Construction of a new £10M quay extension for the Port of Dundee is set to be delivered by the end of the year following completion of the piling work.
Tyneside contractor Southbay Civil Engineering started the design and build work on the quay, which will be used as hub for decommissioning oil and gas infrastructure, in February.
The steel piled quay structure is 200m long and 40m with a 50m by 40m heavy lift area.
Southbay has worked with piling equipment hire company Piletec to ensure efficient pile driving methods were used to install the 210 tubular steel 508mm diameter bearing piles for the quay deck and 40 tubular steel 1,220mm diameter piles for the combi wall.
Hard driving conditions led to Piletec supplying both impact and vibrating hammers for the work.
“The bearing piles support the new concrete deck and vary from 16m to 31m in length,” said Southbay site agent Steven Telford. “The combi-wall piles are driven at 3m centres along the line of the harbour wall with L606 sheet piles as infill.
“The tubular piles were vibrated in to refusal and then the CX110 impact hammer is used to drive them to their final depth.”
The large-diameter combi-wall piles were driven using Piletec’s 815C standard-frequency vibrating hammer, also suspended from a large crawler crane. The smaller bearing piles were installed using the 14RF resonance-free suspended hammer.
According to Telford, the difficult ground conditions mean that the piling work has not been without issues but working with Piletec helped overcome the challenges.
The new quay represents one of the largest investments in the port by owner Forth Ports.