437 results about "Submarine pipeline" patented technology

The invention discloses a submarine scoured pipeline stability early warning method based on artificial intelligence, and relates to the technical field of submarine pipeline protection, and the method comprises the steps: collecting and sorting submarine pipeline historical reconnaissance data and monitoring data of a target region; and constructing a seabed-submarine pipeline local fine three-dimensional hydrodynamic-sediment numerical model on the basis of a solution Navier-Stokes equation and a sediment transportation model. According to the method, the historical reconnaissance data, the monitoring data and the numerical model result are integrated, the coupling effect of various factors can be comprehensively considered, then the dynamic characteristics of seabed scouring are more comprehensively captured, key scouring factors influencing the stability of the pipeline are more accurately recognized, and meanwhile, the scouring process and result simulated by the numerical model are combined, so that the stability of the pipeline is improved. According to the method, the stress distribution and deformation conditions of the pipeline under different scour depths can be analyzed more accurately, then an early warning signal is sent out in advance, the risk that the pipeline is damaged due to scour is effectively reduced, and the reliability and accuracy of early warning are improved.

The invention discloses a submarine pipeline state early warning method and system based on scour-vibration coupling sensing, and the method comprises the steps: obtaining the historical marine environment information of a target submarine pipeline region, laying a monitoring sensor array according to the historical marine environment information, collecting multi-source monitoring data, and carrying out the preprocessing of the multi-source monitoring data, thereby forming a multi-source monitoring data set. And constructing a multi-physical field coupling analysis model, inputting the data set into the model to analyze the response condition of the pipeline in the current seabed environment, and obtaining pipeline response simulation information. And analyzing resonance influence caused by environmental scouring in different sections, generating resonance derivative characteristics, and constructing pipeline multi-modal fusion characteristics in combination with monitoring data. Predicting the future response state of the pipeline through the submarine pipeline state analysis model, and carrying out risk early warning prompt; meanwhile, the fatigue life of each section is analyzed based on resonance derivative characteristics, fatigue-prone sections are identified, and maintenance suggestions are generated and pushed. Therefore, the accuracy and timeliness of sensing the state of the submarine pipeline are improved, and the early warning intelligence of the submarine pipeline is effectively improved.

The invention relates to the technical field of ocean exploration, in particular to a non-buried submarine pipeline identification method and system based on multi-beam point clouds, and the method comprises the steps: obtaining three-dimensional point cloud data of a submarine pipeline region, and carrying out the preprocessing of the obtained point cloud data; performing neighborhood construction based on the preprocessed point cloud data, setting a mask attention mechanism according to a neighborhood structure, performing geometric coding and feature enhancement by using an output result of the mask attention mechanism, performing decoding operation on the enhanced features, recovering feature representation of the complete point cloud, and performing suspended span height calculation and verification based on a segmentation result. According to the method, a decoding strategy combining reverse distance weighted interpolation and jump connection is adopted, enhanced features are accurately propagated to the original point cloud, the seabed datum plane is fitted through the reverse distance weighted interpolation, and the high-risk suspended cross area can be rapidly positioned.

The invention discloses a drilling-grouting integrated underwater robot and aims to meet the requirement for precise operation in a complex underwater environment. The robot integrates the fin antenna, the hydraulic telescopic crawler belt, the hydrodynamic force wings, the bionic mechanical arm and the integrated drilling and injecting system, and has the multi-terrain adaptation, efficient navigation and autonomous operation capacity; through modular design and a high-strength pressure-resistant structure, the robot can complete tasks such as pipeline repair, resource exploration and infrastructure construction in a deep sea high-pressure environment; the core technology comprises a multi-mode propulsion system, intelligent sensing and navigation, AI optimization operation and dual-mode operation switching. Typical application scenes include submarine pipeline damage repair, deep sea mining area reinforcement sampling, cross-sea bridge pile foundation grouting and the like. The limitation that a traditional underwater robot is single in function and high in energy consumption is broken through, and the safety and efficiency of complex underwater engineering are remarkably improved.

The invention relates to a large-scale offshore engineering geologic model modeling system and method, and relates to the technical field of offshore engineering geologic investigation and modeling. According to the method, through the steps of multi-source data acquisition, preprocessing, fusion, three-dimensional geological modeling, model optimization, dynamic updating, visual analysis and the like, large-scale geological survey data can be efficiently processed, a high-precision three-dimensional geological model is generated, and dynamic updating and visual analysis are supported. The method has the advantages of high efficiency, high precision, real-time performance, engineering applicability and the like, and is suitable for geological modeling and geological condition analysis of engineering such as offshore wind power, submarine pipelines, ocean platforms and the like.

The invention discloses a submarine pipeline scour-vibration response analysis method based on a cross-scale coupling framework. The method comprises the following steps: establishing a multi-physics field coupling model according to geographical and structural information of a pipeline layout area and initializing the multi-physics field coupling model; marine environment data are obtained through real-time monitoring, the model is imported for scouring dynamic deduction, and a scouring boundary data set is generated. And reconstructing a multi-physics field solving environment, and forming a real-time physics solving environment package. After the model is updated, pipeline vibration response is analyzed, and a vibration data set is obtained. And performing fatigue damage analysis, deducing a flow guide field disturbance coefficient, updating the model again, performing next time step coupling calculation, and finally obtaining a full-period coupling analysis data set. And evaluating the pipeline operation safety situation based on the data set, and generating and pushing a safety report. Various physical field effects on the submarine pipeline in the marine environment are comprehensively considered, the safety of the submarine pipeline is evaluated more comprehensively, and cross-scale coupling analysis between the scouring effect and the vibration effect is achieved.

The utility model relates to a submarine pipeline cleaning device which comprises an impurity removal scraper, a guiding and positioning device, a circumferential rotation flushing device, a pipe wall cleaning device and an advancing driving device. The guiding and positioning device is used for fixing the front end of the submarine pipeline cleaning device and guiding the submarine pipeline cleaning device to advance, the circumferential rotating flushing device flushes the pipe wall, and the pipe wall cleaning device conducts final cleaning on the pipe wall. The advancing driving device is arranged at the rear end of the submarine pipeline cleaning device and provides power for driving the submarine pipeline cleaning device to advance. The subsea pipeline wall cleaning device has the effect of improving the subsea pipeline wall cleaning efficiency.

The invention relates to a method and system for determining the water content of a safe shutdown boundary of a submarine mixed transportation pipeline, and the method comprises the steps: carrying out a physical property parameter test, and taking the physical property parameter as a multiphase flow simulation input parameter; carrying out submarine pipeline shutdown simulation on the basis of the physical property parameter test data, and obtaining oil section temperatures and spatial distribution characteristics at different water depth positions in the pipeline; carrying out an oil-water layering characteristic experiment under a temperature control condition to obtain an oil-water emulsion layering characteristic; sampling oil sections with different layer heights in the oil-water layering characteristic experiment, and testing the water content and simulating the yield / slip characteristic at the oil section temperature based on the temperature distribution of the oil sections; according to the yield / slip stress of the oil sections with different layer heights, carrying out segmented calculation and weighted accumulation to obtain an overall starting stress; on the basis of the overall starting stress, the safe shutdown boundary moisture content is determined in combination with pressure boundary conditions. The method can effectively guide the safe transportation stopping and restarting of the submarine pipeline, optimizes the replacement operation after the transportation stopping of the submarine pipeline, and improves the operation safety and economy.

The present application relates to a kind of large thickness submarine pipeline steel plate and its production method, by the optimization design steel plate component of low-carbon low-alloy component, production method is with the special controlled rolling process of five-stage heating+recrystallization zone low temperature large reduction rolling+intermediate billet instant cooling+non-recrystallization zone high temperature large reduction rolling, and the multi-stage controlled cooling process of high temperature zone air cooling redistribution+ferrite zone cooling+waiting temperature+bainite zone cooling+air cooling self tempering cooling.The product steel plate of the present application has higher acicular ferrite proportion, and the average grain size of ferrite is finer, 3~6 μm, so that the steel plate has good strength and toughness match, the steel plate has higher strength, yield strength ≥500MPa, tensile strength ≥630MPa, and impact energy KV2 At-60 ℃, ≥250J.

The invention relates to the technical field of ocean engineering safety monitoring, in particular to a submarine pipeline soil liquefaction slippage real-time monitoring system based on a sensor network, which comprises a sensor network deployment module, a dynamic baseline analysis module, a multi-source data space-time calibration module, a coupling risk assessment module and a grading early warning module. Wherein the sensor network deployment module is used for collecting multi-parameter data; the dynamic baseline analysis module is used for calculating the dynamic baseline range of each parameter; the multi-source data space-time calibration module is used for eliminating space-time deviation between sensor nodes and outputting space-time calibration data; the coupling risk assessment module is used for calculating a soil liquefaction slippage risk coefficient; and the grading early warning module is used for triggering early warning. According to the invention, through combination of multi-parameter perception, space-time calibration and risk fusion assessment, precise monitoring and graded early warning of submarine pipeline soil liquefaction slippage are realized, and monitoring continuity and early warning timeliness are improved.

The utility model relates to the field of ocean engineering, in particular to an underwater hauling device for a submarine pipeline, which comprises a plurality of buoys and a plurality of counterweights, the buoys are arranged at intervals along the length direction of the pipeline, the counterweights are arranged at intervals along the length direction of the pipeline, the buoys lift the pipeline, the counterweights pull down the pipeline, and the pipelines are arranged at intervals along the length direction of the pipeline. The conduit is configured to be suspended in water. According to the underwater hauling device for the submarine pipeline, the pipeline is suspended in water by arranging the buoy and the counter weight, so that the pipeline can be hauled away from the bottom between a floating hauling method and a bottom hauling method, the pipeline is not in direct contact with the seabed and is not influenced by the seabed, and therefore only small hauling force is needed, and the pipeline can be hauled away from the bottom. And the pipeline can be prevented from being affected by surface wind wave flow like a floating dragging method, and the device is simple in structure, convenient to use and good in effect.

The invention discloses a technical scheme of a submarine pipeline health assessment method and system based on multi-state quantity data fusion, and the method comprises the steps: improving the defect classification precision while reducing the dimensionality through dynamic balance global variance retention and local discrimination enhancement; and a solution with high efficiency and robustness is provided for feature fusion and accurate evaluation of the multi-source high-dimensional pipeline data. The submarine pipeline health assessment method comprises the following steps: collecting monitoring data of a sensor in a submarine pipeline, the monitoring data including but not limited to stress strain, acceleration, vibration and temperature in the submarine pipeline; carrying out fusion and dimension reduction processing on the obtained multi-source heterogeneous data, and finding out a mutual relation of changes among parameters of the submarine pipeline in the same time period; calculating a pipeline damage condition coefficient and a repair index according to an analysis result of the multi-source heterogeneous data; and dividing repair grades according to the repair indexes, comprehensively judging the health state of the submarine pipeline, and giving a repair suggestion.

The invention provides a multifunctional experimental device and method for simulating a corrosion state in a submarine pipeline, and belongs to the field of pipeline corrosion internal detection. The experimental device comprises an experimental device body, a heating device and a circulating pump, a medium in the experimental device body can be externally heated through the circulating pump, and in other words, the circulating pump can continuously convey the medium heated by the heating device to the experimental device body. The test method comprises a corrosion coupon experiment, a corrosion probe experiment and a double-layer pipe annulus corrosion simulation experiment. When a corrosion coupon experiment and a corrosion probe experiment are carried out, a corrosion probe and a corrosion coupon are respectively inserted into the experiment device main body, and corrosion rate data are continuously monitored and detected for 7 days; when a double-layer pipe annulus corrosion simulation experiment is carried out, wireless wall thickness detectors are sequentially attached to the three clamping grooves, and the average corrosion rate of the wireless wall thickness detectors is based on thickness measurement data of the wireless wall thickness detectors. According to the invention, a plurality of corrosion rate simulation parallel experiments can be simultaneously carried out, the operation is simple, the safety is high, and the controllability is high.

The invention relates to the field of submarine pipeline connecting devices, in particular to a step-by-step type submarine pipeline connector which comprises a lower flange and a middle flange, a sealing assembly is arranged in an inner hole of the lower flange, a slip is arranged in an inner hole of the middle flange, the middle flange is in threaded connection with an adjusting screw, and the adjusting screw is provided with a pressing sleeve pressed on the sealing assembly. The adjusting screw is used for driving the pressing sleeve to push the sealing assembly to seal the pipeline, the middle flange is connected with an upper flange through a stud, the stud penetrates through the upper flange, the end, penetrating through the upper flange, of the stud is in threaded connection with a compression nut, a slip bowl is arranged at the end of the upper flange, and the compression nut is used for driving the slip bowl to push the slip to tightly hold the pipeline. Through the arrangement of the adjusting screw, the upper flange and the adjusting screw are used for controlling pipeline holding and pipeline sealing respectively, so that the pipeline sealing process and the pipeline holding process are mutually independent and do not influence each other, and the situation that the pipeline repairing effect is reduced due to the fact that leakage is likely to occur after pipeline repairing caused by unified control of the two processes is reduced.

The invention provides a submarine pipeline health monitoring method, device and equipment based on multi-data fusion, and belongs to the technical field of pipeline monitoring. The method comprises the steps that a physical feature sequence and a light intensity space-time image collected by a multi-source sensor system in the application process of the submarine pipeline are obtained, and the physical feature sequence is used for representing overall vibration information of the submarine pipeline and strain information at multiple different positions; the light intensity space-time image is used for representing intensity change information of optical fibers arranged on the outer side wall of the submarine pipeline; and performing fusion prediction analysis on the physical feature sequence and the light intensity space-time image by adopting a health monitoring model introducing a dynamic channel attention mechanism to obtain a risk fault prediction result of the submarine pipeline. According to the invention, fusion prediction analysis can be carried out on the multi-modal data generated when the submarine pipeline is applied through a deep learning technology, so that health monitoring of the submarine pipeline is realized more comprehensively and accurately.

The invention discloses a rotary flange underwater sealing butt joint method for a deepwater large-diameter composite pipeline, and belongs to the technical field of submarine pipeline engineering. According to the method, aiming at the problems that a traditional flange joint is insufficient in sealing reliability in a deepwater dynamic environment and lacks a long-term monitoring means, a pressure self-adaptive sealing cavity is formed in a rotating flange disc surface, internal pressure is utilized to enhance sealing specific pressure, and a pressure sensor is integrated to monitor a sealing state in real time; and meanwhile, a pressure sensor interface is reserved to realize long-term data acquisition. The device is mainly used for installation, operation and maintenance of submarine water and oil gas pipelines, and long-term sealing safety of pipeline connectors can be effectively guaranteed.

The invention provides a ship and ocean engineering structure corrosion fatigue crack propagation rate prediction method based on machine learning. The method comprises the following steps: S1, obtaining all characteristic variables; s2, screening core influence factors from all feature variables through a feature selection algorithm to obtain feature data; s3, establishing a machine learning prediction model which adopts one of a plurality of machine learning algorithms, and inputting the feature data into the machine learning prediction model to learn a nonlinear mapping relationship between corrosion fatigue crack growth rate data and the selected variables, optimizing the machine learning prediction model by using a hyper-parameter optimization method to obtain a trained model; and S4, inputting feature data of a to-be-predicted target into the trained model for prediction to obtain the corrosion fatigue crack growth rate of the to-be-predicted target. The method is suitable for service safety analysis and life evaluation of key facilities such as ships, ocean platforms and submarine pipelines.

The invention relates to the technical field of ocean engineering equipment, in particular to a submarine pipeline groove angle self-adaption grinding operation method which comprises the steps that a pipeline is fixed through a clamping mechanism, the groove angle is detected in real time through a laser scanning device, and the target inclination angle of a transverse rod is calculated; an adjusting hydraulic cylinder is controlled to enable the axis of a transverse rod to be matched with a target angle, and a servo motor is started to adjust the distance between polishing rods to be matched with the groove width; the sliding seat and the transverse rod are driven to enable the grinding sleeve to be dynamically attached to the groove, and the grinding pressure is monitored in real time and subjected to closed-loop feedback adjustment; and after single-circle grinding is completed, the compensation angle is automatically adjusted according to the surface roughness for accurate grinding. The device has the advantages of high-precision groove forming, dynamic stability control, deep sea environment high adaptability, comprehensive efficiency breakthrough and the like, the groove angle consistency is high, the surface roughness is low, constant grinding pressure can be maintained, the tool wear rate is reduced, parameters can be automatically matched, the tool service life can be pre-warned, and the device adapts to deep sea high-pressure current; and the operation period can be shortened, and resource consumption is reduced.

The invention discloses a submarine pipeline laying device, and belongs to the technical field of submarine pipeline laying, the submarine pipeline laying device comprises a sand box, a mixed fluid pressurization conveying assembly and a vibration transmission assembly, the bottom of the sand box is provided with a slag outlet pipe, the outer surface of the slag outlet pipe is connected with a slag slurry pump, a pipeline is installed in a submarine groove, and the upper surface of the pipeline is movably connected with a pipe bag; through mutual cooperation of the water reducing agent tank, the water reducing agent pipe, the flow meter, the flocculant tank, the flocculant pipe and the water pump II, a water reducing agent and a flocculant can be accurately conveyed into the sand box, the flowability of the water reducing agent and the flocculant is ensured, and a mixture of seawater, coarse sand, the flocculant and the water reducing agent can be pumped into the pipe bag through the slurry pump; the flowing and impact of the liquid can drive the tube bag to vibrate, and then drive the vibration rod, the vibration piece, the vibration ball and the non-Newtonian fluid balls in the hole grooves to vibrate, so that the vibration of the tube bag is accelerated, the mixture is prevented from caking, and all corners of the tube bag are uniformly filled with the mixture.

This invention provides a method for designing a submarine structure based on the biomimetic characteristics of the peregrine falcon's hydrodynamics. The submarine structure retains the traditional internal structure of a submarine pipeline, but the outermost concrete counterweight layer (5) is modified from its circular shape to a streamlined design that mimics the peregrine falcon's body shape. This streamlined design features a smooth exterior contour and a surface covered with honeycomb-like holes, free of large undulations and sharp corners, effectively reducing fluid resistance. The submarine structure comprises, radially from the inside out, a steel pipe (1), an anti-corrosion insulation layer (2), a thermal insulation layer (3), a casing (4), a concrete protective layer (5), and a honeycomb structure (6). Through the technical solutions of this invention, this method optimizes the hydrodynamic performance of the submarine structure, significantly reducing the impact of hydrodynamic impact loads on the structure. It also demonstrates comprehensive protection against environmental loads such as submarine landslides, undercurrent scour, and sand wave migration. This method has broad application prospects and is suitable for a variety of marine engineering structures.

The invention relates to the field of submarine pipeline repairing devices, in particular to a split type submarine pipeline connector which comprises a supporting assembly, the supporting assembly is arranged in a containing hole in a penetrating mode, a mechanical flange is connected with a flange plate through a stud, the stud is in threaded connection with a pressing nut, and the pressing nut is pressed on the flange plate. The flange plate is pressed on the supporting assembly, the pressing nut is used for driving the supporting assembly to push the sealing assembly to move to a gap between the sealing pipeline and the containing hole, the flange plate is in threaded connection with an adjusting screw, an upper pressing sleeve is arranged at the end of the adjusting screw, and a slip is arranged on the inner side of the upper pressing sleeve. The upper pressing sleeve and the slip slide relatively, the adjusting screw is used for pressing the upper pressing sleeve to push the slip to hold the pipeline, through the structure, the pipeline sealing process and the pipeline holding process are independent of each other and do not affect each other, and the situation that due to the fact that the two processes are controlled in a unified mode, leakage is prone to occurring after the pipeline is repaired is reduced; and the repairing effect on the pipeline is reduced.

The invention provides a submarine pipeline corrosion rate prediction method, system and device and a medium, and the method comprises the steps: obtaining monitoring data along a target submarine pipeline and pipeline body data; constructing a microbial corrosion random kinetic model based on the monitoring data, and simulating and generating a random microbial corrosion current component; calculating a pipe wall temperature field which is non-uniformly distributed along the axial direction of the pipeline based on the monitoring data and the pipeline body data; calculating an electrochemical corrosion current component based on the pipe wall temperature field and the electrochemical parameters of the pipeline material; performing multi-physics field coupling calculation on the random microbial corrosion current component and the electrochemical corrosion current component to generate a corrosion space-time distribution field; and performing corrosion risk analysis based on the corrosion space-time distribution field to obtain a corrosion risk prediction result. The method can improve the corrosion prediction accuracy of the submarine pipeline.

The invention discloses a submarine pipeline surface cleaning and additive repairing integrated device and method. The device comprises a drainage cover, a holding device, a cleaning device, a power device and a rack. The drainage cover is arranged on the rack, and the cleaning device is arranged below the rack. The upper half portion of the rack is arranged in the circumferential direction of the holding device, and the lower half portion of the rack is arranged on the holding device. The power devices are symmetrically arranged on the upper side of the rack. Circumferential cleaning and repairing of the outer surface of the pipeline can be completed in the same operation process, the maintenance efficiency is remarkably improved, the risk that the surface of the pipeline is polluted or corroded again after cleaning is avoided, and therefore the repairing quality is improved, and the service life of the pipeline is prolonged. The device is based on flexible holding, cleaning and laser additive machining at the same time, is suitable for maintaining submarine pipelines of various pipe diameters, and belongs to the technical field of additive repairing and manufacturing.

The application discloses a process method for improving toughness of X70 anti-large-deformation pipeline steel, and ideal mechanical properties and organizational morphology are obtained through control of components, continuous casting, heating, rolling, cooling and other processes, finally, the organizational morphology of 70-80% ferrite and hard phase components such as bainite and martensite is obtained, the uniform elongation and toughness of the pipeline steel are improved, the yield strength ratio is low, and the deformation resistance and anti-large-deformation capacity are improved. The X70 anti-large-deformation pipeline steel plate has a Charpy impact toughness of 350 J or more at-20 DEG C, a drop hammer shearing area of 95% or more, a yield strength of 480-550 MPa, a tensile strength of 600-680 MPa, a yield strength ratio of 0.78 or less, a UEL of 12% or more, and a R t1.5 / R t0.5 of 1.15 or more. The product is widely applied to pipeline engineering prone to large plastic deformation such as ground slip deformation in earthquake-prone areas, ground liquefaction settlement caused by permafrost and submarine pipeline laying.

The invention discloses a submarine pipeline erecting device for ocean engineering based on buoyancy locking, relates to the field of ocean engineering, and solves the problem that an existing pipeline erecting device is prone to being adsorbed by marine organisms, so that clamping force is reduced. The submarine pipeline erecting device comprises a device base and a pipeline body, and two clamping plates are arranged on the outer side of the pipeline body; an elastic bottom plate is slidably mounted on the inner wall of the top of the device base, two first racks are fixedly mounted at the bottom of the elastic bottom plate, a gear is fixedly mounted at the end of a clamping plate, and a first floating ball is arranged on the outer side of the clamping plate; the locking mechanism is used for positioning and tightening the two clamping plates, and the locking mechanism is mounted on the inner side of the device base; through the locking mechanism, the clamping plate can be elastically locked, the first floating ball tightens the bottom end of the clamping plate through the buoyancy of the first floating ball, the clamping force of the clamping plate on the pipeline body can be improved along with the increase of the buoyancy of the floating ball, and therefore the effect of stably fixing the pipeline body is achieved.

The invention belongs to the field of submarine pipeline risk early warning, and relates to a submarine oil and gas pipeline burying state identification method based on unsupervised machine learning and 3D Hough transformation. The method comprises three parts of pipeline data acquisition, pipeline point cloud data clustering, and pipeline state detection and identification, wherein the pipeline point cloud data clustering part comprises the following steps: firstly, removing most noise points in point cloud data by using cloth filtering and statistical filtering, and then clustering the point cloud data by using a DBSCAN algorithm of a self-adaptive threshold value; the higher the density is, the higher the class interestingness is. According to the pipeline state detection and identification part, 3D Hough transformation is used for carrying out cylinder and circular truncated cone detection on interest classes, and the exposed state of the pipeline is determined according to different detected results.

The invention provides a soil body-structure interaction boundary damage quantitative testing device and method, and relates to the technical field of geotechnical engineering test.The soil body-structure interaction boundary damage quantitative testing device comprises a stress conduction boundary shear strength and rigidity combined testing structure and a testing system integrating a shaft confining pressure-temperature collaborative loading system and a monitoring collection and process control system; through an improved slurry sample preparation method, tight connection and constant contact area between the hollow columnar soil sample and the friction pile body are ensured, and the test sealing performance is enhanced through the elastic sealing design; the real-time measurement of the rigidity of different positions in the whole shearing process is realized by virtue of the excitation damage detection element capable of synchronously moving; according to the method, the constitutive model of the marine rock-soil stress conduction boundary domain is perfected, a reliable experimental basis is provided for foundation design of deep-sea engineering such as submarine pipelines and anchoring structures, and the method has important theoretical value and engineering significance for improving design scientificity and safety of deep-sea infrastructures and preventing and controlling submarine geological disasters.

The present invention relates to the technical field of cable detection and repair, and particularly to an underwater unmanned platform dedicated to the detection and repair of submarine pipeline cables, which includes an underwater drone, a bottom plate, a cleaning seat, a support ring, and a repair ring. The four sides of the top of the underwater drone are fixedly installed with inclined base rods through bolts. The center of one end of the top of the bottom plate is fixedly installed with a detection ring through bolts. One side of the top of the bottom plate is fixedly installed with a cleaning seat through bolts. The center of one side of the cleaning seat on the top of the bottom plate is fixedly installed with a fixing ring through bolts. In the present invention, the driving gear on the repair frame is movably engaged with the rotating tooth block on the repair ring, so that the repair frame rotates stably on the outer periphery of the repair ring through the T-shaped positioning plate and the positioning roller, driving the hot air blower on the repair frame to rotate and heat the heat shrinkable tube body. The heating is uniform and stable, enabling the heat shrinkable tube body to be completely, uniformly, and stably attached to the outer periphery of the submarine pipeline cable.

The invention belongs to the technical field of energy conveying, pipeline maintenance and nondestructive testing, and discloses a non-contact submarine pipeline deformation measuring method. According to the seabed turbidity, an adaptive piezoelectric wafer is selected to weaken the influence of tide or seabed turbidity on measurement; through an RS485 bus, the MCU converts an underwater front-end distance value from an analog quantity to a digital quantity and remotely transmits the digital quantity to a portable work station on an offshore mobile platform, so that the remote transmission anti-interference capability of a detection value is improved; a bent pipeline scanning device is used for carrying an ultrasonic detection front end to realize radial distance measurement of a pipeline, and a distance value is converted into diameter change so as to reflect pipeline deformation; in combination with the axial translation interval delta x and the circumferential rotation interval delta alpha, the distance value d is converted into point cloud data under a three-dimensional coordinate system, then three-dimensional curved surface reconstruction is conducted on the point cloud data, and the pipeline deformation quantity can be visually reflected.

The invention discloses a sealing device for a submarine pipeline dry-type cabin, and relates to the technical field of dry-type cabins, the sealing device comprises a controller and two flexible sealing devices, each flexible sealing device comprises a vertical telescopic driving mechanism, a supporting part, a flexible sealing door and a sealing door opening and closing execution mechanism, the sealing door opening and closing executing mechanism comprises two opening and closing executing assemblies symmetrically installed on the supporting component, each opening and closing executing assembly comprises a driving component, surrounding supports and a pressing plate, and the two driving components are used for driving the two surrounding supports to be opened or closed; when the two surrounding supports are closed, the two connecting parts can be attached under pressing of the two pressing plates, the lower ends of the two lower arc parts can be in butt joint, and the top arc part and the two lower arc parts are all attached to the submarine pipeline. The device ensures that the dry type cabin can be reliably sealed with the submarine pipeline under the dynamic working condition, the requirement for the coaxiality of the dry type cabin and the submarine pipeline is lowered, and the submarine laying efficiency of the dry type cabin is improved.