CN217781916U - Overflow gravity dam structure - Google Patents
Overflow gravity dam structure Download PDFInfo
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- CN217781916U CN217781916U CN202221109817.9U CN202221109817U CN217781916U CN 217781916 U CN217781916 U CN 217781916U CN 202221109817 U CN202221109817 U CN 202221109817U CN 217781916 U CN217781916 U CN 217781916U
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- weir
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- 230000005484 gravity Effects 0.000 title claims abstract description 39
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 230000003628 erosive effect Effects 0.000 abstract description 5
- 230000001154 acute effect Effects 0.000 abstract description 4
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 4
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009991 scouring Methods 0.000 description 1
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Abstract
The utility model provides an overflow gravity dam structure, which comprises a gravity dam and a labyrinth weir; the labyrinth weir is arranged on the top surface of the gravity dam; the labyrinth weir is arranged on the top surface of the gravity dam; the labyrinth weir comprises an upstream curved wall and a downstream curved wall; the upstream curved walls and the downstream arc walls are connected in a staggered manner to form a wavy labyrinth weir; the upstream curved wall comprises a lower curved wall obliquely arranged upstream and an upper arc-shaped wall vertically arranged; because the lower curved wall is obliquely arranged upstream, the upstream water flow is upwards lifted, the water flow-through flow is effectively increased, and the water flow velocity is reduced, so that the aim of eliminating partial flow is fulfilled; and the upper arc-shaped wall is vertically arranged, so that the overflow weir crest is prevented from forming an acute angle to generate cavitation erosion.
Description
Technical Field
The utility model belongs to the technical field of hydraulic and hydroelectric engineering, concretely relates to overflow gravity dam structure for mountain area canyon area.
Background
At present, in the domestic medium and small-sized reservoir capacity expansion transformation, the problems of reducing an overflow head and increasing flood discharge amount under the condition of raising the elevation of a weir crest generally exist; in addition, in some mountainous canyon regions, there are difficulties in that the width is limited by the terrain, and the labyrinth weir can solve the problems well. However, the currently used labyrinth weirs mainly include a rectangular labyrinth weir, a triangular labyrinth weir and a trapezoidal labyrinth weir, and under the condition that the overflow head is not changed, the three labyrinth weirs have larger overflow front width than a linear weir, so that the flow discharge capacity is greatly increased, but the flow discharge capacity cannot meet the requirements.
In addition, in order to avoid the overflow weir crest to form an acute angle and produce cavitation, the upstream weir wall of the existing labyrinth weir is vertically arranged, but the vertically arranged upstream weir wall is not favorable for weir flow energy dissipation, and the flow state of water flow behind the weir is relieved.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art's shortcoming, the utility model aims to provide an overflow gravity dam structure, it adopts wavy maze weir, further increases overflow forward position width, improves the earial drainage ability in order to satisfy the earial drainage requirement, simultaneously, with the upper reaches wall replacement that traditional vertical arranged for the curved wall of lower part and the vertical upper portion arc wall of arranging of inclining upstream, when avoiding cavitation erosion to produce, increase the flow of upper reaches rivers, reduce the velocity of water flow, reach the purpose of eliminating partial energy.
To achieve the above and other related objects, the present invention provides an overflow gravity dam structure, including a gravity dam and a labyrinth weir; the labyrinth weir is arranged on the top surface of the gravity dam; the labyrinth weir comprises an upstream curved wall and a downstream curved wall; the upstream curved walls and the downstream arc walls are connected in a staggered manner to form a wavy labyrinth weir; the upstream curved wall comprises a lower curved wall obliquely arranged upstream and an upper arc-shaped wall vertically arranged; because the lower curved wall is obliquely arranged upstream, the water flow-through flow is effectively increased, and the flow velocity of water flow is reduced, so that the aim of eliminating partial flow is fulfilled; and the upper arc-shaped wall is vertically arranged, so that the overflow weir crest is prevented from forming an acute angle to generate cavitation erosion.
Preferably, the lower curved wall is formed by splicing a plurality of inclined plates, so that the spliced lower curved wall 211 can be in perfect transition connection with the downstream arc-shaped wall 22.
Preferably, the downstream curved wall is arranged vertically.
Preferably, both ends of the labyrinth weir are provided with end walls connected with the water retaining dam, and the end walls are vertically arranged flat plate walls so as to increase the connection area of the labyrinth weir and the water retaining dam and ensure the connection strength.
Preferably, the back surface of the gravity dam is a first step surface to dissipate energy of water flow discharged from the labyrinth weir, and avoid great scouring of a downstream riverbed.
Preferably, the top surface of the gravity dam is a second step surface to further dissipate energy of the discharged water flow.
Preferably, the gravity dam is provided with a first gallery and a second gallery for cable, traffic and drainage grouting.
Preferably, a traffic bridge is arranged on the top of the labyrinth weir, so that pedestrians and vehicles can conveniently pass through the traffic bridge.
As above, the utility model discloses an overflow gravity dam structure has following beneficial effect:
(1) The upstream curved walls and the downstream curved walls are alternately connected to form a wavy labyrinth weir, so that the width of the front edge of overflow is increased, the flow discharge capacity is improved, and the attractiveness is improved;
(2) The original vertically arranged upstream wall is replaced by the lower curved wall and the vertically arranged upper arc-shaped wall which are obliquely arranged upstream, so that the cavitation erosion is avoided, the flow of water flow is increased, the flow velocity of the water flow is reduced, and the purpose of eliminating partial energy is achieved;
(3) The top surface and the back surface of the gravity dam are both set to be stepped surfaces, and the downward discharged water flow is effectively energy-dissipated.
Drawings
Fig. 1 is a side view of the structure of the overflow gravity dam of the present invention.
Fig. 2 is a top view of the structure of the overflow gravity dam of the present invention.
Description of the reference numerals
The gravity dam comprises a gravity dam 1, a first step surface 11, a second step surface 12, a first gallery 13, a second gallery 14, a labyrinth weir 2, an upstream curved wall 21, a lower curved wall 211, an upper arc-shaped wall 212, a downstream arc-shaped wall 22, an end wall 24, a traffic bridge 3 and a traffic bridge foundation 31.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1-2. It should be understood that the structure, proportion, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions of the present invention, so that the present invention does not have the substantial technical significance, and the modification of any structure, the change of the proportion relation or the adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description only, and are not used to limit the scope of the present invention, and the relative relationship between the terms may be changed or adjusted without substantial technical changes.
As shown in fig. 1 to 2, the present invention provides an overflow gravity dam structure, which comprises a gravity dam 1 and a labyrinth weir 2; the labyrinth weir 2 is arranged on the top surface of the gravity dam 1; the labyrinth weir 2 comprises an upstream curved wall 21 and a downstream curved wall 22; the upstream curved wall 21 and the downstream curved wall 22 are connected in a staggered manner to form a wavy labyrinth weir 2; the upstream curved wall 21 includes a lower curved wall 211 disposed obliquely upstream and an upper curved wall 212 disposed vertically.
The lower curved wall 211 which is obliquely arranged upstream enables the upstream water flow to be lifted upwards, the flow path is increased, the flow speed of the water flow is reduced, and therefore the impact force of the water flow is reduced (namely energy dissipation is achieved); and the vertically arranged upper arc-shaped wall 212 effectively avoids the overflow weir crest from forming an acute angle to generate cavitation erosion.
As shown in fig. 1, the downstream curved wall 22 is arranged vertically.
It will be appreciated that the lower curved wall 211 is formed by splicing a plurality of sloping panels, each sloping panel being arranged obliquely upstream to ensure a perfect transition between the spliced lower curved wall 211 and the downstream curved wall 22.
It is understood that the radii of the upper curved wall 212 and the downstream curved wall 22 may be set according to practical circumstances, and are not limited thereto, as long as the hydraulic characteristics are satisfied.
Further, as shown in fig. 2, end walls 24 connected with the water retaining dam are arranged at two ends of the labyrinth weir 1, and the end walls 24 are flat plates vertically arranged, so that the connection area of the labyrinth weir 1 and the water retaining dam is increased, and the connection strength is ensured.
As shown in fig. 1 and 2, the back surface of the gravity dam 1 is a first step surface 11 to achieve an energy dissipation effect.
As shown in fig. 1 and 2, the top surface of the gravity dam 1 is a second step surface 12 to achieve energy dissipation effect.
It will be appreciated that the second step surface 12 cooperates with the first step surface 11 to form a continuous step surface.
As shown in fig. 1, a first gallery 13 and a second gallery 14 are provided on the gravity dam 1 for cable, traffic and water drainage grouting.
As shown in fig. 1, a traffic bridge 3 is arranged on the top of the labyrinth weir 2 to facilitate the passage of pedestrians and vehicles.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. An overflow gravity dam structure comprises a gravity dam (1) and a labyrinth weir (2); the labyrinth weir (2) is arranged on the top surface of the gravity dam (1); characterized in that said labyrinth weir (2) comprises an upstream curved wall (21) and a downstream curved wall (22); the upstream curved wall (21) and the downstream arc-shaped wall (22) are connected in a staggered manner to form a wavy labyrinth weir (2); the upstream curved wall (21) includes a lower curved wall (211) arranged obliquely upstream and an upper curved wall (212) arranged vertically.
2. An overflow gravity dam structure as claimed in claim 1 wherein said lower curved wall (211) is formed by splicing a plurality of sloping panels.
3. An overflow gravity dam structure according to claim 2 wherein said downstream curved wall (22) is vertically disposed.
4. An overflow gravity dam structure according to claim 1 wherein both ends of said labyrinth weir (2) are provided with end walls (24) connected to the dam, said end walls (24) being vertically disposed flat plate walls.
5. An overflow gravity dam structure according to any of claims 1-4 wherein the back surface of the gravity dam (1) is the first step surface (11).
6. An overflow gravity dam structure according to claim 5, characterized in that the top surface of the gravity dam (1) is a second step surface (12).
7. An overflow gravity dam structure according to any of claims 1 to 4 wherein the gravity dam (1) is provided with a first gallery (13) and a second gallery (14).
8. An overflow gravity dam structure according to any of claims 1-4 characterized in that a traffic bridge (3) is arranged on top of said labyrinth weir (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221109817.9U CN217781916U (en) | 2022-05-10 | 2022-05-10 | Overflow gravity dam structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221109817.9U CN217781916U (en) | 2022-05-10 | 2022-05-10 | Overflow gravity dam structure |
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| Publication Number | Publication Date |
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| CN217781916U true CN217781916U (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221109817.9U Active CN217781916U (en) | 2022-05-10 | 2022-05-10 | Overflow gravity dam structure |
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| CN (1) | CN217781916U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116971338A (en) * | 2023-07-31 | 2023-10-31 | 中交一公局第七工程有限公司 | Methods for rapid construction of rock-fill self-compacting concrete gravity dams |
| CN117166423A (en) * | 2023-09-11 | 2023-12-05 | 合肥中盛水务发展有限公司 | An arc-shaped water inlet weir |
-
2022
- 2022-05-10 CN CN202221109817.9U patent/CN217781916U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116971338A (en) * | 2023-07-31 | 2023-10-31 | 中交一公局第七工程有限公司 | Methods for rapid construction of rock-fill self-compacting concrete gravity dams |
| CN117166423A (en) * | 2023-09-11 | 2023-12-05 | 合肥中盛水务发展有限公司 | An arc-shaped water inlet weir |
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