deviations in wind turbine foundation reinforcement includes the following steps:

[0008] Measurement steps: Select 6-10 measurement points on the tower foundation ring, and place the corresponding number of leveling rods on the measurement points. Then, use a level instrument to measure the elevation value of each measurement point and the levelness of the foundation ring in sequence. Based on the measured levelness of the foundation ring, determine the highest and lowest points of the foundation ring, as well as the horizontal deviation value of the foundation ring.

[0009] Steps for installing the lowest point jack: Yaw the wind turbine blades to the side of the highest point of the foundation ring, and install 3-5 jacks at the lowest point, and tighten the output end of the jacks against the upper flange at the root of the tower.

[0010] Steps for installing the highest point jacks: Install several jacks at the highest point and tighten the output end of the jacks against the upper flange at the root of the tower.

[0011] Loading procedure: Apply the predetermined load to all jacks on the lowest point side in stages, and measure the horizontal deviation of the foundation ring with a level to see if it is less than the standard value.

[0012] Steps for installing jacks: If the horizontal deviation of the foundation ring is greater than the standard value, install jacks at the lowest point and apply the predetermined load step by step, and then measure the horizontal deviation of the foundation ring with a level to see if it is less than the standard value.

[0013] Start-up procedure: If the horizontal deviation of the foundation ring is greater than the standard value, start the fan and repeat the jacking procedure until the horizontal deviation of the foundation ring is less than the standard value.

[0014] Foundation reinforcement steps: When the horizontal deviation of the foundation ring is less than the standard value, epoxy resin is injected into the broken cavity formed after the tower foundation is corrected. Then, steel mesh is arranged on the foundation surface and high-performance concrete is poured for reinforcement.

[0015] Furthermore, in the measurement step, an online monitoring device is installed on one side of the highest point of the tower foundation ring, and a laser level is set up on the foundation surface inside the tower. The online monitoring device is used for full-process monitoring of the wind turbine tower correction construction. After the online monitoring device is installed, if there are heightening columns on the tower foundation, the heightening columns are removed down to the original foundation surface.

[0016] Furthermore, in the step of installing the lowest point jack, the jack located in the middle position corresponds to the lowest point of the foundation ring, and the distance between two adjacent jacks is 600mm-1000mm. In the step of installing the highest point jack, the number of jacks installed is 1.

[0017] Furthermore, in the load application step, the method of applying the predetermined load in steps is as follows: first, raise the load of all jacks on the lowest point side to 30 MPa, and measure in real time whether the horizontal deviation value of the base ring is less than the standard value, and observe whether the data detected by the observation line monitoring device and the laser level are abnormal. If it is determined that the data is not abnormal, then increase it by 5-10 MPa in sequence until it is increased to 50 MPa.

[0018] Furthermore, the jack is loaded with 5-10 MPa in sequence and then left to stand for 1 hour. When the jack load is increased to 50 MPa, it is left to stand for 24 hours. The jack is a self-locking jack.

[0019] Furthermore, in the step of installing jacks, the number of jacks installed is 2-4, and the installation position is symmetrical based on the lowest point of the tower foundation ring. The range of the load supported by the jacks is 0-50 MPa, and the standard value of the horizontal deviation of the foundation ring is 5 mm.

[0020] Furthermore, in the measurement step, after measuring the horizontal deviation value of the foundation ring, 8-12 grouting holes are drilled on the outside of the foundation ring according to the distribution of the internal steel reinforcement of the tower foundation, and the continuity between the grouting holes and the cavity at the bottom of the tower foundation is tested. In the foundation reinforcement step, grout is injected into the grouting holes using two grouting machines.

[0021] Furthermore, when grouting into the grouting holes using two grouting machines, one grouting machine selects the grouting hole with the best penetration for grouting, while the other grouting machine grouts into the grouting hole on the other side. The grouting pressure of the grouting machines is 0.3-0.6MPa. When pure grout overflows from a grouting hole, it is sealed until grout overflows from all grouting holes. After all grouting holes overflow, let it stand for 10-20 minutes and continue grouting until it can no longer be grouted.

[0022] Furthermore, in the foundation reinforcement step, studs are welded to the inner and outer walls of the foundation ring before the steel mesh is laid. The studs are arranged in a quincunx pattern and are arranged vertically in 3-5 layers. Then, vertical bars are implanted into the original foundation surface, and ring bars connected to the vertical bars are welded around the tower. The original foundation surface is then flushed.

[0023] Furthermore, in the foundation reinforcement step, after the original foundation surface is dry, an interface agent is sprayed, then a template is erected around the ring reinforcement and high-performance concrete is poured. After the high-performance concrete surface is smoothed, it is promptly covered with a film for curing. The curing time is 5-10 days.

[0024] In the above technical solution, the present invention provides a method for correcting the deviation of wind turbine foundation reinforcement, which has the following beneficial effects:

[0025] (1) The present invention first measures the highest and lowest points of the tower foundation ring, and then increases the number of jacks and the load of the jacks at the lowest point in stages, making it safer to correct the tower and making the correction accuracy higher when reinforcing the wind power tower foundation.

[0026] (2) By correcting the deviation when the wind turbine starts, the present invention can utilize the swing generated during the operation of the wind turbine to form a leverage effect, thereby reducing the difficulty of correction and improving the efficiency of correction.

[0027] (3) The present invention fills the broken cavity formed after correction with epoxy resin, so that the epoxy resin with better fluidity can completely penetrate into the small gap of the broken cavity, making the wind turbine tower foundation more firmly reinforced.

[0028] (4) The present invention embeds vertical bars into the original foundation surface and welds studs on the inner and outer walls of the foundation ring. Then, the ring bars and vertical bars are fixed and high-performance concrete is poured, which makes the connection between the new foundation surface and the original foundation surface stronger, thereby making the wind turbine tower foundation reinforcement more stable. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0030] Figure 1 This is a flowchart of a method for correcting deviations in the foundation reinforcement of a wind turbine generator according to the present invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figure 1 The present invention will now be described in further detail.

[0032] Example 1

[0033] A method for correcting deviations in wind turbine foundation reinforcement includes the following steps:

[0034] Measurement steps: Select 8 measurement points on the tower foundation ring. The measurement points are distributed in a ring in 8 directions on the foundation ring. Place the corresponding number of leveling rods on the measurement points. Then use a level instrument to measure the elevation value of each measurement point and the levelness of the foundation ring in sequence. Based on the measured levelness of the foundation ring, determine the highest and lowest points of the foundation ring, as well as the horizontal deviation value of the foundation ring.

[0035] Steps for installing the lowest point jack: Yaw the wind turbine blades to the side of the highest point of the foundation ring. Since a large load is required for correction, increase the correction load by using the gravity of the wind turbine and blades to reduce the difficulty of correction. Install 3 jacks at the lowest point and tighten the output end of the jacks against the upper flange at the root of the tower. The jack in the middle position corresponds to the lowest point of the foundation ring, and the distance between two adjacent jacks is 1000mm. In the step of installing the highest point jack, install 1 jack. After installation, check whether the online monitoring device and level are in normal working condition.

[0036] Steps for installing the highest point jacks: Install several jacks at the highest point and tighten the output end of the jacks against the upper flange at the base of the tower for support and fixation.

[0037] Loading procedure: Apply the predetermined load to all jacks on the lowest point side in stages, and measure the horizontal deviation of the foundation ring with a level to see if it is less than the standard value. The method of applying the predetermined load in stages is as follows: First, raise the load of all jacks on the lowest point side to 30 MPa, and measure the horizontal deviation of the foundation ring in real time to see if it is less than the standard value. The standard value of the horizontal deviation of the foundation ring is 5 mm. When the standard value of the horizontal deviation of the foundation ring is less than 5 mm, proceed directly to the foundation reinforcement step, and observe whether the data detected by the line monitoring device and the laser level are abnormal. The data detected by the line monitoring device and the laser level reflect the dangerous situation of the foundation and the tower. If the data is confirmed to be normal, increase the load by 5 MPa in stages until it reaches 50 MPa. After each jack load is increased by 5 MPa, let it stand for 1 hour. When the jack load is increased to 50 MPa, let it stand for 24 hours. The jacks are self-locking jacks.

[0038] Jack installation steps: If the horizontal deviation of the foundation ring is greater than the standard value, install jacks at the lowest point and apply the predetermined load in steps. Then, use a level to measure whether the horizontal deviation of the foundation ring is less than the standard value. Two jacks are installed, and the installation positions are symmetrical based on the lowest point of the tower foundation ring. The maximum load supported by the jacks is 50 MPa. The standard value of the horizontal deviation of the foundation ring is 5 mm. When the standard value of the horizontal deviation of the foundation ring is less than 5 mm, proceed directly to the foundation reinforcement step.

[0039] Start-up procedure: If the horizontal deviation of the foundation ring is greater than the standard value, start the fan and use the fan's own swing amplitude to adjust so that it can form a force-assisted effect during correction. Repeat the step of adding jacks until the horizontal deviation of the foundation ring is less than the standard value.

[0040] Foundation reinforcement steps: When the horizontal deviation of the foundation ring is less than the standard value, epoxy resin is injected into the broken cavity formed after the tower foundation is corrected. Then, a steel mesh is laid on the foundation surface and high-performance concrete is poured for reinforcement. Before laying the steel mesh, studs are welded to the inner and outer walls of the foundation ring. The studs are arranged in a quincunx pattern and three layers of studs are arranged vertically. Then, vertical bars are inserted into the original foundation surface, and ring bars connected to the vertical bars are welded around the tower. The original foundation surface is then washed. After the original foundation surface dries, an interface agent is sprayed. Then, a formwork is erected around the ring bars and high-performance concrete is poured. After the high-performance concrete surface is smoothed, it is covered with a film for curing in a timely manner to keep the concrete moist. The concrete curing time is 5 days.

[0041] Furthermore, in the measurement process, an online monitoring device is installed on one side of the highest point of the tower foundation ring. The online monitoring device is debugged and its monitoring data transmission stability is tested. A laser level is set up on the foundation surface inside the tower. The online monitoring device is used for full-process monitoring of wind turbine tower tilt correction construction. After the online monitoring device is installed, if there are raised columns in the tower foundation, the raised columns are removed down to the original foundation surface, i.e., the first layer of steel mesh of the original foundation. The risk of wind turbine collapse that may occur during the removal of raised columns and tower tilt correction is monitored in real time throughout the process by the online monitoring device and the laser level. If any abnormality occurs, emergency shutdown and work stoppage measures can be taken immediately. Scale lines are painted on the flange wall on the foundation ring. The laser level continuously emits laser light and records the data to assist in visually observing the tower tilt change trend on-site during the removal of the raised columns and tilt correction. If any abnormality occurs, emergency shutdown and work stoppage measures can be taken immediately.

[0042] Furthermore, in the measurement step, after measuring the horizontal deviation value of the foundation ring, eight grouting holes are drilled on the outside of the foundation ring according to the distribution of the internal steel reinforcement of the tower foundation. The location of the grouting holes is determined according to the damage of the concrete, and the continuity between the grouting holes and the cavity at the bottom of the tower foundation is tested. The distance from the center of the grouting hole to the edge of the foundation ring is 80cm-200mm. In the foundation reinforcement step, grout is injected into the grouting holes using two grouting machines.

[0043] Furthermore, when grouting into the grouting holes using two grouting machines, one grouting machine selects the grouting hole with the best penetration for grouting, while the other grouting machine grouts into the grouting hole on the other side. The grouting pressure of the grouting machines is 0.4 MPa. When pure grout overflows from a grouting hole, it is sealed until grout is overflowing from all grouting holes. At the same time, grout also overflows from the gap between the foundation ring wall and the foundation concrete inside the tower. After all grouting holes are overflowing, let it stand for 10 minutes and continue grouting until it can no longer be grouted. If there is a single hole that does not overflow, then grout that single hole is grouted until grout overflows.

[0044] Example 2

[0045] A method for correcting deviations in wind turbine foundation reinforcement includes the following steps:

[0046] Measurement steps: Select 8 measurement points on the tower foundation ring. The measurement points are distributed in a ring in 8 directions on the foundation ring. Place the corresponding number of leveling rods on the measurement points. Then use a level instrument to measure the elevation value of each measurement point and the levelness of the foundation ring in sequence. Based on the measured levelness of the foundation ring, determine the highest and lowest points of the foundation ring, as well as the horizontal deviation value of the foundation ring.

[0047] Steps for installing the lowest point jack: Yaw the wind turbine blades to the side of the highest point of the foundation ring. Since a large load is required for correction, increase the correction load by using the gravity of the wind turbine and blades to reduce the difficulty of correction. Install 3 jacks at the lowest point and tighten the output end of the jacks against the upper flange at the root of the tower. The jack in the middle position corresponds to the lowest point of the foundation ring, and the distance between two adjacent jacks is 1000mm. In the step of installing the highest point jack, install 1 jack. After installation, check whether the online monitoring device and level are in normal working condition.

[0048] Steps for installing the highest point jacks: Install several jacks at the highest point and tighten the output end of the jacks against the upper flange at the base of the tower for support and fixation.

[0049] Loading procedure: Apply the predetermined load to all jacks on the lowest point side in stages, and measure the horizontal deviation of the foundation ring with a level to see if it is less than the standard value. The method of applying the predetermined load in stages is as follows: First, raise the load of all jacks on the lowest point side to 30 MPa, and measure the horizontal deviation of the foundation ring in real time to see if it is less than the standard value. The standard value of the horizontal deviation of the foundation ring is 5 mm. When the standard value of the horizontal deviation of the foundation ring is less than 5 mm, proceed directly to the foundation reinforcement step, and observe whether the data detected by the observation line monitoring device and the laser level are abnormal. The data detected by the observation line monitoring device and the laser level reflect the dangerous situation of the foundation and tower. If the data is confirmed to be normal, increase the load by 7 MPa in sequence until it reaches 50 MPa. After each jack load is increased by 5 MPa, let it stand for 1 hour. When the jack load is increased to 50 MPa, let it stand for 24 hours. The jacks are self-locking jacks.

[0050] Jack installation steps: If the horizontal deviation of the foundation ring is greater than the standard value, install jacks at the lowest point and apply the predetermined load in steps. Then, use a level to measure whether the horizontal deviation of the foundation ring is less than the standard value. Two jacks are installed, and the installation positions are symmetrical based on the lowest point of the tower foundation ring. The maximum load supported by the jacks is 50 MPa. The standard value of the horizontal deviation of the foundation ring is 5 mm. When the standard value of the horizontal deviation of the foundation ring is less than 5 mm, proceed directly to the foundation reinforcement step.

[0051] Start-up procedure: If the horizontal deviation of the foundation ring is greater than the standard value, start the fan and use the fan's own swing amplitude to adjust so that it can form a force-assisted effect during correction. Repeat the step of adding jacks until the horizontal deviation of the foundation ring is less than the standard value.

[0052] Foundation reinforcement steps: When the horizontal deviation of the foundation ring is less than the standard value, epoxy resin is injected into the broken cavity formed after the tower foundation is corrected. Then, a steel mesh is laid on the foundation surface and high-performance concrete is poured for reinforcement. Before laying the steel mesh, studs are welded to the inner and outer walls of the foundation ring. The studs are arranged in a quincunx pattern and three layers of studs are arranged vertically. Then, vertical bars are inserted into the original foundation surface, and ring bars connected to the vertical bars are welded around the tower. The original foundation surface is then washed. After the original foundation surface dries, an interface agent is sprayed. Then, a formwork is erected around the ring bars and high-performance concrete is poured. After the high-performance concrete surface is smoothed, it is covered with a film for curing in a timely manner to keep the concrete moist. The concrete curing time is 5 days.

[0053] Furthermore, in the measurement process, an online monitoring device is installed on one side of the highest point of the tower foundation ring. The online monitoring device is debugged and its monitoring data transmission stability is tested. A laser level is set up on the foundation surface inside the tower. The online monitoring device is used for full-process monitoring of wind turbine tower tilt correction construction. After the online monitoring device is installed, if there are raised columns in the tower foundation, the raised columns are removed down to the original foundation surface, i.e., the first layer of steel mesh of the original foundation. The risk of wind turbine collapse that may occur during the removal of raised columns and tower tilt correction is monitored in real time throughout the process by the online monitoring device and the laser level. If any abnormality occurs, emergency shutdown and work stoppage measures can be taken immediately. Scale lines are painted on the flange wall on the foundation ring. The laser level continuously emits laser light and records the data to assist in visually observing the tower tilt change trend on-site during the removal of the raised columns and tilt correction. If any abnormality occurs, emergency shutdown and work stoppage measures can be taken immediately.

[0054] Furthermore, in the measurement step, after measuring the horizontal deviation value of the foundation ring, eight grouting holes are drilled on the outside of the foundation ring according to the distribution of the internal steel reinforcement of the tower foundation. The location of the grouting holes is determined according to the damage of the concrete, and the continuity between the grouting holes and the cavity at the bottom of the tower foundation is tested. The distance from the center of the grouting hole to the edge of the foundation ring is 80cm-200mm. In the foundation reinforcement step, grout is injected into the grouting holes using two grouting machines.

[0055] Furthermore, when grouting into the grouting holes using two grouting machines, one grouting machine selects the grouting hole with the best penetration for grouting, while the other grouting machine grouts into the grouting hole on the other side. The grouting pressure of the grouting machines is 0.4 MPa. When pure grout overflows from a grouting hole, it is sealed until grout is overflowing from all grouting holes. At the same time, grout also overflows from the gap between the foundation ring wall and the foundation concrete inside the tower. After all grouting holes are overflowing, let it stand for 10 minutes and continue grouting until it can no longer be grouted. If there is a single hole that does not overflow, then grout that single hole is grouted until grout overflows.

[0056] Example 3

[0057] A method for correcting deviations in wind turbine foundation reinforcement includes the following steps:

[0058] Measurement steps: Select 8 measurement points on the tower foundation ring, with the measurement points distributed in a ring in 8 directions on the foundation ring. Place the corresponding number of leveling rods on the measurement points, and then use a level to measure the elevation value of each measurement point and the levelness of the foundation ring in sequence. Based on the measured levelness of the foundation ring, determine the highest and lowest points of the foundation ring, as well as the horizontal deviation value of the foundation ring. After measuring the horizontal deviation value of the foundation ring, drill 8 grouting holes on the outside of the foundation ring according to the distribution of the internal steel reinforcement of the tower foundation. The location of the grouting holes depends on the damage of the concrete. Test the continuity between the grouting holes and the cavity at the bottom of the tower foundation. The distance from the center of the grouting hole to the edge of the foundation ring is 80cm-200mm.

[0059] Steps for installing the lowest point jack: Yaw the wind turbine blades to the side of the highest point of the foundation ring. Since a large load is required for correction, increase the correction load by using the gravity of the wind turbine and blades to reduce the difficulty of correction. Install 3 jacks at the lowest point and tighten the output end of the jacks against the upper flange at the root of the tower. The jack in the middle position corresponds to the lowest point of the foundation ring, and the distance between two adjacent jacks is 1000mm. In the step of installing the highest point jack, install 1 jack. After installation, check whether the online monitoring device and level are in normal working condition.

[0060] Steps for installing the highest point jacks: Install several jacks at the highest point and tighten the output end of the jacks against the upper flange at the base of the tower for support and fixation.

[0061] Loading procedure: Apply the predetermined load to all jacks on the lowest point side in stages, and measure the horizontal deviation of the foundation ring with a level to see if it is less than the standard value. The method of applying the predetermined load in stages is as follows: First, raise the load of all jacks on the lowest point side to 30 MPa, and measure the horizontal deviation of the foundation ring in real time to see if it is less than the standard value. The standard value of the horizontal deviation of the foundation ring is 5 mm. When the standard value of the horizontal deviation of the foundation ring is less than 5 mm, proceed directly to the foundation reinforcement step, and observe whether the data detected by the line monitoring device and the laser level are abnormal. The data detected by the line monitoring device and the laser level reflect the dangerous situation of the foundation and the tower. If the data is confirmed to be normal, increase the load by 10 MPa in stages until it reaches 50 MPa. After each jack load is increased by 5 MPa, let it stand for 1 hour. When the jack load is increased to 50 MPa, let it stand for 24 hours. The jacks are self-locking jacks.

[0062] Jack installation steps: If the horizontal deviation of the foundation ring is greater than the standard value, install jacks at the lowest point and apply the predetermined load in steps. Then, use a level to measure whether the horizontal deviation of the foundation ring is less than the standard value. Two jacks are installed, and the installation positions are symmetrical based on the lowest point of the tower foundation ring. The maximum load supported by the jacks is 50 MPa. The standard value of the horizontal deviation of the foundation ring is 5 mm. When the standard value of the horizontal deviation of the foundation ring is less than 5 mm, proceed directly to the foundation reinforcement step.

[0063] Start-up procedure: If the horizontal deviation of the foundation ring is greater than the standard value, start the fan and use the fan's own swing amplitude to adjust so that it can form a force-assisted effect during correction. Repeat the step of adding jacks until the horizontal deviation of the foundation ring is less than the standard value.

[0064] Foundation reinforcement steps: When the horizontal deviation of the foundation ring is less than the standard value, epoxy resin is injected into the broken cavity formed after the tower foundation is corrected. Then, a steel mesh is laid on the foundation surface and high-performance concrete is poured for reinforcement. Before laying the steel mesh, studs are welded to the inner and outer walls of the foundation ring. The studs are arranged in a quincunx pattern and three layers are vertically arranged. Then, vertical reinforcement bars are inserted into the original foundation surface, and ring reinforcement bars connected to the vertical reinforcement bars are welded around the tower. The original foundation surface is then washed. After the original foundation surface dries, an interface agent is sprayed. Then, formwork is erected around the ring reinforcement bars and high-performance concrete is poured. After the high-performance concrete surface is smoothed, it is promptly covered with a film for curing. Keep the concrete moist and allow it to cure for 5 days. During the foundation reinforcement process, grout is injected into the grouting holes using two grouting machines. One machine selects the grouting hole with the best penetration for grouting, while the other machine injects grout into the grouting hole on the other side. The grouting pressure is 0.4 MPa. When pure grout overflows from a grouting hole, it is sealed until grout is coming out of all grouting holes. At the same time, grout also comes out from the gap between the foundation ring wall and the foundation concrete inside the tower. After all grouting holes are coming out of grout, let it stand for 10 minutes and continue grouting until no more grout can be injected. If there is a single hole that is not coming out of grout, then grout that single hole until grout comes out.

[0065] Furthermore, in the measurement process, an online monitoring device is installed on one side of the highest point of the tower foundation ring. The online monitoring device is debugged and its monitoring data transmission stability is tested. A laser level is set up on the foundation surface inside the tower. The online monitoring device is used for full-process monitoring of wind turbine tower tilt correction construction. After the online monitoring device is installed, if there are raised columns in the tower foundation, the raised columns are removed down to the original foundation surface, i.e., the first layer of steel mesh of the original foundation. The risk of wind turbine collapse that may occur during the removal of raised columns and tower tilt correction is monitored in real time throughout the process by the online monitoring device and the laser level. If any abnormality occurs, emergency shutdown and work stoppage measures can be taken immediately. Scale lines are painted on the flange wall on the foundation ring. The laser level continuously emits laser light and records the data to assist in visually observing the tower tilt change trend on-site during the removal of the raised columns and tilt correction. If any abnormality occurs, emergency shutdown and work stoppage measures can be taken immediately.

[0066] In Examples 1, 2, and 3, the only difference is the load added sequentially by the jacks; the other parameters are the same. The final deviations of the foundation rings for correction in Examples 1, 2, and 3 are 2.3 mm, 3.6 mm, and 4.3 mm, respectively. The foundation ring of the wind turbine tower with the highest accuracy was corrected in Example 1, therefore Example 1 has the best effect.

[0067] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for correcting deviations in wind turbine foundation reinforcement, characterized in that, Includes the following steps: Measurement steps: Select 6-10 measurement points on the tower foundation ring, and place the corresponding number of leveling rods on the measurement points. Then, use a level instrument to measure the elevation value of each measurement point and the levelness of the foundation ring in sequence. Based on the measured levelness of the foundation ring, determine the highest and lowest points of the foundation ring, as well as the horizontal deviation value of the foundation ring. Steps for installing the lowest point jack: Yaw the wind turbine blades to the side of the highest point of the foundation ring, and install 3-5 jacks at the lowest point, and tighten the output end of the jacks against the upper flange at the root of the tower. Steps for installing the highest point jacks: Install several jacks at the highest point and tighten the output end of the jacks against the upper flange at the root of the tower. Loading procedure: Apply the predetermined load to all jacks on the lowest point side in stages, and measure the horizontal deviation of the foundation ring with a level to see if it is less than the standard value. Steps for installing jacks: If the horizontal deviation of the foundation ring is greater than the standard value, install jacks at the lowest point and apply the predetermined load step by step, and then measure the horizontal deviation of the foundation ring with a level to see if it is less than the standard value. Start-up procedure: If the horizontal deviation of the foundation ring is greater than the standard value, start the fan and repeat the jacking procedure until the horizontal deviation of the foundation ring is less than the standard value. Foundation reinforcement steps: When the horizontal deviation of the foundation ring is less than the standard value, epoxy resin is injected into the broken cavity formed after the tower foundation is corrected. Then, steel mesh is arranged on the foundation surface and high-performance concrete is poured for reinforcement.

2. The method for correcting deviations in wind turbine foundation reinforcement according to claim 1, characterized in that, In the measurement step, an online monitoring device is installed on one side of the highest point of the tower foundation ring, and a laser level is set up on the foundation surface inside the tower. The online monitoring device is used for full-process monitoring of the wind turbine tower correction construction. After the online monitoring device is installed, if there are heightening columns on the tower foundation, the heightening columns are removed down to the original foundation surface.

3. The method for correcting deviations in wind turbine foundation reinforcement according to claim 2, characterized in that, In the step of installing the lowest point jack, the jack located in the middle position corresponds to the lowest point of the foundation ring, and the distance between two adjacent jacks is 600mm-1000mm. In the step of installing the highest point jack, one jack is installed.

4. The method for correcting deviations in wind turbine foundation reinforcement according to claim 3, characterized in that, In the load application step, the method of applying the predetermined load in steps is as follows: First, raise the load of all jacks on the lowest point side to 30 MPa, and measure in real time whether the horizontal deviation value of the base ring is less than the standard value, and observe whether the data detected by the observation line monitoring device and the laser level are abnormal. If the data is confirmed to be normal, increase the load by 5-10 MPa in sequence until it reaches 50 MPa.

5. The method for correcting deviations in wind turbine foundation reinforcement according to claim 4, characterized in that, The jack is loaded with a load of 5-10 MPa and then left to stand for 1 hour. When the load on the jack is increased to 50 MPa, it is left to stand for 24 hours. The jack is a self-locking jack.

6. The method for correcting deviations in wind turbine foundation reinforcement according to claim 1, characterized in that, In the step of adding jacks, the number of jacks added is 2-4, and the installation position is symmetrical based on the lowest point of the tower foundation ring. The range of the load supported by the jacks is 0-50 MPa, and the standard value of the horizontal deviation of the foundation ring is 5 mm.

7. The method for correcting deviations in wind turbine foundation reinforcement according to claim 1, characterized in that, In the measurement step, after measuring the horizontal deviation value of the foundation ring, 8-12 grouting holes are drilled on the outside of the foundation ring according to the distribution of the internal steel reinforcement of the tower foundation, and the continuity between the grouting holes and the cavity at the bottom of the tower foundation is tested. In the foundation reinforcement step, grout is injected into the grouting holes using two grouting machines.

8. The method for correcting deviations in wind turbine foundation reinforcement according to claim 7, characterized in that, When grouting into the grouting holes using two grouting machines, one grouting machine selects the grouting hole with the best penetration for grouting, while the other grouting machine grouts into the grouting hole on the other side. The grouting pressure of the grouting machines is 0.3-0.6MPa. When pure grout overflows from a grouting hole, it is sealed until grout overflows from all grouting holes. After all grouting holes overflow, let it stand for 10-20 minutes and continue grouting until it can no longer be grouted.

9. The method for correcting deviations in wind turbine foundation reinforcement according to claim 1, characterized in that, In the foundation reinforcement step, studs are welded to the inner and outer walls of the foundation ring before the steel mesh is laid. The studs are arranged in a quincunx pattern and are arranged vertically in 3-5 layers. Then, vertical bars are implanted into the original foundation surface, and ring bars connected to the vertical bars are welded around the tower. The original foundation surface is then flushed.

10. The method for correcting deviations in wind turbine foundation reinforcement according to claim 1, characterized in that, In the foundation reinforcement step, after the original foundation surface is dry, an interface agent is sprayed, then a template is erected around the ring reinforcement and high-performance concrete is poured. After the high-performance concrete surface is smoothed, it is promptly covered with a film for curing. The curing time is 5-10 days.

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