Support for mine gallery, tunnel etc.

摘要

The roof of a mine gallery, etc. is supported by a sheet steel plate (2) positioned at a distance from the rock surface (1). The gap (7) between the sheet steel plate and the rock face (1) is filled with concrete which is reinforced by wires, or wire mats (4). A second sheet steel plate (5) is installed in the gap (7) between the first plate and the rock face and is attached to the first sheet steel plate by the wires, or wire mats..