Automatic sediment division and ejection structure with headwork annular irregular section

Abstract

The invention provides an automatic sediment division and ejection structure with a headwork annular irregular section. The automatic sediment division and ejection structure is composed of a rectangular section, a water inlet, a connecting section, an irregular section, a top plate, an outside plate, an inside plate, a base plate, a sediment collection slot, a trapezoidal section, a sediment discard section I, a sediment discard port, a major diameter vertical barrel, a barrel top cap, a barrel bottom plate, a sediment discard section II, an output section, a diversion canal and a communication pore. The automatic sediment division and ejection structure with the headwork annular irregular section is used for sediment division, large space is not required for sedimentation, and the clearing and transport of sediment are not required; water flow with high sediment concentration can be automatically returned to an original river channel in the sediment division process, and the site, manpower and cost are saved; the sediment ejection effect is good; and the structure can also be buried underground under the proper conditions, so that a ground position is not occupied.

Description

Technical field [0001] The invention belongs to the technical field of water conservancy engineering, and specifically is a canal head ring-shaped special-shaped cross-section automatic sand separation structure. Background technique [0002] In most water diversion irrigation areas in northern China, sediment transport and its control have always been a difficult problem for people who design irrigation systems. The water diversion channels of these irrigation areas often have serious sedimentation; according to the statistics of the Yellow River irrigation areas from 1958 to 1990 In fact, 30.8% of the sediment in Henan Province is deposited in the diversion canal system, compared with 38.5% in Shandong Province. Under the current diversion engineering technology, it is difficult to transport all the sediment over long distances, and a large amount of sediment is deposited in the channel, which is serious. It affects the water delivery efficiency and normal operation of the irri...

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Problems solved by technology

[0002] In most water diversion irrigation areas in northern China, sediment transport and its control have always been a difficult problem for those who design irrigation systems. Sediment is often seriously deposited in water diversion channels at all levels in these irrigation areas; According to the current situation, 30.8% of the sediment in Henan Province is deposited in the water diversion canal system, and 38.5% in Shandong Province; It affects the water delivery efficiency and normal operation of the irrigation district. Therefore, many irrigation districts spend a lot of manpower, material resources and financial resources on dredging the channel every year; The wind causes sand to fly all over the sky, which seriously damages the local ecological environment; the grit chamber is currently the main way to deal with sediment in most irrigation areas in China, but the grit chamber occupies a large area and has a short service life. At present, the upstream areas of most irrigation areas have basically There is no expandable sand sinking depression, and it is urgent to find new ways to control sediment in irrigation areas; sand discharge vortex tubes, sand discharge funnels and other sand discharge facilities have shown good sand discharge and water saving effects in application, but their applicable conditions are relatively poor. Strict, the sand discharge vortex requires the Froude number of the channel water flow to be 0.7-0.95, mainly for the moving sediment; the sand discharge funnel has relatively strict requirements on the water flow; technicians have also carried out a lot of research and improvement on the existing technology, For example, the Chinese patent CN 101775791 B circular middle ring water and sand separation device, but it only combines conventional sedimentation and filtration, the filtration is slow, the cost is high, and the deposited sediment still needs to be washed regularly, and it cannot continuously separate sand for water supply; Chinese patent CN204469295 U A cylindrical spiral flow water-sand separator and CN 2127041Y water-sand separator both belong to the use of high-speed rotation of water to separate water and sand. The principles of the two types of patented technologies represented by the two small devices are completely opposite. The sand-laden water flow rotates, and the sand with a high specific gravity will be thrown to the outer circle. The other type thinks that when the sand-laden water flow rotates, the outer circle is clear water and the inner circle is sand. Therefore, the scientific basis of these two types of patented technologies still needs to be verified by theory and practice.

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