A portable pressure-type grouting device for hard rock expansion cracking

Abstract

The present invention discloses a portable pressure-type grouting equipment for hard rock expansion and fracturing, which relates to the technical field of grouting equipment. The grouting equipment includes an anti-backflow grouting pipe, a plunger-type propulsion device, a multi-power controller, a hopper, and a bracket. The present invention provides two forms of power sources, namely hydraulic power and pneumatic power. When encountering a thick slurry with a relatively small water-cement ratio, hydraulic power can be used, and when encountering a thin slurry with a relatively large water-cement ratio, it can be switched to pneumatic power. The various power forms can effectively cope with different forms of grouting liquids and meet various on-site engineering needs; at the same time, the present invention provides a detachable solution, and its larger hopper and bracket can be disassembled and assembled through a threaded interface, which can effectively cope with carrying and use in different working environments, overcoming the difficulties of previous grouting equipment that is difficult to carry due to its large size and difficult to operate in a small space.

Description

Technical Field

[0001] The invention relates to the technical field of grouting equipment, and in particular to a portable grouting equipment suitable for performing hard rock expansion and fracturing when a coal mining working face passes through a fault. Background Art

[0002] Grouting is a construction method in which a cementing material is prepared into a slurry and injected into loose sand- or water-containing strata, fissured rock strata, caves, and fractured zones to solidify it. In the engineering field, grouting technology is widely used in foundation reinforcement, tunnel lining consolidation, groundwater control, and other aspects of underground projects. After the slurry solidifies and hardens, it plays a cementing and plugging role, stabilizing the stratum and isolating the water source to ensure smooth construction. With the development of technology, the application scope of this technology has become increasingly wider. When the working face crosses a fault and encounters a hard rock section, traditional loosening blasting, hard cutting, and other methods are very likely to cause great safety hazards and economic losses. However, the use of static expansion agent advance grouting to cause fractures to effectively reduce safety risks and has the advantages of being economical, efficient, pollution-free, and noise-free.

[0003] However, there are some existing grouting equipment, such as tubular grouting equipment and drill grouting equipment, which can realize automatic grouting and improve grouting efficiency. However, due to process requirements and other reasons, the design volume is often relatively large. In certain specific work sites, such as coal mining working faces in coal mines, the working space is small and the environment is harsh, and common grouting equipment cannot be easily transported and used. At the same time, some improved small grouting equipment often faces insufficient grouting thrust, making it difficult to push thick slurries with relatively low water-cement ratios, such as static expansion agents, to the predetermined grouting location, which brings inconvenience to grouting construction and greatly reduces construction efficiency. Summary of the Invention

[0004] In view of this, the present invention discloses a portable press-in grouting equipment for hard rock expansion and fracturing. Through a variety of power forms, it can effectively handle grouting liquids in different forms and meet various on-site engineering needs. At the same time, it is easy to carry and use, overcoming the difficulties of previous grouting equipment that is difficult to carry due to its large size and difficult to operate in a small space.

[0005] According to the purpose of the present invention, a portable pressure-injection grouting device for hard rock expansion fracturing is proposed, which includes an anti-backflow grouting pipe, a plunger-type propulsion device, a multi-power controller, a hopper and a bracket.

[0006] The anti-backflow grouting pipe includes a pipe body, a check valve and a one-way air guide valve; one end of the pipe body is sealed and fixedly connected to the multi-power controller, and the other end is provided with a slurry outlet connected to the grouting conduit, and the plunger-type propulsion device is arranged in the pipe body at one end close to the multi-power controller; the check valve is fixedly installed along the cross-section of the pipe body at one end inside the pipe body close to the slurry outlet; an air guide opening is provided on the pipe body between the check valve and the plunger-type propulsion device, and the one-way air guide valve is installed in the air guide opening.

[0007] The plunger-type propulsion device includes a propulsion plug, a hydraulic rod and a return spring; the propulsion plug is movably arranged in the tube body and matches the cross-section of the tube body; there are at least two symmetrically arranged hydraulic rods, one end of each hydraulic rod is fixedly connected to the inner wall of the tube body, and is connected to the liquid outlet of the multi-power controller through an oil pipe, and the other end is fixedly connected to the propulsion plug; the return spring is sleeved outside the hydraulic rod, one end is fixedly connected to the propulsion plug, and the other end is fixedly connected to the inner wall of the tube body.

[0008] The multi-power controller is an integrally formed component, which is sealed and fixed to the end of the anti-backsuction grouting pipe away from the slurry outlet; the multi-power controller includes a power switching control component, a power transmission pipeline and a pressure monitoring device; the power switching control component includes a multi-power switching switch and a pressure control switch; the multi-power switching switch is used to switch hydraulic power and pneumatic power; the pressure control switch is used to adjust the hydraulic oil pressure and air pressure; the power transmission pipeline includes a hydraulic oil pipeline and a high-pressure gas pipeline, and the hydraulic oil pipeline is at least two arranged in conjunction with the hydraulic rod, and the liquid outlet of the hydraulic oil pipeline is connected to the hydraulic rod; the air outlet of the high-pressure gas pipeline is connected to the pipe body; the multi-power switching switch and the pressure control switch are both installed on the hydraulic oil pipeline and the high-pressure gas pipeline; the pressure monitoring device includes a pressure gauge, which is connected to the hydraulic oil pipeline and the high-pressure gas pipeline through a parallel pipeline for monitoring the hydraulic oil pressure and air pressure.

[0009] The hopper is arranged above one end of the tube body close to the slurry outlet and is connected to the inner cavity of the tube body through the outlet.

[0010] The bracket is arranged below the tube body to support the tube body.

[0011] Preferably, the pressure monitoring device also includes a data processing module; the data processing module is connected to the pressure gauge, the multi-power switching switch, and the pressure control switch, and is used to collect and process the pressure gauge data to automatically control the multi-power switching switch and the pressure control switch.

[0012] Preferably, the tube body is provided with a threaded interface at the upper and lower parts near the pulp outlet; the hopper and the bracket are detachably fixedly connected to the tube body through the threaded interfaces respectively.

[0013] Preferably, a double-screw agitator is installed at the discharge port of the hopper.

[0014] Preferably, the bracket includes three three-section sleeve legs, each section of the leg is equipped with a fixed plate buckle, and a non-slip rubber foot pad is installed at the bottom.

[0015] Preferably, the one-way air guide valve includes a valve flap and a damping pin; during the advancement of the thrust plug, the valve flap of the one-way air guide valve is in a closed state under the action of the damping pin; when the thrust plug returns, the tube body is in a negative pressure state and the valve flap opens.

[0016] Preferably, the push plug is provided with a protrusion, and the inner wall of the tube body is provided with a long groove matching the protrusion along the extension direction of the tube body.

[0017] Compared with the prior art, the advantages of the portable pressure-injection grouting equipment for hard rock expansion fracturing disclosed in the present invention are:

[0018] (1) The present invention provides two forms of power sources, namely hydraulic power and pneumatic power. Hydraulic power can be used when encountering a thick slurry with a relatively small water-cement ratio, and pneumatic power can be switched to when encountering a thin slurry with a relatively large water-cement ratio. Multiple power forms can effectively cope with different forms of grouting liquids and meet various on-site engineering needs.

[0019] (2) The present invention provides a detachable solution, wherein the larger hopper and bracket can be detached and assembled through a threaded interface, which can effectively cope with the carrying and use in different working environments, and overcome the difficulties of previous grouting equipment that is difficult to carry due to its large size and difficult to operate in a small space.

[0020] (3) The present invention installs a hopper at the front end of the grouting pipe when designing the grouting pipe. The slurry falls directly into the grouting pipe under the action of gravity and the stirring device. The front of the landing point is the discharge port, which reduces the flow of the slurry in the pipe and reduces the adhesion of the slurry on the pipe wall, thereby reducing the friction in the propulsion process, which can effectively improve the utilization rate of the slurry and the smoothness of the propulsion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0022] Figure 1 The present invention is a schematic structural diagram of a portable pressure-injection grouting device for hard rock expansion and fracturing.

[0023] Figure 2 It is a schematic diagram of the one-way air guide valve structure.

[0024] Figure 3 Schematic diagram of the internal structure of the anti-backflow grouting pipe.

[0025] Figure 4 Schematic diagram of the internal structure of the multi-power controller.

[0026] Figure 5 Schematic diagram of on-site grouting construction.

[0027] Figure: 1 - Anti-backflow grouting pipe; 11 - Pipe body; 12 - Check valve; 13 - Slurry outlet; 14 - Long groove; 15 - One-way air guide valve; 151 - Valve disc; 152 - Damping pin; 16 - Air guide opening; 2 - Plunger propulsion device; 21 - Propeller plug; 22 - Return spring; 23 - Hydraulic rod; 24 - Bump; 3 - Multi-power controller; 311 - Multi-power switching switch; 312 - Pressure control switch ;321-data processing module;322-pressure gauge;331-hydraulic oil pipeline;332-high-pressure gas pipeline;333-liquid outlet;334-liquid inlet;335-air outlet;336-air inlet;4-hopper;41-double-screw agitator;42-discharge port;5-bracket;51-support leg;52-fixed plate buckle;53-anti-slip rubber foot pad;6-handle;7-grouting catheter;8-grouting orifice. DETAILED DESCRIPTION

[0028] The following is a brief description of the specific embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are also within the scope of protection of the present invention.

[0029] Figure 1-Figure 5 The preferred embodiments of the present invention are shown and analyzed in detail.

[0030] like Figure 1 The portable pressure-injection grouting equipment shown is used for hard rock expansion fracturing, and includes an anti-backflow grouting pipe 1, a plunger-type propulsion device 2, a multi-power controller 3, a hopper 4 and a bracket 5.

[0031] The anti-backflow grouting pipe 1 includes a pipe body 11, a non-return valve 12 and a one-way air guide valve 15. One end of the pipe body 11 is sealed and fixedly connected to the multi-power controller 3, and the other end is provided with a slurry outlet 13 connected to the grouting conduit 7. The plunger-type propulsion device 2 is provided in the pipe body 11 at one end close to the multi-power controller 3. The non-return valve 12 is fixedly installed along the cross section of the pipe body 11 at one end of the pipe body 11 close to the slurry outlet 13, which can ensure that the slurry will not flow back during the injection process, and can also prevent air and impurities from entering the interior of the pipeline, effectively reducing the resistance of the propulsion plug 21 during the propulsion process, thereby ensuring the stability and reliability of the grouting effect. Figure 2 As shown, an air guide hole 16 is provided on the tube body 11 between the check valve 12 and the plunger-type propulsion device 2. A one-way air guide valve 15 is installed in the air guide hole 16. The one-way air guide valve 15 includes a valve flap 151 and a damping pin 152. During the advancement of the propulsion plug 21, the valve flap 151 of the one-way air guide valve 15 is closed under the action of the damping pin 152. During the return stroke of the propulsion plug 21, the tube body 11 is in a negative pressure state, and the valve flap 151 opens. The provision of the one-way air guide valve 15 ensures a smooth return stroke of the propulsion plug 21, thereby achieving continuous grouting.

[0032] like Figure 3 As shown, the plunger-type propulsion device 2 includes a propulsion plug 21, a hydraulic rod 23, and a return spring 22. The propulsion plug 21 is movably disposed within the tubular body 11, matching the cross-section of the tubular body 11. A protrusion 24 is provided on the propulsion plug 21, and a long groove 14 is provided along the inner wall of the tubular body 11 along the extension direction of the tubular body 11 to match the protrusion 24. The two are nested and matched to form a slide rail to ensure the axial movement of the propulsion plug 21 along the inner wall of the tubular body 11. The long groove 14 is rectangular in shape to match the protrusion 24 on the propulsion plug 21. The long groove 14 is directly cut into the inner wall of the tubular body 11. The protrusion 24 in the plunger-type propulsion device 2 has a raised structure on its surface, which enables it to match the groove in the long groove 14. Two hydraulic rods 23 are symmetrically arranged. One end of each hydraulic rod 23 is fixedly connected to the inner wall of the tubular body 11 and is connected to the liquid outlet 333 of the multi-power controller 3 via an oil pipe. The other end is fixedly connected to the propulsion plug 21. The return spring 22 is sleeved on the outside of the hydraulic rod 23, with one end fixedly connected to the propulsion plug 21 and the other end fixedly connected to the inner wall of the tube body 11. The plunger-type propulsion device 2 with two different forms of power sources can ensure the stability of propulsion during the propulsion process and ensure the stability and uniformity of grouting.

[0033] like Figure 4As shown, the multi-power controller 3 is an integrally molded component, sealed and fixed to the end of the anti-backflow grouting pipe 1 away from the slurry outlet 13. The multi-power controller 3 includes a power switching control component, a power transmission pipeline, and a pressure monitoring device. The power switching control component includes a multi-power switching switch 311 and a pressure control switch 312. The multi-power switching switch 311 is used to switch between hydraulic power and pneumatic power, and the pressure control switch 312 is used to adjust the hydraulic oil pressure and air pressure, thereby achieving precise control of the grouting process and improving grouting efficiency and quality. The power transmission pipeline includes a hydraulic oil pipeline 331 and a high-pressure gas pipeline 332. The hydraulic oil pipeline 331 is provided in conjunction with the hydraulic rod 23. The hydraulic oil pipeline 331 has a liquid inlet 334 connected to the hydraulic oil tank, and a liquid outlet 333 connected to the hydraulic rod 23. The high-pressure gas pipeline 332 has an air inlet 336 connected to the high-pressure air duct, and an air outlet 335 directly connected to the pipe body 11. The sealed air injection space is formed between the multi-power controller 3 and the thrust plug 21. The multi-power switch 311 and pressure control switch 312 are both installed on the hydraulic oil pipeline 331 and the high-pressure gas pipeline 332. The pressure monitoring device includes a double-needle pressure gauge 322, connected to the hydraulic oil pipeline 331 and the high-pressure gas pipeline 332 via parallel pipes. It is used to monitor the hydraulic oil pressure and gas pressure, and thus reflect the pressure changes during the grouting process.

[0034] The pressure monitoring device also includes a data processing module 321; the data processing module 321 is connected to the pressure gauge 322, the multi-power switching switch 311, and the pressure control switch 312. The data processing module 321 is used to detect and collect data from the pressure gauge 322, process it, and automatically control the multi-power switching switch 311 and the pressure control switch 312. Specifically, by integrating a digital module such as a single-chip microcomputer into the pressure gauge 322, the pressure gauge 322 monitors the pressure data within the hydraulic oil pipeline 331 and the high-pressure gas pipeline 332 and feeds it back to the data processing module 321. When using pneumatic propulsion, if propulsion is difficult, the pressure within the high-pressure gas pipeline 332 increases because the propulsion plug 21 cannot move forward or moves slowly. The pressure changes monitored by the pressure gauge 322 can indirectly reflect the changes in resistance during the propulsion process. When the resistance reaches a certain threshold, the data processing module 321 controls the multi-power switching switch 311 to switch to hydraulic power and adjusts the hydraulic oil pressure according to the resistance through the pressure control switch 312. The pressure changes are then continuously monitored. When the resistance decreases to a certain threshold, the pneumatic power is switched. The intelligent design of the data processing module 321 can realize automatic control and monitoring, thereby improving the degree of automation and operational convenience of the grouting process.

[0035] like Figure 1As shown, the hopper 4 is positioned above one end of the tube body 11 near the slurry outlet 13 and is connected to the inner cavity of the tube body 11 via a discharge port 42. A double-screw agitator 41 is mounted at the discharge port 42 of the hopper 4. The double-screw agitator 41 is secured to the hopper 4 via a crossbeam. Specifically, a threaded connection is provided on the tube body 11 near the slurry outlet 13, through which the hopper 4 is detachably and fixedly connected to the tube body 11.

[0036] like Figure 1 As shown, the bracket 5 is positioned below the pipe body 11 to support it. The bracket 5 comprises three three-section sleeve legs 51, each of which is fitted with a fixing plate 52 and a non-slip rubber foot pad 53 at the bottom. Specifically, a threaded interface is provided below the pipe body 11, through which the bracket 5 is removably and fixedly connected to the pipe body 11. A convenient handle 6 is also provided below the pipe body 11 to facilitate grouting operations.

[0037] like Figure 5 As shown, when using this grouting equipment, first screw the bracket 5 onto the dedicated interface of the anti-backflow grouting pipe 1. Open the bracket 5, adjust the legs 51 to the appropriate height, and secure them with the fixing plate 52. Then, screw the hopper 4 onto the dedicated interface of the anti-backflow grouting pipe 1. Determine the working surface to be grouted, securely install a grouting conduit 7 of appropriate diameter at the grouting orifice 8, and place the grouting conduit 7 at the designated grouting location. Add static expansion agent ash and water in proportion to the hopper 4. Turn on the double-screw agitator 41 to fully stir the static expansion agent slurry, and you are ready for grouting. Depending on the viscosity of the slurry and the required injection rate, choose to use pneumatic or hydraulic power as the primary power source. Install a high-pressure air duct at the air inlet 336 of the high-pressure gas pipeline 332, or install a hydraulic oil tank at the liquid inlet 334 of the hydraulic oil pipeline 331. Use a double-needle pressure gauge 322 to monitor the hydraulic oil pressure or air pressure, thereby monitoring whether the pressure inside the anti-backflow grouting pipe 1 is normal.

[0038] Taking the case of a high slurry viscosity as an example, after all pre-grouting installation and inspection measures are completed, the multi-power switch 311 is pressed to open the hydraulic rod 23 and the hydraulic oil pipeline 331, selecting hydraulic power as the driving force, and selecting an appropriate pressure through the pressure control switch 312. At this time, the valve of the high-pressure gas pipeline 332 is slightly opened, and the pressure control switch 312 on the high-pressure gas pipeline 332 is finely adjusted to provide a micro-pressure power, thereby ensuring that the push plug 21 can be normally advanced. The push plug 21 moves forward under the action of the hydraulic pressure, and the high-pressure gas passes through the check valve 12 and reaches the bottom of the hopper 4. Under the combined effects of the double-screw agitator 41, gravity, and thrust, the slurry falls into the anti-backflow grouting pipe 1. Under the thrust generated by the thrust plug 21, the slurry flows through the slurry outlet 13 and the grouting conduit 7 to the predetermined grouting point. After the injected slurry overflows the grouting orifice 8, the grouting is completed, the grouting conduit 7 is removed, and the area around the grouting orifice 8 is cleaned. The above steps are repeated to grout the next grouting hole to be pre-cracked until the entire grouting process is completed. If the viscosity of the slurry decreases during the grouting process and the grouting resistance decreases, the high-pressure gas pipeline 332 valve can be fully opened by the multi-power switching switch 311, and the air pressure power is switched to the main driving force. The appropriate pressure is selected by the pressure control switch 312. At the same time, the pressure control switch 312 on the hydraulic oil pipeline 331 is finely adjusted to provide micro-hydraulic power to assist the movement of the thrust plug 21. If the grouting resistance increases again, the hydraulic power is switched as described above.

[0039] Since the hopper 4 is installed on the upper part of the anti-backflow grouting pipe 1 and is designed to be close to the front end, the propulsion path of the slurry is greatly reduced, which reduces the friction during the flow of the slurry and prevents the adhesion of the slurry during the propulsion process. While reducing the loss of slurry, it also reduces the friction resistance of the propulsion plug 21 during the propulsion process. The setting of the check valve 12 allows only gas to pass through and prevents the slurry from flowing back. The installation position of the multi-power controller 3, the hopper 4 and the setting of the check valve 12 enable the equipment to better meet the requirements of different working environments and the viscosity of the slurry, and expand the scope of use of the equipment. The threaded installation of the hopper 4 and the bracket 5 can improve the portability of the equipment, making it convenient to carry and operate in a wider and more complex working environment.

[0040] The above description of the disclosed embodiments will enable one skilled in the art to implement and use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be construed in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A portable pressure-injection grouting device for hard rock expansion fracturing, characterized in that: It comprises an anti-backflow grouting pipe (1), a plunger-type propulsion device (2), a multi-power controller (3), a hopper (4) and a bracket (5); The anti-backflow grouting pipe (1) comprises a pipe body (11), a check valve (12) and a one-way air guide valve (15); one end of the pipe body (11) is sealed and fixedly connected to the multi-power controller (3), and the other end is provided with a slurry outlet (13) connected to the grouting conduit (7); the plunger-type propulsion device (2) is provided in the pipe body (11) at one end close to the multi-power controller (3); the check valve (12) is fixedly installed along the cross section of the pipe body (11) at one end inside the pipe body (11) close to the slurry outlet (13); an air guide opening (16) is provided on the pipe body (11) between the check valve (12) and the plunger-type propulsion device (2), and the one-way air guide valve (15) is installed in the air guide opening (16); The plunger-type propulsion device (2) comprises a propulsion plug (21), a hydraulic rod (23) and a return spring (22); the propulsion plug (21) is movably arranged in the tube body (11) and matches the cross section of the tube body (11); the hydraulic rods (23) are at least two symmetrically arranged, one end of each hydraulic rod (23) is fixedly connected to the inner wall of the tube body (11) and connected to the liquid outlet (333) of the multi-power controller (3) through an oil pipe, and the other end is fixedly connected to the propulsion plug (21); the return spring (22) is sleeved outside the hydraulic rod (23), one end is fixedly connected to the propulsion plug (21), and the other end is fixedly connected to the inner wall of the tube body (11); The multi-power controller (3) is an integrally formed component, sealed and fixed to one end of the anti-backflow grouting pipe (1) away from the slurry outlet (13); the multi-power controller (3) comprises a power switching control component, a power transmission pipeline and a pressure monitoring device; the power switching control component comprises a multi-power switching switch (311) and a pressure control switch (312); the multi-power switching switch (311) is used to switch between hydraulic power and pneumatic power; the pressure control switch (312) is used to adjust the hydraulic oil pressure and the air pressure; the power transmission pipeline comprises a hydraulic oil pipeline (331) and a high-pressure gas pipeline (332), the hydraulic oil pipeline (331) are at least two devices arranged in conjunction with the hydraulic rod (23), the liquid outlet (333) of the hydraulic oil pipeline (331) is connected to the hydraulic rod (23); the gas outlet (335) of the high-pressure gas pipeline (332) is communicated with the pipe body (11); the multi-power switching switch (311) and the pressure control switch (312) are both installed on the hydraulic oil pipeline (331) and the high-pressure gas pipeline (332); the pressure monitoring device includes a pressure gauge (322), which is connected to the hydraulic oil pipeline (331) and the high-pressure gas pipeline (332) through parallel pipelines and is used to monitor the hydraulic oil pressure and gas pressure; The hopper (4) is arranged above one end of the tube body (11) close to the pulp outlet (13), and is connected to the inner cavity of the tube body (11) through the outlet (42); The bracket (5) is arranged below the tube body (11) to support the tube body (11).

2. The portable pressure-injection grouting equipment for hard rock expansion fracturing according to claim 1, characterized in that: The pressure monitoring device further comprises a data processing module (321); the data processing module (321) is connected to the pressure gauge (322), the multi-power switching switch (311), and the pressure control switch (312), and is used to collect and process data from the pressure gauge (322), and automatically control the multi-power switching switch (311) and the pressure control switch (312).

3. The portable pressure-injection grouting equipment for hard rock expansion fracturing according to claim 1, characterized in that: The tube body (11) is provided with a threaded interface at the upper and lower positions near the pulp outlet (13); the hopper (4) and the bracket (5) are detachably fixedly connected to the tube body (11) via the threaded interfaces.

4. The portable pressure-injection grouting equipment for hard rock expansion fracturing according to claim 3, characterized in that: A double-screw stirrer (41) is installed at the discharge port (42) of the hopper (4).

5. The portable pressure-injection grouting equipment for hard rock expansion fracturing according to claim 3, characterized in that: The bracket (5) comprises three three-section sleeve legs (51), each section of the legs is provided with a fixing plate buckle (52), and a non-slip rubber foot pad (53) is provided at the bottom.

6. The portable pressure-injection grouting equipment for hard rock expansion fracturing according to claim 1, characterized in that: The one-way air guide valve (15) comprises a valve flap (151) and a damping pin (152); during the advancement of the thrust plug (21), the valve flap (151) of the one-way air guide valve (15) is in a closed state under the action of the damping pin (152); during the return stroke of the thrust plug (21), the pipe body (11) is in a negative pressure state, and the valve flap (151) opens.

7. The portable pressure-injection grouting equipment for hard rock expansion fracturing according to claim 1, characterized in that: The pushing plug (21) is provided with a protrusion (24), and the inner wall of the tube body (11) is provided with a long groove (14) matching with the protrusion (24) along the extending direction of the tube body (11).

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