How does pumped concrete work?
Concrete that has been pumped up to a height is concrete that has been pumped up using concrete pumps. When working with a lot of concrete at a higher altitude and other transport methods are difficult to employ, this method is used. Over 50 years have passed since the invention of concrete pumps. In the current day, substantial amounts of concrete may be moved over long distances by pumping through pipes, frequently to places that may be difficult to reach by other delivery methods. Check out the best Info pumping here.
The basic components of the concrete pumping system are the mixer, a hopper into which the concrete is discharged, the concrete pump itself, and lastly the delivery pipelines via which the concrete is transported.
Various Concrete Pump Types
- In general, there are two categories of concrete pumps used for transportation:
- Concrete pumps with a direct action
- pumps for concrete that squeeze
1. Concrete pumps with a direct action
Most concrete pumps have semi-rotary valves and are direct-acting, horizontal piston types (fig.1). The direct acting pump has a straightforward design. The semi-rotary valves alternately open and close as the concrete is fed into the pump by gravity and partially by the suction produced by the horizontally acting piston’s reciprocating motion. In the pumping cylinder, under ideal circumstances, suction pressure on the order of 0.08 N/mm2 is created.
The diameter of the suction pipe should match that of the pumping cylinder for the best suction conditions and for unimpeded concrete flow. The suction pipe’s entire cross section should be able to accommodate the free flow of concrete, and any obstructions brought on by too large particles should be avoided. The suction pipe’s diameter should ideally be at least three times larger than the largest aggregate in the concrete that can be pumped. The largest size of aggregate that can be utilised in a particular concrete mix that is to be pumped is thus determined by the diameter of the suction pipe.
The intake valve opens during the “suction stroke” and allows concrete to enter the pumping cylinder while keeping the output valve closed. The concrete is forced into the delivery pipeline during the “delivery stroke,” which involves opening the exit valve and closing the intake valve. The delivery pipe is always full, causing the concrete to travel in a succession of impulses. Modern pumps are capable of producing outputs of up to 60 m3/h through delivery pipes with a diameter of 230 mm.
2.pumps for concrete that squeez
Smaller, transportable peristaltic pumps are squeeze type pumps. Rotating blades in the pumping chamber, which is under a vacuum of roughly 0.08 N/mm2, feed the concrete from the collecting hopper into a flexible pipe linked to the chamber.
The vacuum makes sure the pipe shape stays cylindrical, save for when it is compressed by the revolving rollers, which enables a constant flow of concrete. The flexible pipe is gradually compressed by the two revolving rollers mounted on planetary motors, which forces the concrete into the delivery pipe. Utilizing tubes with a 75 mm diameter, squeeze pumps can provide outputs of up to 20 m3/h.
The two main criteria used to choose concrete pumps are the maximum intended volumetric production of concrete per hour and the peak pumping pressure, p. The majority of civil engineering applications that include ordinary concreting operations are thought to be compatible with a nominal production of 30 m3/h. Pumps with capacities beyond 120m3/h have been found to be used for specialised tasks when higher output is necessary.
The concrete pump’s drive unit’s (prime mover) power requirements are influenced by the target concrete delivery output (Q) and the pumping pressure (p). The concrete pump’s hydraulic output, H, is expressed as a relationship between the delivery output and pumping pressure:
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