Fire work tool and fire work method for nested thickening plate of large roll-on-roll-off ship

Abstract

The invention provides a hot work tool and a hot work method for a nested thickening plate of a large roll-on-roll-off ship, the hot work tool comprises a platform plate and a plurality of clamping groove stand columns fixed on the outer edge of the platform plate, clamping grooves are formed in the upper portions of the clamping groove stand columns, and the clamping grooves are used for containing the ends of all square steel pipes of a pressing assembly. During use, a thickening plate to be subjected to hot work correction is placed on the platform plate, the base plate is laid on the upper surface of the thickening plate, and the jack is vertically arranged between the base plate and each square steel pipe, so that downward pressure is provided for the thickening plate, and correction of deformation of the thickening plate is realized; and then hot work heating is carried out according to certain procedures to release internal stress and correct deformation, so that the flatness of the thickened plate is guaranteed. According to the hot work method, the construction precision of the nested thickening plate can be effectively controlled, the thickening plate is effectively corrected to be within the precision allowable range, high-precision construction of the nested thickening plate is guaranteed, the hot work amount and rework are reduced, the construction difficulty is lowered, and the labor cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a pyrotechnic tool and a pyrotechnic method for a nested thickened plate of a large roll-on / roll-off ship. Background Art

[0002] In the prior art, there is a lack of pyrotechnic methods for nested thickened plates of large roll-on / roll-off ships. When two nested thickened plates are welded, the residual stress generated will cause the thickened plates, especially the area near the weld, to deform, so pyrotechnics are needed to correct them. In the prior art, hydraulic presses are generally used for local correction or pyrotechnics on porous steel platforms. The pyrotechnics on the steel platform include the following steps: 1. Place the nested thickened plates on the porous steel platform; 2. Fix the free edges with iron horses and perform pyrotechnics on the thickened plates.

[0003] As mentioned above, the prior art lacks a pyrotechnic method for nested thickened plates, the iron horse cannot constrain the thickened plates to be flat, the small contact area between the iron horse and the thickened plates leads to local mutations, the thickened plates cannot be pyrotechnic to meet the precision requirements, the hydraulic press correction efficiency is low and the equipment occupancy time is long, the on-site construction volume is large, there is a lot of on-site rework, and the labor cost is high.

[0004] How to design a pyrotechnic method for nested thickened plates of large roll-on / roll-off ships to ensure accuracy and installation quality and reduce labor costs is an urgent problem that technicians in this field need to solve. Summary of the invention

[0005] In view of the shortcomings of the prior art described above, the present invention provides a pyrotechnic tooling for nested thickened plates of large roll-on / roll-off ships, the pyrotechnic tooling comprising a platform plate, a slot column is fixed at the middle of each outer edge of the platform plate, the slot column comprises a first side plate and a second side plate which are vertically arranged and parallel to each other, a column bottom plate and a column support plate which are horizontally arranged are sandwiched between the first side plate and the second side plate, the column support plate is arranged parallel to the top of the column bottom plate, the outer edges of the first side plate and the second side plate which are away from the center of the frame plate are connected with a column reinforcement plate, the column reinforcement plate is vertically connected to the column support plate to form a slot;

[0006] The pyrotechnic tooling also includes a clamping assembly, which includes a square steel pipe, and the square steel pipe includes a first square steel pipe, a second square steel pipe and a third square steel pipe located in the same plane, and the second square steel pipe and the third square steel pipe are symmetrically arranged on both sides of the first square steel pipe and are vertically connected to the middle of the first square steel pipe; the outer end of the square steel pipe is used to be inserted into the slot of the slot column, and the column limit strip located above the column support plate penetrates the first side plate and the second side plate, so as to limit the upper part of the square steel pipe;

[0007] The platform plate is used to place the thickened plate to be pyrotechnically corrected. The upper surface of the thickened plate is paved with a pad, which is located under each square steel pipe. The jack is vertically arranged between the pad and each square steel pipe, thereby providing downward pressure to the thickened plate to correct the deformation of the thickened plate.

[0008] Optionally, the platform plate is square and hollow in the center.

[0009] Optionally, the clamping assembly also includes a steel pipe reinforcement plate; the steel pipe reinforcement plate spans over the first square steel pipe and connects the second square steel pipe and the third square steel pipe, and the steel pipe reinforcement plate is provided with a lifting hole.

[0010] Optionally, the thickened plate includes a first thickened plate and a second thickened plate that are nested and welded, the first thickened plate is sleeved on the periphery of the second thickened plate, the first thickened plate and the second thickened plate are flush on one side, and a weld is formed at the connection between the first thickened plate and the second thickened plate.

[0011] Optionally, it also includes a welding torch, a crowbar and a rubber hammer. The welding torch is used to heat the thickened plate to release its internal stress, thereby achieving pyrotechnic correction to ensure the flatness of the entire thickened plate; the rubber hammer is used to hammer near the heating area to promote stress release; the crowbar is used to assist in adjusting the position of the thickened plate on the platform plate.

[0012] The present invention also provides a pyrotechnic method of the pyrotechnic tool, comprising the following steps:

[0013] S1. Lifting the thickened plate, using a crane to lift the thickened plate onto the platform plate; the thickened plate comprises a first thickened plate and a second thickened plate which are nested and welded, and the first thickened plate is sleeved on the outer periphery of the second thickened plate;

[0014] S2. Press the thickened plate, lift the pressing assembly, and lift the pressing assembly above the slot column to ensure that the four ends of the pressing assembly correspond to the four slot columns respectively; place the pressing assembly in the slot of the slot column, and insert the column limit strip;

[0015] S3. Back-burn the two sides of the weld of the first thickened plate and the second thickened plate to release stress and form multiple heating trajectory lines. During the process, the first thickened plate is pyrotechnic first. The first thickened plate includes four frames, the first frame is symmetrical with the second frame, the third frame is symmetrical with the fourth frame, and each frame forms two heating trajectory lines along the length direction of the frame from the center point to both sides. The first, second, third and fourth frames are pyrotechnic in sequence to form a total of 8 heating trajectory lines. Then the second thickened plate is pyrotechnic, and the 8 heating trajectory lines of the second thickened plate are symmetrically distributed with the 8 heating trajectory lines of the first thickened plate about the weld. During the process, a rubber hammer is used to hammer the periphery of the pyrotechnic to release residual stress.

[0016] Optionally, in step S3, the heating trajectory is parallel to the weld, and the center of the heating trajectory is 8-15 mm away from the edge of the weld.

[0017] Optionally, the method further includes the following steps:

[0018] S4. Release the stress of the four corners of the first thickened plate by water and fire. The pyrotechnics are carried out in sequence to form 4 heating trajectories. The heating direction is from inside to outside. The first, second, third and fourth heating trajectories are carried out in sequence. The second and fourth heating trajectories are located at the diagonals of the first and third heating trajectories respectively. During the process, a rubber hammer is used to hammer around the pyrotechnics.

[0019] Optionally, the method further includes the following steps:

[0020] S5. Use water and fire to release stress on the four frames of the first thickened plate. The heating direction is from inside to outside. The heating trajectory is perpendicular to the length direction of the frame. Each frame forms two symmetrical heating trajectory lines. The first, second, third and fourth frames are subjected to pyrotechnics in sequence. The horizontal distance between the heating trajectory line and the highest point of the raised part of the first thickened plate is 50 to 70 mm. During the process, a rubber hammer is used to hammer around the pyrotechnics.

[0021] Optionally, the method further includes the following steps:

[0022] S6. Review the accuracy data. After removing the jack, measure the flatness of the first thickened plate. The flatness is required to be 0 to 3 mm. If the local area does not meet the accuracy requirements, perform local water and fire pyrotechnics. The horizontal distance between the heating trajectory line and the highest point of the raised part of the first thickened plate is 50 to 70 mm. Use a rubber hammer to hammer around the pyrotechnics during the process.

[0023] As described above, the present invention provides a pyrotechnic tool and pyrotechnic method for nested thickened plates of large roll-on / roll-off ships, the pyrotechnic tool comprising a platform plate and a plurality of slot columns fixed to the outer edge of the platform plate, the slot columns are formed with slots on the upper part, the slots are used to accommodate the ends of each square steel pipe of the clamping assembly. When in use, the thickened plate to be pyrotechnically corrected is placed on the platform plate, the upper surface of the thickened plate is paved with a pad, and the jack is vertically arranged between the pad and each square steel pipe, thereby providing downward pressure to the thickened plate to correct the deformation of the thickened plate; then, pyrotechnic heating is performed according to a certain process to release the internal stress and correct the deformation, thereby ensuring the flatness of the thickened plate.

[0024] This pyrotechnic method can effectively control the construction accuracy of the nested thickened plates and effectively correct the thickened plates to within the allowable accuracy range. The pyrotechnic full-process constraint method and new pyrotechnic methods adopted ensure the high-precision construction of the nested thickened plates, reduce the amount of pyrotechnics and rework, reduce the construction difficulty, and reduce labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It shows the overall structural schematic diagram of the pyrotechnic tool in the first embodiment of the present invention.

[0026] Figure 2 It shows a schematic diagram of the structure of the platform plate and the slot columns in the first embodiment of the present invention.

[0027] Figure 3 It is a schematic diagram showing the structure of a thickened plate placed on a platform plate in the first embodiment of the present invention.

[0028] Figure 4 Shown is a schematic diagram of the three-dimensional structure of the clamping assembly in the first embodiment of the present invention.

[0029] Figure 5 Shown is a side structural schematic diagram of the clamping assembly in Embodiment 1 of the present invention.

[0030] Figure 6 It shows a schematic diagram of the operation of the pad and the jack in the first embodiment of the present invention.

[0031] Figure 7 It is a schematic diagram of the process of weld back-burning in the second embodiment of the present invention.

[0032] Figure 8 It shows a schematic diagram of the four-corner water and fire process in the second embodiment of the present invention.

[0033] Fig. 9 It shows a schematic diagram of the process of water and fire treatment of the frame in the second embodiment of the present invention.

[0034] Fig.10 It is a schematic diagram of the process of water and fire treatment of the raised part in the second embodiment of the present invention.

[0035] Fig.11 It is a schematic diagram of the structure after the jack is removed in the second embodiment of the present invention.

[0036] Component number description

[0037] Platform plate 1, slot column 2, first side plate 211, second side plate 212, column base plate 22, column support plate 23, column reinforcement plate 24, clamping assembly 3, first square steel pipe 311, second square steel pipe 312, third steel pipe 313, steel pipe reinforcement plate 32, column limit strip 25, pad 4, jack 5, pad 41, pad 42, thickened plate 6, first thickened plate 61, second thickened plate 62, weld 600, raised part 610. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0039] For example, when describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic view is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0040] For ease of description, spatial relational terms such as "under", "below", "below", "below", "above", "on", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relational terms are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can be one or more intervening layers. As used herein, "between..." means including the end point values.

[0041] In the context of the present application, a structure in which a first feature is described as being "above" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0042] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and therefore the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0043] Embodiment 1

[0044] like Figures 1 to 6 As shown, this embodiment provides a pyrotechnic tool for nested thickened plates of a large ro-ro ship, and the pyrotechnic tool specifically includes:

[0045] The platform plate 1 adopts a square structure and is a frame plate with a hollow center, so as to reduce the weight while ensuring the strength of the platform plate. A slot column 2 is fixed in the middle of each outer edge of the platform plate 1. The slot column 2 includes a first side plate 211 and a second side plate 212 that are vertically arranged and parallel to each other. A horizontally arranged column bottom plate 22 and a column support plate 23 are sandwiched between the first side plate 211 and the second side plate 212. The column support plate 23 is arranged parallel to the top of the column bottom plate 22. The outer edges of the first side plate 211 and the second side plate 212 away from the center of the frame plate are connected with a column reinforcement plate 24, and the column reinforcement plate 24 is vertically connected to the column support plate 23.

[0046] Furthermore, it also includes a clamping assembly 3, which includes a square steel pipe and a steel pipe reinforcement plate 32. The square steel pipe includes a first square steel pipe 311, a second square steel pipe 312 and a third steel pipe 313 located in the same plane. The second square steel pipe 312 and the third steel pipe 313 are symmetrically arranged on both sides of the first square steel pipe 311 and are vertically connected to the middle of the first square steel pipe 311. The steel pipe reinforcement plate 32 spans the top of the first square steel pipe 311 and connects the second square steel pipe 312 and the third steel pipe 313. The steel pipe reinforcement plate 32 is provided with a lifting hole for lifting the entire clamping assembly 3. The four ends of the clamping assembly 3 are equidistant and can be rotated around the central intersection for equivalent use.

[0047] The outer end of the square steel pipe is used to be inserted into the slot formed by the column support plate 23 and the column reinforcement plate 24 of the slot column 2. The column limit strip 25 located above the column support plate 23 passes through the first side plate 211 and the second side plate 212, thereby limiting the upper part of the square steel pipe to prevent the square steel pipe from moving upward.

[0048] The platform plate 1 is used to place the thickened plate 6 to be pyrotechnically corrected, and the thickened plate includes a first thickened plate 61 and a second thickened plate 62 that are nested and welded. The first thickened plate 61 is sleeved on the outer periphery of the second thickened plate 62. The first thickened plate 61 and the second thickened plate 62 are flush on one side, and a weld 600 is formed at the connection between the first thickened plate 61 and the second thickened plate 62.

[0049] A pad 4 is laid on the upper surface of each frame of the first thickened plate 61, and the pad 4 is correspondingly located under each square steel pipe (including the first square steel pipe 311, the second square steel pipe 312 and the third square steel pipe 313). The jack is vertically arranged between the pad 4 and each square steel pipe, thereby providing downward pressure to the first thickened plate to correct the deformation of the first thickened plate.

[0050] The upper surface of the second thickened plate 62 is also paved with a pad 4, and the jack 5 is vertically arranged between the pad 4 and the first square steel pipe 311, thereby providing downward pressure to the second thickened plate 62 to correct the deformation of the second thickened plate 62. Here, the pad can increase the contact area, disperse the downward pressure, and effectively reduce local deformation mutations.

[0051] Furthermore, it also includes a welding torch, a pry bar and a rubber hammer. The welding torch is used to heat the thickened plate to release its internal stress, thereby achieving pyrotechnic correction to ensure the flatness of the entire thickened plate; the rubber hammer is used to hammer near the heated area to promote stress release. The pry bar is used to assist in adjusting the position of the thickened plate 6 on the platform plate 1.

[0052] Embodiment 2

[0053] Based on the pyrotechnic tool in the first embodiment, this embodiment provides a pyrotechnic method for nested thickened plates of a large roll-on / roll-off ship, comprising the following steps:

[0054] S1, such as Figures 1 to 3 As shown, the thickened plate 6 is hoisted and hoisted onto the platform plate 1 using a crane on site, wherein the first thickened plate 61 is 12 mm thick, the second thickened plate 62 is 20 mm thick, the first thickened plate 61 is flush with the second thickened plate 62 on one side, and the second thickened plate 62 protrudes from the first thickened plate 61 by 8 mm on the other side, and the second thickened plate 62 is required to be placed in the hollow area of ​​the platform plate 1. If the second thickened plate 62 is not placed in the hollow area of ​​the platform plate 1, use a pry bar to insert the bottom of the thickened plate 6 for adjustment.

[0055] S2, such as Figures 4 to 6 As shown, the clamping thickened plate is lifted by the steel pipe reinforcement plate 32 on the clamping assembly 3, and the clamping assembly 3 is lifted above the slot column 2 to ensure that the four ends of the clamping assembly 3 correspond to the four slot columns 2 respectively. The clamping assembly 3 is placed in the slot of the slot column 2, and the column limit strip 25 is inserted. The column limit strip 25 is used to limit the upward mechanical displacement of the clamping assembly 3. The pads 41 and 42 are placed on the first thickened plate 61 and the second thickened plate 62 along the center line of the clamping assembly 3 respectively, including placing the jack 5 on the pad, and the upper end of the jack supports the clamping assembly 3. By adjusting the jack 5, the thickened plate 6 is pressed down to fit the surface of the platform plate 1, and the flatness of the clamping part is required to be 0 to 3 mm.

[0056] S3, such as Figure 7 As shown, the welds of the first thickened plate 61 and the second thickened plate 62 are back-burned to release stress. The butt joints of the first thickened plate 61 and the second thickened plate 62 are welded by submerged arc welding. Affected by welding shrinkage, there are angular deformation and large internal stress at the weld caused by welding shrinkage. The area around the weld is heated to release the internal stress and correct the deformation. The specific operation is as follows:

[0057] The back burning of the weld adopts the symmetrical pyrotechnics from the middle to the sides. The center of the heating trajectory is about 10mm away from the edge of the weld. It is required that the steel plate be air-cooled to room temperature after each pyrotechnic before the next pyrotechnic. First, the first thickened plate 61 is pyrotechnic. The first thickened plate 61 includes four frames. The first frame is symmetrical with the second frame, and the third frame is symmetrical with the fourth frame. Each frame forms two heating trajectory lines along the length direction of the frame from the center point to both sides. The first, second, third, and fourth frames are pyrotechnic in sequence, forming a total of 8 heating trajectory lines, from sequence 1 to sequence 8. Then, the second thickened plate 62 is pyrotechnic. The 8 heating trajectory lines of the second thickened plate 62 are symmetrically distributed with the 8 heating trajectory lines of the first thickened plate 61 about the weld, from sequence 9 to sequence 16.

[0058] The pyrotechnic parameters of the 8 heating trajectory lines of the first thickened plate 61 are: medium heating nozzle, heating temperature 500℃~600℃, heating speed 8~15mm / s, heating width 10~15mm, and flame core 2~3mm away from the plate surface. The pyrotechnic parameters of the 8 heating trajectory lines of the first thickened plate 61 are: medium heating nozzle, heating temperature ≤850℃, heating speed 5~10mm / s, heating width 15~30mm, and flame core 2~3mm away from the plate. The pyrotechnic process uses a rubber hammer to hammer the periphery of the pyrotechnic to effectively release residual stress.

[0059] S4, such as Figure 8 As shown, the water and fire stress release of the four corners of the first thickened plate 61, the thickness of the first thickened plate 61 is less than that of the second thickened plate 62, so the first thickened plate 61 is more susceptible to deformation due to internal stress. According to the internal stress distribution rule, the internal stress of the four corners of the first thickened plate 61 is greater than the internal stress of the four frames, so the water and fire stress release of the four corners is performed first. The length of the heating trajectory of the four corners is 2 / 3 of the distance between the weld at the corner and the corner of the outer edge of the first thickened plate, and the heating direction is from the inside to the outside. The pyrotechnics are carried out in sequence to form 4 heating trajectory lines, the first, second, third, and fourth heating trajectory lines are carried out in sequence, and the second and fourth heating trajectory lines are located at the diagonal positions of the first and third heating trajectory lines, respectively, and the sequence is ranked 1 to 4. The pyrotechnic parameters are: medium heating nozzle, heating temperature 500℃~600℃, minimum water and fire distance (heating width) 20~30mm, heating speed 13~20mm / s, heating width 10~15mm, and flame core distance 2~3mm from the plate. During the process, a rubber hammer is used to hammer around the pyrotechnics to effectively release residual stress.

[0060] S5, such as Figures 9-10As shown, the four frames of the first thickened plate 61 are subjected to water and fire stress release. The length of the heating trajectory is 2 / 3 of the distance between the butt weld and the outer edge of the first thickened plate 61. The heating direction is from inside to outside. The heating trajectory is perpendicular to the length direction of the frame. Each frame forms two mutually symmetrical heating trajectory lines. The first, second, third, and fourth frames are subjected to pyrotechnics in sequence. The pyrotechnics are carried out in sequence, from sequence 1 to sequence 8. The horizontal distance between the heating trajectory and the highest point of the raised part 610 of the first thickened plate 61 is 50-70 mm. The applicable plate thickness is 8-12 mm. The heating nozzle is medium, the heating temperature is 500℃-600℃, the minimum water and fire spacing is 20-30 mm, the heating speed is 13-20 mm / s, the heating width is 10-15 mm, and the flame core is 2-3 mm away from the plate. During the pyrotechnics process, a rubber hammer is used to hammer the periphery of the pyrotechnics to effectively release the residual stress.

[0061] S6, such as Figures 10-11 As shown, check the accuracy data, remove the jack 5, measure the flatness of the first thickened plate 61, and require a flatness of 0 to 3 mm. If the local accuracy requirements are not met, perform local water and fire pyrotechnics. The horizontal distance between the heating trajectory and the highest point of the raised part 610 of the first thickened plate 61 is 50 to 70 mm, the applicable plate thickness is 8 to 12 mm, the heating nozzle is medium, the heating temperature is 500°C to 600°C, the minimum water and fire spacing is 20 to 30 mm, the heating speed is 13 to 20 mm / s, the heating width is 10 to 15 mm, and the flame core is 2 to 3 mm away from the plate. Use a rubber hammer to hammer the periphery of the pyrotechnics during the process to effectively release residual stress.

[0062] In summary, the present invention provides a pyrotechnic tool and pyrotechnic method for nested thickened plates of large roll-on / roll-off ships, the pyrotechnic tool comprising a platform plate and a plurality of slot columns fixed to the outer edge of the platform plate, the slot columns are formed with slots on the upper part, the slots are used to accommodate the ends of each square steel pipe of the clamping assembly. When in use, the thickened plate to be pyrotechnically corrected is placed on the platform plate, a pad is laid on the upper surface of the thickened plate, and a jack is vertically arranged between the pad and each square steel pipe, thereby providing downward pressure to the thickened plate to correct the deformation of the thickened plate; then, pyrotechnic heating is performed according to a certain process to release the internal stress and correct the deformation, thereby ensuring the flatness of the thickened plate.

[0063] This pyrotechnic method can effectively control the construction accuracy of the nested thickened plates and effectively correct the thickened plates to within the allowable accuracy range. The pyrotechnic full-process constraint method and new pyrotechnic methods adopted ensure the high-precision construction of the nested thickened plates, reduce the amount of pyrotechnics and rework, reduce the construction difficulty, and reduce labor costs.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A pyrotechnic tool for nested thickened plates of large ro-ro ships, characterized in that: The pyrotechnic tooling comprises a platform plate, a slot column is fixed at the middle of each outer edge of the platform plate, the slot column comprises a first side plate and a second side plate which are vertically arranged and parallel to each other, a horizontally arranged column bottom plate and a column support plate are sandwiched between the first side plate and the second side plate, the column support plate is arranged parallel to the top of the column bottom plate, the outer edges of the first side plate and the second side plate away from the center of the frame plate are connected with a column reinforcement plate, and the column reinforcement plate is vertically connected to the column support plate to form a slot; The pyrotechnic tooling also includes a clamping assembly, which includes a square steel pipe, and the square steel pipe includes a first square steel pipe, a second square steel pipe and a third square steel pipe located in the same plane, and the second square steel pipe and the third square steel pipe are symmetrically arranged on both sides of the first square steel pipe and are vertically connected to the middle of the first square steel pipe; the outer end of the square steel pipe is used to be inserted into the slot of the slot column, and the column limit strip located above the column support plate penetrates the first side plate and the second side plate, so as to limit the upper part of the square steel pipe; The platform plate is used to place the thickened plate to be pyrotechnically corrected. The upper surface of the thickened plate is paved with a pad, which is located under each square steel pipe. The jack is vertically arranged between the pad and each square steel pipe, thereby providing downward pressure to the thickened plate to correct the deformation of the thickened plate.

2. The pyrotechnic tooling for nested thickened plates of large ro-ro ships according to claim 1, characterized in that: The platform plate is square and has a hollow center.

3. The pyrotechnic tool for nested thickened plates of large ro-ro ships according to claim 1, characterized in that: The clamping assembly also includes a steel pipe reinforcement plate; the steel pipe reinforcement plate spans over the first square steel pipe and connects the second square steel pipe and the third square steel pipe, and the steel pipe reinforcement plate is provided with a lifting hole.

4. The pyrotechnic tool for nested thickened plates of large ro-ro ships according to claim 1, characterized in that: The thickened plate comprises a first thickened plate and a second thickened plate which are nested and welded. The first thickened plate is sleeved on the periphery of the second thickened plate. The first thickened plate and the second thickened plate are flush on one side. A weld is formed at the connection between the first thickened plate and the second thickened plate.

5. The pyrotechnic tool for nested thickened plates of large ro-ro ships according to claim 1, characterized in that: It also includes a welding torch, a crowbar and a rubber hammer. The welding torch is used to heat the thickened plate to release its internal stress, thereby achieving pyrotechnic correction to ensure the flatness of the entire thickened plate; the rubber hammer is used to hammer near the heating area to promote stress release; the crowbar is used to assist in adjusting the position of the thickened plate on the platform plate.

6. A pyrotechnic method using the pyrotechnic tool according to any one of claims 1 to 5, characterized in that: The steps include: S1. Lifting the thickened plate, using a crane to lift the thickened plate onto the platform plate; the thickened plate comprises a first thickened plate and a second thickened plate which are nested and welded, and the first thickened plate is sleeved on the outer periphery of the second thickened plate; S2. Press the thickened plate, lift the pressing assembly, and lift the pressing assembly above the slot column to ensure that the four ends of the pressing assembly correspond to the four slot columns respectively; place the pressing assembly in the slot of the slot column, and insert the column limit strip; S3. Back-burn the two sides of the weld of the first thickened plate and the second thickened plate to release stress and form multiple heating trajectory lines. During the process, the first thickened plate is pyrotechnic first. The first thickened plate includes four frames, the first frame is symmetrical with the second frame, the third frame is symmetrical with the fourth frame, and each frame forms two heating trajectory lines along the length direction of the frame from the center point to both sides. The first, second, third and fourth frames are pyrotechnic in sequence to form a total of 8 heating trajectory lines. Then the second thickened plate is pyrotechnic, and the 8 heating trajectory lines of the second thickened plate are symmetrically distributed with the 8 heating trajectory lines of the first thickened plate about the weld. During the process, a rubber hammer is used to hammer the periphery of the pyrotechnic to release residual stress.

7. The pyrotechnic method according to claim 6, characterized in that: In step S3, the heating trajectory is parallel to the weld, and the center of the heating trajectory is 8-15 mm away from the edge of the weld.

8. The pyrotechnic method according to claim 6, characterized in that: The following steps are also included: S4. Release the stress of the four corners of the first thickened plate by water and fire. The pyrotechnics are carried out in sequence to form 4 heating trajectories. The heating direction is from inside to outside. The first, second, third and fourth heating trajectories are carried out in sequence. The second and fourth heating trajectories are located at the diagonals of the first and third heating trajectories respectively. During the process, a rubber hammer is used to hammer around the pyrotechnics.

9. The pyrotechnic method according to claim 8, characterized in that: The following steps are also included: S5. Use water and fire to release stress on the four frames of the first thickened plate. The heating direction is from inside to outside. The heating trajectory is perpendicular to the length direction of the frame. Each frame forms two symmetrical heating trajectory lines. The first, second, third and fourth frames are subjected to pyrotechnics in sequence. The horizontal distance between the heating trajectory line and the highest point of the raised part of the first thickened plate is 50 to 70 mm. During the process, a rubber hammer is used to hammer around the pyrotechnics.

10. The pyrotechnic method according to claim 9, characterized in that: The following steps are also included: S6. Review the accuracy data. After removing the jack, measure the flatness of the first thickened plate. The flatness is required to be 0 to 3 mm. If the local area does not meet the accuracy requirements, perform local water and fire pyrotechnics. The horizontal distance between the heating trajectory line and the highest point of the raised part of the first thickened plate is 50 to 70 mm. Use a rubber hammer to hammer around the pyrotechnics during the process.

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