Adjustable deck supporting device for floating mounting of maritime work platform

Abstract

The invention discloses an adjustable deck supporting device for floating mounting of a maritime work platform, and belongs to the technical field of ocean platform mounting, the adjustable deck supporting device comprises a supporting base plate, a supporting platform, a bearing hydraulic cylinder, a universal butt joint mechanism, a butt joint device and a three-degree-of-freedom adjusting balance cylinder set, and a via hole is formed in the center of the supporting platform; the bearing hydraulic cylinder is correspondingly arranged in the center of the supporting base plate. The universal butt joint mechanism is correspondingly hinged to the top end of a hydraulic rod of the bearing hydraulic cylinder, and the universal butt joint mechanism penetrates through the via hole and extends out of the supporting platform; the butt joint device is correspondingly arranged at the top end of the supporting platform and is spherically hinged to the universal butt joint mechanism; the three-degree-of-freedom adjusting balance cylinder sets are evenly distributed in the circumferential direction of the bearing hydraulic cylinder, and the supporting platform and the structure on the supporting platform are allowed to be adjusted in a space in a multi-angle rotating mode. The device can bear upper modules with large weight, has the wave compensation capability, improves the floating mounting and butting efficiency, improves the working efficiency of load transfer, and reduces the offshore operation time.

Description

Technical Field

[0001] The present invention relates to the technical field of marine platform installation, and in particular to an adjustable deck supporting device for floating installation of an offshore platform. Background Art

[0002] As the weight of offshore platforms increases, the lifting capacity of the floating crane method is gradually replaced because it cannot meet the weight of the upper module. It is replaced by the floating installation method. The general process of floating installation includes entering the ship, preparing for loading, load transfer, continuing loading, and leaving the ship. The most important step is the load transfer step. Load transfer is a multi-body coupled motion process. When the load transfer reaches a certain level, the upper module will be separated from the deck support device, and the weight of the upper module will be borne by the jacket. Before this, the barge and the upper module will shake with environmental factors such as waves during the docking installation process. The traditional deck support unit (DSU) rigidly fixes the upper module on the deck and can only rely on the ballast water system or tide for docking, which increases the docking difficulty of floating installation and increases the time of offshore operations. In addition, the load-bearing capacity of the device with motion compensation capability cannot meet the current development speed of offshore platforms, which may increase the degree of construction danger of offshore operations. Summary of the invention

[0003] Technical problems to be solved: In view of the technical problems existing in the installation process of offshore platforms in the prior art, the present invention provides an adjustable deck support device for floating installation of offshore platforms, in which the spherical docking joint rotating in the docking device bears the load of the upper assembly, and the support platform and the docking device are controlled by the oblique telescopic cylinder and the vertical adjustment hydraulic cylinder to adjust the position of the upper assembly. The deck support device can bear large-weight modules while also having a certain wave compensation capability, thereby increasing the efficiency of floating installation docking and reducing offshore operation time.

[0004] Technical solution: The adjustable deck support device for floating installation of an offshore platform described in the present invention comprises: A supporting substrate; A supporting platform, the supporting platform is correspondingly arranged above the supporting substrate, and a through hole is arranged in the center of the supporting platform; A load-bearing hydraulic cylinder, the load-bearing hydraulic cylinder being correspondingly arranged in the center of the supporting base plate; A universal docking mechanism, the universal docking mechanism is correspondingly hinged to the top end of the hydraulic rod of the load-bearing hydraulic cylinder, and the universal docking mechanism extends out of the support platform through the through hole; A docking device, which is correspondingly arranged at the top of the supporting platform, and the center of the docking device is ball-jointed with the universal docking mechanism; The three-degree-of-freedom adjustable balancing cylinder group includes a plurality of groups which are arranged correspondingly between the supporting base plate and the supporting platform and are evenly distributed along the circumference of the load-bearing hydraulic cylinder, allowing the supporting platform and the structure thereon to be rotated and adjusted at multiple angles in space.

[0005] Preferably, the docking connector comprises an upper docking connector and a lower docking connector which are arranged correspondingly from top to bottom, and the upper docking connector and the lower docking connector are fixedly connected via a plurality of fixed connectors which are arranged in their circumferential direction.

[0006] Preferably, the universal docking mechanism includes a steel sleeve fixing plate arranged in the center of the connection between the upper docking device and the lower docking device, a spherical steel sleeve with an opening facing downward is arranged in the center of the steel sleeve fixing plate, a spherical docking joint is rotatably connected in the spherical steel sleeve, and the spherical docking joint is fixedly connected to the hydraulic rod of the load-bearing hydraulic cylinder through a docking connecting rod.

[0007] Preferably, a rubber pad for buffering deformation is provided between the lower docking device and the supporting platform, and a circular hole for the spherical docking joint to pass through is provided in the center of the rubber pad.

[0008] Preferably, a circular pressure sensor is correspondingly provided between the docking connecting rod and the hydraulic rod of the load-bearing hydraulic cylinder.

[0009] Preferably, three vertical support hydraulic cylinders are evenly distributed in the circumferential direction close to the central through hole of the support platform; The three-degree-of-freedom adjustment balance cylinder group includes three oblique telescopic cylinders and three vertical adjustment hydraulic cylinders evenly distributed along the circumference of the load-bearing hydraulic cylinder; The vertical support hydraulic cylinder and the vertical adjustment hydraulic cylinder are fixed on the support base plate, and the top ends of their hydraulic rods are hinged to the support platform through the upper ball chain; the oblique telescopic cylinder is hinged to the support platform and the support base plate through the upper ball chain and the lower ball chain respectively.

[0010] Preferably, three vertical adjustment hydraulic cylinders and three oblique telescopic cylinders are arranged at intervals along the circumference of the load-bearing hydraulic cylinder, and the hydraulic rods of the vertical adjustment hydraulic cylinder and the oblique telescopic cylinder form six evenly distributed hinge points on the same diameter on the bottom surface of the support platform, and the angle difference of each hinge point is 60°; The lower end hinge points of the three oblique telescopic cylinders and the lower end fixing points of the three vertical support hydraulic cylinders are on the same diameter, and the angle difference of the lower end hinge points of the three oblique telescopic cylinders is 120°.

[0011] Preferably, the angle between the line connecting the upper and lower hinge points of the oblique telescopic cylinder and the horizontal direction is 60°.

[0012] Preferably, each hydraulic cylinder of the three-degree-of-freedom adjustment balancing 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; Pressure sensors for monitoring the stress conditions of each hydraulic cylinder are provided at the joints between the vertical support hydraulic cylinder, the vertical adjustment hydraulic cylinder and the oblique telescopic cylinder and the support platform; A posture sensor is arranged on the support base plate, and is used to detect the height that the hydraulic cylinder needs to lift and the posture that needs to be compensated, and is fed back by a computer to the load-bearing hydraulic cylinder and the three-degree-of-freedom adjustment cylinder group to adjust the posture of the support platform, and the angle adjustment of the structure thereon is completed with the help of a docking device; the displacement sensor receives the data fed back by the computer from the pressure sensor and the posture sensor to provide accurate feedback on the control results.

[0013] Preferably, the load-bearing hydraulic cylinder, the vertical support hydraulic cylinder and the three-degree-of-freedom adjustment balancing cylinder group all include a hydraulic cylinder body, a hydraulic rod and a servo valve that provides driving force for the hydraulic rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The deck support device of the present invention can bear heavy upper modules, has wave compensation capability, increases floating installation docking efficiency, improves load transfer efficiency, and reduces offshore operation time.

[0015] 2. The spherical docking joint of the universal docking mechanism rotates in the docking device to bear the load of the upper assembly. The oblique telescopic cylinder and the vertical adjustment hydraulic cylinder control the support platform and the docking device to adjust the posture of the upper assembly. The multi-angle control balance of the upper assembly is achieved through the docking of the detachable spherical docking joint with the docking device, which greatly reduces the stress imbalance that may be caused by the platform bearing the upper assembly due to the low lifting accuracy of the hydraulic cylinder or the mismatch of the hydraulic cylinders, thereby reducing the risk of damage to the deck support device.

[0016] 3. The load-bearing hydraulic cylinders are controlled by hydraulic servo valves to bear the weight of the upper assembly and the three-degree-of-freedom adjustment balance cylinder group to achieve three-degree-of-freedom motion control of the support platform and the docking device. The information collected by the pressure sensor and the posture sensor is fed back to the upper computer for calculation. While bearing the heavy upper assembly, the movement of the barge at sea can be compensated for the upper assembly in a safer way, thereby improving operating efficiency, reducing offshore operating time, expanding the window period for floating operations, and adapting to more complex sea conditions.

[0017] 4. The vertical support hydraulic cylinder plays the role of auxiliary support for the upper block. The angle between the oblique telescopic cylinder and the horizontal plane is 60°. Its combination with the vertical adjustment hydraulic cylinder can withstand large weight loads and can adapt to more sea conditions. In addition to being hinged with the support platform and the support base plate ball chain, the deck support device is also fixed to the support base plate, making its overall structure more stable and reducing the difficulty of control.

[0018] 5. The universal docking mechanism adopts a detachable spherical docking joint, which is easy to repair and install, reducing the manufacturing cost. The spherical docking joint can better adapt to the three-degree-of-freedom adjustment balance cylinder group, and can bear the upper blocks at various angles to adapt to more sea conditions. The spherical steel sleeve protects the docking device, prolongs the service life of the docking device, and is easy to disassemble and maintain.

[0019] 6. Use attitude sensors, displacement sensors, and pressure sensors to accurately monitor the position, displacement, and force of the deck support device during operation. The monitoring data is transmitted to the computer and then fed back to each sensor after calculation by the computer, so as to realize real-time feedback adjustment of the upper block.

[0020] The present invention also has other beneficial effects which are described in the embodiments of the specification and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a deck supporting device according to an embodiment of the present invention; Figure 2 for Figure 1 Main view of the middle deck support structure; Figure 3 for Figure 1 Top view of the mid-deck support structure.

[0022] Figure numerals: 100, deck support device; 1, upper docking device; 2, lower docking device; 3, fixed connection piece; 4, rubber pad; 5, support platform; 6, load-bearing hydraulic cylinder; 7, vertical adjustment hydraulic cylinder; 8, oblique telescopic cylinder; 9, vertical support hydraulic cylinder; 10, lower ball chain; 11, posture sensor; 12, support base plate; 13, displacement sensor; 14, steel sleeve fixing plate; 15, spherical steel sleeve; 16, spherical butt joint; 17, pressure sensor; 18, docking connecting rod; 19, upper ball chain. DETAILED DESCRIPTION

[0023] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the attached Figures 1 to 3 The technical solutions of the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0024] like Figures 1 to 3As shown, an adjustable deck support device for floating installation of an offshore platform of the present invention, 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 adjustment balance cylinder group. The support platform 5 is correspondingly arranged above the support base plate 12, and a through hole is arranged in the center of the support platform 5, and the through hole can meet the passage of the universal docking mechanism. The load-bearing hydraulic cylinder 6 is correspondingly arranged in the center of the support base plate 12, the universal docking mechanism is correspondingly hinged to the top of the hydraulic rod of the load-bearing hydraulic cylinder 6, and the universal docking mechanism extends out of the support platform 5 through the through hole, and the docking device is correspondingly arranged at the top of the support platform 5, and the center of the docking device is ball-hinged with the universal docking mechanism, so that the docking device can be adjusted in angle through the universal docking mechanism. The three-degree-of-freedom adjustment balance cylinder group includes a plurality of groups correspondingly arranged 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 the structure thereon to be rotated and adjusted at multiple angles in space. The deck support device of the present invention can bear heavy upper modules, has wave compensation capability, increases floating installation docking efficiency, improves load transfer work efficiency, and reduces offshore operation time.

[0025] like Figure 1~2 As shown, the docking device includes an upper docking device 1 and a lower docking device 2 which are arranged correspondingly from top to bottom. The upper docking device 1 and the lower docking device 2 are fixedly connected by a plurality of fixed connectors 3 arranged in the circumferential direction thereof. The fixed connectors 3 can adopt fixed screws to realize 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 at 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 is arranged at the center of the steel sleeve fixing plate 14, a spherical docking joint 16 is rotatably connected in the spherical steel sleeve 15, and the spherical docking joint 16 is fixedly connected to the hydraulic rod of the load-bearing hydraulic cylinder 6 through a docking connecting rod 18. The spherical docking joint 16 of the universal docking mechanism rotating in the docking device bears the load of the upper assembly. The detachable spherical docking joint 16 is convenient for maintenance and installation, and reduces the manufacturing cost. The spherical docking joint 16 can be better adapted to the three-degree-of-freedom adjustable balance cylinder group, and can bear the upper assembly at various angles to adapt to more sea conditions. The spherical steel sleeve 15 protects the docking device, prolongs the service life of the docking device, and is convenient for disassembly and maintenance.

[0026] In a specific embodiment, the hydraulic rod of the load-bearing hydraulic cylinder 6 is connected to the spherical joint 16 through a docking link 18. The docking link 18 has a quarter circle facing 90° connected to the slot in the hydraulic rod, so that the spherical joint 16 can be detachably connected, which is convenient for maintenance and replacement. The spherical joint 16 is connected to the spherical cylinder sleeve of the docking device, and the support platform 5 and the spherical joint 16 have space for rotation in the docking device. Before the spherical steel sleeve 15 set in the docking device is connected to the spherical joint 16, lubricating grease is applied. The spherical steel sleeve 15 is fixedly connected to the connection between the upper docking device 1 and the lower docking device 2 through a steel sleeve fixing plate to prevent the spherical joint 16 from being offset due to excessive friction when rotating; the spherical steel sleeve 15 serves as an isolation device between the spherical joint 16 and the docking device, which can not only make the docking operation more accurate, but also extend the service life of the spherical joint 16 and the docking device, and has the advantages of convenient maintenance and replacement.

[0027] like Figure 1~2 As shown, a rubber pad 4 for buffering deformation is arranged between the lower docking connector 2 and the supporting platform 5. A circular hole for the spherical docking joint 16 to pass through is arranged in the center of the rubber pad 4. The rubber pad 4 transfers part of the pressure of the upper block borne by the docking connector to the supporting platform 5, and serves as a buffer between the supporting platform 5 and the docking connector when the deck support device rotates.

[0028] like Figure 1~2 As shown, three vertical support hydraulic cylinders 9 are evenly distributed in the circumferential direction close to 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 the hydraulic rods are hinged to the support platform 5. The three vertical support hydraulic cylinders 9 support the outer periphery of the central through hole of the support platform 5 to prevent the outer and inner circles of the support platform 5 from being unevenly stressed and causing damage to the deck support device.

[0029] like Figure 1~2 As shown, the three-degree-of-freedom adjustment balance cylinder group includes three oblique telescopic cylinders 8 and three vertical adjustment hydraulic cylinders 7 evenly distributed along the circumference of the load-bearing hydraulic cylinder 6. The vertical support hydraulic cylinder 9 and the vertical adjustment hydraulic cylinder 7 are fixed on the support base plate 12, and the top of the hydraulic rod is hinged to the support platform 5 through the upper ball chain 19; the oblique telescopic cylinder 8 is hinged to the support platform 5 and the support base plate 12 through the upper ball chain 19 and the lower ball chain 10 respectively. The oblique telescopic cylinder 8 and the vertical adjustment hydraulic cylinder 7 control the support platform 5 and the docking device to adjust the posture of the upper block, and the multi-angle control balance of the upper block is achieved by docking with the docking device through the detachable spherical docking joint 16, which greatly reduces the stress imbalance that may be caused by the platform to bear the upper block due to the low lifting accuracy of the hydraulic cylinder or the mismatch of the hydraulic cylinders, thereby reducing the risk of damage to the deck support device.

[0030] like Figure 2As shown, three vertical adjustment hydraulic cylinders 7 and three oblique telescopic cylinders 8 are arranged at intervals along the circumference of the load-bearing hydraulic cylinder 6. The hydraulic rods of the vertical adjustment hydraulic cylinder 7 and the oblique telescopic cylinder 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 cylinders 8 and the horizontal direction is 60°. The vertical support hydraulic cylinder 9 plays the role of auxiliary support for the upper block. The angle between the oblique telescopic cylinder 8 and the horizontal plane is 60°. The combination of the vertical adjustment hydraulic cylinder 7 can withstand large weight loads and can adapt to more sea conditions. In addition to being articulated with the support platform 5 and the support base plate 12 ball chain, the deck support device is also fixed to the support base plate 12 to make its overall structure more stable and reduce the difficulty of control.

[0031] like Figures 1 to 3 As shown, a circular pressure sensor 17 is correspondingly arranged between the docking connecting rod 18 and the hydraulic rod of the load-bearing hydraulic cylinder 6, and a pressure sensor 17 for monitoring the force conditions of each hydraulic cylinder is arranged at the docking point 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 adjustment balance cylinder group is provided with a displacement sensor 13 at the upper end of the hydraulic rod, and the displacement sensor 13 is used to monitor the displacement distance of each hydraulic rod. A posture sensor 11 is arranged on the support base plate 12, and the posture sensor 11 is used to detect the height required to be lifted by the hydraulic cylinder and the posture required to be compensated, and is fed back by the computer to the load-bearing hydraulic cylinder 6 and the three-degree-of-freedom adjustment cylinder group to adjust the posture of the support platform 5, and the angle adjustment of the structure on it is completed with the help of the docking device. The displacement sensor 13 receives the data fed back by the computer based on the pressure sensor 17 and the posture sensor 11 to accurately feedback the control result.

[0032] The load-bearing hydraulic cylinder 6, the vertical support hydraulic cylinder 9 and the three-degree-of-freedom adjustment and balancing cylinder group of the present invention all include a hydraulic cylinder body, a hydraulic rod and a servo valve that provides driving force for 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 adjustment and balancing cylinder group. 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 adjustment and balancing cylinder group, but the stroke of its piston rod is slightly shorter than that of the piston rod of the three-degree-of-freedom adjustment and balancing cylinder group. The load-bearing hydraulic cylinder 6 is controlled by the hydraulic servo valve to bear the weight of the upper block and the three-degree-of-freedom adjustment and balancing cylinder group to realize the three-degree-of-freedom motion control of the support platform 5 and the docking device. The pressure sensor 17 and the posture sensor 11 are combined to collect information and feedback it to the upper computer for calculation, so as to realize safer wave compensation for the upper block for the movement of the barge at sea while bearing the heavy upper block, improve the operation efficiency, reduce the offshore operation time, expand the floating operation window period, and adapt to more complex sea conditions.

[0033] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An adjustable deck support device for floating installation of an offshore platform, characterized in that: The deck supporting device (100) comprises: A supporting substrate (12); A support platform (5), the support platform (5) being arranged correspondingly above the support substrate (12), and a through hole being arranged at the centre of the support platform (5); A load-bearing hydraulic cylinder (6), the load-bearing hydraulic cylinder (6) being correspondingly arranged at the center of the supporting base plate (12); A universal docking mechanism, the universal docking mechanism being hingedly connected to the top end of the hydraulic rod of the load-bearing hydraulic cylinder (6), and the universal docking mechanism extending through the through hole to the support platform (5); A docking device, the docking device being arranged correspondingly at the top of the support platform (5), and the center of the docking device being ball-jointed with the universal docking mechanism; A three-degree-of-freedom adjustable balancing cylinder group, the three-degree-of-freedom adjustable balancing cylinder group comprising a plurality of groups which are correspondingly arranged between a supporting base plate (12) and a supporting platform (5) and are evenly distributed along the circumference of a load-bearing hydraulic cylinder (6), allowing the supporting platform (5) and a structure thereon to be rotatably adjusted at multiple angles in space.

2. The adjustable deck support device for floating installation of an offshore platform according to claim 1, characterized in that: The docking device comprises an upper docking device (1) and a lower docking device (2) which are arranged correspondingly above and below, and the upper docking device (1) and the lower docking device (2) are fixedly connected via a plurality of fixed connecting parts (3) arranged in their circumferential direction.

3. The adjustable deck support device for floating installation of an offshore platform according to claim 2, characterized in that: The universal docking mechanism comprises a steel sleeve fixing plate (14) arranged at 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 at the center of the steel sleeve fixing plate (14); a spherical docking joint (16) is rotatably connected inside the spherical steel sleeve (15); and the spherical docking joint (16) is fixedly connected to the hydraulic rod of the load-bearing hydraulic cylinder (6) via a docking connecting rod (18).

4. The adjustable deck support device for floating installation of an offshore platform according to claim 3, characterized in that: A rubber pad (4) for buffering deformation is provided between the lower docking device (2) and the supporting platform (5), and a circular hole for the spherical docking joint (16) to pass through is provided in the center of the rubber pad (4).

5. The adjustable deck support device for floating installation of an offshore platform according to claim 3, characterized in that: A circular pressure sensor (17) is correspondingly arranged between the butt-jointed connecting rod (18) and the hydraulic rod of the load-bearing hydraulic cylinder (6).

6. The adjustable deck support device for floating installation of an offshore platform according to any one of claims 1 to 5, characterized in that: Three vertical support hydraulic cylinders (9) are evenly distributed in the circumferential direction close to the central through hole of the support platform (5); The three-degree-of-freedom adjustable balancing cylinder group comprises three oblique telescopic cylinders (8) and three vertical adjustment hydraulic cylinders (7) uniformly distributed along the circumference of the load-bearing hydraulic cylinder (6); The vertical support hydraulic cylinder (9) and the vertical adjustment hydraulic cylinder (7) are fixed on the support base plate (12), and the top ends of their hydraulic rods are hinged to the support platform (5) via an upper ball chain (19); the oblique telescopic cylinder (8) is hinged to the support platform (5) and the support base plate (12) via an upper ball chain (19) and a lower ball chain (10), respectively.

7. The adjustable deck support device for floating installation of an offshore platform according to claim 6, characterized in that: Three vertical adjustment hydraulic cylinders (7) and three oblique telescopic cylinders (8) are arranged at intervals along the circumference of the load-bearing hydraulic cylinder (6), and the hydraulic rods of the vertical adjustment hydraulic cylinder (7) and the oblique telescopic cylinder (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 hinge points of the three oblique telescopic cylinders (8) and the lower fixed points of the three vertical support hydraulic cylinders (9) are on the same diameter, and the angle difference of the lower hinge points of the three oblique telescopic cylinders (8) is 120°.

8. The adjustable deck support device for floating installation of an offshore platform according to claim 7, characterized in that: The angle between the line connecting the upper and lower hinge points of the oblique telescopic cylinder (8) and the horizontal direction is 60°.

9. The adjustable deck support device for floating installation of an offshore platform according to claim 8, characterized in that: Each hydraulic cylinder of the three-degree-of-freedom adjustment balancing cylinder group is provided with a displacement sensor (13) at the upper end of the hydraulic rod, and the displacement sensor (13) is used to monitor the displacement distance of each hydraulic rod; A pressure sensor (17) for monitoring the force applied to each hydraulic cylinder is provided at the joints between the vertical support hydraulic cylinder (9), the vertical adjustment hydraulic cylinder (7) and the oblique telescopic cylinder (8) and the support platform (5); The support base plate (12) is provided with a posture sensor (11), which is used to detect the height that the hydraulic cylinder needs to lift and the posture that needs to be compensated, and is fed back by a computer to the load-bearing hydraulic cylinder (6) and the three-degree-of-freedom adjustment cylinder group to adjust the posture of the support platform (5), and to adjust the angle of the structure on it with the help of a docking device; the displacement sensor (13) receives the data fed back by the computer from the pressure sensor (17) and the posture sensor (11) to provide accurate feedback on the control result.

10. The adjustable deck support device for floating installation of an offshore platform according to claim 9, characterized in that: The load-bearing hydraulic cylinder (6), the vertical support hydraulic cylinder (9) and the three-degree-of-freedom adjustment balance cylinder group all comprise a hydraulic cylinder body, a hydraulic rod and a servo valve that provides driving force for the hydraulic rod.

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