Product category:
Ground Engineering
News Release from: Tensar International | Subject: Liverpool John Lennon Airport
Edited by the Buildingtalk Editorial
Team on 20 April 2004
Tensar Keeps The Peace For John Lennon
By using Tensar geogrids, construction of the new runway extension to Liverpool John Lennon Airport was accelerated.
The new runway extension to Liverpool John Lennon Airport brings increased traffic capacity for this important regional airport, but had threatened noise pollution for historic Speke Hall, local residents and the airport car parks By using Tensar geogrids, contractor Brock Civil Engineering constructed a noise protection bund with locally won material in only 7 weeks, thus allowing the construction to be accelerated
This article was originally published on Buildingtalk on 15 Jul 2003 at 8.00am (UK)
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This also avoided the significant time and expense of using wrap around techniques for the steep faces required to minimise land grab.
The noise protection bund is around 350 metres long and 7 metres high, containing 40,000m3 of material, with an airside face sloping at 1:1, and the public face at 1:2 (v:h).
The local sub-soil conditions are sandy, and the bund was constructed over a base of Tensar Basetex high strength knitted geotextile, followed by compacted layers of locally won sand fill, reinforced with horizontal lengths of Tensar 55 RE and 40 RE uniaxial grid placed at 500mm vertical intervals.
The bund is finished with a layer of Tensar Mat, a 3-D anti-erosion mat.
This is anchored in trenches at the base of the bund, over a layer of hydra-seeded local topsoil.
Project Engineer Neil Rigby commented: "Working with consultants Scott Wilson and the Tensar Technical Team, we were able to devise a solution that achieved the steep slope required to minimise the base area of the bund, without using a wrap around face with bagwork, which would have delayed the installation and added cost." As well as seeding, the bund will eventually be landscaped with shrubs, to form an attractive amenity that will be a prominent feature in a generally flat landscape.
Client: Liverpool John Lennon Airport.
Consulting engineer: Scott Wilson.
Contracting Engineer: Brock Civil Engineering.
Management contractor: Bovis Lend Lease.
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