A large-span arch bridge prototype resetting installation control method

Abstract

The application discloses a large-span arch bridge prototype resetting installation control method and relates to the technical field of bridges. The method comprises the following steps: S1, collecting the three-dimensional manufacturing linear posture of each arch rib segment in a pre-assembly factory by using a three-dimensional laser scanner; S2, converting the collected linear posture into a bridge installation posture, so as to obtain the target posture of each arch rib segment for installation; S3, installing the arch bridge by using the target posture of each arch rib segment for installation, and judging whether each arch rib segment reaches the target posture; if yes, the installation is completed; if not, S4 is entered; S4, adjusting the target posture of the arch rib segment that does not reach the target posture, accurately calculating the three-way jack adjustment value in the reverse direction by identifying the difference between the present posture and the target posture, and completing the installation after the adjustment is completed. The application improves the three-dimensional posture precision and construction efficiency required for installing the large-span arch bridge, saves the labor cost and safety management cost, guarantees the construction quality, and reduces the safety operation risk.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge, and particularly relates to a large-span arch bridge original shape resetting installation control method. BACKGROUND

[0002] The arch bridge can obtain free pre-pressure under the action of self weight, is in good compression state of full section, has advantages of reasonable stress, large stiffness, strong anti-seismic property, good durability and the like, becomes the most competitive bridge type in mountainous area, and is applied more and more widely. The large-span arch bridge is hoisted into an arch by using multiple segments in construction, and therefore the three-dimensional installation posture of each arch rib segment needs to meet the high-precision construction requirement of the large-span arch bridge. If the installation three-dimensional posture target and adjustment method of the arch rib segment are insufficient in precision, the cumulative error of the three-dimensional posture of the arch rib as a whole is prone to occurring after the installation of multiple arch rib segments, abnormal phenomena such as perpendicularity deviation of the arch rib, change of left-right amplitude center distance, and "eight" shaped mouth are caused, and the linear shape of the arch bridge is out of control. Therefore, in the large-span arch bridge, it is of important engineering application value to determine the high-precision installation three-dimensional posture target and adjustment method of the arch rib segment, so as to avoid the linear shape of the large-span arch bridge out of control.

[0003] The existing three-dimensional posture control method of the arch bridge segment usually makes corresponding marks on the arch rib in advance to form arch rib control points, and the three-dimensional posture control of the arch rib segment is performed by taking the arch rib control points as control targets. However, the following problems exist in the installation process of the large-span arch bridge segment: 1. The arch rib control points are usually obtained by making corresponding marks on the theoretical characteristic position of the arch rib in advance, and the installation of the arch rib control point marks in the manufacturing stage has error, and the characteristic position of the arch rib (such as the position of the flange plate) is greatly different from the theoretical position, so that there is a large error of the monitoring point relative to the design reference, and the installation target precision of the three-dimensional posture of the arch rib is insufficient; 2. During the installation of the arch rib segment, the adjustment is only performed by relying on the measurement data of a few arch rib control points, so that the accurate three-dimensional posture of the entire arch rib during the installation cannot be accurately obtained, and as the number of the installed arch ribs increases, the coordinate deviation of the monitoring point is larger, a large number of adjustment shims need to be added, and the construction quality and efficiency cannot be guaranteed; 3. During the adjustment of the arch rib segment, the adjustment of the three-dimensional posture of the arch rib is performed by the way of rope tensioning and relaxation, and there is no complete method for guiding the adjustment, and the adjustment precision and efficiency are low, and the installation requirements of the arch rib segment of the large-span arch bridge cannot be met.

[0004] Therefore, the large-span arch bridge original shape resetting installation control method is proposed to overcome the problems of insufficient precision of the three-dimensional posture target value of the arch rib segment, inaccurate determination of the three-dimensional posture during the installation of the arch rib segment, and low installation precision and efficiency caused by the lack of complete method for guiding the adjustment of the arch rib segment, so as to meet the requirements of the rapid and accurate installation of the three-dimensional posture of the large-span arch bridge. SUMMARY

[0005] Therefore, the application provides a large-span arch bridge prototype resetting installation control method, which solves the problems of insufficient accuracy of three-dimensional posture target values of arch rib segments, inaccurate determination of three-dimensional postures of arch rib segments during installation, and low installation accuracy and efficiency caused by lack of complete method guidance for segment adjustment of arch rib segments.

[0006] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0007] A large-span arch bridge prototype resetting installation control method comprises the following steps:

[0008] S1. Collecting three-dimensional manufacturing linear postures of each arch rib segment in a pre-piling factory by using a three-dimensional laser scanner;

[0009] S2. Converting the collected linear postures into bridge installation postures, so as to obtain target postures of each arch rib segment for installation;

[0010] S3. Installing the arch bridge by using the target postures of each arch rib segment for installation, and judging whether each arch rib segment reaches the target posture, if yes, completing the installation, and if not, entering S4;

[0011] S4. Adjusting the target postures of the arch rib segments that do not reach the target postures, and completing the installation after the adjustment.

[0012] Optionally, the specific content of S1 is that: the three-dimensional laser scanner is erected at the planned scanning station sites, and scanning spherical targets are arranged between the scanning stations for subsequent data splicing. The point clouds are matched and aligned through the scanning spherical targets, so that the coordinate system conversion matrix between the point clouds is obtained, and the matching between the point clouds of each station is completed.

[0013] Optionally, before S1, a chessboard is set as a measurement tool of the three-dimensional laser scanner.

[0014] Optionally, the number of the chessboards is at least three, the connecting lines of the centers of the chessboards are not on the same straight line, and the size of the chessboard is not less than 210mm*297mm.

[0015] Optionally, the specific content of S2 is that:

[0016] After the rotation and translation relationship between the three-dimensional postures of the arch ribs in the pre-piling field and the design installation postures of the bridge position is calculated, the target three-dimensional posture point cloud model of the bridge position arch rib installation is obtained, so that the target postures of each arch rib segment for installation are obtained.

[0017] Optionally, the specific content of installing the arch bridge by using the target posture of installing each arch rib segment in S3 is as follows:

[0018] The three-dimensional posture of the arch rib segment is collected by a three-dimensional laser scanner. In the target three-dimensional posture point cloud model of the arch rib installation at the bridge site, the coordinates of the center points of the black and white chessboard are extracted by using the point cloud professional processing software as the target of the black and white chessboard of the arch rib segment during installation. After the arch rib segment is placed in position, the three-directional coordinates of the chessboard are measured by using the total station.

[0019] Optionally, the specific content of adjusting the target posture of the arch rib segment that does not reach the target posture by using the three-directional jack in S4 is as follows:

[0020] The arch rib posture adjustment system at the bridge site is composed of four three-directional jacks and their supporting brackets. The four corner points of the arch rib segment need to be placed on the three-directional jacks. After the arch rib segment is placed in position, the three-directional coordinates of the chessboard are measured by using the total station. The measured three-directional coordinates of the n-th chessboard measuring point at the first measurement are The theoretical three-directional coordinates of the n-th chessboard measuring point at the first measurement are (x ln ,y ln ,z ln ) T , n≥3, and the three-directional deviation values of the measured values and the theoretical values of all the chessboard measuring points at the first measurement are obtained:

[0021]

[0022] According to the three-directional displacement of each three-action jack, the three-directional coordinate influence matrix of each measuring point, and the three-directional deviation values of the measuring points, the elongation of the longitudinal, transverse, and vertical jacks of each three-action jack is calculated:

[0023]

[0024] wherein d x1s …d xns is the elongation of the longitudinal jack of the 1-nth three-action jack; d y2s …d yns is the elongation of the transverse jack of the 1-nth three-action jack, d z1s …d zns is the elongation of the vertical jack of the 1-nth three-action jack; and d k1 …d kn is the deviation value of the measured value and the theoretical value of the 1-nth chessboard measuring point at the first measurement.

[0025] C 11 …C n1The influence of the unit three-dimensional displacement change of the No. 1 three-acting jack on the three-dimensional displacement of the No. 1-n measuring point is counted as a matrix; C 12 …C n2 The influence of the unit three-dimensional displacement change of the No. 2 three-acting jack on the three-dimensional displacement of the No. 1-n measuring point is counted as a matrix; C 2n The influence of the unit three-dimensional displacement change of the No. n three-acting jack on the three-dimensional displacement of the No. 2 measuring point is counted as a matrix, C nn The influence of the unit three-dimensional displacement change of the No. n three-acting jack on the three-dimensional displacement of the No. n measuring point is counted as a matrix.

[0026] Optionally, after the adjustment of the three-dimensional posture of the arch rib segment is completed, the three-dimensional coordinates of the chess grid are rechecked using a total station instrument, and after the rechecking of the three-dimensional coordinates of the chess grid, the existing installation target posture of the arch rib is detected in a point cloud professional processing software using a three-dimensional laser scanner, and the installation of the arch rib original shape reset posture is considered to be completed when the accuracy is higher than 2 mm.

[0027] According to the technical scheme, compared with the prior art, the present application provides a large-span arch bridge original shape reset installation control method, which has the following beneficial effects:

[0028] (1) The three-dimensional laser scanning technology is used to collect the three-dimensional accurate manufacturing linear posture of the arch rib segment in the pre-assembly factory, and the manufacturing linear posture is converted to a bridge installation posture, so that the accurate three-dimensional posture is used as the installation control target posture of each arch rib segment, and the influences of the arch rib segment manufacturing error and the arch rib control point centering error are avoided, and the control accuracy is improved.

[0029] (2) Before the arch rib three-dimensional posture scanning collection in the pre-assembly field, a chess grid is set as a measurement tool of the scanner and the total station instrument, and the coordinates of the chess grid can be detected by the total station instrument during the on-site arch rib installation adjustment process, so that the adjustment state of the arch rib can be quickly monitored.

[0030] (3) After the adjustment of the arch rib three-dimensional posture is completed, the three-dimensional posture of the arch rib is collected by the three-dimensional laser scanner, and whether the target posture is reached is accurately detected, so that the accuracy requirement of the large-span arch bridge arch rib segment installation is better met.

[0031] (4) The three-dimensional posture of the arch rib is adjusted by using a three-dimensional jack on site, the adjustment value of the three-dimensional jack is accurately calculated in reverse by identifying the difference between the on-site posture and the target posture, the accurate control and adjustment of the three-dimensional posture of the large-span arch bridge segment are completed, and the construction efficiency and accuracy are improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute a part of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0033] Figure 1 A large-span arch bridge original shape resetting installation control method flow chart is provided for the present application.

[0034] Figure 2 A chessboard grid schematic diagram is provided for the embodiments of the present application.

[0035] Figure 3 A to-be-installed arch rib segment structure schematic diagram is provided for the embodiments of the present application.

[0036] Figure 4 A chessboard grid arrangement position schematic diagram is provided for the embodiments of the present application.

[0037] Figure 5 A site planning schematic diagram is provided for the embodiments of the present application.

[0038] Figure 6 A scanning ball arrangement schematic diagram is provided for the embodiments of the present application.

[0039] Figure 7 A chessboard grid scanning point cloud diagram is provided for the embodiments of the present application.

[0040] Figure 8 A support and three-way jack arrangement schematic diagram is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] Referring to Figure 1 The present application discloses a large-span arch bridge original shape resetting installation control method, comprising the following steps:

[0043] S1. Collecting the three-dimensional manufacturing linear attitude of each arch rib segment in the pre-piling factory by using a three-dimensional laser scanner;

[0044] S2. Converting the collected linear attitude into a bridge installation attitude, so as to obtain the target attitude of each arch rib segment for installation;

[0045] S3. Install the arch bridge using the target posture of each arch rib segment for installation, and determine whether each arch rib segment reaches the target posture, if yes, complete the installation, if not, enter S4;

[0046] S4. Adjust the target posture for the arch rib segment that does not reach the target posture, and complete the installation after the adjustment is completed.

[0047] Further, the specific content of S1 is: erect a three-dimensional laser scanner at the planned scanning station site, arrange a scanning spherical target between the scanning stations for subsequent data splicing, match and align the point clouds through the scanning spherical target, thereby obtaining the coordinate system transformation matrix between the point clouds, and completing the matching between the point clouds at each station.

[0048] Further, before S1 uses the three-dimensional laser scanner to collect the three-dimensional manufacturing linear posture of each arch rib segment in the pre-splicing field, a checkerboard is set as a measurement tool for the three-dimensional laser scanner.

[0049] Further, the number of checkerboards is at least three, the connecting line of the centers of each checkerboard is not on the same straight line, and the size of the checkerboard is not less than 210mm×297mm.

[0050] Further, the specific content of S2 is to convert the collected linear posture into a bridge installation posture, thereby obtaining the target posture of each arch rib segment for installation:

[0051] After calculating the rotation and translation relationship between the pre-splicing arch rib three-dimensional posture and the bridge design installation posture, the bridge arch rib installation target three-dimensional posture point cloud model is obtained, thereby obtaining the target posture of each arch rib segment for installation.

[0052] Further, the specific content of S3 is to install the arch bridge using the target posture of each arch rib segment for installation, and determine whether each arch rib segment reaches the target posture:

[0053] The three-dimensional posture of the arch rib segment is collected by the three-dimensional laser scanner, the coordinates of the center points of the black and white checkerboard are extracted by using the point cloud professional processing software in the bridge arch rib installation target three-dimensional posture point cloud model, as the target of the black and white checkerboard of the arch rib segment during installation, and the three-dimensional coordinates of the checkerboard are measured by using the total station after the arch rib segment is placed in place.

[0054] Further, the specific content of S4 is to adjust the target posture of the arch rib segment that does not reach the target posture by using the three-dimensional jack:

[0055] The arch rib posture adjusting system at the bridge site is composed of four three-way jacks and their supporting brackets. The four corner points of the arch rib segment need to be placed on the three-way jacks. After the arch rib segment is placed in position, the three-way coordinates of the chessboard grids are measured by using a total station. The measured three-way coordinates of the n-th chessboard grid measuring point in the first measurement are The theoretical three-way coordinates of the n-th chessboard grid measuring point in the first measurement are (x ln ,y ln ,z ln ) T , n≥3, and the three-way deviation values of the measured values and the theoretical values of all the chessboard grid measuring points in the first measurement are obtained:

[0056]

[0057] According to the three-way displacement influence matrix of each three-way jack on the three-way coordinates of each measuring point and the obtained three-way deviation values of the measuring points, the elongation amounts of the longitudinal, transverse and vertical jacks of each three-way jack are calculated:

[0058]

[0059] Wherein, d x1s …d xns is the elongation amount of the longitudinal jack of the 1-nth three-way jack; d y2s …d yns is the elongation amount of the transverse jack of the 1-nth three-way jack, d z1s …d zns is the elongation amount of the vertical jack of the 1-nth three-way jack; d k1 …d kn is the deviation value of the measured value and the theoretical value of the 1-nth chessboard grid measuring point in the first measurement;

[0060] C 11 …C n1 is the influence statistical matrix of the change amount of the unit three-way displacement of the 1st three-way jack on the three-way displacement of the 1-nth measuring point; C 12 …C n2 is the influence statistical matrix of the change amount of the unit three-way displacement of the 2nd three-way jack on the three-way displacement of the 1-nth measuring point; C 2n is the influence statistical matrix of the change amount of the unit three-way displacement of the n-th three-way jack on the three-way displacement of the 2nd measuring point, and C nn is the influence statistical matrix of the change amount of the unit three-way displacement of the n-th three-way jack on the three-way displacement of the n-th measuring point.

[0061] Further, after the three-dimensional posture adjustment of the arch rib segment is completed, the three-direction coordinates of the chess grid are rechecked using a total station. After the rechecking of the three-direction coordinates of the chess grid, the existing installation target posture of the arch rib is detected in point cloud professional processing software using a three-dimensional laser scanner, and the precision is higher than 2mm, which is considered to complete the installation of the arch rib original shape reset posture.

[0062] In one embodiment, as shown in FIG. 1, taking the installation of a certain arch bridge segment as an example, the following contents are specifically included. Figure 3

[0063] (I) Setting chess grid

[0064] As shown in FIG. 2, the chess grid is set at a proper position of the arch rib segment after the posture adjustment in the pre-assembly field. The following principles should be followed when selecting the position of the chess grid: the number of the chess grids should not be less than 3; the connecting line of the centers of the chess grids should not be a straight line; and the size of the chess grid should not be less than 210mmx297mm. The set chess grid is shown in FIG. 3. Figure 4 Figure 2

[0065] (II) Scanning station planning in the pre-assembly field

[0066] As shown in FIG. 4, the following requirements should be met when setting the stations: four basic stations are set for each arch rib station, and the stations are divided into small mileage left station, small mileage right station, large mileage left station and large mileage right station according to the position; the stations are located away from the beam body side, and the distance dz from the arch rib corner point should satisfy 10m≤dz≤20m; the angle a between the connecting line of the station and the arch rib axis direction should satisfy 40°≤a≤60°. In the present application, dz=20m and a=45°. Figure 5

[0067] (III) Three-dimensional posture scanning of arch rib in the pre-assembly field

[0068] Before the data collection of the on-site beam body is performed, the relevant parameter setting of each scanning station is needed. In the present application, the "distance" parameter of the scanner is selected as 120m, and the target object resolution is 3.1mm / 10m.

[0069] The scanning spherical targets need to be arranged between the two scanning stations for subsequent data splicing. As shown in FIG. 5. Figure 6 ​​​​As shown, the scanning spherical target needs to meet the following requirements: at least two scanning spherical targets are arranged between stations; the axis direction projection dy1 of the 1# scanning ball between stations and the center of the arch rib should meet 10m≤dy1≤15m; the axis direction projection dy2 of the 2# scanning ball between stations and the center of the arch rib should meet 20m≤dy2≤25m; the axis direction projection dx1 of the 1# scanning ball between stations and the center of the arch rib should meet 5m≤dx1≤10m; the axis direction projection dx2 of the 2# scanning ball between stations and the center of the arch rib should meet 5m≤dx2≤10m and dx1+dx2≥8m. The present application adopts dy1=10m, dy2=20m, dx1=10m and dx2=5m.

[0070] (IV) Scanning point cloud data matching, the scanning point cloud is matched and aligned through the scanning spherical target, and the principle is as follows:

[0071] (1) Assuming that the fitting circle center coordinates are (x0, y0, z0), the spherical equation is:

[0072] (x-x0) 2 +(y-y0) 2 +(z-z0) 2 =r 2

[0073] Expanding and moving the term, we have:

[0074] Assuming that there are n points to be spherical, x0, y0, z0, are estimated parameters, then we have:

[0075]

[0076]

[0077]

[0078]

[0079] In the formula, Y is an observation vector, A is a coefficient matrix, and X is an estimated parameter vector.

[0080] The loss function is constructed as:

[0081] Expanding, we have:

[0082] Taking the derivative, we have:

[0083] Let it be zero, and solve

[0084]

[0085]

[0086] Further, the coordinates of the ball center (x0, y0, z0) are obtained.

[0087] (2) Conversion matrix solving

[0088] Here, the second-stage corresponding circle center set P B →A is denoted as P C , a rotation matrix R and a translation matrix T are set, and P A = R*P B +T.

[0089] The average coordinates of P A and P B are calculated:

[0090] Unitary matrix calculation:

[0091] Singular value decomposition: [U, S, V] = SVD(H);

[0092] Thus, according to the least squares method, R = VU T ;

[0093] Thus, T = -R*centroid A +centroid B ;

[0094] Through the above steps, the coordinate system conversion matrix between the point clouds is solved, and the matching between the point clouds of each station is completed.

[0095] (Five) Obtain the bridge arch rib installation target three-dimensional pose point cloud model, set the point cloud data collected in the pre-patching field and the point cloud data of the assembled and processed completed point cloud data as P A , the point cloud data of the bridge arch rib installation target three-dimensional pose is P B , and

[0096] P B =T θ ×T α ×T β ×T P ×P A

[0097] Wherein, P A is two known n*m coordinate matrices, n is the number of point clouds, m is a number greater than the space dimension of the feature point by one, and here m = 4; P B is the matrix after rotation and translation; T θ , T α , T βis the rotation matrix around X, Y, Z coordinate axis; T is the translation matrix: P is the translation matrix:

[0098]

[0099]

[0100]

[0101]

[0102] In the formula, θ, α, β are the angles of rotation around X, Y, Z axis, and γ, λ, μ are the distances of translation around X, Y, Z direction.

[0103] Accordingly, the rotation and translation relationship between the three-dimensional posture of the pre-assembled arch rib and the installation posture of the bridge site is obtained, and the three-dimensional posture point cloud model of the arch rib installation target of the bridge site is obtained.

[0104] According to the conversion relationship, we can get:

[0105]

[0106]

[0107]

[0108]

[0109] (Six) Extracting the target control value of the bridge site arch rib installation chessboard

[0110] In the three-dimensional posture point cloud model of the bridge site arch rib installation target, the coordinates of the black and white chessboard center points are extracted in the point cloud professional processing software, which are the targets of the arch rib segment black and white chessboard during installation, as shown in Figure 7 The chessboard scanning point cloud diagram is shown.

[0111] (Seven) Bridge site arch rib posture adjustment system in place

[0112] The bridge site arch rib posture adjustment system is composed of four three-way jacks and their supporting brackets, and the four corner points of the arch rib segment need to be placed on the three-way jacks, as shown in Figure 8 The layout of the support and three-way jack is shown.

[0113] (Eight) Arch rib segment installation adjustment After the arch rib segment is placed in place, the three-dimensional coordinates of the chessboard are measured using a total station.

[0114] (1) The first measurement of the three-dimensional coordinates of the 1# chessboard measurement point is The first measurement of the three-dimensional coordinates of the 2# chessboard measurement point is The first measurement of the chessboard grid measurement point is the actual three-dimensional coordinate

[0115] (2) The first chessboard target control value three-dimensional coordinate is (x l1 ,y l1 ,z l1 ) T , the second chessboard target theoretical value three-dimensional coordinate is (x l2 ,y l2 ,z l2 ) T , …, the n-th chessboard target theoretical value three-dimensional coordinate is (x ln ,y ln ,z ln ) T . Therefore, the deviation value of the first measurement of the first chessboard grid measurement point from the theoretical value is the deviation value of the first measurement of the second chessboard grid measurement point from the theoretical value is …, the deviation value of the first measurement of the chessboard grid measurement point from the theoretical value is At this time, the deviation value of the first measurement of all chessboard grid measurement points from the theoretical value is obtained:

[0116]

[0117] According to the coordinate measurement

[0118]

[0119] (Nine) Precise calculation of three-dimensional jack adjustment amount

[0120] Let the influence matrix of the unit three-dimensional displacement change of the n-th three-action jack on the three-dimensional displacement of the m-th measurement point be C nm .

[0121] For the first three-dimensional jack, the influence statistics of the unit three-dimensional displacement change of the first three-action jack on the three-dimensional displacement of the first measurement point is the matrix C 11 , the influence statistics of the three-dimensional displacement of the second measurement point is the matrix C 12 , …, the influence statistics of the three-dimensional displacement of the n-th measurement point is the matrix C 1n , then:

[0122]

[0123] Where d xns is the extension amount of the longitudinal bridge jack of the n-th three-action jack; d yns is the extension amount of the transverse bridge jack of the n-th three-action jack; d znsdnmx represents the longitudinal bridge direction displacement of the mth measuring point under the influence of the displacement of the nth three-way jack; dnmy represents the transverse bridge direction displacement of the mth measuring point under the influence of the displacement of the mth three-way jack; and dnmz represents the vertical direction displacement of the mth measuring point under the influence of the displacement of the nth three-way jack.

[0124] Similarly, for the 2nd three-way jack, there are:

[0125]

[0126] Similarly, for the nth three-way jack, there are:

[0127]

[0128] According to the influence matrix of the three-way displacement of each three-way jack on the three-way coordinates of each measuring point and the obtained three-way deviation values of each measuring point, the elongation of the longitudinal, transverse and vertical jacks of each three-way jack is calculated:

[0129]

[0130] That is:

[0131]

[0132] Further, there are:

[0133]

[0134] From the above, the elongation of the longitudinal, transverse and vertical jacks of each three-way jack is calculated.

[0135] Since the matrix is determined when the positions of the three-way jacks are determined, it can be solved from the above:

[0136]

[0137] (X) Detection of the installation posture of the original shape of the arch rib

[0138] After the three-dimensional posture adjustment of the arch rib segment is completed, the three-way coordinates of the chess grid are rechecked using a total station. After rechecking the three-way coordinates of the chess grid, the existing installation three-dimensional posture of the arch rib is detected in a point cloud professional processing software using three-dimensional scanning technology, and the precision is higher than 2mm, which is considered to complete the installation of the original shape of the arch rib.

[0139] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the installation of a full-scale arch bridge, characterized by, The method comprises the following steps: S1. Collecting the three-dimensional manufacturing linear posture of each arch rib segment in the pre-assembly factory by using a three-dimensional laser scanner; S2. Converting the collected linear posture into a bridge installation posture, thereby obtaining the target posture of each arch rib segment for installation; S3. Installing the arch bridge by using the target posture of each arch rib segment for installation, and judging whether each arch rib segment reaches the target posture, if yes, completing the installation, if not, entering S4; S4. Adjusting the target posture of the arch rib segment that does not reach the target posture, and completing the installation after the adjustment is finished; The specific content of adjusting the target posture of the arch rib segment that does not reach the target posture by using a three-way jack in S4 is as follows: The arch rib attitude adjustment system at the bridge site consists of four three-way jacks and their supporting supports. The four corner points of the arch rib segment need to be placed on the three-way jacks. After the arch rib segment is in place, a total station is used to measure the three-way coordinates of the checkerboard pattern. Let the measured three-way coordinates of the nth checkerboard point during the first measurement be... The theoretical three-dimensional coordinates of the nth chessboard grid measuring point during the first measurement are: For n≥3, obtain the three-dimensional deviation values ​​between the measured values ​​and theoretical values ​​of the first measurement of all chessboard grid measurement points: ； According to the three-way displacement of each three-way jack, the three-way coordinate influence matrix of each measuring point, and the three-way deviation value of the measuring point that has been obtained, the elongation of the longitudinal, transverse, and vertical jacks of each three-way jack is calculated: wherein, … is the elongation of the 1-nth tri-action jack in the longitudinal direction of the bridge; … is the elongation of the 1-nth tri-action jack in the transverse direction of the bridge, … is the elongation of the 1-nth tri-action jack in the vertical direction of the bridge; … is the deviation value of the 1-nth chessboard grid measuring point in the first measurement between the measured value and the theoretical value; … is the influence of the change quantity of the unit three-way displacement of the No. 1 three-action jack on the three-way displacement of the No. 1-n measuring point, which is counted as a matrix; … is the influence of the change quantity of the unit three-way displacement of the No. 2 three-action jack on the three-way displacement of the No. 1-n measuring point, which is counted as a matrix; is the influence of the change quantity of the unit three-way displacement of the No. n three-action jack on the three-way displacement of the No. 2 measuring point, which is counted as a matrix, is the influence of the change quantity of the unit three-way displacement of the No. n three-action jack on the three-way displacement of the No. n measuring point, which is counted as a matrix; Before S1, a chessboard is set as a measuring tool of the three-dimensional laser scanner.

2. The method according to claim 1, characterized in that, The specific content of S1 is that a three-dimensional laser scanner is erected at the planned scanning station, spherical targets are arranged between the scanning stations for subsequent data splicing, the point clouds are matched and aligned through the spherical targets, thereby obtaining the coordinate system conversion matrix between the point clouds, and the matching between the point clouds of each station is completed.

3. The method according to claim 1, characterized in that, The number of the chessboards is at least three, the connecting line of the centers of the chessboards is not on the same straight line, and the size of the chessboard is not less than 210 mm x 297 mm.

4. The method according to claim 1, characterized in that, The specific content of S2 is as follows: After the rotation and translation relationship between the three-dimensional posture of the arch rib in the pre-assembly factory and the design installation posture of the bridge is calculated, the target three-dimensional posture point cloud model of the arch rib installation at the bridge is obtained, thereby obtaining the target posture of each arch rib segment for installation.

5. The method according to claim 1, characterized in that, The specific content of S3 is as follows: The three-dimensional posture of the arch rib segment is collected by using a three-dimensional laser scanner, in the target three-dimensional posture point cloud model of the arch rib installation at the bridge, the coordinates of the center points of the black and white chessboards are extracted by using a point cloud professional processing software as the target of the black and white chessboard of the arch rib segment during installation, after the arch rib segment is placed in position, the three-way coordinates of the chessboard are measured by using a total station.

6. The method according to claim 1, characterized in that, Also included in the arch rib segment three-dimensional posture adjustment is completed, using total station on the chess grid three direction coordinate review, chess grid three direction coordinate review, using three-dimensional laser scanner on the existing installation of the target posture in point cloud professional processing software detection, the accuracy is higher than 2mm is considered to complete the arch rib original shape reset posture installation.

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