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The deflected nose sill used for flood discharge of high arch dam body

A technology for high arch dams and flood discharge, which is applied in the field of deflection nose sills. It can solve the problems of threatening the safety of the geological foundation of the dam, the impact force of the downstream riverbed, and the inability of water flow to spread, so as to avoid erosion, increase the water entry area, and facilitate mixing. gas effect

Active Publication Date: 2018-10-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing deflecting nose sills used for flood discharge of high arch dams are all equal width or narrow slits. When the dam discharges floods, this type of deflecting can not make the water flow fully diffuse in the air, and the water inflow per unit area is large. , the impact force of the water tongue on the downstream riverbed is very large, which often causes severe incision of the riverbed, threatening the safety of the geological foundation of the dam. It is necessary to build expensive cushion ponds and secondary dams to buffer the impact of the discharged water flow, which cannot be realized. Layout scheme of natural water cushion pond without slope protection without bottom protection and without secondary dams

Method used

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  • The deflected nose sill used for flood discharge of high arch dam body
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  • The deflected nose sill used for flood discharge of high arch dam body

Examples

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Effect test

Embodiment 1

[0035] In this embodiment, the deflecting nose sill of the first structure of the present invention, that is, the retractable deflecting nose sill is used in a large arch dam project for flood discharge and energy dissipation in the surface hole and middle hole of the high arch dam body. The specific layout is 1 surface hole and 2 middle holes. The center line of the surface hole is parallel to the center line of the river channel and on the same vertical plane. Inside, the angles between the centerlines of the two middle holes and the middle line of the river are the same, about 5°.

[0036] The structure of the retractable nose sill and the flow pattern of the deflected flow are as follows: Figure 1~5 As shown, it is composed of a bottom plate 1 and a first side wall 2 and a second side wall 3 respectively combined with the two sides of the bottom plate. The arc section of the bottom plate includes the arc-shaped water passing surface 1-1-1 and the first side 1-1-2 and the...

Embodiment 2

[0041] In this embodiment, the combination of shrinkable flow-deflecting nose sill and diffused-type deflecting flow nose-sill is used in a large-scale arch dam project for flood discharge and energy dissipation in the middle hole of the body surface of a high arch dam. The specific layout is 1 surface hole and 2 middle holes. The surface hole adopts a diffused deflecting nose sill. The center line of the surface hole is parallel to the middle line of the river and is on the same vertical plane. The two mesoholes are arranged axisymmetrically with the center line of the river channel as the axis of symmetry, and in the same plane, the angle between the center line of the two mesoholes and the center line of the river channel is the same, about 3°.

[0042] The structure of the retractable nose sill and the flow pattern of the deflected flow are as follows: Figure 1~5 As shown, the retractable nose sill is composed of a base plate 1 and a first side wall 2 and a second side wa...

Embodiment 3

[0048] In this embodiment, the retractable deflector nose sill is used for the flood discharge and energy dissipation of the high arch dam body surface of a large arch dam project. The specific layout is 1 surface hole and 2 middle holes. The center line of the surface hole is parallel to the middle line of the river channel and on the same vertical plane. The central line is inclined, and the angle between the centerlines of the two central holes and the central line of the river is the same, about 5°.

[0049] The structure of the retractable nose sill and the flow pattern of the deflected flow are as follows: Figure 1~5 As shown, it is the same structure as the retractable nose sill described in embodiment 1.

[0050] The dimensions of the retractable deflector nose sill used for the surface hole are as follows: the length L of the arc-shaped water surface of the arc-shaped section of the bottom plate 1 =10.47m, width B=6m, arc radius R 1 = 120m; angle β between the too...

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Abstract

The deflecting nose sill used for flood discharge of high arch dams according to the present invention is composed of a base plate and a first side wall and a second side wall respectively combined with the two sides of the base plate. The circular arc surface section and the inclined surface section tangent to the arc surface section are composed of the arc surface section of the bottom plate including the arc-shaped water passing surface and the first side and the second side on both sides of the arc-shaped water passing surface. The first side and the second side are both vertical planes, and the slope section of the bottom plate includes a toothed water passage surface, which is composed of a middle tooth and symmetrically distributed on both sides of the middle tooth and the first side teeth and the same size. The second side teeth are formed, the roots of each tooth are connected to the arc surface segment, and the length of the middle teeth is greater than that of the side teeth. The deflecting nose sill of the present invention can make the water flow in the middle hole on the surface of the arch dam fall into the water in different regions, diffuse vertically, and reduce the water inflow per unit area, so as to realize the natural water cushion pond layout scheme of "slope protection but no bottom protection and no secondary dams" , Simplify project layout and save project cost.

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation facilities in water conservancy and hydropower projects, and in particular relates to a deflector nose sill used for flood discharge of a high arch dam body. Background technique [0002] Arch dam projects in Southwest my country have the characteristics of high water head, narrow valleys and deep overburden. Usually, the layout scheme of "water cushion pond + second dam" is adopted, which requires the construction of large-scale and expensive water cushion ponds and second dams. . However, for narrow valleys with deep overburden, due to the deep water cushion downstream, the impact pressure on the bottom of the pool pond is relatively small, and the volume of water in the energy dissipation zone is large enough to dissipate the energy released. The relative position of the surface hole and the middle hole of the dam realizes the water flow in the middle hole of the surface to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/06
CPCE02B8/06
Inventor 王磊刁明军孙浩淼薛宏程
Owner SICHUAN UNIV
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