Research On Optimization Of Critical Chain Technology Schedule Based On Improved PERT

Project management mainly includes schedule management,risk management,cost management,quality management,etc.Among them,schedule management is one of the important indicators to measure the level of project management.With the rapid development of the country’s urbanization process,the number and scale of engineering projects have increased.Based on this,the risk factors and uncertainties faced by engineering projects in the implementation process have also increased.In view of the current situation of the common problems of schedule overdue and resource conflict in project schedule management,how to conduct schedule management scientifically and rationally has become an important task in the process of project management.Critical chain technology happens to have significant advantages in shortening the construction period and resolving resource conflicts,so it has far-reaching significance for the research of critical chain technology.This article mainly studies the critical chain technology from three aspects:critical chain identification,buffer setting and buffer monitoring.(1)The basis of critical chain identification is a reasonable estimate of the process duration.This paper introduces the concept of fuzzy theory on the basis of the three-point time estimation method,points out six uncertain factors that affect the estimation of construction period,and quantifies and assigns weights to them respectively.On the basis of fuzzy theory,it defines the formula for the expected value of triangular fuzzy variables,and calculates the fuzzy duration value.It uses the key probability value of each process to identify the critical path more reasonably.On the basis of the critical path,the critical chain can be identified by using the critical chain identification model proposed in this paper to eliminate the impact of resource.(2)Setting the buffer zone is the core and focus of the Critical chain technology conflicts.This paper introduces the concept of information entropy to measure the factors that affect the size of the buffer.These factors are combined with the defined decision-makers’ preference factors to improve the calculation formula of the root variance method.The improved calculation formula considers more influencing factors.Therefore,the calculation result is more realistic.(3)A good schedule is inseparable from scientific and effective monitoring and management.The critical chain technology transforms the monitoring and management of the entire project into the monitoring of the buffer usage.According to the progress of the project,this article dynamically allocates the buffer to each process.By setting trigger points on the process,it is determined whether to start the buffer monitoring model set by the progress control matrix,so as to achieve reasonable monitoring of the entire project.Finally,it is selected as the research object abort an engineering example of a high-rise commercial building in Jiangxi Province,and the critical chain schedule management model established in this paper is used for example verification.The improved critical chain schedule management model and the traditional schedule management model were simulated using Crystal Ball software.It proves the practicality of the schedule management model established in this paper.This method makes up for the limitations of traditional methods.It provides a good idea for improving the level of project schedule management.