CN203846463U - Sudden-drop and sudden-expansion structure in free-flow spillway tunnel reconstruction - Google Patents
Sudden-drop and sudden-expansion structure in free-flow spillway tunnel reconstruction Download PDFInfo
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- CN203846463U CN203846463U CN201420251730.4U CN201420251730U CN203846463U CN 203846463 U CN203846463 U CN 203846463U CN 201420251730 U CN201420251730 U CN 201420251730U CN 203846463 U CN203846463 U CN 203846463U
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- diversion tunnel
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- 238000005273 aeration Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 230000003628 erosive effect Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a sudden-drop and sudden-expansion structure in free-flow spillway tunnel reconstruction. The sudden-drop and sudden-expansion structure comprises a dragon-raise-head tunnel body which is newly and additionally constructed and an original diversion tunnel body. The height of the dragon-raise-head tunnel body decreases gradually from the starting end to the tail end. At the connecting position of the dragon-raise-head tunnel body and the diversion tunnel body, the height of the dragon-raise-head tunnel body is 0.5-1.0 m higher than the height of the diversion tunnel body, and the width of one side of the dragon-raise-head tunnel body is 0.3-0.8 m smaller than the width of the diversion tunnel body. The sudden-drop and sudden-expansion structure in free-flow spillway tunnel reconstruction has the advantages that when a city gate opening-shaped diversion tunnel is reconstructed into a free-flow spillway tunnel, due to the fact that the tail end of the dragon-raise-head tunnel body is higher in water flow speed and larger in Froude number, the connecting position of the dragon-raise-head tunnel body and the diversion tunnel body is designed into two different tunnel body cross sections, the sudden-drop and sudden-expansion effect is achieved, cavitation erosion damage of high-speed water flow can be effectively reduced, the effect of erosion reduction by aeration is achieved, the operation safety of the rear section of the dragon-raise-head tunnel body is protected, and the sudden-drop and sudden-expansion structure is suitable for reconstruction of high-speed water flow spillway tunnels allowing the flow speed in the tunnels to be higher than 25 m/s.
Description
Technical field
The utility model relates to hydraulic engineering, especially relates to the prominent sudden expansion structure of falling in a kind of gateway opening type reconstruction of diversion tunnel free-flow spillway tunnel.
Background technology
Take in the Large Hydro-Junction process of construction that local material dam is dam type, according to flood discharge scale and local topographic and geologic condition situation, often need to arrange two above flood discharging tunnels.Flood discharging tunnel cost is higher, utilizes the interim reconstruction of diversion tunnel of construction period to become permanent flood discharging tunnel (utilize former Diversion Tunnel barrel structure, increase dragon and come back), can not only turn waste into wealth, reduce investment outlay, the reduction of erection time, but also can solve the difficult problem that cannot arrange many flood discharging tunnels because of landform restriction.
But, because the effect of Diversion Tunnel is the interim flood discharge of hinge construction period, be low water level operation flood discharging tunnel, its import elevation is general close with elevation at the bottom of former river course; Permanent flood discharging tunnel belongs to high water level operation flood discharging tunnel, high water level operation flood discharging tunnel especially in the hole of high water level operation free-flow spillway tunnel flow velocity higher, what have even surpasses 40m/s, far over the high-velocity flow of regulation and stipulation cavitation prevention structure.So Diversion Tunnel increases dragon new line, reconstruct into free-flow spillway tunnel, first should solve the cavitation erosion problem of high-velocity flow to barrel structure, especially at dragon new line end, contact hole section with Diversion Tunnel barrel, flow rate of water flow is the highest, and cavitation erosion possibility is maximum.
Summary of the invention
The purpose of this utility model is to provide a kind of prominent sudden expansion structure of falling for gateway opening type reconstruction of diversion tunnel free-flow spillway tunnel.
For achieving the above object, the utility model can be taked following technical proposals:
The prominent sudden expansion structure of falling in reconstruction free-flow spillway tunnel described in the utility model, comprise newly-increased dragon new line barrel and the original Diversion Tunnel barrel of building, described imperial new line barrel reduces gradually from top to end height, joining place at described imperial new line barrel and Diversion Tunnel barrel, high 0.5 ~ the 1.0m of height of the aspect ratio Diversion Tunnel barrel of dragon new line barrel, the one-sided width of imperial new line barrel is than the narrow 0.3 ~ 0.8m of Diversion Tunnel barrel.
In hole, the flow velocity of current is when 25 ~ 30m/s, at the joining place of described imperial new line barrel and Diversion Tunnel barrel, and the high 0.5 ~ 0.8m of height of the aspect ratio Diversion Tunnel barrel of imperial new line barrel, the one-sided width of imperial new line barrel is than the narrow 0.3 ~ 0.5m of Diversion Tunnel barrel.
In hole, the flow velocity of current is when 30 ~ 35m/s, at the joining place of described imperial new line barrel and Diversion Tunnel barrel, and the high 0.8 ~ 1.0m of height of the aspect ratio Diversion Tunnel barrel of imperial new line barrel, the one-sided width of imperial new line barrel is than the narrow 0.5 ~ 0.8m of Diversion Tunnel barrel.If the flow velocity of current surpasses 35m/s in hole, also need to be provided with aeration bottom outlet in the dragon new line barrel bottom near imperial new line barrel and Diversion Tunnel barrel joining place simultaneously, on the Diversion Tunnel barrel abutment wall near imperial new line barrel and Diversion Tunnel barrel joining place, be provided with aeration side opening.
The utility model has the advantage of when gateway opening shape reconstruction of diversion tunnel is free-flow spillway tunnel, consider that imperial new line end flow rate of water flow is larger, Froude number is higher, by dragon is come back, barrel and Diversion Tunnel barrel joining place are designed to two sections of different barrel sections, be about to the section width constriction (one-sided width constriction 0.3 ~ 0.8m) of the dragon new line barrel of imperial new line barrel and Diversion Tunnel barrel joining place, reduce the barrel profile height (difference in height is reduced to 0.5 ~ 1.0m) of imperial new line barrel end, produce sudden enlargement and sudden, can effectively subdue the cavitation erosion of high-velocity flow, reach the effect of air mixing corrosion reducing, protected the security of operation of imperial new line back segment barrel, in applicable hole, flow velocity is greater than the high-velocity flow flood discharging tunnel transformation of 25m/s.
Accompanying drawing explanation
Fig. 1 is the vertical face figure of barrel structure of the present utility model.
Fig. 2 is the plan structure schematic diagram of Fig. 1.
The specific embodiment
As shown in Figure 1, 2, the prominent sudden expansion structure of falling in reconstruction free-flow spillway tunnel described in the utility model, comprise newly-increased dragon new line barrel 1 and the original Diversion Tunnel barrel 2 of building, increasing the dragon new line barrel 1 build reduces gradually from top to end height, joining place at dragon new line barrel 1 with Diversion Tunnel barrel 2, high 0.5 ~ the 1.0m of height of the aspect ratio Diversion Tunnel barrel 2 of dragon new line barrel 1, the one-sided width of dragon new line barrel 1 is than the narrow 0.3 ~ 0.8m of Diversion Tunnel barrel 2, and its joining place forms " dash forward and fall sudden expansion " structure.
During practice of construction, when the end flow rate of water flow of dragon new line barrel is less than 30m/s, high 0.5 ~ the 0.8m of height of the aspect ratio Diversion Tunnel barrel 2 of the dragon new line barrel 1 of dragon new line barrel 1 and Diversion Tunnel barrel 2 joining places, the one-sided width of dragon new line barrel 1 is than the narrow 0.3 ~ 0.5m of Diversion Tunnel barrel 2, prominent falling is highly 0.5 ~ 0.8m, one-sided sudden expansion width is 0.3 ~ 0.5m, current aeration is from gas production in width more than headroom in hole, the overflow air that air forms by both sides sudden expansion, to cavity air feed at the bottom of the lower overflow of air pressure, reaches high-velocity flow aeration effect.
When flow velocity is between 30m/s and 35m/s, prominent falling is highly 0.8 ~ 1.0m, and one-sided sudden expansion width is 0.5 ~ 0.8m, and high-velocity flow aeration principle is the same.
When flow velocity surpasses more than 35m/s, prominent falling is highly 0.8 ~ 1.0m, one-sided sudden expansion width is 0.5 ~ 0.8m, on the same basis of high-velocity flow aeration principle, increase end cavity aeration and abutment wall aeration: in dragon new line barrel 1 bottom near imperial new line barrel and Diversion Tunnel barrel joining place, aeration bottom outlet 3 is set simultaneously, on Diversion Tunnel barrel 2 abutment walls near imperial new line barrel and Diversion Tunnel barrel joining place, aeration side opening 4 is set, to reach cavitation prevention and corrosion inhibitor effect.During practice of construction, aeration bottom outlet 3 is steel plate structure, and bearing bar arranges according to actual needs.Aeration pore cross section size not only will meet aeration needs, also will meet the needs of maintenance, maintenance.
Claims (4)
1. the prominent sudden expansion structure of falling of reconstructing in free-flow spillway tunnel, comprise newly-increased dragon new line barrel (1) and the original Diversion Tunnel barrel (2) of building, it is characterized in that: described imperial new line barrel (1) reduces gradually from top to end height, joining place at described imperial new line barrel (1) with Diversion Tunnel barrel (2), high 0.5 ~ the 1.0m of height of the aspect ratio Diversion Tunnel barrel (2) of dragon new line barrel (1), the one-sided width of imperial new line barrel (1) is than the narrow 0.3 ~ 0.8m of Diversion Tunnel barrel (2).
2. the prominent sudden expansion structure of falling in reconstruction free-flow spillway tunnel according to claim 1, it is characterized in that: the joining place at described imperial new line barrel (1) with Diversion Tunnel barrel (2), high 0.5 ~ the 0.8m of height of the aspect ratio Diversion Tunnel barrel (2) of dragon new line barrel (1), the one-sided width of imperial new line barrel (1) is than the narrow 0.3 ~ 0.5m of Diversion Tunnel barrel (2).
3. the prominent sudden expansion structure of falling in reconstruction free-flow spillway tunnel according to claim 1, it is characterized in that: the joining place at described imperial new line barrel (1) with Diversion Tunnel barrel (2), high 0.8 ~ the 1.0m of height of the aspect ratio Diversion Tunnel barrel (2) of dragon new line barrel (1), the one-sided width of imperial new line barrel (1) is than the narrow 0.5 ~ 0.8m of Diversion Tunnel barrel (2).
4. the prominent sudden expansion structure of falling in reconstruction free-flow spillway tunnel according to claim 3, it is characterized in that: in dragon new line barrel (1) bottom near imperial new line barrel and Diversion Tunnel barrel joining place, be provided with aeration bottom outlet (3), on Diversion Tunnel barrel (2) abutment wall near imperial new line barrel and Diversion Tunnel barrel joining place, be provided with aeration side opening (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420251730.4U CN203846463U (en) | 2014-05-16 | 2014-05-16 | Sudden-drop and sudden-expansion structure in free-flow spillway tunnel reconstruction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420251730.4U CN203846463U (en) | 2014-05-16 | 2014-05-16 | Sudden-drop and sudden-expansion structure in free-flow spillway tunnel reconstruction |
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| CN203846463U true CN203846463U (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420251730.4U Expired - Lifetime CN203846463U (en) | 2014-05-16 | 2014-05-16 | Sudden-drop and sudden-expansion structure in free-flow spillway tunnel reconstruction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104594308A (en) * | 2015-01-14 | 2015-05-06 | 中国电建集团中南勘测设计研究院有限公司 | Pressure sudden expansion and sudden fall circular jet flow energy dissipater |
| CN110424322A (en) * | 2019-08-15 | 2019-11-08 | 湖北省水利水电规划勘测设计院 | Deep hole test data acquisition device and the barrel selection method tested based on deep hole |
-
2014
- 2014-05-16 CN CN201420251730.4U patent/CN203846463U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104594308A (en) * | 2015-01-14 | 2015-05-06 | 中国电建集团中南勘测设计研究院有限公司 | Pressure sudden expansion and sudden fall circular jet flow energy dissipater |
| CN104594308B (en) * | 2015-01-14 | 2016-02-17 | 中国电建集团中南勘测设计研究院有限公司 | There is pressure sudden enlargement and sudden Circular Jet energy dissipater |
| CN110424322A (en) * | 2019-08-15 | 2019-11-08 | 湖北省水利水电规划勘测设计院 | Deep hole test data acquisition device and the barrel selection method tested based on deep hole |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: 450003 Jinshui Road 109, Zhengzhou City, Henan Province Patentee after: YELLOW RIVER ENGINEERING CONSULTING Co.,Ltd. Address before: 450003 Jinshui Road 109, Zhengzhou City, Henan Province Patentee before: YELLOW RIVER ENGINEERING CONSULTING Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140924 |