| Abstract | An opening eleven feet, five inches, In diameter had to be cut in the south wall of No. 4 test cell exhaust enclosure. This wall, sixteen to eighteen inches in thickness, is made of concrete, reinforced with one-inch-by-three-lnch vertical steel bars on 24-inch centers, in addition to conventional reinforcing.
The common method of demolition, using a compressed-air concrete breaker, was discarded, due to the possibility of deterioration or destruction of the remaining structure, which is supported on weathered rock a very short distance below the opening.
Oxygen-lance cutting was then proposed and adopted experimentally, to avoid shattering and spalling of the wall, particularly the narrow section on the weathered rock. |
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