This project involved the replacement of an under-track culvert on the Limerick to Tuam rail line with 4 new 2.4m x 2.4m precast concrete box culverts. The works were carried out in a short time frame of just 36 hours in order to facilitate a the re-opening of the railway line. The works carried out included ground-works, precast installation, waterproofing of units, installation of gabion units and relaying of railway tracks.
At this site Existing Level Crossing’s XE128 & XE129 were closed and replaced by a 4.50m x 4.50m internal dimension under-bridge, 20m long. The under-bridge was a contractor designed structure.
500m long new access roads were also constructed The installation of the under-bridge took place over 2 days, from 7.00 am Tuesday 16th of June 2009 to 6.00pm on Wednesday 17th of June 2009. The under-bridge is made up of 15no U shaped duct units each weighing approx 20t (i.e. 8no base units and 7no top units). A 350 ton crane was used during the installation both for lifting /replacing the track and also for installing the units.
On day 1, the track was removed, excavation completed, and preparation of base for unit’s. On day 2 the precast units were installed. All sealants and waterproof membranes installed and completion of stitches between units together one erection of temporary handrails.
Please follow link below to see video of precast units being lifted into place: