Kildare Route Project, Contract 3

Kildare RouteName:    Kildare Route Project, Contract 3
Client:    Iarnrod Eireann, Track & Signals HQ
Project Value:  €17m
Completion Date:  July 2009

Project Description:

The construction works limited for this site are as follows:
The provision of two extra tracks on the Up side (North side) of the existing railway line to create a four track system to the immediate north of the existing rail corridor. The four tracks will extend from chainage 17,000m to chainage 19,240m. At chainage 19,240m, both the Up fast and Up slow together with the Down Fast and Down Slow will merge back into single Up and Down line, i.e. the four track arrangement will taper to two tracks.

Bridge Structures over the Galway to Dublin Rail line 
The demolition of overbridges no. 21, 23 and 25 and their replacement with new bridge structures. Bridges 21 and 25 will be of precast prestressed concrete composite construction with reinforced concrete abutments. Bridge 23 will be a steel structure.Traffic flows around the project had to be maintained at all times which resulted in complicated traffic management arrangements and only allowing one bridge to be under construction at one time. The esisting bridges that were demolished had existing services withinthem that had to be diverted and switched off in advance of demolition. All bridges were demolished during nightime posessions in the space of 8 hours each.

Coffey construction had an involvement in the Design and construct of the following bridges on the contract.

OB23 - Bridge

Single span, Pedestrian Footbridge with ramped approaches, 35m length and 3.0m height. Constructed with Structural steel bridge and  Reinforce Earth Walls.

A road closure was in place on Elmhall road. The existing OB was demolished and excavation to formation level for reinforced earth structure. The construction of reinforced earth structure was carried out followed by the construction of reinforced concrete bank seats. The steel bridge structure was installed during a night possession using a 200 ton crane. Construction of northside pedestrian ramp and stairs and the construction of stone walls on the southside embankment.Installation of public lighting and bollards.All approaches to the bridge was kerbed and Tar-mac surfacing to the ramps.

OB24(a) - Bridge

Double span, Roofed Pedestrian Footbridge with 3 No. integrated Lifts and Stair access, 35 length and 3.0m height. Constructed with Structural steel bridge.

Groundwork’s; excavation to formation, temporary track protection, blinding, foundations, concrete columns, and lifts shafts. CCL also carried out the brick work on all three lift shafts.  Fabrication of the bridge and columns and stair cases was carried out by a subbie and all the steelwork was prior to arrival onsite in accordance with specification. As much cladding of the roof was carried out on site prior to the erection of the bridge.

The erecting the structure, chemically anchoring the holding down bolts into the concrete bases for the columns, was carried out during the night time under a possession. The steel walkway was installed during a night time possession along with the completion of the cladding of the roof and the installation of a fall arrest system. Application of the anti slip surfacing to the landings and carying out of any remedial works to the paint on the bridge. Installation of the gutters and downpipe.

OB25 - Bridge

The works carried out on OB25 are as follows:

Double span, two lane Road bridge, 35m length and 11.0m height. Constructed with precast concrete bridge beams and  Reinforce Earth Walls,

The construction of the reinforced earth structure was carried out followed by the construction of thee reinforced concrete bank seat. The Pre-cast concrete beams were delivered to site and installed using a 150 ton crane during a night time possession. Steel reinforcement was installed to the deck and the over-end abutments. Shutters were erected and concrete deck poured in sequence.  Pre-cast H4A parapets were lifted into place, temporarily supported, and in-situ stitch was poured. Corner piers were steelfixed, shuttered and poured. Water-proofing was then carried out by Ecoflex Ltd.

Kerbing was laid along both East and West sides of road on bridge. ESB and Eircom ducting was then installed in the footpaths along the bridge and concrete surround was applied to same. Bituminous surfacing was carried out along with installation of Honel Drainage.

OB 21 - Bridge

There was contractor design in OB21 but only for the crash barrier and foundation of the bridge structure
The works carried for Over bridge 21 (OB21) were as follows;

Single span, two lane Road bridge, with a 27m length and 9.0m height. constructed with reinforced concrete and  Reinforce Earth Walls

Demolition of original OB21 – This work was carried out under a single night possession of the railway and excavation was carried out to formation level. The embankments were then filled and construction of over bridge commenced – cast foundation, cast abutment walls, land beams, pour deck, install parapets, cast over end abutment, cast piers, water proof deck, reinforced earth walls, cast H4a barrier, install kerbs, install footpaths,  install N2BW2 barrier, install public lighting, asphaltic plug, surfacing, road marking.   

Additional Works

The provision of an upgraded and extended train stations at Hazelhatch. The station will involve the construction of new platforms including island platforms and a pedestrian bridge which will span over the railway line.

  • The installation and commissioning of lighting, electrical, and water cables, ducts and pipes.
  • The construction of retaining wall structures along the railway corridor, some of which form a boundary to the rear of existing residential houses.
  • The construction of earthwork embankments and undertaking earthworks cuttings to widen the rail corridor.
  • Site clearance of existing scrub, bushes and falling of mature trees.
  • Landscaping along the railway embankments and cuttings including the planting of trees, scrubs and grass.
  • The construction of track side maintenance roads running parallel to the route with access points off public roads.
  • The installation of new boundary treatment works along the railway corridor. 
  • The installation of a new track drainage system, both open drain and closed pipe. 
  • The extension of existing underbridges and culverts running under the existing railway line. 
  •  The construction of a new roundabout and road along Hazelhatch link road.The construction of precast concrete and in-situ concrete retaining walls, box culverts and an in-situ river bridge (Shinkin River) associated with Hazelhatch link road.
Coffey Group, Athenry, Co. Galway, Ireland Tel: +353 91 844356 Fax: +353 91 844519 Email: