A sub-model generation method based on ifc entity data extraction

Abstract

The invention belongs to the field of building information technologies and discloses a sub-model generation method based on IFC (Industry Foundation Classes) model entity data extraction. The method comprises the following steps of reading a data source based on an IFC standard and obtaining a candidate set of target entities therefrom; inputting model requirements and translating the requirements into constraints for sub-model extraction through an IFD standard or an IFC entity data dictionary based on nature language description; extracting attribute values of the target entities from the candidate set based on the constraints; and recombining extraction results to data structures, namely BIM (Building Information Modelling) sub-models, which are needed by a user, based on user requirements. The method can effectively support extraction of the sub-models of the IFC model and generation of the BIM sub-models which are independent of the IFC standard and has various manifestations and provides the technical support and the model foundation for high-density data interaction, data transmission and cooperative work in the whole building lifecycle.

Description

technical field [0001] The invention relates to the technical field of construction industry information, in particular to a sub-model generating method based on IFC entity data extraction. Background technique [0002] Building Information Modeling (Building Information Modeling, BIM) is a digital model that uses the relevant information data of construction projects as the basis of the model and simulates the real information of buildings through digital information simulation technology. BIM can correlate resources and data at different stages of the building life cycle, and be used by different participants in the construction process. BIM technology can realize information delivery and sharing, and effectively improve the implementation of construction, design, operation and maintenance in various stages of the construction industry. efficiency. [0003] Industry Foundation Classes (IFC) is an open and structured BIM information exchange format published by the Interna...

AI Technical Summary

Problems solved by technology

[0009] 1. The sub-model is highly specialized, complex in analysis, high in calculation and space complexity;

[0010] 2. Professional BIM database design is required to realize sub-model extraction according to the sub-model view and multi-participant collaborative work, which is costly and difficult to implement;

[0011] 3. Low transmission and application efficiency;

[0012] 4. Data collaboration first requires all participants to support the IFC standard, which is costly and poor in usability;

[0013] 5. Does not support BIM sub-model version control, and the availability of sub-models is poor;

[0014] 6. When the sub-model is used multiple times, it is necessary to repeatedly extract the global model, and it is difficult to realize the reuse of sub-models;

[0015] 7. A large amount of data query is required;

[0016] 8. The relative value density of data is low;

[0017] 9. With the refinement of the design and the increase of the project scale, the BIM model will face massive data, and IFC's own exchange rate and exchange method will face huge challenges

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