SNOW MELT PREVENTION AND SNOW COMPACTING METHOD IN SNOW PLAYING FACILITY

摘要

PROBLEM TO BE SOLVED: To prevent snow from being melted by providing low temperature air blowing means on a base of accumulated snow and making a plurality of air holes from the surface of snow cover to the base at certain intervals. ;SOLUTION: Low temperature air is jetted into snow cover 3 from nozzles 5a of a header pipe 4 laid on the whole portion of the base 1, and cold air is uniformly cooled and permeated into the whole of snow. Next, the low temperature air arrives at an air hole 7 through air gap of snow 3, then rises up and is released from the surface of snow 3 to the outside; this air has a density larger than that of atmosphere so that the air flows in a laminar shape along the surface of the snow 3, and sensible heat transmission from the outside air on the surface of snow 3 is interrupted. Next, surroundings of the hole 7 and the snow 3 at an upper portion are frozen by the low temperature air permeated from the hole 7 to the snow 3, and the hardness and shearing strength increase. Moreover, cold heat is sequentially given from the lower layer of snow 3 to the upper layer so that the hardness and shearing strength of the lower layer become larger than those of the upper layer. By doing this, a good condition having no snow peeling can be maintained and the phenomenon of snow avalanche can be prevented even though the angle of tilt of the base is large.;COPYRIGHT: (C)1999,JPO