Lloyd Acoustics, with offices in Ireland, the UK and Poland, successfully secured the tender to design and install a permanent remedial ground anchoring package and shortcrete works to arrest the wall from any further movement.
The south western boundary of the site has a 100m long piled wall installed in 2007 with temporary ground anchors installed at top pile level within the capping beam, then a subsequent 10m bulk dig along the length of the wall was undertaken without any follow on works. Economic factors meant the wall was never built against and retained permanently, leaving the central area of the site and secant piled wall almost undeveloped.
Lloyd Acoustics were engaged as the main contractor for the remedial works programme and took over the site in December 2013, work began on the site setting up temporary offices and storage. A raised support drilling platform was formed. The team installed 33 nr lower level anchors at 5m OD, using conventional drilling methods and 44 nr upper level anchors at 11m OD, using a modified long reach s drill machine. Anchor pockets were broken out of the existing secant piled wall at each anchor location and concrete heads formed for stressing, which was followed up by testing and lock off loads. The entire wall was air/water washed clean, steel meshed and layers of sprayed concrete shotcrete was applied to the face of the wall.
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Adrian O'Rourke, Lloyd Acoustics project manager said: "In 2007, when the recession hit, the wall was never built against for permanent retention. The temporary anchors were check tested and the existing wall was monitored for movement with indications showing the wall to be shifting and the temporary anchors were beyond their safe working load capacity.
"We designed, installed and tested 77 nr permanent self drilled anchors to the existing secant wall and fixed full face layers of mesh, applying a concrete shortcrete finish. A special request of our client was to spray a final layer in a bronze brown, in accordance with the Dublin City Council planning.
"To be awarded this contract was a great achievement for the team and to have completed the works one month ahead of schedule, within budget is testimony to all suppliers, sub-contractors and co-operation with the HSQ management team. Follow on works programme for the new look ornate garden and roads upgrade contract can now be undertaken for full HSQ facelift."
For further information Contact
Tel: +44 (0) 28 9261 0525 (Northern Ireland) or Tel: +44 (0) 161 765 3441 (UK) or Visit: www.lloydacoustics.com
