CN204982814U - Power that disappears structure in low water head dam low reaches riverbed - Google Patents
Power that disappears structure in low water head dam low reaches riverbed Download PDFInfo
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- CN204982814U CN204982814U CN201520585113.2U CN201520585113U CN204982814U CN 204982814 U CN204982814 U CN 204982814U CN 201520585113 U CN201520585113 U CN 201520585113U CN 204982814 U CN204982814 U CN 204982814U
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Abstract
The utility model discloses a power that disappears structure in low water head dam low reaches riverbed, including trapezoid table body baffle pier and concrete foundation. The power that disappears structure is located absorption basin or protects 12-13 smooth departments, multirow setting or staggered arrangement. Utilize rivers to the impact force of block of wood, force the rivers bounce -back to form the hydraulic jump, consume a large amount of energy to change the dump energy of rivers into potential energy by kinetic energy. Many secondary shock of rivers baffle pier, hydraulic jump will tend towards stability and the potential energy reduces to make the tail water ground roll move gently, reach and eliminating the purpose of complementary energy than the short distance, thereby it washes away destruction to low reaches water conservancy project facility and riverbed, bank are sloping to reduce rivers. The accessible is to high, the distribution and the influence of quantity to rivers of multiple factor analysis baffle piers such as rivers flow state, hydraulic jump characteristic, water surface curve distribution in actual application to reach the optimum power efficiency that disappears.
Description
Technical field
The utility model belongs to Hydraulic and Hydro-Power Engineering flood-discharge energy-dissipating supporting facility field, especially a kind of baffle structure of low water head dam underwater bed.
Background technology
Low water head hydraulic architecture is generally positioned at middle and lower reaches basin, river, area that physical features is comparatively mild, and on the sandy gravel basis mostly building deep covering layer in, features as poor geologic condition, often can not cause enough attention.Due to Geological Reasons, riverbed erosion resistibility is poor, and Dissipation of Energy can not be solved very well, and lower sluicing stream has larger kinetic energy, more exacerbates the turbulent fluctuation of downstream current, and usually cause riverbed to rush and wash in a pan into hole, bank slope destroys by rush of water.Engineering is built up and is run after several years, under dam the position such as protection-apron, apron and erosion control facility also time have damaged or destroyed by flood phenomenon to occur, bring potential safety hazard to engineering, while damaged or destroyed by flood reparation also can increase investment, affect the normal performance of project benefit.
The basic characteristics of this type of hydraulic engineering are: 1) catchment area of reservoir mighty torrent amount in comparatively large, flood season is large; 2) head is lower, level of tail water fluctuation is larger; 3) in multi-purpose project, sluice had both been water retaining structure, was again outlet structure escape works; 4) foundation plane is generally on the deep covering layer based on sandy gravel; 5) riverbed erosion resistibility is poor; 6) sluice hole number is many, does not establish absorption basin or directly substitute with protection-apron behind some hydraulic engineering dams.
At present, in engineering, the normal Energy Dissipation Modes adopted has: the energy dissipating of surface current formula, choose streaming energy dissipating and underflow energy dissipation etc.
(1) surface current formula energy dissipating small investment, easy removal of impurities scrubbing, but its streams is complicated, and wayward, downstream wave is large, affect hydraulic turbine operation, shipping and two sides facility stable, and application conditions is comparatively harsh.
(2) choose streaming energy dissipating cost low, effect of energy dissipation is good, but chooses stream interface and will bear washing away of high-velocity flow, and wearing and tearing are very large, and this has just had higher quality and technical requirements to choosing stream interface; In addition, choose streaming energy dissipating due to the diffusion as far as possible of current and wide range, make aerial atomization of water current degree comparatively large, also serious to the impact in riverbed, therefore need the impact resistance strengthening underwater bed.
(3) underflow energy dissipation also claims energy dissipation by hydraulic jump, utilizes hydraulic jump to carry out flowing state transition, consumed energy.By violent turbulent fluctuation effect, the part kinetic transformation making current is potential energy and heat energy, thus reaches the object of energy dissipating.This Energy Dissipation Modes downstream water ground roll Dynamic stability, safe and reliable, tail water luffing strong adaptability, without atomizating phenomenon, but under the effect of high-velocity flow, easily there is cavitation corrosion in the supporting facility in underflow stilling pool, causes rushing washing in a pan destroying; Its power facilities engineering amount that disappears is large, and construction costs is higher.
Disspation through hydraudic jimp mode is the Hydraulic and Hydro-Power Engineering applying to low water head generally more, obtained in each large, medium and small hydraulic architecture in recent years and used comparatively widely, but there is a general knowledge question of water conservancy in low water head Hydraulic and Hydro-Power Engineering, low in low Buddhist formula number (when Fr is less than 4.5, energy dissipation rate is generally 20% ~ 45%) the Water Under energy dissipation rate that jumps exactly.Therefore for middle-size and small-size Hydraulic and Hydro-Power Engineering, under raising Low Froude numbers, the energy dissipation rate of hydraulic jump, solves the downstream dissipator of energy erosion control problem of low water head outlet structure escape works, the erosion control facility of efficient energy dissipating can be taked to be very necessary with suiting measures to local conditions.
Adopt the dam of disspation through hydraudic jimp mode for current middle-size and small-size Hydraulic and Hydro-Power Engineering, underwater bed commonly uses energy dissipating measure to be had:
(1) multistage absorption basin is set up.The absorption basin of more than two-stage or two-stage is set in outlet structure escape works downstream exactly, by falling of repeatedly hydraulic jump, consumes water energy step by step, thus reduce high-velocity flow washing away of underwater bed is washed in a pan with punching.The shortcoming of this measure: because single-stage afterbay energy dissipating efficiency is poor, afterbay is longer again step by step, so its earthwork evacuation amount is large, concreting amount is large, construction costs is high.
(2) auxiliary energy-dissipating installation is increased.On afterbay or protection-apron, add various auxiliary energy-dissipating installation exactly, change flow shape, improve energy dissipation by hydraulic jump rate.This measure disappears power effect better, and can reduce absorption basin or protection-apron size, engineering is dropped into more economical, more reliable.
Baffle pier is that conventional one assists energy-dissipating installation, and common pier body structure pattern has: cuboid, right-angled trapezium body, Rhizoma Sparganii cone, T-shaped baffle pier etc.This type of baffle pier, in practice, although also there is the power effect that well disappears, under the effect of high-velocity flow, especially sand content larger under let out flow action under, larger destruction is had to the steadiness of pier body, impact-resisting wear-resisting and durability.
Utility model content
The purpose of this utility model is exactly the situation for above-mentioned prior art, propose a kind of baffle structure of low water head dam underwater bed, overcome the energy dissipating of surface current formula and the drawback of choosing streaming energy dissipating, improve the energy dissipation rate of Hydraulic and Hydro-Power Engineering underflow energy dissipation better, high-velocity flow is to the washing away of sluicing supporting facility, cavitation erosion under low Fr current condition to solve low water head hydraulic architecture, and current are washed in a pan and the destruction of river bank scouring rushing of riverbed.
The purpose of this utility model is achieved through the following technical solutions: a kind of baffle structure of low water head dam underwater bed, comprise concrete pedestal and N number of baffle pier, described baffle pier is trapezoidal stage body, and slope, stage body inclined-plane is than being 1:1, described baffle pier is fixed on concrete pedestal, N≤5.
Further, described baffle pier pier high is the depth of water before 0.8 ~ 1.0 times of hydraulic jump, and pier is wide is that 0.4 ~ 0.6 times of pier is high.
Further, described baffle pier is fixed on 1/2 ~ 1/3 place of absorption basin (or protection-apron), and many rows arrange or are staggered.
The beneficial effects of the utility model are: the bucking ladder body structure of this baffle pier, and the pedestal anchoring area of unit volume is comparatively large, and steadiness is good; Inclined-plane, stage body four directions, reflexion and scour flow energy dissipating is more abundant; Baffle pier abrasion resistant effect against corrosion is obvious, and durability is also better.Due to the multi-row staggered layout of baffle pier energy, add hydraulic jump, improve energy dissipation rate, improve downstream water-flow equation, in practice, shorten absorption basin length, saved construction costs to a certain extent.
Accompanying drawing explanation
Fig. 1 is the elevation of the baffle structure of a kind of low water head dam of the utility model underwater bed;
Fig. 2 is the top view of the baffle structure embodiment of a kind of low water head dam of the utility model underwater bed;
Fig. 3 is the positive view of the baffle structure embodiment of a kind of low water head dam of the utility model underwater bed.
Description of reference numerals: 1-concrete pedestal; 2-baffle pier; A B-reflexion and scour flow.
Detailed description of the invention
Be described further below in conjunction with the baffle structure of accompanying drawing to a kind of low water head of the utility model dam underwater bed: this embodiment is only not used in restriction scope of the present utility model for illustration of the utility model, the amendment of those skilled in the art to the various equivalent form of value of the present utility model all falls within the application's claims limited range.
As shown in Figure 1, the baffle structure of a kind of low water head dam underwater bed described in the utility model, comprise concrete pedestal 1 and N number of baffle pier 2, baffle pier 2 is trapezoidal stage body, is fixed on concrete pedestal 1, N≤5; Slope, baffle pier 2 stage body inclined-plane is than being 1:1, and pier is high is the depth of water before 0.8 ~ 1.0 times of hydraulic jump, and pier is wide is that 0.4 ~ 0.6 times of pier is high, can be pier high 0.5 times with row's pier spacing.
Baffle structure is arranged in 1/2 ~ 1/3 place of absorption basin (or protection-apron), and general many rows arrange or are staggered.
As shown in Figure 1, reflexion and scour flow A and reflexion and scour flow B met by baffle pier 2 pier spacing after energy reduce;
In the embodiment depicted in figure 2, two row's baffle piers are staggeredly arranged in parallel, and reflexion and scour flow A washes away the right baffle pier 2 left surface, and water flow dynamic energy changes with direction; Reflexion and scour flow B washes away left side baffle pier 2 right flank, and water flow dynamic energy changes with direction; After two groups of reflexions and scour flows meet, energy successively decreases again.Fig. 2 current are divided into many shallow bid current in the plane, make it intersect after baffle pier, mutually clash into and produce eddy flow; What current were subject on the vertical plane blocks, and is formed and forces hydraulic jump, produce the friction between vertical eddy flow and current before and after pier, and abatement water flow dynamic energy is assisted and improved hydraulic jump usefulness; Also the lateral dispersion of current, turbulent fluctuation shearing and air entrainment (increasing the turbulent fluctuation face of current and the contact surface of air, the air entrainment of current and current) can be strengthened, thus control hydraulic jump, improve the power flow-shape that disappears, the impact force of current in unit area is reduced greatly.
Claims (3)
1. the baffle structure of a low water head dam underwater bed, comprise concrete pedestal (1) and N number of baffle pier (2), it is characterized in that, described baffle pier (2) is trapezoidal stage body, slope, stage body inclined-plane is than being 1:1, described baffle pier (2) is fixed on concrete pedestal (1), N≤5.
2. the baffle structure of a kind of low water head dam underwater bed according to claim 1, is characterized in that, described baffle pier (2) pier high is the depth of water before 0.8 ~ 1.0 times of hydraulic jump, and pier is wide is that 0.4 ~ 0.6 times of pier is high.
3. the baffle structure of a kind of low water head dam underwater bed according to claim 1, is characterized in that, described baffle pier (2) is fixed on 1/2 ~ 1/3 place of absorption basin or protection-apron, and many rows arrange or are staggered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520585113.2U CN204982814U (en) | 2015-08-06 | 2015-08-06 | Power that disappears structure in low water head dam low reaches riverbed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520585113.2U CN204982814U (en) | 2015-08-06 | 2015-08-06 | Power that disappears structure in low water head dam low reaches riverbed |
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| Publication Number | Publication Date |
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| CN204982814U true CN204982814U (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520585113.2U Expired - Fee Related CN204982814U (en) | 2015-08-06 | 2015-08-06 | Power that disappears structure in low water head dam low reaches riverbed |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107090809A (en) * | 2017-04-14 | 2017-08-25 | 广东省水利水电科学研究院 | A kind of low water head Downstream of Sluice stiling basin method of construction |
| CN112897633A (en) * | 2019-12-03 | 2021-06-04 | 鞠金陶 | Vertical ultraviolet disinfection device |
| CN113235528A (en) * | 2021-04-24 | 2021-08-10 | 四川大学 | Flexible artificial structure body for river protection and application method |
| CN113737747A (en) * | 2021-09-18 | 2021-12-03 | 内蒙古引绰济辽供水有限责任公司 | Reservoir earth and rockfill dam upper reaches bank protection structure of breaking wave |
-
2015
- 2015-08-06 CN CN201520585113.2U patent/CN204982814U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107090809A (en) * | 2017-04-14 | 2017-08-25 | 广东省水利水电科学研究院 | A kind of low water head Downstream of Sluice stiling basin method of construction |
| CN107090809B (en) * | 2017-04-14 | 2019-06-18 | 广东省水利水电科学研究院 | A kind of low water head Downstream of Sluice stilling pond method of construction |
| CN112897633A (en) * | 2019-12-03 | 2021-06-04 | 鞠金陶 | Vertical ultraviolet disinfection device |
| CN113235528A (en) * | 2021-04-24 | 2021-08-10 | 四川大学 | Flexible artificial structure body for river protection and application method |
| CN113737747A (en) * | 2021-09-18 | 2021-12-03 | 内蒙古引绰济辽供水有限责任公司 | Reservoir earth and rockfill dam upper reaches bank protection structure of breaking wave |
| CN113737747B (en) * | 2021-09-18 | 2023-01-31 | 内蒙古引绰济辽供水有限责任公司 | Reservoir earth and rockfill dam upper reaches bank protection structure of breaking wave |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20160806 |
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| CF01 | Termination of patent right due to non-payment of annual fee |