Pumping concrete can be very economical when the concrete quantity required is over 1150 m3 or when a supply of uninterrupted concrete is required for a few days or weeks. In the majority of cases, concrete that is pumped along either a level or straight pipe line can reach distances of between 300 to 450 m or up to a vertical height of 40 m with the use of a single pump. A rise of 30 cms is equal to 2.4 m on level ground, while right-angled bends is equal to around 12 m.
This would mean that for bends of 90° the horizontal distance reaching 12 m and for a 22 ½° bend the 3 m horizontal distance will need to be reduced. For concrete pumping sharp bends cannot be attached to the pipe line. In between each bend a straight pipe would need to be attached.
What Is A Pipe Line For Concrete Pumping?
The pipe lines that are used for concrete are typically made from mild-steel tubes that come in 3 m sections along with specialized joints for quick release and assembly. There are also short lengths and bends available. The pipe sizes vary from 11.25 cms to 20 cms (inside diameter). These pipes of mobile concrete mixer with pump for sale require a diameter that must be 3 times the “maximum size” of the aggregate that is used.
Concrete Pump Types
#1 Squeeze Type Concrete Pumps
Over the last few years the modern trailer concrete pump for sale has undergone many refinements and improvements. During 1963, the squeeze-type model of concrete pumps was first developed in the U.S. With these pumps the concrete was placed inside a hopper and then fed into flexible pipes with the use of rotating blades. These flexible pipes are attached to a pumping chamber. a vacuum of around 600 mm of mercury is created in these pumping chambers. The vacuum maintains the cylindrical shape of the pipe, excepting when the pipes are squeezed by a roller.
This action maintains a flow of continuous concrete. The 2 rotating-rollers squeeze the pipe progressively which moves the concrete into a delivery pipe. In many cases the squeeze pumps are mounted onto trucks where the concrete can then be delivered via a folding-boom.
The hydraulic piston pump is now the more widely used pump used for concrete. Even though the exact specification of original and modern mechanically-driven pumps may differ, the working concept remains the same.
The concrete pumps feature three main parts which includes the following:
– Concrete Receiving Hopper
– Value System
– Power Transmitting System
Modern Concrete Pump Types
The concrete pump with mixers for sale are available in 3 main types:
– Mobile
– Trailer or Static
– Screed or Mortar Pump
Valve Types
The valve-system is the primary part of all mobile concrete pumps for sale.
Here is a list of main vale types:
– Sliding or Rotating Gate Valves
– Squeeze Type Valves
– Hollow Transfer Tube Valves
– Rock Valves
– Flapper Valves
The more commonly used valves are the hollow transfer tube valves. The rock valves are also a popular type of valve used for concrete pumping.