A health monitoring construction method for a large-span steel corridor crossing above a subway

Abstract

The application provides a health monitoring construction method for a large-span steel corridor crossing over a subway, comprising deepening design, modeling deduction; ground compaction, laying of a roadbed plate; support of a jig, segmented hoisting; arrangement of DIC speckle points and strain gauges; series connection and collection of DIC monitoring, strain gauge and earth pressure cell monitoring data; comparison and deviation correction according to monitoring system cloud map data; and removal of monitoring equipment, the jig and the roadbed plate after completion of the steel corridor construction. The application can accurately monitor the construction load generated in each construction stage by embedding an earth pressure cell in the lower part of the roadbed plate to monitor and feed back the load value in real time, so that the over-limit is avoided. The strain gauges, the earth pressure cell and the DIC detection technology are connected in series to form a system, so that the global monitoring with full range and high precision is achieved, and a cloud map is generated, which is helpful for timely deviation correction, reduction of error accumulation and improvement of the installation precision of the large-span steel corridor.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to a health monitoring construction method for a large-span steel connecting corridor spanning a subway. Background Technology

[0002] With the advancement of urban construction, an increasing number of building projects are designed with a shared concept of integration and interconnection, connecting individual buildings through skybridges. These skybridges for inter-building communication typically utilize steel trusses, often with large spans, some even crossing roads or subway lines. The hoisting of these large-span steel truss skybridges presents significant construction challenges and requires stringent precision. Furthermore, road surface load limits are high for projects crossing roads or subway lines. Therefore, there is an urgent need to design a health monitoring and construction method applicable to large-span steel skybridges crossing subway lines. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a health monitoring construction method for large-span steel connecting corridors spanning subway lines, forming a comprehensive and precise monitoring system for the steel connecting corridor installation process, which helps to improve installation accuracy.

[0004] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0005] A construction method for health monitoring of a large-span steel connecting corridor spanning a subway line includes the following steps:

[0006] Step 1: Detailed design and modeling simulation;

[0007] Step 2: Compact the foundation and lay roadbed plates;

[0008] Step 3: Erect the support frame and hoist the steel connecting corridor truss, floor beams, roof beams and purlins in sections;

[0009] Step 4: Install DIC speckle patterns and strain gauges;

[0010] Step 5: Connect and summarize the monitoring data from the DIC monitoring equipment, strain gauges, and earth pressure cells to form a strain cloud map;

[0011] Step 6: Compare and correct the data based on the cloud map data;

[0012] Step 7: When the two sections of the steel connecting corridor are constructed to the middle, after eliminating accuracy errors and completing the closure, remove the monitoring equipment, formwork and roadbed plates.

[0013] Furthermore, the specific process of step 1 is as follows: according to the load limit requirements of the upper part of the subway structure, the entire span of the steel connecting corridor is divided into sections to ensure that the load transferred to the foundation through the jig during the hoisting of each section of the steel connecting corridor component meets the load limit requirements and leaves a certain degree of redundancy; after the detailed drawings are completed, a model is established and numerical simulation is performed to conduct a full-process simulation of the process connection under various working conditions, analyze the risk points of each process stage, and provide a basis for subsequent monitoring.

[0014] Furthermore, the specific process of step 2 is as follows: conduct geotechnical tests on the foundation, manually compact the foundation soil according to the test results, bury earth pressure cells on the foundation surface after compaction, and then lay roadbed plates according to the plan requirements.

[0015] Furthermore, the specific process of step 3 is as follows: after the roadbed plate is laid, its flatness is adjusted, and the frame lattice column is installed on the upper part according to the plan requirements. The top of the frame lattice column is equipped with jacks for adjustment in case of settlement or displacement. After the frame is installed, the steel corridor truss, floor beams, roof beams and purlins are installed in sections and segments in one go.

[0016] Furthermore, the specific process of step 4 is as follows: vibrating wire surface strain gauges are installed at the locations of high stress in the steel components, and speckle patterns for DIC monitoring are arranged on the surface of the lattice column and near the locations where strain gauges are installed on the steel components. The equipment is then installed at the corresponding locations according to the requirements of the DIC monitoring equipment.

[0017] Furthermore, the specific process of step 5 is as follows: the monitoring data of the DIC monitoring device, strain gauge, and earth pressure cell are connected and summarized in series: the real-time data collected by the earth pressure cell and strain gauge are summarized by the data acquisition device and connected in series with the DIC monitoring device. The data monitored by the earth pressure cell and strain gauge are automatically imported into the strain cloud map generated by the DIC monitoring device, and the monitoring data of the corresponding points in the strain cloud map are corrected according to the monitoring data of the strain gauge. When the monitoring data of key point settlement, deformation, etc. reach the alarm threshold, an early warning is issued.

[0018] Furthermore, the specific process of step 6 is as follows: based on the monitoring results of step 5, the cause of the large deformation is determined and analyzed, and the deviation is corrected by using the jack on the top of the jig or other measures.

[0019] The present invention has the following beneficial effects:

[0020] 1) The monitoring system formed by the present invention can include the main body of the steel corridor structure and temporary support components in the global monitoring scope, forming a health monitoring method with a more comprehensive monitoring scope and higher monitoring accuracy.

[0021] 2) The health monitoring system formed by the present invention can effectively control the construction load under the limited load condition and monitor the stress and strain of each component in real time according to the generated stress cloud map.

[0022] 3) This invention compares the monitoring data collected by the health monitoring system with the simulated situation, and makes timely adjustments and corrections during the steel structure installation process, thereby reducing the impact of cumulative errors on the large-span steel corridor and improving its installation accuracy. Attached Figure Description

[0023] Figure 1 This is a flowchart of the construction method described in this invention;

[0024] Figure 2 This is a schematic diagram of the steel connecting corridor described in this invention;

[0025] Figure 3 This is a schematic diagram of the segmented construction of the steel connecting corridor described in this invention. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0027] The health monitoring construction method for a large-span steel connecting corridor spanning a subway line as described in this invention is as follows: Figure 1 As shown, the process includes the following:

[0028] Step 1: Detailed design and modeling simulation;

[0029] According to the load limit requirements of the subway structure, the steel connecting corridor is divided into sections and segments to ensure that the load transferred to the foundation through the jig during the hoisting of each section of the steel connecting corridor component meets the load limit requirements and leaves a certain redundancy. After the detailed drawings are completed, a model is established and numerical simulation is carried out to simulate the entire process connection under various working conditions, analyze the risk points of each process stage, and provide a basis for later monitoring.

[0030] Step 2: Compact the foundation and lay roadbed plates;

[0031] Due to the load limit on the upper part of the subway structure, heavy machinery or vibratory machinery cannot be used to compact the foundation. In order to avoid large settlement, a geotechnical test is required for the foundation. Based on the test results, the foundation soil is manually compacted to improve its compaction. After compaction, soil pressure cells are buried on the foundation surface, and then the roadbed is laid according to the plan requirements.

[0032] Step 3: Erect the frame and hoist the equipment in sections;

[0033] After the roadbed slab is laid, its flatness is adjusted, and the lattice columns of the support frame are installed on top according to the plan requirements. Jacks are installed on the top of the lattice columns for easy adjustment in case of settlement or displacement. After the supports and support frame are installed, refer to... Figure 2 , 3 The steel connecting corridor truss, floor beams, roof beams and purlins are installed in sections and segments in one go.

[0034] Step 4: Install DIC speckle patterns and strain gauges;

[0035] Vibrating wire surface strain gauges are installed in areas of high stress in the steel components. Scattered spots for DIC monitoring are arranged on the surface of the lattice column and near the strain gauge locations on the steel components. Equipment is installed at appropriate locations according to the requirements of the DIC monitoring equipment.

[0036] Step 5: Connect and summarize the data from DIC monitoring, strain gauge, and earth pressure cell monitoring.

[0037] The monitoring data from the DIC monitoring equipment, strain gauges, and earth pressure cells are connected and summarized in series: the real-time data collected by the earth pressure cells and strain gauges are summarized by the data acquisition device and connected in series with the DIC monitoring equipment. The data monitored by the earth pressure cells and strain gauges are automatically imported into the strain cloud map generated by the DIC monitoring equipment, and the monitoring data of the corresponding points in the strain cloud map are corrected according to the monitoring data of the strain gauges. When the monitoring data of settlement, deformation, etc. at key points reach the alarm threshold, an early warning is issued.

[0038] Step 6: Compare and correct the data based on the cloud map data from the monitoring system;

[0039] Based on the monitoring results, the cause of the large deformation is determined and analyzed. Correction measures such as using jacks or other corrective measures are then taken to improve the installation accuracy of the steel structure.

[0040] Step 7: Complete the construction of the steel connecting corridor;

[0041] Once the two sections of the steel connecting corridor have been constructed to the middle and precision errors have been eliminated and the sections have been joined together, the monitoring equipment, formwork, and roadbed plates can be removed, and subsequent construction can continue.

[0042] This invention, based on the assembly of disassembled components, utilizes techniques such as reasonable division and numerical simulation to meet the load limits of subway construction, thereby achieving the purpose of subway protection. Furthermore, by embedding earth pressure cells under the roadbed slab to monitor and feedback load values ​​in real time, this invention can accurately monitor the construction loads generated at each construction stage, preventing overloading. By connecting strain gauges, earth pressure cells, and DIC detection technology in series to form a system, this invention achieves full-range, high-precision global monitoring. It can monitor not only the strain and displacement of each component of the steel connecting corridor but also the global monitoring of components such as the formwork and supports. The collected point cloud data generates cloud maps, which are compared with simulated conditions, facilitating timely correction, reducing cumulative errors, and improving the installation accuracy of large-span steel connecting corridors.

[0043] The embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A construction method for health monitoring of a large-span steel connecting corridor spanning a subway line, characterized in that, The process includes the following: Step 1: Detailed design and modeling simulation; Step 2: Compact the foundation and lay roadbed plates; Step 3: Erect the support frame and hoist the steel connecting corridor truss, floor beams, roof beams and purlins in sections; Step 4: Install DIC speckle patterns and strain gauges; Step 5: Connect and summarize the monitoring data from the DIC monitoring equipment, strain gauges, and earth pressure cells to form a strain cloud map; Step 6: Compare and correct the data based on the cloud map data; Step 7: When the two sections of the steel connecting corridor are constructed to the middle, after eliminating accuracy errors and completing the closure, remove the monitoring equipment, formwork and road plate. The specific process of step 1 is as follows: According to the load limit requirements of the upper part of the subway structure, the entire span of the steel connecting corridor is divided into sections to ensure that the load transferred to the foundation through the jig during the hoisting of each section of the steel connecting corridor component meets the load limit requirements and leaves a certain redundancy; after the detailed drawings are completed, a model is established and numerical simulation is carried out to simulate the entire process of the connection between the work processes under various working conditions, analyze the risk points of each work process stage, and provide a basis for later monitoring. The specific process of step 2 is as follows: conduct a geotechnical test on the foundation, manually compact the foundation soil according to the test results, and after compaction, bury an earth pressure cell on the foundation surface, and then lay the roadbed plate according to the plan requirements. The specific process of step 4 is as follows: Vibrating wire surface strain gauges are installed in the parts of the steel components with large stress, and speckle patterns for DIC monitoring are arranged on the surface of the lattice column of the formwork and near the locations where strain gauges are installed on the steel components. The equipment is installed at the corresponding locations according to the requirements of the DIC monitoring equipment. The specific process of step 5 is as follows: The monitoring data of DIC monitoring equipment, strain gauges and earth pressure cells are connected and summarized in series: The real-time data collected by earth pressure cells and strain gauges are summarized by the data acquisition device and connected in series with DIC monitoring equipment. The data monitored by earth pressure cells and strain gauges are automatically imported into the strain cloud map generated by DIC monitoring equipment. The monitoring data of corresponding points in the strain cloud map are corrected according to the monitoring data of strain gauges. When the settlement and deformation monitoring data of key points reach the alarm threshold, an early warning is issued.

2. The construction method for health monitoring of a large-span steel connecting corridor spanning a subway line according to claim 1, characterized in that, The specific process of step 3 is as follows: After the roadbed plate is laid, its flatness is adjusted, and the frame lattice column is installed on the upper part according to the plan requirements. The top of the frame lattice column is equipped with jacks for adjustment in case of settlement or displacement. After the frame is installed, the steel corridor truss, floor beams, roof beams and purlins are installed in sections and segments in one go.

3. The construction method for health monitoring of a large-span steel connecting corridor spanning a subway line according to claim 1, characterized in that, The specific process of step 6 is as follows: based on the monitoring results of step 5, the cause of the large deformation is determined and analyzed, and the deviation is corrected by using the jacks on the top of the jig.

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