SYNOPSIS

In urban areas, there is a demand to maintain adjacent existing tunnels or structures in good conditions, such that they are not adversely impacted by new construction activities. Therefore, it is important to monitor the deformation of these existing structures with high accuracy, where a substantial accuracy in displacement transducers are required. This talk is about the effectiveness of both stable and high precision in-tunnel deformation measurements, rock deformation measurements, and underground structure displacement measurements. The instrumentation which will be mentioned is not influenced by temperature changes, but is also stable in monitoring over a long period of time.

This talk will provide a few case histories from practical experiences in Japan, for example, the Horonobe Underground Research Laboratory (Horonobe URL), project of the Japan Atomic Energy Agency (JAEA) planned at Horonobe-cho in northern Hokkaido, Japan.


BIODATA OF SPEAKER

Mr. Sendo Hiroshi is a machine design engineer, and is the president of Sendo Mechanism Design. He graduated in 1988 from the Department of Mechanical Engineering, National Institute of Technology, Kagoshima College, Japan. He has developed various measuring instruments with instrumentation manufacturers.

In 2006, Sendo Mechanism Design was founded to develop and manufacture displacement transducers with original environmental resistance (heat resistance and water pressure resistance). Sendo Mechanism Design develops and manufactures displacement transducers mainly for monitoring in tunnel, rock and underground structures. In recent years, Sendo Mechanism Design has been involved in the monitoring of a nuclear fuel waste disposal site laboratory which is 350 m underground.