Closure gap vertical closure flow intercepting method

Abstract

The invention provides a closure gap vertical closure flow intercepting method which is characterized in that after a pre-entering stage, throwing materials falling from a dike head are flatly laid and stacked into a bottom protection stacking body in the range from the dike axis to a downstream slope toe of a transverse cofferdam through water flow driving force, the throwing materials mainly comprise materials with the equivalent sphere diameter D2, and the equivalent sphere diameter D2 is smaller than the equivalent sphere diameter D2; the starting flow velocity of the material is smaller than Va, the stopping flow velocity of the material is larger than Vb, Va is the water flow velocity at the falling position of the throwing material, Vb is the water flow velocity at the end position, close to the downstream, of the set transverse cofferdam, gamma s is the density of the material, gamma is the density of water, and K starting and K stopping are the starting coefficient and the stopping coefficient of the material respectively; g is gravitational acceleration.

Description

technical field [0001] The invention relates to a vertical plugging and intercepting method for a longkou, in particular to a vertical plugging and intercepting method for hydraulically driven flat bottom protection, and belongs to the technical field of riverbed closure construction and cofferdam filling in water conservancy and hydropower projects. Background technique [0002] Water conservancy and hydropower project construction interception refers to intercepting the original riverbed water flow, guiding the water flow to the diversion and drainage structures, and then filling the upstream and downstream horizontal cofferdams in the river course, thereby creating dry construction conditions for the main building construction. Most of the water conservancy and hydropower projects in western my country have the characteristics of narrow river valleys, large flow, turbulent water flow, and deep river bed overburden. The closure construction mainly includes three closure me...

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Problems solved by technology

[0005] The problem to be solved by the present invention is to solve the need to prepare large-scale and sufficient throwing materials and to have a large-area throwing material storage site in order to solve the problem of neutral blocking and interception in the existing interception construction, so that for narrow river valleys, it is often It is difficult to meet the problems of complex construction procedures, high construction costs, and difficult positioning of thrown stones, and a method of vertical blockage and closure is provided.

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