CN108203962B - Curtain dam type temperature differential gravity flow blocking device - Google Patents
Curtain dam type temperature differential gravity flow blocking device Download PDFInfo
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- CN108203962B CN108203962B CN201810131808.1A CN201810131808A CN108203962B CN 108203962 B CN108203962 B CN 108203962B CN 201810131808 A CN201810131808 A CN 201810131808A CN 108203962 B CN108203962 B CN 108203962B
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- temperature differential
- gravity flow
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 56
- 230000005484 gravity Effects 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 238000004873 anchoring Methods 0.000 claims abstract description 3
- 239000004575 stone Substances 0.000 claims description 9
- 239000011241 protective layer Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 239000000725 suspension Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 241000251468 Actinopterygii Species 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 229920002457 flexible plastic Polymers 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 244000213382 Nymphaea lotus Species 0.000 description 1
- 235000010710 Nymphaea lotus Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
-
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Revetment (AREA)
Abstract
The invention discloses a curtain dam type temperature differential gravity flow blocking device, which comprises two sliding grooves arranged on two sides of the upstream of a water intake of a power station; pulleys are arranged in the two sliding grooves; the two pulleys are fixedly connected with the two ends of the main cable perpendicular to the water flow direction respectively; the main cable is fixedly connected with the anchoring system through a plurality of longitudinal inhaul cables; the longitudinal inhaul cables are fixedly connected with the curtain, and the top end of the curtain is lower than the water surface at the upstream of the water intake of the hydropower station; the curtain bottom and rigidity stop structure top fixed connection. The invention can bear huge load caused by temperature differential gravity flow and adapt to large-amplitude water level change.
Description
Technical Field
The invention relates to the field of water conservancy and hydropower engineering, in particular to a curtain dam type temperature differential gravity flow blocking device.
Background
The differential gravity flow refers to a flow generated by a difference in specific gravity between two or more kinds of fluid which are not very different in specific gravity and can be mixed in a gravitational field. The temperature differential gravity flow belongs to one of differential gravity flows. In a high dam, water temperature layering phenomenon and water temperature different gravity flow exist, namely, the high-temperature water is light in density and is positioned on the upper layer; the low-temperature water has heavy density and is positioned at the lower layer.
In order to relieve adverse effects of low-temperature water discharged from a reservoir in spring and summer on the ecological environment at the downstream of a dam, a blocking device is arranged at the upstream of a water intake of a power plant to block low-temperature water at the lower layer, so that the low-temperature water is prevented from entering the water intake of the power plant, and the purpose of discharging high-temperature water at the surface layer is achieved.
For the high dam, the water area of the reservoir area is wide and the cross-sectional area is large. Accordingly, the area of the blocking device is tens of thousands or even millions of square meters. On the other hand, after the blocking device is built, only water with a lighter surface layer can enter the back of the device from the top of the device and then enter the water intake. Thus, the weight of the water bodies on the front side and the back side of the blocking device can be obviously different, and the blocking device can bear huge hydrostatic pressure. Under the action of the two aspects, the pressure of the blocking device can reach several kilopascals, and the pressure born by the whole device can reach several thousands of tons or even tens of thousands of tons.
The existing blocking device capable of bearing such large pressure, such as a dam, is high in manufacturing cost, long in construction period, huge in construction cost, fixed in top elevation, incapable of changing along with the water level of the dam, and limited in water temperature improvement effect.
On the other hand, for large-scale blocking devices with the top elevation changing along with the water level, most of the devices are flexible, and the top is provided with a main body stress suspension rope.
The cross section of the front section of the dam is hundreds of meters, even thousands of meters. When the blocking device is built, the span of the main body stressed suspension cable above the blocking device is equivalent to the river width of the section, and the blocking device belongs to a large-span suspension cable structure and bears huge load.
Because the main body stress suspension cable is fixed at a certain elevation on two banks, the swing amplitude of the main body stress suspension cable is limited, and the main body stress suspension cable can only adapt to water level amplitude of 10-20 m. For high dam vaults, the fluctuation of the water level in the storage area is frequent, and the water level amplitude can exceed 50m in one year. When the storage area runs at a low water level, the components of the blocking device close to the two banks are pulled up by the main body stressed suspension ropes to separate from the water surface and are suspended in the air. The load of the main body stressed suspension cable is obviously increased, and the phenomenon of local stress concentration can be caused, so that the safety of the blocking structure is endangered.
In addition, for the existing flexible blocking device, in order to relieve the huge pressure caused by the abnormal temperature heavy flow, a small-area low-temperature water passing channel must be reserved at the bottom for reducing the overall load of the device. However, a small amount of low-temperature water can enter the power station factory building, and the improvement effect of the blocking device is reduced.
Therefore, no effective solution has been proposed in the industry for the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing the curtain dam type temperature differential gravity flow blocking device which can bear huge load caused by temperature differential gravity flow and adapt to large-amplitude water level change.
In order to solve the technical problems, the invention adopts the following technical scheme: a curtain dam type temperature differential gravity flow blocking device comprises two sliding grooves arranged on two sides of the upstream of a water intake of a power station; pulleys are arranged in the two sliding grooves; the two pulleys are fixedly connected with the two ends of the main cable perpendicular to the water flow direction respectively; the main cable is fixedly connected with the anchoring system through a plurality of longitudinal inhaul cables; the longitudinal inhaul cables are fixedly connected with the curtain, and the top end of the curtain is lower than the water surface at the upstream of the water intake of the hydropower station; the curtain bottom and rigidity stop structure top fixed connection.
The rigid blocking structure comprises a riprap masonry; and a core wall is arranged in the polished stone pile body. The core wall is used for seepage prevention.
The tops of the two sliding grooves are not lower than the reservoir check flood control water level, and the bottoms of the two sliding grooves are not higher than the reservoir dead water level. The method is suitable for reservoir water level amplitude to the greatest extent.
The main cable is coated with a protective layer, and the protective layer is made of buoyancy materials. The main cable can resist the dead weight and float on the water surface.
The top end of the curtain is fixedly connected with the upper line, and the side face is fixedly connected with the side gravity anchor chain. The upper line is used for stabilizing the curtain shape; the side gravity anchor chains are used for stabilizing curtain shape and reducing side gap water leakage.
The top elevation of the rigid blocking structure does not exceed the difference between the dead water level of the reservoir and the top overflow height of the blocking device; the top overflow height of the blocking device is the difference between the top elevation of the curtain and the elevation of the water surface. Preventing the blocking height from exceeding a set value and affecting the swimming layer of fish.
Compared with the prior art, the invention has the following beneficial effects: the invention can bear huge load caused by temperature differential gravity flow and adapt to large-amplitude water level change.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
fig. 2 is a cross-sectional view taken along the A-A plane of fig. 1.
Detailed Description
When the blocking device is built in the reservoir, the lower low temperature of the reservoir area is blocked, only the surface high temperature water enters the front pool (the blocking device reaches the water intake area of the power station), and the water temperature of the front pool is higher than that of the reservoir area. Because the density of water is reduced along with the temperature rise after the temperature is higher than 4 ℃, the water weight of the reservoir area is heavier than that of the forehearth, the blocking device bears huge temperature differential gravity flow load, and the pressure born by the whole device is linearly increased after the water depth is lower than the curtain top elevation, namely the deeper the water depth is, the greater the load is.
The flexible structure can change along with the water level, can not bear larger load, and has lower manufacturing cost; the rigid structure can bear huge load and cannot change along with the water level. The cost is proportional to the volume of the earth and stone, and is more than three times higher than the blocking height, so the cost is generally higher than that of a flexible structure. In addition, for the high dam, the high dam is built on the V-shaped river valley, the bottom of the river valley is narrow, and the high soil and stone amount can be obtained by the small soil and stone amount.
Considering the three reasons and the characteristic that the load of the curtain dam type temperature differential gravity flow blocking device increases along with the increase of the water depth, the invention provides the water temperature differential gravity flow blocking device with rigid-flexible combination. The load in the deep water area is large and is borne by the rigid blocking system; the shallow water area has small load and large water level fluctuation, and is born by the flexible blocking system.
As shown in fig. 1 and 2, the device mainly comprises a cable system, a flexible blocking system and a rigid blocking system.
The cable system comprises a chute (left-bank chute 12, right-bank chute 15), pulleys (left-bank pulley 13, right-bank pulley 14) and a main cable 1. The left bank chute 12 and the right bank chute 15 are arranged on two banks, the top elevation is positioned at the reservoir check flood control water level, the bottom elevation is positioned at the reservoir dead water level, and the left bank chute and the right bank chute are made of reinforced concrete. Pulleys are arranged in the two sliding grooves, and the material is Q345B. The two ends of the main cable are fixed on the pulleys and can change along with the water level. The main cable is made of high-strength steel wire bundles, and is covered with a buoyancy protection layer, so that the main cable resists dead weight and floats on the water surface. The left bank chute 12 and the right bank chute 15 are respectively fixed on two banks through a left bank chute pile foundation 11 and a right bank chute pile foundation 16.
The flexible blocking system mainly comprises a series of longitudinal guy ropes 2, a top line 3, a gravity anchor chain, a curtain 4 and a ground anchor. The longitudinal guy rope is made of steel rope and is covered with flexible protective layer. The top end of the anchor is fixed on the main cable, the bottom end of the anchor is fixed on an earth anchor (a bottom earth anchor 5 and an edge earth anchor 8), and the earth anchor is inserted into a rigid blocking system or the earth. The curtain 4 is made of high-strength low-permeability geotechnical cloth and is fixed on a longitudinal inhaul cable. The curtain is lower than the water surface, and the difference between the water surface and the top elevation is the overflow height of the blocking device. The top of the curtain is provided with a steel strand, and the steel strand is used for stabilizing the form of the curtain; the side is provided with a gravity anchor chain (side gravity anchor chain 7) for stabilizing the curtain shape and reducing the water leakage of the side gap; the bottom is wrapped with a gravity anchor chain (bottom gravity anchor chain 6) which is embedded on top of the rigid retaining system.
The rigid blocking system mainly comprises a stone throwing pile masonry 9 and a core wall 17, wherein the stone throwing pile masonry is made of earth and stone and used for bearing load, and the core wall is built in and made of reinforced concrete and used for seepage prevention. The topography and economy of the top Gao Chengshi of the system is dependent, but does not exceed the difference between the dead water level of the reservoir and the level of the top overflow of the retaining device.
Example this example relies on the low temperature water management project of Anhui's flood river cliff power station. The reservoir of the cliff is positioned in the county of the mountain in the Liu An city of Anhui province, the reservoir river basin belongs to the northern foot of the mountain in the southwest province, the main source of the main tributary river of the Henan river bank of the Dihui province is on the flood river, the distance from the main source to the river is 189km, the dam site is positioned in the county of the mountain in the county of the large-scale village of the mountain in the white lotus, and the area of the reservoir river basin is 745km 2 Average annual runoff of 6.15 hundred million m 3 . After the reservoir stores water, the reservoir area presents obvious temperature layering phenomenon, the water temperature at the reservoir bottom is only 10.6 ℃, so that the water temperature discharged in spring and summer is lower than the water temperature under natural conditions, and the adverse effect is generated on spawning and propagation of downstream fishes. To make fish have proper spawning periodUnder the proper water temperature condition, a blocking device is needed to be built at the position about 200m upstream of the water inlet of the power station to improve the water drainage temperature of the hydropower station with the cliff.
Through numerical simulation calculation and analysis, the total load born by the blocking device is 2246t, and the bottom pressure is 1874pa at maximum.
Rigid concrete sliding grooves are formed in two sides of the section where the blocking device is located, and steel plates are adhered to the inside of the groove body. The left bank groove is 23m long, the right bank groove is 20m long, the width is 4m, and the height is 3m. A rigid pulley is arranged in the chute, the diameter is 2m, and the width is 3m.
The main cable is stretched by two bank pulleys, wherein the diameter of the high-strength steel wire bundle is 50cm, a flexible plastic protective layer is wrapped outside the main cable, foam is arranged outside the protective layer, and a Lv Zhi sheath is wrapped outside the foam. The diameter of the main cable after wrapping is 3m.
And 9 weight inhaul cables made of steel ropes are fixed on the main cable, and are wrapped with flexible plastic protective layers with the diameter of 10cm and the interval of 30m. The bottom of the inhaul cable is anchored to the earth-rock pile masonry or the earth through the earth. The curtain material is high-strength hypotonic geotechnical cloth, is fixed in vertical cable. The top of the curtain is provided with a steel strand with the diameter of 5cm; the side-wrapping gravity anchor chain is arranged on a bank slope, the diameter is 15cm, the bottom-wrapping gravity anchor chain is buried to a soil-stone pile masonry during construction, and the landfill depth is 5m.
The top elevation of the earth-rock pile masonry is 175m, and the earth-rock direction is about 10.5 ten thousand m 3 . A reinforced concrete impervious core wall is arranged in the earth-rock side pile body.
After numerical simulation calculation, the water draining temperature of the fish in the spawning period of the spring of 5 months can be increased from 17.3 ℃ to 22.8 ℃ after the blocking device is implemented. Therefore, the water discharge temperature improving effect is very good under the embodiment, and the popularization value is remarkable.
Claims (7)
1. The curtain dam type temperature differential gravity flow blocking device is characterized by comprising two sliding grooves arranged on two sides of the upstream of a water intake of a power station; pulleys are arranged in the two sliding grooves; the two pulleys are fixedly connected with the two ends of the main cable (1) perpendicular to the water flow direction respectively; the main cable (1) is fixedly connected with the anchoring system through a plurality of longitudinal inhaul cables (2); the longitudinal inhaul cables (2) are fixedly connected with the curtain (4), and the top end of the curtain (4) is lower than the water surface at the upstream of the water intake of the hydropower station; the bottom end of the curtain (4) is fixedly connected with the top of the rigid blocking structure;
the rigid blocking structure comprises a rubble pile masonry (9); and a core wall (17) is arranged in the stone throwing pile masonry (9).
2. The curtain dam type temperature differential gravity flow blocking device according to claim 1, wherein the tops of the two sliding grooves are not lower than a reservoir check flood control water level, and the bottoms of the two sliding grooves are not higher than a reservoir dead water level.
3. Curtain dam type temperature differential gravity flow blocking device according to claim 1, characterized in that the main cable (1) is covered with a protective layer.
4. The curtain-dam type temperature differential gravity flow blocking device according to claim 3, wherein the protective layer is made of buoyancy materials.
5. The curtain dam type temperature differential gravity flow blocking device according to claim 1, wherein the top end of the curtain (4) is fixedly connected with the upper line (3), and the side face is fixedly connected with the side gravity anchor chain (7).
6. Curtain-type temperature differential gravity flow blocking device according to one of claims 1 to 5, characterized in that the top elevation of the rigid blocking structure does not exceed the difference between the dead water level of the reservoir and the overflow height of the top of the blocking device; the top overflow height of the blocking device is the difference between the top elevation of the curtain (4) and the water surface elevation.
7. Curtain-type temperature differential gravity flow blocking device according to one of claims 1 to 5, characterized in that the outside of the plurality of longitudinal guys (2) is provided with a flexible protection layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810131808.1A CN108203962B (en) | 2018-02-09 | 2018-02-09 | Curtain dam type temperature differential gravity flow blocking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810131808.1A CN108203962B (en) | 2018-02-09 | 2018-02-09 | Curtain dam type temperature differential gravity flow blocking device |
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| CN108203962A CN108203962A (en) | 2018-06-26 |
| CN108203962B true CN108203962B (en) | 2023-07-25 |
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| CN201810131808.1A Active CN108203962B (en) | 2018-02-09 | 2018-02-09 | Curtain dam type temperature differential gravity flow blocking device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110904917A (en) * | 2019-12-04 | 2020-03-24 | 中国电建集团中南勘测设计研究院有限公司 | Water flow blocking device |
| CN111962460A (en) * | 2020-09-04 | 2020-11-20 | 中国长江三峡集团有限公司 | A ship blocking device that automatically rises and falls with the change of the downstream water level of a hydropower station and its use method |
| CN112818438B (en) * | 2020-12-31 | 2024-02-06 | 中国电建集团中南勘测设计研究院有限公司 | River channel model based on SWMM and scheduling simulation generalization method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07127041A (en) * | 1993-11-09 | 1995-05-16 | Masuji Oi | Inflow water separating device for dam reservoir |
| CN104846793A (en) * | 2015-06-02 | 2015-08-19 | 天津大学前沿技术研究院有限公司 | Suspended soft curtain for controlling multi-level intake of reservoir |
| CN104389297B (en) * | 2014-11-07 | 2016-02-10 | 中国电建集团中南勘测设计研究院有限公司 | A kind of device and method improving large reservoir layering water at low temperature |
| CN106638482A (en) * | 2017-02-08 | 2017-05-10 | 天津大学 | Sectional curtain water barrier structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2372825B1 (en) * | 2009-09-16 | 2012-11-30 | Técnica En Instalaciones de Fluidos, S.L. | SYSTEM AND METHOD FOR REDUCING THE WATER ENVIRONMENTAL IMPACT WATER DOWN EXTRACTED WATER FROM A HYDRAULIC DAM. |
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2018
- 2018-02-09 CN CN201810131808.1A patent/CN108203962B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07127041A (en) * | 1993-11-09 | 1995-05-16 | Masuji Oi | Inflow water separating device for dam reservoir |
| CN104389297B (en) * | 2014-11-07 | 2016-02-10 | 中国电建集团中南勘测设计研究院有限公司 | A kind of device and method improving large reservoir layering water at low temperature |
| CN104846793A (en) * | 2015-06-02 | 2015-08-19 | 天津大学前沿技术研究院有限公司 | Suspended soft curtain for controlling multi-level intake of reservoir |
| CN106638482A (en) * | 2017-02-08 | 2017-05-10 | 天津大学 | Sectional curtain water barrier structure |
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