JP4220926B2 - Blast furnace repair method - Google Patents

Description

  The present invention relates to a method for repairing a blast furnace, and more particularly to a method for repairing the bottom of a blast furnace body.

  Conventionally, blast furnace refurbishment requires a long period of 4 to 5 months, including the dismantling of the furnace body, the construction of the refractory in the furnace, and the installation of the cooling system. From this point of view, it has been strongly demanded to renovate the blast furnace in the shortest time.

  In addition, the number of operating blast furnaces is on the decline, and there are many steelworks operating single-unit blast furnaces, and there is a strong demand for renovation in the short term. Among them, various repair methods, dismantling / removal methods, and installation methods have been proposed for the repair method of the furnace bottom.

  For example, in Japanese Patent Laid-Open No. 5-222420, a fluid film of compressed gas is formed between a furnace bottom and a blast furnace base, and the furnace bottom is held horizontally by a hydraulic jack through the fluid film. A blast furnace refurbishing method has been proposed in which the moving resistance is reduced and the bottom of the furnace is separated and removed.

  In addition, JP-A-2001-59109, JP-A-2001-81508, JP-A-2001-131617, JP-A-2001-207204, etc. have a plurality of through holes in the blast furnace foundation concrete directly under the furnace bottom. After the dawn, a proposal has been made to use a through hole to separate the furnace bottom from the blast furnace foundation concrete with a wire saw, etc., and to install a mechanism for floating the furnace bottom in the horizontal through hole to enable horizontal drawing.

  Also, in JP 2002-339007 A, a horizontal through hole is made in a blast furnace foundation concrete, and after horizontal cutting with a wire saw, a gap is formed by lifting the furnace bottom through this cut surface, and using this gap The horizontal movement means is arranged, and the bottom of the furnace is thereby moved laterally at a time. In order to make the movement successful, it is necessary to securely arrange the horizontal movement means in the gap. It is necessary to secure a horizontal cut surface cut by a saw.

  The technology disclosed in Japanese Patent Laid-Open No. 2002-339007 will be briefly described with reference to FIGS. The blast furnace 10 includes a blast furnace foundation concrete 11, a spread beam 12 provided on the foundation 11, and a blast furnace main body 13 provided on the spread beam 12. The blast furnace 10 and the furnace top equipment provided at the upper part thereof are supported by a furnace body rod 14 including struts 22 erected at four locations around the blast furnace, and a center hole jack 50 on which the blast furnace body 13 is suspended. Install suspension means such as.

  The laying beam 12 provided on the blast furnace foundation concrete 11 includes a large number of H-shaped steels arranged in parallel, cooling pipes installed between the H-shaped steels, and a flat or circular shape installed on the top of the H-shaped steel. It consists of the bottom plate of the furnace. The upper side of the laying beam 12 that reaches a high temperature is cooled by the cooling pipe or the like, and the temperature rise of the blast furnace foundation concrete 11 below the laying beam 12 is restricted.

  The blast furnace body 13 is formed in a cylindrical shape and is erected and welded to the upper part of the furnace bottom plate. The outer side of the blast furnace body 13 is covered with an iron skin 29, and a number of stave coolers 30 are arranged on the inner side. A furnace bottom brick layer 31 made of a refractory is formed on the inner lower portion of the blast furnace body 13. After the blast furnace 10 is blown up, the cooled and solidified residue remains on the top of the furnace bottom brick layer 31.

  The procedure of the dismantling method for the blast furnace bottom 36 will be described with reference to FIG. In the cutting process of the blast furnace bottom part 36, a horizontal cutting part 49 divided in advance into cutting sections 37, 38, 39 and 40 is planned in the blast furnace basic concrete 11 below the floor beam 12 cut from the blast furnace main body 13. As shown in FIG. 10B, the cutting sections 37 to 40 are formed in a sector shape having a central angle of 90 degrees that is point-symmetric and line-symmetric with respect to the center of the blast furnace body 13. The cutting section is not limited to such a sector shape, but can be a rectangular section sliced horizontally.

  The boundaries 41, 42, 43, 44 of each cutting section 37-40 are separated by core boring performed from the side using a drilling machine (not shown), and adjacent boundaries 41, 42, and boundary 43, which are perforated. , 44 are respectively inserted with wire saws 45, 46, and by operating them simultaneously, the opposing cutting sections 37, 39 can be cut simultaneously so that the blast furnace body 13 maintains a standing state at a right angle. it can. Next, a flexible hose is inserted into the cut portion, a liquid release material is applied to the upper and lower cut surfaces, and then the cut surface grout material is filled and the load of the blast furnace body is supported by the hardened grout material. .

  By repeatedly performing the series of operations, the step of separating the bottom of the furnace can be performed even during operation of the blast furnace 10.

  In the furnace body cutting step, after cutting the horizontal cutting part 49, the blast furnace 10 is blown up, the brackets 52, 53 are welded to the upper part and the lower part of the blast furnace main body 13, and the center hole jacks 50, 51 are attached. The upper mantel 34 and the blast furnace bottom 36 including the floor beam 12 and the furnace bottom mantel 35 are supported. Next, by horizontally cutting the lower portion 15 from the tuyere level of the blast furnace main body 13, the blast furnace main body 13 is separated into an upper mantel 34 and a furnace bottom mantel 35 containing a residual brick and residue 33. At the same time, the surrounding facilities are dismantled.

  In the removal process of the blast furnace bottom 36, the blast furnace bottom 36 is raised using the center hole jack 51 in a state where the upper mantel 34 is lifted using the center hole jack 50. The blast furnace bottom portion 36 can be lifted away from the lower portion of the blast furnace foundation concrete 11 with a small force by the action of the release material applied with the horizontal cutting portion 49. Alternatively, it is possible to raise the furnace bottom with a hydraulic jack.

Next, a carriage 58 that can travel on the rail member 55 constituting the lateral movement means is disposed on the cut surface of the blast furnace bottom 36, the blast furnace bottom 36 is lowered onto the carriage 58, and is moved laterally using a winch or the like (not shown). Then, it is moved out of the furnace body 14 and further transported by the heavy material transport cart 57.
JP-A-5-222420 JP 2001-59109 A JP 2001-81508 A JP 2001-131617 A JP 2001-207204 A JP 2002-339007 A

  According to conventional techniques such as Japanese Patent Application Laid-Open No. 2002-339007, the blast furnace main body is separated into an upper mantel and a blast furnace bottom including a floor beam and a furnace bottom mantel, and the blast furnace foundation concrete below the blast furnace bottom is horizontally oriented using a wire saw. After the blast furnace bottom is lifted, the bottom of the blast furnace is lifted to form a gap in the cut, and the lateral movement means is arranged using this gap to move the bottom of the blast furnace in a lump to repair the blast furnace body. There is an advantage that can be done in a short period of time, but in order for the movement to be successful, it is necessary to secure a cutting plane in order to securely arrange the lateral movement means in the gap, and in this respect the blast furnace bottom is raised In this case, there is a problem that the concrete deteriorated by high heat may be peeled off in the gaps and hinder the cutting plane.

  The present invention is to solve the above-mentioned problems, and will be further described with reference to FIGS. Each figure shows a blast furnace base for carrying out the repair method of the present invention. In FIG. 2, a bottom step beam 63 made of H-shaped steel is installed in a recess 62 formed on the upper surface of the blast furnace foundation concrete 61, and a grout 64 is formed in the recess 62 so as to fill a gap between the bottom step beam 63. Filled. A first stage beam 65 is disposed above the lowermost stage beam 63, a second stage beam 68 is disposed on the first stage beam 65, and a furnace bottom plate 69 is disposed on the second stage beam 68. A furnace bottom brick 70 including the residue is installed through the furnace, and a furnace bottom mantel 71 is installed. The first stage beam 65, the second stage beam 68, and the furnace bottom mantel 71 are referred to as a blast furnace bottom 66. Depending on the blast furnace, there is a blast furnace in which the second stage beam 68 is omitted, but in this case, the same method can be applied.

  When constructing the blast furnace bottom 66, first, a lowermost floor beam 63 is first installed in a recess 62 formed on the upper surface of the blast furnace foundation concrete 61, as shown in FIG. 1. The concrete raised in a convex shape between the recesses 62 is referred to as the uppermost foundation concrete layer 61a. The reason why the lowermost floor beam 63 is installed in the concave portion 62 instead of a plane is to ensure the connection between the lowermost floor beam 63 and the blast furnace foundation concrete 61. After the lowermost floor beam 63 is installed in the concave portion 62, the grout 64 is filled in the concave portion 62 so as to fill the gap between the lowermost floor beam 63. Thereafter, the first stage beam 65, the second stage beam 68, the furnace bottom mantel 71, the furnace bottom brick 70, and the like are sequentially installed on the lowermost stage beam 63.

  The base of the blast furnace, which is the object of implementation of the repair method of the present invention, has the above-described configuration. When dismantling the blast furnace bottom 66 for repair of the blast furnace main body, the cutting level 72 is positioned below the bottom beam 63. A plurality of through holes are opened, a wire saw is passed through the through holes, and the base concrete 61 and the blast furnace bottom 66 are separated vertically by using the same method as before. Thereafter, the temporary bracket 73 is newly installed to directly support the first stage beam 65, and the blast furnace bottom 66 and the blast furnace foundation concrete 61 are lifted through the temporary bracket 73 using the temporary hydraulic jack 74. A gap 75 in which a lateral moving means such as a roller can be inserted is formed between the upper surface of the cut surface. After that, the support of the blast furnace bottom 66 is transferred from the temporary hydraulic jack 74 to the lateral movement means and moved out of the furnace body rod.

  Normally, the upper surface of the blast furnace foundation concrete 61 is cooled when the blast furnace is in operation, but is exposed to high temperatures, the strength of the concrete is reduced, and cracks are generated or powdered. It is fragile. Therefore, as shown in FIG. 3, the first stage beam 65 in the blast furnace bottom 66 located above the horizontally cut level 72 is directly supported by the temporary bracket 73 together with the lowermost stage beam 63 and temporarily installed. When the hydraulic jack 74 is lifted away from the blast furnace foundation concrete 61, the uppermost foundation concrete layer 61a filled between the lowermost floor beams 63 and raised to the same level as the grout 64 is lifted together. .

  The boundary surface 76 between the uppermost foundation concrete layer 61a and the grout 64 is not connected by a reinforcing bar or the like, and the uppermost foundation concrete layer 61a becomes brittle due to the heat of the blast furnace, and becomes a small piece 61b or is pulverized and peeled off. There is a danger, and these may fill the gaps 75 located below to hinder the smoothness of the cut surface, and may make it impossible to arrange the moving equipment for the blast furnace bottom 66. For this reason, the conventional method has been difficult to apply in practice.

The present invention proposes a blast furnace refurbishing method that solves the above-mentioned problems. That is, according to the present invention, when the bottom of the blast furnace is lifted away from the blast furnace foundation concrete, the uppermost foundation concrete layer that has become brittle due to the heat of the blast furnace is prevented from peeling off, and the concrete pieces 61b and the like may fall into the lower gap 75. Is to eliminate.

  In order to solve the above problems, the present invention is configured as follows.

In the first invention, a floor beam is installed in a recess formed in the uppermost concrete layer of the blast furnace foundation concrete and filled with grout, and a blast furnace bottom portion including the floor beam is formed on the top, and the blast furnace In separating the blast furnace bottom from the basic concrete, separating the furnace bottom mantel and the upper mantel, lifting the blast furnace bottom and moving it laterally from the installation location,
As a reinforcement work for thermal deterioration of the uppermost foundation concrete layer, a plurality of first through holes are drilled horizontally through the laying beam in the orthogonal direction, and further through the uppermost concrete layer and grout. After reinforcing the rod-like member such as a reinforcing bar in the interior, the grout is filled, and a plurality of second through holes are opened horizontally in the blast furnace foundation concrete below the first through hole and directly below the bottom of the furnace, The blast furnace foundation concrete is cut horizontally at the position of the second through hole, the blast furnace bottom and the blast furnace foundation concrete are separated, and the blast furnace bottom is raised by an appropriate lifting means, so that there is a gap between the blast furnace bottom and the blast furnace foundation concrete. And a moving means such as a roller is installed in the gap to move the bottom of the blast furnace.

According to a second aspect of the present invention, a floor beam is installed in a recess formed in the uppermost concrete layer of the blast furnace foundation concrete and filled with a grout, and a blast furnace bottom portion including the floor beam is formed on the top thereof. In separating the blast furnace bottom from the basic concrete, separating the furnace bottom mantel and the upper mantel, lifting the blast furnace bottom and moving it laterally from the installation location,
A plurality of second through holes are drilled horizontally in the blast furnace foundation concrete directly below the bottom of the furnace, the blast furnace foundation concrete is cut horizontally at the position of the second through hole, and the blast furnace bottom and the blast furnace foundation concrete are separated. As reinforcement work for thermal deterioration of the upper foundation concrete layer, the first beam is penetrated in the orthogonal direction, and a plurality of first through holes are opened horizontally through the uppermost concrete layer and the grout. After installing a bar-shaped member such as a reinforcing bar, it is reinforced by filling the grout, and by raising the blast furnace bottom with an appropriate lifting means, a gap is formed between the blast furnace bottom and the blast furnace foundation concrete. The moving means is installed, and the bottom of the blast furnace is moved.

  According to a third invention, in the first or second invention, the rod-shaped member is put around the rod-shaped member such as a reinforcing bar, and the rod-shaped member is inserted into the first through hole, and thereafter, the rod-shaped member is inserted into the fiber-shaped bag. It is characterized by filling with grout.

  According to a fourth invention, in any one of the first to third inventions, the lifting means for the bottom portion of the blast furnace is constituted by a jack.

  According to the blast furnace refurbishing method of the present invention, before or after separating the blast furnace bottom and the blast furnace foundation concrete, a horizontal first through hole is formed in the uppermost foundation concrete layer, and a reinforcing bar or a bar-like member is used instead of the first through hole. When the grout is inserted and the grout is filled, the grout is also filled with cracks in the surrounding concrete, so that it becomes a block and the uppermost foundation concrete layer is integrated with the rod-like member and separated from each other for the cutting. It is possible to reinforce the uppermost foundation concrete layer that is brittle and can be peeled off. Therefore, the uppermost foundation concrete layer is surely lifted up integrally with the bottom of the blast furnace, the falling of the concrete pieces into the gap can be eliminated, the cut surface can be smoothed, and the moving means can be smoothly arranged in the gap. As a result, it is possible to carry out the batch removal from the installation position of the blast furnace bottom, and the repair work of the blast furnace bottom can be performed smoothly and quickly.

  An embodiment of the present invention will be described with reference to FIGS. Since FIGS. 1 to 3 have been described in [18] to [22], this will be used and will be described mainly with reference to FIG.

  In the present invention, as shown in FIG. 4, the foundation concrete 61 is horizontally cut at a cutting level 72 positioned below the lowermost floor beam 63, and a first stage beam 65 positioned above the cutting level 72 is provided. The blast furnace bottom 66 including the first stage beam 65, the second stage beam 68, and the furnace bottom mantel 71 is separated from the blast furnace foundation concrete 61 by a temporary hydraulic jack 74 that is directly supported by a new temporary bracket 73. Although it raises, before making it rise, as reinforcement work for preventing exfoliation of the uppermost foundation concrete layer 61a which lifts together with the blast furnace bottom 66, it is orthogonal to the extension direction of the bottom step beam 63 made of H-section steel A first through-hole 77 is opened in a direction by a core boring machine (not shown), and a rod-like member 78 such as a reinforcing bar is inserted into the first through-hole 77 and a grout 80 is filled. . Thereafter, the first stage beam 65 is directly supported by the temporary bracket 73 and is lifted away from the blast furnace foundation concrete 61 by the temporary hydraulic jack 74.

  The first through-hole 77 penetrating in the direction orthogonal to the lowermost floor beam 63 penetrates through the web 63a of the lowermost floor beam 63 and also through the grout 64 and the uppermost foundation concrete layer 61a as shown in the figure. It is done.

  When carrying out the repair method of the present invention, there are two methods with different processes. In the first construction method, the first through hole 77 is opened as a reinforcement work for thermal deterioration of the uppermost foundation concrete layer 61 a of the blast furnace foundation concrete 61, and a rod-shaped member 78 such as a reinforcing bar is installed in the first through hole 77. After that, reinforcement for filling the grout 80 is performed. Thereafter, a plurality of second through holes 79 (positions at the cutting level 72 in FIGS. 3 and 4) for inserting a wire saw are opened in the blast furnace foundation concrete 61 immediately below the first through hole 77 in the horizontal direction, and a plurality of adjacent through holes 79 are adjacent to each other. A wire saw is inserted into the second through hole 79, the blast furnace foundation concrete 61 is horizontally cut at the position of the second through hole 79, the blast furnace bottom 66 and the blast furnace foundation concrete 61 are separated at a cutting level 72, and the blast furnace bottom 66 is raised by a temporary hydraulic jack 74 or the like to form a gap 75 between the blast furnace bottom portion 66 and the blast furnace foundation concrete 61, and a moving means facility (not shown) such as a roller is installed there. Move horizontally.

  In the second method, a plurality of second through holes 79 for inserting a wire saw are opened in the blast furnace foundation concrete 61 immediately below the blast furnace bottom 66 in the horizontal direction, and a wire saw is inserted into a plurality of adjacent second through holes 79. The blast furnace foundation concrete 61 is horizontally cut at the position of the second through hole 79, and the blast furnace bottom 66 and the blast furnace foundation concrete 61 are separated at a cutting level 72. Next, after the first through hole 77 is opened and a rod-shaped member 78 such as a reinforcing bar is installed in the first through hole 77, reinforcement for filling the grout 80 is performed. Next, by raising the blast furnace bottom 66 with a temporary hydraulic jack 74 or the like, a gap 75 is formed between the blast furnace bottom 66 and the blast furnace foundation concrete 61, and a moving means (not shown) such as a roller is installed there. Then, the blast furnace bottom 66 is moved laterally.

  When the first and second methods are performed, the grout 80 is filled in the first through hole 77 for the following reason. As the first through hole 77 passes through the uppermost foundation concrete layer 61a and the rod-shaped member 78 such as a reinforcing bar is inserted, the concrete layer 61a becomes brittle due to the heat of the blast furnace. There are a plurality of cracks (cracks) 81, and the concrete layer 61 a is crushed and falls through the cracks 81. The cracks 81 communicate with the first through holes 77 by opening the first through holes 77. Therefore, by filling the first through-hole 77 with the grout 80, the grout 80 is filled into the gap between the first through-hole 77 and the crack 81, and the concrete layer 61a and the grout 80 are integrated into a block, which is brittle. This eliminates the possibility of becoming a small piece of concrete fragments and can stably support the entire blast furnace bottom 66 with a rod-shaped member 78 such as a reinforcing bar.

  Further, a fibrous bag body 82 in which an aramid fiber or the like is formed in a cylindrical shape is covered around the rod-shaped member 78, and the rod-shaped member 78 is simultaneously inserted into the first through hole 77, and then the grout 80 is placed in the fibrous bag body 82. You may comprise so that it may be filled. The use of the fibrous bag 82 is suitable for the second construction method. That is, the grout 80 filled in the fibrous bag body 82 is appropriately controlled to flow out to the outside by the mesh of the fibrous bag body 82, and is opened before the first through hole 77 in the second construction method. For example, when the crack 81 is in communication with the second through-hole 79, the grout 80 can be prevented from leaking into the second through-hole 79 through the crack 81.

  FIG. 7 is a diagram showing a concrete structure of the blast furnace base portion for carrying out the renovation method of the present invention, and FIG. 8 is a partially enlarged view of FIG. 7, with elements equivalent to the explanatory diagrams of FIGS. Are denoted by the same reference numerals and description thereof is omitted. 7 and 8, a cooling pipe 83 disposed in parallel with each beam in a gap between a plurality of H-shaped steel first stage beams 65 and second stage beams 68 arranged in parallel. Is shown.

  As explained above, by implementing the method of the present invention, the upper and lower surfaces of the cut surface of the uppermost foundation concrete layer 61a are reinforced by reinforcing the thermally deteriorated uppermost foundation concrete layer 61a and preventing the concrete pieces from falling. Smoothing can be ensured, the moving means can be smoothly arranged in the gap 75 formed in the cut surface material, and the blast furnace bottom 66 can be carried out collectively through the moving means, and the blast furnace base part Can be done smoothly and quickly.

The blast furnace base part which implements the repair method of the present invention is shown, and the construction of the blast furnace bottom part in which the bottom stage laying beam, the first stage laying beam, the second stage laying beam, and the furnace bottom mantel are constructed in this order on the blast furnace foundation concrete It is sectional explanatory drawing in the middle. It is sectional explanatory drawing of the construction completion state of a blast furnace bottom part. It is sectional explanatory drawing which shows the state of the dismantling construction of the conventional blast furnace bottom part as a comparative example. It is sectional explanatory drawing which shows the state of the dismantling construction of the blast furnace bottom part which concerns on embodiment of this invention. (A), (b) is a partial conventional cross-sectional view and a transverse cross section showing a penetration state of a rod-shaped member such as a first through hole penetrating the lowermost stage laying beam, the uppermost foundation concrete layer, and the grout, and a reinforcing bar inserted therethrough. FIGS. 5C and 5D are enlarged views showing two examples of part A in FIG. It is a BB arrow line view of Drawing 4, and is a figure showing the arrangement mode of the lowest stage laying beam. It is sectional drawing which shows the specific example of the blast furnace base part which implements the repair construction method of this invention. FIG. 8 is an enlarged partial view showing the right half of FIG. 7. It is a front sectional view of a blast furnace body showing a conventional blast furnace bottom repair method. (A) is partial explanatory drawing which shows the dismantling of the blast furnace bottom part of FIG. 9, (b) is a plane explanatory drawing which shows the cutting | disconnection aspect of foundation concrete.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Blast furnace 11 Blast furnace foundation concrete 12 Laying beam 13 Blast furnace main body 14 Furnace ridge 15 Lower part
22 pillar 23 H-shaped steel 24 cooling pipe 25 grout material 26 furnace bottom plate 28 stamp material 29 iron skin 30 stave cooler 31 furnace bottom brick layer 33 residue 34 upper mantel 35 bottom mantel 36 blast furnace bottom 37-40 cutting sections 41-44 Boundary 45, 46 Wire saw
47, 48 Cutting surface 49 Horizontal cutting part 50, 51 Center hole jack
52, 53 Suspension bracket 54 Barbed floor 55 Rail member 56 Grout material 57 Heavy material transporting carriage 58 Carriage 61 Blast furnace foundation concrete 61a Uppermost foundation concrete layer 62 Recess 63 Lowermost laying beam 64 Grout 65 First stage beam 66 Blast furnace bottom 68 Second stage beam 69 Furnace bottom plate 70 Furnace bottom brick 71 Furnace bottom mantel 72 Cutting level 73 Temporary bracket 74 Temporary hydraulic jack 75 Clearance
76 Boundary surface 77 First through hole 78 Bar-like member such as reinforcing bar 79 Second through hole 80 Grout 81 Crack 82 Fiber bag 83 Cooling pipe

Claims (4)

A floor beam is installed in a recess formed in the uppermost concrete layer of the blast furnace foundation concrete and filled with grout, and a blast furnace bottom portion including the floor beam is formed on the top, and the blast furnace bottom portion is formed from the blast furnace foundation concrete. In the refurbishment method of the blast furnace where the bottom mantle and the upper mantel are separated and the blast furnace bottom is lifted and moved laterally from the installation location,
As reinforcement work for thermal deterioration of the uppermost blast furnace foundation concrete layer, the first beam is penetrated in the orthogonal direction, and a plurality of first through holes are drilled horizontally through the uppermost concrete layer and the grout. After reinforcing rod-like members such as reinforcing bars in the inside, the grout is filled and the second through-holes are opened horizontally in the blast furnace foundation concrete below the first through-holes and directly below the bottom of the furnace, The blast furnace foundation concrete is horizontally cut at the position of the second through hole, the blast furnace bottom portion and the blast furnace foundation concrete are separated, and the blast furnace bottom portion is raised by an appropriate lifting means, so that the blast furnace bottom portion and the blast furnace foundation concrete are separated from each other. A blast furnace refurbishing method characterized in that a gap is formed, a moving means such as a roller is installed in the gap, and the bottom of the blast furnace is moved. A floor beam is installed in a recess formed in the uppermost concrete layer of the blast furnace foundation concrete and filled with grout, and a blast furnace bottom portion including the floor beam is formed on the top, and the blast furnace bottom portion is formed from the blast furnace foundation concrete. In the refurbishment method of the blast furnace where the bottom mantle and the upper mantel are separated and the blast furnace bottom is lifted and moved laterally from the installation location,
A plurality of second through holes are drilled horizontally in the blast furnace foundation concrete directly below the bottom of the furnace, the blast furnace foundation concrete is cut horizontally at the position of the second through hole, and the blast furnace bottom and the blast furnace foundation concrete are separated. As reinforcement work for thermal deterioration of the upper foundation concrete layer, the first beam is penetrated in the orthogonal direction, and a plurality of first through holes are opened horizontally through the uppermost concrete layer and the grout. After installing a bar-shaped member such as a reinforcing bar, it is reinforced by filling the grout, and by raising the blast furnace bottom with an appropriate lifting means, a gap is formed between the blast furnace bottom and the blast furnace foundation concrete. A blast furnace refurbishment method, characterized in that the moving means is installed and the bottom of the blast furnace is moved.   3. The fiber bag according to claim 1, wherein a fiber bag is placed around a bar member such as a reinforcing bar, the rod member is inserted into the first through hole, and then the fiber bag is filled with grout. The blast furnace renovation method.   The blast furnace refurbishing method according to any one of claims 1 to 3, wherein the lifting means at the bottom of the blast furnace is constituted by a jack.

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