Outer packaging lagging method

Abstract

To provide a method that improves working accuracy of outer packaging lagging construction, and reduces a construction period by reducing work time at the same time.SOLUTION: An outer packaging lagging method comprises the steps of: preparing a divided part assembling instruction drawing to divide the whole to assembling parts and indicate the assembling sequence on the basis of a design drawing of a reaction vessel; preparing each divided part machining drawing on the basis of the divided part assembling instruction drawing; making in advance various sheet metal parts necessary to outer packaging of the whole vessel, which are divided into common standard parts and processing parts, on the basis of the divided part machining drawing; and executing outer packaging lagging construction by assembling the standard parts and the various processing parts on the basis of the assembling instruction drawing in the site.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to an exterior racking method for vessels such as large reactors, and more particularly to an exterior racking method in which various divided parts prepared in advance based on a divided sheet metal part assembly drawing are assembled on-site. [Background technology]

[0002] Exterior racking work generally refers not only to exterior sheet metal work for insulating pipes, but also to work to lay insulation on the outer walls of large tanks and other structures, and then cover the exterior with metal plates. Unlike pipe protection, exterior racking work for large tanks involves coating the outer walls of the container with calcium silicate or similar material, and then assembling roughly rectangular sheet metal parts to cover the exterior. The separate sheet metal parts are fabricated on-site and assembled together for construction. The installation of the container pipes, brackets, and other components is primarily performed on-site, relying on the skilled techniques and intuition of workers, who measure the components, transfer the measurements to the sheet metal parts, process them, and then fit them together to form the structure. Therefore, although there have been proposals for improving the materials and joints of the exterior racking work (Patent Document 1), the work is performed based on the skilled techniques and intuition of on-site workers, and the finished product and construction period are currently dependent on the skill level of the workers. Consequently, the on-site measurement, sheet metal transfer, and dimensional adjustments can be time-consuming, resulting in significant work time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2019-27555 Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide a construction method that allows racking work to be performed without relying on the skilled techniques and intuition of workers, and that improves the accuracy of the finished work while at the same time shortening the work time and shortening the construction period. [Means for solving the problem]

[0005] The inventors of the present invention have conducted extensive research, taking into consideration the fact that the processing work of measuring pipes and the like on site and transferring the measurements to sheet metal requires skill, making the work complicated, and that it takes time to adjust for any deviations in the accuracy of the on-site processing. As a result, they have found that: 1) when performing exterior racking work, it is essential to minimize on-site work, and that by dividing the entire reactor vessel into assembly parts based on the design drawings and creating an assembly drawing that determines the assembly order, 2) by creating a processing drawing for the divided sheet metal parts based on the assembly drawing and creating the divided sheet metal parts in advance at the factory, exterior racking work can be performed with simple on-site work without requiring skill, and that the on-site work time, i.e., the construction period, can be shortened more than expected.

[0006] That is, the present invention is an exterior racking construction method in which exterior racking (sheet metal) work is performed to be attached to the exterior of a container such as a large reactor for heat and cold insulation by assembling various divided sheet metal parts manufactured in a factory, A) A process of determining the part division and assembly order according to the container dimensions and mounting member positions based on the design drawing of the protected reaction container, and creating an on-site racking assembly instruction drawing; B) A process of dividing the divided sheet metal parts into common standard parts and processed parts taking into consideration the installation of piping, brackets, etc., based on the racking assembly instruction drawing, and creating a processing drawing for each divided sheet metal part; C) a step of manually or automatically preparing each divided sheet metal part in advance in a factory based on the divided sheet metal part processing drawing; D) An exterior racking method comprising a process of assembling each of the processed divided sheet metal parts on-site in accordance with the racking assembly instruction drawing. In the present invention, when creating the divided parts processing drawing, it is preferable to divide the divided sheet metal part into two parts along a vertical dividing line taking into account the piping positions, and to place the piping processing positions on the left and right ends of the divided sheet metal part, and when creating the divided parts processing drawing, it is preferable to divide the top plate circumferentially and the torso heightwise equally, and form a division pattern so that the number of standard parts becomes large. Also, when creating the divided parts processing drawing, it is preferable to divide the torso into upper, middle, and lower parts, and form a division pattern so that the number of standard parts for the middle part becomes large. [Effects of the Invention]

[0007] According to the present invention, processing drawings for the multiple divided sheet metal parts required for exterior racking work are created based on various parts assembly instruction drawings created in a factory based on the design drawings of the protected container, and standard parts and processed parts are provided, so that workers only need to assemble the standard parts and various processed parts on site according to the divided parts assembly instruction drawings, which provides excellent work accuracy and efficiency and shortens the exterior racking construction period. Furthermore, while in the past, on-site measurement and sheet metal processing involving sheet metal transfer required expertise, according to the present invention, various part assembly instruction drawings are created based on the design drawings for the protected container, and divided part processing drawings are created based on these. As a result, the divided parts can be cut out, bent, and provided as an assembled set in a factory equipped with processing equipment such as an NCN laser cutting machine, and therefore, the processing work does not require expertise.

[0008] Furthermore, in the present invention, the standard parts are divided into predetermined groups, preferably multiples of 4, based on the outer circumferential dimensions of the container, while the various processed parts are made using standard parts, so that part assembly does not become complicated. Also, the processed parts may be machined using evenly divided standard parts, but if they are machined as nozzle-divided parts that form one nozzle hole with a pair of adjacent parts, on-site alignment can be easily achieved by fine adjustment during assembly. [Brief explanation of the drawings]

[0009] [Figure 1A]FIG. 1 is a plan view of the ceiling of a reactor to which exterior racking is applied in accordance with the present invention. [Figure 1B] FIG. 1B is a side view of the reactor with exterior racking of FIG. 1A. [Figure 2] FIG. 1 is a perspective view of the exterior of a reaction vessel to which exterior racking work has been applied. [Figure 3A] This is a part assembly instruction diagram for assigning the top section divided parts of Figure 1A to nozzle division. [Figure 3B] This is a part assembly instruction diagram for equally dividing the top section divided parts allocation of Figure 1A. [Figure 4] FIG. 1C is a side view showing the attachment of divided parts to the entire body of the reaction vessel of FIG. 1B. [Figure 5] FIG. 5 is an assembly instruction diagram showing the entire body of FIG. 4 in an expanded state, illustrating the assembly order and positions. [Figure 6] This is an exploded view (a) of the sheet metal cut-out of the top plate part of the present invention, a back view (b) of the top plate part made by bending the left side edge and periphery of the cut-out sheet metal, and a back plan view (c) showing the combination of the top plate part with adjacent parts. [Figure 7A] 1A is a cut-out diagram of the upper body part of the present invention, and FIG. 1D is a plan view of the back side of the completed upper part that is processed by bending the cut-out sheet metal. [Figure 7B] 7B is an explanatory diagram of the first processing step (c) and the second processing step (b) from cutting out (a) to completion (d) in FIG. 7A. FIG. [Figure 8] 1A is a cut-out diagram of a sheet metal intermediate part of the torso section of the present invention, FIG. 1B is an explanatory diagram of bending the cut-out sheet metal, and FIG. 1C is a plan view of the back side of the completed intermediate sheet metal part. [Figure 9] 1A is a cut-out diagram of the lower body part of the present invention, FIG. 1B is an explanatory diagram of bending the cut-out sheet metal, and FIG. 1C is a plan view of the back side of the completed lower body part. [Figure 10] This is a process diagram for creating split part assembly instructions and split part processing drawings from design drawings, and creating various split parts. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention comprises a combination of various sheet metal parts 10, 20, 30, and 40 and an assembly instruction diagram 50. As shown in FIG. 3A or 3B, the top plate sheet metal part 10 is made up of multiple top plate divided parts 11 (see FIG. 6). As shown in FIGS. 4 and 5, the body is made up of an upper sheet metal part 20, a middle sheet metal part 30, and a lower sheet metal part 40. The upper body part 20 is made up of multiple upper divided parts 21 (see FIG. 7), the middle body part 30 is made up of multiple middle divided parts 31 (see FIG. 8), and the lower body part 40 is made up of multiple lower divided parts 41 (see FIG. 9). When these various sheet metal parts 10, 20, 30, and 40 are assembled, the reaction vessel 100 of FIGS. 1A and 1B is fitted with exterior racking and takes the form shown in FIG. 2.

[0011] The present invention is a combination for exterior racking (sheet metal) work that is attached to the exterior of a vessel such as a large reactor for heat and cold insulation, and is carried out as follows. (1) Based on the design drawings or design data of the reaction vessel to be protected, the part division and assembly sequence are determined according to the vessel dimensions and the positions of the mounting members, and racking assembly instructions for the site (Fig. 3A or B and Fig. 5) are created. As shown in Fig. 1A, the reaction vessel 100 has various pipes, such as a large pipe 111, a medium-sized pipe 112, a small pipe 113, and a smallest pipe 114, in the upper part 110, and as shown in Fig. 1B, a large pipe 121, a medium-sized pipe 122, a small pipe 123, a bracket 124, a nameplate 125, and a scaffolding attachment 126 are attached to the body 120, so the necessary processing is performed in advance at the factory on the divided parts 10, 20, 30, and 40. (2) The parts are divided into common standard parts and processed parts that are processed according to the installation of piping, brackets, etc. (3) The standard parts are divided into the top plate and the upper, middle, and lower parts of the body, and cut out into separate parts. (4) The processed parts are machined by marking or cutting the processed parts according to the positions of the mounting members such as pipes and brackets, with or without using standard parts. Marking the lines makes it easy to make fine adjustments on site. (5) The standard parts and processed parts are assembled on-site based on the racking assembly instruction drawings to carry out exterior racking work.

[0012] (Creating assembly instructions from design drawings) The reactor design drawings of Figures 1A and 1B are divided into the top plate 10 and the body sections 20, 30, and 40, and the part assembly instruction diagrams of Figures 3A or 3B and 5 are created. This procedure can be performed using a computer as follows, and the processing procedure shown in Figure 10 can be configured as follows. (Processing procedure) Design drawing → Input of design data and data analysis → Decision on division method (equal division or nozzle division) → Decision on division data → Creation of assembly instruction diagram → Creation of processing diagram for each divided part → Cutting process → Bending process → Completion of divided parts That is, by reading design data from the design drawings and analyzing the data taking into account the overall size, the size and position of the piping, the bracket position, etc., and deciding whether to use the nozzle division method (Fig. 3A) or the equal division method (Fig. B) for the top plate 10 and inputting it, the division data is calculated, and a top plate assembly instruction diagram consisting of the appropriately divided divided parts and a body assembly instruction diagram for the divided parts in which the body is divided into upper part 20, middle part 30, and lower part 4 are created. This can be done manually, but by inputting data such as the size, height, size and position of the nozzles, etc. from the design drawings, as well as various data on the appropriate division size and whether the nozzle division method or the equal division method is used, a computer can calculate the top plate assembly instruction diagram in Fig. 3A or B and the body assembly instruction diagram in Fig. 4 and Fig. 5 to create appropriate assembly instruction diagrams. Specifically, it is preferable to divide the circumferential direction in multiples of four, but in Figure 3B, the part is divided into 12 equal parts at 30 degrees, and the specified nozzle processing is performed. Therefore, the large pipe 110 and nozzle holes for each pipe are processed in the 12 divided parts 11-(1) to 11-(12). On the other hand, in Figure 3A, the part is divided so that the pipe nozzle is divided into two parts, taking into account the pipe position, and the other parts are divided so that there are more standard parts. In the height direction, the middle part 30 is divided equally, except for the upper body part 10 and the lower body part 40, and in the circumferential direction, it is divided equally, and nozzle division is used as needed. The upper body portion 10 is divided into two sections, upper and lower, and is composed of a lower section part 10-1 with the upper end cut off and an upper section part 10-2 with a hanging hook. The lower body portion 40 is formed slightly higher than the middle section 30, and the nozzle is divided into two sections, and mounting parts for the nozzle holes of the large diameter pipe 121, medium size pipe 122 and small size pipe 123, bracket 124, nameplate 125 and ladder 26 are formed.

[0013] (Creating separate part machining diagrams from assembly instructions) Once the main parts 10a, 20a, 30a and 40a of each divided part are determined in the assembly instruction drawing, the supplementary parts that form the necessary parts for joining around them are calculated, and the cut-out drawings (Figures 6(a), 7(a), 8(a) and 9(a)) for each divided part 10, 20, 30 and 40, which will be described later, are created, and the necessary bending and cutting processes are performed.

[0014] (Creating split parts from split part processing drawings) Once the cutting diagrams (Figures 6(a), 7(a), 8(a), and 9(a)) are obtained, a template can be created and cut manually based on this, or various divided parts can be cut out from the coil material using computer control based on the cutting diagrams using a processing machine such as a CNC laser automatic cutting machine. Details are as follows.

[0015] (Creating the top panel division parts) If the top plate of the standard part is circular, it is divided circumferentially into a fan shape with a rounded apex, forming joints 12 with adjacent parts on both left and right edges, while forming joints 13 with the upper end of the upper body part (described later) at the outer circumferential edge. Specifically, as shown in FIG. 6, the divided parts 11 of the top plate 10 are cut out into a part cutout having a fan-shaped main part 11a with a 30-degree angle, dividing 360 degrees into 12 parts, and a folding edge at its left end with an inner folding line 11b and an outer folding line 11c, and a folding edge with a folding line 11d that folds up to the outer periphery (FIG. 6(a)). This is folded along folding lines 11b and 11c into the shape shown in FIG. 6(b), forming folding joints 12 and rising joints 13. When these are combined at the left and right edges, adjacent divided parts 11, 11 are combined via joints 12, resulting in the joined state shown in FIG. 6(c).

[0016] (Creating the divided torso parts) The body of the standard part is preferably divided into an upper part 20, multiple middle parts 30, and a lower part 40 according to the height of the container (see Figure 5), with the division being made so that there are many common middle standard parts 30. On the other hand, it is divided in the circumferential direction according to the apex angle division angle shown in Figure 3A or B. The upper body part 20 has an end 22 at its upper end that engages with the joint of the outer circumferential edge 13 of the top plate segment part 11.

[0017] (Creating the upper torso parts) As shown in FIG. 7A, the upper body part 20 is composed of multiple divided sheet metal parts 21 cut from a coil material and processed. Each divided sheet metal part 21 is cut from the coil material and is formed to have a central main portion 21a and a folded edge 21b surrounding the central main portion 21a, forming a receiving portion 22 on the upper side that receives the insertion 13 of the end of the top panel divided part 11, a folded edge 21c on the left side that forms a left joint 23, a folded edge 21d on the right side that forms a right joint 25, and a folded edge 21e on the lower side that forms a lower joint 24. These folded edges are folded to form the respective joints 22, 23, 24, and 25, and are finally finished into the completed shape shown in FIG. 7A(d). That is, as shown in FIG. 7B, (1) the upper joint 22 is formed by folding the folded edge 21b of the cutout along the inner back fold line 22a, and (2) folding it up along the outer back fold line 22b to form the joint 22 with an N-shaped cross section (see FIG. 7B(e)). (3) The left joint 23 is formed by folding the folded edge 21c inside along the inside fold line 23a, while (4) the right joint 25 is formed by folding the folded edge 21d inside along the inside fold line 25a on the front side. (5) The bottom joint 24 is formed by folding the folded edge 21e upward along the inside fold line 24a, and then (6) folding it down outward along the outside fold line 24b.

[0018] (Forming the divided parts in the middle of the body) Next, as shown in FIG. 8, the intermediate torso section 30 is composed of multiple divided sheet metal parts 31 cut from coil material and processed. As shown in FIG. 8(A), each divided sheet metal part 31 is cut from the coil material and is formed so as to surround the central main section 31a, with an insertion piece 31b on the upper side for the lower joint 24 of the upper torso section part, a bent edge 31c on the left side forming the left joint 32, a bent edge 31e on the right side forming the right joint 33, and a bent edge 31d on the lower side forming the lower joint 34. These bent edges are bent to form the respective joints 32, 33, and 34, and finally, the completed shape shown in FIG. 8(c) is obtained. That is, as shown in FIG. 8(b), (1) the left joint 32 is formed by folding the bent edge 31c back along the inner back fold line 32a. On the other hand, (2) the right joint 33 is formed by folding the bent edge 31e inward on the front side along the inner fold line 33a. The lower joint 34 is formed by (3) first folding the folded edge 31d upward along the inner folding line 34a, and then (4) folding it down outward along the outer folding line 34b.

[0019] (Creating the lower torso parts) Finally, as shown in FIG. 9, the lower body section 40 is composed of multiple divided sheet metal parts 41 cut from coil material and processed. Each divided sheet metal part 41 is cut from the coil material and is formed so as to surround a central main portion 41a, with an upper insertion piece 41b for insertion into the lower joint 34 of the intermediate body part, a bent edge 41c on the left side forming the left joint 42, a bent edge 41d on the right side forming the right joint 43, and a bent edge 41e on the lower side forming the lower joint 44. These bent edges are bent to form the joints 42, 43, and 44, resulting in the final finished shape shown in FIG. 9(c). That is, as shown in FIG. 9(b), (1) the left joint 42 is formed by folding the bent edge 41b back along the inner fold line 42a. On the other hand, (2) the right joint 43 is formed by folding the bent edge 41d inward on the front side along the inner fold line 43a. The lower joint 44 is formed by (3) first folding the folded edge 41e upward along the inner fold line 44a, and then (4) folding it outward along the outer fold line 44b (note that the lower part of the body is formed in the same way as the joint of the upper top plate when the lower top plate is attached, in the drawing, the folded edge is folded inward and then folded outward, and the end of the flat plate is inserted into the V-shaped part of the cross-section that is folded inwards and then folded outwards).

[0020] (Assembly of separate parts) The above divided parts are assembled from the lower body part 20 to the middle part 30 and upper part 10, and finally the top plate 10 is assembled according to Figure 3A or Figure 3B. When the exterior racking work is performed, the outer wall racking of the reaction vessel shown in Figures 1A and 1B can be applied, resulting in the appearance shown in Figure 2.

[0021] The present invention has been described above based on a representative example, but it relates to an exterior racking method in which assembly instruction drawings for each divided sheet metal part are prepared based on the design drawing of the protected container, divided part processing drawings are prepared based on these, and each divided sheet metal part is pre-processed in a factory based on these, and then assembled on site.As long as it is a method in which assembly instruction drawings for each divided sheet metal part and each divided sheet metal part are prepared in advance, it falls within the technical scope of the present invention, and a person skilled in the art can easily make modifications and changes without departing from the gist of the present invention.

Claims

1. This is an exterior racking construction method in which exterior racking (sheet metal) work is performed to insulate the exterior of a container such as a large reactor by assembling various separate sheet metal parts manufactured in a factory. A) A process of determining the part division and assembly order according to the container dimensions and mounting member positions based on the design drawing of the protected reaction container, and creating racking assembly instructions for the site; B) A process of dividing the divided sheet metal parts into common standard parts and processed parts that take into account the installation of piping, brackets, etc., based on the racking assembly instruction drawing, and creating a processing drawing for each divided sheet metal part; C) A process of manually or automatically preparing each divided sheet metal part in advance in a factory based on the divided sheet metal part processing drawing; D) An exterior racking method comprising the step of assembling each of the processed divided sheet metal parts on-site in accordance with the racking assembly instruction drawing.

2. 2. The exterior racking method according to claim 1, wherein when creating the divided parts processing drawing, the drawing is divided into two parts along a vertical dividing line, taking into account the piping position, and the piping processing positions are positioned at the left and right ends of the divided sheet metal parts.

3. 2. The exterior racking method according to claim 1, wherein when creating the divided parts processing drawing, the top plate is divided equally in the circumferential direction and in the height direction of the torso, and a division pattern is formed so as to increase the number of standard parts to be used.

4. 2. The exterior racking method according to claim 1, wherein, when preparing the divided parts processing drawing, the body is divided into an upper part, a middle part, and a lower part, and a division pattern is formed so that there are more standard parts in the middle part.

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