The face is stabilized against earth pressure and underground water pressure of the tunnel face by controlling the earth pressure inside the cutter chamber filled with excavated soil material and injected additive material such as form or polymer. When the excavated soil material has less binder and has not enough plastic fluidity or anti-permeability, the additive material is injected to the cutter chamber and mixed into the excavated material, then the plastic fluidity of the material is improved and the material will be easily discharged through screw conveyor. Earth Pressure Balanced (EPB) TBM can be applied to various soil conditions. EPB TBM with ribbon screw conveyor can be used for strata with boulder, cobble and gravel. We have a delivery record of manufacturing with a maximum diameter of 17.45 m TBM.
⌀12.47m Yamatogawa Line Shield Tunnel
Year of delivery / Place of delivery
2011 / Osaka
Construction name
Yamatogawa Line Shield Tunnel
Owner name
Hanshin Expressway Co., Ltd.
Contractor name
Kajima / Tobishima JV
Excavation distance
4,012m
⌀13.6ｍ Tokyo’s Central Circular Expressway – Shinagawa Line Oi area tunnel
Year of delivery / Place of delivery
2010 / Tokyo
Construction name
Tokyo’s Central Circular Expressway – Shinagawa Line Oi area tunnel
Owner name
Tokyo Metropolitan Construction Bureau
Contractor name
Obayashi / Seibu / Keikyu Construction JV
Excavation distance
550m + 345m (U-turn)
Features
URUP method (starting on the ground, reaching to the ground)
⌀17.45m Seattle SR99 road tunnel
Year of delivery / Place of delivery
2013 / USA
Construction name
Seattle SR99 road tunnel project
Owner name
Washington State Department of Transportation
Contractor name
Seattle Tunnel Partners
Excavation distance
2,856m
Features
World largest machine (⌀17,45m), full back-up system, double arm erector (vacuum type), disc cutter exchange system
