Shield tunnel tail grouting accompanying type monitoring system and method thereof

Abstract

The invention relates to a shield tunnel tail grouting accompanying type monitoring system and a method thereof.The system comprises an accompanying type sliding rail installed on a first frame of a shield tunneling machine, a liftable moving module is installed on the accompanying type sliding rail, the top of the moving module is connected with a monitoring module, and the monitoring module is connected with a data storage processing module; the moving module moves along the following type sliding rail, and the monitoring module correspondingly moves to a to-be-monitored position by adjusting the height of the moving module; the monitoring module is used for collecting an elastic wave signal after exciting a seismic source, converting the elastic wave signal into a data file and transmitting the data file to the data storage processing module; and the data storage processing module is used for analyzing and processing to obtain the grouting filling degree and the distribution condition, and performing visual display. Compared with the prior art, automatic, real-time and accurate monitoring can be carried out in the grouting process, and the filling degree of the slurry behind the shield tunnel segment wall can be obtained through automatic and accurate detection.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering monitoring, and in particular to a shield tunnel tail grouting accompanying monitoring system and method thereof. Background Art

[0002] In recent years, geotechnical and underground space engineering has developed rapidly, among which shield method has been widely used in tunnel construction. Shield construction will inevitably disturb the original geostress field of the soil layer, thereby causing settlement or uplift of the surface. Because the excavation diameter of the shield cutterhead is about 15 cm larger than the outer diameter of the segment, slurry needs to be injected in time after the segment is out of the shield tail to reduce soil loss, in order to limit the displacement and deformation of the segment while effectively controlling the surface settlement. In addition, uniform and effective shield tail grouting can serve as the first layer of protection for tunnel anti-seepage and improve the overall stability of the shield tunnel structure.

[0003] At present, the grouting construction of shield tunnels still relies heavily on construction experience. The shield tail grouting itself is hidden and uncertain. At present, the quality assessment of the grouting effect is usually based on the monitoring of the settlement of surface buildings after the completion of the tunnel construction. At this time, the losses caused by grouting defects have actually occurred. The grouting effect of shield tunnels directly affects the construction safety and the stability of surface buildings. How to obtain the slurry distribution behind the segment wall and the evaluation of the grouting effect has always been the focus of research in the engineering and academic circles. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a shield tunnel tail grouting accompanying monitoring system and method, which can perform automatic, real-time and accurate monitoring during the grouting process and can automatically and accurately detect the slurry fullness behind the shield tunnel segment wall.

[0005] The object of the present invention can be achieved by the following technical scheme: a shield tunnel tail grouting accompanying monitoring system, comprising an accompanying slide rail installed on the first frame of a shield machine, a lifting and lowering mobile module installed on the accompanying slide rail, a monitoring module connected to the top of the mobile module, the monitoring module connected to a data storage and processing module, the mobile module moves along the accompanying slide rail, and by adjusting its own height, the monitoring module moves to a position to be monitored accordingly;

[0006] The monitoring module is used to collect elastic wave signals after exciting the earthquake source, and convert the elastic wave signals into data files and transmit them to the data storage processing module;

[0007] The data storage and processing module is used to analyze and process the grouting filling degree and distribution, and to perform visual display.

[0008] Furthermore, the accompanying slide rail is assembled from modular arc-shaped components.

[0009] Furthermore, the mobile module includes a base, which is coupled to the accompanying slide rail through a transmission shaft and a transmission pulley, and a servo controller and a lifting bracket are installed on the base, and the lifting bracket is connected to a support platform, and the support platform is connected to the monitoring module. The servo controller is respectively connected to the transmission shaft and the lifting bracket, and is used to control the rotation state of the transmission shaft to drive the base to move along the accompanying slide rail, and control the movement of the lifting bracket to adjust the height position of the support platform.

[0010] Furthermore, the monitoring module includes a detector array, a seismometer and a pneumatic impact hammer, the detector array is arranged on the detection platform, the pneumatic impact hammer is arranged at the center position of the detector array, the detector array is connected to the seismometer, the seismometer is connected to the data storage and processing module, and the pneumatic impact hammer is connected to the servo controller, and the working state of the pneumatic impact hammer is controlled by the servo controller.

[0011] Furthermore, the detection platform is installed on the supporting platform through a connecting rod, and the seismometer is directly installed on the supporting platform.

[0012] Furthermore, the detector array includes a plurality of detectors distributed in a rectangular shape, and a buffer device is provided at the bottom of each detector.

[0013] Furthermore, the servo controller includes a control valve, a motor and a master control end, the master control end is connected to the motor, the motor is respectively connected to the transmission shaft and the lifting bracket, and the master control end is also integrated with a valve control port connected to a pneumatic impact hammer.

[0014] Furthermore, the frequency of elastic waves excited by the impact source of the pneumatic impact hammer is 800-1300 Hz.

[0015] A method for monitoring the grouting at the tail end of a shield tunnel comprises the following steps:

[0016] S1. According to the monitoring requirements of the shield tunnel and the working clearance requirements of the shield machine, the monitoring angle data is determined to determine the structural design of the detector array and the accompanying slide rail;

[0017] S2, connect the accompanying slide rails in sequence and connect them to the first frame of the shield machine, then install the mobile module and the monitoring module, and connect the monitoring module to the data storage and processing module;

[0018] S3, the mobile module moves along the accompanying slide rail to the position to be detected, and then adjusts its own height position so that the top of the measuring point of the detector array in the monitoring module contacts the inner wall of the shield tunnel segment;

[0019] S4, start the pneumatic impact hammer in the monitoring module to excite the elastic wave at the center of the detection area once. After the pneumatic impact hammer completes the elastic wave excitation, the hammer body falls away from the inner wall of the pipe segment. During the detection process of the current detection area, the pneumatic impact hammer no longer contacts the inner wall of the pipe segment.

[0020] S5. The detector array receives the corresponding elastic wave signal, translates the elastic wave signal through the seismometer, saves it as a .dat data file, and transmits it to the data storage and processing module. Through real-time data analysis and processing, the visualization of the shield tail grouting filling degree and distribution is realized.

[0021] Furthermore, the data analysis and processing process in step S5 includes: filtering, waveform visualization, wavelet processing, and comprehensive plane distribution.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention installs a traveling rail on the first frame of the shield machine, installs a movable module that can be raised and lowered on the traveling rail, connects a monitoring module to the top of the movable module, connects the monitoring module to the data storage processing module, uses the movable module to move along the traveling rail, and adjusts its own height to move the monitoring module to the position to be detected; uses the monitoring module to excite the source and collect elastic wave signals, and converts the elastic wave signals into data files and transmits them to the data storage processing module; uses the data storage processing module to analyze and process the grouting filling degree and distribution, and displays them visually. Therefore, when the shield construction advances one ring, it can advance one ring with the shield machine and perform one or more rounds of detection along the ring direction, and can perform automatic, real-time and accurate monitoring during the grouting process, and can automatically and accurately detect the filling degree of the slurry behind the shield tunnel segment wall.

[0024] 2. The present invention sets a servo controller in the mobile module and sets a pneumatic impact hammer located at the center of the detector array in the monitoring module. The servo controller is used to control the movement and height adjustment of the mobile module and the working state of the pneumatic impact hammer, thereby realizing the automatic movement, lifting and source excitation process, which can greatly improve the intelligence and efficiency of the present invention.

[0025] 3. The present invention connects the monitoring module with the data storage processing module, which performs a series of operations such as filtering, waveform visualization, wavelet processing, and comprehensive plane distribution on the data file to realize the visualization display of the grouting filling degree, which can not only monitor in real time during the grouting process, but also carry out the grouting effect evaluation after the grouting is completed. Through the visualization and evaluation of the shield tail grouting process and the final grouting effect, the automatic monitoring and detection of the slurry filling degree behind the shield tunnel segment wall is realized, which can provide a basis for the subsequent grouting parameter adjustment and supplementary grouting, thereby effectively improving the overall level and effect of the grouting project. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0027] Figure 2 It is a connection diagram of the mobile module and the monitoring module in the present invention;

[0028] Figure 3 It is a schematic diagram of a modular arc-shaped component of the accompanying slide rail in the present invention;

[0029] Figure 4 It is a schematic diagram of the connection between the detector and the buffer device in the present invention;

[0030] Figure 5 It is a schematic diagram of the method flow of the present invention;

[0031] Figure 6 It is a schematic diagram of the application process of the embodiment;

[0032] Figure 7 Schematic diagram of the detection sequence along the circumferential direction of the shield segment in the embodiment;

[0033] Figure 8a A schematic diagram of raw elastic wave data in an embodiment;

[0034] Figure 8b A schematic diagram of elastic wave waveform visualization processing in an embodiment;

[0035] Figure 8c It is a schematic diagram of the plane distribution of the shield tail grouting filling degree in the embodiment;

[0036] Explanation of the marks in the figure: 1. Pneumatic impact hammer, 2. Detector, 3. Buffer device, 4. Support platform, 5. Connecting rod, 6. Detection platform, 7. Seismometer, 8. Lifting bracket, 9. Servo controller, 10. Drive pulley, 11. Drive shaft, 12. Base, 13. Traveling slide rail, 14. Data storage and processing module, 15. Monitoring module, 16. Mobile module. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example

[0039] like Figure 1 and Figure 2 As shown, a shield tunnel tail grouting accompanying monitoring system includes an accompanying slide rail 13 installed on the first frame of the shield machine, and the accompanying slide rail 13 is assembled from modular arc-shaped components (such as Figure 3 As shown), a movable module 16 that can be raised and lowered is installed on the accompanying slide rail 13, a monitoring module 15 is connected to the top of the movable module 16, the monitoring module 15 is connected to the data storage and processing module 14, the movable module 16 moves along the accompanying slide rail 13, and adjusts its own height to move the monitoring module 15 to the position to be monitored;

[0040] The monitoring module 15 is used to collect elastic wave signals after exciting the earthquake source, and convert the elastic wave signals into data files and transmit them to the data storage and processing module 14;

[0041] The data storage and processing module 14 is used to analyze and process the grouting filling degree and distribution, and to display them visually.

[0042] Specifically, the mobile module 16 includes a base 12, which is coupled to the accompanying slide rail 13 through a transmission shaft 11 and a transmission pulley 10. A servo controller 9 and a lifting bracket 8 are installed on the base 12. The lifting bracket 8 is connected to the support platform 4, and the support platform 4 is connected to the monitoring module 15. The servo controller 9 is respectively connected to the transmission shaft 11 and the lifting bracket 8, and is used to control the rotation state of the transmission shaft 11 to drive the base 12 to move along the accompanying slide rail 13, and control the movement of the lifting bracket 8 to adjust the height position of the support platform 4.

[0043] The monitoring module 15 includes a detector array, a seismometer 7 and a pneumatic impact hammer 1. The detector array is arranged on a detection platform 6. The detector array includes a plurality of detectors 2 distributed in a rectangular shape. A buffer device 3 (such as Figure 4 The pneumatic impact hammer 1 is arranged at the center of the geophone array, the geophone array is connected to the seismometer 7, the seismometer 7 is connected to the data storage and processing module 14, the pneumatic impact hammer 1 is connected to the servo controller 9, and the servo controller 9 controls the working state of the pneumatic impact hammer 1. The detection platform 6 is installed on the support platform 4 through the connecting rod 5, and the seismometer 7 is directly installed on the support platform 4.

[0044] In addition, the servo controller 9 includes a control valve, a motor and a master control terminal, the master control terminal is connected to the motor, the motor is respectively connected to the transmission shaft 11 and the lifting bracket 8, and the master control terminal is also integrated with a valve control port of the pneumatic impact hammer 1. In this embodiment, the elastic wave frequency excited by the impact source of the pneumatic impact hammer 1 is 800-1300Hz.

[0045] Based on the above monitoring system, a shield tunnel tail grouting accompanying monitoring method is realized, such as Figure 5 As shown, the following steps are included:

[0046] S1. According to the monitoring requirements of the shield tunnel and the working clearance requirements of the shield machine, the monitoring angle data is determined to determine the structural design of the detector array and the accompanying slide rail;

[0047] S2, connect the accompanying slide rails in sequence and connect them to the first frame of the shield machine, then install the mobile module and the monitoring module, and connect the monitoring module to the data storage and processing module;

[0048] S3, the mobile module moves along the accompanying slide rail to the position to be detected, and then adjusts its own height position so that the top of the measuring point of the detector array in the monitoring module contacts the inner wall of the shield tunnel segment;

[0049] S4, start the pneumatic impact hammer in the monitoring module to excite the elastic wave at the center of the detection area once. After the pneumatic impact hammer completes the elastic wave excitation, the hammer body falls away from the inner wall of the pipe segment. During the detection process of the current detection area, the pneumatic impact hammer no longer contacts the inner wall of the pipe segment.

[0050] S5. The detector array receives the corresponding elastic wave signal, translates the elastic wave signal through the seismometer, saves it as a .dat data file, and transmits it to the data storage and processing module. Through real-time data analysis and processing (including: filtering, waveform visualization, wavelet processing, and comprehensive plane distribution), the visualization display of the shield tail grouting filling degree and distribution is achieved.

[0051] This embodiment applies the above technical solution, and the main process is as follows Figure 6 As shown:

[0052] 1. According to the shield tunnel inspection requirements and shield machine working clearance requirements, determine the circumferential monitoring and inspection angles (the circumferential monitoring and inspection angles are 0 to 180°), and further determine the specific forms of the detector array and accompanying slide rails.

[0053] 2. Connect the accompanying slide rails one by one and connect them to the first frame of the shield machine.

[0054] 3. Install the servo controller and mobile lifting bracket;

[0055] Connect the control valve of the pneumatic impact hammer to the servo controller, set the source excitation mode of the pneumatic impact hammer to single excitation, and after the excitation, the hammer body leaves the inner wall of the shield tunnel segment;

[0056] Connect the intelligent servo controller to the motor, lifting bracket, and drive shaft of the base.

[0057] 4. Install and connect the high-precision broadband seismograph and the detector array to ensure that the data transmission (wired / wireless) between the high-precision broadband seismograph and the control room computer is correct.

[0058] 5. The servo controller is used to control the mobile module to move to the predetermined detection position, and the top of the measuring point of the detector array is tightly fitted to the inner wall of the shield tunnel segment through the lifting bracket.

[0059] 6. Operate the pneumatic impact hammer switch of the servo controller to perform a single elastic wave excitation at the center of the detection area. After the pneumatic impact hammer completes the elastic wave excitation, the hammer body falls away from the inner wall of the segment. During the detection of this area, the hammer body no longer contacts the inner wall of the segment. It should be noted that after completing the monitoring and detection work of this area, the servo controller continues to control the mobile module to move along the accompanying slide rail to the next detection position, so as to carry out subsequent monitoring and detection work along the circumferential direction of the shield segment, such as Figure 7 As shown, this embodiment adopts a clockwise detection direction, but in practical applications it is not limited to the clockwise direction.

[0060] 7. The detector array receives the corresponding elastic wave signal, and the elastic wave signal is translated and saved as a .dat data file through a high-precision broadband seismograph.

[0061] 8. The data file is transmitted to the data storage and processing module in the control room. Through a series of processing work such as filtering, waveform visualization, wavelet processing, and comprehensive plane distribution of elastic wave data, a visualization display of the shield tail grouting filling degree and distribution is achieved (such as Figures 8a to 8c shown).

[0062] In summary, the accompanying monitoring system proposed in this scheme mainly includes: a pneumatic impact hammer, a detector array, a buffer device, a support platform, a connecting rod, a detection platform, a seismometer, a lifting bracket, a servo controller, a drive pulley, a drive shaft, a base, a traveling slide rail, and a data storage and processing module. Among them, the traveling slide rail is a modular arc-shaped component, which is based on the actual monitoring and detection needs and the working clearance requirements of the shield machine. The composition of the traveling slide rail is determined, and after assembly, it can be connected to the first frame of the shield machine by welding or other methods. In this way, every time the shield construction advances one ring, the mobile module can carry the monitoring module with the shield machine to advance one ring, and perform one or more rounds of detection along the ring direction.

[0063] The detector array, the buffer device, the pneumatic impact hammer, the seismometer and the connecting rod together form a monitoring module, and the monitoring module is connected to the mobile module.

[0064] The mobile module consists of a servo controller, a lifting bracket, a drive pulley, a drive shaft and a base. The mobile module is coupled to the accompanying slide rail through the drive shaft and the pulley. The servo controller controls the movement of the base on the accompanying slide rail to achieve monitoring and detection along the circumferential direction of the shield segment.

[0065] The detector array can change the array layout characteristics according to the actual requirements of on-site detection, such as using different layout methods such as 2×2 and 3×3 for detection.

[0066] The detector array is close to the inner wall of the shield tunnel during the monitoring process. The detector array is connected by connectors and integrated into the detection platform. A buffer device is set under the detector. The detector can have a certain vibration margin. The existence of the buffer can effectively avoid the interference of impact vibration on data collection.

[0067] The servo controller mainly includes four parts: control valve, wire, motor and master control end, which integrates the transmission control of the pneumatic impact hammer, base and lifting bracket. The operation of the motor is controlled by the master control end to realize the automatic movement (in actual application, the movement mode can be designed as a variety of modes such as uniform speed movement and fixed time difference pause) and lifting of the base on the accompanying slide rail. The air valve control port of the pneumatic impact hammer is integrated into the master control end, and the compressed air volume of the magnetic piston is controlled by setting the air valve to achieve a single impact with the required impact force.

[0068] The pneumatic impact hammer is used as an impact source to excite elastic waves, and the impact mode is set to inject compressed air and excite once. After the impact hammer is started and the source excitation is completed, the hammer body leaves the inner wall of the shield tunnel segment and no longer contacts the segment.

[0069] The detector array receives elastic wave signals and forms data files through the seismometer, which are then transmitted to the control room computer via wired or wireless means to save and visualize the corresponding data files.

[0070] This scheme is suitable for monitoring and detecting the grouting degree of the shield tunnel during and after the grouting is completed. The accompanying slide rail is installed on the first frame of the shield machine, and can move in the shield machine's forward direction. Through the movement and lifting of the base on the slide rail, the detector array and the pneumatic impact hammer are in contact with the inner wall of the shield tunnel segment. The pneumatic impact hammer is used as an impact source to excite elastic waves, and the elastic wave signal is received by the detector array and transmitted as a data file and saved in the computer in the control room. After completing the data collection of a certain area, the base moves on the slide rail to realize the monitoring and detection of the equipment along the circumferential direction of the shield segment. Finally, the elastic wave data is filtered, visualized, wavelet processed, and integrated plane distributed to complete the visualization of the grouting degree behind the shield segment wall. This scheme can be used for real-time monitoring during the grouting process, and can also be used for the detection and evaluation of the degree of fullness after the grouting is completed, which is beneficial to the grouting construction and quality control of the shield tunnel.

[0071] This solution has the following advantages:

[0072] The detection process is efficient and intelligent: the servo controller controls the movement of the equipment and the opening and closing of the gas valve to achieve automatic movement, lifting and source excitation of the system;

[0073] Safety and convenience: The entire testing process only requires monitoring the grouting filling results in the control room, which is safe and convenient;

[0074] High degree of real-time visualization: The data storage and processing module in the control room processes relevant data files to achieve a visual display of the grouting filling degree, which can be used for real-time monitoring during the grouting process and for grouting effect evaluation after the grouting is completed;

[0075] Optimize the quality of shield tail grouting: Through the visual display and evaluation of the shield tail grouting process and the final grouting effect, the automatic monitoring and detection of the slurry filling degree behind the shield tunnel segment wall can be realized, providing a basis for grouting parameter adjustment and supplementary grouting, which can effectively improve the overall level and effect of the grouting project.

Claims

1. A shield tunnel tail grouting accompanying monitoring system, characterized in that: The invention comprises a traveling slide rail (13) installed on the first frame of the shield machine, a lifting and lowering movable module (16) is installed on the traveling slide rail (13), a monitoring module (15) is connected to the top of the movable module (16), the monitoring module (15) is connected to the data storage and processing module, the movable module (16) moves along the traveling slide rail (13), and adjusts its own height to make the monitoring module (15) move to the position to be monitored accordingly; The monitoring module (15) is used to collect elastic wave signals after exciting the earthquake source, and convert the elastic wave signals into data files and transmit them to the data storage and processing module; The data storage and processing module is used to analyze and process the grouting filling degree and distribution, and to perform visual display.

2. A shield tunnel tail grouting accompanying monitoring system according to claim 1, characterized in that: The accompanying slide rail (13) is assembled from modular arc-shaped components.

3. The shield tunnel tail grouting accompanying monitoring system according to claim 1 is characterized in that: The mobile module (16) comprises a base (12), the base (12) is coupled to a traveling slide rail (13) via a transmission shaft (11) and a transmission pulley (10), a servo controller (9) and a lifting bracket (8) are mounted on the base (12), the lifting bracket (8) is connected to a support platform (4), the support platform (4) is connected to a monitoring module (15), the servo controller (9) is respectively connected to the transmission shaft (11) and the lifting bracket (8), and is used to control the rotation state of the transmission shaft (11) to drive the base (12) to move along the traveling slide rail (13), and to control the movement of the lifting bracket (8) to adjust the height position of the support platform (4).

4. A shield tunnel tail grouting accompanying monitoring system according to claim 3, characterized in that: The monitoring module (15) comprises a geophone array, a seismometer (7) and a pneumatic impact hammer (1); the geophone array is arranged on a detection platform (6); the pneumatic impact hammer (1) is arranged at the center of the geophone array; the geophone array is connected to the seismometer (7); the seismometer (7) is connected to a data storage and processing module; the pneumatic impact hammer (1) is connected to a servo controller (9); and the servo controller (9) controls the working state of the pneumatic impact hammer (1).

5. A shield tunnel tail grouting accompanying monitoring system according to claim 4, characterized in that: The detection platform (6) is installed on the supporting platform (4) via a connecting rod (5), and the seismometer (7) is directly installed on the supporting platform (4).

6. A shield tunnel tail grouting accompanying monitoring system according to claim 4, characterized in that: The detector array comprises a plurality of detectors (2) distributed in a rectangular shape, and a buffer device (3) is provided at the bottom of each detector (2).

7. The shield tunnel tail grouting accompanying monitoring system according to claim 4 is characterized in that: The servo controller (9) comprises a control valve, a motor and a master control end, wherein the master control end is connected to the motor, and the motor is respectively connected to a transmission shaft (11) and a lifting bracket (8), and the master control end is also integrated with a valve control port connected to a pneumatic impact hammer (1).

8. A shield tunnel tail grouting accompanying monitoring system according to any one of claims 1 to 7, characterized in that: The frequency of the elastic wave excited by the impact source of the pneumatic impact hammer (1) is 800-1300 Hz.

9. A shield tunnel tail grouting accompanying monitoring method using the shield tunnel tail grouting accompanying monitoring system as claimed in claim 4, characterized in that: The following steps are involved: S1. According to the monitoring requirements of the shield tunnel and the working clearance requirements of the shield machine, the monitoring angle data is determined to determine the structural design of the detector array and the accompanying slide rail; S2, connect the accompanying slide rails in sequence and connect them to the first frame of the shield machine, then install the mobile module and the monitoring module, and connect the monitoring module to the data storage and processing module; S3, the mobile module moves along the accompanying slide rail to the position to be detected, and then adjusts its own height position so that the top of the measuring point of the detector array in the monitoring module contacts the inner wall of the shield tunnel segment; S4, start the pneumatic impact hammer in the monitoring module to excite the elastic wave at the center of the detection area once. After the pneumatic impact hammer completes the elastic wave excitation, the hammer body falls away from the inner wall of the pipe segment. During the detection process of the current detection area, the pneumatic impact hammer no longer contacts the inner wall of the pipe segment. S5. The detector array receives the corresponding elastic wave signal, translates the elastic wave signal through the seismometer, saves it as a .dat data file, and transmits it to the data storage and processing module. Through real-time data analysis and processing, the visualization of the shield tail grouting filling degree and distribution is realized.

10. A shield tunnel tail grouting accompanying monitoring method according to claim 9, characterized in that: The data analysis and processing process in step S5 includes: filtering, waveform visualization, wavelet processing, and comprehensive plane distribution.

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