OCSC were appointed by Harcourt Developments to carry out the Civil and Structural design of the extension to Portlaoise Shopping Centre
The extension comprised the construction of a triple level basement carpark with retail space at ground level in the form of one large anchor tenant space for Tesco with a number of ancillary retail units.
Basement construction form comprises Reinforced Concrete frame construction with 8m span precast wideslab units spanning between 16m spanning Post Tensioned beams. The columns were founded on insitu reinforced concrete pads supported on Limestone Bedrock. Anti floatation anchors were used to prevent hydraulic uplift. A secant pile retaining wall retains the surrounding roads and buildings adjacent the basement excavation.
These secant piles were faced with precast panels incorporating a vertical drained cavity to provide a cost effective structural solution.
The retail superstructure above ground level comprises steel frame construction on a 16 x 16m column grid. Lateral stability is achieved via horizontal roof bracing acting in conjunction with a combination of vertical cross bracing and reinforced concrete core walls.
OCSC provided all civil and structural for the development commencing with a due diligence of a previous design and partially constructed basement, through to detailed design, contract documentation and monitoring of construction on site.