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The container air shield dam is a new type of hydraulic structure that combines the advantages of rubber dam and steel plate dam. The dam was developed by the United States in the 1990s. In 2008, the Ministry of Water Resources included the air shield dam in the national promotion plan. The air shield dam absorbs the essence of traditional movable dams and abandons the shortcomings of traditional movable dams. It has the characteristics of simple structure, short construction and installation period; outstanding flood control and flood crossing capabilities, safe and reliable operation; continuous control of water height and operation status; stronger pollution cleaning and silt removal capabilities; higher water retaining and water passing capabilities; short filling and discharge time, simple operation and management; ultra-long service life, high comprehensive benefits; strong earthquake resistance, high adaptability to foundations; good landscape effects, etc. Features of air shield dam 1. The water level can be accurately and automatically controlled even without electricity (especially suitable for hydropower generation); 2. Modular design can simplify the installation process and reduce later maintenance; 3. Simple structure, low cost, no water blocking, no water leakage; 4. Ultra-thin appearance, can well discharge floods, pass ice and debris, etc.; 5. The guard plate can well protect the rubber airbag from floating objects and debris; 6. The gate system can achieve automatic control, low power consumption, and cost saving; 7. The control system uses air as the inflation medium, there is no oil leakage problem, and will not cause water and surrounding environment pollution. Advantages of air shield dam: 1. Simple structure and easy installation. The unitized and modular structure does not require the use of large construction equipment, saving manpower, material resources, and financial resources, and the construction period is short. 2. It has sufficient safety. The steel shield fully protects the rubber dam bag, and the dam bag can provide sufficient buffering force, and is not afraid of the sudden impact of large floating objects. 3. The ecological landscape effect is good. The overflow of the dam top will form a waterfall, which is very beautiful.4. Low management and operation costs. No jamming will occur during operation, and no frequent maintenance and repair is required. 5. Strong sewage and silt removal capabilities. When the dam collapses, the shield is completely attached to the foundation, and the water blocking height is less than 9 cm. 6. Stronger earthquake resistance. The shield and the foundation are softly connected, and the system will not fail or lose normal operation capabilities due to foundation deformation. 7. Wide range of applications. Applicable to various rivers with complex hydrological conditions and urban beautification construction. It can also be directly applied to the transformation of various rubber dams and automatic flap dams.
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