Engineers from other cities are coming down to see the bridge, says head of Railway over-bridges
The steel bridge built by L&T Metro Rail-Hyderabad (L&TMRH) over the existing Oliphant rail over-bridge at the Secunderabad railway station for the Hyderabad Metro Rail (HMR) project has become a benchmark in construction of bridges in terms of strength, speed of construction and safety, said its General Manager, head-Railway Over Bridges M.Y. Kondalu, here on Friday.
“Metro rail projects are being built in several cities like Nagpur, Lucknow and Ahmedabad. Everywhere railway lines have to be crossed and engineers are coming to see how we have done this bridge,” he said, while delivering the Dr. A. Ramakrishna sixth endowment lecture on ‘Hyderabad Metro Rail construction’ organised by The Institution of Engineers, TS Centre.
Work of expertise
Mr.Kondalu explained that the 1,150-tonne bridge was assembled near the current site and pushed towards crossing the Oliphant carefully even while trains were running, road traffic was moving and at least five lakh people were using the stretch.
“We had to micro plan each and every step from the bolt and washers of the bridge to precision engineering in assembling the steel frame without compromising on quality or safety. The lab design simulation has to be done at the site with varied situations but the entire project has been built in this manner,” he said.
Each bolt of the 56,000 high tension bolts on the bridge alone took 45 days to be fixed and these were tested from the factory itself. All tests were done before the next stage of construction was taken up 200 metres above the ground.
The Malakpet metro rail over-bridge was built in 21 days, which was another record feat, and bridges to cross railway lines were built across Lakdi-ka-pul, Malakpet, Begumpet, Chilkalguda, Alugadda Bavi and second steel bridge at Bhoiguda.
At times, these metro bridges had to cross 10 existing and five planned tracks on ground at double decker level since the railways wanted the option to be kept open for future trains, he said.
Mr. Kondalu, who served the Indian Railways for 29 years as chief engineer, extolled the contribution of L&T’s A. Ramakrishna for making pre-cast, pre-stressed construction technology to the country and being the prime force behind building several landmark structures, including HiTec City.
On the occasion, D. Pranvi of JNTU was presented with the A. Ramakrishna gold medal for topping the pre-stressed concrete subject in engineering course.
Source: The Hindu