Hull stern tube housing assembly method and hull assembly method
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI WAIGAOQIAO SHIP BUILDING CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-14
Smart Images
Figure CN120517563B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of ship assembly technology, and in particular to a method for assembling a stern shaft housing and a method for assembling a ship hull. Background Technology
[0002] The stern tube, also known as the stern shaft housing, is a crucial structure through which the stern shaft protrudes from the hull. In shipbuilding, the stern tube is a key component connecting the main engine and propeller, and its assembly precision directly affects the ship's power transmission efficiency and navigation safety. In existing technologies, the stern tube typically employs a three-section design, assembled in the order of aft bearing section → tube body section → forward bearing section.
[0003] However, in actual assembly, the extremely limited assembly space between the stern shaft housing and the hull docking sections, coupled with the stern shaft housing's large size and heavy weight, makes hoisting, positioning, and welding operations extremely difficult. Limited by the confined assembly space, operators struggle to precisely align and secure the three sections of the stern shaft housing, leading to a significant increase in concentricity deviation between the aft bearing section, the shaft tube body section, and the forward bearing section. In severe cases, this can even cause the boring machining accuracy to exceed tolerances, failing to meet the coaxiality requirements for shaft system installation (e.g., overall coaxiality must be controlled within ≤1mm). Furthermore, excessive concentricity deviation can exacerbate bearing wear and cause seal failure, significantly increasing the ship's later maintenance costs and potentially threatening navigational safety due to abnormal shaft system vibration and reduced power transmission efficiency. Summary of the Invention
[0004] The purpose of this application is to provide a method for assembling a stern shaft housing and a hull assembly method, in order to solve to some extent the problems existing in the prior art, such as the extremely limited assembly space between the stern shaft housing and the docking sections of the hull, and the large size and heavy weight of the stern shaft housing itself, which makes hoisting, positioning and welding operations extremely difficult. Due to the limited assembly space, operators find it difficult to accurately align and fix the three sections of the stern shaft housing structure, which leads to a significant increase in the concentricity deviation between the aft bearing section, the shaft tube body section and the forward bearing section. In severe cases, it can even lead to the boring machining accuracy exceeding the tolerance, failing to meet the coaxiality requirements of shaft system installation.
[0005] According to a first aspect of this application, a method for assembling a stern shaft housing is provided. The stern shaft housing includes a first bearing section, a shaft tube body section, and a second bearing section that can be sequentially connected to each other along the axial direction of the shaft tube of the stern shaft housing. The first bearing section is used for docking with the hull.
[0006] The steps include:
[0007] Assemble the first bearing section, the shaft tube body section, and the second bearing section;
[0008] Connect the first bearing section to the hull, and hoist the first bearing section to the docking section with the hull;
[0009] The first bearing section is subject to horizontal management;
[0010] Fix the first bearing segment, and weld the first bearing segment and the docking segment together;
[0011] The shaft tube body section and the second bearing section are welded together to form a two-section connecting body;
[0012] Connect the two connecting sections to the first bearing section, and hoist the two connecting sections to the first bearing section for connection;
[0013] The two connecting sections are managed horizontally;
[0014] Fix the two connecting sections, and weld the first bearing section and the two connecting sections together.
[0015] Preferably, the welding methods involved in the three steps of welding the first bearing segment and the docking segment, welding the shaft tube body segment and the second bearing segment, and welding the first bearing segment and the two connecting segments are all dual-station symmetrical welding.
[0016] Preferably, in the step of welding the shaft tube body section and the second bearing section, the shaft tube body section and the second bearing section are placed vertically on a horizontal operating table so that the axis of the shaft tube body section and the axis of the second bearing section are both parallel to the direction of gravity.
[0017] With both the axis of the shaft tube body segment and the axis of the second bearing segment parallel to the direction of gravity, the shaft tube body segment and the second bearing segment are joined together.
[0018] Preferably, a first plumb line and a second plumb line are used to mark the axis of the shaft tube body segment and the axis of the second bearing segment, respectively. The concentricity of the shaft tube body segment and the second bearing segment is determined by whether the first plumb line and the second plumb line are aligned.
[0019] Preferably, in the step of horizontal management of the first bearing segment, the two ends of the first bearing segment in the axial direction are selected as management points, and four-point management is performed for each management point.
[0020] Preferably, in the horizontal management step of the two connecting sections, the two ends of the shaft tube body section and the two ends of the second bearing section in the axial direction are selected as management points, and four-point management is performed for each management point.
[0021] Preferably, the four-point management involves managing the positions of four points on the stern shaft shell: the highest point, the lowest point, the leftmost point, and the rightmost point.
[0022] Preferably, in the step of assembling the first bearing segment, the shaft tube body segment, and the second bearing segment, the axial direction of the shaft tube of the first bearing segment, the shaft tube body segment, and the second bearing segment is used as a reference.
[0023] The installation positions of the DK plates and the central reinforcing bars of the first bearing section, the shaft tube body section, and the second bearing section are offset by a predetermined dimension relative to the positions on the drawing in the opposite direction of welding deformation.
[0024] Preferably, in the step of assembling the first bearing segment, the shaft tube body segment, and the second bearing segment, the three segments are assembled in the order of inside to outside.
[0025] According to the second aspect of this application, a hull assembly method is provided, including the hull stern shaft housing assembly method described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of the hull stern shaft housing assembly method, which will not be repeated here.
[0026] Compared with the prior art, the beneficial effects of this application are as follows:
[0027] The stern shaft housing assembly method provided in this application replaces the traditional three-section sequential docking with a method that first assembles the first bearing section, then pre-connects the shaft tube body section and the second bearing section into two connecting sections, and finally completes the overall docking. This step-by-step assembly method effectively reduces the difficulty of operation in a confined space due to the large overall volume of the stern shaft housing, making lifting and alignment operations easier and reducing the complexity and difficulty of the assembly operation. Furthermore, this stern shaft housing assembly method allows for independent horizontal management of the first bearing section and the two connecting sections, making it easier to control the positional accuracy of each part compared to assembling all three sections simultaneously. Through step-by-step adjustments, the coaxiality of each section along the axial direction can be more accurately guaranteed, significantly reducing concentricity deviations caused by the confined assembly space and effectively avoiding precision deviations during boring. In addition, the first bearing section is first docked and fixedly welded to the hull to form a stable assembly foundation, upon which the two connecting sections are then docked and fixedly welded. This gradual fixing method avoids mutual interference and displacement caused by the lack of fixing of individual sections during traditional assembly, enhancing the overall stability of the assembly process and improving the reliability of the connection between the stern shaft housing and the hull. Furthermore, the improved assembly precision effectively reduces problems such as abnormal bearing wear and seal failure caused by excessive concentricity deviations, extending the service life of the stern shaft housing and related components, reducing the frequency and cost of later ship maintenance and repair, and improving the economy and safety of ship operation.
[0028] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0030] Figure 1 A cross-sectional structural diagram of the stern shaft shell provided in an embodiment of this application;
[0031] Figure 2 A schematic diagram of dual-station symmetrical welding of the stern shaft housing provided in an embodiment of this application;
[0032] Figure 3 A schematic diagram of four-point management of the horizontal management points of the stern shaft shell provided in this application embodiment;
[0033] Figure 4 This is a schematic diagram of the isometric structure of the stern shaft housing provided in Embodiment 1 of this application;
[0034] Figure 5 This is a schematic diagram of the isometric structure of the stern shaft housing provided in Embodiment 2 of this application;
[0035] Figure 6 This is a schematic diagram of the isometric structure of the stern shaft housing provided in Embodiment 3 of this application;
[0036] Figure 7 A schematic diagram of the exploded structure of the stern shaft shell provided in this application embodiment.
[0037] Figure label:
[0038] 1-Stern shaft housing; 10-Shaft tube; 11-First bearing section; 12-Shaft tube body section; 13-Second bearing section. Detailed Implementation
[0039] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.
[0040] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.
[0041] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0042] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0044] The following reference Figures 1 to 7 This application describes a method for assembling a stern shaft housing 1 and a method for assembling a hull, according to some embodiments thereof.
[0045] See Figures 1 to 7 As shown, an embodiment of the first aspect of this application provides a method for assembling a stern shaft housing, wherein the stern shaft housing 1 includes a first bearing section 11, a shaft tube body section 12, and a second bearing section 13 that can be sequentially connected to each other along the axial direction of the shaft tube 10 of the stern shaft housing 1, wherein the first bearing section 11 is used for docking with the hull.
[0046] The above-mentioned stern shaft housing assembly method includes the following steps:
[0047] Step S010: Assemble the first bearing section 11, the shaft tube body section 12, and the second bearing section 13.
[0048] Preferably, in the assembly steps of the first bearing section 11, the shaft tube body section 12, and the second bearing section 13, the axial direction of the shaft cylinder 10 of the first bearing section 11, the shaft tube body section 12, and the second bearing section 13 are used as references. The installation positions of the DK plate and the middle rib of the first bearing section 11, the shaft tube body section 12, and the second bearing section 13 are offset by a predetermined dimension relative to the position on the drawing in the opposite direction of welding deformation. In this way, on the one hand, the thermal stress generated during welding can easily cause deformation of each segment of the tail shaft housing, affecting the overall assembly accuracy. Offsetting the installation positions of the DK plate and the middle rib in the opposite direction of welding deformation by a predetermined dimension is based on the prediction of the welding deformation law, and actively compensates for the deformation generated during welding through "reverse pre-deformation". After welding stress is released and components deform, the offset DK plate and central keel can return to their theoretical positions, ensuring the relative positional accuracy of the first bearing section 11, the shaft tube body section 12, and the second bearing section 13, maintaining the coaxiality of the shaft tube 10 axis, and avoiding boring deviations or shaft installation problems caused by deformation. By pre-offsetting the installation position, the amount of welding deformation is significantly reduced, reducing or even eliminating the need for subsequent correction processes. On the other hand, precise control of the installation position of the DK plate and central keel enables a more stable structural system to be formed after the welding of each section of the stern shaft housing. As a key connecting component, the DK plate and the central keel are the main load-bearing structures. The accurate installation of their positions ensures that the stress distribution of the stern shaft housing is uniform when subjected to loads such as propeller thrust and torque, avoiding local stress concentration, enhancing the overall structural strength and reliability of the stern shaft housing, and extending the service life of the ship.
[0049] like Figures 4 to 6 As shown in the figure, the three different forms of the above-mentioned stern shaft shell 1 are shown. The dashed arrows in the figure indicate the trend of the above-mentioned welding deformation, and the actual arrows in the figure indicate the direction of the above-mentioned reverse offset.
[0050] Preferably, in the assembly steps of the first bearing section 11, the shaft tube body section 12, and the second bearing section 13, all three are assembled in an inside-out sequence. This has several advantages. First, the inside-out assembly sequence allows operators to focus on the precise installation and calibration of key internal components without external structural interference. For example, it enables precise adjustment of the flatness and coaxiality of the bearing mounting surface, ensuring the dimensional accuracy of the sealing groove, and preventing limited internal adjustment space due to the initial fixing of the external structure. This effectively improves the assembly quality of the internal structure and lays the foundation for stable shaft operation. Second, the inside-out assembly sequence makes the assembly process clearer and more standardized, with close connections between each process. This avoids operators repeatedly moving between the inside and outside, reducing rework and adjustment time caused by a chaotic assembly sequence, and improving overall assembly efficiency. Simultaneously, the quality of each step can be effectively controlled, avoiding quality fluctuations caused by improper sequence and ensuring the stability and consistency of the tail shaft housing assembly quality. Furthermore, in a confined assembly space, installing the external structure first may hinder the hoisting and positioning of internal components, increasing assembly difficulty and safety risks. The inside-out sequence allows each segment to be hoisted into place smoothly, reducing the risk of collisions and squeezing due to space constraints, lowering the workload and safety hazards for operators in complex environments, and improving the safety and operability of the assembly process.
[0051] Preferably, such as Figure 7 As shown in the figure, the exploded structure diagram of the stern shaft shell 1 is shown. (N) shown in the figure represents the assembly sequence of the components of the stern shaft shell 1, that is, bottom to top and inside to outside.
[0052] Instructions are required. Figure 7 The structures of each component of the stern shaft housing 1 shown are existing structures in the art (for example, the structures of each component of the stern shaft section described in Chinese patent document CN116353791A-Ship Stern Shaft Section Construction Method), and will not be described again here.
[0053] Step S020: Connect the first bearing section 11 to the hull by hoisting the first bearing section 11 to the docking section with the hull.
[0054] Step S030: Perform horizontal management on the first bearing section 11.
[0055] Preferably, such as Figure 1 As shown, in the horizontal management step of the first bearing segment 11, the two ends of the first bearing segment 11 in the axial direction are selected as management points (i.e., Figure 1Points A and B are shown. Four-point management is carried out for each management point. In this way, by selecting the two ends of the first bearing segment 11 in the axial direction as management points, the levelness and concentricity of the first bearing segment 11 are effectively guaranteed.
[0056] Specifically, the above four-point management can refer to the location of the managed points (e.g., Figure 1 The highest point of the shaft sleeve 10 of the stern shaft housing 1 (i.e., points A, B, or points C, D, E, and F shown below) is... Figure 3 Point T shown), the lowest point (i.e. Figure 3 Point B shown), the leftmost point (i.e. Figure 3 Point L shown) and the rightmost point (i.e., Figure 3 Position management is performed on the R point shown, that is, the distances of OT, OB, OL and OR are measured respectively and compared with the theoretical radius of the shaft cylinder 10 to determine the offset direction of the shaft cylinder 10, and then the corresponding position of the shaft cylinder 10 is adjusted according to the offset direction to achieve the adjustment of the concentricity of the management point.
[0057] Step S040: Fix the first bearing section 11 and weld the first bearing section 11 and the docking section.
[0058] Preferably, the welding method for the first bearing segment 11 and the butt joint segment involved in the above step S040 can be dual-station symmetrical welding.
[0059] Specifically, such as Figure 2 As shown, this dual-station symmetrical welding refers to two welding stations starting from opposite ends of the aforementioned shaft cylinder 10 in the radial direction and performing butt welding in the same clockwise direction. Thus, during the butt welding process between the first bearing section 11 and the butt-joint section of the shaft cylinder 10, the two welding stations are always positioned radially opposite each other. This allows the welding internal stresses generated by the two welding stations on the shaft cylinder 10 to cancel each other out, ensuring that the first bearing section 11 and the butt-joint section remain coaxial with high precision after welding. This lays the foundation for the smooth butt welding of the subsequent shaft body section 12 and the second bearing section 13. Furthermore, the simultaneous operation of the two welding stations directly reduces the welding time by nearly half, accelerating the assembly process. The same clockwise welding sequence also makes it easier for the welders on both sides to maintain consistent operating rhythm and welding parameters, resulting in uniform and stable weld penetration, width, and reinforcement height. This effectively reduces welding defects such as incomplete penetration and undercut, ensuring consistent welding quality and reducing rework costs caused by quality issues.
[0060] In step S050, the shaft tube body section 12 and the second bearing section 13 are welded to form a two-section connector.
[0061] Similarly, the welding method of the shaft tube body section 12 and the second bearing section 13 involved in the above step S050 can also be a dual-station symmetrical welding. Its beneficial effect is similar to that of the first bearing section 11 and the butt joint section which are welded together by dual-station symmetrical welding. It will not be described again here.
[0062] Preferably, in the step of welding the shaft body section 12 and the second bearing section 13, the shaft body section 12 and the second bearing section 13 are placed vertically on a horizontal operating table, so that the axis of the shaft body section 12 and the axis of the second bearing section 13 are both parallel to the direction of gravity. With the axis of the shaft body section 12 and the axis of the second bearing section 13 both parallel to the direction of gravity, the shaft body section 12 and the second bearing section 13 are joined. Thus, when placed vertically, the shaft body section 12 and the second bearing section 13 naturally droop under gravity, and the axis tends to be vertically stable due to gravity, effectively avoiding axis offset or bending caused by the weight of the sections. Compared to horizontal assembly, which requires additional tooling to offset the effect of weight, this method utilizes gravity to naturally calibrate the axis, significantly reducing concentricity deviation caused by assembly posture, ensuring precise coaxiality of the two axis sections, providing a high-precision foundation for subsequent docking with the first bearing section 11, and reducing the risk of cumulative overall assembly errors.
[0063] Preferably, a first plumb line and a second plumb line are used to mark the axis of the shaft tube body segment 12 and the axis of the second bearing segment 13, respectively. The concentricity of the shaft tube body segment 12 and the second bearing segment 13 is determined by whether the first plumb line and the second plumb line are aligned. In this way, the plumb line, utilizing the characteristic that the direction of gravity is always vertically downward, can quickly and intuitively show the axial position of the shaft tube body segment 12 and the second bearing segment 13. By visually observing or simply measuring whether the two plumb lines are aligned, the operator can quickly determine the concentricity of the two segments. Compared with using complex instruments for multi-point measurement, this significantly shortens the inspection time and greatly improves assembly efficiency, making it particularly suitable for rapid inspection and adjustment on the construction site. As a simple and inexpensive tool, the plumb line does not require precise and expensive measuring equipment such as laser collimators and total stations, reducing inspection costs. At the same time, its operation method is simple and easy to understand, with low technical requirements for operators. Even in complex construction site environments, it can be easily used, avoiding measurement errors caused by improper instrument operation, making concentricity inspection convenient and efficient.
[0064] Step S060: Connect the two connecting sections to the first bearing section 11, and hoist the two connecting sections to connect with the first bearing section 11.
[0065] Step S070: Perform horizontal management on the two connecting sections.
[0066] Preferably, such as Figure 1As shown, in the horizontal management step of the two connecting sections, the two ends of the shaft tube body section 12 in the axial direction (i.e., Figure 1 Points C and D shown) and the two ends of the second bearing segment 13 in the axial direction (i.e. Figure 1 Points E and F shown are used as management points. Four-point management is carried out for each management point. The horizontal management method and beneficial effects of the two connecting sections are similar to those of the first bearing section 11 mentioned above, and will not be repeated here.
[0067] Step S080: Fix the two connecting sections and weld the first bearing section 11 and the two connecting sections.
[0068] Similarly, the welding method of the first bearing segment 11 and the two connecting segments involved in the above step S080 can also be a dual-station symmetrical welding. Its beneficial effect is similar to that of the first bearing segment 11 and the butt joint segment which are welded together by dual-station symmetrical welding, and will not be repeated here.
[0069] According to the stern shaft housing assembly method provided by the aforementioned technical features, this method replaces the traditional three-section sequential docking with the assembly of the stern shaft housing by first assembling the first bearing section 11, then pre-connecting the shaft tube body section 12 and the second bearing section 13 into two connecting sections, and finally completing the overall docking. This step-by-step assembly method effectively reduces the difficulty of operation in a confined space due to the large overall volume of the stern shaft housing, making lifting and alignment operations easier to implement, and reducing the complexity and difficulty of the assembly operation. Furthermore, this stern shaft housing assembly method allows for independent horizontal management of the first bearing section 11 and the two connecting sections, making it easier to control the positional accuracy of each part compared to assembling all three sections simultaneously. Through step-by-step adjustments, the coaxiality of each section along the axial direction can be more accurately guaranteed, significantly reducing the concentricity deviation problem caused by the confined assembly space, and effectively avoiding precision deviations during boring machining. In addition, the first bearing section 11 is first docked and fixedly welded to the hull to form a stable assembly foundation, on which the two connecting sections are then docked and fixedly welded. This gradual fixing method avoids mutual interference and displacement caused by the lack of fixing of individual sections during traditional assembly, enhancing the overall stability of the assembly process and improving the reliability of the connection between the stern shaft housing and the hull. Furthermore, the improved assembly precision effectively reduces problems such as abnormal bearing wear and seal failure caused by excessive concentricity deviations, extending the service life of the stern shaft housing and related components, reducing the frequency and cost of later ship maintenance and repair, and improving the economy and safety of ship operation.
[0070] The second aspect of this application also provides a hull assembly method, including the hull stern shaft housing assembly method described in any of the above embodiments. Therefore, it has all the beneficial technical effects of the hull stern shaft housing assembly method, which will not be repeated here.
[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A method for assembling a ship's stern shaft housing, characterized in that, The stern shaft housing includes a first bearing section, a shaft tube body section, and a second bearing section that can be sequentially connected to each other along the axial direction of the shaft tube of the stern shaft housing, wherein the first bearing section is used to connect with the hull. The steps include: Assemble the first bearing section, the shaft tube body section, and the second bearing section; Connect the first bearing section to the hull, and hoist the first bearing section to the docking section with the hull; The first bearing section is subject to horizontal management; Fix the first bearing segment, and weld the first bearing segment and the docking segment together; The shaft tube body section and the second bearing section are welded together to form a two-section connecting body; Connect the two connecting sections to the first bearing section, and hoist the two connecting sections to the first bearing section for connection; The two connecting sections are managed horizontally; Fix the two connecting sections, and weld the first bearing section and the two connecting sections together. In the step of welding the shaft tube body section and the second bearing section, the shaft tube body section and the second bearing section are placed vertically on a horizontal operating table so that the axis of the shaft tube body section and the axis of the second bearing section are both parallel to the direction of gravity. With both the axis of the shaft tube body segment and the axis of the second bearing segment parallel to the direction of gravity, the shaft tube body segment and the second bearing segment are joined together.
2. The stern shaft housing assembly method according to claim 1, characterized in that, The welding methods involved in the three steps of welding the first bearing section and the docking section, welding the shaft tube body section and the second bearing section, and welding the first bearing section and the two connecting sections are all dual-station symmetrical welding.
3. The stern shaft housing assembly method according to claim 1, characterized in that, The axis of the shaft tube body segment and the axis of the second bearing segment are marked by a first plumb line and a second plumb line, respectively. The concentricity of the shaft tube body segment and the second bearing segment is determined by whether the first plumb line and the second plumb line are aligned.
4. The stern shaft housing assembly method according to claim 1, characterized in that, In the horizontal management step of the first bearing segment, the two ends of the first bearing segment in the axial direction are selected as management points, and four-point management is performed for each management point.
5. The stern shaft housing assembly method according to claim 1, characterized in that, In the horizontal management step of the two connecting sections, the two ends of the shaft tube body section and the two ends of the second bearing section in the axial direction are selected as management points, and four-point management is performed for each management point.
6. The stern shaft housing assembly method according to claim 4 or 5, characterized in that, The four-point management refers to the position management of four points on the stern shaft shell of the ship: the highest point, the lowest point, the leftmost point, and the rightmost point.
7. The stern shaft housing assembly method according to claim 1, characterized in that, In the step of assembling the first bearing segment, the shaft tube body segment, and the second bearing segment, the axial direction of the shaft tube of the first bearing segment, the shaft tube body segment, and the second bearing segment is used as the reference. The installation positions of the DK plates and the central reinforcing bars of the first bearing section, the shaft tube body section, and the second bearing section are offset by a predetermined dimension relative to the positions on the drawing in the opposite direction of welding deformation.
8. The stern shaft housing assembly method according to claim 1, characterized in that, In the step of assembling the first bearing segment, the shaft tube body segment, and the second bearing segment, the three segments are assembled in the order of inside to outside.
9. A method for assembling a ship's hull, characterized in that, The method for assembling the stern shaft housing according to any one of claims 1 to 8.