The first milestone of the R690-million Koeberg interchange upgrade project is expected to be com- pleted by the end of April and in time for the soccer World Cup kick-off.
The core of the Koeberg interchange project, which is being undertaken by a joint venture between Group Five and Power Construction, is the construction of linking ramps to provide a free flow of traffic between the N1 and the M5 highways.
The project is being under- taken on behalf of the provincial government of the Western Cape, which owns the N1 from Salt river to the R300 (including the Koeberg interchange).
Speaking to Engineering News, project manager for the Koeberg iInterchange upgrading: phase 1 contract John Colman elaborates that the project is on time and within budget.
“The current contract had a commencement date of April 23, 2008, and a project duration of 42 months, with the final completion date scheduled for November 23, 2011,” continues Colman.
“However, the first milestone date has been set for April 23 this year.”
Colman states that the works that are due to be completed by the first milestone date include the realignment of the Salt river canal by 15 m to the west of the M5, all new N1 road widenings, and the elevated ramp A over the existing Koeberg interchange travelling from the N1 highway onto the M5 southbound.
The first milestone also includes the installation, removal, replace- ment and relocation of all affected underground water, sewer, stormwater, Telkom and City of Cape Town electrical services.
The balance of the construction work, namely the elevated ramp B over the existing Koeberg inter- change, travelling from the M5 viaduct northbound onto the N1 highway heading to Paarl, and the widening of the M5 viaduct is scheduled to be completed by November 23, 2011.
“All scheduled completion dates are on programme,” states Colman.
He adds that the most significant challenges to date have been dealing with the existing known and unknown services below ground, accommodation of traffic and the transport and launching of precast U-beams each weighing up to 84 t to support the deck slabs.
Although the Koeberg inter-change project has been divided into further phases, this project is the first and only phase under construction at present.
The next phase of the project includes the implementation of the N1 bus rapid transit scheme, which will use the area of the disused Paarden Eiland railway line.
The adjoining project, the upgrading of Table Bay boulevard will include widening the south-bound carriageway of the N1 through the Koeberg interchange from two to three lanes, the building of an extra traffic lane on the southbound carriage- way of Table Bay boulevard between the Koeberg interchange and the Marine drive interchange, the building of a walkway deck and pedestrian paths, and the widening of the bridge carrying Table Bay boulevard over the disused Paarden Eiland railway line. This project is, likewise, scheduled to be completed for the World Cup and is on schedule.
The projects have been necessitated by the significant traffic congestion experienced at the Koeberg interchange, where the N1 and M5 highways intersect.