105 results about "Sea bottom" patented technology

A method for performing one or more capture utilization and sequestration (CCUS) operations. The method includes obtaining, from a vibration sensor, ambient noise data associated with a subsurface of a resource site. The method also includes generating, from the ambient noise data, passive virtual shot data indicating temporal properties or interactions present in the ambient noise data. The method also includes determining, using the passive virtual shot data, shot analysis data. The method also includes generating, using the shot analysis data, a model representing changes in past CCUS operations for the resource site. The method also includes initiating, based on the model, one or more additional CCUS operations for the resource site.

The present invention addresses the problem of providing a tension-mooring cable for a tension-moored floating body, with which it is possible to, without adjusting the lengths of the tension-mooring cables in each mooring cable bundle that moors and supports the tension-moored floating body, equalize tension generated in the tension-mooring cables and prevent occurrence of resonance with the frequency of waves on the ocean. The problem is solved by a mooring cable that is for a tension-moored floating body, and that links a connection part 5b formed on the tension-moored floating body and a sea bottom-mooring part 9 fixed to a sea bottom 103. The tension-mooring cable is configured such that tension is generated in a tension-mooring cable 7 due to buoyancy generated in a tension-moored floating body 5 when the tension-mooring cable 7 is linked to the tension-moored floating body 5, and the tension-moored floating body 5 can be held in a tension-moored state. The tension-mooring cable 7 is configured such that a low rigidity mooring cable 7b, having a low extensional rigidity which is the product of the modulus of longitudinal elasticity and the cross-sectional area of a cable material, is linked to a high rigidity mooring cable 7a having a higher extensional rigidity than that of the low rigidity mooring cable 7b, by a linking tool.

The invention discloses a seabed shallow casing section thermal insulation structure for polar region supercritical carbon dioxide drilling, which comprises a casing, a thermal insulation coating, a protective coating, an annular cement slurry layer, an electric heating pipe, a sensor module, a wireless conductive module, a ground system and a seabed wireless transmission module, and is characterized in that the electric heating pipe is fixed on the outer wall of the casing through a hoop; the outer wall of the casing pipe is sequentially coated with a heat preservation coating, a protective coating and an annular cement paste layer from inside to outside, the wireless conductive module is integrated at the end of the casing pipe, and the ground system comprises a ground data acquisition system and a ground control center. The sea surface platform is provided with a ground data acquisition system and a ground control center which are connected with the seabed wireless transmission module through an umbilical cable, and temperature and pressure data acquired by the sensor module are uploaded to the ground control center. According to the invention, the problems of rapid heat loss, annular air channeling, casing mechanical property degradation, poor drilling fluid fluidity and the like of the seabed shallow casing section in the polar region extreme low-temperature environment are solved.

The supporting structure comprises a floating pontoon body, the top end of the floating pontoon body is connected with a fence, the top end of the floating pontoon body is connected with a power control box, the fence is provided with a first sealing door, the top end of the floating pontoon body is connected with a mechanical arm driven by electric hydraulic pressure, and the mechanical arm is provided with a second sealing door. A fixing mechanism is installed on the pontoon body, a supporting mechanism is installed on the mechanical arm, and an adjusting mechanism is arranged on the supporting mechanism. After the pontoon body is driven to the operation sea surface, a gear motor is started to rotate a winding roller, so that an iron chain is placed downwards, the iron chain lowers a hook anchor to the sea bottom, the hook anchor is inserted into the sea bottom, the pontoon body is stabilized on the water surface, stability of the pontoon body is ensured, a second sealing door is opened, personnel climb on a supporting plate, and the second sealing door is closed; the mechanical arm is started and moves the supporting mechanism to an operation position on the sea surface, and therefore operation of workers is facilitated.

The utility model discloses a tension leg floating type wind power platform pile foundation connecting device, and relates to the technical field of tension leg floating type wind power platform mooring connection, the tension leg floating type wind power platform pile foundation connecting device comprises a bottom connecting mechanism and a steel cable protection mechanism, the bottom connecting mechanism comprises a welding back plate, and a tongue plate is arranged on the welding back plate; the upper end of the tongue plate is connected with a steel cable joint through a pin shaft, a steel cable is connected to the steel cable joint, and the two ends of the tongue plate are locked and fixed through locking mechanisms respectively. The steel cable protection mechanism is located on one side of the pile foundation, and the steel cable is placed on the steel cable protection mechanism after being connected and used for preventing the steel cable from being bent and damaged when the steel cable is pre-laid to the seabed. The device is simple in structure, reliable in performance, convenient to operate and capable of adapting to underwater rapid connection, only one ROV is needed for auxiliary operation in the whole operation process, the tie-back installation process of the mooring rope and the anchoring device of the tension leg wind power platform is simplified, and the mooring and installation cost of the tension leg wind power platform is reduced.

The utility model discloses a fan blade type friction nanometer generator based on seabed ocean current energy, which comprises a shell, fan blades and a friction generator, a power generation cavity and a blade cavity are respectively arranged at two ends in the shell, the power generation cavity and the blade cavity are two mutually independent cavities, the fan blades are rotatably arranged in the blade cavity, the friction generator is arranged in the power generation cavity, and the friction generator is arranged in the friction generator. The fan blades and the friction generator are coaxially arranged and are in transmission connection through the magnetic coupling part; a water flow channel is formed in the shell, a flow guide cover is arranged in front of the fan blades, and water flow enters the water flow channel through the flow guide cover and pushes the fan blades to rotate. By arranging the power generation cavity and the blade cavity which are isolated from each other, the power generation component and the driving component are installed separately, transmission is conducted through the magnetic coupling component, a dynamic sealing structural part does not need to be installed, and the power generation component can be independently installed in the power generation cavity in a sealed mode; and meanwhile, as no dynamic sealing structural member is arranged, the transmission resistance is greatly reduced, and the mechanical loss is reduced.

The invention discloses a deep-sea mining vehicle reduced scale model and simulated deep-sea sediment interaction experiment device. The device comprises a land mud pool, a double-side jacking mechanism, a simulated laying system and a reduced scale robot prototype; the land mud pool comprises a main mud pool and self-prepared sediments loaded in the main mud pool and used for simulating the seabed environment, and the scale robot prototype is placed on the self-prepared sediments so as to autonomously advance; the simulated laying system comprises a supporting table, a winch, a hoisting frame and a steel cable; according to the invention, the influence of the simulated laying system, the steel cable and the hoisting frame on the seabed movement process of the mining vehicle is creatively considered, and the slope is considered, so that the design of the climbing movement experiment device at different angles is realized; according to the invention, the interaction research of the real deep-sea mining vehicle and the substrate under the condition of a flow field can be obtained, and the application of the vehicle terramechanics in the deep-sea mining vehicle marching dynamics process is extended.

The invention discloses an ocean bottom seismograph putting device, relates to the technical field of seismograph putting, and solves the problems that after a seismograph stably falls to the seabed, the bottom of the seismograph is horizontally placed on the ground of the seabed, the position of the seismograph is easy to deviate or incline under the long-term flowing of seabed water flow, and the seismograph cannot be put on the seabed. The seismograph throwing device comprises a throwing base and a protective shell, the protective shell is fixedly installed at the upper end of the throwing base, and a first flow guide hole and a second flow guide hole are formed in the throwing base in a matched mode, so that the seismograph can not be normally used, and the use efficiency of the throwing device is reduced. Water flow can enter through the first flow guide hole and be discharged from the second flow guide hole, the impact force of seawater on the whole device is reduced, meanwhile, negative pressure is formed in the device through cooperation between the first flow guide hole and the second flow guide hole, and the stability of the position after the whole device is placed can be improved.

The invention discloses a thermoelectric chemical circulating system for an ocean underwater vehicle and an operation method of the thermoelectric chemical circulating system, and belongs to the technical field of ocean underwater vehicles, the thermoelectric chemical circulating system comprises a thermoelectric chemical circulating device and a power generation control system which are arranged on the ocean underwater vehicle, and the thermoelectric chemical circulating device comprises an oxidation-reduction battery and a power storage unit; the power generation control system comprises a control unit and a temperature sensor, and the temperature sensor is connected with the control unit; and the redox battery and the power storage unit are connected with the control unit. According to the invention, the redox battery has voltages with opposite signs and similar magnitudes at seabed and sea surface environment temperatures, so that the underwater vehicle spontaneously performs discharge reactions with opposite directions when reaching the sea surface and the seabed; the control unit switches on a circuit at a corresponding temperature point according to a signal of the temperature sensor, and stores electric energy in the power storage unit to supply power to the underwater vehicle; the ocean natural temperature difference is used for driving thermoelectric chemical circulation, external power supply-free work of the ocean underwater vehicle is achieved, and the underwater operation time is prolonged.

1. Name of the designed product: Ceramic cup (famille-rose gold, silver and black ground, cup with gold shrimps, autumn moon and sea bottom world). 2. Use of the designed product: for containing liquid. 3. Design points of the designed product: combination of shape and pattern. 4. Picture or photograph best indicating the design points: perspective view 1. 5. The bottom view has been expressed in perspective view 2, the bottom view is omitted.

The invention discloses an in-situ measurement system for the particle size of suspended solids at the bottom layer of the sea, and the system comprises a light source, a frame structure, a support structure, a camera, a support adjustment module, an attitude sensor, an optical fiber, and a control module, and the control module is connected with the light source, the camera, the support adjustment module, and the attitude sensor through the optical fiber. The light source and the camera are placed in the frame structure through the support structure. The light source is used for generating strip-shaped light meeting preset requirements; the support adjusting module is used for adjusting the height and angle of the support structure so as to adjust the height and angle from the light source and the camera to the seabed. The attitude sensor is used for detecting the inclination angle of the frame structure placed on the seabed; the control module is used for receiving attitude information sent by the attitude sensor and an image sent by the camera, sending a control instruction and calculating the particle size of the ocean bottom layer suspended matter according to the image. The embodiment of the invention can measure the particle size of the marine bottom layer suspended matter. The method can be widely applied to the technical field of marine survey.

The present application relates to a kind of ecological island building fill unit, fill unit middle is provided with through hole, fill unit includes shell surface layer, middle structural layer and internal filling layer;Shell surface layer is made of neutral material, to ensure that the sea bottom water quality and related environmental indicators where fill unit is after sinking to bottom are not affected;Structural layer uses high-performance corrosion-resistant material, for bearing the water head pressure after fill unit sinking to bottom, unit stacking transmission pressure and mutual collision force, the whole outside of structural layer is covered by shell surface layer, and internal full-closed cavity is formed;Filling layer uses the full-closed cavity surrounded by structural layer, and fills crushed construction waste.The present application has the advantages of simple structure, large specific weight, easy production and transportation, etc.

The utility model relates to the technical field of artificial fish reefs, and discloses a split mounting type conical tower-shaped artificial fish reef which comprises an artificial fish reef assembly, stabilizing pieces are evenly distributed at the lower end of the artificial fish reef assembly, extension blocks are further arranged on the front side and the rear side of the artificial fish reef assembly, and positioning insertion columns are inserted into the surfaces of the extension blocks in a penetrating mode. Reinforcing components are arranged on the left side and the right side of the artificial fish reef assembly, the artificial fish reef assembly is transported to the coast side, then inserting columns at the upper end and the lower end of a connecting rod are inserted into inserting holes A and inserting holes B correspondingly, then bolts are used for fixing, and therefore splicing and assembling of the artificial fish reef assembly can be completed; the artificial fish reef assembly can be placed in the sea, at the moment, the weight blocks can sink into the sea bottom under the gravity of the weight blocks, the weight blocks are arranged on the left side and the right side of the artificial fish reef assembly, the weight of the artificial fish reef assembly can be effectively increased, the stability of the artificial fish reef assembly is improved, and living beings can conveniently inhabit.

The invention discloses an ocean platform-pipe column-seabed equipment multi-body coupling experiment device and method, and the device comprises an experiment frame which comprises a top pedestal, a bottom pedestal, and a supporting mechanism disposed between the top pedestal and the bottom pedestal; the drilling simulation rotating system comprises a motor and a simulation drill rod, the motor is installed on the top base, the upper end of the simulation drill rod is detachably connected with the motor, and the lower end of the simulation drill rod is provided with a simulation underwater wellhead through a connecting device; seabed soil is contained in the soil box; and the detection device is used for detecting working parameters of the simulation drill rod, and the working parameters comprise any one or combination of the following parameters: stress parameters, rotation speed and torque. Experimental simulation requirements of deep-sea oil exploration and development can be met, so that actual production is guided, and the drilling efficiency and the success rate are improved.

1. Name of the designed product: Ceramic cup (famille-rose gold and black ground cup with autumn moon and sea bottom design). 2. Use of the designed product: for containing liquid. 3. Design points of the designed product: combination of shape and pattern. 4. Picture or photograph best indicating the design points: perspective view 1. 5. The bottom view has been expressed in perspective view 2, and the bottom view is omitted.

The present application relates to a kind of bottom-supported net cage of segmented lifting control, comprising: net cage body, and variable buoyancy cabin is arranged at the bottom of net cage body;Air pipe, one end of the air pipe is connected to the variable buoyancy cabin;Air pump, the air pump is connected with the end of the air pipe extending to sea surface;First drain pipe, one end of the first drain pipe is arranged in the first preset position in the variable buoyancy cabin;First switch valve, the first switch valve is arranged on the first drain pipe;First counterweight, the first counterweight is connected to the bottom of the net cage body;Second counterweight, the second counterweight is connected to first counterweight by the rope of preset length.Net cage body will hover in the water layer at a certain distance from the sea bottom during floating, so that the cultured fish in the net cage body has sufficient time to adapt to pressure change, and reduces the risk of rising air bladder to cultured fish caused by huge pressure difference.

The utility model belongs to the field of submarine cable protection pipe, especially relates to a submarine cable pipeline steady flow protection pipe, including protection pipe body, the circumference of protection pipe body is provided with several steady flow fins extending along the length direction, steady flow fin is set out of the way, makes it convenient for embedding the sea bottom, the utility model provides a kind of submarine cable pipeline steady flow protection pipe, sets up steady flow fin, it is convenient for embedding the sea bottom, can increase the stability of whole, reduce the influence of receiving sea bottom turbulent flow;Protection pipe body is thermoplastic elastomer material protection pipe body moulding integrated, and unit arc body is movably connected between, unit arc body is set on submarine cable by being pried apart to two sides and being fixed through fixing piece, and installation can be completed, it is convenient to install.

Provided is a detection device 1 that detects an upwelling region, wherein the detection device 1 comprises: a data integration unit 14 that integrates sea surface temperature data in a predetermined region, chlorophyll-a data, sea surface altitude data, and sea bottom altitude data; and a classification unit 15 that identifies an upwelling region from the integrated data by using a classification algorithm.

The invention discloses a shallow seabed horizon extraction method and device, electronic equipment and a storage medium. Comprising the steps of updating an initial seabed horizon time sequence corresponding to amplitude envelope data based on a median filtering algorithm and a linear interpolation algorithm, and generating a middle seabed horizon time sequence; for each trace in the amplitude envelope data, traversing each sampling point in the trace along a sampling time increasing direction under the seabed horizon time corresponding to the trace in the middle seabed horizon time sequence, and determining a first target sampling point of which the amplitude is greater than or equal to an amplitude threshold corresponding to the trace; updating the middle seabed horizon time sequence based on the sampling time corresponding to the target sampling point, and iteratively executing updating on the initial seabed horizon time sequence based on a median filtering algorithm and a linear interpolation algorithm to generate a target seabed horizon time sequence; and extracting the seabed horizon in the original shallow profile data based on the target seabed horizon time sequence. The method improves the efficiency and precision of seabed horizon extraction.

The invention relates to the technical field of deep sea mineral aggregate collection, and particularly discloses a mineral aggregate collection device suitable for a cobalt-rich crust complex ore deposit, the mineral aggregate collection device comprises a collection main body mechanism used for collecting mineral aggregate, the collection main body mechanism comprises a self-adaptive terrain mechanism, and the self-adaptive terrain mechanism comprises a left self-adaptive adjusting gear train and a right self-adaptive adjusting gear train; a collection cover is arranged in the middle of the self-adaptive terrain mechanism; the collecting cover is of an arc-shaped structure with a preset angle and comprises an inlet end and an outlet end, and the inlet end is connected with the self-adaptive terrain mechanism. Wheels can be automatically adjusted to ascend and descend according to micro-topographic fluctuation through the left and right self-adaptive adjusting wheel trains, it is guaranteed that the collecting device stably moves in a complex cobalt-rich crust ore deposit area at the deep sea bottom, the backwater spraying flow can be regulated and controlled in real time through the backwater spraying system, the spraying force is adjusted according to cobalt-rich crust ore materials under different working conditions, and the collecting efficiency is improved. The adaptability to different acquisition working conditions is improved, and the acquisition efficiency is ensured.

The application relates to the technical field of deep-sea mineral aggregate collection, and particularly discloses a deep-sea mineral aggregate collection device, which comprises a collection main body mechanism for collecting mineral aggregates, the collection main body mechanism comprises a self-adapting terrain mechanism, the self-adapting terrain mechanism comprises left and right self-adapting adjusting wheel systems, a collection cover is arranged in the middle of the self-adapting terrain mechanism, and the left and right self-adapting adjusting wheel systems are used for adjusting the height of the collection cover; the collection cover is in an arc structure with a preset angle, the collection cover comprises an inlet end and an outlet end, and the inlet end is connected with the self-adapting terrain mechanism. The left and right self-adapting adjusting wheel systems can automatically adjust the lifting of the wheels according to the micro-terrain fluctuation, the collection device can stably move in the complex cobalt-rich crust deposit area of the deep-sea bottom, the backwater jetting flow can be controlled in real time through a backwater jetting system, the jetting intensity can be adjusted according to the cobalt-rich crust aggregate of different working conditions, the adaptability to different collection working conditions is improved, and the collection efficiency is ensured.

The invention relates to the technical field of marine resource exploration and underwater operation control, in particular to a deep sea grounding type direct current method detection cable laying and recovery control method based on an intelligent detection platform, which comprises the following steps: S1, obtaining seabed topographic relief data through the intelligent detection platform, and outputting initial laying pose parameters; s2, the winch cable laying length, tension fluctuation and intelligent detection platform motion attitude data in the laying process are recorded synchronously; s3, constructing an attitude adjustment strategy and outputting a corresponding attitude control instruction; and S4, the intelligent detection platform is controlled to dynamically adjust the posture and the moving path of the platform in the recovery process, and it is ensured that the cable is kept within the safe tension range in the recovery process. According to the method, high-precision laying and safe recovery of the deep-sea direct-current electric method detection cable are realized through track fitting modeling, tension posture linkage regulation and ocean current load prediction compensation.

The invention belongs to the technical field of trawling devices, and particularly relates to a deep sea water bottom trawling device which comprises a fishing boat and a winch arranged on a cross beam of the fishing boat, and the winch is used for winding a steel rope and a fishing net; the flushing mechanism comprises a storage bin formed in the fishing boat, a water tank with a liquid inlet pipe is fixedly installed in the storage bin, a water suction pump is fixedly installed at the top of the cross beam, a water conveying pipe and a water suction pipe are arranged on the water suction pump, and one end of the water suction pipe is communicated with the interior of the water tank; through the designed structure, the fished steel rope and the fished net are pre-flushed with fresh water, so that crystals formed by residual salt in sea water on the fished net and the steel rope are reduced, and the conditions that electrochemical corrosion is caused, so that synthetic fibers become brittle and fracture, and the steel rope is rusted and stuck are effectively avoided.

The utility model discloses a high protective light diving suit, including diving suit coat and diving trousers, the lower extreme fixed connection of diving suit coat has diving trousers, the outer wall positioning of diving trousers installs the knee protection mechanism. The utility model discloses a high protective light diving suit, the knee protection mechanism of setting can strengthen the protection effect of diving suit coat knee, when diving, the knee can contact hard material, coral, rock and the like, and the knee protection mechanism can effectively prevent the knee from being injured, in some diving activities, such as cave diving or wreck exploration, the knee protection mechanism can provide additional security, prevent the knee from being injured in narrow space, in some diving activities that need walking on the sea bottom, the knee protection mechanism can provide better protection, adapt to different seabed topography, can effectively absorb the impact force, protect the knee.

To provide a floating type offshore windmill system including a structure which is helpful for achieving replacement of large components of a floating type offshore windmill.SOLUTION: A floating type offshore windmill system has a floating type offshore windmill, a main floating body, and a mooring body. The floating type offshore windmill includes: blades configured to receive wind; a hub to which the blades are fixed; a nacelle which stores a power generator for converting rotational energy of the hub into electric power; a tower supporting the nacelle; and a sub floating body supporting the tower. The main floating body is moored at a sea bottom by the mooring body and has a sub floating body insertion space which is fitted in the sub floating body. The sub floating body inserted into the sub floating body insertion space is connected to the main floating body in a manner that enables disconnection at the connection part with the main floating body.SELECTED DRAWING: Figure 1

The invention relates to the technical field of geological exploration, in particular to a marine geological exploration early warning device. The invention provides a sea geological exploration early warning device which comprises a sea vein geological exploration device, iron rings, a fixing plate, fixing rods and an air bag, the iron rings are symmetrically arranged on one side of the sea vein geological exploration device, the fixing plate is arranged on the top of the sea vein geological exploration device, the fixing rods are symmetrically arranged on the two sides of the top of the fixing plate, and the symmetrical fixing rods are jointly and detachably connected with the air bag. Air inlet ports are symmetrically formed in the bottom of the air bag, and the symmetrical air inlet ports are detachably connected with the symmetrical fixing rods in a clamped mode. The air bag is inflated through the compressed air tank, the air bag expands continuously, and the sea vein geological prospecting device is pulled out under the action of buoyancy of air in the air bag and ascends continuously until going out of the sea surface, so that the sea vein geological prospecting device is lifted from the sea bottom, and the effect that workers can recycle the sea vein geological prospecting device conveniently is achieved.

The invention discloses a satellite-borne laser water depth correction and extraction method considering sea surface waves, and the method comprises the following steps: carrying out the sea surface wave fitting of satellite-borne laser sea surface photon points through employing a smooth spline function, and obtaining the instantaneous wave slope and elevation value of each sea surface photon position; modeling the incident line of each photon point according to the fitting result, and matching the seabed photon points with the sea surface photon points based on the modeling line of the incident light to calculate an initial water depth value; carrying out refraction correction on the initial water depth value according to a wave angle and a photon incidence angle of a sea surface wave fitting result of a corresponding position in combination with marine environment characteristics; and performing geophysical correction on a result after refraction correction to obtain a water depth extraction result based on the average sea level. Through water depth correction considering the sea surface wave angle and the wave height, sounding errors caused by sea surface waves are effectively compensated, and the satellite-borne laser water depth extraction precision and reliability are remarkably improved.

The utility model relates to the technical field of fixing instruments, in particular to a portable fixing device for seawater shallow cutting, which comprises an adjusting component, a fixing component, a fixing component and a fixing component, the adjusting component comprises a moving frame, a moving rod and a threaded rod, the moving rod is connected with one side of the moving frame, and the threaded rod is in threaded connection with the inner wall of the moving frame; the fixing assembly is arranged on the outer wall of the moving rod and comprises a fixing frame, a fixing rod connected with one side of the fixing frame and a connecting plate arranged on the outer wall of the fixing frame; the supporting assembly is arranged on one side of the fixing assembly and comprises a supporting frame, a first support connected with the top of the supporting frame and a second support connected with the bottom of the supporting frame. By arranging the supporting assembly, the superficial section instrument can be driven to rotate by rotating the supporting assembly, so that the superficial section instrument leaves the sea surface, objects driven by undercurrent of the sea bottom can be prevented from impacting the superficial section instrument, and the risk that the superficial section instrument is damaged is reduced.

Provided is a floating offshore wind turbine system having a structure useful for replacing large components of a floating offshore wind turbine. A floating offshore wind turbine system having a floating offshore wind turbine, a main floating body, and a mooring body, the floating offshore wind turbine system characterized in that: the floating offshore wind turbine has blades for receiving wind, a hub to which the blades are fixed, a nacelle for storing a generator for converting rotational energy of the hub into electric power, a tower for supporting the nacelle, a sub-floating body for supporting the tower, and a sub-floating body connection part that can be fitted to a transport ship connection part; and the main floating body is moored to the sea bottom by the mooring body, and has a sub-floating body insertion space into which the sub-floating body is inserted.

Provided is a floating offshore wind turbine system having a structure useful for implementing replacement of a large component of a floating offshore wind turbine. The floating offshore wind turbine system includes a floating offshore wind turbine, a main floating body, and a mooring body. The floating offshore wind turbine has: blades that receive wind; a hub to which the blades are fixed; a nacelle that houses a generator that converts rotational energy of the hub into electric power; a tower that supports the nacelle; and a sub-floating body that supports the tower. The main floating body is moored to the sea bottom by the mooring body, and has a sub-floating body insertion space into which the sub-floating body is inserted. The sub-floating body inserted into the sub-floating body insertion space is detachably connected at a connection part with the main floating body.