Causes of cracks in straightened steel bars
2020-01-02 13:04:06
Reinforcement machine straightening steel reinforcement sometimes cracks occur in the work is often the problem as long as you avoid some mistakes in the work process can avoid straightening the steel sometimes cracks, the following Luzhou Jintong Machinery Co., Ltd. analysis appears What are the reasons for this situation and the issues that must be followed in the course of operations in the future?
1, early demolition of the steel bar straightening machine construction.
2, too little design reinforcement, less than the minimum reinforcement ratio or the board is too thin.
3, the surrounding constraints of the board, the four corners of the board negative moment structure ribs with too little.
4. Pre-embedded pipelines in the slab have too many reductions in cross-section or are not dense in the pipeline.
5, shrinkage: the amount of cement is too large, with fine sand, maintenance is not in time or time is too short, and the vibration is not dense and so on.
The use of the machine must be smooth, the feed chute should be straight, and it should be aligned with the center line of the guide tube, the straightening tube and the undercut hole. The motor must be provided with a reliable zero protection. According to the diameter of the straightening bar, the straightening block and the speed are selected. The bars that are straightened shorter than 2m or greater than 9mm in diameter should be carried out at low speed. Before the straightening block is fixed, the steel bar must not be penetrated before the protective cover is covered. It is forbidden to open the protective cover and adjust the gap during operation.
The steel bar must be put on the ring holder to be stable, and when the wire or the steel bar is off the frame, it must be shut down. The steel bars that have been straightened must be divided into small bundles according to specifications and number of roots. Scattered steel bars should be cleaned and stacked at any time.
1, early demolition of the steel bar straightening machine construction.
2, too little design reinforcement, less than the minimum reinforcement ratio or the board is too thin.
3, the surrounding constraints of the board, the four corners of the board negative moment structure ribs with too little.
4. Pre-embedded pipelines in the slab have too many reductions in cross-section or are not dense in the pipeline.
5, shrinkage: the amount of cement is too large, with fine sand, maintenance is not in time or time is too short, and the vibration is not dense and so on.
The use of the machine must be smooth, the feed chute should be straight, and it should be aligned with the center line of the guide tube, the straightening tube and the undercut hole. The motor must be provided with a reliable zero protection. According to the diameter of the straightening bar, the straightening block and the speed are selected. The bars that are straightened shorter than 2m or greater than 9mm in diameter should be carried out at low speed. Before the straightening block is fixed, the steel bar must not be penetrated before the protective cover is covered. It is forbidden to open the protective cover and adjust the gap during operation.
The steel bar must be put on the ring holder to be stable, and when the wire or the steel bar is off the frame, it must be shut down. The steel bars that have been straightened must be divided into small bundles according to specifications and number of roots. Scattered steel bars should be cleaned and stacked at any time.
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