Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
New roof shield used for driving railroad tunnel in soft earth
Two semi-cylindrical steel shells were advanced in the Point Defiance R. R. tunnel by hydraulic jacks braced against the timbering. (1500 w.) (No. 59069)
New roof shield used for driving railroad tunnel in soft earth
Two semi-cylindrical steel shells were advanced in the Point Defiance R. R. tunnel by hydraulic jacks braced against the timbering. (1500 w.) (No. 59069)
New roof shield used for driving railroad tunnel in soft earth
Eng Rec
1915
Ills.
Aufsatz (Zeitschrift)
Englisch
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Railroad tunnel roof rebuilt from shaft
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