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List of products by author: H. Minakami
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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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Development of the New Joint (SB Joint) for Shield Tunnels
Abstract: Traditionally most segments of shield tunnels built in soft ground like that of Japan are solidly connected by bolts. However, in the interest of eliminating the need for secondary lining, speeding up construction and decreasing costs, segments with smooth inner surfaces have become mainstream in Japan in recent years. Thus, various types of one-pass joints, by which tunnels are lined by simply...
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Influence of Structural Opening on the Behavior of Existing Structures
Abstract: When creating an opening in a sidewall of an existing cut-and-cover tunnel, safety verification should be carried out for fear of decrease in rigidity of the node connecting the upper slab and the sidewall. The decrease in the rigidity of the node connecting the upper slab and the sidewall results in an increase in vertical displacement along the upper slab span, and for this reason, the inner...
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Safety of Subway Structures in Proximity of New Construction of a High-Rise Building
Abstract: Underground spaces in the Tokyo Metropolitan area have dense clusters of infrastructure facilities such as subways, and their effects must be taken into account when a building is to be constructed. In addition, the ground in the Tokyo area consists of deposits of soft soils, which exert further remarkable effects. When a high-rise building is constructed in the proximity of an existing subway...
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