Study On Construction Cost Risk Management Of Large Sea Crossing Bridge Project

With the rapid development of society,the pace of human exploration has shifted from land to ocean,and at the same time,the development of bridge construction has also shifted from crossing rivers and lakes to crossing bays and straits.Cross-sea bridges can better help residents on both sides of the strait communicate and exchange,and inject impetus into the economic take-off of both sides of the strait.It has also become a new research direction for bridge builders in my country and the world.The construction process of large-scale sea-crossing bridge projects has the characteristics of large investment,long construction period,harsh construction environment and high technical difficulty of construction,which makes the construction of large-scale sea-crossing bridge projects prone to construction cost overruns.Therefore,project managers must use advanced management concepts and management methods to implement effective cost risk control measures to ensure the realization of project cost objectives.This paper is mainly guided by the construction cost risk theory,through the analysis of the construction cost risk characteristics of large-scale sea-crossing bridge projects,using the literature method and expert consultation method to identify and screen out four aspects: technical factors,resource factors,management factors and environmental factors.Based on 17 risk factors,the TRME risk evaluation index system for the construction cost of large-scale bridges across the sea has been constructed.In order to conduct a more comprehensive evaluation of risks,this paper forms a WBS-RBS coupling matrix based on the Work Breakdown Structure(WBS)-Risk Breakdown Structure(RBS)method,establishes a TRME risk identification model for the construction cost of large-scale sea-crossing bridges,and uses the coupling matrix.It establishes a quantitative evaluation model of construction operation units,uses the AHP to quantitatively calculate the cost risk value of each construction operation unit,and evaluates its construction cost risk level;uses AHP-entropy weight combination to weight qualitative and quantitative,main The final weight is determined by objective combination,and finally the overall evaluation of the construction cost risk level of large-scale sea-crossing bridge projects is carried out by using the fuzzy comprehensive evaluation method.Finally,combined with the actual case of the Pingtan Strait Highway-Railway Bridge,the constructed evaluation model is verified,and the evaluation results are basically consistent with the actual situation,verifying its effectiveness and feasibility,and put forward some targeted measures,hoping to provide Provide reference and reference for the construction cost management of other similar marine environment engineering projects.