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  The adoption of the SENS in an urban railway tunnel

  The Nishiya Tunnel on the Sotetsu - JR Through Line is the first project to be executed in an urban area with the “extruded concrete lining system with shield” (hereafter SENS). This is the third case that the SENS has been used; previously, it had been used to construct the Sanbongihara Tunnel on the Tohoku Shinkansen (bullet train) Line and the Tsugaru-Yomogita Tunnel on the Hokkaido Shinkansen Line. However, the previous two cases were the tunnel construction in a mountainous area. This tunnel is the first trial of the use of the SENS in an urban area with many adjacent structures. The primary characteristic of the SENS is that extruded concrete is used for the primary lining instead of segments.

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