Dun Laoghaire Marina / Promenade, County Dublin
REINFORCED EARTH PRECAST FACING

 




 
Structure Details Max. Retained Height : 5m Surface area : 4 300m2 Completed : 2001

500m long double-sided TerraClassTM retaining walls forming a marina inside Dun Laoghaire Harbour
Client: Dun Laoghaire Harbour Company Project Consultant: Mouchel
Contractor: Ascon Ltd Design: The Reinforced Earth Company Ltd

As part of the continuing development of the existing Dun Laoghaire Harbour, there was a requirement for a 430m long breakwater.
During the project tender, the main contractor Ascon Ltd offered an alternative design for the breakwater using the Reinforced Earth Company TerraClassTM system with Paraweb soil reinforcements. This alternative demonstrated significant cost savings over the reinforced concrete caissons shown in the project tender documents. The Reinforced Earth Company design was accepted by the client and Ascon Ltd was awarded the project using the Reinforced EarthTM TerraClassTM precast concrete facing panel design.
Construction of the breakwater commenced in the summer of 2000 following the completion of dredging works and placing of the submerged rock fill core. Construction was substantially completed by November 2000.

The construction was performed between tides by starting from the shore and progressing into the harbour. In this way all the labour, plant and materials required for construction travelled along the partially completed breakwater from a land base. This procedure virtually eliminated the need for expensive floating plant.

The TerraClassTM breakwater was designed to withstand traffic loading, diurnal tidal variations and a substantial lateral wave force from a specified 'design wave'. Furthermore, by using the synthetic Paraweb soil reinforcement strip and connection system, potential corrosion difficulties were eliminated.
This project demonstrates the suitability and cost savings that can be achieved by using the Reinforced Earth Company TerraClassTM and Paraweb reinforcement systems in marine applications.
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