JP2009062561A - Method for dismantling furnace bottom part of blast furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an universal dismantling method with which a blast furnace including the large blast furnace can be dismantled in a shorter term than heretofore. <P>SOLUTION: This dismantling method is performed as the followings, that for cutting off and carrying out the bottom part in the blast furnace, during operating the blast furnace, a plurality of cutting-off sections are set to a basic concrete at the bottom part in the pulling-out direction, and horizontal holes 41 parallel to the pulling-out direction, are bored and in a part of the cutting-off sections, the basic concrete is cut off with a wire-saw at a prescribed thickness to form gap parts 56, and in these gap parts, side-shifting member 44 and furnace-load supporting members 51a,51b, are arranged. Then, in the other cutting-off sections, the basic concrete is cut off with the wire-saw in the horizontal direction and in this way, the bottom part of the blast furnace and the basic concrete are made to separate with the horizontal cutting-off plane, and further, during repairing term after blowing off the blast furnace, the upper part mantel is separated from the bottom part of the blast furnace, and after lifting up and fixing it, the horizontal force is given to the bottom part of the blast furnace and the bottom part is carried out to the outside. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for disassembling a blast furnace bottom for dismantling the bottom of a furnace in a short time in blast furnace renovation.

  Conventionally, when dismantling the blast furnace bottom and carrying it out of the system in blast furnace refurbishment, the dismantling work is performed after discharging hot metal, slag, and the like remaining at the bottom of the blast furnace as much as possible. In such dismantling work, several methods for shortening the dismantling work period have been proposed so far (for example, see Patent Documents 1 and 2).

  In Patent Document 1, after blowing off the 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, and the furnace body of the blast furnace is positioned higher than the solidified layer. The furnace body above the cutting position is suspended from the blast furnace furnace with a jack or the like and fixed, and then the furnace core below the cutting position is removed over the entire circumference of the furnace body. A method for dismantling the bottom of the blast furnace furnace is disclosed, in which the solidified layer and the brick at the bottom of the furnace are integrally drawn out of the furnace.

  According to this dismantling method, the demolition work period can be shortened compared with the conventional method in which the residue and carbon bricks are divided by blasting and carried out of the furnace, but this dismantling method is performed at the bottom of the blast furnace furnace before blowing. In this dismantling method, a temporary opening is provided, the hot metal and slag remaining in the hearth are discharged from the opening, and then the residue and the furnace body are cooled by pouring water from the upper part of the furnace body. Therefore, the amount of work for unloading the iron skin around the entire circumference of the furnace body, the in-furnace solidified material layer, and the furnace bottom brick as one body is extremely large, and the overall dismantling period is not necessarily shortened.

  Also, 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. Or, it cannot be supported by pushing it up with a jack, and therefore, it is not possible to arrange a drawer rail, roller member, etc. under the cut bottom furnace brick, and the blast furnace bottom can be pulled out. There is a problem of becoming unstable.

  In consideration of the above problems, the present applicant, in Patent Document 2, divided into a plurality of cutting sections in advance into the basic concrete below the floor beam provided in the lower part of the blast furnace body during operation before blast furnace blowing. Set the horizontal cutting section and maintain the blast furnace main body in an upright state, cut each cutting section with a wire saw, and (i) secure the peelability to the part cut with the wire saw. The horizontal cutting part is sequentially cut with a wire saw while supporting the load of the blast furnace body with filling and hardening grout material, or (ii) filling with sand or iron particles and supporting the load of the blast furnace body. We proposed a method for dismantling the bottom of the blast furnace.

  According to this dismantling method, the bottom of the blast furnace consisting of a joint beam and a bottom mantle that are integrally coupled is lifted with a jack or the like, separated from the basic concrete, and a lateral movement means is disposed in the separation space to provide a blast furnace The bottom of the 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 blast furnace bottom, the blast furnace bottom can be dismantled and carried out in a unified work procedure while containing the solidified residue. The dismantling period can be greatly shortened.

  In the dismantling method, rail members, carriages, rollers, pneumatic levitation devices, etc. are disclosed as the lateral movement means for carrying out the bottom of the blast furnace furnace. However, these lateral movement means are disclosed in the separation space. In order to arrange them, it is necessary to secure a separation space having a height corresponding to “the bending of the blast furnace furnace + the height of the lateral movement means + the allowance (such as a work space for taking in the lateral movement means)”.

  That is, the dismantling method increases the work load such as jacking up of the bottom of the furnace and mounting the bracket for jacking up in order to secure a separation space in consideration of the “bending of the blast furnace furnace”. I have a problem.

  Therefore, in view of the above problems, the present applicant minimizes the separation space in which the lateral movement means for carrying out the furnace bottom portion is inserted and arranged in Patent Document 3, and does not perform jack-up work. A blast furnace body removal method that can shorten the work period was proposed.

  Moreover, in patent document 4, in the blast furnace body, the upper part of the range to be removed is cut off, and the underlying concrete or the base grout below the range to be removed is cut with a wire saw, and is integrally formed with a floor beam and a furnace bottom mantel. A blast furnace where the furnace body is raised and a “sliding member” is arranged as a lateral movement means for carrying out the bottom of the furnace, and the furnace body is lowered onto the lateral movement means and moved laterally to move outside the furnace body. Disclosed how to remove the body.

  However, when dismantling and removing a large blast furnace, for example, a large blast furnace of 5000 to 6000 m 3, according to the conventional method, the residue of about 4000 tons or more must be removed from the bottom of the furnace, so that the dismantling period is inevitable Prolonged. In addition, when the above removal method is applied, the amount of bending of the blast furnace furnace body is large, so there is a limit to minimizing the separation space for placing the lateral movement means for carrying out the bottom of the furnace, reducing the load of jack-up work. Without dismantling, the dismantling period will be prolonged.

  Furthermore, when the above removal method is applied to the dismantling and removal of a large blast furnace, equipment and facilities of a required scale are required to lift the furnace bottom of about 4000 t or more, and it is necessary to carry out the blast furnace bottom. Requires lateral movement means of strength and scale.

  Thus, when a large blast furnace is dismantled, the equipment and facilities required for the dismantling work are necessarily increased in size and the dismantling method is complicated, and the dismantling work period is prolonged. That is, in dismantling and removing large blast furnaces, there is currently no suitable dismantling method that can dismantle and remove the furnace body in a short period of time.

JP-A-10-96005 Japanese Patent No. 3684201 JP 2006-183105 A JP 2006-283183 A

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

  The present inventor lifts the blast furnace bottom or pushes it up with a jack in order to arrange the lateral movement means at the bottom of the blast furnace bottom, resulting in a complicated disassembly procedure and a long dismantling period. In view of this, the demolition technique that can arrange the lateral movement means on the foundation concrete or base grout at the bottom of the blast furnace bottom without suspending the blast furnace bottom or pushing it up with a jack has been intensively studied.

As a result, the basic 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 if the lateral movement means is placed directly in the gap, the bottom of the blast furnace bottom It was found that large-scale equipment and facilities required for lifting and jacking up are not required, the preparation for unloading is simplified, and the dismantling period of the bottom of the blast furnace furnace can be greatly shortened.
Furthermore, the above-described arrangement of the lateral movement means does not have to be performed for all the cutting sections in the horizontal cross-sectional shape of the foundation, and the lateral movement means is arranged in some cutting sections to support the furnace load. The other cutting sections have been found to be able to simplify the work man-hours and further shorten the work period by performing only horizontal cutting.

The present invention is a method for disassembling a blast furnace bottom part by separating and carrying out the blast furnace bottom part from basic concrete or base grout located below the blast furnace bottom part, and the following steps 1 to 5 are performed in advance during the operation of the blast furnace. After that, the following step 6 is performed during the repair period after the blast furnace is blown off.
Step 1: A plurality of cutting sections parallel to the drawing direction of the blast furnace bottom are set on the horizontal cutting plane set in the basic 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 saw wire into the adjacent horizontal hole, cut the basic concrete of the cutting section along the upper horizontal plane and the lower horizontal plane maintaining the required height, and between the upper and lower horizontal cut planes A certain cut foundation concrete or base grout is discharged to form a gap parallel to the drawing direction, and a lateral movement member for carrying out the blast furnace bottom is disposed in the gap, and the gap is placed in the gap. A furnace body load support member for supporting the furnace body load is provided in a space between the upper surface of the laterally moving member and the upper horizontal cut surface.
Step 4: A wire saw wire is inserted into the adjacent horizontal hole, and the basic concrete of the cutting section is cut along a horizontal plane that maintains a required height.
Step 5: Repeat Step 3 for any one of the cutting sections, and repeat Step 4 for the other cutting sections, so that the blast furnace bottom and the foundation concrete or base grout are horizontally cut. Separate at.
Step 6: After separating the upper mantel from the furnace bottom, it is lifted, a horizontal force is applied to the furnace bottom, and it is carried out of the system.

  According to the present invention, since all the lateral movement means for laterally moving the furnace bottom can be attached during the operation before the blast furnace blowing, it is performed after the blowing that is disclosed in the patent document. The number of installation days of the lateral movement means can be shortened.

That is, during operation of the blast furnace, a gap is formed in the basic 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 arranged, and the lateral gap is formed in the gap. The moving means is taken in, and the load at the top of the cutting is supported by the lateral 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 can be reduced.
In particular, in the present invention, the arrangement of the lateral movement means is limited to a part of the cutting sections in the horizontal cross-sectional shape of the foundation, and the other cutting sections perform only horizontal cutting. Therefore, the number of horizontal cutting points can be greatly reduced, and the number of work steps can be simplified and the work period can be further shortened.

  Further, according to the present invention, there is no need for a large-scale apparatus / equipment for lifting or jacking up the bottom of the blast furnace furnace, which is a heavy object, and the lateral movement means including the lateral movement member and the furnace body load support member is provided. Since it suffices to arrange it 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.

Furthermore, according to the present invention, since there is no need to lift the blast furnace bottom, which is a heavy object, a blast furnace bottom where a rigid member such as a spread beam is not laid on the furnace bottom (since there is no rigid member, lifting or jacking 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, it is preferable that the step 3 and the step 4 are alternately adjacent to the cutting section.
In the present invention, the cutting section having the lateral movement means formed in Step 3 and the cutting section having the lateral movement means formed in Step 4 are alternately arranged, and there is no lateral movement means. The load of the cutting section can also be shared by the lateral movement means of the adjacent cutting section.

In the present invention, in the step 4, it is desirable to inject a friction modifier into the horizontal surface.
The friction modifier is preferably a sphere or an oval sphere having a maximum diameter of 10 mm or less, preferably a maximum diameter of 1 to 4 mm, and having a breaking strength with a maximum diameter of 1 mm and a load of 0.1 kg or more. As the spherical particles, iron balls, ceramic balls, resin balls, or glass balls can be used.

In the present invention, in the cutting section without the lateral movement means formed in the step 4, even when the upper and lower surfaces of the cut surface come into contact with each other, it is generated during the lateral movement of the step 6 by the friction modifier. Unnecessary resistance can be avoided.
By using such a friction modifier, it is also possible to increase the ratio of the cutting section without the lateral movement means in step 3.

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 configured by standing a blast furnace body 13 on a floor beam 12 laid on a foundation concrete 11.

A plurality of exhaust pipes 15 are provided in the upper part of the blast furnace 10, and the blast furnace 10 and the exhaust pipe 15 are supported by a furnace body 14 including support columns 22 erected at four locations around the blast furnace 10.
An annular tube 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 that conveys the charging device 19 is provided at the upper end part, and a furnace is provided at the intermediate part. A temporary extension deck 18 is provided for performing maintenance inspection and dismantling work on the top facility.

A beam or a 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 disposed at any level of the furnace body rod capable of supporting the blast furnace.
The outer side of the blast furnace body 13 is covered with an iron skin 29, and a large number of stave coolers 30 are arranged on the inner side.

After the blast furnace 10 is blown off, an unmelted coke layer and molten iron or slag are solidified into a solid kneaded mass 32 inside the bottom brick layer 31 inside the lower portion of the blast furnace main body 13. A residue 33 that has been cooled and solidified remains below the lump 32.
The blast furnace body 13 is composed of an upper mantel 34 on the upper side and a lower mantle 35 on the lower side (containing residual bricks and residue 33).
In the present invention, the bottom beam 36 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 large number of H-shaped steels 23 arranged side by side and a furnace bottom plate 26 disposed on the top thereof.
A cooling pipe 24 is disposed between 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.

Hereinafter, the procedure of the blast furnace bottom dismantling method (the present invention method) according to the present invention will be described.
The present invention is basically characterized in that the following steps 1 to 5 are performed in advance during operation of the blast furnace, and then step 6 is performed during the repair period after the blast furnace is blown off.

Step 1: A plurality of cutting sections parallel to the drawing direction of the bottom of the furnace bottom are set on the horizontal cutting plane set in the basic concrete or base grout located below the bottom of the blast furnace furnace to be carried out.
Step 2: A horizontal hole parallel to the drawing direction is drilled in the basic concrete or base grout at the boundary of the cutting section.
Step 3: Insert a wire saw wire into the adjacent horizontal hole, cut the basic concrete of the cutting section along the upper horizontal plane and the lower horizontal plane maintaining the required height, and between the upper and lower horizontal cut planes A certain cut foundation concrete or base grout is discharged to form a gap portion parallel to the drawing direction, and a laterally moving member for unloading the furnace bottom portion is arranged in the gap portion and arranged in the gap portion. A furnace body load support member for supporting the furnace body load is provided in a gap between the upper surface of the laterally moved member and the upper horizontal cut surface.

Step 4: A wire saw wire is inserted into the adjacent horizontal hole, and the basic concrete of the cutting section is cut along a horizontal plane that maintains a required height.
Step 5: Repeat Step 3 for any one of the cutting sections, and repeat Step 4 for the other cutting sections, so that the blast furnace bottom and the foundation concrete or base grout are horizontally cut. Separate at.
Step 6: After separating the upper mantel from the furnace bottom, it is lifted, a horizontal force is applied to the furnace bottom, and it is carried out of the system.

  Hereinafter, the above-described steps 1 to 5 are referred to as a furnace bottom portion separation step, and step 6 is referred to as a furnace bottom portion carry-out step, which will be described with reference to the drawings.

(Furnace bottom cutting process)
In FIG. 2B, a horizontal cutting portion 49 is set in advance in the basic concrete 11 below the floor beam 12 of the furnace bottom portion 36, and then a plurality of cutting portions 49 are parallel to the drawing direction of the furnace bottom portion 36. A cutting section is set (step 1).
FIG. 3 shows one mode of the set cutting section.

  In FIG. 3, in the horizontal cutting part 49 provided in the foundation concrete 11, ten cutting sections 68a-68j (foundation concrete 11 (or base grout)) parallel to the direction (left-right direction) which moves a furnace bottom part horizontally are made into the wire saw 70. (Range to be cut by the wires 70a to 70j).

  The width of the cutting section is appropriately set in consideration of the size and weight of the furnace bottom. 450-5000 mm is preferable. 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.

  Using a punching machine (not shown), the cutting section 68a and the end boundary 69a, the cutting sections 68a to 68j, the boundary sections 69b to 69j, and the cutting section 68j and the end boundary 69k have a predetermined diameter. A horizontal hole is drilled (step 2). The diameter of the horizontal hole is set as appropriate in consideration of the ease of the subsequent cutting operation with a wire saw and securing a height sufficient to insert and arrange the lateral movement means in the gap formed by this cutting. However, 60-200 mm is preferable.

  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. Moreover, when the diameter exceeds 200 mm, it is difficult to drill a horizontal hole of a long distance (for example, about 20 m), and it takes a lot of time for the drilling work with a drilling machine, and it is functionally horizontal. There is no point in increasing the diameter of the hole.

  The interval between adjacent horizontal holes is appropriately set in consideration of the size and weight of the furnace bottom, the area of the foundation concrete, and the like, but is preferably 0.45 to 5 m. If the distance between adjacent horizontal holes is less than 0.45 m, the resistance at the folded portion when the wire saw 70 rotates is large, and the foundation concrete cannot be cut. If the distance between adjacent horizontal holes exceeds 5 m, It becomes difficult to cut the foundation concrete horizontally.

  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 is moved laterally In this case, the frictional resistance also increases, and it becomes extremely difficult to carry out the bottom of the blast furnace furnace. For example, in the case of a furnace bottom having a weight exceeding 4000 t, it cannot be carried out.

  In addition, the adjacent space | interval of a horizontal hole does not need to be constant. The dimensions may be appropriately changed in consideration of the size of the bottom of the blast furnace furnace and the area of the basic concrete (or base grout).

  The wires 70a to 70j of the wire saw 70 are inserted into the horizontal holes drilled in the respective boundary portions, and the basic concrete remaining in the cutting sections 68a to 68j is arranged by inserting 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 height interval (step 3), and discharge the basic concrete of the cut-out portion to form the void 56 (see FIG. 2B). Form (step 4).

  In the horizontal cutting part 49, the two-surface cutting of the upper horizontal plane 47 and the lower horizontal plane 48 is applied only to the cutting section in which the lateral movement means is arranged. For the other cutting sections, one-side cutting is performed by any one of the upper horizontal plane 47 and the lower horizontal plane 48 described above or an arbitrary horizontal plane at a height between the horizontal planes 47 and 48.

  In the present embodiment, every other cutting section where the lateral movement means is arranged and every other cutting section where no horizontal movement means are arranged are arranged adjacent to each other. That is, the cutting sections 68a, 68c, 68e, 68g, and 68i in FIGS. 3 and 4 perform two-face cutting to arrange the lateral movement means (see FIG. 5), and the cutting sections 68b, 68d, 68f, 68h, and 68j. Since the lateral movement means is not arranged, it is cut on one side (see FIG. 6).

FIG. 5 shows an enlarged cross section of the cutting sections 68a, 68c, 68e, 68g, 68i to which the step 3 is applied.
In this cutting section, a two-sided cutting and lateral movement means 53 (configured with a floor plate 44, a sliding plate 45, an HPA 51a, and an α material 51b, which will be described later) is performed in Step 3.
In the two-sided cutting method, in the removal method described in Patent Document 4, after applying the 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 portion 36 is set. The horizontal movement means (for example, a sliding member) is arranged on the cut surface 48 by lifting, but in the method of the present invention, as described later, it is not necessary to fill the grout material, and it is also necessary to lift the furnace bottom 36. Instead, the lateral movement means 53 is arranged in the gap 56.

  When cutting the foundation concrete of a large blast furnace along the upper horizontal plane and the lower horizontal plane, arrange the wire guide member that guides the movement of the wire saw 70 in the horizontal hole, so that the upper and lower cut surfaces do not wave in an uneven shape, Or it is preferable to cut | disconnect so that the space | interval of an upper and lower cut surface may not change.

  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 become horizontal surfaces while maintaining a predetermined height interval. . As a result, the resistance at the foundation concrete cut surface when carrying out the blast furnace bottom is reduced, and the blast furnace bottom can be smoothly carried out.

FIG. 6 shows an enlarged cross section of the cutting sections 68b, 68d, 68f, 68h, 68j to which the step 4 is applied.
In this cutting section, only one side cutting is performed as step 4.
The same procedure as the two-sided cutting described above can be adopted for the one-sided cutting, but only one side is cut at an arbitrary height between the horizontal cutting surfaces 47 and 48, and the resulting gap 56A is moved laterally. The means 53 is not installed, and the height of the gap 56A may be low.

By alternately applying any of the above-described step 3 or step 4 to each of the cutting sections 68a to 68j (see FIG. 3 and FIG. 4) set to the basic concrete at the bottom of the blast furnace furnace, the horizontal cutting portion 49 is applied. (Step 5), and the lateral movement means 53 is intermittently disposed in every other cutting section.
At this time, drilling of horizontal holes at the boundary portions 69a to 69k of the cutting sections and cutting of the basic concrete of the cutting sections 68a to 68j are repeatedly performed (step 2, step 3, and step 4). May be sequentially performed from one direction (for example, from 68a to 68j), but it is preferable that the non-adjacent cutting sections are regularly selected and continuously performed.

  For example, as shown in FIG. 4, first, the cutting section of 68e is cut (1 in the figure), then the cutting sections of 68a and 68j are cut simultaneously (2 in the figure), and then cutting of 68c and 68g is performed. The sections are cut simultaneously (3 in the figure), and finally the remaining cut sections are cut simultaneously (4 in the figure).

As described above, when the drilling / cutting operation is regularly selected and performed, it is possible to suppress the uneven load distribution in the foundation concrete, so that the furnace body load is applied to the lateral movement means 53 almost uniformly, and the bottom of the blast furnace furnace The unloading work will be facilitated.
In addition, the cutting sections 4 in the figure are alternately arranged between the sections 1 to 3 in the figure, and the cutting sections 1 to 3 in the figure have the arrangement of the lateral movement means 53 by two-sided cutting (process) 3) In the figure, the cutting section 4 is only one side cutting (step 4), and the work content can be clarified.

  As described above, after step 2, in step 3, the lateral movement means 53 is disposed in the gap portion 56 (see FIG. 2B) after the above-described two-side cutting. Then, in step 4, one-side cutting is performed on the remaining cutting section. As a result, the entire horizontal cutting portion 49 set in the basic concrete at the bottom of the blast furnace furnace is cut horizontally, and the lateral movement means 53 is arranged in every other cutting section.

In the present embodiment, as the lateral movement means 53, a configuration including lateral movement members (44, 46) and furnace body load support members (51a, 51b) described below can be used.
In the lateral movement means 53, 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.
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 (high pack anchor, fiber bag filled with mortar), HPA and α material ( Combination arrangement with garnet, spherical particles with small particle diameter, combination of one or more kinds of mortar), arrangement of α material only.

In the case where a single sheet is used as the lateral movement member, it is preferable to use only the α material 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, and α material alone can be selected as the furnace body load support member.

When HPA is used as the furnace body load support member, it is preferable to take measures regarding its fluidity when filling mortar in the HPA.
Specifically, coating the inner surface of HPA (Countermeasure A), immersing HPA in water before filling the mortar (Countermeasure B), and there is no sudden throttling in the mortar flow path. Such pipes (Countermeasure C) can be mentioned.

According to the measure A, the flow of the mortar in the HPA becomes smooth. When there is no coating, the mortar sticks and stays in the HPA, or a lump is generated, and the mortar cannot be smoothly filled. However, the countermeasure A can avoid mortar retention or lump generation, and enables smooth filling into the HPA.
According to the measure B, moisture is hardly separated from the mortar filled in the HPA. When water is separated from the mortar introduced into the HPA, the mortar stays or generates lumps in the HPA, but these can be suppressed by the measure B and smooth filling can be performed.
Regarding Measure C, if there is a portion where the flow path area is suddenly narrowed in piping or the like leading to the HPA, mortar stays easily. In such a part, for example, by using a guide pipe having a loose conical shape, it is possible to eliminate a sudden throttling and prevent the mortar from staying.
These measures will be described in detail again in the embodiment.

  In FIG. 5, one sliding plate 45 is placed on one floor plate 44 as a laterally moving member, and a combination of an HPA 51a and an α material 51b is disposed thereon as a furnace body load supporting member. The aspect of the horizontal movement means 53 which did 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.

In the lateral movement member, if the material of the floor plate and the sliding plate is the same type, slip resistance due to galling is likely to occur between the two plates during lateral movement of the blast furnace bottom, thereby requiring a large horizontal force during lateral movement. . Accordingly, the two plates are preferably made of different materials.
As an application example, 1. Base plate SS material, sliding plate SUS material, A multi-layer structure composed of a floor plate SS material, a sliding plate SUS material (lower surface) + SS material (upper surface) can be mentioned.
In this case, in both cases, the sliding plate SUS material is worn between the sliding plate SUS material and the sliding plate SUS material that slides with each other when the bottom of the blast furnace furnace is laterally moved. Become.
In addition, by making the sliding plate a multi-layered multi-layer structure made 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.

  A floor plate laid on the bottom surface of a horizontal hole having a concavo-convex surface formed by a wire of a wire saw locally receives a furnace body load via a furnace body load support member. Therefore, the thickness of the floorboard is set so that the floorboard can secure sufficient strength 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.

  In the configuration of FIG. 5, one floor plate and one sliding plate are used. However, the lateral movement member may be configured by arranging two or more sliding plates on one floor plate. In this case, if a groove is provided on the upper surface of the floor plate and the groove is filled with a lubricant from outside the system, the sliding between the floor plate and the sliding plate becomes smoother.

  On the other hand, only a single floor plate may be used as the lateral movement member. However, in this case, if the HAP alone or the HAP + α material is placed on the floor plate as the furnace body load support member, the HAP may be damaged during the lateral movement. Therefore, when only one sheet is used as the lateral movement member, HAP alone and HAP + α material are not suitable as furnace body load support members, and it is desirable to use only α material.

  When the α material is used as the furnace body load support member, it is preferable that the α material is filled in the gap between the top surface of the floor plate and the cut surface so as to be in a consolidated state. However, in this case, it is easy to arrange the lateral movement member and the furnace load support member in the gap, but since only a small lubricating action can be obtained, the indexing force must be increased when the blast furnace bottom is laterally moved. Therefore, an indexing device having a large capacity is required.

  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 the case where the α material is used. HAP alone, HAP + α material, and α material can all be used. Further, in this case, the frictional resistance value is small, and the indexing force is very small when the blast furnace bottom is moved laterally.

  As the spherical particles having a small particle diameter as one kind of the α material, spherical or elliptical iron balls having a maximum diameter of 10 mm or less are preferable. Moreover, it is preferable to use a garnet instead of the spherical particles.

As described above, in the lateral movement means in which the floor plate and the sliding plate are overlapped as the lateral movement member, a lubricant is filled between the floor plate and the sliding plate, thereby smoothly sliding the sliding plate with respect to the floor plate. It is preferable.
In FIG. 5, a groove (not shown) is formed on the surface of the lateral movement member (the upper surface of the floor plate 44), a supply path 54 communicating with the groove from the outside is formed, and the floor board 44 is used using the supply path 54. A lubricant 55 (for example, oil) may be supplied between the sliding plate and the sliding plate by a pump. When the lubricant is filled between the floor plate and the sliding plate, the work for carrying out the bottom of the blast furnace furnace can be performed more smoothly, safely and quickly.

7A to 7C show various aspects of the furnace body load support member in 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 aspect in which the α material 51b is filled between the HPA 51a and the HPA 51a.
FIG. 7C shows an embodiment using only HPA 51a.
As described above, as the furnace body load support member, any one or two of α material and HPA may be used in combination.

  Which furnace load support member is selected is appropriately determined depending on the construction difficulty level. For example, if the gap between the floor plate and the upper surface of the gap is small, and mortar and HPA cannot be placed and installed on the lateral movement member as the furnace load support member, garnet or spherical particles with a small particle size are used. It is preferable to use it.

(Furnace bottom part unloading process)
As described above, the two-sided cutting in Step 3 and the arrangement of the lateral movement means 53 and the one-sided cutting in Step 4 are repeated for all cutting sections, and Steps 3 and 4 are completed over the entire surface of the horizontal cutting portion 49 The upper mantel 34 separated from the blast furnace bottom is lifted, and the blast furnace bottom 36 is carried out of the furnace body 14 (outside the system) (step 6).

FIG. 8 shows how the blast furnace bottom is carried out.
The upper mantel is separated as follows, for example.

  When Steps 3 and 4 are completed for the entire area of the horizontal cutting portion 49, the blast furnace 10 is blown off, and the suspension brackets 52 are welded to the upper part or the middle of the iron shell 29 of the blast furnace body 13 respectively. While fixing, a plurality of center hole jacks 50 are attached to the furnace body 14, and the blast furnace 10 is suspended and supported on the furnace body 14 via the suspension bracket 52 and the center pole jack 50.

Next, an intermediate part of the blast furnace body 13, for example, a part below the level of the annular tube 16 of the blast furnace furnace body 13 (cut line C1 in FIG. 8) and one or more parts of the intermediate part of the blast furnace body 13 (FIG. 8). The cutting line C2) is cut substantially 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 shell 14 by the suspension bracket 52 and the center hole jack 50, respectively.
After holding the upper mantel 34 in the furnace body 14 in this manner, first, the blast furnace furnace bottom portion 36 including the furnace body mantel 35 is carried out to the outside (outside the system) of the furnace body 14.
Subsequently, the center hole jack 50 for suspending the lowermost block of the upper mantel 34 is operated, and the block is lowered onto an unloading device (for example, a roller, a sliding plate, a carriage, etc.) installed on the foundation. It is carried out of the furnace body in the same manner as the bottom portion 36.
Similarly, each block of the upper mantel 34 is sequentially carried out from the lower one, and all of the upper mantel 34 is carried out.
Thus, the blast furnace body 13 is carried out of the furnace body.

The furnace top equipment such as the charging device 19 is disassembled and removed using the furnace top outrigger crane 17 and the temporary extension deck 18.
In carrying out these, a construction machine such as a dolly or a crane truck may be used, a semi-fixed facility such as a conveyor may be installed, or a plurality of these may be used in combination.

  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 the side surface aspect, and FIG. 10 shows the planar aspect.

  Adjacent to the basic concrete 11, a heavy material transporting carriage 57 is installed, and on the upper surface of the heavy material transporting car 57, a floor plate 44 disposed in a gap portion of the basic concrete 11 is extended and disposed. In this state, the blast furnace bottom 36 is laterally moved to the upper surface of the heavy material transporting carriage 57 by pulling the pulling wire 59 having one end fastened to the bracket 60 fixed to the blast furnace bottom 36 by the jack 58.

At this time, it is necessary to prevent a side slip in the index direction of the blast furnace bottom portion 36. In order to prevent this side slip reliably, for example, the lateral movement guide member 61 shown in FIG. You may arrange in a 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 skidding in the index direction.
Further, as another method for preventing side slip, a guide rail may be installed outside the furnace bottom mantel to prevent side slip.

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

(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 in the implementation. Modifications and the like within a range in which the object can be achieved are included in the present invention.

In the above-described embodiment, in the cutting section to which the step 4 is applied (the lateral movement means is not installed), the single-side cutting is performed, but the friction modifier may be injected into the gap formed by the single-side cutting. Good.
In FIG. 11, the cutting sections 68b, 68d, 68f, 68h, and 68j are subjected to a one-side cutting as step 4, and then a friction modifier is injected.

The one-surface cutting is performed in the same manner as in the embodiment of FIG. 6, and a similar gap 56A is formed. The gap 56A is filled with a friction modifier 56B.
The friction modifier 56B is preferably a sphere or an oval sphere having a maximum diameter of 10 mm or less, preferably a maximum diameter of 1 to 4 mm, and having a breaking strength with a maximum diameter of 1 mm and capable of withstanding a load of 0.1 kg or more. As the spherical particles, iron balls, ceramic balls, resin balls, or glass balls can be used.

  In filling the friction modifier 56B, it is possible to adopt means such as supplying the friction modifier 56B by pumping into the gap 56A from one side of the furnace bottom 36. Document proposed by the present applicant: Japanese Patent Application Laid-Open No. 2006-183105 discloses a technique related to injection of spherical particles, which can be easily implemented by those skilled in the art by referring to the same document and the like. .

In this embodiment, in the cutting section without the lateral movement means formed in the step 4, even when the upper and lower surfaces of the cut surface come into contact with each other, the friction modifier 56B performs the lateral movement in the step 6. It is possible to avoid unnecessary resistance that occurs in
By using such a friction modifier 56B, it is also possible to increase the ratio of the cutting section without the lateral movement means in step 3.

  In the embodiment described above, the horizontal cutting 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 in the cutting section to which the step 3 is applied (the lateral movement means is installed). In order to obtain a space (height) between the horizontal plane 47 and the lower horizontal plane 48, three plane cutting or four or more plane cutting may be performed.

  INDUSTRIAL APPLICABILITY The present invention can be used as a method for dismantling the blast furnace bottom for dismantling the bottom of the furnace in a short time during blast furnace renovation.

It is a figure which shows the one aspect | mode of the blast furnace and furnace main body which concerns on one Embodiment of this invention. It is sectional drawing which shows the furnace bottom part of the blast furnace in the said embodiment. It is sectional drawing to which the 2B part of the said FIG. 2A was expanded. It is a figure which shows the one aspect | mode which set the horizontal cutting part to the blast furnace bottom part in the said embodiment, and set the some cutting division to this cutting part. It is a figure which shows an example in the case of cut | disconnecting a cutting | disconnection division | segmentation in the blast furnace bottom part in the said embodiment. It is an expanded sectional view which shows the cutting | disconnection division | segmentation in which the horizontal movement means in the said embodiment is installed. It is an expanded sectional view which shows the cutting | disconnection division in which the horizontal movement means in the said embodiment is not installed. It is a figure which shows another aspect of a horizontal movement means provided with the furnace body load support member using (alpha) material. It is a figure which shows another aspect of a horizontal movement means provided with the furnace body load support member using HPA + (alpha) material. It is a figure which shows another aspect of a horizontal movement means provided with the furnace body load support member which used HAP independently. It is a figure which shows the carrying-out aspect of the furnace bottom part of the blast furnace in the said embodiment. It is a figure which shows the side aspect of the blast furnace bottom part just before carrying out in the horizontal movement means which uses a floor plate and a sliding board as a horizontal movement member in the said embodiment. It is a figure which shows the plane aspect of the blast furnace bottom part just before carrying out in the horizontal movement means which uses a floor plate and a sliding board as a horizontal movement member in the said embodiment. It is an expanded sectional view which shows the cutting | disconnection division in which the horizontal movement means in other embodiment of this invention is not installed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Blast furnace 11 Foundation concrete 12 Laying beam 13 Blast furnace main body 14 Furnace rod 15 Exhaust pipe 16 Annular pipe 17 Furnace top outrigger crane 18 Temporary extension deck 19 Loading device 21 Beam or temporary jack receiving beam 22 Post 23 H-section steel 24 Cooling pipe 25 Grout material 26 Furnace bottom plate 28 Stamp material 29 Iron skin 30 Stave cooler 31 Furnace bottom brick layer 32 Chaotic lump 33 Residue 34 Upper mantel 35 Furnace bottom mantel 36 Blast furnace bottom 41 Horizontal hole 44 Floor plate 45 Sliding as a laterally moving member Plate 46 Sliding surface which is a laterally moving member 47 Upper horizontal surface (cut surface)
48 Lower horizontal surface (cut surface)
49 Horizontal cutting part 50 Center hole jack 51a HPA which is a furnace load support member
51b α material which is a furnace body load support member 52 Suspension bracket 53 Lateral moving means 56, 56A Cavity 57 Heavy goods transport carriage 58 Jack 59 Index wire 60 Brackets 68a, 68c, 68e, 68g, 68i Lateral moving means are arranged Cutting sections 68b, 68d, 68f, 68h, 68j Cutting sections where no lateral movement means are arranged 69a to 69k Boundaries 70a to 70j Wire

Claims (3)

A method for disassembling a blast furnace bottom part by separating the blast furnace bottom part from a foundation concrete or base grout located below the blast furnace bottom part, and carrying out the following steps 1 to 5 in advance during the operation of the blast furnace. The method for dismantling the bottom of the blast furnace furnace, wherein the following step 6 is performed during the repair period after the blast furnace is blown off.
Step 1: A plurality of cutting sections parallel to the drawing direction of the blast furnace bottom are set on the horizontal cutting plane set in the basic 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 saw wire into the adjacent horizontal hole, cut the basic concrete of the cutting section along the upper horizontal plane and the lower horizontal plane maintaining the required height, and between the upper and lower horizontal cut planes A certain cut foundation concrete or base grout is discharged to form a gap parallel to the drawing direction, and a lateral movement member for carrying out the blast furnace bottom is disposed in the gap, and the gap is placed in the gap. A furnace body load support member that supports the furnace body load is disposed in a gap between the upper surface of the laterally moving member and the upper horizontal cut surface.
Step 4: A wire saw wire is inserted into the adjacent horizontal hole, and the basic concrete of the cutting section is cut along a horizontal plane that maintains a required height.
Step 5: Repeat Step 3 for any one of the cutting sections, and repeat Step 4 for the other cutting sections, so that the blast furnace bottom and the foundation concrete or base grout are horizontally cut. Separate at.
Step 6: After separating the upper mantel from the bottom of the blast furnace and lifting and fixing it, a horizontal force is applied to the bottom of the blast furnace and carried out of the system.   The method for disassembling a blast furnace bottom according to claim 1, wherein the step 3 and the step 4 are alternately adjacent to the cutting section.   The method for disassembling a blast furnace bottom according to claim 1 or 2, wherein a friction modifier is injected into the horizontal surface in the step 4.

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