Available online at 2019.creative-construction-conference.com/proceedings/ CCC 2019 Proceedings of the Creative Construction Conference (2019) 114 Edited by: Miroslaw J. Skibniewski & Miklos Hajdu https://doi.org/10.3311/CCC2019-114 *Corresponding author: Bikash Lamsal, email: lamsal@kajima.com Creative Construction Conference 2019, CCC 2019, 29 June - 2 July 2019, Budapest, Hungary Development of an AR system for the advancement of the tasks in the construction sites Bikash Lamsal a *, Kyosuke Kunichika a , a Kajima Technical Research Institute, Kajima Corporation 182-0036 Tobitakyu, Chofu, Tokyo, Japan, lamsal@kajima.com Abstract In this paper, we developed an AR (Augmented Reality) application for productivity improvement in the construction sites. We developed this system for upgrading the ancient methods of construction by using the AR Technology. The main concept of this system is to use the AR technology for visualizing the completed form of the buildings, reforming the “construction management” and improving the productivity on the construction sites. This system can be used for the “presentation of the completed models” for early decision of the task to be performed, “safety work confirmation” for eliminating and reducing the dangerous tasks, “visualization of completed model before the completion of the buildings” for eradication of serious mistakes on quality of t he buildings to be build. Generally, the AR system is used along with various types of head worn devices like Head mount displays or Google glass, but they are not realistic for the construction workers or in the construction sites. Our application works on iPad® ® and tablets which is easy to use and is a realistic form of using AR in the construction sites. Our application is developed in such a way that, the AR model generated from the BIM (Building Information Modeling), projected on 1:1 scale in a real space is continuously displayed in a smart device following the movement of the person holding the tablet. As a person moves holding the tablet, the position and orientation of the tablet is tracked, and the model follows the tablet. The developed system is experimented on the building construction sites in Japan. The experiments were conducted by developing the AR models from the BIM model of the various areas of the architectural construction sites. The experimental results reflect the effectivity of our AR system for increasing the productivity of the construction sites. © 2019 The Authors. Published by Budapest University of Technology and Economics & Diamond Congress Ltd. Peer-review under responsibility of the scientific committee of the Creative Construction Conference 2019. Keywords: Architecture; Augmented Reality; Building Information Modeling (BIM); Construction; 1. Introduction Augmented Reality (AR) is a Computer vision system that gives a view of the real world where the elements are superimposed by computer generated files as graphics, sounds, videos or digital information. AR was first developed in 1968 by Ivan Sutherland at Harvard, where the users were able to experience the computer graphics that made them feel being in the alternate reality. Been around for numerous decades, various developments have been made in the field of AR. The implementation of AR in the medical and various other fields are spreading as a part of business innovation but AR technologies were not applied on construction sites due to the tracking and alignment problems in the construction sites, instead they were used at the office for simulation or collaboration during the design phase of a project. In the recent years, a huge development in the field of AR technology have been made, which shows the possibilities of applying the AR in the field of construction sites. The construction industry is dependent on visual imaging solutions for achieving the functions related and performance related information. One of the leading