2063 results about "Cofferdam" patented technology

Disclosed in the present invention is a construction process of an offshore bridge high-rise pile platform. A cofferdam of a steel-concrete structure is used for construction. The cofferdam consists of a cofferdam bottom plate prefabricated by means of reinforced concrete and a steel side formwork. The construction process comprises the following stages: a preparation stage, a cofferdam mounting stage, a cofferdam lowering stage, a cofferdam bottom plate blocking and water pumping stage, and a platform concrete pouring stage. The preparation stage comprises the following steps: pile foundation casing sinking, cast-in-place pile construction, pile foundation casing pile head trimming, cofferdam bottom plate and skirt plate prefabrication, and steel side formwork manufacturing. The cofferdam mounting stage comprises: first, mounting the cofferdam bottom plate, and then mounting the steel side formwork, wherein the cofferdam bottom plate is mounted by means of suspension hangers, and each suspension hanger comprises a pile cap, an inverted hanging beam, and two first finish-rolled twisted steel bars. The cofferdam lowering stage comprises mounting a jack lowering system on the cofferdam bottom plate, wherein the cofferdam lowering system comprises I-shaped hangers, carrying pole beams, center hole jacks, and steel strands. The construction process of the present invention can greatly reduce the construction difficulty and can improve the construction efficiency.

The invention discloses an intelligent monitoring and early warning method and system for a cofferdam construction process, and belongs to the field of intelligent monitoring, and the early warning method comprises the steps: collecting historical hydrological and geological data, constructing a hydrological-geological database, marking risk factors, and determining hydrological and geological risk types and safety thresholds. Then, key monitoring parameters are determined according to the cofferdam type, unique IDs are distributed to the sensors, and sensor data are integrated to network transmission nodes; and after the data is transmitted to the data processing center, the data is decompressed and compared with hydrological-geological data, and a sensor data weight coefficient is calculated. A cofferdam construction early warning model is constructed based on the data, early warning conditions are screened step by step through weight coefficients and risk factors, and construction early warning evaluation parameters are formed. And finally, risk identification and probability early warning are carried out on the construction process in combination with real-time data, so that the construction safety is improved. According to the method, the accurate cofferdam construction early warning model is constructed, so that the accuracy of construction risk prediction is improved.

The invention discloses a double-row steel sheet pile cofferdam construction method, which comprises the following steps of: before construction, measuring the original riverbed elevation of a cofferdam piling area, organizing steel pipes to enter a site according to a cross-section diagram and a construction sequence of a cofferdam, timely removing and recording if stone blocks and the like at the river bottom are measured in the measurement process, and before construction, checking and maintaining all mechanical equipment, so that the construction efficiency is improved. After entering the field, the steel pipes are stacked according to specifications, varieties and classifications, before pile conveying, the models and the number of the steel pipes used during construction are determined, and the steel pipes are arranged strictly according to the designed section. Compared with a construction scheme of adopting a Larsen steel sheet pile cofferdam and a temporary construction platform, the construction cost, the rental cost, the earthwork transportation cost, the earthwork compaction cost, the earthwork filling excavation filling cost and the like of temporary facilities can be saved, building construction is carried out in a water area needing a large area, the construction period is long, and the construction cost is low. The method is more economical and reasonable when being used for constructing structures in water under the conditions of high water level and the like.

The invention belongs to the technical field of steel cofferdam displacement monitoring, and particularly discloses a deepwater bottom-sealing-free double-wall steel cofferdam construction displacement monitoring system which is characterized in that multi-source displacement monitoring is carried out on a lowered cofferdam section in a test monitoring time period, water level and flow speed monitoring is synchronously carried out, an environment influence monitoring source is identified by means of displacement mutability analysis, and the construction displacement of a deepwater bottom-sealing-free double-wall steel cofferdam is monitored. Therefore, the effective monitoring source is selected to perform accurate displacement monitoring in combination with the monitoring results of the water level and the flow velocity in the subsequent displacement monitoring, the process realizes the effect verification before the implementation of the displacement monitoring, the accuracy of the displacement data is ensured to the greatest extent, and meanwhile, when the displacement monitoring result is used for analysis, the accuracy of the displacement data is improved by identifying the offset monitoring point. The arrangement positions and the deviation directions of the monitoring points are combined, deviation guiding analysis of the lowered steel cofferdam section is carried out, deep utilization of displacement monitoring data is achieved in the process, targeted guidance can be provided for displacement deviation correction, and the deviation correction efficiency and the deviation correction effect can be improved easily.

The invention discloses a double-row steel sheet pile and soil core combined cofferdam structure and a construction method. The double-row steel sheet pile and soil core combined cofferdam structure comprises double-row pile connecting units, steel sheet piles, brackets, steel enclosing purlins, dredger fill and drainage plates. Each double-row pile connecting unit is formed by welding an upper connecting plate between two connecting steel sheet piles; the double-row pile connecting units are inserted into a soil body, and a steel sheet pile is inserted between every two double-row pile connecting units; corbels are welded to the outer sides of the steel sheet piles, steel enclosing purlins are arranged on the corbels, and the steel enclosing purlins, the steel sheet piles and the corbels are connected in a welded mode; dredger fill is filled between the two rows of steel sheet piles and is compacted by a hammer-attached soil squeezer; a drainage plate is inserted into the dredger fill; earth excavation is conducted on the side, close to water, of the double-row pile cofferdam to form a foundation pit; when shallow excavation is conducted on the foundation pit, no sand filling pipe bag is arranged; when the foundation pit is deeply excavated, a slope section is reserved; sand filling pipe bags are arranged on the outer side of the slope section and stacked on the outer side of the slope section in a staggered mode. The hammer-attached soil squeezing device comprises an attached hammer, a pressing plate, water permeable holes, geotechnical cloth and a brush.

The invention provides a power tube heat dissipation structure, a power supply device and a processing and assembling method.The heat dissipation structure comprises a PCB, a power tube attached to the PCB and a radiator corresponding to the heat dissipation face of the power tube, and one face, attached to the heat dissipation face of the power tube, of the radiator is provided with one or more cofferdam structures; a heat conduction interface material is arranged in an area defined by the cofferdam structure, and the heat dissipation face of the power tube is attached to the heat conduction interface material. The heat conduction insulating layer and the radiator are integrated, no extra insulating part needs to be installed, the manufacturing process is simplified, and the production efficiency is improved. And through the cofferdam structure arranged on the radiator, the heat conduction material is limited in the cofferdam, so that the problems of horizontal slippage, vertical flow and the like of the heat conduction material under the influence of temperature change and vibration factors are prevented, and the thermal reliability of the power supply device is improved.

The invention provides equipment and method for repairing a concrete lining plate in a running water state, and the equipment comprises a truss which is arranged in the depth direction of a canal surface, one end of the truss is a water inlet end, the other end of the truss is a water outlet end, the truss is provided with a sliding frame in a sliding manner, and the sliding frame moves back and forth on the truss in the direction of the water outlet end or the direction of the water inlet end; the telescopic unit is provided with a mounting end and a working end, the mounting end is slidably arranged at the bottom end of the truss so as to slide along the width of the truss, and the working end is provided with a rotating part; and the operation module comprises a cutting unit and a dismounting and mounting unit, and the cutting unit and the dismounting and mounting unit are selectively arranged on the rotating part according to the operation content. The combination of the telescopic unit and the rotating part is matched with the cutting unit and the dismounting and mounting unit to sequentially cut, separate, extract and convey the damaged lining plate and mount the new lining plate, divers do not need to enter water for operation, and compared with cofferdam construction, the device can be directly deployed at the position needing to be repaired, so that the preparatory work process is simplified.

The invention relates to the technical field of high-precision positioning in water surface construction, and discloses a Beidou positioning-based cofferdam positioning method for bridge construction, which comprises the following steps: S1, initializing Beidou RTK, setting a base station, acquiring an initial position of a cofferdam, and realizing centimeter-level positioning by using differential correction; s2, fluid-solid coupling modeling is carried out, a dynamic model of the cofferdam under the action of water flow, tide and wind power is established based on a computational fluid mechanics method, and stress and deformation of the cofferdam are calculated in combination with finite element analysis; and S3, estimating an unscented Kalman filtering state, and calculating the current position, speed and error range of the cofferdam based on the historical position information of the cofferdam and fluid-solid coupling modeling prediction data. According to the method, the timeliness of error correction is ensured through an error loop feedback mechanism and a real-time alarm function, the robustness and stability of the system are improved, and the positioning precision and reliability of the cofferdam in the construction process are remarkably improved.

The invention discloses a device and method for monitoring settlement of an earth rock cofferdam, and relates to the technical field of concrete curing, the device comprises a monitoring sensor unit 1, the monitoring sensor unit 1 comprises a settlement sensor for measuring tiny settlement change, an inclination sensor for monitoring whether the cofferdam is inclined in the settlement process, and a data collector, the data collector is connected with the detection sensor unit, the data collector is used for collecting data measured by the settlement sensor and the inclination sensor, and the data collector is further provided with a wireless transmission module used for wirelessly transmitting the collected data to a remote monitoring center; according to the device and method for monitoring settlement of the earth rock cofferdam, monitoring data can be displayed and stored in real time, a report is generated through data analysis and a visual tool, and engineering management personnel can conduct risk assessment and construction progress management conveniently. The decision-making efficiency is improved, and comprehensive control over the safety of the cofferdam is enhanced.

The invention discloses a steel sheet pile cofferdam and underwater pier construction technology suitable for a geological environment near a water area. The steel sheet pile cofferdam and underwater pier construction technology comprises the following steps that the position of a steel sheet pile wall is planned; constructing a guide frame body for assisting in inserting and driving the steel sheet piles corresponding to the position of the steel sheet pile wall; steel sheet piles are sequentially and vertically inserted in the positions, corresponding to the steel sheet pile wall, of the guide frame body in a locking mode, and the steel sheet pile wall is formed; and closing operation is conducted according to the head end and the tail end of the formed steel sheet pile wall. The technical problem that in the prior art, a steel sheet pile cofferdam construction technology is not high in function applicability in the aspects of steel sheet pile inserting and driving quality, a foundation pit excavation and supporting system and construction environment adaptability is solved.

The invention relates to a dynamic grid-based foundation pit temperature field-seepage-stress field coupling calculation method, which comprises the following steps of: establishing a nonlinear dynamic bidirectional coupling constitutive relationship of a temperature field, a seepage field and a stress field containing a two-dimensional foundation pit cofferdam, and obtaining a three-field full coupling equation set; in combination with a GPU acceleration solver, solving the three-field full-coupling equation set by adopting a sub-domain decoupling-asynchronous iteration strategy; and performing real-time early warning on the cofferdam construction period according to a solving result. The method has the advantages that compared with a traditional linear model, the precision of the established three-field full-coupling equation set is improved, and the interaction influence relation of three fields can be well simulated.

The invention relates to the technical field of river bank protection, in particular to a river bank slope protection for cofferdam construction and a construction method thereof. S2, construction of a near-water area structure; s3, construction of a far water area structure; s4, ecological enhancement; triple optimization of river bank protection is achieved through dynamic water level monitoring and modular design, a double-layer reinforced concrete and elastic sealant structure is adopted in a near-water area, the compressive strength is improved by 20%, the crack width is smaller than or equal to 0.2 mm, and material waste is reduced by 15% in cooperation with dynamic width adjustment (+ / -2 m); the mold bag concrete slope protection is combined with an atomization spraying system, the anti-scouring capacity reaches 5 m / (m.s), the vegetation coverage rate is larger than or equal to 80% within 3 months, and the water and soil loss rate is reduced by 70%; the modular honeycomb structure inflation assembly efficiency is improved by 40%, the transportation cost is reduced by 50%, the distributed sensors achieve structure displacement / pressure three-level early warning, the operation and maintenance cost is reduced by 70%, the overall service life is prolonged by more than 5 years, and an ecological-engineering collaborative protection system is formed.

The utility model relates to a full water tank culvert relocation and relocation butt joint box culvert and a construction method thereof. The full water tank culvert relocation and relocation butt joint box culvert comprises a U-shaped steel sleeve box, a row hole, a ring beam, a new box culvert, an old box culvert and an inspection shaft. The construction method for changing the full water tank culvert into the butt joint box culvert comprises the steps that firstly, the height of a ring beam on a top plate of an old box culvert is increased synchronously, and the ring beam is connected with old box culvert embedded steel bars; 2, a new box culvert is constructed according to design requirements. The butt-joint box culvert has the advantages that the butt-joint box culvert adopts the U-shaped steel sleeve box to block water flow of the box culvert, the cyclic repeated utilization rate is high, the steel plate rigidity is large, the stability of a weir body is guaranteed, the construction period is shortened, and the cost is saved; the U-shaped steel sleeve box is used as a temporary cofferdam in the box culvert and can be quickly mounted and dismounted, and the safety risks of box culvert silt accumulation caused by manual stacking of sandbag cofferdams and underwater manual dismounting are avoided.

The utility model relates to a steel cofferdam structure for deepwater foundation auxiliary construction. The method is suitable for the technical field of cofferdams. According to the technical scheme, the cofferdam comprises a plurality of corner connecting units and cofferdam wall bodies arranged between every two adjacent corner connecting units. The cofferdam wall body comprises at least one cofferdam unit, and the cofferdam unit is formed by splicing a plurality of hollow steel plates; a first limiting column is arranged on the right side face of the hollow steel plate, a first limiting clamping groove capable of being matched with the first limiting column is formed in the left side face of the hollow steel plate, and a sealing air bag matched with a gap between the first limiting clamping groove and the first limiting column is arranged in the first limiting clamping groove. The top of the hollow steel plate is provided with a top sealing structure, and the bottom of the hollow steel plate is provided with a bottom sealing structure matched with the top sealing structure to achieve sealing. At least one connecting seat is fixed on the inner side surface of the hollow steel plate; a supporting and fixing mechanism is arranged in the steel cofferdam structure and fixedly connected with the connecting bases of the hollow steel plates on the steel cofferdam structure.

The invention relates to the technical field of underwater engineering, and discloses a steel pipe pile cofferdam and a cofferdam construction method.The steel pipe pile cofferdam comprises a plurality of steel pipe columns, the two sides of each steel pipe column are each provided with a first lock catch and a second lock catch which extend in the length direction of the steel pipe column, and steel pipe piles are buckled in pairs through the corresponding first lock catches and second lock catches; a sealing cavity is formed between the first lock catch and the second lock catch, and the sealing cavity is sequentially divided into a sealing cavity, an induction cavity and a grouting cavity from the outer side to the inner side of the cofferdam; the sealing cavity and the sensing cavity are separated through the elastic water stop lips, and shape memory alloy wires are arranged in the elastic water stop lips. The cofferdam has the beneficial effects that the first layer of sealing structure is formed by arranging the mechanical seal, then the second layer of sealing structure and the third layer of sealing structure are formed by the elastic water stop lip and the grouting area, and water located on the outer side of the cofferdam is prevented from entering the inner side of the cofferdam step by step through the three layers of sealing.

The present invention relates to a double-walled steel cofferdam with no bottom and a construction method for deep-water rock capping platform rotary excavation. The BIM three-dimensional simulation technology is used to accurately design the size of the cofferdam module and the position of the preset holes, which greatly improves the accuracy and efficiency of the construction. By solving the problems of module size and layout in the design stage, the installation and commissioning work on site can be significantly reduced, thereby speeding up the construction progress and ensuring the quality of the project. The quick connection method of prestressed tendons and extruded waterproof strips is adopted between the cofferdam modules, which saves a lot of welding work, not only improves the construction efficiency but also reduces the construction difficulty. The guide device used for the lowering of the cofferdam is used for horizontal and vertical displacement and inclination monitoring, which can help the cofferdam lowering process more accurately, and greatly improve the construction efficiency and safety. The comprehensive slotting method of impact drill, rotary drilling drill and grab bucket greatly improves the slotting efficiency and reduces the slotting difficulty.

The invention discloses a cofferdam device for hydraulic engineering construction and an operation method thereof.The device comprises a cofferdam, buffering mechanisms arranged on the periphery of the exterior of the cofferdam, reinforcing mechanisms arranged on the periphery of the exterior of the cofferdam and driving control mechanisms arranged at the four corners of the cofferdam, and the cofferdam is composed of supporting columns and steel plates and forms a rectangular frame structure; the reinforcing mechanism is connected with a first fixing block and a second fixing block through a reinforcing rod to enhance the stability of the cofferdam, the driving control mechanism is composed of a forward and reverse motor, a sliding groove, a threaded rod and a sliding block and can automatically adjust the position of the buffering mechanism according to the change of the water level, and the buffering mechanism comprises a supporting rod, an arc-shaped first elastic plate, an arc-shaped second elastic plate and a first damper. Impact energy is absorbed through elastic deformation and damping force, and the cofferdam is protected against impact of water flow and floating objects. The position of the buffer mechanism can be automatically adjusted according to the water level condition, and it is ensured that the buffer mechanism is located at the optimal working position all the time so as to meet the buffer requirements under different water level conditions.

The invention provides a cofferdam anti-seepage monitoring method for tidal zone bearing platform construction. According to the method, real-time monitoring and early warning of the cofferdam state are achieved. Firstly, an acquisition module acquires high-definition image data of the surface of the cofferdam, cofferdam water pressure and tide data, and time stamps are ensured to be synchronous; then, using computer vision and a deep learning algorithm to identify crack, attitude deviation and deformation conditions in the image; predicting future water pressure change by using a deep learning model in combination with the tide data and the water pressure data; and when the detection result exceeds a preset threshold value, an early warning mechanism is triggered immediately. In addition, all data are stored in a database, and model parameters are updated regularly to improve accuracy. According to the method, multi-source data are fused, possible factors of cofferdam penetration are detected by adopting a computer vision technology and a deep learning technology, and the cofferdam anti-seepage monitoring accuracy and the dynamic prediction capability are remarkably improved.

The invention relates to the technical field of water conservancy control, and discloses a water conservancy project cofferdam gate control system based on a PLC, and the system comprises a hydraulic drive and detection assembly and a controller. A discrete state observation module, a disturbance characteristic identification module, a virtual axis parameter scheduling module and a control law synthesis module are configured in the controller. The discrete state observation module reconstructs a system state and estimates total disturbance; the disturbance characteristic identification module judges normal, jamming or turbulent working conditions according to the disturbance characteristics; the virtual axis parameter scheduling module adjusts the virtual stiffness and the damping coefficient in real time according to the working condition, or executes an asymmetric auxiliary escape strategy; the control law synthesis module combines state feedback and feed-forward compensation to generate a control voltage. Through multi-modal parameter scheduling, water flow impact and non-linear friction interference are effectively overcome, decoupling under the turbulent working condition and flexible protection and auxiliary escape under the jamming working condition are achieved, and the synchronization precision and safety of gate control are improved.

The invention relates to the technical field of water conservancy project cofferdam construction, and discloses a cofferdam backfill supporting device which comprises a filler pipeline, a guide part is arranged on the filler pipeline, a positioning groove is formed in the outer wall of the filler pipeline, a supporting part is arranged on the filler pipeline, and the supporting part comprises a first supporting ring and a second supporting ring. The first supporting ring is slidably connected with the outer wall of the filling pipeline, a support is fixedly connected between the first supporting ring and the second supporting ring, a positioning part is arranged on the support and comprises a rod sleeve, and the rod sleeve is fixedly connected to the support. The guiding part and the supporting part are matched to avoid inclination and deviation of the pipeline, the positioning part and the calibration part are matched to improve the hole site calibration precision, the limiting part achieves conflict-free switching between the calibration part and backfill material injection, finally it is guaranteed that backfill materials are evenly filled, the problems of scattering and cavities do not exist, and the requirements for cofferdam impermeability and structural stability are met.

The present invention relates to the field of digital twin technology, and in particular to a method and system for intelligent monitoring of bridge steel cofferdam construction based on digital twin. The method comprises the following steps: obtaining bridge steel cofferdam construction data; creating a full-element digital twin model according to the bridge steel cofferdam construction data to obtain a bridge steel cofferdam digital twin model; obtaining real-time bridge steel cofferdam data, and performing fusion mapping according to the real-time bridge steel cofferdam data and the bridge steel cofferdam digital twin model to obtain a bridge steel cofferdam dynamic model; performing real-time monitoring according to the bridge steel cofferdam dynamic model to obtain bridge steel cofferdam construction monitoring data, and performing dynamic risk assessment according to the bridge steel cofferdam construction monitoring data to obtain bridge steel cofferdam construction risk data, so as to perform intelligent monitoring operations for bridge steel cofferdam construction. The present invention continuously updates the digital twin scene through massive scenes and monitoring data, and realizes visualization, intelligent monitoring and early warning of the entire process of bridge steel cofferdam construction.

The invention relates to the technical field of water conservancy projects, in particular to a cofferdam for ship lock transformation and a construction method. A cofferdam for ship lock transformation comprises concrete cofferdam bodies and hollow concrete supporting structures, the concrete cofferdam bodies are tightly attached to the wall faces on the two sides of a ship lock and extend in the water flow direction, and the hollow concrete supporting structures are arranged between every two adjacent concrete cofferdam bodies. The hollow concrete supporting structure is fixedly connected with the concrete cofferdam body through a connecting device, the hollow concrete supporting structure comprises a bottom layer, a hollow layer and a top layer, a plurality of rows of cavities arranged side by side are formed in the hollow layer, and blasting devices are pre-buried in the concrete wall between every two adjacent cavities at equal intervals. The concrete cofferdam body is tightly attached to the wall face of the ship lock, a stable water retaining barrier can be formed, the self weight can be reduced through the design of the hollow layer, and compared with traditional mechanical or manual dismantling, efficient and controllable dismantling can be achieved through the blasting device embedded in the supporting structure, and the construction period can be greatly shortened.

The invention relates to the technical field of water conservancy projects, in particular to an anti-seepage control system for an earth rock cofferdam. The method comprises the following steps: periodically acquiring external hydro meteorological data and internal structure response data of a cofferdam through a sensor group based on a monitoring unit; establishing a multi-field coupling model based on a finite element method through a model building unit, and dynamically coupling a wave load, a tidal water level and an osmotic pressure field; the minimum cofferdam crest elevation is determined by comparing the difference between the minimum safety coefficient and a preset safety coefficient on the basis of a decision-making unit; and based on the analysis unit, inputting the minimum cofferdam crest elevation into the multi-field coupling model to obtain the maximum value of the hydraulic gradient of the escape point of the downstream slope within a third preset time period, determining an anti-seepage state based on the maximum value, and adjusting related parameters based on the anti-seepage state. The seepage risk of the cofferdam is monitored, predicted and actively controlled in real time, so that the seepage rate of the earth rock cofferdam is reduced.

The invention discloses a steel casing cofferdam anchoring operation method for a deepwater hard rock area, and belongs to the technical field of overwater construction platforms, a cofferdam, a steel casing and a drilling platform are included, before the cofferdam is lowered, bed rock cleaning is completed through layered excavation and impact treatment, a karst cave is filled with an underwater concrete ball pulling method, and the stability of a foundation is improved. When the steel casing and the drilling platform pipe pile are installed, the bottom adjusting device is used for adjusting the angle, ensuring the perpendicularity, shortening the construction period and reducing the labor cost and the safety risk. The pipe piles are fixedly connected with the cofferdam through a connecting system. According to the method, the bed rock is treated, the impact resistance and disturbance resistance can be improved, the service life of the platform is prolonged, and reliable support is provided for bridge construction. Accurate positioning and layered excavation are achieved, disturbance to rock stratums and karst caves is reduced, the influence on the ecological environment is reduced, and meanwhile the construction quality and efficiency are guaranteed.

The invention provides a dynamic risk assessment method and device for a steel cofferdam construction period based on digital twinning. The method comprises the steps that actual values of all monitoring points corresponding to all evaluation indexes in an initial state and a current state are collected by applying a real-time dynamic monitoring and collecting system based on a constructed dynamic risk assessment index system; a steel cofferdam digital twinborn model is combined with finite element calculation to obtain theoretical values of all monitoring points in the initial state and the current state; calculating an actual change value and a theoretical change value of each monitoring point; according to the actual change value and the theoretical change value, the alarm value of each evaluation index and the predicted stress of the component under the most unfavorable working condition are determined, risk assessment is conducted, and the actual value of any evaluation index is the sum of the actual value of the corresponding monitoring point in the current state and the theoretical value of the corresponding monitoring point in the initial state. A digital twin system is combined with field measured data to accurately evaluate the current risk level, so that the structural rigidity is adjusted in time or water return in the weir is carried out in advance, and the structural safety is ensured.

The bank protection cofferdam structure comprises a first pile row and a second pile row which are arranged in parallel, the first pile row and the second pile row are driven in soil, the upper end of the first pile row and the upper end of the second pile row are connected through an opposite-pulling mechanism, a first bamboo raft sheet layer and an anti-seepage geomembrane are arranged on the inner side of the first pile row, and a second bamboo raft sheet layer and an anti-seepage geomembrane are arranged on the inner side of the second pile row. A second bamboo raft piece layer and geotechnical cloth are arranged on the inner side of the second pile row, backfill soil is arranged between the first pile row and the second pile row, and bagged soil is evenly laid on the top of the backfill soil. The anti-seepage performance and the stability of the revetment cofferdam structure can be improved.

The invention discloses an irrigation channel maintenance cofferdam system and a maintenance method, the system comprises a vehicle body with an arm, a rotating device, a cofferdam device and a sealing structure, a cantilever is hinged to the tail end of a working arm of the vehicle body with the arm, the rotating device is mounted at the lower end of the cantilever, and the cofferdam device is mounted at the lower end of the rotating device; the cofferdam device comprises a first baffle and second baffles, the two second baffles are installed at the left end and the right end of the first baffle correspondingly, an included angle is formed between each second baffle and the first baffle, and sealing structures are installed on the lower sides of the first baffle and the second baffles and the sides, away from the first baffle, of the second baffles correspondingly. A connecting base is installed on the upper side of the first baffle and connected with the rotating device. When the cofferdam device is installed, the cofferdam device is fixed through the working arm of the truck body with the arm, and the cofferdam device is more convenient to install.

The utility model discloses a concrete cofferdam and steel sheet pile cofferdam combined cofferdam structure, and belongs to the technical field of bridge construction. Comprising a concrete prefabricated bottom plate and a steel sheet pile cofferdam, a surrounding edge is poured on the top face of the concrete prefabricated bottom plate, a plurality of through holes are formed in the positions, on the inner side of the surrounding edge, of the concrete prefabricated bottom plate, and protruding parts are integrally poured on the positions, outside the through holes, of the top face of the concrete prefabricated bottom plate; reinforcing ribs are integrally poured between the adjacent protruding parts of the concrete prefabricated bottom plate, and the protruding parts on the sides and the inner edge of the surrounding edge are integrally poured. A plurality of embedded parts are arranged on the periphery of the concrete prefabricated bottom plate; according to the combined cofferdam structure of the concrete cofferdam and the steel sheet pile cofferdam, the concrete prefabricated bottom plate and the steel sheet pile cofferdam are firstly assembled on the water surface and then are hoisted to enter the water bottom, the underwater pouring amount is small, and construction is easy and convenient.

The invention belongs to the technical field of crossing of artificial intelligence and computational mechanics, and particularly relates to an artificial intelligence-based MPM simulation method and system for a mold bag sand cofferdam, a three-dimensional simulation system of the mold bag sand cofferdam is constructed in combination with an MPM method, and the penetration state of sand and geotechnical cloth is detected in an accelerated manner by utilizing a penetration tracking algorithm and spatial Hash. An artificial intelligence algorithm is introduced, a reward function is designed with minimum penetration depth and penetration times as targets, penetration prediction of MPM particles is driven, the speed and stress of the MPM particles are further dynamically regulated and controlled on the basis of a predicted contact model and the artificial intelligence algorithm, penetration is prevented, numerical stability is ensured, and the prediction accuracy of the MPM particles is improved. The calculation precision is improved by adopting implicit integration and gradient descent methods; and bidirectional coupling of the sand and the geotechnical cloth is realized through a visualization module. The problems that in a traditional method, coupling simulation of sandy soil and a flexible structure is low in efficiency, easy to penetrate, unstable in numerical value and the like are solved, and the accuracy and reliability of simulation analysis of the mold bag sand cofferdam structure under the complex working condition are remarkably improved.

The invention discloses an installation method of a novel double-row steel sheet pile cofferdam structure, which comprises the following steps of: installing I-shaped steel at the center of a set position of two rows of Larsen steel sheet pile groups, and respectively fixing two ends of the I-shaped steel in a pair of river levees; an outer Larsen steel sheet pile group is tightly installed on the side, away from water flow, of I-shaped steel, meanwhile, a plurality of first pile groups are arranged in an inner cavity of the side, away from the I-shaped steel, of the outer Larsen steel sheet pile group at intervals, and the bottom ends of the first pile groups are inserted into a foundation to be used for supporting the outer Larsen steel sheet pile group. An inner Larsen steel sheet pile group is installed on the side, close to water flow, of the I-shaped steel in an abutting mode, meanwhile, a plurality of second pile groups are arranged in an inner cavity of the Larsen steel sheet pile group between the inner Larsen steel sheet pile group and the I-shaped steel at intervals, and the bottom ends of the second pile groups are inserted into the foundation to be used for supporting the inner Larsen steel sheet pile group. The cofferdam structure installed through the installation method has good water flow impact resistance, anti-seepage performance and supporting stability.