Anti-fatigue structure of the connection between transverse bulkhead and longitudinal bulkhead of the engine room shed of car ro-ro ship

Abstract

The present invention discloses an anti-fatigue structure at the connection of the transverse bulkhead and the longitudinal bulkhead of the cabin shed of a car roll-on / roll-off ship. At the intersection of the transverse bulkhead and the longitudinal bulkhead, the transverse bulkhead and the longitudinal bulkhead are each provided with an arc opening; the two arc openings have the same shape and are connected; the arc opening includes a first straight edge, a first arc edge, a second straight edge and a second arc edge connected in sequence from bottom to top; the first straight edge is horizontally distributed, and the second straight edge is vertically distributed; the first arc edge is a quarter circle; the first arc edge is tangent to the first straight edge, and the first arc edge is tangent to the second straight edge; the second arc edge is tangent to the second straight edge; the distance from the first straight edge to the deck is H, H≤200mm. The structure of the present invention does not reduce the clear width of the lane while the fatigue life of the corner point where the two components intersect meets the requirements of ship specifications, which not only ensures the safety of the ship structure, but also helps to improve the roll-on / roll-off efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of ships, and in particular to an anti-fatigue structure at the connection between a transverse bulkhead and a longitudinal bulkhead of a cabin shed of a car roll-on / roll-off ship. Background Art

[0002] A car ro-ro ship is a ship specially designed for transporting cars, trucks and other vehicles. In order to facilitate the driving of vehicles in the cargo hold and improve the loading and unloading efficiency, a car ro-ro ship usually has a full-through deck structure, and the transverse strength is ensured by arranging transverse strong frames. The unique structural type of a car ro-ro ship makes it easy to produce large transverse deformation in a rolling state, so stress concentration is easy to occur at the sudden change of the transverse structure, which reduces the fatigue life.

[0003] Figure 1 and Figure 2 This is a structural diagram of the intersection of the horizontal and vertical bulkheads of the existing car ro-ro ship cabin shed. Figure 1 and Figure 2 As shown, the intersection corner 130 of the transverse bulkhead 110 and the longitudinal bulkhead 120 of the cabin canopy is located on the main deck 100, that is, the connection between the front end wall of the cabin canopy and the front end wall of the cabin. For car ro-ro ships, the front end wall of the cabin, the bow anti-collision bulkhead, the anti-rolling tank and other structures are arranged below the main deck, so the overall transverse stiffness of the structure below the main deck is greater than that of the structure above the main deck. The intersection corner of the transverse and longitudinal bulkheads of the cabin canopy is located on the main deck, that is, the so-called transverse structural stiffness change point. In addition, the structure is discontinuous, which will produce a large stress concentration in the rolling state, sometimes up to 800MPa, and there is a serious fatigue problem.

[0004] In order to solve the fatigue problem of the corners where the transverse and longitudinal bulkheads of car ro-ro ships intersect, there are three existing strengthening schemes:

[0005] Solution 1: Partially thicken the bulkhead at the connection;

[0006] Solution 2: Welding horizontally and vertically with brackets;

[0007] Solution 3: Partially thicken the bulkhead at the connection and weld transverse and longitudinal brackets.

[0008] When there is a large stress concentration at the intersection of the transverse and longitudinal bulkheads of a car ro-ro ship, especially for car ro-ro ships without half bulkheads, solution 1 often causes greater stress concentration and often fails to solve the problem; although solutions 2 and 3 can effectively reduce the stress concentration at the intersection of the transverse and longitudinal bulkheads by adding brackets less than 300mm, they will cause fatigue on the free edge of the bracket, resulting in failure of the reinforcement solution and failure to solve the problem. By increasing the size of the bracket, the fatigue life can be effectively improved, but the net width of the lane is also greatly reduced, reducing the ro-ro efficiency, which is unacceptable to shipowners. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide an anti-fatigue structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship.

[0010] The present invention solves the above technical problems through the following technical solutions:

[0011] The invention discloses an anti-fatigue structure at the connection between a transverse bulkhead and a longitudinal bulkhead of a cabin shed of a car ro-ro ship, comprising a transverse bulkhead and a longitudinal bulkhead connected to each other, wherein the transverse bulkhead and the longitudinal bulkhead are both fixed to a main deck; at the intersection of the transverse bulkhead and the longitudinal bulkhead, each of the transverse bulkhead and the longitudinal bulkhead is provided with an arc opening; the two arc openings have the same shape and are connected; the arc opening comprises a first straight edge, a first arc edge, a second straight edge and a second arc edge connected in sequence from bottom to top; the first straight edge is horizontally distributed, and the second straight edge is vertically distributed; the first arc edge is a quarter circle; the first arc edge is tangent to the first straight edge, and the first arc edge is tangent to the second straight edge; the second arc edge is tangent to the second straight edge; the distance from the first straight edge to the deck is H, and the value range of H is H≤200mm.

[0012] Preferably, the transverse bulkhead has a first local thickened area, the first local thickened area accommodates the arc-shaped opening of the transverse bulkhead, and the thickness of the first local thickened area is greater than the thickness of other parts of the transverse bulkhead.

[0013] Preferably, the longitudinal bulkhead has a second local thickened area, the second local thickened area accommodates the arc-shaped opening of the longitudinal bulkhead, and the thickness of the second local thickened area is greater than the thickness of other parts of the longitudinal bulkhead.

[0014] Preferably, the first straight line side of the arc-shaped opening of the transverse bulkhead intersects with the first straight line side of the arc-shaped opening of the longitudinal bulkhead.

[0015] Preferably, the height of the arc-shaped opening of the transverse bulkhead is the same as the height of the arc-shaped opening of the longitudinal bulkhead.

[0016] Preferably, the surface where the arc-shaped opening of the transverse bulkhead is located is perpendicular to the surface where the arc-shaped opening of the longitudinal bulkhead is located.

[0017] Preferably, the length of the first straight side is L1, and the value range of L1 is L1≤500 mm.

[0018] Preferably, the radius of the first arc edge is R1, and the value range of R1 is R1≤1250mm.

[0019] Preferably, the length of the second straight side is L2, and the value range of L2 is L2≤500mm.

[0020] Preferably, the radius of the second arc edge is R2, and the value range of R2 is R2≤1250mm.

[0021] The beneficial effects of the present invention are as follows: the anti-fatigue structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of the car roll-on / roll-off ship of the present invention can ensure that the fatigue life of the corner point where the transverse bulkhead and the longitudinal bulkhead intersect meets the requirements of ship specifications without reducing the net width of the lane and affecting the passage of vehicles, thereby ensuring the safety of the ship structure and helping to improve the roll-on / roll-off efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of the transverse bulkhead structure of the engine room shed of an existing car ro-ro ship.

[0023] Figure 2 for Figure 1 AA section diagram.

[0024] Figure 3 Schematic diagram of the structure of the transverse bulkhead of a preferred embodiment of the present invention.

[0025] Figure 4 for Figure 3 Schematic diagram of the BB cross-section.

[0026] Figure 5 It is a structural schematic diagram of the arc-shaped opening of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0027] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0028] like Figure 3 , Figure 4 and Figure 5 As shown, an anti-fatigue structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship comprises a transverse bulkhead 210 and a longitudinal bulkhead 220 connected to each other, and the transverse bulkhead 210 and the longitudinal bulkhead 220 are both fixed to the main deck 200.

[0029] At the intersection of the transverse bulkhead 210 and the longitudinal bulkhead 220, each of the transverse bulkhead 210 and the longitudinal bulkhead 220 is provided with an arc-shaped opening 230. The two arc-shaped openings have the same shape and are connected.

[0030] The arc-shaped opening 230 includes a first straight edge 231, a first arc edge 241, a second straight edge 232 and a second arc edge 242 connected in sequence from bottom to top; the first straight edge 231 is horizontally distributed, and the second straight edge 232 is vertically distributed; the first arc edge 241 is a quarter circle; the first arc edge 241 is tangent to the first straight edge 231, and the first arc edge 241 is tangent to the second straight edge 232; the second arc edge 242 is tangent to the second straight edge 232.

[0031] Preferably, the distance from the first straight edge 231 to the deck is H, and the value range of H is H≤200 mm.

[0032] Preferably, the length of the first straight edge 231 is L1, and the value range of L1 is L1≤500 mm.

[0033] Preferably, the radius of the first arc edge 241 is R1, and the value range of R1 is R1≤1250 mm.

[0034] Preferably, the length of the second straight edge 232 is L2, and the value range of L2 is L2≤500 mm.

[0035] Preferably, the radius of the second arc edge 242 is R2, and the value range of R2 is R2≤1250 mm.

[0036] The transverse bulkhead 210 has a first local thickened area 251, which accommodates the arc-shaped opening of the transverse bulkhead. The thickness of the first local thickened area is greater than the thickness of other parts of the transverse bulkhead.

[0037] The longitudinal bulkhead 220 has a second local thickened area 252, which accommodates the arc-shaped opening of the longitudinal bulkhead. The thickness of the second local thickened area is greater than the thickness of other parts of the longitudinal bulkhead.

[0038] The first straight line side of the arc-shaped opening of the transverse bulkhead 210 intersects with the first straight line side of the arc-shaped opening of the longitudinal bulkhead 220. The height of the arc-shaped opening of the transverse bulkhead is the same as the height of the arc-shaped opening of the longitudinal bulkhead. The surface where the arc-shaped opening of the transverse bulkhead is located is perpendicular to the surface where the arc-shaped opening of the longitudinal bulkhead is located.

[0039] The anti-fatigue structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of the car ro-ro ship of the present invention has the following characteristics:

[0040] 1. Arc-shaped openings are provided at the corners where the transverse bulkhead and longitudinal bulkhead of the engine room shed of the car ro-ro ship intersect.

[0041] 2. The type of arc opening is composed of arc, vertical line, arc and horizontal line from top to bottom. The height of the horizontal line from the deck is not more than 200mm.

[0042] 3. The transverse bulkheads and longitudinal bulkheads are locally thickened outside the arc-shaped opening areas at the intersection corners.

[0043] According to finite element calculation, the stress of the structure at the corner where the transverse bulkhead and the longitudinal bulkhead intersect is greatly reduced, the fatigue life is greatly improved, and the requirements of ship specifications are fully met.

[0044] The structure of the present invention adopts an arc-shaped opening mode and does not require additional components. Therefore, the net width of the lane will not be reduced, thereby ensuring the passage of vehicles.

[0045] The anti-fatigue structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of the car ro-ro ship of the present invention can ensure that the fatigue life of the corner point where the transverse bulkhead and the longitudinal bulkhead intersect meets the requirements of ship specifications without reducing the clear width of the lane and affecting the passage of vehicles, thereby ensuring the safety of the ship structure and helping to improve the ro-ro efficiency.

[0046] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An anti-fatigue structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship, comprising a transverse bulkhead and a longitudinal bulkhead connected to each other, wherein the transverse bulkhead and the longitudinal bulkhead are both fixed to the main deck; characterized in that: At the intersection of the transverse bulkhead and the longitudinal bulkhead, the transverse bulkhead and the longitudinal bulkhead are each provided with an arc-shaped opening; the two arc-shaped openings have the same shape and are connected; the arc-shaped opening comprises a first straight edge, a first arc edge, a second straight edge and a second arc edge which are sequentially connected from bottom to top; the first straight edge is horizontally distributed, and the second straight edge is vertically distributed; the first arc edge is a quarter circle; the first arc edge is tangent to the first straight edge, and the first arc edge is tangent to the second straight edge; the second arc edge is tangent to the second straight edge; the distance from the first straight edge to the deck is H, and the value range of H is H≤200mm; the transverse bulkhead has a first local thickening area, the first local thickening area accommodates the arc-shaped opening of the transverse bulkhead, and the thickness of the first local thickening area is greater than the thickness of other parts of the transverse bulkhead; the longitudinal bulkhead has a second local thickening area, the second local thickening area accommodates the arc-shaped opening of the longitudinal bulkhead, and the thickness of the second local thickening area is greater than the thickness of other parts of the longitudinal bulkhead.

2. The fatigue-resistant structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship according to claim 1, characterized in that: The first straight line side of the arc-shaped opening of the transverse bulkhead intersects with the first straight line side of the arc-shaped opening of the longitudinal bulkhead.

3. The fatigue-resistant structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship according to claim 1, characterized in that: The height of the curved openings in the transverse bulkheads is the same as that of the curved openings in the longitudinal bulkheads.

4. The anti-fatigue structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship according to claim 1, characterized in that: The plane where the curved opening of the transverse bulkhead is located is perpendicular to the plane where the curved opening of the longitudinal bulkhead is located.

5. The fatigue-resistant structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship according to claim 1, characterized in that: The length of the first straight line side is L1, and the value range of L1 is L1≤500mm.

6. The fatigue-resistant structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship according to claim 1, characterized in that: The radius of the first arc edge is R1, and the value range of R1 is R1≤1250mm.

7. The fatigue-resistant structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship according to claim 1, characterized in that: The length of the second straight line side is L2, and the value range of L2 is L2≤500mm.

8. The fatigue-resistant structure at the connection between the transverse bulkhead and the longitudinal bulkhead of the engine room shed of a car ro-ro ship as claimed in claim 1, characterized in that: The radius of the second arc edge is R2, and the value range of R2 is R2≤1250mm.

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