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Abstract：
Lean management is a strategic approach that is used in construction industry, specifically aims at minimizing and ultimately eliminating non-value-adding activities, commonly referred to as waste, within construction projects. However, an increase in non-value added (NVA) activities within the precast industry has the potential to diminish both productivity and efficiency. The aim of this paper is to investigate the use of lean tools for minimizing NVA activities in the construction industry. A comprehensive literature review, the study identified Unnecessary Inventory (UI), Waiting Time (WT), Overproduction (OP), and Unnecessary Movement (UM) as major NVA activities that affect the precast industry. A structured questionnaire was designed and conducted among precast industry professionals and lean experts to collect data. The data was then analyze using partial least square test-structural equation modelling, including reliability and validity tests, to ensure data quality. Results indicated that the precast industry professionals widely utilized Just-in-time (JIT), Continuous Improvement (CI), and Total Quality Management (TQM) as lean tools to reduce NVA activities. A conceptual path model was developed to assess the impact of Lean tools on NVA activities. The results of the analysis reveal a strong positive relationship between Lean tools and NVA activities, with a β value of 0.654. The findings of this study can be used for improving the productivity of construction projects by focusing on how to minimize NVA activities using lean tools in precast industry.
摘要：
精益管理是建筑行业采用的一种战略方针,具体旨在尽量减少并最终消除非增值活动，通常被称为废物，在建设项目内。然而,预制行业内非增值（NVA）活动的增加有可能降低生产率和效率。本文的目的是研究如何使用精益工具来最大程度地减少建筑行业的NVA活动。全面的文献综述，这项研究确定了不必要的库存(UI)，等待时间(WT),生产过剩(OP)，和不必要的运动（UM）作为影响预制行业的主要NVA活动。设计了结构化问卷，并在预制行业专业人士和精益专家中进行了问卷调查，以收集数据。然后使用偏最小二乘检验-结构方程模型对数据进行分析，包括信度和效度测试，确保数据质量。结果表明，预制行业专业人员广泛使用实时(JIT)，持续改进(CI)和全面质量管理（TQM）作为减少NVA活动的精益工具。开发了概念路径模型来评估精益工具对NVA活动的影响。分析结果表明，精益工具与NVA活动之间存在很强的正相关关系，β值为0.654。通过关注如何在预制行业中使用精益工具来最大程度地减少NVA活动，这项研究的结果可用于提高建筑项目的生产率。
