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

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Downloaded From : www.EasyEngineering.netww.EasyEngineering.nInstallation of Jahn “A” bracket with and without waler in place.(Source: Dayton Superior Corporation)FIGURE 9-29FIGURE 9-30 Erection of plywood panels for the Jahn forming system. (Source: DaytonSuperior Corporation)264Downloaded From : www.EasyEngineering.net
Downloaded From : www.EasyEngineering.netForms for Walls 265FIGURE 9-31Corporation)Inside and outside corner forming. (Source: Dayton Superiorww.EasyEngineering.naccomplished by two workers slipping the sheet of plywood over thesnap tie ends, starting at the bottom and moving the panel from sideto side or up and down to align the holes with the snap tie ends.Figure 9-31 illustrates inside and outside corner forming. There isno special treatment required for inside corners. The wales are simplyalternated. For outside corners, cutting of full-width plywood panelscan be reduced by starting on the inside wall first, using a full 4-ft 0-in.plywood panel. When the outside wall is erected, full panels areinstalled in line with the inside panel; and special filler panels, the samewidth as the wall thickness, plus the plywood thickness, are used tofill out the exterior corner.Expensive overlapping, blocking, and nailing are eliminated byusing the Jahn cornerlock. It is placed over one wale, flush at thecorner, and the other wale may be run free, as shown in Figure 9-32.The cornerlock slips into place with its handle perpendicular to thewale. Nails are driven through the holes on the clamp, and thehandle is pulled around 90°. A snug, tight outside corner is easilyaccomplished.Strongbacks are used for form alignment, and they also act to tiestacked panels together. Loose double 2 × 4 s are used for the strongbacksDownloaded 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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