Foynes Harbour, West Jetty, Limerick

  • Client: Shannon Foynes Port Company Limited
  • Value(€ million): 12
  • Value($ million): 16
  • Completion date: 2001
  • PUNCH services: Civil, Structural, Marine, Project Management

PUNCH Consulting Engineers was the Project Manager and Structural Engineer for the development of the west jetty in Foynes Port. In the early nineties, Foynes Harbour Trustees recognised the need to develop a modern deep-water facility capable of handling vessels up to Panamax size. Planning permission for the works including new jetty facility, dredging and provision of port related infrastructure was issued in January 1997.

Based on pre-feasibility study, PUNCH Consulting Engineers initiated a preliminary design review that led to the sequence and the extent of the works as follows: Set up a flow model of the port and carry out siltation monitoring prior to completing navigation to determine the best option for new approach to upgraded berths; carry out the new jetty constructions works as a single contract including any ancillary works (installation of new navigation lights etc.); complete the works with a separate dredging contract.

Conceptual engineering design concentrated on the extension of the existing West Jetty eastwards for a distance of 164 metres and upgrading of the existing 106m jetty. Following the extensive studies and site investigation, it was concluded to disregard the existing structure as a permanent structural support in any new scheme.  For the upgrading of the existing structure, it was decided to pile through the existing deck and to cast a new in-situ flat slab supported on the new piles. The structure of the extension is designed as a composite concrete three-span deck spanning continuously between support beams running longitudinally along the length of the extension. The concrete deck is 550mm thick consisting of 200mm solid pre-stressed concrete slabs topped with 350mm of in-situ reinforced concrete.  The precast beams are 1500mm wide and 850 mm deep and span from pile to pile. These piles are 1067mm outside diameter, with a wall thickness of 25mm.

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