A method for monitoring the section shape of steel truss girders during construction of long-span cable-stayed bridges

Abstract

The invention relates to a method for monitoring a section shape of a steel truss in large-span cable-stayed bridge construction process. The method comprises the steps of arranging LED (Light Emitting Diode) lamps at angular points of the section of the steel truss, carrying out primary imaging on the section shape of the steel truss by using a lens and a CCD (Charge Coupled Device), and computing the relative coordinate values among the angular points of the section of the steel truss through a gravity center positioning recognition algorithm so as to achieve the aim of monitoring the section shape of the steel truss in the construction process and then determine whether the section shape of the steel truss needs to be further adjusted, wherein the LED lamps are respectively displayed as a hot spot in the image. According to the method for monitoring the section shape of the steel truss in large-span cable-stayed bridge construction process, a noncontact manner is used, so that convenience is provided, the equipment cost is low, the operation is simple and easy, the manpower and the material resources are saved, the monitoring frequencies on the section of the steel truss can be improved during the construction process and the construction process can be well instructed.

Description

Technical field [0001] The invention relates to the construction of a large-span cable-stayed bridge, in particular to a method for monitoring the section shape of a steel truss girder during the construction of a large-span cable-stayed bridge. Background technique [0002] During the construction phase of the cable-stayed bridge, the consistency of the cross section (also called the section) of the beam is an important guarantee for closure. [0003] The girder of a long-span cable-stayed bridge is generally divided into box girder and steel truss girder. The box girder is factory prefabricated and is hoisted in sections. The shape of the girder body section is standardized in advance and has nothing to do with on-site construction. The beam body is formed by splicing multiple members on the construction site. As the beam body extends, the manufacturing errors and erection errors of the members will cause the shape of the beam section to gradually become inconsistent, and this er...

AI Technical Summary

Problems solved by technology

Existing methods rely heavily on the weather, which will inevitably affect the construction period, and it is not convenient to measure each corner point in turn

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