Abstract
In Japan, many of the highway bridges intensively developed during the high economic growth period are deteriorating; it is the urgent need to develop a proper repair plan to extend the service life of those bridges. To develop proper inspection and repair plans and to select a proper construction method, it is necessary to precisely grasp the geometry of the current status. However, in performing the resurvey work on the site, accompanying actions such as suspension of traffic become necessary. Therefore, it is difficult to conduct the work over about 700,000 bridges across the nation in terms of costs and human resources. To solve these problems, a method of visualizing the current status for the superstructure of the highway bridge three-dimensionally using MMS, which does not require suspension of traffic, has been proposed. However, as MMS can measure only the area facing the road, the generated geometry is a surface model represented with polylines without thickness, which is not designed to represent the whole superstructure of bridge. In addition, it is impossible to make the product model of a bridge substructure. Thus in this research, we propose a method of generating a three-dimensional (3D) whole model of the superstructure and substructure of a bridge from the point cloud data measured using the ground-installationtype laser scanner and UAV.
