With the National Highways Authority of India (NHAI) expected to shortly finalise the Detailed Project Report (DPR) for the elevated highway on the 17-km-long Aroor-Edappally NH 66 Bypass corridor, Kochi Metro Rail Limited (KMRL), which is constructing the Kochi Metro viaduct for the project’s phase-two extension to Kakkanad, has submitted pertinent details of the proposed viaduct at Palarivattom Bypass Junction to the NHAI, to ensure that the alignments of both projects, which would criss-cross at the junction, do not clash.
The NHAI had in March directed the Bhopal-based consultancy firm preparing the DPR for the elevated highway to revise the contents of the report after taking into account the vertical and horizontal clearances for the metro viaduct that has been proposed over the existing four-lane flyover at Palarivattom Bypass Junction.
“The firm is exploring ways to finalise an optimal alignment for the six-lane elevated highway at Palarivattom, after taking into account the design of the alignment for the metro viaduct. The NHAI has forwarded the details submitted by KMRL to the DPR consultancy firm,” official sources said.
As per the NHAI’s tentative plan, a pair of three-lane highways is to be built on either side of the four-lane flyover at Palarivattom and on either side of the six-lane flyovers at Vyttila and Kundannoor. This plan would be finalised based on the DPR, it is learnt. Currently, piling is underway on either side of the Palarivattom junction as part of constructing the 11.20-km viaduct for the metro’s Kakkanad extension.
Sources in KMRL said they have handed over to NHAI the general arrangement drawing for the 60-metre-long span of the metro viaduct that would be built perpendicular to the NH Bypass, over the Palarivattom flyover.
“The span would be an open-web girder/truss structure and would hover 14 metres above the road surface. It would be built 5.50 metres above the existing flyover and the proposed elevated highway, while the pile caps for the span would be located beyond the Right of Way (ROW) of the NHAI,” they said. Apart from these aspects, the metro agency has agreed to submit, in due course, details like the work programme, construction and erection methodology of the span and allied structures at the Palarivattom junction, along with their designs, they added.
Published – April 29, 2025 01:16 am IST