Abstract

For decades construction labour productivity has been stagnated or declining. Changing this issue requires new knowledge on the labour-intensive construction production system. The work sampling method was applied to collect data from three renovation construction production systems. It quantifies observations of on-site work and enables deep analyses of how time is used. The analysis revealed that the renovation projects had a baseline of value-adding-work (VAW) time on 29.5%. It further identified five system behaviours outlining how VAW and Non-Value-Adding work (NVAW) time behaves. The new knowledge of how both VAW and NVAW time behaves advances knowledge on how time is wasted in construction projects and opens new branches of future research. The findings are furthermore of potential use to industry professionals who work with process improvement in renovation projects because they provide, among others, answers to how targets can be defined for both VAW and NVAW.

摘要

几十年来，建筑劳动生产率一直停滞不前或下降。改变这个问题需要对劳动密集型建筑生产系统有新的认识。采用工作抽样方法从三个改造施工生产系统中收集数据。它量化了对现场工作的观察，并能够深入分析时间的使用方式。分析显示，改造项目的增值工作（VAW）时间基线为 29.5%。它进一步确定了五种系统行为，概述了 VAW 和非增值工作 (NVAW) 时间的行为方式。关于 VAW 和 NVAW 时间如何表现的新知识提高了关于如何在建设项目中浪费时间的知识，并开辟了未来研究的新分支。