CN109885939B - Photovoltaic power station construction method and system based on building information model - Google Patents
Photovoltaic power station construction method and system based on building information model Download PDFInfo
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Abstract
The invention provides a building information model-based photovoltaic power station construction method, which comprises the steps of establishing a building information model by utilizing a Building Information Model (BIM) technology on a photovoltaic power station construction platform; converting the acquired position parameters of the photovoltaic power generation equipment in the BIM into space geographic parameters in a Geographic Information System (GIS); storing the parameters into a database, and synchronizing the parameters into a cloud server; sending the data to each mobile terminal of a construction site for building a photovoltaic power station; and sending the installation state information and the equipment running state information of the installed photovoltaic power generation equipment to the cloud server through the mobile terminal, synchronizing the installation state information and the equipment running state information to a photovoltaic power station construction platform, and updating the state of the photovoltaic power generation equipment in a building information model. The construction progress and the installation and running states of the photovoltaic power generation equipment of the photovoltaic power station can be monitored visually in real time, so that designers can test and adjust the construction progress and the installation and running states of the photovoltaic power generation equipment, and the construction precision of the photovoltaic power station is improved.
Description
Technical Field
The invention relates to the field of photovoltaic power station construction, in particular to a photovoltaic power station construction method and system based on a building information model.
Background
Building Information Modeling (BIM) is a technology for creating and applying a digital model to all stages of the whole life cycle of a Building project, Building Information models are built by taking all relevant Information data of the Building project as the basis of the model, and real Information of a Building is simulated through digital Information. The model established by the BIM is used as a shared building information resource, is a core and data basis for specific application and various performance analysis of all stages of the whole life cycle of a building project, and the BIM technology becomes a standard of the building industry.
The BIM technology is applied to the building design of the photovoltaic power station, so that the solar photovoltaic building can be subjected to collaborative design. However, in the prior art, due to the complex ground environment in construction and construction, the placement position of the photovoltaic facilities in different ground environments is related to the surface environment characteristics, so that the precision of the building and construction of the photovoltaic power station by adopting the BIM technology cannot be guaranteed, and the construction progress, equipment installation and operation state of the photovoltaic power station cannot be monitored in real time.
Disclosure of Invention
In order to solve the problems, the invention provides a building information model-based photovoltaic power station construction method, which adopts a building information model BIM technology to convert design parameters under the BIM into space Geographic parameters based on a GIS (Geographic information system), thereby improving the construction precision of a photovoltaic power station and simultaneously monitoring the construction progress of the photovoltaic power station and the installation and operation states of photovoltaic power generation equipment in real time.
The technical scheme of the invention is as follows:
a photovoltaic power station construction method based on a building information model is characterized by comprising the following steps:
s1, building information models of the photovoltaic power stations are built on the photovoltaic power station building platform by utilizing a building information model BIM technology;
s2, acquiring equipment parameters of each photovoltaic power generation equipment, position parameters of the power generation equipment in the BIM and spatial incidence relations among the power generation equipment according to the building information model of the photovoltaic power station;
s3, converting the position parameters of the photovoltaic power generation equipment in the BIM into space geographic parameters in a Geographic Information System (GIS);
s4, storing the equipment parameters of the photovoltaic power generation equipment, the position parameters of the power generation equipment in the BIM and the spatial incidence relation among the power generation equipment into a database;
s5, synchronizing the data in the database to a cloud server;
s6, sending the data in the cloud server to each mobile terminal of a construction site for building a photovoltaic power station, and installing the photovoltaic power generation equipment according to the data when the photovoltaic power station is built;
s7, sending the installation state information and the equipment running state information of the installed photovoltaic power generation equipment to the cloud server through the mobile terminal;
and S8, the cloud server synchronizes the installation state information and the equipment running state information to a photovoltaic power station construction platform, and updates the installation state and the running state of the photovoltaic power generation equipment in the construction information model.
The equipment parameters of the photovoltaic power generation equipment comprise: device ID and electrical properties.
The position parameters of the photovoltaic power generation equipment in the BIM comprise: and the three-dimensional position coordinate parameter of the photovoltaic power generation equipment in the BIM model.
The database stores the data based on the SQLsever, and the cloud server stores, processes and calculates the data.
The step of converting the position parameters of the photovoltaic power generation equipment in the BIM into the space geographic parameters in the geographic information system GIS comprises the following steps: and converting the attribute data of the BIM of the photovoltaic power station into the space geographic data of the photovoltaic power station through program coding, wherein the geometrical primitive features in the BIM are subjected to space analysis by adopting a method of mapping an IFC component in the BIM and a CityGML component in a GIS system, and then are converted into space geographic parameters in the GIS.
The mapping between the IFC component in the BIM model and the CityGML component in the GIS system comprises the step of mapping the IFC component and the CityGML component by adopting a multi-level semantic mapping model.
The mobile terminal comprises a browser used for a user to browse the BIM model of the photovoltaic power station so as to determine the installation position of the photovoltaic power generation equipment.
A system for building photovoltaic power plants based on building information models, the system comprising: the system comprises a photovoltaic power station construction platform, a cloud server and a mobile terminal; wherein the content of the first and second substances,
the photovoltaic power station building platform is used for building a building information model of the photovoltaic power station by utilizing a Building Information Model (BIM) technology; acquiring equipment parameters of each photovoltaic power generation equipment, position parameters of the power generation equipment in the BIM and a spatial incidence relation between the power generation equipment according to the building information model of the photovoltaic power station; converting the position parameters of the photovoltaic power generation equipment in the BIM into space geographic parameters in a Geographic Information System (GIS); the photovoltaic power station construction platform comprises a database, a storage module and a display module, wherein the database is used for storing equipment parameters of the photovoltaic power generation equipment, position parameters of the power generation equipment in the BIM and spatial incidence relations among the power generation equipment; synchronizing data in the database to a cloud server; receiving installation state information and equipment running state information sent by the cloud server, and updating the installation state and the running state of the photovoltaic power generation equipment in the building information model;
the cloud server is used for receiving data sent by the photovoltaic power station construction platform; receiving installation state information and equipment running state information sent by a mobile terminal, and synchronizing the installation state information and the equipment running state information to the photovoltaic power station construction platform;
the mobile terminal is used for receiving the data in the cloud server, displaying the data on the mobile terminal and installing the photovoltaic power generation equipment according to the data when a photovoltaic power generation station is built; the installation state information and the equipment running state information of the installed photovoltaic power generation equipment are sent to the cloud server; the mobile terminals comprise a plurality of construction sites for building photovoltaic power stations;
the equipment parameters of the photovoltaic power generation equipment comprise: device ID and electrical properties.
The position parameters of the photovoltaic power generation equipment in the BIM comprise: and the three-dimensional position coordinate parameter of the photovoltaic power generation equipment in the BIM model.
The database stores the data based on the SQLsever, and the cloud server stores, processes and calculates the data.
The step of converting the position parameters of the photovoltaic power generation equipment in the BIM into the space geographic parameters in the geographic information system GIS comprises the following steps: and converting the attribute data of the BIM of the photovoltaic power station into the space geographic data of the photovoltaic power station through program coding, wherein the geometrical primitive features in the BIM are subjected to space analysis by adopting a method of mapping an IFC component in the BIM and a CityGML component in a GIS system, and then are converted into space geographic parameters in the GIS.
The mapping between the IFC component in the BIM model and the CityGML component in the GIS system comprises the step of mapping the IFC component and the CityGML component by adopting a multi-level semantic mapping model.
The mobile terminal comprises a browser used for a user to browse the BIM model of the photovoltaic power station so as to determine the installation position of the photovoltaic power generation equipment.
Compared with the prior art, the invention has the beneficial effects that:
the building information model BIM technology is adopted, design parameters under the BIM are converted into space geographic parameters based on the GIS, a mobile terminal is adopted to return the equipment installation state and the running state of a construction site, the space geographic parameters are displayed in the BIM, the construction progress of a photovoltaic power station and the installation and running states of photovoltaic power generation equipment can be monitored visually in real time, designers can carry out testing and adjustment, real-time construction progress monitoring is provided for a construction building unit and a supervision unit, and therefore the construction precision of the photovoltaic power station is improved.
Drawings
Fig. 1 is a schematic diagram of a photovoltaic power plant construction method based on a building information model in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a system for building a photovoltaic power plant based on a building information model according to an embodiment of the present invention.
In the figure, 201 represents a photovoltaic power station construction platform, 202 represents a cloud server, and 203 represents a mobile terminal.
Detailed Description
In order to make the objects, technical solutions and advantageous technical effects of the present invention clearer, the present invention is further described in detail with reference to the following embodiments. It should be understood that the embodiments described in this specification are only for the purpose of explaining the present invention and can be implemented, but the embodiments are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1, the method for building a photovoltaic power plant based on a building information model according to the present invention includes the following steps:
and S1, building information models of the photovoltaic power stations are built on the photovoltaic power station building platform by utilizing the BIM technology.
In the process of establishing the building information model of the photovoltaic power station by using the building information model BIM technology, the IFC data model is used as the data model for building the BIM, the IFC data model can present geometric information and semantic information of building construction, and construction process information can be described through spatial association of IFC components.
And S2, acquiring the equipment parameters of each photovoltaic power generation equipment, the position parameters of the power generation equipment in the BIM and the spatial incidence relation among the power generation equipment according to the building information model of the photovoltaic power station.
Wherein the equipment parameters of the photovoltaic power generation equipment comprise: the device ID and the electrical attribute, the position parameter of the photovoltaic power generation device in the BIM comprises: and the three-dimensional position coordinate parameter of the photovoltaic power generation equipment in the BIM model.
And S3, converting the position parameters of the photovoltaic power generation equipment in the BIM into space geographic parameters in a Geographic Information System (GIS).
The step of converting the position parameters of the photovoltaic power generation equipment in the BIM into the space geographic parameters in the geographic information system GIS comprises the following steps: and converting the attribute data of the BIM of the photovoltaic power station into the space geographic data of the photovoltaic power station through program coding, wherein the geometrical primitive features in the BIM are subjected to space analysis by adopting a method of mapping an IFC component in the BIM and a CityGML component in a GIS system, and then are converted into space geographic parameters in the GIS.
The mapping between the IFC component in the BIM model and the CityGML component in the GIS system comprises the step of mapping the IFC component and the CityGML component by adopting a multi-level semantic mapping model.
As the IFC has 900 different types, the information stored by the types is different and has various types such as association relation, attributes, geometric expression and the like. Therefore, when the IFC component in the BIM model is mapped with the CityGML component in the GIS, the IFC component and the CityGML component can be mapped by adopting a multi-level semantic mapping model. This may improve the efficiency of mapping the IFC component with the CityGML component. Moreover, in the above 900 types, not all types need to be converted into parameters in the GIS system, for example, some types do not include space geometry information, so that in the process of conversion, the types of the IFC components can be classified and screened first, and then semantic mapping is performed, thereby improving the efficiency and accuracy of mapping the IFC components with the CityGML components.
And S4, storing the equipment parameters of the photovoltaic power generation equipment, the position parameters of the power generation equipment in the BIM and the spatial incidence relation among the power generation equipment in a database.
And the database stores the data based on the SQLsever.
And S5, synchronizing the data in the database to the cloud server.
And the cloud server stores, processes and calculates the data.
And S6, sending the data in the cloud server to each mobile terminal of a construction site for building the photovoltaic power station, and installing the photovoltaic power generation equipment according to the data when the photovoltaic power station is built.
The mobile terminal comprises a browser used for a user to browse the BIM model of the photovoltaic power station so as to determine the installation position of the photovoltaic power generation equipment.
The mobile terminal includes but is not limited to: notebook, IPAD, cell phone, etc.
And S7, sending the installation state information and the equipment running state information of the installed photovoltaic power generation equipment to the cloud server through the mobile terminal.
And sending the installation state information and the equipment running state information of the installed photovoltaic power generation equipment to the cloud server through the mobile terminal for storage and processing so as to update the installation state and the running state of the photovoltaic power generation equipment in a BIM (building information modeling) model in a photovoltaic power station construction platform.
And S8, the cloud server updates the installation state and the operation state of the photovoltaic power generation equipment in the building information model by using the installation state information and the equipment operation state information.
And the photovoltaic power station construction platform receives the processed installation state information and equipment running state information sent by the cloud server, updates the installation state and running state of the photovoltaic power generation equipment in the construction information model, and stores the installation state and running state in the database.
The cloud server is used as intermediate equipment for data interaction and updating between the photovoltaic power station construction platform and the mobile terminal, so that data safety of the photovoltaic power station construction platform is guaranteed, installation state information and equipment running state information uploaded by the mobile terminal can be processed, installation states and running states of the photovoltaic power generation equipment in the building information model can be updated, and data processing pressure of the photovoltaic power station construction platform is reduced.
Example 2
As shown in fig. 2, the system for building a photovoltaic power plant based on a building information model is characterized in that the system comprises: the system comprises a photovoltaic power station construction platform 201, a cloud server 202 and a mobile terminal 203; wherein the content of the first and second substances,
the photovoltaic power station building platform 201 is used for building a building information model of the photovoltaic power station by utilizing a Building Information Model (BIM) technology; acquiring equipment parameters of each photovoltaic power generation equipment, position parameters of the power generation equipment in the BIM and a spatial incidence relation between the power generation equipment according to the building information model of the photovoltaic power station; converting the position parameters of the photovoltaic power generation equipment in the BIM into space geographic parameters in a Geographic Information System (GIS); the photovoltaic power station construction platform comprises a database, a storage module and a display module, wherein the database is used for storing equipment parameters of the photovoltaic power generation equipment, position parameters of the power generation equipment in the BIM and spatial incidence relations among the power generation equipment; synchronizing data in the database to a cloud server; receiving installation state information and equipment running state information sent by the cloud server, and updating the installation state and the running state of the photovoltaic power generation equipment in the building information model;
the equipment parameters of the photovoltaic power generation equipment comprise: device ID and electrical properties.
The position parameters of the photovoltaic power generation equipment in the BIM comprise: and the three-dimensional position coordinate parameter of the photovoltaic power generation equipment in the BIM model.
And the database stores the data based on the SQLsever.
In the process of establishing the building information model of the photovoltaic power station by using the building information model BIM technology, the IFC data model is used as the data model for building the BIM, the IFC data model can present geometric information and semantic information of building construction, and construction process information can be described through spatial association of IFC components.
The step of converting the position parameters of the photovoltaic power generation equipment in the BIM into the space geographic parameters in the geographic information system GIS comprises the following steps: and converting the attribute data of the BIM of the photovoltaic power station into the space geographic data of the photovoltaic power station through program coding, wherein the geometrical primitive features in the BIM are subjected to space analysis by adopting a method of mapping an IFC component in the BIM and a CityGML component in a GIS system, and then are converted into space geographic parameters in the GIS.
The mapping between the IFC component in the BIM model and the CityGML component in the GIS system comprises the step of mapping the IFC component and the CityGML component by adopting a multi-level semantic mapping model.
As the IFC has 900 different types, the information stored by the types is different and has various types such as association relation, attributes, geometric expression and the like. Therefore, when the IFC component in the BIM model is mapped with the CityGML component in the GIS, the IFC component and the CityGML component can be mapped by adopting a multi-level semantic mapping model. This may improve the efficiency of mapping the IFC component with the CityGML component. Moreover, in the above 900 types, not all types need to be converted into parameters in the GIS system, for example, some types do not include space geometry information, so that in the process of conversion, the types of the IFC components can be classified and screened first, and then semantic mapping is performed, thereby improving the efficiency and accuracy of mapping the IFC components with the CityGML components.
And the photovoltaic power station construction platform receives the processed installation state information and equipment running state information sent by the cloud server, updates the installation state and running state of the photovoltaic power generation equipment in the construction information model, and stores the installation state and running state in the database.
The cloud server 202 is used for receiving data sent by the photovoltaic power station construction platform; receiving installation state information and equipment running state information sent by a mobile terminal, and synchronizing the installation state information and the equipment running state information to the photovoltaic power station construction platform;
and the cloud server stores, processes and calculates the data.
The mobile terminal 203 is used for receiving the data in the cloud server, displaying the data on the mobile terminal, and installing the photovoltaic power generation equipment according to the data when a photovoltaic power generation station is built; the installation state information and the equipment running state information of the installed photovoltaic power generation equipment are sent to the cloud server; the mobile terminals comprise a plurality of mobile terminals and are used for construction sites for building photovoltaic power stations.
And sending the installation state information and the equipment running state information of the installed photovoltaic power generation equipment to the cloud server through the mobile terminal for storage and processing so as to update the installation state and the running state of the photovoltaic power generation equipment in a BIM (building information modeling) model in a photovoltaic power station construction platform.
The mobile terminal comprises a browser used for a user to browse the BIM model of the photovoltaic power station so as to determine the installation position of the photovoltaic power generation equipment.
The mobile terminal includes but is not limited to: notebook, IPAD, cell phone, etc.
In addition, a plurality of mobile terminals (204) can be arranged in the design unit, the construction unit and the supervision unit, and are used for downloading the latest whole construction information from the photovoltaic power station construction platform, and opening the design unit, the construction unit and the supervision unit so that the design unit, the construction unit and the supervision unit can check the design state and the construction progress. For a design unit, more accurate updating and site construction conditions can be checked, and unreasonable design or construction parts can be adjusted in time; for a construction building unit, the project progress, the working condition and the matching condition of each unit can be mastered more accurately; for the supervision unit, supervision work can be arranged according to the viewed real-time construction progress. In addition, the construction building unit can realize the transverse comparison of the construction quality of the sub-packaging units engaged in the same work by monitoring the project progress, the working condition of each unit and the matching condition.
The cloud server is used as intermediate equipment for data interaction and updating between the photovoltaic power station construction platform and the mobile terminal, so that data safety of the photovoltaic power station construction platform is guaranteed, installation state information and equipment running state information uploaded by the mobile terminal can be processed, installation states and running states of the photovoltaic power generation equipment in the building information model can be updated, and data processing pressure of the photovoltaic power station construction platform is reduced.
The invention adopts the BIM technology of the building information model to convert the design parameters under the BIM into the space geographic parameters based on the GIS, and adopts the mobile terminal to return the equipment installation state and the operation state of the construction site, and the equipment installation state and the operation state are displayed in the BIM, so that the construction progress of the photovoltaic power station and the installation and operation states of the photovoltaic power generation equipment can be visually monitored in real time, the construction progress can be tested and adjusted by designers, and the real-time construction progress monitoring can be provided for a construction building unit and a supervision unit, thereby improving the construction precision of the photovoltaic power station.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (6)
1. A photovoltaic power station construction method based on a building information model is characterized by comprising the following steps:
s1, building information models of the photovoltaic power stations are built on the photovoltaic power station building platform by utilizing a building information model BIM technology;
s2, acquiring equipment parameters of each photovoltaic power generation equipment, position parameters of the power generation equipment in the BIM and spatial incidence relations among the power generation equipment according to the building information model of the photovoltaic power station;
s3, converting the position parameters of the photovoltaic power generation equipment in the BIM into space geographic parameters in a Geographic Information System (GIS), comprising the following steps: converting attribute data of a BIM (building information modeling) of the photovoltaic power station into space geographic data of the photovoltaic power station through program coding, wherein a method for mapping an IFC (information frequency control) component in the BIM and a CityGML (geographic information system) component in a GIS (geographic information system) system is adopted, the geometric primitive features in the BIM are subjected to space analysis and further converted into space geographic parameters in the GIS, a multi-level semantic mapping model is adopted for mapping, and in the conversion process, the types of the IFC components are firstly classified and screened, and then semantic mapping is carried out;
s4, storing the equipment parameters of the photovoltaic power generation equipment, the position parameters of the power generation equipment in the BIM and the spatial incidence relation among the power generation equipment into a database;
s5, synchronizing the data in the database to a cloud server;
s6, sending the data in the cloud server to each mobile terminal of a construction site for building a photovoltaic power station, and installing the photovoltaic power generation equipment according to the data when the photovoltaic power station is built;
s7, sending the installation state information and the equipment running state information of the installed photovoltaic power generation equipment to the cloud server through the mobile terminal;
and S8, the cloud server synchronizes the installation state information and the equipment running state information to a photovoltaic power station construction platform, and updates the installation state and the running state of the photovoltaic power generation equipment in the construction information model.
2. The building information model-based photovoltaic power plant construction method of claim 1, wherein the equipment parameters of the photovoltaic power generation equipment comprise: device ID and electrical properties; the position parameters of the photovoltaic power generation equipment in the BIM comprise: three-dimensional position coordinate parameters of the photovoltaic power generation equipment in the BIM model; the database stores the data based on the SQLsever, and the cloud server stores, processes and calculates the data.
3. The building information model-based photovoltaic power plant construction method according to claim 1, wherein the mobile terminal comprises a browser for a user to browse the BIM model of the photovoltaic power plant in order to determine the installation location of the photovoltaic power generation equipment.
4. A system for building photovoltaic power plants based on building information models, the system comprising: the system comprises a photovoltaic power station construction platform, a cloud server and a mobile terminal; wherein the content of the first and second substances,
the photovoltaic power station building platform is used for building a building information model of the photovoltaic power station by utilizing a Building Information Model (BIM) technology; acquiring equipment parameters of each photovoltaic power generation equipment, position parameters of the power generation equipment in the BIM and a spatial incidence relation between the power generation equipment according to the building information model of the photovoltaic power station; converting the position parameters of the photovoltaic power generation equipment in the BIM into space geographic parameters in a Geographic Information System (GIS), comprising the following steps: converting attribute data of a BIM (building information modeling) of the photovoltaic power station into space geographic data of the photovoltaic power station through program coding, wherein a method for mapping an IFC (information frequency control) component in the BIM and a CityGML (geographic information system) component in a GIS (geographic information system) system is adopted, the geometric primitive features in the BIM are subjected to space analysis and further converted into space geographic parameters in the GIS, a multi-level semantic mapping model is adopted for mapping, and in the conversion process, the types of the IFC components are firstly classified and screened, and then semantic mapping is carried out; the photovoltaic power station construction platform comprises a database, a storage module and a display module, wherein the database is used for storing equipment parameters of the photovoltaic power generation equipment, position parameters of the power generation equipment in the BIM and spatial incidence relations among the power generation equipment; synchronizing data in the database to a cloud server; receiving installation state information and equipment running state information sent by the cloud server, and updating the installation state and the running state of the photovoltaic power generation equipment in the building information model;
the cloud server is used for receiving data sent by the photovoltaic power station construction platform; receiving installation state information and equipment running state information sent by a mobile terminal, and synchronizing the installation state information and the equipment running state information to the photovoltaic power station construction platform;
the mobile terminal is used for receiving the data in the cloud server, displaying the data on the mobile terminal and installing the photovoltaic power generation equipment according to the data when a photovoltaic power generation station is built; the installation state information and the equipment running state information of the installed photovoltaic power generation equipment are sent to the cloud server; the mobile terminals comprise a plurality of mobile terminals and are used for construction sites for building photovoltaic power stations.
5. The building information model-based system for photovoltaic power plant construction according to claim 4, wherein the equipment parameters of the photovoltaic power generation equipment include: device ID and electrical properties; the position parameters of the photovoltaic power generation equipment in the BIM model comprise: three-dimensional position coordinate parameters of the photovoltaic power generation equipment in the BIM model; the database stores the data based on the SQLsever, and the cloud server stores, processes and calculates the data.
6. The building information model-based photovoltaic power plant construction system of claim 4, wherein the mobile terminal comprises a browser for a user to browse the BIM model of the photovoltaic power plant in order to determine the installation location of the photovoltaic power generation equipment.
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| CN114399406B (en) * | 2022-01-20 | 2023-11-21 | 黄河勘测规划设计研究院有限公司 | Hydraulic engineering multi-user collaborative management system and method based on GIS and BIM |
| CN114580062B (en) * | 2022-03-08 | 2022-12-13 | 中国华电科工集团有限公司 | Large-scale photovoltaic power plant engineering construction quality analysis cloud system based on big data |
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| CN105931294B (en) * | 2016-04-19 | 2019-02-12 | 西南交通大学 | A method of BIM physical model is converted into detail GIS standardized model |
| CN206292792U (en) * | 2016-12-30 | 2017-06-30 | 济宁职业技术学院 | A kind of device that green construction simulation is carried out by BIM |
| CN106855704A (en) * | 2017-03-21 | 2017-06-16 | 广东技术师范学院 | A kind of data acquisition unit in Architectural Equipment information access high in the clouds |
| CN108875273B (en) * | 2018-07-12 | 2022-12-27 | 河北工业大学 | BIM-based foundation pit engineering forward design and operation and maintenance management system |
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2019
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