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  Planning of urban railway tunnel using the extruded concrete lining system with shield - Nishiya Tunnel on The through lines between Sotetsu line and JR line -

  The Nishiya Tunnel on the through lines between the Sotetsu line and the JR line is a regular line double-track sectional tunnel 1,446 m long, leading from Nishiya Station to Hazawa Station (tentative name) in Yokohama City, Japan. This tunnel is being constructed using the SENS method (cast-in-place support system using a shield). SENS is a tunnel support system in which, concurrently with the shield tunneling excavation, concrete is pressurized and placed at the shield tail section to provide Extruded Concrete Lining (ECL) that will serve as the primary lining. This paper discusses the execution plan (study of primary lining concrete) for the Nishiya Tunnel, which represents the first use of SENS in an urban area.

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