Application of Sensor Technology for Warning Unsafe Conditions from Moving Objects above Construction Workers

Moving objects above construction workers is one of the major causations of accidents at construction sites. The dynamic and complex nature of construction sites can lead to the above unsafe conditions. However, previous research has developed sensor system for detecting the accident which can only be applied to crane prototype in laboratory. The objective of this research is to develop a sensor warning system (SW system) for warning construction workers from unsafe conditions. This study focuses on a lifting operation of the tower crane. The SW system is developed based on the Internet of Things (IoT) concept, GPS sensor, and server. In this paper, the pilot test was conducted on testing GPS devices which could lead to determine the distance error and calibrate the system. As a result, the average of distance error was 1.96 meters for calibrating the system. Further study will continue to develop the full-scale system which can be applied to construction site.