Projects - Malahide Estuary Bridge

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PROPERTIES & RESIDENTIAL

MALAHIDE ESTUARY BRIDGE

Key Facts

Client: Iarnród Éireann
Sector: Infrastructure/Transport
Value: €750K
Survey Type: Laser Scanning, Monitoring, Hydrographic Survey and Monitoring, Bathymetric Survey,
Area: 75,000 m2
Resources: GPR, Laser Scanner, Total Station, AutoCAD
Project Duration: Ongoing since August 2010

Client Requirements:

-	To initially assess the scene of the collapsed rail bridge and provide real-time monitoring data of all the structures involved (above and below the waterline) and located in the immediate vicinity
-	A full Laser Topographic survey of the area and all surrounding structures
-	Installation of monitoring equipment
-	Hydrographic surveys and monitoring

Murphy Surveys Solution:

-	Given the location of the bridge, Murphy Survey in collaboration with Geodata developed bespoke sea-water resistant tilt sensors and cables to be installed under-water
-	Working hand in hand with the Irish National Rail Network Engineers, Murphy Surveys prevented further damage to occur: when the vibrations caused by heavy duty machinery and equipment for the re-construction on site exceeded the safety requirements, the works were stopped and the re-construction re-organised to meet the safety requirements, despite the pressure from many parts
-	The long-term monitoring of the bridge allowed to spot seasonal influences on the structure, which are taken into consideration to prevent accidents in future.
-	Daily bathymetric surveys on the east and west sides of the viaduct were carried out to enable to monitor the stability of the slope and the scour hole that was identified. Cross sections were then produced from this data and cross referenced daily.
-	Bathymetric survey that extended 2km east and west of the railway viaduct was carried out to create a hydrodynamic model of the area for reinstating the weir to the correct level. In addition to that, electronic water level gauges were placed on both sides of the viaduct to establish the relationship between the incoming and outgoing tide.

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