Public works . which are knocked down and removedafter the concrete has set sufficiently. At the 90-degree curves the outer faces of the sewer wereconcreted against the steel sheeting driven there toretain the sides of the trench. On the tangents a progress of about 20 feet a dayis averaged at each of the two points where work isin progress. Protecting Concrete Bridge Girders fromLocomotive Blasts The Clarendon Street bridge in the city of Bostonis a short, wide structure, carrying the street oblique-ly over the lines of seven tracks of the Boston andAlbany and Xew York. New Haven & Hartfordra
Public works . which are knocked down and removedafter the concrete has set sufficiently. At the 90-degree curves the outer faces of the sewer wereconcreted against the steel sheeting driven there toretain the sides of the trench. On the tangents a progress of about 20 feet a dayis averaged at each of the two points where work isin progress. Protecting Concrete Bridge Girders fromLocomotive Blasts The Clarendon Street bridge in the city of Bostonis a short, wide structure, carrying the street oblique-ly over the lines of seven tracks of the Boston andAlbany and Xew York. New Haven & Hartfordrailroads. The bridge has a granite block pavementlaid on a reinforced concrete floor slab supported onBetlilehem H-beams and riveted girders, completelyencased in a protecting mass of concrete. The con-crete enclosing the bottom figures of the girders iscontinuous from girder to girder, thus enclosing thespaces between the girders and providing a flat ceiledsurface underneath them, and onlv a short distan e. above the tops of the stacks of the locomotives thatpass beneath the bridge. in order to prevent the injury of the concrete bythe high-pressure locomotive blasts containing sul-phur and other injurious elements, the surface of theconcrete is protected by cast iron plates, 30 inches by49 inches and 1-inch thick, provided on adjacentedges with ship lap joints 2>2 inches wide with1^2 inch normal overlap, thus making a continuousflush surface and allowing for expansions or irregu-larities in construction. The cast iron plates are provided on the upperside with pairs of lugs 3 inches high, cored for5^-inch bolts that in some places engage lugs attacheddirectly to the lower flanges of the plate girders. Inother cases the holes receive long ^-inch continu-ous rods that can be supported at irregular intermed-iate points by hook bolts passing through slottedholes in 3 x 3^-inch transverse bars supported attheir ends on the bottom flanges of the steel beamsand girders. The lugs, ro
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
