Synchronous displacement monitoring method and system for long-span bridge construction

Abstract

The invention discloses a long-span bridge construction synchronous displacement monitoring method and system, and relates to the technical field of displacement monitoring. Comprising the following steps: data acquisition: arranging strain force detection modules on the surface of a bridge based on a first arrangement method to obtain strain data items of the bridge; arranging an acceleration detection module and an inclination angle detection module on the surface of the bridge based on a second arrangement method to obtain an acceleration data item and an inclination angle data item of the bridge; threshold value setting: respectively setting a strain threshold value, an acceleration threshold value and an inclination angle threshold value, and judging the construction state of the bridge based on a judgment method to obtain first feedback data; the stress detection module, the acceleration detection module and the inclination angle detection module are installed at different positions of the bridge respectively, the strain force, the acceleration and the inclination angle of the bridge are monitored in an all-around mode, data changes in the bridge construction process are comprehensively analyzed and monitored, and the safety of bridge construction is guaranteed to the maximum degree.

Description

Technical Field

[0001] The present invention relates to the technical field of displacement monitoring, and in particular to a method and system for synchronous displacement monitoring during construction of a large-span bridge. Background Art

[0002] A large-span bridge refers to a bridge with a large span, usually exceeding 100 meters. Due to its own technical characteristics and engineering difficulty, this type of bridge is widely used in highways, railways, urban transportation and other fields. During the construction process, the bridge will be subject to various loads, such as deadweight, construction load, wind load, etc. It is necessary to detect excessive deformation of the structure in time to prevent potential structural instability or damage. In addition, in the construction of large-span bridges, in order to avoid subsequent problems caused by construction deviations, it is necessary to monitor the displacement of the bridge during the entire construction process. Accurate displacement monitoring can ensure that the assembly or connection of each component meets the design requirements.

[0003] Patent publication number CN118031755A is a bridge construction displacement detection device. The two left and right positioning hook plates in the positioning component are moved equidistantly toward the middle until the clamping surfaces of the left and right positioning hook plates are clamped on the left and right sides of the bridge deck, thereby positioning the device as a whole. This ensures that the device is accurately located in the middle of the bridge deck without the need for manual measurement to position it, greatly improving the convenience of detection. On the other hand, since the left and right positioning hook plates are clamped on both sides of the bridge deck, they can also play a role in reinforcing the device as a whole, further improving the overall stability of the device.

[0004] In the process of displacement monitoring of the bridge using the above and similar technical solutions, since there are steps such as lifting, transportation, welding and installation in the entire construction process of the bridge, it is necessary to monitor the stress, acceleration and torsional force of the bridge in these steps to prevent safety hazards in the subsequent construction process. Therefore, it is necessary to monitor the status of the bridge from multiple aspects and dimensions at the same time. Summary of the invention

[0005] The object of the present invention is to provide a method and system for synchronous displacement monitoring during construction of a long-span bridge, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method and system for synchronous displacement monitoring during construction of a long-span bridge, comprising: Data acquisition: Based on the first arrangement method, a strain force detection module is arranged on the surface of the bridge to obtain strain data items of the bridge; based on the second arrangement method, an acceleration detection module and an inclination angle detection module are arranged on the surface of the bridge to obtain acceleration data items and inclination angle data items of the bridge; Threshold setting: setting the strain threshold, acceleration threshold and inclination angle threshold respectively, judging the construction status of the bridge based on the judgment method, and obtaining the first feedback data; Hoisting analysis: hoist the bridge based on the hoisting method, obtain the deformation data of the bridge, obtain the deformation item, and then obtain the second feedback data; Comprehensive feedback: Based on the first feedback data and the second feedback data, the stress condition of the bridge is comprehensively output to monitor the bridge construction; The determination method comprises: Step 1: strain force comparison, obtaining a first difference item based on the difference between the strain data item and the strain threshold; Step 2: acceleration comparison, obtaining a second difference item based on the difference between the acceleration data item and the acceleration threshold; Step 3: comparing the tilt angles, obtaining a third difference item based on the difference between the tilt angle data item and the tilt angle threshold; Step 4: Comprehensively judge and obtain the first feedback data based on the first difference item, the second difference item and the third difference item.

[0007] Furthermore, the first arrangement method includes: S1: establishing feature points: based on the overall length of the bridge, setting the first feature point and the second feature point at the two end positions of the bridge respectively, and obtaining the first feature point position item and the second feature point position item; S2: Module installation: installing stress detection modules based on the first feature point position item and the second feature point position item respectively.

[0008] Furthermore, the first arrangement method further includes: S3: Acquire the midpoint position, establish a connection line based on the first feature point position item and the second feature point position item, and obtain a connection line data item; S4: Additional installation, based on the connection data item, obtain the midpoint position of the connection data item to establish a third feature point, obtain the third feature point position item, and also install the stress detection module with the third feature point position item.

[0009] Furthermore, the second arrangement method includes: setting the installation position based on the third feature point position item, and installing the acceleration detection module and the inclination angle detection module respectively.

[0010] Furthermore, the method for setting the strain threshold, the acceleration threshold and the tilt angle threshold includes: N1: Material property acquisition, obtain the material properties of the bridge and obtain the material property items; N2: Standard reference, based on the material property items, the reference values ​​of the strain value, acceleration value and tilt angle value corresponding to the material are obtained respectively to obtain the reference value items; N3: historical data acquisition, based on the material property item, the historical construction data of the bridge corresponding to the material property item is acquired to obtain the historical data item; N4: Data combination, based on reference numerical items and historical data items, the strain threshold, acceleration threshold and tilt angle threshold are comprehensively obtained.

[0011] Furthermore, the hoisting method comprises: Z1: length acquisition, obtain the overall length of the bridge and obtain the length data item; Z1: Setting of lifting points: at least two lifting points are set on the top of the bridge based on the length data item. The lifting points divide the length data item into at least three parts, and at least three length division items are obtained; Z3: Proportion determination, setting the target proportion based on the length data item so that the lengthened sub-items meet the target proportion.

[0012] Furthermore, a synchronous displacement monitoring method for long-span bridge construction as described in any one of the above is used.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The method and system for synchronous displacement monitoring of large-span bridge construction respectively installs stress detection modules, acceleration detection modules and inclination angle detection modules at different positions of the bridge through a first arrangement method and a second arrangement method. During the lifting process of the bridge, the strain force, acceleration and inclination angle of the bridge are fully monitored, and the detection results are compared with the set safety threshold to obtain first feedback data. By limiting the lifting method of the bridge and obtaining the second feedback data of the stress condition of the bridge under the limited lifting method, the data changes during the bridge construction process are comprehensively analyzed and monitored to ensure the safety of the bridge construction to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the relationship between data acquisition and threshold setting, hoisting analysis and comprehensive feedback of the present invention; Figure 2 It is a schematic diagram of the judgment method of the present invention; Figure 3 This is a schematic diagram of the strain change at the first characteristic point of Example 1 of the present invention; Figure 4 This is a schematic diagram of the strain change at the second characteristic point of Example 1 of the present invention; Figure 5 This is a schematic diagram of the strain change at the third characteristic point of Example 1 of the present invention; Figure 6 This is a schematic diagram of acceleration change in Example 1 of the present invention; Figure 7This is a schematic diagram of the tilt angle change of embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the strain change at the first characteristic point of Example 2 of the present invention; Fig. 9 This is a schematic diagram of the strain change at the second characteristic point of Example 2 of the present invention; Fig.10 This is a schematic diagram of the strain change at the third characteristic point of Example 2 of the present invention; Fig.11 This is a schematic diagram of acceleration change in Example 2 of the present invention; Fig.12 This is a schematic diagram of the tilt angle change of embodiment 2 of the present invention; Fig.13 This is a schematic diagram of the strain change at the first characteristic point of Example 3 of the present invention; Fig.14 This is a schematic diagram of the strain change at the second characteristic point of Example 3 of the present invention; Fig.15 This is a schematic diagram of the strain change at the third characteristic point of Example 3 of the present invention; Fig.16 This is a schematic diagram of acceleration change in Example 3 of the present invention; Fig.17 This is a schematic diagram of the tilt angle change of embodiment 3 of the present invention; Fig.18 It is a schematic diagram of the hoisting position of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] During the construction of the bridge, it is necessary to lift the bridge in sections and install it when it is lifted to the appropriate position. During this process, the stress of each part of the bridge will change differently, and the acceleration of the bridge will also change differently during the lifting process. Different accelerations have different impacts on the impact of the entire bridge. In the process of lifting and docking the bridge, the bridge will torsion to varying degrees. When the torsion angle is small, it will not affect the overall construction of the bridge. When the torsion angle of the bridge exceeds a certain range, there will be more serious safety hazards. Therefore, it is necessary to control the stress of different positions of the bridge during the entire construction process. The force and acceleration are monitored. The technical solution provided by the present application, through the first arrangement method and the second arrangement method, respectively installs stress detection modules, acceleration detection modules and inclination angle detection modules at different positions of the bridge. During the lifting process of the bridge, the strain force, acceleration and inclination angle of the bridge are monitored in an all-round way, and the detection results are compared with the set safety threshold to obtain the first feedback data. By limiting the lifting method of the bridge and obtaining the second feedback data of the stress condition of the bridge under the limited lifting method, the data changes in the process of bridge construction are comprehensively analyzed and monitored to ensure the safety of bridge construction to the greatest extent.

[0017] like Figure 1-Figure 2 As shown, the present invention provides a technical solution: a method and system for synchronous displacement monitoring of large-span bridge construction, comprising: data acquisition: arranging a strain force detection module on the surface of the bridge based on a first arrangement method to obtain strain data items of the bridge; arranging an acceleration detection module and an inclination angle detection module on the surface of the bridge based on a second arrangement method to obtain acceleration data items and inclination angle data items of the bridge; threshold setting: setting a strain threshold, an acceleration threshold and an inclination angle threshold respectively, judging the construction status of the bridge based on a judgment method, and obtaining first feedback data; hoisting analysis: hoisting the bridge based on the hoisting method, and obtaining the deformation data of the bridge. According to the first feedback data and the second feedback data, the deformation item is obtained, and then the second feedback data is obtained; comprehensive feedback: based on the first feedback data and the second feedback data, the stress condition of the bridge is comprehensively output, and then the bridge construction is monitored; the judgment method includes: step one: strain force comparison, based on the difference between the strain data item and the strain threshold, the first difference item is obtained; step two: acceleration comparison, based on the difference between the acceleration data item and the acceleration threshold, the second difference item is obtained; step three: inclination angle comparison, based on the difference between the inclination angle data item and the inclination angle threshold, the third difference item is obtained; step four: comprehensive judgment, based on the first difference item, the second difference item and the third difference item, the first feedback data is obtained.

[0018] The first arrangement method includes: S1: feature point establishment, based on the overall length of the bridge, the first feature point and the second feature point are respectively set at the two end positions of the bridge to obtain the first feature point position item and the second feature point position item; S2: module installation, based on the first feature point position item and the second feature point position item, the stress detection module is respectively installed.

[0019] The first arrangement method also includes: S3: midpoint position acquisition, establishing a connection based on the first feature point position item and the second feature point position item to obtain a connection data item; S4: additional installation, based on the connection data item, acquiring the midpoint position of the connection data item to establish a third feature point, obtaining a third feature point position item, and installing the stress detection module with the third feature point position item in the same manner.

[0020] It should be noted that the first characteristic point and the second characteristic point are the tops of the two ends of the bridge, and the third characteristic point is the middle position of the belly of the bridge. The stress detection module is a strain gauge, so the first characteristic point, the second characteristic point and the third characteristic point are respectively arranged with strain gauges.

[0021] The second arrangement method includes: setting the installation position based on the third feature point position item, and installing the acceleration detection module and the inclination angle detection module respectively.

[0022] It should be noted that the acceleration detection module and the inclination angle detection module are respectively an acceleration vibration sensor and an inclinometer, both of which are installed in the middle of the top of the bridge.

[0023] The setting method of strain threshold, acceleration threshold and inclination angle threshold includes: N1: material property acquisition, acquiring the material properties of the bridge to obtain material property items; N2: specification reference, based on the material property items, respectively obtaining reference values ​​of strain value, acceleration value and inclination angle value corresponding to the material to obtain reference value items; N3: historical data acquisition, based on the material property items, obtaining the historical construction data of the bridge corresponding to the material property items to obtain historical data items; N4: data combination, based on the reference value items and the historical data items, comprehensively obtaining the strain threshold, acceleration threshold and inclination angle threshold.

[0024] The hoisting method includes: Z1: length acquisition, obtaining the overall length of the bridge and obtaining the length data item; Z2: hoisting point setting, based on the length data item, at least two hoisting points are set on the top of the bridge, and the hoisting points divide the length data item into at least three parts, and obtain at least three length division items; Z3: proportion determination, setting the target proportion based on the length data item so that the length division item meets the target proportion.

[0025] It should be noted that four lifting points are set on the top of the bridge, in groups of two, to divide the top of the bridge into three parts, and the target ratio of the three parts is 1:3:1.

[0026] A synchronous displacement monitoring system for long-span bridge construction uses any one of the above-mentioned synchronous displacement monitoring methods for long-span bridge construction.

[0027] In the specific implementation process, the prefabricated hoisting segment 27.197m is selected as Example 1, the prefabricated hoisting segment 27.446m is selected as Example 2, and the prefabricated hoisting segment 24.460m is selected as Example 3. These three prefabricated hoisting segments are selected as monitoring objects. Various sensor devices are deployed to monitor the deformation and vibration of the segments during the whole hoisting process, so as to evaluate the stress conditions of the steel box girder during the hoisting process, including whether the stress distribution is uniform, whether it exceeds the design limit, etc. At the same time, by monitoring and analyzing the acceleration data, the stability and safety of the hoisting process can be evaluated, possible hoisting problems can be discovered in time, and corresponding measures can be taken to adjust and control them to ensure the safety and stability of the hoisting process.

[0028] In the specific implementation process, Figure 3-Figure 5 It can be seen that the strain values ​​at the top surface and web of the beam fluctuate to a certain extent, with the maximum value ranging from 43.67µε to 98.36µε, which is much smaller than the yield strain value of the material. This indicates that the stress state of the beam has been kept in an elastic state during construction, and the hoisting construction process has no significant effect on its stress performance. Figure 6 It can be seen that the maximum acceleration of the beam is 0.387m / s2, which is less than 2m / s2. Figure 7 From the monitoring results of beam rotation, it can be seen that the maximum rotation angle of the beam is 1.88°. Based on the above monitoring results, it can be seen that the lifting process of the beam during construction is smooth and safe, the center of gravity of the beam is stable, the lifting equipment is reliable, and the lifting plan is reasonable.

[0029] In the specific implementation process, Figure 8-Figure 10 It can be seen that although the strain values ​​at the top surface and web of the beam fluctuate slightly, the maximum value varies from 39.25µε to 114.39µε, which is much smaller than the yield strain value of the material itself. This indicates that the stress state of the beam has been kept in an elastic state during construction, and the hoisting construction process has no significant effect on its stress performance. Fig.11 It can be seen that the maximum acceleration of the beam is 0.519m / s2, which is less than 2m / s2. Fig.12 From the monitoring results of beam rotation, it can be seen that the maximum rotation angle of the beam is 4.08°. Based on the above monitoring results, it can be seen that the lifting process of the beam during construction is smooth and safe, the center of gravity of the beam is stable, the lifting equipment is reliable, and the lifting plan is reasonable.

[0030] In the specific implementation process, Figure 13-Figure 15It can be seen that the strain values ​​at the top surface and web of the beam vary from 57.62µε to 72.41µε, which is much smaller than the yield strain value of the material itself. This indicates that the stress state of the beam body has been kept in an elastic state during construction, and the hoisting construction process has no significant effect on its stress performance. Fig.16 It can be seen that the maximum acceleration of the beam is 0.316m / s2, which is less than 2m / s2. Fig.17 The monitoring results of beam rotation show that the maximum rotation angle of the beam is 5.34°. Based on the above monitoring results, it can be seen that the lifting process of the beam during construction is stable and safe, the center of gravity of the beam is stable, the lifting equipment is reliable, and the lifting plan is reasonable. From the above analysis, it can be seen that the three selected beams of Example 1, Example 2 and Example 3 are in a stable state during the entire lifting construction monitoring process, and the stress of the beam itself has no significant change, indicating that the construction plan is reasonable and feasible.

[0031] In the specific implementation process, in order to further understand the stress state of the beam body during the hoisting process, the beam body in Example 1 is selected to simulate and analyze its deformation during the hoisting and welding construction process. The established model is as follows: Fig.18 As shown, the deformation of the beam is obtained. After the beam is lifted at a certain speed, its maximum deformation is about 0.1 mm, and it is concentrated in the mid-span of the beam. The deformation of other parts is smaller. Overall, the beam itself has basically no obvious deformation, indicating that this lifting construction method will not have any adverse effect on the beam.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A method for synchronous displacement monitoring of long-span bridge construction, characterized in that: include: Data acquisition: arranging a strain force detection module on the bridge surface based on the first arrangement method to obtain strain data items of the bridge; Arranging an acceleration detection module and an inclination angle detection module on the bridge surface based on the second arrangement method to obtain acceleration data items and inclination angle data items of the bridge; Threshold setting: setting the strain threshold, acceleration threshold and inclination angle threshold respectively, judging the construction status of the bridge based on the judgment method, and obtaining the first feedback data; Hoisting analysis: hoist the bridge based on the hoisting method, obtain the deformation data of the bridge, obtain the deformation item, and then obtain the second feedback data; Comprehensive feedback: Based on the first feedback data and the second feedback data, the stress condition of the bridge is comprehensively output to monitor the bridge construction; The determination method comprises: Step 1: strain force comparison, obtaining a first difference item based on the difference between the strain data item and the strain threshold; Step 2: acceleration comparison, obtaining a second difference item based on the difference between the acceleration data item and the acceleration threshold; Step 3: comparing the tilt angles, obtaining a third difference item based on the difference between the tilt angle data item and the tilt angle threshold; Step 4: Comprehensively judge and obtain the first feedback data based on the first difference item, the second difference item and the third difference item.

2. The method for synchronous displacement monitoring of a long-span bridge construction according to claim 1, characterized in that: The first arrangement method comprises: S1: establishing feature points: based on the overall length of the bridge, setting the first feature point and the second feature point at the two end positions of the bridge respectively, and obtaining the first feature point position item and the second feature point position item; S2: Module installation: installing stress detection modules based on the first feature point position item and the second feature point position item respectively.

3. The method for synchronous displacement monitoring of a long-span bridge construction according to claim 2 is characterized in that: The first arrangement method further comprises: S3: Acquire the midpoint position, establish a connection line based on the first feature point position item and the second feature point position item, and obtain a connection line data item; S4: Additional installation, based on the connection data item, obtain the midpoint position of the connection data item to establish a third feature point, obtain the third feature point position item, and also install the stress detection module with the third feature point position item.

4. The method for synchronous displacement monitoring of a long-span bridge construction according to claim 1 is characterized in that: The second arrangement method includes: setting the installation position based on the third feature point position item, and installing the acceleration detection module and the inclination angle detection module respectively.

5. The method for synchronous displacement monitoring of a long-span bridge construction according to claim 1 is characterized in that: The method for setting the strain threshold, acceleration threshold and tilt angle threshold includes: N1: Material property acquisition, obtain the material properties of the bridge and obtain the material property items; N2: Standard reference, based on the material property items, the reference values ​​of the strain value, acceleration value and tilt angle value corresponding to the material are obtained respectively to obtain the reference value items; N3: historical data acquisition, based on the material property item, the historical construction data of the bridge corresponding to the material property item is acquired to obtain the historical data item; N4: Data combination, based on reference numerical items and historical data items, the strain threshold, acceleration threshold and tilt angle threshold are comprehensively obtained.

6. The method for synchronous displacement monitoring of a long-span bridge construction according to claim 1 is characterized in that: The hoisting method comprises: Z1: length acquisition, obtain the overall length of the bridge and obtain the length data item; Z1: Setting of lifting points: at least two lifting points are set on the top of the bridge based on the length data item. The lifting points divide the length data item into at least three parts, and at least three length division items are obtained; Z3: Proportion determination, setting the target proportion based on the length data item so that the lengthened sub-items meet the target proportion.

7. A synchronous displacement monitoring system for long-span bridge construction, characterized in that: A method for synchronous displacement monitoring of long-span bridge construction as described in any one of claims 1 to 6 is used.

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