Container ship box testing precision control method

Abstract

The invention provides a container testing precision control method for a container ship. The container testing precision control method specifically comprises the following steps that S1, guide rail assembly prefabrication precision control is carried out; s2, prefabricating a transverse bulkhead and a hatch transverse coaming and performing precision control on guide rail preassembling; s3, controlling the positioning precision of a transverse bulkhead and a guide rail in a closure stage; and S4, carrying out three-dimensional digital simulation box testing on the whole cabin by adopting a Leica P40 three-dimensional scanner. According to the container ship test box precision control method provided by the invention, process control is carried out through system size chain data in the whole process of container ship guide rail prefabrication, segmented construction and folding and carrying, matching simulation of the standard container size and the container space is carried out, and a traditional process simulation test box installation method is replaced by container verification; and the process operability is good, and the boxing installation precision can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a container ship test box accuracy control method. Background Art

[0002] After the construction of a container ship is completed, a lifting test of the container in the large cabin is required to verify whether the guide rail spacing and the bottom cone position meet the lifting accuracy requirements. The traditional method is to simulate the lifting test. If the container gets stuck or cannot be smoothly inserted into the bottom cone during the test, it will cause a lot of rework and correction at the construction site to ensure the overall accuracy of the guide rail spacing and the bottom cone position of a ship. At the same time, a lot of rework on site not only increases construction costs, but also affects the entire dock and terminal test cycle. Summary of the invention

[0003] In view of the above problems, the present invention provides a method for controlling the accuracy of container ship test boxes. Through the system dimension chain data of the whole process from container ship guide rail prefabrication, segmented construction to closing and loading, process control is carried out, and the matching simulation of standard container size and container space is carried out. Container space verification is realized to replace the traditional process simulation test box installation method. It has good process operability and can greatly improve the loading and installation accuracy.

[0004] To achieve the above purpose, the present invention mainly adopts the following technical solutions:

[0005] A container ship test box accuracy control method, characterized in that it specifically includes the following steps:

[0006] S1. Precision control of guide rail group prefabrication;

[0007] S2. Precision control of transverse bulkheads, hatch transverse coaming prefabrication and guide rail preinstallation;

[0008] S3. Precision control of transverse bulkhead and guide rail positioning during the closing phase;

[0009] S4. Use Leica P40 3D scanner to conduct 3D digital simulation test of the whole ship cabin.

[0010] Furthermore, the S1 specifically includes the following steps:

[0011] S11. Before making the guide rail, the level of the tire frame and the straightness of the pallet should be controlled and checked, and the construction can be carried out only after the accuracy requirement of ±1mm is met;

[0012] S12. Prefabrication of guide rails;

[0013] S13. After the guide rail is manufactured, the guide rail straightness is checked by wire drawing method to meet the guide rail straightness standard of ±2mm.

[0014] Furthermore, the S2 specifically includes the following steps:

[0015] S21. Prefabrication of transverse bulkheads: Before the construction of transverse bulkheads, a positioning ground line shall be made on site. When locating the main plate or platform, the positioning shall be carried out by setting out in a 1:1 ratio with reference to the ground line;

[0016] S22. Precision control and pre-installation of hatch transverse coaming: When constructing the hatch transverse coaming, the horizontal accuracy of the top plate is controlled within ±2mm. After the top plate of the hatch transverse coaming reaches the required level, it is assembled with the transverse bulkhead structure, and the positioning accuracy of the hatch transverse coaming is tracked and controlled;

[0017] S23. Make the guide rail pre-installation reference line: refer to the three-dimensional data of the transverse bulkhead structure, determine the guide rail pre-installation reference line on site, and make the guide rail pre-installation reference line coincide with the transverse bulkhead structure; after the reference line on one side of the transverse bulkhead is made, it is reversed to the other side of the transverse bulkhead, and the guide rail pre-installation reference lines on both sides of the transverse bulkhead are unified;

[0018] S24. Pre-installation of guide rails on one side of transverse bulkhead: pre-install the guide rail at the middle joint first as the first guide rail. After checking the height, half-width and horizontal dimensions of the first guide rail to be qualified, pre-install the remaining guide rails on one side of transverse bulkhead based on the half-width of the first guide rail. After the guide rails are pre-installed, welding is carried out. Before and after welding, the pre-installation of the guide rails is checked according to the standards of guide rail gap +1mm, horizontal -3ˋ+1mm, and inverted cap extending 20mm from the cabin coaming top plate;

[0019] S25. Pre-installation of guide rails on the other side of the transverse bulkhead: turn over the transverse bulkhead and place it on a bracket or a flower stand, then use the previously reversed reference line as the reference to lay out and pre-install the guide rails on that side. After the rails are pre-installed, weld them. Before and after welding, check the pre-installation of the guide rails according to the standards.

[0020] Furthermore, the S3 specifically includes the following steps:

[0021] S31. Based on the precision control and inspection data of transverse bulkheads, guide rails and hatch transverse coaming top plates in the segmented stage, the dimensional relationship between the cargo hold capacity and container space is controlled as a whole before closing and loading. Based on the dimensional chain of cargo hold cones and guide rails, an overall closing control plan is formulated, namely

[0022] Formulate cargo hold dimension chain loading plan and provide positioning control principles for cargo hold height, half width, front and back;

[0023] S32. Sectional closing of double bottom, hopper tank, transverse bulkhead and upper wing tank in cargo hold area: Carry out in accordance with the requirements of the formulated overall closing control plan, and strictly control the positioning accuracy of the sections in the cargo hold area; according to the pre-installed state of the guide rails at the sectioning stage and the three-dimensional completion accuracy dimension data of the double bottom, hopper tank, transverse bulkhead and upper wing tank sections and the guide rails after welding, simulate the loading of all sections in advance according to the requirements of the cargo hold dimension chain, and sort out the best closing positioning plan for each section, that is, the positioning height, half width, front and rear dimensions of the double bottom, hopper tank, transverse bulkhead and upper wing tank sections in the cargo hold area;

[0024] S33. Before the middle closing of the transverse bulkhead sections, simulation analysis of the closing of the port and starboard transverse bulkheads shall be conducted based on the overall three-dimensional dimension data of the guide rail pre-installed on the transverse bulkhead after completion, and the butt joint clearance of the transverse bulkheads and the opening size of the guide rails at the closing opening shall be analyzed. The butt joint clearance shall be ≤16mm, and the guide rail clearance shall meet the requirements of +3 to +8mm. During the on-site positioning stage of the middle closing of the transverse bulkhead sections, the closing height reference of the transverse bulkhead sections shall be used to control the horizontal level of the transverse hatch coaming to be ±3mm, and the opening size of the guide rails at the closing opening shall meet the requirements of +3 to +8mm.

[0025] S34. After the transverse bulkheads are closed together, they form large groups of sections. Before positioning the large groups of sections, a positioning plan corresponding to each group of transverse bulkheads shall be formulated according to the cabin capacity formed by each cabin; on site, the positioning height, front and rear verticality and center position requirements of each group of transverse bulkheads shall be ensured to be consistent with the center of the inner bottom plate;

[0026] S34. After the transverse bulkheads are assembled to form the cabin, the cabin capacity data during the assembly and welding of the transverse bulkheads shall be tracked and controlled. If there is any deviation, the assembly and welding sequence shall be adjusted in time to control the dimensional accuracy of the entire cabin.

[0027] Furthermore, the S4 specifically includes the following steps:

[0028] S41. Use Leica P40 3D scanner to collect geometric information (x, y, z) of multiple points in the actual cabin and generate point cloud data;

[0029] S42. The point cloud data of the actual cabin on site is combined with the EcoPass simulation test software to simulate the spatial movement trajectory of the container on the container position.

[0030] Furthermore, before the simulation test box, the accuracy error analysis was carried out on the spacing dimensions of the guide rail frames, the spacing dimensions of the container sliding into the stacking cone, and the level of the adjustment pads at the four corners of the container.

[0031] Furthermore, the standard ranges of the length and width of the guide rail in the digital simulation test box are defined as follows: the standard range of the length Δx deviation is -25 to +25 mm; the standard range of the length Δy deviation is -14 to +20 mm.

[0032] Furthermore, the standard range of the distance from the center of the stack cone to the inner opening of the guide frame in the digital simulation test box is defined as follows: the deviation value of the length D(X) from the center of the stack cone to the inner opening of the guide frame can be -12.5mm≤X≤12.5mm, and the deviation value of the width D(Y) from the center of the stack cone to the inner opening of the guide frame can be -7mm≤Y≤10mm. The deviation values ​​of the four corners of the container must meet the above requirements at the same time, and the container body can slide into the stack cone.

[0033] Furthermore, the horizontal range of the adjustable pads at the four corners of the container in the digital simulation test box is defined as follows: the four bases of a single container are located in the same area, the standard range of the pad level within a container position is ≤3mm, and the allowable limit of the pad level within a container position is ≤4mm.

[0034] The present invention analyzes the standard practice of digital simulation test box of three-dimensional scanning of ships, and determines whether the deviation in the digital simulation test box meets the requirements according to the error range of the distance between the container and the guide frame, the error range of the distance between the stack cone and the guide rail, and the horizontal error range of the adjustment pads at the four corners of the container defined in the study. When the requirements are met, the entire digital simulation test box meets the requirements. If there is an over-tolerance, the on-site over-tolerance problem needs to be corrected to meet the test box requirements. The success of the efficient test box is fully demonstrated, replacing the original simulation test box, improving the installation accuracy of the box position, and realizing the lean shipbuilding model. Provide new processes and methods for the efficient construction of large container ships and rapid positioning of box positions in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A top view of the cargo hold according to the present invention;

[0036] Figure 2 It is a schematic diagram of the guide rail frame of the present invention;

[0037] Figure 3 It is a structural schematic diagram of the cabin coaming and transverse bulkhead according to the present invention;

[0038] Figure 4 This is a schematic diagram of the guide rail pre-assembly of the present invention;

[0039] Figure 5 This is a schematic diagram of the four-corner adjustment pads of the present invention;

[0040] Among them, 1-guide rail, 2-transverse bulkhead, 3-hatch coaming top plate, 4-guide rail pre-installation reference line, 5-first guide rail, 6-stacking cone, 7-adjusting pad, 8-standard container. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] like Figure 1 to Figure 5 As shown, a container ship test box accuracy control method specifically includes the following steps:

[0043] S1. Precision control of guide rail group prefabrication;

[0044] S2. Precision control of transverse bulkheads, hatch transverse coaming prefabrication and guide rail preinstallation;

[0045] S3. Precision control of transverse bulkhead and guide rail positioning during the closing phase;

[0046] S4. Use Leica P40 3D scanner to conduct 3D digital simulation test of the whole ship cabin.

[0047] The S1 specifically includes the following steps:

[0048] S11. Before making the guide rail, the level of the tire frame and the straightness of the pallet should be controlled and checked, and the construction can be carried out only after the accuracy requirement of ±1mm is met;

[0049] S12. Prefabrication of guide rails;

[0050] S13. After the guide rail is manufactured, the guide rail straightness is checked by wire drawing method to meet the guide rail straightness standard of ±2mm.

[0051] The S2 specifically includes the following steps:

[0052] S21. Prefabrication of transverse bulkheads: Before the construction of transverse bulkheads, a positioning ground line shall be made on site. When locating the main plate or platform, the positioning shall be carried out by setting out in a 1:1 ratio with reference to the ground line;

[0053] S22. Precision control and pre-installation of hatch transverse coaming: When constructing the hatch transverse coaming, the horizontal accuracy of the top plate is controlled within ±2mm. After the top plate of the hatch transverse coaming reaches the required level, it is assembled with the transverse bulkhead structure, and the positioning accuracy of the hatch transverse coaming is tracked and controlled;

[0054] S23. Make the guide rail pre-installation reference line: refer to the three-dimensional data of the transverse bulkhead structure, determine the guide rail pre-installation reference line on site, and make the guide rail pre-installation reference line coincide with the transverse bulkhead structure; after the reference line on one side of the transverse bulkhead is made, it is reversed to the other side of the transverse bulkhead, and the guide rail pre-installation reference lines on both sides of the transverse bulkhead are unified;

[0055] S24. Pre-installation of guide rails on one side of transverse bulkhead: pre-install the guide rail at the middle joint first as the first guide rail. After checking the height, half-width and horizontal dimensions of the first guide rail to be qualified, pre-install the remaining guide rails on one side of transverse bulkhead based on the half-width of the first guide rail. After the guide rails are pre-installed, welding is carried out. Before and after welding, the pre-installation of the guide rails is checked according to the standards of guide rail gap +1mm, horizontal -3ˋ+1mm, and inverted cap extending 20mm from the cabin coaming top plate;

[0056] S25. Pre-installation of guide rails on the other side of the transverse bulkhead: turn over the transverse bulkhead and place it on a bracket or a flower stand, then use the previously reversed reference line as the reference to lay out and pre-install the guide rails on that side. After the rails are pre-installed, weld them. Before and after welding, check the pre-installation of the guide rails according to the standards.

[0057] The S3 specifically includes the following steps:

[0058] S31. Based on the precision control and inspection data of transverse bulkheads, guide rails and hatch transverse coaming top plates in the segmented stage, the dimensional relationship between the cargo hold capacity and container space is controlled as a whole before closing and loading. Based on the dimensional chain of cargo hold cones and guide rails, an overall closing control plan is formulated, namely

[0059] Formulate cargo hold dimension chain loading plan and provide positioning control principles for cargo hold height, half width, front and back;

[0060] S32. Sectional closing of double bottom, hopper tank, transverse bulkhead and upper wing tank in cargo hold area: Carry out in accordance with the requirements of the formulated overall closing control plan, and strictly control the positioning accuracy of the sections in the cargo hold area; according to the pre-installed state of the guide rails at the sectioning stage and the three-dimensional completion accuracy dimension data of the double bottom, hopper tank, transverse bulkhead and upper wing tank sections and the guide rails after welding, simulate the loading of all sections in advance according to the requirements of the cargo hold dimension chain, and sort out the best closing positioning plan for each section, that is, the positioning height, half width, front and rear dimensions of the double bottom, hopper tank, transverse bulkhead and upper wing tank sections in the cargo hold area;

[0061] S33. Before the middle closing of the transverse bulkhead sections, simulation analysis of the closing of the port and starboard transverse bulkheads shall be conducted based on the overall three-dimensional dimension data of the guide rail pre-installed on the transverse bulkhead after completion, and the butt joint clearance of the transverse bulkheads and the opening size of the guide rails at the closing opening shall be analyzed. The butt joint clearance shall be ≤16mm, and the guide rail clearance shall meet the requirements of +3 to +8mm. During the on-site positioning stage of the middle closing of the transverse bulkhead sections, the closing height reference of the transverse bulkhead sections shall be used to control the horizontal level of the transverse hatch coaming to be ±3mm, and the opening size of the guide rails at the closing opening shall meet the requirements of +3 to +8mm.

[0062] S34. After the transverse bulkheads are closed together, they form large groups of sections. Before positioning the large groups of sections, a positioning plan corresponding to each group of transverse bulkheads shall be formulated according to the cabin capacity formed by each cabin; on site, the positioning height, front and rear verticality and center position requirements of each group of transverse bulkheads shall be ensured to be consistent with the center of the inner bottom plate;

[0063] S34. After the transverse bulkheads are assembled to form the cabin, the cabin capacity data during the assembly and welding of the transverse bulkheads shall be tracked and controlled. If there is any deviation, the assembly and welding sequence shall be adjusted in time to control the dimensional accuracy of the entire cabin.

[0064] The S4 specifically includes the following steps:

[0065] S41. Use Leica P40 3D scanner to collect geometric information (x, y, z) of multiple points in the actual cabin and generate point cloud data;

[0066] S42. The point cloud data of the actual cabin on site is combined with the EcoPass simulation test software to simulate the spatial movement trajectory of the container on the container position.

[0067] Before the simulation test, the accuracy error analysis of the guide rail spacing, the spacing between the container sliding into the stacking cone, and the level of the container's four corner adjustment pads was carried out.

[0068] The standard range of the length and width of the guide rail is defined as follows: the standard range of the length Δx deviation is -25 to +25 mm; the standard range of the length Δy deviation is -14 to +20 mm;

[0069] Definition of standard range of distance from the center of the stacking cone to the inner opening of the guide frame: the deviation value of length D(X) from the center of the stacking cone to the inner opening of the guide frame can be -12.5mm≤X≤12.5mm, and the deviation value of width D(Y) from the center of the stacking cone to the inner opening of the guide frame can be -7mm≤Y≤10mm. The deviation values ​​of the four corners of the container must meet the above requirements at the same time, and the container body can slide into the stacking cone.

[0070] Definition of the horizontal range of the adjusting pads at the four corners of the container: The four bases of a single container are located in the same area, the standard range of the pad level within a container space is ≤3mm, and the allowable limit of the pad level within a container space is ≤4mm.

[0071] Taking the ZG4600 container as an example, a container ship test container accuracy control method specifically includes the following steps:

[0072] 1. Precision control of prefabrication of group vertical guide rails

[0073] In order to ensure the accuracy of the production straightness, the accuracy of the production platform must be controlled. Before the guide rail is produced, the level of the tire frame and the straightness of the pallet must be controlled and checked, and construction can only be carried out after meeting the accuracy requirement of ±1mm.

[0074] The straightness standard of guide rail 1 is ±2mm. In order to meet the prefabrication and installation accuracy of the guide rail, the straightness of the guide rail is tested by drawing a steel wire after the guide rail is manufactured.

[0075] 2. Prefabrication control of segmented bulkhead guide rails

[0076] ① Transverse bulkhead structure 2 is the basis for pre-installation of guide rails. Before the construction of the transverse bulkhead, a positioning ground line is made on site. When the main board is assembled or the platform is positioned, the positioning is carried out with reference to the ground line at a 1:1 ratio, thus ensuring the accuracy of the transverse bulkhead structure.

[0077] ②Precision control and pre-installation of hatch transverse

[0078] The hatch transverse coaming top plate 3 is the reference for the guide rail pre-installation height direction. Therefore, the level of the hatch transverse coaming top plate 3 (±2mm) is strictly controlled during the hatch transverse coaming assembly and construction. After the level of the hatch transverse coaming top plate 3 reaches the requirement, it is assembled with the transverse bulkhead 2, and the positioning accuracy of the hatch transverse coaming is tracked and controlled.

[0079] ③ Production of guide rail pre-installation reference line 4

[0080] With reference to the three-dimensional data of transverse bulkhead 2, the datum line is determined on site to make the guide rail pre-installation datum line coincide with transverse bulkhead 2. After the datum line on one side of the transverse bulkhead is completed, it is reversed to the other side of the transverse bulkhead to make the guide rail pre-installation datum on both sides of the transverse bulkhead unified, laying a good foundation for the later guide rail pre-installation and the closing of the transverse bulkhead.

[0081] ④ Pre-installation of guide rails

[0082] When pre-installing the guide rails, pre-install the first guide rail 5 at the middle closing opening first. After the first guide rail has been inspected and qualified, pre-install other guide rails based on the first guide rail to prevent overall adjustment after all are installed, thereby improving the on-site pre-installation qualification rate and efficiency. After the guide rails are pre-installed, the pre-installation situation is checked according to the standards before and after welding.

[0083] After the single-side guide rail is pre-installed and qualified, turn it over and pre-install the other side guide rail. After the transverse bulkhead is turned over, pay attention to placing the structure on the bracket or flower rack to avoid contact between the guide rail and the bracket or flower rack, and avoid deformation of the guide rail.

[0084] After turning over, use the previously reversed reference line as the reference to lay out the lines and pre-install the guide rails.

[0085] 3. Bulkhead guide rail positioning accuracy control during closing stage

[0086] ① Through the sharing of control and inspection data information of outfitting parts such as transverse bulkhead 2 and guide rail 1 in the early stage, before closing and loading, the dimensional relationship between the capacity and container space of the overall control cargo hold is considered in advance, and an overall closing control plan is formulated based on the dimensional chain of cargo hold cones, guide rails and hatch cover box corners.

[0087] ② During the closing process, the plan requirements are implemented to ensure that the cargo hold capacity of the entire ship and the size of each container position meet the requirements, and the ship passes the test container once. During the closing stage, the positioning accuracy of the cargo hold section is strictly controlled. According to the status and data information provided in the section stage, all sections are simulated and loaded in advance according to the requirements of the dimension chain, and the best closing positioning plan for each section is sorted out, which effectively controls the cumulative deviation of the positioning of the hull section structure, resulting in poor accuracy of the stacking cone and guide rail.

[0088] ③ Before closing the transverse bulkhead sections, simulate and analyze the port and starboard transverse bulkheads according to the section data information, and formulate a closing positioning plan.

[0089] During the on-site positioning phase of the scheme, the segmented closing benchmark was used to strictly control the horizontal level of the transverse hatch coaming and the opening size of the guide rails between the closing openings as required, ensuring the consistency of the large and small guide rails in the transverse bulkhead after closing.

[0090] ④ After the transverse bulkheads are closed, large groups of sections are formed. Before the large groups of sections are positioned, a positioning plan corresponding to each group of transverse bulkheads is formulated according to the cabin capacity formed by each cabin.

[0091] The on-site requirements ensure that the centers of the transverse bulkhead and the inner bottom plate are consistent to achieve the matching accuracy of the transverse bulkhead guide rail and the inner bottom plate cone.

[0092] After the transverse bulkheads are closed to form the cabin, the cabin capacity data is tracked and controlled during the assembly and welding of the transverse bulkheads. If there is a deviation, the assembly and welding sequence is adjusted in time to control the dimensional accuracy of the entire cabin. Avoid excessive cabin capacity changes during construction, which will affect the smooth progress of the subsequent simulation test.

[0093] 4. Three-dimensional digital simulation test chamber for the entire ship cabin

[0094] The Leica P40 3D scanner is used to collect the actual cabin point cloud model on site. The 3D scanner is a new generation of measuring instruments that obtains dimensional data through scanning methods. Its function is to calculate the distance of the object through the time or phase difference when the laser emitted by the scanner returns. The purpose of the scanner is to sample the geometric information (x, y, z) on the surface of the object and generate point cloud data. In conjunction with the EcoPass simulation test box software, it simulates the spatial running trajectory of the container on the box position.

[0095] Through the detection of three-dimensional scanners, digital simulation test boxes can be carried out on the dimensions of the guide rails 1, stacking cones 6, adjustment pads 7 and other dimensions in the cargo hold. The actual data on site can be internally controlled in advance according to the simulation test box standards. Only when the digital simulation test box meets the requirements can the actual on-site random inspection test box be carried out. Through the implementation and tracking of the ZG4600 project, the test box requirements can be fully achieved, and the actual test box status is consistent with the simulation test box status.

[0096] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A container ship test box accuracy control method, characterized in that: The specific steps include: S1. Precision control of guide rail group prefabrication; S2. Precision control of transverse bulkheads, hatch transverse coaming prefabrication and guide rail preinstallation; S3. Precision control of transverse bulkhead and guide rail positioning during the closing phase; S4. Use Leica P40 3D scanner to conduct 3D digital simulation test of the whole ship cabin.

2. A container ship test box accuracy control method according to claim 1, characterized in that: The S1 specifically includes the following steps: S11. Before making the guide rail, the level of the tire frame and the straightness of the pallet should be controlled and checked, and the construction can be carried out only after the accuracy requirement of ±1mm is met; S12. Prefabrication of guide rails; S13. After the guide rail is manufactured, the guide rail straightness is checked by wire drawing method to meet the guide rail straightness standard of ±2mm.

3. A container ship test box accuracy control method according to claim 1, characterized in that: The S2 specifically includes the following steps: S21. Prefabrication of transverse bulkheads: Before the construction of transverse bulkheads, a positioning ground line shall be made on site. When locating the main plate or platform, the positioning shall be carried out by setting out in a 1:1 ratio with reference to the ground line; S22. Precision control and pre-installation of hatch transverse coaming: When constructing the hatch transverse coaming, the horizontal accuracy of the top plate is controlled within ±2mm. After the top plate of the hatch transverse coaming reaches the required level, it is assembled with the transverse bulkhead structure, and the positioning accuracy of the hatch transverse coaming is tracked and controlled; S23. Make the guide rail pre-installation reference line: refer to the three-dimensional data of the transverse bulkhead structure, determine the guide rail pre-installation reference line on site, and make the guide rail pre-installation reference line coincide with the transverse bulkhead structure; after the reference line on one side of the transverse bulkhead is made, it is reversed to the other side of the transverse bulkhead, and the guide rail pre-installation reference lines on both sides of the transverse bulkhead are unified; S24. Pre-installation of guide rails on one side of transverse bulkhead: pre-install the guide rail at the middle joint first as the first guide rail, and after checking whether the height, half-width and horizontal dimensions of the first guide rail are qualified, pre-install the remaining guide rails on one side of transverse bulkhead based on the half-width of the first guide rail; after the guide rails are pre-installed, weld them, and check the pre-installation of the guide rails before and after welding according to the standards of guide rail gap +1mm, horizontal -3`+1mm, and inverted cap extending 20mm from the cabin coaming top plate; S25. Pre-installation of guide rails on the other side of the transverse bulkhead: turn over the transverse bulkhead and place it on a bracket or a flower stand, then use the previously reversed reference line as the reference to lay out and pre-install the guide rails on that side. After the rails are pre-installed, weld them. Before and after welding, check the pre-installation of the guide rails according to the standards.

4. A container ship test box accuracy control method according to claim 3, characterized in that: The S3 specifically includes the following steps: S31. Based on the precision control and inspection data of transverse bulkheads, guide rails and hatch transverse coaming top plates in the segmented stage, the dimensional relationship between the cargo hold capacity and container space is controlled as a whole before closing and loading. Based on the dimensional chain of cargo hold cones and guide rails, an overall closing control plan is formulated, namely Formulate cargo hold dimension chain loading plan and provide positioning control principles for cargo hold height, half width, front and back; S32. Sectional closing of double bottom, hopper tank, transverse bulkhead and upper wing tank in cargo hold area: Carry out in accordance with the requirements of the formulated overall closing control plan, and strictly control the positioning accuracy of the sections in the cargo hold area; according to the pre-installed state of the guide rails at the sectioning stage and the three-dimensional completion accuracy dimension data of the double bottom, hopper tank, transverse bulkhead and upper wing tank sections and the guide rails after welding, simulate the loading of all sections in advance according to the requirements of the cargo hold dimension chain, and sort out the best closing positioning plan for each section, that is, the positioning height, half width, front and rear dimensions of the double bottom, hopper tank, transverse bulkhead and upper wing tank sections in the cargo hold area; S33. Before the middle closing of the transverse bulkhead sections, simulation analysis of the closing of the port and starboard transverse bulkheads shall be conducted based on the overall three-dimensional dimension data of the guide rail pre-installed on the transverse bulkhead after completion, and the butt joint clearance of the transverse bulkheads and the opening size of the guide rails at the closing opening shall be analyzed. The butt joint clearance shall be ≤16mm, and the guide rail clearance shall meet the requirements of +3~+8mm. During the on-site positioning stage of the middle closing of the transverse bulkhead sections, the closing height reference of the transverse bulkhead sections shall be used to control the horizontal level of the transverse hatch coaming to be ±3mm, and the opening size of the guide rails at the closing opening shall meet the requirements of +3~+8mm. S34. After the transverse bulkheads are closed together, they form large groups of sections. Before positioning the large groups of sections, a positioning plan corresponding to each group of transverse bulkheads shall be formulated according to the cabin capacity formed by each cabin; on site, the positioning height, front and rear verticality and center position requirements of each group of transverse bulkheads shall be ensured to be consistent with the center of the inner bottom plate; S34. After the transverse bulkheads are assembled to form the cabin, the cabin capacity data during the assembly and welding of the transverse bulkheads shall be tracked and controlled. If there is any deviation, the assembly and welding sequence shall be adjusted in time to control the dimensional accuracy of the entire cabin.

5. A container ship test box accuracy control method according to claim 4, characterized in that: The S4 specifically comprises the following steps: S41. Use Leica P40 3D scanner to collect geometric information (x, y, z) of multiple points in the actual cabin and generate point cloud data; S42. The point cloud data of the actual cabin on site is combined with the EcoPass simulation test software to simulate the spatial movement trajectory of the container on the container position.

6. A container ship test box accuracy control method according to claim 5, characterized in that: Before the simulation test, the accuracy error analysis is carried out on the spacing dimensions of the guide rail frames, the spacing dimensions when the container slides into the stacking cone, and the level of the adjustment pads at the four corners of the container.

7. A container ship test box accuracy control method according to claim 6, characterized in that: The standard range of the length and width of the guide rail frame is defined as follows: the standard range of the length Δx deviation is -25 to +25 mm; the standard range of the length Δy deviation is -14 to +20 mm.

8. A container ship test box accuracy control method according to claim 7, characterized in that: The standard range of the distance from the center of the stacking cone to the inner opening of the guide frame is defined as follows: the deviation value of the length D(X) from the center of the stacking cone to the inner opening of the guide frame can be -12.5mm≤X≤12.5mm, and the deviation value of the width D(Y) from the center of the stacking cone to the inner opening of the guide frame can be -7mm≤Y≤10mm. The deviation values ​​of the four corners of the container must meet the above requirements at the same time, and the container body can slide into the stacking cone.

9. A container ship test box accuracy control method according to claim 7, characterized in that: The horizontal range of the adjustable pads at the four corners of the container is defined as follows: the four bases of a single container are located in the same area, the standard range of the pad level within a container position is ≤3mm, and the allowable limit of the pad level within a container position is ≤4mm.

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