Insulator string hanger for door-type frame and installation method thereof

Abstract

The present invention provides an insulator string hanger for a gate-type frame and an installation method thereof. A triangular clamp-type hanger device is adopted, which is fixed on the gate-type frame to add a new hanging point for a newly added insulator string, thereby eliminating the step of cutting hanging holes on the old gate-type frame. On the basis of avoiding affecting the bearing capacity of the old gate-type frame, the steps of setting the hanging holes of the insulator strings are further simplified, and the overall construction efficiency is improved, which is of great significance in the reconstruction construction of the old gate-type frame.

Description

Technical Field

[0001] The invention relates to the field of technical transformation of overhead power transmission lines in power transmission and transformation projects of electric power systems, and in particular to an insulator string hanger for a gate-type frame. Background Art

[0002] The portal frame is widely used in power plants and substations in the power system. Together with the overhead line tower, it constitutes the fixed support system of the ultra-high voltage overhead transmission line. With the comprehensive development of society, the transmission capacity of power grid lines is increasing, and the optimization and adjustment of line path layout is also increasing. In recent years, large-scale line transformation of power plant switch stations and power grid substations has been gradually implemented to increase the transmission capacity of lines and adjust the line layout.

[0003] Large portal frames on EHV and UHV overhead transmission lines are generally characterized by high height, large span, and heavy load. In view of the above characteristics, large portal frames generally adopt the structural design of herringbone steel pipe pillars and triangular structural steel trusses. For the reconstruction of overhead lines in switch stations and old substations with a long operating time, it is generally necessary to adjust the position of the insulator string hanging points of the overhead lines on the inlet and outlet sides of the portal frame in the station. For old portal frames that have been built and used for a long time, the structural parts have different degrees of rust and aging, the overall bearing capacity of the portal frame is reduced, and the actual allowable load limit cannot be measured. In addition to the reserved openings at the hanging point hardware of the insulator string of the original line, there are no hanging point openings on the old portal frame trusses. In order to meet the requirements of line reconstruction, it is necessary to add new hanging points for insulator strings on the truss. The conventional construction method is to use hot gas cutting to open holes on the angle steel of the portal frame truss as hanging points. However, this will lead to a reduction in the cross-sectional area of ​​the truss angle steel, and the thermal deformation caused by gas cutting will further reduce the bearing capacity of the portal frame. In addition, the portal truss is generally tens of meters above the ground. The operators have to operate and use heavy gas cutting equipment at high altitudes. After the holes are opened by gas cutting, they have to be manually polished and cleaned. The use of conventional construction methods has high safety risks for both the portal frame and the operators, and the project volume is large, quality control is difficult, the construction period is long, and the construction operation is difficult. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an insulator string hanger for a portal frame and an installation method thereof, which has a simple structure and is easy to install and adjust, and can achieve the purpose of fixing the insulator string without drilling holes on the portal frame truss to add insulator string hanging points, reduce the safety risks of adding insulator string hanging points on the truss to the portal frame and operators, improve the operation efficiency, operation quality and safety factor of the device, can reduce the amount of engineering and the difficulty of construction operations, shorten the power outage time and construction period of overhead line reconstruction and reduce the labor intensity of operators.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an insulator string hanger for a gate-type frame, including an upper connecting plate, the upper connecting plate adopts an inverted "V"-shaped plate, a group of bevel steels are provided on both sides of the upper connecting plate, a first connecting bolt is passed between the upper end of the bevel steel and the upper connecting plate, the lower end of the bevel steel is connected to the lower connecting plate through the first connecting bolt, the lower connecting plate adopts a folding plate, a first horizontal angle steel is provided on the lower connecting plate, and a first hanging hole is provided on the first horizontal angle steel.

[0006] In a preferred solution, a second horizontal angle steel is provided between the two first horizontal angle steels located on both sides of the upper connecting plate, and both ends of the second horizontal angle steel are respectively connected to the two first horizontal angle steels by second connecting bolts.

[0007] In a preferred solution, the inclination angles on both sides of the upper connecting plate, the inclination angle of the angled steel and the inclination angle of the upper half of the lower connecting plate are all the same as the inclination angle of the truss side of the portal frame.

[0008] In a preferred solution, the lower half of the lower connecting plate is vertical, and the first horizontal angle steel is welded to the lower half of the lower connecting plate.

[0009] A method for installing the above-mentioned insulator string hanger comprises the following steps:

[0010] 1) According to the layout diagram of insulator strings on the portal frame for technical transformation of overhead transmission lines, select the exact location of the insulator string hanging points to be added on the truss of the portal frame and mark them;

[0011] 2) Measure and verify that the electrical safety distance between the newly added hanging point on the portal frame truss and the adjacent lines and structural members meets the requirements;

[0012] 3) Install the pre-installed upper connecting plate and angled steel above the truss at the newly added hanging point of the tension insulator string;

[0013] 4) Install the pre-welded lower connecting plate and the first horizontal angle steel on the lower sections of the angled steel on both sides of the upper connecting plate, and tighten the first connecting bolts;

[0014] 5) Install the second horizontal angle steel across the truss below, and fix the two ends of the second horizontal angle steel to the first horizontal angle steel by tightening the second connecting bolts;

[0015] 7) Remove the old overhead line conductors and their insulator strings on both sides of the portal frame truss, and install the tension insulator strings in the first hanging hole of the hanger.

[0016] An insulator string hanger for a door-type frame comprises two vertical plates, wherein the upper and lower sections of the two vertical plates are vertical sections, the middle section is a folded plate section, the cross section of the folded plate section is a right triangle, bolt holes are arranged between the upper and lower sections of the two vertical plates, and the two vertical plates are connected by bolts to form a whole.

[0017] In a preferred solution, a second hanging hole is reserved on the lower sections of the two vertical boards.

[0018] A method for installing the above-mentioned insulator string hanger comprises the following steps:

[0019] 1) According to the layout diagram of insulator strings on the portal frame for technical transformation of overhead transmission lines, select the exact location of the insulator string hanging points to be added on the truss of the portal frame and mark them;

[0020] 2) Measure and verify that the electrical safety distance between the newly added hanging point on the portal frame truss and the adjacent lines and structural members meets the requirements;

[0021] 3) Install two vertical plates symmetrically on both sides of the newly added hanging point of the suspension insulator string;

[0022] 4) Keep the horizontal part of the folded plate section of the vertical plate close to the top surface of the horizontal angle steel of the portal frame;

[0023] 5) Install bolts in the bolt holes;

[0024] 6) Remove the old overhead line conductors and their insulator strings on both sides of the portal frame truss, and install the suspension insulator strings in the second hanging hole of the bracket.

[0025] The insulator string hanger for the gate-type frame and the installation method thereof provided by the present invention have the following beneficial effects by adopting the above structure:

[0026] (1) The use of this device and installation method does not require the use of fire or gas cutting on the truss steel structure, will not reduce the cross-sectional area of ​​the steel structure, will not cause thermal deformation to the truss steel structure, and will not have any effect on the original structural strength of the truss steel structure. In addition, the hoop-type device has a simple and light structure, and the components are fixed with bolts, so the installation steps are simple and labor-saving;

[0027] (2) This device and construction method greatly reduce the safety risks to the portal frame and operators, and facilitate the standardization of operation procedures and the improvement of operation quality and efficiency;

[0028] (3) In actual installation, taking a line with three suspension insulator string hanging points on the portal frame and three tension insulator string hanging points on both sides, a total of nine hanging points need to be added as an example, it takes 8 hours to open and clean the holes using conventional construction methods, while it only takes 3 hours using this device and construction method. For the reconstruction of multiple lines, the construction period can be shortened by about 60%, which also shortens the power outage time and reduces the power outage losses, and also reduces the difficulty of construction operations and project investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0030] Figure 1 The figure is a schematic diagram of the overall structure of the hanger for the tension insulator string in the present invention.

[0031] Figure 2 It is a schematic diagram of the overall structure of the hanger used for suspending an insulator string in the present invention.

[0032] In the figure: upper connecting plate 1, first connecting bolt 2, angle steel 3, lower connecting plate 4, second connecting bolt 5, first horizontal angle steel 6, second horizontal angle steel 7, first hanging hole 8, vertical plate 9, bolt hole 901, second hanging hole 902, folding plate section 10. DETAILED DESCRIPTION

[0033] Embodiment 1:

[0034] like Figure 1 In the invention, an insulator string hanger for a door-type frame includes an upper connecting plate 1, wherein the upper connecting plate 1 is an inverted "V"-shaped plate, a group of bevel steels 3 are provided on both sides of the upper connecting plate 1, a first connecting bolt 2 is passed between the upper end of the bevel steel 3 and the upper connecting plate 1, and the lower end of the bevel steel 3 is connected to a lower connecting plate 4 through the first connecting bolt 2, the lower connecting plate 4 is a folded plate, a first horizontal angle steel 6 is provided on the lower connecting plate 4, and a first hanging hole 8 is provided on the first horizontal angle steel 6.

[0035] In a preferred solution, a second horizontal angle steel 7 is provided between the two first horizontal angle steels 6 located on both sides of the upper connecting plate 1 , and both ends of the second horizontal angle steel 7 are respectively connected to the two first horizontal angle steels 6 by second connecting bolts 5 .

[0036] In a preferred solution, the inclination angles on both sides of the upper connecting plate 1, the inclination angle of the angled steel 3 and the inclination angle of the upper half of the lower connecting plate 4 are all the same as the inclination angle of the truss side of the portal frame.

[0037] In a preferred solution, the lower half of the lower connecting plate 4 is vertical, and the first horizontal angle steel 6 is welded to the lower half of the lower connecting plate 4 .

[0038] Embodiment 2:

[0039] Based on Example 1, the following steps are used to install the insulator string hanger:

[0040] 1) According to the layout diagram of insulator strings on the portal frame for technical transformation of overhead transmission lines, select the exact location of the insulator string hanging points to be added on the truss of the portal frame and mark them;

[0041] 2) Measure and verify that the electrical safety distance between the newly added hanging point on the portal frame truss and the adjacent lines and structural members meets the requirements;

[0042] 3) Install the pre-installed upper connecting plate 1 and angled steel 3 above the truss at the newly added hanging point of the tension insulator string;

[0043] 4) Install the pre-welded lower connecting plate 4 and the first horizontal angle steel 6 on the lower sections of the angled steel 3 on both sides of the upper connecting plate 1, and tighten the first connecting bolts 2;

[0044] 5) Install the second horizontal angle steel 7 across the bottom of the truss, and fix the two ends of the second horizontal angle steel 7 to the first horizontal angle steel 6 by tightening the second connecting bolts 5;

[0045] 7) Remove the old overhead line conductors and their insulator strings on both sides of the portal frame truss, and install the tension insulator strings in the first hanging hole 8 of the hanging bracket.

[0046] Embodiment 3:

[0047] like Figure 2 In the invention, an insulator string hanger for a door-type frame includes two vertical plates 9, wherein the upper and lower sections of the two vertical plates 9 are vertical sections, and the middle section is a folded plate section 10, and the cross-section of the folded plate section 10 is a right-angled triangle. Bolt holes 901 are provided between the upper and lower sections of the two vertical plates 9, and the two vertical plates 9 are connected by bolts to form a whole.

[0048] In a preferred solution, second hanging holes 902 are reserved on the lower sections of the two vertical plates 9 .

[0049] Embodiment 4:

[0050] Based on Example 3, the following steps are used to install the insulator string hanger:

[0051] 1) According to the layout diagram of insulator strings on the portal frame for technical transformation of overhead transmission lines, select the exact location of the insulator string hanging points to be added on the truss of the portal frame and mark them;

[0052] 2) Measure and verify that the electrical safety distance between the newly added hanging point on the portal frame truss and the adjacent lines and structural members meets the requirements;

[0053] 3) Two vertical plates 9 are symmetrically installed on both sides of the newly added hanging point of the suspension insulator string;

[0054] 4) Keep the horizontal part of the folded plate section 10 of the vertical plate 9 close to the top surface of the horizontal angle steel of the portal frame;

[0055] 5) Install the bolt in bolt hole 901;

[0056] 6) Remove the old overhead line conductors and their insulator strings on both sides of the portal frame truss, and install the suspension insulator strings in the second hanging holes 902 of the hanging bracket.

[0057] The insulator string hanger and the method for installing the hanger proposed in the present application provide a new method for installing the insulator string on the door frame, which does not require cutting new hanging holes on the door frame, can avoid affecting the bearing capacity of the door frame, and is more suitable for the transformation of old door-type frames. In addition, since the hanging hole cutting step is omitted, the staff does not need to carry heavy gas cutting equipment to work at high altitudes, which ensures the safety of the staff.

Claims

1. An insulator string hanger for a door-type frame, characterized by: The upper connecting plate (1) is an inverted "V"-shaped plate, a group of angled steels (3) are provided on both sides of the upper connecting plate (1), the upper end of the angled steel (3) is connected to the upper connecting plate (1) via a group of first connecting bolts (2), the lower end of the angled steel (3) is connected to the lower connecting plate (4) via another group of first connecting bolts (2), the lower connecting plate (4) is a folded plate, a first horizontal angle steel (6) is provided on the lower connecting plate (4), and a first hanging hole (8) is provided on the first horizontal angle steel (6); A second horizontal angle steel (7) is provided between the two first horizontal angle steels (6) respectively connected to the two lower connecting plates (4), and two ends of the second horizontal angle steel (7) are respectively connected to the two first horizontal angle steels (6) via second connecting bolts (5); The installation method of the insulator string hanger for the gate-type frame comprises the following steps: 1) According to the layout diagram of insulator strings on the portal frame for technical transformation of overhead transmission lines, select the exact location of the insulator string hanging points to be added on the truss of the portal frame and mark them; 2) Measure and verify that the electrical safety distance between the newly added hanging point on the portal frame truss and the adjacent lines and structural members meets the requirements; 3) Install the pre-installed upper connecting plate (1) and the angled steel (3) above the truss at the newly added hanging point of the tension insulator string; 4) Install the pre-welded lower connecting plate (4) and the first horizontal angle steel (6) on the lower sections of the angled steel (3) on both sides of the upper connecting plate (1), and tighten the first connecting bolts (2); 5) Install a second horizontal angle steel (7) across the bottom of the truss, and fix the two ends of the second horizontal angle steel (7) to the first horizontal angle steel (6) by tightening the second connecting bolts (5); 6) Remove the old overhead line conductors and their insulator strings on both sides of the portal frame truss, and install the tension insulator strings in the first hanging holes (8) of the hanging bracket.

2. The insulator string hanger for a door-type frame according to claim 1, characterized in that: The inclination angles of both sides of the upper connecting plate (1), the inclination angle of the angled steel (3) and the inclination angle of the upper half of the lower connecting plate (4) are all the same as the inclination angle of the truss side of the portal frame.

3. The insulator string hanger for a door-type frame according to claim 1, characterized in that: The lower half of the lower connecting plate (4) is vertical, and the first horizontal angle steel (6) is welded to the lower half of the lower connecting plate (4).

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