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
    • Products Page
    • Media Kit
  • Conferences
    • BTS Conference and Exhibition
    • Cutting Edge 2021
  • Buyer’s Guide
  • Events Diary
  • Jobs
  • About Us
  • Contact Us
  • Podcast

Home > STP successfully lowers Bertha into the access pit

STP successfully lowers Bertha into the access pit

Gary

Written by Gary on 24/08/2015 in News

Tagged:

Seattle Tunnel Partners and crane crews from Mammoet have successfully lowered the 2,000-ton front end of the SR 99 tunneling machine to a platform at the bottom of the access pit.

Crews will now use the crane to fine-tune the position of the piece. When that process is complete, they will begin reconnecting the piece to the portion of the machine that remains in the ground.

The effort to return the tunneling machine’s front end to the 120-foot-deep access pit began early Monday morning. Crews started by vertically lifting the piece, which includes the machine’s cutterhead, motors and the new main bearing assembly. The crane then moved horizontally on its rails to the north. When the piece was above the pit, crews rotated it to a semi-vertical position and lowered it partway into the pit before breaking for the evening. Work resumed early Tuesday morning, with the piece reaching the bottom of the pit Tuesday afternoon.

Three pieces of the machine’s shield that remain at the surface will be lowered and reinstalled in the coming days STP’s latest schedule After the machine has been reassembled, STP and manufacturer Hitachi Zosen will conduct a series of tests will follow reassembly to ensure the machine is ready to resume mining.

The effort to return Bertha to the 120-foot-deep access pit began early Monday morning. Crews started by vertically lifting the piece, which includes the machine’s cutterhead, motors and the new main bearing assembly. The crane then moved horizontally on its rails to the north. When the piece was above the pit, crews rotated it to a semi-vertical position and then lowered it partway into the pit before breaking for the evening.

Comments:

Leave a Reply Cancel reply

Your email address will not be published.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

Search

Digital Edition

More Like This

08/12/2020

Melbourne Suburban Rail Loop EOI launched

Melbourne Suburban Rail Loop EOI launched

The Andrews Labor Government in Victoria, Australia, has opened Expressions of Interest for the biggest ever Initial and Early Works…

18/11/2020

Traylor-Shea Joint Venture awarded RiverRenew Tunnel System Project

Traylor-Shea Joint Venture awarded RiverRenew Tunnel System Project

At its regularly scheduled Board of Directors meeting on Tuesday, November 17, the Alexandria Renew Enterprises (AlexRenew) Board awarded a…

12/11/2020

Good progress reported on the Lesotho Highlands Water Project

Good progress reported on the Lesotho Highlands Water Project

The Lesotho Highlands Development Authority (LHDA) has reported underground tunnelling works inside the two Polihali Diversion Tunnels is progressing well…

  • 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