Project Description

Dublin Port Company (DPC) is a state owned company which primarily provides port infrastructure used by private sector cargo and terminal operators.

The Alexandra Basin Redevelopment (ABR) project comprises:

  • Construction of approximately 3 km of quay walls;
  • Dredging of approximately 6.4 million m3 of material to deepen the navigation channel and harbour basins;
  • Remediation of approximately 0.5 million m3 of contaminated dredge spoil which is to be re-used as fill material; and
  • Conservation of the port’s Victorian industrial heritage.

The areas of works comprising the ABR project area:

  • Alexandra Basin West, comprising;
    • Cross Berth Quay (CBQ)
    • Ro-Ro Mooring Jetty
    • Alexandra Quay West
    • Ocean Pier
    • North Wall Quay
  • New Berth 52, comprising;
    • Berth 49 dolphins
    • Berth 52 quay wall and mooring jetty
    • Reclamation

The reconstruction of berths 26, 27 (CBQ), 28 and Ocean Pier (berths 32,33,34 and 35) forms part of the overall Alexandra Basin Redevelopment (ABR) redevelopment project which is being implemented by DPC as part the Masterplan 2012 to 2040. The Alexandra Basin Redevelopment (ABR) at Dublin Port involves the redevelopment of existing berths within the basin which increases the port’s ability to handle large sea going vessels (Cruise, RORO, Bulk, LOLO) and increase container handling capabilities.

Malachy Walsh & Partners (MWP) was commissioned by Roadbridge/L&M Keating JV (RBLMK) to complete the detailed geotechnical and structural design for the new quay structures at berths 28, 33 and 34 as well as the deck/pavement design at the cross berth quay (CBQ). This involved further development of the initial designs on behalf of DPC and the application of value engineering to optimise the design, improve the project programme and minimise risk to the project. Significant geotechnical input was required for the substructure design particularly the deck design over the existing graving dock 2 (dry dock with a clear span of around 30m) and reanalysis when very hard obstructions encountered during concrete piling works. Pile design included large diameter (1400mm) steel tubular piles for the combi wall berthing face, 1200mm diameter reinforced concrete anchor piles and 900mm diameter deck support piles at berth 28 and 762mm and 914mm tubular steel piles for crane rail support and combi wall anchoring at berths 33 and 34. Works involve the design of all new quay elements (combi-wall/crane rail beam/anchor piles/RC cope beam/services/drainage/pavement/quay furniture/fenders), client submissions with CAT III review process and PSDP.

The new quay structures include the following:

  • Quay wall, incorporating a combined system of tubular piles and infill sheetpiles;
  • Concrete cope beam;
  • Suspended concrete deck structure supported on concrete piles (at berth 28);
  • Reinforced earth embankment at graving dock 2
  • RC ground bearing pavement slab at graving dock 2
  • Piled crane beam at berth 33 and 34
  • Tied combi wall anchor piles at berth 33 and 34
  • Fendering
  • All deck furniture including bollards, rails etc
  • Services design
  • All temporary works designs