The use of concrete pump trucks must strictly abide by the specifications to avoid losses.
Specifically, the following “six nos” should be fulfilled:

1. The operator is not focused

The pump operator should concentrate on the pumping construction and always pay attention to the value of the pumping pressure gauge. Once the value of the pressure gauge suddenly increases, they should immediately reverse the pump for 2-3 strokes. exclude. If the reverse pump (positive pump) has been carried out for several operating cycles, and the blocked pipe has not been eliminated, the pipe should be disassembled and cleaned in time, otherwise the blocked pipe will be more serious.

2. Improper selection of pumping speed

When pumping, the choice of speed is very important, and the operator cannot blindly map fast, as the saying goes, haste is not enough. When pumping for the first time, the resistance of the pipeline is relatively large. At this time, it should be pumped at a low speed. After the pumping is normal, the pumping speed can be appropriately increased. When there is a sign of blocked pipe or the slump of a certain vehicle concrete is small, pumping at a low speed should be used to reduce the blocked pipe in the bud.

3. Inappropriate control of residual material

When pumping, the operator must observe the remaining material in the hopper at any time, and the remaining material should not be lower than the stirring shaft. If the remaining material is too small, it is easy to inhale air and cause the pipe to be blocked. The material in the hopper should not be piled up too much, and should be lower than the guardrail, so as to clean up the coarse aggregate and oversized aggregate in time. When the slump of a certain truck of concrete is small, the residual material can be lower than the mixing shaft and controlled above the “S” pipe or the suction port to reduce the mixing resistance, stirring resistance and suction resistance. This method is only applicable to “S” valve series concrete pumps.

4. The slump of concrete is too small to take improper measures

When it is found that the slump of a bucket of concrete is too small and cannot be pumped, the concrete should be released from the bottom of the hopper in time. Never add water to the hopper to stir.

5, downtime can not be too long

During the shutdown period, the pump should be turned on every 5-10 minutes (the specific time depends on the temperature of the day, the slump of concrete, and the initial setting time of concrete) to prevent pipe blockage. It is not advisable to continue pumping for the concrete that has been initially set after the downtime is too long.

6, the pipeline can not be uncleaned

After the last pumping is completed, the pipeline is not cleaned, which will cause the pipeline to be blocked during the next pumping. Therefore, after each pumping, the conveying pipeline must be cleaned according to the operating procedures.