Anchor cable grouting double-temperature-change trigger control system

Abstract

The anchor cable grouting double-temperature-change trigger control system comprises a protection pipe, and the protection pipe is provided with a sliding rail extending in the axis direction of the protection pipe; the reed switch is arranged in the middle of the sliding rail, and the triggering magnetic flux of the reed switch is larger than 35 mT; the sliding block slides along the sliding rail, and the sliding block can penetrate through the reed switch when moving along the sliding rail; the memory metal spring structure is arranged at the lower end of the protection tube and is used for driving the sliding block to move; according to the system, a sliding block penetrates through a reed switch and then enters a clamping groove corresponding to a sliding rail so as to trigger a corresponding control signal, and signals triggered when the sliding block penetrates through the reed switch are a primary grouting initial setting completion signal and a secondary grouting starting signal respectively. According to the control system, through clamping groove limiting triggering in combination with memory metal temperature control and reed dynamic compensation, precise controllability is achieved; and meanwhile, the fault 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 trigger 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 change 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 arranged at the lower end of the protection tube, and the memory metal spring structure is used to drive the slider to move. The system triggers corresponding control signals by the slider entering the corresponding clamping groove of the slide rail after passing through the dry reed tube. The signals triggered by the slider passing through the dry reed tube are a primary grouting initial setting completion signal and a secondary grouting start signal, respectively.

[0007] Further, the memory metal spring structure is internally provided with a memory metal spring connected with the slider, and the memory metal spring is deformed by expansion and contraction in response to temperature changes to drive the slider to move.

[0008] Further, the memory metal spring structure comprises an external protection sleeve and the memory metal spring located in the protection sleeve.

[0009] Further, the cylinder wall of the protection sleeve is a four-layer structure, which comprises: A polyimide film located at the innermost layer, and the thickness of the polyimide film is 0.1 mm; A copper wire woven mesh located at the middle layer and close to the inner side of the protection sleeve, and the coverage of the copper wire woven mesh is 90%; A silica gel microporous sponge located at the middle layer and away from the outer side of the protection sleeve, and the thickness of the silica gel microporous sponge is 0.8 mm; A PTFE film located at the outermost layer of the protection sleeve; The wall thickness of the protection sleeve is 1.05 mm.

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

[0011] Further, a reset assist spring is arranged between the memory metal spring and the slider, and the pre-pressure of the reset assist spring is 0.8 N.

[0012] Further, the slider is a rubidium magnet slider, the diameter of the rubidium magnet slider is 6 mm, and a hole with a diameter of 3 mm is processed at the center of the rubidium magnet slider.

[0013] Further, the upper end of the slide rail is an upper clamping groove, and the lower end of the slide rail is a lower clamping groove.

[0014] Further, the material of the memory metal spring is NiTiNb alloy, and a graphene heat-conducting coating is coated on the outer surface of the memory metal spring.

[0015] In the above technical solution, the anchor cable grouting double-temperature variable triggering control system provided by the present application has the following beneficial effects: The control system of the application realizes precise control by the combination of the card slot limiting trigger, the memory metal temperature control and the reed dynamic compensation, so that the grouting opportunity error is compressed from ±45 min to ±2.8 min, 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%.

[0016] The system cost of the application is reduced, and the difficult problem of grouting control in complex geology is completely solved. In the extreme environment of temperature-45℃ to 80℃, amplitude ≤5mm and humidity 100% YH, the system can still maintain 100% trigger reliability and prolong the service life. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0018] Figure 1 It is a structural schematic diagram of electronic detection in the prior art. Figure 2 It is a structural schematic diagram of an anchor cable grouting double-temperature variable trigger control system disclosed by the embodiments of the present application. Figure 3 It is a structural schematic diagram of a protective sleeve of an anchor cable grouting double-temperature variable trigger control system disclosed by the embodiments of the present application. Figure 4 It is a grid skip grouting construction drawing of an anchor cable grouting double-temperature variable trigger control system disclosed by the embodiments of the present application.

[0019] Explanation of reference signs: 1, tool main frame body; 2, movable slide rail; 3, stamping frame; 4, bubble level; 5, main machine handle; 6, laser line instrument; 101, quadrilateral main frame body; 102, short side; 103, long side; 301, bottom plate; 302, frame; 303, stamping probe; 501, hand-held slot. DETAILED DESCRIPTION

[0020] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0021] Referring to Figures 2 to 4 as shown; The embodiments disclose an anchor cable grouting double-temperature variable trigger control system, which comprises: A 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 greater than 35 mT; A slider 4 slides along the slide rail 2 and can pass through the reed switch 3 when the slider 4 moves along the slide rail; and A memory metal spring structure is arranged at the lower end of the protective tube 1, and the memory metal spring structure drives the slider 2 to move; The system triggers corresponding control signals when the slider 4 enters the corresponding clamping groove of the slide rail 2 after passing through the reed switch 3, and the signals triggered by the slider 4 passing through the reed switch 3 are respectively a primary grouting initial setting completion signal and a secondary grouting start signal.

[0022] Specifically, the embodiment discloses a control system based on the double-response characteristics of memory metal to the hydration heat temperature change of concrete, which realizes initial setting prompting and grouting self-starting. The upper part of the control system is a protective tube 1, and a reed switch 3 is arranged on the protective tube 1. Meanwhile, a slide rail 2 and a slider 4 capable of sliding along the slide rail 2 are arranged at the position of the reed switch 3. The slider 4 of the embodiment can be embedded into the corresponding clamping groove to realize limiting triggering when the slider 4 slides to the upper end and the lower end of the slide rail 2. Meanwhile, the slider 4 can pass through the middle reed switch 3 when the slider 4 slides. The embodiment drives the slider 4 to move through a memory metal spring structure. The memory metal spring 6 is made of a NiTiNb alloy spring, which reduces temperature control delay. Meanwhile, the memory alloy is coated with a graphene heat-conducting coating, which enhances the temperature response speed of the spring. A protective sleeve 5 is arranged outside the spring. When the temperature reaches 45 DEG C, the initial setting is completed, the memory metal spring 6 shrinks by 5 mm. As the temperature rises, the memory metal spring 6 continues to shrink, and the displacement degree is greater than 5 mm. Until the temperature reaches the highest point, the temperature begins to drop. When the temperature drops to the critical time of secondary grouting, the temperature falls to 45 DEG C, the memory metal spring 6 resets to 5 mm, and the reset accuracy is ± 0.05 mm. The second grouting is started.

[0023] Preferably, the memory metal spring structure of the embodiment is internally provided with a memory metal spring 6 connected with the slider 4, and the memory metal spring 6 expands and deforms to drive the slider 4 to move through sensing temperature change.

[0024] More preferably, the memory metal spring structure of the embodiment comprises an external protective sleeve 5 and a memory metal spring 6 arranged in the protective sleeve 5.

[0025] Referring to FIG. 1, Figure 3 The cylinder wall of the protective sleeve 5 of the embodiment is a four-layer structure, which comprises: A polyimide film 501 is arranged at the innermost layer, and the thickness of the polyimide film 501 is 0.1 mm. The polyimide film 501 plays a role of electrical insulation and can prevent the memory metal from being affected. The temperature resistance of the polyimide film 501 is 200 DEG C. The copper wire woven net 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 woven net 502 is 90%; the copper wire woven net 502 can play the role of axial heat conduction acceleration response, the thermal conductivity is increased by 300%, and the response speed of the memory metal is accelerated; The silica gel microporous sponge 503 is located in the middle layer and away from the outer side of the protective sleeve 5, and the thickness of the silica gel microporous sponge 503 is 0.8 mm; the silica gel microporous sponge 503 of the embodiment can buffer the stress of surrounding rock, the compression resistance is 50 MPa, and the compression rate is 70% to ensure the free deformation of the memory metal; The PTFE film 504 is located in the outermost layer of the protective sleeve 5; the wall thickness of the protective sleeve 5 is 1.05 mm. The contact angle of the PTFE film 504 of the embodiment is 120°, which prevents water and mud from penetrating, and the microporous structure is breathable and water-proof.

[0026] Preferably, the lower end of the protective pipe 1 and the upper end of the protective sleeve 5 of the embodiment are both provided with through holes, and the memory metal spring 6 passes through the through holes and extends into the protective pipe 1.

[0027] Preferably, the memory metal spring 6 and the sliding block 4 of the embodiment are provided with a reset booster spring piece 7, and the pre-pressure of the reset booster spring piece 7 is 0.8 N.

[0028] The sliding block 4 of the embodiment is a rubidium magnet sliding block, and the diameter of the rubidium magnet sliding block is 6 mm, and a hole with a diameter of 3 mm is processed in the center of the rubidium magnet sliding block.

[0029] The embodiment adopts a composite driving structure of memory metal spring 6+reset booster spring piece 7, wherein the NiTiNb memory metal responds to the temperature change of concrete, the pre-pressure of the reset booster spring piece 7 is 0.8 N, the linear force coefficient is 0.05 N / ℃, the deficiency of the memory metal restoring force is compensated, and 100% reset is ensured. It replaces the traditional electronic signal link, and the failure rate is reduced by 90%.

[0030] In order to realize the limiting triggering of the sliding block 4 and the clamping groove, the upper end of the sliding rail 2 is an upper clamping groove 201, and the lower end of the sliding rail 2 is a lower clamping groove 202.

[0031] The working process is that the initial setting temperature is increased to 45℃ after one-time grouting, at this time, the memory metal spring 6 shrinks and drives the magnet sliding block to move downward to trigger the closure of the dry reed tube 3 and enter the lower clamping groove 202, at this time, the indicator light is powered on, and the external response period green light is on, which represents that the initial setting is completed. When the initial setting is completed, the temperature rises again, and the memory metal spring 6 resets and opens, and drives the magnet sliding block to move upward to trigger the closure of the dry reed tube 3 for the second time, and the grouting pump is powered on to start the second low-pressure grouting.

[0032] As an extended embodiment, the grouting execution unit of the embodiment is a fly ash slurry high-pressure primary pipe and a low-pressure secondary pipe, wherein the diameter of the high-pressure primary pipe is 20 mm, and the diameter of the low-pressure secondary pipe is 12 mm. Figure 4 As shown in the figure, the grid skip grouting algorithm is used in the grouting of the embodiment, and the overflow is fed back to the sensor, and the grouting is automatically skipped for 2 units.

[0033] In the above technical solution, the anchor cable grouting double-temperature variable trigger control system provided by the application has the following beneficial effects: The control system of the application realizes precise control by combining the card slot limiting trigger with the memory metal temperature control and the reed dynamic compensation, so that the grouting opportunity error is compressed from ±45 min to ±2.8 min, 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%.

[0034] The system cost of the application is reduced, and the difficult problem of grouting control in complex geology is completely solved.

[0035] The above only describes some exemplary embodiments of the application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the application. Therefore, the above figures and description are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the application.

Claims

1. A dual-temperature variable trigger control system for anchor cable grouting, 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 (2) to move. The system enters the corresponding slot of the slide rail (2) after the slider (4) passes through the reed tube (3) to trigger the corresponding control signal. 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.

2. The dual-temperature variable triggering control system for anchor cable grouting according to claim 1, characterized in that, The memory metal spring structure has a memory metal spring (6) connected to the slider (4) inside, and the memory metal spring (6) stretches and deforms by sensing temperature changes, thereby driving the slider (4) to move.

3. The dual-temperature variable triggering control system for anchor cable grouting according to claim 2, 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).

4. The dual-temperature variable triggering control system for anchor cable grouting according to claim 3, 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 away 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.

5. The dual-temperature variable triggering control system for anchor cable grouting according to claim 3, 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).

6. The dual-temperature variable triggering control system for anchor cable grouting according to claim 5, 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.

7. The dual-temperature variable triggering control system for anchor cable grouting according to claim 3, 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.

8. The dual-temperature variable trigger 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).

9. The dual-temperature variable triggering control system for anchor cable grouting according to claim 3, 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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