NATM TUNNEL STRUCTURE AND CONSTRUCTION METHOD THEREOF

摘要

The present invention provides an NATM tunnel construction structure having an invert reinforcement structure, and a construction method thereof. According to the present invention, it is possible to secure a reinforcement structure for steel ribs through support fixtures and support struts; is possible to shorten a required construction time; and is possible to secure stability and safety of the overall structure by suppressing a crown settlement and a convergence displacement. The NATM tunnel construction structure comprises: steel ribs which are separately installed along a longitudinal direction of an excavated tunnel face; supports struts connected across in a transverse direction at a predetermined height from both ends of the steel ribs; supports members which have one end fixated to each of the end portions of the support struts and an other end fixated to the steel ribs; and a plug member laid to the support struts.