Linear infrastructure projects demand a high accuracy level of surveys so as to achieve the planned alignment. Given the design speed of 180 kmph & alignment either on viaducts or in tunnels leaves hardly any margin of tolerance in the case of RRTS structures. The requirement of meeting tight timelines necessitates simultaneous working on multiple sites. Also, ballastless tracks for RRTS are required to be laid at an accuracy level of as low as less than 5 mm.
Considering the criticality of the accuracy of surveys required, NCRTC went beyond the technologies being used in the country like ‘DGPS’ & ‘Total Station’ and took up the challenge to innovatively use application of a surveying technology called CORS (Continuously Operating Reference Station) for the construction of structures of RRTS Project.
CORS provides real-time accurate coordinates of any point within the geographical limits of the network. The system provides the repeatable precise values of coordinates at all times, without any effect of weather. This system works with inputs from multiple satellites & eliminates human error or accumulation of error even while working from part to whole.
CORS network has been set up for the first time in the country for a rail-based project. Engineering companies working on the Delhi-Meerut RRTS project are using this technology and have lauded this path-breaking initiative. Since the full-scale technology demonstration has been done by NCRTC, doors have been opened for other projects and organization to confidently use the technology for their specific applications. We at NCRTC are also supporting a couple of other high-speed/similar projects in procurement & customizing this survey technology.
This article first published on LinkedIn Pulse.