Wire hanging method for top steel structure of transformer substation building

Abstract

The invention belongs to the technical field of electric power engineering construction, and particularly relates to a transformer substation building top steel structure wire hanging method which comprises the steps that a wire hanging structure is designed, and the section size of the wire hanging structure is calculated; purchasing a hanging line structure; mounting a wire hanging structure, namely connecting the steel wire hanging columns with building structural columns, arranging steel wire hanging beams among the steel wire hanging columns, and finally welding wire hanging plates on the steel wire hanging beams; according to the method, the plasticity is high, that is, the wire hanging plate can be welded to the needed position according to needs, the wire hanging method is more beneficial to design construction and convenient for technical renovation and overhaul, and the method fundamentally avoids the problems that in a conventional method, when design construction of a wire hanging ring has errors, the wire is difficult to install and rectify and reform.

Description

Technical Field

[0001] This application belongs to the technical field of electric power engineering construction, and specifically relates to a method for hanging wires on the steel structure at the top of a substation building. Background Art

[0002] In substation engineering, situations where conductors cross buildings often occur. In order to reduce the span of the conductors and ensure that the live distance between the conductors and the top of the building meets the specification requirements, a wire hanging structure needs to be set on the roof. Compared with the method of setting up frames separately within the station, this method of combining the wire hanging structure with the building structure can save land and is beneficial to the control of the land use index of the substation.

[0003] Usually, the method of embedding wire hanging rings in concrete beams is adopted to solve the above-mentioned wire hanging problem. However, this wire hanging method has a low error tolerance rate. If position deviations occur during the design or construction process, it will cause the conductors to be unable to be installed, and it is difficult to rectify, which is also not conducive to technical transformation and overhaul. Therefore, there is an urgent need for a wire hanging method with a high error tolerance rate and strong plasticity to better meet the construction needs of substations. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the purpose of this application is to provide a method for hanging wires on the steel structure at the top of a substation building.

[0005] To achieve the above purpose, this application adopts the following technical solutions:

[0006] A method for hanging wires on the top structure of a substation building includes the following steps:

[0007] S1: Design of the wire hanging structure, calculate the cross-sectional dimensions of the wire hanging structure, and determine the quantity of steel wire hanging columns and steel wire hanging beams;

[0008] S2: Purchase steel wire hanging columns and steel wire hanging beams according to the quantity determined in step S1, and process wire hanging plates. The steel wire hanging columns are selected from hot-dip galvanized square steel pipe columns or H-shaped steel columns;

[0009] S3: Installation of the wire hanging structure, connect the steel wire hanging columns to the building structure columns, set steel wire hanging beams between the steel wire hanging columns, and finally weld the wire hanging plates to the steel wire hanging beams;

[0010] S4: Installation of conductors: Install the conductors on the wire hanging plates to complete the wiring.

[0011] Furthermore, step S1 includes the following steps:

[0012] S11: Establish a combined building structure calculation model with a roof structure: When modeling, first assume the cross-sectional dimensions of the components, and then, according to process requirements, empirical values of column spacing, and floor height requirements, use structural calculation software such as YJK and midas gen to establish a combined building structure model. Reasonably arrange the building frame columns and frame beams, and then arrange the wire-hanging columns and wire-hanging beams;

[0013] S12: Set boundary conditions: Assume that the bottom of the building frame columns is fixed, the secondary beams and frame beams of the building are hinged connections, and the frame beams and frame columns of the structure are hinged connections;

[0014] S13: Add loads: Apply wire loads and other loads as required, and then perform software calculations. The other loads include seismic loads, wind loads, permanent loads, variable loads, etc.;

[0015] S14: Determine the cross-sectional dimensions of the components: Judge whether the cross-sectional dimensions meet the requirements according to the calculation results. If the cross-sectional dimensions do not meet the requirements, modify the cross-sectional dimensions and repeat the above steps until the cross-sectional dimensions of the building frame columns, frame beams, steel wire-hanging columns, and steel wire-hanging beams are finally determined.

[0016] Further, the specific steps of step S3 are as follows:

[0017] S31: Connect the steel wire-hanging columns: If the building is a steel structure, weld the steel wire-hanging columns to the upper part of the building structure columns. After welding, polish them smoothly, and then perform galvanized anti-corrosion treatment on the welding joints; if the building is a reinforced concrete frame structure, connect the steel wire-hanging columns to the building structure columns through bolts;

[0018] S32: Connect the steel wire-hanging beams to the steel wire-hanging columns. Place the rigid wire-hanging beams between the wire-hanging columns. The connection between the steel wire-hanging beams and the steel wire-hanging columns can adopt bolted or bolt-welded connection methods;

[0019] S33: Connect the wire-hanging plates to the steel wire-hanging beams: According to the wire-hanging positions, weld the processed wire-hanging plates to the steel wire-hanging beams.

[0020] Further, the wire-hanging plate includes a hot-dip galvanized steel plate and wire-hanging ears arranged on three sides of the hot-dip galvanized steel plate. Each wire-hanging ear is provided with a wire-hanging hole for installing wires. The three-phase wire-hanging plate is used for hanging incoming and outgoing wires and suspension wires.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] This method has strong plasticity, that is, the wire-hanging plates can be welded at the required positions according to needs. This wire-hanging method is more conducive to design and construction, and is convenient for technical transformation and major repair. This method fundamentally avoids the problems that it is difficult to install wires and difficult to rectify when there are errors in the design and construction of wire-hanging rings in the conventional method. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 is the structural calculation model in the embodiment of the present application;

[0025] Figure 2 is the schematic diagram of the wire hanging board structure of the present application;

[0026] Figure 3 is the elevation layout drawing of the wire hanging structure of the present application;

[0027] Figure 4 is the single - wire schematic diagram of the wire hanging on the top of the building of the present application;

[0028] In the figure, 1 - hot - dip galvanized steel plate; 2 - wire hanging ear; 3 - wire hanging hole; 4 - steel wire hanging column; 5 - steel wire hanging beam; 6 - wire; 7 - structural column; 8 - structural beam. Specific implementation manners

[0029] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the following further details the present application in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] A solution for hanging wires on the top steel structure of a substation building includes the following steps:

[0031] S1: Design of the wire hanging structure

[0032] S11: Establish a combined building structure calculation model with a roof - mounted framework.

[0033] Overall consideration of the wire hanging requirements, determine the positions of the steel wire hanging columns, reasonably arrange the building column grid, and ensure the unity of the layout of the structural columns and the steel wire hanging columns. Use structural calculation software such as YJK and midas gen to establish the combined building structure model. Among them, the steel wire hanging structure can select hot - dip galvanized square steel pipe columns or H - shaped steel columns. When modeling, first assume the cross - section dimensions of the components, and then according to the process requirements, column - spacing empirical values (6m - 9m) and storey - height requirements, reasonably arrange the building frame columns and frame beams, and then arrange the wire hanging columns and wire hanging beams. If the building is a steel structure, the building frame columns and wire hanging columns at the positions where the wire hanging columns are set adopt the same cross - section dimensions.

[0034] S12: Set boundary conditions: Assume that the bottom of the building frame columns is fixed, the secondary beams and frame beams of the building are hinged, and the truss beams and truss columns are hinged.

[0035] S13: Add loads: Apply wire loads and other loads (including seismic loads, wind loads, permanent loads, variable loads, etc.) as required, and then perform software calculations.

[0036] S14: Determine the cross-sectional dimensions of components: Judge whether the cross-sectional dimensions meet the requirements according to the calculation results. If the cross-sectional dimensions do not meet the requirements, the cross-sectional dimensions can be modified and the above steps can be repeated. Finally, determine the cross-sectional dimensions of the building frame columns, frame beams, steel wire-hanging columns, and steel wire-hanging beams.

[0037] S2: After the building structure is constructed, purchase the corresponding steel wire-hanging columns and wire-hanging beams, and process the wire-hanging plates. The wire-hanging plates are hot-dip galvanized steel plates and wire-hanging ears arranged on three sides of the hot-dip galvanized steel plate. Each of the wire-hanging ears is provided with a wire-hanging hole for installing wires, and is used for hanging incoming and outgoing wires and suspension wires.

[0038] S3: Installation of wire-hanging structure

[0039] S31: Connect the steel wire-hanging columns

[0040] If the building is a steel structure, the building frame columns at the positions of the steel wire-hanging columns can be jointly purchased as an integral component with the steel wire-hanging columns. If the transportation of the integral component is difficult, it can be purchased in sections and welded on site. Weld the steel wire-hanging columns to the upper part of the structural columns, and the welds shall meet the requirements of relevant codes. After welding, grind it smooth, and then carry out galvanized anti-corrosion treatment on the welded parts.

[0041] If the building is a reinforced concrete frame structure, the steel wire-hanging columns can be connected to the structural columns by bolts.

[0042] S32: Connect the steel wire-hanging beams and the steel wire-hanging columns. The connection between the steel wire-hanging beams and the steel wire-hanging columns can adopt bolt connection or bolt-welding connection methods.

[0043] S33: Connect the wire-hanging plates and the steel wire-hanging beams. According to the wire-hanging positions provided by the process specialty, weld the wire-hanging plates on the wire-hanging beams.

[0044] S4: Install the wires, install the wires on the wire-hanging plates, and complete the wiring.

[0045] Embodiment 1

[0046] This embodiment provides a method for hanging wires on the steel structure at the top of a substation steel structure building, which includes the following steps: wire hanging structure design, calculating the cross-sectional dimensions of the wire hanging structure; purchasing the wire hanging structure; wire hanging structure installation, that is, connecting the steel wire hanging columns to the building structure columns, arranging steel wire hanging beams between the steel wire hanging columns, and finally welding the wire hanging plates to the steel wire hanging beams, and wire installation. Specifically as follows:

[0047] S1: Wire hanging structure design

[0048] S11: Establish a combined building structure calculation model with a framework on the roof.

[0049] Overall consideration of wire hanging requirements, determine the positions of the steel wire hanging columns, reasonably arrange the building column grid, and ensure the unity of the arrangement of the structure columns and the steel wire hanging columns. The building size of this embodiment is 23m x 14m, the column pitches in the long side direction are 5.5m, 6.0m, 5.5m, and 6.0m respectively, and the column pitches in the short side direction are 6.5m and 7.5m. The building storey height is 6.3m, the wire hanging structure storey height is 8m, and the total height is 14.3m. The building structure and the steel wire hanging structure use H-shaped steel columns. Use the midas gen structural calculation software to establish the calculation model, see Figure 1 for details. Assume that the building frame columns at the wire hanging columns have the same cross-sectional dimensions as the wire hanging columns. The assumed cross-sectional dimensions of the components in this embodiment are shown in Table 1 below.

[0050] Table 1 Component cross-sectional dimensions

[0051]

[0052] S12: Set boundary conditions: Assume that the bottom of the building frame columns is fixed restraint, the secondary beams and frame beams of the building are hinged connections. The framework beams and framework columns are hinged connections.

[0053] S13: Add loads: Apply wire loads and other loads (including seismic loads, wind loads, permanent loads, variable loads, etc.) as required, and then perform software calculations.

[0054] Wire load: When analyzing, input the wire load under the most unfavorable working conditions. According to the information provided by the process specialty, the horizontal tension of the unilateral wire is considered as 17kN, and the vertical load is considered as 5kN.

[0055] Seismic load: The seismic fortification intensity is 7 degrees, the design earthquake group is the third group, the peak acceleration of the basic seismic motion based on class II site is 0.15g, and the characteristic period of the acceleration response spectrum of the basic seismic motion is 0.45s; the seismic fortification category of the building is class B, and the seismic grade is the third level. Check that the damping ratio under frequently-occurring earthquakes in the code is taken as 0.04.

[0056] Wind load: The wind pressure under standard conditions is 0.45kN / m 2 .

[0057] The building structure type adopts a steel frame structure, and the roof adopts a light non-accessible roof. The dead load of the roof is 0.5 kN / m2, and the live load of the roof is 0.5 kN / m2. The linear load of the parapet acting on the beam is considered as 0.5 kN / m.

[0058] S14: Determine the cross-sectional dimensions of the components: According to the calculation, the slenderness ratio of the column, the stability stress ratio of the beam in the y direction, and the strength stress ratio of the components all meet the specification requirements. Therefore, the cross-sectional dimensions of the steel wire-hanging structure are shown in Table 1 above.

[0059] S2: After the building structure is constructed, purchase the corresponding steel wire-hanging columns and wire-hanging beams according to the above design cross-sectional dimensions, and process the wire-hanging plates. The wire-hanging plate in this embodiment is a hot-dip galvanized steel plate and wire-hanging ears arranged on three sides of the hot-dip galvanized steel plate. A wire-hanging hole for installing a wire is opened on each of the wire-hanging ears, which is used for hanging the incoming and outgoing wires and the suspension wire. The thickness of the steel plate is 16 mm, and the hole diameter is 30 mm. See Figure 2 . The wire-hanging ears at the incoming and outgoing wire positions are rectangles of 120 mm x 120 mm, and the exposed corners are chamfered by 30 mm. The wire-hanging ears for suspension are rectangles of 220 mm x 380 mm, and two rectangles of 130 mm x 120 mm are cut off at the exposed part and chamfered by 30 mm.

[0060] S3: Installation of the wire-hanging structure

[0061] S31: Connect the steel wire-hanging columns. In this example, the building is a steel structure. The building frame columns at the positions of the steel wire-hanging columns can be jointly purchased as an integrated component with the steel wire-hanging columns. If the transportation of the integrated component is difficult, it can be purchased in sections and welded on site. Weld the steel wire-hanging columns to the upper part of the structural columns, and the welds need to meet the relevant specification requirements. After welding, grind it smooth, and then carry out galvanized anti-corrosion treatment on the welding part.

[0062] S32: Connect the H-shaped steel wire-hanging beam to the steel wire-hanging column. The connection between the H-shaped steel wire-hanging beam and the steel wire-hanging column adopts a bolted connection method, and the stiffeners are reasonably set. All iron parts are subjected to anti-corrosion treatment.

[0063] S33: Connect the wire-hanging plate to the H-shaped steel wire-hanging beam. According to the wire-hanging positions provided by the process specialty, weld the wire-hanging plates to the wire-hanging beams. The incoming and outgoing wire-hanging plates are welded to the flanges of the H-shaped steel wire-hanging beams, and the suspension wire-hanging plates are welded to the flanges and webs of the H-shaped steel wire-hanging beams, and stiffeners are set at the corresponding positions. The final wire-hanging structure is shown in Figure 3 .

[0064] S4: Installation of the wire. Install the wire according to the process requirements. The final result is shown in the schematic Figure 4 .

[0065] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for hanging wires on the top structure of a substation building, characterized in that: The following steps are involved: S1: Design of hanging wire structure, calculate the cross-sectional dimensions of the hanging wire structure, and determine the amount of steel hanging wire columns and steel hanging wire beams; S2: purchasing steel hanging columns and steel hanging beams according to the quantity determined in step S1, and processing hanging boards; S3: Installation of the hanging structure: connect the steel hanging columns with the structural columns of the building, set steel hanging beams between the steel hanging columns, and finally weld the hanging plates to the steel hanging beams; S4: Wire installation: Install the wires on the wire hanging board to complete the wiring.

2. A method for hanging wires on the top structure of a substation building according to claim 1, characterized in that: The step S1 comprises the following steps: S11: Establish a joint building structure calculation model for the roof frame: When modeling, first assume the cross-sectional dimensions of the components, and then use structural calculation software such as Yingjianke and midas gen to establish a joint building structure model based on process requirements, column spacing experience and floor height requirements, and reasonably arrange the building frame columns and frame beams, and then arrange the hanging columns and hanging beams; S12: Set boundary conditions: Assume that the bottom of the building frame column is fixedly constrained, the building secondary beam and frame beam are hingedly connected, and the frame beam and frame column are hingedly connected; S13: Add loads: Apply wire loads and other loads as required, and then perform software calculations; S14: Determine the cross-sectional dimensions of the components: Determine whether the cross-sectional dimensions meet the requirements based on the calculation results. If the cross-sectional dimensions do not meet the requirements, modify the cross-sectional dimensions and repeat the above steps to ultimately determine the cross-sectional dimensions of the building frame columns, frame beams, steel hanging columns and steel hanging beams.

3. A method for hanging wires on the top structure of a substation building according to claim 1, characterized in that: The step S3 specifically comprises the following steps: S31: Connecting steel hanging poles: If the building is a steel structure, weld the steel hanging poles to the upper part of the building's structural columns, polish them to make them smooth after welding, and then perform galvanizing for anti-corrosion treatment on the welded parts; if the building is a reinforced concrete frame structure, connect the steel hanging poles to the building's structural columns with bolts; S32: Connect the steel hanging wire beam and the steel hanging wire column, and place the steel hanging wire beam between the hanging wire columns. The connection between the steel hanging wire beam and the steel hanging wire column can be bolted or bolted and welded; S33: Connect the wire hanging plate and the steel wire hanging beam: weld the processed wire hanging plate to the steel wire hanging beam according to the wire hanging position.

4. A method for hanging wires on the top structure of a substation building according to claim 1, characterized in that: The steel hanging column described in step S2 is a hot-dip galvanized square steel pipe column or an H-shaped steel column.

5. A method for hanging wires on the top structure of a substation building according to claim 1, characterized in that: The wire hanging plate described in step S2 includes a hot-dip galvanized steel plate and wire hanging ears arranged on three sides of the hot-dip galvanized steel plate, each of the wire hanging ears is provided with a wire hanging hole for installing a wire, which is used for hanging inlet and outlet wires and suspending wires.

6. A method for hanging wires on the top structure of a substation building according to claim 2, characterized in that: The other loads described in step S13 include earthquake loads, wind loads, permanent loads, and variable loads.

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