CN108104076B - Flexible water blocking structure for reducing water flow leakage quantity at side wall of lower end of water blocking curtain wall - Google Patents
Flexible water blocking structure for reducing water flow leakage quantity at side wall of lower end of water blocking curtain wall Download PDFInfo
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- CN108104076B CN108104076B CN201711296569.7A CN201711296569A CN108104076B CN 108104076 B CN108104076 B CN 108104076B CN 201711296569 A CN201711296569 A CN 201711296569A CN 108104076 B CN108104076 B CN 108104076B
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- water
- water blocking
- curtain wall
- flexible
- side wall
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 230000000903 blocking effect Effects 0.000 title claims abstract description 60
- 239000004746 geotextile Substances 0.000 claims description 11
- 230000005484 gravity Effects 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 description 9
- 239000004744 fabric Substances 0.000 description 6
- 238000012876 topography Methods 0.000 description 5
- 241000251468 Actinopterygii Species 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
-
- 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)
- Building Environments (AREA)
Abstract
The invention discloses a flexible 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 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 fixed structure far away from the water retaining curtain wall is connected with a plurality of flexible 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 flexible 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 flexible 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 lower surface of the fixing structure (namely, one surface of the fixing structure far away from the water retaining curtain wall) is connected with at least one flexible water blocking 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 flexible water blocking structures is 1-5. The more the number of the water-blocking structures is, the better the water-blocking effect is, but the more the number of the water-blocking structures is, the more limited the water-blocking effect is, so that the water-blocking structure is set to be 1-5 sets more economically, and the better water-blocking effect can be ensured.
The flexible water blocking unit comprises low-permeability high-strength geotextile; the bottom end of the low-permeability high-strength geotechnical cloth is provided with a gravity anchor chain; the gravity anchor chain is sewn at the bottom end of the first water-permeable high-strength geotextile. The geotextile structure is light and thin, and the weight of the geotextile can be increased by the gravity anchor chain, so that the geotextile is prevented from being flushed away by water flow.
In the invention, the bottom gap height of the flexible water blocking unit is the same as the bottom gap height of the water blocking curtain wall.
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 flexible water blocking structure of the present invention.
Detailed Description
Examples
The embodiment relies on the low-temperature water treatment project of the Guizhou clear water river 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 brook is low-temperature water, and a large amount of leakage of the low-temperature water has an effect of improving the water temperature of the water retaining curtain wallHas great adverse effect, so that a water blocking structure is required to be arranged at the bottom end of the water blocking curtain wall.
Fig. 2 is an enlarged schematic view of the flexible water blocking structure. The structure has light dead weight, simple construction and lower cost. The structure is connected with the water retaining curtain wall 2 through a curved surface fixing structure 3 in a sewing, gluing or hot welding mode. 1-5 geotechnical cloth 4 with high strength and low water permeability is sequentially arranged at the downstream of a water outlet at the bottom end of the water retaining curtain wall, and due to the fact that main water retaining parts of different projects are different in size, gaps are different in size, topography is different in fluctuation, flow velocity at the gaps is also different, and the factors have obvious influence on the arrangement of the geotechnical cloth 4 and the water retaining effect. Therefore, the number and the spacing of different engineering geotechnical cloths are different greatly, and a unified theorem is difficult to obtain. Currently, the geotextile number and interval are calculated by numerical simulation or model test. The height of the geotextile depends on the distance between the water retaining curtain wall and the ground surface, and in principle, the water leakage gap at the bottom is reduced as much as possible. And the gravity anchor chain 5 is arranged at the bottom end of the geotechnical cloth, so that the weight of the geotechnical cloth is increased, and the geotechnical cloth is prevented from being flushed away by water flow. The gravity anchor chain 5 is sewn with the high-strength low-permeability geotextile.
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 flexible water blocking structure is added at the bottom of the water blocking curtain wall, the number of water blocking units is 3, the horizontal distance from the bottom end of the curtain wall is 20m, 30m and 40m respectively, and the interval between two adjacent water blocking units is 10m. The height of the bottom gap of the water blocking structure is the same as that of the bottom gap 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 (7)
1. The flexible water blocking structure for reducing the water leakage quantity at the side wall of the lower end of the water blocking curtain wall is characterized by comprising a fixed structure (3) which is fixedly 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 lower surface of the fixed structure (3) is connected with at least one flexible water blocking unit which is vertically arranged; the bottom gap height of the flexible water blocking unit is the same as that of the water blocking curtain wall (2).
2. The flexible water blocking structure for reducing the water leakage amount at the side wall of the lower end of the water blocking curtain wall according to claim 1, wherein the number of the flexible water blocking units is 1-5.
3. The flexible 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 flexible water blocking unit comprises a geotextile (4) with low water permeability.
4. The flexible water blocking structure for reducing water leakage amount at the side wall of the lower end of the water blocking curtain wall according to claim 3, wherein the bottom end of the low-permeability geotextile (4) is provided with a gravity anchor chain (5).
5. The flexible water blocking structure for reducing the water leakage amount at the side wall of the lower end of the water blocking curtain wall according to claim 4, wherein the gravity anchor chain (5) is sewn at the bottom end of the low water permeability geotextile (4).
6. The flexible water blocking structure for reducing the water leakage amount at the lower end side wall of the water blocking curtain wall according to claim 2, wherein the number of the flexible water blocking units is 3, and the interval between two adjacent flexible water blocking units is 10m.
7. The flexible 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 bottom end gap height of the flexible water blocking unit is 2m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711296569.7A CN108104076B (en) | 2017-12-08 | 2017-12-08 | Flexible water blocking structure for reducing water flow leakage quantity at side wall of lower end of water blocking curtain wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711296569.7A CN108104076B (en) | 2017-12-08 | 2017-12-08 | Flexible water blocking structure for reducing water flow leakage quantity at side wall of lower end of water blocking curtain wall |
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| Publication Number | Publication Date |
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| CN108104076A CN108104076A (en) | 2018-06-01 |
| CN108104076B true CN108104076B (en) | 2023-10-31 |
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| CN201711296569.7A Active CN108104076B (en) | 2017-12-08 | 2017-12-08 | Flexible water blocking structure for reducing water flow leakage quantity at side wall of lower end of water blocking curtain wall |
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| CN112580129B (en) * | 2020-11-12 | 2022-07-12 | 中国电建集团中南勘测设计研究院有限公司 | Limit condition analysis method for main component of water-proof curtain wall |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006161371A (en) * | 2004-12-06 | 2006-06-22 | Chugoku Electric Power Co Inc:The | Suspended curtain-wall impervious-membrane assembly and its installation method |
| CN104878728A (en) * | 2015-06-18 | 2015-09-02 | 天津大学前沿技术研究院有限公司 | Floating-suspending combined flexible water retaining curtain |
| CN204690703U (en) * | 2015-06-02 | 2015-10-07 | 天津大学前沿技术研究院有限公司 | A kind of flexible curtain of suspension type controlling reservoir stratified pumping |
| CN106638482A (en) * | 2017-02-08 | 2017-05-10 | 天津大学 | Sectional curtain water barrier structure |
| CN207891841U (en) * | 2017-12-08 | 2018-09-21 | 中国电建集团中南勘测设计研究院有限公司 | A kind of flexible stop water reducing flow leakage rate at the side wall of water blocking curtain wall lower end |
-
2017
- 2017-12-08 CN CN201711296569.7A patent/CN108104076B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006161371A (en) * | 2004-12-06 | 2006-06-22 | Chugoku Electric Power Co Inc:The | Suspended curtain-wall impervious-membrane assembly and its installation method |
| CN204690703U (en) * | 2015-06-02 | 2015-10-07 | 天津大学前沿技术研究院有限公司 | A kind of flexible curtain of suspension type controlling reservoir stratified pumping |
| CN104878728A (en) * | 2015-06-18 | 2015-09-02 | 天津大学前沿技术研究院有限公司 | Floating-suspending combined flexible water retaining curtain |
| CN106638482A (en) * | 2017-02-08 | 2017-05-10 | 天津大学 | Sectional curtain water barrier structure |
| CN207891841U (en) * | 2017-12-08 | 2018-09-21 | 中国电建集团中南勘测设计研究院有限公司 | A kind of flexible stop water reducing flow leakage rate at the side wall of water blocking curtain wall lower end |
Non-Patent Citations (2)
| Title |
|---|
| 练继建 ; 杜慧超 ; 马超 ; .隔水幕布改善深水水库下泄低温水效果研究.水利学报.2016,(第07期),第1、3节. * |
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| CN108104076A (en) | 2018-06-01 |
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