A large-diameter suction cylinder construction process for offshore wind power jacket

Abstract

The application relates to a large-diameter suction cylinder construction process of an offshore wind power jacket, and the specific steps comprise the following steps: S1, coiling a circular arc plate body; S2, manufacturing a single cylinder section; S3, constructing a lower section structure of the suction cylinder; S4, manufacturing a jacket leg assembly; S5, constructing an upper section structure of the suction cylinder; S6, constructing folding; S7, inner seam welding; and S8, paint spraying. The application has the following advantages: the cylinder section is manufactured by a piece-by-piece and section-by-section method, and a longitudinal assembly alignment splicing mode is adopted, so that the roundness during cylinder section welding is guaranteed, and the splicing perpendicularity and the structural strength of the suction cylinder are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of tubular pile on-ship transportation, and particularly relates to a large-diameter suction cylinder construction process for offshore wind power jacket. BACKGROUND

[0002] In the construction of offshore wind power, the construction of wind power jacket foundation is an important work in offshore wind farm engineering. Due to the large volume and weight of offshore wind power jacket foundation, a large amount of manpower, material resources and time cost are often consumed in the manufacturing process. The offshore wind power jacket foundation mainly consists of a suction cylinder, a main structure and a transition section.

[0003] The suction cylinder consists of a cylinder and a jacket leg assembly arranged at the upper end of the cylinder. The cylinder is composed of multiple cylinder segments. The cylinder has a diameter of 14-15 m, a plate thickness of 26-30 mm and a height of 16-18 m. The diameter is large, and the plate body is thin. The current construction process of the suction cylinder includes: the cylinder segments are formed by being integrally rolled by a plate rolling machine, the rolled cylinder segments are placed on a roller frame for axial assembly welding, and finally the cylinder segments are welded with the jacket leg assembly. The existing construction process has the following defects: 1. Due to the large diameter and thin plate body of the cylinder segment, deformation is prone to occur during the integral rolling by the plate rolling machine, which cannot guarantee the roundness of the cylinder segment, and it is difficult to assemble the cylinder segment axially; 2. The end surfaces of two adjacent cylinder segments are in contact to form an annular gap when they are placed on the roller frame for axial assembly. The rollers on the roller frame rotate to drive the two cylinder segments to rotate synchronously in a circle, thereby realizing the welding of the annular gap. However, due to the gravity of the cylinder segment, the outer wall of the cylinder segment is concave towards the center when it is placed axially on the roller frame, and the cylinder segment is prone to deformation. When the cylinder segment rotates, the trajectory is an ellipse. Therefore, the welding end of the welding gun cannot always maintain consistent spacing with the annular gap between the two adjacent cylinder segments, which affects the verticality of the splicing of the multiple cylinder segments and the structural strength. SUMMARY

[0004] The purpose of the present application is to overcome the above shortcomings and provide a large-diameter suction cylinder construction process for offshore wind power jacket. The cylinder segment is made by the piece-by-piece and segment-by-segment method, and the longitudinal assembly alignment splicing method is adopted to guarantee the roundness of the cylinder segment during welding and the verticality of the splicing of the suction cylinder and the structural strength.

[0005] The purpose of the present application is achieved by the following technical solution: a large-diameter suction cylinder construction process for offshore wind power jacket. The suction cylinder includes a jacket leg assembly and multiple cylinder segments arranged from top to bottom. The cylinder segment at the upper end and the jacket leg assembly form the upper segment structure of the suction cylinder, and the remaining multiple cylinder segments form the lower segment structure of the suction cylinder. The suction cylinder is constructed by splicing the lower segment structure first, then splicing the upper segment structure, and finally folding and fixing the upper segment structure and the lower segment structure. The specific steps include:

[0006] S1, roll the arc plate body: roll the arc plate body, the roundness of the arc plate body is detected by the sample plate during the rolling process, the sample plate is placed on the inner and outer sides of the arc plate body, and the gap between the sample plate and the arc plate body is not greater than 1mm;

[0007] S2, make a single cylinder section: place multiple arc plate bodies in a circular shape on the splicing and assembling alignment equipment, the splicing and assembling alignment equipment tightens the inside and outside of the multiple arc plate bodies to ensure the circularity of the single cylinder section before welding, weld the outside longitudinal seam between the two adjacent arc plate bodies to preliminarily connect and form a first cylinder section, remove the first cylinder section for later use, and make another first cylinder section on the splicing and assembling alignment equipment without changing the position;

[0008] S3, build the lower section structure of the suction cylinder: place multiple arc plate bodies in a circular shape on the upper end face of the first cylinder section connected with the splicing and assembling alignment equipment, correct the verticality of the plumb line, measure the misalignment of the longitudinal seam, and the misalignment d of the upper and lower cylinder sections is ≤t / 10 and ≤3mm, where t is the thickness of the arc plate body, adjust the misalignment, tighten the inside and outside of the first cylinder section and the multiple arc plate bodies above it through the splicing and assembling alignment equipment, point weld at equal intervals at the outside ring seam between the first cylinder section and the multiple arc plate bodies above it, weld the outside longitudinal seam between the two adjacent arc plate bodies above the first cylinder section in sequence to form a second cylinder section, and weld the outside ring seam between the first cylinder section and the second cylinder section, according to the above steps, make the remaining cylinder sections on the second cylinder section in sequence, and finally complete the construction of the lower section structure of the suction cylinder;

[0009] S4, make the jacket leg assembly: assemble the jacket leg, the inner stiffening ring, the top plate one and the web plate one to form assembly A, assemble the top plate two and the web plate two to form multiple assembly B, and assemble assembly A and multiple assembly B on the circular plate to form the jacket leg assembly;

[0010] S5, build the upper section structure of the suction cylinder: hoist the jacket leg assembly in step S4 to the first cylinder section removed in step S2, weld after keeping the joint flush;

[0011] S6, build the closure: hoist the upper section structure of the suction cylinder to the position directly above the lower section structure of the suction cylinder, the splicing and assembling alignment equipment tightens and aligns the two cylinder sections in contact with the upper section structure of the suction cylinder and the lower section structure of the suction cylinder, and welds the outside ring seam of the two cylinder sections in contact, completing the closure of the suction cylinder;

[0012] S7, inner seam welding: disassemble the splicing and assembling alignment equipment, and weld and fix the inside longitudinal seam and the inside ring seam in the suction cylinder in sequence;

[0013] S8, paint spraying: spray paint on the outside and inside of the suction cylinder.

[0014] The further improvement of the present application is that the splicing assembly alignment device comprises a supporting base, the supporting base is provided with an inner supporting structure and an outer clamping structure, a plurality of arc plate bodies of each cylinder section are arranged between the inner supporting structure and the outer clamping structure, a first hydraulic cylinder vertically arranged between the bottom of the inner supporting structure and the outer clamping structure and the supporting base, and the first hydraulic cylinder drives the inner supporting structure and the outer clamping structure to move up and down.

[0015] The further improvement of the present application is that the specific steps of welding the second cylinder section above the first cylinder section in step S3 comprise that the first hydraulic cylinder lifts the inner supporting structure and the outer clamping structure, so that the ring gap between the first cylinder section and the second cylinder section is in contact with the inner supporting structure and the outer clamping structure, the plurality of arc plate bodies of the second cylinder section are preliminarily positioned on the first cylinder section through spot welding, the first hydraulic cylinder continues to lift, so that the inner supporting structure and the outer clamping structure are in contact with the inner and outer walls of the second cylinder section, and after the outer ring gap of the first cylinder section and the second cylinder section is welded, the outer longitudinal gap of the second cylinder section is welded.

[0016] The further improvement of the present application is that the inner supporting structure comprises a disc body and a plurality of equidistantly distributed limiting grooves arranged on the disc body, the driving end of the first hydraulic cylinder is fixedly connected with the disc body, the limiting grooves extend from the side end of the disc body to the center of the disc body, a telescopic plate is embedded in the limiting groove, one end of the telescopic plate extends to the outside of the disc body in a direction away from the center of the disc body and the end of the telescopic plate is fixedly connected with an arc block, the opening of the arc block is arranged in a direction towards the center of the disc body, and the plurality of arc blocks are expanded or contracted synchronously through a driving assembly.

[0017] The further improvement of the present application is that the driving assembly comprises a first meshing gear arranged at the center of the disc body and a second meshing gear in meshing transmission with the first meshing gear, each telescopic plate is provided with a limiting column, the first meshing gear is provided with a plurality of arc-shaped through holes through which the limiting columns are arranged, the centers of the first meshing gear and the second meshing gear are fixedly connected with rotating shafts, the rotating shafts penetrate through the disc body and are movably connected with the disc body, the rotating shaft connected with the second meshing gear is connected with a speed reducer, the speed reducer is started to drive the first meshing gear and the second meshing gear to transmit, so that the plurality of limiting columns synchronously slide in the corresponding arc-shaped through holes, thereby realizing synchronous expansion or contraction of the plurality of arc blocks.

[0018] The further improvement of the present application is that the inner walls of the two sides of the limiting groove are provided with grooves recessed inward, the extension direction of the groove is consistent with the extension direction of the limiting groove, and the two side ends of the telescopic plate are embedded in the corresponding grooves and move in the corresponding grooves under the driving of the driving assembly.

[0019] Further improvement of the present application is that the outer clamping structure comprises a plurality of arc-shaped support parts distributed on the outer side of the disc body, the plurality of arc-shaped support parts are distributed at equal intervals along the circumference, the arc-shaped support parts are connected with the support base through first hydraulic cylinders, the arc-shaped support parts and the corresponding cylindrical segment arc plate bodies are connected through a plurality of second hydraulic cylinders, the driving end of the second hydraulic cylinder is connected with a clamping pad in contact with the arc plate body, and the plurality of second hydraulic cylinders are vertically distributed on the outer side of the arc plate body.

[0020] Further improvement of the present application is that in step S3, the longitudinal seams of the two adjacent cylindrical segments are staggered by 60°.

[0021] Further improvement of the present application is that in steps S2 to S7, the welding is symmetrically welded from the middle to both ends by multiple people, and the segmented jump back welding is performed.

[0022] Further improvement of the present application is that in step S4, the assembly A is placed at the center position of the circular plate, and the assembly B is distributed at equal intervals along the circumference and is fixedly connected with the circular plate.

[0023] Further improvement of the present application is that after the completion of each cylindrical segment, the local concave-convex degree of the end face of the cylindrical segment is detected by a template, the edge distance E between the edge of the template and the edge of the cylindrical segment is less than or equal to 0.1t+1 and less than or equal to 3mm.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] The present application cancels the traditional whole rolling cylindrical segment and the axial assembly splicing mode, and the cylindrical segment is made by the piece-by-piece method, and the splicing mode of longitudinal assembly alignment is adopted, so that the roundness of the cylindrical segment during welding is ensured, and the plurality of arc plate bodies of the single cylindrical segment are spliced and aligned by the splicing assembly alignment equipment, so that the roundness of the cylindrical segment during welding is further ensured, and the roundness of the cylindrical segment is ensured from the manufacturing of the cylindrical segment to the splicing assembly of the cylindrical segment, so that the splicing perpendicularity and the structural strength of the suction cylinder are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the position of the suction cylinder in the wind power guide pipe frame in the present application.

[0027] Figure 2 It is a structural schematic diagram of the suction cylinder in the present application.

[0028] Figure 3 It is a structural schematic diagram of the arc plate body in step S1 of the present application.

[0029] Figure 4 It is a structural schematic diagram of assembly A in the present application.

[0030] Figure 5 It is a structural schematic diagram of assembly B in the present application.

[0031] Figure 6 Structure diagram of the pipe rack leg assembly in the application.

[0032] Figure 7 Structure diagram of the upper section of the suction cylinder in the application.

[0033] Figure 8 Structure diagram of the lower section of the suction cylinder in the application.

[0034] Figure 9 Structure diagram of the splicing assembly alignment device in the application.

[0035] Figure 10 Structure diagram of the inner support structure in the application. Figure 9 Structure diagram of the inner support structure in the application.

[0036] Figure 11 Structure diagram of the inner support structure in the application. Figure 9 Structure diagram of the inner support structure in the application.

[0037] Figure 12 Structure diagram of the inner support structure in the application. Figure 11 Structure diagram of the inner support structure in the application.

[0038] Figure mark:

[0039] 1-pipe rack leg assembly, 2-cylinder section, 3-upper section of the suction cylinder, 4-lower section of the suction cylinder, 5-circular arc plate body, 6-splicing assembly alignment device, 7-outer longitudinal seam, 8-outer ring seam;

[0040] 11-assembly A, 12-assembly B, 13-circular plate; 111-pipe rack leg, 112-leg inner reinforcing ring, 113-top plate one, 114-web one; 121-top plate two, 122-web two;

[0041] 61-support base, 62-inner support structure, 63-outer clamping structure, 64-first hydraulic cylinder; 621-disc body, 622-limiting groove, 623-telescopic plate, 624-circular arc block, 625-driving assembly; 6251-first meshing gear, 6252-second meshing gear, 6253-limiting column, 6254-arc-shaped through hole, 6255-rotation shaft, 6257-slot. DETAILED DESCRIPTION

[0042] In order to deepen the understanding of the application, the application will be further described below in combination with the embodiments and the drawings, which are only used to explain the application and do not constitute a limitation on the protection scope of the application.

[0043] In the description of the present application, it should be understood that the terms indicating the position or positional relationship, such as the position or positional relationship shown in the drawings, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure or unit referred to must have a particular position, and therefore cannot be understood as a limitation on the present application.

[0044] In the present application, unless otherwise specifically stated and limited, terms such as "connected", "provided with", "have" and the like should be broadly understood, for example, they can be fixedly connected, detachably connected, or integrally connected, which can be mechanically connected or directly connected, or connected through an intermediate medium. For those skilled in the art, the basic meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] A large-diameter suction cylinder construction process for an offshore wind power jacket, as shown in Figure 1 、 Figure 2 , the suction cylinder comprises a jacket leg assembly 1 and a plurality of cylinder segments 2 arranged in sequence from top to bottom, one cylinder segment 2 at the upper end and the jacket leg assembly 1 form a suction cylinder upper segment structure 3, and the remaining plurality of cylinder segments 2 form a suction cylinder lower segment structure 4. The suction cylinder is constructed by first assembling the suction cylinder lower segment structure 4, then assembling the suction cylinder upper segment structure 3, and finally folding and fixing the suction cylinder upper segment structure 3 and the suction cylinder lower segment structure 4. The specific steps include:

[0046] S1, coiling the circular arc plate body 5: as shown in Figure 3 , the plate coiling machine coils a plurality of circular arc plate bodies 5. During the coiling process, the roundness of the circular arc plate body 5 is detected by a sample plate. When checking, the sample plate is placed on the inner and outer sides of the circular arc plate body 5, and the gap between the sample plate and the circular arc plate body 5 is not greater than 1mm;

[0047] S2, making a single cylinder segment 2: placing a plurality of circular arc plate bodies 5 in a circular shape on the splicing and assembling alignment equipment 6, and splicing and assembling the alignment equipment 6 to tightly clamp the inside and outside of the plurality of circular arc plate bodies 5 to ensure the circularity of the single cylinder segment 2 before welding. The outer side longitudinal seam 7 between the two adjacent circular arc plate bodies 5 is welded to preliminarily connect to form a first cylinder segment. The first cylinder segment is removed for later use, and another first cylinder segment is made on the splicing and assembling alignment equipment 6 without changing the position.

[0048] S3, constructing the suction cylinder lower segment structure: as shown in Figure 8 、 Figure 9As shown, a plurality of circular arc plate bodies 5 are longitudinally arranged on the upper end face of the first cylinder segment connected with the splicing assembly alignment device 6 in step S2 to form a circular structure, the plumb line is corrected to be vertical, the misalignment of the longitudinal joint is measured, the misalignment d of the upper and lower two cylinder segments is ≤t / 10 and ≤3mm, wherein t is the thickness of the circular arc plate body 5, after adjustment, the inner and outer top is tightened through the splicing assembly alignment device 6, the point welding is performed at the outer ring joint 8 formed by the first cylinder segment and the plurality of circular arc plate bodies 5 above the first cylinder segment, the welding is sequentially performed on the outer longitudinal joint 7 between the adjacent two circular arc plate bodies 5 above the first cylinder segment to form the second cylinder segment, and the welding is performed on the outer ring joint 8 between the first cylinder segment and the second cylinder segment, according to the above steps, the remaining cylinder segments 2 are sequentially manufactured on the second cylinder segment, and finally the construction of the lower section structure 4 of the suction cylinder is completed.

[0049] S4, manufacturing of the jacket leg assembly 1: as shown, Figures 4 to 6 the jacket leg 111, the inner leg reinforcing ring 112, the top plate one 113 and the web plate one 114 are assembled to form an assembly A11, the top plate two 121 and the web plate two 122 are assembled to form a plurality of assemblies B12, and the assembly A11 and the plurality of assemblies B12 are assembled on the circular plate 13 to form the jacket leg assembly 1.

[0050] S5, construction of the upper section structure 3 of the suction cylinder: as shown, Figure 7 the first cylinder segment taken out in step S2 is hoisted to the jacket leg assembly 1 in step S4, and the welding is performed after the abutment is kept flush.

[0051] S6, construction of the closure: the upper section structure 3 of the suction cylinder is hoisted to the position directly above the lower section structure 4 of the suction cylinder, the splicing assembly alignment device 6 is used to tightly align the two cylinder segments 2 in contact with each other between the upper section structure 3 of the suction cylinder and the lower section structure 4 of the suction cylinder, and the welding is performed on the outer ring joint 8 of the two cylinder segments 2 in contact with each other, and the closure of the suction cylinder is completed.

[0052] S7, inner joint welding: the splicing assembly alignment device 6 is disassembled, and the inner longitudinal joint and the inner ring joint in the inner part of the suction cylinder are sequentially welded and fixed.

[0053] S8, paint spraying: the outer part and the inner part of the suction cylinder are subjected to paint spraying treatment.

[0054] The present application cancels the traditional whole rolling cylinder segment 2 and then assembles and splices the cylinder segment 2 in the axial direction, the cylinder segment is manufactured by the segmentation method, the splicing method of longitudinal assembly alignment is adopted, the circularity of the cylinder segment 2 during welding is ensured, the splicing assembly alignment device 6 is used to splice and align the plurality of circular arc plate bodies 5 of the single cylinder segment 2, and the circularity of the cylinder segment 2 during welding is further ensured, the circularity of the cylinder segment 2 is ensured from the manufacturing of the cylinder segment 2 to the splicing assembly of the cylinder segment, and the verticality and the structural strength of the splicing of the suction cylinder are ensured.

[0055] On the basis of the embodiment, as shown in Figure 9 The splicing assembly alignment device 6 includes a support base 61, the support base 61 has an inner top support structure 62 and an outer clamping structure 63, a plurality of arc plate bodies 5 of each cylinder section 2 are arranged between the inner top support structure 62 and the outer clamping structure 63, the bottom of the inner top support structure 62 and the outer clamping structure 63 and the support base 61 are provided with a first hydraulic cylinder 64 arranged vertically, and the first hydraulic cylinder 64 drives the inner top support structure 62 and the outer clamping structure 63 to ascend and descend.

[0056] Further, in step S3, before the equal-interval spot welding is performed at the outer side ring seam 8 formed by the first cylinder section and the plurality of arc plate bodies 5 above the first cylinder section, the first hydraulic cylinder 64 lifts the inner top support structure 62 and the outer clamping structure 63, so that the ring seam between the first cylinder section and the second cylinder section is in contact with the inner top support structure 62 and the outer clamping structure 63, thereby playing a role of positioning and clamping the plurality of arc plate bodies 5 above the first cylinder section, and further ensuring the perpendicularity of the first cylinder section and the second cylinder section before welding. The plurality of arc plate bodies 5 of the second cylinder section are preliminarily positioned on the first cylinder section through spot welding, the first hydraulic cylinder 64 continues to lift, so that the inner top support structure 62 and the outer clamping structure 63 are in contact with the inner and outer walls of the second cylinder section, respectively, and after the outer side ring seam 8 of the first cylinder section and the second cylinder section is welded, the outer side longitudinal seam 7 of the second cylinder section is welded.

[0057] It should be noted that the arc plate body 5 is an open structure, and the positions of the two sides of the arc plate body 5 are prone to welding shrinkage during welding. Therefore, the positions of the two ends of the longitudinal seam of the adjacent two arc plate bodies 5 are deformed, causing the change of the curvature, and it is difficult to ensure the assembly precision when the plurality of cylinder sections 2 are assembled subsequently. However, the splicing assembly alignment device 6 in the present application effectively solves the technical problem of deformation of the longitudinal seam of the plurality of arc plate bodies 5 during welding, and the setting of the splicing assembly alignment device 6 further improves the vertical precision of the longitudinal assembly of the adjacent two cylinder sections 2.

[0058] On the basis of the embodiment, as shown in Figure 10 , Figure 11 The inner top support structure 62 includes a disc body 621 and a plurality of limiting grooves 622 arranged at equal intervals on the disc body 621, the driving end of the first hydraulic cylinder 64 is fixedly connected with the disc body 621, the limiting grooves 622 extend from the side end of the disc body 621 to the center of the disc body 621, a telescopic plate 623 is embedded in the limiting groove 622, one end of the telescopic plate 623 extends to the outside of the disc body 621 in a direction away from the center of the disc body 621 and is fixedly connected with an arc block 624 at the end, the opening of the arc block 624 is arranged to face the center of the disc body 621, and the plurality of arc blocks 624 realize synchronous expansion or contraction through a driving assembly 625.

[0059] On the basis of the embodiment, the driving assembly 625 comprises a first meshing gear 6251 arranged at the center of the disc body 621 and a second meshing gear 6252 in meshing transmission with the first meshing gear 6251, each telescopic plate 623 is provided with a limiting column 6253, the first meshing gear 6251 is provided with a plurality of arc-shaped through holes 6254 through which the limiting columns 6253 are arranged, the centers of the first meshing gear 6251 and the second meshing gear 6252 are fixedly connected with a rotating shaft 6255, the rotating shaft 6255 penetrates through the disc body 621 and is movably connected with the disc body 621, the rotating shaft 6255 connected with the second meshing gear 6252 is connected with a speed reducer motor, the speed reducer motor is started to drive the first meshing gear 6251 and the second meshing gear 6252 to transmit, so that the plurality of limiting columns 6253 synchronously slide in the corresponding arc-shaped through holes 6254, thereby realizing the synchronous expansion or contraction of the plurality of arc blocks 624.

[0060] In the present application, the plurality of arc blocks 624 of the inner supporting structure 62 are synchronously expanded under the action of the driving assembly 625, so as to realize the supporting of the plurality of arc plate bodies 5, and the plurality of arc blocks 624 are synchronously contracted under the action of the driving assembly 625, so as to cancel the supporting of the plurality of arc plate bodies 5.

[0061] Further, as shown in Figure 12 The two side walls of the limiting groove 622 are provided with a groove 6257 recessed inward, the extending direction of the groove 6257 is consistent with the extending direction of the limiting groove 622, and the two side ends of the telescopic plate 623 are embedded in the corresponding groove 6257 and move in the corresponding groove 6257 under the driving of the driving assembly 625.

[0062] The two side ends of the telescopic plate 623 are embedded in the groove 6257 of the limiting groove 622, which facilitates the straightness of the telescopic plate 623 during the telescopic movement, thereby ensuring the synchronous expansion and contraction of the plurality of arc blocks 624.

[0063] On the basis of the embodiment, the outer clamping structure 63 comprises a plurality of arc-shaped supporting portions 631 distributed on the outer side of the disc body 621, the plurality of arc-shaped supporting portions 631 are circumferentially distributed at equal intervals, the arc-shaped supporting portion 631 is connected with the supporting base 61 through the first hydraulic cylinder 64, the arc-shaped supporting portion 631 and the arc plate body 5 of the corresponding cylinder section 2 are connected through a plurality of second hydraulic cylinders 632, the driving end of the second hydraulic cylinder 632 is connected with a clamping pad 633 in contact with the arc plate body 5, and the plurality of second hydraulic cylinders 632 are vertically distributed at the outer side of the arc plate body 5.

[0064] The outer clamping structure 63 cooperates with the inner supporting structure 62 to make the outer wall of the arc plate body 5 subjected to the inward extrusion force and the inner wall subjected to the outward thrust, thereby ensuring the roundness of the arc plate body 5.

[0065] It should be noted that in step S3, the longitudinal seams of the two adjacent cylinder segments 2 are staggered by 60°, so that the longitudinal seams of the two adjacent cylinder segments are staggered in turn, avoiding the concentration of welding thermal stress, effectively dispersing the thermal stress effect, and ensuring the structural strength of the lower section structure 4 of the suction cylinder.

[0066] Further, in steps S2 to S7, the welding is symmetrically welded from the middle to the two ends by multiple people, and the section jumps back.

[0067] Further, in step S4, the assembly A11 is placed at the center position of the circular plate 13, and the assemblies B12 are circumferentially distributed on the outer circumference of the assembly A11 and are fixedly connected with the circular plate 13.

[0068] Further, after the completion of each cylinder segment 2, the local concave-convex degree of the end face of the cylinder segment 2 is detected by a template, the edge distance E between the edge of the template and the edge of the cylinder segment is ≤0.1t+1 and E≤3mm.

[0069] Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A large diameter suction caisson construction process for offshore wind turbine jacket foundations, characterized by: The suction cylinder comprises a guide pipe support leg assembly (1) and a plurality of cylinder segments (2) arranged in sequence from top to bottom, a cylinder segment (2) at the upper end and the guide pipe support leg assembly (1) form a suction cylinder upper segment structure (3), and the remaining plurality of cylinder segments (2) form a suction cylinder lower segment structure (4), the suction cylinder is constructed by firstly splicing the suction cylinder lower segment structure (4), then splicing the suction cylinder upper segment structure (3), and finally folding and fixing the suction cylinder upper segment structure (3) and the suction cylinder lower segment structure (4), and the specific steps include: S1, roll the circular arc plate body (5): the plate rolling machine rolls a plurality of circular arc plate bodies (5), and the roundness of the circular arc plate body (5) is detected by a template during the rolling process; when checking, the template is placed on the inner and outer sides of the circular arc plate body (5), and the gap between the template and the circular arc plate body (5) is not greater than 1mm; S2, make a single cylinder segment (2): place a plurality of circular arc plate bodies (5) in a circular shape on the splicing and assembling alignment equipment (6) to form a circular shape structure, the splicing and assembling alignment equipment (6) is used to tightly press the inner and outer sides of the plurality of circular arc plate bodies (5) to ensure the circularity of the single cylinder segment (2) before welding, the outer side longitudinal seam (7) between the adjacent two circular arc plate bodies (5) is welded, a first cylinder segment is preliminarily connected, the first cylinder segment is taken out for later use, and another first cylinder segment is made on the splicing and assembling alignment equipment (6) without changing the position; S3, build the suction cylinder lower segment structure: place a plurality of circular arc plate bodies (5) in a circular shape on the upper end surface of the first cylinder segment connected with the splicing and assembling alignment equipment (6) to form a circular shape structure, correct the verticality of the plumb line, measure the butt joint gap of the longitudinal seam, and the gap d between the upper and lower cylinder segments is ≤t / 10 and ≤3mm, wherein t is the thickness of the circular arc plate body (5); after adjustment, the inner and outer sides are tightly pressed by the splicing and assembling alignment equipment (6), the outer side ring seam (8) between the first cylinder segment and the plurality of circular arc plate bodies (5) above the first cylinder segment is point welded at equal intervals, the outer side longitudinal seam (7) between the adjacent two circular arc plate bodies (5) above the first cylinder segment is sequentially welded to form a second cylinder segment, and the outer side ring seam (8) between the first cylinder segment and the second cylinder segment is welded; according to the above steps, the remaining cylinder segments (2) are sequentially made on the second cylinder segment, and finally the construction of the suction cylinder lower segment structure (4) is completed; S4, make the guide pipe support leg assembly (1): assemble the guide pipe support leg (111), the inner leg reinforcing ring (112), the top plate one (113) and the web one (114) to form the assembly A (11), assemble the top plate two (121) and the web two (122) to form a plurality of assembly B (12), and assemble the assembly A (11) and the plurality of assembly B (12) on the circular plate (13) to form the guide pipe support leg assembly (1); S5, build the suction cylinder upper segment structure (3): hoist the guide pipe support leg assembly (1) in step S4 on the first cylinder segment taken out in step S2, weld after keeping the butt joint flush. S6, build closure: hoist the upper section structure (3) of the suction cylinder to the position directly above the lower section structure (4) of the suction cylinder, the splicing assembly alignment equipment (6) tightly aligns the two cylinder sections (2) in contact with the upper section structure (3) and the lower section structure (4) of the suction cylinder, and welds the outer side ring seams (8) of the two cylinder sections (2) in contact, completing the closure of the suction cylinder; S7, inner seam welding: disassemble the splicing assembly alignment equipment (6), and sequentially weld and fix the inner side longitudinal seams and the inner side ring seams in the inside of the suction cylinder; S8, paint spraying: paint spraying treatment is performed on the outside and the inside of the suction cylinder; The splicing assembly alignment equipment (6) comprises a supporting base (61), the supporting base (61) is provided with an inner jacking structure (62) and an outer clamping structure (63) thereon, a plurality of arc plate bodies (5) of each cylinder section (2) are arranged between the inner jacking structure (62) and the outer clamping structure (63), and a first hydraulic cylinder (64) vertically arranged between the bottom of the inner jacking structure (62) and the outer clamping structure (63) and the supporting base (61) is arranged. In the step S3, the specific steps of welding the second cylinder section above the first cylinder section comprise the following steps: the first hydraulic cylinder (64) jacks up the inner jacking structure (62) and the outer clamping structure (63), so that the ring seam between the first cylinder section and the second cylinder section is in contact with the inner jacking structure (62) and the outer clamping structure (63), the plurality of arc plate bodies (5) of the second cylinder section are preliminarily positioned on the first cylinder section through spot welding, the first hydraulic cylinder (64) continues to jack up, so that the inner jacking structure (62) and the outer clamping structure (63) are in contact with the inner and outer walls of the second cylinder section respectively, the outer side ring seam (8) of the first cylinder section and the second cylinder section is welded, and then the outer side longitudinal seam (7) of the second cylinder section is welded.

2. A process for the construction of large diameter suction caissons for offshore wind turbine jackets according to claim 1, characterized in that: The inner jacking structure (62) comprises a disc body (621) and a plurality of equidistant circumferentially distributed limiting grooves (622) arranged on the disc body (621), the driving end of the first hydraulic cylinder (64) is fixedly connected with the disc body (621), the limiting grooves (622) extend from the side end of the disc body (621) to the center of the disc body (621), a telescopic plate (623) is embedded in the limiting groove (622), one end of the telescopic plate (623) extends to the outside of the disc body (621) in a direction away from the center of the disc body (621), and the end of the telescopic plate (623) is fixedly connected with an arc block (624), the opening of the arc block (624) is arranged towards the center of the disc body (621), and a plurality of arc blocks (624) realize synchronous expansion or contraction through a driving assembly (625).

3. A process for the construction of a large diameter suction bucket foundation for offshore wind turbines according to claim 2, characterized in that: The driving assembly (625) comprises a first meshing gear (6251) arranged at the center of the disc body (621) and a second meshing gear (6252) in meshing transmission with the first meshing gear (6251), each telescopic plate (623) is provided with a limiting column (6253), the first meshing gear (6251) is provided with a plurality of arc-shaped through holes (6254) through which the limiting columns (6253) are arranged, the centers of the first meshing gear (6251) and the second meshing gear (6252) are fixedly connected with rotating shafts (6255), the rotating shafts (6255) penetrate through the disc body (621) and are movably connected with the disc body (621), the rotating shaft (6255) connected with the second meshing gear (6252) is connected with a speed reducer motor, the speed reducer motor drives the first meshing gear (6251) and the second meshing gear (6252) to transmit, so that the plurality of limiting columns (6253) synchronously slide in the corresponding arc-shaped through holes (6254), thereby realizing the synchronous expansion or contraction of the plurality of arc blocks (624).

4. A process for the construction of large diameter suction caissons for offshore wind turbine jackets according to claim 3, characterized in that: The two side inner walls of the limiting groove (622) are provided with inwardly recessed notches (6257), the extending direction of the notches (6257) is consistent with the extending direction of the limiting groove (622), and the two side ends of the telescopic plate (623) are embedded in the corresponding notches (6257) and move in the corresponding notches (6257) under the driving of the driving assembly (625).

5. A process for the construction of large diameter suction caissons for offshore wind turbine jackets according to claim 4, characterized in that: The outer clamping structure (63) comprises a plurality of arc-shaped supporting parts (631) distributed on the outer side of the disc body (621), the plurality of arc-shaped supporting parts (631) are circumferentially distributed at equal intervals, the arc-shaped supporting parts (631) and the supporting base (61) are connected through first hydraulic cylinders (64), the arc-shaped supporting parts (631) and the arc-shaped plate bodies (5) of the corresponding cylinder segments (2) are connected through a plurality of second hydraulic cylinders (632), the driving ends of the second hydraulic cylinders (632) are connected with clamping pads (633) in contact with the arc-shaped plate bodies (5), and the plurality of second hydraulic cylinders (632) are vertically distributed on the outer side of the arc-shaped plate bodies (5).

6. A process for the construction of a large diameter suction bucket foundation for an offshore wind turbine jacket according to claim 5, characterized in that: In the step S3, the longitudinal seams of the two cylinder segments (2) adjacent to each other are staggered by 60°.

7. A process for the construction of a large diameter suction caisson for an offshore wind turbine jacket according to claim 6, characterized in that: In the steps S2 to S7, the welding is symmetrically welded from the middle to the two ends by multiple people, and the segmented jump back welding is performed.

8. A process for the construction of a large diameter suction bucket of an offshore wind turbine jacket according to claim 7, characterized in that: In the step S4, the assembly A (11) is arranged at the center of the circular plate (13), and the assembly B (12) is circumferentially distributed on the outer circumference of the assembly A (11) and fixedly connected with the circular plate (13).

9. A process for the construction of a large diameter suction pile for an offshore wind turbine jacket according to claim 8, characterized in that: After the manufacture of each cylinder segment (2) is completed, the local concave-convex degree of the end face of the cylinder segment (2) is detected through a template, the edge spacing E between the edge of the template and the edge of the cylinder segment is less than or equal to 0.1t+1 and less than or equal to 3mm.

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