Now concrete construction uses concrete pump to convey concrete to the designated pouring location through the concrete pump line. And the concrete pump pipe is also called concrete pump line. Its emergence has greatly improved the efficiency of concrete pouring. The following is a detailed introduction to the pump pipe(line).
Types of the Concrete Pump Line
The frequently-used pump line can be divided into three types: the straight line, the elbow line and the hose.
The straight line commonly has several types such as 1m,1.5m, 2m and 3m pump line. Then comes the elbow line. The elbow line most commonly used is 90-degree and 45-degree pipe.
Of course, there are other elbow pipes that the clients need to customize them according to their construction demands. Last is the hose, and generally the length of the hose is 3m.
Size of the Concrete Pump Line
The Pump lines are generally divided into 125 and 150, with inner diameters of 125mm and 150mm. These two kinds of pump lines also have the difference of high and low pressure. The low pressure model of 125 pump line is the outer diameter Φ 133, the high pressure model is the outer diameter Φ 140, while the low pressure model of 150 pump line is the outer diameter Φ 159, and the high pressure model is the outer diameter Φ 168.
Connection Mode of the Concrete Pump Line
Three Common Connection Modes
The connection of linear type is that the delivery pipeline is connected with the outlet of the concrete pump in a straight line.
The 180-degree connection (U-shaped connection) is that the two outlets of the pump are connected with the delivery pipeline through two 90-degree elbows.
The L-shaped connection is that the outlet of the pump is connected with the delivery pipeline through a 90-degree elbow and the pump line is perpendicular to the concrete pump.
Features of different Connection Modes
When the straight-line connection is adopted, the concrete is directly pumped into the delivery pipe from the S valve of the concrete pump, and the pumping resistance is small.
But when the concrete pump is reversed, the high-pressure concrete in the pumping pipeline and S valve will directly release the pressure to the concrete pump, so the concrete pump will be subjected to a large counter-acting force, resulting in a large impact on the hydraulic system.
When 180-degree connection is adopted, the pumping resistance is very large because the concrete outlet is directly connected with two elbows.
However, the counter-acting force on the concrete pump is buffered by the two fixed elbows, so the concrete is less impacted, and this buffering effect is particularly obvious when pumping upward.
When L-shaped connection is adopted, due to the use of an elbow, the pumping resistance and the reacting force of pump shrinkage are between the above two cases, however, since the direction of impact is perpendicular to the installation direction of the concrete pump, the concrete pump will cause transverse vibration.
Adoption of the different Connection Modes
In horizontal pumping, U-shaped or linear connection can be adopted; When pumping upward, especially the height is more than 15m or pumping downward, U-shaped connection should be adopted. If it is connected in a straight line, the concrete pump will bear the pressure released by the high-pressure concrete during reversing and the impact of the weight of the concrete in the pipeline.
The L-shaped connection is used for horizontal pumping, or when it cannot be connected by other methods due to topographic conditions, and it cannot be used for pumping upward in principle.
Layout Principle of the Concrete Pump Line
The layout of concrete pump line is a very common problem. In the construction process, following certain layout rules of pump line can reduce the occurrence of accidents in the project. What principles should be followed in the line layout of concrete pump? Specifically, it can be carried out from the following aspects.
In the process of laying the pipeline, the pipeline is not allowed to bear any external tension. Generally speaking, the pipeline layout should be laid according to the principle of the shortest distance and the fewest elbows.
The conveying pipeline should be placed at an accessible place for personnel to clean and replace it. And all pipelines must be firmly and stably connected. Besides, a firm fixed point shall be added at the elbow to avoid shaking and loosening of the pipeline during pumping.
When connecting the pump line, pay attention to the conical pipe at the outlet of the pump. It is not allowed to directly connect the elbow. Connect the straight pump pipe that is more than 3m before connecting the elbow.
At the same time, the conveying pipeline 3-5m away from the pump machine should be provided with a fixed device to absorb the counter-acting force generated by pumping concrete, so as to stabilize the pump and reduce the vibration of the concrete conveying pipeline.
In addition, the conveying pipeline directly connected to the conical pipe at the outlet of the pump must be fixed so that the disassembly and assembly of the pump line is convenient when the pumping stops and clean the pipeline every time.
The conveying pipeline near the pump and in the dangerous section where people want to enter should be provided with necessary shielding and protection to prevent casualties caused by rupture of the pipeline or loosening of the pipe clamp.
In summer, because the pipeline will overheat the concrete under the strong sunlight, which causes dehydration and blockage in a pipeline. Therefore, the pipeline should be covered with wet straw bags or other shielding materials in summer.
In winter, when the temperature is – 5 ℃, the conveying pipeline should be covered with straw bags for thermal insulation to ensure the concrete molding temperature.