Tapi Old Bridge

Methodology for Repair

• Bituminous wearing coat and R.C.C wearing coat were removed by jack hammer using compressed air
• All plates put on expansion joints were removed
• Study of damaged portion at the point of expansion joints and cross girders were carried out
• Old cross girders were replaced by putting new cross girders with steel and concrete insitu
• Broken portion of slab was recasted after welding extra Re-Bar as per design
• Designed expansion joints, finger type were installed as per specifications
• Hanging platform for scaffold work was erected from the top of the slab
• Removal of leached, spalled, honey combed concrete surface was done manually and by Mechanical chippers
• Surface preparation was done by wire brushing and applying bond coat of Polymer Modified Cement (PMC) slurry along with coating of Re-Bar with PMC bond Coat
• Extra steel Re-Bar was added to original Re-Bar whose diameter was below 80% of original diameter and were coated by PMC slurry bond coat
• PMC mortar was applied to fill hollows and cavities manually with Masons and finished to match the existing surface
• For repairing cracks V-Groove was made by mechanical cutter and filled with Epoxy mortar
• And then wholes of 200mm depth were drilled at a distance of 300mm on both sides of the girder
• With help of nipples low viscosity Epoxy Grout was grouted from top of the slab with compressed air and Epoxy pump
• Existing damaged R.C.C parapet was repaired using Polymer Modified Cement (PMC) Mortar
• Profile corrective course of PCC was laid on the top of the slab
• Water spout were fitted as per site requirement
• Bituminous mecadum leveling course was laid on the top and bridge was opened for traffic