Grout curtains for post-construction waterproofing of earth-retaining building elements

Grout curtains for post-construction waterproofing of earth-retaining building elements

A grout curtain is a post-construction technique for waterproofing entire earth-retaining surfaces from inside the building. The technique is employed during the repair of moisture damaged structures when the affected element is difficult or not (economically) possible to access from the outside – for instance cellars, tunnels, channels or shafts that are deep underground.

A grout curtain refers to the process of when the injection material is not only injected into the structure but also into the surrounding subsoil. In order to reach this soil from inside the structure, precise boreholes that follow a specific pattern are drilled piercing the wall completely. The grout is injected using injection lances at exactly the right pressure to ensure that an effective grout curtain results on the outside of the structure.

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