Economic Comparison And Risk Assessment Of Prefabricated Assembly Bridge Pier Construction

The green,fast and efficient construction concept in bridge pier is now the main goal of the bridge engineering community.In this paper,the research on the construction technology,economy and safety risk assessment of the prefabricated piers with grouted sleeves is made in order to show that the construction technology of prefabricated piers with grouting sleeves is advantage in green,convenient,fast construction.(1)In this paper,a proposed simple supported bridge project was taken as engineering background.For a large number of piers,the optimal construction scheme should be selected between the assembly-type construction and the cast-in-place construction.By comparing the economic cost of construction with the engineering quantity calculation of the assembly type construction and the on-site construction method,the construction cost model was proposed,the best construction technology can be selected according to the scale of the construction project.After comparing the appropriate construction cost,the construction technology of assembled piers can be selected appropriately.(2)The construction process of the grouting sleeve prefabricated piers was introduced,and the safety assessment model was established by using the analytic hierarchy process together with the fuzzy comprehensive evaluation method to evaluate the safety of the grouting sleeve assembly-type construction and find out the main risk in the assembly construction technology factor.The main risk in assembly-type construction is that the construction of sleeve grouting is not dense.(3)A new type of grouting sleeve,which can be checked and re-grouted was proposed to solve the construction problems,and three-dimensional drawing of the new type of sleeve was built using Revit software to show intuitive appearance characteristics clearly.The purpose of this paper is to show that for the simple-supported bridge pier construction projects,the preferential assembly-oriented construction is a preferred option in some cases.Through the safety analysis,the feasibility of the construction is proved and the high risk factors can be controlled with the new checkable sleeve couple.