Wind power hybrid tower adapter ring and upper anchor plate installation method thereof

Abstract

The present invention relates to the technical field of wind power generation, and discloses a wind power hybrid tower adapter ring and an upper anchor plate installation method thereof. The wind power hybrid tower adapter ring of the present invention comprises an adapter ring body, a secondary grouting groove is arranged on the top surface of the adapter ring body, the secondary grouting groove is annular and is concentrically arranged with the adapter ring body, a secondary casting body and an annular upper anchor plate are arranged in the secondary grouting groove, and leveling bolts are respectively arranged at the inner and outer circle edges of the upper anchor plate, and the leveling bolts are evenly and spacedly arranged along the circumference of the upper anchor plate, and the leveling bolts are used to level the upper anchor plate, and the upper anchor plate is cast and fixed on the adapter ring body through the secondary casting body, and a connecting hole that passes through the adapter ring body and the upper anchor plate, and an anchor hole for installing prestressed tendons are provided on the adapter ring, and the connecting hole and the anchor hole are respectively spacedly arranged along the circumference of the adapter ring body; it can improve the flatness of the anchor plate on the adapter ring and reduce the risk of honeycombed surface and floating slurry at the junction of the bottom of the upper anchor plate and concrete.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a wind power hybrid tower adapter ring and an upper anchor plate installation method thereof. Background Art

[0002] With the transformation and upgrading of my country's energy strategy, wind power will play a more important role in the future, and the development and utilization of wind power in low wind speed areas will follow. It is estimated that by the end of 2020, the newly added grid-connected installed capacity of onshore wind power in central, eastern and southern my country will exceed 42 million kilowatts, and the cumulative grid-connected installed capacity will reach more than 70 million kilowatts.

[0003] In order to rationally develop and utilize wind energy in low wind speed areas and increase the wind-collecting capacity of wind turbines, it is necessary to further increase the diameter of the wind rotor and the height of the wind turbine tower. The economic height of a traditional pure steel tower is below 100 meters. Therefore, in order to obtain better economic benefits and safety performance, prefabricated prestressed hybrid towers have been widely used. The components of a prestressed hybrid tower can be simply divided into: a lower concrete tower (2), an upper steel tower (1) and an adapter ring (3), as shown in the attached figure. Figure 1 As shown. The adapter ring (3) is a transition member connecting the steel tower section and the concrete tower tube section. The top surface of the adapter ring (3) is provided with an annular upper anchor plate, and is tightly connected to the upper steel tower through hundreds of long screws running through the adapter ring (3) and the upper anchor plate (connection holes arranged at intervals along the circumference of the adapter ring (3), and the long screws pass through the connection holes and are tightly connected to the upper steel tower). The bottom is connected to the concrete tower tube through a grouting shear key, and finally, prestressed tendons are tensioned between the adapter ring (3) and the foundation to tightly press the adapter ring (3) onto the bottom concrete tower tube.

[0004] Therefore, as an important transition force transmission component, the adapter ring will generate huge stress inside and the local force is quite complicated under the combined effect of prestressed load, tower weight and external load. At present, the adapter ring adopts a reinforced concrete structure. In order to meet the force requirements, a considerable number of steel bars of different forms need to be configured inside. In the current production and construction of adapter rings, the upper anchor plate is usually cast directly on the adapter ring casting body, which has the following two shortcomings: first, the flatness of the anchor plate on the adapter ring does not meet the requirements; second, honeycomb and floating slurry appear at the junction of the bottom of the anchor plate on the adapter ring and the concrete.

[0005] In order to promote the construction and use of wind turbine steel-concrete hybrid towers in low wind speed areas, it is of great engineering value to study and propose new construction technologies to improve the construction and production of adapter rings. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention proposes a wind power hybrid tower adapter ring to improve the flatness of the anchor plate on the adapter ring and reduce the risk of honeycombed surface and laitance at the junction between the bottom of the upper anchor plate and concrete.

[0007] The wind power hybrid tower adapter ring of the present invention includes an adapter ring body, a secondary grouting groove is provided on the top surface of the adapter ring body, the secondary grouting groove is annular and concentrically arranged with the adapter ring body, a secondary casting body and an annular upper anchor plate are provided in the secondary grouting groove, and leveling bolts are respectively provided at the inner and outer circle edges of the upper anchor plate, the leveling bolts are evenly and spacedly arranged along the circumference of the upper anchor plate, the leveling bolts are used to level the upper anchor plate, and the upper anchor plate is cast and fixed on the adapter ring body through the secondary casting body, the adapter ring is provided with a connecting hole that passes through the adapter ring body and the upper anchor plate, and an anchor hole for inserting prestressed tendons, and the connecting hole and the anchor hole are respectively spacedly arranged along the circumference of the adapter ring body.

[0008] In one of the embodiments, the top of the secondary cast body protrudes from the top surface of the adapter ring body.

[0009] In one of the embodiments, inner and outer sides of the secondary grouting groove respectively exceed the inner and outer circle edges of the upper anchor plate, and the upper anchor plate is accommodated between the inner and outer sides of the secondary casting body.

[0010] In one of the embodiments, the number of the leveling bolts on the inner ring of the upper anchor plate is equal to the number of the leveling bolts on the outer ring of the upper anchor plate, and the leveling bolts are staggered along the circumference of the upper anchor plate.

[0011] In one of the embodiments, the connection holes are arranged between the inner and outer circles of the leveling bolts and are evenly arranged along the circumference of the adapter ring body.

[0012] In one of the embodiments, the adapter ring is further provided with a plurality of anchor plates, which correspond to the anchor holes respectively and are pre-buried on the top surface of the adapter ring body. Through holes for installing prestressed tendons are provided on the anchor plates respectively corresponding to the anchor holes.

[0013] The wind power hybrid tower adapter ring in the above technical solution has at least the following advantages:

[0014] (1) The upper anchor plate is leveled on the adapter ring body by leveling bolts, and then cast and fixed on the adapter ring body by the secondary casting body, which can effectively improve the flatness of the upper anchor plate on the adapter ring body. At the same time, the risk of honeycombing and laitance at the concrete joint between the upper anchor plate and the adapter ring body is reduced by casting and fixing the upper anchor plate by the secondary casting body.

[0015] (2) The top of the secondary cast body protrudes from the top surface of the adapter ring body, reducing the risk of rainwater intruding into the tower tube from the connection between the adapter ring and the steel tower tube.

[0016] (3) The inner and outer circles of leveling bolts are staggered to facilitate the flatness adjustment of the upper anchor plate and reduce the workload of the flatness adjustment of the upper anchor plate.

[0017] (4) The anchor pads are arranged corresponding to the anchor holes, which reduces the area of ​​a single anchor pad and reduces the risk of honeycombing and floating slurry when the anchor pad is cast on the adapter ring body.

[0018] With respect to the wind turbine hybrid tower adapter ring in the above technical solution, the present invention proposes a method for installing an anchor plate on the wind turbine hybrid tower adapter ring; so as to improve the flatness of the anchor plate on the adapter ring, while reducing the risk of honeycombed surface or floating slurry at the junction between the bottom of the upper anchor plate and the concrete.

[0019] To achieve the above-mentioned purpose, the method for installing the anchor plate on the wind power hybrid tower adapter ring provided by the present invention comprises the following steps:

[0020] S1: Base surface preparation and adapter ring leveling, select a flat ground or fill the ground, set it as a support platform, place the adapter ring on the support platform, and adjust the adapter ring to the bottom level;

[0021] S2: roughening the upper surface of the adapter ring, chiseling secondary grouting grooves along the inner and outer circles of the upper anchor plate corresponding to the installation position of the upper anchor plate, roughening the inner surface of the secondary grouting grooves, and cleaning the secondary grouting grooves;

[0022] S3: Install and level the upper anchor plate. Install multiple leveling bolts at intervals on the inner and outer circles of the upper anchor plate, then install the upper anchor plate into the secondary grouting groove, and use the leveling bolts to level the upper anchor plate. At the same time, select multiple connection holes at intervals along the circumference of the adapter ring, and install positioning screws in the selected installation holes to position and connect the upper anchor plate and the adapter ring; then insert and test-install the connection screws in the remaining connection holes to ensure that the connection screws can pass through each connection hole smoothly.

[0023] S4: Grouting pretreatment, extract each connection screw, and insert a leak-proof slurry pipe into each corresponding connection hole, and seal the connection between the leak-proof slurry pipe and the upper anchor plate; then replace each positioning screw with a positioning pipe, and seal the connection between the positioning pipe and the upper anchor plate; then paste sealing strips on the inner and outer sides of the upper anchor plate, and make the sealing strips fit tightly against the concrete surface to prevent slurry leakage;

[0024] S5: Grouting and curing: Select the fan precision grouting material for grouting, and perform construction pouring according to the requirements of the grouting material product. After pouring, maintain the adapter ring.

[0025] Furthermore, in step S4, before the positioning tube is inserted into the connecting hole, an isolating release agent is first applied to the outside of the positioning tube; in step S5, after the slurry is finally set, the positioning tube and the anti-leakage slurry tube are removed.

[0026] Furthermore, in step S2, before roughening the secondary grouting groove, the peeled, damaged and low-strength concrete is first removed, and after roughening, the floating slag and dust on the roughened surface are removed using a hair dryer.

[0027] Furthermore, in step S2, the roughening depth is 30 mm, and the roughening depth error is ±5 mm; the roughening width is increased by 25 mm to 30 mm on each side than the width of the upper anchor plate; the roughening area is close to the prestressed anchor plate on the top surface of the adapter ring, and the distance from the roughening area to the edge of the prestressed anchor plate is greater than or equal to 10 mm.

[0028] Furthermore, in step S3, when the leveling bolt is installed on the upper anchor plate, the top surface of the leveling bolt is leveled to the designed elevation using a laser level and a right-angle steel ruler; when the upper anchor plate is installed, the upper surface flatness of the upper anchor plate is adjusted to within 2 mm using a laser level, a right-angle steel ruler and a leveling bolt.

[0029] Furthermore, during the operation of step S4, after the anti-leakage slurry pipe and the positioning pipe are installed, secondary leveling is performed using the leveling bolts so that the maximum measured height difference flatness of the top surface of the upper anchor plate is less than or equal to 2 mm, and the bottom surface of the upper anchor plate is raised by 20 mm to 25 mm above the concrete elevation of the top of the adapter ring.

[0030] Furthermore, step S4 also includes pre-wetting the construction surface 24 hours before grouting and removing accumulated water 1 hour before grouting; in step S5, grouting is carried out in weather with a daily average temperature of not less than 5°C, and grouting is continuously carried out from one side of the secondary grouting groove until it overflows from the other side of the secondary grouting groove.

[0031] Furthermore, in step S5, after the grouting is completed, the adapter ring is cured in an environment where the average daily temperature should not be lower than 5°C; after the slurry is finally set, the slurry surface is covered with a curing blanket and kept moist, the slurry curing time is not less than 7 days, and the adapter ring is wrapped with a film to prevent rain, keep heat and retain moisture.

[0032] Furthermore, in step S3, when selecting the connection holes for installing the positioning screws, the connection holes are selected at equal intervals along the circumference of the adapter ring, and the number of the selected connection holes is 8 to 12.

[0033] Furthermore, in step S4, after the connecting screw is pulled out, the anti-leakage slurry pipe is inserted accordingly, and the connecting screw is pulled out and the anti-leakage slurry pipe is inserted in a diagonal, symmetrical and uniform order.

[0034] The method for installing the anchor plate on the wind power hybrid tower adapter ring of the present invention has at least the following advantages:

[0035] (1) The upper anchor plate is leveled by leveling bolts and fixed by positioning screws, which effectively ensures the flatness of the upper anchor plate before grouting. The connection screws are replaced by anti-leakage grouting pipes and the positioning screws are replaced by positioning pipes, and then secondary leveling is performed to further ensure the flatness of the upper anchor plate before grouting, reducing the risk of increased flatness error of the upper anchor plate before grouting, thereby improving the flatness of the anchor plate on the adapter ring; at the same time, it ensures that the connection holes on the upper anchor plate and the adapter ring body can be aligned. The upper and lower ends of the adapter ring can be aligned to connect the steel tower and the concrete tower, which is easy to install.

[0036] (2) The connection between the leakage pipe and the positioning pipe and the upper anchor plate is sealed to avoid leakage during filling, so that the grouting material can fill the upper anchor plate and the secondary grouting groove, reducing the risk of honeycomb or floating slurry at the junction of the bottom of the upper anchor plate and the concrete.

[0037] (3) Control the temperature and time of grouting and curing to ensure that the slurry solidifies stably and avoid the formation of honeycombs or floating slurry during the solidification process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0039] Figure 1 It is a structural schematic diagram of a prestressed hybrid tower;

[0040] Figure 2 A schematic diagram of the three-dimensional structure of a wind power hybrid tower adapter ring provided by an embodiment of the present invention;

[0041] Figure 3 for Figure 2 A top view of the wind power hybrid tower adapter ring is shown;

[0042] Figure 4 for Figure 2 The schematic diagram of the partial structure of the wind power hybrid tower adapter ring connected to the steel tower and the concrete tower shown;

[0043] Figure 5 It is a partial schematic diagram of performing secondary grouting of the adapter ring by using the method for installing the anchor plate on the adapter ring of the wind power hybrid tower of the present invention;

[0044] Figure 6 It is a schematic diagram of the cross-sectional structure of performing secondary grouting of the adapter ring by using the method for installing the anchor plate on the adapter ring of the wind power hybrid tower of the present invention;

[0045] Figure 7 A schematic diagram of the sequence of the connecting screw being pulled out and the anti-leakage slurry pipe being inserted;

[0046] Reference numerals:

[0047] 1-steel tower, 2-concrete tower, 3-adapter ring, 31-adapter ring body, 311-secondary grouting groove, 32-secondary casting body, 33-upper anchor plate, 331-leveling screw hole, 332-leveling bolt, 34-connecting hole, 35-anchor hole, 36-anchor pad, 4-prestressed tendon, 51-support platform, 52-leveling bolt, 53-positioning screw, 54-connecting screw. DETAILED DESCRIPTION

[0048] The embodiments of the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and the protection scope of the present invention cannot be limited thereto. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by those skilled in the art to which the present invention belongs.

[0049] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Embodiment 1

[0051] See also Figures 2 to 4 In one embodiment, a wind turbine hybrid tower adapter ring includes an adapter ring body 31, on which a secondary grouting groove 311 is provided, in which a secondary casting body 32 and an upper anchor plate 33 are provided, which can improve the flatness of the anchor plate on the adapter ring and reduce the risk of honeycombed surface and floating slurry at the junction of the bottom of the upper anchor plate and concrete.

[0052] Specifically, a secondary grouting groove 311 is provided on the top surface of the adapter ring body 31. The secondary grouting groove 311 is annular and is arranged concentrically with the adapter ring body 31. The adapter ring body 31 adopts a reinforced concrete structure, and the specific steel bar arrangement can refer to the adapter ring or concrete tower in the prior art. The secondary grouting groove 311 can be reserved when the adapter ring body 31 is cast or excavated after casting.

[0053] A secondary cast body 32 and an annular upper anchor plate 33 are provided in the secondary grouting groove 311. Leveling bolts 332 are provided at the inner and outer edges of the upper anchor plate 33. The leveling bolts 332 are evenly and spacedly arranged along the circumference of the upper anchor plate 33, and the leveling bolts 332 are used to level the upper anchor plate 33. The upper anchor plate 33 is cast and fixed on the adapter ring body 31 through the secondary cast body 32. Specifically, the upper anchor plate 33 is cast and fixed on the top of the adapter ring body 31 by using Sika or BASF fatigue-certified onshore wind turbine precision grouting materials. The secondary cast slurry is the secondary cast body 32. The upper anchor plate 33 is leveled on the adapter ring body 31 by the leveling bolts 332, and then cast and fixed on the adapter ring body 31 by the secondary casting body 32, which can effectively improve the flatness of the upper anchor plate 33 on the adapter ring body 31. At the same time, the risk of honeycomb and floating slurry appearing at the concrete joint between the upper anchor plate 33 and the adapter ring body 31 by casting and fixing the upper anchor plate 33 by the secondary casting body 32 is reduced. In one embodiment, in order to facilitate the adjustment of the flatness of the upper anchor plate 33, the number of the leveling bolts 332 on the inner circle of the upper anchor plate 33 is equal to the number of the leveling bolts 332 on the outer circle of the upper anchor plate 33, and they are staggered along the circumference of the upper anchor plate 33. Specifically, two circles of leveling screw holes 331 are provided on the upper anchor plate 33, and the leveling screw holes 331 are respectively arranged at the inner and outer edges of the upper anchor plate 33, and are arranged at intervals along the circumference of the upper anchor plate 3. The leveling bolts 332 are screwed and installed in the leveling screw holes 331. The inner and outer circles of leveling bolts 332 are arranged alternately, which is convenient for adjusting the flatness of the upper anchor plate 33 and reduces the workload of adjusting the flatness of the upper anchor plate 33 .

[0054] In one embodiment, the top of the secondary cast body 32 protrudes from the top surface of the adapter ring body 31. After the tower is installed, the secondary cast body 32 blocks rainwater on the top surface of the adapter ring body 31, reducing the risk of rainwater invading the tower from the connection between the adapter ring 3 and the steel tower 1. Specifically, the inner and outer sides of the secondary grouting groove 311 exceed the inner and outer circle edges of the upper anchor plate 33 respectively, and the upper anchor plate 33 is accommodated between the inner and outer sides of the secondary cast body 32. While preventing rainwater from invading, the secondary cast body 32 firmly fixes the upper anchor plate 33 on the adapter ring body 31.

[0055] The adapter ring 3 is provided with a connection hole 34 that passes through the adapter ring body 31 and the upper anchor plate 33, and an anchor hole 35 for inserting the prestressed tendon 4. The connection hole 34 and the anchor hole 35 are respectively arranged at intervals along the circumference of the adapter ring body 31. Specifically, the connection hole 34 is arranged between the inner and outer circles of the leveling bolts 332, and is evenly arranged along the circumference of the adapter ring body 31. It can be understood that when the secondary casting body 32 is grouting, it is necessary to insert a leak-proof slurry pipe in the connection hole 34. The connection hole 34 is arranged between the two circles of the leveling bolts 332, which can reduce the influence of the flatness of the upper anchor plate 33 when the leak-proof slurry pipe is inserted.

[0056] In one embodiment, the adapter ring 3 is further provided with a plurality of anchor pads 36, which correspond to the anchor holes 35, respectively, and are pre-buried on the top surface of the adapter ring body 31. The anchor pads 36 are respectively provided with through holes corresponding to the anchor holes 35 for installing the prestressed tendons 4. The anchor pads 36 are respectively provided corresponding to the anchor holes 35, which reduces the area of ​​a single anchor pad 36, reduces the risk of honeycombing and laitance when the anchor pads 36 are cast on the adapter ring body 31, and improves the overall production quality of the adapter ring 3.

[0057] According to the wind power hybrid tower adapter ring in the above technical solution, the upper anchor plate 33 is leveled on the adapter ring body 31 by the leveling bolts 332, and then cast and fixed on the adapter ring body 31 by the secondary casting body 32, which can effectively improve the flatness of the upper anchor plate 33 on the adapter ring body 31. At the same time, the risk of honeycomb and floating slurry appearing at the concrete joint between the upper anchor plate 33 and the adapter ring body 31 is reduced by casting and fixing the upper anchor plate 33 by the secondary casting body 32. It has good applicability and is easy to produce, and is worthy of popularization and use.

[0058] Embodiment 2

[0059] See also Figures 1 to 7 The present invention provides a method for installing an anchor plate on a wind power hybrid tower adapter ring; to improve the flatness of the upper anchor plate 33 of the adapter ring 3, while reducing the risk of honeycomb or slurry appearing at the junction of the bottom of the upper anchor plate 33 and the concrete.

[0060] Specifically, the structure of the adapter ring 3 can be referred to Figures 5 to 7 , the adapter ring 3 includes an adapter ring body 31 and an upper anchor plate 33. The adapter ring body 31 is a reinforced concrete structure, and the upper anchor plate 33 is annular. The upper anchor plate 33 is arranged on the top surface of the adapter ring body 31. The adapter ring 3 is provided with connection holes 34. The connection holes 34 are arranged at intervals along the circumference of the adapter ring body 31. The method for installing the anchor plate on the wind power hybrid tower adapter ring in one embodiment includes the following steps:

[0061] S1, base surface preparation and leveling of adapter ring 3. Please refer to Figures 5 to 7 , select a flat ground or fill the ground, set it as a support platform 51. Place the adapter ring 3 on the support platform 51, and adjust the adapter ring 3 to the bottom level. In a specific implementation, a flat ground or a ground filled with stone or construction waste is selected as the support platform 51. When leveling, a steel pad or pre-assembly is used for rough leveling. Use a laser level and an ABS leveling pad to adjust the adapter ring 3 to the bottom level.

[0062] S2, roughening the upper surface of the adapter ring 3. A secondary grouting groove 311 is chiseled along the inner and outer circles of the upper anchor plate 33 corresponding to the installation position of the upper anchor plate 33. The inner surface of the secondary grouting groove 311 is roughened, and the secondary grouting groove 311 is cleaned. The upper anchor plate 33 is an annular structure, and the secondary grouting groove 311 is correspondingly set to a ring shape. In a specific embodiment, an electric pick is used to chisel the secondary grouting groove 311 along the inner and outer circles of the upper anchor plate 33. Before roughening the secondary grouting groove 311, the peeled, damaged and low-strength concrete is first removed. After roughening, a hair dryer is used to remove the floating slag and dust on the roughened surface. Specifically, the roughening depth is 30mm, and the roughening depth error is ±5mm. The roughening width is 25mm to 30mm larger than the width of the upper anchor plate 33 on each side. The roughening area is close to the prestressed anchor pad 55 on the top surface of the adapter ring 3, and the distance from the roughening area to the edge of the prestressed anchor pad 55 is greater than or equal to 10mm. It should be noted that when roughening different areas, the roughening depth can also be set as the target depth by exposing the coarse aggregate in the concrete.

[0063] S3, installation and leveling of the upper anchor plate 33. Multiple leveling bolts 332 are installed at intervals on the inner and outer circles of the upper anchor plate 33. Then the upper anchor plate 33 is installed in the secondary grouting groove 311, and the upper anchor plate 33 is leveled by the leveling bolts 332. At the same time, multiple connection holes 34 are selected along the circumferential intervals of the adapter ring 3, and positioning screws 53 are installed in the selected installation holes to position and connect the upper anchor plate 33 with the adapter ring 3. Then the connecting screws 54 are respectively inserted and tested in the remaining connection holes 34 to ensure that the connecting screws 54 can pass through each connection hole 34 smoothly. When the connecting screws 54 can pass through each connection hole 34 smoothly, it means that the upper anchor plate 33 and the adapter ring 3 are accurately positioned. Ensure that the adapter ring 3 can be installed normally in the later stage. In a specific embodiment, when the leveling bolts 332 are installed on the upper anchor plate 33, the top surface of the leveling bolts 332 is leveled to the design elevation using a laser level and a right-angle steel ruler. That is, after the upper anchor plate 33 is installed, the theoretical position of the leveling bolt 332 on the upper anchor plate 33 is adjusted. In order to facilitate leveling, a leveling height of about 3 mm can be reserved during specific implementation. To facilitate subsequent leveling. When the upper anchor plate 33 is installed, the upper surface flatness of the upper anchor plate 33 is adjusted to within 2 mm using a laser level, a right-angle steel ruler and a leveling bolt 332. The upper anchor plate 33 is leveled before trial installation of the connecting screw 54 to ensure the flatness of the upper anchor plate 33 in subsequent steps. In a specific embodiment, when selecting the connecting holes 34 for installing the positioning screw 53, the connecting holes 34 are selected at equal intervals along the circumference of the adapter ring 3, and the number of connecting holes 34 selected is 8 to 12. Specifically, the selected connecting holes 34 are evenly arranged along the circumference of the adapter ring 3. The forces acting on the positioning screw 53 are oppositely balanced, making the positioning of the upper anchor plate 33 more accurate and stable.

[0064] S4, grouting pretreatment. Pull out each connecting screw 54, and insert the anti-leakage grout pipe into each corresponding connecting hole 34, and seal the connection between the anti-leakage grout pipe and the upper anchor plate 33. Then replace each positioning screw 53 with a positioning pipe, and seal the connection between the positioning pipe and the upper anchor plate 33. Then paste sealing strips on the inner and outer sides of the upper anchor plate 33, and make the sealing strips close to the concrete surface to prevent leakage. The connection between the leakage grout pipe and the positioning pipe and the upper anchor plate 33 is sealed to avoid leakage during filling, so that the grouting material can fill the upper anchor plate 33 and the secondary grouting groove 311, and reduce the risk of honeycomb or floating slurry at the junction of the bottom of the upper anchor plate 33 and the concrete. In the first implementation process, after the anti-leakage grout pipe and the positioning pipe are installed, the leveling bolt 332 is used for secondary leveling, so that the maximum measured height difference flatness of the top surface of the upper anchor plate 33 is less than or equal to 2mm, and the bottom surface of the upper anchor plate 33 is raised by 20mm to 25mm higher than the concrete elevation of the top of the adapter ring 3. This further ensures the flatness of the upper anchor plate 33 before grouting, thereby ensuring the flatness after installation. At the same time, ensure that there is a suitable gap between the bottom surface of the upper anchor plate 33 and the secondary grouting groove 311 to facilitate grouting, and at the same time, the slurry has sufficient strength after solidification. The upper anchor plate 33 is leveled by the leveling bolts 332 and fixed by the positioning screws 53, which effectively ensures the flatness of the upper anchor plate 33 before grouting. The connecting screws 54 are replaced by the anti-leakage grouting pipe, and the positioning screws 53 are replaced by the positioning pipe, and then secondary leveling is performed to further ensure the flatness of the upper anchor plate 33 before grouting, reducing the risk of increased flatness error of the upper anchor plate 33 before grouting, thereby improving the flatness of the anchor plate 33 on the adapter ring 3. Please refer to Figure 7 In a specific embodiment, after the connecting screw 54 is pulled out, the corresponding anti-leakage slurry pipe is inserted. The connecting screw 54 is pulled out and the anti-leakage slurry pipe is inserted in a diagonal, symmetrical and uniform order. Thereby reducing the risk of the position change of the upper anchor plate 33 when the anti-leakage slurry pipe is installed. The anti-leakage slurry pipe adopts a PVC pipe, and the positioning pipe adopts a steel pipe. Preferably, when the connecting screw 54 is pulled out, it is also preferred to pull out the connecting screw 54 away from the positioning screw 53. Make the adapter ring 3 more stable during the process of pulling out the connecting screw 54 and inserting the anti-leakage slurry pipe. Ensure that the parts of the connecting hole 34 on the upper anchor plate 33 and the adapter ring body 31 can be aligned. The upper and lower ends of the adapter ring 3 can be aligned to connect the steel tower 1 and the concrete tower 2.

[0065] S5, grouting and curing. Select precision grouting materials for wind turbines for grouting, and perform construction pouring according to the requirements of the grouting material products. After pouring, the adapter ring 3 is cured. Specifically, the precision grouting materials for onshore wind turbines certified by Sika or BASF are selected for grouting. Pre-moisten the construction surface 24 hours before grouting, and remove the accumulated water 1 hour before grouting. During the specific implementation, observe the construction surface to ensure that the construction surface is completely absorbed and moist, the surface color is dark, and the concrete surface is moist, non-reflective, and without visible water. Grouting is selected in weather with an average daily temperature of not less than 5°C, and grouting is continuously performed from one side of the secondary grouting groove 311 until it overflows from the other side of the secondary grouting groove 311. When grouting, the grouting time should be shortened as much as possible. Vibration is prohibited during the grouting process. A grouting booster can be used to push the grouting material along the bottom of the slurry flow direction. It is strictly forbidden to push from the middle and upper parts of the grouting layer. After grouting, the adapter ring 3 is cured in an environment where the average daily temperature should not be lower than 5°C. After the slurry is finally set, the surface of the slurry is covered with a curing blanket and kept moist. The curing time of the slurry is not less than 7 days, and the adapter ring 3 is wrapped with a film to prevent rain, keep warm and moisturize. The temperature and time of grouting and curing are controlled to stably solidify the slurry and avoid honeycomb or floating slurry during the solidification process. In a specific embodiment, in order to verify the strength of the grouting material, 2 groups of grouting test pieces with the same conditions and 3 groups of 28-day test pieces are made during grouting. In a specific embodiment, the following steps are also included: before the positioning tube is inserted into the connecting hole 34, an isolation release agent is first applied to the outside of the positioning tube. After the slurry 33 is finally set, the fixed tube and the anti-leakage slurry tube are removed. To ensure the size of the original connecting hole 34 of the adapter ring 3, the adapter ring 3 is convenient for installation and connection with the steel tower 1 and the concrete tower 2.

[0066] According to the method for installing the anchor plate on the wind power hybrid tower adapter ring in the above technical solution, the upper anchor plate 33 is leveled by the leveling bolt 332 and fixed by the positioning screw 53, which effectively ensures the flatness of the upper anchor plate 33 before grouting, and then the connection screw 54 is replaced by the anti-leakage grouting pipe, and the positioning screw 53 is replaced by the positioning pipe, and then a secondary leveling is performed to further ensure the flatness of the upper anchor plate 33 before grouting, reducing the risk of increased flatness error of the upper anchor plate 33 before grouting, thereby improving the flatness of the anchor plate 33 on the adapter ring 3. The connection between the leakage grouting pipe and the positioning pipe and the upper anchor plate 33 is sealed to avoid leakage during filling, so that the grouting material can fill the upper anchor plate 33 and the secondary grouting groove 311, reducing the risk of honeycomb surface or floating slurry at the junction of the bottom of the upper anchor plate 33 and the concrete.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for installing an anchor plate on a wind power hybrid tower adapter ring, characterized in that: It comprises an adapter ring body, a secondary grouting groove is provided on the top surface of the adapter ring body, the secondary grouting groove is annular and is arranged concentrically with the adapter ring body, a secondary casting body and an annular upper anchor plate are arranged in the secondary grouting groove, and leveling bolts are respectively provided at the inner and outer ring edges of the upper anchor plate, the leveling bolts are evenly and spacedly arranged along the circumference of the upper anchor plate, the leveling bolts are used to level the upper anchor plate, the upper anchor plate is cast and fixed on the adapter ring body through the secondary casting body, the adapter ring is provided with a connecting hole that passes through the adapter ring body and the upper anchor plate, and an anchor hole for inserting prestressed tendons, and the connecting hole and the anchor hole are respectively spacedly arranged along the circumference of the adapter ring body; The method comprises: S1: Base surface preparation and adapter ring leveling, select a flat ground or fill the ground, set it as a support platform, place the adapter ring on the support platform, and adjust the adapter ring to the bottom level; S2: roughening the upper surface of the adapter ring, chiseling secondary grouting grooves along the inner and outer circles of the upper anchor plate corresponding to the installation position of the upper anchor plate, roughening the inner surface of the secondary grouting grooves, and cleaning the secondary grouting grooves; S3: Install and level the upper anchor plate. Install multiple leveling bolts at intervals on the inner and outer circles of the upper anchor plate, then install the upper anchor plate into the secondary grouting groove, and use the leveling bolts to level the upper anchor plate. At the same time, select multiple connection holes at intervals along the circumference of the adapter ring, and install positioning screws in the selected installation holes to position and connect the upper anchor plate and the adapter ring; then insert and test-install the connection screws in the remaining connection holes to ensure that the connection screws can pass through each connection hole smoothly. S4: Grouting pretreatment, extract each connection screw, and insert a leak-proof slurry pipe into each corresponding connection hole, and seal the connection between the leak-proof slurry pipe and the upper anchor plate; then replace each positioning screw with a positioning pipe, and seal the connection between the positioning pipe and the upper anchor plate; then paste sealing strips on the inner and outer sides of the upper anchor plate, and make the sealing strips fit tightly against the concrete surface to prevent slurry leakage; S5: Grouting and curing: Select the fan precision grouting material for grouting, and perform construction pouring according to the requirements of the grouting material product. After pouring, maintain the adapter ring.

2. The method for installing an anchor plate on a wind power hybrid tower adapter ring according to claim 1, characterized in that: In step S2, before roughening the secondary grouting groove, the peeled, damaged and low-strength concrete is first removed, and after roughening, the floating slag and dust on the roughened surface are removed using a hair dryer.

3. The method for installing an anchor plate on a wind power hybrid tower adapter ring according to claim 2, characterized in that: In step S2, the roughening depth is 30mm, and the roughening depth error is ±5mm; the roughening width is 25mm~30mm larger than the width of the upper anchor plate on each side; the roughening area is close to the prestressed anchor plate on the top surface of the adapter ring, and the distance from the roughening area to the edge of the prestressed anchor plate is greater than or equal to 10mm.

4. The method for installing an anchor plate on a wind power hybrid tower adapter ring according to claim 1, characterized in that: In step S3, when the leveling bolt is installed on the upper anchor plate, the top surface of the leveling bolt is leveled to the designed elevation using a laser level and a right-angle steel ruler; when the upper anchor plate is installed, the upper surface flatness of the upper anchor plate is adjusted to within 2 mm using a laser level, a right-angle steel ruler and a leveling bolt.

5. The method for installing an anchor plate on a wind power hybrid tower adapter ring according to claim 4, characterized in that: During the operation of step S4, after the anti-leakage slurry pipe and the positioning pipe are installed, secondary leveling is performed using the leveling bolts so that the maximum measured height difference flatness of the top surface of the upper anchor plate is less than or equal to 2 mm, and the bottom surface of the upper anchor plate is raised 20 mm to 25 mm higher than the concrete elevation of the top of the adapter ring.

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