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The Omnia lattice girder is at the heart of all the permanent formwork systems from Hanson Concrete Products, and when cast into the precast concrete panel gives it stiffness to support the imposed loads from the in-situ concrete.
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The greater the stiffness of the panel, the greater distance it will span without temporary propping. The stiffness is as a result of the moment of inertia created by the top bar of the lattice girder. This can be increased by a combination of lattice depth, size and frequency. Consequently by increasing the moment of inertia, and as a result the stiffness, a variety of span & propping arrangements can be accommodated.
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Generally, and dependant on the slab depth, Omnia panels will span up to 3.50m without temporary propping, and spans up to 7.0m will generally only require one row of props.
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The propping options include:
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Unpropped
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No props are required, except for localised supports around openings etc. which will be identified on the Omnia layout drawings.
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Post-Propped
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Panels are self-supporting, but will require one row of props placed mid-span prior to placing materials, particularly the in-situ concrete.
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Standard
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Props are typically spaced at 2.50m centres, although these centres can be extended to suit the contractors requirements. Examples are spans in the 7m-11m range.
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OMNIA panels can also be designed to cope with the loads transferred from temporary props, thereby elimanting the need for 'back-propping' on lower floors.
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Temporary props shall remain in position in accordance with the requirements of the relevant code of practice, and whilst their spacing will be shown on the Omnia panel layout drawings, the actual design of the props will be responsibility of others.
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