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

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Downloaded From : www.EasyEngineering.netPatented Forms for Concrete Floor Systems 375FIGURE 12-12 Installation of cellular units for an elevated fl oor system. (Source:H. H. Robertson Company)on the panels known, and the permissible deflection specified, it isnecessary to select a panel unit having the required moment of inertiaor section modulus, considering the resistance to bending momentand deflection. The panel unit should be selected for a simple span ora continuous beam, whichever is applicable.ww.EasyEngineering.nHorizontal ShoringThis is a system of supporting decking, or wood joists and deckingfor concrete slabs, using telescoping horizontal beams whose lengthscan be adjusted over a wide range. The ends of these shores may besupported on permanent steel beams, concrete beams, walls, or temporarystringers and vertical shores. They are available for clear spansin excess of 25 ft, which require no intermediate supports.Figure 12-13 illustrates a shore consisting of two parts, a latticetrussedtriangular section and a plate section that telescopes into thelattice section to produce the designed length. Horizontal prongs thatproject from the ends of the shores rest on the supporting members.The shores are made with built-in wedges or other devices that permitthem to be set with a camber, if one is desired.The shores are installed at the desired spacing, the end prongsresting on the supporting members as illustrated in Figure 12-14. Thewood joists and decking are installed, and the concrete slab is placed.After the concrete has gained the desired strength, the camber is eliminatedand the ends of the shores are pried far enough away from thesupporting members to permit them to be lowered. Figure 12-15illustrates decking installed directly on top of horizontal shoring.Downloaded From : www.EasyEngineering.net
Downloaded From : www.EasyEngineering.netww.EasyEngineering.nFIGURE 12-13 Horizontal shores. (Source: Patent Construction Systems)FIGURE 12-14 Installation of horizontal shores. (Source: Patent Construction Systems)376Downloaded From : www.EasyEngineering.net
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38 Chapter ThreeExample 3-7A floor
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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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