Bridge Construction Technology

The Freyssinet group of companies is at the forefront of bridge construction technology worldwide. Of the many methods by which a gap can be bridged, four of these are prevalent in Malaysia and Freyssinet PSC (M) Sdn Bhd is proud to have been instrumental in their introduction locally.

They are:

  • The Balanced Cantilever (or ‘BCM’) Method
  • The Incremental Launching (or ‘ILM’) Method
  • Cable Stays and,
  • Segment or Beam Erection
Balanced Cantilever Method

The bridge is segmentally constructed with the segments usually cast in-situ. In-situ concreting is undertaken by means of steel carriage form travelers supporting the formwork and proceeding symmetrically on either side of the supports. Inner forms are supported by a mobile frame moving within the deck.

They are generally of two types;

Travellers with Upper Trusses are widely used and have the main support trusses located on the deck. Their disadvantage is that these trusses jam up the deck, hindering working access.
Travellers with Side Trusses are those with the main trusses located on the sides, under the segment’s upper flanges.

The deck is relatively clear for working access and the side forms also contribute to the traveller’s strength like a self-supporting, rigid mould.

Incremental Launching

This method is where the deck is built in successive segments over a rigid pre-fabrication bed on one of the banks of the gap to be spanned.

This deck is then pushed into place as whole spans or in segments which makes rooms for carrying out the following span or segment without interruption.

A steel nose in front of the first span permits the reduction of the cantilevered deck length before a pier is reached.

It has numerous advantages such as suppression of falsework, formwork reduction and optimization, improved repetitive cycle efficiency, limited special equipment investment etc.

Cable Stayed Bridges
The Freyssinet Stay Cable and its technology, first developed in the mid-1970s, has been continuously improved on ever since. It is now the reference, in terms of fatigue resistance, corrosion protection, inspectability and replaceability.

The Freyssinet HD stay cable where each strand is completely independent, has many advantages including;

  • individual installation and tensioning of each strand
  • individual protection against corrosion and,
  • individual removal and replacement if/when it is necessary.

It is with advantages like these that the Freyssinet Stay Cable has been chosen for both new installations as well as for the replacement of other-system cables that are nearing the end of their lifetimes.

Segment and Beam Erection

Freyssinet is a widely experienced specialist in the erection of precast bridge/viaduct segments by two main methods, viz,

Cantilever Construction where segments, prefabricated in ‘factory’ (casting yard, facilities) are transported by segment transporters to the erection site where they are symmetrically installed each side of the supports using,

  • autonomous equipment, independent of the deck: cranes, gantry cranes etc.
  • mobile handling equipment fixed to the deck: winches and swivel cranes
  • launching girders
Launching Gantry Erection with a launching truss that is completely autonomous. It is fitted with its own generating set/s and propels itself along the structure under construction while bearing on the piers by means of retractable struts fixed to the lifting trolley (as with the system used for the STAR Line of the Kuala Lumpur Light Rail Transit system).

We welcome your enquiries on how our Bridge Construction Technology may be incorporated into your Bridge Construction Project towards its smooth and expeditious commencement, progress and completion. We would be happy to assist you at the Concept, Design or Implementation stage, whether you are the structure’s Owners, Engineer/Consultant, Main Contractor or Sub-Contractor.