Technical specification for safe operation of concrete pumping?

1. The concrete pump should be placed on a flat and solid ground with no obstacles around it. After lowering the legs and adjusting, the fuselage should be kept horizontal and stable, and the tires should be wedged tightly. 2. The laying of pumping pipes shall meet the following requirements: 1) Horizontal pumping pipes shall be laid in a straight line; 2) The vertical pumping pipeline should not be directly connected to the output port of the pump. The front end of the vertical pipeline shall be equipped with a horizontal pipeline with a length of not less than 20m, and a check valve shall be installed near the pump. 3) When laying downward inclined pipes, a section of horizontal pipes should be installed at the outlet, the length of which should not be less than 5 times of the elevation difference of inclined pipes. When the slope is large, the exhaust valve should be installed at the upper end of the slope; 4) The pumping pipeline should be supported and fixed, and a wooden cushion should be set between the pipeline and the fixture as a buffer, and it should not be directly connected with steel bars or templates, and the pipeline should be firmly connected; Pipe joints and clamps shall be tightly sealed and shall not leak slurry; Wear pipes shall not be installed in the high pressure area at the back end; 5) After the pumping pipeline is laid, pressure test shall be conducted. 3. Gravel particle size, cement grade and mixture ratio shall meet the pumpability requirements of the pump and conform to the provisions of the manufacturer. 4. Before operation, check that the bolts of the pump are fastened, the protective devices are complete and reliable, the operating switches, adjusting handles, handwheels, control rods and cocks of each part are in correct positions, the hydraulic system is normal without leakage, the hydraulic oil meets the requirements, there are no sundries in the mixing barrel, and the protective net above is intact and tightly covered. 5. The wall thickness of the conveying pipeline should match the pumping pressure, and high-quality pipes should be selected near the pump. Pipe joints, sealing rings and elbows shall be intact. Wet sacks or wet straw bags should be used to cover the pipeline under high temperature and scorching sun, and water should be used to cool down in time, and heat preservation measures should be taken in cold season. 6. Cleaning pipes, cleaning supplies, ball catchers and related devices shall be provided. Before starting the pump, irrelevant personnel should leave around the pipeline. 7. After start-up, run with no load, observe the indicated values of various instruments, check the operation of the pump and mixing device, and confirm that everything is normal before operation. Before pumping, add 10L clean water and 0.3m3 cement mortar to the hopper to lubricate the pump and pipeline. 8. During the pumping operation, the concrete plane in the hopper should be kept above the axis of the mixing shaft. The grating of the hopper shall not be filled with concrete, and the feed flow shall be controlled, and the aggregate and foreign matter exceeding the material diameter shall be removed in time, and the grating shall not be moved at will. 9. When the concrete entering the hopper has segregation phenomenon, it should stop pumping, and then pump after mixing evenly. When the aggregate separation is serious and the mortar in the hopper is obviously insufficient, some aggregates should be removed and mortar should be added to stir again. 10. Pumping concrete shall be operated continuously; In case of forced suspension due to feed interruption, the downtime shall not exceed 30 minutes. The reverse pump-positive pump moves for 2 ~ 3 strokes, and the pause time should be every 5 ~ 10 min (3 ~ 5 min in winter). The materials should be stirred well before feeding and pumping again. When the pump stop time exceeds the limit, the pipeline should be emptied. 1 1. When pumping again after the interruption of vertical upward pumping, the concrete in the distribution valve should be pushed in the opposite direction first, and then pumped forward after mixing. 12. When the pump rotates, it is forbidden to put your hand or shovel into the hopper or grasp the distribution valve by hand. When it is necessary to operate the hopper or distribution valve, turn off the motor and first eliminate the accumulator pressure. 13. Do not adjust the pressure of the hydraulic system at will. When the oil temperature exceeds 70℃, the pumping should be stopped, but the stirring blades and fans should still run, and then continue to run after cooling. 14. The water tank should be filled with clean water. When the water quality is turbid and there are many grains of sand, it should be checked and handled in time. 15. When pumping, the conveying pipeline and hydraulic pipeline shall not be opened; Do not adjust or repair moving parts. 16. During operation, attention should be paid to the observation of pumping equipment and pipelines, and hidden dangers should be handled in time. Replace excessively worn pipes, clamps and sealing rings in time. 17. Pipe blockage should be prevented. Pumped concrete should be mixed evenly to control slump; Don't stop the pump halfway during pumping. 18. When the conveying pipe is blocked, reverse pump operation should be carried out to return the concrete to the hopper; When the pump cannot be blocked for several times, the pipe should be removed to eliminate the blockage when the pump is empty. This paper introduces the contents of Technical Specification for Safe Operation of Concrete Pumping. Welcome to Zhong Da for more information.

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