1. The Blockage of Concrete Delivery Pipes Caused By Improper Operation
1.1 The Operator Is Inattentive.
The concrete pump operator should concentrate on the pumping and always pay attention to the reading of the pumping pressure gauge. Once the reading of the pressure gauge is found to increase suddenly, the operator should immediately reverse the concrete pump for 2-3 strokes. . If the reverse pump has been operated for several cycles and the blocked pipes have not been eliminated, the concrete delivery pipes should be cleaned in time, otherwise the blocked pipe will be more serious.
1.2 Wrong Pumping Speed
When pumping, the choice of speed is critical and the operator cannot blindly pursue higher speed. Due to the large resistance of the pipeline, it should be pumped at a lower speed when pumping for the first time. After the pumping is normal, the pumping speed can be appropriately increased. When there is a sign of a blocked pipe or the slump of a certain concrete is small, it should be pumped at a low speed to prevent the blockage in advance.
1.3 Inappropriate control of Concrete Material
The operator must observe the remaining concrete material in the hopper at any time during concrete pumping. The remaining concrete should not be lower than the mixer shaft. If the remaining concrete is too less, it is easy to inhale air and cause concrete delivery pipes to be blocked. The concrete in the hopper should not be piled up too much as well. It should be lower than the grid.
1.4 Longer Downtime
During the shutdown period, the concrete pumps should be turned on every 5-10 minutes to prevent the blockage of the concrete delivery pipes It is not advisable to continue pumping concrete that has been initially solidified if the downtime is too long.
1.5 Dirty Concrete Delivery Pipes
After each pumping, the concrete pump pipeline must be cleaned according to the operating procedures.
2. Concrete Delivery Pipe Blockage Caused By Wrong Connection
The Concrete Delivery Pipes should be laid according to the shortest distance, and the least quantity of concrete pump elbows so as to reduce the delivery resistance and the possibility of blocking as much as possible.
When the pipe is connected during pumping, only one pipe can be connected at a time. The inner wall of the pipe should be lubricated with water firstly, and the air should be exhausted, otherwise, the pipes will be easily blocked.
The concrete pump reducer pipe at the pump outlet is not allowed to be directly connected to the concrete pump elbow. It should be connected to a straight concrete delivery pipe of more than 5mm before connecting the elbow.
3. Pipe Blockage Due To The Segregation
of Concrete Mortar
Sometimes the pipe blocking is caused by the separation of the concrete mortar if the mortar is in direct contact with the water in the concrete pump pipeline.
The preventive measurement: Loosen the concrete pump pipe clamp couplings from the lowest point of the pipe and let out all the remaining water after cleaning the pipes with water. Put a sponge ball to separate the water from the concrete.
4. Pipe Blockage Caused By Part of Concrete Leakage
4.1 The joint of the concrete pump pipe is not tightly sealed. The pipe clamp is loose or the seal gasket is damaged to cause leakage.
4.3 If the water is turbid or there is mortar in the water tank, it means the concrete pump piston has been worn. At this time, the concrete piston should be replaced in time, otherwise, the concrete delivery pipe will be blocked due to leakage and pressure loss .
4.2 When the wear plate and cutting ring are severely worn, the gap between them becomes larger. The gap between the wear plate and the cutting ring must be narrowed by adjusting the special-shaped bolts.
4.4 If the water in the water tank quickly becomes turbid after a new piston replacement, it means the concrete delivery cylinder is worn. Then the concrete delivery cylinder needs to be replaced.