CN204199255U - Prevent the Diversion Tunnel structure of gas explosion - Google Patents
Prevent the Diversion Tunnel structure of gas explosion Download PDFInfo
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- CN204199255U CN204199255U CN201420636162.XU CN201420636162U CN204199255U CN 204199255 U CN204199255 U CN 204199255U CN 201420636162 U CN201420636162 U CN 201420636162U CN 204199255 U CN204199255 U CN 204199255U
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- diversion tunnel
- steam vent
- gas explosion
- hole
- water inlet
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Abstract
It is a kind of Diversion Tunnel structure preventing gas explosion in Hydraulic and Hydro-Power Engineering field disclosed in the utility model, this Diversion Tunnel structure comprises Diversion Tunnel, described Diversion Tunnel comprises water inlet and sealing region, the steam vent running through hole wall is provided with between the water inlet and sealing region of described Diversion Tunnel, described steam vent be positioned at Diversion Tunnel arch crown part and away from the Shallow Section of Diversion Tunnel, steam vent higher than initial generating level, should be provided with the guard aperture structure that steel pipe is made away from the elevation of the outlet of Diversion Tunnel one end in steam vent exit.The beneficial effects of the utility model are: by arranging the structure of steam vent between Diversion Tunnel water inlet and sealing region, after certain weak part of hole, plug upstream section is worn by storehouse water attack, air in hole is discharged by steam vent, can avoid producing gas explosion or effectively reducing the harm of gas explosion, thus ensure the safety of plug in construction period and runtime.
Description
Technical field
The utility model relates to Hydraulic and Hydro-Power Engineering field, particularly relates to a kind of Diversion Tunnel structure preventing gas explosion.
Background technology
When the construction of hydropower stations, in order to build dam, need the cofferdam up and down of building dash, before damming, need the outlet presetting river, conventional has two kinds of methods, is channel diversion and use Diversion Tunnel respectively.Channel diversion refers to and excavates another river course on side, river, and when damming, water flows away from open channel, and dam has been built by open channel closure; River drawn by the tunnel that Diversion Tunnel refers to directly excavation big cross section in massif, and dam has been built again by Diversion Tunnel shutoff.The general buried depth of Diversion Tunnel is more shallow, and geological conditions is poor, under Diversion Tunnel after lock along with reservoir level rise, the Wall Rock of Tunnel of blocking sluice gate of diversion tunnel and plug upstream will bear increasing head.For high shutoff head Diversion Tunnel, after first paragraph bulkhead concrete has been built, certain weak part of the hole section of plug upstream may be punctured by high external water pressure, storehouse water will pour in Diversion Tunnel, the gutter drainage effect of plug bottom is limited, the large quantity of air gathered in hole cannot be discharged in time, by producing serious gas explosion, jeopardizes the construction safety of plug.For high dash head Diversion Tunnel, certain weak part of hole section in plug run duration plug upstream also may be punctured by high external water pressure, storehouse water will pour in Diversion Tunnel, the large quantity of air gathered in hole cannot be discharged in time, also serious gas explosion will be produced, the grouting of plug periphery may be destroyed, jeopardize the security of operation of plug.
Traditional Diversion Tunnel structure design does not consider the exhaust facility of plug front hole section, and during Diversion Tunnel plugging construction, the air in hole can only pass through rock mass gap slow releasing.If experience gas explosion, construction safety and the security of operation of plug are born by stopper structure entirely, there is certain potential safety hazard.
Utility model content
Easily cause the deficiencies such as gas explosion for overcoming in existing Diversion Tunnel structure because not having exhaust facility, technical problem to be solved in the utility model is: provide a kind of Diversion Tunnel structure that effectively can prevent gas explosion.
The utility model solves the technical scheme that its technical problem adopts: the Diversion Tunnel structure preventing gas explosion, comprise Diversion Tunnel, described Diversion Tunnel comprises water inlet and sealing region, it is characterized in that: between the water inlet and sealing region of described Diversion Tunnel, be provided with the steam vent running through Diversion Tunnel hole wall, described steam vent is positioned at the arch crown part of Diversion Tunnel.
Further, described steam vent can not be positioned at the Shallow Section of Diversion Tunnel.
Further, described steam vent is outlet away from one end of Diversion Tunnel, and the elevation of described steam vent outlet is higher than initial generating level.
Further, described steam vent exit is provided with the guard aperture structure that steel pipe is made.
The beneficial effects of the utility model are: by arranging the structure of steam vent between Diversion Tunnel water inlet and sealing region, after certain weak part of hole, plug upstream section is worn by storehouse water attack, air in hole is discharged by steam vent, can avoid producing gas explosion or effectively reducing the harm of gas explosion, thus ensure the safety of plug in construction period and runtime.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Be labeled as in figure, 1-Diversion Tunnel, 2-water inlet, 3-sealing region, 4-steam vent, 5-exports, 6-guard aperture structure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further illustrated.
As shown in Figure 1, the utility model is on the basis of original Diversion Tunnel, and between Diversion Tunnel water inlet 2 and sealing region 3, be provided with the steam vent 4 running through Diversion Tunnel hole wall, described steam vent 4 is positioned at the arch crown part of Diversion Tunnel 1.Steam vent 4 should start construction after lock under Diversion Tunnel, according to field condition, 2 ~ 3 steam vents can be set, aperture should be enough large, and the position of steam vent 4 should as far as possible away from the Shallow Section of Diversion Tunnel, because these hole, position walls are thinner, easily punctured by high external water pressure, if the pore that begins to rehearse above again will reduce the supporting capacity of hole wall further, likely produce more serious accident.
Reach to make steam vent 4 and preferably obtain exhaust effect, the outlet 5 of steam vent should higher than the initial generating level of reservoir, because reservoir level is in hole wall is the most easily punctured by high external water pressure during this period of time increasing to initial generating level, if the outlet 5 of fruit steam vent is lower than initial generating level, when water level, to have covered Diversion Tunnel when steam vent exports 5 breakdown, and at this moment steam vent just can not play the effect of exhaust.
The sandstone that quality may be had softer due to some massif surfaces or earth, steam vent is likely blocked, so be provided with the guard aperture structure 6 adopting steel pipe to make in the position of the outlet 5 of steam vent, it is 5 blocked that this guard aperture structure can prevent steam vent from exporting, in addition, if current go up too fast, steel pipe of more looking can also be added at guard aperture structure 6 place with the elevation improving steam vent to adapt to the breakdown situation of Diversion Tunnel under more high water level.
The course of work of the present utility model is: under Diversion Tunnel after lock, if barrel is breakdown when reservoir level exports 5 elevation lower than steam vent, water burst enters after in hole, along with water level in hole rises, in hole, air will be discharged from steam vent 4, the intensity greatly reducing gas explosion generation even be avoided producing gas explosion (relevant with the speed that water level in hole rises); If aperture elevation is lower than normal pool level, after reservoir level reaches aperture elevation, storehouse water will in the inflow hole of aperture, this process is a process of pouring water and being vented, if water level rises enough slow, then can discharge the air in hole completely, even if Diversion Tunnel is breakdown, also can avoid gas explosion occurs, if the water level rate of climb is very fast, in hole, air may have little time to discharge completely, because air reduces in a large number in hole, even if now Diversion Tunnel is breakdown, also the impact of gas explosion on plug greatly can be reduced; If steam vent exports 5 elevations higher than normal pool level, can after plug have been constructed, by avoiding to the mode of the water filling air of discharging in hole in hole producing gas explosion.
Claims (4)
1. prevent the Diversion Tunnel structure of gas explosion, comprise Diversion Tunnel (1), described Diversion Tunnel (1) comprises water inlet (2) and sealing region (3), it is characterized in that: between the water inlet (2) and sealing region (3) of described Diversion Tunnel (1), be provided with the steam vent (4) running through Diversion Tunnel (1) hole wall, described steam vent (4) is positioned at the arch crown part of Diversion Tunnel (1).
2. prevent the Diversion Tunnel structure of gas explosion as claimed in claim 1, it is characterized in that: described steam vent (4) can not be positioned at the Shallow Section of Diversion Tunnel (1).
3. prevent the Diversion Tunnel structure of gas explosion as claimed in claim 1, it is characterized in that: described steam vent (4) is outlet (5) away from one end of Diversion Tunnel (1), and the elevation of described steam vent outlet (5) is higher than initial generating level.
4. the Diversion Tunnel structure preventing gas explosion as described in claim 1,2 or 3, is characterized in that: outlet (5) place of described steam vent (4) is provided with the guard aperture structure (6) that steel pipe is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420636162.XU CN204199255U (en) | 2014-10-29 | 2014-10-29 | Prevent the Diversion Tunnel structure of gas explosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420636162.XU CN204199255U (en) | 2014-10-29 | 2014-10-29 | Prevent the Diversion Tunnel structure of gas explosion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204199255U true CN204199255U (en) | 2015-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420636162.XU Active CN204199255U (en) | 2014-10-29 | 2014-10-29 | Prevent the Diversion Tunnel structure of gas explosion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963324A (en) * | 2015-05-29 | 2015-10-07 | 中国电建集团贵阳勘测设计研究院有限公司 | Diversion tunnel plug head exhaust structure and exhaust method thereof |
| CN105839604A (en) * | 2016-05-19 | 2016-08-10 | 中国电建集团成都勘测设计研究院有限公司 | Rapid diversion tunnel plugging structure and plugging method thereof |
-
2014
- 2014-10-29 CN CN201420636162.XU patent/CN204199255U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963324A (en) * | 2015-05-29 | 2015-10-07 | 中国电建集团贵阳勘测设计研究院有限公司 | Diversion tunnel plug head exhaust structure and exhaust method thereof |
| CN105839604A (en) * | 2016-05-19 | 2016-08-10 | 中国电建集团成都勘测设计研究院有限公司 | Rapid diversion tunnel plugging structure and plugging method thereof |
| CN105839604B (en) * | 2016-05-19 | 2018-03-06 | 中国电建集团成都勘测设计研究院有限公司 | Plugging structure for diversion tunnel and diversion tunnel rapid plugging method for first filling |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |