CN203530941U - Split-level and dislocated type multiple-grooved spillway structure - Google Patents

Abstract

The utility model discloses a split-level and dislocated type multiple-grooved spillway structure which comprises a set of flood discharge grooves connected with an overflow weir 3 in a juxtaposed manner, the height of the set of the flood discharge grooves is reduced or increased gradually in a split-level arrangement, and the length of the set of the flood discharge grooves is reduced or increased gradually in a staggered arrangement. The split-level and dislocated type multiple-grooved spillway structure solves the problem that a conventional bank-type spillway built in steep places at two banks of a dam is high in investment and slope, and concentrated in riverbed flushing, is saving in investment, short in construction period and low in difficulty for processing a high slope and minimizes damage to environment by reducing excavation area. Discharged water runs through flood discharge grooves and bucket lips with different elevation and different plan positions, water with different initial running speed, emitting angles and deflected flowing directions clashes in the air to minimize energy, thereby reducing the flushing force on downstream riverbed and bank slopes. The split-level and dislocated type multiple-grooved spillway structure is excellent in effect and economic returns. Hydraulic model tests prove that no reflexion and scour flow is found in the flood discharge grooves and the general flow state is good.

Description

Staggered multi-groove spillway structure

technical field

The utility model relates to a staggered layer and staggered multi-groove spillway structure, which belongs to the technical field of reservoir flood discharge.

Background technique

The water retaining structure is a water conservancy project of a rockfill dam, and most of its flood discharge structures use bank-type spillways. For mountainous areas, the terrain on both sides of the dam site is undulating, and most of the slopes where the spillway is located are steep, so the overall layout of the bank-side spillway is difficult. If the spillway of the spillway is still conventionally arranged in the form of the same length and equal elevation of each hole, it will cause large earthwork excavation, increase investment, lengthen construction period, increase the difficulty of high slope treatment, and increase the excavation area at the same time It brings about a series of problems such as great damage to the environment, and the concentration of water jetting out of the nose ridge to scour and damage the downstream river bed.

Contents of the invention

The purpose of the utility model is to provide a multi-groove spillway structure with staggered floors and staggered positions. On the premise of ensuring the stable discharge flow in the spillway, reduce slope excavation, reduce investment, reduce high slope treatment, reduce excavation area, and reduce concentrated erosion of downstream river beds.

Technical scheme of the utility model:

A staggered multi-groove spillway structure, comprising a group of spillway troughs connected in parallel with the overflow weir, the heights of the set of parallel spillway troughs are arranged in successively decreasing or increasing staggered levels; at the same time, the lengths of a group of parallel spillway troughs are sequentially arranged Decrement or increment offset setting.

In the aforementioned spillway structure, the spillway trough is a U-shaped trough cast by reinforced concrete, including a trough wall and a trough bottom.

In the aforementioned spillway structure, the bottom of the spillway is sequentially divided into a gentle slope section, a parabolic section, a steep slope section and an anti-arc deflecting flow section from upstream to downstream.

In the aforementioned spillway structure, the bottom of the anti-arc deflecting section is a circular arc bottom, the water inlet surface of the circular arc bottom is connected with the steep slope section, the water outlet surface of the circular arc bottom is provided with a deflecting nose sill, and the highest point of the deflecting nose sill is set There is a slope perpendicular to the direction of water flow.

Compared with the prior art, the utility model overcomes the disadvantages of high investment, high side slope, and concentrated scouring of the riverbed in the construction of bank-side spillways under the steep terrain conditions on both banks of the dam site, and has the advantages of saving investment, shortening the construction period, and reducing the height of the spillway. The difficulty of slope treatment and the advantages of reducing the excavation area and causing large-scale damage to the environment. At the same time, the discharged water passes through the spillway and the nose sill at different elevations and different plane positions. Due to the difference in initial velocity, exit angle and deflection flow direction, the ejected water further collides in the air and dissipates energy, reducing the impact on the downstream riverbed and bank slope. The flushing effect is obvious and the economy is better. According to the hydraulic model test, there is no gushing flow in the spillway, and the overall flow state is good.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a plane layout diagram of the utility model;

Fig. 3 is a longitudinal sectional view of the spillway;

Fig. 4 is the lateral sectional view of spillway;

Fig. 5 is a structural schematic diagram of the anti-arc deflection section.

The marks in the attached drawings are: 1-spill trough, 2-reverse arc deflection section, 3-overflow weir, 4-trough wall, 5-gentle slope section, 6-parabolic section, 7-steep slope section, 8-arc Bottom, 9-protruding nose sill, 10-slope.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings, but not as any limitation to the utility model.

A staggered layer and staggered multi-groove spillway structure, as shown in Figure 1. It includes a group of spillway troughs connected in parallel with the overflow weir 3, the heights of the set of parallel spillway troughs 1 are arranged in successively decreasing or increasing heights (see Figure 1 and Figure 4); at the same time, the lengths of a group of parallel spillway troughs 1 are sequentially Decreasing or increasing misalignment settings (see Figures 1 and 2). The spillway 1 is a U-shaped trough poured with reinforced concrete, including a trough wall 4 and a trough bottom (see FIG. 2 ). The bottom of the spillway 1 is sequentially divided into a gentle slope section 5 , a parabolic section 6 , a steep slope section 7 and an anti-arc deflection section 2 from upstream to downstream (see Figure 1 and Figure 3 ). The bottom of the anti-arc deflecting section 2 is an arc bottom 8, the water inlet surface of the arc bottom 8 is connected with the steep slope section 7, and the water outlet surface of the arc bottom 8 is provided with a deflecting nose sill 9, and the deflecting nose sill 9 is the highest There is a slope 10 perpendicular to the direction of water flow (see Figure 5).

Example

The utility model staggered, staggered multi-groove spillway discharge structure is shown in Figure 1, which includes a spillway 1 and a reverse-arc deflecting section 2. The upstream of the flood discharge groove 1 is connected with the overflow weir 3 , and the downstream surface is connected with the anti-arc deflection section 2 . The flood discharge channel 1 is composed of a gentle slope section 5, a parabolic section 6 and a steep slope section 7, and the flood discharge channel 1 and the anti-arc deflection section 2 of each hole are misaligned on the plane. As shown in Figure 2, each hole spillway is staggered in elevation. The vertical flow direction at the highest point of the nose sill 9 is an inclined plane 10 . The spillway 1 and the anti-arc deflection section 3 are reinforced concrete structures. According to the actual terrain fluctuations, the initial pile number and length of the staggered level of the spillway and the height of the staggered level between the spillway of each hole can be adjusted, but attention should be paid to the stability of the structure and the treatment of the joints. According to the discharge flow of the spillway and the anti-scouring situation of the lithology of the downstream riverbed, the projecting angle and anti-arc radius at the nose sill can be adjusted, and different slopes and angles of the nose sill can be set according to different spillway openings. Pay attention to the protection of the nose sill near the bank. The nose sill can also be combined with a narrow slit deflection structure to further meet energy dissipation requirements. If the above parameters can be determined in combination with hydraulic model tests, the energy dissipation effect will be better.

The applicable model has remarkable effects in reducing excavation, saving investment, reducing high slopes, etc., and is safe, applicable, economical, smooth in water flow and good in energy dissipation effect, and can be widely used in the design of spillways on bank slopes in mountainous areas.

Claims (4)

1. A staggered multi-groove spillway structure, including a set of spillway troughs connected in parallel with the overflow weir (3), characterized in that: the heights of the set of parallel spillway troughs (1) are successively decreasing or increasing Layer setting; at the same time, the lengths of a group of juxtaposed spillways (1) are sequentially decreased or increased in dislocation setting. 2. The spillway structure according to claim 1, characterized in that: the spillway trough (1) is a U-shaped trough cast by reinforced concrete, including a trough wall (4) and a trough bottom. 3. The spillway structure according to claim 1, characterized in that: the bottom of the spillway (1) is sequentially divided into a gentle slope section (5), a parabolic section (6), a steep slope section (7) and a Anti-arc deflection section (2). 4. The spillway structure according to claim 3, characterized in that: the bottom of the anti-arc deflecting section (2) is an arc bottom (8), and the water inlet surface of the arc bottom (8) and the steep slope section (7) To connect, the water outlet surface of the arc bottom (8) is provided with a deflecting nose sill (9), and the highest point of the deflecting nose sill (9) is provided with a slope (10) perpendicular to the direction of water flow.

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