A method and structure for river channel construction

Abstract

This invention relates to the field of river channel construction technology, specifically to a river channel construction method and structure, comprising the following steps: S1, conducting foundation clearing operations within the project area, clearing to a depth of not less than 300mm, removing surface vegetation and debris, using bulldozers and excavators for clearing, exposing the base layer, and obtaining a cleared base surface. This invention improves the environmental adaptability and eco-friendliness of construction. This method optimizes the utilization and protection of topsoil and reduces environmental pollution by using mechanical operations in the clearing 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 gabions and high-standard drainage facilities enhances the riverbed's erosion resistance and water flow management efficiency.

Description

Technical Field

[0001] This invention relates to the field of river construction technology, and in particular to a river construction method and structure. Background Technology

[0002] River construction technology encompasses a range of engineering techniques and methods used to construct, restore, or improve the physical structure and flow conditions of rivers and their tributaries. This field includes river excavation and dredging, levee construction, riverbed regulation, aquatic ecosystem restoration, and the implementation of flood control measures. Specific projects may involve the excavation of new river channels, the rerouting of existing channels, and the construction and maintenance of related hydraulic structures such as dams, gates, and pumping stations. Furthermore, river construction must consider water quality management, soil erosion control, and the protection of the surrounding ecological environment to ensure sustainable development and environmental friendliness.

[0003] Existing technologies for riverbed protection and drainage system construction often lack long-term, effective environmental protection measures, making projects susceptible to floods and erosion, thus affecting the functionality and safety of river channels. These technological limitations not only affect project quality and durability 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 this invention is to overcome the shortcomings of existing technologies and to propose a river channel construction method and structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a river channel construction method, comprising the following steps:

[0006] S1. Carry out clearing work within the scope of the project, with a clearing depth of not less than 300mm, remove surface vegetation and debris, and use bulldozers and excavators to clear the base layer and obtain the cleared base surface.

[0007] S2. On 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 to prevent over-excavation, separate the stripped topsoil from other materials and pile it up, remove plastic, metal, glass, stone and brick fragments by manual sorting or mechanical screening, crush grass roots and straw and mix them evenly to obtain the treated planting topsoil.

[0008] S3. The treated topsoil is used in the designated planting area within the project. The topsoil is spread evenly using a grader or manually. After the soil is leveled, it is compacted with a road roller to eliminate air gaps and obtain the laid planting soil layer.

[0009] S4. In the already laid topsoil layer, use excavators and dredging equipment to excavate to the designed river channel depth and width, control the excavation slope between 1:1.5 and 1:2 to prevent slope collapse. If groundwater is encountered, use open drainage or water collection well dewatering methods to ensure construction safety and obtain the excavated river channel.

[0010] S5. In the excavated river channel, construct one access step on each of the left and right banks. Use C25W6F200 concrete to pour the steps. Install and fix the formwork according to the design dimensions. Pour the concrete in layers according to the height of the steps, with each layer not exceeding 500mm in thickness. Use a vibrator to compact the concrete, eliminate air gaps, and ensure that the concrete is dense. After completion, cure for no less than 7 days to obtain the completed access steps.

[0011] S6. Protect the riverbed area adjacent to the completed lower river steps by laying a gabion protective layer. Place gabions filled with stones in the designated riverbed area, tie them with galvanized steel wire, connect and fix adjacent gabions, and anchor them to the bottom of the riverbed to form a continuous protective layer. This will enhance the riverbed's ability to resist water flow impact, prevent erosion, and obtain the protected riverbed section.

[0012] S7. Using the protected riverbed section as a reference, construct an external drainage system on the outside of the dike. Install C25 reinforced concrete drainage transfer wells at designated locations. The foundation uses a C15 concrete cushion layer with a thickness of 200-300mm. Lay four DN1800 and five DN800 concrete culverts across the dike. The culvert foundation uses a graded sand and gravel cushion layer. The pipe joints are sealed with rubber rings. A riprap slope is set at the outlet to prevent erosion and blockage, thus obtaining the completed drainage system.

[0013] S8 utilizes suitable soil material generated from project excavation to fill the area between the water-facing slope (1:4) and the back slope (1:3) as backfill for Zone I. The fill material is laid in layers with a thickness of 200-300mm and compacted using a road roller or rammer. The compaction degree of each layer reaches not less than 0.93. The compaction effect is verified through on-site density testing to obtain the compacted embankment of Zone I.

[0014] S9, outside the 1:3 backwater slope of the compacted embankment in Zone I, continue to use the same suitable soil material for filling to form the backfill of Zone II. The soil is compacted in layers, and the compaction degree reaches not less than 0.91. This area is used to form a micro-topographic landscape. The relative density of the sandy soil is not less than 0.60, thus obtaining the compacted embankment in Zone II.

[0015] 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 not less than 0.90 to prevent soil slippage and obtain a completed embankment with micro-topography.

[0016] S11, construct a public access road on the completed embankment with micro-topography. Located at the left slope toe, prepare the roadbed, compact the bottom soil to a compaction degree of not less than 0.95, lay an 18cm thick layer of 4% cement-stabilized crushed stone and an 18cm thick layer of 3% cement-stabilized crushed stone, compact to the specified density, lay a 6cm thick layer of medium-grained modified asphalt concrete, and lay a 4cm thick layer of fine-grained asphalt concrete on top, maintaining a road width of 6m, thus obtaining the completed public road.

[0017] S12, in the completed social road area, restore the water supply and drainage system interrupted by construction, lay DN200 and DN110 PE100 grade polyethylene pipes according to the designed route and depth, the trench excavation depth is 1.2-1.8m, the bottom is laid with a sand cushion layer with a thickness of 100-150mm, the pipe connection adopts the hot fusion butt method, install concrete module valve wells at the designated location, conduct pressure tests and inspections, verify integrity and functionality, and obtain the restored public utility services.

[0018] Preferably, in step S3, the uniform thickness of the topsoil is 20-30 cm.

[0019] Preferably, in step S8, the suitable soil material includes silty clay, silty clay and clay, and is free of weeds and organic matter.

[0020] Preferably, in step S6, the size of the gabion is 2m×1m×1m.

[0021] This invention provides a river channel structure, obtained according to the above-described river channel construction method.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0023] This invention improves the environmental adaptability and eco-friendliness of construction. This method optimizes topsoil utilization and protection through mechanized operations in the clearing and soil treatment stages, reducing environmental pollution. 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 gabions and high-standard drainage facilities enhances the riverbed's erosion resistance and water flow management efficiency. The systematic design of the overall construction plan, such as micro-topography shaping and the construction of social pathways, improves the project's socio-economic contribution and the area's environmental aesthetics. These innovative approaches provide a more comprehensive and sustainable solution for river construction, improving project efficiency and environmental protection performance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the steps of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] Please see Figure 1 This invention provides a technical solution, a method for river channel construction, comprising the following steps:

[0027] S1. Carry out clearing work within the scope of the project, with a clearing depth of not less than 300mm, remove surface vegetation and debris, and use bulldozers and excavators to clear the base layer and obtain the cleared base surface.

[0028] S2. On 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 to prevent over-excavation, separate the stripped topsoil from other materials and pile it up, remove plastic, metal, glass, stone and brick fragments by manual sorting or mechanical screening, crush grass roots and straw and mix them evenly to obtain the treated planting topsoil.

[0029] Specifically, the first step in the river channel construction method is to carry out foundation clearing work within the project area, including deep clearing, removal of vegetation and debris. The construction team first uses bulldozers and excavators to thoroughly clear the designated project area, ensuring a clearing depth of no less than 300mm. During this process, bulldozers are responsible for leveling and moving larger areas of surface material, while excavators are used to precisely excavate and move specific areas of soil and debris. All surface vegetation, roots, and debris such as gravel and waste that could affect the quality of the project are thoroughly removed, exposing the underlying base layer. This operation not only ensures the smooth progress of subsequent work but also prevents foundation instability that could be caused by over-excavation by precisely controlling the clearing depth. After clearing, the resulting base surface will serve as the foundation for subsequent construction; this clean and solid base is crucial to ensuring the overall quality of the project.

[0030] The second step in the river channel construction method involves treating the cleared base surface. The construction team needs to identify suitable soil layers for topsoil stripping, a process relying on a comprehensive assessment of factors such as soil texture, moisture content, and structural stability. Once selected, excavators are used to precisely control the stripping of the topsoil layer, maintaining an average stripping 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 separated from other materials and stockpiled. These topsoil layers are sifted manually or mechanically to remove all non-soil components, such as plastic, metal, glass, stones, and brick fragments. Simultaneously, grass roots and straw are pulverized and evenly mixed with the topsoil, a process that enhances the quality of the topsoil, making it more suitable for planting. This treatment significantly improves the quality of the topsoil, making it suitable for subsequent vegetation restoration and land use, while also ensuring the sustainable development of the surrounding environment of the river channel.

[0031] S3. The treated topsoil is used in the designated planting area within the project. The topsoil is spread evenly using a grader or manually. After the soil is leveled, it is compacted with a road roller to eliminate air gaps and obtain the laid planting soil layer.

[0032] S4. In the already laid topsoil layer, use excavators and dredging equipment to excavate to the designed river channel depth and width, control the excavation slope between 1:1.5 and 1:2 to prevent slope collapse. If groundwater is encountered, use open drainage or water collection well dewatering methods to ensure construction safety and obtain the excavated river channel.

[0033] Specifically, in the third step of the river channel construction method, the treated topsoil is used in designated planting areas within the project. The construction team uses graders or manual labor to evenly spread the topsoil, ensuring the soil layer achieves the predetermined uniformity and thickness throughout the area. When using graders, operators control the machinery to advance at a constant speed and pressure to maintain a uniform soil layer thickness. For manual spreading, workers use rakes and shovels to finely adjust the soil distribution, ensuring there are no significant uneven areas. Next, a roller is used to compact the spread soil layer. This step eliminates air gaps in the soil, increases soil density, and improves the stability and bearing capacity of the soil layer. During compaction, the roller covers the same area multiple times to ensure that each part is evenly compacted. This operation not only provides an ideal soil environment for planting but also plays a crucial role in preventing subsequent soil subsidence and improving the success rate of plant growth.

[0034] In the fourth step of the river channel construction method, excavation work is carried out around the laid topsoil layer. The construction team uses excavators and dredging equipment to precisely 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 slope stability and prevent collapse. During the excavation operation, operators adjust the excavation depth and speed based on soil conditions and on-site monitoring data to ensure the accuracy of the river channel outline and the safety of construction. If groundwater is encountered, the construction site will use open drainage or collection wells for dewatering. By setting up drainage pipes and water pumps, the water level at the working face will be effectively controlled to keep the construction area dry and avoid construction interruptions. These measures ensure the continuity and safety of the construction process, while also guaranteeing the quality of the river channel project and its reliability for subsequent use.

[0035] S5. In the excavated river channel, construct one access step on each of the left and right banks. Use C25W6F200 concrete to pour the steps. Install and fix the formwork according to the design dimensions. Pour the concrete in layers according to the height of the steps, with each layer not exceeding 500mm in thickness. Use a vibrator to compact the concrete, eliminate air gaps, and ensure that the concrete is dense. After completion, cure for no less than 7 days to obtain the completed access steps.

[0036] S6. Protect the riverbed area adjacent to the completed lower river steps by laying a gabion protective layer. Place gabions filled with stones in the designated riverbed area, tie them with galvanized steel wire, connect and fix adjacent gabions, and anchor them to the bottom of the riverbed to form a continuous protective layer. This will enhance the riverbed's ability to resist water flow impact, prevent erosion, and obtain the protected riverbed section.

[0037] Specifically, the fifth step in the river channel construction method involves building the access steps. Before construction begins, the technical team installs and fixes the formwork according to the design dimensions, ensuring that the shape and size of the steps meet the design requirements. C25W6F200 concrete is used for pouring. The height of the steps necessitates layered pouring, with each layer controlled to a thickness of no more than 500mm. This is to ensure better heat dissipation and reduce cracking during the hardening process. After the concrete is poured, each layer is vibrated to eliminate air gaps and ensure the density and uniformity of the concrete. During vibration, care is taken to move the vibrator evenly to avoid excessive concentration that could cause insufficient compaction in certain areas. After the steps are poured, a curing phase begins, lasting no less than 7 days. This process ensures that the concrete is fully hydrated and reaches the expected strength and durability. Through these rigorous construction and curing steps, the structural safety and service life of the access steps are ensured, providing a robust artificial access route to the river.

[0038] The sixth step in the river channel construction method involves protecting the riverbed area. First, gabions filled with stones are placed in the riverbed area adjacent to the completed lower river steps. The gabions are bound with galvanized steel wire to ensure structural strength and corrosion resistance. Adjacent gabions are then connected and secured with wire to form a continuous and robust protective layer. The bottom of the gabions is anchored to the riverbed bottom; this measure enhances the overall structure's resistance to water flow and prevents displacement caused by the flow. Through this laying method, the gabion protective layer effectively prevents water erosion of the riverbed and maintains the stability of the river channel. Furthermore, the stones in the gabions buffer the water flow velocity, reducing the direct impact of the water flow on the riverbank, thus protecting the riverbank from erosion. The results of this stage of construction provide long-term protection for the river channel, ensuring the stability of the riverbed and the maintenance of ecological balance.

[0039] S7. Using the protected riverbed section as a reference, construct an external drainage system on the outside of the dike. Install C25 reinforced concrete drainage transfer wells at designated locations. The foundation uses a 300mm thick C15 concrete cushion layer. Lay four DN1800 and five DN800 concrete culverts across the dike. The culvert foundation uses a graded sand and gravel cushion layer. The pipe joints are sealed with rubber rings. A riprap slope is set at the outlet to prevent erosion and blockage, thus obtaining the completed drainage system.

[0040] S8 utilizes suitable soil material generated from project excavation to fill the area between the water-facing slope (1:4) and the back slope (1:3) as backfill for Zone I. The fill material is laid in layers with a thickness of 200mm and compacted using a road roller or rammer. The compaction degree of each layer reaches not less than 0.93. The compaction effect is verified through on-site density testing, resulting in the compacted embankment of Zone I.

[0041] Specifically, in the seventh step of the river channel construction method, an external drainage system is constructed. First, drainage transfer wells made of C25 reinforced concrete are installed at designated locations. To ensure the stability of the transfer wells and their ability to withstand future loads, their foundations utilize a 300mm thick C15 concrete cushion layer. Subsequently, according to the design plan, four DN1800 and five DN800 concrete culverts are laid within the dike. These culverts traverse the dike to achieve effective water flow management. The culvert foundations utilize a graded gravel cushion layer to enhance the bearing capacity of the foundation and ensure the stability of the drainage pipes. Rubber ring sealing technology is used at pipe joints to prevent leakage, ensuring the airtightness and long-term operational efficiency of the entire drainage system. A riprap slope is installed at the outlet, which not only prevents water erosion of the dike foundation but also avoids blockage of the drainage system. Through these meticulous construction operations, an efficient and stable drainage system is completed, ensuring the flood control and drainage functions of the entire river channel project and reducing the potential threats of environmental factors to the dike.

[0042] In the eighth step of the river channel construction method, the upstream and downstream slopes are filled. Using suitable soil generated during the project excavation, layers of 200mm thick fill are laid between the 1:4 upstream slope and the 1:3 downstream slope. Each layer is compacted using a road roller or tamper to ensure a compaction degree of not less than 0.93. On-site density testing verifies the compaction effect of each layer, ensuring soil uniformity and stability. This layered compaction technique not only enhances the structural integrity of the embankment but also effectively controls soil settlement and water permeability. The completed backfilling of Zone I provides a robust soil structure, ensuring the long-term stability and durability of the embankment. The key to this step lies in precisely controlling the filling and compaction process to create a embankment capable of withstanding the effects of natural water flow and climate change.

[0043] S9, outside the 1:3 backwater slope of the compacted embankment in Zone I, continue to use the same suitable soil material for filling to form the backfill of Zone II. The soil is compacted in layers, and the compaction degree reaches not less than 0.91. This area is used to form a micro-topographic landscape. The relative density of the sandy soil is not less than 0.60, thus obtaining the compacted embankment in Zone II.

[0044] 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 not less than 0.90 to prevent soil slippage and obtain a completed embankment with micro-topography.

[0045] Specifically, in the ninth step of the river channel construction method, the backfilling work in Zone II continued. Suitable soil materials excavated from previous projects were used to fill areas beyond the 1:3 back slope, ensuring the soil had sufficient bearing capacity and stability. The construction team employed a layered compaction method, controlling the thickness of each layer within specified limits, and using road rollers or rammers for compaction, ensuring each layer achieved a compaction degree of not less than 0.91. Furthermore, special attention was paid to the relative density of the sandy soil, ensuring it was not less than 0.60; this indicator is crucial for improving the structural stability of the soil and preventing soil erosion. By precisely controlling the compaction degree and density of each layer, a compacted dike in Zone II was formed. This dike not only improved the efficiency of earthwork utilization but also enhanced the ecological and aesthetic value of the area through micro-topographical landscaping design.

[0046] In the tenth step of the river channel construction method, micro-topographic shaping was carried out on the compacted embankment in Zone II. The construction team used bulldozers and graders to create gentle slopes and undulating terrain with gradients ranging from 1:5 to 1:10, according to the design plan. During the shaping process, the compaction degree of the slope was ensured to reach no less than 0.90 to prevent potential soil slippage in the future. Operators needed to precisely control the movement speed and pressure of the machinery to ensure uniform compaction of the soil during the formation of the micro-topography. After these operations, the resulting embankment not only possessed functional properties, such as flood control and water flow control, but the meticulous design and execution of these details ensured the long-term stability and functionality of the embankment, while also bringing positive ecological impacts to the local environment.

[0047] S11, construct a public access road on the completed embankment with micro-topography. Located at the left slope toe, prepare the roadbed, compact the bottom soil to a compaction degree of not less than 0.95, lay an 18cm thick layer of 4% cement-stabilized crushed stone and an 18cm thick layer of 3% cement-stabilized crushed stone, compact to the specified density, lay a 6cm thick layer of medium-grained modified asphalt concrete, and lay a 4cm thick layer of fine-grained asphalt concrete on top, maintaining a road width of 6m, thus obtaining the completed public road.

[0048] S12, in the completed social road area, restore the water supply and drainage system interrupted by construction, lay DN200 and DN110 PE100 grade polyethylene pipes according to the designed route and depth, the trench excavation depth is 1.8m, the bottom is laid with a sand cushion layer with a thickness of 150mm, the pipe connection adopts the hot fusion butt method, install concrete module valve wells at the designated location, conduct pressure tests and inspections, verify integrity and functionality, and obtain the restored public utility services.

[0049] Specifically, in the eleventh step of the river channel construction method, a social access road is built at the left slope toe. First, the roadbed is prepared, ensuring the bottom soil is fully compacted to a compaction degree of not less than 0.95, creating a stable foundation to support the subsequent road structure. Then, two layers of cement-stabilized crushed stone are laid: an 18cm thick layer of 4% cement-stabilized crushed stone at the bottom and an 18cm thick layer of 3% cement-stabilized crushed stone at the top. Each layer of crushed stone is compacted to the specified density to ensure the strength and durability of the road foundation. After completing the foundation layer, a 6cm thick layer of medium-grained modified asphalt concrete and a 4cm thick layer of fine-grained asphalt concrete are laid as the road surface layer. These materials provide good compressive strength and smoothness while maintaining a road width of 6m to meet the needs of social traffic. Through these steps, a structurally robust and smooth social road is completed, improving not only the area's traffic conditions but also enhancing the social functionality and accessibility of the river channel area.

[0050] In the twelfth step of the river channel construction method, the water supply and drainage system interrupted by construction was restored. The construction team laid DN200 and DN110 PE100 grade polyethylene pipes according to the designed route and depth. These pipes are highly corrosion-resistant and durable, adaptable to various underground environments. The trench was excavated to a depth of 1.8m, with a 150mm thick sand cushion layer at the bottom, providing a uniform and stable support layer to contribute to the long-term stability of the pipeline. Pipe connections were made using hot-melt butt welding to ensure sealing and mechanical strength at the joints, avoiding the risk of leakage and rupture. Concrete modular valve wells were installed at designated locations, enabling water flow control when necessary. After all installations were completed, pressure tests and system checks were conducted to verify the integrity and functionality of the pipeline system. Through these operations, utility services were restored, ensuring the safe and efficient operation of the regional water system to meet the daily needs of residents and industries, while providing the necessary infrastructure support for responding to potential emergencies.

[0051] In this embodiment, in step S3, the uniform spreading thickness of the topsoil is 30cm.

[0052] In this embodiment, in step S8, suitable soil materials include clayey silt, silty clay and clay, which do not contain weeds and organic matter.

[0053] In this embodiment, in step S6, the size of the gabion is 2m×1m×1m.

[0054] This invention provides a river channel structure, obtained according to the above-described river channel construction method.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for river channel construction, characterized in that, Includes the following steps: S1. Carry out clearing work within the scope of the project, with a clearing depth of not less than 300mm, remove surface vegetation and debris, and use bulldozers and excavators to clear the base layer and obtain the cleared base surface. S2. On 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 to prevent over-excavation, separate the stripped topsoil from other materials and pile it up, remove plastic, metal, glass, stone and brick fragments by manual sorting or mechanical screening, crush grass roots and straw and mix them evenly to obtain the treated planting topsoil. S3. The treated topsoil is used in the designated planting area within the project. The topsoil is spread evenly using a grader or manually. After the soil is leveled, it is compacted with a road roller to eliminate air gaps and obtain the laid planting soil layer. S4. In the already laid topsoil layer, use excavators and dredging equipment to excavate to the designed river channel depth and width, control the excavation slope between 1:1.5 and 1:2 to prevent slope collapse. 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, construct one access step on each of the left and right banks. Use C25W6F200 concrete to pour the steps. Install and fix the formwork according to the design dimensions. Pour the concrete in layers according to the height of the steps, with each layer not exceeding 500mm in thickness. Use a vibrator to compact the concrete, eliminate air gaps, and ensure that the concrete is dense. After completion, cure for no less than 7 days to obtain the completed access steps. S6. Protect the riverbed area adjacent to the completed lower river steps by laying a gabion protective layer. Place gabions filled with stones in the designated riverbed area, tie them with galvanized steel wire, connect and fix adjacent gabions, and anchor them to the bottom of the riverbed to form a continuous protective layer. This will enhance the riverbed's ability to resist water flow impact, prevent erosion, and obtain the protected riverbed section. S7. Using the protected riverbed section as a reference, construct an external drainage system on the outside of the dike. Install C25 reinforced concrete drainage transfer wells at designated locations. The foundation uses a C15 concrete cushion layer with a thickness of 200-300mm. Lay four DN1800 and five DN800 concrete culverts across the dike. The culvert foundation uses a graded sand and gravel cushion layer. The pipe joints are sealed with rubber rings. A riprap slope is set at the outlet to prevent erosion and blockage, thus obtaining the completed drainage system. S8 utilizes suitable soil material generated from project excavation to fill the area between the water-facing slope (1:4) and the back slope (1:3) as backfill for Zone I. The fill material is laid in layers with a thickness of 200-300mm and compacted using a road roller or rammer. The compaction degree of each layer reaches not less than 0.

93. The compaction effect is verified through on-site density testing to obtain the compacted embankment of Zone I. S9, outside the 1:3 backwater slope of the compacted embankment in Zone I, continue to use the same suitable soil material for filling to form the backfill of Zone II. The soil is compacted in layers, and the compaction degree reaches not less than 0.

91. This area is used to form a micro-topographic landscape. The relative density of the sandy soil is not less than 0.60, thus obtaining the compacted embankment in Zone II.

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 not 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, construct a public access road on the completed embankment with micro-topography. Located at the left slope toe, prepare the roadbed, compact the bottom soil to a compaction degree of not less than 0.95, lay an 18cm thick layer of 4% cement-stabilized crushed stone and an 18cm thick layer of 3% cement-stabilized crushed stone, compact to the specified density, lay a 6cm thick layer of medium-grained modified asphalt concrete, and lay a 4cm thick layer of fine-grained asphalt concrete on top, maintaining a road width of 6m, thus obtaining the completed public 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 interrupted by construction, lay DN200 and DN110 PE100 grade polyethylene pipes according to the designed route and depth, the trench excavation depth is 1.2-1.8m, the bottom is laid with a sand cushion layer with a thickness of 100-150mm, the pipe connection adopts the hot fusion butt method, install concrete module valve wells at the designated location, conduct pressure tests and inspections, verify integrity and functionality, and obtain the restored public utility services.

5. The river channel construction method according to claim 1, characterized in that: In step S3, the topsoil is spread evenly 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 silty clay, silty clay and clay, and is free of weeds and organic matter.

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

8. A river channel structure, characterized in that, The method for constructing a river channel is obtained according to any one of claims 1-7.

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