The function of support arch in tunnel construction: support tunnel body, it and anchor, steel mesh, connecting reinforcement, concrete and so on to form a rigid body to prevent its collapse. After construction can not be taken down for reuse, is permanent support in the tunnel.
1. The overall stiffness of the support arch is relatively large, which can provide relatively large early support strength; Section steel arch can bear load earlier than grille steel frame.
2. The support arch can be well combined with anchor rod, steel mesh and shotcrete to form joint support, which can enhance the effectiveness of support and better stress conditions. Especially the combination of grille steel frame is best.
3. Grille steel frame is processed on site, with low technical difficulty and requirements; Good adaptability to change of tunnel section.
4. Easy installation and erection of support arch.
