Stilling basin tail sill structure based on circular arc and reverse slope and stilling basin

Abstract

The utility model provides a stilling pool tail sill structure based on an arc and a reverse slope and a stilling pool, belongs to the technical field of water conservancy and hydropower engineering, and aims to avoid frequent maintenance of the stilling pool due to accumulation of large-particle bed loads and easiness in damage of a tail sill. The first tail ridge section and the second tail ridge section are connected in sequence; wherein the first tail ridge section is used for being connected with a stilling pool bottom plate section, and compared with the first tail ridge section, the stilling pool bottom plate section is closer to the water flow inlet; wherein the water flow bearing surface of the stilling pool bottom plate section is a flat surface, the water flow bearing surface of the first tail sill section is an arc surface which is sunken towards one side deviating from the water flow bearing surface, and the water flow bearing surface of the second tail sill section is an inclined surface which is sequentially raised in the direction from the water flow inlet to the outflow river channel. The height of the highest position of the second tail ridge section is smaller than or equal to the height of the riverbed surface of the outflow river channel.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of water conservancy and hydropower engineering, and in particular to a stilling pool tail sill structure and a stilling pool based on an arc and a reverse slope. Background Art

[0002] At present, stilling basins are frequently used in water conservancy projects as energy dissipation facilities that cause bottom flow water jumps downstream of discharge structures.

[0003] However, the energy dissipation pool currently used is difficult to discharge large particles of bed load, and its tail sill structure is easily damaged, which leads to the need for frequent maintenance of the energy dissipation pool and consumes human resources. Utility Model Content

[0004] The embodiment of the present application is to provide a stilling pool tail sill structure and a stilling pool based on an arc and a reverse slope, so as to solve the problem that large-particle bed load in the current stilling pool is difficult to discharge and the tail sill is easily damaged, resulting in frequent maintenance of the stilling pool.

[0005] In a first aspect, an embodiment of the present application provides a stilling pool tail sill structure based on a circular arc and a reverse slope, comprising:

[0006] A first tail sill section and a second tail sill section are arranged between the water inlet and the outflow channel and are connected in sequence; wherein the first tail sill section is used to connect with the stilling pool bottom plate section, and the stilling pool bottom plate section is closer to the water inlet than the first tail sill section;

[0007] Among them, the water flow bearing surface of the bottom plate section of the energy dissipation pool is a flat surface, the water flow bearing surface of the first tail sill section is an arc surface recessed toward the side away from the water flow bearing surface, and the water flow bearing surface of the second tail sill section is an inclined surface that rises sequentially in the direction from the water flow inlet to the outflow channel, and the height of the highest point of the second tail sill section is less than or equal to the height of the riverbed surface of the outflow channel.

[0008] Furthermore, it also includes a guardrail section connected to the second tail sill section, and the height of the water flow bearing surface of the guardrail section is level with the height of the highest point of the second tail sill section.

[0009] Furthermore, the radius of the arc surface is greater than twice the height of the tail sill; wherein the height of the tail sill is the height difference between the water flow bearing surface of the stilling pool bottom plate section and the vertex of the arc surface.

[0010] Furthermore, the first tail sill section includes an arc section and a tail sill top section connected in sequence, the water flow bearing surface of the arc section is the arc surface, the water flow bearing surface of the tail sill top section is a horizontal plane, and the height of the water flow bearing surface of the tail sill top section is level with the height of the vertex of the arc surface.

[0011] Furthermore, an angle formed by a tangent line at a connection point between the vertex of the arc surface and the top section of the tail sill and a vertical line is less than 45°.

[0012] Furthermore, the width of the tail sill top section is 1m.

[0013] Furthermore, the slope ratio of the inclined surface is between 10% and 25%.

[0014] A second aspect of an embodiment of the present application provides an energy dissipation pool, comprising: the energy dissipation pool tail sill structure based on circular arc and reverse slope as described in the first aspect above.

[0015] The present application provides a stilling pool tail sill structure based on circular arc and reverse slope, comprising: a first tail sill section and a second tail sill section which are arranged between a water inlet and an outflow channel and are connected in sequence; wherein the first tail sill section is used to connect with a stilling pool bottom plate section, and the stilling pool bottom plate section is closer to the water inlet than the first tail sill section; wherein the water flow bearing surface of the stilling pool bottom plate section is a flat surface, the water flow bearing surface of the first tail sill section is an arc surface which is concave toward a side away from the water flow bearing surface, and the water flow bearing surface of the second tail sill section is an inclined surface which rises in sequence in the direction from the water inlet to the outflow channel, and the height of the highest point of the second tail sill section is less than or equal to the height of the riverbed surface of the outflow channel;

[0016] Therefore, the present application, on the one hand, by adopting a first tail sill section whose water flow bearing surface is a smooth arc surface, alleviates the impact and destructive effect of large-particle bed load in the river channel on the first tail sill section when being driven by the water flow, reduces the impact force of the bed load, and reduces the damage risk of the first tail sill section; on the other hand, by adopting an upwardly inclined second tail sill section, it plays a water buffering role on the outflowing water flow so that the water flow can flow out of the energy stilling pool smoothly, reduces the scouring of the second tail sill section by the water flow, and reduces the damage risk of the second tail sill section; in this way, the damage risk of the tail sill structure of the energy stilling pool is reduced from two aspects, thereby avoiding the problem of damage to the energy stilling pool due to damage to the tail sill structure; at the same time, the first tail sill section with a smooth arc surface and the second tail sill section with an inclined surface are adopted to facilitate the discharge of large-particle bed load from the energy stilling pool, avoid the accumulation of bed load in the energy stilling pool, and reduce the performance effect of the energy stilling pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 The structural schematic diagram of the stilling pool in the related art is shown;

[0019] Figure 2A schematic structural diagram of the tail sill structure of the stilling pool provided in an embodiment of the present application is shown;

[0020] Figure 3 A top view of the stilling pool tail sill structure provided in an embodiment of the present application is shown;

[0021] Description of reference numerals:

[0022] 1. First tail sill section; 11. Arc section; 12. Tail sill top section; 2. Second tail sill section; 3. Energy dissipation pool bottom plate section; 4. Tank protection section; 1', tail sill; 11', first slope surface; 12', horizontal surface; 13', second slope surface. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The energy dissipation pool is an energy dissipation facility located downstream of the water discharge structure of the water conservancy facility. It is used to generate an underflow hydraulic jump to dissipate the energy of the water flow. It can change the downstream water flow from a rapid flow to a slow flow, reducing the scouring effect on the river channel. The tail sill of the energy dissipation pool is an important part of the energy dissipation pool, and its structure has a great influence on the energy dissipation effect of the energy dissipation pool.

[0025] In the related art, the structure of the stilling pool refers to Figure 1 , which shows a schematic diagram of the structure of the stilling pool in the related art. Figure 1 It can be seen that the energy dissipation pool includes a chute section, an energy dissipation pool bottom plate section, a tail sill and a tank protection section which are arranged in sequence, wherein the chute section is connected to the water inlet, and the tank protection section is connected to the downstream river channel. From the water inlet to the downstream river channel, the tail sill 1' includes an upwardly inclined first slope surface 11', a horizontal surface 12' and a downwardly inclined second slope surface 13', wherein the first slope surface 11', the horizontal surface 12' and the second slope surface 13' are connected in sequence.

[0026] When the stilling basin is used for water flow energy dissipation, the water flow carries the bed load toward the tail sill 1', and the bed load will collide with the tail sill 1' as the water flow moves. After the water flow passes the horizontal plane 12', the height difference between the horizontal plane and the downstream river channel will cause the water flow to pour downstream. In this process, the water flow will inevitably wash the second slope surface 13', making the tail sill of the stilling basin vulnerable to impact and washing and damage. At the same time, due to the large slope of the first slope surface 11', it is difficult for large particles of bed load to cross the tail sill and enter the downstream river channel, which causes the large particles of bed load to accumulate in the bottom plate section of the stilling basin, and the stilling basin needs frequent maintenance to maintain its effectiveness.

[0027] In view of this, the present application provides a stilling pool tail sill structure and a stilling pool based on an arc and a reverse slope, which alleviates the impact of the bed load on the tail sill by adopting an arc surface, and alleviates the scouring of the tail sill by the water flow by an upward inclined surface, thereby reducing the risk of damage to the tail sill; at the same time, the use of a smooth arc surface and an upward inclined surface can help large-particle bed load to smoothly enter the downstream river channel, facilitate the discharge of large-particle bed load from the stilling pool, and thereby avoid the situation where the stilling pool needs frequent maintenance to maintain its effectiveness.

[0028] Specifically, refer to Figure 2 , shows a schematic structural diagram of the stilling pool tail sill structure based on arc and reverse slope provided in an embodiment of the present application, such as Figure 2 As shown in FIG. 1 , the tail sill structure of the stilling pool specifically includes:

[0029] A first tail sill section 1 and a second tail sill section 2 are arranged between the water inlet and the outflow channel and are connected in sequence; wherein the first tail sill section 1 is used to connect with the stilling pool bottom plate section 3, and the stilling pool bottom plate section 3 is closer to the water inlet than the first tail sill section 1;

[0030] Among them, the water flow bearing surface of the energy dissipation pool bottom plate section 3 is a flat surface, the water flow bearing surface of the first tail sill section 1 is an arc surface recessed toward the side away from the water flow bearing surface, and the water flow bearing surface of the second tail sill section 2 is an inclined surface that rises sequentially in the direction from the water flow inlet to the outflow channel, and the height of the highest point of the second tail sill section 2 is less than or equal to the height of the riverbed surface of the outflow channel.

[0031] In this embodiment, the tail sill structure of the energy dissipation pool is arranged between the water inlet and the outflow channel. It mainly cooperates with the energy dissipation pool to transform the upstream rapids into slow currents and then flow into the downstream from the outflow channel, thereby avoiding the erosion and damage of the river bank by the turbulent water flow, shortening the length of the tank protection section, and reducing the project cost.

[0032] Among them, the water flow bearing surface of the energy dissipation pool bottom plate section 3 can be a horizontal plane or an inclined plane; when the water flow bearing surface of the energy dissipation pool bottom plate section 3 is a horizontal plane, it can facilitate the discharge of the bed load and reduce the accumulation of the bed load in the energy dissipation pool; when the water flow bearing surface of the energy dissipation pool bottom plate section 3 is an inclined plane, it can make the water flow form a stable water jump and improve the energy dissipation effect of the energy dissipation pool.

[0033] The water flow bearing surface of the first tail sill section 1 may include a concave arc surface, or may include an arc surface and a horizontal surface connected to the vertex of the arc surface; when the water flow bearing surface is an arc surface, the water flow bearing surface of the second tail sill section 2 may be set to a relatively gentle inclined surface to avoid the situation where the bed load rolls back to the energy dissipation pool bottom plate section 3 from the tail sill due to gravity; if the water flow bearing surface includes an arc surface and a horizontal surface connected to the vertex of the arc surface, the slope ratio of the water flow bearing surface of the second tail sill section 2 may be set to a larger slope ratio to ensure the energy dissipation effect of the energy dissipation pool while ensuring the smooth discharge of the bed load.

[0034] The water flow bearing surface of the second tail sill section 2 is an inclined surface that slopes upward from the upstream to the downstream direction of the water flow. One end of the inclined surface is connected to the vertex of the first tail sill section 1, and the other end is connected to the riverbed surface of the downstream river channel, so that the water flow can flow smoothly into the downstream river channel and reduce the scouring effect of the water flow on the tail sill.

[0035] Among them, the first tail sill section 1 is a smooth arc surface that can facilitate the movement of large-particle bed load with the water flow, so that the large-particle bed load can cross the first tail sill section 1. Since the slope surface of the second tail sill section 2 is gentler than the slope surface in the related technology and the moving distance of the bed load is not too long, the large-particle bed load can cross the second tail sill section 2 and enter the downstream river channel. Therefore, large-particle bed load will not accumulate in the energy dissipation pool, which is convenient for maintaining the energy dissipation effect of the energy dissipation pool.

[0036] It is understandable that in the first tail sill section 1, the curvature of the arc surface cannot be too large. If the curvature of the arc surface is too large, it will hinder the discharge of the bed load, causing the bed load to be retained in the bottom plate section 3 of the energy dissipation pool, reducing the energy dissipation effect of the energy dissipation pool, and requiring human resources to clean up the deposits; the curvature of the arc surface cannot be too small. If the arc surface is too small, it will be difficult to alleviate the impact of the bed load and increase the probability of damage to the tail sill. Similarly, in the second tail sill section 2, the slope of the inclined surface cannot be too small. Too small a slope makes the water flow backflow difficult and reduces the energy dissipation effect of the energy dissipation pool; the slope of the inclined surface cannot be too large. Too large a slope will make the thrust of the water flow on the bed load smaller than the gravity of the bed load, making it impossible to discharge the bed load from the energy dissipation pool, reducing the energy dissipation effect of the energy dissipation pool.

[0037] Specifically, the tail sill structure of the energy dissipation pool is mainly composed of the energy dissipation pool bottom plate section 3, the first tail sill section 1 and the second tail sill section 2. The energy dissipation pool bottom plate section 3 is a flat surface, which is used to carry the turbulent water flow entering from the water flow inlet, and the water flow itself will surge to the end of the energy dissipation pool bottom plate section 3; the first tail sill section 1 is an arc surface that is concave to the side away from the water flow bearing surface, that is, the first tail sill section 1 gradually rises to an arc, and then when the turbulent water flow surges from the energy dissipation pool bottom plate section 3 to the first tail sill section 1, it will be blocked by the arc surface of the first tail sill section 1 and a water jump will be generated, thereby realizing backflow energy dissipation; at the same time, since there are often bed loads in the water flow, such as mud, sand, stones, etc., they enter the energy dissipation pool with the water flow. When the water flow is blocked by the arc surface and a water jump is generated, it pushes the bed load to move along the arc surface. Due to the buffering effect of the arc surface, the impact of the bed load on the tail sill is relatively small during the movement of the bed load.

[0038] Then, after the water flow changes from a rapid flow to a slow flow, it gradually overflows the top of the first tail sill section 1, flows through the second tail sill section 2 and then flows to the outflow channel, and pushes the retained bed load to move, and then is discharged from the stilling pool with the water flow. Among them, setting the second tail sill section 2 as a relatively gentle inclined surface can make the bed load move to the outflow channel, and will not roll back to the bottom plate section 3 of the stilling pool, thereby avoiding the accumulation of bed load on the bottom plate section 3 of the stilling pool.

[0039] In one embodiment, referring to Figure 3 , Figure 3 The top view of the stilling pool tail sill structure based on the arc and reverse slope provided in the embodiment of the present application is shown. Figure 3 It can be seen that the width of the water flow bearing surface of the energy dissipation pool bottom plate section 3, the width of the water flow bearing surface of the first tail sill section 1 and the width of the water flow bearing surface of the second tail sill section 2 are all consistent. The width represents the distance between the two side walls of the energy dissipation pool. The specific setting of the width depends on the actual situation.

[0040] The energy dissipation pool tail sill structure based on arc and reverse slope provided in the embodiment of the present application designs the energy dissipation pool tail sill structure to include a first tail sill section 1 with an arc surface and a second tail sill section 2 with an inclined surface. The arc surface is used to alleviate the impact of the bed load on the tail sill. The height of the riverbed surface of the outflowing river channel is connected by the upward inclined surface to avoid the scouring effect of the water flow on the tail sill. The first tail sill section 1 and the second tail sill section 2 are combined to achieve smooth discharge of large-particle bed load carried by the water flow from the energy dissipation pool, thereby maintaining the energy dissipation effect of the energy dissipation pool without frequent maintenance of the energy dissipation pool, thereby reducing the waste of human resources.

[0041] In one embodiment, considering that the arc surface of the first tail sill section 1 and the inclined surface of the second tail sill section 2 will affect the energy dissipation effect of the stilling basin and whether the bed load can be discharged, for the first tail sill section 1, the radius of the arc surface is set to be greater than twice the height of the tail sill; for the second tail sill section 2, the slope ratio of the inclined surface is set to be between 10% and 25%.

[0042] For example, the slope ratio of the inclined surface of the second tail step section 2 may be 10%, 15%, 20%, or 25%, etc.

[0043] The tail sill height is the height difference between the water flow bearing surface of the stilling pool bottom plate section 3 and the vertex of the arc surface, and the slope ratio represents the ratio between the vertical height and the horizontal width of the inclined surface.

[0044] Specifically, the radius R of the arc surface of the first tail sill section 1 is set to be greater than twice the tail sill height H. The formed arc surface can provide a relatively smooth arc surface for the bed load, which can better alleviate the impact of the bed load on the tail sill. The smooth arc surface can facilitate the water flow to push the bed load to move toward the apex of the arc surface, thereby facilitating the discharge of the bed load from the energy dissipation pool.

[0045] The slope ratio of the inclined surface of the second tail sill section 2 is set between 10% and 25%. Within this range, the inclined surface is relatively gentle, which can block the hydraulic jump of some turbulence and facilitate the discharge process of the bed load. If the slope ratio of the inclined surface of the second tail sill section 2 is less than 10%, the inclined surface is too gentle, and some turbulence may directly cross the second tail sill section 2 and flow into the downstream river; if the slope ratio of the inclined surface of the second tail sill section 2 is greater than 25%, the inclination of the inclined surface is high, and the gravity of the bed load will be greater than the thrust of the water flow on the bed load, so that the bed load falls back into the bottom plate section 3 of the energy dissipation pool, so that the bed load accumulates on the bottom plate section 3 of the energy dissipation pool, thereby reducing the energy dissipation effect of the energy dissipation pool and destroying the energy dissipation pool.

[0046] In one embodiment, continue to refer to Figure 2 ,like Figure 2 As shown, the stilling pool tail sill structure also includes a guardrail section 4 connected between the second tail sill section 2 and the outflow channel, and the height of the water flow bearing surface of the guardrail section 4 is level with the height of the highest point of the second tail sill section 2.

[0047] The guard tank section 4 is used to protect the river channel downstream of the energy dissipation pool to prevent the water from scouring both sides of the river channel. The better the energy dissipation effect of the energy dissipation pool, the shorter the guard tank section can be set to save engineering costs.

[0048] In this embodiment, the water flow bearing surface of the guardrail section 4 is a horizontal plane, the height of which is consistent with the highest height of the second tail sill 2 and the height of the riverbed surface of the outflowing river channel. The water flow after being transformed into a slow flow can flow into the outflowing river channel through the second tail sill section 2 and the guardrail section 4, thereby turning the water flow downstream into a slower flow.

[0049] In one embodiment, continue to refer to Figure 2 The first tail sill 1 includes an arc segment 11 and a tail sill top segment 12 connected in sequence, the water flow bearing surface of the arc segment 11 is the arc surface, the water flow bearing surface of the tail sill top segment 12 is a horizontal plane, and the height of the water flow bearing surface of the tail sill top segment 12 is level with the height of the vertex of the arc surface.

[0050] The first tail sill section 1 includes an arc section 11 and a tail sill top section 12. The water flow bearing surface of the arc section 11 is an arc surface that is concave toward the side away from the water flow bearing surface. The water flow bearing surface of the tail sill top section 12 is a horizontal plane, and its height is consistent with the height of the apex of the arc surface. In this way, the arc section 11 of the first tail sill section 1 can block the turbulent water flow flowing into the energy dissipation pool, thereby dissipating the water flow, and at the same time, it can also reduce the impact of the bedload on the tail sill. The existence of the tail sill top section 12 can provide a retention platform for the bedload to prevent it from falling back into the energy dissipation pool bottom plate section 3 with the water flow, and can also facilitate the water flow to carry the bedload out of the energy dissipation pool.

[0051] It can be understood that the height of the water flow bearing surface of the tail sill top section 12 is lower than the height of the apron section 4 and lower than the height of the riverbed surface of the outflow channel, so that the second tail sill section 2 can form an upward inclined surface from the water flow inlet to the outflow channel.

[0052] It should be noted that the angle formed by the tangent line and the vertical line at the connection between the vertex of the arc surface and the tail sill top section 12 is less than 45°.

[0053] For example, the angle formed by the tangent line and the vertical line at the connection between the vertex of the arc surface and the top section 12 of the tail sill can be 10°; the angle formed by the tangent line and the vertical line at the connection between the vertex of the arc surface and the top section 12 of the tail sill can also be 30°; the angle formed by the tangent line and the vertical line at the connection between the vertex of the arc surface and the top section 12 of the tail sill can also be 40°, etc.

[0054] In this embodiment, the curvature of the arc surface should not be too large. If the curvature of the arc surface is too large, it may cause the tail sill height to be too high, and the gravity acting on the bed load will be greater than the thrust of the water flow, making it difficult for the bed load to climb over the arc surface and flow out of the energy dissipation pool with the water flow. In this case, the bed load accumulates in the energy dissipation pool, affecting the energy dissipation effect of the energy dissipation pool, and requires manual regular cleaning, consuming more human resources.

[0055] The width of the tail sill top section 12 is 0.5m-1.5m.

[0056] Specifically, the width of the tail sill top section 12 may be 0.5 m, 1 m, or 1.5 m.

[0057] It can be understood that the tail sill top section 12, as a transition section between the arc surface and the inclined surface, should not be too narrow or too wide. If the width is too small, it will be difficult to retain the bed load, and the bed load may fall to the stilling pool bottom plate section 3 due to gravity. If the tail sill top section 12 is too wide, on the one hand, it may cause the slope of the inclined surface to be too large, and the bed load may be difficult to be discharged from the stilling pool with the water flow. On the other hand, it will reduce the blocking effect of the arc surface and the inclined surface on the turbulent water flow, thereby reducing the energy dissipation effect of the stilling pool.

[0058] Preferably, a tail sill top section 12 with a width of 1 m is used. Under this width, the tail sill top section can be well connected with the second tail sill section, so that the stilling basin can take into account both the discharge of bed load and the energy dissipation effect.

[0059] In the specific implementation, the turbulent water flow is blocked by the arc section 11 of the first tail sill section 1, so that the turbulent water flow flows back to form a vortex, and the energy dissipation function of the energy dissipation pool is realized in the bottom plate section 3 of the energy dissipation pool, and at the same time, the water flow pushes the bed load to move to the apex of the arc surface, and then moves the bed load to the top section 12 of the tail sill of the first tail sill section 1, wherein the smooth arc surface of the arc section 11 can alleviate the impact of the bed load on the tail sill, thereby avoiding damage to the tail sill; thereafter, after the water flow changes from turbulent flow to slow flow, the inclined surface of the second tail sill section 2 plays a certain buffering role on the water flow discharged from the energy dissipation pool, thereby avoiding the scouring of the tail sill by the water flow out of the pool, and also reducing the scouring of the downstream river channel by the water flow out of the pool; in addition, the water flow out of the pool can push the bed load to be discharged from the energy dissipation pool through the inclined surface of the second tail sill section 2, thereby avoiding the accumulation of larger bed load on the bottom plate section 3 of the energy dissipation pool.

[0060] The arc and reverse slope based tail sill structure of the energy dissipation pool provided in the embodiment of the present application reduces the impact of the bed load on the tail sill through the arc section 11 with a smooth arc surface, thereby avoiding damage to the tail sill, and reduces the problem of the bed load falling from the tail sill section back into the bottom plate section 3 of the energy dissipation pool and being difficult to discharge through the horizontal surface of the tail sill top section 12; at the same time, the large-particle bed load carried by the water flow is smoothly discharged from the energy dissipation pool through the combination of the first tail sill section 1 and the second tail sill section 2, and the energy dissipation effect of the energy dissipation pool can be maintained without frequent maintenance of the energy dissipation pool, thereby reducing the waste of human resources; in addition, since the second tail sill section 2 is an upward inclined surface, it is difficult for the water flow to scour it, and the scouring effect of the outflowing water flow on the guard tank section 4 and the outflow river channel can also be reduced, thereby improving the strength of the tail sill, avoiding damage to the energy dissipation pool, and improving the safety of the energy dissipation pool.

[0061] The tail sill structure of the energy dissipation pool provided in an embodiment of the present application is introduced by taking a specific example, which specifically includes an arc segment with a radius R of 10m, a first tail sill segment composed of a tail sill top segment with a width of 1m, and a second tail sill segment composed of an inclined surface with a slope ratio i of 15%; wherein, the height H of the tail sill top segment from the water flow bearing surface of the energy dissipation pool bottom plate segment is 5m, and the angle between the tangent line at the connection between the tail sill top segment and the vertex of the arc segment and the vertical line is 30°.

[0062] Based on the same inventive concept, an embodiment of the present application provides an energy dissipation pool, including an energy dissipation pool tail sill structure based on a circular arc and a reverse slope as described in any embodiment of the present application.

[0063] The embodiment of the present application provides a stilling pool tail sill structure based on an arc and a reverse slope. By setting a first tail sill section and a second tail sill section, the arc surface of the first tail sill section alleviates the impact of the bed load on the tail sill, and the inclined surface of the second tail sill section realizes a water buffering effect to avoid the scouring of the tail sill by the water flow. In addition, through the combination of the arc surface of the first tail sill section and the inclined surface of the second tail sill section, large-particle bed load carried by the water flow is smoothly discharged from the stilling pool, avoiding the tail sill being easily damaged and the accumulation of bed load in the stilling pool causing the stilling pool to need frequent maintenance.

[0064] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. Without more restrictions, an element defined by the phrase "comprising a ..." does not exclude the existence of other identical elements in the process, method, article or terminal device comprising the element.

[0066] The technical solution provided by the present application is described in detail above. The principle and implementation method of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as limiting the present application. At the same time, for those of ordinary skill in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present application.

Claims

1. A stilling pool tail sill structure based on circular arc and reverse slope, characterized in that: include: A first tail sill section and a second tail sill section are arranged between the water inlet and the outflow channel and are connected in sequence; wherein the first tail sill section is used to connect with the stilling pool bottom plate section, and the stilling pool bottom plate section is closer to the water inlet than the first tail sill section; Among them, the water flow bearing surface of the bottom plate section of the energy dissipation pool is a flat surface, the water flow bearing surface of the first tail sill section is an arc surface recessed toward the side away from the water flow bearing surface, and the water flow bearing surface of the second tail sill section is an inclined surface that rises sequentially in the direction from the water flow inlet to the outflow channel, and the height of the highest point of the second tail sill section is less than or equal to the height of the riverbed surface of the outflow channel.

2. The energy dissipation pool tail sill structure based on circular arc and reverse slope according to claim 1 is characterized in that: It also includes a guardrail section connected between the second tail sill section and the outflow channel, and the height of the water flow bearing surface of the guardrail section is level with the height of the highest point of the second tail sill section.

3. The energy dissipation pool tail sill structure based on circular arc and reverse slope according to claim 1 is characterized in that: The radius of the arc surface is greater than twice the height of the tail sill; wherein the height of the tail sill is the height difference between the water flow bearing surface of the bottom plate section of the energy dissipation pool and the vertex of the arc surface.

4. The energy dissipation pool tail sill structure based on circular arc and reverse slope according to claim 1 is characterized in that: The first tail sill section includes an arc section and a tail sill top section connected in sequence, the water flow bearing surface of the arc section is the arc surface, and the water flow bearing surface of the tail sill top section is a horizontal plane, and the height of the horizontal plane is level with the height of the vertex of the arc surface.

5. The energy dissipation pool tail sill structure based on circular arc and reverse slope according to claim 4 is characterized in that: The angle formed by the tangent line and the vertical line at the connection between the arc surface and the top section of the tail sill is less than 45°.

6. The energy dissipation pool tail sill structure based on circular arc and reverse slope according to claim 4 is characterized in that: The width of the tail sill top section is 0.5-1.5m.

7. The energy dissipation pool tail sill structure based on circular arc and reverse slope according to claim 1 is characterized in that: The slope ratio of the second tail step section is between 10% and 25%.

8. A stilling pool, characterized in that: It includes the energy dissipation pool tail sill structure based on circular arc and reverse slope as described in any one of claims 1 to 7.

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