A method for positioning and assembling a prestressed framed wind tower transition section

Abstract

This invention discloses a method for positioning and assembling the transition section of a prestressed frame wind tower. A magnified sample is created on the ground to determine the center point O. A transverse centerline and a longitudinal centerline are then drawn on the ground. A level and a theodolite are used to adjust the height difference and tilt deviation of the four assembly auxiliary risers, as well as the height of the four hydraulic jack base fixtures, ensuring that the deviation of the tower center is no greater than 1mm and the height deviation is no greater than 1mm. The device used has a simple structure, low cost, and convenient assembly method, which greatly improves work efficiency and effectively reduces production costs.

Description

Technical Field

[0001] This invention belongs to the field of wind tower assembly technology, specifically relating to a method for positioning and assembling the transition section of a prestressed frame wind tower. Background Technology

[0002] In recent years, with the continuous development of wind turbine technology, wind turbine power has been increasing, and wind turbine heights have been rising. Prestressed frame wind turbines consist of several parts, including a prestressed tower frame, a transition section, and a conventional tower section. The transition section connects to the prestressed tower frame below and the conventional tower section above. The transition section is not a single unit but is assembled from several parts in a factory. Due to the large span and height of the transition section, it is difficult to meet the technical requirements of a flange plane perpendicularity to the ground of no more than 2mm and a flange center coincidence with the tower body center of no more than 2mm. Traditional assembly methods struggle to guarantee this perpendicularity and coincidence. Large deviations in perpendicularity and coincidence will inevitably have a significant impact on the stability and safety of the entire tower structure. Summary of the Invention

[0003] In order to overcome the above-mentioned technical problems in the existing technical field, the purpose of this invention is to provide a method for positioning and assembling the transition section of a prestressed frame wind tower, which effectively solves the problem that the overall verticality and axial overlap deviation is large during assembly, making it difficult to meet the technical requirements.

[0004] The present invention provides a method for positioning and assembling a transition section of a prestressed frame wind tower. The transition section includes a left half, a right half, and a connecting flange. The left half and the right half are symmetrically assembled. The connecting flange is assembled below the left half and the right half. The left half includes: a left top flange, a left arc panel, a left side panel, a left front panel, and a column. The right half includes: a right top flange, a right arc panel, a right side panel, a right front panel, and a column. The method for positioning and assembling the components of the transition section includes the following steps: (1) On the ground Enlarge the sample, determine the center point O, and make the horizontal center line and the vertical center line on the ground. Use a level and a theodolite to adjust the height difference and tilt deviation of the four assembly auxiliary risers, as well as the height of the four hydraulic jack base jigs, to ensure that the deviation of the tower center is not greater than 1mm and the height deviation is not greater than 1mm; (2) Fix the left top flange and the right top flange on the top flange fixing bracket; (3) Hoist the top flange fixing bracket with the left and right top flanges fixed on the support, and fix the top flange fixing bracket and the support with positioning pins and bolts. (4) Install the inner lifting tube at the bottom of the bracket. The inner lifting tube is fitted inside the outer lifting tube. The outer lifting tube is installed on the hydraulic jack. When the hydraulic jack is working, it pushes the inner lifting tube to move up and down inside the outer lifting tube to adjust the height of the top flange. (5) Adjust the hydraulic jack to adjust the height of the top of the left and right top flanges to the corresponding height. Fix the plumb line to the two A reference points and two B reference points of the top flange fixing bracket. Repeatedly adjust the turnbuckles in the four directions so that the tips of the plumb bobs in the four directions are aligned with the transverse center line and the longitudinal center line, thereby ensuring the center point O. (6) Coincident with the center of the tower; (7) Adjust the height of the four hydraulic jacks, use a level and a theodolite to observe the two A reference points and two B reference points of the top flange fixing bracket, adjust the height of the left and right top flanges to the corresponding height, after the height and center coincidence are adjusted, use the lock nut to lock the turnbuckle to ensure that the left and right top flanges are fixed; (8) Hoist the left arc panel, left side panel, left front panel, right arc panel, right side panel, right front panel and docking flange to the corresponding positions for assembly, after the assembly and welding are completed, make a mark, this group of components is not interchangeable with other components.

[0005] After positioning the left and right top flanges with locating pins, they are fixed to the top flange fixing bracket with bolts.

[0006] The top flange fixing bracket is provided with a circular flange and a grid support. The circular flange has flange bracket holes around its circumference, and the grid support has support connection holes.

[0007] The top of the bracket is provided with a top bracket connection hole.

[0008] The outer wall of the inner lifting tube is precision machined, and the inner wall of the outer lifting tube is precision machined.

[0009] At the top of the bracket, a pull plate is welded to the center of each of the four horizontal bars. The pull plate is connected to a turnbuckle pull rod. The lower end of the turnbuckle pull rod is connected to the pull rod seat on the ground. The part of the turnbuckle pull rod near the ground is provided with a turnbuckle to adjust the length of the pull rod, thereby adjusting the position of the bracket.

[0010] The present invention provides a method for positioning and assembling the transition section of a prestressed frame wind tower. Its advantages are that it solves the problem of difficult positioning and assembly of larger components, the device structure is simple and low cost, the assembly method is easy to operate, which greatly improves work efficiency and effectively reduces production costs. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the left half of the transition section of the present invention;

[0012] Figure 2 This is a schematic diagram of the symmetrical relationship between the left and right halves of the transition section of the present invention;

[0013] Figure 3 This is a top view of one embodiment of the present invention;

[0014] Figure 4 This is a left-side view of an embodiment of the present invention;

[0015] Figure 5 This is a top view of the top flange fixing bracket of the present invention;

[0016] Figure 6 This is a schematic diagram of the three-dimensional structure of the bracket of the present invention;

[0017] Figure 7 This is a three-dimensional structural schematic diagram of the present invention;

[0018] The image is labeled as follows:

[0019] 1. Column; 2. Left arc panel; 3. Left side panel; 3A. Left front panel; 4. Butt flange; 5. Left top flange; 2-2. Right arc panel; 2-3. Right side panel; 2-3A. Right front panel; 2-5. Right top flange; 6. Assembly auxiliary riser; 7. Top flange fixing bracket; 7-1. Bracket connection hole; 7-2. Flange bracket hole; 7-3. Well-shaped bracket; 8. Lifting inner pipe; 9. Lifting outer pipe; 10. Hydraulic jack; 11. Bracket; 11-1. Top bracket connection hole; 12. Turnbuckle; 13. Plumb bob; X. Horizontal centerline; Y. Longitudinal centerline. Detailed Implementation

[0020] The following detailed description, with reference to the accompanying drawings and an embodiment, illustrates a method for positioning and assembling a transition section of a prestressed frame wind tower provided by the present invention. Example

[0021] This embodiment describes a method for positioning and assembling the transition section of a prestressed frame wind tower, referring to... Figures 1-2 The transition section includes a left half, a right half, and a mating flange 4. The left and right halves are symmetrically assembled, and the mating flange 4 is assembled below the left and right halves. The left half includes: a left top flange 5, a left arc panel 2, a left side panel 3, a left front panel 3A, and a column 1. The right half includes: a right top flange 2-5, a right arc panel 2-2, a right side panel 2-3, a right front panel 2-3A, and a column 1. (Refer to...) Figures 3-7 The method for assembling the components of the above transition section includes the following steps: (1) Magnify the sample on the ground, determine the center point O, and make the horizontal center line X and the longitudinal center line Y on the ground. Use a level and a theodolite to adjust the height difference and tilt deviation of the four assembly auxiliary risers 6, as well as the height of the four hydraulic jacks 10 base jigs, to ensure that the deviation of the tower center is not greater than 1mm and the height deviation is not greater than 1mm; (2) Fix the left top flange 5 and the right top flange 2-5 on the top flange fixing bracket 7; (3) Hoist the top flange fixing bracket 7 with the left and right top flanges fixed on the support 11, and fix the top flange fixing bracket 7 and the support 11 with positioning pins and bolts; (4) Install the lifting inner pipe 8 at the bottom of the support 11. The lifting inner pipe 8 is fitted inside the lifting outer pipe 9. The lifting outer pipe 9 is installed on the hydraulic jack 10. When the hydraulic jack 10 is working, it pushes the lifting inner pipe 8 to move up and down inside the lifting outer pipe 9 to adjust the top. (5) Adjust the height of the top flange of the left and right top flanges to the corresponding height using hydraulic jacks 10. Fix the plumb line to the two reference points A and two reference points B of the top flange fixing bracket. Repeatedly adjust the four-way turnbuckles 12 so that the tips of the plumb bobs 13 in the four directions are aligned with the transverse center line X and the longitudinal center line Y, thereby ensuring that the center point O coincides with the center of the tower. (6) Adjust the height of the four hydraulic jacks 10. Use a level and a theodolite to observe the height of the top flange fixing bracket. Two reference points A and two reference points B are used to adjust the height of the left and right top flanges to the corresponding heights. After the height and center overlap are adjusted, the turnbuckle 12 is locked with a lock nut to ensure that the left and right top flanges are fixed in position. (7) The left arc panel 2, the left side panel 3, the left front panel 3A, the right arc panel 2-2, the right side panel 2-3, the right front panel 2-3A and the docking flange 4 are hoisted to the corresponding positions for assembly. After the assembly and welding are completed, the components are marked. This set of components is not interchangeable with other components.

[0022] After positioning the left top flange 5 and the right top flange 2-5 with locating pins, they are fixed to the top flange fixing bracket 7 with bolts.

[0023] The top flange fixing bracket 7 is provided with a circular flange and a grid bracket 7-3. The circular flange is provided with flange bracket holes 7-2 around its circumference, and the grid bracket 7-3 is provided with bracket connection holes 7-1.

[0024] Furthermore, the circular flange is evenly distributed with flange bracket holes 7-2 around its circumference, and the eight support ends of the grid bracket 7-3 are fixed to the flange bracket holes 7-2 by bolts. The intersection of the grid bracket 7-3 is provided with bracket connection holes 7-1 for connecting with the bracket 11.

[0025] The bracket 11 has a top bracket connection hole 11-1 at the top for connecting with the top flange fixing bracket 7. The top bracket connection hole 11-1 is precision machined and connected to the top flange fixing bracket through a positioning pin.

[0026] The outer wall of the inner lifting tube 8 is precision machined, and the inner wall of the outer lifting tube 9 is precision machined.

[0027] A pull plate is welded to the center of each of the four horizontal bars at the top of the bracket 11. The pull plate is connected to the turnbuckle pull rod. The lower end of the turnbuckle pull rod is connected to the pull rod seat on the ground. The part of the turnbuckle pull rod near the ground is provided with a turnbuckle to adjust the length of the pull rod, thereby adjusting the position of the bracket.

Claims

1. A method for positioning and assembling the transition section of a prestressed frame wind tower, characterized in that: The transition section includes a left half, a right half, and a connecting flange. The left half and the right half are symmetrically assembled. The connecting flange is assembled below the left half and the right half. The left half includes: a left top flange, a left arc panel, a left side panel, a left front panel, and a column. The right half includes: a right top flange, a right arc panel, a right side panel, a right front panel, and a column. The method for positioning and assembling the components of the transition section includes the following steps: (1) Enlarge the sample on the ground and determine the center point O. And make a horizontal center line and a vertical center line on the ground. Use a level and a theodolite to adjust the height difference and tilt deviation of the four assembly auxiliary risers, as well as the height of the four hydraulic jack base jigs, to ensure that the deviation of the tower center is no more than 1mm and the height deviation is no more than 1mm; (2) Fix the left top flange and the right top flange on the top flange fixing bracket; (3) Hoist the top flange fixing bracket with the left and right top flanges fixed on the support, and fix the top flange fixing bracket and the support with positioning pins and bolts; (4) Install the lifting inner pipe at the bottom of the support. The lifting inner pipe is fitted inside the lifting outer pipe. The lifting outer pipe is installed on the hydraulic jack. When the hydraulic jack is working, it pushes the lifting inner pipe to move up and down inside the lifting outer pipe to adjust the height of the top flange; (5) Adjust the hydraulic jack to lift the left and right top flanges Adjust the top height to the corresponding height, fix the plumb line to the two A reference points and two B reference points of the top flange fixing bracket, and repeatedly adjust the four-way turnbuckles so that the tips of the plumb lines in the four directions are aligned with the horizontal center line and the longitudinal center line, thereby ensuring that the center point O coincides with the tower center; (6) Adjust the height of the four hydraulic jacks, use a level and a theodolite to observe the two A reference points and two B reference points of the top flange fixing bracket, adjust the height of the left and right top flanges to the corresponding height, and after the height and center coincidence are adjusted, use the lock nut to lock the turnbuckles to ensure that the left and right top flanges are fixed in position; (7) Hoist the left arc panel, left side panel, left front panel, right arc panel, right side panel, right front panel and the connecting flange to the corresponding position for assembly, and after the assembly and welding are completed, make a mark. This group of components cannot be interchanged with other components; After positioning the left and right top flanges with locating pins, they are fixed to the top flange fixing bracket with bolts.

2. The method for positioning and assembling the transition section of a prestressed frame wind tower according to claim 1, characterized in that: The top flange fixing bracket is provided with a circular flange and a grid support. The circular flange has flange bracket holes around its circumference, and the grid support has support connection holes.

3. The method for positioning and assembling the transition section of a prestressed frame wind tower according to claim 1, characterized in that: The top of the bracket is provided with a top bracket connection hole.

4. The method for positioning and assembling the transition section of a prestressed frame wind tower according to claim 1, characterized in that: The outer wall of the inner lifting tube is precision machined, and the inner wall of the outer lifting tube is precision machined.

5. The method for positioning and assembling the transition section of a prestressed frame wind tower according to claim 1, characterized in that: At the top of the bracket, a pull plate is welded to the center of each of the four horizontal bars. The pull plate is connected to a turnbuckle pull rod. The lower end of the turnbuckle pull rod is connected to the pull rod seat on the ground. The part of the turnbuckle pull rod near the ground is provided with a turnbuckle to adjust the length of the pull rod, thereby adjusting the position of the bracket.

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