Introduction : Extruded Concrete Lining Method

• Introduction
• Brochure(PDF)
• Paper
• Video

Characteristics

1. Construction of high-quality linings
   Denser concrete with greater strength enables the construction of high-quality concrete linings.
2. Linings with a broad range of applications
   This method enables rational construction of concrete linings according to the site condition such as reinforced concrete, nonreinforced concrete, fiber-reinforced concrete, steel-reinforced concrete and prestressed concrete linings.
3. Superiority of working conditions in tunnel
   This method can be applied to mountainous tunneling, and as working conditions in the tunnel is superior compared to the conventional tunneling method, cost for ventilation facilities can be minimized.
4. Minimization of ground settlement
5. Saving of construction time and cost
   The type of lining can be selected according to the geological condition, and secondary lining can be eliminated depending on the use of the tunnel. Construction cost therefore can be reduced and construction period can be shortened.

Mechanism of tunnel driving

Construction flows by lining reinforcement method

1. When reinforced concrete is used
   (cyclic concrete placement)
2. When nonreinforced concrete is used
   (continuous concrete placement)

Applications to actual tunneling