A tooling and assembly method for assembling and adjusting sections of a large-diameter tower.

Abstract

This invention discloses a large-diameter tower section assembly and adjustment fixture, comprising: a central body with at least four connecting rods arranged circumferentially; a connecting main beam detachably connected to the connecting rods, with multiple positioning holes on its upper surface; support legs fixed to the connecting main beam by a fixing device; and positioning pins disposed adjacent to the sections at the intersections with the multiple connecting main beams, detachably connected to the positioning holes. The central body, connecting main beam, support legs, and positioning pins are all detachable, resulting in a simple structure, convenient installation, and low equipment transportation requirements, thus reducing the intensity of pre-installation preparation work for the tower. During the assembly of the tower sections, positioning is achieved through the positioning pins, eliminating the need for additional positioning equipment, significantly reducing the difficulty for operators and improving work efficiency. The four sections can be assembled after being placed in preset positions on the connecting main beam, demonstrating promising application prospects and a wide range of applicability.

Description

Technical Field

[0001] This invention relates to the field of wind power hoisting equipment, and in particular to a tooling and method for assembling and adjusting large-diameter tower sections. Background Technology

[0002] New energy is a direction that the country is currently vigorously developing. Among them, wind power is the lowest-cost and most promising form of new energy with the greatest potential for large-scale development.

[0003] With the continuous development of the wind power industry, the power of wind turbines in wind power generation equipment is constantly increasing, and the diameter of the tower is also increasing. Traditional transportation and hoisting equipment can no longer meet the requirements of large-diameter towers. Therefore, existing technology divides large-diameter towers longitudinally into four sections, which are then assembled after being transported to the site. Commonly used assembly equipment has the following drawbacks:

[0004] 1. The equipment is complex and difficult to operate, resulting in high labor intensity for operators and low overall work efficiency.

[0005] 2. It is difficult to test the levelness of the assembled equipment, and the levelness adjustment is inconvenient.

[0006] 3. When the tower is assembled by the assembly equipment, the four sections need to be spliced ​​into a whole tower. If the diameter of the assembled tower is not compatible with the equipment or the tower has defects, the tower cannot complete the final splicing step by the assembly equipment, and the applicability of the equipment is poor.

[0007] In view of this, how to provide a large-diameter tower assembly tooling that can solve all or part of the above-mentioned defects is a technical problem that urgently needs to be solved by those in the art. Summary of the Invention

[0008] The purpose of this invention is to provide a tooling and assembly method for assembling and adjusting large-diameter tower sections, so as to solve the problems existing in the prior art, simplify the operation for operators, improve work efficiency and reduce labor intensity.

[0009] To achieve the above objectives, the present invention provides the following solution: The present invention provides a large-diameter tower section assembly and adjustment fixture, the tower comprising four longitudinally segmented, connectable sections, including:

[0010] A central body, wherein at least four connecting rods are arranged circumferentially on the central body;

[0011] A connecting main beam is provided, which corresponds to and is detachably connected to the connecting rod. The upper surface of the connecting main beam is provided with multiple positioning holes.

[0012] The supporting leg has mounting holes through the upper and lower surfaces of the connecting main beam. The supporting leg passes through the mounting holes from bottom to top and is fixed to the connecting main beam by a fixing device.

[0013] The positioning pins are multiple in number, each of which is located between at least two adjacent connecting main beams and placed on the upper surface of the connecting main beams. The positioning pins are adjacent to each other at the intersection of the portion and the multiple connecting main beams, and the positioning pins are detachably connected to the positioning holes.

[0014] The beneficial effects of this invention are:

[0015] The equipment is simple in structure, easy to install, and has low requirements for transportation, which reduces the intensity of preparation work before tower installation. During the assembly of the tower sections, positioning is achieved by positioning pins, eliminating the need for additional positioning equipment, which greatly reduces the difficulty of the operation and improves work efficiency. The four sections can be spliced ​​after being placed in the preset positions on the connecting main beam. It has good application prospects and a wide range of applications.

[0016] Preferably, there are eight connecting rods, which are evenly spaced apart.

[0017] When disassembling the tower, it is generally divided into four evenly distributed sections. The advantage of setting the connecting rods in the above manner is that the four sections can be arranged regularly and symmetrically in the equipment, resulting in better stability and allowing operators to quickly and accurately locate the preset positions of the sections. In addition, each section not only has its ends placed on the connecting main beam, but its middle position can also be placed on a connecting main beam. This provides a central support point for the section, enhancing its stability, and the positioning pins near the intersection of the section's middle and the connecting main beam can further assist in positioning, making it easier for operators to install and position the section more quickly and accurately.

[0018] Furthermore, the fixing device is a fixing bolt, the outer surface of the support leg is provided with threads, the fixing bolt is threadedly connected to the support leg and fixes it to the connecting main beam.

[0019] Furthermore, it also includes connecting shafts, at least two of which are provided. The connecting main beam has a first through hole corresponding to the connecting shaft, and the connecting rod has a second through hole corresponding to the connecting shaft. The connecting shaft passes through the first through hole and the second through hole in sequence.

[0020] The function of the connecting shaft is to prevent relative displacement between the connecting rod and the connecting main beam in the vertical direction. Compared with the connecting bolts and connecting flanges, the connecting shaft can directly avoid the safety hazards caused by insufficient bolt strength and insufficient bolt preload. The purpose of setting two or more connecting shafts is to prevent relative rotation between the connecting rod and the connecting main beam.

[0021] Furthermore, it also includes a first electric hydraulic jack, a laser leveling instrument, and a controller. The bottom surface of the first electric hydraulic jack is flush with the bottom surface of the support leg, and its output end abuts against the lower surface of the connecting main beam. The laser leveling instrument is disposed on the upper surface of the connecting main beam, and the controller is communicatively connected to the first electric hydraulic jack and the laser leveling instrument.

[0022] Generally, the main beam connected to the support legs should be level after installation, which is a necessary condition for the subsequent tower installation. Therefore, the levelness of the main beam needs to be checked before tower installation, and adjustments need to be made if the levelness is insufficient. In this application, a laser leveling instrument combined with an electro-hydraulic jack is used. When the levelness is insufficient, the controller can control the first electro-hydraulic jack to fine-tune the levelness of the main beam until it is level, providing a safety guarantee for tower installation.

[0023] Furthermore, it also includes a sliding support and a second electro-hydraulic jack. The upper surface of the connecting main beam has an adjustment hole at a position away from the connecting rod. The sliding support is fixedly connected to the adjustment hole. The second electro-hydraulic jack is fixedly connected to the sliding support. The second electro-hydraulic jack is located between the section and the sliding support, and the output end of the second electro-hydraulic jack faces the section.

[0024] Normally, the tower sections can be spliced ​​after being installed onto the connecting main beam. However, when the tower diameter does not match the equipment or the tower has defects, external force is required to assist in the splicing of the sections. In this application, each section corresponds to a second electro-hydraulic jack. Each section can be pushed simultaneously by the second electro-hydraulic jack or pushed independently, ultimately achieving splicing and improving the applicability of the equipment.

[0025] The present invention also provides a method for assembling large-diameter tower sections, comprising:

[0026] S1: Connect and fix the connecting rod of the central body to the connecting main beam;

[0027] S2: The support leg is fixed to the connecting main beam by a fixing device. The bottom of the support leg is set on the ground and the top passes through the mounting hole of the connecting main beam. After the support leg is installed, the central body and the connecting main beam are set in a horizontal state.

[0028] S3: Insert a positioning pin into the positioning hole of the main beam to position one of the four sections;

[0029] S4: Place the corresponding part in S3 on the connecting main beam and fit it tightly with the positioning pin in S3. After the position of the part is determined, remove all the positioning pins inserted into the positioning holes in S3.

[0030] S5: Repeat steps S3 and S4 until the positions of the four parts are determined and the four parts are placed after the connecting main beam can be spliced.

[0031] The beneficial effects of this invention are:

[0032] During the assembly of the tower sections, positioning pins are used for positioning, eliminating the need for additional positioning equipment. This greatly reduces the difficulty of the work for operators and improves work efficiency. The four sections can be spliced ​​after being placed in the preset positions on the connecting main beam. In addition, the positioning pins can be completely removed after positioning, allowing for reuse and avoiding any impact on the positioning of other sections. It has good application prospects and a wide range of applications.

[0033] Furthermore, step S201 is included: after step S2 is completed, the first electric hydraulic jack is installed below the connecting main beam, with its bottom set on the ground and its output end abutting against the connecting main beam. The laser leveling instrument is activated to detect the levelness of the connecting main beam. When the laser leveling instrument detects that the levelness of the connecting main beam is higher than a predetermined value, the laser leveling instrument sends a signal and a deviation value to the controller. After receiving the signal, the controller controls the travel distance of the first electric hydraulic jack according to the deviation value until the levelness of the connecting main beam reaches the predetermined value. Then, the supporting leg is fixed to the connecting main beam again by the fixing device.

[0034] Before tower installation, the levelness of the connecting main beam needs to be checked, and adjustments must be made if the levelness is insufficient. This application uses a laser leveling instrument combined with an electro-hydraulic jack. When the levelness is insufficient, the controller can control the first electro-hydraulic jack to fine-tune the levelness of the connecting main beam until it is level, thus providing a safety guarantee for tower installation.

[0035] Preferably, the predetermined value of the horizontality of the signal emitted by the laser leveling instrument is 1 mm / m.

[0036] Furthermore, step S6 is also included: when the four parts cannot be properly spliced ​​after step S5, the sliding support is fixed on the adjustment hole of the connecting main beam, the second electric hydraulic jack is fixed to the sliding support, and the output end of the second electric hydraulic jack is adjusted to the position of abutting against the parts. Each of the four parts corresponds to one second electric hydraulic jack, and the four parts can be pushed and spliced ​​by the second electric hydraulic jack.

[0037] Each section corresponds to a second electro-hydraulic jack. Each section can be pushed simultaneously by the second electro-hydraulic jack or pushed independently, ultimately achieving splicing. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 Top view of the overall structure of the assembly and adjustment tooling;

[0040] Figure 2 This is an enlarged schematic diagram of the sliding support component and the electro-hydraulic jack structure.

[0041] Figure 3 This is a schematic diagram of the main beam structure.

[0042] Figure 4 To assemble and adjust the overall structure of the tooling, front view;

[0043] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0044] Figure 6 This is a schematic diagram of the component installation;

[0045] Figure 7 This is a control principle diagram of an electric hydraulic jack.

[0046] Among them, 1-section, 2-central body, 201-connecting rod, 3-connecting main beam, 301-positioning hole, 302-adjusting hole, 4-support leg, 5-fixing device, 6-connecting shaft, 7-electric hydraulic jack, 8-laser leveling instrument, 9-sliding support component. Detailed Implementation

[0047] 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, and 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.

[0048] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Reference Figure 1-7 This invention provides a large-diameter tower section assembly and adjustment fixture. The tower includes four longitudinally segmented, connectable sections 1, each comprising: a central body 2, with at least four connecting rods 201 arranged circumferentially, the central body 2 and the connecting rods 201 being integrally formed; a connecting main beam 3, corresponding to and detachably connected to the connecting rods 201, the upper surface of the connecting main beam 3 having multiple positioning holes 301; a support leg 4, the connecting main beam 3 having mounting holes extending through its upper and lower surfaces, the support leg 4 passing through the mounting holes from bottom to top and being fixed to the connecting main beam 3 by a fixing device 5; and multiple positioning pins, each section 1 located between at least two adjacent connecting main beams 3 and placed on the upper surface of the connecting main beam 3, the positioning pins being adjacently arranged at the intersections of section 1 and multiple connecting main beams 3, the positioning pins being detachably connected to the positioning holes 301.

[0050] In this embodiment, the fixing device 5 is a fixing bolt, and the outer surface of the support leg 4 is threaded. The fixing bolt is threadedly connected to the support leg 4 and fixes it to the connecting main beam 3. The support leg 4 is not only located below the connecting main beam 3, but also below the central body 2. The support leg 4 corresponding to the central body 2 does not need to penetrate the central body 2 because the height of the central body 2 does not need to be adjusted; therefore, its height is fixed. The lower support leg 4 naturally does not need to penetrate the central body 2, and this support leg 4 can also be fixed to the central body 2 by the fixing bolt. There are eight connecting rods 201, which are evenly spaced. In some other embodiments, the number of connecting rods 201 can be set to an integer multiple of 4, which can make the stress on the section 1 more uniform and the structure more stable. If the tower is divided into 3 sections, 5 sections, etc., the number of connecting rods 201 can be flexibly adjusted according to the number of tower sections 1.

[0051] In this embodiment, there are two connecting shafts 6. The connecting main beam 3 has a first through hole corresponding to the connecting shaft 6, and the connecting rod 201 has a second through hole corresponding to the connecting shaft 6. The connecting shaft 6 passes through the first through hole and the second through hole in sequence. After the connecting shaft 6 is inserted, it can be fixed to the connecting main beam 3 and the connecting rod 201 by a nut. Alternatively, a through hole can be pre-drilled on the connecting shaft 6, and a spring pin can be inserted into the through hole after the connecting shaft 6 is inserted to lock the connecting shaft 6.

[0052] In this embodiment, the system also includes a first electro-hydraulic jack, a laser leveling instrument 8, and a controller. The bottom surface of the first electro-hydraulic jack is flush with the bottom surface of the support leg 4, and its output end abuts against the lower surface of the connecting main beam 3. The laser leveling instrument 8 is disposed on the upper surface of the connecting main beam 3. The controller is communicatively connected to the first electro-hydraulic jack and the laser leveling instrument 8. The system also includes a sliding support 9 and a second electro-hydraulic jack. An adjustment hole 302 is provided on the upper surface of the connecting main beam 3 at a position away from the connecting rod 201. The sliding support 9 is fixedly connected to the adjustment hole 302. The second electro-hydraulic jack is fixedly connected to the sliding support 9 (the position where the sliding support 9 and the second electro-hydraulic jack are fixedly connected can be provided with a mounting base, mounting platform, snap-fit, or other structures for quick disassembly and installation of the second electro-hydraulic jack). The second electro-hydraulic jack is located between the section 1 and the sliding support 9, and the output end of the second electro-hydraulic jack faces the section 1. Since the first and second electric hydraulic jacks will not be used simultaneously, this embodiment uses the same electric hydraulic jack 7 to perform the corresponding operations (hereinafter collectively referred to as electric hydraulic jack 7).

[0053] In this embodiment, the sliding support 9 has a fixing hole, and the sliding support 9 is fixed to the connecting main beam 3 by means of fastening bolts that are threaded into the fixing hole and the adjusting hole 302 in sequence. The adjusting hole 302 can be designed to be the same size as the positioning hole 301, which can expand the range of positions where the sliding support 9 can be installed, and also facilitates processing during the production of the connecting main beam 3.

[0054] The specific work process is as follows:

[0055] S1: Connect and fix the connecting rod 201 of the central body 2 to the connecting main beam 3.

[0056] S2: Fix the support leg 4 to the connecting main beam 3 and the central body 2 with fixing bolts. The support leg 4 below the central body 2 is fixed to the lower surface of the central body 2 with fixing bolts; the bottom of the support leg 4 below the connecting main beam 3 is set on the ground, and the top passes through the mounting hole of the connecting main beam 3 and is fixed to the connecting main beam 3 with fixing bolts. After the support leg 4 is installed, the central body 2 and the connecting main beam 3 are in a horizontal or nearly horizontal state.

[0057] S201: Install the electric hydraulic jack 7 below the connecting main beam 3, with its bottom set on the ground and its output end abutting against the connecting main beam 3. Start the laser leveling instrument 8 to detect the levelness of the connecting main beam 3. When the laser leveling instrument 8 detects that the levelness of the connecting main beam 3 is higher than the predetermined value, the laser leveling instrument 8 sends a signal and deviation value to the controller. After receiving the signal, the controller controls the travel distance of the first electric hydraulic jack according to the deviation value until the levelness of the connecting main beam 3 reaches the predetermined value. Then, fix the support leg 4 to the connecting main beam 3 again through the fixing device 5.

[0058] S3: Insert a positioning pin into the positioning hole 301 of the main beam 3 to position one of the four sections 1.

[0059] S4: Place the corresponding part 1 from S3 onto the connecting main beam 3 and ensure it fits snugly against the locating pin from S3. Once the position of part 1 is determined ( Figure 3 (Point A is the reserved position of sub-section 1), remove all the positioning pins inserted into the positioning hole 301 in S3.

[0060] S5: Repeat steps S3 and S4 until the positions of the four parts 1 are determined, and the four parts 1 can be spliced ​​after being placed on the connecting main beam 3.

[0061] S6: When the four parts 1 cannot be properly spliced ​​after step S5, fix the sliding support 9 on the adjustment hole 302 of the connecting main beam 3, and fix the electric hydraulic jack 7 to the sliding support 9 (since the installation sequence of the sliding support 9 is after step S201, the sliding support 9 will not affect the operation of the laser leveling instrument 8); adjust the output end of the electric hydraulic jack 7 to the position of abutting against the part 1, and each of the four parts 1 corresponds to one electric hydraulic jack 7, and the four parts 1 can be spliced ​​by the electric hydraulic jack 7.

[0062] In this embodiment, the predetermined horizontality value of the signal emitted by the laser leveling instrument 8 is 1 mm / m. It should be noted that in step 201, when the electro-hydraulic jack 7 makes fine adjustments, the support leg 4 is actually already fixed to the connecting main beam 3. After the electro-hydraulic jack 7 makes the fine adjustments, the original fixing structure of the support leg 4 is destroyed, so it is necessary to re-fix the support leg 4. When the horizontality deviation is large, some of the fixing bolts on the support leg 4 can be loosened, adjusted by the electro-hydraulic jack 7, and then retightened. During the above operation, the four parts 1 can be installed sequentially in a counterclockwise or clockwise order.

[0063] This invention provides a tooling and method for assembling and adjusting large-diameter tower sections. The central body, connecting main beam, support legs, and positioning pins are all detachable, resulting in a simple structure, convenient installation, and low transportation requirements, thus reducing the intensity of pre-installation preparation. During the assembly of the tower sections, positioning pins are used for positioning, eliminating the need for additional positioning equipment, significantly reducing the difficulty for operators and improving work efficiency. The four sections can be spliced ​​after being placed in preset positions on the connecting main beam. A laser leveling instrument combined with electro-hydraulic jacks is used. When the levelness is insufficient, the controller can fine-tune the levelness of the connecting main beam using the first electro-hydraulic jack until it is level, providing a safety guarantee for tower installation. When the tower diameter does not match the equipment or the tower has defects, each section corresponds to a second electro-hydraulic jack. Each section can be pushed simultaneously by the second electro-hydraulic jack or pushed independently, ultimately achieving splicing and improving the applicability of the equipment.

[0064] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0065] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A large diameter tower section assembly adjustment tooling, the tower comprising four spliceable sections (1) split along a longitudinal direction, characterized in that, Comprise: The center body (2) is provided with at least four connecting rods (201) in the circumferential direction; The connecting main beam (3) corresponds to the connecting rod (201) and is detachably connected with the connecting rod (201), and the upper surface of the connecting main beam (3) is provided with a plurality of positioning holes (301); Supporting leg (4), the connecting main beam (3) is provided with a mounting hole through the upper and lower surfaces, the supporting leg (4) passes through the mounting hole from bottom to top, and is fixed with the connecting main beam (3) through a fixing device (5); Positioning pin, the positioning pin has a plurality of, each the subpart (1) is located between at least two adjacent connecting main beams (3) and is placed on the upper surface of the connecting main beam (3), the positioning pin is adjacent to the intersection of the subpart (1) and a plurality of the connecting main beam (3), and the positioning pin is detachably connected with the positioning hole (301); Sliding support (9) and second electric hydraulic jack, the upper surface of the connecting main beam (3) is provided with an adjusting hole (302) away from the connecting rod (201), the sliding support (9) is fixedly connected with the adjusting hole (302), the second electric hydraulic jack is fixedly connected with the sliding support (9), the second electric hydraulic jack is located between the subpart (1) and the sliding support (9), and the output end of the second electric hydraulic jack faces the subpart (1).

2. The large diameter tower section assembly alignment tool of claim 1, wherein, The connecting rod (201) has eight, and the eight connecting rods (201) are uniformly spaced.

3. The large diameter tower section assembly alignment tool of claim 1, wherein, The fixing device (5) is a fixed bolt, the outer surface of the supporting leg (4) is provided with a thread, and the fixed bolt is threadedly connected with the supporting leg (4) and fixed with the connecting main beam (3).

4. The large diameter tower section assembly alignment tool of Claim 1, wherein, It also includes connecting shaft (6), the connecting shaft (6) has at least two, the connecting main beam (3) is provided with a first through hole corresponding to the connecting shaft (6), and the connecting rod (201) is provided with a second through hole corresponding to the connecting shaft (6), and the connecting shaft (6) passes through the first through hole and the second through hole in sequence.

5. The large diameter tower section assembly alignment tool of Claim 1, wherein, It also includes a first electric hydraulic jack, a laser leveling instrument (8) and a controller, the bottom surface of the first electric hydraulic jack is flush with the bottom surface of the supporting leg (4), the output end of the first electric hydraulic jack abuts against the lower surface of the connecting main beam (3), the laser leveling instrument (8) is arranged on the upper surface of the connecting main beam (3), and the controller is in communication connection with the first electric hydraulic jack and the laser leveling instrument (8).

6. A method of assembling large diameter tower sections, characterized by, Comprise: S1: connecting the connecting rod (201) of the center body (2) with the connecting main beam (3); S2: the supporting leg (4) is fixed with the connecting main beam (3) through the fixing device (5), the bottom of the supporting leg (4) is arranged on the ground, the top passes through the mounting hole of the connecting main beam (3), and the center body (2) and the connecting main beam (3) are arranged in a horizontal state after the supporting leg (4) is installed; S3: inserting a positioning pin into the positioning hole (301) of the connecting main beam (3) for positioning one of the four parts (1); S4: placing the corresponding part (1) in S3 on the connecting main beam (3) and closely fitting with the positioning pin in S3, after the position of the part (1) is determined, removing all positioning pins inserted into the positioning hole (301) in S3; S5: repeating steps S3 and S4 until the positions of the four parts (1) are determined, and the four parts (1) can be spliced after being placed on the connecting main beam (3); S6: when the four parts (1) cannot be normally spliced after step S5 is completed, fixing the sliding support (9) on the adjusting hole (302) of the connecting main beam (3), fixing the second electric hydraulic jack with the sliding support (9), adjusting the output end of the second electric hydraulic jack to the position abutting against the part (1), the four parts (1) each corresponding to one second electric hydraulic jack, and the four parts (1) can be spliced by being pushed by the second electric hydraulic jack.

7. A method of assembling a large diameter tower section according to claim 6 wherein, Further comprising step S201: after step S2 is completed, installing the first electric hydraulic jack below the connecting main beam (3), setting the bottom on the ground, abutting the output end against the connecting main beam (3), starting the laser leveling instrument (8), detecting the levelness of the connecting main beam (3), when the laser leveling instrument (8) detects that the levelness of the connecting main beam (3) is higher than a predetermined value, the laser leveling instrument (8) sends a signal and a deviation value to the controller, after the controller receives the signal, controlling the travel distance of the first electric hydraulic jack according to the deviation value, until the levelness of the connecting main beam (3) reaches the predetermined value, and fixing the support leg (4) and the connecting main beam (3) again through the fixing device (5).

8. A method of assembling a large diameter tower section according to claim 7, wherein, The levelness predetermined value of the signal sent by the laser leveling instrument (8) is 1mm / m.

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