In the majority of site building and construction, the pipelines are connected upward, such as hillsides, structures and more. The downward pipelines are reasonably much less. So, if the building and construction requires attaching pipeline downward, what should be focused on?
Due to the weight of the concrete in the pipe as a result of downward moving, to make sure that there might be openings or arteflow in the pumping pipes. Because of the quick dropping speed of rugged aggregate in concrete, as well as the slow mortar dropping speed, are inconsistent, which bring about the concrete partition and also the sharing pipe clog. It seriously affect the regular building, expand the expense of work and also product. It can not be pumped in serious cases.
In the concrete pumping downward with big fall, when the clog happens, the majority of the obstruction remains in the upright pipe, as well as the mixture gotten rid of from the pipeline is mostly crude accumulation. When the movement of some coarse aggregate is blocked, the activity rate of the back accumulation is impacted by it as well as is slow, resulting in the formation of coarse accumulation setting up. The mortar close-by is pressed away, the continuing to be gap is filled with tiny accumulation, the cement slurry lubrication layer is destroyed, the motion resistance is enhanced, the speed is slowed down, till the movement stops and also the pipeline is obstructed.
When the pipeline is arranged downward, when the disposition of the mixing towing pump ( or diesel pump and other line pump) pipeline is big, the concrete in the inclined pipeline might move downward because of its weight, to ensure that the hole in the sharing pipeline or the concrete segregation caused the sharing pipeline blockage, To avoid this sensation, the adhering to measures might be taken:
- When pumping concrete down, the spontaneous flow of concrete is closely pertaining to its collapse degree. Before pumping concrete, pump the water, inspect the pipe joints, guarantee that the seal is not absorptive, and after that pump the mortar lubrication pipeline to release the air in the pipe at the same time.
- When the inclination of the pipe is above 4 ° -7 °, established the horizontal pipeline equivalent to greater than 5 times the length of the upright decline (or the straight pipeline with 3 times the drop plus a hose at the front end of the down likely pipeline, as well as make use of the friction resistance to stop the spontaneous flow of the concrete.
- When the disposition of the pipe is above 7 ° -12 °, in addition to the horizontal pipe 5 times the size of the horizontal pipe (or 3 times the front end of the pipe), the exhaust shutoff ought to be mounted at the top end of the downward pipeline. In the pumping procedure, if there is an opening in the inclined pipe, the exhaust valve must be opened initially till the inclined pipe is full of concrete as well as the exhaust shutoff overruns the mortar, and afterwards the exhaust valve should be shut for regular pumping.
- The down pipeline with a large decline can be set up with a brake quit pipe in the center of the upright downward pipeline. Before pumping the mortar, insert several hard sponge spheres or cleaning plugs to avoid the loss of the mortar, which can hold up the weight of the mortar.
- When restricted by the site conditions, there is no enough horizontal pipe at the front of the downward inclined pipeline, the hose pipe, bending pipe or ring pipe can be utilized to boost the rubbing resistance and stop the arteflow of concrete in the descending likely pipe area.
It is worth to note that whether the pump pipeline connected up or down, different pipe straight conversion size, the real pipeline, because of the pipeline kind, amount, terrain, the real transmission distance and also elevation is not the same, for convenient calculation, the conelike pipeline, curved pipe, hose pipe, upright pipe, upright pipe down right into straight size. At the same time, the straight audit worth and also concrete attributes, pipeline size and so forth are likewise connected.