Patent ID: 6595724
Filing Date: 2003-07-22
Classification: E21D

Abstract:
A tunnel excavating machine, comprising:a cylindrical excavating machine main portion provided with a cutter head mounted rotatably at a front portion thereof and fit to an external periphery of a covering member through a sealing member; a cylindrical excavating machine auxiliary portion fit to the inside of said excavating machine main portion movably in back and forth directions, the cylindrical excavating machine auxiliary portion having an erector integrally attached thereto for assembling said covering members; a plurality of main propulsion jacks disposed between said excavating machine main portion and said excavating machine auxiliary portion; and a plurality of auxiliary propulsion jacks mounted on said excavating machine auxiliary portion and capable of being retracted with respect to said covering member, wherein assembly of said covering members is enabled under propulsion and excavation with said excavating machine main portion, and, wherein the plurality of said auxiliary propulsion jacks are controlled so that, at the time of extension motion, the plurality of the auxiliary propulsion jacks are controlled as a group, while at the time of retraction, each of the auxiliary propulsion jacks is controlled separately so as to provide successive retraction, at least partially, for sequentially assembling a plurality of covering members.