Selecting right equipment and pumpable concrete and safety issues…
-With modern concrete pumps, building heights have reached hundreds of meters. The record for today is about 600 meter and an engine of approx. 500 kw was used in the pump. However, the powerful concrete pump alone is not enough for such performance. Increasing the speed and volume of conveying concrete and the total performance are not only depending on pump. But the other factors such as suitable pipeline system, using right placing boom, concrete receipe, safety precautions and trained as well as experienced people are also important.
-All construction projects are the areas of potential danger! However with the selection of right equipment and personnel training these hazards can be eliminated. Unsafe working causes many injuries and breakdowns and interruptions in work. Safety is the most important factor that you can complete the job in the shortest time and at the least cost. Placing line, straight sections, bends and elbows should be chosen by knowledgeable and experienced people who know in certain areas the line must not be rigid but flexible. The use of placing booms and other special equipment has made the training more important for safety.
-Increasing the cross section of the line has a direct influence on the flow rate, the wear behaviour, the pressure requirement and the period for which the concrete remains in the pipeline given the same output per hour. On the other hand under high pressure concrete pump, delivery line and special equipment are always dangerous during pouring. All components of the system must be able to handle the maximum internal pressure. In addition, cleaning operations at the end of pouring can only be done by trained personnel. Do not think that it is simple job and can be done by ordinary workers. Injuries are mostly experienced during the cleaning phase.
-The rate of wear varies greatly. Hard aggregate is of course more abrasive than a softer aggregate . In addition to physical characteristics of the concrete, wear is also affected by the concrete volume conveyed, material velocity, pumping pressure and geometry of the system. You need also an accurate concrete recipe, because you can’t just rely on chemicals. The nature of the materials both facilitates the flow of concrete and provides a permanent advantage in concrete. For highrise building projects, sometimes the pipeline cost may take priority over the pump. And many problems can arise if the pump cannot produce enough pressure. For example, the material may get stuck in the line, causing the pipe to burst and the connections to break.
-This book is prepared to provide basic information for selecting right equipment and preparing pumpable concrete and safety issues. Therefore all staff not only operative personel like pump operators, their assistants and other workers in the field, but also for the people who make preliminary work of any highrise building project can also benefit.
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