Launching girder gantry cranes with span adjustment, motorised hook and hydraulic CT supplied for the construction of India’s third longest cable-stayed bridge.
The Zuari cable-stayed bridge is a part of a 12-km-long road project, which links Panaji and Madgaon in Goa. The 1225m-long bridge, built over the Zuari River, is the third longest cable-stayed bridge in India and connects North Goa and South Goa.
The project was undertaken by one of the largest construction and infrastructure majors in India. Such projects are generally carried out using large precast segments and require the use of advanced machinery for construction.
NRS Bridge Construction India Pvt. Ltd. is a subsidiary of NRS AS, Norway. Established in 1983, NRS AS is the world leader in supplying highly specialised and advanced construction equipment for bridges. Its services range from the design and supply of specialised bridge building equipment such as Form Travellers and Movable Scaffolding Systems for cast-in-situ bridges (for balanced cantilever and full span), to the much larger scale full span precast method. NRS also offers services for technical assistance and construction management on site, which cover associated assembly, commissioning, operation and maintenance of the equipment.
In the year 2016, the company was engaged for supplying the bridge building equipment for the construction of the Zuari Bridge. It has supplied Launching Girders and allied equipment for constructing the bridge.
For this project, NRS was looking for Launching Girder Gantry Cranes capable of ensuring precision handling and offering the highest safety and reliability.
The cranes mounted atop launching girders were required for lifting precast segments weighing approx. 80t over a height of about 30m and placing them precisely on the precast girders. To ensure precision and jerk-free handling of segments, additional features such as a motorised hook that could rotate through 360° and advanced hydraulics for cross traverse were required. The bridge has a few smaller radius curves and thus, its width is not uniform across the entire length and hence, a provision for adjusting the span of the cranes was essential. The NRS team was also very particular about providing various safety features to take care of the gradient, load swing, etc. Considering that the project was being executed on the western coast of India where heavy winds and storms are prevalent, it was essential to ensure good protection that could help the equipment withstand high speed wind.
All such requirements certainly needed expertise and a unique approach to design while engineering these cranes.
Taking into consideration the requirements of NRS, the ElectroMech team developed a highly customised solution built around our gantry crane. Our experience of designing solutions for over a thousand challenging infrastructure projects including the Signature Bridge, the Gangapath Bridge and the Mandovi Bridge came in handy. Earlier, we had supplied 3 nos. of gantry cranes of 100t to the main EPC company for the same project, which further reinforced the trust in our capability while being awarding the contract.
span and 30m height of lift (HOL) and supplied two identical cranes for the project. Features like span adjustment, motorised hook, hydraulic cross traverse (CT) for precise motion, emergency brakes and automated storm anchors were incorporated in both the cranes.
By procuring cranes from ElectroMech, NRS experienced several benefits such as:
Total number of cranes: 2
|Type||SWL||Span||Height Of Lift|
|DG Gantry Cranes||100t||5.35m
+/- 250mm adjustment
26m below launching girder and 4m above launching girder
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