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Ramp BRamp B is the name given to the existing bridge / concrete slab structure under Karangahape Road bridge. A portion of this slab was unused except for construction activities. This structure is being modified as part of the new CMJ scheme and will carry the new links from the Port and Northwestern to the Northern Motorway.
Beresford St Viaduct (Structure No. 2)The Beresford Street Viaduct (Structure No. 2) is the new Viaduct structure being constructed north of Karangahape Rd parallel to the Northern Motorway along the motorway embankment above Beresford St in Freeman's Bay. This structure will carry the Port and Northwestern to Northern Motorway traffic.
Nelson St off-ramp (Structure No. 1)The new Nelson Street off-ramp Viaduct which exits the Southern Motorway northbound on the left hand side, replaced the right hand exit to Nelson St in December 2005.
Hobson St on-ramp to the Southern MotorwayThe existing Hobson Street on-ramp to the Southern Motorway merges with the existing two southbound lanes. As part of the new CMJ scheme, traffic from Hobson Street will join in a new additional dedicated lane on the Southern Motorway extending past the Symonds St bridge. In March 2004, the Mangere pre-cast yard was established to produce pre-cast concrete beams, panels and safety barriers for the Central Motorway Junction (CMJ) Stage 2 project. In December 2004 an additional lane, from the Hobson Street on-ramp along the Southern Motorway southbound to Symonds Street on-ramp was opened. Provision of another lane in this restricted space means that traffic heading south from the North Shore on the Southern Motorway must travel closer to the existing Karangahape Road bridge piers. To protect these piers from accidental damage by vehicles, substantial concrete panels have been produced and installed.
Newton No. 2 Bridge (Structure No. 5)Newton No. 2 Bridge (Structure No. 5) is a new structure that will carry the Northern Motorway to Port traffic over the Northwestern Motorway links to the Southern Motorway and Port.
Nelson Street off-ramp from the Northwestern MotorwayThe realigned Nelson St off-ramp from the Northwestern Motorway opened on 4 July 2005. It now exits on the left hand side, replacing the previous right hand exit.
The realigned Southern Motorway to Nelson St linkThe realigned Southern Motorway to Nelson St Link now travels on the new Nelson St off-ramp Viaducts (Structure 1) see-above. Completed December 2005. Newton No. 3 Viaduct (Structure No. 4)The Newton No. 3 Viaduct (Structure No. 4) is the new viaduct structure being constructed to the south of Ramp B. This structure will carry the new Port to Northern Motorway link over the Northwestern Motorway to the Southern Motorway / Port links, and over the Hobson Street to Northwestern Motorway link, and up onto Ramp B.
The new Port to Northern Motorway linkThe new Port to Northern Motorway link will travel on the new Newton No. 2 Bridge (Structure No. 5), the existing Ramp B structure and the new Beresford St Viaduct (Structure No. 2) - see above. Completion date late 2006.
The new Northern to Northwestern Motorway linkThe new Northern to Northwestern Motorway link will join the Northwestern Motorway by following the existing alignment of the Hobson Street to Northwestern Motorway link, where it travels beneath Karangahape Road and Ramp B. The new alignment of the Hobson Street to Northwestern Motorway link will follow the existing alignment of the Northwestern Motorway to Nelson Street link. Traffic on this link will be relocated (see existing Nelson Street off-ramp from the Northwestern Motorway link above). Completion date November 2006. The new Northwestern to Northen Motorway linkThe new Northwestern to Northern Motorway link, exiting the Northwestern Motorway on the left hand side, will travel over the existing Ramp B structure, under Karangahape Road, and onto the new Beresford Street Viaduct (Structure No. 2) - see above. Completion date late 2006.
The new Northern Motorway to Port linkThe new Northern Motorway to Port link will travel on the new Newton No. 2 Bridge (Structure No. 5) - see above. Completion December 2006. Realignment of Retaining Wall 2GWork began in mid 2004 on realigning an existing retaining wall on the Port to Northwestern Motorway link under the Upper Queen Street Bridge. The realignment is to provide better sight stopping distances on the curve and to accommodate changes to the Port to Northwestern (SH16) carriageway. Realigning the the existing retaining wall wall provided a significant challenge. The existing Port to Northwestern Motorway link adjacent to the retaining wall meant the access was difficult and the works were further complicated by the close proximity of the Southern Motorway (SH1) northbound carriageway above the wall. The solution has been to build the wall in stages from the top down. A section about 1.5 meters deep was cut down and a bench formed. Soil nails were then drilled into the exposed face and grouted into place. Mesh was placed and shortcreted to provide stability before the next bench was excavated below. This sequence was repeated several times until the newly aligned wall was cut down to the level of the existing wall. Retaining wall 2G Dimensions: Length 160 meters and maximum height 8.5 meters.
The exposed faces of the two retaining walls on the Northwestern to Northern Motorway link have decorative panels that reflect a sense of place and history within Auckland. Urban design has been undertaken, in conjunction with local iwi, to enhance the motorway environment. The wall facing the Northwestern Motorway will have a wave motif recalling the streams teeming with eels that once flowed there. The wall to the north of the Beresford Street Viaduct in Freemans Bay will have a stylized pohutukawa flower and leaf pattern. On completion of construction and landscaping, pohutukawa trees will be the dominant species among the native flora planted in that area. In addition to decorative panels on retaining walls, there is now urban design enhancement to an existing bridge. Edge barriers on the Newton No.1 bridge, which carries SH1 traffic northbound have been upgraded and have a kowhaiwhai pattern which references traditional Maori wood carving forms and patterns that represent the containment and communication of knowledge and power. The barriers on new bridges have on their outside face a ta moko pattern alternating with karaka tree leaves and berries. This design reflects the significance to the iwi who lived in the area of a sacred grove of karaka trees which once stood at the heart of the CMJ area in Newton Gully.
The karaka leaves and berries and the ta moko design may remind people who enter this area that for more than a thousand years this area has been appreciated for its fertile soils, abundant kai moana and strategic position. Port to Northwestern MotorwayThe existing carriageway has been realigned after completion of retaining wall 2G. August 2005. Northern Tie-in600metres of retaining walls are under construction in the area of SH1 southbound between Cook Street off-ramp and Hobson Street on-ramp. Four of these retaining walls and the two walls for the 200m long cross-over bridge are required to enable the excavation of the Southern Motorway southbound. Four more retaining walls are required in the embankment beside Union Street, to provide the new exit lane. SH1 southbound traffic was shifted onto a temporary alignment behind the new walls in November 2005, while the existing southbound carriageway was excavated and a new carriageway constructed 4m lower than previously. The lowered carriageway provides headroom for the cross-over bridge which will carry traffic to the Port and Northwestern links. Traffic was shifted onto the new southbound alignment, under the bridge in September 2006. As well as the retaining walls being constructed, three existing structures (Wellington Street Bridge, SH1 to Nelson Street off-ramp and Hobson street on-ramp to the Northwestern Motorway) need to be underpinned to allow the Southern Motorway southbound to be reduced in level directly adjacent to the existing foundations.
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CMJ - STAGE 2 Activities
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