CN103966985B - A kind of side direction goes out to flow the absorption basin of rotary roll energy dissipating - Google Patents
A kind of side direction goes out to flow the absorption basin of rotary roll energy dissipating Download PDFInfo
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- CN103966985B CN103966985B CN201410198412.0A CN201410198412A CN103966985B CN 103966985 B CN103966985 B CN 103966985B CN 201410198412 A CN201410198412 A CN 201410198412A CN 103966985 B CN103966985 B CN 103966985B
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- absorption basin
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- groove pond
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- rotary roll
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Abstract
The invention discloses the absorption basin that a kind of side direction goes out to flow rotary roll energy dissipating, be positioned at downstream river course flow inlet forward portion groove pond form by being positioned at the overfall dam rear portion groove pond that is arranged on upper river and connecting with this part groove pond, the axes intersect in two parts groove pond, overall is bending structure at in-plane, the current flowing through overfall dam enter on rear side of absorption basin generation hydraulic jump and flow out absorption basin to rotary roll, make current be able to energy dissipating.The present invention has overturned traditional absorption basin plane arrangement structure, has filled up in prior art to lack that to be suitable for building absorption basin at river course bend blank, the problem such as simultaneously solve that traditional absorption basin open excavation amount is large, effect of energy dissipation is undesirable.
Description
Technical field
The invention belongs to Hydraulic and Hydro-Power Engineering flood-discharge energy-dissipating technical field, be specifically related to the absorption basin that a kind of hinge entirety being applicable to be arranged on turning, river course needs energy dissipating.
Background technology
Absorption basin is impel the energy-dissipating installation producing underflow type hydraulic jump in downstream, river course or outlet structure escape works downstream.Absorption basin can make down to let out torrent and become unhurried current rapidly, generally the kinetic energy of the lower stream that sluices can be eliminated 40% ~ 70%, and can shorten protection-apron length, is a kind of effectively energy-dissipating installation of economy.The design of absorption basin in hydraulic engineering, its length affects the very important factor of absorption basin effect of energy dissipation, and the length of absorption basin and hydraulic jump length closely related.Conventional absorption basin applies the counterforce contrary with water (flow) direction by design tail bank in hydraulic jump section, can effectively reduce hydraulic jump length, and then reaches reduction absorption basin length, reduces the object of engineering construction amount.The absorption basin hydraulic jump length being designed with tail bank be generally absorption basin tail bank situation is not set under hydraulic jump length (i.e. the free hydraulic jump length of flat channel) 70% ~ 80%.Although can reduce the length of absorption basin by arranging tail bank, the length of absorption basin is still longer.
Be provided with traditional absorption basin of tail bank, in fact still can only form hydraulic jump form backflow in absorption basin stem, current become unhurried current from torrent, and become the flow turbulence after unhurried current still comparatively violent, effect of energy dissipation is very poor, and water velocity bottom it is still very large; Due to above-mentioned two reasons, in order to increase effect of energy dissipation, what need absorption basin to build is very long, again through adjusting more fully after making current complete hydraulic jump in absorption basin, water velocity is distributed more even, and turbulent fluctuation just can enter downstream river course after consuming further, otherwise easily more serious washing away is caused to downstream river course.Therefore, traditional absorption basin needs to be arranged in the more satisfactory position of both sides, river course slope geological condition, and need to arrange along straight section direction, river course, just can reach length and the degree of depth that absorption basin design wants, ensure that the lower stream energy dissipating that sluices is abundant, steadily be connected with downstream river course, avoid the problem such as to wash away to downstream river course.
Because many overfall dam absorption basins are built at high mountain gorge place, bank slope geological condition more complicated, turning in river is also the commonplace engineering specifications run into, and the very difficult guarantee sometimes of the geological conditions of straight section place, river bank, both sides side slope meets engineering construction requirement, the traditional absorption basin therefore building high mountain gorge place in is difficult to meet energy dissipating requirement.If river course is very short distance inside turn after dam, because the straight part of bend is very narrow, the length requirement of traditional absorption basin can not be met, the arrangement form of traditional absorption basin cannot be adopted at all, need to find the Dissipation of Energy that a kind of new absorption basin arrangement form solves river course racetrack portion.
And traditional absorption basin imports and exports direction all along river course direction, for upstream, river course high water head environment, the speed of the lower stream that sluices is very high, the energy carried under one's arms is very large, for reaching the effect of abundant energy dissipating, the degree of depth of absorption basin and length all need very large, and guarantee goes out pond current and is connected with the steady of downstream river course current, and this builds the cost of absorption basin by greatly increasing.
Summary of the invention
For the state of the art and the deficiency of traditional absorption basin, object of the present invention aims to provide the absorption basin that a kind of side direction of overturning traditional absorption basin plane arrangement structure goes out to flow rotary roll energy dissipating, be suitable for building absorption basin blank at river course bend to fill up in prior art to lack, solve the problems such as traditional absorption basin open excavation amount is large, effect of energy dissipation is undesirable simultaneously.
Above-mentioned purpose of the present invention, the absorption basin that can go out flow by the side direction be made up of following technical proposals rotary roll energy dissipating realizes.
Side direction provided by the invention goes out to flow the absorption basin of rotary roll energy dissipating, be positioned at downstream river course flow inlet forward portion groove pond form by being positioned at the overfall dam rear portion groove pond that is arranged on upper river and connecting with this part groove pond, the axes intersect in two parts groove pond, overall is bending structure at in-plane, the current flowing through overfall dam enter on rear side of absorption basin generation hydraulic jump and flow out absorption basin to rotary roll, make current be able to energy dissipating.
In technique scheme of the present invention, the axis in overfall dam rear portion groove pond and the axis in downstream river course flow inlet forward portion groove pond be that the concrete size of angle can adjust flexibly according to river course situation of turning, in order to improve the outside abutment wall in downstream river course flow inlet forward portion groove pond to the acting in opposition of current after hydraulic jump, axis and the axis general control in downstream river course flow inlet forward portion groove pond in overfall dam rear portion groove pond be 60 ° ~ 120 ° crossing, further, the axis in overfall dam rear portion groove pond is paid the utmost attention in 90 ° crossing with the axis in downstream river course flow inlet forward portion groove pond.
In technique scheme of the present invention, in order to reduce the speed of absorption basin exit underflow further, current in absorption basin being connected with water flow stationary in downstream river course, can considering to arrange a tail bank at the afterbody in downstream river course flow inlet forward portion groove pond.
In technique scheme of the present invention, in order to meet engineering operation needs, the peripheral wall height forming groove pond is not less than design flood level height.
In technique scheme of the present invention, form the abutment wall in groove pond, can consider to be designed to vertical stratification abutment wall according to river course environment geological conditions, also can be designed as the hierarchic structure abutment wall that tilts laterally or ramp structure abutment wall.
In technique scheme of the present invention, in order to while realizing energy dissipation by hydraulic jump, further shortening absorption basin hydraulic jump length, the length of the inner side abutment wall in formation overfall dam rear portion groove pond is paid the utmost attention to and is greater than absorption basin hydraulic jump length, further pays the utmost attention to 1.1 ~ 1.3 times into absorption basin hydraulic jump length.Described absorption basin hydraulic jump length can be given by the following formula, as formula L
j=(0.42 ~ 0.64) × L
k, wherein L
jfor side direction goes out to flow the absorption basin hydraulic jump length of rotary roll energy dissipating, L
kfor the free hydraulic jump length of flat channel, L
kdesign formulas be existing formula, can directly find from textbook " hydraulics ".
In technique scheme of the present invention, force reduction pool bottom is paid the utmost attention to and is designed to flat-bottom structure; Form to pay the utmost attention at the bottom of the pond in described downstream river course flow inlet forward portion groove pond and be designed to be not less than riverbed, pay the utmost attention to further and be designed to flush with riverbed.
Side direction provided by the invention goes out to flow the absorption basin of rotary roll energy dissipating, coordinate the use of other outlet structure escape works in hinge entirety, both absorption basin construction can have been met at turning, river course, the effect of energy dissipation of absorption basin can be improved by the rotary roll of current after increase hydraulic jump again, can select for when building Hydraulic and Hydro-Power Engineering at turning, river course.The absorption basin that side direction provided by the invention goes out to flow rotary roll energy dissipating has overturned the arrangement of traditional absorption basin completely, brings following very outstanding technique effect:
1, because current direction of advance after hydraulic jump can all block by the outside abutment wall in the downstream river course flow inlet forward portion groove pond forming absorption basin, binding effect to be obviously better than in traditional absorption basin end tail bank for the binding effect of hydraulic jump, formed thus and the opposite direction of hydraulic jump section is retrained, thus make hydraulic jump contraction in length be 42% ~ 64% of the free hydraulic jump length of flat channel, compared with traditional absorption basin, hydraulic jump length can be shortened 20 ~ 40% further, in less scope, reach effect of energy dissipation; Simultaneously due to the existence of abutment wall outside absorption basin downstream river course flow inlet forward portion groove pond, compared with traditional absorption basin, when ensure identical flood degree, force reduction pool bottom elevation suitably can also be raised, thus reduce open excavation amount, and reduce difficulty of construction, reducing the construction costs.
2, at the position that overfall dam rear portion groove pond connects with downstream river course flow inlet forward portion groove pond, due to the existence of hydraulic jump, excessive surge can not be produced to the outside abutment wall in downstream river course flow inlet forward portion groove pond.In addition, the outside abutment wall in current and downstream river course flow inlet forward portion groove pond interacts, form rotary roll in a lateral direction, large quantity of air can be involved in by Involving velocity simultaneously, increase the turbulent fluctuation of water body, a part of mechanical energy of water body is consumed with turbulent fluctuation energy form in turbulent fluctuation process, increases the effect of energy dissipation of absorption basin.
3, after current produce hydraulic jump in overfall dam rear portion groove pond, downstream river course flow inlet forward portion groove pond is entered with rotary roll form, in this part groove pond, advance with the form of spiral flow, in the process, its path flow through, by long more a lot of along the flow path in a direction than tradition, by consuming a large amount of energy, has good effect of energy dissipation.
4, the current flowing through overfall dam enter on rear side of absorption basin generation hydraulic jump and flow out absorption basin to rotary roll, and the flow velocity that the current after lot of energy are going out pond can be lower, stronger to the scour protection in downstream.
Accompanying drawing explanation
Fig. 1 is the floor map of the traditional absorption basin in river course straight section layout.
Fig. 2 is the axial flow-shape schematic diagram of traditional absorption basin import arranged at river course straight section.
Fig. 3 A is the floor map that side direction that embodiment 1 provides goes out to flow the absorption basin of rotary roll energy dissipating.
Fig. 3 B is the floor map that side direction that embodiment 2 provides goes out to flow the absorption basin of rotary roll energy dissipating.
Fig. 3 C is the floor map that side direction that embodiment 4 provides goes out to flow the absorption basin of rotary roll energy dissipating.
Fig. 3 D is the floor map that side direction that embodiment 5 provides goes out to flow the absorption basin of rotary roll energy dissipating.
Fig. 4 A is under the outside abutment wall vertical case in the downstream river course flow inlet forward portion groove pond that embodiment 1 provides, and side direction goes out to flow the axial flow-shape schematic diagram of absorption basin import of rotary roll energy dissipating.
Fig. 4 B is in the outward-dipping situation of outside abutment wall in the downstream river course flow inlet forward portion groove pond that embodiment 3 provides, and side direction goes out to flow the axial flow-shape schematic diagram of absorption basin import of rotary roll energy dissipating.
In above-mentioned accompanying drawing, the object of each drawing reference numeral mark is respectively: 1-upper river; 2-downstream river course; 3-overfall dam; 4-tail bank; Abutment wall on the left of 5-absorption basin; Abutment wall on the right side of 6-absorption basin; 7-overfall dam dam crest; 8-hydraulic jump; 9-overfall dam rear portion groove pond; 10-downstream river course flow inlet forward portion groove pond; The inner side abutment wall in 11-overfall dam rear portion groove pond; The outside abutment wall in 12-overfall dam rear portion groove pond; The inner side abutment wall in 13-downstream river course flow inlet forward portion groove pond; The outside abutment wall in 14-downstream river course flow inlet forward portion groove pond.
Detailed description of the invention
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1
The side direction that the present embodiment provides goes out to flow the absorption basin of rotary roll energy dissipating, as shown in Figure 3A, be positioned at downstream river course flow inlet forward portion groove pond 10 form by being positioned at the overfall dam rear portion groove pond 9 that is arranged on upper river and connecting with this part groove pond, the axis in two parts groove pond is 90 ° and intersects, the current flowing through overfall dam 3 enter on rear side of absorption basin generation hydraulic jump 8 and flow out absorption basin to rotary roll, make current be able to energy dissipating.The afterbody in downstream river course flow inlet forward portion groove pond 10 is provided with tail bank 4.Inner side abutment wall 11, the outside abutment wall 12 in the overfall dam rear portion groove pond of absorption basin, and the inner side abutment wall 13 in downstream river course flow inlet forward portion groove pond and outside abutment wall 14 are vertical stratification abutment wall, and their height equals design flood level height.Form its position at the bottom of the pond in downstream river course flow inlet forward portion groove pond 10 to flush with riverbed.
The side direction that the present embodiment provides goes out to flow the axial flow-shape schematic diagram of absorption basin import of rotary roll energy dissipating as shown in Figure 4 A, current in upper river 1 enter absorption basin through overfall dam 3 dam crest 7, the place connected with force reduction pool bottom bottom overfall dam 3 produces hydraulic jump 8, current move ahead in process and interact with the outside abutment wall 14 in downstream river course flow inlet forward portion groove pond, under the opposition of the outside abutment wall 14 in downstream river course flow inlet forward portion groove pond, turning, form backflow.Absorption basin hydraulic jump length is determined by following formula, L
j=(0.42 ~ 0.64) × L
k, wherein L
jfor described side direction goes out to flow the absorption basin hydraulic jump length of rotary roll energy dissipating, L
kfor the free hydraulic jump length of flat channel.The length L=1.1L of the inner side abutment wall 11 in overfall dam rear portion groove pond in the present embodiment
j.The outside abutment wall 14 in downstream river course flow inlet forward portion groove pond is perpendicular to horizontal plane.The absorption basin hydraulic jump length that the side direction that the present embodiment provides goes out to flow rotary roll energy dissipating is 42% ~ 64% of the free hydraulic jump length of flat channel, compared with traditional absorption basin, hydraulic jump length can be shortened 20 ~ 40% further.The hydraulic jump contraction in length produced shows to reach effect of energy dissipation in less scope, obviously reduces the engineering excavation amount in absorption basin overfall dam rear portion groove pond 9.
At the position that overfall dam rear portion groove pond 9 connects with downstream river course flow inlet forward portion groove pond 10, due to the existence of hydraulic jump 8, excessive surge can not be produced to the outside abutment wall 14 in downstream river course flow inlet forward portion groove pond.In addition, the outside abutment wall 14 in current and downstream river course flow inlet forward portion groove pond interacts, and forms rotary roll in a lateral direction, enters downstream river course flow inlet forward portion groove pond 10 with rotary roll form.In downstream river course flow inlet forward portion groove pond 10, advance with the form of spiral flow, in the process; its path flow through is by long more a lot of along the flow path in a direction than tradition; to a large amount of energy be consumed, therefore its go out pond flow velocity can be lower, stronger to the scour protection in downstream.
In addition, the outside abutment wall 14 in current and downstream river course flow inlet forward portion groove pond interacts, form rotary roll in a lateral direction, large quantity of air can be involved in by Involving velocity simultaneously, increase the turbulent fluctuation of water body, a part of mechanical energy of water body is consumed with turbulent fluctuation energy form in turbulent fluctuation process, increases the effect of energy dissipation of absorption basin.
Embodiment 2
The side direction that the present embodiment provides goes out to flow the absorption basin of rotary roll energy dissipating, its structure as shown in Figure 3 B, the absorption basin going out to flow rotary roll energy dissipating with the side direction described in embodiment 1 is substantially identical, 1.2 times of absorption basin hydraulic jump length that to be the length of the inner side abutment wall 11 in overfall dam rear portion groove pond be in difference place, the afterbody in downstream river course flow inlet forward portion groove pond does not arrange tail bank 4, form the inner side abutment wall 11 in the overfall dam rear portion groove pond of absorption basin, the inner side abutment wall 13 in outside abutment wall 12 and downstream river course flow inlet forward portion groove pond, the height of outside abutment wall 14 equals 1.2 times of design flood level height.
Embodiment 3
The side direction that the present embodiment provides goes out to flow the absorption basin of rotary roll energy dissipating, its structure as shown in Figure 3 B, the absorption basin going out to flow rotary roll energy dissipating with the side direction described in embodiment 1 is substantially identical, 1.2 times of absorption basin hydraulic jump length that to be the length of the inner side abutment wall 11 in overfall dam rear portion groove pond be in difference place, the afterbody in downstream river course flow inlet forward portion groove pond does not arrange tail bank 4, form the inner side abutment wall 11 in the overfall dam rear portion groove pond of absorption basin, the inner side abutment wall 13 in outside abutment wall 12 and downstream river course flow inlet forward portion groove pond, outside abutment wall 14 is the ramp structure abutment wall tilted laterally, and their height equals 1.1 times of design flood level height.
The side direction that the present embodiment provides goes out to flow the axial flow-shape schematic diagram of absorption basin import of rotary roll energy dissipating as shown in Figure 4 B.
Embodiment 4
The side direction that the present embodiment provides goes out to flow the absorption basin of rotary roll energy dissipating, its structure as shown in Figure 3 C, the absorption basin going out to flow rotary roll energy dissipating with the side direction described in embodiment 1 is substantially identical, to be the axis in overfall dam rear portion groove pond 9 and downstream river course flow inlet forward portion groove pond 10 be in difference place 120 ° intersect; The outside abutment wall 12 in overfall dam rear portion groove pond 9 is vertical stratification abutment wall, inner side abutment wall 11 is outside vertical riser structure abutment wall, the inner side abutment wall 13 in downstream river course flow inlet forward portion groove pond is vertical stratification abutment wall, and outside abutment wall 14 is ramp structure abutment wall; The length of the inner side abutment wall 11 in overfall dam rear portion groove pond is 1.3 times of absorption basin hydraulic jump length; Form 1.5 times that the inner side abutment wall 11 in the overfall dam rear portion groove pond of absorption basin, outside abutment wall 12 and the inner side abutment wall 13 in downstream river course flow inlet forward portion groove pond, the height of outside abutment wall 14 equal design flood level height; Form its position at the bottom of the pond in downstream river course flow inlet forward portion groove pond 10 a little more than riverbed.
Embodiment 5
The side direction that the present embodiment provides goes out to flow the absorption basin of rotary roll energy dissipating, its structure as shown in Figure 3 D, the absorption basin going out to flow rotary roll energy dissipating with the side direction described in embodiment 4 is substantially identical, and difference place is, the afterbody in downstream river course flow inlet forward portion groove pond 10 does not arrange tail bank 4; Form 1.05 times that the inner side abutment wall 11 in the overfall dam rear portion groove pond of absorption basin, outside abutment wall 12 and the inner side abutment wall 13 in downstream river course flow inlet forward portion groove pond, the height of outside abutment wall 14 equal design flood level height.
Claims (10)
1. a side direction goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, be positioned at downstream river course flow inlet forward portion groove pond (10) form by being positioned at the overfall dam rear portion groove pond (9) that is arranged on upper river (1) and connecting with this part groove pond, the length forming the inner side abutment wall (11) in described overfall dam rear portion groove pond is greater than the hydraulic jump length that current enter absorption basin generation, the axes intersect in two parts groove pond is 60 ° ~ 120 °, overall is bending structure at in-plane, the current flowing through overfall dam enter on rear side of absorption basin generation hydraulic jump and flow out absorption basin to rotary roll, current are made to be able to energy dissipating.
2. side direction according to claim 1 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, the afterbody in described downstream river course flow inlet forward portion groove pond is provided with tail bank (4).
3. side direction according to claim 1 and 2 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, the peripheral wall height forming described groove pond is not less than design flood level height.
4. side direction according to claim 1 and 2 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, the abutment wall forming described groove pond is vertical stratification abutment wall, hierarchic structure abutment wall or ramp structure abutment wall.
5. side direction according to claim 3 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, the abutment wall forming described groove pond is vertical stratification abutment wall, hierarchic structure abutment wall or ramp structure abutment wall.
6. side direction according to claim 1 and 2 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, the length forming the inner side abutment wall in described overfall dam rear portion groove pond is the hydraulic jump length 1.1 ~ 1.3 times that current enter absorption basin generation.
7. side direction according to claim 4 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, the length forming the inner side abutment wall in described overfall dam rear portion groove pond is the hydraulic jump length 1.1 ~ 1.3 times that current enter absorption basin generation.
8. side direction according to claim 5 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, the length forming the inner side abutment wall in described overfall dam rear portion groove pond is the hydraulic jump length 1.1 ~ 1.3 times that current enter absorption basin generation.
9. side direction according to claim 8 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, described absorption basin hydraulic jump length is determined by following formula:
L
j＝(0.42～0.64)×L
k
Wherein L
jfor described side direction goes out to flow the absorption basin hydraulic jump length of rotary roll energy dissipating, L
kfor the free hydraulic jump length of flat channel.
10. side direction according to claim 1 and 2 goes out to flow the absorption basin of rotary roll energy dissipating, it is characterized in that, forms at the bottom of the pond in described downstream river course flow inlet forward portion groove pond and is not less than riverbed.
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| CN104499454B (en) * | 2014-12-15 | 2016-01-27 | 四川大学 | The fluidised form being applicable to have torrent bend is connected building |
| CN105350502B (en) * | 2015-12-10 | 2017-03-29 | 中水东北勘测设计研究有限责任公司 | Improve non-pressure tunnel to have to go to the toilet the method for curved segment high-velocity flow fluidised form |
| CN106120678B (en) * | 2016-06-30 | 2018-09-07 | 中国电建集团昆明勘测设计研究院有限公司 | Non-pressure tunnel plane steering water flow connection building |
| CN110644446B (en) * | 2019-08-07 | 2020-11-24 | 河海大学 | Three-dimensional rectifying pool and rectifying method for lateral inflow of pump station |
| CN112854151B (en) * | 2021-01-15 | 2022-06-03 | 安徽省引江济淮集团有限公司 | Rectifying energy dissipation well-falling device |
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Granted publication date: 20160413 Termination date: 20170512 |