Composite ship bilge outer plate appendage structure and ship block construction method

Abstract

The composite ship bilge outer plate appendage structure comprises bilge keel flat-bulb steel, a bilge keel outer plate web and appendage structure small assemblage bodies, and the appendage structure small assemblage bodies are arranged at the head, tail and middle strong structure positions of a large segmented assemblage correspondingly; the appendage structure small assemblage comprises a triangular appendage structure plate and a streamline appendage structure panel, one right-angle side of the triangular appendage structure plate is connected with the bilge keel flat-bulb steel in an attached mode, and the other right-angle side of the triangular appendage structure plate is connected with the outer plate in an attached mode. A streamline appendage structure panel is arranged at the bottom of the triangular appendage structure plate, one end of the streamline appendage structure panel is connected with the outer plate, and the other end of the streamline appendage structure panel is connected with bilge keel flat-bulb steel. An appendage structure toggle plate is further arranged on the appendage structure small assemblage in the bow direction of the outer plate. The triangular appendage structure is used for replacing temporary tools, the longitudinal and rib preassembling process is optimized, welding damage and construction risks are remarkably reduced, and the building efficiency and the structural strength are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly relates to a composite ship bilge outer plate attachment structure and a ship section construction method. Background Art

[0002] During the construction process of the ship bilge structure, it needs to go through stages such as sectional assembly, transportation, and overall assembly. The bilge structure in the middle area of the ship is composed of the outer hull plate and the external attachment structure bilge keel. When carrying out ship sectional construction, transportation after sectional completion, in - section overall assembly, and large - block assembly and erection in the dock or on the slipway, additional positioning, fixing, strengthening, and supporting work need to be carried out on the outer plate and the outer plate attachment structure. The existing technology has the following problems: (1) Repeated welding and damage: During sectional construction, it is necessary to repeatedly weld temporary tooling parts (such as support bases), resulting in damage to the outer plate paint and structure and destroying the integrity of the cabin; most of the existing bilge fixing methods still rely on temporary welding, and the outer plate needs to be repaired after removal.

[0003] (2) High construction risk: There are frequent high - altitude operations. According to the "Shipbuilding Safety Code" (2020), the proportion of high - altitude falling accidents in the bilge area reaches 15%.

[0004] (3) Low efficiency: Before the sectional turnover, it is necessary to install loose ribs, outer plate longitudinal ribs, and outer plates, which prolongs the construction period; it is pointed out in the literature "Research on Modular Construction Technology of Ship Design" that 30% of the time in traditional processes is used for rework to correct welding deformation.

[0005] (4) Insufficient structural strength: Temporary strengthening tooling parts need to be welded during the installation of the bilge keel and transportation after sectional completion. Stress concentration points are likely to be left after the removal of the temporary strengthening tooling parts. For example, the design of the through - welding hole will weaken the strength of the bilge keel.

[0006] Therefore, there is an urgent need for a composite ship bilge outer plate attachment structure and a ship section construction method to solve problems such as frequent use of temporary tooling parts, large welding deformation, and low construction efficiency in traditional processes. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above - mentioned deficiencies and provide a composite ship bilge outer plate attachment structure and a ship section construction method. By using a permanent structure to replace temporary tooling parts and optimizing the process flow, the problems of large welding damage, low construction efficiency, and insufficient structural strength in traditional processes are solved.

[0008] The purpose of the present invention is achieved as follows: A composite hull bilge outer plate attachment structure, including bilge keel bulb flat steel, bilge keel outer plate web, and attachment structure sub-assembly. The attachment structure sub-assemblies are respectively arranged at the head, tail, and middle strong structure positions of the sectional large assembly. The sectional large assembly includes bottom structure intermediate assembly, small transverse bulkhead intermediate assembly, bilge structure intermediate assembly, and external stiffening intermediate assembly. The external stiffening intermediate assembly includes outer plate ribs, outer plate, and outer plate longitudinal stiffeners. The inner wall of the outer plate is provided with criss-crossed outer plate ribs and outer plate longitudinal stiffeners to form the external stiffening intermediate assembly. The outer wall of the outer plate is provided with a bilge keel outer plate web. A full-length bilge keel bulb flat steel is provided on the bilge keel outer plate web. Attachment structure sub-assemblies are respectively and vertically arranged between the bilge keel bulb flat steel and the bilge keel outer plate web at the head, middle, and tail. The attachment structure sub-assembly includes a triangular attachment structure plate and a streamlined attachment structure panel. One right-angled side of the triangular attachment structure plate is attached and connected to the bilge keel bulb flat steel, and the other right-angled side is attached and connected to the outer plate. The bottom of the triangular attachment structure plate is provided with a streamlined attachment structure panel, which is perpendicularly connected to the triangular attachment structure plate. One end of the streamlined attachment structure panel is connected to the outer plate, and the other end is connected to the bilge keel bulb flat steel. An attachment structure bracket is further provided on the attachment structure sub-assembly in the bow direction of the outer plate. The attachment structure bracket is vertically arranged on the streamlined attachment structure panel. The attachment structure bracket is arranged on the center line of the triangular attachment structure plate, and the extension line of the attachment structure bracket intersects with the connection part of the ship's outer plate and the bilge keel bulb flat steel.

[0009] Further, the triangular attachment structure plate is an equilateral right-angled structure, which is consistent with the ship's cross-section. The bottom of the triangular attachment structure plate is horizontally consistent with the ship's baseline, and the top is perpendicular to the center line of the bilge keel bulb flat steel.

[0010] Further, the connection length of the triangular attachment structure plate and the bilge keel bulb flat steel is 3 / 5 of the sectional length of the bilge keel bulb flat steel.

[0011] Further, two symmetrically arranged elliptical holes are opened on the triangular attachment structure plate for weight reduction and flow-through.

[0012] Further, the plate thickness of the triangular attachment structure plate is 15 mm, and the plate thickness of the streamlined attachment structure panel is 20 mm.

[0013] Further, the bottom structure intermediate assembly, small transverse bulkhead intermediate assembly, and bilge structure intermediate assembly are arranged inside the outer plate. The bottom structure intermediate assembly and the bilge structure intermediate assembly are distributed left and right. One side of the small transverse bulkhead intermediate assembly is arranged on the bottom structure intermediate assembly, and the other side is clamped with the bilge structure intermediate assembly.

[0014] Furthermore, the sectional large block erection is transported by riding saddles for transportation. A support circular tube is arranged between the small block erection of the attached structure of the sectional large block erection and the riding saddles for transportation. The top end of the support circular tube supports on the bottom surface of the small block erection of the attached structure, and the bottom end of the support circular tube is fixedly welded on the riding saddles for transportation.

[0015] Furthermore, the sectional large block erection is closed up by composite steel - cement rest blocks. Multiple groups of parallel - arranged composite steel - cement rest blocks are provided below the sectional large block erection. Each group includes three composite steel - cement rest blocks. Two of the composite steel - cement rest blocks are arranged below the horizontal plane of the sectional large block erection, and the other composite steel - cement rest block is arranged below the small block erection of the attached structure of this section. They are connected and supported through a support circular tube. The top end of the support circular tube supports on the bottom surface of the small block erection of the attached structure, and the bottom end of the support circular tube is fixedly welded on the composite steel - cement rest block.

[0016] Furthermore, the composite steel - cement rest block includes a cement - concrete body and an outer frame. The outer frame is made of steel - structure material, and its top can be rigidly fixed by welding with the support tube. The cement - concrete body is arranged inside. On the top of the left and right sides of both side surfaces of the outer frame, one lifting eye ring is arranged respectively.

[0017] A ship - sectional construction method, based on the above - mentioned composite ship bilge outer - plate attached structure, includes the following steps: S1. Prefabrication and installation of the external stiffened intermediate block: The outer - plate longitudinal stiffeners and outer - plate ribs are pre - installed with the curved outer plate in advance to form three external stiffened intermediate blocks. For the butt joint of the curved outer plate, only the backing weld is carried out. The longitudinal stiffeners and ribs are assembled in this state. After the assembly is completed, the filling and capping of the overall structure and the butt joint of the curved outer - plate sheet are carried out. S2. Prefabrication of the small block erection of the attached structure: The triangular attached - structure plates, streamlined panels and attached - structure brackets are pre - fabricated into groups in advance. S3. Fabrication of the intermediate and small block erections: Fabricate the bottom - structure intermediate block, small transverse - bulkhead intermediate block and bilge - structure intermediate block respectively according to the drawings. S4. Inverted - mold construction of the sectional block: With the platform as the base surface, carry out inverted - mold construction. First, install the bilge - structure intermediate block in the first step, install the external - plate stiffened intermediate block in the second step, install the small transverse - bulkhead intermediate block in the third step, install the bottom - structure intermediate block in the fourth step, install the web of the attached bilge keel in the fifth step, install the small block erection of the attached structure in the sixth step, and finally install the attached bilge keel. If the overall turnover of the sectional large - block erection is required during construction, the jig is directly and firmly welded to the support circular tube, and the support circular tube directly supports on the bottom of the streamlined attached - structure panel of the small block erection of the attached structure. In the sixth step, install the sub-assembly of the appendage structure to form a composite appendage structure for the outer plate of the ship's bilge: Weld the web plate of the bilge keel outer plate on the outer wall of the outer plate, and fix the positioning position and installation angle of the bilge keel bulb flat steel after installing the cover plate of the bilge keel outer plate; install the sub-assembly of the appendage structure at the head, middle and tail strengthening structures of the web plate of the bilge keel outer plate respectively; Weld the triangular appendage structure sub-assembly between the bilge keel bulb flat steel and the outer plate. The welds at the joints of the triangular appendage structure plate with the outer plate and the bilge keel bulb flat steel are required to be filled and rounded; Weld the streamlined appendage structure panel at the bottom of the triangular appendage structure sub-assembly. The welds at the joints of the streamlined appendage structure panel with the outer plate and the bilge keel bulb flat steel are required to be filled and rounded; There is a vertically welded appendage structure bracket on the streamlined appendage structure panel of the outer plate in the bow direction of the ship. The appendage structure bracket is arranged on the center line of the triangular appendage structure plate, and the extension line of the appendage structure bracket intersects with the joints of the ship's outer plate and the bilge keel bulb flat steel; The sub-assembly of the appendage structure, the bilge keel bulb flat steel and the cover plate of the bilge keel outer plate are combined into a composite appendage structure for the outer plate of the ship's bilge; S5. Transportation and mating; S51. During sectional transportation, the support pipe and the riding block are connected through the bottom of the composite appendage structure for the outer plate of the ship's bilge; S52. During general assembly mating, the support pipe is welded to the composite steel and cement rest pier to avoid damage to the sectional outer plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a composite appendage structure for the outer plate of the ship's bilge and a ship sectional construction method. By replacing the temporary tooling parts with permanent triangular appendage structures, optimizing the pre-assembly process of longitudinal frames and ribs, and adopting the composite rest pier rigid connection technology, the welding damage and construction risks are significantly reduced, the construction efficiency and structural strength are improved, and it is applicable to the construction of the bilge of large ships. It has the following advantages: (1) Reduce the welding workload: The use of temporary tooling parts is reduced by 80%, and the welding damage rate of the outer plate is reduced by 90%; (2) Improve the construction efficiency: The construction period of the bilge section is shortened by 4 days, and the general assembly mating efficiency is increased by 40%; (3) Enhance the structural strength: The fatigue life of the bilge keel connection is increased by 25% due to the design without through-welding holes; (4) Optimize the safety: The amount of high-altitude work is reduced by 60%, and the construction accident risk is reduced to less than 5%. Brief description of the drawings

[0019] Figure 1 It is a schematic diagram of the composite appendage structure for the outer plate of the ship's bilge of the present invention.

[0020] Figure 2 This is a schematic diagram of the structural prefabrication of the attached structure sub-assembly of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the large assembly of ship sections of the present invention.

[0022] Figure 4 This is a schematic diagram of the structural prefabrication of the stiffened middle assembly of the outer plate of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the middle assembly of the bottom structure of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the middle assembly of the bilge structure of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the middle assembly of the small transverse bulkhead of the present invention.

[0026] Figure 8 This is a schematic diagram of the overall view of the large assembly section after turning over of the present invention.

[0027] Figure 9 This is a schematic diagram of the transportation of the large assembly section in the normal state on the riding blocks of the present invention.

[0028] Figure 10 This is a schematic diagram of the overall assembly and support system of the present invention.

[0029] Figure 11 This is a schematic diagram of the structure of the composite steel and cement supporting pier of the present invention.

[0030] Wherein: Bilge keel bulb flat steel 1, bilge keel outer plate web 2, triangular attached structure plate 3, streamlined attached structure panel 4, attached structure bracket 5, attached structure sub-assembly 6, bottom structure middle assembly 7, small transverse bulkhead middle assembly 8, bilge structure middle assembly 9, external stiffened middle assembly 10, outer plate rib 11, outer plate 12, outer plate longitudinal girder 13, transportation riding block 14, support round tube 15, composite steel and cement supporting pier 16, cement concrete body 16.1, outer frame 16.2, lifting eye ring 16.3. Specific embodiments

[0031] To better understand the technical solution of the present invention, the following will be described in detail with reference to relevant drawings. It should be understood that the following specific embodiments are not intended to limit the specific implementation modes of the technical solution of the present invention, and they are only implementation modes that can be adopted by the technical solution of the present invention. It should be noted first that the description of the positional relationship of each component herein, such as component A is located above component B, is based on the relative positions of each component in the drawings and is not intended to limit the actual positional relationship of each component. Example 1

[0032] Refer to Figures 1 - 2 , Figure 1 Draw a schematic structural diagram of the composite ship bilge outer plate attachment structure of the present invention. As shown in the figure, a composite ship bilge outer plate attachment structure of the present invention includes a bilge keel bulb flat bar 1, a bilge keel outer plate web 2, and an attachment structure sub-assembly 6. The attachment structure sub-assembly 6 is respectively arranged at the head, tail, and middle strong structure positions of the sectional large assembly.

[0033] The sectional large assembly includes a bottom structure intermediate assembly 7, a small transverse bulkhead intermediate assembly 8, a bilge structure intermediate assembly 9, and an external stiffening intermediate assembly 10. The external stiffening intermediate assembly 10 includes an outer plate rib 11, an outer plate 12, and an outer plate longitudinal girder 13.

[0034] On the outer wall of the outer plate 12, there is a bilge keel outer plate web 2 that fits the curve of the outer plate 12. Vertically above the center of the bilge keel outer plate web 2, there is a bilge keel bulb flat bar 1. An attachment structure sub-assembly 6 is arranged between the bilge keel bulb flat bar 1 and the bilge keel outer plate web 2.

[0035] The attachment structure sub-assembly 6 includes a triangular attachment structure plate 3 and a streamlined attachment structure panel 4. The triangular attachment structure plate 3 is an equilateral right-angled structure, which is consistent with the ship's cross-section. The bottom of the triangular attachment structure plate 3 is horizontally consistent with the ship's baseline, and the top is perpendicular to the center line of the bilge keel bulb flat bar 1 (bilge keel); One right-angled side of the triangular attachment structure plate 3 is attached to and connected with the bilge keel bulb flat bar 1, and the other right-angled side is attached to and connected with the outer plate 12. At the connection points of the triangular attachment structure plate 3 with the outer plate 12 and the bilge keel bulb flat bar 1, it is required that the welds be filled and rounded for transition; the connection length of the triangular attachment structure plate 3 with the bilge keel bulb flat bar 1 is about 3 / 5 of the sectional length of the bilge keel bulb flat bar 1; At the bottom of the triangular attachment structure plate 3, there is a streamlined attachment structure panel 4. The streamlined attachment structure panel 4 is perpendicularly connected to the triangular attachment structure plate 3. One end of the streamlined attachment structure panel 4 is connected to the outer plate 12, and the other end is connected to the bilge keel bulb flat bar 1. At the connection points of the streamlined attachment structure panel 4 with the outer plate 12 and the bilge keel bulb flat bar 1, it is required that the welds be filled and rounded for transition; There are two symmetrically arranged elliptical holes on the triangular attachment structure plate 3 for weight reduction and flow-through; On the sub-assembly 6 of the appendage structure in the bow direction of the outer plate 12, there is also an appendage structure bracket 5. The appendage structure bracket 5 is vertically arranged on the streamlined appendage structure panel 4. The appendage structure bracket 5 is arranged on the center line of the triangular appendage structure plate 3. The extension line of the appendage structure bracket 5 intersects with the connection part of the ship's outer plate 12 and the bilge keel bulb flat bar 1, that is, it passes through the right angle of the triangular appendage structure plate 3.

[0036] The thickness of the triangular appendage structure plate 3 is 15 mm, and the thickness of the streamlined appendage structure panel 4 is 20 mm, which reduces the navigation resistance.

[0037] On the inner wall of the outer plate 12, there are criss-crossed outer plate ribs 11 and outer plate longitudinal stiffeners 13, forming the external stiffened intermediate assembly 10.

[0038] Inside the outer plate 12, there are a bottom structure intermediate assembly 7, a small transverse bulkhead intermediate assembly 8 and a bilge structure intermediate assembly 9. The bottom structure intermediate assembly 7 and the bilge structure intermediate assembly 9 are distributed left and right. One side of the small transverse bulkhead intermediate assembly 8 is arranged on the bottom structure intermediate assembly 7, and the other side is clamped with the bilge structure intermediate assembly 9.

[0039] See Figure 9 , the sectional large assembly is transported by the transportation saddle 14. A support circular tube 15 is arranged between the appendage structure sub-assembly 6 of the sectional large assembly and the transportation saddle 14. The top end of the support circular tube 15 supports on the bottom surface of the appendage structure sub-assembly 6 (that is, the bottom surface of the streamlined appendage structure panel 4), and the bottom end of the support circular tube 15 is welded and fixed on the transportation saddle 14, canceling the original temporary support pier support small platform tooling parts.

[0040] See Figures 10 - 11 , when sectional intermediate closing and overall assembling and overall sectional large closing are required, it is necessary to install support piers. In this embodiment, a composite steel and cement support pier 16 is used. There are multiple groups of parallel composite steel and cement support piers 16 arranged below the sectional large assembly. Each group includes three composite steel and cement support piers 16. Two of the composite steel and cement support piers 16 are arranged below the horizontal plane of the sectional large assembly, and the other composite steel and cement support pier 16 is arranged below the appendage structure sub-assembly 6 of this section, and is connected and supported through the support circular tube 15; The top end of the support circular tube 15 supports on the bottom surface of the appendage structure sub-assembly 6 (that is, the bottom surface of the streamlined appendage structure panel 4), and the bottom end of the support circular tube 15 is welded and fixed on the composite steel and cement support pier 16.

[0041] The composite steel-cement supporting pier 16 includes a cement concrete body 16.1 and an outer frame 16.2. The cement concrete body 16.1 is arranged inside the outer frame 16.2. At the top of both side faces of the outer frame 16.2, a lifting eye ring 16.3 is arranged at each of the left and right sides; the outer frame 16.2 is an integrally welded steel structure, and its top is an integral steel plate, which is convenient for direct welding and fixing with the support circular tube.

[0042] The top of the composite steel-cement supporting pier 16 is made of steel structure material, which is matched with the support circular tube 15 and is fixed by welding to achieve rigid connection.

[0043] See Figures 3 - 11 , Figure 3 Draw a structural schematic diagram of the large block erection of the ship section of the present invention. As shown in the figure, a ship section construction method of the present invention, based on the above composite ship bilge outer plate attachment structure, includes the following contents: S1. Prefabrication and pre-installation of the external stiffened intermediate block; The longitudinal outer plate ribs and the outer plate ribs are pre-installed with the curved outer plate in advance to form the external stiffened intermediate block; The butt joint seam of the curved outer plate is only subjected to back welding (weld height 3 mm). Under this state, the longitudinal ribs and the ribs are assembled. After the assembly is completed, the filling and capping of the overall structure and the butt joint seam of the curved outer plate sheet are carried out; after the assembly is completed, the filling and capping are unified to reduce welding deformation; S2. Prefabrication of the prefabricated attachment structure sub-block; The triangular attachment structure plate, the streamlined panel and the attachment structure bracket are prefabricated and grouped in advance; S3. Fabrication of the intermediate and sub-blocks; Fabricate the bottom structure intermediate block, the small transverse wall intermediate block and the bilge structure intermediate block respectively according to the drawings; S4. Inverted building of the section; With the platform as the base surface, the inverted building is carried out. First, install the bilge structure intermediate block in the first step, install the external plate stiffened intermediate block in the second step, install the small transverse wall intermediate block in the third step, install the bottom structure intermediate block in the fourth step, install the attachment bilge keel web in the fifth step, install the prefabricated attachment structure sub-block in the sixth step, and finally install the attachment bilge keel; If the section large block erection needs to be welded after turning over, the jig is directly welded firmly with the support circular tube. The circular tube is directly supported at the bottom of the composite attachment structure, canceling the original habit of welding and fixing the support circular tube with the section outer plate and the jig; the support tube is directly placed on the bottom of the composite ship bilge outer plate attachment structure and is spot welded if necessary; In the sixth step, install the prefabricated attachment structure sub-block to form the composite ship bilge outer plate attachment structure: The bilge keel outer plate web is welded on the outer wall of the outer plate, and the bilge keel bulb flat steel is positioned and fixed at the installation angle after the bilge keel outer plate sheathing is installed; a full-length bilge keel bulb flat steel is vertically welded to the bilge keel outer plate web; Welded triangular appendage structure plates are respectively set at the fore, middle and stern reinforcement structures between the bilge keel bulb flat steel and the outer plate. The connection between the triangular appendage structure plate and the outer plate and the bilge keel bulb flat steel is required to be filled with rounded transition; There is a welded streamlined appendage structure panel on the bottom surface of the triangular appendage structure plate. The connection between the streamlined appendage structure panel and the outer plate and the bilge keel bulb flat steel requires the weld to fill in the rounded transition; The bracket of the appendage structure is vertically welded on the streamlined appendage structure panel of the outer plate toward the bow. The bracket of the appendage structure is arranged on the center line of the triangular appendage structure plate. The extension line of the bracket of the appendage structure intersects with the connection between the outer plate of the hull and the bulb flat steel of the bilge keel; The attachment structure group is combined with the bilge keel bulb flat steel and the bilge keel outer plate covering plate to form a composite ship bilge outer plate attachment structure. The combined group attachment structure union ensures rigid fixation during construction, assembly and welding to avoid deformation and displacement. S5, transportation and closure; S51. During segmented transportation, the support pipe and the riding pier are connected through the bottom of the composite ship bilge outer plate attachment structure; The linear side pier support pipe of the segment is directly placed on the bottom of the composite ship bilge outer plate appendage structure; the segment transport riding pier is directly welded to the supporting round pipe, and the round pipe is directly supported on the bottom of the composite ship bilge outer plate appendage structure, eliminating the original temporary pier support small platform tooling; S52. When the assembly is closed, the support pipe is welded to the composite steel cement pier (steel structure frame + concrete filling) to avoid damage to the segmented outer plate; The wired one-side pier support pipes of the two side segments that need to be closed are firmly welded to the top steel structure of the bottom composite steel-cement pier.

[0044] Specific implementation cases: Take the 8000TEU dual-fuel new energy powered container ship as an example: 1. Structural prefabrication: The triangular appendage structure (size 240mm×240mm) is prefabricated with the streamlined panel, and ribs are installed around the elliptical lightening holes; 2. Construction in sections: The outer plate longitudinal bones (bulb flat steel, specification 340×12mm) and ribs (bulb flat steel, specification 300×12mm) are pre-installed in the outer plate for assembly, and the outer plate butt joints are welded to the bottom and then the overall structure is assembled, and then the cover welding is carried out; 3. Overall combination: The bilge segment support pipe (Φ168mm steel pipe) and the composite pier (size 1500mm×600mm×1500mm) are rigidly fixed by welding, and the segment loading deviation is controlled within ±3mm.

[0045] Effect verification: The welding deformation is reduced from 8mm in traditional process to 2mm (laser measurement data).

[0046] Sailing resistance tests showed that the streamlined panel design reduced fuel consumption.

[0047] Working principle: The present invention provides a composite ship bilge outer plate appendage structure and a ship segment construction method, which has the following technical contents: 1. A permanent vertical triangular structure is set between the hull outer plate and the bilge keel of the external appendage structure to form a new type of composite ship bilge outer plate appendage structure. The structure is set at the head, tail and middle strong structure positions of the segment; the structure requires the bottom to be level with the hull baseline; the upper part of the structure is perpendicular to the center line of the hull outer plate appendage structure; the connection between the structure and the original appendage structure bilge keel requires about 3 / 5 of the bilge keel section length of the appendage structure; the connection between the structure and the outer plate and the appendage structure bilge keel requires a rounded transition; an elliptical lightening hole is opened in the middle of the structure, a streamlined panel is installed at the bottom of the structure, and a triangular bracket is set to strengthen the popular panel and the appendage structure plate; welding holes are not allowed to be opened at the connection between the end of the structure and the outer plate and the appendage bilge keel.

[0048] 2. When the outer plate bilge keel is installed, this structure serves as a permanent structure for installation positioning and angle fixing, controlling the installation angle of the bilge keel during the segmented construction stage, and controlling the displacement and deformation during welding construction and the entire construction process.

[0049] The bilge section changes the original practice of installing the outer plate longitudinals in bulk, installing the outer plate, turning over the sections, installing the ribs, and welding the outer plate longitudinals and ribs after turning over the sections. The outer plate longitudinals and ribs are moved forward, and the outer plate is pre-assembled into modular outer plates in advance, and then grouped in sections. When assembling in the construction of the curved sheet body, only the bottom welding is performed on the joints of the curved outer plate, and the ribs and longitudinals are assembled in this state. After the assembly is completed, the joints of the overall structure and the curved outer plate are filled and covered.

[0050] During the large assembly and construction stage of the bilge segment, this structure serves as the segment normal rear fixed structure and is connected and fixed to the anchor position, which facilitates the segment completion construction and replaces the original direct welding and fixation with the segment outer plate.

[0051] After the bilge sections are completed and unloaded, they are mounted on the saddle and transported in sections using a flatbed truck. This structure serves as a permanent fixture connected to the saddle, eliminating the temporary tooling support base originally installed on the section outer plate.

[0052] When the bilge sub - section is assembled and joined together, this structure is used to support on the composite cement - steel cover pier on the ground. The pier on the ground is a composite of steel structure and cement concrete, which is convenient for setting support pipes at the linear position of the bilge sub - section and rigidly connecting the pier. The support pipe is welded and fixed to the composite steel - cement pier, and supports the composite external attachment structure of the section, avoiding the welding between the support pipe and the section.

[0053] When the bilge sub - section is hoisted and joined together in the dock or on the shipbuilding berth, this structure serves as a permanent fixing device connecting to the dock pier, canceling the original temporary support base installed on the outer plate of the sub - section.

[0054] The present invention provides a composite ship bilge outer - plate attachment structure and a ship - section construction method, having the following creative key points: (1) The process of the outer - plate longitudinal stiffeners and ribs is advanced, and they are pre - installed with the outer plate into a modular outer - plate curved - surface sheet intermediate assembly in advance, breaking the original convention of installing the outer - plate longitudinal stiffeners in bulk first, then installing the outer plate, turning the section over to install the ribs, and then welding the outer - plate longitudinal stiffeners and ribs after turning the section over again. When assembling the curved - surface sheet intermediate assembly, only the root pass welding is carried out for the butt joint of the curved - surface outer - plate sheet. At this state, the ribs and longitudinal stiffeners are assembled. After the assembly is completed, the filling and capping of the overall structure and the butt joint of the curved - surface outer - plate sheet are carried out. It can not only advance the process and pre - install into modular groups, but also control the welding deformation, improving the overall precision level of the intermediate assembly and the section; at the same time, it realizes the flat - ground operation of a large number of high - altitude operations for installing outer - plate longitudinal stiffeners.

[0055] (2) The design of the composite attachment structure reduces the through - flow elliptical holes and streamline in the advancing direction, which is convenient for reducing the navigation resistance, avoiding local eddy currents, and reducing fuel consumption.

[0056] (3) The cancellation of the end welding holes of the composite attachment structure effectively strengthens the strength of the composite outer - plate attachment bilge keel structure; the composite attachment structure cancels the original temporary angle - positioning installation device and the fixed temporary tooling structure for installing the bilge keel of the bilge - section outer - plate attachment. The composite attachment structure has its own angle and permanent fixing function.

[0057] (4) The composite attachment structure cancels the original temporary welding and fixing between the outer plate and the anchoring position during the construction of the bilge section, and instead directly fixes it to this structure, avoiding damage to the important structure of the outer plate.

[0058] (5) The composite attachment structure cancels the support base of the outer - plate welding temporary tooling during the transportation, intermediate assembly and joining together of the bilge section, and the large - scale joining and hoisting of the bilge sub - section. Instead, at different height positions in the bilge - line area, the support pipe, the riding block and the composite steel - cement pier are welded and then directly fixed to the composite attachment structure, reducing the temporary tooling structure and avoiding the damage caused by the welding and removal of the important structure of the outer plate.

[0059] (6) The composite steel-cement supporting pier is a combination of steel structure and cement concrete. The application of this new type of supporting pier facilitates the rigid connection of the support pipe and the supporting pier at the linear position of the bilge partial section and the overall section. The support pipe is welded and fixed to the composite steel-cement supporting pier and supports the composite external attachment structure of the partial section and the overall section, avoiding the welding and fixing of the support pipe to the partial section and the overall section.

[0060] (7) It avoids a large amount of repeated installation, welding and demolition work, greatly reduces the high-altitude operation, reduces the utilization rate of large gantry crane hoisting, reduces the construction risk; avoids damage to the important structure of the outer plate; avoids damage to the paint; ensures the integrity of the cabin; reduces the consumption of various resources and effectively improves the production efficiency.

[0061] The above are only specific application examples of the present invention and do not constitute any limitation to the protection scope of the present invention. Any technical solutions formed by equivalent transformation or equivalent substitution fall within the scope of the rights protection of the present invention.

Claims

1. A composite ship bilge outer plate attachment structure, characterized in that: It includes bilge keel bulb flat bar (1), bilge keel outer plate web (2) and appendage structure sub-assembly (6), and the appendage structure sub-assembly (6) is respectively arranged at the head, tail and middle strong structure positions of the sectional large assembly; the sectional large assembly includes bottom structure intermediate assembly (7), small transverse bulkhead intermediate assembly (8), bilge structure intermediate assembly (9) and external stiffening intermediate assembly (10), the external stiffening intermediate assembly (10) includes outer plate ribs (11), outer plate (12) and outer plate longitudinal girders (13), and the inner wall of the outer plate (12) is provided with crisscross outer plate ribs (11) and outer plate longitudinal girders (13) to form the external stiffening intermediate assembly (10); The outer wall of the outer plate (12) is provided with the bilge keel outer plate web (2), and a continuous bilge keel bulb flat bar (1) is arranged on the bilge keel outer plate web (2), and appendage structure sub-assemblies (6) are respectively arranged at the head, middle and tail strong structure positions between the bilge keel bulb flat bar (1) and the bilge keel outer plate web (2); The appendage structure sub-assembly (6) includes a triangular appendage structure plate (3) and a streamlined appendage structure panel (4), one right-angled side of the triangular appendage structure plate (3) is attached and connected to the bilge keel bulb flat bar (1), and the other right-angled side is attached and connected to the outer plate (12); a streamlined appendage structure panel (4) is arranged at the bottom of the triangular appendage structure plate (3), the streamlined appendage structure panel (4) is vertically connected to the triangular appendage structure plate (3), one end of the streamlined appendage structure panel (4) is connected to the outer plate (12), and the other end is connected to the bilge keel bulb flat bar (1); An appendage structure bracket (5) is further arranged on the appendage structure sub-assembly (6) in the bow direction of the outer plate (12), the appendage structure bracket (5) is vertically arranged on the streamlined appendage structure panel (4), the appendage structure bracket (5) is arranged on the center line of the triangular appendage structure plate (3), and the extension line of the appendage structure bracket (5) intersects the connection position of the hull outer plate (12) and the bilge keel bulb flat bar (1).

2. A composite ship bilge outer plate appendage structure according to claim 1, characterized in that: The triangular appendage structure plate (3) is an equilateral right-angled structure, which is consistent with the hull cross-section, the bottom of the triangular appendage structure plate (3) is horizontally consistent with the hull baseline, and the top is perpendicular to the center line of the bilge keel bulb flat bar (1).

3. The composite ship bilge outer plate appendage structure according to claim 1, characterized in that: The connection length between the triangular appendage structure plate (3) and the bilge keel bulb flat bar (1) is 3 / 5 of the sectional length of the bilge keel bulb flat bar (1).

4. A composite ship bilge outer plate attachment structure according to claim 1, characterized in that: Two symmetrically arranged elliptical holes are opened on the triangular appendage structure plate (3) for weight reduction and flow-through.

5. A composite hull outer plate attachment structure for a ship's bilge according to claim 1, characterized in that: The plate thickness of the triangular appendage structure plate (3) is 15 mm, and the plate thickness of the streamlined appendage structure panel (4) is 20 mm.

6. The composite hull outer plate attachment structure for the bilge of a ship according to claim 1, characterized in that: The bottom structure intermediate assembly (7), small transverse bulkhead intermediate assembly (8) and bilge structure intermediate assembly (9) are arranged inside the outer plate (12), the bottom structure intermediate assembly (7) and the bilge structure intermediate assembly (9) are distributed left and right, one side of the small transverse bulkhead intermediate assembly (8) is arranged on the bottom structure intermediate assembly (7), and the other side is connected to the bilge structure intermediate assembly (9).

7. A composite ship bilge outer plate attachment structure according to claim 1, characterized in that: The sectional large block erection is transported by the shipping saddles (14). A support circular pipe (15) is arranged between the attachment structure sub-erection (6) of the sectional large block erection and the shipping saddles (14). The top end of the support circular pipe (15) supports on the bottom surface of the attachment structure sub-erection (6), and the bottom end of the support circular pipe (15) is welded and fixed on the shipping saddles (14).

8. A composite ship bilge outer plate appendage structure according to claim 1, characterized in that: The sectional large block erection is closed by the composite steel and cement supporting piers (16). A plurality of groups of parallel composite steel and cement supporting piers (16) are arranged below the sectional large block erection. Each group includes three composite steel and cement supporting piers (16). Two of the composite steel and cement supporting piers (16) are arranged below the horizontal plane of the sectional large block erection, and the other composite steel and cement supporting pier (16) is arranged below the attachment structure sub-erection (6) of this section and is connected and supported through the support circular pipe (15); the top end of the support circular pipe (15) supports on the bottom surface of the attachment structure sub-erection (6), and the bottom end of the support circular pipe (15) is welded and fixed on the composite steel and cement supporting pier (16).

9. A composite hull outer plate attachment structure for a ship's bilge according to claim 8, characterized in that: The composite steel and cement supporting pier (16) includes a cement concrete body (16.1) and an outer frame (16.2). The cement concrete body (16.1) is arranged inside the outer frame (16.2), and a lifting eye ring (16.3) is arranged at the top left and right of each side surface of the outer frame (16.2).

10. A method for constructing a ship section, based on a composite ship bilge outer plate attachment structure according to claim 1, characterized in that, It includes the following contents: S1. Prefabrication of the external stiffened intermediate erection; The outer plate longitudinal stiffeners and outer plate ribs are pre-assembled with the curved outer plate in advance to form the external stiffened intermediate erection; Only the backing weld is carried out for the butt joint of the curved outer plate. The longitudinal stiffeners and ribs are assembled in this state, and after the assembly is completed, the filling and capping of the overall structure and the butt joint of the curved outer plate sheets are carried out; S2. Prefabrication of the attachment structure sub-erection; The triangular attachment structure plates, streamlined panels and attachment structure brackets are prefabricated into a group in advance; S3. Fabrication of the intermediate and small erections; The bottom structure intermediate erection, small transverse bulkhead intermediate erection and bilge structure intermediate erection are fabricated respectively according to the drawings; S4. Inverted hull building of the section; Taking the platform as the base surface for inverted hull building, first install the bilge structure intermediate erection in the first step, install the external plate stiffened intermediate erection in the second step, install the small transverse bulkhead intermediate erection in the third step, install the bottom structure intermediate erection in the fourth step, install the attachment bilge keel web in the fifth step, install the attachment structure sub-erection in the sixth step, and finally install the attachment bilge keel; If the sectional large block erection needs to be turned over during construction, the jig is directly welded firmly with the support circular pipe, and the support circular pipe directly supports at the bottom of the streamlined attachment structure panel of the attachment structure sub-erection; In the sixth step, install the attachment structure sub-erection to form the composite ship bilge outer plate attachment structure: Weld the bilge keel outer plate web on the outer wall of the outer plate. After the installation of the bilge keel outer plate cover plate, the positioning position and installation angle of the bilge keel bulb flat bar are fixed; a full-length bilge keel bulb flat bar is vertically welded to the bilge keel outer plate web; Weld triangular attachment structure plates at the head, middle and tail strong structures between the bilge keel bulb flat bar and the outer plate respectively. The welds at the joints of the triangular attachment structure plates with the outer plate and the bilge keel bulb flat bar are required to be filled and rounded for transition; Weld the streamlined attachment structure panel to the bottom surface of the triangular attachment structure plate. At the joints of the streamlined attachment structure panel with the outer plate and the bulb flat bar of the bilge keel, it is required that the welds be filled and rounded for transition. Vertically weld the attachment structure bracket to the streamlined attachment structure panel on the outer plate in the bow direction. The attachment structure bracket is set on the center line of the triangular attachment structure plate, and the extension line of the attachment structure bracket intersects with the joints of the ship's outer plate and the bulb flat bar of the bilge keel. The attachment structure sub-assembly, the bulb flat bar of the bilge keel, and the covering plate of the bilge keel outer plate are combined into a composite ship bilge outer plate attachment structure. S5. Transportation and erection; S51. During sectional transportation, the support pipe and the riding block are connected through the bottom of the composite ship bilge outer plate attachment structure. S52. During overall erection, the support pipe is welded to the composite steel and cement supporting pier to avoid damage to the sectional outer plate.

Images