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.
Orthotropic Steel Decks (OSDs)
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.
India’s Longest Sea Bridge
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 project consists of sea crossing section of around 16.5 km and land section of remaining 5.5 km.
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
04 January 2022: Launch of first OSD for MTHL
09 May 2023: Launch of last OSD for MTHL
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.
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.
An appeal from Swarajya
At Swarajya, we rely on our readers' support through subscriptions to sustain our media platform. Unlike larger conglomerates, we are unable to relentlessly chase advertising money — our model is largely built on your patronage.
Your support has never been more crucial. We work tirelessly to deliver 10-15 high-quality articles daily, ensuring you receive insightful content from 7 AM to 10 PM.
If you believe India's story has to be articulated in a way it has never been done before without shrugging it off, become a patron (or) subscribe now for ₹̶2̶4̶0̶0̶ ₹1999 and get 12 print issues, unlimited digital access for 1 year, a special India that is Bharat T-shirt (Offer ends soon).
We are counting on you!