Rotary Bored Piling, CFA Piling, Relief Drilling for Sheet Piling and Driving Sheet Piles

Title: Dublin Port - Cross Berth Quay

Client: Roadbridge / L&M Keating JV

Solutions: Rotary-Bored Piling, CFA Piling, Relief-Drilling for Sheet-Piling and Driving Sheet Piles

The Roadbridge / L&M Keating Joint Venture (RBLMK JV) appointed Quinn Piling for the marine drilling and piling works for the upgrade and new berthing facilities at Dublin Port Cross Berth Quay. The works form part of the overall Alexandra basin masterplan.

Quinn Piling engineering department developed a novel methodology and sequence of enabling works for the construction of a combi-wall as the piles were not able to be solely installed by driving.

The works comprised the installation and 'mucking-out' of 107 large diameter temporary pile casings (1.8m diameter) to a depth of 27m to get through the difficult Dublin boulder clay layer and enable the JV to follow closely behind to pitch and drive the 1.4m diameter permanent steel tubular piles a further 9m deeper. Our engineering department manufactured a special pile top 'pile-gate' to ensure the permanent tubular piles were driven vertically and installed in the correct position with correct rotation to a lower level within the 1.8m temporary casing to ensure the sheet piles, which would be installed later by Quinn Piling, would fit perfectly between the tubes without the risk of de-clutching.

Quinn Piling mobilised its MAIT HR 420 – 800 (an impressive 140 ton piling rig) which made light work of the large diameter piles in the Dublin boulder clay. Quinn Piling’s large diameter pile-oscillator was used to withdraw the 6m long 1.8m diameter segmental casings. This enabled the piling rig to concentrate on inserting casings and mucking-out, thereby reducing contract duration.

In addition, 183 no. 750mm diameter CFA piles were installed to form a contiguous piled tie-back wall for the main combi-wall design. Quinn Piling value-engineered the steel reinforcement cages to improve efficiency of the main contractor’s design before proceeding with production in the automated cage manufacturing facility in Downpatrick.

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Quinn Piling Limited is a limited company registered in Northern Ireland. Company Registration No. NI041458
Registered Office: 15 Enterprise Avenue Down Business Park 46 Belfast Road Downpatrick BT30 9UP