CN105464446A - Double-loop power transmission tower - Google Patents

Abstract

The invention provides a double-loop power transmission tower, which comprises a tower body, a tower head and a foundation, wherein the tower body is in vertical arrangement; the tower head is arranged at the upper end of the tower body; the foundation is arranged at the lower end of the tower body; the tower head comprises a tower window, a ground wire support frame and a loop lead; the ground wire support frame is arranged at the two ends of the upper part of the tower window; the loop lead is arranged in the tower window; and the foundation comprises a concrete foundation and a bearing table arranged at the upper end of the concrete foundation. The double-loop power transmission tower provided by the invention has the advantages that the transmission passage width is reduced; the power transmission capability is improved; the torsional resistance of an electric tower is enhanced; the land resources are saved; and the production and maintenance cost is reduced.

Description

A double circuit transmission tower

technical field

The invention relates to power transmission equipment, in particular to a double-circuit power transmission tower.

Background technique

With the continuous and rapid development of my country's economy, the requirements for straight towers with double-circuit AC lines on the same tower with a voltage level of 220kV and above continue to increase. Therefore, it is necessary to provide a double-circuit transmission tower to reduce the width of the transmission corridor, improve the power transmission capacity, save land resources and reduce production and maintenance costs.

The inventor has found through long-term observation and research that a double-circuit transmission tower adopts a dry-shaped tower with two circuits distributed on both sides of the tower body and three-phase conductors arranged horizontally or vertically (the tower head is shown in Figure 7 and Figure 8) Or two single-circuit inverted triangles are respectively placed on the T-shaped tower on both sides of the tower body (as shown in Figure 9). There are the following problems: 1. The corridors of the double-tower window-type towers have a large width, a large amount of steel is used, and the construction cost is relatively high, which is not enough for energy saving and environmental protection. 2. The T-shaped tower has long cross arms and large torque. For high-voltage transmission towers, due to the large line load, the torsional performance of the tower is not reliable enough.

Therefore, it is necessary to provide a double-circuit power transmission tower to reduce the width of the transmission corridor, improve the power transmission capacity, enhance the torsion resistance of the power tower, save land resources and reduce production and maintenance costs.

Contents of the invention

To solve the deficiencies of the prior art, the present invention provides the following technical solutions: a double-circuit power transmission tower is provided, the power transmission tower includes a vertically arranged tower head and foundation,

The tower head includes a tower window, ground wire supports arranged at both ends of the upper part of the tower window, and loop wires arranged in the tower window;

The foundation includes a concrete foundation and a cap set on the upper end of the concrete foundation.

The shape of the tower window is polygonal, which includes a horizontally arranged cross arm, and support crank arms that are symmetrically arranged on both sides of the tower body perpendicular to the cross arm;

There are V-shaped or U-shaped loop wires vertically arranged in the upper, middle and lower layers in the tower window.

The U-shaped loop wire is composed of three insulator strings connected by wire fittings;

The V-shaped loop wire is composed of two insulator strings connected by wire fittings.

The wire fittings include a frame shaped as a regular polygon and wire clips arranged at vertices of the frame;

The wire clamp includes a cross shaft connected in sequence, an elastic column and a clamp composed of a clamp main body and a clamp cover;

The cross shaft is movably connected to the frame, and its axial center is provided with a fixed shaft fixedly connected to the main body of the clamp;

The elastic column is arranged around the cross shaft.

The insulator string includes an epoxy resin glass fiber reinforced plastic drawing rod with a silicon rubber composite material layer on the surface and an umbrella skirt-shaped insulator arranged in the axial direction of the drawing rod.

The tower window is provided with a beam arranged along the radial direction of the tower body, and the tower window is divided into an upper window and a lower window;

Both the upper window and the lower window are provided with V-shaped or U-shaped loop wires arranged in a vertical inverted triangle.

The surface of the transmission tower is coated with an anti-corrosion material, and the anti-corrosion material contains:

Al: 0.01-2.2%, Mg: 0.01-0.45%, Re: 0.06-2.0%,

Cu: 0.03-1.5%, Cr: 0.08-0.3%, Nb: 0.005-0.01%,

Ni: 0.006 to 0.01%, B: 0.002 to 0.06%, and the balance is Zn and other unavoidable impurities.

Described concrete foundation comprises the concrete pouring of the following components by mass percentage:

Cement, mineral admixture, medium sand, gravel, water, preservatives and naphthalene-based water reducer: cement, 7% to 9%; mineral admixture, 6% to 8%; medium sand, 30% to 33% ; stones, 42% to 48%; water, 7% to 8%; preservatives, 0.6% to 0.7% and naphthalene water reducer 0.1% to 0.2%.

The cap includes a bottom plate, a fixed beam and a tower foot fixture arranged sequentially on the upper end of the concrete foundation;

The bottom plate is a reinforced concrete slab;

The fixed beams are reinforced concrete slats arranged in parallel transversely along the bottom plate, and bolts connected to the bottom plate are arranged perpendicular to the axial direction;

The tower foot fixture includes a fixed column vertically fixed to the fixed beam and an anchor bolt pre-embedded in the fixed column and arranged coaxially therewith.

The transmission tower is made of Q235, Q345, Q390, Q420 or Q460 angle steel or steel pipe.

Taking a straight-line tower of a 1000kV double-circuit AC line as an example, the conventional wire arrangement type tower and the double-circuit transmission tower of this patent are respectively designed. The corridor width and demolition costs are compared under the same design conditions, as shown in Table 1. Among them, the unit demolition cost is considered at 1500 yuan/m ² , and the line length is considered at 200km.

Table 1 Corridor width and cost comparison (1000kV double circuit AC)

According to the data in Table 1, it can be seen that the line corridor width and demolition cost of the double-circuit transmission tower proposed by the present invention are significantly reduced compared with the conventional tower type, and the advantages are more prominent.

Taking the linear tower of a 500kV double-circuit AC line as an example, the conventional wire arrangement type tower and the compact tower of this patent are designed respectively. The corridor width and demolition costs are compared under the same design conditions, as shown in Table 2. Among them, the unit demolition cost is considered at 1500 yuan/ ^m2 , and the line length is considered at 150km.

Table 2 Corridor width and cost comparison (500kV double circuit AC)

According to the data in Table 2, it can be seen that the line corridor width and demolition cost of the double-circuit transmission tower proposed by the present invention are significantly reduced compared with the conventional tower type, and the advantages are more prominent.

Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

1. The double-circuit power transmission tower provided by this application has the excellent effects of small transmission corridor width, strong power transmission capacity, strong torsion resistance of the power tower, saving land resources and low production and maintenance costs.

2. The double-circuit transmission tower provided by this application adopts V-shaped circuit conductors, which has a small swing angle and has the excellent effect of small tower head width and small structural span.

3. The structure design of the double-circuit transmission tower provided by this application is reasonable, and it has good torsion resistance of the tower.

4. The surface of the transmission tower provided by this application is coated with anti-corrosion materials, which has excellent effects of preventing corrosion of the transmission tower, improving the corrosion resistance of the transmission tower, and increasing the service life of the transmission tower for at least one year.

5. The concrete provided by this application adopts a special material proportioning method, which improves the strength level of the concrete, reduces the production cost and has high anti-seepage and anti-crack effects.

6. The structural design of the platform provided by the application is reasonable, and has the excellent effects of strong stability, low production cost and simple installation.

Description of drawings

Fig. 1 is the front view of the double circuit transmission tower provided by the present invention;

Fig. 2 is the front view of the double circuit transmission tower provided by the present invention;

Fig. 3 is the front view of the double circuit transmission tower provided by the present invention;

Figure 4 is a schematic diagram of the basic structure provided by the present invention;

Fig. 5 is a front view of the wire fitting provided by the present invention;

Fig. 6 is a schematic diagram of the structure of the main body of the cable clamp provided by the present invention;

Fig. 7 is the front view of existing dry-shaped tower head;

Fig. 8 is the front view of the existing dry-shaped tower head;

Fig. 9 is the front view of existing T-shaped tower;

Among them, 1 - tower body, 2 - tower head, 3 - foundation, 4 - tower window, 5 - ground wire support, 6 - concrete foundation, 7 - cap, 8 - cross arm, 9 - supporting crank arm, 10 - Insulator string, 11—conductor fittings, 12—frame, 13—conductor clamp, 14—cross shaft, 15—elastic column, 16—clamp body, 17—bottom plate, 18—fixed beam, 19—tower foot fixture, 20—beam.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1:

As shown in Figures 1 and 2, a double-circuit power transmission tower, the power transmission tower is provided with a tower body 1 vertically arranged and a tower head 2 and a foundation 3 respectively arranged at the upper and lower ends of the tower body 1,

The tower head 2 is provided with a tower window 4, a ground wire support 5 arranged at both ends of the upper part of the tower window 4 and a loop wire arranged in the tower window 4;

As shown in FIG. 4 , the foundation 3 is provided with a concrete foundation 6 and an abutment 7 arranged on the upper end of the concrete foundation 6 .

The shape of the tower window 4 is polygonal, and it is provided with a cross arm 8 arranged horizontally, and support crank arms 9 arranged symmetrically on both sides of the tower body 1 perpendicular to the cross arm 8;

The tower window 4 is provided with V-shaped or U-shaped loop wires vertically arranged in upper, middle and lower layers.

As shown in Figure 2, the U-shaped loop wire is composed of three insulator strings 10 connected by wire fittings 11;

As shown in FIG. 1 , the V-shaped return wire is composed of two insulator strings 10 connected by wire fittings 11 .

As shown in Figure 5, the wire fitting 11 is provided with a frame 12 shaped as a regular polygon and a wire clamp 13 arranged at the apex of the frame 12;

As shown in Figure 6, the wire clamp 13 is provided with a cross shaft 14, an elastic column 15 and a clamp composed of a clamp main body 16 and a clamp gland;

The cross shaft 14 is movably connected with the frame 12, and its axial center is provided with a fixed shaft fixedly connected with the clamp main body 16;

The elastic column 15 is arranged around the cross shaft 14 .

The insulator string 10 is an epoxy resin FRP pull-out rod with a silicone rubber composite material layer on the surface and an umbrella skirt-shaped insulator arranged in the axial direction of the pull-out rod.

Both the upper window and the lower window are V-shaped or U-shaped loop wires arranged in a vertical inverted triangle. The surface of the transmission tower is coated with an anti-corrosion material, and the anti-corrosion material contains:

Al: 0.01-2.2%, Mg: 0.01-0.45%, Re: 0.06-2.0%,

Cu: 0.03-1.5%, Cr: 0.08-0.3%, Nb: 0.005-0.01%,

Ni: 0.006 to 0.01%, B: 0.002 to 0.06%, and the balance is Zn and other unavoidable impurities.

Described concrete foundation 6 comprises the concrete pouring of following components by mass percentage:

Cement, mineral admixture, medium sand, gravel, water, preservatives and naphthalene-based water reducer: cement, 7% to 9%; mineral admixture, 6% to 8%; medium sand, 30% to 33% ; stones, 42% to 48%; water, 7% to 8%; preservatives, 0.6% to 0.7% and naphthalene water reducer 0.1% to 0.2%.

As shown in Figure 4, the cap 7 is provided with a bottom plate 17, a fixed beam 18 and a tower foot fixture 20 arranged sequentially on the upper end of the concrete foundation 6;

The bottom plate 17 is a reinforced concrete slab;

The fixed beam 18 is a reinforced concrete slat arranged transversely parallel to the bottom plate 17, and bolts connected to the bottom plate 17 are arranged perpendicular to its axial direction;

The tower foot fixture 20 is provided with a fixed column vertically fixed to the fixed beam 18 and an anchor bolt pre-embedded in the fixed column and arranged coaxially therewith.

The transmission tower is made of Q235, Q345, Q390, Q420 or Q460 angle steel or steel pipe.

Example 2:

As shown in Figure 3, a double-circuit power transmission tower, the power transmission tower is provided with a tower body 1 vertically arranged and a tower head 2 and a foundation 3 respectively arranged at the upper and lower ends of the tower body 1,

The tower head 2 is provided with a tower window 4, a ground wire support 5 arranged at both ends of the upper part of the tower window 4 and a loop wire arranged in the tower window 4;

As shown in FIG. 4 , the foundation 3 is provided with a concrete foundation 6 and an abutment 7 arranged on the upper end of the concrete foundation 6 .

The shape of the tower window 4 is polygonal, and it is provided with a cross arm 8 arranged horizontally, and support crank arms 9 arranged symmetrically on both sides of the tower body 1 perpendicular to the cross arm 8;

As shown in Figure 3, the tower window 4 is provided with a beam 19 arranged along the radial direction of the tower body 1, and the tower window 4 is divided into an upper window and a lower window;

Both the upper window and the lower window are provided with V-shaped or U-shaped loop wires arranged in a vertical inverted triangle.

The U-shaped loop wire is composed of three insulator strings 10 connected by wire fittings 11;

The V-shaped return wire is composed of two insulator strings 10 connected by wire fittings 11 .

As shown in Figure 5, the wire fitting 11 is provided with a frame 12 shaped as a regular polygon and a wire clamp 13 arranged at the apex of the frame 12;

As shown in Figure 6, the wire clamp 13 is provided with a cross shaft 14, an elastic column 15 and a clamp composed of a clamp main body 16 and a clamp gland;

The cross shaft 14 is movably connected with the frame 12, and its axial center is provided with a fixed shaft fixedly connected with the clamp main body 16;

The elastic column 15 is arranged around the cross shaft 14 .

The insulator string 10 is an epoxy resin FRP pull-out rod with a silicone rubber composite material layer on the surface and an umbrella skirt-shaped insulator arranged in the axial direction of the pull-out rod.

The surface of the transmission tower is coated with an anti-corrosion material, and the anti-corrosion material contains:

Al: 0.01-2.2%, Mg: 0.01-0.45%, Re: 0.06-2.0%,

Cu: 0.03-1.5%, Cr: 0.08-0.3%, Nb: 0.005-0.01%,

Ni: 0.006 to 0.01%, B: 0.002 to 0.06%, and the balance is Zn and other unavoidable impurities.

Described concrete foundation 6 comprises the concrete pouring of following components by mass percentage:

Cement, mineral admixture, medium sand, gravel, water, preservatives and naphthalene-based water reducer: cement, 7% to 9%; mineral admixture, 6% to 8%; medium sand, 30% to 33% ; stones, 42% to 48%; water, 7% to 8%; preservatives, 0.6% to 0.7% and naphthalene water reducer 0.1% to 0.2%.

As shown in Figure 4, the cap 7 is provided with a bottom plate 17, a fixed beam 18 and a tower foot fixture 20 arranged sequentially on the upper end of the concrete foundation 6;

The bottom plate 17 is a reinforced concrete slab;

The fixed beam 18 is a reinforced concrete slat arranged transversely parallel to the bottom plate 17, and bolts connected to the bottom plate 17 are arranged perpendicular to its axial direction;

The tower foot fixture 20 is provided with a fixed column vertically fixed to the fixed beam 18 and an anchor bolt pre-embedded in the fixed column and arranged coaxially therewith.

The transmission tower is made of Q235, Q345, Q390, Q420 or Q460 angle steel or steel pipe.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still modify or equivalently replace the specific embodiments of the present invention. , and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the pending application of the present invention.

Claims (10)

1. A double-circuit power transmission tower, the power transmission tower includes a tower body (1) vertically arranged and a tower head (2) and a foundation (3) that are respectively arranged at the upper and lower ends of the tower body (1), its characteristics in: The tower head (2) includes a tower window (4), a ground wire support (5) arranged at both ends of the upper part of the tower window (4) and a loop conductor arranged in the tower window (4); The foundation (3) includes a concrete foundation (6) and a cap (7) arranged on the upper end of the concrete foundation (6). 2. The power transmission tower according to claim 1, characterized in that, the tower window (4) is polygonal in shape, which includes horizontally arranged cross arms (8), symmetrically arranged vertically to the cross arms (8). Support crank arms (9) on both sides of the tower body (1); The tower window (4) is provided with V-shaped or U-shaped loop wires vertically arranged in upper, middle and lower layers. 3. The transmission tower of claim 2, wherein: The U-shaped loop wire is composed of three insulator strings (10) connected by wire fittings (11); The V-shaped return wire is composed of two insulator strings (10) connected by wire fittings (11). 4. The transmission tower as claimed in claim 3, characterized in that, said wire fittings (11) comprise a frame (12) shaped as a regular polygon and a wire clamp (13) arranged at the apex of said frame (12) ; The wire clamp (13) includes a cross shaft (14), an elastic column (15) connected in sequence, and a clamp composed of a clamp main body (16) and a clamp gland; The cross shaft (14) is movably connected with the frame (12), and its axial center is provided with a fixed shaft fixedly connected with the clamp main body (16); The elastic column (15) is arranged around the cross shaft (14). 5. The power transmission tower as claimed in claim 3, characterized in that, the insulator string (10) comprises an epoxy resin glass fiber reinforced plastic drawing rod provided with a silicone rubber composite material layer on the surface and is arranged on the axial direction of the drawing rod. Directional shed insulators. 6. The power transmission tower as claimed in claim 1, characterized in that, the tower window (4) is provided with a crossbeam (19) arranged along the radial direction of the tower body (1), and the tower window ( 4) Divided into upper window and lower window; Both the upper window and the lower window are provided with V-shaped or U-shaped loop wires arranged in a vertical inverted triangle. 7. The power transmission tower according to claim 1, wherein the surface of the power transmission tower is coated with an anti-corrosion material, and in terms of mass percentage, the anti-corrosion material contains: Al: 0.01-2.2%, Mg: 0.01-0.45%, Re: 0.06-2.0%, Cu: 0.03-1.5%, Cr: 0.08-0.3%, Nb: 0.005-0.01%, Ni: 0.006 to 0.01%, B: 0.002 to 0.06%, and the balance is Zn and other unavoidable impurities. 8. transmission tower as claimed in claim 1 is characterized in that, described concrete foundation (6) comprises the concrete pouring that the following components by mass percentage constitute: Cement, mineral admixtures, medium sand, gravel, water, preservatives and naphthalene-based water reducers: cement, 7% to 9%; mineral admixtures, 6% to 8%; medium sand, 30% to 33% ; stones, 42% to 48%; water, 7% to 8%; preservatives, 0.6% to 0.7% and naphthalene water reducer 0.1% to 0.2%. 9. The power transmission tower according to claim 8, characterized in that, the cap (7) comprises a bottom plate (17), a fixed beam (18) and a fixed tower foot that are sequentially arranged on the upper end of the concrete foundation (6). pieces (20); The bottom plate (17) is a reinforced concrete slab; The fixed beam (18) is a reinforced concrete slat arranged transversely parallel to the bottom plate (17), and bolts connected to the bottom plate (17) are arranged perpendicular to its axial direction; The tower foot fixing part (20) includes a fixed column vertically fixed to the fixed beam (18) and an anchor bolt pre-embedded in the fixed column and arranged coaxially therewith. 10. The transmission tower according to claim 1, characterized in that, the transmission tower is made of angle steel or steel pipe of model Q235, Q345, Q390, Q420 or Q460.