Rlys to replace 26 British era bridges with RCC boxes in CR’s Ngp Division

Source: The Hitavada      Date: 30 Sep 2018 09:13:44


 

By Sagar Mohod,

The move is part of modernisation of bridges to improve safety and increase train speed

Relics of British time, the railway bridges are due for replacement as most of them have completed their life span. In the first phase, minor bridges over waterways are marked for replacement. Of those marked, 26 are in Central Railway’s Nagpur Division. The substitution of these bridges is as per the policy approved by Railway Board as major cause of slowdown in speed in section is presence of stone structures built over a century ago.


Ten sites for construction of new bridges are in Wardha-Badnera section and five other are sanctioned on Tadali-Ghughus section. The 15 bridges in these two sections are open type constructions, side walls of these structures are built with stone masonry and thereafter rails were placed atop them. Here the division officials have identified placement of pushing and sliding method for putting in place pre-fabricated reinforced concrete construction (RCC) boxes in Wardha sub-section and open and cut method for Ghughus area. At Ghughus sufficient bank is available and it being only goods line it would be easier with latter approach to place the RCC boxes.


Further, 11 bridges in Wardha-Badnera section also are to be replaced. Here, there are flat stop or stone bridges built entirely of stones. The division has decided to go for pushing method of 1.5x.1.5 metres RCC boxes.


As all the bridges are minor the cost of replacement is not very high, around Rs 2.50 lakh each, said a senior official. The placement of new RCC boxes won’t take much time. After the new bridges are opened for traffic it’s going to improve reliability and speed of trains moving through the two sections, that are administered in Southern wing of Engineering Department of Nagpur Division.


Majority of these small bridges are over century-old structures built using stones masonry as was the style in vogue that time. Some are open bridges, means the side walls are made of stones cemented together with mixture while others are flat stone top bridges. Small nullahs flow at these sites where the bridges are located and division has identified two types of technology, one that of pushing and sliding method and other for placing in new bridges, said the engineering officials.


At places where enough bank height is available pushing and sliding method is identified and at others only boxes are going to place using pushing method at the existing bridge sites. As the RCC boxes are small size, the placement would be done within three hour block period. That way no major traffic disruption will take place as longer block will not be needed.


The advantage with new bridges will be that speed restriction will end and worries during time of heavy rains would end as with RCC box enough width will be available for smooth flow of water. During rainy season British time bridges need constant monitoring to ensure they are fit and fine, explained another engineering official.