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

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ww.EasyEngineering.nDownloaded From : www.EasyEngineering.netFlying Deck Forms 455The sequence of operations for removing and relocating flyingdeck forms is shown in Figure 17-5. Tilting form guides are placedunder the trusses to assist in removing the forms. The decks are flownonto dollies, which may be used to move forms across a slab for finalmanual positioning.FIGURE 17-5 Sequence of operations for removing and relocating fl ying deck forms.(Source: Form-Eze Systems, Inc.)Downloaded From : www.EasyEngineering.net
456 Chapter SeventeenDownloaded From : www.EasyEngineering.netFolding jack20,000-lb capacityShoring heights:6' 2" to 12' 6" standardWith extensions,shoring heightsup to 16' plusAdjustable jack40,000 lbcapacity(a) Folding jack(b) Adjustable jackFIGURE 17-6 Representative flying form trusses with cribbing jacks supportingthe trusses. (Source: Form-Eze Systems, Inc.)ww.EasyEngineering.nAs illustrated in Figure 17-6, the lower chord of a truss is supportedat panel points by adjustable screw jacks, which rest on theconcrete floor slab. The folding jack legs in Figure 17-6(a) may berotated upward to a horizontal position to facilitate the moving offorms. Folding jacks have a 20,000-lb load capacity for standard shoringheights from 6 ft 2 in. to 12 ft 6 in. The adjustable jack in Figure17-6(b) is available with a 40,000-lb load capacity and with extensionsfor shoring heights of up to 16 ft. The concrete floor slab under thejacks should be supported by reshores, which are located directlybelow the jacks that support the trusses.Versatility of FormsIt is possible to assemble form units suitable for use in casting almostany concrete slab configuration by combining modules, components,and accessories. Figures 17-7 through 17-12 illustrate the versatility ofthe forms in casting a variety of slab configurations. Flying deckforms may be used to form beam in slab, one-way joist, and upturnedor down-turned spandrel beam configurations. Pan waffles and onewaypan joists are often attached to the top of the deck forms andstripped and flown intact with the deck forms. The versatility of thisforming system provides flexibility for constructing many types ofconcrete structures. Figure 17-7 illustrates the use of the deck forms tocast various shapes of beam and slab designs.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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