Engineering and Contracting . b) East Outline Drawing of Des Moines River Viaduct Showing General Dimensions and Methods Used in Erection. forms (extending 2 ft. below the top of thepedestals) were provided around each anchorbolt. The holes so formed were grouted afterplacing the bed plates. In addition, each bedplate was fastened to the masonry with eight2-in. diameter fox bolts, each 2 ft., 6 ins. long,the holes for which were drilled after erectingthe bed plates and columns. To provide forany lateral motion which may accompany thesettlement of the fill, the pedestals in bents t5-i&g
Engineering and Contracting . b) East Outline Drawing of Des Moines River Viaduct Showing General Dimensions and Methods Used in Erection. forms (extending 2 ft. below the top of thepedestals) were provided around each anchorbolt. The holes so formed were grouted afterplacing the bed plates. In addition, each bedplate was fastened to the masonry with eight2-in. diameter fox bolts, each 2 ft., 6 ins. long,the holes for which were drilled after erectingthe bed plates and columns. To provide forany lateral motion which may accompany thesettlement of the fill, the pedestals in bents t5-i>ii forced concrete slab with a timber are provided for a permanent concretebackwall which will be constructed when theembankment has thoroughly settled. The concrete is a 1:3/^ :5 mix for the foot-ings, and 1:3 AH mix for the neatwork. .Anexcellent grade of sand was found about 4mile cast of the viaduct. The sand containedabout 20 per cent of gravel and was used forthis work. The location of this gravel pit is. concrete in the pedestals and abutments is11,?.)0 cu. yds. The concrete in the abutments and pedestalssituated on the slopes at the east and westends of the viaduct was mixed at the foot ofthe slopes, and was hoisted in concrete cars tothe pedestals and abutments by means of aninclined track. The concrete in the pedestalslocated on the flat portion of the valley wasplaced with a stiff-leg derrick. The work connected with the layout of theviaduct was done by means of repeated hori-zontal measurements with a 100-ft. steel tun-nel tape. A spring balance was used, and the fmenf of 3ia/<s. El&vation Front £.- n (a) yyest /ibofmentFig. 3. Elevations of West Abutment and Typical Downstream
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
