Tunnel vault void monitoring device and method

Abstract

The invention belongs to the technical field of tunnel lining pouring, and aims to solve the problem that lining vault void defects occur occasionally. The invention provides a tunnel vault void monitoring device and method. The tunnel vault void monitoring device comprises a control box and N strain type pressure sensors, the variable pressure sensor is of a sheet-shaped conductive spring structure, the sheet-shaped conductive spring structure comprises a longitudinal high point and a longitudinal low point, the longitudinal high point is connected with the geotechnical cloth below the tunnel vault, and the longitudinal low point is connected with the waterproof plate below the geotechnical cloth. The strain type pressure sensor obtains plumpness data of vault pouring through voltage change caused by distance change between the longitudinal high point and the longitudinal low point; the N strain type pressure sensors are arranged at intervals in the length direction of the tunnel, the control box is electrically connected with the corresponding N strain type pressure sensors through N sets of detection signal lines, and the control box is connected with a terminal displayer used for displaying plumpness data of vault pouring. The method can effectively prevent cavities from appearing on the tunnel secondary lining concrete vault.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel lining casting, and in particular relates to a tunnel vault void monitoring device and method. Background Art

[0002] As the main load-bearing structure of railway and highway tunnels, the construction quality of the secondary lining of the tunnel plays a vital role in the engineering structure and operational safety of railway and highway tunnels. The lining quality defects, mainly the hollowing of the arch, are related to the harsh construction environment and complex construction technology of railway and highway tunnels, as well as the performance of the lining casting equipment and the construction process management.

[0003] Once defects such as vault voids are formed, subsequent remediation is difficult, costly, and has limited effect. It is difficult to substantially reinforce the lining structure by taking measures such as grouting and filling.

[0004] The secondary lining is poured in the narrow space between the steel formwork and the waterproof board. Due to the visual barrier and signal shielding of the steel formwork, as well as the complex phase changes and flow characteristics of concrete, it is technically difficult to grasp the lining pouring process and quality in real time, comprehensively and accurately, resulting in frequent quality defects such as hollowing of the lining vault. Summary of the invention

[0005] In order to solve at least one of the above technical problems existing in the prior art, the present invention provides a tunnel vault void monitoring device and method.

[0006] The present invention is implemented by the following technical solution: a tunnel vault degassing monitoring device, comprising a control box and N strain type pressure sensors;

[0007] The strain type pressure sensor is a sheet-like conductive spring structure, which includes a longitudinal high point and a longitudinal low point, wherein the longitudinal high point is connected to the geotextile under the tunnel vault, and the longitudinal low point is connected to the waterproof board under the geotextile. The strain type pressure sensor obtains the fullness data of the vault pouring through the voltage change caused by the change in the distance between the longitudinal high point and the longitudinal low point;

[0008] N strain type pressure sensors are arranged at intervals along the length direction of the tunnel. The control box is electrically connected to the corresponding N strain type pressure sensors through N groups of detection signal lines. The control box is connected to a terminal display for displaying the fullness data of the arch crown casting.

[0009] Preferably, the fullness data of the vault casting includes initial gap, casting gap, and grouting gap;

[0010] The initial gap is the initial gap between the waterproof board and the geotextile after the tunnel waterproof board is installed in place and before pouring begins, and is obtained based on the initial distance between the longitudinal high point and the longitudinal low point of the strain gauge pressure sensor;

[0011] The pouring gap is the gap between the waterproof board and the tunnel vault when the concrete pouring is finished, which is obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain gauge pressure sensor at that moment;

[0012] The grouting gap is the gap between the waterproof board and the tunnel vault when the mold grouting is completed, and is obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain gauge pressure sensor at that moment.

[0013] Preferably, the fullness data of the vault casting also includes a first real-time gap and a second real-time gap;

[0014] The first real-time gap refers to: the gap between the waterproof board and the tunnel vault during the period from when the concrete reaches the initial installation position of the waterproof board to when the concrete pouring is completed;

[0015] The second real-time gap refers to: the gap between the waterproof board and the tunnel vault during the period from the start of the strip mold grouting to the end of the strip mold grouting;

[0016] The first real-time gap and the second real-time gap are obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain gauge pressure sensor.

[0017] Preferably, the real-time distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor is obtained by reversely solving the voltage value output by the strain type pressure sensor.

[0018] Preferably, the distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor is in the range of 0-5 cm; the number of the strain type pressure sensors is 12, which are arranged at intervals of 0.8-1.0 m along the tunnel direction.

[0019] Preferably, the control box is integrated with a PLC controller and a power supply inside, and with a warning light, a buzzer and N concrete pouring indicator lights outside; the output ends of the N groups of detection signal lines are connected to the N signal input ends of the PLC controller, the N signal output ends of the PLC controller are correspondingly connected to the N concrete pouring indicator lights, and the N+1th signal output end of the PLC controller is connected to the warning light and the buzzer; the power supply is used to provide power to the components of the control box, and the N+2th signal output end of the PLC controller is connected to the terminal display; the control box is arranged on the tunnel lining trolley.

[0020] Preferably, the N strain type pressure sensors are connected by soft insulating wires to prevent the strain type pressure sensors from being misplaced.

[0021] The present invention also provides a tunnel vault degassing monitoring method, comprising the following steps:

[0022] Install and start the tunnel vault degassing monitoring device to obtain the initial gap between the waterproofing board and the geotextile based on the initial spacing between the longitudinal high point and the longitudinal low point;

[0023] The concrete pouring operation of the secondary lining is started, and the concrete pouring is continued. When the concrete reaches the initial installation position of the waterproof board at the arch position, the concrete squeezes the waterproof board to move toward the position of the geotextile at the arch position, and the first real-time gap in the arch pouring process is continuously obtained based on the change in the spacing between the longitudinal high point and the longitudinal low point;

[0024] When all N concrete pouring indicator lights are on, the warning light and buzzer sound an alarm to remind you to stop pouring concrete. When the concrete is poured in place, the pouring gap for the vault concrete is obtained based on the distance between the longitudinal high point and the longitudinal low point.

[0025] The secondary lining grouting operation starts, and the slurry squeezes the waterproof board toward the position of the geotextile at the arch position. At the same time, the second real-time gap in the grouting process is continuously obtained based on the change in the spacing between the longitudinal high point and the longitudinal low point;

[0026] When the strip-form grouting is finished, the grouting gap of the strip-form grouting is obtained based on the distance between the longitudinal high point and the longitudinal low point.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention can effectively prevent the formation of cavities in the concrete vault of the secondary lining of the tunnel, can improve the lining resistance, effectively reduce costs, prevent excessive pouring and grouting from causing the top of the secondary lining trolley to collapse, and ensure construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the overall structure installation of the present invention;

[0031] Figure 2 It is a connection schematic diagram of the control box of the present invention;

[0032] Figure 3 It is a flow chart of the present invention.

[0033] In the figure: 1-controller; 2-strain type pressure sensor; 3-geotextile; 4-waterproof board; 5-terminal display; 6-warning light; 7-buzzer; 8-concrete pouring indicator light; 9-insulating wire; 10-concrete; 11-tunnel lining trolley; 12-grouting with mold; 13-insulating wire; 14-power switch. DETAILED DESCRIPTION

[0034] In conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0036] The present invention provides an embodiment:

[0037] like Figure 1 , Figure 2 As shown, a tunnel vault degassing monitoring device includes a control box 1 and N strain gauge pressure sensors 2;

[0038] The strain type pressure sensor 2 is a sheet-like conductive spring structure, which includes a longitudinal high point and a longitudinal low point, wherein the longitudinal high point is connected to the geotextile 3 under the tunnel vault, and the longitudinal low point is connected to the waterproof board 4 under the geotextile. The strain type pressure sensor 2 obtains the fullness data of the vault casting through the voltage change caused by the change in the distance between the longitudinal high point and the longitudinal low point;

[0039] N strain type pressure sensors 2 are arranged at intervals along the length direction of the tunnel. The control box 1 is electrically connected to the corresponding N strain type pressure sensors 2 through N groups of detection signal lines 9. The control box 1 is connected to a terminal display 5 for displaying the fullness data of the vault casting. The terminal display 5 intuitively reflects the fullness data of the vault casting with graphics + numerical values, and can also store, query and export casting information.

[0040] In this embodiment, the fullness data of the vault casting includes the initial gap, the casting gap, the grouting gap, the first real-time gap and the second real-time gap:

[0041] The initial gap is the initial gap between the waterproof board 4 and the geotextile 3 after the tunnel waterproof board is installed in place and before pouring begins, and is obtained based on the initial distance between the longitudinal high point and the longitudinal low point of the strain gauge pressure sensor 2;

[0042] The pouring gap is the gap between the waterproof board 4 and the tunnel vault when the concrete pouring is finished, which is obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain gauge pressure sensor 2 at that moment;

[0043] The grouting gap is the gap between the waterproof board 4 and the tunnel vault when the mold grouting is completed, and is obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor 2 at that moment.

[0044] The first real-time gap refers to: the gap between the waterproof board 4 and the tunnel vault during the time period after the concrete reaches the initial installation position of the waterproof board 4 and before the concrete pouring is completed; the second real-time gap refers to: the gap between the waterproof board 4 and the tunnel vault during the time period after the start of the mold grouting and before the end of the mold grouting; the first real-time gap and the second real-time gap are obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor 2.

[0045] The real-time distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor 2 is obtained by reversely solving the voltage value output by the strain type pressure sensor 2. This is the prior art and will not be described in detail. The distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor 2 ranges from 0 to 5 cm; the number of strain type pressure sensors 2 is 12, and they are arranged at intervals of 0.8 to 1.0 m along the tunnel direction.

[0046] The control box 1 is integrated with a PLC controller and a power supply inside, and with a warning light 6, a buzzer 7 and N concrete pouring indicator lights 8 outside; the output ends of the N groups of detection signal lines are connected to the N signal input ends of the PLC controller, and the N signal output ends of the PLC controller are correspondingly connected to the N concrete pouring indicator lights 8, and the N+1 signal output end of the PLC controller is connected to the warning light 6 and the buzzer 7. When all the first real-time gaps are less than the preset threshold, the N+1 signal output end outputs a high level, and the warning light 6 and the buzzer 7 alarm; the power supply is used to provide power to the components of the control box 1, and the N+2 signal output end of the PLC controller is connected to the terminal display 5 to output the fullness data of the vault pouring; the control box 1 is set on the tunnel lining trolley. The N strain gauge pressure sensors 2 are connected by a soft insulating wire 13 to prevent the strain gauge pressure sensors 2 from being misplaced.

[0047] like Figure 3 As shown, the present invention also provides a tunnel vault degassing monitoring method, comprising the following steps:

[0048] S101: Install and start the tunnel vault degassing monitoring device, and obtain the initial gap between the waterproof board 4 and the geotextile 3 based on the initial spacing between the longitudinal high point and the longitudinal low point;

[0049] S102: Starting the concrete pouring operation of the secondary lining, the concrete pouring is continued. When the concrete reaches the initial installation position of the waterproof board 4 at the arch position, the concrete squeezes the waterproof board 4 to move toward the position of the geotextile 3 at the arch position, and the first real-time gap in the arch pouring process is continuously obtained based on the change in the spacing between the longitudinal high point and the longitudinal low point;

[0050] S103: When all N concrete pouring indicator lights 8 are on, the warning light 6 and the buzzer 7 sound an alarm to remind people to stop pouring concrete. When the concrete is poured in place, the pouring gap for the vault concrete is obtained based on the distance between the longitudinal high point and the longitudinal low point.

[0051] S104: Starting the secondary lining grouting operation with a mold, the slurry squeezes the waterproof board 4 to move toward the position of the geotextile 3 at the arch position, and at the same time, the second real-time gap in the grouting process with a mold is continuously obtained based on the change in the spacing between the longitudinal high point and the longitudinal low point;

[0052] S105: When the grouting with mold is finished, the grouting gap of the grouting with mold is obtained based on the distance between the longitudinal high point and the longitudinal low point.

[0053] By comparing the pouring gap with the initial gap, the concrete top pouring condition can be analyzed and the key positions of the formwork grouting can be guided; the grouting effect can be fed back through the pouring gap and the grouting gap.

[0054] If the compression casting result of a certain sensing point has no obvious change from the initial value, the voltage change can also reflect whether the casting is empty. Specifically, if the strain gauge pressure sensor 2 at a certain point is installed after the waterproof board 4 is installed and there is no casting, the initial gap displayed on the terminal display 5 is 0mm, and whether the casting is full can be judged by observing the voltage curve;

[0055] If the output voltage of the strain type pressure sensor 2 at this point is greater than the initial voltage, it indicates that the concrete has been poured in place; if the output voltage of the strain type pressure sensor 2 at this point is equal to or less than the initial voltage, it indicates that the concrete is not poured in place or the waterproof board 4 is detached.

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A tunnel vault degassing monitoring device, characterized in that: It comprises a control box (1) and N strain gauge pressure sensors (2); The strain type pressure sensor (2) is a sheet-shaped conductive spring structure, which includes a longitudinal high point and a longitudinal low point, wherein the longitudinal high point is connected to the geotextile (3) below the tunnel vault, and the longitudinal low point is connected to the waterproof board (4) below the geotextile. The strain type pressure sensor (2) obtains the fullness data of the vault casting through the voltage change caused by the change in the distance between the longitudinal high point and the longitudinal low point; N strain type pressure sensors (2) are arranged at intervals along the length direction of the tunnel, the control box (1) is electrically connected to the corresponding N strain type pressure sensors (2) via N groups of detection signal lines (9), and the control box (1) is connected to a terminal display (5) for displaying fullness data of arch crown casting.

2. A tunnel vault degassing monitoring device according to claim 1, characterized in that: The fullness data of the vault casting includes the initial gap, the casting gap, and the grouting gap; The initial gap is the initial gap between the waterproof board (4) and the geotextile (3) after the tunnel waterproof board is installed in place and before pouring begins, and is obtained based on the initial distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor (2); The pouring gap is the gap between the waterproof board (4) and the tunnel vault when the concrete pouring is finished, and is obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain gauge pressure sensor (2) at that moment; The grouting gap is the gap between the waterproof board (4) and the tunnel vault when the mold grouting is completed, and is obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor (2) at that moment.

3. A tunnel vault degassing monitoring device according to claim 2, characterized in that: The fullness data of the vault casting also includes a first real-time gap and a second real-time gap; The first real-time gap refers to: the gap between the waterproof board (4) and the tunnel vault during the period from when the concrete reaches the initial installation position of the waterproof board (4) to when the concrete pouring is completed; The second real-time gap refers to: the gap between the waterproof board (4) and the tunnel vault during the period after the start of the strip mold grouting and before the end of the strip mold grouting; The first real-time gap and the second real-time gap are obtained based on the real-time distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor (2).

4. A tunnel vault degassing monitoring device according to claim 3, characterized in that: The real-time distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor (2) is obtained by reversely solving the voltage value output by the strain type pressure sensor (2).

5. The tunnel vault degassing monitoring device according to claim 4, characterized in that: The distance between the longitudinal high point and the longitudinal low point of the strain type pressure sensor (2) ranges from 0 to 5 cm; the number of the strain type pressure sensors (2) is 12, which are arranged at intervals of 0.8 to 1.0 m along the tunnel direction.

6. The tunnel vault degassing monitoring device according to claim 1, characterized in that: The control box (1) is internally integrated with a PLC controller and a power supply, and externally integrated with a warning light (6), a buzzer (7) and N concrete pouring indicator lights (8); the output ends of N groups of detection signal lines are connected to N signal input ends of the PLC controller, the N signal output ends of the PLC controller are correspondingly connected to the N concrete pouring indicator lights (8), and the N+1th signal output end of the PLC controller is connected to the warning light (6) and the buzzer (7); the power supply is used to provide power to components of the control box (1), and the N+2th signal output end of the PLC controller is connected to a terminal display (5); the control box (1) is arranged on a tunnel lining trolley.

7. The tunnel vault degassing monitoring device according to claim 6, characterized in that: The N strain type pressure sensors (2) are connected via soft insulating wires (13) to prevent the strain type pressure sensors (2) from being misaligned.

8. A tunnel vault degassing monitoring method, based on the tunnel vault degassing monitoring device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Install and start a tunnel vault degassing monitoring device to obtain an initial gap between the waterproof board (4) and the geotextile (3) based on the initial spacing between the longitudinal high point and the longitudinal low point; The concrete pouring operation of the secondary lining is started, and the concrete pouring is continued. When the concrete reaches the initial installation position of the waterproof board (4) at the arch position, the concrete squeezes the waterproof board (4) to move toward the position of the geotextile (3) at the arch position, and the first real-time gap in the arch pouring process is continuously obtained based on the change in the spacing between the longitudinal high point and the longitudinal low point; When all N concrete pouring indicator lights (8) are on, the warning light (6) and the buzzer (7) sound an alarm to remind people to stop pouring concrete. When the concrete is poured in place, the pouring gap for the vault concrete is obtained based on the distance between the longitudinal high point and the longitudinal low point. The secondary lining grouting operation is started, the slurry squeezes the waterproof board (4) to move toward the position of the geotextile (3) at the arch position, and the second real-time gap in the grouting process is continuously obtained based on the change in the spacing between the longitudinal high point and the longitudinal low point; When the strip-form grouting is finished, the grouting gap of the strip-form grouting is obtained based on the distance between the longitudinal high point and the longitudinal low point.

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