CONCRETE PUMPING WITH SEPERATE PLACING BOOM
Pumping of concrete, conveying it with pipes and placing are carried out with three types of concrete equipment. These are stationary pumps, separate placing booms and high-pressure delivery line. The pumping process are not so easy and there are some difficulties at pumping in high and long horizontal distance. The reason would be using less powerful pump, insufficient delivery line and not benefiting from seperate placing booms.
Combination of stationary pump, delivery line and separate placing booms are inevitable in high and horizontal projects. The equipment required for a high-rise building is dependent on several factors:
-The height concrete needs to be pumped
-Whether the pump will be located indoors or outdoors.
-Whether multiple boom/pump/pipeline setups.
-How the boom will be mounted, self-supporting crane tower or self-climbing tubes, etc.
Calculating the pump pressure using nomogram:
-Concrete ‘Pressure Performance Nomogram’ was designed and developed by compiling values of several concrete pumping jobs taken from different site conditions.
-The deviation of the results on the basis of recorded values and the actual are only within the range of 5-10 %.
Nomogram consists of four quadrants showing the following values:
1.The relationship between output of concrete and pipeline diameters.
2.The resistance to flow of the entire pipeline system.
3.The workability of the concrete in terms of slump value in mm.
4.The maximum output, pressure, and power for a specific machine.
One way to place concrete quickly and economically is the use of separate placing boom in conjunction with efficient concrete pump.
The seperate placing booms are of equal design as the booms used on truck-mounted concrete pumps.
Advantages of using a seperate placing boom:
-Placing booms allow concrete to be poured into forms right where you need it!
-Placing booms lessen the need of manpower for spreading the concrete on the floor.
-Labour requirements are minimal, one person can operate the placing boom.
-Placing booms allow uniform concrete placement in wall, column and deck forms.
-Less finishing time is required because of the precise placement.
-Continuous flow results in higher quality concrete.
-Added time savings are realized by the tower crane being free to handle other lifting operations.
Related books of the autor:
-Highrise buildings – Concrete pumping (ENG)
-Concrete pump at operation (ENG)
-Betonu pompalamak (TR)
-Betonu pompalamak – Risk yönetimi (TR)
-Beton pompası performansı (TR)
-Beton pompası teknolojisi (TR)
-Pompa operatörü – El kitabı (TR)
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