Transverse strong frame structure of top side cabin of ship

Abstract

The utility model discloses a transverse strong frame structure of a top side cabin of a ship. The ship is provided with a top side cabin, and a transverse strong frame (1) is arranged in the top side cabin. Two openings are formed in a web plate of the transverse strong frame, the two openings are distributed in the web plate in a left-right mode, and a vertical supporting material (16) is formed between the two openings; the two openings are a basic large opening (11) and an additional small opening (12) respectively, the basic large opening is located at the position, close to the outer plate (3), of the transverse strong frame, and the additional small opening is located at the position, close to the top side cabin vertical plate (4), of the transverse strong frame. The double-opening structural form can reduce the use of materials, so that the weight of the structure is reduced, a supporting material type structure is formed between the two openings, the local rigidity of the structure can be increased, the stability of the transverse strong frame is improved, and the possibility of buckling is reduced.

Description

Technical Field

[0001] The utility model relates to a ship hull structure, in particular to a transverse strong frame structure of a ship's top side tank. Background Art

[0002] Refer to Figure 1 , in the design of the existing transverse strong frame structure of the top side tank of a bulk carrier, a relatively large opening is usually provided on the web of the transverse strong frame for the purpose of reducing the structural weight. This design method involves offsetting a certain distance into the top side tank based on the deck theoretical line, the outer plate theoretical line, and the inclined plate theoretical line of the top side tank to form three new straight lines (as indicated by the arrows A1, A2, and A3 in Figure 1 ), and then forming three circular arcs (as indicated by the arrows B1, B2, and B3 in Figure 1 ) through the guide circles between these straight lines. The characteristics of this design scheme are that the large opening edge is strengthened with a flat steel type panel to relieve the stress of the structural unit at the opening edge, and a series of anti-tipping brackets or stiffeners are arranged on the web according to the requirements of specifications and finite element strength calculations.

[0003] The current problems are as follows:

[0004] In the current transverse strong frame of the top side tank of a bulk carrier, the opening structure form provided thereon is a "single opening structure". Although such a single opening structure design achieves a certain weight reduction, it is found after finite element strength analysis that this design will cause stress concentration at the circular arcs of the opening of the transverse strong frame web, especially at the first circular arc (as indicated by the arrow B1 in Figure 1 ) and the second circular arc (as indicated by the arrow B2 in Figure 1 ). This usually requires thickening the web of the transverse strong frame and the flat steel type panel at the opening edge. In addition, the finite element results show that the web of the transverse strong frame is prone to buckling problems, and a large number of buckling ribs need to be set to meet the structural strength requirements. This design not only increases the structural weight but also increases the number of structural members, which is contrary to the goal of structural design optimization. Therefore, the existing transverse strong frame has obvious disadvantages in terms of structural weight optimization and number of structural members optimization. Summary of the Invention

[0005] The purpose of the utility model is to provide a transverse strong frame structure of a ship's top side tank. The opening structure form provided on the web of the transverse strong frame is a double opening structure, so that the use of materials can be reduced, the structural weight can be reduced, the structure can be optimized, and the overall performance of the structure can be improved.

[0006] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0007] A transverse strong frame structure for the topside tank of a ship. The ship is provided with a topside tank, and there is a transverse strong frame inside the topside tank. Two openings are formed on the web of the transverse strong frame, and the two openings are distributed left and right on the web, and a vertical brace is formed between the two openings.

[0008] Further, the two openings are respectively a basic large opening and an additional small opening. The basic large opening is located at the part of the transverse strong frame close to the outer plate, and the additional small opening is located at the part of the transverse strong frame close to the vertical plate of the topside tank.

[0009] Further, an inspection passage opening is formed on the transverse strong frame.

[0010] Further, the edge of the basic large opening is sequentially enclosed by a first straight line segment, a second arc segment, a second straight line segment, a third arc segment, a third straight line segment and a first arc segment. The first straight line segment is a straight line segment obtained by offsetting a certain distance inward from the deck theoretical line into the topside tank. The second straight line segment is a straight line segment determined by rotating a vertical line clockwise by 10 - 20 degrees and keeping the minimum distance between the rotated straight line and the edge of the inspection passage opening greater than 600 mm. The third straight line segment is a straight line segment obtained by offsetting a certain distance inward from the topside tank inclined plate theoretical line into the topside tank. The first arc segment is obtained by guiding a circle between the first straight line segment and the third straight line segment. The second arc segment is obtained by guiding a circle between the first straight line segment and the second straight line segment. The third arc segment is obtained by guiding a circle between the second straight line segment and the third straight line segment.

[0011] Further, the radius of the second arc segment is greater than the radius of the first arc segment, the radius of the first arc segment is greater than the radius of the third arc segment, the length of the third straight line segment is greater than the length of the second straight line segment, and the length of the second straight line segment is greater than the length of the first straight line segment.

[0012] Further, let d1 be the distance from the upper endpoint of the second straight line segment to the outer plate, and let d2 be the distance from the lower endpoint of the second straight line segment to the outer plate. d1 > d2.

[0013] Further, the edge of the additional small opening is sequentially enclosed by a fourth straight line segment, a fifth arc segment, a fifth straight line segment and a fourth arc segment. The fourth straight line segment is a straight line segment obtained by offsetting a certain distance inward from the deck theoretical line into the topside tank. The fifth straight line segment is a straight line segment obtained by offsetting a certain distance inward from the topside tank inclined plate theoretical line into the topside tank. The fourth arc segment and the fifth arc segment are obtained by guiding circles on both sides between the fourth straight line segment and the fifth straight line segment.

[0014] Further, the radius of the fourth arc segment is greater than the radius of the fifth arc segment.

[0015] Further, a large number of stiffeners and anti-tipping brackets are provided on the web of the transverse strong frame; vertical stiffeners are provided at the bracing members.

[0016] Further, flat steel type panels are provided at the edges of both openings.

[0017] In the transverse strong frame structure of the present utility model, the opening structure form provided on the web is a double-opening structure. The beneficial effects of such a double-opening structure are as follows:

[0018] 1) The double-opening structure form can reduce the use of materials, thereby reducing the weight of the structure, and further having a positive impact on improving the fuel efficiency of the ship and reducing the operation cost;

[0019] 2) The design of the double-opening structure allows for more precise control of the stress distribution. Especially under the guidance of finite element analysis, it can ensure that the high-stress areas are properly strengthened, while the low-stress areas can reduce the use of materials, thereby improving the overall performance of the structure;

[0020] 3) By setting the double-opening structure form, a bracing member type structure is formed between the two openings, which can increase the local stiffness of the structure, improve the stability of the transverse strong frame, and reduce the possibility of buckling;

[0021] 4) Compared with the traditional large-opening design, the double-opening structure form may reduce the need for additional strengthening members, relieve the need for thickening the web and panel of the transverse strong frame structure, simplify the structure design, and reduce the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of an existing transverse strong frame structure;

[0023] Figure 2 is a schematic diagram of the transverse strong frame structure of the present utility model;

[0024] Figure 3 is a schematic diagram of the structural design of the basic large opening and additional small opening in the transverse strong frame structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present utility model will be further described below with specific embodiments:

[0026] This embodiment provides a transverse strong frame structure for the topside tank of a ship. The transverse strong frame in it adopts a double-opening structure design to optimize the structural strength and reduce the overall structural weight.

[0027] Those skilled in the art can understand that the side top tank is a specific compartment location on a bulk carrier, specifically located at the corners on both sides at the top of the cargo hold. These compartments are usually designed for specific functions, such as ballast water tanks, fresh water tanks, fuel tanks, etc. The top of the side top tank is adjacent to the main deck 2.

[0028] See Figure 2 , the side top tank is formed by enclosing the main deck 2, the outer plate 3, the side top tank vertical plate 4 and the side top tank inclined plate 5 together.

[0029] Those skilled in the art can understand that a certain number of transverse strong frames 1 are arranged in the side top tank. A transverse strong frame 1 is arranged at a certain interval along the length direction of the hull in the side top tank. These transverse strong frames 1 are used as the strong skeletons of the side top tank to form support for the side top tank.

[0030] See Figure 2 , the most important innovation of the transverse strong frame structure of this embodiment is that two openings are provided on the web of the transverse strong frame 1 (that is, Figure 2 the basic large opening 11 and the additional small opening 12 in ). That is to say, the opening structure arranged on the web is a "double-opening structure". These two openings are distributed horizontally on the web, or distributed left and right. In this way, an upright strut 16 is formed between the two openings. The support structure formed by this strut 16 can effectively improve the overall structural strength of the transverse strong frame 1 by means of tension or compression. Thus, it is not necessary to "thicken the web of the transverse strong frame" or "set a large number of buckling ribs", and the thickening range of the flat steel panel at the opening edge is small, and the structural strength requirements of the ship's side top tank can be met.

[0031] In this embodiment, for the convenience of description, the two openings are respectively called the basic large opening 11 and the additional small opening 12. The basic large opening 11 is located at the part of the transverse strong frame 1 close to the outer plate 3, and the additional small opening 12 is located at the part of the transverse strong frame 1 close to the side top tank vertical plate 4.

[0032] In addition, in order to enable the crew to pass through the side top tank for inspecting the hull structure condition, an inspection passage opening 13 is also provided on the web of the transverse strong frame 1. This inspection passage opening 13 is opened at the part of the transverse strong frame 1 close to the outer plate 3.

[0033] In addition, in order to further enhance the overall structural strength of the transverse strong frame 1, a large number of stiffeners 15 and anti-tilting brackets 14 are also arranged on the web of the transverse strong frame 1. Especially, a vertical stiffener 15 is arranged at the strut 16. In this way, the strength of the strut 16 is further enhanced.

[0034] In addition, in order to further enhance the strength at the opening edge, flat steel type panels are provided at the edges of the basic large opening 11 and the additional small opening 12.

[0035] See Figure 3 , in this embodiment, for the specific design of the basic large opening 11 and the additional small opening 12, the design method is as follows:

[0036] For the basic large opening 11,

[0037] Based on the deck theoretical line, offset inward by a distance d3 into the top side tank to obtain an offset first straight line segment (the straight line segment 1 in the figure); based on the top side tank inclined plate theoretical line, offset inward by a distance d4 into the top side tank to obtain an offset third straight line segment (the straight line segment 3 in the figure); determine the second straight line segment (the straight line segment 2 in the figure) by the method of "rotating the vertical line clockwise by 10 - 20 degrees and keeping the minimum distance between the rotated line and the edge of the inspection passage opening 13 greater than 600 mm". The distance from the upper end point of the second straight line segment to the outer plate 3 is d1, and the distance from the lower end point of the second straight line segment to the outer plate 3 is d2, and d1 > d2; a first circular arc segment (the circular arc segment 1 in the figure) is obtained by filleting between the first straight line segment and the third straight line segment, a second circular arc segment (the circular arc segment 2 in the figure) is obtained by filleting between the first straight line segment and the second straight line segment, and a third circular arc segment (the circular arc segment 3 in the figure) is obtained by filleting between the second straight line segment and the third straight line segment; the first straight line segment, the second circular arc segment, the second straight line segment, the third circular arc segment, the third straight line segment, and the first circular arc segment are enclosed in sequence, thus forming the edge of the basic large opening 11. The purpose of such design is to make the shortest distance between the edges of the basic large opening 11 and the inspection passage opening 13 larger, so as to relieve the stress of the structural units near the second circular arc segment.

[0038] For the additional small opening 12,

[0039] Based on the deck theoretical line, offset inward by a distance d5 into the top side tank to obtain an offset fourth straight line segment (the straight line segment 4 in the figure); based on the top side tank inclined plate theoretical line, offset inward by a distance d6 into the top side tank to obtain an offset fifth straight line segment (the straight line segment 5 in the figure); fillet on both sides between the fourth straight line segment and the fifth straight line segment, thereby obtaining a fourth circular arc segment (the circular arc segment 4 in the figure) and a fifth circular arc segment (the circular arc segment 5 in the figure); among them, the fourth circular arc segment is located on the side close to the outer plate 3, and the fifth circular arc segment is located on the side close to the top side tank vertical plate 4. The fourth straight line segment, the fifth circular arc segment, the fifth straight line segment, and the fourth circular arc segment are enclosed in sequence, thus forming the edge of the additional small opening 12.

[0040] In this embodiment, d1 > d2. The purpose of this design is to increase the shortest distance between the large opening 11 of the foundation and the edge of the inspection channel opening 13, thereby alleviating the stress of the structural units near the second arc segment.

[0041] It should be noted that in this embodiment, the opening form on the transverse strong frame 1 adopts a specific combination of arcs and straight lines according to the stress distribution characteristics calculated by finite element. Large arc radii are used at high stress areas, such as the first arc segment and the second arc segment, and small arc radii are used at low stress areas, such as the third arc segment, the fourth arc segment, and the fifth arc segment.

[0042] In this embodiment, the transverse strong frame 1 adopts a design with a low web height, thus solving the requirements of the code for the slenderness ratio of the web and the requirements of finite element buckling calculation.

[0043] It should be noted that the low web height means that the values of d3, d4, d5, and d6 are small. The smaller values of d3, d4, d5, and d6 result in a corresponding reduction in the calculated minimum thickness of the web. For example, when smaller values of d3, d4, d5, and d6 are adopted, the width value of the buckling panel in finite element calculation is correspondingly smaller, and the finite element buckling calculation results are more likely to meet the code criteria. Compared with the traditional design, there is no need to solve the finite element buckling strength problem by thickening the web and adding buckling stiffeners, etc.

[0044] In this embodiment, the transverse strong frame 1 adopts a design with a low web height, where d3 ≤ 800mm, d4 ≤ 900mm, d5 ≤ 800mm, and d6 ≤ 800mm, thus making it easier to meet the structural buckling requirements.

[0045] In this embodiment, according to the stress distribution characteristics calculated by finite element,

[0046] "The radius of the second arc segment" is greater than "the radius of the first arc segment",

[0047] "The radius of the first arc segment" is greater than "the radius of the third arc segment",

[0048] "The length of the third straight segment" is greater than "the length of the second straight segment",

[0049] "The length of the second straight segment" is greater than "the length of the first straight segment",

[0050] "The length of the first straight segment" is less than or equal to 1000mm,

[0051] The shape of the large opening 11 of the foundation is a droplet - like opening form "formed by enclosing the first straight segment, the second arc segment, the second straight segment, the third arc segment, the third straight segment, and the first arc segment in sequence".

[0052] In this embodiment, the "radius of the fourth arc segment" is greater than the "radius of the fifth arc segment", and the shape of the additional small opening 12 is a water-droplet-shaped opening form "sequentially enclosed by a fourth straight segment, a fifth arc segment, a fifth straight segment, and a fourth arc segment".

[0053] For the transverse strong frame structure of this embodiment, the opening structure form provided on its web is a "double-opening structure", and its advantages are as follows:

[0054] 1) The double-opening structure form can reduce the use of materials, thereby reducing the weight of the structure, and then has a positive impact on improving the fuel efficiency of the ship and reducing the operating cost.

[0055] 2) The design of the double-opening structure allows for more precise control of the stress distribution. Especially under the guidance of finite element analysis, it can ensure that high-stress areas are properly strengthened, while low-stress areas can reduce the use of materials, thereby improving the overall performance of the structure.

[0056] 3) By setting the double-opening structure form, a strut-type structure is formed between the two openings, which can increase the local stiffness of the structure, improve the stability of the transverse strong frame 1, and reduce the possibility of buckling.

[0057] 4) Compared with the traditional large-opening design, the double-opening structure form may reduce the need for additional strengthening members (such as anti-tilting brackets or stiffeners), relieve the need for thickening the web and panel of the transverse strong frame structure, simplify the structure design, and reduce the manufacturing cost.

[0058] The above are only the preferred embodiments of the present utility model, and are not used to limit the protection scope of the present utility model. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A transverse strong frame structure for the topside tank of a ship. The ship is provided with a topside tank, and there is a transverse strong frame (1) inside the topside tank; It is characterized in that: Two openings are formed on the web of the transverse strong frame (1), and the two openings are distributed left and right on the web, and a vertical brace (16) is formed between the two openings.

2. The transverse strong frame structure of the ship's topside tank according to claim 1, characterized in that: The two openings are respectively a basic large opening (11) and an additional small opening (12). The basic large opening (11) is located at the part of the transverse strong frame (1) close to the outer plate (3), and the additional small opening (12) is located at the part of the transverse strong frame (1) close to the topside tank vertical plate (4).

3. The transverse strong frame structure of the ship's topside tank according to claim 2, characterized in that: An inspection passage opening (13) is formed on the transverse strong frame (1).

4. The transverse strong frame structure of the ship's topside tank according to claim 3, characterized in that: The edge of the basic large opening (11) is sequentially enclosed by a first straight line segment, a second arc segment, a second straight line segment, a third arc segment, a third straight line segment and a first arc segment; The first straight line segment is a straight line segment obtained by offsetting a certain distance inward from the deck theoretical line into the topside tank, The second straight line segment is determined by rotating a vertical line clockwise by 10 - 20 degrees and keeping the minimum distance between the rotated straight line and the edge of the inspection passage opening (13) greater than 600 mm. The third straight line segment is a straight line segment obtained by offsetting a certain distance inward from the topside tank inclined plate theoretical line into the topside tank, The first arc segment is obtained by filleting between the first straight line segment and the third straight line segment, The second arc segment is obtained by filleting between the first straight line segment and the second straight line segment, The third arc segment is obtained by filleting between the second straight line segment and the third straight line segment.

5. The transverse stiffening frame structure of the ship's topside tank according to claim 4, characterized in that: The radius of the second arc segment is greater than the radius of the first arc segment, the radius of the first arc segment is greater than the radius of the third arc segment, the length of the third straight line segment is greater than the length of the second straight line segment, and the length of the second straight line segment is greater than the length of the first straight line segment.

6. The transverse strong frame structure of the ship's top side tank according to claim 4, characterized in that: Let d1 be the distance from the upper endpoint of the second straight line segment to the outer plate (3), and let d2 be the distance from the lower endpoint of the second straight line segment to the outer plate (3), then d1 > d2.

7. The transverse strong frame structure of the ship's topside tank according to claim 4, characterized in that: The edge of the additional small opening (12) is sequentially enclosed by a fourth straight line segment, a fifth arc segment, a fifth straight line segment and a fourth arc segment; The fourth straight line segment is a straight line segment obtained by offsetting a certain distance inward from the deck theoretical line into the topside tank, The fifth straight line segment is a straight line segment obtained by offsetting a certain distance inward from the topside tank inclined plate theoretical line into the topside tank, The fourth arc segment and the fifth arc segment are obtained by filleting on both sides between the fourth straight line segment and the fifth straight line segment.

8. The transverse stiffening frame structure of the ship's topside tank according to claim 7, characterized in that: The radius of the fourth arc segment is greater than the radius of the fifth arc segment.

9. The transverse strong frame structure of the ship's topside tank according to claim 1, characterized in that: Numerous stiffeners (15) and anti - tipping brackets (14) are arranged on the web of the transverse strong frame (1); Vertical stiffeners (15) are arranged at the brace (16).

10. The transverse strong frame structure of the ship's topside tank according to claim 1, characterized in that: Flat steel form panels are arranged at the edges of the two openings.

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