An efficient way to improve the efficiency of the applications based on formal concept analysis （FCA） is to construct the needed part of concept lattice used by applications. Inspired by this idea, an approach that ...An efficient way to improve the efficiency of the applications based on formal concept analysis （FCA） is to construct the needed part of concept lattice used by applications. Inspired by this idea, an approach that constructs lower concept semi-lattice called non-frequent concept semi-lattice in this paper is introduced, and the method is based on subposition assembly. Primarily, we illustrate the theoretical framework of subposition assembly for non-frequent concept semi-lattice. Second, an algorithm called Nocose based on this framework is proposed. Experiments show both theoretical correctness and practicability of the algorithm Nocose.展开更多
"Environmental protection concept" is the latest project construction concept put forward by Chinas construction industry in the market development. Reasonable, standardized and scientific use of green techn..."Environmental protection concept" is the latest project construction concept put forward by Chinas construction industry in the market development. Reasonable, standardized and scientific use of green technology in prefabricated building construction can not only bring into play the higher economic benefits of the building in the market, but also create a better social image for builders and construction units in the market. In order to implement this work, solve the extensive production problems existing in the early development of the construction industry in the market and reduce the problems of high energy consumption and heavy pollution caused by unreasonable construction technology.展开更多
China's continuous economic progress, the deepening process of urbanization, and the gradual improvement of people's living standards have brought more opportunities for the development of the construction ind...China's continuous economic progress, the deepening process of urbanization, and the gradual improvement of people's living standards have brought more opportunities for the development of the construction industry. The number of construction projects is increasing, and the scale of projects is expanding. In order to meet the increasing demand of people for the number of buildings, the construction industry is developing and innovating, and the application of prefabricated building mode comes into being. Building curtain wall is an important part of prefabricated building. Glass curtain wall is widely used in practice. In order to improve the overall quality of prefabricated building engineering and the overall beauty of the building, we should attach great importance to the construction of prefabricated building curtain wall and adopt scientific curtain wall construction technology. Combined with the concept of prefabricated building, this paper deeply analyzes the key points of curtain wall construction technology and the specific application of curtain wall construction method of prefabricated building, which provides valuable reference experience for building a scientific and complete curtain wall construction technology system of prefabricated building, providing technical support for prefabricated building, and promoting the healthy and sustainable development of prefabricated building in China.展开更多
A new method of virtual ship assembly modeling which integrates ship three-dimensional design and ship construction planning was described in this paper. A workflow model of simulation modeling based on the virtual sh...A new method of virtual ship assembly modeling which integrates ship three-dimensional design and ship construction planning was described in this paper. A workflow model of simulation modeling based on the virtual ship assembly process was also established; furthermore, a method of information transformation between the ship three-dimensional design and ship construction plan was formulated. To meet the requirements of information sharing between different systems in the ship virtual assembly, a simulation database was created by using the software engineering design method and the relational data model. With the application of this database, the information of ship three-dimensional design, construction planning, and virtual assembly can be integrated into one system. Subsequently, this new method was applied as a tool to simulate the virtual assembly of a ship, and the results guarantee its rationality and reliability.展开更多
In this paper,a synthesized technique is explored through design of a virtual experiment system for main aero-engine based on VR,which attempts to integrate some VR techniques,such as 3D stereo simulation and modeling...In this paper,a synthesized technique is explored through design of a virtual experiment system for main aero-engine based on VR,which attempts to integrate some VR techniques,such as 3D stereo simulation and modeling,3D scene management and human-computer virtual assembly based on data glove and collision detection.The geometry modeling and instantiation technique,virtual hand modeling and data glove interaction technique are discussed chiefly.Finally,taking aim at assembling and dismantling experiment system of a certain aero-engine,interface technology is expounded also.展开更多
Modularized construction is a new type of prefabricated building system with green environmental protection and excellent performance. There are few studies on the seismic performance of its key connection joint. This...Modularized construction is a new type of prefabricated building system with green environmental protection and excellent performance. There are few studies on the seismic performance of its key connection joint. This paper presents a new type of assembled connection joint for the high-rise modularized construction. Cyclic shear tests of full-scale joints were carried out, and the key indexes of their seismic performances including the hysteretic performance, ductility, and energy dissipation capacity were analyzed and obtained. The results show that the hysteresis loops of longitudinal and lateral cyclic shear tests were both plump in shapes. The ductility coefficients were 4.54 and 4.98, and the energy dissipation coefficients were 1.83 and 1.43, respectively. The test joint had good ductility and energy dissipation capacity. The positions of yield failure of specimens were mainly concentrated in the connection areas between the column and short beam or end-plate. The research can provide the technical reference for the seismic design and engineering application of related modularized constructions.展开更多
The Hong Kong-Zhuhai-Macao Bridge(HZMB)project,which has just been opened to traffic in 2018.The special location,construction conditions,quality requirements and multiple functions of HZMB brought many challenges,suc...The Hong Kong-Zhuhai-Macao Bridge(HZMB)project,which has just been opened to traffic in 2018.The special location,construction conditions,quality requirements and multiple functions of HZMB brought many challenges,such as management,technology,safety and environmental protection.To meet these challenges and ensure the achievement of high quality and 120 years design service life,the HZMB project first introduced the completely new concept of"Large size,Factory production,Standardization and Assembly",which was fundamental to the design and construction.This was developed in consideration of the difficulties of the offshore environment.The core idea was Prefabrication and Assembly,which was to change this HZMB project into onshore work as much as possible by cutting this mega sea-crossing into large sized components,which could be prefabricated on land and then transported to the offshore site for assembly.The success of the HZMB undoubtedly has led the technology of prefabrication and assembly to a new height and recognized scale.This paper describes the implementation process of the concept;"Large size,Factory production,Standardization and Assembly"(LFSA)to the HZMB.展开更多
Illegal construction has caused serious harm around the world. However, current methods are difficult to detect illegal construction activities in time, and the calculation complexity and the parameters of them are la...Illegal construction has caused serious harm around the world. However, current methods are difficult to detect illegal construction activities in time, and the calculation complexity and the parameters of them are large. To solve these challenges, a new and unique detection method is proposed, which detects objects related to illegal buildings in time to discover illegal construction activities. Meanwhile, a new dataset and a high-precision and lightweight detector are proposed. The proposed detector is based on the algorithm You Only Look Once (YOLOv4). The use of DenseNet as the backbone of YDHNet enables better feature transfer and reuse, improves detection accuracy, and reduces computational costs. Meanwhile, depthwise separable convolution is employed to lightweight the neck and head to further reduce computational costs. Furthermore, H-swish is utilized to enhance non-linear feature extraction and improve detection accuracy. Experimental results illustrate that YDHNet realizes a mean average precision of 89.60% on the proposed dataset, which is 3.78% higher than YOLOv4. The computational cost and parameter count of YDHNet are 26.22 GFLOPs and 16.18 MB, respectively. Compared to YOLOv4 and other detectors, YDHNet not only has lower computational costs and higher detection accuracy, but also timely identifies illegal construction objects and automatically detects illegal construction activities.展开更多
With the acceleration of urbanization, the scale of urban buildings is expanding day by day, and the requirements for construction efficiency, building function and quality are higher and higher. The development of co...With the acceleration of urbanization, the scale of urban buildings is expanding day by day, and the requirements for construction efficiency, building function and quality are higher and higher. The development of construction technology has played a positive role in improving the efficiency and quality of construction projects. This paper analyzes the construction technology of concrete prefabricated residential buildings, further studies the advantages of the construction technology of prefabricated residential buildings, and analyzes the deficiencies in the current construction engineering, hoping to provide some help and reference value to relevant people and enterprises.展开更多
Prefabricated building is a new trend in the development of the construction industry at present. Through the modularization, prefabrication, standardization and industrialization of building components, the rapid and...Prefabricated building is a new trend in the development of the construction industry at present. Through the modularization, prefabrication, standardization and industrialization of building components, the rapid and modern construction can be realized. As a new prefabricated technology, laminated plates are also gradually applied in today's construction. Starting from the analysis of the advantages and disadvantages of the present laminated plate technology, this paper expounds the difficulties and key points of the laminated plate technology in the construction process, and makes some prospects for the development of the laminated plate technology in the future, hoping to help promote the faster development of the assembled building.展开更多
In this paper, the structural form of the project is frame structure, and the prefabrication rate is 80%. The main structures such as column, beam, laminated plate, balcony plate, toilet plate, exterior wall plate, gu...In this paper, the structural form of the project is frame structure, and the prefabrication rate is 80%. The main structures such as column, beam, laminated plate, balcony plate, toilet plate, exterior wall plate, gutter and parapet and so on are prefabricated components. According to the construction organization process of the project, the construction process of the assembled integral concrete frame structure is discussed. Firstly, the key preparation work in the early stage of prefabricated construction site is analyzed from three aspects: construction flow section division, component yard layout and component delivery plan. Secondly, the paper analyzes the construction organization process of the project, focusing on the interpenetration of construction processes. Finally, considering the key construction procedures and main influencing factors, the construction methods and solutions are put forward and applied to improve the adjustment of column reserved reinforcement, vertical grouting connection of precast column, supporting mode of external retaining wall of frame structure, hoisting mode of high prefabricated component and special planning of prefabricated construction with BIM Technology. For the next step in-depth study of the prefabricated construction technology and provide the basis for guiding the prefabricated construction of frame structure.展开更多
In view of the problems such as backward production mode,poor quality stability,high safety risk and incomplete control system during erection of the reinforcement framework of simply-supported box girders for high-sp...In view of the problems such as backward production mode,poor quality stability,high safety risk and incomplete control system during erection of the reinforcement framework of simply-supported box girders for high-speed railway(HSR),and in combination with the key points and main challenges in the reinforcement framework construction of Guangzhou-Zhanjiang HSR,the overall technical route for the intelligent manufacturing of reinforcement framework of simply-supported box girders is put forward.The component design of reinforcement framework of simply supported box girder is carried out based on BIM,and the feasibility of the scheme is verified through segment assembly test.The assembly techniques are studied in combination with the mesh design scheme to achieve rapid forming of the reinforcement framework.R&D of automatic processing equipment for components,material transshipment equipment,automatic hoisting equipment and technological equipment for assembly clamping fixture are carried out to realize the overall design of equipment production line.An intelligent control system is developed for the whole-process intelligent construction of reinforcement framework to realize the full life-cycle applications for the workshop production and visual management including intelligent layout and quality traceability.The research results systematically optimize and innovate the assembly and forming technologies of reinforcement framework in the prefabrication beam yard of high-speed railway,realize the component processing,automatic assembly and information technology management,improve the construction quality,efficiency and information technology level of intelligent manufacturing of reinforcement framework of railway prefabricated beam as a whole,and reduce the construction cost of the project.The research has realized a major breakthrough in the construction technology of railway prefabricated box girders,which has the extensive technical and market promotion values.展开更多
基金Supported by the National Natural Science Foundation of China (60970018)the Fundamental Research Funds for the Central Universities
文摘An efficient way to improve the efficiency of the applications based on formal concept analysis （FCA） is to construct the needed part of concept lattice used by applications. Inspired by this idea, an approach that constructs lower concept semi-lattice called non-frequent concept semi-lattice in this paper is introduced, and the method is based on subposition assembly. Primarily, we illustrate the theoretical framework of subposition assembly for non-frequent concept semi-lattice. Second, an algorithm called Nocose based on this framework is proposed. Experiments show both theoretical correctness and practicability of the algorithm Nocose.
文摘"Environmental protection concept" is the latest project construction concept put forward by Chinas construction industry in the market development. Reasonable, standardized and scientific use of green technology in prefabricated building construction can not only bring into play the higher economic benefits of the building in the market, but also create a better social image for builders and construction units in the market. In order to implement this work, solve the extensive production problems existing in the early development of the construction industry in the market and reduce the problems of high energy consumption and heavy pollution caused by unreasonable construction technology.
文摘China's continuous economic progress, the deepening process of urbanization, and the gradual improvement of people's living standards have brought more opportunities for the development of the construction industry. The number of construction projects is increasing, and the scale of projects is expanding. In order to meet the increasing demand of people for the number of buildings, the construction industry is developing and innovating, and the application of prefabricated building mode comes into being. Building curtain wall is an important part of prefabricated building. Glass curtain wall is widely used in practice. In order to improve the overall quality of prefabricated building engineering and the overall beauty of the building, we should attach great importance to the construction of prefabricated building curtain wall and adopt scientific curtain wall construction technology. Combined with the concept of prefabricated building, this paper deeply analyzes the key points of curtain wall construction technology and the specific application of curtain wall construction method of prefabricated building, which provides valuable reference experience for building a scientific and complete curtain wall construction technology system of prefabricated building, providing technical support for prefabricated building, and promoting the healthy and sustainable development of prefabricated building in China.
基金Supported by Key National Science & Technology Specific Projects under Grant No. 2008ZX05027-005-002
文摘A new method of virtual ship assembly modeling which integrates ship three-dimensional design and ship construction planning was described in this paper. A workflow model of simulation modeling based on the virtual ship assembly process was also established; furthermore, a method of information transformation between the ship three-dimensional design and ship construction plan was formulated. To meet the requirements of information sharing between different systems in the ship virtual assembly, a simulation database was created by using the software engineering design method and the relational data model. With the application of this database, the information of ship three-dimensional design, construction planning, and virtual assembly can be integrated into one system. Subsequently, this new method was applied as a tool to simulate the virtual assembly of a ship, and the results guarantee its rationality and reliability.
文摘In this paper,a synthesized technique is explored through design of a virtual experiment system for main aero-engine based on VR,which attempts to integrate some VR techniques,such as 3D stereo simulation and modeling,3D scene management and human-computer virtual assembly based on data glove and collision detection.The geometry modeling and instantiation technique,virtual hand modeling and data glove interaction technique are discussed chiefly.Finally,taking aim at assembling and dismantling experiment system of a certain aero-engine,interface technology is expounded also.
基金Sponsored by the Natural Science Foundation of Shandong Province of China (Grant No. ZR2019MEE047)the National Key Research and Development Project of China (Grant No. 2020YFB1901403)CSCEC Technical and Development Plan (Grant No. CSCEC-2020-Z-35)。
文摘Modularized construction is a new type of prefabricated building system with green environmental protection and excellent performance. There are few studies on the seismic performance of its key connection joint. This paper presents a new type of assembled connection joint for the high-rise modularized construction. Cyclic shear tests of full-scale joints were carried out, and the key indexes of their seismic performances including the hysteretic performance, ductility, and energy dissipation capacity were analyzed and obtained. The results show that the hysteresis loops of longitudinal and lateral cyclic shear tests were both plump in shapes. The ductility coefficients were 4.54 and 4.98, and the energy dissipation coefficients were 1.83 and 1.43, respectively. The test joint had good ductility and energy dissipation capacity. The positions of yield failure of specimens were mainly concentrated in the connection areas between the column and short beam or end-plate. The research can provide the technical reference for the seismic design and engineering application of related modularized constructions.
文摘The Hong Kong-Zhuhai-Macao Bridge(HZMB)project,which has just been opened to traffic in 2018.The special location,construction conditions,quality requirements and multiple functions of HZMB brought many challenges,such as management,technology,safety and environmental protection.To meet these challenges and ensure the achievement of high quality and 120 years design service life,the HZMB project first introduced the completely new concept of"Large size,Factory production,Standardization and Assembly",which was fundamental to the design and construction.This was developed in consideration of the difficulties of the offshore environment.The core idea was Prefabrication and Assembly,which was to change this HZMB project into onshore work as much as possible by cutting this mega sea-crossing into large sized components,which could be prefabricated on land and then transported to the offshore site for assembly.The success of the HZMB undoubtedly has led the technology of prefabrication and assembly to a new height and recognized scale.This paper describes the implementation process of the concept;"Large size,Factory production,Standardization and Assembly"(LFSA)to the HZMB.
基金supported in part by the National Natural Science Foundation of China(Nos.62177034 and 61972046).
文摘Illegal construction has caused serious harm around the world. However, current methods are difficult to detect illegal construction activities in time, and the calculation complexity and the parameters of them are large. To solve these challenges, a new and unique detection method is proposed, which detects objects related to illegal buildings in time to discover illegal construction activities. Meanwhile, a new dataset and a high-precision and lightweight detector are proposed. The proposed detector is based on the algorithm You Only Look Once (YOLOv4). The use of DenseNet as the backbone of YDHNet enables better feature transfer and reuse, improves detection accuracy, and reduces computational costs. Meanwhile, depthwise separable convolution is employed to lightweight the neck and head to further reduce computational costs. Furthermore, H-swish is utilized to enhance non-linear feature extraction and improve detection accuracy. Experimental results illustrate that YDHNet realizes a mean average precision of 89.60% on the proposed dataset, which is 3.78% higher than YOLOv4. The computational cost and parameter count of YDHNet are 26.22 GFLOPs and 16.18 MB, respectively. Compared to YOLOv4 and other detectors, YDHNet not only has lower computational costs and higher detection accuracy, but also timely identifies illegal construction objects and automatically detects illegal construction activities.
文摘With the acceleration of urbanization, the scale of urban buildings is expanding day by day, and the requirements for construction efficiency, building function and quality are higher and higher. The development of construction technology has played a positive role in improving the efficiency and quality of construction projects. This paper analyzes the construction technology of concrete prefabricated residential buildings, further studies the advantages of the construction technology of prefabricated residential buildings, and analyzes the deficiencies in the current construction engineering, hoping to provide some help and reference value to relevant people and enterprises.
文摘Prefabricated building is a new trend in the development of the construction industry at present. Through the modularization, prefabrication, standardization and industrialization of building components, the rapid and modern construction can be realized. As a new prefabricated technology, laminated plates are also gradually applied in today's construction. Starting from the analysis of the advantages and disadvantages of the present laminated plate technology, this paper expounds the difficulties and key points of the laminated plate technology in the construction process, and makes some prospects for the development of the laminated plate technology in the future, hoping to help promote the faster development of the assembled building.
文摘In this paper, the structural form of the project is frame structure, and the prefabrication rate is 80%. The main structures such as column, beam, laminated plate, balcony plate, toilet plate, exterior wall plate, gutter and parapet and so on are prefabricated components. According to the construction organization process of the project, the construction process of the assembled integral concrete frame structure is discussed. Firstly, the key preparation work in the early stage of prefabricated construction site is analyzed from three aspects: construction flow section division, component yard layout and component delivery plan. Secondly, the paper analyzes the construction organization process of the project, focusing on the interpenetration of construction processes. Finally, considering the key construction procedures and main influencing factors, the construction methods and solutions are put forward and applied to improve the adjustment of column reserved reinforcement, vertical grouting connection of precast column, supporting mode of external retaining wall of frame structure, hoisting mode of high prefabricated component and special planning of prefabricated construction with BIM Technology. For the next step in-depth study of the prefabricated construction technology and provide the basis for guiding the prefabricated construction of frame structure.
文摘In view of the problems such as backward production mode,poor quality stability,high safety risk and incomplete control system during erection of the reinforcement framework of simply-supported box girders for high-speed railway(HSR),and in combination with the key points and main challenges in the reinforcement framework construction of Guangzhou-Zhanjiang HSR,the overall technical route for the intelligent manufacturing of reinforcement framework of simply-supported box girders is put forward.The component design of reinforcement framework of simply supported box girder is carried out based on BIM,and the feasibility of the scheme is verified through segment assembly test.The assembly techniques are studied in combination with the mesh design scheme to achieve rapid forming of the reinforcement framework.R&D of automatic processing equipment for components,material transshipment equipment,automatic hoisting equipment and technological equipment for assembly clamping fixture are carried out to realize the overall design of equipment production line.An intelligent control system is developed for the whole-process intelligent construction of reinforcement framework to realize the full life-cycle applications for the workshop production and visual management including intelligent layout and quality traceability.The research results systematically optimize and innovate the assembly and forming technologies of reinforcement framework in the prefabrication beam yard of high-speed railway,realize the component processing,automatic assembly and information technology management,improve the construction quality,efficiency and information technology level of intelligent manufacturing of reinforcement framework of railway prefabricated beam as a whole,and reduce the construction cost of the project.The research has realized a major breakthrough in the construction technology of railway prefabricated box girders,which has the extensive technical and market promotion values.
