Engineering and Contracting . d in the tops of the will be noted that some of the piles areplaced at an inclination to resist the longi-tudinal and lateral thrust. Two arched open-ings were left in the pier shafts to reduce theamount of concrete required. The footingsof the piers, which are 10x25 ft. in plan and6 ft. high, were built of 1:2 ;4 concrete, towhich was added 20 per cent of cement tocompensate for loss caused by depositing theconcrete under water. The pedestals and piershafts were constructed of 1:2% :5 concrete. Piers Nos. 143 and 145, which are ad-jacent to the center pi
Engineering and Contracting . d in the tops of the will be noted that some of the piles areplaced at an inclination to resist the longi-tudinal and lateral thrust. Two arched open-ings were left in the pier shafts to reduce theamount of concrete required. The footingsof the piers, which are 10x25 ft. in plan and6 ft. high, were built of 1:2 ;4 concrete, towhich was added 20 per cent of cement tocompensate for loss caused by depositing theconcrete under water. The pedestals and piershafts were constructed of 1:2% :5 concrete. Piers Nos. 143 and 145, which are ad-jacent to the center pier of the lift span, arein form similar to the typical piers shown inFig. 5. In these piers, however, the diagonalreinforcement near the openings is omitted,and the general dimensions are dimensions of the footings are 13 ft. 5ins. x 42 ft. 10 ins. x 6 ft. high, and the totalheight of the piers is 26 ft. The overall di-mensions of the top of the piers are 4x36 , allowing for the 4-in. wash, are 3 ft. 4 Fig. 4. Elevation of Lift and Adjacent Fixed Spans Showing Type of Construction andMethod of Operation—Gunpowder River Bridge. -2S-4 • i-sz i-Si r--5-6-^ r-50?- ?Si ,. I-si _ /-J^- ^_1_ «i p-5-0?-| r5-0?--Tj p5-6--»i •?5-6--1 r- Holes 2? dO 8 Deep for Dowels?^, ?« -£.->Sq7^ ZyloLg ? Rotter $I Ft
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
