Research On Layout Optimization Of Double Tower Cranes In Prefabricated Buildings

With the overall development of building industrialization in my country and the vigorous promotion of prefabricated buildings,tower cranes have been widely used as important prefabricated component hoisting and transportation equipment in prefabricated building construction.With the increase in the scale of prefabricated buildings and the acceleration of construction progress,a single tower crane is often difficult to meet the construction needs,and it is necessary to invest in a tower crane group to complete the hoisting work.The selection and layout decisions of the applicable tower crane group can be improved Construction efficiency,reduce construction costs.Based on the above background,the paper takes the double tower cranes as an important part of the tower crane group as the research object,and optimizes the selection and layout of the double tower cranes in the construction of prefabricated buildings.The main research process and results are as follows:(1)Through literature research and field investigation,the main research methods and optimization goals of the selection and layout of tower cranes are systematically sorted out,as well as the basic principles and main influencing factors of the selection and layout of tower cranes in construction,which are the establishment of mathematical models.Provide a theoretical basis;(2)Based on the mathematical relationship between the layout position of the tower crane and the quality of the prefabricated components,the location of the yard,and the installation position,a mathematical model of the feasible layout area of the double tower cranes is established.A solution algorithm was designed for the model,and the programming development was completed on the Matlab platform,which was verified by a calculation example.Studies have shown that when the location of the prefabricated component yard is determined,the feasible layout area of the double tower cranes increases first and then decreases with the increase of the tower crane model;(3)Based on the optimization goal of the shortest hoisting time,a mathematical model for pre-allocation of double-tower crane hoisting tasks was established;based on the optimization goal of the least potential collision hazard,combined with the mathematical model of task pre-allocation,a double-tower crane task secondary assignment,namely safe hoisting,was established mathematical model.Corresponding solving algorithms are designed for the two mathematical models,and genetic algorithms are used to solve them.The programming development is completed on the Matlab platform,and the calculation examples are used for verification.Research shows that,compared with traditional task allocation schemes and hoisting schemes,the task preallocation mathematical model is beneficial to save hoisting time and balance the workload of double tower cranes;the safe hoisting mathematical model can minimize potential collision hazards for double tower cranes The hoisting path enables the double tower cranes to carry out hoisting operations at the same time;(4)Based on the optimization objectives such as the shortest hoisting time,the least use cost and the greatest value engineering coefficient,combined with the mathematical model of the feasible layout area of the double-tower crane,the mathematical model of task pre-allocation and the mathematical model of safe hoisting,the selection and layout of the double-tower crane was established Optimize the mathematical model.Corresponding solving algorithm was designed for the model,and the enumeration method was used to solve the problem.The programming development was completed on the Matlab platform,and the calculation examples were used for verification.Research shows that the more components that need to be hoisted,the larger the selection of the double tower cranes selection scheme,the more beneficial it is to improve construction efficiency and reduce construction costs;(5)Through the analysis of practical engineering cases,it is verified that the research results of this paper are feasible and effective for the selection and layout optimization of double tower crane;At the same time,the research shows that through the task allocation optimization and layout optimization of the double tower crane,under the same case background,the hoisting efficiency of the same type of double tower crane can reach more than twice that of the single tower crane,which has a good optimization effect.