CN108595891B - Two-dimensional BIM design method for temporary support structure for concrete bridge girder construction - Google Patents
Two-dimensional BIM design method for temporary support structure for concrete bridge girder construction Download PDFInfo
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Abstract
The invention relates to a two-dimensional BIM design method of a temporary support structure for concrete bridge girder construction, which comprises the following steps: establishing a concrete bridge girder information model; establishing a load combination parameter model required by calculation of a concrete bridge main beam support structure; building structural template objects of structural parts in temporary supports, such as longitudinal beams, triangular brackets, large cross beams, transverse distribution beams, wedge-shaped trusses, transverse connections, square timbers, templates and the like in the temporary supports; establishing an assembly information model of each structural template; establishing a family of parts such as embedded parts, node connections, foundations, sandboxes and the like of the temporary support structure by Revit software, and storing the family in a corresponding family file; establishing connection information of the structure template and the family file; and comprehensively analyzing all information in the previous steps, automatically generating a Revit three-dimensional BIM model of the temporary support structure and a three-dimensional Midas command stream by using software, and calculating a calculation result required by query in Midas software. The invention realizes the simplification and high efficiency of the BIM design of the temporary support structure for the construction of the main beam of the concrete bridge.
Description
Technical Field
The invention relates to a construction method of a concrete bridge main beam bridge support, in particular to a two-dimensional BIM design method of a concrete bridge main beam construction temporary support structure.
Background
The BIM (building Information modeling) technology 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 in a computer modeling mode, 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 building 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.
The support method is a common method adopted by a cast-in-place construction method of a main beam of a concrete bridge, wherein a beam column type support and a triangular bracket are common temporary support structure forms. The temporary support structure scheme which is economical, reasonable, safe and reliable can be obtained from a plurality of possible construction schemes according to field technical conditions, is the basis that the construction safety, progress and cost of the concrete bridge girder can be effectively controlled, and is an important embodiment of project construction technical level. At present, the structural design of a concrete bridge girder construction support is mainly to express a design scheme through AutoCAD drawing and utilize related mechanics calculation software to evaluate the bearing capacity. This design usually requires multiple iterations to achieve satisfactory results. In the design of the scheme, due to the uncoordinated mechanical calculation information, the three-view and local detail information and the like, the time and labor are wasted for obtaining a reasonably optimized design scheme, and the standardization and automation degree is low.
Disclosure of Invention
The invention aims to provide a two-dimensional BIM design method of a temporary support structure for the construction of a concrete bridge girder, which realizes the simplification, standardization and high efficiency of the structural design of the temporary support structure for the construction of the concrete bridge girder.
The invention is realized by the following steps: a two-dimensional BIM design method for a temporary support structure for concrete bridge girder construction comprises the following steps:
a. establishing a concrete bridge girder information model to be poured, which is expressed by a two-dimensional functional graphic object, by using interactive drawing software, wherein the concrete bridge girder information model comprises a girder longitudinal section object, a girder cross section object and a girder web plate plane object of the concrete bridge to be poured;
b. establishing a load combination parameter model which is required by the calculation of the temporary support structure for the construction of the main beam of the concrete bridge and accords with the specification of the bridge construction technical specification by using interactive drawing software, wherein the load combination parameter model is described by using a two-dimensional functional graphic object or other parameter forms;
c. respectively creating structural templates and associated connecting lines of all components of a temporary concrete bridge girder construction support, including longitudinal beams, triangular brackets, large cross beams, transverse distribution beams, wedge-shaped trusses, transverse links, small longitudinal beams, square timbers and templates, by using interactive drawing software, wherein the created structural templates and the associated connecting lines are two-dimensional functional graphic objects;
d. establishing a plurality of datum planes by using interactive drawing software, establishing associated structural template characteristic lines in an area surrounded by the outline of each datum plane, describing an assembly information model of each structural template in the temporary concrete bridge girder construction support by using the plurality of datum planes and the associated structural template characteristic lines in the area, wherein the structural template characteristic lines and the datum planes are two-dimensional functional graphic objects;
e. establishing a three-dimensional model of a local structure in a temporary support structure including an embedded part, a flange, a node connection, a foundation and a sandbox under a local coordinate system by using interactive drawing software or third-party BIM software, wherein the three-dimensional model established by using the third-party BIM software needs to be stored by using a corresponding three-dimensional model file;
f. in interactive drawing software, establishing connection information of a structural template and a three-dimensional model of a local structure by constructing the connection line attribute of a rod piece on the structural template and the local structure in a temporary support structure;
g. generating a three-dimensional BIM model of the temporary support structure for the construction of the main beam of the concrete bridge by using interactive drawing software according to various information models obtained in the steps a to f, and automatically creating a structural mechanics calculation model; or the three-dimensional BIM model of the concrete bridge girder construction temporary support structure is established on the third-party BIM software by constructing the comprehensive three-dimensional model data of the concrete bridge girder construction temporary support suitable for certain third-party BIM software and then utilizing the data interface technology or the plug-in technology of the third-party BIM software.
The main beam longitudinal section object is established in the following mode: and (3) drawing partial or all two-dimensional geometric figures in the longitudinal section of the main beam by using interactive drawing software, combining the two-dimensional geometric figures into a whole figure to form a two-dimensional geometric figure object of the longitudinal section of the main beam, and converting the two-dimensional geometric figure object into a two-dimensional functional figure object by using the interactive drawing software, namely the main beam longitudinal section object.
The main beam cross section object is established in the following mode: drawing a two-dimensional geometric figure of a cross section at a certain position on the main beam, combining the two-dimensional geometric figures into a figure whole to form a two-dimensional geometric figure object of the cross section of the main beam, and converting the two-dimensional geometric figure object into a two-dimensional functional figure object through interactive drawing software, namely the cross section object of the main beam.
The method for establishing the plane object of the web plate of the main beam is as follows: and (3) using interactive drawing software to draw a two-dimensional geometric figure of the main beam web plate reflecting the thickness change of the main beam web plate, combining the two-dimensional geometric figure into a whole figure to form a two-dimensional geometric figure object of the main beam web plate plane, and converting the two-dimensional geometric figure object into a two-dimensional functional figure object through the interactive drawing software, namely the main beam web plate plane object.
The main three-dimensional structural size of the concrete bridge girder is described by the girder longitudinal section object, the girder cross section object and the girder web plane object.
The structure template created in the step c is a two-dimensional functional graphic object, and comprises various attribute information including structure shape, rod length, section type, section specification, section direction, rod material, structure plane direction and reference point position for positioning the structure template; the structural template has a surface attribute to describe whether the structural template is arranged horizontally, vertically, or at an angle of inclination to the horizontal.
Step d is described by creating one or more datum objects and their associated structural template feature lines. The structural template characteristic line is in the range of the profile of the reference surface or is intersected with the profile of the reference surface, namely, the structural template characteristic line and the reference surface are considered to have a relationship, and the structural template characteristic line has the surface attribute of the reference surface associated with the structural template characteristic line.
The reference surface is a two-dimensional functional graphic object with surface attribute information, is used for describing a certain horizontal plane type and is called as a horizontal reference surface, or is used for describing a transverse vertical surface type which is vertical to the longitudinal section of the main beam and is called as a transverse vertical reference surface, or is used for describing a vertical surface type which is vertical to the cross section of the main beam and is called as a vertical surface reference surface, or is used for describing an inclined surface which is obliquely intersected with a certain type of reference surfaces of the three reference surfaces and is called as an inclined reference surface; each datum plane is provided with a datum point, the datum point has plane coordinates and elevation attributes relative to a certain appointed point on a main beam of the concrete bridge to be poured, the appointed point on the main beam is called as a main beam original point and is also an original point of a space coordinate system included by the design of the temporary support; the datum plane can be drawn at any position of a graph window in the interactive graph system, and the relative spatial position relation between the datum plane and the main beam of the concrete bridge to be poured can be determined through the elevation and the plane coordinate attribute of the datum point of the datum plane.
The structure template characteristic line is a two-dimensional functional graphic object, has the attributes including a datum point, a characteristic line direction and an elevation difference between a datum line and a datum plane, and can be drawn on the datum plane associated with the structure template characteristic line by an interactive graphic system; describing the relative position relation between the structure template characteristic line and the related reference surface through the reference point of the structure template characteristic line and the characteristic line direction attribute; the structure template characteristic line also has a structure template attribute, and the incidence relation between the structure template characteristic line and the structure template is described through the structure template attribute; and describing the spatial position relationship of the structural template relative to the concrete bridge main beam by inputting the engineering attributes of the structural template, the structural template characteristic line associated with the structural template and the reference surface.
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 BIM design process of the concrete bridge girder construction temporary support structure is changed into a process of simply operating a two-dimensional functional graphic object, the problems of design and calculation of the concrete bridge girder construction temporary support structure can be effectively solved, and therefore simplification and high efficiency of the BIM design process of the concrete bridge girder construction temporary support structure are achieved.
Drawings
Fig. 1 is a structural view of a beam-column type temporary support of a concrete bridge girder.
Fig. 2 is a schematic elevation structure of a conventional tripod.
FIG. 3 is a schematic view of the construction of the flask-type cam carrier in an elevated position.
Fig. 4 is a plan view of a longitudinal section of the main beam.
Fig. 5 is a plan view of a cross section of the main beam.
FIG. 6 is a plan view of a spar web.
Fig. 7 is a schematic view of a structural template of the triangular bracket.
FIG. 8 is a schematic view of a datum plane and a feature line of a structural template.
FIG. 9 is a family illustration of embedments for the temporary support structure.
Figure 10 is an illustration of a family of nodal connections of a rod cradle.
FIG. 11 is a family illustration of a steel pipe column foundation embedment.
Fig. 12 to 14 are three-dimensional BIM design examples of the triangular bracket of the main girder of the concrete bridge.
In the figure: 1. the concrete bridge comprises a foundation, 2, steel pipe columns, 3, sand boxes, 4, large cross beams, 5, longitudinal beams, 6, transverse distribution beams, 7, square timbers, formworks, 8, flanges, 9, connecting rods, 10, embedded parts, 11, transverse connections, 12, wedge-shaped trusses, 13, triangular brackets, 14, cushion beams, 15, small longitudinal beams, 16, piers, 17 and concrete bridge main beams.
Detailed Description
The concrete bridge girder construction temporary support structure related to the two-dimensional BIM design method comprises temporary support structure types such as a beam column type support (figure 1) and a triangular bracket (figures 2 and 3).
In fig. 1, a concrete bridge girder 17 is arranged on a left pier and a right pier 16, and a temporary support structure for concrete bridge girder construction is formed by a foundation 1, steel tube columns 2, sand boxes 3, large cross beams 4, longitudinal beams 5, transverse distribution beams 6, square timbers, templates 7, flanges 8, connecting rods 9 and the like. In fig. 2, a concrete bridge main beam 17 is arranged on a pier 16, and a temporary support structure of the concrete bridge main beam is formed by a triangular bracket 13, a transverse distribution beam 6, a wedge-shaped truss 12, a square timber and formwork 7, an embedded part 10, a transverse connection 11 and the like. In fig. 3, a concrete bridge main beam 17 is arranged on a pier 16, and a temporary support structure of the concrete bridge main beam is formed by a triangular bracket 13, a sand box 3, a pad beam 14, a small transverse distribution beam 6, a small longitudinal beam 15, a square timber, a template 7, an embedded part 10 and the like.
The invention discloses a two-dimensional BIM design method of a temporary support structure for concrete bridge girder construction, which comprises the following steps:
step one, establishing a concrete bridge girder information model, which comprises a girder longitudinal section object, a girder cross section object and a girder web plane object, wherein the girder is a concrete bridge girder 17 shown in fig. 1-3.
The main beam longitudinal section object is established in the following mode: and (3) drawing partial or all two-dimensional geometric figures (figure 4) in the longitudinal section of the main beam by using interactive drawing software, combining the two-dimensional geometric figures into a whole figure to form a two-dimensional geometric figure object of the longitudinal section of the main beam, and converting the two-dimensional geometric figure object into a two-dimensional functional figure object by using the interactive drawing software, namely the main beam longitudinal section object.
The main beam cross section object is established in the following way: drawing a two-dimensional geometric figure (figure 5) of the cross section of a certain position on the main beam, 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 converting the two-dimensional geometric figure object into a two-dimensional functional figure object through interactive drawing software, namely the cross section object of the main beam.
The method for establishing the plane object of the web plate of the main beam comprises the following steps: and (3) using interactive drawing software to draw a two-dimensional geometric figure (figure 6) of the main beam web plate reflecting the thickness change of the main beam web plate, combining the two-dimensional geometric figure and the two-dimensional geometric figure into a whole figure to form a two-dimensional geometric figure object of the main beam web plate plane, and converting the two-dimensional geometric figure object into a two-dimensional functional figure object through the interactive drawing software, namely the main beam web plate plane object.
The main three-dimensional structural size of the concrete bridge girder is described by the girder longitudinal section object, the girder cross section object and the girder web plane object.
And step two, establishing a load combination parameter model required by the design and calculation of the concrete bridge girder construction temporary support structure in the interactive drawing software.
The design of the temporary support structure needs to consider two types of constant load and live load according to the relevant bridge construction technical specification, and the two types are obtained by combined calculation according to a certain combination coefficient. The self-weight of the concrete of the support, the template and the beam body belongs to constant load, and the load of machines and tools of people, the vibration and impact load of the concrete, other wind and snow loads and the like belong to live load. The crowd machine loads comprise various loads of walking, transporting and stacking of constructors, construction materials, machines and the like. The values of all loads and the selection of combination coefficients all need to follow the relevant bridge construction technical specifications. When the strength is checked, the constant load polynomial coefficient is 1.2, and the live load polynomial coefficient is 1.4; and during rigidity calculation, the constant load and the live load have the polynomial coefficient of 1. Besides the concrete qualification load, the information of the constant load and the live load and the corresponding combined information can be expressed by creating a load parameter table (see table 1).
Step three, decomposing the temporary support structure into longitudinal beams, triangular brackets, large cross beams, transverse distribution beams, wedge-shaped trusses, transverse connections, small longitudinal beams, square timbers, templates and other components, and respectively creating structural templates of the components in the temporary support structure in interactive drawing software, wherein the specific creation steps are as follows:
3-1, respectively drawing the two-dimensional geometric figures of all the structure templates of the components in interactive drawing software, combining the two-dimensional geometric figures into a two-dimensional figure whole, and converting the two-dimensional geometric figures into two-dimensional functional figure objects, namely the structure templates of the components. The structure template may be drawn anywhere in the interactive graphics system.
The structural template is a functional graphic object (figure 7) expressed by a rod member shape line, and comprises various attribute information including a structural shape, a rod member length, a section type, a section specification, a section direction, a rod member material, a structural plane direction and a datum point position, and can be provided with a rod member reinforcing plate, a section rib plate, a rod member shearing and embedded part connecting information. The reference points of the structural template are positioning points for assembling the structural template.
3-2 inputting the engineering attributes of the selected rod pieces in each structural template, and mainly comprising the following steps: the structural template comprises a structural template name, the section type of each rod piece, section specifications, section directions, rod piece materials, structural plane directions, datum point positions for positioning the structural template, surface relation attributes of the structural template relative to an associated datum plane and the like.
The plane relation attribute is information that a two-dimensional structure template of the structure template is in a reference plane, orthogonal to the reference plane, or oblique to the reference plane. When diagonal to the reference plane, a skew angle needs to be input.
The reference plane is a working plane having plane attribute information to express its different reference plane types. The plane property of the reference plane can be used to describe a certain horizontal plane type (called a "horizontal reference plane"), or to describe a transverse vertical plane type (called a "transverse vertical reference plane") perpendicular to the longitudinal plane of the main beam, or to describe an elevation vertical plane type (called an "elevation reference plane") perpendicular to the longitudinal plane of the main beam, or to describe an inclined plane (called an "inclined reference plane") oblique to a certain reference plane of the three reference planes. Each datum level has a datum point having planar coordinates and elevation properties relative to a designated point on the concrete bridge girder, referred to as the origin of the girder, which is also the origin of the spatial coordinate system encompassed by the temporary support structure design.
Drawing a straight line segment at a certain position of a rod piece in the structure template, orthogonal or oblique crossing the straight line segment and the rod piece, converting the straight line segment into a connecting line object, opening a dialog box of the connecting line object, inputting a processing mode of the structure template at the position of the connecting line, mainly comprising names or file names of local-structure three-dimensional models of an associated embedded part, node connection, node reinforcement, foundation and sandbox, establishing connection information of the structure template and the local-structure three-dimensional models, or realizing trimming and the like of the rod piece at the position.
The method comprises the following steps of establishing an assembly information model of a structure template corresponding to each component structure part in a temporary support structure adopted by concrete bridge construction in interactive drawing software, and specifically comprises the following steps:
4-1 collectively describe the assembly information model of the structure template by drawing one or more reference surface objects in the interactive drawing software and drawing structure template feature lines on each reference surface.
4-2 creation of reference plane: firstly, drawing a rectangular object, then converting the rectangular object into a reference surface object, setting the position of a reference point, and inputting the surface attribute of the reference surface, the elevation and the plane coordinate of the reference point relative to the origin of the main beam. The reference surface may be drawn at any position of a graphical window in the interactive graphical system.
4-3 creation of structural template feature lines: and drawing a straight line in the outline range of each datum plane, converting the straight line into a structural template characteristic line, and inputting or modifying the attributes of the datum point position, the structural template name, the height difference between the datum line and the datum plane and the like of the structural template characteristic line. The structure template characteristic line can be intersected with the reference surface or in the outline range of the reference surface, so that an association relation is established between the structure template characteristic line and the reference surface, and the structure template characteristic line has surface attribute information of the associated reference surface. The structure template feature line is a two-dimensional functional graphic object and has attributes such as a reference point, a feature line direction, a structure template name and the like. The direction of the structure template object related to the structure template object on the reference surface is controlled through the direction of the structure template characteristic line, and the specific position of the structure template in the direction of the structure characteristic line is required to be controlled according to the principle that the structure template reference point is coincident with the structure template characteristic line reference point.
And 4-4, describing the relative spatial position relationship of the temporary structure component corresponding to the structural template relative to the concrete bridge girder through the reference surface, the structural template characteristic line, the structural template and the incidence relationship among the structural templates.
In the schematic diagram of the structural formwork of the triangular bracket in fig. 7, reference numeral 25 is a structural formwork corresponding to the triangular bracket structure, reference numeral 21 is a reference point, reference numeral 22 is an embedded part connecting line, reference numeral 23 is a connecting line for shearing the rods between the structural formworks, and reference numeral 24 is a connecting line for arranging the rib plates on the rods in the structural formworks.
Step five, creating an assembly information model of a structure template corresponding to each component structure part in a temporary support structure adopted by concrete bridge construction in interactive drawing software, wherein the assembly information model is called as the assembly information model of the temporary support structure, and the concrete steps are as follows:
5-1 respectively drawing a rectangular object in the interactive graphic software, converting the rectangular object into a reference surface object, setting the position of a reference point in an attribute dialog box of the rectangular object, inputting the surface attribute of the reference surface, the attributes of the reference point relative to the origin of the main beam, such as the elevation and the plane coordinate, and the like.
5-2, drawing a straight line in the profile range of the reference surface, converting the straight line into a structural template characteristic line, and inputting or modifying the attributes such as the reference point position of the structural template characteristic line, the height difference between the reference line and the reference surface, the associated structural template name and the like on a dialog box of the straight line; a plurality of structural template feature lines may be disposed on one of the datum surfaces.
In the schematic diagram of the reference plane and the feature line of the structure template in fig. 8, reference numeral 35 denotes the reference plane, reference numeral 34 denotes the reference point of the reference plane, reference numerals 31 and 32 denote the feature lines of the structure template, and reference numeral 33 denotes the reference point of the feature line of the structure template.
5-3 repeat steps 5-1 and 5-2 to create additional datum planes and their associated structural template feature lines.
And step six, establishing a partially constructed Revit family including embedded parts, node connection, node reinforcement, a foundation and a sandbox in a temporary support structure adopted by the construction of the concrete bridge girder by utilizing the family technology of Revit software, and storing the family in a form of family files.
And step seven, according to all the information models obtained in the step seven, three-dimensional BIM model data of the concrete beam bridge temporary support structure are automatically generated by using interactive drawing software, a structural mechanics calculation model is automatically created, and then a corresponding three-dimensional BIM model of the concrete beam bridge temporary support is automatically created on Revit software by using Revit plug-in technology. The specific implementation steps are as follows:
7-1, calculating the longitudinal line load and the transverse line load of any cross section of the girder by using the girder information model and the load combination parameter model established in the first step and the second step, and considering the load combination specification requirement of the related bridge construction technical specification during load calculation.
7-2, obtaining the structural templates of all the components of the temporary support structure for the construction of the main beam of the concrete bridge by using the step three, analyzing the model information of the structural templates, and constructing the three-dimensional BIM model corresponding to the structural templates.
7-3, obtaining a three-dimensional BIM model after each structural template is trimmed by using the trimming method according to the processing mode information of the connecting lines of each structural template established in the fourth step on the associated rod pieces, and assembling the partially constructed Revit family and the associated structural templates thereof by using the partially constructed Revit family information of the embedded parts, the node connections, the node reinforcements, the flanges, the foundations, the sandboxes and the like established in the fifth step through translation, rotation and other methods to obtain the three-dimensional BIM model after each structural template is trimmed and assembled.
7-4, constructing a three-dimensional BIM model formed by trimming and assembling each structural template obtained in the step 7-3 by using the temporary support structure assembly information model formed by the datum plane and the structural template characteristic line constructed in the step five, constructing a coordinate system on a specified main beam origin in a unified manner according to the structural template characteristic line and the datum plane related to the three-dimensional BIM model, and assembling the three-dimensional BIM model by adopting translation, rotation and other methods to form the three-dimensional BIM model of the temporary support structure for the concrete bridge main beam construction, wherein the three-dimensional BIM model can be created, displayed and inquired through a plug-in technology of Revit software.
7-5, forming a three-dimensional BIM model of the temporary support structure for the construction of the main beam of the concrete bridge in the step 7-4, converting each structural template into a rod member finite element model, and determining node constraint conditions of the rod member finite element model by analyzing embedded parts associated with the structural templates; the unit segmentation needs to consider the given maximum unit length limit value and consider the connection relation between finite element nodes of the rod corresponding to each structural template, and the rod unit number and the node code can be automatically generated according to the assembly sequence of the structural templates. And (3) calculating the load borne by a unit directly contacted with the concrete bridge girder by using the girder information model constructed in the first step and the combined load parameter model constructed in the second step, further constructing a three-dimensional rod finite element model of the temporary support structure, automatically generating an MCT (computer control technology) command stream of the Midas software, and calculating and inquiring a three-dimensional mechanical calculation result of the temporary support structure in the Midas software.
Claims (7)
1. A two-dimensional BIM design method of a temporary support structure for concrete bridge girder construction is characterized by comprising the following steps:
a. establishing a concrete bridge girder information model to be poured, which is expressed by a two-dimensional functional graphic object, by using interactive drawing software, wherein the concrete bridge girder information model comprises a girder longitudinal section object, a girder cross section object and a girder web plate plane object of the concrete bridge to be poured;
b. establishing a load combination parameter model required by calculation of a temporary support structure for construction of a main beam of a concrete bridge by using interactive drawing software, wherein the load combination parameter model is described by using a two-dimensional functional graphic object or other parameter forms;
c. respectively creating structural templates and associated connecting lines of all components of a temporary concrete bridge girder construction support, including longitudinal beams, triangular brackets, large cross beams, transverse distribution beams, wedge-shaped trusses, transverse links, small longitudinal beams, square timbers and templates, by using interactive drawing software, wherein the created structural templates and the associated connecting lines are two-dimensional functional graphic objects;
d. establishing a plurality of datum planes by using interactive drawing software, establishing associated structural template characteristic lines in an area surrounded by the outline of each datum plane, describing an assembly information model of each structural template in the temporary concrete bridge girder construction support by using the plurality of datum planes and the associated structural template characteristic lines in the area, wherein the structural template characteristic lines and the datum planes are two-dimensional functional graphic objects;
e. establishing a three-dimensional model of a local structure in a temporary support structure including embedded parts, flanges, node connection, a foundation and a sandbox in a local coordinate system by using interactive drawing software or third-party BIM software;
f. in interactive drawing software, establishing connection information of a structural template and a three-dimensional model of a local structure by constructing the connection line attribute of a rod piece on the structural template and the local structure in a temporary support structure;
g. generating a three-dimensional BIM model of the temporary support structure for the construction of the main beam of the concrete bridge by using interactive drawing software according to various information models obtained in the steps a to f, and automatically creating a structural mechanics calculation model; or the three-dimensional BIM model of the concrete bridge girder construction temporary support structure is established on the third-party BIM software by constructing the comprehensive three-dimensional model data of the concrete bridge girder construction temporary support suitable for certain third-party BIM software and then utilizing the data interface technology or the plug-in technology of the third-party BIM software;
the two-dimensional functional graphic object in step a is a two-dimensional graphic object in an interactive graphic system having the following basic features:
a1, having interactive geometric operation function substantially the same as that of the traditional two-dimensional geometric figure object, namely, being capable of interacting with the user in a graphical interactive mode;
a2, having diversified display states, but each type of functional graphic object has the same engineering attribute information and professional functions; the functional graphic object has an independent attribute dialog box as an operation interface, a user opens the attribute dialog box through a mouse click or double click event, engineering information concerned by the user and a professional function button command related to the graphic object are displayed on the attribute dialog box, and a professional function related to the functional graphic object can be realized by operating the professional function button command;
a3, the method for creating the functional graphic object comprises the following three steps:
(1) creating a parameterization;
(2) automatically creating through other functional image objects;
(3) establishing 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.
2. The two-dimensional BIM design method of the temporary support structure for the construction of the main beam of the concrete bridge as claimed in claim 1, wherein the main beam longitudinal section object is established in a mode that: and (3) drawing partial or all two-dimensional geometric figures in the longitudinal section of the main beam by using interactive drawing software, combining the two-dimensional geometric figures into a whole figure to form a two-dimensional geometric figure object of the longitudinal section of the main beam, and converting the two-dimensional geometric figure object into a two-dimensional functional figure object by using the interactive drawing software, namely the main beam longitudinal section object.
3. The two-dimensional BIM design method of the temporary support structure for the construction of the main beam of the concrete bridge as claimed in claim 1, wherein the main beam cross section object is established in a mode that: drawing a two-dimensional geometric figure of a cross section at a certain position on the main beam, combining the two-dimensional geometric figures into a figure whole to form a two-dimensional geometric figure object of the cross section of the main beam, and converting the two-dimensional geometric figure object into a two-dimensional functional figure object through interactive drawing software, namely the cross section object of the main beam.
4. The two-dimensional BIM design method of the temporary support structure for the construction of the concrete bridge girder according to claim 1, wherein the plane object of the girder web plate is established in a manner that: and (3) using interactive drawing software to draw a two-dimensional geometric figure of the main beam web plate reflecting the thickness change of the main beam web plate, combining the two-dimensional geometric figure into a whole figure to form a two-dimensional geometric figure object of the main beam web plate plane, and converting the two-dimensional geometric figure object into a two-dimensional functional figure object through the interactive drawing software, namely the main beam web plate plane object.
5. The method of claim 1, wherein the structural form created in step c is a two-dimensional functional graphic object including various attribute information including a structural shape, a length of the bar, a section type of each bar, a section specification, a section direction, a bar material, a structural plane direction, and a reference point position for positioning the structural form.
6. The method of claim 1, wherein step d is described by creating one or more datum plane objects and their associated structural template feature lines.
7. The two-dimensional BIM design method of the temporary support structure for the construction of the main beam of the concrete bridge as claimed in claim 6, wherein in the step e, for the local structural parts including the embedded parts, the node connections of the rod supports, the embedded parts of the foundation of the steel tube columns and the sandboxes included in the temporary support structure for the construction of the main beam of the concrete bridge, a corresponding three-dimensional model needs to be built, or a third-party BIM software is used for building the three-dimensional model and the three-dimensional model is stored in a corresponding three-dimensional model file form.
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