Efficient sludge treatment system based on amphibious dredger and construction method

Abstract

The invention relates to an efficient sludge treatment system based on an amphibious dredger and a construction method, and relates to the technical field of lake sludge treatment, the system comprises a low-disturbance reamer module, a slipway module, a pipeline conveying module, an agent mixing module, a pipe bag filling module and a consolidation anti-seepage storage yard module, S1, construction preparation; s2, adding medicaments for preparation; s3, excavation is conducted in a striping mode; s4, pipeline installation and slurry conveying; s5, sludge pumping and discharging; s6, dehydrating and curing on site; s7, earth covering and backfilling are conducted on site, a novel amphibious dredger is adopted to replace traditional equipment, a unique cutter system of the novel amphibious dredger can treat stone blocks and sludge at a time, and the stone blocks and the sludge are directly conveyed to a sludge filling area after being minced; the high-toughness polypropylene geotextile pipe bag is filled with sludge, and an adaptive agent is added into a pipeline to realize full mixing, so that the sludge consolidation efficiency is remarkably improved; the geotextile tube bags and the chemical adding device are arranged on the bank side, a layered stacking and consolidation mode is adopted, and finally, soil covering and plant growing are conducted to form the ecological bank slope, so that the construction cost is reduced, and the landscape effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of lake sludge treatment, and in particular to an efficient sludge treatment system and construction method based on an amphibious dredger. Background Art

[0002] In the dredging construction of waterways for waterway construction projects, traditional technology generally uses long-arm excavators or floating excavators to excavate the silt, which is then transported to the shore by barge for drying. Conventional silt treatment methods include natural dehydration and degradation and mechanical dehydration and degradation.

[0003] The above process requires transporting silt to the drying yard multiple times during the construction process, which is inefficient and requires a large amount of space. For silt dehydration, natural drying takes a long time and occupies a large area. Mechanical dehydration equipment is expensive and complicated to operate. At the same time, when existing cutter suction dredgers are used, the silt has a high moisture content, low treatment efficiency, and is prone to damage to the river ecology.

[0004] In view of the above-mentioned related technologies, a solution is now proposed. Summary of the Invention

[0005] The purpose of this application is to provide an efficient sludge treatment system and construction method based on an amphibious dredger to solve the technical problems in the existing technology, such as large traditional process site requirements, long construction period, low sludge dewatering efficiency, high equipment investment cost, easy to generate secondary pollution, and insufficient processing capacity of existing dredgers for hard soil layers.

[0006] The present application provides an efficient silt treatment system and construction method based on an amphibious dredger, which adopts the following technical solutions: An efficient silt treatment system based on an amphibious dredger, comprising a low-disturbance reamer module, a slipway module, a pipeline transport module, a reagent mixing module, a tube bag filling module, and a consolidation and anti-seepage yard module; Low-disturbance reamer module: This module consists of a rotating reamer at the front end of the amphibious dredger, used to cut hard soil layers, rocks and silt to form a mud-water mixture. The reamer uses a fan-shaped horizontal excavation method to perform excavation operations in strips; Slipway module: After locating the position through observation values, this module uses HYPACK software to process the data through a computer, and displays the designed dredging section contour line, designed trench edge line, auger dredging operation track and real-time navigation data; Pipeline transportation module: This module consists of a mud discharge pipeline, steel pipe, floating pipe and rubber flexible connecting pipe. The steel pipe and floating pipe are anchored in both directions every 100m. A dosing and mixing node is set in the mud transportation path, and the end point is connected to the mud bag filling yard. Chemical mixing module: This module uses integrated dosing equipment and pipeline injection to add chemicals into the sludge slurry conveying pipeline. The chemicals are made of a mixture of polyacrylamide cations and PC flocculants. The polyacrylamide cations are dissolved in river water at a concentration of 6‰, with a volume ratio of solution to mud of 1:5. The PC flocculants are dissolved in river water at a concentration of 10%, with a volume ratio of solution to mud of 1:12.5. After the polyacrylamide cations and PC flocculants are dissolved, they are added to the mud, and then the solution is added to the mud treatment tank. Tube bag filling module: This module uses high-toughness polypropylene to fill geotechnical tube bags, which are filled in layers three times, dehydrated for two days each time, and the dehydration and solidification status is recorded. The surface of the tube bag is regularly tapped to accelerate drainage; Consolidation anti-seepage yard module: This module is used to place the pipe bags and collect and drain the seepage sewage. A circular drainage ditch is provided around the yard. The surface layer of the foundation of the yard is treated for anti-seepage, and the water filtered out by the pipe bags is collected through the drainage ditch and then enters the filtrate collection pool.

[0007] By adopting the above technical solution, the system uses the rotating reamer of the low-disturbance reamer module to cut and crush hard soil layers, boulders and silt, forming a uniform mud-water mixture. Its fan-shaped horizontal excavation operation mode can reduce disturbance to the riverbed structure while improving excavation efficiency. The slipway module uses DGPS differential positioning and HYPACK software for collaborative processing to achieve real-time visual navigation of the dredging trajectory, ensuring that the construction accuracy is controlled within 1m; The pipeline transportation module uses a flexible connection design between floating pipes and steel pipes, combined with a bidirectional anchoring structure with a spacing of 100m, to effectively resist water flow impact and maintain the stability of mud transportation. The reagent mixing module adopts a composite ratio of polyacrylamide cations and PC flocculants, which can achieve uniform mixing of reagents and slurry through pipeline injection, significantly improving the flocculation effect. The tube bag filling module uses a high-toughness polypropylene tube bag with an equivalent pore size of 0.5mm and a 25L / m 2 The permeability of / s balances the dehydration speed and fine particle retention rate. The operation strategy of layered filling combined with intermittent dehydration can avoid the risk of tube bag bursting; The consolidated anti-seepage yard module uses a composite anti-seepage structure of "HDPE membrane + non-woven geotextile + crushed stone layer" and a drainage system of a circular drainage ditch to achieve efficient dehydration while preventing secondary pollution.

[0008] Preferably, the low-disturbance reamer module determines the order of anchoring according to the wind flow, first dropping the upwind anchor and the upstream anchor, so that the low-disturbance reamer module is moved to the edge line of one side of the digging bar, and the low-disturbance reamer module is lowered and lowered to fix the hull. At the same time, after dropping the anchor, the transverse cable is tightened, and after confirming that the upwind anchor and the upstream anchor have grasped the mud, the low-disturbance reamer module is lifted out of the mud surface, and the wind flow is used to move the amphibious dredger to the edge line on the other side of the digging bar for operation.

[0009] By adopting the above technical solution, the anchoring operation of the low-disturbance reamer module is optimized and controlled by the wind flow guidance principle, which is specifically manifested as follows: when the dredger enters the construction area, the direction of the dominant environmental force is first determined based on the real-time wind and water flow direction, and the transverse anchor is preferentially dropped on the upwind and upstream sides of the dredging strip. At this time, the reamer is synchronously lowered to the edge of the dredging strip to form an initial positioning fulcrum; during the anchoring process, the anchor rod and the centerline of the hull maintain a 45° angle to balance the lateral tension, and after the anchor claw is fully embedded in the riverbed, the transverse cable is tightened to form a stable anchoring system. At this time, the reamer is lifted off the mud surface to release the positioning constraint; then, the wind flow and hydrodynamics or the auxiliary anchor boat are used to tug the hull along a fan-shaped trajectory with the positioning pile as the center and the ship length as the radius to the other side of the dredging strip, completing the symmetrical anchoring arrangement. This technical solution achieves precise positioning and rapid movement of the hull through the synergistic effect of environmental forces and mechanical forces, which not only ensures the stability of the auger when excavating hard soil layers, but also effectively suppresses the ship's position drift caused by water impact through the two-way mooring system. The overlap accuracy of the fan-shaped horizontal excavation method is controlled within the range of 1-2m, significantly improving the continuous excavation efficiency of hard soil layers under complex hydrological conditions.

[0010] Preferably, the slipway module is connected to a land reference station through data, and the land reference station obtains the observation value correction number through satellite, so that the observation value of the slipway module is corrected in real time to obtain the coordinates of the ship position where the slipway is located. At the same time, the slipway is connected to a water level telemeter and a reamer depth indicator to display the excavation depth in real time.

[0011] By adopting the above technical solution, the ship platform module establishes a data connection with the land base station through the DGPS differential positioning system, and calculates the pseudo-range error Δ using the geometric distance between the known precise coordinates of the base station and the satellite signal. ρ, through real-time transmission of correction numbers, high-precision correction of slipway observation values ​​is achieved, making the positioning accuracy better than 1 meter; at the same time, the module integrates the data interface of water level telemeter and reamer depth indicator, and displays the real-time dredging depth and water level data in conjunction with the electronic navigation interface of HYPACK software, forming a three-dimensional operation navigation system including the dredging edge line and reamer trajectory. Its technical effect is: through the fusion of satellite differential positioning and multi-sensor data, it not only solves the positioning drift problem of traditional dredgers under complex hydrological conditions, but also realizes the digital visualization matching of dredging depth control and construction contour, ensures the strip division accuracy of fan-shaped horizontal excavation method and the boundary control of 35m segment construction, and provides spatial reference support for the precise cutting of low-disturbance reamer module. At the same time, the design is realized through (A T A) -1 A T L-matrix operations optimize the impact of satellite geometric distribution on coordinate solution, significantly reduce residual error ∈, improve the robustness of the system in occluded environments, and make the slipway module the core control hub connecting positioning, excavation and pipeline transportation.

[0012] Preferably, the land reference station is connected to the coordinates (x0, y0, z0) provided by the satellite by the known precise coordinates (x s ,y s , z s ) Calculate the pseudorange error, the calculation formula is: in, represents the satellite pseudorange observation value measured by the land reference station; represents the true geometric distance between the satellite and the land reference station; Δ ρ The observation value correction number is transmitted to the ship platform module in real time through data transmission. The ship platform module receives the correction number Δ ρ Then coordinate correction is performed, and the calculation formula of the coordinate correction is as follows: Δ x =(A T A) -1 A T L; Among them, ρ ship represents the corrected observation value; represents the original pseudorange observation value received by the ship platform module; represents the true geometric distance between the satellite and the platform module; ∈ represents the residual error; Δ x represents the coordinate correction amount; A represents the design matrix composed of the geometric distance and the partial derivative of the coordinates of the slipway module; A T L represents the residual vector; (A T A)-1 Indicates the influence of the satellite geometric distribution on the solution accuracy; eliminate the common error Δ by the combination of the above formulas ρ The residual error ∈ is significantly reduced, and the robustness of the coordinate solution is optimized through redundant observations of 4 satellites.

[0013] The pipeline transportation module adopts a 6m steel pipe to pass through a buoy-type floating pipe, and the steel pipes are flexibly connected with a 1.5m long rubber pipe. The floating pipe laying line is streamlined and curved. The steel pipe and the floating pipe are positioned by dropping small anchors in both directions every 100m, and the amphibious dredger sucks up the mud and directly transports it to the mud filling area through the mud discharge pipe. By adopting the above scheme, by adopting the above technical scheme, based on the collaborative work of the DGPS differential positioning system and the HYPACK software, the slipway module establishes a pseudo-range error correction model through the geometric relationship between the land reference station and the satellite, using the formula: Accurately calculate the observation value correction number, eliminate the common errors such as ionospheric delay and satellite clock error in real time, combine the redundant observation data of four satellites, and use the coordinate correction formula Δ x =(A T A) -1 A T L optimization solution process makes the positioning accuracy of the slipway stable within 1 meter, ensuring the high matching of the cutter operation trajectory with the electronic navigation map; at the same time, the pipeline transportation module adopts a segmented floating pipe structure, which forms a streamlined flexible pipeline by alternately connecting 6-meter steel pipes and 1.5-meter rubber pipes. Small anchors are dropped in both directions at every 100-meter node to effectively suppress the pipeline swing amplitude caused by water flow impact, so that the floating pipe bending radius is maintained in the optimal hydraulic state. Combined with the rigid support of the steel pipe and the active compensation characteristics of the rubber pipe, the mud transportation flow rate is guaranteed to be stable at 1.8m 3 The design value of / min significantly reduces the risk of interface detachment caused by pipeline vibration. The operating trajectory of the amphibious dredger and the mud conveying system form spatial coordination, jointly realizing the precise excavation of hard soil layers and the continuous and stable delivery of high-water content mud.

[0014] Preferably, in the drug mixing module, three integrated dosing devices are provided, and a double-layer agitator is provided on the top of each integrated dosing device. After the drug is dissolved, it is transported to the dosing mixing pipeline by a mechanical diaphragm dosing pump and injected into the tube bag laid in advance in the yard.

[0015] By adopting the above technical solution, the reagent mixing module adopts three independent dissolving tanks in parallel to form a redundant configuration. Each dissolving tank is equipped with a double-layer counter-rotating agitator to achieve three-dimensional disturbance of the reagent dissolution process. The upper stirring paddle adopts a pitch-blade turbine structure to generate axial flow to enhance the diffusion of the dissolving agent. The lower stirring paddle adopts an anchor structure to eliminate the sedimentation at the bottom of the tank. The stirring rate adopts frequency conversion control to achieve adaptive adjustment of different viscosity liquids. The dissolved liquid is evenly injected into the mud conveying main pipeline through the annular distribution pipe by a corrosion-resistant mechanical diaphragm pump. The microscopic mixing of the reagent and the mud is achieved in the pipeline mixer through the turbulent shear effect. Mixing, this design ensures the precise control of the dosage of the reagent through the synergistic effect of the modular dosing unit and the dynamic mixing device, and realizes the full contact reaction between the mud and the reagent, effectively avoiding the uneven distribution of the reagent in traditional static mixing. At the same time, the alternating operation mode of the three dissolving tanks can ensure the stability of the reagent supply during continuous operation, and the dosing pump with a double-layer mechanical seal structure prevents the risk of leakage of high-concentration reagents during the transportation process. The entire system realizes closed-loop control of the dosage through pipeline pressure monitoring and flow feedback, which significantly improves the homogenization degree of the solid-liquid separation reaction during the sludge treatment process.

[0016] Preferably, in the tube bag filling module, the tube bag filling is carried out according to the previous field experiments, and the sludge from three groups of sampling points is combined and sampled. After being treated with the agent, it is filled into the tube bag to record the dehydration speed, consolidation effect and leachate conditions. At the same time, the moisture content of the sludge after dehydration is detected, and the moisture content is controlled within 75%.

[0017] By adopting the above technical scheme, the sludge at different sampling points is sampled together and then uniformly subjected to agent adaptation treatment to ensure that the agent ratio is accurately matched with the sludge properties. Through layered multiple filling combined with periodic dehydration operations, regular patting treatment is implemented on the surface of the tube bag to effectively accelerate the drainage speed. At the same time, the leachate discharge indicators and moisture content parameters after consolidation are monitored in real time. This not only achieves unified and standardized treatment of sludge in multiple areas, but also ensures uniform stress distribution inside the tube bag through layered and progressive filling. Combined with surface physical intervention measures, it effectively avoids the influence of the silt adhesion layer on drainage efficiency. On the basis of ensuring uniform and stable consolidation effect, a full-process quality control node is established to systematically control the moisture content of the dehydrated sludge within the technical standard of 75%. At the same time, the dynamic monitoring mechanism of leachate is used to prevent the risk of secondary pollution, forming a tube bag dehydration and consolidation technology system with high standardization and controllable quality.

[0018] Preferably, in the consolidation and anti-seepage yard module, the construction sequence of the consolidation yard is as follows: A1. Earthwork excavation: Excavate the site according to the design requirements, remove surface vegetation and obstacles, and excavate and transport earthwork according to the designed elevation and slope; A2. Construction of retaining dams: Build retaining dams around the excavation area or at key locations, using earth and stone to compact the dam body in layers. A3. Digging drainage ditches: Dig drainage ditches along the site perimeter or in low-lying areas to collect surface runoff and groundwater and direct them to sedimentation ponds. A4. Site leveling and compaction: Level and compact the excavated base using a roller for layered compaction, replacing weak areas with gravel. A5. Constructing an anti-seepage system layer: laying a 200mm gravel drainage layer on the compacted site, and then laying a HDPE membrane and non-woven geotextile on the gravel drainage layer.

[0019] By adopting the above technical solution, during the earthwork excavation stage, surface vegetation and obstacles are removed and excavation is carried out accurately according to the designed elevation to ensure that the base bearing capacity meets the yard requirements; a layered and compacted earth and rock retaining dam is built to effectively improve the stability of the dam structure and prevent the lateral sliding of the pipe bag load; a drainage ditch system surrounding the excavation is combined with a sedimentation tank to achieve the diversion and collection of surface runoff and leachate; the site is leveled by layered compaction by a roller and partial replacement of gravel to prevent sharp objects from piercing the anti-seepage layer and ensure uniform stress on the pipe bag; finally, a 200mm gravel drainage layer and a 600g / m 2 The multi-layer composite structure of non-woven geotextile and 1.5mm HDPE anti-seepage membrane not only rapidly drains leachate but also forms a three-dimensional anti-seepage barrier, effectively preventing pollutant migration. This construction sequence, through a clearly defined process flow, creates a yard system with efficient drainage, stable load-bearing capacity, and strict anti-seepage capabilities, ensuring a stable, controllable, and environmentally friendly dehydration and consolidation process for the tube bags.

[0020] A construction method for an efficient silt treatment system based on an amphibious dredger comprises the following steps: S1. Construction preparation: Complete personnel training and equipment access route survey, conduct original mud surface measurement and soil layer analysis according to technical specifications, determine the dredging plan, and level and clean the geotube dewatering site; S2. Preparation of additives: Conduct a tube bag filling test to observe the floc size, degree of breakage, and sedimentation rate of the sludge reaction under the same conditions, and determine the appropriate sludge agent and the amount of sludge agent to be added for formulation; S3. Strip excavation: The amphibious dredger enters the site and positions itself, commencing operations within each construction area. Strip excavation is carried out using the principle of fan-shaped horizontal excavation. Based on the effective horizontal width of the amphibious dredger, the river channel is divided into sections of 35m in length and the width of the river channel along the river flow direction. S4. Pipeline installation and mud transportation: strictly control the swing amplitude of the floating pipe and the smoothness of the line. Drop small anchors every 100m in both directions to position the mud. Suck up the mud and transport it directly to the filling area through the pipeline by the dredger. The established delivery power of the dredger is 1.8m 3 / min; S5. Sludge Pumping: First, prepare a sludge slurry with a relatively high water content. Use an integrated dosing device and pipe injection to add the agent to the sludge slurry delivery pipeline. The dosage is 1.3 kg / TDS. After the agent is dissolved, it is transported to the dosing mixing pipeline by a mechanical diaphragm dosing pump and injected into the tube bags laid out in advance in the storage yard. The tube bags are filled in layers. Each time, the filling is stopped after the tube bag can no longer be filled with sludge. After dehydration for 2 days, the bag is filled again. Each tube bag is filled a total of 3 times. S6. On-site dehydration and curing: During the dehydration process of the tube bag, workers scrub the surface of the tube bag at regular intervals. The generated leachate passes through the gravel layer and the filtrate collection ditch into the filtrate collection tank, and is discharged into the nearby municipal sewage network after sedimentation and testing. S7. On-site backfilling: After a period of sedimentation and drainage, the tube bag forms a solid capsule. When the height of the mud-filled tube bag is stable and no longer changes, the silt in the tube bag is sampled and sent for inspection. After passing the inspection, the soil can be covered and the tube bag can be used to store the soil excavated during the site construction.

[0021] By adopting the above technical solution, the efficient dredging of amphibious dredgers and the geotextile tube bag consolidation process system are integrated to form a complete construction chain: in the construction preparation stage, the excavation area is accurately divided through the original mud surface measurement and soil layer analysis, and the DGPS positioning technology is combined to realize the real-time visual control of the dredger's operation trajectory to ensure the construction accuracy of river dredging; when the fan-shaped horizontal excavation method is used for strip excavation, the parameter setting of 35m standardized segments and 1-2m overlap width is used to effectively balance the construction efficiency and excavation integrity, and reduce the risk of missing excavation when excavating hard soil layers; The floating pipe in the road transport module adopts a flexible structural design with 6m steel pipes and 1.5m rubber pipes connected at intervals, combined with bidirectional anchoring measures at 100m intervals, to ensure the continuity of mud transportation and reduce pipeline deviation caused by water impact; during the sludge extraction stage, three-layer filling and interval dehydration operations are carried out, combined with precise addition of chemicals and periodic tapping of the pipe bag surface to achieve a step-by-step increase in the silt consolidation rate; during the final backfill, infrastructure earthwork is used for ecological treatment, and the long-term stability of the pipe bag solid body is ensured by limiting the depth of plant roots and load requirements.

[0022] Preferably, in step S1, an on-site survey of the riverbed silt situation is conducted before construction, and a riverbed silt treatment construction plan is prepared. Simultaneously, silt and water quality samples are taken for inspection, and a sludge bag filling yard is constructed according to the construction plan.

[0023] By adopting the above technical scheme, a special survey of silt distribution and properties is carried out before construction based on the river topographic map and geological survey report, with sampling points set up in areas prone to siltation such as channel bends and around revetment structures. Combined with on-site water level, flow velocity and other working conditions, a comprehensive treatment plan is formulated, including silt stratification sampling evaluation, agent adaptation test plan, filling bag layout density and yard anti-seepage layer structure details. The dredger route and floating pipe laying path are planned in advance to ensure that the silt extraction path and the bag filling operation surface form a spatial matching relationship. According to the yard construction specifications, the quality acceptance of site leveling, compaction and anti-seepage membrane laying is completed in advance to ensure the effectiveness of the leachate collection system and anti-seepage structure during the dehydration and consolidation stage of the geotube bag. This technical solution realizes the precise pre-control of construction resource allocation and process parameters through preliminary investigation and systematic scheme design, effectively avoiding the construction interruption problem caused by sudden changes in site conditions or differences in silt properties in traditional processes, and provides a standardized implementation basis for subsequent low-disturbance suction, precise addition of chemicals and layered filling operations, ensuring the coordination and controllability of the entire construction process.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. A new amphibious dredger replaces traditional long-arm excavators or cutter suction dredgers. Its unique cutter system can handle hard soil layers, boulders, and silt, directly crushing them and transporting them to the onshore filling area, eliminating the need for multiple equipment for multiple disposals. 2. River silt is filled into high-toughness polypropylene mud-filled geotextile bags, and an adapted agent from on-site silt testing for the project is added to the conveying pipeline. This ensures thorough mixing of the agent and silt, achieving rapid consolidation and degradation of the silt. The simple operation reduces the investment in dewatering machinery and equipment for the project, and improves the silt treatment efficiency of the project. 3. The geotube bags and dosing devices are set up on the river bank, and the next layer of geotube bags is stacked on top of the consolidated geotube bags to consolidate them. An ecological bank slope is formed by covering the soil with vegetation, which reduces the project's external construction costs and improves the river landscape. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a construction process flow chart of the efficient silt treatment system and construction method based on an amphibious dredger in this application; Figure 2 This is a module diagram of the efficient silt treatment system based on an amphibious dredger in this application.

[0026] Explanation of the accompanying symbols: 1. Low-disturbance reamer module; 2. Slipway module; 3. Pipeline transportation module; 4. Chemical mixing module; 5. Tube bag filling module; 6. Consolidation and anti-seepage yard module. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 -Attached Figure 2 , further details of this application are given.

[0028] The embodiments of the present application disclose an efficient sludge treatment system and a construction method based on an amphibious dredger.

[0029] Reference Figure 1 and Figure 2 The silt efficient treatment system based on an amphibious dredger is characterized in that the system includes a low-disturbance reamer module 1, a slipway module 2, a pipeline transportation module 3, a reagent mixing module 4, a tube bag filling module 5, and a consolidation and anti-seepage yard module 6; Low-disturbance reamer module 1: This module consists of a rotary reamer configured at the front end of the amphibious dredger, used to cut hard soil layers, rocks and silt to form a mud-water mixture. The reamer uses a fan-shaped horizontal excavation method to perform excavation operations in strips; Slipway module 2: After locating the position through observation values, this module uses HYPACK software to process the data through a computer, and displays the designed dredging section contour line, designed trench edge line, auger dredging operation track and real-time navigation data; Pipeline transportation module 3: This module consists of a mud discharge pipeline, steel pipe, floating pipe and rubber flexible connecting pipe. The steel pipe and floating pipe are anchored in both directions every 100 meters. A dosing and mixing node is set in the mud transportation path, and the end point is connected to the mud bag filling yard. Reagent mixing module 4: This module uses integrated dosing equipment and pipeline injection to add reagents to the sludge slurry conveying pipeline. The reagent is made of a mixture of polyacrylamide cations and PC flocculants. The polyacrylamide cations are dissolved in river water at a concentration of 6‰, and the volume ratio of the solution to the mud is 1:5. The PC flocculants are dissolved in river water at a concentration of 10%, and the volume ratio of the solution to the mud is 1:12.5. After the polyacrylamide cations and PC flocculants are dissolved, they are added to the mud, and then the solution is added to the mud treatment tank. Tube bag filling module 5: This module uses high-toughness polypropylene to fill geotechnical tube bags, which are filled in layers three times, dehydrated for two days each time, and the dehydration and solidification status is recorded. The surface of the tube bag is regularly tapped to accelerate drainage; Consolidation anti-seepage yard module 6: This module is used to place the pipe bags and collect and drain the seepage sewage. A circular drainage ditch is provided around the yard. The surface layer of the foundation of the yard is treated for anti-seepage, and the water filtered out by the pipe bags is collected through the drainage ditch and then enters the filtrate collection pool.

[0030] Specifically, the implementation of this system is based on an innovative architecture that combines the collaborative operation of an amphibious dredger and geotube bags. The low-disturbance reamer module 1 uses a fan-shaped horizontal excavation method for strip-type operations. The rotary reamer configured at the front end of the amphibious dredger is made of high-strength alloy steel, and its blades are arranged in a spiral to reduce cutting resistance. It cuts hard soil layers and rocks at a speed of 8 revolutions per minute. At the same time, the negative pressure generated by the internal cavity of the reamer draws the loose mud and water mixture into the mud discharge pipe, achieving integrated excavation and transportation. The berth module 2 is linked to the HYPACK software through the DGPS differential positioning system. The land base station receives GPS satellite signals in real time and calculates the coordinate error value. The error correction data is sent to the shipboard terminal through the wireless data transmission system, so that the dredger can accurately display the designed trench edge and real-time auger trajectory on the electronic chart. It is also synchronously connected to the water level telemeter to monitor tide level changes and the auger depth indicator to control the dredging accuracy to ±0.3m. The pipeline transportation module 3 adopts a segmented floating pipe structure. A 6m long steel pipe with an external buoyancy float forms a buoyancy unit. Adjacent steel pipes are flexibly connected by a 1.5m long high-pressure rubber hose. The pipeline is arranged in an S-shaped bend along the direction of the river flow to buffer the impact of the water flow. The pipeline is fixed by a double anchor cross-casting method every 100m. The anchor body uses a 50kg cast iron plow anchor embedded in the riverbed at a depth of 1.5m. The reagent mixing module 4 is equipped with three 8m 3 A vertical dissolving tank is equipped with a double-layer stainless steel paddle stirrer. The polyacrylamide cationic agent is fully dissolved at a concentration of 6% for 60 minutes to form a colloidal solution. The solution is then injected into the Venturi mixer of the DN150 mud conveying pipeline at a volume ratio of 1:5 through a mechanical diaphragm pump. The PC flocculant solution is then added a second time at the end of the pipeline through an independent dosing branch pipe. The tube bag filling module 5 uses a high-toughness polypropylene woven tube bag with an equivalent pore size of 0.5mm. The mud flow rate is controlled to 0.8m during the first filling. 3 / min until the tube bag expands to 70% of the designed height, and after standing and dehydrating for 48 hours, it is refilled to 90% height for the second time, and the filling port is closed after the third filling reaches 100% filling degree; The consolidated anti-seepage yard module 6 adopts a layered anti-seepage structure. The foundation is compacted layer by layer by a roller and then paved with a 1.5mm thick HDPE anti-seepage membrane. The joints are double-welded by hot-melt welding and air-filled for testing. The membrane is covered with 600g / m 2 Non-woven geotextile forms the filter layer, and then 200mm thick 5-20mm graded gravel is laid as the drainage cushion layer. The surrounding annular drainage ditch is spliced ​​with C20 concrete prefabricated U-shaped troughs, and the slope of the ditch bottom is controlled at 3‰ to guide the leachate into the filtrate collection pool.

[0031] Through systematic integration, each module realizes the full process of low-disturbance sludge excavation, directional transportation, synergistic solidification with chemicals and ecological disposal.

[0032] Reference Figure 1 and Figure 2 The low-disturbance reamer module 1 determines the order of anchoring according to the wind flow, first dropping the upwind anchor and the upstream anchor, so that the low-disturbance reamer module 1 is moved to the edge line of one side of the dredging strip, and the low-disturbance reamer module 1 is lowered and lowered to fix the hull. At the same time, after dropping the anchor, the transverse cable is tightened. After confirming that the upwind anchor and the upstream anchor have grasped the mud, the low-disturbance reamer module 1 is lifted out of the mud surface, and the wind flow is used to move the amphibious dredger to the edge line of the other side of the dredging strip for operation.

[0033] Specifically, when the low-disturbance reamer module 1 is implemented, the order of anchoring is dynamically adjusted according to the real-time monitored wind direction and flow velocity vector data, with the main transverse anchor being preferentially dropped on the upwind side and upstream side of the ship's operating surface. The anchor body adopts a plow-type structure to enhance grip; the anchor cable is formed at a 45° angle to the centerline of the hull through the winch system. This angle design is based on the principle of vector balance between the lateral displacement force of the ship caused by wind and waves and the tension force of the anchor cable in fluid mechanics, ensuring the lateral stability of the hull; the anchor cable adopts a high-strength nylon-steel composite cable, and the reamer is lowered synchronously to cut into the riverbed during the tightening process. A temporary fulcrum is formed, and the reaction force of the cutter is used to assist the anchor body in embedding into the mud layer. The anchor grip value is fed back in real time through the anchor cable tension sensor. When the grip reaches the preset threshold, the cutter is lifted out of the mud surface. Subsequently, wind pressure or water flow thrust is used, and the anchor boat assists in traction, so that the hull moves horizontally along an arc trajectory with the positioning pile as the center to the other side of the excavation strip. The anchoring and cutter positioning actions are repeated to form a continuous fan-shaped working surface. This process realizes the coordinated linkage of anchor cable retraction and release, cutter lifting and lowering and power propulsion through the ship's automated control system, reducing manual intervention and lowering energy consumption.

[0034] Reference Figure 1 The slipway module 2 is connected to a land reference station through data. The land reference station obtains the observation value correction number through satellite, so that the observation value of the slipway module 2 can be corrected in real time to obtain the coordinates of the ship position where the slipway is located. At the same time, the slipway is connected to a water level telemeter and a reamer depth indicator to display the excavation depth in real time.

[0035] Specifically, the slipway module 2 realizes high-precision coordinate solution through the DGPS differential positioning principle. Its land base station adopts a fixed station with known precise geodetic coordinates, receives satellite signals in real time and calculates pseudo-range errors, and sends the error correction to the ship-borne receiver through a wireless data transmission radio; the slipway module 2 has a built-in GNSS receiver and is deeply integrated with the HYPACK navigation software. After receiving satellite signals and base station correction numbers in real time, it uses a carrier phase smoothing pseudo-range algorithm to solve the position and output the hull coordinates with a plane positioning accuracy better than ±0.5m; at the same time, it connects to the water level telemeter through the RS485 communication interface to obtain real-time tide data, combines the auger lowering parameters transmitted by the auger depth indicator, and constructs a three-dimensional excavation in the HYPACK software. The mud model dynamically displays the deviation value between the auger trajectory and the designed excavation section, and triggers an audible and visual alarm when the deviation exceeds ±0.3m; during implementation, the operator adjusts the winch retraction and extension speed and the auger pitch angle through the hydraulic control system according to the spatial position relationship between the virtual mark of the trench edge line displayed on the electronic screen and the real-time trajectory line of the auger, so that the auger can accurately cut along the fan-shaped trajectory of the preset 35m strip, and achieve 1-2m overlap between the strips through the step-by-step advancement of the positioning pile trolley. This implementation method uses spatial information fusion technology to intelligently associate the positioning error control amount, equipment motion parameters and navigation interface visualization elements to form a closed-loop control logic, which not only ensures the complete stripping of the hard soil layer, but also avoids the cumulative error problem of traditional mechanical guide rod positioning.

[0036] Reference Figure 1 and Figure 2 The land reference station is connected to the satellite by the known precise coordinates (x0, y0, z0) s ,y s , z s ) Calculate the pseudorange error, the calculation formula is: in, represents the satellite pseudorange observation value measured by the land reference station; represents the true geometric distance between the satellite and the land reference station; Δ ρ The observation value correction number is transmitted to the shipboard module 2 in real time through data transmission. The shipboard module 2 receives the correction number Δ ρ Then coordinate correction is performed, and the calculation formula of the coordinate correction is as follows: Δ x =(A T A) -1 A T L; Among them, ρ ship represents the corrected observation value; represents the original pseudorange observation value received by the berth module 2; represents the true geometric distance between the satellite and the platform module 2; ∈ represents the residual error; Δ x A represents the design matrix composed of the geometric distance and the partial derivative of the coordinates of the slipway module 2; A T L represents the residual vector; (A T A) -1 Indicates the influence of the satellite geometric distribution on the solution accuracy; eliminate the common error Δ by the combination of the above formulas ρ The residual error ∈ is significantly reduced, and the robustness of the coordinate solution is optimized through redundant observations of 4 satellites.

[0037] The pipeline transportation module 3 adopts a 6m steel pipe with a buoy-type floating pipe, and the steel pipes are flexibly connected with a 1.5m long rubber pipe. The floating pipe laying line is streamlined and curved. The steel pipe and the floating pipe are positioned by dropping small anchors in both directions every 100m, and the amphibious dredger sucks up the mud and directly transports it to the mud filling area through the mud discharge pipe.

[0038] Specifically, for the differential global positioning system of the ship platform module 2 described in claim 4, its principle is based on the synchronous observation of the same set of satellite signals by the land base station and the ship platform receiver, and the known precise coordinates (x0, y0, z0) of the base station and the satellite coordinates (x s ,y s , z s ) Calculate pseudorange error Δ ρ , eliminating common errors such as atmospheric delay and satellite clock error. The error is transmitted to the ship station module 2 in real time through the digital radio, and the original observation value ρ ship Make corrections and use the least squares algorithm to solve the coordinate correction amount Δ x , combining redundant observation data from four or more satellites to optimize solution robustness, ultimately enabling real-time display of dredging trajectories and 3D cross-sections using HYPACK software. During implementation, a land-based reference station was installed at a known control point. The berth module 2 integrated a DGPS receiver and data processing unit. During construction, the reference station continuously transmitted corrections, allowing the berth to automatically calculate coordinates. This, coupled with data from the water level telemeter and auger depth sensor, achieved centimeter-level positioning accuracy and dynamic monitoring of dredging depth, ensuring the auger excavated precisely within the pre-set sectors.

[0039] The innovative design of the pipeline transport module 3 is reflected in the use of segmented floating pipe flexible connection and bidirectional anchoring technology: 6m long steel pipes are provided with buoyancy by buoys, and adjacent steel pipes are flexibly connected with 1.5m long rubber pipes, forming a streamlined pipeline layout that can flexibly deform with the water flow. During implementation, flanges are welded at both ends of the steel pipe and clamped to the rubber pipe with high-strength bolts. A steel wire reinforcement layer is set inside the rubber pipe to withstand 1.8m3 The floating pipe system boasts a delivery pressure of 100 / min, and is coated with weather-resistant neoprene to prevent aging. Steel cables connect the system to small bidirectional anchors every 100 meters. The anchors utilize a V-shaped ground-gripping structure embedded in the riverbed. Spring buffers are placed between the anchor cable and the floating pipe to absorb transient tension, keeping the pipeline's swing under current pressure to within 1.5 times its diameter. This ensures continuous mud delivery while avoiding stress concentration in the pipeline caused by rigid connections. This structure utilizes streamlined bends to reduce water resistance, flexible connections to compensate for hull displacement, and bidirectional anchoring to suppress lateral drift, collectively creating a stable mud delivery channel.

[0040] Reference Figure 1 and Figure 2 In the drug mixing module 4, there are 3 integrated dosing devices, and a double-layer agitator is set on the top of each integrated dosing device. After the drug is dissolved, it is transported to the dosing mixing pipeline by a mechanical diaphragm dosing pump and injected into the tube bag laid in advance in the yard.

[0041] Specifically, the drug mixing module 4 uses three vertical cylindrical drug dissolving tanks arranged in parallel, and the effective volume of each drug dissolving tank is 8m 3 The tank body is made of 316L stainless steel to resist chemical corrosion. The double-layer agitator configured on the top of each dissolving tank is composed of an upper three-blade propulsion impeller and a lower frame-type scraping impeller coaxially linked. The propulsion impeller speed is controlled at 60r / min to achieve forced convection mixing during the chemical dissolution process, and the frame impeller rotates at a low speed of 15r / min to eliminate chemical adhesion on the tank wall. After the polyacrylamide cationic agent is quantitatively added through the pneumatic feeding device on the tank top, the axial flow generated by the propulsion impeller quickly sucks the agent particles into the dissolution area, and the frame impeller simultaneously breaks up the agglomeration of the agent; when the PC flocculant dissolves, the frame impeller continuously scrapes the tank wall to prevent the crystallization and deposition of the agent. The dissolved liquid is collected through the conical liquid collection port at the bottom of the tank and then fed to the mechanical diaphragm dosing pump. The dosing pump adopts a three-cylinder parallel structure to eliminate pulsation. A Y-type static mixer is set at the pump outlet to form a 45° inclined injection interface with the mud conveying pipe, which promotes turbulent diffusion mixing of the agent and the mud through the Venturi effect.

[0042] Reference Figure 1 and Figure 2 In the tube bag filling module 5, the tube bag filling is based on the previous field experiments. The sludge from three groups of sampling points is combined and sampled. After being treated with the agent, it is filled into the tube bag to record the dehydration speed, consolidation effect and leachate conditions. At the same time, the moisture content of the sludge after dehydration is detected, and the moisture content is controlled within 75%.

[0043] Specifically, the tube bag filling module 5 adopts an equivalent pore size of 0.5 mm and a permeability of 25 L / m 2 / s, and a CBR bursting strength of 10kN. The equivalent aperture parameter is set based on the particle size distribution characteristics of the silt particles. It can effectively intercept solid particles larger than 0.5mm to prevent the loss of fine materials, and can also ensure the drainage efficiency per unit area through the permeability parameter. The CBR bursting strength index ensures the mechanical strength of the tube bag to withstand the upper load when stacked in multiple layers. During the layered filling operation, the initial filling is to 70%-75% of the tube bag's design height. After 48 hours of natural drainage, a stable mud cake layer is formed. Before the secondary filling, a manual slapping device is used to perform regular mechanical vibration along the surface of the tube bag. By applying an impact pressure of 0.3-0.5MPa, the formation of micro-cracks in the surface mud cake is accelerated, thereby improving the penetration and drainage efficiency of the subsequent filling mud. The third filling adopts intermittent grouting method, pausing for 10 minutes after injecting mud for every 15 minutes, and using the elastic deformation characteristics of the tube bag material to promote the internal stratification and drainage of the mud. During the dehydration process, the distributed optical fiber sensor built into the tube bag monitors the mud consolidation degree in real time. When the drainage rate is monitored to be less than 5L / m for 2 consecutive hours, the mud will be discharged. 2 A single dehydration cycle is completed when the bag reaches a flow rate of 100 mph (1000 mph). A dense, solidified layer of approximately 5-8 cm thick forms on the bag surface. The bags are stacked in a staggered, stepped arrangement, with a 20 cm gap between adjacent bags to ensure adequate space for manual tapping and geogrid anchoring during the subsequent soil covering process.

[0044] During the testing phase, a portable moisture meter is used to sample at one-quarter of the bag's diagonal. Microwave drying is then used to rapidly determine the moisture content, ensuring that after three fillings, the overall moisture gradient is uniform and that the moisture content within the top 20 cm is ≤75%. This implementation achieves both rapid in-situ sludge dehydration and structural stability through the coupling of optimized bag material parameters and the filling process.

[0045] Reference Figure 1 In the consolidation and anti-seepage yard module 6, the construction sequence of the consolidation yard is as follows: A1. Earthwork excavation: Excavate the site according to the design requirements, remove surface vegetation and obstacles, and excavate and transport earthwork according to the designed elevation and slope; A2. Construction of retaining dams: Build retaining dams around the excavation area or at key locations, using earth and stone to compact the dam body in layers. A3. Digging drainage ditches: Dig drainage ditches along the site perimeter or in low-lying areas to collect surface runoff and groundwater and direct them to sedimentation ponds. A4. Site leveling and compaction: Level and compact the excavated base using a roller for layered compaction, replacing weak areas with gravel. A5. Constructing an anti-seepage system layer: laying a 200mm gravel drainage layer on the compacted site, and then laying a HDPE membrane and non-woven geotextile on the gravel drainage layer.

[0046] Specifically, the specific implementation method of the construction sequence A1-A5 in the consolidation and anti-seepage yard module 6 is as follows: A1: During the earthwork excavation stage, a backhoe excavator is used to remove surface vegetation and obstacles according to the design elevation, and the foundation outline is formed along the boundary line of the yard. The excavation slope is sloped at a ratio of 1:1.5 and a 200mm artificial finishing layer is reserved; A2: When building the retaining dam, a layered rolling method is used. The thickness of each layer does not exceed 300mm. The dam body material is a mixture of clay and crushed stone excavated on site. The dam top width is 1.2m and a 3% cross slope is formed towards the side of the ditch. The slope foot is flat. A 300mm thick crushed stone filter layer was set up; A3 drainage ditch was dug with a trapezoidal cross section, a 100mm thick gravel layer was laid at the bottom of the ditch and a DN200 perforated corrugated pipe was buried, and the longitudinal slope was controlled between 0.5% and 1%; A4 site leveling and compaction was carried out using an 18t vibratory roller in three passes, with a compaction degree of more than 93%. Local weak areas were replaced with graded crushed stone with a particle size of ≤50mm to the design elevation; A5 anti-seepage system layer was constructed by first laying a 1.5mm thick HDPE anti-seepage membrane, welded with a double-track hot-melt welder with a seam width of ≥100mm, and then laying 600g / m 2 Non-woven geotextile, and finally paved with 200mm gravel drainage layer in layers to form an anti-seepage and drainage composite structure from bottom to top.

[0047] Reference Figure 1 A construction method for an efficient sludge treatment system based on an amphibious dredger comprises the following steps: S1. Construction preparation: Complete personnel training and equipment access route survey, conduct original mud surface measurement and soil layer analysis according to technical specifications, determine the dredging plan, and level and clean the geotube dewatering site; S2. Preparation of additives: Conduct a tube bag filling test to observe the floc size, degree of breakage, and sedimentation rate of the sludge reaction under the same conditions, and determine the appropriate sludge agent and the amount of sludge agent to be added for formulation; S3. Strip excavation: The amphibious dredger enters the site and positions itself, commencing operations within each construction area. Strip excavation is carried out using the principle of fan-shaped horizontal excavation. Based on the effective horizontal width of the amphibious dredger, the river channel is divided into sections of 35m in length and the width of the river channel along the river flow direction. S4. Pipeline installation and mud transportation: strictly control the swing amplitude of the floating pipe and the smoothness of the line. Drop small anchors every 100m in both directions to position the mud. Suck up the mud and transport it directly to the filling area through the pipeline by the dredger. The established delivery power of the dredger is 1.8m 3 / min; S5. Sludge Pumping: First, prepare a sludge slurry with a relatively high water content. Use an integrated dosing device and pipe injection to add the agent to the sludge slurry delivery pipeline. The dosage is 1.3 kg / TDS. After the agent is dissolved, it is transported to the dosing mixing pipeline by a mechanical diaphragm dosing pump and injected into the tube bags laid out in advance in the storage yard. The tube bags are filled in layers. Each time, the filling is stopped after the tube bag can no longer be filled with sludge. After dehydration for 2 days, the bag is filled again. Each tube bag is filled a total of 3 times. S6. On-site dehydration and curing: During the dehydration process of the tube bag, workers scrub the surface of the tube bag at regular intervals. The generated leachate passes through the gravel layer and the filtrate collection ditch into the filtrate collection tank, and is discharged into the nearby municipal sewage network after sedimentation and testing. S7. On-site backfilling: After a period of sedimentation and drainage, the tube bag forms a solid capsule. When the height of the mud-filled tube bag is stable and no longer changes, the silt in the tube bag is sampled and sent for inspection. After passing the inspection, the soil can be covered and the tube bag can be used to store the soil excavated during the site construction.

[0048] Specifically, the construction method is implemented according to the following steps: First, during the construction preparation stage, specially trained operators adjust the parameters of the amphibious dredger according to the three-dimensional trench model displayed by the HYPACK software, and use the DGPS differential positioning system to establish a dynamic mapping relationship between the hull coordinate system and the engineering coordinate system, wherein the land reference station transmits Δ ρ The pseudorange correction number is sent to the shipborne terminal through the formula Δ x =(A T A) -1 A T L solves the millimeter-level positioning accuracy of the hull; then, during the strip excavation stage, the operator controls the hydraulic winch to implement the strip excavation using the fan-shaped horizontal excavation method. Each strip is divided into 35m widths and maintains a 1-2m overlap. The cutting depth is monitored in real time by the auger depth indicator to ensure that the particle size of the broken stone is less than the diameter of the DN150 mud discharge pipe; during the mud transportation stage, a 6m steel pipe with a buoy and a 1.5m rubber pipe are alternately connected to form a flexible conveying line. Two-way anchor points are set every 100m to resist water impact and maintain a stable mud flow rate of 1.8m 3 / min; During the sludge extraction stage, the focus is on the precise addition of chemicals, through 3 8m 3A 6% concentration of cationic polyacrylamide and a 10% concentration of PC flocculant were simultaneously prepared in a dissolving tank and injected into the turbulent flow section of the main mud pipeline using a mechanical diaphragm pump at a volume ratio of 1:5 and 1:12.5, respectively. The shear force of the fluid was used to achieve full contact between the agents and the silt particles. A three-layered loading strategy was implemented during bag filling, with each filling being stopped when the bag expansion rate reached 90%. The surface filter cake layer was destroyed by manually tapping the outer wall of the bag, accelerating the discharge of leachate into the circular drainage ditch through a 200mm gravel layer. The final backfilling phase employed a layered compaction method to cover 30cm of planting soil, and shallow-rooted shrubs such as Ligustrum lucidum were planted at 1.5m intervals to form an ecological bank slope that combines slope consolidation and landscaping functions. This implementation method achieved mechanized and coordinated operations throughout the entire silt treatment process through the innovative combination of spatial positioning algorithm optimization, fluid dynamics mixing control, and layered consolidation technology.

[0049] Reference Figure 1 In step S1, before construction, an on-site survey of the riverbed silt situation is conducted, and a riverbed silt treatment construction plan is prepared. At the same time, silt and water quality samples are sampled and sent for inspection, and a sludge bag filling yard is constructed according to the construction plan.

[0050] Specifically, when conducting on-site investigation of the silt situation in the river before construction, the grid zoning method was used to divide the dredging area into 10m×10m grid units, and a sampling point was set at the center of each grid unit. The silt flow state index and water content were measured by a handheld silt consistency meter. The thickness of the silt layer and the distribution of hard interlayers were analyzed in combination with the "Engineering Geological Survey Report", and the cutting depth of the amphibious dredger cutter and the width of the fan-shaped cross-excavation method were determined. When formulating the construction plan, the corresponding agent ratio plan was matched according to the silt property classification results. After the silt at the sampling points was merged, a pipe bag filling simulation test was carried out. The siltation coefficient η of the equivalent aperture of the pipe bag during the filling process was simultaneously tested, and the pipe bag filling rate and the frequency of the slapping operation were optimized accordingly. When constructing the mud bag yard, the layered rolling method was used to treat the foundation. First, a 1.5mm HDPE anti-seepage membrane was laid and the seams were hot-melt welded, and then covered with 600g / m 2 Non-woven geotextile forms a composite anti-seepage layer, and the surface is paved with 200mm graded gravel to form a drainage channel. The circular collection ditch around the site leads to the filtrate collection pool with a slope of 0.5%. An online suspended matter monitor is installed in the pool and a valve is linked to the municipal pipeline network to achieve automatic control of leachate discharge to meet the standards.

[0051] The implementation principle of the present embodiment is as follows: an amphibious dredger utilizes the rotation of a cutter mounted on a suction arm to excavate and break ground. The rotating cutter continuously loosens the riverbed silt, which is then mixed with mud and water. The silt is then pumped through the suction port of the suction arm and directly to a treatment site via a DN150 discharge pipe. Experiments are conducted to observe the sludge reaction under the same conditions, determine the appropriate sludge treatment agent and the dosage of the agent to be added. The agent reacts chemically with harmful minerals in the sludge, degrading them. After determining the agent ratio, sludge samples from the sampling points are combined and tested for bag filling. Based on the dehydration and solidification results, the use of high-toughness polypropylene geotextile bags is determined. The leachate is then tested and allowed to be discharged into the municipal pipe network only after it meets discharge regulations. Subsequently, a consolidation yard is constructed, where the bags are placed for dehydration. The seepage wastewater is collected and drained to prevent secondary pollution. A circular drainage ditch is also installed, through which the water filtered from the bags is collected and then enters a filtrate collection tank. To prevent secondary contamination of the surrounding soil by leachate from the silt consolidation bags, the surface of the yard foundation is treated for seepage control. According to the designated construction sequence, a cofferdam is constructed, and diversion and pumping are carried out. Silt enters the bags through a delivery pipe. During this process, chemicals are added to the slurry delivery pipeline through a dosing device, using a pipeline injection method. The chemicals are then injected into the pre-placed bags at the yard for dehydration and consolidation. When the bag height stabilizes and no longer fluctuates, mud samples are collected and sent for inspection. If they meet the requirements and there is no secondary contamination, soil is covered and small shrubs are planted to create an ecological river bank slope.

[0052] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. The efficient silt treatment system based on an amphibious dredger is characterized by: The system comprises a low-disturbance reamer module (1), a slipway module (2), a pipeline transport module (3), a reagent mixing module (4), a tube bag filling module (5) and a consolidation and anti-seepage yard module (6); Low-disturbance reamer module (1): This module consists of a rotary reamer configured at the front end of an amphibious dredger, which is used to cut hard soil layers, rocks and silt to form a mud-water mixture. The reamer uses a fan-shaped horizontal excavation method to perform excavation operations in strips; Slipway module (2): After locating the position through observation values, this module uses HYPACK software to process data through a computer, and displays the outline of the designed dredging section, the designed trench edge, the dredging operation track of the cutter and real-time navigation data; Pipeline transportation module (3): This module consists of a mud discharge pipeline, a steel pipe, a floating pipe and a rubber flexible connecting pipe. The steel pipe and floating pipe are anchored in both directions every 100m. A dosing and mixing node is set in the mud transportation path, and the end point is connected to the mud bag filling yard. Reagent mixing module (4): This module uses an integrated dosing device and a pipeline injection method to add reagents to the sludge slurry conveying pipeline. The reagent is made of a polyacrylamide cation and a PC flocculant. The polyacrylamide cation is dissolved in river water at a concentration of 6‰, and the volume ratio of the solution to the mud is 1:

5. The PC flocculant is dissolved in river water at a concentration of 10%, and the volume ratio of the solution to the mud is 1:12.

5. After the polyacrylamide cation and PC flocculant are dissolved, they are added to the mud, and then the solution is added to the mud treatment tank. Tube bag filling module (5): This module uses high-toughness polypropylene to fill geotechnical tube bags, which are filled in layers three times, dehydrated for two days each time, and the dehydration and solidification conditions are recorded. The surface of the tube bag is regularly tapped to accelerate drainage; Consolidation anti-seepage yard module (6): This module is used to place the pipe bags and collect and drain the seepage sewage. A circular water collection ditch is provided around the yard. The surface layer of the foundation of the yard is treated for anti-seepage, and the water filtered out by the pipe bags is collected through the water collection ditch and then enters the filtrate collection pool.

2. The efficient sludge treatment system based on an amphibious dredger according to claim 1 is characterized in that: The low-disturbance reamer module (1) determines the order of dropping anchors according to the wind flow, first dropping the upwind anchor and the upstream anchor, thereby moving the low-disturbance reamer module (1) to the edge line of one side of the dredging strip, lowering the low-disturbance reamer module (1) to fix the hull, and tightening the transverse cable after dropping the anchor. After confirming that the upwind anchor and the upstream anchor have grasped the mud, the low-disturbance reamer module (1) is lifted out of the mud surface, and the wind flow is used to move the amphibious dredger to the edge line of the other side of the dredging strip for operation.

3. The efficient sludge treatment system based on an amphibious dredger according to claim 1 is characterized in that: The slipway module (2) is connected to a land reference station via data, and the land reference station obtains observation value correction numbers through satellites, so that the observation values ​​of the slipway module (2) are corrected in real time to obtain the coordinates of the ship's position. At the same time, the slipway is connected to a water level telemeter and a reamer depth indicator to display the excavation depth in real time.

4. The efficient sludge treatment system based on an amphibious dredger according to claim 3 is characterized in that: The land reference station is connected to the satellite by the known precise coordinates (x0, y0, z0) s ,y s , z s ) Calculate the pseudorange error, the calculation formula is: in, represents the satellite pseudorange observation value measured by the land reference station; represents the true geometric distance between the satellite and the land reference station; Δ ρ The observation value correction number is transmitted to the ship platform module (2) in real time through data transmission, and the ship platform module (2) receives the correction number Δ ρ Then coordinate correction is performed, and the calculation formula of the coordinate correction is as follows: D x =(A T A) -1 A T L; Among them, ρ ship represents the corrected observation value; represents the original pseudo-range observation value received by the ship platform module (2); represents the true geometric distance between the satellite and the platform module (2); ∈ represents the residual error; Δ x represents the coordinate correction amount; A represents the design matrix composed of the geometric distance and the partial derivative of the coordinates of the slipway module (2); A T L represents the residual vector; (A T A) -1 Indicates the influence of the satellite geometric distribution on the solution accuracy; eliminate the common error Δ by the combination of the above formulas ρ The residual error ∈ is significantly reduced, and the robustness of the coordinate solution is optimized through redundant observations of 4 satellites.

5. The efficient sludge treatment system based on an amphibious dredger according to claim 1 is characterized in that: The pipeline transport module (3) adopts a 6m steel pipe to pass through a buoy-type floating pipe, the steel pipes are flexibly connected with a 1.5m long rubber pipe, the floating pipe laying line is streamlined and curved, the steel pipe and the floating pipe are positioned by dropping small anchors in both directions every 100m, and the amphibious dredger sucks up the mud and directly transports it to the mud filling area through the mud discharge pipe.

6. The efficient sludge treatment system based on an amphibious dredger according to claim 1 is characterized in that: In the drug mixing module (4), three integrated drug-feeding devices are provided, and a double-layer agitator is provided on the top of each integrated drug-feeding device. After the drug is dissolved, it is transported to the drug-feeding mixing pipeline by a mechanical diaphragm drug-feeding pump and injected into the tube bag laid in advance in the yard.

7. The efficient sludge treatment system based on an amphibious dredger according to claim 1 is characterized in that: In the tube bag filling module (5), the tube bag filling is carried out according to the previous field experiment, and the sludge at three sampling points is combined and sampled. After being treated with the agent, it is filled into the tube bag to record the dehydration speed, consolidation effect and leachate situation. At the same time, the water content of the sludge after dehydration is detected, and the water content is controlled within 75%.

8. The efficient sludge treatment system based on an amphibious dredger according to claim 1 is characterized in that: In the consolidation and anti-seepage yard module (6), the construction sequence of the consolidation yard is as follows: A1. Earthwork excavation: Excavate the site according to the design requirements, remove surface vegetation and obstacles, and excavate and transport earthwork according to the designed elevation and slope; A2. Construction of retaining dams: Build retaining dams around the excavation area or at key locations, with the dam body compacted layer by layer using earth and stone; A3. Dig drainage ditches: Dig drainage ditches along the perimeter of the site or in low-lying areas to collect surface runoff and groundwater and guide them to sedimentation tanks; A4. Site leveling and compaction: The excavated base is leveled and compacted using a roller in layers, and local weak areas are replaced with gravel. A5. Constructing an anti-seepage system layer: laying a 200mm gravel drainage layer on the compacted site, and then laying HDPE membrane and non-woven geotextile on the gravel drainage layer.

9. A construction method for an amphibious dredger-based efficient sludge treatment system, applicable to the amphibious dredger-based efficient sludge treatment system according to any one of claims 1 to 8, characterized in that: The construction method comprises the following steps: S1. Construction preparation: Complete personnel training and equipment access route survey, conduct original mud surface measurement and soil layer analysis according to technical specifications, determine the dredging plan, and level and clean the geotube dewatering site; S2. Preparation of additives: Conduct a tube bag filling test to observe the floc size, degree of breakage, and sedimentation rate of the sludge reaction under the same conditions, and determine the appropriate sludge agent and the amount of sludge agent to be added for formulation; S3. Strip excavation: The amphibious dredger enters the site and positions itself, commencing operations within each construction area. Strip excavation is carried out using the principle of fan-shaped horizontal excavation. Based on the effective horizontal width of the amphibious dredger, the river channel is divided into sections of 35m in length and the width of the river channel along the river flow direction. S4. Pipeline installation and mud transportation: strictly control the swing amplitude of the floating pipe and the smoothness of the line. Drop small anchors every 100m in both directions to position the mud. Suck up the mud and transport it directly to the filling area through the pipeline by the dredger. The established delivery power of the dredger is 1.8m 3 / min; S5. Sludge Pumping: First, prepare a sludge slurry with a relatively high water content. Use an integrated dosing device and pipe injection to add the agent to the sludge slurry delivery pipeline. The dosage is 1.3 kg / TDS. After the agent is dissolved, it is transported to the dosing mixing pipeline by a mechanical diaphragm dosing pump and injected into the tube bags laid out in advance in the storage yard. The tube bags are filled in layers. Each time, the filling is stopped after the tube bag can no longer be filled with sludge. After dehydration for 2 days, the bag is filled again. Each tube bag is filled a total of 3 times. S6. On-site dehydration and curing: During the dehydration process of the tube bag, workers scrub the surface of the tube bag at regular intervals. The generated leachate passes through the gravel layer and the filtrate collection ditch into the filtrate collection tank, and is discharged into the nearby municipal sewage network after sedimentation and testing. S7. On-site backfilling: After a period of sedimentation and drainage, the tube bag forms a solid capsule. When the height of the mud-filled tube bag is stable and no longer changes, the silt in the tube bag is sampled and sent for inspection. After passing the inspection, the soil can be covered and the tube bag can be used to store the soil excavated during the site construction.

10. The method for constructing an efficient sludge treatment system based on an amphibious dredger according to claim 9, characterized in that: In step S1, before construction, an on-site survey of the riverbed silt situation is conducted, and a riverbed silt treatment construction plan is prepared. Simultaneously, silt and water quality samples are sampled and sent for inspection, and a sludge bag filling yard is constructed according to the construction plan.

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