Self-weight stable type offshore floating operation platform

Abstract

The invention relates to the field of ocean engineering equipment, in particular to a self-weight stable type offshore floating operation platform which comprises a floating box, a spherical hinge, a first frame, a second frame and a suspension support. Supporting legs are fixed to the four corners of the bottom face of the first frame respectively, and the lower ends of the supporting legs are connected with the buoyancy tanks through spherical hinges. The first frame and the second frame are of a double-axis symmetric structure, and the first frame and the second frame are connected through an outer pin shaft located on a first symmetric axis to form a rotatable double-ring assembly. The second frame is connected with the suspension bracket through an inner pin shaft positioned on a second symmetric axis; the lower layer of the suspension support is a balancing weight, the upper layer of the suspension support is a working platform, and the working platform and the balancing weight are supported through a hinge rod piece. The invention has the advantages of simple structure, low cost, good stability control effect and the like.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering equipment, and in particular to a self-weight-stabilized offshore floating operating platform. Background Art

[0002] Offshore floating platforms play an important role in the fields of marine development, resource exploration, offshore wind power installation and maintenance. As marine development moves towards deep sea and offshore, higher requirements are placed on the structural design and stability control of the platform. In terms of structural design, existing technologies usually use buoyancy structures to support the platform, such as buoys and pontoons. These structures are reasonably arranged and dimensioned to enable the platform to obtain sufficient buoyancy to maintain a floating state. In terms of stability control, existing offshore floating platforms mainly use active and passive methods. Passive stability control relies on the platform's own structural design and mass distribution to achieve stability, such as by lowering the center of gravity and increasing structural stiffness. Active stability control uses sensors to monitor the platform's attitude information in real time, such as roll, pitch and yaw, and then drives the motor or other actuators through the control system to adjust the platform's attitude to achieve stable control.

[0003] There are still some deficiencies in the structural design and stability control of existing offshore floating work platforms. Some platforms increase the waterplane area and stiffness of the platform by setting up multiple columns and connecting trusses, thereby reducing the amplitude of the platform's longitudinal motion, but the stability control effect of this method is limited. Active control systems are relatively expensive and require continuous motor control and energy support. Therefore, it is of great practical significance to develop an offshore floating work platform with simple structure, low cost and good stability control effect. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a self-weight-stabilized offshore floating operating platform with a simple structure, low cost and good stability control effect, in view of the background requirements and technical difficulties described in the above background technology.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a self-weight stable offshore floating work platform, including a pontoon, a spherical joint, a first frame, a second frame and a suspension bracket; support legs are respectively fixed at the four corners of the bottom surface of the first frame, and the lower ends of the support legs are connected to the pontoon by spherical joints; the first frame and the second frame are of a double-axis symmetrical structure, and the first frame and the second frame are connected by an outer pin shaft located on the first symmetry axis to form a rotatable double-ring assembly; the second frame and the suspension bracket are connected by an inner pin shaft located on the second symmetry axis; the lower layer of the suspension bracket is a counterweight block, and the upper layer is a work platform, and the work platform and the counterweight block are supported by hinged rods.

[0006] Furthermore, the first frame and the second frame have through holes on the first symmetry axis, and the through holes on the first frame and the second frame have the same diameter; the first frame and the second frame are connected by a paired external pin shaft, and the outer diameter of the external pin shaft is 1-2mm smaller than the inner diameter of the through hole; both ends of the external pin shaft are provided with threads and nuts, and the surface of the middle section of the external pin shaft is smooth, and the length of the smooth section is 5-10mm longer than the net distance between the outer end face of the first frame and the inner end face of the second frame.

[0007] Further, the second symmetry axis is a symmetry axis of the second frame that is perpendicular to the first symmetry axis.

[0008] Furthermore, a through hole is opened along the second symmetry axis on the second frame; the suspension bracket is a uniaxial symmetrical structure, the suspension bracket fulcrum is located on its symmetry plane, and the diameter of the through hole at the fulcrum is the same as the diameter of the through hole of the second frame; the second frame and the suspension bracket are connected by a pair of inner pin shafts, and the outer diameter of the inner pin shaft is 1-2mm smaller than the inner diameter of the through hole; both ends of the inner pin shaft are provided with threads and nuts, and the surface of the middle section of the inner pin shaft is smooth.

[0009] Furthermore, the spherical joint is a structure of an outer spherical shell and an inner spherical core, the inner spherical core is located at the center of the top surface of the buoyancy box and is fixed by welding or internal anchoring; the outer spherical shell is a bottom-opening spherical shell structure, and the diameter of the inner spherical cavity of the outer spherical shell is 1-2 mm larger than the outer diameter of the inner spherical core.

[0010] Furthermore, the suspension bracket is a double-layer structure, the lower layer is a counterweight block, which is U-shaped, has a mass of m and a width of d; the upper layer is a working platform with a width of D, and the maximum load required to be borne by the working platform is F; the vertical distance between the center of the pin shaft in the suspension bracket and the upper working platform is L1, and the vertical distance to the lower counterweight block is L2, then the mass m of the counterweight block and the maximum load should satisfy the following relationship so that the rotation range of the working platform is within 10°: ,in g is the acceleration due to gravity.

[0011] Furthermore, there are four articulated rods, which are respectively arranged at the four corners of the suspension bracket. The upper end of each articulated rod is hinged to the working platform, and the lower end is hinged to the counterweight.

[0012] Furthermore, the through holes on the first frame, the second frame and the suspension bracket should be reinforced, and the net section bearing capacity should be verified to meet the bending and shear requirements; the outer pin shaft between the first frame and the second frame, and the inner pin shaft between the second frame and the suspension bracket should be verified for shear resistance to meet the strength requirements.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The spherical hinge design between the support legs of the first frame of the present invention and the pontoon enables multi-directional rotation, eliminating the bending moment effect of the random swing of the pontoon on the support legs; the orthogonal rotatable pin connection between the first frame, the second frame and the suspension bracket can eliminate the swing effect of the up and down movement of the pontoon, the suspension bracket fulcrum remains horizontal, and the working platform always remains horizontal and stable under the deadweight of the counterweight block; In summary, the present invention eliminates the swinging effect of ocean waves through a double-ring structure with spherical hinges at the supporting legs and alternating pin connections in the directions of two symmetry axes, supports the working platform through a self-weight suspension bracket, and realizes self-stabilization of the working platform through a multi-component design. No additional active control measures are required, and the invention has the advantages of simple structure, low cost, and good stability control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a self-weight-stabilized offshore floating operation platform according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure and connection method of the first frame and the second frame; Figure 3 is a schematic diagram of a spherical hinge connection between the first frame and the buoyancy box; Figure 4 It is a schematic diagram of the suspension bracket structure; Figure 5 It is a schematic diagram of the deformation state of the self-weight-stabilized offshore floating operation platform under the violent swaying and dislocation of the offshore pontoon; Description of reference numerals in the figures: 1. Floating tank, 2. Spherical hinge, 3. First frame, 4. Second frame, 5. Suspension bracket, 6. Counterweight, 7. Working platform, 8. Support leg, 9. Through hole, 10. First symmetry axis, 11. Outer pin shaft, 12. Second symmetry axis, 13. Articulated rod, 14. Inner pin shaft, 21. Outer spherical shell, 22. Inner spherical core. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments, not all of the embodiments. Based on this embodiment, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Reference Figures 1 to 5A self-weight stable offshore floating work platform comprises a pontoon 1, a spherical joint 2, a first frame 3, a second frame 4 and a suspension bracket 5; support legs 8 are fixed at the four corners of the bottom surface of the first frame 3, and the lower ends of the support legs 8 are connected to the pontoon 1 by spherical joints 2; the first frame 3 and the second frame 4 are of a double-axis symmetrical structure, and the first frame 3 and the second frame 4 are connected by an outer pin shaft 11 located on the first symmetry axis 10 to form a rotatable double-ring assembly; the second frame 4 and the suspension bracket 5 are connected by an inner pin shaft 14 located on the second symmetry axis 12; the lower layer of the suspension bracket 5 is a counterweight block 6, and the upper layer is a work platform 7, and the work platform 7 and the counterweight block 6 are supported by a hinged rod 13.

[0017] Specifically, the first frame 3 and the second frame 4 have through holes 9 on the first symmetry axis 10, and the through holes 9 on the first frame 3 and the second frame 4 have the same diameter. The first frame 3 and the second frame 4 are connected by a paired outer pin shaft 11, and the outer diameter of the outer pin shaft 11 is 1-2 mm smaller than the inner diameter of the through hole 9. Both ends of the outer pin shaft 11 are provided with threads and nuts, and the surface of the middle section of the outer pin shaft 11 is smooth, and the length of the smooth section is 5-10 mm longer than the net distance between the outer end surface of the first frame 3 and the inner end surface of the second frame 4.

[0018] Specifically, the second symmetry axis 12 is a symmetry axis of the second frame 4 that is perpendicular to the first symmetry axis 10. A through hole 9 is opened on the second frame 4 along the second symmetry axis 12. The suspension bracket 5 is a uniaxial symmetrical structure, and the fulcrum of the suspension bracket 5 is located on its symmetry plane. The diameter of the through hole 9 at the fulcrum is the same as the diameter of the through hole 9 of the second frame 4. The second frame 4 and the suspension bracket 5 are connected by a pair of inner pins 14, and the outer diameter of the inner pin 14 is 1-2mm smaller than the inner diameter of the through hole 9. Both ends of the inner pin 14 are provided with threads and nuts, and the surface of the middle section of the inner pin 14 is smooth.

[0019] Specifically, the spherical joint 2 is a structure of an outer spherical shell 21 and an inner spherical core 22. The inner spherical core 22 is located at the center of the top surface of the buoyancy box 1 and is fixed by welding or internal anchoring. The outer spherical shell 21 is a bottom-opening spherical shell structure, and the inner spherical cavity diameter of the outer spherical shell 21 is 1-2 mm larger than the outer diameter of the inner spherical core 22.

[0020] Specifically, the suspension bracket 5 is a double-layer structure, the lower layer is a counterweight block 6, which is U-shaped, has a mass of m, and a distribution width of the lower counterweight block 6 is d; the upper layer is a working platform 7, has a width of D, and the maximum load required to be borne by the working platform 7 is F. The vertical distance between the center of the pin shaft 14 in the suspension bracket 5 and the upper working platform 7 is L1, and the vertical distance between the center of the pin shaft 14 and the lower counterweight block 6 is L2. The following relationship should be satisfied between the mass m of the counterweight block 6 and the maximum load so that the rotation range of the working platform 7 is within 10°: ,in g is the acceleration due to gravity.

[0021] Specifically, there are four hinged rods 13 , which are respectively arranged at four corners of the suspension bracket 5 . The upper end of each hinged rod 13 is hinged to the working platform 7 , and the lower end is hinged to the counterweight 6 .

[0022] Specifically, the through holes 9 on the first frame 3, the second frame 4, and the suspension bracket 5 should be strengthened, and the net section bearing capacity should be checked to meet the bending and shear requirements; the outer pin shaft 11 between the first frame 3 and the second frame 4, and the inner pin shaft 14 between the second frame 4 and the suspension bracket 5 should be checked for shear resistance to meet the strength requirements.

[0023] like Figure 5 As shown, the present invention eliminates the swinging effect of ocean waves through an orthogonal double-ring connection connected by a spherical joint 2 at a supporting leg 8, an outer pin shaft 11 located at a first symmetry axis 10, and an inner pin shaft 14 located at a second symmetry axis 12 in a direction perpendicular thereto, and supports the working platform 7 through a self-weight suspension bracket 5. The multi-component design realizes self-stabilization of the working platform 7 without the need for additional active control measures.

[0024] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A self-weight-stabilized offshore floating operation platform, characterized in that: It includes a buoyancy box, a spherical joint, a first frame, a second frame and a suspension bracket; support legs are fixed at the four corners of the bottom surface of the first frame, and the lower ends of the support legs are connected to the buoyancy box by spherical joints; the first frame and the second frame are of a double-axis symmetrical structure, and the first frame and the second frame are connected by an outer pin shaft located on the first symmetry axis to form a rotatable double-ring assembly; the second frame and the suspension bracket are connected by an inner pin shaft located on the second symmetry axis; the lower layer of the suspension bracket is a counterweight block, and the upper layer is a working platform, and the working platform and the counterweight block are supported by hinged rods.

2. The self-weight-stabilized offshore floating operation platform according to claim 1 is characterized in that: The first frame and the second frame have through holes on the first symmetry axis, and the through holes on the first frame and the second frame have the same diameter; the first frame and the second frame are connected by a paired outer pin shaft, and the outer diameter of the outer pin shaft is 1-2mm smaller than the inner diameter of the through hole; both ends of the outer pin shaft are provided with threads and nuts, and the surface of the middle section of the outer pin shaft is smooth, and the length of the smooth section is 5-10mm longer than the net distance between the outer end face of the first frame and the inner end face of the second frame.

3. The self-weight-stabilized offshore floating operation platform according to claim 1 or 2, characterized in that: The second symmetry axis is a symmetry axis of the second frame that is perpendicular to the first symmetry axis.

4. The self-weight-stabilized offshore floating operation platform according to claim 1 or 2, characterized in that: A through hole is opened along the second symmetry axis on the second frame; the suspension bracket is a single-axis symmetrical structure, the suspension bracket fulcrum is located on its symmetry plane, and the diameter of the through hole at the fulcrum is the same as the diameter of the through hole of the second frame; the second frame and the suspension bracket are connected by a pair of inner pin shafts, and the outer diameter of the inner pin shaft is 1-2mm smaller than the inner diameter of the through hole; both ends of the inner pin shaft are provided with threads and nuts, and the surface of the middle section of the inner pin shaft is smooth.

5. The self-weight-stabilized offshore floating operation platform according to claim 1 or 2, characterized in that: The spherical joint is a structure of an outer spherical shell and an inner spherical core. The inner spherical core is located at the center of the top surface of the buoyancy box and is fixed by welding or internal anchoring. The outer spherical shell is a bottom-opening spherical shell structure, and the diameter of the inner spherical cavity of the outer spherical shell is 1-2 mm larger than the outer diameter of the inner spherical core.

6. The self-weight-stabilized offshore floating operation platform according to claim 1 or 2, characterized in that: The suspension bracket is a double-layer structure. The lower layer is a counterweight block, which is U-shaped, has a mass of m and a width of d; the upper layer is a working platform with a width of D. The maximum load required on the working platform is F; the vertical distance between the center of the pin shaft in the suspension bracket and the upper working platform is L1, and the vertical distance to the lower counterweight block is L2. The mass m of the counterweight block and the maximum load should satisfy the following relationship so that the rotation range of the working platform is within 10°: ,in g is the acceleration due to gravity.

7. The self-weight-stabilized offshore floating operation platform according to claim 1 or 2, characterized in that: There are four hinged rods, which are respectively arranged at the four corners of the suspension bracket. The upper end of each hinged rod is hinged to the working platform, and the lower end is hinged to the counterweight block.

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