A construction method for the stern part section without a stern tube sleeve

Abstract

The present invention provides a method for building the stern section without a stern tube sleeve. Side construction is carried out with the left side of the section as the base surface. The building method includes: S1. Build a curved surface jig, lay the port outer plate, and complete the positioning of the stern cast steel part on the jig; S2. Install the lower ribs, left ribs, and upper ribs in each platform and each rib plate; S3. Hoist the bow cast steel part; S4. Pull the steel wire rope as the axis hole center line of the stern section; S5. Adjust the relative positions of the bow cast steel part and the stern cast steel part based on the steel wire rope, and complete the welding; S6. Install and weld each right middle rib and the middle keel of the stern post; S8. Weld after the section is turned over. The present invention modifies the traditional vertical construction mode to a side construction mode to overcome the deficiency that in the vertical state, the stern cast steel part is extremely prone to sectional deformation and collapse due to the lack of support from the stern tube sleeve below, improves the sectional construction accuracy, reduces the amount of aerial work during sectional construction, and improves the operation safety.

Description

Technical Field

[0001] The invention belongs to the technical field of ship construction, and in particular relates to a method for constructing a stern section without a stern tube sleeve. Background Art

[0002] The stern section of a ship is mainly divided into a stern section with a stern tube cover and a stern section without a stern tube cover. Different stern sections are selected according to different needs (the stern tube cover can be used to protect the stern tube and the stern shaft, but there is air in the gap between the stern tube cover and the stern tube, which has a poor heat dissipation effect and affects the heat dissipation of the stern shaft).

[0003] Under normal conditions, the stern section will be constructed in a vertical manner, such as the application number 201711045931.3, and the patent name is a method for constructing a stern section, which uses the bow ribs of the stern section as the base to vertically hoist the bow steel castings and each platform plate, and then hoist the remaining ribs on the platform plate layer by layer to form a hull frame, and install other internal structures such as internal pipes during the construction of the hull frame; then hoist the outer plate on the hull frame to complete the positioning and welding of the outer plate; finally, hoist the stern steel casting to complete the vertical assembly of the entire stern section. Although this construction method is relatively simple and direct, due to the vertical construction method, the height of the entire section is relatively high (about 10m). During the construction of the section, there will be more high-altitude operations (such as high-altitude welding), which have high safety risks and great difficulty. In addition, since the stern steel casting is heavy (weighing up to 49t), if there is no stern tube sleeve (i.e., internal tube) for auxiliary support during its vertical lifting and positioning, it is very easy to cause the section to deform and collapse, affecting the construction accuracy and construction safety of the stern section. Therefore, the existing vertical construction method is not suitable for the construction of the stern section without the stern tube sleeve. It is urgent to provide a new stern section construction method for building the stern section without the stern tube sleeve to improve the construction accuracy and construction safety. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a method for constructing a stern section without a stern tube sleeve, which transforms the vertical construction mode adopted by the traditional bow section into a side construction mode. While reducing the amount of high-altitude operations, it overcomes the defect that during vertical construction, due to the lack of a stern tube sleeve in the stern section, the stern steel casting lacks support during lifting and positioning, resulting in the section being extremely easy to deform and collapse, thereby improving the construction accuracy and construction safety of the stern section.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a method for constructing a stern section without a stern tube sleeve, wherein the stern section without a stern tube sleeve is constructed sideways with the left side of the section as the base surface, and the construction method comprises:

[0006] S1. Build a curved tire frame, lay the port side outer plate, and complete the tire positioning of the stern steel casting; the curved tire frame is used to support the stern steel casting and the port side outer plate;

[0007] S2. Mark the platform installation line and rib installation line on the port side outer plate, and install the lower rib, left rib and upper rib of each platform and each rib;

[0008] S3, hoisting the bow steel castings;

[0009] S4. Arrange a bow pole and a stern pole at the bow and stern ends of the curved frame respectively, and pull a steel wire rope between the bow pole and the stern pole as the center line of the shaft hole of the stern section;

[0010] S5. Using the steel wire rope as a reference, adjust the relative positions of the bow steel casting and the stern steel casting so that the axial center lines of the bow steel casting and the stern steel casting coincide with each other; then, complete the positioning welding of the bow steel casting and the stern steel casting;

[0011] S6. Install and weld the right center ribs and the center ribs of the stern column, and ensure the horizontality of the center ribs of the stern column;

[0012] S7. Lift and lay the starboard outer plate, and weld the starboard outer plate to the keel in the stern column and the stern steel casting;

[0013] S8. Turn the entire segment over onto the support seat so that the starboard outer plate contacts the support seat, completing the welding of the starboard outer plate and the internal structure.

[0014] Preferably, the curved surface tire frame includes a template frame, and the template frame includes a plurality of transverse template frames and a plurality of longitudinal template frames; the transverse template frame includes a transversely arranged mold line template and a plurality of pillars arranged along the transverse direction; the longitudinal template frame includes a longitudinally arranged mold line template and a plurality of pillars arranged along the longitudinal direction; the transverse template frame and the longitudinal template frame cooperate to ensure that the port side outer plate can have a good line shape.

[0015] Preferably, the method for constructing a curved tire frame comprises the following steps:

[0016] S11. Determine the transverse template position line and the longitudinal template position line according to the characteristics of the stern section; cut the stern section along each template position line to obtain a cross-sectional view of each template frame; the template frame cross-sectional view includes the contour line of the mold line template, the horizontal center line, the tire frame vertical positioning line, the support center line, the tire frame ground line and the horizontal reference line;

[0017] S12. Add template seam lines to the profile templates in the cross-sectional views of each formwork support to split one profile template into multiple small templates, and mark the positioning waterlines of each small template and the longitudinal section lines of at least two small templates to obtain the design drawings of each formwork support; the determination basis of the positioning waterlines on each small template includes the centerlines of the struts; the determination method of the longitudinal section lines includes: taking the horizontal reference line as the reference, adding multiple auxiliary reference lines in the cross-sectional view of the formwork support, and each auxiliary reference line is located between the horizontal reference line and the horizontal centerline; according to the positions of each reference line, mark the longitudinal section lines of at least two small templates on the profile template, and at least one small template among adjacent two small templates has a longitudinal section line;

[0018] S13. According to the design drawings of each formwork support, cut and manufacture each strut and each small template of the corresponding formwork support, and mark the corresponding positioning waterlines and longitudinal section lines on the small templates;

[0019] S14. According to the corresponding relationship between the positioning waterlines, longitudinal section lines on each small template and the centerlines of each strut and each reference line, perform small assembly and installation of the struts and small templates in the same formwork support to obtain each formwork support, and hoist each formwork support to the ground of the jig according to the corresponding formwork position line and the corresponding jig vertical positioning line to form a formwork jig.

[0020] Preferably, the curved surface jig further includes a strut-type jig, which is used to support the idle area of the port outer plate to further ensure the line accuracy of the port outer plate.

[0021] Preferably, when manufacturing the outer plate, a shrinkage compensation value is added to the transverse plate seam lines at the bow of the port outer plate and the starboard outer plate to resist the shrinkage deformation generated during the welding of the outer plate and the bow floor.

[0022] Preferably, for the transverse formwork support near the bow of the section, when manufacturing the profile template, pre-deformation is required for the profile template to avoid the upward warping during the splicing of the profile template and the welding with the strut, which affects the subsequent laying accuracy of the outer plate.

[0023] Preferably, the determination basis of the positioning waterlines on each small template includes the jig vertical positioning line.

[0024] Preferably, the distance between adjacent two reference lines is equal, which reduces the subsequent scribing difficulty.

[0025] As above, a construction method for a stern section without a stern tube sleeve of the present invention has the following beneficial effects:

[0026] When constructing the bow part section without a stern tube sleeve, the present invention adopts a side construction mode to replace the traditional vertical construction mode, which not only reduces a large amount of high-altitude operations and the construction difficulty, but also avoids the problems of sectional deformation and collapse caused by the hoisting of stern cast steel parts, improves the sectional construction safety and sectional construction accuracy, and effectively shortens the shipbuilding time. Brief Description of the Drawings

[0027] Figure 1 It is a right view of the stern part section of a ship without a stern tube sleeve.

[0028] Figure 2 It is a cross-sectional view of the formwork support for the formwork position line at A.

[0029] Figure 3 It is a cross-sectional view of the formwork support for the formwork position line at B.

[0030] Figure 4 It is a cross-sectional view of the formwork support for the formwork position line at C.

[0031] Figure 5 It is a cross-sectional view of the formwork support for the formwork position line at D.

[0032] Figure 6 It is a cross-sectional view of the formwork support for the formwork position line at E.

[0033] Figure 7 It is a cross-sectional view of the formwork support for the formwork position line at F.

[0034] Figure 8 It is a cross-sectional view of the formwork support for the formwork position line at G.

[0035] Figure 9 It is a design drawing of the formwork support for the formwork position line at E.

[0036] Figure 10 For Figure 9 Schematic diagram of the medium line formwork.

[0037] Figure 11 For Figure 9 Schematic diagram of the pre-placement of reverse deformation on the small formwork at the rightmost end of the medium line formwork.

[0038] Figure 12 It is to obtain each small formwork by processing at the formwork position line at E.

[0039] Figure 13 It is a hoisting schematic diagram of each formwork support.

[0040] Figure 14 It is a shrinkage compensation schematic diagram of the bow outer plate.

[0041] Figure 15 It is a rib plate splitting schematic diagram.

[0042] Figure 16 Schematic diagram for building the stern section

[0043] Figure 17 Diagram of the overturned state of the stern section

[0044] Description of the reference numerals in the drawings

[0045] Stern cast steel part 1, outer plate 2, transverse plate seam line 2a, longitudinal plate seam line 2b, vertical positioning line of the jig 3, horizontal center line 4, ground line of the jig 5, horizontal reference line 6a, auxiliary reference line 6b, profile template 7, template joint line 7a, positioning water line 7b, longitudinal section line 7c, center line of the pillar 8, center keel of the stern post 9, lower rib plate 10a, left middle rib plate 10b, upper rib plate 10c, right middle rib plate 10d, bow cast steel part 11, bow benchmark 12a, stern benchmark 12b, support seat 13. Detailed implementation manners

[0046] The following specific embodiments 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.

[0047] Please refer to Figures 1 to 17 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present invention.

[0048] The present invention provides a method for building a stern section without a stern tube sleeve. The stern section without a stern tube sleeve is side-built with the left side of the section as the base surface. The method includes:

[0049] S1. Build a curved surface jig, lay the starboard outer plate, and then complete the positioning of the stern cast steel part on the jig; the curved surface jig is used to support the stern cast steel part 1 and the starboard outer plate;

[0050] Since the left side line shape of the stern section without a stern tube sleeve changes in complexity, the curved surface tire frame of this embodiment includes a template tire frame; the template tire frame includes a plurality of transverse template frames arranged at intervals and a plurality of longitudinal template frames arranged at intervals; the transverse template frame includes a mold line template 7 arranged in the transverse direction and a plurality of pillars supporting the mold line template 7, and the longitudinal template frame includes a mold line template 7 arranged in the longitudinal direction and a plurality of pillars supporting the mold line template 7, and the upper surface of each mold line template 7 cooperates to form a tire frame working surface that fits the left side line shape of the stern section, so as to better support the stern section and ensure that the constructed stern section has a good line shape; wherein the position line of the transverse template frame is the transverse template position line, and the position line of the longitudinal template frame is the longitudinal template position line; in another embodiment, the curved surface tire frame also includes a pillar-type tire frame (not shown in the figure), which is used to support the idle area of ​​the port side outer plate in the stern section, and the cooperation between the template tire frame and the pillar-type tire frame can further improve the support stability of the stern section and improve the external line shape accuracy of the stern section.

[0051] Specifically, the steps of building the template frame include:

[0052] S11. According to the characteristics of the stern section, determine the transverse template position lines A to E and the longitudinal template position lines F to G; cut the stern section along each template position line to obtain a cross-sectional view of each template frame; the template frame cross-sectional view includes the contour line of the mold line template 7, the horizontal center line 4, the tire frame vertical positioning line 3, the support center line 8, the tire frame ground line 5 and the horizontal reference line 6a;

[0053] Figure 1 It is a right view of the stern section without the stern tube sleeve, on which the ship's baseline, the center line of the shaft hole, the stern casting 1 and the outer plate 2 are marked; Figure 1The center line of the shaft hole in the ship is taken as the X-axis, the ship height direction is taken as the Z-axis, and then the Y-axis direction is determined to establish the stern section coordinate system; the template position lines A~G are determined according to the characteristics of the stern section and the requirements of the tire frame design. When determining the template position lines C~E, the distance from the template position line C to the transverse plate seam line 2a located at the stern of the outer plate 2 is required to be 80mm~150mm, the distance from the template position line E to the transverse plate seam line 2a located at the bow of the outer plate 2 is required to be 80mm~150mm, the template position line D is as close as possible to the middle position between the template position lines C and E, and the minimum distance from the template position line D to the transverse plate seam line 2a is 80mm~150mm; when determining the template position lines F~G, the distance from the template position line F to the longitudinal plate seam line 2b located at the upper mouth of the outer plate 2 is 8 0mm~150mm, the template position line G is as close as possible to the middle position between the intersection of the stern column middle rib 9 and the template position line D and the template position line F, and the minimum distance from the template position line G to the longitudinal plate seam 2b on the outer plate 2 is 80mm~150mm, so as to ensure the supporting stability of the outer plate 2; the distance from the template position line B to the transverse plate seam 2a located at the stern of the outer plate 2 is 80mm~150mm, and the position of the template position line A can be determined according to the length of the stern steel casting 1 and the position of the template position line B, so as to ensure the supporting stability of the stern steel casting 1.

[0054] because Figure 1 The relative position relationship between the A~E template position line and the transverse plate seam line 2a of the bow of the outer plate 2, the center line of the shaft hole, the relative position relationship between the F~G template position line and the ship baseline are all determined based on the stern section coordinate system and can be directly measured.

[0055] according to Figure 1 The position of each template position line in the middle is cut to obtain a section view at each template position line, and the section view includes the outer edge line of the outer plate, the horizontal center line 4 and the vertical positioning line 3 of the tire frame; wherein, the horizontal center line 4 at the template position line AE is the transverse center line, which is the intersection line of the middle longitudinal section of the stern section (i.e., the longitudinal section passing through the center line of the shaft hole) and the corresponding section plane; the vertical positioning line 3 of the tire frame at the template position line AE is a preset distance baseline, which intersects the preset distance baseline with the transverse center line at right angles, and the distance between the preset distance baseline and the ship baseline is equal to the distance between the center line of the shaft hole and the ship baseline; the horizontal center line 4 at the template position lines F~G is the longitudinal center line, which is the intersection line of the middle longitudinal section of the stern section and the corresponding section plane; the vertical positioning line of the tire frame at the template position lines F~G is the projection of the transverse plate seam line 2a of the bow of the outer plate 2 on the corresponding section plane.

[0056] Call the outer plate outer edge line, the jig vertical positioning line 3, and the horizontal center line 4 in each sectional view. Take the outer plate outer edge line as the upper edge line of the corresponding profile template 7, draw the lower edge line of the corresponding profile template 7, determine the outline line of each profile template 7, and draw the jig ground line 5, the horizontal reference line 6a, and the center lines 8 of each support column to obtain the transverse sectional view of each template frame, as Figures 2 to 8 shown.

[0057] The lower edge line of the profile template 7 is obtained by offsetting the upper edge line of the profile template 7 outward in the normal direction by a preset thickness value. The offset thickness value is comprehensively determined by the strength, stiffness, and cost budget of the profile template 7, and there is no limitation on this. In this embodiment, it is preferably set that the offset thickness value is 300 mm.

[0058] From Figures 2 to 8 it can be seen that the lowest point of the upper edge line of the profile template is on the template frame at E, and the distance from the lowest point of the working surface of the jig (i.e., the lowest point of the outer plate) to the jig ground is required to be 600 mm to 800 mm. In this embodiment, it is preferably set to 640 mm. Based on this, the jig ground line 5 can be drawn.

[0059] Since the height position of the horizontal reference line 6a is determined by the height of a person squatting for welding, it is generally set to 0.5 m to 0.8 m. In this embodiment, it is preferably set to 0.7 m, that is, the horizontal reference line 6a is the 700 mm horizontal reference line.

[0060] The positions of the center lines 8 of each support column in the transverse sectional view of the template frame are determined according to the shape and size of the profile template 7 and the position of the jig vertical positioning line 3, as long as it is ensured that the support columns set at the center lines 8 of the support columns can stably support. The height of the support column is the distance from the intersection of the corresponding support column center line 8 and the upper edge line of the profile template 7 to the jig ground line 5; in this embodiment, in the transverse sectional view of the template frame corresponding to the longitudinal template frame, there is a support column center line 8 that coincides with the jig vertical positioning line 3, which is convenient for subsequent positioning and installation.

[0061] S12. Add template joint lines 7a to the profile template 7 in each transverse sectional view of the template frame to split one profile template into multiple small templates, and draw the positioning water lines 7b of each small template and at least two longitudinal sectional lines 7c of the small templates to obtain the design drawings of each template frame; the determination basis of the positioning water lines 7b on each small template includes the support column center line 8; the determination method of the longitudinal sectional lines 7c includes: taking the horizontal reference line 6a as the reference, adding multiple auxiliary reference lines 6b in the transverse sectional view of the template frame, and each auxiliary reference line 6b is located between the horizontal reference line 6a and the horizontal center line 4; according to the positions of each reference line, draw at least two longitudinal sectional lines 7c of the small templates on the profile template, and at least one small template among adjacent two small templates has a longitudinal sectional line 7c;

[0062] When adding the template seam line 7a to the section line template 7, it is necessary to ensure that the length of the upper edge line of each small template is about 1500 mm. The added template seam line 7a does not intersect with the center line 8 of the support column and the vertical positioning line 3 of the jig, and at least one center line 8 of the support column passes through each small template.

[0063] When determining the positioning water line 7b, only by obtaining the projection lines of the center lines 8 of the support columns on the section line template 7 can the positions of the positioning water lines 7b on each small template be determined.

[0064] The determination basis of the positioning water line 7b on each small template also includes the vertical positioning line 3 of the jig, that is, according to the projection line of the vertical positioning line 3 of the jig on the section line template 7, an additional positioning water line 7b can be determined on one small template.

[0065] When determining the position of the auxiliary reference line 6b, it is only necessary to ensure that at least one reference line passes through one of the adjacent two small templates; in this embodiment, the distance between adjacent two reference lines is preferably set to be equal to reduce the scribing difficulty of the subsequent reference lines.

[0066] The design drawing of the template frame at E determined by the above method is as Figure 9 shown, Figure 10 is Figure 9 a schematic diagram of the medium section line template 7.

[0067] Through analysis, it is found that there is welding deformation in the section line template 7 at E, resulting in the right end of the section line template 7 at this place tilting upward. Therefore, in the design drawing of the template frame at E, it is necessary to pre-set anti-deformation on the small template at the rightmost end of the section line template 7 (that is, the small template at the upper opening) to ensure that the template frame at E after welding meets the requirements; the contour lines of this small template before and after adding anti-deformation are as Figure 11 shown.

[0068] S13. According to the design drawings of each template frame, process each small template and each support column, and mark the corresponding positioning water lines and longitudinal section lines on the small templates (the processed small templates at E are as Figure 12 shown);

[0069] S14. According to the corresponding relationship between the positioning water lines 7b, longitudinal section lines 7c on each small template and the center lines 8 of the support columns and each reference line, assemble and install the support columns and small templates in the same template frame in a small group to obtain each template frame, and hoist each template frame to the jig ground according to the corresponding template position line and the corresponding vertical positioning line of the jig (as Figure 13 shown), to form a template jig.

[0070] Due to the shrinkage deformation during welding of the transverse plate seam 2a of the port outer plate at the bow, when manufacturing the port outer plate, a shrinkage compensation value needs to be added from top to bottom to the transverse plate seam of the outer plate at the bow of the port outer plate (as Figure 14 shown) to ensure that the port outer plate after welding meets the requirements.

[0071] S2. Mark the platform installation line and the rib plate installation line on the port outer plate, and install the lower rib plate, the left rib plate, and the upper rib plate in each platform and each rib plate;

[0072] As Figure 15 shown, when manufacturing the rib plate, it needs to be split into a lower rib plate 10a, a left middle rib plate 10b, an upper rib plate 10c, and a right middle rib plate 10d to facilitate the subsequent installation of the bow steel castings.

[0073] S3. Hoist the bow steel casting 11;

[0074] S4. As Figure 16 shown, arrange a bow benchmark 12a and a stern benchmark 12b at both the bow and stern ends of the curved jig, and pull a steel wire rope between the bow benchmark 12a and the stern benchmark 12b as the axis hole center line of the stern section;

[0075] S5. As Figure 16 shown, with the steel wire rope as the reference, adjust the relative positions of the bow steel casting 11 and the stern steel casting 1 so that the axial center lines of the bow steel casting 11 and the stern steel casting 1 coincide; then, complete the positioning welding of the bow steel casting 11 and the stern steel casting 1;

[0076] S6. As Figure 16 shown, install and weld each right middle rib plate 10d and the center keel 9 of the stern post, and ensure the levelness of the center keel 9 of the stern post;

[0077] The center keel 9 of the stern post is obtained by numerical control cutting and is very prone to cutting deformation. Therefore, a number of precision control points need to be arranged at equal intervals on the upper edge line of the center keel 9 of the stern post obtained by cutting to facilitate detecting whether the curvature of the center keel 9 of the stern post meets the requirements through a total station. If it does not meet the requirements, thermal straightening is required, and the thermal straightening uses the triangular heating method.

[0078] S7. Hoist and lay the starboard outer plate, and weld the starboard outer plate to the center keel 9 of the stern post and the stern steel casting 1;

[0079] When manufacturing the starboard outer plate, a shrinkage compensation value also needs to be added, and the adding position and the adding amount are the same as those of the port outer plate.

[0080] S8. As Figure 17 shown, turn the entire section over to the support seat 12 so that the starboard outer plate contacts the support seat 12, and complete the welding of the starboard outer plate and the internal structure.

[0081] In summary, according to the characteristics of the stern part section without a stern tube sleeve, the present invention modifies the traditional vertical construction mode to a side construction mode, so as to overcome the deficiency that during the vertical installation state, when hoisting the stern cast steel parts, due to the lack of support from the stern tube sleeve below, it is extremely easy to cause sectional deformation and collapse, and improve the sectional construction accuracy; at the same time, reduce the amount of high-altitude operations during sectional construction and improve operation safety; in addition, the template jig used in the curved jig for side construction can take into account both the transverse and longitudinal line types of the outer plate of the stern section, ensure that the external line type of the outer plate meets the requirements, and further improve the construction accuracy; finally, the present invention pre-sets anti-deformation on the jig and the outer plate during the design stage to ensure that the jig and the outer plate after welding meet the accuracy requirements.

[0082] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used 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 completed 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 building method for the stern part section without a stern tube sleeve, characterized in that The stern section without stern tube is built sideways with the left side of the section as the base surface; the building method includes: S1, build a curved tire frame, lay the port side outer plate, and then complete the tire positioning of the stern steel casting; the curved tire frame is used to support the stern steel casting and the port side outer plate; S2. Mark the platform installation line and rib installation line on the port side outer plate, and install the lower rib, left rib and upper rib of each platform and each rib; S3, hoisting the bow steel castings; S4. Arrange a bow pole and a stern pole at the bow and stern ends of the curved frame respectively, and pull a steel wire rope between the bow pole and the stern pole as the center line of the shaft hole of the stern section; S5. Using the steel wire rope as a reference, adjust the relative positions of the bow steel casting and the stern steel casting so that the axial center lines of the bow steel casting and the stern steel casting coincide with each other; then, complete the positioning welding of the bow steel casting and the stern steel casting; S6. Install and weld the right center ribs and the center ribs of the stern column, and ensure the horizontality of the center ribs of the stern column; S7. Lift and lay the starboard outer plate, and weld the starboard outer plate to the keel in the stern column and the stern steel casting; S8. Turn the entire segment over onto the support seat so that the starboard outer plate contacts the support seat, completing the welding of the starboard outer plate and the internal structure; The curved surface tire frame includes a template frame, and the template frame includes a plurality of transverse template frames and a plurality of longitudinal template frames; the transverse template frame includes a transversely arranged mold line template and a plurality of pillars for supporting the mold line template; the longitudinal template frame includes a longitudinally arranged mold line template and a plurality of pillars for supporting the mold line template; The method for constructing the template frame comprises the following steps: S11. Determine the transverse template position line and the longitudinal template position line according to the characteristics of the stern section; cut the stern section along each template position line to obtain a cross-sectional view of each template frame; the template frame cross-sectional view includes the contour line of the mold line template, the horizontal center line, the tire frame vertical positioning line, the support center line, the tire frame ground line and the horizontal reference line; S12, adding template seam lines to the mold line template in the cross-sectional view of each template frame to split a mold line template into multiple small templates, and marking the positioning waterline of each small template and the longitudinal section line of at least two small templates to obtain the design drawings of each template frame; the basis for determining the positioning waterline on each small template includes the center line of the pillar; the method for determining the longitudinal section line includes: adding multiple auxiliary reference lines in the cross-sectional view of the template frame based on the horizontal reference line, and each auxiliary reference line is located between the horizontal reference line and the horizontal center line; according to the position of each reference line, marking the longitudinal section line of at least two small templates on the mold line template, and at least one of the two adjacent small templates has a longitudinal section line; S13, according to the design drawings of each formwork frame, cut and make the corresponding pillars and small formworks of the formwork frame, and mark the corresponding positioning waterline and longitudinal section line on the small formwork; S14. According to the corresponding relationships between the positioning waterlines and longitudinal section lines on each small template and the centerlines of each support column and each reference line, the support columns and small templates in the same template frame are assembled and installed in a small group to obtain each template frame, and each template frame is hoisted onto the ground of the jig according to the corresponding template position line and the corresponding jig vertical positioning line to form a template jig.

2. The construction method of a tail shaft tube-free stern partial section according to claim 1, characterized in that, The curved surface jig further includes a column type jig, which is used to support the idle area of the port outer plate.

3. The building method of a stern part section without a stern tube sleeve according to claim 1, characterized in that When manufacturing the outer plate, a shrinkage compensation value needs to be added to the transverse plate sewing lines at the bows of the port outer plate and the starboard outer plate.

4. A method for building a stern part section without a stern tube sleeve, according to claim 1, characterized in that, For the transverse template frames near the bow of the section, when manufacturing the profile templates, pre-deformation needs to be applied to the profile templates.

5. A method for building the stern part of a stern tube-free ship, characterized in that, The determination basis of the positioning waterlines on each small template includes the jig vertical positioning line.

6. The construction method of a stern tube-free stern partial section according to claim 1, characterized in that The distances between adjacent two reference lines are equal.

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