Linear control method for beam-beam and arch synchronous parallel rotation process of continuous beam arch bridge

Abstract

The invention relates to the technical field of construction control methods, in particular to a linear control method for a beam-beam and arch synchronous parallel rotation process of a continuous beam arch bridge, which comprises the following steps of: constructing a three-dimensional control network covering the full range of a rotation track, arranging monitoring prisms at a cantilever end of a beam body and an arch rib upper chord pipe, and constructing a multi-parameter acquisition system; prism coordinates, wind speed and rotation system stress data are obtained in real time, a dynamic grading early warning mechanism is established according to monitoring data in a rotation state, trial rotation parameters are optimized through a four-stage inching test, a mapping model of a rotation angle and traction force is established, a rotation path is corrected in real time in combination with anti-collision simulation analysis, it is ensured that a closure gap is accurately in place, and the stability of the system is improved. The inching adjustment time is shortened, the sunroof period utilization rate is improved, meanwhile, the major risk is reduced by combining abnormal response with graded early warning, and the construction precision, efficiency, safety and economic benefits are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction control methods, in particular to a linear control method for continuous beam-arch bridge beam and arch synchronous parallel rotation. BACKGROUND

[0002] In the rotation construction of long-span continuous beam-arch bridges in bridge engineering, the traditional technology has the problems of long data collection interval caused by manual measurement with a total station, low night precision and inability to capture dynamic changes, only monitoring a single parameter of angle or displacement without integrated multi-dimensional data linkage analysis of wind speed vibration, relying on manual experience for closure gap adjustment without data support of trial rotation, resulting in long in-place time and easy to exceed the window period, no establishment of a hierarchical early warning system, abnormal response lag, and the rotation trajectory planning does not consider extreme working conditions and the safety margin of the limiting device is insufficient, which is difficult to meet the high-precision linear control requirements of beam and arch synchronous parallel rotation. Therefore, a linear control method for continuous beam-arch bridge beam and arch synchronous parallel rotation is proposed. SUMMARY

[0003] In order to solve the above technical problems in the prior art, the present application provides a linear control method for continuous beam-arch bridge beam and arch synchronous parallel rotation.

[0004] To solve the above technical problems, the present application provides the following technical scheme: a linear control method for continuous beam-arch bridge beam and arch synchronous parallel rotation, comprising the following steps:

[0005] Step S1, a three-dimensional control network covering the full range of the rotation trajectory is constructed, and monitoring prisms are arranged on the cantilever end of the beam and the upper chord tube of the arch rib;

[0006] Step S2, a multi-parameter acquisition system is constructed to obtain prism coordinates, wind speed and rotation system stress data in real time;

[0007] Step S3, a dynamic hierarchical early warning mechanism is established according to the monitoring data under the rotation state;

[0008] Step S4, trial rotation parameters are optimized through four-stage point motion testing, and a mapping model of rotation angle and traction force is established;

[0009] Step S5, the rotation path is corrected in real time by combining anti-collision simulation analysis to ensure accurate positioning of the closure gap.

[0010] Preferably, the step S1 specifically comprises:

[0011] Step S11, two 360° prisms are embedded on the inside of the anti-collision wall at the cantilever end of the rotation pier, and the 360° prisms are anchored with epoxy resin;

[0012] Step S12, 4 roof prism rods are implanted at the arch rib top chord pipe end head shaft position, the implantation depth of the roof prism rod exceeds 50 mm, and the surface of the roof prism rod is subjected to corrosion protection treatment.

[0013] Preferably, the multi-parameter acquisition system in step S2 includes a measurement robot, a wind speed and direction instrument, and a stress sensor, the measurement robot is arranged outside the bridge for acquiring prism three-dimensional coordinates, the wind speed and direction instrument is installed within 10 m of the beam end for monitoring wind load, and the stress sensor is arranged in the concrete below the rotating system. The multi-parameter acquisition system synchronizes the data of the measurement robot, the wind speed instrument, and the stress sensor through an Internet of Things gateway, and the sampling frequency of the multi-parameter acquisition system is ≥5 Hz.

[0014] Preferably, the dynamic grading early warning mechanism established in step S3 specifically includes:

[0015] Step S31, set the rotation angular velocity ≤0.02 rad / min, when reaching 0.9 times the control speed, it is yellow warning;

[0016] When reaching ≥1.0 times the control speed, it is orange warning;

[0017] When the control speed continuously mutates, it is red warning;

[0018] Step S32, based on the C55 concrete strength fck=36 MPa, when the concrete strength strain change value reaches 0.6fck / E, it is yellow warning;

[0019] When the concrete strength strain change value reaches 0.8fck / E, it is orange warning;

[0020] When the concrete strength strain change value reaches 0.9fck / E, it is red warning;

[0021] Step S33, when the orange warning is triggered, the PLC system automatically reduces the traction oil pump displacement by 20%, and when the red warning is triggered, the power supply is cut off.

[0022] Preferably, the specific steps of the four-stage point motion test in step S4 include:

[0023] Step S41, in the four-point motion tests, the elongation of the steel strand for traction is set to 10 mm, 5 mm, 3 mm, and 1 mm, respectively;

[0024] Step S42, in each point motion test, the rotating arc length L, the traction force F, and the inertial displacement rotation angle θ are collected, and the relationship between the rotation angle and the traction force is fitted through the least square method F=0.15θ 2 +2.3L(R 2 ≥0.95).

[0025] Preferably, in the step S41, the four-stage point motion test collects the rotation arc length and traction force curve in the 10mm test stage, monitors the steel strand vibration frequency in the 5mm test stage, establishes the angle and arc length mapping model in the 3mm test stage, and verifies the fine tuning accuracy in the 1mm test stage.

[0026] Preferably, in the step S41, the ANSYS / ABAQUS is used to establish a three-dimensional finite element mapping model, material parameters are input, and wind load and angular velocity are coupled, and an interference detection algorithm is added in the three-dimensional finite element mapping model.

[0027] Preferably, the interference detection algorithm is based on the GJK algorithm, the safety margin is calculated by the GJK algorithm, the safety margin needs to be greater than or equal to 200mm, a warning signal is output when the distance is less than or equal to 300mm, and the emergency brake of the linkage hydraulic system is activated when the distance is less than or equal to 200mm.

[0028] Preferably, the step S4 further comprises a step S43:

[0029] An over-limit limiting system is designed, and the over-limit limiting system calculates the limiting point arc length S, (X, Y) and checks the safety margin D according to the slide radius R, the foot position L and the limiting angle θ:

[0030] S=R*theta*pi / 180;

[0031] (X,Y)=(Rcostheta,Rsinteta);

[0032] D=SQRT[(R-L) 2 +(S-L*theta*pi / 180) 2 ]≥200mm.

[0033] Preferably, the foot position L is the measured distance from the support point of the rotating body structure to the rotation center, and the calculation result needs to be verified by three-dimensional laser scanning.

[0034] Compared with the prior art, the beneficial effects of the present application are as follows:

[0035] 1. The present application shortens the point motion adjustment time by constructing a three-dimensional control network, integrating a multi-parameter intelligent monitoring system, establishing a dynamic hierarchical early warning mechanism, using trial rotation parameter optimization and anti-collision simulation, improves the skylight period utilization rate, and reduces the major risks by combining abnormal response with hierarchical early warning, and improves the construction precision, efficiency, safety and economic benefit. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The flowchart of the present application. DETAILED DESCRIPTION

[0037] The above and other technical features and advantages of the present application will be further explained in connection with the accompanying drawings and embodiments, but the following embodiments are merely preferred embodiments of the present application, and are not all.

[0038] Embodiments:

[0039] As shown in the drawings, the present application provides a continuous beam arch bridge beam arch synchronous parallel rotation process line shape control method, comprising the following steps: Figure 1

[0040] Step S1, a three-dimensional control network covering the full range of the rotation track is constructed, monitoring prisms are arranged on the cantilever end of the beam body and the upper chord tube of the arch rib, and the step S1 specifically comprises:

[0041] Step S11, two 360° prisms are embedded on the inside of the anti-collision wall at the cantilever end of the rotation bridge pier, and the 360° prisms are anchored by epoxy resin;

[0042] Step S12, four crown prism rods are implanted at the shaft position of the end head of the upper chord tube of the arch rib, the implantation depth of the crown prism rod exceeds 50 mm, and the surface of the crown prism rod is subjected to corrosion treatment.

[0043] Step S2, a multi-parameter acquisition system is constructed to obtain prism coordinates, wind speed and rotation system stress data in real time, and the multi-parameter acquisition system in the step S2 comprises a measurement robot, a wind speed and direction instrument and a stress sensor, the measurement robot is arranged outside the bridge for collecting three-dimensional coordinates of the prism, the wind speed and direction instrument is installed within 10 m of the beam end for monitoring wind load, and the stress sensor is arranged in the concrete below the rotation system, the data of the measurement robot, the wind speed instrument and the stress sensor are synchronized through the Internet of Things gateway, and the sampling frequency of the multi-parameter acquisition system is ≥5 Hz.

[0044] Step S3, a dynamic grading early warning mechanism is established according to the monitoring data under the rotation state, and the dynamic grading early warning mechanism in the step S3 specifically comprises:

[0045] Step S31, the rotation angular velocity is set to ≤0.02 rad / min, yellow warning when reaching 0.9 times the control speed;

[0046] Orange warning when reaching ≥1.0 times the control speed;

[0047] Red warning when the control speed continues to mutate;

[0048] Step S32, yellow warning when the concrete strength strain change value reaches 0.6fck / E based on the C55 concrete strength fck=36 MPa;

[0049] Orange warning when the concrete strength strain change value reaches 0.8fck / E;

[0050] ​Red alert when the concrete strength strain change value reaches 0.9fck / E;

[0051] Step S33, when the orange alert is triggered, the PLC system automatically reduces the displacement of the traction oil pump by 20%, and the power source is cut off when the red alert is triggered.

[0052] Step S4, the test parameters are optimized by four-stage point motion test, and a mapping model of rotation angle and traction force is established, and the specific steps of the four-stage point motion test in the step S4 include:

[0053] Step S41, in the four-stage point motion test, the elongation of the steel strand for traction is set to 10mm, 5mm, 3mm and 1mm respectively, the rotation arc length and the traction force curve are collected in the 10mm test stage, the steel strand vibration frequency is monitored in the 5mm test stage, the mapping model of angle and arc length is established in the 3mm test stage, and the fine adjustment accuracy is verified in the 1mm test stage, a three-dimensional finite element mapping model is established by using ANSYS / ABAQUS, material parameters are input and wind load and angular velocity are coupled, and an interference detection algorithm is added in the three-dimensional finite element mapping model;

[0054] Step S42, in each point motion test process, the rotation arc length L, the traction force F and the inertia displacement rotation angle θ are collected respectively, and the relationship between the rotation angle and the traction force is fitted by the least square method F=0.15θ 2 +2.3L(R 2 ≥0.95).

[0055] The step S4 further includes a step S43:

[0056] An over-limit limiting system is designed, and the over-limit limiting system calculates the limiting point arc length S, (X, Y) and checks the safety margin D according to the slide radius R, the foot position L and the limiting angle θ:

[0057] S=R×θ×π / 180;

[0058] (X, Y)=(Rcosθ, Rsinθ);

[0059] D=√[(R-L) 2 +(S-L×θ×π / 180) 2 ]≥200mm.

[0060] The foot position L is the measured distance from the support point of the rotating body structure to the rotation center, and the calculation result needs to be verified by three-dimensional laser scanning.

[0061] The interference detection algorithm is based on the GJK algorithm, the safety margin is calculated by the GJK algorithm, the safety margin needs to be ≥200mm, a warning signal is output when the distance is ≤300mm, and the hydraulic system is braked in emergency when the distance is ≤200mm.

[0062] Step S5, combined with anti-collision simulation analysis real-time correction of the path of rotation, to ensure the precise closure of the mouth.

[0063] The above only describes the preferred embodiments of the present application, which are only illustrative but not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalents can be made to the present application within the spirit and scope defined by the claims of the present application, but all will fall within the protection scope of the present application.

Claims

1. A method for linear control of a continuous beam-arch bridge beam-arch synchronous parallel rotation process, characterized in that, The method comprises the following steps: Step S1, constructing a three-dimensional control network covering the full range of the rotating body track, and arranging monitoring prisms on the cantilever end of the beam body and the upper chord tube of the arch rib; Step S2, constructing a multi-parameter acquisition system to obtain prism coordinates, wind speed and rotating system stress data in real time; Step S3, establishing a dynamic grading early warning mechanism according to the monitoring data under the rotating state; Step S4, optimizing the test rotating parameters through four-stage point dynamic testing, and establishing a mapping model of the rotating angle and the traction force; Step S5, combining the anti-collision simulation analysis to correct the rotating path in real time, and ensuring the accurate positioning of the closure gap.

2. The process line control method for simultaneous parallel rotation of a beam and arch of a continuous beam-arch bridge according to claim 1, wherein The step S1 specifically comprises: Step S11, embedding 2 360° prisms in the inside of the anti-collision wall of the rotating bridge pier cantilever end, and the 360° prisms are anchored by epoxy resin; Step S12, implanting 4 arch prism rods at the shaft position of the end head of the upper chord tube of the arch rib, the implantation depth of the arch prism rod is more than 50 mm, and the surface of the arch prism rod is subjected to corrosion treatment.

3. The process line control method for simultaneous parallel rotation of a beam and arch of a continuous beam-arch bridge according to claim 2, wherein The multi-parameter acquisition system in the step S2 comprises a measuring robot, a wind speed and direction instrument and a stress sensor, the measuring robot is arranged outside the bridge for acquiring three-dimensional coordinates of the prisms, the wind speed and direction instrument is installed within 10 m of the beam end for monitoring the wind load, and the stress sensor is arranged in the concrete below the rotating system; the data of the measuring robot, the wind speed instrument and the stress sensor are synchronized through the Internet of Things gateway, and the sampling frequency of the multi-parameter acquisition system is ≥5 Hz.

4. The process line control method for simultaneous parallel rotation of a beam and an arch of a continuous beam-arch bridge according to claim 2, wherein The dynamic grading early warning mechanism in the step S3 specifically comprises: Step S31, setting the rotating angular velocity ≤0.02 rad / min, and when reaching 0.9 times the control speed, it is yellow warning; when reaching ≥1.0 times the control speed, it is orange warning; when the control speed continuously mutates, it is red warning; Step S32, based on the C55 concrete strength fck=36 MPa, when the concrete strength strain change value reaches 0.6fck / E, it is yellow warning; when the concrete strength strain change value reaches 0.8fck / E, it is orange warning; when the concrete strength strain change value reaches 0.9fck / E, it is red warning; Step S33, when the orange warning is triggered, the PLC system is automatically linked to reduce the displacement of the traction oil pump by 20%, and when the red warning is triggered, the power supply is cut off.

5. The process line control method for simultaneous parallel rotation of a beam and arch of a continuous beam-arch bridge according to claim 4, wherein The specific steps of the four-stage point dynamic testing in the step S4 comprise: Step S41, in the four-stage point dynamic testing, the elongation of the steel strand for traction is set to 10 mm, 5 mm, 3 mm and 1 mm respectively; Step S42, in each time point test process, respectively collect rotation arc length L, traction force F and inertia displacement rotation angle θ, through the least square method F = 0.15 θ 2 + 2.3L(R 2 ≥ 0.95) fitting rotation angle and traction force relationship.

6. The process line control method for simultaneous parallel rotation of a beam and arch of a continuous beam-arch bridge according to claim 5, wherein In the step S41, the four-stage point dynamic testing collects the rotating arc length and the traction force curve in the 10 mm test stage, monitors the steel strand vibration frequency in the 5 mm test stage, establishes the mapping model of the angle and the arc length in the 3 mm test stage, and verifies the fine adjustment accuracy in the 1 mm test stage.

7. The process line control method of simultaneous parallel beam and arch rotation of a continuous beam-arch bridge according to claim 6, wherein In the step S41, a three-dimensional finite element mapping model is established by using ANSYS / ABAQUS, material parameters are input, and wind load and angular velocity are coupled, and an interference detection algorithm is added in the three-dimensional finite element mapping model.

8. The process line control method of simultaneous parallel beam and arch rotation of a continuous beam arch bridge according to claim 7, wherein, The interference detection algorithm is based on the GJK algorithm, the safety margin is calculated by the GJK algorithm, the safety margin needs to be ≥200 mm, when the distance ≤300 mm, an early warning signal is output, and when the distance ≤200 mm, the hydraulic system is linked to emergency brake.

9. The process line control method of simultaneous parallel beam and arch rotation of a continuous beam arch bridge according to claim 1, wherein, The step S4 further comprises a step S43: The over-limit limiting system is designed, and the limiting point arc length S, (X, Y) and the safety margin D are calculated according to the slide radius R, the foot position L and the limiting angle θ through the over-limit limiting system: S=R×θ×π / 180; (X, Y)=(Rcosθ, Rsinθ); D=√[(R-L) 2 +(S-L×θ×π / 180) 2 ]≥200mm。 10. The process line control method of simultaneous parallel rotation of beam and arch of a continuous beam-arch bridge according to claim 9, wherein, The foot position L is the measured distance from the support point of the rotating body structure to the rotation center, and the calculation result needs to be verified by three-dimensional laser scanning.

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