Balaram Bridge

Damage of Bridge

 

This project comes under East-West corridor and also connectivity to Kandla port, Abu road which comes under this package declared as Industrial park support by RIICO.

Due to development of these industries units the commercial heavy traffic has been increased at a rapid pace after the construction of Balaram Bridge.

Based on the visual inspection by (hammering, chipping), N.D.T. test such as ultrasonic test, rebound hammer test, half cell potential test and concrete core cutter test.

It was concluded that the foundations & the substructures of the bridge were in good working condition but superstructure part was in severely distress condition. Due to progressive deterioration the following defects were noticed in the superstructure and bearings which affected the serviceability/durability.

Observations

 
  • Bearing- The bearings of span 3 were rocker and roller. At P3 U/S side roller bearing was tilted while at D/S side bearing was shifted from their original location and so it was in a distress condition and non functional. This in turn led to secondary stresses being developed in the girders which in turn led to distress of girder. It was also observed due to failure of bearing, several cracks were developed in girders and diaphragm beams. The movements were observed in both longitudinal and lateral direction while plying of vehicles due to tilting and shifting of roller bearing and span was settled up to 100 mm while P2 rocker bearing and pedestal was in good condition. The other bearings were filled with dust and their grease collecting pockets were broken which badly affected their lubrication.
  • Main Girder and Diaphragm beam- At several portions leaching, spalling of concrete, exposed and corroded reinforcement, inadequate cover, honey comb and cracks are observed.
  • Bottom slab- Mainly in cantilever portion exposed and corrugated reinforcement, honey comb, inadequate cover observed.
  • Top slab- Leaching and cracks are observed in some portions of top surface of slab.
  • Drainage spout- The length of drainage spout is very small and it is not designed properly and maintained so it was it malfunctioning.
  • Expansion Joint- Designed expansion joint are not provided which is leading to heavy damage to top surface of slab at the junction of two span and leakages of rain water leading to deterioration of concrete & corrosion of reinforcement.
  • Cement concrete wearing course- Cracks & spalling of concrete in several places in slab.
  • Kerb beam and Parapet wall- These are very badly damaged where exposed and corroded reinforcement and spalling of concrete is observed.
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