Canadian engineer . the concrete, and in this wayfree ends are provided for expansion. The lamp standardsare the Luxolabra type with five lamps on each, all lampsbeing 40 watt tungstens. The railing and lamp standardswere all painted a deep green, and the effect is very designing the architectural features of the bridge theaim was to make all lines straight in preference to any February 15, 1912. THE CANADIAN ENGINEER 287 curved lines, and thus reduce the cost of formwork. Also,the idea being- to make all surfaces as sharp and clean cutas possible. The general features of the bridge ov
Canadian engineer . the concrete, and in this wayfree ends are provided for expansion. The lamp standardsare the Luxolabra type with five lamps on each, all lampsbeing 40 watt tungstens. The railing and lamp standardswere all painted a deep green, and the effect is very designing the architectural features of the bridge theaim was to make all lines straight in preference to any February 15, 1912. THE CANADIAN ENGINEER 287 curved lines, and thus reduce the cost of formwork. Also,the idea being- to make all surfaces as sharp and clean cutas possible. The general features of the bridge over the penstockare similar to those of the longer bridge, the span beingtwenty-six feet in width. On the cross section of the bridgesubmitted herewith the details of the beams and slabs arefully shown. After the embankment connecting the twobridges has fully settled to a solid condition, it is the inten-tion to connect the curbs, sidewalks, and railings on eachbridge, and to finish the roadway in a permanent Cumberland Street Bridges; View of Form Work in Place. The rails for the street cars were bedded and surroundedwith concrete, being held together with tie rods at intervalsof four feet. So far, and under traffic conditions, thishas proved satisfactory, there being no signs of chipping orcracking of the concrete; in fact, this can be said of theentire work. Design.—In figuring for the design of the bridges, thecalculations were based on the following data:— Live load, a thirty-ton street car, and an additional liveload of one hundred pounds per square foot, with an amountfor impact figured at fifty per cent, of the live load. Ratio of modulus of elasticity of steel to that of con-crete, 15. Allowable working stress of steel in tension, 16,000pounds per square inch. Society of Civil Engineers. The sand used was ordinarybank sand, sharp and coarse grained, with a very smallpercentage of loam. The broken stone called for in thespecifications was crushed trap rock,
Size: 2290px × 1091px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
