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首页> 外文期刊>American Journal of Civil Engineering and Architecture >Factors Affecting Upstream Production Rate and Causing Reworks in Downstream Activities due to Activities Overlapping
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Factors Affecting Upstream Production Rate and Causing Reworks in Downstream Activities due to Activities Overlapping

机译：影响上游生产率的因素，并导致下游活动返工导致的活动重叠

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摘要

Overlapping (or fast tracking) is a schedule compression technique in which phases or activities normally performed in sequence are performed in parallel, PMI, [1]. Rework has both direct and indirect effects on the performance of construction projects. The direct effect of the impact of rework are: additional time for rework, additional costs of rework, additional materials spent on rework and control next waste, additional labor for rework, difficulty of managing resources. To reduce the impact of reworks there is a need to understand their basic reason for their existence or set of conditions that stimulate their occurrence in a building process. This paper aims to identify the top important changes that affecting upstream production rate and causing reworks in downstream activities. These changes were identified through three stages. The first stage twenty three changes which causing reworks in downstream activities were collected from past literature review and were divided into three major categories: designer, contractor and owner changes. One hundred effective interviews were conducted and their results are employed. The second stage, the twenty three changes were then ranked from the most significant to the less significant. The third stage, the 80/20 rule applied to the changes identified to get the eight most important changes that represented about 25% of the causes. The result shows the top important eight factors which were considered as the factors affecting upstream production rate and causing reworks in downstream activities as follows: 1) Lack of coordination and poor communication, 2) The contractor instruction to modify a design, 3) Non-compliance with specification, 4) The owner instruction to modify a design, 5) Incomplete design at the time of tender, 6) Poor planning and coordination of resources, 7) Errors made in the contract documentation and 8) Lack of experience and knowledge of the design and construction process.
机译：重叠（或快速跟踪）是一种调度压缩技术，其中通常按顺序执行的相位或活动并联，PMI，[1]。返工对建筑项目的表现直接和间接影响。返工的影响的直接影响是：返工的额外时间，返工的额外费用，在返工和控制下一个浪费的额外材料，额外的薪水劳动，管理资源的难度。为了减少返工的影响，需要了解他们存在的基本原因，刺激其在建筑过程中的发生。本文旨在确定影响上游生产率并导致下游活动返工的最重要变化。这些变化通过三个阶段来确定。从过去的文献综述中收集了造成下游活动返工的第一阶段的二十三个变化，并分为三大类：设计师，承包商和所有者的变化。进行了一百有效的面试，并采用了结果。第二阶段，二十三种变化然后从最重要的排名不太重要。第三阶段，80/20规则适用于确定的变化，以获得约占原因的大约25％的最重要变化。结果表明，最重要的八个因素被认为是影响上游生产率的因素，并导致下游活动的返工如下：1）缺乏协调和沟通不良，2）承包商指导修改设计，3）非遵守规范，4）所有者指示在招标时修改设计，5）设计，6）资源规划差，7）合同文件中的错误和8）缺乏经验和知识设计与施工过程。

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