System for measuring bridge bottom deformation by aid of laser ranging method

Abstract

A system for measuring bridge bottom deformation by aid of a laser ranging method is formed by a bridge bottom settlement change measuring device and a ground settlement change measuring device, wherein the bridge bottom settlement change measuring device comprises a plurality of laser ranging instruments, a plurality of prisms, a data processing terminal and a computer, and the ground settlement change measuring device comprises a horizontal laser emitter and a plurality of scales. According to the system, the bridge bottom settlement change measuring device on the system is used for measuring deformation data of the bridge bottom relative to the ground, simultaneously the ground settlement change measuring device is used for measuring ground settlement change data, then the data are processed comprehensively to be used for determining deformation conditions of different stages of the bridge bottom in the construction process. Therefore, measuring time can be reduced, accuracy is high, error is small, and improvement of construction quality of a bridge is benefited.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a system and a measurement method for measuring the deformation of a bridge bottom by using a laser ranging method. technical background [0002] At present, most of the bridge construction in our country adopts various forms of scaffolding method for in-situ cast-in-place construction. In the construction process, in order to ensure the overall stability of the scaffolding and meet the safety requirements of beam pouring construction, the scaffolding is often inspected by preloading, and the deformation of the scaffolding is observed at the same time to ensure the construction line of the beam body Consistent with the design line type. [0003] In the past, the observation of the deformation of the scaffolding was usually carried out by manual observation. For example, hanging vertical wooden strips under the formwork at the bottom of the beam. The lower end of ...

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Problems solved by technology

[0003] In the past, the observation of the deformation of the scaffolding was usually carried out by manual observation. For example, hanging vertical wooden strips under the formwork at the bottom of the beam. The lower end of the wooden strips is 0.2m from the ground. The disadvantage of this construction measurement method is that it takes a long time to observe once, and because the length and thickness of the wooden strips are relatively large, it is easy to swing in the air, and the accuracy of observation is poor, and the error is large. At the same time, manual measurement operations are occasionally performed. Errors will also occur, and these factors will ultimately affect whether the construction linetype of the beam body is consistent with the design linetype

In addition, this measurement method cannot effectively prevent the collapse of the scaffolding during the preloading process, let alone observe the deformation of the beam bottom during the use of the bridge

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