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Structural Rehabilation & Retrofitting
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STABILISATION OF VERTICAL PIT FACES USING P T TECHNIQUE

At one of the projects it was proposed to construct a underground structure measuring about 15 m x 15 m in plan and 27 m in depth.  The excavation was commenced and was carried out to a depth of about 17.0 m from ground level.  It was observed that the soil profile was very peculiar i.e. it was Hard rock for the first 7.0 m (after about 1.0 m soil) and then from 7.0 m to 14.0 m level it is disintegrated weathered rock and again from 14.0 m level onwards it is Hard rock.

  The Pit as seen from top
   

At one of the projects it was proposed to construct a underground structure measuring about 15 m x 15 m in plan and 27 m in depth.  The excavation was commenced and was carried out to a depth of about 17.0 m from ground level.  It was observed that the soil profile was very peculiar i.e. it was Hard rock for the first 7.0 m (after about 1.0 m soil) and then from 7.0 m to 14.0 m level it is disintegrated weathered rock and again from 14.0 m level onwards it is Hard rock.

  Photo showing portion of sides collapsed
   

Various options were considered including shotcreting or providing Vertical wailer structural steel, but it was concluded that none of the systems were technically and practically feasible.


Varshitha was called in to provide their services and with the innovative technique of Use of Post Tensioned system the vertical slopes were stabilized in a record time of only 15 days.  The system adopted is shown in the sketch below:

   

At one of the projects it was proposed to construct a underground structure measuring about 15 m x 15 m in plan and 27 m in depth.  The excavation was commenced and was carried out to a depth of about 17.0 m from ground level.  It was observed that the soil profile was very peculiar i.e. it was Hard rock for the first 7.0 m (after about 1.0 m soil) and then from 7.0 m to 14.0 m level it is disintegrated weathered rock and again from 14.0 m level onwards it is Hard rock.

  After fixing of Chain Link Mesh on the sides
   
Before fixing the H T strands, the vertical faces were draped by 100 mm x 100 mm x 4 mm chain link mesh which is expected to provide the first line of defense for small rocks.  The H T strands were then stressed to a load of approximately 5-6 tons each.
           
Stressing in progress                                                              After fixing the H T Strands
   

Once this stabilization was completed further excavation in the pit was commenced to the required level of    - 27 m and successfully completed.

 

 

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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