PRODUCTIVITY ANALYSIS OF SAFETY NETS INSTALLATION AND DISMANTLING IN STEEL CONSTRUCTION

Abstract

Despite a reduction in the number of fatal accidents compared to the previous year, fall-related incidents still accounted for 251 deaths (42.0%), underscoring the continued need for construction accident prevention. Korea South-East Power Co., Ltd. (KOEN) operates the “KOEN Safety Design System”, which is based on Design for Safety (DfS) principles. Utilizing the system’s library, KOEN has implemented fall protection about safety nets installation and dismantling procedures that incorporate steel-frame accessories used during structural steel erection. Consequently, the need for productivity analysis due to the simplification of work procedures has been identified. Random sampling and the central limit theorem were employed to derive a normal distribution for the average work time associated with safety nets installation and dismantling at a height of 4.0 meters. To compare these results with standard unit work times, a statistical test was conducted on work performed at a height of 7.4 meters. When steel-frame accessories were provided, the difficulty of the task was significantly reduced. Looking ahead, this study aims to enhance the reliability of productivity assessments by measuring work speed while accounting for variables such as crew composition, working height, and structural configuration. The goal is to support BIM-based scheduling and cost estimation, as well as on-site safety management, through the broader application of DfS principles.