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 > 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Your email address will not be published.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

09/10/2022

Tunnel boring begins on Vancouver’s Broadway Subway Project

Tunnel boring begins on Vancouver’s Broadway Subway Project

Vancouver’s Broadway Subway Project has reached a critical phase of construction with the start of tunnel excavation to connect six…

17/02/2023

CRL Project Update – flooding and cyclone impacts

CRL Project Update – flooding and cyclone impacts

The City Rail Link has reported that Cyclone Gabrielle and the earlier Auckland Anniversary flooding event have left minimal lasting…

14/02/2023

Bids returned for NHSRCL 21km tunnel

Bids returned for NHSRCL 21km tunnel

India’s National High-Speed Rail Corporation Limited’s (NHSRCL) call for bids for the construction of a 21km tunnel on the Mumbai-Ahmedabad…

  • 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