Requirements for concrete pouring and vibration

The free fall height of concrete from the feeding port shall not exceed 2 meters, and measures must be taken if it exceeds 3 meters.

When pouring concrete, it should be carried out in sections and layers continuously. The pouring height of each layer should be determined according to the structural characteristics and the degree of steel bar density. Generally, the layer height is 1.25 times the length of the vibrating part, and the maximum should not exceed 50 centimeters.

3. When using an insertion vibrator, it should be inserted quickly and pulled slowly. The insertion points should be evenly arranged, moved point by point, and carried out in sequence without omission, achieving uniform compaction. The distance between movements should not exceed 1.5 times the radius of action of the vibrating rod (usually 30-40cm). When vibrating the upper layer, it should be inserted 5cm into the lower layer to eliminate the gap between the two layers.

4. The pouring of concrete should be carried out continuously. If an interval is necessary, the interval time should be shortened as much as possible, and the second layer of concrete should be poured before the initial setting of the previous layer.

5. When pouring concrete, it is necessary to regularly observe whether the formwork, steel bars, reserved holes, embedded parts, and reinforcing bars have moved, deformed, or blocked. If any problems are found, pouring should be stopped immediately, and they should be corrected before the poured concrete sets.