CN-121980663-A - Intelligent matching method for dimensional deviation of bridge prefabricated part based on BIM technology

CN121980663ACN 121980663 ACN121980663 ACN 121980663ACN-121980663-A

Abstract

The invention provides an intelligent matching method for dimension deviation of bridge prefabricated parts based on BIM technology, and relates to the technical field of intelligent matching, the method comprises the steps of obtaining a BIM design model of each prefabricated part, respectively indexing three identification nodes for each prefabricated part in the BIM design model, wherein the three identification nodes are respectively defined in a top centroid region, a bottom centroid region and a normal projection extremum region of a middle-section lateral profile surface of the corresponding prefabricated part; according to the assembly association topological relation of each prefabricated part and three identification nodes on each prefabricated part, respectively solving a first assembly base point and a second assembly base point in two adjacent prefabricated parts to be assembled, and determining a space positioning origin point. The invention can judge component deviation and intelligently adjust the geometric outline of the BIM model, realize the matching of dimensional deviation before the assembly of the bridge prefabricated component, improve the assembly efficiency and precision and reduce the on-site construction adjustment cost.

Inventors

MENG XINMING
LAI XIAOLI
CHANG PENGCHENG
DING KANG
LI XUEZHONG
YUAN PENG
MA XINWANG

Assignees

威海水利工程集团有限公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

1. The intelligent matching method for the dimensional deviation of the bridge prefabricated part based on the BIM technology is characterized by comprising the following steps: Step 1, acquiring a BIM design model of each prefabricated part, wherein in the BIM design model, three identification nodes are respectively marked for each prefabricated part, and the three identification nodes are respectively defined in a top centroid region, a bottom centroid region and a normal projection extremum region of a middle section lateral profile surface of the corresponding prefabricated part; Step 2, respectively solving a first assembly base point and a second assembly base point in two adjacent prefabricated components to be assembled according to the assembly association topological relation of each prefabricated component and three identification nodes on each prefabricated component, and determining a space positioning origin; Step 3, respectively constructing a first space envelope body and a second space envelope body according to a space positioning origin, performing space topological overlapping operation on the first space envelope body and the second space envelope body to obtain a space boundary curve of an overlapping domain; Step 4, calculating a coupling deviation metric value between the first assembly base point and the second assembly base point based on the first deviation vector set and the second deviation vector set; And 5, comparing the coupling deviation measurement value with a preset deviation tolerance threshold, and if the coupling deviation measurement value exceeds the deviation tolerance threshold, adjusting the space geometric profile of the prefabricated component in the BIM design model to realize intelligent matching of the dimensional deviation before assembly.
2. The intelligent matching method for dimensional deviations of bridge prefabricated parts based on the BIM technology according to claim 1, wherein the steps of respectively calculating a first assembly base point and a second assembly base point in two adjacent prefabricated parts to be assembled comprise: Acquiring space coordinate values of three identification nodes on a first prefabricated part of two adjacent prefabricated parts to be assembled in a BIM design model, extracting space coordinate values of the identification nodes defined by a normal projection extremum region of a lateral profile surface of a middle section of the first prefabricated part, combining a space transformation matrix corresponding to a theoretical installation pose of the first prefabricated part, converting the space coordinate values of the corresponding identification nodes into a global assembly coordinate system through the space transformation matrix, and resolving to obtain space coordinates of a first assembly base point; And acquiring space coordinate values of three identification nodes on a second prefabricated part in two adjacent prefabricated parts to be assembled in the BIM design model, extracting the space coordinate values of the identification nodes defined by the normal projection extremum region of the lateral profile surface of the middle section of the second prefabricated part, combining a space transformation matrix corresponding to the theoretical installation pose of the second prefabricated part, converting the space coordinate values of the corresponding identification nodes into a global assembly coordinate system through the space transformation matrix, and resolving to obtain the space coordinate of the second assembly base point.
3. The intelligent matching method for dimensional deviations of bridge prefabricated parts based on BIM technology according to claim 2, wherein the determining of the spatial positioning origin comprises: When the assembly coupling surfaces of two adjacent prefabricated components to be assembled are in a plane coupling configuration, determining a first assembly base point or a second assembly base point as a space positioning origin; When the assembly coupling surface is of a non-planar coupling configuration, taking a normal projection extremum area of a middle-section lateral profile surface of the prefabricated part where the first assembly base point is located as a first positioning center, taking 1/3 of the longest diagonal length of the external cuboid of the first prefabricated part in the BIM design model as a first calibration radius to construct a first closed loop line, taking a normal projection extremum area of a middle-section lateral profile surface of the prefabricated part where the second assembly base point is located as a second positioning center, and taking 1/3 of the longest diagonal length of the external cuboid of the second prefabricated part in the BIM design model as a second calibration radius to construct a second closed loop line; a geometric center point in an overlapping region of the first closed loop line and the second closed loop line is determined as a spatial location origin.
4. The intelligent matching method for dimensional deviations of bridge prefabricated parts based on BIM technology according to claim 3, wherein constructing a first space envelope and a second space envelope comprises: Taking a first assembly base point as a centroid of a first space envelope body, and taking 1/3 of the longest diagonal length of an external cuboid of a first prefabricated part in a BIM design model as an envelope radius of the first space envelope body to construct a first space envelope body in a sphere shape; And taking the second assembly base point as the centroid of the second space envelope body, and taking 1/3 of the longest diagonal length of the circumscribed cuboid of the second prefabricated part in the BIM design model as the envelope radius of the second space envelope body to construct the second space envelope body in a sphere shape.
5. The intelligent matching method for dimensional deviations of bridge prefabricated parts based on BIM technology according to claim 4, wherein the steps of performing a spatial topological overlap operation on the first spatial envelope and the second spatial envelope to obtain a spatial boundary curve of an overlap region comprise: performing space positioning on the first space envelope body and the second space envelope body under the same space coordinate system of the BIM design model to obtain a space distance value between a first assembly base point and a second assembly base point; Comparing the space distance value with the envelope radius of the first space envelope body and the envelope radius of the second space envelope body, and judging that the first space envelope body and the second space envelope body are in a space intersection state when the space distance value is smaller than the sum of the envelope radius of the first space envelope body and the envelope radius of the second space envelope body and is larger than the absolute value of the difference between the envelope radius of the first space envelope body and the envelope radius of the second space envelope body; And calculating the center coordinates and the radius of a space circle formed by intersecting the first space enveloping body and the second space enveloping body based on the space coordinates of the first assembly base point, the space coordinates of the second assembly base point, the enveloping radius of the first space enveloping body and the enveloping radius of the second space enveloping body, and determining the space circle as a space boundary curve of an overlapping domain.
6. The intelligent matching method for bridge prefabricated size deviation based on BIM technology according to claim 5, wherein extracting a plurality of discrete boundary feature nodes on a spatial boundary curve comprises: Extracting a plurality of discrete boundary feature nodes according to the space circle and the equal central angle interval, wherein the space coordinates of each boundary feature node are obtained by resolving based on the central coordinates of the space circle, the radius of the space circle and the corresponding central angle; Carrying out space vector mapping on each boundary feature node and a first assembly base point in sequence, calculating space vectors pointing to the boundary feature nodes from the first assembly base point, and collecting all the calculated space vectors into a first deviation vector set; and sequentially carrying out space vector mapping on the same boundary feature node and a second assembly base point, calculating space vectors pointing to the boundary feature node from the second assembly base point, and collecting all the calculated space vectors into a second deviation vector set.
7. The intelligent matching method for bridge prefabricated part size deviation based on BIM technology according to claim 6, wherein the method is characterized in that according to a space circle, a plurality of discrete boundary feature nodes are extracted according to equal central angle intervals, and the space coordinates of the boundary feature nodes are obtained by resolving based on the center coordinates of the space circle, the space circle radius and the corresponding central angle, and comprises the following steps: taking the space coordinate of the circle center of the space circle under the global assembly coordinate system as a reference circle center coordinate, and determining any radial direction in the plane of the space circle as an initial reference direction; Taking a reference center coordinate as a rotation center, taking an initial reference direction as an angle zero point, equally dividing the circumference of a space circle according to thirty degrees of center angle intervals to obtain twelve equally divided angle values, wherein each equally divided angle value is 30 degrees, 60 degrees and 90 degrees to 360 degrees respectively; and respectively taking the reference circle center coordinates as circle centers and the space circle radius as a distance, sequentially carrying out space vector synthesis on space direction vectors corresponding to the equal division angle values and the reference circle center coordinates, and calculating to obtain the space coordinates of twelve boundary feature nodes.
8. The intelligent matching method for dimensional deviations of bridge prefabricated parts based on BIM technology according to claim 7, wherein the step 4 comprises the following steps: pairing each first deviation vector in the first deviation vector set with a second deviation vector corresponding to the same boundary feature node in the second deviation vector set to obtain 12 deviation vector pairs; Taking the space angle of each boundary characteristic node on a space circle as a space coordinate parameter, respectively carrying out interpolation fitting on the modular length of each deviation vector in a first deviation vector set and a second deviation vector set along the space angle distribution of the space circle, and establishing a first deviation field function and a second deviation field function which are continuously distributed along the space angle; Performing difference operation on the first deviation field function and the second deviation field function to obtain deviation field difference functions which are continuously distributed along the space angle of the space circle; and carrying out weighted fusion on the integral operation result and a weight coefficient corresponding to the space angle of each boundary characteristic node on the space circle, and solving to obtain a coupling deviation measurement value between the first assembly base point and the second assembly base point.
9. The intelligent matching method for dimensional deviations of bridge prefabricated parts based on BIM technology according to claim 8, wherein the step 5 comprises: When the coupling deviation measurement value is smaller than or equal to a preset deviation tolerance threshold, determining that the dimensional deviation of the current two prefabricated components is within an acceptable range, and keeping the space geometric outline of the two prefabricated components in the BIM design model unchanged; When the coupling deviation metric value is larger than a preset deviation tolerance threshold value, judging that the size deviation of the current two prefabricated components exceeds an acceptable range, identifying a space angle domain interval with the largest deviation contribution according to the peak position of the deviation field difference function distributed along the space angle of the space circle, and generating a space geometric profile correction of the first prefabricated component or the second prefabricated component in the BIM design model according to the vector difference value of the first deviation vector and the second deviation vector corresponding to the space angle domain interval; and carrying out pre-adaptation adjustment on the space geometric profile of the corresponding prefabricated component in the BIM design model according to the space geometric profile correction amount so as to realize intelligent matching of the dimensional deviation before assembly.
10. The intelligent matching method for dimensional deviations of bridge prefabricated parts based on BIM technology according to claim 9, wherein the pre-adaptation adjustment comprises: Acquiring a space geometric profile correction, wherein the space geometric profile correction comprises a space angle value corresponding to a space angle domain interval with the largest deviation contribution, a vector difference value of a first deviation vector and a second deviation vector corresponding to the space angle domain interval, and a component value of the vector difference value along each coordinate axis under a global assembly coordinate system; positioning a contour region corresponding to a space angle value on a first prefabricated component or a second prefabricated component in a BIM design model by taking the space angle value in the space geometric contour correction quantity as a positioning parameter, and determining the contour region as a region to be corrected; Performing offset adjustment on the space geometric outline of the area to be corrected in a BIM design model according to the component values of the vector difference values along each coordinate axis under a global assembly coordinate system, wherein the direction of the offset adjustment is opposite to the direction of the vector difference values, and the amplitude of the offset adjustment is equal to the module length of the vector difference values; And after the offset adjustment is completed, re-extracting updated space coordinate values of the identification nodes corresponding to the areas to be corrected on the first prefabricated part or the second prefabricated part in the BIM design model, and storing the updated space coordinate values into a part attribute database of the BIM design model to serve as reference space coordinates of the corresponding prefabricated part in subsequent assembly matching calculation.

Description

Intelligent matching method for dimensional deviation of bridge prefabricated part based on BIM technology Technical Field The invention relates to the technical field of intelligent matching, in particular to an intelligent matching method for dimensional deviation of a bridge prefabricated part based on a BIM technology. Background In the assembly process of the existing bridge prefabricated part, the control of the dimensional deviation is usually focused on the independent detection before delivery or the trial assembly adjustment during field installation, and the common means is that the key parts of the part are subjected to single-point measurement by means of a total station or a laser scanner in a prefabricated factory, and the measurement result is compared with a design value to judge whether the machining precision of the part meets the requirement. However, there is still some room for improvement in practical applications. Taking the assembly of the prefabricated pier stud and the capping beam as an example, the prior art usually focuses more on the local geometric dimension of the end connection region of the component, such as end flatness or center point deviation, but in practical engineering, during the processing, storage and transportation of the prefabricated component, the lateral profile of a section of the prefabricated component may generate certain deformation due to the shrinkage difference of concrete or slight collision, and such deformation may still be within a single dimensional tolerance range when a single component is detected, but when two components are spatially aligned and assembled, the slight deviation of the non-connection region may be transmitted through the spatial attitude of the component, so that the nonlinear coupling deviation occurs in the practical installation of the preset assembly base point (such as the component centroid axis) in design. At present, an auxiliary method for carrying out integral envelope matching on a plurality of prefabricated components in a virtual space and comprehensively quantifying assembly deviation from a multi-dimensional identification node is not available, so that the problem of assembly interference or uneven gaps possibly caused by profile deviation of the middle section of the components is difficult to fully predict before hoisting, temporary trimming or adjusting measures are needed to be relied on in situ, and certain influence is possibly brought to assembly efficiency and structural stress performance. Disclosure of Invention The invention provides an intelligent matching method for the dimensional deviation of a bridge prefabricated part based on a BIM technology, which can comprehensively reflect the whole dimensional deviation of the part and effectively avoid deviation missed judgment caused by local detection. In order to solve the technical problems, the technical scheme of the invention is as follows: the intelligent matching method for the dimensional deviation of the bridge prefabricated part based on the BIM technology comprises the following steps: Step 1, acquiring a BIM design model of each prefabricated part, wherein in the BIM design model, three identification nodes are respectively marked for each prefabricated part, and the three identification nodes are respectively defined in a top centroid region, a bottom centroid region and a normal projection extremum region of a middle section lateral profile surface of the corresponding prefabricated part; Step 2, respectively solving a first assembly base point and a second assembly base point in two adjacent prefabricated components to be assembled according to the assembly association topological relation of each prefabricated component and three identification nodes on each prefabricated component, and determining a space positioning origin; Step 3, respectively constructing a first space envelope body and a second space envelope body according to a space positioning origin, performing space topological overlapping operation on the first space envelope body and the second space envelope body to obtain a space boundary curve of an overlapping domain; Step 4, calculating a coupling deviation metric value between the first assembly base point and the second assembly base point based on the first deviation vector set and the second deviation vector set; And 5, comparing the coupling deviation measurement value with a preset deviation tolerance threshold, and if the coupling deviation measurement value exceeds the deviation tolerance threshold, adjusting the space geometric profile of the prefabricated component in the BIM design model to realize intelligent matching of the dimensional deviation before assembly. The scheme of the invention at least comprises the following beneficial effects: the invention sets the identification nodes in the top centroid, the bottom centroid and the middle lateral profile extremum area of the prefabricated component, real