N22 Tralee Bypass Scheme Underway

Cork-based contractors BAM Building Limited has commenced ground Investigation Works on the N22 Tralee Bypass/Tralee to Bealgrellagh Road Improvement scheme. The scheme has two main components, namely the N22 Tralee Bypass and the N22 Access Route (Tralee to Bealagrellagh).

The N22 Tralee Bypass will link the N69 Listowel Road with the N70 Killorglin Road via the N21 Limerick Road. It will comprise a ‘Type 2 Dual Carriageway’ road and will be approximately 8.0km in length. The N22 Tralee to Bealagrellagh will provide a separate access route for the N22 Killarney Road and will comprise a Standard 2-Lane single carriageway road and will be approximately 5.5km in length.

The proposed contract for the scheme shall comprise the following works: To establish the ground and groundwater conditions along the route of the proposed road.

The scope of the ground investigation includes but is not limited to the following: Trial pits at about 100m centres along the carriageway. Limited number of cable percussion boreholes in deeper cuttings and embankments. At each proposed overbridges cable percussion boreholes with rotary follow-on, where required, to determine appropriate founding stratum. Testing regime to include but not limited to sub-grade strength, shear strength of soils, index testing, compaction, oedometer compression, and contamination test amongst other tests. The location of all site investigation locations shall be as directed by the Engineer’s Site Representative. All testing to be scheduled by the Engineer’s Site Representative. The location co-ordinates and level to Irish Datum of all investigation locations shall be surveyed and recorded by the Contractor.


The scope of the geophysical investigation includes but is not limited to the following: Continuous 2-D Resistivity profiles along the proposed road route and side roads at selected chainages. Continuous Seismic Refraction profiles along selected cut and fill sections of the proposed road route, at 100m intervals at selected chainages and as parallel profiles at selected structures.Continuous MASW profiles along selected fill sections of the proposed road route, and as parallel profiles at selected structures.Microgravity survey to be carried out in areas of potential karst to identify the extent and significance of limestone karst features such as collapsed sinkholes, infilled dissolution features with pockets of soft compressible material, open conduits or caves. Plot relevant borehole and rotary corehole information from the preliminary and detailed ground investigations on the geophysical profiles. The location of all geophysical investigation locations shall be as directed by the Engineer’s Site Representative.

Works on the €90 million scheme are expected to be complete in the first quarter of 2013.

For further information: www.cisireland.com