Jamai Sasthi

AJC Bose Road Flyover


The AJC Bose Road in Kolkata is a 3 km long flyover that connects park circus with race course and is one of the longest in India. With the flyover is usually designates the crossing of a railway line or road with a pathway to a different level. A cross placed at the same level of a railway with a road, a street or a square is on the contrary a level crossing.

AJC Bose Road Flyover, India's second longest flyover and the longest in eastern India, is 3 km long flyover connecting park circus with race course. On all the structures are positioned so the interlocking elements, on which will be finally placed the prefabricated bridge real, in metal beams or modular elements in cement.

This part is now frequently assembled in part, to the side of the structure, and with a break in the traffic of the street less than a few hours you can to raise a single element so assembled using special cranes and its positioning on site.

In the case of construction of flyovers on railways, it is not uncommon that transit is only blocked for a few hours in the middle of the night and that we proceed with lifting and laying of the span in the light of photoelectric.

Once in position the upper element consolidates the structure via tie rods, so as to allow the reopening of the via bottom. Finally, we proceed to completion asphalt, guard rail, track construction, electrification. In a second phase, while waiting for the consolidation of the concrete, we proceed if necessary to the installation of the pylons intermediates, often limiting so only partial transit on the way preexisting to minimize the inconvenience.

The concept of a railway bridge can be understood also as a cross between two railroads at a different level, which, however, in the technical language is defined as artifact-through or artifact of passage. The intersection of two railroads at the same level is a railway crossing. Usually, in a structure of the modern type, not being possible to block the transit on road or rail bottom for a long time the construction is done in stages.

First you create the metalling of the earth and the structures of cement needed to build the two ramps, at the edges and at a certain distance of the via bottom. This operation is done with the use of earth-moving machinery such as bulldozers and excavators for the first phase; in the second phase we work through formwork in wood or metal coupled to the use of mixers and cranes for filling from above, thus creating rigid structures of reinforced concrete .

In a second phase, while waiting for the consolidation of the concrete, we proceed if necessary to the installation of the pylons intermediates, often limiting so only partial transit on the way preexisting to minimize the inconvenience. On all the structures are positioned so the interlocking elements, on which will be finally placed the prefabricated bridge real, in metal beams or modular elements in cement. This part is now frequently assembled in part, to the side of the structure, and with a break in the traffic of the street less than a few hours you can to raise a single element so assembled using special cranes and its positioning on site.

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