Apparatus and a method for constructing an underground curvilinear and narrow structure in a ground that includes boulders

摘要

An excavating member of a constructing means inserts downwardly from a chassis into the ground with an activating means of the chassis and a drive means of the constructing means located within an excavated section and connected to the excavating member and a supporting frame of the constructing means for forcing portions of the member laterally against the facial wall of the section being advanced relative to the frame in a direction opposite of an advancing direction diverged from the axis of the section to excavate the ground adjacent to the member ahead of the frame toward the advancing direction. The section is in this way formed in the diverged advancing direction. The member can be mounted for lateral movement about an axis perpendicular to the advancing direction and within the central surface of the constructing means. A set of “n” side wall-supporting members can be connected to the frame for relative movement about an axis of turning advancement of the section. The supporting members can be advanced individually or in groups by means of an activating means coupled between the frame and the members, at the speed (0.5n−1)×V, and shifted backward with the speed V equal to the speed of continuous movement of the frame with the activating means of the chassis. The supporting members have the ability to be expanded and outwardly forced into compressive engagement with the walls being supported by the members to immobilize the member relative to the walls.