Preliminary Study of Close-Range Photogrammetric Three-dimensional Reconstruction in Engineering Detection

Tengjiao JIANG

School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, CHINA

Abstract: Because there are many measurement points in the large civil engineering structures, and the tradi- tional contact measurement method can not meet the requirements of fully reflecting the structural form, the applicability of close-range photogrammetric three-dimensional reconstruction technology in engineering de- tection is studied. Digital coded mark points are arranged on the reinforced concrete T-beam, and image se- quences with a certain overlap ratio qre collected. In the three-dimensional reconstruction software, the struc- ture is reconstructed with high quality and high precision. The three-dimensional reconstruction model and structure are compared in the crack and the size precision. From the comparison results, it can be concluded that close-range photogrammetric three-dimensional reconstruction technology has high measurement preci- sion, can meet the requirements of the test structure and can directly display the physical information of the structure and surface crack. It would lay the foundation for further research and application of close-range photogrammetric three-dimensional reconstruction.

Keywords: Close-range photogrammetry; Three-dimensional reconstruction; Engineering detection