Pushing bridge vertical curve control adaptive algorithm

Abstract

The application relates to a control adaptive algorithm for a vertical curve of a pushing bridge, which comprises support points with n temporary piers arranged in the range of a support beam body in the bridge direction; in a key working condition, the elevations of the support points are calculated to adjust the corresponding support point elevations; in a non-key working condition, the lifting-off heights of the support points are calculated to adjust the corresponding support point elevations. The application provides a control adaptive algorithm for a vertical curve of a pushing bridge, which adopts different algorithms for the support point elevations according to different working conditions in the bridge pushing process; in the key working condition, the elevations of the support points are calculated as adjustment instructions, the influence of the support point settlement can be eliminated, the falling pushing reaction force of the beam body is uniform and controllable, in the non-key working condition, the lifting-off heights of the support points are calculated as adjustment instructions, the measuring method is simple and fast, the combination of the two algorithms ensures that the vertical curve of the beam body in different postures is consistent with the target vertical curve, the falling pushing reaction force is reasonably controlled, and the efficiency, quality and safety of the bridge pushing construction are considered.

Description

Technical Field

[0001] This application relates to the field of bridge engineering technology, and in particular to an adaptive algorithm for vertical curve control of a jacking bridge. Background Technology

[0002] The walking-type multi-point jacking construction technique is mostly used for large and long bridges with complex vertical curves at the bottom of the beam. According to the changes in the beam's posture, the walking-type multi-point jacking construction technique is divided into two categories. One is translational jacking, in which the beam's jacking posture is always maintained on the vertical curve of the assembly and moves in parallel. The other is rigid body rotation jacking, in which, to ensure the guide beam is smoothly placed on the pier and to avoid excessive height of the support pads, the beam is actively controlled to make rigid body rotation in the planes along the bridge direction and vertical direction. This method is mostly used when the beam bottom has steps, the vertical curve has a large height difference, or the beam is dropped with a large height difference.

[0003] During the step-by-step multi-point jacking construction process, both of the above-mentioned processes require adjusting the elevation of each support point to ensure that the vertical curve of the beam jacking matches the vertical curve of the assembly, so that the jacking reaction force and the jacking reaction force are consistent, and the structural stress is safe and controllable.

[0004] Currently, when adjusting the elevation of the shims at each support point, the process often involves drawing on CAD, measuring data for each support pier individually on the CAD drawing, and then reading the elevation of the shims at each support pier on the construction site. This calculation process is complicated and results in low efficiency for bridge jacking construction. Summary of the Invention

[0005] This application provides an adaptive algorithm for vertical curve control of a jacking bridge to solve the technical problem in related technologies where adjusting the elevation of each support pad during multi-point jacking leads to a complex calculation process and low jacking construction efficiency.

[0006] This application provides an adaptive algorithm for vertical curve control of a jacking bridge, the adaptive algorithm for vertical curve control of a jacking bridge includes:

[0007] Within the range of the supporting beams along the longitudinal direction, the bridge has n temporary piers.

[0008] In critical operating conditions, calculate the elevation of each support point shim to adjust the corresponding support point shims.

[0009] In non-critical operating conditions, calculate the height of the lifting pad at each support point to adjust the corresponding support pad.

[0010] In some embodiments, calculating the elevation of each support point during critical operating conditions includes:

[0011] Two measuring points are set up, namely the first measuring point and the second measuring point;

[0012] During the jacking of the beam, the coordinates of the bridge position along the bridge direction at the first measuring point and the second measuring point are measured and recorded as X1 and X2, respectively.

[0013] During the jacking of the beam, the coordinates of the bridge position along the bridge direction at n support points (denoted as Di, i = 1, 2, ..., n) are measured and denoted as X. Di =(X D1 X D2 , ..., X Dn D1 is the outermost support point within the range of the supporting beam. n The foremost support point within the range of the beam body;

[0014] During the beam jacking process, the measurement is performed at the foremost support point D within the range of the supporting beam. n The elevation of the fulcrum at the last fulcrum D1 and the fulcrum elevation at the last fulcrum are respectively denoted as Z. Dn and Z D1 ;

[0015] Calculate the corresponding fulcrum elevation Z. Di .

[0016] In some embodiments, when (X1-X Di When X1 ∈ [0, X2], determine the support point Di within the range of the supporting beam.

[0017] The corresponding fulcrum elevation Z is... Di The calculation formula is:

[0018]

[0019] Where f(x) is the linearity function of the vertical curve of the main beam and guide beam assembly; ΔZ Dn ΔZ is the difference between the measured elevation of the foremost support point and the elevation of the assembled vertical curve at that point; D1 ΔZ is the difference between the measured elevation of the final support point and the elevation of the assembled vertical curve at that point. Di This is the difference between the measured elevation of other effective support points and the elevation of the corresponding assembled vertical curve.

[0020] In some embodiments, the first measuring point is located at the end of the guide beam, and the second measuring point is located at the end of the main beam.

[0021] In some embodiments, before the beam is jacked up, the initial values ​​of the bridge position coordinates along the bridge direction at the first measuring point and the second measuring point are measured.

[0022] In some embodiments, calculating the detachment height of each support pad under non-critical operating conditions includes:

[0023] During the jacking of the beam, the coordinates of the bridge position along the bridge direction at n support points (denoted as Di, i = 1, 2, ..., n) are measured and denoted as X.Di =(X D1 X D2 , ..., X Dn D1 is the outermost support point within the range of the supporting beam. n The foremost support point within the range of the beam body;

[0024] Given the foremost support point D within the range of the supporting beam. n The height of the detachment of the support pad at the last fulcrum D1 and the height of the detachment of the support pad are denoted as Δh. Dn and Δh D1 ;

[0025] Calculate the height Δh of the pad detachment at other support points. Di .

[0026] In some embodiments, the other fulcrum pad detachment height Δh Di The calculation formula is:

[0027]

[0028] In some embodiments, the X Di The coordinates of the bridge location along the bridge direction at the center of the fulcrum are given.

[0029] In some embodiments, the key working conditions include at least the following: large cantilever guide beam on pier, alignment adjustment before the assembly of the next beam segment, structural stress control, large settlement of temporary pier support, and rotation or beam dropping of rigid body with large height difference.

[0030] In some embodiments, the non-critical operating conditions include at least translational jacking, rigid body rotation with a small height difference, or beam dropping.

[0031] The beneficial effects of the technical solution provided in this application include:

[0032] This application provides an adaptive algorithm for controlling the vertical curve of a bridge jacking project. Different algorithms are used for fulcrum measurement based on different working conditions during the bridge jacking process. In critical conditions, the fulcrum elevation is calculated and used as an adjustment command, eliminating the influence of fulcrum settlement and ensuring uniform and controllable reaction force of the bridge beam upon jacking. In non-critical conditions, the fulcrum clearance height is calculated and used as an adjustment command. The measurement method is simple and quick. The combined application of these two methods ensures that the jacking vertical curve of the bridge beam remains consistent with the target vertical curve under different postures, reasonably controlling the reaction force upon jacking, and balancing the efficiency, quality, and safety of bridge jacking construction. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the detachment height of the fulcrum pad in one embodiment of the present invention.

[0035] Figure 2 This is a structural schematic diagram of the support point location of a bridge in one embodiment of the present invention.

[0036] Figure label:

[0037] 1. Guide beam; 11. First measuring point; 2. Main beam; 21. Second measuring point; 3. Temporary pier. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] This application provides an adaptive algorithm for controlling the vertical curve of a bridge under jacking, applicable to various situations such as integral jacking, segmented jacking, translational jacking, and rigid body rotation jacking.

[0040] An adaptive algorithm for vertical curve control of a launching bridge includes:

[0041] Within the range of the supporting beams along the longitudinal direction, the bridge has n temporary piers.

[0042] In critical operating conditions, calculate the elevation of each support point shim to adjust the corresponding support point shims.

[0043] In non-critical operating conditions, calculate the height of the lifting pad at each support point to adjust the corresponding support pad.

[0044] This application provides an adaptive algorithm for controlling the vertical curve of a bridge jacking project. Different algorithms are used for fulcrum measurement based on different working conditions during the bridge jacking process. In critical conditions, the fulcrum elevation is calculated and used as an adjustment command to eliminate the influence of fulcrum settlement and ensure uniform and controllable reaction force of the beam upon jacking. In non-critical conditions, the fulcrum clearance height is calculated and used as an adjustment command. The measurement method is simple and quick. The combined application of these two methods ensures that the jacking vertical curve of the beam remains consistent with the target vertical curve under different postures, reasonably controlling the reaction force upon jacking, and balancing the efficiency, quality, and safety of bridge jacking construction.

[0045] In some embodiments, the key working conditions include at least the following: large cantilever guide beam on pier, alignment adjustment before the assembly of the next beam segment, structural stress control, large settlement of temporary pier support, and rotation or beam dropping of rigid body with large height difference.

[0046] In some embodiments, non-critical operating conditions include at least translational jacking, rigid body rotation with small elevation difference, or beam dropping.

[0047] In some embodiments, during critical operating conditions, calculating the elevation of each support point includes:

[0048] Two measuring points are set up, namely the first measuring point and the second measuring point;

[0049] During the jacking of the beam, the coordinates of the bridge position along the bridge direction at the first and second measuring points are measured and recorded as X1 and X2, respectively.

[0050] During the jacking of the beam, the coordinates of the bridge position along the bridge direction at n support points (denoted as Di, i = 1, 2, ..., n) are measured and denoted as X. Di =(X D1 X D2 , ..., X Dn D1 is the outermost support point within the range of the supporting beam. n The foremost support point within the range of the beam body;

[0051] During the jacking of the beam, measure the foremost support point D within the range of the supporting beam. n The elevation of the fulcrum at the last fulcrum D1 and the fulcrum elevation at the last fulcrum are respectively denoted as Z. Dn and Z D1 ;

[0052] Calculate the corresponding fulcrum elevation Z. Di .

[0053] In some embodiments, when (X1-X Di When X1 ∈ [0, X2], determine the support point Di within the range of the supporting beam.

[0054] The corresponding fulcrum elevation Z is... Di The calculation formula is:

[0055]

[0056] Where f(x) is the linearity function of the vertical curve of the main beam and guide beam assembly; ΔZ Dn ΔZ is the difference between the measured elevation of the foremost support point and the elevation of the assembled vertical curve at that point; D1 ΔZ is the difference between the measured elevation of the final support point and the elevation of the assembled vertical curve at that point. Di This is the difference between the measured elevation of other effective support points and the elevation of the corresponding assembled vertical curve.

[0057] In the vertical curve alignment function f(x) for assembling the main beam and guide beam, the direction of jacking along the bridge is positive, and the origin is located at the bottom plate of the front end of the guide beam. The assembly elevation of the bridge and guide beam bottom at point X is calculated by the vertical curve alignment function f(x) for assembling the main beam and guide beam. f(x) is obtained by superimposing the design alignment and the pre-camber of the assembly, which is existing technology and will not be elaborated here.

[0058] The above scheme allows for the rapid and accurate calculation of the shim elevations of each support point under different postures of the beam during the jacking process. This is achieved by measuring the bridge position coordinates along the bridge direction at the first measuring point, the second measuring point, and n support points, as well as the shim elevations of the foremost support point Dn and the last support point D1 within the support beam range. This simplifies the calculation process, increases calculation efficiency, and eliminates the influence of support point settlement in the shim measurement results, ensuring that the reaction force of the beam upon jacking is uniform and controllable.

[0059] In some embodiments, the first measuring point is located at the end of the guide beam, and the second measuring point is located at the end of the main beam. The placement of the first and second measuring points at both ends provides greater precision.

[0060] In some embodiments, before the beam is jacked up, the initial values ​​of the bridge position coordinates along the bridge direction at the first and second measuring points are measured to facilitate the estimation of the jacking workload.

[0061] The measurement is carried out by setting out points using a level or other elevation measuring instrument.

[0062] like Figure 1 As shown, Figure 1 This is a schematic diagram of the detachment height of the fulcrum pad in one embodiment of the present invention.

[0063] The clearance height of the support pads is the clearance height from the top surface of the support pads on temporary pier 3 to the bottom surface of the beam when the beam is lifted by the jacks. During rigid body rotation, the theoretical values ​​of the clearance heights of the other support pads are determined based on the clearance heights of the foremost and end supports of the supporting beam, ensuring that the vertical curve shape of the beam remains consistent with the target vertical curve shape during rotation. In this state, the jacking reaction force and the jacking reaction force will also be consistent. The clearance height is measured in centimeters, and the measurement method is simple and quick, such as using a steel ruler.

[0064] In some embodiments, under non-critical operating conditions, calculating the detachment height of the pad at each support point includes:

[0065] During the jacking of the beam, the coordinates of the bridge position along the bridge direction at n support points (denoted as Di, i = 1, 2, ..., n) are measured and denoted as X. Di =(X D1 X D2 , ..., X Dn D1 is the outermost support point within the range of the supporting beam. n The foremost support point within the range of the beam body;

[0066] When the rigid body rotates, given the foremost support point D within the range of the supporting beam... n The height of the detachment of the support pad at the last fulcrum D1 and the height of the detachment of the support pad are denoted as Δh. Dn and Δh D1 ;

[0067] Calculate the height Δh of the pad detachment at other support points. Di .

[0068] In some embodiments, the height Δh of the other fulcrum pad is removed. Di The calculation formula is:

[0069]

[0070] That is, the height of each support point detached before the rigid body of the beam rotates is calculated according to Δh. Di To make a copy.

[0071] In some embodiments, X Di The coordinates of the bridge location along the bridge direction at the center of the fulcrum are given.

[0072] The following is a specific example for illustration.

[0073] like Figure 2 As shown, Figure 2 This is a structural schematic diagram of the support point location of a bridge according to one embodiment of the present invention. The arrows in the diagram represent the direction of jacking.

[0074] An adaptive algorithm for vertical curve control of a launching bridge includes:

[0075] Step S1: Within the range of the supporting beams along the longitudinal direction of the bridge, the bridge is equipped with 6 temporary piers, which are denoted as D1, D2, D3, D4, D5, and D6 respectively.

[0076] Step S2: Under critical operating conditions, calculate the elevation of each support point.

[0077] Specifically, it includes:

[0078] Two measuring points are set up: the first measuring point 11 located at the end of the guide beam 1, and the second measuring point 21 located at the end of the main beam 2.

[0079] Before the beam is launched, the initial coordinates of the bridge location along the bridge direction at the first measuring point 11 and the second measuring point 21 are measured and recorded as X. 01 and X 02 .

[0080] During the jacking of the beam, the coordinates of the center of the six support points (denoted as Di, i = 1, 2, ..., n = 6) along the bridge direction are measured and denoted as X. Di =(X D1 X D2 , ..., X Dn =X D6 D1 is the outermost support point within the range of the supporting beam. n =D6 is the foremost support point within the range of the supporting beam.

[0081] During the jacking of the beam, the coordinates of the bridge position along the bridge direction at the first measuring point 11 and the second measuring point 21 are measured and recorded as X1 and X2, respectively.

[0082] During the jacking of the beam, measure the foremost support point D within the range of the supporting beam. n The elevation of the fulcrum at the last fulcrum D1 and the fulcrum elevation at the last fulcrum are respectively denoted as Z. Dn and Z D1 ;

[0083] The measurement results of the fulcrum and measuring points are shown in Table 1.

[0084] Table 1 Measurement results of fulcrum and measuring points

[0085]

[0086]

[0087] When (X1-X) Di When X1 ∈ [0, X2], determine the support point Di within the range of the supporting beam.

[0088] The corresponding fulcrum elevation Z is... Di The calculation formula is:

[0089]

[0090] Where f(x) is the linearity function of the vertical curve of the main beam and guide beam assembly; ΔZ Dn ΔZ is the difference between the measured elevation of the foremost support point and the elevation of the assembled vertical curve at that point; D1 ΔZ is the difference between the measured elevation of the final support point and the elevation of the assembled vertical curve at that point. DiThis is the difference between the measured elevation of other effective support points and the elevation of the corresponding assembled vertical curve.

[0091] In the vertical curve alignment function f(x) for assembling the main beam and guide beam, the direction of jacking along the bridge is positive, and the origin O is located at the bottom plate of the front end of the guide beam. The assembly elevation of the bridge and guide beam bottom at X is calculated by the vertical curve alignment function f(x) for assembling the main beam and guide beam. f(x) is obtained by superimposing the design alignment and the pre-camber of the assembly.

[0092] The calculation results are shown in Table 2.

[0093] Table 2 Calculation Results

[0094]

[0095]

[0096] Step S3: Under non-critical operating conditions, calculate the height of the pad detachment at each support point.

[0097] Specifically, it includes:

[0098] During the jacking of the beam, the coordinates of the bridge location along the bridge direction at the six support points (denoted as Di, i = 1, 2, ..., 6) are denoted as X. Di =(X D1 X D2 , ..., X D6 The measurement results are shown in Table 1.

[0099] When the rigid body rotates, given the foremost support point D within the range of the supporting beam... n The height of the detachment of the support pad at the last fulcrum D1 and the height of the detachment of the support pad are denoted as Δh. Dn and Δh D1 The results are shown in Table 1.

[0100] Calculate the height Δh of the pad detachment at other support points. Di .

[0101] Other fulcrum pad lifting height Δh Di The calculation formula is:

[0102]

[0103] The results are shown in Table 2.

[0104] The calculation results in Table 2 are used as adjustment instructions for the corresponding support points on site, ensuring that the height of the support points during the jacking process is consistent with the target vertical curve, which is quick and accurate.

[0105] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the method or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0106] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0107] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An adaptive algorithm for vertical curve control of a jacking bridge, characterized in that, The adaptive algorithm for vertical curve control of the jacking bridge includes: Within the range of the supporting beams along the longitudinal direction, the bridge has n temporary piers. In critical operating conditions, calculate the elevation of each support point shim to adjust the corresponding support point shims. In non-critical operating conditions, calculate the height of the lifting pad at each support point to adjust the corresponding support pad. The calculation of the shim elevation at each support point under critical operating conditions includes: Two measuring points are set up, namely the first measuring point (11) and the second measuring point (21); During the jacking of the beam, the coordinates of the bridge position along the bridge direction at the first measuring point (11) and the second measuring point (21) are measured and recorded as X1 and X2 respectively; During the jacking of the beam, the coordinates of the bridge position along the bridge direction at n support points are measured and denoted as X. Di = (X D1 X D2 ..., X Dn The n support points are represented as Di, i=1,2,...,n, where D1 is the last support point within the range of the supporting beam, and Dn is the first support point within the range of the supporting beam. During the jacking of the beam, the elevation of the support pads at the foremost support point Dn and the last support point D1 within the range of the supporting beam is measured and recorded as Z. Dn and Z D1 ; Calculate the corresponding fulcrum elevation. ; when At that time, determine the support point Di within the range of the supporting beam; The corresponding fulcrum elevation is... The calculation formula is: ； Wherein, f(x) is the linearity function of the vertical curve of the main beam and guide beam assembly; The difference between the measured elevation of the foremost support point and the elevation of the assembled vertical curve at that point; The difference between the measured elevation of the last support point and the elevation of the assembled vertical curve at that point; The difference between the measured elevation of other effective support points and the elevation of the corresponding assembled vertical curve; The calculation of the detachment height of the pad at each support point under non-critical operating conditions includes: Given the support pad clearance heights of the foremost support point Dn and the last support point D1 within the range of the supporting beam, denoted as... and ; Calculate the height of the pad detachment at other fulcrums. ; The calculation formula is: .

2. The adaptive algorithm for vertical curve control of a jacking bridge as described in claim 1, characterized in that, The first measuring point (11) is located at the end of the guide beam (1), and the second measuring point (21) is located at the end of the main beam (2).

3. The adaptive algorithm for vertical curve control of a jacking bridge as described in claim 1, characterized in that, Before the beam is pushed forward, the initial values ​​of the bridge position coordinates along the bridge direction at the first measuring point (11) and the second measuring point (21) are measured.

4. The adaptive algorithm for vertical curve control of a jacking bridge as described in claim 1, characterized in that, The key operating conditions include at least the following: large cantilever guide beam on the pier, alignment adjustment before the assembly of the next beam segment, structural stress control, large settlement of temporary pier support, large height difference rigid body rotation or large height difference beam drop.

5. The adaptive algorithm for vertical curve control of a jacking bridge as described in claim 1, characterized in that, The non-critical working conditions include at least translational jacking, rigid body rotation with a small height difference, or beam dropping with a small height difference.

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