After the concrete mixer truck is discharged to the hopper of the pump truck, it is pressed to the conveying pipe by the pumping system and discharged through the end hose. Pen Fun Pavilion wWw. ｂiquge。 infoThe deployment and retraction of each section boom is completed by each boom cylinder. Wherein the elevation angle of the first section boom in the boom can swing in -2 ° ~ 90 °, the second section boom and the third section boom can swing 180 °, the four section boom is deployed in turn, the action of the fourth section boom is the most frequent, it can swing about 255 °, the hose at its end should be as close as possible to the pouring part when working, and the boom can be driven by the rotary motor and the reducer to rotate 365 ° around the fixed turret.

This car boom pump looks like an alien reptile in a science fiction movie at this time, but its ability is not small, and it is much faster than a tow pump in terms of pumping speed. Of course, its price is also several times more expensive than the tow pump, but because it is convenient and hit-and-go, it is particularly popular.

Of course, as we all know, it is not possible to produce a car boom pump in China, and this car boom pump is also bought back from Germany by the company at a large price, so its operators are extremely proud, which is worth millions of guys.

Xie Zili's confession continues: "Let's talk about the pipe blockage caused by unqualified pumped concrete, the concrete used for pumping must meet the requirements of pumping concrete, not all concrete can be pumped, and unqualified pumped concrete will aggravate the wear and tear of the pump, and often appear blocked pipes, bursts, etc." Specifically, the first is when the concrete slump is too large or too small. The size of concrete slump directly reflects the fluidity of concrete, and the conveying resistance of concrete decreases with the increase of slump. The slump of pumped concrete is generally in the range of 100 to 150, and for long-distance and large-height pumping, it is generally strictly controlled at about 160. If the slump is too small, it will increase the delivery pressure, exacerbate the wear of the equipment, and lead to pipe blockage. The slump is too large, and the concrete is easy to segregate under high pressure and cause pipe blockage. ”

"Another reason is the concrete mix. The sand rate is too small and the coarse aggregate gradation is unreasonable. Fine aggregates can be divided into river sand, artificial sand, sea sand and mountain sand according to the source, among which river sand has the best pumpability and machine-made sand has the worst pumpability. Fine aggregates can be divided into coarse sand, medium sand and fine sand according to particle size, among which medium sand has the best pumpability. Coarse aggregate can be divided into pebbles and gravel according to its shape, and the pumpability of pebbles is better than that of gravel. The maximum particle size of aggregate is also related to the minimum diameter of the conveying pipeline, the maximum particle size of pebbles should be less than 1/3 caliber, and the maximum particle size of gravel should be less than 1/4 caliber, otherwise it is easy to cause pipe blockage. Due to the different materials, there is an optimal value for the content of fine aggregate and the gradation of coarse aggregate. Under normal circumstances, the sand content should not be too low, should be greater than 40%, and the content of large particle size coarse aggregate should not be too high. Reasonable selection of sand content and determination of aggregate gradation are essential to improve the pumping performance of concrete and prevent pipe blockage. ”

"There is also too little or too much cement and cementitious material. Rubber material in pumping concrete, play the role of cementation and lubrication, while the cement has good water retention performance, so that the concrete is not easy to leak water in the pumping process, the amount of cement also has an optimal value, if the amount of cement is too small, will seriously affect the suction performance of concrete, while the pumping resistance increases, the water retention of concrete becomes poor, easy to leak, segregation and pipe blockage. In addition, the amount of cement is also related to the shape of the aggregate, the larger the surface area of the aggregate, the more cement slurry that needs to be wrapped, and the corresponding greater the cement content. Therefore, it is also important to reasonably determine the amount of cement to improve the pumpability of concrete and prevent pipe blockage. The last one is the unreasonable selection of admixtures, which makes the pumpability and fluidity of the concrete worse, which leads to pipe blockage. ”

Xie Zili said again: "Next, I will talk about the method of avoiding pipe blockage. The main factors affecting the pumpability of concrete are: the variety of cement and admixtures, admixtures, slump, aggregate gradation, shape and particle size, and mix ratio. When determining the mix ratio of pumped concrete, it is necessary to take into account the characteristics of pipeline pressure feeding, and deal with the amount of cement, slump, slump loss, setting time, sand rate, etc. At the same time, it is necessary to focus on the causes that are easy to induce pump pipe blockage, and focus on prevention to reduce the occurrence of pump pipe blockage. Of course, our technical quality department has done a good job, and there is a relatively good mix ratio, as long as the quality of concrete is strictly controlled in the production process. ”

"Below, I will talk about the precautions and some details in the concrete pumping process. After the concrete pump is started, an appropriate amount of water is pumped to wet the hopper, mesh and the wall of the conveying pipe of the concrete pump that are in direct contact with the concrete. The supply of concrete must ensure that the pump transporting concrete can work continuously. During the pumping process, there is enough concrete in the receiving hopper to prevent blockages caused by the intake air. The conveying pipeline should be straight, slow to turn, and the joints should be tight to prevent slurry leakage at the joints of the pump pipes. This is something that must be paid attention to, and we will have to evaluate this aspect in the future. Before pumping concrete, pump cement mortar with the same mix ratio of other components in the concrete except coarse aggregate. When the pumping starts, the concrete pump is in a state of slow speed, constant speed and can be reversed at any time. The pumping speed, first slow and then fast, gradually accelerates. At the same time, observe the pressure of the concrete pump and the working condition of each system, and pump at a normal speed only after the smooth operation of each system. When pumping concrete, the piston runs at maximum stroke. Reasonably arrange the construction time of each stage and wash the pump in time. ”

"If the concrete slump is low and not satisfied, it can be adjusted on the spot. Appropriately adjust the slump of concrete, and appropriately add additives such as pumping agents to improve the workability and fluidity of concrete. If it is necessary to suspend the construction, a retarder can be added. Before arranging pumping, the production department should go to the site to observe the topography, horizontal distance and vertical height and other pumping conditions, and select the appropriate concrete pump, so as to avoid the selection of concrete pumps whose pumping pressure does not meet the requirements, resulting in the blocking of pumps and pipes in the pumping process, and the size of the conveying pipe should be selected according to the requirements of coarse aggregates, so as to avoid improper selection and pipe blockage. It is also necessary to arrange the position of each pump tubing to minimize the number of elbows. ”

"Another is that when the ambient temperature is too high, the concrete is very easy to evaporate water, it is easy to cause pipe blockage, the conveying pipe is covered after absorbing water such as straw bags and cloth bags, and the water is watered in time to cool down, and the continuity of pumping is maintained; When washing the pipe after pouring, you can't directly draw water, you must use a special ball, otherwise the pump pipe is full of sand and stones, and the next pouring is easy to block the pipe. ”

"If the pipe is blocked due to an accident, we must also deal with it in time and eliminate it quickly. When the conveying pipe is blocked, the following methods are adopted to exclude, one is to repeat the reverse pump and positive pump, gradually collect the concrete into the hopper, and pump it after re-mixing. The second is to use wooden sticks and other methods to find out the blockage position, and after the concrete is powdered, repeat the reverse pump and positive pump to eliminate the blockage. Third, when the two methods of appeal are ineffective, after the concrete is depressurized, the conveyor pipe at the blockage is removed and the concrete blockage can be taken over after the concrete is discharged. Before repumping, remove the air from the pipe before tightening the fitting. ”

The applause rang out warmly, because Xie Zili spoke very well and had strong application! )

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