Multistage connecting structure of submersible vehicle bulkhead main framework endpoint and pressure-resistant shell

Abstract

The invention discloses a multistage connecting structure for an endpoint of a bulkhead main framework and a pressure-resistant shell of a submersible vehicle. The multistage connecting structure comprises a flitch, a T-shaped longitudinal bone, the bulkhead main framework and an arc toggle plate, the flitch is mounted on the surface of the pressure-resistant shell; the T-shaped longitudinal bone comprises a T-shaped longitudinal bone web plate and a T-shaped longitudinal bone panel, the T-shaped longitudinal bone web plate is connected with the flitch, and the end parts of the T-shaped longitudinal bone web plate and the T-shaped longitudinal bone panel are connected with the plane bulkhead; the bulkhead main framework comprises a bulkhead main framework web plate and a bulkhead main framework panel, and the end parts of the bulkhead main framework web plate and the bulkhead main framework panel are connected with the T-shaped longitudinal framework panel; and the arc toggle plate is connected with the T-shaped longitudinal panel and the bulkhead main framework panel. Through multi-stage connection of the T-shaped longitudinal bone, the flitch, the arc toggle plate, the arc toggle plate panel and the like, the structural stress is reduced stage by stage, the problem of local stress concentration of the pressure-resistant shell is finally solved, the stress of each structure is relatively uniform, the problem of local stress concentration is obviously improved, and deformation among the structures is more coordinated.

Description

Technical Field

[0001] The present invention relates to the field of hull structure design, and in particular to a connection structure between an end point of a main frame of a submersible bulkhead and a shell. Background Art

[0002] Submarines, submersibles, deep-sea space stations, etc. are subjected to a certain amount of deep-water pressure underwater. In order to facilitate both force bearing and internal layout, the pressure hull is generally designed as a cylindrical shell structure, and the end bulkheads and internal bulkheads are designed as flat bulkhead structures. The connection structure between the end points of the traditional flat bulkhead main frame and the pressure hull is shown in the attached figure. Figure 1 One method is to use triangular brackets to strengthen the ends of the main frame, as shown in the attached Figure 1 (a) The connection between the bracket and the main frame effectively reduces the shear stress at the end of the frame; one method is to use brackets to strengthen the end of the main frame, such as the attached Figure 1 (b) effectively reduces the shear stress at the ends of the frame. However, at the M and N points where the bracket panels, main frame panels and pressure hull are connected (or the P point where the main frame panels are connected to the pressure hull), a large stress concentration will be formed on the pressure hull. For various cylindrical submersibles, as the diving depth increases, the stress concentration problem at the connection between the bulkhead main frame endpoint and the pressure hull is very obvious. Under extreme pressure, the stress on the inner surface of the pressure hull far exceeds the yield limit of the material. There are certain safety risks in long-term use under extreme pressure. To resolve this stress concentration problem, traditional designs need to significantly increase the size of the bracket (the width and height of the bracket need to be increased by 2-3 times. Taking a large submersible as an example, the size of the triangular bracket is about 2m×2m, and the projected area is about 2m 2 , 10 groups of structures need to be set up in the circumferential direction). For a submersible with limited internal space, this brings great difficulties to the overall design and is unacceptable in terms of layout. Summary of the Invention

[0003] In response to the problems existing in the above-mentioned prior art, the present invention proposes a multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull. The structure is connected by multiple stages such as T-shaped longitudinal bones, plates, arc elbow plates, and arc elbow plate panels, which gradually reduces the structural stress and ultimately resolves the problem of local stress concentration in the pressure hull. At the same time, the structure is easy to construct and has good environmental adaptability.

[0004] The technical solution adopted in the present invention is: A kind of submersible cabin bulkhead main frame end point and pressure hull multistage connection structure, including patch, T-type longitudinal bone, cabin bulkhead main frame and circular arc knee plate;The patch is installed on the surface of pressure hull;The T-type longitudinal bone includes T-type longitudinal bone web and T-type longitudinal bone panel, the T-type longitudinal bone web is connected with the patch, and the end of T-type longitudinal bone web and T-type longitudinal bone panel is connected with plane cabin bulkhead;The cabin bulkhead main frame includes cabin bulkhead main frame web and cabin bulkhead main frame panel, and the end of cabin bulkhead main frame web and cabin bulkhead main frame panel is connected with the T-type longitudinal bone panel;The circular arc knee plate is connected with the T-type longitudinal bone panel and cabin bulkhead main frame panel.

[0005] In the above scheme, the T-type longitudinal bone further includes T-type longitudinal bone knee plate located on both sides of the T-type longitudinal bone web, and the T-type longitudinal bone knee plate is connected with the T-type longitudinal bone web and the T-type longitudinal bone panel to form an integral structure.

[0006] In the above scheme, the T-type longitudinal bone knee plate is provided with 3-4 groups along the length direction of the T-type longitudinal bone.

[0007] In the above scheme, the circular arc knee plate edge is provided with a circular arc knee plate panel.

[0008] In the above scheme, the patch is 200-300 mm away from the cabin bulkhead panel, a plurality of plug welding holes are formed on the patch, and after the pressure hull is completed, the patch is tightly fitted with the pressure hull to be in place, the patch is welded with the pressure hull in the form of fillet weld around, and the patch is connected with the pressure hull by plug welding through the plug welding holes.

[0009] In the above scheme, the plug welding hole position does not coincide with the position of the T-type longitudinal bone web and the T-type longitudinal bone knee plate, and the distance is not less than 50 mm.

[0010] In the above scheme, the thickness of the patch is 0.8-1.0 times the thickness of the pressure hull, the width is 2.5-3.5 times the width of the T-type longitudinal bone panel, and the longitudinal length exceeds the T-type longitudinal bone web by 300-400 mm; the patch material is high-strength steel used for pressure hull.

[0011] In the above scheme, the height of the T-type longitudinal bone web is 200-300 mm, and the thickness is 1.0-1.2 times the thickness of the cabin bulkhead main frame web; the width of the T-type longitudinal bone panel is equal to the width of the cabin bulkhead main frame panel, and the thickness is 0.9-1.1 times the thickness of the cabin bulkhead main frame panel; the total length of the T-type longitudinal bone is 2.5-3.5 times the height of the cabin bulkhead main frame.

[0012] In the above scheme, the thickness of the circular arc knee plate is 0.7-1.0 times the thickness of the cabin bulkhead main frame web, the maximum profile width and height are equal, which is 1.2-1.8 times the height of the cabin bulkhead main frame, and the circular arc radius is 300-400 mm; the thickness of the circular arc knee plate panel is equal to the thickness of the circular arc knee plate, and the width of the circular arc knee plate panel is 80-100 mm.

[0013] Correspondingly, the application also provides a preparation method of the multi-stage connection structure of the end point of the hull bulkhead main frame and the pressure hull, comprising the following steps: A patch section is arranged at the area close to the T-shaped longitudinal rib of the hull bulkhead main frame web plate and the hull bulkhead main frame panel, the patch section is not installed in the field, and the other parts of the hull bulkhead main frame web plate and the hull bulkhead main frame panel are welded with the flat bulkhead in the field; The T-shaped longitudinal rib web plate, the T-shaped longitudinal rib panel and the T-shaped longitudinal rib elbow plate are welded to form an integral T-shaped longitudinal rib component in the field; The circular arc elbow plate and the circular arc elbow plate panel are welded to form an integral component in the field; After the pressure hull is completed, the patch is tightly assembled with the pressure hull, the patch is welded with the pressure hull in the form of fillet weld around the patch, and the patch is connected with the pressure hull through plug welding; After the flat bulkhead and the pressure hull are assembled and constructed, the integral T-shaped longitudinal rib component is assembled in place and welded with the flat bulkhead, the pressure hull and the patch respectively; Then, the patch section arranged on the hull bulkhead main frame web plate and the hull bulkhead main frame panel is installed in place and welded; Finally, the circular arc elbow plate is assembled and welded with the hull bulkhead main frame panel and the T-shaped longitudinal rib panel.

[0014] The application has the following beneficial effects: Compared with the traditional design, the multi-stage connection structure of the end point of the hull bulkhead main frame and the pressure hull designed by the application reduces the structural stress step by step through the multi-stage connection of the T-shaped longitudinal rib, the patch, the circular arc elbow plate and the circular arc elbow plate panel, and finally resolves the local stress concentration problem of the pressure hull, so that the stress of each structure is relatively uniform, the local stress concentration problem is obviously improved, and the deformation between the frames is more coordinated. Calculation shows that under the same structure of the pressure hull, the flat bulkhead and the hull bulkhead main frame and under the same external pressure, the maximum stress of the inner surface of the pressure hull is reduced by about 45%, and the maximum Von Mise stress of each end point of the hull bulkhead main frame is reduced by 40%.

[0015] The structure composed of the T-shaped longitudinal rib, the circular arc elbow plate and the hull bulkhead main frame of the application is relatively long in the ship longitudinal direction, which effectively reduces the shear stress of the end point of the hull bulkhead main frame.

[0016] In the multi-stage connection structure of the application, the patch, the T-shaped longitudinal rib, the circular arc elbow plate and the circular arc elbow plate panel are relatively small, which is convenient for construction and replacement. If the submarine often reaches the design limit depth during service, local fatigue problems of the structure are caused, and the replacement is convenient during repair. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0018] Figure 1 is a structural schematic diagram of the connection between the end point of the traditional flat bulkhead main frame and the pressure hull, wherein (a) is a schematic diagram of the end point of the main frame using a triangular knee plate for reinforcement, and (b) is a schematic diagram of the end point of the main frame with a high-stiffened web plate; Figure 2 is a schematic diagram of the multi-stage connection structure between the end point of the main frame of the submarine bulkhead and the pressure hull of the present application; Figure 3 is Figure 2 the A-A direction sectional view of; Figure 4 is a schematic diagram of the patch plug hole; Figure 5 is a structural schematic diagram of the flat bulkhead in the embodiment of the present application; Figure 6 is a Von Mise stress cloud chart of the T-shaped longitudinal web plate and the circular arc knee plate in the embodiment of the present application; Figure 7 is a normal stress cloud chart of the T-shaped longitudinal web plate and the circular arc knee plate in the embodiment of the present application; Figure 8 is a longitudinal stress cloud chart of the inner surface of the rib root of the pressure hull in the embodiment of the present application; Figure 9 is a circumferential stress cloud chart of the inner surface of the rib root of the pressure hull in the embodiment of the present application; Figure 10 is a Von Mise stress cloud chart of the inner surface of the pressure hull in the embodiment of the present application.

[0019] In the figure: 1, pressure hull; 2, flat bulkhead; 3, patch; 31, plug hole; 4, T-shaped longitudinal rib; 41, T-shaped longitudinal web plate; 42, T-shaped longitudinal plate; 43, T-shaped longitudinal knee plate; 5, circular arc knee plate; 51, circular arc knee plate; 6, bulkhead main frame; 61, bulkhead main frame web plate; 62, bulkhead main frame plate. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that the illustrations provided in the embodiments of the present invention are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0022] In the present invention, it should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like are used to indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present application and to simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present application. Furthermore, the terms "first" and "second" are used solely for descriptive and distinguishing purposes and should not be construed as indicating or implying relative importance.

[0023] like Figures 2-3 The figure shows a multi-stage connection structure between the endpoints of a submersible bulkhead main structure and the pressure hull, as proposed in an embodiment of the present invention. The structure comprises a plate 3, a T-shaped longitudinal 4, a bulkhead main structure 6, and an arc bracket 5. The plate 3 is mounted on the surface of the pressure hull 1. The T-shaped longitudinal 4 comprises a T-shaped longitudinal web 41, a T-shaped longitudinal face plate 42, and T-shaped longitudinal brackets 43 located on either side of the T-shaped longitudinal web 41. The T-shaped longitudinal web 41 is connected to the plate 3, and the ends of the T-shaped longitudinal web 41 and the T-shaped longitudinal face plate 42 are connected to the planar bulkhead 2. The bulkhead main structure 6 comprises a bulkhead main structure web 61 and a bulkhead main structure face plate 62. The ends of the bulkhead main structure web 61 and the bulkhead main structure face plate 62 are connected to the T-shaped longitudinal face plate 42. The arc bracket 5 is connected to the T-shaped longitudinal face plate 42 and the bulkhead main structure face plate 62. The arc bracket 5 is provided with an arc bracket face plate 51.

[0024] The multi-stage connection structure of the end point of the main frame of the hull bulkhead and the pressure hull is provided by the application, the main frame of the hull bulkhead 6 is not directly connected to the pressure hull 1, but is connected to the T-shaped longitudinal rib 4, and the stress of the main frame of the hull bulkhead 6 caused by the pressure borne by the pressure hull 1 and the pressure borne by the plane bulkhead 2 is first transmitted to the T-shaped longitudinal rib 4, and the originally concentrated stress is transmitted to the patch plate 3 through the T-shaped longitudinal rib web plate 41 and the T-shaped longitudinal rib elbow plate 43, and the stress of each point on the patch plate 3 is significantly reduced due to the substantial increase of the stress area. The patch plate 3 is equivalent to the local thickening treatment of the pressure hull 1, and even under the design limit depth, the stress of the inner surface of the patch plate 3 reaches a high value, and the stress of the inner surface of the pressure hull 1 is substantially reduced, thereby effectively protecting the pressure hull 1. The circular arc elbow plate 5 can effectively reduce the concentrated stress generated by the connection of the main frame panel 62 of the hull bulkhead, the main frame web plate 61 of the hull bulkhead and the T-shaped longitudinal rib 4, and the circular arc elbow plate panel 51 solves the stress concentration problem of the circular arc elbow plate 5 in the circular arc transition area. In summary, the multi-stage connection structure of the end point of the main frame of the hull bulkhead and the pressure hull designed by the application has relatively uniform stress of each structure, and the local stress concentration problem is obviously improved, and the deformation between the structures is more coordinated.

[0025] In addition, the structure composed of the T-shaped longitudinal rib 4, the circular arc elbow plate 5 and the main frame of the hull bulkhead 6, the T-shaped longitudinal rib and the circular arc elbow plate are relatively long along the longitudinal direction of the ship, thereby effectively reducing the shear stress of the end point of the main frame of the hull bulkhead. The T-shaped longitudinal rib is arranged close to the pressure hull, and compared with the triangular elbow plate reinforcement structure which meets the stress requirement, the size of the T-shaped longitudinal rib and the circular arc elbow plate is substantially reduced, thereby meeting the cabin arrangement requirement (for example, the projected area of the T-shaped longitudinal rib and the circular arc elbow plate is about 0.74 m 2 , which is only 37% of the traditional triangular elbow plate scheme.) As shown in Figure 4 , a plurality of plug welding holes 31 are formed in the patch plate 3, and after the pressure hull 1 is completed, the patch plate 3 is tightly fitted to the position of the pressure hull 1, the patch plate 3 is welded to the pressure hull 1 in the form of an angle weld seam around the patch plate 3, and the patch plate 3 is connected to the pressure hull 1 through plug welding. It should be noted that the position of the plug welding hole 31 does not coincide with the position of the T-shaped longitudinal rib web plate 41 and the T-shaped longitudinal rib elbow plate 43, and the distance is not less than 50 mm. The plug welding form makes the connection points of the patch plate 3 and the pressure hull 1 more, and the stress uniformity is better.

[0026] Since the welding seam requirement of the plane bulkhead 2 and the pressure hull 1 is higher than that of the patch plate 3 and the pressure hull 1, and considering that the patch plate 3 is welded to the pressure hull 1 first and there is a certain position deviation in the installation of the patch plate 3 and the installation of the plane bulkhead 2, in order to ensure the installation, welding quality and welding seam size, a certain distance is left between the patch plate 3 and the plane bulkhead 2, and the distance is 200-300 mm. Therefore, the T-shaped longitudinal rib web plate 41 needs to be connected to the pressure hull 1 in this area.

[0027] Further optimization, the thickness of the plate 3 is 0.8-1.0 times of the thickness of the pressure shell 1, the width is 2.5-3.5 times of the width of the T-shaped longitudinal rib panel 42, and the longitudinal length exceeds 300-400mm of the T-shaped longitudinal rib web 300-400mm. The material adopts high-strength steel used for the pressure shell 1.

[0028] Further optimization, the T-shaped longitudinal rib elbow plate 43 is arranged in 3-4 groups along the length direction of the T-shaped longitudinal rib 4, and the T-shaped longitudinal rib elbow plate 43 is connected with the T-shaped longitudinal rib web 41 and the T-shaped longitudinal rib panel 42 to form an integral T-shaped longitudinal rib 4 component. The height of the T-shaped longitudinal rib web 41 is 200-300mm, and the thickness is 1.0-1.2 times of the thickness of the bulkhead main frame web 61. The width of the T-shaped longitudinal rib panel 42 is equal to the width of the bulkhead main frame panel 62, and the thickness is 0.9-1.1 times of the thickness of the bulkhead main frame panel 62. The total length of the T-shaped longitudinal rib 4 is 2.5-3.5 times of the height of the bulkhead main frame 6.

[0029] Further optimization, the thickness of the circular arc elbow plate 5 is 0.7-1.0 times of the thickness of the bulkhead main frame web 61, the maximum profile width and height are equal, and the height is 1.2-1.8 times of the height of the bulkhead main frame 6. The circular arc radius is 300-400mm. The thickness of the circular arc elbow plate panel 51 is equal to the thickness of the circular arc elbow plate 5, and the width of the circular arc elbow plate panel 51 is 80-100mm.

[0030] The application also provides a preparation method of the above-mentioned multi-level connection structure of the end point of the submarine bulkhead main frame and the pressure shell, comprising: A section of the embedded section is arranged at the area close to the T-shaped longitudinal rib 4 of the bulkhead main frame web 61 and the bulkhead main frame panel 62, the embedded section is not installed in the field, and the other parts of the bulkhead main frame web 61 and the bulkhead main frame panel 62 are welded and completed in the field and the flat bulkhead 2; The T-shaped longitudinal rib web 41, the T-shaped longitudinal rib panel 42 and the T-shaped longitudinal rib elbow plate 43 are welded to form an integral T-shaped longitudinal rib 4 component in the field; The circular arc elbow plate 5 and the circular arc elbow plate panel 51 are welded to form an integral component in the field; After the completion of the construction of the pressure shell 1, the plate 3 is tightly assembled to the position of the pressure shell 1, the plate 3 is welded in the form of fillet weld around the pressure shell 1, and the plate 3 is connected with the pressure shell 1 through plug welding; After the flat bulkhead 2 is assembled with the pressure shell 1, the integral T-shaped longitudinal rib 4 component is assembled to the position and welded with the flat bulkhead 2, the pressure shell 1 and the plate 3 respectively; Then the embedded section arranged on the bulkhead main frame web 61 and the bulkhead main frame panel 62 is installed and welded to the position; Finally, the circular arc elbow plate 5 is assembled and welded with the bulkhead main frame panel 62 and the T-shaped longitudinal rib panel 42.

[0031] In order to verify the technical effect of the multi-stage connection structure of the end point of the main frame of the planar bulkhead of the submersible and the pressure hull, finite element models of the rib of the pressure hull, the pressure hull 1, the planar bulkhead 2, the main frame 6 of the planar bulkhead, and the different connection structures of the end point of the main frame of the planar bulkhead are established, and the effect of the different connection structures of the end point of the main frame of the planar bulkhead and the pressure hull is analyzed and calculated.

[0032] As shown in Figure 5 , five main frames of the planar bulkhead are arranged, which are vertical main beams I and II (symmetrical on the left and right sides), an upper horizontal beam IV, and a lower horizontal beam V. In order to perform comparative calculation, the upper end and the lower end of the vertical main beam II on the right side are provided with a plate + T-shaped longitudinal rib + triangular bracket structure, the right end of the upper horizontal beam IV and the right end of the lower horizontal beam V are provided with a plate + triangular bracket structure, and the other end points of the main frames of the planar bulkhead are provided with the multi-stage connection structure.

[0033] According to the traditional design method, Figure 1 , the maximum Von Mise stress of the points M and N where the main frame of the planar bulkhead is connected to the pressure hull is about 1.8σs and 1.6σs, respectively. Figure 6 As shown in Figure 2 , the maximum stress of the longitudinal rib web plate and the arc bracket at the end point of the main frame of the planar bulkhead appears near the points S and Q of the rib of the pressure hull. The maximum Von Mise stress at the point S is 905 MPa (about 1.15σs), and the maximum Von Mise stress at the point Q is 843 MPa (about 1.07σs), which is reduced by about 43%.

[0034] As shown in Figure 7 , the maximum normal stress of the panel of the T-shaped longitudinal rib + arc bracket structure at the end point of the main frame of the planar bulkhead is 1111 MPa, which is located in the arc area of the panel 51, and the high stress concentration will not affect the pressure hull 1 and the plate 3. The maximum normal stress of the panel of the triangular bracket structure is 1079 MPa, which is located at the connection between the panel and the plate 3, and the stress is directly applied to the plate and transmitted to the pressure hull 1.

[0035] The circumferential stress of the inner surface of the plate 3: the maximum value of the plate at the right end of the upper horizontal beam IV of the triangular bracket structure is 1485 MPa, and the maximum value of the plate at the right end of the lower horizontal beam V is 1155 MPa; the maximum value of the plate at the left end of the upper horizontal beam IV of the T-shaped longitudinal rib + arc bracket structure is 929 MPa, and the maximum value of the plate at the left end of the lower horizontal beam V is 705 MPa. The calculation results show that, under the same conditions of the main frame, the maximum circumferential stress of the inner surface of the plate is reduced by about 40% by using the T-shaped longitudinal rib + arc bracket structure compared with the triangular bracket structure.

[0036] The plate 3 has significant protection effect on the pressure-resistant shell 1. After the plate 3 is used, the longitudinal stress and circumferential stress cloud charts of the inner surface of the rib root of the pressure-resistant shell 1 are as follows: Figure 8 , Figure 9 The maximum longitudinal stress is 630 MPa, and the maximum circumferential stress is 770 MPa. The Von Mise stress cloud chart of the inner surface of the pressure-resistant shell 1 is as follows: Figure 10 The maximum Von Mise stress of the inner surface is 798 MPa (1.01σs), which is far less than the Von Mise stress of the M point (about 1.8σs) and the N point (about 1.6σs) of the framework and shell connected according to the traditional design method.

[0037] It should be noted that, according to the needs of implementation, each step / component described in the present application can be split into more steps / components, or two or more steps / components or part of the operation of the steps / components can be combined into a new step / component, so as to achieve the purpose of the present application.

[0038] The size of the serial number of each step in the above embodiment does not mean the order of execution. The execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0039] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present application.

Claims

1. A multi-stage connection structure between the endpoints of the main structure of the submersible bulkhead and the pressure hull, characterized in that: It includes a plate, a T-shaped longitudinal, a bulkhead main frame and an arc elbow plate; the plate is installed on the surface of the pressure shell; the T-shaped longitudinal includes a T-shaped longitudinal web and a T-shaped longitudinal panel, the T-shaped longitudinal web is connected to the plate, and the ends of the T-shaped longitudinal web and the T-shaped longitudinal panel are connected to the plane bulkhead; the bulkhead main frame includes a bulkhead main frame web and a bulkhead main frame panel, and the ends of the bulkhead main frame web and the bulkhead main frame panel are connected to the T-shaped longitudinal panel; the arc elbow plate is connected to the T-shaped longitudinal panel and the bulkhead main structure panel.

2. The multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to claim 1 is characterized in that: The T-shaped longitudinal bone further includes T-shaped longitudinal bone brackets located on both sides of the T-shaped longitudinal bone web, and the T-shaped longitudinal bone brackets are connected with the T-shaped longitudinal bone web and the T-shaped longitudinal bone face plate to form an integral structure.

3. The multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to claim 2 is characterized in that: The T-shaped longitudinal brackets are arranged in 3-4 groups along the length direction of the T-shaped longitudinal bones.

4. The multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to claim 1 is characterized in that: The edge of the circular arc bracket is provided with a circular arc bracket panel.

5. The multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to claim 1 is characterized in that: The distance between the plate and the bulkhead plate is 200-300mm, and a number of plug welding holes are opened on the plate. After the pressure hull is built, the plate and the pressure hull are tightly fitted and assembled in place. The plate is welded to the pressure hull in the form of fillet welds on all sides, and the plate is connected to the pressure hull through the plug welding holes.

6. The multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to claim 5, characterized in that: The position of the plug welding hole shall not coincide with the position of the T-type longitudinal web and the T-type longitudinal bracket, and the distance therebetween shall not be less than 50 mm.

7. The multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to claim 1 is characterized in that: The thickness of the plate is 0.8-1.0 times the thickness of the pressure shell, the width is 2.5-3.5 times the width of the T-type longitudinal frame panel, and the longitudinal length exceeds the T-type longitudinal frame web by 300-400mm; the plate material is high-strength steel for pressure shell.

8. The multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to claim 1, characterized in that: The height of the web of the T-shaped longitudinal is 200-300 mm, and the thickness is 1.0-1.2 times the thickness of the web of the bulkhead main frame; the width of the T-shaped longitudinal panel is equal to the width of the bulkhead main frame panel, and the thickness is 0.9-1.1 times the thickness of the bulkhead main frame panel; the total length of the T-shaped longitudinal is 2.5-3.5 times the height of the bulkhead main frame.

9. The multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to claim 1, characterized in that: The thickness of the arc bracket is 0.7-1.0 times the thickness of the web of the bulkhead main frame, the maximum profile width is equal to the height, which is 1.2-1.8 times the height of the bulkhead main frame, and the arc radius is 300-400mm; the thickness of the arc bracket panel is equal to the thickness of the arc bracket, and the width of the arc bracket panel is 80-100mm.

10. The method for preparing a multi-stage connection structure between the end points of the main structure of the submersible bulkhead and the pressure hull according to any one of claims 1 to 9, characterized in that: include: A patching section is provided in the area of ​​the bulkhead main structure web and bulkhead main structure face plate close to the T-shaped longitudinal, and the patching section is not installed in the inner field. The other parts of the bulkhead main structure web and bulkhead main structure face plate are welded to the plane bulkhead in the inner field; The T-type longitudinal web, T-type longitudinal face plate and T-type longitudinal bracket are welded in-field to form an integral T-type longitudinal component; The arc bracket and arc bracket panel are welded in the field to form an integral component; After the pressure hull is constructed, the plate is tightly fitted to the pressure hull and assembled in place. The plate is welded to the pressure hull in the form of fillet welds around the plate, and the plate is plug-welded to the pressure hull through the plug welding holes. After the flat bulkhead and pressure hull are assembled, the integral T-shaped longitudinal components are assembled in place and welded to the flat bulkhead, pressure hull and plate respectively; Then the bulkhead main frame web and bulkhead main frame faceplate patch sections are installed in place and welded; Finally, the arc bracket is assembled and welded to the bulkhead main frame panel and T-type longitudinal frame panel.

Images