BIM rapid modeling method for railway bridge

Abstract

The present application relates to a kind of bridge construction methods, specifically the BIM rapid modeling method of railway bridge, it includes the following steps: according to the design data of the broken chain table, vertical curve and line plane center line of construction project site, first establish broken chain table model, vertical curve model and line plane center line model;Then establish the bridge comprehensive layout table of construction project, foundation type statistical table, pier type statistical table and beam type statistical table;Again establish corresponding foundation type object, pier type object and beam type object;Finally establish railway bridge three-dimensional BIM model, through railway bridge three-dimensional BIM model, the pier and beam plane of railway bridge is arranged to line plane center line bridge plane simulation lofting chart, and accordingly establish pier elevation layout chart.The present application realizes the simplification, standardization and high efficiency of railway bridge BIM modeling, and can be suitable for the three-dimensional BIM modeling of ordinary railway and high-speed railway bridge.

Description

TECHNICAL FIELD

[0001] The present application relates to a bridge construction method, in particular to a BIM rapid modeling method of a railway bridge. BACKGROUND

[0002] BIM modeling of a railway bridge is the basis of digital technology application in railway bridge construction. At present, BIM modeling of a railway bridge is generally carried out by using Revit (Autodesk), CATIA (Dassault) or Bentley OpenBuildings, etc. international BIM software; or by developing some plug-ins to realize BIM modeling of a railway bridge. However, the modeling method using international BIM software still has some deficiencies in expressing design characteristics and habits of a railway bridge and in deepening application in subsequent construction stages, and there is still a lack of BIM software that can be deeply applied to the construction of a railway bridge on site in China.

[0003] In the patent of the applicant's previous application on the two-dimensional railway bridge three-dimensional BIM rapid modeling method, a modeling method of using a series of functional graphic objects (including basic templates, top cap templates, pier body templates, main beam templates, line information models, line plane and elevation arrangement information models, etc.) to quickly build a BIM model of a railway bridge is proposed. This modeling method of a railway bridge BIM model uses basic templates, top cap templates, pier body templates, main beam templates, etc., which are functional graphic objects with two-dimensional geometric features. Since it cannot support three-dimensional modeling and editing functions of each part of a railway bridge, its three-dimensional BIM model needs to rely on the family technology of Revit and other international BIM software and a three-dimensional graphic platform, which will lead to problems in modeling efficiency, collaboration and adaptability of the BIM modeling of a railway bridge, and is not conducive to the improvement of digital application technology of railway bridge construction. SUMMARY

[0004] The purpose of the present application is to provide a BIM rapid modeling method of a railway bridge to improve the simplicity, standardization and efficiency of BIM modeling of a railway bridge.

[0005] The purpose of the present application is achieved as follows:

[0006] A BIM rapid modeling method of a railway bridge, comprising the following steps:

[0007] S1, establishing a line model: according to the design data of the chain table, vertical curve and line plane center line of the site of the construction project, a chain table model, a vertical curve model and a line plane center line model are respectively established on a graphic page by using a parameterization method.

[0008] S2, establishing bridge information table: establishing the bridge information table of the construction project including the bridge comprehensive layout table, foundation type statistical table, pier type statistical table and beam type statistical table on the graphic page.

[0009] S3, establishing bridge part type object: according to the bridge information table and the construction project design data, the corresponding foundation type object, pier type object and beam type object are established.

[0010] S4, establishing railway bridge three-dimensional BIM model: according to the established foundation type object, pier type object and beam type object, the bridge three-dimensional assembly object is established on the graphic page, and the associated line plane center line name and beam top distance rail surface height difference are set on the preset interface, then the names of the associated bridge comprehensive layout table, foundation type statistical table, pier type statistical table and beam type statistical table are set; finally, the railway bridge three-dimensional BIM model is assembled.

[0011] S5, through the railway bridge three-dimensional BIM model, the pier and beam plane layout of the railway bridge are laid on the bridge plane simulation lofting drawing of the line plane center line, and the pier elevation layout drawing is established accordingly.

[0012] The BIM rapid modeling method of the railway bridge is a rapid modeling method capable of deeply reflecting the BIM construction and layout characteristics of the railway bridge. On the basis of inheriting the basic functions such as line plane center line, vertical curve and chain table in the existing invention patent, specific functional graphic objects such as three-dimensional geometric object, foundation type object, pier body type object, top cap type object, pier type object, cushion stone type object, bridge comprehensive layout table, beam type statistical table, pier type statistical table and foundation type statistical table are added. The three-dimensional geometric object, foundation type object, pier body type object, cushion stone type object, pier type object, top cap type object and beam type object are essentially two-dimensional functional graphic objects as basic operation objects, supporting three-dimensional modeling, display and editing functions, and the corresponding three-dimensional BIM model can complete three-dimensional BIM modeling, editing and display of various complex bridge parts without the help of Revit and other international BIM software family technology and three-dimensional graphic platform, realizing the simplification, standardization and high efficiency of railway bridge BIM modeling.

[0013] The application realizes a two-dimensional-based three-dimensional modeling method, provides three-dimensional operation and graphic display to two-dimensional functional graphic objects, so that the railway bridge BIM modeling work is more simplified, standardized and efficient. The application can be applied to three-dimensional BIM modeling of ordinary railway bridges and high-speed railway bridges. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the substructure of the railway bridge.

[0015] Figure 2 is a three-dimensional geometry of a top hat that is two-dimensionalized.

[0016] Figure 3 is Figure 2 a three-dimensional geometry of a top hat.

[0017] Figure 4 is a three-dimensional geometry of a top hat; where (a) is a front view, (b) is a right view, (c) is a top view, (d) is a bottom view.

[0018] Figure 5 is a top view of a three-dimensional geometry of a top hat; where (a) is a view before the view base point is moved, (b) is a view after the view base point is moved to the end point of the indicated line.

[0019] Figure 6 is a three-dimensional geometry of a top hat; where (a) is a three-dimensional geometry of a hollow pier body, (b) is a three-dimensional geometry of a top hat, (c) is a three-dimensional geometry of a No. 0 block.

[0020] Figure 7 is a three-dimensional geometry of a top hat; where (a) is a three-dimensional geometry of a hollow pier body, (b) is a three-dimensional geometry of a top hat, (c) is a three-dimensional geometry of a No. 0 block.

[0021] Figure 8 is a three-dimensional geometry of a top hat; where (a) is a three-dimensional geometry of a hollow pier body, (b) is a three-dimensional geometry of a top hat, (c) is a three-dimensional geometry of a No. 0 block.

[0022] Figure 9 is a three-dimensional geometry of a top hat; where (a) is a three-dimensional geometry of a hollow pier body, (b) is a three-dimensional geometry of a top hat, (c) is a three-dimensional geometry of a No. 0 block. Figure 8

[0023] Figure 10 is a three-dimensional geometry of a top hat; where (a) is a three-dimensional geometry of a hollow pier body, (b) is a three-dimensional geometry of a top hat, (c) is a three-dimensional geometry of a No. 0 block.

[0024] Figure 11 is a three-dimensional geometry of a top hat; where (a) is a three-dimensional geometry of a hollow pier body, (b) is a three-dimensional geometry of a top hat, (c) is a three-dimensional geometry of a No. 0 block.

[0025] Figure 12 is a three-dimensional geometry of a top hat; where (a) is a three-dimensional geometry of a hollow pier body, (b) is a three-dimensional geometry of a top hat, (c) is a three-dimensional geometry of a No. 0 block. Figure 11

[0026] Figure 13 ​​are three-dimensional graphics of three types of objects of top hat type established by forced conversion; wherein (a) is a top hat type object cut by a pin, (b) is a top hat type object with high and low piers, and (c) is a top hat type object with gate-shaped piers.

[0027] Figure 14 are schematic diagrams of a pier body type object; wherein (a) is a front view, (b) is a right view, and (c) is a top view.

[0028] Figure 15 are Figure 14 three-dimensional graphics of the pier body type object shown.

[0029] Figure 16 are schematic diagrams of a bridge pier type object; wherein (a) is a front view, (b) is a right view, and (c) is a top view.

[0030] Figure 17 are Figure 16 three-dimensional graphics of the bridge pier type object shown.

[0031] Figure 18 are schematic diagrams of the assembly of a bridge pier type object according to a base point alignment mode; wherein (a) is a three-view diagram of a pier cap type object, (b) is a three-view diagram of a top hat type object, (c) is a three-view diagram of a pier body type object, and (d) is a three-view diagram of a bridge pier type object after the assembly of components.

[0032] Figure 19 are schematic diagrams of the assembly of a bridge pier type object according to a planar assembly mode; wherein (a) is a three-view diagram of a pier cap type object and a top hat type object after assembly, (b) is a three-view diagram of a pier body type object, and (c) is a three-view diagram of a bridge pier type object after the assembly of components.

[0033] Figure 20 are schematic diagrams of a bridge pier type object with a base point adjustment indicating line; wherein (a) is a front view, (b) is a right view, and (c) is a top view.

[0034] Figure 21 are schematic diagrams of a bridge pier type object after base point adjustment; wherein (a) is a front view, (b) is a right view, and (c) is a top view.

[0035] Figure 22 is a front view of a beam body type object.

[0036] Figure 23 are Figure 22 three-dimensional graphics of the beam body type object shown.

[0037] Figure 24 is a schematic diagram of a comprehensive bridge layout.

[0038] Figure 25Is the basic type statistical representation intention.

[0039] Figure 26 Is the bridge pier type statistical representation intention.

[0040] Figure 27 Is the main girder type statistical representation intention.

[0041] Figure 28 Is the bridge three-dimensional assembly object schematic diagram.

[0042] Figure 29 Is the railway bridge three-dimensional BIM model schematic diagram.

[0043] Figure 30 Is the bridge plane simulation lofting diagram.

[0044] Figure 31 Is the bridge pier elevation layout. DETAILED DESCRIPTION

[0045] Several explanations and descriptions:

[0046] I, the attribute editing method of the functional graphic object involved in the present application is that for the established functional graphic object, the attribute information of the functional graphic object can be set through its operation interface to obtain the required functional graphic object and display state, and this method of modifying the functional graphic object can be simply referred to as the attribute editing method.

[0047] II, the railway bridge substructure involved in the present application refers to the general term of pile foundation, pile cap, pier body, top hat and cushion stone; among them, the pile foundation and the pile cap are collectively referred to as the foundation part; the pier body, the top hat and the cushion stone are collectively referred to as the pier part. Figure 1 As shown, it is the railway bridge substructure, in the substructure, G1 is the top hat and cushion stone part of the pier, G2 is the pier body part of the pier, and G3 is the foundation part. The top hat and cushion stone part of the pier includes the top hat P2 and the cushion stone P1 arranged on the top hat. The pier body part only includes the pier body P3. The foundation part includes the pile cap P4 and the pile foundation P5 supporting the pile cap.

[0048] III, the three-dimensional geometric body involved in the present application is a kind of functional graphic object, and its basic characteristics are as follows:

[0049] (1) The three-dimensional geometric body is a kind of functional graphic object displayed as two-dimensional in the graphic system, and its preset operation interface can display the three-dimensional entity graphics of the three-dimensional geometric body, each three-dimensional geometric body has a three-dimensional local Cartesian coordinate system X-Y-Z, and the coordinate origin of the coordinate system is also called "base point". Figure 2 As shown, it is a two-dimensional display of the top hat three-dimensional geometric body. Figure 3The three-dimensional entity object displayed on the operation interface of the functional graphic object is a three-dimensional geometric body, wherein L1 is a local Cartesian coordinate system XYZ, and the origin of the coordinate system is the base point.

[0050] (2) The three-dimensional geometric body can be obtained by stretching, fusing, lofting, rotating, arraying, shearing and merging, assembling, and other general three-dimensional graphic drawing and editing methods.

[0051] (3) The three-dimensional geometric body is displayed as a two-dimensional functional graphic object in the graphic system, and can be displayed as a certain view of six views, i.e., front view, rear view, left view, right view, top view, and bottom view. In each view, there are also two coordinate axes of the local coordinate system on the view, and the intersection of the two coordinate axes corresponds to the projection of the base point of the three-dimensional geometric body on the view, which is referred to as "view base point" here. Figure 4 The four-way view of the top-hat three-dimensional geometric body is given, wherein, Figure 4 (a) is the front view, Figure 4 (b) is the right view, Figure 4 (c) is the top view, Figure 4 (d) is the bottom view.

[0052] (4) The base point of the three-dimensional geometric body can be adjusted by moving the view base point, and the specific operation method can be as follows: one is to drag the view base point to the target position by using the mouse dragging method; two is to move the view base point to the target position by giving the movement parameters; three is to draw an indication line with one end point as the target position, and the view base point can also be moved to the target position by button operation on the preset interface. Figure 5 The view base point in the top view of the top-hat three-dimensional geometric body is moved, wherein, Figure 5 (a) is the case before the view base point is moved, and the end point of the indication line L2 gives the target position to which the view base point needs to be moved; Figure 5 (b) is the case after the view base point is moved.

[0053] (5) As shown in Figure 6 , on the operation interface of a three-dimensional geometric body, an option can be set to determine whether the three-dimensional geometric body is a solid or a hollow body. For a three-dimensional solid, the view line segment is a solid line; for a three-dimensional hollow body, the view line segment is represented by a dashed line.

[0054] (6) Multiple three-dimensional geometric bodies can be selected for shearing and merging operation to obtain three-dimensional geometric bodies processed by difference set and union set. When the three-dimensional geometric body is a hollow body, difference set processing is needed; when the three-dimensional geometric body is a solid, union set processing is needed.

[0055] (7) When the multiple three-dimensional geometrical bodies are all solid, they can be selected for assembly operation to obtain an assembly body composed of the multiple three-dimensional geometrical bodies, which is also a three-dimensional geometrical body. Through operation on the preset interface, the assembly body can be restored into an independent three-dimensional geometrical body.

[0056] (8) When a three-dimensional geometrical body of an engineering part needs to be obtained through shearing and merging or assembly of three-dimensional geometrical bodies of multiple component parts, the following two modes can be selected:

[0057] a. The three-dimensional geometrical bodies of the component parts are first established, and then the established three-dimensional geometrical bodies are set as top views and arranged according to the given plane positions, and the view base points are dragged or moved to a horizontal line; then the three-dimensional geometrical bodies are switched to front views and arranged according to the given elevation positions, and then the three-dimensional geometrical bodies are selected for shearing and merging or assembly operation to obtain the three-dimensional geometrical body of the corresponding engineering part.

[0058] b. The three-dimensional geometrical bodies of the component parts are first established, and then the established three-dimensional geometrical bodies are set as front views and arranged according to the elevation positions, and the view base points are dragged or moved to a horizontal line; then the three-dimensional geometrical bodies are switched to top views and arranged according to the given plane positions; and then the three-dimensional geometrical bodies are selected for shearing and merging or assembly operation to obtain the three-dimensional geometrical body of the corresponding engineering part.

[0059] Figure 6 The three three-dimensional geometrical bodies shown are the three-dimensional geometrical bodies of the three engineering parts constructed; wherein, Figure 6 (a) is a three-dimensional geometrical body of a hollow pier body, Figure 6 (b) is a three-dimensional geometrical body of a top hat, Figure 6 (c) is a three-dimensional geometrical body of a No. 0 block. Through shearing and merging or assembly operation of the three-dimensional geometrical bodies, complex and various three-dimensional geometrical bodies can be established. Through shearing and merging, assembly, chamfering and other operations, three-dimensional geometrical bodies of various complex and various engineering structures can be obtained.

[0060] Four, the basic type object involved in the present application is a functional graphic object, and the basic characteristics are as follows:

[0061] (1) The bearing platform and the pile foundation jointly constitute the foundation part of the lower structure of the railway bridge, and the basic type object is a functional graphic object expressed by two-dimensional three views containing the bearing platform and the pile foundation part. If such a functional graphic object appears in the comprehensive layout drawing of a bridge, it indicates that the pile foundation diameter and the plane arrangement of the pile foundation and the structure and size of the bearing platform are consistent except that the length of the pile foundation can be different. Figure 7 The shown is a basic type object, and the two-dimensional graphic contains three views, wherein, Figure 7(a) is a front view, Figure 7 (b) is a right view, Figure 7 (c) is a top view.

[0062] (2) The base type object can be created by parameterization method and two-dimensional or three-dimensional forced conversion method. The specific way of creating the base type object by parameterization method is that according to the base type statistical table and the design data of the construction project, the size parameters of the pile cap and pile foundation structure are input on the preset interface, and then the base type object is established on the graphic page. The specific way of creating the base type object by two-dimensional forced conversion method is that according to the base type statistical table and the design data of the construction project, the two-dimensional contour planar graph of the pile cap and pile foundation is first drawn in the graphic system, and then the graph is combined into a block and forcedly converted into the base type object. On the preset operation interface of the base type object, the pile cap height and the pile cap pile foundation concrete grade and other attribute information can be set. The specific way of creating the base type object by three-dimensional forced conversion method is that according to the base type statistical table and the design data of the construction project, the three-dimensional geometric body of the pile cap and pile foundation is first established in the graphic system by using three-dimensional geometric modeling method, and then the three-dimensional geometric body is forcedly converted into the base type object.

[0063] Figure 8 (a) is a contour planar graph of the pile cap and pile foundation; Figure 8 (b) is a base type object obtained by forced conversion. Figure 9 is a three-dimensional graph displayed after the base type object is forcedly converted on the preset interface.

[0064] (3) The attribute information of the base type object includes the name of the base type object, the height of each level of the pile cap, the length of each pile foundation, the concrete grade of the pile cap and the concrete grade of the pile foundation, and the like. These attribute information can be set on the preset interface.

[0065] Five, the cushion stone type object involved in the application is a functional graphic object, and its basic characteristics are as follows:

[0066] (1) The cushion stone type object is a functional graphic object represented by two-dimensional three views, which is used to represent the same type of cushion stone in the arrangement of a bridge, and the structure and size are consistent.

[0067] (2) The cushion stone type object can be established by parameterization method and forced conversion method. The specific way of establishing the cushion stone type object by parameterization method is that the size parameters of the cushion stone are input on the preset interface, and then the cushion stone type object is established on the graphic page. The specific way of establishing the cushion stone type object by two-dimensional forced conversion method is that the two-dimensional contour planar graph of the cushion stone is first drawn in the graphic system, and then the graph is combined into a block and forcedly converted into the cushion stone type object.

[0068] Figure 10The shown is the establishment process of the cushion stone type object. Among them, Figure 10 (a) is the two-dimensional planar graph of the cushion stone before forced conversion; Figure 10 (b) is the three-view of the cushion stone type object obtained after forced conversion; Figure 10 (c) is the three-dimensional graph of the cushion stone type object obtained by forced conversion and can be displayed and inquired on the preset interface.

[0069] (3) On the preset operation interface of the cushion stone type object, the height and concrete grade of the cushion stone and other attribute information can be set, and the three-dimensional graph of the cushion stone type object is displayed and inquired.

[0070] (4) As shown in Figure 10 (c), there is a local Cartesian coordinate and corresponding base point on the three-dimensional graph of the cushion stone type object.

[0071] (5) The attribute information of the cushion stone type object includes the name of the cushion stone type object, the height and concrete grade of each cushion stone block, etc. The attribute information can be set on the preset interface.

[0072] Six, the top hat type object involved in the present application is a functional graphic object, and its basic characteristics are as follows:

[0073] (1) The top hat type object is a functional graphic object represented by a two-dimensional three-view to represent the top hat part, which appears in a comprehensive layout of a bridge, indicating that the structure and size of the top hat are consistent.

[0074] Figure 11 The shown is the three-view of the top hat type object; among them, Figure 11 (a) is the front view, Figure 11 (b) is the top view, Figure 11 (c) is the right view. Figure 12 The shown is the three-dimensional graph of the top hat type object.

[0075] (2) The top hat type object can be created by parameterization method, two-dimensional or three-dimensional forced conversion method. The parameterization method is used to establish the top hat type object by inputting the size parameters of the top hat structure on the preset interface and establishing the top hat type object on the graphic page. The three-dimensional forced conversion method is used to establish the top hat type object by stretching, fusing, lofting, rotating, arraying, shearing and merging in the graphic system, and then the three-dimensional geometric body of the top hat is forced to be converted into the top hat type object.

[0076] Figure 13 The shown is the three-dimensional graph of the three top hat type objects established by the forced conversion method; among them, Figure 13 (a) is the top hat type object cut by the shears, Figure 13(b) is a top-hat type object with high and low piers, Figure 13 (c) is a top-hat type object with gate-shaped piers. More complex top-hat type objects can be constructed by using the method of forced conversion.

[0077] (3) The attribute information of the top-hat type object includes the name of the top-hat type object, the top-hat concrete grade, etc.

[0078] (4) As shown in Figure 13 , a local Cartesian coordinate and the corresponding base point are marked on the top-hat type object.

[0079] (5) The top-hat type object established by the parametric method can be converted into a top-hat geometric object, and then cut and merged with other solid or hollow geometric bodies to obtain the required top-hat geometric body, and then the top-hat geometric body is forcedly converted into a top-hat type object.

[0080] Seven, the pier body type object involved in the present application is a functional graphic object, and its basic characteristics are as follows:

[0081] (1) The pier body type object is a functional graphic object for representing the pier body part in two-dimensional three-view drawings, and it appears in a comprehensive layout of a bridge to represent the pier body part with consistent structure and size. Figure 14 As shown in Figure 14 , the pier body type object is a two-dimensional graphic representation, and the two-dimensional graphic contains three views: Figure 14 (a) is a front view, Figure 14 (b) is a right view, Figure 15 (c) is a top view.

[0082] (2) The pier body type object can be created by using the parametric method or the three-dimensional forced conversion method. The pier body type object is established by the parametric method, that is, the size parameters of the pier body structure are input on the preset interface, and the pier body type object is established on the graphic page. The pier body type object is established by the three-dimensional forced conversion method, that is, the three-dimensional geometric body of the pier body is first established by stretching, fusing, lofting, rotating, arraying, cutting and merging, etc. in the graphic system, and then the three-dimensional geometric body is forcedly converted into the pier body type object.

[0083] (3) The pier body type object established by the parametric method can be converted into a pier body three-dimensional geometric object, and then cut and merged with other solid or hollow geometric bodies to obtain the required pier body three-dimensional geometric body, and then the three-dimensional geometric body is forcedly converted into the pier body type object.

[0084] (4) As shown in Figure 15 , a local Cartesian coordinate and the corresponding base point are marked on the pier body type object.

[0085] (5) The attribute information of the pier body type object includes the name of the pier body type object and the pier body concrete grade, etc., and the attribute information can be modified on the preset interface thereof.

[0086] Eight, the bridge pier type object involved in the present application is a functional graphic object, and the basic characteristics are as follows:

[0087] (1) The bridge pier includes a pier body, a top cap and a plinth. The bridge pier type object is a functional graphic object for representing the bridge pier part by using two-dimensional three-view drawings. When appearing in a comprehensive layout drawing of a bridge, it indicates that all the structures and sizes of the pier body, the top cap and the plinth of a type of bridge pier are consistent except that the height of the pier body can be different. Figure 16 As shown in the figure, it is a bridge pier type object, and its two-dimensional graphic contains three views, wherein, Figure 16 (a) is a front view, Figure 16 (b) is a right view, Figure 16 (c) is a top view. Figure 17 As shown in the figure, it is a three-dimensional graphic of the bridge pier type object.

[0088] (2) The plinth type object, the pier body type object and the top cap type object can be established first, and then they are selected and assembled to obtain the bridge pier type object.

[0089] (3) The assembly mode of the bridge pier type object has the following two modes:

[0090] Mode 1: Base point alignment mode

[0091] The plinth type object, the top cap type object and the pier body type object can be drawn at any position in the graphic page, and their top views do not overlap. The three type objects are selected from top to bottom in the order of plinth, top cap and pier body, and the base points of the type objects are on a vertical line. In Figure 18 (a) is a plinth type object; Figure 18 (b) is a top cap type object; Figure 18 (c) is a pier body type object; when the three are arranged together according to the design requirements of the plan position, the top views thereof have no overlapping parts, so that the bridge pier type object as shown in Figure 18 (d) can be obtained by assembling operation in the base point alignment mode. Figure 18

[0092] Mode 2: Planar assembly mode

[0093] ​When the contours of the top view of the cushion stone type object, the top hat type object and the pier body type object are arranged together according to the plan position relationship of the design data, if there is an overlapping condition in the top view of the three type objects, the cushion stone type object, the top hat type object and the pier body type object are assembled according to the position relationship of the top view in the order from top to bottom. Figure 19 In Figure 19 (a) are three views of the cushion stone type object and the top hat type object arranged together according to the plan position relationship of the design requirements; Figure 19 (b) are three views of the pier body type object. It can be seen that after the cushion stone type object and the top hat type object are arranged together according to the plan position relationship of the design requirements, there is an overlapping part in the top view, so that the assembly operation can be carried out in the plan assembly mode to obtain the bridge pier type object as shown in Figure 19 (c). Since the top view of the pier body type object and the top hat type object does not overlap, the pier body type object can also participate in the assembly in the base point alignment mode.

[0094] (4) The attribute information of the bridge pier type object includes the name of the bridge pier type object and the height difference of the base point from the track surface. These attribute information can be modified on the preset interface.

[0095] The positions of the corresponding view base points are generally marked on the front view, the right view and the top view of various type objects, and the view base points can be adjusted to the target positions by using the view base point dragging method or the indication line method. Taking the bridge pier type object as an example, the view base point of the bridge pier type object can be dragged or moved to the target position by means of mouse dragging or translation parameter. The end points of the indication line can also be set as the view base points of the bridge pier type object by drawing an indication line on the front view or the top view of the bridge pier type object and setting the end points of the indication line by button operation. In Figure 20 the bridge pier type object shown in Figure 20 (a), the indication line DIR1 marked in Figure 20 (c) is the base point moving adjustment position determined in the top view. The adjusted base point position of the bridge pier type object can be obtained by button operation. After the base point position is adjusted, Figure 21 the 01 point in Figure 21 (a), the 02 point in Figure 21 (c) and the 03 point in (b) mark the new view base points on the three plan views of the bridge pier type object. The three view base points jointly express the base point of the three-dimensional model corresponding to the bridge pier type object.

[0096] Nine, the girder type object involved in the present application is a functional graphic object, and the basic characteristics are as follows:

[0097] (1) The beam type object is a functional graphic object expressed by a front view of a two-dimensional elevation, and is used to represent the main beam part in a bridge general layout diagram. Figure 22 In the beam type object shown in the drawing, a two-dimensional graphic is used as the front view of the beam type object. Figure 23 That is, the three-dimensional graphic of the beam type object.

[0098] (2) The beam type object can be created by a parameterization method or a three-dimensional forced conversion method.

[0099] (3) The specific way of establishing the beam type object by the parameterization method is to input the size parameters of the beam structure in a preset interface, and to establish the beam type object on a graphic page.

[0100] (4) The beam type object established by the parameterization method can first establish the three-dimensional geometry of each segment of the beam, then establish other three-dimensional geometry according to the beam structure diagram, and finally obtain the required three-dimensional geometry of the beam by shearing and merging. It can also directly obtain the required three-dimensional geometry of the beam by stretching, fusing, lofting, shearing and merging, and other general three-dimensional geometry establishment and editing operations.

[0101] (5) The specific way of establishing the beam type object by the three-dimensional forced conversion method is to first establish the three-dimensional geometry of the beam, and then forcibly convert the three-dimensional geometry of the beam into the beam type object.

[0102] (6) The attribute information of the beam type object includes the name of the beam type object and the concrete grade of the beam, etc., which can be modified on the preset interface of the beam type object.

[0103] (7) The beam type object has a local Cartesian coordinate and a corresponding base point, and the base point is automatically set at the upper left point of the beam type object. Figure 22 In the beam type object shown in the drawing, G is the base point of the beam type object. In the three-dimensional graphic of the beam type object shown in the drawing, the upper left point is marked with a local three-dimensional coordinate system and a corresponding base point G. Figure 23

[0104] Ten, the bridge general layout table involved in the present application is a functional graphic object, and the basic characteristics are as follows:

[0105] (1) The bridge general layout table is a two-dimensional table object, has a table name and table content, and is used to represent the layout information of each pier and main beam of the bridge involved in the bridge general layout diagram.

[0106] (2) As shown in the drawing, the bridge general layout table is a two-dimensional table object. Figure 24 ​As shown in the table content of the bridge comprehensive layout table, the table content includes serial number, pier number, pier type, beam joint boundary mileage, line spacing, longitudinal eccentricity, transverse eccentricity, pre-eccentricity, pre-eccentricity direction, left half beam joint, right half beam joint, pier height and pile foundation length and the like.

[0107] The beam joint boundary mileage, left half beam joint, right half beam joint, longitudinal eccentricity, transverse eccentricity and pre-eccentricity and the like are layout information of the bisection method of the simply supported beam on the curve. When the bridge pier is on the straight section, the curve eccentricity and the pre-eccentricity are 0. The longitudinal eccentricity is the deviation of the beam joint boundary mileage and the center mileage of the bridge pier. For the abutment, two mileages, two eccentricities and two line spacings before and after the abutment need to be input, and the English comma is used for separation.

[0108] The pier type refers to the type of the bridge girder supported by the bridge pier, and there are three types of "abutment", "simply supported girder pier" and "continuous girder main pier". If the pier type is the abutment, the bridge girder type is "abutment"; if the right hole span main girder of the pier is a simply supported girder, it is a "simply supported girder pier" type; if it is a continuous girder side pier, the pier type is also a simply supported girder pier; if it is a continuous middle pier, the pier type is a "continuous girder main pier" type.

[0109] (3) In the preset interface of the bridge comprehensive layout table, the required table content can be obtained by inputting or modifying the table content.

[0110] (4) The bridge comprehensive layout table can be established at any position on the graphic page.

[0111] Eleven, the basic type statistical table involved in the application is a functional graphic object, and the basic characteristics are as follows:

[0112] (1) The basic type statistical table is a two-dimensional table object, has a table name and a table content, and is used to represent the name of the basic type object involved in the bridge comprehensive layout drawing and the pier number applicable to it. As shown in the table content of the bridge comprehensive layout table, the table content includes serial number, basic type object name and applicable pier number. Figure 25

[0113] (2) In the preset interface of the basic type statistical table, the required table content can be obtained by inputting or modifying the table content.

[0114] (3) The basic type statistical table can be established at any position on the graphic page.

[0115] Twelve, the pier type statistical table involved in the application is a functional graphic object, and the basic characteristics are as follows:

[0116] ​(1) The pier type statistical table is a two-dimensional table object, which is used to represent the names of the pier type objects involved in the bridge general layout diagram and the pier numbers applicable thereto. As shown in Figure 26 , the pier type statistical table has a table name and table content, and the table content includes a serial number, a pier type object name and a pier number.

[0117] (2) In the preset interface of the pier type statistical table, the required table content can be obtained by inputting or modifying the table content.

[0118] (3) The pier type statistical table can be established at any position on the graphic page.

[0119] Thirteen, the girder type statistical table involved in the present application is a functional graphic object, and its basic characteristics are as follows:

[0120] (1) The girder type statistical table is a two-dimensional table object, which is used to represent the names of the girder type objects involved in the bridge general layout diagram and the pier numbers applicable thereto. As shown in Figure 27 , the girder type statistical table has a table name and table content, and the table content includes a serial number, a girder type object name and an applicable pier number.

[0121] (2) In the preset interface of the girder type statistical table, the required table content can be obtained by inputting or modifying the table content.

[0122] (3) The girder type statistical table can be established at any position on the graphic page.

[0123] Fourteen, the railway bridge three-dimensional BIM assembly object involved in the present application is a functional graphic object, and its basic characteristics are as follows:

[0124] (1) The railway bridge three-dimensional BIM assembly object is a two-dimensional symbol object, which can be represented by a certain two-dimensional graphic object.

[0125] (2) The railway bridge three-dimensional BIM assembly object has attribute information such as an object name, an associated line plane centerline name, a girder top distance track surface height difference, and table names of a bridge general layout table, a foundation type statistical table, a pier type statistical table and a girder type statistical table, and in its preset interface, these attribute information can be modified by setting or querying.

[0126] (3) According to the established line plane centerline, vertical curve, chain table, bridge general layout table name, foundation type statistical table, pier type statistical table, girder type statistical table, foundation type object, pier type object or girder type object, in the preset interface of the railway bridge three-dimensional BIM assembly object, the corresponding railway bridge three-dimensional BIM model can be assembled or queried by button operation.

[0127] (4) On the preset interface of the three-dimensional BIM assembly object of the railway bridge, the bridge plan simulation layout of the piers and beams of the railway bridge to the center line of the line can be created by button operation; the pier elevation layout can also be created; or the pier elevation object, pier cap elevation object, and main beam longitudinal section object of all bridges can be created. These three objects are the basic objects used for temporary structure design.

[0128] The BIM rapid modeling method for railway bridges of the present invention includes the following steps:

[0129] Step 1: Establish the circuit model

[0130] Based on the design data of the broken link list, vertical curves, and the centerline of the railway line at the construction site, the broken link list, vertical curve model, and centerline model are created on the graphics page using parametric methods. These three models are collectively referred to as the railway model. The corresponding broken link list names are set on the operation interface of the vertical curve model, and the corresponding broken link list names and vertical curve names are set on the operation interface of the centerline model.

[0131] Step 2: Create a bridge information table

[0132] In the graphical interface, create a comprehensive bridge layout table, a foundation type statistics table, a pier type statistics table, and a beam type statistics table for the construction project. These four tables are collectively referred to as the bridge information table.

[0133] Step 3: Create objects for each part of the bridge

[0134] Based on the bridge information sheet and construction project design data, establish corresponding foundation type objects, pier type objects, and beam type objects.

[0135] Step 4: Create a 3D BIM model of the railway bridge

[0136] Based on the established basic type objects, pier type objects, and beam type objects, create the following on the graphics page: Figure 28 The diagram shows a 3D assembly object of a bridge represented by a 2D graphic. On its preset interface, the names of the associated track centerline and the height difference between the beam top and the rail surface are first set. Then, the names of the associated bridge layout table, foundation type statistics table, pier type statistics table, and beam type statistics table are set. Finally, the assembly is completed as shown. Figure 29 The image shows a 3D BIM model of a railway bridge.

[0137] Step 5: Using the 3D BIM model of the railway bridge, arrange the piers and beams of the railway bridge in a planar layout as shown. Figure 30 The bridge plan simulation layout is shown on the centerline of the line, and based on this, a bridge is established as follows. Figure 31 The diagram shows the elevation layout of the bridge piers.

Claims

1. A BIM rapid modeling method for railway bridges, characterized by, The method comprises the following steps: S1, establishing a line model: according to the broken chain table, vertical curve and line plane centerline design data of the site where the construction project is located, the broken chain table model, vertical curve model and line plane centerline model are respectively established on the graphic page by using the parameterization method; S2, establishing a bridge information table: the bridge information table including the bridge comprehensive layout table, foundation type statistical table, pier type statistical table and beam type statistical table of the construction project is established on the graphic page; S3, establishing a bridge part type object: according to the bridge information table and construction project design data, the corresponding foundation type object, pier type object and beam type object are established; the foundation type object is a functional graphic object containing the pile cap and pile foundation part expressed by a two-dimensional three-view, and is established by two-dimensional forced conversion method or three-dimensional forced conversion method; the specific way of establishing the foundation type object by the two-dimensional forced conversion method is that, according to the foundation type statistical table and construction project design data, the two-dimensional contour plane graphic of the pile cap and pile foundation of each foundation type object is first drawn in the graphic system, and then the graphic is combined into a block and is forced to be converted into the foundation type object, finally, the attribute information including the pile cap height and pile cap pile foundation concrete grade is set on the preset operation interface of the foundation type object; the specific way of establishing the foundation type object by the three-dimensional forced conversion method is that, according to the foundation type statistical table and construction project design data, the three-dimensional geometric body of the pile cap and pile foundation of each foundation type object is first established in the graphic system by using the three-dimensional geometric modeling method, and then the three-dimensional geometric body is forced to be converted into the foundation type object; S4, establishing a railway bridge three-dimensional BIM model: according to the established foundation type object, pier type object and beam type object, the bridge three-dimensional assembly object is established on the graphic page, and the names of the associated line plane centerline and the distance between the beam top and the track surface height difference are first set on the preset interface, then the names of the associated bridge comprehensive layout table, foundation type statistical table, pier type statistical table and beam type statistical table are set, and finally the railway bridge three-dimensional BIM model is assembled; S5, through the railway bridge three-dimensional BIM model, the pier and beam plane layout of the railway bridge is arranged on the bridge plane simulation lofting drawing of the line plane centerline, and the pier elevation layout drawing is established according to the arrangement.

2. The BIM rapid modeling method of railway bridges according to claim 1, characterized in that, On the operation interface of the vertical curve model established in step S1, the corresponding broken chain table name is set; On the operation interface of the line plane centerline model, the corresponding broken chain table name and vertical curve name are set.

3. The BIM rapid modeling method of railway bridges according to claim 1, characterized in that, The beam type object is a functional graphic object of the main beam part expressed by a two-dimensional elevation front view, and is established by the parameterization method or the three-dimensional forced conversion method.

4. The BIM rapid modeling method of railway bridges according to claim 3, characterized in that, The specific way of establishing the beam type object by the parameterization method is that the size parameters of the beam structure are input on the preset interface, and the beam type object is established on the graphic page.

5. The BIM rapid modeling method of railway bridges according to claim 3, characterized in that, The specific way of establishing the beam type object by the three-dimensional forced conversion method is that the three-dimensional geometric body of the beam is first established, and then the three-dimensional geometric body of the beam is forced to be converted into the beam type object.

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