Single-layer cross arm same-tower double-loop tangent tower for drilling

Abstract

The single-layer cross arm same-tower double-loop tangent tower comprises a tower head, a tower body, tower legs and single-layer wire cross arms, the tower head, the tower body and the tower legs are arranged in a square shape, the single-layer wire cross arms are symmetrically distributed on the left side and the right side of the tower head, and the whole tower is arranged in a T shape; three-phase wires of a power transmission line are arranged on the wire cross arm on each side and are horizontally arranged at intervals in the length direction of the wire cross arm, and each phase wire is provided with a wire suspension string hanging point located in the middle of the wire cross arm. A ground wire suspension string hanging point is arranged at the end part of the wire cross arm on each side; the upper portions of the two sides of the tower head are each provided with a ground wire support, and each ground wire support is provided with a ground wire suspension string hanging point. According to the single-layer cross arm same-tower double-loop tangent tower, when a conventional iron tower drills over, the vertical arrangement mode of the wires is changed into the horizontal arrangement mode, the height of the tangent tower can be reduced, and selection of drilling over gears is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultra-high voltage overhead transmission lines, in particular to a single-layer cross-arm same-tower double-circuit straight tower for drilling and crossing. Background Art

[0002] Conventional AC 220 kV transmission line designs typically feature a single-circuit, linear tower with one ground crossarm and three conductor crossarms. The six-phase conductors are arranged on the upper, middle, and lower conductor crossarms. The lower crossarm is calculated as a minimum of 18 meters. Taking into account the inter-layer spacing between the lower, middle, upper, and ground conductor crossarms, the total height of the tower reaches 35 meters. For 220 kV transmission lines with overpasses, the lower conductor is calculated as a minimum of 6.5 meters. Similarly, taking into account the inter-layer spacing between the lower, middle, upper, and ground conductors, the ground conductor height reaches 24 meters for the double-circuit tower.

[0003] When a 220 kV double-circuit transmission line on the same tower needs to drill over a 500 kV transmission line or other important facilities, the height of the straight tower and the ground wire greatly restricts the selection of the drilling and crossing points. Changing the position of the drilling and crossing points or modifying the 500 kV transmission line being drilled over will affect the technical and economic feasibility of the entire 220 kV transmission line. For example, the path plan is not reasonable enough, the modification plan is more complicated, the economic cost is high, and the power supply reliability of the original transmission line is affected. Utility Model Content

[0004] The utility model aims to solve the problem that the height of the straight tower and the ground wire used for drilling and crossing have greatly restricted the selection of the drilling and crossing gear, the path plan is not reasonable, the transformation plan is more complicated, the economic cost is relatively high, and the power supply reliability of the original transmission line is affected. The utility model thus provides a single-layer cross-arm and double-circuit straight tower with the same tower for drilling and crossing, which realizes the coordinated unity of reliability, economy, advancement and flexibility.

[0005] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a single-layer cross-arm double-circuit straight tower with the same tower for drilling and crossing, which is characterized by comprising a tower head, a tower body, tower legs and a single-layer conductor cross-arm. The tower head, the tower body and the tower legs adopt a square layout, and the single-layer conductor cross-arms are symmetrically distributed on the left and right sides of the tower head, and the whole tower is arranged in a T shape; the three-phase conductors of a transmission line are arranged on each side of the conductor cross-arm, and are arranged horizontally at intervals along the length direction of the conductor cross-arm. A conductor suspension string hanging point is set for each phase conductor, which is located in the middle of the conductor cross-arm; a ground wire suspension string hanging point is set at the end of the conductor cross-arm on each side; a ground wire bracket is set on the upper part of each side of the tower head, and each ground wire bracket is set with a ground wire suspension string hanging point.

[0006] Furthermore, the total height of the straight tower is controlled below 17 meters, and the ground wire height of the drilling gear is controlled below 10 meters.

[0007] The utility model adopts a single-layer cross-arm double-circuit straight tower with the same tower. When drilling over a conventional iron tower, the vertical arrangement of the conductors is changed to a horizontal arrangement. This can reduce the height of the straight tower. The height of the three-phase conductors to the ground of the drilled-over section is changed from 19.5 meters, 13 meters and 6.5 meters to 6.5 meters, 6.5 meters and 6.5 meters. The height of the ground wire of the drilled-over section is reduced from 24 meters to 10 meters. For example, there is an existing 500 kV transmission line. Now it is necessary to build a new 220kV double-circuit transmission line on the same tower. The height of the conductor of the conventional 500 kV transmission line needs to be guaranteed to be above 30 meters above the ground (24 meters of the ground wire height of the 220 kV transmission line + 6 meters of safety distance). Now, the height of the conductor of the 500 kV transmission line to the ground needs to be above 11 meters, which greatly facilitates the choice of drilling over the section. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure of the utility model;

[0009] Among them: 1. Tower head; 2. Tower body; 3. Tower leg; 4. Conductor cross arm; 5. Ground wire bracket; 6. Conductor suspension string hanging point, as shown by “▼”; 7. Ground wire suspension string hanging point, as shown by “●”. DETAILED DESCRIPTION

[0010] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a single-layer cross-arm double-circuit linear tower for drilling and crossing in conjunction with the accompanying drawings.

[0011] Reference Figure 1 The present utility model's linear tower consists of a tower head 1, a tower body 2, and tower legs 3, arranged in a T-shape. The tower body adopts a typical square layout, with single-layer conductor crossarms 4 symmetrically located on either side of the tower head. The total height of the linear tower can be kept below 17 meters, and the height of the ground wire for drilling and overrunning can be controlled below 10 meters.

[0012] Each conductor crossarm on the linear tower of this invention carries three-phase conductors for a single transmission line, arranged horizontally and spaced apart. Each phase is provided with a conductor suspension string point 6 located in the middle of the conductor crossarm 4. A ground wire suspension string point 7 is located at the end of each conductor crossarm 4. A ground wire bracket 5 is located on each upper side of the tower head 1, each with a ground wire suspension string point 7.

[0013] The straight tower is equipped with four ground wires, two of which are located on the left and right ground wire brackets, and the other two are located on the outermost sides of the conductor crossarms. Each ground wire is provided with a ground wire suspension string hanging point.

Claims

1. A single-layer cross-arm double-circuit linear tower for drilling and crossing, characterized by: It includes a tower head, tower body, tower legs and single-layer conductor crossarms. The tower head, tower body and tower legs adopt a square layout, and the single-layer conductor crossarms are symmetrically distributed on the left and right sides of the tower head. The whole tower is arranged in a T shape; three-phase conductors of a transmission line are arranged on the conductor crossarm on each side, and are arranged horizontally at intervals along the length of the conductor crossarm. A conductor suspension string hanging point is set for each phase conductor, which is located in the middle of the conductor crossarm; a ground wire suspension string hanging point is set at the end of the conductor crossarm on each side; a ground wire bracket is set on the upper part of each side of the tower head, and each ground wire bracket is set with a ground wire suspension string hanging point.

2. The single-layer cross-arm double-circuit linear tower for drilling and crossing according to claim 1, characterized in that: The total height of the straight tower is controlled below 17 meters, and the ground wire height of the drilling and overtaking gear is controlled below 10 meters.

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