Methods	Outline	Leaflet
PC Contra Bridge	PC Contra Bridge is a single span inverse-trapezoid PC frame structure with integrated upper and lower sections. It provides higher quality and shortens the construction period compared with conventional cast-in-place method because almost all structural members are precast elements.	(JAPANESE)
Precast ventilation tower	Underground tunnels need air ventilation system such as Precast ventilation building or tower. Because a ventilation tower can be a landmark of area, materials and finishing that match with the surrounding is possible in the design.	(JAPANESE)

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