Modeling Analysis On The Integrated Construction Of "manufacture-transportation-assembly"

In recent years,the progress of science and technology and the rapid development of national economy have led to the rapid development of China's construction industry,and assembly buildings have been vigorously promoted by the government.Compared with the traditional construction mode,the assembly building with a construction mode of integrated "Manufacture-Transportation-Assembly" can effectively shorten the construction period,save a lot of water,wood and workload,and reduce a lot of construction waste,which is gradually considered as a more ecological and sustainable construction mode in large cities.However,the novel construction method was confronted with many problems during its application and implementation,which made it urgent to develop an integrated modeling research method to support the development of integrated "production-transportation-assembly" construction method.Due to its integration and systematicness,the traditional modeling research methods were faced with severe challenges.With the rapid development of computer technology,the field of assembly structure construction has also ushered in a wave of modeling calculation analysis and virtual simulation,which provides a new idea for the development of assembly structure and a strong support for the implementation of construction industry.On the basis of literature review and engineering practice,this paper points out the shortcomings of existing modeling methods in assembly structure system and the gaps of existing research.This paper first puts forward the modeling theory by integrating the production,transportation and field assembly as a whole.The whole process is modeled as a JIT-based single machine batch scheduling model to optimize the scheduling scheme in production stage,and it is proved that the model can be solved by dynamic programming algorithm.Secondly,the construction of a multi-objective cost optimization model based on time-dependence and batch scheduling idea is elaborated,where the influence of environmental and economic factors on the total cost is considered and quantified in the construction process of assembly structures.And it's proved that the model can be solved by polynomial time optimization algorithm.Then,the path planning algorithm is introduced into the construction process of assembly structure,and the process of modeling and optimizing the hoisting path of double tower cranes is described in detail.The theoretical method to solve the shortest hoisting path of double tower cranes based on geometric solution is proposed.In addition,the algorithm to find the shortest hoisting path is combined with the virtual hoisting simulation technology based on the Unity3 D platform to provide suggestions for the process control in the field construction of assembly structures.Finally,the modeling and theoretical solution processes of the shortest path optimization for double tower crane hoisting and the virtual hoisting simulation technology in the construction process of assembled structure are demonstrated through a case study of an assembled public rental housing.In this paper,the integrated modeling method of "production-transportation-assembly" is applied to the whole construction process of assembly building,which fully considers the different stakeholders for manufacturing,transportation and construction activities,and provides a new idea for modeling the process of component manufacturing production and field assembly.