CN217325279U - Annual construction cofferdam type of hydropower station diversion tunnel inlet - Google Patents
Annual construction cofferdam type of hydropower station diversion tunnel inlet Download PDFInfo
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- CN217325279U CN217325279U CN202220818172.XU CN202220818172U CN217325279U CN 217325279 U CN217325279 U CN 217325279U CN 202220818172 U CN202220818172 U CN 202220818172U CN 217325279 U CN217325279 U CN 217325279U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The utility model discloses a power station diversion tunnel import's annual construction cofferdam pattern, including low rock bank, low rock bank top rigid coupling has the concrete cofferdam, and concrete cofferdam one side is equipped with the biography power floor, and the equal butt in one side of going away from the cofferdam of biography power floor has limit mound and middle mound. The utility model discloses the annual construction cofferdam type of power station diversion tunnel import, to construct the cofferdam at the diversion tunnel import of riverbed stenosis often can meet the terrain condition restriction, solved and constructed the annual earth rock cofferdam and can lead to former riverbed to restraint too narrow too much, thereby bring the velocity of flow too big, to the question that the earth rock cofferdam seriously erodes; the problem of rock bank manger plate throughout the year can force diversion tunnel intake tower to arrange and move backward to lead to diversion tunnel import to form the high side slope, can bring high slope stability and strong support is solved, have apparent economic benefits.
Description
Technical Field
The utility model belongs to the technical field of the water conservancy water and electricity construction, concretely relates to all year round construction cofferdam pattern of power station diversion tunnel import.
Background
At present, in hydropower stations and hydraulic engineering built in high mountain gorge areas and large rivers in China, a diversion mode of diversion tunnels for water passing is generally adopted in construction periods. However, the cofferdam construction at the entrance of a diversion tunnel with a narrow riverbed is often limited by terrain conditions. Generally, the water retaining cost for constructing the all-year-round earth-rock cofferdam is lower, but the problem that the flow rate of the original narrow river bed is too large and the earth-rock cofferdam is seriously washed is caused because the original narrow river bed is too narrow, and even the problem cannot be solved.
The research on the built engineering utilizing tunnel diversion in hydropower stations and hydraulic engineering in China shows that: the diversion tunnel inlet construction cofferdams with narrow riverbeds are mostly constructed by annual earth-rock cofferdams or rock bank water retaining all the year round, but the construction of the annual earth-rock cofferdams can cause too narrow original riverbeds, so that the problems that the flow velocity of the narrow original riverbeds is too high and the earth-rock cofferdams are seriously washed are caused; rock bank manger plate can force diversion tunnel intake tower to arrange and move backward throughout the year to lead to diversion tunnel import to form the high side slope, can bring the problem of high side slope stability and strong support.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a power station diversion tunnel import's annual construction cofferdam pattern has solved the velocity of flow that leads to in the constrictive diversion tunnel import construction annual cofferdam of riverbed too big, erodees serious problem to the earth-rock cofferdam.
The utility model discloses the technical scheme who adopts is, the annual construction cofferdam pattern of power station diversion tunnel import, including low rock bank, low rock bank top butt has the concrete cofferdam, and one side that the concrete cofferdam kept away from low rock bank has arranged a plurality of biography power floor, passes power floor and low rock bank butt, and the power floor butt that passes that is close to the concrete cofferdam edge has the side mound, and the power floor butt that passes that is close to the concrete cofferdam middle part has well mound, side mound and well parallel.
The utility model is also characterized in that,
the width of the low rock ridge is 4-6 m, the height is 5-10m, and the included angle between the waterproof surface of the low rock ridge and the horizontal plane is 45-60 degrees.
The thickness of the side pier is 5m-10m, and the thickness of the middle pier is 3 m-5 m.
The thickness of the concrete cofferdam is 5m-10m and the reinforced concrete structure of C20 or C25 is adopted.
The thickness of the force transmission ribbed plate is 1 m-3 m, and the reinforced concrete structure of C20 or C25 is adopted.
The beneficial effects of the utility model are that:
1. the utility model discloses the annual construction cofferdam pattern of power station diversion tunnel import to building the cofferdam to the constrictive diversion tunnel import in the riverbed often can receive the topographic condition restriction, solved and built the annual terra rockfill cofferdam and can lead to former riverbed to restraint narrowly too much to bring the velocity of flow too big, to the serious problem that erodees of terra rockfill cofferdam.
2. The utility model discloses the annual construction cofferdam pattern of power station diversion tunnel import has solved the rock bank manger plate of all the year and has forced diversion tunnel intake tower to arrange and move backward to lead to the import of diversion tunnel to form the high side slope, can bring the problem that the high side slope is stable and strong to be strutted, have apparent economic benefits.
Drawings
Fig. 1 is the structural schematic diagram of the annual construction cofferdam type of the utility model of the import of the diversion tunnel of the hydropower station.
In the figure, 1, a low rock ridge, 2, side piers, 3, a concrete cofferdam, 4, force transmission rib plates and 5, a middle pier.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model discloses power station diversion tunnel import's annual construction cofferdam type, including low rock bank 1, there is concrete cofferdam 3 low rock bank 1 top butt, and one side butt that concrete cofferdam 3 kept away from low rock bank 1 has three biography power floor 4, and two biography power floors 4 that are close to concrete cofferdam 3 edges all butt have limit mound 2, and the 4 butts of biography power floor that are close to concrete cofferdam 3 middle part have middle mound 5, and limit mound 2 is parallel with middle mound 5.
The width of the low rock ridge 1 is 4 m-6 m, the height is 5m-10m, and the included angle between the waterproof surface of the low rock ridge 1 and the horizontal plane is 45-60 degrees.
The side piers 2 have a thickness of 5m to 10m, and the middle piers 5 have a thickness of 3m to 5 m.
The thickness of the concrete cofferdam 3 is 5m-10m and adopts a reinforced concrete structure of C20 or C25.
The thickness of the force transmission ribbed slab 4 is 1 m-3 m and the reinforced concrete structure of C20 or C25 is adopted.
The utility model discloses the working process of the annual construction cofferdam pattern of power station diversion tunnel import specifically includes following step:
step 1, excavating a relatively low rock bank according to the topographic and geological conditions of a riverbed, wherein the width of the top of the low rock bank 1 is about 5m, the height of the low rock bank is 5-10m, and the included angle between the top of the low rock bank and the horizontal plane is 45-60 degrees. Because the general rock conditions of the low rock ridge 1 are poor, consolidation grouting is often needed for reinforcement treatment in order to adapt to water retaining, seepage prevention and stability; some low rock banks 1 belong to the soil rock bank type, then need curtain grout to carry out antiseep and handle, and the top needs great type vibration to grind to carry out the compaction in order to satisfy the bearing needs of upper portion reinforced concrete cofferdam 3. The low threshold 1 generally blocks only a small flow in the dry season, which is generally from 11 months per year to 5 months in the next year. The side pier 2 and the middle pier 5 of the opening of the water inlet tower are built while the low rock ridge 1 blocks the flow in the dry season, and the side pier 2 and the middle pier 5 of the opening of the water inlet tower can be used as a supporting foundation of the reinforced concrete cofferdam 3 all the year round after being constructed to a certain height. The water inlet tower hole of the common large diversion tunnel engineering is provided with two orifices, so that two concrete side piers 2 and a concrete middle pier 5 are arranged;
the low rock ridge 1 blocks the flow in the dry season, the flow at the inlet of the diversion tunnel in the dry season is determined according to the size of the river, and the flow is about 50-1000m 3 S; in the step 1, the opening of the water inlet tower is generally determined according to the diversion scale of the diversion tunnel, and the small diversion tunnel is provided with only one opening and two side piers 2; the large diversion tunnel is provided with two holes and a middle pier 5 besides the two side piers 2, the thickness of the side piers 2 of the water inlet tower is 5-10m, and the thickness of the middle pier 5 is 3-5 m;
and 2, constructing a full-year reinforced concrete cofferdam 3 and a force transmission ribbed plate 4 on the low rock ridge 1, transmitting flood pressure at a water inlet of the diversion tunnel to the full-year reinforced concrete cofferdam 3, and transmitting the pressure to the side pier 2 and the middle pier 5 of the water inlet tower by the full-year reinforced concrete cofferdam 3 through the force transmission ribbed plate 4. The core of the utility model is that the flood pressure at the water inlet of the diversion tunnel is transmitted to the side piers 2 and the middle pier 5 of the water inlet tower through the force transmission ribbed plate 4, but the traditional cofferdam is maintained stably by the self-huge dead weight;
the thickness of the concrete cofferdam 3 is 5m-10m, and the thickness of the force transmission ribbed slab is 1.0-3.0 m. The concrete cofferdam 3 and the force transmission ribbed slab 4 both adopt a reinforced concrete structure of C20 or C25.
And step 3, blocking the annual flood by the concrete cofferdam 3 in the flood season.
And 4, after the flood season passes, the water inlet tower and the diversion tunnel are completely completed, the water passing condition is met, the cofferdam and the rock bank water retaining are not needed, the concrete cofferdam 3 and the low rock bank 1 in the dry season are dismantled in the dry season, namely all the water retaining facilities are dismantled after the water inlet tower and the diversion tunnel are constructed, and the dismantling method can adopt a blasting mode. When the device is close to the water inlet tower and the diversion tunnel, the device can be detached by a percussion drill in order to avoid damage and damage to the device in an explosive mode.
The utility model discloses the annual construction cofferdam pattern of power station diversion tunnel import to building the cofferdam in the constrictive diversion tunnel import of riverbed often can meet the topographic condition restriction, builds annual earth-rock cofferdam promptly and can lead to former riverbed to restraint narrowly too much to bring the velocity of flow too big, the problem that seriously erodes in the earth-rock cofferdam. The problems of insufficient stability and safety of the earth-rock cofferdam can be solved.
The utility model discloses to often can meet the terrain condition restriction at the constrictive diversion tunnel import of riverbed construction cofferdam, if adopt the rock bank manger plate of whole year can force the diversion tunnel to intake the tower and arrange backward moving to lead to the import of diversion tunnel to form the high side slope, can bring high side slope excavation, strut the too big problem of engineering volume. Has remarkable economic benefit.
Claims (5)
1. The annual construction cofferdam type of power station diversion tunnel import, its characterized in that, including low rock bank (1), low rock bank (1) top butt has concrete cofferdam (3), one side that low rock bank (1) was kept away from in concrete cofferdam (3) has arranged a plurality of biography power floor (4), biography power floor (4) and low rock bank (1) butt, be close to biography power floor (4) butt at concrete cofferdam (3) edge has connect side pier (2), is close to biography power floor (4) butt at concrete cofferdam (3) middle part has middle mound (5), side mound (2) and middle mound (5) are parallel.
2. The year round construction cofferdam form of a hydroelectric power station diversion tunnel inlet of claim 1, wherein the width of said low sill (1) is 4 m-6 m, the height is 5m-10m, and the angle between the waterproof surface of said low sill (1) and the horizontal plane is 45-60 °.
3. The year round cofferdam form of a hydroelectric power station diaphragm tunnel inlet of claim 1, wherein the side piers (2) have a thickness of 5m to 10m and the middle piers (5) have a thickness of 3m to 5 m.
4. The annual construction cofferdam form of a hydroelectric power station diaphragm tunnel inlet of claim 1, wherein said concrete cofferdam (3) has a thickness of 5m to 10m and adopts a reinforced concrete structure of C20 or C25.
5. The annual construction cofferdam form of a hydroelectric power station diversion tunnel inlet of claim 1, wherein said force-transmitting floor (4) has a thickness of 1m to 3m and is of a reinforced concrete structure of C20 or C25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220818172.XU CN217325279U (en) | 2022-04-08 | 2022-04-08 | Annual construction cofferdam type of hydropower station diversion tunnel inlet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220818172.XU CN217325279U (en) | 2022-04-08 | 2022-04-08 | Annual construction cofferdam type of hydropower station diversion tunnel inlet |
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| CN217325279U true CN217325279U (en) | 2022-08-30 |
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| CN202220818172.XU Active CN217325279U (en) | 2022-04-08 | 2022-04-08 | Annual construction cofferdam type of hydropower station diversion tunnel inlet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117230819A (en) * | 2023-07-27 | 2023-12-15 | 中国水利水电第三工程局有限公司 | Hydropower station factory building foundation pit under stage cofferdam diversion working condition and tail water channel construction method thereof |
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2022
- 2022-04-08 CN CN202220818172.XU patent/CN217325279U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117230819A (en) * | 2023-07-27 | 2023-12-15 | 中国水利水电第三工程局有限公司 | Hydropower station factory building foundation pit under stage cofferdam diversion working condition and tail water channel construction method thereof |
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