A method for evaluating the overall state of transmission line iron towers
A technology for transmission line towers and overall status, applied in data processing applications, instruments, calculations, etc., can solve problems such as corrosion, bending of tower structural members, affecting the safety of transmission lines, etc., to achieve the effect of easy understanding and simple theory.
Active Publication Date: 2020-08-18
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
[0002] Due to the long-term load, wind, sun, rain erosion and other environmental effects on the transmission line, the structural components of the iron tower will appear bending and corrosion, which poses a safety hazard to the operation of the transmission line, and some have seriously affected the safety of the transmission line.
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Embodiment 1
[0072] The invention of this example provides a method for evaluating the overall state of a transmission line iron tower. If the iron tower is regarded as a lattice cantilever beam, the iron tower is composed of countless continuously changing cross-sections, and the cross-section of the iron tower can be calculated according to the beam design theory. for analysis. Such as figure 1 Shown is a section of the tower body, such as Figure 2-3 Shown are front and top views, respectively, of a cross-section over the internode, Figure 4 A schematic diagram of the calculation of the cross section. Local member damage will lead to a decrease in stiffness, an increase in deformation, and a decrease in the ultimate bearing capacity of the cross-section in which the member participates. When the ultimate bearing capacity is 0, all the components in the cross section fail, and the tower may overturn here.
[0073] Define the cross-section bearing capacity reduction factor ω
[0074...
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The invention relates to a method for estimating overall state of a transmission line iron tower. The iron tower is considered as a latticed cantilever beam and is formed of a plurality of continuously variable iron tower cross sections. The method comprises the steps of determining a physical quantity of the iron tower cross sections; when the shearing strength and the torsional strength of a damaged iron tower cross section are calculated, determining a transverse load and a longitudinal load of the damaged iron tower cross section in a rectangular coordinate system through verification of yield strength of each rod member in the damaged iron tower cross section; determining a bending moment of the damaged iron tower cross section; when the tensile strength, the compression strength and the bending strength of damaged iron tower cross section are calculated, determining a vertical load of the damaged iron tower cross section in the rectangular coordinate system through verification of the yield strength of each rod member in the damaged iron tower cross section; and determining and defining a cross section bearing capacity decreasing coefficient omega through the transverse load, the longitudinal load and the vertical load. The technical scheme is simple in theory, easy to understand and efficient when in use in combination with a computer.
Description
technical field [0001] The invention relates to the field of evaluation of transmission line iron towers, and more particularly relates to a method for evaluating the overall state of transmission line iron towers. Background technique [0002] Due to the long-term load, wind, sun, rain erosion and other environmental effects on the transmission line, the structural components of the iron tower will appear bending and corrosion, which poses a safety hazard to the operation of the transmission line, and some have seriously affected the safety of the transmission line. Therefore, in order to strengthen the whole process management of overhead transmission lines, grasp the safety and health level of transmission line towers in a timely manner, and ensure the safe and stable operation of old transmission line towers, it is urgent to research and develop advanced and applicable transmission line tower structure safety state detection and evaluation technology. Scientifically guid...
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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/20G06Q50/06
Inventor 高雁
Owner CHINA ELECTRIC POWER RES INST