Overflow dam flood discharge bottom flow anti-scour energy dissipation wall

Abstract

The present invention discloses an energy dissipation wall for preventing scour of bottom flow of overflow dam flood discharge. The bottom of the overflow dam main body flood discharge channel is provided with a drop-slope energy dissipation pool, the far end is provided with an energy dissipation wall, and the area between the energy dissipation pool and the far end energy dissipation wall or the front end area of ​​the energy dissipation pool or the front end area of ​​the far end energy dissipation wall is provided with a composite permeable energy dissipation wall fixed in the bottom layer. The composite permeable energy dissipation wall of the present invention is placed in the area between the energy dissipation pool and the far end energy dissipation wall, and the energy dissipation process mainly causes a part of the discharged water to be dissipated into heat energy through friction, tumbling, diffusion, collision. When the composite energy dissipation wall is built in front of the energy dissipation pool, the scour and wear of the original energy dissipation pool by high-speed water flow can be reduced to a great extent.

Description

Technical Field

[0001] The invention belongs to the technical field of bottom flow energy dissipation under high head and large flow conditions, and in particular relates to an energy dissipation wall for preventing bottom flow scour of an overflow dam. Background Art

[0002] The traditional energy dissipation methods of high-head and large-flow overflow dams mainly include diversion flow, bottom flow, and surface flow. Each energy dissipation method has its own advantages and disadvantages. It is often difficult to achieve the best energy dissipation effect with a single energy dissipation method. Some large hydropower stations that use diversion flow energy dissipation usually combine multiple energy dissipation methods. The diversion flow energy dissipation method has the characteristics of small engineering volume and simple construction, and is used in the first place of high dam flood output. However, the diversion flow energy dissipation height is too high, which will cause serious flood discharge atomization and produce atomized rainfall, affecting the power plant, transportation and agriculture in the dam area. The energy dissipation effect is limited only by lowering the diversion flow height. At present, among the three major energy dissipation methods, bottom flow energy dissipation is still the main one, supplemented by other energy dissipation methods, and a combination of energy dissipation is used. The principle of bottom flow energy dissipation is to set up energy dissipation pools, energy dissipation sills and energy dissipation walls downstream of the water retaining structure to cause the water flow to produce hydraulic jumps within a limited range, and to consume excess energy through internal friction, aeration and impact of the water flow. It has the advantages of stable flow, good energy dissipation effect, and strong adaptability to geological conditions and tailwater level changes.

[0003] However, bottom flow energy dissipation requires the construction of expensive bottom flow energy dissipation pools, which requires large engineering investment. The large degree of bottom flow scouring and damage leads to serious wear and tear of energy dissipation pools and energy dissipation walls, which in turn reduces the energy dissipation effect. The construction cost of the bottom energy dissipation pool and the far end energy dissipation wall of the flood discharge channel is high and the maintenance is difficult.

[0004] Due to the high working head of the high dam project, the flow velocity at the bottom of the energy dissipation pool is very high, making it difficult to ensure the flood discharge safety of the energy dissipation pool itself. The wear and tear caused by long-term water scouring cannot be restored by conventional repair methods, and the reconstruction of the foundation requires a large amount of construction and high cost, especially for the bottom flow energy dissipation requirements under high head and large flow conditions. The larger the height of the drop sill of the bottom flow energy dissipation, the smaller the bottom flow velocity and pulsating pressure of the energy dissipation pool, the closer the water flow pattern is to the surface flow, and the energy dissipation effect is relatively poor; the smaller the height of the drop sill, the closer the water flow pattern in the energy dissipation pool is to the bottom flow pattern of conventional water jump energy dissipation, and the energy dissipation effect is good, but the bottom flow velocity of the energy dissipation pool is large, which is easy to damage the bottom plate. The wear and tear of the drop sill caused by long-term water scouring cannot be restored by conventional repair methods, and the reconstruction of the foundation requires a large amount of construction and high cost, which is difficult to achieve in reality. Summary of the invention

[0005] In view of the problem that the long-term operation of the overflow dam flood discharge process causes serious wear and tear on the bottom flow scouring the energy dissipation pool and is difficult to repair, the present invention provides an overflow dam flood discharge bottom flow anti-scouring energy dissipation wall.

[0006] The present invention solves the technical problem by adopting an overflow dam flood discharge bottom flow anti-scour energy dissipation wall. The bottom of the overflow dam main flood discharge channel is provided with a drop-slope energy dissipation pool, the far end is provided with an energy dissipation wall, and the area between the energy dissipation pool and the far end energy dissipation wall or the front end area of ​​the energy dissipation pool or the front end area of ​​the far end energy dissipation wall is provided with a composite permeable energy dissipation wall fixed in the bottom layer.

[0007] The composite permeable energy dissipation wall includes building a concrete foundation at the bottom of the flood discharge channel and embedding it deep into the stratum through anchor rods, or connecting the concrete foundation to the foundation of the energy dissipation pool, or connecting the concrete foundation to the foundation of the remote energy dissipation wall. The main frame and the auxiliary frame are fixed on the upper side of the foundation by embedded parts, and multiple energy dissipation units are distributed and fixed in an array in the main frame to form a composite structural permeable wall with a multi-layer energy dissipation wall.

[0008] Each energy dissipation unit includes a flow guide base, an inner pull rod, a locking sleeve and a side connecting rod. The middle part of the flow guide base contains a shuttle-shaped disk body. The two side surfaces of the disk body are concave cones. The axis of the disk body has a center hole. The inner pull rod passes through multiple flow guide bases in the longitudinal direction and is fixed. The end of the inner pull rod has a stud section and a locking wire. Locking sleeves are installed between adjacent flow guide bases on the same inner pull rod. Side connecting rods are fixed around the periphery of any locking sleeve. Adjacent side connecting rods on different inner pull rods are fixed together in sequence so that the outermost side connecting rod is fixed to the frame of the main frame, or adjacent side connecting rods are fixed to the common supporting rod at the same time, and the outermost end of the common supporting rod is fixed to the frame of the main frame.

[0009] After the adjacent inner tie rods penetrate multiple flow-guiding base members and are fixed, they are fixed in the main frame along the direction of the water flow. After the water flow hits the surface energy dissipation wall, it is dispersed and diverted through multiple energy dissipation units distributed in the array, so that the longitudinal water flow is decomposed into multiple radial water flows centered on the energy dissipation unit, and the radial water flows at adjacent energy dissipation units impact each other and dissipate energy, and then enter the subsequent layers of energy dissipation walls in turn, and the subsequent layers of energy dissipation walls decompose and dissipate the water flow in the same energy dissipation manner.

[0010] A fixed-distance support tube is also installed between adjacent guide base members on the same inner pull rod, and locking sleeves are respectively provided at both ends of each fixed-distance support tube (the two ends of each fixed-distance support tube are fixed or not fixed to the corresponding locking sleeve). The distance between adjacent guide base members is changed by the distance support tube to adjust the direction of the dispersed water flow.

[0011] The upstream diversion slope section and the downstream countercurrent slope section are sequentially arranged downstream of the distal energy dissipation wall. The diversion slope section runs downward along the slope of :, and the countercurrent slope section runs upward along the slope of :, and the downstream riverbed is lower than the terminal height of the countercurrent slope section. The height of the distal energy dissipation wall is close to the terminal height of the countercurrent slope section. The water flow discharged from the distal energy dissipation wall mainly impacts and falls back in the middle or bottom of the countercurrent slope section, and flows upward along the countercurrent slope section to the highest point at the terminal and then flows down. Countercurrent resistance is formed at the terminal output, and then a partial return flow shock wave is formed between the distal energy dissipation wall and the countercurrent slope section to offset the kinetic energy of the water output at the terminal.

[0012] The guide base of each energy dissipation unit is distributed with guide ridges along its concave cone surface, and the area between adjacent guide ridges forms a straight guide groove. The change in water flow impact pressure in the adjacent straight guide groove area forms a lateral thrust on the guide base, thereby causing each energy dissipation unit to vibrate and transfer it to the main frame to dissipate energy.

[0013] Each flow-guiding base member on the pull rod can rotate.

[0014] The overflow dam flood discharge bottom flow anti-scour energy dissipation wall adopted by the present invention has a foundation that itself does not have an energy dissipation function, will not be destroyed by water flow, and can remain in the bottom layer of the channel for a long time. The main frame and the auxiliary frame are fixed on the upper side of the foundation by embedded parts. The main frame is used to support multiple energy dissipation units, and the auxiliary frame is used to stabilize or connect the main frame to maintain overall stability. Multiple energy dissipation units are distributed and fixed in an array in the main frame to form a composite structure permeable wall with multiple layers of energy dissipation walls. The composite permeable energy dissipation wall is placed in the area between the energy dissipation pool and the distal energy dissipation wall. The energy dissipation process mainly causes a portion of the discharged water to dissipate into heat energy through friction, tumbling, diffusion, and impact. When the composite energy dissipation wall is built in front of the energy dissipation pool, it can greatly reduce the scouring and wear of the original energy dissipation pool by high-speed water flow.

[0015] The energy dissipation wall of the present invention is a combination wall of standardized accessories, which is convenient for assembly and disassembly as well as replacement and maintenance of components, has low construction and maintenance costs, and the components are made of wear-resistant engineering plastics and metal frames, and have a long service life. The standardized component assembly relationship of the composite energy dissipation wall of the present invention is easy to realize partial replacement, which can cause a significant deceleration effect on high-speed water flow, reduce the impact and wear of slow water flow on the bottom flow energy dissipation pool, thereby effectively protecting the bottom flow energy dissipation pool and increasing the service life of the project.

[0016] Furthermore, after the guide base of each energy dissipation unit is distributed with guide ridges along its concave cone surface, the change in water flow impact pressure in the adjacent straight guide groove area can form a lateral thrust on the guide base, thereby causing each energy dissipation unit to vibrate and transfer it to the main frame to dissipate energy.

[0017] After the main part of the inner wear rod is designed to be prismatic and the wear rod and each guide base can rotate synchronously, there are guide ridges distributed along the concave cone surface of the guide base in a spiral direction, and a spiral guide groove is formed in the area between adjacent guide ridges. The water flow impacts the guide base to rotate it. The adjacent guide bases on the same inner wear rod are installed in reverse so that the spiral guide grooves of the adjacent guide bases are in opposite directions. The water flow impacts the spiral guide grooves of the adjacent guide bases to form a driving force in different rotation directions, which acts on the same inner wear rod through the guide base to form positive or reverse rotation work to achieve energy dissipation and disturb the water flow to change its direction. It has the advantages of stable flow state and good energy dissipation effect, and has a strong adaptability to geological conditions and tailwater level changes.

[0018] The composite energy dissipation wall of the present invention can effectively reduce the bottom flow velocity and pulsating pressure of the energy dissipation pool, ensure the safe operation of the energy dissipation pool, meet the energy dissipation requirements of high head and large single width flow flood discharge, and provide a reference and reference for the application of bottom flow energy dissipation method in high dam construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the application of the energy dissipation wall of the present invention.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the composite permeable energy dissipation wall.

[0021] Figure 3 yes Figure 2 Schematic diagram of the front structure.

[0022] Figure 4 yes Figure 2 Schematic diagram of the top view structure.

[0023] Figure 5 yes Figure 2 Schematic diagram of the side structure.

[0024] Figure 6 yes Figure 2 Schematic diagram of the single-layer energy dissipation wall structure.

[0025] Figure 7 yes Figure 6 A partial enlarged schematic diagram of .

[0026] Figure 8 yes Figure 7 Front view diagram of .

[0027] Fig. 9 yes Figure 8 Schematic top view of .

[0028] Fig.10 It is a three-dimensional schematic diagram of the energy dissipation component.

[0029] Fig.11 yes Fig.10 Schematic top view of .

[0030] Fig.12 yes Fig.10 Assembly diagram of .

[0031] Fig.13 It is a schematic diagram of the diversion state of high-speed water flow after passing through the energy dissipation wall of the present invention.

[0032] Fig.14 It is a schematic diagram of the structure of another kind of flow guide base.

[0033] Fig.15 It is a structural schematic diagram of another flow guide base.

[0034] Fig.16 yes Fig.15 Schematic diagram of the front structure.

[0035] Figure numbers: overflow dam body 1, energy dissipation pool 2, composite permeable energy dissipation wall 3, distal energy dissipation wall 4, diversion slope section 5, countercurrent slope section 6, downstream riverbed 7, foundation 31, anchor rod 32, main frame 33, auxiliary frame 34, energy dissipation unit 35, diversion base 351, inner pull rod 352, fixed-distance support pipe 353, locking sleeve 354, side connecting rod 355, stud section 356, locking wire 357, inner sleeve 358, end sleeve 359, disc body 3511, concave cone 3512, center hole 3513, keyway 3514, straight diversion groove 3515, spiral diversion groove 3516. DETAILED DESCRIPTION

[0036] High head and large flow overflow dams usually use bottom flow energy dissipation as the main method and other methods as supplementary methods, such as bottom flow energy dissipation combined with diversion and surface flow energy dissipation. The principle of bottom flow energy dissipation is to set up energy dissipation pools, energy dissipation sills, energy dissipation walls, etc. downstream of high head and large flow overflow dams to promote water jumps within a limited range, and consume excess energy through internal friction, aeration and impact of water flow. It has the advantages of stable flow state, good energy dissipation effect, and strong adaptability to geological conditions and tailwater level changes. Usually, there are wide tail piers, energy dissipation pools and energy dissipation walls at the bottom of the main flood discharge channel. The original kinetic energy of the overflow dam is 9.8Q1H1 kilowatts. Through a variety of energy dissipation methods, the flow rate Q1 to Q2 and the height difference H1 to H2 are reduced, so that the kinetic energy of the water discharge becomes 9.8Q2H2 kilowatts to achieve the purpose of energy dissipation. However, there are still some unresolved contradictions in the bottom flow energy dissipation. The greater the height of the drop sill in the bottom flow energy dissipation structure, the smaller the bottom flow velocity and pulsating pressure of the energy dissipation pool, the closer the flow pattern is to the surface flow, and the energy dissipation effect is relatively poor. The smaller the height of the drop sill, the closer the flow pattern in the energy dissipation pool is to the bottom flow pattern of the conventional water jump energy dissipation, and the energy dissipation effect is good, but the bottom flow velocity of the energy dissipation pool is large, which is easy to damage the bottom plate.

[0037] The present invention adopts a Figure 2The overflow dam flood discharge bottom flow anti-scour energy dissipation wall shown in the figure is placed in the area between the energy dissipation pool 2 and the far end energy dissipation wall 4, or in the front end area of ​​the energy dissipation pool 2 or the front end area of ​​the far end energy dissipation wall 4, such as Figure 1 As shown. The energy dissipation process mainly causes part of the discharged water to dissipate into heat energy through friction, tumbling, diffusion, and impact. When the composite energy dissipation wall is built in front of the energy dissipation pool, it can greatly reduce the scouring and wear of the original energy dissipation pool by high-speed water flow.

[0038] like Figure 2 The composite permeable energy dissipation wall 3 shown in the figure has a concrete foundation 31 built on the bottom of the flood discharge channel and is deeply embedded in the stratum through an anchor rod 32, or the concrete foundation is connected to the foundation of the energy dissipation pool, or the concrete foundation is connected to the foundation of the far end energy dissipation wall. The foundation 31 itself does not have an energy dissipation function, will not be destroyed by water flow, and can remain in the bottom of the channel for a long time.

[0039] The main frame 33 and the auxiliary frame 34 are fixed on the upper side of the foundation 31 by embedded parts. The main frame 33 is used to support multiple energy dissipation units, and the auxiliary frame 34 is used to stabilize or connect the main frame 33 to maintain overall stability. Multiple energy dissipation units 35 are distributed and fixed in an array in the main frame 33 to form a composite structure permeable wall with multiple layers of energy dissipation walls. The distribution relationship between the main frame 33, the auxiliary frame 34 and the multiple energy dissipation units 35 is respectively referred to Figure 3-Figure 5 shown. Figure 6 Only a single-layer energy dissipation wall structure in the composite permeable energy dissipation wall 3 is shown. The layout gaps and front-to-back positional relationships of the multiple energy dissipation units 35 in the main frame 33 can be designed and determined according to actual needs.

[0040] The underflow energy dissipation pool built to achieve underflow energy dissipation is expensive and requires large engineering investment. Long-term erosion by high-speed water flow will inevitably cause wear on the step, which significantly reduces the energy dissipation effect. Conventional repair methods cannot effectively restore it, and rebuilding the foundation requires large construction and high costs. However, the energy dissipation wall of the present invention is a combination wall of standardized accessories, which is convenient for assembly and disassembly, as well as component replacement and maintenance. The construction cost and maintenance cost are low, and the components are made of wear-resistant engineering plastics and metal frames, which have a long service life. Figure 7-Figure 9 As shown, adjacent energy dissipation units 35 in the same single-layer energy dissipation wall are fixedly connected to form a whole through side connecting rods 355, and adjacent energy dissipation units 35 in front and rear are fixedly connected through inner tie rods 352. Each side connecting rod 355 is finally fixed to the main frame 33. The ends of each inner tie rod 352 are fixed to the main frame 33. Each side connecting rod 355 is fixed to the corresponding inner tie rod 352 through a locking sleeve 354.

[0041] like Figure 10-12As shown, each energy dissipation unit 35 includes a flow guide base 351, an inner wear rod 352, a locking sleeve 354 and a side connecting rod 355. The middle part of the flow guide base 351 contains a shuttle-shaped disc 3511, and the two sides of the disc 3511 are concave cones 3512, and the axis of the disc 3511 has a central hole 3513. The inner wear rod 352 passes through a plurality of flow guide bases 351 in the longitudinal direction and is fixed. The end of the inner wear rod 352 has a stud section 356 and a locking wire 357. The locking sleeve 354 is set between adjacent flow guide bases 351 on the same inner wear rod 352. The periphery of any locking sleeve 354 is fixed with a side connecting rod 355. The adjacent side connecting rods 355 on different wear rods 352 are fixed together in sequence, so that the outermost side connecting rod 355 is fixed to the frame of the main frame 33.

[0042] After the adjacent inner tie rods 352 penetrate through the plurality of flow-guiding base members 351 and are fixed, they are respectively fixed in the main frame 33 along the direction of the water flow. Fig.13 As shown, after the water flow impacts the surface layer energy dissipation wall, it is dispersed and diverted through the multiple energy dissipation units 35 distributed in the array, so that the longitudinal water flow is decomposed into multiple radial water flows centered on the energy dissipation unit 35, and the radial water flows at adjacent energy dissipation units 35 impact each other and dissipate energy, and then enter the subsequent layers of energy dissipation walls in turn, and the subsequent layers of energy dissipation walls decompose and dissipate the water flow in the same energy dissipation manner. The energy dissipation process mainly causes a part of the discharged water to dissipate heat energy through friction, tumbling, diffusion, collision. High head and large flow overflow dams will also cause the flow velocity near the bottom of the energy dissipation pool to be very high, making it difficult to ensure the flood discharge safety of the energy dissipation pool itself. The standardized component assembly relationship of the composite energy dissipation wall of the present invention is easy to realize partial replacement, which can cause a significant deceleration effect on high-speed water flow, reduce the impact and wear of slow water flow on the bottom flow energy dissipation pool, thereby effectively protecting the bottom flow energy dissipation pool and increasing the service life of the project.

[0043] A fixed-distance support tube 353 is also installed between adjacent guide base members 351 on the same inner pull rod 352, and locking sleeves 354 are respectively provided at both ends of each fixed-distance support tube 353 (the two ends of each fixed-distance support tube 353 are fixed or not fixed to the corresponding locking sleeve 354). The distance between adjacent guide base members 351 is changed by the distance support tube 353 to adjust the direction of the dispersed water flow.

[0044] The content, scope and form of downstream protection facilities depend on conditions such as hydrology, geology, topography, hub layout and energy dissipation. Figure 1In the embodiment, the upstream diversion slope section 5 and the downstream countercurrent slope section 6 are sequentially arranged downstream of the distal energy dissipation wall 4, the diversion slope section 5 runs downward along the slope of 1:2, the countercurrent slope section 6 runs upward along the slope of 1:3, and the downstream riverbed 7 is lower than the terminal height of the countercurrent slope section 6. The height of the distal energy dissipation wall 4 is close to the terminal height of the countercurrent slope section 6, the water flow discharged from the distal energy dissipation wall 4 mainly impacts and falls back on the middle or bottom of the countercurrent slope section 6, and flows upward along the countercurrent slope section 6 to the highest point at the terminal and then flows down, forming countercurrent resistance at the terminal output and then forming a partial return flow shock wave between the distal energy dissipation wall 4 and the countercurrent slope section 6 to offset the kinetic energy of the water output at the terminal.

[0045] Embodiment 2: Based on Embodiment 1, the guide base 351 of each energy dissipation unit 35 is further provided with guide ridges along the concave conical surface 3512 thereof, such as Fig.14 As shown, a straight guide groove 3515 is formed in the area between adjacent guide ridges. The change in water flow impact pressure in the area adjacent to the straight guide groove 3515 forms a lateral thrust on the guide base 351, thereby causing each energy dissipation unit 35 to vibrate and transfer energy to the main frame 33 to dissipate energy.

[0046] Embodiment 3: Based on the above embodiment 2, the main body of the inner pull rod 352 is further designed to be prismatic, so that the pull rod 352 and each guide base member 351 can rotate synchronously and integrally.

[0047] like Fig.15 and Fig.16 As shown, the inner sleeve 358 is used to support the end of the guide base 351 to provide sufficient pressure to stabilize it. The locking sleeve 354 is sleeved on the outer side of the inner sleeve 358. The two are clamped together through an inner ring step and can rotate. The outer side of the locking sleeve 354 is fixed by a side connecting rod 355.

[0048] At the same time, on the guide base 351, there are guide ridges distributed in a spiral direction along the concave cone surface 3512 thereof, and a spiral guide groove 3516 is formed in the area between adjacent guide ridges. The water flow impacts the guide base 351 to make it rotate. The adjacent guide bases 351 on the same inner pull rod 351 are installed in reverse so that the spiral guide grooves 3516 of the adjacent guide bases 351 are in opposite directions. The water flow impacts the spiral guide grooves 3516 of the adjacent guide bases 351 to form a driving force along different rotation directions, which acts on the same inner pull rod 352 through the guide base 351 to form positive or reverse rotation work to achieve energy dissipation and disrupt the water flow to change its direction.

[0049] Embodiment 4: A design similar to that of Embodiment 3 is provided, wherein the main body of the inner wear rod 352 is prismatic, or a plane or a protruding or recessed position or keyway is provided on the side of the cylindrical main body, and an inner sleeve 358 is mounted on the outer side of the inner wear rod 351, and a keyway 3514 or a key is provided on the inner wall of the center hole of the inner sleeve 358, such as Fig.15 and Fig.16 As shown, the pull rod 352 and each guide base member 351 can rotate synchronously and integrally.

[0050] Example 5: Based on Example 1, an inner pull rod 352 is passed through multiple guide base members 351 in the longitudinal direction and fixed. The end of the inner pull rod 352 is provided with a stud section 356 and a locking wire 357. A locking sleeve 354 is installed between adjacent guide base members 351 on the same inner pull rod 352. A side connecting rod 355 is fixed around the periphery of any locking sleeve 354. Adjacent side connecting rods 355 are fixed to a common supporting rod at the same time. The outermost end of the common supporting rod is fixed in the frame of the main frame 33.

Claims

1. An energy dissipation wall for preventing scour of bottom flow of overflow dam, wherein the bottom of the overflow dam main body flood discharge channel has an energy dissipation pool and the far end has an energy dissipation wall, characterized in that: The area between the energy dissipation pool (2) and the far-end energy dissipation wall (4) or the front area of ​​the energy dissipation pool (2) or the front area of ​​the far-end energy dissipation wall (4) has a composite water-permeable energy dissipation wall (3) fixed in the bottom layer. The composite water-permeable energy dissipation wall (3) includes a concrete foundation (31) built on the bottom layer of the flood discharge channel and deeply embedded in the stratum through anchor rods (32), or the concrete foundation is connected to the foundation of the energy dissipation pool, or the concrete foundation is connected to the foundation of the far-end energy dissipation wall, and the upper side of the concrete foundation (31) is fixed with a main frame (33) and an auxiliary frame (34) through embedded parts. A plurality of energy dissipation units (35) are distributed and fixed in an array in the main frame (33) to form a composite structure permeable wall with a multi-layer energy dissipation wall. Each energy dissipation unit (35) includes a flow guide base (351), an inner pull rod (352), a locking sleeve (354) and a side connecting rod (355). The middle part of the flow guide base (351) contains a shuttle-shaped disc (3511). The two side surfaces of the disc (3511) are concave cones. The inner wear pull rod (352) is provided with a central hole (3513) at the axis of the disk body (3511), and the inner wear pull rod (352) penetrates through the plurality of flow guide base members (351) in the longitudinal direction and is fixed thereto, and the end of the inner wear pull rod (352) is provided with a stud section (356) and a locking wire (357) thereon, and a locking sleeve (354) is provided between adjacent flow guide base members (351) on the same inner wear pull rod (352), and the periphery of any locking sleeve (354) is A side connecting rod (355) is fixed on the side, and adjacent side connecting rods (355) on different inner-penetrating tie rods (352) are fixed together in sequence, so that the outermost side connecting rod (355) is fixed on the frame of the main frame (33), or adjacent side connecting rods (355) are fixed to a common supporting rod at the same time, and the outermost end of the common supporting rod is fixed on the frame of the main frame (33); adjacent inner-penetrating tie rods (352) penetrate multiple flow-guiding base members (351) and are fixed, and are respectively fixed in the main frame (33) along the direction of the water flow; after the water flow impacts the surface energy dissipation wall, it is dispersed and guided through multiple energy dissipation units (35) distributed in an array, so that the longitudinal water flow is decomposed into multiple radial water flows centered on the energy dissipation unit (35), and after the radial water flows at adjacent energy dissipation units (35) impact each other and dissipate energy, they enter the subsequent layers of energy dissipation walls in sequence, and the subsequent layers of energy dissipation walls decompose and dissipate energy of the water flow in the same energy dissipation manner.

2. The overflow dam flood discharge bottom flow anti-scour energy dissipation wall according to claim 1 is characterized in that: A fixed-distance support tube (353) is also installed between adjacent flow-guiding base members (351) on the same inner pull rod (352), and locking sleeves (354) are respectively provided at both ends of each fixed-distance support tube (353). The distance between adjacent flow-guiding base members (351) is changed by the fixed-distance support tube (353) to adjust the direction of the dispersed water flow.

3. The overflow dam flood discharge bottom flow anti-scour energy dissipation wall according to claim 1 is characterized in that: The guide base (351) of each energy dissipation unit (35) is provided with guide ridges distributed along the concave cone surface (3512) thereof, and a straight guide groove (3515) is formed in the area between adjacent guide ridges. The change in water flow impact pressure in the area adjacent to the straight guide groove (3515) forms a lateral thrust on the guide base (351), thereby causing each energy dissipation unit (35) to vibrate and transmit the energy to the main frame (33) to dissipate energy.

4. The overflow dam flood discharge bottom flow anti-scour energy dissipation wall according to claim 1, characterized in that: Each flow-guiding base member (351) on the inner pull rod (352) can rotate.

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