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How can concrete pumps take over to overcome back pressure?
Source: http://braprogram.com 2019-9-8 9:53:05

Concrete pump is a kind of mechanical equipment commonly used in construction. It has the incomparable advantages of mixing pump trucks. It can sensitively receive pumping in various messy construction sites without being affected by the environment. So how does the mixing pump upward overcome the back pressure? This is a problem that many construction parties are very concerned about.

Experts point out that when the concrete pump is laid straight up, during the pumping reversal or suspension of pumping, the concrete gravity in the pipeline will generate countercurrent pressure on the equipment. The higher the height of the straight pipe, the greater the back pressure. The pressure will reduce the concrete volume power, affect the displacement of the mixing and pumping machine, cause the concrete to segregate and block the pipe. Therefore, when laying the pipe straight up, try to overcome back pressure. The specific measures are as follows:

1. When the straight height is high or the location is limited, and it is difficult to balance the back pressure only by setting the horizontal pipe, a cannula (also called a valve cannula) should be installed between the conical pipe and the straight pipe of the delivery pipe, and the suspension The cannula was closed during pumping to prevent backflow of concrete.

2. When the straight height is low, a horizontal pipe of a certain length is set between the lower end of the straight pipe and the mixing ground pump. The back pressure is balanced by the friction resistance between the concrete in the horizontal pipe and the wall of the conveying pipe. Generally, the length ratio of the horizontal pipe to the straight pipe is 1: 3, and it should not be less than 15 meters.

3. When the straight height is high, a buffer elbow can be added in the middle of the straight pipe layering to use the frictional resistance between the concrete in the elbow and the pipe wall to balance the back pressure to prevent the concrete from flowing back.

It is important to note that the pipe wall thickness of the mixing pump needs to be inspected regularly during construction. If it is found that the wall thickness is abraded, it should be replaced immediately, and the conveying pipe at the higher pressure position should be replaced together. When pumping straight up to a height of more than 30 meters, a new, non-abrasive or thick-walled transfer pipe should be equipped near the pump, because the closer the pump is, the greater the pressure in the pipeline.

Receiving mixed pumps is very common in construction. How does the mixing floor pump up to overcome back pressure? With the above introduction, we trust that a wide range of users now understand this issue.

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