CN106836935A - A kind of upper font E glass-epoxies cross-arm tower - Google Patents

Abstract

The invention discloses an E-shaped E glass fiber epoxy resin cross-arm tower, which includes tower legs, tower body and tower head connected in sequence; and three groups of cable-stayed insulators and post insulators arranged on the side of the tower Composed of composite cross-arms, three groups of cross-arms are distributed on both sides of the tower in an upward shape; each group of composite cross-arms includes two cable-stayed insulators, two post insulators and steel hanging point devices; the cable-stayed insulators One end is connected to the tower body, the other end is connected to one end of the post insulator, the other end of the post insulator is connected to the tower body, and the connection point is located at the connection point between the cable-stayed insulator and the tower body. Below; the end connecting the post insulator and the cable-stayed insulator is provided with a steel hanging point device for connection; under the premise of ensuring the distance between the wire and the ground, the tower structure provided by the present invention reduces the height of the tower and reduces the line corridor Width, thereby reducing the weight of the tower and the foundation of the tower.

Description

An E-shaped E-glass fiber epoxy resin cross-arm tower

【Technical field】

The invention relates to the technical field of power transmission lines, in particular to an upper-shaped E-glass fiber epoxy resin (composite material for short) cross-arm tower.

【Background technique】

Please refer to Figure 1. At present, the structure of transmission towers is mainly made of steel, which consumes a lot of steel and mineral energy, causing serious pollution to the ecological environment. In addition, the line tower adopts an all-steel structure, which has problems such as heavy weight, difficulty in construction, transportation, and operation and maintenance. Therefore, the use of new tower materials has become a new trend in the field of transmission towers.

Due to the advantages of high strength, light weight, corrosion resistance, easy processing, designability and good insulation performance, composite materials (FRP) have attracted more and more attention from the engineering community, especially for engineering applications in the power transmission and transformation industry. It is one of the ideal materials to replace steel to build transmission tower structures. In recent years, with the further reduction of the cost of composite materials and the continuous improvement of technology, domestic research on composite towers has increased and gradually matured.

For composite material towers, previous research at home and abroad mainly focused on the "single-pole type". , the bearing capacity of a single-pole structure is difficult to meet the strength and stiffness requirements of high-voltage and heavy-load towers. Therefore, composite towers for UHV and EHV transmission lines should adopt a "lattice" structure. However, the lattice-type composite material pole tower has a floating potential in the middle of the cross-arm, and the length of the cross-arm is relatively long; the all-steel structure is adopted, and the load has a large bending and torsion effect on the pole tower, which affects the stability and use of the pole tower structure. life.

【Content of invention】

The purpose of the present invention is to provide an E-shaped E glass fiber epoxy resin cross-arm tower to reduce the bending and torsion effect of the wire load on the tower, thereby reducing the weight of the tower, saving materials, and effectively reducing the construction cost.

To achieve the above object, the present invention is achieved by taking the following technical solutions:

An E-shaped E-glass fiber epoxy resin cross-arm tower, including tower legs, tower body and tower head connected in sequence; Three groups of cross-arms are distributed on both sides of the tower body in an upward shape; each group of composite cross-arms includes two cable-stayed insulators, two post insulators and steel hanging point devices for connection; one end of the cable-stayed insulators is connected to the The tower body is connected, the other end is connected to one end of the post insulator, the other end of the post insulator is connected to the tower body, and the connection point is located below the connection point between the cable-stayed insulator and the tower body; One end of the post insulator connected to the cable-stayed insulator is provided with a steel hanging point device for connection; the connection point between the post insulator and the cable-stayed insulator is not lower than the connection point between the post insulator and the tower body.

Further, the cable-stayed insulator is a flexible part, and its two ends are respectively connected to the steel hanging point device and the tower body bolts through U-shaped ring connectors.

Further, the post insulator is a rigid part, and the post insulator includes a composite material component, steel sleeves at both ends of the composite material component, and a cross-shaped plug-in connector; the two steel sleeves at the ends of the composite material are connected to the steel hanging point device by bolts , two root steel sleeves of composite material and cross-type inserting plate connectors are connected to the tower body through bolts; one end thereof is connected to the tower body with a steel plate.

Further, the connection point between the cable-stayed insulator and the tower body is located in the middle of the tower body or on the outer side of the tower body.

Further, the connection point between the post insulator and the tower body is located in the middle of the tower body or on the outer side of the tower body.

Further, the cable-stayed insulators or the post insulators are two in front and back, and the steel hanging point device is connected to the two cable-stayed insulators or the two post insulators in an approximately "V" shape.

Further, both the cable-stayed insulator and the post insulator are equipped with sheds; the upper ends of the cable-stayed insulator and the post insulator are provided with voltage equalizing rings.

Further, the components of the composite cross-arm within the range affected by the electrical gap and insulation distance are all composite material components, and the material of the composite material components is glass fiber reinforced plastic.

The upper-shaped E glass fiber epoxy resin cross-arm tower of the present invention includes tower legs, tower body and tower head connected in sequence; it also includes three groups of composite materials composed of cable-stayed insulators and post insulators arranged on the side of the tower Cross arm, using composite material cross arm to reduce the bending and torsion effect of the load on the tower, and at the same time make up for the lack of material stiffness through structural rigidity, increasing the stiffness and bearing capacity of the composite material tower, which is convenient for high-voltage, ultra-high voltage and ultra-high voltage transmission lines The promotion and application in the project greatly reduces the width of the corridor, reduces the weight of the tower, saves materials, and effectively reduces the construction cost.

Further, the steel bushing node, the U-shaped ring connector and the cross-shaped plug-in connector are respectively solidified and connected to the ends of the post insulator and the tensile composite insulator through resin. The ground wire bracket of the upper-shaped E-glass fiber epoxy resin cross-arm tower is connected to the ground wire, and the ground wire bracket is connected to the steel structure of the tower body to realize the grounding lead and achieve the purpose of lightning protection; by ensuring that the wire hanging point is connected to any The distance between the metal parts meets the insulation distance to achieve the purpose of tower head insulation; the space truss system is composed of various components to transfer load; the shed on the surface of the composite material component is used to increase the creepage ratio of the cross arm; the electric field is improved through the equalizing ring distributed.

Compared with the prior art, the present invention also has the following advantages:

1. Reduced corridor width: Compared with conventional angle steel wineglass towers, the corridor width is reduced by 21.2m, reaching 52%, which is conducive to reducing the amount of house demolition and saving land resources;

2. Low cost: Compared with the conventional angle steel wine glass tower, the weight of the iron tower is reduced by about 15.22%, the amount of foundation concrete is reduced by 9.3%, and the comprehensive cost is reduced by about 6%;

3. Beautiful style: the improved upturned cross-arm upper font scheme is adopted, with beautiful style and simple structure.

4. Reduce the probability of wind-bias flashover accidents: due to the use of the insulation properties of composite materials, the suspension insulator strings of the transmission tower structure are canceled, which reduces the probability of wind-bias pollution flashover accidents on transmission lines and improves the level of safe operation of the lines;

5. Convenient grounding: through reasonable arrangement, the steel structure is continuous, and the purpose of grounding and lightning protection is realized.

6. Low operation and maintenance costs: Since the composite material has the characteristics of corrosion resistance, high and low temperature resistance, and low possibility of theft, the maintenance cost of the line is reduced.

【Description of drawings】

Fig. 1 is a structural schematic diagram of a traditional all-steel goblet type transmission tower;

Fig. 2 is the monoline diagram of the font E glass fiber epoxy resin cross-arm tower of the present invention;

Fig. 3 is the electrical working principle diagram of the font E glass fiber epoxy resin cross-arm tower of the present invention;

Fig. 4a is the front view of the cross-arm of the E-shaped glass fiber epoxy resin cross-arm tower of the present invention;

Figure 4b is a top view of the cross-arm of the E-shaped glass fiber epoxy resin cross-arm tower of the present invention;

In the figure: post insulator 1, cable-stayed insulator 2, ground wire support 3, tower body 4, tower leg 6, steel hanging point device 10, first steel bushing 11, second steel bushing 12, cross-shaped plug-in connection Part 13, pressure equalizing ring 14, U-shaped ring connector 15.

【detailed description】

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 2 , the single-line diagram of the upper-shaped E-glass fiber epoxy resin cross-arm tower of the present invention, including three sets of composite material cross-arms, two sets of steel structure ground wire supports 3, tower body 4, and tower legs 6.

Three sets of composite material cross arms are arranged on the side of the tower body 4, and three sets of composite cross arms composed of cable-stayed insulators 2 and post insulators 1 are arranged in an upward shape along the axis of the tower body. Each set of composite material cross arms includes two cable-stayed insulators 2 , two post insulators 1 and a set of steel hanging point devices 10 .

One end of the cable-stayed insulator 2 is connected to the tower body 4, the other end is connected to one end of the post insulator 1, the other end of the post insulator 1 is connected to the tower body 4, and its connection point is located at the Below the connection point between the cable-stayed insulator 2 and the tower body 4; one end of the connection between the cable-stayed insulator 1 and the cable-stayed insulator 2 is provided with a steel hanging point device 10 for connection; the cable-stayed insulator 1 and the cable-stayed The connection point of the insulator 2 is not lower than the connection point between the post insulator 1 and the tower body 4 . The connection point between the post insulator 1 and the tower body 4 and the connection point between the cable-stayed insulator 2 and the tower body 4 are located in the middle of the tower body 4 or on the outer side of the tower body 4 .

Please refer to Fig. 4a and Fig. 4b, the post insulator 1 comprises a composite material component, and the two ends of the composite material component are provided with a first steel bushing 11, a second steel bushing 12 and a cross-shaped board connector 13 respectively.

The composite material cross arm includes two post insulators 1, the second steel casing 12 of the two post insulators 1 and the cross-shaped plate connector 13 are connected and fixed with the steel hanging point device 10 by bolts; the second steel casing 12 is fixed Pressure equalizing ring 14 is arranged. The steel bushings 11 of the two post insulators 1 and the cross-shaped plug-in board connector 13 are fixedly connected to the tower body 4 . The steel hanging point device 10 and the two post insulators 1 are approximately in the shape of a "V" after being connected.

Both ends of the composite cable-stayed insulator 2 are fixedly connected to the steel hanging point device 10 and the tower body 4 through U-shaped ring connectors 15 .

Composite post insulator 1 and composite cable-stayed insulator 2 are made of FRP.

The steel hanging point device 10 includes a steel pipe, several connecting plates, two hanging plates and stiffening plates.

Both the steel structure ground wire support 3 and the tower body 4 are composed of several angle steel members. The steel structure ground wire support 3 is connected to the ground wire, the steel structure ground wire support is connected to the tower body 4 , and the steel structure ground wire support is electrically connected to the tower body 4 .

The components within the range affected by the electrical clearance and insulation distance of the composite cross-arm are all composite material components, and the material of the composite material components is glass fiber reinforced plastic.

According to the above-mentioned technical scheme, the upper-shaped E-glass fiber epoxy resin cross-arm tower is solidified and connected to the composite joints, end flanges, U-ring connectors and cross-shaped board connectors by resin. Material post insulators and composite cable-stayed insulator ends, and bolts are used to connect the composite material post insulators and composite cable-stayed insulators into a whole to form a composite material cross arm. The lack of material stiffness is made up for by the structural stiffness, and the stiffness and bearing capacity of the composite material tower are increased, which is convenient for popularization and application in high-voltage, ultra-high-voltage and ultra-high-voltage transmission line projects.

(1) End connectors of composite components

The end connectors of composite members are all steel structures, and the steel connectors—steel sleeve joints, U-ring connectors, and cross-shaped board connectors are respectively solidified and connected to composite post insulators, composite oblique connectors, etc. by resin. Pull the insulator terminal.

(2) Composite insulation cross arm

Two composite material post insulators, two composite material cable-stayed insulators and a set of wire hanging point devices are connected as a whole by bolts to form a composite material insulating cross arm.

(3) The force principle of the upper-shaped composite cross-arm tower

The upper-shaped composite cross-arm tower is a space truss body system. It uses the insulation properties of the composite material itself to achieve the purpose of insulation. At the same time, the creepage ratio of the cross-arm is increased through the shed on the surface; electric field distribution. At the same time, the wire load and the wind load of the tower body are converted into the axial load of the upper-shaped composite cross-arm tower components, and the load is transmitted to the tower body. The cross arm and the tower body, the pressure is transmitted to the tower body by two composite material post insulators; and the tension is transmitted to the tower body by two composite material cable-stayed insulators.

(4) Lightning protection and grounding of the upper-shaped composite cross-arm tower

The grounding of the upper-shaped composite cross-arm tower is realized through the external steel structure components. The steel structure ground wire support 3 is connected to the ground wire, and the steel structure ground wire support 3 is connected to the tower body 4 to achieve the purpose of grounding and lightning protection.

(5) Insulation configuration of the upper-shaped composite cross-arm tower

The upper-shaped composite cross-arm tower achieves the purpose of tower head insulation by ensuring that the distance from the wire hanging point to any metal parts meets the insulation distance. The insulation distance is mainly determined by the insulation configuration for different voltages, altitudes and pollution levels. At the same time, within the scope of the air gap circle affected by the operating overvoltage and air gap, composite material components are used to achieve the purpose of insulation, as shown in Figure 3.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple deduction or replacement can also be made, all of which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims (8)

1. a kind of font E-glass fiber epoxy resin cross-arm tower is characterized in that, comprises tower leg (6), tower body (4) and tower head connected in sequence; It also includes three sets of composite material cross arms composed of cable-stayed insulators (2) and post insulators (1) arranged on the side of the pole tower. The poles are arranged in an upward shape along the axis of the tower body; each group of composite cross arms includes two cable-stayed insulators (2) and two post insulators (1) and steel hanging point devices (10) for connection; the cable-stayed insulators ( 2) one end is connected to the tower body (4), the other end is connected to one end of the post insulator (1), and the other end of the post insulator (1) is connected to the tower body (4), which is connected to The point is located below the connection point between the cable-stayed insulator (2) and the tower body (4); one end of the connection between the post insulator (1) and the cable-stayed insulator (2) is provided with a steel hanging point device for connection (10); the connection point between the post insulator (1) and the cable-stayed insulator (2) is not lower than the connection point between the post insulator (1) and the tower body (4). 2. The upper-shaped E-glass fiber epoxy resin cross-arm tower according to claim 1, characterized in that, the cable-stayed insulator (2) is a flexible part, and the two ends are respectively connected to the steel through U-shaped ring connectors. Point device (10) and tower body (4) bolt connection. 3. The upper-shaped E glass fiber epoxy resin cross-arm tower as claimed in claim 1, characterized in that, the post insulator (1) is a rigid part, and the post insulator (1) includes a composite material component, a composite material component The steel sleeves at both ends and the cross-type plug connectors (13); the two composite material end steel sleeves are connected with the steel hanging point device (10) bolts, and the root steel sleeves of the two composite materials and the cross-type plug The plate connector (13) is connected to the tower body (4) by bolts; one end thereof is connected to the tower body (4) with a steel plate. 4. The upper-shaped E-glass fiber epoxy resin cross-arm tower as claimed in any one of claims 2 to 3, characterized in that, the connection point between the cable-stayed insulator (2) and the tower body (4) Located in the middle of the tower body (4) or the outer side of the tower body (4). 5. The upper-shaped E-glass fiber epoxy resin cross-arm tower according to any one of claims 2 to 3, characterized in that, the connection point between the post insulator (1) and the tower body (4) is located at The middle part of the tower body (4) or the outer side of the tower body (4). 6. The upper-shaped E-glass fiber epoxy resin cross-arm tower as claimed in any one of claims 2 to 3, characterized in that, the cable-stayed insulators (2) or the post insulators (1) are front and rear Two, the steel hanging point device (10) is approximately in a "V" shape after being connected to the two cable-stayed insulators (2) or the two post insulators (1). 7. The upper-shaped E glass fiber epoxy resin cross-arm tower according to claim 1 is characterized in that, on the described cable-stayed insulator (2) and the post insulator (1), there are sheds; Both the upper ends of the insulator (2) and the post insulator (1) are provided with voltage equalizing rings. 8. The upper-shaped E-glass fiber epoxy resin cross-arm tower according to claim 1, wherein the composite cross-arms all adopt composite material members in the range affected by electric clearance and insulation distance, and the composite Material components are made of fiberglass.