Stress sensor and system for monitoring structural deformation of ancient pagoda

Abstract

The invention discloses a stress sensor and system for monitoring structural deformation of an ancient pagoda. The stress sensor for monitoring structural deformation of the ancient pagoda comprises a hydraulic cylinder, two stress detection assemblies, a temperature sensor and a humidity sensor, the two stress detection assemblies are connected to the two ends of the hydraulic cylinder respectively. Wherein the stress detection assembly comprises a bearing plate, a mounting plate, a plurality of springs and a plurality of strain type pressure boxes; the bearing plate and the mounting plate are arranged in parallel, and the mounting plate is connected to the end part of the hydraulic cylinder; the plurality of strain type pressure boxes are mounted on the mounting plate; the multiple springs are located between the bearing plate and the mounting plate, and the two ends of the multiple springs are connected to the multiple strain type pressure boxes and the bearing plate correspondingly. And the temperature sensor and the humidity sensor are connected to one of the mounting plates. According to the invention, nondestructive monitoring of the ancient building is realized, and accurate monitoring of internal structure stress change caused by temperature and humidity change and analysis of damage development trend are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ancient building monitoring, and in particular to a stress sensor and system for monitoring structural deformation of an ancient tower. BACKGROUND

[0002] As important historical and cultural heritage, masonry ancient towers carry rich historical information and artistic value. Such buildings usually adopt masonry construction technology, and the structural stability thereof is directly related to the preservation state and continuity of cultural relics. In actual environment, masonry ancient towers are exposed to natural climate conditions for a long time and are continuously affected by temperature and humidity changes. With the fluctuation of temperature and humidity, the building materials of the tower body will swell and shrink slightly.

[0003] Although the above-mentioned slight physical strain is difficult to directly and accurately measure by conventional means, the structural stress change caused thereby is relatively significant and easy to monitor. However, in the existing field of ancient building monitoring, the stress monitoring system using temperature and humidity sensors for masonry ancient building monitoring is often limited to the surface and is difficult to identify the internal force change and damage development trend of the structure and materials. SUMMARY

[0004] The stress sensor and system for monitoring structural deformation of an ancient tower provided by the embodiments of the present application solve the technical problem that the existing stress monitoring system is difficult to identify the internal force change and damage development trend of the structure and materials.

[0005] In a first aspect, the embodiments of the present application provide a stress sensor for monitoring structural deformation of an ancient tower, comprising: a hydraulic cylinder; two stress detection assemblies connected to two ends of the hydraulic cylinder respectively; wherein the stress detection assembly comprises a pressure bearing plate, a mounting plate, a plurality of springs and a plurality of strain pressure boxes; the pressure bearing plate and the mounting plate are arranged in parallel, and the mounting plate is connected to the end of the hydraulic cylinder; the plurality of strain pressure boxes are installed on the mounting plate and face the pressure bearing plate; the plurality of springs are located between the pressure bearing plate and the mounting plate, and the two ends of the plurality of springs are connected to the plurality of strain pressure boxes and the pressure bearing plate respectively; a temperature sensor located between the two stress detection assemblies and connected to one of the mounting plates; and a humidity sensor located between the two stress detection assemblies and connected to one of the mounting plates.

[0006] In combination with the first aspect, in a possible implementation manner, the stress detection assembly further comprises a wireless transmission module connected to the plurality of strain pressure boxes and configured to receive stress data of the plurality of strain pressure boxes and send a signal to a terminal.

[0007] With reference to the first aspect, in a possible implementation manner, the stress detection assembly further comprises a displacement lock between the pressure bearing plate and the mounting plate, two ends of the displacement lock being connected to the pressure bearing plate and the mounting plate respectively and configured to fix the relative position of the pressure bearing plate and the mounting plate.

[0008] With reference to the first aspect, in a possible implementation manner, the displacement lock comprises a slide rod, a sleeve and a fixing member, one end of the sleeve being connected to the mounting plate, the other end of the sleeve being towards the pressure bearing plate, the sleeve being provided with a first fixing hole, one end of the slide rod being connected to the pressure bearing plate, the other end of the slide rod extending into the sleeve, the slide rod being provided with a plurality of second fixing holes, and the plurality of second fixing holes being arranged along the length direction of the slide rod, and the fixing member being used for penetrating through the first fixing hole and one of the second fixing holes.

[0009] With reference to the first aspect, in a possible implementation manner, the temperature sensor and the humidity sensor are wireless sensors.

[0010] In the second aspect, the embodiments of the present application provide a system for monitoring deformation of a tower structure, the system comprising at least one stress sensor for monitoring deformation of a tower structure as described in the first aspect or any possible implementation manner of the first aspect; a data acquisition and transmission module, the data acquisition and transmission module being in communication connection with the stress sensor, and being configured to receive temperature and humidity data and stress data collected by the stress sensor; and a data processing module, the data processing module being connected with the data acquisition and transmission module and being installed with a tower structure damage evolution model, the data processing module being configured to receive the temperature and humidity data and the stress data sent by the data acquisition and transmission module, analyze the temperature and humidity data and the stress data using the tower structure damage evolution model, evaluate the structural stability of the tower, and predict possible structural damage and deformation.

[0011] With reference to the second aspect, in a possible implementation manner, the data processing module is configured to receive wind data, and when the change of the temperature and humidity data is within a preset stable range, analyze the wind data and the stress data using the tower structure damage evolution model, evaluate the structural stability of the tower, and predict possible structural damage and deformation.

[0012] With reference to the second aspect, in a possible implementation manner, the system for monitoring deformation of a tower structure further comprises a display module, the display module being in signal connection with the data processing module and being configured to display the temperature and humidity data, the stress data and a prediction result.

[0013] With reference to the second aspect, in a possible implementation manner, the system for monitoring deformation of the ancient tower structure further comprises a warning module, which is connected to the data processing module and configured to receive the prediction result and send a warning signal when structural damage or deformation exceeding a preset normal range is likely to occur.

[0014] The technical solutions provided in the embodiments of the present application have at least the following technical effects: The stress sensor for monitoring deformation of an ancient tower structure provided in the embodiments of the present application can detect damaged bricks in the tower body, realizes nondestructive monitoring of the ancient building, and realizes accurate monitoring of internal structural stress changes caused by temperature and humidity changes, and can analyze damage development trends according to continuous changes in structural stress. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application or the prior art. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 A structural schematic diagram of the stress sensor for monitoring deformation of an ancient tower structure provided in the embodiments of the present application is shown in the figure. Figure 2 A schematic diagram of the spring and the strain pressure box provided in the mounting plate provided in the embodiments of the present application is shown in the figure. Figure 3 A structural schematic diagram of the displacement lock provided in the embodiments of the present application is shown in the figure. Figure 4 A schematic diagram of the system for monitoring deformation of an ancient tower structure provided in the embodiments of the present application is shown in the figure.

[0017] The figure shows: 1-hydraulic cylinder; 2-stress detection assembly; 21-pressure bearing plate; 22-mounting plate; 23-spring; 24-strain pressure box; 25-displacement lock; 251-sliding rod; 252-sleeve; 253-fixing piece; 3-temperature sensor; 4-humidity sensor; 5-wireless transmission module; 100-stress sensor; 200-data acquisition and transmission module; 300-data processing module; 400-display module; 500-warning module. DETAILED DESCRIPTION

[0018] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0019] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0020] The stress sensor 100 for monitoring the deformation of the ancient tower structure provided by the embodiments of the present application is shown in FIGS. 1 to 3. Figure 1 and Figure 2 The stress sensor 100 includes a hydraulic cylinder 1, two stress detection assemblies 2, a temperature sensor 3 and a humidity sensor 4.

[0021] The two stress detection assemblies 2 are respectively connected to the two ends of the hydraulic cylinder 1. The stress detection assembly 2 includes a pressure bearing plate 21, a mounting plate 22, a plurality of springs 23 and a plurality of strain pressure boxes 24. The pressure bearing plate 21 is arranged in parallel with the mounting plate 22, and the mounting plate 22 is connected to the end of the hydraulic cylinder 1. The plurality of strain pressure boxes 24 are mounted on the mounting plate 22. The plurality of springs 23 are located between the pressure bearing plate 21 and the mounting plate 22, and the two ends of the plurality of springs 23 are respectively connected to the plurality of strain pressure boxes 24 and the pressure bearing plate 21.

[0022] The stress sensor 100 can be provided in the size of green bricks, so as to replace the damaged bricks in the tower body and realize non-destructive installation. When installing, the stress sensor 100 is placed in the green brick vacancy position, and then a pre-pressure is applied through the hydraulic cylinder 1. The pre-pressure is consistent with the pressure received by the other brick masonry in the ancient tower. When the tower body expands or shrinks due to changes in temperature and humidity, the spring 23 will produce a corresponding deformation displacement.

[0023] The temperature sensor 3 is located between the two stress detection assemblies 2 and is connected to one of the mounting plates 22.

[0024] The plurality of strain pressure boxes 24 monitor the Guta in real time, convert into electrical signals through the piezoelectric effect, and realize accurate monitoring of the stress changes of the internal structure caused by temperature and humidity changes. The staff can analyze the damage development trend according to the continuous changes of the structural stress.

[0025] Continuing to refer to Figure 1 In the embodiment of the present application, the stress detection assembly 2 further comprises a wireless transmission module 5 connected to the plurality of strain pressure boxes 24, configured to receive stress data of the plurality of strain pressure boxes 24 and send signals to the terminal.

[0026] The wireless transmission module 5 can be a Bluetooth module, a WiFi module, etc.

[0027] In the embodiment of the present application, the stress detection assembly 2 further comprises a displacement lock 25 located between the pressure bearing plate 21 and the mounting plate 22. The two ends of the displacement lock 25 are respectively connected to the pressure bearing plate 21 and the mounting plate 22, and are configured to fix the relative position of the pressure bearing plate 21 and the mounting plate 22.

[0028] When the stress sensor 100 is installed in the hollow position of the blue brick, the displacement lock 25 is locked. After the stress sensor 100 is completely placed in the hollow position of the blue brick and the hydraulic cylinder 1 applies a pre-pressure, the displacement lock 25 is unlocked.

[0029] Specifically, as Figure 3 shown, the displacement lock 25 comprises a slide rod 251, a sleeve 252 and a fixing piece 253. One end of the sleeve 252 is connected to the mounting plate 22, the other end of the sleeve 252 faces the pressure bearing plate 21, and the sleeve 252 is provided with a first fixing hole. One end of the slide rod 251 is connected to the pressure bearing plate 21, the other end of the slide rod 251 extends into the sleeve 252, and the slide rod 251 is provided with a plurality of second fixing holes, wherein the plurality of second fixing holes are arranged along the length direction of the slide rod 251. The fixing piece 253 is used to pass through the first fixing hole and one of the second fixing holes.

[0030] Further, the temperature sensor 3 and the humidity sensor 4 are both wireless sensors.

[0031] As Figure 4As shown, the embodiments of the present application also provide a system for monitoring deformation of a pagoda structure, which comprises a data acquisition and transmission module 200, a data processing module 300, and the stress sensor 100 for monitoring deformation of a pagoda structure described above. The data acquisition and transmission module 200 is in communication connection with the stress sensor 100, and is configured to receive the temperature and humidity data and the stress data collected by the stress sensor 100. The data processing module 300 is connected with the data acquisition and transmission module 200, and is installed with a pagoda structure damage evolution model. The data processing module 300 is configured to: receive the temperature and humidity data and the stress data sent by the data acquisition and transmission module 200, analyze the temperature and humidity data and the stress data using the pagoda structure damage evolution model, evaluate the structural stability of the pagoda, and predict possible structural damage and deformation.

[0032] Exemplarily, the data collected by the data acquisition and transmission module 200 can be sent to the data processing module 300 quickly and stably by means of wireless transmission technologies such as Bluetooth, Wi-Fi, or mobile network, so as to ensure the timeliness and reliability of data transmission.

[0033] After receiving the temperature and humidity data and the stress data, the data processing module 300 analyzes the data using the pagoda structure damage evolution model, evaluates the structural stability of the pagoda, and gives a stability level, for example, the stability level can be divided into very safe, safe, dangerous, and very dangerous.

[0034] The pagoda structure damage evolution model is trained by historical data of temperature and humidity, historical data of stress, and corresponding structural damage and deformation. Finally, the pagoda structure damage evolution model establishes a brick and stone pagoda monitoring system with temperature and humidity as indexes and stress gradient evolution as the focus based on long-term monitoring data, and clarifies the internal relationship between temperature and humidity data and pagoda damage evolution trend and stability performance indexes.

[0035] Further, the data processing module 300 is also configured to: receive wind data, and when the change of the temperature and humidity data is within a preset stable range, analyze the wind data and the stress data using the pagoda structure damage evolution model, evaluate the structural stability of the pagoda, and predict possible structural damage and deformation.

[0036] Exemplarily, the preset stable range can be: the change amount of the average temperature data of adjacent two days is within [-5℃, 5℃], and the change amount of the average humidity data of adjacent two days is within [-10%, 10%].

[0037] When the change of the temperature and humidity data is within the preset stable range, the influence of wind on the pagoda will become significant. Through the above evaluation and prediction process, the monitoring process of the system for monitoring deformation of a pagoda structure is more comprehensive, and the evaluation and prediction results are also more accurate.

[0038] The guta structure damage evolution model is trained by wind history data and corresponding structure damage and deformation conditions, so that the guta structure damage evolution model clarifies the internal relationship between wind data and guta damage evolution trend and stability performance index.

[0039] As Figure 4 shown, the system for monitoring guta structure deformation further includes a display module 400, which is signal connected to the data processing module 300 and configured to display temperature and humidity data, stress data and prediction results.

[0040] The staff in charge of guta monitoring can intuitively see the temperature and humidity, stress data measured by each of the above stress sensors 100, and the prediction of possible structure damage and deformation of the guta through the display module 400.

[0041] Continuing to refer to Figure 4 , the system for monitoring guta structure deformation further includes a warning module 500, which is signal connected to the data processing module 300 and configured to receive prediction results and issue a warning signal when the possible structure damage or the possible deformation exceeds the preset normal range.

[0042] Illustratively, the preset normal range can be [-1mm, 1mm], and the warning signal can be light flashing, warning bell sound, etc.

[0043] The method for monitoring guta structure deformation using the system for monitoring guta structure deformation is as follows.

[0044] Preparation and installation: according to the structural characteristics and historical data of the guta, determine the weak areas and key parts of the guta structure, and install the above stress sensors 100 at these positions. During installation, strictly follow the original blue brick compression strength to apply pre-pressure to the stress sensor 100, and carefully do the pointing treatment to ensure that the stress sensor 100 is closely combined with the guta structure.

[0045] Data acquisition: start the data acquisition and transmission module 200 to collect temperature and humidity data and stress data from the stress sensor 100 in real time. The data acquisition frequency can be flexibly adjusted according to the actual condition of the guta and the speed of environmental change. In seasons or periods of rapid environmental change, appropriately increase the acquisition frequency of the data acquisition and transmission module 200 to ensure that comprehensive and effective monitoring data is obtained.

[0046] Data processing and analysis: using the ancient tower structure damage evolution model to analyze the temperature and humidity data and stress data, evaluating the structural stability of the ancient tower, and predicting the possible structural damage and deformation; when the temperature and humidity data is within the preset stable range, using the ancient tower structure damage evolution model to analyze the wind force data and stress data, evaluating the structural stability of the ancient tower, and predicting the possible structural damage and deformation; the display module 400 displays the temperature and humidity data, stress data and prediction results; the warning module 500 sends a warning signal when the possible structural damage exceeds the first preset normal range, or the possible deformation exceeds the preset normal range.

[0047] System optimization and verification: the system for monitoring the deformation of the ancient tower structure and the data processing results are checked and verified regularly, by comparing with the actual state of the ancient tower, such as observing whether the ancient tower has cracks, deformation and other conditions, the system for monitoring the deformation of the ancient tower structure and the data processing module 300 are adjusted and optimized in time to improve the accuracy and reliability of the monitoring.

[0048] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0049] The above examples are only used to illustrate the technical solutions of the present application, and are not limited to the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A stress sensor for monitoring the deformation of an ancient pagoda structure, characterized in that: include: Hydraulic cylinder; Two stress detection assemblies, the two stress detection assemblies are respectively connected to the two ends of the hydraulic cylinder; wherein the stress detection assembly includes a pressure plate, a mounting plate, a plurality of springs and a plurality of strain gauge pressure cells; The pressure-bearing plate is arranged parallel to the mounting plate, and the mounting plate is connected to the end of the hydraulic cylinder; the multiple strain gauge pressure cells are mounted on the mounting plate and face the pressure-bearing plate; the multiple springs are located between the pressure-bearing plate and the mounting plate, and the ends of the multiple springs are respectively connected to the multiple strain gauge pressure cells and the pressure-bearing plate; a temperature sensor, the temperature sensor being located between the two stress detection assemblies and connected to one of the mounting plates; and The humidity sensor and the temperature sensor are located between the two stress detection components and are connected to one of the mounting plates.

2. The stress sensor for monitoring the deformation of the ancient tower structure according to claim 1 is characterized in that: The stress detection component further includes a wireless transmission module, which is connected to the multiple strain gauge pressure cells and is configured to receive stress data from the multiple strain gauge pressure cells and send signals to a terminal.

3. The stress sensor for monitoring the deformation of the ancient tower structure according to claim 1 or 2, characterized in that: The stress detection assembly further includes a displacement lock located between the pressure plate and the mounting plate; The two ends of the displacement lock are respectively connected to the pressure plate and the mounting plate, and are configured to fix the relative position of the pressure plate and the mounting plate.

4. The stress sensor for monitoring the deformation of the ancient tower structure according to claim 3 is characterized in that: The displacement lock comprises a sliding rod, a sleeve and a fixing piece; One end of the sleeve is connected to the mounting plate, the other end of the sleeve faces the pressure plate, and the sleeve is provided with a first fixing hole; One end of the sliding rod is connected to the pressure plate, and the other end of the sliding rod extends into the sleeve. The sliding rod is provided with a plurality of second fixing holes, wherein the plurality of second fixing holes are arranged along the length direction of the sliding rod; The fixing member is used to pass through the first fixing hole and one of the second fixing holes to fix the sleeve and the sliding rod.

5. The stress sensor for monitoring the deformation of the ancient tower structure according to claim 1 is characterized in that: The temperature sensor and the humidity sensor are both wireless sensors.

6. A system for monitoring the deformation of ancient pagoda structures, characterized in that: include: At least one stress sensor for monitoring the deformation of the ancient tower structure as described in any one of claims 1 to 5; a data acquisition and transmission module, the data acquisition and transmission module being communicatively connected to the stress sensor and configured to receive the temperature and humidity data and stress data collected by the stress sensor; A data processing module is connected to the data acquisition and transmission module and is equipped with an ancient tower structural damage evolution model. The data processing module is configured to: receive the temperature and humidity data and the stress data sent by the data acquisition and transmission module, use the ancient tower structural damage evolution model to analyze the temperature and humidity data and the stress data, evaluate the structural stability of the ancient tower, and predict possible structural damage and deformation.

7. The system for monitoring the deformation of ancient pagoda structures according to claim 6 is characterized in that: The data processing module is configured to: receive wind data, and when the changes in the temperature and humidity data are within a preset stable range, use the ancient tower structural damage evolution model to analyze the wind data and the stress data, evaluate the structural stability of the ancient tower, and predict possible structural damage and deformation.

8. The system for monitoring the deformation of ancient pagoda structures according to claim 6 is characterized in that: Also includes: A display module is signal-connected to the data processing module and is configured to display the temperature and humidity data, the stress data, and the prediction results.

9. The system for monitoring the deformation of ancient pagoda structures according to claim 6, characterized in that: Also includes: An early warning module is signal-connected to the data processing module and is configured to receive the prediction result and issue an early warning signal when possible structural damage or possible deformation exceeds a preset normal range.

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