2) Control the amount of explosives at a time, from the "space" (distributed cloth) and "time" (segmental detonation), the total amount of the explosive area is evenly distributed to each blasting site, so that the explosive energy is maximized. Use, to minimize the ineffective energy consumed by the explosion shock wave.
3) Select a reasonable minimum resistance line direction and size, optimize the blasting parameters, and improve the charging structure (such as air-spaced segmented charge, cushion charge and uncoupled charge) to ensure the height and quality of the plug. The explosive energy of each pack is fully utilized.
4) Careful construction, grasping the four steps of topographic survey, geological survey, completion inspection and blasting construction to ensure design requirements.
5) Perform blasting under meteorological conditions that are conducive to the propagation of air shock waves, such as early morning, evening or open air.
6) The air shock wave in the roadway can be weakened by the means of “blockingâ€. For example, in the vicinity of the explosion area, brick walls, sandbags, masonry walls, etc. are constructed to block the wall. Some countries have used high-strength man-made films to make water packs instead of blocking walls. The water-filled water bag is in close contact with the roadway. When the shock wave comes, the water bag pressure increases, and it is transferred to the two gangs of the roadway, which increases the ability to resist shock waves. The hydraulic blocking wall has low cost, fast production, good anti-shock effect, generally can reduce the shock wave by more than 3/4, and can reduce dust and harmful gases.
7) When underwater blasting, an effective measure to reduce the intensity of underwater explosion shock waves is to use bubble curtain protection technology. It is to set up a bubble launcher at the bottom of the water between the explosion source and the protected object. Generally, steel pipes are provided with two rows of small holes on both sides thereof. When compressed air is input to the launching device, a large number of small bubbles are continuously emitted from the small holes. Under the effect of buoyancy, the bubble group rises from the bottom of the water to the surface of the water, forming a bubble curtain. It can effectively reduce the peak value of shock wave pressure and protect the protected object. After engineering verification, the effect is good.
Numbers & Alphabets Puzzle Mat
Numbers & Alphabets Puzzle Mat has a total of 10 pieces numbers 0-9 and 26 pieces alphabets A-Z.
Made from bright, assorted colors that can be easily arranged to you or your child's preference. Made out of high density Eva foam for the greatest durability and comfort. Eva foam is durable, non-toxic, premium foam that is lightweight and easy to assemble. It is also water, mold and mildew resistant which makes it easy to clean. Just wipe with damp cloth & mild soap. Build creative shapes too each letter and number can be removed from the baby puzzle mat for interactive learning, allowing children to develop gross motor skills, hand-eye coordination, logic, reasoning, and visual sensory growth. Use to design play areas in homes, schools, day cares, and more. Can also be used on walls around play area. The top of the foam puzzle mat is grooved with a non-skid bottom for ultimate safety and protection.
Numbers & Alphabets Puzzle Mat,Alphabet Number Puzzle Mat,Numbers & Letters Puzzle Mat,Non-Toxic Toys Mat,Baby Number Puzzle Mat,Eva Number Alphabet Puzzle Mat
Huizhou City Melors Plastic Products Co., Limited , https://www.melorsfloor.com