WO2007135916A1

WO2007135916A1 - Dismantling method of bottom section of blast furnace

Info

Publication number: WO2007135916A1
Application number: PCT/JP2007/060043
Authority: WO
Inventors: Hiroshi Takasaki; Takashi Hamada; Yuuzi Sudou
Original assignee: Nippon Steel Engineering Co., Ltd.
Priority date: 2006-05-18
Filing date: 2007-05-16
Publication date: 2007-11-29
Also published as: CN101448961B; JPWO2007135916A1; CN101448961A; BRPI0711009B8; BRPI0711009A2; BRPI0711009B1; KR20090007752A; BRPI0711009A8; JP4300249B2; KR101322251B1

Abstract

The dismantling method comprises steps 1-8. Step 1: a plurality of cutting sections are set in the direction parallel with the drawing direction on a horizontal cutting plane set in the foundation concrete at the bottom of a blast furnace. Step 2: a horizontal hole is bored in parallel with the drawing direction in the foundation concrete on the boundary of the cutting sections. Step 3: the foundation concrete in the cutting section is cut along the upper and lower horizontal planes by inserting a wire into adjoining horizontal holes. Step 4: an air gap portion is formed by discharging the foundation concrete between the upper and lower horizontal cutting planes. Step 5: a lateral movement member for carrying out the furnace bottom section is arranged in the air gap portion. Step 6: a furnace body load supporting member is provided in the gap between the upper surface of the lateral movement member and the upper horizontal cutting plane. Step 7: a lateral movement means equipped with the lateral movement member and the furnace body load supporting member is arranged over the entire region of a horizontal cutting portion by repeating the steps 2-6 or steps 3-6. Step 8: an upper mantel is separated from the furnace bottom, hoisted and carried out by imparting a horizontal force.

Description

Specification

Method of dismantling the bottom of the blast furnace furnace

Technical field

TECHNICAL FIELD [0001] The present invention relates to a method for dismantling a blast furnace bottom for dismantling the bottom of a furnace in a short time in blast furnace renovation.

Background art

Conventionally, when a blast furnace bottom is dismantled and transported out of the system for blast furnace refurbishment, hot metal, slag, etc. staying at the bottom of the blast furnace furnace is discharged as much as possible to dismantle the power. In this kind of dismantling work, several methods for shortening the dismantling period have been proposed so far (see, for example, Patent Documents 1 and 2).

[0003] In Patent Document 1, after blowing a blast furnace, the solidified body layer and the bottom brick layer remaining on the bottom of the furnace are taken out of the furnace and removed. After cutting horizontally at a higher position, the furnace body above the cutting position is suspended from the blast furnace furnace shell with jack etc. and fixed, and then the furnace body skin below the cutting position is fixed to the furnace body. A method of dismantling the bottom of the blast furnace is disclosed, which is removed over the entire circumference, and the solidified layer and the bottom brick are drawn out of the furnace together.

[0004] According to this dismantling method, the dismantling period can be shortened compared to the conventional method in which residues and carbon bricks are divided by blasting and carried out of the furnace. A temporary opening was provided at the bottom of the previous blast furnace furnace, and hot metal and slag staying in the hearth were discharged from the opening, and then water and water were injected from the top of the furnace to cool the residue and furnace. Since this is a dismantling method that will be implemented later, the entire dismantling period is not necessarily large, because the amount of work to disassemble the iron shell dismantling around the entire furnace body, the solidified material layer in the furnace, and the brick at the bottom of the furnace is extremely large. Not shortened.

[0005] Further, in the above dismantling method, the iron core at the bottom of the blast furnace furnace (furnace iron core below the cutting position of the furnace body) and the furnace bottom plate are cut and separated. Therefore, it cannot be supported by being lifted up or pushed up with a jack. Therefore, it is not possible to place a pull-out rail, roller member, etc. of There is a problem that the drawing work becomes unstable.

[0006] Based on the above-mentioned problems, the applicant of the present invention disclosed in Patent Document 2 that a plurality of cuts were made in advance on the foundation concrete below the floor beam provided at the lower part of the blast furnace body during the operation before the blast furnace blowing. Set the horizontal cutting section divided into cutting sections, keep the blast furnace main body in an upright state, cut each cutting section with wire saw, and (i) peelability in the section cut with wire saw Securing and filling the grout material, while supporting the load of the blast furnace body with the hardened grout material, or (ii) Filling with sand or iron particles and supporting the load of the blast furnace body, horizontal cutting We proposed a method of dismantling the bottom of the blast furnace, which is characterized by sequentially cutting the section with a wire saw.

[0007] According to this dismantling method, the bottom beam of the blast furnace, which is integrally coupled with the bottom beam and the mantle force of the furnace bottom, is lifted with a jack, etc., separated from the basic concrete, and the lateral movement means is arranged in the separation space. Then, the bottom of the blast furnace furnace is loaded on the lateral movement means, and then moved laterally and carried out. Therefore, regardless of the solidification state and amount of the residue solidified inside the bottom of the blast furnace, the bottom of the blast furnace can be disassembled and transported with a unified work procedure while containing the solidified residue. The dismantling period can be greatly shortened.

[0008] In the dismantling method, a rail member, a carriage, a roller, a pneumatic levitation device, or the like is disclosed as a lateral movement means for carrying out the bottom of the blast furnace furnace. In order to place it in the separation space, it is necessary to secure a separation space that is as high as “stagnation of the blast furnace furnace body + height of the lateral movement means + surplus leeway (working space for the lateral movement means, etc.)” is there.

[0009] That is, the dismantling method described above includes jack-up work for the bottom of the furnace necessary to secure a separation space in consideration of the above-mentioned "stagnation of the blast furnace furnace body", bracket mounting work for jack-up, etc. As the workload increases, there are challenges.

[0010] Therefore, based on the above problems, the present applicant minimizes the separation space for inserting and arranging the horizontal movement means for carrying out the furnace bottom in Patent Document 3, and does not perform jack-up work. We proposed a method for removing the blast furnace body that can shorten the blast furnace demolition period.

[0011] Further, in Patent Document 4, in the blast furnace body, the upper part of the range to be removed is separated and removed. The foundation concrete or base grout below the area to be cut is cut with a wire saw, and the joint beam and the bottom mantle force are raised together, and during that time, "sliding" is performed as a lateral movement means for carrying out the bottom of the furnace. Disclosed is a method for removing a blast furnace furnace body in which a member is disposed, the furnace body is lowered onto the lateral movement means, moved laterally, and moved out of the furnace body.

[0012] However, when dismantling and removing a large blast furnace, for example, a large blast furnace of 5000 to 6000m3, according to the conventional method, it is necessary to eliminate residues with a furnace bottom force of about 4000t or more. The dismantling period is inevitably prolonged. Also, when the above removal method is applied, the amount of stagnation of the blast furnace furnace body is large, so there is a limit to minimizing the separation space where the lateral movement means for carrying out the bottom of the furnace is placed, and the load of jack-up work is reduced. The period of dismantling will be prolonged without mitigating.

[0013] Further, when the above removal method is applied to the dismantling and removal of a large blast furnace, it requires equipment / equipment of the required scale to lift the furnace bottom of about 4000t or more, and also to carry out the blast furnace bottom. In addition, it requires lateral movement means of the required strength and scale.

[0014] As described above, when dismantling a large blast furnace, the equipment required for dismantling work is inevitably increased in size and complicated in disassembling methods, and the dismantling period is prolonged. In other words, there is currently no suitable demolition method for dismantling and removing large blast furnaces in a short period of time.

Patent Document 1: Japanese Patent Laid-Open No. 10-96005

Patent Document 2: Japanese Patent No. 3684201

Patent Document 3: Japanese Patent Application No. 2004-379284

Patent Document 4: Japanese Patent Application No. 2005-108780

Disclosure of the invention

Problems to be solved by the invention

An object of the present invention is to provide a universal dismantling method that can dismantle blast furnaces in a shorter period of time, including large blast furnaces, in view of the above-described present state of blast furnace dismantling technology.

Means for solving the problem

[0017] The inventor lifts the blast furnace bottom or pushes it up with a jack in order to dispose the lateral movement means at the bottom of the blast furnace bottom. As a result, the dismantling procedure is complicated, and the dismantling is performed. The lateral movement means can be placed on the basic concrete or base grout at the bottom of the blast furnace bottom without lifting the bottom of the blast furnace or pushing it up with a jack. Dismantling method ¾1¾ We studied.

[0018] As a result, the foundation concrete or base grout at the bottom of the furnace bottom is cut horizontally with a wire saw to form a gap of the required height, and the lateral movement means is arranged directly in the gap. For example, it was found that the large-scale equipment required for lifting and jacking up the bottom of the blast furnace was not required, the unloading preparation work was simplified, and the time required for dismantling the bottom of the blast furnace could be greatly reduced.

[0019] The present invention is a method for disassembling a blast furnace bottom part by separating the blast furnace bottom part from a basic concrete or a base grout located below the blast furnace bottom part, and carrying out the following steps 1 to It is characterized by carrying out step 7 and then carrying out step 8 below during the repair period after the blast furnace is blown off.

Step 1: Set multiple cutting sections parallel to the drawing direction of the bottom of the blast furnace at the horizontal cutting plane set in the foundation concrete or base grout located below the bottom of the blast furnace to be carried out.

Step 2: Drill adjacent horizontal holes parallel to the pull-out direction in the foundation concrete or base grout at the boundary of the cutting section.

Step 3: Insert a wire wire into the adjacent horizontal hole, and cut the basic concrete of the cutting section along the upper and lower horizontal planes that maintain the required height. Step 4: Drain the cut foundation concrete or base grout between the upper and lower horizontal cut surfaces to form a gap parallel to the drawing direction.

Step 5: A laterally moving member for carrying out the blast furnace bottom is disposed in the gap. Step 6: A furnace body load support member for supporting the furnace body load is provided in the space between the upper surface of the laterally moving member and the upper horizontal cut surface disposed in the gap.

Step 7: Repeat Step 2 to Step 6 or Step 3 to Step 6, and set the lateral movement means including the lateral movement member ridge and the furnace body load support member to the foundation concrete or base grout. Place it across the entire horizontal cutting area.

Process 8: After separating the upper mantel from the bottom of the furnace, it is lifted and a horizontal force is applied to the bottom of the furnace And take it out of the system.

[0020] According to the present invention as described above, all the lateral movement means for laterally moving the furnace bottom portion can be attached during the operation before the blast furnace blowing, which is disclosed in the patent document. It is possible to reduce the number of installation days of the lateral movement means performed after the blowing.

That is, during operation of the blast furnace, a gap is formed in the foundation concrete or base grout at the bottom of the blast furnace furnace so that a lateral movement means including a lateral movement member and a furnace body load support member can be disposed. The horizontal moving means is taken into the section and the load at the top of the cutting is supported by the horizontal moving means, which can be quickly and reliably prepared and completed over the entire horizontal cutting surface at the bottom of the blast furnace furnace. The number of work days required for the preparation work can be reduced.

[0022] Further, according to the present invention, a large-scale apparatus for lifting or jacking up a heavy blast furnace bottom is not required, and a lateral movement member and a furnace body load support member are provided. Since it is only necessary to arrange the lateral movement means in the gap, the number of work days until completion of unloading preparation, that is, the number of work days required for preliminary construction can be greatly reduced.

[0023] Furthermore, according to the present invention, since it is not necessary to lift the blast furnace bottom, which is a heavy object, a rigid member such as a laying beam is laid on the furnace bottom. ! /, So it cannot be lifted or jacked up), and the bottom of the blast furnace furnace with a large amount of residue remaining can be easily carried out.

As a result, according to the present invention, the dismantling period of the blast furnace furnace body can be greatly shortened.

In the present invention, after arranging a wire guide member for maintaining the wire level of the wire saw constant in the horizontal hole, the wire of the wire saw along the guide member is placed in the horizontal hole. It is desirable to cut the basic concrete or base grout of the cutting section along the upper and lower horizontal planes that maintain the required height.

[0025] In the present invention, it is desirable that a lateral movement guide member for preventing a side slip with respect to the index direction during lateral movement is disposed in all or part of the horizontal hole.

When arranging the wire guide member in the horizontal hole, it is desirable to install the lateral movement guide member after discharging the wire guide member in the horizontal hole.

In the present invention, it is desirable that the wire guide member is a long steel material provided with a tip in the direction of carrying into the horizontal hole and a roller at the tip and the center. [0027] In the present invention, it is desirable that the diameter of the horizontal hole is 60 to 200 mm.

[0028] In the present invention, it is desirable that an interval between the horizontal holes is 0.45 to 5 m.

[0029] In the present invention, it is desirable that the lateral movement member is composed of a floor plate and a sliding plate.

[0030] In the present invention, the furnace body load supporting member is composed of one or a combination of two or more of garnet, small particle size! / Spheroid particles, and mortar. Desire ヽ

[0031] In the present invention, it is desirable that the laterally moving member is composed of a floor plate, a sliding plate, and a lubricant filled between the floor plate and the sliding plate.

In the present invention, it is desirable that the total number of the floor plate and the sliding plate is two or more.

[0033] In the present invention, it is desirable that a lubricant is also supplied to the sliding surface between the floor plate and the sliding plate as a system external force.

[0034] In the present invention, the furnace body load supporting member is a combination of one or more of garnet, small particle size! / Spheroid particles, and mortar, and a high pack anchor (HPA). When

It is desirable that the

In the present invention, a spherical or elliptical iron ball having a small particle diameter and a spherical particle force of a maximum diameter of 10 mm or less is desirable.

[0036] In the present invention, when Step 2 to Step 6 or Step 3 to Step 6 are repeated, it is desirable to appropriately select cutting sections that are not adjacent to each other and to carry out continuously.

Brief Description of Drawings

[0037] FIG. 1 is a diagram showing one aspect of a blast furnace and a furnace body according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view showing the bottom of the blast furnace in the embodiment.

2B is an enlarged cross-sectional view of part 2B in FIG. 2A.

FIG. 3 is a view showing an aspect in which a horizontal cutting portion is set at the bottom of the blast furnace furnace in the embodiment, and a plurality of cutting sections are set at the cutting portion.

FIG. 4 is a diagram showing an example of cutting a cutting section at the bottom of the blast furnace furnace according to the embodiment.

FIG. 5 is a diagram showing a lateral movement means in the embodiment. [6] FIG. 6 is a view showing a base plate in which grooves for filling a lubricant in the embodiment are formed.

FIG. 7A is a diagram showing another aspect of the lateral movement means including a furnace body load support member using a material a.

FIG. 7B is a view showing another aspect of the lateral movement means including the furnace body load support member using the HPA + a material.

FIG. 7C is a diagram showing another aspect of the lateral movement means including a furnace body load support member using HAP alone.

[8] FIG. 8 is a view showing a manner of carrying out the bottom of the blast furnace in the embodiment.

[9] FIG. 9 is a view showing a side surface mode of the bottom portion of the blast furnace furnace immediately before carrying out in the lateral movement means using the floor plate and the sliding plate as the lateral movement member in the embodiment.

[10] FIG. 10 is a diagram showing a plan view of the bottom portion of the blast furnace furnace immediately before unloading in the lateral movement means using the floor plate and the sliding plate as the lateral movement member in the embodiment.

FIG. 11 is a view showing a cross section of the wire guide member in the embodiment.

FIG. 12 is a view showing another cross section of the wire guide member in the embodiment. [13] FIG. 13 is a view showing an aspect of a lateral movement guide member that can be used in the embodiment. [14] FIG. 14 is a view showing a state in which a cut portion of the bottom portion of the blast furnace is pulled out.

[15A] FIG. 15 is a view showing a halfway cutting state of the present invention.

FIG. 15B] is a view showing a halfway cutting state of the present invention.

FIG. 15C] is a view showing a halfway cutting state of the present invention.

[15D] FIG. 15 is a diagram showing a halfway cutting state of the present invention.

圆 15E] is a diagram showing a completed state of the three-surface cutting of the present invention.

FIG. 16 is a diagram showing an example of the present invention.

FIG. 17 is a diagram showing an example of the present invention.

Explanation of symbols

10 Blast furnace

11 Foundation concrete

12 floor beam

13 Blast furnace body Furnace body

Exhaust pipe

Annular tube

Furnace top outrigger crane Temporary overhang deck Loading device

Beam or temporary jack receiving column Post

H-section steel

Cooling pipe

Grout

Furnace bottom plate

Stamp material

Iron skin

Staple cooler Furnace bottom brick layer

Chaotic mass

Remnants

Upper mantel

Furnace bottom mantel

Blast furnace bottom

H-section steel

Lower flange

Upper flange

Wire guide member Horizontal hole

Roller

web 44 flooring

45 Sliding board

46 Sliding surface

47 Upper horizontal surface (cut surface)

48 Lower horizontal surface (cut surface)

49 Horizontal cutting section

50 Center Horne Jack

51a HPA

51b material

52 Suspension bracket

53 Horizontal movement means

54 Groove

55 Lubricant

56 Gap

57 Heavy goods cart

58 Shirt ³ Γ

59 index wire

60 Bracket

61 Lateral guide member

68a 'to 6¾ cutting section

69a '-69k border

70 Fiasau

70a '~ 70j wire

P pump

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described with reference to the drawings.

FIG. 1 shows one embodiment of a blast furnace and a furnace body to which the present invention is applied. The blast furnace 10 is constructed by standing a blast furnace body 13 on a floor beam 12 laid on a foundation concrete 11. [0040] A plurality of exhaust pipes 15 are provided in the upper portion of the blast furnace 10, and the blast furnace 10 and the exhaust pipe 15 are supported by a furnace body rod 14 including struts 22 erected at four locations around the blast furnace 10. ing.

An annular pipe 16 that surrounds the blast furnace 10 is held at the lower part of the furnace body rod 14, a furnace top outrigger crane 17 for carrying the charging device 19 is provided at the upper end portion, and an intermediate portion is provided at the middle portion. There is a temporary extension deck 18 for maintenance inspection and dismantling of the furnace top equipment.

[0041] A beam or temporary jack receiving beam 21 to which a center hole jack 50 capable of supporting the blast furnace main body 13 can be attached is arranged at any level of the furnace body rod that can support the blast furnace. It has been.

The outer side of the blast furnace body 13 is covered with an iron skin 29, and a number of staple coolers 30 are arranged on the inner side.

[0042] After the blast furnace 10 is blown off, inside the bottom brick layer 31 inside the lower part of the blast furnace body 13, the unmixed coatus layer and hot metal or slag are solidified and the kneaded mass 32 remains, Under the kneaded mass 32, a residue 33 that has been cooled and solidified remains.

The blast furnace main body 13 is composed of an upper mantel 34 on the upper side and a mantle 35 on the lower side (containing residual bricks and residue 33).

In the present invention, the bottom beam 12 and the furnace bottom mantel 35 which are integrally joined are used as the furnace bottom part 36.

FIG. 2A shows a cross-sectional structure of the furnace bottom 36, and FIG. 2B shows an enlarged state of the 2B portion.

The floor beam 12 on the foundation concrete 11 is composed of a number of H-shaped steels 23 arranged side by side, and a furnace bottom plate 26 disposed thereon.

A cooling pipe 24 is arranged between the adjacent H-section steels 23, and a grout material 25 or a stamp material 28 is injected and solidified below the cooling pipe 24, respectively.

[0044] Hereinafter, the procedure of the blast furnace bottom disassembly method (the present invention method) according to the present invention will be described. The present invention basically performs the following steps 1 to 7 during the operation of the blast furnace in advance. After that, process 8 is performed during the repair period after the blast furnace is blown off.

[0045] Step 1: Foundation concrete or base located below the bottom of the blast furnace to be carried out Set multiple cutting sections parallel to the drawing direction at the bottom of the furnace on the horizontal cutting plane set in the grout.

Step 2: Drill a horizontal hole parallel to the pull-out direction in the foundation concrete or base grout at the boundary of the cutting section.

[0046] Step 5: A laterally moving member for unloading the furnace bottom is disposed in the gap.

Step 6: A furnace body load support member for supporting the furnace body load is provided in a gap between the upper surface of the laterally moving member disposed in the gap and the upper horizontal cut surface.

Step 8: After separating the upper mantel from the bottom of the furnace, lift it, apply horizontal force to the bottom of the furnace, and carry it out of the system.

[0047] Hereinafter, Step 1 to Step 4 will be referred to as a furnace bottom portion separation step, and Step 5 to Step 8 will be referred to as a furnace bottom portion unloading step.

[0048] (Furnace bottom cutting process)

In FIG. 2B, a horizontal cutting part 49 is set in advance in the foundation concrete 11 below the floor beam 12 of the furnace bottom part 36, and then the cutting part 49 is parallel to the drawing direction of the furnace bottom part 36.

Set multiple cutting sections (Step 1).

Fig. 3 shows one aspect of the set cutting category.

[0049] In Fig. 3, in the horizontal cutting part 49 provided in the foundation concrete 11, 10 cutting sections 68a to 68j parallel to the horizontal movement direction (left and right direction) of the furnace bottom (68)

(Or base grout) is divided into wire saws 70 (ranges to be cut with wires 70a to 70j).

[0050] The width of the cutting section is appropriately set in consideration of the size and weight of the furnace bottom. 450-5 000 mm is preferred. Note that the width of the cutting section need not be constant, and may be set as appropriate in consideration of the weight distribution of the furnace bottom.

[0051] Using a perforator (not shown) at the boundary 69a between the cutting section 68a and the end, the boundary 69b-69j between the cutting sections 68a-68j, and the boundary 69k between the cutting section 6¾ and the end, Drill a horizontal hole of the specified diameter (Step 2). The diameter of the horizontal hole is set as appropriate in consideration of the ease of the subsequent cutting work with a wire saw and ensuring a height sufficient to insert and arrange the lateral movement means in the gap formed by this cutting. A force of 60 to 200mm is preferred U ,.

[0052] If the diameter of the horizontal hole is less than 60 mm, it is difficult to insert the two upper and lower wire saws 70, and even if they can be inserted, the upper and lower two surfaces cannot be cut horizontally. Also, if the diameter exceeds 200 mm, it is difficult to drill long holes (for example, about 20 m), and it takes a lot of time to drill holes with a drilling machine. There is no point in increasing the hole diameter.

[0053] The interval between adjacent horizontal holes is appropriately set in consideration of the size and weight of the bottom of the furnace, the area of the foundation concrete, etc., but is preferably 0.45 to 5m. If the distance between adjacent horizontal holes is less than 0.45 m, the basic concrete with a large resistance at the turn-up portion when the wire saw 70 rotates cannot be cut, and if the distance between adjacent horizontal holes exceeds 5 m, The upper and lower cut surfaces are wavy and it becomes difficult to cut the foundation concrete horizontally.

[0054] Even if it can be cut, the unevenness of the cut surface becomes an obstacle, the friction at the time of drawing increases, it becomes difficult to discharge the cut basic concrete out of the system, and the bottom of the blast furnace The frictional resistance when the slab is moved laterally increases, and it becomes extremely difficult to carry out the bottom of the blast furnace. For example, in the case of a furnace bottom that exceeds a weight of 000 tons, it cannot be carried out.

[0055] Note that the interval between adjacent horizontal holes need not be constant. The dimensions may be changed as appropriate in consideration of the size of the bottom of the blast furnace and the area of the foundation concrete (or base grout).

[0056] The wires 70a to 70j of the wire saw 70 are passed through the horizontal holes drilled in the respective boundary portions, and the basic concrete remaining in the cutting sections 68a to 68j is inserted at a predetermined height interval, that is, a lateral movement means. Cut along the upper horizontal plane 47 and the lower horizontal plane 48 (see Fig. 2B) to ensure a sufficient spacing between them (step 3), and drain the foundation concrete in the cut-out section to remove the void 56 (Fig. 2B). (See step 4). [0057] In the removal method described in Patent Document 4, after applying a release material to the cut surfaces 47 and 48 of the gap 56, the grout material 25 is filled between the cut surfaces 47 and 48, and the furnace bottom 36 is lifted. The lateral movement means (for example, a sliding member) is arranged on the cut surface 48. In the method of the present invention, as described later, it is not necessary to fill the grout material, and it is not necessary to lift the furnace bottom 36. A lateral movement means is arranged in the gap 56.

[0058] When cutting the foundation concrete of a large blast furnace along the upper and lower horizontal planes, wire guide members that guide the movement of the chassis 70 are placed in horizontal holes, and the upper and lower cut surfaces are corrugated in an uneven shape. It is preferable to cut so that the distance between the upper and lower cut surfaces does not change.

[0059] When the wire guide member is disposed in the horizontal hole, the wire of the wire saw 70 cuts the foundation concrete while sliding on the upper surface of the wire guide member, so that the upper and lower cut surfaces maintain a predetermined height interval. It becomes a horizontal plane. As a result, the resistance at the cut surface of the basic concrete when unloading the bottom of the blast furnace becomes small, and the bottom of the blast furnace can be smoothly unloaded.

Here, FIG. 11 and FIG. 12 illustrate a cross-sectional state of a wire guide member made of H-section steel.

The wire guide member shown in FIG. 11 is obtained by attaching a roller 39 that supports the wire guide member 40 to the tip and center of the lower flange 38 of the H-section steel 37. By attaching a roller 39 to the tip and center of the lower flange 38 of the H-shaped steel 37, the wire guide member 40 can be easily inserted into and removed from the horizontal hole 41.

A wire guide member 40 shown in FIG. 12 has a roller 42 that is in contact with the side surface of the horizontal hole 41 at the front end and the center left and right of the web 43 of the H-section steel 37.

[0062] In any wire guide member, the upper flange 39 guides the wire saw 70 that cuts the upper foundation concrete, and the lower flange 38 guides the wire saw 70 that cuts the lower foundation concrete. The cut surface becomes a horizontal plane while maintaining a predetermined height interval.

As a result, the upper horizontal plane 47 is cut by the upper wire saw 70, and the lower horizontal plane 48 is cut by the lower wire saw 70, thereby forming the horizontal cutting portion 49 (two-side cutting). Note that the roller 42 shown in FIGS. 11 and 12 may be attached in combination.

[0063] The height interval for cutting with the wire saw, that is, the height of the gap may be set as appropriate in consideration of the diameter of the horizontal hole and the height of the lateral movement means. 200mm is preferred

[0064] When drilling horizontal holes, there is no particular order in the drilling work, but the order of drilling horizontal holes, cutting the basic concrete in the cutting section, and discharging work may be determined.

[0065] The horizontal cutting means 49 (see Fig. 3) is set over the entire area of the basic concrete at the bottom of the bottom of the blast furnace furnace (see Fig. 3). When drilling the hole and cutting the basic concrete of the cutting sections 68a to 68j repeatedly (Step 2 to Step 6 or Step 3 to Step 6), It may be done sequentially from the direction (eg from 68a to 6¾), but it is preferable to select non-adjacent cutting sections regularly and carry out continuously! / ヽ.

[0066] For example, as shown in FIG. 4, first, the cutting section 68e is cut (1 in the figure), then the cutting sections 68a and 6¾ are cut simultaneously (2 in the figure), and then 68c And the 68g cutting section are cut simultaneously (3 in the figure), and finally the remaining cutting sections are cut simultaneously (4 in the figure).

[0067] As described above, when the drilling / cutting operations are regularly selected and carried out, the load distribution in the foundation concrete can be suppressed, so that the furnace body load is applied almost evenly to the lateral movement means. The work for carrying out the bottom of the blast furnace furnace will be facilitated.

[0068] (Furnace bottom part unloading process)

A lateral movement means is disposed in the gap 56 (see FIG. 2B) (step 6). Then, repeat Step 2 to Step 6 or Step 3 to Step 6, and over the entire area of the horizontal cutting part 49 set in the basic concrete at the bottom of the blast furnace bottom (see Fig. 3), In addition, a lateral movement means having a furnace body load support member is arranged (Step 7).

[0069] In the lateral movement means, the lateral movement member may use, for example, a single sheet or a structure in which one or more sliding plates are placed on one sheet. Good.

In the lateral movement means, the furnace body load support member placed on the lateral movement member is, for example, a single arrangement of HPA (noy pack anchor, fiber bag filled with mortar), HPA and α material (Garnet, small spherical particles, mortar, one or more It is composed of a combination arrangement with only material a.

[0070] In the case where a single sheet is used as the lateral movement member, it is preferable that only the ex material be used as the furnace body load support member.

When a floor plate and a sliding plate placed thereon are used as the laterally moving member, any one of HPA alone, a combination of HPA and α material, or α material alone can be selected as the furnace body load supporting member.

[0071] When using firewood as the furnace body load support member, it is preferable to take measures regarding its fluidity when filling the firewood with mortar.

Specifically, apply coating on the inner surface of the jar (Countermeasure Α), before filling the mortar.

For example, immerse the tub in water (Countermeasure Β), and make a pipe that does not cause a sudden constriction in the mortar channel (Countermeasure C).

[0072] Countermeasure According to モル, the flow of mortar in the HPA is smooth. Without the coating, the mortar may stick and stay in the HPA or form lumps, which may prevent smooth filling of the mortar. However, Measure A can avoid mortar stagnation or lumps and allows smooth filling of HPA.

According to Measure B, the mortar force water filled in the HPA is difficult to separate. HP

When water is separated from the mortar cake introduced into A, mortar stays or lumps in the HPA, but these can be suppressed by countermeasure B and smooth filling can be performed.

Regarding Measure C, if there is a part where the flow path area is suddenly narrowed in the piping leading to the HPA, mortar retention tends to occur. In such a part, for example, by using a guide pipe having a loose conical shape, it is possible to eliminate the sudden restriction and prevent the mortar from staying.

These measures will be described in detail again in the embodiment.

[0073] In FIG. 5, one sliding plate 45 is placed on one floor plate 44 as a laterally moving member, on which

An embodiment of lateral movement means 53 configured by combining HPA5 la and 5 lbs of lumber as a furnace body load support member is shown. A steel plate (SS material) is suitable as the floor plate, and a single layer of SUS material or a multilayer structure of SUS material and SS material is suitable as the sliding plate.

[0074] In the laterally moving member, if the material of the floor plate and the sliding plate is the same, when the lateral movement of the bottom of the blast furnace furnace, slip resistance due to galling easily occurs between the two plates, thereby causing the lateral movement. A large horizontal force is required. Accordingly, it is preferable that the materials of the two plates are different materials.

Examples of applications include: 1. Laying plate SS material, sliding plate SUS material, 2. Laying plate SS material, sliding plate SUS material (lower surface) + SS material (upper surface) force.

In this case, in both cases, the sliding plate SUS material wears between the sliding plate SS material and the sliding plate SUS material that slides when the bottom of the blast furnace furnace is moved laterally. Become.

In addition, by making the sliding plate into a multilayer structure composed of SUS material (lower surface) + SS material (upper surface) as described above, it is possible to make the sliding plate cheaper than a single layer of SUS material having the same thickness.

[0075] The laying plate laid on the bottom surface of the horizontal hole having the concavo-convex surface formed by the wire of the wire saw locally receives the furnace body load via the furnace body load supporting member. Therefore, the thickness of the floorboard is set so that the floorboard is strong enough to withstand the local load. For example, 6 mm or more is preferable. The thickness of the sliding plate does not need to be as strong as that of the floor plate. For example, in the case of a steel plate sliding plate, a steel plate of 2.3 mm or more is sufficient.

[0076] In the configuration of FIG. 5, one sheet and one sliding plate are used, but the laterally moving member may be configured by arranging two or more sliding plates on one sheet. . In this case, if a groove is provided on the top surface of the floor plate and the groove is filled with a system external force lubricant, the sliding between the floor plate and the sliding plate becomes smoother.

[0077] On the other hand, only one floor plate may be used as the lateral movement member. In this case, however, if HAP alone or HAP + α material is placed on the floor plate as a furnace body load support member, the ridge may be damaged during lateral movement. Therefore, when only one sheet is used as the lateral movement member, ΗΑΡ alone and ΗΑΡ + α material is not suitable as a furnace body load support member, and it is desirable to use only α material.

[0078] When the material a is used as the furnace load support member, the material a is preferably filled in a space between the upper surface of the floor plate and the cut surface so as to be in a compacted state. However, in this case, the lateral movement member and the furnace load support member can be easily arranged in the gap, but since only a small lubricating action can be obtained, the indexing force can be increased when the blast furnace bottom is laterally moved. Therefore, an indexing device with a large capacity is required. [0079] On the other hand, when one or more sliding plates are arranged on one floor plate as a laterally moving member, the construction in the gap is more complicated than when α material is used. As the body load supporting member, ΗΑΡ alone, ΗΑΡ + α material, and α material can be used. Further, in this case, the indexing force is very small when the bottom of the blast furnace bottom where the frictional resistance value is small, so that an indexing device with a small capacity can be used.

[0080] As the spherical particles having a small particle size as one kind of the material a, spherical or elliptical iron balls having a maximum diameter of 10 mm or less are preferable. It is preferable to use garnet instead of the spherical particles.

[0081] As described above, in the lateral movement means in which the floor plate and the sliding plate are used as the lateral movement member, a lubricant is filled between the floor plate and the sliding plate, and the sliding plate with respect to the floor plate is placed. It is preferable to make the sliding smooth.

As shown in FIG. 6, a floor plate 44 in which grooves 54 are formed may be used, and a lubricant 55 (for example, oil) may be supplied between the floor plate 44 and the sliding plate by a pump P. Filling the gap between the floor plate and the sliding plate makes it possible to carry out the blast furnace bottom out more smoothly, safely and quickly.

7A to 7C show various modes of the lateral movement means.

FIG. 7A shows an embodiment in which an α material 51b (garnet, spherical particles having a small particle diameter, or one or a combination of two or more mortars) is used as a furnace body load support member.

FIG. 7B shows an embodiment in which HPA51a is filled with 5 lb of alpha material between them. FIG. 7C shows an embodiment using only HPA5 la.

As mentioned above, any one or two of α material and HPA may be used in combination as the furnace load support member.

[0083] Which furnace load support member is selected is determined as appropriate according to the degree of construction difficulty.

. For example, if the gap between the floor plate and the upper surface of the gap is small, and mortar and firewood cannot be placed and installed on the laterally moving member as a furnace load-bearing member, garnet or spherical particles with a small particle size Is preferred to use.

[0084] As described above, the lateral movement means is arranged in the void 56 (see Fig. 2) of the foundation concrete 11.

After (Step 6 and Step 7), the upper mantel 34 separated from the bottom of the blast furnace furnace is lifted, and the blast furnace bottom 36 is carried out of the furnace body 14 (outside the system) (Step 8). FIG. 8 shows how the blast furnace bottom is carried out.

The upper mantel is separated as follows, for example.

[0086] After the horizontal moving means including the horizontal moving member and the furnace body load supporting member are arranged over the entire horizontal cutting portion 49, the blast furnace 10 is blown off, and the upper or middle of the iron skin 29 of the blast furnace main body 13 The suspension bracket 52 is welded and fixed to a plurality of locations, and a plurality of center hole jacks 50 are attached to the furnace body 14, and the blast furnace 10 is connected to the suspension bracket 52 and the center pole jack 50. Suspended and supported by the furnace body 14.

[0087] Next, an intermediate part of the blast furnace furnace body 13, for example, a part below the level 16 of the annular pipe 16 of the blast furnace furnace body 13 (cut line C1 in FIG. 8) and one or more intermediate parts of the blast furnace furnace body 13 are arranged. This section (cut line C2 in FIG. 8) is cut almost horizontally with a predetermined width to separate the upper mantel 34 from the furnace bottom mantel 35 and divide the upper mantel 34 into a plurality of blocks.

At this time, the divided blocks of the upper mantel 34 are suspended and held on the furnace body 14 by the suspension bracket 52 and the center hole jack 50, respectively.

After the upper mantel 34 is held in the furnace body 14 in this manner, first, the blast furnace bottom portion 36 including the furnace body mantel 35 is carried out of the furnace body 14 (outside the system).

Next, operate the center hole jack 50 that suspends the lowermost block of the upper mantel 34, and lower the block onto the unloading device (for example, rollers, sliding plates, carts, etc.) installed on the foundation, As with the blast furnace bottom 36, it is carried out of the furnace body.

Similarly, each block of the upper mantel 34 is sequentially unloaded from the lower one, and all of the upper mantel 34 is unloaded.

As a result, the blast furnace body 13 is carried out of the furnace body.

[0088] The furnace top equipment such as the charging device 19 is dismantled and removed using the furnace top outrigger crane 17 and the temporary extension deck 18.

When carrying them out, construction machines such as dollies and crane cars may be used. Semi-fixed equipment such as conveyors may be installed, or a combination of these may be used.

Here, FIGS. 9 and 10 show a state immediately before carrying out when a floor plate and a sliding plate are used as the lateral movement member of the lateral movement means. Fig. 9 shows a side view thereof, and Fig. 10 shows a plan view thereof. Indicates.

[0090] A heavy material transport cart 57 is installed adjacent to the foundation concrete 11, and a floor plate 44 disposed in the gap of the foundation concrete 11 is extended on the upper surface of the heavy material transport cart 57. Has been. In this state, the blast furnace bottom 36 is laterally moved to the upper surface of the heavy material transport cart 57 by pulling a pulling wire 59 having one end fastened to a bracket 60 fixed to the blast furnace bottom 36 by the jack 58.

[0091] At this time, it is necessary to prevent the side slip in the index direction of the blast furnace bottom 36. In order to prevent this side slip reliably, for example, the lateral movement guide member 61 shown in FIG. Or you can place it in part.

By using this lateral movement guide member, the bottom of the blast furnace furnace can be carried out more safely, smoothly and quickly without sliding sideways in the index direction.

Another way to prevent skidding is to install guide rails outside the bottom mantel.

, Skidding may be prevented.

[0092] The lateral movement guide member may be disposed in the gap immediately after the upper mantel separated from the blast furnace bottom force is lifted, or may be performed together with the lateral movement means. As the lateral movement guide member, a steel pipe is usually preferable.

[0093] (Other Embodiments)

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and the material of each part, the number and arrangement of elements, and the like may be changed as appropriate during implementation. Modifications and the like within a range where the object can be achieved are included in the present invention.

[0094] In the embodiment described above, the horizontal cut portion 49 of the furnace bottom portion 36 is cut into two planes by the upper horizontal plane 47 and the lower horizontal plane 48 (see Fig. 2B, Fig. 12 and Fig. 13). As you can see, there are three-sided cuts!

As described above, when cutting with the wire saw 70, the cut surface has an uneven shape due to the shake of the intermediate portion of the rotationally driven wire saw 70, the load of the blast furnace body, and the like.

In FIG. 14, the upper horizontal plane 47 and the lower horizontal plane 48 are formed by cutting with the wire saw 70, and the cut portion 36A between them can be pulled out in the horizontal direction. Cut Surfaces 47A and 48A of the protruding portion 36A are formed by cutting with a laser 70 in the same manner as the upper horizontal plane 47 and the lower horizontal plane 48, and have a predetermined interval with respect to the upper horizontal plane 47 and the lower horizontal plane 48 (wire saw 70 (Corresponding to the thickness of the).

[0096] When such a cut-out portion 36A is extracted in the horizontal direction, the convex portions (47B, 48B) of the surfaces 47A, 48A of the cut-out portion 36A become convex portions (47 C, 48C) of the upper horizontal plane 47 and the lower horizontal plane 48. It may interfere with the drawer and may become difficult to pull out.

In particular, when the adjacent distance between the horizontal holes 41 to be drilled first is large (5 m or more), the swing width of the wire saw 70 also increases. This is not preferable because each becomes larger and it is necessary to reinforce the pull-out force with large interference when pulling out in the horizontal direction.

On the other hand, the above-described interference can be greatly reduced by performing the three-surface cutting as shown in FIGS. 15A to 15E. In the following process, FIGS. 15A to 15C are the same as the two-sided cutting described above, and three-sided cutting is realized by adding FIGS. 15D and 15E.

First, as shown in FIG. 15A, a wire guide member 40 using H-shaped steel 37 similar to that of the above embodiment is introduced into the horizontal hole 41 of the furnace bottom portion 36, and the wire saw 70 is guided by the upper flange 38. While cutting. As a result, the furnace bottom 36 is cut at the upper horizontal plane 47.

Next, as shown in FIG. 15B, the wire saw 70 is cut while being guided by the lower flange 39. As a result, the furnace bottom 36 is cut at the lower horizontal plane 48, and a region sandwiched between the upper horizontal plane 47 and the lower horizontal plane 48 is cut out as a cut-out portion 36A.

[0099] By these cuttings, a gap of thickness D1 is generated between the furnace bottom portion 36 and the cut-out portion 36A as a cut mark by the wire saw 70 guided by the upper flange 38, and the wire saw 70 guided by the lower flange 39. A gap of thickness D2 is generated as a trace of cutting due to.

As shown in FIG. 15C, the cutout portion 36A that has lost its support due to the cutting sinks due to gravity, and a gap D3 is formed only above the cutout portion 36A. The gap D3 corresponds to the sum of the gap D1 and the gap D2 described above.

In this state, the wire guide member 40 is extracted. By the processing so far, the two-sided cutting corresponding to the above-described embodiment is performed. Subsequently, as shown in FIG. 15D, the wire guide member 40A for introducing another wire guide member 40A into the horizontal hole 41 includes guide plates 40B and 40C and a lifting prevention plate 40D. These guide plates 40B and 40C and the lifting prevention plate 40D are each formed of a steel plate, and in the cross-sectional shape, the guide plates 40B and 40C are arranged in parallel to each other, and the lifting prevention plate 40D is disposed at a right angle to the guide plates 40B and 40C. ing.

[0101] The wire guide member 40A is held so that the guide plates 40B and 40C are horizontal and the anti-lifting plate 40D is vertical when installed in the horizontal hole 41. The upper surface of the lower guide plate 40B is disposed approximately in the middle (slightly below the middle) of the cut-out portion 36A, and the wire saw 70 is guided to the height on this upper surface. The upper guide plate 40C is disposed such that its lower surface is lower than the upper surface of the cut-out portion 36A, and restricts the movement so that the force of the cut-out portion 36A does not come off even when the wire saw 70 shakes. The floating prevention plate 40D prevents the wire guide member 40A from floating by contacting the upper inner surface of the horizontal hole 41. By maintaining the guide plates 40B and 40C at a predetermined height in the horizontal hole 41, The guide function of the wire saw 70 by the guide plates 40B and 40C described above is properly maintained.

[0102] By cutting while guiding the wire saw 70 with such a wire guide member 40A, the cut-out portion 36A is cut at the intermediate horizontal plane 49A. By this cutting, the cut-out portion 36A is divided into an upper portion 36B and a lower portion 36C, and a gap having a thickness D4 is generated between them as a cut mark by the wire saw 70.

As shown in FIG. 15E, in the cutout portion 36A, the upper portion 36B that has lost its support due to cutting sinks due to gravity and overlaps with the lower portion 36C, and a gap D5 is formed only on the upper side of the cutout portion 36A. The gap D5 corresponds to the distance obtained by adding the gaps D3 and D4 described above, that is, the distance obtained by adding the distances Dl, D2, and D4 of the three cuts.

In this state, the wire guide member 40A is extracted. By the processing so far, the three-sided cutting is performed, and a larger gap D5 than the two-sided cutting described above is obtained. For this reason, even when the upper horizontal plane 47 and the lower horizontal plane 48 are uneven, the large gap D5 can avoid interference during pulling out, and the cutout portion 36A can be pulled out smoothly.

[0103] (Example) Hereinafter, specific examples based on the above-described embodiment of the present invention will be described.

The bottom of the blast furnace erected on a 21mX 21m foundation concrete was carried out of the system using the lateral movement means shown in Fig. 5 described above.

The position 1.5m below the bottom of the furnace was set as a horizontal cutting section, and 13 cutting sections with a width of 1.5m were set in the cutting section. A horizontal hole with a diameter of 100 mm was drilled at the boundary of the cutting section, and the foundation concrete between the horizontal holes was cut horizontally at a height interval of 70 mm, and the foundation concrete in the cut part was discharged.

[0104] Here, the lateral movement means shown in Fig. 5 described above was arranged, and the furnace bottom was carried out. As a result, it took 13 days from the blast furnace blowing to the completion of the removal of the bottom of the furnace.

The number of work days has been greatly reduced compared to the 17 work days previously required to carry out the bottom of the furnace of the same scale.

[0105] The conditions of the above-described embodiments are one example of conditions used for confirming the feasibility and effects of the present invention, and the present invention is not limited to these one condition examples. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0106] (Example of mortar filling into HPA)

In the embodiment described above, it has been described that when HPA is used as the furnace body load support member, it is preferable to take measures related to the fluidity of the mortar filled in the HPA.

Here, specific examples regarding each countermeasure will be described.

(1) Test equipment

In the configuration shown in FIG. 5 described above, that is, one sliding plate 45 is placed on one floor plate 44 as a laterally moving member, and HPA51a and α material 51b are placed in combination on it as a furnace body load support member. The lateral movement means 53 configured as described above was used.

Six HPAs 51a are provided, each of which has a cylindrical shape made of laminated fibers, and the length of the horizontal portion is about 18 m.

[0107] In order to fill such HPA 51a with mortar, a mortar filling pipe was connected to one end thereof. As shown in FIG. 16, the mortar filling pipe 51c has a 50A diameter pipe arranged vertically and is filled with non-shrink mortar using a head pressure of 2 m in height. The lower end of pipe 5 lc is bent in the horizontal direction and connected to HPA51a. The end of the HPA 51a is drawn out from the furnace bottom 36, and is put on the lower end of the pipe 51c and fixed by a fastening band 51d.

[0108] In such a configuration, when the mortar was filled from the pipe 51c and the mortar flowed out from the other end of the HPA 51a, it was determined that the HPA 51a was sufficiently filled.

[0109] (2) Test conditions

Six examples were examined by combining the countermeasures (Countermeasure A to C) described in the previous embodiment.

Example 1: No measure A, no measure B, no measure C ... No measures

Example 2; Measure A implemented, Measure B absent, Measure C absent. ... Countermeasure A only

Example 3; No measure A, no measure B, no measure C ... Countermeasure B only

Example 4; No measures A, no measures B, measures C implemented. ... Countermeasure C only

Example 5: Measure A implemented, Measure B absent, Measure C implemented. ... Countermeasure C + Countermeasure A

Example 6: No measure A, measure B implemented, measure C implemented. ... Countermeasure C + Countermeasure B

[0110] Here, the contents of each countermeasure are as follows. Apply coating to the inner surface of the HPA (Countermeasure A), immerse the HPA in water before filling the mortar (Countermeasure B), and piping that does not cause a sudden squeeze in the mortar flow path. (Countermeasure C)

Of these, measure C is as follows.

[0111] In the configuration shown in FIG. 16 (without countermeasure C), the mortar introduced into the HPA 51a from the pipe 51c with a 50A diameter is subject to a rapid restriction when introduced into the furnace bottom 36. ing.

As shown in Fig. 17, as measure C, a loose throttle pipe 51e is installed in the part introduced from the pipe 51c to the HPA 51a, and the pipe 51c is also changed to a smaller diameter 32A. The throttle tube 51e has a diameter of 32A at the base end and is connected to the end of the pipe 51c, and a thin tube at the front end. The throttle tube 51e is inserted into the HPA5 la in the furnace bottom 36 for a length of 100 mm. Yes. The distal end side and the proximal end side of the throttle tube 51e are formed into a very gentle conical shape. Mortar from c is squeezed very gently and introduced into HPA51a.

[0112] (3) Test results

Example 1; No countermeasure.

The mortar filling was inadequate for mortar outflow from any HPA5 la outlet (the end opposite to the inlet side where mortar was injected). It is presumed that the water in the mortar was squeezed out through the HPA at the sharply squeezed part of the HPA51a inlet, creating a mortar mass and blocking the flow.

Example 2; Countermeasure A only.

Example 3; Measure B only.

The mortar filling that mortar outflow was not sufficient for all HPA5 la outlet forces was insufficient. As described in Example 1, it is presumed that the water in the mortar was squeezed out through the HPA at the sharply squeezed portion of the HPA5 la inlet, forming a mortar mass, and blocking the flow. For this reason, Measure A and Measure B, which cannot be introduced into HPA51a, have not functioned effectively.

[0113] Example 4; Countermeasure C only.

Outlet force of each HPA51a Mortar outflow was confirmed. From the countermeasures, it is estimated that the mortar water was squeezed out and the flow was not blocked by the generation of mortar lump.

Example 5; Solution C + Solution A.

Example 6; Measure C + Measure B

More outlets of mortar were confirmed for each HPA51a outlet force. It is estimated that squeezing of mortar water was suppressed over the entire length of HPA51a by Measure A or Measure B in addition to damming cancellation by Measure C described in Example 4.

[0114] As described above, when HPA is used as a furnace body load support member, it is desirable to adopt the above-mentioned measure C, and it is further desirable to use measures A and B together. Industrial applicability

[0115] The present invention can be used as a method of dismantling the blast furnace bottom for dismantling the furnace bottom in a short time in blast furnace renovation.

Claims

The scope of the claims

[1] A method of dismantling the bottom of the blast furnace by separating the blast furnace bottom from the basic concrete or base grout located below the bottom of the blast furnace, and carrying out the following steps 1 to 7 in advance during the operation of the blast furnace. A method for dismantling the bottom of the blast furnace, characterized in that the following step 8 is performed during the refurbishment period after the blast furnace is blown off.

Step 5: A laterally moving member for carrying out the blast furnace bottom is disposed in the gap. Step 6: A furnace body load support member that supports the furnace body load is disposed in the gap between the upper surface of the laterally movable member disposed in the gap and the upper horizontal cut surface.

Step 7: Step 2 to Step 6 or Step 3 to Step 6 are repeated, and the horizontal moving means including the horizontal moving member and the furnace body load supporting member is set to the foundation concrete or the base grout. Arrange over the entire area of the cutting section.

Process 8: After separating the upper mantel from the bottom of the blast furnace, lifting and fixing it, apply horizontal force to the bottom of the blast furnace and carry it out of the system.

[2] The method for disassembling a blast furnace bottom according to claim 1, wherein a lateral movement guide member for preventing a side slip in a pulling direction during lateral movement is arranged on all or a part of the horizontal hole.

[3] After arranging a wire guide member for maintaining the wire level of the wire saw constant in the horizontal hole, the wire saw member is inserted along the guide member of the horizontal hole, and the basis of the cutting section The top of the concrete or base grout to maintain the required height 2. The method for disassembling a blast furnace bottom according to claim 1, wherein cutting is performed along a horizontal plane and a lower horizontal plane.

[4] The lateral movement guide member for preventing a side slip in the indexing direction at the time of lateral movement is disposed in all or a part of the horizontal hole after the wire guide member is discharged. Of dismantling the bottom of the blast furnace.

[5] The wire guide member according to claim 3 or 4, characterized in that the wire guide member is a long steel material having a tip in the direction of carrying into the horizontal hole and a roller at the tip and the center. Of dismantling the bottom of the blast furnace.

[6] The method for disassembling a blast furnace bottom according to any one of claims 1 to 5, wherein the horizontal hole has a diameter of 60 to 200 mm.

[7] The method for disassembling a blast furnace bottom according to any one of claims 1 to 6, wherein an interval between adjacent horizontal holes is 0.45 to 5 m.

[8] The laterally moving member comprises a floor plate and a sliding plate.

7. The method for dismantling the bottom of the blast furnace as described in any of the above.

[9] The furnace body load supporting member is composed of one kind or a combination of two or more kinds of garnet, small particle size! /, Spherical particles, and mortar. The method of dismantling the bottom of the blast furnace furnace as described in.

[10] The bottom portion of the blast furnace furnace according to any one of claims 1 to 8, wherein the laterally moving member includes a floor plate, a sliding plate, and a lubricant filled between the floor plate and the sliding plate. Dismantling method.

11. The method for disassembling a blast furnace bottom according to claim 10, wherein the total number of the floor plate and the sliding plate is two or more.

12. The method for disassembling a blast furnace bottom according to claim 10 or 11, wherein a system external force lubricant is supplied to a sliding surface between the floor plate and the sliding plate.

[13] The furnace body load support member is composed of one or more combinations of garnet, small particle size! / Spherical particles, mortar, and a high pack anchor (HPA). The method for disassembling a blast furnace bottom according to any one of claims 10 to 12, wherein:

[14] Spherical particle force with a small particle size The spherical or elliptical iron ball with a maximum diameter of 10 mm or less The method for disassembling a blast furnace bottom according to claim 9 or claim 13, wherein the method is for disassembling. The step 2 to step 6 or the step 3 to step 6 are repeatedly performed by appropriately selecting cutting segments that are not adjacent to each other. Of dismantling the bottom of the blast furnace.