Infrastructure
Mumbai Infra Watch: Last Orthotropic Steel Deck Erected On Trans Harbour Link, Overall Project Progress At 93 Per cent
- The bridge, when completed, would be the longest sea bridge in India and would cater to 70,000 vehicles daily.
Launch of the longest steel deck as part of Mumbai Trans-Harbour Link project (MMRDA)
The under-construction Mumbai Trans Harbour Link (MTHL) crossed another milestone on 9 May after engineers completed the task of launching the last orthotropic steel decks (OSDs) on supporting piers.
The overall progress on the project is now 93 per cent, with the authorities targeting December 2023 opening.
The OSD, a steel deck superstructure being used for the first time in the country, will carry the vehicular load more efficiently and improve the load carrying capacity of the bridge, as compared to a concrete superstructure.
OSD bridge has lesser self-weight but stronger structure than concrete or composite girder bridges, which requires fewer and smaller piers.
OSD contributes to shorter construction period and mitigation of safety-risks at the project site since it is manufactured in a factory and requires lesser on-site work. Moreover, fewer and smaller piers and shorter construction period mean less impact on environment and ecosystem.
Financed by Japan International Cooperation Agency (JICA), MTHL Bridge is an under-construction 22-km-long six-lane marine road bridge implemented by the Mumbai Metropolitan Region Development Authority (MMRDA).
The link has interchanges at Sewri in Central Mumbai, Shivaji Nagar at Mumbai Bay and NH-4 B at Chirle, Navi Mumbai.
Popularly known as the Sewri Nhava Sheva Harbour Link, the sea link connects Sewri in Mumbai to Chirle in Navi Mumbai, thereby, reducing the travel time between South Mumbai and Navi Mumbai to just 20 minutes from the present two hours.
The mega project is expected to mitigate traffic congestion in the island city and promote economic development in Navi Mumbai and greater economic integration of Mumbai, Navi Mumbai, and their extended regions such as Pune, Goa, Panvel and Alibaug.
At a Glance
70 number of OSDs in MTHL
84,000 tonnes: Cumulative weight of all 70 OSDs
8.8 km: Total length of OSDs used in MTHL
180-metre: Longest OSD launched on the MTHL, giving a navigation space of 180 metres to ships traversing under the bridge without obstruction
09 May 2023: Launch of last OSD for MTHL
Four Packages
The MTHL bridge has been split into four packages — while packages 1 and 2 are sea based, package 3 is on land.
Package-4 entails work related to installation of an intelligent transport system (ITS), toll management system, electrical works, highway illumination system, and construction of toll plazas and administrative buildings including the command control centre.
Deadline
The commencement date of three civil works packages was 23 March 2018 and the progress is 92.60 per cent in Package-1, 92.28 per cent in Package-2, and 98.09 per cent in Package-3, as of 5 March 2023.
The bridge, when completed, would be the longest sea bridge in India and would cater to 70,000 vehicles daily.
