Anchord cable grouting double temperature variable trigger control system

Abstract

The application discloses an anchor cable grouting double-temperature variable trigger control system, which comprises a protection pipe, the protection pipe is provided with a sliding rail extending along the axial direction of the protection pipe; a dry reed pipe is arranged at the middle position of the sliding rail, and the trigger magnetic flux of the dry reed pipe is greater than 35 mT; a sliding block is arranged to slide along the sliding rail, and the sliding block can pass through the dry reed pipe when the sliding block moves along the sliding rail; and a memory metal spring structure is arranged at the lower end of the protection pipe, and the memory metal spring structure is used to drive the sliding block to move; the system triggers corresponding control signals by the sliding block entering the corresponding clamping groove of the sliding rail to trigger the corresponding control signals after the sliding block passes through the dry reed pipe, and the signals triggered by the sliding block passing through the dry reed pipe are respectively a primary grouting initial setting completion signal and a secondary grouting start signal. The control system of the application realizes precise control through the clamping groove limiting trigger, the memory metal temperature control and the reed dynamic compensation, the failure rate is reduced from 15% to 0.3%, the construction efficiency is improved by 300%, and the carbon emission is reduced by 42.4%.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering anchor grouting technology, and in particular to an anchor grouting dual-temperature variable triggering control system, which is especially suitable for low-carbon and high-efficiency reinforcement under complex geological conditions such as tunnels and mine roadways, and solves the problems of response lag and unreliable triggering in traditional processes. Background Technology

[0002] Currently, the two most common triggering methods in existing technologies are as follows: The first type: such as Figure 1 As shown, the Chinese invention patent with authorization announcement number CN202311606843U, entitled "Multi-Grouting Machine Collaborative Control System", is based on electronic detection. It mainly uses a wireless communication module to connect to the main controller and monitors the displacement of the surrounding rock through electronic sensors. The displacement threshold triggers synchronous grouting of multiple pumps. It relies on an external power supply and complex circuits. Its disadvantages are that the failure rate of electronic equipment in humid and vibrating environments is >15%, the response delay is >2 hours, and the cost of a single set is >50,000 yuan, making it uneconomical.

[0003] The second method, as disclosed in the 3rd edition of the "Handbook of Rock and Soil Anchoring Technology" (2020), pp. 125-128, involves an integrated spring damper at the anchor head. A mechanical switch is triggered to start the pump when the surrounding rock displacement is ≥5mm, and sequential grouting is used to suppress cross-grouting. Its disadvantages are that it only responds to mechanical displacement and cannot detect the concrete temperature change process, thus missing the optimal grouting window (error ±45min). The spring is prone to corrosion in humid environments, with a lifespan of only 2-3 years. Initial setting judgment relies on manual experience, resulting in a missed judgment rate >20%.

[0004] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a dual-temperature variable trigger control system for anchor cable grouting. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-temperature-varying trigger control system for anchor cable grouting. This system utilizes the dual-response characteristics of shape memory metal to the temperature variation of concrete hydration heat to achieve mechanical and automated control of initial setting indication and automatic grouting start.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a dual-temperature variable triggering control system for anchor cable grouting, the system comprising: A protective tube having a slide rail extending along its axial direction; A reed switch is arranged at the middle position of the slide rail, and the triggering magnetic flux of the reed switch is >35mT; A slider that slides along the slide rail, and the slider, when moving along the slide rail, is able to pass through the reed switch; and A memory metal spring structure is provided at the lower end of the protective tube, and the memory metal spring structure is used to drive the slider to move; The system triggers a corresponding control signal by having the slider pass through the reed switch and enter the corresponding slot of the slide rail. The signals triggered by the slider passing through the reed switch are the initial setting completion signal of the first grouting and the start signal of the second grouting.

[0007] Furthermore, the memory metal spring structure contains a memory metal spring connected to the slider, and the memory metal spring expands and contracts in response to temperature changes, thereby driving the slider to move.

[0008] Furthermore, the memory metal spring structure includes an outer protective sleeve and the memory metal spring located inside the protective sleeve.

[0009] Furthermore, the protective sleeve has a four-layer structure, namely: The innermost layer is a polyimide film, and the thickness of the polyimide film is 0.1 mm; A copper wire braided mesh is located in the middle layer and close to the inner side of the protective sleeve, and the coverage of the copper wire braided mesh is 90%. A silicone microporous sponge located in the middle layer and away from the outer side of the protective sleeve, the silicone microporous sponge having a thickness of 0.8 mm; The PTFE membrane located on the outermost layer of the protective sleeve; The protective sleeve has a wall thickness of 1.05 mm.

[0010] Furthermore, both the lower end of the protective tube and the upper end of the protective sleeve are provided with through holes, through which the memory metal spring passes and extends into the protective tube.

[0011] Furthermore, a reset assist spring is provided between the memory metal spring and the slider, and the preload of the reset assist spring is 0.8N.

[0012] Furthermore, the slider is a neodymium magnet slider, and the diameter of the neodymium magnet slider is 6mm, and a hole with a diameter of 3mm is machined in the center of the neodymium magnet slider.

[0013] Furthermore, the upper end of the slide rail is an upper slot, and the lower end of the slide rail is a lower slot.

[0014] Furthermore, the shape memory spring is made of NiTiNb alloy, and the outer surface of the shape memory spring is coated with a graphene thermally conductive coating.

[0015] In the above technical solution, the dual-temperature variable triggering control system for anchor cable grouting provided by the present invention has the following beneficial effects: The control system of this invention achieves precise control by combining slot limit triggering with memory metal temperature control and spring dynamic compensation, reducing the grouting timing error from ±45min to ±2.8min; at the same time, the failure rate is reduced from 15% to 0.3%, construction efficiency is increased by 300%, and carbon emissions are reduced by 42.4%.

[0016] The system of this invention reduces system cost and completely solves the problem of grouting control in complex geological conditions. Even in extreme environments with temperatures ranging from -45°C to 80°C, amplitudes ≤5mm, and humidity of 100%, the system can still maintain 100% trigger reliability and extend its lifespan. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the structure of electronic detection in the prior art; Figure 2 This is a schematic diagram of the structure of a dual-temperature variable triggering control system for anchor cable grouting disclosed in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a protective sleeve for a dual-temperature variable triggering control system for anchor cable grouting disclosed in an embodiment of this application; Figure 4 This is a grid jump grouting construction diagram of a dual-temperature variable triggering control system for anchor cable grouting disclosed in an embodiment of this application. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] See Figures 2 to 4 As shown; This embodiment discloses a dual-temperature variable triggering control system for anchor cable grouting, the system comprising: The protective tube 1 has a slide rail 2 extending along its axial direction; A reed switch 3 is positioned in the middle of slide rail 2, and the triggering magnetic flux of reed switch 3 is greater than 35mT; A slider 4 slides along slide rail 2, and when slider 4 moves along slide rail, it can pass through reed switch 3; and A memory metal spring structure is set at the lower end of the protective tube 1, and the memory metal spring structure is used to drive the slider 4 to move. The system triggers the corresponding control signal by having the slider 4 pass through the reed switch 3 and enter the corresponding slot of the slide rail 2. The signals triggered by the slider 4 passing through the reed switch 3 are the initial setting completion signal of the first grouting and the start signal of the second grouting.

[0021] Specifically, this embodiment discloses a control system based on the dual-response characteristics of shape memory metal in response to the temperature change of concrete hydration heat, realizing initial setting indication and automatic grouting start. The upper part is a protective tube 1, equipped with a reed switch 3. Simultaneously, a slide rail 2 and a slider 4 that can slide along the slide rail 2 are located at the position of the reed switch 3. In this embodiment, the slider 4 can be inserted into corresponding slots at both the upper and lower ends of the slide rail 2 to achieve limit triggering. Simultaneously, the slider 4 can pass through the middle reed switch 3. In this embodiment, the slider 4 is driven by a shape memory metal spring structure. The shape memory metal spring 6 is made of NiTiNb alloy to reduce temperature control delay. Simultaneously, the shape memory alloy is coated with a graphene thermally conductive coating to enhance the spring's temperature response speed. A protective sleeve 5 is provided on the outside of the spring. When the temperature reaches 45℃, initial setting is completed, and the shape memory metal spring 6 contracts and displaces by 5mm. As the temperature rises, the shape memory metal spring 6 continues to contract, with a displacement greater than 5mm, until the temperature reaches its highest point, after which the temperature begins to decrease. When the temperature drops to the critical point of secondary grouting, the temperature falls back to 45℃, the memory metal spring 6 returns to 5mm, with a return accuracy of ±0.05mm, and the second grouting is initiated.

[0022] Preferably, in this embodiment, the memory metal spring structure is provided with a memory metal spring 6 connected to the slider 4, and the memory metal spring 6 expands and contracts due to temperature changes, thereby driving the slider 4 to move.

[0023] More preferably, the memory metal spring structure of this embodiment includes an outer protective sleeve 5 and a memory metal spring 6 located inside the protective sleeve 5.

[0024] See Figure 3 As shown, the protective sleeve 5 in this embodiment has a four-layer structure, namely: The innermost layer is a polyimide film 501, and the thickness of the polyimide film 501 is 0.1 mm. This polyimide film 501 serves as an electrical insulator, which can prevent the shape memory metal from being affected, and its temperature resistance is 200℃. The copper wire braided mesh 502 is located in the middle layer and close to the inner side of the protective sleeve 5, and the coverage of the copper wire braided mesh 502 is 90%. The copper wire braided mesh 502 can play the role of axial heat conduction and accelerated response, increasing the thermal conductivity by 300% and accelerating the response speed of the shape memory metal. The silicone microporous sponge 503, located in the middle layer and far from the outer side of the protective sleeve 5, has a thickness of 0.8 mm. In this embodiment, the silicone microporous sponge 503 can buffer the stress of the surrounding rock, has a compressive strength of 50 MPa, and a compression rate of 70% to ensure the free deformation of the shape memory metal. The outermost layer of the protective sleeve 5 is a PTFE membrane 504; the wall thickness of the protective sleeve 5 is 1.05 mm. In this embodiment, the PTFE membrane 504 has a contact angle of 120°, is waterproof and prevents mud penetration, and has a microporous structure that is breathable but impermeable to water.

[0025] Preferably, in this embodiment, the lower end of the protective tube 1 and the upper end of the protective sleeve 5 are both provided with through holes, and the memory metal spring 6 passes through the through holes and extends into the protective tube 1.

[0026] Preferably, in this embodiment, a reset assist spring 7 is provided between the memory metal spring 6 and the slider 4, and the preload of the reset assist spring 7 is 0.8N.

[0027] In this embodiment, the slider 4 is a neodymium magnet slider with a diameter of 6mm and a 3mm diameter hole machined in the center.

[0028] This embodiment employs a composite drive structure consisting of a shape memory metal spring 6 and a reset assist spring 7. The NiTiNb shape memory metal responds to temperature changes in the concrete, while the reset assist spring 7 has a preload of 0.8N and a linear force amplification coefficient of 0.05N / ℃, compensating for the insufficient restoring force of the shape memory metal and ensuring 100% reset. This replaces the traditional electronic signal link, reducing the failure rate by 90%.

[0029] In order to achieve the limit triggering of slider 4 and slot, the upper end of slide rail 2 in this embodiment is upper slot 201, and the lower end of slide rail 2 is lower slot 202.

[0030] The workflow is as follows: After the initial grouting is completed and the initial setting temperature rises to 45℃, the shape memory metal spring 6 contracts and moves the magnetic slider downward, triggering the closure of the reed switch 3 and entering the lower slot 202. At this time, the indicator light is powered on and the external green light illuminates, indicating that the initial setting is complete. After the initial setting is completed and the temperature rises again, it resets and drops to 45℃. The shape memory metal spring 6 resets and opens, moving the magnetic slider upward and triggering the closure of the reed switch 3 for the second time. The grouting pump is then powered on and starts for the second low-pressure grouting.

[0031] As an extended implementation method, the grouting execution units in this embodiment are a high-pressure primary pipe and a low-pressure secondary pipe for fly ash slurry, wherein the high-pressure primary pipe has a diameter of 20mm and the low-pressure secondary pipe has a diameter of 12mm. Next, see... Figure 4 As shown, this embodiment uses a grid skip grouting algorithm during grouting. After grout overflows, feedback is sent to the sensor, and grouting automatically skips two units for grouting.

[0032] In the above technical solution, the dual-temperature variable triggering control system for anchor cable grouting provided by the present invention has the following beneficial effects: The control system of this invention achieves precise control by combining slot limit triggering with memory metal temperature control and spring dynamic compensation, reducing the grouting timing error from ±45min to ±2.8min; at the same time, the failure rate is reduced from 15% to 0.3%, construction efficiency is increased by 300%, and carbon emissions are reduced by 42.4%.

[0033] The system of this invention reduces system cost and completely solves the problem of grouting control in complex geological conditions. Even in extreme environments with temperatures ranging from -45°C to 80°C, amplitudes ≤5mm, and humidity of 100%, the system can still maintain 100% trigger reliability and extend its lifespan.

[0034] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A cable grouting double temperature variable trigger control system, characterized in that, The system includes: The protective tube (1) has a slide rail (2) extending along its axial direction. A reed switch (3) is arranged at the middle position of the slide rail (2), and the triggering magnetic flux of the reed switch (3) is >35mT; A slider (4) that slides along the slide rail (2), and the slider (4) can pass through the reed switch (3) when it moves along the slide rail (2); and A memory metal spring structure is provided at the lower end of the protective tube (1), and the memory metal spring structure is used to drive the slider (4) to move; The system triggers the corresponding control signal by passing the slider (4) through the reed tube (3) and entering the corresponding slot of the slide rail (2). The signals triggered by the slider (4) passing through the reed tube (3) are the initial setting completion signal of the first grouting and the start signal of the second grouting. The memory metal spring structure is provided with a memory metal spring (6) connected to the slider (4). The memory metal spring (6) senses the temperature change and expands and deforms to drive the slider (4) to move.

2. The dual-temperature variable triggering control system for anchor cable grouting according to claim 1, characterized in that, The memory metal spring structure includes an outer protective sleeve (5) and a memory metal spring (6) located inside the protective sleeve (5).

3. The dual-temperature variable triggering control system for anchor cable grouting according to claim 2, characterized in that, The protective sleeve (5) has a four-layer structure, namely: The innermost layer is a polyimide film (501), and the thickness of the polyimide film (501) is 0.1 mm; A copper wire mesh (502) is located in the middle layer and close to the inner side of the protective sleeve (5), and the coverage of the copper wire mesh (502) is 90%. The silicone microporous sponge (503) is located in the middle layer and is far from the outside of the protective sleeve (5), and the thickness of the silicone microporous sponge (503) is 0.8 mm. The PTFE membrane (504) located on the outermost layer of the protective sleeve (5); The protective sleeve (5) has a wall thickness of 1.05 mm.

4. The dual-temperature variable triggering control system for anchor cable grouting according to claim 2, characterized in that, The lower end of the protective tube (1) and the upper end of the protective sleeve (5) are both provided with through holes, and the memory metal spring (6) passes through the through holes and extends into the protective tube (1).

5. The dual-temperature variable triggering control system for anchor cable grouting according to claim 4, characterized in that, A reset assist spring (7) is provided between the memory metal spring (6) and the slider (4), and the preload of the reset assist spring (7) is 0.8N.

6. The dual-temperature variable triggering control system for anchor cable grouting according to claim 2, characterized in that, The slider (4) is a rubidium magnet slider with a diameter of 6mm and a 3mm diameter hole machined in the center.

7. The dual-temperature variable triggering control system for anchor cable grouting according to claim 1, characterized in that, The upper end of the slide rail (2) is an upper slot (201), and the lower end of the slide rail (2) is a lower slot (202).

8. The dual-temperature variable triggering control system for anchor cable grouting according to claim 2, characterized in that, The shape memory metal spring (6) is made of NiTiNb alloy, and the outer surface of the shape memory metal spring (6) is coated with a graphene thermal conductive coating.

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