Research on Rapid Prefabrication System of Segmental Beams Based on 3D Reconstruction
Due to site restrictions and line space limitations,there are great changes in the alignment of rail transit lines,such as frequent occurrences of straight lines,flat curves,and moderate curves on the longitudinal slope and transverse slope.These objective actual conditions put forward higher requirements for fabricated bridge segment manufacturing accuracy and construction efficiency.In this paper,a prefabrication system for various linear segmental beams is proposed,and the template is positioned quickly by using a rapid measurement technique based on 3D reconstruction.When the measurement accuracy is high and the measurement distance is far,this measurement method can not meet the requirements temporarily,but it has obvious advantages in the common short and medium distance measurement in the engineering site.Compared with the total station,the method can save more than50%of the measurement time,reduce the measurement cost by 80%,and can measure multiple points in a single time without requiring multiple people to operate.Compared with the laser scanner,the equipment cost of this method is only 3%of the laser scanner;compared with the tape measure,this method can complete the three-dimensional space measurement and multi-point measurement,and the operation is more convenient.
three-dimensional reconstructionsegmental beam prefabrication systemlong line methodprefabricated pedestal
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