Design method for keel welding joints in large container ship

Abstract

The invention discloses a design method of a keel welding joint in a large container ship, which specifically comprises the following steps of: S1, determining the position of a butt joint of a keel in a stern shaft tube section and a keel in an upper section of a stern shaft tube, and manufacturing bulk parts of a larboard outer plate and a starboard outer plate on two sides of the butt joint of the keel; s2, carrying the upper section of the stern shaft tube and the stern shaft tube sections in a segmented manner; s3, carrying and welding the middle keel of the upper section of the stern shaft tube and the middle keel of the stern shaft tube section to complete butt welding of the middle keels; s4, the larboard outer plate and the starboard outer plate are hoisted above the stern shaft tube section and are welded and fixed to the stern shaft tube section; and carrying and welding of the stern shaft tube sections are completed. The middle keel butt joint plate seam and the outer plate butt joint seam are arranged in a staggered mode, overlapping of welding seams is avoided, the structural strength of the welding joint meets the welding requirement, and the structural strength and ship safety are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of ship construction, and in particular relates to a design method for a keel welding node in a large container ship. Background Art

[0002] During the shipbuilding process, the welding quality requirements for thick plate areas and areas with complex welding structures are extremely high. In the welding area between the ribs and the outer plate at the bow and stern of large container ships, the outer plate thickness is more than 40mm and the structure is complex, which brings high requirements to the welding work.

[0003] The traditional method for welding in the bow and stern center reinforcement area of ​​large container ships is to construct according to the detailed design drawings. The butt welds of the center reinforcement overlap with the outer plate fractures and the corner welds of the center reinforcement and the outer plate, affecting the welding quality. The influence of weld overlap on welding quality is not considered. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a design method for the central reinforcement welding node of a large container ship. The present invention avoids the overlap of welds by staggering the central reinforcement butt plate seams and the outer plate butt seams, so that the structural strength of the welding node meets the welding requirements, thereby ensuring the structural strength and the safety of the ship.

[0005] In order to achieve the above invention purpose, the technical solution provided by the present invention is as follows:

[0006] A design method for a keel welding node in a large container ship, the method specifically comprising the following steps:

[0007] S1, determine the joint position of the middle rib of the stern tube segment and the middle rib of the upper section of the stern tube, and make the port outer plate and the starboard outer plate on both sides of the joint of the middle rib in bulk;

[0008] S2, hoisting the stern tube upper section to the top of the stern tube segment, and loading the stern tube upper section and the stern tube segment in sections;

[0009] S3, after the stern tube upper section and the stern tube segment are mounted, the middle dragon reinforcement of the stern tube upper section and the middle dragon reinforcement of the stern tube segment are mounted and welded, and the middle dragon reinforcement of the stern tube upper section and the middle dragon reinforcement of the stern tube segment are welded and fixed to the butt joint, and the butt welding of the middle dragon reinforcement is completed;

[0010] S4, hoist the completed port outer plate and starboard outer plate above the stern tube segment, and weld and fix them to the stern tube segment, then weld and fix the port outer plate and starboard outer plate to the middle dragon reinforcement of the upper section of the stern tube and the middle dragon reinforcement of the stern tube segment respectively; complete the mounting welding of the stern tube segment.

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

[0012] Furthermore, the plate seam between the upper section of the stern tube and the stern tube segment and the plate seam between the left line outer plate and the stern tube segment welded together are at the same height.

[0013] Furthermore, when the central dragon reinforcement of the upper section of the stern tube is mounted and welded with the central dragon reinforcement of the stern tube segment, the central dragon reinforcement of the upper section of the stern tube is firstly welded and fixed to the outer plates on both sides of the upper section of the stern tube, and the lower end of the central dragon reinforcement of the upper section of the stern tube is higher than the height of the outer plate seam; then the central dragon reinforcement on the stern tube segment is welded and fixed to the outer plates on both sides of the stern tube segment, and the upper end of the central dragon reinforcement on the stern tube segment is connected to the lower end of the central dragon reinforcement of the upper section of the stern tube; after the installation of the central dragon reinforcement of the upper section of the stern tube and the central dragon reinforcement of the stern tube segment is completed, the butt joint of the central dragon reinforcement of the upper section of the stern tube and the central dragon reinforcement of the stern tube segment is welded and fixed; the welding of the butt joint of the central dragon reinforcement is completed.

[0014] Furthermore, after the welding of the central reinforcement joint is completed, the central reinforcement joint is respectively installed with the port outer plate and the starboard outer plate on both sides of the joint, and the port outer plate is square as a whole; the port outer plate and the central reinforcement joint are corner welded.

[0015] Furthermore, the outer plate seam where the port outer plate and the starboard outer plate are butted against the upper end of the stern tube segment is 100 mm lower than the butt seam where the center rib is butted.

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

[0017] 1. The present invention provides a design method for a central reinforcement welding node of a large container ship, which avoids the overlap of welds by staggering the central reinforcement butt plate seams and the outer plate butt seams, so that the structural strength of the welding node meets the welding requirements, thereby ensuring the structural strength and the safety of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic diagram of the segmented structure of the stern tube area in a design method of a keel welding node in a large container ship. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0020] The present invention can not only realize the pre-outfitting integrity of the segment and block stages, greatly reduce the outfitting workload in the engine room bilge area during the dock construction stage, and improve the dock operating environment and safe production environment, but also eliminate the interference between the structure and the outfitting in the original dock hoisting process, thereby greatly improving the segment hoisting efficiency and further shortening the dock construction period.

[0021] like Figure 1 The present invention relates to a design method for a keel welding node in a large container ship, and the method specifically comprises the following steps:

[0022] S1, determine the joint position of the middle rib 32 of the stern tube segment and the middle rib 31 of the upper section of the stern tube, and make the port outer plate and the starboard outer plate 2 on both sides of the joint of the middle rib in bulk;

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

[0024] S3, after the stern tube upper section 1 and the stern tube section 5 are mounted, the middle dragon bar of the stern tube upper section 1 and the middle dragon bar of the stern tube section 5 are mounted and welded, and the middle dragon bar of the stern tube upper section 1 and the middle dragon bar of the stern tube section 5 are welded and fixed to the seam, and the butt welding of the middle dragon bar is completed;

[0025] S4, hoist the completed port outer plate and starboard outer plate 2 above the stern tube segment 5, and weld and fix them to the stern tube segment 5, then weld and fix the port outer plate and starboard outer plate 2 to the central dragon reinforcement of the stern tube upper segment 1 and the central dragon reinforcement of the stern tube segment 5 respectively; complete the mounting welding of the stern tube segment 5.

[0026] By staggering the butt seams of the center reinforcement and the outer plate, overlapping welds are avoided, so that the structural strength of the welded nodes meets the welding requirements, thus ensuring the structural strength and ship safety.

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

[0028] The plate seam between the upper section 1 of the stern tube and the stern tube segment 5 and the plate seam between the left line outer plate and the stern tube segment 5 for welding are at the same height.

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

[0030] After the welding of the central rib joint is completed, the central rib joint is respectively installed on the port outer plate and the starboard outer plate 2 on both sides of the joint, and the port outer plate is square as a whole; the port outer plate and the central rib joint are corner welded.

[0031] The outer plate seam where the port outer plate and the starboard outer plate 2 are butted against the upper end of the stern tube segment 5 is 100 mm lower than the butt seam of the central rib.

[0032] After the welding of the outer plate seams and the central reinforcement seams is completed, weld flaw detection is required. The outer plate seams and the central reinforcement seams are staggered to facilitate weld flaw detection, improve work efficiency and shorten the construction period.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A design method for a keel welding node in a large container ship, characterized in that: The method specifically comprises the following steps: S1, determine the joint position of the middle rib of the stern tube segment and the middle rib of the upper section of the stern tube, and make the port outer plate and the starboard outer plate on both sides of the joint of the middle rib in bulk; S2, hoisting the stern tube upper section to the top of the stern tube segment, and loading the stern tube upper section and the stern tube segment in sections; S3, after the stern tube upper section and the stern tube segment are mounted, the middle dragon reinforcement of the stern tube upper section and the middle dragon reinforcement of the stern tube segment are mounted and welded, and the middle dragon reinforcement of the stern tube upper section and the middle dragon reinforcement of the stern tube segment are welded and fixed to the butt joint, and the butt welding of the middle dragon reinforcement is completed; S4, hoist the completed port outer plate and starboard outer plate above the stern tube segment, and weld and fix them to the stern tube segment, then weld and fix the port outer plate and starboard outer plate to the middle dragon reinforcement of the upper section of the stern tube and the middle dragon reinforcement of the stern tube segment respectively; complete the mounting welding of the stern tube segment.

2. The design method of a keel welding node in a large container ship according to claim 1 is characterized in that: The upper end of the port side outer plate is higher than the height of the center rib joint, and the lower end of the left side outer plate is lower than the height of the center rib joint; the starboard side outer plate and the port side outer plate are symmetrically arranged on both sides of the center rib joint.

3. The design method of a keel welding node in a large container ship according to claim 1 is characterized in that: The plate seam between the upper section of the stern tube and the stern tube segment and the plate seam between the left line outer plate and the stern tube segment welded are at the same height.

4. The design method of a keel welding node in a large container ship according to claim 1 is characterized in that: When the central ribs of the upper section of the stern tube and the central ribs of the subsection of the stern tube are mounted and welded, the central ribs of the upper section of the stern tube are firstly welded and fixed to the outer plates on both sides of the upper section of the stern tube, and the lower end of the central ribs of the upper section of the stern tube is higher than the height of the outer plate seam; then the central ribs on the subsection of the stern tube are respectively welded and fixed to the outer plates on both sides of the subsection of the stern tube, and the upper end of the central ribs on the subsection of the stern tube is connected to the lower end of the central ribs of the upper section of the stern tube; after the installation of the central ribs of the upper section of the stern tube and the central ribs of the subsection of the stern tube is completed, the butt joint of the central ribs of the upper section of the stern tube and the central ribs of the subsection of the stern tube is welded and fixed; the welding of the central ribs to the butt joint is completed.

5. The design method of a keel welding node in a large container ship according to claim 4 is characterized in that: After the welding of the central rib to the joint is completed, the central rib is installed on the port outer plate and the starboard outer plate on both sides of the joint respectively, and the port outer plate is square as a whole; the port outer plate and the central rib are corner welded.

6. The design method of a keel welding node in a large container ship according to claim 5 is characterized in that: The outer plate seam where the port outer plate and the starboard outer plate are butted against the upper end of the stern tube segment is 100 mm lower than the butt seam of the middle dragon bar.

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