CN-121976474-A - Intelligent monitoring system and method for whole construction process of long-span steel box tied-arch bridge

CN121976474ACN 121976474 ACN121976474 ACN 121976474ACN-121976474-A

Abstract

The invention discloses an intelligent monitoring system and method for the whole construction process of a large-span steel box tied-arch bridge. The system and the method are aimed at the key technical problems in the whole pushing construction, and realize real-time monitoring, accurate analysis and dynamic control on structural linearity, stress, temporary structural stress and multipoint synchronism in the pushing process by integrating sensing monitoring, data acquisition, a pushing construction finite element model shown in fig. 4 and a feedback control module. The invention particularly constructs grading early warning and control logic (as shown in figure 5) in the pushing process, effectively solves the industrial pain points of asynchronous pushing, easy deviation and high safety risk of the wide bridge, and remarkably improves the automation, intelligent level and safety of pushing construction.

Inventors

WANG FAZHI
SU YANG
XIE WENXUAN
TU ZHE
LI DENGWU
ZHOU CHEN
YANG JIANAN
ZHU XUELONG
BAI JIANGUO

Assignees

中交二公局华东建设有限公司
湖北省路桥集团有限公司

Dates

Publication Date: 20260505
Application Date: 20251211

Claims (10)

1. The intelligent monitoring system for the whole construction process of the large-span steel box tied arch bridge is characterized by comprising a sensing monitoring module, a data acquisition and transmission module, a calculation analysis and simulation module and a pre-storage analysis and simulation module, wherein the sensing monitoring module is used for acquiring physical parameters of a construction site, including geometric, stress, cable force and temperature data, key section stresses of a main beam axis, a guide beam line shape, temporary buttress displacement and a steel guide beam, temporary steel support and a main body structure are monitored in a pushing stage, the data acquisition and transmission module is in communication connection with the sensing monitoring module and is used for receiving and transmitting the physical parameters, the calculation analysis and simulation module is in communication connection with the data acquisition and transmission module, the calculation analysis and simulation module is pre-stored with a bridge construction whole process simulation model, the simulation model is a pushing construction finite element model comprising a main arch, a main beam, a steel guide beam and a temporary steel support and is used for conducting simulation, error analysis, stability assessment and state prediction in the pushing construction stage, and the feedback control and simulation module is in communication connection with the calculation analysis and simulation module and is used for generating pushing synchronization adjustment, deviation correction and safety instruction and early warning and triggering according to analysis results.
2. The system of claim 1, wherein the sensing and monitoring module comprises a geometric monitoring unit provided with a total station and a precision level for measuring three-dimensional coordinates of a main beam and a main arch control point, a stress monitoring unit provided with a vibrating wire strain gauge, a cable force monitoring unit provided with a cable force measuring instrument for measuring cable force of a hanging rod, and a temperature monitoring unit provided with a temperature sensor for measuring structural temperature and environmental temperature, wherein the vibrating wire strain gauge is arranged on a steel guide beam, a temporary steel support and a key section of the main arch and the main beam which are stressed in the pushing process.
3. The system of claim 1, wherein the computational analysis and simulation module performs a computational analysis of the strength, stiffness and stability of the steel guide beam and temporary steel support during the pushing process.
4. The system of claim 1, wherein the feedback control and early warning module comprises a three-stage early warning mechanism that dynamically triggers different levels of early warning and treatment measures during the pushing process based on comparison of monitored data of axis misalignment, structural stress, temporary buttress reaction to a threshold.
5. The system of claim 1, wherein the construction adjustment command core generated by the feedback control and early warning module comprises a pushing synchronicity adjustment command, a transverse deviation correction command and a pushing step suspension/continuation command, wherein the pushing synchronicity adjustment command is generated by a hierarchical control logic shown in fig. 5 based on monitoring data of axis deviation, deflection of a guide beam and structural stress.
6. A construction monitoring method using the system of any one of claims 1-5, wherein the method centers pushing process monitoring, comprising the steps of: S1, a preliminary preparation stage, namely building a construction control finite element model shown in FIG 4, determining theoretical control target values of each construction stage, and finishing on-site layout of a sensing monitoring module; S2, in the real-time data acquisition stage, in the key working procedure of bridge construction, particularly in a plurality of circulating steps of integral pushing, main beam axis, guide beam line shape, temporary buttress state and key section stress data are acquired at high frequency; S3, inputting the data acquired in real time into a calculation analysis and simulation module, comparing the data with a theoretical calculation result of a model shown in FIG 4, identifying errors and evaluating a structural state, wherein the stage is used for carrying out error analysis and structural safety evaluation under pushing working conditions; S4, a feedback control stage, namely generating and issuing a construction control instruction according to an analysis result to dynamically adjust construction, wherein the core of the stage is to dynamically intervene and adjust the synchronism, the linearity and the safety state of the pushing process; And S5, repeating the steps S2 to S4 until pushing construction is successfully completed.
7. The method of claim 6, wherein in step S2, the key process is based on integral pushing and includes main girder main arch assembly, system conversion and bridge deck pavement.
8. The method of claim 6, wherein in step S3, the error analysis includes comparing the measured beam axis misalignment with theoretical and standard allowable values (10 mm or less) during the pushing stage.
9. The method according to claim 6, wherein in step S4, when the deviation of the main beam axis, the stress of the guide beam or the reaction force of the temporary buttress is detected during the pushing process, the system generates and executes a series of instructions from adjusting the pushing speed, activating the transverse deviation correction to emergency stop pushing according to the hierarchical control logic shown in fig. 5.
10. The method of claim 6, wherein the stability check is performed on the steel guide beam and the temporary steel support by the calculation, analysis and simulation module before and during the pushing construction, so as to ensure the structural integrity stability of the pushing process.

Description

Intelligent monitoring system and method for whole construction process of long-span steel box tied-arch bridge Technical field: The invention belongs to the technical field of construction monitoring in bridge engineering construction, and particularly relates to an overall process and multi-parameter intelligent monitoring system and method of a large-span steel box tied arch bridge under a complex construction process (such as integral pushing). The background technology is as follows: the large-span steel box tied arch bridge has increasingly wide application in traffic engineering due to the advantages of light structure, attractive appearance, large spanning capacity and the like. The bridge adopts a construction method of factory manufacture, field assembly and integral pushing, and the construction process is a dynamic process with a structural system and continuously changing load state. In the process, the internal force and the linear state of the structure directly influence the bridge forming quality and the construction safety. At present, the traditional construction monitoring method has the following limitations: 1. And the data discretization is to measure the parameters such as line shape, stress and the like by adopting an independent instrument, and the data lack linkage analysis, so that the comprehensive judgment of the structural state is difficult to form. 2. Feedback lag, namely the processing and analysis of the monitoring data often depend on manual work, construction cannot be guided in real time, delay exists in deviation correcting measures, and error accumulation can be caused. 3. The method has the defect of poor predictability, namely, the method lacks accurate prediction and early warning linked with monitoring data of a main structure for key problems of stress safety of temporary structures (such as guide beams and temporary buttresses) in the pushing process, time selection of system conversion and the like. 4. The system is lack of a closed-loop control system integrating real-time monitoring, intelligent analysis, dynamic prediction and feedback control, and especially lack of an automatic control strategy aiming at sensitive factors such as temperature effect, pushing synchronism and the like. In the integral pushing construction process, the upper structure and the guide beam are continuously changed, the stress state of the temporary buttress is complex, the main beam is disturbed up and down, torsion can occur in a plane, and the control of the line shape and the synchronism is extremely difficult. If the monitoring is improper, the structural linear deviation, the stress overrun and even the safety accident are easily caused. Therefore, a system and a method for realizing the whole process, intelligentization and high-precision monitoring are urgently needed in the field so as to ensure that the bridge construction is safely and accurately designed into a bridge state. The invention comprises the following steps: To achieve the object of the invention The invention aims to provide an intelligent monitoring system and method for the whole construction process of a large-span steel box tied arch bridge, which aims to solve the problems of structural safety, linear precise control and multipoint synchronism in integral pushing construction and ensure construction safety and bridge forming precision. The technical proposal of the invention In order to achieve the above purpose, the present invention adopts the following technical scheme: in a first aspect, the invention provides an intelligent monitoring system for the whole construction process of a large-span steel box tied-arch bridge, which is characterized in that the system is particularly suitable for monitoring the whole pushing construction and comprises: the sensing monitoring module is used for collecting physical parameters of a construction site and comprises the following components: The geometric monitoring unit is configured with a total station and a precise level and is used for measuring three-dimensional coordinates of the main beam and the main arch control point; The stress monitoring unit is provided with vibrating wire strain gauges which are arranged on arch feet, arch crown sections of the main arch and key stress sections of the main girder; the cable force monitoring unit is provided with a cable force dynamic measuring instrument based on the random vibration principle of the environment and is used for measuring the cable force of the hanging rod; and a temperature monitoring unit configured with a semiconductor temperature sensor for measuring a structural temperature and an ambient temperature. The geometrical monitoring unit performs high-frequency rechecking on the axis of the main beam, the line shape of the guide beam and the displacement of the temporary buttress before and after the key working condition of the pushing in order to precisely control the pushing process, and the st