The Gujarat government-appointed Special Investigation Team (SIT) has in its preliminary probe found that corrosion on nearly half of the wires on a cable and welding of old suspenders with new ones were some of the major faults that led to the collapse of a suspension bridge in Morbi last year in which 135 people were killed.
Of the two main cables of the British-era bridge, built by the erstwhile rulers in 1887 over the Machchhu river, one cable was having issues of corrosion and nearly half of its wires “may be already broken” even before the cable snapped on the evening of October 30, 2022, the SIT noted.
The main cable on the upstream side of the river snapped, leading to the tragedy, as per the SIT. The findings are part of the ‘Preliminary Report on Morbi Bridge Incident’ submitted by the five-member SIT in December 2022. The report was recently shared by the state Urban Development Department with the Morbi Municipality.
Ajanta Manufacturing Limited (Oreva Group) was responsible for the operation and maintenance of the British-era suspension bridge on the Machchhu river which collapsed on October 30, 2022. The SIT found several lapses in repairs, maintenance and operation of the bridge.
Each cable was formed by seven strands, each comprising seven steel wires. Total 49 wires were clubbed together in seven strands to form this cable, the SIT report said. “It was observed that out of the 49 wires (of that cable), 22 were corroded, which indicates that those wires may have already broken before the incident. The remaining 27 wires recently broke,” it said.
The SIT also found that during the renovation work, “old suspenders (steel rods which connect the cable with the platform deck) were welded with the new suspenders. Hence the behaviour of suspenders changed. In these types of bridges, single rod suspenders should be used to bear the load”.
