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

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Downloaded From : www.EasyEngineering.netCHAPTER 15Slipformsww.EasyEngineering.nIntroductionThe slipform method of concrete construction is used for formingboth horizontal and vertical concrete structures. It is often used forforming highway pavements as a continuous operation. The slipformmethod has also been used for forming various types of vertical concretestructures, such as the 568-ft-high Reunion Tower in Dallas,Texas (Figure 15-1). Following are typical types of concrete structuresthat have been constructed with the slipform method:1. Single-cell silos2. Multi-cell silos3. Buildings4. Piers5. Towers6. Water reservoirs7. Vertical shafts for tunnels and mines8. Vertical shafts for missile launching bases9. ChimneysThese are vertical structures, most of which have walls requiringslipforms with two surfaces to confine the concrete. However, somepiers or sections of piers are solid concrete, requiring forms withexternal surfaces only. The concrete linings for vertical shafts are generallyplaced with the external surface against the natural earth orrock, requiring form linings for the inside surfaces only.The FormsThe forms for the slipform method of construction consist of the followingbasic parts:1. Sheathing2. Wales or ribs415Downloaded From : www.EasyEngineering.net
ww.EasyEngineering.n416 Chapter FifteenDownloaded From : www.EasyEngineering.netFIGURE 15-1Reunion Towerconstructed byslipform method.(Source: SundtCorporation)3. Yokes4. Working platform or deck (one or more)5. Suspended scaffolding6. Lifting jacksThese essential parts of a slipform assembly are illustrated inFigure 15-2, which is a section through a wall under construction.This form is raised by hydraulic jacks furnished by ScanadaInternational [1].Downloaded 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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