Method for extracting key information of power transmission line iron tower structure diagram

Abstract

The invention relates to a method for extracting key information of a power transmission line iron tower structure diagram, which comprises the following steps of: S1, obtaining a reading mode and a data processing method of graphic data according to a file format of the iron tower structure diagram; obtaining and filtering basic data of the iron tower structure diagram; s2, according to the representation mode of the iron tower component, constructing a power transmission iron tower component identification model; s3, constructing a transmission tower component connection structure model library; s4, completing conversion from primitive information to component information in the structure diagram through a component identification model and a component connection structure model library; s5, constructing a standard storage format of the key information of the iron tower structure, and storing the extracted key information of the iron tower structure; and S6, calling the stored iron tower structure key information as basic data of parametric modeling of the power transmission iron tower. Key information in an iron tower structure diagram can be rapidly, efficiently and accurately extracted and stored in a fixed format, and standardization and datamation of power transmission line iron tower information are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission line design, in particular to a method for extracting key information of a power transmission line iron tower structure diagram. Background Art

[0002] BIM (Building Information Modeling) technology is a digital tool used in engineering design, construction, and management. It integrates digital and information models of buildings and shares and transmits them throughout the entire life cycle of project planning, operation, and maintenance. The core of BIM is to establish a virtual three-dimensional model of the building project and use digital technology to provide this model with a complete and actual building project information database. With the development of information technology and smart grids, this technology is also gradually being applied in the field of power grid engineering design.

[0003] The tower structure diagram is used in the processing of tower components, on-site assembly and three-dimensional design of transmission lines. The key information in the tower structure diagram is digitized, so that the tower information can be quickly and efficiently transmitted among various construction units, which can greatly improve the efficiency of tower design and production and shorten the power grid construction cycle. However, at present, the key information of the tower structure diagram is in the manual extraction stage, which is inefficient and prone to errors. Different users have different focuses on tower information, and the information extracted by different users is not universal, resulting in a lot of duplication of work in the design and production process of the tower. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for extracting key information of a transmission line tower structure diagram, which can quickly, efficiently and accurately extract key information from the tower structure diagram and store it in a fixed format, thereby realizing standardization and digitization of transmission line tower information.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A method for extracting key information of a transmission line tower structure diagram comprises the following steps:

[0008] S1. According to the file format of the tower structure diagram, a reading method and a data processing method of the graphic data are obtained; basic data of the tower structure diagram is obtained and filtered out;

[0009] S2. Constructing a transmission tower component identification model based on the representation method of the tower components;

[0010] S3. Constructing a transmission tower component connection structure model library according to the structural regulations of the tower component connection and the connection method of the tower component;

[0011] S4, completing the transformation of the graphic element information in the structure diagram into the component information through the component identification model and the component connection structure model library;

[0012] S5. Construct a standard storage format for key information of the tower structure to store the extracted key information of the tower structure;

[0013] S6. Call the stored key information of the tower structure as the basic data for parametric modeling of the transmission tower.

[0014] In step S1, the file format of the tower structure drawing is DXF, and the DXF is a graphic data file of the AutoCAD system;

[0015] The reading method of the graphic data adopts a programming language to call an API library to read the DXF format of the drawing;

[0016] The data processing method is to take out an entity from the dxf group code file, and determine in turn whether the entity is a straight line, circle, arc, fill, polyline, text, or block; if it is a straight line, circle, text, or block, add the corresponding straight line graphic database record, circle graphic database record, and text graphic database record; if it is an arc, fill, or polyline, process and decompose it into basic graphic data.

[0017] In step S2, the representation of the tower components includes drawing content, tower segments, component numbers and tower structure regulations; the transmission tower component recognition model clusters the basic graphic elements in the structure diagram according to the basic graphic element types, basic attributes of the graphic elements and the relative position relationship between the graphic elements, so as to match the template of the tower components in the structure diagram.

[0018] In step S3, the connection method of the tower components includes the structural regulations for connecting the tower components and engineering cases for connecting the tower components;

[0019] In step S3, the tower component connection structure model library is to collect the connection modes of the components into a database, and continuously revise and update it, including the following steps:

[0020] S3.1. Use construction regulations as the basic criteria for identifying component connection methods;

[0021] S3.2, taking the common connection mode of the tower components as the standard sample and the remaining connection modes as the training samples;

[0022] S3.3, using the graphic attribute data and relative position relationship data in the standard sample as a feature template to form a database of graphic attributes and relative position relationships;

[0023] S3.4. Use data feature matching method to match the graphic attribute data and relative position relationship data in the training samples to determine whether the graphic attribute data and relative position relationship data in the training samples exist in the database; if they exist, they are discarded; if they do not exist, they are added to the original database until all training samples are judged.

[0024] In step S4, the conversion from the primitive information to the component information is to identify and match the components in the structure diagram through the component recognition model and the component connection structure model library, and convert the basic primitives (straight lines, circles, arcs, fills, polylines, text, blocks) in the structure diagram into component information.

[0025] In step S5, the standard storage format of the tower structure key information refers to storing the extracted tower structure drawing key information in a fixed format, and the stored information includes engineering information, tower use conditions, tower control dimensions, root opening table, pole tower segment information, component information and bolt information.

[0026] In step S6, the basic data for parametric modeling of the transmission tower refers to the storage format of key information of the tower structure diagram directly read by the three-dimensional parametric modeling program of the tower to complete the three-dimensional modeling of the tower.

[0027] The beneficial effects of the present invention are:

[0028] 1. By establishing a transmission tower component identification model and a transmission tower component connection structure model library, the geometric information of the basic graphics elements in the tower structure diagram can be converted into component attribute information and stored in a fixed format. The tower 3D parametric modeling program can directly read the data storage format to improve the efficiency and accuracy of tower 3D modeling. At the same time, tower information can also be transmitted in a fixed format to improve the efficiency and accuracy of data transmission; it can be widely used in the field of key information extraction of transmission line tower structure drawings, and also provides a reference for overhead transmission line 3D digitization technology and tower forward design. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the process of the present invention;

[0030] Figure 2 It is the basic structure diagram of the tower structure diagram file format DXF;

[0031] Figure 3 It is a flow chart of the basic processing method of the tower structure diagram graphic data;

[0032] Figure 4 is a schematic diagram of a component identification model;

[0033] Figure 5 is a schematic diagram of the bolt identification model;

[0034] Figure 6 It is a flow chart for constructing the tower component connection structure model library;

[0035] Figure 7 It is a schematic diagram of the contents of the tower structure diagram;

[0036] Figure 8 It is a flow chart of content recognition of tower structure diagram. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0038] Implementation 1

[0039] A method for extracting key information of a transmission line tower structure diagram comprises the following steps:

[0040] S1. According to the file format of the tower structure diagram, a reading method and a data processing method of the graphic data are obtained; basic data of the tower structure diagram is obtained and filtered out;

[0041] like Figure 1 As shown, firstly, according to the file format of the tower structure drawing, the basic data of the tower structure drawing is extracted, filtered and stored, and then according to the constructed tower component recognition model and component connection structure model library, the graphic element information in the structure drawing is converted into tower component information, and finally the extracted tower key information is stored in a fixed format as the basic data for parametric modeling of the tower.

[0042] like Figure 2 As shown in the figure, the file format of the tower structure drawing is DXF (Digital Exchange Format, DXF). A complete DXF consists of multiple segments and file endings, in the following order: 1) HEADER segment, containing basic information of the drawing, such as database version number, system variables, etc.; 2) CLASSES segment: contains graphic class information, including class definitions such as custom blocks and custom entities; 3) TABLES segment: contains symbol table descriptions, such as block reference tables, dimension style tables, text style tables, etc.; 4) BLOCKS segment: contains block reference definitions and segment for saving attributes of block references; 5) ENTITIES segment: contains graphic entities, such as polylines, text, circles, block entities, etc.; 6) File ending; DXF files are constructed from "data pairs" consisting of many "codes" and "values". The code here is called a "group code" to specify the type and purpose of the value that follows. Each group code and value must be in a separate line.

[0043] S2. Constructing a transmission tower component identification model based on the representation method of the tower components;

[0044] S3. Construct a transmission tower component connection structure model library according to the structural regulations of the tower component connection and the summary of the existing tower component connection methods;

[0045] S4, completing the transformation of the graphic element information in the structure diagram into the component information through the component identification model and the component connection structure model library;

[0046] S5. Construct a standard storage format for key information of the tower structure to store the extracted key information of the tower structure;

[0047] S6. Call the stored key information of the tower structure as the basic data for parametric modeling of the transmission tower.

[0048] In step S1, the file format of the tower structure drawing is DXF (Digital Exchange Format, DXF), and the DXF is a graphic data file of the AutoCAD system;

[0049] The reading method of the graphic data adopts a programming language to call an API library to read the DXF format of the drawing;

[0050] like Figure 3 As shown, the data processing method uses a programming language to call the API library to read the DXF format of the drawing. To take out an entity from the dxf group code file, it is determined in turn whether the entity is a straight line, circle, arc, fill, polyline, text, or block; if it is a straight line, circle, text, or block, the corresponding straight line graphic database record, circle graphic database record, and text graphic database record are added; if it is an arc, fill, or polyline, special processing is performed to decompose it into basic graphic data.

[0051] In step S2, the representation method of the tower components includes the provisions on the drawing content, tower segmentation, component numbering and tower structure in the tower structure drawing in the "Regulations on the Drawing and Construction of Transmission Line Towers" DL / T5442-2020; the transmission tower component recognition model clusters the basic graphic elements according to the basic graphic element types, basic attributes of the graphic elements and relative position relationships between the graphic elements in the structure drawing, so as to match the template of the tower components in the structure drawing.

[0052] like Figures 4 to 5As shown in the figure, it is a schematic diagram of the component identification model and the bolt identification model. The tower structure drawing is composed of basic graphics such as straight lines, polylines, circles, arcs and text according to certain rules to express structural information. The main information carrier is various graphic shapes composed of graphic contours and the spatial relationship between them; "Transmission Line Tower Drawing and Construction Regulations" DL / T5442-2020 has made clear provisions on the representation of tower components and bolts. According to the basic graphics type, basic attributes of graphics and relative position relationship between graphics in the structural drawing, the graphics are clustered for identifying and matching tower components in the structural drawing.

[0053] In step S3, the connection method of the tower components includes the construction regulations on the connection of tower components in the "Transmission Line Tower Drawing and Construction Regulations" DL / T5442-2020 and the engineering cases of existing tower component connections, and the main connection methods of the components are collected into a database, that is, a tower component connection structure model library;

[0054] The purpose of constructing the tower component connection structure model library is, on the one hand, to conduct detailed analysis on the sorted connection structure regulations and engineering cases, obtain the graphic attributes and relative position relationship characteristics of the connection structure, and form a feature template; on the other hand, to obtain the tower component connection structure big data by analyzing multiple engineering cases, and at the same time further process the graphic attributes and relative position relationship, and continuously update and improve the existing feature templates to form a typical transmission line tower component connection structure model library; the update and improvement of the feature template depends on the accuracy and typicality of the data in the graphic attribute and relative position relationship library. The graphic attribute and relative position data obtained by the component connection structure are judged by the data feature matching method whether they exist in the original database. If they exist, they will not be stored. If they do not exist, they will be stored in the database. For close and similar features, they can be judged manually; through the above two steps, the data feature template of the tower component connection structure model library is established to provide a basic database for the identification and matching of subsequent components.

[0055] like Figure 6 As shown, in step S3, the tower component connection structure model library is to collect the main connection modes of the components into a database, and continuously revise and update it, including the following steps:

[0056] S3.1. The structural provisions for tower component connections in the "Transmission Line Tower Drawing and Construction Regulations" DL / T 5442-2020 shall be used as the basic criteria for identifying component connection methods;

[0057] S3.2, taking the common connection mode of the tower components as the standard sample and the remaining connection modes as the training samples;

[0058] S3.3, using the graphic attribute data and relative position relationship data in the standard sample as a feature template to form a database of graphic attributes and relative position relationships;

[0059] S3.4. Use data feature matching method to match the graphic attribute data and relative position relationship data in the training samples to determine whether the graphic attribute data and relative position relationship data in the training samples exist in the database; if they exist, they are discarded; if they do not exist, they are added to the original database until all training samples are judged.

[0060] Among them, data feature matching includes two contents: graphic shape and geometric position relationship data. Graphic shape is the basis of data feature matching, and geometric position relationship is the key to data feature matching. Only when both are matched can the matching be successful.

[0061] like Figure 7 As shown in the figure, the tower structure drawing is composed of a segmented single-line diagram, a component assembly diagram, a component list and necessary text descriptions. The segmented single-line diagram shows the control dimensions of the segment, and the component assembly diagram shows all the information of the components of the segment, including geometric information, connection methods, processing technology, etc. The component list is a list of material information of the segment.

[0062] like Figure 8 As shown in the figure, the information in the tower structure diagram should be identified by specific content, and the key information should be extracted separately; the single-line diagram and the different views of the component assembly diagram are composed of many intersecting straight lines or polylines. The recursive algorithm is used to screen out the continuously intersecting straight lines and polylines to distinguish the different contents. For the segmented single-line diagram, the annotation information is identified and extracted to obtain the control size. For the component assembly diagram, the constructed component identification model and the tower component connection structure model library are used to identify and match the component information, and the conversion from the graphic element information to the component information is completed; for the component list, the "Regulations on the Drawing and Construction of Transmission Line Towers" DL / T 5442-2020 has clear provisions on the format and content of the component list. By identifying its text content and position, the information in the component list can be identified and extracted.

[0063] After extracting key information from the tower structure diagram, it is stored in a fixed format; the main information stored includes engineering information, tower usage conditions, tower control dimensions, root opening table, pole tower segment information, component information and bolt information, etc., and it is used as the basic data for the three-dimensional parametric modeling of the tower.

[0064] The project information includes tower name, project name and design unit.

[0065] The tower use conditions include tower type (straight Z / angle S / terminal DJ, etc.) and single- and double-return towers (single D / double S).

[0066] The root opening table includes the height (m), three-dimensional height (m), reduction (m), leg length (m), connection and retreat height (m), half-root opening of the tower (mm), anchor bolt specifications (grades) and anchor bolt spacing (mm), etc.

[0067] The tower segment information includes the segment number, the segment number connected to it and the weight of the segment.

[0068] The component information includes the component number, specification, length, geometric position relationship, connection method, weight, processing technology and remarks information.

[0069] The bolt information includes the bolt number, model, grade, geometric position relationship, weight and remarks information

[0070] In step S4, the conversion from the graphic element information to the component information is to identify and match the components in the structure diagram through the component recognition model and the component connection structure model library, and convert the basic graphic element (straight line, circle, arc, fill, polyline, text, block, etc.) information in the structure diagram into component information.

[0071] In step S5, the standard storage format of the tower structure key information refers to storing the extracted tower structure drawing key information in a fixed format. The main stored information includes engineering information, tower use conditions, tower control dimensions, root opening table, pole tower segment information, component information and bolt information.

[0072] In step S6, the basic data for parametric modeling of the transmission tower refers to a storage format in which the three-dimensional parametric modeling program of the tower can directly read key information of the tower structure diagram, thereby completing the three-dimensional modeling of the tower quickly and efficiently.

[0073] By establishing a transmission tower component recognition model and a transmission tower component connection structure model library, the geometric information of basic graphics elements in the tower structure diagram can be converted into component attribute information and stored in a fixed format. The tower 3D parametric modeling program can directly read the data storage format to improve the efficiency and accuracy of tower 3D modeling. At the same time, tower information can also be transmitted in a fixed format to improve the efficiency and accuracy of data transmission. It can be widely used in the field of key information extraction in transmission line tower structure drawings, and also provides a reference for overhead transmission line 3D digitization technology and tower forward design.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for extracting key information of a transmission line tower structure diagram, characterized in that: The following steps are involved: S1, according to the file format of the tower structure diagram, obtain the reading method and data processing method of the graphic data; Obtain and filter out the basic data of the tower structure diagram; S2. Constructing a transmission tower component identification model based on the representation method of the tower components; S3. Constructing a transmission tower component connection structure model library according to the structural regulations of the tower component connection and the connection method of the tower component; S4, completing the transformation of the graphic element information in the structure diagram into the component information through the component identification model and the component connection structure model library; S5. Construct a standard storage format for key information of the tower structure to store the extracted key information of the tower structure; S6. Call the stored key information of the tower structure as the basic data for parametric modeling of the transmission tower.

2. A method for extracting key information of a transmission line tower structure diagram as claimed in claim 1, characterized in that: In step S1, the file format of the tower structure drawing is DXF, and the DXF is a graphic data file of the AutoCAD system; The reading method of the graphic data adopts a programming language to call an API library to read the DXF format of the drawing; The data processing method is to take out an entity from the dxf group code file, and determine in turn whether the entity is a straight line, circle, arc, fill, polyline, text, or block; if it is a straight line, circle, text, or block, add the corresponding straight line graphic database record, circle graphic database record, and text graphic database record; if it is an arc, fill, or polyline, process and decompose it into basic graphic data.

3. A method for extracting key information of a transmission line tower structure diagram as claimed in claim 1, characterized in that: In step S2, the representation of the tower components includes drawing content, tower segments, component numbers and tower structure regulations; the transmission tower component recognition model clusters the basic graphic elements in the structure diagram according to the basic graphic element types, basic attributes of the graphic elements and the relative position relationship between the graphic elements, so as to match the template of the tower components in the structure diagram.

4. A method for extracting key information of a transmission line tower structure diagram as claimed in claim 1, characterized in that: In step S3, the connection method of the tower components includes structural regulations for connecting the tower components and engineering cases for connecting the tower components.

5. A method for extracting key information of a transmission line tower structure diagram as claimed in claim 1, characterized in that: In step S3, the tower component connection structure model library is to collect the connection modes of the components into a database, and continuously revise and update it, including the following steps: S3.

1. Use construction regulations as the basic criteria for identifying component connection methods; S3.2, taking the common connection mode of the tower components as the standard sample and the remaining connection modes as the training samples; S3.3, using the graphic attribute data and relative position relationship data in the standard sample as a feature template to form a database of graphic attributes and relative position relationships; S3.

4. Use data feature matching method to match the graphic attribute data and relative position relationship data in the training samples to determine whether the graphic attribute data and relative position relationship data in the training samples exist in the database; if they exist, they are discarded; if they do not exist, they are added to the original database until all training samples are judged.

6. A method for extracting key information of a transmission line tower structure diagram as claimed in claim 1, characterized in that: In step S4, the conversion from the primitive information to the component information is to identify and match the components in the structure diagram through the component recognition model and the component connection structure model library, and convert the basic primitives (straight lines, circles, arcs, fills, polylines, text, blocks) in the structure diagram into component information.

7. A method for extracting key information of a transmission line tower structure diagram as claimed in claim 1, characterized in that: In step S5, the standard storage format of the tower structure key information refers to storing the extracted tower structure drawing key information in a fixed format, and the stored information includes engineering information, tower use conditions, tower control dimensions, root opening table, pole tower segment information, component information and bolt information.

8. A method for extracting key information of a transmission line tower structure diagram as claimed in claim 1, characterized in that: In step S6, the basic data for parametric modeling of the transmission tower refers to the storage format of key information of the tower structure diagram directly read by the three-dimensional parametric modeling program of the tower to complete the three-dimensional modeling of the tower.

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