Infrastructure News

The Japanese bridge technology which made Atal Setu possible, ET Infra

Atal Setu (Mumbai Trans Harbour Link)

HYDERABAD: Completed in less than six years, the 22-km Mumbai Trans Harbour Link, India’s longest sea bridge and one of the complex mega infrastructure projects undertaken in the country, saw incorporation of advanced Japanese construction technology.

Japan International Cooperation Agency or JICA has been the principal financier of the project, which incorporated Orthotropic Steel Deck (OSD) technology, enabling a comparatively faster completion of the project.

“We also made quite important proposals in terms of the bridge’s design. The Indian government’s original idea was construction through simple PC (Prestressed Concrete) girder bridges. JICA proposed more advanced Japanese girder technology which is robust, resilient enough, light in terms of weight, span is long and you can reduce the number of pillars and shorten construction time,” said SAITO Mitsunori, Chief Representative, JICA India, in an interaction with ET Infra.

Mitsunori outlined that the project was initially to be undertaken in public-private partnership mode but was not successful after which JICA came in and advised the Government of India and the Maharashtra state government to undertake the project in EPC or engineering, procurement and construction mode with funding from JICA in the form of Official Development Loan and incorporating Japanese technology.

<p>Orthotropic Steel Deck</p>
Orthotropic Steel Deck

According to JICA, OSD bridges have lesser self-weight and stronger structure than concrete or composite girder bridges and require fewer and smaller piers, leading to shortening of construction time as well as less impact on environment and ecosystem.

The OSDs were manufactured by Japan’s IHI Infrastructure System, under IHI Corporation, a heavy-industry manufacturer and were assembled at the project site with maximum length of 180 metre and maximum weight around 2,600 metric tonne.

Atal Setu has reduced the travel time between South Mumbai and Navi Mumbai to 20 minutes from earlier 120 minutes and is expected to bring about several economic benefits to the broader Mumbai Metropolitan Region.

  • Published On Jan 23, 2024 at 07:11 AM IST

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