A method for closing a ship section based on a floating platform

Abstract

The application belongs to the technical field of ship engineering, and specifically discloses a ship section closing method based on a floating platform, which takes a unified ship coordinate system of ship design as a reference, and sequentially completes homologous reference system surveying of a to-be-closed section and the floating platform, three-dimensional measurement and closing simulation of the section, port pre-repair, left section transfer positioning and reference locking, right section alignment, and finally closes and connects the two sections, thereby realizing zero-interference one-time closing of large ship sections on the floating platform.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, and in particular to a method for assembling ship sections based on a floating platform. Background Technology

[0002] Modern large shipbuilding generally adopts a modular modular construction model, dividing the hull into multiple large sections. After prefabrication on a land-based horizontal slipway, these sections are transported to the assembly station for joining and assembly. This model can significantly shorten the occupation period of the core dock / slipway, enable parallel operation at multiple workstations, and significantly improve the overall efficiency of shipbuilding, making it the mainstream technical route in the global shipbuilding industry. Currently, most mature methods for controlling the precision of ship section assembly in the industry are developed for the assembly conditions of fixed rigid platforms in the dock. The core operation process is: section transportation to the location → on-site measurement of the gap at the assembly joint → end allowance trimming → alignment adjustment → assembly welding. Under the stable working conditions of a fixed rigid platform, this type of method can achieve stable precision control through a fixed benchmark, which can meet the precision requirements of conventional shipbuilding.

[0003] However, existing technologies have significant limitations for the special working conditions of floating platforms. Their benchmark system cannot be stably controlled, resulting in uncontrollable accuracy and making them unsuitable for the construction needs of floating platform operations. Summary of the Invention

[0004] The purpose of this invention is to provide a method for assembling ship sections based on a floating platform, so as to solve the technical problem that the existing technology cannot adapt to the construction requirements of floating platform operations.

[0005] To achieve the above objectives, embodiments of the present invention provide a method for assembling ship sections based on a floating platform, comprising the following steps: Step S1: Based on the unified hull coordinate system of the ship design, mark the left longitudinal section and the left hull inspection line on the left merging section, and mark the right longitudinal section and the right hull inspection line on the right merging section. Step S2: Based on the same hull coordinate system of Step S1 and the actual dimensions of the assembled hull, mark the left stop line corresponding to the left longitudinal section line, the right stop line corresponding to the right longitudinal section line, and the rib inspection stop line corresponding to both the left and right rib inspection lines on the floating platform. Step S3: Perform three-dimensional measurements and model the left and right closure segments; Step S4: Based on the same hull coordinate system of Step S1, combine the measured reference data of the floating platform with the overall model in Step S3 to perform a merging simulation. The left longitudinal section line coincides with the left stop line, the right longitudinal section line coincides with the right stop line, and the left merging rib inspection line and the right merging rib inspection line both coincide with the rib inspection stop line. Step S5: Based on the closure simulation results of Step S4, mark the left cutting line and the left inspection line parallel to the left closure section with a fixed spacing on the left closure section; mark the right cutting line and the right inspection line parallel to the right cutting line with a fixed spacing on the right closure section. Step S6: Cut and correct the left merging segment according to the left cutting line drawn in step S5 to construct the left merging end. Cut and correct the right merging segment according to the right cutting line drawn in step S5 to construct the right merging end. Step S7: Transfer the left closure section to the floating platform, so that the left longitudinal section line coincides with the left stop line and the left closure rib inspection line coincides with the rib inspection stop line, thus completing the temporary fixation of the left closure section. Step S8: Using the temporarily fixed left longitudinal section and left rib inspection line of the left closure section as a unified reference, transfer the right closure section to the floating platform to complete the alignment, so that the right longitudinal section coincides with the right stop line and the right rib inspection line coincides with the rib inspection stop line. Step S9: Complete the joining and docking of the left and right merging ends to form the ship section.

[0006] Preferably, in steps S1 to S9, the unified hull coordinate system consists of intersecting X-axis, Y-axis and Z-axis, wherein the X-axis is the length direction of the ship section from bow to stern, the Y-axis is the width direction of the ship section from one side to the other, and the Z-axis is the height direction of the ship section. The X-axis, Y-axis and Z-axis intersect at the origin of the unified hull coordinate system.

[0007] Preferably, in step S1, the left longitudinal section line is located at a distance of 17350mm from the origin along the Y-axis, and the right longitudinal section line is located at a distance of -10650mm from the origin along the Y-axis; in step S1, both the left and right closure rib inspection lines are located at a distance of 114900mm from the origin along the X-axis; in step S2, the left stop line is located at a distance of 19850mm from the origin along the Y-axis, and the right stop line is located at a distance of -8150mm from the origin along the Y-axis.

[0008] Preferably, in step S1, horizontal reference marks are marked at the four corner hard-stop structures of the deck surface of the left and right merging sections. The horizontal reference marks are set along the Z-axis direction and serve as the control reference for the height positioning and level adjustment of the ship sections.

[0009] Preferably, in step S7, after the left merging section is transported to its position, the horizontality of the left merging section is adjusted to a deviation of no more than 3mm based on the horizontal reference mark of the left merging section, and then temporary fixing is completed; in step S8, after the right merging section is transported to the floating platform, the left longitudinal section line, left merging rib inspection line and horizontal reference mark of the temporarily fixed left merging section are used as a unified reference to complete the alignment of horizontality, width direction and length direction in sequence.

[0010] Preferably, in step S4, during the closing simulation, the width direction is matched according to the measured reference data of the floating platform, and the bow and stern directions are based on the shortest structural point of the closing joint of the ship section to allocate the trimming allowance, ensuring that the left closing end and the right closing end face after cutting and correction are the same vertical plane.

[0011] Preferably, in step S5, the fixed spacing between the left inspection line and the left cutting line, and the fixed spacing between the right inspection line and the right cutting line are both 200mm; the scribing accuracy tolerance of the left cutting line, the right cutting line, the left inspection line, and the right inspection line is controlled within ±1mm.

[0012] Preferably, between steps S6 and S7, after the cutting correction is completed, the actual distance between the left inspection line and the left closing end and the actual distance between the right inspection line and the right closing end are measured to pre-simulate the gap state after the two sections are closed, and the positions where the gap exceeds the tolerance are repaired and corrected until the closing accuracy requirements are met.

[0013] Preferably, before step S6 is executed, the interlocking structures at the closure joints of the left and right closure sections are removed in advance.

[0014] Preferably, in steps S7 and S8, the total section transfer is completed using modular vehicles; before the transfer, the travel lines of the left modular vehicle that coincide with the left longitudinal section line and the travel lines of the right modular vehicle that coincide with the right longitudinal section line are planned respectively; during the transfer, the travel route of the modular vehicle is calibrated in real time along the corresponding longitudinal section line by using a plumb bob.

[0015] The method for assembling ship sections based on a floating platform provided by this invention has the following advantages: 1. By constructing a unified hull coordinate system, the left longitudinal section and the right longitudinal section correspond to the left stop line and the right stop line respectively, and the left rib inspection line and the right rib inspection line correspond to the rib inspection stop line, thereby achieving position matching between the ship section and the floating platform. 2. By simulating the closing process, the gap or intersection state after closing can be confirmed in advance, and then subsequent trimming can be carried out to achieve zero interference in the actual closing process. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the method for assembling ship sections based on a floating platform according to an embodiment of the present invention. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0019] In the description of this invention, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] Reference Figure 1 An embodiment of the present invention provides a method for assembling ship sections based on a floating platform, comprising the following steps: Step S1: Based on the unified hull coordinate system of the ship design, mark the left longitudinal section and the left hull inspection line on the left merging section, and mark the right longitudinal section and the right hull inspection line on the right merging section. Step S2: Based on the same hull coordinate system of Step S1 and the actual dimensions of the assembled hull, mark the left stop line corresponding to the left longitudinal section line, the right stop line corresponding to the right longitudinal section line, and the rib inspection stop line corresponding to both the left and right rib inspection lines on the floating platform. Step S3: Perform three-dimensional measurements and model the left and right closure segments; Step S4: Based on the same hull coordinate system of Step S1, combine the measured reference data of the floating platform with the overall model in Step S3 to perform a merging simulation. The left longitudinal section line coincides with the left stop line, the right longitudinal section line coincides with the right stop line, and the left merging rib inspection line and the right merging rib inspection line both coincide with the rib inspection stop line. Step S5: Based on the closure simulation results of Step S4, mark the left cutting line and the left inspection line parallel to the left closure section with a fixed spacing on the left closure section; mark the right cutting line and the right inspection line parallel to the right cutting line with a fixed spacing on the right closure section. Step S6: Cut and correct the left merging segment according to the left cutting line drawn in step S5 to construct the left merging end. Cut and correct the right merging segment according to the right cutting line drawn in step S5 to construct the right merging end. Step S7: Transfer the left closure section to the floating platform, so that the left longitudinal section line coincides with the left stop line and the left closure rib inspection line coincides with the rib inspection stop line, thus completing the temporary fixation of the left closure section. Step S8: Using the temporarily fixed left longitudinal section and left rib inspection line of the left closure section as a unified reference, transfer the right closure section to the floating platform to complete the alignment, so that the right longitudinal section coincides with the right stop line and the right rib inspection line coincides with the rib inspection stop line. Step S9: Complete the joining and docking of the left and right merging ends to form the ship section.

[0022] In step S1, by surveying and marking baselines based on the same design coordinate system on two independent sections to be joined (left and right joining sections), the positioning references of the left and right joining sections are anchored to the same reference system, providing accurate reference anchor points for subsequent platform reference surveying, joining simulation, and alignment adjustment. Specifically, the theoretical coordinates of the baselines of the left and right joining sections are determined based solely on the unified hull coordinate system of the ship design drawings, and the left longitudinal section line and left joining rib inspection line, as well as the right longitudinal section line and right joining rib inspection line, are surveyed and marked on the left and right joining sections respectively.

[0023] In step S2, in conjunction with step S1, ensure that the left and right merging sections are completely aligned with the reference of the floating platform, providing an intuitive initial positioning reference for the connection of the left and right merging sections. Furthermore, in steps S3 to S4, three-dimensional measurements are performed on the left and right closure sections, and models are created to pre-plan the closure joints of the two sections. Simultaneously, the measured data of each baseline of the left and right closure sections are obtained; thus, the preliminary execution of "measurement before construction and prediction before rectification" is realized.

[0024] In step S5, combining the three-dimensional data obtained in steps S3 and S4, the closure rib inspection lines already marked on the left and right closure sections are used as field references. The trimming allowance determined by the closure simulation is converted into coordinate points on the entity, and the points are connected to form continuous left and right cutting lines. Simultaneously, left and right inspection lines parallel to the left and right cutting lines with fixed spacing are marked. In step S6, based on the specific data obtained in steps S3 to S5, the left and right merging ends are trimmed during the actual construction phase to ensure the flatness and verticality of the left and right merging ends of the left and right merging sections. This fundamentally eliminates the interference risk generated during the merging process of the left and right merging sections, greatly improves the efficiency of merging on the floating platform, and enhances construction safety.

[0025] After completing the preliminary survey and simulation in steps S1 to S6, steps S7 and S8 are then performed. In steps S7 and S8, the left main section is transferred to the floating platform, and initial positioning is completed based on the fixed baseline of the platform. Then, temporary fixing is performed to rigidly bind the left main section to the floating platform as one unit, which serves as the only fixed reference for the subsequent alignment of the right main section. This solves the problem of unstable and drifting references when the floating platform is in a floating state, avoids reference confusion caused by simultaneous adjustment of the left and right merging main sections, greatly reduces the difficulty of subsequent alignment adjustments, and improves alignment efficiency.

[0026] In step S9, the gap, flatness and alignment accuracy of the closure joint need to be checked to confirm that there is no risk of interference before the temporary docking and fixing of the closure joint is completed; the left and right closure sections are closed in one go with zero interference, and the closure accuracy fully meets the construction design requirements of large ships, forming a complete ship section.

[0027] As can be seen from the above, the method for assembling ship sections based on a floating platform of the present invention has the following advantages: 1. By constructing a unified hull coordinate system, the left longitudinal section and the right longitudinal section correspond to the left stop line and the right stop line respectively, and the left rib inspection line and the right rib inspection line correspond to the rib inspection stop line, thereby achieving position matching between the ship section and the floating platform. 2. By simulating the closing process, the gap or intersection state after closing can be confirmed in advance, and then subsequent trimming can be carried out to achieve zero interference in the actual closing process.

[0028] Preferably, in steps S1 to S9, the unified hull coordinate system consists of intersecting X-axis, Y-axis and Z-axis, wherein the X-axis is the length direction of the ship section from bow to stern, the Y-axis is the width direction of the ship section from one side to the other, and the Z-axis is the height direction of the ship section. The X-axis, Y-axis and Z-axis intersect at the origin of the unified hull coordinate system.

[0029] In some embodiments, in step S1, the left longitudinal section line is located at a distance of 17350mm from the origin along the Y-axis, and the right longitudinal section line is located at a distance of -10650mm from the origin along the Y-axis; in step S1, both the left and right closure rib inspection lines are located at a distance of 114900mm from the origin along the X-axis; in step S2, the left stop line is located at a distance of 19850mm from the origin along the Y-axis, and the right stop line is located at a distance of -8150mm from the origin along the Y-axis.

[0030] In actual construction, the merging of ship sections requires not only precise planar positioning but also levelness control. If a section tilts, even if the planar references coincide, the merging end face will still exhibit distortion and misalignment. Therefore, in step S1, horizontal reference marks are marked at the four corners of the deck surface of both the left and right merging sections. These marks are set along the Z-axis and serve as control references for the height positioning and levelness adjustment of the ship sections. This supplements the control references for height and levelness, achieving full-dimensional precision control in three-dimensional space. This avoids distortion and misalignment of the merging end face caused by section tilting. Furthermore, it is compatible with both total station non-contact measurement and manual plumb line verification, balancing measurement accuracy and construction convenience.

[0031] In some embodiments, in step S7, after the left merging section is transported to its position, the horizontality of the left merging section is adjusted to a deviation of no more than 3mm based on the horizontal reference mark of the left merging section, and then temporary fixing is completed. In step S8, after the right merging section is transported to the floating platform, the left longitudinal section line, left merging rib inspection line, and horizontal reference mark of the temporarily fixed left merging section are used as unified references to sequentially complete the alignment in the horizontal, width, and length directions. This ensures the verticality and flatness of the merging end faces of the ship sections, avoids problems such as misalignment of the merging joint and uneven welding gaps, significantly improves alignment efficiency and accuracy, and reduces on-site construction difficulty.

[0032] In some embodiments, during the closing simulation in step S4, the width direction is matched according to the measured reference data of the floating platform, and the bow and stern directions are allocated with the shortest structural point of the closing joint of the ship section as the reference, ensuring that the left and right closing end faces after cutting and correction are on the same vertical plane. This eliminates the risk of closing interference, ensures that the closing end faces are completely fitted, provides a good foundation for subsequent welding operations, and improves the welding quality of the hull structure.

[0033] In some embodiments, in step S5, the fixed spacing between the left inspection line and the left cutting line, and the fixed spacing between the right inspection line and the right cutting line are both 200mm; the scribing accuracy tolerance of the left cutting line, right cutting line, left inspection line, and right inspection line is controlled within ±1mm. This provides ample operating space for measurement and verification, improving the convenience and accuracy of on-site measurement; it effectively controls the basic error of the closure port trimming, ensuring the controllability of subsequent cutting accuracy and closure gap.

[0034] In some embodiments, between steps S6 and S7, after the cutting correction is completed, the actual distance between the left inspection line and the left merging end, and the actual distance between the right inspection line and the right merging end are measured to pre-simulate the gap state after the two sections are joined. Any gaps exceeding tolerance are then corrected through secondary cutting until the merging accuracy requirements are met. This achieves pre-merging simulation verification on land, identifying and correcting out-of-tolerance areas in advance, completely avoiding rework on the floating platform, and significantly improving merging efficiency. Quantitative calculation of the merging gap completely avoids uneven gaps and interference problems.

[0035] Furthermore, before step S6 is executed, the interlocking structures at the closure joints of the left and right closure sections are removed in advance. This eliminates the risk of interference during the closure process, ensuring that the main structure can be aligned in one go, achieving zero-interference closure; the removal work is completed in advance on land, avoiding high-altitude removal work on the floating platform, improving construction safety, reducing obstacles during the closure alignment process, and significantly shortening the alignment adjustment time.

[0036] In some embodiments, in steps S7 and S8, the total section transfer is completed using modular vehicles; before the transfer, the travel lines of the left modular vehicle that coincide with the left longitudinal section line and the travel lines of the right modular vehicle that coincide with the right longitudinal section line are planned respectively; during the transfer, the travel route of the modular vehicle is calibrated in real time along the corresponding longitudinal section line by using a plumb bob.

[0037] Those skilled in the art can make several improvements and substitutions without departing from the technical principles of this invention, and these improvements and substitutions should also be considered within the scope of protection of this invention.

Claims

1. A method of closing a ship section based on a floating platform, characterized in that, Includes the following steps: Step S1: Mark the left longitudinal section line and the left closure rib inspection line on the left closure section, and mark the right longitudinal section line and the right closure rib inspection line on the right closure section. Step S2: Mark the left stop line, right stop line, and rib inspection stop line on the floating platform; Step S3: Perform 3D modeling of the left and right closure segments; Step S4: Combine the measured benchmark data of the floating platform with the overall segment model in Step S3 to perform a closing simulation, wherein the left longitudinal section line coincides with the left stop line, the right longitudinal section line coincides with the right stop line, and the left closing rib inspection line and the right closing rib inspection line both coincide with the rib inspection stop line. Step S5: Based on the closure simulation results of Step S4, mark the left cutting line and the left inspection line parallel to the left closure section with a fixed spacing on the left closure section; mark the right cutting line and the right inspection line parallel to the right cutting line with a fixed spacing on the right closure section. Step S6: Cut and correct the left and right merging segments to construct the left and right merging ends; Step S7: Transfer the left closure section to the floating platform so that the left longitudinal section line coincides with the left stop line and the left closure rib inspection line coincides with the rib inspection stop line; Step S8: Using the left longitudinal section and the left rib inspection line of the left merging section as a reference, transfer the right merging section to the floating platform to complete the alignment. Step S9: Combine the left and right merging ends to form the ship section; In step S4, during the closing simulation, the width direction is matched according to the measured reference data of the floating platform, and the bow and stern directions are based on the shortest structural point of the closing joint of the ship section to allocate the trimming allowance, ensuring that the left closing end and the right closing end face after cutting and correction are the same vertical plane. Between steps S6 and S7, after the cutting correction is completed, the actual distance between the left inspection line and the left closing end and the actual distance between the right inspection line and the right closing end are measured to pre-simulate the gap state after the two sections are closed. The positions where the gap exceeds the tolerance are then cut and corrected again until the closing accuracy requirements are met. In steps S7 and S8, the total section transfer is completed using modular vehicles. Before the transfer, the travel lines of the left modular vehicle that coincide with the left longitudinal section line and the travel lines of the right modular vehicle that coincide with the right longitudinal section line are planned respectively. During the transfer, the travel route of the modular vehicle is calibrated in real time along the corresponding longitudinal section line by using a plumb bob.

2. A method of joining together sections of a floating platform based vessel as claimed in claim 1, wherein, In steps S1 to S9, the unified hull coordinate system consists of intersecting X-axis, Y-axis and Z-axis. The X-axis is the length direction of the ship section from bow to stern, the Y-axis is the width direction of the ship section from one side to the other, and the Z-axis is the height direction of the ship section. The X-axis, Y-axis and Z-axis intersect at the origin of the unified hull coordinate system.

3. The method for assembling ship sections based on a floating platform according to claim 2, characterized in that, In step S1, the left longitudinal section is located at a distance of 17350mm from the origin along the Y-axis, and the right longitudinal section is located at a distance of -10650mm from the origin along the Y-axis. In step S1, both the left and right closing rib inspection lines are located at a distance of 114900 mm from the origin along the X-axis. In step S2, the left stop line is located 19850mm from the origin along the Y-axis, and the right stop line is located -8150mm from the origin along the Y-axis.

4. The method of claim 2, wherein, In step S1, horizontal reference marks are marked at the four corner hard-stop structures of the deck surface of the left and right merging sections. The horizontal reference marks are set along the Z-axis direction and serve as the control reference for the height positioning and level adjustment of the ship sections.

5. A method of joining together sections of a floating platform based vessel as claimed in claim 4, wherein, In step S7, after the left merging section is transported to its position, the horizontality of the left merging section is adjusted to a deviation of no more than 3mm based on the horizontal reference mark of the left merging section, and then temporary fixing is completed; in step S8, after the right merging section is transported to the floating platform, the left longitudinal section line, left merging rib inspection line and horizontal reference mark of the temporarily fixed left merging section are used as a unified reference to complete the alignment of horizontality, width direction and length direction in sequence.

6. The floating platform based ship section joining method of claim 1, wherein, In step S5, the fixed spacing between the left inspection line and the left cutting line, and the fixed spacing between the right inspection line and the right cutting line are both 200mm; the scribing accuracy tolerance of the left cutting line, the right cutting line, the left inspection line, and the right inspection line is controlled within ±1mm.

7. The floating platform based ship section joining method of claim 1, wherein, Before step S6 is executed, the interlocking structures at the closure joints of the left and right closure sections are removed in advance.

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