A cad-based short-line method segment precast visualization control method

Abstract

The application discloses a kind of short line method segment prefabrication visual control methods based on CAD, method includes reading and analyzing the design data table of segment prefabricated beam by CAD, the overall coordinate data of all segment blocks is generated, the overall coordinate data of adjacent two segment blocks is extracted, the coordinate conversion between overall coordinate system and local coordinate system is carried out to the overall coordinate data of two segment blocks, the target coordinate data of first segment block is obtained, carry out angle error calculation analysis and theoretical position correction, obtain the target coordinate data of second segment block;Overall coordinate data and target coordinate data are respectively carried out visual analysis, and the design form and actual space form of current second segment block are obtained, and the overall coordinate data of different positions adjacent two segment blocks is continuously carried out visual calculation, and the visual result of all segment blocks is obtained.The embodiment realizes the visual control of segment prefabricated beam, improves the efficiency and precision of short line method segment prefabrication.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of short-line method segment prefabrication, in particular to a CAD-based short-line method segment prefabrication visualization control method. BACKGROUND

[0002] Segment prefabrication method first appeared in Europe in the 1960s, and achieved good economic and aesthetic effect. The method has been popularized worldwide. Segment prefabrication method has the advantages of light segment weight, small size, convenient transportation, good line adaptability, and large selection range of prefabricated beam field. The method has been more and more widely used in domestic bridge construction. Short-line method segment prefabrication has short construction period, occupies less site, and has high segment production quality. Short-line method segment prefabrication requires high construction precision and configuration of key geometric control technology in the prefabrication and assembly stages. However, there is a lack of effective control method in actual engineering using short-line method segment prefabrication, and it is difficult to master the technology. There is also no related research on short-line method segment prefabrication linear control method based on CAD development.

[0003] Currently, short-line method segment prefabrication control technology is usually based on six measurement control point coordinate value data files, and does not involve visualization segment beam actual contour graphic files corresponding to the coordinate data. The segment beam prefabrication deviation cannot be intuitively displayed synchronously with the data. At the same time, the current domestic short-line method segment prefabrication control has not tried to use the CAD coordinate conversion function and drawing function to solve the problem. Most of them are based on numerical operation, planning solution and matrix solution. The solving process is complex, the calculation value error is large, and the accuracy is not high. SUMMARY

[0004] The present application provides a CAD-based short-line method segment prefabrication visualization control method, which realizes the visualization of the design and actual spatial form of the segment prefabrication beam, avoids the influence of error value, and improves the efficiency and precision of short-line method segment prefabrication.

[0005] To solve the above technical problems, the present application provides a CAD-based short-line method segment prefabrication visualization control method, comprising:

[0006] The design data table of the segment prefabrication beam is read and analyzed by CAD to generate the overall coordinate data of all segment blocks in the segment prefabrication beam, and the overall coordinate data of two adjacent segment blocks is extracted; wherein the two adjacent segment blocks are a first segment block and a second segment block, and the first segment block is used as a movable end mold to match the second segment block for construction.

[0007] The overall coordinate data of the first segment block and the second segment block are converted between the overall coordinate system and the local coordinate system to obtain the target coordinate data of the first segment block.

[0008] Obtaining the coordinate measurement data of the first segment block, performing angular error calculation and analysis on the target coordinate data and the coordinate measurement data of the first segment block, obtaining the prefabrication error data of the first segment block, and correcting the overall coordinate data of the second segment block according to the prefabrication error data of the first segment block to obtain the target coordinate data of the second segment block;

[0009] Performing visual analysis on the overall coordinate data and the target coordinate data of the second segment block respectively to obtain the design shape and the actual space shape of the second segment block in the segment prefabricated beam.

[0010] According to the embodiment of the present application, the design data table of the segment prefabricated beam is read and analyzed by CAD, the overall coordinate data of all segments in the segment prefabricated beam is generated, the overall coordinate system and the local coordinate system are converted through the overall coordinate data of the last segment (the first segment block) and the current segment (the second segment block) through the secondary development of CAD, the target coordinate data of the first segment block is obtained, the coordinate conversion between the overall coordinate system and the local coordinate system required by the short-line method segment prefabricated beam is quickly realized, the calculation accuracy of other traditional solving formulas and the solving process are avoided, the coordinate conversion and calculation accuracy are fully guaranteed, and the efficiency of visual control is improved. The target coordinate data and the coordinate measurement data of the first segment block are subjected to angular error calculation and analysis, the prefabrication error data of the first segment block is obtained, the overall coordinate data of the second segment block is corrected according to the prefabrication error data of the first segment block to obtain the target coordinate data of the second segment block, the segment beam prefabrication error calculation is realized, the actual space coordinates of the segment beam are automatically corrected according to the error value, the purpose of automatic correction of the next segment block is achieved, and the influence of the error value is avoided. The overall coordinate data and the target coordinate data of the second segment block are subjected to visual analysis respectively, the design shape and the actual space shape of the second segment block prefabricated beam are obtained respectively, the design contour and the actual contour of the segment beam are automatically drawn through the CAD drawing function, visual error analysis is facilitated, and the control accuracy of the short-line method segment prefabrication is improved.

[0011] As a preferred scheme, the design data table of the segment prefabricated beam is read and analyzed by CAD, the overall coordinate data of all segment blocks in the segment prefabricated beam is generated, and the overall coordinate data of two adjacent segment blocks is extracted, specifically:

[0012] The design data table of the segment prefabricated beam is read by CAD; wherein the design data table includes the design mileage value of each segment joint and the design camber value of the position of each segment joint;

[0013] According to the design data table, the coordinate values of the intersection points of the front and rear segment joints and the beam axis of each segment are calculated by distance coordinates to obtain the axis intersection coordinate values of each segment;

[0014] According to the axis intersection coordinate value, the intersection of the two sides of the web of the segment on the axis of the segment is calculated in the normal direction of the intersection line of the axis, and the intersection coordinate value of the two sides of the web of each segment is obtained.

[0015] According to the axis intersection coordinate value and the intersection coordinate value of the two sides of the web of each segment, the overall coordinate data of all segment blocks in the segment precast beam is generated.

[0016] The overall coordinate data of the adjacent two segment blocks is extracted to obtain the overall coordinate data of the first segment block and the second segment block in the segment precast beam; wherein the overall coordinate data of the first segment block includes the first coordinate value, the second coordinate value, the third coordinate value, the fourth coordinate value, the fifth coordinate value and the sixth coordinate value; the overall coordinate data of the second segment block includes the seventh coordinate value, the eighth coordinate value, the ninth coordinate value, the tenth coordinate value, the eleventh coordinate value and the twelfth coordinate value.

[0017] The embodiment of the present application efficiently and accurately generates the segment beam theoretical six-point coordinate data file, i.e. the overall coordinate data of the segment, which is convenient for providing accurate data information for the segment precast beam construction monitoring unit.

[0018] As a preferred scheme, the overall coordinate data of the first segment block and the second segment block is converted between the overall coordinate system and the local coordinate system to obtain the target coordinate data of the first segment block, specifically:

[0019] The overall coordinate data of the first segment block and the second segment block is read by CAD, and the overall coordinate data is taken as the coordinate value in the overall coordinate system;

[0020] According to the overall coordinate data of the first segment block, a first local coordinate system is established, and the embedded measurement point actual measurement data of the first segment block is converted by coordinate conversion in the first local coordinate system to obtain the embedded measurement point overall coordinate value in the overall coordinate system;

[0021] According to the overall coordinate data of the second segment block, a second local coordinate system is established, and the embedded measurement point overall coordinate value is converted by coordinate conversion in the second local coordinate system to obtain the target coordinate data of the first segment block.

[0022] The embodiment of the present application utilizes the world coordinate system and the local coordinate system of CAD, and realizes the coordinate conversion between the overall coordinate system and the local coordinate system required by the short line method segment precast beam through CAD secondary development, which avoids the problems of low calculation accuracy and complex solving process of other methods such as planning solving and matrix formula solving, and fully guarantees the calculation efficiency and calculation accuracy of coordinate conversion.

[0023] As a preferred solution, according to the overall coordinate data of the first segment block, a first local coordinate system is established, and the embedded measurement point actual measurement data of the first segment block is converted and transformed in the first local coordinate system to obtain the overall coordinate value of the embedded measurement point in the overall coordinate system, specifically:

[0024] A coordinate system is established in CAD, taking the fifth coordinate value as the base point, establishing the X axis in the direction from the fifth coordinate value to the second coordinate value, establishing the Y axis in the direction from the fifth coordinate value to the fourth coordinate value, and establishing the XOY normal upward direction as the Z axis, to obtain the first local coordinate system;

[0025] The axis and elevation measurement points embedded before the initial setting of the concrete of the first segment block are read through CAD to obtain the local coordinate value of the embedded measurement point;

[0026] The local coordinate value of the embedded measurement point is substituted into the first local coordinate system through CAD, and the local coordinate value of the embedded measurement point is converted and transformed to obtain the overall coordinate value of the embedded measurement point in the overall coordinate system.

[0027] As a preferred solution, according to the overall coordinate data of the second segment block, a second local coordinate system is established, and the overall coordinate value of the embedded measurement point is converted and transformed in the second local coordinate system to obtain the target coordinate data of the first segment block, specifically:

[0028] A coordinate system is established in CAD, taking the eleventh coordinate value as the base point, establishing the X axis in the direction from the eleventh coordinate value to the eighth coordinate value, establishing the Y axis in the direction from the eleventh coordinate value to the tenth coordinate value, and establishing the XOY normal upward direction as the Z axis, to obtain the second local coordinate system;

[0029] The overall coordinate value of the embedded measurement point is substituted into the second local coordinate system through CAD, and the overall coordinate value of the embedded measurement point is converted and transformed to obtain the target coordinate data of the first segment block; wherein the target coordinate data includes the thirteenth coordinate value, the fourteenth coordinate value, the fifteenth coordinate value, the sixteenth coordinate value, the seventeenth coordinate value and the eighteenth coordinate value.

[0030] As a preferred solution, the coordinate measurement data of the first segment block is obtained, the target coordinate data and the coordinate measurement data of the first segment block are calculated and analyzed for angle error, and the prefabrication error data of the first segment block is obtained, specifically:

[0031] According to the six-point coordinate measurement values collected in the matching position of the first segment block in the beam field, the coordinate measurement data of the first segment block is obtained; wherein the coordinate measurement data includes the nineteenth coordinate value, the twentieth coordinate value, the twenty-first coordinate value, the twenty-second coordinate value, the twenty-third coordinate value and the twenty-fourth coordinate value;

[0032] The coordinate measurement data and the target coordinate data are subjected to plane distance operation to obtain an axis length error value and an axis plane angle error value;

[0033] The thirteenth coordinate value, the fifteenth coordinate value, the sixteenth coordinate value and the eighteenth coordinate value are subjected to straight line angle operation to obtain a first facade angle value;

[0034] The nineteenth coordinate value, the twenty-first coordinate value, the twenty-second coordinate value and the twenty-fourth coordinate value are subjected to straight line angle operation to obtain a second facade angle value;

[0035] The first facade angle value and the second facade angle value are subjected to numerical operation to obtain a facade angle error value;

[0036] The axis length error value, the axis plane angle error value and the facade angle error value are used to obtain prefabrication error data of the first segment block.

[0037] According to the embodiment of the application, segment beam prefabrication error calculation is performed, the actual contour of the segment beam can be automatically drawn through CAD drawing function, visual error analysis is facilitated, and the actual spatial coordinates of the segment beam can be automatically corrected according to the error value, so that the next segment block prefabrication automatic deviation correction is achieved.

[0038] As a preferred scheme, the coordinate measurement data and the target coordinate data are subjected to plane distance operation to obtain an axis length error value and an axis plane angle error value, specifically as follows:

[0039] The fourteenth coordinate value and the seventeenth coordinate value are subjected to two-point distance calculation and straight line angle operation to obtain a theoretical beam length value and a first axis plane angle value;

[0040] The twentieth coordinate value and the twenty-third coordinate value are subjected to two-point distance calculation and straight line angle operation to obtain an actual beam length value and a second axis plane angle value;

[0041] The theoretical beam length value and the actual beam length value are subjected to numerical operation to obtain an axis length error value;

[0042] The first axis plane angle value and the second axis plane angle value are subjected to numerical operation to obtain an axis plane angle error value.

[0043] As a preferred scheme, the overall coordinate data of the second segment block is subjected to theoretical position correction according to the prefabrication error data of the first segment block to obtain target coordinate data of the second segment block, specifically as follows:

[0044] The second segment block is subjected to rotation correction on the plane with the axis plane angle error value as a rotation angle, and is subjected to rotation correction on the facade with the facade angle error value as a rotation angle;

[0045] According to the current theoretical position of the second segment block after rotation, target coordinate data of the second segment block is obtained.

[0046] As a preferred solution, the overall coordinate data and the target coordinate data of the second segment block are respectively subjected to visual analysis to obtain the design form and the actual spatial form of the second segment block in the segmental precast beam, specifically:

[0047] According to the parameters of the segmental precast beam, the overall coordinate data of the second segment block is drawn in CAD to obtain the design form of the second segment block in the segmental precast beam;

[0048] The second segment block and the target coordinate data are subjected to revit modeling to obtain a three-dimensional BIM model of the actual spatial form of the second segment block in the segmental precast beam.

[0049] By the overall coordinate data of the second segment block, i.e., the theoretical six-point coordinates of the segment joint, the theoretical line form (design form) is determined, and the target coordinate data after error analysis and correction of the segment joint is determined. The actual line form (actual spatial form) of the segment is determined. The projection contour of the segment on the plane and the development contour on the longitudinal section can be automatically drawn by CAD secondary development and program, and different colored lines can be used for differentiation to draw the design form of the segmental precast beam, directly observe the small difference (error value can be directly obtained by measurement) between the theoretical contour and the actual contour of the segment block, and judge the direction and accuracy of the correction to avoid the possibility of large error.

[0050] As a preferred solution, after the overall coordinate data and the target coordinate data of the second segment block are respectively subjected to visual analysis to obtain the design form and the actual spatial form of the second segment block in the segmental precast beam, the method further comprises:

[0051] The overall coordinate data of the adjacent two segment blocks at different positions are continuously subjected to coordinate conversion between the overall coordinate system and the local coordinate system, error calculation analysis and theoretical position correction to obtain the design form and the actual spatial form of all segment blocks of the segmental precast beam. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 : a flowchart of an embodiment of a short-line method segment precast visual control method based on CAD provided by the present application;

[0053] Figure 2: The segment axis intersection coordinate data result graph of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0054] Figure 3 : The six point position graph on the front and rear end surfaces of the segment beam of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0055] Figure 4 : The overall coordinate position graph of two adjacent segment blocks of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0056] Figure 5 : The first local coordinate system graph of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0057] Figure 6 : The embedded measurement point local coordinate value result graph of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0058] Figure 7 : The arrangement graph of the six measurement points of the n# block and the n-1# block on the segment beam of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0059] Figure 8 : The second local coordinate system graph of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0060] Figure 9 : The target coordinate data result graph of the n-1# block of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0061] Figure 10 : The n-1# block axis plane deflection angle error graph of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0062] Figure 11 : The n-1# block error analysis output result graph of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0063] Figure 12 : The error correction schematic graph of an embodiment of the segment prefabrication visualization control method based on the short line method provided by the present application;

[0064] Figure 13: A segmental beam plane design contour drawing of an embodiment of the CAD-based short-line method segment precast visualization control method provided by the present application is drawn;

[0065] Figure 14 : A segmental beam elevation design contour drawing of an embodiment of the CAD-based short-line method segment precast visualization control method provided by the present application is drawn;

[0066] Figure 15 : An actual space form and design form comparison result drawing of an embodiment of the CAD-based short-line method segment precast visualization control method provided by the present application is drawn;

[0067] Figure 16 : A segmental beam BIM three-dimensional model drawing of an embodiment of the CAD-based short-line method segment precast visualization control method provided by the present application is drawn. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0069] Embodiment one

[0070] Please refer to Figure 1 A flowchart of a CAD-based short-line method segment precast visualization control method provided by an embodiment of the present application is shown. The visualization control method of the present embodiment is applicable to short-line method segment precast linear control based on CAD development. The present embodiment automatically controls the visualization of the design and actual space form of segment precast beams through comprehensive calculation of segment block coordinate data, avoids the influence of error values, and improves the efficiency and precision of short-line method segment precast. The visualization control method includes steps 101 to 105, and each step is specifically as follows:

[0071] Step 101: The design data table of segment precast beams is read and analyzed by CAD, the overall coordinate data of all segment blocks in the segment precast beams is generated, and the overall coordinate data of two adjacent segment blocks is extracted; wherein the two adjacent segment blocks are a first segment block and a second segment block, and the first segment block is used as a movable end mold to match the second segment block for construction.

[0072] In the embodiment, due to long line, bridge span combination of various types, the coordinate calculation of the segment joint position is time-consuming and laborious. By directly reading and analyzing the line horizontal curve and vertical curve elements of CAD, the design mileage value of each segment joint is read, and the overall coordinate data file of all segment joints can be quickly and batch generated. By batch and quickly outputting the overall coordinate data file of each segment joint of the bridge under the actual space line, the segment beam design line can be directly drawn.

[0073] Optionally, the step 101 specifically includes steps 1011 to 1015, and each step specifically includes the following steps:

[0074] Step 1011: reading the design data table of the segment precast beam by CAD; wherein the design data table includes the design mileage value of each segment joint and the design camber of the position of each segment joint.

[0075] In the embodiment, the design data table of the segment precast beam is read by the secondary development of CAD, and the data contained in the data table includes the design mileage value LCi of each segment joint, the design camber YGDi of the position of each segment joint, etc.

[0076] Step 1012: according to the design data table, the coordinate value of the intersection position of the front and rear segment joints and the beam axis of each segment is calculated by distance coordinate, and the axis intersection coordinate value of each segment is obtained.

[0077] In the embodiment, the line horizontal curve and the line vertical curve are selected in CAD, and the design mileage value LCi of each segment joint and the design camber YGDi of the position of each segment joint are obtained by the secondary development of CAD. The coordinate value PMi and PMj of the intersection position of the front and rear segment joints and the beam axis of each segment, i.e. the axis intersection coordinate value of each segment, can be quickly obtained by referring to the distance coordinate function (vlax-curve-getPointAtdist) provided by Visual Lisp, and the axis intersection coordinate data result of the segment is as shown in the following table. Figure 2

[0078] Step 1013: according to the axis intersection coordinate value, the intersection point of the web on the axis on the normal direction of the connection line of the axis intersection is calculated, and the web intersection coordinate value of each segment is obtained.

[0079] In the embodiment, according to the axis intersection coordinate value PMi and PMj, the coordinate value of the point PLi, PRi, PLj and PRj on the left and right webs on the axis on the normal direction of the connection line of PMi and PMj, i.e. the web intersection coordinate value of each segment, is quickly generated by CAD.

[0080] ​Step 1014: generating the overall coordinate data of all segment blocks in the segment precast beam according to the axis intersection coordinate values of each segment and the two-side web intersection coordinate values.

[0081] In the embodiment, according to the axis intersection coordinate values PMi, PMj and the two-side web intersection coordinate values PLi, PRi, PLj, PRj of each segment, the positions of the six points on the front and rear end faces of the segment beam are formed into a segment beam theoretical six-point coordinate database, i.e., the overall coordinate data of each segment block. Figure 3

[0082] Step 1015: extracting the overall coordinate data of the adjacent two segment blocks to obtain the overall coordinate data of the first segment block and the second segment block in the segment precast beam; wherein the overall coordinate data of the first segment block includes a first coordinate value, a second coordinate value, a third coordinate value, a fourth coordinate value, a fifth coordinate value and a sixth coordinate value; and the overall coordinate data of the second segment block includes a seventh coordinate value, an eighth coordinate value, a ninth coordinate value, a tenth coordinate value, an eleventh coordinate value and a twelfth coordinate value.

[0083] In the embodiment, the overall coordinate data of the six points (PL1i, PM1i, PR1i, PL1j, PM1j, PR1j) of the front and rear segment joints of any n-1# block (the first segment block) is extracted, the six-point coordinates of the first segment block correspond to the first coordinate value, the second coordinate value, the third coordinate value, the fourth coordinate value, the fifth coordinate value and the sixth coordinate value of the overall coordinate data of the first segment block, respectively; the overall coordinate data of the six points (PL2i, PM2i, PR2i, PL2j, PM2j, PR2j) of the front and rear segment joints of any n# block (the second segment block) is extracted, the six-point coordinates of the second segment block correspond to the seventh coordinate value, the eighth coordinate value, the ninth coordinate value, the tenth coordinate value, the eleventh coordinate value and the twelfth coordinate value of the overall coordinate data of the second segment block, respectively. The overall coordinate positions of the adjacent two segment blocks are shown in FIG. 8, i.e., the positions of the six points on the front and rear end faces of any two adjacent segment blocks. The coordinate values of the cast segment (n-1# block-the first segment block) in the matching position facilitate positioning the position of the matching segment, and serve as the active end mold for matching the next segment (n# block-the second segment block) for construction. Figure 4

[0084] By implementing the embodiment of the present application, the segment beam theoretical six-point coordinate data file, i.e., the overall coordinate data of the segment, is efficiently and accurately generated, which facilitates providing accurate data materials for the segment precast beam construction monitoring unit.

[0085] Step 102: performing coordinate conversion between the overall coordinate system and the local coordinate system on the overall coordinate data of the first segment block and the second segment block to obtain the target coordinate data of the first segment block.

[0086] ​​It should be noted that in the process of coordinate system conversion, any small error will reduce the beam segment prefabrication accuracy, and in severe cases, the prefabricated beam segment cannot be used and can only be scrapped. Therefore, attention must be paid to the accuracy of coordinate transformation during coordinate transformation.

[0087] In this embodiment, two segment blocks involve multiple coordinate conversions between the global coordinate system and the local coordinate system. Through the world coordinate system and user coordinate system conversion function of AutoCAD, the coordinate conversion between the global coordinate and the local coordinate system can be easily realized, and high accuracy of coordinate conversion can be achieved.

[0088] Optionally, step 102 specifically includes steps 1021 to 1023, each of which is specifically as follows:

[0089] Step 1021: Read the global coordinate data of the first segment block and the second segment block through CAD, and use the global coordinate data as the coordinate value in the global coordinate system.

[0090] In this embodiment, the global coordinate data file of the actual space line of the provided cast segment block n-1# block (first segment block) is read by CAD to obtain the global coordinate data of the six points (PL1i, PM1i, PR1i, PL1j, PM1j, PR1j) of the front and rear segment joints of the n-1# block (first segment block).

[0091] Step 1022: According to the global coordinate data of the first segment block, a first local coordinate system is established, and the measured data of the embedded measuring points of the first segment block is converted and transformed in the global coordinate system to obtain the global coordinate value of the embedded measuring points.

[0092] Optionally, step 1022 is specifically: in CAD, a coordinate system is established with the fifth coordinate value as the base point, the direction from the fifth coordinate value to the second coordinate value as the X axis, and the direction from the fifth coordinate value to the fourth coordinate value as the Y axis, the normal direction of XOY as the Z axis, to obtain the first local coordinate system; the axis and elevation measuring points embedded in the first segment block before the concrete initial setting are read by CAD to obtain the local coordinate value of the embedded measuring points; the local coordinate value of the embedded measuring points is substituted into the first local coordinate system by CAD, and the local coordinate value of the embedded measuring points is converted and transformed to obtain the global coordinate value of the embedded measuring points in the global coordinate system.

[0093] In this embodiment, by sewing three points (PM1j, PM1i, PL1j) onto the front and back of block n-1# (the first segment block), the overall coordinates can be used to establish a local coordinate system on CAD. This system has PM1j as the base point O, PM1j, PM1i, and PL1j corresponding to the fifth, second, and fourth coordinate values, respectively. The X-axis is the direction from PM1j to PM1i, the Y-axis is the direction from PM1j to PL1j, and the Z-axis is the upward direction of the XOY normal. This is the first local coordinate system. Figure 5 As shown. Then, read the coordinate values ​​of six points (AL1i, AM1i, AR1i, AL1j, AM1j, AR1j) of the axis and elevation measurement points embedded in block n-1# (the first segment block) before the initial setting of the concrete. This yields the local coordinate values ​​of the embedded measurement points. The results of the local coordinate values ​​of the embedded measurement points are as follows: Figure 6 As shown, the arrangement of the six measuring points of blocks n# and n-1# on the segmental beam is as follows: Figure 7 As shown. Then, substitute the coordinate values ​​of the six measurement points (AL1i, AM1i, AR1i, AL1j, AM1j, AR1j) of the obtained n-1# block (the first segment block) into the established first local coordinate system. Through the local coordinate system to global coordinate system conversion function of CAD, it can be converted into the coordinate values ​​of the six measurement points in the global coordinate system (BL1i, BM1i, BR1i, BL1j, BM1j, BR1j), that is, the overall coordinate values ​​of the pre-embedded measurement points.

[0094] Step 1023: Based on the overall coordinate data of the second segment block, establish a second local coordinate system, and under the second local coordinate system, transform the overall coordinate values ​​of the pre-embedded measurement points to obtain the target coordinate data of the first segment block.

[0095] Optionally, step 1023 specifically involves: establishing a coordinate system in CAD with the eleventh coordinate value as the base point, an X-axis in the direction from the eleventh coordinate value to the eighth coordinate value, a Y-axis in the direction from the eleventh coordinate value to the tenth coordinate value, and the Z-axis in the upward direction of the XOY normal, thus obtaining a second local coordinate system; substituting the overall coordinate values ​​of the pre-embedded measurement points into the second local coordinate system through CAD, and performing coordinate transformation on the overall coordinate values ​​of the pre-embedded measurement points to obtain the target coordinate data of the first segment block; wherein, the target coordinate data includes the thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth coordinate values.

[0096] In the embodiment, the segment block n# block (the second segment block) to be poured read by CAD obtains the overall coordinate data of the six points (PL2i, PM2i, PR2i, PL2j, PM2j, PR2j) of the segment joints before and after the n# block (the second segment block), and establishes a second local coordinate system with the point PM2j as the base point, the direction from the point PM2j to the point PM2i as the X axis, the direction from the point PM2j to the point PL2j as the Y axis, and the upward direction of the XOY normal line as the Z axis, by the overall coordinates of three points (11PM2j, 8PM2i, 10PL2j) of the segment joints before and after the n# block (the second segment block), and the thirteenth coordinate value, the eighth coordinate value and the tenth coordinate value correspond to the points PM2j, PM2i and PL2j respectively, as shown in Figure 8 The overall coordinate values of the six embedded measuring points (BL1i, BM1i, BR1i, BL1j, BM1j, BR1j) of the n-1# block (the first segment block) are substituted into the second local coordinate system, and the coordinate values (CL1i, CM1i, CR1i, CL1j, CM1j, CR1j) of the six measuring points of the n-1# block (the first segment block) in the second local coordinate system are converted by the overall coordinate system and the local coordinate system conversion function of CAD, to generate the control measurement values required for the n-1# block (the first segment block) to move to the target position, that is, the target coordinate data of the n-1# block, as shown in Figure 9 The thirteenth coordinate value, the fourteenth coordinate value, the fifteenth coordinate value, the sixteenth coordinate value, the seventeenth coordinate value and the eighteenth coordinate value correspond to CL1i, CM1i, CR1i, CL1j, CM1j and CR1j respectively.

[0097] The embodiment of the application utilizes the world coordinate system and the local coordinate system of CAD, and realizes the coordinate conversion between the overall coordinate system and the local coordinate system required by the short-line method segment precast beam through the secondary development of CAD, avoids the problems such as low calculation accuracy and complex solving process of other methods such as planning solving and matrix solving formula, and fully guarantees the calculation efficiency and calculation accuracy of coordinate conversion.

[0098] Step 103: Obtain the coordinate measurement data of the first segment block, perform the deflection error calculation and analysis on the target coordinate data and the coordinate measurement data of the first segment block, obtain the precast error data of the first segment block, and perform the theoretical position correction on the overall coordinate data of the second segment block according to the precast error data of the first segment block, to obtain the target coordinate data of the second segment block.

[0099] It should be noted that, in the prefabrication process of the segmental beam, due to the influence of measurement errors, construction disturbances, formwork precision, beam field temperature and humidity, it is inevitable to produce prefabrication errors. If the error is too large or accumulates, it will have a great impact on the assembly linearity of the segmental beam. Error control and correction are the key to the successful implementation of the short-line method segment prefabrication.

[0100] In this embodiment, the method analyzes and calculates the beam length error, plane angle error and vertical plane angle error according to the six-point coordinate data measured on site through CAD secondary development, and continuously corrects the segmental beam theoretical six-point coordinate database provided in step 1014 through direct correction or segmented correction, so that the final prefabricated linearity is located at the design linearity.

[0101] Optionally, the coordinate measurement data of the first segment block is obtained, target coordinate data and coordinate measurement data of the first segment block are subjected to angle error calculation and analysis, and prefabrication error data of the first segment block is obtained, specifically including S1-S6, and specifically as follows:

[0102] S1: Obtain the coordinate measurement data of the first segment block according to the six-point coordinate measurement values of the first segment block collected at the matching position in the beam field; wherein the coordinate measurement data includes the nineteenth coordinate value, the twentieth coordinate value, the twenty-first coordinate value, the twenty-second coordinate value, the twenty-third coordinate value and the twenty-fourth coordinate value;

[0103] In this embodiment, the target coordinate data values (CL1i, CM1i, CR1i, CL1j, CM1j, CR1j) of the poured segment n-1# block (first segment block) at the matching position obtained by step 1023 through coordinate conversion are read by secondary development CAD, and the six-point coordinate measurement values (DL1i, DM1i, DR1i, DL1j, DM1j, DR1j) of the n-1# block (first segment block) at the matching position in the beam field are collected by secondary development CAD. DL1i, DM1i, DR1i, DL1j, DM1j and DR1j correspond to the nineteenth coordinate value, the twentieth coordinate value, the twenty-first coordinate value, the twenty-second coordinate value, the twenty-third coordinate value and the twenty-fourth coordinate value respectively.

[0104] S2: Perform plane distance operation on the coordinate measurement data and the target coordinate data to obtain the axis length error value and the axis plane angle error value;

[0105] Optionally, S2 includes S21-S24 and is specifically as follows:

[0106] S21: Perform two-point distance calculation and straight line angle operation on the fourteenth coordinate value and the seventeenth coordinate value to obtain the theoretical beam length value and the first axis plane angle value;

[0107] In this embodiment, according to the coordinates (CM1i, CM1j) obtained in S1, i.e. the fourteenth coordinate value and the seventeenth coordinate value, the theoretical beam length value L between the measuring points CM1i, CM1j on the two axes of the n-1# block (first segment block) can be obtained by distance calculation between two points and straight line deflection angle calculation. ll and the first axis plane deflection angle θp ll .

[0108] S22: The twentieth coordinate value and the twenty-third coordinate value are subjected to distance calculation between two points and straight line deflection angle calculation to obtain the actual beam length value and the second axis plane deflection angle value.

[0109] In this embodiment, according to the coordinates (DM1i, DM1j) obtained in S1, i.e. the twentieth coordinate value and the twenty-third coordinate value, the actual beam length value L between the measuring points DM1i, DM1j on the two axes of the n-1# block can be obtained by distance calculation between two points and straight line deflection angle calculation. sc and the second axis plane deflection angle θp sc .

[0110] S23: The theoretical beam length value and the actual beam length value are subjected to numerical calculation to obtain the axis length error value.

[0111] In this embodiment, according to the theoretical beam length value L ll and the theoretical beam length value L sc , the axis length error ΔL = L sc - L ll of the n-1# block (first segment block) can be obtained.

[0112] S24: The first axis plane deflection angle value and the second axis plane deflection angle value are subjected to numerical calculation to obtain the axis plane deflection angle error value.

[0113] In this embodiment, according to the first axis plane deflection angle value θp ll and the second axis plane deflection angle value θp sc , the axis plane deflection angle error Δθp = θp sc - θp ll of the n-1# block can be obtained, as shown in Figure 10 .

[0114] S3: The thirteenth coordinate value, the fifteenth coordinate value, the sixteenth coordinate value and the eighteenth coordinate value are subjected to straight line deflection angle calculation to obtain the first facade deflection angle value.

[0115] In the embodiment, according to the coordinates (CL1i, CL1j, CR1i, CR1j) obtained in S1, i.e. the thirteenth coordinate value, the fifteenth coordinate value, the sixteenth coordinate value and the eighteenth coordinate value, the first theoretical elevation angle θL between the elevation measuring points CL1i, CL1j, CR1i, CR1j of the n-1# block (the first segment block) can be obtained by calculating the distance between two points and the formula for calculating the angle of a straight line. ll .

[0116] S4: the nineteenth coordinate value, the twenty-first coordinate value, the twenty-second coordinate value and the twenty-fourth coordinate value are subjected to straight line angle operation to obtain a second elevation angle value;

[0117] In the embodiment, according to the coordinates (DL1i, DL1j, DR1i, DR1j) obtained in S1, i.e. the nineteenth coordinate value, the twenty-first coordinate value, the twenty-second coordinate value and the twenty-fourth coordinate value, the theoretical second elevation angle θL between the elevation measuring points DL1i, DL1j, DR1i, DR1j of the n-1# block can be obtained by calculating the distance between two points and the formula for calculating the angle of a straight line. sc .

[0118] S5: the first elevation angle value and the second elevation angle value are subjected to numerical operation to obtain an elevation angle error value;

[0119] In the embodiment, according to the first elevation angle value θL ll and the second elevation angle value θL sc , the elevation angle error ΔθL of the n-1# block can be obtained, i.e. ΔθL = θL sc - θL ll .

[0120] S6: according to the axis length error value, the axis plane angle error value and the elevation angle error value, the prefabrication error data of the first segment block is obtained.

[0121] In the embodiment, according to the axis length error value, the axis plane angle error value and the elevation angle error value, the prefabrication error data of the first segment block is obtained, and the error analysis output result of the n-1# block is as shown in Figure 11 .

[0122] By implementing the embodiment of the present application, the actual contour of the segment beam can be automatically drawn by the CAD drawing function, the visual error analysis is facilitated, and the actual spatial coordinates of the segment beam can be automatically corrected according to the error value, so as to achieve the purpose of automatic deviation correction for the next segment block prefabrication.

[0123] Optionally, according to the prefabrication error data of the first segment block, the overall coordinate data of the second segment block is subjected to theoretical position correction to obtain target coordinate data of the second segment block, and the specific process is as follows.

[0124] The second segment block is rotated and corrected on the plane with the axis plane deflection error value as the rotation angle, and rotated and corrected on the elevation with the elevation deflection error value as the rotation angle; and the target coordinate data of the second segment block is obtained according to the current theoretical position of the second segment block after rotation.

[0125] In the embodiment, since the actual measured axis length, plane deflection angle and elevation deflection angle of the n-1# block (first segment block) all have changes relative to the theoretical values, the i-end coordinate of the n# segment needs to be corrected so that the n# block (second segment block) is corrected to the design shape. The theoretical position correction of the i-end of the n# block beam segment is performed in two steps: first, the axis plane deflection error value Δθp is rotated on the plane, and then the elevation deflection error value ΔθL is rotated on the elevation, so that the corrected theoretical position i' of the i-end of the n# block (second segment block) beam segment is obtained, and the error correction is shown in Figure 12 The target coordinate data of the n# block (second segment block) is obtained. The corrected target coordinate data (PL2i', PM2i', PR2i', PL2j', PM2j', PR2j') of the n# block (second segment block) is updated to the segment beam theoretical six-point coordinate database formed in step 1014.

[0126] Step 104: The overall coordinate data and the target coordinate data of the second segment block are respectively visualized and analyzed to obtain the design shape and the actual spatial shape of the second segment block in the segment precast beam.

[0127] Optionally, step 104 specifically comprises: according to the parameters of the segment precast beam, the overall coordinate data of the second segment block is drawn in CAD to obtain the design shape of the second segment block in the segment precast beam; and the second segment block and the target coordinate data are revit modeled to obtain a three-dimensional BIM model of the actual spatial shape of the design shape of the second segment block in the segment precast beam.

[0128] In the embodiment, according to the parameters of the segment precast beam such as beam width and beam height and the coordinates on the front and rear seams of the segment beam (the overall coordinate data of the n# block second segment block) obtained in step 1015, the design spatial graph of the segment beam can be drawn in CAD through CAD secondary development, and the design shape of the second segment block is obtained, the segment beam plane design contour is drawn, as shown in Figure 13 , and the segment beam elevation design contour is drawn, as shown in Figure 14 , so as to facilitate comparison of the actual erected segment beam spatial line shape.

[0129] In this embodiment, based on the target coordinate data values ​​(PL2i', PM2i', PR2i', PL2j', PM2j', PR2j') of block n# obtained in step 103, the actual spatial form of the bridge after the segmental beam correction is drawn in CAD. The actual spatial form is compared with the drawn theoretical bridge form (design form). The comparison results between the actual spatial form and the design form are as follows: Figure 15 As shown, the theoretical and actual contours of the segmental beam are distinguished by color depth; the left side represents the planar surface, and the right side represents the elevation. This visually demonstrates the beam length error, planar skew angle error, and elevation skew angle error generated by the segmental beam. Direct measurement on CAD allows for comparison and verification with the beam length error ΔL, planar skew angle error Δθp, and elevation skew angle error Δθp calculated using the method of this invention. According to the method of this invention, the overall coordinates of the six points (PL2i, PM2i, PR2i, PL2j, PM2j, PR2j) at the front and rear segmental joints of any n# block (the second segmental block) obtained in step 1015, and the corrected target coordinates of the six points (PL2i', PM2i', PR2i', PL2j', 11PM2j', PR2j') at the front and rear segmental joints of the n# block (the second segmental block) obtained in step 103, combined with Revit secondary development, can be used to obtain the design and actual spatial form (3D BIM model) of the segmental precast beam, achieving better visualization. The segmental beam BIM 3D model is shown below. Figure 16 As shown.

[0130] Implementing this invention, the theoretical alignment (design form) of the segment is determined by the overall coordinate data of the second segment block, i.e., the theoretical six-point coordinates of the segment joint. The actual alignment (actual spatial form) of the segment is then determined by the target coordinate data of the segment joint after error analysis and correction. Through CAD secondary development, the program automatically draws the projected outline of the segment on the plane and its unfolded outline on the longitudinal section, distinguishing them with two different colored lines. This depicts the design form of the precast segment beam, visually showing the subtle differences between the theoretical and actual outlines of the segment block (error values ​​can be directly measured). It also allows for the determination of the direction and accuracy of correction, avoiding the possibility of larger errors. Combined with Revit secondary development modeling to generate a 3D BIM model, the actual spatial form of the segment beam is displayed more intuitively through the 3D BIM model.

[0131] Step 105: Continuously perform coordinate transformation between the global coordinate system and the local coordinate system, calculate and analyze the skew angle error, and correct the theoretical position for the overall coordinate data of two adjacent segments at different positions to obtain the design shape and actual spatial shape of all segments of the precast segment beam.

[0132] In the embodiment, when the design form and the actual spatial form of the current second segment block are obtained, the second segment block is used as the active matching adjacent next segment block to control construction, the overall coordinate data of the next segment block is extracted, the coordinate conversion between the overall coordinate system and the local coordinate system, the angle error calculation analysis and the theoretical position correction are performed according to the overall coordinate data of the second segment block and the next segment block, that is, steps 102-104 are performed, the target coordinate data of the next segment block is obtained, the overall coordinate data and the target coordinate data of the next segment block are respectively visualized, the design form and the actual spatial form of the current next segment block of the segment precast beam are obtained, and the current next segment is used as the active matching adjacent next segment block, the overall coordinate data of the two segment blocks is subjected to the coordinate conversion between the overall coordinate system and the local coordinate system, the angle error calculation analysis and the theoretical position correction, so that the design form and the actual spatial form of all segment blocks of the segment precast beam are continuously obtained.

[0133] The embodiment of the application is implemented, the design data table of the segment precast beam is read and analyzed by CAD, the overall coordinate data of all segments in the segment precast beam is generated, the overall coordinate data of the last segment (the first segment block) and the current segment (the second segment block) is subjected to the coordinate conversion between the overall coordinate system and the local coordinate system by CAD secondary development, the target coordinate data of the first segment block is obtained, the coordinate conversion between the overall coordinate system and the local coordinate system required by the short-line method segment precast beam is quickly realized, the calculation accuracy of other traditional solving formulas and the like is not high and the solving process is complex are avoided, the coordinate conversion and the calculation accuracy are fully ensured, and the efficiency of the visual control is improved. The target coordinate data and the coordinate measurement data of the first segment block are subjected to the angle error calculation analysis, the precast error data of the first segment block is obtained, the overall coordinate data of the second segment block is subjected to the theoretical position correction according to the precast error data of the first segment block, the target coordinate data of the second segment block is obtained, the segment beam precast error calculation is realized, the actual spatial coordinate of the segment beam is automatically corrected according to the error value, the purpose of the automatic deviation correction of the next segment block precast is achieved, and the influence of the error value is avoided. The overall coordinate data and the target coordinate data of the second segment block are respectively visualized, the design form and the actual spatial form of the second segment block precast beam are respectively obtained, the design contour and the actual contour of the segment beam are automatically drawn by the CAD drawing function, the visual error analysis is facilitated, and the control accuracy of the short-line method segment precast is improved.

[0134] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above-described specific embodiments are merely examples of the present application and are not intended to limit the protection scope of the present application. It is particularly pointed out that any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A CAD-based visual control method for segmental prefabrication using the short-line method, characterized in that, include: The design data table of the segmental precast beam is read and analyzed by CAD to generate the overall coordinate data of all segments in the segmental precast beam, and the overall coordinate data of two adjacent segments are extracted; wherein, the two adjacent segments are the first segment and the second segment, and the first segment serves as the movable end form to match the construction of the second segment. The overall coordinate data of the first segment block and the second segment block are transformed between the global coordinate system and the local coordinate system to obtain the target coordinate data of the first segment block. The coordinate measurement data of the first segment block is obtained, and the target coordinate data and coordinate measurement data of the first segment block are analyzed for angular error calculation to obtain the prefabrication error data of the first segment block. Based on the prefabrication error data of the first segment block, the overall coordinate data of the second segment block is theoretically corrected to obtain the target coordinate data of the second segment block. Visual analysis is performed on the overall coordinate data and target coordinate data of the second segment block to obtain the design shape and actual spatial shape of the second segment block in the segment precast beam. The process involves reading and analyzing the design data table of the precast segmental beam using CAD to generate the overall coordinate data of all segments in the precast segmental beam, and extracting the overall coordinate data of two adjacent segments. Specifically: The design data table of the segmental precast beam is read through the CAD; wherein, the design data table includes the design mileage value of each segment joint and the design precamber of each segment joint position; Based on the design data table, the coordinate values ​​of the intersection points of the front and rear segment joints with the beam axis of each segment are calculated using distance coordinates, thus obtaining the coordinate values ​​of the axis intersection points of each segment. Based on the coordinates of the intersection points of the axes, the intersection points of the webs on both sides of the axis are calculated along the normal direction of the line connecting the intersection points of the axes, and the coordinates of the intersection points of the webs on both sides of each segment are obtained. Based on the coordinates of the intersection of the axes and the intersection of the webs on both sides of each segment, the overall coordinate data of all segments in the precast beam is generated. Extract the overall coordinate data of two adjacent segment blocks to obtain the overall coordinate data of the first segment block and the second segment block in the segmental precast beam; wherein, the overall coordinate data of the first segment block includes the first coordinate value, the second coordinate value, the third coordinate value, the fourth coordinate value, the fifth coordinate value and the sixth coordinate value; the overall coordinate data of the second segment block includes the seventh coordinate value, the eighth coordinate value, the ninth coordinate value, the tenth coordinate value, the eleventh coordinate value and the twelfth coordinate value.

2. The CAD-based short-line segmental prefabrication visualization control method as described in claim 1, characterized in that, The step of performing coordinate transformation between the global coordinate system and the local coordinate system on the overall coordinate data of the first segment block and the second segment block to obtain the target coordinate data of the first segment block is specifically as follows: The overall coordinate data of the first segment block and the second segment block are read through the CAD, and the overall coordinate data is used as the coordinate value in the overall coordinate system. Based on the overall coordinate data of the first segment block, a first local coordinate system is established, and under the first local coordinate system, the measured data of the pre-embedded measurement points of the first segment block are transformed to obtain the overall coordinate values ​​of the pre-embedded measurement points under the overall coordinate system. Based on the overall coordinate data of the second segment block, a second local coordinate system is established, and under the second local coordinate system, the overall coordinate values ​​of the pre-embedded measurement points are transformed to obtain the target coordinate data of the first segment block.

3. The CAD-based short-line segmental prefabrication visualization control method as described in claim 2, characterized in that, The step of establishing a first local coordinate system based on the overall coordinate data of the first segment block, and then transforming the measured data of the pre-embedded measurement points of the first segment block under the first local coordinate system to obtain the overall coordinate values ​​of the pre-embedded measurement points under the overall coordinate system, specifically involves: In the CAD, establish a coordinate system with the fifth coordinate value as the base point, an X-axis with the direction from the fifth coordinate value to the second coordinate value, a Y-axis with the direction from the fifth coordinate value to the fourth coordinate value, and an XOY normal upward direction as the Z-axis to obtain the first local coordinate system; The CAD software reads the axis and elevation measurement points embedded in the first segment block before the concrete sets, and obtains the local coordinate values ​​of the pre-embedded measurement points. The local coordinate values ​​of the pre-embedded measurement points are substituted into the first local coordinate system using the CAD, and the local coordinate values ​​of the pre-embedded measurement points are transformed to obtain the overall coordinate values ​​of the pre-embedded measurement points in the overall coordinate system.

4. The CAD-based short-line segmental prefabrication visualization control method as described in claim 2, characterized in that, The step of establishing a second local coordinate system based on the overall coordinate data of the second segment block, and then transforming the overall coordinate values ​​of the pre-embedded measurement points within the second local coordinate system to obtain the target coordinate data of the first segment block, specifically involves: In the CAD, establish a coordinate system with the eleventh coordinate value as the base point, an X-axis with the direction from the eleventh coordinate value to the eighth coordinate value, a Y-axis with the direction from the eleventh coordinate value to the tenth coordinate value, and an XOY normal upward direction as the Z-axis to obtain the second local coordinate system. The overall coordinate values ​​of the pre-embedded measurement points are substituted into the second local coordinate system using the CAD, and the overall coordinate values ​​of the pre-embedded measurement points are transformed to obtain the target coordinate data of the first segment block; wherein, the target coordinate data includes the thirteenth, fourteenth, fifteenth, sixteenth, seventeenth and eighteenth coordinate values.

5. The CAD-based short-line segmental prefabrication visualization control method as described in claim 4, characterized in that, The step of obtaining the coordinate measurement data of the first segment block, and performing angular error calculation and analysis on the target coordinate data and coordinate measurement data of the first segment block to obtain the prefabrication error data of the first segment block, specifically involves: Based on the measured data of the pre-embedded measurement points collected at the beam yard at the matching position of the first segment block, the coordinate measurement data of the first segment block is obtained; wherein, the coordinate measurement data includes the nineteenth coordinate value, the twentieth coordinate value, the twenty-first coordinate value, the twenty-second coordinate value, the twenty-third coordinate value, and the twenty-fourth coordinate value; Perform planar distance calculation on the coordinate measurement data and the target coordinate data to obtain the axis length error value and the axis plane deflection angle error value; The thirteenth, fifteenth, sixteenth, and eighteenth coordinate values ​​are used to perform a straight line deflection angle calculation to obtain the first facade deflection angle value; The line deflection angle is calculated by performing the line deflection angle calculation on the nineteenth coordinate value, the twenty-first coordinate value, the twenty-second coordinate value, and the twenty-fourth coordinate value to obtain the second facade deflection angle value; The first facade deflection angle value and the second facade deflection angle value are numerically calculated to obtain the facade deflection angle error value; Based on the axis length error value, the axis plane deflection angle error value, and the facade deflection angle error value, the prefabrication error data of the first segment block is obtained.

6. The CAD-based short-line segmental prefabrication visualization control method as described in claim 5, characterized in that, The step of performing planar distance calculations on the coordinate measurement data and the target coordinate data to obtain the axis length error value and the axis plane deflection angle error value is specifically as follows: By calculating the distance between the fourteenth and seventeenth coordinate values ​​and performing the straight line deflection angle calculation, the theoretical beam length and the first axis plane deflection angle value are obtained. By calculating the distance between the two points and the straight line deflection angle using the twentieth and twentieth coordinate values, the actual beam length and the second axis plane deflection angle value are obtained. The theoretical beam length and the actual beam length are numerically calculated to obtain the axis length error value; The first axis plane deflection angle value and the second axis plane deflection angle value are numerically calculated to obtain the axis plane deflection angle error value.

7. The CAD-based short-line segmental prefabrication visualization control method as described in claim 5, characterized in that, The step of theoretically correcting the overall coordinate data of the second segment block based on the prefabrication error data of the first segment block to obtain the target coordinate data of the second segment block is as follows: Using the plane deflection angle error value as the rotation angle, the second segment block is rotated and corrected on the plane, and using the elevation deflection angle error value as the rotation angle, the second segment block is rotated and corrected on the elevation. Based on the current theoretical position of the second segment block after rotation, the target coordinate data of the second segment block is obtained.

8. The CAD-based short-line segmental prefabrication visualization control method as described in claim 1, characterized in that, The process involves visually analyzing the overall coordinate data and target coordinate data of the second segment block to obtain the design and actual spatial form of the second segment block within the precast segment beam. Specifically: Based on the parameters of the segmental precast beam, the overall coordinate data of the second segment block is used to draw the design shape of the second segment block in the segmental precast beam in the CAD. The second segment block and the target coordinate data are used to create a Revit model, resulting in a 3D BIM model of the actual spatial shape of the second segment block in the segmental precast beam.

9. The CAD-based short-line segmental prefabrication visualization control method as described in claim 1, characterized in that, After visually analyzing the overall coordinate data and target coordinate data of the second segment block to obtain the design shape and actual spatial shape of the second segment block in the segmental precast beam, the method further includes: By continuously performing coordinate transformation between the global coordinate system and the local coordinate system, calculating and analyzing the angular error, and correcting the theoretical position, the overall coordinate data of two adjacent segments at different positions are continuously processed to obtain the design shape and actual spatial shape of all segments of the precast segment beam.

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