Combined type gravity dam structure with flow picking and energy dissipation

Abstract

The utility model relates to a combined gravity dam structure of pick-up flow energy dissipation, and is suitable for the technical field of hydroelectric and hydraulic engineering. The utility model adopts the technical scheme of: a combined gravity dam structure of pick-up flow energy dissipation has: a dam body, the flow channel structure that is provided with the dam body upper and lower reaches is set up on the dam body, and the water flow of the upstream of the dam body can flow to the downstream of the dam body through the flow channel structure, and the flow channel structure has first flow channel structure and second flow channel structure; the first flow channel structure is arranged on the dam body, and the tailgate of first flow channel structure is set up in the end; the second flow channel structure is arranged on the dam body, and the tailgate of second flow channel structure is set up in the end; the first flow channel structure and the second flow channel structure are alternately arranged on the dam body, and the elevation of the end of the first tailgate is higher than the elevation of the end of the second tailgate.

Description

Technical Field

[0001] This utility model relates to a combined gravity dam structure for flow dissipation. It is applicable to the field of hydropower and water conservancy engineering technology. Background Technology

[0002] Due to its advantages such as simple structure, high cost and efficiency, and strong adaptability, the diversion flow energy dissipation method has become the mainstream choice for gravity dam flood discharge energy dissipation, especially suitable for projects with high water head and good rock foundation conditions.

[0003] Although gravity dams offer the aforementioned advantages in energy dissipation through spillway discharge, many operational projects have experienced issues such as poor flow patterns on the dam face and excessively concentrated jetting flow during flood discharge operations. This results in reduced operational flexibility and severe downstream scouring. The main reasons for these problems are: ① The lack of independent partitions between each spillway orifice and the tailrace, leading to lateral flow on the overflow dam face when some orifices are open, creating unfavorable flow patterns; ② Generally, the tailraces following each set of spillways in gravity dams are low tailraces with identical spillway distances, resulting in excessively concentrated incident flow that fails to fully utilize the downstream energy dissipation water, leading to severe scouring. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to solve the above-mentioned technical problem, this utility model provides a combined gravity dam structure for flow dissipation.

[0005] The technical solution adopted in this utility model is: a combined gravity dam structure for flow dissipation, which has the following characteristics: The dam body has a flow channel structure that connects the upstream and downstream sides of the dam body. Water from the upstream side of the dam body can flow to the downstream side of the dam body through the flow channel structure. The flow channel structure has a first flow channel structure and a second flow channel structure. The first flow channel structure is arranged on the dam body, and the first tail sill is set at the end of the first flow channel structure. The second flow channel structure is arranged on the dam body, and a second tail sill is set at the end of the second flow channel structure. The first and second flow channel structures are arranged alternately on the dam body, with the elevation of the end of the first tail sill being higher than that of the end of the second tail sill.

[0006] An odd number of flow channel structures are provided on the dam body, and the flow channel structures located at both ends of the dam body are the second flow channel structures.

[0007] Adjacent flow channel structures are separated by flow channel sidewalls.

[0008] The flow channel surface of the first flow channel structure in the longitudinal section of the first flow channel structure is a WES curve. The flow channel surface of the first flow channel structure is provided with a first curved section, a first straight section, a first reverse arc section and a first draft section in sequence from upstream to downstream. The first tail sill is arranged at the end of the first draft section. The flow channel surface of the second flow channel structure in the longitudinal section of the second flow channel structure is a WES curve. The flow channel surface of the second flow channel structure is provided with a second curved section, a second reverse arc section and a second jet section in sequence from upstream to downstream. The second tail sill is arranged at the end of the second jet section.

[0009] In the longitudinal section of the flow channel structure, both the first and second reverse arc segments are circular arcs, and the first and second reverse arc segments differ in radius and angle. The above are all the same.

[0010] The angle between the first and second reverse arc segments .

[0011] In the longitudinal section of the flow channel structure, both the first and second drafting sections are circular arcs, and they have the same radius. The angle of the arc of the first drafting section is... Angle greater than the arc of the second jet section .

[0012] The angle of the arc of the first jet section The angle of the arc of the second jet section .

[0013] The end of the first tail sill extends outward from the side wall of the flow channel and is positioned upward. The end of the second tail sill is positioned inward from the side wall of the flow channel and is positioned downward.

[0014] The slope ratio of the first straight segment is 1:0.75.

[0015] The beneficial effects of this utility model are as follows: This utility model sets a first straight section on the first flow channel structure and makes the angle of the first jet section on the first flow channel structure greater than the angle of the second jet section on the second flow channel structure, thus making the length of the first flow channel structure greater than the length of the second flow channel structure. This utility model sets a first tail sill at the end of the first flow channel structure and a second tail sill at the end of the second flow channel structure, making the height of the first tail sill higher than the second tail sill, thus making the tail sill of the first flow channel structure higher than the tail sill of the second flow channel structure. This utility model achieves an alternating arrangement of "long flow channel overlapping high tail sill + short flow channel overlapping low tail sill" by alternating the arrangement of the first and second flow channel structures, enabling the dam body to form a laterally dispersed and longitudinally extended jetting flow during flood discharge operation, which can fully utilize the downstream water body to balance energy dissipation and reduce scouring of the energy dissipation zone. This utility model separates each flow channel structure by setting flow channel sidewalls between adjacent flow channel structures, making each flow channel structure independent, and making the water flow smoother when the orifices of any flow channel structure are opened, thus making flood discharge operation more flexible. Attached Figure Description

[0016] Figure 1: A schematic diagram of the structure of this utility model.

[0017] Figure 2 : A schematic diagram of the structure of this utility model.

[0018] Figure 3 : Figure 2 Cross-sectional view at point AA.

[0019] Figure 4 : Figure 2 Cross-sectional view at point BB.

[0020] In the diagram: 1. Dam body; 2. First flow channel structure; 2-1. First curved section; 2-2. First straight section; 2-3. First reverse arc section; 2-4. First jet section; 2-5. First tail sill; 3. Second flow channel structure; 3-1. Second curved section; 3-2. Second reverse arc section; 3-3. Second jet section; 3-4. Second tail sill; 4. Flow channel sidewall. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0022] Example 1 is a combined gravity dam structure for flow dissipation. In this example, it has: Dam body 1, with a flow channel structure connecting the upstream and downstream of dam body 1. Water flow from upstream of dam body 1 can flow to downstream of dam body 1 through the flow channel structure. The flow channel structure has a first flow channel structure 2 and a second flow channel structure 3. The first flow channel structure 2 is arranged on the dam body 1, and the end of the first flow channel structure 2 is provided with the first tail sill 2-5; The second flow channel structure 3 is arranged on the dam body 1, and the end of the second flow channel structure 3 is provided with a second tail sill 3-4; The first flow channel structure 2 and the second flow channel structure 3 are alternately arranged on the dam body 1, with the elevation of the end of the first tail sill 2-5 being higher than the elevation of the end of the second tail sill 3-4. Thus, because the elevation of the first tail sill 2-5 at the end of the first flow channel structure 2 is higher than the elevation of the second tail sill 3-4 at the end of the second flow channel structure 3, the water flow height from the end of the first flow channel structure 2 is higher than the water flow height from the end of the second flow channel structure 3. This longitudinally separates the jetting water flow, and by alternating the arrangement of the first flow channel structure 2 and the second flow channel structure 3, the jetting water flow is dispersed laterally, alleviating the problem of excessive concentration of the jetting water flow.

[0023] In this embodiment, an odd number of flow channel structures are provided on the dam body 1, and the flow channel structures arranged at both ends of the dam body 1 are the second flow channel structures 3.

[0024] In this embodiment, adjacent flow channel structures are separated by flow channel sidewalls 4, which are made of concrete. This makes each flow channel structure independent, allowing for smoother water flow when the orifices of any flow channel structure are opened, and providing greater flexibility in flood discharge operations.

[0025] Example 2 is a combined gravity dam structure for flow dissipation. Based on Example 1, in this example, the flow surface of the first flow channel structure 2 in the longitudinal section of the first flow channel structure 2 is a WES curve. The flow surface of the first flow channel structure 2 is provided with a first curved segment 2-1, a first straight segment 2-2, a first reverse arc segment 2-3 and a first flow dissipation segment 2-4 in sequence from upstream to downstream. The first tail sill 2-5 is arranged at the end of the first flow dissipation segment 2-4.

[0026] The flow channel surface of the second flow channel structure 3 in the longitudinal section of the second flow channel structure 3 is a WES curve. The flow channel surface of the second flow channel structure 3 is provided with a second curve segment 3-1, a second reverse arc segment 3-2 and a second draft segment 3-3 in sequence from upstream to downstream. The second tail sill 3-4 is arranged at the end of the second draft segment 3-3.

[0027] In the longitudinal section of the flow channel structure, both the first reverse arc segment 2-3 and the second reverse arc segment 3-2 are circular arcs, and the first reverse arc segment 2-3 and the second reverse arc segment 3-2 are similar in radius and angle. The above are all the same.

[0028] The angle between the first reverse arc segment 2-3 and the second reverse arc segment 3-2 .

[0029] In the longitudinal section of the flow channel structure, both the first drafting section 2-4 and the second drafting section 3-3 are circular arcs. The first drafting section 2-4 and the second drafting section 3-3 have the same radius. The angle of the arc of the first drafting section 2-4 is... Angle greater than the 3-3 arc of the second jet section The slope ratio of the first straight segment 2-2 is 1:0.75. Thus, the angle between the first straight segment 2-2 and the arc of the first jet section 2-4 on the first flow channel structure 2... Angle greater than the 3-3 arc of the second jet section Under this action, the length of the first flow channel structure 2 is longer than that of the second flow channel structure 3. The end of the first tail sill 2-5 extends outside the flow channel sidewall 4, while the end of the second tail sill 3-4 is inside the flow channel sidewall 4. The end of the first tail sill 2-5 is arranged upwards, and the end of the second tail sill 3-4 is arranged downwards. This achieves an alternating arrangement of "long flow channel overlapping with high tail sill + short flow channel overlapping with low tail sill," which has a better effect on longitudinally widening the jetting water flow.

[0030] In this embodiment: the angle of the first flow-lifting section 2-4 arc, the angle of the second flow-lifting section 3-3 arc... .

[0031] Example 3 is a combined gravity dam structure for flow dissipation. In this example, it has: Dam body 1, with a flow channel structure connecting the upstream and downstream of dam body 1. Water flow from upstream of dam body 1 can flow to downstream of dam body 1 through the flow channel structure. The flow channel structure has a first flow channel structure 2 and a second flow channel structure 3. The first flow channel structure 2 is arranged on the dam body 1, and the end of the first flow channel structure 2 is provided with the first tail sill 2-5; The second flow channel structure 3 is arranged on the dam body 1, and the end of the second flow channel structure 3 is provided with a second tail sill 3-4; The first flow channel structure 2 and the second flow channel structure 3 are arranged alternately on the dam body 1, and the elevation of the end of the first tail sill 2-5 is higher than the elevation of the end of the second tail sill 3-4.

[0032] An odd number of flow channel structures are provided on the dam body 1, and the flow channel structures arranged at both ends of the dam body 1 are the second flow channel structures 3.

[0033] The two adjacent flow channel structures are separated by the flow channel sidewall 4.

[0034] The flow channel surface of the first flow channel structure 2 in the longitudinal section of the first flow channel structure 2 is a WES curve. The flow channel surface of the first flow channel structure 2 is provided with a first curved segment 2-1, a first straight segment 2-2, a first reverse arc segment 2-3 and a first draft segment 2-4 in sequence from upstream to downstream. The first tail sill 2-5 is arranged at the end of the first draft segment 2-4. The flow channel surface of the second flow channel structure 3 in the longitudinal section of the second flow channel structure 3 is a WES curve. The flow channel surface of the second flow channel structure 3 is provided with a second curve segment 3-1, a second reverse arc segment 3-2 and a second draft segment 3-3 in sequence from upstream to downstream. The second tail sill 3-4 is arranged at the end of the second draft segment 3-3.

[0035] In the longitudinal section of the flow channel structure, both the first reverse arc segment 2-3 and the second reverse arc segment 3-2 are circular arcs, and the first reverse arc segment 2-3 and the second reverse arc segment 3-2 are similar in radius and angle. The above are all the same.

[0036] The angle between the first reverse arc segment 2-3 and the second reverse arc segment 3-2 .

[0037] In the longitudinal section of the flow channel structure, both the first drafting section 2-4 and the second drafting section 3-3 are circular arcs. The first drafting section 2-4 and the second drafting section 3-3 have the same radius. The angle of the arc of the first drafting section 2-4 is... Angle greater than the 3-3 arc of the second jet section .

[0038] The angle of the first flow section 2-4 arc The angle of the second jet section 3-3 arc .

[0039] The end of the first tail sill 2-5 extends outward from the side wall 4 of the flow channel and is arranged upward. The end of the second tail sill 3-4 is inside the side wall 4 of the flow channel and is arranged downward.

[0040] The slope ratio of the first straight segment 2-2 is 1:0.75.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A combined gravity dam structure for flow dissipation, characterized in that: have: The dam body (1) has a flow channel structure that connects the upstream and downstream of the dam body (1). The water flow upstream of the dam body (1) can flow to the downstream of the dam body (1) through the flow channel structure. The flow channel structure has a first flow channel structure (2) and a second flow channel structure (3). The first flow channel structure (2) is arranged on the dam body (1), and the end of the first flow channel structure (2) is provided with the first tail sill (2-5). The second flow channel structure (3) is arranged on the dam body (1), and the end of the second flow channel structure (3) is provided with a second tail sill (3-4). The first flow channel structure (2) and the second flow channel structure (3) are arranged alternately on the dam body (1), and the elevation of the end of the first tail sill (2-5) is higher than the elevation of the end of the second tail sill (3-4).

2. The gravity dam structure for combined flow dissipation according to claim 1, characterized in that: An odd number of flow channel structures are provided on the dam body (1), and the flow channel structures arranged at both ends of the dam body (1) are the second flow channel structures (3).

3. The gravity dam structure for combined flow dissipation according to claim 1, characterized in that: The two adjacent flow channel structures are separated by the flow channel sidewall (4).

4. The gravity dam structure for combined flow dissipation according to claim 1, characterized in that: The first flow channel structure (2) has a first curved section (2-1), a first straight section (2-2), a first reverse arc section (2-3), and a first draft section (2-4) arranged sequentially from upstream to downstream on the flow channel surface, and the first tail sill (2-5) is arranged at the end of the first draft section (2-4); The flow channel surface of the second flow channel structure (3) is provided with a second curved section (3-1), a second reverse arc section (3-2), and a second draft section (3-3) in sequence from upstream to downstream. The second tail sill (3-4) is arranged at the end of the second draft section (3-3).

5. A combined gravity dam structure for flow dissipation according to claim 4, characterized in that: In the longitudinal section of the flow channel structure, both the first reverse arc segment (2-3) and the second reverse arc segment (3-2) are circular arcs. The first reverse arc segment (2-3) and the second reverse arc segment (3-2) are similar in radius and angle. The above are all the same.

6. A combined gravity dam structure for flow dissipation according to claim 5, characterized in that: The angle between the first reverse arc segment (2-3) and the second reverse arc segment (3-2) .

7. A combined gravity dam structure for flow dissipation according to claim 4, characterized in that: In the longitudinal section of the flow channel structure, both the first draft section (2-4) and the second draft section (3-3) are circular arcs. The first draft section (2-4) and the second draft section (3-3) have the same radius. The angle of the arc of the first draft section (2-4) is... Angle greater than the arc of the second jet section (3-3) .

8. A combined gravity dam structure for flow dissipation according to claim 7, characterized in that: The angle of the arc of the first flow section (2-4) The angle of the arc of the second jet section (3-3) .

9. A combined gravity dam structure for flow dissipation according to claim 7, characterized in that: The end of the first tail sill (2-5) is outside the flow channel sidewall (4) and the end of the first tail sill (2-5) is arranged upward. The end of the second tail sill (3-4) is inside the flow channel sidewall (4) and the end of the second tail sill (3-4) is arranged downward.

10. A combined gravity dam structure for flow dissipation according to claim 4, characterized in that: The slope ratio of the first straight segment (2-2) is 1:0.75.

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