Line Balance and Drive Bearing in Haulage Work

This paper presents description methods as for both line of balance and drive bearing in a haul work. The line of balance is depicted by coefficient of concordance, which is a ratio of the precedent pitch time to the successive one in a haul work. Pitch time means hours worked per throughput in each work cell. The drive bearing represents appearance and motion in driving. The drive bearing is shown by quantitative indices. These might impact construction efficiency of haul work. In this study, a backhoe and a dump tuck are chosen as examples of construction machinery. The description methods reported in this paper could provide site-manager and supervisors with suitable indices to guide or instruct workers under their control with the objective of increasing construction efficiency and energy-saving.