Downstream canal slope repair and reinforcement structure and construction method for drop energy dissipation of dry canal into river section

Abstract

The application discloses a dry canal into river section drop water energy dissipation downstream canal slope repair and reinforcement structure and a construction method. The drop water energy dissipation structure comprises a first energy dissipation baffle arranged in the middle of a drop water discharge channel and vertical to drop water flow, a tail part of the drop water discharge channel is provided with a second energy dissipation baffle vertical to drop water flow, and the height of the first energy dissipation baffle is higher than that of the second energy dissipation baffle. Canal slope repair and reinforcement structures are arranged on both banks of the intersection of the river channel and the dry canal, and the canal slope repair and reinforcement structure comprises a canal bottom, upwardly inclined canal slopes are arranged on both sides of the canal bottom, a top sealing tooth wall is further arranged on the top of the canal slope, a first tooth wall is arranged at the bottom of the canal slope, and a second tooth wall is arranged between the first tooth wall and the canal bottom. The water flow can complete energy dissipation in the drop water discharge channel, the drop water energy dissipation effect is improved, the water flow is guided, and the water flow is prevented from being turbulent. The stability is good, the anti-scouring capacity is strong, the lining structure of the canal slope on both banks of the downstream river channel is prevented from falling off under long-term stress, the water and soil loss and loosening of the canal slope are avoided, and the safety hidden danger is eliminated.

Description

Technical field:

[0001] The present invention relates to the field of water conservancy projects, and in particular to a structure and a construction method for repairing and reinforcing a channel slope downstream of a main channel at a river inlet section where a waterfall is used for energy dissipation. Background technology:

[0002] In water conservancy projects, several main channels are set up on both sides of the river to facilitate the collection of water in the main channels into the river. Since the water level of the main channels is generally higher than the water level of the river, and there is a certain angle between the main channels and the river, a stilling sill is generally set at the intersection of the main channels and the river to dissipate the energy of the water flow. The current stilling sill is located at the end of the waterfall. Due to the high stilling sill, new water flow is easily generated during the flow, resulting in incomplete energy dissipation. After the waterfall enters the river, the water flow is deflected at a certain angle. If the water flow cannot complete the energy dissipation in the waterfall chute, the deflection will cause turbulence and deflection of the water flow and local scouring after the outflow. The lining structure of the channel slope on both sides of the downstream river channel is prone to fall off due to long-term stress over time, causing soil erosion and loosening of the channel slope, posing a safety hazard.

[0003] Therefore, how to improve the energy dissipation effect of the waterfall at the entrance of the main canal to the river and repair and reinforce the channel slopes on both sides of the downstream have become technical problems that need to be solved urgently in the industry. Summary of the invention:

[0004] In order to make up for the shortcomings of the existing technology, the present invention provides a structure and construction method for repairing and reinforcing the downstream channel slope of the main channel in the river section with a waterfall energy dissipation. It can not only improve the waterfall energy dissipation effect, divert water and avoid water flow turbulence, but also make the downstream channel slope have strong resistance to water impact and not easy to fall off, eliminating safety hazards and solving the problems existing in the existing technology.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] The downstream channel slope repair and reinforcement structure of the waterfall energy dissipation section of the main channel entering the river includes the intersecting main channel and river channel, the water level of the main channel is higher than the water level of the river channel, and there is an angle between the main channel and the river channel. A waterfall chute is provided in the river channel below the waterfall flow of the main channel, and a waterfall energy dissipation structure is provided in the waterfall chute. The waterfall energy dissipation structure includes a first-level stilling sill perpendicular to the waterfall flow arranged in the middle of the waterfall chute, and a second-level stilling sill perpendicular to the waterfall flow is provided at the tail of the waterfall chute, and the height of the first-level stilling sill is higher than that of the second-level stilling sill; a channel slope repair and reinforcement structure is provided on both sides of the intersection of the river channel and the main channel, including a channel bottom, upwardly inclined channel slopes are provided on both sides of the channel bottom, a capping tooth wall is also provided on the outer side of the top of the channel slope, a first-level tooth wall is provided at the bottom of the channel slope, and a second-level tooth wall is provided between the first-level tooth wall and the channel bottom.

[0007] The height of the first-level energy dissipation sill is 0.5m, and the height of the second-level energy dissipation sill is 0.2m.

[0008] The first-level energy dissipation sill and the second-level energy dissipation sill adopt gabion stone cages.

[0009] A plurality of trapezoidal reinforcements and linear reinforcements are arranged in the first-level energy dissipation sill and the second-level energy dissipation sill.

[0010] A plurality of L-shaped anchor bars are provided at the bottom of the first-level energy dissipation sill and the second-level energy dissipation sill. The bottom of the L-shaped anchor bars is inserted below the ground and fixed by underwater anchor bar glue.

[0011] The channel slope includes a mortar block stone layer on the outside, a crushed stone cushion layer in the middle and a composite geomembrane on the inside. A number of transverse joints are arranged at intervals in the mortar block stone layer. The capping tooth wall adopts a mortar block stone tooth wall, the first-level tooth wall adopts a mortar block stone tooth wall, and the second-level tooth wall adopts a cast-in-place concrete tooth wall. The lower part of the transverse joint is filled with closed-cell foam board, and the upper part is filled with asphalt mortar.

[0012] The channel slope includes a cast-in-place concrete layer on the outside, a crushed stone cushion layer in the middle and a composite geomembrane on the inside. A number of transverse joints and longitudinal joints are staggered in the cast-in-place concrete layer. The capping tooth wall adopts a cast-in-place concrete tooth wall, the first-level tooth wall adopts a cast-in-place concrete tooth wall, a number of transverse joints are arranged at intervals in the first-level tooth wall, and the second-level tooth wall adopts a cast-in-place concrete tooth wall. The lower part of the transverse joints and longitudinal joints is filled with closed-cell foam boards, and the upper part is filled with two-component polysulfide sealant.

[0013] A medium-coarse sand trough is provided on the lower side of the composite geomembrane, and the drainage pipe passes through the bottom of the channel slope from the outside to the inside and extends into the medium-coarse sand trough. The drainage pipe is arranged upward from the outside to the inside, and the inclination angle of the drainage pipe is 5 degrees. The drainage pipe located in the medium-coarse sand trough is provided with a number of openings arranged in a plum blossom shape. The opening section and the pipe head are wrapped and tied with geotextile. The medium-coarse sand trough and the channel slope are arranged in a right triangle.

[0014] The crushed stone in the crushed stone cushion layer has a particle size of 5-20 mm.

[0015] A construction method for repairing and reinforcing the downstream channel slope of a main channel inlet section with a waterfall energy dissipation system comprises the following steps:

[0016] S1: A waterfall energy dissipation structure is installed in a waterfall chute in the river channel below the waterfall flow of the main canal. The waterfall energy dissipation structure includes a first stilling sill located in the middle of the waterfall chute and perpendicular to the waterfall flow. A second stilling sill is located at the tail of the waterfall chute and perpendicular to the waterfall flow. The height of the first stilling sill is higher than that of the second stilling sill. The first stilling sill is used to dissipate the primary energy of the water flow with a deeper water depth and a larger flow rate upstream, and the second stilling sill is used to dissipate the secondary energy of the water flow with a shallower water depth and a smaller flow rate downstream;

[0017] S2: A channel slope repair and reinforcement structure is set up on both sides of the intersection of the river channel and the main canal, including a channel bottom, upward inclined channel slopes are set on both sides of the channel bottom, a capping tooth wall is also set on the outer side of the top of the channel slope, a first-level tooth wall is set at the bottom of the channel slope, and a second-level tooth wall is set between the first-level tooth wall and the channel bottom.

[0018] The present invention adopts the above solution and has the following advantages:

[0019] By setting up the first-level and second-level stilling sills, it is possible to ensure that the water flow dissipates energy in the waterfall chute, thereby improving the energy dissipation effect of the waterfall, guiding the water, and avoiding water flow turbulence; by setting up the first-level tooth wall and the capping tooth wall at the bottom and top of the channel slope, the adhesion of the channel slope is greatly improved and the structure is more stable; by setting up the first-level and second-level tooth walls between the channel slope and the channel bottom, the tooth walls are deeply buried in the rock foundation with a weak mud layer, playing an anti-scouring chain role, greatly enhancing the ability to resist water impact and protecting the channel slope from scouring; the channel slope itself has good stability and strong anti-scouring ability, which avoids the long-term stress-induced detachment of the lining structure of the channel slope on both sides of the downstream river channel, avoids soil erosion and loosening of the channel slope, and eliminates safety hazards. Description of the drawings:

[0020] Figure 1 It is a schematic diagram of the top structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the main structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the embedded reinforcement structure of the energy dissipation sill of the present invention.

[0023] Figure 4 Schematic diagram of the reinforcement structure of the energy dissipation sill of the present invention.

[0024] Figure 5 This is a structural schematic diagram of Example 1 of the channel slopes on both sides of the river channel of the present invention.

[0025] Figure 6 for Figure 5 A in the figure is an enlarged structural diagram.

[0026] Figure 7 for Figure 5 Schematic diagram of the side view structure of the channel slope.

[0027] Figure 8 for Figure 7 BB cross-sectional structural diagram in FIG.

[0028] Figure 9 This is a structural schematic diagram of Example 2 of the channel slopes on both sides of the river channel of the present invention.

[0029] Figure 10 for Figure 9The enlarged structural diagram at C in FIG.

[0030] Figure 11 for Figure 9 Schematic diagram of the side view structure of the channel slope.

[0031] Figure 12 for Figure 11 DD-direction cross-sectional structural diagram.

[0032] In the figure, 1. main canal, 2. river channel, 3. waterfall chute, 4. primary stilling bank, 5. secondary stilling bank, 6. trapezoidal reinforcement, 7. linear reinforcement, 8. L-shaped embedded reinforcement, 9. channel bottom, 10. channel slope, 11. capping tooth wall, 12. primary tooth wall, 13. secondary tooth wall, 14. mortared block stone layer, 15. cast-in-place concrete layer, 16. crushed stone cushion layer, 17. composite geomembrane, 18. transverse joint, 19. closed-cell foam board, 20. asphalt mortar, 21. longitudinal joint, 22. two-component polysulfide sealant, 23. medium-coarse sand trough, 24. drainage pipe. Specific implementation method:

[0033] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0034] Example 1:

[0035] like Figure 1-8 As shown, the downstream channel slope repair and reinforcement structure of the waterfall energy dissipation at the main channel inlet section includes the intersecting main channel 1 and river channel 2. The water level of the main channel 1 is higher than that of the river channel 2. There is an angle between the main channel 1 and the river channel 2. A waterfall chute 3 is provided in the river channel 2 below the waterfall flow of the main channel 1. The waterfall chute 3 is provided with a waterfall energy dissipation structure. The waterfall energy dissipation structure includes a first-level stilling sill 4 arranged in the middle of the waterfall chute 3 and perpendicular to the waterfall flow. A second-level stilling sill 5 is arranged at the tail of the waterfall chute 3 and perpendicular to the waterfall flow. The height of the first-level stilling sill 4 is higher than that of the second-level stilling sill 5. The height of the first-level stilling sill 4 is 0.5m, which is used for primary energy dissipation of water flow with deeper water depth and larger flow upstream. The height of the second-level stilling sill 5 is 0.2m, which is used for secondary energy dissipation of water flow with shallower water depth and smaller flow downstream.

[0036] The first-level energy dissipation sill 4 and the second-level energy dissipation sill 5 are made of gabion stone cages with a single size of 0.5×0.5×0.25m. They are combined according to the height difference and have a maximum width of 1.0m.

[0037] The first-level energy dissipation sill 4 and the second-level energy dissipation sill 5 are provided with a plurality of trapezoidal reinforcements 6 and linear reinforcements 7 to increase their own strength.

[0038] The bottom of the first-level energy dissipation sill 4 and the second-level energy dissipation sill 5 is provided with a plurality of L-shaped anchor bars 8, which are arranged in a plum blossom shape. The bottom of the L-shaped anchor bars 8 is inserted below the ground and fixed by underwater anchor glue, which can ensure that the first-level energy dissipation sill 4 and the second-level energy dissipation sill 5 are firmly fixed.

[0039] After the water in the main canal 1 falls into the river channel 2, it falls directly into the waterfall chute 3 from top to bottom. When the water depth upstream is deep and the flow rate is large, the water first passes through the first-level stilling sill 4 in the middle of the waterfall chute 3, which is perpendicular to the waterfall water flow, for energy dissipation. When the water depth downstream is shallow and the flow rate is small, the water flow over the sill is a free outflow, and a far-drive water jump will occur, and energy dissipation facilities still need to be added. Therefore, the present invention adds a second-level stilling sill 5 perpendicular to the waterfall water flow at the tail end of the waterfall chute 3 for secondary energy dissipation, which can ensure that the water flow completes energy dissipation in the waterfall chute 3, thereby improving the waterfall energy dissipation effect and playing a diversion role for the water.

[0040] A channel slope repair and reinforcement structure is provided on both sides of the intersection of the river channel 2 and the main canal 1, including a channel bottom 9. Channel slopes 10 inclined upward are provided on both sides of the channel bottom 9. A capping tooth wall 11 is also provided on the outer side of the top of the channel slope 10. A first-level tooth wall 12 is provided at the bottom of the channel slope 10. The first-level tooth wall 12 and the capping tooth wall 11 cooperate to greatly improve the adhesion of the channel slope 10 and make the structure more stable. A second-level tooth wall 13 is provided between the first-level tooth wall 12 and the channel bottom 9. The first-level tooth wall 12 and the second-level tooth wall 13 cooperate. The tooth wall is deeply buried in the rock foundation with a weak mud layer, which plays an anti-scouring chain role, greatly enhances the ability to resist water impact, and protects the channel slope from scouring.

[0041] The channel slope 10 includes a mortar block stone layer 14 on the outside, a crushed stone cushion layer 16 in the middle and a composite geomembrane 17 on the inside. The composite geomembrane 17 is first used for anti-seepage. The mortar block stone layer 14 is set to 30 cm thick, and the crushed stone cushion layer 16 is laid to 20 cm thick. The crushed stone cushion layer 16 is then used to protect the soft soil and improve the bearing capacity of the foundation. The mortar block stone layer 14 is then laid on the outside. The mortar block stone layer 14 has good stability, strong anti-scouring ability, and is not easy to fall off, thereby avoiding soil erosion and loosening of the channel slope and eliminating safety hazards. The mortar block stone layer 14 is provided with a plurality of transverse joints at intervals. 18. The transverse joint 18 is mainly used to reduce the longitudinal constraint of the channel slope to adapt to the uneven settlement and temperature changes of the foundation. The capping tooth wall 11 adopts a mortar block stone tooth wall to strengthen the top of the channel slope 10. The first-level tooth wall 12 adopts a mortar block stone tooth wall to support the bottom of the channel slope 10. The second-level tooth wall 13 adopts a cast-in-place concrete tooth wall. The gap between the mortar block stone tooth wall and the channel bottom is cast in-place concrete to form a cast-in-place concrete tooth wall to achieve seamless connection and increase strength. The lower part of the transverse joint 18 is filled with a closed-cell foam board 19, and the upper part is filled with asphalt mortar 20.

[0042] A medium-coarse sand trough 23 is provided on the underside of the composite geomembrane 17. A drainage pipe 24 extends from the outside to the inside through the bottom of the canal slope 10 and into the medium-coarse sand trough 23. The drainage pipe 24 is arranged upwardly and tilted from the outside to the inside, with an inclination angle of 5 degrees. The drainage pipe 24 located within the medium-coarse sand trough 23 is provided with a plurality of openings arranged in a plum blossom pattern. The opening section and the pipe head are wrapped and tied with geotextile, which prevents sand and gravel from entering the drainage pipe 24 and causing blockage. The medium-coarse sand trough 23 is arranged in a right triangle with the canal slope 10. Water is collected by the medium-coarse sand trough 23, and the water enters the drainage pipe 24 through the plurality of openings on the drainage pipe 24 and then discharges into the river. The drainage pipe 24 is a φ60mm PE pipe, with the outlet located 0.15m above the canal bottom. It is buried at a 5% slope from the outside to the inside, facilitating the discharge of water from the medium-coarse sand trough through the drainage pipe 24 to the river 2.

[0043] The crushed stones in the crushed stone cushion layer 16 have a particle size of 5-20 mm and a relative density of not less than 0.7, which can reduce the settlement, adjust the uneven settlement of the foundation, and accelerate the drainage and consolidation of the foundation.

[0044] A construction method for repairing and reinforcing the downstream channel slope of a main channel inlet section with a waterfall energy dissipation device comprises the following steps:

[0045] S1: A waterfall energy dissipation structure is installed in a waterfall chute in the river channel below the waterfall flow of the main canal. The waterfall energy dissipation structure includes a first stilling sill located in the middle of the waterfall chute and perpendicular to the waterfall flow. A second stilling sill is located at the tail of the waterfall chute and perpendicular to the waterfall flow. The height of the first stilling sill is higher than that of the second stilling sill. The first stilling sill is used to dissipate the primary energy of the water flow with a deeper water depth and a larger flow rate upstream, and the second stilling sill is used to dissipate the secondary energy of the water flow with a shallower water depth and a smaller flow rate downstream;

[0046] S2: A channel slope repair and reinforcement structure is set up on both sides of the intersection of the river channel and the main canal, including a channel bottom, upward inclined channel slopes are set on both sides of the channel bottom, a capping tooth wall is also set on the outer side of the top of the channel slope, a first-level tooth wall is set at the bottom of the channel slope, and a second-level tooth wall is set between the first-level tooth wall and the channel bottom.

[0047] After the main canal 1 intersects the river channel 2, the water flow in the main canal 1 causes an impact on the channel slopes 10 on both sides of the downstream of the river channel 2. By arranging a first-level tooth wall 12 and a capping tooth wall 11 at the bottom and top of the channel slope 10, the adhesion of the channel slope 10 is greatly improved and the structure is more stable. The first-level tooth wall 12 and the second-level tooth wall 13 cooperate to play an anti-scouring chain role, greatly enhancing the ability to resist water impact and protecting the channel slope 10 from scouring. The channel slope 4 includes a mortar block stone layer 14 on the outside, a crushed stone cushion layer 16 in the middle and a composite geomembrane 17 on the inside. First, the composite geomembrane 17 is used for anti-seepage, and then the crushed stone cushion layer 16 is used to protect the soft soil to improve the bearing capacity of the foundation. Then the mortar block stone layer 14 is laid on the outside. The mortar block stone layer 14 has good stability, strong anti-scouring ability, and is not easy to fall off, thereby avoiding water and soil erosion and loosening of the channel slope and eliminating safety hazards.

[0048] Example 2:

[0049] like Figure 9-12 As shown, the difference between this embodiment and embodiment 1 is that: the channel slope 10 includes a cast-in-situ concrete layer 15 arranged on the outside, a crushed stone cushion layer 16 arranged in the middle and a composite geomembrane 17 arranged on the inside, firstly, the composite geomembrane 17 is used for anti-seepage, the cast-in-situ concrete layer 15 adopts C25 cast-in-situ concrete, the cast-in-situ concrete layer 15 is set to 20 cm thick, the crushed stone cushion layer 16 is laid to 20 cm thick, and then the crushed stone cushion layer 16 is used to protect the soft soil to improve the bearing capacity of the foundation, and then the cast-in-situ concrete layer 15 is laid on the outside. The cast-in-situ concrete layer 15 has good stability, strong anti-scouring ability, and is not easy to fall off, thereby avoiding soil erosion and loosening of the channel slope 10 and eliminating safety hazards. The cast-in-situ concrete layer 15 is staggered with a number of transverse joints 18 and longitudinal joints 2 1. The transverse joints 18 and longitudinal joints 21 are mainly used to reduce the longitudinal and transverse constraints of the channel slope 10 to adapt to the uneven settlement and temperature changes of the foundation. The capping tooth wall 11 adopts a cast-in-place concrete tooth wall to strengthen the top of the channel slope 10. The first-level tooth wall 12 adopts a cast-in-place concrete tooth wall to support the bottom of the channel slope 10. A number of transverse joints 18 are arranged at intervals within the first-level tooth wall 12. The second-level tooth wall 13 adopts a cast-in-place concrete tooth wall, using C20 cast-in-place concrete. The distance between the first-level tooth wall 12 and the channel bottom 9 is cast-in-place concrete to form a cast-in-place concrete tooth wall, achieving seamless connection and increasing strength. The lower part of the transverse joint 18 and the longitudinal joint 21 is filled with a closed-cell foam board 19, and the upper part is filled with a two-component polysulfide sealant 22. Other features are the same as those in Example 1.

[0050] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any replacement, improvement or transformation made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0051] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. The downstream channel slope repair and reinforcement structure of the waterfall energy dissipation at the main channel inlet section is characterized by: The invention comprises a main canal and a river channel that intersect, the water level of the main canal is higher than the water level of the river channel, and there is an angle between the main canal and the river channel, a waterfall chute is provided in the river channel below the waterfall flow of the main canal, and a waterfall energy dissipation structure is provided in the waterfall chute, and the waterfall energy dissipation structure comprises a first-level stilling sill provided in the middle of the waterfall chute and perpendicular to the waterfall flow, a second-level stilling sill provided at the tail of the waterfall chute and perpendicular to the waterfall flow, and the height of the first-level stilling sill is higher than that of the second-level stilling sill; a channel slope repair and reinforcement structure is provided on both sides of the intersection of the river channel and the main canal, including a channel bottom, channel slopes inclined upward are provided on both sides of the channel bottom, a capping tooth wall is further provided on the outer side of the top of the channel slope, a first-level tooth wall is provided at the bottom of the channel slope, and a second-level tooth wall is provided between the first-level tooth wall and the channel bottom; The first-level and second-level energy dissipation sills are made of gabion stone cages; The first-level and second-level stilling sills are provided with a plurality of trapezoidal reinforcements and linear reinforcements; The bottom of the first-level and second-level stilling sills are provided with a plurality of L-shaped anchor bars, the bottom of the L-shaped anchor bars are inserted below the ground and fixed by underwater anchor glue; The channel slope includes a mortar block stone layer arranged on the outside, a crushed stone cushion layer arranged in the middle, and a composite geomembrane arranged on the inside. A plurality of transverse joints are provided at intervals in the mortar block stone layer. The capping tooth wall adopts a mortar block stone tooth wall, the first-level tooth wall adopts a mortar block stone tooth wall, and the second-level tooth wall adopts a cast-in-place concrete tooth wall. The lower part of the transverse joint is filled with a closed-cell foam board, and the upper part is filled with asphalt mortar. Alternatively, the channel slope includes a cast-in-situ concrete layer on the outside, a crushed stone cushion layer in the middle, and a composite geomembrane on the inside; a plurality of transverse and longitudinal seams are staggered in the cast-in-situ concrete layer; the capping tooth wall is a cast-in-situ concrete tooth wall; the first-level tooth wall is a cast-in-situ concrete tooth wall; a plurality of transverse seams are spaced apart in the first-level tooth wall; the second-level tooth wall is a cast-in-situ concrete tooth wall; the lower parts of the transverse and longitudinal seams are filled with closed-cell foam boards, and the upper parts are filled with two-component polysulfide sealant; A medium-coarse sand trough is provided on the lower side of the composite geomembrane, and the drainage pipe passes through the bottom of the channel slope from the outside to the inside and extends into the medium-coarse sand trough. The drainage pipe is arranged upwardly and tilted from the outside to the inside. The drainage pipe located in the medium-coarse sand trough is provided with a plurality of openings arranged in a plum blossom shape. The opening section and the pipe head are wrapped and tied with geotextile. The medium-coarse sand trough and the channel slope are arranged in a right triangle. The crushed stone in the crushed stone cushion layer has a particle size of 5-20 mm.

2. The downstream channel slope repair and reinforcement structure of the main channel inlet section of the waterfall energy dissipation according to claim 1 is characterized by: The height of the first-level energy dissipation sill is 0.5m, and the height of the second-level energy dissipation sill is 0.2m.

3. The downstream channel slope repair and reinforcement structure of the main channel inlet section of the waterfall energy dissipation according to claim 1 is characterized by: The drain pipe has an inclination angle of 5 degrees.

4. A construction method for repairing and reinforcing the downstream channel slope of a main channel inlet section of a waterfall energy dissipation device as claimed in claim 1, characterized in that: The steps include: S1: A waterfall energy dissipation structure is installed in a waterfall chute in the river channel below the waterfall flow of the main canal. The waterfall energy dissipation structure includes a first stilling sill located in the middle of the waterfall chute and perpendicular to the waterfall flow. A second stilling sill is located at the tail of the waterfall chute and perpendicular to the waterfall flow. The height of the first stilling sill is higher than that of the second stilling sill. The first stilling sill is used to dissipate the primary energy of the water flow with a deeper water depth and a larger flow rate upstream, and the second stilling sill is used to dissipate the secondary energy of the water flow with a shallower water depth and a smaller flow rate downstream; S2: A channel slope repair and reinforcement structure is set up on both sides of the intersection of the river channel and the main canal, including a channel bottom, upward inclined channel slopes are set on both sides of the channel bottom, a capping tooth wall is also set on the outer side of the top of the channel slope, a first-level tooth wall is set at the bottom of the channel slope, and a second-level tooth wall is set between the first-level tooth wall and the channel bottom.

Images