Chicago : Engineering and Contracting Pub. Co. · leaf 334
t of thefoundation piers of the Union Depot Co.sviaduct, which carries three tracks, crossingthe line of the tunnel just west of Sta. 156.These drifts were carried east from Shaft No. air on any part of the work in Detroit, buthad decidedto complete the section of tunnelfrom Shaft No. 1 to the… … SECTION AT B-B SECTION AT C-C Fig. 3—Side Shield Used in Approach Tunnels. I, the top, middle, and bottom center drifts toprovide for the building of the full section ofthe center wall. Figure 2 also shows a gen-sral cross-section of these drifts, the methodDf timbering, and a cross-section of the…
Buildings
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