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Single tunnel crew shuttles between two headings
Construction techniques in which one crew per shift is alternating between headings in novel tunneling sequence used at Allegheny Mountain east of Pittsburgh; mountain consists of hard shale with interspersed layers of very hard gray sandstone, inclined up to 20°; tunnel is driven to horse-shoe cross-section, 27 ft 3 in. by 33 ft 4 in. pay line dimensions; steel support ribs are set as headings advance; drilling at both headings is done with specially designed drill units.
Single tunnel crew shuttles between two headings
Construction techniques in which one crew per shift is alternating between headings in novel tunneling sequence used at Allegheny Mountain east of Pittsburgh; mountain consists of hard shale with interspersed layers of very hard gray sandstone, inclined up to 20°; tunnel is driven to horse-shoe cross-section, 27 ft 3 in. by 33 ft 4 in. pay line dimensions; steel support ribs are set as headings advance; drilling at both headings is done with specially designed drill units.
Single tunnel crew shuttles between two headings
Roads Streets
Roads and Streets ; 106
1963
2 pages
Article (Journal)
English
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