Large LNG stern section rib plate false bay device and construction method

Abstract

The invention relates to the technical field of ship construction processes, in particular to a large LNG stern section rib plate false bay device and a construction method. The device comprises a stern section and a false bay device arranged on the stern section, the false bay device is used for installing and positioning a hyperbolic-curve-shaped outer plate, the stern section comprises a deck, a longitudinal bone, an outer plate middle assembly and the hyperbolic-curve-shaped outer plate, and the hyperbolic-curve-shaped outer plate comprises scattered attaching outer plates and keel round steel located between the scattered attaching outer plates; the false bay device comprises a rib plate false bay and a platform false bay which are located at the hyperbolic-curve-shaped outer plate; and the scattered pasting outer plate is tightly attached to the false bay device to be repaired and cut so as to form a hyperbolic curve type outer plate, and after the keel round steel is installed, the false bay device is dismantled. Accurate installation references are provided for the hyperbolic-curve-type outer plate from different directions, the space change and inclination characteristics of the hyperbolic-curve-type outer plate are matched, the scattered pasting outer plate is made to be tightly attached, repaired and cut, the position is precisely restrained, the construction method steps are matched, and the installation precision and efficiency are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding technology, and in particular to a large-scale LNG ship stern segmented rib plate false bulkhead device and a construction method. Background Art

[0002] Given the large, linearly inclined structural characteristics of the twin-shaft stern of large LNG carriers, this area is typically divided into multiple, irregularly shaped stern sections during construction. These sections exhibit large, asymmetrical outer plating lines, a tilted structure, and require the processing of ribbed steel. For example, the method for constructing LNG carrier cargo hold side sections with beveled ribs, as disclosed in Chinese Patent Publication No. CN116968897A, suffers from numerous deficiencies in the positioning of the hyperbolic stern plating and ribbed steel. The positioning phase requires repeated data acquisition using a total station and manual trimming and positioning, a tedious and error-prone process. To ensure accurate rib installation, the curved plating requires multiple trimming operations to gradually approximate theoretical values. However, excessive trimming can severely impact the quality of critical structures. During large-scale assembly, the sections are in an inverted state, leaving little internal structure. The curved plating and ribbed steel require multiple positioning steps, making aerial work challenging and requiring complex tooling such as cutting torches, oil pumps, and plumb bobs. The above-mentioned repeated adjustment process significantly prolonged the segmented construction period and resulted in low efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a large-scale LNG ship stern segmented rib plate false bulkhead device and a construction method.

[0004] The technical solution adopted in the present invention is as follows: A large LNG ship stern section rib plate false bulkhead device comprises a stern section and a false bulkhead device provided on the stern section, the false bulkhead device being used for installation and positioning of a hyperbolic outer plate, wherein: The stern section includes the deck, longitudinals, center shell plating, and hyperbolic shell plating. The deck is equipped with longitudinals and longitudinal and transverse bulkheads between the longitudinals. The sides of the deck are equipped with near-center and far-center center shell plating assemblies. Hyperbolic shell plating is installed in the gaps along the center shell plating assemblies. The hyperbolic shell plating includes loose-fitting shell plating extending along the center shell plating assemblies and keel round steel bars located between the loose-fitting shell plating. False bulkheads include rib false bulkheads and platform false bulkheads located on the hyperbolic outer plating, where: Rib plate false bulkheads are set along the rib direction of the hyperbolic outer plate and have a fan-shaped cross section; The platform false bulkhead is set along the horizontal direction of the hyperbolic outer plate and has a triangular cross section; Among them, the loose outer plate is trimmed close to the false bulkhead device to form a hyperbolic outer plate. After the keel round steel is installed, the false bulkhead device is removed.

[0005] In the technical solution, the rib plate false bulkhead in the false bulkhead device is arranged in a fan shape along the rib direction, and the platform false bulkhead is arranged in a triangle along the horizontal direction, thereby providing installation reference for the double-curved outer plate from different directions; the fan-shaped rib plate false bulkhead fits the spatial variation along the rib direction, and the triangular platform false bulkhead adapts to the inclination characteristics along the horizontal direction, thereby accurately constraining the position of the double-curved outer plate; during installation, the scattered outer plate is closely cut against the false bulkhead device, the scattered outer plate is cut to a shape meeting the design requirements by means of the stable structure of the false bulkhead device, and the precision of the double-curved outer plate is ensured; after the round steel is installed, the false bulkhead device is removed, and the overall structural performance is not affected; by changing the shape and position of the false bulkhead, accurate reference is provided for the installation of the double-curved outer plate, the installation precision and efficiency are improved, and the construction quality of the stern section of the large LNG ship is ensured.

[0006] In addition, the false bulkhead device for the rib plate of the stern section of the large LNG ship according to the above-mentioned application has the following additional technical features: According to one embodiment of the application, the stern section is provided with 1-3 false bulkhead devices according to the size.

[0007] In the technical solution, the stern section has different sizes, and the overall structural strength and rigidity requirements also have differences. The large stern section has large size and heavy weight, and it is difficult to provide sufficient support and positioning precision for the double-curved outer plate during installation of the double-curved outer plate by only one false bulkhead device, and deformation or positioning deviation is prone to occur. By arranging multiple false bulkhead devices, the double-curved outer plate can be constrained from different positions, the stress is dispersed, the structural stability is enhanced, and the installation precision is ensured.

[0008] According to one embodiment of the application, the rib plate false bulkhead and the platform false bulkhead are both hollow cavities.

[0009] In the technical solution, the hollow structure can greatly reduce the weight of the false bulkhead device while ensuring that the false bulkhead device has sufficient strength to support and position the double-curved outer plate. The hollow structure reduces the amount of material used, reduces the manufacturing cost, and also facilitates disassembly later.

[0010] According to one embodiment of the application, the fan-shaped cross section of the rib plate false bulkhead includes the following boundaries: A round steel contact point, which cooperates with the round steel contact point; An outer plate contour I, which is an arc-shaped side and cooperates with the scattered outer plate on one side; An outer plate contour II, which is an arc-shaped side and cooperates with the scattered outer plate on the other side; A rib plate contour, which is an arc-shaped blocking side and is connected to the outer plate contour I and the outer plate contour II on both sides; The inner profile is arc-shaped and is arranged close to the inner wall of the rib plate profile to improve the strength of the false ceiling device.

[0011] In the technical solution, the round steel contact point is used for accurate positioning of the round steel of the longitudinal reinforcement and is not prone to displacement, effectively disperses the stress transmitted by the round steel, and avoids damage to the false ceiling caused by local stress concentration; the outer plate profile I and the outer plate profile II are arc-shaped side edges, which can better fit the shape of the scattered outer plate, so that the connection between the false ceiling and the outer plate is more closely and smoothly, and the gap is reduced; the rib plate profile connects the two side outer plate profiles as an arc-shaped stop edge, thereby enhancing the overall structural strength of the false ceiling; the inner profile is arc-shaped and close to the inner wall of the rib plate profile, so that the stress is uniformly transmitted and stress mutation is avoided, thereby effectively improving the strength of the false ceiling device.

[0012] According to one embodiment of the present application, the rib plate false ceiling is provided with a width W of ≥75 mm, an inner profile is provided with a circular arc R of ≥50 mm, and a thickness T of ≥12 mm; the profile of the rib plate false ceiling is provided with a negative tolerance N of -1 to -2 mm, which is used to facilitate the installation of the rib plate false ceiling.

[0013] In the technical solution, the width W of more than 75 mm is used to provide sufficient structural size for the false ceiling to withstand various loads during the installation and use of the stern section. The inner profile circular arc R of more than 50 mm is used to make the stress distribution more uniform; the thickness T of more than 12 mm is used to resist collision and extrusion during installation. The negative tolerance N of -1 to -2 mm makes the false ceiling smoothly embedded in the corresponding position during installation, reduces the installation difficulty caused by size deviation, and improves the assembly efficiency.

[0014] According to one embodiment of the present application, the triangular cross section of the platform false ceiling includes the following boundaries: The side profile I is arranged in a straight line and cooperates with one side of the scattered outer plate. The side profile II is arranged in a straight line and cooperates with the other side of the scattered outer plate. The platform profile is a straight stop edge, and the two sides thereof are connected with the side profile I and the side profile II, respectively.

[0015] According to one embodiment of the present application, the lower end of the longitudinal reinforcement round steel is connected with the round steel contact point of the rib plate false ceiling, and the upper end is connected with the tip of the platform false ceiling.

[0016] In the technical solution, the longitudinal reinforcement round steel can reinforce the tip of the platform false ceiling to prevent deformation or rupture caused by stress concentration; the longitudinal reinforcement round steel forms an organic whole with the longitudinal and transverse structures through this connection, and jointly bears various external forces during the navigation of the ship.

[0017] In order to achieve the above object, the application further provides a large LNG ship stern partial segment rib plate false bulkhead device and a construction method.

[0018] A large LNG ship stern partial segment rib plate false bulkhead device and a construction method, comprising the following steps: S1, installing an upper tire panel with the deck of the stern partial segment as a base surface; S2, installing longitudinal bones and internal longitudinal and transverse bulkheads with the deck of the stern partial segment as a base surface; S3, installing near and far middle outer plates on both sides of the stern partial segment, respectively; S4, installing rib plate false bulkheads and platform false bulkheads in the rib position direction and the horizontal direction, respectively; S5, installing scattered and attached outer plates with the rib plate false bulkheads and the platform false bulkheads as references, and cutting the scattered and attached outer plates; S6, installing positioning round steel dragon bones with the rib plate false bulkheads, the platform false bulkheads and the cut scattered and attached outer plates as references; S7, after the data of the round steel dragon bones meet the requirements, welding the stern partial segment, and monitoring the process; S8, after the welding of the stern partial segment is completed, re-measuring the data of the round steel dragon bone area, and removing the rib plate false bulkheads and the platform false bulkheads.

[0019] The technical scheme opens the construction process with the deck of the stern partial segment as a base surface, installs the upper tire panel first to lay the foundation structure, then installs the longitudinal bones and the internal longitudinal and transverse bulkheads to strengthen the internal support, then installs the outer plate middle assemblies on both sides to build the external contour, then installs the rib plate false bulkheads and the platform false bulkheads in the rib position and the horizontal direction as the key references for subsequent installation, installs the scattered and attached outer plates based on the two false bulkheads and cuts the scattered and attached outer plates to ensure the accuracy of the outer plates, installs the round steel dragon bones based on the false bulkheads and the cut outer plates as references, and uses the positioning to ensure the stability of the overall structure, welds after the data of the round steel dragon bones meet the requirements, monitors the process to ensure the welding quality and the structural stability, re-measures the data of the round steel dragon bone area after the welding of the stern partial segment is completed, removes the rib plate false bulkheads and the platform false bulkheads after confirming that there is no error, and completes the construction of the stern partial segment, so that the whole process is closely linked and gradually builds the stable and accurate large LNG ship stern partial segment structure.

[0020] According to one embodiment of the application, in the step S6, the round steel dragon bones are lifted to the rib plate false bulkheads, the platform false bulkheads and the cut scattered and attached outer plates by a hoisting machine, and the round steel dragon bones are arranged in close contact with the round steel contact points.

[0021] Compared with the prior art, the application has the following beneficial effects: (1) The false bulkhead device provides precise installation benchmarks for the hyperbolic outer plate from different directions, which conforms to the spatial changes and tilt characteristics of the hyperbolic outer plate, allowing the loose outer plate to be closely trimmed and accurately constrained. In conjunction with the construction method and steps, it effectively improves the installation accuracy and efficiency.

[0022] (2) The false bulkhead device disperses the force, the hollow structure reduces weight and ensures strength, and the keel round steel connects the longitudinal and transverse structures to jointly bear the external force, prevent deformation and cracking, and enhance the overall structural stability of the stern section. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is one of the structural schematic diagrams of the present invention.

[0024] Figure 2 This is the second structural diagram of the present invention.

[0025] Figure 3 It is a structural diagram of the ribbed false bulkhead.

[0026] Figure 4 It is a structural diagram of the platform's false bulkhead.

[0027] Figure 5 It is a flow principle block diagram of the present invention.

[0028] In the figure: 1. stern section; 11. deck; 12. longitudinal; 13. center shell plating assembly; 14. loose shell plating; 15. keel round steel; 2. false bulkhead; 21. round steel contact point; 22. shell plating profile I; 23. shell plating profile II; 24. rib profile; 25. internal profile; 3. platform false bulkhead. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1 like Figures 1 to 2 As shown, this embodiment provides a large LNG ship stern section 1 rib plate false bulkhead 2 device, including a stern section 1 and a false bulkhead device provided on the stern section 1, the false bulkhead device is used for installation and positioning of the hyperbolic outer plate, wherein: The stern section 1 includes a deck 11, longitudinal 12, outer plate middle group 13 and hyperbolic plate, the deck 11 is provided with longitudinal 12 and longitudinal transverse bulkhead between longitudinal 12; the side of the deck 11 is provided with the outer plate middle group 13 near the middle and the outer plate middle group 13 far from the middle; the hyperbolic plate is provided along the gap of the outer plate middle group 13, and the hyperbolic plate includes the loose plate 14 extending along the outer plate middle group 13, and the dragon muscle round steel 15 between the loose plate 14; The false bulkhead device includes the rib plate false bulkhead 2 at the hyperbolic plate and the platform false bulkhead 3, wherein: As shown in the drawings, Figure 3 The rib plate false bulkhead 2 is provided in the rib position direction of the hyperbolic plate, and the cross section is provided in a fan shape; As shown in the drawings, Figure 4 The platform false bulkhead 3 is provided in the horizontal direction of the hyperbolic plate, and the cross section is provided in a triangular shape; The loose plate 14 is cut close to the false bulkhead device to form the hyperbolic plate, and the false bulkhead device is removed after the dragon muscle round steel 15 is installed.

[0031] As shown in the drawings, Figures 1 to 4 In the technical solution, the rib plate false bulkhead 2 in the false bulkhead device is provided in a fan shape in the rib position direction, and the platform false bulkhead 3 is provided in a triangular shape in the horizontal direction, which provides installation reference for the hyperbolic plate from different directions; the fan-shaped rib plate false bulkhead 2 fits the space change in the rib position direction, and the triangular platform false bulkhead 3 adapts to the inclination characteristics in the horizontal direction, which can accurately constrain the position of the hyperbolic plate; during installation, the loose plate 14 is cut close to the false bulkhead device, and the stable structure of the false bulkhead device is used to cut the loose plate 14 to a shape meeting the design requirements, so as to ensure the precision of the hyperbolic plate; after the dragon muscle round steel 15 is installed, the false bulkhead device is removed, which does not affect the overall structural performance; by changing the shape and position of the false bulkhead, accurate reference is provided for the installation of the hyperbolic plate, the installation precision and efficiency are improved, and the construction quality of the large LNG ship stern section 1 is ensured.

[0032] In addition, according to the large LNG ship stern section 1 rib plate false bulkhead 2 device provided in the above-mentioned technical solution of the present application, the following additional technical features are further provided: According to one embodiment of the present application, the stern section 1 is provided with 1-3 false bulkhead devices according to the size.

[0033] In the technical solution, the stern section 1 has different sizes, and the overall structural strength and rigidity requirements also have differences. The large stern section 1 has large size and heavy weight, and it is difficult to provide sufficient support and positioning accuracy for the installation of the hyperbolic plate by only one false bulkhead device, and deformation or positioning deviation is prone to occur. By providing multiple false bulkhead devices, the hyperbolic plate can be constrained from different positions, the stress is dispersed, the structural stability is enhanced, and the installation accuracy is ensured.

[0034] According to one embodiment of the present application, the ribbed false bulkhead 2 and the platform false bulkhead 3 are both internally hollow cavities.

[0035] In the present technical solution, the hollow structure can greatly reduce the weight of the false bulkhead device while ensuring that the false bulkhead device has sufficient strength to support and position the hyperbolic outer plate. The hollow structure reduces the amount of material used, reduces manufacturing costs, and also facilitates disassembly later.

[0036] According to one embodiment of the present application, the fan-shaped cross-section of the ribbed false bulkhead 2 includes the following boundaries: The round steel contact point 21 is in the form of a concave arc, which cooperates with the round steel contact point 21; The outer plate contour I 22 is in the form of an arc-shaped side, which cooperates with the scattered outer plate 14 on one side; The outer plate contour II 23 is in the form of an arc-shaped side, which cooperates with the scattered outer plate 14 on the other side; The rib plate contour 24 is in the form of an arc-shaped side, which is connected to the outer plate contour I 22 and the outer plate contour II 23 on both sides; The internal contour 25 is in the form of an arc-shaped transition, which is arranged close to the inner wall of the rib plate contour 24 to improve the strength of the false bulkhead device.

[0037] In the present technical solution, the round steel contact point 21 is used for precise positioning of the round steel 15 and is not prone to displacement, effectively disperses the stress transmitted by the round steel, and avoids damage to the false bulkhead caused by local stress concentration; the outer plate contour I 22 and the outer plate contour II 23 are in the form of arc-shaped sides, which can better fit the shape of the scattered outer plate 14, making the connection between the false bulkhead and the outer plate more closely and smoothly, and reducing the gap; the rib plate contour 24 is connected to the outer plate contour on both sides as an arc-shaped side, enhancing the overall structural strength of the false bulkhead; the internal contour 25 is in the form of an arc-shaped transition and is close to the inner wall of the rib plate contour 24, uniformly transmitting stress and avoiding stress discontinuity, thereby effectively improving the strength of the false bulkhead device.

[0038] According to one embodiment of the present application, the ribbed false bulkhead 2 is provided with a width W of ≥75mm, the internal contour 25 is provided with a circular arc R of ≥50mm, and a thickness T of ≥12mm; the contour of the ribbed false bulkhead 2 is provided with a negative tolerance N of -1~-2mm, which is used to facilitate the installation of the ribbed false bulkhead 2.

[0039] In this technical solution, a width W of at least 75mm provides the dummy bulkhead with sufficient structural dimensions to withstand the various loads during installation and use of the stern section 1. The internal profile 25 arc R, at least 50mm long, ensures more uniform stress distribution; and a thickness T, at least 12mm, protects against collisions and crushing during installation. A negative tolerance N of -1 to -2mm ensures the dummy bulkhead fits smoothly into place during installation, reducing installation difficulties caused by dimensional deviations and improving assembly efficiency.

[0040] According to one embodiment of the present invention, the triangular cross-section of the platform false compartment 3 includes the following boundaries: The side profile I is arranged in a straight line and cooperates with the loose-fitting outer panel 14 on one side; The side profile II is arranged in a straight line and matches the loose-fitting outer panel 14 on the other side; The platform profile is a straight rib, and its two sides are connected to the side profile I and the side profile II respectively.

[0041] According to one embodiment of the present invention, the lower end of the rib round steel 15 is connected to the round steel contact point 21 of the rib false bulkhead 2 , and the upper end is connected to the tip of the platform false bulkhead 3 .

[0042] In this technical solution, the rib round steel 15 can reinforce the tip of the platform false bulkhead 3 to prevent deformation or rupture due to stress concentration; through this connection, the rib round steel 15 makes the longitudinal and transverse structures form an organic whole, jointly bearing various external forces received by the ship during navigation.

[0043] Example 2 Based on Example 1, Figure 5 As shown, this embodiment provides a large-scale LNG ship stern section 1 rib plate false bulkhead 2 device and a construction method, including the following steps: S1. Using the deck 11 of the stern section 1 as the base surface, install the upper tire panels; S2. Using the deck 11 of the stern section 1 as the base, install the longitudinals 12 and the internal longitudinal and transverse bulkheads; S3, install the near-center and far-center outer plate assemblies 13 on both sides of the stern section 1 respectively; S4. Install the rib plate false bulkhead 2 and the platform false bulkhead 3 in the rib direction and horizontal direction respectively; S5. Using the rib bulkhead 2 and the platform bulkhead 3 as reference, install the loose outer plates 14 respectively, and trim the loose outer plates 14 for the remaining space. S6. Using the ribbed bulkhead 2, platform bulkhead 3, and the trimmed and loosely attached outer plate 14 as a reference, install the positioning rib round steel 15; S7. After the data of the keel round steel 15 meets the requirements, the stern section 1 is assembled and welded, and the process is monitored; S8, after the stern section segment 1 is completed, the data of the round steel 15 is re-measured, and the false bulkhead 2 and the platform false bulkhead 3 are removed.

[0044] The technical scheme is characterized in that the deck 11 of the stern section segment 1 is used as a base surface to start the construction process, the upper part of the plate is installed first to lay the foundation structure, the longitudinal rib 12 and the internal longitudinal and transverse bulkhead are installed to strengthen the internal support, then the outer plate is installed on both sides to build the external contour, the false bulkhead 2 and the platform false bulkhead 3 are installed at the rib position and in the horizontal direction, which are used as the key reference for subsequent installation, the outer plate 14 is installed based on the two false bulkheads and the outer plate after trimming, and the outer plate accuracy is ensured, the round steel 15 is installed based on the false bulkheads and the outer plate after trimming, and the overall structure stability is ensured by positioning, the round steel 15 is installed, welded and monitored after the data of the round steel 15 meets the standard, the welding quality and the structure stability are ensured, finally, the round steel 15 is re-measured after the stern section segment 1 is completed, the false bulkhead 2 and the platform false bulkhead 3 are removed after the data is confirmed to be correct, the stern section segment 1 construction is completed, and the whole process is closely connected to gradually build the stable and accurate large LNG ship stern section segment 1 structure.

[0045] According to one embodiment of the present application, in the step S6, the round steel 15 is lifted by a lifting machine to the false bulkhead 2, the platform false bulkhead 3 and the outer plate 14 after trimming, and the round steel 15 is arranged close to the round steel contact point 21.

[0046] Although the present application is described in detail with reference to the preferred embodiments, the present application is not limited thereto. Various equivalent modifications or replacements can be made to the embodiments of the present application by those skilled in the art without departing from the spirit and essence of the present application, and these modifications or replacements should be included in the scope of the present application. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A large LNG ship stern section rib false bulkhead device, characterized in that: The invention comprises a stern section (1) and a false bulkhead device arranged on the stern section (1), wherein the false bulkhead device is used for installing and positioning a hyperbolic outer plate, wherein: The stern section (1) comprises a deck (11), longitudinals (12), a center shell assembly (13) and a hyperbolic shell plating. The deck (11) is provided with longitudinals (12) and longitudinal and transverse bulkheads located between the longitudinals (12). The sides of the deck (11) are provided with near-center and far-center center shell plating assemblies (13). Hyperbolic shell plating is provided along the gaps between the center shell plating assemblies (13). The hyperbolic shell plating comprises loose-attached shell plating (14) extending along the center shell plating assemblies (13) and rib round steel bars (15) located between the loose-attached shell plating (14). The false bulkhead device comprises a rib false bulkhead (2) and a platform false bulkhead (3) located at a hyperbolic outer plate, wherein: The rib plate false bulkhead (2) is arranged along the rib position direction of the hyperbolic outer plate, and has a fan-shaped cross section; The platform false bulkhead (3) is arranged along the horizontal direction of the hyperbolic outer plate and has a triangular cross section; Among them, the loose outer plate (14) is cut close to the false bulkhead device to form a hyperbolic outer plate, and after the installation of the dragon bar round steel (15) is completed, the false bulkhead device is removed.

2. The large-scale LNG ship stern segmented rib false bulkhead device according to claim 1, characterized in that: The stern section (1) is provided with 1-3 false bulkhead devices according to the size.

3. The large-scale LNG ship stern segmented rib false bulkhead device according to claim 1, characterized in that: The ribbed false compartment (2) and the platform false compartment (3) are both hollow cavities.

4. The large-scale LNG ship stern segmented rib false bulkhead device according to claim 1 or 3, characterized in that: The fan-shaped cross section of the ribbed false bulkhead (2) includes the following boundaries: The round steel contact point (21) is in a concave arc shape and matches the round steel contact point (21); The outer plate profile I (22) is an arc-shaped side, which matches the loose outer plate (14) on one side; The outer plate profile II (23) is a curved side, which matches the loose outer plate (14) on the other side; The rib profile (24) is an arc-shaped rib, and its two sides are connected to the outer plate profile I (22) and the outer plate profile II (23) respectively; The inner profile (25) is in an arc-shaped transition and is arranged close to the inner wall of the rib profile (24) to improve the strength of the false bulkhead device.

5. The large-scale LNG carrier stern segmented rib false bulkhead device according to claim 4, characterized in that: The ribbed false bulkhead (2) is provided with a width W of ≥75 mm, an internal profile (25) is provided with an arc R of ≥50 mm, and a thickness T of ≥12 mm; the profile of the ribbed false bulkhead (2) is provided with a negative tolerance N of -1 to -2 mm, so as to facilitate the installation of the ribbed false bulkhead (2).

6. The large-scale LNG ship stern segmented rib false bulkhead device according to claim 1 or 3, characterized in that: The triangular cross section of the platform false compartment (3) includes the following boundaries: The side profile I is arranged in a straight line and matches with the loose-fitting outer plate (14) on one side; The side profile II is arranged in a straight line and matches the loose-fitting outer plate (14) on the other side; The platform profile is a straight rib, and its two sides are connected to the side profile I and the side profile II respectively.

7. The large-scale LNG carrier stern segmented rib false bulkhead device according to claim 1, characterized in that: The lower end of the rib round steel (15) is connected to the round steel contact point (21) of the rib false bulkhead (2), and the upper end is connected to the tip of the platform false bulkhead (3).

8. A method for constructing a large-scale LNG ship stern section rib plate false bulkhead device, using the large-scale LNG ship stern section rib plate false bulkhead device according to any one of claims 1 to 7, characterized in that: The steps include: S1, using the deck (11) of the stern section (1) as the base surface, installing the upper tire panel; S2. Using the deck (11) of the stern section (1) as the base, install the longitudinals (12) and the internal longitudinal and transverse bulkheads; S3, installing the near-center and far-center outer plate assemblies (13) on both sides of the stern section (1); S4, installing the rib plate false bulkhead (2) and the platform false bulkhead (3) in the rib direction and the horizontal direction respectively; S5, using the rib false bulkhead (2) and the platform false bulkhead (3) as reference, respectively installing the loose outer plates (14), and trimming the loose outer plates (14); S6, using the ribbed bulkhead (2), the platform bulkhead (3) and the trimmed loose outer plate (14) as a reference, install the positioning rib round steel (15); S7. After the data of the rib round steel (15) meets the requirements, the stern section (1) is assembled and welded, and the process is monitored; S8. After the welding of the stern section (1) is completed, the data of the keel round steel (15) area is re-measured, and the rib false bulkhead (2) and the platform false bulkhead (3) are removed.

9. The method for constructing a large-scale LNG ship stern segmented rib false bulkhead device according to claim 8, characterized in that: In step S6, the rib round steel (15) is lifted by a hoist onto the rib false bulkhead (2), the platform false bulkhead (3) and the trimmed loose outer plate (14), and the rib round steel (15) is placed close to the round steel contact point (21).

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