Task-specific noise exposure during manual concrete surface grinding in enclosed areas-influence of operation variables and dust control methods.
Task-specific noise exposure during manual concrete surface grinding in enclosed areas-influence of operation variables and dust control methods.
复制标题
封闭区域手动混凝土表面打磨过程中特定任务噪声暴露——操作变量和粉尘控制方法的影响。
DOI：
10.1080/15459624.2013.818230
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发表时间：
2013
影响因子：
2
通讯作者：
Akbar-Khanzadeh,Mahboubeh
中科院分区：
文献类型：
--
作者：
Akbar-Khanzadeh,Farhang;Ames,AprilL;Milz,SherylA;Akbar-Khanzadeh,Mahboubeh
在手持混凝土研磨活动中，噪声暴露是一种明显的危险，其评估具有挑战性，因为涉及的变量很多。噪声剂量计被用来检查在混凝土研磨过程中使用不同的研磨机尺寸、类型、附件和可用的粉尘控制方法进行混凝土研磨时个人噪声暴露的程度。噪声监测在一个封闭的区域内进行，涵盖52个特定任务的研磨过程，持续时间为6至72分钟。混凝土粉磨过程中的噪声水平，无论是分钟平均噪声水平(Lavg，dBA)还是分钟峰值(Dbc)，与一般通风(GV：开、关)、粉尘控制方法(未控制、湿、Shop-Vac、HEPA、HEPA-旋风)、4英寸(100 Mm)、5英寸(125 Mm)和6英寸(150 Mm)的研磨杯轮(刀片)尺寸以及表面取向(水平、倾斜)显著相关(P<；0.01)。总体而言，磨削过程中的分钟平均Lavg为97.0±3.3(平均±SD)，范围为87.9~113。无控制研磨和湿法研磨时的微小Lavg水平(98.9±5.2)和(98.5±2.7)显著高于局部排气(LEV)研磨时的(96.2±2.8)。6英寸杯形砂轮产生的噪声水平(98.7±2.8)显著高于5英寸(96.3±3.2)和4英寸(95.3±3.5)杯形砂轮。磨削过程中的微小峰值噪声水平(DBC)为113±5.2，范围为104~153。无控制磨削时的微小峰值噪声水平(119±10.2)显著高于湿式磨削(115±4.5)和水平磨削(112±3.4)。6英寸杯形砂轮产生的微小峰值噪声水平(115±5.3)显著高于5英寸(112±4.5)和4英寸(111±5.4)杯形砂轮。假设轮班工作8小时，结果表明，封闭区域混凝土研磨过程中的噪声暴露水平超过了推荐的允许暴露限值，工人应该受到工程控制方法、安全工作实践和/或个人防护设备的保护。
Noise exposure is a distinct hazard during hand-held concrete grinding activities, and its assessment is challenging because of the many variables involved. Noise dosimeters were used to examine the extent of personal noise exposure while concrete grinding was performed with a variety of grinder sizes, types, accessories, and available dust control methods. Noise monitoring was conducted in an enclosed area covering 52 task-specific grinding sessions lasting from 6 to 72 minutes. Noise levels, either in minute average noise level (Lavg, dBA) or in minute peak (dBC), during concrete grinding were significantly (P < 0.01) correlated with general ventilation (GV: on, off), dust control methods (uncontrolled, wet, Shop-Vac, HEPA, HEPA-Cyclone), grinding cup wheel (blade) sizes of 4-inch (100 mm), 5-inch (125 mm) and 6-inch (150 mm), and surface orientation (horizontal, inclined). Overall, minute Lavg during grinding was 97.0 ± 3.3 (mean ± SD), ranging from 87.9 to 113. The levels of minute Lavg during uncontrolled grinding (98.9 ± 5.2) or wet-grinding (98.5 ± 2.7) were significantly higher than those during local exhaust ventilation (LEV) grinding (96.2 ± 2.8). A 6-inch grinding cup wheel generated significantly higher noise levels (98.7 ± 2.8) than 5-inch (96.3 ± 3.2) or 4-inch (95.3 ± 3.5) cup wheels. The minute peak noise levels (dBC) during grinding was 113 ± 5.2 ranging from 104 to 153. The minute peak noise levels during uncontrolled grinding (119 ± 10.2) were significantly higher than those during wet-grinding (115 ± 4.5) and LEV-grinding (112 ± 3.4). A 6-inch grinding cup wheel generated significantly higher minute peak noise levels (115 ± 5.3) than 5-inch (112 ± 4.5) or 4-inch (111 ± 5.4) cup wheels. Assuming an 8-hour work shift, the results indicated that noise exposure levels during concrete grinding in enclosed areas exceeded the recommended permissible exposure limits and workers should be protected by engineering control methods, safe work practices, and/or personal protective devices.