A calibration device for a tunnel surrounding rock deformation monitoring system

Abstract

The utility model relates to a tunnel construction technical field, concretely relates to a kind of calibration device for tunnel surrounding rock deformation monitoring system, including positioning base plate, the inside of positioning base plate is equipped with vacuum adsorption cavity, the top of positioning base plate and located the outside of vacuum adsorption cavity is equipped with multiple groups of adsorption hole, the front surface of positioning base plate is connected with vacuum joint, the rear end fixedly connected with abutment plate in the top of positioning base plate, the left and right ends of abutment plate are slidably connected with moving plate, the utility model is fixed by design without needing to open slot to calibration block, vacuum adsorption is replaced mechanical pressure, eliminates micro-motion wear, in the humid environment of tunnel, there is no metal contact corrosion risk, avoid the damage and corrosion problem that appear in the rigid fixation of traditional calibration block by slotting, while guarantee the fixed effect to calibration block, to further improve the service life of calibration block.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and specifically to a calibration device for a tunnel surrounding rock deformation monitoring system. Background Technology

[0002] During construction or operation, tunnels and urban subways may experience deformation of their cross-sections due to external forces. This deformation reduces the safety, reliability, and stability of the tunnel structure and may even threaten the safety of train operation. Therefore, real-time monitoring of this deformation is of great significance for tunnel safety monitoring.

[0003] A search revealed that CN222598809U discloses a calibration device for a tunnel surrounding rock deformation monitoring system, comprising: a calibration fixture, the calibration fixture including a fixture base plate and two cam assemblies, the fixture base plate having two through holes penetrating the fixture base plate, each cam assembly being inserted into the corresponding through hole; and a calibration block, the cam assemblies being rotatably connected to the fixture base plate to allow the calibration block to be detachably fixed between the cam assemblies and the fixture base plate.

[0004] When using the aforementioned calibration device, the calibration block is fixed by the cam assembly and the clamp base plate, and then the entire calibration device is installed on the inner wall of the tunnel. This calibration device can be used to calibrate and verify the tunnel surrounding rock deformation monitoring system, ensuring the accuracy of the monitoring data when the tunnel surrounding rock deformation monitoring system monitors tunnel deformation. However, since the calibration block needs to be slotted to fit the cam assembly and is rigidly fixed, the edge of the slot is squeezed by the cam during fixing, resulting in excessive local stress and microcracks. Under dynamic load, the cracks propagate, leading to a sharp increase in the risk of fracture. At the same time, the humid environment of the tunnel makes the inner wall of the slot prone to corrosion. The coupling of rust expansion stress and mechanical stress accelerates structural deterioration, thereby reducing the service life of the calibration block.

[0005] Therefore, it is of great importance to design a calibration device for tunnel surrounding rock deformation monitoring systems to address the aforementioned shortcomings. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model designs a calibration device for a tunnel surrounding rock deformation monitoring system. This calibration device aims to solve the technical problems of existing calibration devices, such as increased risk of fracture due to stress concentration caused by the rigid fixing of the calibration block with slots, and the easy corrosion of the inner wall of the calibration block slots in humid environments, which reduces the service life of the calibration block.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A calibration device for a tunnel surrounding rock deformation monitoring system includes a positioning base plate, a vacuum adsorption cavity inside the positioning base plate, multiple adsorption holes on the top of the positioning base plate and outside the vacuum adsorption cavity, a vacuum connector threaded to the front of the positioning base plate, an abutment plate fixedly connected to the rear end of the top of the positioning base plate, movable plates slidably connected to both ends of the abutment plate, positioning side plates fixedly installed at the ends of the two sets of movable plates that are far apart, a driving mechanism installed inside the abutment plate and between the two sets of movable plates, and a calibration block clamped between the two sets of positioning side plates.

[0009] The driving mechanism includes two sets of transmission gears slidably connected inside the abutment plate. One end of each of the two sets of moving plates is fixedly connected to the transmission gear. A synchronous gear is rotatably connected to the middle of the abutment plate, and both sets of transmission gears mesh with the synchronous gear. The synchronous gear is rotatably connected to the abutment plate through a connecting shaft. A drive shaft is rotatably connected to the back of the abutment plate. A drive gear is fixedly installed at the bottom end of the drive shaft, and the rear end of the drive shaft meshes with the drive gear through a transmission gear.

[0010] As a preferred embodiment of this utility model, guide rails are fixedly installed inside the abutment plate and on the inner side of the two sets of transmission racks, and guide wheels are rotatably connected to both ends of the two sets of transmission racks and on the inner side of the guide rails.

[0011] As a preferred embodiment of this utility model, the top end of the drive shaft is rotatably connected to the abutment plate via a connector, and an operation knob is fixedly connected to the top end of the drive shaft.

[0012] As a preferred embodiment of this utility model, a protective cover is fixedly installed on the back of the abutment plate and outside the drive shaft. A locking knob is threaded inside the protective cover, and the locking knob abuts against the drive shaft.

[0013] As a preferred embodiment of this utility model, the rear end of the vacuum connector is threadedly connected to the positioning base plate via a threaded connector, and two sets of first rubber sealing rings are sleeved on the outer side of the threaded connector. The vacuum connector is equipped with a one-way valve and an exhaust valve, and a second rubber sealing ring is sleeved on the outer side of the front end of the vacuum connector.

[0014] As a preferred embodiment of this utility model, a first rubber protective plate is fixedly connected to the front of the abutment plate, and a second rubber protective plate is fixedly connected to the opposite side of each of the two sets of positioning side plates.

[0015] As a preferred embodiment of this utility model, a stabilizing slider is fixedly connected to the front end of the bottom of both sets of positioning side plates, and both sets of stabilizing sliders are slidably connected to the positioning base plate through a sliding groove.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. In this utility model, through the coordinated design of the positioning base plate, adsorption holes and vacuum connector, the vacuum connector is connected to an external vacuum source such as an air compressor. Under the action of vacuum suction, the bottom of the calibration block is further adsorbed and fixed through multiple sets of adsorption holes. The vacuum connector is connected to the positioning base plate through a threaded connector. During installation, two sets of first rubber sealing rings are pre-installed on the outside of the threaded connector, and then screwed into the threaded holes of the positioning base plate to form a pressure seal. The one-way valve automatically closes when vacuuming to ensure that the adsorption force is maintained. The exhaust valve is used to release the vacuum quickly when calibrating the block. The second rubber sealing ring at the front end provides a secondary seal when connecting to the vacuum source equipment to achieve stable adsorption function. Vacuum adsorption replaces mechanical pressing, eliminates fretting wear, and avoids the problems of damage and corrosion that occur when the calibration block is rigidly fixed by slotting, thereby improving the service life of the calibration block.

[0018] 2. In this utility model, through the coordinated design of the abutment plate, the moving plate, the positioning side plate, and the driving mechanism, the calibration block is stably placed on the positioning base plate, ensuring that the back of the calibration block is tightly against the abutment plate. Then, the drive shaft rotates the drive gear, which drives the connecting shaft to rotate under the transmission gear. Subsequently, under the transmission of the synchronous gear, the two sets of transmission racks move synchronously inside the abutment plate, so that the two sets of moving plates move synchronously until the two sets of positioning side plates center and position the calibration block. After the calibration block is clamped and positioned, the first rubber protective plate and the second rubber protective plate absorb the external impact energy, avoiding scratches or deformation caused by direct collision between the calibration block and the plate. At the same time, the flexible contact surface protects the surface integrity of the calibration block, further improving the service life of the calibration block. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the top structure of the positioning base plate of this utility model;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a schematic diagram of the vacuum connector structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the back structure of the abutment plate of this utility model;

[0024] Figure 6 This is a schematic diagram of the drive mechanism structure of this utility model.

[0025] In the diagram: 1. Positioning base plate; 2. Adsorption hole; 3. Vacuum connector; 301. Threaded connector; 302. First rubber sealing ring; 303. One-way valve; 304. Exhaust valve; 305. Second rubber sealing ring; 4. Abutment plate; 401. First rubber protective plate; 5. Moving plate; 6. Positioning side plate; 601. Second rubber protective plate; 602. Stabilizing slider; 603. Slide groove; 7. Drive mechanism; 701. Transmission rack; 702. Synchronous gear; 703. Connecting shaft; 704. Drive shaft; 705. Drive gear; 706. Transmission gear; 707. Guide rail; 708. Guide wheel; 709. Connector; 710. Operating knob; 711. Protective cover; 712. Locking knob; 8. Calibration block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0027] Example: Please refer to Figures 1-6 This utility model provides a technical solution:

[0028] A calibration device for a tunnel surrounding rock deformation monitoring system includes a positioning base plate 1. The positioning base plate 1 has a vacuum adsorption cavity inside. Multiple adsorption holes 2 are formed on the top of the positioning base plate 1 and outside the vacuum adsorption cavity. A vacuum connector 3 is threaded to the front of the positioning base plate 1. An abutment plate 4 is fixedly connected to the rear end of the top of the positioning base plate 1. Movable plates 5 are slidably connected to both ends of the abutment plate 4. Positioning side plates 6 are fixedly installed at the ends of the two sets of movable plates 5 that are far apart. A drive mechanism 7 is installed inside the abutment plate 4 and between the two sets of movable plates 5. A calibration block 8 is clamped between the two sets of positioning side plates 6.

[0029] First, in this embodiment, the specific mechanism of the drive mechanism 7 is as follows:

[0030] The drive mechanism 7 includes two sets of transmission racks 701 slidably connected inside the abutment plate 4. The opposite ends of the two sets of moving plates 5 are fixedly connected to the transmission racks 701. A synchronous gear 702 is rotatably connected to the middle of the abutment plate 4, and both sets of transmission racks 701 mesh with the synchronous gear 702. The synchronous gear 702 is rotatably connected to the abutment plate 4 via a connecting shaft 703. A drive shaft 704 is rotatably connected to the back of the abutment plate 4. A drive gear 705 is fixedly installed at the bottom of the drive shaft 704. The rear end of the drive shaft 704 meshes with the drive gear 705 via a transmission gear 706. The top end of the drive shaft 704 is rotatably connected to the abutment plate 4 via a connector 709. An operating knob 710 is fixedly connected to the top end of the drive shaft 704. The calibration block 8 is placed stably on the positioning base plate 1, ensuring that the back of the calibration block 8 tightly abuts against the abutment plate 4. Then, the drive shaft... 704 rotates the drive gear 705, which, under the transmission of the transmission gear 706, drives the connecting shaft 703 to rotate. Subsequently, under the transmission of the synchronous gear 702, it synchronously drives the two sets of transmission racks 701 to move inside the abutment plate 4, so that the two sets of moving plates 5 move synchronously until the two sets of positioning side plates 6 are centered and positioned on the calibration block 8. Then, the vacuum connector 3 is connected to an external vacuum source, such as an air compressor. Under the action of vacuum suction, the bottom of the calibration block 8 is further adsorbed and fixed through multiple sets of adsorption holes 2. Thus, it is possible to fix the calibration block 8 without opening a slot. Vacuum adsorption replaces mechanical pressing, eliminating fretting wear. In the humid environment of the tunnel, there is no risk of metal contact corrosion. It avoids the damage and corrosion problems that occur when the calibration block 8 is rigidly fixed by slotting. At the same time, it ensures the fixing effect of the calibration block 8, thereby improving the service life of the calibration block 8.

[0031] Furthermore, guide rails 707 are fixedly installed inside the abutment plate 4 and on the inner side of the two sets of transmission racks 701. Guide wheels 708 are rotatably connected to both ends of the two sets of transmission racks 701 and on the inner side of the guide rails 707. When the two sets of transmission racks 701 are moved, the guide wheels 708 roll inside the guide rails 707, thereby improving the movement stability of the transmission racks 701, and thus allowing the positioning side plate 6 to stably clamp and position the calibration block 8.

[0032] Then, a protective cover 711 is fixedly installed on the back of the abutment plate 4 and on the outside of the drive shaft 704. The internal thread of the protective cover 711 is connected to a locking knob 712, and the locking knob 712 abuts against the drive shaft 704. The protective cover 711 completely covers the drive shaft 704 and the outside of the gear, effectively isolating environmental pollutants such as dust and moisture, and extending the service life of the drive mechanism 7. After the positioning side plate 6 clamps and positions the calibrated block 8, the locking knob 712 is tightened to abut against the drive shaft 704 to prevent it from rotating, further ensuring the stability of the calibrated block 8 after positioning.

[0033] Furthermore, the rear end of the vacuum connector 3 is threadedly connected to the positioning base plate 1 via a threaded connector 301. Two sets of first rubber sealing rings 302 are fitted on the outer side of the threaded connector 301. The vacuum connector 3 is equipped with a one-way valve 303 and an exhaust valve 304. The outer side of the front end of the vacuum connector 3 is fitted with a second rubber sealing ring 305. The vacuum connector 3 is connected to the positioning base plate 1 via the threaded connector 301. During installation, the two sets of first rubber sealing rings 302 are pre-installed on the outer side of the threaded connector 301, and then screwed into the threaded hole of the positioning base plate 1 to form a pressure seal. The one-way valve 303 automatically closes during vacuuming to ensure that the adsorption force is maintained. The exhaust valve 304 is used to release the vacuum quickly when aligning with the calibration metering block 8. The second rubber sealing ring 305 at the front end provides a secondary seal when docking with the vacuum source equipment to achieve stable adsorption function.

[0034] Secondly, a first rubber protective plate 401 is fixedly connected to the front of the abutment plate 4, and a second rubber protective plate 601 is fixedly connected to the opposite side of the two sets of positioning side plates 6. After the calibration block 8 is clamped and positioned, the first rubber protective plate 401 and the second rubber protective plate 601 absorb the external impact energy, avoiding scratches or deformation caused by direct collision between the calibration block 8 and the plate. At the same time, the flexible contact surface protects the surface integrity of the calibration block 8, further improving the service life of the calibration block 8.

[0035] Furthermore, each of the two sets of positioning side plates 6 has a fixedly connected stabilizing slider 602 at its front end. Both sets of stabilizing sliders 602 are slidably connected to the positioning base plate 1 through the slide groove 603. When the positioning side plate 6 is used to clamp and position the calibration block 8, the stabilizing slider 602 slides inside the slide groove 603, thereby ensuring the movement stability of the positioning side plate 6.

[0036] Finally, after the calibration block 8 is positioned and fixed, the calibration device is fixed on the inner wall of the tunnel, and calibration blocks 8 of different heights are used to simulate different degrees of deformation of the inner wall of the tunnel. At the same time, the tunnel surrounding rock deformation monitoring system is used to monitor the tunnel after the calibration device is installed, and the deformation monitoring results are obtained. The deformation monitoring results are compared with the actual height of the calibration block 8 in the calibration device to determine the accuracy of the deformation monitoring results. If the error between the two is within the specified error range, the calibration is completed. If the error between the two exceeds the specified error range, the tunnel surrounding rock deformation monitoring system needs to be calibrated until it meets the specified error range.

[0037] In this embodiment, the specific implementation scenario is as follows: The calibration block 8 is placed stably on the positioning base plate 1, ensuring that the back of the calibration block 8 is tightly pressed against the abutment plate 4. Then, the drive shaft 704 rotates the drive gear 705, which in turn drives the connecting shaft 703 to rotate under the transmission gear 706. Subsequently, under the transmission of the synchronous gear 702, the two sets of transmission racks 701 move synchronously inside the abutment plate 4, causing the two sets of moving plates 5 to move synchronously until the two sets of positioning side plates 6 center the calibration block 8. After clamping and positioning the calibration block 8, the first rubber protective plate 401 and the second rubber protective plate 601 absorb external impact energy, preventing scratches or deformation caused by direct collision between the calibration block 8 and the plate. Simultaneously, the flexible contact surface protects the surface integrity of the calibration block 8. Then, the vacuum connector 3 is connected to an external vacuum source, such as an air compressor. Under the action of vacuum suction, the bottom of the calibration block 8 is further cleaned through multiple sets of suction holes 2. For adsorption and fixation, the vacuum connector 3 is connected to the positioning base plate 1 via the threaded connector 301. During installation, two sets of first rubber sealing rings 302 are pre-installed on the outside of the threaded connector 301, and then screwed into the threaded hole of the positioning base plate 1 to form a pressure seal. The one-way valve 303 automatically closes during vacuuming to ensure that the adsorption force is maintained. The exhaust valve 304 is used to release the vacuum quickly when the calibration metering block 8 is released. The front second rubber sealing ring 305 provides a secondary seal when docking with the vacuum source equipment to achieve stable adsorption function. The entire operation process is simple and convenient. This utility model achieves fixation without opening a slot in the calibration metering block 8. It uses vacuum adsorption to replace mechanical pressing, eliminates fretting wear, and eliminates the risk of metal contact corrosion in the humid environment of the tunnel. It avoids the problems of damage and corrosion that occur when the calibration metering block 8 is rigidly fixed by slotting, while ensuring the fixing effect of the calibration metering block 8, thereby improving the service life of the calibration metering block 8.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A calibration device for a tunnel surrounding rock deformation monitoring system, comprising a positioning base plate (1), characterized in that: The positioning base plate (1) has a vacuum adsorption cavity inside. Multiple adsorption holes (2) are opened on the top of the positioning base plate (1) and outside the vacuum adsorption cavity. A vacuum connector (3) is threaded to the front of the positioning base plate (1). An abutment plate (4) is fixedly connected to the rear end of the top of the positioning base plate (1). Moving plates (5) are slidably connected to both ends of the abutment plate (4). Positioning side plates (6) are fixedly installed at the ends of the two sets of moving plates (5) that are far apart. A driving mechanism (7) is installed inside the abutment plate (4) and between the two sets of moving plates (5). A calibration block (8) is clamped between the two sets of positioning side plates (6). The drive mechanism (7) includes two sets of transmission racks (701) slidably connected inside the abutment plate (4). The opposite ends of the two sets of moving plates (5) are fixedly connected to the transmission racks (701). A synchronous gear (702) is rotatably connected to the middle of the abutment plate (4), and both sets of transmission racks (701) mesh with the synchronous gear (702). The synchronous gear (702) is rotatably connected to the abutment plate (4) through a connecting shaft (703). A drive shaft (704) is rotatably connected to the back of the abutment plate (4). A drive gear (705) is fixedly installed at the bottom end of the drive shaft (704). The rear end of the drive shaft (704) meshes with the drive gear (705) through a transmission gear (706).

2. The calibration device for a tunnel surrounding rock deformation monitoring system according to claim 1, characterized in that: The abutment plate (4) is fixedly installed with guide rails (707) inside and on the inner side of the two sets of transmission racks (701). The two ends of the two sets of transmission racks (701) are rotatably connected with guide wheels (708) on the inner side of the guide rails (707).

3. The calibration device for a tunnel surrounding rock deformation monitoring system according to claim 1, characterized in that: The top end of the drive shaft (704) is rotatably connected to the abutment plate (4) via a connector (709), and an operation knob (710) is fixedly connected to the top end of the drive shaft (704).

4. The calibration device for a tunnel surrounding rock deformation monitoring system according to claim 1, characterized in that: A protective cover (711) is fixedly installed on the back of the abutment plate (4) and on the outside of the drive shaft (704). A locking knob (712) is threaded inside the protective cover (711) and abuts against the drive shaft (704).

5. A calibration device for a tunnel surrounding rock deformation monitoring system according to claim 1, characterized in that: The rear end of the vacuum connector (3) is threadedly connected to the positioning base plate (1) via a threaded connector (301). Two sets of first rubber sealing rings (302) are sleeved on the outer side of the threaded connector (301). The vacuum connector (3) is equipped with a one-way valve (303) and an exhaust valve (304). The front end of the vacuum connector (3) is sleeved on the outer side of a second rubber sealing ring (305).

6. A calibration device for a tunnel surrounding rock deformation monitoring system according to claim 1, characterized in that: The front of the abutment plate (4) is fixedly connected to a first rubber protective plate (401), and the two sets of positioning side plates (6) are fixedly connected to a second rubber protective plate (601) on opposite sides.

7. A calibration device for a tunnel surrounding rock deformation monitoring system according to claim 1, characterized in that: Both sets of positioning side plates (6) have a fixed front end of a stabilizing slider (602) at the bottom. Both sets of stabilizing sliders (602) are slidably connected to the positioning base plate (1) through a sliding groove (603).

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