Connection node for FPSO upper module and connection method thereof

Abstract

The invention relates to the technical field of offshore oil engineering facilities, in particular to a connecting joint for an FPSO upper module and a connecting method of the connecting joint. The connecting joint comprises cross beams and longitudinal beams which are perpendicularly and fixedly arranged in a staggered mode, stand columns are fixedly connected to the tops of the cross beams, and leg columns are fixedly connected to the bottoms of the cross beams; inclined struts are fixedly connected to the vertical planes of the cross beams, the longitudinal beams and the stand columns, supporting parts are fixedly arranged at the bottoms of the inclined struts, the cross beam webs and the longitudinal beam webs are connected through the fixing plates, a stable triangular structure is formed among the cross beam webs, the longitudinal beams and the fixing plates, external loads and deformation can be effectively resisted, and therefore the overall stability of the whole upper module is enhanced; the cross beam and the longitudinal beam are effectively prevented from bending, twisting and other deformation when stressed, the integrity and stability of the structure are ensured, the limiting block is arranged at one end of the inclined strut insertion plate to increase the contact area with the stand column, the supporting part arranged in a sliding mode can flexibly conduct position adjustment on the cross beam or the longitudinal beam, and fine adjustment is conducted according to the actual stress condition of the inclined strut.

Description

Technical Field

[0001] The invention relates to the technical field of offshore petroleum engineering facilities, and in particular to a connection node for an FPSO upper module and a connection method thereof. Background Art

[0002] FPSO is a large-scale marine engineering equipment for the extraction, processing, storage and export of oil and gas. Its upper module structure is usually a multi-layer truss structure, and its nodes are usually composed of round tubes and beams. The commonly used form is that the round tube is used as a column to pass through the node, the beam is welded to the round tube through a ring plate, and the diagonal brace and the column are connected in the form of a pipe node.

[0003] When the upper module structure has obvious stress concentration in the connection form, it is difficult to weld the round pipe and the steel section, and the reinforcement ring support rib plate inside the pipe is complicated to set and difficult to install. In view of this, a connection node and a connection method for the upper module of FPSO are provided. Summary of the invention

[0004] The main purpose of the present invention is to provide a connection node and a connection method for an FPSO upper module, so as to solve the problems proposed in the related art that the upper module structure has obvious stress concentration in the connection form, the welding of round pipes and steel sections is difficult, and the setting of the reinforcing ring support ribs in the pipe is complicated and difficult to install.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a connection node for an upper module of an FPSO, comprising cross beams and longitudinal beams which are staggered and vertically fixedly arranged, wherein the top of the cross beams is fixedly connected to a column, the bottom of the cross beams is fixedly connected to a leg column, the cross beams and longitudinal beams are fixedly connected to diagonal braces on a vertical plane with the columns, a support portion is fixedly arranged at the bottom of the diagonal brace, and one end of the support portion is slidably arranged on the cross beams and longitudinal beams.

[0006] Furthermore, the crossbeam includes two symmetrically arranged upper flanges and lower flanges of the crossbeam, a crossbeam web is fixedly arranged between the upper flanges of the crossbeam and the lower flanges of the crossbeam, a column support rib is fixedly arranged between the upper flanges of the crossbeam and the lower flanges of the crossbeam, and the column support rib is perpendicular to the crossbeam web.

[0007] Furthermore, the longitudinal beam comprises two symmetrically arranged longitudinal beam upper flanges and a longitudinal beam lower flange, and a longitudinal beam web is fixedly arranged between the longitudinal beam upper flange and the longitudinal beam lower flange.

[0008] Furthermore, the column includes two symmetrically arranged left and right flanges of the column, a column web is fixedly arranged between the left and right flanges of the column, an inserted plate reinforcement rib is fixedly arranged between the left and right flanges of the column, and the inserted plate reinforcement rib is perpendicular to the column web.

[0009] Furthermore, the leg column is a circular tube, and a leg column insertion plate is fixedly provided on the outer wall of the top of the leg column symmetrically. The side wall of one side of the leg column insertion plate is fixedly connected to the bottom of the lower flange of the beam, and the direction of the leg column insertion plate is consistent with the web of the beam.

[0010] Furthermore, a fixing plate is fixedly arranged in the vertical plane of the web of the cross beam and the web of the longitudinal beam, one end of the fixing plate is fixedly connected to the web of the cross beam, and the other end of the fixing plate is fixedly connected to the web of the longitudinal beam.

[0011] Furthermore, a diagonal brace insertion plate is fixedly arranged in the plane formed by the upper flange of the cross beam and the web of the column, one side of the diagonal brace insertion plate is fixedly connected to the upper flange of the cross beam, and the other side of the diagonal brace insertion plate is fixedly connected to the left flange of the column. In a plane perpendicular to the above plane, the diagonal brace insertion plate is aligned with the web of the longitudinal beam, and the lower surface of the insertion plate reinforcement rib is fixedly connected to the upper surface of the diagonal brace insertion plate.

[0012] Furthermore, the oblique brace is obliquely inserted and fixedly arranged on the oblique brace insertion plate, and limiting blocks are fixedly arranged on both sides of one end of the oblique brace insertion plate.

[0013] Furthermore, the supporting part includes a sliding plate slidably mounted on the upper flange of the cross beam or the upper flange of the longitudinal beam, a connecting rod is fixedly arranged on the top of the sliding plate, one end of the connecting rod is fixedly connected to a support plate for supporting the diagonal brace, the upper surface of the support plate is arc-shaped, and screws are fixedly arranged on both sides of the sliding plate.

[0014] On the other hand, the present invention provides a connection method for a connection node for an FPSO upper module, which is used for any one of the connection nodes for an FPSO upper module described above, comprising the following steps: S1. The cross beams and longitudinal beams are fixedly connected vertically and staggered as a whole, and the fixing plates are fixedly connected in the vertical plane of the cross beams and longitudinal beams; S2. Fix the column on the top of the beam through the diagonal brace insertion plates in all directions, and fix the diagonal brace on the diagonal brace insertion plates; S3, fix the column support rib plate between the upper flange of the beam and the lower flange of the beam, and fix the insert plate reinforcement rib between the left flange of the column and the right flange of the column; S4. Slide the sliding plate on the upper flange of the cross beam and the upper flange of the longitudinal beam to make the support plate fit tightly with the diagonal brace, and fix the sliding plate with screws to form an overall upper module; S5. Hoist the upper module above the leg column, and fix the leg column to the lower surface of the lower flange of the beam through the leg column insertion plate to form the main frame of the FPSO upper module.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the connection node and connection method for the upper module of FPSO, a fixed plate is arranged to connect the web of the cross beam and the web of the longitudinal beam, and a stable triangular structure is formed between the three, which can effectively resist external loads and deformation, thereby enhancing the overall stability of the entire upper module, effectively preventing the cross beam and the longitudinal beam from bending, twisting and other deformations when subjected to force, and ensuring the integrity and stability of the structure; a limit block is arranged at one end of the diagonal brace insertion plate to increase the contact area with the column.

[0016] 2. In the connection node and connection method for the upper module of FPSO, the sliding support part can flexibly adjust its position on the crossbeam or longitudinal beam, and make fine adjustments according to the actual stress conditions of the diagonal brace, so as to more effectively disperse and balance the stress caused by the diagonal brace. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is a schematic diagram of the overall structure of the upper module of the FPSO in Example 1 of the present invention; Figure 2 This is one of the partial structural schematic diagrams of the upper module of the FPSO in Example 1 of the present invention; Figure 3 This is the second schematic diagram of the local structure of the upper module of the FPSO in Example 1 of the present invention; Figure 4 This is the third schematic diagram of the local structure of the upper module of the FPSO in Example 1 of the present invention; Figure 5 In Example 1 of the present invention Figure 4 A magnified view of the structure at center; Figure 6 This is a schematic diagram of the overall structure of the support part in Example 1 of the present invention.

[0018] Illustration Description: 1. Beam; 11. Upper flange of beam; 12. Web of beam; 13. Lower flange of beam; 2. Stringer; 21. Stringer upper flange; 22. Stringer web; 23. Stringer lower flange; 3. Column; 31. Right flange of column; 32. Web of column; 33. Left flange of column; 34. Reinforcement rib of insert plate; 4. Leg column; 41. Leg column insert plate; 5. Diagonal brace; 6. Support part; 61. Sliding plate; 62. Connecting rod; 621. Fixing rod; 622. Screw rod; 63. Support plate; 64. Screw; 7. Fixed plate; 8. Column supporting rib plate; 9. Diagonal support insertion plate; 91. Limit block. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0020] Embodiment 1: See also Figure 1-Figure 6 As shown, the purpose of this embodiment is to provide a connection node for the upper module of FPSO and a connection method thereof, including a cross beam 1 and a longitudinal beam 2 that are staggered and vertically fixed, the top of the cross beam 1 is fixedly connected to a column 3, the bottom of the cross beam 1 is fixedly connected to a leg column 4, the cross beam 1 and the longitudinal beam 2 are fixedly connected to a diagonal brace 2 on a vertical plane with the column 3, the bottom of the diagonal brace 5 is fixedly provided with a support portion 6, and one end of the support portion 6 is slidably provided on the cross beam 1 and the longitudinal beam 2.

[0021] The cross beam 1, longitudinal beam 2 and column 3 are all made of H-shaped steel. The cross-sectional design of H-shaped steel enables it to better distribute stress when subjected to force, thereby improving the bearing capacity and utilization efficiency of steel. At the same time, H-shaped steel also has the advantages of light weight, easy processing and installation, and is suitable for various large-scale steel structure projects. In the upper module of FPSO, the cross beam 1, longitudinal beam 2 and column 3 in the form of H-shaped steel can effectively resist the external forces such as wind, waves, and currents in the marine environment, ensuring the safety and stability of the overall structure.

[0022] The crossbeam 1 includes two symmetrically arranged upper beam flanges 11 and a lower beam flange 13, a crossbeam web 12 is fixedly arranged between the crossbeam upper flange 11 and the crossbeam lower flange 13, a column support rib 8 is fixedly arranged between the crossbeam upper flange 11 and the crossbeam lower flange 13, and the column support rib 8 is perpendicular to the crossbeam web 12, and its main function is to strengthen the connection between the crossbeam 1 and the column 3. By adding the column support rib 8, the stiffness and strength of the connection between the crossbeam 1 and the column 3 can be effectively improved, thereby ensuring the stability and safety of the overall structure when subjected to force.

[0023] The upper flange 11 and the lower flange 13 of the beam can be partially enlarged according to the node connection requirements, so that the beam 1 has a larger cross-sectional area and moment of inertia at the connection, thereby improving its load-bearing capacity and bending stiffness. Both use materials with out-of-plane tearing resistance, which can effectively prevent the beam 1 from being damaged by out-of-plane tearing when subjected to force. The beam 1 can also be thickened according to the node strength requirements. By increasing the wall thickness or flange thickness of the beam 1, its load-bearing capacity and deformation resistance can be further improved.

[0024] The longitudinal beam 2 includes two symmetrically arranged longitudinal beam upper flanges 21 and a longitudinal beam lower flange 23 , and a longitudinal beam web 22 is fixedly arranged between the longitudinal beam upper flange 21 and the longitudinal beam lower flange 23 .

[0025] The column 3 includes two symmetrically arranged column left flanges 33 and column right flanges 31, a column web 32 is fixedly arranged between the column left flange 33 and the column right flange 31, the column web 32 is aligned with the crossbeam web 12, and the flange is perpendicular to the crossbeam web 12, an inserted plate reinforcement rib 34 is fixedly arranged between the column left flange 33 and the column right flange 31, and the inserted plate reinforcement rib 34 is perpendicular to the column web 32, the main function of the inserted plate reinforcement rib 34 is to increase the cross-sectional area and moment of inertia of the column 3, thereby improving its bearing capacity and bending stiffness, and can also help disperse the stress on the column 3 to prevent local damage.

[0026] The leg column 4 is a round tube with excellent bearing capacity and wind pressure resistance. The cross-sectional shape of the round tube enables it to better distribute stress when subjected to force, avoiding the occurrence of stress concentration. At the same time, the round tube leg column 4 also has the advantages of light weight, easy processing and installation, etc. The top outer wall of the leg column 4 is symmetrically fixed with a leg column insertion plate 41. The side wall of one side of the leg column insertion plate 41 is fixedly connected to the bottom of the lower flange 13 of the beam, and the direction of the leg column insertion plate 41 is consistent with the web 12 of the beam, that is, the length direction of the leg column insertion plate 41 is parallel to the length direction of the web 12 of the beam, ensuring that the connection between the leg column 4 and the beam 1 is more stable and can effectively transfer the load. The leg column insertion plate 41 not only plays the role of connecting the leg column 4 and the beam 1, but also improves the bearing capacity and stability of the connection by increasing the connection area and dispersing stress, effectively transferring the load on the leg column 4 to the beam 1, thereby ensuring the stability of the overall structure.

[0027] A fixing plate 7 is fixedly arranged in the vertical plane of the crossbeam web 12 and the longitudinal beam web 22. One end of the fixing plate 7 is fixedly connected to the crossbeam web 12, and the other end of the fixing plate 7 is fixedly connected to the longitudinal beam web 22, forming a solid triangular area, which not only enhances the stability of the structure from a geometric point of view, but also through the stability principle of the triangle, enables the entire connection area to more effectively resist deformation and damage when subjected to external forces.

[0028] The fixing plate 7 not only connects the cross beam 1 and the longitudinal beam 2, but also improves the bearing capacity and stability of the connection by increasing the connection area and dispersing stress, and effectively transfers the loads on the cross beam 1 and the longitudinal beam 2 to each other, thereby ensuring the stability and bearing capacity of the entire structure. During the force-bearing process, the fixing plate 7 can disperse the stress more evenly to the cross beam web 12 and the longitudinal beam web 22, avoiding the occurrence of stress concentration.

[0029] A diagonal brace insertion plate 9 is fixedly arranged in the plane formed by the upper flange 11 of the crossbeam and the web 32 of the column, and one side of the diagonal brace insertion plate 9 is fixedly connected to the upper flange 11 of the crossbeam, and the other side of the diagonal brace insertion plate 9 is fixedly connected to the left flange 33 of the column, and the diagonal brace insertion plate 9 is aligned with the web 12 of the crossbeam; in a plane perpendicular to the above plane, the diagonal brace insertion plate 9 is aligned with the web 22 of the longitudinal beam, one side of the diagonal brace insertion plate 9 is fixedly connected to the side wall of the web 32 of the column, and the other side of the diagonal brace insertion plate 9 is fixedly connected to the upper surface of the upper flange 21 of the longitudinal beam, and the lower surface of the insert plate reinforcement rib 34 is fixedly connected to the upper surface of the diagonal brace insertion plate 9, so as to strengthen the structural strength of the column 3. This connection method ensures that the diagonal brace insertion plate 9 can effectively connect the crossbeam 1, the longitudinal beam 2 and the column 3 together to form a more stable overall structure.

[0030] The diagonal brace insert plate 9 is aligned with the cross beam web 12 and the longitudinal beam web 22. This design not only ensures the accuracy of the connection, but also improves the bearing capacity and stability of the connection by increasing the connection area and dispersing stress. At the same time, the diagonal brace insert plate 9 is also fixedly connected to the lower surface of the insert plate reinforcement rib 34. This additional reinforcement measure further enhances the structural strength of the column 3.

[0031] The diagonal brace 5 is arranged in one or more directions, and can be arranged in one or more directions on the same plane, or in one or more directions on multiple planes. The arrangement direction of the diagonal brace 5 is highly flexible and diverse, and can be selected and adjusted according to specific stress conditions and construction requirements. Reasonable arrangement of the diagonal brace 5 can significantly improve the stability and bearing capacity of the structure, and ensure the safety and reliability of the structure.

[0032] The diagonal brace 5 is fixedly inserted on the diagonal brace insertion plate 9, and the two sides of one end of the diagonal brace insertion plate 9 are fixedly provided with a limit block 91 to form a T shape. Figure 5 Taking the direction of the diagonal brace insertion plate 9 in the direction shown as an example, one side of the limit block 91 is also fixedly connected to the side wall of the left flange 33 of the column. The existence of the limit block 91 also increases the contact area between the diagonal brace insertion plate 9 and the left flange 33 of the column. When the diagonal brace insertion plate 9 is fixedly connected to the insertion plate reinforcement rib 34, they form a more stable overall structure. This connection not only enhances the strength of the column 3 itself, but also transfers the load more evenly to various parts of the column 3 through the diagonal brace insertion plate 9, thereby improving the overall stability and bearing capacity of the entire structure.

[0033] The supporting portion 6 includes a sliding plate 61 slidably mounted on the upper flange 11 of the crossbeam or the upper flange 21 of the longitudinal beam, and a connecting rod 62 is fixedly arranged on the top of the sliding plate 61, and one end of the connecting rod 62 is fixedly connected to a supporting plate 63 for supporting the diagonal brace 5. The upper surface of the supporting plate 63 is arc-shaped and fits the outer surface of the diagonal brace 5, which not only improves the supporting effect, but also reduces the shaking and friction of the diagonal brace 5 when subjected to force. Screws 64 are fixedly arranged on both sides of the sliding plate 61. The connecting rod 62 is a telescopic rod and can adjust the height. The connecting rod 62 includes two fixing rods 621, and a screw 622 is threadedly installed between the fixing rods 621, and the thread directions of the two ends of the screw 622 are opposite. Rotating the screw 622 in a clockwise direction causes the two fixing rods 621 to move away from each other to increase the height of the connecting rod 62, and rotating the screw 622 in a counterclockwise direction causes the two fixing rods 621 to move closer to each other to shorten the height of the connecting rod 62.

[0034] Since the stress conditions of the diagonal brace 5 are different in different situations, the sliding plate 61 can flexibly adjust the position of the support part 6, thereby optimizing the stability and bearing capacity of the entire structure. When the sliding plate 61 slides to the desired position, it can be firmly fixed on the crossbeam 1 or the longitudinal beam 2 by tightening the screws 64, thereby ensuring a stable connection between the support plate 63 and the diagonal brace 5. Since the stress conditions of the diagonal brace 5 may be different in different situations, it is necessary to fine-tune the position of the support part 6 according to the actual situation. The position of the support part 6 can be adjusted by slightly loosening the screws 64 and then sliding the sliding plate 61. After the adjustment is completed, the position of the support plate 63 can be fixed by tightening the screws 64 again.

[0035] When the present invention is used in practice, the cross beam 1 and the longitudinal beam 2 are vertically staggered and fixedly connected as a whole by welding. In the vertical plane of the cross beam 1 and the longitudinal beam 2, the fixing plate 7 is fixedly connected, and the column 3 is fixedly installed on the top of the cross beam 1 through the diagonal brace insertion plate 9. The diagonal brace 5 is fixedly arranged on the diagonal brace insertion plate 9, and the column support rib plate 8 is fixedly connected between the upper flange 11 of the cross beam and the lower flange 13 of the cross beam. The insertion plate reinforcement rib 34 is fixedly connected between the left flange 33 of the column and the right flange 31 of the column, and then the support plate 63 is connected to the diagonal brace 5. After sliding the sliding plate 61 to a suitable position, the support part 6 is fixed by tightening the screw 64 so that one end of the screw 64 is pressed against the flange to form an integral upper module. Subsequently, the integral upper module is hoisted to the top of the leg column 4 by using the hoisting equipment, and the leg column 4 is fixedly connected to the lower surface of the lower flange 13 of the cross beam through the leg column insertion plate 41, so as to finally form the main frame of the FPSO upper module.

[0036] Embodiment 2: The difference between Embodiment 2 of the present invention and Embodiment 1 is that this embodiment introduces a connection method used for a connection node of an upper module of an FPSO, including the following steps: S1. The cross beam 1 and the longitudinal beam 2 are fixedly connected vertically and staggered as a whole, and the fixing plate 7 is fixedly connected in the vertical plane of the cross beam 1 and the longitudinal beam 2 to increase the strength and stability of the connection and prevent the structure from being deformed or damaged when subjected to force; S2. The column 3 is fixedly installed on the top of the beam 1 by inserting the diagonal brace plates 9 in all directions. The diagonal brace inserting plates 9 are tightly fitted with the connection between the beam 1 and the column 3, and the connection is firm, and the diagonal brace 5 is fixedly set on the diagonal brace inserting plates 9; S3, the column support rib 8 is fixedly connected between the upper flange 11 of the beam and the lower flange 13 of the beam, so as to increase the connection strength and stability between the beam 1 and the column 3, and prevent the structure from being deformed or damaged when subjected to force, and the insert plate reinforcement rib 34 is fixedly connected between the left flange 33 of the column and the right flange 31 of the column, so as to further improve the structural strength and stability of the column 3; S4. Slide the sliding plate 61 on the upper flange 11 of the cross beam and the upper flange 21 of the longitudinal beam, tightly connect the support plate 63 with the diagonal brace 5, so that the support plate 63 bears the pressure of the diagonal brace 5, and fix the sliding plate 61 with the screw 64. According to the force of the diagonal brace 5, adjust the horizontal position of the sliding plate 61, and adjust the height of the connecting rod 62 with the screw 622, so that the support plate 63 and the outer wall of the diagonal brace 5 are closely fitted. After the adjustment is appropriate, tighten the screw 64 so that one end of the screw 64 presses against the fixed support part 6 at the flange to form an overall upper module; S5. Hoist the upper module above the leg column 4, and fix the leg column 4 to the lower surface of the lower flange 13 of the beam through the leg column insertion plate 41 to form the main frame of the FPSO upper module.

[0037] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in the form of preferred embodiments, it is not intended to limit the present invention. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A connection node for an upper module of an FPSO, comprising a cross beam (1) and a longitudinal beam (2) which are staggered and vertically fixed, characterized in that: The top of the cross beam (1) is fixedly connected to a column (3), the bottom of the cross beam (1) is fixedly connected to a leg column (4), the cross beam (1) and the longitudinal beam (2) are all fixedly connected to an oblique brace (5) on a vertical plane between the column (3), the bottom of the oblique brace (5) is fixedly provided with a support portion (6), and one end of the support portion (6) is slidably provided on the cross beam (1) and the longitudinal beam (2).

2. The connection node for the upper module of FPSO according to claim 1, characterized in that: The crossbeam (1) comprises two symmetrically arranged crossbeam upper flanges (11) and crossbeam lower flanges (13); a crossbeam web (12) is fixedly arranged between the crossbeam upper flange (11) and the crossbeam lower flange (13); a column support rib (8) is fixedly arranged between the crossbeam upper flange (11) and the crossbeam lower flange (13); and the column support rib (8) is perpendicular to the crossbeam web (12).

3. The connection node for the upper module of FPSO according to claim 2, characterized in that: The longitudinal beam (2) comprises two symmetrically arranged longitudinal beam upper flanges (21) and longitudinal beam lower flanges (23), and a longitudinal beam web (22) is fixedly arranged between the longitudinal beam upper flange (21) and the longitudinal beam lower flange (23).

4. The connection node for the upper module of FPSO according to claim 3, characterized in that: The column (3) comprises two symmetrically arranged column left flanges (33) and a column right flange (31), a column web (32) is fixedly arranged between the column left flange (33) and the column right flange (31), an insert plate reinforcement rib (34) is fixedly arranged between the column left flange (33) and the column right flange (31), and the insert plate reinforcement rib (34) is perpendicular to the column web (32).

5. The connection node for the upper module of FPSO according to claim 2, characterized in that: The leg column (4) is a circular tube, and a leg column insertion plate (41) is fixedly provided on the top outer wall of the leg column (4) in a symmetrical manner. A side wall of the leg column insertion plate (41) is fixedly connected to the bottom of the lower flange (13) of the crossbeam, and the direction of the leg column insertion plate (41) is consistent with the crossbeam web (12).

6. The connection node for the upper module of FPSO according to claim 3, characterized in that: A fixing plate (7) is fixedly arranged in a vertical plane of the cross beam web (12) and the longitudinal beam web (22); one end of the fixing plate (7) is fixedly connected to the cross beam web (12), and the other end of the fixing plate (7) is fixedly connected to the longitudinal beam web (22).

7. The connection node for the upper module of FPSO according to claim 4, characterized in that: A diagonal brace insertion plate (9) is fixedly arranged in a plane formed by the upper flange (11) of the cross beam and the web (32) of the column. One side of the diagonal brace insertion plate (9) is fixedly connected to the upper flange (11) of the cross beam, and the other side of the diagonal brace insertion plate (9) is fixedly connected to the left flange (33) of the column. In a plane perpendicular to the above plane, the diagonal brace insertion plate (9) is aligned with the web (22) of the longitudinal beam, and the lower surface of the insertion plate reinforcement rib (34) is fixedly connected to the upper surface of the diagonal brace insertion plate (9).

8. The connection node for the upper module of FPSO according to claim 7, characterized in that: The diagonal brace (5) is obliquely inserted and fixedly arranged on the diagonal brace insertion plate (9), and limiting blocks (91) are fixedly arranged on both sides of one end of the diagonal brace insertion plate (9).

9. The connection node for the upper module of FPSO according to claim 1, characterized in that: The support portion (6) comprises a sliding plate (61) slidably mounted on an upper flange (11) of a cross beam or an upper flange (21) of a longitudinal beam, a connecting rod (62) being fixedly arranged on the top of the sliding plate (61), one end of the connecting rod (62) being fixedly connected to a supporting plate (63) for supporting the diagonal brace (5), the upper surface of the supporting plate (63) being arc-shaped, and screws (64) being fixedly arranged on both sides of the sliding plate (61).

10. A method for connecting a connection node for an FPSO upper module, used for the connection node for an FPSO upper module according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, vertically staggering and fixing the cross beam (1) and the longitudinal beam (2) to form a whole, and fixing the fixing plate (7) in a vertical plane between the cross beam (1) and the longitudinal beam (2); S2. The column (3) is fixedly mounted on the top of the beam (1) by means of diagonal brace insertion plates (9) in all directions, and the diagonal brace (5) is fixedly mounted on the diagonal brace insertion plates (9); S3, the column support rib plate (8) is fixedly connected between the upper flange (11) of the beam and the lower flange (13) of the beam, and the insert plate reinforcement rib (34) is fixedly connected between the left flange (33) of the column and the right flange (31) of the column; S4, sliding the sliding plate (61) on the upper flange of the cross beam (11) and the upper flange of the longitudinal beam (21), so that the support plate (63) is tightly connected to the diagonal brace (5), and fixing the sliding plate (61) by screws (64) to form an overall upper module; S5. The upper module is hoisted above the leg column (4), and the leg column (4) is fixedly connected to the lower surface of the lower flange (13) of the cross beam through the leg column insertion plate (41), so as to form the main frame of the upper module of the FPSO.

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