File:American engineer and railroad journal (1893) (14758949912).jpg

Identifier: americanengineer71newy (find matches)
Title: American engineer and railroad journal
Year: 1893 (1890s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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Text Appearing Before Image:
stringer sus-penders up to the top of the posts of the main trusses by means ofdiagonal suspender angles. Resting on top of the floor beams are two lines of channel ironsparallel to the main trusses. These channel irons form stringersfor the foot walk, which extends the full length of the crane. Thefloor beams also carry the pillow-blocks for the main shafting. Atthe ends of the crane, and in the plane of the trusses, are carrieddown riveted legs, or supports of the box form. These legs arefirmly braced to the bottom chords of the main trusses, with largeplate iron brackets, well stiffened with angle iron flanges. Thelegs are also braced to each other crosswise of the crane, with asystem of horizontal and diagonal braces, with a stiff tie-beam atthe foot of the legs. The width from center to center of the trucks supporting thecrane is 43 feet 9% inches, forming a wheel base for the crane of alittle more than one-fifth of the span, which is sufficient to squarethe crane on the tracks.
Text Appearing After Image:
Trolley for 200-foot Gantry Crane. The top chords are made of two channel irons with a cover plateon top, and latticing on the bottom. The bottom chords are madeof two channel irons, latticed on top aud bottom, so as to afford noroom for lodgment of moisture; this point being carefully kept inview throughout the construction. The vertical posts of the trusses each consist of four angle ironslatticed togethei. The diagonal members of the trusses are eachformed of two angle irons riveted at their intersection. The loads and strains adopted for this crane were as follows: Alive load for trolley equal to 20,000 pounds. To this was added, forimpact, 25 per cent., or 5,000 pounds. The weight of the trolley wasestimated at 23,00u pounds, making a total of 48,000 pounds dis-tributed on four wheels, spaced about 9 feet centers, bringing a re-action upon each stringer support of 18,000 pounds. To still further provide for any sudden application of a live load,it was assumed to be equal to 22.00

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