Now Reading: Anna Salai flyover redesign due to metro station misalignment
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Anna Salai flyover redesign due to metro station misalignment
The design of the four-lane flyover under construction on Anna Salai in Chennai has been altered at two points where it crosses underground metro stations, after the original alignment did not match…
The design of the four-lane flyover under construction on Anna Salai in Chennai has been altered at two points where it crosses underground metro stations, after the original alignment did not match the station locations. Instead of the planned three columns with one in the centre, engineers have shifted to two columns on either side at those stretches, saving carriageway space.
The Rs 612 crore project, which began in January 2024, slowed down only at the station points covering a combined 426 metres. State government approval has been obtained for the design change, and there will be no additional cost, according to a Highways department engineer. The deviation is within the allowed 10% scope change in infrastructure projects, at about 7.2%.
Work has been ongoing despite challenges such as gas supply disruptions affecting welding. So far, 62% of the project is complete. Utility services including power cables, water mains and telecom lines have been shifted at 50 foundation locations. The flyover is expected to be completed by February 2027.
Indian Opinion Analysis
The Anna Salai flyover runs above Chennai Metro's underground corridor, where diaphragm walls were designed a decade ago to bear its load. The misalignment suggests coordination gaps between the highways department and Chennai Metrorail during the planning phase. Under the standard 10% scope-change clause in state infrastructure contracts, the redesign does not trigger fresh approvals or cost overruns. IIT Madras, conducting third-party audits, will verify the structural soundness of the two-column spans. The February 2027 deadline remains the key milestone to watch.
The Anna Salai flyover runs above Chennai Metro's underground corridor, where diaphragm walls were designed a decade ago to bear its load. The misalignment suggests coordination gaps between the highways department and Chennai Metrorail during the planning phase. Under the standard 10% scope-change clause in state infrastructure contracts, the redesign does not trigger fresh approvals or cost overruns.
Source: thehindu.com
This brief was synthesised by AI from the source linked above.
