CN204139139U - Flood discharge absorption basin structure - Google Patents
Flood discharge absorption basin structure Download PDFInfo
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- CN204139139U CN204139139U CN201420580736.6U CN201420580736U CN204139139U CN 204139139 U CN204139139 U CN 204139139U CN 201420580736 U CN201420580736 U CN 201420580736U CN 204139139 U CN204139139 U CN 204139139U
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Abstract
The utility model discloses the shorter and water inlet section place of a kind of protection-apron by the less flood discharge absorption basin structure of cataract action power, comprise water inlet section, pond body and delivery port section; The front and back end of described water inlet section is respectively into water oral area and water inlet bottleneck throat, and the width of described water inlet oral area is narrower than the width of water inlet bottleneck throat; The bottom of described water inlet section is provided with that the stairstepping be made up of at least two steps is multistage falls bank; Be provided with in the body of described pond and choose bank; The water inlet bottleneck throat of described water inlet section and one end of pond body are connected as a single entity, and the other end of institute delivery port Duan Yuchi body is connected as a single entity.Design is widened in the gradual change of water inlet section, both can reduce torrent to the impact force of water inlet section sidewall by mitigation torrent, and can increase absorption basin volume again when protection-apron elevation is certain; The multistage bank that falls reduces torrent hydraulic jump drop, decreases the erosion of torrent to absorption basin; Choose the effect of energy dissipation that bank further increases absorption basin, relatively shorten the length of absorption basin protection-apron, be beneficial to saving engineering cost.
Description
Technical field
The utility model belongs to hydraulic engineering field, is specifically related to a kind of flood discharge absorption basin structure.
Background technology
In the process of letting out under torrent, effective dissipation is carried out in huge energy demand, with the inflow downstream river course that the torrent let out under enabling upstream is safe, safe.Absorption basin is that a kind of torrent released by outlet structure escape works by hydraulic jump changes unhurried current into, eliminates the energy-dissipating installation of torrent kinetic energy.Absorption basin is generally arranged on the outlet of the outlet structure escape works such as flood discharging tunnel, flood spillway or gate dam.
At present, absorption basin mainly contains following three kinds: the first be by reduce that protection-apron elevation formed in order to strengthen Tailwater Depth, let out the descending manner absorption basin that torrent produces underflow type hydraulic jump in pond under impelling; The second is the buffle sill formula absorption basin formed by arranging buffle sill at apron end, and this absorption basin is used for hydraulic jump degree of flooding not enough or excavation absorption basin and the situation such as has any problem; The third is the composite type absorption basin not only reducing protection-apron height but also arrange buffle sill and formed.But the protection-apron of these three kinds of absorption basins is still longer, earthwork evacuation amount and concrete square consumption are all comparatively large, and construction costs is higher; In addition, upper pond level is large to the jump drop of first place section of absorption basin water inlet, and when torrent enters absorption basin, kinetic head is comparatively large, also very large to the active force bottom absorption basin water inlet section, both easy erosion absorption basin, and effect of energy dissipation is undesirable again; And when the hydraulic jump of outlet structure escape works outlet is unstable, torrent is comparatively large to the impact force of the water inlet section sidewall of absorption basin, jeopardizes building safety, and likely floods the formation of absorption basin water inlet section, affects flood discharge.
Utility model content
The technical problems to be solved in the utility model is to provide the shorter and water inlet section place of a kind of protection-apron by the less flood discharge absorption basin structure of cataract action power.
The utility model solves the technical scheme that its technical problem adopts: flood discharge absorption basin structure, comprises water inlet section, pond body and delivery port section; The front and back end of described water inlet section is respectively into water oral area and water inlet bottleneck throat, and the width of described water inlet oral area is narrower than the width of water inlet bottleneck throat; The bottom of described water inlet section is provided with that the stairstepping be made up of at least two steps is multistage falls bank; Be provided with in the body of described pond and choose bank; The water inlet bottleneck throat of described water inlet section and one end of pond body are connected as a single entity, and the other end of institute delivery port Duan Yuchi body is connected as a single entity.
Further, the sidewall of described water inlet section is overlooked in "eight" shape.
Further, the bottom that bank is horizontally installed on pond body is chosen described in.
Further, described in choose bank the bottom of bottom and pond body be connected as a single entity, choose on bank and be respectively upstream face and back side along the left and right sides of water (flow) direction.
Further, stating the cross section choosing bank described in is triangle.
Further, the angle between the base plane of described upstream face and pond body chooses angle a for choosing bank, described in choose bank to choose angle a be 10 ° ~ 40 °.
Further, described upstream face and back side are mutually vertical.
Further, one end place described pond body is connected with delivery port section is also provided with second and chooses bank.
Further, described delivery port section is provided with at least one tooth bank.
Further, described tooth bank is at least two and is laterally disposed side by side in delivery port section.
The beneficial effects of the utility model are: design is widened in the gradual change of absorption basin water inlet section, both can mitigation torrent, reduce torrent to the impact force of water inlet section sidewall, absorption basin volume can be increased again when protection-apron elevation is certain, the range of flow adding underflow width is beneficial to energy dissipating, avoid simultaneously hydraulic jump unstable time absorption basin flooded by torrent; Multistagely fall the drop that bank reduces torrent hydraulic jump, effectively improve pressure characteristic, decrease the erosion of torrent to absorption basin, improve the life-span of absorption basin; Torrent falls energy dissipating on multiple step, improves the energy dissipation rate of absorption basin; The bank of choosing be arranged in the body of pond has the effect of choosing stream, further increases the effect of energy dissipation of absorption basin, relatively shortens the length of absorption basin protection-apron, and earthwork evacuation amount is also relative with concrete square consumption to be reduced, and has saved engineering cost.Choose and take up room less in pond body that bank is horizontally installed on absorption basin, effect of energy dissipation is better, and little by landform, geological conditions restriction.Upstream face has flip trajectory bucket effect, and back side has eddy flow effect of energy dissipation.Cross section is that triangular flip bank combines the composite energy dissipation modes such as disspation through hydraudic jimp, flip trajectory bucket and eddy flow energy dissipating, and make fluidised form better, effect of energy dissipation is best.Choose bank and choose angle a when getting 10 ° ~ 40 °, can ensure to choose apart from far away as far as possible and scour hole is not dark.Second chooses bank can flip trajectory bucket again, and can coordinate energy dissipating with delivery port section sidewall.Through the last energy dissipating of tooth bank, torrent changed into unhurried current can be safe, safe inflow downstream river course; The tooth bank be arranged side by side can flow-blocking damping, and dredges current, makes its fluidised form better.
Accompanying drawing explanation
Fig. 1 is plan structure schematic diagram of the present utility model;
Fig. 2 is the cross-sectional view cut open along A-A line in Fig. 1;
Fig. 3 is the partial enlarged drawing at I place in Fig. 2;
Be labeled as in figure: water inlet section 1, water inlet oral area 11, water inlet bottleneck throat 12, multistagely fall bank 13, step 131, pond body 2, choose bank 21, upstream face 211, back side 212, second choose bank 22, delivery port section 3 and tooth bank 31.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further described.
As depicted in figs. 1 and 2, flood discharge absorption basin structure, comprises water inlet section 1, pond body 2 and delivery port section 3; The front and back end of described water inlet section 1 is respectively into water oral area 11 and water inlet bottleneck throat 12, and the width of described water inlet oral area 11 is narrower than the width of water inlet bottleneck throat 12; The bottom of described water inlet section 1 is provided with that the stairstepping be made up of at least two steps 131 is multistage falls bank 13; Be provided with in described pond body 2 and choose bank 21; The water inlet bottleneck throat 12 of described water inlet section 1 is connected as a single entity with one end of pond body 2, and institute's delivery port section 3 is connected as a single entity with the other end of pond body 2.
Wherein, water inlet section 1 widens design for gradual change, the side wall surface of water inlet section 1 can be that the structures such as arcwall face, warp surface, aliform make the width of its oral area 11 of intaking narrower than the width of water inlet bottleneck throat 12, this structure increases the area of absorption basin horizontal section, make the volume of absorption basin larger when protection-apron elevation is certain, design is widened in gradual change simultaneously makes the sidewall of water inlet section 1 have certain thin stream effect, reduces the impact force of torrent to water inlet section sidewall simultaneously.Form multistage step 131 quantity of falling bank 13 to be generally decided according to the actual requirements, the quantity of usual step 131 is 3 ~ 5, the multistage drop falling the hydraulic jump that bank 13 makes torrent fall reduces, the impact force that absorption basin unit area is subject to reduces, avoid the erosion of torrent, improve the life-span of absorption basin, simultaneously on multiple step 131, fall energy dissipating more for torrent.Choose the effect that bank 21 has flip trajectory bucket, its cross section is generally trapezoidal or triangle, and usually choosing bank 21 is the bottoms being arranged on pond body 2; Choose the effect of energy dissipation that bank 21 further increases absorption basin, compared with existing absorption basin structure, during same effect of energy dissipation, shorten the length of absorption basin protection-apron, and during same protection-apron length, effect of energy dissipation is better.
As can be seen from Figure 1, the sidewall of described water inlet section 1 is overlooked in "eight" shape; Angle between two sidewalls of water inlet section 1 is generally 10 ° ~ 30 °.
Concrete, described in choose the bottom that bank 21 is horizontally installed on pond body 2, as shown in Figure 1, 2; Choosing bank 21 horizontally set, to take space in pond body 2 less, and effect of energy dissipation is better, and little by landform, geological conditions restriction.
As shown in Figures 2 and 3, described in choose bank 21 the bottom of bottom and pond body 2 be connected as a single entity, choose on bank 21 and be respectively upstream face 211 and back side 212 along the left and right sides of water (flow) direction; Upstream face 211 has flip trajectory bucket effect, and back side 212 has can make mighty torrent form eddy flow and then energy dissipating.Concrete, described in choose bank 21 cross section be triangle.
Concrete, the angle between described upstream face 211 and the base plane of pond body 2 chooses angle a for choosing bank, as shown in Figure 3; Draw by experiment when choosing bank to choose angle a being 10 ° ~ 40 °, choose the choosing apart from far away as far as possible and scour hole is dark of bank 21 pairs of torrent, choose angle a be preferably 10 ° ~ 40 ° so choose bank.Described upstream face 211 is mutually vertical with back side 212.
In order to promote the effect of energy dissipation of absorption basin further, one end place that described pond body 2 is connected with delivery port section 3 is also provided with second and chooses bank 22, as shown in Figure 2; Second chooses bank 22 not only has flip trajectory bucket effect, and is chosen by second torrent that bank 22 provokes and can impact energy dissipating on the sidewall that connects with delivery port section 3 at pond body 2.
Composition graphs 1 and Fig. 2 it can also be seen that, described delivery port section 3 is provided with at least one tooth bank 31.Concrete, described tooth bank 31 is at least two and is laterally disposed side by side in delivery port section 3.Through the last energy dissipating of tooth bank 31, torrent changed into unhurried current can be safe, safe inflow downstream river course; And current can be dredged in the gap between adjacent teeth bank 31, make its fluidised form better.
Embodiment
Flood discharge absorption basin, is divided into water inlet section 1, pond body 2 and delivery port section 3 successively; The width of water inlet section 1 front end water inlet oral area 11 is 15m, and the width of water inlet section 1 rear end water inlet bottleneck throat 12 is 30m, and the angle between two side wall surfaces of water inlet section 1 is 18.14 °; The bottom of water inlet section 1 is provided with that the stairstepping be made up of three steps 131 is multistage falls bank 13, and the multistage bank 13 that falls is and the structure of bottom one of water inlet section 1; Being horizontally arranged with cross section in pond body 2 is leg-of-muttonly choose bank 21, and the upstream face 211 choosing bank 21 is mutually vertical with back side 212, and choosing bank, to choose angle a be 10.01 °; One end place that pond body 2 is connected with delivery port section 3 is provided with second and chooses bank 22; Delivery port section 3 is provided with the tooth bank 31 that four transverse directions are arranged side by side.According to engineering experience, in order to prevent cavitation erosion, building flow cavitation number generally should be greater than 0.3, adopts the flow cavitation number at each position of build to be all greater than 0.3.
Energy dissipation: after the torrent gone out when flood releasing structure outlet jet enters absorption basin from water inlet oral area 11, bank 13 falls energy dissipating multistage falling and enters in pond body 2 under the guide functions of the gradually broad side walls of water inlet section 1; Torrent, through choosing reflection and turbulent fluctuation and the backflow in pond body 2 after choosing stream of upstream face 211 on bank 21, forms eddy flow and then energy dissipating at back side 212 place torrent, substantially increases energy dissipation rate; Torrent impacts energy dissipating further on the sidewall that connects with delivery port section 3 at pond body 2 again after second chooses bank 22 flip trajectory bucket; Finally, a torrent part is stopped energy dissipating by tooth bank 31, and a part flows out from the gap between two adjacent teeth banks 31 and delivery port section 3 top and becomes unhurried current, flows into lower fluid stream channel.
Energy dissipating flow velocity is tested
Under hundred year flood operating mode, mighty torrent is 22.91m/s from the flow velocity that enters of water inlet oral area 11, and after multistagely falling bank 13, choosing bank 21, flow velocity is reduced to 9.48m/s, then the flow velocity flowed out from exit after second chooses bank 22, tooth bank 31 is 7.95m/s; In addition, the transverse flow speed distribution of each section is relatively more even, and vertical characteristics remains middle and upper part flow velocity comparatively greatly, and underflow speed is less.
For once-in-a-century flood, conventional absorption basin energy dissipating efficiency is below 20%; And this absorption basin structure of the program is multistagely fallen bank 13 owing to have employed, is chosen bank 21, second choose the energy dissipater such as bank 22, tooth bank 31 after, energy dissipation rate is about 42%, is more than doubled than conventional absorption basin; For the flood that Two decades years one is met, this absorption basin structure energy dissipation rate is increased to about 56%.
Originally be the outlet that utility model is generally used for the outlet structure escape works such as flood discharging tunnel, flood spillway or gate dam, especially for the flood discharge hole outlet of large discharge, high water head, high flow rate.
Claims (10)
1. flood discharge absorption basin structure, comprises water inlet section (1), pond body (2) and delivery port section (3); It is characterized in that: the front and back end of described water inlet section (1) is respectively into water oral area (11) and water inlet bottleneck throat (12), and the width of described water inlet oral area (11) is narrower than the width of water inlet bottleneck throat (12); The bottom of described water inlet section (1) is provided with that the stairstepping be made up of at least two steps (131) is multistage falls bank (13); Be provided with in described pond body (2) and choose bank (21); The water inlet bottleneck throat (12) of described water inlet section (1) and one end of pond body (2) are connected as a single entity, and institute's delivery port section (3) is connected as a single entity with the other end of pond body (2).
2. flood discharge absorption basin structure as claimed in claim 1, is characterized in that: the sidewall of described water inlet section (1) is overlooked in "eight" shape.
3. flood discharge absorption basin structure as claimed in claim 1, is characterized in that: described in choose the bottom that bank (21) is horizontally installed on pond body (2).
4. flood discharge absorption basin structure as claimed in claim 3, it is characterized in that: described in choose bank (21) the bottom of bottom and pond body (2) be connected as a single entity, choose on bank (21) and be respectively upstream face (211) and back side (212) along the left and right sides of water (flow) direction.
5. flood discharge absorption basin structure as claimed in claim 4, is characterized in that: described in choose bank (21) cross section be triangle.
6. the flood discharge absorption basin structure as described in claim 4 or 5, is characterized in that: the angle between the base plane of described upstream face (211) and pond body (2) chooses angle a for choosing bank, described in choose bank to choose angle a be 10 ° ~ 40 °.
7. flood discharge absorption basin structure as claimed in claim 6, is characterized in that: described upstream face (211) is mutually vertical with back side (212).
8. the flood discharge absorption basin structure as described in claim 1,2,3,4,5 or 7, is characterized in that: the upper one end place be connected with delivery port section (3), described pond body (2) is also provided with second and chooses bank (22).
9. the flood discharge absorption basin structure as described in claim 1,2,3,4,5 or 7, is characterized in that: described delivery port section (3) is provided with at least one tooth bank (31).
10. flood discharge absorption basin structure as claimed in claim 9, is characterized in that: described tooth bank (31) is at least two and is laterally disposed side by side in delivery port section (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420580736.6U CN204139139U (en) | 2014-10-09 | 2014-10-09 | Flood discharge absorption basin structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420580736.6U CN204139139U (en) | 2014-10-09 | 2014-10-09 | Flood discharge absorption basin structure |
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| CN204139139U true CN204139139U (en) | 2015-02-04 |
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| CN201420580736.6U Active CN204139139U (en) | 2014-10-09 | 2014-10-09 | Flood discharge absorption basin structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555088A (en) * | 2019-01-14 | 2019-04-02 | 中国水利水电科学研究院 | A kind of anti-whirlpool device of rectification |
| CN110616690A (en) * | 2019-09-05 | 2019-12-27 | 四川大学 | Energy dissipation pool with torrent dispersing flip bucket |
| CN113718727A (en) * | 2021-09-07 | 2021-11-30 | 中国电建集团昆明勘测设计研究院有限公司 | Sudden expansion and falling sill absorption basin suitable for large single wide discharge of high water head |
-
2014
- 2014-10-09 CN CN201420580736.6U patent/CN204139139U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109555088A (en) * | 2019-01-14 | 2019-04-02 | 中国水利水电科学研究院 | A kind of anti-whirlpool device of rectification |
| CN109555088B (en) * | 2019-01-14 | 2023-11-07 | 中国水利水电科学研究院 | Rectifying vortex-preventing device |
| CN110616690A (en) * | 2019-09-05 | 2019-12-27 | 四川大学 | Energy dissipation pool with torrent dispersing flip bucket |
| CN113718727A (en) * | 2021-09-07 | 2021-11-30 | 中国电建集团昆明勘测设计研究院有限公司 | Sudden expansion and falling sill absorption basin suitable for large single wide discharge of high water head |
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