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THE HUGUENOT TUNNEL: A MAJOR FEAT OF ENGINEERING.

Author(s) : LOTERYMAN M. J.

Type of article: Article

Summary

A REPORT ON THE SOIL FREEZING TECHNIQUES THAT WERE EMPLOYED TO ENABLE BORING OPERATIONS FOR THE 4 KM LONG HUGUENOT TUNNEL UNDER THE KLEIN DRAKENSTEIN MOUNTAINS IN SOUTH AFRICA. BECAUSE OF THE UNSTABLE NATURE OF THE SATURATED DECOMPOSED GRANITS AT THE WESTERN PORTAL OF THE TUNNEL, SOIL FREEZING WAS ADOPTED TO EXCAVATE THE FIRST 168 M OF THE BOREHOLE. THE TEMPERATURE OF THE EARTH WAS MAINTAINED AT 273 K (0 DEG C) BY TWO 350 KILOWATT AMMONIA COMPRESSORS TO CHILL THE SECONDARY REFRIGERANT (CALCIUM CHLORIDE) CIRCULATED IN THE PIPING BURIED IN THE SOIL. THE VENTILATION SYSTEM AND THE SERVICE FACILITIES FOR THE TUNNEL ARE ALSO DESCRIBED. A. H. S.

Details

  • Original title: THE HUGUENOT TUNNEL: A MAJOR FEAT OF ENGINEERING.
  • Record ID : 1989-1182
  • Languages: English
  • Source: S. A. Refrig. Aircond. - vol. 4 - n. 4
  • Publication date: 1988/07
  • Document available for consultation in the library of the IIR headquarters only.

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