Improvements in sustainable frameworks for mining galleries (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in support frames for galleries of mines formed by at least two elements that present, after assembling, the shape of a complete or truncated warhead, characterized by the fact that at least one of the branches (B1, B3P5) in shape of arcs of circumference of radius of curvature substantially equal to that of the other branch (B2, B4, P6) is mounted in a sliding arrangement in relation to the latter. (Machine-translation by Google Translate, not legally binding)