CN112182728B - BIM coordinate and engineering coordinate conversion method based on spatial analysis - Google Patents
BIM coordinate and engineering coordinate conversion method based on spatial analysis Download PDFInfo
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Abstract
The invention discloses a conversion method of BIM coordinates and engineering coordinates based on spatial analysis, which comprises the following steps of S1, establishing a BIM design model and a system database, and importing three-dimensional entity model data of the BIM design model into the system database; and determining the topological relation between the BIM design model entities according to the mileage direction. S2, extracting three-dimensional entity model data, and simultaneously carrying out coordinate transformation by using a space analysis method; simultaneously acquiring at least more than 3 known control point coordinate calculation conversion by using a space analysis method, and registering with a solid model in two-dimensional solid graphic data; registering entity model coordinates except the control point coordinates according to the topological relation; and S3, acquiring BIM coordinates of the three-dimensional entity model data for result checking. The method effectively solves the problems of information loss, low precision and the like between the BIM model and the site construction data, has high calculation speed and high precision, and finally realizes the mutual conversion of the design coordinates and the construction coordinates.
Description
Technical Field
The invention relates to the technical field of coordinate conversion, in particular to a conversion method of BIM coordinates and engineering coordinates based on spatial analysis.
Background
In the indoor design and field construction processes of modern railway engineering, different coordinate systems are often adopted for design coordinates and construction coordinates, and particularly, the BIM technology commonly used at present by railway design departments adopts a custom coordinate system, and in actual construction, the coordinates of the custom coordinate system in a BIM model are strictly converted into the coordinates in the construction coordinate system, so that the structural feature points grabbed in the BIM model can be lofted on a construction site.
The current common method in industry is to use the exchange format DXF file of CAD to change the BIM model into a plan view, calculate the rotation angle and translation distance, and then convert with the construction coordinate system.
The prior art has the defects that the BIM model is subjected to multiple data format conversion and transformation, so that the attribute information of the BIM building model is easy to lose, the model information is distorted, and the site construction is not facilitated. Meanwhile, in the conversion process, multiple conversion angles and translation distances are calculated, so that calculation errors are easily caused. And the angle and the distance are calculated for each conversion, so that the conversion efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and solve the problems of data loss, information distortion, various data calculation errors and the like caused by the conversion and the conversion of the data format of the BIM for multiple times.
In order to achieve the above objective, a method for converting BIM coordinates and engineering coordinates based on spatial analysis is adopted to solve the problems set forth in the above background art.
A conversion method of BIM coordinates and engineering coordinates based on spatial analysis comprises the following steps:
s1, building a BIM design model and a system database, and importing three-dimensional entity model data of the BIM design model;
s2, extracting three-dimensional entity model data, and simultaneously carrying out coordinate transformation by using a space analysis method;
and S3, acquiring BIM coordinates of the three-dimensional entity model data for result checking.
As a further aspect of the invention: the three-dimensional solid model data comprise coordinate data of pile foundations, bearing platforms, pier columns and beam bodies.
As a further aspect of the invention: the step S1 is a specific step of establishing a BIM design model and a system database and importing three-dimensional entity model data of the BIM design model, and comprises the following steps:
s11, building a BIM design model and a system database;
s12, importing three-dimensional entity model data of the BIM design model into a system database;
s13, determining the topological relation between BIM design model entities according to the mileage direction.
As a further aspect of the invention: the step S2 extracts the three-dimensional solid model data, and the specific method for transforming coordinates by using the method of spatial analysis includes:
s21, extracting two-dimensional entity graphic data from the three-dimensional entity model data;
s22, acquiring at least more than 3 known control point coordinate calculation conversion by using a space analysis method, and registering with a solid model in the two-dimensional solid graphic data;
s23, registering entity model coordinates except for the completed control point coordinates according to the topological relation among the entity models;
and S24, giving coordinates of all control points to pile foundations, bearing platforms, pier columns and beam bodies in the two-dimensional entity graphic data.
As a further aspect of the invention: the specific method for calculating and converting the known control point coordinates comprises the following steps:
calculating and converting the coordinates of the known control points by utilizing a four-parameter principle;
the four parameter principle formula is:
wherein x1 and y1 are plane rectangular coordinates of an original coordinate system, x2 and y2 are plane rectangular coordinates of a geodetic coordinate system, alpha is a rotation parameter, deltax and Deltay are translation parameters, and m is a scale parameter.
As a further aspect of the invention: the specific step of obtaining BIM coordinates of the three-dimensional entity model data for result checking in the step S3 comprises the following steps:
s31, acquiring BIM coordinates of three-dimensional entity model data and calculating coordinates calculated by known control point coordinates;
s32, performing error checking and judging on the BIM coordinates and the calculated coordinates;
s33, if the error meets the requirement, the coordinate conversion result is obtained, and if the error does not meet the requirement, the conversion is recalculated.
As a further aspect of the invention: the BIM coordinates and the calculated coordinates comprise pile foundation coordinates, bearing platform coordinates, pier column coordinates and beam body coordinates.
By adopting the technical scheme, the method for solving other entity coordinates in the BIM model is deduced based on a space analysis principle by utilizing known control points in a construction coordinate system on the basis of a four-parameter algorithm by following the principle of unchanged entity topology in the BIM model, and finally, the mutual conversion between the design coordinates and the construction coordinates is realized.
Compared with the prior art, the invention has the following technical effects: through the introduction of the BIM design model, the topological relation of the entity model is established, the known control points in the construction coordinate system are utilized for calculating conversion based on the four-parameter principle, meanwhile, the coordinate data conversion and conversion of all the control points are further selected, the matching registration is carried out on the control points and the BIM design model, and meanwhile, the error analysis is carried out on the design coordinates of the BIM design model and the calculation coordinates in the actual construction coordinate system, so that the correct conversion between the control points and the calculation coordinates is obtained. The problem that the attribute information of the BIM building model is easy to lose, and the model information distortion caused by the attribute information is unfavorable for site construction is solved. And the calculation of the conversion angle and the translation distance of the traditional calculation method, which leads to calculation errors. The conversion efficiency of the coordinate conversion is increased. A more accurate coordinate conversion method is provided.
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The following detailed description of specific embodiments of the invention refers to the accompanying drawings, in which:
FIG. 1 is a block flow diagram of a method for converting BIM coordinates and engineering coordinates disclosed by the invention;
FIG. 2 is a schematic diagram of a control point to be calculated according to the present disclosure;
FIG. 3 is a table showing pile center coordinate data of pile foundations according to the present disclosure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, in an embodiment of the present invention, a method for converting BIM coordinates and engineering coordinates based on spatial analysis includes:
s1, building a BIM design model and a system database, and importing three-dimensional entity model data of the BIM design model;
building a BIM design model and a system database for various data storage, and importing three-dimensional entity model data of the BIM design model into the system database; and determining the topological relation between the BIM design model entities according to the mileage direction. The three-dimensional solid model data comprise coordinate data of pile foundations, bearing platforms, pier columns and beam bodies.
Wherein, pile foundation, cushion cap, pier stud, each component in bridge engineering such as roof beam body. The highway bridge further comprises members such as tie beams and lower tie beams, and coordinates of the members such as tie beams and lower tie beams can be further extracted.
S2, extracting three-dimensional entity model data, and simultaneously carrying out coordinate transformation by using a space analysis method;
extracting and converting the three-dimensional entity model data into two-dimensional entity graphic data; further, a space analysis method is utilized to obtain at least more than 3 known control point coordinates corresponding to the two-dimensional entity graph data, calculation conversion is carried out by utilizing an algorithm, and registration is further carried out with the entity model in the two-dimensional entity graph; registering coordinates of the entity models except the coordinates of the completed control points according to the confirmed topological relation between the entity models; and giving all the control point coordinates to pile foundations, bearing platforms, pier columns and beam bodies in the two-dimensional entity graphic data.
S3, acquiring BIM coordinates of the three-dimensional entity model data for result checking;
acquiring BIM coordinates of three-dimensional entity model data and calculated coordinates; performing error checking judgment on the BIM coordinates and the calculated coordinates; if the error meets the requirement, the coordinate conversion result is obtained, and if the error does not meet the requirement, the conversion is recalculated.
The BIM coordinates and the calculated coordinates comprise pile foundation coordinates, bearing platform coordinates, pier column coordinates and beam body coordinates.
In some disclosed embodiments, the specific steps include:
firstly, building a BIM design model and a system database, importing BIM coordinate data of a DAE format pile foundation, a bearing platform, pier columns, a beam body and the like into a computing platform, and confirming and setting a topological relation of the BIM design model, for example, determining according to a mileage direction; the logical pile foundation number is carried out according to the topological relation, for example, from a large mileage to a small mileage or from the small mileage to the large mileage, and the rule is named along the increasing direction of the pier column number.
The method comprises the steps of importing acquired coordinate data of known control points into a construction coordinate system, setting the coordinate data as reference data, and simultaneously converting the coordinate data of a BIM design model into pile foundations, bearing platforms, pier columns and beam bodies of two-dimensional entity graphic data for registration;
based on the four-parameter principle, the coordinate data of known control points are utilized to calculate the corresponding control point coordinates in the BIM design model, wherein at least 3 control point coordinates are acquired to convert, and when the known control points are more, the obtained precision is higher. The principle is as follows:
calculating and converting the coordinates of the known control points by utilizing a four-parameter principle;
the four parameter principle formula is:
wherein x1 and y1 are plane rectangular coordinates of an original coordinate system, x2 and y2 are plane rectangular coordinates of a geodetic coordinate system, alpha is a rotation parameter, deltax and Deltay are translation parameters, and m is a scale parameter.
As shown in fig. 2, the design coordinates of the two points in the BIM design model are shown as follows:
1-1(-341.6934,2183.6313)；2-4(-22229.8158，-25882.9044)
the measured construction coordinates of the two points are:
1-1(3508206.4763,511312.9794)、2-4(3508183.2365，511286.0215)；
four parameters calculated from these two points:
α＝0.035012、m＝0.999633、△x＝3508201.477247、△y＝511315.665058；
and selecting and calculating entity model coordinates except the registered key points according to the principle of unchanged entity topology by following the topological relation determined in the BIM model. Meanwhile, error analysis and judgment are carried out on calculated coordinates of calculation of the design coordinates and the actually measured construction coordinates in the BIM design model, and if the calculated coordinates do not accord with the calculated coordinates, the calculated coordinates are recalculated. If so, the conversion is correct. And further, the whole conversion between BIM coordinates and actual engineering coordinates is realized.
The technical effect of the invention is that, as shown in fig. 3, the pile center coordinate data of pile foundation is shown as a comparison table. The pile center coordinates of any pile foundation can be obtained within a reasonable range.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (3)
1. The conversion method of BIM coordinates and engineering coordinates based on spatial analysis is characterized by comprising the following steps:
s1, building a BIM design model and a system database, and importing three-dimensional entity model data of the BIM design model in a DAE format;
the method comprises the following specific steps:
s11, building a BIM design model and a system database;
s12, importing three-dimensional entity model data of the BIM design model into a system database;
s13, determining the topological relation between BIM design model entities according to the mileage direction;
s2, extracting three-dimensional entity model data, and simultaneously carrying out coordinate transformation by using a space analysis method, wherein the specific method comprises the following steps of:
s21, extracting two-dimensional entity graphic data from the three-dimensional entity model data;
s22, acquiring at least more than 3 known control point coordinate calculation conversion by using a space analysis method, and registering with a solid model in the two-dimensional solid graphic data;
s23, registering entity model coordinates except for the completed control point coordinates according to the topological relation among the entity models;
s24, giving coordinates of all control points to pile foundations, bearing platforms, pier columns and beam bodies in the two-dimensional entity graphic data;
the specific method for calculating and converting the known control point coordinates comprises the following steps:
calculating and converting the coordinates of the known control points by utilizing a four-parameter principle;
the four parameter principle formula is:
wherein x1 and y1 are plane rectangular coordinates of an original coordinate system, x2 and y2 are plane rectangular coordinates of a geodetic coordinate system, alpha is a rotation parameter, deltax and Deltay are translation parameters, and m is a scale parameter;
s3, acquiring BIM coordinates of three-dimensional entity model data for result checking, wherein the method specifically comprises the following steps:
s31, acquiring BIM coordinates of three-dimensional entity model data and calculating coordinates calculated by known control point coordinates;
s32, performing error checking and judging on the BIM coordinates and the calculated coordinates;
s33, if the error meets the requirement, the coordinate conversion result is obtained, and if the error does not meet the requirement, the conversion is recalculated.
2. The method for converting BIM coordinates and engineering coordinates based on spatial analysis according to claim 1, wherein the three-dimensional solid model data includes coordinate data of pile foundation, bearing platform, pier stud and beam body.
3. The method for converting BIM coordinates and engineering coordinates based on spatial analysis according to claim 1, wherein the BIM coordinates and calculated coordinates comprise pile foundation coordinates, bearing platform coordinates, pier stud coordinates and beam body coordinates.
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Inventor after: Shen Zhijun Inventor after: Yu Song Inventor after: Xia Song Inventor after: Hou Yongle Inventor after: Song Shenglin Inventor after: Zhou Qingyong Inventor after: Li Qiuyi Inventor after: Zhu Shanmei Inventor after: Yang Zhou Inventor after: Hao Guoyu Inventor after: Zhang Xinyi Inventor after: Huang Jingxin Inventor after: Li Shuai Inventor before: Zhu Shanmei Inventor before: Hao Guoyu Inventor before: Zhou Qingyong Inventor before: Zhang Xinyi Inventor before: Huang Jingxin Inventor before: Yu Song Inventor before: Xia Song Inventor before: Hou Yongle Inventor before: Song Shenglin |