Steel plate combined continuous beam construction deformation monitoring and early warning system

Abstract

The present application relates to a kind of steel plate combination continuous beam construction deformation monitoring early warning system, including distance monitoring device, external load monitoring device and control equipment.Distance monitoring device includes mounting plate, first distance measuring device, second distance measuring device and reflector.Control equipment monitors the first change trend of external load, and the time when the external load is equal to the first preset load threshold in the first change trend is picked up as reference time by control equipment, and the length of time from current time to reference time is calculated.Control equipment detects the first distance data and the second distance data corresponding to current time when the length of time is equal to the first preset length of time, if horizontal deformation is greater than preset horizontal deformation, vertical deformation is greater than preset vertical deformation, and / or lateral corner deformation is greater than preset corner deformation, then control equipment issues first type of alarm.Sufficiently monitor the use state of I-beam, repair in time when deformation is found, improve the use safety performance of I-beam.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, and in particular to a deformation monitoring and early warning system for steel plate composite continuous beam construction. Background Technology

[0002] With the development of highway steel structure bridge technology, a large number of steel structure bridges have emerged in China. However, steel plate composite beam bridges have some adverse factors at various stages of construction, which can affect construction quality and endanger structural safety. For example, during the steel beam erection stage, the steel beams have poor stability and are prone to overturning. Under the action of wind loads, temperature loads, and other temporary construction loads (such as collisions with moving concrete leveling machinery or construction machinery), the steel beams may become unstable or overturn due to excessive displacement or rotation, which may even cause serious engineering accidents. Therefore, it is necessary to effectively monitor the deformation of steel beams during the construction stage of steel plate composite beam bridges. Although there are technologies that can monitor steel structure deformation, existing technologies cannot monitor the deformation of steel structures under load. Summary of the Invention

[0003] Based on this, it is necessary to provide a deformation monitoring and early warning system for steel plate composite continuous beam construction, which addresses the problem that traditional monitoring technologies cannot detect the deformation of steel beams in a timely manner. The system includes a distance monitoring device, an external load monitoring device, and control equipment. The external load monitoring device is installed on the I-beam and is used to monitor the external loads borne by the I-beam caused by external factors.

[0004] The distance monitoring device includes a mounting plate, a first ranging device, a second ranging device, and a reflector.

[0005] The mounting plate includes a mounting part and an extension part. The mounting plate is mounted on the upper flange of the I-beam via the mounting part, and the extension part extends outward from the I-beam. A first ranging device and a second ranging device are mounted on the extension part. A reflector is disposed relative to the mounting plate and is used to reflect the ranging signals emitted by the first ranging device and the second ranging device.

[0006] The signal transmission direction of the first ranging device remains the same as the direction of gravity as the I-beam deforms, while the signal transmission direction of the second ranging device remains perpendicular to the surface of the mounting plate as the I-beam deforms. When the I-beam is not deformed, the line connecting the signal transmission ports of the first and second ranging devices is parallel to the outer edge of the upper flange of the I-beam. The control equipment is communicatively connected to the first ranging device, the second ranging device, and the external load monitoring device.

[0007] The control device receives first distance data relative to the reflector measured by the first ranging device, receives second distance data relative to the reflector measured by the second ranging device, and receives external load monitored by the external load monitoring device.

[0008] The control device monitors the first trend of change of the applied load, and the control device picks up the moment when the applied load is equal to the first preset load threshold in the first trend of change as the reference moment, and calculates the duration from the current moment to the reference moment; the first trend of change is the change of the applied load from being greater than the first preset load threshold to being less than the second preset load threshold; the first preset load threshold is greater than the second preset load threshold.

[0009] When the control device detects the first distance data and the second distance data corresponding to the current moment when the duration is equal to the first preset duration, if the horizontal deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset horizontal deformation, the vertical deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset vertical deformation, and / or the lateral angle deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset angle deformation, then the control device issues a first type of alarm; the first type of alarm indicates that the I-beam has undergone permanent deformation under external load.

[0010] In one embodiment, the control device monitors a second trend of change of the applied load. When the applied load in the second trend is equal to a first preset load threshold, the control device detects the first distance data and the second distance data corresponding to the current time. If the horizontal deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than a preset horizontal deformation, the vertical deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than a preset vertical deformation, and / or the lateral angle deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than a preset angle deformation, then the control device issues a second type of alarm.

[0011] The second trend is that the applied load changes from less than the second preset load threshold to greater than the second preset load threshold but less than the first preset load threshold; the second type of alarm indicates that the I-beam deforms under the applied load.

[0012] In one embodiment, after the second change trend, the applied load changes from being greater than a second preset load threshold to being less than a second preset load threshold; if the horizontal deformation calculated based on the first distance data and the second distance data corresponding to the current time is less than or equal to a preset horizontal deformation, the vertical deformation calculated based on the first distance data and the second distance data corresponding to the current time is less than or equal to a preset vertical deformation, and the lateral angle deformation calculated based on the first distance data and the second distance data corresponding to the current time is less than or equal to a preset angle deformation, then the second type of alarm is canceled.

[0013] In one embodiment, the control device monitors the third trend of the applied load, detects the first distance data and the second distance data corresponding to the current moment, and if the horizontal deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset horizontal deformation, the vertical deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset vertical deformation, and / or, the lateral angle deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset angle deformation, then the control device issues a third type of alarm;

[0014] Among them, the third trend is that the applied load is less than the second preset load threshold; the third type of alarm indicates that the I-beam deforms without being subjected to an applied load.

[0015] In one embodiment, the length of the I-beam exceeds a preset length; at least two distance monitoring devices and an external load monitoring device are installed on the I-beam;

[0016] When the applied load is less than or equal to the second preset load, the control equipment controls each distance monitoring device to collect distance data periodically and controls each distance monitoring device to start in staggered shifts; it also controls each external load monitoring device to collect applied load data periodically and controls each external load monitoring device to start in staggered shifts.

[0017] When the applied load exceeds the second preset load, the control equipment controls each distance monitoring device to collect distance data in real time; and controls each external load monitoring device to collect the applied load in real time.

[0018] In one embodiment, the external load monitoring device is one or any combination of a pressure detector, a torque detector, and a wind speed detector.

[0019] In one embodiment, the length of the reflector is equal to twice the horizontal deformation safety threshold of the I-beam;

[0020] When the I-beam is not deformed, the signals emitted by the first and second ranging devices hit the center line of the reflector.

[0021] In one embodiment, an alarm device is also included;

[0022] The control device communicates with the alarm device, and the control device controls the alarm device to trigger an alarm.

[0023] In one embodiment, the alarm device is a light alarm, a sound alarm, or a sound and light alarm.

[0024] In one embodiment, the first ranging device is a rotating distance measuring device, so that the signal transmission direction of the first ranging device is always the same as the direction of gravity as the I-beam deforms.

[0025] The second ranging device is a fixed distance measuring device, so that the signal transmission direction of the second ranging device is always perpendicular to the surface of the mounting plate as the I-beam deforms.

[0026] In one embodiment, the first ranging device is a laser rangefinder; the second ranging device is a laser rangefinder.

[0027] The control equipment is communicatively connected to the first ranging device and the second ranging device.

[0028] One of the above technical solutions has the following advantages and beneficial effects:

[0029] The steel plate composite continuous beam construction deformation monitoring and early warning system provided in the embodiments of this application includes a distance monitoring device, an external load monitoring device, and a control device. The distance monitoring device includes a mounting plate, a first distance measuring device, a second distance measuring device, and a reflector. The control device is communicatively connected to the first distance measuring device, the second distance measuring device, and the external load monitoring device, respectively, so that the control device receives first distance data to the reflector measured by the first distance measuring device, receives second distance data to the reflector measured by the second distance measuring device, and receives the external load monitored by the external load monitoring device. The control device monitors a first trend of change in the external load, and selects the moment when the external load equals a first preset load threshold within the first trend as a reference moment, and calculates the duration from the current moment to the reference moment. When the control device detects the first and second distance data corresponding to the current moment during a time period equal to a first preset time period, if the horizontal deformation calculated based on the first and second distance data corresponding to the current moment is greater than a preset horizontal deformation, the vertical deformation calculated based on the first and second distance data corresponding to the current moment is greater than a preset vertical deformation, and / or the lateral angle deformation calculated based on the first and second distance data corresponding to the current moment is greater than a preset angle deformation, then the control device issues a first-type alarm; the first-type alarm indicates that the I-beam has undergone permanent deformation under external load. This application determines the deformation of the I-beam caused by the external load by monitoring the external load borne by the I-beam and combining the acquired first and second distance data. Furthermore, even when the external load is zero, the deformation of the I-beam can still be determined using the first and second distance data. This allows for comprehensive monitoring of the I-beam's usage status, enabling timely repair upon detection of deformation and improving the safety performance of the I-beam. Attached Figure Description

[0030] The above and other objects, features, and advantages of this application will become clearer through a more detailed description of the preferred embodiments illustrated in the accompanying drawings. The same reference numerals denote the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the main points of this application.

[0031] Figure 1 This is a cross-sectional schematic diagram of the steel plate composite continuous beam construction deformation monitoring and early warning system in the embodiments of this application.

[0032] Figure 2 This is a bottom view of the steel plate composite continuous beam construction deformation monitoring and early warning system in this embodiment of the application, with respect to the mounting plate.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10. Distance monitoring device; 11. Mounting plate; 13. First distance measuring device; 15. Second distance measuring device; 17. Reflector; 20. External load monitoring device; 30. Control equipment; 40. I-beam. Detailed Implementation

[0035] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate preferred embodiments of the application. However, this application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0036] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "set up," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] Steel plate composite girder bridges may deform under external loads during construction (which can be done using hoisting methods) and during use. This deformation accumulates and exceeds safe limits, potentially leading to instability or overturning due to excessive displacement or rotation, and even causing serious engineering accidents. Therefore, to effectively monitor the deformation of steel plate composite girder bridges and avoid the problems of missed detections or untimely monitoring in traditional manual monitoring techniques, this application provides a construction deformation monitoring system for I-beams (40mm diameter). Figure 1 As shown, it includes a distance monitoring device 10, an external load monitoring device 20, and a control device 30.

[0039] The external load monitoring device 20 is installed on the I-beam 40 to monitor the external loads borne by the I-beam 40 due to external factors. These external factors can include impact, wind, and gravity. For example, an impact load is an instantaneous impact force, which may cause the I-beam 40 to deform by translation, bending, or torsion. A wind load is a sustained stress, which may also cause the I-beam 40 to deform by translation, bending, or torsion. A gravity load is a downward compressive stress on the I-beam 40, which may cause the I-beam 40 to deform by sinking, bending, or torsion. Accordingly, in one example, the external load monitoring device 20 is one or any combination of a pressure detector, a torque detector, and a wind speed detector. Specifically, the choice can be made according to the actual application scenario. For example, a pressure detector, a torque detector, or a wind speed detector can be used alone, or a combination of a pressure detector and a torque detector, a pressure detector and a wind speed detector, a torque detector and a wind speed detector, or a combination of a pressure detector, a torque detector, and a wind speed detector.

[0040] The distance monitoring device 10 is used to measure the distance between the distance monitoring device 10 and a specific location. In one example, the distance monitoring device 10 includes a mounting plate 11, a first distance measuring device 13, a second distance measuring device 15, and a reflector 17.

[0041] The mounting plate 11 includes a mounting portion and an extension portion. The mounting plate 11 is mounted to the upper flange of the I-beam 40 via the mounting portion, and the extension portion extends outward from the I-beam 40. The I-beam 40 is a structural component of a steel plate composite beam bridge. For example, the mounting portion of the mounting plate 11 can be welded to the upper flange of the I-beam 40, or the mounting portion of the mounting plate 11 can be fixed to the upper flange of the I-beam 40 using rivets. The mounting plate 11 can be installed on the ground before the I-beam 40 is hoisted. The extension portion of the mounting plate 11 extends outward from the I-beam 40, providing installation space for the first ranging device 13 and the second ranging device 15, thus preventing the signals emitted by the first ranging device 13 and the second ranging device 15 from directly hitting the I-beam 40 and thus preventing deformation monitoring. The shape, material, and size of the mounting plate 11 can be determined according to actual needs. For example, the mounting plate 11 can be a rectangular steel plate, the thickness of the mounting plate 11 is the same as the upper flange plate of the I-beam 40, and the width of the mounting plate 11 can be 30cm, 40cm, 60cm, etc. Among them, the width of the mounting part connecting the mounting plate 11 to the upper flange plate of the I-beam 40 is 8cm, 9cm, 11cm, etc.

[0042] The first ranging device 13 is used to monitor the vertical distance between itself and the reflector 17. The first ranging device 13 is disposed on the extension of the mounting plate 11. As shown in the figure, in one example, the first ranging device 13 includes a first mounting base and a first measuring body. The first mounting base is installed on the other end of the mounting plate 11 by welding, riveting, or other methods. The first measuring body is installed on the first mounting base. Specifically, the first measuring body and the first mounting base are movably connected. For example, the first measuring body and the first mounting base are connected by a ball chain, so that the signal transmission direction of the first ranging device 13 is always the same as the direction of gravity as the I-beam 40 deforms. That is, the first ranging device 13 is a rotating distance measuring device. Since the measurement direction (i.e., the signal transmission direction) of the first ranging device 13 is always the same as the direction of gravity, the first ranging device 13 transmits signals to the reflector 17 at different time points, and can measure the first distance data of itself relative to the reflector 17 at different time points, and transmit the monitored first distance data to the control device 30. It should be noted that the first distance data includes the vertical distance from the signal transmitting port of the first ranging device 13 to the reflector 17, and also includes the horizontal movement distance of the signal transmitting port of the first ranging device 13 relative to the reflector 17. The first ranging device 13 can be selected according to actual needs; for example, the first ranging device 13 can be a laser rangefinder or an ultrasonic rangefinder.

[0043] The second ranging device 15 is used in conjunction with the first ranging device 13 to monitor the lateral deformation of the I-beam 40. The second ranging device 15 is located at the other end of the mounting plate 11. In one example, as shown in the figure, the second ranging device 15 includes a second mounting base and a second measuring body. The second mounting base is installed on the other end of the mounting plate 11 by welding, riveting, or other methods. The second measuring body is installed on the second mounting base. Specifically, the second measuring body is fixedly connected to the second mounting base, for example, by screws, nuts, or bolts, so that the signal transmission direction of the second ranging device 15 remains perpendicular to the surface of the mounting plate 11 as the I-beam 40 deforms. That is, the second ranging device 15 is a fixed distance measuring device. The second ranging device 15 measures its second distance data relative to the reflector 17. It should be noted that the second distance data is the distance from the signal transmission port of the second ranging device 15, along the signal transmission direction of the second ranging device 15, to the reflector 17. The second ranging device 15 can be selected according to actual needs. For example, the second ranging device 15 can be a laser rangefinder or an ultrasonic rangefinder.

[0044] The control device 30 is used to process data, issue alarms, and control the operation of the distance monitoring device 10 and the external load monitoring device 20. For this purpose, the control device 30 is communicatively connected to the first ranging device 13, the second ranging device 15, and the external load monitoring device 20, respectively. Through these communication connections, the control device 30 receives first distance data relative to the reflector 17 measured by the first ranging device 13, receives second distance data relative to the reflector 17 measured by the second ranging device 15, and receives the external load monitored by the external load monitoring device 20.

[0045] Based on different changes in the applied load, the control device 30 has at least the following three alarm methods:

[0046] The first method involves the control device 30 monitoring the first trend of change in the applied load. The control device 30 selects the moment when the applied load equals a first preset load threshold within this first trend as a reference moment and calculates the duration from the current moment to the reference moment. The first preset load threshold is greater than a second preset load threshold. In one example, the first preset load threshold refers to the maximum applied load that the I-beam 40 can withstand without deformation (i.e., without impact, proportional swaying, or shaking), or 70% to 80% of that maximum applied load. The second preset load refers to the minimum applied load that can act on the I-beam 40. It should be noted that the trend of change in the applied load refers to the change in the applied load over time. The first trend is when the applied load changes from greater than the first preset load threshold to less than the second preset load threshold, indicating that the I-beam 40 is gradually decreasing from being subjected to an applied load exceeding its maximum bearing capacity. In this case, the I-beam 40 is subjected to an applied load exceeding its bearing limit, which may lead to structural damage, i.e., irreversible permanent deformation.

[0047] When the duration equals a first preset duration, the control device 30 detects the first and second distance data corresponding to the current moment. If the horizontal deformation calculated based on the first and second distance data corresponding to the current moment is greater than the preset horizontal deformation, the vertical deformation calculated based on the first and second distance data corresponding to the current moment is greater than the preset vertical deformation, and / or the lateral angle deformation calculated based on the first and second distance data corresponding to the current moment is greater than the preset angle deformation, then the control device 30 issues a first type of alarm. The first preset duration is the recovery time reserved for the I-beam 40 after being subjected to a strong load. The first preset duration can be set according to actual needs, for example, 30 seconds, 40 seconds, 1 minute, etc. The preset horizontal deformation is the maximum horizontal deformation that the I-beam 40 can accept (the horizontal direction refers to the direction parallel to the ground plane), or 70% to 90% of that maximum horizontal deformation. The preset vertical deformation is the maximum acceptable horizontal deformation of the I-beam 40 (vertical direction refers to the direction parallel to the direction of gravity), or 80% to 95% of that maximum horizontal deformation. The preset angular deformation is the maximum acceptable torsional deformation of the I-beam 40, or 75% to 95% of that maximum torsional deformation. A Class 1 alarm indicates that the I-beam 40 has undergone permanent deformation under external load. A Class 1 alarm also indicates that the I-beam 40 has suffered catastrophic damage after being subjected to an external load exceeding its bearing limit and is no longer usable.

[0048] In this method, a first-class alarm will be issued as long as any one of the horizontal deformation, vertical deformation, or angular deformation exceeds the preset deformation amount.

[0049] In one example, the angular deformation is obtained based on the following method:

[0050] When the I-beam 40 does not undergo lateral rotation deformation, the signal emitted by the second ranging device 15 is perpendicular to the reflector 17. When the I-beam 40 undergoes lateral rotation deformation, the signal emitted by the second ranging device 15 forms a certain angle with the reflector 17. The second ranging device 15 emits signals to the reflector 17 at different time points, measuring the distance data between itself and the reflector 17 at different time points, and transmits the monitored distance data to the control device 30. Based on this distance data and the vertical distance data measured by the first ranging device 13, the control device 30 can calculate the lateral rotation deformation of the I-beam 40 using the following formula:

[0051]

[0052] The second method involves the control device 30 monitoring a second trend in the applied load. When the applied load in this second trend equals a first preset load threshold, the control device 30 detects the first and second distance data corresponding to the current moment. If the horizontal deformation calculated based on the first and second distance data at the current moment is greater than a preset horizontal deformation, the vertical deformation calculated based on the first and second distance data at the current moment is greater than a preset vertical deformation, and / or the lateral angle deformation calculated based on the first and second distance data at the current moment is greater than a preset angle deformation, then the control device 30 issues a second type of alarm. It should be noted that the second trend is when the applied load changes from less than the second preset load threshold to greater than the second preset load threshold but less than the first preset load threshold. This indicates that the applied load on the I-beam 40 is increasing, but within the range that the I-beam 40 can withstand. In this case, if any one of the horizontal deformation, vertical deformation, or angle deformation exceeds a preset deformation, a second type of alarm is issued. The second type of alarm indicates that the I-beam 40 is deformed under the applied load. The second type of alarm indicates that the I-beam 40 has deformed without being subjected to an external load exceeding its bearing limit. This deformation may be a temporary deformation of the I-beam 40 after being subjected to an external load, or it may be a structural, irreversible, permanent deformation. It may also be that the design or installation of the I-beam 40 has resulted in its load-bearing capacity not reaching the first preset load threshold.

[0053] Furthermore, if, after the second trend, the applied load changes from being greater than the second preset load threshold to being less than the second preset load threshold; if the horizontal deformation calculated based on the first and second distance data corresponding to the current moment is less than or equal to the preset horizontal deformation, the vertical deformation calculated based on the first and second distance data corresponding to the current moment is less than or equal to the preset vertical deformation, and the lateral angle deformation calculated based on the first and second distance data corresponding to the current moment is less than or equal to the preset angle deformation, then the second type of alarm is cancelled. In other words, if, after experiencing the second trend, the applied load returns to being less than the second preset load threshold, and the horizontal deformation, vertical deformation, and angle deformation of the I-beam 40 are all less than or equal to the preset deformation, it indicates that the I-beam 40 has only experienced temporary deformation under the applied load and has not caused structural damage; therefore, the second type of alarm is cancelled.

[0054] The third type: Control device 30 monitors the third trend of external load changes, detects the first and second distance data corresponding to the current moment. If the horizontal deformation calculated based on the first and second distance data corresponding to the current moment is greater than the preset horizontal deformation, the vertical deformation calculated based on the first and second distance data corresponding to the current moment is greater than the preset vertical deformation, and / or the lateral angle deformation calculated based on the first and second distance data corresponding to the current moment is greater than the preset angle deformation, then control device 30 issues a third type of alarm. It should be noted that the third trend is that the external load is less than the second preset load threshold, indicating that the external load on the I-beam 40 has not exceeded the second preset load threshold, that is, the external load at this time will not affect the I-beam 40. If, under these circumstances, any one of the horizontal deformation, vertical deformation, and angle deformation is greater than the preset deformation, it indicates that the deformation of the I-beam 40 is not caused by the external load, but by the quality of the I-beam 40 itself or improper installation. In this situation, a third-class alarm is issued, indicating that the I-beam 40 has deformed without being subjected to an external load.

[0055] To better monitor the condition of the I-beam 40, in one example, the length of the I-beam 40 exceeds a preset length. At least two distance monitoring devices 10 and external load monitoring devices 20 are installed on the I-beam 40. It should be noted that the preset length can be set according to actual needs, for example, a preset length of 20 meters, 30 meters, or 40 meters, etc. The number of distance monitoring devices 10 and external load monitoring devices 20 can be set according to the length of the I-beam 40. In one example, the distance monitoring devices 10 are evenly distributed on the I-beam 40. In another example, the external load monitoring devices 20 are evenly distributed on the I-beam 40. Each distance monitoring device 10 and each external load monitoring device 20 is communicatively connected to the control device 30.

[0056] To conserve energy for monitoring when the I-beam 40 is not subjected to a strong external load, the control device 30 controls each distance monitoring device 10 to collect distance data periodically when the external load is less than or equal to a second preset load, and controls the staggered start-up of each distance monitoring device 10. In one example, each distance monitoring device 10 collects distance data at intervals of 1 minute, 5 minutes, or 10 minutes, which can be set according to actual needs, and the intervals of each distance monitoring device 10 can be the same or different. The staggered start-up of each distance monitoring device 10 means that the distance monitoring devices 10 do not collect distance data at the same time.

[0057] Each external load monitoring device 20 is controlled to collect external load data periodically, and the starting times of each external load monitoring device 20 are staggered. In one example, each external load monitoring device 20 collects distance data every 2 minutes, 4 minutes, or 8 minutes; the specific interval can be set according to actual needs. The periods for each external load monitoring device 20 can be the same or different. The staggered starting times mean that the external load monitoring devices 20 do not collect distance data at the same time.

[0058] To effectively monitor the condition of the I-beam 40 under strong external loads, the control device 30 controls each distance monitoring device 10 to collect distance data in real time when the external load exceeds a second preset load; and controls each external load monitoring device 20 to collect external load data in real time.

[0059] It should be noted that the control device 30 can send first-class alarms, second-class alarms, and third-class alarms to terminal devices such as servers, remote computers, and staff mobile terminals.

[0060] The reflector 17 is positioned relative to the mounting plate 11. For example, the reflector 17 can be mounted on a bridge pier or bridge deck. The reflector 17 is used to transmit signals emitted by the first ranging device 13 and the second ranging device 15, enabling the first ranging device 13 and the second ranging device 15 to measure the distance between themselves and the reflector 17. To further monitor the horizontal deformation of the I-beam 40, the length of the reflector 17 is equal to twice the horizontal deformation safety threshold of the I-beam 40. When the I-beam 40 is not deformed, the signals emitted by the first ranging device 13 and the second ranging device 15 hit the centerline of the reflector 17. The horizontal deformation safety threshold is the maximum acceptable horizontal deformation for the I-beam 40, which can be calculated theoretically. The measurement principle is as follows: When the I-beam 40 undergoes horizontal deformation, the position of the first ranging device 13 relative to the reflector 17 changes. When the deformation is large enough, the signal emitted by the first ranging device 13 cannot reach the reflector 17, and the distance data measured by the first ranging device 13 suddenly changes (suddenly exceeding the maximum distance between the first ranging device 13 and the reflector 17 when the I-beam 40 is not deformed). The control device 30 can determine that the horizontal deformation exceeds the safe range based on this sudden change in distance data. The shape, material, and size of the reflector 17 can be determined according to actual needs; for example, the reflector 17 can be made of rectangular steel plate.

[0061] Due to the different installation positions of the first ranging device 13 and the second ranging device 15, the distances measured by the first ranging device 13 and the second ranging device 15 to the I-beam 40 may be different. This difference in distance will lead to measurement errors. Since the closer the distance, the smaller the deformation reflected, and the farther the distance, the larger the deformation reflected, in order to avoid this error, it is necessary to ensure that when the I-beam 40 is not deformed, the line connecting the signal transmission port of the first ranging device 13 and the signal transmission port of the second ranging device 15 is parallel to the outer extension of the upper flange of the I-beam. That is, to ensure that the distances measured by the first ranging device 13 and the second ranging device to the upper flange of the I-beam are the same, so that the deformation of the I-beam 40 reflected by both devices is at the same level.

[0062] To ensure timely alarm activation, as shown in the figure, the construction deformation monitoring system for the I-beam 40 of this application also includes an alarm device; the control device 30 is communicatively connected to the alarm device. When the control device 30 determines that the vertical deformation, horizontal deformation, and / or lateral angular deformation exceed the corresponding thresholds, it controls the alarm device to sound an alarm. In one example, the alarm device is a light alarm, an audible alarm, or an audible and visual alarm.

[0063] The construction deformation monitoring system for I-beams 40 provided in the embodiments of this application includes a distance monitoring device 10, an external load monitoring device 20, and a control device 30. The distance monitoring device 10 includes a mounting plate 11, a first distance measuring device 13, a second distance measuring device 15, and a reflector 17. The control device 30 is communicatively connected to the first distance measuring device 13, the second distance measuring device 15, and the external load monitoring device 20, respectively, so that the control device 30 receives first distance data to the reflector 17 measured by the first distance measuring device 13, receives second distance data to the reflector 17 measured by the second distance measuring device 15, and receives the external load monitored by the external load monitoring device 20. The control device 30 monitors a first trend of change in the external load, and selects the moment when the external load equals a first preset load threshold within the first trend as a reference moment, and calculates the duration from the current moment to the reference moment. When the duration equals a first preset duration, the control device 30 detects the first distance data and the second distance data corresponding to the current moment. If the horizontal deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset horizontal deformation, the vertical deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset vertical deformation, and / or the lateral angle deformation calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset angle deformation, then the control device 30 issues a first-type alarm. The first-type alarm indicates that the I-beam 40 has undergone permanent deformation under external load. This application determines the deformation of the I-beam 40 caused by the external load by monitoring the external load borne by the I-beam 40 and combining the acquired first distance data and the second distance data. In addition, even when the external load is zero, the deformation of the I-beam 40 can still be determined by the first distance data and the second distance data. This allows for comprehensive monitoring of the usage status of the I-beam 40, enabling timely repair of deformation and improving the safety performance of the I-beam 40.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A steel plate combined continuous beam construction deformation monitoring and early warning system, characterized in that, The distance monitoring device, the external load monitoring device and the control device are included; the external load monitoring device is installed on the I-beam for monitoring the external load borne by the I-beam due to external factors; The distance monitoring device includes a mounting plate, a first distance measuring device, a second distance measuring device and a reflecting plate; The mounting plate includes a mounting portion and an extension portion, the mounting plate is mounted on the upper flange plate of the I-beam through the mounting portion, and the extension portion extends outwardly from the I-beam; the first distance measuring device and the second distance measuring device are installed on the extension portion; the reflecting plate is arranged relative to the mounting plate for reflecting the distance measuring signals emitted by the first distance measuring device and the second distance measuring device; The signal emission direction of the first distance measuring device is always the same as the direction of gravity as the I-beam deforms, the signal emission direction of the second distance measuring device is always perpendicular to the plate surface of the mounting plate as the I-beam deforms, and when the I-beam is not deformed, the line connecting the signal emission port of the first distance measuring device and the signal emission port of the second distance measuring device is parallel to the extension of the upper flange plate of the I-beam; the control device is in communication connection with the first distance measuring device, the second distance measuring device and the external load monitoring device respectively; The control device receives the first distance data measured by the first distance measuring device relative to the reflecting plate, receives the second distance data measured by the second distance measuring device relative to the reflecting plate, and receives the external load monitored by the external load monitoring device; The control device monitors the first change trend of the external load, picks up the moment when the external load is equal to the first preset load threshold in the first change trend as a reference moment, and calculates the time length from the current moment to the reference moment; the first change trend is that the external load changes from greater than the first preset load threshold to less than the second preset load threshold; the first preset load threshold is greater than the second preset load threshold; When the time length is equal to the first preset time length, the control device detects the first distance data and the second distance data corresponding to the current moment, and if the horizontal deformation amount calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset horizontal deformation amount, the vertical deformation amount calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset vertical deformation amount, and / or the lateral angle deformation amount calculated based on the first distance data and the second distance data corresponding to the current moment is greater than the preset angle deformation amount, the control device issues a first type of alarm; the first type of alarm indicates that the I-beam has permanent deformation under the external load.

2. The steel plate combined continuous beam construction deformation monitoring and early warning system according to claim 1, characterized in that, The control device monitors a second change trend of the external load, detects the first distance data and the second distance data corresponding to the current time when the external load in the second change trend is equal to the first preset load threshold, and issues a second type of alarm if the horizontal deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than the preset horizontal deformation, the vertical deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than the preset vertical deformation, and / or the lateral corner deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than the preset corner deformation. The second change trend is that the external load changes from being less than the second preset load threshold to being greater than the second preset load threshold and less than the first preset load threshold, and the second type of alarm indicates that the I-beam is deformed under the external load.

3. The steel plate combined continuous beam construction deformation monitoring and early warning system according to claim 2, characterized in that, After the second change trend, the external load changes from being greater than the second preset load threshold to being less than the second preset load threshold. The second type of alarm is canceled if the horizontal deformation calculated based on the first distance data and the second distance data corresponding to the current time is less than or equal to the preset horizontal deformation, the vertical deformation calculated based on the first distance data and the second distance data corresponding to the current time is less than or equal to the preset vertical deformation, and the lateral corner deformation calculated based on the first distance data and the second distance data corresponding to the current time is less than or equal to the preset corner deformation.

4. The steel plate combined continuous beam construction deformation monitoring and early warning system according to claim 1, characterized in that, The control device monitors a third change trend of the external load, detects the first distance data and the second distance data corresponding to the current time, and issues a third type of alarm if the horizontal deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than the preset horizontal deformation, the vertical deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than the preset vertical deformation, and / or the lateral corner deformation calculated based on the first distance data and the second distance data corresponding to the current time is greater than the preset corner deformation. The third change trend is that the external load is less than the second preset load threshold, and the third type of alarm indicates that the I-beam is deformed without external load.

5. The steel plate combined continuous beam construction deformation monitoring and early warning system according to claim 1, characterized in that, The length of the I-beam exceeds a preset length, and at least two distance monitoring devices and external load monitoring devices are installed on the I-beam. The control device controls each distance monitoring device to collect distance data periodically and controls each distance monitoring device to start at different times when the external load is less than or equal to the second preset load, and controls each external load monitoring device to collect the external load periodically and controls each external load monitoring device to start at different times. The control device controls each distance monitoring device to collect distance data in real time when the external load is greater than the second preset load; and controls each external load monitoring device to collect the external load in real time.

6. The steel plate assembly continuous beam construction deformation monitoring and early warning system according to any one of claims 1 to 5, characterized in that, The external load monitoring device is one or any combination of a pressure detector, a torque monitor and a wind speed detector.

7. The steel plate assembly continuous beam construction deformation monitoring and early warning system according to any one of claims 1 to 5, characterized in that, The length of the reflection plate is equal to twice the horizontal deformation safety threshold of the I-beam; When the I-beam is not deformed, the signals emitted by the first distance measuring device and the second distance measuring device hit the middle line of the reflection plate.

8. The steel plate assembly continuous beam construction deformation monitoring and early warning system according to any one of claims 1 to 5, characterized in that, Further comprising an alarm device; The control device is in communication connection with the alarm device, and controls the alarm device to alarm.

9. The steel plate assembly continuous beam construction deformation monitoring and early warning system according to any one of claims 1 to 5, characterized in that, The first distance measuring device is a rotary distance measuring device, so that the signal emission direction of the first distance measuring device is always the same as the direction of gravity as the I-beam deforms; The second distance measuring device is a fixed distance measuring device, so that the signal emission direction of the second distance measuring device is always perpendicular to the surface of the mounting plate as the I-beam deforms.

10. The steel plate combined continuous beam construction deformation monitoring and early warning system according to claim 9, characterized in that, The first distance measuring device is a laser range finder; and the second distance measuring device is a laser range finder.

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