In this paper,the intelligent construction of prefabricated components is analyzed based on building information modeling(BIM).It includes an overview of BIM-based prefabricated components and intelligent construction...In this paper,the intelligent construction of prefabricated components is analyzed based on building information modeling(BIM).It includes an overview of BIM-based prefabricated components and intelligent construction,intelligent production lines in BIM-based intelligent construction systems,and analysis of the application of intelligent manufacturing in BIM-based prefabricated components.It was found that the determination of construction goals,the establishment of intelligent construction systems,and the application of intelligent construction systems are all areas that need to be emphasized in producing prefabricated building components through intelligent construction.It is hoped that this analysis can provide some reference for the application of intelligent construction and the improvement of the quality of prefabricated building components.展开更多
The measures of steam curing and early-strengthening agents to promote the precast components to reach the target strength quickly can bring different degrees of damage to the concrete.Based on this,the new nanomateri...The measures of steam curing and early-strengthening agents to promote the precast components to reach the target strength quickly can bring different degrees of damage to the concrete.Based on this,the new nanomaterial CSH-the hydration product of cement effectively solves these measures’disadvantages,such as excessive energy consumption,thermal stress damage,and the introduction of external ions.In this paper,the effect of CSH on the early strength of precast fly ash concrete components was investigated in terms of setting time,workability,and mechanical properties and analyzed at the microscopic level using hydration temperature,XRD,and SEM.The results showed that under the same workability,CSH could significantly reduce the amount of admixture,shorten the final setting time,almost not affect the initial setting time,and accelerate the hydration of cement.At the optimum dose of 5%,the mechanical properties of the specimens were improved by more than 98%within 12 h of hydration,resulting in an earlier release time of 12 h and no risk of strength inversion later.The results of this paper give theoretical support to the behavior of precast components under steam-free curing.展开更多
With the continuous development of prefabricated buildings, more and more residential projects adopt prefabricated buildings, prefabricated buildings have the advantages of enhancing the industrialization level of con...With the continuous development of prefabricated buildings, more and more residential projects adopt prefabricated buildings, prefabricated buildings have the advantages of enhancing the industrialization level of construction, improving quality and efficiency, improving building quality and so on. The roughening treatment of prefabricated component binding surface is one of the important processes of prefabricated construction, which has a direct impact on the bearing capacity of the component binding surface. Based on the trial of practical projects, comparing the characteristics of several different combined surface treatment processes, this paper studies and analyzes the applicability of the roughening treatment process of PE film forming prefabricated members in practical projects, so as to provide theoretical basis for deepening the development concept of energy conservation, emission reduction and quality and efficiency improvement of prefabricated buildings.展开更多
Construction site layout planning(CSLP)involves strategically placing various facilities to optimize a project.However,real construction sites are complex,making it challenging to consider all construction activities ...Construction site layout planning(CSLP)involves strategically placing various facilities to optimize a project.However,real construction sites are complex,making it challenging to consider all construction activities and facilities comprehensively.Addressing multi-objective layout optimization is crucial for CSLP.Previous optimization results often lacked precision,imposed stringent boundary constraints,and had limited applications in prefabricated construction.Traditional heuristic algorithms still require improvements in region search strategies and computational efficiency when tackling multi-objective optimization problems.This paper optimizes the prefabricated component construction site layout planning(PCCSLP)by treating construction efficiency and safety risk as objectives within a multi-objective CSLP model.A novel heuristic algorithm,the Hybrid Multi-Strategy Improvement Dung Beetle Optimizer(HMSIDBO),was applied to solve the model due to its balanced capabilities in global exploration and local development.The practicality and effectiveness of this approach were validated through a case study in prefabricated residential construction.The research findings indicate that the HMSIDBO-PCCSLP optimization scheme improved each objective by 18%to 75%compared to the original layout.Compared to Genetic Algorithm(GA),the HMSIDBO demonstrates significantly faster computational speed and higher resolution accuracy.Additionally,in comparison with the Dung Beetle Optimizer(DBO),Particle Swarm Optimization(PSO),and Whale Optimization Algorithm(WOA),HMSIDBO exhibits superior iterative speed and an enhanced ability for global exploration.This paper completes the framework from data collection to multi-objective optimization in-site layout,laying the foundation for implementing intelligent construction site layout practices.展开更多
文摘In this paper,the intelligent construction of prefabricated components is analyzed based on building information modeling(BIM).It includes an overview of BIM-based prefabricated components and intelligent construction,intelligent production lines in BIM-based intelligent construction systems,and analysis of the application of intelligent manufacturing in BIM-based prefabricated components.It was found that the determination of construction goals,the establishment of intelligent construction systems,and the application of intelligent construction systems are all areas that need to be emphasized in producing prefabricated building components through intelligent construction.It is hoped that this analysis can provide some reference for the application of intelligent construction and the improvement of the quality of prefabricated building components.
文摘The measures of steam curing and early-strengthening agents to promote the precast components to reach the target strength quickly can bring different degrees of damage to the concrete.Based on this,the new nanomaterial CSH-the hydration product of cement effectively solves these measures’disadvantages,such as excessive energy consumption,thermal stress damage,and the introduction of external ions.In this paper,the effect of CSH on the early strength of precast fly ash concrete components was investigated in terms of setting time,workability,and mechanical properties and analyzed at the microscopic level using hydration temperature,XRD,and SEM.The results showed that under the same workability,CSH could significantly reduce the amount of admixture,shorten the final setting time,almost not affect the initial setting time,and accelerate the hydration of cement.At the optimum dose of 5%,the mechanical properties of the specimens were improved by more than 98%within 12 h of hydration,resulting in an earlier release time of 12 h and no risk of strength inversion later.The results of this paper give theoretical support to the behavior of precast components under steam-free curing.
文摘With the continuous development of prefabricated buildings, more and more residential projects adopt prefabricated buildings, prefabricated buildings have the advantages of enhancing the industrialization level of construction, improving quality and efficiency, improving building quality and so on. The roughening treatment of prefabricated component binding surface is one of the important processes of prefabricated construction, which has a direct impact on the bearing capacity of the component binding surface. Based on the trial of practical projects, comparing the characteristics of several different combined surface treatment processes, this paper studies and analyzes the applicability of the roughening treatment process of PE film forming prefabricated members in practical projects, so as to provide theoretical basis for deepening the development concept of energy conservation, emission reduction and quality and efficiency improvement of prefabricated buildings.
基金supported by the National Key R&D projects(Grant No.2018YFC0704301)Science and Technology Project of Wuhan Urban and Rural Construction Bureau,China(201943)+2 种基金Research on theory and application of prefabricated building construction management(20201h0439)Wuhan Modou Construction Consulting Co.,Ltd.(20201h0414)Preliminary Study on the Preparation of the 14th Five-Year Plan for Housing and Urban-Rural Development in Hubei Province,China(20202s002).
文摘Construction site layout planning(CSLP)involves strategically placing various facilities to optimize a project.However,real construction sites are complex,making it challenging to consider all construction activities and facilities comprehensively.Addressing multi-objective layout optimization is crucial for CSLP.Previous optimization results often lacked precision,imposed stringent boundary constraints,and had limited applications in prefabricated construction.Traditional heuristic algorithms still require improvements in region search strategies and computational efficiency when tackling multi-objective optimization problems.This paper optimizes the prefabricated component construction site layout planning(PCCSLP)by treating construction efficiency and safety risk as objectives within a multi-objective CSLP model.A novel heuristic algorithm,the Hybrid Multi-Strategy Improvement Dung Beetle Optimizer(HMSIDBO),was applied to solve the model due to its balanced capabilities in global exploration and local development.The practicality and effectiveness of this approach were validated through a case study in prefabricated residential construction.The research findings indicate that the HMSIDBO-PCCSLP optimization scheme improved each objective by 18%to 75%compared to the original layout.Compared to Genetic Algorithm(GA),the HMSIDBO demonstrates significantly faster computational speed and higher resolution accuracy.Additionally,in comparison with the Dung Beetle Optimizer(DBO),Particle Swarm Optimization(PSO),and Whale Optimization Algorithm(WOA),HMSIDBO exhibits superior iterative speed and an enhanced ability for global exploration.This paper completes the framework from data collection to multi-objective optimization in-site layout,laying the foundation for implementing intelligent construction site layout practices.
