Product category:
Ground Engineering
News Release from: Tensar International | Subject: Retaining Wall System
Edited by the Buildingtalk Editorial
Team on 29 September 2003
Tensar Retaining Wall System Wins More
Ground
By using Tensar International's TW1 wall system, instead of conventional reinforced concrete, developers anticipate potential savings.
To obtain the maximum area for development on their site at Feddon Hill, Fortrose, Rosshire, O'Brien Properties needed to stabilise an embankment adjacent to a disused railway, to allow construction of a perimeter road for a further 29 homes By using Tensar International's TW1 wall system, instead of conventional reinforced concrete, the developers anticipate potential savings in materials, labour and time as well as satisfying the planners with a more sympathetic appearance, as part of a local woodland trail
This article was originally published on Buildingtalk on 25 Feb 2005 at 8.00am (UK)
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John MacRitchie, Project Manager commented: "This is a site we have been adding homes to for nearly 20 years.
It has more than 100 homes, and we wanted to make room for a further 29 at the far end.
To achieve this number we then needed a road for the residents, and a retaining wall was required to stabilise the embankment.
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The solution we originally envisaged was to create a concrete retaining wall, which is very labour intensive." "We were then introduced to the Tensar retaining wall, and it has potential for good savings on materials, time and labour; we can also use site-won spoil to a great extent, rather than imported fill.
The planners were also much happier with the appearance of Tensar's facing blocks, which look like grey stone, than the more brutal appearance of concrete, as the old railway line has now been converted into a walk up to Feddon Hill." The embankment is approximately 110 metres in length with a height rising from 3.6 to 6.4 metres.
The designs and drawings for the TW1 retaining wall solution were prepared by Tensar's Technical Support Services for O'Brien Properties to submit to the Highland Council and the Roads Department, and Tensar also provided on-site installation advice and support.
To create the embankment and retaining wall, the original embankment has been excavated down to original ground level, about 6 metres back into the hill.
It is then rebuilt with layers of Tensar 55RE uni-axial geogrid with a vertical spacing of 0.45 metres, and backfilled with the site spoil.
The geogrids are connected by a unique high-strength polymer key to the Tensar pre-cast modular facing blocks (TW1), which are dry laid at a nominal angle of 86degas the wall facing.
Following this, the road can be constructed using conventional techniques to serve the new houses.
The current phase of the Feddon development is planned for completion in mid-2004.
Client and building contractor: O'Brien Properties Ltd Consulting engineer: Nortec Survey and Design.
Tensar's retaining Wall System has British Board of Agr?ment (BBA) Roads and Bridges certification and consists of modular pre-cast concrete facing blocks and geogrid, which reinforce the granular fill behind.
The geogrids are connected to the block wall by a unique high-strength polymer 'key'.
Blocks and geogrid rolls are all designed for one-man lift.
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.
A block wall system specially designed to allow a fa?ade of architectural masonry or brickwork to be secured using stainless steel wall-ties is available, where the site demands.
The Tensar manufacturing process produces a unique grid structure, consisting of full strength junctions and stiff ribs, which present a thick square leading edge to the aggregate.
This allows the aggregate particles to grip the geogrid and forces an effective mechanical interlock, which prevents lateral movement and dilation of the particles, so that a very high effective angle of shearing resistance is mobilised.
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