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Structural Rehabilation & Retrofitting
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Innovative method of stabilizing rocks by Post Tensioning
(Structural Rehabilation & Retrofitting)


At Durga Malleswari temple, Vijayawawada, AP it was proposed to widen the road on to the hill by excavating part of the hill, which would enable to ease the congestion especially during the peak festival season.


This required blasting the rock to widen the road.  In the process of uncontrolled blasting, the rocks have become very unstable and reached a point of no return.  At this stage it is very difficult to stabilize the rocks by the proposed conventional method of rock bolting as not only it is very difficult to access the rocks to the height of 60 m and neither scaffolding can be erected to such heights.  Further, there is a great risk of further destabilizing the rocks during the drilling process.


M/s Varshitha has been called in to suggest a suitable method to address the practical difficulties and also suggest and execute a suitable system to stabilize the rocks that too in a very short available period of 20 days before the festival season. 

Innovative technique of use of Post Tensioning method was adopted and executed successfully.  The process involved the following steps:

  • Drilling pair of holes at a spacing of 1.0 m c/c in stable rocks both top and bottom with a spacing of 300 mm between each hole in the pair.
  • Depth of hole shall be 2.0 m
  • Fixing 3 m long HT strands in the drilled hole using polyester resin grout.
  • Fixing anchor blocks both top and bottom to each pair of HT strands
  • Connecting the corresponding anchor blocks at top and bottom with HT strand (HDPE pipe covered and coated with anti corrosive coating).  Locking the same with barrel and wedge system.
  • The strands are stressed to approximately 4.0 tons each and thus effectively pressing down the rocks and locking the same.
  • Chain link mesh is spread over the strands securely tied to the strands and anchors.  Chain link mesh is mainly to stop any smaller pieces of rock rolling down.

The complete job was carried out in less than 90 days well before the rush season of the temple and the total stretch completed is 420 m

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Structural Rehabilation & Retrofitting
1. Innovative way of dismantling retaining wall by use of Post Tensioning Technique
2. Restoration of a Failed Bridge
3. Jaw Crusher Demolition of Towers
4. High Reach Demolition 4th Floor P T Slab Demolished
5. Stabilization of Vertical Pit Faces Using P T Technique
6. Removal of Columns by External Post Tensioning Technique to Increase Spans
7. Structural Rehabilation & Retrofitting
8. Removal and Recasting columns in a under construction building
9. Restoration of a National Highway Bridge under distress
10. Restoration of Bridge damaged by poor expansion joint maintenance
11. Restoration of a Heritage building at Hyderabad Public School
12. Restoration of Bridge damaged by Earth Quake at Andaman
13. Restoration of Fire Damaged Building, Hyderabad
Concrete Sawing & Core Driling
Bearing Replacement & Bridge Lifting