J-shaped side groove spillway structure with backflow type energy dissipation structure

Abstract

The invention relates to the technical field of water conservancy projects, in particular to a J-shaped side groove spillway structure with a backflow type energy dissipation structure, which comprises an arc-shaped side groove overflow weir, an arc-shaped side groove bottom plate, an arc-shaped side groove side wall, a 7-shaped energy dissipation top plate, a trapezoidal energy dissipation pier, an arc-shaped side groove upstream retaining wall, a discharge chute front adjusting section and a discharge chute section, the upstream end of the discharge chute front adjusting section is tangent to the arc-shaped side chute, the 7-shaped energy dissipation top plate is located on the top of the side chute side wall, the J-shaped arrangement can well adapt to steep bank slope terrains, the overflow front edge length is increased while excavation of a high slope is avoided, and the discharge amount of the side chute spillway is increased. The brand-new 7-shaped energy dissipation top plate backflow type energy dissipation structure can effectively reduce the depth of the side groove and reduce the height of the side wall of the side groove on the backing side, energy is counteracted after returned water flow and water flow discharged by the arc-shaped side groove overflow weir face each other, the effects of dissipating energy and adjusting the flow state of water flow out of the groove are achieved, bias flow of the water flow out of the groove is avoided, and the service life of the water flow is prolonged. And water flow can enter the discharge chute more smoothly.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, in particular to a J-shaped side channel spillway structure with a backflow type energy dissipation structure. Background Art

[0002] The side channel spillway is a type of water discharge structure in water conservancy projects. The side channel spillway is generally arranged on the bank slope of the reservoir dam shoulder. In the past, the side channel of the side channel spillway was arranged in a straight line. When the bank slope is relatively steep, it often leads to a huge amount of side channel excavation, which cannot adapt well to the terrain and geological conditions.

[0003] In the past, when the water flow passed through the weir of the spillway, it would cause a high bulge on the side wall close to the mountain. This required deepening the side channel to prevent the water flow over the weir from flooding the outflow. After the side channel was set into an arc shape, the water flow deviation effect would aggravate the bulge on the side wall close to the mountain. This required a deeper side channel depth and a higher side wall height close to the mountain, which increased the project volume and investment. Summary of the invention

[0004] The purpose of the present invention is to provide a J-shaped side channel spillway structure with a backflow energy dissipation structure to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: a J-shaped side channel spillway structure with a backflow energy dissipation structure, comprising an arc-shaped side channel overflow weir, an arc-shaped side channel bottom plate, an arc-shaped side channel side wall, a 7-type energy dissipation top plate, a trapezoidal energy dissipation pier, an arc-shaped side channel upstream retaining wall, a chute front adjustment section and a chute section, and the spillway is an overall J-shaped structure.

[0005] The upstream end of the front adjustment section of the discharge chute is tangent to the arcuate side chute composed of the arcuate side chute overflow weir, the arcuate side chute bottom plate and the arcuate side chute side wall. The 7-type energy dissipation top plate is located on the top of the arcuate side chute side wall. The contact surface between the 7-type energy dissipation top plate and the water flow is arc-shaped and tangently connected to the arcuate side chute side wall. The trapezoidal energy dissipation piers are respectively arranged on the arcuate side chute bottom plate and the arcuate side chute side wall.

[0006] Preferably, the spillway as a whole is composed of an arc-shaped side channel overflow weir, an arc-shaped side channel bottom plate, an arc-shaped side channel side wall, a front adjustment section of the chute and a chute section, and the floodway is overall J-shaped in the plane. The J-shaped layout can better adapt to steeper bank slope terrain, avoid the excavation of high slopes, and increase the length of the overflow front edge, thereby increasing the discharge volume of the side channel spillway.

[0007] Preferably, a 7-type energy dissipation top plate is provided on the top of the side wall of the curved side trough, and the 7-type energy dissipation top plate is tangent to the side wall of the curved side trough. The contact part between the 7-type energy dissipation top plate and the water flow is arc-shaped, and the size of the arc can be determined according to the needs of the project. The arc-shaped reflux energy dissipation device of the 7-type energy dissipation top plate can effectively reduce the height of the side wall of the side trough on the mountain side. The energy of the returned water flow and the discharged water flow of the overflow weir of the curved side trough offset each other after colliding, thereby achieving the effect of energy dissipation and adjusting the flow state of the water flow out of the trough, and avoiding the deviation of the water flow out of the trough.

[0008] Preferably, the arc radius of the contact part between the type 7 energy dissipation top plate and the water flow is 0.6 to 0.7 times the maximum water head above the weir, which should be verified by hydraulic model tests.

[0009] Preferably, the center angle of the arc at the contact point between the type 7 energy dissipation top plate and the water flow is 160° to 175°, which should be verified by hydraulic model tests.

[0010] Preferably, trapezoidal energy dissipation piers are arranged on the bottom plate and side walls of the arc-shaped side troughs, and the size of the trapezoidal energy dissipation piers can be determined according to engineering needs. The trapezoidal energy dissipation piers can also achieve the functions of dissipating energy and adjusting the flow state of water out of the trough.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In the present invention, the spillway of the present invention is J-shaped as a whole in plane. The J-shaped arrangement can better adapt to steeper bank slope terrain, avoid excavation of high slopes, increase the overflow front edge length, and increase the discharge volume of the side channel spillway.

[0013] In the present invention, a new backflow energy dissipation structure is proposed, in which a 7-type energy dissipation top plate is arranged on the top of the arc-shaped side trough side wall. The arc-shaped backflow energy dissipation structure of the 7-type energy dissipation top plate can effectively reduce the depth of the side trough and reduce the height of the side trough side wall on the mountain side. The energy of the returned water flow and the water flow discharged from the overflow weir of the arc-shaped side trough offset each other after the impact, thereby achieving the effect of energy dissipation and adjusting the flow state of the water flow out of the trough, avoiding the deviation of the water flow out of the trough, and making the water flow enter the trough more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a plan view schematic diagram of the present invention;

[0015] Figure 2 is a cross-sectional view of the present invention;

[0016] Figure 3 It is a longitudinal sectional view of the present invention.

[0017] In the figure: 1. Arc-shaped side trough overflow weir; 2. Arc-shaped side trough bottom plate; 3. Arc-shaped side trough side wall; 4. 7-type energy dissipation top plate; 5. Trapezoidal energy dissipation pier; 6. Arc-shaped side trough upstream retaining wall; 7. Front adjustment section of the chute; 8. chute section. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 3 The present invention provides a technical solution: a J-shaped side channel spillway structure with a backflow energy dissipation structure, comprising an arc-shaped side channel overflow weir 1, an arc-shaped side channel bottom plate 2, an arc-shaped side channel side wall 3, a 7-type energy dissipation top plate 4, a trapezoidal energy dissipation pier 5, an arc-shaped side channel upstream retaining wall 6, a discharge chute front adjustment section 7 and a discharge chute section 8, and the spillway is an overall J-shaped structure.

[0020] The upstream end of the front adjustment section 7 of the discharge chute is tangent to the arcuate side chute composed of the arcuate side chute overflow weir 1, the arcuate side chute bottom plate 2 and the arcuate side chute side wall 3. The 7-type energy dissipation top plate 4 is located on the top of the arcuate side chute side wall 3. The contact surface between the 7-type energy dissipation top plate 4 and the water flow is arc-shaped and tangently connected to the arcuate side chute side wall 3. The trapezoidal energy dissipation pier 5 is respectively arranged on the arcuate side chute bottom plate 2 and the arcuate side chute side wall 3.

[0021] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the spillway as a whole is composed of an arc-shaped side channel overflow weir 1, an arc-shaped side channel bottom plate 2, an arc-shaped side channel side wall 3, a chute front adjustment section 7 and a chute section 8, and the spillway is overall J-shaped in plane. The J-shaped arrangement can better adapt to steeper bank slope terrain, avoid the excavation of high slopes, increase the overflow front edge length, and increase the discharge volume of the side channel spillway.

[0022] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, a 7-type energy dissipation top plate 4 is arranged on the top of the arc-shaped side trough side wall 3, and the 7-type energy dissipation top plate 4 is tangent to the arc-shaped side trough side wall 3. The contact part between the 7-type energy dissipation top plate 4 and the water flow is in an arc shape, and the size of the arc can be determined according to the engineering needs. The arc-shaped reflux energy dissipation device of the 7-type energy dissipation top plate 4 can effectively reduce the height of the side trough wall on the mountain side. The energy of the returned water flow and the water flow discharged from the overflow weir of the arc-shaped side trough is offset after the impact, so as to achieve the effect of energy dissipation and adjusting the flow state of the water flow out of the trough, avoid the deviation of the water flow out of the trough, and make the water flow enter the trough more smoothly.

[0023] In this embodiment, Figure 1 , Figure 2 and Figure 3As shown, the arc radius of the contact part between the type 7 energy dissipation top plate 4 and the water flow is 0.6 to 0.7 times the maximum water head above the weir, which should be verified by hydraulic model tests.

[0024] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the arc center angle of the contact part between the type 7 energy dissipation top plate 4 and the water flow is 160° to 175°, which should be verified by hydraulic model test.

[0025] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the arc-shaped side channel bottom plate 2 and the arc-shaped side channel side wall 3 are provided with a trapezoidal energy dissipation pier 5, and the size of the trapezoidal energy dissipation pier 5 can be determined according to the engineering requirements. The trapezoidal energy dissipation pier 5 can also achieve the function of dissipating energy and adjusting the flow state of the water flow out of the channel.

[0026] The working process of this J-shaped side channel spillway structure with a backflow energy dissipation structure is as follows:

[0027] S1: Determine the overall axis of the spillway and the top elevation, arc radius and arc length of the arc side channel overflow weir 1 according to the project topographic and geological conditions, project characteristic water level and discharge capacity;

[0028] S2: Determine the width of the head end of the arc-shaped side channel bottom plate 2, the front adjustment section 7 of the chute (the end of the arc-shaped side channel bottom plate 2) and the chute section 8 according to the discharge flow of the side channel spillway, topographic and geological conditions and engineering experience.

[0029] S3: Based on the calculation results of the water surface line, preliminarily determine the top elevations of the first and last ends of the arc-shaped side trough bottom plate and the bottom slope i0. Generally, i0≤ik is required, where ik is the critical water depth of the side trough.

[0030] S4: The preliminary proposed top elevation of the arc-shaped side trough side wall 3, the size of the 7-type energy dissipation top plate 4 and the trapezoidal energy dissipation pier 5.

[0031] S5: Conduct hydraulic model tests to optimize the top elevation and bottom slope of the arc-shaped side trough bottom plate 2, the top elevation of the arc-shaped side trough side wall 3, the size of the type 7 energy dissipation top plate 4 and the trapezoidal energy dissipation pier 5, and select the optimal size.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A J-shaped side channel spillway structure with a backflow energy dissipation structure, comprising an arc-shaped side channel overflow weir (1), an arc-shaped side channel bottom plate (2), an arc-shaped side channel side wall (3), a 7-shaped energy dissipation top plate (4), a trapezoidal energy dissipation pier (5), an arc-shaped side channel upstream retaining wall (6), a discharge channel front adjustment section (7) and a discharge channel section (8), characterized in that: The spillway is in a J-shaped structure as a whole; The upstream end of the discharge chute front adjustment section (7) is tangent to the arcuate side chute composed of the arcuate side chute overflow weir (1), the arcuate side chute bottom plate (2) and the arcuate side chute side wall (3); the 7-type energy dissipation top plate (4) is located on the top of the arcuate side chute side wall (3); the 7-type energy dissipation top plate (4) has an arc-shaped contact surface with the water flow and is tangently connected to the arcuate side chute side wall (3); the trapezoidal energy dissipation pier (5) is respectively arranged on the arcuate side chute bottom plate (2) and the arcuate side chute side wall (3).

2. A J-shaped side channel spillway structure with a backflow energy dissipation structure according to claim 1, characterized in that: The spillway as a whole is composed of an arc-shaped side channel overflow weir (1), an arc-shaped side channel bottom plate (2), an arc-shaped side channel side wall (3), a chute front adjustment section (7) and a chute section (8), and the spillway is overall J-shaped in plane. The J-shaped arrangement can better adapt to steeper bank slope terrain, avoid the excavation of high slopes, increase the overflow front edge length, and increase the discharge volume of the side channel spillway.

3. The J-shaped side channel spillway structure with a backflow energy dissipation structure according to claim 1, characterized in that: A 7-type energy dissipation top plate (4) is arranged on the top of the arc-shaped side channel side wall (3), and the 7-type energy dissipation top plate (4) is tangent to the arc-shaped side channel side wall (3). The contact part between the 7-type energy dissipation top plate (4) and the water flow is in an arc shape, and the arc size can be determined according to the engineering needs. The 7-type energy dissipation top plate arc-shaped return flow energy dissipation device can effectively reduce the height of the side channel side wall on the mountain side. After the return water flow and the downstream water flow of the arc-shaped side channel overflow weir collide, the energy is offset by each other, so as to achieve the effect of energy dissipation and adjusting the flow state of the outflow water flow, and avoid the outflow water flow deviation.

4. The J-shaped side channel spillway structure with a backflow energy dissipation structure according to claim 1, characterized in that: Trapezoidal energy dissipation piers (5) are arranged on the arc-shaped side channel bottom plate (2) and the arc-shaped side channel side wall (3), and the size of the trapezoidal energy dissipation piers (5) can be determined according to the engineering requirements. The trapezoidal energy dissipation piers (5) can also achieve the functions of energy dissipation and adjusting the flow state of water out of the channel.

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