Outline Plan of Works
4.
Description of the Mt Eden Main Works 4.1 Overview
The Mt Eden main works will be undertaken from mid-2020 through to 2024. Construction works will occur concurrently along several active work fronts within the main works area to enable the redevelopment of the Mt Eden Station and CRL tie-ins to the NAL (refer to Error! Reference source n ot found.). In summary, the main activities include: • Set up of construction support areas (described in further detail in Section 4.5 below), including establishment of Industrial and Trade Activities; • Ground improvements, in the form of deep soil mixing (contiguous piling and grout injection), within the NAL corridor between Mt Eden Road Bridge and Normanby Road; • Construction of retaining walls and bulk excavations along the NAL to provide for the rail trenches and installation of new tracks. The excavation will encounter basalt, which will be removed via rock-breaking and blasting. In places, softer ground conditions are anticipated to be encountered, which may require the use of sheet piles; • Construction of the eastern and western crossover structures that enable the CRL to tie-in to the NAL; • Construction of the Porters Avenue and Fenton Street overbridges, and the public realm reinstatement of the surrounding area; • Construction of the Normanby Road grade separation bridge, including regrading of Normanby Road and realigning the Boston Road roundabout; • Construction of the Mt Eden Station, ventilation building, CRL platform and building foundations, and redevelopment of the existing NAL platform; and • TBM operational activities, which include conveying spoil material from the tunnels, refuelling and general maintenance of the TBM. A detailed description of the main works is included in the CEMP (Appendix D) and drawings depicting the main works are provided in Appendix F.
4.2 Staging The main works are divided into several stages within the various work areas. Indicative dates and duration of the main construction activities have been provided in section 2.3 of the CEMP for each of the NAL geographical areas listed below: • East Facing Connection 1 (EFC1), i.e. Eastern tie in to Normanby Road; • East Facing Connection 2(EFC2) from Normanby Road to Mt Eden Road, including eastern cross over structure; • Mt Eden (MTN), including Mt Eden Station and Tunnels and NAL platform; and • West Facing Connection (WFC) - including western crossover structure and western NAL. WFC is divided into two areas: WFC1 (from the MTN to just before Porters Avenue) and WFC2 between Porters Avenue and the western end of the NAL. During construction, trains will utilise ‘Single Line Running’ (or SLR) when passing through Mt Eden in order to keep freight and passenger services operating on the western line while Mt Eden Station is closed. SLR will ensure enough space to safely complete construction on alternate sides of the rail corridor. Page 23
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