College of Built Environments, University of Washington, Seattle, WA 98105, USA.
Department of Construction Management, University of Washington, Seattle, WA 98195, USA.
Int J Environ Res Public Health. 2021 Feb 5;18(4):1510. doi: 10.3390/ijerph18041510.
Material-cart handling can be strenuous and lead to overexertion injuries. The aim of this study is to produce a thorough understanding of how the cart condition, tire type, physical environment-related factors, and load interact to influence the ergonomics and productivity of cart handling. Eighteen roofing carts with different conditions, tires, and loads were tested by one subject on three laboratory tracks: one L-shaped, one with ramps within constrained spaces, and one with obstacles within constrained spaces. A multiple linear regression analysis was performed to quantify the main and interaction effects of the factors of interest on the cart operations. The research findings confirm that using aged carts increases the injury risk by as much as 30.5% and decreases productivity by 35.4%. Our study also highlights the necessity of keeping an open space for cart operation; the travel distance from a cart to a ramp/obstacle should be greater than 61 cm. Finally, the results suggest the at-risk thresholds for different ramp slopes and obstacle heights, and the safe load capacities for the various working circumstances that are common on construction sites. The evidence created in this study can be translated into administrative controls for cart handling to reduce overexertion injuries and enhance performance.
物料手推车搬运可能很费力，容易导致过度用力损伤。本研究旨在深入了解手推车状况、轮胎类型、与物理环境相关的因素以及负载如何相互作用，从而影响手推车搬运的人体工程学和效率。一位受试者在三个实验室轨道上测试了 18 辆具有不同条件、轮胎和负载的屋顶手推车：一个 L 形轨道、一个在有限空间内有斜坡的轨道，和一个在有限空间内有障碍物的轨道。进行了多元线性回归分析，以量化感兴趣因素在手推车操作中的主要和交互作用。研究结果证实，使用老化的手推车会使受伤风险增加高达 30.5%，并使效率降低 35.4%。我们的研究还强调了保持手推车操作空间开阔的必要性；手推车到斜坡/障碍物的行驶距离应大于 61 厘米。最后，结果表明了不同斜坡坡度和障碍物高度的风险阈值，以及建筑工地常见的各种工作情况下的安全负载能力。本研究中创建的证据可以转化为手推车搬运的管理控制措施，以减少过度用力损伤并提高性能。
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