Double-loop crossing transmission tower

Abstract

The utility model belongs to the technical field of power transmission line iron towers, and particularly relates to a double-loop crossed spanning power transmission iron tower which comprises tower legs, a tower body and a tower head. The tower head comprises an upper tower head section and a lower tower head section which are adjacently arranged up and down; the upper tower head section is provided with an upper ground wire support and an upper wire cross arm which are vertically spaced and arranged in parallel. The lower tower head section is provided with a lower ground wire support and a lower wire cross arm which are vertically spaced and arranged in parallel. The projections of the upper wire cross arm and the lower wire cross arm on the horizontal plane intersect with each other. By arranging the upper wire cross arm and the lower wire cross arm which are vertically arranged at intervals and are different in length direction, double-loop power transmission lines in different directions are crossed and spanned at the same power transmission tower, the occupied area is saved, the construction amount is reduced, the construction cost is saved, and the power failure time during construction is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of power transmission line iron towers, in particular to a double-circuit cross-over power transmission iron tower. Background Art

[0002] With the development and construction of my country's power industry, there are more and more crossovers between transmission lines. When two lines cross, it is necessary to raise one or two iron towers near the crossing point of one of the lines so that the two transmission lines can be arranged at intervals in the vertical direction. In actual construction, new lines are generally erected according to the height of the original lines. If the distance between the original lines and the ground is limited and the new lines are not allowed to drill through, it is necessary to set up two crossover iron towers for erecting new lines near the crossing points of the lines, or replace the two original line iron towers near the crossing points of the lines with higher iron towers. In the above two construction and reconstruction methods, the number of iron towers required to be erected at the crossing points is large, which occupies a large area, has a large construction volume and high cost. The power outage time is long during construction, which affects people's livelihood. In addition, in actual construction, the land near the crossing points of the lines is often tight, and there is no reserved space for iron tower construction. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a transmission iron tower which enables double-circuit transmission lines with different directions to cross over at the same transmission iron tower, thereby reducing the construction workload and saving the construction cost.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a double-circuit cross-span transmission iron tower, comprising tower legs, a tower body and a tower head;

[0005] The tower head comprises an upper tower head section and a lower tower head section which are arranged adjacent to each other vertically; the upper tower head section is provided with an upper ground wire bracket and an upper conductor cross arm which are arranged in parallel with each other vertically, and the lower tower head section is provided with a lower ground wire bracket and a lower conductor cross arm which are arranged in parallel with each other vertically.

[0006] The projections of the upper conductor cross arm and the lower conductor cross arm on a horizontal plane intersect each other.

[0007] Furthermore, the projections of the upper conductor cross arm and the lower conductor cross arm on a horizontal plane are in a cross structure.

[0008] Furthermore, the upper tower head section is provided with at least two upper ground wire hanging points and three upper conductor hanging points;

[0009] The lower tower head section is provided with at least two lower ground wire hanging points and three lower conductor hanging points.

[0010] Furthermore, the upper conductor hanging point includes a first upper conductor hanging point and a second upper conductor hanging point respectively arranged at both ends of the upper conductor cross arm, and also includes a third upper conductor hanging point whose connection line with the first upper conductor hanging point and the second upper conductor hanging point on a vertical plane forms a triangle structure;

[0011] The lower conductor hanging points include a first lower conductor hanging point and a second lower conductor hanging point respectively arranged at both ends of the lower conductor cross arm, and also include a third lower conductor hanging point which forms a triangle structure with the first lower conductor hanging point and the second lower conductor hanging point on a vertical plane.

[0012] Furthermore, two upper ground wire hanging points are respectively provided at both ends of the upper ground wire bracket; two lower ground wire hanging points are respectively provided at both ends of the lower ground wire bracket;

[0013] The first upper conductor hanging point, the second upper conductor hanging point, and the third upper conductor hanging point are respectively provided with two along the length direction of the upper transmission line, and the two upper ground wire hanging points located at the same end of the upper ground wire support are arranged along the length direction of the upper transmission line;

[0014] The first lower conductor hanging point, the second lower conductor hanging point and the third lower conductor hanging point are respectively provided with two along the length direction of the lower transmission line, and the two lower ground wire hanging points located at the same end of the lower ground wire bracket are arranged along the length direction of the lower transmission line.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a double-circuit cross-spanning truncated iron tower to replace the two-base crossover iron towers and two-base drilling iron towers on the double-circuit transmission lines that cross each other, and realizes the crossover of double-circuit transmission lines with different directions at the same transmission iron tower by arranging upper conductor crossarms and lower conductor crossarms arranged at intervals and in different length directions, thereby saving floor space, reducing construction volume, saving construction costs, and shortening power outage time during construction; by arranging the projections of the upper conductor crossarms and the lower conductor crossarms on the horizontal plane in a cross shape, The force of the entire iron tower in the horizontal direction is symmetrical and balanced, thereby improving the safety and reliability of the iron tower; by arranging at least three upper conductor hanging points whose lines are in a triangular structure on the vertical plane and three lower conductor hanging points whose lines are in a triangular structure on the vertical plane, the electrical gap between the transmission lines in the same loop is guaranteed, the length of the upper conductor cross arm and the lower conductor cross arm is shortened, the width of the line corridor is saved, the load on the tower head is reduced, and the influence of wind on the iron tower is reduced; by arranging a plurality of conductor hanging points arranged in pairs, the utility model can be used as both a straight tower and a tension tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the shaft side structure of the utility model;

[0017] Figure 2 It is a main structural schematic diagram of the utility model;

[0018] Figure 3 It is a left-side structural schematic diagram of the utility model;

[0019] Figure numerals: 1-tower leg; 2-tower body; 3-tower head; 31-upper tower head section; 32-lower tower head section; 33-vertical truss; 4-upper ground wire support; 41-upper ground wire hanging point; 5-upper conductor cross arm; 50-upper conductor hanging point; 51-first upper conductor hanging point; 52-second upper conductor hanging point; 53-third upper conductor hanging point; 6-lower ground wire cross arm; 61-lower ground wire hanging point; 7-lower conductor cross arm; 70-lower conductor hanging point; 71-first lower conductor hanging point; 72-second lower conductor hanging point; 73-third lower conductor hanging point; 8-tension insulator string. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] As attached Figure 1-3 As shown, a double-circuit cross-span transmission tower comprises a tower leg 1, a tower body 2 and a tower head 3, wherein the tower head 3 comprises an upper tower head section 31 and a lower tower head section 32 which are arranged adjacent to each other vertically; an upper ground wire support 4 and an upper conductor cross arm 5 which are arranged in parallel with each other at an interval up and down are arranged on the upper tower head section 31, and a lower ground wire support 6 and a lower conductor cross arm 7 which are arranged in parallel with each other at an interval up and down are arranged on the lower tower head section 32; the projections of the upper conductor cross arm 5 and the lower conductor cross arm 7 on the horizontal plane intersect each other.

[0022] When in use, the utility model is arranged at the crossing of a double-circuit power transmission line. The upper tower head section 31 is used to install the upper power transmission line, and the lower tower head section 32 is used to install the lower power transmission line. The upper power transmission line includes an upper overhead ground wire and an upper power transmission line arranged in parallel, and the lower power transmission line includes a lower overhead ground wire and a lower power transmission line arranged in parallel. The projections of the upper power transmission line and the lower power transmission line on the horizontal plane intersect each other. The upper ground wire bracket 4 is used to set up and install the upper overhead ground wire, and the upper conductor cross arm 5 is used to set up and install the upper power transmission line. In addition, the two are also used to ensure the electrical clearance between the wires of the upper power transmission line. The electrical clearance refers to the shortest spatial distance measured between two conductive parts or between a conductive part and the protective interface of the equipment, that is, the shortest distance that can be insulated by air while ensuring stable and safe electrical performance. Correspondingly, the lower ground wire bracket 6 is used to support and install the lower overhead ground wire, and the lower conductor cross arm 7 is used to support and install the lower power transmission line. The two are also used to ensure the electrical clearance between the lower power transmission line and the upper power transmission line. The utility model replaces two crossing towers and two drilling towers on a double-circuit transmission line that crosses and spans each other, and realizes the crossing and spanning of double-circuit transmission lines in different directions at the same transmission tower by arranging upper conductor cross arms 5 and lower conductor cross arms 7 that are arranged at intervals up and down and have different length directions, thereby saving floor space, reducing construction volume, saving construction costs, and shortening power outage time during construction.

[0023] The tower leg 1 is located at the lower part of the iron tower, and the transmission iron tower can be fixedly installed on the foundation through the shoe plate and the base plate; the tower head 3 is located at the upper part of the iron tower, and is used to set up and install the transmission line; the tower body 2 is located between the tower leg 1 and the tower head 3, and is used to transfer the load and ensure the nominal height of the iron tower. The tower head 3 includes a vertical truss 33 arranged adjacent to the tower body 2, and the upper conductor cross arm 5 and the lower conductor cross arm 7 are both installed on the vertical truss 33. The upper ground wire bracket 4 and the lower ground wire bracket 6 can be directly installed on the vertical truss 33, or the upper ground wire bracket 4 can be installed on the upper conductor cross arm 5, and the lower ground wire bracket 6 can be installed on the lower conductor cross arm 7. Generally, the upper ground wire bracket 4, the upper conductor cross arm 5, the lower ground wire bracket 6 and the lower conductor cross arm 7 are all set as a truss structure, which can be assembled with steel materials such as angle steel, round steel pipe, rectangular steel pipe, etc., and can be installed on the vertical truss 3 by bolt connection, pin connection or welding. Preferably, the upper ground wire support 4, the upper conductor cross arm 5, the lower ground wire support 6 and the lower conductor cross arm 7 are all connected to the vertical truss 33 through node plates and bolts, which is convenient for assembly, disassembly and maintenance.

[0024] The angle between the upper conductor cross arm 5 and the lower conductor cross arm 7 on the horizontal plane projection is determined according to the direction of the upper transmission line and the lower transmission line, and the angle can be an acute angle, a right angle or an obtuse angle. Preferably, the projections of the upper conductor cross arm 5 and the lower conductor cross arm 7 on the horizontal plane are in a cross-shaped structure, so that the force of the entire iron tower in the horizontal direction is symmetrical and balanced, and the safety and reliability of the iron tower is improved. The cross-sectional outer contour of the vertical truss 33 on the tower head 3 connected to the tower body 2 is a square structure, which is convenient for the installation of the upper conductor cross arm 5 and the lower conductor cross arm 7.

[0025] When the iron tower of the utility model is used to erect a DC transmission line, the upper tower head section 31 should have at least two upper ground wire hanging points 41 and two upper conductor hanging points 50, and the lower tower head section 32 should have at least two lower ground wire hanging points 61 and two lower conductor hanging points 70. Preferably, at least two upper ground wire hanging points 41 and three upper conductor hanging points 50 are provided on the upper tower head section 31; at least two lower ground wire hanging points 61 and three lower conductor hanging points 70 are provided on the lower tower head section 32. The transmission iron tower of this structure can be used to erect both DC transmission lines and AC transmission lines.

[0026] At least three upper conductor hanging points 50 can be installed on the upper conductor cross arm 5, and at least three lower conductor hanging points 70 can be installed on the lower conductor cross arm 7. In order to meet the electrical clearance between the transmission lines, the upper conductor cross arm 5 and the lower conductor cross arm 7 need to be set to be sufficiently long. Preferably, the upper conductor hanging point 50 includes a first upper conductor hanging point 51 and a second upper conductor hanging point 52 respectively arranged at both ends of the upper conductor cross arm 5, and also includes a third upper conductor hanging point 53 whose connection line with the first upper conductor hanging point 51 and the second upper conductor hanging point 52 on the vertical plane is in a triangular structure; the lower conductor hanging point 70 includes a first lower conductor hanging point 71 and a second lower conductor hanging point 72 respectively arranged at both ends of the lower conductor cross arm 7, and also includes a third lower conductor hanging point 73 whose connection line with the first lower conductor hanging point 71 and the second lower conductor hanging point 72 on the vertical plane is in a triangular structure. While ensuring the electrical clearance between the transmission lines in the same loop, the length of the upper conductor cross arm 5 and the lower conductor cross arm 7 can be shortened, the width of the line corridor can be saved, the load on the tower head 3 can be reduced, and the impact of wind on the iron tower can be reduced. The "connection line" in the above-mentioned "connection line in a triangular structure" is a virtual line, which is only used to indicate the positional relationship between the conductor hanging points. The height positions of the first upper conductor hanging point 51 and the second upper conductor hanging point 52 to the ground can be the same or different; the height positions of the first lower conductor hanging point 71 and the second lower conductor hanging point 72 to the ground can be the same or different. The third upper conductor hanging point 53 and the third lower conductor hanging point 73 can both be set on the vertical truss 33, the height position of the third upper conductor hanging point 53 to the ground can be higher or lower than the height position of the upper conductor cross arm 5 to the ground, and the height position of the third lower conductor hanging point 73 to the ground can be higher or lower than the height position of the lower conductor cross arm 7 to the ground.

[0027] Preferably, two upper ground wire hanging points 41 are respectively provided at both ends of the upper ground wire support 4; two lower ground wire hanging points 61 are respectively provided at both ends of the lower ground wire support 6; two of the first upper conductor hanging points 51, the second upper conductor hanging points 52, and the third upper conductor hanging points 53 are respectively provided along the length direction of the upper transmission line, and the two upper ground wire hanging points 41 located at the same end of the upper ground wire support 4 are arranged along the length direction of the upper transmission line; two of the first lower conductor hanging points 71, the second lower conductor hanging points 72, and the third lower conductor hanging points 73 are respectively provided along the length direction of the lower transmission line, and the two lower ground wire hanging points 61 located at the same end of the lower ground wire support 6 are arranged along the length direction of the lower transmission line. The transmission tower of this structure can be used as both a straight tower and a tension tower. When the transmission tower is used as a straight tower, the transmission line can be erected on the above-mentioned ground wire hanging points and conductor hanging points through a V-shaped insulator string or an I-shaped insulator string. When the transmission tower is used as a tension tower, the first upper conductor hanging point 51, the second upper conductor hanging point 52 and the third upper conductor hanging point 53 are all provided with a tension insulator string 8 for connecting the upper transmission line; the first lower conductor hanging point 71, the second lower conductor hanging point 72 and the third lower conductor hanging point 73 are all connected with a tension insulator string 8 for connecting the lower transmission line. The transmission line is connected to the tension insulator string 8, and the transmission lines in adjacent tension sections on the same circuit are connected and conducted at the tower head 3 through jumpers. If necessary, the electrical clearance between the transmission lines can be ensured by setting a jumper string on the tower head 3. The tension insulator string 8 mainly includes two types: a ceramic tension insulator string and a composite tension insulator string, which can effectively isolate the transmission line from the ground and enable each transmission line to maintain its own position.

[0028] The transmission wire and the ground wire need to be connected by a jumper at the transmission tower. The jumper bracket is generally set on the ground wire bracket and extends downward. Preferably, the height position of the third upper wire hanging point 53 is higher than the height positions of the first upper wire hanging point 51 and the second upper wire hanging point 52, and the height position of the third lower wire hanging point 73 is higher than the height positions of the first lower wire hanging point 71 and the second lower wire hanging point 72. The upper and lower transmission circuits do not interfere with each other and are convenient for installation and arrangement, ensuring the electrical clearance between the transmission lines and ensuring power transmission safety.

[0029] The above is a specific implementation method of the utility model. It can be seen from the implementation process that the utility model provides a double-circuit cross-spanning dry-shaped iron tower to replace the two-base crossing iron towers and two-base drilling iron towers on the double-circuit transmission lines that cross each other. By arranging upper conductor crossarms and lower conductor crossarms arranged at intervals and having different lengths, double-circuit transmission lines with different directions can cross each other at the same transmission tower, saving floor space, reducing construction volume, saving construction costs, and shortening power outage time during construction; by making the projections of the upper conductor crossarm and the lower conductor crossarm on the horizontal plane cross in a cross shape The arrangement makes the force of the entire iron tower symmetrical and balanced in the horizontal direction, thereby improving the safety and reliability of the iron tower; by arranging at least three upper conductor hanging points whose lines are in a triangular structure on the vertical plane and three lower conductor hanging points whose lines are in a triangular structure on the vertical plane, the electrical clearance between the transmission lines in the same loop is guaranteed, the length of the upper conductor cross arm and the lower conductor cross arm is shortened, the width of the line corridor is saved, the load on the tower head is reduced, and the influence of wind on the iron tower is reduced; by arranging a plurality of conductor hanging points arranged in pairs, the utility model can be used as both a straight tower and a tension tower.

Claims

1. A double-circuit cross-span transmission iron tower, comprising a tower leg (1), a tower body (2) and a tower head (3), characterized in that: The tower head (3) comprises an upper tower head section (31) and a lower tower head section (32) arranged adjacent to each other in the upper and lower directions; the upper tower head section (31) is provided with an upper ground wire support (4) and an upper conductor cross arm (5) arranged in parallel with each other in the upper and lower directions, and the lower tower head section (32) is provided with a lower ground wire support (6) and a lower conductor cross arm (7) arranged in parallel with each other in the upper and lower directions; The projections of the upper conductor cross arm (5) and the lower conductor cross arm (7) on a horizontal plane intersect with each other.

2. A double-circuit cross-over transmission tower as claimed in claim 1, characterized in that: The projections of the upper conductor cross arm (5) and the lower conductor cross arm (7) on a horizontal plane are in a cross structure.

3. A double-circuit cross-over transmission tower as claimed in any one of claims 1 to 2, characterized in that: The upper tower head section (31) is provided with at least two upper ground wire hanging points (41) and three upper conductor hanging points (50); The lower tower head section (32) is provided with at least two lower ground wire hanging points (61) and three lower conductor hanging points (70).

4. A double-circuit cross-over transmission tower as claimed in claim 3, characterized in that: The upper conductor hanging point (50) comprises a first upper conductor hanging point (51) and a second upper conductor hanging point (52) respectively arranged at two ends of the upper conductor cross arm (5), and further comprises a third upper conductor hanging point (53) whose connection line with the first upper conductor hanging point (51) and the second upper conductor hanging point (52) on a vertical plane forms a triangle structure; The lower conductor hanging point (70) comprises a first lower conductor hanging point (71) and a second lower conductor hanging point (72) respectively arranged at two ends of the lower conductor cross arm (7), and also comprises a third lower conductor hanging point (73) whose connection line with the first lower conductor hanging point (71) and the second lower conductor hanging point (72) on a vertical plane forms a triangle structure.

5. A double-circuit cross-over transmission tower as claimed in claim 4, characterized in that: Two upper ground wire hanging points (41) are respectively provided at two ends of the upper ground wire bracket (4); two lower ground wire hanging points (61) are respectively provided at two ends of the lower ground wire bracket (6); Two of the first upper conductor hanging points (51), the second upper conductor hanging points (52), and the third upper conductor hanging points (53) are respectively provided along the length direction of the upper transmission line, and the two upper ground wire hanging points (41) located at the same end of the upper ground wire support (4) are arranged along the length direction of the upper transmission line; Two of the first lower conductor hanging points (71), the second lower conductor hanging points (72) and the third lower conductor hanging points (73) are respectively provided along the length direction of the lower transmission line, and the two lower ground wire hanging points (61) located at the same end of the lower ground wire support (6) are arranged along the length direction of the lower transmission line.

6. A double-circuit cross-over transmission tower as claimed in claim 5, characterized in that: The height position of the third upper wire hanging point (53) is higher than the height positions of the first upper wire hanging point (51) and the second upper wire hanging point (52), and the height position of the third lower wire hanging point (73) is higher than the height positions of the first lower wire hanging point (71) and the second lower wire hanging point (72).

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