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 > Zhengzhou Metro breakthrough

Zhengzhou Metro breakthrough

Tris Thomas

Written by Tris Thomas on 16/12/2011 in News

Tagged:

Zhengzhou, China is one step closer to becoming a national crossroads for rail traffic with the recent breakthrough of two EPBMs on its Metro Line 1. The 6.3m Robbins TBMs have set a Chinese EPB record in the process, excavating up to 720m in one month. The machines holed through in October and November 2011, two weeks ahead of schedule.

“The performance of the two machines was perfect, and the project owner has praised our excavation,” said Mr. Zhao Donghua, Project Manager for contractor CRCC Bureau 11.  The 11th Bureau and project owner Zhengzhou Metro Company held a grand ceremony for the final EPB breakthrough on November 16. The parallel 3.6km tunnels are widely regarded as the most difficult section of the metro, with low cover of 7m in a section of permeable, water-bearing soils below Xiliu Lake.

The EPBMs were launched in November and December 2010, and achieved two intermediate breakthroughs into cut and cover station sites between Tongpai Road and Kaixuan Road station along the way. Ground for much of the tunnelling was under approximately 8m of cover in soft and powdery soils, and below building foundations and a highway interchange.

Daily advance rates as high as 23 rings (34.5m) were achieved despite these challenges, including special measures below Xiliu Lake. Crews carefully maintained earth pressures of between 1.1 and 1.3 bar while boring at a low cutterhead speed of 1 RPM below the lake, reducing advance rates in this section. Settlement levels remained within limits during the entire drive.

CRCC Bureau 11 already has new projects lined up for the machines, which have been removed from the station sites. “We will utilize one EPB at the Beijing Metro project, the other machine will stay in Zhengzhou for future metro contracts,” said Mr. Donghua.

Zhengzhou, a city of 7 million people, is planned to become a center for rail commerce in China.  Up to four metro lines will be built in Zhengzhou, while freight lines traveling between Beijing and Guangzhou (North-South), and between Xuzhou and Lanzhou (East-West), will eventually intersect in the city. Once complete in 2013, Line 1 of Zhengzhou Metro will include 26km of tunnel and 22 stations.

Comments:

Leave a Reply Cancel reply

Your email address will not be published.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

Search

Digital Edition

More Like This

22/11/2022

CREG TBM breaks through on phosphate mine inclined shaft

CREG TBM breaks through on phosphate mine inclined shaft

A 5.48m diameter CREC R277 hard rock TBM developed by China Railway Engineering Equipment Group Co., Ltd. (CREG) has completed…

11/08/2022

Ministerial endorsement for Suburban Rail Loop (SRL) East

Ministerial endorsement for Suburban Rail Loop (SRL) East

The first stage of Victoria’s biggest ever infrastructure project – Suburban Rail Loop (SRL) East – is a significant step…

08/09/2022

Boring begins on London’s Silvertown Tunnel

Boring begins on London’s Silvertown Tunnel

Tunnelling of the new river crossing at Silvertown is now underway, Transport for London (TfL) and Riverlinx have confirmed. 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