At present, the progress of the assembly construction is mainly restricted by the speed of the manufacturer's component production, transportation methods and other factors. Design changes are unfavorable for the production of components, and it is prone to "mistakes, leaks, bumps, and shortages" during the installation process. Therefore, the integration of BIM and RFID, and its application, from component fabrication to installation, will greatly improve production efficiency. The following is a brief analysis of the application of BIM and RFID technology in the construction management of prefabricated buildings. 1. Application of BIM technology in prefabricated building construction management The application of BIM technology in prefabricated building construction management mainly includes three parts: construction site management, 5D dynamic cost control and visualization. (1) Construction site management. The construction site management based on BIM is arranged through the virtual construction site of the computer before construction, simulating the construction process of the main construction machinery, and minimizing the crossover of the boom while satisfying the lifting range of the tower crane covering the entire construction surface; simulating the layout of the main material site , reduce or even avoid secondary handling. (2) BIM-based 5D dynamic cost control. BIM-based 5D dynamic construction cost control is based on the 3D model, adding time and cost to form a 5D building information model. Through virtual construction, the material stacking, project progress, and capital input are reasonable, and the actual construction process is discovered in time. The existing problems, optimize the construction period, resource allocation, adjust resources and capital investment in real time, optimize the construction period and cost targets, and form an optimal building model to guide the next construction (see Figure 1). In this system, first, the BIM model needs to be established, and all information related to the project is input in the BIM model, including basic information of the components (such as name, specification and model, supplier); secondly, in the 3D model. Add time parameters and cost plans to each component to form a 5D BIM model; again, use the computer to perform BIM 5D virtual construction display based on additional time and cost parameters. Through virtual construction, you can check whether the schedule or cost plan is reasonable. Whether the logical relationship is accurate, timely discover various problems and risks that may occur during the construction process, and modify and adjust the model and plan according to the existing problems, optimize the BIM model, adjust the schedule and cost plan, and optimize the completed model. Virtual construction, if no problems are found after the virtual construction, you can guide the implementation. In addition, BIM technology can be used to handle various changes during construction. When design changes occur during the construction process, BIM is used to link the changes to the model. At the same time, the changes in the quantity of the project and the cost are reflected, so that the decision makers can better understand the impact of the design changes on the cost, and timely adjust the fund raising and investment plans. (3) Visualization technology. Visualization of the bottom is to use the BIM technology to virtually display the various construction processes before the construction of each process, especially the full-scale three-dimensional display of new technologies, new processes and complex nodes, effectively reducing the misunderstanding caused by human subjective factors, making the interpretation more intuitive It is easier to understand and make communication between departments more efficient. 2. Application of RFID technology in prefabricated building construction management Different from the traditional construction engineering management, the construction management process of the assembly building can be divided into five parts: production, transportation, admission, storage and lifting. Can timely and accurately grasp the information on the manufacturing, transportation, and presence of various components during the construction process, which greatly affects the progress management and construction process of the entire project, and the effective component information on the construction site, which is beneficial to the various components of the site. And the stacking of the parts system to reduce secondary handling. However, the traditional material management method is not only easy to make mistakes, but also has a certain lag. To solve the problem of disjointed assembly and construction process, the author discusses the application of RFID technology in the whole process of assembly building construction. And the method is shown in Figure 2. (1) Component production stage. In the prefabrication stage of the component, first, the prefabricated personnel of the prefabricated field use the reading and writing device to write all the information of the component or part (such as the size of the prefabricated column, maintenance information, etc.) into the RFID chip, according to the user's needs and the current coding method. At the same time, the coding rules of the engineering contract list are used to encode the components (see Figure 3). The RFID chip, which writes all the information of the component, is then implanted into the component or part system by the producer for reading and reviewing relevant information by the staff at various stages in the future. K1-3: The name of the project, expressed in English letters, less than three letters, used in front of 0, such as: Olympic items are represented as 0AY; K4-5: Unit engineering code, using 1-99 digital code, such as: Building No. 9 of Olympic Village, indicated as 09; K6: above ground/underground works, the underground is 0, and the ground is 1; K7-8: floor number, such as: 9 floors above ground is indicated as 09; K9: Component type, such as: Column-C, Beam-B, Floor-F,...; K10-12: quantity code; K13-14: Job status, this column belongs to the status bar and is updated with the status of RFID collection information, such as warehousing Phase-CC, installation phase-AZ,...; K15-17: Expansion zone. (2) Component transportation stage. In the component transportation stage, the RFID chip is mainly implanted on the transportation vehicle, and the transportation condition of the vehicle is collected at any time, and the shortest route and the shortest time route are sought, thereby effectively reducing transportation costs and speeding up the progress of the project. (3) Admission and storage management stages. The card reader in the access control system immediately informs the relevant personnel to carry out the entrance inspection and on-site acceptance after receiving the information on the entry of the transportation vehicle. After the acceptance is passed, it is transported to the designated location for storage according to the regulations, and the presence information of the component is recorded into the RFID chip. In order to check the information and usage of the accessories in the future. (4) Component lifting stage. The ground staff and the construction machinery operators each hold the reader and the display, and the ground personnel read the relevant information of the components, and the results are displayed on the display, and the mechanical operators hoist according to the information on the display in order, one step in place, saving time and effort . In addition, the use of RFID technology can achieve precise positioning characteristics in a small range, can quickly locate and arrange transportation vehicles, and improve work efficiency. 3. Integrated application of BIM and RFID in construction process management of construction projects In modern information management systems, BIM and RFID belong to two systems—construction control and material supervision. Combine BIM and RFID technology to establish a modern information technology platform (BIM and RFID-based construction project construction process management system architecture is shown in Figure (4). That is to add two attributes in the BIM model database - location attributes and The progress attribute allows us to get the location information and progress information of the component in the model in the software application. The specific application is as follows: (1) Component production and transportation stages. The database established by the BIM model is used as the data foundation, and the information collected by the RFID is timely transmitted to the basic database, and matches the model through the defined location attribute and the progress attribute. In addition, through the information fed back by RFID, it is possible to accurately predict whether the component can enter the site as planned, and make a comparison between the actual progress and the planned progress. If there is a deviation, adjust the schedule or construction process in time to avoid the accumulation of the construction or assembly. As well as venue and capital occupancy. (2) Component entry and site management. When the component enters the site, the component information read by the RFID Reader is transferred to the database and matched with the position attribute and the progress attribute in the BIM model to ensure the accuracy of the information; and at the same time, through the position attribute of the component defined in the BIM model, The position of each component can be clearly displayed. When the component or material is stored, the components are stacked point-to-point to avoid secondary transportation. (3) Component hoisting stage. If only the BIM model is used, simply hoisting information by manual input is not only error-prone but also conducive to the timely delivery of information; if only RFID is used, only the component information can be viewed in the database, and the abstract imagination can be imagined through the two-dimensional drawing through the personal supervisor. Judging, the results may vary. BIM-RFID facilitates the timely delivery of information, presenting timely progress comparisons and comparisons from specific 3D views. Temporary Swimming Pool Fence,Welded Wire Mesh Temporary Fence,Construction Site Temporary Fence,Removable Temporary Fence Panel Haotian Hardware Wire Mesh Products Co.,Ltd , https://www.hshtwiremesh.com