A METHOD FOR MONITORING BULGE OF ANCIENT CITY WALL AFTER REPAIR
- 1School of Geomatics and Urban Spatial Informatics, Beijing University of Civil Engineering and Architecture, No.15 Yongyuan Road, Daxing District, Beijing; 102616, China
- 2Beijing Key Laboratory for Architectural Heritage Fine Reconstruction and Health Monitoring, No.15 Yongyuan Road, Daxing District, Beijing; 102616, China
Keywords: Heritage protection, City wall diseases, Bulge extraction, Coordinate transformation, Deformation monitoring
Abstract. The ancient city wall is affected by factors such as environment and man-made factors, and the formed bulging disease is particularly prominent, and even caused irreversible damage to the ancient city wall. Therefore, the bulging monitoring after the repair of the city wall should be the top priority of the deformation monitoring of the city wall. This paper proposes a new plan for monitoring the bulge after the repair of the city wall. According to the point cloud data before the repair, the characteristic plane is fitted to determine the bulge range of the city wall, and then observation signs are placed on the surface of the repaired city wall at the corresponding location where the bulging deformation is severe. By using a total station to monitor the space coordinates of the observation signs, the deformations perpendicular to the wall can be obtained through coordinate conversion, and then the bulging of the repaired city wall can be determined. The actual application results show that this method can effectively monitor the swelling of the ancient city wall after the repair.