A thin deck splicing device and splicing method for a ship

Abstract

The application provides a thin deck splicing device and method for ships, which comprises a jig, a steel platform, a pressing iron, a C-shaped clamp, a horse plate, a fixing tool, a steel wire rope and other components. When two thin decks are arranged in the longitudinal direction on the jig for splicing, the C-shaped clamp is used to clamp the outer side of the steel platform and the thin deck to form rigid fixation; the horse plate is used to clamp the angle steel column and the free edge to form rigid connection; the vertical part of the fixing tool penetrates the internal area of the thin deck, the oblique steel wire rope connects the lower end of the vertical part and the eye plate fixed on the angle steel column to prevent the internal area of the thin deck from deforming during welding; the pressing iron is placed on both sides of the splicing edge of the two thin decks close to each other to prevent the splicing edge from deforming during welding. The application positions and fixes the thin deck through multiple ways to ensure the welding stability, solves the thin plate deformation caused by the traditional assembly positioning horse plate welding and removal, reduces the workload of subsequent pyrotechnic work, reduces the rework, and improves the construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of thin deck splicing technology for large roll-on / roll-off ships, and in particular to a thin deck splicing device and splicing method for ships. Background Technology

[0002] In existing technologies, there is a lack of dedicated splicing jigs and splicing methods for thin-plate decks. Construction workers lack a reference for construction, resulting in severe deformation after splicing and failure to meet accuracy requirements, leading to uncontrollable workload in subsequent heat treatment operations. The existing splicing process specifically includes the following steps: 1. Welding eye plates to the free edges of the thin-plate deck (not for splicing) for turning and hoisting. 2. To prevent deformation during welding, the thin-plate deck assembly uses welded support plates, spaced approximately 500mm apart, resulting in a large welding workload. 3. The butt welding of the thin-plate deck uses mature submerged arc welding technology. After welding on one side, the support plates are removed, and the spliced ​​plates are turned over using eye plates. After carbon planing on the reverse side, the surface is covered, resulting in a large heat input. Turning and welding cause significant deformation. 4. The jig for the entire plate uses welded eye plates, which are removed after mounting. Deformation occurs at the free edges due to welding and removal.

[0003] As mentioned above, existing technologies lack specialized splicing devices and methods for thin-plate decks. The entire process of splicing thin plates involves heat input, welding and dismantling of the support plates, welding and dismantling of the lifting eye plates, and the need to turn the plates over after splicing. Furthermore, there is a lack of methods to control deformation throughout the construction process, and subsequent fire-work operations require significant time for corrections, sometimes even resulting in the complete scrapping of the thin plates. This leads to a large amount of on-site construction work, numerous rework sessions, and high material and labor costs.

[0004] Designing specialized jigs and methods for splicing thin plates to reduce deformation during hoisting, turning, welding, dismantling, welding, and grinding, ensuring high-quality welding with single-sided welding and double-sided forming in deep-penetration arc welding, overcoming limitations of site capacity and lifting height, and achieving thin plate splicing without turning, splicing and framing on the jig, thereby reducing construction costs are urgent problems that need to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a shipboard thin deck splicing device and splicing method to solve the problems of complex splicing process and large deformation in the prior art.

[0006] To achieve the above and other related objectives, the present invention provides a marine thin-deck splicing device, the splicing device comprising:

[0007] The frame includes an array of angle steel columns and multiple frame templates located at the top of the angle steel columns, wherein the frame templates connect the angle steel columns in the same column or row.

[0008] A steel platform is arranged longitudinally on both sides of the jig. The steel platform is provided with multiple rows of waist holes arranged transversely. When two thin plates are arranged longitudinally on the jig and spliced, the outer edges of the two thin plates that are relatively far apart overlap with a certain row of waist holes.

[0009] The C-shaped clamp is inserted into the waist hole to lock the outer edge of the steel platform and the thin plate, forming a rigid fixation.

[0010] Preferably, the splicing device further includes a clamping plate, which is placed on the free side of the thin plate perpendicular to the outer side to clamp the angle steel column and the outer side, forming a rigid connection.

[0011] Preferably, the brake plate is C-shaped, and an iron wedge is inserted in its working gap to assist in clamping.

[0012] Preferably, the angle steel column is connected to the ground by pre-embedded iron.

[0013] Preferably, the embedded iron is fixedly connected to the ground by threaded steel bars and chemical reagents, and the length of the threaded steel bars is at least 250mm.

[0014] Preferably, the splicing device further includes a fixing fixture, which includes a vertically connected flat plate and a vertical section. The vertical section penetrates the internal area of ​​the thin plate, and a diagonally pulled steel wire rope connects the lower end of the vertical section to the eye plate fixed on the angle steel column to prevent deformation during welding of the internal area of ​​the thin plate.

[0015] Preferably, the splicing device further includes a pressure iron, which is placed on both sides of the relatively close splicing edges of the two thin plates to prevent deformation of the splicing edges during welding.

[0016] Preferably, the steel platform is also provided with multiple horizontally arranged and parallel marking lines to assist in the positioning of the thin plate on the jig.

[0017] Preferably, the splicing device further includes a deep-penetration arc welding machine for welding the relatively close splicing edges of the two thin plates.

[0018] The present invention also provides a method for assembling panels using a panel assembly device, comprising the following steps:

[0019] S1. Determine the main dimensions of the jig based on the overall dimensions of the thin deck plate. The main dimensions of the jig are larger than the overall dimensions of the thin deck plate. Determine the jig template arrangement and the edge position of the jig based on the weld position of the splicing edge when splicing the thin deck.

[0020] S2. The angle steel column is spot-welded to the embedded iron, and the accuracy is checked again. The vertical support spacing accuracy of the angle steel column is required to be ±2mm, and the verticality accuracy of the angle steel column is required to be ±1mm / m. After the requirements are met, the angle steel column is welded to the embedded iron.

[0021] S3. Mark the lines and determine the installation height of the formwork frame. Weld the formwork frame intermittently to the upper end of the angle steel column. Check the accuracy. The flatness accuracy of the formwork frame is required to be ±1mm / m. The verticality accuracy of the formwork frame is required to be ±1mm / m. The deviation accuracy of the working surface of the formwork frame from the theoretical line is required to be -2mm to 0mm.

[0022] S4. Install the steel platform and recheck its accuracy. The flatness accuracy of the steel platform and the working surface of the template should be ±1mm / m.

[0023] S5. Based on the common characteristics of the panels, determine the position of the thin-plate panels of different models, mark the marking lines on the steel platform, and hoist the thin-plate panels to the corresponding positions according to the marking lines.

[0024] S6. After leveling the thin deck panels using magnetic tooling, perform tack welding. The tack welding length is 25mm, with 5 tack weldings at equal intervals per meter. Grind the welds flat.

[0025] S7. Arrange pressure irons on both sides of the relatively close splicing edge of the two thin decks, 100mm away from the weld of the thin deck, to prevent welding deformation; use C-clamps to fasten the relatively far outer edges of the two thin decks to the steel platform, and use a clamp to fasten the free edge perpendicular to the outer edge to the angle steel column to form a rigid connection to prevent edge deformation during welding; the fixing fixture passes through the internal area of ​​the thin deck, and the inclined steel wire rope connects the lower end of the vertical part to the eye plate fixed on the angle steel column to prevent deformation of the internal area of ​​the thin deck during welding;

[0026] S8. Thin plate welding uses a deep-melting arc welding machine with a current of 430-450A, a voltage of 38.5-39.5V, a welding speed of 500mm / min, and a dry extension of 15-17mm. A ceramic backing is applied to the reverse side, and single-sided welding is used for double-sided forming.

[0027] As described above, the present invention provides a marine thin-deck splicing device and splicing method. The splicing device includes components such as a jig, a steel platform, a pressure iron, C-clamps, a clamping plate, fixing fixtures, and steel wire ropes. When two thin decks are spliced ​​together by arranging them longitudinally on the jig, the C-clamps are used to clamp the outer edges of the steel platform and the thin decks to form a rigid fixation; the clamping plate is used to clamp the angle steel column and the free edge to form a rigid connection; the vertical part of the fixing fixture penetrates the internal area of ​​the thin deck, and the diagonally pulled steel wire rope connects the lower end of the vertical part to the eye plate fixed on the angle steel column to prevent deformation of the internal area of ​​the thin deck during welding; the pressure iron is placed on both sides of the relatively close splicing edges of the two thin decks to prevent deformation of the splicing edges during welding.

[0028] This invention positions and fixes thin-plate panels using multiple methods, ensuring weld stability and filling a gap in existing technology. It employs a common panel division method, a no-mast assembly technique, and a deep-melt arc single-sided welding double-sided forming technique, overcoming limitations of site capacity and lifting height. This allows for thin-plate panel assembly without turning over, and panel and frame construction on the jig, effectively reducing deformation caused by turning over, horizontal lifting, and welding / removal of the lifting plates. It enables both the inner and outer areas of the component work area to construct sections, effectively increasing the production capacity of each section. It solves the problem of the incompatibility of jigs for single-sided welding double-sided forming, addresses the deformation caused by welding shrinkage during thin-plate panel welding, and eliminates the deformation caused by welding and removal of traditional assembly positioning plates. This reduces subsequent fire-work workload, minimizes rework, improves construction efficiency, and lowers labor costs. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value. Attached Figure Description

[0029] Figure 1 The diagram shows a three-dimensional structure of the placement of the frame and thin plate in this invention.

[0030] Figure 2 The diagram shown is a top view of the pre-embedded iron and angle steel columns in this invention.

[0031] Figure 3 The diagram shown is a top view of the template and steel platform of the present invention.

[0032] Figure 4 The diagram shown is a schematic representation of the structure of the marking line in this invention.

[0033] Figure 5 This is a schematic diagram illustrating the use of the C-clamp in this invention.

[0034] Figure 6 The diagram shown illustrates the use of the horse board in this invention.

[0035] Figure 7The diagram shown illustrates the use of the wire rope in this invention.

[0036] Figure 8 The diagram shows the use of the pressure iron in this invention.

[0037] Figures 9-11 This diagram shows a comparison of the positions of different thin plates placed next to the frame in this invention.

[0038] Component designation explanation

[0039] 1. Tire frame

[0040] 2. Embedded iron

[0041] 3 Angle steel columns

[0042] 4. Frame template

[0043] 5 steel platforms

[0044] 6 thin deck

[0045] 7. Press iron

[0046] 8 C-clamps

[0047] 9 Horse Board

[0048] 10 Iron Wedges

[0049] 11 Fixed fixtures

[0050] 12 Steel Wire Rope

[0051] 13 Eyeplate

[0052] 14. Deep Arc Welding Machine Detailed Implementation

[0053] The following specific examples illustrate the implementation 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 embodiments, and 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.

[0054] In the detailed description of embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0055] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0056] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or 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.

[0057] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0058] like Figures 1-3 As shown, the present invention provides a shipboard thin-deck splicing device, the splicing device specifically comprising:

[0059] The frame 1 includes an array of angle steel columns 3 and multiple frame templates 4 located on the upper end of the angle steel columns 3. The frame templates 4 connect the angle steel columns 3 in the same column or row. Specifically, the frame templates 4 are arranged horizontally or vertically to form a cross-shaped grid to prevent displacement and deformation between the angle steel columns 3.

[0060] Steel platform 5, which is arranged longitudinally on both sides of the jig 1, has multiple rows of transversely arranged waist holes. (See reference...) Figures 9-11 When two thin plates 6 are arranged longitudinally on the frame 1 and spliced ​​together, the outer edges of the two thin plates 6 that are relatively far apart overlap with a certain row of waist holes.

[0061] C-clamp 8, such as Figure 5 As shown, the C-clamp 8 is inserted into the waist hole to clamp the outer edge of the steel platform 5 and the thin plate 6, forming a rigid fixation; the steel platform 5 is used to support the thin plate 6 and works with the C-clamp 8 to fix the outer edge, preventing the outer edge of the thin plate 6 from deforming during welding.

[0062] Furthermore, such as Figure 6As shown, the splicing device also includes a clamping plate 9, which is placed on the free edge of the thin plate 6 perpendicular to the outer side to clamp the angle steel column 3 and the free edge, forming a rigid connection. The clamping plate 9 is also C-shaped, and iron wedges 10 are inserted in its working gap to assist in clamping and prevent the free edge of the thin plate 6 from deforming during welding.

[0063] Furthermore, the angle steel column 3 is connected to the ground via embedded iron 2, which is fixedly connected to the ground via threaded steel and chemical reagents; the threaded steel is required to be at least 250mm long to ensure sufficient grip. The connection between the angle steel column 3 and the embedded iron 2 prevents the jig 1 from warping and deforming due to shrinkage caused by the segmented welding of the thin plate.

[0064] Furthermore, such as Figure 7 As shown, the splicing device also includes a fixing fixture 11, which includes a vertically connected flat plate and a vertical section. The vertical section penetrates the internal area of ​​the thin plate 6. A diagonally pulled steel wire rope 12 connects the lower end of the vertical section to the eye plate 13 fixed on the angle steel column 3 to prevent deformation during welding of the internal area of ​​the thin plate 6.

[0065] Furthermore, such as Figure 8 As shown, the splicing device also includes a pressure iron 7, which is placed on both sides of the relatively close splicing edges of the two thin plate panels 6. This prevents deformation of the splicing edges during welding.

[0066] Furthermore, such as Figure 4 As shown, the steel platform 5 is also provided with multiple horizontally arranged and parallel marking lines to assist in the positioning of the thin plate 6 on the jig 1.

[0067] Furthermore, such as Figure 8 As shown, the splicing device also includes a deep-melt arc welding machine 14 for welding the splicing edges.

[0068] Specifically, D-Arc deep penetration arc welding is mainly used for thick plate welding. The arc penetrates deep into the base material, and the deep part of the base material is heated to achieve a large penetration depth. In order to meet the requirements of single-sided welding and double-sided forming of thin plates, D-Arc deep penetration arc welding technology was first applied to thin plate splicing. Through multiple pre-experiments and on-site process verification, research and experiments were carried out on aspects such as the application of backing, tolerance of natural bevel, guide rail length and butt joint method, stability of welding torch clamping mechanism, and adaptability of wire feeding mechanism. Finally, the visual pass rate was ≥95%, the physical and chemical inspection was all qualified, and the welding process qualification was passed.

[0069] The present invention also provides a method for splicing thin deck panels for ships, comprising the following steps:

[0070] S1. Determine the main dimensions of the jig 1 based on the overall dimensions of the thin plate 6. The main dimensions of the jig 1 are greater than the overall dimensions of the thin plate 6. Determine the arrangement of the jig template 4 and the edge position of the jig 1 based on the weld position of the splicing edge when splicing the thin plate 6.

[0071] S2. The angle steel column 3 is spot welded to the embedded iron 2. The accuracy is checked. The vertical support spacing accuracy of the angle steel column 3 is required to be ±2mm, and the verticality accuracy of the angle steel column 3 is required to be ±1mm / m. After the requirements are met, the angle steel column 3 is welded to the embedded iron 2.

[0072] S3. Mark the lines and determine the installation height of the formwork template 4. The formwork template 4 is intermittently welded to the upper end of the angle steel column 3. Check the accuracy. The flatness accuracy requirement of the formwork template 4 is ±1mm / m, the verticality accuracy requirement of the formwork template 4 is ±1mm / m, and the deviation accuracy requirement between the working surface of the formwork template 4 and the theoretical line is -2mm to 0mm.

[0073] S4. Install steel platform 5 and recheck its accuracy. The flatness accuracy requirement of the working surface of steel platform 5 and template 4 is ±1mm / m.

[0074] S5. Based on the commonalities of the panels, determine the positions of the thin-plate 6 of different models, mark the lines on the steel platform 5, and hoist the thin-plate 6 to the corresponding positions according to the marking lines.

[0075] S6. After leveling the 6-panel thin deck using magnetic tooling, perform tack welding. The tack welding length is 25mm, with 5 tack weldings at equal intervals per meter, and grind them flat.

[0076] S7. Pressure irons 7 are arranged on both sides of the relatively close splicing edge of the two thin-plate panels 6, 100mm away from the weld seam of the thin-plate panel 6, to prevent welding deformation; C-clamps 8 are used to fasten the outer edge of the thin-plate panel 6 to the steel platform 5, and the support plate 9 is used to fasten the free edge perpendicular to the outer edge to the angle steel column 3, forming a rigid connection to prevent edge deformation during welding; the fixing fixture 11 passes through the internal area of ​​the thin-plate panel 6, and the diagonally pulled steel wire rope 12 connects the lower end of the vertical part to the eye plate 13 fixed on the angle steel column 3 to prevent deformation of the internal area of ​​the thin-plate panel 6 during welding. Figures 5-8 As shown.

[0077] S8 and thin plate 6 are welded using a deep-melting arc welding machine 14 with a current of 430-450A, a voltage of 38.5-39.5V, a welding speed of 500mm / min, and a dry extension of 15-17mm. A ceramic backing is applied to the reverse side, and single-sided welding is used for double-sided forming.

[0078] Specifically, in step S1, a common division of the panels was designed according to the specific ship type, which solved the problem that the jigs for single-sided welding and double-sided forming could not be shared.

[0079] Specifically, in steps S2 to S5, the thin plate special jig adopts full-process precision control, which reduces the deformation of thin plate splicing caused by the deterioration of jig precision.

[0080] Specifically, in steps S6 to S7, the thin plate splicing adopts the non-mast assembly technology, which solves the problem of thin plate deformation caused by welding shrinkage during the welding process of thin plate splicing, and solves the problem of thin plate deformation caused by welding and removal of traditional assembly positioning masts.

[0081] Specifically, in step S8, the thin-plate panel welding adopts deep-penetration arc single-sided welding double-sided forming technology. This one-time forming technology for thin-plate panel welding overcomes the limitations of site capacity and lifting height, enabling thin-plate panels to be assembled without turning over, and the panels and frame to be constructed on the formwork. This effectively reduces deformation caused by turning over, horizontal lifting, and welding and disassembly of the lifting plates. It enables both the inner and outer areas of the component operation area to construct sections, effectively increasing the production capacity of the manufacturing sections.

[0082] It should be noted that, Figures 9-11 The thin plate is placed next to the jig only to facilitate the demonstration of the relative position of the thin plate and the jig. In actual operation, the thin plate needs to be placed on the jig.

[0083] In summary, this invention provides a marine thin-deck splicing device and method. The splicing device includes components such as a jig, a steel platform, a pressure iron, C-clamps, a clamping plate, fixing fixtures, and steel wire ropes. When two thin-deck plates are spliced ​​longitudinally on the jig, the C-clamps are used to clamp the outer edges of the steel platform and the thin-deck plates to form a rigid fixation; the clamping plate is used to clamp the angle steel column and the free edge to form a rigid connection; the vertical part of the fixing fixture penetrates the internal area of ​​the thin-deck plate, and the diagonally pulled steel wire rope connects the lower end of the vertical part to the eye plate fixed on the angle steel column to prevent deformation of the internal area of ​​the thin-deck plate during welding; the pressure iron is placed on both sides of the relatively close splicing edges of the two thin-deck plates to prevent deformation of the splicing edges during welding.

[0084] This invention positions and fixes thin-plate panels using multiple methods, ensuring weld stability and filling a gap in existing technology. It employs a common panel division method, a no-mast assembly technique, and a deep-melt arc single-sided welding double-sided forming technique, overcoming limitations of site capacity and lifting height. This allows for thin-plate panel assembly without turning over, and panel and frame construction on the jig, effectively reducing deformation caused by turning over, horizontal lifting, and welding / removal of the lifting plates. It enables both the inner and outer areas of the component work area to construct sections, effectively increasing the production capacity of each section. It solves the problem of the incompatibility of jigs for single-sided welding double-sided forming, addresses the deformation caused by welding shrinkage during thin-plate panel welding, and eliminates the deformation caused by welding and removal of traditional assembly positioning plates. This reduces subsequent fire-work workload, minimizes rework, improves construction efficiency, and lowers labor costs. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0085] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A marine thin-deck splicing device, characterized in that, The panel assembly includes: The frame includes an array of angle steel columns and multiple frame templates located at the top of the angle steel columns, wherein the frame templates connect the angle steel columns in the same column or row. A steel platform is arranged longitudinally on both sides of the jig. The steel platform is provided with multiple rows of waist holes arranged transversely. When two thin plates are arranged longitudinally on the jig and spliced, the outer edges of the two thin plates that are relatively far apart overlap with a certain row of waist holes. C-shaped clips are inserted into the waist holes to clamp the outer edges of the steel platform and the thin plate, forming a rigid fixation; The fixture includes a vertically connected flat plate and a vertical section. The vertical section penetrates the interior area of ​​the thin plate. A diagonally pulled steel wire rope connects the lower end of the vertical section to the eye plate fixed on the angle steel column to prevent deformation during welding of the interior area of ​​the thin plate.

2. The panel assembly device according to claim 1, characterized in that, The panel assembly also includes a support plate, which is placed on the free side of the thin plate perpendicular to the outer side to clamp the angle steel column and the outer side, forming a rigid connection.

3. The panel assembly device according to claim 2, characterized in that, The brake plate is C-shaped, and iron wedges are inserted in its working gap to assist in clamping.

4. The panel assembly device according to claim 1, characterized in that, The angle steel column is connected to the ground by pre-embedded iron.

5. The panel assembly device according to claim 4, characterized in that, The embedded iron is fixedly connected to the ground by threaded steel bars and chemical reagents, and the length of the threaded steel bars is at least 250mm.

6. The panel assembly device according to claim 1, characterized in that, The splicing device also includes a pressure iron, which is placed on both sides of the relatively close splicing edges of the two thin plates to prevent deformation of the splicing edges during welding.

7. The panel assembly device according to claim 1, characterized in that, The steel platform is also equipped with multiple horizontally arranged and parallel marking lines to assist in the positioning of the thin plate on the jig.

8. The panel assembly device according to claim 7, characterized in that, The splicing device also includes a deep-melt arc welding machine for welding the relatively close splicing edges of two thin plates.

9. A method for assembling panels using the assembly device according to any one of claims 7-8, characterized in that, Includes the following steps: S1. Determine the main dimensions of the jig based on the overall dimensions of the thin deck plate. The main dimensions of the jig are larger than the overall dimensions of the thin deck plate. Determine the jig template arrangement and the edge position of the jig based on the weld position of the splicing edge when splicing the thin deck. S2. The angle steel column is spot-welded to the embedded iron, and the accuracy is checked again. The vertical support spacing accuracy of the angle steel column is required to be ±2mm, and the verticality accuracy of the angle steel column is required to be ±1mm / m. After the requirements are met, the angle steel column is welded to the embedded iron. S3. Mark the lines and determine the installation height of the formwork frame. Weld the formwork frame intermittently to the upper end of the angle steel column. Check the accuracy. The flatness accuracy of the formwork frame is required to be ±1mm / m. The verticality accuracy of the formwork frame is required to be ±1mm / m. The deviation accuracy of the working surface of the formwork frame from the theoretical line is required to be -2mm~0mm. S4. Install the steel platform and recheck its accuracy. The flatness accuracy of the steel platform and the working surface of the template should be ±1mm / m. S5. Based on the common characteristics of the panels, determine the position of the thin-plate panels of different models, mark the marking lines on the steel platform, and hoist the thin-plate panels to the corresponding positions according to the marking lines. S6. After leveling the thin deck panels using magnetic tooling, perform tack welding. The tack welding length is 25mm, with 5 tack weldings at equal intervals per meter. Grind the welds flat. S7. Arrange pressure irons on both sides of the relatively close splicing edge of the two thin decks, 100mm away from the weld of the thin deck, to prevent welding deformation; use C-clamps to fasten the relatively far outer edges of the two thin decks to the steel platform, and use a clamp to fasten the free edge perpendicular to the outer edge to the angle steel column to form a rigid connection to prevent edge deformation during welding; the fixing fixture passes through the internal area of ​​the thin deck, and the inclined steel wire rope connects the lower end of the vertical part to the eye plate fixed on the angle steel column to prevent deformation of the internal area of ​​the thin deck during welding; S8. Thin plate welding uses a deep-melting arc welding machine with a current of 430~450A, a voltage of 38.5~39.5V, a welding speed of 500mm / min, and a dry extension of 15~17mm. Ceramic backing is applied on the reverse side, and single-sided welding is used for double-sided forming.

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