Underground Railway Tunnel

1

Marked cracks on the tunnel slab

2

Chipping the grooved cracks

3

Providing bunds ranging from 0.4 mts. to 0.8 mts. c/c distance

4

Pouring monomer grout alternatively in the groove

5

Crack sealed from bottom, leaving one weep hole in the corner

6

Crack being Hydrotested after repairs

Make OR Break Factor

The thickness of the concrete slab varied from 0.7 mts. to 2 mts. and extreme diligence had to be exercised to ensure material penetration throughout the cracked concrete.

THE CHALLENGE :

  • The underground tunnel was facing water leakage issues due to shrinkage and thermal cracks in the deck slab.

THE ODDS :

  • Extreme climatic conditions to work in
  • Imperative condition was to test cracks for water tightness pressure of up to 6 kg/cm²

OUR RESPONSE :

  • The improvised site-specific system was designed for to repair cracks
  • All material and systems were developed so as to enable us to grout against the pull of gravity
  • All material used was modified to work across diverse summer and winter conditions