1. When the shotcrete is used to spray concrete, the water-cement ratio and the amount of accelerator must be strictly controlled. After spraying, the surface of the sprayed layer should be smooth, dry, or free from dripping.
2. The shotcrete should be divided into sections, sections, and blocks, and the arching should be carried out on the first wall and then on the bottom. The length of the section is not more than 6m, and the division is first and then up. The section size is 2m×2m, so as to reduce the occurrence of sliding or shedding of concrete caused by gravity.
3, when spraying concrete, it can move forward spirally, it can also use S-shaped back and forth to move forward.
4. Control the distance and angle between the nozzle and the sprayed surface. The distance is 0.6~1.2m. It is appropriate to increase the rebound amount when it is too big or too small. The nozzle is perpendicular to the sprayed surface and slightly deflected to the just sprayed part ( The tilt angle should not be greater than 100), the springback is minimal, and the spray effect is best. For rock face depressions, spray and multi-spray should be used first, and the protrusions should be sprayed or less sprayed.
5, adjust the wind pressure, water pressure, air pressure is too large, the rebound increase, too small concrete poor compaction.
6. The spraying operation should be carried out in a layered manner. One shot is too thick, which will cause expansion and affect the adhesion and cohesive force of concrete. It is easy to cause separation or dislocation due to its own weight and cause large slump; one shot is too thin, then rough. The aggregate should not be firmly bonded and increase the rebound. Therefore, a shot that is too thick or too thin has an effect on the jet quality, but the initial shot thickness must not be less than 4–6 cm.
7. After the shotcrete operation is completed, the accumulated material in the sprayer and the transfer pipe must be promptly removed.
8. The shotcrete operation must follow the excavation surface. The time between the next blasting and the shotcrete work surface completion time must not be less than 4h.
We diviided the led light according to the using eviiroment. Most of our product is the commercial LED Lighting
Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
While the focus of residential lighting is often on aesthetics, commercial lighting is task orientated. Commercial lighting systems are designed based on what the application is. For example, in an office-type setting, you may see task lighting, which illuminates specific areas where employees need concentrated light to be able to perform their jobs.
Magnetic Spotlight,Magnetic Track Spotlight,Magnetic Track Led Spotlight,Magnetic Double Head Light
Jiangmen Dilin Lighting High-Tech Co., Ltd. , https://www.jmdilinlighting.com