Research On Project Schedule Management Of Old Community Renovation Based On Critical Chain Method

With the acceleration of modern urban construction,the functions and living environment of cities have been greatly improved and gradually become smarter.However,many old and long-standing communities with outdated hardware conditions are still lagging behind.Outdated hardware facilities,narrow and damaged roads,aging electrical facilities,and old and dilapidated corridors have made it inconvenient for residents to live and even pose safety hazards,seriously affecting their normal lives.In recent years,the“renovation of old neighborhoods” has been implemented instead of the “renovation of shantytowns”.The “ Guiding Opinions on Comprehensively Promoting the Renovation of Urban Old Neighborhoods” clearly defines the target tasks and object scope of the renovation of urban old neighborhoods.The key issues of this article are how to transform old neighborhoods into qualified new ones,how to analyze and determine uncertain factors that affect neighborhood renovation,and how to solve the problems that affect the progress of neighborhood renovation and ensure that the project is completed on time by using optimized project schedule management methods.By reviewing existing literature,studying relevant theories and methods of schedule management,and applying relevant knowledge for in-depth research,this article found that the critical chain buffer method has certain advantages.Taking the CZ old community renovation project as an example,through case analysis,the factors that restrict the project schedule were identified,and solutions were adopted.By comparing the critical path method and the critical chain method,it was found that the critical chain method had better results and was more scientific,and was optimized based on the original critical chain method.First,the resource-constrained problem was solved by introducing the Pairwise Optimization Theory,adjusting the construction sequence of parallel activities based on the shortfall of pairs and the center of gravity of the activities to make better use of resources.Secondly,to reduce the influence of human factors,unnecessary objective safety time was reduced,and safety time was redefined.Combined with project experience,the difference between the most optimistic and the most pessimistic duration was used as the safety time for this work,which was more in line with reality.Thirdly,considering the uncertain factors that objectively exist in the project,the uncertainty coefficient C was introduced,and through the expert survey method,some experts and scholars in this industry were surveyed to determine five uncertain factors that are in line with the characteristics of the project.Then,the entropy weight TOPSIS method was used for data quantification and calculation to obtain a new critical chain technology model,which was added with a buffer zone,adjusted and optimized the critical chain,and set project buffers and junction buffers for critical and non-critical lines,respectively,to offset the impact of activity delays on the critical chain and project duration.Finally,combined with actual project management,a buffer zone monitoring mechanism was established,and targeted optimization measures were taken to provide a guarantee for completing the project on time.The Monte Carlo method was used for verification,and a simulation model was established using the Crystal Ball software to compare traditional project schedule management methods,proving that the critical chain method can effectively ensure the completion of the project on time.In the end,the duration of the CZ old community renovation project was 97 days,which was 9 days shorter than the duration calculated by the traditional method and 11 days shorter than the project-required duration,proving that the critical chain method has better practicality and feasibility in the renovation of old neighborhoods.