River channel construction method and structure

Abstract

The invention relates to the technical field of riverway construction, in particular to a riverway construction method and structure, and the riverway construction method comprises the following steps: S1, foundation cleaning operation is carried out within an engineering range, the cleaning depth is not less than 300 mm, surface vegetation and sundries are removed, a bulldozer and an excavator are adopted for cleaning, a substrate layer is exposed, and a cleaned substrate surface is obtained; the environment adaptability and ecological friendliness of construction are improved. According to the method, mechanical operation is adopted in the cleaning and soil treatment stages, utilization and protection of surface soil are optimized, and environmental pollution is reduced. Excavation parameters such as depth and gradient are controlled, slope collapse is effectively prevented, and the structural stability of the river channel is enhanced. On the construction of riverbed protection and drainage systems, continuous lead wire gabions and high-standard drainage facilities are introduced, so that the erosion resistance and the water flow management efficiency of the riverbed are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of river channel construction, and in particular to a river channel construction method and structure. Background Art

[0002] The field of river construction technology involves a series of engineering technologies and methods to construct, repair or improve the physical structure and water flow conditions of rivers and their tributaries. This field includes river excavation and dredging, embankment construction, riverbed regulation, aquatic ecological restoration and the implementation of flood control measures. Specific projects may cover the excavation of new river channels, the diversion of old river channels, and the construction and maintenance of related hydraulic structures such as dams, gates and pumping stations. In addition, river construction must also take into account water quality management, soil erosion control and the protection of the surrounding ecological environment to ensure the sustainable development and environmental friendliness of the project.

[0003] Existing technologies often lack long-term and effective environmental protection measures in riverbed protection and drainage system construction, making the projects vulnerable to flooding and erosion, affecting the functionality and safety of the river. These technical limitations not only affect the quality and durability of the project, but may also have long-term negative impacts on the ecological environment. For example, insufficient slope stability can lead to soil erosion, affecting river water quality and biodiversity. Inadequate drainage systems may cause severe flooding during the rainy season, threatening the safety of nearby communities. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a river channel construction method and structure.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme, a river channel construction method, comprising the following steps: S1, carry out the base clearing operation within the scope of the project, with a clearing depth of not less than 300mm, remove the surface vegetation and debris, use bulldozers and excavators to clear, expose the base layer, and obtain the cleaned base surface; S2, for the cleaned base surface, identify the soil layer that meets the conditions for topsoil stripping, use an excavator to strip the topsoil layer with an average thickness of 0.3m, prevent over-excavation, and stack the stripped topsoil separately from other materials. Remove plastic, metal, glass, stone and brick fragments through manual selection or mechanical screening, crush grass roots and straw and mix them evenly to obtain the processed planting topsoil; S3, use the treated planting topsoil in the designated planting area within the project, use a land grader or manually spread the topsoil evenly, and use a roller to compact the soil after it is leveled to eliminate air gaps, thus obtaining a laid planting soil layer; S4, in the paved planting soil layer, use excavators and dredging equipment to dig to the designed river channel depth and width, control the excavation slope between 1:1.5 and 1:2 to prevent slope collapse, and if groundwater is encountered, use open drainage or water collection well dewatering methods to ensure construction safety and obtain the excavated river channel; S5, in the excavated river channel, build river steps on the left and right banks respectively, use C25W6F200 concrete to cast the steps, install and fix the formwork according to the designed size, cast concrete in layers according to the step height, and the thickness of each layer shall not exceed 500mm. Use a vibrator to vibrate and eliminate air gaps to ensure that the concrete is dense. After completion, perform curing for no less than 7 days to obtain the completed river steps; S6, protect the riverbed area adjacent to the completed riverbed steps, lay a wire gabion protection layer, place gabions filled with stones in the designated riverbed area, use galvanized steel wire to tie, connect and fix adjacent gabions, anchor them to the bottom of the riverbed, form a continuous protection layer, enhance the riverbed's ability to resist water impact, prevent erosion, and obtain a protected riverbed section; S7, with the protected riverbed section as a reference, build an off-embankment drainage system outside the embankment, install C25 reinforced concrete drainage transfer wells at designated locations, use C15 concrete cushion with a thickness of 200-300mm for the foundation, lay four DN1800 and five DN800 concrete culverts across the embankment, use graded sand and gravel cushion for the culvert foundation, use rubber rings to seal the pipe joints, set stone slope protection at the outlet to prevent erosion and blockage, and obtain a completed drainage system; S8, using the appropriate soil material generated by the project excavation, fill the area between the upstream slope 1:4 and the downstream slope 1:3 as the backfill of Zone I, lay the fill material with a thickness of 200-300mm in layers, compact it with a roller or tamping machine, and the compaction degree of each layer reaches not less than 0.93. The compaction effect is verified by on-site density test to obtain the compacted embankment of Zone I; S9, beyond the 1:3 backslope of the compacted embankment in zone I, continue to use the same suitable soil material for filling to form the backfill of zone II, compact in layers, and achieve a compaction degree of not less than 0.91. This area is used to form a micro-topography landscape. The relative density of sandy soil is not less than 0.60, and a compacted embankment in zone II is obtained.

[0006] S10, micro-topography shaping is carried out on the compacted embankment in Zone II. According to the design plan, bulldozers and graders are used to create gentle slopes and undulating terrain with a slope of 1:5 to 1:10. The slope compaction degree reaches no less than 0.90 to prevent soil slippage and obtain a completed embankment with micro-topography.

[0007] S11, build a social guide road on the completed embankment with micro-topography, located at the left foot of the slope, prepare the roadbed, compact the bottom soil to a compaction degree of not less than 0.95, lay 18cm thick 4% cement stabilized gravel and 18cm thick 3% cement stabilized gravel, compact to the specified density, lay a 6cm thick medium-grained modified asphalt concrete layer, and lay 4cm thick fine-grained asphalt concrete on the top, maintain the road width at 6m, and obtain the completed social road.

[0008] S12, in the completed social road area, restore the water supply and drainage system that was interrupted due to construction, lay DN200 and DN110 PE100 grade polyethylene pipes according to the designed route and depth, the foundation trench excavation depth is 1.2-1.8m, and a sand cushion layer with a thickness of 100-150mm is laid on the bottom. The pipe connection is made by hot-melt butt welding, and concrete module valve wells are installed at designated locations. Pressure testing and inspection are carried out to verify the integrity and functionality, and the public utility services have been restored.

[0009] Preferably, in step S3, the uniform spreading thickness of the topsoil is 20-30 cm.

[0010] Preferably, in step S8, the suitable soil material includes clay silt, silty clay and clay, and does not contain weeds and organic matter.

[0011] Preferably, in step S6, the size of the gabion is 2m×1m×1m.

[0012] The present invention provides a river channel structure obtained according to the above-mentioned river channel construction method.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are: The present invention improves the environmental adaptability and eco-friendliness of the construction. This method optimizes the utilization and protection of the topsoil and reduces environmental pollution by adopting mechanical operations in the cleaning and soil treatment stages. Controlling excavation parameters, such as depth and slope, effectively prevents slope collapse and enhances the structural stability of the river channel. In the construction of riverbed protection and drainage systems, the introduction of continuous wire mesh gabions and high-standard drainage facilities enhances the riverbed's anti-erosion ability and water flow management efficiency. The systematic design of the overall construction plan, such as micro-topography shaping and the construction of social guide roads, enhances the project's socio-economic contribution and the region's environmental aesthetics. These innovative means provide a more comprehensive and sustainable solution for river channel construction, improving the project's efficiency and environmental protection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the steps of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] See also Figure 1 The present invention provides a technical solution, a river channel construction method, comprising the following steps: S1, carry out the base clearing operation within the scope of the project, with a clearing depth of not less than 300mm, remove the surface vegetation and debris, use bulldozers and excavators to clear, expose the base layer, and obtain the cleaned base surface; S2, for the cleaned base surface, identify the soil layer that meets the conditions for topsoil stripping, use an excavator to strip the topsoil layer with an average thickness of 0.3m, prevent over-excavation, and stack the stripped topsoil separately from other materials. Remove plastic, metal, glass, stone and brick fragments through manual selection or mechanical screening, crush grass roots and straw and mix them evenly to obtain the processed planting topsoil; Specifically, the first step in the river channel construction method is to carry out the foundation clearing operation within the scope of the project, including deep clearing, removal of vegetation and debris. The construction team first uses bulldozers and excavators to comprehensively clean the designated project scope, ensuring that the clearing depth is not less than 300mm. During this process, the bulldozer is responsible for flattening and moving a large area of ​​surface materials, while the excavator is used to accurately dig and move the soil layer and debris in a specific area. All surface vegetation, roots, and gravel, waste, etc. that may affect the quality of the project are completely removed, exposing the underlying base layer. This operation not only ensures the smooth progress of subsequent work, but also prevents unstable foundations that may be caused by excessive excavation by accurately controlling the clearing depth. After cleaning, the resulting base surface will serve as the basis for subsequent construction. This clean and solid base is the key to ensuring the quality of the entire project.

[0017] In the second step of the river channel construction method, the cleaned substrate surface is processed. The construction team needs to identify the soil layer suitable for topsoil stripping, and this identification process relies on a comprehensive assessment of factors such as soil texture, moisture and structural stability. Once selected, the topsoil layer is stripped in a precisely controlled manner using an excavator, with an average thickness of 0.3 meters. This method not only protects the structure of the underlying soil, but also prevents unnecessary soil loss. The stripped topsoil is then piled separately from other materials. The topsoil is screened manually or mechanically to remove all non-soil components such as plastic, metal, glass, stone and brick fragments. At the same time, grass roots and straw are crushed and evenly mixed with the topsoil. This process enhances the quality of the topsoil and makes it more suitable for use as planting soil. After such treatment, the quality of the topsoil has been significantly improved, making it suitable for subsequent vegetation restoration and land use, while also providing a guarantee for the sustainable development of the environment around the river channel.

[0018] S3, use the treated planting topsoil in the designated planting area within the project, use a land grader or manually spread the topsoil evenly, and use a roller to compact the soil after it is leveled to eliminate air gaps, thus obtaining a laid planting soil layer; S4, in the paved planting soil layer, use excavators and dredging equipment to dig to the designed river channel depth and width, control the excavation slope between 1:1.5 and 1:2 to prevent slope collapse, and if groundwater is encountered, use open drainage or water collection well dewatering methods to ensure construction safety and obtain the excavated river channel; Specifically, in the third step of the river channel construction method, the treated planting topsoil is used in the designated planting area within the project. The construction team uses a grader or manual method to evenly lay the topsoil to ensure that the soil laying in the entire area reaches the predetermined uniformity and thickness. When laying with a grader, the operator will control the machine to move forward at a constant speed and pressure to maintain a uniform thickness of the soil layer. For manual laying, the construction workers will use rakes and shovels to fine-tune the soil distribution to ensure that there are no significant uneven places. Next, the laid soil layer is compacted using a roller. This step is to eliminate air gaps in the soil, increase soil density, and improve the stability and bearing capacity of the soil layer. During the compaction process, the roller will cover the same area multiple times to ensure that each part is evenly compacted. The completion of this operation not only provides an ideal soil environment for planting, but also plays an important role in preventing later soil settlement and increasing the success rate of plant growth.

[0019] In the fourth step of the river channel construction method, the river channel is excavated around the laid planting soil layer. The construction team uses excavators and dredging equipment to accurately excavate the depth and width of the river channel according to the design drawings, while controlling the excavation slope to be between 1:1.5 and 1:2 to ensure the stability of the slope and prevent collapse. During the excavation operation, the operator will adjust the excavation depth and speed according to the soil conditions and on-site monitoring data to ensure the accuracy of the river channel contour and the safety of construction. In the event of groundwater, the construction site will use open drainage or water collection wells for precipitation treatment. By setting up drainage pipes and water pumps, the water level of the working surface is effectively controlled to ensure the dryness of the construction area and avoid construction interruptions. These measures ensure the continuity and safety of the construction process, while ensuring the quality of the river channel project and the reliability of subsequent use.

[0020] S5, in the excavated river channel, build river steps on the left and right banks respectively, use C25W6F200 concrete to cast the steps, install and fix the formwork according to the designed size, cast concrete in layers according to the step height, and the thickness of each layer shall not exceed 500mm. Use a vibrator to vibrate and eliminate air gaps to ensure that the concrete is dense. After completion, perform curing for no less than 7 days to obtain the completed river steps; S6, protect the riverbed area adjacent to the completed riverbed steps, lay a wire gabion protection layer, place gabions filled with stones in the designated riverbed area, use galvanized steel wire to tie, connect and fix adjacent gabions, anchor them to the bottom of the riverbed, form a continuous protection layer, enhance the riverbed's ability to resist water impact, prevent erosion, and obtain a protected riverbed section; Specifically, in the fifth step of the river construction method, the steps down to the river are built. Before the construction begins, the technical team installs and fixes the formwork according to the design dimensions to ensure that the shape and size of the steps meet the design requirements. C25W6F200 concrete is used for pouring. The height of the steps determines that the concrete needs to be poured in layers, and the thickness of each layer is controlled within 500mm. This is to ensure that the concrete can better dissipate heat and reduce cracks during the hardening process. After the concrete is poured, a vibrator is used to vibrate each layer to eliminate air gaps and ensure the density and uniformity of the concrete. During the vibration process, pay attention to the uniform movement of the vibrator to avoid excessive concentration causing insufficient local density. After the steps are poured, they enter the maintenance stage, which lasts for no less than 7 days. This process is to ensure that the concrete is fully hydrated and achieves the expected strength and durability. Through these rigorous construction and maintenance steps, the structural safety and service life of the steps down to the river are ensured, providing a solid artificial access channel for the river.

[0021] In the sixth step of the river channel construction method, the riverbed area is protected. First, gabions filled with stones are placed in the riverbed area adjacent to the completed riverbed steps. The gabions are tied with galvanized steel wire to ensure the firmness and corrosion resistance of the structure. Then the adjacent gabions are connected and fixed by steel wire to form a continuous and solid protective layer. The bottom of the gabion needs to be anchored to the bottom of the riverbed. This measure is to enhance the overall structure's resistance to water flow and prevent the displacement of the gabion caused by water flow. Through this laying method, the gabion protective layer can effectively prevent the erosion of the riverbed by water flow and maintain the stability of the river channel. In addition, the stones in the pores of the gabion can buffer the water flow speed and reduce the force of the water flow directly impacting the river bank, thereby protecting the river bank from being eroded by the water flow. The construction results of this stage provide a long-term protective effect for the river channel, ensuring the stability of the riverbed and the maintenance of ecological balance.

[0022] S7, with the protected riverbed section as a reference, an off-embankment drainage system is constructed outside the embankment, C25 reinforced concrete drainage transfer wells are installed at designated locations, the foundation uses a 300mm thick C15 concrete cushion layer, four DN1800 and five DN800 concrete culverts are laid across the embankment, the culvert foundation uses a graded sand and gravel cushion layer, the pipe joints are sealed with rubber rings, and block stone slope protection is set at the outlet to prevent erosion and blockage, thus obtaining a completed drainage system; S8, using the appropriate soil material generated by the project excavation, fill the area between the upstream slope 1:4 and the downstream slope 1:3 as the backfill of Zone I, lay the fill material in layers with a thickness of 200mm, compact it with a roller or tamping machine, and the compaction degree of each layer reaches not less than 0.93. The compaction effect is verified by on-site density test to obtain the compacted embankment of Zone I; Specifically, in the seventh step of the river channel construction method, an off-embankment drainage system is constructed. First, a drainage transfer well made of C25 reinforced concrete is installed at the designated location. To ensure that the transfer well is stable and can withstand future loads, its foundation adopts a C15 concrete cushion with a thickness of 300mm. Subsequently, four DN1800 and five DN800 concrete culverts are laid in the embankment according to the design plan. These culverts cross the embankment to achieve effective management of water flow. The foundation of the culvert adopts a graded sand and gravel cushion to enhance the bearing capacity of the foundation and ensure the stability of the drainage pipe. At the pipe joints, rubber ring sealing technology is used to prevent water leakage and ensure the sealing and long-term operation efficiency of the entire drainage system. Block stone slope protection is set at the outlet, which not only prevents the erosion of the embankment foundation by water flow, but also avoids clogging of the drainage system. Through these refined construction operations, a set of efficient and stable drainage system is completed, ensuring the flood control and drainage functions of the entire river channel project and reducing the potential threat of environmental factors to the embankment.

[0023] In the eighth step of the river construction method, the upstream and downstream areas are filled. Using suitable soil generated during the excavation process of the project, the layers are laid in the area between the upstream slope of 1:4 and the downstream slope of 1:3, with a thickness of 200mm for each layer. Each layer of soil is compacted using a roller or tamping machine to ensure that the compaction degree of each layer reaches a standard of not less than 0.93. The compaction effect of each layer of soil is verified by field density testing to ensure the uniformity and stability of the soil. This layered compaction technology not only enhances the structural integrity of the embankment, but also effectively controls the settlement rate and water permeability of the soil. The completed backfill of Zone I provides a guarantee for the long-term stability and durability of the river embankment by providing a solid soil structure. The key to this step is to form an embankment that can withstand the impact of natural water flow and climate change by precisely controlling the filling and compaction process.

[0024] S9, beyond the 1:3 backslope of the compacted embankment in zone I, continue to use the same suitable soil material for filling to form the backfill of zone II, compact in layers, and achieve a compaction degree of not less than 0.91. This area is used to form a micro-topography landscape. The relative density of sandy soil is not less than 0.60, and a compacted embankment in zone II is obtained.

[0025] S10, micro-topography shaping is carried out on the compacted embankment in Zone II. According to the design plan, bulldozers and graders are used to create gentle slopes and undulating terrain with a slope of 1:5 to 1:10. The slope compaction degree reaches no less than 0.90 to prevent soil slippage and obtain a completed embankment with micro-topography.

[0026] Specifically, in the ninth step of the river channel construction method, the backfilling work of Zone II is continued. Use the appropriate soil materials excavated in the previous project to fill the area outside the 1:3 backwater slope to ensure that the soil materials used have sufficient bearing capacity and stability. The construction team uses the layered compaction method to work. The thickness of each layer is controlled within the specified range. A roller or tamping machine is used for compaction. The compaction degree of each layer must reach not less than 0.91. In addition, special attention is paid to the relative density of sandy soil to ensure that it is not less than 0.60. This indicator is key to improving the structural stability of the soil and preventing soil erosion. By precisely controlling the compaction degree and density of each layer, a compacted embankment in Zone II is formed. This embankment not only improves the efficiency of earthwork use, but also enhances the ecological and aesthetic value of the region through the design of micro-topography landscape.

[0027] In the tenth step of the river construction method, micro-topography shaping on the compacted embankment in Zone II is carried out. The construction team uses bulldozers and graders to create gentle slopes and undulating terrains with a slope of 1:5 to 1:10 according to the design plan. During the shaping process, it is ensured that the compaction degree of the slope is not less than 0.90 to prevent possible soil sliding in the future. Operators need to accurately control the movement speed and pressure of the machinery to ensure uniform compaction of the soil when forming the micro-topography. After completing these operations, the resulting embankment is not only functional, such as flood control and water flow control. The careful design and execution of these details ensure the long-term stability and functionality of the embankment, while also bringing positive ecological impacts to the local environment.

[0028] S11, build a social guide road on the completed embankment with micro-topography, located at the left foot of the slope, prepare the roadbed, compact the bottom soil to a compaction degree of not less than 0.95, lay 18cm thick 4% cement stabilized gravel and 18cm thick 3% cement stabilized gravel, compact to the specified density, lay a 6cm thick medium-grained modified asphalt concrete layer, and lay 4cm thick fine-grained asphalt concrete on the top, maintain the road width at 6m, and obtain the completed social road.

[0029] S12, in the completed social road area, restore the water supply and drainage system that was interrupted due to construction, lay DN200 and DN110 PE100 grade polyethylene pipes according to the designed route and depth, the foundation trench excavation depth is 1.8m, and a 150mm thick sand cushion layer is laid on the bottom. The pipes are connected by hot-melt butt welding, and concrete module valve wells are installed at designated locations. Pressure testing and inspection are carried out to verify the integrity and functionality, and the public utility services have been restored.

[0030] Specifically, in the eleventh step of the river channel construction method, a social guide road is constructed at the foot of the left slope. First, the roadbed is prepared to ensure that the underlying soil is fully compacted, with a compaction degree of not less than 0.95, to create a stable foundation to support the subsequent road structure. Then two layers of cement-stabilized gravel are laid, with the bottom layer being 18 cm thick 4% cement-stabilized gravel and the upper layer being 18 cm thick 3% cement-stabilized gravel. Each layer of gravel must be compacted to the specified density to ensure the firmness and durability of the road foundation. After completing the base layer, a 6 cm thick medium-grained modified asphalt concrete layer and a 4 cm thick fine-grained asphalt concrete layer are laid as the road surface. These materials provide good compression resistance and flatness, while maintaining a road width of 6 m to meet the needs of social traffic. Through these steps, a social road with a solid structure and a smooth surface is completed, which not only improves the traffic conditions in the area, but also enhances the social functionality and accessibility of the river channel area.

[0031] In the twelfth step of the river construction method, the water supply and drainage system that was interrupted by the construction was restored. The construction team laid DN200 and DN110 PE100 grade polyethylene pipes according to the designed lines and depths. These pipes have high corrosion resistance and long durability and are suitable for various underground environments. The excavation depth of the foundation trench is 1.8m, and a sand cushion layer with a thickness of 150mm is laid at the bottom, providing a uniform and stable support layer, which contributes to the long-term stability of the pipeline. The connection of the pipeline adopts hot-melt butt to ensure the sealing and mechanical strength of the connection and avoid the risk of leakage and rupture. Concrete module valve wells are installed at designated locations. In this way, the water flow can be controlled when necessary. After all installations are completed, pressure tests and system inspections are carried out to verify the integrity and functionality of the pipeline system. Through these operations, utility services have been restored, ensuring that the water system in the area can operate safely and efficiently to meet the daily needs of residents and industries, while providing the necessary infrastructure support for responding to possible emergencies.

[0032] In this embodiment, in step S3, the uniform spreading thickness of the topsoil is 30 cm.

[0033] In this embodiment, in step S8, suitable soil materials include clay silt, silty clay and clay, and do not contain weeds and organic matter.

[0034] In this embodiment, in step S6, the size of the gabion is 2m×1m×1m.

[0035] The present invention provides a river channel structure obtained according to the above-mentioned river channel construction method.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A river channel construction method, characterized in that: The following steps are involved: S1, carry out the base clearing operation within the scope of the project, with a clearing depth of not less than 300mm, remove the surface vegetation and debris, use bulldozers and excavators to clear, expose the base layer, and obtain the cleaned base surface; S2, for the cleaned base surface, identify the soil layer that meets the conditions for topsoil stripping, use an excavator to strip the topsoil layer with an average thickness of 0.3m, prevent over-excavation, and stack the stripped topsoil separately from other materials. Remove plastic, metal, glass, stone and brick fragments through manual selection or mechanical screening, crush grass roots and straw and mix them evenly to obtain the processed planting topsoil; S3, use the treated planting topsoil in the designated planting area within the project, use a land grader or manually spread the topsoil evenly, and use a roller to compact the soil after it is leveled to eliminate air gaps, thus obtaining a laid planting soil layer; S4, in the paved planting soil layer, use excavators and dredging equipment to dig to the designed river channel depth and width, control the excavation slope between 1:1.5 and 1:2 to prevent slope collapse, and if groundwater is encountered, use open drainage or water collection well dewatering methods to ensure construction safety and obtain the excavated river channel; S5, in the excavated river channel, build river steps on the left and right banks respectively, use C25W6F200 concrete to cast the steps, install and fix the formwork according to the designed size, cast concrete in layers according to the step height, and the thickness of each layer shall not exceed 500mm. Use a vibrator to vibrate and eliminate air gaps to ensure that the concrete is dense. After completion, perform curing for no less than 7 days to obtain the completed river steps; S6, protect the riverbed area adjacent to the completed riverbed steps, lay a wire gabion protection layer, place gabions filled with stones in the designated riverbed area, use galvanized steel wire to tie, connect and fix adjacent gabions, anchor them to the bottom of the riverbed, form a continuous protection layer, enhance the riverbed's ability to resist water impact, prevent erosion, and obtain a protected riverbed section; S7, with the protected riverbed section as a reference, build an off-embankment drainage system outside the embankment, install C25 reinforced concrete drainage transfer wells at designated locations, use C15 concrete cushion with a thickness of 200-300mm for the foundation, lay four DN1800 and five DN800 concrete culverts across the embankment, use graded sand and gravel cushion for the culvert foundation, use rubber rings to seal the pipe joints, set stone slope protection at the outlet to prevent erosion and blockage, and obtain a completed drainage system; S8, using the appropriate soil material generated by the project excavation, fill the area between the upstream slope 1:4 and the downstream slope 1:3 as the backfill of Zone I, lay the fill material with a thickness of 200-300mm in layers, compact it with a roller or tamping machine, and the compaction degree of each layer reaches not less than 0.

93. The compaction effect is verified by on-site density test to obtain the compacted embankment of Zone I; S9, beyond the 1:3 backslope of the compacted embankment in zone I, continue to use the same suitable soil material for filling to form the backfill of zone II, compact in layers, and achieve a compaction degree of not less than 0.

91. This area is used to form a micro-topography landscape. The relative density of sandy soil is not less than 0.60, and a compacted embankment in zone II is obtained.

2. The river channel construction method according to claim 1, characterized in that: Also includes: S10, micro-topography shaping is carried out on the compacted embankment in Zone II. According to the design plan, bulldozers and graders are used to create gentle slopes and undulating terrain with a slope of 1:5 to 1:

10. The slope compaction degree reaches no less than 0.90 to prevent soil slippage and obtain a completed embankment with micro-topography.

3. The river channel construction method according to claim 2, characterized in that: Also includes: S11, build a social guide road on the completed embankment with micro-topography, located at the left foot of the slope, prepare the roadbed, compact the bottom soil to a compaction degree of not less than 0.95, lay 18cm thick 4% cement stabilized gravel and 18cm thick 3% cement stabilized gravel, compact to the specified density, lay a 6cm thick medium-grained modified asphalt concrete layer, and lay 4cm thick fine-grained asphalt concrete on the top, maintain the road width at 6m, and obtain the completed social road.

4. The river channel construction method according to claim 3, characterized in that: Also includes: S12, in the completed social road area, restore the water supply and drainage system that was interrupted due to construction, lay DN200 and DN110 PE100 grade polyethylene pipes according to the designed route and depth, the foundation trench excavation depth is 1.2-1.8m, and a sand cushion layer with a thickness of 100-150mm is laid on the bottom. The pipe connection is made by hot-melt butt welding, and concrete module valve wells are installed at designated locations. Pressure testing and inspection are carried out to verify the integrity and functionality, and the public utility services have been restored.

5. The river channel construction method according to claim 1, characterized in that: In step S3, the topsoil is evenly spread to a thickness of 20-30 cm.

6. The river channel construction method according to claim 1, characterized in that: In step S8, the suitable soil material includes clay silt, silty clay and clay, and does not contain weeds and organic matter.

7. The river channel construction method according to claim 1, characterized in that: In step S6, the size of the gabion is 2m×1m×1m.

8. A river channel structure, characterized in that: Obtained according to the river channel construction method according to any one of claims 1-7.

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