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Giant concrete structures cross Nagpur during the early morning, revealing a rarely seen stage of metro expansion, marked by special transport, heavy cranes, and precise assembly at a future elevated station.
Precast pieces of 120 tons each have begun to be transported and installed by MahaMetro in the construction of the Hingna Mount View station in Nagpur, India, as part of the Reach-3A corridor works, which will connect Lokmanya Nagar to Hingna.
The operation involves large concrete structures, nighttime displacement over long distances, and the use of heavy cranes for station assembly.
According to information published by the Times of India, each arm weighs almost the equivalent of three empty Boeing 737s and travels about 52 kilometers to the installation point.
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68 barges dumped 80,000 tons of concrete from a demolished bridge into the Atlantic to transform giant debris into eight artificial reefs, repurposing heavy construction waste and giving a second underwater life to a structure that would have ended up discarded.
The work is part of the expansion of the Nagpur Metro’s Aqua Line.
In the Reach-3A section, approximately 6.4 kilometers, seven stations are expected to receive this type of structural component.
In total, the plan is to install 140 pier arms, with 20 units per station.
How the 120-ton pieces are installed
The assembly of the precast arms follows a planned sequence of transport, lifting, and fastening.
Upon arrival at the site, each piece is lifted with an 800 metric ton crane and positioned on both sides of the station’s central pillar.
These structures will support key areas of the future stop, such as the concourse level, intended for passenger circulation, and the platform level.
In each station, ten pieces will be used on one level and another ten on the other.
After positioning, the arms are connected by linking concrete and post-tensioning methods.
The technique uses tensioned cables or strands to reinforce the structural assembly and distribute loads appropriately, according to the engineering parameters adopted in the project.
Why the project uses precast arms
The use of precast pier arms was planned to reduce prolonged interventions on urban roads and accelerate construction stages.
Instead of executing large structures directly at the station site, MahaMetro produces the components in its own yard and transports the ready pieces to the assembly section.
In the Hingna corridor, the arms are manufactured in the Khairi concreting yard.
Each unit goes through a cycle of about seven days, which includes assembling the steel frame, installing the post-tensioning ducts, concreting, and removing the forms.
The adoption of this method shifts part of the work to the logistics stage.
A piece weighing 120 tons requires special trailers, a defined route, speed control, operational escort, and transport windows compatible with the city’s flow.
The 52-kilometer journey to the station
After manufacturing, the pieces are loaded onto super heavy-duty trailers, coupled to traction vehicles.
The movement occurs mainly along the Outer Ring Road corridor, with a maximum reported speed of about 10 km/h.
Low-speed circulation allows for greater load control in curves, intersections, and urban stretches.
Due to the weight and dimensions of the structures, maneuvers depend on prior planning and coordination between the teams involved.
A large part of the transport, hoisting, and installation operations is carried out at night.
According to the original report, the measure seeks to reduce traffic interference and limit the impact on drivers, residents, and services using the roads during the day.
The start of assembly at Hingna Mount View
The first hoisting began at the end of a Saturday night and continued until the next morning at the future Hingna Mount View station.
The operation marked one of the assembly stages of the metro expansion towards residential areas, educational institutions, and health units.
The Reach-3A corridor also includes a special structure over the Vena River.
The project foresees a span of 120 meters, within the elevated section built to cross the watercourse.
In elevated metro works, this type of structure needs to consider its own weight, vibration caused by train circulation, wind action, temperature variations, and support stability.
These factors are part of the calculations and technical verifications carried out in projects of this magnitude.
The role of the corridor in metro expansion
The extension between Lokmanya Nagar and Hingna is part of Phase 2 of the Nagpur metro.
The route was planned to expand the network’s reach in areas with a concentration of educational institutions, hospitals, residential neighborhoods, and daily commutes.
According to the released data, about half of the viaduct work in the corridor had already been completed.
The informed target for the completion of civil works is December 2027, a deadline subject to the progress of construction fronts, technical stages, and the project’s operational conditions.
The installation of pier arms shows a stage prior to the circulation of trains.
Before commercial operation, tons of concrete need to be manufactured, transported, aligned, and connected to form the structure of the stations.
In the case of Hingna, each installed piece represents part of the physical base that will support the future metro stop.
The sequence involves manufacturing in the yard, controlled movement, nighttime hoisting, and structural joining on site.
The work also highlights how urban transport projects depend on processes that are not always visible to passengers.
Between the planning of the line and the opening of a station, there are engineering, logistics, and civil execution stages that define the pace of expansion.
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