Xie Zili said: "As you all know, concrete pumping is the most important concrete transportation method for our commercial concrete, which has the characteristics of convenient construction and fast conveying speed, but pumping has higher requirements for operators and concrete quality. Pen & Fun & Pavilion www.biquge.info we have been trained, today I will mainly talk about some of the reasons for the blockage of the pipe in the process of concrete pumping, I hope you pay attention, do not block the pipe because of these problems, once the blockage occurs, we also have to quickly eliminate, if the blockage is not solved for a long time, it will not only affect the continuity of concrete supply, but also affect the quality of the project, and can even lead to serious quality accidents, for our new concrete batching plant, we must not have this kind of problem, otherwise we will even survive will become a problem. ”

"Specifically, there are several main reasons for pipe blockage, one is improper operation, the second is the layout of the pipeline, and the third is the quality of concrete. The first reason is improper operation. For example, the operator is not concentrating. The pump operator should concentrate on the pumping construction, always pay attention to the reading of the pumping pressure gauge, once it is found that the pressure gauge reading suddenly increases, it should immediately reverse the pump 2-3 strokes, and then pump and block the pipe to be eliminated. If the pipe blockage has not been eliminated after several operation cycles of reverse pump and positive pump, the pipe should be removed and cleaned in time, otherwise the pipe blockage will be more serious. ”

"Another example is the poor choice of pumping speed. When pumping, the choice of speed is very critical, the operator can not blindly figure fast, the speed is not reached, the first pumping, due to the large resistance of the pipeline, at this time should be pumped at low speed, after the pumping is normal, the pumping speed can be appropriately increased. When there are signs of pipe blockage or the slump of a certain car of concrete is small, it should be pumped at a low speed to eliminate the pipe blockage in the bud. ”

"The amount of residual material is not properly controlled. When pumping, the operator must observe the remaining material in the bucket at any time, and the remaining material shall not be lower than the mixing shaft, if the remaining material is too small, it is easy to inhale air, resulting in pipe blockage. The material in the hopper should not be piled too much, and should be lower than the protective fence to facilitate the timely cleaning of coarse aggregates and oversized aggregates. When the slump of a certain car of concrete is small, the remaining material can be lower than the mixing shaft and controlled above the S pipe or suction inlet, so as to reduce the stirring resistance, swing resistance and suction resistance. This method is only applicable to S valve series concrete pumps. Improper measures are taken when the concrete slumps too small. When it is found that the slump of a bucket of concrete is very small and cannot be pumped, the concrete should be discharged from the bottom of the bucket material in time. ”

Xie Zili saw that everyone was listening very carefully, and continued: "The second big reason is the pipeline. The reason for the pipeline mainly refers to the pumping method of the trailer pump, and of course, the boom pump also has the pipe blockage caused by the unclean cleaning of the pipeline. Now I will mainly talk about pipeline laying. Pipe connection errors can easily lead to pipe blockage. The following principles should be followed when taking over. When the pipeline is arranged, the pipe should be routed according to the shortest distance, the least elbow and the largest elbow to minimize the transportation resistance, which also reduces the possibility of pipe blockage. At the cone pipe at the outlet of the pump, it is not allowed to directly connect the elbow, at least a straight pipe should be connected, and then the elbow should be connected. When taking over in the middle of pumping, only one can be added at a time, and the inner wall of the pipe should be lubricated with water and the air should be exhausted, otherwise it is easy to cause pipe blockage. For vertically downward pipelines, anti-segregation devices should be installed at the outlet to prevent pipe blockage. When pumping at a high level, the length of the horizontal pipeline should generally not be less than 15% of the length of the vertical pipeline, and the pipeline shut-off valve should be connected to the horizontal pipeline. When the downtime is more than 5 minutes, the shut-off valve should be closed to prevent the concrete from backflowing and causing pipe blockage. When turning from horizontal to vertical, the bending radius of the 90-degree bend should be greater than 500 mm. ”

"Let's talk about the segregation of concrete or mortar that leads to pipe blockage. When concrete or mortar encounters water, it is easy to cause segregation. Sometimes when pumping mortar, the pipe blockage phenomenon occurs, which is caused by the segregation of the mortar after the mortar is in direct contact with the water in the pipeline. The precautionary method is to wet the pipe with water before pumping, loosen the pipe joint from the lowest point of the pipe, and drain all the remaining water, or put in a sponge ball to separate the mortar from the water before pumping the mortar after pumping. When cleaning the pipeline after pumping, a sponge ball should also be put in to separate the water from the concrete, otherwise it is easy to cause pipe blockage. ”

"There is also a blockage caused by local slurry leakage. Due to the leakage of mortar, on the one hand, it will affect the quality of concrete, and on the other hand, after slurry leakage, it will lead to the reduction of the slump of the concrete and the loss of pumping pressure, which will lead to pipe blockage. There are several main causes of slurry leakage. The sealing of the transmission pipeline joint is not tight. The joint of the conveying pipeline is not tightly sealed, the pipe clamp is loose or the sealing ring is damaged and the slurry leaks. At this point, the pipe clamp should be tightened or the sealing ring should be replaced. The gap between the spectacle plate and the cutting ring is too large. When the spectacle plate and cutting ring are severely worn, the gap between them becomes larger. When the gap is greater than 10%, the gap between the spectacle plate and the cutting ring must be reduced by adjusting the special-shaped bolts, and if it is no longer possible to adjust, the wear parts should be replaced immediately. The piston of the concrete pump is seriously worn. The operator should always observe whether the water in the tank is turbid, whether there is mortar, once it is found that the water has been turbid or there is mortar in the water, indicating that the concrete piston has been worn, the piston should be replaced in time, otherwise it will lead to pipe blockage due to slurry leakage and pressure loss, and it will also aggravate the wear of the piston and the conveying cylinder. Slurry leakage caused by severe wear and tear of concrete conveying cylinders. If the water in the tank quickly becomes turbid after each piston is replaced, and the piston is good, it means that the conveying cylinder has been worn, and the conveying cylinder needs to be replaced. ”

Li Liangfeng also listened to it with relish, he didn't know that there were so many exquisiteness in pumping, it seemed that he had to study it carefully, and he wouldn't have to go to a management position in the future, these knowledge were very important.

Qin Haijuan didn't know these before, after all, she just stayed in the laboratory to do experiments, and she didn't know much about things on the construction site, but now it is an excellent opportunity to continue to learn and grow.

Of course, the pump operators and takeovers listened more carefully, because it was their job, and most of them had no practical experience, and although they were trained, these details had not yet been covered.

Of course, they know a little bit about the principle of the pump machine, for example, the concrete pump truck is a kind of equipment that integrates the pumping system for pumping concrete and the boom system for distributing materials on the chassis of the car, and the pumping system uses the power of the chassis engine to pressurize the concrete in the hopper and send it into the pipeline, and the pipeline is attached to the boom, and the operator controls the boom to move, and the concrete pumped out of the pumping system is directly sent to the pouring point.

The pumping system is the actuator of the concrete pump truck, which is used to continuously convey the concrete along the conveying pipeline to the pouring site. The pumping system is composed of a pumping mechanism, a hopper and an S valve assembly, a swing mechanism, a stirring mechanism, a piping assembly, and boom piping.

The difference between the tow pump and the car boom pump is that the car boom pump integrates the pipeline into the car and can freely pump concrete to the location within the radiation radius, which is the same in terms of pumping principle. (To be continued.) )