23 results about "Tension-leg platform" patented technology

The invention provides a mooring device for a tension leg platform pool test and a test method. The device comprises a first mooring rope, an extension spring and a second mooring rope which are connected in sequence, and the second mooring rope is connected with a tensioning mechanism; the specification of the cable meets the conditions that A is the sectional area of the cable, k is the safety coefficient, Tmax is the maximum expected tension, sigmaallow is the allowable stress of a cable material, d is the diameter of the cable, L is the effective stress length of the cable, R is a judgment threshold value, Ks is the rigidity of an extension spring, E is the elastic modulus of the cable material, and model selection is conducted on the cable according to the target tension force range; the system equivalent stiffness Ktot in the test is ensured to be dominated by the extension spring, the contribution of the cable stiffness to deformation can be ignored, and the accuracy of equivalent stiffness control of the pool test and the repeatability of the test are improved.

The invention discloses a low-friction implementation method for simulating the dynamic installation process of a tension leg platform, and the method comprises the steps: connecting a floating platform, a tower cylinder and a floating cylinder to form a platform main body structure, and arranging a deck lifting point at one side, facing the floating cylinder, of the floating platform, the deck lifting point is connected with a steel wire rope; the anchoring device is used for leading out one end of the steel wire rope away from the deck lifting point through a fairlead arranged on the buoy and fixing to the bottom of the pool; the cable guide hole is provided with a circular ring guide piece, and the steel wire rope penetrates through the circular ring guide piece so as to avoid clamping stagnation or sudden sliding of the steel wire rope in the dynamic loading process. According to the low-friction implementation method for simulating the dynamic installation process of the tension leg platform, the guide function of the steel wire rope and the structure of the floating body of the platform are functionally decoupled through the design of the ring guide piece with the separated structure, path adjustment, configuration change and parameter iteration can be conveniently carried out in the test process, and it is guaranteed that the steel wire rope is evenly stressed in the sliding process.

The application provides a small star-shaped tension leg platform installation method, which comprises the following steps: S1, transporting a lower floating body to a work sea area and connecting the lower floating body with a suction anchor pre-installed on a seabed; the lower floating body is submerged to a preset depth and balanced; S2, dry towing an upper floating body to the work sea area; connecting the upper floating body and a towing boat through a temporary mooring cable; inflating an air bag to make the upper floating body float on the water surface; S3, slowly floating the lower floating body and aligning a first sleeve, a second sleeve and a third sleeve on the upper floating body with a first guide pile, a second guide pile and a third guide pile on the lower floating body in sequence, slowly transferring the weight of the upper floating body to the lower floating body until the air bag is completely floated out of the water surface; S4, tensioning an anchor chain, discharging the gas in the air bag and completing the installation; in the whole installation process, a large floating crane is not needed, the installation cost is reduced, the docking difficulty is effectively reduced and the docking efficiency is improved by adopting the way of sequentially docking and positioning the guide piles and the sleeves.

A tension leg platform assembly is provided, comprising a buoyant body and a number of mooring assemblies attached thereto, which extend between the buoyant body and a fixed foundation on the seabed. Each mooring assembly comprises at least one elongate member having an upper end and an opposite lower end. At least one of said upper end and lower end by means of a connector assembly is connected to the buoyant body or the fixed foundation, respectively. Said connector assembly is provided with a first yoke which is connected to the buoyant body or fixed foundation for a rotation around a first axis which extends substantially horizontally at a first level, and a second yoke attached to the elongate member which is mounted in the first yoke for a rotation around a second axis which extends substantially perpendicularly to the first axis at a second level. The second level is further away from the upper end or lower end, respectively, of the elongate member than the first level.

The application discloses a kind of marine drilling dry wellhead blowout preventer tensioner, including two tensioning liquid cylinders, chain and energy storage control pry, each tensioning liquid cylinder is connected with blowout preventer group hanging by chain, two tensioning liquid cylinders are communicated with the high-pressure outlet of energy storage control pry by a high-pressure hose respectively, two tensioning liquid cylinders are also communicated with the low-pressure return port of energy storage control pry by a low-pressure hose respectively.The device of the application meets the top tension requirement of blowout preventer for offshore jack-up drilling platform and tension leg platform, and also has high integration degree, good stability, good practicality and popularization value.

The utility model belongs to the field of offshore wind power, and discloses a tension leg platform system with a tendon balancing device, which comprises a tension leg platform, a plurality of tendons are annularly distributed on the periphery of the lower end of the tension leg platform, and the lower ends of the tendons are connected with a suction cylinder, and is characterized in that the tension leg platform is connected with the tendons through the tendon balancing device; the tendon balancing device comprises a telescopic assembly and a driving assembly, the telescopic assembly comprises a telescopic fixed part and a telescopic movable part which are in telescopic sliding fit, the telescopic fixed part is connected with the tension leg platform, the telescopic movable part is connected with the tendon, and the driving assembly drives the telescopic movable part to stretch out and draw back relative to the telescopic fixed part. According to the tension leg platform, the stress of the tendons is dynamically adjusted through the tendon balancing device, the stress state of the platform is adjusted in real time, and the problem of inclination and vibration caused by environmental factors such as wind waves and flow is solved.

This invention discloses a modular offshore wind turbine tension leg foundation structure and its construction method, aiming to provide a modular offshore wind turbine tension leg foundation structure and its construction method that can effectively reduce the cost of offshore wind power projects and the installation risk of tension leg foundation structures, while effectively shortening the construction time. A modular offshore wind turbine tension leg foundation structure includes: a platform body, including a central column and several buoys evenly distributed around the central column, the central column and each buoy being connected as a whole by a support; a suction cylinder foundation module, including several suction cylinders, each suction cylinder being connected as a whole by a connecting beam; a tension leg mooring module, including several mooring devices, each mooring device including a mooring cable and a mooring cable deployment and retrieval device located on the platform body, the lower end of the mooring cable being connected to the suction cylinder foundation module; the mooring cable deployment and retrieval device can release the mooring cable, allowing the suction cylinder foundation module to separate from the platform body and be lowered to the seabed.

The invention provides a large-stroke rapid-lifting composite tendon tension leg platform and a construction method thereof, and aims to solve the technical problems that an existing floating platform is poor in stability, high in tendon tensioning difficulty and low in efficiency. Comprising a floating type frame and a gravity anchor, and the floating type frame comprises an elevated platform and a deep diving floating body; the elevated platform is connected with the gravity anchor through a plurality of first tension tendons, and the first tension tendons are used for adjusting the submerging depth of the floating type frame in water; and the deep diving floating body is connected with the gravity anchor through a plurality of second tension tendons. The composite tendon tension leg platform can rapidly tension the tension tendon, the height of the platform away from water can be adjusted according to needs, and the composite tendon tension leg platform is high in stability, easy to construct and suitable for various scenes.

The invention discloses a tension leg platform tension tendon real-time tension measuring device which comprises a rocker arm, a first shackle and a second shackle, the first shackle and the second shackle are connected to the two ends of the rocker arm respectively, the first shackle is connected to a platform, the second shackle is connected to a tension tendon, and the first shackle and the second shackle are connected to the rocker arm. The rocker arm is arranged between the platform and the tension tendon; the rocker arm is connected with a first fixing block and a second fixing block, a tension adjusting arm is connected between the first fixing block and the second fixing block through a connecting rod, and the tension adjusting arm is connected with an optical fiber force transducer, so that when the rocker arm slightly deforms, the tension adjusting arm deforms synchronously, and the optical fiber force transducer outputs a signal through a cable. Therefore, the tension value of the tension tendon is obtained. The real-time tension measuring device for the tension tendon of the tension leg platform is provided with two sets of measuring systems for respective measurement and mutual verification, and meanwhile, the real-time tension measuring device is simple in structure and convenient to operate, maintain and replace.

This invention discloses a tension leg offshore wind turbine platform and a dynamic balance adjustment method for its tendons. The wind turbine platform includes a central column, side buoys, a floating bridge, and tendons. Multiple ballast tanks are located inside both the floating bridge and the side buoys. Multiple emergency water inlets are located at the bottom of the floating bridge and the top and bottom of the side buoys. A ballast tank connection port, selectively connecting to the ballast tanks of the floating bridge, is located at the lower part of the ballast tank near the buoy. A ballast system is installed inside each ballast tank, which can perform ballast discharge or selectively transfer water from one ballast tank to another. This invention can selectively adjust the internal ballast based on tendon tension through natural flow and / or mechanical means. It can determine the location and number of tendon failures and formulate emergency control strategies based on the tendon failure status. This not only improves the lifespan of the mooring system but also enhances the self-survival performance of the tension leg platform under mooring system failure.

This invention provides a gravity-based multi-tension-leg floating wind turbine platform, comprising: a wind turbine and its tower, a buoyancy chamber, a tensioning mooring system, and a gravity foundation. The wind turbine and its tower are mounted on top of the buoyancy chamber; the buoyancy chamber is connected to the gravity foundation arranged on the seabed via the tensioning mooring system to form a tension leg restraint system. The tensioning mooring system, by significantly increasing the number and rationally distributing the cables, distributes the platform's tension under the influence of wind, waves, and currents among more tensioning components, thereby reducing the tensile force and fatigue load requirements of a single tensioning mooring member and its end connecting components, and reducing the engineering implementation difficulty caused by excessive stress on the tension legs. The gravity foundation is fixed to the seabed by its own weight, eliminating the need for piling operations required for traditional tension-leg platforms, significantly reducing the difficulty and cost of offshore construction.

The utility model discloses a tension leg type wind wave coupling power generation foundation which comprises a stand column used for installing a wind turbine generator and a fan tower drum, the stand column is fixed to a frame, a buoy is fixed to the bottom of the frame and is moored through tension tendons, the tension leg type wind wave coupling power generation foundation comprises an oscillating floater, and a pulling rope is arranged on the buoy to pull the oscillating floater. A winch, a generator, a storage battery and a motor are arranged in the buoy, the lower end of the traction rope is wound around the winch, the generator and the motor are in transmission connection with the winch, and the storage battery is electrically connected with the generator and the motor. The problem that an offshore power generation platform adopting a floating structure to capture wave energy transmits an overhigh load to the power generation platform under an extreme sea condition to affect safety is solved.

The invention discloses a three-buoyancy-box tension leg platform mooring system and a working method thereof.The system adopts a three-buoyancy-box tension leg platform as an ocean platform, the system further comprises a damping assembly and three mooring ropes, the damping assembly comprises a floating anchoring part, three first springs and three reset spring sets, and the floating anchoring part is connected with the three first springs; the floating anchoring parts are arranged at the joints between the stand columns and the three floating boxes. Wherein the stand column is used for loading a fan, and the three buoyancy tanks and the stand column serve as a foundation structure of the fan; when the fan is subjected to environmental load, the buoyancy tank section of at least one of the three mooring cables applies tensile force opposite to the environmental load to the buoyancy tank corresponding to the buoyancy tank section through the corresponding reset spring set, and the initial sections of the rest mooring cables are pulled by the floating anchoring part to enable the buoyancy tank section of the other mooring cables to be fixed. The corresponding reset spring sets apply pulling force opposite to the environmental load to the corresponding buoyancy tanks, the three buoyancy tanks and the stand columns are prevented from fluctuating along with the environmental load, and the foundation structure of the draught fan tends to be in a stable state.

The invention is directed to a reusable tension element for a tendon for tension leg platforms, said tension element comprising a lamella comprising two terminal ends and having an essentially rectangular cross-section with an aspect ratio that is defined as the ratio between the longest side and the shortest side of the rectangle of at least 10, preferably at least 15, wherein said lamella has thickness of at least 1 mm, and a length of at least 20 m, wherein said lamella comprises a material having an elastic modulus of more than 50 GPa. Further aspects of the invention are a tendon comprising said elements, a transportation system to transport said elements, and a tension leg platform that is tethered to a seabed with said tendons.

Systems, devices and methods enable generation and monitoring of support platform structural conditions in a manner that overcomes drawbacks associated with conventional approaches (e.g., load cells) for generating and monitoring similar operating condition information. In preferred embodiments, such systems, devices and methods utilize fiber optic strain gauges (i.e., fiber optic sensors) in place of (e.g., retrofit / data replacement) or in combination with conventional load cells. The fiber optic sensors are strategically placed at a plurality of locations on one or more support bodies of a support platform. In preferred embodiments, the fiber optic strain gauges are placed in positions within a hull and / or one or more pontoons of an offshore platform. Such positions are selected whereby resulting operating condition data generated by the fiber optic strain gauges suitably replaces data received by conventionally constructed and located load cells of an offshore platform (e.g., a TLP).

The invention discloses a tie-back method for a tension leg floating type fan. The tie-back method comprises the following steps that a mooring steel cable is connected with a pile anchor, pre-laying and wet storage are conducted on the mooring steel cable, a tension leg platform is towed to the position close to the mooring steel cable, a steel strand is lowered by a deepwater installation workboat, and the mooring steel cable is fished; three groups of lifting devices are arranged on a deck of the tension leg platform, and the mooring steel cable and the lifting devices are connected through a traction steel cable penetrating through a cable stopper; the lifting device is started to recover the traction steel cable, and after the traction steel cable reaches the set tension, the lifting device is self-locked; a platform ballast pump is started to carry out ballasting, after ballasting is completed, the tension of the lifting device is reduced, lifting is carried out again, the mooring steel cable is connected back to the cable stopper through the cyclic operation of lifting, self-locking and ballasting, and the cable stopper is locked; and the platform load discharging pump is started for load discharging until the tension of the mooring steel cable and the buoyancy of the tension leg platform reach a balanced state, and the device has the advantage of being convenient to install.

The application relates to the technical field of offshore wind power generation, in particular to a buoyancy adjusting system and method suitable for a tension leg platform. The system comprises a tension leg platform and a plurality of buoyancy adjusting components. The buoyancy adjusting component comprises a rigid outer wall, a flexible inner wall, a plurality of bionic contraction units, a flow guide unit, a central control unit and an inclination measuring unit. The flexible inner wall is nested on the inner side of the rigid outer wall, and a water cabin is formed inside. The inclination measuring unit is used for detecting the inclination angle of the water cabin corresponding direction. The plurality of bionic contraction units are arranged inside the water cabin and are used for being contracted or expanded under the control of the central control unit. The central control unit is used for controlling the water filling state or the water discharging state of the flow guide unit and the contraction state or the expansion state of the bionic contraction unit according to the inclination angle. The above technical scheme can improve the response speed and the adjusting precision of the tension leg platform buoyancy adjustment.

The invention belongs to the field of offshore wind power, and discloses an offshore wind power tension leg platform suction barrel anchoring recoverable device and an anchoring method, and the offshore wind power tension leg platform suction barrel anchoring recoverable device comprises a suction barrel, a stirring device, a telescopic barrel device, a soil digging device, a soil digging movable device, a mud suction device, an anchor control device and a grouting device. Safe anchoring of the tendons of the tension legs in the operation period is guaranteed, and recycling and reusing of the suction barrels after installation and anchoring can be achieved. Meanwhile, grouting is creatively designed on the seabed, the anchoring strength is further improved through grouting reinforcement, finally, the offshore operation cost is remarkably reduced, and the engineering efficiency and safety are improved.

The invention discloses a pool test method for simulating the installation operation of a tension leg floating fan. The pool test method for simulating the installation operation of the tension leg floating fan can be applied to the basic design stage and the detailed design stage of the floating fan. A current tension leg floating fan installation operation simulation test method generally has the limitations of inaccurate adjustment, uncontrollable response, difficulty in reproducing an actual nonlinear installation process and the like, and when a time-varying effect and a dynamic posture adjusting behavior in a tension applying process are not considered, the time-varying effect is not accurate, and the dynamic posture adjusting behavior is not accurate. Continuous and adjustable tension is applied to the tension leg mounting cable through the motor driving system, the floating state of the platform is actively adjusted and continuously adjusted according to the posture change condition of the floating body in the mounting process simulation, the operation process reproduction under multiple working conditions is realized, and the device is coupled with a load simulation device and an environment simulation device. The system can comprehensively reflect mechanical response and operation behaviors under complex boundary conditions in actual engineering.

The tension platform structure for the rhombic independent liquid tank of the transport ship comprises an annular platform plate, the inner edge of the annular platform plate is used for being connected with a circular panel, and the outer edge of the annular platform plate is used for being connected with a liquid tank shell and a middle longitudinal bulkhead; the transverse frames and the vertical trusses are crossed to form a grid framework, and the grid framework is fixed to the annular platform plate in a penetrating mode. The inner edge of the annular platform plate is connected with the circular panel, the outer edge of the annular platform plate is connected with the liquid tank shell and the middle longitudinal bulkhead, and the grid framework formed by crossing the transverse frames and the vertical trusses penetrates through and is fixed to the annular platform plate, so that when the tension platform structure bears loads, the characteristics of the circular structure can be fully utilized, and the load bearing capacity is improved. Force is effectively transmitted in an annular path in a tension mode, the stress state of the tension platform structure is improved, and the buckling problem caused by stress is effectively avoided.

The utility model discloses a suction pile anchoring foundation of a tension leg platform, which relates to the technical field of ocean engineering and comprises a base structure and a mud-entering steel structure. The base structure is fixed to the top of the mud entering steel structure. The base structure is of a double-wall cylindrical structure, a ballast tank is arranged in the base structure, and a ballast system is arranged in the ballast tank; a drainage pipeline is further arranged in the base structure and communicates with the interior of the mud inlet steel structure and the water suction pump. A lug plate structure is arranged on the side wall of the base structure; the mud entering steel structure is of a single-layer wall cylindrical structure, and the cylindrical opening direction of the mud entering steel structure is opposite to the cylindrical opening direction of the base structure; and a to-be-mounted counterweight is placed in the upper opening structure of the base structure. The technical problem that the axial pulling resistance capacity of a traditional suction pile anchoring foundation is limited by a suction barrel structure type, an installation mode and soil conditions, and the traditional suction pile anchoring foundation is not suitable for a tension leg type floating platform including a floating wind power platform is solved.

The invention provides a quasi-zero-stiffness tension leg type floating foundation and a power generation platform. The quasi-zero-stiffness tension leg type floating foundation comprises a floating foundation body and tension tendons. The floating foundation comprises an annular water tank, a tower and multiple sets of zero-rigidity connecting assemblies. The zero-rigidity connecting assembly comprises a flexible straight beam and a flexible oblique beam, and the flexible straight beam is located above the flexible oblique beam. The flexible straight beam is a positive stiffness beam; when the displacement of the flexible cant beam is in a first displacement interval, the flexible cant beam has positive rigidity; and when the displacement of the flexible cant beam is in a second displacement interval, the flexible cant beam has negative stiffness. The zero-stiffness connecting assembly composed of the flexible straight beam and the flexible oblique beam is arranged to connect the annular water tank and the tower, the zero-stiffness connecting assembly enters a quasi-zero-stiffness state under the action of low-frequency waves, high flexibility is achieved, flexible low-frequency deformation is achieved, and vibration is effectively buffered and isolated.