CN204299268U - A kind of mixed pressure three loop steel tube tower - Google Patents

Abstract

The utility model discloses a mixed pressure three-circuit steel pipe tower. It includes a tower head, a tower body and tower legs. The tower head includes a top frame cross arm and a four-layer cross arm located below the top frame formwork. There is a ground wire hanging point at the end of the top frame cross arm. The top frame cross arm is also provided with wire hanging points, the wire hanging points and the ground wire hanging points are arranged in a staggered manner, and the three-layer cross arms below the top frame cross arms are all provided with wire hanging points at both ends of the cross arms. The lowermost wire cross arm is a single-side cross arm, which is only distributed on one side of the steel pipe tower, and a special wire hanging point is arranged on it. The utility model has the advantages of reasonable layout and more compact and concise layout of the tower head; at the same time, by reducing the height of the whole tower, the wind load on the tower body is effectively reduced, and the comprehensive economic index is more superior; High efficiency, saving land resources, protecting the environment and so on.

Description

A mixed pressure three-circuit steel pipe tower

technical field

The utility model relates to a line iron tower, in particular to a mixed-pressure three-circuit steel pipe tower.

Background technique

With the development of our country's society, economy and environmental protection, the requirements for transmission line corridors are increasing day by day. It has become inevitable for transmission lines to adopt multi-circuit line technology on the same tower, especially for areas with developed economy, expensive land and dense housing. Obvious economic and social benefits. Generally, the structural arrangement commonly used in multi-circuit towers has the following characteristics:

(1) The ground wire cross-arm and wire cross-arm of the conventional multi-circuit tower are controlled by the distance between the ground wire and the wire. Compared with the integrated cross-arm on the top frame, there are more cross-arms, which leads to a larger weight of the tower;

(2) The conductors of each phase are mostly arranged vertically, so the height of the whole tower is higher, which increases the wind load effect of the tower body and increases the steel consumption;

(3) The ratio of the whole tower height to the root opening of conventional multi-circuit towers is generally 4-6. Due to the high height of the whole tower, the root opening is relatively large, and the applicability to areas with limited land occupation of urban lines is not strong.

(4) The voltage level of each circuit of the conventional multi-circuit tower is generally the same, which leads to the need to erect an additional iron tower if there is a mixed voltage on the line, which increases the width of the line corridor and greatly increases the project cost.

(5) There are generally two types of hanging points for conventional multi-circuit tower wires: I-string and V-string. The V-string method is characterized by a longer cross-arm length and a larger line corridor width.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a mixed-pressure three-circuit steel pipe tower that can reduce the height of the tower and meet the specification requirements of transmission lines.

A mixed-pressure three-circuit steel pipe tower includes a tower head, a tower body and tower legs. The tower head includes a top frame cross arm and a four-layer cross arm located below the top frame formwork. There is a ground wire hanging point at the end, and a wire hanging point is also set on the cross arm of the top frame. The wire hanging point and the ground wire hanging point are arranged in a staggered arrangement. The two ends of the wire are provided with hanging points, and the wire cross arm on the bottom layer is a single-side cross-arm, which is only distributed on one side of the steel pipe tower, and a wire hanging point is set on it, and the single-side cross-arm is connected to the adjacent upper The cross arms of the first floor form a voltage-level loop, and the cross arms on the upper two floors and the top cross arm form a higher-level voltage loop.

The mixed-pressure three-circuit steel pipe tower of the utility model, through the ingenious structural arrangement, on the one hand combines the ground wire cross arm and the top layer wire cross arm into one in the prior art, and ensures that the ground wire and the wire meet the safety regulations. , can greatly reduce the tower height of the entire steel pipe tower, thereby avoiding lightning strikes, storms and other hazards, and can also reduce the overall cost of the mixed-pressure three-circuit steel pipe tower.

The staggered arrangement of the hanging points of the ground wire of the cross-arm of the top frame and the hanging points of the wires is either spatially staggered or planarly staggered.

The spatial stagger refers to the stagger in all three directions of space, and the plane stagger refers to the stagger in the directions of the two coordinate axes of the coordinates.

The longitudinal section shape of the cross-arm of the top frame is an inverted trapezoid, the lower bottom of the trapezoid is located at the upper part, the upper bottom of the trapezoid is located at the bottom, the ground wire hanging points are set at the two outer ends of the trapezoidal lower bottom, and the wire hanging points are set at the bottom of the trapezoid. The upper base of an isosceles trapezoid or its two sides.

The longitudinal section of the tower body of the steel pipe tower is an isosceles trapezoidal structure, the width of the upper bottom is 1750mm-2000mm, and the width of the lower bottom is 6292mm-7000mm

The width of the lower part of the steel pipe tower leg is 6292mm-7000mm.

Since the utility model combines the ground wire cross arm on the top and the wire cross arm of the top frame into one, the height of the entire steel pipe tower can be reduced, and the root opening of the tower legs can be set at a smaller value, thereby achieving The purpose of reducing the land area is to realize the construction of a narrow base steel pipe tower.

The main material of the tower body is composed of multi-section steel pipes, and the multi-section steel pipes are connected by butt welding flanges. The oblique material and auxiliary materials of the tower body are equilateral angle steel or steel pipes, and the main materials are connected by gusset plates. .

The high-voltage level circuits on the cross arms on the upper two floors and the cross arms on the top frame are arranged in a vertical arrangement; the circuits on the lower two floors are arranged in an inverted triangle.

The higher level voltage circuit on the upper level is 500kV, and the voltage level circuit on the lower level is 220kV.

In summary, the utility model has the following advantages compared with the prior art:

The mixed pressure three-circuit steel pipe tower of the utility model,

(1) Optimize the layout of the ground wire support: on the premise of meeting the electrical insulation coordination and lightning protection design requirements, use the vertical height and horizontal offset of the hanging string to meet the corresponding electrical clearance requirements, and the optimized top frame will connect the ground wire The cross arm of the upper phase conductor is arranged on the same cross arm. Compared with the traditional tower with independent ground wire support, the force transmission path of the structural system is clearer and more direct, which effectively reduces the effect of the ground wire load.

(2) The layout of the cross arm is more reasonable: the two circuits of the high voltage level on the upper layer are arranged vertically, and the voltage levels on the lower layer are arranged in an inverted triangle, which can reduce the height of the whole tower and reduce the cost of the body compared with the traditional vertical arrangement of each circuit.

(3) Narrow base tower structure is adopted, which occupies a small area and the width of the corridor is small, which is suitable for areas with limited land occupation of urban lines.

(4) Strong applicability: through the mixed pressure arrangement, on the premise that the power frequency electric field, power frequency magnetic field, radio interference and audible noise interference all meet the relevant requirements, the optimized and improved mixed pressure three-circuit narrow-base steel pipe tower can Two different voltage levels are arranged on the same tower, which effectively saves the width of the corridor and has strong applicability.

(5) Reduced land occupation: The vertical arrangement of conductors in I series can effectively reduce the length of the cross arm, reduce the width of the corridor, and reduce the occupied area of overhead lines.

(6) The comprehensive economic indicators are more superior: by integrating the ground wire and wires on a cross arm, the height of the ground wire support is reduced; the low-voltage circuit is arranged in an inverted triangle, which reduces the height of the entire tower; the main material of the steel pipe is adopted, Utilizing its superior wind resistance performance, the effect of wind load can be reduced. The above methods can effectively reduce the effect of external load and reduce the overall cost.

Description of drawings

Figure 1 is a schematic structural diagram of a mixed-pressure three-circuit steel pipe tower according to an embodiment of the utility model.

Explanation of labels A1-left ground wire hanging point, A2-right ground wire hanging point, B1-left upper phase wire, B2-right upper phase wire, C1-500kV left middle phase wire, C2-500kV right side Middle phase wire, D1-500kV left lower phase wire, D2-500kV right lower phase wire, E1-220kV wire hanging point 1, E2-220kV wire hanging point 2, E3-220kV wire hanging point 3, 1- steel pipe main Material, 2-butt welding flange.

detailed description

Below in conjunction with embodiment the utility model is described in more detail.

Example 1

As shown in Figure 1, the utility model is specifically illustrated by taking 500kV and 220kV mixed pressure three-circuit narrow-base steel pipe towers as examples, including tower head, tower body and tower legs. The tower head is composed of a top frame cross arm and a four-layer conductor cross arm. The left and right symmetrical top frame cross arms are used to set the ground wire hanging points (A1 and A2) and the 500kV upper phase wire hanging points (B1 and B2). The left and right symmetrical second layer cross arms are used to set the 500kV conductor hanging points (C1 and C2), the left and right symmetrical third layer cross arms are used to set the 500kV wire hanging points (D1 and D2), and the left and right symmetrical fourth layer cross arms It is used to set the hanging points of 220kV conductors (E1 and E2), and the fifth layer of crossarm is used to set the hanging points of 220kV lower phase conductors.

The main material is made of Q420B or Q345B steel pipe (number 1 in the figure), and each section is connected by a high-neck butt welding flange (number 2 in the picture); the oblique material and auxiliary material are equal-edge angle steel or steel pipe of Q235B or Q345B , connected with the main material through the gusset plate.

The tower legs are flat legs, and the root opening (the width of the lower end of the leg) is 6292mm-7000mm.

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.

The parts not described in this embodiment are the same as the prior art.

Claims (7)

1. A mixed pressure three-circuit steel pipe tower, comprising a tower head, a tower body and a tower leg, is characterized in that: the tower head includes a top frame cross arm and a four-layer cross arm positioned below the top frame formwork, There is a ground wire hanging point at the end of the top frame cross arm, and a wire hanging point is also set on the top frame cross arm. The wire hanging point and the ground wire hanging point are arranged in a staggered arrangement. The cross-arms are equipped with wire hanging points at both ends of the cross-arm. The wire cross-arm at the bottom is a single-side cross-arm, which is only distributed on one side of the steel pipe tower. There is a wire hanging point on it, and the single-side cross-arm The cross arm and the cross arm on the adjacent upper layer form a voltage-level loop, and the cross arms on the upper two layers and the top cross arm form a higher-level voltage loop. 2. The mixed-pressure three-circuit steel pipe tower according to claim 1, characterized in that: the staggered arrangement of the hanging points of the cross-arm ground wires on the top frame and the hanging points of the wires is either spatially staggered or planarly staggered . 3. The mixed-pressure three-circuit steel pipe tower according to claim 2, characterized in that: the longitudinal section shape of the cross-arm of the top frame is an inverted trapezoid, the lower bottom of the trapezoid is located at the upper part, and the upper bottom of the trapezoid is located at the bottom, The ground wire hanging point is arranged on the two outer ends of the lower bottom of the trapezoid, and the wire hanging point is arranged on the upper bottom of the isosceles trapezoid or its two waists. 4. The mixed pressure three-circuit steel pipe tower according to claim 3, characterized in that: the longitudinal section of the tower body of the steel pipe tower is an isosceles trapezoidal structure, the width of the upper bottom is 1750mm-2000mm, and the width of the lower bottom is 6292mm-7000mm. 5. The mixed-pressure three-circuit steel pipe tower according to claim 4, characterized in that: the width of the lower part of the legs of the steel pipe tower is 6292mm-7000mm. 6. The mixed-pressure three-circuit steel pipe tower according to claim 5, characterized in that: the main material of the tower body is composed of multi-section steel pipes, and the multi-section steel pipes are connected by butt welding flanges, and the oblique The main material and auxiliary material are equal-edge angle steel or steel pipe, and are connected with the main material by gusset plate. 7. The mixed pressure three-circuit steel pipe tower according to claim 6, characterized in that: the high-voltage level circuits on the upper two-story cross arm and the top frame cross-arm are arranged in a vertical arrangement; Arranged in an inverted triangle.