doesn’t tip over Clips only take VERTICAL loads Usually just 1 wing sticking out for the walls – less easy to shake loose Once forms are set remove left and right forms & remove tie rod (left with a hole) – can patch up or leave
34 Components – formwork for walls Thru tie rod Wing nut (single wing design resists movement under vibration) Spacer tube Polythene cones Rod coupler (only for thick walls) Formwork for concrete columns • multi -purpose panel with continuous rows of tie holes may be used for the construction of smaller/odd size columns • 4 panels assembled in the configuration depicted below can create a variable form for square or rectangular columns with adjustment in 50mm increments from 150mm to 550m Remains in place, leaves 2 smaller holes = good for watertight (doesn’t go whole way through) Form for the top half of the wall Supported on the bottom half of the wall- needs anchor points Panel raker bracket connects rakers to the side ribs – need 2 to provide stability
35 Formwork for concrete columns – FORMATUBE – for circular columns • constructed from laminated plies of fibre, exterior is of laminated tar and fibreglass impregnated paper, inside surface is coated with 0.02mm PE • sizes 254mm – 610mm ID • cut to length using a handsaw • bracing required • left in place to prevent moisture loss • strip 1 to 5 days after curing • two vertical cuts up the column and pull forms off, or peel spirally = easy to remove • Column Forms are a spirally wound metal column former = easier way to cover a column = curl a thinner rectangular piece around it • remove by spirally unwinding the metal former once the concrete has set leaving a fine spiral mark that is easily removed by light sanding • m ade from 0.55mm zincalume steel & supplied in lengths of up to 8m with costs at a per metre rate • diameters are available from 200mm up to 2400mm, minimum length of 600mm Bar Coupling Systems Coupler Selection – 4 main types which require different fixing methods 1. Tapered Thread coupler – designed to suit the majority of applications which require the joining of reinforcing bars – the ends of the rebar are cut square and a tapered thread is cut onto the bar to suit the tapered thread coupler. The sleeve is tightened onto the threaded bar end using a calibrated torque wrench. 2. Bartec system – one of the smallest couplers in the Ancon range – The ends of the bars are enlarged and a parallel thread is cut onto the ends to suit the threaded coupler – The coupler is assembled using a pipe or chain wrench = enlarge ends so when threaded = has the same diameter as non-threaded end 3. Bar X-L couplers – a full strength joint and are the smallest couplers in the Ancon range – appropriate for applications where fatigue is an issue – ends of the bars are cut square and marginally enlarged. A parallel thread is then rolled onto the ends to suit the threaded sleeve – coupler is installed using a pipe or chain wrench 4. MBT (mechanically bolted) – suitable where it is not convenient to have the bar ends prepared for parallel thread or tapered thread couplers.
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