Tunnelling begins on Auckland Central Interceptor

摘要

NEW ZEALAND -A Herrenknecht micro tunnel boring machine (MTBM) recently installed the first 3m-long section of concrete pipe on a new branch sewer to kick off the excavation of the 14.7km Watercare Central Interceptor Tunnel (CIT) in Auckland, New Zealand. The US$862m CIT will be the longest wastewater tunnel in the country and extend from Grey Lynn to the Mangere Wastewater Treatment Plant. It will have two branch connections (link sewers B and C). In May, a 12m-long refurbished MTBM - called Domenica - was lowered in sections down a 55m-deep launch shaft at the May Road, Mount Roskill site. It started to bore link sewer C and pipejacked the first section of 2.1m-diameter pipe on 4 June. Over the next four months, the machine is expected to operate 24/6, advancing around 18m/day and laying a further 328 pipe sections, ending its drive at the Miranda Reserve in Avondale and thus completing the 1km link sewer C. It will then be used to dig link sewer B that will extend l.5km from near the Mt Albert War memorial to the Orakei sewer main.