Construction of Walensee railroad tunnel in Switzerland was complicated by simultaneously built parallel vehicular tunnel; close crossing of tunnels necessitated cautious blasting; fractioned and dusty rock formations in railroad tunnel required timbering; successful grouting with thick honeylike solution of bitumen; tunneling was advanced by making first or pioneer tunnel.
Tunneling for swiss railroad relocation
World Construction
World Construction ; 13 , n 3
1960
3 pages
Aufsatz (Zeitschrift)
Englisch
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