JP2008231491A - Method for removing remaining pig iron in blast furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for safely removing solidified pig iron remaining in the bottom of a blast furnace in a short period of time, when repairing the furnace. <P>SOLUTION: The method for removing the remaining pig iron 1 includes dividing the solidified pig iron 1 remaining in the bottom of the furnace into pig iron blocks 9, and drawing out the blocks from the furnace to remove it, when repairing the blast furnace. The method further includes: cutting the remaining pig iron 1 into large and intermediate pig iron blocks 8 by using a wire saw; further dividing the blocks 8 into the pig iron blocks 9 by blasting; and drawing out the pig iron blocks 9 from the furnace. Thereby, the method can make the scale of individual blasting small while keeping the efficiency of the blasting, and can surely remove the remaining pig iron in a short period of time, in comparison with a conventional method of dividing the remaining pig iron into small pieces only by the blasting and removing them. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for removing residues that can be removed in a short period of time and safely after the blast furnace is refurbished.

  When refurbishing the blast furnace, the contents are cooled and solidified by pouring water into the furnace contents that are in a high-temperature molten state. This solidified content remains at the bottom of the furnace. Residue with high specific gravity remains in the furnace bottom and is integrated, and its weight ranges from 300 to 2000 tons. The removal of the residue remaining on the bottom of the furnace is an indispensable process for dismantling the blast furnace body, and becomes a critical path when the blast furnace is repaired. There have been many cases in which the removal of the ruins did not proceed as planned and caused a delay in the repair period, which is a very difficult task.

  Since the residue has a high specific gravity and high hardness, it has been considered that crushing means by blasting is the most suitable method for breaking up in a short period of time. Yes. Therefore, the technology developed by the residue removal method in the blast furnace repair is mainly a means for efficiently crushing and removing the residue by blasting, a technology related thereto, and mechanization thereof (see Patent Document 1).

FIG. 12 is an image diagram of a conventional method for removing residues by blasting, and FIG. 13 is a plan view showing an example of residue splitting by blasting.
In FIG. 12, the refractory brick 12 is lined on the inner peripheral surface of the iron shell 11 surrounding the outer periphery of the blast furnace 10, and the refractory brick 2 is formed by laminating the refractory brick on the furnace bottom.

  At the time of blast furnace renovation, in order to remove the residue 1 solidified by cooling, two openings are formed in the facing direction of the iron core at the bottom of the furnace to form a working opening 13 having a height of about 4 m and a width of about 4 m. Then, the residue 1 is exposed. A blasting hole is drilled in the exposed residue 1 with a drill of the residue punch 15. The depth of the blasting hole is about 1.5 m. The explosive is loaded into this blasting hole, blasted and subdivided. The small residue 1 is carried out by scraping it using a heavy machine 16 such as a bulldozer excavator. By the above operation, the steel is sequentially moved from the opening position of the outer peripheral portion of the residue toward the center of the furnace, and is repeatedly removed in order from the number (1) shown in FIG.

On the other hand, a technique has been developed in which the entire structure of the blast furnace is repaired by removing the upper structure of the blast furnace and then cutting the residue and the bottom of the furnace horizontally from the base portion and taking them out integrally (see Patent Document 2).
In this technology, when taking out the integrated furnace bottom and residue, a through hole is drilled in the basic concrete or base grout of the bottom of the furnace, and a wire saw is passed through. Cutting along the dividing plane, filling the cutting gaps created by this cutting with spherical particles, applying a horizontal force to the part above the dividing plane to move it horizontally, and removing it outside the furnace.

JP 2000-256717 A JP 2006-183105 A

However, the conventional removal work of trash by blasting has the following problems.
First, there is a problem that the construction period becomes longer because it is necessary to repeat the breakage by blasting. That is, the amount of excavation in the core direction by demolition of residue after one blast is about 1.5 m from the periphery of the residue, and in order to reach the center of the residue, the number of times according to the distance to the center of the residue Must be blasted. Further, since the area of the cutting face becomes wider as it goes in the direction of the core, in order to dig a distance of 1.5 m over the entire cutting face, a large number of holes for blasting and the number of times of blasting are required. For this reason, although it depends on the amount of residue, it takes a very long time to complete the removal of the residue, and in the past results, when removing 300 tons of residue by blasting, It took 7 days, and about 1500 tons, it took about 14 days.

  Secondly, there is a problem of preventing surrounding influences due to blasting. In other words, since the method of removing residues by blasting involves danger, thorough safety measures are required. In addition, when crushing the residue by blasting, the peripheral equipment is damaged due to the blast at the time of the blasting or the scattering of small pieces of the residue, so repair of the damaged equipment was necessary. In order to prevent damage to the peripheral equipment, a large portion of the iron opening for carrying out the small residue is invested in safety measures such as installing temporary equipment to prevent scattering.

  As a means to prevent such influences on the surrounding area, a mantel (such as an iron skin that forms the exterior structure of the blast furnace) that is normally removed during refurbishment is placed around the remnant to provide a protective wall to prevent scattering. It is also used. However, when diverting mantel, it was necessary to provide a protective wall to prevent damage to mantel due to blasting, and enormous curing costs were invested.

  By the way, in the method of cutting the furnace bottom portion with a conventional wire saw, since the blasting is not performed, the above-mentioned problem due to the blasting can be solved. However, since the furnace bottom part cut with the wire saw is taken out together with the residue, it cannot be applied to the case where only the partial repair of the furnace bottom is performed while leaving the superstructure of the blast furnace.

  Therefore, the present invention provides a residue removal method that can safely remove the solidified residue remaining in the furnace bottom in a short period of time when refurbishing the blast furnace.

According to the method for removing residues of the present invention, when refurbishing a blast furnace, the residues remaining on the bottom refractory are divided into a plurality of vertical dividing surfaces and removed as residue blocks to the outside of the furnace. A method for removing a cocoon,
Cutting the residue with a cutter along the primary division planned surface set in the residue and dividing it into a plurality of residue blocks,
Blasting along a secondary division planned plane that is set to any of the divided residual blocks and intersects the primary division planned plane, and further divides the residual block into a plurality of residual blocks,
These residual blocks are sequentially drawn out of the furnace.

In such this invention, after performing the division | segmentation (primary division | segmentation process) based on a primary division | segmentation planned surface using a cutter, the division | segmentation (secondary division | segmentation process) based on the secondary division | segmentation planned surface by blasting is performed.
In the primary division process with the preceding cutter, the residue is cut with a cutter, so the conventional problems associated with blasting, that is, the problem of process management of removal work, and the problem of safety measures against blast and scattering of small pieces of residue do not occur. .
In the subsequent secondary dividing step by blasting, blasting of the residual block that has already been divided by the cutter, the blasting can be reduced in size and the number of times can be greatly reduced as compared with the conventional method. For this reason, the conventional problem accompanying blasting can be minimized while performing efficient division by blasting. Such downsizing of blasting in the secondary division process is mainly based on the following reasons.

First, in this process, the degree of freedom of the portion divided by blasting is increased. In other words, in conventional blasting, for example, a C-shaped block is divided from a lump of residue, so that the portion to be divided is continuously fixed to the periphery, and the portion to be divided has no freedom of movement. . For this reason, the division | segmentation of the part requires a big force and the scale of blasting becomes large. On the other hand, the residual block already divided by the cutter is already separated from the surroundings, and the degree of freedom of movement is obtained in the direction along the division surface by the cutter (direction along the primary division planned surface). Blasting in the same direction can be made small enough.
Secondly, the remnant blocks that have already been divided by the cutter are separated from other surrounding remnant blocks, but are surrounded by these other remnant blocks, so the effects of blasting are It is difficult to spread and contributes to ensuring safety.

  As described above, in the present invention, the primary division by the cutter is performed first, and then the secondary division process by blasting is performed, thereby minimizing the influence of blasting as a whole, and the efficiency using small-scale blasting. Division work can be performed. As a result, it is not necessary to consider the removal depth of the residue that affects the process progress management as in the case where all of the residue is subdivided by conventional blasting, and the management of the removal operation is simple. In addition, since blasting can be done on a small scale, it is possible to minimize the explosion of blasts and remnants, ensuring safety and reducing temporary costs such as installing protective walls.

In the residue removal method of the present invention, a plurality of the primary division planned surfaces are set in the residue, and these primary division planned surfaces are a plurality of division lines parallel to the pull-out direction of the residue blocks, or It is desirable to set it along a plurality of dividing lines that widen toward the end in the pull-out direction.
In the present invention, the residue at the bottom of the furnace is divided into a plurality of residue blocks along a plurality of primary division planned surfaces. Here, if a plurality of primary splitting planes are set parallel to each other, the divided residual blocks become so-called strips extending in parallel to each other, and this strip is further divided into a plurality of parts in the subsequent secondary splitting. This can be done and the work can be simplified.

  On the other hand, the residual blocks can be taken out smoothly by arranging a plurality of scheduled primary division surfaces at a slight angle from parallel to each other and disposing them in a planar shape. That is, by moving the residue block to the side where the above-mentioned spread is widened, the interval between the residue blocks is widened. That is, by making it widen at the end, a removal allowance is formed, and there is no contact with an adjacent residue block, and smooth drawing can be performed.

  In addition, when the wire saw utilized for a building structure is utilized as a cutter, the clearance gap between residue cutting parts is about 10 mm, and the space | interval between the residue blocks after a cutting | disconnection is narrow, but a cut surface is smooth. For this reason, even when pulling out the residual block between other residual blocks, the unevenness of the cut surface of the adjacent residual block does not interfere with each other, and there is some unevenness, and these are in contact with each other. However, since the cut surface of the residue is slippery, the residue block can be pulled out easily.

In the residue removal method of the present invention, it is preferable that a plurality of the primary division planned surfaces are set in the residue, and the plurality of cutters are cut in parallel along any of the plurality of primary division planned surfaces. .
In such this invention, working efficiency can be improved by working in parallel with a some cutter along a some primary division | segmentation planned surface compared with the case where a some primary division | segmentation planned surface is cut | disconnected sequentially.

In the residue removal method of the present invention, a wire saw is used as the cutter, and a bottom bottom through-hole is drilled in the furnace bottom refractory along the primary division planned surface. It is desirable to insert a wire saw, run the wire saw along the primary division planned surface, cut the residue and the furnace bottom refractory, and divide the residue into a plurality of residue blocks.
In the present invention, even a large residue can be reliably cut by using a wire saw as a cutter, and the wire saw is removed through a bottom through-hole formed in the bottom refractory. It can be passed downward, and cutting with a wire saw can be performed smoothly and easily. Moreover, the direction of the primary division | segmentation by a wire saw can be correctly guided by making this residual bottom through-hole correspond to the primary division | segmentation planned surface.

In the residue removal method of the present invention, when the residue is cut with the wire saw, the surface of the residue is communicated with the residue bottom through-hole from the surface of the residue along the primary division planned surface. By drilling a through hole in the residue and inserting the wire saw into the through hole in the residue and the through hole under the residue, the residue is divided into the residue through the primary splitting surface. It is desirable to carry out for each of a plurality of sections separated by holes.
In such this invention, a primary division | segmentation planned surface can be divided | segmented into a some division by the through-hole in a residue, and the cutting | disconnection by a wire saw can be performed for every division. For this reason, the cutting area of the residue in each division which should be cut at a time with a wire saw can be adjusted. For example, the length around the cut surface of each section can be suppressed according to the maximum length of the wire saw used for cutting. Moreover, adjustments such as making the cut area of each section uniform are also possible.
The cutting area of each section can be adjusted according to, for example, the cutting load corresponding to the life of the wire saw in consideration of the life accompanying the wear of the wire saw.

In addition, when dividing such a primary division | segmentation planned surface into a some division, it suffices to first cut all the divisions along the primary division planned surface and then perform secondary division of the divided residual blocks. Alternatively, once one of the sections of the primary division is cut, the process of dividing the residual block facing the section into the secondary division may be repeated sequentially.
Moreover, about equalization of the cutting area in each division, it can respond according to the thickness of each residue in the operation | work with respect to a different blast furnace not only during the removal operation | work of the same blast furnace. For example, if the residue in a certain blast furnace is thick, the interval between the sections is shortened. Conversely, if the residue is thin, the interval between the sections is set long, so that the wire saw is cut in each cutting operation. Efficient work is possible by keeping the load constant.

In the residue removal method of the present invention, in the division by blasting, a blasting hole is first drilled along the secondary division planned surface, and an explosive is loaded into the blasting hole, and the gunpowder is ignited. Preferably, the blasting hole is drilled from the surface of the residue to a predetermined depth using a drilling machine.
In the present invention, blasting can be carried out by loading explosives into the previously formed blasting holes, and these blasting holes are formed along the secondary split planned surface. The next division can be performed at an accurate position. At this time, the blasting hole is drilled from the surface of the residue along the planned secondary division surface. For this reason, on the surface of the residue, the positional relationship between the primary division planned surface and the cut surface along this or the through hole in the residue prior to cutting and the secondary division planned surface and the blasting hole along this is clear. Since all of them are perforated from the surface, the work can be performed in parallel as appropriate.

In the residue removal method of the present invention, it is preferable that the residue internal through hole and the blasting hole are sequentially processed by the same punching machine.
In the present invention, since each drilling operation can be performed by the same drilling machine, it is possible to omit the time for exchanging the machine when using individual drilling machines, and a great improvement in work efficiency can be expected. For example, if the through-holes in the residue are first processed sequentially and then the blasting holes are sequentially processed, the surface of the residue will be traversed at least twice. It is also possible to process at a time, and efficiency can be expected also in this respect.
The through-holes in the residue pass through the residue from the front surface to the bottom bottom through-hole, but the blasting hole stays at a shallower position, so the drilling machine adjusts the drilling depth according to each. It is necessary to.

In the residue removal method of the present invention, it is desirable that the residue through hole and the blasting hole are sequentially processed in parallel by a plurality of punching machines.
In the present invention, by processing the residue from the surface for forming the through-holes in the residue and the blasting holes in parallel with a plurality of punches, each hole can be processed by a single punch. The work efficiency can be improved as compared with the case of sequentially processing.

In the residue removal method of the present invention, when cutting the residue with the wire saw, it is desirable to continuously supply a cooling fluid to a path along which the wire saw travels and cut the wire saw while cooling.
In the present invention, even a high-heat residue that has just been cooled and solidified can be cut by continuously supplying a cooling fluid to a path along which the wire saw travels and cooling the wire saw. This makes it possible to shorten the construction period.

  In the residue removal method of the present invention, when the residue block is pulled out of the furnace, the top surface level of the residue block carry-out carriage or residue block carry-out stand is adjusted to the same level as the bottom surface of the residue block to be drawn out. Next to the residue block, a horizontal force is applied to the residue block to cause a slip between the residue block and the remaining furnace bottom refractory, and the residue block is moved horizontally to be pulled out and left behind. The residue block is loaded on the unloading carriage of the dredging block or the unloading stand of the remaining block, or the remaining block is jacked up, and the remaining block is formed in the space formed between the remaining block and the remaining furnace bottom refractory Is placed under the residue block, the residue block is jacked down and loaded on the mover, and the mover loaded with the residue block is moved horizontally to leave the residue block. It may be drawn out to the outside of the furnace.

  In the present invention, when the residue block is pulled out of the furnace, it is installed next to the unloading carriage residue block of the unloading carriage or the residue block, and the residue block is loaded, or the residue block is jacked. The residue block can be easily carried out by loading the residue block on the moving device and pulling it out of the furnace.

  The method of removing the residue of the present invention is further divided by blasting after cutting the residue using a cutter such as a wire saw to make a large residue block, and pulling this residue block out of the furnace, Compared to the conventional method of removing the residue by dividing it by blasting, the residue can be reliably removed in a short period of time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First embodiment]
This embodiment removes the residue of the bottom of a blast furnace based on the present invention, and as a preparatory work, (1) removal of the iron skin, (2) setting of the dividing surface, and as this work ( 3) Drilling with a punching machine, (4) Primary splitting with a wire saw, (5) Secondary splitting with blasting, and (6) Pulling out residual blocks.
In the present embodiment, in order to cope with the case where the thickness of the residue is relatively large, the primary and secondary divided sections in the planar shape are relatively fine, and the planar shape of the residue block finally cut out is small. is there.

  FIG. 1 is a plan view showing the bottom of a blast furnace where residue remains, FIG. 2 is an elevation view showing the bottom residue and a drilling machine, and FIG. 4 is a longitudinal sectional view of the residue and furnace bottom refractory showing each through hole and blasting hole, FIG. 5 is a schematic diagram showing primary division by a wire saw, FIG. 6 is a schematic diagram of a wire saw, and FIG. 7 is by blasting. It is the schematic which shows extraction of a secondary division and a residue block.

1 and 2, when the blast furnace 10 is repaired, the residue 1 cooled and solidified by pouring water remains on the furnace bottom refractory 2 made of a stacked structure such as carbon brick. The residue 1 includes a residue body 4 and a surface slag 3. That is, when the residue 1 is solidified, the slag 3 remaining on the surface of the residue body 4 is also cooled and solidified, and is attached to the surface of the residue body 4 and integrated.
The blast furnace 10 is provided with an iron skin 11 as an exterior, and a refractory material 12 such as a refractory brick is disposed inside the blast furnace 10, but the refractory material 12 is removed during refurbishment, and the residue 1 remains in a flat cylindrical shape at the bottom of the furnace. is doing.
From this state, based on the residue removal method of the present invention, first, as a preparatory work, the following (1) removal of the iron skin and (2) setting of the dividing surface are performed.

(1) Removal of the iron shell First, at the level of the residue 1 at the lower part of the furnace body, the iron shells 11 that are opposed to each other are removed to provide a working opening 13. These working openings 13 are arranged so as to face the pulling direction (arrow D in FIG. 1) of the finally divided residue block 9.
The working opening 13 is dimensioned so that it can be taken out according to the final size of the residual block, and is a size necessary for taking it out in consideration of the entry and exit of a drilling machine and the like to be described later. Now it is opened. For the opening, existing techniques such as burning with a burner may be used as appropriate.

(2) Setting of division plane The residue 1 is set to a division plan plane which is a lattice shape in its planar shape, and is finally divided into small division blocks 9 by performing division along the division division plane.
Of the planes to be divided, those in the direction (lateral direction in FIG. 1) along the pull-out direction D of the residue block 9 described above are defined as the primary division plane P1, and those in the direction orthogonal to this are scheduled for secondary division. The surface is P2.
In the present embodiment, in consideration of the fact that the thickness of the residue 1 is relatively large, the division in the planar shape is set finely, and the residue 1 is divided vertically into 5 columns by four primary division planned surfaces P1. After that, division is performed on the three secondary division planned surfaces P2, and a total of 16 residual blocks 9 are formed.

  In FIG. 3, the residue 1 is set with four primary division planned planes P1 (P11 to P14) as described above, and the residue 1 is vertically divided into five columns. Of the intermediate residue block 8 divided into five rows, the central three rows are further divided into four by three secondary division planned surfaces P2 (P21 to P23). However, the two rows at both ends are only divided into two by the secondary division planned surface P22.

What is necessary is just to set suitably the division | segmentation to divide | segment, ie, arrangement | positioning of the primary division plan surface P1, and the secondary division plan surface P2. In the present embodiment, settings are made as follows.
The interval between the secondary division planned surfaces P2 (for example, indicated by a symbol L in FIG. 3) is cut for each section using a wire saw at the time of primary division (details will be described later). The cutting load on the dividing surface of each section is an integer ratio (1/1, 1/2, etc.) to the life of the wire saw. The cutting load can use the cutting area calculated | required by the product of the thickness of the residue 1 and the space | interval L of the secondary division plan surface P2.
The interval between the primary division scheduled planes P1 is set based on the blasting scale in the secondary division for the intermediate residue block 8. If the surrounding protection is relatively easy and the blasting scale can be made relatively large, the interval between the primary division planned surfaces P1 can be set large. On the other hand, when it is desired to suppress the size of blasting in the secondary division, it is desirable to set the interval of the primary division planned surface P1 small.

Note that the primary division planned planes P1 along the pull-out direction D may basically be parallel to each other, but in the present embodiment, the pull-out direction D side has a slightly wider end spread. For example, the interval between the primary division planned lines P11 and P12 is set such that the interval W1 on the front side (right side in FIG. 3) in the drawing direction D is larger than the interval W2 on the opposite side.
By doing in this way, the space | interval of a division surface spreads with the drawer | drawing-out of the residue block 9, and it can carry out smoothly without interfering with the adjacent residue block 9. FIG.

  The execution order of the steps (1) removal of the iron skin and (2) setting of the dividing surface can be arbitrarily set. That is, each of the steps (1) removal of the iron skin and (2) setting of the dividing surface may be performed first or may be performed in parallel. In order to carry out at least each of the following steps (3) to (6) of the main work, it is essential to set the respective division planned surfaces P1 and P2 for the work opening 13 and the residue 1 by removing the iron skin 12. is there.

  Once the preparation work has been completed by (1) removal of the iron skin and (2) setting of the dividing surface, (3) drilling with a drilling machine, (4) primary splitting with a wire saw, and (5) two by blasting. Next division, (6) Pull out the remaining block.

(3) Drilling with a punching machine In this embodiment, prior to cutting the residue 1, holes required for the subsequent primary division and secondary division are drilled. The holes formed in the residue 1 include a residue lower through hole 21 and a residue inner through hole 22 for inserting a wire saw used for primary division, a blasting hole 23 used for secondary division, and a drawer used for extraction. There is a service hole 24.

As shown in FIGS. 3 and 4, the residue lower through-hole 21 is drilled in the furnace bottom refractory 2 along the primary division planned surface P <b> 1 set in the residue 1. The bottom through-hole 21 is drilled as follows.
As shown in FIG. 2, a drilling machine 25 such as a boring machine is installed outside the furnace facing the working opening 13, and is leveled at an arbitrary level of the bottom refractory 2 below the residue 1. A perforated lower through hole 21 is formed. The bottom bottom through-hole 23 has a diameter that allows a wire saw used for primary division to travel without difficulty. For example, when the outer diameter of the wire saw is about 11 mm, it is desirable to set it sufficiently large as about 65 mm.
In the present embodiment, the four remaining bottom through-holes 21 may be sequentially processed by one punching machine 25, or the two punching machines 25 may work in parallel two by two. In this way, working time can be shortened by using multiple units simultaneously in parallel.

As shown in FIG. 3, the residue through-hole 22 is set at the intersection of the primary division planned surface P <b> 1 and the secondary division planned surface P <b> 2 and is drilled downward from the surface of the residue 1. As shown in FIG. 4, the through-hole 22 in the residue passes through the residue 1 and reaches the furnace bottom refractory 2, and its lower end communicates with the bottom-under-through hole 21.
As shown in FIGS. 3 and 4, the blasting holes 23 are arranged along the secondary division planned plane P2. Among these, since the intermediate residue block 8 in the intermediate part is divided into four, the blasting holes 23 are set in each of the secondary division planned surfaces P21 to P23. On the other hand, since the intermediate residue block 8 at both ends is divided into two, the blasting hole 23 is set only along the secondary division planned surface P22.
The space | interval of the hole 23 for blasting shall be 200-300 mm pitch, for example. The blasting hole 23 is for loading explosives for blasting into the residue 1, and the lower end thereof extends to the middle of the residue 1.

As shown in FIG. 3, the drawer hole 24 is disposed closer to the front side in the drawer direction D of each residual block 9 to be divided. The pull-out hole 24 is used for inserting a wire during a pull-out operation, and its lower end penetrates to the lower surface side of the residue 1. The bottom surface of the residue 1 and the furnace bottom refractory 2 are separated so that the furnace bottom refractory 2 is mainly collapsed when the residue block 9 is pulled out. For this reason, the lower end of the drawing hole 24 only needs to reach the furnace bottom refractory 2 portion when drilling.
The above-described residual through-hole 22, blasting hole 23, and extraction hole 24 are all set to a diameter of 65 mm and can be drilled using the same drilling machine.

The aforementioned perforation through-hole 22, blasting hole 23 and lead-out hole 24 are drilled as follows.
As shown in FIG. 2, a boring machine 26 such as a boring machine is introduced from the working opening 13 onto the residue 1, and the surface is drilled perpendicularly to the surface of the residue 1.
Among these, the through-hole 22 in the residue and the blasting hole 23 are arranged along the secondary division planned surfaces P21 to P23, so that the drilling machine 26 is moved along the secondary division planned surfaces P21 to P23 to perform drilling. The work of doing can be repeated. At this time, drilling by the punching machine 26 may be sequentially performed on the secondary division scheduled surfaces P21 to P23, but the drilling machines 26 are arranged on the secondary split scheduled surfaces P21 to P23, respectively, and the work is advanced in parallel. In this way, working time can be shortened by using multiple units simultaneously in parallel.

  Since the drawing holes 24 deviate from the secondary division planned surfaces P21 to P23, all the through holes 22 and the blasting holes 23 along the secondary division planned surfaces P21 to P23 are processed sequentially. Drilling may be performed by moving the punching machine 26 to the corresponding position. Or you may carry out before the process of the through-hole 22 in the residue along the secondary division plan surfaces P21-P23 and the hole 23 for blasting, and the through-hole 22 in the residue along the secondary division plan surfaces P21-P23 When the blasting hole 23 is reached in the middle of the processing, the punching hole 26 may be moved to punch the drawing hole 24.

In the present embodiment, the residual bottom through-hole 21, the residual in-hole through-hole 22, the blasting hole 23, and the drawing-out hole 24 are collectively processed in the above-described drilling step, but each hole is processed in a different procedure. May be. Each hole only needs to be processed before a necessary step, and may be processed immediately before each necessary step.
For example, since the residue lower through-hole 21 and the residue inner through-hole 22 may be used for insertion of the wire saw 27 (see FIG. 5) in the primary division step described later, the beginning of the primary division step or the middle of the primary division step You may make it process into. The blasting hole 23 only needs to be used for loading the blasting explosive 29 (see FIG. 7) in the secondary splitting process described later, so that it is processed at the beginning of the secondary splitting process or in the middle of the secondary splitting process. Also good. Furthermore, the drawing hole 24 may be processed at the beginning of the drawing process or in the middle of the drawing process because it is only necessary to insert the wire 32 (see FIG. 7) in the drawing process described later.

(4) Primary division with wire saw Once the residual bottom through-hole 21, the residual through-hole 22, the blasting hole 23 and the lead-out hole 24 have been drilled as described above, primary division with a wire saw is performed.
As shown in FIG. 5, a wire saw 27 is inserted into any residue lower through hole 21 of the residue 1 and the residue inner through hole 22 communicating therewith, and this wire saw 27 is caused to travel by a wire machine 28. Then, the residue 1 and the furnace bottom refractory 2 are cut along the primary division planned plane P <b> 1 and divided into a plurality of intermediate residue blocks 8.
If the traveling speed of the wire saw 27 is less than 20 m / sec, efficient cutting becomes difficult, and if it exceeds 30 m / sec, the wire saw 27 increases in number, so a range of 20 m / sec to 30 m / sec is preferable.

  In the present embodiment, the cutting operation by the wire saw 27 is repeated a plurality of times on one primary division planned plane P1. That is, first, the wire saw 27 is inserted into the through hole 22 in the remnant in the pulling direction D side (at the intersection with the secondary division scheduled surface P21), and in this state, the wire saw 27 is caused to travel to form one section. Cut the minutes. Next, the wire saw 27 is inserted into the next residual through-hole 22 (corresponding to the secondary division planned surface P22), and this is run to perform cutting (state shown in FIG. 5). Similarly, the wire saw 27 is repeatedly replaced to complete the cutting over the entire length of the primary division planned surface P1.

  By performing such cutting by the wire saw 27 on all of the plurality of primary division planned surfaces P11 to P14, the primary division is completed. Here, the primary division planned surfaces P11 to P14 may be sequentially processed by one wire saw 27. However, the wire saws 27 are installed on the primary division planned surfaces P11 to P14, respectively, and the work is advanced in parallel. In this way, working time can be shortened by using multiple units simultaneously in parallel.

As the wire saw 27 used in the present embodiment, an existing one can be used as appropriate.
For example, as shown in FIG. 6, a bead 27A composed of a base metal and an abrasive layer such as diamond beads is provided on a wire rope 27B, which is a stranded metal wire, and is exposed at an intermediate portion of the bead 27A. Is coated with a covering material 27C such as resin or rubber. In the present embodiment, for example, “Allied Material Product No. EWLS-255” used for dismantling and repairing subways, buildings, roads, bridges and the like can be used as the wire saw.

  From the viewpoint of preventing clogging of the diamond beads of the wire saw 27, it is preferable that the bottom bottom through-hole 21 cuts as many furnace bottom refractories 2 as possible simultaneously with the bottom 1. For this reason, it is preferable to drill at a level close to the bottom plate of the bottom of the furnace bottom refractory 2 as much as possible. When only the metal of the residue 1 is cut with the wire saw 27, the metal adheres to the beads 27 </ b> A of the wire saw 27, and clogging occurs between the beads connected to the wire, making cutting difficult. However, by cutting the furnace bottom refractory 2 at the same time, good cutting is possible without causing clogging. This is because the chips of the furnace bottom refractory 2 have no adhesion or stickiness to the beads 27A, and the non-adhesive chips are present so that the chips of the residue 1 are transferred to the diamond beads. It is considered that the beads 27A always maintain the function of the blade without adhering.

  When cutting the residue 1 with the wire saw 27, by cooling the wire saw 27, it is possible to cut the residue having a high temperature. The heat capacity of the residue 1 cooled and solidified by water injection in the furnace is large, and the temperature of the residue 1 is still high even after several days. For example, the temperature of the residue itself is normally 600 ° C. or higher even after 7 days have passed since the completion of the water injection cooling. On the other hand, since the covering material 27C of the wire saw 27 is a rubber or resin part, it generally has a heat resistant temperature of 200 ° C. or less, and since there is no heat resistance necessary for cutting the high temperature residue 1, it remains as it is. It is difficult to cut the ridge 1.

  Therefore, in order to cut the high heat residue 1 while securing the wire strength, the cutting surface where the wire saw 27 contacts the high temperature residue 1 and the range in which the wire saw 27 passes through the high temperature part are cooled. By cutting the residue 1 while removing heat by continuously supplying a cooling fluid such as water or cooling nitrogen, the residue 1 can be cut by the wire saw 27.

Specifically, as shown in FIG. 5, the leakage of the cooling fluid 27 </ b> E is suppressed by supplying the cooling fluid 27 </ b> E while closing the surface of the cutting portion of the residue 1 with the mortar 27 </ b> D after the cutting is started. 27E can be used efficiently.
Here, the cooling fluid 27E may be a liquid such as normal cooling water or a gas such as nitrogen gas. In consideration of friction cutting, it is preferable to be inactive, and in consideration of cooling efficiency, a fluid having a large heat capacity is desirable. If gas is used instead of liquid, post-processing can be said to be easier.

(5) Secondary division by blasting After the primary division by the wire saw described above, secondary division by blasting is performed.
As shown in FIG. 7, in the secondary division, the intermediate residue block 8 is loaded with a blasting explosive 29 in the blasting hole 23 previously formed, and explodes to explode the intermediate residue block 8. 8 is divided along the predetermined secondary division plane P2, thereby forming a residue block 9.
In order to minimize the influence of the surroundings due to the blasting during the secondary division, the blasting work is performed for each section.

First, the intermediate residue block 8 for performing the blasting operation is selected.
In the present embodiment, a plurality of intermediate residue blocks 8 that are close to the center of the residue 1 are sequentially selected. When the intermediate residue block 8 close to the center of the residue 1 has been divided, one of the outer residue blocks 8 is sequentially selected.
In each selected intermediate residue block 8, sections for performing blasting operations are sequentially selected.
In the present embodiment, blasting is sequentially performed from the front side (the right side in FIG. 7) in the pulling direction D among the secondary division scheduled surfaces P2 set in the intermediate residue block 8.

Specifically, first, the secondary division planned surface P21 is selected, and explosives are loaded into the blasting hole 23 formed there, and blasting is performed. As a result, the end portion of the intermediate residue block 8 is divided as the residue block 9 and can be pulled out (state shown in FIG. 7). In this state, the next secondary division planned surface P22 is selected, the blasting hole 23 formed there is loaded with explosive, blasting is performed, and the next secondary division planned surface P23 is similarly processed. As a result, the intermediate residue block 8 for one column is divided by the respective secondary division planned planes P21 to P23 to form four residue blocks 9.
In the same way, when the intermediate residue block 8 near the center (which should be divided into four parts) has been divided, the intermediate residue block 8 (which should be divided into two parts) at both ends is selected in sequence, and each center blast is blasted. Two residual blocks 9 are obtained by loading the working hole 23 with explosives and performing blasting.

As a result, five columns of intermediate residue blocks 8 formed by the primary division are secondarily divided into a total of 16 residue blocks 9.
When the residual block 9 can be divided by the secondary division by blasting as described above, these are sequentially drawn out of the furnace by a drawing step described later.

(6) Pulling out the residue block When pulling out the residue block 9 to the outside of the furnace, an unloading stand 31 extending to the work opening 13 is installed outside the furnace, and a mounting surface on the upper surface of the unloading stand 31 Is the same level as the bottom surface of the residue block 9.
Next, the wire 32 is passed through the drawing hole 24 formed in the residue block 9 on the foremost side (right side in the drawing) in the drawing direction D, and the wire 32 is pulled by the hydraulic jack 33.
As a result, a horizontal force is applied to the residue block 9 to cause a slip between the residue block 9 and the remaining furnace bottom refractory 2, and the residue block 9 is moved horizontally in the horizontal direction. Then, the residue block 9 is pulled out onto the unloading stand 31 and unloaded from the work opening 13 to the outside of the furnace.
At this time, the furnace bottom refractory 2 is not particularly cut or the like, but is peeled off from the bottom surface of the remaining iron block 9 by the pulling force of the hydraulic jack 33 at the time of pulling out, or is collapsed and automatically separated.

In order to smoothly pull out the residue block 9, a roller or the like may be appropriately installed on the upper surface of the carry-out rack 31, or a carriage may be installed and conveyed individually.
When a carriage is used on the upper surface of the unloading platform 31, the residue block 9 is jacked up, a gap is formed between the residue block 9 and the furnace bottom refractory 2, and the carriage is disposed in this space. The blocks may be jacked down and loaded on the cart, and the residue block 9 may be moved horizontally along with the cart and pulled out of the furnace.

Furthermore, not only towing by the wire 32 and the hydraulic jack 33, the residue block 9 may be driven by using a powered conveyor as the carry-out platform 31.
Also, instead of installing the unloading platform 31, a construction machine such as a dozer shovel (not shown) is introduced into the furnace from the work opening 13, and the unloading block 9 is lifted out of the furnace by unloading, The residue block 9 carried out of the furnace by a crane (not shown) may be lifted and moved to a predetermined location. By using such a construction machine such as a dozer excavator or a crane, the installation of the carry-out mount 31 and the like described above can be omitted. Moreover, since it is a construction machine, the surroundings of the blast furnace 10 can be carried out without any problem even in a situation where the scaffolding is slightly poor.

The steps of (3) drilling with a drilling machine, (4) primary splitting with a wire saw, (5) secondary splitting with blasting, and (6) withdrawing the residual block were completed in sequence. Then, the process may move to the next process, but each process may be appropriately overlapped.
For example, “(3) perforation by a drilling machine” may be continued in a part of the residue 1, while “(4) primary division by a wire saw” may be started in a part that has already been perforated.
Further, “(4) primary division by wire saw” and “(5) secondary division by blasting” may be performed simultaneously in parallel. That is, before the cutting as the intermediate residue block 8 is completed, secondary division by blasting may be performed on a section that has already been cut out on both sides with a wire saw.

  Furthermore, “(5) secondary division by blasting” and “(6) withdrawal of remaining block” may be performed in parallel. That is, the withdrawal of the residual block 9 may start after all the above-mentioned secondary division blasting is completed and divided into 16 residual blocks, but a part of it is parallel to the secondary division work. May be. That is, in the state where the division operation of the intermediate residue block 8 is performed in one column, the residue blocks 9 already divided in other columns may be sequentially drawn out in parallel with this, or the same intermediate residue may be drawn out. In the eaves block 8, for example, the residual block 9 that has been divided on the planned secondary division plane P21 may be pulled out while proceeding with the preparation for blasting of the secondary division planned plane P22 (state of FIG. 7). And the execution procedure of the drawing step may be combined as appropriate.

Or you may advance from "(4) primary division | segmentation by a wire saw" to "(6) drawer | drawing-out residual blocks" simultaneously. For example, in an arbitrary section of the residue 1, along the primary division planned plane P1 of this section, (4) primary division by a wire saw is performed, and (5) secondary division by blasting is performed immediately, and the same division is made one. Only the residue block 9 may be separated and removed by (6) pulling out the residue block. For example, the residue 1 can be completely removed by repeating such a procedure from the nearest section in the drawing direction D.
Note that (3) processing for each section including drilling by a punching machine may be performed, and in this case, all the operations are performed for each section. It is desirable to appropriately combine the overlap of each process so that optimum efficiency can be obtained in the implementation.

According to the present embodiment described above, the residue 1 is cut into a large intermediate residue block 8 using the wire saw 27, and further divided by blasting, and the residue block 9 is moved out of the furnace. By pulling out the residue, the residue can be reliably removed in a short period of time compared to the conventional method of removing the residue by dividing it by blasting alone.
That is, in the primary division process by the preceding wire saw 27, the residue 1 is cut by the wire saw 27, so that the conventional problem associated with blasting, that is, the problem of the process management of the removal work, the blast, and the scattering of small pieces of residue There are no safety issues.

In the secondary dividing step by the subsequent blasting, the blasting of the intermediate residue block 8 that has already been divided by the wire saw 27 is performed, so that the blasting can be reduced in scale and the number of times can be greatly reduced as compared with the conventional method. For this reason, the conventional problem accompanying blasting can be minimized while performing efficient division by blasting.
In particular, in the present embodiment, the intermediate residue block 8 to be secondary divided by blasting is already separated from the other intermediate residue block 8, and the direction along the division surface by the wire saw 27 (the primary division scheduled surface). The degree of freedom of movement is obtained in the direction along P1, and blasting in the same direction can be made sufficiently small.
In addition, since the intermediate residue block 8 to be secondarily divided by blasting is surrounded by other surrounding intermediate residue blocks 8, the influence of the blasting in the second division is not easily spread to the surroundings, ensuring safety. Will contribute.

  As described above, in the present embodiment, the primary division by the wire saw 27 is performed first, and then the secondary division process by blasting is performed, thereby minimizing the blasting effect while minimizing the influence of blasting as a whole. Efficient division work can be performed. As a result, it is not necessary to consider the removal depth of the residue that affects the process progress management as in the case where all of the residue 1 is subdivided by conventional blasting, and the management of the removal work is simple. In addition, since blasting can be done on a small scale, it is possible to minimize the explosion of blasts and remnants, ensuring safety and reducing temporary costs such as installing protective walls.

  In the present embodiment, the residue block 9 can be taken out smoothly by arranging the plurality of primary division planned surfaces P1 at a slight angle from parallel to each other and disposing them in a planar shape. In other words, by moving the residue block 9 to the side where the end spread is expanded, the interval between the residue blocks 9 is expanded. That is, by making it widen at the end, an allowance is formed, and there is no contact with the adjacent residual block 9, and smooth drawing can be performed.

In this embodiment, working efficiency can be improved by working in parallel with a plurality of wire saws 27 along a plurality of primary division planned surfaces P1 as compared with a case of sequentially cutting a plurality of primary division planned surfaces P1.
In this embodiment, the primary division | segmentation scheduled surface P1 can be divided | segmented into a some division by the through-hole 22 in a residue, and the cutting | disconnection by the wire saw 27 can be performed for every division. For this reason, the cutting area of the residue in each division which should be cut at once with the wire saw 27 can be adjusted.
In particular, in the present embodiment, by making adjustments such as making the cutting area of each section uniform, the work can be standardized and efficient, and cutting according to the life of the wire saw 27 as the cutting area of each section Since the cutting area is adjusted according to the load, the wire saw 27 can be used efficiently without waste.

In the present embodiment, the through-hole 22 in the residue used for the primary division and the blasting hole 23 used for the secondary division are processed using the punch 26 from the same diameter and the surface of the residue 1 respectively. The same drilling machine 26 can be shared for these processes. As a result, it is possible to omit the time for replacing the machine in the case of using individual punches for each, and it is possible to expect a significant improvement in work efficiency.
Further, by integrating the hole drilling process before the primary division process (the above-described (3) drilling by a drilling machine), the work efficiency can be improved, and the primary division planned plane P1 and the secondary division planned plane P2 can be improved. In addition, the positional relationship between the through-hole 22 in the residue and the blasting hole 23 can be clearly understood, and accurate and reliable processing can be performed.
Further, by processing the surface of the residue 1 to form the through-hole 22 in the residue and the blasting hole 23 in parallel with a plurality of punching machines 26, each hole is formed with one punching machine. Work efficiency can be improved compared to sequential machining.

In the present embodiment, when cutting the residue 1 with the wire saw 27 as the primary division, the cooling fluid is continuously supplied to the path along which the wire saw 27 travels to cool the wire saw 27. Even if the hot residue 1 is short, it can be cut reliably and the construction period can be shortened.
In the present embodiment, since the cooling fluid 27E is supplied while the surface of the cutting portion of the residue 1 is closed with the mortar 27D after the cutting is started, the leakage of the cooling fluid 27E is suppressed, and the cooling fluid 27E is efficiently supplied. Can be used.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
This embodiment basically performs the same procedure as that of the first embodiment described above. For this reason, the same code | symbol is attached | subjected about a common structure and the description is abbreviate | omitted. Hereinafter, a different part from 1st embodiment is demonstrated.

  FIG. 8 is a plan view corresponding to FIG. 1 showing the bottom of the blast furnace where residue remains, FIG. 9 is an elevation view corresponding to FIG. 2 showing the bottom residue and drilling machine, and FIG. 10 is a wire saw. FIG. 11 is a schematic diagram corresponding to FIG. 5 showing the primary division, and FIG. 11 is a schematic diagram corresponding to FIG. 7 showing the secondary division by blasting and the withdrawal of the residual block.

Also in this embodiment, first, (1) removal of the iron skin and (2) preparatory work by setting the dividing surface, then as this work (3) drilling with a punching machine, (4) primary splitting with a wire saw, (5) Secondary division by blasting, (6) Pull out residual block.
Here, while the first embodiment described above is applied to the case where the thickness of the residue 1 is relatively large, the present embodiment is applied to the case where the thickness of the residue 1 is relatively small. .
In particular, in the present embodiment, since the thickness of the residue 1 is small, the cross-sectional area in the primary division remains small even if the length of the primary division is increased, and the cross section in the primary division planned plane P1 using a wire saw remains. The area has a size corresponding to the sectional area of one section of the first embodiment described above.

8 and 9, the blast furnace 10 includes an iron shell 11 as an exterior, and a refractory material 12 such as a refractory brick is disposed inside the blast furnace 10. It remains in a flat cylindrical shape.
From this state, based on the residue removal method of the present invention, first, as a preparatory work, the following (1) removal of the iron skin and (2) setting of the dividing surface are performed.

(1) Removal of iron skin This is performed in the same manner as in the first embodiment described above.

(2) Setting of division plane In the first embodiment described above, the residue 1 is divided into five columns vertically by four primary division planes P1, and then divided by three secondary division planes P2. A total of 16 residue blocks 9 were formed.
In the present embodiment, in consideration of the fact that the thickness of the residue 1 is relatively thin, the division in the planar shape is set large, and the residue 1 is vertically arranged by two primary division planned surfaces P1 (P11, P12). After dividing into three rows, the obtained intermediate residue block 8 is divided into two by one secondary division planned plane P2, and a total of six residue blocks 9 are formed.

Here, in the present embodiment, the division along the primary division planned plane P1 is performed once by a wire saw that traverses the residue 1, and for this purpose, the primary division schedule of the intermediate residue block 8 of this embodiment is scheduled. The cross-sectional area along the plane P1 and the same cross-sectional area of the residue block 9 of the first embodiment have a corresponding width.
On the other hand, in the present embodiment, the intermediate residue block 8 is further subjected to secondary division along the planned secondary division plane P2. For this reason, the residue block 9 has a margin in the weight which becomes a problem in carrying out, and can be made into the half weight of the intermediate residue block 8 (residue block 9 of 1st Embodiment mentioned above). Accordingly, the width of the residue block 9 of this embodiment (the interval between the primary division planned surfaces P2) can be set to be about twice as large.

  Once the preparation work has been completed by (1) removal of the iron skin and (2) setting of the dividing surface, (3) drilling with a drilling machine, (4) primary splitting with a wire saw, and (5) two by blasting. Next division, (6) Pull out the remaining block.

(3) Drilling with a punching machine In this embodiment, the residual lower through-hole 21, the blasting hole 23, and the drawing hole 24 necessary for the primary and secondary divisions are used. The drilling machine 25 (see FIG. 2) is applied from the side of the residue 1 and the drilling machine 26 (see FIG. 5) is applied to the surface of the residue 1.
In the present embodiment, since the primary division is performed at a stretch across the residue 1 rather than for each section, the residue through-hole 22 is not provided.

(4) Primary division by wire saw As shown in FIG. 10, the wire saw 27 is inserted into any one of the bottom bottom through-holes 21 of the residue 1 and wound around the surface of the residue 1 from the opposite side of the residue 1. . And the wire saw 27 is made to run with the wire machine 28, the residue 1 and the furnace bottom refractory 2 are cut | disconnected along the primary division | segmentation planned surface P1, and it divides | segments into the some intermediate | middle residue block 8. FIG.

(5) Secondary division by blasting The intermediate residue block 8 is divided along the planned secondary division surface P2 by using the blasting hole 23 previously formed, whereby the residue block 9 is formed.
As a result, the three columns of intermediate residue blocks 8 formed by the primary division are secondarily divided into a total of six residue blocks 9.

(6) Pulling out the residue block As shown in FIG. 11, the residue block 9 is pulled out of the furnace by installing the unloading base 31, the wire 32 and the hydraulic jack 33 in the same manner as in the first embodiment. Do.
In the present embodiment, the allocation of the divided sections to the residue 1 is larger than that in the first embodiment, but the weight as each residue block 9 is set to be substantially the same, and the same drive as in the first embodiment is performed. Can be pulled out with load.
Thus, the residue 1 is divided and carried out of the furnace.

Also according to this embodiment described above, the residue 1 is cut into a large intermediate residue block 8 using the wire saw 27, and further divided by blasting, and the residue block 9 is pulled out of the furnace. As a result, the residue can be reliably removed in a short period of time as compared with the conventional method of removing the residue by dividing it by blasting alone.
Furthermore, in the present embodiment, since the thickness of the residue 1 is small, it is possible to increase the division of the plane shape to reduce unnecessary division work and perform the work efficiently.

In particular, in the primary division, since the entire width of the primary division planned surface P1 is cut at once by the wire saw 27, the preliminary in-residue through hole 22 used in the first embodiment can be omitted. Even in this case, since the cross-sectional area to be cut at a time with the wire saw 27 is set to correspond to the cross-sectional area of the cutting in each section of the first embodiment, the load of the wire saw 27 can be set appropriately and efficiently. Operation is possible.
Further, since the intermediate residue block 8 obtained by the primary division is further divided into the residual block 9, the intermediate residue block 8 has a weight twice that of the final residue block 9. The interval between primary divisions can be increased, and the number of primary divisions required for the residue 1 and the time for cutting work with the wire saw 27 can be reduced.

In the removal method that combines the primary division by the wire saw and the secondary division by blasting based on the present invention as described above, the removal period is shortened compared to the conventional method of dividing by blasting alone and removing it. Can do.
As a specific example, the removal of 300 tons of residue 1 took 7 days in the conventional method, but could be completed in 5 days in the present invention. Moreover, the removal of 1500 tons of residue 1 took 14 days in the conventional method, but in the present invention, it could be completed in 10 days.

Note that the present invention is not limited to the above-described embodiments, and modifications and the like within a scope in which the object of the present invention can be achieved are included in the present invention.
In the above embodiment, the two working openings 13 are formed at the position facing the blast furnace 10, but three or more openings may be provided, or one may be provided. It can set suitably as needed.
In the above embodiment, the drawing direction D is the right direction in each figure, but other directions may be selected. In this case, at least one working opening is formed in the selected pulling direction. When there are a plurality of work openings, the remaining blocks may be carried out from other work openings other than the work openings ahead of the drawing direction D.

In the embodiment, in the drilling step and the primary division step, the drilling machine or the wire saw was introduced from the work opening ahead of the pulling direction D. It may be introduced from the working opening.
In the above-described embodiment, in the step of pulling out the residual block, it is assumed that a carry-out stand is installed in the work opening ahead of the pull-out direction D, or a dozer shovel is introduced to carry out, but a dozer shovel or the like is used. In this case, the work may be carried out from a plurality of work openings in parallel. Further, it is possible to adopt a removal operation by a combination of removing a work opening from another work opening with a dozer shovel while performing a pull-out work in the pull-out direction D.

In the embodiment, the holes for inserting the wire saw are formed prior to the primary division by the wire saw, but these holes can be omitted as appropriate. For example, when the cutting for each section is not performed, the through-hole 22 in the residue may be omitted. Further, for example, when the wire saw is used without being wrapped around the residue 1, the residue lower through-hole 21 can be omitted.
Furthermore, the cutting for primary division is not limited to a wire saw, and other cutters may be used. As such a cutter, any cutter capable of cutting the residue 1 and capable of being operated by being introduced into the blast furnace 10 may be used, such as a cutter using an existing mechanical cutter or a fluid jet. May be used.

The top view which shows the furnace bottom of the blast furnace in which the residue in the first embodiment of this invention remained. The elevation view which shows the residue of the furnace bottom and drilling machine in said 1st embodiment. The top view which shows the setting of the division | segmentation planned surface with respect to the residue in said 1st embodiment. The longitudinal cross-sectional view of the residue and furnace bottom refractory which show each through-hole and blasting hole in said 1st embodiment. Schematic which shows the primary division | segmentation by the wire saw in said 1st embodiment. The schematic of the wire saw in said 1st embodiment. It is the schematic which shows the secondary division | segmentation by the blasting in said 1st embodiment, and extraction of the residue block. The top view equivalent to the said FIG. 1 which shows the furnace bottom of the blast furnace in which the residue in the second embodiment of this invention remained. The elevation view equivalent to the said FIG. 2 which shows the residue of the furnace bottom and drilling machine in said 2nd embodiment. The schematic diagram equivalent to the said FIG. 5 which shows the primary division | segmentation by the wire saw in said 2nd embodiment. FIG. 8 is a schematic view corresponding to FIG. 7, showing secondary division by blasting and pulling out residual blocks in the second embodiment. FIG. An image of the removal work of residue by conventional blasting. The top view which shows an example of the residue subdivision by blasting.

Explanation of symbols

1: Residue 2: Furnace bottom refractory 3: Slag 4: Residual body 9: Residual block 11: Iron skin 13: Work opening 21: Bottom through-hole 22: Through-hole in residual 23: Blasting Hole 24: Drawer hole 27: Wire saw P1, P11 to P14: Primary division planned surface P2, P21 to P23: Secondary division planned surface

Claims (11)

When refurbishing the blast furnace, the residue remaining on the furnace bottom refractory is divided into a plurality of longitudinally divided surfaces and removed outside the furnace as a residue block,
Cutting the residue with a cutter along the primary division planned surface set in the residue and dividing it into a plurality of residue blocks,
Blasting along a secondary division planned plane that is set to any of the divided residual blocks and intersects the primary division planned plane, and further divides the residual block into a plurality of residual blocks,
A method for removing residues, which is characterized by sequentially drawing these residue blocks out of the furnace. In the removal method of the residue of Claim 1,
A plurality of primary splitting planes are set for the residue, and these primary splitting planes are divided into a plurality of dividing lines parallel to the pulling direction of the residual block, or a plurality of dividing lines spreading in the pulling direction. The removal method of the remnants characterized by being set along. In the removal method of the residue of Claim 1 or Claim 2,
A plurality of the primary division planned surfaces are set in the residue,
A method for removing a residue, comprising cutting in parallel with a plurality of cutters along an arbitrary plurality of primary division planned surfaces. In the removal method of the residue in any one of Claims 1-3,
Using a wire saw as the cutter,
A bottom bottom through-hole is drilled in the furnace bottom refractory along the primary division planned surface, a wire saw is inserted through the bottom bottom through-hole, and the wire saw is cut along the primary division planned surface. A method for removing residue, comprising running, cutting the residue and the bottom refractory and dividing it into a plurality of residue blocks. In the removal method of the residue of Claim 4,
When cutting the residue with the wire saw, drilling a through hole in the residue that communicates with the lower residue through hole from the surface of the residue using a punching machine along the primary division planned surface,
By inserting the wire saw into the through hole in the residue and the through hole under the residue, the division of the residue along the primary division planned surface is divided into a plurality of sections divided by the through hole in the residue. A method for removing a residue characterized by performing. In the removal method of the residue of Claim 4 or Claim 5,
The division by the blasting is to pierce a blasting hole along the secondary division planned surface first, load a gunpowder in this blasting hole, and ignite this gunpowder,
The method of removing residue, wherein the blasting hole is drilled from a surface of the residue to a predetermined depth using a punch. In the removal method of the residue of Claim 6,
The method for removing a residue, wherein the through hole in the residue and the blasting hole are sequentially processed by the same drilling machine. In the removal method of the residue of Claim 6,
A method for removing a residue, wherein the residue through hole and the blasting hole are sequentially processed in parallel by a plurality of punching machines. In the removal method of the residue in any one of Claims 4-8,
A method for removing residues, wherein when cutting the residue with the wire saw, a cooling fluid is continuously supplied to a path along which the wire saw travels and the wire saw is cut while being cooled. In the removal method of the residue in any one of Claims 1-9,
When the residue block is pulled out of the furnace, the level of the residue block carry-out carriage or the residue block carry-out platform is adjusted to the same level as the bottom surface of the residue block to be drawn out and installed next to the residue block. ,
A horizontal force is applied to the residue block to cause slippage between the residue block and the remaining furnace bottom refractory, and the residue block is moved horizontally in the horizontal direction and pulled out to draw out the residue block or residue block. A method for removing residues, characterized in that it is loaded onto a carrying rack. In the removal method of the residue in any one of Claims 1-9,
When pulling out the residue block outside the furnace,
Jack up the remaining block,
A moving device for loading the residue block in a space formed between the residue block and the remaining furnace bottom refractory is disposed at the bottom of the residue block,
Jack the remaining blocks down and load them on the mobile device.
A method for removing a residue, wherein a moving device loaded with the residue block is horizontally moved and the residue block is pulled out of the furnace.

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