Arrangement for freezing soil in tunneling, comprises freezing tubes partly made of brittle materia

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To in drops, about in the shaft-, pits-, tunnels or tunnel construction, before earth and water ingress to protect personnel and apparatus is often the technique of soil freezing applied. While this is going on, so-called freezing lances for use. Such freezing lances comprise freezing pipefreezing tube plate closed at its one end face with a a is arranged above the inside whereof a freezing tube plate -ended inner tube. By freezing lances with a refrigerant feed of, for example, liquid nitrogen, the surrounding ground is cooled, forms a frost unit until around the freezing lance. A disadvantage when using the freezing lances according to the state of the art is that no drops freezing lances occupied can lead can be made in the frost unit with, since the freezing lances to damaging of a earthworking machine. freezing pipefreezing lanceaccording to invention is/the outer and the inner tube are constructed of a brittle material, at least in some sections, a. After freezing bodyfreezing lance in the course of working the soil from the working machine can the production of the be destroyed, without that the machine is damaged in the process. This will also drops freezing lances fitted in a possible frost unit with. As the material is used in this case in particular a composite material comprising a thermoplastic polymer and a thermally highly conductive filler, about coal or metal.