Hydraulic wet spraying machine construction process and matters needing attention

Hydraulic wet spray construction process is what? What are the precautions for hydraulic wet sprayer operation? The hydraulic wet sprayer mixes the cement, water and aggregate according to the design proportions uniformly, and uses a hydraulic wet sprayer to pressure-feed the sprinkler head. The quick-setting coagulant is added to the spray head and is then combined with the wind to spray. Henan Yuli sprayer manufacturers detailed analysis of hydraulic wet spray construction process and precautions.
First, the hydraulic wet spray construction process 1, the hydraulic wet spray machine should be opened before the high pressure air is turned on, the liquid idle for a few minutes, the machine and piping in the residual liquid and dirt blow out, and check the rotor silo is tight, Whether the pipeline is unblocked; when the main air valve is closed, the system can be turned on only when the system air pressure is above 0.5MPa.
2. Blow all the surface to be sprayed with compressed air or pressure water to blow loose impurities or dust on the surface to be sprayed; ensure that the wet spray speed is appropriate to facilitate the compaction of the crucible.
3, to maintain proper distance between the nozzle and the sprayed surface, the wet spray angle as close as possible to 90 degrees, in order to obtain the maximum pressure strength and the minimum rebound; correctly master the wet spray sequence, do not make the corners and the back of the bar appears Honeycomb or gizzard.
4. When starting or stopping the wet spray, signal to the wet spray driver. When the material flow cannot be evenly sprayed from the nozzle, the wet spray driver should also be notified to stop the work.
5, timely remove the gizzard by the spray surface or sagging squatting in order to re-wet spray; wet spray work, carefully clean the nozzle.
6. Preparation for spraying the surface When repairing the damaged structure, first remove the loose material, rinse thoroughly with pressure water, and blow away the accumulated water.
7. The operation of the wet sprayer can affect the rebound and compactness of the crucible and the uniformity of the flow. It is necessary to properly control the working air pressure of the wet sprayer and ensure the uniformity of the nozzle flow. The work wind pressure at the wet sprayer should be adjusted according to the appropriate wet spray speed. If the work wind pressure is too high, ie, the wet spray speed is too large, the kinetic energy is too large to increase the rebound, if the working wind pressure is too low, the pressure The strength is small, and the strength of the concrete is affected. The flow of the wet sprayer should be uniform to ensure that the quick-setting coagulant is evenly distributed in the crucible.
8. Operation of the nozzle: The distance between the nozzle and the sprayed surface: The optimal distance between the nozzle and the sprayed surface is generally 0.8 to 1 m. When the nozzle is too close to the spray surface, the compressed air will blow off the ramming mix that has just “sticked” on the sprayed surface, which will increase the rebound rate of the coarse aggregate; the wet spray angle: the spray head should be kept and sprayed. The surface is vertical. If the spray surface is covered by the grille or steel mesh, the spray head can be slightly deflected, but it should not be less than 70°. If the angle between the sprayer and the sprayed surface is too small, rolling of the crucible material on the working surface will occur, and a bumpy wave spray surface will appear, increasing the rebound rate and affecting the quality of the sneeze. In the section with the blind pipe, the blind pipe must be wet sprayed to form a water-permeable space behind the blind pipe. In wet spraying with rock mesh, the nozzle should be close to the sprayed surface and have a small angle with the vertical direction, so that the concrete behind the steel can be wetted and sprayed more securely. Good wrapping effect; in the case of wet spraying inside corners, the nozzles should be sprayed along the direction of the angle bisector at the angle between the two sprayed surfaces. After the corners have been filled with a curved surface, two more The side wall surface gradually extends, and then is sprayed at an angle of 90° to the wall surface. For the external corner, the nozzle can be vertically aligned with a sprayed surface and then sprayed on the other side of the corner box. The nozzle movement mode is that the time for the nozzle to point to a place should not be too long, because it will increase the rebound and it is difficult to obtain a uniform thickness. A good spraying method is to make the nozzle stably and systematically round or oval across the dome surface. Moving, the nozzle rhythmically makes a series of circular movements to form a uniform product and a minimum rebound. The wet ring drawn by the wet sprayer should be 40-60 cm laterally and 15-20 cm high. Wet spray should be divided into segments, subdivisions, and blocks (the length of subsection should not exceed 6m during wet spraying, and the subdivision should be first and then up and the subdivision size should be 2m×2). The nozzle should be continuously spirally circularly moved. The diameter of the spiral is about 20-30m, and after the first lap is one third of the pressure, the wet spray route should run from top to bottom and be in an "S" shape.
9. Thickness of wet spray: The spray thickness of the wet sprayed concrete layer on the wall can reach 10cm or more, and the thickness of the spray layer on the arch can reach 7cm. The main factors affecting the thickness of the sprayed layer are the slump of the concrete, the effect of the quick-setting agent, and the temperature. Generally about 8 cm of slump can get a thick spray layer, can guarantee the effect of concrete condensation in 2min is better, the working surface temperature needs to be above 15 °C.
10, stratified wet spray For fresh wet sprayed concrete, its tensile strength and adhesive strength are very low, once the wet sprayed concrete is significantly greater than the adhesive strength of the sprayed surface, it will appear sagging and falling off. Need to be layered wet spray, the interval between wet spray before and after the layer is 2 to 4 hours, a wet spray thickness does not slip with wet sneeze, not falling for the degree.
11. Surface leveling The natural leveling of the wet sprayed surface is desirable both in terms of structural strength and durability. Further additional repairs are often harmful and can damage wet sprayed concrete and steel reinforcement or between wet sprayed concrete and the bottom. Bonding between materials, and cracks in the concrete, however, the wet spray surface is naturally rough and flat, and requires a smooth surface and a beautiful appearance. A special leveling method must be used, that is, after the initial setting of the concrete (ie, 15-20 minutes after wet spraying) Use a spatula to scrape off excess material outside of the stencil or baseline, then level it with spray or screed. When spraying the last layer of enamel, the wet lances often achieve a uniform section with the help of wires and guides. Another method to control the uniform thickness is to spray some concrete strips and then spray them to the appropriate thickness. These strips must be hardened first and then filled with fresh enamel in the middle of the strips. The hardened strips are used as trowels. guide.
12. Maintenance of wet shotcrete (except for internal maintenance): After the final coagulation of the wet sprayed concrete for two hours, it shall be sprayed with water for curing, and the curing time shall be no less than 28 days and nights.
Second, the hydraulic wet spray Note 1, wet wet spray machine before the preparation process (1) connection duct, water, electricity, in the wet spray tank cooling tank fill the water, air wet spray machine, the equipment is normal, Inform the mixing station to mix and prepare the injection operation.
(2) Connect all the pipes of the wet sprayer, mix 10-20L cement slurry into the pipeline before spraying, put enough concrete material, and remove the stones on the screen in time.
(3) Startup procedure: Open the wind source - start the wet pump positive pump (start the switch to drive the motor to drive the oil pump) - Turn on the accelerator.
2. Pipe plugging treatment method (1) In the case of work, it is necessary to constantly observe the working pressure of the equipment. If the pressure of the pressure gauge reaches 130 bar, the pressure does not decrease because the pressure becomes abnormal and the accelerator should be closed in time. The sprayer transfer switch is turned up (reverse running), and the pump is turned off several times before shutting off the pump, and then the wind source is shut off. Check if the relevant parts of the reducer pipe are clogged up and found that they are blocked and clean immediately.
(2) After the pipeline is dredged, the pump operation mode is adjusted to normal operation, air blowing, start of power supply and accelerator switch.
3. Hydraulic Wet Sprayer Cleaning (1) After each sprayed concrete operation, it is necessary to clean all piping and pump hoppers and piston cylinders.
(2) Open the bottom door of the pump hopper, clean the concrete in the bucket, close the lower door, fill it with water, and insert the cleaning ball into the pipe until the cleaning ball and clean water flow out.
(3) Remove all pipes and flush them with water until they are clean. (4) Always process an end cap with the same size as the sprinkler. When the plug is in the front section, remove the connecting elbow and open the wind source. The concrete in the road is sprayed from the front end with pressure air, and the water is added to the pipe. It can also be pumped with a quick-setting agent pump, then added to the clean ball, opened, and repeatedly washed (this method must confirm that the surrounding workers are outside the safe distance).
(5) Open the lower discharge door, rinse with water, start the anti-pump switch, rinse the discharge port with water, and clean the pump S pendulum.
4. Maintenance and Maintenance of Hydraulic Wet Spraying Machine (1) Check whether the injector hole in the air ring sleeve is blocked before each startup, and clean the concrete residue of each small hole.
(2) The device has seven grease nipples, which need to be filled with butter before each operation.
(3) The tank of the pump cylinder must be filled with water before starting up.
(4) Observe the hydraulic oil level from time to time. Be sure to pay attention to the cooling of the hydraulic oil during operation.
Third, the spray gun operation operation need to pay attention to matters 1, the angle between the spray gun head and the rock interface to maintain vertical spray, so as to achieve the least rebound rate.
2. The distance between the spray gun mouth and the rock surface must be maintained at 1-1.5 meters, must not exceed 1.5 meters, and the best distance is 1 meter to ensure the least rebound rate.
3. The addition amount of alkali-free quick-setting agent should be controlled within the allowable range of 4-6%. Too much or too little will affect the rebound rate.
4. In order to achieve the minimum rebound rate, it is also necessary to perform dust blasting and water spraying on the rock surface to be sprayed prior to spraying so that the injected concrete and rock face can be effectively bonded.
5. For dry roadways, spray water should be properly sprayed on the concrete after spraying, and if the well is wet, the concrete can be naturally cured.
The above is related to the introduction of the construction process and precautions of the hydraulic wet sprayer. To learn more about the sprayer and wet sprayer, please visit the Henan Yuli website or contact us.

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