摘要
针对传统的以关键路径法建立的项目进度控制模型在实际的施工过程中可能存在工期延误、资源冲突等问题,以盐环定扬黄工程梯级泵站系统更新改造项目为研究对象,在传统关键路径法的基础上,将约束理论的核心引入关键链理论中,在项目进度计划制定时将工序之间的资源约束、逻辑关系和工序持续时间提升到同等高度,通过工序之间的逻辑关系调整资源利用的优先级,避免不同工序在施工过程中的资源冲突;在缓冲区计算中以传统三点估计法为基础引入位置权数和弹性模量,合理消除工序持续时间中的多余安全时间,进而在不同位置设置汇入缓冲量和项目缓冲量,最后构建基于关键链技术的项目进度控制模型。结果表明,相比传统的由关键路径法建立的进度管理模型,以关键链技术为基础建立的项目进度管理模型在具体的施工过程中,工序之间资源调配更合理有序,工序持续时间更短,项目总工期由原来的460 d缩短到315 d,表明所建模型在梯级泵站更新改造进度控制中是有效且可行的。
In the actual construction process,the project progress control model established by the critical path method may have problems such as delays in construction period and resource conflicts.This paper takes the renovation project of the cascade pumping station system of Yanhuanding Yanghuang Project as the research object.On the basis of the traditional critical path method,the core of the constraint theory(that is,the progress management of the project from the perspective of the maximum output of the system)is introduced into the key chain theory,and the resource constraints between the processes are formulated when the project schedule is formulated.The logical relationship and process duration are raised to the same height,and the priority of resource utilization is adjusted through the logical relationship between processes to avoid resource conflicts in different processes during construction;in the buffer calculation,based on the traditional three-point estimation method The position weight and the elastic modulus reasonably eliminate the redundant safety time in the process duration,and then set the import buffer amount and the project buffer amount in different positions.Finally,the project schedule control model based on the critical chain technology is constructed.The results show that compared with the traditional schedule management model established by the critical path method,the project schedule management model based on the critical chain technology is more reasonable and orderly in the specific construction process,and the process duration is more Short,the total project duration is shortened from 460d to 315d,indicating that the model is effective and feasible in the progress control of the cascade pump station.
作者
朱兴林
张浩然
王徐洋
ZHU Xing-lin;ZHANG Hao-ran;WANG Xu-yang(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)
出处
《水利科技与经济》
2019年第11期18-25,共8页
Water Conservancy Science and Technology and Economy
关键词
关键链技术
缓冲区
进度控制
梯级泵站
Critical chain technology
buffer zone
schedule control
cascade pumping station
