Dam foundation surface cleaning device

Abstract

A dam foundation surface cleaning device comprises an air supply system, a water supply system and a Y-pipe high-pressure spray gun. The air supply system comprises an air compressor, an air storage tank and an air distribution bag, the air compressor is connected with the air storage tank, a safety valve is installed on one side of an air storage tank body, and an air outlet of the air storage tank is connected with the air The water supply system comprises a water supply branch pipe and a water distribution bag, the tail end of the water supply branch pipe is connected with the water distribution bag and an air distribution bag, the water distribution bag is provided with a plurality of branch pipes, and each branch pipe is provided with a valve; the Y-pipe high-pressure spray gun comprises two inlets and an outlet, the two inlets are connected with branch pipes of the air distribution bag and the water distribution bag through an air supply hose and a water supply hose respectively, and the outlet is provided with an air-water atomization nozzle. The cleaning device saves water, is environmentally friendly, low in cost, flexible and simple to operate, capable of supporting synchronous operation of multiple spray guns, high in efficiency, safe and reliable, does not need to be provided with a large number of wool washing machine devices at the same time when the dam foundation surface is cleaned, can effectively reduce the project construction cost, and can avoid damage to weak bedrock of the dam.

Description

Technical fields:

[0001] This utility model belongs to the field of foundation surface cleaning construction technology for water conservancy and hydropower engineering, and specifically relates to a dam foundation surface cleaning device. Background technology:

[0002] After the dam foundation pit excavation was completed, the foundation surface cleaning work began. Currently, the dam foundation surface cleaning is usually done manually using a handheld high-pressure scrubbing machine. The scrubbing machine works by using high-pressure water jet technology to treat the bedrock and concrete surfaces, but this method has the following problems:

[0003] 1. Because the high-speed water jets sprayed by the screeding machine have a huge impact force, they are usually used on hard rock surfaces. However, the geological conditions of the dam foundation surface are relatively complex, including hard rock, soft rock, rock that is prone to mudification when exposed to water, and even overburden. For weak bedrock surfaces and foundation surfaces that are prone to mudification when exposed to water, the use of the screeding machine can easily damage the foundation surface and affect the quality of dam foundation construction. Therefore, the application range of the screeding machine is limited.

[0004] 2. The sizing machine uses a lot of water, and clean water is needed to wash the foundation surface of the dam. A large amount of wastewater will be generated during the construction process, which will increase the cost of water purification and wastewater treatment.

[0005] 3. Because cleaning the foundation surface of the dam requires a large number of workers and the construction area is densely populated, the pressure of the scabbing machine is prone to go out of control, causing casualties and resulting in poor safety.

[0006] 4. Typically, dam foundation surfaces have large areas. After excavation, due to water pressure and seepage damage, the foundation surface needs to be cleaned and sealed with a concrete bedding layer as soon as possible, and dam concrete construction should commence promptly. Due to time constraints, a large number of screeding machines are required in the early stages of the project to meet the intensity of foundation surface cleaning. During the dam concrete construction phase, because the dam typically has many structural joints, dividing it into multiple sections, each section's concrete is constructed independently with a smaller surface area. Only a small number of screeding machines are needed to meet the requirements, leading to a large number of screeding machines being idle in the early stages, resulting in resource waste and increased project construction costs. Utility Model Content:

[0007] To address the aforementioned issues, this invention proposes a novel dam foundation surface cleaning device that is adaptable to foundation surfaces with varying geological conditions, including hard rock, soft rock, and rocks that easily turn into mud when exposed to water, as well as overburden layers. This device effectively ensures the construction quality of the dam foundation surface, while also being water-saving, environmentally friendly, flexible and simple to operate, highly efficient, safe, and reliable, thereby effectively reducing project construction costs.

[0008] To achieve the above objectives, this utility model adopts the following technical solution:

[0009] This utility model provides a dam foundation surface cleaning device, which includes an air supply system, a water supply system, and a three-way high-pressure spray gun. The air supply system includes an air compressor, an air tank, an air distribution manifold, and air supply hoses. The air compressor is connected to the air tank through the air supply pipe. A safety valve is installed on one side of the air tank. The air outlet of the air tank is connected to the air distribution manifold through the air supply pipe. The air distribution manifold has multiple branch pipes, and each branch pipe has an independent valve. The water supply system includes a construction water supply pipeline, water supply branch pipes, a water distribution manifold, and water supply hoses. The construction water supply pipeline has water supply branch pipes, and the ends of the water supply branch pipes are connected to the water distribution manifold. The water distribution manifold has multiple branch pipes, and each branch pipe has an independent valve. The three-way high-pressure spray gun is connected to the air supply system and the water supply system. The three-way high-pressure spray gun includes two inlets and one outlet. The two inlets are connected to the branch pipes of the air distribution manifold and the water distribution manifold through the air supply hose and the water supply hose, respectively. The outlet is equipped with an air-water atomizing nozzle.

[0010] One air compressor is installed, with a discharge capacity of 20m³. 3 / min; The volume of the air receiver tank is selected according to the air compressor's discharge capacity, with an air receiver tank capacity of 6m³. 3 The rated pressure of the air tank is higher than or equal to the exhaust pressure of the air compressor, and the rated pressure of the air tank is 1.2 MPa.

[0011] The distance between the gas storage tank and the gas distribution manifold is ≥10m, and the gas distribution manifold is installed in a stable area 10m away from the dam foundation surface.

[0012] The gas distributor is made of Q345R steel plate or steel pipe welded together, with an epoxy resin anti-corrosion coating on the inner wall. The gas distributor has 6 interfaces with a diameter of 20mm. The gas distributor is equipped with 6 gas distributor branch pipes with a diameter of 20mm. The outlet of the gas distributor branch pipe is inclined downward at 5°. The valves installed on the gas distributor branch pipes are ball valves.

[0013] The water distribution manifold and the air distribution manifold are arranged in parallel with a spacing of 1.5m. The number of branch pipes of the water distribution manifold is the same as that of the air distribution manifold. The water distribution manifold has 6 interfaces with a diameter of 20mm. The water distribution manifold is equipped with 6 branch pipes with a diameter of 20mm. The valves installed on the branch pipes of the water distribution manifold are DN20 stop valves.

[0014] The number of the three-pronged high-pressure spray guns is configured according to the on-site construction intensity, with each gun having an exhaust volume of 20m³. 3 An air compressor with a capacity of / min can simultaneously activate 6 three-way high-pressure spray guns.

[0015] The three-pronged high-pressure spray gun has two inlets, including a water inlet pipe and an air inlet pipe. The water inlet pipe and the air inlet pipe are respectively equipped with a water inlet valve and an air inlet valve. The water inlet valve is a DN20 stop valve, and the air inlet valve is a DN20 ventilation butterfly valve.

[0016] The three-pronged high-pressure spray gun is constructed by welding galvanized steel pipes to form a three-pronged structure. The galvanized steel pipes have an outer diameter of 20mm and a wall thickness of 2mm. The angle between the three prongs is 36°, and the total length of the three-pronged high-pressure spray gun is 2.0m. A pressure gauge with a range of 0-2.0MPa is installed at the outlet of the three prongs of the three-pronged high-pressure spray gun.

[0017] The aforementioned air-water atomizing nozzle is a high-pressure stainless steel air-water atomizing nozzle with a nozzle diameter of 0.8mm and a pressure resistance of 2.0MPa.

[0018] The air supply pipe is an 80mm diameter high-pressure steel wire air supply pipe; the water supply branch pipe has a water supply pressure >1.0MPa and a diameter of 50mm; the air supply hose is a 20mm diameter high-pressure steel wire pipe with a pressure resistance of 1.5MPa; the water supply hose is a 20mm diameter PVC steel wire hose with a pressure resistance of 1.2MPa; the air supply hose, water supply hose and corresponding branch pipe and three-way pipe high-pressure spray gun inlet are connected by quick connectors.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This utility model is adaptable to the cleaning of dam foundation surfaces under different geological conditions (hard rock, soft rock, rocks that easily turn into mud when exposed to water, and even overburden layers, etc.). This utility model employs a water-pressure mixing method, mixing high-pressure gas and water. The atomized high-pressure gas is used to clean the dam foundation surface. By adjusting the water flow and air pressure according to engineering geological characteristics, the water-to-gas ratio is controlled to achieve the cleaning purpose of the dam foundation surface. For foundations with weak bedrock surfaces (sandstone, mudstone, overburden layers), only a small amount of water is used, with the main cleaning achieved through high-pressure gas. The sprayed water mist effectively reduces dust without causing mudification of the weak bedrock surface, effectively preventing damage to the dam's weak bedrock surface. This utility model is not only suitable for cleaning dam foundation surfaces but can also be widely applied to cleaning operations in other water conservancy and hydropower projects, construction projects, and mining operations.

[0021] 2. A typical 50MPa brushing machine consumes approximately 3.6m³ of water. 3 The current method requires clean water to clean the dam foundation surface, resulting in significant water waste. This invention utilizes high-pressure gas to clean the dam bedrock surface. The high-pressure gas and water consumption are adjusted according to different rock types. Generally, the water consumption of one unit does not exceed 1.0 m³ / h. 3The water consumption is very low, only about 1000 cubic meters per hour. Compared to a rinsing machine, using this invention to clean the base surface can effectively reduce the amount of water used in the project, save water resources, and also save on water treatment costs.

[0022] 3. This utility model has a simple structure, low cost, and is easy to operate and maintain. It is modified from common equipment and materials already available on the construction site, such as air compressors, construction water supply pipelines, air tanks, air distribution manifolds, water distribution manifolds, hoses, three-way pipes, valves, and high-pressure nozzles. There is no need to spend a lot of money to purchase equipment. Compared with purchasing a large number of scrubbing machines to clean the dam foundation surface, the use of this utility model greatly reduces the investment in scrubbing machine equipment, saves construction costs, and can process and produce in large quantities in a short period of time, effectively ensuring the project schedule.

[0023] 4. This utility model allows one air compressor to connect to multiple three-way high-pressure spray guns, typically with an exhaust volume of 20m³ / h. 3 An air compressor with a capacity of / min can connect to 6 three-pronged high-pressure spray guns. Due to the synchronous flushing design of multiple three-pronged high-pressure spray guns, the construction efficiency is greatly improved, and the cost of using a single three-pronged high-pressure spray gun is greatly reduced. Compared with using a scrubbing machine to clean the dam foundation surface, this utility model has high flushing and cleaning efficiency and low cost.

[0024] 5. This utility model employs an air storage tank for pressure regulation and balancing, ensuring higher safety. The equipment primarily uses high-pressure gas as the power source for cleaning the dam foundation surface. The high-pressure gas generated by the air compressor, passing through the air storage tank, buffers pressure fluctuations in the compressed air system, reducing frequent loading and unloading of the air compressor and maintaining stable system pressure. When the compressed air pressure output from the air compressor fluctuates significantly, the air storage tank can absorb some of the pressure fluctuations, making the pressure output to the gas-using equipment more stable.

[0025] 6. This utility model has good stability and durability, and can maintain a stable cleaning effect even when working continuously for a long time.

[0026] In summary, this utility model is water-saving and environmentally friendly, low-cost, flexible and simple to operate, supports simultaneous operation of multiple spray guns, is highly efficient, safe and reliable. Using this utility model for cleaning the foundation surface of a dam eliminates the need for a large number of roughening machines, effectively reducing project construction costs and preventing damage to the weak bedrock of the dam. Attached image description:

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the three-pronged high-pressure spray gun structure of this utility model.

[0029] Figure reference numerals:

[0030] 1: Air compressor; 2: Air supply pipe; 3: Air tank; 3-1: Safety valve; 4: Valve; 5: Water supply branch pipe; 6: Air manifold; 6-1: Air manifold branch pipe; 7: Water manifold; 8: Air supply hose; 9: Water supply hose; 10: Dam foundation surface; 11: Three-way high-pressure spray gun; 11-1: Steel pipe; 11-2: Water inlet valve; 11-3: Air inlet valve; 11-4: Pressure gauge; 11-5: Air-water atomizing nozzle; 11-6: Quick connector; 12: Atomized high-pressure air-water flow. Detailed implementation method:

[0031] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principle of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the protection scope of the present invention.

[0032] See Figures 1-2 This utility model provides a dam foundation surface cleaning device, which includes an air supply system, a water supply system, and a three-way high-pressure spray gun 11.

[0033] The air supply system includes an air compressor 1, an air tank 3, an air distributor 6, and air supply hoses 8. One air compressor 1 is installed, which can utilize existing equipment on-site; typically, a 20m³ / h air displacement unit is selected. 3 Air compressor 1 with a capacity of / min, and corresponding air tank 3 with a capacity of 6m³ 3 The volume of the air receiver 3 is selected based on the discharge capacity of the air compressor 1, calculated using the formula: V = N × Q ÷ (P + 1), where V is the volume, Q is the discharge capacity of the air compressor 1, P is the discharge pressure (unit: MPa), and N is the adjustment parameter (1-2 for stable air supply, 3-4 for larger fluctuations). The rated pressure of the air receiver 3 is not lower than the discharge pressure of the air compressor 1. The air compressor 1 is connected to the air receiver 3 via the air supply pipe 2. A safety valve 3-1 is installed on one side of the air receiver 3. The air outlet of the air receiver 3 is connected to the air distributor 6 via the air supply pipe 2, which is an 80mm diameter high-pressure steel wire air supply pipe. The air distributor 6 should be manufactured using high-quality materials with certain corrosion resistance. The joint strength of the material should be greater than the design requirements for the wall thickness of the air distributor 6. The larger the volume of the air distributor, the more stable the working air pressure inside. The installation location of the air distribution manifold 6 should be far away from vibration sources and placed in a stable and safe area. The connection between the air distribution manifold 6 and the pipeline should be level and consistent, and the pipeline should have a certain backward tilt angle when connecting to the air distribution manifold 6 to facilitate the removal of moisture from the air distribution manifold 6. The air distribution manifold 6 is equipped with multiple air distribution manifold branch pipes 6-1, each with an independent valve, which is a ball valve. For an exhaust volume of 20m³ / h... 3 For an air compressor 1 with a capacity of / min, based on experience, 6 air distribution manifold branches 6-1 can be installed on the air distribution manifold 6.

[0034] The water supply system includes a construction water supply pipeline, water supply branch pipes 5, water distribution manifolds 7, and water supply hoses 9. Water supply branch pipes 5 are installed on the construction water supply pipeline, with their ends connected to water distribution manifolds 7. Multiple water distribution manifold branch pipes are installed on water distribution manifolds 7, the number of which should match the number of water distribution manifold branch pipes 6-1. Each water distribution manifold branch pipe is equipped with an independent valve, which is a DN20 stop valve. The water supply for this cleaning device is provided through water supply branch pipes 5 connected to water distribution manifolds 7. Before the cleaning work on the dam foundation surface 10, water supply branch pipes 5 need to be extended to the vicinity of the dam foundation surface 10, and water distribution manifolds 7 need to be installed on water supply branch pipes 5 so that multiple three-way high-pressure spray guns 11 can be connected.

[0035] The three-way high-pressure spray gun 11 is connected to the air supply system and water supply system. The number of three-way high-pressure spray guns 11 is configured according to the on-site construction intensity, with each gun having an exhaust volume of 20m³. 3 The air compressor 1 with a capacity of 1 / min can simultaneously operate up to 6 three-way high-pressure spray guns 11. Each three-way high-pressure spray gun 11 includes two inlets and one outlet. The two inlets include a water inlet pipe and an air inlet pipe, which are connected to the branch pipes of the air distribution manifold 6 and water distribution manifold 7 respectively via air supply hose 8 and water supply hose 9. The water inlet pipe and air inlet pipe are respectively equipped with a water inlet valve 11-2 and an air inlet valve 11-3 for adjusting the water-air ratio and volume. The water inlet valve 11-2 is a DN20 shut-off valve, and the air inlet valve 11-3 is a DN20 ventilation butterfly valve. The water-air ratio is controlled by adjusting the air inlet butterfly valve and the water inlet shut-off valve of the three-way high-pressure spray gun 11, allowing for flexible adjustment to adapt to different geological conditions such as hard rock, soft rock, rocks that easily turn into mud when exposed to water, and even overburden layers. The outlet of the three-way high-pressure spray gun 11 is equipped with an air-water atomizing nozzle 11-5. The air-water atomizing nozzle 11-5 is a high-pressure stainless steel air-water atomizing nozzle with a nozzle diameter of 0.8mm and a pressure resistance of 2.0MPa, used to generate atomized high-pressure air-water flow 12. The three-way high-pressure spray gun 11 is formed by welding galvanized steel pipe 11-1 to form a three-way pipe structure, and a pressure gauge 11-4 is installed at the outlet of the three-way pipe.

[0036] The air supply hose 8, water supply hose 9, and corresponding branch pipes and the inlet of the high-pressure spray gun 11 are connected by quick connectors 11-6.

[0037] The cleaning device is assembled and configured as follows:

[0038] 1) Air supply system setup

[0039] Air compressor 1 is connected to air tank 3: 20m³ / s is selected. 3 Air compressor 1, with a capacity of 6m³ / min, supplies air through a high-pressure steel wire duct with a diameter of 80mm. 3The gas storage tank 3 is connected, and the rated pressure of the gas storage tank 3 is 1.2MPa. The tank body is equipped with a safety valve 3-1, which automatically releases pressure when overpressure occurs, meeting the pressure buffering requirements.

[0040] Installation of Gas Distributor 6: The distance between the gas storage tank 3 and the gas distributor 6 shall not be less than 10m. The outlet of the gas storage tank 3 shall be connected to the gas distributor 6. The gas distributor 6 shall be constructed of Q345R steel plate or steel pipe, with an epoxy resin anti-corrosion coating on the inner wall. The gas distributor 6 shall have 6 interfaces, each with a diameter of 20mm. The gas distributor 6 shall also have 6 branch pipes 6-1, each with a diameter of 20mm. Each branch pipe 6-1 shall be equipped with an independent valve to control the airflow. The gas distributor 6 shall be installed in a stable area 10m away from the dam foundation surface 10. The outlet of the branch pipe 6-1 shall be inclined downwards at 5° to drain condensate.

[0041] II) Water Supply System Configuration

[0042] Water distribution manifold 7 installation: A water supply branch pipe 5 with a water supply pressure >1.0MPa is led out from the construction water supply pipeline. The diameter of the water supply branch pipe 5 is 50mm. Water distribution manifold 7 is installed at the end of the water supply branch pipe 5. The number of water distribution manifold branch pipes is the same as the number of air distribution manifold branch pipes 6-1, which is 6. Water distribution manifold 7 has 6 interfaces, with an interface diameter of 20mm. Water distribution manifold 7 is equipped with 6 water distribution manifold branch pipes, with a diameter of 20mm. Each water distribution manifold branch pipe is equipped with a DN20 shut-off valve. Water distribution manifold 7 and air distribution manifold 6 are arranged in parallel with a spacing of 1.5m to facilitate operators to adjust the water-air ratio simultaneously.

[0043] (III) Assembly of the three-way high-pressure spray gun 11

[0044] Structural fabrication: A three-pronged high-pressure spray gun 11 is formed by welding galvanized steel pipe 11-1 with an outer diameter of 20mm and a wall thickness of 2mm according to the fabrication drawing. The angle of the three prongs is 36°. Fluid simulation optimization is performed to ensure uniform air-water mixing. The total length of the three-pronged high-pressure spray gun 11 is 2.0m. A DN20 shut-off valve is installed at the water inlet, a DN20 ventilation butterfly valve is installed at the air inlet, and an air-water atomizing nozzle 11-5 is installed at the outlet. A pressure gauge 11-4 with a range of 0-2.0MPa is installed at the outlet of the three prongs.

[0045] Connection between the three-way high-pressure spray gun 11 and the air and water supply system: The inlet of the three-way high-pressure spray gun 11 is connected to the air supply hose 8 and the water supply hose 9 through quick connectors 11-6. The air supply hose 8 is a 20mm diameter high-pressure steel wire hose with a pressure resistance of 1.5MPa, and the water supply hose 9 is a 20mm PVC steel wire hose with a pressure resistance of 1.2MPa.

[0046] Operating procedures and parameter adjustments for the cleaning device:

[0047] 1) Synchronous start of multiple spray guns

[0048] According to the construction intensity requirements, simultaneously activate 1-6 three-way high-pressure spray guns 11, start the air supply system and water supply system valves 4, and after the pressure of the air tank 3 stabilizes to 1.0MPa, gradually open the valves on the air distribution manifold branch pipe 6-1 and the water distribution manifold branch pipe. The pressure gauge 11-4 on the three-way high-pressure spray gun 11 shows 0.8-1.2MPa, which is the normal working range.

[0049] (ii) Geological Adaptability Adjustment:

[0050] Hard rock foundation surface: Increase air pressure to 1.2 MPa and adjust water flow to 0.8 m. 3 / h, the ventilation butterfly valve of the air inlet valve 11-3 is opened to 70%, and the shut-off valve of the water inlet valve 11-2 is opened to 60%, forming a high-speed atomized high-pressure air-water flow 12 that impacts the rock surface debris.

[0051] For soft rock or overburden: reduce wind pressure to 0.6-0.8 MPa and adjust water flow to 0.3 m. 3 / h, ventilation butterfly valve opening 40%, shut-off valve opening 30% to avoid water erosion causing damage to the base surface.

[0052] For layers that easily turn into mud when exposed to water: close the water inlet valve 11-2, and purge with high-pressure gas at a pressure of 0.5MPa, supplemented by manual cleaning of residual mud.

[0053] (III) Energy Conservation and Safety Control

[0054] Water resource recycling: Wastewater generated during cleaning is filtered through sedimentation tanks and then reused in non-critical processes, with a total water consumption of <1.0m³. 3 / h, traditional punching machine 3.6m 3 / h.

[0055] Pressure monitoring: Real-time monitoring is achieved through the safety valve 3-1 of the gas storage tank 3 and the pressure gauge 11-4 on the three-way high-pressure spray gun 11. The machine will automatically shut down when overpressure occurs.

[0056] Personnel protection: Operators must wear non-slip boots and goggles. Unauthorized personnel are prohibited from entering within a 5m radius of the working radius of the three-pronged high-pressure spray gun 11.

Claims

1. A dam foundation surface cleaning device, characterized in that: The cleaning device includes an air supply system, a water supply system, and a three-way high-pressure spray gun (11); the air supply system includes an air compressor (1), an air tank (3), an air distribution manifold (6), and an air supply hose (8). The air compressor (1) is connected to the air tank (3) through an air supply pipe (2). A safety valve (3-1) is installed on one side of the air tank (3). The air outlet of the air tank (3) is connected to the air distribution manifold (6) through the air supply pipe (2). The air distribution manifold (6) is equipped with multiple air distribution manifold branch pipes (6-1), and each air distribution manifold branch pipe (6-1) is equipped with an independent valve; the water supply system includes a construction water supply pipeline, a water supply branch pipe, and a water supply hose. Pipe (5), water distribution manifold (7) and water supply hose (9), water supply branch pipe (5) is set on the construction water supply pipeline, the end of water supply branch pipe (5) is connected to water distribution manifold (7), water distribution manifold (7) is set with multiple water distribution manifold branch pipes, and each water distribution manifold branch pipe is equipped with an independent valve; the three-way high-pressure spray gun (11) is connected to the air supply system and the water supply system. The three-way high-pressure spray gun (11) includes two inlets and one outlet. The two inlets are connected to the branch pipes of air distribution manifold (6) and water distribution manifold (7) through air supply hose (8) and water supply hose (9) respectively. The outlet is equipped with air and water atomizing nozzle (11-5).

2. The dam foundation surface cleaning device according to claim 1, characterized in that: One air compressor (1) is installed, with a discharge capacity of 20m³. 3 / min; The volume of the air storage tank (3) is selected according to the exhaust volume of the air compressor (1), and the capacity of the air storage tank (3) is 6m³. 3 The rated pressure of the air tank (3) is higher than or equal to the exhaust pressure of the air compressor (1), and the rated pressure of the air tank (3) is 1.2 MPa.

3. The dam foundation surface cleaning device according to claim 1, characterized in that: The distance between the gas storage tank (3) and the gas distribution bag (6) is ≥10m. The gas distribution bag (6) is installed in a stable area 10m away from the foundation surface (10) of the dam.

4. The dam foundation surface cleaning device according to claim 1, characterized in that: The gas distributor (6) is made of Q345R steel plate or steel pipe welded together, and the inner wall is coated with epoxy resin anti-corrosion layer. The gas distributor (6) has 6 interfaces with a diameter of 20mm. The gas distributor (6) is equipped with 6 gas distributor branch pipes (6-1), each with a diameter of 20mm. The outlet of the gas distributor branch pipe (6-1) is inclined downward at 5°. The valve installed on the gas distributor branch pipe (6-1) is a ball valve.

5. A dam foundation surface cleaning device according to claim 1, characterized in that: The water distribution manifold (7) and the air distribution manifold (6) are arranged in parallel with a spacing of 1.5m. The number of branch pipes of the water distribution manifold is the same as the number of branch pipes (6-1) of the air distribution manifold. The water distribution manifold (7) is provided with 6 interfaces with a diameter of 20mm. Six branch pipes of the water distribution manifold (7) are provided with a diameter of 20mm. The valves installed on the branch pipes of the water distribution manifold are DN20 stop valves.

6. The dam foundation surface cleaning device according to claim 1, characterized in that: The number of the three-pronged high-pressure spray guns (11) is configured according to the on-site construction intensity, with each gun having an exhaust volume of 20m³. 3 An air compressor (1) with a capacity of / min can simultaneously activate 6 three-way high-pressure spray guns (11).

7. A dam foundation surface cleaning device according to claim 1, characterized in that: The three-pronged high-pressure spray gun (11) has two inlets, including a water inlet pipe and an air inlet pipe. The water inlet pipe and the air inlet pipe are respectively equipped with a water inlet valve (11-2) and an air inlet valve (11-3). The water inlet valve (11-2) is a DN20 shut-off valve, and the air inlet valve (11-3) is a DN20 ventilation butterfly valve.

8. A dam foundation surface cleaning device according to claim 1, characterized in that: The three-pronged high-pressure spray gun (11) is formed by welding galvanized steel pipe (11-1) to form a three-pronged structure. The galvanized steel pipe (11-1) has an outer diameter of 20mm and a wall thickness of 2mm. The angle between the three prongs is 36°. The total length of the three-pronged high-pressure spray gun (11) is 2.0m. A pressure gauge (11-4) with a range of 0-2.0MPa is installed at the outlet of the three prongs of the three-pronged high-pressure spray gun (11).

9. A dam foundation surface cleaning device according to claim 1, characterized in that: The air-water atomizing nozzle (11-5) is a high-pressure stainless steel air-water atomizing nozzle with a nozzle diameter of 0.8mm and a pressure resistance of 2.0MPa.

10. A dam foundation surface cleaning device according to claim 1, characterized in that: The air supply pipe (2) is a high-pressure steel wire air supply pipe with a diameter of 80mm; the water supply branch pipe (5) has a water supply pressure of >1.0Mpa and a diameter of 50mm; the air supply hose (8) is a high-pressure steel wire pipe with a diameter of 20mm and a pressure resistance of 1.5MPa; the water supply hose (9) is a PVC steel wire hose with a diameter of 20mm and a pressure resistance of 1.2MPa; the air supply hose (8) and the water supply hose (9) are connected to the corresponding branch pipe and the inlet of the three-way high-pressure spray gun (11) through quick connectors (11-6).

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