FIELD: mining.
SUBSTANCE: several blast holes are drilled over tunnel contour. Then, several blast holes are drilled by diamond drilling at preset points inside said contour. Blast holes are connected by zones cut by diamond discs at fastening the cutting machine in blast holes. Separate blocks are produced to be destructed by wedge jacks. Lower and upper parts of blocks formed between said zones are cut off by diamond cable in the following order: diamond cable is fitted on rotary tool and rollers to be secured inside predrilled blast holes. Note here that said rotary tool is secured opposite said rollers. Then, said rotary tool is activated to make diamond cable move for cutting of blocks.
EFFECT: lower tunnelling costs, higher efficiency and safety.
7 dwg
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