Downtown MRT line Project, Stage 2
Rochor and Little India MRT Station Contract 921 (LTA Contract 9161F)
Rochor station was first announced as part of Downtown line Stage 2 (DTL2) in 2008. Contract 921 for the design and construction of Rochor station, Little India station and tunnels was awarded to SsangYong Engineering & Construction Co. Ltd.
This contract was quite challenging as there were 10 lane road and Rochor Canal on the ground above, as well as existing North-East Line that was only 5 meters above the construction site. A 167 meters long box shaped tunnel structure had to be placed before a main construction even began. Every type of subway construction methods, including NATM, TBM, Open-Cut, had been used to construct this short stretch of extension, and the roads above had to be detoured more than 50 times to ensure that there was no inconveniencing the traffic.
Hundreds of Encardio-rite’s sensors were used in the project, for the safety monitoring during the construction works. The instrumentation included 260 numbers of piezometers, 790 numbers of arc weldable strain gauges, 25 numbers of tilt meters and 12 numbers of crack meters were used in the project. All sensors (100%) have operated satisfactorily.