FOUNDATION FREEZING

GROUND FREEZING WAS SELECTED AS THE MOST ECONOMICAL AND SAFEST METHOD OF TEMPORARILY SUPPORTING THE WALLS AROUND THE EXCAVATION SITE OF THE ARIZONA REPUBLIC AND PHOENIX GAZETTE BUILDING IN PHOENIX, ARIZONA. IF THE GROUND FREEZING TECHNIQUE WERE NOT AVAILABLE, THE JOB COULD ONLY HAVE BEEN DONE BY CONSTRUCTING EXPENSIVE HEAVY-DUTY SHORING. SLOPING THE SIDES AROUND THE SITE WAS IMPOSSIBLE BECAUSE OF LOOSE SOIL CONDITIONS. APPROXIMATELY 320 FREEZE PIPES 33 FEET IN LENGTH WERE INSTALLED VERTICALLY, IN TWO ROWS 3 FEET APART, AROUND THE EXCAVATION. WATER WAS FED INTO A SHALLOW TRENCH BESIDE THE PIPES AND ALLOWED TO SEEP INTO THE GROUND. TWO PORTABLE REFRIGERATION UNITS LOCATED CLOSE TO THE EXCAVATION SITE CIRCULATED A COMBINATION OF BRINE AND FREON THROUGH THE FREEZE PIPES. IN 30 DAYS THE TWO UNITS PRODUCED A FROZEN WALL OF EARTH VARYING FROM 5 TO 20 FEET IN THICKNESS AROUND THE EXCAVATION. THE STRENGTH OF THE FROZEN WALL IS EQUAL TO THAT OF CONCRETE, EVEN UNDER THE ARIZONA SUMMER SUNSHINE. THE PIPES OF THE REFRIGERATION SYSTEM ABOVE GROUND ARE COVERED BY SUN REFLECTING, WHITE PLASTIC SHEETING. THE WALLS OF THE EXCAVATION ARE COVERED BY THE PROTECTIVE SHEETING AND FURTHER GUARDED FROM THE SUN AND HEAT BY SHEETS OF FIBERGLASS INSULATION. WHEN THE BUILDING FOUNDATIONS REACH GROUND LEVEL, THE SPACE BETWEEN THE FOUNDATION AND EXCAVATION WALLS WILL BE FILLED AND WARM WATER WILL BE FED INTO THE FREEZER PIPES. WHEN THE FROZEN WALL OF EARTH HAS THAWED THE PIPES WILL BE WITHDRAWN FROM THE SOIL. THE FREEZE JOB IS AN EFFICIENT AND ECONOMICAL WAY TO PROVIDE SHORING FOR LOOSE SOIL CONDITIONS.

  • Availability:
  • Supplemental Notes:
    • Vol 51, No 9, PP 30-31, 2 PHOT
  • Publication Date: 1969-9

Media Info

  • Serial:
    • Constructor
    • Publisher: Associated General Contractors of America
    • ISSN: 0162-6191

Subject/Index Terms

Filing Info

  • Accession Number: 00215248
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 20 1970 12:00AM