Method for modifying ship structure

Abstract

The invention relates to the technical field of ships, in particular to a ship structure modification method. The ship structure modification method comprises the following steps: S1, selecting a modification area of a ship, and dividing the modification area into a plurality of filling areas along the length direction of the modification area; and S2, preparing an inlaying part for replacing an original structure in each filling area. And S3, according to the modification sequence from the two ends to the middle in the length direction of the modification area, in each filling area, the corresponding inlaying piece is welded to the filling area after the original structure is removed till all the filling areas are filled. By the adoption of the ship structure modification method, the large-area modification area is divided into a plurality of small-area filling areas, according to the modification sequence from the two ends of the modification area to the middle in the length direction of the modification area, dismantling of an original structure and welding operation of inlaying parts are conducted in the filling areas, welding deformation of the filling areas is reduced, and the welding quality of the filling areas is improved. Therefore, welding deformation of the modification area is reduced, and normal installation and use of important equipment close to the modification area are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a method for modifying a ship structure. Background Art

[0002] During ship construction, the hull structure needs to be modified. Usually, a modification area is divided into the hull and the original structure in the modification area is removed. Then, the newly prepared patch is welded and installed in the modification area to replace the original structure. Finally, it is determined by visual inspection that there is no obvious welding deformation in the modification area.

[0003] When critical equipment is installed in an area adjacent to a modification zone, if the modification zone is small, welding deformation is relatively minor and generally does not affect the critical equipment. However, if the modification zone is large, welding deformation increases, making it difficult to maintain accurate installation of the critical equipment, impacting its installation and use. For example, when modifying the stern of a ship, if the modification zone is too large, it may cause deviations in the angle and position of the propeller axis, requiring the ship to be re-docked for repairs, increasing the ship's construction cost and lead time. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for modifying a ship structure, thereby reducing welding deformation after the ship structure is modified and ensuring normal installation and use of important equipment adjacent to the modification area.

[0005] To achieve this object, the technical solution adopted in the present invention is:

[0006] The method for modifying a ship structure comprises the following steps:

[0007] S1: Selecting a modification area of ​​a ship, and dividing the modification area into a plurality of filling areas along the length direction of the modification area;

[0008] S2: preparing a patch to replace the original structure in each of the filling areas;

[0009] S3: in each of the filling areas, the original structure is removed and then the corresponding patch is welded to the filling area in a modification order from both ends of the modified area in the length direction to the middle, until all the filling areas are filled.

[0010] As an optional solution to the ship structure modification method, in step S3, before welding the corresponding patch to each of the filling areas, a reinforcement member is provided between the non-modified area of ​​the ship and the patch to support the patch.

[0011] As an optional solution to the ship structure modification method, one end of the reinforcement is connected to the patch by spot welding, and the other end of the reinforcement is connected to the non-modification area by spot welding.

[0012] As an optional solution for the ship structure modification method, after the welding of the plurality of the patching parts is completed, all the reinforcement members are removed.

[0013] As an optional solution of the ship structure modification method, in step S3, the original structure is dismantled and the patching parts are welded alternately along the filling areas at the left and right ends of the length direction of the modification area.

[0014] As an optional solution of the ship structure modification method, in step S3, before welding the patch, the patch is moved to the corresponding filling area, and the welding position of the patch is aligned with the welding position of the filling area.

[0015] As an optional solution to the ship structure modification method, the patch is hoisted by a hoisting device or supported by a jacking device so that the welding position of the patch is aligned with the welding position of the filling area.

[0016] As an optional solution of the ship structure modification method, step S3 further includes step S4: detecting welding deformation of the filling area within the modification area, removing unqualified patching parts of the filling area, and re-welding the patching parts.

[0017] As an optional solution for the ship structure modification method, after the patch is re-welded, step S4 is repeated until the welding deformation of the modified area is qualified.

[0018] As an optional solution of the ship structure modification method, in step S4, the welding deformation of the filling area is detected by a measuring instrument.

[0019] The beneficial effects of the present invention are:

[0020] The ship structure modification method proposed by the present invention first divides the modification area into multiple filling areas along the length direction, then prepares the required patch parts for each filling area, and finally, in each filling area, according to the modification sequence from the two ends of the modification area to the middle, removes the original structure and then welds the corresponding patch parts to the filling area until all the filling areas are filled. By adopting the above-mentioned ship structure modification method, a large-area modification area is divided into multiple small-area filling areas, and the original structure is removed and the patch parts are welded in each filling area one by one according to the modification sequence from the two ends of the modification area to the middle. This reduces welding deformation in the filling area, thereby reducing welding deformation in the modification area and ensuring the normal installation and use of important equipment adjacent to the modification area. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a partial cross-sectional view of a ship provided by an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of multiple patching parts provided by an embodiment of the present invention;

[0023] Figure 3 It is a detailed flow chart of the method for modifying a ship structure provided by an embodiment of the present invention.

[0024] The names and numbers of the components in the figure are as follows:

[0025] 10. Stern; 1. Modification area; 2. Inlay; 3. Reinforcement. DETAILED DESCRIPTION

[0026] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the drawings only show portions relevant to the present invention, not all of them.

[0027] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0031] When critical equipment is installed in an area adjacent to a modification zone, if the modification zone is small, welding deformation is relatively minor and generally does not affect the critical equipment. However, if the modification zone is large, welding deformation increases, making it difficult to maintain accurate installation of the critical equipment, impacting its installation and use. For example, when modifying the stern of a ship, if the modification zone is too large, it may cause deviations in the angle and position of the propeller axis, requiring the ship to be re-docked for repairs, increasing the ship's construction cost and lead time.

[0032] To solve the above problems, Figures 1 to 3 As shown, this embodiment proposes a method for modifying a ship structure, which includes the following steps:

[0033] S1: Select the modification area 1 of the ship, and divide the modification area 1 into multiple filling areas along the length direction of the modification area 1.

[0034] S2: Prepare a patch 2 to replace the original structure in each filling area.

[0035] S3: According to the modification order from both ends of the length direction of the modification area 1 to the middle, in each filling area, after removing the original structure, the corresponding inlay 2 is welded to the filling area until all the filling areas are filled.

[0036] First, the modification area 1 is divided into multiple filling areas along the length direction. Then, the required patching parts 2 are prepared for each filling area. Finally, in each filling area, the original structure is removed and the corresponding patching parts 2 are welded to the filling area in a modification order from the two ends of the length direction of the modification area 1 to the middle, until all the filling areas are filled. By adopting the above-mentioned ship structure modification method, the large-area modification area 1 is divided into multiple small-area filling areas. In a modification order from the two ends of the length direction of the modification area 1 to the middle, the original structure is removed and the patching parts 2 are welded in each filling area one by one. This reduces the welding deformation of the filling area, thereby reducing the welding deformation of the modification area 1, and ensuring the normal installation and use of important equipment adjacent to the modification area 1.

[0037] like Figure 1 As shown, this embodiment uses the modification of the deck structure of the stern 10 of a ship as an example. In step S1, a hull model is created in the drawing software, a specific modification area 1 is selected, and then the modification area 1 is divided into multiple smaller filling areas along the length direction. It should be noted that the modification area 1 is a regular rectangle (or square), and the length direction here refers to the direction in which the long side of the modification area 1 extends (usually the length or width of the ship).

[0038] like Figure 2 As shown, in step S2, the original structure of the modified area 1 is divided into a plurality of patch parts 2, and the patch parts 2 are prepared according to their specific structures. At the same time, other bulk reinforcement structures are prepared and welded to the corresponding positions of the modified area 1 after the patch parts 2 are welded to ensure the integrity of the original structure.

[0039] In step S3, the original structure is removed and the patch 2 is welded alternately in the filling areas at the left and right ends of the modification area 1 along its length. First, in the filling area at the leftmost end of the modification area 1, the original structure of the filling area is removed, the corresponding patch 2 is moved to the filling area, and finally, the patch 2 is welded into the filling area. Then, in the filling area at the rightmost end of the modification area 1, the original structure of the filling area is removed, the corresponding patch 2 is moved to the filling area, and finally, the patch 2 is welded into the filling area. This allows the filling areas on the left and right sides of the modification area 1 to undergo structural modifications alternately, thereby ensuring a sequential modification sequence from the ends to the center along the length of the modification area 1. Since only the original structure of one of the filling areas is removed each time, the area of ​​the single structural modification is reduced, thereby reducing welding deformation.

[0040] It should be noted that in step S3, before welding the patch 2, the patch 2 is moved to the corresponding filling area, and the welding position of the patch 2 is aligned with the welding position of the filling area to avoid positional offset or misalignment of the patch 2, so as to ensure the welding quality and welding accuracy of the patch 2.

[0041] Specifically, the patch 2 is lifted by a lifting device or supported by a jacking device so that the welding position of the patch 2 is aligned with the welding position of the filling area. When the patch 2 is heavy, the patch 2 can be lifted to the corresponding filling area by the lifting equipment at the construction site, and the welding position of the patch 2 can be aligned with the welding position of the filling area by adjusting the lifting height and lifting position. When the patch 2 is light, the patch 2 can be lifted to the corresponding filling area by the jacking equipment at the construction site, and the welding position of the patch 2 can be aligned with the welding position of the filling area by adjusting the lifting height, thereby flexibly selecting different transportation support devices according to the different weights of the patch 2. Since the lifting equipment and the jacking equipment are both existing technologies, the structure and working process of the lifting equipment and the jacking equipment will not be described in detail.

[0042] To improve welding accuracy and quality, in step S3, before welding the corresponding patch 2 to each patch area, a reinforcement member 3 is installed between the unmodified area of ​​the ship and the patch 2 to support the patch 2. The reinforcement member 3 provides temporary support for the patch 2, ensuring its stability during the welding process.

[0043] Specifically, one end of the reinforcement 3 is spot-welded to the patch 2, and the other end is spot-welded to the unmodified area. The reinforcement 3 can be made of channel steel, which is inexpensive and readily available, reducing the cost of structural modification. Spot welding the reinforcement 3 to the patch 2 ensures effective support while enabling rapid installation and later removal of the reinforcement 3, improving assembly and disassembly efficiency.

[0044] It's important to note that all reinforcements 3 should be removed after the welding of multiple patching pieces 2 is complete. As the multiple patching pieces 2 are welded one by one, the number of reinforcements 3 gradually increases, providing reliable support for the patching pieces 2 and improving the stability of the welding quality. Furthermore, all reinforcements 3 are removed simultaneously, improving removal efficiency.

[0045] like Figure 3 As shown, step S3 is followed by step S4: detecting welding deformation in the patch area within the modified area 1, removing the unqualified patch parts 2 in the patch area, and re-welding the patch parts 2. If the welding deformation of some or all of the patch parts 2 in the patch area is unqualified, the patch parts 2 must be removed and welded in the unqualified patch area. It should be noted that if the welding deformation of the patch area does not affect the normal installation and use of important equipment adjacent to the modified area 1, the welding deformation of the patch area is qualified; conversely, if the welding deformation of the patch area affects the normal installation and use of important equipment adjacent to the modified area 1, the welding deformation of the patch area is unqualified.

[0046] Furthermore, after the patch 2 is re-welded, step S4 is repeated until the welding deformation of the modified area 1 is qualified. By repeating the inspection and structural modification, the welding deformation of all the patch 2 in the entire modified area 1 is qualified.

[0047] In this embodiment, in step S4, the weld deformation of the patched area is detected using a measuring instrument. Compared to visual inspection, the use of a measuring instrument improves measurement precision and accuracy. For example, the surface levelness of the modified area 1 can be measured. Alternatively, the weld deformation of the patched area can be measured by measuring the relative distance between the patch 2 and other structures in the unmodified area using a measuring instrument such as a laser rangefinder.

[0048] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for modifying a ship structure, characterized in that: The steps include: S1: selecting a modification area (1) of a ship, and dividing the modification area (1) into a plurality of filling areas along the length direction of the modification area (1); S2: preparing a patch (2) to replace the original structure in each of the filling areas; S3: According to the modification order from the two ends of the length direction of the modification area (1) to the middle, in each of the filling areas, after removing the original structure, the corresponding insert (2) is welded to the filling area until all the filling areas are filled.

2. The method for modifying a ship structure according to claim 1, characterized in that: In step S3, before welding the corresponding patch (2) to each of the filling areas, a reinforcement member (3) is provided between the non-modified area of ​​the ship and the patch (2) to support the patch (2).

3. The method for modifying a ship structure according to claim 2, characterized in that: One end of the reinforcement member (3) is connected to the patch member (2) by spot welding, and the other end of the reinforcement member (3) is connected to the non-modification area by spot welding.

4. The method for modifying a ship structure according to claim 3, characterized in that: After the welding of the plurality of patching parts (2) is completed, all the reinforcing parts (3) are removed.

5. The method for modifying a ship structure according to any one of claims 1 to 4, characterized in that: In step S3, the original structure is removed and the patching parts (2) are welded alternately in the filling areas at the left and right ends along the length direction of the modified area (1).

6. The method for modifying a ship structure according to any one of claims 1 to 4, characterized in that: In step S3, before welding the patch (2), the patch (2) is moved to the corresponding filling area, and the welding position of the patch (2) is aligned with the welding position of the filling area.

7. The method for modifying a ship structure according to claim 6, characterized in that: The patch (2) is lifted by a lifting device or supported by a jacking device, so that the welding position of the patch (2) is aligned with the welding position of the filling area.

8. The method for modifying a ship structure according to any one of claims 1 to 4, characterized in that: After step S3, the method further includes step S4: detecting the welding deformation of the filling area within the modification area (1), removing the unqualified patching parts (2) of the filling area, and re-welding the patching parts (2).

9. The method for modifying a ship structure according to claim 8, characterized in that: After the patch (2) is re-welded, step S4 is repeated until the welding deformation of the modified area (1) is qualified.

10. The method for modifying a ship structure according to claim 8, characterized in that: In step S4 , the welding deformation of the filling area is detected by a measuring instrument.

Images