NETAPP INDIA Private limited
Bangalore, INDIA
The main scope of work is to providing complete waterproofing services at the basement 1,2 & 3.
Around 5500 sq.m of retaining wall scanned.
37000 no's of holes are drilled.
44 metric tones of resins injected into the retaining walls.
Project completed in a duration of 96 working days.
Marking
Scanning
Positioning of drill hole points.
Drilling
Fixing of NRV packers
Injection of Grout
Removal of NRV packers
Packing of Drill Holes.
To provide the drill holes in alternative staggered manner the grid lines are marked in 200mm x 400mm.
Coloured laces are used to mark on the walls.
Totally 5400 sq.m area scanned by using the GPR Device.
Scanning of the wall carried to provide the safe drilling without damaging the reinforcement.
Ground Penetration Radar(GPR) device is used to find the reinforcement.
Exact positioning of main bar and distribution reinforcement are found by this non destructive test method.
As per the client requirements there are three different types of holes namely straight, inclined, double inclined holes.
To differentiate these holes we marked these drilled points in three different colours namely blue, red and pink.
16mm dia holes are drilled.
Drilled holes are in 300mm length.
Drilling is done with care to avoid puncturing existing waterproofing membranes.
Totally 37000 Nos of holes are drilled.
Non Returnable Valve packers are fixed in the drilled holes.
To avoid the seepage of the grout material we provided the NRV packers.
These NRV packers are fixed and tightened with the help of mechanical spanners.
Single component, phthalate free, low viscosity hydrophilic polyurethane injection resin is used.
The resin is injected by using the two component high pressure grout pump.
The resin is mixed with the water in the ratio of 1:1 by means of static mixture.
The resin has the expansion capacity of 3-4 times of its own volume while it reacts with the water.
1kgs,1.25kgs & 2kgs are injected on the walls, column wall junctions & wall floor junctions respectively.
Totally 44 Metric Tonnes of Resin Injected.
After 48 hrs from the time of injection the NRV packers are removed.
After removing of packers, drill holes are packed with the Non shrink grout material.
While excavating on the other side of retaining wall we witnessed the foam formation.
The foam is formed in between the existing waterproofing membrane and the retaining wall.
The foam is formed with the average thickness of 15 mm -50 mm and fully covered the wall.
Anagha Engineers 2024
New Delhi