Mumbai Trans Harbour Link: Longest OSD span of 180 meters successfully launched

CM Eknath Shinde at the site on Wednesday.

In an important achievement towards the completion of Mumbai Trans Harbour Link (MTHL) which will be India's longest sea bridge connecting Sewri with Nhava Sheva, the longest Orthotropic Steel Deck (OSD) span of 180 meters of MTHL was successfully launched on Wednesday in presence of Maharashtra CM Eknath Shinde and Deputy CM Devendra Fadnavis.

On Wednesday, Shinde and Fadnavis along with other ministers including Dadaji Bhuse and Sanjay Rathod visited the MTHL project. Metropolitan Commissioner SVR Srinivas along with other MMRDA officials were also present during their visit.

According to a press release issued by MMRDA, out of the 70 OSD spans, 36 OSD spans have already been installed.

"MTHL Package 2 is all ready to mark its another milestone by installing the longest OSD span of 180 meters," the press release said.

MMRDA is implementing the ambitious project in 3 packages containing civil works and 1 package containing Intelligent Transport System (ITS) and the civil work of the project is about 90 per cent completed, it said.

The Mumbai Trans Harbour Link (MTHL) is a 6-lane road bridge across the Mumbai Bay between Sewri in Mumbai and Chirle in Navi Mumbai. When completed, it would be the longest sea bridge in India.

The total bridge is of about 22 km length which comprises 16.5 km of sea bridge and 5.5 km of viaducts on land on both ends of the bridge. The link has interchanges at Sewri in Mumbai and at Shivaji Nagar with NH-4B and at Chirle, Navi Mumbai.

MTHL is divided into three construction packages for execution, of which Package-2 is awarded to Daewoo E&C and Tata Projects Ltd which comprises 7.8 km of bridge section spanning across the Mumbai Bay and Shivaji Nagar Interchange.

The MTHL Package 2 starts at chainage 10 plus 380 in the Mumbai Bay and runs up to chainage 18 plus187 at Shivaji Nagar. It includes the construction of the Shivaji Nagar Interchange with associated ramps.

Also Read: Maharashtra CM Shinde visits Dhananjay Munde at Mumbai hospital

The package is broadly divided into 3 zones- Marine which is about 4.37 km, Intertidal zone which is about 2.09 km and Land zone which is about 1.35 km.

In the land zone, there are 6 ramps which connect the bridge with the proposed CIDCO Coastal road.

"The bridge structure is mainly segmental box girder concrete decks of mostly 60m length spans in all the zones except for a navigational section which is steel deck, OSD. These spans are installed to ensure the smooth thoroughfare of the ships under them since they provide a height clearance of nearly 25 meters from the water level and hence these zones are known as the Navigational sections," the press release further said.

OSDs are fabricated in panels of 12m long in Japan, South Korea, Vietnam and Myanmar and brought to Karanja Port's assembly yard in India through sea.They are
assembled into the full-length spans, technically called as large blocks, ranging from 65m to 180m. Post the readiness of these spans, they are loaded on to the barges at Karanja Jetty and transported to the erection site.

The details of the longest OSD Span are as follows:

Span Id : MP 184 - 185 LHS
Span Length : 180 Meters
Weight Of Span : 2300 Metric Ton
Height Of Span : 7.2 Meters
Barge Dimension : 100 X 36 Meters
Weight of Barge : 1300 Metric Ton