Novel cross section structure of ultra-large crude oil ship and ultra-large crude oil ship

Abstract

The invention discloses a novel cross section structure of an ultra-large crude oil ship and the ultra-large crude oil ship. The novel cross section structure comprises a plurality of transverse supporting materials, and the transverse supporting materials are sequentially and vertically arranged in a cargo oil tank at equal intervals in the height direction of a ship body; one side of the transverse horizontal truss in the length direction is arranged at the center of each transverse supporting material, and a safety protection device is arranged on the other side of the transverse horizontal truss in the length direction; the cargo hold longitudinal channel is arranged on the longitudinal bulkhead in the cargo oil tank or the longitudinal bulkhead of the inner shell, and is at the same height as the transverse horizontal truss; the vertical girders are arranged on the two sides of the interior of the cargo oil tank and connected with the transverse supporting materials. The problems that in order to cope with extreme working conditions, the vertical girder is large in structural weight and high in construction cost, and the curved surface of the panel of the vertical girder is difficult to machine can be solved.

Description

Technical Field

[0001] This application relates to the technical field of ship design and manufacturing, and particularly relates to a new cross-sectional structure of a very large crude carrier and a very large crude carrier. Background Art

[0002] A very large crude carrier (VLCC) generally refers to a ship for transporting crude oil with a deadweight tonnage of 300,000 tons. Due to its huge crude oil loading capacity, the cargo hold usually has a large volume, and the ship width is close to 60m. To reduce the impact of the free surface of the crude oil on stability, three cargo oil tanks, namely two side cargo oil tanks and one middle cargo oil tank, are usually arranged transversely along the hull. When the loading heights of the left and right side cargo oil tanks on both sides of the longitudinal bulkhead are different from the loading height of the middle cargo oil tank between the two longitudinal bulkheads, the two longitudinal bulkheads bear the load of the height difference of the cargo oil liquids on both sides. The extreme state is that the left and right side cargo oil tanks are empty and the middle cargo oil tank is full. At this time, the height difference is the largest, resulting in the largest load borne by the two longitudinal bulkheads. This requires the vertical girders supporting the longitudinal bulkheads to have sufficient strength. However, since the molded depth of a very large crude carrier is close to or exceeds 30m, and the deepest position of the cargo hold is about 28m, the span of the vertical girders is huge. As Figure 3 shown, the usual design is to set a transverse brace on the vertical girder at half of the depth of the side cargo oil tank or the middle cargo oil tank to shorten the span of the vertical girder.

[0003] Most of the typical cross-sections of the very large crude carriers currently under design, construction, and operation adopt a structure with a single transverse brace located in the middle cargo oil tank or the two side cargo oil tanks. The transverse brace is located at half of the depth of the cargo oil tank, resulting in a relatively large span for the upper and lower parts of the vertical girder. For the uneven loading condition on the left and right sides of the cargo hold, the stress and deformation of the vertical girder are relatively large. In particular, the bottom bracket of the vertical girder bears most of the stress transmitted from top to bottom of the vertical girder, resulting in relatively large thicknesses of the web and the face plate of the bottom bracket that constitutes the vertical girder. Among them, the thicker the face plate, the more difficult its curved surface processing is, and its structural weight is also relatively large, and the construction cost is relatively high. Summary of the Invention

[0004] In view of this, the main purpose of this application is to provide a new cross-sectional structure of a very large crude carrier and a very large crude carrier, which is beneficial to solving the problems of large structural weight, high construction cost, and difficult curved surface processing of the face plate of the vertical girder for coping with extreme working conditions.

[0005] In a first aspect, the present application provides a novel transverse section structure for a very large crude oil carrier. Two longitudinal bulkheads are arranged along the length direction of the hull of the very large crude oil carrier, dividing the cargo oil tanks of the very large crude oil carrier into side cargo oil tanks located on both sides of the hull and a middle cargo oil tank located in the middle of the hull. Among them, the novel transverse section structure arranged in the side cargo oil tank and / or the middle cargo oil tank includes:

[0006] A plurality of transverse braces, which are respectively and vertically arranged at equal distances in sequence along the height direction of the hull inside the cargo oil tank;

[0007] A transverse horizontal girder, one side of which is arranged at the center of each of the transverse braces along its length direction, and a safety protection device is arranged on the other side along the length direction of the transverse horizontal girder;

[0008] A cargo hold longitudinal passage, which is arranged on the longitudinal bulkhead or the inner shell longitudinal bulkhead inside the cargo oil tank and at the same height as the transverse horizontal girder;

[0009] Vertical girders, which are arranged on both sides inside the cargo oil tank, and the vertical girders are connected to the transverse braces.

[0010] From the above, inside the side cargo oil tank and / or the middle cargo oil tank, along the height direction of the hull, a plurality of transverse braces are vertically arranged at equal distances, and the transverse braces are arranged on the vertical girders, which not only reduces the span of the vertical girders, optimizes the force distribution, and reduces the risk of stress concentration, but also effectively reduces the size of the structural members of the vertical girders and the size of the bottom brackets of the vertical girders during the ship design process, thereby effectively reducing the structural weight of the vertical girders. Moreover, the design of the plurality of transverse braces also reduces the risk of structural fatigue damage and improves the ship safety, especially applicable to very large oil tankers for long-term voyages; the transverse horizontal girder is connected to the center position on one side of the transverse brace, enhancing the lateral bending resistance of the transverse brace, helping to disperse the load, and improving the overall structural stability; the cargo hold longitudinal passage is arranged on the longitudinal bulkheads on both sides inside the cargo oil tank and at the same height as the transverse horizontal girder, providing a safe passage path for maintenance personnel, and a safety protection device is arranged on one side of the cargo hold longitudinal passage to ensure the safety of personnel operations.

[0011] Optionally, the connection between the vertical girder and the transverse brace includes:

[0012] Both ends of the transverse brace are respectively connected to the two vertical girders by chamfered arcs.

[0013] From the above, the connection between the transverse brace and the vertical girder is connected by a chamfered arc, and the chamfered arc connection reduces the stress concentration area, thereby reducing the risk of fatigue failure of local materials; the circular arc design at the connection not only increases the contact area of the connection point but also enhances the structural stability.

[0014] Optionally, first brackets are symmetrically assembled on the upper surface and the lower surface of the transverse horizontal girder, and the transverse horizontal girder is connected to the transverse brace.

[0015] As described above, the symmetrical assembly of the first brackets increases the connection strength between the transverse horizontal girder and the transverse brace. As a kind of reinforcement, the first brackets can not only effectively resist the deformation caused by various loads, but also improve the rigidity and stability of the whole structure; and the symmetrical assembly of the first brackets can also disperse the forces acting on the transverse horizontal girder and avoid stress concentration.

[0016] Optionally, along the length direction of the transverse horizontal girder, the number of the first brackets arranged on the upper surface of the transverse horizontal girder is 4, and the number of the first brackets arranged on the lower surface of the transverse horizontal girder is 4.

[0017] As described above, the arrangement of 8 first brackets, that is, 4 are symmetrically assembled on the upper and lower sides, can distribute the forces acting on the transverse horizontal girder more evenly, better disperse the stress, and avoid material fatigue or damage caused by excessive local stress; and the 8 first brackets make the connection between the transverse horizontal girder and the transverse brace more firm and reliable.

[0018] Optionally, the width of the transverse horizontal girder is 900 mm.

[0019] As described above, the width of 900 mm is sufficient to provide a relatively spacious working platform for maintenance and inspection personnel, improving the operation convenience and safety of the staff and facilitating the daily maintenance work.

[0020] Optionally, a plurality of the transverse horizontal girders are arranged on the same side of a plurality of the transverse braces.

[0021] As described above, all the transverse horizontal girders are arranged on the same vertical plane of the transverse braces, which can reduce the complex spatial staggered layout; and the transverse horizontal girders arranged on the same side can also enhance the rigidity and stability of the internal structure of the side cargo oil tank and / or the middle cargo oil tank.

[0022] Optionally, the connection between the transverse horizontal girder and the longitudinal cargo hold passage is fixedly connected through a second bracket.

[0023] As described above, as a reinforcement, the second bracket can significantly enhance the strength of the connection point between the transverse horizontal girder and the longitudinal cargo hold passage, while improving the stability of the whole structure, effectively reducing the possibility of stress concentration.

[0024] Optionally, longitudinal bulkhead longitudinal stiffeners are arranged at equal intervals along the vertical direction of the longitudinal bulkhead.

[0025] As described above, the arrangement of longitudinal bulkhead stiffeners can significantly enhance the strength of the entire hull and its ability to withstand the impact of the external environment.

[0026] In a second aspect, the present application also provides a very large crude oil carrier. Among them, in the side cargo oil tank and / or the middle cargo oil tank of the very large crude oil carrier, a novel transverse section structure of the very large crude oil carrier described in any one of the first aspects is provided. In the side cargo oil tank, the position of the novel transverse section structure is set at the position of the anti-rolling bulkhead, and the novel transverse section structure replaces the anti-rolling bulkhead.

[0027] As described above, when the novel transverse section structure is arranged in the middle cargo oil tank, the arrangement of multiple transverse braces shortens the span of the vertical girder, thereby reducing the deformation and stress suffered by the vertical girder due to the uneven loading conditions of the two side cargo oil tanks on the left and right, and indirectly reducing the design weight of the bottom structure of the vertical girder; when the novel transverse section structure is arranged in the side cargo oil tanks on both sides of the hull, the novel transverse section structure replaces the traditional anti-rolling bulkhead. The novel transverse section structure can also reduce the free surface effect of the crude oil in the side cargo oil tank. The novel transverse section structure is relatively simple and can significantly improve the overall structural strength and rigidity of the side cargo oil tank area, better resisting various loads brought by the external environment.

[0028] In summary, for the novel transverse section structure of the very large crude oil carrier provided by the present application, multiple transverse braces can be arranged on the vertical girders on both sides inside the side cargo oil tank or the middle cargo oil tank in the same vertical plane to shorten the span of the vertical girder. The structure of multiple transverse braces makes the stress borne by the vertical girder more uniform, and the structure of multiple transverse braces can more effectively prevent the sloshing load of the crude oil in the cargo oil tank, thereby effectively reducing the size of the components of the vertical girder structure and further reducing the structural weight; a transverse horizontal girder with a width of 900 mm is arranged at the center of each transverse brace, and a safety protection device such as a ladder railing is added to the transverse horizontal girder to form a passage for inspecting the structural state of high-stress areas such as the rib plate arc on the PMA inspection ship; while being used for structural inspection, the longitudinal passage of the cargo hold allows the staff to reach the transverse horizontal girder through the passage of the cargo oil tank. The very large crude oil carrier provided by the present application can be provided with a novel transverse section structure at the side cargo oil tank and / or the middle cargo oil tank. Among them, the independent anti-rolling bulkhead is cancelled in the side cargo oil tank, and the novel transverse section structure is used. While ensuring the function of reducing the ship's roll caused by the free surface effect, more effective loading volume can be obtained, and the internal structure design of the cargo oil tank is also simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following further describes each technical feature of the present application and the relationships between them with reference to the accompanying drawings. The drawings are exemplary, and some technical features are not shown in actual proportions. Also, in some of the drawings, technical features that are customary in the technical field to which the present application pertains and are not essential for understanding and implementing the present application may be omitted, or technical features that are not essential for understanding and implementing the present application may be shown additionally. That is to say, the combination of the various technical features shown in the drawings is not used to limit the present application. Additionally, throughout the present application, the content referred to by the same reference numerals is also the same. The specific description of the drawings is as follows:

[0030] Figure 1 is a cross-sectional view of a novel cross-sectional structure of a very large crude oil carrier in the present application;

[0031] Figure 2 is a top view of a novel cross-sectional structure of a very large crude oil carrier in the present application;

[0032] Figure 3 is a cross-sectional view of a conventional cross-sectional structure in the present application.

[0033] Description of Reference Numerals

[0034] 1 - transverse stiffener, 2 - transverse horizontal girder, 3 - longitudinal cargo hold passage, 4 - vertical girder, 5 - longitudinal bulkhead, 6 - inner hull longitudinal bulkhead, 7 - deck strong beam, 8 - deck beam, 9 - bottom bracket.

[0035] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be a more detailed description hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by reference to specific embodiments. Detailed Embodiments

[0036] The following elaborates on the preferred embodiments of the present application in conjunction with the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making the scope of protection of the present application more clearly defined.

[0037] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0038] It should be noted that in the description herein, the orientation or positional relationships indicated by terms such as "middle", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on this application.

[0039] In addition, terms such as "installed", "set up", "provided with", "connected", "linked", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Glossary

[0041] PMA (Permanent Means of Access) refers to the permanent inspection passage, which is a very important facility on a bulk carrier. By setting up the PMA, it is convenient for classification society surveyors and crew to conduct routine inspections on the hull structure during the actual operation of the ship, thus ensuring that the hull structure condition is at a relatively good level.

[0042] Girder is a marine engineering term published in 1998, and its definition is a large composite member composed of a web and a panel.

[0043] Next, specific embodiments will be used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above technical problems. The specific embodiments described below can be combined with each other to form new embodiments. For the same or similar ideas or processes described in one embodiment, they may not be repeated in some other embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0044] In a first aspect, the present application provides a new cross-sectional structure for a very large crude oil carrier. Along the length direction of the hull of the very large crude oil carrier, two longitudinal bulkheads 5 are provided, dividing the cargo oil tanks of the very large crude oil carrier into side cargo oil tanks on both sides of the hull and a middle cargo oil tank in the middle of the hull. Among them, the new cross-sectional structure provided in the side cargo oil tank and / or the middle cargo oil tank includes:

[0045] A plurality of transverse stiffeners 1, which are respectively and vertically arranged at equal distances along the height direction of the hull inside the cargo oil tank;

[0046] A transverse horizontal girder 2, with one side of its length direction arranged at the center of each transverse stiffener 1, and a safety protection device arranged on the other side of the length direction of the transverse horizontal girder 2;

[0047] A cargo hold longitudinal passage 3, which is arranged on the longitudinal bulkhead 5 or the inner shell longitudinal bulkhead 6 inside the middle cargo oil tank and at the same height as the transverse horizontal girder 2;

[0048] Vertical girders 4, which are arranged on both sides inside the middle cargo oil tank, and the vertical girders 4 are connected to the transverse stiffeners 1.

[0049] Specifically, inside the side cargo oil tank and / or inside the middle cargo oil tank, along the height direction of the hull, a plurality of transverse stiffeners 1 are vertically arranged at equal distances, and the transverse stiffeners 1 are arranged on the vertical girders 4, which not only reduces the span of the vertical girders 4, optimizes the force distribution, and reduces the risk of stress concentration, but also effectively reduces the size of the structural members of the vertical girders 4 during the ship design process, reduces the size of the bottom brackets 9 of the vertical girders 4, and thus effectively reduces the structural weight of the vertical girders 4. Moreover, the design of a plurality of transverse stiffeners 1 also reduces the risk of structural fatigue damage and improves the ship safety, especially suitable for very large oil tankers for long-term voyages; the transverse horizontal girder 2 is connected to the center position on one side of the transverse stiffener 1, enhancing the transverse bending resistance of the transverse stiffener 1, helping to disperse the load, and improving the overall structural stability; the cargo hold longitudinal passage 3 is arranged on the longitudinal bulkheads 5 on both sides inside the cargo oil tank and at the same height as the transverse horizontal girder 2, providing a safe passage for maintenance personnel, and a safety protection device is arranged on one side of the cargo hold longitudinal passage 3 to ensure the safety of personnel operations.

[0050] Optionally, the vertical girder 4 is connected to the transverse brace 1, including: both ends of the transverse brace 1 are respectively connected to the two vertical girders 4 by chamfered arcs.

[0051] Specifically, the connection between the transverse brace 1 and the vertical girder 4 is connected by a chamfered arc. The chamfered arc connection reduces the stress concentration area, thereby reducing the risk of fatigue failure of local materials; the circular arc design at the connection not only increases the contact area of the connection point, but also enhances the structural stability.

[0052] Optionally, first brackets are symmetrically assembled on the upper and lower surfaces of the transverse horizontal girder 2, and the transverse horizontal girder 2 is connected to the transverse brace 1.

[0053] Specifically, the symmetrical assembly of the first brackets increases the connection strength between the transverse horizontal girder 2 and the transverse brace 1. As a strengthening member, the first bracket can not only effectively resist the deformation caused by various loads, but also improve the rigidity and stability of the entire structure; and the symmetrical assembly of the first brackets can also disperse the force acting on the transverse horizontal girder 2 and avoid stress concentration.

[0054] Optionally, along the length direction of the transverse horizontal girder 2, the number of the first brackets arranged on the upper surface of the transverse horizontal girder 2 is 4, and the number of the first brackets arranged on the lower surface of the transverse horizontal girder 2 is 4.

[0055] Specifically, the arrangement of 8 first brackets, that is, 4 are symmetrically assembled up and down, can distribute the force acting on the transverse horizontal girder 2 more evenly, better disperse the stress, and avoid material fatigue or damage caused by excessive local stress; and 8 first brackets make the connection between the transverse horizontal girder 2 and the transverse brace 1 more firm and reliable.

[0056] Optionally, the width of the transverse horizontal girder 2 is 900 mm.

[0057] Specifically, the width of 900 mm is sufficient to provide a relatively spacious working platform for maintenance and inspection personnel, improving the operation convenience and safety of the staff, and facilitating the daily maintenance work.

[0058] In the best embodiment of the present application, a plurality of the transverse horizontal girders 2 are arranged on the same side of a plurality of the transverse braces 1.

[0059] Specifically, all the transverse horizontal girders 2 are arranged on the same vertical plane of the transverse brace 1, which can reduce the complex spatial interleaved layout; and the transverse horizontal girders 2 arranged on the same side can also enhance the rigidity and stability of the internal structure of the side cargo oil tank and / or the middle cargo oil tank.

[0060] In another embodiment of the present application, the plurality of transverse horizontal girders 2 can also be respectively arranged on different sides of the plurality of transverse braces 1; for example, when two transverse braces 1 are provided, in the cross-section, a transverse horizontal girder 2 can be arranged on the front side of the upper transverse brace 1, and a transverse horizontal girder 2 can be arranged on the rear side of the lower transverse brace 1; when three transverse braces 1 are provided, the transverse horizontal girders 2 can be alternately arranged on the front and rear sides of the three transverse braces 1 respectively, such as a transverse horizontal girder 2 can be arranged on the front side of the upper transverse brace 1, a transverse horizontal girder 2 can be arranged on the rear side of the middle transverse brace 1, and a transverse horizontal girder 2 can be arranged on the front side of the lower transverse brace 1.

[0061] Optionally, the connection between the transverse horizontal girder 2 and the longitudinal cargo hold passage 3 is fixedly connected through a second bracket.

[0062] Specifically, as a reinforcement member, the second bracket can significantly enhance the strength of the connection point between the transverse horizontal girder 2 and the longitudinal cargo hold passage 3, while improving the stability of the entire structure, and effectively reducing the possibility of stress concentration.

[0063] Optionally, longitudinal bulkhead longitudinals are arranged at equal intervals along the vertical direction of the longitudinal bulkhead 5.

[0064] Specifically, the arrangement of the longitudinal bulkhead longitudinals can significantly improve the strength of the entire hull and enhance the ship's ability to resist the influence of the external environment.

[0065] In a second aspect, the present application also provides a very large crude oil carrier, wherein, in the side cargo oil tanks and / or the middle cargo oil tanks of the very large crude oil carrier, the novel cross-sectional structure of the very large crude oil carrier according to any one of the first aspect is provided, wherein in the side cargo oil tanks, the position of the novel cross-sectional structure is arranged at the position of the anti-rolling tank bulkhead, and the novel cross-sectional structure replaces the anti-rolling tank bulkhead.

[0066] Specifically, when the novel cross-sectional structure is arranged in the middle cargo oil tank, the arrangement of the plurality of transverse braces 1 shortens the span of the vertical girder 4, thereby reducing the deformation and stress suffered by the vertical girder 4 due to the uneven loading conditions of the two side cargo oil tanks on the left and right, and indirectly reducing the design weight of the bottom structure of the vertical girder 4; when the novel cross-sectional structure is arranged in the side cargo oil tanks on both sides of the hull, the novel cross-sectional structure replaces the traditional anti-rolling tank bulkhead. The novel cross-sectional structure can also reduce the free surface effect of the crude oil in the side cargo oil tanks. The novel cross-sectional structure is relatively simple and can significantly improve the overall structural strength and rigidity of the side cargo oil tank area, and better resist various loads brought by the external environment.

[0067] In a specific embodiment of the present application, very large crude oil carriers generally adopt a double bottom, double hull side tanks and a single deck structure. Two longitudinal bulkheads 5 divide the cargo oil tanks into two side cargo oil tanks and a middle cargo oil tank in the width direction of the hull, namely the left cargo oil tank, the middle cargo oil tank and the right cargo oil tank. In summary, the left side of the left cargo oil tank is a double hull structure, the bottom of the middle cargo oil tank is a double hull structure, and the right side of the right cargo oil tank is a double hull structure; deck beams 8 are provided at the upper part of the left cargo oil tank and the right cargo oil tank, and deck strong beams 7 are provided at the upper part of the middle cargo oil tank. At the bottom of the left cargo oil tank and the right cargo oil tank, bottom brackets 9 are provided at positions opposite to the bottom side tanks. At the bottom of the middle cargo oil tank, bottom brackets 9 are provided on the opposite sides of the two longitudinal bulkheads 5; longitudinal bulkhead longitudinal stiffeners are provided on both longitudinal bulkheads 5. Generally speaking, longitudinal stiffeners are generally arranged oppositely in the double bottom structure to enhance the strength of the hull and the ability of the very large crude oil carrier to resist the influence of the external environment.

[0068] Example 1

[0069] When the new cross-sectional structure in the present application is arranged inside the middle cargo oil tank, as Figures 1-2 shown, there are two transverse braces 1. Vertical girders 4 are respectively arranged on both sides inside the cross-section of the middle cargo oil tank. Transverse braces 1 are respectively arranged at about 1 / 3 of the tank height from the bottom of the ship and 2 / 3 of the tank height, and are chamfered and arc-connected to the vertical girders 4 on the longitudinal bulkheads 5, reducing the span of the vertical girders 4 on the longitudinal bulkheads 5. The chamfered and arc connection between the transverse braces 1 and the vertical girders 4 is completed by a rib plate with an arc structure, that is, at one end of the transverse brace 1, its top is connected to the vertical girder 4 through a rib plate with an arc structure, and the bottom of the transverse brace 1 is connected to the vertical girder 4 through a rib plate with an arc structure. Similarly, the other end of the transverse brace 1 has the same structure and will not be elaborated here.

[0070] Along the length direction of the transverse brace 1, that is, in the width direction of the hull, a transverse horizontal girder 2 is arranged at the center on one side of the transverse brace 1. The width of the transverse horizontal girder 2 is about 900 mm. A safety protection device is added on one side of the transverse horizontal girder 2. The safety protection device can be a ladder railing. One side of the transverse horizontal girder 2 is fixedly connected to the transverse brace 1, and a ladder railing is arranged on the other side of the transverse horizontal girder 2. The three form a passage for the staff to pass through, which can be used as a PMA to inspect the structural state of the high stress area at the rib arc of the vertical girder 4. The connection position between the transverse horizontal girder 2 and the transverse brace 1 is fixedly connected by symmetrically arranged first brackets. 8 first brackets can be arranged at the center position of each transverse brace 1, and every two are arranged symmetrically up and down.

[0071] On the longitudinal bulkheads 5 on both sides inside the middle cargo oil tank, longitudinal permanent passageways are provided at positions equal in height to the transverse horizontal girders 2, so that when conducting structural inspections, staff can reach the transverse horizontal girders 2 through the longitudinal permanent passageways. The connection between the longitudinal permanent passageway and the transverse horizontal girder 2 is strengthened by a second bracket.

[0072] In addition, the vertical girders 4 have openings located above the longitudinal permanent passageways. Staff can walk from one side of the vertical girders 4 to the other side through these openings; longitudinal permanent passageways are usually provided at positions on the vertical girders 4 with the opening structures for staff to walk to the positions to be inspected for structural inspections.

[0073] Inside each middle cargo oil tank, along the length direction of the hull, six groups of new cross-sectional structures can be provided. It is optimal that one group of new cross-sectional structures includes 2 - 3 transverse braces 1.

[0074] Example 2

[0075] When the new cross-sectional structure in this application is arranged inside the side cargo oil tanks, vertical girders 4 are provided in both side cargo oil tanks, and the vertical girders 4 are arranged at the middle positions along the length direction of each side cargo oil tank. The side cargo oil tanks on both sides of the hull are named the left cargo oil tank and the right cargo oil tank. The same number of transverse braces 1 are provided in the left cargo oil tank and the right cargo oil tank, and the positions of the transverse braces 1 replace the positions of the original anti-rolling bulkheads. When there are two transverse braces 1, the new cross-sectional structure is as described in Embodiment 1; when there are three transverse braces 1, the transverse braces 1 are respectively arranged at about 1 / 4 tank height position, 2 / 4 tank height position, and 3 / 4 tank height position from the bottom of the ship, and the other settings of the new cross-section are also as described in Embodiment 1.

[0076] Taking the left cargo oil tank as an example, a vertical girder 4 is provided on the inner shell longitudinal bulkhead 6 on its left side, and a vertical girder 4 is also provided on the longitudinal bulkhead 5 on the right side of the left cargo oil tank. A plurality of transverse braces 1 are arranged at equal distances on the vertical girders 4 on both sides inside the left cargo oil tank, and the connection between the transverse braces 1 and the vertical girders 4 is connected by brackets with arc shapes. A transverse horizontal girder 2 is provided on each transverse brace 1. On the inner shell longitudinal bulkhead 6 on the left side of the left cargo oil tank, a cargo hold longitudinal passageway 3 is provided at a position equal in height to the transverse horizontal girder 2; on the longitudinal bulkhead 5 on the right side of the left cargo oil tank, a cargo hold longitudinal passageway 3 is also provided at a position equal in height to the transverse horizontal girder 2.

[0077] In this application, the transverse braces 1 connected to the vertical girders 4, the transverse horizontal girders 2 provided on the transverse braces 1, the safety protection device fixedly connected to the side of the transverse horizontal girders 2, and the longitudinal permanent passage at the same height as the transverse horizontal girders 2 together constitute a set of new cross-sectional structures in this application. Generally speaking, along the length direction of the hull, a set of new cross-sectional structures are usually provided in the side cargo oil tanks, and one or more sets of new cross-sectional structures can usually be provided in the middle cargo oil tanks.

[0078] Example 3

[0079] When the new cross-sectional structure in this application is arranged inside the middle cargo oil tank and the side cargo oil tank, as described in Embodiment 1 and Embodiment 2, new cross-sectional structures are arranged inside both the middle cargo oil tank and the side cargo oil tank. Among them, a set of new cross-sectional structures are arranged at the middle position along the length direction of the side cargo oil tank, and multiple sets of new cross-sectional structures are arranged along the length direction of the middle cargo oil tank.

[0080] The cargo oil tanks of the ultra-large crude oil carrier in this application can have the new cross-sectional structures described in Embodiment 1, Embodiment 2 and Embodiment 3 above.

[0081] To sum up, for the new cross-sectional structure of the ultra-large crude oil carrier provided in this application, on the vertical girders 4 on both sides inside the side cargo oil tank or the middle cargo oil tank, multiple transverse braces 1 can be arranged on the same vertical plane to shorten the span of the vertical girders 4. The structure of the multiple transverse braces 1 makes the stress borne by the vertical girders 4 more uniform. The structure of the multiple transverse braces 1 can more effectively prevent the sloshing load of the crude oil in the cargo oil tank, thereby effectively reducing the component size of the structure of the vertical girders 4, and further reducing the structural weight; a transverse horizontal girder 2 with a width of 900 mm is arranged at the center of each transverse brace 1, and after adding a safety protection device such as a ladder railing on the transverse horizontal girder 2, a passage is formed for inspecting the structural state of high-stress areas such as the rib plate arcs on the PMA inspection ship; while the longitudinal cargo hold passage 3 is used for structural inspection, it enables the staff to reach the transverse horizontal girder 2 through the passage of the cargo oil tank. The ultra-large crude oil carrier provided in this application can be provided with a new cross-sectional structure at the side cargo oil tank and / or the middle cargo oil tank. Among them, the independent anti-rolling tank wall is cancelled in the side cargo oil tank, and the new cross-sectional structure is used. While ensuring the function of reducing the ship's roll caused by the free surface effect, more effective loading volume can be obtained, and the internal structure design of the cargo oil tank is also simplified.

[0082] Unless otherwise defined, all technical and scientific terms used throughout this application shall have the same meaning as commonly understood by those skilled in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this application or the meaning derived from the content recorded in this application shall prevail. Additionally, the terms used in this specification are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0083] Note that the above is only a preferred embodiment of this application and the technical principles applied. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of this application. Therefore, although this application has been described in more detail through the above embodiments, this application is not limited to the above embodiments only. Without departing from the technical concept of this application, more other equivalent embodiments can be included, all of which fall within the scope of protection of this application.

[0084] The above are only the embodiments of this application, and thus do not limit the patent scope of this application. Any equivalent structural transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be equally included in the scope of patent protection of this application.

Claims

1. A novel transverse section structure of a very large crude oil carrier is provided with two longitudinal bulkheads along the length direction of the hull of the very large crude oil carrier, dividing the cargo oil tanks of the very large crude oil carrier into side cargo oil tanks located on both sides of the hull and a middle cargo oil tank located in the middle of the hull. It is characterized in that, The novel cross-sectional structure provided in the side cargo oil tank and / or the middle cargo oil tank includes: A plurality of transverse braces, which are respectively and vertically arranged at equal intervals along the height direction of the hull inside the cargo oil tank; A transverse horizontal girder, one side of which is arranged at the center of each of the transverse braces along its length direction, and a safety protection device is arranged on the other side along the length direction of the transverse horizontal girder; A cargo hold longitudinal passage, which is arranged on the longitudinal bulkhead or the inner shell longitudinal bulkhead inside the cargo oil tank and at the same height as the transverse horizontal girder; Vertical girders, which are arranged on both sides inside the cargo oil tank, and the vertical girders are connected to the transverse braces.

2. The novel cross-sectional structure of the ultra-large crude oil carrier according to claim 1, characterized in that The connection between the vertical girders and the transverse braces includes: Both ends of the transverse brace are respectively connected to the two vertical girders by chamfered arcs.

3. The novel transverse section structure of the ultra-large crude oil carrier according to claim 2, characterized in that, First brackets are symmetrically assembled on the upper surface and the lower surface of the transverse horizontal girder, and the transverse horizontal girder is connected to the transverse brace.

4. The novel cross-sectional structure of the ultra-large crude oil carrier according to claim 3, characterized in that, Along the length direction of the transverse horizontal girder, the number of the first brackets arranged on the upper surface of the transverse horizontal girder is 4, and the number of the first brackets arranged on the lower surface of the transverse horizontal girder is 4.

5. The novel cross-sectional structure of the ultra-large crude oil carrier according to claim 4, characterized in that, The width of the transverse horizontal girder is 900 mm.

6. The novel cross-sectional structure of the ultra-large crude oil carrier according to claim 5, characterized in that, A plurality of the transverse horizontal girders are arranged on the same side of a plurality of the transverse braces.

7. The novel cross-sectional structure of the ultra-large crude oil carrier according to claim 6, characterized in that, The connection between the transverse horizontal girder and the cargo hold longitudinal passage is fixedly connected by a second bracket.

8. The novel cross-sectional structure of a very large crude oil carrier according to claim 1, characterized in that Longitudinal bulkhead longitudinal stiffeners are arranged at equal intervals along the vertical direction on the longitudinal bulkhead.

9. An ultra-large crude oil carrier, characterized in that, In the side cargo oil tank and / or the middle cargo oil tank of the ultra-large crude oil carrier, the novel cross-sectional structure of the ultra-large crude oil carrier according to any one of claims 1-8 is provided, wherein in the side cargo oil tank, the position of the novel cross-sectional structure is arranged at the position of the anti-rolling tank bulkhead, and the novel cross-sectional structure replaces the anti-rolling tank bulkhead.

Images