. Concrete bridges and culverts, for both railroads and highways . andcarries 10 cross walls which support the floorsystem. There are also five semicircular approacharches \vith clear spans of 53 feet. The bridge con-nects Germantown and Roxborough, two residentialsuburbs of Philadelphia. It has a 40-foot roadway,and two 10-foot sidewalks. The entire structure issolid concrete, not reinforced, excepting in certainminor details. The surface finish is rough, some-what similar to pebble dash, but of coarser exposed surface shows stone clips of not overthree-eighths inch in size, formed
. Concrete bridges and culverts, for both railroads and highways . andcarries 10 cross walls which support the floorsystem. There are also five semicircular approacharches \vith clear spans of 53 feet. The bridge con-nects Germantown and Roxborough, two residentialsuburbs of Philadelphia. It has a 40-foot roadway,and two 10-foot sidewalks. The entire structure issolid concrete, not reinforced, excepting in certainminor details. The surface finish is rough, some-what similar to pebble dash, but of coarser exposed surface shows stone clips of not overthree-eighths inch in size, formed by washing beforethe cement had hardened. The total length ofbridge over all is 585 feet, and the cost $259, S. AVebster, Chief Engineer, Bureau of II. H. Quimby, Bridge Engineer. Reilly &Riddle, Contractors. Connecticut Avenue Bridge, Washington. Connecticut Avenue, one of the chief thorough-fares of Washington, is carried over Rock Creekvalley near its junction witli the Potomac on a newconcrete arch bridge, about three miles from the. 88 CONCRETE BRIDGES AND CULJ-ERTS. Capitol building. The roadway is 120 feet abovethe valley below, and is carried by five semicircu-lar arches of 150-foot span, and two end arches of82-foot span. It has a 35-foot roadway, and twosidewalks 8 feet wide each, making a total width of52 feet, a clear length between abutments of 1,068feet, and a total length of 1,341 feet. It was com-menced in 1889, and completed in 1908. The mainarches are hingeless with no reinforcing, but thespandrel arches have steel reinforcement. As thebridge is located in a fine residential district, itsaesthetic appearance was a matter of considerableimportance. The face rings of the arch, pier cor-ners, mouldings and all trimmings below the granitecoping, are moulded concrete blocks. The remainingpari of the exposed concrete surface is bush ham-mered, for the purpose of presenting a more uniformand pleasing appearance. The cost of the falseworkwas about
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