Geometric Accuracy Evaluation Method for Subway Stations Based on 3D Laser Scanning

Abstract

The rapid development of three-dimensional (3D) laser scanning technology has provided a new technical means for the geometric accuracy evaluation of subway stations. With high precision and high efficiency, laser scanning technology can present the construction site condition in a panoramic way, which is essential for achieving high precision and all-round geometric accuracy evaluation. However, when the survey coordinate system of the design building information modeling (BIM) predefined in the design stage is not applied during the laser scanning data acquisition or the BIM loses the survey coordinate system during the interaction, the objects will have different coordinate positions in the point cloud and BIM, which will limit the accuracy comparison between the two data sources. Meanwhile, the existing methods mainly focus on the above overground buildings, and the accuracy evaluation of underground structures mainly focuses on the overall deformation monitoring. So far, the existing methods do not constitute a hierarchical index system to assess the geometric accuracy of various objects in the subway station. This study proposes a method to evaluate the geometric accuracy of subway stations based on laser scanning technology. A coarse-to-fine coordinate registration from point cloud to the design BIM is used to unify coordinates in different reference systems; and geometric accuracy evaluation of different structures in subway stations is achieved by developing geometric accuracy evaluation indexes and technical systems. The method is applied to the geometric accuracy monitoring of the Hongqi Road subway station, and the experimental results verify the reliability of the method.

Practicalities of Incorporating 3D Laser Scanning with BIM in Live Construction Projects: A Case Study

“…The use of laser scanning technology has gained significant popularity in the AEC industry. It enables the capture of spatial characteristics of objects, offering benefits such as high accuracy, abundant geometric data, and rapid data collection [24]. The accuracy of data obtained through 3D laser scanning technology can be influenced by various factors, such as the type of device used, the distance between the device and the target depending on the device's specs, and the complexity of scanned objects.…”

“…The swift adoption of 3D laser technology within construction projects is due to its ability to facilitate redesign, easy integration with BIM, digital twins, clash detection and analysis, visualisations, and improved construction safety assessments. Therefore, understanding these applications' technical characteristics and details is crucial in determining 3D laser scanning technology adoption in construction projects [24,25], as indicated in the objectives of this article in Section 2. Moreover, laser scanning technology utilises laser light to capture spatial data, including height, longitude, and latitude in three coordinates, resulting in millions of points forming unstructured Point Cloud Data (PCD) [26][27][28].…”

Scan-to-HBIM Reliability

“…Bonduel et al [14] propose a standardized method for assessing scan-to-BIM accuracy based on a quality evaluation on a macro-scale followed by an analysis of the individual BIM elements (micro-scale). On the other hand, Wang et al [15] apply the issue of reliability assessment to the BIM model of a subway station.…”

Full-Section Deformation Monitoring of High-Altitude Fault Tunnels Based on Three-Dimensional Laser Scanning Technology

“…The 3D scanners currently in use are based on the principle of laser ranging. By calculating the 3D coordinates of a large number of dense points on the surface of an object to be measured by recording its distance from the measuring device, horizontal and vertical angles, and reflectivity, the 3D model of the object can be quickly reconstructed along with the associated diagram data, such as lines, surfaces, and bodies [ 11 , 12 , 13 , 14 ]. Because 3D laser scanning can obtain the surface information of objects with a panoramic view, high precision, and fast speed, it is widely used in various civil engineering applications such as automated modeling, construction progress tracking, construction safety management, and automated construction [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ].…”