A design method for welded joints of keel reinforcement in large container ships

Abstract

This invention discloses a design method for welding joints of the keel in a large container ship. The method specifically includes the following steps: S1, determining the butt joint position of the keel in the stern tube segment and the keel in the upper segment of the stern tube, and fabricating the port and starboard outer plates on both sides of the keel butt joint as loose components; S2, assembling the upper segment of the stern tube and the stern tube segment in sections; S3, welding the keel in the upper segment of the stern tube to the keel in the stern tube segment, completing the butt welding of the keel; S4, hoisting the port and starboard outer plates above the stern tube segment and welding them to the stern tube segment; completing the assembly welding of the stern tube segment. This invention avoids weld overlap by staggering the butt joints of the keel and the outer plates, ensuring the structural strength of the welded joint meets welding requirements and guaranteeing structural strength and ship safety.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, specifically relating to a design method for welded joints of keel reinforcement in large container ships. Background Technology

[0002] During shipbuilding, extremely high welding quality is required for thick plate areas and areas with complex welded structures. In large container ships, the welding areas between the keel and the outer plate at the bow and stern have outer plate thicknesses exceeding 40mm, resulting in complex structures and placing high demands on the welding work.

[0003] The traditional method for welding the bow and stern midline keel areas of large container ships is to construct according to the detailed design drawings. However, the butt welds of the midline keel overlap with the joints of the outer plate and the corner joints of the midline keel and the outer plate, which affects the welding quality. The impact of weld overlap on the welding quality is not considered. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a design method for the welding joint of the keel in a large container ship. This invention avoids the overlap of welds by staggering the butt joint of the keel and the butt joint of the outer plate, so that the structural strength of the welding joint meets the welding requirements and ensures the structural strength and ship safety.

[0005] To achieve the above-mentioned objectives, the technical solution provided by this invention patent is as follows:

[0006] A design method for welded joints of reinforcing bars in large container ships, the method specifically includes the following steps:

[0007] S1, determine the position of the joint between the middle keel of the stern tube section and the middle keel of the upper section of the stern tube, and fabricate the port and starboard outer plates on both sides of the joint of the middle keel into loose parts;

[0008] S2, hoist the upper section of the stern tube to the top of the stern tube segment, and install the upper section of the stern tube and the stern tube segment separately;

[0009] S3, After the upper section of the stern tube is assembled with the stern tube segment, the middle rib of the upper section of the stern tube is assembled and welded with the middle rib of the stern tube segment. The butt joint of the middle rib of the upper section of the stern tube and the middle rib of the stern tube segment is welded and fixed to complete the butt welding of the middle rib.

[0010] S4. Hoist the completed port and starboard outer plates onto the stern tube section and weld them to the stern tube section. Then, weld the port and starboard outer plates to the center ribs of the upper stern tube section and the center ribs of the stern tube section, respectively, to complete the mounting and welding of the stern tube section.

[0011] Furthermore, the upper end of the port hull outer plate is higher than the height of the joint between the central keel and the outer plate, while the lower end of the port hull outer plate is lower than the height of the joint between the central keel and the outer plate; the starboard hull outer plate is symmetrically arranged on both sides of the joint between the central keel and the port hull outer plate.

[0012] Furthermore, the joint between the upper section of the stern tube and the plate seam where the stern tube is segmented and welded together is at the same height as the joint between the outer plate of the left line and the outer plate of the stern tube segmented and welded together.

[0013] Furthermore, when the central rib of the upper section of the stern tube is welded to the central rib of the stern tube segment, the central rib of the upper section of the stern tube is first welded and fixed to the outer plates on both sides of the upper section of the stern tube, with the lower end of the central rib of the upper section of the stern tube higher than the height of the outer plate seam; then the central rib of the stern tube segment is welded and fixed to the outer plates on both sides of the stern tube segment, with the upper end of the central rib of the stern tube segment connected to the lower end of the central rib of the upper section of the stern tube; after the central rib of the upper section of the stern tube is installed, the butt joint of the central rib of the upper section of the stern tube and the central rib of the stern tube segment is welded and fixed; thus completing the welding of the central rib butt joint.

[0014] Furthermore, after the welding of the joint of the central keel is completed, the port and starboard outer plates on both sides of the joint of the central keel are installed separately, and the port outer plate is square in shape; the port outer plate is corner welded to the central keel.

[0015] Furthermore, the joint between the port and starboard outer plates and the upper end of the stern tube section is 100mm lower than the joint of the central keel.

[0016] Based on the above technical solution, the design method of the keel welding node in a large container ship according to this invention patent has achieved the following technical advantages through practical application:

[0017] 1. The present invention provides a design method for welding joints of the keel in a large container ship. By staggering the butt joints of the keel and the outer plate, the overlap of welds is avoided, ensuring that the structural strength of the welding joint meets the welding requirements and guaranteeing the structural strength and ship safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the segmented structure of the stern tube area in the design method of the keel welding node in a large container ship according to the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0020] This invention not only enables the pre-outfitting integrity of sections and overall sections, greatly reducing the outfitting workload in the engine room and bilge area during the dock construction phase, and improving the dock working environment and safe production environment, but also eliminates the interference between the structure and outfitting in the original dock hoisting process, thereby significantly improving the efficiency of section hoisting and further shortening the dock construction cycle.

[0021] like Figure 1 The present invention pertains to a design method for welded joints of reinforcing bars in large container ships, and the method specifically includes the following steps:

[0022] S1, determine the position of the joint between the middle keel 32 of the stern tube section and the middle keel 31 of the upper section of the stern tube, and manufacture the port and starboard outer plates 2 on both sides of the joint of the middle keel as loose parts;

[0023] S2, hoist the upper section 1 of the stern tube to the top of the stern tube section 5, and install the upper section 1 of the stern tube and the stern tube section 5 in sections;

[0024] S3, after the upper section 1 of the stern tube and the stern tube segment 5 are assembled, the middle rib of the upper section 1 of the stern tube and the middle rib of the stern tube segment 5 are assembled and welded together, and the butt joint of the middle rib of the upper section 1 of the stern tube and the middle rib of the stern tube segment 5 is welded and fixed to complete the butt welding of the middle rib.

[0025] S4. Hoist the completed port and starboard outer plates 2 onto the stern tube section 5 and weld them to the stern tube section 5. Then weld the port and starboard outer plates 2 to the center ribs of the upper stern tube section 1 and the center ribs of the stern tube section 5 respectively. The mounting and welding of the stern tube section 5 is completed.

[0026] By staggering the joints of the inner rib and the outer plate, the overlap of welds is avoided, ensuring that the structural strength of the welded joint meets the welding requirements and guaranteeing the structural strength and ship safety.

[0027] The upper end of the left hull outer plate is higher than the height of the joint between the central keel and the outer plate, and the lower end of the left hull outer plate is lower than the height of the joint between the central keel and the outer plate; the starboard hull outer plate 2 is symmetrically arranged on both sides of the joint between the central keel and the left hull outer plate.

[0028] The joint between the upper section 1 of the stern tube and the section 5 of the stern tube is at the same height as the joint between the outer plate of the left line and the outer plate of the stern tube section 5.

[0029] When welding the central rib of the upper section 1 of the stern tube to the central rib of the stern tube section 5, firstly, the central rib of the upper section 1 of the stern tube is welded and fixed to the outer plates on both sides of the upper section 1 of the stern tube, with the lower end of the central rib of the upper section 1 of the stern tube higher than the height of the outer plate seam; then, the central rib of the stern tube section 5 is welded and fixed to the outer plates on both sides of the stern tube section 5, with the upper end of the central rib of the stern tube section 5 connected to the lower end of the central rib of the upper section 1 of the stern tube; after the installation of the central rib of the upper section 1 of the stern tube and the central rib of the stern tube section 5 is completed, the butt joint of the central rib of the upper section 1 of the stern tube and the central rib of the stern tube section 5 is welded and fixed; thus completing the welding of the central rib butt joint.

[0030] After the welding of the joint of the central keel is completed, the port and starboard outer plates 2 on both sides of the joint of the central keel are installed respectively. The port outer plate is square in shape. The port outer plate is corner welded to the central keel.

[0031] The joint between the port and starboard outer plates 2 and the upper end of the stern tube section 5 is 100mm lower than the joint between the central reinforcing bars.

[0032] After the outer plate seams and the middle keel seams are welded, weld inspection is required. Staggering the outer plate seams and the middle keel seams facilitates weld inspection, improves work efficiency, and shortens the construction cycle.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A design method for welded joints of reinforcing bars in large container ships, characterized in that, The method specifically includes the following steps: S1, determine the position of the joint between the middle keel of the stern tube section and the middle keel of the upper section of the stern tube, and fabricate the port and starboard outer plates on both sides of the joint of the middle keel into loose parts; S2, hoist the upper section of the stern tube to the top of the stern tube segment, and install the upper section of the stern tube and the stern tube segment separately; S3, After the upper section of the stern tube is assembled with the stern tube segment, the middle rib of the upper section of the stern tube is assembled and welded with the middle rib of the stern tube segment. The butt joint of the middle rib of the upper section of the stern tube and the middle rib of the stern tube segment is welded and fixed to complete the butt welding of the middle rib. When welding the central rib of the upper section of the stern tube to the central rib of the stern tube segment, firstly, weld the central rib of the upper section of the stern tube to the outer plates on both sides of the upper section of the stern tube, with the lower end of the central rib of the upper section of the stern tube higher than the height of the outer plate seam; then, weld the central rib of the stern tube segment to the outer plates on both sides of the stern tube segment, with the upper end of the central rib of the stern tube segment connected to the lower end of the central rib of the upper section of the stern tube; after the installation of the central rib of the upper section of the stern tube and the central rib of the stern tube segment is completed, weld the butt joint of the central rib of the upper section of the stern tube and the central rib of the stern tube segment to fix it; thus completing the welding of the central rib butt joint. S4. Hoist the completed port and starboard outer plates onto the stern tube section and weld them to the stern tube section. Then weld the port and starboard outer plates to the center ribs of the upper stern tube section and the center ribs of the stern tube section, respectively. Complete the mounting and welding of the stern tube section. The upper end of the port hull plating is higher than the height of the joint between the central keel and the keel; the lower end of the port hull plating is lower than the height of the joint between the central keel and the keel; the starboard hull plating is symmetrically arranged on both sides of the joint between the central keel and the port hull plating. The joint between the upper section of the stern tube and the plate seam where the stern tube is segmented and welded is at the same height as the joint between the port side outer plate and the outer plate seam where the stern tube is segmented and welded. The joint between the port and starboard outer plates and the upper end of the stern tube section is 100mm lower than the joint of the central keel.

2. The design method for welded joints of reinforcing bars in a large container ship according to claim 1, characterized in that, After the joint of the central keel is welded, the port and starboard outer plates on both sides of the joint of the central keel are installed separately. The port outer plate is square in shape. The port outer plate is corner welded to the central keel.

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