CN103498452B - The slit structure of high steep Narrow Valleys outlet structure escape works - Google Patents
The slit structure of high steep Narrow Valleys outlet structure escape works Download PDFInfo
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- CN103498452B CN103498452B CN201310488739.7A CN201310488739A CN103498452B CN 103498452 B CN103498452 B CN 103498452B CN 201310488739 A CN201310488739 A CN 201310488739A CN 103498452 B CN103498452 B CN 103498452B
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Abstract
The invention discloses a kind of slit structure of high steep Narrow Valleys outlet structure escape works, comprising: the little subsides angle of first side wall, second side wall, abutment wall and base plate; Described slit structure end shrinks and is provided with the little subsides angle of described abutment wall simultaneously; The shrinkage ratio of slit is 0.3 ~ 0.45; Shrink between described first side wall and described second side wall and make overflow in vertical and suitable river to diffusion dissipation, described abutment wall little subsides angle prevents that spallation overflow is dry pounds this bank; Described slit structure control overflow drop point scope is positioned at riverbed center range.The present invention takes full advantage of the feature of Slit-type Bucket Jets spatial dispersion energy dissipating, simplify the energy-dissipating structure of high steep Narrow Valleys outlet structure escape works, effectively reduce scour hole depth and inshore current velocity, thus the requirement of shelter greatly reduced bank slope and basis, riverbed, alleviate the impact on ecological environment and nodal region bank slope and destruction, reduce engineering quantity and construction investment.
Description
Technical field
The present invention relates to the sluicing energy-dissipating structure technical field of Hydraulic and Hydro-Power Engineering, particularly relate to a kind of slit structure of high steep Narrow Valleys outlet structure escape works.
Background technology
The outlet structure escape works of high steep Narrow Valleys generally adopt the energy dissipating of straight flange wall Slit-type Bucket Jets, abutment wall crest level adds to increase safely by the highest water surface curve to be determined, its peripheral wall height often reaches more than 20m, owing to choosing bank unreasonable structure, work arrangement is also difficult to implement, and chooses overflow in adfluxion and often push up and rush opposite bank, or spallation overflow is dry pounds this bank, punching hole is comparatively dark, and bank flow rate of water flow is larger.Not only the engineering quantity of construction phase of project outlet structure escape works energy-dissipating structure and bank slope protection measure is large, invest high, and runtime flood-discharge energy-dissipating can have a strong impact on the safety of main structures, easily causes Slope Failure or outlet structure escape works energy-dissipating structure to destroy.
Summary of the invention
The object of the present invention is to provide a kind of structure simple and energy dissipating is abundant, effectively can alleviate main structures impact and the slit structure of the steep Narrow Valleys outlet structure escape works of height destroyed, thus solve the foregoing problems existed in prior art.
To achieve these goals, the technical solution used in the present invention is as follows:
A slit structure for high steep Narrow Valleys outlet structure escape works, comprising: the little subsides angle of first side wall, second side wall, abutment wall and base plate; Described slit structure end shrinks and is provided with the little subsides angle of described abutment wall simultaneously; The shrinkage ratio of slit is 0.3 ~ 0.45; Shrink between described first side wall and described second side wall and make overflow in vertical and suitable river to diffusion dissipation, described abutment wall little subsides angle prevents that spallation overflow is dry pounds this bank; Described slit structure control overflow drop point scope is positioned at riverbed center range.
Preferably, described first side wall and described second side wall are asymmetric structure.
Preferably, the upstream face of described first side wall is straight flange wall, and the upstream face of described second side wall is the upstream face of circular arc wall or described second side wall is straight flange wall, and the upstream face of described first side wall is circular arc wall; Described first side wall and described second side coping are straight slope or slope or folded slope shape, and described first side wall and described second side coping elevation are lower than water surface curve; The end of described first side wall and described second side wall aligns or is staggeredly arranged.
Preferably, described circular arc wall is the circular arc wall of large radius.
Preferably, the circular arc wall of described circular arc wall to be arc radius be more than 30m.
Preferably, described abutment wall little subsides angle is arranged in wall side, described first side or is arranged in wall side, described second side.
Preferably, described abutment wall little subsides angle is tangent is arranged in wall downstream, described first side or wall downstream, described second side.
Preferably, described abutment wall little subsides angle is short circular arc wall or the straight flange wall of small radius.
Preferably, when described abutment wall little subsides angle is short circular arc wall, its arc radius is 2m ~ 5.5m.
Preferably, described base plate is the negative slope of flat slope or the angle of depression≤-10 °.
The invention has the beneficial effects as follows:
By rationally arranging the slit structure of outlet structure escape works, fluid inertia is utilized to reduce peripheral wall height, make overflow in vertical and suitable river to fully pulling open diffusion dissipation, improve aerial energy dissipation rate, avoid that concentrated overflow top rushes opposite bank, spallation overflow is dry pounds this bank, make overflow drop point scope be positioned at center, riverbed, effectively reduce scour hole depth and inshore current velocity, thus greatly reduce the requirement of shelter to bank slope and basis, riverbed.The present invention takes full advantage of the feature of Slit-type Bucket Jets spatial dispersion energy dissipating, simplify energy-dissipating structure and the bank slope protection measure of high steep Narrow Valleys outlet structure escape works, alleviate the impact on ecological environment and nodal region bank slope and destruction, reduce engineering quantity and construction investment, obtain good Social benefit and economic benefit, there is directive significance and dissemination widely.
Accompanying drawing explanation
Fig. 1 is the tangent floor map of abutment wall of the present invention little subsides angle and first side wall;
Fig. 2 is A-A sectional view in Fig. 1;
Fig. 3 is B-B sectional view in Fig. 1;
Fig. 4 is the tangent floor map of abutment wall of the present invention little subsides angle and second side wall;
Fig. 5 is C-C sectional view in Fig. 1;
Fig. 6 is D-D sectional view in Fig. 1;
Wherein: 1---first side wall; 2---second side wall; The little subsides angle of 3---abutment wall; 4---base plate; 5---water surface curve; The high steep Narrow Valleys opposite bank of 6---; High steep this bank of Narrow Valleys of 7---; 8---overflow drop point scope;
Direction shown in arrow is water (flow) direction.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the present invention is further elaborated.Should be appreciated that detailed description of the invention described herein only in order to explain the present invention, be not intended to limit the present invention.
A kind of slit structure of high steep Narrow Valleys outlet structure escape works is the invention discloses as described in Fig. 1-6, form primarily of first side wall, second side wall, the little subsides angle of abutment wall and base plate, both sides abutment wall is asymmetric, described slit structure end shrinks and is provided with the little subsides angle of described abutment wall simultaneously, and the little subsides angle of abutment wall is only arranged in side; The shrinkage ratio of slit is 0.3 ~ 0.45; Fluid inertia is utilized to reduce peripheral wall height, shrink between described first side wall and described second side wall and make overflow in vertical and suitable river to diffusion dissipation, concentrated overflow top is avoided to rush opposite bank, make full use of described abutment wall little subsides angle and avoid that spallation overflow is dry pounds this bank, effective control overflow drop point scope is positioned at riverbed center range, reduces scour hole depth and inshore current velocity.Described first side wall and described second side wall are asymmetric structure.The upstream face of described first side wall is straight flange wall, and the upstream face of described second side wall is the upstream face of circular arc wall or described second side wall is straight flange wall, and the upstream face of described first side wall is circular arc wall; Described first side wall and described second side coping are straight slope or slope or folded slope shape, and described first side wall and described second side coping elevation are lower than water surface curve; The end of described first side wall and described second side wall aligns or is staggeredly arranged.Described circular arc wall is the circular arc wall of large radius.The circular arc wall of described circular arc wall to be arc radius be more than 30m.Described abutment wall little subsides angle is arranged in wall side, described first side or is arranged in wall side, described second side.Described abutment wall little subsides angle is tangent is arranged in wall downstream, described first side or wall downstream, described second side.Described abutment wall little subsides angle is short circular arc wall or the straight flange wall of small radius.When described abutment wall little subsides angle is short circular arc wall, its arc radius is 2m ~ 5.5m.Described base plate is the negative slope of flat slope or the angle of depression≤-10 °.
Further illustrate by reference to the accompanying drawings for certain the large hydropower station engineering that have employed technical solution of the present invention below:
Certain large hydropower station engineering, Dam Site belongs to the high mountain gorge landform of profoundly cutting, and bed elevation is 2202m ~ 2206m, dry season river face width 10m ~ 30m, the long 219.9m of rockfill dam with asphalt concrete core dam crest, maximum height of dam 171.2m, the ratio of width to height is 1.28.Left bank is nearly upright high slope cliff, and average grade is more than 70 °, and right bank is the folded slope landform that two walls press from both sides a slope, average grade about 45 °, section " V " font that symmetrically property is poor.Dam site exposure limestone is based on top layer weathering, and joint fissure is comparatively grown, and the off-load degree of depth is comparatively large, and side slope general stability is better, and the rock mass affected by tomography is more broken.The thick about 30m of Riverbed, is mainly sand boulder and cobble folder erratic boulder and shale.Check flood warehouse-in peak flood flow is 2010m
3/ s, design flood warehouse-in peak flood flow 1570m
3/ s, flood discharging tunnel and tunnel-spillway associating flood discharge is arranged at right bank, if under let out current top-lashed action opposite bank or dryly pound this bank or high flow rate current scour bank slope may cause two sides rock mass local buckling, wash away dell may affect base of dam stablize, therefore, have employed the slit structure of the steep Narrow Valleys outlet structure escape works of height of the present invention to solve an aforementioned techniques difficult problem.
As shown in Fig. 1-3, the slit structure of flood discharging tunnel is made up of first side wall 1, second side wall 2, the little subsides angle 3 of abutment wall and base plate 4.Choose bank input elevation 2236.9m, wide 5.8m, outlet elevation 2235.5m, wide 2.3m, shrinkage ratio is 0.4.First side wall 1 is straight flange wall, and wall top is slope, import wall height 6.1m, outlet wall height 12m.Second side wall 2 arc radius is 40m, wall top level, import wall height 6.1m, outlet wall height 7.4m.Along the little subsides angle 3 of abutment wall of first side wall 1 arranged downstream one segment length 1.8m arc radius 3m, crest level is 2245.6m.-4.6 °, the base plate angle of depression.Check flood operating mode flood discharging tunnel discharge 774m
3/ s, chooses bank admission section mean flow rate 29.9m
3/ s, first side wall 1 and second side wall 2 depth of water are 5.4m, outlet first side wall 1 depth of water is 13.7m, second side wall 2 depth of water is 13.2m, water surface curve 5 is higher than both sides abutment wall, choose overflow in adfluxion and do not push up steep Narrow Valleys opposite bank 6 of leaping high, spallation overflow is not dry pounds high steep this bank of Narrow Valleys 7, overflow drop point scope 8 is positioned at center, riverbed, 65m is about to the scope of pulling open along river, overflow inner edge is maximum chooses apart from 40m, outer rim is maximum chooses apart from 101m, punching hole dark 10.7m, inshore current velocity 0.5m/s ~ 4.1m/s.
As shown in Fig. 4-6, the slit structure of tunnel-spillway is made up of first side wall 1, second side wall 2, the little subsides angle 3 of abutment wall and base plate 4.Choose bank input elevation 2266.9m, wide 8m, outlet elevation 2265m, wide 2.8m, shrinkage ratio is 0.35; First side wall 1 is straight flange wall, and wall top is slope, import wall height 6.3m, outlet wall height 12.1m; Second side wall 2 arc radius is 72m, and wall top is slope, import wall height 6.3m, outlet wall height 15.1m; Along the little subsides angle 3 of abutment wall of second side wall 2 arranged downstream one segment length 2.5m arc radius 4.5m, crest level is 2272.9m;-4.8 °, the base plate angle of depression.Hydraulic model test shows, check flood operating mode tunnel-spillway discharge 1011m
3/ s, chooses bank admission section mean flow rate 28.3m
3/ s, first side wall 1 and second side wall 2 depth of water are 5.3m, outlet first side wall 1 depth of water is 12.3m, second side wall 2 depth of water is 18.4m, water surface curve 5 is higher than both sides abutment wall, choose overflow in adfluxion and do not push up steep Narrow Valleys opposite bank 6 of leaping high, spallation overflow is not dry pounds high steep this bank of Narrow Valleys 7, overflow drop point scope 8 is positioned at center, riverbed, 82m is about to the scope of pulling open along river, overflow inner edge is maximum chooses apart from 62m, outer rim is maximum chooses apart from 106m, punching hole dark 14.4m, inshore current velocity 0.5m/s ~ 5.7m/s.
By adopting technique scheme disclosed by the invention, obtain effect useful as follows:
By rationally arranging the slit structure of outlet structure escape works, fluid inertia is utilized to reduce peripheral wall height, make overflow in vertical and suitable river to fully pulling open diffusion dissipation, improve aerial energy dissipation rate, avoid that concentrated overflow top rushes opposite bank, spallation overflow is dry pounds this bank, overflow drop point scope is positioned at center, riverbed, effectively reduces scour hole depth and inshore current velocity, thus greatly reduces the requirement of shelter to bank slope and basis, riverbed.The present invention takes full advantage of the feature of Slit-type Bucket Jets spatial dispersion energy dissipating, simplify energy-dissipating structure and the bank slope protection measure of high steep Narrow Valleys outlet structure escape works, alleviate the impact on ecological environment and nodal region bank slope and destruction, reduce engineering quantity and construction investment, obtain good Social benefit and economic benefit, there is directive significance and dissemination widely.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.
Claims (7)
1. a slit structure for high steep Narrow Valleys outlet structure escape works, is characterized in that, comprising: the little subsides angle of first side wall, second side wall, abutment wall and base plate; Described slit structure end shrinks and is provided with the little subsides angle of described abutment wall simultaneously; The shrinkage ratio of slit is 0.3 ~ 0.45; Shrink between described first side wall and described second side wall and make overflow in vertical and suitable river to diffusion dissipation, described abutment wall little subsides angle prevents that spallation overflow is dry pounds this bank; Described slit structure control overflow drop point scope is positioned at riverbed center range;
The upstream face that the upstream face that the upstream face of described first side wall is second side wall described in straight flange wall is circular arc wall or described second side wall for the upstream face of first side wall described in straight flange wall be circular arc wall; Described first side wall and described second side coping are straight slope or slope or folded slope shape, and described first side wall and described second side coping elevation are lower than water surface curve; The end of described first side wall and described second side wall aligns or is staggeredly arranged.
2. the slit structure of the steep Narrow Valleys outlet structure escape works of height according to claim 1, is characterized in that: described first side wall and described second side wall are asymmetric structure.
3. the slit structure of the steep Narrow Valleys outlet structure escape works of height according to claim 1, is characterized in that: described circular arc wall is the circular arc wall of large radius; The circular arc wall of the circular arc wall of described large radius to be arc radius be more than 30m.
4. the slit structure of the steep Narrow Valleys outlet structure escape works of height according to claim 1, is characterized in that: described abutment wall little subsides angle is arranged in wall side, described first side or is arranged in wall side, described second side.
5. the slit structure of the steep Narrow Valleys outlet structure escape works of height according to claim 1, is characterized in that: described abutment wall little subsides angle is tangent is arranged in wall downstream, described first side or wall downstream, described second side.
6. the slit structure of the steep Narrow Valleys outlet structure escape works of height according to claim 1, is characterized in that: described abutment wall little subsides angle is short circular arc wall or the straight flange wall of small radius; The short circular arc wall of described small radius is arc radius is 2m ~ 5.5m, upstream side wall higher primary school in described first side wall or described second side wall end height 5/6ths and downstream side wall high be zero circular arc wall.
7. the slit structure of the steep Narrow Valleys outlet structure escape works of height according to claim 1, is characterized in that: described base plate is the negative slope of flat slope or the angle of depression≤-10 °.
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| CN104563067A (en) * | 2014-12-17 | 2015-04-29 | 河海大学 | Method for eliminating deviation of water jet of water tongue shock wave of slot sill and auto-correcting deviation slot sill |
| CN104594310A (en) * | 2014-12-17 | 2015-05-06 | 河海大学 | Control method of flow direction of slot sill nappe shock wave streams and slot sill |
| CN106894399B (en) * | 2017-04-19 | 2022-05-13 | 中国水利水电科学研究院 | Structure and method for adjusting flood discharge water flow distribution |
| CN109457675A (en) * | 2018-10-26 | 2019-03-12 | 杨凌职业技术学院 | A kind of bottom aeration contraction type for water discharging structure energy dissipating chooses bank structure |
| CN109706899A (en) * | 2018-11-21 | 2019-05-03 | 中国电建集团成都勘测设计研究院有限公司 | Chamfer skew bucket structure |
| CN111691376A (en) * | 2020-05-09 | 2020-09-22 | 兰州理工大学 | Incompletely-transparent bottom plate contraction type energy dissipater and energy dissipation method |
| CN111893963A (en) * | 2020-06-23 | 2020-11-06 | 中国电建集团贵阳勘测设计研究院有限公司 | Low limit wall pastes triangle body contraction type flip bucket |
| CN112095554B (en) * | 2020-08-26 | 2021-06-22 | 四川大学 | Combined type lifting and falling flow bucket suitable for narrow and deep river valley |
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| SU1262000A1 (en) * | 1984-12-21 | 1986-10-07 | Всесоюзный Государственный Ордена Трудового Красного Знамени Головной Проектно-Изыскательский И Научно-Исследовательский Институт По Переброске И Распределению Вод Северных И Сибирских Рек Им.Е.Е.Алексеевского "Союзгипроводхоз" | Arrangement for damping the energy of stream in water spillway structure |
| CN2915940Y (en) * | 2006-06-12 | 2007-06-27 | 河海大学 | Curved aerated chute |
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| 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 |
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