Public works . :>eCTIONAA TYPICAL, DESIGNS FOR MAIN AND INTERMEDIATE RIVER PIERS FOR ARCH SPANS May 211 1922 PUBLIC WORKS. constructed with a width of 60 feet, which may beeventually increased. Except for a short grade of little less than fourper cent., the maximum grade is 3^4 per cent., whichobtains over only a comparatively small part of thestructure, the profile being a flat curve and level overthe channel span. RIVER PIERS AND ABUTMENTS. The seven arch spans are supported on two abut-ments and si-x intermediate piers, all having woodfoundation piles with their tops embedded in con-cret
Public works . :>eCTIONAA TYPICAL, DESIGNS FOR MAIN AND INTERMEDIATE RIVER PIERS FOR ARCH SPANS May 211 1922 PUBLIC WORKS. constructed with a width of 60 feet, which may beeventually increased. Except for a short grade of little less than fourper cent., the maximum grade is 3^4 per cent., whichobtains over only a comparatively small part of thestructure, the profile being a flat curve and level overthe channel span. RIVER PIERS AND ABUTMENTS. The seven arch spans are supported on two abut-ments and si-x intermediate piers, all having woodfoundation piles with their tops embedded in con-crete footings carried down to different levels fromelevation 42 for pier 6 to 50 for pier 1, and to eleva-tion 52 for both abutments. The 10,500 pine foundation piles are from 20to 40 feet in length, are spaced about two feet aparton centers and carry maximum construction loadsof nearly 16 tons. The bottom of the concrete inthe piers was required to be at least 18 inches belowto tops of the piles. Piers 4 and 5 under the channel span are ofspecial construction With a greater width than theother piers so as to provide indep
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
