. The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world. ummarize general practice, it canbe said that this type of span is used forspans from 20 to loo feet, spans under 20 feetbeing either arches or rolled beams, and spansover 100 feet running into riveted girders are frequently built with solidfloors, with the ties bedded in ballast, and thelatest floors of this kind are built of reinforcedconcrete slabs or arches, as the older troughfloors and buckle plate floors have been foundu
. The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world. ummarize general practice, it canbe said that this type of span is used forspans from 20 to loo feet, spans under 20 feetbeing either arches or rolled beams, and spansover 100 feet running into riveted girders are frequently built with solidfloors, with the ties bedded in ballast, and thelatest floors of this kind are built of reinforcedconcrete slabs or arches, as the older troughfloors and buckle plate floors have been foundunsatisfactory, owing to the impossibility ofpreventing rapid deterioration from rust. Plategirder spans over 70 feet long generally rest onpin bearings at each end, to allow for deflec-tion, and have cast-steel end shoes. The usual present practice is to build allspans between 100 feet and 175 feet with riv-eted trusses, and the old style, multiple-inter-section, riveted span has entirely given wayto the riveted, single-intersection truss withlong panels. For deck spans, the old practiceof supporting the ties directly on the upper BRIDGES, z:^^)(Da
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1908
