Application of Reflectorless Total Station in Bridge Detection and its Accuracy Analysis

Abstract

In order to solve the problem of the linear measurement of arch ring for the detection of bridge,a new method is presented that measures the arch ring using a reflectorless total station on the side of the arch bridge and the detail operations are given. Taking account of weakness of edge suveying using a reflectorless total station,some formulas on the 3d coordinates calculation of the above and down edge of the arch ring based on the arch ring points are deduced.According to the law of error propagation, the accuracy of the X and Z axial coordinates are analysed.It is helpful for calculating lateral and vertical deformation and biridges elevation map that the transformation from free-station coordianates to the birdge axis coordinate by programming using EXCEL software is achieved.The method is used for bridges arch ring axial measurement in Qingcheng town,Yuzhong county,Gansu province,and its deformation is consistent with the measured results of the dial indicator,which satisfies the requirement of bridge detecton accuracy.So it is showed that the method is a good way of linear measuring of bridges arch ring.

Automated Estimation of Reinforced Precast Concrete Rebar Positions Using Colored Laser Scan Data

“…Furthermore, due to the large amount of manual work involved, the quality assessment results from manual inspection are error prone and subjective. In recent decades, electronic survey devices such as total stations and laser range finders have become available (Suo et al., ; Koo et al., ). Although they provide faster and more accurate measurements, they still do not have sufficiently high sampling rates for high‐density surveying of construction components (Fröhlich and Mettenleiter, ).…”

Application of Reflectorless Total Station in Bridge Detection and its Accuracy Analysis

“…In recent years , with increasing of the number of damaged bridge and frequently occuring of bridge accidents, it is extremely urgent that bridges are detected, evaluated, repaired and reinforced [1]. Arch bridge is a type commonly used bridge in our country [2]. In the long-term action of dynamic load and the surrounding environment, vertical axis of arch ring (rib) of arch inevitably occur foundation settlement [1], damaged concrete seepage [3], the change of arch and deflection [4].…”