只見線におけるナダレ防止杭にかかる雪圧

概要

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Max. depth of snow-cover in the Tadami region average 3m5m. Before providing protection snow, to collect snow data, poles 2m or 3m long were set up for preventing avalanche at glens and uniform slops. Four simple snow manometers were fitted on these 2m poles (B type pole), six simple snow manometers on the 3m ones (A type) 1) The total pressure on the poles was greater at glens than on uniform slopes. (about 10 ton) 2) A type poles were almost deformed at glens. 3) The total pressure on B type poles was about 10 ton at glen, and 5 ton8 ton at uniform slopes in A test section; 5 ton6 ton in B test section and 6 ton8 ton in C test section. 4) According to the data on B-type poles bending moment are nearly equel to total pressure, 5 tons10 tons. 5) Avalanche poles taller than 2 m are found useless both technically and economically.