Latest News On Barrier Contracts
Wide Variable Troughed CSB
Following on from the success of the first construction of Wide Variable Troughed Concrete Step Barrier (WVTCSB) on the A2 Dartford Improvement scheme, the team, lead by principal contractor Costain Civil Engineering, Designer Jacobs and Britpave Installer Extrudakerb, faced new challenges as they moved to the next major roads project, the widening of the M25 motorway between Junctions 1b and 3.
Here once again slipformed slot drain and WVTCSB were required but for the first time the team were able to make use of Britpave’s new technical report, “Barrier Guidance Note: The use of the concrete step barrier at bridges” and continue the barrier over major bridges.
As highlighted in the report, a cradle foundation was required and this was cast in advance of the slipform works by the principal contractor.
A slip membrane was provided between the foundation and the barrier.
Expansion joints in the structure were replicated in the barrier using the Britpave Steel Step Barrier design.
The bridges featured a raised plinth and again new guidance available from Britpave and supported by Highways Agency enable this detail to be easily accommodated.
In all, eight bridges will, for the first time, feature the concrete barrier across structures; once again solid evidence of Britpave’s ability to provide marketplace with new, important and innovative designs.
Concrete to this project was supplied by Lafarge and lighting column anchors by Fixing Centre.
For more information, contact James Charlesworth at james@extrudakerb.co.uk Wide Variable Troughed CSB