CN108595883B - Two-dimensional railway bridge three-dimensional BIM rapid modeling method - Google Patents
Two-dimensional railway bridge three-dimensional BIM rapid modeling method Download PDFInfo
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Abstract
The invention relates to a three-dimensional BIM rapid modeling method for a two-dimensional railway bridge, which comprises the following steps: establishing a railway bridge line information model; building a pier foundation template, a pier body template and a top cap template; building a bridge girder template; establishing a railway bridge vertical face and plane arrangement information model; when the three-dimensional geometric construction information of corresponding parts of the pier foundation template, the pier body template and the top cap template or the girder template cannot be completely expressed, establishing a three-dimensional model of the foundation template, the pier body template, the top cap template or the girder template and other detailed structures under a local coordinate system; the line information model, the pier foundation template, the pier body template, the top cap template, the girder template, the railway bridge facade and the plane layout information model are expressed by a two-dimensional functional graphic object to jointly describe the railway bridge three-dimensional BIM information model; and comprehensively analyzing the model information of the bridge three-dimensional BIM information model, and realizing the construction of the three-dimensional BIM model of the railway bridge by using interactive drawing software or third-party BIM modeling software.
Description
Technical Field
The invention relates to an engineering design method of a railway bridge, in particular to a three-dimensional BIM rapid modeling method of a two-dimensional railway bridge.
Background
BIM (building Information modeling) is a construction and application technology which takes a three-dimensional graph as a carrier and can load Information models of a plurality of related projects, time, cost and the like, and can be realized by a computer modeling method, thereby providing an efficient, cooperative, visual and even intelligent engineering application support for the whole process from design, construction to operation and maintenance of the construction project. At present, the BIM technology has become a hot information technology in the engineering construction fields of buildings, water conservancy, highways, railway traffic infrastructures and the like, and has become a development strategy for potential mining and efficiency enhancement and enterprise competitiveness improvement of enterprises in the engineering construction field.
In the field of railway engineering construction, bridge three-dimensional BIM model construction which can meet the railway bridge arrangement specification of China is a basic key technology of railway engineering construction BIM application, and although railway bridge BIM modeling can be realized by adopting international mainstream brand three-dimensional BIM software, the problems of more complex modeling method and low modeling efficiency exist.
Disclosure of Invention
The invention aims to provide a two-dimensional railway bridge three-dimensional BIM rapid modeling method so as to realize simple, convenient, rapid and efficient modeling of a railway bridge three-dimensional space outline.
The invention is realized by the following steps: a two-dimensional railway bridge three-dimensional BIM rapid modeling method comprises the following steps:
a. establishing a line information model of a line section where the railway bridge is located according to line information including planar central line information, vertical curve information and line broken link information of the line;
b. decomposing all piers in the railroad bridge into three components of a top cap, a pier body and a foundation, classifying the top cap, the pier body and the foundation respectively according to the difference of structures, shapes and/or sizes, drawing two-dimensional geometric figures of each type of top cap, each type of pier body and each type of foundation respectively by utilizing interactive drawing software, combining the figures, and correspondingly forming a two-dimensional geometric figure object of each type of top cap, a two-dimensional geometric figure object of each type of pier body and a two-dimensional geometric figure object of each type of foundation;
c. converting the two-dimensional geometric figure object of each type of top cap into a two-dimensional functional figure object through interactive drawing software to form a top cap template object, and inputting engineering information including top cap parameters, the name of the top cap template, the grade of concrete, the type and the number of reinforcing steel bars to form a top cap information model called a top cap template; when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the top cap, an interactive drawing software or other third-party BIM software is needed to establish a top cap three-dimensional model under a local coordinate system, and a connection relation is established between the top cap three-dimensional model and a top cap template;
d. converting the two-dimensional geometric figure object of each pier body into a two-dimensional functional figure object through interactive drawing software to form a pier body template object, inputting engineering information including the longitudinal gradient rate of the pier body, the transverse gradient rate of the pier body, the name of the pier body template, the grade of concrete, the model number and the quantity of reinforcing steel bars, and determining or modifying the position of a datum point of the pier body according to the specific position of the pier body on a line, thereby forming a pier body information model called as a pier body template; when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the pier body, an interactive drawing software or other third-party BIM software is needed to establish a three-dimensional model of the pier body under a local coordinate system, and a connection relation is established between the three-dimensional model and a pier body template;
e. converting the two-dimensional geometric figure object of each type of foundation into a two-dimensional functional figure object through interactive drawing software to form a pier body template object, inputting engineering information including the elevation of a bearing platform, the name of the foundation template, the grade of concrete, the model number and the quantity of reinforcing steel bars, and determining or modifying the position of a datum point of a pier foundation according to the specific position of the pier on a line, thereby forming a foundation information model called as a foundation template; when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the foundation, interactive drawing software or other third-party BIM software is needed to establish a foundation three-dimensional model under a local coordinate system, and a connection relation is established between the foundation three-dimensional model and a foundation template;
f. classifying all main beams in the railway bridge, respectively drawing two-dimensional geometric figures of a main beam longitudinal section, a main beam cross section and a main beam web plate of each type of main beam through interactive drawing software, combining the figures, correspondingly converting two-dimensional geometric figure objects of the main beam longitudinal section, the main beam cross section and the main beam web plate of each type of main beam into two-dimensional functional figure objects through the interactive drawing software, and forming a main beam information model called a main beam template after inputting engineering information including the name of the main beam template, the concrete grade, the type and the quantity of reinforcing steel bars; when the three two-dimensional functional graphic objects converted by a certain type of main beam cannot jointly and completely describe the three-dimensional geometric construction information corresponding to the main beam, an interactive drawing software or other third-party BIM software is required to establish a main beam three-dimensional model under a local coordinate system, and a connection relation is established between the main beam three-dimensional model and a main beam template;
g. establishing the vertical plane arrangement information and the plane arrangement information of the railway bridge in the form of a parameterized or two-dimensional functional graphic object;
h. and (c) generating a three-dimensional BIM model of the railway bridge by using interactive drawing software by combining all the information models obtained in the steps a to g and the three-dimensional model and the connection relation established under the special case condition, wherein the three-dimensional BIM model can be established in an interactive drawing system or third-party BIM modeling software.
The specific implementation mode of the step h comprises the following steps:
h-1, establishing a line plane central line model and a line vertical curve model of the line by using the line information model, wherein the line plane central line model and the line vertical curve model are combined with line broken link information and are used for calculating three-dimensional coordinates of a middle pile and a side pile of each mile pile number on the line;
h-2, analyzing and obtaining three-dimensional geometric construction information of a pier corresponding to each beam seam pile number and positioning information of the pier on a line by utilizing the constructed line information model, the top cap information model, the pier body information model, the basic information model, the girder information model, the vertical face arrangement information and the plane arrangement information of the railway bridge, wherein the three-dimensional geometric construction information comprises a top cap template, a pier body template, a basic template, a pier body length, a pile foundation length, curve eccentricity, pre-eccentricity, a left beam seam value, a right beam seam value, longitudinal eccentricity of the pier and a line spacing between a left line and a right line of the pier; analyzing to obtain a main beam template corresponding to the bridge pier with a given beam seam pile number on the large mileage side;
h-3, calculating the reference point of the top cap template, the pier body template and the basic template corresponding to each beam seam pile number on the line plane coordinate and the vertical elevation position, and the two end points of the main beam central line on the line plane coordinate and the vertical elevation position according to the established line plane central line model and vertical curve model, the three-dimensional geometric construction information of the pier corresponding to each beam seam pile number and the positioning information of the pier on the line, according to the main beam template corresponding to the pier with the given beam seam pile number on the big mileage side, and according to the principle of the bisection central vector method or tangent arrangement method of the railway bridge;
h-4, constructing a three-dimensional graph of the pier loaded with engineering information and a three-dimensional model of a girder between every two adjacent piers according to the model information of the top cap template where the pier of each beam joint pile number is located, the model information of the pier body template, the model information of the foundation template and the model information of the girder template, as well as the information of the pile foundation length of the foundation, the height of the pier body and the like in the arrangement information of the vertical face and the plane of the bridge, and sequentially positioning the piers and the girder at corresponding positions of the line in a translation and rotation calculation mode, thereby obtaining the three-dimensional information model of the three-dimensional BIM model of the railway bridge.
The "two-dimensional functional graphic object" referred to in the present invention is a two-dimensional graphic object in an interactive graphic system, having the following basic features:
1. the functional graphic object is a two-dimensional graphic object in an interactive graphic system, which has basically the same interactive geometric operation function as the traditional two-dimensional geometric graphic object, namely, can interact with a user in a graphic interactive mode, and can be selected, moved, deleted, copied, rotated, enlarged and reduced, arrayed, decomposed, combined and the like.
2. The functional graphic objects have diverse display states, but each type of functional graphic object has the same engineering attribute information and professional functions. The functional graphic object has its independent attribute dialog box as operation interface, the user can open the attribute dialog box by mouse single click or double click, the engineering information concerned by the user and various professional function button commands related to the graphic object are displayed on the attribute dialog box, and the professional functions related to the functional graphic object, such as calculating, inquiring, creating other functional graphic objects, etc., can be realized by operating the professional function button commands.
3. The functional graphic object creating method comprises the following three steps:
(1) creating a parameterization;
(2) automatically creating through other functional image objects;
(3) and (4) creating a forced conversion method.
The basic steps of creating the functional graphic object by the forced conversion method are as follows: firstly, one or more two-dimensional graphic objects need to be selected; secondly, the method converts the graphic objects into functional graphic objects with engineering attributes and professional functions through certain mouse operation. The key of the success of the forced conversion creation is that the geometric shape of the original graphic object and the line element relations of the vertical, the intersection, the parallel, the closed, the end point head connection, the two-point coincidence and the like between the line segments on the graphic object are analyzed and identified, the original graphic object can be converted into a corresponding functional graphic object after the engineering constraint condition is met, and corresponding engineering information is automatically loaded, so that the original graphic object has a certain professional function.
The method changes the BIM modeling process of the three-dimensional outline of the railway bridge into the process of simply operating the two-dimensional functional graphic object and locally modeling the three-dimensional model, thereby effectively solving the BIM modeling problem of the three-dimensional outline of the railway bridge, and realizing the simplification and the high efficiency of the BIM modeling process of the three-dimensional outline of the railway bridge.
Drawings
Fig. 1 and 2 are schematic views showing two types of bridge piers.
Fig. 3 is a geometry of the basic portion.
Fig. 4 is a top cross-sectional geometry of the pier shaft portion.
Fig. 5 is a top hat plan geometry.
Fig. 6 is a schematic diagram of the main parameter settings of the top cap.
Fig. 7 is a plan view of a longitudinal section of the main beam.
Fig. 8 is a plan view of a cross section of the main beam.
FIG. 9 is a plan view of a spar web.
Detailed Description
The invention relates to a two-dimensional railway bridge three-dimensional BIM rapid modeling method which comprises the following steps:
firstly, a line information model of a line section where a railway bridge is located is established according to line information including plane center line information, vertical curve information and line broken link information of the line.
The line information model comprises plane central line information, vertical curve information and line broken link information of the line. The line plane central line information is described by the intersection point coordinate of the line left line intersection point turning line, the curve radius and the gentle curve length at the intersection point and the pile number of a certain main point on the curve. The vertical curve information is described by the mileage of the variable slope point of the vertical curve, the radius of the curve and the elevation. The broken link information is described by the mileage before broken link and the mileage after broken link.
Secondly, as shown in fig. 1 and 2, the bridge pier of the railway bridge is decomposed into three components, namely a top cap 1, a pier body 2 and a foundation. The foundation of the pier comprises a pile foundation 31 and a bearing platform 32, wherein the bearing platform 32 can be a single-stage bearing platform (figure 1) or a multi-stage bearing platform (figure 2); the pier body 2 is a part from the minimum position of the top section of the pier body to the top surface of the bearing platform; the part above the pier body 2 is the top cap 1. Classifying all the top caps on all the piers according to the mode that the top caps are identical in shape and size and are classified into one type, drawing the two-dimensional geometric figure of each type of top cap by utilizing interactive drawing software, and combining the figures to form the two-dimensional geometric figure object of each type of top cap. Classifying all pier bodies of all piers according to the mode that the top sections of the pier bodies are the same, the longitudinal slope rates of the pier bodies are the same, and the transverse slope rates of the pier bodies are the same, namely classifying the pier bodies into one type, drawing two-dimensional geometric figures of each type of pier bodies by using interactive drawing software, and combining the figures to form a two-dimensional geometric figure object of each type of pier bodies. Classifying all foundations of all piers according to the mode that the diameters and the plane arrangement modes of pile foundations and the shapes and the sizes of bearing platforms are correspondingly the same, namely classifying the foundations into one type, drawing two-dimensional geometric figures of each type of foundation, combining the figures, and forming a two-dimensional geometric figure object of each type of foundation.
Thirdly, the basic template is created according to the following steps:
3-1, using interactive drawing software to draw two-dimensional geometric figures formed by the plane outline of the bearing platform and the plane outline of the pile foundation, and combining the two-dimensional geometric figures into a figure whole, namely a basic two-dimensional geometric figure object (figure 3). In fig. 3, 34 is a plane contour of a pile foundation, 36 is a first-stage bearing platform contour, 35 is a second-stage bearing platform contour, the merged figure becomes a two-dimensional geometric figure of a pier foundation, and a datum point 37 is marked, namely a two-dimensional geometric figure object forming the foundation.
3-2, selecting the two-dimensional geometric figure object drawn in the step 3-1, converting the two-dimensional geometric figure object into a two-dimensional functional figure object by using interactive drawing software, opening an attribute dialog box, inputting engineering information such as the elevation of each stage of bearing platform, the name of a basic template, the grade of concrete, the model number and the quantity of reinforcing steel bars and the like, and determining or modifying the position of a reference point of a pier foundation according to the specific position of the pier on a line to form a top cap information model which is the basic template.
The reference point of the 3-3 basic template is a positioning point of the bridge pier corresponding to the basic template arranged on the central line of the line plane, the default reference point is positioned at the center of the basic template, and the default reference point can be modified according to the actual plane relation of the bridge pier and the line.
3-4, when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the foundation, the interactive drawing software or other third-party BIM software is needed to establish a foundation three-dimensional model under a local coordinate system, and a connection relation is established between the foundation three-dimensional model and a foundation template.
Fourthly, the pier body template is created according to the following steps:
4-1, drawing the two-dimensional geometric figure of the top section of the pier body by using interactive drawing software (figure 4), and combining the two-dimensional geometric figures into a figure whole, namely the two-dimensional geometric figure object of the pier body.
4-2, selecting the two-dimensional geometric figure object drawn in the step 4-1, converting the two-dimensional geometric figure object into a two-dimensional functional figure object by using interactive drawing software, opening an attribute dialog box, inputting engineering information such as the longitudinal slope rate of the pier body, the transverse slope rate of the pier body, the name of the pier body template, the grade of concrete, the model number and the quantity of reinforcing steel bars and the like, and determining or modifying the position of the datum point of the pier body of the pier according to the specific position of the pier on the line, thereby forming a pier body information model, namely the pier body template.
4-3 the datum point of the pier body template in the step 4-2 is a positioning point at which the pier corresponding to the pier body template is arranged on the central line of the line plane, the default datum point is positioned at the center of the pier body template, and the datum point can be modified according to the actual plane relationship between the pier and the line.
4-4, when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the pier body, establishing a three-dimensional model of the pier body under a local coordinate system by using interactive drawing software or other third-party BIM software, and establishing a connection relation with the pier body template.
Fifthly, the top cap template is created according to the following steps:
5-1, utilizing interactive drawing software to draw two-dimensional geometric figures of a top hat plane formed by the top hat outline, the top hat bottom surface outline, the cushion outline and the high-low platform boundary, and combining the two-dimensional geometric figures into a whole figure, namely the two-dimensional geometric figure object of the top hat (figure 5).
5-2, selecting the two-dimensional geometric figure object drawn in the step 5-1, converting the two-dimensional geometric figure object into a two-dimensional functional figure object by using interactive drawing software, opening an attribute dialog box, inputting engineering information such as top cap parameters, top cap template names, concrete grades, steel bar models and quantities, and determining or modifying the position of a reference point of a top cap of a pier according to the specific position of the pier on a line, thereby forming a top cap information model, namely the top cap template. The main parameter designations for the top hat are shown in fig. 6.
5-3, the reference point of the top cap template in the step 5-2 is a positioning point of the pier corresponding to the top cap template arranged on the central line of the line plane, the default reference point is positioned at the center of the top cap template, and the default reference point can be modified according to the actual plane relationship between the pier and the line.
5-4, when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the top cap, establishing a top cap three-dimensional model under a local coordinate system by using interactive drawing software or other third-party BIM software, and establishing a connection relation with a top cap template.
Sixthly, the main beam template is created according to the following steps:
6-1, classifying all the main beams of the railway bridge in a mode of same shape and structure and consistent size, namely classifying the main beams into one type, drawing a two-dimensional geometric figure (figure 7) of the main beam longitudinal section of each type of main beam through interactive drawing software, and combining the two-dimensional geometric figures into a whole to form a two-dimensional geometric figure object of the main beam longitudinal section; the two-dimensional geometric figure of the longitudinal section of the girder is forcibly converted into a two-dimensional functional figure object of the longitudinal section of the girder through interactive drawing software, an attribute dialogue window is opened, and engineering information such as the name of a girder template, the grade of concrete, the type and the quantity of reinforcing steel bars and the like is input.
6-2, drawing the two-dimensional geometric figure (figure 9) of the cross section of a certain section position of each type of main beam through interactive drawing software, combining the two-dimensional geometric figure into a whole figure to form a two-dimensional geometric figure object of the cross section of the main beam, and forcibly converting the two-dimensional geometric figure object into a two-dimensional functional figure object of the cross section of the main beam through the interactive drawing software.
6-3, drawing the two-dimensional geometric figure (figure 8) of the main beam web plate of each type of main beam through interactive drawing software, combining the two-dimensional geometric figure into a whole figure to form the two-dimensional geometric figure object of the main beam web plate, and forcibly converting the two-dimensional geometric figure object into the two-dimensional functional figure object of the main beam web plate through the interactive drawing software.
The three two-dimensional functional graphic objects and the input engineering information together form a girder information model of the girder, namely a girder template. Of course, the engineering information can also be input in the two-dimensional functional graphic object of the cross section of the main beam or the attribute dialog box of the two-dimensional functional graphic object of the web plate of the main beam; and can also be input at other relevant positions of the software.
When the main beam template cannot completely describe the three-dimensional geometric construction information of a certain type of main beam, interactive drawing software or other third-party BIM software is required to be used for establishing a main beam three-dimensional model under a local coordinate system, and a connection relation is established between the main beam three-dimensional model and the main beam template.
And seventhly, building the vertical plane arrangement information and the plane arrangement information of the railway bridge in the form of a parameterized or two-dimensional functional graphic object.
The line plane central line information is described by the intersection point coordinates of the intersection point turning line of the left line (or the right line) of the line, the curve radius and the gentle curve length at the intersection point and the pile number of a certain main point on the curve; the vertical curve information is described by the mileage of a variable slope point of a vertical curve, the radius of the curve and the elevation; the broken link information is described by the mileage before broken link and the mileage after broken link.
The bridge plane arrangement information and the vertical plane arrangement information comprise various engineering information including beam joint mileage pile numbers of all piers of the railway bridge, a foundation template corresponding to each pier, a pier body template, a top cap template, a main beam template on the large mileage side of the pier, a left beam joint width, a right beam joint width, curve eccentricity, curve pre-eccentricity, curve longitudinal eccentricity, pile foundation length and pier body height. The bridge layout information may be expressed using two-dimensional functional graphic objects.
And eighthly, combining all the information models obtained in the first step to the seventh step and the three-dimensional models and connection relations established under special conditions, and automatically generating the Revit three-dimensional BIM model of the railway bridge by utilizing Revit software.
The specific implementation steps are as follows:
and 8-1, creating a line plane central line model and a line vertical curve model of the line by using the line information model constructed in the first step, wherein the line plane central line model and the line vertical curve model are combined with line broken link information and are used for calculating three-dimensional coordinates of middle piles and side piles of each milepost number on the line.
8-2 when the top cap template can not completely describe the three-dimensional geometric construction information of the corresponding top cap class, constructing a top cap family under a local coordinate system by utilizing the family technology of Revit software, and storing the top cap family in a corresponding family file. When the pier body template and the pier body height information cannot completely describe the three-dimensional geometric construction information of the corresponding pier body class, a pier body family under a local coordinate system can be constructed by utilizing the family technology of Revit software and stored in a corresponding family file. When the three-dimensional geometric construction information of the corresponding foundation class cannot be completely described by the foundation template and the pile foundation length information, a foundation family under a local coordinate system can be constructed by utilizing the family technology of Revit software and stored in a corresponding family file. When the three-dimensional geometric construction information of the corresponding main beam class cannot be completely described by the main beam template, a main beam family under a local coordinate system can be constructed by utilizing the family technology of Revit software and stored in a corresponding family file.
8-3, analyzing and obtaining three-dimensional geometric construction information of a pier corresponding to each beam seam pile number and positioning information of the pier on a line by using the constructed line information model, the top cap information model, the pier body information model, the basic information model, the girder information model, the bridge vertical surface and the plane arrangement information model, wherein the three-dimensional geometric construction information mainly comprises a top cap template, a pier body template, a basic template, a pier body length and a pile foundation length corresponding to the pier, the curve eccentricity, the pre-eccentricity, the left beam seam value, the right beam seam value and the longitudinal eccentricity of the pier at the position of the pier, and the line spacing between the left line and the right line of the pier; and analyzing to obtain the main beam template correspondingly used by the bridge pier with the given beam seam pile number on the large mileage side.
8-4, calculating the reference point of the top cap template, the pier body template and the base template corresponding to each beam seam pile number on the line plane coordinate and the vertical elevation position, and the two end points of the main beam central line on the line plane coordinate and the vertical elevation position according to the three-dimensional geometric construction information of the pier corresponding to each beam seam pile number and the positioning information of the pier on the line, the main beam template corresponding to the pier with the given beam seam pile number on the big mileage side, the bisection vector method or tangent arrangement method principle of the railway bridge and the influences of the eccentricity, pre-eccentricity and longitudinal eccentricity of the pier curve.
8-5, constructing a three-dimensional graph of the pier loaded with engineering information and a main beam three-dimensional model between every two adjacent piers according to the model information of the top cap template where the pier of each beam seam pile number is located, the model information of the pier body template, the model information of the foundation template and the model information of the main beam template, as well as the information of the pile foundation length, the pier body height and the like in the arrangement information of the vertical face and the plane of the bridge, and sequentially positioning the piers and the main beam at corresponding positions of the line in a translation, rotation and other calculation modes, thereby obtaining the three-dimensional information model of the three-dimensional BIM model of the railway bridge.
By utilizing Revit plug-in technology, the three-dimensional information model of the three-dimensional BIM model of the railway bridge can be converted into the three-dimensional BIM model of Revit, and for a top cap template family, a pier body template family, a basic template family or a girder template family which constructs a family file, corresponding parts in the Revit three-dimensional model can be replaced, so that the three-dimensional BIM model of the railway bridge can be quickly established.
Claims (6)
1. A two-dimensional railway bridge three-dimensional BIM rapid modeling method is characterized by comprising the following steps:
a. establishing a line information model of a line section where the railway bridge is located according to line information including planar central line information, vertical curve information and line broken link information of the line;
b. decomposing all piers in the railroad bridge into three components of a top cap, a pier body and a foundation, classifying the top cap, the pier body and the foundation respectively according to the difference of structures, shapes and/or sizes, drawing two-dimensional geometric figures of each type of top cap, each type of pier body and each type of foundation respectively by utilizing interactive drawing software, combining the figures, and correspondingly forming a two-dimensional geometric figure object of each type of top cap, a two-dimensional geometric figure object of each type of pier body and a two-dimensional geometric figure object of each type of foundation;
c. converting the two-dimensional geometric figure object of each type of top cap into a two-dimensional functional figure object through interactive drawing software to form a top cap template object, and inputting engineering information including top cap parameters, the name of the top cap template, the grade of concrete, the type and the number of reinforcing steel bars to form a top cap information model called a top cap template; when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the top cap, an interactive drawing software or other third-party BIM software is needed to establish a top cap three-dimensional model under a local coordinate system, and a connection relation is established between the top cap three-dimensional model and a top cap template;
d. converting the two-dimensional geometric figure object of each pier body into a two-dimensional functional figure object through interactive drawing software to form a pier body template object, inputting engineering information including the longitudinal gradient rate of the pier body, the transverse gradient rate of the pier body, the name of the pier body template, the grade of concrete, the model number and the quantity of reinforcing steel bars, and determining or modifying the position of a datum point of the pier body according to the specific position of the pier body on a line, thereby forming a pier body information model called as a pier body template; when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the pier body, an interactive drawing software or other third-party BIM software is needed to establish a three-dimensional model of the pier body under a local coordinate system, and a connection relation is established between the three-dimensional model and a pier body template;
e. converting the two-dimensional geometric figure object of each type of foundation into a two-dimensional functional figure object through interactive drawing software to form a pier body template object, inputting engineering information including the elevation of a bearing platform, the name of the foundation template, the grade of concrete, the model number and the quantity of reinforcing steel bars, and determining or modifying the position of a datum point of a pier foundation according to the specific position of the pier on a line, thereby forming a foundation information model called as a foundation template; when the converted two-dimensional functional graphic object can not completely describe the three-dimensional geometric construction information of the foundation, interactive drawing software or other third-party BIM software is needed to establish a foundation three-dimensional model under a local coordinate system, and a connection relation is established between the foundation three-dimensional model and a foundation template;
f. classifying all main beams in the railway bridge, respectively drawing two-dimensional geometric figures of a main beam longitudinal section, a main beam cross section and a main beam web plate of each type of main beam through interactive drawing software, combining the figures, correspondingly converting two-dimensional geometric figure objects of the main beam longitudinal section, the main beam cross section and the main beam web plate of each type of main beam into two-dimensional functional figure objects through the interactive drawing software, and forming a main beam information model called a main beam template after inputting engineering information including the name of the main beam template, the concrete grade, the type and the quantity of reinforcing steel bars; when the three two-dimensional functional graphic objects converted by a certain type of main beam can not jointly and completely describe the three-dimensional geometric construction information corresponding to the main beam, establishing a main beam three-dimensional model under a local coordinate system by using interactive drawing software or other third-party BIM software, and establishing a connection relation with a main beam template;
g. establishing the vertical plane arrangement information and the plane arrangement information of the railway bridge in the form of a parameterized or two-dimensional functional graphic object;
h. generating a three-dimensional BIM model of the railway bridge by using interactive drawing software by combining all the information models obtained in the steps a to g and the three-dimensional models and the connection relations established under special conditions;
the two-dimensional functional graphic object is a two-dimensional graphic object in an interactive graphic system having the following basic features:
c1, having interactive geometric operation function substantially the same as that of the traditional two-dimensional geometric figure object;
c2, and each type of functional graphic object has the same engineering attribute information and professional function.
2. The three-dimensional BIM rapid modeling method for the two-dimensional railroad bridge according to claim 1, wherein the plane centerline information of the line is described by the intersection point coordinates of the turning lines of the intersection points of the left line or the right line of the line, the curve radius and the curve length at the intersection point, and the pile number of a certain main point on the curve; the vertical curve information is described through the mileage of a variable slope point of a vertical curve, the radius of the curve and the elevation; the chain breakage information is described by the mileage before chain breakage and the mileage after chain breakage.
3. The three-dimensional BIM rapid modeling method for the two-dimensional railroad bridge as claimed in claim 1, wherein the top caps on the piers are classified in a way that the top caps are the same in shape and the same in size, namely, the top caps are classified into one type; the classification mode of the pier bodies on the piers is classified according to the mode that the top sections of the pier bodies are the same, the longitudinal slope rates of the pier bodies are the same, and the transverse slope rates of the pier bodies are the same, namely the pier bodies are classified into one class; the classification mode of the foundation on the pier is classified according to the mode that the diameter and the plane arrangement mode of the pile foundation and the shape and the size of the bearing platform are correspondingly the same, namely the foundation is classified into one type.
4. The method as claimed in claim 1, wherein the main girders of the railroad bridge are classified in the same shape and structure and in the same size.
5. The method of claim 1, wherein the bridge plane layout information and the vertical plane layout information include engineering information including a bridge joint mile pile number of each bridge pier of the railroad bridge, a base template corresponding to each bridge pier, a pier body template, a top cap template, a main beam template on a large mile side of the bridge pier, a left beam joint width, a right beam joint width, a curve eccentricity, a curve pre-eccentricity, a curve longitudinal eccentricity, a pile foundation length, and a pier body height.
6. The method for the two-dimensional railway bridge three-dimensional BIM rapid modeling according to claim 1, wherein the specific implementation manner of the step h comprises the following steps:
h-1, establishing a line plane central line model and a line vertical curve model of the line by using the line information model, wherein the line plane central line model and the line vertical curve model are combined with line broken link information and are used for calculating three-dimensional coordinates of a middle pile and a side pile of each mile pile number on the line;
h-2, analyzing and obtaining three-dimensional geometric construction information of a pier corresponding to each beam seam pile number and positioning information of the pier on a line by utilizing the constructed line information model, the top cap information model, the pier body information model, the basic information model, the girder information model, the vertical face arrangement information and the plane arrangement information of the railway bridge, wherein the three-dimensional geometric construction information comprises a top cap template, a pier body template, a basic template, a pier body length, a pile foundation length, curve eccentricity, pre-eccentricity, a left beam seam value, a right beam seam value, longitudinal eccentricity of the pier and a line spacing between a left line and a right line of the pier; analyzing to obtain a main beam template corresponding to the bridge pier with a given beam seam pile number on the large mileage side;
h-3, calculating the reference points of the top cap template, the pier body template and the base template corresponding to each beam seam pile number on the line plane coordinate and the vertical elevation position, and the plane coordinate and the vertical elevation position of two end points of the center line of the main beam on the line according to the established line plane center line model and vertical curve model, the three-dimensional geometric construction information of the pier corresponding to each beam seam pile number and the positioning information of the pier on the line, and the main beam template corresponding to the pier with the given beam seam pile number on the big mileage side;
h-4, according to the model information of the top cap template where the pier of each beam seam pile number is located, the model information of the pier body template, the model information of the foundation template and the model information of the girder template, as well as the pile foundation length of the foundation and the height information of the pier body in the bridge vertical face and plane arrangement information, constructing a three-dimensional graph of the pier loaded with engineering information and a three-dimensional model of the girder between every two adjacent piers, and sequentially positioning the piers and the girder at corresponding positions of the line in a translation and rotation calculation mode, thereby obtaining the three-dimensional information model of the three-dimensional BIM model of the railway bridge.
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