A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Excavating for subways presents problems differing from ordinary mine drifting. Two methods, one involving use of metallic roof shield and other depending upon timbering for needed support and protection, are described.
Excavating for subways presents problems differing from ordinary mine drifting. Two methods, one involving use of metallic roof shield and other depending upon timbering for needed support and protection, are described.
Tunneling through soft ground
Eng. Min. Jl
Jones, Robert W. (author)
1921
2 pages
4 Figs.
Article (Journal)
English
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