Product category:
Ground Engineering
News Release from: Tensar International | Subject: Tensar Reduces Power Line Installation Costs
Edited by the Buildingtalk Editorial
Team on 21 November 2003
Tensar Reduces Power Line Installation
Costs
The use of geogrids and Type 1 aggregate as a sub-base produced savings in materials as well facilitating the removal of the roads following the installation for the National Grid.
Installation of forty three miles of 400kV power line across farmland in North Yorkshire posed access and environmental problems for the National Grid Tensar International proposed part of the solution for temporary access roads
This article was originally published on Buildingtalk on 15 Jul 2003 at 8.00am (UK)
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The use of geogrids and Type 1 aggregate as a sub-base produced savings in materials as well facilitating the removal of the roads following the installation.
The project involved installation of pylons across farmland of variable soil quality, with typical CBR ratios between 1% and 3%.
To build temporary access roads that could resist the loads imposed by large trucks, low loaders and cranes, at least 300mm of Type 1 sub-base material would normally be required.
The solution proposed by Tensar International's Support Services Team comprised Tensar SS30 geogrid supporting a layer of Type 1 and 6FT aggregate, to carry the construction traffic.
In addition, to facilitate removal of the temporary roads from the farmland with minimal surface disruption, a lightweight woven geotextile was placed directly over the ground; this acted as a separation layer with no loadbearing function.
By using the Tensar SS30 geogrids to reinforce the roadways, only 200mm of aggregate were required in most locations.
The experience of the National Grid Project Team was that the amount of rehabilitation on access roads that were using geogrid was minimal.
This is in direct contrast to the frequent repairs necessary to access roads where no geogrid is applied.
Client: The National Grid Company Main Contractor: Balfour Beatty Power Networks Sub-contractor: Hewlett Civil Engineering Ltd.
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