CN218373714U - Hydraulic and hydroelectric engineering stilling pond secondary dam structure - Google Patents

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

A second dam structure of stilling pond in water conservancy and hydropower projects

technical field

The utility model belongs to the technical field of hydraulic construction in water conservancy and hydropower projects, and relates to a structure of a stilling pond and two dams in water conservancy and hydropower projects.

Background technique

In the construction of water conservancy and hydropower projects, the discharge and energy dissipation method of the dam adopts the energy dissipation project of deflecting flow. In most cases, a stilling pond will be built, and the stilling pond needs to be arranged with a second dam to form backwater to meet the large Depth and length of water cushion required for dam discharge.

At present, the second dam of the stilling pond of the dam is generally arranged at a certain distance downstream of the dam according to the depth of the stilling pond. River bed connection. However, the foundation of the stilling pond is often deep, and the strength and bearing capacity of the foundation are far greater than the needs of Erdaoba construction. In order to meet the layout requirements of Erdaodam, the foundation of Erdaodam is usually excavated to the foundation of the stilling pond , and at the same time, in order to prevent the discharge water from scouring the dam toe and affecting the safety of Erdaoba, it is necessary to set up a scour apron at the downstream of Erdaoba's dam toe. For a project that differs greatly from the elevation of the natural riverbed downstream, the Erdao Dam built is huge in size, with "super strong" dam materials and "super stable" safety, which not only increases the amount of excavation, but also increases the cost of Erdao Dam. amount of concrete work. Therefore, it is necessary to find an economical and reasonable arrangement structure of the second dam, which can meet the engineering needs and reduce the engineering cost.

Utility model content

The purpose of the utility model is to provide a hydroelectric engineering stilling pond secondary dam structure, which solves the problems of large engineering quantity and high engineering cost faced in the traditional secondary dam construction process.

The technical solution adopted by the utility model is, a water conservancy and hydropower project stilling pond Erdao dam structure, including the Erdao dam body, the opposite sides of the upstream of the Erdao dam body are respectively provided with a stilling pond for slope protection, and the Erdao dam body The upstream side of the slope bottom of the dam body is provided with a stilling pond bottom protection, the downstream side of the slope bottom of the Erdaoba dam body is provided with a downstream apron, and the downstream opposite sides of the Erdaoba dam body are respectively provided with downstream slope protection. The upstream bottom of the Erdaoba dam body is the Erdaoba dam heel, and the downstream bottom of the Erdaoba dam body is the Erdaoba dam toe.

The utility model is also characterized in that:

The cross section of the Erdaoba dam body is a triangular structure.

The height of Erdaoba dam toe is higher than Erdaoba dam heel.

The foundation surface of the downstream apron is the same as that of the Erdaoba dam toe.

The beneficial effect of the utility model is that the utility model raises the excavation surface at the dam toe of the foundation surface of the Erdao dam, effectively reduces the elevation difference between the foundation surface of the original Erdao dam and the downstream natural river bed, and utilizes the downstream anti-corrosion The abutment is effectively connected with the riverbed, and it is coordinated and completed within the scope of meeting the relevant technical specifications of water conservancy and hydropower projects and the construction of Erdao Dam. The structure of the Erdao Dam designed by the utility model optimizes the body shape of the traditional Erdao Dam, reduces the amount of excavation of the side slope of the Erdao Dam and the amount of concrete engineering, and reduces project investment.

Description of drawings

Fig. 1 is the upstream structure schematic diagram of a kind of water conservancy and hydropower engineering stilling pond two dam structure of the utility model;

Fig. 2 is a schematic diagram of the downstream structure of the second dam structure of the stilling pond of the utility model;

Fig. 3 is a cross-sectional structural schematic diagram of a stilling pond second dam structure of a water conservancy and hydropower project according to the utility model.

In the figure, 1. Erdaoba dam body, 2. Stilling pond bottom protection, 3. Stilling pond slope protection, 4. Downstream apron, 5. Downstream slope protection, 6. Erdaoba dam heel, 7. Erdaodam Dam toe.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The utility model relates to a water conservancy and hydropower project stilling pond Erdaoba structure, as shown in Figures 1 and 2, comprising the Erdaoba upstream stilling pond structure and the Erdaoba downstream apron structure. The direction of the arrow in Fig. 1 and Fig. 2 indicates the direction of water flow.

The structural forms of the upstream stilling pond bottom protection 2 and stilling pond slope protection 3 are determined according to the original engineering design.

The position of the dam axis of Erdaoba dam body 1 is determined according to the throwing distance of the discharged water flow and the length of the roll in the pool, or according to whether the hydrodynamic pressure at the Erdaodam is close to the downstream hydrostatic pressure.

The dam body of Erdaoba 1 is generally a large-volume concrete structure, and the design should give priority to the use of primary excavated stones from foundation pits or pad ponds or large stones in excavated materials, and comprehensive consideration of construction technology and investment costs Sure.

The dam height of Erdaoba dam body 1 should meet the thickness requirements of the water cushion pond, so that the water flowing into the pond forms a submerged hydraulic jump, and at the same time meet the impact hydrodynamic pressure, pulsating pressure, anti-floating stability and anti-vibration performance requirements of the water cushion pond bottom plate. It is also necessary to consider the connection requirements between the dam water flow and the downstream river bed to avoid the erosion of the downstream river bed.

The layout form of Erdaoba dam body 1 is designed according to actual engineering.

The foundation surface of Erdaoba dam body 1 is consistent with that of the water cushion pond, and foundation grouting and curtain grouting are carried out according to the anti-seepage and stability requirements.

As shown in Figure 3 (the direction of the arrow in Figure 3 is the direction of water flow), the initial section form of the Erdaoba dam body 1 is a triangular-like section, and the 6 places of the Erdaodam dam heel are located on the foundation surface or the foundation surface of the water cushion pond Below, the Erdaoba dam toe 7 position is based on the excavation elevation difference between the downstream natural river bed and the Erdaoba foundation surface and the geological conditions. In the middle positions above the elevation of the foundation surface and below the strong weathered layer of the natural riverbed at the 6 intermediate positions, the foundation surface can be excavated into a step shape or a slope inclined to the upstream, so as to effectively solve the deep excavation situation caused by the construction of the traditional Erdao Dam and integrate with the downstream The abutment 4 is connected, and by raising the foundation surface, it can simultaneously reduce the deep excavation problem caused by considering the connection with the downstream riverbed when the downstream apron 4 is constructed. 1 concrete filling volume, the specific cross-sectional design shall be comprehensively determined by calculating the stable stress according to the "Code for Design of Concrete Gravity Dams" and considering the actual situation factors.

Among them, the foundation surface of the downstream apron 4 is the same as that of the Erdaoba dam toe 7, and its structural form is determined to meet the anti-scouring and stability of the Erdaodam dam foot. Among them, the structural form of the downstream slope protection 5 is designed considering the condition of the natural river bed and the geological conditions of the banks on both sides.

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.

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