496 results about "River bed" patented technology

Disclosed in the present invention is a bridge scour curved surface morphological feature reconstruction method based on three-dimensional sonar point clouds, comprising the following steps: collecting point cloud data of a three-dimensional morphology of an underwater riverbed terrain near a bridge foundation, and acquiring original point cloud data of a complete morphology of an underwater riverbed; performing denoising and ball pivoting reconstruction preprocessing on the collected original point cloud data to complete preliminary reconstruction of point clouds; on the basis of the point cloud data having undergone preliminary reconstruction, performing point cloud binarization-based scour morphology recognition on the basis of a computer vision principle, calculating scour pit element classification values of all the point clouds, and recognizing scour pit point clouds; on the basis of the recognized scour pit point clouds, using a K-means clustering algorithm for clustering, and calculating the maximum depth of each pier scour pit; and on the basis of the obtained scour pit element classification values of all the point clouds, providing a curved surface reconstruction method based on scour recognition to perform high-precision curved surface reconstruction on the scour pits. The present invention can achieve high-precision scour pit morphology reconstruction.

The invention discloses a river sediment scouring and silting simulation method, and belongs to the technical field of hydraulic engineering and hydrological simulation. In order to solve the problem that it is difficult to accurately simulate the river sediment erosion and deposition evolution trend in the prior art, the method comprises the steps that on the basis of actually measured topographic data and channel chart data of a target river reach, a water-sediment coupling mathematical model is constructed by adopting a non-uniform sediment unbalance sediment transportation theory, and the model interacts with a water power module and a wave module in real time through an MCT coupler; actually measuring a flood and water and sediment series data calibration verification model; and obtaining future water and sediment process data predicted by a plurality of climate modes, inputting the future water and sediment process data into the verified model, dividing river reaches according to the characteristics such as riverbed gradient and river channel curvature, and calculating the erosion and deposition amount of each sub-river reach in the future 50 years. The method can simulate water flow and sediment movement of rivers, reservoirs and lakes, can be applied to the fields of riverway regulation planning, flood control and disaster reduction decision making, reasonable development and utilization of water resources and the like, and provides important data support and scientific basis for construction and management of water conservancy projects.

The invention discloses a channel flow velocity measurement error compensation method based on multi-source fusion, and the method comprises the following steps: S1, synchronously collecting flow velocity, position, attitude and environment data, including ADCP radial flow velocity, GNSS position / speed and IMU attitude angular velocity, through a multi-source sensor, aligning multi-source data based on a time synchronization mechanism, and achieving microsecond time synchronization based on PPS time service; according to the method, RTK high-precision positioning and ADCP bottom tracking data are integrated, the water surface elevation and the water bottom distance are inversed in real time, and the actual water depth and the riverbed erosion and deposition rate are dynamically calculated; edge calculation, motion compensation and external compass correction technologies are fused, the flow velocity and flow direction measurement precision is improved, and platform motion and attitude interference is eliminated; multi-source data local fusion processing and real-time generation of a flow velocity thermodynamic diagram and a water level change curve are realized, remote transmission and visualization are supported, and comprehensive and accurate hydrological data support is provided for maritime affair intelligent supervision, navigation safety early warning and digital channel construction.

The invention relates to the technical field of river flow regulation and control, and discloses a river flow self-adaptive regulation and control system which comprises a hydrological parameter acquisition module, a water flow characteristic analysis module, a section stability analysis module, a multi-source fusion judgment module, a regulation and control parameter generation module and an additional riverbed coupling analysis and dynamic feedback execution module. The hydrological parameter acquisition module acquires parameters to judge a flow unbalance risk and triggers subsequent analysis; the water flow characteristic analysis module extracts turbulence parameters to evaluate water flow uniformity; the section stability analysis module extracts morphological parameters to predict the erosion and deposition trend; the multi-source fusion judgment module fuses the data to generate a regulation and control signal; the regulation and control parameter generation module generates regulation and control parameters according to the matching strategy; a riverbed coupling analysis module monitors a main stream and riverbed coordination correction fusion index; and the dynamic feedback execution module adjusts the acquisition period and feeds back to form a closed loop. The system realizes the real-time monitoring, risk assessment and self-adaptive regulation and control of the river flow, and improves the scientificity and accuracy of regulation and control.

The invention relates to the technical field of water pollution diffusion prediction, and particularly provides a sewage pollution diffusion prediction method and system, and the method comprises the steps: obtaining river bed topographic feature information, real-time hydrological data and sewage discharge information of a river basin; the river basin is divided into a plurality of river reaches according to the river bed topographic feature information, and then local hydrodynamic parameters corresponding to the river reaches are obtained according to the river bed topographic feature information and the real-time hydrological data; for each river reach, acquiring sediment dynamic characteristics according to the river bed topographic feature information and the local hydrodynamic parameters, and then determining sediment adsorption parameters and sediment release parameters according to the sediment dynamic characteristics; according to the sediment adsorption parameters, the sediment release parameters, the real-time hydrological data and the sewage discharge information, pollution diffusion prediction is carried out to obtain a diffusion prediction result; the method can effectively solve the problem of inaccurate prediction caused by the fact that sediment adsorption parameters and sediment release parameters cannot dynamically reflect hydrological condition changes.

The invention relates to the technical field of bridge pier scour monitoring, discloses an air-water-shore cooperative overwater float type bridge pier scour monitoring system, and belongs to the technical field of bridge safety monitoring. According to the system, an integrated framework is formed by a buoy platform, a shore-based cooperative monitoring station and a cloud monitoring platform. The buoy platform is fixed to a pier through a mooring lead, the underwater sonar module of the buoy platform can scan the terrain of a riverbed at multiple angles, and the overwater module integrates high-precision positioning and video monitoring. The shore-based station is provided with a laser scanner and a high-definition camera to monitor the overwater structure and the macroscopic environment of the pier. The cloud platform serves as a control center, converges the multi-source data of the buoys and the shore stations through a communication network, carries out time sequence correlation and fusion analysis, and dynamically evaluates the scour pit development and the bridge pier structure state. According to the invention, the limitation of a single monitoring mode is broken through, collaborative acquisition and intelligent fusion of air, water and shore data are realized, the comprehensiveness, accuracy and early warning capability of monitoring are remarkably improved, and reliable guarantee is provided for safe operation of bridges.

The invention provides a river sediment physical habitat evolution identification method, device and system and a medium. The method comprises the following steps: acquiring a multi-temporal remote sensing image and hydrological data (flow Q, water level Zw and slope S), screening and other hydrological condition image pairs; extracting a water surface range, and calculating the average width B of the main groove; deducing the average water depth h by using a Manning formula, and calculating the riverbed elevation zbed by combining the Zw; the difference value delta zbed of zbed in different periods is calculated, and the substrate state is judged according to the difference value delta zbed and a threshold value epsilon; and performing segment processing along the center line to output a spatial distribution result. On-site measurement is not needed by relying on conventional data, and consumption is reduced; water level interference is eliminated through equal hydrological condition matching, and comparability is ensured; water depth inversion and differential analysis directly reflect scour deposition and quantitatively reveal rules; long-distance automatic processing improves space-time coverage capability and precision, and provides a basis for river regulation, ecological restoration and drainage basin management.

The invention discloses a hydro-junction ecological flow regulation and control system based on digital twinning, and relates to the technical field of intelligent ecological regulation and control. The system obtains digital elevation data DEM, geometric contour images and coupling power data of a riverbed and a wetland through multi-beam sonar, unmanned aerial vehicle remote sensing and a sensor group; and synchronization and preprocessing are realized in the twinborn simulation model to form a flow evolution data set and a water-sediment power data set. And constructing a dynamic connectivity driving force index Dcl based on the flow evolution data set to carry out flow driving force evaluation, constructing a comprehensive connectivity judgment index Eco to carry out ecological connectivity evaluation under the condition of sufficient driving force, and executing a corresponding regulation and control instruction according to an evaluation result. And dynamic adjustment of hub ex-warehouse flow and long-term maintenance of wetland ecological connectivity are realized. According to the system, real-time monitoring, evaluation and regulation of digital twin driving can be realized under a complex water and sediment power condition, and the guarantee capability of a hydro-junction to a wetland ecosystem is improved.

The invention relates to the technical field of river flow monitoring, and discloses a river flow control method and system based on image measurement. The method comprises the following steps: setting a space calibration point through a range finder, establishing a coordinate system, collecting a river image and carrying out geometric correction, calculating a water surface flow velocity by using an optical flow algorithm, calculating a sectional area by combining a water level and riverbed data, calculating an instantaneous flow rate after converting the surface flow rate into a vertical average flow rate, and generating control information according to an ecological flow rate condition. And controlling the opening degree of the water gate, the angle of the guide plate and the submerged adjusting dam according to the control information. According to the method, continuous and accurate measurement and calculation of the monitored section flow are realized based on an image acquisition means, a control mechanism linked with an ecological water demand threshold value is established, and the measurement process is ensured to be completed under a non-contact and remote control condition, so that the method is used for automation, intellectualization and ecological adaptability of water flow control of a dam.

The invention discloses a river water flow measuring device, and relates to the technical field of river water flow measurement, the river water flow measuring device comprises a measuring support frame, the measuring support frame is provided with a folding assembly and a pushing assembly, the folding assembly is provided with a moving assembly and a carrying plate, and the pushing assembly is used for pushing the carrying plate to move towards a riverbed. The measuring support frame is provided with a take-up assembly, the take-up assembly is provided with a measuring device used for measuring river water flow, the moving assembly can drive the take-up assembly to move transversely, and one-key switching from a transportation state to a measuring state is achieved by arranging a foldable folding assembly and an automatic unfolding mechanism. After the controller sends out an instruction, the pushing assembly drives the sliding frame to automatically rotate and unfold, the carrying plate synchronously stretches out and stably makes contact with a riverbed, the whole unfolding process can be completed without manual intervention, the deployment efficiency and operation convenience of the equipment are remarkably improved, and the rapid laying requirements under various topographic conditions are met.

The invention discloses a self-adaptive three-dimensional flow field reconstruction method, device and system for open channel flow and a medium, and relates to the technical field of open channel flow measurement. The method comprises the following steps: acquiring multi-modal data, and preprocessing the multi-modal data; and performing preliminary three-dimensional flow field prediction on the preprocessed data through a lightweight prediction model, and performing consistency verification and anomaly detection by an anomaly detection module. And when the abnormal event is detected, packaging the multi-modal measurement data in the occurrence time window of the abnormal event and uploading the packaged multi-modal measurement data to a cloud server. And only the metering result and the equipment state data are uploaded under the condition of no abnormal working condition. And the cloud server receives the uploaded data packet, performs three-dimensional flow field reconstruction on the data through a physical prior guide large model, and obtains virtual sensor data of the failed sensor and a three-dimensional uncertainty field. And according to the reconstructed complete three-dimensional flow field, in combination with the real-time water level and the latest riverbed topography, performing numerical integration on the flow cross section to obtain a cross section flow value.

Disclosed herein is a hand-held underwater dredge integrated with a metal detector, designed for locating and retrieving metallic objects from aquatic environments. Equipped with a suction-generating electric pump and powered by an onboard battery to enable operation while fully submerged, the dredge features a pipe system leading to a catch can that captures metal items while expelling the water drawn into the pipe system by the generated suction. In operation, users scan a riverbed, seabed, or lakebed using the metal detector. Once a metal item is detected, the user places the suction end of the pipe system over the metal item and activates the electric pump to start the suction, leading to capture of the metal item in the catch can for retrieval. This streamlines the process of underwater treasure hunting, combining detection and collection into a single user-operated system.

The invention relates to the technical field of riverway desilting, in particular to a riverway self-adaptive desilting system and method based on intelligent water level perception, and the method is executed by a central control unit and comprises the four steps of model construction and benchmark calibration, real-time monitoring and siltation diagnosis, precise survey and operation planning and closed-loop execution and model synchronization. The system comprises a central control unit, a water level intelligent sensing array, terrain scanning equipment and dredging machinery, according to the method, the three-dimensional digital riverbed model is constructed, the sedimentation state is dynamically judged in combination with the water level sensing data, an accurate desilting operation scheme is generated, and operation closed-loop control is achieved. According to the method, navigation and ecological riverway dredging requirements are considered, the dredging precision and automation level are improved, the operation cost is reduced, intelligent transformation of riverway management is promoted, and an efficient solution is provided for long-acting treatment of the riverway.

The invention relates to the technical field of sediment prediction, in particular to a method for predicting sediment deposition in a channel based on a hydrodynamic model. Comprising the following steps: correcting the critical start-up flow velocity of the sediment according to the biomass, metabolic rate and biological membrane thickness of a microbial community to obtain a corrected critical start-up flow velocity; on the basis of the corrected critical starting flow velocity, the actual suspended sediment concentration in the navigation channel is calculated in combination with the turbulence intensity, the propagation distance and the ship draught depth of ship wake flow; according to the suspended sediment concentration, the sediment deposition amount in the channel is calculated by combining the cementation strength, the water content and the organic matter decomposition rate of the sediment on the surface layer of the riverbed. According to the method, ecological and navigation related influence factors can be comprehensively considered, and the prediction accuracy in a complex scene is improved.

The invention discloses a karst area surface water and underground water exchange capacity inversion method based on a temperature tracing method. The method comprises the following steps: collecting temperature time sequence data of different horizontal positions and different riverbed depths of karst area surface water / river water and riverbed profiles; the method comprises the following steps: directly utilizing observed surface water temperature data as boundary conditions of a temperature tracing model, and constructing a new two-dimensional heat transfer mathematical model for describing a temperature tracing process of a karst area to be measured; and exporting an analytical solution of the constructed mathematical model by adopting a Green function method, and coupling a particle swarm optimization algorithm, so that the limitation that a traditional temperature tracing model can only invert the vertical exchange capacity is broken, and automatic inversion of the two-dimensional surface water and underground water exchange capacity of the karst area is realized. A new technical means is provided for research on interaction of surface water and underground water in the karst area and water circulation in the karst area, and the method can be widely applied to the fields of numerical simulation of a karst underground water system, water resource evaluation, ecological environment research and the like.

The river channel desilting device comprises a ship body, the ship body is hinged to a suction dredger capable of adjusting the water entry angle, a controller is further arranged in the ship body, the ship body is fixedly connected with a filter box, a filter screen is arranged on the side face of the filter box, a water tank for receiving filtered water is arranged below the filter box, and the water tank is connected with the controller. Pressure-bearing rods are symmetrically fixed to the side faces of the water tank, the ship body is fixedly connected with a supporting plate, the pressure-bearing rods are slidably connected with the supporting plate, the pressure-bearing rods are provided with switch assemblies matched with the supporting plate, the supporting plate is rotationally connected with a rotating wheel, and the rotating wheel is provided with a magnet; the magnet can be matched with the switch assembly to enable the water tank to move downwards, the ship body is provided with a speed adjusting part, the speed adjusting part can adjust the moving speed of the ship body according to the downward moving distance of the water tank, the device can be adjusted in time according to the actual condition that the suction dredger cleans riverbed sludge, and the use safety of the device is improved.

The present invention belongs to the technical field of flood control dams, and discloses a flood control dam for water conservancy projects, comprising a bottom plate, a dam body disposed on the top of the bottom plate near the downstream, two limiting guardrails disposed on the front and rear sides of the dam body on the top of the bottom plate, positioning strips disposed on the backs of the two limiting guardrails, and the positioning strips are inserted into the banks of the riverbed. In the present invention, since the buffer dam needs to continuously overcome friction and other resistances when sliding to gradually approach the bottom plate, it can reduce the impact intensity of flood waves, thereby reducing the direct impact intensity on the dam body. When the damping dam is flipped and the slider is lifted, the resistance to the movement of the buffer dam can be further increased, thereby further improving the effect of reducing the impact intensity. At the same time, due to the lifting of the lifting slider, floating foreign objects that are lifted by the waves and washed over the buffer dam can be received and pushed, so that they slide to the top of the dam body under the action of the inclined surface of the lifting slider for easy recovery.

The application discloses a method for predicting the flow velocity along the course of a river with floating vegetation, and the river with floating vegetation is divided along the water flow direction of the river according to the flow regulation distance, and the water flow direction velocity prediction model of the river with floating vegetation is constructed to realize the prediction of the flow velocity along the course of the river, so as to provide a theoretical basis for further research on the water flow, sediment movement characteristics and riverbed evolution of the natural river and lake with floating vegetation.

Embodiments of the present application disclose a river bed load transport characteristic determination method and device, electronic equipment and a computer readable medium, relating to the field of engineering technology. The method performs fast Fourier transform on the sound pressure signals of the microphone array to obtain a sound pressure matrix in the frequency domain; based on the sound pressure matrix, cross-spectrum operation is performed to obtain a cross-spectrum matrix; based on each scanning grid point j on the surface of the monitoring sensor plate as an imaginary sound source point, a sound propagation model is selected according to the aerodynamics theory to determine the sound signal monitored by any microphone; each grid point is scanned, the auto-spectrum of the simulated sound signal is calculated, and the sound source holographic image of the bed load shock wave is determined; the sound source intensity is simulated, the bed load spatial position is obtained, and the bed load particle size component information is obtained through the calibration function relationship. That is, in the present application, the bed load spatial position and the bed load particle size component information are obtained, this method can accurately determine the transport characteristics of the bed load, and becomes an important support for quantifying the disaster prevention and reduction work of mountainous rivers.

This product is a formwork block used when manufacturing riverbed protection blocks to be installed on the riverbed, and is particularly used in areas adjacent to the slope of the revetment. As shown in the reference perspective view illustrating each part, reference diagram 1 (plan view) illustrating each part, reference diagram 2 (front view) illustrating each part, and reference diagram 3 (plan view) illustrating each part, at the block installation site on the riverbed, this product is erected at two corner positions in a square shape in plan view, on the slope side of the revetment, so that the tapered portion of this product is in contact with the slope. At the other two locations, formwork blocks as shown in the reference perspective view illustrating standard type formwork blocks are erected, and adjacent formwork blocks are connected with formwork plates to form a square-shaped structure in plan view, and concrete is poured into this structure to manufacture the riverbed protection block. As shown in the reference diagram illustrating the state in which revetment blocks are installed on the riverbed, riverbed improvement work is carried out by installing a revetment-type revetment block using this product on the riverbed so that one end is in contact with the slope of the revetment, and another standard-type revetment block is installed in contact with the other end of the revetment-type revetment block, thereby laying down multiple revetment blocks.

The present invention relates to the field of automated data collection technology, and in particular to a Beidou navigation-based automatic riverbed quality data collection control system and method. The method comprises the following steps: acquiring a Beidou satellite multidimensional data set; preprocessing the raw data of the Beidou satellite multidimensional data set to obtain a Beidou multidimensional standard data set; fusing multi-source data based on the Beidou multidimensional standard data set to obtain riverbed multi-source fused data; and generating riverbed sampling decisions using the riverbed multi-source fused data. Therefore, the present invention solves the problems of incomplete data, unreasonable sampling paths, and inefficient report generation in traditional riverbed data sampling processes through the comprehensive application of multi-source data fusion, path optimization, and automated data evaluation, thereby improving the accuracy, efficiency, and intelligence level of riverbed data collection.

The utility model discloses a deep tail water channel structure arranged in a downstream river channel of a hydropower station workshop, which comprises a tail water channel arranged in the river channel, the longitudinal slope of the tail water channel is slowed down to the longitudinal slope of the river channel, and the channel bottom elevation of the starting end of the tail water channel is 5-30 meters lower than the riverbed elevation. The height difference between the surface of the tail water channel bottom plate and the surface of the riverbed is gradually reduced, and the tail water channel bottom elevation is consistent with the riverbed elevation when reaching the tail end of the tail water channel. According to the deep tail water channel structure arranged in the downstream river channel of the hydropower station workshop, it is guaranteed that power generation water heads are increased, and it can be guaranteed that tail water is smoothly discharged into the river channel.

The utility model relates to the technical field of bridge pile foundation local scouring observation instruments, in particular to a bridge pile foundation local scouring observation instrument which is convenient to use and comprises a riverbed pile foundation and a bridge body, a stainless steel rigid slidable ruler is arranged in the middle of the riverbed pile foundation, and a stainless steel gravity type ruler pendant is arranged at the bottom of the stainless steel rigid slidable ruler. A top rod is arranged at the top end of the stainless steel rigid slidable scale, a pressure sensor is arranged at the bottom of the top rod, and an audible and visual alarm is arranged at the top of the riverbed pile foundation.

The invention relates to the technical field of hydraulic engineering image processing, in particular to a hydraulic engineering digital twinning detection device combined with geological data, which comprises a positioning plate, a servo motor and a reinforcing unit are fixedly arranged on the positioning plate, and the reinforcing unit comprises a threaded rod rotationally arranged on the positioning plate. The threaded rod is in threaded connection with a sliding block, a supporting plate is fixedly arranged on the peripheral face of the sliding block, and through a servo motor and the threaded rod which are arranged on the positioning plate, when the device needs to be placed in a riverbed shoal area, a worker can drive the two sliding blocks to move oppositely at the same time by adjusting rotation of the threaded rod; the moving sliding block can drive the other sliding blocks to unfold through the connecting plate, so that the distribution range of each sliding block is expanded, at the moment, the positioning column is inserted into the soil through the sliding block, the stability of the fixing unit can be effectively improved, and image data surveyed by the surveying device body is more accurate.

To provide revetment blocks which can be easily connected to each other, and which can firmly protect a river bed, a sea bottom, a slope, a coast, a river bank, etc.SOLUTION: Three branch parts 21-22 which are radially arranged, rod-shaped, and made of concrete, and which are fixed to an 2b of a branch end of each of the branch parts 21-22 and arranged in a direction orthogonal to an axial direction of each of the branch parts 21-22; In the revetment block 1A, the axial centers of the leg parts 3 are all arranged in the same direction, and the axial center position of one (branch part 21) of the three branch parts 21-22 in the axial center direction of the leg part 3 is different from the axial center positions of the other two branch parts 22 by the thickness of the branch parts 21-22.SELECTED DRAWING: Figure 1

The invention discloses an embankment gushing risk evaluation method based on an embankment gushing formation mode, and the method comprises the steps: constructing the formation mode of the embankment gushing risk through employing the outboard flood occurrence probability as a triggering premise, employing a riverbed instability coefficient as a disaster-causing factor, and employing the stability degree of an embankment as a resistance capability; according to the calculation method for obtaining the embankment gushing risk according to the evaluation model, the embankment gushing risk can be quantitatively analyzed and calculated, the embankment gushing risk point can be effectively recognized, the weak river reach of the embankment can be defended in a targeted mode, passive water safety incident handling is changed into active water safety risk prevention and control, and the method is the key for guaranteeing the flood control safety of the river channel. And the method is universal for safety protection of other river dikes in the world, and has popularization significance.

The invention relates to the technical field of tunnel monitoring, and discloses an underwater tunnel structure health monitoring multi-source fusion and quality enhancement system and method, and the system comprises a sensing layer which is used for collecting the multi-source physical state information of a tunnel structure, and comprises the following subsystems: a structure stress state monitoring subsystem which employs a fiber bragg grating concrete strain gauge, the device is arranged at the maximum bending moment position of a tunnel roof and a longitudinal construction joint of a side wall to monitor concrete strain in real time. According to the system, a full-dimensional monitoring network covering tunnel structure stress, deformation joint multi-dimensional deformation, water leakage, differential settlement, internal water accumulation and overlying riverbed scouring and silting is constructed through cooperative arrangement of point type sensors and distributed sensing optical cables, accurate monitoring of key point positions is achieved, large-range continuous monitoring is achieved, and the monitoring precision is improved. The problem that traditional monitoring only focuses on a single dimension and has a monitoring blind area is thoroughly solved.

The invention relates to the technical field of measurement, and discloses a mountain river bed load motion attitude and sediment transport flux monitoring method and system, and the system comprises a data collection module which is used for obtaining the triaxial angular velocity data, the triaxial acceleration data and the triaxial magnetometer data of a bed load; the motion attitude extraction module is used for correcting the three-axis angular velocity data by using the three-axis acceleration data and the three-axis magnetometer data, extracting a real-time quaternion based on the corrected three-axis angular velocity data, calculating an attitude angle through the real-time quaternion, calculating accumulated displacement of a bed load based on the three-axis acceleration data, and calculating the motion attitude of the bed load according to the accumulated displacement. Using the accumulated displacement and the attitude angle to represent the motion attitude of the bed load; and the sediment transport flux calculation module is used for calculating the total sediment transport amount of the river channel. According to the method, the motion state of the bed load can be prevented from being interfered when the bed load is sampled, so that more accurate data can be acquired, and the acquisition efficiency of workers is improved.

The utility model discloses a pile foundation scouring comprehensive protection structure which comprises a steel pipe pile and a scouring pit around a pile foundation of the steel pipe pile, and further comprises a three-maintenance ring which is fixed to a riverbed, used for limiting water flow around the pile foundation in a protection ring cavity, located on the outer side of the steel pipe pile and spaced from the steel pipe pile by a certain distance. The rear end of the three-maintenance ring is provided with an opening used for guiding water flow in a cavity of the retainer to flow out, the outer wall of the three-maintenance ring is two sections of S-shaped curved surfaces which are in smooth transition and are not equal in wall thickness, the upper curved surface is a curved surface protruding towards the outer side, and the lower curved surface is a curved surface recessed towards the inner side. Erosion of horseshoe vortexes to a riverbed is reduced, and therefore the pile foundation scouring depth is greatly reduced.