ABSTRACT
OSV (On Site Visualization) in which the measured information is shared visually on a real time basis at site was introduced by Akutagawa in 2006 and it has been applied at various construction sites effectively. The basic function of OSV device is to show the change of deformation, pressure, inclination, etc of the structure as well as the ground by the colored light, namely blue, yellow and red through Light Emitting Converter (LEC) and LED lights electrically. Through those experiences, we recognize one of the big issues is the cost of OSV devices to utilize them at large area for more effective OSV operation. The simple monitoring devices without electricity are sufficient to monitor fundamental ground movement and low cost mechanical OSV devices are introduced at Bai Chay approach road as first trial of mechanical OSV monitoring.
