The Development of low cost OSV (On-Site Visualization) devices and its application on Hanoi Metro Line 2

OSV (On-Site Visualization) is a monitoring system in which measured information is shared visually on a real time basis at site. It was introduced by Akutagawa in 2006 and it has been applied at various construction sites in Japan and overseas projects. Through OSV application on various overseas projects, it has been recognized that a major problem with OSV system is the high cost of electrically driven OSV devices needed to cover many locations for a more effective OSV operation. Based on the above observation, low cost OSV were developed and trial installation was conducted at the slope of National Highway in Vietnam. Hanoi Metro Line 2 has been implemented since Mar 2011 under Japanese ODA and the construction works start in 2015. Because the underground station has deep open excavation works located at downtown in Hanoi, the careful construction operation with instrumentation and monitoring are required. In this paper, the plan of various type of OSV installation on Hanoi Metro Line 2 is proposed and the effectiveness of OSV monitoring is examined.