CN211922550U - Improve power station tailrace tunnel open-full flow influence's adverse slope weir structure - Google Patents
Improve power station tailrace tunnel open-full flow influence's adverse slope weir structure Download PDFInfo
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- CN211922550U CN211922550U CN201921825548.4U CN201921825548U CN211922550U CN 211922550 U CN211922550 U CN 211922550U CN 201921825548 U CN201921825548 U CN 201921825548U CN 211922550 U CN211922550 U CN 211922550U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/30—Flood prevention; Flood or storm water management, e.g. using flood barriers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model provides an adverse slope weir structure for improving the influence of the open-full flow of a hydropower station tail water tunnel, wherein the tail water tunnel is reconstructed by a diversion tunnel, an adverse slope weir structure is arranged at the outlet of the tail water tunnel, the upstream surface of the adverse slope weir structure adopts an adverse slope streamline form, and the elevation of the adverse slope weir top is higher than the bottom plate of the tunnel outlet; the elevation of the riverbed at the downstream of the adverse slope weir is not higher than the elevation of the weir top of the adverse slope weir. The utility model discloses can avoid the bright full current of tailrace tunnel to reach the influence to water delivery system operating stability's of the harm of tunnel lining cutting structure to the engineering volume is little.
Description
Technical Field
The utility model relates to an improve adverse slope weir structure of power station tailwater tunnel open-air full flow state influence. Is suitable for the field of water conservancy and hydropower engineering.
Background
The large underground powerhouse type hydropower station saves the engineering investment, reduces the excavation rate of underground rock masses, and effectively maintains the integrity and the stability of the rock masses. The diversion tunnel is often reconstructed into a power station tail water tunnel by adopting a form of arrangement of the tail water tunnel and the diversion tunnel, such as a river luodie, a beach, a Wudongde, a rock threshold and other hydroelectric projects. Due to the engineering task requirements borne by the diversion tunnel, the elevation of the bottom plate is generally high, the height of the tail water level of the power station is influenced by flood discharge of a reservoir and power generation flow, the water level amplitude is large, and when the tail water level is low, the phenomenon of alternation of open flow and full flow in the tail water tunnel is inevitable in the transition process of the hydropower station.
The flow state of the water flow phenomenon of the alternation of the open flow and the full flow is complex, the hole is sometimes pressurized and sometimes not pressurized, and the air bag is intercepted and moves along with the water flow, and the pressure pulsation phenomenon is accompanied. The large transient pressure easily causes the structural damage of the tunnel, and simultaneously can influence the stability of the operation of the power station. In order to ensure safe and stable operation of the power generation and water delivery system building and the unit, improvement measures of the open-full flow phenomenon need to be researched and adopted. The conventional improvement method mainly comprises the steps of arranging vent holes, shortening the length of a tail water tunnel reconstructed by a diversion tunnel and arranging a tail water surge chamber to separate the tail water tunnel. The arrangement of the vent holes can effectively improve the negative pressure problem caused by the full flow, thereby reducing the influence of pulsating pressure on the building structure, but the influence range is limited, and more vent holes need to be arranged. The length of the tailrace tunnel reconstructed by the diversion tunnel is inconsistent with the purpose of reconstructing the tailrace tunnel by the diversion tunnel initially, the arrangement of the tail adjusting partition can reduce the influence of the open and full flow phenomenon on the stability of the unit, but the manufacturing cost is high, and the pressure regulating chamber cannot be arranged under the condition that the tailrace tunnel is not very long.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: aiming at the problems, the adverse slope weir structure for improving the influence of the open and full flow of the tailwater tunnel of the hydropower station is designed to avoid the damage of the open and full flow of the tailwater tunnel to the lining structure of the tunnel and the influence on the operation stability of a water delivery system, and the engineering quantity is small.
The utility model adopts the technical proposal that: the utility model provides an improve adverse slope weir structure of power station tailrace tunnel open-full flow state influence, the tailrace tunnel is rebuild by the diversion tunnel, its characterized in that: an adverse slope weir structure is arranged at the exit of the tailwater tunnel, the upstream surface of the adverse slope weir structure adopts an adverse slope streamline form, and the elevation of the adverse slope weir top is higher than the bottom plate of the tunnel exit; the elevation of the riverbed at the downstream of the adverse slope weir is not higher than the elevation of the weir top of the adverse slope weir.
Further: the adverse slope weir should be arranged at the open canal section of the tail water tunnel outlet.
Further: the elevation of the top of the adverse slope weir is not more than one third of the height of the tail water tunnel.
When the tail water level is lower, the open and full flow phenomenon can occur in the tail water tunnel reconstructed by the diversion tunnel,
the utility model discloses export at bright full-flow tailrace tunnel and set up the adverse slope weir, when the tail water level is lower, can raise the interior water level of tailrace tunnel to under preventing the changeover process operating mode, bright full-flow phenomenon propagates to the gentle slope tunnel section at diversion tunnel reconstruction section upper reaches, can effectively reduce the scope that bright full-flow phenomenon takes place, thereby alleviates its influence to tailrace tunnel lining cutting structure and unit stability.
The utility model discloses export at the tail water tunnel of the open-air full flow and set up the adverse slope weir, when the tail water level is lower, under normal electricity generation operating mode (invariable flow), the tail water tunnel export flow state is the drop, and low reaches storehouse water level does not have the influence to the flow state in the hole. In the conventional flat slope outlet scheme, the water level in the tail water tunnel is influenced by the fluctuation of the downstream tail water level, so that the flow state in the tail water tunnel and the stability of a water delivery system are influenced.
The utility model discloses set up the adverse slope weir in the export of bright full-flow tailrace tunnel, can increase tailrace connecting pipe import negative pressure extreme value, for example certain engineering is used the utility model discloses, draft tube import negative pressure extreme value increase 2.86m increases to 1.96m by original-0.9 m, and it is very obvious to improve the effect, and the norm requires the extreme value to be-8.0 m, uses the utility model discloses can effectively reduce the emergence and lift the heavy incident probability such as quick-witted.
The utility model discloses set up the adverse slope weir in the export of bright full-flow tailrace tunnel, can increase the minimum water level of surging in tailrace surge-chamber, certain engineering is used the utility model discloses, the minimum 3.94m of surging than the flat slope export scheme in tailrace surge-chamber, the minimum water level of surging in standard requirement tailrace surge-chamber is higher than impedance board 2.0m at least. Therefore, the utility model discloses can improve the minimum condition of surging in tail water surge-chamber, and then avoid tail water surge-chamber to appear the possibility of revealing the end.
The utility model discloses require the upstream and downstream riverbed elevation of adverse slope weir not be higher than the weir crest elevation can, can reduce the excavation behind the weir, save a large amount of engineering investment.
Drawings
Fig. 1 is a schematic sectional layout of a water delivery system.
FIG. 2 is a schematic sectional view of a tail water outlet reverse slope weir.
Wherein, 1, underground factory building, 2, tail water surge-chamber, 3, tail water connecting pipe, 4, tail water tunnel gentle slope section, 5, the front combination section (steep slope section) of the open full flow section, 6, the open full flow section (the tail water tunnel reconstructed by the diversion tunnel), 7, export adverse slope weir, 8, tail water tunnel bottom plate, 9, downstream riverbed, 10, the rock mass of reducing excavation behind the adverse slope weir, 11, conventional tail water tunnel export bottom plate (only schematic)
Detailed Description
Referring to the attached drawings, the headwall weir structure for improving the influence of the open-full flow state of the tailwater tunnel of the hydropower station is characterized in that the tailwater tunnel 6 is reconstructed by a diversion tunnel, an overflow weir higher than a tunnel outlet bottom plate 8 is arranged at the tail water tunnel outlet, the overflow weir is a headwall weir 7, an upstream face 70 of the overflow weir adopts a headwall streamline form, and the top elevation of the slope weir is higher than the tunnel outlet bottom plate 8. When the tail water level is lower, can take place the bright full-flow phenomenon in the tailwater tunnel 6 reconstructed by the diversion tunnel, the utility model discloses a structure can improve the influence of bright full-flow phenomenon to power station water delivery system.
The tail water tunnel outlet overflow weir adopts a reverse slope form, compared with the overflow weir of water discharge of a conventional reservoir or a sluice and the like, the reverse slope weir 7 has the opposite section structure, and the structure of the reverse slope weir is shown in figure 2. The curve of the surface of the adverse slope weir is designed according to the overflow weir body type of a hydraulic engineering design manual, and streamline is selected as much as possible to reduce head loss. When the tail water level is high, under the working condition of the transition process, forward and reverse water flows can occur on the adverse slope weir, the flow state is complex, and model tests or computational fluid dynamics simulation researches are required to be carried out.
The tailrace tunnel outlet adverse slope weir 7 is arranged at the tailrace tunnel outlet open channel section, so that the influence of overlarge head loss on the flow capacity is avoided. The height of the adverse slope weir is determined according to hydraulic model tests and transient flow numerical calculation results, the higher the elevation of the weir top is, the smaller the influence range of the open-full flow is, but the larger the influence on the generating head is, and generally the height of the adverse slope weir should not exceed one third of the height of the tail water tunnel. The elevation of the riverbed at the downstream of the adverse slope weir is not higher than the elevation of the weir top of the adverse slope weir.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art can change, add or replace the above examples within the scope of the present invention.
Claims (3)
1. The utility model provides an improve adverse slope weir structure of power station tailrace tunnel open-air full current influence, the tailrace tunnel is rebuild by the diversion tunnel, its characterized in that: an adverse slope weir (7) is arranged at the tail water tunnel outlet, the upstream surface of the adverse slope weir (7) adopts an adverse slope streamline form, and the elevation of the adverse slope weir top is higher than the tunnel outlet bottom plate (8); the elevation of the riverbed (9) at the downstream of the adverse slope weir is not higher than the elevation of the weir top of the adverse slope weir (7).
2. The adverse weir structure of claim 1 for improving the effect of the open-full flow of the tailwater tunnel of a hydropower station, wherein: the adverse slope weir (7) is arranged at the open canal section of the tail water tunnel outlet.
3. The adverse weir structure of claim 1 for improving the effect of the open-full flow of the tailwater tunnel of a hydropower station, wherein: the elevation of the top of the adverse slope weir (7) is not more than one third of the height of the tail water tunnel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921825548.4U CN211922550U (en) | 2019-10-28 | 2019-10-28 | Improve power station tailrace tunnel open-full flow influence's adverse slope weir structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921825548.4U CN211922550U (en) | 2019-10-28 | 2019-10-28 | Improve power station tailrace tunnel open-full flow influence's adverse slope weir structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110700209A (en) * | 2019-10-28 | 2020-01-17 | 中国电建集团华东勘测设计研究院有限公司 | Improve power station tailrace tunnel open-full flow influence's adverse slope weir structure |
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- 2019-10-28 CN CN201921825548.4U patent/CN211922550U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110700209A (en) * | 2019-10-28 | 2020-01-17 | 中国电建集团华东勘测设计研究院有限公司 | Improve power station tailrace tunnel open-full flow influence's adverse slope weir structure |
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