tunnelling-journal (1)
tunnelling-journal (1)
  • Home
  • Print
    • Subscribe
    • Tunnelling Journal
    • Breakthrough
    • ITA Activity Report
    • A&NZ Journal
    • WTC Preview
    • Media Kit
  • Digital
    • Newsletter
    • E-Shots
    • TJ Digital edition
    • Products Page
    • Media Kit
  • Conferences
    • BTS Conference and Exhibition
    • Cutting Edge 2022
  • Buyer’s Guide
  • Events Diary
  • Jobs
  • About Us
  • Contact Us
  • Podcast

Home > Sydney Metro breakthrough marks halfway completion

Sydney Metro breakthrough marks halfway completion

Tris Thomas

Written by Tris Thomas on 14/07/2019 in News

Tagged:

 

Tunnelling on Australia’s biggest public transport project, The Sydney Metro, is 50% complete after one of the project’s five Herrenknecht TBMs broke through into the new Crows Nest Station site.

Crows Nest Breakthrough

TBM Mabel’s cutterhead broke through a wall of rock at the new Crows Nest Station site after tunnelling about 3km from Chatswood.

Since launching in February this year, TBM Mabel has excavated about 290,000 tonnes of sandstone and shale.

Mabel will spend a few weeks undergoing maintenance before being re-launched at Crows Nest and tunnelling towards the next future Sydney Metro station at North Sydney.

TBM Mabel and partner machine, Wendy, are building 6.2km of twin tunnel which will link the recently opened North West Metro at Chatswood to the harbour’s edge at Blues Point. They are two of five Herrenknecht TBMs building the 15.5km, 6m i.d. twin railway tunnels between Chatswood and Marrickville. The TBMs are purpose built, with four double-shield, hard-rock TBMs designed to bore through Sydney’s hard sandstone, whilst a mixed-shield slurry TBM will excavate through the under-Sydney Harbour ground conditions.

Currently two TBMs will deliver the 6.2km from Chatswood to the edge of Sydney Harbour (Mabel and Wendy), whilst two will travel 8.1km from Marrickville to Barangaroo.

Last month, Mixshield slurry TBM, Kathleen, passed its final inspection and is ready to launch from Barangaroo to dig the historic 1km long rail crossing deep under Sydney Harbour.

After building the first tunnel, Kathleen will have her cutterhead and main section lifted out at Blues Point and placed on a barge to return to Barangaroo. The machine’s support trailers will be pulled back to Barangaroo inside the first tunnel.

Kathleen will then build the second tunnel under Sydney Harbour after that, the whole TBM will be retrieved at Blues Point and taken away by barge. The machine is expected to tunnel through clay, silt and sediment under the harbour.

Tunnelling contractor, John Holland/CPB/Ghella was awarded the $2.81bn contract in June 2017.The current schedule sees the tunnelling contract conclude in 2021.

 

Comments:

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Search

Digital Edition

More Like This

31/01/2023

EPBM assembly for Chennai Metro Rail Phase-II

EPBM assembly for Chennai Metro Rail Phase-II

Contractor, Tata Projects Ltd has celebrated the assembly of the third of five ordered 6.61m diameter Terratec EPBMs for use…

20/09/2022

World-first contract will combine relationship contracting and sustainability index

World-first contract will combine relationship contracting and sustainability index

Last week the International Tunnelling and Underground Space Association (ITA-AITES) signed an agreement with research and environmental specialist BRE and…

31/10/2022

Fifth TBM launched on HS2

Fifth TBM launched on HS2

HS2 Ltd has launched the fifth TBM, ‘Caroline’, that will be constructing tunnels for the HS2 railway through London. The…

  • Contact Us
  • Media Kit
  • Magazine Archive

Newsletter

The latest from the Tunneling Journal direct to your inbox.

Social



Enquiries

TGS Media Ltd
The Old Library
Webster House
Dudley Road
Tunbridge Wells
TN1 1LE
United Kingdom

© Tunnelling Journal. All Rights Reserved. Privacy Policy / Terms & Conditions. Admin

We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.OkRead more