Our highly efficient, cost effective and practical means of providing permanent formwork to deck slabs of bridges, especially where these span over live roads,
rail tracks and rivers.
We have been the market leader in precast bridge decking technology for over 20 years, and were instrumental in the compilation of the Department of Transport model specification for precast concrete bridge decking. Since that time our product has been used on many major bridge projects throughout the UK, providing us with a wealth of experience in this sector.
All Omnia bridge deck units are designed to Eurocodes standards. Fully detailed layout drawings give you a clear indication of individual unit locations, minimising fixing times on site. The planks are primarily designed to cope with temporary condition loads. However, designers can use the reinforcement provided as part of the permanent design.
From initial design through to on-site logistics, all aspects of the Bison Precast operation meet the most exacting quality standards. These are maintained by our own in-house Quality Inspectors, and audited by external certification bodies. Our precast facilities meet the requirements of ISO9001, ISO14001, BES6001 and ISO18001. All units are designed in accordance with Eurocodes and CE certified to BS EN 15050.
The standard range of Bison Precast bridge deck units is available with five different heights of lattice in a 300mm wide unit. Bison Precast also have the capacity to manufacture 600mm wide units and can incorporate non-standard lattice arrangements for use as infill panels.
Maximum lengths of 3.8m can be accommodated which will allow for a clear span of 3.69m with a nominal 55mm bearing on each end.
The upper surface of the Omnia planks is water washed during manufacture to expose the aggregate, which, together with the projecting lattice, accommodates horizontal shear stress at the precast/in situ interface. The manufacturing tolerance and soffit finish (Type F2) are as specified/defined in Series 1700 ‘Specification for Highway Works’.
The units are designed to carry construction loading and limit deflections to span/400 and crack widths to 0.1mm in the temporary case. Wherever possible, the correct size of lattice girder will be selected to provide a chair for the top mat of reinforcement. These are aligned during manufacture to ensure ease of fixing longitudinal reinforcement over the Omnia Bridge Deck planks.
Plank cross section
A typical cross section of a plank shows the arrangement of the lattice girder and the reinforcement within the precast concrete (see illustration above).
Tolerance on given dimensions shall be ± 5mm unless shown otherwise. 60mm depth of plank does not include for the exposed aggregate finish, which could add up to 10mm to the overall depth.