CN103243693A - Method for performing drainage and energy dissipation by utilizing steps - Google Patents
Method for performing drainage and energy dissipation by utilizing steps Download PDFInfo
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- CN103243693A CN103243693A CN2013101867033A CN201310186703A CN103243693A CN 103243693 A CN103243693 A CN 103243693A CN 2013101867033 A CN2013101867033 A CN 2013101867033A CN 201310186703 A CN201310186703 A CN 201310186703A CN 103243693 A CN103243693 A CN 103243693A
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Abstract
The invention discloses a method for performing drainage and energy dissipation by utilizing steps. A drainage channel overflowing face is designed to be an identical-slope-ratio step structure. The ratio of height T to width h of identical-slope-ratio steps is designed slope ratio of the drainage channel overflowing face. The designed energy dissipation rate eta of a drainage channel is confirmed according to the total height P and the drainage amount q per unit width of the drainage channel and step roughness coefficient n of the identical-slope-ratio steps. The step roughness coefficient n of the identical-slope-ratio steps is confirmed according to protruding height delta of the identical-slope-ratio steps. The protruding height delta of the identical-slope-ratio steps is confirmed according to the step height T of the identical-slope-ratio steps and an included angle formed by the drainage face and a horizontal face. The step height T of the identical-slope-ratio steps is confirmed according to the drainage amount q per unit width of the drainage channel, and the drainage amount q per unit width of the drainage channel is confirmed according to the width B of the drainage channel. The drainage face is an oblique plane composed of oblique sides of a right angled triangle consisting of two right angled sides of each of identical-slope-ratio steps. The method for performing the drainage and the energy dissipation by utilizing the steps has the advantages of being simple in structure and saving engineering investment.
Description
Technical field
The present invention relates to the energy dissipating method of current by pass in the Hydraulic and Hydro-Power Engineering, especially relate to the method for utilizing step to carry out earial drainage and energy dissipating.
Background technology
In Hydraulic and Hydro-Power Engineering, for reaching the purpose of control current, elimination flood, rational exploitation and utilization water resource, often need build current by pass such as outlet structure escape works such as dredging flow groove.Current are when flowing through outlet structure escape works; often has bigger energy; as not handled at the stream that sluices down; following sluicing fails to be convened for lack of a quorum the downstream rivers and canals are caused and washes away; even the safety that jeopardizes building; therefore the unnecessary energy of stream that sluices down be must eliminate, the generation of washing away, the safety of protection building prevented.The form of eliminating the sluicing excess energy at present has three kinds: disspation through hydraudic jimp, flip trajectory bucket, submerged bucket dissipator.Low water head and the relatively poor situation of geological conditions during disspation through hydraudic jimp generally is applicable to, flip trajectory bucket generally are applicable to middle high water head and geological conditions situation preferably, and submerged bucket dissipator is applicable to that generally the depth of water is big, the situation of stable level.But because complexity and the diversity of waterpower, landform, geology and service condition, consider reasonability and the economy of engineering works, existing three kinds of energy dissipating modes also are not suitable for all engineerings, the suitable energy dissipating mode of the employing of therefore, suiting measures to local conditions to guarantee engineering safety, to reduce construction investment most important.
Summary of the invention
The object of the invention is to provide a kind of method of utilizing step to carry out earial drainage and energy dissipating, thereby more effectively and reasonably, sluicing stream energy under the economic elimination.
For achieving the above object, the present invention can take following technical scheme:
The method of utilizing step to carry out earial drainage and energy dissipating of the present invention is arranged to the spillwag chute of current by pass to compare ledge structure with the slope; The described design slope ratio that is described current by pass spillwag chute with the slope than the shoulder height T of step and the ratio of width h; The design energy dissipation rate η of current by pass determines according to the earial drainage discharge per unit width q of current by pass overall height P, current by pass with the step roughness n of slope than step; Described slope together is more definite than the step projecting height Δ of step with the slope than the step roughness n basis of step; Described slope together is more definite than the angle α of shoulder height T, earial drainage face and the horizontal plane of step with the slope than the step projecting height Δ basis of step; More definite according to the earial drainage discharge per unit width q of current by pass than the shoulder height T of step with the slope, the earial drainage discharge per unit width q of current by pass determines according to the current by pass width B; Described earial drainage face refers to the inclined-plane that constitutes by with the hypotenuse formed than step two right-angle sides of slope;
Described earial drainage discharge per unit width q is: Q=Q/B; In the formula: Q-earial drainage total flow, B-current by pass width.
Described energy dissipation rate η is:
In the formula: q-earial drainage discharge per unit width, P-current by pass overall height, n-step roughness;
Described step projecting height Δ is: Δ=T * cos α; In the formula: T-shoulder height, α-earial drainage face and horizontal plane angle;
Described step roughness n is: the n=Δ
1/6/ A; In the formula: A-each step unit width inclined-plane area.
Advantage of the present invention is mainly reflected in following aspect:
1, with described sloping than the spillwag chute of step as current by pass together, sluice under utilizing and flow falling on each grade step, improved the energy dissipation rate of time sluicing stream greatly, eliminated the energy of time sluicing stream, reduce the engineering quantity that the drainage gallery downstream is protected.
2, owing to the stream that sluices down falls energy dissipating at each grade step, therefore be not subjected to level of tail water variation to the influence of energy dissipating, simplified the service condition of energy dissipating.
3, take the layout of spillwag chute in drainage gallery of ledge structure, make simple in structure, convenient construction, engineering quantity is few, has improved efficiency of construction, has saved construction investment.
Description of drawings
Fig. 1 is current by pass arrangement schematic diagram of the invention process.
Fig. 2 is the I portion enlarged drawing of Fig. 1.
The specific embodiment
As shown in Figure 1, 2, the method for utilizing step to carry out earial drainage and energy dissipating of the present invention is arranged to the slope spillwag chute of current by pass (1) than step (2) structure; The described design slope ratio that is described current by pass (1) spillwag chute with the slope than the shoulder height T of step (2) and the ratio of width h; The design energy dissipation rate η of current by pass (1) determines according to the earial drainage discharge per unit width q of current by pass (1) overall height P, current by pass (1) with the step roughness n of slope than step (2); Described slope together is more definite than the step projecting height Δ of step (2) with the slope than the step roughness n basis of step (2); Described slope together is more definite than the angle α of shoulder height T, earial drainage face and the horizontal plane of step (2) with the slope than the step projecting height Δ basis of step (2); More definite according to the earial drainage discharge per unit width q of current by pass (1) than the shoulder height T of step (2) with the slope, the earial drainage discharge per unit width q of current by pass (1) determines according to current by pass (1) width B; Described earial drainage face refers to the inclined-plane that constitutes by with the hypotenuse formed than step (2) two right-angle sides of slope;
Described earial drainage discharge per unit width q is: Q=Q/B; In the formula: Q-earial drainage total flow, B-current by pass width.
Described energy dissipation rate η is:
In the formula: q-earial drainage discharge per unit width, P-current by pass overall height, n-step roughness;
Described step projecting height Δ is: Δ=T * cos α; In the formula: T-shoulder height, α-earial drainage face and horizontal plane angle;
Described step roughness n is: the n=Δ
1/6/ A; In the formula: A-each step unit width inclined-plane area.
Claims (1)
1. a method of utilizing step to carry out earial drainage and energy dissipating is characterized in that: the spillwag chute of current by pass (1) is arranged to the slope than step (2) structure; The described design slope ratio that is described current by pass (1) spillwag chute with the slope than the shoulder height T of step (2) and the ratio of width h; The design energy dissipation rate η of current by pass (1) determines according to the earial drainage discharge per unit width q of current by pass (1) overall height P, current by pass (1) with the step roughness n of slope than step (2); Described slope together is more definite than the step projecting height Δ of step (2) with the slope than the step roughness n basis of step (2); Described slope together is more definite than the angle α of shoulder height T, earial drainage face and the horizontal plane of step (2) with the slope than the step projecting height Δ basis of step (2); More definite according to the earial drainage discharge per unit width q of current by pass (1) than the shoulder height T of step (2) with the slope, the earial drainage discharge per unit width q of current by pass (1) determines according to current by pass (1) width B; Described earial drainage face refers to the inclined-plane that constitutes by with the hypotenuse formed than step (2) two right-angle sides of slope;
Described earial drainage discharge per unit width q is: Q=Q/B; In the formula: Q-earial drainage total flow, B-current by pass width;
Described energy dissipation rate η is:
In the formula: q-earial drainage discharge per unit width, P-current by pass overall height, n-step roughness;
Described step projecting height Δ is: Δ=T * cos α; In the formula: T-shoulder height, α-earial drainage face and horizontal plane angle;
Described step roughness n is: the n=Δ
1/6/ A; In the formula: A-each step unit width inclined-plane area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101867033A CN103243693A (en) | 2013-05-20 | 2013-05-20 | Method for performing drainage and energy dissipation by utilizing steps |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101867033A CN103243693A (en) | 2013-05-20 | 2013-05-20 | Method for performing drainage and energy dissipation by utilizing steps |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150093198A1 (en) * | 2013-09-30 | 2015-04-02 | Korea Institute Of Construction Technology | Inlet of underground reservoir having multiple-stage structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349048A (en) * | 2008-09-04 | 2009-01-21 | 四川大学 | Full section ladder energy dissipater |
| CN202090324U (en) * | 2011-05-20 | 2011-12-28 | 中国水电顾问集团西北勘测设计研究院 | Novel overflow cofferdam |
-
2013
- 2013-05-20 CN CN2013101867033A patent/CN103243693A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101349048A (en) * | 2008-09-04 | 2009-01-21 | 四川大学 | Full section ladder energy dissipater |
| CN202090324U (en) * | 2011-05-20 | 2011-12-28 | 中国水电顾问集团西北勘测设计研究院 | Novel overflow cofferdam |
Non-Patent Citations (1)
| Title |
|---|
| 汤升才等: "台阶式溢流坝试验研究与消能率计算", 《人民长江学报》, vol. 39, no. 12, 30 June 2008 (2008-06-30), pages 45 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150093198A1 (en) * | 2013-09-30 | 2015-04-02 | Korea Institute Of Construction Technology | Inlet of underground reservoir having multiple-stage structure |
| CN104514274A (en) * | 2013-09-30 | 2015-04-15 | 韩国建设技术研究院 | Inlet of underground reservoir having multiple-stage structure |
| US9534369B2 (en) * | 2013-09-30 | 2017-01-03 | Korea Institute Of Construction Technology | Inlet of underground reservoir having multiple-stage structure |
| CN104514274B (en) * | 2013-09-30 | 2017-01-11 | 韩国建设技术研究院 | Inlet of underground reservoir having multiple-stage structure |
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Application publication date: 20130814 |