. The Street railway journal . tional girder These buckets were lifted by means of a traveling singleboom derrick, seated on top of the viaduct, and a hoistingengine. The struts were poured from wheelbarrows fromthe top of the structure through a lo-in. hinged pipe ofgalvanized iron. Concrete for the girders and floor washoisted on wheelbarrows by double cage towers to the topof the viaduct and wheeled to position on runways on theforms. The forms were made of 2-in. lumber, dressed on one side,and as much of the lumber as possible was cleaned andused again after forms were pulled down. The for
. The Street railway journal . tional girder These buckets were lifted by means of a traveling singleboom derrick, seated on top of the viaduct, and a hoistingengine. The struts were poured from wheelbarrows fromthe top of the structure through a lo-in. hinged pipe ofgalvanized iron. Concrete for the girders and floor washoisted on wheelbarrows by double cage towers to the topof the viaduct and wheeled to position on runways on theforms. The forms were made of 2-in. lumber, dressed on one side,and as much of the lumber as possible was cleaned andused again after forms were pulled down. The forms onthe sides of the girders were removed at the end of a week,but those on the columns and the supporting falsework ofthe girders were left in place thirty days longer if thelumber was not needed. The smaller girder forms were supported by falsework,consisting of 4-in. x 4-in. pieces placed 3 ft. on centers alongthe viaduct and resting on planking placed on the ground,which had been leveled to firm bearing. Under the heavier. CROSSING OF SEABOARD AIR LINE RAILWAY AND OAK STREET AFTER THE FORMING WAS REMOVED and new track on the other side. Cored holes are providedto take care of fastening new work to the old when doubletracking is begun. The footings were carried down a uni-form depth of 4 ft., unless extra depth was required to getsuitable foundations. The contractor supplied suitable equipment for two con-crete gangs, consisting of two No. 23^ Smith concretemixers, two hoisting engines, elevators, buckets, etc. Butit was found that while one force was erecting forms theother was putting in concrete, and, therefore, one mixerwas taken away to other work. • After the erection of theforms the columns, up to the bottom of girders, and contigu-ous struts were poured at one continuous operation, so as tomake them monolithic. Next the girders and floor wereput in in the same manner. At first the attempt was madeto pour columns from the top, but owing to the difficulty ofproperly
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
