in Berlin

The reconstruction and restoration of the New Museum on the Museum Isle in Berlin, involved complex underground engineering work which included building of maintenance and installation corridors. The challenge during the reconstruction work was to avoid subsidence of this historically important building which was originally built using timber pile foundations. With the help of nitrogen freezing, several frost bodies were created to carry the load underneath these old foundations.
In order to create a watertight excavation for a lift pit, the area surrounding the floor and sides of the pit were frozen. A total of 126 freeze pipes, each two to fifteen metres long, were arranged inside the building, along the southern facade and around the future lift pit. After the initial freezing phase, some of the pipes had to be reduced in length and re-located under the newly-installed frozen ground slab. They were then operated for a further five months ensuring that part of the building remained stable and safe.
While the ground was being frozen from +15° C to a maximum of -70° C, up to five tankers of nitrogen were required daily. To maintain the frost body, a reduced amount of about one tanker a day was necessary. The system comprised 126 magnetic valves, 265 temperature sensors and four oxygen sensors. It was monitored by Max Bögl’s own ground freezing control unit.



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