Product category:
Ground Engineering
News Release from: Tensar International | Subject: Tensar Wall System
Edited by the Buildingtalk Editorial
Team on 13 June 2005
Tensar wall system saves cost and time
Tensar wall system saves cost and time in riverside regeneration scheme
Located in Caerphilly County Borough within the steep-sided River Rhymney valley, in the former South Wales coalfields, New Tredegar is undergoing major transformation through a community focus regeneration project Sufficient space had to be created on riverside land for a primary distribution road (the A4049) and business developments
This article was originally published on Buildingtalk on 8 Dec 2003 at 8.00am (UK)
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The use of site won colliery spoil, provided at an economical rate, delivered real cost savings on the project.
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The River Rhymney is a typical spate river subject to sudden floods with its own run of sewin and resident brown trout; recently re-established after many decades of industrial pollution.
The works to train the river and create land for a highway corridor and business development plateau required the replacement and extension of existing derelict river walls constructed circa 1900.
To cater for estimated flood levels and to provide suitable landform, the reinforced soil walls were constructed to a maximum height of 8.5 metres with 2:1 (H:V) sloping embankments between 7 and 15 metres above top of wall level.
Environment Agency constraints only allowed working within the river from May to October, to reduce problems due to flash floods and environmental concerns.
Tensar Structural Solutions were proposed as value engineered solutions by Alfred McAlpine Capital Projects and technically approved by Caerphilly CBC as Client for the project with the Welsh Development Agency as funding body.
The Tensar Wall System incorporating Tensar geogrids provided a fast, economical and proven solution for the project.
There is little plant or temporary works installation required which might be vulnerable to flooding, so disruption was minimal.
The modular pre-cast blocks have an attractive split-face masonry appearance and are dry laid by hand, avoiding potential river pollution problems, that may be caused by in-situ concrete.
By adopting Tensar Technology, stable structures have been created utilising locally available colliery spoil without the need for piled foundations and reinforced concrete walls which would have required heavy craneage and large plant.
The construction method was to excavate the existing banks back by up to 11 metres.
The Tensar Wall structures are completed in lifts.
Each lift comprises a depth of compacted fill, in this case colliery spoil, topped by a layer of Tensar high strength geogrid reinforcement.
The modular blocks forming the face of the wall are connected to the geogrid using Tensar's unique polymer connector.
The Tensar Wall System is flexible enough to adapt easily to changes in height and the natural river curves.
As the Tensar Wall System is rapid to install, the project was completed within one working season rather than the two or more that were anticipated for alternative construction techniques.
The business development units are now able to be constructed well within the target build program.
Tensar Wall System units are available in a variety of colours, styles and finishes.
They are manufactured from high-quality pre-cast concrete and are easily handled, dry-bedded and locked together with a single shear connection.
*BBA Certificate No O4/R137.
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