CN209779578U - Flood discharge and energy dissipation structure of gravity dam with narrow river valley, deep tail water and super-large single-wide flow curve - Google Patents
Flood discharge and energy dissipation structure of gravity dam with narrow river valley, deep tail water and super-large single-wide flow curve Download PDFInfo
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- CN209779578U CN209779578U CN201920369420.5U CN201920369420U CN209779578U CN 209779578 U CN209779578 U CN 209779578U CN 201920369420 U CN201920369420 U CN 201920369420U CN 209779578 U CN209779578 U CN 209779578U
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Abstract
The utility model discloses a narrow river valley, dark tail water, flood discharge dissipation structure of super large single wide flow curve gravity dam, the overflow dam section of curvilinear figure gravity dam comprises the partition mound that curvilinear figure overflow weir and its weir crest erect, forms the table hole that overflows that satisfies the drainage requirement, connects fan-shaped bailing formula efflorescence pond behind the curvilinear figure overflow weir, and the efflorescence tail bank is the arc form, is the concentric circles with the dam axis. And a flaring pier is additionally arranged at the tail position of the overflow surface hole partition pier. The fan-shaped scoop type absorption basin is composed of a straight section and a slope section. The shape of the flaring pier is T-shaped, Y-shaped or X-shaped, and the two-dimensional water flow in the scoop pool can be changed into stable and complete three-dimensional scoop jump. The utility model discloses simple and practical, operation are convenient, can practice thrift engineering cost by a wide margin, can solve narrow valley, dark tail water, super large single wide flow hydraulic and hydroelectric engineering's flood discharge energy dissipation problem effectively.
Description
Technical Field
The utility model relates to a flood discharge dissipation structure of curve gravity dam, especially a flood discharge dissipation structure that is used for narrow river valley, dark tailwater, super large single wide flow curve gravity dam.
Background
The large discharge capacity, the large single width flow and the narrow river valley are one of the ubiquitous technical characteristics of large-scale water conservancy and hydropower engineering in China, in order to meet the flood discharge requirement of the engineering, the overflow front edge of a dam body needs to be arranged into a curve form, and if the engineering adopts a gravity dam, a curve gravity dam is formed. The curve gravity dam of the existing engineering usually adopts an underflow or trajectory energy dissipation mode, and when the single width flow is large, if the underflow energy dissipation is directly adopted, because the Froude number is small, wavy hydraulic jumps and swing hydraulic jumps are often formed, and the energy dissipation effect is poor. Because the single width flow is large and the river valley is narrow, the stilling pool is usually longer in length and deeper in depth, so that the engineering quantity can be increased, and the whole construction period can be prolonged. The method has the advantages that the trajectory jet energy dissipation is adopted, the requirement on downstream geological conditions is high, the trajectory jet high-speed jet can directly impact a bank slope and strongly reflux to scour the geology of the bank slope, the bank protection and slope protection projects need to be considered when the reflux flow rate is too high, the downstream deposits of a pit are more, and the influence on the power station output is avoided. When the tail water at the downstream is deeper, a scoop-type stilling pool can be used for dissipating energy, the conventional scoop-type stilling pool has more rectangular structures, and if the river valley is narrow, the excavation work amount of the stilling pool is increased, and the construction difficulty is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a flood discharge dissipation structure for narrow river valley, dark tail water, super large single wide flow curve gravity dam is provided, have advantages such as the flood discharge is big, the energy dissipation is effectual, the engineering volume is little and construction convenience.
The utility model adopts the technical proposal that: a flood discharge and energy dissipation structure for a curved gravity dam with narrow river valley, deep tail water and ultra-large single wide flow is characterized in that an overflow dam section of the curved gravity dam is composed of a curved overflow dam and a partition pier erected at the top of the curved overflow dam to form a flow meter hole meeting the discharge requirement, a fan-shaped scoop type energy dissipation pool is connected behind the curved overflow dam, and an energy dissipation tail sill is in an arc form and is concentric with the axis of the dam.
And a flaring pier is additionally arranged at the tail position of the overflow surface hole partition pier.
The fan-shaped scoop type absorption basin is composed of a straight section and a slope section.
The shape of the flaring pier is T-shaped, Y-shaped or X-shaped, and the two-dimensional water flow in the scoop pool can be changed into stable and complete three-dimensional scoop jump.
The utility model has the advantages that: the absorption basin adopts fan-shaped structure to arrange, the excavation engineering volume in low reaches absorption basin has reduced greatly, the straight section of absorption basin adds the slope section, the effectual scoop tank volume that has increased has satisfied the energy dissipation requirement, the curve gravity dam can be better alleviate the flood discharge pressure on upper reaches, combine the wide tail mound to make the horizontal shrink of water tongue, the characteristics of vertically pulling open, it is abundant to dissipate energy in fan-shaped scoop type absorption basin, the effectual narrow valley of having solved, deep tail water, the flood discharge energy dissipation problem of the hydraulic and hydroelectric engineering of super large single wide flow. The structure has the advantages of small engineering quantity, good energy dissipation effect, economy, effectiveness, convenient construction and high reliability.
Drawings
Figure 1 is the plane layout of the flood discharge energy dissipation structure of the utility model discloses narrow river valley, deep tailwater, super large single wide flow curve gravity dam.
Fig. 2 is the section of the flood discharge energy dissipation structure of the narrow river valley, the deep tail water and the super large single wide flow curve gravity dam of the utility model is arranged.
Detailed Description
The invention will be described in further detail with reference to the following drawings and embodiments:
As shown in fig. 1 and 2, the utility model discloses a narrow river valley, deep tailwater, super large single wide flow curve gravity dam's flood discharge dissipation structure, the overflow dam section of curved shape gravity dam 1 comprises the partition mound that curved shape overflow weir 2 and its weir crest erect, forms the table hole that overflows that satisfies the discharge requirement, connects fan-shaped scoop type absorption basin 3 behind the curved shape overflow weir 2, and absorption tail bank 4 is the arc form, is concentric circle with the dam axis.
Preferably, a flaring pier 5 is additionally arranged at the tail position of the overflow surface hole separation pier.
The fan-shaped scoop type absorption basin 3 consists of a straight section and a slope section.
The shape of the flaring pier 5 is T-shaped, Y-shaped or X-shaped, and the two-dimensional water flow in the scoop pool can be changed into stable and complete three-dimensional scoop jump.
the utility model discloses, the gravity dam is the curve type, can be better alleviate upper reaches flood discharge pressure, reduce low reaches excavation engineering volume to can satisfy the flood discharge requirement. The fan-shaped scoop type absorption basin consists of a straight section and a slope section, can effectively increase the volume of the scoop basin, enhance the rolling of the interior of water flow, intensify the energy dissipation of the water flow and improve the energy dissipation effect. The scoop type absorption basin is arranged in a fan-shaped structure, the width of a downstream absorption basin is greatly reduced, the excavation engineering quantity is reduced, and simultaneously, the requirements of downstream flood discharge and energy dissipation can be met, multiple contraction jet flows generated by a flaring pier are utilized to flatten, intersect and mix water tongues discharged along a dam surface in the reverse arc section of the scoop to greatly enhance the turbulent shearing and mixing action in water flow, so that more water flow energy in the scoop passing through the scoop basin is consumed, a binary scoop is converted into a stable and complete ternary scoop, the energy dissipation effect of the water flow in the scoop basin is greatly improved, the water flow of the scoop is stable, the flow speed is greatly reduced, the height of surge after a tail sill is greatly reduced, the connection between the inner water surface and the outer water surface of the scoop basin is relatively stable, and the scouring range and the scouring depth of the downstream are relatively reduced.
The above-mentioned embodiments are only used for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, the scope of the present invention should not be limited by the embodiment, that is, all equivalent changes or modifications made by the spirit of the present invention should still fall within the scope of the present invention.
Claims (4)
1. A flood discharge and energy dissipation structure of a curve gravity dam with narrow river valley, deep tail water and super large single wide flow is characterized in that an overflow dam section of a curve gravity dam (1) is composed of a curve overflow dam (2) and a partition pier erected at the top of the curve overflow dam to form a flow meter hole meeting the discharge requirement, a fan-shaped scoop type energy dissipation pool (3) is connected behind the curve overflow dam (2), and an energy dissipation tail sill (4) is in an arc form and is concentric with the dam axis.
2. The flood discharge and energy dissipation structure of the narrow river valley, the deep tailwater and the ultra-large single wide flow curve gravity dam as claimed in claim 1, wherein a wide tail pier (5) is additionally arranged at the tail position of the overflow surface hole partition pier.
3. The flood discharge and energy dissipation structure of narrow river valley, deep tailwater and super large single wide flow curve gravity dam as claimed in claim 1, wherein said fan-shaped scoop-type stilling pool (3) is composed of straight section and slope section.
4. The narrow river valley, deep tailwater, oversized single wide flow curve gravity dam flood-discharging energy-dissipating structure of claim 2, characterized in that said flaring pier (5) is T-shaped, Y-shaped or X-shaped, all of which can change the two-dimensional water flow in the scoop pool into a stable, complete three-dimensional scoop jump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920369420.5U CN209779578U (en) | 2019-03-21 | 2019-03-21 | Flood discharge and energy dissipation structure of gravity dam with narrow river valley, deep tail water and super-large single-wide flow curve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920369420.5U CN209779578U (en) | 2019-03-21 | 2019-03-21 | Flood discharge and energy dissipation structure of gravity dam with narrow river valley, deep tail water and super-large single-wide flow curve |
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| CN209779578U true CN209779578U (en) | 2019-12-13 |
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| CN201920369420.5U Active CN209779578U (en) | 2019-03-21 | 2019-03-21 | Flood discharge and energy dissipation structure of gravity dam with narrow river valley, deep tail water and super-large single-wide flow curve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778802A (en) * | 2019-03-21 | 2019-05-21 | 中水北方勘测设计研究有限责任公司 | Narrow Valleys, deep tail water, super large discharge per unit width curve gravity dam flood-discharge energy-dissipating structure |
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2019
- 2019-03-21 CN CN201920369420.5U patent/CN209779578U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778802A (en) * | 2019-03-21 | 2019-05-21 | 中水北方勘测设计研究有限责任公司 | Narrow Valleys, deep tail water, super large discharge per unit width curve gravity dam flood-discharge energy-dissipating structure |
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