An adjustable deck support device for floating installation on offshore platforms

Abstract

The application discloses an adjustable deck support device for offshore platform float-over installation, and belongs to the technical field of offshore platform installation, which comprises a support base plate, a support platform, a load-bearing hydraulic cylinder, a universal butt joint mechanism, a butt joint device and a three-degree-of-freedom adjusting balance cylinder group, a through hole is arranged in the center of the support platform, and the load-bearing hydraulic cylinder is arranged in the center of the support base plate in correspondence with the through hole; the universal butt joint mechanism is hingedly connected to the top end of the hydraulic rod of the load-bearing hydraulic cylinder in correspondence with the through hole, and the universal butt joint mechanism extends out of the support platform through the through hole; the butt joint device is arranged in correspondence with the spherical hinge connection between the top end of the support platform and the universal butt joint mechanism; the three-degree-of-freedom adjusting balance cylinder group comprises multiple groups which are uniformly distributed along the circumference of the load-bearing hydraulic cylinder, and the support platform and the structure thereon are allowed to rotate and adjust at multiple angles in space. The application can support large-weight upper blocks, has wave compensation capacity, increases the butt joint efficiency of float-over installation, improves the working efficiency of load transfer, and reduces the offshore operation time.

Description

Technical Field

[0001] This invention relates to the field of marine platform installation technology, and in particular to an adjustable deck support device for floating installation of offshore platforms. Background Technology

[0002] As offshore platforms become increasingly heavier, the lifting capacity of floating cranes is gradually being replaced by the float-over method due to its inability to handle the weight of the superstructure. The general process of float-over installation includes steps such as entering the vessel, preparing for loading, load transfer, continued loading, and retraction. The most crucial step is the load transfer, a multi-body coupled motion process. When the load reaches a certain level, the superstructure separates from the deck support system, and its weight is then supported by the jacket structure. Previously, during the docking process, the barge and superstructure would sway due to waves and other environmental factors. Traditional deck supports (DSUs) rigidly fixed the superstructure to the deck, requiring docking only via ballast water systems or tides, increasing the difficulty of float-over docking and extending the offshore operation time. Furthermore, the load-bearing capacity of motion compensation devices cannot keep pace with the development of current offshore platforms, potentially increasing the risks of offshore operations. Summary of the Invention

[0003] Technical Problem Solved: To address the technical problems existing in the installation process of offshore platforms in the prior art, this invention provides an adjustable deck support device for the floating installation of offshore platforms. The spherical joint rotating inside the docking device bears the load of the upper module. The position and attitude of the upper module are adjusted by the support platform and the docking device controlled by the oblique telescopic cylinder and the vertical adjustment hydraulic cylinder. This deck support device can support heavy modules while also having a certain wave compensation capability, increasing the efficiency of floating installation and docking and reducing the time spent at sea.

[0004] Technical solution: The present invention provides an adjustable deck support device for floating installation on offshore platforms, the deck support device comprising:

[0005] Support substrate;

[0006] A support platform is disposed above a support substrate, and a through hole is provided in the center of the support platform;

[0007] A load-bearing hydraulic cylinder is correspondingly disposed at the center of the support base plate;

[0008] The universal docking mechanism is hinged to the top of the hydraulic rod of the load-bearing hydraulic cylinder, and extends through the through hole to the support platform.

[0009] A docking device is correspondingly installed at the top of the support platform, and the center of the docking device is ball-jointed with the universal docking mechanism.

[0010] The three-degree-of-freedom adjustable balance cylinder assembly includes multiple sets correspondingly arranged between the support base plate and the support platform and evenly distributed along the circumference of the load-bearing hydraulic cylinder, allowing the support platform and its structure to rotate and adjust at multiple angles in space.

[0011] Preferably, the docking device includes an upper docking device and a lower docking device arranged vertically and vertically, and the upper docking device and the lower docking device are fixedly connected by a plurality of fixed connecting parts arranged circumferentially.

[0012] Preferably, the universal docking mechanism includes a steel sleeve fixing plate at the center of the connection between the upper docking device and the lower docking device. The steel sleeve fixing plate has a spherical steel sleeve with an opening facing downward at the center. A spherical butt joint is rotatably connected inside the spherical steel sleeve, and the spherical butt joint is fixedly connected to the hydraulic rod of the load-bearing hydraulic cylinder through a docking connecting rod.

[0013] Preferably, a rubber pad for cushioning deformation is provided between the lower docking device and the support platform, and a circular hole for the spherical docking joint to pass through is provided in the center of the rubber pad.

[0014] Preferably, a circular pressure sensor is provided between the connecting rod and the hydraulic rod of the load-bearing hydraulic cylinder.

[0015] Preferably, three vertical support hydraulic cylinders are evenly distributed circumferentially near the central through hole of the support platform.

[0016] The three-degree-of-freedom adjustable balance cylinder group includes three oblique telescopic cylinders and three vertical adjusting hydraulic cylinders evenly distributed along the circumference of the load-bearing hydraulic cylinder.

[0017] The vertical support hydraulic cylinder and the vertical adjustment hydraulic cylinder are fixed on the support base plate, and the top of their hydraulic rods are hinged to the support platform through the upper ball chain; the oblique telescopic cylinders are respectively hinged to the support platform and the support base plate through the upper ball chain and the lower ball chain.

[0018] Preferably, three vertical adjusting hydraulic cylinders and three oblique telescopic cylinders are spaced apart along the circumference of the load-bearing hydraulic cylinders. The hydraulic rods of the vertical adjusting hydraulic cylinders and the oblique telescopic cylinders form six evenly distributed hinge points on the bottom surface of the support platform with the same diameter, and the angle difference of each hinge point is 60°.

[0019] The lower hinge points of the three inclined telescopic cylinders and the lower fixing points of the three vertical support hydraulic cylinders are on the same diameter, and the angle difference between the lower hinge points of the three inclined telescopic cylinders is 120°.

[0020] Preferably, the angle between the line connecting the upper and lower hinge points of the inclined telescopic cylinder and the horizontal direction is 60°.

[0021] Preferably, each hydraulic cylinder of the three-degree-of-freedom adjustable balance cylinder group is provided with a displacement sensor at the upper end of the hydraulic rod, and the displacement sensor is used to monitor the displacement distance of each hydraulic rod;

[0022] Pressure sensors for monitoring the force on each hydraulic cylinder are installed at the docking points between the vertical support hydraulic cylinder, the vertical adjustment hydraulic cylinder, and the inclined telescopic cylinder and the support platform.

[0023] A position sensor is installed on the support base plate. The position sensor is used to detect the required lifting height of the hydraulic cylinder and the posture that needs to be compensated. The computer feeds back the data to the load-bearing hydraulic cylinder and the three-degree-of-freedom adjustment cylinder group to adjust the position of the support platform. The angle of the structure on it is adjusted by the docking device. The displacement sensor receives data from the pressure sensor and the position sensor and provides accurate feedback on the control results.

[0024] Preferably, the load-bearing hydraulic cylinder, the vertical support hydraulic cylinder, and the three-degree-of-freedom adjustable balance cylinder group all include a hydraulic cylinder body, a hydraulic rod, and a servo valve that provides driving force to the hydraulic rod.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The deck support device of the present invention can support heavy upper modules, has wave compensation capability, increases the efficiency of floating installation and docking, improves the efficiency of load transfer, and reduces the time spent at sea.

[0027] 2. The spherical joint rotating inside the docking device of this universal docking mechanism bears the load of the upper module. The oblique telescopic cylinder and the vertical adjusting hydraulic cylinder control the support platform and docking device to adjust the position and posture of the upper module. The upper module is controlled and balanced at multiple angles by docking with the docking device through the detachable spherical joint. This greatly reduces the stress imbalance that may occur on the platform due to the low accuracy of the hydraulic cylinder lifting or the failure of the hydraulic cylinders to coordinate, thereby reducing the risk of damage to the deck support device.

[0028] 3. By controlling the load-bearing hydraulic cylinders to bear the weight of the upper module through hydraulic servo valves and the three-degree-of-freedom adjustable balance cylinder group, the three-degree-of-freedom motion control of the support platform and docking device is realized. Combined with the information collected by pressure sensors and posture sensors and fed back to the host computer for calculation, it can achieve safer wave compensation for the upper module when bearing heavy upper modules, while the movement of the barge at sea, improve operation efficiency, reduce the time at sea, expand the floating operation window, and adapt to more complex sea conditions.

[0029] 4. The vertical support hydraulic cylinder plays an auxiliary role in supporting the upper module. The angle between the inclined telescopic cylinder and the horizontal plane is 60°. Its combination with the vertical adjustment hydraulic cylinder can withstand heavy loads and adapt to more sea conditions. In addition to being hinged to the support platform and support base plate with ball chains, the deck support device is also fixed to the support base plate, which makes its overall structure more stable and reduces the difficulty of control.

[0030] 5. The universal docking mechanism adopts a detachable spherical joint, which facilitates maintenance and installation, reduces manufacturing costs, and can be better adapted to a three-degree-of-freedom adjustable balance cylinder group. It can support the upper block at various angles to adapt to more sea conditions. The spherical steel sleeve protects the docking device, extends its service life, and facilitates disassembly and maintenance.

[0031] 6. The position, displacement, and pressure of the deck support device are accurately monitored by attitude sensors, displacement sensors, and pressure sensors. The monitoring data is transmitted to the computer, and after calculation, the data is fed back to the sensors to realize real-time feedback adjustment of the upper module.

[0032] The present invention also has other beneficial effects, which are described in the embodiments section of the specification and will not be repeated here. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the deck support device according to an embodiment of the present invention;

[0034] Figure 2 for Figure 1 Front view of the mid-deck support structure;

[0035] Figure 3 for Figure 1 Top view of the mid-deck support structure.

[0036] Reference numerals: 100, Deck support device; 1, Upper docking device; 2, Lower docking device; 3, Fixed connector; 4, Rubber pad; 5, Support platform; 6, Load-bearing hydraulic cylinder; 7, Vertical adjustment hydraulic cylinder; 8, Angled telescopic cylinder; 9, Vertical support hydraulic cylinder; 10, Lower ball chain; 11, Position sensor; 12, Support base plate; 13, Displacement sensor; 14, Steel sleeve fixing plate; 15, Spherical steel sleeve; 16, Spherical joint; 17, Pressure sensor; 18, Docking rod; 19, Upper ball chain. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-3The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0038] like Figures 1-3 As shown, this invention discloses an adjustable deck support device for floating installation on an offshore platform. The deck support device 100 includes a support base plate 12, a support platform 5, a load-bearing hydraulic cylinder 6, a universal docking mechanism, a docking device, and a three-degree-of-freedom adjustable balance cylinder assembly. The support platform 5 is positioned above the support base plate 12, and a through hole is provided in the center of the support platform 5 to allow the universal docking mechanism to pass through. The load-bearing hydraulic cylinder 6 is positioned in the center of the support base plate 12. The universal docking mechanism is hinged to the top of the hydraulic rod of the load-bearing hydraulic cylinder 6, and extends out of the support platform 5 through the through hole. The docking device is positioned at the top of the support platform 5, and its center is ball-jointed with the universal docking mechanism, allowing the docking device to be adjusted in angle via the universal docking mechanism. The three-degree-of-freedom adjustable balance cylinder assembly includes multiple sets positioned between the support base plate 12 and the support platform 5, and evenly distributed along the circumference of the load-bearing hydraulic cylinder 6, allowing the support platform 5 and its structure to rotate and adjust at multiple angles in space. The deck support device of the present invention can support heavy upper modules, has wave compensation capability, increases the efficiency of floating installation and docking, improves the efficiency of load transfer, and reduces the time spent at sea.

[0039] like Figures 1-2 As shown, the docking device includes an upper docking device 1 and a lower docking device 2 arranged vertically. The upper docking device 1 and the lower docking device 2 are fixedly connected by multiple fixed connecting parts 3 arranged circumferentially. The fixed connecting parts 3 can be fixed by fixing screws to achieve the fixed connection between the upper docking device 1 and the lower docking device 2. The universal docking mechanism includes a steel sleeve fixing plate 14 arranged in the center of the connection between the upper docking device 1 and the lower docking device 2. A spherical steel sleeve 15 with an opening facing downward is arranged in the center of the steel sleeve fixing plate 14. A spherical butt joint 16 is rotatably connected inside the spherical steel sleeve 15, and the spherical butt joint 16 is fixedly connected to the hydraulic rod of the load-bearing hydraulic cylinder 6 through a docking connecting rod 18. The spherical joint 16 rotating inside the docking unit of the universal docking mechanism bears the load of the upper module. The detachable spherical joint 16 facilitates maintenance and installation, and reduces manufacturing costs. The spherical joint 16 can be well adapted to the three-degree-of-freedom adjustable balance cylinder group and can bear the upper module at various angles to adapt to more sea conditions. The spherical steel sleeve 15 protects the docking unit, extends its service life, and facilitates disassembly and maintenance.

[0040] In one specific embodiment, the hydraulic rod of the load-bearing hydraulic cylinder 6 is connected to the spherical connector 16 via a docking link 18. The docking link 18 has a 90° opposing quarter circle that connects to a groove inside the hydraulic rod, allowing the spherical connector 16 to be detachably connected for easy maintenance and replacement. The spherical connector 16 is connected to the spherical cylinder sleeve of the docking device. Space is provided between the support platform 5 and the spherical connector 16 to facilitate rotation within the docking device. Before connecting the spherical steel sleeve 15 inside the docking device to the spherical connector 16, lubricating grease is applied. The spherical steel sleeve 15 is fixedly connected to the connection point of the upper docking device 1 and the lower docking device 2 via a steel sleeve fixing plate to prevent the spherical connector 16 from shifting due to excessive friction during rotation. The spherical steel sleeve 15 serves as an isolation device between the spherical connector 16 and the docking device, not only making the docking operation more precise but also extending the service life of the spherical connector 16 and the docking device, offering the advantages of convenient maintenance and replacement.

[0041] like Figures 1-2 As shown, a rubber pad 4 for buffering deformation is provided between the lower docking device 2 and the support platform 5. A circular hole for the spherical docking joint 16 to pass through is provided in the center of the rubber pad 4. The rubber pad 4 transmits part of the pressure of the upper block borne by the docking device to the support platform 5, and also serves as a buffer between the support platform 5 and the docking device when the deck support device rotates.

[0042] like Figures 1-2 As shown, three vertical support hydraulic cylinders 9 are evenly distributed circumferentially near the central through hole of the support platform 5. The bottom ends of the three vertical support hydraulic cylinders 9 are fixedly connected to the support base plate 12, and the top ends of their hydraulic rods are hinged to the support platform 5. The three vertical support hydraulic cylinders 9 play a supporting role on the outer periphery of the central through hole of the support platform 5, preventing uneven force on the outer and inner rings of the support platform 5 from causing damage to the deck support device.

[0043] like Figures 1-2 As shown, the three-degree-of-freedom adjustable balance cylinder assembly includes three inclined telescopic cylinders 8 and three vertical adjusting hydraulic cylinders 7 evenly distributed along the circumference of the load-bearing hydraulic cylinder 6. The vertical support hydraulic cylinder 9 and the vertical adjusting hydraulic cylinder 7 are fixed on the support base plate 12, and their hydraulic rod tops are hinged to the support platform 5 via the upper ball chain 19. The inclined telescopic cylinders 8 are hinged to the support platform 5 and the support base plate 12 via the upper ball chain 19 and the lower ball chain 10, respectively. The inclined telescopic cylinders 8 and the vertical adjusting hydraulic cylinders 7 control the support platform 5 and the docking device to adjust the position and posture of the upper block. The upper block is controlled and balanced at multiple angles by docking with the docking device through the detachable ball joint 16. This greatly reduces the stress imbalance that may occur on the platform supporting the upper block due to the low accuracy of the hydraulic cylinder lifting or the mismatch of the hydraulic cylinders, thereby reducing the risk of damage to the deck support device.

[0044] like Figure 2As shown, three vertical adjusting hydraulic cylinders 7 and three oblique telescopic cylinders 8 are spaced apart along the circumference of the load-bearing hydraulic cylinder 6. The hydraulic rods of the vertical adjusting hydraulic cylinders 7 and the oblique telescopic cylinders 8 form six evenly distributed hinge points on the bottom surface of the support platform 5, with an angle difference of 60° between each hinge point. The lower hinge points of the three oblique telescopic cylinders 8 and the lower fixing points of the three vertical support hydraulic cylinders 9 are on the same diameter, and the angle difference between the lower hinge points of the three oblique telescopic cylinders 8 is 120°. The angle between the line connecting the upper and lower hinge points of the oblique telescopic cylinders 8 and the horizontal direction is 60°. The vertical support hydraulic cylinders 9 serve as auxiliary supports for the upper module. The angle between the oblique telescopic cylinders 8 and the horizontal plane is 60°. The combination of the vertical adjusting hydraulic cylinders 7 and the vertical adjusting hydraulic cylinders 7 can withstand heavy loads and adapt to more sea conditions. In addition to being hinged to the support platform 5 and the support base plate 12 by ball chains, the deck support device is also fixed to the support base plate 12, making its overall structure more stable and reducing the difficulty of control.

[0045] like Figures 1-3 As shown, annular pressure sensors 17 are correspondingly installed between the connecting rod 18 and the hydraulic rod of the load-bearing hydraulic cylinder 6. Pressure sensors 17 for monitoring the force on each hydraulic cylinder are installed at the docking points of the vertical support hydraulic cylinder 9, the vertical adjustment hydraulic cylinder 7, and the oblique telescopic cylinder 8 with the support platform 5. Each hydraulic cylinder of the three-degree-of-freedom adjustable balance cylinder group has a displacement sensor 13 installed at the upper end of its hydraulic rod. The displacement sensor 13 is used to monitor the displacement distance of each hydraulic rod. A posture sensor 11 is installed on the support base plate 12. The posture sensor 11 is used to detect the required lifting height of the hydraulic cylinder and the posture that needs to be compensated. The computer feeds back the data to the load-bearing hydraulic cylinder 6 and the three-degree-of-freedom adjustable cylinder group to adjust the posture of the support platform 5. The angle adjustment of the structure on it is completed with the help of the docking device. The displacement sensor 13 receives the data from the pressure sensor 17 and the posture sensor 11 and provides precise feedback on the control results.

[0046] The load-bearing hydraulic cylinder 6, the vertical support hydraulic cylinder 9, and the three-degree-of-freedom adjustable balance cylinder assembly of this invention all include a hydraulic cylinder body, a hydraulic rod, and a servo valve that provides driving force to the hydraulic rod. The size of the load-bearing hydraulic cylinder 6 is larger than that of the vertical support hydraulic cylinder 9 and the three-degree-of-freedom adjustable balance cylinder assembly. The cross-sectional area of ​​the piston rod of the load-bearing hydraulic cylinder 6 is larger than that of the vertical support hydraulic cylinder 9 and the three-degree-of-freedom adjustable balance cylinder assembly, but its piston rod stroke is slightly shorter than that of the piston rod of the three-degree-of-freedom adjustable balance cylinder assembly. By controlling the load-bearing hydraulic cylinder 6 to bear the weight of the upper module and the three-degree-of-freedom adjustable balance cylinder assembly through the hydraulic servo valve, the three-degree-of-freedom motion control of the support platform 5 and the docking device is realized. Combined with the information collected by the pressure sensor 17 and the posture sensor 11 and fed back to the upper computer for calculation, it is possible to achieve safer wave compensation for the upper module caused by the movement of the barge at sea while bearing a heavy upper module, thereby improving operation efficiency, reducing the time spent at sea, expanding the floating operation window, and adapting to more complex sea conditions.

[0047] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An adjustable deck support arrangement for float-over installation of an offshore platform, characterised in that, The deck support device (100) comprises: a support base plate (12); a support platform (5) arranged above the support base plate (12) and provided with a through hole in the center of the support platform (5); a load-bearing hydraulic cylinder (6) arranged above the center of the support base plate (12); a universal docking mechanism connected to the top end of the hydraulic rod of the load-bearing hydraulic cylinder (6) and extending out of the support platform (5) through the through hole, wherein the universal docking mechanism comprises a steel sleeve fixing plate (14) arranged in the center of the connection between the upper docking device (1) and the lower docking device (2), a spherical steel sleeve (15) with an opening downward arranged in the center of the steel sleeve fixing plate (14), and a spherical docking joint (16) rotatably connected in the spherical steel sleeve (15) and fixedly connected to the hydraulic rod of the load-bearing hydraulic cylinder (6) through a docking connecting rod (18); a docking device arranged at the top end of the support platform (5) and hinged to the universal docking mechanism at the center of the docking device, wherein the docking device comprises the upper docking device (1) and the lower docking device (2) arranged above and below, and the upper docking device (1) and the lower docking device (2) are fixedly connected through a plurality of fixed connecting members (3) arranged in the circumferential direction thereof; a three-degree-of-freedom adjusting and balancing cylinder group arranged between the support base plate (12) and the support platform (5) and uniformly distributed along the circumference of the load-bearing hydraulic cylinder (6), allowing the support platform (5) and the structure thereon to be adjusted and rotated at multiple angles in space; wherein three vertical support hydraulic cylinders (9) are uniformly distributed along the circumference near the central through hole of the support platform (5), the three-degree-of-freedom adjusting and balancing cylinder group comprises three sets of oblique telescopic cylinders (8) and vertical adjusting hydraulic cylinders (7) uniformly distributed along the circumference of the load-bearing hydraulic cylinder (6), the vertical support hydraulic cylinders (9) and the vertical adjusting hydraulic cylinders (7) are fixed on the support base plate (12), and the top ends of the hydraulic rods thereof are hinged to the support platform (5) through upper spherical chains (19), the oblique telescopic cylinders (8) are respectively hinged to the support platform (5) and the support base plate (12) through upper spherical chains (19) and lower spherical chains (10); the three vertical adjusting hydraulic cylinders (7) and the three oblique telescopic cylinders (8) are arranged along the circumference of the load-bearing hydraulic cylinder (6) at intervals, the hydraulic rods of the vertical adjusting hydraulic cylinders (7) and the oblique telescopic cylinders (8) form six evenly distributed hinge points on the same diameter on the bottom surface of the support platform (5), and the angle difference of each hinge point is 60°, the lower end hinge points of the three oblique telescopic cylinders (8) and the lower end fixed points of the three vertical support hydraulic cylinders (9) are on the same diameter, and the angle difference of the lower end hinge points of the three oblique telescopic cylinders (8) is 120°, and the angle between the upper and lower hinge points of the oblique telescopic cylinder (8) and the horizontal direction is 60°.

2. An adjustable deck support arrangement for float-over installation of an offshore platform as claimed in claim 1, characterised in that, The lower adapter (2) is provided with a rubber pad (4) for buffering deformation between the lower adapter (2) and the support platform (5), and the rubber pad (4) is provided with a circular hole in the center for passing through the spherical adapter (16).

3. An adjustable deck support apparatus for float-over installation of an offshore platform as defined in claim 1, wherein, The adapter connecting rod (18) is correspondingly provided with a circular pressure sensor (17) between the adapter connecting rod (18) and the hydraulic rod of the bearing hydraulic cylinder (6).

4. An adjustable deck support apparatus for float-over installation of an offshore platform as defined in claim 1, wherein, The three-degree-of-freedom adjusting balance cylinder group is provided with a displacement sensor (13) at the upper end of the hydraulic rod of each hydraulic cylinder, and the displacement sensor (13) is used for monitoring the displacement distance of each hydraulic rod. The vertical supporting hydraulic cylinder (9), the vertical adjusting hydraulic cylinder (7) and the inclined telescopic cylinder (8) are provided with pressure sensors (17) at the adapter positions of the vertical supporting hydraulic cylinder (9), the vertical adjusting hydraulic cylinder (7) and the inclined telescopic cylinder (8) and the support platform (5) for monitoring the stress conditions of the respective hydraulic cylinders. The support base plate (12) is provided with a pose sensor (11), the pose sensor (11) is used for detecting the height required to be lifted by the hydraulic cylinder and the attitude required to be compensated, and the computer feeds back the height required to be lifted by the hydraulic cylinder and the attitude required to be compensated to the bearing hydraulic cylinder (6) and the three-degree-of-freedom adjusting cylinder group to adjust the pose of the support platform (5), and the adapter is used for adjusting the structure angle of the support platform (5); the displacement sensor (13) receives the data feedback by the computer according to the pressure sensor (17) and the pose sensor (11) to accurately feedback the control result.

5. An adjustable deck support arrangement for float-over installation of an offshore platform as claimed in claim 4, characterised in that, The bearing hydraulic cylinder (6), the vertical supporting hydraulic cylinder (9) and the three-degree-of-freedom adjusting balance cylinder group all include a hydraulic cylinder body, a hydraulic rod and a servo valve for providing driving force for the hydraulic rod.

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