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Delivery
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Omnia panels are stacked on pallets ready for delivery to site on articulated vehicles. If circumstances dictate, we can deliver all but the longest panels on rigid vehicles for which there may be a small surcharge.
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Our contracts staff will liase directly with the site to determine the order in which panels are delivered, andthe timing of deliveries.
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Panels are generally stacked in the order in which they will be needed to be offloaded, with the provisio that any small of shaped panels which may interfere wih the stability of the stack are placed on the top.
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Preparation
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Bearings must be level, and any irregularities must be addressed before any panels are placed. Blockwork may need a dry joint to reduce the impact of point bearing.
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Where units are designed for temporary propping, props must be in place before units are placed.
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Lifting
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A typical 2.40m wide x 50mm thick OMNIA panel weighs 0.31 tonnes/m span. Units must be lifted and placed without jerking to prevent cracking to the panel or damage to the lattice.
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For panels over 6m, and/or where we have determined that there is a danger of damage during the lifting process, a lifting frame will be supplied free of charge. A test certificate will accompany each frame valid for a finite period. (It is the contractors responsibility to ensure that this is maintained).
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Handling & Stacking
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Always lift Omnia panels by the lattice, with the hooks positioned under the diagonal.
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For panels up to 6 metres, the use of four leg chains is normally adequate with the lifting positions at third to quarterpoints from each end.
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For panels longer than this, we provide a suitable frame, incorporating a third row of lifting points.
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Wherever possible, lift units from the vehicle directly into position. Where this is not possible, stack on level ground. Timbers used to separate layers of units must be stacked vertically in line with the main bottom bearers.
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Placing
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Strictly observe the lifting recommendations.
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Carefully check that units with openings, or handed units, are correctly positioned.
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If the holes required for services have not been formed at the precast works, subject to approval by Hanson Concrete Products, these may be formed by placing sleeves in the required position and cutting out the precast portion.
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Checking that all holes, both factory cast and site formed are correctly positioned.
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Check that all units are levelled correctly.
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Check that all props, bearers, edge shutters, etc. are correctly and firmly postioned.
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The integrity of the lattice girder is crucial to the ability of the unit to support the temporary construction loads. Check that additional propping has been placed under the unit at any point where a lattice has been cut or damaged in any way - for example to form a hole.
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Check that, if required by the specification, any significant open joints between the panels are sealed to prevent grout loss. This can be done with a fillet of sand/cement or if necessary a strip of grout soaked hessian.
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Temporary Supports
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Omnia units can be designed to span without temporary supports. In normal circumstances, however, units will require props at 2.50m centres according to the type and spacing of the Omnia lattice girder.
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If propping centres are not shown on the erection drawing and it is not specifically noted that props are not required, the Engineer must be consulted before any units are placed.
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In addition to the temporary propping mentioned above, additional propping at/or near supports may be necessary in the following circumstances:
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Where the top or diagonal bars of the Omnia lattice girder has been cut or damaged.
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Where the bearings are not true or level.
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Where a bearing of less than 40mm is provided.
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Protection Against Falls
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In line with the PFF Code of Practice, the erection of Omnia units will be subject to the application of a hierarchy of safety systems as recommended by the HSE. There is a range of measures available from passive systems such as working platforms; staging, safety nets and air bags to active systems such as work restraint/fall arrest using safety harnesses.
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Passive systems afford the best level of fall protection and should be used whenever it is reasonably practical to do so. Where possible Omnia units should be designed as unpropped or post-propped, thus enabling the use of passive fall arrest.
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