What is concrete pumping guidelines for high-rise buildings? Before construction, the pumping plan and process should be optimized and clarified to reduce errors in work. In super high-rise buildings, the water-saving and pipe-running method is more commonly used, that is, pumping a small amount of water, then adding pure cement slurry, pumping mortar, last pumping concrete.
Preparation Before Pumping
First, add a certain amount of water to the pumping pipeline, isolate the mortar from the water running the pipe with pure cement slurry, and rely on the mortar to form a barrier between the concrete and the pure cement slurry.
Then pump the various materials separately. Into the conveying pipe, the water will wet the conveying pipe wall, and form a layer of cement slurry film inside the conveying pipe to achieve a pumpable state.
When pumping concrete in a super high-rise building, due to the large length of the conveying pipeline, the pumped mortar and water have not been completely pumped out, resulting in too thin pipe-running mortar. If the pump stops for a long time, the direct contact between water and mortar for a long time to cause the mixing of the water and mortar. So that the water retention performance will be lost, sand will deposit and separate from cement slurry. The friction resistance increases and finally causes the pipe blocking.
The water-saving pipe-running method (adding a pure cement slurry layer between the pipe-running mortar and water to separate the mortar and water to reduce the risk of mortar segregation) can reduce the occurrence of this phenomenon and enable the concrete to be pumped smoothly to the specified location and reduce pumping losses.
Pumping Concrete Steps
- Pump a small amount of water first
- Pumping pure cement slurry
- pump mortar
- Pump concrete