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 measurement and calculation of the carbon emission from the production of prefabricated building components were studied.Based on the carbon emission factor method,a carbon emission calculation model of the compon...The measurement and calculation of the carbon emission from the production of prefabricated building components were studied.Based on the carbon emission factor method,a carbon emission calculation model of the components in the production phase was established.Besides,the actual measurement method and calculated at rated power method were proposed for the measurement and calculation of carbon emission,and several measurements were carried out in a component factory located in a coastal area of south China and a component factory located in Beijing,respectively.The results of the study show that the carbon emission factors of laminates and wallboards produced by factories located in coastal areas of southern China under natural curing conditions were 7.61 kg CO2/m3 and 5.84 kg CO2/m3 respectively.The carbon emissions conversion coefficients of concrete mixer,reinforcing bar production line and travelling crane between actual operation and with per the rated power were approximately 0.44,0.34 and 0.34 respectively.When the actual measurement cannot be performed,the conversion coefficient can be used to correct the data of the calculated at rated power to make it closer to the true value.The carbon emission factor of the laminated panels produced by the component factory in Beijing under steam curing concrete conditions was 132.15 kg CO2/m3,and the factory is used as a prototype,a complementary steam generation system model of solar energy and boiler was established,and it was calculated that the system can reduce CO2 emissions by about 300 tons throughout the year.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
近年来,轻钢装配式建筑因施工便捷、环境效益高等优势,大量应用于工程实践,有很好的应用前景。而由于传统暖通空调设计方法导致的后续施工会二次破坏建筑构件,传统暖通空调设计方法已不适用于轻钢装配式建筑。目前,针对暖通空调与轻钢...近年来,轻钢装配式建筑因施工便捷、环境效益高等优势,大量应用于工程实践,有很好的应用前景。而由于传统暖通空调设计方法导致的后续施工会二次破坏建筑构件,传统暖通空调设计方法已不适用于轻钢装配式建筑。目前,针对暖通空调与轻钢装配式建筑融合发展的研究与应用相对较少,为填补该领域的空白,提出了一种暖通空调系统(以多联机为例)与轻钢装配式建筑一体化设计新方法IB-VRV(variable refrigerant volume air conditioner integrating with buildings)。探究了适用于传统建筑的暖通空调设计方法与适用于轻钢装配式建筑的暖通空调设计方法的差异。并根据这两种暖通空调设计方法的差异,在现有传统暖通空调设计理念的基础上,凝练出暖通空调系统与轻钢装配式建筑融合发展三项原则。这三项融合原则分别为结构安全优先、非同寿命周期和功能区弹性化原则。基于上述三原则,进一步提出暖通空调系统与轻钢装配式建筑融合新方式,并以多联机系统为案例展开深入分析。研究结果表明,所提出的IB-VRV能够弥补传统暖通空调设计方法应用于轻钢装配式建筑的不足,并能充分发挥轻钢装配式建筑自重轻、结构简单、构件小可暗装等优势。该研究为暖通空调系统与其他类型装配式建筑一体化设计开拓了思路,奠定了理论基础。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.
基金This work was financially supported by National Key R&D Plan(2016YFC0701807).
文摘The measurement and calculation of the carbon emission from the production of prefabricated building components were studied.Based on the carbon emission factor method,a carbon emission calculation model of the components in the production phase was established.Besides,the actual measurement method and calculated at rated power method were proposed for the measurement and calculation of carbon emission,and several measurements were carried out in a component factory located in a coastal area of south China and a component factory located in Beijing,respectively.The results of the study show that the carbon emission factors of laminates and wallboards produced by factories located in coastal areas of southern China under natural curing conditions were 7.61 kg CO2/m3 and 5.84 kg CO2/m3 respectively.The carbon emissions conversion coefficients of concrete mixer,reinforcing bar production line and travelling crane between actual operation and with per the rated power were approximately 0.44,0.34 and 0.34 respectively.When the actual measurement cannot be performed,the conversion coefficient can be used to correct the data of the calculated at rated power to make it closer to the true value.The carbon emission factor of the laminated panels produced by the component factory in Beijing under steam curing concrete conditions was 132.15 kg CO2/m3,and the factory is used as a prototype,a complementary steam generation system model of solar energy and boiler was established,and it was calculated that the system can reduce CO2 emissions by about 300 tons throughout the year.
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.
文摘近年来,轻钢装配式建筑因施工便捷、环境效益高等优势,大量应用于工程实践,有很好的应用前景。而由于传统暖通空调设计方法导致的后续施工会二次破坏建筑构件,传统暖通空调设计方法已不适用于轻钢装配式建筑。目前,针对暖通空调与轻钢装配式建筑融合发展的研究与应用相对较少,为填补该领域的空白,提出了一种暖通空调系统(以多联机为例)与轻钢装配式建筑一体化设计新方法IB-VRV(variable refrigerant volume air conditioner integrating with buildings)。探究了适用于传统建筑的暖通空调设计方法与适用于轻钢装配式建筑的暖通空调设计方法的差异。并根据这两种暖通空调设计方法的差异,在现有传统暖通空调设计理念的基础上,凝练出暖通空调系统与轻钢装配式建筑融合发展三项原则。这三项融合原则分别为结构安全优先、非同寿命周期和功能区弹性化原则。基于上述三原则,进一步提出暖通空调系统与轻钢装配式建筑融合新方式,并以多联机系统为案例展开深入分析。研究结果表明,所提出的IB-VRV能够弥补传统暖通空调设计方法应用于轻钢装配式建筑的不足,并能充分发挥轻钢装配式建筑自重轻、结构简单、构件小可暗装等优势。该研究为暖通空调系统与其他类型装配式建筑一体化设计开拓了思路,奠定了理论基础。
