Improving method and bell-mouthed type air ventilation structure of air vent of down-hole plane gate

Abstract

The invention discloses an improving method and a bell-mouthed type air ventilation structure of an air vent of a down-hole plane gate. A section of bell mouth is formed in the lower end face of a door lintel between lintel separation plates of a gate to serve as an air ventilation port. The lower end face of each section of bell mouth is flush with, welded and fixed to a lintel bottom plate. A round hole in the upper end of each section of bell mouth is directly connected with a round perpendicular steel pipe pre-buried in first stage concrete to form a bell-mouthed type air vent. The top endof the round perpendicular steel pipe is located at the top of a gate well and connected with a bulb type air ventilation cover through a flange, and round air vents are formed in the bulb type air ventilation cover. The top end of the round perpendicular steel pipe communicates with the outer edge of the downstream position of a vertical well through a bending pipe with the bending angle being larger than or equal to 90 degrees. According to the bell-mouthed type air ventilation structure, the lintel section can be inflated or deflated, occurrence of the phenomena that the gate vibrates andthe lintel section is cavitated is reduced, and guarantee of safe operation of the gate is facilitated.

Description

technical field [0001] The invention relates to a method for improving a vent hole of a down-hole plane gate and a bell mouth type vent structure, belonging to the technical field of metal structures of water conservancy and hydropower projects. Background technique [0002] For submersible plane gates, in order to improve the water flow pattern, prevent cavitation and vibration, and reduce the gate opening and closing force requirements, vent holes should be installed behind the gate in principle. The traditional method is to set vent holes in the concrete behind the lintel of the gate , for drainage or diversion tunnels with pressure-slope structures on the top, the gas in the lintel section cannot be replenished and discharged, and it is easy to induce gate vibration and cavitation in the lintel section, so the existing technology is still not perfect. Contents of the invention [0003] The purpose of the present invention is to provide a method for improving the ventil...

AI Technical Summary

Problems solved by technology

[0002] For submersible plane gates, in order to improve the water flow pattern, prevent cavitation and vibration, and reduce the gate opening and closing force requirements, vent holes should be installed behind the gate in principle. The traditional method is to set vent holes in the concrete behind the lintel of the gate , for drainage or diversion tunnels with pressure-slope structures on the top, the gas in the lintel section cannot be replenished and discharged, and it is easy to induce gate vibration and cavitation in the lintel section, so the existing technology is still not perfect

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