Electromagnetic elastic cable force sensor

Abstract

The utility model discloses an electromagnetic elastic cable force sensor, and relates to the technical field of monitoring of internal bundle prestress in a prestressed concrete structure. The electromagnetic elastic cable force sensor body is arranged on the preset pipeline in a sleeving manner and is located in the middle of the preset pipeline; each connecting assembly comprises a protective shell, a first connector and a second connector, the first connector and the second connector are fixedly arranged in the protective shell, the first connector is used for being connected with the end of a preset pipeline, and the second connector is used for being connected with the end of a prestressed pipeline in a to-be-tested concrete structure; the first connector and the second connector are in sealed connection with the inner wall of the protective shell. The electromagnetic elastic cable force sensor is convenient to use, does not need to be calibrated repeatedly, reduces the workload, saves the calibration period, and can prevent the detection signal of the electromagnetic elastic cable force sensor body from being influenced because the preset pipeline is made of the non-metal non-magnetic material, thereby improving the detection accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of in - body tendon prestress monitoring in prestressed concrete structures, and particularly to an electromagnetic - elastic cable force sensor. Background Technique

[0002] At present, the working principle of the electromagnetic - elastic cable force sensor based on the magneto - elastic effect is to use an external magnetic field to magnetize the measured component technically, and to characterize the external force applied to the measured component by measuring the magnetic characteristic value of the measured component, so as to realize the load detection of relevant ferromagnetic components in civil engineering structures. In the application scenario of in - body prestressed tendon load monitoring in prestressed concrete structures, ordinary electromagnetic - elastic cable force sensors are generally installed outside the prestressed duct in a sleeved form to realize the prestress monitoring of the whole - hole in - body tendon.

[0003] However, before the electromagnetic - elastic cable force sensor is put into actual application, load and temperature calibration experiments need to be carried out. When there are prestressed ducts of various materials (plastic or metal) in the actual concrete structure, the calibration work of the electromagnetic - elastic cable force sensor needs to be completed successively for different prestressed ducts. This will not only increase the cost of experimental work, but also some materials, such as metal materials, will affect the signal of the electromagnetic - elastic cable force sensor, affecting the detection accuracy and being not conducive to the accurate monitoring of in - body prestress. Content of the Utility Model

[0004] The purpose of the utility model is to provide an electromagnetic - elastic cable force sensor to solve the problems existing in the above - mentioned prior art, reduce the calibration workload, avoid the influence of the prestressed duct in the concrete structure to be measured on the signal of the electromagnetic - elastic cable force sensor, and thus improve the detection accuracy of the electromagnetic - elastic cable force sensor.

[0005] To achieve the above - mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides an electromagnetic - elastic cable force sensor, including:

[0007] A preset duct;

[0008] An electromagnetic - elastic cable force sensor body, the electromagnetic - elastic cable force sensor body is sleeved on the preset duct and is located in the middle of the preset duct;

[0009] At least two connecting components, the connecting component includes a protective shell and a first joint and a second joint respectively fixedly arranged in the protective shell. The first joint is used to connect with the end of the preset duct, the second joint is used to connect with the end of the prestressed duct in the concrete structure to be measured, and the first joint and the second joint are respectively hermetically connected to the inner wall of the protective shell.

[0010] Preferably, the length of the preset pipeline is three times the length of the electromagnetic elastic cable force sensor body.

[0011] Preferably, the material of the preset pipeline is a non-metallic and non-magnetic conductive material.

[0012] Preferably, the material of the preset pipeline is high-density polyethylene.

[0013] Preferably, the preset pipeline is a corrugated pipe or a cylinder.

[0014] Preferably, the first joint and the second joint are respectively bonded to the protective housing through high-performance epoxy glue.

[0015] Preferably, the protective housing is cylindrical, and the protective housing, the first joint and the second joint are coaxial.

[0016] Preferably, there is a gap between the first joint and the second joint.

[0017] Preferably, the material of the protective housing is stainless steel.

[0018] Preferably, the connection assembly is divided into at least two types according to the types of the second joints.

[0019] The utility model has achieved the following technical effects compared with the prior art:

[0020] Since the electromagnetic elastic cable force sensor of the utility model is provided with a preset pipeline, when in use, the preset pipeline is connected to the prestressed pipeline in the concrete structure to be measured, and the electromagnetic elastic cable force sensor body is sleeved on the preset pipeline, so only one calibration is required, instead of calibrating the prestressed pipelines at different use sites respectively. It is convenient to use, does not need to be calibrated repeatedly, reduces the workload and saves the calibration period. At the same time, since the preset pipeline adopts a non-metallic and non-magnetic conductive material, it can avoid the detection signal of the electromagnetic elastic cable force sensor body from being affected, thereby improving the detection accuracy.

[0021] Furthermore, the second joint in the connection assembly can be adaptively selected according to the type of the prestressed pipeline in the concrete structure to be measured. Especially when the prestressed pipeline in the concrete structure to be measured is a metal pipeline, it avoids the influence of the metal pipeline on the detection accuracy of the electromagnetic elastic cable force sensor, and improves the applicability of the electromagnetic elastic cable force sensor in the prestress monitoring of the concrete structure body. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of the electromagnetic elastic cable force sensor of the present invention;

[0024] Figure 2 Cross-sectional view of the electromagnetic elastic cable force sensor of the present invention;

[0025] Figure 3 Structural schematic diagram of the connection component in the electromagnetic elastic cable force sensor of the present invention;

[0026] In the figure: 1, electromagnetic elastic cable force sensor body; 2, preset pipeline; 3, connection component; 4, protective housing; 5, first joint; 6, second joint. Specific embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide an electromagnetic elastic cable force sensor to solve the problems existing in the above-mentioned prior art, reduce the calibration workload, avoid the influence of the prestressed pipeline in the concrete structure to be measured on the signal of the electromagnetic elastic cable force sensor, and thus improve the detection accuracy of the electromagnetic elastic cable force sensor.

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0030] As Figures 1 to 3 shown, this embodiment provides an electromagnetic elastic cable force sensor, including:

[0031] Preset pipeline 2;

[0032] The electromagnetic elastic cable force sensor body 1 is sleeved on the preset pipeline 2 and is located in the middle of the preset pipeline 2;

[0033] At least two connecting components 3, the connecting component 3 includes a protective housing 4 and a first joint 5 and a second joint 6 fixedly arranged in the protective housing 4 respectively. The first joint 5 is used for connecting with the end of the preset pipeline 2, and the second joint 6 is used for connecting with the end of the prestressed pipeline in the concrete structure to be measured. The first joint 5 and the second joint 6 are respectively hermetically connected to the inner wall of the protective housing 4.

[0034] It should be noted that the electromagnetic elastic cable force sensor body 1 adopts a commercially available product well-known in the art. For example, the magnetoelectric sensing element in the invention patent with the patent application number 201110389375.8 can be used as the electromagnetic elastic cable force sensor body 1 in this implementation.

[0035] In addition, the reason why the number of the connecting components 3 is at least two is that one connecting component 3 needs to be connected to each end of the preset pipeline 2. Considering the different types of prestressed pipelines in the concrete structure to be measured, different second joints 6 need to be set. For example, the prestressed pipelines in the concrete structure to be measured usually have two types: metal corrugated pipes and plastic corrugated pipes. Different second joints 6 need to be set for metal corrugated pipes and plastic corrugated pipes. This results in at least two types of connecting components 3 according to the different types of the second joints 6. The specific number of the types of the second joints 6 needs to be determined by technicians according to the actual use situation.

[0036] In an alternative embodiment of the present embodiment, preferably, the length of the preset pipeline 2 is 3 times the length of the electromagnetic elastic cable force sensor body 1, which provides sufficient space for the installation of the sensor. At the same time, the longer preset pipeline 2 can make the magnetic field around the electromagnetic elastic cable force sensor body 1 more uniform. This helps to improve the measurement accuracy of the magnetic characteristic values of the measured component by the sensor and reduce the measurement error. At the same time, the uniform magnetic field distribution can also improve the stability and repeatability of the sensor, making the measurement results more reliable. The wall thickness of the wall of the preset pipeline 2 is not less than 2.5 mm, which increases the strength and rigidity of the preset pipeline 2. This enables the preset pipeline 2 to withstand a certain amount of external pressure and tension, preventing deformation or rupture during installation and use. Especially when connecting with the connecting component 3 and the prestressed pipeline, sufficient wall thickness can ensure the firmness and tightness of the connection and improve the safety of the entire system.

[0037] In this embodiment, the material of the preset pipeline 2 is a non-metallic and non-magnetic conductive material; preferably, the material of the preset pipeline 2 is high-density polyethylene.

[0038] In an alternative embodiment of the present embodiment, preferably, the preset pipeline 2 is a corrugated pipe or a cylinder.

[0039] In an alternative embodiment of the present embodiment, preferably, the first connector 5 and the second connector 6 are respectively bonded to the protective housing 4 by a high-performance epoxy adhesive to ensure the sealing performance and pressure resistance between the first connector 5 and the second connector 6 and the protective housing 4.

[0040] In an alternative embodiment of the present embodiment, preferably, the protective housing 4 is cylindrical, and the protective housing 4, the first connector 5, and the second connector 6 are coaxial; the cylindrical protective housing 4 has a uniform stress distribution and can better withstand external forces from all directions. In practical applications, the connection assembly 3 may be subjected to various forces such as tension, compression, and bending. The cylindrical structure can evenly disperse these forces to the entire housing, reducing local stress concentration and thus improving the overall structural stability of the connection assembly 3. The coaxial design makes the central axes of the first connector 5 and the second connector 6 coincide with that of the protective housing 4. In this way, when connecting pipelines, it can ensure that the force transmission is more direct and uniform. It avoids eccentric stress caused by non-coaxiality, reducing the risk of deformation of the connectors and the protective housing 4. Especially under the condition of bearing large pressure or tension, the coaxial structure can maintain the firmness of the connection, preventing leakage and loosening.

[0041] In an alternative embodiment of the present embodiment, preferably, there is a gap between the first connector 5 and the second connector 6; this design with a gap provides a certain independent space for the first connector 5 and the second connector 6 during the installation process, making it more convenient to perform the connection operation and improving the installation efficiency and accuracy. At the same time, the gap also provides a certain buffer space for the connected pipeline, reducing the risk of damage to the connectors caused by pipeline deformation or displacement during the installation process.

[0042] In an alternative embodiment of the present embodiment, preferably, the material of the protective housing 4 is stainless steel; stainless steel has high strength and hardness, which can provide good protection for the internal first connector 5 and second connector 6. In actual use, the connection assembly 3 may be subjected to certain external forces, such as pulling and squeezing during the installation process. The stainless steel protective housing 4 can effectively resist these external forces, preventing damage to the internal connectors and ensuring the stability and reliability of the connection; the sealing between the protective housing 4 and the first connector 5 and the second connector 6 is crucial for the normal operation of the entire electromagnetic elastic cable force sensor. The stainless steel material can be processed into a high-precision shape and can achieve good fitting with the connectors, thereby improving the sealing performance. Through the bonding of the high-performance epoxy adhesive, the sealing effect is further enhanced, preventing the leakage of the medium in the pipeline and ensuring the accuracy of the measurement.

[0043] In this utility model, specific examples are used to elaborate on the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and its core idea of the utility model; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation on the utility model.

Claims

1. An electromagnetic elastic cable force sensor, characterized in that Comprising: A preset pipeline; An electromagnetic elastic cable force sensor body, which is sleeved on the preset pipeline and is located in the middle of the preset pipeline; At least two connecting components, each connecting component includes a protective shell and a first joint and a second joint fixedly arranged in the protective shell respectively. The first joint is used to connect with the end of the preset pipeline, the second joint is used to connect with the end of the prestressed pipeline in the concrete structure to be measured, and the first joint and the second joint are respectively hermetically connected to the inner wall of the protective shell.

2. The electromagnetic elastic cable force sensor according to claim 1, characterized in that: The length of the preset pipeline is 3 times the length of the electromagnetic elastic cable force sensor body.

3. The electromagnetic elastic cable force sensor according to claim 1, characterized in that: The material of the preset pipeline is a non-metallic and non-magnetic material.

4. The electromagnetic elastic cable force sensor according to claim 3, wherein: The material of the preset pipeline is high-density polyethylene.

5. The electromagnetic elastic cable force sensor according to claim 1, characterized in that: The preset pipeline is a corrugated pipe or a cylinder.

6. The electromagnetic elastic cable force sensor according to claim 1, wherein: The first joint and the second joint are respectively bonded to the protective shell by high-performance epoxy glue.

7. The electromagnetic elastic cable force sensor according to claim 1, wherein: The protective shell is cylindrical, and the protective shell, the first joint and the second joint are coaxial.

8. The electromagnetic elastic cable force sensor according to claim 1, characterized in that: There is a gap between the first joint and the second joint.

9. The electromagnetic elastic cable force sensor according to claim 1, characterized in that: The material of the protective shell is stainless steel.

10. The electromagnetic elastic cable force sensor according to claim 1, characterized in that: The connecting components are divided into at least two types according to the different types of the second joint.

Images