Shield segment simulation floating test device

Abstract

The utility model provides a shield segment simulation floating test device. Relates to the field of tunnel test simulation, and aims to solve the problem that the floating quantity change of a duct piece caused by static floating force is inconvenient to monitor at present, a model box and an accommodating cavity with a top opening are arranged, the accommodating cavity is used for accommodating slurry, a bracket is arranged above the accommodating cavity, and a pressure sensor and a displacement sensor are mounted on the bracket; the detection end of the pressure sensor and the detection end of the displacement sensor are respectively connected with a dowel bar, and the end part of the dowel bar extends into the accommodating cavity so as to abut against a test piece floating in slurry; the top surface of the bottom plate bears the model box, and the support is connected with the bottom plate through a supporting rod so as to be erected above the containing cavity; the controller is connected with the pressure sensor and the displacement sensor, the pressure sensor is used for measuring pressure information applied by the test piece to the dowel bar and sending the pressure information to the controller, and the displacement sensor is used for measuring displacement information generated when the test piece pushes the dowel bar and sending the displacement information to the controller.

Description

Technical Field

[0001] The utility model relates to the field of tunnel test simulation, and particularly relates to a shield segment simulation floating test device. Background Technique

[0002] In the construction of shield tunnels, for the segments that have just exited the tail of the shield, local or overall floating often occurs, which has been confirmed by many engineering practices. Common phenomena include cracks, breakages, segment misalignment, and even axis deviation. In water-rich areas, these problems are particularly prominent.

[0003] Controlling the floating of segments is very important in shield tunnel engineering. There are many influencing factors for segment floating. Among them, the buoyancy force on the shield segment can be divided into "static buoyancy force" and "dynamic buoyancy force". The static buoyancy force is caused by slurry, grouting slurry, or groundwater wrapping the segments, causing local segments to be immersed in a liquid environment, thereby generating buoyancy force; the dynamic buoyancy force is a force that may cause segment floating, local misalignment, cracking, crushing, or other damage forms during the construction process of post-grouting behind the segment wall of the shield tail. However, when monitoring the floating amount of segments, more attention is paid to the dynamic buoyancy force, and it is difficult to monitor the change in the floating amount caused by the static buoyancy force. Content of the Utility Model

[0004] The purpose of the utility model is to address the defects existing in the prior art and provide a shield segment simulation floating test device. A model box is provided to accommodate the slurry. The displacement sensor and the pressure sensor are used to measure the displacement change amount and the pressure change of the segment model during the solidification process of the slurry, simulating the floating of the segments generated during the solidification process of the slurry, providing data support for the floating control of segments during actual construction, and meeting the requirements of research and analysis.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] A shield segment simulation floating test device includes:

[0007] A model box, which is provided with a cavity with an open top. The cavity is used to accommodate the slurry. A support is provided above the cavity. A pressure sensor and a displacement sensor are installed on the support. The detection ends of the pressure sensor and the displacement sensor are respectively connected with a force transmission rod. The end of the force transmission rod extends into the cavity to abut against the test piece floating on the slurry;

[0008] A bottom plate, the top surface of which bears the model box. The support is connected to the bottom plate through a support rod and is erected above the cavity;

[0009] A controller, which is connected to the pressure sensor and the displacement sensor. The pressure sensor is used to measure the pressure information exerted by the test piece on the force transmission rod and send it to the controller. The displacement sensor is used to measure the displacement information generated by the test piece pushing the force transmission rod and send it to the controller.

[0010] Further, universal wheels are connected to the bottom plate. The universal wheels are arranged at the four corner positions of the bottom plate to support the bottom plate. The universal wheels are provided with locking members to lock or unlock the rotation of the universal wheels.

[0011] Further, both ends of the bracket are respectively connected to the bottom plate through support rods. After the bracket is connected to the support rods, a portal structure is formed, and the portal structure is arranged across the model box.

[0012] Further, support rods are respectively arranged on both sides of the model box, and the pressure sensor and the displacement sensor are located outside the cavity.

[0013] Further, an ultrasonic acquisition component is installed on a group of opposite side surfaces of the model box. The ultrasonic acquisition component includes an ultrasonic transmitter and an ultrasonic receiver. The ultrasonic transmitter is installed on one side surface of the model box, and the ultrasonic receiver is installed on the other side surface of the model box, and the connection line of the positions where the ultrasonic transmitter and the ultrasonic receiver are located passes through the test piece.

[0014] Further, the ultrasonic transmitter and the ultrasonic receiver are respectively connected to the controller. The ultrasonic receiver is used to receive the ultrasonic signal that passes through the cavity after being released by the ultrasonic transmitter and send it to the controller, and the controller is used to control the working parameters of the ultrasonic transmitter.

[0015] Further, the force transfer rod is detachably connected to the pressure sensor, and the force transfer rod is detachably connected to the displacement sensor.

[0016] Further, shielding shells are respectively arranged outside the pressure sensor and the displacement sensor, and the shielding shells are detachably connected to the bracket.

[0017] Further, magnetic adsorption patches are arranged on the shielding shells, and magnetic adsorption blocks are arranged at the positions corresponding to the pressure sensor and the displacement sensor on the bracket. The magnetic adsorption patches are adsorbed on the magnetic adsorption blocks to connect the pressure sensor and the displacement sensor to the bracket.

[0018] Further, the shielding shell is connected to the bracket through fasteners.

[0019] Compared with the prior art, the advantages and positive effects of the present utility model are:

[0020] (1) Aiming at the problem that it is inconvenient to monitor the change in the floating amount of the segment caused by static buoyancy at present, a model box is set to accommodate the slurry, and a displacement sensor and a pressure sensor are used to measure the displacement change and pressure change of the segment model during the solidification process of the slurry, simulating the floating of the segment generated during the solidification process of the slurry, providing data support for the floating control of the segment during actual construction, and meeting the requirements of research and analysis.

[0021] (2) Configure displacement sensors and pressure sensors for monitoring, considering the force and displacement conditions of the segment during the slurry solidification process, obtaining various data to meet the subsequent analysis requirements, and being more in line with the actual working conditions of the segment.

[0022] (3) Use an ultrasonic acquisition component to monitor the segment specimens in the model box, measure the position of the segment specimens in a non-contact manner, and continuously obtain their positions during the floating process, which can establish the dynamic changes during the floating process and meet the data requirements for visualizing the floating process. Description of the Drawings

[0023] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0024] Figure 1 It is a schematic diagram of a shield segment simulated floating test device in an embodiment of the present utility model.

[0025] Figure 2 It is a schematic diagram of segment specimens placed in the model box in an embodiment of the present utility model.

[0026] Figure 3 It is a schematic flow diagram of the shield segment simulated floating device working in an embodiment of the present utility model.

[0027] In the figure, 1. Gantry structure, 2. Model box, 3. Bottom plate, 4. Pressure sensor, 5. Force transfer rod, 6. Specimen, 7. Universal wheel, 8. Slurry, 9. Displacement sensor, 10. Static strain test system, 11. Computer, 12. Model rack, 13. Controller, 14. Ultrasonic transmitter, 15. Ultrasonic receiver. Detailed Embodiment

[0028] In a typical embodiment of the present utility model, as Figures 1 - 3 shown, a shield segment simulated floating test device is proposed.

[0029] In current shield tunnel engineering, the monitoring of segment floating mostly considers the dynamic buoyancy force, that is, the force that may cause segment floating, local dislocation, cracking, crushing or other damages during the construction process of post-grouting behind the segment wall at the shield tail, without considering the static buoyancy force. Based on this, this embodiment provides a shield segment simulated floating test device, which uses the model box 2 combined with sensors to measure the segment floating on the slurry 8, obtains the floating displacement and floating acting force of the specimen 6 during the solidification process of the slurry 8, can effectively simulate the floating phenomenon of the segment during the solidification process of the slurry 8, and provides reliable data support for the floating control of the segment during actual construction.

[0030] As Figure 1 shown, the shield segment simulated floating test device includes a model frame 12 and a controller 13. The model frame 12 is used to establish a test environment for the specimen 6 and simulate the static floating test of the specimen 6. The controller 13 is used to obtain the floating displacement and floating force of the specimen 6 during static floating.

[0031] In this embodiment, the model frame 12 includes a model box 2, a bottom plate 3, a portal structure 1 and sensors. The top surface of the bottom plate 3 bears the model box 2. The model box 2 is provided with a cavity with an open top. The cavity is used to accommodate the slurry 8. A support is provided above the cavity. The support is connected to the bottom plate 3 through support rods and is erected above the cavity. Specifically, both ends of the support are respectively connected to the bottom plate 3 through support rods. After the support is connected to the support rods, a portal structure 1 is formed. The portal structure 1 is arranged across the model box 2. The sensors are installed on the portal structure 1. The sensors include a pressure sensor 4 and a displacement sensor 9. The pressure sensor 4 and the displacement sensor 9 are installed on the support. The detection ends of the pressure sensor 4 and the displacement sensor 9 are respectively connected with a force transmission rod 5. The end of the force transmission rod 5 extends into the cavity to abut against the specimen 6 floating in the slurry 8.

[0032] The controller 13 is connected to the pressure sensor 4 and the displacement sensor 9. The pressure sensor 4 is used to measure the pressure information exerted by the specimen 6 on the force transmission rod 5 and send it to the controller 13. The displacement sensor 9 is used to measure the displacement information generated by the specimen 6 pushing the force transmission rod 5 and send it to the controller 13.

[0033] As Figure 1 shown, the model box 2 is the core component of the shield segment simulated floating test device. It is mainly composed of a rectangular box body. The size of the box body can be designed according to actual needs to ensure that it can accommodate enough slurry 8 and simulate the environment in actual construction. An opening is provided at the top of the box body to facilitate the injection of the slurry 8 and the placement of the specimen 6. The bottom and the surrounding of the box body are made of high-strength and corrosion-resistant materials to ensure that there will be no leakage or deformation during the test. It can be made of transparent acrylic board.

[0034] In this embodiment, the specimen 6 can be a segment made of carbon fiber material and is placed in the slurry 8 of the model box 2.

[0035] Above the opening at the top of the model box 2, a stable support is installed. The support can adopt a single rod structure or can be composed of multiple cross beams and columns to form a stable frame structure. On the support, the pressure sensor 4 and the displacement sensor 9 are accurately installed according to the test requirements. Each sensor is installed on the support through a special fixing device to ensure its stable position and accurate measurement.

[0036] The detection end of the pressure sensor 4 is connected to the test piece 6 through a slender force transfer rod 5. The force transfer rod 5 is made of a material with high strength and low deformation to ensure that the pressure exerted by the test piece 6 on the force transfer rod 5 can be accurately transmitted.

[0037] The displacement sensor 9 is also connected to the test piece 6 through the force transfer rod 5. However, the force transfer rod 5 of the displacement sensor 9 needs to be designed with a certain degree of flexibility in order to accurately measure the small displacement generated by the test piece 6 during the solidification of the slurry 8. Support rods are respectively provided on both sides of the model box 2. The pressure sensor 4 and the displacement sensor 9 are located outside the cavity to reduce the influence on the pressure sensor 4 and the displacement sensor 9 when adjusting the position of the model box 2 before and after the test.

[0038] The bottom plate 3 provides a stable support platform for the model box 2. Its top surface is flat and smooth to reduce the influence on the bottom of the model box 2. The bottom plate 3 can be made of heavy steel plates or concrete plates to ensure its bearing capacity and stability. The support is connected to the bottom plate 3 through multiple support rods. The support rods are designed with adjustable lengths to facilitate flexible adjustment according to the size of the model box 2 and the test requirements. The connection methods of the support rods with the support and the bottom plate 3 need to be firm and reliable to withstand various forces during the test process.

[0039] The controller 13 serves as the center of the entire test device and is responsible for receiving data signals from the pressure sensor 4 and the displacement sensor 9. The controller 13 is built-in with a high-performance data acquisition module, which can record the pressure change amount and displacement change amount of the test piece 6 during the solidification of the slurry 8 in real time and accurately.

[0040] In this embodiment, the controller 13 includes a static strain test system 10 and a computer 11. The static strain test system 10 can acquire the data of the pressure sensor 4 and the displacement sensor 9 and perform preliminary processing, and then send it to the computer 11. The computer 11 is equipped with a display screen, which can display various data during the test in real time, facilitating the operator to observe the test progress at any time. At the same time, the controller 13 also has a data storage function, and can automatically save the test data to the built-in memory or external storage device for subsequent data analysis and processing.

[0041] In this embodiment, the static strain test system 10 can adopt a DH3820 high-speed static test system, with a maximum sampling frequency of 100Hz and a maximum of 32 channels of data acquisition simultaneously. This acquisition instrument can cooperate with various bridge sensors to realize synchronous sampling monitoring of physical quantities such as pressure and displacement.

[0042] The controller 13 also has preliminary data analysis capabilities, capable of performing simple processing and analysis on the collected data, such as calculating statistical indicators like the average value and standard deviation. In addition, the controller 13 can automatically determine whether abnormal situations occur during the test process according to preset thresholds or conditions, and promptly issue an alarm or take corresponding control measures.

[0043] As Figure 3 shown, during the test, assemble the experimental model frame 12, place the model box 2 on the bottom plate 3, and adjust the positions of the brackets and struts. Insert the force transfer rods 5 of the pressure sensor 4 and the displacement sensor 9 into the designated positions inside the model box 2, and connect the sensors to the controller 13. Prepare the slurry 8 in advance, inject an appropriate amount of slurry 8 through the opening at the top of the model box 2, place the specimen 6, and ensure that the specimen 6 can be affected during the solidification process of the slurry 8. Start the controller 13 and begin to record the pressure change and displacement change of the specimen 6 during the solidification process of the slurry 8. The operator needs to closely monitor the test process, observe the changes of the specimen 6, and record the test data in a timely manner. After the test, import the collected data into the computer 11 and use professional data analysis software for further processing and analysis to obtain the test results and conclusions.

[0044] The shield segment simulation floating test device has the advantages of reasonable structure, simple operation, accurate measurement, etc., and can effectively simulate the floating phenomenon of the segment during the solidification process of the slurry 8, providing reliable data support for the floating control of the segment during actual construction.

[0045] As Figure 1 shown, universal wheels 7 are connected to the bottom plate 3. The universal wheels 7 are arranged at the four corner positions of the bottom plate 3, carrying the bottom plate 3 and capable of driving the entire model frame 12 to adjust its position. The universal wheels 7 are provided with locking members to lock or unlock the rotation of the universal wheels 7. Unlock the universal wheels 7 when position adjustment is required to enable the universal wheels 7 to rotate freely, and lock the universal wheels 7 after selecting the position and conduct the test.

[0046] As Figure 2 shown, an ultrasonic acquisition component is installed on a set of opposite side surfaces of the model box 2. The ultrasonic acquisition component includes an ultrasonic transmitter 14 and an ultrasonic receiver 15. The ultrasonic transmitter 14 is installed on one side surface of the model box 2, and the ultrasonic receiver 15 is installed on the other side surface of the model box 2, and the connection line of the positions where the ultrasonic transmitter 14 and the ultrasonic receiver 15 are located passes through the specimen 6. The ultrasonic transmitter 14 and the ultrasonic receiver 15 are respectively connected to the controller 13. The ultrasonic receiver 15 is used to receive the ultrasonic signal passing through the cavity released by the ultrasonic transmitter 14 and send it to the controller 13, and the controller 13 is used to control the working parameters of the ultrasonic transmitter 14.

[0047] Specifically, a non-contact measurement method is provided for real-time monitoring of the position change of the segment specimen 6 during the solidification of the slurry 8. The ultrasonic transmitter 14 is installed on one side of the model box 2, while the corresponding ultrasonic receiver 15 is installed on the other side of the model box 2. The installation positions of these two components need to be accurately aligned to ensure that the connection line between them can pass through the center of the specimen 6 or the predetermined monitoring point for accurate measurement of the position of the specimen 6.

[0048] The ultrasonic transmitter 14 is responsible for emitting high-frequency ultrasonic signals, which will pass through the slurry 8 in the model box 2 and shoot towards the specimen 6. The ultrasonic receiver 15 receives the ultrasonic signals reflected from the specimen 6 and converts them into electrical signals to be sent to the controller 13 for processing. The ultrasonic transmitter 14 and the ultrasonic receiver 15 are respectively connected to the controller 13 through dedicated lines. The controller 13 is not only responsible for receiving the signals sent by the ultrasonic receiver 15, but also for controlling the working parameters of the ultrasonic transmitter 14, such as the emission frequency, pulse width, etc., to ensure the accuracy and reliability of the measurement results.

[0049] The controller 13 is built-in with a dedicated algorithm for processing the signals sent by the ultrasonic receiver 15. By calculating the time difference (i.e., the acoustic time) from the emission to the reception of the ultrasonic wave, combined with the known sound wave velocity and the size parameters of the model box 2, the current position of the specimen 6 can be accurately calculated. In addition, the controller 13 can also record the change of the position of the specimen 6 over time in real-time, generate a dynamic change curve of the floating process, and provide intuitive data support for researchers.

[0050] After adding the ultrasonic acquisition component, the test process will be optimized as follows:

[0051] As Figure 3 shown, in addition to the preparation of the original equipment such as the model box 2, brackets, sensors, etc., it is also necessary to ensure the correct installation and connection of the ultrasonic acquisition component. Set the working parameters of the ultrasonic transmitter 14 through the controller 13, such as the emission frequency, pulse width, etc., to adapt to different test requirements. Start the controller 13, and at the same time start the ultrasonic acquisition component and other sensors (such as the pressure sensor 4 and the displacement sensor 9). The ultrasonic transmitter 14 starts to emit ultrasonic signals, and the ultrasonic receiver 15 receives and sends the signals to the controller 13 for processing. The controller 13 records the pressure, displacement, and position change data of the specimen 6 in real-time during the solidification of the slurry 8. The non-contact measurement method provided by the ultrasonic acquisition component will effectively supplement and verify the data of other sensors. After the test, the collected data is imported into the computer 11 and further processed and analyzed using professional data analysis software.

[0052] In particular, the data provided by the ultrasonic acquisition component can be used to generate a dynamic change curve graph or a three-dimensional animation of the floating process of the test piece 6, visually showing the floating behavior of the test piece 6 during the solidification process of the slurry 8. It can be understood that the measured data can also be imported into BIM software, a three-dimensional model can be established according to requirements, and then the displacement of the segment floating under the action of the static buoyancy force during the solidification process of the slurry 8 can be simulated.

[0053] After adding the ultrasonic acquisition component, the shield segment floating simulation test device has been significantly improved in terms of measurement accuracy, visualization level, and data richness, and can better meet the needs of research and analysis.

[0054] For the installation of the pressure sensor 4 and the displacement sensor 9, shielding shells are respectively provided outside the pressure sensor 4 and the displacement sensor 9 to reduce the influence of external components on the measurement accuracy of the sensors. The shielding shells are detachably connected to the bracket. Among them, a magnetic adsorption method can be selected for installation. Magnetic adsorption patches are provided on the shielding shells, and magnetic adsorption blocks are arranged at the positions corresponding to the pressure sensor 4 and the displacement sensor 9 on the bracket. The magnetic adsorption patches are adsorbed on the magnetic adsorption blocks to connect the pressure sensor 4 and the displacement sensor 9 to the bracket.

[0055] In other alternative embodiments, the shielding shell is connected to the bracket through fasteners, and the fasteners can be bolts, screws, etc.

[0056] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A shield segment simulated floating test device, characterized in that: include: The model box is provided with a cavity with a top opening, the cavity is used to contain slurry, a bracket is provided above the cavity, a pressure sensor and a displacement sensor are installed on the bracket, the detection end of the pressure sensor and the detection end of the displacement sensor are respectively connected to a force transmission rod, and the end of the force transmission rod extends into the cavity to abut against the test piece floating on the slurry; A bottom plate, the top surface of which bears the model box, and a bracket connected to the bottom plate through a support rod to be erected above the cavity; The controller is connected to a pressure sensor and a displacement sensor. The pressure sensor is used to measure the pressure information applied by the specimen to the force transmission rod and send it to the controller. The displacement sensor is used to measure the displacement information generated by the specimen pushing the force transmission rod and send it to the controller.

2. The shield segment simulated floating test device according to claim 1, characterized in that: The base plate is connected with a universal wheel, which is arranged at four corners of the base plate to support the base plate. The universal wheel is provided with a locking piece to lock or unlock the rotation of the universal wheel.

3. The shield segment simulated floating test device according to claim 1, characterized in that: The two ends of the bracket are connected to the bottom plate through supporting rods respectively, and the bracket forms a door-shaped structure after being connected to the supporting rods. The door-shaped structure is arranged across the model box.

4. The shield segment simulated floating test device according to claim 3, characterized in that: Support rods are respectively arranged on both sides of the model box, and a pressure sensor and a displacement sensor are located outside the cavity.

5. The shield segment simulated floating test device according to claim 1, characterized in that: An ultrasonic collection component is installed on a group of opposite sides of the model box, and the ultrasonic collection component includes an ultrasonic transmitter and an ultrasonic receiver. The ultrasonic transmitter is installed on one side of the model box, and the ultrasonic receiver is installed on the other side of the model box, and the line connecting the positions of the ultrasonic transmitter and the ultrasonic receiver passes through the test piece.

6. The shield segment simulated floating test device according to claim 5, characterized in that: The ultrasonic transmitter and the ultrasonic receiver are respectively connected to the controller. The ultrasonic receiver is used to receive the ultrasonic signal passing through the cavity after the ultrasonic transmitter is released and send it to the controller. The controller is used to control the working parameters of the ultrasonic transmitter.

7. The shield segment simulated floating test device according to claim 1, characterized in that: The force transmission rod is detachably connected to the pressure sensor, and the force transmission rod is detachably connected to the displacement sensor.

8. The shield segment simulated floating test device according to claim 7, characterized in that: The pressure sensor and the displacement sensor are respectively provided with shielding shells, and the shielding shells are detachably connected to the bracket.

9. The shield segment simulated floating test device according to claim 8, characterized in that: The shielding shell is provided with a magnetic patch, and the bracket is provided with a magnetic block at a position corresponding to the pressure sensor and the displacement sensor. The magnetic patch is adsorbed on the magnetic block to connect the pressure sensor and the displacement sensor to the bracket.

10. The shield segment simulated floating test device according to claim 8, characterized in that: The shielding shell is connected to the bracket through a fastener.

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