Construction of underground tunnels and rock chambers

Details Construction of underground tunnels and rock chambers Construction of underground tunnels and rock chambers

1975-11-13

1977-10-11

Taylor, Dennis L.

Mining or in situ disintegration of hard material

Processes

Forming blocks

61 63, 299 11, E21D 2000

Patent

active

040528600

ABSTRACT:
Reinforcing the rock walls of a cavity comprises drilling long holes into the rock at predetermined distances and grouping and to a predetermined depth, inserting a bar-shaped tension member of high tensile strength into each of these holes and fixing their end of each member in the inner end of the respective hole. The tension members are subsequently elongated by biasing their outer ends against the cavity surface by known tension means such as screw nuts or wedges, thereby compressing the rock and preventing cracks from developing. In order to convert such cavities into tight containers, an impervious pliable sheet material is laid close to the cavity wall and held there by fastening it to the protruding ends of the tension members.

REFERENCES:
patent: 3695045 (1972-10-01), Williams
patent: 3877235 (1975-04-01), Hill
patent: 3893303 (1975-07-01), Rotter
patent: 3940941 (1976-02-01), Libert et al.

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