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混凝土搅拌机一直是噪声较大的一种常用建筑机械,其工作噪声往往是局部地区噪声污染的主要声源之一。过去,混凝土搅拌标准规定,操作人员人耳位置的噪声不允许超过90dB(A),此数值已达国际上一些国家的听力保护噪声标准的最大值。我国卫生部和国家劳动总局1980年颁发的《工业企业噪声卫生标准》(试行草案)规定,新企业人耳位置允许噪声标准是:在噪声环境下工作时间4小时,其噪声应不超过88dB(A);8小时—85dB(A)。当前建设部正在酝酿修订标准,拟将搅拌机噪声标准修
Concrete mixers have always been a common type of construction machinery with relatively noisy noise. Their working noise is often one of the main sources of noise pollution in local areas. In the past, the concrete mixing standard stipulated that the noise of the operator’s human ear should not exceed 90dB (A). This value has reached the maximum hearing protection noise standard in some countries in the world. China’s Ministry of Health and the State Labor General Administration issued in 1980 the “Sanitary Standards for Noise in Industrial Enterprises” (protocol draft), which stipulates that the new company’s ear noise allowable standard is: In a noisy environment, the working time is 4 hours, and the noise should not exceed 88dB ( A); 8 hours - 85dB (A). The Ministry of Construction currently brewing revised standards and proposes to standardize mixer noise