Accession Number : AD0821550

Title :   A FREEZING TECHNIQUE FOR GAGE PLACEMENT.

Descriptive Note : Technical rept. Sep 66-Apr 67,

Corporate Author : AIR FORCE WEAPONS LAB KIRTLAND AFB NM

Personal Author(s) : Lemont, Charles J.

Report Date : OCT 1967

Pagination or Media Count : 26

Abstract : A problem exists when gages are to be placed in drill holes below the water table. Freezing the soil around a proposed instrumentation hole was attempted as a solution to the problem. Laboratory and field tests proved that liquid nitrogen would freeze a zone of soil around the supply tube and that an instrumentation hole, drilled into that zone, would remain water-free long enough to allow instrumentation to be placed and the hole to be backfilled. It was concluded that the freezing technique was a solution to the problem of placing gages below a static water level in the soil. (Author)

Descriptors :   (*MEASURING INSTRUMENTS, SOILS), (*SOILS, FREEZING), UNDERGROUND STRUCTURES, NITROGEN, LIQUEFIED GASES, PIPES, INSTRUMENTATION, PUMPS, SAND, THERMOCOUPLES, TEST METHODS.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE