Author(s): Tsutomu Kokawa
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Abstract: A field study on both the construction and creep test of a 15-m span and 3.3-m rise ice dome was carried out at Hokkaido Tokai University in Asahikawa during the winter of 1986. The dome was constructed by the following method which satisfies fundamentally the facility of a rapid, easy and economical construction. Inflating a membrane bag covered with ropes anchored to the snow-ice circular foundation ring. Covering the membrane with thin snow-ice sherbet by blowing the milled snow with a rotary snow-plow and spraying tap water with a high pressure adjustable nozzle. Solidifying the snow-ice sherbet due to cooling by cold outside air. Repeating the application of snow and water up to the desired shell thickness. Then removing the bag and ropes for reuse. The completed dome had a good quality of ice and the inside light sufficiently transmitted through the dome. After construction, a creep test was carried out under snow load, and the structural behaviour up to the collapse was examined, as the results, the central displacement rate at the secondary creep stage was about 1.5 mm/day, its lifespan was from January 15 to April 3, and it was shown that the dome had good enough structural efficiency. Based on the result of this study, the production of a large span ice shell could be practicable.
Year: 1988