Arc-shaped step energy dissipation structure

Abstract

The utility model belongs to the technical field of water conservancy and hydropower engineering, and discloses an arc-shaped step energy dissipation structure which is characterized in that a step-shaped structure is arranged along the bottom of a groove, the step-shaped structure is composed of steps layer by layer, the step-shaped structure is arranged from the upstream to the downstream, each step comprises a step plane and a step vertical plane, and the step plane and the step vertical plane are arranged in a staggered mode. And the step vertical surface is concave inwards towards the inner side direction of the step plane, so that the step vertical surface forms an arc-shaped structure. The energy dissipation effect is higher, main flow is located in the middle of the section, side slope scouring is relieved, structural stability is good, and construction efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to an arc-shaped step energy dissipation structure. Background Art

[0002] Step energy dissipation (also known as stepped energy dissipation) is a commonly used energy dissipation method in water conservancy projects. Its principle is that when water flows through steps, it produces swirl, collision, aeration and turbulence, thereby consuming water energy and reducing flow rate. Step energy dissipation is often used in spillways and overflow dams. The step structure is an "I"-shaped step. The water flow is evenly distributed on the step surface, that is, the water flow characteristics on both sides are the same as in the middle. The side walls of the spillway and overflow dam are lined with reinforced concrete. Therefore, the "I"-shaped step is fully sufficient for use. However, in the steep slope section of the gully in the mountainous area upstream of some discharge structures, it is difficult to achieve the requirements of using step energy dissipation while keeping the main stream away from the shore to reduce scouring on both sides. The traditional step shape is difficult to meet the requirements. Utility Model Content

[0003] The purpose of the utility model is to provide an arc-shaped step energy dissipation structure with higher energy dissipation effect, the main flow is located in the middle of the section, the slope scouring is reduced, the structure has good stability and the construction efficiency is improved.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] An arc-shaped step energy dissipation structure is provided with a step-like structure along the bottom of the groove. The step-like structure is composed of layers of steps, and the step-like structure is arranged step by step from upstream to downstream. Each layer of the steps includes a step plane and a step vertical surface. The step vertical surface is concave toward the inner side of the step plane so that the step vertical surface forms an arc-shaped structure.

[0006] Preferably, an arc-shaped baffle is provided on the vertical surface of the step.

[0007] Preferably, the arc-shaped baffle includes a vertical surface and a base that are integrally connected, the vertical surface is arranged in front of the vertical surface of the step, and the base is arranged at the bottom of the step.

[0008] Preferably, the base is provided with a plurality of steel bar holes at intervals along the length direction.

[0009] Preferably, both ends of the vertical surface of the upper step and the center of the vertical surface of the lower step are in the same cross section.

[0010] Preferably, the step height of the stepped structure is 0.6m to 1.0m.

[0011] The beneficial effects of the present invention are:

[0012] (1) The water flow on the steps is a three-dimensional flow, which has a higher energy dissipation effect.

[0013] (2) The main stream is located in the middle of the section, with high velocity in the middle and low velocity on the bank, which further reduces slope scour.

[0014] (3) Good structural stability: The arc-shaped baffle convex toward the upstream has better stability. At the same time, steel bars are used to pass through the steel bar holes for further fixation, further improving the structural stability.

[0015] (4) Improved construction efficiency: After the design work is completed, the curved baffle can be prefabricated in advance, and concrete can be poured after the curved baffle is fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 It is a top view of the structure of the utility model.

[0018] Figure 3 This is a view of the present invention along the slope direction (looking forward from a horizontal perspective).

[0019] Figure 4 This is a view of the present invention along the slope direction (looking forward along the slope).

[0020] Figure 5 This is a schematic diagram of the arc-shaped baffle structure of the present utility model.

[0021] Figure 6 This is a schematic diagram of the longitudinal flow pattern of the present invention (vortex along the horizontal axis in the direction of water flow).

[0022] Figure 7 This is a cross-sectional flow diagram of the present invention (vortex perpendicular to the water flow direction).

[0023] In the figure: 1, step-like structure; 2, slope; 3, step plane; 4, step vertical surface; 5, curved baffle; 51, vertical surface; 52, base; 53, steel bar hole (for reinforcement), R is the step plane radius; L is the step length; H is the step height. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0025] like Figure 1-7 As shown, the arc-shaped step energy dissipation structure includes a step-shaped structure 1 and a slope 2.

[0026] There are slopes 2 on both sides of the trench, which are natural slopes (such as rock, soil slopes, etc.) or artificial slopes. A step-like structure 1 is arranged at the bottom of the trench. The step-like structure consists of layers of steps. The step-like structure is arranged step by step from upstream to downstream. Each step includes a step plane 3 and a step vertical surface 4. The step vertical surface 4 is concave toward the inner side of the step plane 3 so that the step vertical surface 4 forms an arc-shaped structure.

[0027] Each step is poured concrete. In order to facilitate construction, arc-shaped baffles 5 can be prefabricated on the vertical surface 4 of the step before pouring to improve construction efficiency.

[0028] like Figure 5 As shown, the arc-shaped baffle 5 includes a vertical surface 51 and a base 52 that are integrally connected.

[0029] The vertical surface 51 is arranged in front of the vertical surface 4 of the step, and the base 52 is arranged at the bottom of the step. The base 52 has a plurality of steel bar holes 53 arranged at intervals along the length direction. The function of the steel bar holes 53 is to drive in steel bars to increase the structural stability.

[0030] The step length L and step height H constitute the basic dimensions of a step and determine the overall energy dissipation effect. Generally speaking, the larger the L and H, the better the energy dissipation effect. However, too large a step size will cause serious splashing. In practice, the step height H is 0.6m to 1.0m. Once the step height H is determined and the slope is known, the step length L can be determined. The step plane radius R determines the shape of the step plane 3. By adjusting the step plane radius R, Figure 2 The two ends of the vertical surface 4 of the step on the upper level and the center of the vertical surface 4 of the step on the lower level are in the same cross section.

[0031] like Figure 2 As shown, the step vertical surface 4 is an arc shape when viewed from the top view, so the step plane 3 between each two step vertical surfaces 4 presents a crescent shape. This structure makes it possible to see the step vertical surface 4 from any cross section (such as Figure 7 (As shown, the upper level of steps is on either side, and the lower level is in the middle, creating a low center and high sides layout. Water flows on both sides, forming vortices perpendicular to the main flow direction, creating a three-dimensional flow that effectively dissipates energy. Furthermore, the flow velocity is low on both sides and high in the middle, reducing scour on both banks.

[0032] like Figure 4 As shown, any section perpendicular to the slope presents a cross-section form with a low middle part and high sides, which drives the mainstream to deviate to the middle of the section, thereby reducing scouring on both sides.

[0033] like Figure 6 and Figure 7As shown, there is a transverse vortex along the mainstream direction on the step plane 3. A large amount of gas is mixed in the vortex, and energy is dissipated by shear friction between the vortex and the upper water body. On both sides of the step, lateral water flow perpendicular to the mainstream direction is generated, which increases the degree of water flow turbulence and improves the aeration and energy dissipation effects.

Claims

1. The arc-shaped step energy dissipation structure is characterized by: A step-like structure is arranged along the bottom of the groove, and the step-like structure is composed of layers of steps. The step-like structure is arranged step by step from upstream to downstream. Each layer of the steps includes a step plane and a step vertical surface. The step vertical surface is concave toward the inner side of the step plane so that the step vertical surface forms an arc-shaped structure.

2. The arc-shaped step energy dissipation structure according to claim 1, characterized in that: An arc-shaped baffle is provided on the vertical surface of the step.

3. The arc-shaped step energy dissipation structure according to claim 2, characterized in that: The arc-shaped baffle includes a vertical surface and a base that are integrally connected. The vertical surface is arranged in front of the vertical surface of the step, and the base is arranged at the bottom of the step.

4. The arc-shaped step energy dissipation structure according to claim 3, characterized in that: The base is provided with a plurality of steel bar holes at intervals along the length direction.

5. The arc-shaped step energy dissipation structure according to claim 1, characterized in that: The two ends of the vertical surface of the step of the upper layer and the center position of the vertical surface of the step of the lower layer are located in the same cross section.

6. The arc-shaped step energy dissipation structure according to any one of claims 1 to 5, characterized in that: The step height of the stepped structure is 0.6m to 1.0m.

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