BARK AS A FROST INSULATOR IN THE GROUND

LARGE STRETCHES OF THE NORWEGIAN RAILWAY SYSTEM ARE SUBJECT TO DESTRUCTIVE FROST HEAVE WHICH MAKES NECESSARY CONSTANT SHIMMING BETWEEN THE FROST HUMPS. IT HAS BEEN FOUND NECESSARY TO EXCAVATE FROST-HEAVING SOIL AND TO REPLACE IT BY NONFROSTHEAVING MATERIAL. THIS SOIL REPLACEMENT IS CARRIED OUT WITH EXTREMELY FROST-RETARDING MATERIAL IN RELATIVELY THIN LAYERS. PRACTICAL EXPERIENCE FOR MORE THAN 50 YEARS HAS SHOWN THAT WET PEAT IS EXTREMELY FROST RETARDING. THE PEAT IS LAID DOWN AS HARDPRESSED BLOCKS BENEATH THE BEARING LAYER. IN RECENT YEARS DISCARDED SLEEPERS OF PINEWOOD AND BARK FROM PINE AND SPRUCE HAVE ALSO BEEN USED. EXPERIENCE HAS SHOWN THAT PEAT, WOOD AND BARK HAVE SUFFICIENT DURABILITY AND THAT THE RELATIVELY GREAT COMPRESSION UNDER TRAIN LOADS DOES NOT CAUSE SERIOUS DAMAGE OR INCREASED MAINTENANCE WORK. THE THICKNESS OF THE FROST- INSULATING LAYERS IS DETERMINED ACCORDING TO THE LOCAL QUANTITY OF FROST AND THE FROST RESISTANCE OF THE MATERIALS SELECTED.

  • Supplemental Notes:
    • pp 283-286, 3 FIG
  • Corporate Authors:

    Norsk Skogindustri

    ,    
  • Authors:
    • Skaven-haug
  • Publication Date: 1964-8

Subject/Index Terms

Filing Info

  • Accession Number: 00237355
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM