1ã€The hydraulic high-pressure wet air blower shall be opened before the start of the hydraulic wet spray machine. The liquid idles for a few minutes, blows out the residual liquid and dirt in the machine and the pipeline, and checks whether the rotor silo is tight and 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.
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.
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