Road Structures

The ongoing Highways Agency A66 Carkin Moor to Scotch Corner project involves upgrading the original single carriageway to address safety concerns, particularly at junctions and crossings. Where differential settlement is threatening a remodelled junction, Tensar International's new TriAx geogrid provides an additional dimension of stability, saving design and build contractors Balfour Beatty Regional Civil Engineering Limited (BBRCEL) the heavy time and costs inherent in conventional remedial solutions and

Tensar is making some key moves internationally, as well as in terms of market segments. The company is now marketing the GlasGrid range in the US and expects to develop healthy sales, however it sees major growth potential with the Geogrid product range. Jim Penman, director for bi-axial products & applications said: "One area we're moving into is base reinforcement and in particular what we're looking at is mechanistic emirical (ME) technology." Tensar has worked with the University of Illinois on a new d

Underground construction in the world is increasing, metal ores are mined deeper, and there is an ever-growing demand in emerging countries for metals, infrastructure and energy.

Plans are in hand to upgrade the Bayonne Bridge in the USA. The Port Authority of New York and New Jersey intends to raise the central span of the bridge from its current height of 46-65.5m. The port authority has approved a US$1 billion grant for the project. The work is needed to allow larger vessels to pass under the bridge by 2014. Other options have included building a new bridge or constructing a road tunnel but the upgrades to the Bayonne Bridge have been regarded as the most cost effective.

Progress is being made in the Czech Republic on two key urban tunnel projects. In capital Prague, the Czech contractor Metrostave has now completed the drilling portion of the Letna section of the Blanka road tunnel. Local residents have complained about the noise, vibration and cracks in their properties that they say have been generated by the drilling and blasting work. The project looks as though its completion date will be later than first planned however.