By Geoffrey Lee, Peter McAdam
No optimise formwork charges and minimise the time for its development, the contractor must comprehend the guiding rules of secure and effective formwork development. He should also have a few perception into the relative advantages of the.
summary: No optimise formwork expenditures and minimise the time for its building, the contractor must comprehend the guiding rules of secure and effective formwork building. He should also have a few perception into the relative advantages of the
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Extra info for Formwork : a Practical Guide
If the fixings are to have a structural function, for example, achieving composite action in a tableform or strengthening a wall form for crane hoisting, then the fixings must be arranged to cater for this situation. Information on the load capacity of the fixings must be sought from the manufacturer so that the formwork designer is able to calculate the type and spacing of fixings. The fixing requirements will vary from case to case. This book can only give an overview of the more common types and their use.
Here the production quantities are sufficient to justify the high die costs. Aluminium is available in stress grades roughly equivalent to normal structural steel. Unfortunately, aluminium has an elastic modulus approximately 40% that of steel and, section for section, the deflection of aluminium is proportionately greater than the steel beam. Nevertheless, its lightness and durability make it an attractive formwork framing material. FORMFACE MATERIALS. The general principles applicable to the selection of satisfactory formface materials were given previously.
40 Formwork: A Practical Approach Unfortunately, sawn timbers are often supplied with unacceptable size variations. To cater for this, it is common practice for timber to be uniformly ‘sized’ smaller than the nominal size. g. nominally 50 mm joists would be sized to 45 mm. This reduction in material should be taken into account in the formwork design calculations. Accurate sizing is essential in those timbers that directly support the formface material. To have variations in joist or stud sizes would inevitably lead to a wavy line in the finished concrete face.