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List of products by author: Y. Tezuka
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Development and application of automatic concrete placement system for tunnel lining
Abstract: In recent years, the construction industry in Japan suffers a huge shortage of skilled workers due to aging population, and to make up for these problems, we are promoting the mechanization and automation of construction works. However, the placement of tunnel lining concrete is carried out in a narrow and closed traveling formwork and the compaction work by human power using internal vibrators...
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Development of New Composite Segment and Use in the Field
Abstract: The Keio Corporation buried its at-grade train lines to alleviate traffic around Chofu Station. Underground shield tunnels were constructed for a total of four tracks (two on the main Keio Line, two on the Sagamihara Line) as part of a series of projects. The four shield tunnels comprise mainly primary-lined reinforced concrete segments (hereafter “RC segments”) built atop or beside one another...
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New Three-dimensional Deformation Measurement System by Laser Scanner Integrated with Image Processing Technology
Abstract: 3D laser scanners can make detailed measurements of the configuration of objects such as structures and may be used to measure two-dimensionally the surface configuration of a tunnel wall, and technology to apply this equipment to measure displacement of tunnels has recently been developed. However, measurements using a 3D laser scanner can obtain only the surface configurations at the moment...
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