CN211256913U - Curve overflow weir structure of bank spillway - Google Patents
Curve overflow weir structure of bank spillway Download PDFInfo
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- CN211256913U CN211256913U CN201921476736.0U CN201921476736U CN211256913U CN 211256913 U CN211256913 U CN 211256913U CN 201921476736 U CN201921476736 U CN 201921476736U CN 211256913 U CN211256913 U CN 211256913U
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Abstract
The utility model discloses a bank spillway's curve overflow weir structure, including the overflow weir, close on the bank and extend the outside that sets up according to the topography and lead the wall and be close to the inboard of riverbed and lead the wall, the overflow weir axis adopts asymmetric curve, and the inboard is led the wall and is adopted the pitch arc to arrange, arranges overflow weir body to riverbed one side skew, increases overflow weir body overflow forward position length, and flood during flood discharge is through the smooth-going entering chute of overflow weir. The weir body is deviated to one side of the riverbed, the discharge front edge of the weir body is longer than that of the traditional straight line weir, the designed discharge can be guaranteed, the problems of transverse flow and circulation caused by the side weir can be avoided, and the increase of the engineering quantity caused by the scale increase of the spillway is avoided. The utility model discloses simplify the structural style of overflow weir, reduce its construction degree of difficulty, reduced engineering volume and engineering investment, obtained good social and economic benefits.
Description
Technical Field
The utility model relates to a flood discharge facility among the hydraulic and hydroelectric engineering, especially a curve overflow weir structure of bank spillway.
Background
A shoreside spillway in hydraulic and hydroelectric engineering comprises an overflow weir, a discharge groove and an energy dissipation facility. Overflow weirs typically take the form of utility weirs, wide top weirs and hump weirs. The arrangement type of the shoreside spillway usually adopts a normal trough type and a side trough type. The discharge groove axis of the positive groove type spillway is orthogonal to the overflow weir axis, and the weir passing water flow direction is parallel to the discharge groove axis; the water flow of the side-channel spillway crossing the weir is nearly vertical to the axis of the discharge channel. The flow coefficient of the positive weir is slightly larger, and the water flow condition behind the weir is better; the phenomenon of circulation and streaming is easy to occur behind the side weir, especially for the conditions of low weir and low water head; the combination of the positive weir and the side weir is adopted, the stress at the junction of the weir body is concentrated, the structure of the weir body is complex, and the flow state behind the weir is disordered. The curve overflow weir can be well adapted to terrain and geological conditions, the flow discharge capacity is increased under the condition that the scale of a spillway is not increased, and the flow state of water flow behind the weir is relieved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a curve overflow weir structure of bank spillway is provided, to the restricted water conservancy pivot of earial drainage forward position, can guarantee the ability of overflowing, the adjustment flow state, economical and practical.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a bank spillway's curve overflow weir structure, includes the overflow weir, closes on the bank and extends the outside guide wall that sets up and the inboard guide wall that is close to the riverbed according to the topography, the overflow weir axis adopts asymmetric curve, and the inboard guide wall adopts the pitch arc to arrange, arranges the overflow weir body to riverbed one side skew, increases overflow weir body overflow forward position length, and flood during flood discharge is through the smooth entering chute of overflow weir.
The overflow weir is a practical weir, a wide top weir or a hump weir.
The axial line of the overflow weir is an asymmetric curve and adopts an arc shape, a parabola shape or an ellipse shape.
The included angle alpha between the axis of the discharge groove and the central line of the overflow weir is between 15 and 45 degrees.
The inner side guide wall is arc-shaped, the arc circle center of the inner side guide wall is on the extension line of the curve circle center of the overflow weir, and the upstream extension section L of the inner side guide wall is 1-2 times of weir height.
The utility model has the advantages that: under the condition of not increasing the width of the spillway, the overflow weir is arranged by adopting an asymmetric curve, the arrangement form of the overflow weir is optimized according to local conditions, only the axis direction and the front edge length of the overflow weir are changed, the discharge capacity of the overflow weir is effectively increased, and the flow state is stably transited behind the weir, so that the designed flow of the underflow can be ensured, the problems of transverse flow and circulation caused by a side weir are avoided, the structural form of the overflow weir is simplified, the construction difficulty is reduced, the engineering quantity is reduced, and the engineering investment is reduced.
Drawings
Fig. 1 is a schematic plan view of the curved overflow weir structure of the bank spillway of the present invention.
Fig. 2 is a schematic view of a cross section a-a of the curved overflow weir structure of the bank spillway of the present invention.
In the figure: 1-an overflow weir; 2-outer guide wall; 3-inner side guide wall; 4, draining the groove; 5-chute axis; 6-center line of overflow weir; l is the extension length of the inner side guide wall; alpha is the included angle between the central line of the overflow weir and the axis of the discharge chute.
Detailed Description
The invention will be described in further detail with reference to the following drawings and embodiments:
as shown in fig. 1-2, the utility model discloses a bank spillway's curve overflow weir structure, including overflow weir 1, close on the bank and extend the outside that sets up according to the topography and lead wall 2 and the inboard that is close to the riverbed and lead wall 3, the asymmetric curve is adopted to overflow weir 1 axis, and inboard leading wall 3 adopts the pitch arc to arrange, arranges the overflow weir body to riverbed one side skew, increases overflow weir body overflow forward position length, and flood during the flood discharge is through the smooth-going chute 4 that gets into of overflow weir 1.
The overflow weir 1 is a practical weir, a wide top weir or a hump weir.
The axial line of the overflow weir is an asymmetric curve and adopts an arc shape, a parabola shape or an ellipse shape.
The included angle alpha between the axis 5 of the discharge groove and the central line 6 of the overflow weir is between 15 and 45 degrees.
The inner side guide wall 3 is arc-shaped, the arc circle center of the inner side guide wall is on the extension line of the curve circle center of the overflow weir, and the upstream extension section L of the inner side guide wall 3 is 1-2 times of weir height.
In a small reservoir pivot project, a dam is a homogeneous earth dam, the maximum dam height is 39m, an open type single-hole spillway is adopted for flood discharge, the weir water head is 3.4m, and the check flood discharge capacity is 201m3(s) design flood discharge rate of 91m3And s. The spillway is limited by the terrain, the width arrangement is limited, and the left side slope is high and steep. Adopt positive weir to arrange because the weir height is lower, and the flood peak is poor, and flow coefficient is less, if satisfy design discharge flow down, will increase spillway width, cause the increase of spillway excavation volume, the side slope increases, the engineering investment increase. If the side weir arrangement is adopted, the designed discharge flow is required to be met, the overflow front edge is excessively increased, the flow state of water flow behind the weir is disordered, and the problem of turbulent flow circulation is easy to occur. The combination of the positive weir and the side weir is adopted, the stress at the joint of the weir body is concentrated, the structure of the weir body is complex, and the flow state of water flow behind the weir is more disordered.
Adopt the utility model discloses an overflow weir. The weir body direct arrangement sets up the low practical weir type that asymmetric curve arranged in the spillway in the reservoir area, can arrange longer overflow weir in the limited width, and the wall adjustment import rivers flow state is led to the right circular arc, and rivers flow state is steady behind the weir when low water level and high water level, finally smooth-going entering chute. The utility model discloses change on engineering structural style and rivers flow regime to some extent, make design engineering economy reasonable, it is pleasing to the eye suitable for.
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 (5)
1. The utility model provides a bank spillway's curve overflow weir structure, including overflow weir (1), close on the bank and extend outside guide wall (2) that set up and inboard guide wall (3) near the riverbed according to the topography, its characterized in that, asymmetric curve is adopted to overflow weir (1) axis, inboard guide wall (3) adopt the pitch arc to arrange, arrange the overflow weir body to riverbed one side skew, increase overflow weir body overflow front length, flood during the flood discharge smoothly gets into let-off groove (4) through overflow weir (1).
2. The curved weir structure of a shoreside spillway according to claim 1, wherein the weir (1) is a utility weir, a wide top weir or a hump weir.
3. The curved weir structure of a shoreside spillway of claim 1, wherein the weir axis is an asymmetric curve, in the form of a circular arc, a parabola or an ellipse.
4. The curved weir structure of a bank spillway according to claim 1, wherein the angle α between the axis (5) of the trough and the weir centre line (6) is between 15 ° and 45 °.
5. The curved overflow weir structure of a bank spillway according to claim 1, wherein the inner guide wall (3) is arc-shaped, the center of the arc of the inner guide wall is on the extension line of the center of the curve of the overflow weir, and the upstream extension L of the inner guide wall (3) is 1-2 times of weir height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921476736.0U CN211256913U (en) | 2019-09-05 | 2019-09-05 | Curve overflow weir structure of bank spillway |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921476736.0U CN211256913U (en) | 2019-09-05 | 2019-09-05 | Curve overflow weir structure of bank spillway |
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| CN211256913U true CN211256913U (en) | 2020-08-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593222A (en) * | 2019-09-05 | 2019-12-20 | 中国电建集团北京勘测设计研究院有限公司 | A curved overflow weir structure for a bank spillway |
| CN112431171A (en) * | 2020-12-03 | 2021-03-02 | 中国电建集团华东勘测设计研究院有限公司 | Underwater throwing-filling type isolation dam and implementation method thereof |
-
2019
- 2019-09-05 CN CN201921476736.0U patent/CN211256913U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593222A (en) * | 2019-09-05 | 2019-12-20 | 中国电建集团北京勘测设计研究院有限公司 | A curved overflow weir structure for a bank spillway |
| CN110593222B (en) * | 2019-09-05 | 2025-04-01 | 中国电建集团北京勘测设计研究院有限公司 | A curved overflow weir structure for bank spillway |
| CN112431171A (en) * | 2020-12-03 | 2021-03-02 | 中国电建集团华东勘测设计研究院有限公司 | Underwater throwing-filling type isolation dam and implementation method thereof |
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