Tokyo Metro Co., Ltd. is constructing the No.13 subway line 8.9km long between Ikebukuro and Shibuya. This project includes a section 1, 245m long between Zoshigaya station and Nishi-Waseda station (tentative station names), where two single-track shield tunnels of 6, 600mm in segment outer diameter will be constructed in parallel. Since this section crosses a river, the longitudinal alignment is Vshaped, requiring construction of a pumping station at a depth of 40m under highly pressurized groundwater.
This paper discusses the result confirmed that adesign method was proper and the suggestion of a simple calculation method aboutthe non-open cut method of construction