Maharashtra Samruddhi Mahamarg Pkg 14

The Nagpur Mumbai Super Communication Expressway Package 14 comprises a Broad Twin Tunnel, which at 7.78kms is Maharashta’s longest and widest such structure. It is India’s third longest tunnel after Chenani-Nashri Road Tunnel and Atal Tunnel (constructed by Strabag-Afcons JV).

Main Tunnel: 7.78km
Width: 17.6m
Height: 9.12m
Length of LHS tube: 7.780km
Length of RHS tube: 7.74km

Cut & Cover Tunnel: 0.24km
Shade Tunnel: 0.2km

Total length of the tunnel structure: 8.22km

Cross passages/ Tunnels: 26 (each 44.16m long)
No of lanes: 3 (each 3.75m wide with 3m paved shoulder)
Distance: Every 300m
Length: 45m
Finished width: 7.65m
Finished height: 6.6m

Lay-Byes: 10 (in LHS and RHS)
Distance: Every 750m

Vertical shaft: 7m dia
Depth: 70m

Inclined shaft
Length: 504m
Finished width: 9m
Finished height: 8.5m

View the project animation in Xtreme Engineering story