Pipeline segment stress-strain monitoring device

Abstract

The utility model discloses a pipeline segment stress-strain monitoring device, and mainly relates to the field of subway engineering monitoring. Comprising a shell, and an electric control module, a locking piece and a data terminal which are arranged in the shell, a through hole is formed in the bottom of the shell, the through hole is matched with a pipe piece bolt, and a pipe piece nut is located in the shell; a limiting column is arranged in the shell, the locking piece is provided with a limiting protrusion matched with the limiting column, and the limiting piece limits rotation of the segment nut. The subway segment stress monitoring device has the advantages that the subway segment stress monitoring device is used for monitoring subway segment stress, the Zigbee wireless transmission technology is adopted, the wiring workload is greatly reduced, the installation cost and the maintenance difficulty are reduced, and meanwhile the reliability and the anti-interference capacity of a system are improved. Zigbee transmission has the characteristics of low power consumption, ad hoc network and high stability, data loss and transmission delay can be effectively avoided, and the reliability of data transmission is improved.

Description

Technical Field

[0001] The utility model relates to the field of subway engineering monitoring, in particular to a pipeline segment stress and strain monitoring device. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The lining structure of a shield tunnel is composed of segments and joints, with the segment structure being a crucial component of the shield tunnel. Because shield tunnel joints have weaker bending resistance than shield segments, they become weak points in the tunnel lining, and their mechanical behavior significantly affects the mechanical properties of the entire ring. Joints, which include components such as joints, bolts, and bolt holes, have relatively complex detailed structures, and currently, no unified formula exists for calculating their mechanical properties. Therefore, studying the stress and deformation of shield tunnel joints is key to understanding the overall stress and deformation of shield tunnel linings.

[0004] Each section of the subway pipeline is composed of 6 segments, and adjacent sections are connected by curved segment bolts. For the segments of the subway pipeline, when the stress changes, it will first be transmitted to the segment bolts, so the force on the segment bolts can be monitored, thereby reflecting the stress and strain of the segments.

[0005] When stress changes occur in the subway segments, the stress will be directly transmitted to the nuts of the segment bolts. Therefore, it is necessary to monitor the pre-tightening force between the nuts and the segment bolts, and then monitor the stress changes of the subway segments. Since the subway will vibrate during operation, this process will affect the tightness of the nuts on the subway segments, so the above problem needs to be solved. Utility Model Content

[0006] The purpose of the present utility model is to provide a pipeline segment stress and strain monitoring device, which is used to monitor the stress of subway segments. It adopts Zigbee wireless transmission technology, which greatly reduces the wiring workload, reduces the installation cost and maintenance difficulty, and improves the reliability and anti-interference ability of the system. Zigbee transmission has the characteristics of low power consumption, self-organizing network, and high stability. It can effectively avoid data loss and transmission delay, and improve the reliability of data transmission. Combined with the vibration power generation module, it realizes self-powered or auxiliary power supply of the device, extends the working time of the device, reduces dependence on external power supply, and improves the continuity and stability of monitoring. The entire device has a compact structure, is easy to install and maintain, and can adapt to the complex working environment of the subway. Efficient real-time monitoring can timely obtain the stress and strain data of the subway segment, point out the specific location of the strain gauge where the problem occurs, timely discover safety hazards, and improve the safety of subway operation.

[0007] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0008] A pipeline segment stress and strain monitoring device includes a shell, an electronic control module arranged inside the shell, a locking piece, and a data terminal; a through hole is provided at the bottom of the shell, the through hole cooperates with the segment bolt, and the segment nut is located inside the shell; a limit column is provided inside the shell, and the locking piece is provided with a limit protrusion adapted to the limit column, and the limit piece limits the rotation of the segment nut; the electronic control module includes a strain gauge, an acquisition module, a vibration power generation module and a data transmission module arranged in the shell, the strain gauge is used to detect the stress of the segment nut and convert it into an electrical signal, and the data transmission module transmits the converted electrical signal to the data terminal.

[0009] The shell is equipped with a cover plate, the cover plate is plugged into the limiting column, the locking piece is provided with a limiting sleeve, and the limiting sleeve is adapted to the tube nut.

[0010] The acquisition module includes a signal amplifying circuit, a processing chip and a radio frequency module. The signal amplifying circuit is connected to the strain gauge, and the processing chip is connected to the output end of the amplifying circuit.

[0011] The vibration power generation module includes piezoelectric ceramics, a rectifier bridge and a power management module.

[0012] The data terminal includes a radio frequency receiving module, a host computer, and a coordinator.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This device is used to monitor the stress of subway pipe segments. It utilizes Zigbee wireless transmission technology, which significantly reduces wiring workload, installation costs, and maintenance difficulty, while also improving system reliability and anti-interference capabilities. Zigbee transmission features low power consumption, self-organizing networking, and high stability, effectively preventing data loss and transmission delays, thereby improving data transmission reliability. Combined with a vibration power generation module, the device can be self-powered or auxiliary-powered, extending its operating time, reducing reliance on external power sources, and improving the continuity and stability of monitoring. The entire device is compact, easy to install and maintain, and adaptable to the complex working environment of the subway. Efficient real-time monitoring can promptly obtain stress and strain data on subway pipe segments, pinpointing the specific location of strain gauges with problems, promptly identifying potential safety hazards, and improving the safety of subway operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attachment Figure 1 This is a connection state diagram of the utility model.

[0016] Attachment Figure 2 It is a cross-sectional view of the device in the present utility model.

[0017] Attachment Figure 3 This is the principle diagram of the electronic control part of the utility model.

[0018] Attachment Figure 4 This is the circuit diagram of the electronic control part of the utility model.

[0019] Reference numerals shown in the accompanying drawings:

[0020] 1. Shell; 2. Segment bolts; 3. Segment nuts; 4. Limiting columns; 5. Cover plate; 6. Limiting sleeves; 7. Limiting protrusions. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that these equivalent forms also fall within the scope defined in this application.

[0022] The utility model is a pipeline segment stress and strain monitoring device, the main structure of which includes a shell 1, an electric control module arranged inside the shell 1, a locking member, and a data terminal;

[0023] Since this application is mainly to monitor the stress of the segment nut 3 and then feedback the changes in the subway segment stress, in order to eliminate the influence of the vibration of the segment nut 3 during the operation of the subway, which causes it to loosen and affect the accuracy of the measurement results, this application is mainly divided into two parts: structure and data control module. First, the relaxation structure part is described:

[0024] As shown in the attached figure of the instruction manual Figure 2 As shown, a through hole is provided at the bottom of the shell 1, which cooperates with the tube segment bolt 2, and the tube segment nut 3 is located in the shell 1. The strain gauge of the electronic control part is set below the position of the tube segment nut 3 to detect the stress between the tube segment nut 3 and the tube segment bolt 2. In order to prevent the tube segment nut 3 from loosening, the corresponding settings are: a limiting column 4 is provided inside the shell 1, and the locking piece is provided with a limiting protrusion 7 adapted to the limiting column 4. The locking piece is provided with a limiting sleeve 6, and the limiting sleeve 6 is adapted to the outer contour of the tube segment nut 3. The locking piece is sleeved with the limiting column 4 through the limiting protrusion 7, so that the locking piece cannot rotate, thereby limiting the rotation of the tube segment nut 3 through the limiting sleeve 6 of the locking piece, thereby preventing the tube segment nut 3 from loosening and playing a good anti-loosening role. In order to prevent the locking piece from falling off the limiting column 4, the shell 1 is equipped with a cover plate 5, which is plugged into the limiting column 4 and has an interference fit, and the bottom surface of the cover plate 5 acts on the limiting protrusion 7, thereby limiting the displacement along the direction of the limiting column 4 and preventing the locking piece from falling off the limiting column 4.

[0025] As for the installation position of this device, it is installed on the nuts at both ends of the subway segment bolt 2, and is located at the connection between the two subway segments, so the number installed on each segment is two. Each section of the subway pipeline is composed of 6 segments, so there are two Zigbee nodes on each segment, and they are located at both ends of the segment. This can enable more timely, comprehensive and better monitoring of changes in subway segment stress.

[0026] As shown in the attached figure of the instruction manual Figure 3 and Figure 4 As shown, the electronic control module includes a strain gauge, an acquisition module, a vibration power generation module, and a data transmission module, housed within the housing 1. The strain gauge is used to detect stress in the sheet nut 3 and convert it into an electrical signal. The operating principle of the resistance strain gauge is based on the strain effect: when a conductor or semiconductor material undergoes mechanical deformation under the action of an external force, its resistance changes accordingly. This phenomenon is called the "strain effect," and thus, the strain gauge can be used to monitor changes in stress between the sheet nut 3 and the sheet bolt 2. The strain gauge detects stress and strain and converts them into electrical signals. A Wheatstone bridge connection is used to improve detection sensitivity and stability. If any of the strain gauge data is abnormal, an alarm is generated, and the data is fed back to the host computer for processing.

[0027] The acquisition module consists of a signal amplification circuit, a CC2530 chip, and a radio frequency module. The signal amplification circuit is connected to the strain gauge to amplify the voltage signal. The ADC on the CC2530 chip is connected to the output of the amplification circuit to collect the amplified signal. The radio frequency module is connected to the CC2530 chip to wirelessly transmit the collected data to the host computer.

[0028] The data transmission module transmits the converted electrical signal to the data terminal, which includes a radio frequency receiving module, a host computer, and a coordinator. It includes the receiving part of the coordinator CC2530 radio frequency module, the processing part of CC2530, and the communication interface with the host computer. The radio frequency receiving module receives data from all Zigbee nodes, which is processed by the coordinator CC2530 and uploaded to the host computer through the communication interface. The voltage signal generated by the change in strain gauge resistance is amplified by the signal conditioning circuit and then collected by the ADC of the Zigbee node. The data is uploaded to the host computer through the coordinator Zigbee for display and analysis. When the detection value of a strain gauge among the six pipe segments of a certain section of the pipeline is abnormal, an alarm signal is sent through the host computer, indicating the specific location of the strain gauge with the problem.

[0029] The vibration power generation module comprises piezoelectric ceramics, a rectifier bridge, and an LTC5883-1 power management module. The module utilizes the vibrations of the subway to generate a voltage in the piezoelectric ceramics. This voltage is rectified by the rectifier bridge and then stored in the LTC5883-1 power management module to charge the battery, providing additional power for the low-power detection device and improving its battery life.

[0030] In summary, this device, used to monitor subway segment stress, utilizes Zigbee wireless transmission technology, significantly reducing wiring workload, installation costs, and maintenance difficulties, while also improving system reliability and anti-interference capabilities. Zigbee transmission features low power consumption, self-organizing networking, and high stability, effectively preventing data loss and transmission delays, thereby enhancing data transmission reliability. Combined with a vibration power generation module, the device can be self-powered or auxiliary powered, extending its operating time, reducing reliance on external power sources, and improving the continuity and stability of monitoring. The entire device is compact, easy to install and maintain, and adaptable to the complex operating environment of the subway. Efficient, real-time monitoring enables timely acquisition of subway segment stress and strain data, pinpointing the specific location of strain gauges with problems, promptly identifying potential safety hazards, and improving subway operation safety.

Claims

1. A pipeline segment stress and strain monitoring device, characterized by: It comprises a housing (1), an electric control module, a locking member, and a data terminal arranged inside the housing (1); The bottom of the shell (1) is provided with a through hole, the through hole cooperates with the tube segment bolt (2), and the tube segment nut (3) is located inside the shell (1); A limiting column (4) is provided inside the housing (1), and the locking member is provided with a limiting protrusion (7) adapted to the limiting column (4), and the limiting member limits the rotation of the segment nut (3); The electric control module comprises a strain gauge, an acquisition module, a vibration power generation module and a data transmission module arranged in a housing (1); the strain gauge is used to detect the stress of the tube nut (3) and convert it into an electrical signal; and the data transmission module transmits the converted electrical signal to a data terminal.

2. The pipeline segment stress and strain monitoring device according to claim 1, characterized in that: The housing (1) is provided with a cover plate (5), the cover plate (5) is plugged into the limiting column (4), the locking member is provided with a limiting sleeve (6), and the limiting sleeve (6) is adapted to the tube nut (3).

3. The pipeline segment stress and strain monitoring device according to claim 2, characterized in that: The acquisition module includes a signal amplifying circuit, a processing chip and a radio frequency module. The signal amplifying circuit is connected to the strain gauge, and the processing chip is connected to the output end of the amplifying circuit.

4. The pipeline segment stress and strain monitoring device according to claim 3, characterized in that: The vibration power generation module includes piezoelectric ceramics, a rectifier bridge and a power management module.

5. The pipeline segment stress and strain monitoring device according to claim 4, characterized in that: The data terminal includes a radio frequency receiving module, a host computer, and a coordinator.

Images