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Optimizing work-rest schedule for construction rebar workers in hot and humid environment

机译：在炎热和潮湿的环境中优化建筑钢筋工人的休息时间计划

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摘要

Heat stress, having physiological effects on workers, can lead to reduction of work enthusiasm and productivity, increased incident rate, heat illness, and death. This paper aims to optimize the work-rest schedule for construction rebar workers in hot and humid environment. Two objectives are addressed in the optimization process when such schedules are designed. These objectives include maximizing the labor productivity and minimizing the occurrence of heat stress on construction site. Field studies were conducted during the summer time in Hong Kong (July-September 2010-2011). The physiological conditions of rebar workers and environmental parameters of construction sites were measured and collated. Monte Carlo simulation technique was used to account for the uncertainties and variations of meteorological and physiological parameters during summer time in Hong Kong. On the basis of work-to-exhaustion-then-take-a-rest principle, an optimized work-rest schedule that maximizes productive time and at the same time safeguarding the health and safety of rebar workers is developed. An optimized schedule of having a 15 min break after working 120 min continuously in the morning (WBGT = 28.9 ± 1.3 ℃), and having a 20 min break after working 115 min continuously in the afternoon (WBGT = 32.1 ± 2.1 ℃) is proposed. The current study has contributed in providing an objective and scientific mechanism to optimize work-rest schedule which may benefit the industry to produce solid guidelines for working in hot weather.
机译：热应激会对工人产生生理影响，可导致工作热情和生产力下降，事故率增加，热病和死亡。本文旨在优化在炎热和潮湿环境下建筑钢筋工人的休息时间计划。设计此类计划时，在优化过程中要解决两个目标。这些目标包括最大程度地提高劳动生产率，并最大程度地减少建筑工地上的热应力。夏季（2010年7月至9月2011年）在香港进行了实地研究。测量和整理钢筋工人的生理状况和施工现场的环境参数。蒙特卡罗模拟技术用于解释香港夏季期间气象和生理参数的不确定性和变化。基于“劳累然后休息”的原则，开发了一种优化的工作休息时间表，该时间表可以最大程度地延长生产时间，同时又可以保护钢筋工人的健康和安全。提出了一个优化的时间表，建议在早上连续工作120分钟（WBGT = 28.9±1.3℃）后休息15分钟，在下午连续工作115分钟（WBGT = 32.1±2.1℃）之后休息20分钟。 。当前的研究为提供一个客观科学的机制来优化休息时间安排做出了贡献，这可能有益于行业制定在炎热天气下工作的可靠指南。

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