Concrete wet spraying machine construction preparation check is affected by the contour size of the spraying surface, and it is corrected so that it meets the design requirements. The loose and broken parts must be cleaned; the well-adsorbed water section must be prepared in advance to prevent water discharge; use high-pressure gas or water (geological defects do not use) to clean the sprayed surface; ready scaffolding or work platform; check the machinery, pipelines, safety valves, pressure gauges are intact, and test run; in the vault, the side wall to do a good design spray thickness mark.
The spray construction process of the concrete wet spraying machine strictly follows the following sequence: open the auxiliary gas source of the accelerating agent → slowly open the main gas valve → start the quick-setting coagulant metering pump, the main motor vibrator → feed the hopper.
Observe the pressure after starting the machine. The starting pressure should be greater than or equal to 0.5 MPa before starting the machine. At the same time, adjust the air pressure according to the discharge conditions of the nozzle. The working pressure of the side wall should be controlled at 0.3 to 0.5 MPa and the arch at 0.40 to 0.65 MPa.
The feed shall be continuous and uniform, and there shall be sufficient stock in the hopper and promptly remove coarse aggregates with a particle size greater than 15 mm on the vibrating screen.
The nozzle and the sprayed surface should be as vertical as possible, and maintain a distance of 0.8 to 1.0 m; for the sprayed surface on which the steel mesh is hung, the nozzle should be slightly tilted and the distance should be relatively reduced; when the distance between the spray nozzle and the sprayed surface is greater than 1.0 m, will increase the rebound, and reduce the degree of compaction, thus reducing the strength; when the nozzle distance is less than 0.8 m from the spray surface, not only the rebound will increase, and the injection operator may be subject to rebound particles hurt.
Shotcrete should be segmented, divided, divided into blocks, and then be sprayed on the front wall, back arch and bottom-up. The nozzle needs to make even clockwise spiral rotation of the sprayed rock face, and the horizontal movement of a half circle is pressed in one circle. The spiral diameter is about 20 to 30 cm, or it moves forward with an S-shape reciprocation. The length of the segment during injection shall not exceed 6 m, and the subdivision shall be first and then up, and the block size shall be 2 m × 2 m. The initial spray thickness is generally controlled at 4 to 5 cm, and the second spray thickness is 10 cm or more.
The construction precautions of the concrete wet spraying machine strictly control the nozzle pressure so that it is in the range of 0.15 to 0.20 MPa. The distance and angle between the spray nozzle and the sprayed surface shall be strictly controlled. When no steel mesh is sprayed, the spray nozzle shall be perpendicular to the spray surface. When there is a steel mesh, the bias may be appropriately adopted. The distance from the spray surface to the spray surface is controlled within the range of 0.8 to 1.0 m. Strictly control the water-cement ratio, it is appropriate to have a layer of pale luster on the surface of the newly injected concrete. For the leaked water segment, it must be purged with compressed air before spraying the concrete. When the amount of water is not large, spraying concrete ingredients and spices in accordance with the normal construction procedures; when the amount of water is large, the amount of water should be properly reduced when the injection is started, from the far and near when spraying, temporarily increase the amount of accelerator ( Not more than 5%) gradually close, after water stops, must be closed with shotcrete with normal accelerator; sprayed concrete must be tested for moisture content of sand to correct the amount of water added to achieve the desired fall. Degree; the temperature of the aggregate and the cement should not be lower than 5oC.
The spray construction process of the concrete wet spraying machine strictly follows the following sequence: open the auxiliary gas source of the accelerating agent → slowly open the main gas valve → start the quick-setting coagulant metering pump, the main motor vibrator → feed the hopper.
Observe the pressure after starting the machine. The starting pressure should be greater than or equal to 0.5 MPa before starting the machine. At the same time, adjust the air pressure according to the discharge conditions of the nozzle. The working pressure of the side wall should be controlled at 0.3 to 0.5 MPa and the arch at 0.40 to 0.65 MPa.
The feed shall be continuous and uniform, and there shall be sufficient stock in the hopper and promptly remove coarse aggregates with a particle size greater than 15 mm on the vibrating screen.
The nozzle and the sprayed surface should be as vertical as possible, and maintain a distance of 0.8 to 1.0 m; for the sprayed surface on which the steel mesh is hung, the nozzle should be slightly tilted and the distance should be relatively reduced; when the distance between the spray nozzle and the sprayed surface is greater than 1.0 m, will increase the rebound, and reduce the degree of compaction, thus reducing the strength; when the nozzle distance is less than 0.8 m from the spray surface, not only the rebound will increase, and the injection operator may be subject to rebound particles hurt.
Shotcrete should be segmented, divided, divided into blocks, and then be sprayed on the front wall, back arch and bottom-up. The nozzle needs to make even clockwise spiral rotation of the sprayed rock face, and the horizontal movement of a half circle is pressed in one circle. The spiral diameter is about 20 to 30 cm, or it moves forward with an S-shape reciprocation. The length of the segment during injection shall not exceed 6 m, and the subdivision shall be first and then up, and the block size shall be 2 m × 2 m. The initial spray thickness is generally controlled at 4 to 5 cm, and the second spray thickness is 10 cm or more.
The construction precautions of the concrete wet spraying machine strictly control the nozzle pressure so that it is in the range of 0.15 to 0.20 MPa. The distance and angle between the spray nozzle and the sprayed surface shall be strictly controlled. When no steel mesh is sprayed, the spray nozzle shall be perpendicular to the spray surface. When there is a steel mesh, the bias may be appropriately adopted. The distance from the spray surface to the spray surface is controlled within the range of 0.8 to 1.0 m. Strictly control the water-cement ratio, it is appropriate to have a layer of pale luster on the surface of the newly injected concrete. For the leaked water segment, it must be purged with compressed air before spraying the concrete. When the amount of water is not large, spraying concrete ingredients and spices in accordance with the normal construction procedures; when the amount of water is large, the amount of water should be properly reduced when the injection is started, from the far and near when spraying, temporarily increase the amount of accelerator ( Not more than 5%) gradually close, after water stops, must be closed with shotcrete with normal accelerator; sprayed concrete must be tested for moisture content of sand to correct the amount of water added to achieve the desired fall. Degree; the temperature of the aggregate and the cement should not be lower than 5oC.
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