Ground Freezing

Ground freezing is a technique that converts water to ice in the ground to temporary create water cuts walls and stabilize the ground.

• Strength of up to 10MN/m² and has perfect water cut-off
  (Chemical Grouting < Jet Grouting <Ground Freezing)
• No chemicals or cements are used for stabilization, so nothing will be left after the construction is done.
• Can be applied in any soils, as long as there are moisture.
• Quality of frozen soil can be managed in real-time by temperature.

A ground freezing technique that uses natural refrigerants and without freon

• Better thermal efficiency than brine and freon, because it uses both “sensible heat”  and “latent heat of vaporization”
• CO₂ and NH₃ are all natural refrigerants
• CO₂ has low viscosity which reduce friction
  • Reduce pipe diameter → Improve work efficiency
  • Reduce pump size → Reduce power consumption by approx. 60%

• Easy to install (can be installed by insertion only)
• Light in weight (0.3kg/m)
• Excellent thermal conductivity
  ⇒Reduce construction period and cost, and improves overall efficiency

Water cut walls for shield departure and arrival

Connecting of shield tunnel

Expansion of structures

• We have track record reducing 40 days of construction duration using our new freezing method compared to conventional brine method; and reduced 20% of constructing costs.
• We have experience in ground freezing technique and have been used in many great depth shield tunnel projects.