Namma Metro – Honeycomb problem: passengers who commute every day using metro purple line were inconvenienced due to ‘Honeycomb’ near Trinity Metro station.
Namma Metro services between Indiranagar and MG Road were suspended for about three hours on 12th December 2018 morning. The cause was due to a concrete girder which had come out slightly off the beam near Trinity metro station.
The engineers of BMRCL have temporarily fixed faults in metro structures that developed due to what is technically called ‘honeycomb’ formation near Trinity circle metro station.
Honeycomb formation – Namma Metro
‘Honeycomb’ form in concrete due to imbalances in materials used while constructing. It may also be due to poor cement to water ratio, improper placement of reinforcement bars in the horizontal and vertical beams of the pillars.
The cause for ‘honeycomb’ formation may also be due to steel or iron bars not placed properly after concrete is poured or use of substandard materials.
The BMRCL detected a structural flaw in one of the viaducts. The problem was not only the honeycomb formation. At pillar No.155 the slider, also known as the concrete slabs which are supported by a pillar had shifted from its original position.
The BMRCL authorities have asked the engineers to concretize the slider. As a temporary measure, a metal jack has been kept next to the pillar to support the slider.
Delay in the trip of Namma Metro
The BMRCL said that the delay was due to technical difficulties. The honeycomb was formed under the metro tracks on Pillar no,155. Speed restrictions were imposed. The affected area was barricaded.
The repair work will continue for 3 days.
Public Opinion on Namma metro problem
The Bengaluru commuters are of the opinion that it may happen at any metro lane in the city. The contractor should be sent to jail. The BMRCL officials who supervised the work and cleared the bills should be terminated.
Previously it was problems with roads, traffic, pollution, flooding and now even namma metro has gone the same way.
Read more related to namma metro: https://www.bangalorean.com/blog/metro-purple-line-shut-dec-22-23/