Reinforced fiber added concrete spraying device
The fiber-reinforced concrete spraying device composed of a fiber conveying device and a high-pressure air source solves the problems of fiber agglomeration and nozzle clogging, realizes efficient and safe fiber-sprayed concrete construction, and improves construction quality and reinforcement effect.
Patent Information
- Application Number
- CN202511058044.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-30
- Publication Date
- 2025-09-23
AI Technical Summary
In the prior art, longer reinforcing fibers tend to aggregate during the concrete spraying process, causing clogging and affecting construction efficiency and project quality.
The reinforced fiber concrete spraying device consists of a fiber conveying device and a high-pressure air source. The high-pressure air is used to mix and transport the reinforced fibers, and the gear and gravity pressure plate system is used to prevent the fibers from agglomerating. The high-pressure air source is used to control the spraying amount of the fibers. Combined with a wet or dry sprayer, the synchronous spraying of the fibers and concrete is achieved.
It effectively avoids fiber agglomeration and clogging, improves construction efficiency and project quality, and ensures the convenience, safety and reliability of high-toughness shotcrete.
Smart Images
Figure CN120683856A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a reinforced fiber added concrete spraying device, which can uniformly spray longer reinforced fibers and concrete to form a reinforcement layer, and belongs to the technical field of spraying devices. Background Art
[0002] Shotcrete technology is widely used in surface reinforcement projects such as geotechnical engineering, mining, construction, and geological disaster management. It has the advantages of convenient construction, low cost, and high efficiency. The process is divided into two methods: dry method and wet method. The dry method is to use high-pressure gas to transport the concrete mixture without water through a pipe to the spray gun and spray it out. After mixing with high-pressure water mist at the nozzle, it is sprayed onto the surface of the object to form a reinforcement layer. The wet method is to use a special wet concrete injection pump to transport the wet concrete slurry that has been mixed with water through a pipe to the spray gun and spray it directly onto the surface of the object to form a reinforcement layer. The powder mist sprayed during dry method construction is greatly affected by wind, has high rebound losses, and is seriously polluting. Therefore, it is gradually being eliminated in industries such as mining. However, its equipment is cheap and easy to operate, and it is still used to a certain extent.
[0003] Because concrete reinforcements are highly rigid but have low toughness, deformation of the reinforced material often causes the concrete reinforcement layer to crack and fall off, rendering the reinforcement ineffective. High-toughness concrete, a promising new development in recent years, incorporates reinforcing fibers to overcome the low toughness of the concrete reinforcement layer. However, the addition of reinforcing fibers impairs the workability of the concrete slurry, forcing the use of only very short fibers. Longer fibers will clumping during mixing and clogging during spraying, severely impacting construction efficiency and project quality. Therefore, designing a concrete spraying device capable of adding longer reinforcing fibers is essential. Summary of the Invention
[0004] The purpose of the present invention is to provide a fiber reinforced concrete spraying device to address the shortcomings of the existing technology, so as to prevent the fiber reinforced concrete from agglomerating and clogging during the concrete spraying process, thereby improving construction efficiency and project quality.
[0005] To achieve the above object, the present invention adopts the following technical solutions: A device for spraying reinforced fiber concrete, comprising a fiber conveying device and a concrete sprayer, wherein the fiber conveying device comprises a fiber pump tank coaxial with each other and a gravity pressure plate, a sleeve and a vertical shaft installed inside the fiber pump tank and coaxial with the fiber pump tank, the exhaust port at the top of the fiber pump tank is connected to the concrete sprayer through a high-pressure hose, the lower end of the vertical shaft is fixedly connected to the bottom of the fiber pump tank, the sleeve is rotatably sleeved on the outside of the vertical shaft through a bearing, and a fan blade is fixed on the upper end of the sleeve, the gravity pressure plate is loosely sleeved on the outside of the sleeve through its center hole and slidably connected to the vertical slide rail on the side wall of the sleeve, the outer edge of the gravity pressure plate is in sliding contact with the inner wall of the fiber pump tank, and the reinforced fiber is stored below the gravity pressure plate, a vertical through hole is provided on the gravity pressure plate, a gear is installed in the through hole, and the axis of the gear is perpendicular to the axis of the vertical shaft, a high-pressure air inlet nozzle is installed on the side wall of the fiber pump tank, the air inlet of the high-pressure air inlet nozzle is connected to the high-pressure air source, and the air outlet is opposite to the fan blade.
[0006] In the above-mentioned reinforced fiber concrete spraying device, the vertical slide rail is a vertical paddle fixed on the side wall of the sleeve, and the vertical paddle is slidably inserted into the vertical slide groove on the central hole wall of the gravity pressure plate.
[0007] In the above-mentioned fiber reinforced concrete spraying device, the high-pressure air source is an air compressor.
[0008] In the above-mentioned reinforced fiber concrete spraying device, the fiber pump tank is formed by connecting a tank cap and a tank body, and the tank cap and the tank body are connected together through a quick disassembly and assembly mechanism.
[0009] The above-mentioned fiber reinforced concrete spraying device has a plurality of gears which are evenly distributed around the axis of the gravity pressure plate.
[0010] The above-mentioned reinforced fiber concrete spraying device is a wet sprayer, which includes a wet concrete sprayer and a wet spray gun. The high-pressure gas inlet of the wet concrete sprayer is connected to the high-pressure gas source through a high-pressure gas pipe. The wet spray gun is provided with a wet material inlet, a fiber inlet, a wet material nozzle connected to the wet material inlet, and a fiber nozzle connected to the fiber inlet. The discharge port of the wet concrete sprayer is connected to the wet material inlet of the wet spray gun through a material delivery pipeline; the fiber inlet of the wet spray gun is connected to the exhaust port at the top center of the fiber pump tank through a high-pressure hose.
[0011] In the above-mentioned reinforced fiber concrete spraying device, the wet material nozzle of the wet spray gun is an annular nozzle, and the fiber nozzle is located in the middle of the wet material nozzle.
[0012] The above-mentioned reinforced fiber concrete spraying device, the concrete sprayer is a dry sprayer, the dry sprayer includes a dry concrete sprayer, a dry spray gun and a high-pressure water pump, the high-pressure gas inlets of the dry concrete sprayer and the high-pressure water pump are connected to the high-pressure gas source through a high-pressure air pipe, the dry spray gun is provided with a dry material inlet, a fiber inlet, a high-pressure water inlet, a dry material nozzle connected to the dry material inlet, a fiber nozzle connected to the fiber inlet and a high-pressure water nozzle connected to the high-pressure water inlet, the dry material inlet of the dry spray gun is connected to the discharge port of the dry concrete sprayer through a material delivery pipeline, the fiber inlet of the dry spray gun is connected to the exhaust port at the top center of the fiber pump tank through a high-pressure hose, and the high-pressure water inlet of the dry spray gun is connected to the water outlet at the lower part of the side wall of the high-pressure water pump through a high-pressure water pipe.
[0013] In the above-mentioned reinforced fiber concrete spraying device, the dry material nozzle and high-pressure water nozzle of the dry spray gun are both annular nozzles, the fiber nozzle is located in the middle of the dry material nozzle, and the dry material nozzle is located in the middle of the high-pressure water nozzle.
[0014] The above-mentioned reinforced fiber concrete spraying device has an upper high-pressure air chamber and a lower high-pressure water chamber inside the shell of the high-pressure water pump. The high-pressure air chamber is connected to the high-pressure air source through a high-pressure air pipe, and the high-pressure water chamber is connected to the high-pressure water inlet of the dry spray gun through a high-pressure water pipe. A water inlet valve is provided on the side wall of the shell of the high-pressure water pump.
[0015] The present invention utilizes a fiber conveying device to fully mix the reinforcing fibers with high-pressure air and then conveys the mixture to a concrete sprayer. The concrete sprayer then simultaneously sprays the reinforcing fibers and concrete slurry from different channels onto the surface of the object to be reinforced. This effectively avoids the phenomenon of long fibers agglomerating and clogging the spray gun during concrete mixing, thereby greatly improving construction efficiency and project quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0017] Figure 1 This is a structural schematic diagram of the wet-type reinforced fiber concrete spraying device of the present invention; Figure 2 This is a structural schematic diagram of the dry-type reinforced fiber concrete spraying device of the present invention; Figure 3 for Figure 1 and Figure 2 AA section view in; Figure 4 for Figure 1 and Figure 2 BB cross-sectional view in; Figure 5 for Figure 4 The CC section view in the figure; Figure 6 for Figure 1 D-direction view in; Figure 7 for Figure 2 E-direction view in.
[0018] The numbers in the figure are as follows: 1. Fiber pump tank; 2. Gear; 3. Gravity pressure plate; 4. Quick disassembly and assembly mechanism; 5. Casing; 6. Vertical shaft; 7. Fan blade; 8. High-pressure air inlet nozzle; 9. Bearing; 10. High-pressure air source; 11. Dry concrete spraying machine; 12. High-pressure water pump; 13. Water inlet valve; 14. Dry spray gun; 15. Dry material nozzle; 16. Fiber nozzle; 17. High-pressure water nozzle; 18. Wet concrete spraying machine; 19. Wet spray gun; 20. Wet material nozzle; 21. Wheel axle; 22. Gear; 23. Vertical slide rail. DETAILED DESCRIPTION
[0019] The present invention provides a concrete spraying device for adding reinforcing fibers, which can flexibly and controllably add longer reinforcing fibers to the sprayed concrete while avoiding agglomeration during stirring and clogging during spraying, thereby making the construction of high-toughness sprayed concrete more convenient, safer and more reliable.
[0020] See Figure 1 and Figure 2 The present invention mainly includes a fiber conveying device, a high-pressure air source 10 and a concrete sprayer, wherein the concrete sprayer can be a wet sprayer or a dry sprayer. The wet sprayer, the fiber conveying device and the high-pressure air source 10 form a wet reinforced fiber concrete spraying device (such as Figure 1 As shown), the dry-type sprayer, the fiber conveying device, and the high-pressure gas source 10 form a dry-type reinforced fiber concrete spraying device (as shown Figure 2 As shown). The high-pressure gas source 10 is an air compressor.
[0021] The fiber conveying device mainly includes a fiber pump tank 1, a gear 2, a gravity pressure plate 3, a sleeve 5, a vertical shaft 6, a fan blade 7 and a high-pressure air inlet nozzle 8. The fiber pump tank 1 is cylindrical in shape and is placed vertically. The exhaust port at the top center is connected to the concrete sprayer through a high-pressure hose. The vertical shaft 6 is located inside the fiber pump tank 1 and is coaxial with the fiber pump tank 1. The lower end of the vertical shaft 6 is fixedly connected to the bottom of the fiber pump tank 1. The sleeve 5 is coaxially sleeved on the outside of the vertical shaft 6 and is rotatably connected to the vertical shaft 6 through a bearing 9, and can rotate freely around the vertical shaft 6. The gravity pressure plate 3 is loosely sleeved on the outside of the sleeve 5 through its center hole. A vertical slide rail 23 is provided on the side wall of the sleeve 5. The vertical slide rail 23 is a vertical pick fixed on the side wall of the sleeve 5. The vertical pick slides into the vertical slide groove on the center hole wall of the gravity pressure plate 3. The gravity pressure plate 3 can slide up and down along the sleeve 5 and the vertical paddle. When the sleeve 5 rotates around the vertical shaft 6, the gravity pressure plate 3 can be driven to rotate synchronously by the vertical paddle. The outer edge of the gravity pressure plate 3 slides in contact with the inner wall of the fiber pump tank 1. The gravity pressure plate 3 divides the cavity of the fiber pump tank 1 into two parts. The part above the gravity pressure plate 3 is the fiber-gas mixing chamber, and the part below the gravity pressure plate 3 is the fiber storage chamber. The fiber storage chamber is used to store reinforcing fibers. A vertical through hole is provided on the gravity pressure plate 3. The gear 2 is installed in the through hole via an axle 21. One end of the axle 21 is perpendicular to the axis of the vertical shaft 6, that is, the axis of the gear 2 intersects the axis of the vertical shaft 6 at right angles. When the gravity pressure plate 3 rotates, the gear 2 rolls on top of the reinforcing fibers, and the gear teeth 22 of the gear 2 bring the reinforcing fibers under the gravity pressure plate 3 to the fiber-gas mixing chamber. The fan blades 7 are fixed to the upper end of the sleeve 5, and the high-pressure air inlet nozzle 8 is installed on the side wall of the fiber pump tank 1. The air inlet of the high-pressure air inlet nozzle 8 is connected to the high-pressure air source 10 through a high-pressure air pipe. The air outlet of the high-pressure air inlet nozzle 8 is opposite to the fan blades 7. When the high-pressure air inlet nozzle 8 sprays air, it can drive the fan blades 7 to rotate, and then drive the gravity pressure plate 3 to rotate synchronously through the sleeve 5. The high-pressure air source 10 is connected to the concrete sprayer through a high-pressure air pipe.
[0022] See Figure 1 The wet sprayer includes a wet concrete sprayer 18 and a wet spray gun 19. The high-pressure gas inlet of the wet concrete sprayer 18 is connected to the high-pressure gas source 10 through a high-pressure gas pipe. The wet spray gun 19 is provided with a wet material inlet, a fiber inlet, a wet material nozzle 20 connected to the wet material inlet, and a fiber nozzle 16 connected to the fiber inlet. The discharge port of the wet concrete sprayer 18 is connected to the wet material inlet of the wet spray gun 19 through a material delivery pipeline; the fiber inlet of the wet spray gun 19 is connected to the exhaust port at the top center of the fiber pump tank 1 through a high-pressure hose.
[0023] See Figure 6 The wet material nozzle 20 of the wet spray gun 19 is an annular nozzle, and the fiber nozzle 16 is located in the middle of the wet material nozzle 20.
[0024] See Figure 2The dry sprayer includes a dry concrete sprayer 11, a dry spray gun 14, and a high-pressure water pump 12. The high-pressure gas inlets of the dry concrete sprayer 11 and the high-pressure water pump 12 are connected to the high-pressure gas source 10 via high-pressure gas pipes. The dry spray gun 14 is equipped with a dry material inlet, a fiber inlet, a high-pressure water inlet, a dry material nozzle 15 connected to the dry material inlet, a fiber nozzle 16 connected to the fiber inlet, and a high-pressure water nozzle 17 connected to the high-pressure water inlet. The dry material inlet of the dry spray gun 14 is connected to the discharge port of the dry concrete sprayer 11 via a material delivery pipeline. The fiber inlet of the dry spray gun 14 is connected to the exhaust port at the top center of the fiber pump tank 1 via a high-pressure hose. The high-pressure water inlet of the dry spray gun 14 is connected to the water outlet at the lower side wall of the high-pressure water pump 12 via a high-pressure water pipe. A water inlet valve 13 is provided on the side wall of the high-pressure water pump 12.
[0025] See Figure 7 The dry material nozzle 15 and the high-pressure water nozzle 17 of the dry spray gun 14 are both annular nozzles, the fiber nozzle 16 is located in the middle of the dry material nozzle 15, and the dry material nozzle 15 is located in the middle of the high-pressure water nozzle 17.
[0026] The fiber pump tank 1 uses high-pressure air from the high-pressure air source 10 to push the fan blades 7 installed inside it and drive the gravity pressure plate 3 to rotate, thereby causing the gear 2 on the gravity pressure plate 3 to rotate. The gear teeth 22 of the gear 2 bring the reinforcing fibers under the gravity pressure plate 3 to its upper part, and then under the joint stirring of the high-pressure air and the fan blades 7, it becomes a uniform reinforced fiber mixed with high-pressure air. For a wet sprayer, this mixed high-pressure air is connected to the wet spray gun 19 through a high-pressure hose, and is fully mixed with the wet concrete slurry sprayed from the wet material nozzle 20 at the fiber nozzle 16, and then sprayed onto the surface of the object to be reinforced, thereby forming a fiber-enhanced sprayed concrete reinforcement layer. For a dry sprayer, this mixed high-pressure air is connected to the dry spray gun 14 through a high-pressure hose, and is fully mixed with the dry concrete slurry sprayed from the dry material nozzle 15 and the high-pressure water mist sprayed from the high-pressure water nozzle 17 at the fiber nozzle 16, and then sprayed onto the surface of the object to be reinforced.
[0027] The structure of the wet concrete spraying machine 18 is the same as that of a conventional wet concrete spraying machine (such as the TK700 wet spraying machine). Concrete slurry is generated by a pump within the wet concrete spraying machine 18 . High-pressure air from a high-pressure air source 10 is then delivered through a pipeline to a wet spray gun 19 , where it is sprayed out through a wet material nozzle 20 .
[0028] The structure of the dry concrete sprayer 11 is similar to that of conventional dry concrete sprayers (such as the PZ series PZ-3, PZ-5, PZ-6, and PZ-6F, and the PZG explosion-proof series PZG-5 / 7C / 9C). Dry concrete is generated by a pump within the dry concrete sprayer 11. High-pressure air from a high-pressure air source 10 is then delivered via a pipe to a dry concrete spray gun 14 and sprayed out through a dry concrete nozzle 15. High-pressure water mist is generated by a high-pressure water pump 12 and delivered via a high-pressure water pipe to the dry concrete spray gun 14 and sprayed out through a high-pressure water nozzle 17.
[0029] The fiber pump tank 1 is composed of a tank cap and a tank body, which are connected together by a quick disassembly mechanism 4, which facilitates the disassembly and maintenance of the fiber conveying device. The quick disassembly mechanism 4 can be a snap connection structure, or a threaded connection or a pin connection.
[0030] The high-pressure air inlet nozzle 8 is installed on one side of the fiber pump tank 1, and its jet angle is tilted downward and sideways so that the fan blade 7 can obtain a larger rotation speed and the reinforcing fiber can obtain greater kinetic energy.
[0031] A plurality of gears 2 are evenly mounted on the gravity pressure plate 3 via a wheel shaft 21. When the gravity pressure plate 3 rotates with the fan blades 7, the gears 2 also rotate under the friction with the reinforcing fibers thereunder, and during rotation, the gear teeth 22 bring the reinforcing fibers from the fiber storage cavity at the bottom to the fiber-air mixing cavity above the gravity pressure plate 3.
[0032] The interior of the high-pressure water pump 12 is divided into an upper high-pressure air chamber and a lower high-pressure water chamber. The sidewall of the housing is connected to the water inlet pipe via a water inlet valve 13, and is connected to the high-pressure air source 10 via a high-pressure air pipe. The high-pressure air output by the high-pressure air source 10 provides pressure for the water, thus generating high-pressure water. The high-pressure water is connected to the dry spray gun 14 via the high-pressure water pipe.
[0033] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a fiber conveying device, a high-pressure air source 10 and a concrete sprayer, thereby achieving the goal of flexibly and controllably adding longer high-strength fibers to the sprayed concrete while avoiding agglomeration during stirring and clogging during spraying, thereby making the construction of high-toughness sprayed concrete more convenient, safe and reliable, and improving the toughness of the concrete reinforcement layer.
[0034] The present invention uses high-pressure air as power and controls the amount of reinforcing fiber mixed in by controlling the rotation speed of the gear 2, and its rotation speed can be conveniently adjusted by the air pressure of the high-pressure air.
[0035] In the dry fiber-reinforced concrete spraying device, a high-pressure air source 10 is the sole power source, providing power to the fiber pump tank 1, dry concrete sprayer 11, and high-pressure water pump 12. By adjusting the air pressure and air volume of each pipeline, the mixing ratio of dry concrete, water, and reinforcing fiber can be easily adjusted. The modular design of each component facilitates use, maintenance, and transportation.
[0036] In the wet-type reinforced fiber concrete spraying device, the modification can be completed by simply replacing the spray gun, adding a fiber pump tank 1 and a low-power air compressor. Therefore, the present invention is particularly suitable for modifying existing ordinary concrete spraying machines.
Claims
1. A reinforced fiber concrete spraying device, characterized in that: The invention comprises a fiber conveying device and a concrete sprayer, wherein the fiber conveying device comprises a coaxial fiber pump tank (1) and a gravity pressure plate (3), a sleeve (5) and a vertical shaft (6) installed inside the fiber pump tank (1) and coaxial with the fiber pump tank (1); the exhaust port at the top of the fiber pump tank (1) is connected to the concrete sprayer through a high-pressure hose; the lower end of the vertical shaft (6) is fixedly connected to the bottom of the fiber pump tank (1); the sleeve (5) is rotatably sleeved on the outside of the vertical shaft (6) through a bearing (9); a fan blade (7) is fixed to the upper end of the sleeve (5); the gravity pressure plate (3) The center hole of the gravity pressure plate (3) is loosely sleeved on the outside of the sleeve (5) and is slidably connected to the vertical slide rail (23) on the side wall of the sleeve (5). The outer edge of the gravity pressure plate (3) is in sliding contact with the inner wall of the fiber pump tank (1). The reinforcement fiber is stored below the gravity pressure plate (3). A vertical through hole is provided on the gravity pressure plate (3). A gear (2) is installed in the through hole and the axis of the gear (2) is perpendicular to the axis of the vertical shaft (6). A high-pressure air inlet nozzle (8) is installed on the side wall of the fiber pump tank (1). The air inlet of the high-pressure air inlet nozzle (8) is connected to the high-pressure air source (10), and the air outlet is opposite to the fan blade (7).
2. The fiber reinforced concrete spraying device according to claim 1, characterized in that: The vertical slide rail (23) is a vertical paddle fixed on the side wall of the sleeve (5), and the vertical paddle is slidably inserted into the vertical slide groove on the central hole wall of the gravity pressure plate (3).
3. The fiber reinforced concrete spraying device according to claim 2, characterized in that: The high-pressure gas source (10) is an air compressor.
4. The fiber reinforced concrete spraying device according to claim 3, characterized in that: The fiber pump tank (1) is formed by connecting a tank cap and a tank body, and the tank cap and the tank body are connected together via a quick disassembly and assembly mechanism (4).
5. The fiber reinforced concrete spraying device according to claim 4, characterized in that: A plurality of gears (2) are provided, and they are evenly distributed around the axis of the gravity pressure plate (3).
6. A reinforced fiber concrete spraying device according to any one of claims 1 to 5, characterized in that: The concrete sprayer is a wet sprayer, comprising a wet concrete sprayer (18) and a wet spray gun (19), wherein the high-pressure gas inlet of the wet concrete sprayer (18) is connected to the high-pressure gas source (10) via a high-pressure gas pipe, and the wet spray gun (19) is provided with a wet material inlet, a fiber inlet, a wet material nozzle (20) communicating with the wet material inlet, and a fiber nozzle (16) communicating with the fiber inlet, wherein the discharge port of the wet concrete sprayer (18) is connected to the wet material inlet of the wet spray gun (19) via a material delivery pipeline; and the fiber inlet of the wet spray gun (19) is connected to the exhaust port at the top center of the fiber pump tank (1) via a high-pressure hose.
7. The fiber reinforced concrete spraying device according to claim 6, characterized in that: The wet material nozzle (20) of the wet spray gun (19) is an annular nozzle, and the fiber nozzle (16) is located in the middle of the wet material nozzle (20).
8. A reinforced fiber concrete spraying device according to any one of claims 1 to 5, characterized in that: The concrete sprayer is a dry-type sprayer, comprising a dry-type concrete sprayer (11), a dry-type spray gun (14) and a high-pressure water pump (12). The high-pressure gas inlets of the dry-type concrete sprayer (11) and the high-pressure water pump (12) are connected to the high-pressure gas source (10) through a high-pressure gas pipe. The dry-type spray gun (14) is provided with a dry material inlet, a fiber inlet, a high-pressure water inlet, a dry material nozzle (15) connected to the dry material inlet, a fiber nozzle (16) connected to the fiber inlet, and a high-pressure water nozzle (17) connected to the high-pressure water inlet. The dry material inlet of the dry-type spray gun (14) is connected to the discharge port of the dry-type concrete sprayer (11) through a material delivery pipe. The fiber inlet of the dry-type spray gun (14) is connected to the exhaust port at the top center of the fiber pump tank (1) through a high-pressure hose. The high-pressure water inlet of the dry-type spray gun (14) is connected to the water outlet at the lower part of the side wall of the high-pressure water pump (12) through a high-pressure water pipe.
9. The fiber reinforced concrete spraying device according to claim 8, characterized in that: The dry material nozzle (15) and the high-pressure water nozzle (17) of the dry spray gun (14) are both annular nozzles, the fiber nozzle (16) is located in the middle of the dry material nozzle (15), and the dry material nozzle (15) is located in the middle of the high-pressure water nozzle (17).
10. The fiber reinforced concrete spraying device according to claim 9, characterized in that: The interior of the housing of the high-pressure water pump (12) is divided into an upper high-pressure air chamber and a lower high-pressure water chamber. The high-pressure air chamber is connected to the high-pressure air source (10) through a high-pressure air pipe, and the high-pressure water chamber is connected to the high-pressure water inlet of the dry spray gun (14) through a high-pressure water pipe. A water inlet valve (13) is provided on the side wall of the housing of the high-pressure water pump (12).