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Korea companies develop innovative NATM support structure

    Ji-Yu Doko
    By Ji-Yu Doko Replies (2)
     
    Kolon Global, Steeltech and Donghae General Technology Corporation develop a quadrilateral grid support using deformed bars.
     
    The quadrilateral lattice support is a steel support material to secure the stability of the tunnel in NATM tunnel excavation work: It is made of steel to minimize the relaxation of the ground around the tunnel immediately after excavation and to suppress excessive initial displacement of the excavation surface.
     

    The new technology is thread-deformed bar, thread-deformed bar: a deformed bar with longitudinal ribs removed (reinforcing bar with protrusions attached to the surface) and the cross section is formed in a quadrilateral shape to reduce the use of steel by up to 21% and bend. It has a better performance compared to other grid support products. In new product also steel used is reduced, the cost is reduced by up to 23% and the weight is also reduced, making it easy to transport and install.

     

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