A method for erecting a hull sub-assembly

Abstract

The application discloses a kind of hull three-dimensional secondary middle assembly manufacturing method.The method includes in the early stage of ship design, according to detailed assembly essentials and existing basic resources, process flow and product structure characteristics, the assembly range of secondary middle assembly is determined and defined, the assembly drawing of secondary middle assembly is designed for the assembly range of secondary middle assembly, the special part coding, special flow direction code, part tray inventory and part channeling drawing are designed, the part channeling is discharged according to engineering stage demand, and according to the special flow direction code and part tray inventory of secondary middle assembly, the part is channelled and allocated, the assembly of T profile, small forming and large forming is completed, the special lifting mode and assembly positioning reinforcement tooling are designed, and the assembly of secondary middle assembly is completed with the aid of automatic welding equipment, and finally the installation of outfitting parts is completed and sent to the section assembly platform.The application shortens the time of moulding, and the lifting and assembly mode is more efficient.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, specifically to a method for assembling and fabricating a three-dimensional secondary hull. Background Technology

[0002] Shipbuilding typically divides the hull into several sections, which are further divided into several components. Components are mainly divided into small assembly and medium assembly. However, due to different facilities, sites, resources, and habitual processes in shipyards, there is no clear boundary between small and medium assembly. In order to further improve production efficiency and reduce the time spent on the hull of sections, it is urgent to create a new three-dimensional secondary medium assembly manufacturing method based on the existing production mode and resources of shipyards. This method should clarify the composition structure and scope of the assembly, define the assembly, hoisting, and assembly methods, and improve production efficiency. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for manufacturing a three-dimensional secondary assembly of a ship hull that allows for earlier fabrication time, definition of each component, and clear methods for hoisting and assembly.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a method for assembling and manufacturing a three-dimensional secondary hull, comprising the following steps:

[0005] S1: In the early stages of ship design, the assembly scope of the secondary assembly is determined and defined based on detailed assembly guidelines, existing basic resources, technological processes, and product structural characteristics.

[0006] The definition of secondary assembly comes from the following sources: site equipment and facilities, subsequent assembly requirements for detailed assembly, production and distribution requirements, temporary reinforcement safety requirements, hoisting safety requirements, turning tooling safety requirements, and precision control requirements.

[0007] S2: Design secondary assembly drawings for the assembly scope of secondary assembly, and design special part codes, special flow codes, part pallet lists and part nesting drawings.

[0008] The part code identifies the position and subordinate relationship of each part in the forming, assembly and assembly stages through coding; the special flow code is an independently set code, which corresponds to the production process of the assembly in the secondary stage, and separately codes the parts belonging to the non-forming, small forming and large forming stages and different processing steps.

[0009] S3: According to the requirements of the engineering stage, the parts are cut into different channels and then arranged into different channels according to the special flow code and the parts pallet list assembled in the secondary stage.

[0010] S4: Complete the production of T-profiles within the secondary assembly range on the T-profile production line;

[0011] S5: Complete the assembly and construction of small forming components of each rib and partition at the small forming station;

[0012] Small molded parts are planar components assembled from two or more parts on a platform. The assembled parts have a small area and light weight.

[0013] S6: Complete the assembly and construction of each longitudinal girder and platform large-formed component at the large-formed work station;

[0014] Large-formed components are planar components assembled from two or more parts on a platform. The assembled components have a large area and heavy weight.

[0015] S7: Design a specialized hoisting method and assembly positioning reinforcement tooling, and assist automatic welding equipment to complete the assembly and construction of secondary intermediate assembly of rib plate + longitudinal girder, platform + partition plate, ramp plate + rib frame, bottom pier, and top pier on the secondary intermediate assembly tooling platform; the secondary intermediate assembly is composed of parts, small formed components, and large formed components on the secondary intermediate assembly tooling platform to form a simple secondary intermediate assembly component with small area, light weight, and simple structure;

[0016] S8: Complete the installation of outfitting components such as steps, zinc block bases, markers, and cable racks;

[0017] S9: Conduct internal and external integrity acceptance and transport the completed three-dimensional secondary assembly barge to the segment manufacturing station to assemble it with other components into a complete segment.

[0018] Preferably, the assembly range in step S1 includes a T-shaped or box-shaped three-dimensional assembly structure assembled from ribs, partitions, longitudinal girders and platforms.

[0019] Preferably, the secondary assembly drawings in step S2 include process drawings for reinforcement, tightness, mounting, and hoisting.

[0020] Preferably, the hoisting method in step S7 is to design structural lifting lug holes based on the center of gravity position of the secondary assembly, and to determine the shackle model based on the weight of the hoisted object and the distance between the structural lifting lug holes and the structural edge.

[0021] Preferably, the diameter of the structural lifting lug eye is determined by the diameter of the shackle pin, and the eye cover is designed according to the structure itself and the lifting strength.

[0022] Preferably, in step S7, the secondary assembly of the rib plate + longitudinal girder is formed by equidistantly arranging several partitions and assembling them perpendicularly to the side platform. The secondary assembly of the platform + partition plate is formed by equidistantly arranging several rib plates and assembling them perpendicularly to the side longitudinal girder. The two have similar structural forms, and structural lifting eye holes are opened on two partitions / ribs near the center of gravity. The structural lifting eye holes are set at a position slightly above the side center of gravity, so that the angle between the lifting state of the secondary assembly of the rib plate + longitudinal girder and the secondary assembly of the platform + partition plate and the horizontal plane is between 20 degrees and 45 degrees.

[0023] When the angle between the hoisted state and the horizontal plane is between 20 and 45 degrees, there will be no severe inertial impact due to gravity during hoisting. At the same time, the smaller the angle between the secondary assembly and the horizontal plane, the more conducive it is to accurately control the assembly and positioning of the secondary assembly on the segment.

[0024] Preferably, in step S7, the diaphragm of the secondary assembly of the bottom pier / secondary assembly of the top pier includes one diaphragm located in the middle or several equidistant diaphragms. The diaphragms are provided with structural lifting lugs. When there is only one diaphragm, there is only one structural lifting lug. When there are several diaphragms, the structural lifting lugs need to be opened at the same position on the two diaphragms near the center of gravity. The diaphragm is in the shape of a right trapezoid. The position of the structural lifting lug is set on the side near the long base, and the distance from the right angle side is less than or equal to 350mm. During assembly, the position where the secondary assembly of the bottom pier / secondary assembly of the top pier contacts the lifting rope is provided with angle steel / channel steel for protection.

[0025] Preferably, in step S7, the secondary assembly of the ramp plate + rib frame includes several rib frames, each vertically fixed to the ramp plate. The rib frames are right-angled trapezoids with rounded corners. The ramp plate has main lifting lugs, and the rib frames have ventilation and light-reducing holes at their sharp corners. The edges of the rib frames have several L-shaped holes. During the assembly of the secondary assembly of the ramp plate + rib frame, if the outer side plate has several flattened spherical steel bars of equal height, the rotation points and rotation... Adjust the angle and distance, move the pointed end of the secondary assembly of the ramp plate + rib frame to the rotation point and fix it. Slowly rotate the secondary assembly of the ramp plate + rib frame to the L-shaped hole and fit the flat spherical steel through the main lifting lug. If the outer plate of the side has several T-shaped profiles of different heights, the ventilation and lightening holes are used as structural lifting lug holes to cooperate with the main lifting lug to move and turn the secondary assembly of the ramp plate + rib frame. Align the L-shaped hole with the T-shaped profile from the side and slowly move it to the assembly point.

[0026] Compared with the prior art, the present invention has the following advantages: by establishing the scope of the secondary assembly and determining the composition of the secondary assembly, as well as by refining the management of the assembly process, the components in different secondary assemblies are completed before the jig is made, reducing the jig assembly time and the time for repeated acceptance; the design of a special secondary assembly hoisting method and assembly method reduces the time for additional welding of lifting lugs and damage to components, and the designed structural lifting lug eye holes are also suitable for the positioning of the segmented stage, and can be retained without encapsulation. Attached Figure Description

[0027] Figure 1 This is a flowchart of the secondary assembly process of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure assembled in the platform + partition secondary stage of the present invention.

[0029] Figure 3 This is a hoisting diagram of the platform + partition secondary assembly in this invention.

[0030] Figure 4 This is a schematic diagram of the structure assembled in the secondary pier of the present invention.

[0031] Figure 5 This is a schematic diagram of the hoisting and lifting of the secondary pier assembly in this invention.

[0032] Figure 6 This is a hoisting diagram of the secondary assembly of the ramp plate + rib frame in this invention. Wherein, 1-platform + partition plate secondary assembly, 11-longitudinal girder, 12-partition plate, 121-first structural lifting lug eye, 13-first lifting rope, 2-bottom pier secondary assembly, 21-pier side plate, 22-transverse partition plate, 221-second structural lifting lug eye, 222-first main lifting lug, 23-channel steel, 24-second lifting rope, 25-third lifting rope, 3-ram plate + rib frame secondary assembly, 31-rib frame, 311-L-shaped hole, 312-ventilation and weight reduction hole, 32-fourth lifting rope, 33-flat spherical steel, 34-second main lifting lug. Detailed Implementation

[0033] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading this invention, any modifications of the invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0034] like Figure 1 The method for assembling and fabricating the secondary hull structure shown includes the following steps:

[0035] S1: In the early stages of ship design, the assembly scope of the secondary assembly is determined and defined based on detailed assembly guidelines, existing basic resources, technological processes, and product structural characteristics.

[0036] The assembly scope of the secondary assembly is determined based on the site's steel platform, supporting cranes, canopies, welding equipment, power facilities, specialized assembly tools, detailed assembly, production and distribution, safety specifications for temporary reinforcement, safety specifications for hoisting, safety specifications for turning tools; as well as processes such as material cutting, beveling, welding, flattening, hoisting and assembly; and the structural characteristics of each component, including the double bottom assembly in the cargo hold area, the bottom side assembly in the cargo hold area, the bottom pier assembly of the trough-shaped bulkhead, the top side assembly in the cargo hold area, the middle assembly of the trough-shaped bulkhead, and the top pier assembly of the trough-shaped bulkhead.

[0037] S2: Design secondary assembly drawings for the assembly scope of secondary assembly, and design special part codes, special flow codes, part pallet lists and part nesting drawings.

[0038] For each part, a part code is set according to its position in the sheet body, intermediate assembly, its corresponding section, secondary intermediate assembly, large forming / three-dimensional large forming, small forming / three-dimensional small forming, its location on the ship and the corresponding drawings, as well as the arrangement and processing procedures of each part; a special flow code is set for the different flow directions of the hull parts before the secondary intermediate assembly stage, which is a set of short and easy-to-use flow codes for construction workers to judge the flow direction of the hull parts; all flow codes are automatically translated by the software according to the part code and filled into the "flow direction" column of the CNC nesting drawing and the profile cutting drawing.

[0039] S3: According to the requirements of the engineering stage, the parts are cut into different channels and then arranged into different channels according to the special flow code and the parts pallet list assembled in the secondary stage.

[0040] S4: Complete the production of T-profiles within the secondary assembly range on the T-profile production line;

[0041] S5: Complete the assembly and construction of small forming components of each rib and partition at the small forming station;

[0042] S6: Complete the assembly and construction of each longitudinal girder and platform large-formed component at the large-formed work station;

[0043] S7: Design a special hoisting method and assembly positioning reinforcement tooling, and assist automatic welding equipment to complete the assembly and construction of the secondary intermediate assembly tooling platform, including the secondary intermediate assembly of rib plate + longitudinal girder, platform + partition plate, slope plate + rib frame, bottom pier, and top pier.

[0044] S8: Complete the installation of outfitting components such as steps, zinc block bases, markers, and cable racks;

[0045] S9: Conduct internal and external integrity acceptance and transport the completed three-dimensional secondary assembly barge to the segment manufacturing station to assemble it with other components into a complete segment.

[0046] Furthermore, the assembly scope in step S1 includes a T-shaped or box-shaped three-dimensional assembly structure assembled from ribs, partitions, longitudinal girders, and platforms.

[0047] Furthermore, the secondary assembly drawings in step S2 include process drawings for reinforcement, tightness, mounting, and hoisting.

[0048] Furthermore, in step S7, the hoisting method involves designing structural lifting lug holes based on the center of gravity position of the secondary assembly, and determining the shackle model based on the weight of the hoisted object and the distance between the structural lifting lug holes and the structural edge.

[0049] Furthermore, the diameter of the structural lifting lug eyelet is determined by the diameter of the shackle pin, and the eyelet cover plate is designed according to the structure itself and the lifting strength.

[0050] Furthermore, in step S7, the secondary assembly of the rib plate + longitudinal girder is formed by equidistantly arranging several partitions and assembling them perpendicularly to the side platform. The secondary assembly of the platform + partition plate is formed by equidistantly arranging several rib plates and assembling them perpendicularly to the side longitudinal girder. The two have similar structural forms, and structural lifting eye holes are opened on two partitions / ribs near the center of gravity. The structural lifting eye holes are set at a position slightly above the side center of gravity, so that the angle between the lifting state of the secondary assembly of the rib plate + longitudinal girder and the secondary assembly of the platform + partition plate and the horizontal plane is between 20 degrees and 45 degrees.

[0051] by Figures 2 to 3 The platform + partition 12 secondary assembly 1 is illustrated as an example. The platform + partition 12 secondary assembly 1 shown is formed by five partitions 12 arranged at equal intervals and assembled perpendicularly to the longitudinal girder 11 on the side. The first structural lifting eye hole 121 is opened at the same position on the two partitions 12 near the center of gravity. The first structural lifting eye hole 121 is located slightly above the center of gravity. This position is found by software simulation. The first structural lifting eye hole 121 is pierced by the first lifting rope 13. The two first lifting ropes 13 suspend the platform + partition 12 secondary assembly 1, so that the bottom surface of the suspended platform + partition 12 secondary assembly 1 makes an angle of 20 degrees with the horizontal plane, which facilitates the alignment and installation during the assembly of the secondary assembly.

[0052] Furthermore, in step S7, the diaphragm of the secondary assembly of the bottom pier / secondary assembly of the top pier includes a central diaphragm or several equidistant diaphragms. The diaphragms are provided with structural lifting lugs. When there is only one diaphragm, there is only one structural lifting lug. When there are several diaphragms, the structural lifting lugs need to be opened at the same position on the two diaphragms near the center of gravity. The diaphragm is in the shape of a right trapezoid. The structural lifting lugs are located near the long base side and the distance from the right angle side is less than or equal to 350mm. During assembly, the position where the secondary assembly of the bottom pier / secondary assembly of the top pier contacts the lifting rope is protected by angle steel / channel steel, and no additional lifting lugs are required.

[0053] by Figures 4 to 5 Taking the secondary assembly 2 of the pier as an example, the secondary assembly 2 of the pier shown consists of four transverse diaphragms 22 and three pier side plates 21 that are attached to each other. The two transverse diaphragms 22 in the middle are provided with second structural lifting lug holes 221 at the same position. The second structural lifting lug holes 221 are passed through the second lifting rope 24. The transverse diaphragm 22 is a right trapezoid. The second structural lifting lug holes 221 are located near the long bottom edge and are 300mm away from the right angle. The first main lifting lug 222 is provided near the inclined side on the short bottom edge of the transverse diaphragm 22. The first main lifting lug 222 is passed through the second lifting rope 24. The second structural lifting lug holes 221 are passed through the third lifting rope 25. The third lifting rope 25 is protected by a transverse channel steel 23 welded vertically upward. The second lifting rope 24 and the third lifting rope 25 work together to move and turn the transverse diaphragm 22.

[0054] Furthermore, in step S7, the secondary assembly of the ramp plate + rib frame includes several rib frames, each vertically fixed to the ramp plate. The rib frames are right-angled trapezoids with rounded corners. The ramp plate has main lifting lugs, and the rib frames have ventilation and light-reducing holes at their sharp corners. The edges of the rib frames have several L-shaped holes. During the assembly of the secondary assembly of the ramp plate + rib frame, if the outer side plate has several flattened spherical steel pieces of equal height, the rotation points are pre-defined. By adjusting the rotation angle and distance, the pointed end of the secondary assembly of the ramp plate + rib frame is moved to the rotation point and fixed. The secondary assembly of the ramp plate + rib frame is slowly rotated through the main lifting lug until the L-shaped hole is fitted with the flat spherical steel. If the outer plate of the side is provided with several T-shaped profiles of different heights, the ventilation and lightening holes are used as structural lifting lug holes to cooperate with the main lifting lug to move and flip the secondary assembly of the ramp plate + rib frame. The L-shaped hole is aligned with the T-shaped profile from the side and slowly moved to the assembly point.

[0055] by Figure 6Taking the secondary assembly 3 of the ramp plate + rib frame as an example, the ramp plate + rib frame secondary assembly 3 shown has a rib frame 31 assembled inside. The rib frame 31 is vertically fixed to the ramp plate. The rib frame 31 is a right trapezoid with rounded corners. The ramp plate corresponding to the position of the inclined side of the rib frame 31 near the short base is welded with a second main lifting lug 34. A fourth lifting rope 32 passes through the second main lifting lug 34. The rib frame 31 has ventilation and weight-reducing holes 312 on its pointed corners. The rib frame 31 is ready for assembly. The assembly has five L-shaped holes 311 on one side. When assembling the rib frame 31 + ramp plate, if the outer side plate has five flat spherical steels 33 of equal height, the shape and size of the L-shaped holes 311 and the flat spherical steels 33 are matched in advance. By defining the rotation point, rotation angle and distance, the sharp corner of the ramp plate 31 + frame structure is moved to the rotation point and fixed. The rib frame 31 + ramp plate is slowly rotated by the second main lifting lug 34 until all the L-shaped holes 311 and the flat spherical steels 33 are fitted together.

[0056] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A method for assembling and fabricating a three-dimensional secondary hull, characterized in that, Includes the following steps: S1: In the early stage of ship design, the assembly scope of the secondary assembly is determined and defined based on the detailed assembly guidelines, existing basic resources, process flow and product structural characteristics; the assembly scope includes T-shaped or box-shaped three-dimensional assembly structures assembled from ribs, bulkheads, longitudinal girder and platform. S2: Design secondary assembly drawings for the assembly scope of secondary assembly, and design special part codes, special flow codes, part pallet lists and part routing drawings; the secondary assembly drawings include process drawings for reinforcement, tightness, racking and hoisting. S3: According to the requirements of the engineering stage, the parts are cut into different channels and then arranged into different channels according to the special flow code and the parts pallet list assembled in the secondary stage. S4: Complete the production of T-profiles within the secondary assembly range on the T-profile production line; S5: Complete the assembly and construction of small forming components of each rib and partition at the small forming station; S6: Complete the assembly and construction of each longitudinal girder and platform large-formed component at the large-formed work station; S7: Design a special hoisting method and assembly positioning reinforcement tooling, and assist automatic welding equipment to complete the assembly and construction of secondary secondary assembly consisting of rib plates and longitudinal girders, secondary secondary assembly consisting of platforms and partitions, secondary secondary assembly consisting of ramp plates and rib frames, secondary secondary assembly of bottom piers and secondary secondary assembly of top piers in the secondary assembly tooling platform. The hoisting method involves designing structural lifting lugs based on the center of gravity of the secondary assembly, and determining the shackle model based on the weight of the load and the distance between the structural lifting lugs and the edge of the structure. The diameter of the structural lifting lugs is determined by the diameter of the shackle pin, and the lug cover is designed according to the structure itself and the hoisting strength. The secondary assembly composed of ribs and longitudinal girders is formed by equidistantly arranged partitions and perpendicularly assembled with the side platform. The secondary assembly composed of platforms and partitions is formed by equidistantly arranged ribs and perpendicularly assembled with the side longitudinal girders. The two have similar structural forms, and both have structural lifting eye holes opened on two partitions / ribs near the center of gravity. The structural lifting eye holes are set at a position slightly above the side center of gravity, so that the angle between the lifting state of the secondary assembly composed of ribs and longitudinal girders and the secondary assembly composed of platforms and partitions and the horizontal plane is between 20 degrees and 45 degrees. The diaphragm of the secondary assembly of the bottom pier / secondary assembly of the top pier includes a middle diaphragm or several equidistant diaphragms. The diaphragm has structural lifting lugs. When there is only one diaphragm, there is only one structural lifting lug. When there are several diaphragms, the structural lifting lugs need to be opened at the same position on the two diaphragms near the center of gravity. The diaphragm is in the shape of a right trapezoid. The structural lifting lugs are located on the side near the long base and the distance from the right angle side is less than or equal to 350mm. During assembly, the position of the secondary assembly of the bottom pier / secondary assembly of the top pier in contact with the lifting rope is protected by angle steel / channel steel. The secondary assembly consisting of the ramp plate and the rib frame contains several rib frames. The ramp plate is vertically fixed to each rib frame, which is a right-angled trapezoid with rounded corners. The ramp plate has main lifting lugs, and the rib frames have ventilation and weight-reducing holes at their sharp corners. Several L-shaped holes are provided along the edges of the rib frames. When assembling the secondary assembly consisting of the ramp plate and the rib frames, if the outer side plating contains several flattened spherical steel bars of equal height, the rotation points, rotation angles, and distances should be predetermined. The sharp end of the secondary assembly consisting of the ramp plate and the rib frame is moved to the rotation point and fixed. The secondary assembly consisting of the ramp plate and the rib frame is slowly rotated through the main lifting lug until the L-shaped hole is fitted with the flat spherical steel. If the outer plate of the side is provided with several T-shaped profiles of different heights, the ventilation and lightening hole is used as a structural lifting lug eye hole to cooperate with the main lifting lug to move and turn the secondary assembly consisting of the ramp plate and the rib frame. The L-shaped hole is aligned with the T-shaped profile from the side and slowly moved to the assembly point. S8: Complete the installation of steps, zinc block bases, markers, and cable trays; S9: Conduct internal and external integrity acceptance and transport the completed three-dimensional secondary assembly barge to the segment manufacturing station to assemble it with other components into a complete segment.

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