CN218373714U - Hydraulic and hydroelectric engineering stilling pond secondary dam structure - Google Patents
Hydraulic and hydroelectric engineering stilling pond secondary dam structure Download PDFInfo
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- CN218373714U CN218373714U CN202222871479.9U CN202222871479U CN218373714U CN 218373714 U CN218373714 U CN 218373714U CN 202222871479 U CN202222871479 U CN 202222871479U CN 218373714 U CN218373714 U CN 218373714U
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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
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Abstract
The utility model relates to a hydraulic and hydroelectric engineering absorption basin second dam structure raises through building the base face position with second dam toe, makes it be located the intermediate position above the base face elevation of second dam heel department and below the natural riverbed efflorescence layer, utilizes the special size of second dam, reduces second dam side slope excavation volume and concrete engineering volume, practices thrift the engineering investment.
Description
Technical Field
The utility model belongs to the technical field of hydraulic construction among the hydraulic and hydroelectric engineering, a hydraulic and hydroelectric engineering absorption pond secondary dam structure is related to.
Background
In the construction of water conservancy and hydropower engineering, the dam discharge energy dissipation mode adopts the engineering of trajectory jet energy dissipation, a stilling pond is constructed under most conditions, and a secondary dam needs to be arranged on the stilling pond to form water damming so as to meet the depth and length of a water cushion required by dam discharge.
At present, a second dam of a stilling pond of a dam is generally arranged at a certain distance at the downstream of the dam according to the depth of the stilling pond, the foundation building planes of the front and the rear parts of the second dam are the same, and the second dam is gradually connected with an original river bed after being excavated through the second dam. However, the foundation of the stilling pond is usually deep, the strength and the bearing capacity of the foundation are far greater than those of the foundation of a secondary dam, in order to meet the arrangement requirement of the secondary dam, the foundation of the secondary dam is usually uniformly excavated to the foundation of the stilling pond, and meanwhile, in order to prevent the dam feet from being washed by discharged water flow to influence the safety of the secondary dam, an erosion protection flat is also required to be arranged at the downstream of the toe of the secondary dam. Therefore, it is necessary to find an economical and reasonable arrangement structure of the secondary dam, which can not only meet the engineering requirements, but also reduce the engineering cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a hydraulic and hydroelectric engineering disappears two dam structures in pond has solved the big and high problem of engineering cost of the engineering volume that faces in the traditional two dam construction process.
The utility model adopts the technical proposal that the hydraulic and hydroelectric engineering stilling pool two-way dam structure comprises a two-way dam body, stilling pool revetments are respectively arranged at two opposite sides of the upstream of the two-way dam body, a stilling pool bottom protection is arranged at one side of the upstream of the stilling pool bottom of the two-way dam body, one side of the downstream of the slope bottom of the secondary dam body is provided with a downstream protection flat, the two opposite sides of the downstream of the secondary dam body are respectively provided with a downstream protection slope, the upstream bottom of the secondary dam body is a secondary dam heel, and the downstream bottom of the secondary dam body is a secondary dam toe.
The utility model discloses a characteristics still lie in:
the cross section of the dam body of the secondary dam is of a triangular structure.
The toe height of the second dam is higher than the heel of the second dam.
The base surface of the downstream apron is the same as the base surface of the toe of the secondary dam.
The beneficial effects of the utility model are that, the utility model discloses build the base face dam toe department excavation face with the two-channel dam and raise, effectively reduce the difference in height between former two-channel dam base face and the natural riverbed of low reaches, recycle low reaches scour protection and protect flat effectively and link up with the riverbed, coordinate the completion in the construction range who satisfies hydraulic and hydroelectric engineering correlation technique standard and two-channel dam. The utility model discloses a two dam structures have optimized traditional two dam size, reduce two dam side slope excavation volume and concrete engineering volume, reduce the engineering investment.
Drawings
FIG. 1 is a schematic view of the upstream structure of the second dam structure of the hydraulic and hydroelectric engineering stilling pond of the present invention;
FIG. 2 is a schematic view of the downstream structure of the second dam structure of the hydraulic and hydroelectric engineering stilling pond of the present invention;
fig. 3 is the cross section structure schematic diagram of the utility model relates to a hydraulic and hydroelectric engineering stilling pond second dam structure.
In the figure, 1 is a dam body of a second dam, 2 is a stilling pond bottom protection, 3 is a stilling pond protection slope, 4 is a downstream protection, 5 is a downstream protection slope, 6 is a dam heel of the second dam, and 7 is a dam toe of the second dam.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a hydraulic and hydroelectric engineering stilling pond second dam structure, as shown in fig. 1, 2, including second dam upper reaches stilling pond structure and second dam low reaches apron structure. The direction of the arrows in fig. 1 and 2 indicates the direction of water flow.
The structural forms of the upstream stilling pond bottom protection 2 and the stilling pond slope protection 3 are determined according to the original engineering design.
The axial line position of the secondary dam body 1 is determined according to the cast distance of the discharged water flow and the rolling length in the plunge pool, or according to whether the hydrodynamic pressure at the secondary dam is close to the downstream hydrostatic pressure.
The dam body material of the secondary dam 1 is generally a mass concrete structure, and the design should be determined by preferentially considering the utilization of stone materials primarily mined from foundation pits or plunge pools or large stones in excavation materials and comprehensively considering the construction process and the investment cost.
The dam height of the dam body 1 of the secondary dam meets the requirement of the thickness of the water cushion of the plunge pool, so that the water flow entering the pool forms submerged hydraulic jump, and simultaneously meets the requirements of the bottom plate of the plunge pool on impact dynamic water pressure, pulsating pressure, anti-floating stability and anti-vibration performance. The requirement of connection of the dam-passing water flow and the water flow of the downstream riverbed is also considered, so that the downstream riverbed is prevented from being washed.
The arrangement form of the dam body 1 of the secondary dam is designed according to actual engineering.
The foundation surface of the secondary dam body 1 is consistent with the plunge pool, and foundation grouting and curtain grouting are performed according to the seepage-proofing stability requirement.
As shown in fig. 3 (the arrow direction in fig. 3 is the water flow direction), the initial section of the dam body 1 of the secondary dam is a triangle-like section, the heel 6 of the secondary dam is located below or on the foundation surface of the plunge pool, the toe 7 of the secondary dam is elevated according to the excavation height difference between the downstream natural riverbed and the foundation surface of the secondary dam and the geological conditions, so that the toe 7 of the secondary dam is located above the elevation of the foundation surface at the heel 6 of the secondary dam and below the strong layer of the natural riverbed, the foundation surface can be excavated into a step-like shape or inclined to an upstream slope shape, thereby effectively solving the deep excavation condition caused by the traditional secondary dam construction, and is connected with the downstream apron 4, the deep excavation problem caused by considering the problem of connection with the downstream riverbed when the downstream apron 4 is constructed can be simultaneously reduced by elevating the foundation surface, meanwhile, the section volume of the dam body is correspondingly reduced, the section filling amount of the dam body 1 of the secondary dam is reduced, and the concrete design is determined according to the concrete stress design specification and the comprehensive calculation and the actual conditions.
The base surface of the downstream apron 4 is the same as the toe 7 of the second dam, and the structural form of the base surface is determined to meet the requirements of scour prevention and stable safety of the dam toe of the second dam. Wherein, the downstream revetment 5 structural style considers the natural riverbed condition and the geological condition of the two sides river bank to design.
Claims (5)
1. The utility model provides a hydraulic and hydroelectric engineering absorption pond second dam structure which characterized in that: the dam comprises a secondary dam body (1), wherein the opposite sides of the upstream of the secondary dam body (1) are respectively provided with a stilling pool protection slope (3), one side of the upstream of the slope bottom of the secondary dam body (1) is provided with a stilling pool protection bottom (2), one side of the downstream of the slope bottom of the secondary dam body (1) is provided with a downstream protection flat (4), the opposite sides of the downstream of the secondary dam body (1) are respectively provided with a downstream protection slope (5), the upstream bottom of the secondary dam body (1) is a secondary dam heel (6), and the downstream bottom of the secondary dam body (1) is a secondary dam toe (7).
2. The hydraulic and hydroelectric engineering stilling pond secondary dam structure of claim 1, wherein: the cross section of the secondary dam body (1) is of a triangular structure.
3. The hydraulic and hydroelectric engineering stilling pond secondary dam structure of claim 1, wherein: the height of the dam toe (7) of the second dam is higher than that of the dam heel (6) of the second dam.
4. The hydraulic and hydroelectric engineering stilling pond secondary dam structure of claim 1, wherein: the downstream apron (4) is of a structure with a low middle part and two high sides.
5. The hydraulic and hydroelectric engineering stilling pond secondary dam structure of claim 1, wherein: the base surface of the downstream apron (4) is the same as the base surface of the dam toe (7) of the secondary dam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222871479.9U CN218373714U (en) | 2022-10-28 | 2022-10-28 | Hydraulic and hydroelectric engineering stilling pond secondary dam structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222871479.9U CN218373714U (en) | 2022-10-28 | 2022-10-28 | Hydraulic and hydroelectric engineering stilling pond secondary dam structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218373714U true CN218373714U (en) | 2023-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202222871479.9U Active CN218373714U (en) | 2022-10-28 | 2022-10-28 | Hydraulic and hydroelectric engineering stilling pond secondary dam structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218373714U (en) |
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2022
- 2022-10-28 CN CN202222871479.9U patent/CN218373714U/en active Active
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