Development of Marking System for Construction

In the history of construction, marking has been one of the most critical work items, including some difficult and troublesome points which need to be solved urgently; basically, marking work has been performed resorting to human labor by two workers, necessitating complicated preparation steps especially for marking at higher positions. Considering these requirements, with labor saving and enhancement of safety on target, we started the development of an automatic marking system which is capable of completing accurate marking work in a short span of time. The automatic marking system is designed with a rotary laser emitter and with a marking pen which traces the marking line drawn by the emitter; with this system, the marking pen is able to mark an accurate linear line even if the hand holding the marking unit oscillates during work. This paper reports the summary of the marking system and its application to construction sites.