CN108104075B - Rigid water-blocking structure for reducing water leakage quantity at edge wall of lower end of water-blocking curtain wall - Google Patents
Rigid water-blocking structure for reducing water leakage quantity at edge wall of lower end of water-blocking curtain wall Download PDFInfo
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- CN108104075B CN108104075B CN201711296546.6A CN201711296546A CN108104075B CN 108104075 B CN108104075 B CN 108104075B CN 201711296546 A CN201711296546 A CN 201711296546A CN 108104075 B CN108104075 B CN 108104075B
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- water
- water blocking
- curtain wall
- rigid
- blocking
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- 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
- E02B9/02—Water-ways
- E02B9/022—Closures
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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
Abstract
The invention discloses a rigid water-blocking structure for reducing water leakage quantity at the side wall of the lower end of a water-blocking curtain wall, which comprises a fixed structure which is connected with the water-blocking curtain wall and is matched with the water-blocking curtain wall in shape; the surface of the fixing structure far away from the water retaining curtain wall is connected with a plurality of rigid water retaining units which are vertically arranged. The invention has the advantages of light and thin structure, easy construction and low cost, and can effectively reduce the water leakage quantity at the side wall of the water retaining curtain wall.
Description
Technical Field
The invention relates to the field of water conservancy and hydropower engineering, in particular to a rigid water blocking structure for reducing water leakage quantity at the side wall of the lower end of a water blocking curtain wall.
Background
The water retaining curtain wall can be used for improving the water drainage temperature of a large reservoir, relieving adverse effects of low-temperature water, and also can be used for relieving numerous ecological engineering fields such as sea-opening salt water invasion phenomenon. The method can be operated underwater during construction, does not need to empty the water body in a construction area, and remarkably reduces the construction cost. However, during underwater operation, fine correction cannot be performed on the underwater topography of the deep water, so that gaps are inevitably left between the side wall at the lower end of the water retaining curtain wall and the topography, water leakage is caused, and the engineering effect of the water retaining curtain wall is affected.
The water retaining curtain wall has larger size which can reach tens of thousands of square meters. When the water retaining curtain wall is assembled in place, the side wall is positioned at a position which is tens of meters or even hundreds of meters deep under water, and the gap cannot be sealed under water in the prior art. It is therefore necessary to take measures to reduce the leakage of water at the gap before assembly.
For large-scale water retaining curtain wall, the construction platform is mostly a narrow and long structure such as a floating bridge, and the construction area is narrow. When the water retaining curtain wall is assembled, most of the water retaining curtain wall is hoisted. Because the device with overlarge volume and overlarge weight is difficult to hoist on a narrow platform under the limitation of construction conditions, the water blocking device has the characteristics of light weight and easy assembly under the limitation of construction conditions.
The current water retaining curtain wall has few researches, and no effective solution has been proposed in the industry aiming at the problems about the leakage of the water flow of the side wall.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the water blocking structure which is light and thin in structure, easy to construct and low in manufacturing cost and can effectively reduce the leakage of water flow at the side wall of the water blocking curtain wall.
In order to solve the technical problems, the invention adopts the following technical scheme: the rigid water blocking structure for reducing the water leakage amount at the side wall of the lower end of the water blocking curtain wall comprises a fixed structure which is connected with the bottom end of the water blocking curtain wall and is matched with the bottom end of the water blocking curtain wall in shape; the surface of the fixing structure far away from the water retaining curtain wall is connected with at least one rigid water retaining unit which is vertically arranged.
By means of the structure, the gradual expansion flow state formed by the side wall and the topography of the water retaining curtain wall is changed, and the flow state with alternate sudden expansion and sudden contraction is formed. The turbulent flow of the fluid water body is intense, and the water head loss of the water flow is larger. For the same size gap, the leakage can be reduced by about half.
The number of the rigid water blocking units is 1-5. The more the number of the water-blocking units is, the better the water-blocking effect is, but the more the number of the water-blocking units is increased, the more limited the water-blocking effect is, so that the water-blocking effect is set to be 1-5, the economy is improved, and the better water-blocking effect can be ensured.
When the number of the rigid water blocking units is more than two, the interval between the rigid water blocking units is larger than the length of the rigid water blocking units; or under the impact of water flow, the gap at the bottom end of the rigid water blocking unit is enlarged by not more than 50%. Ensuring better water blocking effect.
The number of the rigid water blocking units is 3, and the interval between two adjacent rigid water blocking units is 10m.
The water blocking unit is a rigid water blocking unit; the rigid water blocking unit comprises a water blocking plate, and the top end of the water blocking plate is fixedly connected with the fixed structure; the top end of the water baffle is fixedly connected with the fixed structure through a hinged support. The rigid water blocking unit is suitable for the condition of moderate flow rate, and is also suitable for the condition of larger flow rate at the water leakage gap at the bottom of the water blocking curtain wall, and the application range is wide.
Compared with the prior art, the invention has the following beneficial effects: the invention has the advantages of light and thin structure, easy construction and low cost, and can effectively reduce the water leakage quantity at the side wall of the water retaining curtain wall.
Drawings
FIG. 1 is a schematic view of a water curtain wall and water blocking structure arrangement in longitudinal section according to the present invention;
fig. 2 is a block diagram of an embodiment of the rigid water blocking structure of the present invention.
Detailed Description
Example this example relies on the low temperature water management project of the Guizhou Qinghai three-plate stream power station. The three-plate stream power station is the second stage of 15 cascade power stations of the main water main flow, has the regulation performance for many years, the normal water storage level of a reservoir is 475.00m, the maximum dam height is 185.5m, and the water inlet bottom plate height of the diversion power generation system is 408.00m. After the reservoir stores water, the reservoir area presents obvious temperature layering phenomenon, the water temperature at the reservoir bottom is only 9.6 ℃, 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. In order to enable fishes to have proper water temperature conditions in the spawning period, a water retaining curtain wall is built at the position about 250m upstream of a water inlet of a power station to improve the water temperature of the three-plate brook power station. In fig. 1, curve 2 is a longitudinal section of the water retaining curtain wall at a part below the elevation of the water intake of the power station.
At the construction position of the water retaining curtain wall, the underwater topography 1 is a covering layer, and the shape is complex. The existing engineering means can only reduce the gap height between the lower end of the water retaining curtain wall and the terrain to 1-2 m. According to numerical simulation calculation, the average flow velocity of the gap is about 0.42m/s and the water leakage amount is about 61m at the spawning period of 5 months at the temperature of fish propagation 3 Per s, the water leakage per unit width is about 0.84m 2 And/s. In the three-plate brook area, the bottom of the water storage is low-temperature water, and a large amount of leakage of the low-temperature water has a great adverse effect on the water temperature improvement effect of the water retaining curtain wall, so that a water retaining structure is required to be arranged at the bottom end of the water retaining curtain wall.
Fig. 2 shows a rigid water blocking structure. The structure is connected with the water retaining curtain wall through the curved surface fixing structure 3 in a binding or welding mode. A hinge support 6 is provided on the structure 3 to fix a rigid water deflector 7. The material of the water baffle is dependent on the flow velocity of the water flow (if the impact force of the water flow is large, a steel plate, a concrete plate and the like can be considered, and if the impact force of the water flow is moderate, the plastic steel plate can also be used for retaining water in principle, and if the water flow is not large under the impact of the water flow, the gap at the bottom end can be enlarged after the water flow swings, and the enlarged width is not more than 50 percent, or the water flow cannot collide with the adjacent water baffle units during the swing, and in principle, the water flow cannot swing greatly under the impact of the water flow.
A water blocking structure is simulated by adopting a vertical-face two-dimensional hydrodynamic model, the water flow inlet and the water flow outlet of the model are both pressure boundaries, and the pressure difference is 0.005m water head. When the height of the gap at the bottom end of the curtain wall is 2m, the average flow velocity at the gap is 0.36m/s, and the single-width flow is 0.72m 2 And/s. The water blocking structure is added at the bottom of the water blocking curtain wall, the number of the water blocking units is 3, the horizontal distances from the bottom end of the curtain wall are 20m, 30m and 40m respectively, and the intervals of the three water blocking units are 10m. The height of the gap between the water blocking structure and the terrain is the same as that of the water blocking curtain wall and is 2m. According to the flow field analysis of the numerical simulation result, most of the kinetic energy of water flow is consumed at the structure, the average flow speed at the gap is reduced to 0.22m/s, and the single-width flow is reduced to 0.44m 2 And/s, blocking 39% of the leakage flow.
Therefore, the water blocking effect of the embodiment is good, and the popularization value is good.
Claims (6)
1. The rigid water blocking structure for reducing the water leakage amount at the side wall of the lower end of the water blocking curtain wall is characterized by comprising a fixed structure (3) which is connected with the bottom end of the water blocking curtain wall (2) and is matched with the bottom end of the water blocking curtain wall (2) in shape; the surface of the fixed structure (3) far away from the water retaining curtain wall (2) is connected with at least one rigid water blocking unit which is vertically arranged; the rigid water blocking unit comprises a water blocking plate (7) with the top end connected with the fixed structure (3) through a hinged support (6).
2. The rigid water blocking structure for reducing the water leakage amount at the lower end side wall of the water blocking curtain wall according to claim 1, wherein the number of the rigid water blocking units is 1-5.
3. The rigid water blocking structure for reducing the leakage of water at the lower end side wall of the water blocking curtain wall according to claim 2, wherein the number of the rigid water blocking units is 3, and the interval between two adjacent rigid water blocking units is 10m.
4. The rigid water blocking structure for reducing the leakage of water at the lower end side wall of the water blocking curtain wall according to claim 2, wherein when the number of the rigid water blocking units is two or more, the interval between the rigid water blocking units is larger than the length of the rigid water blocking units.
5. The rigid water blocking structure for reducing the leakage of water flow at the lower end side wall of the water blocking curtain wall according to claim 1, wherein the gap at the bottom end of the rigid water blocking unit is increased by no more than 50% under the impact of water flow.
6. The rigid water blocking structure for reducing the water leakage amount at the lower end side wall of the water blocking curtain wall according to claim 1, wherein the water blocking plate (7) is one of a steel plate, a concrete plate and a plastic steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711296546.6A CN108104075B (en) | 2017-12-08 | 2017-12-08 | Rigid water-blocking structure for reducing water leakage quantity at edge wall of lower end of water-blocking curtain wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711296546.6A CN108104075B (en) | 2017-12-08 | 2017-12-08 | Rigid water-blocking structure for reducing water leakage quantity at edge wall of lower end of water-blocking curtain wall |
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| Publication Number | Publication Date |
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| CN108104075A CN108104075A (en) | 2018-06-01 |
| CN108104075B true CN108104075B (en) | 2023-07-25 |
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| CN201711296546.6A Active CN108104075B (en) | 2017-12-08 | 2017-12-08 | Rigid water-blocking structure for reducing water leakage quantity at edge wall of lower end of water-blocking curtain wall |
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Families Citing this family (1)
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| CN110820667B (en) * | 2019-09-06 | 2023-12-12 | 山东鑫天河新材料科技有限公司 | Deepwater water blocking-based water blocking curtain, device and method for releasing water bottom |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM357182U (en) * | 2008-12-12 | 2009-05-11 | Hon Hai Prec Ind Co Ltd | Airflow guiding apparatus |
| CN201748820U (en) * | 2010-06-22 | 2011-02-16 | 上海良机冷却设备有限公司 | Water flow speed reducing device in cooling tower |
| JP4773577B1 (en) * | 2010-10-08 | 2011-09-14 | 秀樹 藤田 | Water shielding device |
| CN105421309A (en) * | 2015-12-22 | 2016-03-23 | 天津大学前沿技术研究院有限公司 | Overlap joint device between water retaining curtains |
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