Device for changing single hanging point to double hanging points of tangent tower of power transmission line

Abstract

The utility model discloses a power transmission line tangent tower single-hanging-point-to-double-hanging-point device, which relates to the technical field of power equipment and comprises short angle steel, long angle steel and a connecting plate. Two limbs of the short angle steel cling to the inner surface of the angle steel on one side of the original single hanging point of the iron tower cross arm, one limb of the long angle steel clings to the outer surface of one limb of the angle steel on one side of the original single hanging point of the iron tower cross arm, and the connecting plate clings to the outer surface of the other limb of the angle steel on one side of the original single hanging point of the iron tower cross arm and the outer surface of the other limb of the long angle steel. The clamping distance of the double-hanging-point first fitting is consistent with the clamping distance of the original single-hanging-point first fitting, the standard fitting of the same type of the original line is adopted, the purchase cost is low, the construction process is simple and convenient, and the difficulty and the cost of operation, maintenance and replacement can be effectively reduced. All the components are connected through bolts, needed equipment and tools are few, the construction difficulty is effectively lowered, and the construction operation efficiency is improved. All components are convenient to machine and manufacture, the overall structure is simple, cost is low, and production quality is easy to control.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to a device for converting a single hanging point into a double hanging point for a straight tower of a power transmission line. Background Art

[0002] With the continuous improvement and strengthening of my country's transportation network and electric energy transmission network, the crossing (i.e., important crossing) of existing overhead transmission lines with newly built railways (including high-speed railways), expressways, first-class highways and newly built 110kV and above transmission lines is becoming more and more frequent. According to relevant requirements, the suspension insulator strings of the linear towers in the important crossing spans should adopt independent double strings (i.e., double-hanging-point double-connected insulator strings). For the newly added important crossings of existing overhead transmission lines, in order to meet the requirements of hanging independent double strings, the single hanging points on the linear towers of the existing lines need to be transformed into double hanging points. The method usually adopted in engineering practice is to remove the single hanging point angle steel of the cross arm of the existing tower and reinstall the angle steel with double hanging points. This method has problems such as high construction difficulty, cumbersome procedures, and long power outage time. At the same time, the connection between the new and old angle steels also brings certain interference to the structural stability of the existing linear towers, and there are certain safety risks.

[0003] Defects and shortcomings of the existing technology:

[0004] Therefore, people have made corresponding treatment measures for the above problems. Chinese patent document CN 103089056A provides "Installation hardware and use method of changing single hanging point of straight iron tower to double hanging point". This invention patent includes a hanging plate, an upper clamping plate, and a lower clamping plate. The upper and lower clamping plates are connected by fastener 1, the upper clamping plate is connected to the upper part of the hanging plate by fastener 2, and the lower clamping plate is connected to the middle part of the hanging plate by fastener 3. The hanging plate, the upper clamping plate, and the lower clamping plate clamp the original iron tower hanging angle steel between them, and the lower part of the hanging plate is provided with two hanging holes. The hardware is suitable for ZM type and GUZ type straight iron tower hanging points, suitable for angle steels of ∠90 and below, and can be used for hanging angle steels of different thicknesses. It has strong versatility, simple structure, and is easy to install. It does not change the iron tower pole structure and does not dismantle the pole tower components. The installation hardware uses a steel plate fixed on the outer surface of the existing iron tower hanging point angle steel to achieve double fixed hanging points, meeting relevant regulations and document requirements. Chinese patent document CN 212304678 U provides a "750kV iron tower single hanging point to double hanging point structure", the utility model patent includes a first L-shaped steel plate, a second L-shaped steel plate, a first steel plate and a second steel plate, the second steel plate is clamped and fixed on the angle steel in the 750kV iron tower by the first steel plate, the first L-shaped steel plate and the second L-shaped steel plate, the second steel plate is opened with a hanging hole and fixed to the bottom of the first steel plate by bottom welding and welding stiffening ribs. The device is fixed by opening holes in the original iron tower angle steel and welding multiple times, has good strength, and can achieve the purpose of changing the single hanging point of the 750kV iron tower to double hanging points.

[0005] However, since the hanging point of the hardware installation in CN 103089056A is set on the steel plate fixed on the outer surface of the tower angle steel, the thickness of the steel plate intrudes into the clamping spacing of the angle steel hanging holes on both sides of the insulator string head hardware. In engineering practice, the insulator string head hardware needs to be adjusted in size compared with the standard hardware or special hardware can be selected for installation, and the construction and operation maintenance and replacement costs are high. The device in CN212304678 U needs to make holes in the original angle steel of the tower to achieve the purpose of clamping the first L-shaped steel plate and the second L-shaped steel plate on the 750kV tower angle steel, and the high-altitude hole-making operation process in the narrow space on the tower is relatively complicated; at the same time, the device needs to fix the second steel plate and the first steel plate by multiple welding. The high-altitude welding operation requires more equipment to be carried, the weld anti-corrosion process requirements are high, and the overall device construction is difficult.

[0006] Therefore, there is an urgent need for a device for converting a single hanging point into a double hanging point for a straight tower of a power transmission line. Summary of the invention

[0007] In order to solve the above technical problems, the utility model provides a device for converting a single hanging point to a double hanging point of a straight tower of a power transmission line, which has the characteristics of comprehensive single hanging point to double hanging point conversion functions, low safety risks, strong practicality and convenient installation. The device can fully realize the function of converting a single hanging point to a double hanging point of a straight tower of an important cross-span section without modifying the tower components, avoiding the construction work of opening holes on the tower, and the installation method is simple, which effectively reduces the equipment and tools that the workers on the tower need to carry, and improves work efficiency; at the same time, the clamping spacing of the hanging point on the straight tower after the modification is consistent with that before the modification, and the selection of the insulator string head hardware is more convenient, which reduces the operation and maintenance costs.

[0008] To achieve the above purpose, the utility model provides the following solutions:

[0009] The utility model provides a device for changing a single hanging point of a straight tower of a power transmission line into a double hanging point, comprising a short angle steel, a long angle steel and a connecting plate; two limbs of the short angle steel are closely attached to the inner surface of an angle steel on one side of an original single hanging point of a cross arm of the iron tower, one limb of the long angle steel is closely attached to the outer surface of one limb of an angle steel on one side of an original single hanging point of the cross arm of the iron tower, and the connecting plate is closely attached to the outer surface of the other limb of the angle steel on one side of the original single hanging point of the cross arm of the iron tower and the outer surface of the other limb of the long angle steel; the short angle steel is connected to the long angle steel and the connecting plate respectively by a first fastener, and the long angle steel and the connecting plate are connected by a second fastener.

[0010] Optionally, a first connection portion is provided at one end of the connecting plate, and a second connection portion is provided at the other end of the connecting plate; the first connection is used to connect with the short angle steel; and the second connection is used to connect with the long angle steel.

[0011] Optionally, the first connecting portion includes two first through holes, and two second through holes are respectively provided on the two limbs of the short angle steel, and the positions of the two first through holes correspond to the positions of the two second through holes; the first through hole and the second through hole are connected by the first fastener.

[0012] Optionally, the second connecting portion includes four third through holes, and four fourth through holes are respectively arranged on the two limbs of the short angle steel, and the positions of the four third through holes correspond to the positions of the four fourth through holes; the third through holes and the fourth through holes are connected by the second fastener.

[0013] Optionally, two fifth through holes are provided at both ends of the long angle steel, and the two fifth through holes are used for connecting the first fittings of the double-hanging-point double-insulator fitting string, thereby realizing the function of changing a single hanging point to a double hanging point.

[0014] Optionally, the first fastener and the second fastener both include a bolt and a nut, and the length of the bolt in the first fastener is greater than the length of the bolt in the second fastener.

[0015] Optionally, the connecting plate is a steel plate.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] (1) The utility model device realizes the function of changing the single hanging point of the linear tower in the important crossing span of the existing transmission line to a double hanging point. The clamping distance of the first hardware of the double hanging point is consistent with the clamping distance of the first hardware of the original single hanging point. The same type of standard hardware of the original line is used, the procurement cost is low, the construction process is simple, and the difficulty and cost of operation, maintenance and replacement can be effectively reduced.

[0018] (2) The device of the utility model realizes the function of changing a single hanging point to a double hanging point. The fixing method of each component of the device to the iron tower is fastener bolt connection. The equipment and tools required for construction work on the tower are relatively small, which effectively reduces the difficulty of construction and improves the efficiency of construction work.

[0019] (3) The device of the utility model is composed of four parts: short angle steel, steel plate, long angle steel and fasteners. The materials used are all conventional angle steel, steel plate and bolts. The short angle steel, steel plate, long angle steel and the original tower angle steel are fixed by bolt connection. The components of the device are easy to process and manufacture, the overall structure is simple, the cost is low, and the production quality is easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The utility model is a schematic diagram of the overall structure of a transmission line straight tower single hanging point to double hanging point device installed on the tower cross arm in an example of the top view.

[0022] Figure 2 The utility model is a schematic diagram of the overall structure of a transmission line straight tower single hanging point to double hanging point device installed on the tower cross arm in an example.

[0023] Figure 3 The utility model is a schematic diagram of the overall structure of a side view in an example of a device for converting a single hanging point into a double hanging point of a straight tower of a power transmission line.

[0024] Figure 4 The utility model is a schematic diagram of the lateral structure of short angle steel in an example of a device for converting a single hanging point into a double hanging point of a straight tower of a power transmission line.

[0025] Figure 5 The utility model is a schematic diagram of a short angle steel structure in an example of a device for converting a single hanging point into a double hanging point of a straight tower of a power transmission line.

[0026] Figure 6 The utility model is a schematic diagram of the lateral structure of a steel plate in an example of a device for converting a single hanging point into a double hanging point for a straight tower of a power transmission line.

[0027] Figure 7 The utility model is a schematic diagram of a steel plate structure in an example of a device for converting a single hanging point into a double hanging point for a straight tower of a power transmission line.

[0028] Figure 8 The utility model is a schematic diagram of the lateral structure of a long angle steel in an example of a device for converting a single hanging point into a double hanging point of a straight tower of a power transmission line.

[0029] Fig. 9 The utility model is a schematic diagram of a long angle steel structure in an example of a device for converting a single hanging point into a double hanging point of a straight tower of a power transmission line.

[0030] Fig.10 The utility model is a schematic diagram of the structure of the first fastener in an example of a device for converting a single hanging point into a double hanging point for a straight tower of a power transmission line.

[0031] Fig.11The utility model is a schematic diagram of the second fastener structure in an example of a device for converting a single hanging point into a double hanging point for a straight tower of a power transmission line.

[0032] Description of reference numerals:

[0033] 1. Short angle steel; 2. Long angle steel; 3. Steel plate; 4. First fastener; 5. Second fastener. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] like Figures 1 to 11 As shown, this embodiment provides a device for changing a single hanging point of a straight tower of a power transmission line to a double hanging point, comprising two symmetrically arranged short angle steels 1, steel plates 3, long angle steels 2 and fasteners. The short angle steels 1, steel plates 3 and long angle steels 2 are connected by fasteners, and are respectively clamped up and down on one side of the angle steel of the original single hanging point of the cross arm of the iron tower, and a hole is opened at appropriate positions at both ends of the long angle steel 2 to form a double hanging point.

[0036] Two through holes are respectively opened on the two limbs of the short angle steel 1. One limb of the short angle steel 1 is closely attached to the inner surface of the original iron tower angle steel and is connected and fixed to the steel plate 3 through the first fastener 4. The other limb of the short angle steel 1 is closely attached to the other inner surface of the original iron tower angle steel and is connected and fixed to the long angle steel 2 through the first fastener 4.

[0037] Two through holes are opened at one end of the steel plate 3 and four through holes are opened at the other end. One end of the steel plate 3 is closely attached to the outer surface of the original iron tower angle steel and is connected and fixed to the short angle steel 1 through the first fastener 4, and the other end of the steel plate 3 is closely attached to the outer surface of the original iron tower angle steel and is connected and fixed to the long angle steel 2 through the second fastener 5.

[0038] Four through holes are opened in the middle section of one limb of the long angle steel 2, and two through holes are opened in the middle section of the other limb. One limb of the long angle steel 2 is tightly against the steel plate 3 and is connected and fixed by the second fastener 5, and the other limb is tightly against the outer surface of the original tower angle steel and is connected and fixed to the short angle steel 1 by the first fastener 4.

[0039] The two ends of one limb of the long angle steel 2 are cut to avoid conflict with the auxiliary materials of the tower cross arm.

[0040] A through hole is respectively opened at both ends of the other limb of the long angle steel 2, and the size of the opening matches the first hardware of the insulator string, and the independent hanging point double insulator string is installed.

[0041] When installing the utility model, short angle steel 1-steel plate 3-first fastener 4-long angle steel 2-first fastener 4-second fastener 5 are installed in sequence. After the two symmetrical short angle steels 1, steel plate 3, long angle steel 2 and fasteners of the device are installed respectively, the spacing of the hardware hanging holes composed of the two long angle steels 2 is consistent with the spacing of the hardware hanging holes of the original single hanging point of the iron tower, and the first hardware connecting the insulator string and the iron tower is installed respectively, realizing the function of changing the single hanging point to the double hanging point.

[0042] The device for converting a single hanging point to a double hanging point of a transmission line straight tower in the utility model focuses on reducing the difficulty of installation work on the device tower and the cost of operation, maintenance and replacement as much as possible on the basis of meeting the demand for converting a single hanging point to a double hanging point of a transmission line straight tower. The clamping spacing of the first hardware of the hanging point is not changed, and the first hardware of the insulator string can be selected according to the standard hardware; no holes are opened on the iron tower components, and the bolt connection of angle steel and steel plate is used to ensure the fixation of the device and the cross arm of the straight tower.

[0043] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0044] This specification uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A device for converting a single hanging point to a double hanging point on a straight tower of a power transmission line, characterized in that: It includes a short angle steel, a long angle steel and a connecting plate; two limbs of the short angle steel are closely attached to the inner surface of the angle steel on one side of the original hanging point of the cross arm of the iron tower, one limb of the long angle steel is closely attached to the outer surface of one limb of the angle steel on one side of the original hanging point of the cross arm of the iron tower, and the connecting plate is closely attached to the outer surface of the other limb of the angle steel on one side of the original hanging point of the cross arm of the iron tower and the outer surface of the other limb of the long angle steel; the short angle steel is connected to the long angle steel and the connecting plate respectively by a first fastener, and the long angle steel and the connecting plate are connected by a second fastener.

2. The device for converting a single hanging point to a double hanging point for a straight tower of a power transmission line according to claim 1, characterized in that: A first connection portion is provided at one end of the connection plate, and a second connection portion is provided at the other end of the connection plate; the first connection is used to connect with the short angle steel; and the second connection is used to connect with the long angle steel.

3. The device for converting a single hanging point to a double hanging point of a transmission line straight tower according to claim 2, characterized in that: The first connecting portion includes two first through holes, and two second through holes are respectively arranged on the two limbs of the short angle steel, and the positions of the two first through holes correspond to the positions of the two second through holes; the first through hole and the second through hole are connected by the first fastener.

4. The device for converting a single hanging point to a double hanging point for a straight tower of a power transmission line according to claim 2, characterized in that: The second connecting portion includes four third through holes, and four fourth through holes are respectively arranged on the two limbs of the short angle steel, and the positions of the four third through holes correspond to the positions of the four fourth through holes; the third through holes and the fourth through holes are connected by the second fastener.

5. The device for converting a single hanging point to a double hanging point for a transmission line straight tower according to claim 1, characterized in that: Two fifth through holes are arranged at both ends of the long angle steel, and the two fifth through holes are used for connecting the first hardware of the double-hanging-point double-insulator hardware string, so as to realize the function of changing a single hanging point to a double hanging point.

6. The device for converting a single hanging point to a double hanging point for a transmission line straight tower according to claim 1, characterized in that: The first fastener and the second fastener both include a bolt and a nut, and a length of the bolt in the first fastener is greater than a length of the bolt in the second fastener.

7. The device for converting a single hanging point to a double hanging point for a straight tower of a power transmission line according to claim 1, characterized in that: The connecting plate is a steel plate.

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