Large LNG ship stern strong frame structure and manufacturing method

Abstract

The application discloses a large-scale LNG ship bilge strong frame structure, which comprises an upper small group, a central group and a lower small group, the upper end of the central group is provided with the upper small group, the lower end of the central group is provided with the lower small group, the central group comprises a strong frame knee plate, a large rib plate opening and a partition rib, the middle part of the end face of the strong frame knee plate is provided with the large rib plate opening, the end face of the strong frame knee plate around the large rib plate opening is provided with the annular partition rib, and the strong frame knee plate is integrally formed. The strong frame structure is integrally manufactured, the large-hole structure is adopted on the strong frame, the design can reduce the panel between the upper rib plate and the lower rib plate, the structure is simpler, and the production cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, specifically relating to a strong frame structure for the bilge of a large LNG ship and its manufacturing method. Background Technology

[0002] In conventional designs, the bilge structure of the cargo hold area of ​​an LNG carrier typically uses welded joints. The advantage of this design is that it simplifies the segmentation. However, during construction, the alignment of the plate thickness is crucial and requires high precision. Therefore, the upper and lower structures of the bilge are made into two smaller segments.

[0003] This invention proposes an information node design scheme, which changes the node to a circular form, reducing the problem of three-way alignment and simplifying the installation of the node. It also changes the form and structural arrangement of the bilge strong frame (rib plate), which is revolutionary for the design and manufacturing method of the structure. Especially in the manufacturing stage, the division and use of small segments can quickly and conveniently manufacture the segment. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a strong frame structure for the bilge of a large LNG ship and a manufacturing method thereof.

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

[0006] A strong frame structure for the bilge of a large LNG carrier includes an upper sub-assembly, a central sub-assembly, and a lower sub-assembly. The upper sub-assembly is installed at the upper end of the central sub-assembly, and the lower sub-assembly is installed at the lower end of the central sub-assembly. The central sub-assembly includes a strong frame elbow plate, a large opening in the rib plate, and partition ribs. The strong frame elbow plate has a large opening in the middle of its end face, and annular partition ribs are provided on the end face of the strong frame elbow plate around the large opening in the rib plate. The strong frame elbow plate is integrally formed.

[0007] Furthermore, the strong frame elbow plate includes a diagonal segment, an outer plate segment, a bilge segment, and a bottom segment. The upper end of the diagonal segment is connected to the longitudinal rib of the outer plate, the bottom end of the diagonal segment is connected to the bottom segment, the lower end of the outer plate segment is connected to the bilge segment, and one side of the bilge segment is connected to the bottom segment. The diagonal segment, outer plate segment, bilge segment, and bottom segment surround the large opening of the rib plate, and multiple longitudinal ribs are respectively provided at the outer ends of the diagonal segment, outer plate segment, bilge segment, and bottom segment.

[0008] Furthermore, the lower side of the oblique segment is connected to the side of the lower sub-assembly, and a side longitudinal truss is provided at the connection between the oblique segment and the lower sub-assembly. The oblique segment and the lower sub-assembly are connected by a turning node with a radius of 100mm.

[0009] Furthermore, the large opening of the rib plate is generally arc-shaped triangular, with an upper opening radius of 600mm, a lower opening radius of 800mm, and an opening radius of 3000mm for the section of the rib plate near the bilge.

[0010] Furthermore, an opening hoop is welded to the inner side of the large opening of the rib plate, and the opening hoop is made of flat steel.

[0011] Furthermore, the dividing ribs surround the large opening of the rib plate, and the dividing ribs are equidistant from the large opening of the rib plate.

[0012] Furthermore, multiple anti-rollover elbows are provided in the diagonal segment, outer plate segment, bilge segment, and bottom segment. One end of the anti-rollover elbow is perpendicularly connected to the longitudinal bone, and the other end of the anti-rollover elbow is perpendicularly connected to the opening hoop. Reinforcing ribs are provided on both sides of the anti-rollover elbow to connect the anti-rollover elbow to the longitudinal bone.

[0013] A method for manufacturing a strong frame structure for the bilge section of a large LNG carrier, the method specifically includes the following steps:

[0014] S1. The upper sub-assembly, lower sub-assembly, and central assembly are manufactured separately. The central assembly is then constructed in reverse on a jig. After the outer plate segments, bilge outer plate segments, bilge bottom plate segments, and bottom plate segments of the central assembly are constructed separately, they are assembled onto the central assembly.

[0015] S2. After the central assembly is manufactured, the upper and lower sub-assemblies are hoisted onto the central assembly.

[0016] Furthermore, the specific steps of constructing the central assembly in S1 are as follows: the construction is carried out using the diagonal plate on the central assembly as the base surface, the diagonal plate is placed on the jig, the rib plate is installed on the diagonal plate, and then the outer plate segment and the bottom plate segment are hoisted, followed by the installation of the bilge bottom plate segment and the bilge outer plate segment.

[0017] Based on the above technical solution, the present invention patent's large LNG ship bilge reinforcement frame structure and manufacturing method has achieved the following technical advantages through practical application:

[0018] 1. The present invention discloses a bilge strong frame structure for a large LNG ship. The bilge strong frame structure is manufactured as a single unit, and the strong frame adopts a structure with large holes. This design can reduce the number of panels between the upper and lower ribs compared to the original design, making the structure simpler and reducing production costs.

[0019] 2. The present invention provides a strong frame structure for the bilge section of a large LNG ship, which connects the diagonal side sections and the lower sub-sections through rounded joints. The Z-direction steel required around the original joints to prevent lamellar tearing can be completely eliminated, saving ship construction costs.

[0020] 3. The present invention provides a bilge strong frame structure for large LNG ships by setting the large openings of the ribs with rounded triangular structures, which avoids stress concentration in the bilge strong frame structure and improves the construction quality of the bilge strong frame structure. Attached Figure Description

[0021] Figure 1 This is a diagram of a conventional bilge reinforcement frame structure in a large LNG ship bilge reinforcement frame structure according to the present invention.

[0022] Figure 2 This is a structural diagram of the bilge reinforcement frame in a large LNG ship bilge reinforcement frame structure according to the present invention.

[0023] Figure 3 This invention relates to a reinforcing frame structure for the bilge section of a large LNG carrier. Figure 2 AA section view in the image.

[0024] Figure 4 This invention relates to a reinforcing frame structure for the bilge section of a large LNG carrier. Figure 2 Enlarged view of point B in the image.

[0025] Figure 5 This invention relates to a reinforcing frame structure for the bilge section of a large LNG carrier. Figure 2 CC section view in the image.

[0026] Figure 6 This is an assembly diagram of the bilge reinforcement frame structure in a large LNG ship reinforcement frame structure according to the present invention.

[0027] Figure 7 This is a flowchart illustrating the central assembly construction process of a bilge reinforcement frame structure for a large LNG carrier according to the present invention. Detailed Implementation

[0028] 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.

[0029] like Figure 1-7 The present invention pertains to a strong frame structure for the bilge of a large LNG carrier. This structure includes an upper sub-assembly 9, a central sub-assembly 10, and a lower sub-assembly 11. The upper sub-assembly 9 is installed at the upper end of the central sub-assembly 10, and the lower sub-assembly 11 is installed at the lower end of the central sub-assembly 10. The central sub-assembly 10 includes a strong frame elbow plate 1, a large rib opening 2, and a partition rib 4. The large rib opening 2 is located in the middle of the end face of the strong frame elbow plate 1, and annular partition ribs 4 are provided on the end face of the strong frame elbow plate 1 around the large rib opening 2. The strong frame elbow plate 1 is integrally formed.

[0030] The strong frame elbow plate 1 includes a diagonal segment, an outer plate segment, a bilge segment, and a bottom segment. The upper end of the diagonal segment is connected to the outer plate segment, the bottom end of the diagonal segment is connected to the bottom segment, the lower end of the outer plate segment is connected to the bilge segment, and one side of the bilge segment is connected to the bottom segment. The diagonal segment, outer plate segment, bilge segment, and bottom segment surround the large opening 2 of the rib plate. Multiple longitudinal bones 5 are respectively provided at the outer ends of the diagonal segment, outer plate segment, bilge segment, and bottom segment.

[0031] The lower side of the diagonal segment is connected to the side of the lower group stand 11. A side longitudinal truss 16 is provided at the connection between the diagonal segment and the lower group stand 11. The diagonal segment and the lower group stand 11 are connected by a turning node with a radius of 100mm.

[0032] Furthermore, the large opening 2 of the rib plate is generally arc-shaped triangular, with an upper opening radius of 600mm, a lower opening radius of 800mm, and an opening radius of 3000mm for the section of the rib plate near the bilge.

[0033] An opening hoop 3, which is made of flat steel, is welded to the inner side of the large opening 2 of the rib plate.

[0034] The partition rib 4 surrounds the large opening 2 of the rib plate, and the partition rib 4 is equidistant from the large opening 2 of the rib plate.

[0035] Multiple anti-tilt elbows are also provided in the diagonal segment, outer plate segment, bilge segment and bottom segment. One end of the anti-tilt elbow is perpendicularly connected to the longitudinal bone 5, and the other end of the anti-tilt elbow is perpendicularly connected to the open hoop 3. Reinforcing ribs are provided on both sides of the anti-tilt elbow to connect the anti-tilt elbow to the longitudinal bone 5.

[0036] A method for manufacturing a strong frame structure for the bilge section of a large LNG carrier, the method specifically includes the following steps:

[0037] S1, manufacture the upper sub-assembly 9, lower sub-assembly 11, and central assembly 10 separately. Construct the central assembly 10 in reverse configuration on a jig. After the outer plate segment 12, bilge outer plate segment 14, bilge bottom plate segment 15, and bottom plate segment 13 on the central assembly 10 are constructed, assemble them onto the central assembly 10.

[0038] S2. After the central assembly 10 is manufactured, the upper sub-assembly 9 and the lower sub-assembly 11 are hoisted onto the central assembly 10.

[0039] The specific steps for constructing the central assembly 10 in S1 are as follows: the central assembly 10 is constructed using the diagonal plate as the base surface. The diagonal plate is placed on the jig, and ribs are installed on the diagonal plate. Then, the outer plate segment 12 and the bottom plate segment 13 are hoisted, followed by the installation of the bilge bottom plate segment 15 and the bilge outer plate segment 14.

[0040] Among them, the upper group consists of the outer plate, inner wall, and related longitudinal ribs 5 and ribs above the segmented top platform; the lower group 11 consists of the outer plate, inner bottom plate, longitudinal ribs 5 and ribs excluding the segmented side longitudinal girders 16; the outer plate segment 12 consists of the straight section outer plate and the outer plate longitudinal ribs 5; the bilge outer plate segment 14 consists of the curved outer plate and the outer plate longitudinal ribs 5; the bottom plate segment 13 consists of the straight section bottom plate and the longitudinal ribs 5; and the bilge bottom plate segment 15 consists of the curved outer plate and the longitudinal ribs 5.

[0041] 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 robust frame structure for the bilge of a large LNG carrier, characterized in that, The structure includes an upper sub-assembly, a central sub-assembly, and a lower sub-assembly. The upper sub-assembly is installed at the upper end of the central sub-assembly, and the lower sub-assembly is installed at the lower end of the central sub-assembly. The central sub-assembly includes a strong frame elbow plate, a large opening in the rib plate, and partition ribs. The strong frame elbow plate has a large opening in the middle of its end face, and annular partition ribs are provided on the end face of the strong frame elbow plate around the large opening in the rib plate. The strong frame elbow plate is integrally formed. The strong frame elbow plate includes a diagonal segment, an outer plate segment, a bilge segment, and a bottom segment. The upper end of the diagonal segment is connected to the outer plate segment, the bottom end of the diagonal segment is connected to the bottom segment, the lower end of the outer plate segment is connected to the bilge segment, and one side of the bilge segment is connected to the bottom segment. The diagonal segment, outer plate segment, bilge segment, and bottom segment surround the large opening of the rib plate. Multiple longitudinal bones are respectively provided at the outer ends of the diagonal segment, outer plate segment, bilge segment, and bottom segment. The lower side of the diagonal segment is connected to the side of the lower sub-assembly. A side longitudinal truss is provided at the connection between the diagonal segment and the lower sub-assembly. The diagonal segment and the lower sub-assembly are connected by a circular joint with a radius of 100mm.

2. The bilge reinforcement frame structure of a large LNG ship according to claim 1, characterized in that, The large opening of the rib plate is generally arc-shaped triangular, with an upper opening radius of 600mm, a lower opening radius of 800mm, and an opening radius of 3000mm for the section of the rib plate near the bilge.

3. The bilge reinforcement frame structure of a large LNG ship according to claim 2, characterized in that, An opening hoop is welded to the inside of the large opening of the rib plate, and the opening hoop is made of flat steel.

4. The bilge reinforcement frame structure of a large LNG ship according to claim 2, characterized in that, The dividing ribs surround the large opening of the rib plate, and the dividing ribs are equidistant from the large opening of the rib plate.

5. A strong frame structure for the bilge of a large LNG ship according to claim 2, characterized in that, Multiple anti-tilt elbows are also provided in the diagonal segment, outer plate segment, bilge segment and bottom segment. One end of the anti-tilt elbow is perpendicularly connected to the longitudinal bone, and the other end of the anti-tilt elbow is perpendicularly connected to the open hoop. Reinforcing ribs are provided on both sides of the anti-tilt elbow to connect the anti-tilt elbow to the longitudinal bone.

6. A method for manufacturing a strong frame structure for the bilge of a large LNG carrier, employing a strong frame structure for the bilge of a large LNG carrier as described in any one of claims 1-5, characterized in that, The method specifically includes the following steps: S1. The upper sub-assembly, lower sub-assembly, and central assembly are manufactured separately. The central assembly is then constructed in reverse on a jig. After the outer plate segments, bilge outer plate segments, bilge bottom plate segments, and bottom plate segments of the central assembly are constructed separately, they are assembled onto the central assembly. S2. After the central assembly is manufactured, the upper and lower sub-assemblies are hoisted onto the central assembly.

7. A method for manufacturing a strong frame structure for the bilge of a large LNG ship according to claim 6, characterized in that, The specific steps for constructing the central assembly in S1 are as follows: the construction is carried out using the diagonal side plate on the central assembly as the base surface. The diagonal side plate is placed on the jig, and ribs are installed on the diagonal side plate. Then, the outer plate segment and the bottom plate segment are hoisted, and finally, the bilge bottom plate segment and the bilge outer plate segment are installed.

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