Supplement to Selections of China Mainland Magazines, 第 45-50 期American Consulate General, 1973 |
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第 1 到 3 筆結果,共 9 筆
第 9 頁
... Excavating and Construction The construction of a tunnel begins with excavation of earth or rock .. Excavating methods vary with the character of the material to be removed . Rock tunnels require blasting . If the rock is structurally ...
... Excavating and Construction The construction of a tunnel begins with excavation of earth or rock .. Excavating methods vary with the character of the material to be removed . Rock tunnels require blasting . If the rock is structurally ...
第 9 頁
... Excavating and Construction The construction of a tunnel begins with excavation of earth or rock . Excavating methods vary with the character of the material to be removed . Rock tunnels require blasting . If the rock is structurally ...
... Excavating and Construction The construction of a tunnel begins with excavation of earth or rock . Excavating methods vary with the character of the material to be removed . Rock tunnels require blasting . If the rock is structurally ...
第 11 頁
In all but the hardest rock formations , tunnels must be timbered as the excavation proceeds . Timbering is necessary to prevent rock from falling during blasting and to support masses of granite weakened by the excavation . Since ...
In all but the hardest rock formations , tunnels must be timbered as the excavation proceeds . Timbering is necessary to prevent rock from falling during blasting and to support masses of granite weakened by the excavation . Since ...
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