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List of products by author: S. Ito
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Application of a Rapid Non-Core Drilling Exploration Ahead of the Tunnel Face using Water-Powered Hammer Drilling on...
Abstract: Generally speaking, in order to survey the geological conditions existing ahead of the face, tunnel excavation must be discontinued temporarily, and therefore it is necessary to bore over a long distance in as short a time as possible. To overcome these requirements, we have developed an exploration system with a water-powered hammer of down-the-hole drilling type, which is capable of surveying...
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Experimental Study on Strength and Deformation of Fiber Blended Drymix Mortar Sprayed in Order to Prevent a Rockfall...
Abstract: In this study, we sprayed a fiber blended drymix mortar, and a concrete with powdered or liquid accelerator to a rough plate of granite mounted on a punching experimental equipment. Those strength and deformation were measured and compared by its equipment with a three-dimensional laser scanner. As a result, the redundancy of the fiber blended drymix mortar sprayed was superior to that of the...
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Monitoring and Characterization of Water Leakage Behavior for Aged Concrete Lining of Urban Metro Lines by Using...
Abstract: A series of laboratory tests and field measurement were conducted to monitor water leakage behaviour from cracked concrete wall for an aged subway tunnel. Tokyo Metro, operating a total of 195km of urban rail networks of which 167km is underground, regards important that water leakage behaviour be appropriately grasped over time such that periodical manual investigation and the following...
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