NEW DELHI (Metro Rail News): Metroman E. Sreedharan has said that the Delhi Metro Rail Corporation (DMRC) has readied the design to reconstruct an expansion-joint-less, four-lane flyover at Palarivattom on the lines of the one at Edappally to replace the one whose cracked girders will be pulled down.
He added, while 100 of the 102 girders and the deck above will be pulled down, the piers and pier caps will be wrapped using reinforced concrete. The method is stronger and durable than carbon-fiber-wrapping that had been suggested earlier.
Mr. Sreedharan told that the design was readied in advance on Chief Minister Pinarayi Vijayan’s suggestion, to save on time. He wants me to recommend someone to supervise the rebuilding work, and I will get back to him in two weeks. The work will be executed by the Kozhikode-based Uralungal Labour Contract Cooperative Society Ltd.
The Metro man said that the estimate and tender documents will be readied in 15 days. DMRC will not be associated with the reconstruction work since our personnel here who are engaged in metro work are being diverted to other work sites. Neither will I supervise it. I will give technical guidance, in my personal capacity.
Elaborating on the scale of damage sustained by the flyover, he said since 97 of the 102 girders had suffered major or minor cracks within less than three years of the flyover being commissioned, casting doubts about the safety and longevity of the structure.
“The replacement of girders will ensure that the flyover on the Edappally-Aroor NH Bypass has a lifespan of 80 to 100 years.
He said, “The girders, which were built using the deck-continuity method, will be replaced with pre-stressed girders as was done on the Edappally flyover which was built by DMRC. The two special spans at the center of the flyover will not be replaced. Thus, vehicles can continue to go beneath the structure”.
Pre-casting will be done away with at the flyover site, so that the existing girders can be simultaneously pulled down without throwing traffic into disarray.
Mr. Sreedharan said, all bearings must be replaced. Care will have to be taken so that vehicles can proceed without being caught in snarls and by making optimal use of space on service roads.