A method for constructing segmented positive molds for large-line steps on ships

Abstract

This invention relates to a method for segmented construction of a large-scale ship step, comprising the following steps: dividing the overall step into multiple preliminary sections along its height, using the deck or platform as the interface; dividing the preliminary sections into several sub-assembly components according to their specific structural forms; assembling each sub-assembly component in a sub-assembly workshop; completing the assembly of the preliminary sections on a platform using reverse-mounted construction; positioning the bottom preliminary sections on a transfer platform using forward-mounted construction; installing the upper preliminary sections on a transfer platform using forward-mounted construction; and transporting them to the welding site. This invention reduces the need for fixed jigs of varying heights, significantly reduces safety hazards, and improves the ship's production efficiency.

Description

Technical Field

[0001] This invention relates to the field of ship section construction technology, and in particular to a method for constructing a section of a ship with a large linear step. Background Technology

[0002] With the continuous progress of the times, my country's shipbuilding industry has developed efficiently. Under normal circumstances, when constructing a ship hull, the method of segmented construction is often chosen. This construction method can significantly shorten the shipbuilding cycle and improve the production efficiency of the hull.

[0003] In existing technologies, the construction of large-line stepped sections for ships is generally carried out in the following two ways:

[0004] (1) Construction is carried out on a fixed planar jig with the deck (or platform) as the base surface. After the planks are laid, longitudinal ribs are installed, followed by the installation of various intermediate group assembly components; after the jig is removed, transport racks are placed on the side jig with the outer plate as the base surface; finally, flatbed trucks are used to transport the jigs to the painting booth for painting until the section is completed. This construction method has the problems of long time occupied by the fixed jig, many high-altitude operation areas in the section construction, and unstable center of gravity of the transport racks on the outer plate as the base surface. The production and construction cycle of this method is long, the jig utilization rate is low, and there are significant safety hazards.

[0005] (2) Side-mounted jigs are constructed on a fixed curved jig, with the outer plate as the base. First, a fixed curved jig is made according to the outer plate's shape. After the outer plate is laid, longitudinal ribs are installed, followed by the installation of various intermediate group assembly components. After the jig is removed, the transport rack is placed on the jig in reverse, using the deck (or platform plate) as the base. Finally, flatbed trucks are used to transport the jigs to the painting room for sandblasting and painting until the section is completed. This construction method has the problems of requiring additional fabrication of the fixed curved jig, the difficulty of constructing sections on the jig in a non-forward manner, and the high risk of tipping over when transporting sections on the transport rack in reverse. This method has a long production and construction cycle, is difficult to construct, and poses significant safety hazards. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a segmented construction method for large-line steps of ships, so as to solve the problems of fixed construction sites, excessive time spent on the construction frame, long construction cycle, low construction efficiency, high construction difficulty, and high safety hazards in existing segmented construction of large-line steps.

[0007] The objective of this invention is achieved as follows:

[0008] A method for constructing a segmented keel for a ship's large-line step, comprising the following:

[0009] S1. Divide the preceding segments;

[0010] Based on the ship section type and specific structural form, the overall step section is divided into multiple preliminary sections in the height direction with the deck or platform as the interface, and one preliminary section is divided according to one step structure.

[0011] S2. Divide into small groups;

[0012] The aforementioned preliminary segments are further divided into several small assembly components according to their specific structural forms: rib plate small assembly components, longitudinal wall plate small assembly components, and platform plate small assembly components, among which the outer plate and outer plate longitudinal ribs are preliminary segment loose parts.

[0013] S3, small group assembly;

[0014] The assembly and construction of each sub-assembly component is completed in the sub-assembly workshop;

[0015] S4. The first sections are constructed and assembled on the platform using reverse tires;

[0016] In the segment workshop, each segment is constructed using a deck or platform as the base surface, and the assembly of each segment is completed before simple fillet welding is performed.

[0017] S5. The bottom-level pre-segment is positioned and installed on the transfer platform.

[0018] After the bottommost pre-section is flipped over, the correct tire is installed and positioned on the transfer platform at the exit of the section workshop;

[0019] S6. The upper-level pre-segment is installed on the transfer platform;

[0020] After flipping over the upper-level pre-assembly section, it is installed on the lower-level pre-assembly section on the transfer platform at the exit of the section workshop, completing the tire installation and assembly work of the entire section in the large assembly stage.

[0021] S7. Transport to the field for welding;

[0022] The transfer platform, along with the sections, is transported to the outdoor area of ​​the section workshop using transport vehicles for final fillet welding, completing all construction work before section painting.

[0023] Furthermore, in step S1, when dividing the structure into multiple preliminary sections in the height direction using the deck or platform as the interface, the outer plate of the lower section near the side of the hull must extend more than 200 mm beyond the platform plate. The structure of the upper section is divided by partitioning with the platform plate as the interface, which facilitates the upward hoisting and positioning of the upper single-layer large linear step preliminary section from top to bottom and its installation on the lower step preliminary section.

[0024] Furthermore, in step S1, the height of the initial segment does not exceed the height of one container bay.

[0025] Furthermore, in step S3, the installation and welding of parts such as decks or platforms, various ribs, various longitudinal wall panels and aggregates are carried out on a fixed jig inside the workshop, using a small plate frame as the base surface.

[0026] Furthermore, in step S4, the preliminary segmented construction of a stepped structure is carried out on a fixed jig inside the segmented workshop, using the deck or platform sub-assembly components as the base surface for reverse jig construction. Various rib plates and longitudinal wall panels sub-assembly components and some segmented loose parts are installed. Finally, the outer plate longitudinal ribs, outer plates and fillet welds are installed.

[0027] Furthermore, in step S4, multiple preliminary segments can be constructed simultaneously on fixed jigs inside the segmentation workshop, ensuring that several stepped preliminary segments can be completed at the same time, effectively shortening the overall segmentation construction time.

[0028] Furthermore, in step S5, after the bottommost pre-section is completed with fillet welding, it is flipped and placed on the transfer platform at the exit of the section workshop. Then, after the fillet welding of the upper pre-section is completed, the flipped and placed on the bottom pre-section of the transfer platform. The multi-layer stepped structure installs each layer of pre-sections from bottom to top.

[0029] Furthermore, in step S5, if the vertical position of the segment's center of gravity exceeds the lower step structure of the segment, then temporary supports are added at the edge of the uppermost step structure segment to increase the overall stability of the segment.

[0030] Furthermore, in step S6, the assembly of the entire segmented positive tire is completed at the workshop exit using a transfer platform, and the final welding of the segments is carried out in the outdoor area of ​​the workshop.

[0031] Furthermore, the transfer platform includes a platform panel, which is set on a grid-like planar bracket composed of multiple platform crossbeams and platform longitudinal girders. Two rows of platform columns are set below the platform panel to support the entire transfer platform.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This invention divides the complex large-scale integral segment into two or more simple small stepped structures for separate construction of the preliminary segments. Each preliminary segment only has one small group erection and assembly stage, which effectively simplifies the complex segmentation, reduces the need for high-altitude operations to be carried out at low altitudes and on flat ground, reduces the use of fixed jigs of varying heights, greatly reduces safety hazards, and improves the production efficiency of the hull.

[0034] This invention utilizes the opportunity of hoisting the segments out of the workshop to simultaneously complete the flipping of the preliminary steps and the assembly of the overall segments, effectively reducing the number of overhead crane trips, making full use of the workshop exit area, and replacing the overhead welding work that is difficult to carry out in the preliminary steps with flat fillet welding that is simple to deform after the segments are flipped.

[0035] This invention effectively solves the problems of large linear steps requiring fixed construction sites, excessive time spent occupying specific formwork, cumbersome and long construction process, low construction efficiency, high construction difficulty, and significant safety hazards. Attached Figure Description

[0036] Figure 1 This is a schematic diagram illustrating the overall segmentation of the present invention.

[0037] Figure 2 This is a schematic diagram of the structure of the subgroups of the present invention.

[0038] Figure 3 This is a schematic diagram of the assembly of the small group of components according to the present invention.

[0039] Figure 4 This is a schematic diagram of the underlying segmentation structure of the present invention, which is used for tire mounting and positioning on the transfer platform.

[0040] Figure 5 This is a schematic diagram of the structure of the upper-layer pre-segment being installed on the transfer platform.

[0041] Figure 6 This is a schematic diagram of the transfer platform of the present invention.

[0042] Figure 7 This is a schematic diagram of the method flow of the present invention.

[0043] in:

[0044] The overall staircase is divided into the following sections: 1. Upper section first; 2. Bottom section first; 3. Rib plate group assembly components; 4. Longitudinal wall panel group assembly components; 5. Platform panel group assembly components; 6. Outer panel; 7. Transfer platform; 8. Platform panel; 81. Platform crossbeam; 82. Platform longitudinal girder; 83. Platform column; 84. Implementation

[0045] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with relevant illustrations. It should be understood that the specific embodiments described below are not intended to limit the specific implementation of the technical solution of the present invention, but are merely possible implementations of the technical solution of the present invention. It should be noted that the descriptions of the positional relationships of the components herein, such as component A being located above component B, are based on the relative positions of the components in the illustrations and are not intended to limit the actual positional relationships of the components. Example 1

[0046] See Figure 1-7 , Figure 7 A schematic flowchart of the method of the present invention has been drawn. As shown in the figure, a method for constructing a segmented positive mold for a large-line step of a ship according to the present invention includes the following:

[0047] S1. Divide the data into bottom-level pre-defined segments and top-level pre-defined segments;

[0048] See Figure 1 Based on the ship section type and specific structural form, the overall step section 1 is divided into two layers in the height direction, with the deck or platform as the interface, forming two preliminary sections: the upper preliminary section 2 and the lower preliminary section 3.

[0049] S2. Divide into small groups;

[0050] See Figure 2 The upper pre-segment 2 and the lower pre-segment 3 are divided into several small assembly components according to their specific structural forms: rib plate assembly component 4, longitudinal wall plate assembly component 5 and platform plate assembly component 6, of which the outer plate 7 and the outer plate longitudinal rib are pre-segment loose parts.

[0051] S3, small group assembly;

[0052] See Figure 3 In the small assembly workshop, the assembly and construction of each small assembly component is completed. Using small plate frames as the base, the parts installation and welding work of decks or platforms, various ribs, various longitudinal wall plates and skeletons are carried out on the fixed jigs inside the workshop.

[0053] S4. The two preliminary sections were assembled on the platform after being constructed using reverse tires.

[0054] See Figure 2 In the segment workshop, the two sections are constructed using the deck or platform as the base surface, and the assembly of the two preliminary sections is completed. Then, simple fillet welding is completed.

[0055] S5, the bottom segment 3 is positioned on the transfer platform 8 for tire installation;

[0056] See Figure 4 After the bottom layer is first divided into sections 3, it is turned over and then the positive tire is installed and positioned on the transfer platform 8 at the exit of the section workshop.

[0057] S6. The upper section 2 is installed on the transfer platform 8 with a positive tire;

[0058] See Figure 5 After flipping over the upper preliminary section 2, it is installed on the lower preliminary section 3 on the transfer platform 8 at the exit of the section workshop, completing the tire installation and assembly work of the entire section in the large assembly stage.

[0059] S7. Transport to the field for welding;

[0060] The transfer platform 8, along with its sections, was transported to the outdoor area of ​​the section workshop using a transport vehicle for final fillet welding, completing all construction work before section painting.

[0061] See Figure 6 The transfer platform 8 includes a platform panel 81, which is set on a grid-like planar bracket composed of multiple platform crossbeams 82 and platform longitudinal girders 83, facilitating segmented construction on it; two rows of platform columns 84 are set below the platform panel 81 to support the entire transfer platform 8, facilitating lifting and transportation by flatbed transport vehicles, and can be placed on any vacant site in the company; temporary scaffolding, protective railings and access ladders are erected around the transfer platform during construction, and are removed after the segmented painting is completed.

[0062] In step S1, in the overall step segment 1, one step structure is divided into one preliminary segment. Typically, two step structures form two preliminary segments. If there are many steps in the segment structure, it can also be divided into three or more layers of step structures in the height direction with the deck or platform as the interface, forming three or more preliminary segments.

[0063] When dividing the structure into several layers in the height direction using the deck or platform as the interface, the outer plate of the lower layer section near the side of the ship must extend more than 200 mm beyond the platform plate. The structure of the upper layer section is divided by the platform plate as the interface, which facilitates the upward hoisting and positioning of the upper single-layer large linear step section and its installation on the lower step section.

[0064] The height of each initial section should not exceed the height of one container, which facilitates construction, reduces scaffolding, and avoids the dangers of working at height.

[0065] In step S4, the construction of each preliminary section is carried out on a fixed jig inside the section workshop, with the deck or platform group assembly components as the base surface for reverse jig construction. Various rib plates and longitudinal wall panels group assembly components and some section loose parts are installed. Finally, the outer plate longitudinal ribs and outer plates are installed, and some simple flat fillet welding work is completed. The difficult overhead welding work can be omitted.

[0066] A step segment can be divided into two or more step structures in advance, which can be constructed simultaneously on fixed jigs inside the segment workshop, ensuring that the advance segments of several step structures can be completed at the same time, effectively shortening the construction time of the overall segment.

[0067] In step S5, to reduce the time spent on fixing the jig inside the section workshop, after simple fillet welding is completed on a bottom stepped structure section, the jig is flipped and placed on the transfer platform at the exit of the section workshop. Then, after simple fillet welding is completed on the upper stepped structure section, the jig is flipped and placed on the bottom stepped section of the transfer platform. If there are multiple stepped structures, each stepped structure section is installed sequentially from bottom to top. If the vertical position of the section's center of gravity exceeds that of the bottom stepped structure section, temporary supports are added at the edge of the top stepped structure section to increase the overall stability of the section.

[0068] In step S6, the assembly of the overall stepped sections is completed at the workshop exit using a transfer platform. The final welding of the sections is carried out in the workshop's outer field. The overhead welding, which was difficult to construct in the previous sections, is transformed into ordinary flat fillet welding after being turned over. This effectively reduces the construction difficulty and greatly reduces the usage requirements of the fixed frame construction site inside the workshop.

[0069] The above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of the present invention.

Claims

1. A method for constructing segmented scaffolding for large-line steps on ships, characterized in that, Includes the following: S1. Divide the preceding segments; Based on the ship section type and specific structural form, the overall step section is divided into one or more preliminary sections in the height direction, with the deck or platform as the interface. Each preliminary section is divided according to a step structure. S2. Divide into small groups; The aforementioned preliminary segments are further divided into several small assembly components according to their specific structural forms: rib plate small assembly components, longitudinal wall plate small assembly components, and platform plate small assembly components, among which the outer plate and outer plate longitudinal ribs are preliminary segment loose parts. S3, small group assembly; The assembly and construction of each sub-assembly component is completed in the sub-assembly workshop; S4. The first sections are constructed and assembled on the platform using reverse tires; In the segment workshop, each segment is constructed using a deck or platform as the base surface, and the assembly of each segment is completed before simple fillet welding is performed. Multiple preliminary sections can be constructed simultaneously on fixed jigs inside the section workshop, ensuring that several stepped preliminary sections can be completed at the same time, effectively shortening the overall construction time of the sections. S5. The bottom-level pre-segment is positioned and installed on the transfer platform. After flipping over the bottommost pre-section, the positive tire is installed and positioned on the transfer platform at the exit of the section workshop; the positive tire assembly of the whole section is completed at the workshop exit using the transfer platform, and the final welding of the section is carried out in the field outside the workshop. The transfer platform includes a platform panel, which is set on a grid-like planar bracket composed of multiple platform crossbeams and platform longitudinal girders. Two rows of platform columns are set below the platform panel to support the entire transfer platform. After the bottommost pre-section is completed with fillet welding, it is flipped over and placed on the transfer platform at the exit of the section workshop. Then, after the fillet welding of the upper pre-section is completed, the flipped over and placed on the bottom pre-section of the transfer platform. The multi-layer stepped structure is installed layer by layer from bottom to top. S6. The upper-level pre-segment is installed on the transfer platform; After flipping over the upper-level pre-assembly section, it is installed on the lower-level pre-assembly section on the transfer platform at the exit of the section workshop, completing the tire installation and assembly work of the entire section in the large assembly stage. S7. Transport to the field for welding; The transfer platform, along with the sections, is transported to the outdoor area of ​​the section workshop using transport vehicles for final fillet welding, completing all construction work before section painting.

2. The method for constructing a segmented formwork for a ship's large-line step according to claim 1, characterized in that: In step S1, when dividing the structure into multiple preliminary sections in the height direction using the deck or platform as the interface, the outer plate of the lower section near the side of the hull must extend more than 200 mm beyond the platform plate. The structure of the upper section is divided by the platform plate as the interface, which facilitates the upward hoisting and positioning of the upper single-layer large linear step preliminary section from top to bottom and its installation on the lower step preliminary section.

3. The method for constructing a segmented formwork for a ship's large-line step according to claim 1, characterized in that: In step S1, the height of each preliminary segment shall not exceed the height of one container bay.

4. The method for constructing a segmented formwork for a ship's large-line step according to claim 1, characterized in that: In step S3, the installation and welding of parts such as decks or platforms, various ribs, various longitudinal wall panels and aggregates are carried out on a fixed jig inside the workshop, using a small plate frame as the base surface.

5. The method for constructing a segmented formwork for a ship's large-line step according to claim 1, characterized in that: In step S4, the preliminary segmented construction of a stepped structure is carried out on a fixed jig inside the segmented workshop, using the deck or platform group assembly components as the base surface for reverse jig construction. Various rib plates and longitudinal wall panels group assembly components and some segmented loose parts are installed. Finally, the outer plate longitudinal ribs, outer plates and fillet welds are installed.

6. The method for constructing a segmented formwork for a ship's large-line step according to claim 1, characterized in that: In step S5, if the vertical position of the segment's center of gravity exceeds the lower step structure of the segment, then temporary supports are added at the edge of the uppermost step structure segment to increase the overall stability of the segment.

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