Home > News > Nation
Thursday January 9, 2014 MYT 9:34:00 PM
Thursday January 9, 2014 MYT 9:48:47 PM
by meng yew choong
Engineers wave flags after the TBM broke through the wall of the Pasar Rakyat MRT station. - EPA/AHMAD YUSNI
KUALA LUMPUR: The world’s first variable density tunnel boring machine (TBM) broke through the wall of the Pasar Rakyat MRT station here, heralding an important milestone in tunnel construction in the country.
The TBM, named Cochrane 2 (after the Cochrane station where it began its journey), was specially designed to tackle underground karst (limestone) that can be found at many places in Kuala Lumpur.
Known as extreme karst, this type of limestone profile is full of cavities, formed after long periods of weathering.
The last time a TBM passed through karstic terrain was during the construction of the stormwater management and roadway tunnel (SMART) that began in November 2003, where several complications arose.
A variable density machine can vary the density and viscosity of the slurry to counter unfavourable conditions.
Cochrane 2 emerged after travelling 1km, starting from the Cochrane station on July 22 last year, progressing at an average rate of around 11m a day.
Mass Rapid Transit Corporation Sdn Bhd acting CEO Haris Fadzilah Hasan said the breakthrough was a significant achievement for the underground portion of the Sungai Buloh-Kajang Line, which is slightly more than 50% complete.
Tags / Keywords:
Construction, Variable density tunnel boring machine, MRT
Bangladeshi worker dies after bricks fall from crane at construction site
Idris Jala: Azmi should not be charged with sedition
Malaysian Bar: Govt should not be exempted from CIPAA
Najib: Govt to offer rent-to-own schemes for PR1MA housebuyers without bank loans
30-year rent-to-own plan for those who cannot get bank loans
Hisham: Secession will expose Sabah to IS threats
Selangor MB crisis: Accept Sultan's choice, Dr M says
Selangor MB crisis: Azmin expected to be named MB, says source
Selangor MB crisis: Azmin says has full PKR backing
Khalid Ibrahim: I will continue to serve as MP
Anwar loses economic advisor job
Jackie Chan, Indonesia's tourism ambassador!
Docs urge action to stop young drivers’ texting
Local musician Danny One represents Malaysia music awards
Copyright © 1995-2014 Star Publications (M) Bhd (Co No 10894-D)