Canadian engineer . tlong, running transversely. Each shoe is anchored with fourlU-in. bolts running 11 ft. o in. into the masonry and thebuilt girders, grillages and anchors were all set in placewhile the concrete was being built, the tops of the girdersbeing flush with the top of the pier. The counterweight frame is of the dimensions and ma-terial noted on Plate No. 4. The joints at the counter-weight trunnion and the first link pin were well reinforcedwith plates to take the bearing of the pins and the maingusset plates were extended beyond the sides of the mainmembers, the outer edges bein
Canadian engineer . tlong, running transversely. Each shoe is anchored with fourlU-in. bolts running 11 ft. o in. into the masonry and thebuilt girders, grillages and anchors were all set in placewhile the concrete was being built, the tops of the girdersbeing flush with the top of the pier. The counterweight frame is of the dimensions and ma-terial noted on Plate No. 4. The joints at the counter-weight trunnion and the first link pin were well reinforcedwith plates to take the bearing of the pins and the maingusset plates were extended beyond the sides of the mainmembers, the outer edges being reinforced by stiffenerangles curved to conform to the outline of the plate. (SeePlate No. 3.) This was also done on the main trunnionshoes and on the moving leaf at the second link pin. Theweight and position of the concrete in the counterweightwas finally carefully calculated from the shipping weightsof the various members composing the counterweight ffameand the moving leaf. The concrete is composed of one part. Fig. 3.—Looking from Counterweight Tower Towards Mov-ing Leaf. Showing Erection Traveller About to RaiseCounterweight Trunnions to Place. cement, three parts sand, and five parts gravel, and wasfound by trial to weigh 141 lbs. per cubic foot when large pockets were left which, after the concrete wasdry, could be either totally or partially filled with concreteadjusting blocks weighing from 350 to 700 pounds finally calculated, the total weight of concrete necessarywas 1,756,000 pounds, so the dimensions were arranged toprovide for 1,656,000 pounds and the pockets, if filled,would give 200,000 pounds extra. Thus the bridge wouldbalance with the pockets about half full. Tests on thebridge since completion prove the assumptions to havebeen substantially correct. The main trunnions are turned pins i6j^ inches are supported on built shoes and are keyed to caststeel collars which are fastened to the shoes with turnedbolts. The thrust from the
Size: 1918px × 1303px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
