A spiral chute assembly for blind shafts in underground mining works, preferably for intermediate bunkers

摘要

A spiral chute assembly for blind shafts 1 in underground mining works, preferably for intermediate bunkers, comprises a spiral chute fixed to the inner wall of a casing, or formed in the wall of the shaft and defining an inner space, which can itself be used as an intermediate bunker, within the eye of the spiral. An access and air tunnel 10, which has parallel vertical side walls, is formed under the spiral chute using the chute as a roof and inspection apertures are provided in one of the two side walls or the floor of the tunnel. The area surrounding the casing 12 can be used for storing material, which reaches this area via holes in the casing (Figure 2, not shown), and a further spiral chute may be employed in this outer area (Figure 3, not shown). IMAGE