A rapid detector for thickness of sprayed concrete of initial support of plateau tunnel

Abstract

The utility model discloses a kind of highland tunnel primary support spray concrete thickness rapid detector, including probe rod, tooth slot, gear and encoder.The highland tunnel primary support spray concrete thickness rapid detector, probe rod is slidably connected with conduit and extends, the outside of conduit is connected with cover sleeve, cover sleeve is sleeved in the lower end outside of probe rod, tooth slot is set up on probe rod, the outside of tooth slot is equipped with gear transmission, gear is rotatably installed with circular shell, gear is fixedly connected in encoder, encoder is fixedly installed with circular shell, mobile power supply and main control board are fixedly installed in the inside of circular shell, detector adopts circular shell, barrel, conduit and probe rod etc. Core components, tooth slot on probe rod and gear transmission, cooperate with encoder real-time acquisition displacement data.This design converts mechanical movement into electrical signal, handled by main control board and displayed on display, conveniently realize the measurement of exposed length to marking nail.

Description

Technical Field

[0001] This utility model relates to the field of measuring the thickness of shotcrete in the initial support of tunnels, specifically a rapid detector for the thickness of shotcrete in the initial support of plateau tunnels. Background Technology

[0002] Shotcrete application in the initial support of high-altitude tunnels is a crucial step in solidifying the tunnel walls after excavation. It falls under the category of initial support and its main functions include: improving structural stability by filling voids to reduce the risk of ground deformation (increasing load-bearing capacity by 30-50%); and enhancing sealing to reduce water and air penetration (permeability coefficient can be controlled within 1×10⁻). 8 (Below cm / s) to ensure construction safety; create conditions for subsequent support and ensure construction continuity. Construction precautions: Concrete mix strength must reach C20 or above; spray thickness controlled within the range of 5-15cm; and vibration curing must be performed (curing period ≥7 days).

[0003] Because controlling the sprayed thickness is necessary, thickness measurement is required. The embedded nail method is a common method for shotcrete application in tunnel initial support. Before construction, steel bar heads or marker nails are pre-embedded; after spraying, the thickness is calculated by measuring the length of the exposed portion—a direct detection method. Therefore, a rapid thickness detection instrument for shotcrete application in high-altitude tunnel initial support is proposed, which can quickly measure the length of the marker nails. Utility Model Content

[0004] The purpose of this invention is to provide a rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel includes a circular shell. A cylindrical body is fixedly connected to the top of the circular shell, and a guide tube is fixedly connected to the bottom of the circular shell. A probe rod is inserted through the guide tube, the cylindrical body, and the circular shell. The probe rod is slidably connected to the guide tube and extends outward. A cover is connected to the outside of the guide tube and is fitted over the lower end of the probe rod. The probe rod has a toothed groove, and a gear that drives the toothed groove is located on the outside of the groove. The gear is rotatably mounted to the circular shell and is fixedly connected to an encoder. The encoder is fixedly mounted to the circular shell. A support part for mounting the gear and the encoder is provided on the circular shell. A mobile power supply and a main control board are fixedly installed inside the circular shell. A display and operation buttons are provided on the front surface of the circular shell.

[0007] As a further embodiment of this utility model: a charging connector is provided on one side of the top of the circular housing, and a data connector is provided on the other side of the top of the circular housing.

[0008] As a further embodiment of this utility model: a rectangular block is fixedly connected to the top of the probe rod, the rectangular block is slidably connected inside the cylinder, and a spring is provided between the top surface of the rectangular block and the top inner wall of the cylinder.

[0009] As a further improvement of this utility model: the cover is threadedly connected to the guide tube, and a stop piece is fixedly connected to the top of the guide tube corresponding to the cover.

[0010] As a further embodiment of this utility model: a washer is fixedly connected to the bottom end of the cover, a slide plate is slidably connected inside the cover, the probe rod abuts against the slide plate, a positioning block is fixedly connected to the bottom surface of the slide plate, the positioning block passes through the washer and has a positioning groove.

[0011] As a further improvement of this utility model: the positioning groove is flush with the bottom surface of the gasket, and the gasket is reduced in diameter towards the opening of the cover.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model detector uses core components such as a circular shell, cylinder, guide tube, and probe rod. The toothed grooves on the probe rod and the gear transmission, together with the encoder, collect displacement data in real time. This design converts mechanical motion into electrical signals, which are processed by the main control board and displayed on the monitor, facilitating the measurement of the exposed length of the target nail.

[0014] 2. The cover of this utility model is connected to the guide tube by a thread and can be disassembled and replaced to avoid concrete sticking and affecting the measurement; the design of the gasket and positioning block ensures accurate positioning of the marker and is adaptable to wear and pollution on the construction site. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of a rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel.

[0016] Figure 2 This is a front sectional view of a rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel.

[0017] Figure 3 This is a top sectional view of a rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel.

[0018] In the diagram: 1. Circular shell; 2. Cylinder; 3. Guide tube; 4. Probe; 5. Cover; 6. Gear; 7. Gear; 8. Encoder; 9. Power bank; 10. Main control board; 11. Display; 12. Charging connector; 13. Data connector; 14. Rectangular block; 15. Spring; 16. Stop plate; 17. Washer ring; 18. Sliding plate; 19. Positioning block; 20. Positioning groove; 21. Operation button. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-3 In this embodiment of the invention, a rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel includes a circular shell 1. A cylinder 2 is fixedly connected to the top of the circular shell 1, and a guide tube 3 is fixedly connected to the bottom of the circular shell 1. A probe 4 is inserted through the guide tube 3, the cylinder 2, and the circular shell 1. A circular hole is provided on the circular shell 1 for the probe 4 to pass through and slide. The probe 4 is slidably connected to and extends out of the guide tube 3. A cover 5 is connected to the outside of the guide tube 3 and is fitted onto the outside of the lower end of the probe 4. A toothed groove 6 is provided on the probe 4, and a gear 7 is provided on the outside of the toothed groove 6 for transmission. The gear 7 is connected to the circular shell. 1. Rotary mounting: Gear 7 is fixedly connected to encoder 8. Encoder 8 is fixedly mounted to circular housing 1. Circular housing 1 is provided with a support for mounting gear 7 and encoder 8. Inside circular housing 1, a power supply 9 and a main control board 10 are fixedly mounted. The front surface of circular housing 1 is provided with a display 11 and operation buttons 21. Power supply 9 is used for power supply. Main control board 10 is used for signal output of display 11 and signal processing of encoder 8. Operation buttons 21 correspond to control buttons on main control board 10. Control buttons include positive / negative value conversion key, metric / imperial conversion key, origin zero setting key, and power on / off key.

[0021] Cover the corresponding marker with the cover 5 so that the probe rod 4 abuts against the end of the marker until the cover 5 contacts the inner wall of the tunnel or the concrete surface. At this time, the marker squeezes the probe rod 4 and slides and retracts along the guide tube 3. The probe rod 4 drives the gear 7 to rotate through the tooth groove 6. The gear 7 drives the shaft end of the encoder 8 to rotate. At this time, the main control board 10 performs signal processing and forms length data to be displayed on the display 11.

[0022] A charging connector 12 is provided on one side of the top of the circular housing 1, and a data connector 13 is provided on the other side of the top of the circular housing 1.

[0023] The charging connector 12 is used to connect the charger to charge the power bank 9, and the data connector 13 is used to connect the data cable to external devices such as laptops to output measurement data.

[0024] A rectangular block 14 is fixedly connected to the top of the probe rod 4. The rectangular block 14 is slidably connected inside the cylinder 2. The cylinder 2 has a rectangular cavity inside. A spring 15 is provided between the top surface of the rectangular block 14 and the top inner wall of the cylinder 2.

[0025] The rectangular block 14 prevents the probe rod 4 from slipping, and the spring 15 provides elasticity to the probe rod 4, keeping it in an outward pop-out state for easy reset.

[0026] The sleeve 5 is threaded onto the conduit 3. The conduit 3 has external threads, and the sleeve 5 has internal threads. A stop piece 16 is fixedly connected to the top of the conduit 3 corresponding to the top of the sleeve 5.

[0027] When the sleeve 5 is screwed onto the guide tube 3, it contacts the stop piece 16, thereby creating a stop and limiting effect. The sleeve 5 can be removed for easy replacement.

[0028] A washer 17 is fixedly connected to the bottom end of the cover 5. A slide plate 18 is slidably connected inside the cover 5. The probe 4 abuts against the slide plate 18. A positioning block 19 is fixedly connected to the bottom surface of the slide plate 18. The positioning block 19 passes through the washer 17 and has a positioning groove 20.

[0029] The positioning groove 20 is flush with the bottom surface of the washer 17, and the washer 17 is reduced in diameter towards the opening of the cover 5. The reduction in diameter is used to prevent the slide plate 18 from slipping off.

[0030] The cover 5 is connected to the guide tube 3 to protect the outside of the probe rod 4. The bottom end of the probe rod 4 is isolated by the sliding plate 18 and the positioning block 19. The positioning groove 20 is provided so that the marker can be inserted into the positioning groove 20 for positioning, thereby facilitating the squeezing of the positioning block 19 and avoiding deviation during squeezing.

[0031] The setting of the gasket 17 increases the contact area at the bottom of the cover 5.

[0032] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control circuit can be implemented by simple programming by those skilled in the art, which is common knowledge in the field.

[0033] The working principle of this utility model is as follows:

[0034] Before the initial shotcrete is applied, the cover 5 is fitted with the corresponding marker nails. The marker nails can be inserted into the positioning groove 20 for positioning. At this time, the marker nails press against the positioning block 19, and the positioning block 19 pushes the sliding piece 18 to slide inside the cover 5. The sliding piece 18 pushes the probe rod 4 to move. At this time, the marker nails press against the probe rod 4 and slide and retract along the guide tube 3. The probe rod 4 drives the gear 7 to rotate through the toothed groove 6. The length corresponding to one rotation of the gear 7 is counted as L. The gear 7 drives the shaft end of the encoder 8 to rotate, and the number of rotations is counted as X. At this time, the main control board 10 performs signal processing, H=L×X, and forms the length data H, which is displayed on the display 11 until the washer ring 17 abuts against the inner wall of the tunnel. At this time, the length data H1 is recorded. Then, the detector is removed, and under the action of the spring 15, it is... After the probe rod 4 is reset, the initial support sprayed concrete is further carried out. After the initial support sprayed concrete is completed, the cover 5 is further covered with the corresponding marker nail. The marker nail can be inserted into the positioning groove 20 for positioning. At this time, the marker nail presses the positioning block 19, and the positioning block 19 pushes the slider 18 to slide inside the cover 5. The slider 18 pushes the probe rod 4 to move. At this time, the marker nail presses the probe rod 4 to slide and retract along the guide tube 3. The probe rod 4 drives the gear 7 to rotate through the tooth groove 6. The gear 7 drives the shaft end of the encoder 8 to rotate. At this time, the main control board 10 performs signal processing to form length data H, which is displayed on the display 11 until the washer ring 17 abuts against the inner wall of the concrete. At this time, the length data H2 is recorded, and the concrete thickness H3 = H1 - H2, thus obtaining the concrete thickness.

[0035] During inspection, if there is a lot of concrete adhering to the cover 5 or the washer 17, the cover 5 can be removed and the entire cover replaced.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel, comprising a circular shell (1), characterized in that: The top of the circular shell (1) is fixedly connected to a cylindrical body (2), and the bottom of the circular shell (1) is fixedly connected to a conduit (3). A probe (4) is inserted through the conduit (3), the cylindrical body (2), and the circular shell (1). The probe (4) is slidably connected to the conduit (3) and extends out. A cover (5) is connected to the outside of the conduit (3). The cover (5) is fitted on the lower end of the probe (4). A toothed groove (6) is provided on the probe (4). A gear (7) is provided on the outside of the toothed groove (6) and drives it. The gear (7) is rotatably installed with the circular shell (1). The gear (7) is fixedly connected to an encoder (8). The encoder (8) is fixedly installed with the circular shell (1). A support part for the installation of the gear (7) and the encoder (8) is provided on the circular shell (1). A mobile power supply (9) and a main control board (10) are fixedly installed inside the circular shell (1). A display (11) and an operation button (21) are provided on the front surface of the circular shell (1).

2. The rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel according to claim 1, characterized in that: A charging connector (12) is provided on one side of the top of the circular housing (1), and a data connector (13) is provided on the other side of the top of the circular housing (1).

3. The rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel according to claim 1, characterized in that: A rectangular block (14) is fixedly connected to the top of the probe (4). The rectangular block (14) is slidably connected inside the cylinder (2). A spring (15) is provided between the top surface of the rectangular block (14) and the top inner wall of the cylinder (2).

4. The rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel according to claim 1, characterized in that: The cover (5) is threaded onto the guide tube (3), and a stop piece (16) is fixedly connected to the top of the cover (5) corresponding to the top of the guide tube (3).

5. The rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel according to claim 1, characterized in that: The bottom end of the cover (5) is fixedly connected to a washer (17), and a sliding piece (18) is slidably connected inside the cover (5). The probe (4) abuts against the sliding piece (18), and a positioning block (19) is fixedly connected to the bottom surface of the sliding piece (18). The positioning block (19) passes through the washer (17) and has a positioning groove (20).

6. The rapid detection instrument for the thickness of shotcrete in the initial support of a plateau tunnel according to claim 5, characterized in that: The positioning groove (20) is flush with the bottom surface of the washer (17), and the washer (17) is reduced in diameter towards the opening of the cover (5).

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