Nested type top overflowing gate

Abstract

A nested type top overflowing gate is mainly characterized in that a large gate leaf is in movable nested connection with a small gate leaf, and a flip bucket is arranged at the upper end of the small gate leaf in the downstream side direction, so that water flow can overflow from the top of the gate to form open weir flow, and water diversion capability can be improved while washout force is decreased; and clear upper-layer flood resources can be used to enter downstream along with main flow while bed load sediment is still blocked in an original riverway, and vibration of the gate caused by the washout force can be avoided. The nested type top overflowing gate is flexible and convenient to open and close and small in gate opening force. Meanwhile, the nested type top overflowing gate can be used normally on the basis of not changing other water gate buildings such as water gate bottom plates, gate piers and opening and closing equipment but the gate, and is less in investment, good in flood resource use effect and high in feasibility.

Description

Technical field [0001] The invention relates to a gate, especially a nested top flow gate, which is suitable for the storage and utilization of sediment-laden rivers and side flood resources. Background technique [0002] Generally, for areas beside the mainstream or tributaries of sediment-laden rivers, such as depressions, wetlands, ponds or flood storage areas, where flood resources can be used, it is necessary to introduce flood resources to the utilization area through appropriate diversion gates for follow-up The use of farmland irrigation, wetland conservation, and groundwater supplementation. The gates often used at present are single-leaf gates. According to its structure, it can be divided into plane gate, arc gate and so on. In areas where flood resources are used beside the river, the gates used are mainly common plane gates, such as plane steel gates. The flat steel gate is composed of three parts: the movable part of the door leaf, the buried part and the openin...

AI Technical Summary

Problems solved by technology

Although this kind of gate can store and introduce flood resources to the utilization area for farmland irrigation, wetland conservation, and groundwater replenishment, but because the gate is opened at the bottom, and the flood water level is higher than the normal water level, the scouring force is relatively strong. The outflow and diversion of the orifice is small and difficult to control; and when the gate is opened from the bottom, because the sediment concentration of the river in the flood season is higher than usual, the water with a higher sediment concentration will be introduced into the utilization area, resulting in sediment deposition and silt irrigation; because the control of the flow rate of the gate is realized through the change of the opening height of the gate, the force of opening the gate becomes larger due to the water pressure on the gate panel, and it is difficult to open the gate, and the water flow from the lower part of the gate Overcurrent can easily cause the gate to vibrate and wash the gate groove; and since the gate is opened from the bottom position, the water flow will form an underflow energy dissipation after entering the gate, and the kinetic energy carried by the water flow and Potential energy is consumed to reduce the erosion of the channel, but there are disadvantages such as long consumption facilities and large construction volume; at the same time, most of these gates use the original planar gates of the water diversion gates, or stacked beam gates, Rather than a gate specially suitable for the utilization of flood resources in rivers with many sediments

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