Wicklow Port Access Road
 

Name:      Wicklow Port Access & Town Relief Road Scheme
Client:    Wicklow County Council  
Consultants:  Arups Consultant Engineers
Location:  Wicklow Town, Co Wicklow
Project Value:  €33 million
Completion Date:  April 2010

Project Description:

The works involved the construction of approximate 4.5mkm long single carriageway and some short sections of single carriageway roads and two new at-grade roundabouts will be constructed. The new road involved the construction of earthworks, new pavement layers, wearing courses, drainage works, services ducts, reinforced concrete structures and other miscellaneous work. The town relief road commenced on the Marlton Road and connected with Rathnew Road.

The Port Access road commenced at the junction of the Rathnew Road and connect to the existing Murrough Road.

The contract involved the construction of a 4.5km of new single carriageway road and associated tie-ins to the existing road network. 2 no. new at-grade roundabout road junctions and 4 no. signalised at-grade road junctions and tie-ins to the existing road network. The Project involved all the construction work for the new dual carriageway project, including the following

  • Mass earthworks (including deep excavations and high fill embankments)
  • Pavement layer works and surfacing work
  • Drainage works, Kerbing works, Landscaping works
  • Footpath, cycle track and pedestrian crossings
  • Road lighting and electrical works
  • Traffic signs and road marking works
  • Safety barriers and fencing works
  • Structural concrete works
  • Environmental mitigation works
  • Traffic management works
  • Rock armour coastal protection

Structures:

  • Post Tensioned bridge spanning 134m over the Broadlough Estuary consisted of 108 No Cast Insitu Bored Piles and associated marine temporary works – Specialist Masonry for Bridge Piers was required
  • Contractor Designed Arch Unit Over the Ashtown Stream -48 m in length spanning 16.3m
  • Bridge over Rail-lie (Dublin-Rosslare Railway line)  spanning 22m consisted of insti concrete with 20 No pre cast beams
  • 61m span bridge over the Dublin-Rosslare Railway line, consisting of 32 No Bored Cast insitu Piles
    Retaining walls: 
  • The most significant retaining wall structure along the course of the road was a insitu concrete wall that was 40m in length and a height of 9m which acted as a retaining wall for an earth embankment.
  • In addition to the concrete retaining wall there were 2 large reinforced earth retaining walls which also acted as retaining wall for new embankments that had to be constructed.
  • Along the course of the roadway at several point there was the construction of various lengths and heights of concrete retaining walls.

The Project involved all the construction work for a new dual carriageway project, including the following:

  • Mass earthworks (including deep excavations and high fill embankments)
  • Pavement layer works and surfacing work
  • Drainage works, Kerbing works, Landscaping works
  • Footpath, cycle track and pedestrian crossings
  • Road lighting and electrical works
  • Traffic signs and road marking works
  • Safety barriers and fencing works
  • Structural concrete works
  • Environmental mitigation work
  • Traffic management works
  • Rock armour coastal protection

Pavement:

The works involved the construction of approximate 4.5 km long single carriageway and some short sections of single carriageway roads and two new at-grade roundabouts will be constructed. The new road involved the construction of earthworks, new pavement layers, wearing courses, drainage works, services ducts, reinforced concrete structures and other miscellaneous work. The town relief road commenced on the Marlton Road and connected with Rathnew Road.  The Port Access road commenced at the junction of the Rathnew Road and connect to the existing Murrough Road. Surfacing. The pavement concstruction was100mm of base course and 45mm of wearing course (Hot Rolled Asphalt) was laid

Earthworks:

Quantities of Excavated Materials
Bulk Excavation material
Class 5A topsoil                                        34,112 cu.m
Class 1 or 2 acceptable                   63,098 cu.m (18,000 cu.m of this in rock)
U1 unacceptable                                      61,965 cu.m

TOTAL BULK EXCAVATION                   184,775 cu.m                     
Cut & Fill Material
Total Cut Excluding topsoil                      150,663 cu.m
Total Fill                                                    255,572 cu.m

Drainage Material
Cl.503                                                       8,000 cu.m
Cl.505                                                       20,000 cu.m

Rock for road construction
6f2                                                          50,000 cu.m
Cl.804                                                    10,000 cu.m

Coastal Protection
 Rock Armour (1-3ton)                               8,000 cu.m

Imported General Fill
Class 1 or 2 acceptable fill             104,909 cu.m   

Drainage:

A combination of French drains, carrier drain, kerbs and gully, drainage channels are utilised on the project. In addition to this we are required to construct attenuation ponds and pollution control measure for the entire road network. We are also required to lay the foul rising sewer for the sewerage collection scheme in the town. New watermains were also laid along the entire rout of the project.

Services:

Services such as Eircom, ESB, Bord Gais, Chorus, Water and Sewerage had to be diverted and new services installed. This was all managed and controlled by our site staff with liaison with the relevant utilities

Specialist Engineering:

As part of the Wicklow Port Access Town Relief Road there was a requirement to provide two 1500mm diameter steel pipe sleeves underneath the Railway lines located at the Murrough which is located Northeast of Wicklow Town. One of these sleeves was to receive watermain, foulsewer, gas main and telemetry ducting in the immediate future. The other sleeve was to remain open until sometime where services may be placed in position in the future. The two sleeves would have to be 20 meters in length. After consultations between Coffey Construction, Wicklow County Council and Iarnród Éireann personnel it was decided that Pipe Ramming would be a viable solution for the installation of the sleeves. It should be noted that whilst the ramming was in progress there was independent track monitoring which occurred. Results were forwarded to Wicklow County Council and Iarnród Éireann. There was no significant settlement of the track. The maximum amount of settlement was 18mm which was within the Iarnród specification. There were no problems with the twist results.

Coffey Group, Athenry, Co. Galway, Ireland Tel: +353 91 844356 Fax: +353 91 844519 Email: info@coffeygroup.com