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Dam type/performance | Hydraulic elevator dam | Hydraulic lifting dam |
Landscape effect | Concealed support, low center of gravity, neat and clean dam, good landscape effect. | There are more support rods behind the dam, and the landscape effect is moderate. |
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Emergency unpowered dam lowering. | In the absence of electricity and any power source, it is possible to achieve manual and direct dam lowering without power. The manual system allows for single or multiple dams to simultaneously lower the dam for flood discharge, and its lowering speed can be freely controlled to ensure absolute high reliability and safety. | The support rod needs to be unlocked before the hydraulic system can be activated, and the power of the double acting main hydraulic cylinder must be supplied with electricity, which cannot achieve unpowered dam lowering. |
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Drifting and sand discharging effect | There is no need to install a trash rack upstream. When there are floating objects and sediment in the upstream, the single fan dam surface can be adjusted slightly, and the floating and sediment can pass smoothly. The sand and drift removal effect is very good. | It can be adjusted by a single fan or as a whole dam surface, with good drainage effects for drift and sand, but the gate chamber needs to be cleaned after flood discharge. |
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Impact resistance | The driving mechanism bears the weight of the dam surface and water, and has strong impact resistance. | The panel material is a thin-walled reinforced concrete structure with average impact resistance. |
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Anti-freezing effect | The hydraulic system is free to expand and contract, effectively reducing the impact of the pressure caused by winter ice, and the anti-freezing effect is good. | The reinforced concrete thin-walled panel is easy to be cracked, the slender support bar is under ice pressure, easy to bend, and the anti-freezing effect is poor. |
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Whether can stop water at any height or not | Plunger hydraulic cylinder for any water-stopping height | The unlocking device on the supporting rod can achieve water stopping at any height. |
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Lifting dam speed | The lifting and lowering of a single dam surface can be completed within 30 seconds, with an astonishing speed of lifting and lowering movement | The lifting time of a single span dam body is greater than 5 minutes, and the time is proportional to the length and width of the dam body. |
Whether single fan can be opened, and multiple fans can be regulated simultaneously or not | It can be opened with a single fan to achieve small water discharge, or all dam surfaces can be adjusted together to raise or lower the water storage height. It is a simple and flexible way to operate at will. | Simultaneous regulation of single-fan and multi-fan can be realized |
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Ease of operation and automation upgrade | The oil pipeline layout is simple, the operation is simple, and the entire water system network platform can be achieved to achieve remote monitoring and control of multiple and remote locations. A remote server can be established to achieve remote automatic alarm function. | There is a support and hydraulic locking system, and the two systems are interconnected in motion. The pipeline layout is complex, and remote monitoring operations are very complicated. |
Maintenance and management | Open steps, all hydraulic components are exposed for easy maintenance, and can be repaired or replaced with water. | Due to the hydraulic opening and closing oil cylinders and unlocking devices being located in deep pits, long-term operation can easily cause blockage, thereby affecting the normal lifting and lowering of the dam surface. |
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