Aerification structure used for stepped overflow channel

Abstract

The invention relates to an aerification structure used for a stepped overflow channel, and belongs to the field of stepped overflow dams. The aerification structure used for the stepped overflow channel comprises a main air duct, an upper dispersed air duct, a lower dispersed air duct, a front aerification step and an initial step, wherein the upper dispersed air duct and the lower dispersed airduct which communicate with the main air duct are arranged on the inner side of the front aerification step and the inner side of the initial step correspondingly, and the other end of the upper dispersed air duct and the other end of the lower dispersed air duct communicate with the vertical face of the front aerification step and the vertical face of the initial step correspondingly. According to the aerification structure used for the stepped overflow channel, leaking water in the aerification step and the initial step can be discharged by means of negative pressure, and the internal temperature of concrete can be decreased, so that the surface flatness of efficiency facilities can be improved, and the early-stage strength of the concrete can be improved.

Description

technical field [0001] The invention relates to an aeration structure for a stepped spillway, in particular to a pre-aeration sill for the first step of a stepped spillway, especially suitable for aeration of high-speed water flow in a step spillway of the pre-aeration sill , belonging to the field of stepped overflow dams. technical background [0002] With the increase of high dams above 100 meters in the construction of modern water conservancy and hydropower projects in our country, the problem of high-speed large single-width water flow caused by high-speed large single-width flow and high head of discharge from high dams is becoming more and more serious. Although there is a pre-aeration sill for aeration, there is still a large negative pressure on the facade of the stepped spillway, especially on the part of the facade, which makes insufficient aeration and the low aeration concentration cannot be effective The protection of the step surface, especially the damage t...

AI Technical Summary

Problems solved by technology

During the concrete pouring process, the internal temperature of the concrete is higher than the external temperature, which is prone to temperature differences. If the internal temperature is not released in time, it will cause expansion cracks and affect the flatness of the aeration facilities, which will not only affect the performance, but more importantly, the possibility with devastating consequences for the dam

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