Omnia Bridge Deck

Our highly efficient, cost effective omnia bridge deck solution has been recognised by the Department of Transport through our involvement with the model specification for precast concrete bridge decking.

The system is available in five standard lattice sizes, which facilitate deck depths of up to 300mm, enabling spans up to 3.8m.

Omnia bridge deck is a 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.

Bison Precast omnia bridge deck has been used for major bridge projects throughout the UK.

 

 

Design

All omnia bridge deck units are designed to Eurocodes standards. Fully detailed layout drawings provide a clear indication of individual unit locations to minimise fixing times on site. Planks are primarily designed to cope with temporary condition loads, however, designers can use the reinforcement provided as part of a permanent design.

Quality Assurance

From initial design through to onsite 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 ISO 9001, ISO 14001, BES 6001 and ISO 18001. All units are designed in accordance with Eurocodes and CE certified to BS EN 15050.

Manufacture

The standard range of bridge deck units is available with five different heights of lattice in a 300mm wide unit. 600mm wide units, where appropriate incorporating non-standard lattice arrangements for use as infill panels, can be manufactured to order.

Maximum lengths of 3.8m can be accommodated to allow for a clear span of 3.69m with a nominal 55mm bearing on each end.

The upper surface of the omnia plank 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 showing the arrangement of the lattice girder and the reinforcement within the precast concrete (see illustration).

Tolerance on given dimensions shall be ± 5mm unless indicated otherwise. 60mm depth of plank does not allow for the exposed aggregate finish, which could add up to 10mm to the overall depth.

Design Benefits

  • All omnia bridge deck units are designed to Eurocode standards
  • Participating formwork – bridge designers can use the reinforcement provided in the omnia deck planks as part of the permanent design
  • Range of deck types available to facilitate deck depths of up to 300mm

Quality Benefits

  • Manufactured under factory-controlled conditions to maintain quality consistency
  • All precast concrete products and processes comply with all relevant standards and are manufactured in accordance with BS EN ISO 9001 and BS EN ISO14001
  • Precast components are CE marked against BS EN 15050

Construction Benefits

  • A 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
  • Handling times minimised utilising the Bison Precast QuickLift system, providing increased output rates up to 20% against other alternative methods
  • Enhanced soffit protection available
  • Nationwide coverage

Suitable Applications

  • Infrastructure
  • Highways
  • Rail

Omnia Bridge Deck Range

Our omnia bridge deck system has been recognised by the Department of Transport through our involvement with the model specification for precast concrete bridge decking.

The system is available in five standard lattice sizes, which facilitate deck depths of up to 300mm, enabling spans up to 3.8m.

Max clear span for slabs of overall depth

Special Deck

Various depth overall slab made bespoke to your specifications.


Bridge Deck Types

Type 1 Deck

For a 200mm deep overall slab

Omnia plank depth 60mm
Overall depth including lattice 115mm
Cover to reinforcement 35mm
Lattice depth 80mm
Allowance for in situ reinforcement and cover 85mm


Type 2 Deck

For a 225mm deep overall slab

Omnia plank depth 60mm
Overall depth including lattice 140mm
Cover to reinforcement 35mm
Lattice depth 105mm
Allowance for in situ reinforcement and cover 85mm


Type 3 Deck

For a 250mm deep overall slab
Omnia plank depth 60mm
Overall depth including lattice 165mm
Cover to reinforcement 35mm
Lattice depth 130mm
Allowance for in situ reinforcement and cover 85mm


Type 4 Deck

For a 275mm deep overall slab

Omnia plank depth 60mm
Overall depth including lattice 190mm
Cover to reinforcement 35mm
Lattice depth 155mm
Allowance for in situ reinforcement and cover 85mm


Ancillary items and enhanced options

Prevent the loss of grout through flanges of steel/unit joints

Ancillary Items

Bituminised compressible strips can be used in conjunction with the omnia bridge deck system. We would recommend that flanges of supporting steel are treated with a bituminised compressible strip prior to placement of omnia bridge deck units.

Joints will need to be addressed to prevent grout loss during concreting. Various methods can be used such as flexible sealant, grout and suitable sealant tapes.


Enhanced soffit protection

sealant tapes

Soffit protection can be enhanced by the application of a suitable treatment which penetrates deeply into the structure to seal voids and block the ingress of moisture whilst allowing the material to breathe.

The protectant seals hairline cracks up to 1.4mm wide protecting the soffits of the Omnia Bridge Deck surfaces from damage caused by water ingress, freeze-thaw and weed growth. It also helps to keep the surface free from dirt and stains.


Non-standard options

Non-standard widths, splayed cuts, cut outs and small bay end make-up pieces are available.

Each unit will be uniquely referenced and highlighted on our drawings.

Omnia Bridge Deck Technical Installation Guide
Omnia Bridge Deck Type 1 Datasheet
Omnia Bridge Deck Type 2 Datasheet
Omnia Bridge Deck Type 3 Datasheet
Omnia Bridge Deck Type 4 Datasheet
Omnia Bridge Deck Type 5 Datasheet
Bison Quicklift Technical Guide
Omnia Bridge Deck Technical Guide
Omnia Bridge Deck Brochure
DOP Bridge Deck

Bridge Deck Quicklift system

The Bison Precast QuickLift System has been developed to ensure handling times are minimised, increasing output rates by up to 20% compared to other methods.

Omnia Precast Bridge Deck

Omnia bridge deck planks are usually delivered on articulated vehicles, palleted in batches of 24 planks (6 deep x 4 wide), to an agreed sequence and time/date.

The omnia bridge deck system can be lifted off the wagon using a traditional forklift truck with pallets placed adjacent to the area to be fixed.

The QuickLift frame should be attached to the crane. If the 8-unit frame is to be used, we would suggest two pallets are offloaded next to each other to further minimise lifting times. The chain attachments should be released and connected to the omnia lattice with the hooks positioned under the diagonal section of steel.

The panels should be lifted in sets of four, approximately 1200mm wide (eight planks will be 2400mm wide, approximately).

When placing, units will need to be butted together to close any gaps and minimise risk of grout loss. It is recommended that a method of setting adjacent ‘sets’ is adopted so that each set is placed at 1200mm intervals. This will ensure the layout of the planks close to that on the drawing, keep the number of gaps to a minimum, and reduce the risk of any cutting or make-ups due to creep.

Chain shorteners are provided to allow the length of the chain to be adjusted to facilitate installation.

 

Omnia Bridge Deck planks

Omnia Bridge Deck System

Omnia Bridge Deck System

 

Case Studies

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Catthorpe Interchange Project
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A483/A489 Newtown Bypass

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