CN1022340C - Energy dissipation structure of soft foundation overflow dam - Google Patents
Energy dissipation structure of soft foundation overflow dam Download PDFInfo
- Publication number
- CN1022340C CN1022340C CN90105175A CN90105175A CN1022340C CN 1022340 C CN1022340 C CN 1022340C CN 90105175 A CN90105175 A CN 90105175A CN 90105175 A CN90105175 A CN 90105175A CN 1022340 C CN1022340 C CN 1022340C
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- CN
- China
- Prior art keywords
- weir
- overflow weir
- energy dissipation
- energy
- bailing bucket
- Prior art date
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- Expired - Fee Related
Links
- 230000021715 photosynthesis, light harvesting Effects 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002262 irrigation Effects 0.000 abstract description 3
- 238000003973 irrigation Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000009991 scouring Methods 0.000 abstract 1
- 241000209094 Oryza Species 0.000 description 5
- 235000007164 Oryza sativa Nutrition 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 235000009566 rice Nutrition 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The invention relates to an energy dissipation structure of hydraulic engineering, which is suitable for energy dissipation on an overflow weir of irrigation engineering. The overflow weir comprises a special curve-shaped weir surface arranged on the overflow weir and a narrow-slit triangular pier arranged in a scoop at the rear part of the overflow weir, and has the advantages of good energy dissipation effect, prolonged service life of the overflow weir, capability of saving the engineering investment by 30-40% and 70% reduction of the downstream scouring depth compared with a general low-flow energy dissipation engineering structure.
Description
The present invention is a kind of energy-dissipating structure of hydraulic engineering, is applicable to the overflow weir of engineering irrigation.
The method that at present domestic and international irrigation channel water is used to irrigate extensively adopts overfall dam, and its dam length is shorter, overflow height of dam 1-3 rice, head 1-2 rice on the dam, inflow-rate of water turbine 2-8 rice
3Adopt bavin stone overfall dam in Losses in Eastern Mountain Area of Liao Ning/second, and nearly 2,000, its construction is simple, gathers materials on the spot.But delivery period, easily destroy by rush of water, and needs often maintenance, and per thousand of annual maintenance costs reach ten thousand yuans of 300-500.In order to change existing bavin masonry dam is the semipermanent engineering, reduces maintenance cost, adopts the stone masonry overfall dam, and dam facing is a unit cambered surface formula, in the use underwater bed is washed away seriously.In order to reduce to the washing away of downstream, adopt the underflow type hydrostatic power wall method that disappears, but the construction investment height, every meter cost 1200-1400 unit; Also have and adopt the board-like overfall dam method of movable gate, construction investment is lower, but shortcoming is hung the silt faggot when being overflow, influence flood discharge, and the downstream scour depth is also bigger.
Task of the present invention is to propose a kind of energy-dissipating structure that is used for soft basic overflow weir, to reduce the washing away of downstream, saves construction investment, and can guarantee weir safety, increases the service life.
The object of the present invention is achieved like this: overflow weir is made up of the bailing bucket at weir face and rear portion, the weir face is made a special surface, can adopt two kinds of patterns: (1) four circular curve type, wherein R1=0.5H, R2=0.2H, R3=0.04H, R4=H, H is a head height on the dam.(2) elliptic curve adds a circular curve type, transverse 0.4H wherein, and minor axis 0.2H, the ratio of major and minor axis is 2, arc radius r=H.Connect an anti-circular arc bailing bucket behind overflow weir, uniform narrow slit triangle pier is advisable with isoceles triangle (overlooking) in the bailing bucket, and high and wide ratio is 2, and stitching wide ratio is 0.8-1.2, pastes mutually with the bailing bucket surface curve at the bottom of the pier.
Advantage of the present invention is:
(1), compares saving construction investment 34% with the disspation through hydraudic jimp engineering;
(2), effect of energy dissipation is good, the downstream scour depth alleviates 70%;
(3), dam body safety, the life-span prolongs.Be applicable on the soft basic gravel riverbed.
Below in conjunction with embodiment and accompanying drawing thereof details of the present invention is further described.
Fig. 1 is an overflow weir energy-dissipating structure general illustration.
Fig. 2 is four circular curve shape schematic diagrames.
Fig. 3 is that elliptic curve adds a circular curve shape schematic diagram.
Fig. 4 is that the triangle pier is arranged schematic diagram.
With reference to the accompanying drawings, H-weir head among the figure, P-weir face height, the ht-downstream water depth, the R-anti-arc radius, the t-scour hole degree of depth, θ-bailing bucket end is chosen the angle.
1-overflow weir curve, bail behind the 3-in 2-narrow slit triangle pier position, 4-imperviousing preventing flushing layer, basis, 5-upstream, basis, downstream, 6-weir, 7-scour hole.
Energy-dissipating structure is made up of weir face 1 and bailing bucket 3, and weir face 1 can be built by laying bricks or stones by sandstone, and its sectional curve 1 is got four arc form, R1=0.5H, R2=0.2H, R3=0.04H, R4=H.Wherein H is a weir head, is generally 1.5-4 rice, and back bailing bucket is anti-circular arc, radius R=1.5 meter, and the bailing bucket end is chosen 30 °-35 ° at angle, and P is a height of weir 1-5 rice.
Evenly arrange triangle pier 2 in bailing bucket, the horizontal projection of pier is an isosceles triangle, and the Breadth Maximum of triangle pier 2 is b, apart from being bo, stitches widely than m=bo/b=0.8-1.2 between two piers, gets m=1 usually.There is infiltration corrosion inhibitor hole 8 two sides of triangle pier to triangle bottom surface, and the bottom surface of triangle pier and bailing bucket face fit.
With the site trial of this structure, 100 meters of dam lengths, dark 1.2 meters of the favourable opposition in downstream, 80,000 yuan of total investment of engineering are saved 4.2 ten thousand yuan, and effect of energy dissipation is good.
Claims (4)
1, a kind of soft basic spilling water weir energy-dissipating structure is characterized in that overflow weir adopts four circular curves, R1=0.5H, R2=0.2H, R3=0.04H, R4=H; Face rear portion, weir connects circular arc bailing bucket, uniform narrow slit triangle pier in the bailing bucket, and depth-width ratio is 2, stitches the wide 0.8-1.2 that compares.
2, a kind of soft basic spilling water weir energy-dissipating structure, it is characterized in that the overflow weir adopts elliptic curve to connect a circular curve type, wherein transverse is 0.4H, minor axis is 0.2H, and the ratio of major and minor axis is 2, and arc radius is R=H, connect an anti-circular arc bailing bucket behind the overflow weir, uniform narrow slit triangle pier in the bailing bucket, depth-width ratio is 2, stitching wide ratio is 0.8-1.2.
3, energy-dissipating structure according to claim 1 and 2 is characterized in that there is infiltration corrosion inhibitor hole said narrow slit triangle pier two sides to the bottom surface.
4, energy-dissipating structure according to claim 3 is characterized in that said narrow slit triangle pier is an isosceles triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90105175A CN1022340C (en) | 1990-07-16 | 1990-07-16 | Energy dissipation structure of soft foundation overflow dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90105175A CN1022340C (en) | 1990-07-16 | 1990-07-16 | Energy dissipation structure of soft foundation overflow dam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1049207A CN1049207A (en) | 1991-02-13 |
| CN1022340C true CN1022340C (en) | 1993-10-06 |
Family
ID=4879007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90105175A Expired - Fee Related CN1022340C (en) | 1990-07-16 | 1990-07-16 | Energy dissipation structure of soft foundation overflow dam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022340C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295398C (en) * | 2004-09-21 | 2007-01-17 | 河海大学 | Water bottom type drainage building middle pier for eliminating water overflow |
| CN1298935C (en) * | 2004-09-21 | 2007-02-07 | 河海大学 | Load distribution type drainage building middle pier for eliminating water overflow |
| CN101831892B (en) * | 2010-04-08 | 2011-07-20 | 重庆交通大学 | Hydropower station bank slope energy dissipation structure |
| CN103266583B (en) * | 2013-05-24 | 2015-05-20 | 中国水电顾问集团北京勘测设计研究院 | Bent slope underflow energy dissipation structure of water conservancy and hydropower engineering |
| CN108914893B (en) * | 2018-07-25 | 2020-05-19 | 黄河水利职业技术学院 | Hydraulically-driven sliding type energy dissipation device and construction method |
-
1990
- 1990-07-16 CN CN90105175A patent/CN1022340C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1049207A (en) | 1991-02-13 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |