Stern block construction method

Abstract

The invention provides a stern block construction method which comprises the following steps: assembling a first stern block, and adjusting the assembling of the first stern block according to a preset precision requirement in the process; a second stern block is assembled and carried with the first stern block to form a stern shaft mounting section, then a shaft system is mounted, and assembly of the second stern block and assembly of the shaft system are adjusted according to the preset precision requirement in the process; a third stern block is assembled and carried with the stern shaft mounting section, then a rudder system is mounted, and assembly of the third stern block is adjusted according to the preset precision requirement in the process; and installing the main engine and connecting the main engine with the shaft system, and adjusting the position of the main engine according to the matching precision requirement of the main engine and the shaft system in the process. According to the technical scheme of the invention, the method can achieve the precision tracking of the whole process for all key parts of the stern block of the ship, thereby reducing the final accumulated error, shortening the subsequent adjustment and possible reworking time, and effectively improving the building efficiency and precision of the ship.

Description

Technical Field

[0001] The present application relates to the field of shipbuilding, and in particular to a method for constructing a stern section. Background Art

[0002] During the construction of the stern of a ship, the precision control of key components such as the stern hull, main engine, shaft system, and rudder system is the core link to ensure the performance and safety of the ship. However, with the acceleration of ship construction speed and the improvement of production efficiency, the accuracy of ship stern construction faces many challenges. On the one hand, factors such as welding deformation of the stern hull structure, deformation of the dock pier under force, deformation of deadweight, and unreasonable support settings often cause the installation accuracy of the main engine, shaft system, and rudder system to exceed the tolerance range, causing rework or even scrapping, seriously affecting the overall performance and safety of the ship. On the other hand, the precision management of ship construction not only needs to consider the accuracy of individual components, but also needs to pay attention to the mutual influence between components. For example, the deformation of the hull structure will directly affect the installation accuracy of the main engine and shaft system, and the installation accuracy of the shaft system and rudder system will have a chain reaction on the navigation performance of the ship. In addition, the installation accuracy of the ship's shaft system and rudder system is crucial. The installation accuracy of the shaft system directly affects the power transmission efficiency and navigation stability of the ship, while the installation accuracy of the rudder system is related to the ship's control performance and navigation safety.

[0003] However, in the prior art, usually after the overall construction of the stern hull is completed, the installation accuracy of key components such as the main engine, shaft system and rudder system is tracked and corrected separately, that is, there is a lack of full-process tracking of the entire stern construction process, and it is difficult to eliminate assembly errors in each construction link in a timely manner. Therefore, errors in each link continue to accumulate, which brings a lot of unnecessary troubles to the subsequent testing and adjustment process. When the accumulated error is too large, it may even lead to large-scale rework, seriously affecting the construction progress of the ship. Therefore, it is necessary to introduce full-process precision management work in the ship stern construction method, manage the precision in each construction link in a timely manner, and avoid the accumulation of errors that are too large and affect the construction progress of the ship. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a stern section construction method, which can achieve full-process precision tracking of key components of the stern section of a ship, thereby reducing the final cumulative error, shortening subsequent adjustments and possible rework time, and effectively improving ship construction efficiency and construction accuracy.

[0005] The present application provides a method for constructing a stern section, wherein the stern section comprises a first stern section, a second stern section and a third stern section which are connected to each other; a main engine, a shaft system and a rudder system of a ship are arranged in the stern section, wherein the shaft system comprises an intermediate shaft, a stern shaft and a propeller, the main engine and the intermediate shaft are arranged in the first stern section, the stern shaft and the propeller are arranged in the second stern section, and the rudder system is arranged in the third stern section. The stern section construction method comprises the following steps: assembling the first stern section, and during the assembly process, adjusting the assembly condition of the first stern section according to the accuracy requirements of the main engine installation; assembling the second stern section, and then mounting the first stern section and the second stern section to form a stern shaft-mounting section, and installing the shaft system in the stern shaft-mounting section; in the process of forming the stern shaft-mounting section and installing the shaft system, adjusting the assembly condition of the second stern section and the assembly condition of the shaft system according to the accuracy requirements of the section mounting and the accuracy requirements of the shaft system installation. assemble the stern third general section, mount the stern third general section and the stern shaft section to form the stern general section, and then install the rudder system in the stern general section; in the process of assembling the stern third general section and installing the rudder system, adjust the assembly of the stern third general section according to the accuracy requirements of the general section mounting, the accuracy requirements of the rudder system installation, and the matching accuracy requirements of the rudder system and the shaft system; install the main engine in the stern general section and connect the main engine with the shaft system. During the connection process, adjust the position of the main engine according to the matching accuracy requirements of the main engine and the shaft system.

[0006] In an implementable solution, a main engine installation position for installing the main engine is provided on the upper surface of the first stern section. The process of adjusting the assembly condition of the first stern section according to the accuracy requirements of the main engine installation includes the following steps: setting a plurality of first section monitoring points around the main engine installation position; performing precision measurement operations on each first section monitoring point respectively, and then analyzing the measurement data to obtain precision analysis results of various parameters of the main engine installation position; and adjusting the hull structure of the first stern section accordingly according to various precision analysis results.

[0007] In an implementable scheme, the process of adjusting the assembly condition of the second stern section according to the precision requirements of the section mounting and the shaft system installation includes the following steps: setting a plurality of second section monitoring points on the upper surface of the second stern section, and setting a plurality of shaft system monitoring points on the shaft system; in the process of forming the stern shaft installation section, performing precision measurement operations on each second section monitoring point, and then analyzing the measurement data to obtain precision analysis results on the matching condition of the second stern section and the first stern section; in the process of installing the shaft system, performing precision measurement operations on each shaft system monitoring point, and obtaining precision analysis results on the matching condition of the stern shaft installation section and the shaft system; according to the precision analysis results, making corresponding adjustments to the hull structure of the second stern section and the matching condition of the second stern section, the first stern section and the shaft system.

[0008] In an implementable solution, after the stern shaft mounting section is formed, at the connection between the stern second section and the stern first section, the upper surface of the stern second section is higher than the upper surface of the main engine mounting position of the stern first section by a preset distance.

[0009] In an practicable solution, the stern section also includes a propeller shaft connecting section in which the stern shaft is installed. After the first stern section and the second stern section are mounted, the propeller shaft connecting section and the second stern section are mounted to form a stern shaft installation section. A plurality of propeller shaft monitoring points are arranged on the surface of the propeller shaft connecting section, and all the propeller shaft monitoring points together form a monitoring plane, and the center line of the stern shaft is located in the monitoring plane.

[0010] In an implementable solution, the rudder system includes a rudder cylinder fixedly arranged on the third overall section of the stern and a rudder blade rotatable relative to the rudder cylinder. The process of adjusting the assembly condition of the stern third section according to the accuracy requirements of section mounting, the accuracy requirements of rudder system installation, and the matching accuracy requirements of the rudder system and the shaft system includes the following steps: setting a plurality of third section monitoring points on the upper surface of the stern third section, and setting a plurality of rudder system monitoring points on the rudder tube; in the process of mounting the stern third section and the stern shaft-mounted section, respectively carrying out accuracy measurement operations on each third section monitoring point, and then analyzing the measurement data to obtain the accuracy analysis results of the matching condition of the stern third section and the stern shaft-mounted section; in the process of installing the rudder system, respectively carrying out accuracy measurement operations on each rudder system monitoring point, and then analyzing the measurement data to obtain the accuracy analysis results of the matching condition of the stern third section and the rudder system; according to the accuracy analysis results, the hull structure of the stern third section, the matching condition of the stern third section and the stern shaft-mounted section, and the matching condition of the stern third section and the rudder system are adjusted accordingly.

[0011] In an implementable solution, after the stern section is formed, the sinking amount of the stern third section is analyzed by finite element simulation calculation and big data analysis methods, and the anti-deformation amount of the stern third section is increased accordingly according to the analysis results.

[0012] In an implementable solution, the process of adjusting the position of the main engine according to the matching accuracy requirements of the main engine and the shaft system includes the following steps: setting multiple main engine monitoring points on the main engine; during the process of hoisting the main engine, performing precision measurement operations on each main engine monitoring point, and then analyzing the measurement data to obtain precision analysis results on the matching of the main engine and the shaft system; and adjusting the position of the main engine accordingly based on the precision analysis results.

[0013] In one feasible solution, it also includes establishing a unified precision management platform for real-time collection and storage of all precision measurement data generated in the entire construction process and analyzing them to obtain corresponding precision analysis results.

[0014] Compared with the prior art, the beneficial effects of this application include at least:

[0015] The present application provides a method for constructing a stern section, in which a special precision management process is set up at each stage of the stern section construction process, and the precision tracking of the whole process is realized for each key component of the stern section of the ship (including the hull, main engine, shaft system, and rudder system of the stern section), so that the precision of each key link in the stern section construction process can be accurately controlled, reducing the final cumulative error, shortening the subsequent adjustment and possible rework time, thereby effectively improving the ship construction efficiency and construction accuracy. By improving the construction accuracy of the stern of the ship, the present application can improve the power transmission efficiency and control performance of the ship during navigation, reduce energy loss, mechanical wear, vibration and noise, thereby improving the operation efficiency and service life of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic flow chart of a method for constructing a stern section according to an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the structure of the stern section;

[0019] Figure 3 is a schematic diagram of the first overall section of the stern;

[0020] Figure 4 A schematic diagram of the monitoring point setting scheme for the first general section;

[0021] Figure 5 is a schematic diagram of the second stern section;

[0022] Figure 6 This is a schematic diagram of the third stern section;

[0023] Figure 7 Schematic diagram of the propeller shaft connection segment and propeller shaft monitoring point setting scheme.

[0024] In the figure: 1. first stern section; 2. second stern section; 3. third stern section; 4. propeller shaft connection section; 5. main engine; 6. shaft system; 7. rudder system; 101. main engine installation position; 401. monitoring plane; 601. intermediate shaft; 602. stern shaft; 603. propeller; 701. rudder tube; 702. rudder blade. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] like Figure 1-Figure 3 and Figure 5-Figure 6 As shown, the stern section includes a first stern section 1, a second stern section 2 and a third stern section 3 which are connected to each other. The main engine 5, shaft system 6 and rudder system 7 of the ship are arranged in the stern section, wherein the shaft system 6 includes an intermediate shaft 601, a stern shaft 602 and a propeller 603, the main engine 2 and the intermediate shaft 601 are arranged in the first stern section 1, the stern shaft 602 and the propeller 603 are arranged in the second stern section 2, and the rudder system 7 is arranged in the third stern section 3. The stern section construction method includes the following steps:

[0028] Assembling the first stern section 1, during the assembly process, adjusting the assembly condition of the first stern section 1 according to the accuracy requirements of the main engine 5 installation;

[0029] Assemble the stern second overall section 2, then mount the stern first overall section 1 and the stern second overall section 2 to form a stern shaft-mounting section, and install the shaft system 6 in the stern shaft-mounting section; in the process of forming the stern shaft-mounting section and installing the shaft system 6, adjust the assembly conditions of the stern second overall section 2 and the shaft system 6 according to the accuracy requirements of the overall section mounting and the accuracy requirements of the shaft system 6 installation;

[0030] Assemble the third stern section 3, mount the third stern section 3 and the stern shaft section to form the stern section, and then install the rudder system 7 in the stern section; in the process of assembling the third stern section 3 and installing the rudder system 7, adjust the assembly of the third stern section 3 according to the accuracy requirements of mounting the section, the accuracy requirements of installing the rudder system 7, and the matching accuracy requirements of the rudder system 7 and the shaft system 6;

[0031] The main engine 5 is installed in the stern section and connected to the shaft system 6. During the connection process, the position of the main engine 5 is adjusted according to the matching accuracy requirements between the main engine 5 and the shaft system 6.

[0032] The present application provides a method for constructing a stern section, in which a special precision management process is set up at each stage of the stern section construction process, and the precision tracking of the whole process is realized for each key component of the stern section of the ship (including the hull, main engine, shaft system, and rudder system of the stern section), so that the precision of each key link in the stern section construction process can be accurately controlled, effectively reducing the final cumulative error, shortening the subsequent adjustment and possible rework time, thereby effectively improving the ship construction efficiency and construction accuracy. By improving the construction accuracy of the stern of the ship, the present application can improve the power transmission efficiency and control performance of the ship during navigation, reduce energy loss, mechanical wear, vibration and noise, thereby improving the operation efficiency and service life of the ship.

[0033] In addition, before carrying out the stern section construction method of the present application, a unified precision management platform can be first established to collect and store all precision measurement data generated in the entire construction process in real time and analyze them to obtain corresponding precision analysis results. Specifically, the unified precision management platform can include a data acquisition module, a data storage module, a data analysis module, a controller and control software, and a visualization display module to achieve real-time monitoring, storage, analysis and reporting of data, and use charts and dashboards to intuitively display precision data so that technicians can quickly grasp the construction status of the ship. Furthermore, data calibration function, deviation warning function, historical data analysis function, and multi-system integration function can also be set for the unified precision management platform, and no excessive restrictions are made here.

[0034] In the actual shipbuilding process, in order to improve the shipbuilding efficiency, multiple ships are usually built at the same time in a dock. For example, two ships can be built at the same time, and the construction processes of the two ships are usually not synchronized. There will be a situation where one ship is completed and needs to be launched, while the other is still under construction. Therefore, after the shaft system 6 is installed in the stern shaft installation section, water can be poured into the dock to carry out the half-ship floating process for the stern shaft installation section, and at the same time, the launching process can be carried out for other ships that have been completed. After the launching process is completed, the water in the dock is discharged, so that the stern shaft installation section falls back to the designed construction position to end the half-ship floating process, and then the subsequent construction process continues. Since the stern shaft section has left the designed and constructed position during the half-ship floating process, it is necessary to adjust the position and angle of the stern shaft section after the half-ship floating process is completed, and check whether the relative position change of the stern first section 1, the stern second section 2 and the shaft system 6 exceeds the preset standard. If so, it is necessary to re-adjust the assembly of the stern first section 1, the stern second section 2 and the shaft system 6 according to the accuracy requirements of the main engine 5 installation, the accuracy requirements of the section loading and the accuracy requirements of the shaft system 6 installation, so that the stern shaft section can accurately return to the designed and constructed position, and the purpose is to eliminate the negative impact of the half-ship floating process on the accuracy of the stern shaft section. Specifically, the key position of the stern shaft section can be measured using a laser total station or other measuring equipment to ensure that the stern shaft section can still meet the preset accuracy requirements.

[0035] In one embodiment, if Figure 3 As shown, the upper surface of the first stern section 1 is provided with a main engine installation position 101 for installing the main engine 5. The process of adjusting the assembly condition of the first stern section 1 according to the accuracy requirement of the installation of the main engine 5 includes the following steps:

[0036] A plurality of first general section monitoring points are arranged around the host installation position 101;

[0037] Carry out precision measurement operations on each first general section monitoring point respectively, and then analyze the measurement data to obtain precision analysis results of various parameters of the main engine installation position 101;

[0038] According to the results of various precision analyses, the hull structure of the first stern section is adjusted accordingly.

[0039] In the actual process, the horizontality and coplanarity of the upper surface of the host installation position 101 and the straightness of the center line of the host installation position 101 can be ensured to meet the preset requirements according to the results of various precision analysis. Specifically, the horizontality tolerance of the upper surface of the host installation position 101 can be controlled within ±5mm, the coplanarity tolerance can be controlled within ±4mm, and the straightness deviation of the center line of the host installation position 101 can be controlled within ±3mm.

[0040] Preferably, if Figure 4 As shown, five first total section monitoring points can be set on both sides of the main engine installation position, and all the first total section monitoring points can be uniformly numbered, for example, they can be numbered from M1 to M10. Specifically, the horizontality of the main engine installation position 101 can be measured using a laser total station at each first total section monitoring point, and then the measurement data of all the first total section monitoring points can be summarized and analyzed. If the measurement data shows that the first total section monitoring points are not in the same horizontal plane, the angle of the stern first total section 1 can be adjusted accordingly until the horizontality tolerance of the upper surface of the main engine installation position 101 is controlled within ±5mm. Similarly, the coplanarity of the main engine installation position 101 and the centerline straightness of the main engine installation position 101 can also be measured and adjusted in a similar manner.

[0041] In one embodiment, the process of adjusting the assembly condition of the stern second section 2 according to the accuracy requirements of the section mounting and the accuracy requirements of the shaft system 6 installation includes the following steps:

[0042] A plurality of second overall section monitoring points are arranged on the upper surface of the stern second overall section 2, and a plurality of shaft system monitoring points are arranged on the shaft system 6;

[0043] In the process of forming the stern shaft-mounting section, precision measurement operations are carried out on each second section monitoring point respectively, and then the measurement data are analyzed to obtain the precision analysis results on the matching condition of the stern second section 2 and the stern first section 1;

[0044] During the installation of shaft system 6, precision measurement operations are carried out on each shaft system monitoring point, and the precision analysis results of the matching between the stern shaft section and shaft system 6 are obtained;

[0045] According to the results of various precision analyses, the hull structure of the second stern section 2 and the coordination between the second stern section 2, the first stern section 1 and the shaft system 6 are adjusted accordingly.

[0046] In the actual process, according to the results of various precision analysis, it can be ensured that the horizontality and coplanarity of the upper surface of the second main stern section 2 and the deviation between the center line of the stern shaft section and the center line of the shaft system 6 meet the preset requirements. Specifically, the tolerance of the horizontality of the upper surface of the second stern section 2 can be controlled within ±5mm, the tolerance of coplanarity can be controlled within ±4mm, the horizontal deviation between the center line of the stern shaft section and the center line of the shaft system 6 can be controlled within ±3mm, and the vertical deviation can be controlled within ±5mm.

[0047] In one embodiment, after the stern shaft mounting section is formed, at the connection between the stern second section and the stern first section, the upper surface of the stern second section 2 is higher than the upper surface of the main engine installation position 101 of the stern first section 1 by a preset distance to form a step structure, which is convenient for the subsequent positioning of the main engine 5 of the ship, thereby reducing the possibility of displacement of the main engine 5. Specifically, the preset distance can be controlled to 10mm-15mm.

[0048] In one embodiment, if Figure 2 As shown, the stern section also includes a propeller shaft connecting section 4 in which the stern shaft 602 is installed. After the stern first section 1 and the stern second section 2 are mounted, the propeller shaft connecting section 4 is mounted with the stern second section 2 to form a stern shaft installation section. A plurality of propeller shaft monitoring points are arranged on the surface of the propeller shaft connecting section 4, and all the propeller shaft monitoring points together form a monitoring plane, and the center line of the stern shaft 602 is located in the monitoring plane.

[0049] like Figure 7 As shown, four propeller shaft monitoring points can be set on the surface of the propeller shaft connection segment 4, numbered A1, A2, B1, and B2, respectively, wherein A1 and A2 are respectively located on the left and right sides of the end surface of the propeller shaft connection segment 4 close to the bow end of the ship, and B1 and B2 are respectively located on the left and right sides of the end surface of the propeller shaft connection segment 4 close to the stern end of the ship. Specifically, during the construction process, a laser total station can be used to monitor the positions of all propeller shaft monitoring points in real time, and the precision of the propeller shaft connection segment 4 can be managed by the relative height of each propeller shaft monitoring point. For example, if A1 is higher than B1, it means that there is a vertical deviation between the center line of the stern shaft 602 and the center line of the intermediate shaft 601. If A1 is higher than A2, it means that there is a horizontal deviation between the center line of the stern shaft 602 and the center line of the intermediate shaft 601. Specifically, the horizontal deviation between the center line of the stern shaft 602 and the center line of the intermediate shaft 601 can be controlled within ±3 mm, and the vertical deviation between the center line of the stern shaft 602 and the center line of the intermediate shaft 601 can be controlled within ±5 mm.

[0050] In one embodiment, if Figure 2 As shown, the rudder system 7 includes a rudder barrel 701 fixedly arranged on the stern third section 3 and a rudder blade 702 rotatable relative to the rudder barrel 701. The process of adjusting the assembly of the stern third section according to the accuracy requirements of the section mounting, the accuracy requirements of the rudder system installation, and the matching accuracy requirements of the rudder system and the shaft system includes the following steps:

[0051] A plurality of third section monitoring points are arranged on the upper surface of the stern third section 3, and a plurality of rudder system monitoring points are arranged on the rudder cylinder 701;

[0052] In the process of mounting the stern third section 3 and the stern shaft mounting section, precision measurement operations are respectively carried out on each monitoring point of the third section, and then the measurement data are analyzed to obtain precision analysis results on the matching condition of the stern third section 3 and the stern shaft mounting section;

[0053] During the installation of the rudder system 7, precision measurement is performed on each rudder system monitoring point, and then the measurement data is analyzed to obtain precision analysis results on the coordination between the third stern section 3 and the rudder system 7;

[0054] According to the results of various precision analyses, the hull structure of the third stern section 3, the matching between the third stern section 3 and the stern shaft mounting section, and the matching between the third stern section 3 and the rudder system 7 are adjusted accordingly.

[0055] In the actual process, based on the results of various precision analyses, it can be ensured that the horizontality and coplanarity of the upper surface of the third stern section 3, the deviation between the center line of the rudder barrel 701 and the vertical line of the upper surface of the third stern section 3, and the deviation between the center line of the rudder barrel 701 and the center line of the shaft system 6 meet the preset requirements.

[0056] Specifically, the horizontal tolerance of the upper surface of the third stern section 3 can be controlled within ±5 mm, and the coplanarity tolerance can be controlled within ±4 mm. Figure 7 As shown, for the stern third section 3 composed of multiple sections, the end surface coplanarity tolerance of each section connection part can also be controlled within ±4mm. In addition, the deviation between the center line of the rudder barrel 701 and the vertical line on the upper surface of the stern third section 3 can be controlled within ±5mm along the bow and stern direction of the ship, and the deviation along the left and right direction of the ship can be controlled within ±5mm. The center line of the rudder barrel 701 should be located in the vertical plane and perpendicular to the center line of the shaft system 6. Specifically, the vertical line of the center line of the shaft system 6 in the vertical plane can be set as the reference line, and then the deviation between the center line of the rudder barrel 701 and the reference line can be controlled within ±4mm. At this time, it can be considered that the installation accuracy of the rudder system 7 meets the preset accuracy requirements. Since the rudder barrel 701 is fixedly arranged on the stern third section 3, when the installation accuracy of the rudder system 7 meets the preset accuracy requirements, it can be considered that the installation accuracy of the stern third section 3 also meets the preset accuracy requirements.

[0057] In one embodiment, after the stern section is formed, the sinking amount of the stern third section 3 can be analyzed by finite element simulation calculation and big data analysis methods, and the anti-deformation amount of the stern third section 3 can be increased accordingly according to the analysis results.

[0058] Since the third stern section 3 is located at one end of the stern section close to the stern of the ship, it is easy to produce a certain amount of sinking under the influence of gravity, thereby affecting the assembly accuracy. Therefore, it is necessary to add a certain amount of anti-deformation in advance to offset the influence of the sinking. In the actual construction process, the theoretical calculation can be combined with the empirical correction method, that is, the theoretical sinking obtained by finite element simulation calculation and the actual sinking law obtained by big data analysis are combined to determine the amount of anti-deformation to be applied. The anti-deformation should be able to offset the deformation that may occur in the third stern section 3 during the subsequent loading and welding process. In addition, when determining the anti-deformation, a certain safety factor should be considered to cope with possible uncertainties, such as welding process fluctuations or material performance differences. The technicians can select the safety factor based on the actual engineering experience and design requirements. For example, the safety factor range can be set to 1.1-1.2. Specifically, during the construction process, the amount of reverse deformation can be applied by adjusting the welding sequence, adding support points, presetting deformation, etc. For example, a support structure can be set at a part of the third stern section 3, and the height and position of the support structure can be adjusted to make the third stern section 3 in a preset reverse deformation state before welding. By analyzing the sinking amount of the third stern section 3 and increasing the amount of reverse deformation for it, the construction accuracy of the stern section can be significantly improved, and rework and scrapping caused by deformation errors can be reduced, thereby improving construction efficiency, reducing production costs, and improving the overall performance and reliability of the ship.

[0059] In one embodiment, the process of adjusting the position of the main machine according to the matching accuracy requirements of the main machine and the shaft system includes:

[0060] Set up multiple host monitoring points on host 5;

[0061] During the process of hoisting the main engine 5, precision measurement operations are carried out on each main engine monitoring point, and then the measurement data are analyzed to obtain precision analysis results on the matching of the main engine 5 and the shaft system 6;

[0062] According to the results of various precision analyses, the position of the host 5 is adjusted accordingly.

[0063] During the installation of the main engine 5, the horizontal deviation between the center line of the main engine 5 and the center line of the shaft system 6 can be controlled within ±7mm, and the vertical deviation can be controlled within ±10mm. Specifically, after the main engine 55 is hoisted to the predetermined position, the center line of the main engine 5 and the center line of the shaft system 6 can be preliminarily aligned in the horizontal and vertical directions by adjusting the position of the hoisting point of the hoisting equipment, and then the deviation between the center line of the main engine 5 and the center line of the shaft system 6 can be monitored in real time using a laser total station or other measuring equipment. When there is a horizontal deviation or a vertical deviation between the center line of the shaft system 6 and the center line of the main engine 5, the horizontal deviation or the vertical deviation can be reduced by adjusting the stern shaft margin or adjusting the amount of epoxy resin used to fix the main engine 5, so as to meet the preset requirements.

[0064] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for constructing a stern section, wherein the stern section comprises a first stern section, a second stern section and a third stern section which are connected to each other; a main engine, a shaft system and a rudder system of a ship are arranged in the stern section, wherein the shaft system comprises an intermediate shaft, a stern shaft and a propeller, the main engine and the intermediate shaft are arranged in the first stern section, the stern shaft and the propeller are arranged in the second stern section, and the rudder system is arranged in the third stern section; characterized in that: The stern section construction method includes: Assemble the first stern section. During the assembly process, adjust the assembly of the first stern section according to the accuracy requirements of the main engine installation; Assemble the second stern section, then mount the first stern section and the second stern section to form the stern shaft section, and install the shaft system in the stern shaft section; in the process of forming the stern shaft section and installing the shaft system, adjust the assembly of the second stern section and the shaft system according to the accuracy requirements of the section mounting and the accuracy requirements of the shaft system installation; Assemble the third stern section, mount the third stern section and the stern shaft section to form the stern section, and then install the rudder system in the stern section; in the process of assembling the third stern section and installing the rudder system, adjust the assembly of the third stern section according to the accuracy requirements of the section mounting, the accuracy requirements of the rudder system installation, and the matching accuracy requirements of the rudder system and the shaft system; The main engine is installed in the stern section and connected to the shaft system. During the connection process, the position of the main engine is adjusted according to the matching accuracy requirements of the main engine and the shaft system.

2. The method for constructing a stern section according to claim 1, characterized in that: The upper surface of the first stern section is provided with a main engine installation position for installing the main engine; the process of adjusting the assembly condition of the first stern section according to the accuracy requirement of the main engine installation includes: A plurality of first-section monitoring points are arranged around the host installation location; Carry out precision measurement work on each first-section monitoring point respectively, and then analyze the measurement data to obtain the precision analysis results of various parameters of the main engine installation position; According to the results of various precision analyses, the hull structure of the first stern section is adjusted accordingly.

3. The method for constructing a stern section according to claim 1, characterized in that: The process of adjusting the assembly of the second stern section according to the accuracy requirements of the section loading and the accuracy requirements of the shaft system installation includes: A plurality of second overall section monitoring points are arranged on the upper surface of the stern second overall section, and a plurality of shaft system monitoring points are arranged on the shaft system; In the process of forming the stern shaft-mounting section, precision measurement operations are carried out on each second section monitoring point respectively, and then the measurement data are analyzed to obtain precision analysis results on the matching conditions of the stern second section and the stern first section; During the installation of the shaft system, precision measurement operations are carried out on each shaft system monitoring point, and the precision analysis results of the matching between the stern shaft section and the shaft system are obtained; According to the results of various precision analyses, corresponding adjustments are made to the hull structure of the second stern section and the coordination between the second stern section, the first stern section and the shaft system.

4. The method for constructing a stern section according to claim 1, characterized in that: After the stern shaft mounting section is formed, at the connection between the stern second section and the stern first section, the upper surface of the stern second section is higher than the upper surface of the main engine mounting position of the stern first section by a preset distance.

5. The method for constructing a stern section according to claim 1, characterized in that: The stern section also includes a propeller shaft connecting section in which the stern shaft is installed. After the first stern section and the second stern section are mounted, the propeller shaft connecting section is mounted with the second stern section to form a stern shaft installation section. A plurality of propeller shaft monitoring points are arranged on the surface of the propeller shaft connection segment, and all the propeller shaft monitoring points together form a monitoring plane, and the center line of the stern shaft is located in the monitoring plane.

6. The method for constructing a stern section according to claim 1, characterized in that: The rudder system includes a rudder barrel fixedly arranged on the third stern section and a rudder blade rotatable relative to the rudder barrel; the process of adjusting the assembly of the third stern section according to the accuracy requirements of the section loading, the accuracy requirements of the rudder system installation, and the matching accuracy requirements of the rudder system and the shaft system includes: A plurality of third section monitoring points are arranged on the upper surface of the third section at the stern, and a plurality of rudder system monitoring points are arranged on the rudder tube; During the process of mounting the stern third section and the stern shaft mounting section, precision measurement operations are carried out on each monitoring point of the third section, and then the measurement data are analyzed to obtain precision analysis results on the matching conditions of the stern third section and the stern shaft mounting section; During the installation of the rudder system, precision measurement is carried out on each rudder system monitoring point, and then the measurement data is analyzed to obtain the precision analysis results on the coordination between the third stern section and the rudder system; According to the results of various precision analyses, corresponding adjustments are made to the hull structure of the third stern section, the coordination between the third stern section and the stern shaft mounting section, and the coordination between the third stern section and the rudder system.

7. The method for constructing a stern section according to claim 1, characterized in that: After the stern section is formed, the sinking amount of the third stern section is analyzed by finite element simulation calculation and big data analysis methods, and the anti-deformation amount of the third stern section is increased accordingly according to the analysis results.

8. The method for constructing a stern section according to claim 1, characterized in that: The process of adjusting the position of the main engine according to the matching accuracy requirements of the main engine and the shaft system includes: Set up multiple host monitoring points on the host; During the process of hoisting the main engine, precision measurement is carried out on each monitoring point of the main engine, and then the measurement data is analyzed to obtain the precision analysis results on the matching condition of the main engine and the shaft system; According to the results of each precision analysis, the position of the host is adjusted accordingly.

9. The method for constructing a stern section according to claim 1, characterized in that: It also includes the establishment of a unified precision management platform for real-time collection and storage of all precision measurement data generated in the entire construction process and analysis to obtain corresponding precision analysis results.

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