Tunnel steel ring sheet settlement inspection method

Abstract

The invention provides a tunnel steel ring sheet settlement inspection method, which adopts the technical scheme of combining a pre-embedded monitoring device and an automatic inspection system, can remarkably improve the efficiency and accuracy of tunnel steel ring sheet settlement monitoring, not only reduces the dependence on expensive acceleration sensors, but also does not need to be electrified for a long time for a resistance wire in the scheme, thereby reducing the cost. The inspection device can move along the track, rapidly scan the inner wall of the whole tunnel and obtain the state information of each section of steel ring sheet in real time, and the reliability of a measurement result is ensured by a data acquisition mode based on an electromagnetic induction principle. Meanwhile, the data processing flow is simplified, the intelligent level of tunnel maintenance work is effectively improved through the technology, powerful support is provided for guaranteeing the safety of the tunnel steel ring piece structure, and the problems that in steel ring piece settlement monitoring, the sensor maintenance cost is high, and data collection is difficult are solved.

Description

Technical Field

[0001] The invention relates to the field of steel ring piece detection, and in particular to a tunnel steel ring piece settlement inspection method. Background Art

[0002] Tunnel engineering is an important part of modern transportation construction, especially in the development of urban underground space and mountain crossing. With the acceleration of urbanization and the growth of transportation demand, higher requirements are placed on the safety and durability of tunnels. Tunnel structures are in a complex geological environment for a long time and are easily affected by factors such as stratum pressure and groundwater erosion, which leads to structural deformation, settlement and other problems. These problems not only affect the normal use of tunnels, but may even threaten the safety of tunnel structures in serious cases.

[0003] Therefore, it is necessary to install steel rings on the inner wall of the tunnel to reduce the risk of settlement of the tunnel. After the steel rings are installed, it is necessary to regularly monitor the settlement of the sections where the steel rings are installed. Currently, it is necessary to install acceleration sensors at each node of the steel rings. The acceleration sensors must also be powered on regularly, and then the sensor data is collected for analysis to derive the settlement. Acceleration sensors are relatively expensive, and there is no more convenient way to collect data during daily inspections except manual collection. Therefore, a method that is more convenient for data collection during daily inspections is needed. Summary of the invention

[0004] The main purpose of the present invention is to provide a tunnel steel ring segment settlement inspection method, which solves the problems of high sensor maintenance cost and difficult data collection in steel ring segment settlement monitoring.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a tunnel steel ring segment settlement inspection method, the method comprising: S1. Pre-embed monitoring devices on each steel ring and lay the steel rings on the inner wall of the tunnel; S2. Place the inspection device on the tunnel track; S3. Open the arm extension components on both sides of the inspection device; S4, the second sensor on the arm span assembly is aligned with the first sensor; S5, the electric control component energizes the second sensor on one side of the arm span component. S6, the second inductor energizes the first inductor, and the second inductor on the other side receives the current passing through the monitoring device; S7, the electronic control component measures the voltage change, determines whether the steel ring has settled according to the voltage change, and stores the monitoring data; S8. Repeat steps S4-S7 to complete the inspection of each steel ring segment.

[0006] In the preferred embodiment, in step S1, a groove for burying the monitoring device is preset on the steel ring sheet, the monitoring device is buried in the groove, and an insulating coating is provided around the groove to isolate the conductivity between the resistance wire and the steel ring sheet; The monitoring device and the steel ring are filled and bonded with epoxy resin glue.

[0007] In a preferred embodiment, in step S4, the second sensor and the first sensor are electromagnetic induction sensors, the second sensor is connected to a power source to generate a magnetic field, and the first sensor converts the magnetic field into electrical energy.

[0008] In the preferred embodiment, in step S7, when the steel ring piece settles, the resistance wire buried in the groove will be stretched or sheared, and the electronic control component measures the voltage change in the bridge through the Wheatstone bridge principle to determine whether the resistance wire is stretched.

[0009] In the preferred embodiment, the inspection device includes a frame, an electric control component is provided on the frame, and swingable arm span components are arranged on both sides of the electric control component; A vehicle bottom plate is provided below the vehicle frame, a roller is provided below the vehicle bottom plate, and a buffer mechanism is provided between the roller and the vehicle frame; The arm extension component comprises a rotating shaft, a hydraulic seat is arranged on the rotating shaft, a retractable multi-stage hydraulic cylinder is arranged on the hydraulic seat, and a second sensor is arranged on the top of the multi-stage hydraulic cylinder. In the preferred embodiment, arm span supports are provided on both sides above the vehicle bottom plate, the rotating shaft is arranged between the arm span supports, and an electromagnetic damper is also provided between the end of the rotating shaft and the arm span supports.

[0010] In a preferred embodiment, the electric control component includes a power supply, one side of the power supply is connected to a first resistor and a second resistor, the first resistor is connected in parallel with the second resistor, and one end of the first resistor is electrically connected to the second inductor; A third resistor is provided on the other side of the power supply, and one end of the third resistor is electrically connected to the second inductor; A detection circuit is also provided between the second resistor and the third resistor, and an emergency switch and an integrated voltmeter are provided on the detection circuit. The integrated voltmeter is used to detect voltage changes and transmit data information to the memory; The electric control component is also provided with a tightening wheel, which is used to tighten the wire between the second inductor and the power supply.

[0011] In the preferred embodiment, a driving motor is also provided in the frame, and the driving motor is connected to the roller by a chain transmission; Limiting support plates are also provided on both sides of the frame, and the limiting support plates are used to limit the swing angle of the arm span assembly.

[0012] In the preferred embodiment, the buffer mechanism includes a roller frame, the lower part of the roller frame is connected to the roller shaft, a plurality of guide shafts are arranged above the roller frame, and a buffer spring is arranged between the guide shaft and the frame; A hydraulic buffer is also provided between the guide shafts.

[0013] In the preferred embodiment, push supports are provided on both sides of the frame, and push support plates are provided at the front ends of the push supports; Pushing brackets are arranged on both sides of the hydraulic seat, and a pushing hydraulic cylinder is arranged between the pushing brackets and the pushing support plate. The pushing hydraulic cylinder is used to adjust the flipping angle of the multi-stage hydraulic cylinder.

[0014] The present invention provides a tunnel steel ring segment settlement inspection method, which has the following beneficial effects: 1. The technical solution of combining the pre-buried monitoring device with the automatic inspection system can significantly improve the efficiency and accuracy of tunnel steel ring settlement monitoring. It not only reduces the dependence on expensive acceleration sensors, but also the resistance wire in this case does not need to be powered on for a long time, but only needs to be powered on during inspection. It also reduces the cost and workload of manual inspection through automation. 2. The inspection device can move along the track and quickly scan the entire tunnel wall, and obtain the status information of each section of the steel ring in real time. The data acquisition method based on the principle of electromagnetic induction ensures the reliability of the measurement results and simplifies the data processing process. This technology effectively improves the intelligence level of tunnel maintenance work and provides strong support for ensuring the safety of the tunnel steel ring structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the steel ring piece of the present invention; Figure 2 is an axonometric view of the inspection device of the present invention; Figure 3 It is a schematic diagram of the layout of the inspection device of the present invention; Figure 4 It is a schematic diagram of the layout of the steel ring pieces of the present invention; Figure 5 It is a schematic diagram of a Wheatstone bridge circuit of the present invention; Figure 6 Schematic diagram of shearing of the resistance wire of the present invention; Figure 7 is a corresponding schematic diagram of the first sensor and the second sensor of the present invention; Figure 8 is a bottom isometric view of the inspection device of the present invention; Fig. 9 is a cross-sectional view of the buffer mechanism of the present invention; Fig.10It is a structural schematic diagram of the tensioning wheel of the present invention; Fig.11 is a schematic diagram of the arm span assembly of the present invention being folded; Fig.12 It is a partial view of the arm span assembly of the present invention.

[0016] In the figure: steel ring 1; monitoring device 2; resistance wire 201; first sensor 202; inspection device 3; frame 4; roller 401; vehicle bottom plate 402; arm support 403; push support 404; buffer mechanism 405; drive motor 406; roller frame 407; guide shaft 408; hydraulic buffer 409; electronic control component 5; power supply 501; first resistor 502; second resistor 503; third resistor 504; integrated voltmeter 505; emergency switch 506; take-up wheel 507; arm assembly 6; rotating shaft 601; push bracket 602; hydraulic seat 603; multi-stage hydraulic cylinder 604; second sensor 605; push hydraulic cylinder 606; push support plate 607; limit support plate 608. DETAILED DESCRIPTION

[0017] Example 1 like Figure 1-12 As shown, a tunnel steel ring segment settlement inspection method, the method comprising: S1, embed a monitoring device 2 on each steel ring 1, and lay the steel ring 1 on the inner wall of the tunnel; S2, placing the inspection device 3 on the tunnel track; S3, open the arm extension components 6 on both sides of the inspection device 3, start the push hydraulic cylinder 606 to pull the rotating shaft 601, pull the multi-stage hydraulic cylinder 604 to a horizontal state, and make the second sensor 605 at the top of the multi-stage hydraulic cylinder 604 unfold horizontally; S4, the second sensor 605 on the arm span assembly 6 is aligned with the first sensor 202; S5, the electric control component 5 energizes the second sensor 605 on one side of the arm span component 6, S6, the second inductor 605 energizes the first inductor 202, and the second inductor 605 on the other side receives the current passing through the monitoring device 2, a transmitting coil is provided on one side of the second inductor 605, and a receiving coil is provided on the other side, the first inductor 202 is provided at both ends of the resistance wire 201, a transmitting coil is provided on one side of the first inductor 202, and a receiving coil is provided on the other side, a transmitting coil is provided on one side of the second inductor 605 corresponding to the receiving coil on the first inductor 202, and a receiving coil on one side of the second inductor 605 corresponds to the transmitting coil provided on the first inductor 202, forming a loop; S7, the electric control component 5 measures the voltage change, determines whether the steel ring piece 1 has settled according to the voltage change, and stores the monitoring data; S8. Repeat steps S4-S7 to complete the inspection of each steel ring segment.

[0018] In the preferred embodiment, in step S1, a groove for burying the monitoring device 2 is preset on the steel ring piece 1, and the monitoring device 2 is buried in the groove. An insulating coating is provided around the groove to isolate the conductivity between the resistance wire 201 and the steel ring piece; The monitoring device 2 and the steel ring piece 1 are filled and bonded with epoxy resin glue.

[0019] In a preferred embodiment, in step S4, the second inductor 605 and the first inductor 202 are electromagnetic induction sensors, the second inductor 605 is connected to the power supply 501 to generate a magnetic field, and the first inductor 202 converts the magnetic field into electrical energy.

[0020] In the preferred embodiment, in step S7, when the steel ring piece 1 settles, the resistance wire 201 buried in the groove will be stretched or sheared, and the electronic control component 5 measures the voltage change in the bridge through the Wheatstone bridge principle to determine whether the resistance wire 201 is stretched.

[0021] A Wheatstone bridge circuit consists of the following components: Power supply 501: provides power for the entire circuit; A first resistor 502 and a second resistor 503: the two resistors are connected in parallel, and one end of the first resistor is connected to the second inductor 605; The third resistor 504: one end of this resistor is also connected to the second inductor 605; Detection circuit: including emergency switch 506 and integrated voltmeter 505, used to monitor and record voltage changes; Resistance wire 201: as the resistance to be measured, pre-buried in the groove of the steel ring sheet 1; When the steel ring plate settles, the resistance wire 201 embedded inside it may be stretched or sheared, causing its resistance value to change. At this time, the power supply 501 in the electric control component 5 supplies power to form a complete bridge circuit. If the resistance of the resistance wire 201 changes, the bridge will no longer be balanced, and a voltage difference will be generated on one diagonal of the bridge, which can be measured by the integrated voltmeter 505; Specifically, in the absence of settlement, it is assumed that the first resistor 502, the second resistor 503 and the third resistor 504 are all known standard resistors, and the bridge formed by them and the resistance wire 201 is balanced, that is, the voltages on both sides are equal. Once the resistance wire 201 is deformed due to settlement, its resistance value changes, destroying the original balance state, and a measurable voltage difference will be generated at both ends of the diagonal of the bridge. By analyzing this voltage change, the settlement of the steel ring piece can be inferred; There are four resistors: R1, R2, R3 and Rx (the resistor to be measured), as well as a power supply V and a detection instrument (usually a voltmeter or an ammeter).

[0022] R1 / R2=Rx / R3 definition: R1 = first resistor 502 R2 = Second resistor 503 R3 = the third resistor 504 Rx = resistance wire 201 When the steel ring does not settle, the resistance value of the resistor (Rx) is known and the bridge is in a balanced state. At this time, the voltages at both ends are equal, that is: V AB =V CD A, B, C and D represent the four nodes of the bridge.

[0023] If the steel ring sinks, the resistance of the resistor (Rx) changes. Assuming the changed resistance is Rx', the bridge will lose balance. At this time, a voltage difference ΔV will be generated on the diagonal AC. This voltage difference can be measured by the integrated voltmeter 505. According to Kirchhoff's voltage law, we can get: Ideally, when the bridge is balanced, that is, when there is no voltage difference across the detection instrument, the following conditions are met: V AC =V AB -V BC Since V AB is a constant voltage provided by the power supply, and V BC Affected by Rx, so ΔV = V AC will not be zero, and a measurable voltage difference will be generated at both ends of the diagonal of the bridge. By analyzing this voltage change, the settlement of the steel ring can be inferred; In the preferred embodiment, the inspection device 3 includes a frame 4, on which an electric control component 5 is disposed, and on both sides of the electric control component 5, swingable arm span components 6 are disposed; A vehicle bottom plate 402 is provided below the vehicle frame 4, a roller 401 is provided below the vehicle bottom plate 402, and a buffer mechanism 405 is provided between the roller 401 and the vehicle frame 4; The arm span assembly 6 includes a rotating shaft 601 , on which a hydraulic seat 603 is disposed, on which a retractable multi-stage hydraulic cylinder 604 is disposed, and at the top of the multi-stage hydraulic cylinder 604 a second sensor 605 is disposed. In the preferred embodiment, arm supports 403 are provided on both sides above the vehicle bottom plate 402 , the rotating shaft 601 is arranged between the arm supports 403 , and an electromagnetic damper is also provided between the end of the rotating shaft 601 and the arm supports 403 .

[0024] In the preferred embodiment, the electric control component 5 includes a power supply 501, one side of the power supply 501 is connected to a first resistor 502 and a second resistor 503, the first resistor 502 and the second resistor 503 are connected in parallel, and one end of the first resistor 502 is electrically connected to the second inductor 605; A third resistor 504 is disposed on the other side of the power source 501 , and one end of the third resistor 504 is electrically connected to the second inductor 605 ; A detection circuit is also provided between the second resistor 503 and the third resistor 504. The detection circuit is provided with an emergency switch 506 and an integrated voltmeter 505. The integrated voltmeter 505 is used to detect voltage changes and transmit data information to the memory. A tightening wheel 507 is also provided in the electric control component 5, and the tightening wheel 507 is used to tighten the wire between the second sensor 605 and the power supply.

[0025] In the preferred embodiment, the frame 4 is further provided with a driving motor 406, and the driving motor 406 is connected to the roller 401 via a chain transmission; Limiting support plates 608 are also provided on both sides of the frame 4 , and the limiting support plates 608 are used to limit the swing angle of the arm span assembly 6 .

[0026] In the preferred embodiment, the buffer mechanism 405 includes a roller frame 407, the lower part of the roller frame 407 is connected to the roller shaft, a plurality of guide shafts 408 are provided on the upper part of the roller frame 407, and a buffer spring is provided between the guide shaft 408 and the frame 4; A hydraulic buffer 409 is also provided between the guide shafts 408 .

[0027] In the preferred embodiment, push supports 403 are provided on both sides of the frame 4, and a push support plate 607 is provided at the front end of the push support 403; A pushing bracket 602 is provided on both sides of the hydraulic seat 603 , and a pushing hydraulic cylinder 606 is provided between the pushing bracket 602 and the pushing support plate 607 . The pushing hydraulic cylinder 606 is used to adjust the flip angle of the multi-stage hydraulic cylinder 604 . The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A tunnel steel ring segment settlement inspection method, characterized by: The method includes: S1. Pre-embed a monitoring device (2) on each steel ring (1), and lay the steel ring (1) on the inner wall of the tunnel; S2, placing the inspection device (3) on the tunnel track; S3, opening the arm extension components (6) on both sides of the inspection device (3); S4, the second sensor (605) on the arm span assembly (6) is aligned with the first sensor (202); S5, the electric control component (5) energizes the second sensor (605) on one side of the arm span component (6), S6. The second inductor (605) energizes the first inductor (202), and the second inductor (605) on the other side receives the current passing through the monitoring device (2); S7, the electric control component (5) measures the voltage change, determines whether the steel ring (1) has settled according to the voltage change, and stores the monitoring data; S8. Repeat steps S4-S7 to complete the inspection of each steel ring segment.

2. According to claim 1, a tunnel steel ring segment settlement inspection method is characterized by: In step S1, a groove for burying the monitoring device (2) is preset on the steel ring piece (1), the monitoring device (2) is buried in the groove, and an insulating coating is provided around the groove to isolate the electrical conductivity between the resistance wire (201) and the steel ring piece; The monitoring device (2) and the steel ring piece (1) are filled and bonded with epoxy resin glue.

3. According to claim 1, a tunnel steel ring segment settlement inspection method is characterized by: In step S4, the second sensor (605) and the first sensor (202) are electromagnetic induction sensors. The second sensor (605) is connected to the power supply (501) to generate a magnetic field, and the first sensor (202) converts the magnetic field into electrical energy.

4. According to claim 1, a tunnel steel ring segment settlement inspection method is characterized by: In step S7, when the steel ring piece (1) sinks, the resistance wire (201) buried in the groove is stretched or sheared, and the electric control component (5) measures the voltage change in the bridge through the Wheatstone bridge principle, thereby determining whether the resistance wire (201) is stretched.

5. According to claim 1, a tunnel steel ring segment settlement inspection method is characterized by: The inspection device (3) comprises a vehicle frame (4), an electric control component (5) is provided on the vehicle frame (4), and swingable arm span components (6) are arranged on both sides of the electric control component (5); A vehicle bottom plate (402) is provided below the vehicle frame (4), a roller (401) is provided below the vehicle bottom plate (402), and a buffer mechanism (405) is provided between the roller (401) and the vehicle frame (4); The arm span assembly (6) comprises a rotating shaft (601), a hydraulic seat (603) is provided on the rotating shaft (601), a retractable multi-stage hydraulic cylinder (604) is provided on the hydraulic seat (603), and a second sensor (605) is provided at the top end of the multi-stage hydraulic cylinder (604).

6. A tunnel steel ring segment settlement inspection method according to claim 5, characterized in that: Arm support seats (403) are provided on both sides above the vehicle bottom plate (402), the rotating shaft (601) is arranged between the arm support seats (403), and an electromagnetic damper is also provided between the end of the rotating shaft (601) and the arm support seats (403).

7. According to claim 5, a tunnel steel ring segment settlement inspection method is characterized by: The component (5) comprises a power supply (501), one side of the power supply (501) is connected to a first resistor (502) and a second resistor (503), the first resistor (502) and the second resistor (503) are connected in parallel, and one end of the first resistor (502) is electrically connected to a second inductor (605); A third resistor (504) is provided on the other side of the power source (501), and one end of the third resistor (504) is electrically connected to the second inductor (605); A detection circuit is also provided between the second resistor (503) and the third resistor (504), and an emergency switch (506) and an integrated voltmeter (505) are provided on the detection circuit. The integrated voltmeter (505) is used to detect voltage changes and transmit data information to the memory; A tightening wheel (507) is also provided in the electric control component (5), and the tightening wheel (507) is used to tighten the wire between the second sensor (605) and the power source.

8. A tunnel steel ring segment settlement inspection method according to claim 5, characterized in that: A driving motor (406) is also provided in the vehicle frame (4), and the driving motor (406) is connected to the roller (401) via a chain transmission; Limiting support plates (608) are also provided on both sides of the vehicle frame (4), and the limiting support plates (608) are used to limit the swing angle of the arm span assembly (6).

9. A tunnel steel ring segment settlement inspection method according to claim 8, characterized in that: The buffer mechanism (405) comprises a roller frame (407), the lower part of the roller frame (407) is connected to the roller shaft, a plurality of guide shafts (408) are arranged on the upper part of the roller frame (407), and a buffer spring is arranged between the guide shafts (408) and the vehicle frame (4); A hydraulic buffer (409) is also provided between the guide shafts (408).

10. A tunnel steel ring segment settlement inspection method according to claim 5, characterized in that: Pushing supports (403) are also provided on both sides of the vehicle frame (4), and a pushing support plate (607) is provided at the front end of the pushing supports (403); Pushing brackets (602) are provided on both sides of the hydraulic seat (603), and a pushing hydraulic cylinder (606) is provided between the pushing bracket (602) and the pushing support plate (607). The pushing hydraulic cylinder (606) is used to adjust the turning angle of the multi-stage hydraulic cylinder (604).

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