CN1144864A - Soft-base low-weir spillway dam energy-dissipation structure - Google Patents
Soft-base low-weir spillway dam energy-dissipation structure Download PDFInfo
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- CN1144864A CN1144864A CN96115045A CN96115045A CN1144864A CN 1144864 A CN1144864 A CN 1144864A CN 96115045 A CN96115045 A CN 96115045A CN 96115045 A CN96115045 A CN 96115045A CN 1144864 A CN1144864 A CN 1144864A
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Abstract
An energy-sinking structure of overflow dam for soft-foundation weir features that an energy-sinking plate with holes whose hole area ratio is 20-30% is built at a downstream position a certain distance apart from the planar dam and the water stream passed throug the plate can form a mixed flow state of bottom flow and bailed flow, which are mixed and generate friction between them to consume energy. Its advantages include reducing wave height by more than one time and flushed depth by 60% and saving investment by 10%.
Description
The present invention is a kind of energy-dissipating structure of novel mixing pattern, is applicable to the overflow weir of diversion irrigation projects.
The method that barrage diversion both at home and abroad at present is used to irrigate is more, extensively adopt overfall dam, but its energy dissipating mode has nothing in common with each other, as bavin stone overfall dam, construction is simple, can gather materials on the spot, the downstream does not have the energy dissipating measure, and very easily destroy by rush of water flood period, and application life is short, so need maintenance every year, if things go on like this, take a lot of work, time-consuming, expensive, annual maintenance cost, per thousand reach ten thousand yuan of 900-1500, and need a large amount of timber of felling, influence ecological environment.Though and employing stone masonry overfall dam dam body is firmer, the downstream is washed away seriously, directly endangers engineering.Adopt the underflow type energy dissipating method, the construction investment height, every meter reaches 2200-2400 unit, and then ten thousand yuan of 22-24 need be invested in per hundred meters wide river courses.
The objective of the invention is to propose a kind of low flat-slab deck dam orifice plate type energy-dissipating structure that is applicable to soft base, that has reduced current gathers around wave highly, has reduced the scour depth in downstream, guarantees engineering safety, increases the service life, and saves construction investment.
The object of the present invention is achieved like this: overfall dam is a flat-slab deck dam, and it highly is lower than 5 meters, and apart from plate 2.5-3.0 times of height of dam place, dam (weir), it is energy-dissipation orifice plate that an orifice plate with holes is set at the rear portion, dam; The size in hole is generally the circular hole about φ=15 centimetre, the area in its hole accounts for the 20-30% of the orifice plate gross area, the orifice plate height is a 0.4-0.5 times of height of dam, flow-shape is underflow and bailing bucket stream mixing pattern, orifice plate can make the abundant blending of current, reaches the purpose of energy dissipating, promptly forms the whirlpool district before orifice plate, behind orifice plate, form the district of circling round, have the part current to overflow from the orifice plate top.
Advantage of the present invention is:
1, forms a kind of new underflow and the fluidised form that bailing bucket stream mixes mutually, do not recover underflow with the downstream water depth increase.
2, under the lower condition of downstream water depth, form mixed flow easily, applied range.
3, reduce the downstream significantly and gather around the wave height, it gathers around unrestrained aspect ratio surface current, bucket typed stilling reduces more than one times, reduces by 20% than soft basic narrow slit bucket typed stilling, reduces washing away two sides.
4, compare with the disspation through hydraudic jimp engineering, save construction investment more than 36%.
5, reduce the downstream scour depth, reduce 60%, reduce more than 20% than narrow slit pier bucket typed stilling than bucket typed stilling scour depth.
6, guarantee the overflow safety of dam body, prolong the engineering life-span, be applicable to soft basic gravel riverbed.
Below in conjunction with case history and accompanying drawing details of the present invention is further described.
Fig. 1 is overflow plate dam, pore plate energy dissipation structural representation.
Fig. 2 is a floor dam schematic diagram.
Fig. 3 is the orifice structure schematic diagram.
Fig. 4 is the profile of Fig. 1.
With reference to the accompanying drawings, H-weir head among the figure, P-height of dam, Ht-downstream water depth, a-orifice plate height, B-floor dam and orifice plate spacing, the t-scour hole degree of depth.
The energy-dissipating structure schematic diagram has: 1-plate dam, 2-floor, 3-imperviousing preventing flushing layer, 4 orifice plates, basis, 5-upstream, basis, 6-downstream, 7-scour hole.
Energy-dissipating structure comprises plate dam 1, is embedded in the upstream base and goes out in 5, and it is not higher than 5 meters, has floor 2 to support thereafter.Orifice plate 4 is established in downstream at 12.5-15 rice, distance plate dam.Be covered with the circular hole of 15 centimetres of φ on it, the summation of hole area accounts for the 20-30% of the orifice plate gross area, and orifice plate 4 high 1.5-2.25 rice are embedded among the basis, downstream 6.Experimental results show that its scour hole 7 is significantly less than energy-dissipating structure in the past.
Use this method experimental project, 100 meters of dam lengths, 1.5 meters of heights of dam, energy dissipating plate are apart from 4 meters of dam plates, and it is 30% that the energy dissipating hole gross area accounts for energy dissipating plate area ratio, dark 0.9 meter of the favourable opposition in downstream, construction investment: 140,000 yuan, compare with disspation through hydraudic jimp and to save ten thousand yuan of 8-10.Effect of energy dissipation is good.
Claims (1)
1, a kind of novel hydraulic engineering energy-dissipating structure, it is characterized in that at the rear portion, weir energy dissipating plate with holes being set, i.e. energy-dissipation orifice plate apart from weir plate 2.5-3.0 times of height of weir place, the energy-dissipation orifice plate height is a 0.3-0.50 times of height of weir, and the hole area of energy-dissipation orifice plate is 0.2-0.3 with the ratio of the plate area of orifice plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96115045 CN1060834C (en) | 1996-01-24 | 1996-01-24 | Soft-base low-weir spillway dam energy-dissipation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96115045 CN1060834C (en) | 1996-01-24 | 1996-01-24 | Soft-base low-weir spillway dam energy-dissipation structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1144864A true CN1144864A (en) | 1997-03-12 |
| CN1060834C CN1060834C (en) | 2001-01-17 |
Family
ID=5122346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96115045 Expired - Fee Related CN1060834C (en) | 1996-01-24 | 1996-01-24 | Soft-base low-weir spillway dam energy-dissipation structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1060834C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381642C (en) * | 2006-06-20 | 2008-04-16 | 四川大学 | Dissipater of hole stopper |
| CN101408022B (en) * | 2008-11-05 | 2012-09-05 | 福建省水利水电勘测设计研究院 | Water gate dipper type shunting energy dissipating rushing-proof technology |
| CN104153329A (en) * | 2014-07-07 | 2014-11-19 | 成都科创佳思科技有限公司 | Wave dissipating plate structure |
| CN112267440A (en) * | 2020-10-16 | 2021-01-26 | 西华大学 | Energy dissipation structure for flood discharge of hydropower station |
-
1996
- 1996-01-24 CN CN 96115045 patent/CN1060834C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381642C (en) * | 2006-06-20 | 2008-04-16 | 四川大学 | Dissipater of hole stopper |
| CN101408022B (en) * | 2008-11-05 | 2012-09-05 | 福建省水利水电勘测设计研究院 | Water gate dipper type shunting energy dissipating rushing-proof technology |
| CN104153329A (en) * | 2014-07-07 | 2014-11-19 | 成都科创佳思科技有限公司 | Wave dissipating plate structure |
| CN112267440A (en) * | 2020-10-16 | 2021-01-26 | 西华大学 | Energy dissipation structure for flood discharge of hydropower station |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1060834C (en) | 2001-01-17 |
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