TUNNEL EXCAVATING DEVICE

PURPOSE: To contrive the construction of a small-sized and light weight rack by dividing a self-traveling rack into an upper stage and a lower stage and constituting the rack so that both may be connectable and loading a main excavating machine on the lower stage and a post treatment machine and so forth on the upper stage and forming the lower stage under solid structure and the upper stage under soft structure. CONSTITUTION: A lower stage gantry 10 comprising a rack 18 traveling on a rail 17 is designed to be solid enough to withstand stress or vibration produced during excavation in structure on which an outrigger 26 and so forth required for excavation are loaded. On one hand, an upper stage gantry 12 comprising a traveling rack 30 is designed to be relatively light in structure. Main equipment required for post work treatment, such as a man cage 13, which serves as an erector, a spray robot 14, an excavating machine 14 and a support crane are loaded on the upper stage. The lower stage gantry 10 and the upper stage gentry 12 are separatively connected with a connection rod (equivalent to a train connector). This construction makes it possible to shorten the length of each gantry and reduce the total weight of the whole equipment dramatically.