Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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Downloaded From : www.EasyEngineering.netForms for Concrete Bridge Decks 439Job builtguardrailBarrier reinforcing steelInside barrier to be erected andconcrete placed at a later dateBracing2nd pour45 degreeend section90 degree end sectionwith interlock1st pourBolt holderExterior sideBridgeoverhangbracketB-14-A 1/2” diameter adjustablecoil bolt with free running nut or castwing nut. Good construction practicesdictate the use of a 1/2” cut washer betweenthe bolt holder and nut when afree running nut is used. Exterior beamInterior sideFIGURE 16-5 Overhang formwork for a bridge slab. (Source: Dayton SuperiorCorporation)ww.EasyEngineering.nshallow steel beam. Formwork for a short overhang is illustrated inFigure 16-6(b) for a shallow steel beam and in Figure 16-6(c) for ashallow concrete beam.Deck Forms Supported by Steel JoistsIf bridge piers are close enough together, and if there is enough reuseto justify the initial cost, open-web steel joists may be used to supportthe forms for a concrete deck, as illustrated in Figure 16-7. At the timea concrete cap is cast, anchors should be set for bolts to support steelangles. The ends of the joists are supported by these angles. If necessary,internal steel-plate fillets may be welded across the legs of theangle to provide increased stiffness. Nailer planks should be attachedto the tops of the joists. Variable-depth wood joists may be used toprovide camber or to provide for variations in the thickness of theconcrete slab between piers.Downloaded From : www.EasyEngineering.net
440 Chapter SixteenDownloaded From : www.EasyEngineering.netC-60 type 4-APres-Steel hangerJoistsSide formD-1-L-boltB-11 washerB-13 coilnutBraceKickerLedgersStringerShore (braced for stability)WedgesNeedle beamsA-19 corner washerB-13 coil nut(a) Wide overhang on a shallow beamB-12 coil rodSide formJoistsJoistsC-60Pres-SteelhangerStringerShore (bracedfor stability)Wedgesww.EasyEngineering.nLedgersNeedle beamsB-11 washer B-14 coilnut(b) Short overhang on a shallow steel beamB-14-Aadjustablecoil boltJoistsDoubleledgersC-60Pres-SteelhangerLedgerStringerShore (bracedfor stability)WedgesB-11washerB-14 coil boltB-11 washerSupportledgersNeedle beamsB-11 washerB-13 coilnut(c) Short overhang on a shallow concrete beamB-14-Aadjustablecoil boltFIGURE 16-6 Methods of overhang formwork for bridge slabs. (Source: DaytonSuperior Corporation)Downloaded From : www.EasyEngineering.net
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120 Chapter FiveExample 5-12Class I
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Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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