Motorway construction works

Tender description

Transport Infrastructure Ireland (TII), intends to procure a civil engineering construction contractor to design and construct the Dunkettle Interchange Upgrade Scheme, comprising the upgrade of the existing interchange to a largely free flow involving, including but not limited to, the construction of a number of new structures (including over the railway); new road links including all earthworks, drainage and pavement; signage and lining; landscaping; environmental mitigation; culverts; roundabouts; pedestrian and cycle facilities; and traffic management, all in close proximity to live traffic, the railway, Cork Harbour SPA and various large industrial facilities. This procurement is for the Design and Construction of the Dunkettle Interchange Upgrade Scheme. The existing Dunkettle Interchange is located approximately 6km to the east of Cork City, where the M8/N8 road from Dublin to Cork intersects with the N25 road from Waterford to Cork, via the existing interchange, just north of the Jack Lynch Tunnel. The existing interchange comprises a signalised roundabout, which includes a free flow overpass for traffic travelling along the N25 from the east to Cork, in the west, and vice versa. Traffic using the interchange other than for this movement must negotiate the existing circulatory carriageway (roundabout) which is controlled via traffic signals. The works comprises the reconfiguration of the existing Dunkettle Interchange to a free flowing interchange in so far as practicable, i.e. an interchange whereby traffic movements are not conflicted by opposing traffic movements either by yielding or stopping at traffic signals, as is the case with the existing interchange. The works includes the following elements of infrastructure: — A series of direct road links between the N8, the N25 and the N40 and links to the R623 Regional Road in Little Island and Burys Bridge in Dunkettle, — 1 grade separated junction arrangement at the existing N25 to the east of the existing Dunkettle Interchange, — 4 roundabouts – 2 at the grade separated junction and 2 at tie ins with the existing road network, — 43 major structures of various forms including railway structures, — several culverts where the scheme crosses watercourses or intertidal areas, — utility diversions, — Associated ITS Provision; and Pedestrian and cyclist facilities. Significant traffic management will be required as the interchange will need to remain open to traffic during the Works. Various environmental mitigation is also required as per the planning consents.