KR20240013474A - Tuyere shell of furnace and manufacturing method thereof - Google Patents

Abstract

The steel shell structure on the tuyere side of a blast furnace according to the present invention includes a steel shell body in which a plurality of assembly holes are formed along the longitudinal direction of a circular shape; A cylindrical gas holder in which the assembly hole is assembled; And a reinforcement unit installed on the steel shell body and configured to block deformation of the steel shell body when welding and assembling the gas holder to the assembly hole.

Description

Steel shell structure on the tuyere side of a blast furnace and its manufacturing method {TUYERE SHELL OF FURNACE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a steel skin structure on the tuyere side of a blast furnace and a method of manufacturing the same. It relates to a steel skin structure on the tuyere side, which is a part of the blast furnace steel skin, and a method of manufacturing the same.

In general, in the blast furnace process, iron ore as raw materials and coke as fuel are charged through the charging port of the blast furnace, hot air is provided to the inside of the blast furnace through the vent at the bottom of the blast furnace, and the combustion heat and reducing gas generated when the coke is burned are used to produce iron ore. This is a process of producing high-temperature melts (molten iron and slag) by reducing and melting.

At this time, the blast furnace is made up of a fire-resistant cavity that forms the inner wall of the blast furnace, and an iron skin that surrounds this fire-resistant cavity from the outside. At a predetermined height of this blast furnace, tuyeres are installed at a number of locations at regular intervals along the circumferential direction, and are configured to supply high-temperature hot air generated from the outside to the inside of the blast furnace through the tuyeres. In other words, the tuyere is a passage through which hot air from the hot air blower enters the blast furnace so that coke and ore combusts, melts, and reduces the blast furnace.

Meanwhile, as shown in FIG. 1, the steel shell 10 of the blast furnace is divided into a plurality of layers in the longitudinal direction. The tuyere-side steel shell structure 11 is disposed at the bottom of the steel shell of this blast furnace. Since the steel structure 11 on the tuyere side of the blast furnace is substantially large in size, it is manufactured in four blocks at a factory, transported to the site, and then the blocks are assembled and installed at the site.

However, the steel skin structure 11 on the tuyere side of the blast furnace may be deformed by welding when welding the gas holder during manufacturing at the factory, and there is a limit where deformation due to its own weight may occur even when transporting the manufactured block later. .

Republic of Korea Patent Publication No. 10-2005-0006879

The present invention was created to solve the above problems, and its object is to provide a steel shell structure on the tuyere side of a blast furnace and a method of manufacturing the same, which prevents deformation of the steel skin when welding a gas holder and prevents deformation of the steel skin during transportation. There is a purpose.

In order to achieve the above object, the blast furnace tuyere-side steel shell structure according to the present invention includes a steel shell body in which a plurality of assembly holes are formed along the longitudinal direction of a circular shape; A cylindrical gas holder in which the assembly hole is assembled; And a reinforcement unit installed on the steel shell body and configured to block deformation of the steel shell body when welding and assembling the gas holder to the assembly hole.

Here, the reinforcement unit may include a rib plate disposed longitudinally on both sides of the assembly hole, extending longer than the diameter of the assembly hole, and welded and fixed to the steel shell body.

In addition, the rib plates are each positioned between the plurality of assembly holes and arranged to be spaced apart from each other, and the reinforcement unit includes a reinforcement ring member that connects the plurality of rib plates and is welded and fixed to the steel body. It can be included.

Specifically, the reinforcing ring member includes an upper reinforcing ring that connects the upper ends of the plurality of rib plates and is welded and fixed to the upper inner surface of the steel shell body; And a lower reinforcement ring connecting the lower ends of the plurality of rib plates and welded and fixed to the lower inner surface of the steel shell body.

Meanwhile, the steel shell body is made up of a plurality of arc-shaped steel shell unit members connected to each other, a plurality of assembly holes are formed in the steel skin unit member along the longitudinal direction of the arc shape, and a plurality of assembly holes are formed between the plurality of assembly holes. The rib plates may be disposed, and the plurality of rib plates may be connected by the reinforcing ring member.

In addition, the present invention further includes a support body installed on the inner surface of the steel skin unit member, wherein the support body connects both ends of the upper reinforcement ring and connects both ends of the lower reinforcement ring. support beam; a connecting beam connecting the plurality of first support beams; and a plurality of second support beams, one end of which is connected to the first support beam in a vertical direction and the other end of which is connected to the reinforcement ring member, and a plurality of second support beams spaced apart from each other along the longitudinal direction of the first support beam. .

Meanwhile, according to another aspect of the present invention, a steel cover material preparation step of preparing a plurality of iron cover materials in an arc shape; A steel skin unit member forming step of forming a plurality of steel skin unit members by drilling a plurality of assembly holes along the arc-shaped longitudinal direction of each of the steel skin base materials; A reinforcement unit installation step of welding and fixing a reinforcement unit, which includes a plurality of rib plates arranged in the longitudinal direction between the plurality of assembly holes, and a reinforcement ring member connecting the plurality of rib plates, to the steel skin unit member; A gas holder installation step of welding and fixing a cylindrical gas holder to the assembly hole; And a steel shell body forming step of connecting a plurality of the steel shell unit members to form a circular steel shell body. A method of manufacturing a steel shell structure on the tuyere side of a blast furnace including a.

At this time, in the steel shell preparation step, the plurality of arc-shaped steel shell materials are provisionally assembled into a circular shape, and in the steel skin unit member forming step, the assembly holes are formed in the plurality of the provisionally assembled steel shell materials to form a plurality of the steel shell materials. The steel skin unit member is maintained in a pre-assembled state in a circular shape, and the gas holder installation step is performed by forming a set of the two assembly holes facing each other with the center of the circular shape in between, and installing the two assembly holes in the assembly hole for each set. The gas holder can be welded for each set.

Specifically, in the gas holder installation step, welding for each set may be performed sequentially along the longitudinal direction of the circular shape.

In addition, before the gas holder installation step, the present invention includes a plurality of first support beams extending toward both ends of the reinforcing ring member, a connecting beam connecting the plurality of first support beams, and a connection beam perpendicular to the first support beam. It may further include a support installation step of welding and fixing a support made of a second support beam connected and extending toward the reinforcement ring member to the reinforcement ring member.

The present invention has the effect of preventing the steel shell body from bending when welding the gas holder to the assembly hole by forming a reinforcement unit around the steel shell body.

In addition, the present invention includes a support body installed on the reinforcing ring member to support the steel skin unit member, thereby preventing the steel skin unit member from bending when welding the gas holder to the assembly hole, and when transporting the steel skin unit member. It has the advantage of being able to support stably and firmly.

In addition, the present invention is configured to weld each set of assembly holes facing each other with the center of the circle in between when welding and fixing the gas holder to the assembly hole, thereby reducing the variation in welding amount due to welding heat, thereby deforming the steel body. It has the advantage of preventing.

Figure 1 is a diagram showing the blast furnace shell.
Figure 2 is a diagram showing the process of welding a gas holder to the assembly hole of the steel skin unit member according to the prior art when manufacturing the tuyere side steel structure among the blast furnace steel skins of Figure 1.
Figures 3 and 4 are views showing the steel skin structure on the tuyere side of the blast furnace according to the present invention.
Figure 5 is a longitudinal cross-sectional view showing the steel skin structure on the tuyere side of the blast furnace of Figure 4.
Figure 6 is a diagram showing transportation of a conventional steel skin unit member.
Figure 7 is a view showing transport of the steel skin unit member of the present invention.
Figure 8 is a flow chart showing the manufacturing method for the steel skin structure on the tuyere side of the blast furnace of Figure 3.
Figure 9 is a diagram showing the order in which welding of the gas holder is performed for each set of assembly holes along the longitudinal direction of the steel shell body in the gas holder installation step of the manufacturing method of Figure 3.

Hereinafter, with reference to the attached drawings, preferred embodiments will be described in detail so that those skilled in the art can easily practice the present invention. However, when describing preferred embodiments of the present invention in detail, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the same symbols are used throughout the drawings for parts that perform similar functions and actions. In addition, in this specification, terms such as 'top', 'top', 'upper surface', 'bottom', 'bottom', 'bottom', 'side', etc. are based on the drawings, and in reality, the components are arranged It may vary depending on the direction in which it takes place.

Additionally, throughout the specification, when a part is said to be 'connected' to another part, this is not only the case when it is 'directly connected', but also when it is 'indirectly connected' with another component in between. Also includes. In addition, 'including' a certain component means that other components may be further included rather than excluding other components, unless specifically stated to the contrary.

Figure 2 is a diagram showing the process of welding a gas holder to the assembly hole of the steel skin unit member according to the prior art when manufacturing the tuyere side steel structure among the blast furnace steel skins of Figure 1.

Referring to the drawings, the steel skin unit member 1 according to the prior art is fixed by welding a cylindrical gas holder 2 to the assembly hole 1a drilled during manufacturing. However, when welding the gas holder 2 to the assembly hole 1a in the steel skin unit member 1, the edge portions of the assembly hole 1a in the steel skin unit member 1 may be deformed to a certain degree by the welding heat. That is, the edge portions of the assembly hole (1a) in the steel skin unit member (1) originally have a structure arranged vertically in the longitudinal direction, but there is a limit where the portion on the side of the assembly hole (1a) can be bent outward due to welding heat. .

In order to overcome the above-mentioned limitations, the tuyere-side steel skin structure 100 of the blast furnace according to the present invention is configured with a reinforcement unit 130 as shown in Figures 3 to 5 below.

Figures 3 and 4 are views showing the tuyere-side steel skin structure of the blast furnace according to the present invention, and Figure 5 is a longitudinal cross-sectional view showing the tuyere-side steel skin structure of the blast furnace of Figure 4.

Referring to the drawings, the blast furnace tuyere-side steel shell structure 100 according to the present invention includes a steel shell body 110, a gas holder 120, and a reinforcement unit 130.

The steel shell body 110 is a shell member disposed on the tuyere side of the blast furnace, and has a structure in which a steel plate is bent into a circular shape. This steel shell body 110 is made up of a plurality of arc-shaped steel skin unit members 111 connected to each other. The steel shell body 110 has a plurality of assembly holes 111a formed along the longitudinal direction of a circular shape. That is, a plurality of assembly holes 111a are formed at regular intervals from each other along the longitudinal direction of the steel shell body 110.

Additionally, the gas holder 120 has a cylindrical structure to implement a tuyere shape. This gas holder 120 is assembled and fixed to the assembly hole 111a of the steel shell body 110. The gas holder 120 is arranged laterally inside the steel shell body 110 and is fixed to the steel shell body 110 by having an edge welded to the edge of the assembly hole 111a in the steel shell body 110.

And the reinforcement unit 130 is installed on the steel shell body 110 and is configured to block deformation of the steel shell body 110 when welding and assembling the gas holder 120 to the assembly hole 111a.

Specifically, the reinforcement unit 130 includes a leaf plate and a reinforcement ring member 132.

The rib plate 131 is disposed on both sides of the assembly hole 111a. This rib plate 131 has a longitudinally long structure and extends longer than the diameter of the assembly hole 111a. That is, the rib plate 131 is disposed on one side and the other side of the assembly hole 111a, and extends longitudinally longer than the diameter of the assembly hole 111a, so that the upper end is located higher than the upper part of the assembly hole 111a and the other end is It is located lower than the lower part of the assembly hole (111a). The rib plate 131 is welded and fixed to the steel shell body 110. In this way, the rib plate 131 is welded and fixed to the steel shell body 110 in a vertically extending state on both sides of the assembly hole 111a, so that the longitudinal axis of the steel skin body 110 is maintained. By fixing the directional parts to each other, it is possible to prevent the steel shell body 110 from bending when welding the gas holder 120 to the assembly hole 111a.

In addition, the reinforcing ring member 132 connects a plurality of rib plates 131 and is fixed to the steel shell body 110 by welding. The rib plates 131 are positioned between the plurality of assembly holes 111a and spaced apart from each other, and a reinforcing ring member 132 connects the plurality of rib plates 131. In this way, the reinforcing ring member 132 is welded and fixed to the steel shell body 110 while connecting the plurality of rib plates 131 in a horizontally arranged state, so that the plurality of rib plates 131 are fixed to each other and the steel skin is By fixing the transverse portions of the body 110 to each other, it is possible to further prevent the steel body 110 from bending when welding the gas holder 120 to the assembly hole 111a.

Specifically, the reinforcement ring member 132 may include an upper reinforcement ring (132a) and a lower reinforcement ring (132b).

The upper reinforcement ring (132a) connects the upper ends of the plurality of rib plates (131) and is welded and fixed to the upper part of the inner surface (111b) of the steel shell body (110). The lower reinforcement ring (132b) connects the lower ends of the plurality of rib plates (131) and is welded and fixed to the lower part of the inner surface (111b) of the steel shell body (110). In this way, the reinforcement ring member 132 connects the upper ends of the plurality of rib plates 131 with the upper reinforcement ring 132a, and the lower reinforcement ring 132b connects the lower ends of the plurality of rib plates 131, respectively, to the steel body 110. ) by welding and fixing it to the inner surface (111b), thereby firmly connecting the plurality of rib plates (131), so that the steel body (110) is It can prevent bending more firmly.

Meanwhile, the steel shell body 110 may be formed by connecting arc-shaped steel skin unit members 111 to each other. At this time, a plurality of assembly holes 111a are formed in the steel skin unit member 111 along the longitudinal direction of an arc shape, a plurality of rib plates 131 are disposed between the plurality of assembly holes 111a, and a plurality of The rib plates 131 may have a structure connected by the reinforcing ring member 132. The reinforcement unit 130 consisting of the rib plate 131 and the reinforcement ring member 132 prevents the deformation of the steel skin unit member 111 when the gas holder 120 is welded and fixed to the assembly hole 111a of the steel skin end member. can be prevented.

And the present invention may further include a support 140.

The support body 140 is installed on the reinforcing ring member 132. Specifically, the support body 140 may include a first support beam 141, a connecting beam 142, and a second support beam 143.

A plurality of first support beams 141 are arranged to connect both ends of the upper reinforcement ring 132a and both ends of the lower reinforcement ring 132b. Additionally, the connecting beam 142 connects the plurality of first support beams 141, and at least one connecting beam 142 may be disposed. The second support beam 143 has one end connected to the first support beam 141 in a vertical direction and the other end connected to the reinforcing ring member 132. A plurality of second support beams 143 are spaced apart from each other along the longitudinal direction of the first support beam 141.

The support 140 configured in this way, together with the reinforcement unit 130 described above, can prevent deformation of the steel skin unit member 111.

Furthermore, the steel skin unit member 111 of the present invention can be stably transported while preventing deformation by the support 140 during transportation. As shown in Figure 6, when the conventional steel shell unit member 11 is transported by a transportation vehicle (T), there is no separate support member, so the middle part of the steel skin unit member 11 may be deformed due to its own weight. there is. In contrast, as shown in FIG. 7, the steel skin unit member 111 of the present invention is firmly supported by the support 140, so that no deformation occurs. Specifically, the plurality of second support beams 143 each have lengths extending differently upward so that the virtual connection line connecting the upper ends corresponds to the arc shape of the steel skin unit member 111. That is, the support body 140 has a plurality of second support beams 143 having a structure corresponding to the arc-shaped steel skin unit member 111, thereby supporting the steel skin unit member 111 in the loading part of the transportation vehicle (T). By stably and firmly supporting the steel skin unit member 111, it prevents deformation of the steel skin unit member 111 and ensures stable transportation of the steel skin unit member 111.

Meanwhile, after a plurality of steel shell unit members 111 are connected in the field to form a steel shell body 110 and the steel shell body 110 is installed in the blast furnace, such support 140 can be removed from the reinforcement ring member 132. You can.

Figure 8 is a flow chart showing the manufacturing method for the steel shell structure 100 on the tuyere side of the blast furnace of Figure 3, and Figure 9 shows that in the gas holder installation step of the manufacturing method of Figure 3, the gas holder is welded in the longitudinal direction of the steel shell body. This is a drawing showing the order of each set of assembly holes.

Referring to Figures 3, 4, 8 and 9, the manufacturing method for the steel skin structure 100 on the tuyere side of the blast furnace according to the present invention includes a steel skin material preparation step (S100) and a steel skin unit member forming step (S200). , a reinforcement unit installation step (S300), a gas holder installation step (S500), and a steel skin body forming step (S600).

First, the steel cover material preparation step (S100) is a step of preparing a plurality of arc-shaped steel cover materials (not shown). This steel cover material preparation step (S100) can be performed in a factory, and a plurality of arc-shaped iron cover materials prepared in this way can be provisionally assembled into a circular shape. Of course, temporary assembly can be canceled after the gas holder installation step (S500) and before moving to the site.

Next, the steel skin unit member forming step (S200) is a step of forming the steel skin unit member 111 by drilling an assembly hole 111a in the steel skin base material. That is, in the steel skin unit member forming step (S200), a plurality of assembly holes 111a are drilled along the arc-shaped longitudinal direction of each steel skin base material to form a plurality of steel skin unit members 111.

Next, the reinforcement unit installation step (S300) is a step of welding and fixing the reinforcement unit 130 to the steel skin unit member 111. Specifically, in the reinforcement unit installation step (S300), a plurality of rib plates 131 are arranged in the longitudinal direction between a plurality of assembly holes 111a, and the plurality of rib plates 131 are connected with a reinforcement ring member 132. , the reinforcement unit 130 consisting of a plurality of rib plates 131 and the reinforcement ring member 132 is welded and fixed to the steel skin unit member 111.

Next, the gas holder installation step (S500) is a step of welding and fixing the cylindrical gas holder 120 to the assembly hole 111a of the steel skin unit member 111. However, in the steel cover material preparation step (S100) before the gas holder installation step (S500), a plurality of arc-shaped steel cover materials are provisionally assembled into a circular shape, and in the subsequent steel cover unit member forming step (S200), a plurality of provisionally assembled steel materials are An assembly hole 111a is formed in the shell material to maintain the plurality of steel shell unit members 111 provisionally assembled in a circular shape. The next gas holder installation step (S500), as shown in FIG. 9, is a set of two assembly holes (111a) facing each other with the center of the circle in between, and an assembly hole (111a) for each set. ), welding the gas holder 120 in each set. As an example, in Figure 9, the No. 1 assembly hole (111a) and the No. 22 assembly hole (111a) facing each other with the center of the circle in between are one set, and the No. 1 assembly hole (111a) and the No. 22 assembly hole (111a) ) After welding and fixing the gas holder 120 to each of the other sets of assembly holes 111a, the gas holder 120 is welded and fixed to each of the assembly holes 111a.

In this way, as the gas holder 120 is welded and fixed to the assembly hole 111a for each set in the gas holder installation step (S500), deformation of the steel skin can be prevented by reducing the variation in welding amount due to welding heat. .

Furthermore, in the gas holder installation step (S500), welding for each set may be performed sequentially along the longitudinal direction of the circular shape. As an example, after welding and fixing the gas holder 120 to each of the No. 1 assembly hole (111a) and No. 22 assembly hole (111a) of one set, the gas holder 120 is welded and fixed to each of the No. 2 assembly hole (111a) and No. 23 assembly hole (111a) of the next set in a clockwise direction. Welding can be done for each set, similar to the method of welding and fixing the gas holder 120 to (111a).

In this way, in the gas holder installation step (S500), welding for each set is performed sequentially in a clockwise or counterclockwise direction, thereby further reducing the variation in welding amount due to welding heat, thereby further preventing deformation of the steel skin.

Finally, in the steel skin body forming step (S600), a plurality of steel skin unit members 111 are connected to form a circular steel skin body 110. In the steel skin body forming step (S600), a plurality of steel skin unit members 111 are welded and connected with ends facing each other to form a single steel skin body 110 connected in a circular shape. In this steel skin body forming step (S600), a plurality of steel skin unit members 111 manufactured at the factory are transported to the site by a transportation vehicle (T), and then the plurality of steel skin unit members 111 are welded and fixed to each other at the site. It comes true.

Meanwhile, the present invention may further include a support installation step (S400) before the gas holder installation step (S500). Specifically, the support installation step (S400) is a step of welding and fixing the support 140 to the steel skin unit member 111. At this time, the support body 140 includes a plurality of first support beams 141 extending toward both ends of the reinforcement ring member 132, a connecting beam 142 connecting the plurality of first support beams 141, and a first support beam. It may be composed of a second support beam 142 that is vertically connected to (141) and extends toward the reinforcing ring member 132.

Here, the welding fixation of the support body 140 to the reinforcing ring member 132 is such that the first support beam 141 is welded and fixed to both ends of the reinforcing ring member 132, and one end of the second support beam 143 is fixed to the reinforcing ring member 132 by welding. The other end of the first support beam 141 is welded and fixed to the reinforcing ring member 132. Meanwhile, after a plurality of steel shell unit members 111 are connected in the field to form a steel shell body 110 and the steel shell body 110 is installed in the blast furnace, such support 140 can be removed from the reinforcement ring member 132. You can.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will recognize that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will understand. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

100: Steel skin structure on the tuyere side of the blast furnace 110: Steel skin body
111: steel skin unit member 111a: assembly hole
120: Gas holder 130: Reinforcement unit
131: Rib plate 132: Reinforcement ring member
132a: upper reinforcement ring 132b: lower reinforcement ring
140: support 141: first support beam
142: connecting beam 143: second support beam
S100: Steel shell material preparation step S200: Steel skin unit member formation step
S300: Reinforcement unit installation step S400: Support installation step
S500: Gas holder installation step S600: Steel shell body formation step

Claims (10)

A steel body having a plurality of assembly holes formed along the longitudinal direction of a circular shape;
A cylindrical gas holder in which the assembly hole is assembled; and
A reinforcement unit installed on the steel shell body and configured to block deformation of the steel shell body when welding and assembling the gas holder to the assembly hole;
A steel skin structure on the tuyere side of a blast furnace containing a.
According to paragraph 1,
The reinforcement unit is,
A rib plate disposed longitudinally on both sides of the assembly hole, extending longer than the diameter of the assembly hole, and welded and fixed to the steel shell body;
A steel skin structure on the tuyere side of a blast furnace containing a.
According to paragraph 2,
The rib plates are each positioned between the plurality of assembly holes and arranged to be spaced apart from each other,
The reinforcement unit is,
A reinforcing ring member connecting a plurality of the rib plates and welded and fixed to the steel shell body;
A steel skin structure on the tuyere side of a blast furnace further comprising a.
According to paragraph 3,
The reinforcing ring member,
An upper reinforcement ring connecting the upper ends of the plurality of rib plates and welded and fixed to the upper inner surface of the steel shell body; and
A lower reinforcement ring connecting the lower ends of the plurality of rib plates and welded and fixed to the lower inner surface of the steel shell body;
A steel skin structure on the tuyere side of a blast furnace containing a.
According to paragraph 4,
The steel shell body is made up of a plurality of arc-shaped steel skin unit members connected to each other,
A plurality of assembly holes are formed in the steel unit member along the longitudinal direction of an arc shape, a plurality of rib plates are disposed between the plurality of assembly holes, and the plurality of rib plates are connected by the reinforcement ring member. Steel skin structure on the tuyere side of a blast furnace.
According to clause 5,
It further includes a support body installed on the reinforcing ring member,
The support is,
a plurality of first support beams connecting both ends of the upper reinforcement ring and connecting both ends of the lower reinforcement ring;
a connecting beam connecting the plurality of first support beams; and
a plurality of second support beams spaced apart along the longitudinal direction of the first support beam, one end of which is connected to the first support beam in a vertical direction and the other end of which is connected to the reinforcing ring member;
A steel skin structure on the tuyere side of a blast furnace containing a.
A steel covering material preparation step of preparing a plurality of arc-shaped steel covering materials;
A steel skin unit member forming step of forming a plurality of steel skin unit members by drilling a plurality of assembly holes along the arc-shaped longitudinal direction of each of the steel skin base materials;
A reinforcement unit installation step of welding and fixing a reinforcement unit, which includes a plurality of rib plates arranged in the longitudinal direction between the plurality of assembly holes, and a reinforcement ring member connecting the plurality of rib plates, to the steel skin unit member;
A gas holder installation step of welding and fixing a cylindrical gas holder to the assembly hole; and
A steel shell body forming step of connecting a plurality of the steel shell unit members to form a circular steel shell body;
A method of manufacturing a steel skin structure on the tuyere side of a blast furnace comprising a.
In clause 7,
In the steel shell preparation step, the plurality of arc-shaped steel shell base materials are provisionally assembled into a circular shape, and in the steel shell unit member forming step, the assembly holes are formed in the plurality of provisionally assembled steel shell base materials to form a plurality of the steel shell units. The members remain provisionally assembled in a circular shape,
The gas holder installation step is,
A method of manufacturing a tuyere-side steel structure of a blast furnace in which the two assembly holes facing each other with the center of the circle in between are set as a set, and the gas holder is welded to the assembly hole for each set.
According to clause 8,
In the gas holder installation step,
A method of manufacturing a steel skin structure on the tuyere side of a blast furnace in which the welding for each set is performed sequentially along the longitudinal direction of the circular shape.
In clause 7,
Before the gas holder installation step,
A plurality of first support beams extending toward both ends of the reinforcing ring member, a connecting beam connecting the plurality of first support beams, and a second support vertically connected to the first support beam and extending toward the reinforcing ring member. A support installation step of welding and fixing a support made of a beam to the reinforcing ring member;
A method of manufacturing a steel skin structure on the tuyere side of a blast furnace, further comprising:

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