Assembled Y-shaped pier bridge construction platform capable of being monitored and monitoring method of assembled Y-shaped pier bridge construction platform

Abstract

The invention discloses a monitorable spliced Y-shaped pier bridge construction platform and a monitoring method thereof.The construction platform is located on the periphery of a Y-shaped pier and comprises four sets of rotatable spliced L-shaped platforms, the four sets of rotatable spliced L-shaped platforms are rotationally spliced to form an annular platform, and the Y-shaped pier is located in the center; each group of rotatable spliced L-shaped platforms comprises an L-shaped supporting frame, an L-shaped platform, a straining beam arranged on the upper surface of the L-shaped supporting frame and used for supporting the L-shaped platform and a stand column supporting structure, and the stand column supporting structure is rotatably connected with the L-shaped supporting frame. By means of rotation and splicing of the modular construction platform, the influence on a construction road and green belts on the two sides is avoided to a great extent, and compared with a traditional full hall type scaffold and steel bar embedding method, the limitation of site conditions on construction is reduced, the construction efficiency is improved, and the human input is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge concrete engineering construction, and particularly relates to a monitorable assembled Y-shaped pier bridge construction platform and a monitoring method thereof. Background Technique

[0002] With the continuous improvement of the urbanization level, the original ground roads are increasingly unable to bear the growing traffic volume. To solve the traffic problems, urban roads are continuously developed upwards and downwards, and there are more and more elevated roads and underground passages. However, in some cities, due to the large traffic volume of the roads to be renovated and the restrictions of the terrain conditions on both sides, it is necessary to ensure the implementation of the rapid road renovation while ensuring the smooth flow of the roads. The contradiction between the need to ensure the traffic during the current road construction and the need for renovation construction is prominent.

[0003] In bridge construction, the traditional method generally uses full hall scaffolding as the bridge pier construction platform. The full hall scaffolding requires a relatively high bearing capacity of the bottom foundation. When the bearing capacity of the bottom does not meet the standard, hardening treatment is required, and the construction party needs to consider many factors.

[0004] The large cantilever capping beam is often paired with the streamlined pier, with a beautiful and smooth line shape. At the same time, when building the construction platform for this type of bridge, it is necessary to consider building piers in the green belts on both sides of the road and the central isolation belt to save the urban road surface under the ramp bridge and ensure the smooth flow of the original traffic road.

[0005] When a larger construction platform is needed on site to meet the construction conditions, the assembly between construction platforms often becomes the biggest construction problem. The different construction platform segments need to be aligned parallel in the horizontal plane and kept at the same height in the vertical direction to ensure the smooth splicing between segments. Summary of the Invention

[0006] Aiming at the above problems, the purpose of the present invention is to provide a monitorable assembled Y-shaped pier bridge construction platform and a monitoring method thereof.

[0007] The specific technical solutions are as follows:

[0008] A monitorable assembled Y-shaped pier bridge construction platform is located around the Y-shaped pier and includes four groups of rotatable spliced L-shaped platforms. After the four groups of rotatable spliced L-shaped platforms are rotated and spliced, they form an annular platform, with the Y-shaped pier in the center. Each group of rotatable spliced L-shaped platforms includes an L-shaped support frame, an L-shaped platform, a tie beam and a column support structure arranged on the upper surface of the L-shaped support frame for supporting the L-shaped platform. The column support structure is rotatably connected to the L-shaped support frame.

[0009] Further, the column support structure includes a slewing unit, a jacking frame, columns, and a column foundation cap. The lower end of the column is fixedly connected to the ground through the column foundation cap, the upper end of the column is sleeved with a jacking frame, and the top of the jacking frame is connected to a rotatable spliced L-shaped platform through the slewing unit.

[0010] Further, the L-shaped support frame includes standard steel truss sections connected end to end. DIC target points are provided at one end of each standard steel truss section and on the second vertical beam at the other end.

[0011] Further, the bottom of the Y-shaped pier is fixedly connected to the ground through a pier foundation cap, and a large cantilever capping beam is provided at the top of the Y-shaped pier.

[0012] A monitoring method for a monitorable prefabricated Y-shaped pier bridge construction platform includes the following steps:

[0013] 1) Complete relevant components in the factory according to the design drawings, transport the components to the construction site, set the column foundation cap at the designed position, and complete the installation of the columns, jacking frame, and slewing unit;

[0014] 2) After lifting the standard steel truss sections to the designed elevation by a hoisting device, connect and splice the standard steel truss sections to form an L-shaped support frame;

[0015] 3) Complete the installation of the L-shaped platform, crossbeam, and DIC target points;

[0016] 4) Set a DIC measurement camera for each group of rotatable spliced L-shaped platforms. After adjusting and reducing the error through the calculated height difference and angular difference of the straight line formed by two DIC target points, perform the rotational connection between the rotatable spliced L-shaped platforms;

[0017] 5) Data acquisition: Connect the camera to the control system or data processing terminal through a wireless local area network to ensure smooth data transmission. Secondly, in the camera settings interface, manually or automatically adjust the exposure time and gain value to optimize the brightness and contrast of the image, ensure that the image quality is suitable for subsequent processing, and then apply an appropriate filtering algorithm to denoise the collected image to reduce the random noise in the image while retaining the edge details of the image to prevent edge blurring. The target data obtained from the monitoring is used to extract feature points - checkerboard angle points using the Canny edge detection algorithm, and then based on the extracted edge information, determine the centroid position of the target, and calculate the internal parameters and distortion parameters of the industrial camera using the actual coordinates and image coordinates of these feature points;

[0018] 6) Vertical matching of data processing and control points: According to the actual size L of the calibration target and the number of pixels P occupied by the target in the image, calculate the actual length S represented by a single pixel. Finally, based on the internal parameters, distortion parameters, and scale factor S of the industrial camera, construct the vertical coordinate system z of each measurement point in the image. By comparing the changes in the positions of the measurement points in different images, convert them into the actual vertical displacement Δz, thereby realizing deflection measurement; the height matching in the vertical plane is ensured by the collaborative determination of the DIC target points and the industrial camera;

[0019] 7) Precise matching of the two end connection points in the horizontal plane: Through the intelligent matching method of splicing control points using the iterative closest point algorithm, assume that N = {n 1 , n 2 , …, n n} and Z = {z 1 , z 2 , …, z n} are two control points to be matched. First, select four non-coplanar points in N as the point basis, so as to determine the point distances d 1 and d 2 , the scale factors r 1 and r 2 and the included angle β. For the points in Z, calculate the points with distances in [d 1 - δ, d 1 - δ], [d 2 - δ, d 2 - δ] respectively and include them in the point sets S 1 , S 2 , where δ is the allowable error value. Determine the intersection coordinates e 1 , e 2 from S 1ij , e 2ij . Search for the point set pairs in S 1 and S 2 that meet the conditions that e 1 i j , e 2 i j are approximately equal and the included angle between the two connecting lines is approximately equal to β, so as to intelligently select the four-point basis z 1 , z 2 , …, z n corresponding to the point basis n 1 , z 2 , …, z n . Furthermore, obtain the transformation matrix M between N and Z. Since the transformation matrix M can only ensure the minimum matching error of the point basis, the ICP algorithm needs to be used for fine matching. The objective function of the ICP algorithm is

[0020]

[0021] where zi With n i are respectively the pre-connected control point pairs at both ends; n is the center of the splicing control points, and R and T are respectively the rotation matrix and the translation matrix, and their matrices can be specifically expressed as:

[0022] R = UV T

[0023]

[0024] W = UΣV T

[0025] μ z and μ n are respectively the coordinate averages of the control point sets at both ends; the diagonal matrix ∑, the left singular matrix U, and the right singular matrix V are all obtained by the singular value decomposition of the matrix W, and the accurate matching of the control connection at both ends is realized through the output of the point set obtained by the objective function.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1) By means of the rotation and splicing of the modular construction platform, the present invention greatly avoids the influence on the construction road and the green belts on both sides. Compared with the traditional full hall scaffolding and embedded steel bar method, it reduces the construction restrictions of the site conditions, improves the construction efficiency, and reduces the labor input.

[0028] 2) The sectional jacking installation of the steel truss columns omits the construction time and labor cost of the crane hoisting compared with the circular steel columns, and simplifies the construction process.

[0029] 3) The intelligent monitoring equipment realizes the real-time reading, storage, transmission, management, analysis, and early warning of sensor data. By means of error monitoring and error adjustment, not only can some manual detection operations with low efficiency and strong subjectivity be liberated, but also according to the real-time information processing of the cloud platform, the safety and controllability of the construction platform erection and construction process can be guaranteed, and a health monitoring system that emphasizes both effectiveness and safety can be built, reducing the error troubles that may occur during the on-site construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the structural schematic diagram of the present invention;

[0031] Figure 2 is the schematic diagram of the rotatable spliced L-shaped platform before construction rotation;

[0032] Figure 3 is the schematic diagram of the rotatable spliced L-shaped platform after rotation and splicing;

[0033] Figure 4 is the structural schematic diagram of the L-shaped support frame and the tie beam.

[0034] In the figure: 1. Y-shaped pier; 11. Pier column foundation cap; 12. Large cantilever capping beam; 2. Rotatable spliced L-shaped platform; 21. L-shaped support frame; 211. Standard section of steel truss; 22. L-shaped platform; 23. Tie beam; 24. Column support structure; 241. Rotary unit; 242. Jacking frame; 243. Column; 244. Column foundation cap; 25. DIC target point. Specific implementation mode

[0035] The present invention will be further described below in conjunction with the accompanying drawings of the specification, but the protection scope of the present invention is not limited thereto.

[0036] As Figure 4 shown, each group of rotatable spliced L-shaped platforms 2 includes an L-shaped support frame 21, an L-shaped platform 22, a tie beam 23 arranged on the upper surface of the L-shaped support frame 21 for supporting the L-shaped platform 22, and a column support structure 24. The L-shaped support frame 21 includes standard sections of steel trusses 211 connected end to end. DIC target points 25 are provided at one end and the second vertical beam at the other end of each standard section of steel truss 211. As Figure 1 shown, the column support structure 24 includes a rotary unit 241, a jacking frame 242, a column 243, and a column foundation cap 244. The lower end of the column 243 is fixedly connected to the ground through the column foundation cap 244. The upper end of the column 243 is sleeved with a jacking frame 242. The top of the jacking frame 242 is connected to the rotatable spliced L-shaped platform 2 through the rotary unit 241.

[0037] A monitorable assembled Y-shaped pier bridge construction platform includes four groups of rotatable spliced L-shaped platforms 2. When not rotating during construction, its state is as Figure 2 shown. The four groups of rotatable spliced L-shaped platforms 2 are arranged on both sides and are located above the driving lane. As Figure 3 shown, the four groups of rotatable spliced L-shaped platforms 2 are rotated respectively and connected end to end in sequence to form a circular platform. The Y-shaped pier 1 is located in the center. The bottom of the Y-shaped pier 1 is fixedly connected to the ground through the pier column foundation cap 11. A large cantilever capping beam 12 is provided at the top of the Y-shaped pier 1.

[0038] A monitoring method for a monitorable assembled Y-shaped pier bridge construction platform includes the following steps:

[0039] 1) Complete relevant components in the factory according to the design drawings, transport the components to the construction site, set the column foundation cap 244 at the designed position, and complete the installation of the column 243, the jacking frame 242, and the rotary unit 241;

[0040] 2) After lifting the standard section 211 of the steel truss to the designed elevation by the lifting device, connect and assemble the standard section 211 of the steel truss with the standard section 211 of the steel truss to form the L-shaped support frame 21;

[0041] 3) Complete the installation of the L-shaped platform 22, the tie beam 23 and the DIC target 25;

[0042] 4) Each rotatable spliced L-shaped platform 2 is provided with a DIC measurement camera. The two DIC targets 25 are adjusted and reduced for errors through the calculated height difference and the angular difference of the straight line formed by the two points, and then the rotational connection between the rotatable spliced L-shaped platforms 2 is carried out;

[0043] 5) Data acquisition: Connect the camera to the control system or the data processing terminal through the wireless local area network to ensure the smooth transmission of data. Secondly, in the camera settings interface, manually or automatically adjust the exposure time and gain value to optimize the brightness and contrast of the image, ensure that the image quality is suitable for subsequent processing, and then apply an appropriate filtering algorithm to perform noise reduction processing on the collected image to reduce the random noise in the image, while retaining the edge details of the image and preventing edge blurring. The monitored target data is used to extract the feature points - the checkerboard angle points by the Canny edge detection algorithm, and then based on the extracted edge information, determine the centroid position of the target, and calculate the internal parameters and distortion parameters of the industrial camera using the actual coordinates and image coordinates of these feature points;

[0044] 6) Data processing and vertical direction matching of control points: According to the actual size L of the calibration target and the number of pixels P occupied by the target in the image, calculate the actual length S represented by a single pixel. Finally, based on the internal parameters, distortion parameters and scale factor S of the industrial camera, construct the vertical coordinate system z of each measurement point in the image. By comparing the changes in the positions of the measurement points in different images, convert them into the actual vertical displacement Δz, so as to realize deflection measurement; The height matching in the vertical plane is ensured by the coordinated measurement of the DIC target and the industrial camera;

[0045] 7) Precise matching of the two end connection points in the horizontal plane: Through the intelligent matching method of splicing control points by the iterative closest point algorithm, assume that N = {n 1 , n 2 , …, n n} and Z = {z 1 , z 2 , …, z n} are two control points to be matched. First, select four non-coplanar points in N as the point basis, so as to determine the point distances d 1 and d 2 , the scale factors r 1 and r 2 and the included angle β. For the points in Z, calculate the distances within [d1 -δ, d 1 [-δ], [d 2 -δ, d 2 Points within [-δ] and incorporate them into point set S 1 , S 2 , where δ is the allowable error value, determined by S 1 , S 2 Determine the intersection coordinate e 1ij , e 2ij , within S 1 and S 2 Search for point set pairs that meet the conditions that e 1ij , e 2ij are approximately equal and the included angle between the two connecting lines is approximately equal to β, so that the four-point bases z 1 , n 2 , …, n n corresponding to the point bases n 1 , z 2 , …, z n , and then obtain the transformation matrix M between N and Z. Since the transformation matrix M can only ensure the minimum matching error of the point bases, the ICP algorithm needs to be used for fine matching. The objective function of the ICP algorithm is

[0046]

[0047] where z i and n i are the pre-connected control point pairs at both ends respectively; n is the center of the splicing control points, and R and T are the rotation matrix and translation matrix respectively. Their matrices can be specifically expressed as:

[0048] R = UV T

[0049]

[0050] W = UΣV T

[0051] μ z and μ n are the coordinate averages of the control point sets at both ends respectively; the diagonal matrix ∑, the left singular matrix U, and the right singular matrix V are all obtained by the singular value decomposition of matrix W. The precise matching of the two-end control connection is achieved through the point set output obtained from the objective function.

Claims

1. A monitorable assembled Y-shaped pier bridge construction platform, located around the Y-shaped pier (1), characterized in that: The invention comprises four groups of rotatable spliced ​​L-shaped platforms (2), which are formed into a ring-shaped platform after being rotated and spliced. The Y-shaped bridge pier (1) is located at the center. Each group of rotatable spliced ​​L-shaped platforms (2) comprises an L-shaped support frame (21), an L-shaped platform (22), a tie beam (23) and a column support structure (24) arranged on the upper surface of the L-shaped support frame (21) for supporting the L-shaped platform (22), and the column support structure (24) is rotatably connected to the L-shaped support frame (21).

2. A monitorable assembled Y-shaped pier bridge construction platform as claimed in claim 1, characterized in that: The column support structure (24) comprises a slewing unit (241), a lifting frame (242), a column (243) and a column foundation support platform (244); the lower end of the column (243) is fixedly connected to the ground via the column foundation support platform (244); the upper end of the column (243) is sleeved with the lifting frame (242); the top of the lifting frame (242) is connected to the rotatable spliced ​​L-shaped platform (2) via the slewing unit (241).

3. A monitorable assembled Y-shaped pier bridge construction platform as claimed in claim 2, characterized in that: The L-shaped support frame (21) comprises steel truss standard sections (211) connected end to end, and a DIC target point (25) is provided on the end of one end of each steel truss standard section (211) and the second vertical beam at the other end.

4. A monitorable assembled Y-shaped pier bridge construction platform as claimed in claim 3, characterized in that: The bottom of the Y-shaped bridge pier (1) is fixedly connected to the ground via a pier column foundation cap (11), and a large cantilever cap beam (12) is provided on the top of the Y-shaped bridge pier (1).

5. A monitoring method for a monitorable assembled Y-shaped pier bridge construction platform as claimed in claim 5, characterized in that: The steps include: 1) Complete the relevant components in the factory according to the design drawings, transport the components to the construction site, set the column foundation pedestal (244) at the designed position, and complete the installation of the column (243), the lifting frame (242) and the slewing unit (241); 2) After the steel truss standard section (211) is lifted to the design elevation by a lifting device, the steel truss standard section (211) is connected and assembled with the steel truss standard section (211) to form an L-shaped support frame (21); 3) completing the installation of the L-shaped platform (22), tie beam (23) and DIC target (25); 4) Each set of rotatable spliced ​​L-shaped platforms (2) is provided with a DIC measurement camera, and two DIC target points (25) are rotatably connected to each other after the error is adjusted and reduced by the calculated height difference and the angle difference of the straight line formed by the two points; 5) Data collection: Connect the camera to the control system or data processing terminal via a wireless LAN to ensure smooth data transmission. Secondly, in the camera setting interface, manually or automatically adjust the exposure time and gain value to optimize the brightness and contrast of the image to ensure that the image quality is suitable for subsequent processing. Then apply an appropriate filtering algorithm to perform noise reduction on the collected image to reduce random noise in the image while retaining the edge details of the image to prevent edge blur. The target data obtained by monitoring uses the Canny edge detection algorithm to extract feature points - chessboard angle points, and then determine the centroid position of the target based on the extracted edge information, and use the actual coordinates of these feature points and the image coordinates to calculate the internal parameters and distortion parameters of the industrial camera; 6) Data processing and vertical matching of control points: According to the actual size L of the calibration target and the number of pixels P occupied by the target in the image, the actual length S represented by the unit pixel is calculated. Finally, based on the internal parameters, distortion parameters and scale factor S of the industrial camera, the vertical coordinate system z of each measuring point in the image is constructed. By comparing the changes in the positions of the measuring points in different images, it is converted into the actual vertical displacement Δz, thereby realizing deflection measurement; Height matching in the vertical plane is ensured by the coordinated measurement of the DIC target and the industrial camera; 7) Accurate matching of the two end connection points in the horizontal plane: Through the intelligent matching method of the splicing control points using the iterative nearest neighbor algorithm, assuming that N = {n1, n2, ..., n n } and Z={z1,z2,…,z n First, four non-coplanar points in N are selected as the point basis for two control points to be matched, so that the point distances d1 and d2, the scale factors r1 and r2, and the angle β can be determined. For the points in Z, the points with distances between [d1-δ, d1-δ] and [d2-δ, d2-δ] are calculated and included in the point set S1, S2, δ is the allowable error value, and the intersection coordinates e are determined by S1 and S2 1ij , e 2ij , search for the match e in S1 and S2 1ij , e 2ij The point sets are approximately equal and the angle between the two connecting lines is approximately equal to β, so that the points that correspond to the point basis n1, n2, ..., n can be intelligently selected. n The corresponding four-point basis z1,z2,…,z n , and then get the transformation matrix M between N and Z. Since the transformation matrix M can only ensure the minimum point-based matching error, the ICP algorithm is required for fine matching. The objective function of the ICP algorithm is where z i With n i are the pre-connected control point pairs at both ends; n is the center of the splicing control points, R and T are the rotation matrix and translation matrix respectively, and the matrices can be specifically expressed as: R=UVT W=UΣVT μ z With μ n are the coordinate averages of the control point sets at both ends respectively; the diagonal matrix ∑, the left singular matrix U and the right singular matrix V are all obtained by the singular value decomposition of the matrix W, and the point set output obtained by the objective function realizes the precise matching of the control connections at both ends.

Images