Folding type swash bulkhead of large oil tanker

Abstract

A large oil tanker folding type swash bulkhead is characterized in that the folding type swash bulkhead is adopted in a liquid cargo tank, the folding type swash bulkhead is composed of a folding section in the middle and straight sections at the two ends, the cross section of the folding section is in a continuous triangle or semicircle shape, and a plurality of lightening holes are formed in a web of the folding section. The folding type swash bulkhead is connected with the longitudinal bulkhead and the cabin inner wall through straight sections, the straight section at one end of the folding type swash bulkhead is aligned with the transverse strong frame double-side rib plate, the straight section at the other end of the folding type swash bulkhead is aligned with the middle cargo cabin vertical truss, and the bottom of the folding type swash bulkhead is connected with the ship inner bottom or is spaced from the ship inner bottom. And when a gap exists between the folding type swash bulkhead and the inner bottom of the ship, the bottom of the folding type swash bulkhead is of a cut inclined structure. The number of components and the structural weight can be reduced to a great extent, meanwhile, the workload of assembling and welding is reduced, the folding type bulkhead is not provided with vertical reinforcing ribs, and cabin cleaning and rust prevention are facilitated.

Description

Technical Field

[0001] The invention belongs to the field of marine ship design and construction, and in particular relates to a foldable swash bulkhead of a large oil tanker. Background Art

[0002] In the field of ship design, a sloshing bulkhead is a perforated bulkhead designed in a liquid tank. The function of this structure is to improve the stability and safety of the ship's navigation by reducing the influence of the free liquid surface and the impact force on the watertight bulkhead caused by the sloshing of the liquid. Especially in the partial loading condition of the cargo tank (not empty or full), when the natural frequency of the liquid sloshing is close to the pitching frequency of the ship, the sloshing and pitching motion of the liquid resonate, which has a greater impact on the cargo tank.

[0003] In large oil tankers, the length of liquid cargo tanks is relatively long. Liquid tanks arranged longitudinally are generally equipped with anti-sloshing bulkheads in the tanks to change the sloshing frequency of the liquid in the tanks and reduce the damage to the bulkhead structure. Based on certain liquid dynamics, and taking into full consideration the movement characteristics of the ship and the layout of the hull structure, various forms of anti-sloshing bulkheads can be designed for ships.

[0004] Traditional large oil tanker sloshing bulkheads are made of flat transverse bulkheads welded with vertical stiffeners to form a flat plate frame structure. In order to effectively prevent the bulkhead from buckling, a certain amount of horizontal buckling ribs need to be set to form a plate grid structure. Several lightening holes and water holes are opened on the plate grid to resist the impact of liquid sloshing in the tank on the bulkhead.

[0005] Traditional designs have disadvantages such as small opening area, large number of structural components, heavy structure weight, and large assembly and welding volume. This patent aims to optimize the hull structure to improve ship performance and economy. Under the premise of ensuring structural strength and stability, by improving the structural design of the hull and reducing the number of components, the empty ship weight is reduced, saving shipbuilding costs. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a foldable swash bulkhead for a large oil tanker, the technical solution adopted by the present invention is: A foldable sway bulkhead of a large oil tanker is used in a liquid cargo tank. The foldable sway bulkhead consists of a foldable section in the middle and straight sections at both ends. The cross section of the foldable section is a continuous triangle or semicircle. A plurality of lightening holes are opened on the web of the foldable section. The angle of the triangle is 60° to 120°.

[0007] The foldable sweep bulkhead is connected to the longitudinal bulkhead and the inner bulkhead through a straight section. The straight section at one end of the foldable sweep bulkhead is aligned with the transverse strong frame double side ribs, and the straight section at the other end is aligned with the vertical girder of the middle cargo hold. The bottom of the foldable sweep bulkhead is connected to the inner bottom of the ship, or there is a gap between the inner bottom of the ship. The gap between the sweep bulkhead and the inner bottom of the ship can facilitate the discharge of residual oil to a greater extent, and can support the passage of larger mechanical equipment, thereby improving the mechanization degree of construction in the cabin.

[0008] When the bottom of the foldable swash bulkhead is connected to the inner bottom of the ship, oil and water holes and door holes are arranged on the web of the foldable section, and the oil and water holes are floor-standing waist-round holes or floor-standing elliptical holes.

[0009] When there is a distance between the foldable wash bulkhead and the inner bottom of the ship, the bottom of the foldable wash bulkhead is a beveled structure with a bevel angle of 20° to 60°.

[0010] The above-mentioned foldable swash bulkhead of a large oil tanker, further, has a width of the straight section of 600mm to 1000mm.

[0011] The above-mentioned foldable swash bulkhead of a large oil tanker further has a width of the ground-standing waist circular hole or the ground-standing elliptical hole that does not exceed 70% of the width of the web at the triangular folding section.

[0012] The above-mentioned foldable swash bulkhead of a large oil tanker further has a size of the lightening hole of 1200*600mm.

[0013] The above-mentioned foldable sway bulkhead of a large oil tanker further has a manhole provided on the foldable section web at a distance of 600 mm from the top horizontal girder.

[0014] The above-mentioned foldable sway bulkhead of a large oil tanker further has a manhole size of 900*700mm.

[0015] The above-mentioned foldable sway bulkhead of a large oil tanker further has a door hole with a height of 1900 mm and a width of 900 mm.

[0016] The above-mentioned foldable swash bulkhead of a large oil tanker further has a vertical lightening area of ​​the lightening holes, door holes and manholes that is no more than 50%.

[0017] The above-mentioned foldable sway bulkhead of a large oil tanker further has an end soft toe at the junction of the horizontal girder and the longitudinal bulkhead, the width of the end soft toe is not less than 500mm and not more than 2000mm, and the semicircular radius is 1000mm.

[0018] The beneficial effects of the present invention are: 1.Compared with the plane bulkhead, the foldable bulkhead does not use vertical reinforcement ribs. Its advantage is that under the same strength conditions, the number of components can be reduced, the weight of the structure can be reduced, and steel can be saved.

[0019] 2. Compared with the traditional flat sway bulkhead, this patent eliminates the stiffener and its connecting bracket, and removes the horizontal girder B structure between the inner shell and the longitudinal bulkhead. This design can greatly reduce the number of components and structural weight, while reducing the workload of assembly and welding.

[0020] 3. The foldable bulkhead has no vertical reinforcement ribs, which is more conducive to cabin cleaning and rust prevention.

[0021] 4. The foldable bulkhead can be designed with wider manholes and larger oil and water holes, which is more conducive to the passage of personnel and reduces the accumulation of oil and water.

[0022] 5. The large opening design at the lower end of the foldable bulkhead can greatly reduce the weight of the plate, making construction and passage easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the front view of the structure of the connection between the foldable wash bulkhead and the inner bottom of the ship; Figure 2 yes Figure 1 Side section structural diagram; Figure 3 It is a schematic diagram of the front view structure in which there is a gap between the foldable wash bulkhead and the inner bottom of the ship; Figure 4 yes Figure 3 Side section structural diagram; Figure 5 It is a schematic cross-sectional structure diagram of a foldable type sweep bulkhead having a triangular folding section; Figure 6 It is a schematic cross-sectional structure diagram of a foldable type sweep bulkhead having a semicircular folding section; Among them, 1-foldable swash bulkhead, 2-straight section, 3-folded section, 4-lightening hole, 5-oil and water hole, 6-door hole, 7-manhole, 8-vertical girder, 9-horizontal girder, 10-double side rib, 11-inner bottom plate, 12-end soft toe, 13-inner shell, 14-longitudinal bulkhead, 15-large opening. DETAILED DESCRIPTION

[0024] The present invention will be further described in conjunction with the accompanying drawings.

[0025] A foldable swash bulkhead for a large oil tanker, such as Figure 1 , 2As shown in the figure, a foldable sweep bulkhead is used in the liquid cargo tank. The foldable sweep bulkhead consists of a foldable section in the middle and straight sections at both ends. The cross section of the foldable section is a continuous triangle or semicircle. A plurality of lightening holes are provided on the web of the foldable section. The foldable sweep bulkhead is connected to the longitudinal bulkhead and the inner tank wall through a straight section. The straight section at one end of the foldable sweep bulkhead is aligned with the double side ribs of the transverse stiffener frame, and the straight section at the other end is aligned with the vertical girder of the middle cargo hold. The bottom of the foldable sweep bulkhead is connected to the inner bottom of the ship, or there is a gap between the bottom and the inner bottom of the ship.

[0026] The top of the foldable swash bulkhead is connected to the horizontal girder, and the bottom is connected to the inner bottom of the ship. Oil and water holes and door holes are arranged on the bottom web of the foldable section. The oil and water holes are floor-standing waist-round holes or floor-standing elliptical holes.

[0027] like Figure 5 As shown in the figure, the cross-section of the foldable anti-sway bulkhead is triangular. The foldable anti-sway bulkhead only relies on the bending of the plate to provide sufficient strength support. The bending angle of the triangle is consistent, ranging from 60° to 120°, and the bending depth is between 0.5 times the rib spacing and 2 times the rib spacing. According to the actual width between the inner shell and the longitudinal bulkhead, as well as the bending angle and bending depth, the bulkhead plate is folded into multiple angles. According to the actual factory processing capacity, plate width, etc., the acceptable number of folds for each plate is 1-3 times, so the entire bulkhead plate needs to be divided into multiple plates for bending processing and then welded and spliced. Due to strength calculation reasons, the bulkhead plate will be set with different thicknesses in the vertical height. If necessary, a transverse plate seam needs to be set to divide the plate into two upper and lower parts.

[0028] The bending depth of the triangular folding section of the foldable sweep bulkhead is 1100mm, the bending angle is 104°, the actual width between the inner shell and the longitudinal bulkhead is 15280mm, the sweep bulkhead plate is folded into 11 angles, and a total of 1 transverse plate seam and 5 vertical plate seams are set to divide the bulkhead into 11 plates.

[0029] A door hole is set after the first bend near the longitudinal bulkhead. The door hole is a floor-standing type, with a size of 1800*900 square holes and semicircular transitions at the four corners. The remaining straight sections are all provided with oil and water holes at the bottom. 3-5 waist-round lightening holes are set along the height direction, and the size of each lightening hole is 1200*600mm. A 900*700mm manhole is set at a distance of 600mm downward from the horizontal beam for easy use during the construction process. Considering the thickness requirements of the upper and lower plates, it is divided into two pieces along the height direction. In the actual processing process, the transverse plate seams are first spliced, and the overall bending process is performed after the upper and lower plates are spliced.

[0030] like Figure 3 , 4As shown in the figure, the space between the lower end of the foldable sweep bulkhead and the inner bottom can be left empty, a large opening can be set, and the bottom can be raised to a certain height, between 1500mm and 3500mm, i.e., the large opening height. From this height, the foldable bulkhead can be beveled, and the bevel angle can be between 20° and 60°. This large opening solution can also be applied to the sweep bulkhead with a semicircular folding section, and its design principle is the same as that of the triangular sweep bulkhead.

[0031] like Figure 6 As shown in the figure, the cross section of the folding type swing bulkhead is semicircular. The semicircular swing bulkhead is formed by rolling and welding. The rolling radius is determined by the actual width between the inner shell and the longitudinal bulkhead, as well as the rolling depth. The rolling depth is between 0.5 times the rib spacing and 2 times the rib spacing. The flat plate is rolled into multiple semicircles or inferior arcs. According to the actual factory processing capacity, plate width, etc., the acceptable number of rolling times for each plate is 1-3. Therefore, the entire bulkhead plate needs to be divided into multiple plates for rolling processing and then welded and spliced.

[0032] The semicircular swing bulkhead has an actual width of 15280mm between the inner shell and the longitudinal bulkhead, a rolling depth of 1100mm, a rolling radius of 980mm, 1 transverse plate seam and 4 vertical plate seams. The bulkhead is divided into 9 plates with a total of 9 bends.

Claims

1. A foldable swash bulkhead for a large oil tanker, characterized in that: A foldable sweep bulkhead is used in the cargo tank. The foldable sweep bulkhead consists of a folded section in the middle and straight sections at both ends. The cross section of the folded section is a continuous triangle or semicircle. There are multiple lightening holes on the web of the folded section. The angle of the triangle is 60° to 120°. The foldable wash bulkhead is connected to the longitudinal bulkhead and the inner bulkhead through a straight section. The straight section at one end of the foldable wash bulkhead is aligned with the transverse double side ribs of the stiffening frame, and the straight section at the other end is aligned with the vertical girder of the middle cargo hold. The bottom of the foldable wash bulkhead is connected to the inner bottom of the ship, or there is a gap between the bottom and the inner bottom of the ship. When the top of the foldable swash bulkhead is connected to the horizontal girder and the bottom is connected to the inner bottom of the ship, oil and water holes and door holes are provided on the web of the foldable section. The oil and water holes are floor-standing waist-shaped holes or floor-standing elliptical holes. When there is a distance between the foldable wash bulkhead and the inner bottom of the ship, the bottom of the foldable wash bulkhead is a beveled structure with a bevel angle of 20° to 60°.

2. A foldable sweep bulkhead for a large oil tanker according to claim 1, characterized in that: The width of the straight section is 600mm to 1000mm.

3. A foldable sweep bulkhead for a large oil tanker according to claim 1, characterized in that: The width of the ground-mounted waist circular hole or ground-mounted elliptical hole shall not exceed 70% of the width of the web at the triangular folding section.

4. A foldable sweep bulkhead for a large oil tanker according to claim 1, characterized in that: The size of the lightening hole is 1200*600mm.

5. A foldable sweep bulkhead for a large oil tanker according to claim 1, characterized in that: A manhole is provided on the folded section web 600mm away from the top horizontal girder.

6. A foldable sweep bulkhead for a large oil tanker according to claim 5, characterized in that: The manhole size is 900*700mm.

7. A foldable sweep bulkhead for a large oil tanker according to claim 1, characterized in that: The door opening is 1900mm high and 900mm wide.

8. A foldable sweep bulkhead for a large oil tanker according to claim 5, characterized in that: The vertical reduction area of ​​the lightening holes, door holes and manholes shall not exceed 50%.

9. A foldable sweep bulkhead for a large oil tanker according to claim 1, characterized in that: A soft toe is to be provided at the junction of the horizontal girder and the longitudinal bulkhead. The width of the soft toe shall not be less than 500mm and not more than 2000mm, and the semicircular radius shall be 1000mm.

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