Ingegneria e Contracting . egli il perno di articolazione per la metà settentrionale dell'spanwas supportato da un doppio piegato di 12 cypress pile, cappedand controventato. Le torri erano 12x12 travi, montato withordinary legname derrick mast scarpe e sono state controventato con3XL0s e 6x8s. Le foglie del ponte consisteva di 47-ft. legnami,portando i legami e le rotaie per la costruzione ferrovia, andbraced lateralmente con 3xl0s imbullonata al lato di sotto della 369 il design di acciaio pile. Il design dello stack in molti casi è stata effettuata da acut e provare il metodo che potrebbe o non potrebbe involvemany prove prima di una soluzione è stata raggiungere

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Engineering and Contracting . he trunnion for the north half of the spanwas supported by a double bent of 12 cypress piles, cappedand braced. The towers were 12x12 timbers, fitted withordinary timber derrick mast shoes, and were braced with3xl0s and 6x8s. The leaves of the bridge consisted of 47-ft. timbers, carrying ties and rails for the construction railway, andbraced laterally with 3xl0s bolted to the under side of the 369 THE DESIGN OF STEEL STACKS. Stack design in many cases has been carried out by acut and try method which might or might not involvemany trials before a solution was reached. In the Journalof Engineering of The University of Colorado, Mr. W. A.Hitchcock, Instructor in Engineering Mathematics, pre-sents methods for obviating this difficulty and lead-ing to direct results. In his article, which is reprintedbelow, practically in full, Mr. Hitchcock gives some newformulae and new diagrams: The design of the steel stack will be considered undersix subdivisions, viz.: (1) Working stresses; (2) Mini-. Temporary Bascule Bridge. 12x128. The .supporting cables comprised two strands of?s-in. steel wire. The bridge was designed to carry a live load of 5, 000 lb.at the center of the span. This was assumed to be theweight of one yard of concrete, with bucket and car. Theconcrete was transported by two cars, running on paralleltracks, A i^-in. cable hauled the cars by means of a two-drum hoisting engine. The haulage was from the mixingplant to the derrick on a pier of the new bridge. When the ice broke up in the river the north half ofthe bascule bridge was swept away. The caisson for thepier at this location was not damaged, and the remainderof the concrete could be placed from a mixing plant lo-cated on the south bank of the river. COST OF COATING COAL BUNKERS WITH ACEMENT GUN. The steel coal bunkers in connection with the boilersof the Roseland water works pumping station of Chicago, 111., after about 4 years became badly pitted on the innersurface from the e

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• bookpublisherchicago
• bookyear19