Pipe Block Foreign material plugging In theory

Pipe Block Foreign material plugging In theory, the most prone to plugging in three large stones in the same section meet clamping, the time most of the cross-section is occupied by stones, negotiable area is very small. Usually provide a maximum particle size and tube diameter stones d: D Poor concrete mix The ratio of bad concrete mixture in a large pressure gradient at the moisture will penetrate through the aggregate gap, so the aggregate coalescence caused by blocked tubes, occurs in pipe bends, reducers and piping at intermediate routing hoses; other easy segregation of concrete water-cement ratio is too large, resulting in separation of mortar and aggregate plugging, more common in long-distance pumping level when the "segregation" and the lower end of the vertical pipe blockage downstream piping segregation plugging. When the amount is too small cement and sand ratio is too low, poor workability of concrete, deformation difficulties in the pipe friction increases, easily plugging. Low slump concrete (80mm or less), the pumping resistance increased significantly, making pumping impossible. Sand particle size is unreasonable When 0.315mm sieve through the sand content is low, even if concrete Other technical indicators are in line with the requirements will be plugging. Because these sand play a role similar balls in concrete walls and concrete to reduce friction and improve liquidity in vain, increasing intake of cohesion and water retention, it can be a great influence on the concrete pump. Therefore, the provisions of 0.315mm sieve through sand should Motor concrete pumps not be less than 15% in JGJ / T10-95 "Technical Specification for Concrete Pumping" in. 7 Troubleshooting Easy to block the pump's location and troubleshooting Clogged dispensing valve at the discharge port A gate blocked, usually abruptly interrupted pumping system operation, and there is a strange noise, strong vibration equipment, but no corresponding vibration in the pipeline. Remedy: Pour water into the hopper mud, repeated forward and backward start the pump, forcing the passage is open. If this method is not dare, only artificial exclude, remove pipe connected, remove debris inside the valve. Clogged inlet at Inlet blockage, usually a pumping action and hydraulic systems are normal, no abnormal noise and vibration, the hopper has a large aggregates or agglomerates, stuck or arch in the feed throat. Remedy: reverse operation of the pump in order to destroy agglomerates, the concrete hopper back again stirring, then the forward pumping. If they do not, they need to manual cleaning, be excluded. Concrete pipes clogged When the delivery pressure is gradually increased, while the hopper material level does not drop, no material export pipeline, pump vibration occurs, the line is also accompanied by a strong vibration and displacement, it can determine a pipeline blockage. The judge blocked parts: clogging generally occurs in the elbow, taper pipe, as well as lots of vibration. At this point, the available hammers beating along the pipeline, sound boring place to blockages; crisp sound at normal. With ears, there is a rustle of normal, harsh sound of blockages. Valve at the blockage Valve at the blockage is evolving, mainly due After pumping concrete, did not wash with high pressure water, resulting in concrete left in the tube, thickening Over time, the accumulation of consolidation, causing blockage. Remedy: After pumping concrete, be sure to use a high pressure water pump and S tube rinse. When washing invalid, it can knock solder to remove the residue, until completely clean. Remedy: When plugging occurs, you should take repeated positive way to immediately reverse the pump, concrete pump outlet gradually sucked back into the hopper and then re-mix delivery. Also mallet percussion methods are available, combined with positive, reverse the pump, making it clear; when the above methods fail, indicating congested. Identifying the blocked section of the tube removed, with the high-pressure wind or a hammer or high-pressure water wash, to be completely clean up after, followed by a good pipeline continues to pump concrete work. 8 Precautions (1) When the installation and design of piping, try to avoid 90. And S-shaped bends. Try not to use a clear pit tubing to reduce drag pumping concrete to prevent clogging. You should always check the pump tube, if a direction of the pump tube wear large, timely use of the tube switching position, if the thickness of the thin tubing should be promptly replaced with new pipe to prevent the pump tube during operation off the hook or the replacement pump tube longer caused by the blockade. (2) In order to ensure the continuity of pumping concrete operations, to ensure the quality of concrete pouring, job interval time not too long, to prevent clogging. If for any reason a longer time interval, it should be about once every 20 minutes to start the pump or reverse, forward pump several times, if necessary, to fight the circulation pump to prevent clogging. (3) pumping a pumpable concrete should meet the requirements, if necessary, to determine the mixing ratio by pumping concrete pump test. You should first determine the coarse aggregate Rear Discharge Concrete Mixer than the maximum diameter of the particle size and delivery. Pumping height of 50m or less, not more than 1 for gravel: 3, for not more than pebbles 1: 2.5; when pumping height of 50 to 100m, preferably in 1: 3 to 1: 4 range; pumping height at 100m or more, preferably at between 1: 5: 4 to 1. Flakiness particle content of not more than 10%. 3.3.2 Different pumping height, people can pump concrete slump (Table 1) selection. 9 Use (1) towed concrete pump can use motor vehicle towed the line, but not carrying any cargo, towing speed should not exceed 8km / h; (2) The pressure relief valve concrete pump hydraulic system should meet the specification requirements, the user can not adjust to change; (3) pumps have a construction freeze in the cold season concrete measures; (4) in the hot season, construction, concrete pump to prevent high oil temperature. When the temperature reaches 70 ℃, it should stop the operation or take other measures to cool; (5) pumping concrete completed in a timely manner the hopper, S valve, concrete cylinder, transmission lines clean. After cleaning the pump should accumulator pressure release, cut off the power switch at each stop or off position; (6) Staff members shall climbing or riding on the pipeline, in the high-altitude operations should absolutely be avoided; Ago (7) pumping concrete finished cleaning, to the anti-pump several strokes to reduce the pressure within the duct to avoid an accident; (8) Construction site safety and accident prevention should be set up devices. Such as: instructions and warning signs, fences, metal baffles, etc., must be set in the work area (not less than 1 meter) around the pump, non-operators trespassing without permission. Regular replacement of the transfer line within three meters away from the operator, to be secured with wood or metal separator screen protection; (9) The non-vacuum gauge reading greater than 0.04Mpa job, it may damage the main pump; (10) the electrical control box use, installation, wiring shall professionals; (11) concrete pump hopper concrete must be higher than the agitator shaft, to avoid the intake air caused by concrete splash; (12) the end of the transfer pump pumping operations expenditure leg, received the first rear leg, to round down the branch, and then close the front legs; (13) The operator (of concrete pumps pump station) should be required to record concrete pumps work. (14) concrete pump before use to effectively fixed, support from four feet off the ground so that the tire, or remove tires. To check the top of the pump hopper and chute support, to ensure stable and reliable. Special attention overturn the pump caused casualties! (15) Note that when pumping concrete splatter or other items into the eye cause eye injury! (16) concrete pump power Coal mine with concrete pump supply wiring must have leakage protection switch, you should always check whether the electric elements working properly, the cable is damaged, to prevent electric shock casualties! (17) To ensure reliable connection pipelines, regular maintenance, to prevent pipe card, rushed to open clogged pipes burst or cause personal injury! (18) when the hydraulic system is not prohibited unloading opened hydraulic fittings or loosen hydraulic flange bolts, high-pressure hydraulic oil injection can cause a lot of damage! (19) when the pump working, non-hand into the hopper, tank, reversing cylinders and other moving parts of the region, need to check the operation should be shut down! 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