A cable-stayed bridge for high-speed railway with the function of adjusting the bridge deck alignment

Abstract

The present invention discloses a high-speed railway cable-stayed bridge with a function of adjusting the bridge deck alignment. The high-speed railway cable-stayed bridge includes a main girder, bridge towers, bridge piers, stay cables and an alignment control system. The alignment control system includes a monitoring module, a signal transmission module, a data processing module and a stay cable tensioning device. The monitoring module collects bridge response information and environmental information; the signal transmission module transmits data; the stay cable tensioning device controls an oil pump and a motor through a controller, and further controls a hydraulic cylinder to realize the adjustment of the stay cables. By adjusting the cable force and cable length, the present invention offsets the temperature deformation of the bridge, relaxes the stiffness limit of long-span cable-stayed bridges, reduces the construction cost, and has great economic benefits; keeps the bridge alignment stable, creates conditions for laying ballastless tracks on high-speed railway cable-stayed bridges, fundamentally solves the problem of maintaining the smoothness of the track alignment on high-speed railway cable-stayed bridges, and creates operating conditions for high-speed trains running at 350 km / h on cable-stayed bridges.

Description

Technical Field

[0001] The present invention relates to the technical field of high - speed railway cable - stayed bridges, and particularly to a high - speed railway cable - stayed bridge with a function of adjusting the deck alignment. Technical Background

[0002] Due to its reasonable force - bearing performance and strong spanning ability, the cable - stayed bridge has become the main bridge type for high - speed railways spanning large rivers in China; the ballastless track has become the main track form for high - speed railways in China due to its good durability, high smoothness and small maintenance volume. The application of ballastless track on long - span cable - stayed bridges is an important measure for the technological innovation of high - speed railways in China. The application of ballastless track on long - span cable - stayed bridges can unify the track types of the line, eliminate the speed - limit points of the line, and ensure the long - term stable service of the track, which is of great significance for train speed increase and maintaining train operation performance.

[0003] However, the ballastless track has poor adaptability to deformation and high requirements for the stiffness of the lower structure. The long - span cable - stayed bridge has large temperature deformation. For example, the maximum temperature deformation of the Ganjiang Bridge can reach 90.7 mm. High - speed railways have strict requirements for line smoothness. The above factors seriously restrict the application of ballastless track on high - speed railway cable - stayed bridges. At present, some measures have been taken to solve the application problems of ballastless track on high - speed railway cable - stayed bridges, including increasing the bridge stiffness, modifying the evaluation index of line smoothness in the specification, and only attempting to lay ballastless track on high - speed railway cable - stayed bridges at the 400 - m level. The measures to increase the bridge stiffness often require increasing the height of the main girder and the thickness of the top and bottom plates, resulting in waste of materials, increased construction costs, and most of the increased stiffness is used to balance the self - weight of the structure, and the effect on balancing the temperature load is not obvious; modifying the evaluation standard of high - speed railway line smoothness in the specification is not a fundamental solution. None of the above measures have fundamentally solved the problem of laying ballastless track on high - speed railway cable - stayed bridges. The force and deformation of the cable - stayed bridge are directly related to the cable force. By adjusting the cable force and cable length, the force and deformation state of the bridge can be controlled, the temperature deformation of the long - span cable - stayed bridge can be reduced, conditions can be provided for laying ballastless track on high - speed railway cable - stayed bridges, and the line smoothness can be maintained.

[0004] There are great deficiencies in the existing cable adjustment methods. They are mainly applied in the construction stage, aiming to ensure that the deck alignment, cable force, etc. reach the design values after the bridge is completed; mainly for balancing the dead load, the cable adjustment method is simple; manual participation is required and the degree of automation is low; in order to save tensioning equipment, the paired tensioning method is often adopted, which is time - consuming and laborious; the traditional cable adjustment method is not suitable for the automatic adjustment of the deck alignment of the cable - stayed bridge during the operation stage.

[0005] A high-speed railway cable-stayed bridge with the function of adjusting the deck alignment is proposed. By adjusting the cable force and cable length, this high-speed railway cable-stayed bridge realizes the adjustment of the deck alignment during the operation stage, relaxes the stiffness limit of the cable-stayed bridge, breaks through the span limit range for laying ballastless tracks on the cable-stayed bridge, solves the problem of laying ballastless tracks on long-span cable-stayed bridges, and is of great significance for unifying the track form of the whole line, increasing the train speed and improving the driving performance. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a high-speed railway cable-stayed bridge with the function of adjusting the deck alignment. Through the monitoring of the bridge state and environmental state during the operation stage, based on the intelligent cable adjustment algorithm built in the active control system, the cable force is adjusted in real time to maintain the stability of the deck alignment, improve the alignment smoothness of the high-speed railway cable-stayed bridge, ensure the driving safety and riding comfort, and then provide the laying conditions for the ballastless track on the high-speed railway cable-stayed bridge, improve the train operation speed, which is of great significance for the construction of high-speed railways in China.

[0007] The technical solution of the present invention to solve the above technical problems is: a high-speed railway cable-stayed bridge with the function of adjusting the deck alignment, including a main girder, bridge towers, bridge piers, stay cables and a line shape control system. The line shape control system includes a monitoring module, a first signal transmission module, a central processing module, a second signal transmission module and a stay cable tensioning device. The central processing module is composed of an abnormal data processing module, a stay cable adjustment amount calculation module and a stay cable adjustment amount verification module;

[0008] The monitoring module collects bridge response information and environmental information, including temperature and humidity, deck alignment, stresses of the main girder and bridge towers, stay cable force and cable length;

[0009] The first signal transmission module transmits the information collected by the monitoring module to the data processing module for processing;

[0010] The abnormal data processing module included in the central processing module eliminates the abnormal values in the measured data and retains the accurate bridge response information and environmental information; the stay cable adjustment amount calculation module calculates the stay cable adjustment amount based on the built-in cable adjustment algorithm according to the information collected by the sensors; the stay cable adjustment amount verification module establishes a spatial nonlinear analysis model of the cable-stayed bridge based on the finite element algorithm and modifies the model according to the monitoring information of the sensors to verify the correctness of the stay cable adjustment amount;

[0011] The second signal transmission module transmits the stay cable adjustment amount information to the stay cable tensioning device in a wireless communication manner;

[0012] The stay cable tensioning device controls the oil pump and motor through a controller, and then controls the hydraulic cylinder to realize the adjustment of the stay cable.

[0013] Further, the monitoring module of the linear regulation system includes a temperature and humidity monitoring sensor, a linear monitoring sensor, a stress monitoring sensor, and a cable force monitoring sensor.

[0014] The temperature and humidity monitoring sensor used but not limited to a thermometer and hygrometer, is installed at the top of the tower and the mid-span of the main span to monitor the environmental temperature and humidity information and the temperature and humidity information of the bridge structure.

[0015] The linear monitoring sensor used but not limited to a deflection meter, GNSS, and communicating pipe, is installed at key positions such as the mid-span of the main beam and the mid-span of the side span to monitor the linear change information of the bridge deck.

[0016] The stress monitoring sensor used but not limited to a fiber Bragg grating strain gauge, is installed at key positions such as the mid-span of the main beam, the mid-span of the side span, and the bridge tower to monitor the stress change information of the bridge.

[0017] The cable force monitoring sensor used but not limited to a vibrating wire gauge, a magnetic flux sensor, a vibration frequency sensor, and a pressure cell, is installed but not limited to the cable-girder anchorage area and the cable-tower anchorage area to monitor the cable force and cable length change information.

[0018] Further, the stay cable tensioning device of the linear regulation system includes a controller, a variable frequency motor, an oil pump, a hydraulic cylinder, and a sensor; the stay cable tensioning device controls the rotation speed of the variable frequency motor, the output oil volume and output speed of the oil pump according to the stay cable adjustment amount information through the controller, and then controls the hydraulic cylinder to adjust the stay cable force and cable length. The sensor monitors the cable force and cable length during the adjustment process and feeds back to the controller to complete the closed-loop control.

[0019] Further, the signal transmission module of the linear regulation system includes a first signal transmission module and a second signal transmission module; the first signal transmission module is used to collect the monitoring information of the sensor and transmit the information to the central processing module for data analysis and calculation; the second signal transmission module is used to transmit the stay cable adjustment amount output by the central processing module to the stay cable tensioning device for stay cable tensioning operation.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] (1) The present invention realizes the automatic adjustment of the temperature deformation of the high-speed railway cable-stayed bridge in the operation stage. By adjusting the cable force, the temperature deformation of the bridge is offset, the stiffness limit of the long-span cable-stayed bridge is relaxed, and the construction cost is reduced; the linear stability of the bridge deck in the operation stage is maintained, creating conditions for laying ballastless tracks on long-span cable-stayed bridges of high-speed railways, expanding the span range of the application of ballastless tracks on cable-stayed bridges, fundamentally solving the world-class problem of laying ballastless tracks on long-span cable-stayed bridges of high-speed railways, and ensuring the driving safety and riding comfort of high-speed trains.

[0022] , it is of great significance to unify the track form throughout the line, improve the train speed, and maintain the train operation performance.

[0023] (2) The overall synchronous tensioning of the stay cables in the present invention greatly reduces the working procedures, improves the tensioning efficiency; does not require manual participation, with a high degree of automation; the active closed-loop control method has high adjustment accuracy, avoiding the cable force deviation caused by human operation errors.

[0024] (3) The present invention fills the gap that the cable force and cable length in the operation stage of long-span cable-stayed bridges cannot be automatically controlled, and proposes a brand-new automatic control system and control method, providing technical support for the construction of cable-stayed bridges with even larger spans in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a high-speed railway cable-stayed bridge with a function of adjusting the bridge deck alignment according to the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the alignment control system according to the present invention.

[0027] Figure 3 It is a schematic diagram of the active closed-loop control process according to the present invention.

[0028] Figure 4 It is a schematic diagram of the process of adjusting the cables once according to the present invention.

[0029] Figure 5 It is a schematic diagram of the working state of the stay cable tensioning device according to the present invention.

[0030] Figure 6 It is a schematic diagram of the structure of the stay cable tensioning device according to the present invention.

[0031] Reference numerals: 11 - temperature and humidity monitoring sensor, 12 - alignment monitoring sensor, 13 - stress sensor, 14 - cable force sensor, 2 - first signal transmission module, 3 - central processing module, 31 - abnormal data processing module, 32 - stay cable adjustment amount calculation module, 33 - stay cable adjustment amount verification module, 4 - second signal transmission module, 5 - stay cable tensioning device, 51 - PLC controller, 52 - motor and hydraulic oil pump, 53 - oil delivery pipe, 54 - hydraulic cylinder, 6 - main girder, 7 - stay cable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0033] As Figure 1 , Figure 2As shown in the figure, the linear regulation system of the present invention includes a temperature and humidity monitoring sensor 11, a linear monitoring sensor 12, a stress sensor 13, a cable force sensor 14, a first signal transmission module 2, a central processing module 3, a second signal transmission module 4, and a stay cable tensioning device 5. The central processing module 3 includes an abnormal data processing module 31, a stay cable adjustment amount calculation module 32, and a stay cable adjustment amount verification module 33. The temperature and humidity monitoring sensor 11, the linear monitoring sensor 12, the stress sensor 13, and the cable force sensor 14 collect bridge response information and environmental information, including temperature and humidity, bridge deck alignment, main girder and pylon stress, and stay cable force. The first signal transmission module 2 transmits the information collected by the monitoring module to the central processing module 3 for processing. The abnormal data processing module 31 of the central processing module 3 eliminates the abnormal values in the measured data and retains the accurate bridge response information and environmental information. The stay cable adjustment amount calculation module 32 of the data processing module 3 calculates the stay cable adjustment amount according to the information collected by the sensors. The stay cable adjustment amount verification module 33 of the data processing module is based on the finite element algorithm, establishes a spatial nonlinear analysis model of the cable-stayed bridge, and modifies the model according to the monitoring information of the sensors to verify the correctness of the stay cable adjustment amount. The second signal transmission module 4 transmits the stay cable adjustment amount information to the stay cable tensioning device 5 in a wireless communication manner. The stay cable tensioning device 5 controls the oil pump and the motor through a PLC controller, and then controls the hydraulic cylinder to realize the stay cable adjustment.

[0034] In the present invention, sensors are installed on the bridge structure. The main girder linearity monitoring sensors 12 include but are not limited to laser deflection meters, hydrostatic levels, total stations, and GPS. They mainly monitor the deflection changes of the main girder at positions such as the mid-span of the main girder, quarter points, eighth points, and the mid-span of the side span, and convert the monitoring results into readable data and transmit them to the data processing module through the signal output module, so that the stay cable tensioning device can tension and release the stay cables to adjust the deck alignment. The first signal transmission module 2 and the second signal transmission module 4 can achieve data or signal transmission through physical connection or wireless technology, including but not limited to wired communication (electric wire or optical cable) and wireless communication (WiFi, Bluetooth, ZigBee, mobile data communication, LoRa, NB-IoT, etc.) technologies, and are used to transmit data or signals between the monitoring module and the data processing module. The measured data input module of the data processing module can achieve data or signal transmission through physical connection or wireless technology, including but not limited to wired communication (electric wire or optical cable) and wireless communication (WiFi, Bluetooth, ZigBee, mobile data communication, LoRa, NB-IoT, etc.) technologies, and is used to transmit the bridge structure and environmental information collected by the monitoring module to the subsequent modules of the system for processing and analysis. The finite element model analysis module corrects the finite element model of the cable-stayed bridge based on the measured data to make the finite element model more in line with the actual structure and ensure the reliability of the cable adjustment algorithm verification. According to the built-in cable adjustment algorithm, calculate the tension change amounts of each stay cable to maintain the deck alignment, formulate a reasonable tensioning strategy, and verify the reliability through the corrected finite element model. Finally, transmit the tension amounts of each verified stay cable to the subsequent subsystem through the cable adjustment command output module for actual stay cable tensioning operations. The stay cable tensioning device can be divided into four parts according to its functions: control, monitoring, tensioning, and communication. The PLC controller of the tensioning control module receives the stay cable tensioning amount calculated by the data processing module through the wireless communication technology of the communication module. The monitoring data such as the stress and displacement of the stay cable steel strands during the tensioning process are transmitted to the PLC controller through wireless communication for monitoring and control. The PLC controls the oil inlet, outlet oil volume and speed of the hydraulic cylinder according to the monitoring data such as the stay cable length and cable force to achieve the specified tensioning amount of the stay cable. The monitoring module includes a displacement sensor, a hydraulic sensor, and an A / D converter. The sensor and the A / D conversion module transmit signals in a standard current form, and the A / D conversion module is directly connected to the PLC. The tensioning operation module receives the PWM control signal sent by the PLC and drives the hydraulic cylinder through the hydraulic oil pump for tensioning operations.

Claims

1. A cable-stayed bridge for high-speed railways with the function of adjusting the deck alignment, characterized in that It includes a main girder, bridge towers, bridge piers, stay cables and a linear control system. The linear control system includes a monitoring module, a first signal transmission module, a central processing module, a second signal transmission module and a stay cable tensioning device. The central processing module consists of an abnormal data processing module, a stay cable adjustment amount calculation module and a stay cable adjustment amount verification module; The monitoring module collects bridge response information and environmental information, including temperature and humidity, bridge deck alignment, stresses of the main girder and bridge towers, stay cable forces and cable lengths; The first signal transmission module transmits the information collected by the monitoring module to the central processing module for processing; The abnormal data processing module in the central processing module eliminates abnormal values in the measured data and retains accurate bridge response information and environmental information. The stay cable adjustment amount calculation module calculates the stay cable adjustment amount based on the information collected by the sensors according to the built-in cable adjustment algorithm. The stay cable adjustment amount verification module establishes a spatial nonlinear analysis model of the cable-stayed bridge-rail system based on the finite element algorithm and modifies the model according to the monitoring information of the sensors to verify the correctness of the stay cable adjustment amount; The second signal transmission module transmits the stay cable adjustment amount information to the stay cable tensioning device in a wireless communication manner; The stay cable tensioning device controls the oil pump and the motor through a controller, and then controls the hydraulic cylinder to achieve stay cable adjustment.

2. The cable-stayed bridge for high-speed railway with the function of adjusting the bridge deck alignment according to claim 1, characterized in that, The monitoring module in the linear control system includes a temperature and humidity monitoring sensor, a linear monitoring sensor, a stress monitoring sensor and a cable force monitoring sensor; The temperature and humidity monitoring sensor uses, but is not limited to, a thermometer and hygrometer, and is installed at the top of the tower and the mid-span of the main span to monitor environmental temperature and humidity information and bridge structure temperature and humidity information; The linear monitoring sensor uses, but is not limited to, a deflection meter, GNSS, and a communicating pipe, and is installed at key positions in the mid-span of the main girder and the mid-span of the side span to monitor the change information of the bridge deck alignment; The stress monitoring sensor uses, but is not limited to, a fiber Bragg grating strain gauge, and is installed at key positions in the mid-span of the main girder, the mid-span of the side span and the bridge tower to monitor the change information of the bridge stress; The cable force monitoring sensor uses, but is not limited to, a vibrating wire gauge, a magnetic flux sensor, a vibration frequency sensor and a pressure cell, and is installed, but not limited to, the cable-girder anchorage zone and the cable-tower anchorage zone to monitor the change information of the cable force and cable length.

3. A cable-stayed bridge for high-speed railway with the function of adjusting the bridge deck alignment according to claim 1, characterized in that, The stay cable tensioning device of the linear control system includes a controller, a variable frequency motor, an oil pump, a hydraulic cylinder and a sensor; The stay cable tensioning device is installed, but not limited to, the cable-girder anchorage zone, the cable-tower anchorage zone and between the cable-girder anchorage zone and the cable-tower anchorage zone. According to the stay cable adjustment amount information, the controller controls the rotation speed of the variable frequency motor, the output oil volume and output speed of the oil pump, and then controls the hydraulic cylinder to adjust the stay cable force and cable length. The sensor monitors the cable force and cable length during the adjustment process and feeds back to the controller to complete the closed-loop control.

4. A high-speed railway cable-stayed bridge with a function of adjusting the bridge deck alignment according to claim 1, characterized in that, The signal transmission module of the linear control system includes a first signal transmission module and a second signal transmission module; The first signal transmission module is used to collect the monitoring information of the sensor and transmit the information to the central processing module for data analysis and calculation; the second signal transmission module is used to transmit the cable adjustment amount output by the central processing module to the cable tensioning device for cable tensioning operation.

Images