High-low double-column power transmission structure and column design method thereof

Abstract

The application discloses a high-low double-column type power transmission structure and a column body design method thereof. The structure comprises a plurality of tower positions arranged in sequence. Each tower position comprises a horizontally extended cross arm. Two column bodies with a height difference in the vertical direction are connected to the cross arm. The two column bodies comprise a vertical column part connected to the cross arm. The bottom of the column body is further provided with a plurality of independent legs. The legs and the vertical column part are connected through a body part. The body part is composed of a plurality of connecting parts to adjust the height of the body part. The application has the advantages of strong adaptability to steep terrain, clear force bearing of the iron tower, simple structure, large transverse stiffness, good anti-deformation capacity, convenient construction, good economy and the like, and is especially suitable for use in mountainous large-load power transmission line engineering.

Description

Technical Field

[0001] This invention belongs to the field of power transmission tower technology, and particularly relates to a high-low double-column power transmission structure and its column design method. Background Technology

[0002] Currently, in the construction of power transmission lines, the traditional high-load single-column transmission structure is often used, which is laid sequentially along the power transmission line. However, the single-column transmission structure is not only complex in construction and stress, but also has poor resistance to deformation. It also has high construction safety risks and problems such as large tower bases. In addition, its adaptability is poor when the terrain is poor, especially in high-load power transmission line projects in mountainous areas.

[0003] Therefore, a new power transmission structure is needed to overcome the above-mentioned defects in high-load power transmission line projects in mountainous areas, with strong adaptability to steep terrain, clear stress distribution on the towers, and theoretical design methods for this new power transmission structure to meet design and construction requirements. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a high-low double-column power transmission structure and its column design method. It has the advantages of strong adaptability to steep terrain, clear tower stress, simple structure, large lateral stiffness, good deformation resistance, convenient construction and good economy. It has the prospect of being promoted and applied in high-load power transmission line projects in mountainous areas.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A high-low double-column power transmission structure includes multiple tower positions arranged in sequence. Each tower position includes a horizontally extending crossarm. Two columns with a height difference in the vertical direction are connected to the crossarm. The two columns include a column part connected to the crossarm. The bottom of the column is also provided with multiple independent connecting legs.

[0007] The connecting leg is connected to the upright part via a connecting body, which is composed of multiple connecting parts to adjust the height of the connecting body.

[0008] In one embodiment, the crossarm includes a central guide crossarm, and side guide crossarms are provided on both sides of the central guide crossarm. The side guide crossarms are connected to ground wire brackets and jumper brackets, and the column part of the column is connected to the central guide crossarm.

[0009] The present invention also provides a column design method for a high-low double-column power transmission structure, comprising the following steps;

[0010] S1. Determine the horizontal distance L between the two columns based on the electrical clearance between the middle phase conductor and the middle phase jumper;

[0011] S2. Determine the short column positioning height and long column positioning height of each tower location based on the electrical positioning height and terrain slope.

[0012] S3. Take the shortest and longest column positioning heights in each tower location as standard parameters to determine the shortest and longest column nominal heights.

[0013] S4. Determine the relative heights of each column between the shortest and longest column based on their respective relative heights.

[0014] S5. Determine the length of each individual leg of each column.

[0015] In one implementation, the horizontal distance L is calculated in step S1 as follows:

[0016] L = 2δ + B;

[0017] Where δ is the electrical clearance between the middle phase conductor and the middle phase jumper, and B is the width of the slope change point between the column and the connector, with a value range of B. m.

[0018] In one embodiment, the short column positioning height and the long column positioning height are calculated in step S2 as follows:

[0019] Short column positioning height ;

[0020] Long column positioning height ;

[0021] in, The electrical positioning height for each tower location, The slope of the terrain at each tower location.

[0022] In one implementation, the shortest and longest claimed column heights are calculated in step S3 as follows:

[0023] Shortest bar calling height ;

[0024] The longest column is called the height ;

[0025] in, , ;

[0026] B is the length of the column section, and B is the width of the slope transition point between the column section and the connecting section. The single-sided slope of the body section To accommodate the maximum terrain slope.

[0027] In one embodiment, in step S4, based on the difference between the shortest column height Hd and the longest column height Hc, multiple intermediate column heights are obtained in increments of 3m.

[0028] In one implementation, the length of each individual leg of each column is calculated in step S5 as follows:

[0029] Get the vertical distance between the high and low legs of a single column. And multiple connecting legs in the middle are obtained with a 1m increment;

[0030] in, ;

[0031] The nominal height of the column (i.e., the distance between its longest leg and the crossbeam). B is the length of the column section, and B is the width of the slope transition point between the column section and the connecting section. The single-sided slope of the body section To accommodate the maximum terrain slope.

[0032] In one implementation, regarding the selection of the calculation model, the column located at the left end of the crossarm is the longest column, while the columns located at the right end are arranged sequentially from the shortest column to the longest column, and are combined with the columns at the left end one by one.

[0033] In one embodiment, two connecting legs are provided on each of the left and right sides of the bottom of the column, wherein the two connecting legs on the left side are the longest connecting legs of the column, and the two connecting legs on the right side are the shortest connecting legs of the column; or the four connecting legs at the bottom of the column are all the longest connecting legs of the column.

[0034] In one embodiment, the method further includes: calculating the internal forces of the tower structural members under each calculation model, comparing the internal forces of the common structural members under each calculation model, and selecting the largest internal force as the most unfavorable internal force of the tower structural members for cross-section design.

[0035] The beneficial effects of this invention are as follows:

[0036] The high-low double-column power transmission structure provided by this invention consists of two columns, left and right, connected by a crossarm. The joint height of the two columns can be flexibly adjusted according to the site conditions. At the same time, the two columns adopt all-round multi-leg joints, which can achieve stepless adjustment. This structure has eight tower legs, strong adaptability to steep terrain, clear tower force, simple structure, large lateral stiffness, good deformation resistance, convenient construction, and good economy. It has the prospect of being promoted and applied in high-load power transmission line projects in mountainous areas.

[0037] The design of the columns for multiple tower locations in a transmission line involves determining the horizontal distance between the two columns at each tower location based on the electrical clearance between the middle phase conductor and the middle phase jumper. The positioning height of the high and low columns at each tower location is determined by the electrical positioning height and the terrain slope. The nominal height of the column at each tower location is obtained by taking the minimum and maximum values. The construction parameters of the high and low columns at each tower location in the transmission line are obtained by determining the number of connecting legs for each connection according to the terrain, in order to adapt to steep terrain. Furthermore, a merging method is adopted to simplify the column calculation model, which can quickly obtain the column parameters of the high and low double-column transmission structure while ensuring its structural strength. Attached Figure Description

[0038] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0039] Figure 1 This shows a schematic diagram of a single-column power transmission structure in the prior art;

[0040] Figure 2 A schematic diagram of an embodiment of the present invention is shown;

[0041] Figure 3 The diagram shows the column design schematics for each tower location in this invention;

[0042] Figure 4 The diagram shows a schematic of the columns of each tower location of the present invention under a combined design method;

[0043] Figure 5 The diagram shows various leg connection designs for different tower positions according to the present invention;

[0044] Figure 6 This diagram shows the legs of the present invention under a combined design method;

[0045] Figure 7 This diagram shows a schematic of the leg of the present invention under another combined design method;

[0046] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0047] Figure label:

[0048] 1-Crossarm, 2-Column, 3-Jumper bracket, 4-Ground bracket, 101-Middle guide crossarm, 102-Side guide crossarm, 201-Column part, 202-Body part, 203-Leg part. Detailed Implementation

[0049] The invention will now be further described with reference to the accompanying drawings.

[0050] The present invention provides a high-low double-column power transmission structure, including multiple tower positions arranged in sequence. Each tower position includes a horizontally extending crossarm 1. Two columns 2 with a height difference in the vertical direction are connected to the crossarm 1. The two columns 2 include a column part 201 connected to the crossarm 1. The bottom of the column 2 is also provided with multiple independent connecting legs 203.

[0051] The connecting leg 203 is connected to the upright 201 via the connecting body 202, which is composed of multiple connecting parts to adjust the height of the connecting body 202.

[0052] The crossarm 1 includes a central crossarm 101, and side crossarms 102 are provided on both sides of the central crossarm 101. The side crossarms 102 are connected to the ground wire bracket 4 and the jumper bracket 3. The column part 201 of the column 2 is connected to the central crossarm 101.

[0053] It should be noted that, as Figure 1 and Figure 2 As shown, the traditional single-column structure of a single tower and the high-low double-column structure in this embodiment are shown respectively. Compared with the traditional single-column transmission structure, the transmission structure in this embodiment is composed of two columns with a height difference in the vertical direction, which are connected to the crossarm respectively. The height of the column can be flexibly adjusted according to the site conditions in conjunction with the connecting legs, which has a strong ability to adapt to the terrain, especially in mountainous high-load transmission line projects.

[0054] This embodiment provides a design method for a high-low dual-column power transmission structure, including the following steps:

[0055] S1. Determine the horizontal distance L between the two columns based on the electrical clearance between the middle phase conductor and the middle phase jumper;

[0056] Specifically, the horizontal distance L is calculated as follows:

[0057] L = 2δ + B;

[0058] Where δ is the electrical clearance between the middle phase conductor and the middle phase jumper, and B is the width of the slope change point between the column and the connector, with a value range of B. m

[0059] S2. Determine the short column positioning height and long column positioning height of each tower location based on the electrical positioning height and terrain slope.

[0060] Specifically, the positioning height of the short column ;

[0061] Long column positioning height ;

[0062] in, The electrical positioning height for the tower location. The slope of the terrain at the tower site;

[0063] S3. Take the shortest and longest column positioning heights in each tower location as standard parameters to determine the shortest and longest column nominal heights.

[0064] Specifically, the shortest bar is called the height ;

[0065] The longest column is called the height ;

[0066] in, , ;

[0067] B is the length of the column section, and B is the width of the slope transition point between the column section and the connecting section. The single-sided slope of the body section To accommodate the maximum terrain slope;

[0068] S4. Determine the relative heights of each column between the shortest and longest column based on their respective relative heights.

[0069] Specifically, based on the shortest column's nominal height Height comparable to the longest column The difference between them, in increments of 3m, yields multiple intermediate columns with corresponding heights;

[0070] S5. Determine the length of each individual leg of each column;

[0071] The length of each individual leg of each column is calculated as follows:

[0072] Specifically, obtain the vertical distance between the high and low legs of a single column. And multiple connecting legs in the middle are obtained with a 1m increment;

[0073] in, ;

[0074] The nominal height of the column (i.e., the distance between its longest leg and the crossbeam). B is the length of the column section, and B is the width of the slope transition point between the column section and the connecting section. The single-sided slope of the body section To accommodate the maximum terrain slope;

[0075] It should be noted that due to the diverse terrain along the entire transmission line, especially in mountainous transmission line projects where the terrain is steep and unpredictable, it is necessary to design the columns of multiple tower structures along the transmission line. The horizontal distance between two columns at each tower location is determined by utilizing the electrical clearance between the middle phase conductor and the middle phase jumper, as well as the width of the slope change point between the column and the connecting body. For example... Figure 3 As shown, by using the electrical positioning height of the tower location and the terrain slope to determine the positioning height of the short column and the long column at each tower location, the positioning heights of the short column and the long column at different tower locations along the entire transmission line can be obtained. Then, using the minimum and maximum values ​​among all short column positioning heights and all long column positioning heights as standard parameters, the nominal height of the shortest column and the nominal height of the longest column (nominal height is the distance between the farthest end of the column's connecting leg and the crossarm) can be obtained. Based on the nominal heights of the shortest and longest columns, the nominal heights of the columns at multiple intermediate tower locations are obtained in 3-meter increments, thus yielding the nominal heights of the short and long columns at each tower location. This can then be used in subsequent construction, such as... Figure 5 As shown, the construction range of the column's legs is obtained based on the terrain slope of each tower location and the maximum applicable terrain slope. Appropriate legs are selected, and the leg parameters can be met by adjusting the height of the joint in actual construction.

[0076] In one embodiment, in step S4, as Figure 4 As shown, the column located on the left end of the crossarm in each tower position adopts the maximum column nominal height of the current tower position, while the column located on the right end is set with the nominal height of the column from the shortest column nominal height Hd to the longest column nominal height Hc in sequence, and combined with the column on the left end one by one to calculate the optimal column nominal height of the column on the right end.

[0077] It should be noted that there are various design variations for the height of the columns at different locations along the entire transmission line, such as when obtaining the shortest column's nominal height. Height comparable to the longest column Then, based on a 3m increment, the nominal height of each intermediate column was determined. There are a total of m standard columns (S1, S2, ..., Sm), meaning there are m possible connections between the left and right columns. When considering the design of the connecting legs, the number of combinations in the calculation model becomes excessive. For example, theoretically, the number of combinations for two columns with eight legs is: ,by m =12, nTaking a value of 10 as an example, there are 14.4 billion possible combinations of calculation models. To address the issue of too many calculation models for high-low double-column transmission structures, the loads borne by the towers include loads in three directions: lateral, longitudinal, and vertical. The structural stress under lateral loads is related to the height of the left and right columns. When a joint is a short column, the stress is unfavorable. Therefore, each joint is combined with the longest joint, and the lateral load is calculated once in both the forward and reverse directions. The joint heights of the left and right columns no longer need to be interchanged. Figure 4 As shown, the left post is taken as the maximum contact height S. m The heights of the right pillars are selected sequentially from the shortest S1 to the longest S. m And then combine with the left pillar in sequence, that is, the combination of the left and right pillars is as follows: m 2 The number of species has been reduced to m kind;

[0078] Furthermore, such as Figure 6 As shown, in order to obtain the maximum internal force of the main material of the tower body and tower legs, the arrangement of the joints of a single column is consistent with that of a double column, that is, the two legs on the left are the longest joints corresponding to the joint body, and the two legs on the right are the shortest joints corresponding to the joint body.

[0079] In one embodiment, such as Figure 7 As shown, in order to obtain the maximum internal force of the diagonal members of the tower body and tower legs, the four legs of a single column are all taken as the longest joints corresponding to the column body.

[0080] After merging, the number of combinations of left and right column leg arrangements is reduced to 2, which makes it easier for designers to quickly complete the design of column height and leg length while ensuring the strength of column structure.

[0081] That is, for the entire transmission line, the number of calculation model combinations is... The number of species has been reduced to 2 m This significantly reduces the number of computational models;

[0082] The following working conditions are selected as design conditions: strong wind, icing, installation, wire breakage, uneven icing, and verification icing. The lateral load of each working condition is calculated once in the forward direction and once in the reverse direction. The internal forces of the tower structural members under each calculation model are calculated separately. The internal forces of the common structural members under each calculation model are compared. The largest internal force is selected as the most unfavorable internal force of the tower structural member for section design.

[0083] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0084] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A column design method for a high-low double-column power transmission structure, characterized in that, The high-low double-column transmission structure includes multiple tower positions arranged in sequence. Each tower position includes a horizontally extending crossarm. Two columns with a height difference in the vertical direction are connected to the crossarm. The two columns include a column part connected to the crossarm. The bottom of the column is also provided with multiple independent connecting legs. The connecting leg is connected to the upright part via a connecting body, which is composed of multiple connecting parts to adjust the height of the connecting body. The column design method for the high-low dual-column transmission structure includes the following steps: S1. Determine the horizontal distance L between the two columns based on the electrical clearance between the middle phase conductor and the middle phase jumper; S2. Determine the short column positioning height and long column positioning height of each tower location based on the electrical positioning height and terrain slope. S3. Take the shortest and longest column positioning heights in each tower location as standard parameters to determine the shortest and longest column nominal heights. S4. Determine the relative heights of each column between the shortest and longest column based on their respective relative heights. S5. Determine the length of each individual leg of each column.

2. The column design method for a high-low double-column power transmission structure according to claim 1, characterized in that, The crossarm includes a central guide crossarm, and side guide crossarms are provided on both sides of the central guide crossarm. The side guide crossarms are connected to ground wire brackets and jumper brackets. The column part of the column is connected to the central guide crossarm.

3. The column design method for a high-low double-column power transmission structure according to claim 1, characterized in that, In step S1, the horizontal distance L is calculated as follows: L = 2δ + B; Where δ is the electrical clearance between the middle phase conductor and the middle phase jumper, and B is the width of the slope change point between the column and the connector, with a value range of B. m.

4. The column design method for a high-low double-column power transmission structure according to claim 3, characterized in that, In step S2, the calculation methods for the positioning height of the short column and the positioning height of the long column are as follows: Short column positioning height ; Long column positioning height ; in, The electrical positioning height for each tower location, The slope of the terrain at each tower location.

5. The column design method for a high-low double-column power transmission structure according to claim 4, characterized in that, In step S3, the shortest and longest claimed column heights are calculated as follows: Minimum pole nominal height ; The longest column is called the height ; in, , ; The length of the column section. B The width of the slope change point between the column and the body. The single-sided slope of the body section To accommodate the maximum terrain slope.

6. The column design method for a high-low double-column power transmission structure according to claim 5, characterized in that, In step S4, the shortest column is called the height. Height comparable to the longest column The difference between them, in increments of 3m, yields multiple intermediate columns with corresponding heights.

7. The column design method for a high-low double-column power transmission structure according to claim 6, characterized in that, In step S5, the length of each individual leg of each column is calculated as follows: Get the vertical distance between the high and low legs of a single column. And multiple connecting legs in the middle are obtained with a 1m increment; in, ; The nominal height of the column is the distance between its longest leg and the crossbeam. B is the length of the column section, and B is the width of the slope transition point between the column section and the connecting section. The single-sided slope of the body section To accommodate the maximum terrain slope.

8. The column design method for a high-low double-column power transmission structure according to claim 7, characterized in that: Regarding the selection of the calculation model, the column located at the left end of the crossarm is the longest column, while the columns located at the right end are arranged sequentially from the shortest column to the longest column, and combined with the columns at the left end one by one.

9. The column design method for a high-low double-column power transmission structure according to claim 8, characterized in that, Two connecting legs are provided on each of the left and right sides of the bottom of the column, wherein the two connecting legs on the left side are the longest connecting legs of the column, and the two connecting legs on the right side are the shortest connecting legs of the column; or the four connecting legs at the bottom of the column are all the longest connecting legs of the column.

10. The column design method for a high-low double-column power transmission structure according to claim 9, characterized in that, Also includes: Calculate the internal forces of the tower structural members under each calculation model, compare the internal forces of the common structural members under each calculation model, and select the largest internal force as the most unfavorable internal force of the tower structural members for cross-section design.

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