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Determining an optimal recovery time for construction rebar workers after working to exhaustion in a hot and humid environment

机译：确定在炎热潮湿的环境中工作后筋疲力尽的建筑钢筋工人的最佳恢复时间

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摘要

This paper is an extension to a paper previously published in the journal Building and Environment. Having determined an optimal recovery time in a controlled climatic environment, this paper aims to investigate the real impact on construction rebar workers by replicating the clinical experimentation to a series of field studies. Field studies were conducted during the summer time in Hong Kong. Nineteen rebar workers performed tasks of fixing and bending steel reinforcement bars on two building construction sites until voluntary exhaustion and were allowed to recover on site until their physiological conditions returned to the pre-work level or lower. Physiological Strain Index (PSI) was used as a yardstick to determine the rate of recovery. A total of 411 sets of meteorological and physiological data collected over fourteen working days between July and August of 2011 were collated to derive the optimal recovery time. It was found that on average a rebar worker could achieve 94% recovery in 40 min; 93% in 35 min; 92% in 30 min; 88% in 25 min; 84% in 20 min; 78% in 15 min; 68% in 10 min; and 58% in 5 min. Curve estimation results showed that recovery time is a significant variable to predict the rate of recovery (R2 = 0.99, P < 0.05). Additional rest times should be introduced between works in extreme hot weather to enable workers to recover from heat stress. Frequency and duration of each rest time should be agreed among different stakeholders based on the cumulative recovery curve.
机译：本文是对先前发表在《建筑与环境》杂志上的论文的扩展。确定了在受控气候环境下的最佳恢复时间后，本文旨在通过将临床实验复制到一系列现场研究中，研究对建筑钢筋工人的实际影响。夏季在香港进行了实地研究。 19名钢筋工人在两个建筑工地上执行了固定和弯曲钢筋的任务，直到自愿耗尽为止，并被允许在现场恢复工作，直到他们的生理状况恢复到工作前的水平或更低。生理应变指数（PSI）被用作衡量恢复率的标准。在2011年7月至8月的14个工作日内，共收集了411套气象和生理数据，以得出最佳恢复时间。结果发现，平均而言，螺纹钢工人在40分钟内可达到94％的恢复率。 35分钟内达到93％； 30分钟内达到92％； 25分钟内达到88％； 20分钟内达到84％； 15分钟内达到78％； 10分钟内达到68％； 5分钟内达到58％。曲线估计结果表明，恢复时间是预测恢复率的重要变量（R2 = 0.99，P <0.05）。在极端高温天气下，应在工作之间增加额外的休息时间，以使工人从热压力中恢复过来。每个休息时间的频率和持续时间应根据累积恢复曲线在不同利益相关方之间达成一致。

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  • 来源
    《Building and Environment》 |2012年第12期|p.163-171|共9页
  • 作者

    Albert P.C. Chan; Wen Yi; Del P. Wong; Michael C.H. Yam; Daniel W.M. Chan;

  • 作者单位

    Department of Building and Real Estate, The Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong, China;

    Department of Building and Real Estate, The Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong, China;

    Faculty of Management and Hospitality, The Technological and Higher Education Institute of Hong Kong, Hong Kong, China;

    Department of Building and Real Estate, The Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong, China;

    Department of Building and Real Estate, The Hong Kong Polytechnic University, Hung Horn, Kowloon, Hong Kong, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heat stress; physiological strain index (PSI); heat tolerance time; field studies; rebar workers; rest time;

    机译：热应激;生理应变指数（PSI）;耐热时间;实地研究;钢筋工人;休息时间;

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