A warm pressure detection and frozen system state judging device

Abstract

The utility model discloses a kind of temperature and pressure detection and frozen system state judging device, it is related to shield construction technology field, applicable to water-rich stratum shield freezing method, including shield machine inner wall and monitor, the monitor is installed on shield machine inner wall, the monitor includes pedestal, stepping motor is fixedly installed in the left side in the pedestal, and connection plate is connected, the connection plate is slidably installed in the pedestal, plated mirror and temperature measuring well are fixedly installed on the connection plate, signal receiving processor and programmable logic controller are arranged below the temperature measuring well, can timely feedback frozen state information, judge whether frozen wall thickness and strength reach construction requirement and effectively control freezing process in time, which greatly improves the safety and reliability of construction, and in water-rich fine sand and water-rich composite stratum, it has good use prospect for the judgment of frozen state and shield repair.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine (TBM) construction technology, and in particular to a temperature and pressure detection and freezing system status judgment device. Background Technology

[0002] Due to the high risks associated with tunnel construction in water-rich sandy layers and other soft, water-rich strata, freezing methods are often used to improve tunnel construction safety. This involves creating an artificial negative temperature zone using refrigeration machinery, freezing the moisture in the strata to form a high-strength frozen body capable of withstanding significant ground pressure, greatly improving ground stability, and creating conditions for safe, waterless operations under the protection of a frozen wall. However, current methods for determining the freezing state of the soil still rely on manually selecting temperature measurement points, freezing holes, and frost heave monitoring points. The thickness and average temperature of the frozen wall are then predicted based on the frozen soil expansion rate and the degree of frost wall overlap calculated from the temperature measurements taken at the frozen wall. This method, due to the heavy manual workload, cannot quickly and accurately reflect the freezing state, is prone to errors, and struggles to detect anomalies.

[0003] In actual tunnel construction in water-rich composite strata, freezing reinforcement is a dynamic and lengthy process. These composite strata environments are highly variable, sometimes containing sand, silt, or even corrosive liquids. This complex environment has a significant impact on the actual freezing effect. Relying solely on existing methods for prediction is unlikely to be accurate enough, which may lead to significant differences between the actual thickness and strength of the frozen wall and expectations. In severe cases, it may cause problems such as tunnel face collapse and instability, thereby affecting the tunnel's waterproof performance and structural stability, and endangering the lives of workers inside the tunnel.

[0004] Currently, without a smart, visual device that can measure temperature and pressure in real time to calculate the thickness and strength of frozen walls and provide early warnings, it is difficult to accurately reflect the state of frozen walls. Therefore, developing such a device that integrates temperature and pressure monitoring and non-destructive testing of frozen walls is of great significance for improving methods for judging frozen walls, increasing the accuracy of frozen wall thickness and strength estimations and construction safety, reducing human error, and thus promoting the further development of freezing reinforcement technology for water-rich strata. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model discloses a temperature and pressure detection and freezing system status judgment device, applicable to the shield tunneling freezing method in water-rich strata. It includes the inner wall of the shield machine and a monitor. The monitor is installed on the inner wall of the shield machine and includes a base. A stepper motor is fixedly installed on the left side of the base. The output end of the stepper motor is connected to a lead screw, which is threadedly connected to a connecting plate. The connecting plate is slidably installed within the base. A coated reflector and a temperature measuring well are fixedly installed on the connecting plate. A calibration blackbody is fixedly installed inside the temperature measuring well. A signal receiving processor and a programmable logic controller (PLC) are located below the temperature measuring well. A central processing unit (CPU) is located below the signal receiving processor and the PLC. A radiation thermometer is installed on the right side of the base. An earth pressure cell is located below the radiation thermometer, and a buzzer alarm is located on the right side of the earth pressure cell.

[0006] Furthermore, the inner wall of the base is equipped with an electric heat tracing insulation layer, which protects multiple electronic components inside the base to operate stably at low temperatures.

[0007] Furthermore, the side wall of the base is provided with a notch, and a temperature measuring window is provided at the notch.

[0008] Furthermore, the signal receiving processor is used to receive the data recorded by the radiation thermometer and upload it to the programmable logic controller, which performs real-time logic control.

[0009] Furthermore, the central processing unit is used to run monitoring software and computing models, and a communication unit is provided on one side of the central processing unit, which is electrically connected to the programmable logic controller and the central processing unit.

[0010] The advantages of this invention compared to the prior art are: this invention can provide timely feedback on freezing status information, determine whether the thickness and strength of the frozen wall meet the construction requirements, and effectively control the freezing process in a timely manner. This greatly improves the safety and reliability of construction, and has good application prospects in judging the freezing status and repairing tunnel boring machines in water-rich fine sand and water-rich composite strata. Attached Figure Description

[0011] Figure 1 This is a diagram showing the installation location of this utility model.

[0012] Figure 2 This is a diagram showing the installation position of this utility model from another angle.

[0013] Figure 3 This is a schematic diagram of the overall structure of this utility model.

[0014] Reference numerals: 1-Coated reflector; 2-Stepper motor; 3-Calibration blackbody; 4-Temperature measuring well; 5-Signal receiver processor; 6-Programmable logic controller; 7-Central processing unit; 8-Communication unit; 9-Buzzer alarm; 10-Electric heat tracing insulation layer; 11-Temperature measuring window; 12-Radiation thermometer; 13-Earth pressure cell; 14-Inner wall of tunnel boring machine. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0017] 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 based on the specific circumstances.

[0018] Example: Figures 1-3As shown, a temperature and pressure detection and freezing system status judgment device is applicable to the shield tunneling freezing method in water-rich strata. It includes an inner wall 14 of the shield machine and a monitor. The monitor is installed on the inner wall 14 of the shield machine and includes a base. A stepper motor 2 is fixedly installed on the left side of the base. The output end of the stepper motor 2 is connected to a lead screw, which is threadedly connected to a connecting plate. The connecting plate is slidably installed within the base. A temperature measuring well 4 and a coated reflector 1 for focusing the infrared radiation of the target object are fixedly installed on the connecting plate. A standard reference for improving temperature measurement accuracy is fixedly installed inside the temperature measuring well 4. The calibration blackbody 3 and the temperature measuring well 4 provide a stable working space for the calibration blackbody 3. A signal receiving processor 5 and a programmable logic controller 6 are installed below the temperature measuring well 4. A central processing unit 7 is installed below the signal receiving processor 5 and the programmable logic controller 6. A radiation thermometer 12 for receiving infrared radiation emitted by the object itself is installed on the right side of the base. A soil pressure box 13 for measuring soil pressure is installed below the radiation thermometer 12. A buzzer alarm 9 for alarming the engineer when the soil pressure box 13 exceeds the threshold is installed on the right side of the soil pressure box 13.

[0019] The inner wall of the base is equipped with an electric heat tracing insulation layer 10, which protects multiple electronic components inside the base to operate stably at low temperatures.

[0020] The side wall of the base is provided with a notch, and a temperature measuring window 11 is provided at the notch to transmit infrared radiation from the target and protect the optical system inside the base.

[0021] The signal receiving processor 5 is used to receive the data recorded by the radiation thermometer 12 and upload it to the programmable logic controller 6. The programmable logic controller 6 performs real-time logic control. When the frost heave pressure reaches the set value, the programmable logic controller 6 controls the air pressure valve to release the pressure.

[0022] The central processing unit 7 is used to run monitoring software and calculation models. A communication unit 8 is provided on one side of the central processing unit 7. The communication unit 8 is electrically connected to the programmable logic controller 6 and the central processing unit 7. The communication unit 8 facilitates engineers to upload, download and monitor data changes in real time.

[0023] During use, a monitor is installed on the inner wall 14 of the tunnel boring machine. Then, the monitor is activated, and the radiation thermometer 12 and the earth pressure cell 13 start working, transmitting the collected temperature and pressure data to the programmable logic controller 6 and the central processing unit 7. The central processing unit 7 processes the data and uses the spatial discrete temperature data from the temperature measurement area to generate a three-dimensional temperature field cloud map of the entire temperature measurement space; for the pressure data, a real-time dynamic curve is established, and a threshold is set. The programmable logic controller 6 and the central processing unit 7 calculate the thickness of the frozen wall, the average temperature, and the cross-sectional strength based on the pre-input formulas and experimental data, and use the calculated data to reflect changes in the freezing state. The formula used to estimate the average temperature is used to determine the strength and stability of the frozen wall.

[0024] The Vyarov-Zaretsky formula: used to estimate the average temperature of a frozen wall. .

[0025]

[0026] Average temperature of the frozen wall

[0027] Temperature of the freezer surface t: Design thickness of the frozen wall (m) E: Spacing between freezers (m) Formulas for predicting temperature field distribution – determining thickness An infinitely long linear heat source model is selected (the freezer can be simplified as a linear heat source).

[0028] At a distance r (m) from the center of the freezing tube, after freezing time The temperature afterwards (°C) q: Heat absorption rate per unit length of the freezer (W / m) Thermal conductivity of soil (W / (m·°C)) a: Thermal conductivity of soil (m² / s) Ei: Exponential integral function Initial ground temperature (°C) of the soil When the frost heave pressure reaches the set value, the programmable logic controller 6 controls the valve to release pressure, achieving normal pressure working conditions inside the tunnel boring machine cabin. If the frozen wall thickness or average cross-sectional strength data is abnormal or below the safe value, the staff will be reminded by the buzzer alarm 9 and a warning will be issued through the software interface in the central processing unit 7.

[0029] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A temperature and pressure detection and freezing system status judgment device, applicable to shield tunneling freezing method in water-rich strata, characterized in that: The device includes an inner wall (14) of the tunnel boring machine and a monitor. The monitor is installed on the inner wall (14) of the tunnel boring machine. The monitor includes a base. A stepper motor (2) is fixedly installed on the left side of the base. The output end of the stepper motor (2) is connected to a lead screw. The lead screw is threadedly connected to a connecting plate. The connecting plate is slidably installed in the base. A coated reflector (1) and a temperature measuring well (4) are fixedly installed on the connecting plate. A calibration blackbody (3) is fixedly installed in the temperature measuring well (4). A signal receiving processor (5) and a programmable logic controller (6) are arranged below the temperature measuring well (4). A central processing unit (7) is arranged below the signal receiving processor (5) and the programmable logic controller (6). A radiation thermometer (12) is installed on the right side of the base. An earth pressure cell (13) is arranged below the radiation thermometer (12). A buzzer alarm (9) is arranged on the right side of the earth pressure cell (13).

2. The temperature and pressure detection and freezing system status judgment device as described in claim 1, characterized in that: The inner wall of the base is equipped with an electric heat tracing insulation layer (10), which protects multiple electronic components inside the base to operate stably at low temperatures.

3. The temperature and pressure detection and freezing system status judgment device as described in claim 2, characterized in that: The base has a notch on its side wall, and a temperature measuring window (11) is provided at the notch.

4. The temperature and pressure detection and freezing system status judgment device as described in claim 3, characterized in that: The signal receiving processor (5) is used to receive the data recorded by the radiation thermometer (12) and upload it to the programmable logic controller (6), which performs real-time logic control.

5. The temperature and pressure detection and freezing system status judgment device as described in claim 4, characterized in that: The central processing unit (7) is used to run monitoring software and computing models. A communication unit (8) is provided on one side of the central processing unit (7). The communication unit (8) is electrically connected to the programmable logic controller (6) and the central processing unit (7).

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