Improvements in frontal sliding devices for the construction of underground hollow spaces (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in frontal advance devices by shield for the construction of underground hollow spaces, such as tunnels, galleries and similar, with a shield formed by a number of guided blades parallel to each other, and the presses that advance the blades, being supported and guided the blades in support frames that move following the direction of advance, characterized in that each of both support frames forward in re-tightening step have two supporting supports carrying the blades and supported by supporting struts, which are joined with the blades on a guide that assures them by way against lifting, and whose struts are supported on hearth beams or similar. (Machine-translation by Google Translate, not legally binding)