A device for detecting the freezing effect of the whole construction process of a liaison channel

Abstract

This utility model discloses a device for detecting the freezing effect throughout the construction process of a connecting passage, comprising: an acoustic detection system including a first acoustic transmitter arranged along the central axis of the connecting passage, a second acoustic transmitter and a third acoustic transmitter respectively arranged between the structure and the freezing pipe, and a first acoustic receiver, a second acoustic receiver, a third acoustic receiver, and a fourth acoustic receiver arranged circumferentially along the outer side of the frozen wall; an electrical resistivity detection system including needle-shaped electrodes respectively arranged around the perimeter of the connecting passage, with the two outer needle-shaped electrodes on each side being current electrodes and the two inner needle-shaped electrodes being voltage electrodes; and a data processing system including an acquisition module, a processing module, a transmission module, a data storage module, and a visualization module. This utility model improves the real-time performance and accuracy of detecting the freezing effect throughout the construction process of a connecting passage by combining the characteristics of ultrasonic wave propagation with resistivity electrical resistivity detection.

Description

Technical Field

[0001] This utility model relates to the field of construction technology for connecting passages, and in particular to a device for detecting the freezing effect throughout the construction process of connecting passages. Background Technology

[0002] In the construction of underground rail transit, the artificial freezing method has been widely used due to its advantages such as environmental friendliness, high stability, rapid temperature change, and small freezing range. It is particularly common in the construction of connecting passages for subway systems in soft soil areas such as water-rich silt deposits.

[0003] However, the assessment of the artificial freezing effect in underground connecting passages often uses a combination of temperature and pressure relief hole monitoring to infer the thickness of the freezing curtain. Due to environmental limitations and the arrangement of monitoring holes, this method can only reflect the local situation and cannot accurately grasp the overall development of the freezing front. Consequently, there are problems with the inaccurate determination of freezing front development, freezing curtain thickness, and whether the freezing has reached a complete circle. This makes it difficult to truly reflect whether the freezing construction has achieved the expected design effect, which will cause significant safety risks to the next stage of construction.

[0004] Therefore, in order to solve the above problems, it is urgent to design a device for detecting the freezing effect throughout the construction process of connecting passages. Utility Model Content

[0005] The purpose of this invention is to improve the real-time performance and accuracy of freezing effect detection throughout the construction process of connecting passages, and to ensure the safety of underground freezing construction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a device for detecting the freezing effect throughout the construction process of a connecting passage, including:

[0008] The acoustic detection system includes a first acoustic transmitter arranged in a first acoustic emission hole on the central axis of the connecting passage, a second acoustic transmitter and a third acoustic transmitter arranged in a second acoustic emission hole and a third acoustic emission hole respectively in the middle of the structure and the freezing pipe, and a first acoustic receiver, a second acoustic receiver, a third acoustic receiver and a fourth acoustic receiver arranged circumferentially along the outer side of the freezing wall.

[0009] Electrical detection system: includes needle-shaped electrodes respectively set around the communication channel, with the two outer needle-shaped electrodes on each side being current electrodes and the two inner needle-shaped electrodes being voltage electrodes;

[0010] Data processing system: includes acquisition module, processing module, transmission module, data storage module and visualization display module.

[0011] Furthermore, the first acoustic transmitter performs bidirectional transmission and reception functions during the active freezing period of the communication channel; the second and third acoustic transmitters are activated during the excavation period of the communication channel to monitor the state of the frozen wall during the excavation stage.

[0012] Furthermore, the first, second, and third acoustic transmitters are all integrated transceiver devices.

[0013] Furthermore, the first, second, third, and fourth acoustic receivers are respectively arranged in the first, second, third, and fourth acoustic receiving holes circumferentially on the outside of the frozen wall, and the depth of the first, second, third, and fourth acoustic receiving holes extends to the central axis of the communication channel.

[0014] Furthermore, the distance between the needle-shaped electrodes is dynamically adjusted according to the thickness of the frozen wall.

[0015] Furthermore, the acquisition module acquires and receives detection data from the acoustic detection system and the electrical detection system.

[0016] Furthermore, the processing module analyzes and processes the detection data received by the acquisition module, calculates the wave velocity based on the propagation time of the ultrasonic wave in the frozen soil area of ​​the transceiver, and calculates the resistivity of the frozen soil layer during excavation based on the value measured by the needle electrode.

[0017] Furthermore, the transmission module transmits the results analyzed and processed by the processing module to the data storage module via wireless transmission.

[0018] Furthermore, the data storage module uses a database deployed on a cloud server or a self-built server to store the data output by the data processing module;

[0019] Furthermore, the visualization module displays the data stored in the data storage module on the front end based on a B / S architecture or a C / S architecture.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. This utility model utilizes a first acoustic transmitter located in the first acoustic emission hole on the central axis of the connecting passage to perform bidirectional transmission and reception during the active freezing period of the connecting passage. Second and third acoustic transmitters located in the second and third acoustic emission holes, respectively, located between the structure and the freezing pipe, are activated during the excavation period of the connecting passage to monitor the state of the frozen wall during excavation. Four acoustic receivers arranged circumferentially along the outer side of the frozen wall receive the ultrasonic signals from the acoustic transmitters, obtaining the propagation time of the ultrasonic waves in the frozen soil area of ​​the transceiver, and then calculating the wave velocity to reflect the freezing state. This solves the technical problem of existing methods that rely on temperature holes and pressure relief holes to infer the thickness of the frozen curtain, which are limited by the environment and the arrangement of detection holes, and can only reflect local conditions, failing to grasp the overall development of the freezing front.

[0022] 2. This utility model, by setting four needle-shaped electrodes around the cross-section of the connecting passage at a key position 0.5m from the funnel opening of the connecting passage, namely in the four directions of top, bottom, left, and right, with the two outer needle-shaped electrodes being current electrodes and the two inner needle-shaped electrodes being voltage electrodes, measures and calculates the resistivity of the target stratum under frozen state, which helps to judge the integrity and state of the frozen wall in front of and on the side wall of the excavation face, and improves the accuracy of judging the thickness of the frozen curtain, the position of the frozen front, and the state of the frozen circle.

[0023] 3. This utility model uses a data acquisition module to send acquisition commands and receive acoustic wave and electrical resistivity detection data. A processing module analyzes and processes the acoustic wave and electrical resistivity detection data, calculates wave velocity and resistivity, and a transmission module wirelessly transmits the results analyzed and processed by the processing module to a data storage module. The data storage module uses a database deployed on a cloud server or a self-built server to store the data output by the data processing module. A visualization module displays the data stored in the data storage module on the front end based on a B / S architecture or a C / S architecture, enabling construction managers to clearly understand the freezing effect and facilitate decision-making.

[0024] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the arrangement of the transverse acoustic wave detection system and the electrical detection system for the communication channel according to an embodiment of the present invention is shown;

[0027] Figure 2 A schematic diagram of the arrangement of the longitudinal acoustic wave detection system and the electrical detection system for the communication channel according to an embodiment of the present invention is shown;

[0028] Figure 3 A schematic diagram of the data processing system according to an embodiment of the present invention is shown.

[0029] In the diagram: 1. Communication channel; 2. First acoustic wave emitting port; 3. Second acoustic wave emitting port; 4. Third acoustic wave emitting port; 41. Third acoustic wave transmitter; 5. First acoustic wave receiving port; 6. Second acoustic wave receiving port; 7. Third acoustic wave receiving port; 71. Third acoustic wave receiver; 8. Fourth acoustic wave receiving port; 81. Fourth acoustic wave receiver; 9. Needle electrode; 91. Current electrode; 92. Voltage electrode; 10. Acquisition module; 11. Processing module; 12. Transmission module; 13. Data storage module; 14. Visualization module. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] like Figure 1-3 As shown, this utility model provides a device for detecting the freezing effect throughout the construction process of a connecting passage, comprising:

[0033] The acoustic detection system includes a first acoustic transmitter located in the first acoustic emission hole 2 on the central axis of the connecting channel 1; a second acoustic transmitter and a third acoustic transmitter 41 located in the second acoustic emission hole 3 and the third acoustic emission hole 4 respectively located in the middle of the connecting channel 1 and the freezing pipe; and a first acoustic receiver, a second acoustic receiver, a third acoustic receiver 71, and a fourth acoustic receiver 81 arranged circumferentially along the outer side of the designed freezing wall range for receiving ultrasonic waves during detection. By setting four acoustic receivers, this application can obtain the speed of ultrasonic waves propagating in the soil in different directions, thereby more accurately reflecting the freezing effect and whether the freezing is complete.

[0034] Specifically, this application uses a sound wave transmitter and a sound wave receiver to detect the propagation time of ultrasonic waves in the soil. Since the distance between the sound wave transmitter and the sound wave receiver is known, the propagation speed of ultrasonic waves in the soil can be obtained. Based on the correspondence between the elastic modulus of the soil and the wave velocity, the elastic modulus of the soil is calculated, thereby reflecting the freezing effect and whether the soil has formed a ring based on the change in the modulus.

[0035] Electrical resistivity testing system: Includes needle-shaped electrodes 9 set around the connecting passage 1 at a distance of 0.5m from the funnel opening. The two outer needle-shaped electrodes 9 on each side are current electrodes 91, and the two inner needle-shaped electrodes 9 are voltage electrodes 92. Electricity is passed to the ground through the two current electrodes 91, and the two voltage electrodes 92 measure this voltage. The current resistance value of the soil is obtained based on the voltage value measured by the voltage electrodes 92 and the current value conducted by the current electrodes 91. The resistivity of the stratum under frozen state is calculated, which reflects the freezing effect.

[0036] The distance between the needle electrodes 9 is dynamically adjusted according to the thickness of the frozen wall, using a four-level equidistant method. The distance between the needle electrodes 9 is approximately 0.25 times the designed thickness of the frozen wall.

[0037] Data processing system: including acquisition module 10, processing module 11, transmission module 12, data storage module 13 and visualization display module 14.

[0038] Preferably, the first acoustic transmitter performs bidirectional transmission and reception during the active freezing period of the connecting passage 1 to ensure more accurate detection results; the second and third acoustic transmitters 41 are activated during the excavation period of the connecting passage 1 to detect the freezing effect during the excavation period of the connecting passage 1, ensuring construction safety.

[0039] Preferably, the first, second, and third acoustic transmitters 41 are all transceiver integrated devices, which can be used as the source and receiver for detecting ultrasonic waves.

[0040] Preferably, the first acoustic receiver, the second acoustic receiver, the third acoustic receiver 71, and the fourth acoustic receiver 81 are respectively arranged in the first acoustic receiving hole 5, the second acoustic receiving hole 6, the third acoustic receiving hole 7, and the fourth acoustic receiving hole 8 in the circumferential direction outside the frozen wall, and the depth of the first acoustic receiving hole 5, the second acoustic receiving hole 6, the third acoustic receiving hole 7, and the fourth acoustic receiving hole 8 extends to the central axis of the connecting channel 1.

[0041] Preferably, the acquisition module 10 acquires and receives detection data from the acoustic detection system and the electrical detection system. The ultrasonic detection system and the electrical detection system use different acquisition modules and acquire data separately. The ultrasonic detection system transmits pulse signals of a corresponding frequency to the transmitting transducer via a drive circuit, and the acquisition module acquires the corresponding propagation time data. The electrical detection system uses a power supply to energize the electrodes, and the acquisition module acquires the corresponding resistivity data.

[0042] Preferably, the processing module 11 analyzes and processes the detection data received by the acquisition module 10, calculates the wave velocity based on the time it takes for the ultrasonic wave to propagate in the frozen soil area of ​​the transceiver, and calculates the resistivity of the frozen soil layer during excavation based on the value measured by the needle electrode.

[0043] Specifically, the wave velocity calculation based on the propagation time of ultrasonic waves in the frozen soil region of the transceiver is as follows: Given the time it takes for the ultrasonic waves to propagate in the soil as detected by the sound wave transmitter and receiver, and the known distance between the transmitter and receiver, the propagation velocity of the ultrasonic waves in the soil can be obtained as V = L / T, where V represents the propagation velocity, L represents the distance between the transmitter and receiver, and T represents the propagation time of the ultrasonic waves as detected by the transmitter and receiver. Based on the relationship between the elastic modulus of the soil and the wave velocity, the elastic modulus of the soil is calculated, and the change in modulus reflects the freezing effect and whether a complete freeze has occurred.

[0044] The resistivity of the frozen soil layer during excavation is calculated based on the values ​​measured by the needle electrodes. Specifically, the current soil resistance value R is obtained by measuring the voltage value of the voltage electrode 92 and the current value conducted by the current electrode 91. The resistivity is then calculated by combining the distance between the needle electrodes 9. The formula for calculating the resistivity is: ρ = 2πaR. The resistivity reflects the freezing effect.

[0045] Specifically, this application combines an acoustic wave detection system with an electrical resistivity detection system. The acoustic wave detection system utilizes the characteristic that the acoustic parameters of ultrasound waves change with phase changes during propagation in soil, and obtains the freezing effect based on the relationship between wave velocity and soil elastic modulus. The electrical resistivity detection system obtains the freezing effect by detecting the change in resistivity before and after freezing. The acoustic wave detection system and the electrical resistivity detection system reflect the freezing effect based on different detection indicators, thereby achieving bidirectional auxiliary verification of the freezing effect.

[0046] Preferably, the transmission module 12 transmits the results analyzed and processed by the processing module 11 to the data storage module 13 via wireless transmission. The wireless transmission method includes 4G data traffic, LoRa, etc., and is not limited thereto.

[0047] Preferably, the data storage module 13 uses a database deployed on a cloud server or a self-built server to store the data output by the data processing module 11. The stored data includes acquisition time, distance, propagation time, wave speed, elastic modulus, and resistivity.

[0048] Preferably, the visualization module 14 displays the data stored in the data storage module 13 in the form of charts on the front end based on a B / S architecture or a C / S architecture. The freezing effect is corresponding to the magnitude of wave velocity, elastic modulus, and resistivity. The freezing effect is divided into three levels: poor, good, and excellent. Different levels are displayed with different colors. Poor effect is displayed in red, good effect in blue, and excellent effect in green. The corresponding color is modified in real time on the communication channel base map according to the data to visualize the freezing effect, making the freezing effect more intuitive.

[0049] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting the freezing effect throughout the construction process of a connecting passage, characterized in that, include: The acoustic detection system includes a first acoustic transmitter arranged in a first acoustic emission hole on the central axis of the connecting passage, a second acoustic transmitter and a third acoustic transmitter arranged in a second acoustic emission hole and a third acoustic emission hole respectively in the middle of the structure and the freezing pipe, and a first acoustic receiver, a second acoustic receiver, a third acoustic receiver and a fourth acoustic receiver arranged circumferentially along the outer side of the freezing wall. Electrical detection system: includes needle-shaped electrodes respectively set around the communication channel, with the two outer needle-shaped electrodes on each side being current electrodes and the two inner needle-shaped electrodes being voltage electrodes; Data processing system: includes acquisition module, processing module, transmission module, data storage module and visualization display module.

2. The freezing effect detection device for the entire construction process of the connecting passage as described in claim 1, characterized in that, The first acoustic transmitter performs bidirectional transmission and reception during the active freezing period of the connecting passage; the second and third acoustic transmitters are activated during the excavation period of the connecting passage to monitor the state of the frozen wall during the excavation stage.

3. The freezing effect detection device for the entire construction process of the connecting passage as described in claim 1, characterized in that, The first, second, and third acoustic transmitters are all integrated transceiver devices.

4. The freezing effect detection device for the entire construction process of the connecting passage as described in claim 1, characterized in that, The first, second, third, and fourth acoustic receivers are respectively arranged in the first, second, third, and fourth acoustic receiving holes on the outer periphery of the frozen wall. The depth of the first, second, third, and fourth acoustic receiving holes extends to the central axis of the communication channel.

5. The freezing effect detection device for the entire construction process of the connecting passage as described in claim 1, characterized in that, The distance between the needle electrodes is dynamically adjusted according to the thickness of the frozen wall.

6. The freezing effect detection device for the entire construction process of the connecting passage as described in claim 1, characterized in that, The acquisition module acquires and receives detection data from the acoustic wave detection system and the electrical resistivity detection system.

7. The freezing effect detection device for the entire construction process of the connecting passage as described in claim 1, characterized in that, The processing module analyzes and processes the detection data received by the acquisition module, calculates the wave velocity based on the time it takes for the ultrasonic wave to propagate in the frozen soil area of ​​the transceiver, and calculates the resistivity of the frozen soil layer during excavation based on the value measured by the needle electrode.

8. The freezing effect detection device for the entire construction process of the connecting passage as described in claim 1, characterized in that, The transmission module transmits the results analyzed and processed by the processing module to the data storage module via wireless transmission.

9. The freezing effect detection device for the entire construction process of the connecting passage according to claim 1, characterized in that, The data storage module uses a database deployed on a cloud server or a self-built server to store the data output by the data processing module.

10. The freezing effect detection device for the entire construction process of the connecting passage according to claim 1, characterized in that, The visualization module displays the data stored in the data storage module on the front end based on a B / S architecture or a C / S architecture.

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