Klang Valley MRT Project
The Metro system consisted of nearly 9km of twin track tunnel On one side of the town the tunnels passed through Kuala Lumpur limestone, a karstic limestone, whilst at the other end of the line the geology consisted of Kenny Hill formation, an agglomeration of mixed silts, sands, clays, and even some phyllites which varies from stiff to soft in consistency. This is ideal material for EPB tunneling.
The contractor, MMC Gamuda chose two CREG EPB machines for the drives in Kenny hill formation from Semantan portal to Pasar Seni station, passing through KL Sentral station on the way, a total distance of approx 2.8 km.
The TBMs CR50 and CR51 were delivered during early 2013 and were launched on 13 June 2013 and 12 July 2013 respectively. Progress rates up to 345 metres a month were achieved before the machines arrived at the end of the first section of the drive in January 2014.
The second drive from KL Sentral to Pasar Seni is planned for the summer of 2014.
The two TBMs have identical specifications.
|Geology||Mixed silts, sands and clays|
|Outer TBM Diameter||6.66 m|
|Length, incl. Backup||108 m|
|Cutting tools||17" Discs and picks|
|Cutterhead Power||1120 kW
|Total installed power||2074 kW|
|Torque - kNm||7000|
|High Speed - rpm||0-3.8|
|Thrust - kN||47,400|
|Best monthly rate - m||345|