Concrete strain measuring device

Abstract

The utility model provides a kind of concrete strain measuring device, it is related to concrete strain measurement technical field, by setting multiple vibrating wire, and each vibrating wire is connected with detection component, user can measure the strain in different directions when using, by comparing the size difference of strain variable collected in different directions, the position of strain occurrence in concrete can be judged, the functionality when using device is increased, the detection effect is improved, the intelligence of device is improved, and the technical problem that existing concrete strain measuring device cannot judge the specific position and direction of strain occurrence in prior art is alleviated.

Description

Technical Field

[0001] This utility model relates to the field of concrete strain measurement technology, and in particular to a concrete strain measurement device. Background Technology

[0002] As one of the most important materials in modern architecture, concrete structures are of paramount importance in terms of safety and durability. Concrete strain, as a crucial indicator reflecting the stress state of a structure, is essential for accurately measuring its safety performance. Currently, the vibrating wire strain gauge method is one of the main methods for measuring concrete strain. Its principle is to calculate the strain value by measuring the change in the vibration frequency of a vibrating wire strain sensor embedded in the concrete.

[0003] In existing technologies, vibrating wire strain sensors typically consist of a steel wire, an electromagnetic coil, and a housing. When concrete undergoes strain, the tension of the steel wire changes, thereby altering its natural vibration frequency. By measuring this frequency change, the strain value of the concrete can be calculated. This measurement method has advantages such as good stability and strong anti-interference ability, and has been widely used in the long-term monitoring of large concrete structures such as bridges, dams, and tunnels.

[0004] Existing patent CN112414603A proposes an improved scheme combining a vibrating wire strain sensor and an ultrasonic sensor, addressing the issues of lifespan and measurement accuracy of a single sensor through data complementarity between the two. However, existing vibrating wire strain sensors typically contain only a single vibrating wire. While this design can accurately measure the magnitude of strain, it cannot determine the specific location and direction of strain occurrence. In practical engineering applications, especially under complex stress environments, this single-direction measurement method often fails to comprehensively reflect the actual stress state of concrete structures, limiting the sensor's applicability and measurement effectiveness. Utility Model Content

[0005] The purpose of this invention is to provide a concrete strain measuring device to alleviate the technical problem that existing concrete strain measuring devices cannot determine the specific location and direction of strain occurrence.

[0006] The concrete strain measuring device provided by this utility model includes: a main body mechanism;

[0007] The main structure includes a first end seat, a second end seat, a vibrating string, and a detection component;

[0008] The vibrating wires are arranged in multiple directions around the axis of the first end seat and the second end seat;

[0009] One end of each vibrating string is connected to the first end seat, and the other end of each vibrating string passes through the second end seat and is connected to the detection component; and each vibrating string is connected to the second end seat.

[0010] Both the first end seat and the second end seat are used to transfer the concrete strain force to the vibrating wire so that the vibrating wire vibrates. The detection component is used to calculate the strain force value and the strain force orientation based on the vibration frequency of the vibrating wire.

[0011] In an optional implementation,

[0012] The detection component includes a diaphragm and a fixed electrode plate;

[0013] Each of the vibrating strings is provided with a diaphragm at the end away from the first end seat, and a fixed electrode plate is fixedly provided on the side of each diaphragm away from the vibrating string.

[0014] All of the diaphragms are made of metal, and an insulating medium is provided between each diaphragm and the corresponding fixed electrode plate.

[0015] In an optional implementation,

[0016] The detection component also includes electrode leads;

[0017] Each of the fixed electrode plates is correspondingly and fixedly provided with an electrode lead, and one end of each of the multiple electrode leads is fixedly connected to a connector.

[0018] In an optional implementation,

[0019] The main structure also includes an adjustment housing;

[0020] An adjustment knob is rotatably provided at one end of the adjustment housing, and a threaded rod is fixedly provided on the adjustment knob. One end of the threaded rod is threadedly connected to the first end seat.

[0021] In an optional implementation,

[0022] A protective tube is fixedly installed at one end of the adjusting shell, and an electromagnetic excitation coil is fixedly installed inside the protective tube. The electromagnetic excitation coil is connected to an external excitation source through a wire.

[0023] In an optional implementation,

[0024] The concrete strain measuring device also includes a fixing mechanism;

[0025] The first end seat is provided with a first fixing hole, and the second end seat is provided with a second fixing hole. Both the first fixing hole and the second fixing hole are connected to the fixing mechanism, which is used to fix the object in the concrete.

[0026] In an optional implementation,

[0027] The fixing mechanism includes a connecting sleeve, and a fixing plate is fixedly provided at the bottom end of the connecting sleeve;

[0028] The fixing plate is threaded with positioning bolts at both ends, and the top of the connecting sleeve is threaded with a fixing knob, which is used to extend into the first fixing hole or the second fixing hole.

[0029] In an optional implementation,

[0030] The adjusting housing is provided with an adjusting groove, and the fixing knob can extend through the adjusting groove into the first fixing hole.

[0031] In an optional implementation,

[0032] A temperature sensor is fixedly mounted on one side surface of the second end seat. One end of the temperature sensor is fixedly connected to a sensor lead, and one end of the sensor lead is connected to the connector.

[0033] In an optional implementation,

[0034] A protective shell is fixedly provided at one end of the second end seat, and a waterproof ring is fixedly provided at the middle position of the inner surface of one side of the protective shell. The protective shell is used to cover the diaphragm, the fixed electrode plate, the electrode lead and the sensor lead.

[0035] A waterproof ring is provided on the end face of the protective shell near the connector.

[0036] The concrete strain measuring device provided by this utility model, by setting multiple vibrating wires, each of which is connected to the detection component, allows the user to measure strain in different directions. By comparing the differences in the magnitude of the strain collected in different directions, the location of strain in the concrete can be determined, increasing the functionality of the device, improving the detection effect, enhancing the intelligence of the device, and alleviating the technical problem that existing concrete strain measuring devices cannot determine the specific location and direction of strain. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 A schematic diagram of the overall structure of the concrete strain measuring device provided in this embodiment of the utility model;

[0039] Figure 2 A schematic diagram of the overall structure of the concrete strain measuring device provided in an embodiment of this utility model from another perspective;

[0040] Figure 3 A schematic diagram of the internal structure of the concrete strain measuring device provided in this embodiment of the utility model;

[0041] Figure 4 A schematic diagram of the internal structure of the concrete strain measuring device provided in an embodiment of this utility model from another perspective;

[0042] Figure 5 A structural cross-sectional view of the concrete strain measuring device provided in an embodiment of this utility model;

[0043] Figure 6 This is a schematic diagram of the fixing mechanism in the concrete strain measuring device provided in this embodiment of the utility model.

[0044] Icons: 1-Main body; 2-Fixing mechanism; 101-Adjusting housing; 102-First fixing hole; 103-Adjusting knob; 104-First end seat; 105-Vibrating string; 106-Electromagnetic excitation coil; 107-Protective tube; 108-Second end seat; 109-Second fixing hole; 110-Diaphragm; 111-Fixing electrode plate; 112-Electrode lead; 113-Protective housing; 114-Waterproof ring; 115-Threaded rod; 116-Adjusting groove; 117-Temperature sensor; 118-Sensor lead; 119-Connector; 201-Fixing knob; 202-Connecting sleeve; 203-Fixing plate; 204-Positioning bolt. Detailed Implementation

[0045] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0046] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation—or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0049] like Figure 1-6 As shown, this embodiment of the utility model provides a concrete strain intelligent sensor, including two fixing mechanisms 2, which are used to connect to the main body mechanism 1. The main body mechanism 1, as the core structure of the sensor, undertakes the functions of strain acquisition and signal output; the fixing mechanisms 2 are used to fix the sensor on or inside the concrete surface.

[0050] Regarding the structure of main body 1, specifically:

[0051] The main body mechanism 1 includes an adjustment housing 101, with an adjustment knob 103 rotatably mounted on one end of the housing 101. A threaded rod 115 is fixedly mounted at the center of the adjustment knob 103, and one end of the threaded rod 115 is threadedly connected to a first end seat 104. Multiple vibrating wires 105 are fixedly mounted on one end of the first end seat 104. The number of vibrating wires 105 depends on the actual situation, for example, it can be set to eight. The eight vibrating wires 105 are arranged around the axis of the first end seat 104, and all eight vibrating wires 105 face the axis of the first end seat 104, thereby enabling the acquisition of strain information from different directions in all directions. A first fixing hole 102 is provided at the center of the upper surface of the first end seat 104 for connection with the fixing mechanism 2.

[0052] By setting up a linkage structure between the adjusting housing 101, the adjusting knob 103, and the threaded rod 115, the user can rotate the adjusting knob 103 to drive the threaded rod 115 to rotate, thereby driving the first end seat 104 to move axially along the threaded rod 115, thus adjusting the tension of the vibrating wire 105 connected to the first end seat 104. By adjusting the tension of the vibrating wire 105, the sensitivity and measurement accuracy of the sensor can be optimized.

[0053] The other ends of multiple vibrating wires 105 are fixedly connected to a second end seat 108, which provides support for the vibrating wires 105. Each vibrating wire 105 has a diaphragm 110 at its end passing through the second end seat 108. The diaphragm 110 is made of metal, and a fixed electrode plate 111 is fixedly disposed at one end of the diaphragm 110. An insulating medium is disposed between the diaphragm 110 and the fixed electrode plate 111. An electrode lead 112 is fixedly connected to one end of the fixed electrode plate 111, and one end of the electrode lead 112 is fixedly connected to a connector 119.

[0054] When the vibrating wire 105 is excited and vibrates, it drives the diaphragm 110 to vibrate synchronously, thereby changing the distance between the diaphragm 110 and the fixed electrode 111, causing a change in the capacitance between them. This change in capacitance is collected by the electrode lead 112 and transmitted to an external detection device through the connector 119, and is finally converted into a frequency signal, thereby realizing the measurement of strain.

[0055] A temperature sensor 117 is fixedly mounted at the middle position of one side surface of the second end seat 108. The temperature sensor 117 is connected to the connector 119 via a sensor lead 118. During the operation of the sensor, the temperature sensor 117 can collect the ambient temperature in real time and transmit the temperature signal to the detection device to perform temperature compensation on the measured strain signal and improve the accuracy of the measurement results.

[0056] A protective tube 107 is fixedly installed at one end of the adjusting housing 101. The protective tube 107 is made of stainless steel to enhance the overall mechanical strength of the device and prevent damage to the device due to external stress. An adjusting groove 116 is provided in the middle of the upper surface of the adjusting housing 101 to provide operating space for adjusting the position of the first end seat 104, ensuring that the fixing mechanism 2 can pass through the adjusting groove 116 and extend into the first fixing hole 102 when the first end seat 104 is in different positions.

[0057] An electromagnetic excitation coil 106 is installed inside the regulating housing 101. The electromagnetic excitation coil 106 is located in the middle of the protective tube 107 and is connected to an external excitation source via a wire. When the sensor is working, the external excitation source sends a pulse current signal to the electromagnetic excitation coil 106, generating an instantaneous magnetic field, which in turn excites the vibrating wire 105 to vibrate, thus completing the strain measurement.

[0058] A protective housing 113 is fixedly installed at one end of the second endplate 108 to protect critical circuits such as the electrode leads 112 and sensor leads 118. A waterproof ring 114 is provided in the middle of the inner surface of one side of the protective housing 113. The waterproof ring 114 is made of silicone material and wraps around the connection between the electrode leads 112, the sensor leads 118 and the connector 119, providing good waterproof performance and improving the stability and service life of the sensor in harsh environments.

[0059] A second fixing hole 109 is provided at the middle position of the upper surface of the second end seat 108 for connecting with the fixing mechanism 2.

[0060] Regarding the structure of the fixed mechanism 2, specifically:

[0061] The fixing mechanism 2 includes a connecting sleeve 202, a fixing plate 203 fixedly mounted at the bottom end of the connecting sleeve 202, and positioning bolts 204 at both ends of the fixing plate 203 for fixing the fixing mechanism 2 to the concrete surface. A fixing knob 201 is provided at the middle position of the upper end of the connecting sleeve 202 for connecting the fixing mechanism 2 to the main body mechanism 1.

[0062] In practical use, if the sensor needs to be embedded in the concrete, the user only needs to connect the main body 1 to the detection line through the connector 119 and then embed it in the corresponding position in the concrete.

[0063] To fix the sensor to the concrete surface, the user can insert the first end seat 104 and the second end seat 108 of the main body 1 into the connecting sleeves 202 of the two fixing mechanisms 2, and then tighten them into the first fixing hole 102 and the second fixing hole 109 respectively using the fixing knobs 201 to achieve a stable connection between the main body 1 and the fixing mechanism 2. Then, the fixing mechanism 2 is placed on the concrete surface through the fixing plate 203, and the device is fixed to the concrete surface using the positioning bolts 204. Finally, the connector 119 is connected to the detection equipment to start the measurement.

[0064] The working principle is as follows: When the device is in use and pre-embedded measurement is required, the user can connect the main body 1 to the detection circuit through the connector 119, and then pre-embed the main body 1 into the measurement location in the concrete. When fixed installation on the concrete surface is required, the user can insert the first end seat 104 and the second end seat 108 of the main body 1 into the connecting sleeves 202 of the two fixing mechanisms 2, and fix the main body 1 to the fixing mechanism 2 through the fixing knob 201. Then, the entire device is placed on the concrete to be tested position through the fixing plate 203, and the device is fixed to the concrete surface through the positioning bolts 204. During measurement, the external excitation source sends a pulse current signal to the electromagnetic excitation coil 106. The pulse signal generates an instantaneous magnetic field in the electromagnetic excitation coil 106. The instantaneous magnetic field acts on the vibrating string 105, causing the vibrating string 105 to vibrate. When the vibrating string 105 vibrates, it drives the diaphragm 110 to vibrate. The distance between the diaphragm 110 and the fixed electrode plate 111 is... The capacitance between the two changes due to the change. One end of the fixed electrode plate 111 is connected to the electrode lead 112. The electrode lead 112 transmits the capacitance change signal to the detection device through the connector 119. When the concrete is strained, the deformation is transmitted to the vibrating wire 105 through the first end seat 104 and the second end seat 108, which is converted into a change in the stress of the vibrating wire 105, thereby changing the vibration frequency of the vibrating wire 105. The detection device converts the electrical signal of the capacitance change caused by the vibrating wire 105 into a frequency signal. The strain value is calculated by measuring the frequency change. Eight vibrating wires 105 can collect the strain in eight different directions of the concrete. Based on the difference in strain between different vibrating wires 105, the location of the strain can be determined, improving the intelligence of the device. The temperature sensor 117 synchronously measures the ambient temperature and transmits the temperature signal to the detection device through the sensor lead 118. The detection device corrects the strain value for temperature based on the output signal of the temperature sensor 117, improving the accuracy of the measurement.

[0065] This utility model provides a smart concrete strain sensor with the following advantages:

[0066] This invention provides a smart concrete strain sensor. Compared to existing concrete strain sensors, this sensor uses eight vibrating wires 105, allowing users to measure strain in different directions. By comparing the differences in strain measured in different directions, the location of strain in the concrete can be determined, increasing the functionality, improving detection results, and enhancing the device's intelligence. The concrete strain measuring device is equipped with a fixing mechanism 2, allowing users to either embed the entire device into the concrete or fix it to the concrete surface. This simple and quick installation process makes the concrete strain sensor suitable for various application scenarios, expanding its overall applicability and practicality, and giving it wide applicability.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A concrete strain measuring device, characterized in that, include: Main body (1); The main body (1) includes a first end seat (104), a second end seat (108), a vibrating string (105), and a detection component; The vibrating string (105) is provided in multiple ways around the axis of the first end seat (104) and the second end seat (108); One end of each of the vibrating strings (105) is connected to the first end seat (104), and the other end of each of the vibrating strings (105) passes through the second end seat (108) and is connected to the detection member, and each of the vibrating strings (105) is connected to the second end seat (108); The first end seat (104) and the second end seat (108) are both used to transfer the concrete strain force to the vibrating string (105) so that the vibrating string (105) vibrates. The detection component is used to calculate the strain force value and strain force orientation based on the vibration frequency of the vibrating string (105).

2. The concrete strain measuring device according to claim 1, characterized in that, The detection component includes a diaphragm (110) and a fixed electrode plate (111). Each of the vibrating strings (105) is provided with a diaphragm (110) at one end away from the first end seat (104), and a fixed electrode plate (111) is fixedly provided on the side of each diaphragm (110) away from the vibrating string (105). The plurality of diaphragms (110) are all made of metal, and an insulating medium is provided between each diaphragm (110) and the corresponding fixed electrode plate (111).

3. The concrete strain measuring device according to claim 2, characterized in that, The detection component also includes electrode leads (112). Each of the fixed electrode plates (111) is correspondingly fixedly provided with an electrode lead (112), and one end of each of the multiple electrode leads (112) is fixedly connected with a connector (119).

4. The concrete strain measuring device according to claim 2, characterized in that, The main body (1) also includes an adjustment housing (101); One end of the adjusting housing (101) is rotatably provided with an adjusting knob (103), and the adjusting knob (103) is fixedly provided with a threaded rod (115), one end of which is threadedly connected to the first end seat (104).

5. The concrete strain measuring device according to claim 4, characterized in that, One end of the regulating housing (101) is fixedly provided with a protective tube (107), and an electromagnetic excitation coil (106) is fixedly provided inside the protective tube (107). The electromagnetic excitation coil (106) is connected to an external excitation source through a wire.

6. The concrete strain measuring device according to claim 4, characterized in that, The concrete strain measuring device also includes a fixing mechanism (2). The first end seat (104) is provided with a first fixing hole (102), and the second end seat (108) is provided with a second fixing hole (109). The first fixing hole (102) and the second fixing hole (109) are both connected to the fixing mechanism (2), which is used to fix it in concrete.

7. The concrete strain measuring device according to claim 6, characterized in that, The fixing mechanism (2) includes a connecting sleeve (202), and a fixing plate (203) is fixedly provided at the bottom end of the connecting sleeve (202); The fixing plate (203) has positioning bolts (204) threaded at both ends, and the connecting sleeve (202) has a fixing knob (201) threaded at the top end. The fixing knob (201) is used to extend into the first fixing hole (102) or the second fixing hole (109).

8. The concrete strain measuring device according to claim 7, characterized in that, The adjusting housing (101) is provided with an adjusting groove (116), and the fixing knob (201) can extend through the adjusting groove (116) into the first fixing hole (102).

9. The concrete strain measuring device according to claim 3, characterized in that, A temperature sensor (117) is fixedly disposed on one side surface of the second end seat (108). One end of the temperature sensor (117) is fixedly connected to a sensor lead (118), and one end of the sensor lead (118) is connected to the connector (119).

10. The concrete strain measuring device according to claim 9, characterized in that, A protective shell (113) is fixedly provided at one end of the second end seat (108). A waterproof ring (114) is fixedly provided at the middle position of the inner surface of one side of the protective shell (113). The protective shell (113) is used to cover the diaphragm (110), the fixed electrode plate (111), the electrode lead (112) and the sensor lead (118). A waterproof ring (114) is provided on the end face of the protective shell (113) near the connector (119).

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