Product category:
Ground Engineering
News Release from: Aarsleff Piling | Subject: Manchester access road
Edited by the Buildingtalk Editorial
Team on 07 March 2006
Aarsleff props up Manchester access road
Aarsleff Piling has worked closely with main civil engineering contractor Birse to prop and support a new concrete access road slab cast on top of an existing live road slab.
Aarsleff Piling has worked closely with main civil engineering contractor Birse to prop and support a new concrete access road slab cast on top of an existing live road slab, which is at risk of possible collapse into voids below Aarsleff is installing precast concrete piles driven through holes cut through the old concrete slab
This article was originally published on Buildingtalk on 26 May 2005 at 8.00am (UK)
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After driving, all the piles were sawn off to the same level to act as simple props and provide the support for the new slab resting on top.
The existing 20 m wide concrete road provides access to the Royce Trading Estate next to the Trafford Park shopping complex in Manchester.
It was originally cast onto a series of transverse supporting brick walls spaced at about 2 m centres with voids below ranging from 300 mm to over 2 m deep.
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The original road was built on the site of a factory containing asbestos.
As a precaution against the small risk of possible contamination to Aarsleff's crew from any asbestos residue that may have been present in the voids, the piling team wore protective clothing and masks.
This safeguard was supported by Birse employing the specialist company Winsulate to constantly check and monitor for the presence of asbestos during the project.
TGA Building Consultancy was appointed project manager, planning supervisor and party wall surveyor in 2003 to explore the various options for reconstruction.
Following Aarsleff's successful test piling at the site for Birse at the end of 2003 and subsequent design of the road slab and support structure by London based consulting engineer Clarkebond, Aarsleff embarked on the main piling in two separate phases.
To maintain vehicle access during construction Birse arranged to complete each carriageway in turn.
Birse started on site in September 2005 and first saw cut square holes in the existing 200 mm thick slab at the pile locations.
Aarsleff's team, complete with protective clothing, then followed on with its Banut 700 self erecting fixed leader piling rig, running on load spreading navvy mats, installing the required 300 mm and 350 mm square section fully reinforced precast concrete piles with a maximum working load of 1100 kN.
The piles, between 8.5 m and 9.5 m long and manufactured by Aarsleff's subsidiary Centrum Pile, were driven to refusal in rows at just under 6 m centres through sandy clay to toe into the underlying sandstone.
On completion of the first carriageway piling, Aarsleff left site for Birse to follow on sawing off all the driven piles to the same level and casting the new 300 mm slab on top so that it simply rested on the supporting piles without any tying in.
Aarsleff later returned to complete similar piling for the adjacent second carriageway and on schedule for Birse to complete the project in February 2006.
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