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Before using concrete, it needs to be stirred first, so what are the specifications and models of concrete vibrating rods?
1. What are the specifications and models of concrete vibrating rods?
Commonly used specifications are: 50 mm and 30 mm, of which the vibrating rod models with 50 specifications are 35, 50, 70, 85, 100 and so on. Usually in use, the amplitude of vibration is eight to nine times the radius of the vibrating rod, which is about three hundred millimeters.
2. Precautions for the use of concrete vibrating rods
1. Before use, check whether the connection of the socket is standardized. If the vibrator still does not respond after plugging in the power supply, you can tap the vibrator on concrete vibrator poker the ground and wait until there is a sound or vibration before you can start using it. .
2. During the operation, the correct way to use it is to insert the vibrating rod into the concrete at 90 degrees and stir it for a while. You can twitch up and down during operation.
3. If there is a layered situation, the stirring of the vibrating rod can eliminate the seams between the layers and form a sense of integrity.
4. The vibrator needs to be closed and rested for a while after using it for 30 minutes, otherwise it is easy to damage the device due to heat.
5. In order to avoid damage to the hose during use, it is best to use a vibrating rod with a curvature and a radius greater than 500 mm.
6. After the cumulative operation time of the vibrating rod reaches 50 to 100 hours, it is necessary to disassemble the internal parts for cleaning. When disassembling, you can unscrew the tip and hose, and then take out the roller cone, bearing, oil seal, etc. . After cleaning, just put it back in place.
7. If damaged parts are found during the disassembly process, they need to be replaced in time. Only the bearings of the parts need oil, and other parts must not have oil stains attached to them.
The vibrating range of the concrete vibrator is 300MM, so the spacing of vibrating in the concrete cannot be greater than 500MM.
1) When the concrete is poured in layers, the thickness of each layer of concrete should not exceed 1.25 times that of the vibrating rod; when vibrating the upper layer, it should be inserted into the lower layer for about 5cm to eliminate the joint between the two layers. When the upper layer of concrete is placed, it should be carried out before the initial setting of the lower layer of concrete (see the figure below).
1—Poured concrete;
2—Concrete that has been vibrated but not yet initially set in the lower layer;
R—effective radius of action of the vibrator;
L—the length of the vibrator
2) The insertion points of the vibrator should be arranged evenly, and can be moved in a "determinant" order, and should not be mixed to avoid confusion and leakage of vibration. The distance of each moving position should not be greater than 1.5 times the action radius R of the vibrating rod. Generally, the radius of action of the vibrator is 30 to 40 cm.
Arrangement of insertion points, R - the radius of action of the vibrating rod
When the vibrator is used, the distance between the vibrator and the formwork should not be greater than 0.5 times of the action radius of the vibrator, and it should not vibrate close to the formwork.
The vibrating time of each insertion point is preferably 20 to 30 seconds. Generally, the concrete surface is level and there is a uniform grout and no air bubbles are formed. It does not sink significantly, indicating that it has been vibrated, and the vibrating can be stopped.
