Holistic Thermal Assessment and Control Of The Artificial Ground Freezing For The New Underground Station "Museum Island " in Berlin-PPT Presentation

PPT Presentation

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The presentation describes the design and thermal control of an artificial ground-freezing project for Berlin’s new U5 Museum Island station, located amid historically valuable buildings. The ground includes infill, sands of the Berlin glacial valley, glacial till, and meltwater sands.<br /><br />The frozen body was designed to support freeze-tunnelling through Berlin sands. Three coupled chillers provided 1.3 MW of freezing capacity, circulating brine through 81 m of pipework. The target frozen zone measured approximately 105 × 26 × 12 m, with an initial freezing period of 80 days.<br /><br />Control requirements specified minimum mean soil temperatures and frozen-wall thicknesses in different sections of the tunnel. During the cooling and maintenance phases, engineers assessed temperature profiles and the thickness between the −2°C isotherms to verify that the frozen body met design requirements.<br /><br />Monitoring used a mobile, web-based 3D visualization system with near-real-time, high-frequency data. The digital monitoring network included 1,911 temperature sensors and 81 pressure sensors. The presentation emphasizes integrated thermal assessment and continuous monitoring to manage freezing conditions during construction.

Keywords

artificial ground freezing

Berlin U5 station

Museum Island

freeze tunnelling

thermal control

frozen body

brine circulation

temperature sensors

pressure sensors

3D monitoring