Displacement control method for arch bridge lattice girder hoisting to eliminate temperature influence

Abstract

The invention discloses a method for controlling the hoisting displacement of an arch bridge lattice girder eliminating the influence of temperature. Taking the arch bridge with suspenders as the engineering object to carry out displacement control in the process, by introducing a temperature correction factor, the displacement of the hoisting construction of the arch bridge lattice girder is controlled, so as to eliminate the influence of temperature on the displacement of the lattice girder and reduce the temperature of the hoisting lattice girder The least impact is used as the objective function, and the displacement of the controlled bridge is closest to the reasonable bridge state as the constraint condition for analysis, which solves the problem that the displacement of the lattice girder is not easy to control due to the influence of temperature, and avoids the unevenness of the bridge deck and the driving comfort It greatly shortens the construction period of arch bridge lattice girder hoisting, reduces the risk of being forced to choose night construction, saves economic costs, has broad promotion and application prospects, and brings huge economic benefits. benefit.

Description

technical field [0001] The invention relates to the technical field of transportation bridge and culvert engineering, in particular to a method for controlling the hoisting displacement of arch bridge lattice girders that eliminates the influence of temperature. Background technique [0002] my country is a big country of arch bridges, and it is also a strong country of arch bridges. The arch bridge with the largest span in the world is a 575m concrete-filled steel pipe arch bridge under construction in China. Jiangyi Bridge, China's 500-meter-level arch bridge is currently developing vigorously, and the corresponding construction technology is also constantly innovating and improving in practice. Whether the smoothness of the bridge deck affects the driving comfort and the life of the boom is a problem that must be considered during the construction process. There are many factors that affect the alignment of the bridge deck after the completion of the bridge. For the steel...

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Problems solved by technology

The influence of temperature on the construction of steel structure bridges has become a factor that cannot be ignored, and even becomes a part of the load control in design and construction. To completely eliminate the influence of temperature, each construction section must be completed at the design reference temperature. Obviously It is unrealistic, especially in the hot summer season, the surface temperature of the steel structure is close to 60 ℃, which is much higher than the closing temperature, and the temperature rises. Due to thermal expansion and cold contraction, the boom elongates, the lattice girders and suspenders on the bridge deck elongate, The vault will tilt, and the displacement is difficult to control, which will seriously affect the construction accuracy and the force of the suspenders after the bridge is completed, resulting in uneven alignment and shortened life of the suspenders, resulting in uneven bridge decks, poor driving comfort, and vehicle speeds that cannot meet the design requirements , Poor traffic capacity and other issues

This phenomenon is very common. Builders can only take into account the progress and quality. Most of them choose to work at night to reduce the impact of temperature, but this will inevitably lead to poor construction control accuracy, especially the precise control of displacement, low work efficiency, and long construction period. Forced to extend, there are many sources of risk in nighttime construction, high construction risk, low utilization rate of human resources, and construction cost will rise linearly. How to effectively reduce the impact of temperature is an urgent task

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