Study on automatic search for center position of high strength bolts using registration to point clouds

Abstract

During maintenance work on steel bridges, new members are added to or replaced with existing members for repair and reinforcement. By measuring three-dimensional point clouds, it is possible to grasp the shape and dimensions of existing members in detail. However, it takes time to create a three-dimensional model from point clouds, and automatic processing is required to improve efficiency. Furthermore, although existing high-strength bolt holes are often used when replacing parts, there is no established program to automatically extract the center position of high-strength bolts. In this study, we examined the algorithm for searching the center position of high-strength bolts from point clouds and the parameters for the types of high-strength bolts, and demonstrated that the search can be performed with the accuracy required for joining steel bridge members.