oa Civil Engineering = Siviele Ingenieurswese - Investigation of frost heave of oxygen plant at Iscor, Pretoria
|Article Title||Investigation of frost heave of oxygen plant at Iscor, Pretoria|
|© Publisher:||South African Institution Of Civil Engineering (SAICE)|
|Journal||Civil Engineering = Siviele Ingenieurswese|
|Affiliations||1 *Formerly Engineering Geologist with Construction, Design and Planning (Pty) Limited, presently with R. A. Spence Ltd., Consulting Civil, Soils, and Foundation Engineers, Vancouver Canada **Civil Construction and Maintance, Iscor Pretoria Works|
|Publication Date||May 1971|
|Pages||166 - 169|
|Keyword(s)||Cold box, Frost heaving, Iscor and Oxygen plant|
The phenomenon of frost heaving of the cold box in the oxygen plant at Iscor, Pretoria, occurred which presented a hazardous, complicated and unique problem for both the assessment of the parameters involved, and for the establishment of effective and remedial measures. Methods of delineating the cause of the heaving are descriptionbed, as are some of the theoretical considerations of the materials and phenomena involved. A unique drilling method was adopted whereby the drill bit was cooled to an extremely low temperature to enable frozen bedrock to be cored without melting the ice, and spark-free equipment was necessitated to prevent potential explosions in the possible oxygen-enriched environment. Both passive and active remedial measures were adopted to obviate the heave which involved drastically altering both the hydrologic and thermal regime to restore the cold box to its approximately original and static position. The measures adopted are fully explained.
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