What is a concrete sprayer? How to use concrete jets?

What is a concrete sprayer? How to use concrete jets? Concrete sprayers, also known as concrete shotcreting machines, mainly use compressed air to transport concrete through the material cavity into a continuous spraying device along the conveying pipe and spraying it onto the construction surface. Concrete jets are mainly divided into dry concrete jets (right picture) and wet concrete jets. The former are mixed by pneumatic conveying and dry mixing. The nozzles are mixed with pressure water and then jetted out. The latter consists of pneumatic or concrete pumps. The concrete mixture is conveyed through the nozzle. Concrete jets are widely used in underground concrete projects, hydropower projects, wells, tunnels, culverts and other shotcrete construction operations. The Henan Yuli spraying machine manufacturer analyzes how to use the concrete spraying machine and hopes to help everyone.
First, preparation of injection materials 1, cement: the use of trademarks, labels meet the design and specification requirements.
2. The sand is medium sand or fine sand. It must be sifted before use. The mud content should not exceed 3%.
3, gravel using gravel, should be screened before use, remove impurities, particle size in accordance with regulations.
4. The mix ratio of the dry mix meets the operational regulations.
5. Accelerating agent, before use, according to the performance of cement, according to the requirements of quick-acting agent factory specification cement paste coagulation test to determine the best dosage, generally 2.5-4% of the weight of cement, requirements in 3-5 The primary coagulation is divided into minutes and the final coagulation is completed within 10 minutes. The dosage of the quick-setting coagulant in the construction shall comply with the provisions of the operating procedures. Accelerating agents should be unpacked in place when in use. Damp and degenerate caking cannot be used.
6, mixing dry mix, the material must be over the bucket, strictly control the mix ratio, dry mix should be evenly stirred, artificial mixing, stirring at least three times on the steel plate.
7, dry spices should be used with the mix to avoid moisture failure, dry spices can not be stored for more than half an hour.
Second, the preparation before the injection 1, the work site inspection preparation. Check whether the quality and quality of the roadway excavation are qualified, and the unqualified segment should be processed first. Click on Bang to ask the top, rule out the top state pumice, clean up the state of the two states, and to reach the base of the two states. Obstacles affecting jet operations must be dismantled, and they must not be removed. For example, cable lines, air ducts, etc. need to be protected and covered. When the sprayer cannot be directly contacted with the sprayer, a dedicated contact signal must be set. Spread the iron plate in the spraying area and prepare for the recycling of the rebound.
2, check the concrete jet. Inspect the hopper for debris remaining in the hopper. Relax the pressing mechanism on the rubber plate, and remove the check rubber plate and rotating plate steering direction with the arc plate and the top screw. If the rotation is counterclockwise, the steering direction is correct. The jog motor checks the steering of the steel lining and rotates counterclockwise to indicate correct steering. Tighten the compression mechanism on the top of the rubber plate and the top screw on the outside of the arc plate to adjust the gap between the rubber plate and the steel backing plate so that the combination is tight and stable. Oil-water separator drains oil. Open the cut-off valve to check the air leakage condition around the rubber plate, and adjust the air pressure according to the length of the feed pipe, and blow the pipe for 2-3 minutes. No-load test run motor is normal.
3, check the spray gun. The jet operator is responsible for unloading the parts of the spray gun and checking the wear of the incoming pipe, water ring and its connecting parts, and whether the water hole is clogged or not, and the other parts that have been damaged are immediately modified and replaced.
4, check the delivery pipeline. Air supply, water supply test, wind detection, whether the water pipe leaks or runs, whether there is leakage of material in the feeding pipe, knocking on the feeding pipe to check the wear, and whether the discharge elbow is blocked.
5. Check whether the pressure gauge is flexible.
3. Shotcrete Operation Procedure 1. Prior to the start of shotcrete operation, old belts should be laid on the spray site to collect the rebound material. The rebound rate should not exceed 10%. Open water, open air, adjust the amount of water, keep the wind pressure not less than 0.4MPa, water pressure should be about 0.1MPa higher than the wind pressure, add water volume with the shooter's experience to control, water-cement ratio 0.4.
2. The sprayer operates the sprayer and flushes the rock face from top to bottom.
3, concrete jet power transmission, spray gunning.
4. Adjust the amount of feng shui again according to the feeding conditions to ensure that there is no dry spot on the spray surface, no runny, strong adhesion and less rebound material.
5. The sprayer sprays in sections in the order from the bottom to the top and back of the wall.
6. When sprayed, the sprayer should be sprayed vertically as far as possible. The included angle should not be less than 70 degrees.
7. When spraying, the trajectory of the nozzle should be in a spiral shape, according to the diameter of 200-300mm, a circle presses the semi-circular method to move evenly and slowly.
8. The thickness of the concrete shotcrete shall be 50-70mm at one shot, and shall be repeated in time. The interval between the double sprays shall not exceed 2 hours. Otherwise, use high pressure water to re-flush the sprayed surface.
9, should be equipped with two people, one person holding the nozzle jet, one auxiliary lighting and responsible for contact, observe the top of the security and jet quality.
Fourth, the concrete jet machine shutdown operation 1, after the end of the shotcrete operation, according to the first stop material, after the stoppage of water and then the final off the wind power sequence.
2. After the spraying work is completed, remove the spray head, clean the water ring and the mortar or the material inside and outside the sprayer, and wind up the wind water pipe.
3. Clean up and collect rebound materials, and use clean materials in shifts.
4. Spraying concrete began to spray for 2 hours after curing, and core strength was measured after 28 days.
V. Notes for concrete jets 1. When jetting by fractional shots, double shots should be performed after the last shot, and if final shots are made after one hour, they should be cleaned with water. If there is an overcut or crack in the depression, it should be sprayed and then sprayed normally.
2. It is forbidden to aim the sprayer at the person.
3. During the injection process, if there is a failure such as blocking or stopping the wind and power failure, the water gate should be closed immediately, the showerhead should be placed down to prevent water from flowing into the feed pipe, and the tapping method should be used to dispose the feed pipe when handling the blocked pipe.
4, spray personnel to wear dust masks, latex gloves and glasses.
5. After the shotcrete work is completed, the spray layer will be sprayed once every 7 days, and once every 7 days, it will be sprinkled once a day for 28 days.
6. The concrete jet operator must be specially trained to be familiar with the jet's performance structure and working principle, and to be able to eliminate general malfunctions and carry out routine maintenance and maintenance.
7. The air inlet is well-sealed to prevent the air from blowing dust; the air outlet is unimpeded and the exhaust gas is discharged smoothly; the spray pipe joint is firm, well-sealed and neatly arranged.

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