Shaftsinking with Ground Freezing

Deilmann-Haniel is one of the leading firms in ground freezing.

Ground freezing is used when we face water-bearing ground conditions and/or weak rock, for example quick sand.

  • The technique consists of developing a wall of frozen soil around the shaft, which prevents the ingress of water and stabilizes the ground. To achieve this, we drill vertical holes surrounding the shaft, circulate a cooling agent in the casing, which results in freezing of the surrounding soil
  • Once the ground is frozen, the ground properties are similar to those competent rock, which enables us to sink the shaft using conventional drill and blast technique
  • Subsequently a waterproof shaft liner is installed