. American engineer and railroad journal . UJ a oo X <111 0. < H(0 ■< < z >-w zz a zO XCO bl > I-O ccwa. I O AND RAILROAD JOURNAL. 97. I■<» ^ UJ zz HO z-< m 3CO z_l>- CO zzllJQ. CO zo HOiijCO a z< o cr z< o 98 AMERICAN ENGINEER, CAR BUILDER carried over the subway at Twenty-seventh, Twenty-eighth and Twenty-ninth streets. In Figs. 2, 3 and 4 are given sections that are each typical ofthe masonry work. The tunnel section we have already alludedto; the dimensions of the retaining walls are given in Fig. 4; ifat any point it is of greater height than shown
. American engineer and railroad journal . UJ a oo X <111 0. < H(0 ■< < z >-w zz a zO XCO bl > I-O ccwa. I O AND RAILROAD JOURNAL. 97. I■<» ^ UJ zz HO z-< m 3CO z_l>- CO zzllJQ. CO zo HOiijCO a z< o cr z< o 98 AMERICAN ENGINEER, CAR BUILDER carried over the subway at Twenty-seventh, Twenty-eighth and Twenty-ninth streets. In Figs. 2, 3 and 4 are given sections that are each typical ofthe masonry work. The tunnel section we have already alludedto; the dimensions of the retaining walls are given in Fig. 4; ifat any point it is of greater height than shown the wall is carrieddown with steps of 18 inches every 4 feet as shown. The sectionof a bridge abutment is likewise typical. The section showingthe relation between the retaining wall and the foundation ofadjacent buildings that must be under-pinned during construc-tion is only one selection from many cases. In some instancesthe entire front of buildings must be removed and rebuilt. Theretaining walls are to be built in an open trench, and are to be ofrubble masonry laid in Portland cement (1 part cement to 3 partssand), with a coping
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
