A three-dimensional modeling method for cast-in-place box beam and computer-readable storage medium

Abstract

The present invention discloses a method for three-dimensional modeling of a cast-in-place box girder, the method comprising: obtaining a target road three-dimensional model, and determining two road side lines, a plurality of box girder main body lofting positions, and a plurality of pier position lines in the target road three-dimensional model; constructing a box girder main body cross section at each box girder main body lofting position according to the two road side lines; lofting all constructed box girder main body cross sections to construct a box girder main body three-dimensional model; constructing a box chamber three-dimensional model and a cross beam three-dimensional model at each pier position line based on the box girder main body three-dimensional model; after deducting the box chamber three-dimensional model from the box girder main body three-dimensional model, merging the three-dimensional models of all constructed cross beams with each constructed cross beam three-dimensional model to generate a cast-in-place box girder three-dimensional model. The present invention also discloses a computer-readable storage medium.

Description

Technical Field

[0001] The present invention relates to the technical field of computer-aided design, and in particular to a three-dimensional modeling method for a cast-in-place box girder and a computer-readable storage medium. Background Art

[0002] Box girder is a kind of prestressed reinforced concrete beam in bridge engineering, which is divided into prefabricated box girder and cast-in-place box girder. Cast-in-place box girder is mostly used for large continuous bridges and needs to be cast on site during construction.

[0003] At present, there are few BIM design software for bridge modeling in the municipal field. When constructing a cast-in-place box girder model, the bridge modeling software on the market generally first simply parametrically designs the section, and then obtains the final cast-in-place box girder model through stretching or lofting. This simple design cast-in-place box girder modeling method in the prior art is only applicable to roads with little change in road width, such as highway bridges, and is not applicable to roads with frequent changes in road width, such as urban roads.

[0004] There is currently no effective solution to the technical problem that the existing cast-in-place box girder modeling method is not universal. Summary of the invention

[0005] The purpose of the present invention is to provide a three-dimensional modeling method for a cast-in-place box girder and a computer-readable storage medium, which can solve the technical problem that the modeling method for a cast-in-place box girder in the prior art is not universal.

[0006] One aspect of the present invention provides a method for three-dimensional modeling of a cast-in-place box girder, the method comprising: obtaining a target road three-dimensional model, and determining two pavement side lines, multiple box girder main body layout positions and multiple pier position lines in the target road three-dimensional model; constructing a box girder main body cross-section at each box girder main body layout position according to the two pavement side lines; staking out all constructed box girder main body cross-sections to construct a box girder main body three-dimensional model; constructing a box chamber three-dimensional model and a crossbeam three-dimensional model at each pier position line based on the box girder main body three-dimensional model; and merging the box chamber three-dimensional model from the box girder main body three-dimensional model with the constructed three-dimensional models of all crossbeams to generate a cast-in-place box girder three-dimensional model.

[0007] Optionally, constructing the box girder main body cross-section at each box girder main body lofting position according to the two pavement side lines includes: identifying the road three-dimensional sub-model required for generating the three-dimensional model of each span of the cast-in-place box girder in the target road three-dimensional model; wherein each road three-dimensional sub-model includes two pier position lines; determining the layout direction of the box girder main body cross-section at each box girder main body lofting position in the road three-dimensional sub-model according to the positional relationship between the two pier position lines in the road three-dimensional sub-model; and constructing the box girder main body cross-section at each box girder main body lofting position in the road three-dimensional sub-model according to the two pavement side lines and the layout direction.

[0008] Optionally, determining the layout direction of the box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model according to the positional relationship between the two pier position lines in the road three-dimensional sub-model includes: determining the positional relationship between the two pier position lines in the road three-dimensional sub-model; when the positional relationship is a parallel relationship, determining the layout direction of the box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model to be parallel to the two pier position lines; when the positional relationship is a non-parallel relationship, adding a box girder main body lofting position in the road three-dimensional sub-model, and determining the layout direction of the box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model to be perpendicular to the center line of the road in the road three-dimensional sub-model.

[0009] Optionally, adding a box girder main body layout position in the road three-dimensional sub-model includes: identifying an oblique pier position line from two pier position lines of the road three-dimensional sub-model; determining a box girder main body layout position adjacent to the oblique pier position line in the road three-dimensional sub-model; and adding a box girder main body layout position between the oblique pier position line and the box girder main body layout position adjacent to the oblique pier position line.

[0010] Optionally, constructing the box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model according to the two road surface side lines and the layout direction includes: moving the two road surface side lines vertically downward by the road thickness of the road three-dimensional model to obtain two flange plate top surface side lines; obtaining a preset flange plate outer edge thickness and flange plate width, and determining the box girder thickness corresponding to the flange plate width; performing N vector offsets on each flange plate top surface side line according to the flange plate outer edge thickness, the flange plate width and the box girder thickness corresponding to the flange plate width to obtain characteristic lines at N preset positions in the flange plate bottom surface adjacent to each flange plate top surface side line; obtaining the pier position line closest to the box girder main body lofting position, intersecting the pier position line with the two flange plate top surface side lines and the characteristic lines at all preset positions, and connecting all intersections into a closed area as the box girder main body cross section at the box girder main body lofting position.

[0011] Optionally, the determining of the box girder thickness corresponding to the flange plate width comprises: when the main body lofting position of the box girder is located within a preset range of equal-height box girder, obtaining the box girder thickness associated with the range of equal-height box girder as the box girder thickness corresponding to the flange plate width; when the main body lofting position of the box girder is located within a preset range of variable-height box girder, obtaining the box girder thickness corresponding to the flange plate width according to formula (1); wherein the formula (1) is: y=x 2 (d h -k h ) / p h 2 ; y is the thickness of the box beam, x is [0, p h ] any value in the range, d h is the height of the pier top beam, k h is the mid-span beam height, p h is the length of the variable height box girder range.

[0012] Optionally, a three-dimensional model of a box chamber is constructed based on the three-dimensional model of the box girder body, including: determining a plurality of box chamber layout positions in the target road three-dimensional model; wherein the plurality of box chamber layout positions include positions of a plurality of broken line pier position lines; identifying the box girder body cross section at each box chamber layout position from the three-dimensional model of the box girder body; obtaining preset box chamber relative parameters at each box chamber layout position, and constructing a box chamber cross section at each box chamber layout position based on the preset box chamber relative parameters at each box chamber layout position and the box girder body cross section; wherein the preset box chamber relative parameters are used to characterize the relative size relationship between the box girder body cross section and the box chamber cross section; determining the number of first line segments of each broken line pier position line, and staking out all constructed box chamber cross sections based on the number of each first line segment to construct a three-dimensional model of the box chamber.

[0013] Optionally, all the constructed chamber cross sections are laid out according to the number of each first line segment to construct a chamber three-dimensional model, including: dividing the first chamber cross section at the broken line pier position line into a plurality of plane sub-areas equal to the number of the first line segments according to the turning position of the broken line pier position line; dividing the second chamber cross section closest to the first chamber cross section into a plurality of plane sub-areas equal to the number of the first line segments according to the turning position of the broken line pier position line; dividing the plane sub-areas associated with the same line segment of the broken line pier position line in the first chamber cross section and the second chamber cross section into a group; laying out each group of plane sub-areas to obtain spatial areas equal to the number of the first line segments; and constructing the chamber three-dimensional model according to the spatial areas equal to the number of the first line segments and the remaining chamber cross sections.

[0014] Optionally, a three-dimensional model of the beam at each pier position line is constructed based on the three-dimensional model of the box girder body, including: determining a number of beam layout positions according to each pier position line in the target road three-dimensional model; identifying the box girder body cross-section at each beam layout position from the three-dimensional model of the box girder body; constructing a longitudinal section of the beam at each beam layout position according to the pier position lines associated with each beam layout position and the box girder body cross-section at each beam layout position; and staking out the longitudinal section of the beam associated with each pier position line to construct a three-dimensional model of the beam at each pier position line.

[0015] Optionally, the method of constructing the longitudinal cross section of the beam at each cross beam lofting position according to the pier position line associated with each cross beam lofting position and the box beam main body cross section at each cross beam lofting position includes: when the pier position line associated with the cross beam lofting position does not exceed the lower edge line of the box beam main body cross section, using the box beam main body cross section at the cross beam lofting position as the longitudinal cross section of the beam at the cross beam lofting position; when the pier position line associated with the cross beam lofting position exceeds the lower edge line of the box beam main body cross section and does not exceed the upper edge line of the box beam main body cross section, extending the lower edge line in a straight line toward the first horizontal direction The method comprises the steps of: extending the box girder main body cross section to the first position in a straight line manner, and determining a closed area as the longitudinal cross section of the beam at the cross beam lofting position according to the box girder main body cross section and the extended lower edge line; when the pier position line associated with the cross beam lofting position exceeds the upper edge line of the box girder main body cross section, extending the lower edge line in a straight line manner toward the first horizontal direction to the first position, and extending the upper edge line in a straight line manner toward the second horizontal direction to the second position, and determining a closed area as the longitudinal cross section of the beam at the cross beam lofting position according to the box girder main body cross section, the extended lower edge line and the extended upper edge line.

[0016] Optionally, the staking out of the longitudinal section of the beam associated with each pier position line to construct a three-dimensional model of the beam at each pier position line includes: when the pier position line is a broken line pier position line, determining the number of second line segments of the broken line pier position line; dividing each longitudinal section of the beam associated with the broken line pier position line into a plurality of plane sub-areas with the same number of second line segments according to the turning positions of the broken line pier position line; dividing the plane sub-areas associated with the same line segment of the broken line pier position line in all the longitudinal sections of the beams associated with the broken line pier position line into a group; staking out each group of plane sub-areas to obtain spatial areas with the second number of line segments, and using the spatial areas with the second number of line segments as the three-dimensional model of the beam at the broken line pier position line.

[0017] Another aspect of the present invention provides a three-dimensional modeling device for a cast-in-place box girder, the device comprising: an acquisition module, used to acquire a target road three-dimensional model, and determine two pavement side lines, multiple box girder main body layout positions and multiple pier position lines in the target road three-dimensional model; a first construction module, used to construct a box girder main body cross-section at each box girder main body layout position according to the two pavement side lines; a layout module, used to layout all constructed box girder main body cross-sections to construct a box girder main body three-dimensional model; a second construction module, used to construct a box chamber three-dimensional model and a crossbeam three-dimensional model at each pier position line based on the box girder main body three-dimensional model; a generation module, used to merge the box girder main body three-dimensional model with all constructed crossbeam three-dimensional models after deducting the box chamber three-dimensional model, so as to generate a cast-in-place box girder three-dimensional model.

[0018] Yet another aspect of the present invention provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the three-dimensional modeling method of the cast-in-place box girder described in any of the above embodiments when executing the computer program.

[0019] Another aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the three-dimensional modeling method of a cast-in-place box girder described in any of the above embodiments is implemented.

[0020] The cast-in-place box girder 3D modeling method provided by the present invention takes into account that the side edge line of the road can represent the overall trend of the road, constructs the box girder main body cross-section at each box girder main body lofting position through the side edge line of the road, takes into account the actual data of the road, and improves the accuracy of the box girder main body 3D modeling results; and constructs the box chamber 3D model and the crossbeam 3D model based on the box girder main body 3D model, which also correspondingly improves the accuracy of the box chamber 3D model and the crossbeam 3D model, so that the final cast-in-place box girder 3D model can adapt to various complex and changeable road shapes, overcoming the defect that the cast-in-place box girder modeling method in the prior art does not have universal applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0022] In the attached picture:

[0023] Figure 1 A flow chart of a three-dimensional modeling method for a cast-in-place box girder provided in Embodiment 1 of the present invention is shown;

[0024] Figure 2 A schematic diagram showing a cross section of a box girder body provided in Embodiment 1 of the present invention is shown;

[0025] Figure 3 A schematic diagram showing the newly added box girder main body lofting position and the box girder main body cross section provided in the first embodiment of the present invention is shown.

[0026] Figure 4 A schematic diagram of a variable height box beam provided in Embodiment 1 of the present invention is shown;

[0027] Figure 5 A schematic diagram showing a cross section of a box girder main body of a double-slope carriageway provided in Embodiment 1 of the present invention is shown;

[0028] Figure 6 A schematic diagram of a cross section of a chamber provided in Embodiment 1 of the present invention is shown;

[0029] Figure 7 A schematic diagram of modeling the end of a box compartment fold line provided in the first embodiment of the present invention is shown;

[0030] Figure 8 A schematic diagram of a three-dimensional model of chamber end contraction provided by the first embodiment of the present invention is shown;

[0031] Fig. 9 A schematic diagram of determining the side of the chamber cross section provided by the first embodiment of the present invention is shown;

[0032] Fig.10 A schematic diagram of constructing a longitudinal section of a beam provided in Embodiment 1 of the present invention is shown;

[0033] Fig.11 A schematic diagram of a broken line pier position line at an interchange bifurcation provided by the first embodiment of the present invention is shown;

[0034] Fig.12 A schematic diagram of block modeling of a beam at an interchange bifurcation provided by the first embodiment of the present invention is shown;

[0035] Fig.13 A schematic diagram of a three-dimensional model of a cast-in-place box girder provided in Embodiment 1 of the present invention is shown;

[0036] Fig.14 A block diagram of a three-dimensional modeling device for a cast-in-situ box girder provided in a second embodiment of the present invention is shown;

[0037] Fig.15 A block diagram of a computer device suitable for implementing a three-dimensional modeling method for a cast-in-place box girder provided in a third embodiment of the present invention is shown. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0040] Embodiment 1

[0041] When building a 3D model of a bridge, first build a 3D model of the road, then build a 3D model of the beam, and finally merge the two to obtain the 3D model of the bridge. The purpose of this embodiment is to design a universal 3D modeling method for cast-in-place box beams when the beam is a cast-in-place box beam, so as to create a 3D model of a cast-in-place box beam that is suitable for the 3D road model regardless of the shape of the 3D road model. Specifically, Figure 1FIG. 1 shows a flow chart of a three-dimensional modeling method for a cast-in-place box beam provided in Embodiment 1 of the present invention. Figure 1 As shown, the cast-in-place box beam three-dimensional modeling method includes steps S1 to S5, wherein:

[0042] Step S1, obtaining a target road three-dimensional model, and determining two road surface side lines, a plurality of box girder main body lofting positions and a plurality of pier position lines in the target road three-dimensional model.

[0043] The target road 3D model is the bridge deck road 3D model for which the cast-in-place box girder 3D model needs to be generated. The two road side lines are the bridge deck side lines located on the left and right sides of the road centerline. The cast-in-place box girder includes the box girder body, the box chamber and the crossbeam; the bridge between adjacent expansion joints is called a unit, the bridge between adjacent piers is called a span, and a unit includes two spans or more; the crossbeam includes the end crossbeam and the middle crossbeam, the crossbeam located at the expansion joint is the end crossbeam, and the crossbeam connecting the two span beams is the middle crossbeam; each crossbeam is provided with a pier, and the connection line of all the piers under each crossbeam is the pier position line, where the pier can also be called a pier column or pier position.

[0044] Multiple representations are two or more, and the multiple box girder main body layout positions are the layout paths of the box girder main body, and the layout paths change with the upper road. Specifically, the layout path is the characteristic piles of the bridge deck road, and the characteristic piles are composed of the road flat curve characteristic piles and vertical curve characteristic piles; among them, the flat curve characteristic piles include the pile numbers of the road width change section, the pile numbers of the transition curve section, and the pile numbers of the circular curve section, and the vertical curve characteristic piles are generally the change points of the longitudinal slope.

[0045] Step S2, constructing a box girder main body cross section at each box girder main body lofting position according to the two road side lines.

[0046] The side line of the road surface can represent the overall trend of the road. The cross section of the box girder at each box girder main body lofting position is constructed through the side line of the road surface, taking into account the actual data of the road and improving the accuracy of the modeling results. Figure 2 .

[0047] Optionally, step S2 includes steps S21 to S23, wherein:

[0048] Step S21, identifying in the target road three-dimensional model the road three-dimensional sub-models required for generating the three-dimensional model of each span of the cast-in-place box girder; wherein each road three-dimensional sub-model includes two pier position lines;

[0049] Step S22, determining the layout direction of the box girder main body cross section at each box girder main body lofting position in the three-dimensional road sub-model according to the positional relationship between the two pier position lines in the three-dimensional road sub-model;

[0050] Step S23, constructing a box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model according to the two road side edge lines and the layout direction.

[0051] Each span cast-in-place box girder 3D model is a cast-in-place box girder between two pier lines, and each road 3D sub-model is a bridge deck road corresponding to the upper part of the span cast-in-place box girder 3D model. This embodiment takes one of the road 3D sub-models as an example to elaborate on the specific construction scheme of the box girder main body cross section at each box girder main body lofting position in the road 3D sub-model. The box girder main body cross section construction schemes corresponding to other road 3D sub-models can be implemented according to steps S21 to S23.

[0052] Optionally, the main cross-section of the box girder is perpendicular to the route by default, but the main cross-section of the box girder at the oblique pier position line will adopt the angle of the pier position, and will affect the layout direction of the main cross-section of the box girder within a certain distance on both sides, where the layout direction is a specific angle, such as the angle with the center line of the road. Specifically, if the oblique angles of the two piers of a span are the same, all the lofted sections in the span will use this angle; if the oblique angles of the two piers of a span are different, the lofted sections in the span should gradually transition in angle according to the pile number. For example, if one pier is oblique and the other is orthogonal, a new main cross-section of the box girder perpendicular to the center point of the road should be added next to the oblique pier position. The first newly added main cross-section of the box girder is called a control section. Specifically, step S22 includes steps S221 to S223, where:

[0053] Step S221, determining the positional relationship between two pier lines in the three-dimensional road sub-model;

[0054] Step S222, when the positional relationship is a parallel relationship, determining that the arrangement direction of the box girder main body cross section at each box girder main body lofting position in the three-dimensional road sub-model is parallel to the direction of the two pier position lines;

[0055] Step S223, when the positional relationship is a non-parallel relationship, a box girder main body layout position is added in the road three-dimensional sub-model, and the layout direction of the box girder main body cross section at each box girder main body layout position in the road three-dimensional sub-model is determined to be perpendicular to the direction of the road centerline in the road three-dimensional sub-model.

[0056] The pier position lines include orthogonal pier position lines and oblique pier position lines. The orthogonal pier position lines are straight pier position lines perpendicular to the center line of the road, and the oblique pier position lines are straight pier position lines or broken line pier position lines that are not perpendicular to the center line of the road. The two pier position lines in a parallel relationship can both be orthogonal pier position lines, or both can be straight pier position lines among the oblique pier position lines. The two pier position lines in a non-parallel relationship can both be oblique pier position lines, or one can be an oblique pier position line and the other an orthogonal pier position line. It should be noted that only the pier position lines at the end crossbeams can be broken line pier position lines.

[0057] like Figure 3 As shown, the pier position line at position A is a broken line pier position line among the oblique pier position lines, the pier position lines at positions B and C are straight line pier position lines among the oblique pier position lines, and the pier position line at position D is an orthogonal pier position line; the positional relationship between the pier position lines at positions B and C is a parallel relationship, and the arrangement direction of the box girder main body cross section between positions B and C is parallel to the pier position lines at positions B and C; the positional relationship between the pier position line at position C and the pier position line at position D is a non-parallel relationship, and a box girder main body layout position C' can be added at positions C and D, and at this time, the arrangement direction of the box girder main body cross section at each box girder main body layout position between positions C and D is determined to be perpendicular to the road centerline.

[0058] Optionally, in step S223, “adding a box girder main body layout position in the road three-dimensional sub-model” includes:

[0059] Identifying an oblique pier position line from two pier position lines of the three-dimensional road sub-model;

[0060] Determining a box girder main body lofting position adjacent to the oblique pier position line in the three-dimensional road sub-model;

[0061] A box girder main body lofting position is added between the oblique pier position line and the box girder main body lofting position adjacent to the oblique pier position line.

[0062] The identified oblique pier position lines may be limited to straight line pier position lines.

[0063] Optionally, the minimum distance between the control section and the oblique pier position line at the side edge of the road surface should meet the modeling accuracy tolerance, that is, greater than or equal to the second preset distance, wherein the distance is inversely proportional to the curvature of the edge. If at this time the maximum distance between the control section and the oblique pier position line at the side edge of the road surface is greater than the first preset distance, then a number of box girder main body cross sections should be added between the control section and the oblique pier position line, wherein a number represents one or more, and the subsequently added box girder main body cross sections are called supplementary sections. Specifically, after step S23, the method further includes:

[0064] Determine whether the maximum distance between the oblique pier position line and the box girder main body cross section at the newly added box girder main body lofting position is less than or equal to a first preset distance;

[0065] When it is less than or equal to the first preset distance, stop adding the box girder main body lofting position;

[0066] When it is greater than the first preset distance, the main body of the box girder is re-determined in the three-dimensional road sub-model to be adjacent to the oblique pier position line, and a new main body of the box girder is added between the oblique pier position line and the re-determined main body of the box girder adjacent to the oblique pier position line. An angle between 90 degrees and the angle of the oblique pier position line is selected as the layout direction, and the main body of the box girder at the newly added main body of the box girder is constructed according to the two road side lines and the selected layout direction. The minimum distance of the newly added main body of the box girder from the oblique pier position line is greater than or equal to the second preset threshold value, and when the maximum distance of the main body of the box girder from the oblique pier position line is greater than the first preset threshold value, the operation of "re-determining the main body of the box girder adjacent to the oblique pier position line in the three-dimensional road sub-model" is returned to be executed until the minimum distance between the oblique pier position line and the main body of the box girder currently adjacent to the oblique pier position line is greater than or equal to the second preset distance and the maximum distance is less than or equal to the first preset distance.

[0067] like Figure 3 As shown, two new box girder main body layout positions A' and B' are added between position A and position B. The box girder main body cross section at the first new box girder main body layout position A' is perpendicular to the road centerline; the layout direction (i.e., the inclination angle) of the box girder main body cross section at the second new box girder main body layout position B' is between 90 degrees and the angle of the oblique pier position line at position B, wherein the minimum distance between the second new box girder main body cross section and the oblique pier position line at position B is greater than or equal to the second preset distance and the maximum distance is less than or equal to the second preset distance.

[0068] Optionally, step S23 includes steps S231 to S234, wherein:

[0069] Step S231, moving the two road surface side edge lines vertically downward by the road thickness of the three-dimensional road model to obtain two flange plate top surface side edge lines;

[0070] Step S232, obtaining a preset flange plate outer edge thickness and flange plate width, and determining a box girder thickness corresponding to the flange plate width;

[0071] Step S233, performing N vector shifts on each flange top surface side line according to the flange outer edge thickness, the flange width, and the box girder thickness corresponding to the flange width, so as to obtain characteristic lines at N preset positions on the flange bottom surface adjacent to each flange top surface side line;

[0072] Step S234, obtaining the pier position line closest to the box girder main body lofting position, intersecting the pier position line with the two flange plate top surface side lines and the characteristic lines at all preset positions respectively, and connecting all intersections into a closed area as the box girder main body cross section at the box girder main body lofting position.

[0073] Specifically, the two side edge lines of the top surface of the flange plate can be moved vertically downward by the thickness of the outer edge of the flange plate to obtain the two side edge lines of the bottom surface of the flange plate; according to the width of the flange plate and the box beam thickness corresponding to the width of the flange plate, each side edge line of the top surface of the flange plate is vector-shifted N-1 times to obtain the characteristic lines at N-1 preset positions in the bottom surface of each flange plate. This embodiment solves the problem of the flange plate edge being not parallel to the road surface edge in the prior art, and improves the safety and stability of the model. Figure 2 As shown, taking one of the road side lines as an example, after moving it vertically downward by the thickness of the road, a characteristic line of point 1 is obtained, wherein the characteristic line of point 1 is a side line of the top surface of the flange plate; the characteristic line of point 1 is moved vertically downward by the thickness of the outer edge of the flange plate to obtain a characteristic line of point 2; according to the flange plate width and the box girder thickness corresponding to the flange plate width, the characteristic line of point 1 is vector-shifted 6 times respectively to obtain characteristic lines of points 3 to 8; after the pier position line is intersected with the lines of points 1 to 8, all intersections are connected into a closed area to obtain the box girder main body cross section at the box girder main body lofting position.

[0074] Optionally, generally shorter spans (e.g., less than 40m) use uniform height box girders, longer spans use variable height box girders, and the height change of the variable height box girders uses a quadratic parabola transition. Specifically, in step S232, "determining the box girder thickness corresponding to the flange plate width" includes:

[0075] When the box girder main body lofting position is located within a preset range of box girder with equal height, the box girder thickness associated with the range of box girder with equal height is obtained as the box girder thickness corresponding to the flange plate width;

[0076] When the main body lofting position of the box girder is within the preset variable height box girder range, the box girder thickness corresponding to the flange plate width is obtained according to formula (1); wherein the formula (1) is:

[0077] y=x 2 (d h -k h ) / p h2 ;

[0078] y is the thickness of the box beam, x is [0, p h ] any value in the range, d h is the height of the pier top beam, k h is the mid-span beam height, p h It is the length of the mid-span beam height parabola, that is, the length of the variable height box beam range.

[0079] Specifically, if the three-dimensional model of the box girder is a box girder with equal height, the range of the box girder with equal height is the span range of the three-dimensional model of the box girder, and the box girder thickness associated with the range of the box girder with equal height is the thickness of the three-dimensional model of the box girder; if the three-dimensional model of the box girder is a box girder with variable height, since the variable height box girder contains some sections of equal height box girder and some sections of variable height box girder, the range of the box girder with equal height is part of the span range of the three-dimensional model of the box girder, and the range of the box girder with variable height is also part of the span range of the three-dimensional model of the box girder. Wherein, when x is the width of the flange plate, y is the box girder thickness corresponding to the width of the flange plate. Figure 4 As shown, formula (1) is "y = x 2 (250-200) / (1500 2 )”.

[0080] Optionally, in step S234, “connecting the intersections into a closed area as the cross section of the box girder body at the box girder body lofting position” includes:

[0081] Acquire a road surface cross slope line at the box girder main body lofting position from the target road three-dimensional model;

[0082] The road surface cross slope line is vertically moved downward by the road thickness to obtain a candidate upper edge line, and the upper edge line is vertically moved downward by the box girder thickness corresponding to the flange plate width to obtain a candidate lower edge line;

[0083] A closed area is determined according to the candidate upper edge line, the candidate lower edge line and all intersection points as the cross section of the box girder body at the box girder body lofting position.

[0084] The cross slope is a detail treatment in the design of the main cross section of the box girder. There are two cases of cross slope treatment, one is double slope and the other is single slope. If the bridge deck is a double slope carriageway, it will be treated as a double slope, otherwise it will be treated as a single slope. In the case of double slope, the bridge ridgeline is the ridgeline of the double slope carriageway. The upper and lower lines of the main cross section of the box girder are parallel, but they are not obtained by offsetting the road cross slope line by the beam height, but by vertically translating the cross slope line downward to the beam height. When generating the main cross section of the box girder, all dimensions in the width direction refer to the dimensions in the XY plane and do not change with the cross slope; all dimensions in the height direction refer to the dimensions in the Z direction and do not change with the cross slope. In addition, all vertical lines on the main cross section of the box girder are completely vertical and will not tilt with the cross slope; but all horizontal lines use the slope of the cross slope, that is, they are obtained by translating the cross slope line downward.

[0085] Specifically, the candidate upper edge line is intersected with the side edge lines of the two flange plate top surfaces to obtain the upper edge line of the box girder main cross section, and the candidate lower edge line is intersected with the two lowest characteristic lines on the bottom surfaces of the two flange plates to obtain the lower edge line of the box girder main cross section. The upper edge line, the lower edge line and all intersection points form a closed area as the box girder main cross section. Figure 5 As shown, the candidate upper edge line can be directly used as the upper edge line of the cross section of the box girder body, and the solid line part of the candidate lower edge line is the lower edge line of the cross section of the box girder body.

[0086] Step S3, lofting all constructed box girder main body cross sections to construct a three-dimensional model of the box girder main body.

[0087] During the lofting process, the top surface of the road 3D model can be used as the top surface of the box girder main body 3D model; and when the box girder is an equal-height box girder, the thickness of the box girder main body 3D model is the preset box girder thickness; when the box girder is an equal-height box girder, the thickness of the box girder main body 3D model at the box girder height change position can be determined according to the above formula (1).

[0088] Step S4, constructing a three-dimensional model of the box chamber and a three-dimensional model of the crossbeam at each pier line based on the three-dimensional model of the box girder body as basic data.

[0089] The three-dimensional model of the box room is obtained by lofting the box room cross section at each box room lofting position, and the box room cross section at each box room lofting position is obtained by the box girder main cross section at each box room lofting position; the three-dimensional model of the crossbeam is obtained by lofting the cross beam longitudinal section at each cross beam lofting position, and the cross beam longitudinal section at each cross beam lofting position is obtained by the box girder main cross section at each cross beam lofting position. Therefore, this implementation needs to first construct a three-dimensional model of the box girder main body, and then use the three-dimensional model of the box girder main body as the basic data to obtain the box girder main cross section at each box room lofting position and the box girder main cross section at each cross beam lofting position, and then construct the three-dimensional model of the box room and the three-dimensional model of the cross beam.

[0090] Optionally, in step S4, "building a three-dimensional model of the box chamber based on the three-dimensional model of the box girder body" includes steps S41 to S44, wherein:

[0091] Step S41, determining a plurality of chamber layout positions in the target road three-dimensional model; wherein the plurality of chamber layout positions include positions of a plurality of broken line pier lines;

[0092] Step S42, identifying the box girder main body cross section at each box chamber lofting position from the box girder main body three-dimensional model;

[0093] Step S43, obtaining the preset relative parameters of each chamber at each chamber lofting position, and constructing the chamber cross section at each chamber lofting position according to the preset relative parameters of each chamber at each chamber lofting position and the cross section of the box beam body; wherein the preset relative parameters of the chamber are used to characterize the relative size relationship between the cross section of the box beam body and the cross section of the chamber;

[0094] Step S44, determining the number of first line segments of each broken line pier position line, and lofting all constructed chamber cross sections according to the number of each line segment to construct a three-dimensional model of the chamber.

[0095] Specifically, a typical chamber cross section is as follows: Figure 6 As shown, it is an octagon (formed by cutting off the four corners of a quadrilateral). The same bridge may become wider and taller, and the width and height of the box chamber will change accordingly. When the box chamber changes, the top plate thickness, bottom plate thickness, web plate thickness, web angle, and cutting angle dimensions determined by the box beam body are fixed, and only the width and height of the box chamber change. Therefore, the box chamber cross section can be determined by presetting the relative parameters of the box chamber and the cross section of the box beam body.

[0096] It should be noted that, taking one of the broken line pier positions as an example, the specific construction scheme of the three-dimensional model of the chamber at the broken line pier position is described in detail, and the construction schemes of the three-dimensional models of the chambers corresponding to other broken line pier positions can be implemented according to step S44. Optionally, step S44 includes:

[0097] Dividing the first chamber cross section at the fold line pier line into a plurality of plane sub-areas having the same number as the first line segments according to the turning positions of the fold line pier line;

[0098] Divide the second chamber cross section closest to the first chamber cross section into a plurality of plane sub-areas having the same number as the first line segments according to the turning position of the pier position line in the folded line shape;

[0099] Dividing the plane sub-areas associated with the same line segment of the pier position line in the first chamber cross section and the second chamber cross section into one group;

[0100] Stake out each group of plane sub-regions to obtain the spatial regions of the first number of line segments;

[0101] The three-dimensional model of the chamber is constructed according to the spatial area of ​​the first number of line segments and the remaining chamber cross-section.

[0102] Specifically, when the end beam has a broken line, that is, when the box room layout position is the position of the broken line pier position line, the box room at the turning point will also have a broken line end. When modeling the broken line end of the box room, it needs to be split from the turning point. Figure 7 As shown, the turning point is divided into two areas AB, and then the whole box is modeled. It should be noted that this embodiment takes one of the broken line pier positions as an example to elaborate on the specific construction scheme of the box three-dimensional model at the broken line pier position line, and the construction schemes of the box three-dimensional models corresponding to other broken line pier positions can be implemented according to step S44.

[0103] Optionally, when defining the chamber, you can only define the size of the standard segment. In fact, the two ends of the chamber will shrink to increase the thickness of the top plate, bottom plate, and web near the beam. You can create shrink shapes as needed, such as Figure 8 The sides of the chamber are either inclined or vertical and must be consistent with the adjacent webs, such as Fig. 9 shown.

[0104] Optionally, in step S4, "using the three-dimensional model of the box girder body as basic data to construct a three-dimensional model of the cross beam at each pier position line" includes steps S41' to S44', wherein:

[0105] Step S41', determining a plurality of beam layout positions according to each pier line in the target road three-dimensional model;

[0106] Step S42', identifying the box girder main body cross section at each crossbeam lofting position from the box girder main body three-dimensional model;

[0107] Step S43', constructing a longitudinal cross section of each beam lofting position according to the pier position line associated with each beam lofting position and the cross section of the box girder body at each beam lofting position;

[0108] Step S44', lofting the longitudinal section of the beam associated with each pier line to construct a three-dimensional model of the beam at each pier line.

[0109] Specifically, one or more beam stakeout positions can be determined according to each pier position line. The following is an example of determining two beam stakeout positions according to each pier position line. When the beam is an end beam, the position of the pier position line is used as the first beam stakeout position, and the pier position line is offset by half the width of the end beam toward the joint center of the target road three-dimensional model to obtain the second beam stakeout position; when the beam is a middle beam, the pier position line is offset by half the width of the middle beam to both sides to obtain two beam stakeout positions.

[0110] It should be noted that, taking one of the beam lofting positions as an example, the specific construction scheme of the beam longitudinal section at the beam lofting position is described in detail below, and the construction schemes of the beam longitudinal section at other beam lofting positions can be implemented according to step S43'. Optionally, step S43' may include:

[0111] When the pier position line associated with the crossbeam lofting position does not exceed the lower edge line of the box girder main body cross section, the box girder main body cross section at the crossbeam lofting position is used as the crossbeam longitudinal section at the crossbeam lofting position;

[0112] When the pier position line associated with the cross beam lofting position exceeds the lower edge line of the cross section of the box beam body and does not exceed the upper edge line of the cross section of the box beam body, the lower edge line is extended in a straight line in a first horizontal direction to a first position, and a closed area is determined as the longitudinal section of the cross beam at the cross beam lofting position according to the cross section of the box beam body and the extended lower edge line;

[0113] When the pier position line associated with the crossbeam lofting position exceeds the upper edge line of the box girder main body cross section, the lower edge line is extended in a straight line toward the first horizontal direction to the first position, and the upper edge line is extended in a straight line toward the second horizontal direction to the second position, and a closed area is determined as the longitudinal section of the crossbeam at the crossbeam lofting position according to the box girder main body cross section, the extended lower edge line and the extended upper edge line.

[0114] Specifically, after the pier position line is translated to the crossbeam layout position: the first horizontal direction is the direction in which the translated pier position line exceeds the lower edge line, and the straight line formed by the endpoint at the first position and the endpoint of the pier position line after the translation in the first horizontal direction is the vertical direction; the second horizontal direction is the direction in which the pier position line exceeds the upper edge line, and the straight line formed by the endpoint at the second position and the endpoint of the pier position line after the translation in the second horizontal direction is the vertical direction.

[0115] The structure of the longitudinal section of the cross beam is related to the longitudinal section of the box beam. If the pier position does not exceed the edge line, the longitudinal section of the cross beam can follow the cross section of the box beam. If the pier position exceeds the edge line, the excess part can be extended along the straight line of the edge line of the box beam cross section. If the vertical direction does not exceed the range of the box beam flange plate (that is, the pier position line exceeds the lower edge line but does not exceed the upper edge line), it will extend vertically from the bottom of the corresponding side flange plate to the bottom. If it exceeds the vertical direction, the vertical part can be directly closed with a straight line. For details, please refer to Fig.10 .

[0116] It should be noted that, taking one of the broken line pier positions as an example, the specific construction scheme of the beam three-dimensional model at the broken line pier position is described in detail, and the construction schemes of the beam three-dimensional models corresponding to other broken line pier positions can be implemented according to step S44'. Optionally, step S44' may include:

[0117] When the pier position line is a broken line pier position line, determining the number of second line segments of the broken line pier position line;

[0118] According to the turning positions of the broken line pier position lines, each longitudinal cross section of the beam associated with the broken line pier position lines is divided into a plurality of plane sub-areas having the same number as the second line segments;

[0119] Dividing the plane sub-areas associated with the same line segment of the broken line pier position line in all longitudinal sections of the beams associated with the broken line pier position line into one group;

[0120] Each group of plane sub-areas is lofted to obtain a space area with the second number of line segments, and the space area with the second number of line segments is used as a three-dimensional model of the beam at the pier line with the broken line shape.

[0121] Specifically, determining all the longitudinal sections of the beams associated with the broken line pier position line is as follows: determining the lofting positions of all the beams associated with the broken line pier position line, and using the longitudinal sections of the beams at the lofting positions of all the beams associated with the broken line pier position line as the longitudinal sections of all the beams associated with the broken line pier position line. Fig.11 As shown in the figure, the broken line pier position line is generally at the fork of the interchange. Fig.12 As shown in FIG. 1 , at the fork of the interchange, the broken line pier line has two turning positions and three line segments, and the end beam three-dimensional model is divided into three spatial regions; in addition, during modeling, the space between the end beam and the first section in the link is also divided into the spatial regions of the number of line segments, as shown in FIG. Fig.12 Block 1 to block 3 in .

[0122] Step S5, after deducting the box chamber three-dimensional model from the box girder main body three-dimensional model, merge it with all the constructed crossbeam three-dimensional models to generate a cast-in-place box girder three-dimensional model.

[0123] The schematic diagram of the three-dimensional model of the cast-in-place box girder can be referenced. Fig.13 .

[0124] The present invention has the following advantages: 1. It solves the problem that conventional box girder models cannot be used for urban roads. The three-dimensional box girder model created by the present invention can not only adapt to the variable width of urban roads, but also ensure that the edge of the wing plate is parallel to the edge of the road surface, and has a targeted design for interchanges; 2. The model is more realistic, and various practical factors such as box room details, crossbeam details, road surface cross slope, box girder height change, oblique pier position line, etc. are considered in the modeling, and the comprehensive modeling accuracy is high; 3. It has stronger applicability. This modeling scheme is not only applicable to urban road bridges and urban elevated bridges, but also to highway bridges.

[0125] Embodiment 2

[0126] The second embodiment of the present invention further provides a three-dimensional modeling device for a cast-in-place box girder, which corresponds to the three-dimensional modeling method for a cast-in-place box girder provided in the first embodiment above. The corresponding technical features and technical effects are not described in detail in this embodiment, and the relevant parts can be referred to the first embodiment above. Specifically, Fig.14 FIG. 2 shows a block diagram of a three-dimensional modeling device for a cast-in-place box beam provided in Embodiment 2 of the present invention. Fig.14 As shown, the cast-in-place box beam three-dimensional modeling device 1400 may include:

[0127] The acquisition module 1401 is used to acquire a target road three-dimensional model, and determine two road side lines, a plurality of box girder main body lofting positions and a plurality of pier position lines in the target road three-dimensional model;

[0128] The first construction module 1402 is used to construct the box girder main body cross section at each box girder main body setting out position according to the two road side lines;

[0129] The lofting module 1403 is used to loft all constructed box girder main body cross sections to construct a three-dimensional model of the box girder main body;

[0130] The second construction module 1404 is used to construct a three-dimensional model of the box chamber and a three-dimensional model of the crossbeam at each pier line based on the three-dimensional model of the box girder body;

[0131] The generation module 1405 is used to merge the three-dimensional model of all the constructed crossbeams with the three-dimensional model of the box girder body after deducting the three-dimensional model of the box chamber, so as to generate a three-dimensional model of the cast-in-place box girder.

[0132] Optionally, the first construction module includes: a first identification unit, used to identify the road three-dimensional sub-model required for generating the three-dimensional model of each span of the cast-in-place box girder in the target road three-dimensional model; wherein each road three-dimensional sub-model includes two pier position lines; a first determination unit, used to determine the layout direction of the box girder main cross-section at each box girder main body layout position in the road three-dimensional sub-model according to the positional relationship between the two pier position lines in the road three-dimensional sub-model; and a first construction unit, used to construct the box girder main body cross-section at each box girder main body layout position in the road three-dimensional sub-model according to the two pavement side lines and the layout direction.

[0133] Optionally, the first determination unit includes: a first determination subunit, used to determine the positional relationship between two pier position lines in the road three-dimensional sub-model; a second determination subunit, used to determine, when the positional relationship is a parallel relationship, that the arrangement direction of the box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model is parallel to the direction of the two pier position lines; a third determination subunit, used to add a box girder main body lofting position in the road three-dimensional sub-model when the positional relationship is a non-parallel relationship, and determine that the arrangement direction of the box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model is perpendicular to the direction of the road centerline in the road three-dimensional sub-model.

[0134] Optionally, when the third determination subunit executes the step of adding a box girder main body layout position in the road three-dimensional sub-model, it is specifically used to: identify the oblique pier position line from the two pier position lines of the road three-dimensional sub-model; determine the box girder main body layout position adjacent to the oblique pier position line in the road three-dimensional sub-model; and add a box girder main body layout position between the oblique pier position line and the box girder main body layout position adjacent to the oblique pier position line.

[0135] Optionally, the first construction unit includes: a moving subunit, used to move the two road surface side edge lines vertically downward by the road thickness of the road three-dimensional model to obtain two flange top surface side edge lines; an acquisition subunit, used to obtain a preset flange outer edge thickness and flange width, and determine the box girder thickness corresponding to the flange width; a vector offset subunit, used to perform N vector offsets on each flange top surface side edge line according to the flange outer edge thickness, the flange width and the box girder thickness corresponding to the flange width, so as to obtain characteristic lines at N preset positions in the flange bottom surface adjacent to each flange top surface side edge line; the first construction subunit is used to obtain the pier position line closest to the box girder main body lofting position, intersect the pier position line with the two flange top surface side edge lines and the characteristic lines at all preset positions, and connect all intersections into a closed area as the box girder main body cross section at the box girder main body lofting position.

[0136] Optionally, when the determination of the box girder thickness corresponding to the flange plate width is performed by the acquisition subunit, the acquisition subunit is specifically used to: when the main body lofting position of the box girder is located within a preset range of equal height box girder, acquire the box girder thickness associated with the range of equal height box girder as the box girder thickness corresponding to the flange plate width; when the main body lofting position of the box girder is located within a preset range of variable height box girder, acquire the box girder thickness corresponding to the flange plate width according to formula (1); wherein the formula (1) is: y=x 2 (d h -k h ) / p h 2 ; y is the thickness of the box beam, x is [0, p h ] any value in the range, d h is the height of the pier top beam, k h is the mid-span beam height, p h is the length of the variable height box girder range.

[0137] Optionally, when the second construction module constructs a box chamber three-dimensional model based on the three-dimensional model of the box girder body as basic data, it includes: a second determination unit, used to determine multiple box chamber layout positions in the target road three-dimensional model; wherein the multiple box chamber layout positions include the positions of several broken line pier position lines; a second identification unit, used to identify the box girder body cross-section at each box chamber layout position from the three-dimensional model of the box girder body; a second construction unit, used to obtain preset box chamber relative parameters at each box chamber layout position, and construct the box chamber cross-section at each box chamber layout position according to the preset box chamber relative parameters at each box chamber layout position and the box girder body cross-section; wherein the preset box chamber relative parameters are used to characterize the relative size relationship between the box girder body cross-section and the box chamber cross-section; a first layout unit, used to determine the number of first line segments of each broken line pier position line, and layout all constructed box chamber cross-sections according to the number of each first line segment to construct a box chamber three-dimensional model.

[0138] Optionally, when executing the lofting of all the chamber cross sections constructed according to each first line segment number to construct the chamber three-dimensional model, the first lofting unit includes: a first dividing sub-unit, for dividing the first chamber cross section at the broken line pier position line into a plurality of plane sub-regions with the same number of the first line segments according to the turning position of the broken line pier position line; a second dividing sub-unit, for dividing the second chamber cross section closest to the first chamber cross section into a plurality of plane sub-regions with the same number of the first line segments according to the turning position of the broken line pier position line; a third dividing sub-unit, for dividing the plane sub-regions associated with the same line segment of the broken line pier position line in the first chamber cross section and the second chamber cross section into a group; a first lofting sub-unit, for lofting each group of plane sub-regions to obtain the spatial area with the first number of line segments; a second constructing sub-unit, for constructing the chamber three-dimensional model according to the spatial area with the first number of line segments and the remaining chamber cross sections.

[0139] Optionally, the second construction module, when executing the construction of the three-dimensional model of the beam at each pier position line based on the three-dimensional model of the box girder body, includes: a third determination unit, used to determine a number of beam layout positions according to each pier position line in the target road three-dimensional model; a third identification unit, used to identify the box girder body cross-section at each beam layout position from the three-dimensional model of the box girder body; a third construction unit, used to construct the longitudinal section of the beam at each beam layout position according to the pier position lines associated with each beam layout position and the box girder body cross-section at each beam layout position; and a second layout unit, used to layout the longitudinal section of the beam associated with each pier position line to construct the three-dimensional model of the beam at each pier position line.

[0140] Optionally, the third construction unit includes: a third construction subunit, which is used to use the box girder main body cross section at the cross beam lofting position as the cross beam longitudinal section at the cross beam lofting position when the pier position line associated with the cross beam lofting position does not exceed the lower edge line of the box girder main body cross section; a fourth construction subunit, which is used to extend the lower edge line in a straight line in the first horizontal direction to the first position when the pier position line associated with the cross beam lofting position exceeds the lower edge line of the box girder main body cross section and does not exceed the upper edge line of the box girder main body cross section, and according to the box girder main body The cross-section and the extended lower edge line determine a closed area as the longitudinal cross-section of the beam at the cross-beam lofting position; the fifth construction subunit is used to extend the lower edge line in a straight line toward the first horizontal direction to the first position when the pier line associated with the cross-section of the cross-beam exceeds the upper edge line of the box girder main body cross-section, and extend the upper edge line in a straight line toward the second horizontal direction to the second position, and determine a closed area as the longitudinal cross-section of the beam at the cross-beam lofting position according to the box girder main body cross-section, the extended lower edge line and the extended upper edge line.

[0141] Optionally, the second lofting unit includes: a fourth determining subunit, used to determine the number of second line segments of the fold-line pier position line when the pier position line is a fold-line pier position line; a fourth dividing subunit, used to divide each longitudinal section of the beam associated with the fold-line pier position line into a plurality of plane sub-areas with the same number of the second line segments according to the turning positions of the fold-line pier position line; a fifth dividing subunit, used to divide the plane sub-areas associated with the same line segment of the fold-line pier position line in all longitudinal sections of the beams associated with the fold-line pier position line into a group; a second lofting subunit, used to loft each group of plane sub-areas to obtain spatial areas with the second number of line segments, and use the spatial areas with the second number of line segments as the three-dimensional model of the beam at the fold-line pier position line.

[0142] Embodiment 3

[0143] Fig.15 The block diagram of a computer device suitable for implementing the method for calculating the installation height of a group of towers provided in the third embodiment of the present invention is shown. In this embodiment, the computer device 1500 may be a smart phone, tablet computer, laptop computer, desktop computer, rack server, blade server, tower server or cabinet server (including an independent server or a server cluster composed of multiple servers) that executes a program. Fig.15 As shown, the computer device 1500 of this embodiment includes at least but is not limited to: a memory 1501, a processor 1502, and a network interface 1503 that can be interconnected through a system bus. It should be noted that Fig.15Only computer device 1500 having components 1501 - 1503 is shown, but it should be understood that implementing all of the components shown is not a requirement, and more or fewer components may alternatively be implemented.

[0144] In this embodiment, the memory 1503 includes at least one type of computer-readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 1501 can be an internal storage unit of the computer device 1500, such as a hard disk or memory of the computer device 1500. In other embodiments, the memory 1501 can also be an external storage device of the computer device 1500, such as a plug-in hard disk equipped on the computer device 1500, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Of course, the memory 1501 can also include both the internal storage unit of the computer device 1500 and its external storage device. In this embodiment, the memory 1501 is generally used to store an operating system and various application software installed on the computer device 1500, such as program codes of a three-dimensional modeling method for cast-in-place box girders.

[0145] In some embodiments, the processor 1502 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chips. The processor 1502 is generally used to control the overall operation of the computer device 1500. For example, the processor 1502 performs control and processing related to data interaction or communication with the computer device 1500. In this embodiment, the processor 1502 is used to run the program code of the steps of the cast-in-place box girder three-dimensional modeling method stored in the memory 1501.

[0146] In this embodiment, the three-dimensional modeling method of the cast-in-place box girder stored in the memory 1501 can also be divided into one or more program modules and executed by one or more processors (processor 1502 in this embodiment) to complete the present invention.

[0147] The network interface 1503 may include a wireless network interface or a wired network interface, and the network interface 1503 is generally used to establish a communication link between the computer device 1500 and other computer devices. For example, the network interface 1503 is used to connect the computer device 1500 to an external terminal through a network, and to establish a data transmission channel and a communication link between the computer device 1500 and the external terminal. The network can be a wireless or wired network such as an intranet, the Internet, the Global System of Mobile communication (GSM), Wideband Code Division Multiple Access (WCDMA), 4G network, 5G network, Bluetooth, Wi-Fi, etc.

[0148] Embodiment 4

[0149] This embodiment also provides a computer-readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, CD, server, App application store, etc., on which a computer program is stored, and when the computer program is executed by a processor, the steps of the three-dimensional modeling method of cast-in-place box girders are implemented.

[0150] Obviously, those skilled in the art should understand that the modules or steps of the above-mentioned embodiments of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the embodiments of the present invention are not limited to any specific combination of hardware and software.

[0151] It should be noted that the serial numbers of the embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0152] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method.

[0153] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A three-dimensional modeling method for cast-in-place box beams, characterized in that: The method comprises: Acquire a target road three-dimensional model, and determine two road side lines, a plurality of box girder main body lofting positions, and a plurality of pier position lines in the target road three-dimensional model; Constructing a box girder main body cross section at each box girder main body lofting position according to the two road side lines; Lofting all constructed box girder main body cross sections to construct a three-dimensional model of the box girder main body; The three-dimensional model of the box girder body is used as the basic data to construct a three-dimensional model of the box chamber and a three-dimensional model of the crossbeam at each pier position line; After deducting the box chamber three-dimensional model from the box girder main body three-dimensional model, the model is merged with all constructed crossbeam three-dimensional models to generate a cast-in-place box girder three-dimensional model.

2. The method according to claim 1, characterized in that The step of constructing a box girder main body cross section at each box girder main body lofting position according to the two road side lines comprises: Identifying the road three-dimensional sub-models required for generating the three-dimensional model of each span of cast-in-place box girder in the target road three-dimensional model; wherein each road three-dimensional sub-model includes two pier position lines; Determining the layout direction of the box girder main body cross section at each box girder main body lofting position in the three-dimensional road sub-model according to the positional relationship between the two pier position lines in the three-dimensional road sub-model; A box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model is constructed according to the two road surface side lines and the layout direction.

3. The method according to claim 2, characterized in that The step of determining the layout direction of the box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model according to the positional relationship between the two pier position lines in the road three-dimensional sub-model comprises: Determining the positional relationship between two pier lines in the three-dimensional road sub-model; When the positional relationship is a parallel relationship, determining that the layout direction of the box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model is parallel to the direction of the two pier position lines; When the positional relationship is a non-parallel relationship, a box girder main body layout position is added in the road three-dimensional sub-model, and the layout direction of the box girder main body cross section at each box girder main body layout position in the road three-dimensional sub-model is determined to be perpendicular to the direction of the road centerline in the road three-dimensional sub-model.

4. The method according to claim 3, characterized in that The adding of a box girder main body layout position in the road three-dimensional sub-model includes: Identifying an oblique pier position line from two pier position lines of the three-dimensional road sub-model; Determining a box girder main body lofting position adjacent to the oblique pier position line in the three-dimensional road sub-model; A box girder main body lofting position is added between the oblique pier position line and the box girder main body lofting position adjacent to the oblique pier position line.

5. The method according to claim 2, characterized in that: The step of constructing a box girder main body cross section at each box girder main body lofting position in the road three-dimensional sub-model according to the two road side lines and the layout direction includes: The two road surface side edge lines are respectively moved vertically downward by the road thickness of the road three-dimensional model to obtain two flange plate top surface side edge lines; Obtaining a preset flange plate outer edge thickness and flange plate width, and determining a box girder thickness corresponding to the flange plate width; According to the flange plate outer edge thickness, the flange plate width and the box girder thickness corresponding to the flange plate width, each flange plate top surface side edge line is respectively subjected to N vector offsets to obtain characteristic lines at N preset positions in the flange plate bottom surface adjacent to each flange plate top surface side edge line; Obtain the pier position line closest to the box girder main body lofting position, intersect the pier position line with the two flange plate top surface side lines and the characteristic lines at all preset positions respectively, and connect all intersections into a closed area as the box girder main body cross section at the box girder main body lofting position.

6. The method according to claim 5, characterized in that The step of determining the box girder thickness corresponding to the flange plate width comprises: When the box girder main body lofting position is located within a preset range of box girder with equal height, the box girder thickness associated with the range of box girder with equal height is obtained as the box girder thickness corresponding to the flange plate width; When the main body lofting position of the box girder is within the preset variable height box girder range, the box girder thickness corresponding to the flange plate width is obtained according to formula (1); wherein the formula (1) is: ； y is the thickness of the box beam, x is [0, Any value in the range of ], The height of the pier top beam is is the mid-span beam height, is the length of the variable height box girder range.

7. The method according to claim 1, characterized in that The three-dimensional model of the box girder body is used as the basic data to construct a three-dimensional model of the box chamber, including: Determine a plurality of chamber layout positions in the target road three-dimensional model; wherein the plurality of chamber layout positions include positions of a plurality of broken line pier position lines; Identify the box girder main body cross section at each box chamber lofting position from the box girder main body three-dimensional model; Obtaining preset chamber relative parameters at each chamber lofting position, and constructing a chamber cross section at each chamber lofting position according to the preset chamber relative parameters at each chamber lofting position and the box beam main body cross section; wherein the preset chamber relative parameters are used to characterize the relative size relationship between the box beam main body cross section and the chamber cross section; The number of first line segments of each broken line pier position line is determined, and all constructed chamber cross sections are staked out according to the number of first line segments to construct a three-dimensional model of the chamber.

8. The method according to claim 7, characterized in that The step of lofting all the constructed chamber cross sections according to the number of each first line segment to construct a chamber three-dimensional model includes: Dividing the first chamber cross section at the fold line pier line into a plurality of plane sub-areas having the same number as the first line segments according to the turning positions of the fold line pier line; Divide the second chamber cross section closest to the first chamber cross section into a plurality of plane sub-areas having the same number as the first line segments according to the turning position of the pier position line in the folded line shape; Dividing the plane sub-areas associated with the same line segment of the pier position line in the first chamber cross section and the second chamber cross section into one group; Stake out each group of plane sub-regions to obtain the spatial regions of the first number of line segments; The three-dimensional model of the chamber is constructed according to the spatial area of ​​the first number of line segments and the remaining chamber cross-section.

9. The method according to claim 1, characterized in that: The three-dimensional model of the cross beam at each pier line is constructed based on the three-dimensional model of the box beam body, including: Determining a plurality of beam layout positions according to each pier position line in the target road three-dimensional model; Identifying the box girder main body cross section at each crossbeam lofting position from the box girder main body three-dimensional model; According to the pier position line associated with each beam setting-out position and the box girder main body cross section at each beam setting-out position, the longitudinal cross section of the beam at each beam setting-out position is constructed; The longitudinal section of the beam associated with each pier line is lofted to construct a three-dimensional model of the beam at each pier line.

10. The method according to claim 9, characterized in that The method of constructing a longitudinal cross section of each beam lofting position according to the pier position line associated with each beam lofting position and the box girder main body cross section at each beam lofting position includes: When the pier position line associated with the crossbeam lofting position does not exceed the lower edge line of the box girder main body cross section, the box girder main body cross section at the crossbeam lofting position is used as the crossbeam longitudinal section at the crossbeam lofting position; When the pier position line associated with the cross beam lofting position exceeds the lower edge line of the cross section of the box beam body and does not exceed the upper edge line of the cross section of the box beam body, the lower edge line is extended in a straight line in a first horizontal direction to a first position, and a closed area is determined as the longitudinal section of the cross beam at the cross beam lofting position according to the cross section of the box beam body and the extended lower edge line; When the pier position line associated with the crossbeam lofting position exceeds the upper edge line of the box girder main body cross section, the lower edge line is extended in a straight line toward the first horizontal direction to the first position, and the upper edge line is extended in a straight line toward the second horizontal direction to the second position, and a closed area is determined as the longitudinal section of the crossbeam at the crossbeam lofting position according to the box girder main body cross section, the extended lower edge line and the extended upper edge line.

11. The method according to claim 9, characterized in that The step of lofting the longitudinal section of the beam associated with each pier line to construct a three-dimensional model of the beam at each pier line includes: When the pier position line is a broken line pier position line, determining the number of second line segments of the broken line pier position line; According to the turning positions of the broken line pier position lines, each longitudinal cross section of the beam associated with the broken line pier position lines is divided into a plurality of plane sub-areas having the same number as the second line segments; Dividing the plane sub-areas associated with the same line segment of the broken line pier position line in all longitudinal sections of the beams associated with the broken line pier position line into one group; Each group of plane sub-areas is lofted to obtain the space area with the second number of line segments, and the space area with the second number of line segments is used as the three-dimensional model of the beam at the pier line with the broken line shape.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it is used to implement the three-dimensional modeling method of cast-in-place box girders described in any one of claims 1 to 11.

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