2. When vibrating the upper concrete with a vibrator, it should be done before the initial setting of the lower concrete. Each insertion point should master the quasi-vibration time, which should be too short and not too dense, and the time should be between 20 and 30 s, and the concrete surface should be horizontal in general. There is no obvious settlement, bubbles and mortar on the surface.
3. The insertion points of vibrators should be evenly arranged, and they can be moved in the order of "determinant" or "staggered" (see the figure below), but they cannot be mixed. The distance of each moving position should not be greater than 1.5 times the action radius of the vibrator.
Extended data:
Don't touch the vibrator: A. Don't touch the template when the vibrator vibrates. The distance between the concrete vibrator and the template should not be greater than 0.5 times of the action radius of the concrete vibrator, and should not be close to the template; B, vibrator vibrating don't touch the steel bar; C, don't touch the embedded parts when the vibrator vibrates. When the vibrator vibrates near the template, tap the template with a mallet at the same time, and tamp it with iron solder at the reinforcement and corner of the template.
The vibration time of vibrator should not be too long. If it is too long, the concrete will separate from the cement, the stones will sink, and a sand layer will be formed on the concrete surface. When the vibrator inclines the concrete surface, it should move slowly from the lower part to the higher part to ensure the vibrating compaction.
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