JP2012107305A - Method for constructing blast furnace bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing a blast furnace bottom, which can simplify a filler application step and can attain good cooling performance.SOLUTION: This method comprises performing an installation step of installing on a base 5 a beam frame structure 11 provided with a plurality of cooling tubes 16 arranged, a closure step of closing the top of a space part 20U by laying a bottom plate 14 on the main beam member 111, and the filling step of filling a castable 17 into the space part 20U closed in the closure step to surround the cooling tubes 16 with the castable 17 and to closely adhere the castable 17 to a bottom plate 14.

Description

  The present invention relates to a method for constructing a blast furnace bottom, and can be used for constructing a bottom part of a blast furnace.

The blast furnace reaches the end of its life in 15 to 20 years due to wear and tear of the refractory at the bottom of the blast furnace, and refurbishment including refractory rewinding is performed.
In order to reduce the wear of refractories at the bottom of the furnace, in conventional blast furnaces, a cooling zone called a stave cooler with embedded water-cooled pipes is installed on the side, and a water-cooled pipe is embedded on the bottom to enhance cooling. Thus, a protective layer is formed at the contact interface with the hot metal. Between these cooling parts and refractories, a refractory material with high thermal conductivity is filled so as not to impair the cooling ability.

For the furnace bottom portion, a highly rigid beam assembly is used so that the huge weight of the furnace body is not directly applied to the piping.
A beam-framed structure is a structure that uses a long steel material to increase its rigidity. A plurality of main beam materials are installed in parallel on the foundation, and these are joined together by cross-beam materials to form a cross-beam shape as a whole. Built in.
In order to prevent gas leakage from the inside of the furnace, a bottom plate is installed and blocked on the beam structure. Although the furnace body of a blast furnace may be formed on the upper surface of a beam structure, the structure enclosed inside a furnace body iron skin is also employ | adopted.

There exists patent document 1 as an example of such a beam structure and a refractory material.
In Patent Document 1, a plurality of main beam members to be a beam assembly are arranged in parallel, and each is surrounded by an iron skin of a furnace body. The space formed between the beam members is filled with the filler in a plurality of times.
That is, a secondary concrete layer is laid on the foundation concrete layer in the space, and a cooling pipe is installed thereon. A high heat conductive filler such as a graphite stamp material or silicon carbide (SiC) castable is filled above and below the cooling pipe without gaps. A steel bottom plate is stretched on the upper surface of these two layers of high thermal conductive filler, and the refractory brick layer inside the furnace body is constructed on this bottom plate.

  Here, when the bottom plate is stretched, a gap is inevitable between the upper surface of the filler filled in the space portion. However, if a gap remains between the filler and the bottom plate, heat transfer from the inside of the furnace through the bottom plate becomes insufficient. Due to such a gap, the desired cooling effect by the cooling pipe cannot be obtained, and the wear of the filler is affected. In order to avoid such problems, in the gaps described above, a filler with improved fluidity is press-fitted with a large number of openings in the bottom plate to ensure adhesion and heat transfer between the bottom plate and the filler. Yes.

JP 2008-156133 A

However, in the procedure of Patent Document 1 described above, the filling operation around the cooling pipe is as many as three stages (below the pipe, above the pipe, and press-fitting into the gap), and the man-hours cannot be reduced. In each construction, complicated measures such as a graphite high thermal conductivity stamp and press-fitting of a refractory material into a gap between the bottom plate and the like are necessary, and the construction process cannot be simplified.
In particular, the high thermal conductivity stamp is squeezed by human power using a rammer. However, since there is a small gap between the beam and the pipe, it is difficult to achieve high filling and the work load is high.

  In addition, in order to allow the flowable filler to be injected even in a narrow gap, a large amount of liquid is required on the material side, and it is difficult to obtain a construction body with high thermal conductivity, and a high pressure is required on the construction side. Necessary. However, when the press-fitting is increased, the bottom plate or the furnace body may be affected by deformation. Moreover, there is a limit to the reachable distance that can be press-fitted by press-fitting into a narrow gap, and it is necessary to divide into a plurality of sections and repeat press-fitting for a long space portion that crosses the furnace body. 200 single press-fit pipes were installed and constructed. Further, after the construction, the press-fitting single pipes formed on these bottom plates are removed and finished by gas cutting, and further a closing step by welding a sealing iron plate is required.

  The main object of the present invention is to provide a method for constructing a blast furnace bottom that can simplify the filling process and obtain good cooling performance.

  The present invention relates to a method for constructing a blast furnace bottom constructed on a foundation and having a blast furnace body constructed on the upper side, the installation step of installing a beam assembly structure in which a plurality of cooling pipes are arranged, and the beam A closing step of closing a bottom plate on the upper surface of the assembled structure, and a castable is filled from an inlet on a side surface of a space portion in the beam assembled structure closed in the closing step, and the cooling pipe is connected with the castable And a filling step in which the castable is in close contact with the bottom plate.

In the present invention, first, a beam assembly structure in which cooling pipes are arranged is installed (installation process), and the bottom plate is stretched to close the space (close process).
Next, the castable portion is filled into the closed space portion of the beam assembly structure from the inlet on the side surface of the space portion, thereby surrounding the cooling pipe and bringing the castable into close contact with the bottom plate (filling step). At this time, the fluidity of the castable is adjusted so that the filled castable spreads to every corner of the space. Since the space is sufficiently wide, the pressure loss is small, and the castable can be filled with almost no pressure, and the pressure does not affect the bottom plate.

In such this invention, the installation process and the closing process can precede, and the filling process surrounding a cooling pipe can be performed at a stretch. These installation process and closing process were also performed in the conventional procedure (see Patent Document 1). However, regarding the filling of the space portion, in the filling process of the present invention, the process is greatly simplified as compared with the conventional procedure. Can do.
That is, in the conventional procedure, the filling material is filled in two steps, and the filling material is press-fitted into the gap with the bottom plate. However, in the present invention, the step of press-fitting from the bottom plate portion can be omitted.

Furthermore, in the present invention, the castable can be filled into the space at once, and the cooling pipe can be surrounded by the castable, and the castable can be in close contact with the bottom plate, so that the thermal conductivity is ensured and the cooling performance is improved. Can do.
This eliminates the need for press-fitting into a narrow gap as in the prior art, and avoids the high pressure required for press-fitting into a narrow gap.

In the present invention, the injection port arranged on the side surface of the space is used for the castable injection. For this reason, it is not necessary to form the injection port in the bottom plate in the furnace. Therefore, it is not necessary to perform removal processing or closing processing of the inlet when constructing the furnace body, and the construction can be simplified.
When the main beam members are arranged to form a beam assembly structure, the space for accommodating the cooling pipe is a bowl-shaped space sandwiched between the main beam members. In such a configuration, a closing plate may be installed to close the end of the space, and the inlet may be formed in the closing material. Alternatively, other types of injection pipes or the like may be used as long as castable can be injected from the outside into a position corresponding to the side surface of the closing material.

Furthermore, since the space can be filled at once, it is not necessary to repeatedly fill a series of spaces in a plurality of sections, eliminating the need for press-fitting at the intermediate part of the space, and thus closing the opening of the bottom plate. It becomes unnecessary and the complexity of construction is remarkably improved.
In
As the space part, the individual sections forming the space part are arranged so as to cross the furnace body, and the castable injected from the injection port flows from one end side to the other end side of the space part and is filled. It is desirable to have such a configuration.
By doing in this way, it can install so that a space part may lie directly under a furnace body, and injection of castable to a space part can be performed only by the operation from the outside of a furnace bottom.

In the method for constructing a blast furnace furnace bottom according to the present invention, the space portion has a partition plate that is installed at a position corresponding to the outer periphery of the furnace body and partitions the space portion, and the inlet includes the partition plate. It is desirable that an extension pipe extending and communicating with one end side of the space portion is connected.
By doing in this way, castable injection from the side surface can be performed in the spread beam using the main beam material and the cross beam material. Further, by filling the castable portion only in the space portion corresponding to the furnace body, the necessary cooling performance can be efficiently realized with a minimum of materials.

In the blast furnace bottom construction method of the present invention, the space portion may be surrounded by the furnace body, and the inlet may be formed in an iron skin of the furnace body.
By doing in this way, since an injection port does not appear in a bottom plate, it is not necessary to perform removal processing or sealing processing of an injection port in construction of a furnace body, and construction can be simplified. In addition, by installing a cooling pipe only in a portion corresponding to the furnace body in the space portion and filling it with castable, the necessary cooling performance can be efficiently realized with a minimum of materials.

In the method for constructing a blast furnace bottom according to the present invention, in the filling step, it is desirable to use a discharge port that communicates with the other end side of the space portion and is opened to the atmosphere at a position higher than the space portion.
As the discharge port, the same configuration as the above-described injection port can be adopted, for example, formed in the partition plate and communicated with the space portion, formed in the closing plate formed in the upper part of the cross beam material and extending to the partition plate Those communicating with the space through an extension pipe can be used.
In this way, when the castable is injected into one end of the space, it is possible to discharge the air in the space from the discharge port and confirm that a part of the castable is discharged from the discharge port. By doing so, it can be determined that the castable is filled from one end side to the other end side of the space portion.

  In the blast furnace bottom construction method of the present invention, after the filling step, the inlet and outlet may be closed by a valve or a cap.

The top view which shows the blast furnace bottom of 1st Embodiment of this invention. The longitudinal cross-sectional view of the main beam material crossing direction which shows the blast furnace bottom of the said 1st Embodiment. The longitudinal cross-sectional view of the main beam material direction which shows the injection hole periphery of the said 1st Embodiment. The top view which shows the injection inlet periphery of the said 1st Embodiment. The longitudinal cross-sectional view of the main beam material direction which shows the discharge port periphery of the said 1st Embodiment. The top view which shows the discharge port periphery of the said 1st Embodiment. The longitudinal cross-sectional view by the side of the injection port which shows the initial state of the filler injection | pouring of the said 1st Embodiment. The longitudinal cross-sectional view by the side of the injection port which shows the intermediate state of the filler injection | pouring of the said 1st Embodiment. The longitudinal cross-sectional view by the side of the discharge port which shows the intermediate state of the filler injection | pouring of the said 1st Embodiment. The longitudinal cross-sectional view by the side of the discharge port which shows the completion state of the filler injection | pouring of the said 1st Embodiment. The longitudinal cross-sectional view of the main beam material direction which shows the injection port periphery of 2nd Embodiment of this invention. The longitudinal cross-sectional view of the main beam material direction which shows the discharge port periphery of the said 2nd Embodiment. The longitudinal cross-sectional view of the main beam material crossing direction which shows the blast furnace furnace bottom of 3rd Embodiment of this invention. The longitudinal cross-sectional view of the main beam material direction which shows the injection port periphery of the said 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 illustrates a planar shape of the beam assembly 11 according to the present embodiment.
The beam assembly 11 has a lattice-like frame in which main beam members 111, auxiliary beam members 115, and cross beam members 110 using long H-shaped steel members are assembled in an orthogonal direction.
The beam assembly 11 according to the present embodiment includes a rectangular main body portion 11A so as to receive a cylindrical furnace bottom mantel 12, and extended portions 11B projecting on both sides thereof.

The beam assembly 11 is constructed on the foundation 5, and the furnace bottom mantel 12 including an iron skin is constructed on the beam assembly 11. The beam assembly 11 and the furnace bottom mantel 12 constitute a furnace bottom block 10 that is the furnace bottom of the blast furnace. In addition, the shape of the beam structure 11 should just receive the furnace bottom mantel 12, and may be circular instead of the rectangle as shown in FIG.
In the beam structure 11, a cooling pipe 16 for cooling the furnace bottom refractory from the bottom is arranged. The cooling pipe 16 is installed in parallel to the main beam 111 in a space portion 20 (an upper space portion 20U described later) formed between the main beams 111.

2 and 3 are enlarged views of the cross-sectional shape of the beam assembly 11 of the present embodiment.
The beam assembly 11 has a plurality of main beam members 111 arranged in parallel, and in the space between the various beam members 111, a plurality of cross beam members 110 in a crossing direction with the main beam members 111 are arranged in the lower stage. A plurality of auxiliary beam members 115 parallel to the main beam member 111 are arranged in parallel in the upper stage. The cross beam member 110 is joined to the adjacent main beam member 111 at both ends to constitute the lower stage of the beam structure 11. The auxiliary beam member 115 is placed on the upper surface of the cross beam member 110 in the cross direction, that is, arranged in parallel with the main beam member 111 and fixed to the cross beam member 110. Closing plates 19 are stretched on both ends of the auxiliary beam member 115 and the main beam member 111. This closing plate 19 is used for sealing an end of a space 20U described later.

In the lower stage of the beam assembly 11, the cross beam members 110 are arranged at regular intervals so as to connect the plurality of main beam members 111, and a bowl-shaped space portion 20 </ b> L is formed.
Heat resistant concrete 18 is filled in the space 20L. The surface of the solidified heat-resistant concrete 18 is formed near the upper surface of the cross beam member 110.

In the upper stage of the beam assembly 11, a bowl-shaped space 20 </ b> U that extends over the entire length of the main beam member 111 is formed between the plurality of main beam members 111. The space portion 20U crosses the main beam member 111 from one end side to the other end side of the beam assembly 11. Both ends of each space portion 20U are sealed with the closing plate 19 described above, and the outflow of the castable 17 described later is stopped.
Two to four cooling pipes 16 are arranged per section in the space 20U.
A steel bottom plate 14 is stretched on the upper surface of the main beam member 111. The bottom plate 14 closes the upper surface of the space portion 20U to form a closed space in which the cooling pipe 16 is accommodated.

The bottom plate 14 constitutes the bottom surface of the furnace bottom mantel 12.
An iron skin 15 constituting the furnace bottom mantel 12 is installed on the bottom plate 14. The furnace bottom mantel 12 is configured by mounting a stave cooler and a refractory brick (both not shown) inside the iron shell 15.

  The heat resistant concrete 18 filled in the space 20L is applied after the beam structure 11 is installed. At this time, since the cooling pipe 16 is already often arranged in the beam assembly 11 at a manufacturing factory or the like, it is necessary to take care so that the heat-resistant concrete 18 does not adhere to the cooling pipe 16 at the time of construction. .

  The space 20U is filled with a fire-resistant castable 17 on the heat-resistant concrete 18 so as to surround the cooling pipe 16.

The castable 17 is injected into the space portion 20U in a fluid state, and is solidified with the passage of a predetermined time. The castable 17 surrounds the cooling pipe 16 and is filled so as to be in close contact with the lower surface of the bottom plate 14.
As the castable 17, it is necessary to have a high thermal conductivity, so that a material mainly composed of SiC is often used.
Such a castable 17 can ensure fluidity when filling the upper space portion 20U, and can have appropriate strength and heat transfer performance when the space portion 20U is filled and solidified. .

In order to fill the space part 20U with the castable 17, the closing plate 19 at both ends of the space part 20U is provided with an inlet 21 and an outlet 22 communicating with the space part 20U.
In FIG. 1, an injection port 21 is formed on one side (upper side in the figure) of the beam assembly 11, and a discharge port 22 is formed on the other side (lower side in the figure).

In the present embodiment, in order to reduce the amount of castable 17 to be used, filling of the castable 17 is limited to a portion having a substantially circular planar shape corresponding to the furnace bottom mantel 12. Therefore, a partition plate 23 that partitions the vicinity of the end of the space 20U is installed inside the space 20U (see FIGS. 3 to 6).
The partition plate 23 is installed below the iron shell 15 of the furnace bottom mantel 12 and directly below or inside the iron shell 15.
The partition plate 23 is provided with a sealing material or the like so that an opening portion through which the cooling pipe 16 is inserted and a gap between the bottom plate 14 do not increase, and is formed so as not to leak inside when the surrounding heat resistant concrete is constructed. .

4 and 5, the injection port 21 is a pipe-like member, and is installed in a state of penetrating the closing plate 19 (closing the end portion of the space portion 20U) on the top of the spread beam 11, and the outside and the space portion 20U. It communicates with the inside.
Between the closing plate 19 in which the injection port 21 is formed and the nearest partition plate 23, an extension pipe 24 using a pipe-like member having the same diameter as the injection port 21 is installed. The extension pipe 24 communicates with the injection port 21 and also penetrates the partition plate 23 and communicates with a space on the opposite side thereof (a region corresponding to the lower surface side of the furnace bottom mantel 12 in the space portion 20U).
Therefore, when the castable 17 is press-fitted into the injection port 21 from the outside, the castable 17 is introduced into the area corresponding to the lower surface side of the furnace bottom mantel 12 in the space portion 20U via the extension pipe 24 (see FIG. 7).

5 and 6, the discharge port 22 is a pipe-like member, which is welded in a state of passing through the upper closing plate 19 (closing the end of the space portion 20 </ b> U) of the beam assembly 11, The portion 20U communicates with the inside.
An extension pipe 25 using a pipe-shaped member having the same diameter as the discharge port 22 is installed between the closing plate 19 in which the discharge port 22 is formed and the nearest partition plate 23. The extension pipe 25 communicates with the discharge port 22 and also penetrates the partition plate 23 and communicates with a space on the opposite side thereof (a region corresponding to the lower surface side of the furnace bottom mantel 12 in the space portion 20U).

In addition, the discharge port 22 is installed at a position higher than the space 20U, specifically, about 200 mm higher than the bottom plate 14 at the opening tip opposite to the side communicating with the space 20U. It is desirable that
Therefore, when the castable 17 is introduced into the space portion 20U from the inlet 21 side, the air existing in advance in the space portion 20U is discharged from the extension pipe 25 and the discharge port 22.
Furthermore, when a sufficient amount of the castable 17 is filled in the space 20U, a part of the castable 17 is guided to the discharge port 22 via the extension pipe 25 and discharged to the outside (see FIG. 11). By confirming this discharge, it can be recognized that a sufficient castable 17 has been introduced into the space 20U.
The diameters of the discharge port 22 and the extension tube 25 may be the same as the diameters of the injection port 21 and the extension tube 24, but may be slightly larger in order to reduce the discharge resistance of the castable 17.

In the present embodiment, the beam assembly 11 in which the cooling pipes 16 are arranged is manufactured in a factory, and is transported and installed on the foundation 5 (installation process). In addition, from the taking-in at the time of conveyance and installation, the beam assembly structure 11 can be divided into 3 parts in the width direction, and after being installed on the foundation 5, it can be integrated by welding.
Next, after constructing the heat-resistant concrete 18 around the lower space and the outer periphery of the partition plate 23, the furnace bottom mantel 12 is installed on the beam assembly 11. In addition, although the above-mentioned heat-resistant concrete 18 was constructed before the furnace bottom mantel 12 was installed, it may be performed after the installation. Next, the bottom plate 14 is installed and welded (closing process), and the furnace bottom block 10 is completed. Subsequently, the castable 17 is filled, thereby surrounding the cooling pipe 16 and bringing the castable 17 into close contact with the bottom plate 14 (filling step).

7 to 10 show the injection procedure of the castable 17 in the present embodiment.
In FIG. 7, the pressure hose of the castable 17 is connected to the inlet 21 of the beam structure 11 and the valve 27 is opened. When the castable 17 is pumped in this state, the castable 17 is introduced from the inlet 21 through the extension pipe 24 to the space 20U (a region corresponding to the lower surface side of the furnace bottom mantel 12 sandwiched between the pair of main beam members 111). .

In FIG. 8, when the casting of the castable 17 is continued, the castable 17 advances from the inlet 21 side (left side in the figure) along the bottom surface of the space 20U and gradually swells upward from the vicinity of the inlet 21. The upper surface is in close contact with the cooling pipe 16 and the lower surface of the bottom plate 14.
In FIG. 9, when the casting of the castable 17 is continued, the castable 17 continues to advance rightward in the figure, and continues to bulge upward at a slightly delayed portion, and surrounds the cooling pipe 16 and the bottom surface of the bottom plate 14. It will be closely attached to.

In FIG. 10, when a sufficient amount of the castable 17 is injected, the castable 17 reaches the partition plate 23 on the discharge port 22 side, and a part thereof is discharged to the outside through the extension pipe 25 and the discharge port 22.
When the castable 17 is discharged in this way, the valve 27 (see FIGS. 7 and 8) is once closed to stop the injection of the castable 17. After that, the level of the castable 17 is confirmed at the opening tip of the discharge port 22, and if the level does not decrease, it can be determined that sufficient castable 17 has been introduced into the space 20U, so the injection of the castable 17 is stopped.

After this, the pressure hose attached to the inlet 21 of the castable 17 is removed and connected to the next row.
This process is repeated to inject castable 17 into all rows. When the castable 17 is solidified after a lapse of a predetermined time, the filling of the beam structure 11 is completed.

  In the present embodiment, the inlet 21, the outlet 22, the extension pipes 24 and 25, etc. may be left in the beam assembly 11 as they are. Since the castable 17 is solidified, there is no particular problem even if the injection port 21 and the discharge port 22 are not blocked.

  In this embodiment, although the material used for the lower space part 20L is described as the heat-resistant concrete 18, heat-resistant castable and ready-mixed concrete may be used depending on the use temperature of the part.

In this embodiment, the following effects can be obtained.
The beam assembly 11 is installed on the foundation 5 by the installation process, the heat-resistant concrete 18 is constructed, the bottom plate 14 is installed by the closing process, the furnace bottom mantel 12 is installed, and then the castable 17 is filled by the filling process. Can be done at once.

In the present embodiment, the space 20U is filled with the castable 17 in a lump, and the cooling pipe 16 is surrounded by the castable 17 and the castable 17 can be in close contact with the bottom plate 14. Therefore, thermal conductivity is ensured. Cooling performance can be enhanced.
This eliminates the need for press-fitting into a narrow gap as in the prior art, and avoids the high pressure required for press-fitting into a narrow gap.

  The space part 20U is communicated with each other and arranged to cross the furnace body 3, and the castable 17 is injected from one end side (the upper side in FIG. 2) of the space part 20U and flows to the other end side (the lower side in FIG. 2). Therefore, the space 20U can be installed directly below the furnace body 3, and the castable 17 can be injected into the space 20U only from the outside of the furnace body 3. Then, it is possible to proceed to the stave attachment work of the next process, and to make the work out of criticality.

  By using the injection port 21 arranged on the side surface of the space portion 20U for the injection of the castable 17, the injection port 21 does not appear on the bottom plate. For this reason, in the conventional procedure of injecting from inside the furnace, after the castable 17 is installed, the castable is hardened, and the operation from the gas cutting of the press-fitting short tube, finishing of the cut portion, and welding of the sealing iron plate is performed. However, in the present invention, all of them are unnecessary and the process can be shortened.

  A partition plate 23 for partitioning the space portion 20U is installed at a position corresponding to the outer periphery of the furnace body 3 (position of the iron shell 15), and the inlet 21 extends to the partition plate 23 and communicates with one end side of the space portion 20U. Since the pipe 24 is connected, in the beam structure 11 using the main beam material 111 and the cross beam material 110, the castable 17 is injected from the side surface described above, and the portion corresponding to the furnace body 3 in the space 20U By filling only the castable 17 with the required cooling performance, the required cooling performance can be efficiently realized with a minimum of materials.

  By installing the discharge port 22 communicated with the other end side of the space portion 20U, the air in the space portion 20U can be discharged from the discharge port when the castable 17 is injected into one end side of the space portion 20U. At the same time, by confirming that a part of the castable 17 is discharged from the discharge port 22, it can be determined that the castable 17 is filled from one end side to the other end side of the space portion 20U.

  Further, since the discharge port 22 is open to the atmosphere at a position higher than the bottom plate, the air in the space portion 20U can be reliably pushed out when the castable 17 is filled, and the castable 17 filled in the space portion 20U. It is possible to prevent a gap from being formed between the top surface and the bottom plate 14.

[Second Embodiment]
11 and 12 show a second embodiment of the present invention.
This embodiment basically has the same configuration as that of the first embodiment described above, and a part of the configuration is different. For this reason, overlapping description is omitted, and only different parts will be described below.
In this embodiment, the partition plate 23 as in the first embodiment is not installed in the space portion 20U, and the castable 17 is filled over the entire space portion 20U.

FIG. 11 shows the peripheral structure of the injection port 21 of the present embodiment. The injection port 21 is a pipe-like member similar to that of the first embodiment. However, there is no extension pipe or the like inside the closing plate 19 just through the closing plate 19, and the space portion 20U is immediately behind the closing plate 19. The castable 17 is filled from the inside.
FIG. 12 shows a peripheral structure of the discharge port 22 of the present embodiment. The discharge port 22 is a pipe-like member similar to that of the first embodiment, but only passes through the closing plate 19 and there is no extension pipe or the like inside the closing plate 19, and the space 20U has a closing plate on the opposite side. The castable 17 is filled up to the inside of 19.

In this embodiment, the castable 17 is filled over the entire space 20U so as to traverse from one end side to the other end side of the planar shape of the beam assembly 11 with the first embodiment. Similar effects can be obtained.
Since the castable 17 is filled over the entire planar shape of the spread beam 11, the amount of the castable 17 used is larger than that of the first embodiment. On the other hand, the partition plate 23, the extension pipe 24, and the like in the first embodiment are used. There is an advantage that the installation of 25 is unnecessary, the structure can be simplified, and the manufacturing period can be shortened.

[Third Embodiment]
13 and 14 show a third embodiment of the present invention.
This embodiment basically has the same configuration as that of the first embodiment described above, and a part of the configuration is different. For this reason, overlapping description is omitted, and only different parts will be described below.
In the present embodiment, the space portion 20 does not have the upper and lower steps as in the first embodiment, the lower cross beam member 110 in the first embodiment is omitted, and the partition plate 23 is installed in the space portion 20. It has not been. Further, the core 15 of the furnace bottom mantel 12 is extended downward, and the main beam 111, the bottom plate 14, and the cooling pipe 16 of the laying beam 11 are surrounded by the core 15.

  The inlet 21 or the outlet 22 on the opposite side of the present embodiment is formed in the iron shell 15 and communicates with the space 20. The castable 17 is injected into the space 20 through these injection ports 21, and excess air or a part of the castable 17 is discharged from the discharge port 22 on the opposite side.

  Also by this embodiment, the same effect as the first embodiment can be obtained. Further, by using the iron skin 15 around the beam assembly 11, the structure of the beam assembly 11 is restricted, or the furnace bottom block 10 is manufactured at another work site and transferred onto the foundation 5. However, by limiting the main beam material 111 or the castable 17 to the size of the furnace bottom mantel 12, the amount of material used can be reduced.

  The present invention relates to a method for constructing a blast furnace bottom, and can be used for constructing a bottom part of a blast furnace.

DESCRIPTION OF SYMBOLS 1 ... Blast furnace 3 ... Furnace body 4 ... Ring block 5 ... Base 10 ... Furnace bottom block which is a furnace bottom part 11 ... Beam assembly 12 ... Furnace bottom mantel 14 ... Bottom plate 15 ... Iron skin 16 ... Cooling pipe 17 ... Castable 18 ... Heat-resistant concrete 19 ... Closure plate 20 ... Space 20U ... Upper space 20L ... Lower space 21 ... Inlet 22 ... Discharge port 23 ... Partition plate 24 ... Inlet extension tube 25 ... Discharge port extension tube 27 ... Valve 110 ... Intersecting beam material 111 ... Main beam material

Claims (4)

A method for constructing a blast furnace bottom constructed on a foundation and having a blast furnace body on the upper side,
An installation process for installing a beam assembly in which a plurality of cooling pipes are arranged;
A closing step of closing and closing a bottom plate on the upper surface of the beam structure;
Filling the castable from the inlet of the side surface of the space in the beam assembly structure closed in the closing step, surrounding the cooling pipe with the castable, and filling the castable to the bottom plate; and A method of constructing a blast furnace bottom, characterized by comprising: In the construction method of the blast furnace bottom described in claim 1,
The space portion has a partition plate that is installed at a position corresponding to the outer periphery of the furnace body and partitions the space portion,
A method for constructing a blast furnace bottom, wherein an extension pipe extending to the partition plate and communicating with one end side of the space portion is connected to the inlet. In the construction method of the blast furnace bottom described in claim 1,
The space is surrounded by the iron shell of the furnace body,
The method for constructing a blast furnace bottom, wherein the inlet is formed in the iron skin. In the method for constructing a blast furnace bottom according to any one of claims 1 to 3,
In the filling step, a method for constructing a blast furnace bottom, wherein an exhaust port that is communicated with the other end side of the space portion and opened to the atmosphere at a position higher than the space portion is used.

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