某金属鉱山におけるさく岩機使用者の振動障害の実態

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タイトル別名
  • ON VIBRATION HAZARDS IN ROCK-DRILL OPERATORS OF A METAL MINE
  • ボウキンゾク コウザン ニ オケル サクガンキ シヨウシャ ノ シンドウ ショ

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Before leg-type rock-drills were used, a good many reports were made on health disorders caused by using fixed type rock-drills. Since 1965 in Japan, many investigations have been pursued as to vibration diseases of forest workers using chain-saws, and it was found that many forest workers were suffering from Raynaud's phenomenon, and pain, numbness and muscle's weakness of the upper extremities.<BR>But reports of vibration diseases caused by using leg-type rock-drills are much fewer in number, and very few comprehensive papers can be seen in Japan.<BR>We have investigated the working conditions and health status of workers using rock-drills in a zinc mine, and on the basis of its results we have been making efforts for the prevention of vibration disease. The present paper is a report of our investigations.<BR>The work was a two-shift system by two groups, and their working hours in pits were 300 minutes, and hours spent in using rock-drills were on an average about 180 minutes. At the pit face in pits, air temperatures were 17 to 20°C and humidities were 90 to 100% all the year round. Noise levels due to rock-drills were 117 to 118 dB at the position close to worker's ears and acceleration of rock-drill vibration was about 130 m/sec2 (_??_13g) or VAL 142.1 dB at about 40 Hz. Physical examinations were made 71 workers in May, 1974. Of these, 45 were using rock-drills (A Group), 8 had stopped using rock-drills for less than two years because of severe vibration disease (B1 Group), 8 had stopped using rock-drills for more than two years (B2 Group), and 10 were healthy pit workers not using rock-drills (C Group).<BR>Their average age, and the years they spent using rock-drills were, A Group ; 39.4, 12.8, B1 Group ; 39.1, 15.3, B2 Group ; 43.9, 10.5, and C Group ; 40.4.<BR>Attack rate of waxy white fingers was 80% in A Group, 100% in B1 Group and 38% in B2 Group. That of benumbed hands and fingers was 51% in A Group, 75% in B1 Group and 38% in B2 Group. And that of painful hands and fingers was 33% in A, 75% in B1 and 25% in B2 Group.<BR>The subjects were given such objective tests as decrease in the grasping power and pinching power, tapping test, cuff test, and cooling test, by immersing the hands in 10°C cold water.<BR>B1 Group was worst in the results of physical examinations and A, B2, and C Group were of good results in an ascending order. Abnormalities discovered through the objective examinations proved to be correlated to subjective complaints. Therefore, these tests can be said to be useful in picking up suffered men among laborers using leg-type rock-drills.

収録刊行物

  • 産業医学

    産業医学 19 (5), 256-265, 1977

    社団法人 日本産業衛生学会

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