Trenches and manholes

Waterproof earth support for trench and manhole in any kind of ground conditon.

Contracting services


Geofrost provides trench support, particularly suitable in places with groundwater challenges. The trench support follows the alignment, just as easy in turns and bends as in straight sections.

Where needed, an impermeable trench bottom is formed by frozen ground. Freezing pipes are installed vertically or inclined. Drilling for freezing pipes are easily done in between obstacles in the ground and tracks on the surface. Pipes and cables crossing the trench will be enclosed completely by the walls, giving a waterproof result.

With Geofrost's trench support, there will be no holes that could lead to sinkholes, or groundwater lowering outside the trench that could lead to settlements.


Geofrost provides waterproof temporary support for installation of manhole or culvert below groundwater level.

The manhole could be part of a larger installation with trenches or be a single connection to an existing main line. Waterproof pits can be made for installation and execution of connection works because the walls enclose existing penetrating pipes.


Geofrost provides freeze sealing between the working shaft, the pipe to be tapped and the pipe entering the working shaft.

As an alternative the whole shaft may be stabilized by ground freezing.


Any ground conditions

Geofrost excavation support works in all kinds of soil, independently of grain size distribution, permeability and water content, in any mixed soil, such as moraine, glacifluvial soils, peat, landfills, and rock of various quality.

Waterproof walls and crossing pipes

The Geofrost walls are 100 % waterproof, providing a tight sealing around crossing pipes through the walls and towards uneven rock surfaces and other materials such as steel, wood, concrete, and plastics. There is no wash out of fines resulting in risk for instability or outside sinkholes.

The freeze pipes are placed on each side of crossing pipes, making a continuous waterproof enclosing structure around the pipes. This makes Geofrost excavation support suitable in urban areas with many pipes and cables in several directions.


The freezing pipes can be installed in any angle such that the desired shape is formed. The Geofrost walls can be made with or without stiffeners or trench boxes.

What we deliver

We are a total provider of temporary earth support for trenches and manholes by ground freezing and offer all related services within consulting and contracting.

Consulting services

  • Project management
  • Design and engineering
  • Numerical analyses
  • Design report, drawings, and specifications

Contracting services

  • Planning and procurement
  • Site management
  • Drilling and surveying
  • Pipe installation
  • Plant and equipment for brine and nitrogen freezing
  • Instrumentation
  • Monitoring
  • Excavation

Where we operate

We provide our services all over Europe.


Contact person

Anne-Lise Berggren, Ph.D., M.Sc
Senior specialist geotechnics
(+47) 95 29 29 30


If you have questions or would like more information, please contact us. With project info, we quickly provide price estimates.

Ground freezing since 1986.