EVALUATION OF CONSTRUCTION QUALITY USING 3D LASER SCANNING AND AS-DESIGNED BIM MODEL

Abstract

Given the advancement and global adaptation of technology, The Building and Construction Authority (BCA) aims to improve the work process and raise productivity of the complex and unique built industry. One strategy would be the introduction of Building Information Modelling (BIM). BIM allows for relevant partners and stakeholder to store and share data in a common location, which promotes better communication and coordination, making this tool an inevitable one for a successful project. The function of BIM is limitless, especially when paired with three-dimensional (3D) scanning technologies. It allows for scanning to measure any type of construction environment, improving quality inspection and finally assisting to deriving accurate quantity calculations. Diving into the multi functions of 3D laser scanning, this paper strives to compare and evaluate the physical construction quality with the as – designed BIM model. Using the newly built School of Design and Environment 4 (SDE 4) in National University of Singapore (NUS), an experiment will be carried out. Point cloud data taken by a suitable 3D laser scanner will be exported, cleaned and compared with the As-Designed (AD) BIM model. Comparison criteria will involve statistical tests, code of practice in Singapore and finally global standards. In the experiment, many different aspects of the laser scanner were compared against the AD BIM model. Areas of discussion includes the different discrepancies in geometry, standard deviation and also the extend of error between the different views. The result has showed that some elements such as staircase are more prone to errors. In general, the experiment covers many different ways of evaluating the construction of SDE 4. The experiment also convinces and evidently shows the advantages of utilising the 3D laser scanner.