Irregular polygon power transmission double-limb tower connected through inner flanges

Abstract

The invention discloses an irregular polygonal power transmission twin tower connected by inner flanges, the twin tower comprises single-limb towers arranged in pairs, the single-limb towers arranged in pairs image about a longitudinal plane, the cross section of the twin tower is an irregular polygonal cross section, and the shape of the cross section continuously changes along the longitudinal direction. Bending exists in the cross section transverse direction and the double-limb tower longitudinal direction, the double-limb tower is divided into a plurality of design sections in the longitudinal direction, the design sections comprise a tower bottom section, a tower top section and a plurality of tower middle sections, and the tower top section and the single tower middle section are each divided into at least two manufacturing sections. Longitudinal bending is manufactured in the mode that bending is replaced by straight bending, meanwhile, in order to guarantee the overall linear precision requirement of the double-limb tower, the design segments are divided into smaller manufacturing segments, and the overall linear and shape requirements of the double-limb tower are guaranteed; and the inner flange is adopted for connection, so that the structure has better wind resistance, the overall stability is enhanced, and the site construction difficulty and cost are reduced.

Description

Technical Field

[0001] The invention relates to a power transmission double-limb tower, in particular to an irregular polygonal power transmission double-limb tower with inner flange connection. Background Art

[0002] Electric towers can be divided into angle steel towers and steel pipe towers according to their structural forms. At present, most steel pipe towers in electric towers at home and abroad adopt external flange connection or plug-in connection. Their appearance is basically a single tower structure with regular 16-gons, regular 32-gons or regular 64-gons. The shape is stereotyped and relatively easy to manufacture. The special tower in the 275KV cross-sea transmission line project in Penang, Malaysia adopts an irregular polygonal double-tower structure with internal flange connection. Its segment connection design adopts internal flange connection; the cross-sectional form is composed of irregular polygons and changes continuously along the tower elevation direction; the whole tower is a double-tower structure. The overall shape is beautiful, similar to betel nut, also known as betel nut tower, but the overall manufacturing difficulty is very high. How to ensure the accuracy requirements of the internal flange connection without machining, among which the flatness of the flange, the flange through-hole rate and the close-fitting accuracy during connection are the control difficulties. How to ensure the overall linearity and shape requirements of the double-limb tower is a technical problem that needs to be solved urgently. Summary of the invention

[0003] Purpose of the invention: The purpose of the invention is to propose an irregular polygonal transmission double-limb tower with an inner flange connection to ensure the overall linear and shape requirements of the double-limb tower.

[0004] Technical solution: The double-limb tower of the present invention comprises single-limb towers arranged in pairs, which are mirror images of the single-limb towers arranged in pairs about the longitudinal plane. The cross-section of the double-limb tower is an irregular polygonal cross-section, and the shape of the cross-section changes continuously along the longitudinal direction. There are bends in the cross-section and the longitudinal direction of the double-limb tower. The double-limb tower is divided into multiple designed segments along the longitudinal direction, and adjacent designed segments are connected by inner flange components. The designed segments include a tower bottom segment, a tower top segment and multiple tower middle segments, wherein the tower top segment and a single tower middle segment are respectively divided into at least two manufacturing segments.

[0005] The segments in the tower include a plurality of standard length segments and a plurality of special position segments. Each standard length segment is further divided into manufacturing segments, and the special position segments are divided into manufacturing segments according to the cross arm positions.

[0006] When dividing the manufacturing segments within the standard length segment, the partition positions within the standard length segment are staggered by 100 mm for segmentation.

[0007] The tower top segment is divided into segments according to the position of the cross arm, including a tower crown and a double-limb segment, wherein a reserved amount is set at the top of the double-limb segment, and the tower crown is a non-expandable curved surface and is manufactured separately.

[0008] The wall panels in the manufacturing section are manufactured in blocks, and the wall panels are divided into linear twisted wall panels and conventional wall panels.

[0009] The linear twisted wall panels have slopes of various sections along the elevation direction that vary linearly and need to be manufactured separately.

[0010] The conventional wall panels are divided into blocks according to the principle that the unfolded length is not greater than 3.6m and the distance between the arc start and end lines and the free edge of the wall panel is not greater than 1.2m.

[0011] The length of the tower bottom segment is less than 7m. The length of the tower bottom segment is small and the longitudinal line shape of the bottom is small, so further segmentation is not considered.

[0012] The linear deviation of the double-limb tower is no more than 5 mm.

[0013] The inner flange assembly includes an anchor plate and a flange plate. The anchor plate includes an upper anchor plate and a lower anchor plate. The flange plate includes an upper flange plate and a lower flange plate. An upper flange plate and a lower flange plate are arranged between the upper anchor plate and the lower anchor plate. A plurality of flange stiffeners are connected between the flange plate and the adjacent anchor plates.

[0014] Beneficial effects: The present invention has the following advantages:

[0015] (1) The present invention uses a straight line to replace a curved line to manufacture the longitudinal bend. At the same time, in order to ensure the overall linear accuracy requirements of the double-limb tower, the design segment is further divided into smaller manufacturing segments to ensure the overall linear and shape requirements of the double-limb tower.

[0016] (2) The traditional external flange connection is changed to an internal flange connection, which makes the structure more wind-resistant and enhances overall stability. At the same time, the internal flange design avoids the need for external construction platforms and equipment, reducing the difficulty and cost of on-site construction.

[0017] (3) The overall shape of the present invention is special, in the form of betel nut, and has a good landscape effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the double-limb tower structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the inner flange connection of the present invention;

[0020] Figure 3 It is a schematic diagram of segment division of the double-limb tower manufacturing of the present invention;

[0021] Figure 4 It is a schematic diagram of the segment blocks of the double-limb tower of the present invention;

[0022] Figure 5 for Figure 4 Schematic diagram of a linearly twisted siding in;

[0023] Figure 6 for Figure 5 Special tire frame for manufacturing linear twisted siding;

[0024] Figure 7 It is a schematic diagram of the overall assembly frame of a single-limb tower of the present invention;

[0025] Figure 8 It is a front view of the overall assembly frame of the single-limb tower of the present invention;

[0026] Fig. 9 It is a schematic diagram of the overall pre-assembled frame of the double-limb tower of the present invention;

[0027] Fig.10 This is a schematic diagram of the left and right sections of the present invention participating in the overall pre-assembly of the entire tower;

[0028] Fig.11 for Figure 6 Cross-sectional views of the support plate of the special tire frame for manufacturing linear twisted wall panels; wherein, (a) is the AA cross-sectional view; (b) is the BB cross-sectional view; (c) is the CC cross-sectional view; (d) is the DD cross-sectional view; (e) is the EE cross-sectional view;

[0029] Fig.12 It is a schematic diagram of positioning the first wall panel unit and the tire frame;

[0030] Fig.13 Schematic diagram of positioning flange plate and anchor plate for assembly;

[0031] Fig.14 It is a schematic diagram of positioning the second wall panel unit and the fifth wall panel unit with the tire frame;

[0032] Fig.15 It is a schematic diagram of positioning the third wall panel unit and the fourth wall panel unit with the tire frame. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, the irregular polygonal power transmission double-limb tower connected with the inner flange of the present invention includes wall panels and partitions. Multiple partitions are arranged longitudinally along the double-limb tower. A number of longitudinal ribs are arranged on the inner side of the wall panels. The cross section of the double-limb tower is an irregular polygonal cross section, and the cross section shape changes continuously along the longitudinal direction. There is an arc bend in the cross section. In addition, there is also a bend in the longitudinal direction of the double-limb tower. The superposition of the transverse bend and the vertical bend causes irregular distortion at each arc of the steel tower wall panel, which cannot be processed. Therefore, the longitudinal bend is manufactured by replacing the curve with a straight line. At the same time, in order to ensure the overall linear accuracy requirements of the double-limb tower, the design segment is further divided into smaller manufacturing segments. The general principle is to control the linear deviation to be no more than 5mm. Figure 3As shown. The adjacent design segments are connected by internal flanges, such as Figure 2 As shown, the inner flange connection includes an anchor plate and a flange plate. The anchor plate includes an upper anchor plate 41 and a lower anchor plate 42. The flange plate includes an upper flange plate 51 and a lower flange plate 52. An upper flange plate 51 and a lower flange plate 52 are provided between the upper anchor plate 41 and the lower anchor plate 42. A plurality of flange stiffeners 53 are connected between the flange plate and adjacent anchor plates.

[0035] like Figure 3 As shown in the figure, the design segments of the double-limb tower are divided into the bottom segment, the middle segment and the top segment. The length of the bottom segment is less than 7m. The length of the bottom segment in this embodiment is 6.3m. The length of the bottom segment is small and the longitudinal line shape of the bottom is small, so it is not considered to be segmented again. The middle segment includes standard length segments and special position segments. The standard length segment in this embodiment is Figure 3 Segments 02 to 07 in the standard length are 10m, and each standard length segment is further divided into manufacturing segments. When dividing the manufacturing segments, the partition position in the standard length segment is staggered by 100mm, and the segment lengths are 5.1m and 4.9m respectively. Segments 08 to 10 are special position segments, which are segmented according to the cross arm position. The remaining segments are tower top segments. The tower top segment of this embodiment is segment 11, with a length of 6.2 meters. The tower top segment includes two manufacturing segments, which are welded by the upper tower crown and the lower double-limb segment. The lower double-limb segment is used as the double-limb tower joint segment and a 30mm reserve is set at the top. The upper tower crown is a non-expandable curved surface and is manufactured separately.

[0036] Since the cross section of the double-limb tower is an irregular polygonal cross section that keeps changing, and the angle between the wall panel and the horizontal keeps changing, the wall panels in the segment will be linearly twisted. Therefore, the wall panels with linear twist need to be divided and manufactured separately. The remaining wall panels are divided according to the principle that the unfolded length is not more than 3.6m, and the distance between the arc start and end line and the free edge of the panel is not more than 1.2m. Figure 4 As shown, the wall panels are divided into a first wall panel 31, a second wall panel 32, a third wall panel 33, a fourth wall panel 34 and a fifth wall panel 35. The slopes of the upper and lower sections of the second wall panel 32 and the fifth wall panel 35 are different, resulting in distortion of the wall panels. According to the actual BIM model, the slopes of the sections of the wall panels along the elevation direction change linearly, as shown below Figure 5 The first wall panel 31, the third wall panel 33 and the fourth wall panel 34 are divided into blocks according to the principle that the unfolded length is not greater than 3.6m and the distance between the arc start and end lines and the free edge of the panel is not greater than 1.2m.

[0037] The second wall plate 32 and the fifth wall plate 35 are made of Figure 6The tire frame shown in the figure is manufactured, and the tire frame includes a ground platform 326 and a plurality of integral support plates. The ground platform 326 is fixed to the foundation by expansion bolts, and linear twisted wall panels are placed on the surfaces of the plurality of integral support plates. The thickness of the integral support plates is not less than 16 mm, and the slope of the support plates on each section must be consistent with the linear twisted wall panels. The integral support plates include a first support plate 321, a second support plate 322, a third support plate 323, a fourth support plate 324 and a fifth support plate 325. A ground platform 326 is provided at the bottom of each support plate. The cross-sectional views of the first support plate 321, the second support plate 322, the third support plate 323, the fourth support plate 324 and the fifth support plate 325 are respectively shown in FIG. Fig.11 As shown in (a) to (e).

[0038] The manufacturing process of the second wall panel 32 and the fifth wall panel 35 includes the following steps:

[0039] 1) First, assemble the tire frame. The tire frame is composed of a ground platform and an integral support plate. The entire tire frame must have a certain rigidity. The ground platform and the foundation are fixed with expansion bolts. The thickness of the integral support plate is 20mm, and the slope of the support plate on each section must be consistent with the linear twist wall plate. Inspect the tire frame and control the linear error to not exceed 2mm;

[0040] 2) placing the second wall panel 32 or the fifth wall panel 35 on the tire frame, fixing the wall panel and the tire frame with a U-shaped clamp, and forming them with a heat straightening process. The heat straightening temperature does not exceed 650° C. The heat straightening should be performed in a step-by-step manner until the wall panel and the tire frame are 100% in close contact;

[0041] 3) During the thermal correction process, a level is used to measure the elevation of each feature point and monitor the linear shape of the siding until the thermal correction is qualified.

[0042] The manufacturing process of the irregular polygonal double-limb power transmission tower with inner flange connection of the present invention comprises the following steps:

[0043] S1. Split-type assembly: Continuously assemble the left and right single-limb towers on the single-limb tower assembly frame to complete segment manufacturing; according to the characteristics of the segment cross section, the assembly is carried out with the outermost maximum straight edge as the bottom edge, which is convenient for the longitudinal line control of the single-limb tower and the assembly frame design. Specifically include:

[0044] S11, make a single-limb tower assembly frame, such as Figure 7 and Figure 8As shown, the overall assembly frame of the single-leg tower adopts a symmetrical structure, including a crossbeam 1, a plurality of vertical support plates 3 are arranged on the top of the crossbeam 1, and diagonal supports 4 are symmetrically arranged on both sides of the vertical support plates 3. A supporting column 5 is connected between the bottom of the diagonal support and the crossbeam 1, and a plurality of lateral support plates 2 are arranged at intervals on the opposite sides of the diagonal supports 4 on both sides, and the lateral support plates 2 are arranged vertically to the diagonal supports 4; a platform is set up on the top of the diagonal support 4, and a skirting board is respectively arranged on one side of the two side platforms close to each other, and a guardrail is arranged on the other side, and a supporting column 5 is also connected between the bottom of the platform and the crossbeam 1.

[0045] The vertical curve of the single-leg tower is achieved by setting and adjusting the elevation of the vertical support plate 3. The lateral support plate 2 is set according to the slope of different sections of the linear twisted wall plate to ensure that the elevation of the tire frame support plate at different sections is consistent with the outer surface contour of the single-leg tower. The overall contour of the tire frame support plate is 2mm larger than the outer surface contour of the steel tower, which has a certain adjustment margin when assembling the total segment and is easy to assemble.

[0046] S12. Establish a plane measurement control network and an elevation measurement control network: measure the tire frame and control the linear deviation to be no more than 3mm. At the same time, lay out the ground sample line as the longitudinal reference line for subsequent segment assembly.

[0047] S13, assembling the wall panels into wall panel units, and positioning the wall panel units and the tire frame, specifically comprising:

[0048] S131, after assembling the first wall panel 31 into the first wall panel unit 310, the first wall panel unit 310 is positioned with the tire frame to ensure that the center line of the wall panel unit coincides with the longitudinal reference line, and the wall panel is closely attached to the support plate, such as Fig.12 As shown;

[0049] S132. Position the anchor plates and flange plates in the corresponding positions. The upper and lower flange plates need to be matched and made in pairs, and connected into a whole with bolts and rivets. The whole is assembled and positioned during assembly. In addition, when assembling the anchor plates and flange plates, the through-hole rate of the upper and lower anchor plates and the upper and lower flange plates needs to be controlled to reach 100%, and then the anchor plates and flange plates are positioned. The flange plates are only temporarily positioned, such as Fig.13 As shown;

[0050] S133, sequentially locate the second wall panel unit 320 and the fifth wall panel unit 350 on both sides, check the baseline spacing between the second wall panel unit 320, the fifth wall panel unit 350 and the first wall panel unit 310, and control the spacing difference between the two to be no more than 3mm, while ensuring that the wall panel unit is in close contact with the support plate, such as Fig.14 As shown;

[0051] S134, sequentially locate the third wall panel unit 330 and the fourth wall panel unit 340 on the upper side, check the cross-sectional height and the baseline spacing between the third wall panel unit 330, the fourth wall panel unit 340 and the first wall panel unit 310, and control the cross-sectional height deviation to be no greater than 2 mm and the baseline spacing difference to be no greater than 3 mm. Fig.15 As shown;

[0052] S14. Repeat the above step S13, and assemble each step in a step-by-step manner, that is, assemble the first wall panel unit 310 in a step-by-step manner, assemble the anchor plate and the flange plate in a step-by-step manner, assemble the second wall panel unit 320 and the fifth wall panel unit 350 in a step-by-step manner, and assemble the third wall panel unit 330 and the fourth wall panel unit 340 in a step-by-step manner.

[0053] S15. Measure the longitudinal line shape of the single-leg tower. The measurement positions are selected at both ends of the segment and the partition position. The top surface elevation deviation is controlled to be no more than 4mm.

[0054] S16, welding anchor plates, wall plate butt welds, segments, flange plates, specifically including:

[0055] S161. After the measurement is qualified, the upper and lower flange plates are removed as a whole, and the upper and lower anchor plates are welded to the wall plate with full penetration fillet welds. Before welding, long bolts and long punches are used to fix the upper and lower anchor plates to reduce welding deformation;

[0056] S162, welding wall panel butt weld, only the base welding is performed, after completion, the bolts, rivets and decode are removed, each segment is hoisted to the special segment welding cradle, the remaining welding work is carried out, and the welding operation is carried out by turning over process, the welding position is optimized, the welding deformation is reduced, and the weld quality is improved. After the segment welding is completed, the segment is trimmed and corrected to control the segment distortion deformation to be less than L / 3000;

[0057] S163. After the segment trimming is completed, each segment is returned to the general assembly frame for reset, and the upper and lower flange plates are assembled to ensure that the hole group of the upper and lower flange plates and the upper and lower anchor plates has a 100% through-hole rate, and the gap between the upper and lower flange plates is not greater than 1.0 mm. The flange plate is positioned, and the flange plate and the anchor plate are fixed with bolts and rivets;

[0058] S164, welding the flange plate and the wall plate through penetration weld. When welding the flange plate and the wall plate through penetration weld, two people need to weld synchronously in the same direction to reduce welding deformation and avoid angular deformation after welding the flange plate and the wall plate, which may lead to excessive clearance between the upper and lower flange plates.

[0059] S165. After the segment is reset, the flange plate is assembled and welded, the flange is assembled and stiffened, the whole is disassembled, and the lower tire of the segment is turned over and the flange is welded and stiffened.

[0060] S2. Integral pre-assembly: The completed left and right single-limb tower segments are pre-assembled on the double-limb tower integral pre-assembly frame for the whole tower. The double-limb tower is placed and pre-assembled according to the actual tower position. Fig. 9 As shown, the integral pre-assembled tire frame includes a tire frame cross beam 20, and a support plate assembly is arranged on the top of the tire frame cross beam 20 in a mirror image. The support plate assembly includes a first support plate 22 and a tire frame diagonal support 21. A plurality of second support plates 23 are vertically fixed on the surface of the tire frame diagonal support 21. The first support plate 22 is arranged at a support plate elevation according to the slope of the linear twisted wall plate, and ensures that the horizontal tower center lines of all steel tower segments are at the same elevation. The second support plate 23 is used for limiting. Specifically, the following steps are included:

[0061] S21, making a pre-assembled frame of a double-limb tower, arranging the elevation of the first support plate 22 according to the slope of the linear twisted wall plate, and ensuring that the transverse tower center lines of all steel tower segments are at the same elevation, and the second support plate 23 is used for limiting;

[0062] S22, arrange the plane measurement control network, the elevation measurement control network, and at the same time release the tower longitudinal center line as the subsequent segment assembly positioning reference;

[0063] S23, measuring the overall pre-assembled tire frame, and controlling the elevation deviation of the first support plate 22 to be no greater than 2 mm;

[0064] S24, sequentially positioning the left and right sections on the overall pre-assembly frame for pre-assembly, such as Fig.10 As shown;

[0065] S25. Measure the dimensions of the two ends of the left and right segments and the longitudinal center line of the tower respectively, and control the linear deviation to be no more than 5mm. The height of the center of the hole group at the end of the segment from the top surface of the tire frame shall be controlled to be no more than 2mm.

[0066] S26, assembling segments: after passing the test, fix the segments to the tire frame, assemble the segments in sequence, use bolts and impulse fixation between the segments to ensure 100% through-hole rate, and when assembling to the tower top segment, measure the longitudinal deviation of the left and right segments, and cut the top opening margin of the joint segment in the tower top segment according to the actual deviation, assemble the tower crown, and weld the tower crown and the joint segment into an integral segment; weld the transverse butt welds between the manufactured segments;

[0067] S27. After welding is completed, measure the overall line shape and arrange monitoring points according to monitoring requirements, remove the tire and hand it over to sandblasting and painting operations.

Claims

1. An irregular polygonal double-limb transmission tower with inner flange connection, characterized in that: The double-limb tower includes single-limb towers arranged in pairs, which are mirrored about the longitudinal plane. The cross-section of the double-limb tower is an irregular polygonal cross-section, and the shape of the cross-section changes continuously along the longitudinal direction. There are bends in the transverse direction of the cross-section and in the longitudinal direction of the double-limb tower. The double-limb tower is divided into multiple designed segments along the longitudinal direction, and adjacent designed segments are connected by inner flange components. The designed segments include a tower bottom segment, a tower top segment and multiple tower middle segments, wherein the tower top segment and a single tower middle segment are respectively divided into at least two manufacturing segments.

2. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 1, characterized in that: The segments in the tower include a plurality of standard length segments and a plurality of special position segments. Each standard length segment is further divided into manufacturing segments, and the special position segments are divided into manufacturing segments according to the cross arm positions.

3. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 2, characterized in that: When the manufacturing segments within the standard length segment are divided, the positions of the partitions within the standard length segment are staggered for segmentation.

4. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 1, characterized in that: The tower top segment is divided into segments according to the position of the cross arm, including a tower crown and a double-limb segment, wherein a reserved amount is set at the top of the double-limb segment.

5. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 1, characterized in that: The wall panels in the manufacturing section are manufactured in blocks, and the wall panels are divided into linear twisted wall panels and conventional wall panels.

6. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 5, characterized in that: The slopes of each section of the linear twisted wall panel along the elevation direction vary linearly.

7. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 5, characterized in that: The conventional wall panels are divided into blocks according to the principle that the unfolded length is not greater than 3.6m and the distance between the arc start and end lines and the free edge of the wall panel is not greater than 1.2m.

8. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 1, characterized in that: The length of the tower bottom segment is less than 7m.

9. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 1, characterized in that: The linear deviation of the double-limb tower is no more than 5 mm.

10. The irregular polygonal double-limb power transmission tower with inner flange connection according to claim 1, characterized in that: The inner flange assembly includes an anchor plate and a flange plate. The anchor plate includes an upper anchor plate and a lower anchor plate. The flange plate includes an upper flange plate and a lower flange plate. An upper flange plate and a lower flange plate are arranged between the upper anchor plate and the lower anchor plate. A plurality of flange stiffeners are connected between the flange plate and the adjacent anchor plates.

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