A welding method for a sunken ship salvage launcher

Abstract

A welding method for a sunken ship salvage launch rack. First, lay out the welding tooling and control the dimensional error of the positioning structure of the welding tooling within 0.5 mm. Lift the inner arc plate, outer arc plate, and side flat plate of the launch rack sub-component onto the welding tooling and fix them through the positioning structure. Use temporarily welded inclined support members to provide vertical positioning constraints for the inner arc plate and outer arc plate, and after checking the perpendicularity, weld the inner arc plate, outer arc plate, and side flat plate together. After welding, cut off the inclined support members and conduct a dimensional re-inspection to complete the welding of the launch rack sub-component. This method is simple and efficient in operation, can effectively achieve the welding of a large sunken ship salvage launch rack, and ensure the dimensional accuracy of the internal track space.

Description

Technical Field

[0001] The invention belongs to the field of shipwreck salvage, and in particular relates to a welding method for a shipwreck salvage launching frame. Background Art

[0002] The complete salvage of a large ancient shipwreck is a relatively complex and difficult task in the shipwreck salvage industry. The ancient shipwrecks that need to be salvaged are usually buried in the seabed mud and have fragile structures. While salvaging, it is also necessary to take into account the protection of the cultural relics on the ship. In the salvage project of the "Yangtze River Estuary No. 2" shipwreck, a new set of shipwreck salvage equipment was developed. The equipment uses an arc beam with a diameter of about 20 meters to pass through the silted seabed sediments from under the shipwreck, and the shipwreck and the surrounding sediments are caught and salvaged. During the salvage process, the arc beam needs to be guided and driven by a launcher to complete the excavation operation in the seabed. The structural accuracy of the launcher is crucial to the salvage operation.

[0003] The launcher itself is semi-arc-shaped, and is assembled by bolts from four groove-shaped sub-components. The interior includes a rectangular track space to accommodate the arc-shaped beam. The inner wall of the launcher is also provided with multiple arc rack components and roller grooves to provide drive and guidance for the arc-shaped beam. The welding and assembly process of the sub-components of the launcher needs to ensure that the size of the track space formed after assembly strictly matches the arc-shaped beam, but existing welding technology is difficult to achieve high-precision welding of such large-sized groove parts. Summary of the invention

[0004] The object of the present invention is to provide a shipwreck salvage launcher and a welding method, so that the size of the internal track space of the launcher assembled from multiple sub-components is strictly matched with the arc beam, and the size error does not exceed 0.5mm.

[0005] According to one aspect of an embodiment of the present invention, a method for welding a launch frame for salvaging a sunken ship is provided, the method comprising the following steps:

[0006] a) Setting a welding fixture, the welding fixture comprising a rotation center, with the rotation center as the base point, laying a plurality of support beams radially, the support beams being provided with an inner positioning structure and an outer positioning structure, the lengths of the inner positioning structure and the outer positioning structure to the rotation center being equal to the radii of the inner arc plate and the outer arc plate of the launcher, respectively, and the dimensional error being no more than 0.5 mm;

[0007] b) Lift and install the inner arc plate, outer arc plate and side flat plate of a sub-component of the launch rack on the support beam of the welding tooling. Horizontally lift and lay the side flat plate on the support beam, vertically lift and erect the inner arc plate and outer arc plate on the support beam, and use the inner positioning structure and outer positioning structure to position the inner arc plate and outer arc plate. Set a flange positioning fixture on the support beam to position the flange parts on the inner arc plate and outer arc plate, so that the drop between the flange parts of the inner arc plate and the outer arc plate does not exceed 0.5 mm;

[0008] c) Carry out local welding connections between the inner arc plate, outer arc plate and the side flat plate respectively, and weld a plurality of inclined support members between the inner arc plate and the side flat plate, and between the outer arc plate and the side flat plate respectively, so as to provide vertical positioning constraints for the inner arc plate and the outer arc plate;

[0009] d) Inspect the perpendicularity of the inner arc plate and the outer arc plate, control the perpendicularity accuracy within 2 mm, and weld the inner arc plate, outer arc plate and the side flat plate together as a whole respectively to obtain a blank part of the launch rack sub-component with a trough-shaped cross-section. The inner arc plate, outer arc plate and side flat plate jointly enclose a part of the internal track space of the launch rack;

[0010] e) Inspect the roundness of the outer side of the inner arc plate and the inner side of the outer arc plate of the launch rack sub-component blank part and the flatness of the side flat plate, control the accuracy within 0.5 mm, and cut and remove the inclined support members to obtain the launch rack sub-component;

[0011] f) Repeat the steps b)-e) until the welding of all launch rack sub-components is completed.

[0012] The above method completes the welding and assembly between different parts of the launch rack through the same set of welding tooling, ensuring the consistency of dimensional parameters such as roundness between different sub-components; by setting temporary inclined support members between the inner arc plate, outer arc plate and side flat plate, ensuring the perpendicular relationship between the inner arc plate, outer arc plate and side flat plate during the welding process; detecting the flatness and roundness of the launch rack track space during and after the welding process to ensure that the dimensional accuracy of the launch rack sub-component and the finished launch rack can be strictly matched with the arc beam.

[0013] Further, in the step a), the inner positioning structure and the outer positioning structure are configured as positioning grooves. In the step b), the inner arc plate and the outer arc plate are respectively clamped in the positioning grooves, so that the outer surface of the inner arc plate and the inner surface of the outer arc plate are respectively abutted against the side flat plate. The positioning grooves use the outer side surface of the inner arc plate and the inner side surface of the outer arc plate as the positioning reference to ensure the dimensional accuracy of the internal track space.

[0014] Further, in step c), the plurality of inclined support members are arranged at an interval of 2 m. The inclined support members provide uniform support force for the inner arc plate and the outer arc plate.

[0015] Further, in step c), the inclined support members are configured as rectangular steel sections, and are obliquely welded between the inner arc plate or the outer arc plate and the side flat plate. One end of the inclined support member overlaps 100 mm - 200 mm below the top end of the inner arc plate or the outer arc plate, and the other end abuts against the surface of the side flat plate 100 mm - 200 mm away from the edge. By reasonably setting the structure and connection position of the inclined support members, the inclined support members can better provide support for the inner arc plate and the outer arc plate, and at the same time facilitate the welding operation.

[0016] Further, in step d), the perpendicularity accuracy of the inner arc plate and the outer arc plate is controlled within 1 mm. Optimizing the perpendicularity accuracy of the inner arc plate and the outer arc plate within 1 mm is beneficial to the dimensional matching during the subsequent assembly of sub-components.

[0017] Further, in step d), it further includes the step of welding the launcher accessories on the inner arc plate, the outer arc plate and the side flat plate. The launcher accessories include an outer roller groove plate, an inner roller groove plate and a side roller groove plate. The roller groove plates are used to machine roller grooves to provide direction guidance for the launch of the arc beam.

[0018] Further, the welding method of the outer roller groove plate, the inner roller groove plate and the side roller groove plate is to open grooves on both sides and weld in the form of fillet welds. The fillet welds with grooves opened on both sides are convenient for operation in the grooves, and have high welding strength and accuracy.

[0019] Further, in step d), the launcher accessories further include stiffening rib plates, and the stiffening rib plates form a grid-like strengthening structure on the surface of the launcher. The stiffening rib plates can improve the overall stiffness of the launcher, improve the dimensional accuracy, and at the same time prevent the launcher from deforming during the hoisting process.

[0020] Further, in step e), the inclined support members are cut one by one using an angle grinder or a flame cutting machine, and a grinding process is included after cutting. Cutting the inclined support beams facilitates the subsequent assembly of the launcher and the loading of the arc beam.

[0021] Further, this welding method further includes step g), assembling each sub-component of the launcher using bolts to obtain a finished launcher component, and detecting the circularity, perpendicularity and flatness of the finished launcher component. Conducting an overall inspection of the finished launcher to ensure that the dimensional parameters of the finished product meet the design requirements. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of a sunken ship salvage launcher in an embodiment;

[0023] Figure 2 Schematic cross-sectional structure diagram of a wreck salvage launch rack in an embodiment;

[0024] Figure 3 Schematic structure diagram of a welding fixture for a wreck salvage launch rack in an embodiment.

[0025] The purpose of the above-mentioned drawings is to make a detailed description of the present invention so that those skilled in the art can understand the technical concept of the present invention, rather than aiming to limit the present invention. For the sake of brevity, the above-mentioned drawings only schematically show the structures related to the technical features of the present invention, and do not strictly draw the complete structure and all details according to the actual proportion. Specific embodiments

[0026] The present invention will be further described in detail below through specific embodiments in conjunction with the drawings.

[0027] The mention of "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of this article. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive independent or alternative embodiments. Those skilled in the art should be able to understand that the embodiments in this article can be combined with other embodiments without structural conflicts.

[0028] In the description of this article, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a movable connection, a fixed connection or integrated. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific situations.

[0029] In the description of this article, terms indicating orientation or positional relationships such as "upper", "lower", "left", "right", "radial", "circumferential", "height", "length", "width" are intended to accurately describe the embodiment and simplify the description, rather than limiting the parts or structures involved to have a specific orientation, be installed or operated in a specific orientation, and should not be understood as a limitation to the embodiments in this article.

[0030] In the description of this article, terms such as "first", "second" are only used to distinguish different objects, and cannot be understood as indicating relative importance or limiting the quantity, specific order or primary-secondary relationship of the described technical features. In the description of this article, the meaning of "multiple" is at least two.

[0031] An embodiment of the present invention provides a welding method for a wreck salvage launch rack, and the structure of the launch rack is as Figure 1As shown, it includes a first sub-component 1a, a second sub-component 1b, a third sub-component 1c, and a fourth sub-component 1d with a grooved cross-section. Each of the four sub-components is arc-shaped and is connected to each other through a first flange portion 11a and a second flange portion 11b by bolts, surrounding to form an internal track space 3 of the launch rack, which is used to accommodate the arc-shaped beam for sunken ship salvage and provide drive and guidance for the arc-shaped beam to tunnel under the sea. The diameter of the arc-shaped beam for sunken ship salvage is about 20 meters. During the salvage process, multiple arc-shaped beams need to be driven into the seabed side by side in sequence to make the adjacent arc-shaped beams fit tightly. Therefore, the internal track space 3 of the launch rack for sunken ship salvage needs to have very high dimensional accuracy, and the existing welding process is difficult to achieve high-precision welding of the grooved sub-components of the launch rack for sunken ship salvage. The welding method provided by the embodiment of the present invention includes the following steps:

[0032] First, set up a welding tooling 2 as shown in Figure 3 When setting up the welding tooling, first calibrate the rotation center 21 as the measurement reference for the entire welding tooling 2. The welding tooling 2 and the launch rack for sunken ship salvage have the side close to the rotation center 21 as the inner side and the side far from the rotation center 21 as the outer side. Lay multiple radially arranged support beams 27 with the rotation center 21 as the base point. Inner positioning structures 24a and outer positioning structures 24b are respectively arranged on the support beams 27. The distance from the inner positioning structure 24a to the rotation center 21 is equal to the radius of the inner arc plate of the launch rack for sunken ship salvage, and the distance from the outer positioning structure 24b to the rotation center 21 is equal to the radius of the outer arc plate of the launch rack for sunken ship salvage, with the dimensional error controlled within 0.5 mm. An inner top tooling 25 and an outer top tooling 26 are respectively arranged on the inner side of the inner positioning structure 24a and the outer side of the outer positioning structure 24b, which are used to fix the sub-components to be welded and adjust their positions. Each support beam 27 is connected into a whole through an arc-shaped inner strengthening beam 22 and an outer strengthening beam 23. The inner strengthening beam 22 and the outer strengthening beam 23 are relatively fixed to the ground to keep the relative position relationship between the welding tooling 2 and the rotation center 21 unchanged.

[0033] Next, in combination with Figure 2, hoist the inner arc plate 12 and the outer arc plate 13 of the first sub-component 1a onto the welding fixture 2, and make them respectively snap onto the inner positioning structure 24a and the outer positioning structure 24b. In a preferred embodiment, the inner positioning structure 24a and the outer positioning structure 24b are configured as positioning grooves, so that the inner arc plate 12 and the outer arc plate 13 can be directly snapped into the card slots. Hoist the side flat plate 14 of the first sub-component 1a onto the welding fixture 2 and place it between the inner arc plate 12 and the outer arc plate 13. Use the inner top fixture 25 and the outer top fixture 26 to respectively press the inner arc plate 12 and the outer arc plate 13 tightly and abut against both sides of the side flat plate 14. Set two flange positioning jigs (not shown) on each support beam 27, and use these two flange positioning jigs to respectively clamp and position the second flange parts 11b of the inner arc plate 12 and the outer arc plate 13. The heights of the flange positioning jigs protruding from the support beam 27 are equal, so as to control the height difference between the second flange parts 11b of the inner arc plate 12 and the outer arc plate 13 not to exceed 0.5 mm, so as to ensure that the second flange parts 11b between the sub-components of each launch rack can be spliced together after welding is completed.

[0034] Then, perform local spot welding between the inner arc plate 12 and the side flat plate 14 and between the outer arc plate 13 and the side flat plate 14 respectively to achieve preliminary fixation, and weld a plurality of inclined support members 15 to fix the positions of the inner arc plate 12 and the outer arc plate 13, and the inclined support members 15 provide vertical positioning constraints for them. Among them, the inclined support members 15 are arranged at intervals of 2 m in the preferred embodiment; in an alternative embodiment, the inclined support members 15 are configured as rectangular steel sections, the top of which overlaps 100 mm - 200 mm below the top of the inner arc plate 12 or the outer arc plate 13, and the bottom is set 100 mm - 200 mm away from the surface of the side flat plate and the outer arc plate 13 or the inner arc plate 12.

[0035] Next, use a level and a three-dimensional laser detector to detect the circularity and vertical accuracy of the inner arc plate 12 and the outer arc plate 13. In a preferred embodiment, the vertical accuracy of the inner arc plate 12 and the outer arc plate 13 is controlled within 1 mm, and the circularity is controlled within 0.5 mm. After the dimensional accuracy inspection, perform local flame processing or mechanical correction on the areas with dimensional tolerances, and then fully weld the butt joints between the inner arc plate 12, the side flat plate 14 and the outer arc plate 13 together by laser welding or argon arc welding to obtain a blank of the first launch rack sub-component 1a with a trough-shaped cross-section. The area jointly surrounded by the inner arc plate 12, the outer arc plate 13 and the side flat plate 14 constitutes a part of the internal track space 3 of the launch rack. Subsequently, all the inclined support members 15 are removed. In a preferred embodiment, the inclined support members 15 are cut off one by one by a angle grinder or a flame cutting machine, and the section is polished after cutting.

[0036] After the blank of the first launch rack sub-component 1a is completed, in an optional embodiment, continue to weld the launch rack accessories on the surfaces of the inner arc plate 12, the outer arc plate 13, and the side flat plate 14. The launch rack accessories include the arc plate roller groove plates 17 provided on the surfaces of the inner arc plate 12 and the outer arc plate 13, and the side roller groove plates 18 provided on the side flat plate 14, which are used for subsequent machining of the launch rack roller grooves. Among them, the arc plate roller groove plates 17 include the inner roller groove plates (not shown) provided on the inner arc plate 12 and the outer roller groove plates provided on the outer arc plate 13. In a preferred embodiment, each roller groove plate is welded and fixed in a fillet welding form by opening grooves on both sides. In a preferred embodiment, the launch rack accessories further include a plurality of rib plates 16 provided on the inner side of the inner arc plate 12, the outer side of the outer arc plate 13, and the lower side of the side flat plate 14. These rib plates include outer longitudinal rib plates, inner longitudinal rib plates, and radial rib plates, and these rib plates intersect perpendicularly to form a grid-shaped strengthening structure on the surface of the launch rack 1a sub-component.

[0037] Finally, after all welding processes are completed, perform arc degree detection on the outer surface of the inner arc plate 12 and the inner surface of the outer arc plate 13 of the first launch rack sub-component 1a, and control the accuracy within 0.5 mm; perform levelness detection on the upper surface of the side flat plate 14, and control the accuracy within 0.5 mm. If the size exceeds the tolerance, rework is carried out by flame machining or mechanical correction.

[0038] Repeat the above process until the welding and processing of all four sub-components of the first sub-component 1a, the second sub-component 1b, the third sub-component 1c, and the fourth sub-component 1d of the launch rack are completed.

[0039] In a preferred embodiment, after all sub-components are welded, butt them together along the first flange portion 11a and the second flange portion 11b respectively and connect them into a whole using bolts. Use a level and a three-dimensional laser detector to recheck the dimensional accuracy of the internal track space 3 of the launch rack, and control the arc surface arc degree error not to exceed 0.5 mm, the perpendicularity error not to exceed 1 mm, and the flatness error not to exceed 0.5 mm.

[0040] The purpose of the above embodiments is to make a further detailed description of the present invention in combination with the drawings, so that those skilled in the art can understand the technical concept of the present invention. Within the scope of the claims of the present invention, optimizing or equivalently replacing the involved part structures or method steps, and combining the implementation manners in different embodiments without conflict in structure and principle all fall within the protection scope of the present invention.

Claims

1. A welding method for a sunken ship salvage launching rack, characterized in that, it includes the following steps: a) Set up a welding fixture. The welding fixture includes a rotation center, and multiple support beams are radially laid with the rotation center as the base point. An inner positioning structure and an outer positioning structure are arranged on the support beams. The lengths from the inner positioning structure and the outer positioning structure to the rotation center are respectively equal to the radii of the inner arc plate and the outer arc plate of the launching rack, and the dimensional error does not exceed 0.5 mm; b) Hoist the inner arc plate, outer arc plate and side flat plate of a sub-component of the launching rack onto the support beams of the welding fixture. Horizontally hoist and lay the side flat plate on the support beams, vertically hoist and erect the inner arc plate and the outer arc plate on the support beams, and use the inner positioning structure and the outer positioning structure to position the inner arc plate and the outer arc plate. Set up flange positioning jigs on the support beams to position the flange parts on the inner arc plate and the outer arc plate, so that the drop between the flange parts of the inner arc plate and the outer arc plate does not exceed 0.5 mm; c) Locally weld and connect the inner arc plate and the outer arc plate to the side flat plate respectively, and weld multiple inclined support members between the inner arc plate and the side flat plate and between the outer arc plate and the side flat plate respectively to provide vertical positioning constraints for the inner arc plate and the outer arc plate; d) Inspect the perpendicularity of the inner arc plate and the outer arc plate, control the perpendicularity accuracy within 2 mm, and weld the inner arc plate, the outer arc plate and the side flat plate together integrally to obtain a blank of a sub-component of the launching rack with a trough-shaped cross-section. The inner arc plate, the outer arc plate and the side flat plate jointly enclose a part of the internal track space of the launching rack; e) Inspect the roundness of the outer side of the inner arc plate and the inner side of the outer arc plate of the blank of the sub-component of the launching rack and the flatness of the side flat plate, control the accuracy within 0.5 mm, and cut and remove the inclined support members to obtain a sub-component of the launching rack; f) Repeat steps b)-e) until all sub-components of the launching rack are welded.

2. The welding method for a sunken ship salvage launching rack according to claim 1, characterized in that, in step a), the inner positioning structure and the outer positioning structure are configured as positioning grooves, and in step b), the inner arc plate and the outer arc plate are respectively clamped in the positioning grooves, so that the outer surface of the inner arc plate and the inner surface of the outer arc plate are respectively abutted against the side flat plate.

3. The welding method for a sunken ship salvage launching rack according to claim 1, characterized in that, in step c), the multiple inclined support members are arranged at an interval of 2 m.

4. The welding method for a sunken ship salvage launching rack according to claim 1 or 3, characterized in that, in step c), the inclined support members are configured as rectangular steel sections, and are obliquely welded between the inner arc plate or the outer arc plate and the side flat plate. One end of the inclined support member overlaps 100 mm - 200 mm below the top of the inner arc plate or the outer arc plate, and the other end abuts against the surface of the side flat plate 100 mm - 200 mm away from the edge.

5. The welding method for a sunken ship salvage launching rack according to claim 1, characterized in that, In the step d), the perpendicularity accuracy of the inner arc plate and the outer arc plate is controlled within 1 mm.

6. The welding method of the sunken ship salvage launching rack according to claim 1, characterized in that in the step d), it further includes the step of welding the launching rack accessories on the inner arc plate, the outer arc plate and the side flat plate, and the launching rack accessories include an outer roller groove plate, an inner roller groove plate and a side roller groove plate.

7. The welding method of the sunken ship salvage launching rack according to claim 6, characterized in that the welding method of the outer roller groove plate, the inner roller groove plate and the side roller groove plate is to open grooves on both sides and weld in the form of fillet welds.

8. The welding method of the sunken ship salvage launching rack according to claim 6, characterized in that in the step d), the launching rack accessories further include stiffening rib plates, and the stiffening rib plates form a grid-like strengthening structure on the surface of the launching rack.

9. The welding method of the sunken ship salvage launching rack according to claim 1, characterized in that in the step e), the inclined support members are cut off one by one by an angle grinder or a flame cutting machine, and a grinding process is also included after cutting.

10. The welding method of the sunken ship salvage launching rack according to claim 1, characterized in that it further includes a step g) of assembling each launching rack sub-component with bolts to obtain a finished launching rack component, and detecting the circularity, perpendicularity and flatness of the finished launching rack component.

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