Carrying method of ship curved structure

Abstract

The invention provides a ship curved structure carrying method, which comprises the following steps of: firstly, measuring a positioning area of a curved structure to be carried, assigning a first curve on a first curved surface of the positioning area, and recording three-dimensional coordinate values S1 of a plurality of first reference points of a first curve path; then the posture of the curved structure is adjusted, the posture of the curved structure is made to be consistent with the final posture required by the technology when the curved structure is carried to the positioning area, a total station or a high-end laser tracker is used for drawing the cutting allowance, and finally the curved structure is repaired and cut according to the cutting allowance. And the curved surface line type of the positioning area is attached to realize allowance-free carrying. According to the method, allowance determination work is carried out in advance, the allowance is cut in advance, one-time cabin entering positioning is successful, the construction period is shortened, and the field production efficiency is improved. Meanwhile, different positioning schemes are provided for a total station or a high-end laser tracker, and diversified requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly to a method for installing a curved structure of a ship. Background Art

[0002] During the shipbuilding process, the construction technology in the curved structure area is particularly complex. Since the butt joint surface in this area presents a non-linear arc characteristic, there are many technical difficulties in the positioning and installation stage of curved structures such as internal bases and platforms. Construction workers usually need to adopt a process route of "primary positioning - allowance correction - secondary positioning": First, the structural member is lifted by a hydraulic jack or an adjusting bolt, or translated a certain distance along the chord direction to achieve primary positioning while maintaining the theoretical line shape to determine the allowance data in the butt joint area, and then the base is lifted off the positioning position for allowance cutting work. After the allowance cutting is completed, the structure is re-positioned for the second time.

[0003] The entire installation process usually requires 2 - 3 hoisting cycles to be repeated. This traditional process not only causes waste of hoisting resources, but also requires coordination of multiple types of work such as measurement, lifting, and assembly in each positioning link. The process is cumbersome and the construction period is long, seriously restricting the shipbuilding progress and bringing a significant increase in labor and mechanical costs. This inefficient positioning method has become one of the key bottlenecks restricting the overall construction period. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the present invention provides a method for installing a curved structure of a ship, including the following steps:

[0005] T1: Determine the positioning area on the ship and the corresponding curved structure. The connection surface between the curved structure and the positioning area on the ship is a curved surface; on the first curved surface in the positioning area for installing the curved structure, locate the first reference points. The connection line of multiple first reference points in the ship width direction forms the first curve, and record the three-dimensional coordinate values S1 of multiple first reference points passed by the first curve.

[0006] T2: Adjust the attitude of the curved structure placed on the ground to ensure that the attitude of the curved structure before data measurement is consistent with the final attitude required by the technical requirements when it is installed in the positioning area, so as to simulate the final attitude of the curved structure when it is installed in the positioning area. Then, use a total station or a high-end laser tracker to mark the cutting allowance line of the curved structure.

[0007] T3: Perform allowance cutting work according to the allowance line, so as to achieve the installation of the structure without allowance.

[0008] Optionally, the curved structure includes a base, a platform, and a cabin.

[0009] Optionally, in step T1, the projection of the first curve in the ship's reference plane is perpendicular to the ship's center line and parallel to the rib reference line. The ship's reference plane is parallel to the horizontal plane. The first curve gradually approaches the ship's center line from top to bottom, and multiple first curves are arranged along the ship's length direction.

[0010] Optionally, the arc length spacing between two adjacent first reference points is 200 mm.

[0011] Optionally, in step T1, the positioning of the first curve includes:

[0012] When using a total station, a hull coordinate system is established based on the ship's reference plane, the ship's center line, and the rib reference line. According to the design coordinate values on the design drawing, first reference points are marked on the first surface in the positioning area, and the actual three-dimensional coordinate values of the first reference points are recorded. Then, the first reference points are connected to form the first curve;

[0013] When using a high-end laser tracker, there is no need to draw lines. By inputting in advance the design coordinate values corresponding to the first reference points and using the instrument's pointing and measuring function, automatic finding and measurement of the first reference points are realized.

[0014] Optionally, in step T2, when using a total station for measurement, the marking of the cutting allowance line includes the following steps:

[0015] T2-11: Based on the positioning reference line of the typical structure and combined with the sampling density of the first reference points, marks are made on the second surface where the typical structure is connected to the positioning area to form second reference points. The number and positions of the second reference points correspond to the number and positions of the first reference points;

[0016] According to the coordinates of the preset position where it is carried to the positioning area in the hull coordinate system based on the positioning reference line, and combined with the relative distance between the second reference point and the positioning reference line, the three-dimensional coordinates S2 of the second reference point in the hull coordinate system are obtained, thereby realizing the unification of the coordinate systems of the typical structure and the positioning area;

[0017] T2-12: After the data collection is completed, the deviation value S3 between the S1 data of the first reference point and the S2 data of the second reference point is obtained through calculation;

[0018] T2-13: Determine the allowance line through the deviation value.

[0019] Optionally, the deviation value S3 includes the point axial deviation value △L1 in the X, Y, and Z directions and the point radial deviation value △L2 in the radial direction of the arc of the second surface;

[0020] When determining the allowance line according to △L1, first use a spirit level to mark a horizontal line or a vertical line on the curved structure; then mark the deviation value △L1 inward along the plate edge on the horizontal line or the vertical line to obtain the allowance points.

[0021] When determining the allowance line according to △L2, use a corresponding right-angle ruler to achieve radial dimension marking; when marking, make one right-angle side of the right-angle ruler 5 tangent to the edge of the second curved surface of the curved structure, and make the other right-angle side perpendicular to the edge of the second curved surface, and then mark the point radial deviation value △L2 inward from the edge to obtain the allowance points.

[0022] Finally, connect the allowance points to form a smooth line to complete the marking of the allowance line.

[0023] Optionally, in step T2, when using a high-end laser tracker for data measurement, the marking of the cutting allowance includes the following steps:

[0024] When measuring the horizontal reference point, the bow and stern reference point, and the width reference point corresponding to the positioning reference line of the curved structure and making them meet the requirements of levelness and straightness, ensure that the attitude of the curved structure is the final attitude required by the technical requirements when it is carried to the positioning area, measure the positioning reference line, and then adjust the position coordinates of the positioning reference line to the values in the hull coordinate system to achieve the benchmark unity with the positioning area; through the automatic point-finding function of the measuring instrument, use a laser to mark the three-dimensional coordinate points of S1 on the curved structure one by one; the marking of the first reference point corresponding to S1 on the curved structure is the allowance point; connect the allowance points with a spline to form a smooth line to complete the marking of the allowance line.

[0025] As described above, the present invention provides a method for carrying a curved structure of a ship. The carrying method first measures the positioning area of the curved structure to be carried, marks a first curve on the first curved surface of the positioning area, and records the three-dimensional coordinate values S1 of multiple first reference points passed by the first curve; then adjusts the attitude of the curved structure to make the attitude of the curved structure consistent with the final attitude required by the technical requirements when it is carried to the positioning area, uses a total station or a high-end laser tracker to mark the cutting allowance, and finally repairs and cuts the curved structure according to the cutting allowance to make it fit the curved surface line type of the positioning area to achieve non-allowance carrying.

[0026] Through the present invention, it is possible to solve the problem that during the conventional positioning of the curved structure, secondary hoisting and positioning are required to determine the allowance, cut the allowance, and finally complete the structure positioning work. It can reduce the number of on-site structure hoistings, reduce the deformation of the structure caused by more hoistings; it can reduce the number of times of hoisting into the cabin, reduce the on-site labor intensity and reduce the construction safety hazards; it can advance the allowance determination work, cut the allowance in advance, and succeed in positioning in the cabin once, saving the construction period and improving the on-site production efficiency. At the same time, different positioning schemes are provided for the total station or the high-end laser tracker to meet diverse requirements. Brief Description of the Drawings

[0027] Figure 1 It shows a top view for measuring the positioning area in the first embodiment of the present invention.

[0028] Figure 2 It shows a side view when the typical structure in the first embodiment of the present invention is mounted to the positioning area and the positioning reference line reaches the preset position.

[0029] Figure 3 It shows a measurement diagram of the typical structure in the first embodiment of the present invention.

[0030] Figure 4 It shows a schematic diagram for horizontally marking the axial deviation value of a point position by the deviation method in the first embodiment of the present invention.

[0031] Figure 5 It shows a schematic diagram for marking the radial deviation value of a point position by the deviation method in the first embodiment of the present invention.

[0032] Figure 6 It shows a schematic diagram for marking the remaining points on the typical structure by the assignment method in the first embodiment of the present invention.

[0033] Figure 7 It shows a flowchart of the mounting method in the first embodiment of the present invention.

[0034] Description of Component Labels

[0035] Measuring device 1, positioning area 2, typical structure 3, spirit level 4, square 5, design coordinate value 22, first reference point 23, first curve 21, ship reference plane 10, frame reference line 20, ship center line 30, positioning reference line 31, second reference point 32, remaining point 33, remaining line 34. Detailed Description of the Invention

[0036] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0037] When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention here. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0038] For ease of description, spatial relationship terms such as "below", "beneath", "lower", "under", "above", "on" may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relationship terms are intended to encompass other orientations of the device in use or operation, in addition to the orientation depicted in the drawings. Further, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can be one or more intervening layers. As used herein, "between... and..." means including the endpoint values.

[0039] In the context of the present application, the structure in which the first feature is "above" the second feature as described may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0040] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0041] Embodiment 1

[0042] As Figures 1 to 7 shown, this embodiment provides a method for installing a ship's curved structure, including the following steps:

[0043] T1: Provide a curved structure 3 (including a base or platform, a cabin), the connection surface between the curved structure 3 and the positioning area 2 on the ship is a curved surface; on the first curved surface of the positioning area for installing the curved structure, locate the first reference points 23, as Figure 1 shown, the connection lines of multiple first reference points 23 along the ship's breadth direction form a first curve 21, and a measuring device 1 records the three-dimensional coordinate values S1 of the multiple first reference points 23 passed by the first curve 21. As an example, the projection of the first curve 21 in the ship's reference plane 10 is perpendicular to the ship's centerline 30 and parallel to the rib position reference line 20, the ship's reference plane 10 is parallel to the horizontal plane, the first curve 21 gradually approaches the ship's centerline from top to bottom, and multiple first curves 21 are arranged along the ship's length direction.

[0044] Specifically, the positioning of the first curve 21 includes:

[0045] When using a total station, a hull coordinate system is established with the ship's reference plane 10, the ship's center line 30, and the rib position reference line 20 as the reference. According to the design coordinate value 22 on the design drawing, the first reference point 23 is marked on the first surface of the positioning area, and the actual three-dimensional coordinate value S1 of the first reference point 23 is recorded. Then, the first reference points 23 are connected to form the first curve 21.

[0046] When using a high-end laser tracker, it is not necessary to draw lines. By inputting in advance the design coordinate value 22 corresponding to the first reference point 23, through the instrument pointing and measuring function, the automatic finding and measurement of the first reference point 23 can be realized.

[0047] During the above process of finding points, the design coordinate value 22 is extracted from the design data model according to the position of the measurement point on the demand side. When the design coordinate value 22 is not within the first surface, that is, there is a deviation in actual construction, the intersection point of the vertical line where the design coordinate value 22 is located and the first surface is used as the first reference point 23.

[0048] The data density in the typical structure area is determined according to the positioning structure range. Generally, the arc length spacing between two adjacent first reference points 23 is about 200 mm. When the arc length of a single first curve 21 is no more than 200 mm, the number of first reference points is evenly distributed and not less than three points.

[0049] After the data measurement is completed, it is saved as S1 in the form of three-dimensional point coordinates (X / Y / Z).

[0050] Next, step T2 is carried out: Adjust the attitude of the typical structure 3 placed on the ground to ensure that the attitude of the typical structure before data measurement is the same as the final attitude required by the technical requirements when it is carried to the positioning area, that is, simulate the final attitude when the typical structure 3 is carried to the positioning area 2. Then, use a total station or a high-end laser tracker to mark the cutting allowance line.

[0051] When using a total station for measurement, the marking of the cutting allowance line includes the following steps:

[0052] T2-11: Based on the positioning reference line 31 of the typical structure 3, and combined with the sampling density of the first reference point, marks are made on the second surface where the typical structure 3 is connected to the positioning area 2 to form the second reference point 32, such as Figure 2 、 Figure 3As shown, the quantity and position of the second reference points 32 correspond to those of the first reference points 23. The positioning reference line 31 is the bow-stern, width, and height reference points marked on a flat surface during the completion stage of the construction of the curved structure 3. The positioning reference line 31 is the positioning standard when the curved structure 3 is carried to the positioning area. After trimming and attitude adjustment of the curved structure 3, when the positioning reference line can reach the preset position when it is carried to the positioning area, it is considered that the curved structure 3 is installed in place and meets the accuracy requirements. As an example, the positioning reference line 31 is a straight line along the bow-stern direction of the ship. During the process, by calculating the relative position relationship (including relative azimuth and angle) between the first reference point and the preset position of the positioning reference line (the preset position where the positioning reference line is located when the carrying is completed), and mapping it to the position relationship between the second reference point and the positioning reference line, the position of the second reference point is determined; since the distance between the second reference point and the positioning reference line is usually greater than the distance between the first reference point and the preset position of the positioning reference line, that is, there is a certain margin in the curved structure, so the relative position relationship referred to here mainly refers to the relative azimuth and angle. The intersection point of the auxiliary line where the relative azimuth and angle are located and the second curved surface of the curved structure is used as the position of the second reference point.

[0053] According to the coordinates of the preset position where the positioning reference line 31 is located in the hull coordinate system when it is carried to the positioning area, and combined with the relative distance between the second reference point 32 and the positioning reference line 31, the three-dimensional coordinates S2 of the second reference point 32 in the hull coordinate system are obtained, so as to realize the coordinate system unification of the curved structure 3 and the positioning area 2. For example: The measured horizontal coordinate of the positioning reference line 31 is 1000, and the coordinate value of the theoretical preset position is 2000. Then, it is necessary to move the value of 1000 up by 1000 on the measuring instrument through the built-in software to make its value become 2000, and the adjustment in other directions is similar.

[0054] T2-12: After the data collection is completed, the deviation value S3 between the S1 data of the first reference point and the S2 data of the second reference point is obtained through calculation; here, special analysis software (such as EcoBlock, SpatialAnalyzer, etc.) can be used for data fitting;

[0055] First, import the S1 data and observe whether the data reference is consistent with the theoretical design reference. If not, adjust the data of the reference point position to make the reference point position data consistent with the theoretical design reference;

[0056] Import the S2 data and align the S2 reference with the S1 reference;

[0057] Through point connection, calculate the deviation value S3 between the points of the S1 data and the S2 data; the deviation value S3 can be the axial deviation value △L1 of the points in the X, Y, and Z directions, or the radial deviation value △L2 of the points on the second curved surface of the curved structure along the radial direction of the arc.

[0058] As an example, when analyzing on the EcoBlock software, the axial deviation values △L1 of the points in the X / Y / Z three directions can be obtained; when analyzing on the SpatialAnalyzer software, the radial deviation values △L2 of the points along the radial direction of the arc of the typical structure can be obtained.

[0059] T2-13: Determine the allowance through the deviation value, and this method needs to be carried out after data analysis and matching of S1 and S2; different analysis software corresponds to different S3 values, and there are also differences in the allowance line marking method.

[0060] The deviation values obtained through EcoBlock analysis are the axial deviation values △L1 of the points in the X, Y, and Z three directions. Therefore, when marking the allowance line, it is necessary to first mark a horizontal line or a vertical line on the typical structure with the help of the spirit level 4; then mark the deviation value △L1 along the plate edge and inward on the horizontal line or the vertical line, as Figure 4 shown;

[0061] The deviation values obtained through SpatialAnalyzer analysis are the radial deviation values △L2 of the points along the radial direction of the arc. When marking, it is necessary to use a corresponding square to achieve the marking of the radial dimension; when marking, make one right-angle side of the square 5 tangent to the edge of the second surface of the typical structure, make the other right-angle side perpendicular to the edge of the second surface, and then mark the radial deviation value △L2 of the point inward from the edge, as Figure 5 shown;

[0062] After the marking of the deviation value points is completed, use a spline to connect the allowance points 33 to form a smooth line, and complete the marking of the allowance line 34.

[0063] When using a high-end laser tracker for data measurement, the marking of the cutting allowance line includes the following steps:

[0064] T2-21: When using a high-end laser tracker for data measurement, it is possible to mark without drawing lines. By pre-entering the design coordinate value 22 of the first reference point 23, the allowance is determined by the assignment method through the instrument pointing and measuring function.

[0065] Specifically, after completing the S1 data measurement, the assignment method can be used to demarcate the surplus; when using the assignment method, the measuring device should support the automatic pointing function; when measuring the horizontal reference points (the four corner positions on the positioning structure platform), the bow and stern reference points (the two points on the left and right of the transverse reference line of the positioning structure platform), and the width reference points (the two bow and stern points on the longitudinal reference line of the positioning structure platform) corresponding to the positioning reference line of the typical structure and ensuring that they meet the requirements of flatness and straightness, ensure that the attitude of the typical structure is the final attitude required by the technical requirements when being carried to the positioning area, measure the positioning reference line 31, and then adjust the position coordinates of the positioning reference line 31 and convert them into the values (L, H, B) in the hull coordinate system to achieve the benchmark unity with the positioning area; through the automatic point-finding function of the measuring instrument, use the laser to mark the three-dimensional coordinate points 23 in S1 one by one on the typical structure; the marking of the first reference point corresponding to S1 on the typical structure is the surplus point; connect the surplus points 33 with a spline to form a fair line, and complete the demarcation of the surplus line 34.

[0066] Finally, perform step T3, cut the surplus according to the surplus line 34, so as to achieve the non-surplus carrying of the structure. That is, complete the surplus cutting before hoisting and carrying, and one hoisting can meet the accuracy requirements without repeated hoisting and trimming, thus improving the on-site production efficiency.

[0067] In summary, the present invention provides a method for carrying a typical structure of a ship. The carrying method first measures the positioning area of the typical structure to be carried, demarcates the first curve on the first curved surface of the positioning area, and records the three-dimensional coordinate values S1 of multiple first reference points passed by the first curve; then adjusts the attitude of the typical structure to make the attitude of the typical structure consistent with the final attitude required by the technical requirements when being carried to the positioning area, uses a total station or a high-end laser tracker to demarcate the cutting surplus, and finally trims the typical structure according to the cutting surplus to make it fit the curved surface line type of the positioning area to achieve non-surplus carrying.

[0068] Through the present invention, it can solve the problem that the typical structure needs secondary hoisting and positioning to determine the surplus and cut the surplus during conventional positioning, and finally complete the structure positioning work. It can reduce the number of on-site structure hoistings, reduce the deformation of the structure caused by more hoistings; it can reduce the number of times of hoisting into the cabin, reduce the on-site labor intensity and reduce the construction safety hazards; it can advance the surplus determination work, cut the surplus in advance, and succeed in positioning in the cabin once, saving the construction period and improving the on-site production efficiency. At the same time, different positioning schemes are provided for the total station or the high-end laser tracker to meet diverse requirements.

[0069] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for installing a curved structure of a ship, characterized in that, It includes the following steps: T1: Determine the positioning area on the ship and the corresponding curved structure. The connection surface between the curved structure and the positioning area on the ship is a curved surface. Locate the first reference points on the first curved surface of the positioning area for mounting the curved structure. The connecting line of multiple first reference points in the ship width direction forms a first curve, and record the three-dimensional coordinate values S1 of multiple first reference points passed by the first curve; T2: Adjust the attitude of the curved structure placed on the ground to ensure that the attitude of the curved structure before data measurement is consistent with the final attitude required by the technical requirements when it is mounted to the positioning area, so as to simulate the final attitude of the curved structure when it is mounted to the positioning area. Then use a total station or a high-end laser tracker to mark the cutting allowance line of the curved structure; T3: Perform the allowance cutting work according to the allowance line, so as to achieve the non-allowance mounting of the structure.

2. The method for installing the ship's curved structure according to claim 1, characterized in that: The curved structure includes a base, a platform, and a cabin.

3. The method for installing the ship's curved structure according to claim 1, characterized in that: In step T1, the projection of the first curve in the ship reference plane is perpendicular to the ship center line and parallel to the rib reference line. The ship reference plane is parallel to the horizontal plane. The first curve gradually approaches the ship center line from top to bottom, and multiple first curves are arranged along the ship length direction.

4. The method for installing the ship's curved structure according to claim 1, characterized in that: The arc length spacing between two adjacent first reference points is 200 mm.

5. The method for mounting the ship's curved structure according to claim 1, characterized in that: In step T1, the positioning of the first curve includes: When using a total station, establish a hull coordinate system based on the ship reference plane, the ship center line, and the rib reference line. According to the design coordinate values on the design drawing, mark the first reference points on the first curved surface of the positioning area, record the actual three-dimensional coordinate values of the first reference points, and then connect the first reference points to form a first curve; When using a high-end laser tracker, there is no need to draw lines. By inputting the design coordinate values corresponding to the first reference points in advance, and through the instrument pointing and measuring function, automatic finding and measurement of the first reference points are realized.

6. The method for mounting the ship's curved structure according to claim 5, characterized in that: In step T2, when using a total station for measurement, the marking of the cutting allowance line includes the following steps: T2-11: Based on the positioning reference line of the curved structure, and combined with the sampling density of the first reference points, mark the second reference points on the second curved surface where the curved structure is connected to the positioning area. The number and position of the second reference points correspond to the number and position of the first reference points; According to the coordinates of the preset position where it is mounted to the positioning area in the hull coordinate system based on the positioning reference line, and combined with the relative distance between the second reference points and the positioning reference line, obtain the three-dimensional coordinates S2 of the second reference points in the hull coordinate system, so as to unify the coordinate systems of the curved structure and the positioning area; T2-12: After the collected data is calculated, obtain the deviation value S3 between the S1 data of the first reference points and the S2 data of the second reference points; T2-13: Determine the allowance line through the deviation value.

7. The method for mounting the ship's curved structure according to claim 6, characterized in that: The deviation value S3 includes the point axial deviation value △L1 in the X, Y, and Z directions and the point radial deviation value △L2 in the radial direction of the arc of the second curved surface; When determining the allowance line according to △L1, first use a spirit level to mark a horizontal line or a vertical line on the curved structure; Then mark the deviation value △L1 along the plate edge towards the inside on the horizontal line or the vertical line to obtain the allowance points; When determining the allowance line based on △L2, the radial dimension marking is achieved with the aid of a corresponding square; during the marking, one right-angled side of the square 5 is tangent to the edge of the second surface of the curved structure, and the other right-angled side is perpendicular to the edge of the second surface, and then the point radial deviation value △L2 is marked inward from the edge to obtain the allowance points; Finally, the allowance points are connected to form a fair line to complete the allowance line marking.

8. The method for installing the ship's curved structure according to claim 5, characterized in that: In step T2, when using a high-end laser tracker for data measurement, the marking of the cutting allowance includes the following steps: When measuring the horizontal reference point, bow and stern reference point, and width reference point corresponding to the positioning reference line of the curved structure and making them meet the requirements of levelness and straightness, ensure that the attitude of the curved structure is the final attitude required by the technical requirements when it is carried to the positioning area, measure the positioning reference line, and then adjust the position coordinates of the positioning reference line and convert them into values in the hull coordinate system to achieve the benchmark unity with the positioning area; through the automatic point-finding function of the measuring instrument, use the laser to mark the three-dimensional coordinate points of S1 on the curved structure one by one; the marking of the first reference point corresponding to S1 on the curved structure is the allowance point; the allowance points are connected by a spline to form a fair line to complete the allowance line marking.

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