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  Experimental Trial of Three-Dimensional Location Detection of Workers Using the Safeguarding Supportive System (SSS) at a Tunnel Construction Site

  The number of industrial accidents at tunnel construction sites in Japan has been gradually decreased because of development of construction technology and/or promotion of machinery construction. However, when accident occurs once, degree of severity is big. Work circumstances of tunnel worker remains unstable because safety at a lot of tunnel work-sites are still dependent on workers attentiveness. We established a safety measure, the Safeguarding Supportive System focusing on residual risks, which are left after 3-step method. The SSS counts entry/exit of worker at work-sites, confirms authority and license of worker, controls machine condition, and detects location of workers at real time. In the present study, we developed an UWB-3-dimensional position detecting system in the SSS, and evaluated validity of the system. We examined if the system enabled to monitor the location and the working posture of workers even if they were in a blind spot or in unclear-sighted condition in the tunnel construction site. As judgment indices of posture and condition of workers, angle, acceleration, heights and elapsed time of posture or workers were measured. Those results were integrated and classified into conditions of run, walk, falls down and crouches. We concluded that the UWB-3-dimensional position detecting system established in the present study was useful even if the condition of work-site was not good. We are planning to examine other systems in the SSS in the further study.

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