Peterhead Harbour Deepening

Title: Peterhead Harbour

Client: McLaughlin & Harvey Ltd

Solution: Odex Piling, Grouting and Rock Anchors

As part of the £35M harbour development project a new anchored, rock-socketed steel combi-wall was installed in front of the existing quay wall to enable the deepening of the inner harbours.

The project involved the installation of approximately 1,200 No. x 610mm OD steel piles 13.5m to 17m in length, complete with clutches. The piles were drilled 7m deep into granite rock using an innovative installation technique similar to Odex overburden drilling systems. Piling rigs were generally able to work from the existing quay edge, where a 4m deep steel fabricated 'gate' acted as the temporary piling guide.

Once a complete gate of 14 No. piles were installed, the annulus around the steel piles were pressure-grouted using a high pressure grout pump and a method specifically developed by Quinn Piling at their testing facility in County Down prior to the site works, to the approval of the project engineers.

In addition to the piled combi-wall, Quinn Piling undertook the design, installation and testing of approximately 250 No. anchors. These anchor the new reinforced concrete quay cope back to rock, with safe working loads of 110T, by using 63.5mm double corrosion protection threaded bar installed to 22m depth at 45 degrees. The anchor rig, a remotely controlled Komatsu PC 450 excavator with modified dipper-arm and bespoke drill mast, was developed and manufactured by the Quinn Piling Engineering Department in Downpatrick. The anchor rig was located on top of the existing quay with the capability to reach the anchor location 3m below the rig and drill back under itself and through the existing quay. The extra-long mast enabled the anchor to be cased with a single long casing without the requirement for welded joints in the tidal zone, which would have delayed the program of installation.

The works were undertaken within a fully functional live port, in tidal conditions, with 3 no. piling rigs and 2 no. anchor rigs, co-ordinating works at different quays within the harbour simultaneously.

 

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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