Main entrance to Portlaoise Shopping Centre.

Portlaoise Shopping Centre

Phase 1 of this project, carried out in 2007, required the construction of a triple basement with a retained height of 13.5 metres. Over most of the site the rock level within the basement was 3 to 4 metres above formation level.

Our proposed solution was to provide a secant pile wall with 900mm CFA stiff piles and 640mm ODEX hard piles at 1.0 metre centres.

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The 900mm diameter CFA piles were nominally socketed into rock and the ODEX 640mm piles were drilled 4 to 8 metres into intact rock. The pile wall was restrained by two levels of tie-back anchors.

Phase 2 works were carried out in 2010. The scope of works was considerably smaller than Phase 1 and included: secant piles as described above and 450mm & 600mm diameter CFA bearing piles with SWL’s of 1400 & 2200kN respectively. Both phases included the construction of guide walls, capping beams and both permanent and temporary tie-back anchors.

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