A method for unified reference point control accuracy of large ships

Abstract

The present invention discloses a method for controlling the accuracy of unified reference points of large ships, including the following steps: establishing theoretical models of each section, the whole section and the whole ship. Prefabricating the ship sections; completing the production of all sections and collecting the actual three-dimensional coordinates of all sections. Comparing the collected actual three-dimensional coordinates of the sections with the three-dimensional coordinates of the theoretical model, and performing secondary processing on the sections; completing the overall assembly of the sections; making the theoretical center line of the whole ship consistent with the center line of the dock; finding the intersection of the theoretical stern vertical line of the whole ship, the theoretical center line and the horizontal plane of the bottom of the hull through a total station, and setting this point as the unified reference point of the whole ship; determining the starting whole section and accurately positioning it; building an annular hull with the starting whole section as the starting point; building an annular hull in the bow and stern directions in sequence with the completed annular hull as the starting point, and finally completing the production of the hull. The use of this method improves the mounting accuracy and construction quality, and reduces the construction difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a method for controlling the precision of unified reference points of large ships. Background Art

[0002] Existing ship loading precision control technology only considers the loading clearance and port parallelism between segments during segment assembly. This results in the accumulation of precision deviations on the outer contour of the final segment, forcing the segments to be recut to correct for these deviations before they are assembled. Furthermore, existing ship loading precision control technology lacks a unified reference point, requiring significant time to determine the loading positioning accuracy of each segment. Furthermore, after the segments are welded together, secondary cutting is required due to positioning deviations.

[0003] The existing technology has a long construction period, poor loading accuracy, serious problem of excessive gaps between sections, and a large amount of secondary correction work, which results in poor overall construction quality of the ship, low construction effect, and increased labor intensity for workers. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and provide a method for controlling the precision of unified reference points on large ships, thereby improving the mounting precision and construction quality and reducing the difficulty of construction.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for controlling the accuracy of unified reference points of large ships comprises the following steps:

[0007] Step 1: Establish theoretical models of each section, the entire section, and the entire ship according to the detailed structural design drawings, and prefabricate the ship sections according to the theoretical models of each section;

[0008] Step 2: After all segments are created, use a total station to perform precision scanning on the data collection points corresponding to all segments, and collect the actual three-dimensional coordinates of all segments;

[0009] Step 3: Compare the actual 3D coordinates of all segments collected with the 3D coordinates of the theoretical model. Perform secondary processing on segments whose actual 3D coordinates exceed the theoretical model. Cut the excess part to make the finished size of the segment as consistent as possible with the theoretical model. Record and circulate any inconsistent locations.

[0010] Step 4: Using the theoretical model of the total segment, the segments are precisely positioned using a total station so that the actual outer contour of each segment is consistent with the theoretical outer contour, completing the overall assembly of the segments.

[0011] Step 5: Before the whole section is hoisted onto the dock, the center line of the dock is marked on the dock with a laser theodolite, and the theoretical three-dimensional coordinates of the entire ship on the dock are determined using a total station, and the theoretical center line of the entire ship is aligned with the center line of the dock;

[0012] Step 6: Use a total station to find the intersection of the theoretical stern perpendicular line, the theoretical center line, and the horizontal plane of the hull bottom, and set this point as the unified reference point for the entire ship;

[0013] Step 7: Select one of the double-bottom sections at the stern of the ship as the starting section, hoist the starting section onto the dock, and accurately locate the starting section using a total station with reference to a unified reference point.

[0014] Step 8: Starting from the starting block, hoist the blocks adjacent to the starting block along the width of the ship, accurately position the blocks adjacent to the starting block, and weld them together with the starting block after accurate positioning. Starting from the double bottom and extending to both sides, and finally to the top of the hull, accurately position the remaining blocks in turn, and weld them together to form a ring-shaped hull;

[0015] Step 9: Starting from the completed annular hull, the annular hull is constructed in sequence toward the bow and stern, and finally the entire hull is completed.

[0016] Preferably, the segmented grouping operation in step 4 includes the following steps:

[0017] Step 401: Using the overall segment model as a reference, set reference points on the segment models that form the overall segment outer contour line. Each segment is set with three reference points that represent theoretical X, Y, and Z three-dimensional coordinates.

[0018] Step 402: Find the data collection points corresponding to the theoretical X, Y, and Z three-dimensional coordinates of each segment and place cursor paper on the data collection points;

[0019] Step 403: hoist the segments to the corresponding positions according to the requirements of the overall group;

[0020] Step 404: Use a total station to scan the data collection points of each segment in sequence to collect the actual X, Y, and Z three-dimensional coordinates of all segments;

[0021] Step 405: Adjust the position of each segment so that the actual X, Y, and Z coordinates of each segment correspond to the theoretical X, Y, and Z coordinates, ensuring that the outer contour of the actual overall segment coincides with the outer contour of the theoretical overall segment.

[0022] Step 406: cutting the closing openings of each segment to make them parallel to each other, assembling an arc striking and extinguishing plate between the two closing openings, and welding the two adjacent segments to finally complete the overall assembly of the segments.

[0023] Preferably, the precise positioning of the starting total segment in step 7 includes the following steps:

[0024] Step 701: Find the starting section in the full ship model, set three reference points on the starting section to represent the theoretical x, y, and z three-dimensional coordinates, and calculate the distances between the three reference points and the unified reference point.

[0025] Step 702: hoist the starting block to the dock, find three data collection points on the starting block that correspond to the theoretical x, y, and z three-dimensional coordinates, and attach cursor paper to the data collection points;

[0026] Step 703: Use a total station to scan the data collection points of the starting segment, collect the actual x, y, and z three-dimensional coordinates of the starting segment, and calculate the distances between the three data collection points and the unified reference point.

[0027] Step 704 , by comparing the distances between the three reference points and the unified reference point with the distances between the three data collection points and the unified reference point, the distance that the starting segment needs to be adjusted and moved is calculated within a range that does not affect the subsequent segment loading;

[0028] Step 705 : Further adjust the position of the starting total segment according to the distance calculated in step 704 to complete the precise positioning of the starting total segment.

[0029] Preferably, the steps of precisely positioning the segments adjacent to the starting segment and the remaining segments in step 8 are consistent with the steps of precisely positioning the starting segment.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. When assembling the segments, a simulated loading method is used to make the actual outer contour of each segment consistent with the theoretical outer contour. Before the segments are combined, there is no need to cut the outer contour of the segments.

[0032] 2. During the loading process between sections, a unified reference point is used to ensure that each section of the hull can be positioned without deviation, solving the problem of serious gap deviation between sections, improving positioning accuracy, avoiding secondary corrections after the sections are put together, and ensuring the construction quality of the ship.

[0033] 3. Secondary correction requires re-erecting scaffolding and placing cutting equipment, which increases the difficulty of construction and increases the operating risks of workers. With this method, there is no need for secondary correction, which reduces the difficulty of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the annular hull of the present invention;

[0035] Figure 2 This is the installation diagram for the segmented assembly;

[0036] Among them, 1-double bottom section, 2-hopper tank section, 3-top tank section, 4-reference point DETAILED DESCRIPTION

[0037] The present invention is further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0038] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", and "top" are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0039] like Figures 1 to 2 As shown, a method for controlling the accuracy of unified reference points of large ships includes the following steps:

[0040] Step 1: Establish theoretical models of each section, the entire section, and the entire ship according to the detailed structural design drawings, and prefabricate the ship sections according to the theoretical models of each section;

[0041] Step 2: After all segments are created, use a total station to perform precision scanning on the data collection points corresponding to all segments, and collect the actual three-dimensional coordinates of all segments;

[0042] Step 3: Compare the actual 3D coordinates of all segments collected with the 3D coordinates of the theoretical model. Perform secondary processing on segments whose actual 3D coordinates exceed the theoretical model. Cut the excess part to make the finished size of the segment as consistent as possible with the theoretical model. Record and circulate any inconsistent locations.

[0043] Step 4: Using the theoretical model of the total segment, the segments are precisely positioned by a total station so that the actual outer contour of each segment is consistent with the theoretical outer contour, completing the total grouping of the segments. The total grouping operation includes the following steps:

[0044] Step 401: Using the overall segment model as a reference, set reference points 4 on the segment models that form the overall segment outer contour. Each segment is set with three reference points that represent theoretical X, Y, and Z three-dimensional coordinates.

[0045] Step 402: Find the data collection points corresponding to the theoretical X, Y, and Z three-dimensional coordinates of each segment and place cursor paper on the data collection points;

[0046] Step 403: hoist the segments to the corresponding positions according to the requirements of the overall group;

[0047] Step 404: Use a total station to scan the data collection points of each segment in sequence to collect the actual X, Y, and Z three-dimensional coordinates of all segments;

[0048] Step 405: Adjust the position of each segment so that the actual X, Y, and Z coordinates of each segment correspond to the theoretical X, Y, and Z coordinates, ensuring that the outer contour of the actual overall segment coincides with the outer contour of the theoretical overall segment.

[0049] Step 406: Cut the closing mouths of each segment to make them parallel to each other, install the arc-ignition plate between the two closing mouths, and weld the two adjacent segments to complete the segment assembly.

[0050] Step 5: Before the whole section is hoisted onto the dock, the center line of the dock is marked on the dock with a laser theodolite, and the theoretical three-dimensional coordinates of the entire ship on the dock are determined using a total station, and the theoretical center line of the entire ship is aligned with the center line of the dock;

[0051] Step 6: Use a total station to find the intersection of the theoretical stern perpendicular line, the theoretical center line, and the horizontal plane of the hull bottom, and set this point as the unified reference point for the entire ship;

[0052] Step 7: Select one of the double-bottom sections at the stern of the ship as the starting section, hoist the starting section onto the dock, and accurately position the starting section using a total station with reference to a unified reference point. The accurate positioning of the starting section includes the following steps:

[0053] Step 701: Find the starting section in the full ship model, set three reference points on the starting section to represent the theoretical x, y, and z three-dimensional coordinates, and calculate the distances between the three reference points and the unified reference point.

[0054] Step 702: hoist the starting block to the dock, find three data collection points on the starting block that correspond to the theoretical x, y, and z three-dimensional coordinates, and attach cursor paper to the data collection points;

[0055] Step 703: Use a total station to scan the data collection points of the starting segment, collect the actual x, y, and z three-dimensional coordinates of the starting segment, and calculate the distances between the three data collection points and the unified reference point.

[0056] Step 704 , by comparing the distances between the three reference points and the unified reference point with the distances between the three data collection points and the unified reference point, the distance that the starting segment needs to be adjusted and moved is calculated within a range that does not affect the subsequent segment loading;

[0057] Step 705: further adjust the position of the starting segment according to the distance calculated in step 704 to complete the precise positioning of the starting segment.

[0058] Step 8: Starting from the starting block, hoist the blocks adjacent to the starting block along the ship width direction, and accurately position the blocks adjacent to the starting block. The method for accurately positioning the blocks is the same as that for accurately positioning the starting block. After accurate positioning is completed, weld and close them together with the starting block. Using the same accurate positioning method, continue to weld and close other blocks towards both ends in the ship width direction, from the double bottom block 1 to the hopper tank blocks 2 on both sides, and finally extend to the topside tank block 3 of the hull. If there is a transverse bulkhead between the hopper tank blocks on both sides, install the transverse bulkhead first, and then install the topside tank block. If there is no transverse bulkhead between the hopper tank blocks on both sides, directly install the topside tank block and weld and close them to form a ring-shaped hull.

[0059] Step 9: Hoist the sections adjacent to the starting section along the length of the ship, repeat the method of building the annular hull in step 8, and use the completed annular hull as the starting point to build the annular hull in the bow and stern directions respectively, and finally complete the production of the entire hull.

[0060] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept described herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A method for unifying the reference point control accuracy of large ships, characterized by: The following steps are involved: Step 1: Establish theoretical models of each section, the entire section, and the entire ship according to the detailed structural design drawings, and prefabricate the ship sections according to the theoretical models of each section; Step 2: After all segments are created, use a total station to perform precision scanning on the data collection points corresponding to all segments, and collect the actual three-dimensional coordinates of all segments; Step 3: Compare the actual 3D coordinates of all segments collected with the 3D coordinates of the theoretical model. Perform secondary processing on segments whose actual 3D coordinates exceed the theoretical model. Cut the excess part to make the finished size of the segment as consistent as possible with the theoretical model. Record and circulate any inconsistent locations. Step 4: Using the theoretical model of the total segment, the segments are precisely positioned using a total station so that the actual outer contour of each segment is consistent with the theoretical outer contour, completing the overall assembly of the segments. Step 5: Before the main section is hoisted into the dock, the center line of the dock is marked on the dock with a laser theodolite, and the theoretical three-dimensional coordinates of the entire ship on the dock are determined using a total station, and the theoretical center line of the entire ship is aligned with the center line of the dock; Step 6: Use a total station to find the intersection of the theoretical stern perpendicular line, the theoretical center line, and the horizontal plane of the hull bottom, and set this point as the unified reference point for the entire ship; Step 7: Select one of the double-bottom sections at the stern of the ship as the starting section, hoist the starting section onto the dock, and accurately locate the starting section using a total station with reference to a unified reference point. Step 8: Starting from the starting block, hoist the blocks adjacent to the starting block along the width of the ship, accurately position the blocks adjacent to the starting block, and weld them together with the starting block after accurate positioning. Starting from the double bottom and extending to both sides, and finally to the top of the hull, accurately position the remaining blocks in turn, and weld them together to form a ring-shaped hull; Step 9: Starting from the completed annular hull, the annular hull is constructed in sequence toward the bow and stern, and finally the entire hull is completed.

2. A method for controlling the accuracy of unified reference points of large ships according to claim 1, characterized in that: The segmented grouping operation in step 4 includes the following steps: Step 401: Using the overall segment model as a reference, set reference points on the segment models that form the overall segment outer contour line. Each segment is set with three reference points that represent theoretical X, Y, and Z three-dimensional coordinates. Step 402: Find the data collection points corresponding to the theoretical X, Y, and Z three-dimensional coordinates of each segment and place cursor paper on the data collection points; Step 403: hoist the segments to the corresponding positions according to the requirements of the overall group; Step 404: Use a total station to scan the data collection points of each segment in sequence to collect the actual X, Y, and Z three-dimensional coordinates of all segments; Step 405: Adjust the position of each segment so that the actual X, Y, and Z coordinates of each segment correspond to the theoretical X, Y, and Z coordinates, ensuring that the outer contour of the actual overall segment coincides with the outer contour of the theoretical overall segment. Step 406: cutting the closing openings of each segment to make them parallel to each other, assembling an arc striking and extinguishing plate between the two closing openings, and welding the two adjacent segments to finally complete the overall assembly of the segments.

3. The method for controlling the accuracy of unified reference points of large ships according to claim 1, characterized in that: The precise positioning of the starting block in step 7 includes the following steps: Step 701, finding the starting block in the full ship model, setting three reference points on the starting block to represent theoretical x, y, and z three-dimensional coordinates, and calculating the distances between the three reference points and the unified reference point; Step 702: hoist the starting block to the dock, find three data collection points on the starting block that correspond to the theoretical x, y, and z three-dimensional coordinates, and attach cursor paper to the data collection points; Step 703: Use a total station to scan the data collection points of the starting segment, collect the actual x, y, and z three-dimensional coordinates of the starting segment, and calculate the distances between the three data collection points and the unified reference point. Step 704 , by comparing the distances between the three reference points and the unified reference point with the distances between the three data collection points and the unified reference point, the distance that the starting segment needs to be adjusted and moved is calculated within a range that does not affect the subsequent segment loading; Step 705 : Further adjust the position of the starting total segment according to the distance calculated in step 704 to complete the precise positioning of the starting total segment.

4. A method for controlling the accuracy of unified reference points of large ships according to claim 3, characterized in that: In step 8, the steps for accurately positioning the segments adjacent to the starting segment and the remaining segments are the same as those for accurately positioning the starting segment.

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