CN-122020803-A - Construction monitoring method for pouring large-span bridge cantilever

Abstract

The invention discloses a construction monitoring method for pouring a cantilever of a large-span bridge, and relates to the technical field of bridge design monitoring. The bridge construction method comprises the steps of S1, collecting data information of the whole bridge construction process, carrying out three-dimensional modeling, simulation analysis and rechecking on a bridge structure by utilizing finite element software, S2, utilizing the finite element software to establish a construction monitoring system, combining the finite element model of the bridge structure with actual monitoring data, S3, carrying out real-time analysis on the monitoring data by utilizing the finite element software, timely sending out early warning when the actual monitoring data exceeds a preset monitoring index range, providing corresponding adjustment measures, and finally providing a monitoring report of the cantilever pouring process, and S4, carrying out bridge formation state measurement and submitting a bridge formation monitoring report by utilizing the finite element software after bridge formation. The invention establishes the finite element model to simulate and analyze the construction stage of the structure, and can provide reliable guarantee for bridge safety construction and operation maintenance through analyzing and processing on-site monitoring data.

Inventors

• FENG SICHAO
• LUO ZHIWEI
• BI ZHANGLONG
• SHEN JIE
• Xuan Xinpeng
• LIU QIANG
• YANG WEIFENG
• ZHANG HUAMING
• LEI XIAOBIN
• XU CHANGFEI
• LIU HUI
• ZHAO BIN
• ZHANG HUA
• CHEN QINGYUN

Assignees

• 中铁一局集团第八工程有限公司
• 中铁一局集团有限公司
• 中铁一局集团桥梁工程有限公司

Dates

Publication Date

20260512

Application Date

20260212

Claims (6)

1. 1. The construction monitoring method for pouring the large-span bridge cantilever is characterized by comprising the following steps of: S1, collecting data information of the whole bridge construction process, performing three-dimensional modeling on a bridge structure by utilizing finite element software to obtain a finite element model of the bridge structure, performing simulation analysis on the finite element model of the bridge structure to obtain a simulation analysis result, and finally performing rechecking on the finite element model of the bridge structure; s2, building a construction monitoring system by utilizing finite element software, combining a finite element model of a bridge structure with actual monitoring data, monitoring each cantilever pouring stage in real time, and comparing the actual detection data with preset monitoring indexes; s3, analyzing the monitoring data in real time through finite element software, sending out early warning in time when the actual monitoring data exceeds the preset monitoring index range, and providing corresponding adjustment measures, and finally, sending out monitoring reports of the cantilever pouring process at each stage; And S4, after bridging, using finite element software to measure the bridging state and submitting a bridging monitoring report.
2. 2. The construction monitoring method for pouring a large-span bridge cantilever according to claim 1, wherein when simulation analysis is performed in S1, a check calculation is performed on the whole construction process to check the whole construction process data.
3. 3. The construction monitoring method for pouring a large-span bridge cantilever according to claim 2, wherein, And S1, after simulation analysis is carried out, a finite element model of the bridge structure is rechecked, and the feasibility of the whole construction process is evaluated.
4. 4. The construction monitoring method for pouring a large-span bridge cantilever according to claim 3, wherein the three-dimensional modeling of the bridge structure is performed by MIDAS CIVIL finite element software in S1, and the finite element model of the bridge structure is checked by Ansys software.
5. 5. The construction monitoring method for pouring the large-span bridge cantilever according to claim 1, wherein the simulation analysis in the step S1 mainly comprises the steps of providing installation coordinates in the girder cantilever assembling process, calculating, analyzing and making closure comments on the girder closure process.
6. 6. The construction monitoring method for pouring a large-span bridge cantilever according to claim 1, wherein, The actual detection data in S2 includes, but is not limited to, girder line shape, pier misalignment, stress and girder axis misalignment.

Description

Construction monitoring method for pouring large-span bridge cantilever Technical Field The invention belongs to the technical field of bridge design monitoring, and particularly relates to a construction monitoring method for pouring a large-span bridge cantilever. Background In recent years, effective construction control is required in cantilever pouring construction, so that smooth construction and internal force of a bridge structure in a bridge formation state are ensured, and the line shape meets the design requirement. And establishing a finite element model to simulate and analyze the construction stage of the structure, and providing reliable guarantee for bridge safety construction and operation maintenance through analysis and processing of on-site monitoring data. Cantilever casting refers to a construction method for arranging working platforms on two sides of a pier, casting a cement concrete beam body to a midspan cantilever section by section in a balanced manner, and applying prestress section by section. The main equipment is a pair of hanging baskets capable of walking, the hanging baskets move on beam sections which are already tensioned and anchored and are connected with the pier body into a whole, and the binding of reinforcing steel bars, the erection of a mould, the casting of concrete and the pre-stressing are all carried out on the hanging baskets. In the casting process, the error amount is often judged through experience of workers, and deviation from the ideal value of the design box in the construction process or in the bridge formation state can be caused. Therefore, a construction monitoring method for pouring a cantilever of a large-span bridge is provided to solve the difficulty existing in the prior art, and the method is a problem to be solved by a person skilled in the art. Disclosure of Invention The invention provides a construction monitoring method for large-span bridge cantilever pouring, which is characterized in that real-time data are compared with preset monitoring indexes through monitoring the whole construction process, particularly the cantilever pouring process, hidden dangers in construction are avoided in real time, and human errors are reduced through intelligent and automatic monitoring and control, so that the technical problems are solved. In order to achieve the above purpose, the present invention adopts the following technical scheme: A construction monitoring method for pouring a large-span bridge cantilever comprises the following steps: S1, collecting data information of the whole bridge construction process, performing three-dimensional modeling on a bridge structure by utilizing finite element software to obtain a finite element model of the bridge structure, performing simulation analysis on the finite element model of the bridge structure to obtain a simulation analysis result, and finally performing rechecking on the finite element model of the bridge structure; s2, building a construction monitoring system by utilizing finite element software, combining a finite element model of a bridge structure with actual monitoring data, monitoring each cantilever pouring stage in real time, and comparing the actual detection data with preset monitoring indexes; s3, analyzing the monitoring data in real time through finite element software, sending out early warning in time when the actual monitoring data exceeds the preset monitoring index range, and providing corresponding adjustment measures, and finally, sending out monitoring reports of the cantilever pouring process at each stage; And S4, after bridging, using finite element software to measure the bridging state and submitting a bridging monitoring report. In the above method, optionally, when the simulation analysis is performed in S1, the checking calculation is performed on the whole construction process, so as to check the data of the whole construction process. According to the method, optionally, after simulation analysis is performed in the step S1, the finite element model of the bridge structure is rechecked to evaluate the feasibility of the whole construction process. In the method, optionally, MIDAS CIVIL 2022 finite element software is used for three-dimensional modeling of the bridge structure in S1, and Ansys software is used for rechecking of the finite element model of the bridge structure. According to the method, optionally, the simulation analysis in the step S1 mainly comprises the steps of providing installation coordinates in the girder cantilever assembling process, calculating, analyzing and providing closure comments for the girder closure process. The method described above, optionally, the actual detected data in S2 includes, but is not limited to, girder alignment, pier misalignment, stress, and girder axis misalignment. Compared with the prior art, the invention provides a construction monitoring method for pouring a large-span bridge cantilever, which has the fo