Detecting the Hazards of Lifting and Carrying in Construction through a Coupled 3D Sensing and IMUs Sensing System

Abstract

Construction companies in Hong Kong suffer huge losses due to labor fatalities and injuries. More than 25% of all of the injuries and fatalities in all industries in Hong Kong are caused by the construction industry. Different from the U.S., whose top injury cause is fall to lower level for fatal injuries (34%) and nonfatal injuries (23%); the most frequent type of injuries in Hong Kong is lifting and carrying (19.2%). Recently, automated 3D sensing systems (Kinect) have been employed to identify motion related hazards to improve construction safety condition. However, limitations (such as extreme light conditions, occlusions and misrepresentations) of 3D sensing systems hinder its application in engineering practices. To resolve those limitations, this research proposed a coupled system, which integrates and synchronizes the Kinect with Inertial Measurement Unit (IMUs). With the help of the coupled system, IMUs could uninterruptedly collect motion data (accelerations and angular rates) even under extreme light conditions or under occlusions; while Kinect could provide a reference system for IMUs to construct postures. The whole sensor network will be able to capture complete and reliable data, even if Kinect fail to work properly. Moreover, the proposed coupled system will also promote other human related research, such as productivities and labor tracking.