Manufacturing and using method of marine reference platform

Abstract

According to the manufacturing and using method of the marine reference platform, the problem that a cabin horizontal base plane needs to be provided for installing a horizontal precision base and equipment is solved, and a theoretical horizontal reference of a cabin is formed. The manufacturing method comprises the steps that S100, the installation position and manufacturing indexes of an auxiliary reference platform of a ship are determined, and manufacturing of the auxiliary reference platform of the ship is completed; s200, the auxiliary reference platform is installed, and the installation process is recorded; s300, the auxiliary reference platform is calibrated; and S400, checking and protecting the auxiliary reference platform. According to the technical scheme, key links and requirements of each step are clarified to systematically solve the problem of full-period management of the ship reference platform, so that the whole manufacturing, mounting, calibration and detection process is allowed to follow, each precision index of the auxiliary reference platform is effectively controlled, precision loss caused by link disjunction is avoided, and the working efficiency is improved. Therefore, the accuracy of the horizontal reference is ensured, and a reliable reference is provided for high-precision installation of ship equipment.

Description

Technical Field

[0001] The present application relates to the field of shipbuilding, and in particular to a method for manufacturing and using a ship reference platform. Background Art

[0002] With the emergence of large ships and the requirements for horizontal accuracy of equipment installation, secondary reference platforms are of great significance in the manufacture of large ships. The secondary reference platform is the horizontal reference for the base processing and inspection, equipment and system alignment, and test and testing of cabins with horizontal accuracy requirements on large ships. The rectangular coordinate system formed by the hull horizontal plane and the centerline of the ship is called the deck coordinate system. Its X-axis points to the bow (in the centerline plane and parallel to the ship's baseline), its Y-axis points to the starboard side, and its Z-axis points upward. The XZ plane is the centerline plane of the ship, and the XY plane is the base plane of the ship. It can be used as a theoretical horizontal reference for the base processing, inspection, equipment and system alignment, and test and testing of the cabin with horizontal accuracy. The secondary reference platform is an entity that replaces the theoretical XY base plane of the cabin in engineering practice. It is usually installed on the deck of the centerline of the ship where the deformation of the entire ship is small.

[0003] Currently, the requirements for horizontal precision of equipment installation on large ships are constantly increasing, but existing secondary reference platform designs and manufacturing methods struggle to meet this demand. Existing technologies have numerous shortcomings in the fabrication, installation, calibration, inspection, and protection of secondary reference platforms, making them difficult to meet the stringent horizontal precision requirements of equipment installation in modern large-scale shipbuilding. Therefore, a technical solution that can effectively improve or resolve these technical issues is essential. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a method for manufacturing and using a ship-based reference platform, which is used to solve the problem of the need for a horizontal base plane in the cabin when installing horizontal precision bases and equipment in the ship's cabin, thereby forming a theoretical horizontal reference for the cabin.

[0005] In a first aspect, the present application provides a method for manufacturing a marine reference platform, comprising:

[0006] S100: Determine the installation position and manufacturing index of the secondary reference platform of the ship, and complete the manufacturing of the secondary reference platform of the ship;

[0007] S200: Install the secondary reference platform and record the installation process;

[0008] S300: calibrating the secondary reference platform;

[0009] S400: Inspect and protect the secondary reference platform.

[0010] In an optional implementation manner, in step S100, the secondary reference platform installation position is set as follows: three secondary reference platforms are respectively installed on the centerline decks of three cabins to be installed.

[0011] In an optional implementation manner, in step S100, creating an indicator includes:

[0012] Make sure the flatness of the secondary reference platform is between 0.005mm and 0.015mm;

[0013] The surface roughness of the sub-reference platform base panel is between 6.0μm and 7.0μm;

[0014] The surface roughness of the auxiliary reference platform panel is between 0.5μm and 1.5μm.

[0015] In an optional implementation manner, in step S100, creating an indicator includes:

[0016] Ensure that the deviation between the horizontality of the secondary reference platform in any direction and the horizontality of the ship reference platform is ≤ a″;

[0017] The size of the secondary reference platform is 250mm*200mm. Draw a circle with the center of the plane as the center. The diameter of the circle is Starting from the bow and stern direction, with the center of the circle as the starting point, make lines every 30°. The line depth is between 0.2mm and 0.4mm, the line width is between 0.15mm and 0.3mm, and the line error is less than or equal to b′;

[0018] The parallelism between the 0° and 180° markings on the secondary reference platform and the bow and stern line is ≤ c′;

[0019] The parallelism between the 0°~180° markings on the secondary reference platform panel and the initial bow and stern lines of the ship is ≤d'.

[0020] In an optional implementation manner, in step S200, the secondary reference platform installation process includes:

[0021] S201: Complete the welding and installation of the hull structure and main reinforcement structure. After the pads are in line with the inner bottom line shape, they are plug welded and then polished to a roughness that meets the design requirements.

[0022] S202: Positioning, cutting allowances, leveling, and bow and stern alignment of the secondary reference platform base are performed according to the secondary reference platform drawing and the secondary reference platform base drawing, and then the secondary reference platform base is positioned and installed at a preset position on the deck.

[0023] S203: After the secondary reference platform base is welded and stress released, the secondary reference platform is installed on the secondary reference platform base;

[0024] S204: After welding is completed, the out-of-tolerance items are fine-processed on the slipway until the installation of the secondary reference platform meets the design requirements.

[0025] In an optional embodiment, in step S300, the calibration method of the secondary reference platform is: using a level meter to measure the levelness of the three secondary reference platforms in the three cabins in the 0° to 180° direction and the 90° to 270° direction respectively; if the levelness of the secondary reference platform in a certain direction does not meet the technical requirements, the horizontal zero position of the secondary reference platform is adjusted until the requirements are met;

[0026] The technical requirement is that the horizontality between the secondary reference platform and the ship reference platform after adjustment is ≤ a″.

[0027] In an optional embodiment, in step S400, the protection method of the secondary reference platform is: after the installation of the secondary reference platform is completed, grease is applied to the panel of the secondary reference platform with a coating thickness of 4mm to 6mm; then a felt with a thickness of 6mm to 10mm is placed on the greased surface of the secondary reference platform, and finally the outer cover is laid and fixed.

[0028] In an optional implementation manner, in step S400, the method for inspecting the secondary reference platform is:

[0029] Check whether the secondary datum platform panel of each cabin is installed correctly, and the direction of the 0° mark on the platform panel is consistent with that shown in the base diagram and installation diagram, and the 0° mark is facing the bow direction; if an installation error occurs, re-purchase the panel; because one of the secondary datum platforms is installed on the deck of a cabin close to the fuel tank, fire is not allowed, so the secondary datum platform base and adjustment cylindrical base feet are retained, and the secondary datum platform panel is correctly installed while the ship is dry-docked.

[0030] In an optional implementation manner, before installing the secondary reference platform panel, a levelness check is required. The check points are 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, and 330°; the horizontal error at each point is ≤a″; if there is a deviation, adjustments are made until the horizontal deviation in any direction is ≤a″.

[0031] Secondly, the present application provides a method for using a ship-based reference platform. First, the method for manufacturing the secondary reference platform provided by the above-mentioned technical solution is used to complete the installation of the secondary reference platform. The method for using the secondary reference platform after installation is as follows: when a device in one of the three compartments undergoes mechanical displacement, the installed secondary reference platform is required to perform horizontal mechanical zero position alignment, and an optical inclinometer is used to measure the installation level of the device relative to the secondary reference platform in the 0°~180° direction and the 90°~270° direction, and the level of the device is adjusted until the requirements are met; wherein, the level of each device relative to the secondary reference platform is ≤E′.

[0032] Compared with the existing technology, the technical solution provided by this application has the following beneficial effects:

[0033] The method for fabricating a marine reference platform provided in this application systematically addresses the full-cycle management of a marine reference platform by clarifying the key steps and requirements of each step. This streamlines the entire fabrication, installation, calibration, and testing process, effectively controls the accuracy of the secondary reference platform, and avoids precision loss caused by improper process transitions. This ensures its accuracy as a horizontal reference, providing a reliable benchmark for high-precision installation of marine equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1a Shown is a schematic diagram of the structure of the secondary reference platform.

[0035] Figure 1b The diagram shows a schematic top view of the secondary reference platform;

[0036] Figure 2a to Figure 2c The secondary reference platform panel lines and the distribution diagrams of different cabins are displayed respectively;

[0037] Figure 3a Shown is a schematic diagram of the auxiliary reference platform base and outer cover from a top view;

[0038] Figure 3b Shown is a schematic diagram of the installation structure of the auxiliary reference platform base and outer cover;

[0039] Figure 3c Display as Figure 3b Schematic diagram of the enlarged structure at point A in the middle.

[0040] Description of the numbers in the figure:

[0041] 1. Nut; 2. Auxiliary reference platform panel; 3. First screw; 4. Cylindrical base foot; 5. Base; 6. Second screw; 7. Spring washer; 8. Outer cover. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0043] For ease of description, spatially relative terms such as "under," "below," "below," "below," "above," and "on" may be used herein to describe the relationship of one element or feature to other elements or features shown in the drawings. It will be understood that these spatially relative terms are intended to encompass orientations of the device in use or operation in addition to the orientation depicted in the drawings. Additionally, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may be present. As used herein, "between" is inclusive of both endpoints.

[0044] In the context of the present application, a structure described as a first feature being "above" a second feature may include embodiments where the first and second features are formed in direct contact, and may also include embodiments where an additional feature is formed between the first and second features, such that the first and second features may not be in direct contact.

[0045] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the illustrations 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.

[0046] Example 1:

[0047] 1 to 3 , this embodiment provides a method for manufacturing a ship reference platform, including the following steps.

[0048] S100: Determine the installation position and manufacturing indexes of the secondary reference platform of the ship, and complete the manufacturing of the secondary reference platform of the ship.

[0049] Specifically, the secondary datum platform installation locations are set by installing three of them on the centerline decks of the three cabins to be installed. The secondary datum platform is fabricated as shown in Figure 1 and consists of a secondary datum platform panel 2 made of Grade B steel, three cylindrical bases 4, three first screws 3, and nine nuts 1.

[0050] The production indicators of the sub-benchmark platform include the following aspects.

[0051] The flatness requirement of the secondary reference platform is determined to be between 0.005mm and 0.015mm, usually 0.01mm.

[0052] The surface roughness of the sub-reference platform base panel is between 6.0μm and 7.0μm, usually 6.3μm.

[0053] The surface roughness of the secondary reference platform panel is between 0.5μm and 1.5μm, usually 0.8μm.

[0054] Ensure that the deviation between the horizontality of the secondary reference platform in any direction and the horizontality of the ship reference platform is ≤ a".

[0055] As shown in Figure 1, the size of the secondary reference platform is 250mm*200mm, and the thickness of the secondary reference platform panel 2 is ≥20mm. The secondary reference platform base 5 is made as shown in Figure 3. The base 5 is welded with continuous fillet seams on both sides, and the bracket cut angle is 10X10. Draw a circle with the center of the plane as the center, and the diameter of the circle is Starting from the bow and stern direction, lines are engraved every 30° with the center of the circle as the starting point. The line depth is between 0.2mm and 0.4mm, the line width is between 0.15mm and 0.3mm, and the line error is less than or equal to b′, for example, the line error is less than or equal to 0.1°.

[0056] The parallelism between the 0° and 180° markings on the secondary reference platform and the bow and stern line is ≤ c′. For example, the parallelism between the 0° and 180° markings and the bow and stern line is ≤ 0.2 mm.

[0057] The parallelism between the 0°~180° markings on the secondary reference platform panel and the initial bow and stern lines of the ship is ≤d', d' is between 0.1mm and 0.5mm, and usually d' is 0.3mm.

[0058] The auxiliary reference platform base 5 is manufactured as shown in FIG3 . The base is continuously fillet welded on both sides, and the bracket cut angles are all 10*10.

[0059] S200: Install the secondary reference platform and record the installation process.

[0060] Specifically, as shown in Figure 2, during pre-installation in-field processing, the secondary datum platform and base 5 are welded and aligned in-field. Simultaneously, the markings on the secondary datum platform panel 2 and the panel of the base 5 are machined. After completion, the relevant design specifications of the secondary datum platform panel 2 and base 5 are tested and inspected as required. The accuracy of the markings on the secondary datum platform panel 2 must be confirmed by factory inspection before installation on board.

[0061] The main hull centerline correction is carried out according to the "slipway mounting process", which requires the hull centerline to be allocated to the front and rear of the secondary reference platform in the cabin.

[0062] The secondary datum platform must be installed after the hull structure and major reinforcements have been welded, the main hull has been closed, the main equipment in the cabin has been installed, and all surrounding welding and pyrotechnic correction work that may affect installation has been completed. The secondary datum platform should be installed at night when temperature fluctuations are minimal.

[0063] Furthermore, the installation procedure includes the following steps:

[0064] a) Preparation before installation

[0065] b) Check the correctness of the structure and materials according to the secondary reference platform base drawing.

[0066] c) Check cutting allowance and size.

[0067] d) Projects that need to be inspected during the on-site stage must complete quality inspection.

[0068] e) The quality of the instruments and tools used for installation should meet the requirements (see the table below):

[0069]

[0070]

[0071] The above instruments should have metrological certificates issued by relevant testing departments and be within the validity period. The measurement accuracy of the instruments should meet the measurement requirements of the measurement parameters.

[0072] f) Clean up the installation site and organize personnel division of labor.

[0073] Specifically, the secondary benchmark platform installation process includes:

[0074] S201: Complete the welding and installation of the hull structure and the main reinforcement structure. After the pad is consistent with the inner bottom line shape, it is welded by plug welding. After welding, it is polished until the roughness meets the design requirements. Relevant personnel will conduct self-inspection and mutual inspection.

[0075] S202: According to the secondary reference platform drawing and the secondary reference platform base drawing, the secondary reference platform base is positioned, the allowance is cut, the horizontal level is leveled, and the bow and stern lines are calibrated, and then it is positioned and installed at the preset position on the deck.

[0076] S203: After the welding of the auxiliary reference platform base is completed and the stress is released, the auxiliary reference platform is installed on the auxiliary reference platform base; the base should be self-inspected, mutually inspected by relevant personnel and submitted for special inspection. Only after the base is qualified can the next step of installing the auxiliary reference platform be carried out.

[0077] S204: After welding is completed, the out-of-tolerance items are fine-processed on the slipway by means of grinding and other means until the installation of the secondary reference platform meets the design requirements.

[0078] S205: Check the installation quality of the secondary reference platform. The specific quality inspection steps are as follows.

[0079] a) Check the flatness of the secondary reference platform: Use a 500mm, level 0, knife-edge template ruler and two pairs of level 2 μ gauge blocks for inspection. The flatness requirement is ≤0.01mm.

[0080] b) Check the levelness of the secondary reference platform: Use a TB100 high-precision optical inclinometer with an accuracy of 10" to check the levelness. The inspection points are 0° (360°), 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, and 330°. The horizontal error at each point is ≤ a". If the deviation is out of tolerance, scrape and adjust on site to make the horizontal deviation in any direction ≤ a".

[0081] c) Check the bow and stern line of the secondary reference platform: The parallelism between the 0° and 180° markings on the secondary reference platform and the bow and stern line of the ship shall be ≤ d′ (or ≤ 0.3 mm). Use the plumb line method or laser theodolite to check.

[0082] d) Inspection of surface roughness: Use a surface profiler to inspect, the surface roughness is ≤0.8μm.

[0083] e) Check the thickness of the platform panel: Use a special caliper or a special flat plate thickness gauge to check. The thickness of the base platform panel should be ≥ 20mm. After the installation of the auxiliary base platform, all indicators must be signed and confirmed by the relevant factory inspection personnel.

[0084] During the installation of the secondary benchmark platform and base, the preparation work and completion status of each process shall be truthfully recorded in the "Secondary Benchmark Platform Base Installation Process Record Form" and the "Secondary Benchmark Platform Installation Process Record Form" as the technical status management control document for the secondary benchmark installation.

[0085] Table 1 Auxiliary reference platform base installation process record

[0086]

[0087] Table 2 Secondary reference platform installation process record

[0088]

[0089] S300: calibrating the secondary reference platform;

[0090] The calibration method of the secondary reference platform is as follows: Use a spirit level to measure the levelness of the three secondary reference platforms in the three cabins (located in cabin 1, cabin 2, and cabin 3) in the directions of 0° to 180° and 90° to 270°. If the levelness of the secondary reference platform in a certain direction does not meet the technical requirements, the secondary reference platform will be adjusted to its zero position until it meets the requirements. The technical requirement is that the levelness of the secondary reference platform and the ship reference platform after adjustment is ≤ a".

[0091] Levelness test data record sheet

[0092] Instrument No.: Detection Time:

[0093] Instrument Name: Testing Location:

[0094] Equipment under test: Environmental conditions:

[0095]

[0096] Tester: Date:

[0097] Example 2:

[0098] This embodiment provides a method for using a ship-mounted reference platform. First, the secondary reference platform manufacturing method provided in Example 1 is used to complete the installation of the secondary reference platform. The method for using the secondary reference platform after installation is as follows: when a device in the three compartments undergoes mechanical displacement, it is necessary to use the installed secondary reference platform for horizontal mechanical zero position alignment, and use an optical inclinometer to measure the installation level of the device relative to the secondary reference platform in the 0°~180° direction and the 90°~270° direction, and adjust the level of the device until the requirements are met; wherein, the levelness of each device relative to the secondary reference platform is ≤E′.

[0099] The data is recorded in the following table:

[0100] Inertial navigation equipment horizontal mechanical zero alignment data record table

[0101] Instrument No.: Detection Time:

[0102] Instrument Name: Testing Location:

[0103] Equipment under test: Environmental conditions:

[0104]

[0105]

[0106] Tester: Date:

[0107] Example 3:

[0108] This embodiment provides a method for inspecting and protecting a secondary reference platform, which is a subsequent extended step S400 of the method for manufacturing the secondary reference platform.

[0109] Optionally, the secondary reference platform is inspected as follows:

[0110] As shown in Figure 2, when installing the panel of the secondary reference platform, please note that the 0° mark must be installed in the bow position. However, it is possible that the installation direction may be incorrect. Once an installation error occurs, use the following method to correct it.

[0111] S401: Check whether the secondary reference platform panel of each compartment is installed correctly. The direction of the 0° mark on the platform panel should be consistent with that shown in the base drawing and installation drawing, and the 0° mark direction should be towards the bow.

[0112] S402: After an installation error occurs, re-purchase the panel according to the relevant drawings.

[0113] S403: Because one of the auxiliary reference platforms is installed on a deck adjacent to the fuel tank where a cabin is located, fire is not allowed. Only the auxiliary reference platform base and the adjustment cylindrical base can be retained.

[0114] S404: When the vessel is in dry dock, the platform panel is installed. The installation process is as follows:

[0115] First, open the protective cover, handle with care, and check the levelness using a TB100 high-precision optical inclinometer with an accuracy of 10". Check points are 0° (360°), 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, and 330°. The horizontal error at each point is ≤ a". If the deviation is out of tolerance, scrape and adjust on site to make the horizontal deviation in any direction ≤ a".

[0116] a) Inspection of the bow and stern lines of the secondary reference platform

[0117] The parallelism between the 0° and 180° markings on the secondary reference platform and the bow and stern lines is ≤ d′ (or ≤ 0.3 mm). Use the plumb line method or laser theodolite to check.

[0118] b) Inspection of surface roughness

[0119] The surface roughness was checked with a surface profilometer and was ≤0.8μm.

[0120] c) Check the thickness of the platform panel

[0121] Use a special caliper or a special flat plate thickness gauge to check that the thickness of the reference platform panel is ≥20mm.

[0122] After the installation of the secondary reference platform is completed, all indicators must be signed and confirmed by the relevant factory inspection personnel.

[0123] Optionally, the protection method of the secondary reference platform is:

[0124] After the secondary datum platform is installed, apply grease to the secondary datum platform panel to a thickness of 4mm to 6mm. Then, place 6mm to 10mm thick felt on the greased secondary datum platform surface. As an example, the grease is applied to a thickness of 5mm. Then, place 8mm thick felt on the greased secondary datum platform surface. Finally, lay the outer cover and secure it with four second screws 6, i.e., bolts and nuts with a specification of M8X16.

[0125] In summary, the technical solution of this application provides a method for fabricating, installing, calibrating, and testing a marine secondary reference platform. This method addresses the need for a cabin base plane required for installing a horizontal precision base and equipment, thereby forming a theoretical horizontal reference for the cabin. Therefore, the technical solution provided by this application effectively overcomes various shortcomings of the existing technology and possesses high industrial application value.

[0126] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A method for manufacturing a marine reference platform, characterized in that: include: S100: Determine the installation position and manufacturing index of the secondary reference platform of the ship, and complete the manufacturing of the secondary reference platform of the ship; S200: Install the secondary reference platform and record the installation process; S300: calibrating the secondary reference platform; S400: Inspect and protect the secondary reference platform.

2. The method for manufacturing a marine reference platform according to claim 1, wherein: In step S100, the secondary reference platform installation position is set in the following manner: three secondary reference platforms are respectively installed on the centerline decks of three cabins to be installed.

3. The method for manufacturing a marine reference platform according to claim 1, characterized in that: In step S100, creating indicators includes: Make sure the flatness of the secondary reference platform is between 0.005mm and 0.015mm; The surface roughness of the sub-reference platform base panel is between 6.0μm and 7.0μm; The surface roughness of the auxiliary reference platform panel is between 0.5μm and 1.5μm.

4. The method for manufacturing a ship reference platform according to claim 3, characterized in that: In step S100, creating indicators includes: Ensure that the deviation between the horizontality of the secondary reference platform in any direction and the horizontality of the ship reference platform is ≤ a″; The secondary reference platform has a size of 250mm*200mm. A circle with a diameter of φ=180mm is drawn with the center of the plane as the center. Starting from the bow and stern directions, lines are engraved every 30° with the center of the circle as the starting point. The line depth is between 0.2mm and 0.4mm, the line width is between 0.15mm and 0.3mm, and the line error is less than or equal to b′. The parallelism between the 0° and 180° markings on the secondary reference platform and the bow and stern line is ≤ c′; The parallelism between the 0°~180° markings on the secondary reference platform panel and the initial bow and stern lines of the ship is ≤d'.

5. The method for manufacturing a ship reference platform according to claim 1, characterized in that: In step S200, the secondary reference platform installation process includes: S201: Complete the welding and installation of the hull structure and main reinforcement structure. After the pads are in line with the inner bottom line shape, they are plug welded and then polished to a roughness that meets the design requirements. S202: Positioning, cutting allowances, leveling, and bow and stern line correction of the secondary reference platform base are performed according to the secondary reference platform drawing and the secondary reference platform base drawing, and then positioning and installing it at the preset position on the deck; S203: After the secondary reference platform base is welded and stress released, the secondary reference platform is installed on the secondary reference platform base; S204: After welding is completed, the out-of-tolerance items are fine-processed on the slipway until the installation of the secondary reference platform meets the design requirements.

6. The method for manufacturing a ship reference platform according to claim 2, characterized in that: In step S300, the secondary reference platform is calibrated by using a level meter to measure the levelness of the three secondary reference platforms in the three cabins in the 0° to 180° direction and the 90° to 270° direction. If the levelness of the secondary reference platform in a certain direction does not meet the technical requirements, the secondary reference platform is adjusted to zero position until the requirements are met. The technical requirement is that the horizontality between the secondary reference platform and the ship reference platform after adjustment is ≤ a″.

7. The method for manufacturing a marine reference platform according to claim 1, wherein: In step S400, the protection method of the secondary reference platform is: after the secondary reference platform is installed, grease is applied to the panel of the secondary reference platform with a coating thickness of 4mm to 6mm; then a felt with a thickness of 6mm to 10mm is placed on the greased surface of the secondary reference platform, and finally the outer cover is laid and fixed.

8. The method for manufacturing a ship reference platform according to claim 1, characterized in that: In step S400, the secondary reference platform is inspected by: Check whether the secondary reference platform panel of each compartment is installed correctly, and the direction of the 0° mark on the platform panel is consistent with that shown in the base diagram and installation diagram, and the 0° mark direction is towards the bow; If installation errors occur, re-purchase the panel; Because one of the auxiliary reference platforms is installed on a deck adjacent to the fuel tank where a fire is not allowed, the auxiliary reference platform base and the adjustment cylindrical base feet are retained, and the auxiliary reference platform panel is correctly installed while the ship is dry-docked.

9. The method for manufacturing a ship reference platform according to claim 8, characterized in that: Before installing the secondary reference platform panel, a level check is required. The check points are 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, and 330°. The horizontal error at each point is ≤a″. If there is any deviation, adjustments are made until the horizontal deviation in any direction is ≤a″.

10. A method for using a marine reference platform, characterized in that: First, the secondary reference platform is installed by the manufacturing method provided in claims 1 to 9. The method of using the secondary reference platform after installation is as follows: when a device in the three compartments undergoes mechanical displacement, the installed secondary reference platform is required to perform horizontal mechanical zero position alignment, and an optical inclinometer is used to measure the installation level of the device relative to the secondary reference platform in the directions of 0° to 180° and 90° to 270°, and the level of the device is adjusted until the requirements are met; wherein, the level of each device relative to the secondary reference platform is ≤E′.

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