JP5540568B2 - Blast furnace furnace body construction and repair method - Google Patents

Description

  The present invention relates to a method for constructing a blast furnace furnace body and a method for refurbishing the blast furnace furnace body with the blast furnace furnace body in a ring-shaped block, and in particular, new construction and repair of a blast furnace furnace can be performed in a short period of time. We propose a method to make it possible.

In recent years, blast furnace construction and refurbishment have been made by adopting a so-called "ring-shaped block method" in which a blast furnace furnace body is constructed or refurbished in a ring-shaped block state, as disclosed in Patent Documents 1 and 2. It can be done in a short period of time.
This method is a method in which the space between the top and bottom of the blast furnace core is divided into a plurality of ring-shaped blocks. For example, when assembling the furnace body during the construction of the blast furnace, the ring-shaped blocks excluding the bottom block of the furnace are sequentially carried on the caisson from the uppermost stage to the lowermost stage, and on the caisson, First, the uppermost ring-shaped block is lifted up to a height at which the upper ring-shaped block to be stacked under it is inserted. Next, after the upper ring-shaped block is carried directly under the uppermost ring-shaped block, the uppermost ring-shaped block is lowered and overlapped on the upper ring-shaped block. Are lifted together, and the next lower ring-shaped block is carried immediately below, and the same operation is repeated. In this manner, a plurality of ring-shaped blocks are sequentially connected, and finally, the furnace bottom ring-shaped block is fixed together with the furnace bottom bottom plate on the base (caisson) of the blast furnace.

  On the other hand, when the furnace body is dismantled for refurbishing the blast furnace, the ring-shaped block is replaced with lifting equipment (a winch or a hydraulic suspension jack, lift jack, wire By using jacks, center hole jacks, etc.), contrary to the case of the assembly work described above, the lower ones are cut in order, and the upper ring-shaped block is lifted and the carrier cart is used to remove the caisson. The method is taken out.

  In addition, when the equipment required for lifting from the uppermost ring-shaped block to the lowermost ring-shaped block by the lifting equipment is not on the attached blast furnace or when there is no reinforcing means, the ring-shaped There is also a method in which the ring-shaped blocks are individually lifted by the lifting and lowering equipment distributed by dispersing the lifting fulcrum of the block on the attachment rod of the blast furnace and / or the furnace column.

  For example, as a typical conventional technique for assembling a new furnace body, there is a method performed in the order shown in FIGS. In this method, first, as shown in FIG. 1, the uppermost ring-shaped block A manufactured at a factory or the like is carried onto the caisson 5, and on the caisson 5, the uppermost ring block A is used by using the lifting equipment Wa. After the upper ring-shaped block A is lifted up to a clearance height at which the next upper ring-shaped block B can be loaded, the upper ring-shaped block B is loaded onto the caisson 5 as shown in FIG. The upper ring block B is lifted by using the lifting equipment Wb.

  Next, together with these ring-shaped blocks A and B, a plurality of lifting equipments Wa and Wb (a plurality are arranged in the circumferential direction, two are shown here) up to the gap height where the next ring-shaped block C enters. After being lifted up at once, the next lower ring-shaped block C is carried onto the caisson 5 in the gap formed. Then, as shown in FIG. 3, the lower ring-shaped block C is lifted up to a height at which the next ring-shaped block D enters using another lifting / lowering equipment Wc, and then the furnace bottom portion ring-shaped which becomes the next lowermost stage. The block D is carried onto the caisson 5, and at this stage, as shown in FIG. 4, the ring-shaped blocks are stacked in the order of D → C → B → A. After that, each block is welded and joined in sequence to construct or repair the blast furnace.

  Thus, in the above-described conventional method of lifting each ring-shaped block using a plurality of lifting equipments Wa, Wb, Wc, not only the assembly work of the new furnace body, but also when the old furnace body is disassembled The method is taken. For example, as shown in FIG. 5, when dismantling the old furnace body, the ring blocks A to C are supported by different lifting equipments Wa, Wb, Wc, and in the reverse order to the assembly of the new furnace body. Then, as shown in FIGS. 6 and 7, the ring-shaped block is sequentially cut from the lower ring-shaped block, suspended by lifting equipment, and carried out of the caisson 5 by using a transport carriage. The method is taken.

  In addition, Patent Document 1 discloses a method for shortening the time when connecting the upper and lower adjacent ring blocks, and Patent Document 2 divides welding between the ring blocks into two stages. There are proposals for blast furnace refurbishment and construction methods to shorten the time by, for example.

In the above-described known blast furnace construction and refurbishment methods, it took about 7 to 10 days to disassemble the old furnace body and assemble the new furnace body. In addition, there is a need for a technology that enables construction and renovation of the blast furnace in a shorter time by shortening the period of dismantling the old furnace body.
Japanese Patent No. 3165362 Japanese Patent No. 3157723 Japanese Patent No. 3111029

  The conventional ring block construction method, for example, when disassembling the old furnace body, when dividing the furnace body into a plurality of ring blocks, when cutting the iron core of the old furnace body into a ring shape in advance Instead of completely cutting this, a partially uncut portion (uncut portion) is left, and the ring-shaped block below is hung by the uncut portion. This is the idea that the upper ring-shaped block bears the weight of the ring-shaped block located below the cutting portion. That is, when carrying out the ring-shaped block of the separated old furnace body from the caisson, after setting the ring-shaped block lower than the cutting part on the caisson 5, the iron shell of the uncut portion is cut, and this At the time, the upper and lower ring-shaped blocks sandwiching the cutting portion can be completely cut off, and then the separated ring-shaped blocks of the old furnace body are carried out from the caisson 5.

  However, in the above-mentioned conventional method of leaving this uncut portion, the iron cutting operation of this uncut portion is one because the plate thickness of the iron shell is usually as thick as 40 mm to 90 mm and the cutting length is as long as around 5 m. At least 2 to 3 hours were required for the cutting. In addition, since this work is necessary every time the ring-shaped block to be removed is completely trimmed, the work time alone requires about 10 hours.

  On the other hand, the assembly of a new furnace body under the conventional method is performed by directly welding the connection of the upper and lower ring-shaped blocks to be the new furnace body. That is, first, the uppermost ring-shaped block, which is the top of the furnace, is carried onto the caisson, and then the uppermost ring-shaped block is lifted up, and the upper-stage ring-shaped block at the lower level to be connected to this is moved up. The upper ring-shaped block and the upper ring-shaped block are connected to each other by welding after carrying in and aligning the core connecting portions of each other. Thus, after the upper and lower ring-shaped blocks to be connected are stacked, complete welding connection is sequentially performed each time. However, in this operation, the thickness of the ring-shaped block (iron skin) is as large as 40 mm to 90 mm, and the peripheral length of the iron skin is as long as 35 to 60 m. Therefore, it takes a long time for welding. Moreover, this work has to be performed in an environment where staves, refractories, and the like are arranged on the inner surface side of the iron skin.

  Therefore, these welding connection processes by the conventional method are about 10 to 15 hours, and the entire assembling work for constructing a new furnace body requires 30 hours to 50 hours. In addition, in this assembling work, it is also necessary to align the upper and lower ring blocks at the time of assembling. However, this centering operation requires accuracy within 5 mm from the viewpoint of welding reliability. For example, in order to center a ring-shaped block having a diameter of 12 m to 19 m with such accuracy, at least 3-6. It took time, and the entire assembly process took 10-20 hours.

  The above-described centering operation is performed by, for example, lowering the upper ring-shaped block to a position close to the lower ring-shaped block as in Patent Document 3, and using a jack or the like as the side surface of the upper ring-shaped block. This is done by pressing in the horizontal or circumferential direction and aligning with the lower ring-shaped block. As shown in FIG. 8, this work is a method of aligning the center of the upper ring-shaped block by pushing it in the horizontal or circumferential direction with a jack or the like so as to match the lower ring-shaped block. In the case of this method, the swing fulcrum of the upper ring-shaped block becomes the lifting equipment part (3a, 3b).

  That is, when the upper ring-shaped block is pushed in the horizontal direction or the circumferential direction as shown by the arrow a under the state where it is lifted by the jacks 3a and 3b, the upper ring-shaped block is slightly upward on the swing destination side. It leans up and begins to lean. For example, in FIG. 8A, when the upper ring-shaped block A is aligned with the lower ring-shaped block B, when it is pushed in the horizontal direction (a) according to the misalignment amount, the ring-shaped block A is Although it moves to the A1 position, if the position of the suspension jacks 3a, 3b is narrower than the diameter of the ring-shaped block A, the pushed side is lifted by swinging. On the contrary, as shown in FIG. 8B, when the position of the suspension jacks 3a and 3b is larger than the diameter of the ring-shaped block A, the pushing side is lowered. Therefore, in such a centering operation, when the amount of misalignment is large, it is necessary to slightly raise and lower the upper ring-shaped block A, and as described above, 10 to 20 hours, and in some cases 24 hours. You will spend a lot of time.

  Therefore, the time required for cutting-disconnecting the old furnace ring-shaped block during dismantling and welding-connecting the new furnace ring-shaped block during assembly is 50 to 80 hours in total. It took about half of the entire furnace body disassembly and assembly process.

  It is an object of the present invention to enable quick connection of a ring block for a new furnace body and cutting / disconnecting of a ring block for an old furnace body, as well as assembly / disassembly of a new and old furnace body. By simplifying the process, it is intended to make it possible to perform a blast furnace refurbishment including a new blast furnace construction and disassembly-assembly in a short time.

  The present invention overcomes the above-mentioned problems of the prior art, and uses a ring-shaped block of the new and old furnace bodies as an uncut part (uncut part), Instead of the method of performing the center-to-center welding, it is a proposal for a method of simply separating or temporarily connecting the ring-shaped blocks at the upper and lower stages using a coupling tool.

  For example, when dismantling the old furnace body, which is necessary for blast furnace refurbishment, when cutting the height direction of the furnace body at multiple positions into ring-shaped blocks, before completely cutting each boundary The upper and lower ends of the upper and lower portions of the boundary portion, that is, the upper and lower ends of the boundary portion are preliminarily connected with a connecting tool, whereby the ring-shaped block is lower than the cutting portion. Is suspended and supported by a ring-shaped block at the upper level, and then complete cutting in the circumferential direction of the iron skin is performed. And each ring-shaped block cut | disconnected in this way is mounted on a caisson, and it carries out after cut | disconnecting the said connection tool (edge cutting) after that. In this way, it is not necessary to use a large number of lifting equipments, and each block can be separated more quickly than by gas cutting the uncut portion of the iron skin later.

  In this regard, in the conventional demolition work of the old furnace body, it was decided to cut off the uncut portion of the iron shell, which was a critical process, and then to completely separate the upper and lower ring blocks. Each ring block was carried out from the caisson. However, in the present invention, since this series of operations can be carried out immediately only by the operation of cutting (edge cutting) the connector, the time for the edge cutting operation can be greatly shortened.

  On the other hand, in assembling the new furnace body during construction of a new blast furnace or renovation of the blast furnace, the uppermost ring block in the upper level is loaded onto the caisson, and then the loaded uppermost ring block is moved up and down. Then, the next upper ring-shaped block to be connected to this is loaded on the caisson and stacked, and at this stage, the upper and lower ring-shaped block blocks are connected to each other. In the case of the present invention, at this stage, the upper and lower ring-shaped blocks are not directly connected to each other by welding, but first, the upper ring-shaped block and the lower ring-shaped block are temporarily connected via a connector. Keep it.

  Then, each ring-shaped block is temporarily connected by a coupling tool, and after the furnace-bottom ring-shaped block has been installed on the caisson, the ring-shaped blocks located above them are sequentially aligned, and each ring-shaped block After all the centering has been completed, welding is performed at each connection point to complete the assembly of the furnace body.

In such an assembly method, mutual welding between the ring-shaped blocks constituting the new furnace body can be simultaneously performed in parallel, which is effective in shortening the working time.
Furthermore, with this assembly method, it is also possible to carry out the in-furnace brick stacking process, which is the next process, in parallel. This simplifies the work of assembling the new furnace body by half.

As is apparent from the above description, the present invention is basically a new furnace of a blast furnace by sequentially collecting and stacking a ring block for a new furnace body obtained by dividing a plurality of places in the height direction from the upper one. When constructing the blast furnace body by assembling the body, or cutting the old furnace body of the existing blast furnace at multiple places in the height direction, and removing the resulting ring-shaped blocks sequentially from the lower one and dismantling Subsequently, the blast furnace body was refurbished by assembling the blast furnace body by sequentially loading and stacking the new furnace body ring-shaped blocks obtained by dividing multiple places in the height direction. Prior to welding connection or cutting between ring-shaped blocks in the new furnace assembly process or old furnace body disassembly-assembly process, the upper and lower ring blocks are connected to each other. Other cutting unit, by previously temporarily connected by coupling, in construction or renovation of a method of blast furnace body, characterized in that keep suspended supporting lower ring block in the upper part of the ring-shaped block is there.

In the present invention according to the above configuration,
a. In the process of assembling the new furnace body during construction, first connect the lower end of the ring-shaped block that will be located in the upper stage to be newly loaded and the upper end of the ring-shaped block that will be located in the lower stage by attaching a connecting tool. Next, stacking the upper and lower ring-shaped blocks and assembling the furnace body, and then performing centering and welding connection between the upper and lower ring-shaped blocks,
b. In the old furnace body dismantling process for repair, when the old furnace body is dismantled, a plurality of portions along the cutting line between the lower ring-shaped block at the lower level and the upper ring-shaped block positioned at the upper level are disposed. At the location, during cutting or prior to cutting, a connecting tool is attached in advance to temporarily connect these blocks, and then cut completely along the cutting line without leaving an uncut portion, Cutting the connecting tool at the time of unloading and separating each ring-shaped block sequentially to carry out unloading;
c. Temporary connection between the upper and lower ring-shaped blocks by the coupling tool during assembly or disassembly is performed between a pair of brackets formed of a plurality of sets fixed along the furnace circumferential direction of the connection portion or the cutting portion. Using a variable connector comprising a connecting member attached to be horizontally movable,
d. The variable connector comprises a parallel link mechanism with a bracket and a connecting member;
e. The connecting member is made of a flexible material;
f. The connecting member comprises a rod;
g. The flexible material is a wire or chain;
Is a more preferred embodiment.

  According to the method of constructing the blast furnace body of the present invention and the method of refurbishing the blast furnace body of the present invention configured as described above, the following effects can be expected.

(1) In the assembly process, since the new furnace body is brought in and welded between the ring-shaped blocks, it is a method of temporarily connecting the ring-shaped blocks with a coupling tool, so that the work is simplified as described below. The construction period can be shortened.

  In the conventional construction method, when assembling the new furnace body, the ring-shaped block of the new furnace body was restricted by the lift jack, and it was difficult to align the center of the ring-shaped block on the lower side. For example, a method of temporarily connecting ring-shaped blocks with a coupling tool and a centering operation are performed using a variable coupling tool that can move in the horizontal direction. Installation accuracy is improved. Further, since the centering operation can be performed in parallel with the brickwork in the furnace after all the ring-shaped blocks are taken in, it is excluded from the critical process and contributes to shortening the work period.

(2) Since the old furnace body can be completely cut in advance in the dismantling process, it is unnecessary to perform the edge cutting work of the uncut portion of the old furnace body cutting part, which is an essential process when dismantling and carrying out under the conventional technology. Become. That is, in the present invention, the edge can be cut only by cutting the wire or rod of the connector, so that the dismantling operation is simplified and the construction period can be shortened.

(3) Due to these effects, according to the present invention, the renovation of a large blast furnace with an internal volume of 4000 m ³ or more (from the dismantling of the old furnace body to the assembly of the new furnace body) is only about 2-3 days. It can be completed in a short period of time. Of course, the present invention is effective not only as a modification of a blast furnace, but also as a new blast furnace construction technique.

It is a schematic diagram which shows the mode of a furnace top part ring-shaped block carrying-in at the time of an assembly according to a conventional construction method. It is a schematic diagram which shows the mode of upper stage ring-shaped block carrying-in at the time of an assembly according to a conventional construction method. It is a schematic diagram which shows the mode of lower stage ring-shaped block carrying-in at the time of an assembly according to a conventional construction method. It is a schematic diagram which shows the mode at the time of completion of assembly of a blast furnace according to a conventional construction method. It is a schematic diagram which shows the mode at the time of carrying out a furnace bottom part ring-shaped block at the time of the demolition according to a conventional construction method. It is a schematic diagram which shows the mode at the time of carrying out a lower stage ring-shaped block at the time of a disassembly according to a conventional construction method. It is a schematic diagram which shows the mode at the time of carrying out the upper stage ring-shaped block at the time of a disassembly according to a conventional construction method. It is a schematic diagram which shows the mode of center alignment of the upper and lower stage ring-shaped blocks at the time of disassembly according to a conventional construction method. It is a schematic diagram which shows a mode that the furnace bottom part ring-shaped block is carried out at the time of the disassembly according to this invention method. It is sectional drawing which shows the structure of the general cutting part at the time of the old furnace body demolition. It is sectional drawing which shows the structure of a cutting part at the time of the old furnace body disassembly according to this invention method. It is a schematic diagram which shows the condition of a furnace bottom part ring-shaped block separation at the time of the old furnace body demolition according to this invention method. It is a schematic diagram which shows the mode of a furnace bottom part ring-shaped block carrying out at the time of the old furnace dismantling according to other embodiment of this invention method. It is a schematic diagram which shows the mode of carrying out a lower ring-shaped block at the time of the old furnace dismantling according to other embodiment of this invention method. It is a schematic diagram which shows the mode of carrying in a furnace top part ring-shaped block at the time of a new furnace body assembly according to this invention method. It is a schematic diagram which shows the mode of carrying in the upper stage ring-shaped block at the time of a new furnace body assembly according to this invention method. It is a schematic diagram which shows a mode that an upper stage and a lower stage ring-shaped block are temporarily connected using a coupling tool at the time of a new furnace body assembly according to this invention method. It is a schematic diagram which shows a mode that the lower stage ring-shaped block is carried in which shows other embodiment according to this invention method. It is a schematic diagram which shows a mode that a furnace bottom part ring-shaped block is guided on a caisson at the time of a new furnace body assembly according to this invention method. It is a schematic diagram which shows the first process of assembling | stacking a furnace top ring-shaped block using a suspension type jack at the time of assembly of a new furnace body according to other embodiment of this invention method. It is a schematic diagram which shows the mode at the time of carrying in the upper stage ring-shaped block at the time of the new furnace body assembly according to other embodiment of this invention method. It is a schematic diagram which shows the mode at the time of carrying in the lower ring-shaped block at the time of the new furnace body assembly according to other embodiment of this invention method. It is a schematic diagram which shows the mode at the time of carrying in a furnace bottom part ring-shaped block at the time of assembly of a new furnace body according to other embodiment of this invention method. It is a schematic diagram which shows the new furnace assembly method according to further another embodiment of this invention method. It is a schematic diagram which shows the new furnace assembly method according to further another embodiment of this invention method. It is a schematic diagram which shows different embodiment (a), (b) of the variable connector used by the method of this invention. It is a schematic diagram which shows further another embodiment of the variable connector used by the method of this invention.

  Hereinafter, based on the ring-shaped block construction method applied by providing a ramp up to the caisson, first, a method for repairing a blast furnace according to the present invention will be described. In addition, the construction method of a new blast furnace is the same as the process of assembling a new furnace body among the blast furnace repair methods described below. The present invention is not limited to the following specific examples.

FIG. 9 is an example of an old furnace body dismantling showing a state in which the furnace bottom part, which is the lowest stage, is cut off as a furnace bottom part ring block and dismantling is started.
In the present invention, when disassembling and assembling the new and old furnace bodies as a plurality of ring-shaped blocks, the furnace top block and the furnace bottom block may include blocks that do not become ring-shaped. Are collectively referred to as ring-shaped blocks in the present invention.

  In the figure, reference numeral 1 denotes a furnace column, 2 denotes an upper attachment rod, and 3 denotes a suspension jack as a lifting device for a ring-shaped block installed on the attachment rod. 4 is a furnace body, and 4A to 4D are ring-shaped blocks in a divided state. In the figure, 5 is a caisson that is a blast furnace foundation, 6 is a ramp, and 15 is a transport carriage.

  FIG. 9 shows a state where the furnace bottom portion ring-shaped block 4 </ b> D cut and carried out is carried out to the ramp 6. FIG. 10 shows the structure of the cutting part at the time of dismantling the old furnace body block. The iron skin of the old furnace body is cut from the outside, and reference numeral 14 in the figure is a cut portion of the iron skin. 7 and 8 shown in the figure are iron skins that become an upper ring-shaped block and a lower ring-shaped block after cutting, 9 is a stave, and 10 is a refractory. In this illustrated example, the cutting position is set to the embedment position of the refractory 10 between the staves 9. However, the cutting position is not limited to this position, and the stave embedding position may be used. In short, at any position, if the iron shell part can be cut and separated, the remaining part is the stave 9 and the cooling water supply pipe extending up and down, the lining refractory, or the furnace deposit, and can be separated. is there.

  Conventionally, when the old furnace body is cut as a ring-shaped block, most of the circumferential direction is cut in advance and a part is left uncut, and the ring-shaped block is transferred to the carriage 15 on the caisson 5. In the state of being attached, the uncut portion of the uncut portion of the iron skin was cut to completely separate the ring-shaped block. In addition, this iron-cutting is the operation | work which divides | segments to the magnitude | size which is easy to carry out, Comprising: The example shown in FIG. 9 is an example which disassembles the old furnace body into the ring-shaped blocks 4A-4D of 4 divisions, It is preferable to disassemble as 3 to 5 divisions depending on the size of the body.

  FIG. 11 shows the structure of the cutting part at the time of dismantling the old furnace body according to the method of the present invention. This figure shows a state in which the upper and lower ring-shaped blocks are temporarily connected via the coupler 13. As shown in the figure, the iron skin 7 that is the upper ring-shaped block and the iron skin 8 that is the lower ring-shaped block are paired in advance in the vicinity of these cut portions, the upper end portions along the connection portions, and the lower end portions. A plurality of sets of brackets 11 and 12 are fixed by welding. A connecting member 13 a made of a wire, a rod, a chain, or the like is attached between the brackets 11 and 12 to form a connecting tool 13. In a preferred form of the connector 13, a flexible material, for example, a material such as a wire chain, is used as the connecting member 13 a, and at least one of the upper or lower ring blocks can be moved in the horizontal direction. The variable type connecting tool is used. These couplers 13 (hereinafter referred to as “connector 13”, including variable couplers) are attached later and are used to temporarily connect the upper and lower ring blocks. It is.

  Temporary connection using the above-mentioned coupler 13 is performed by cutting the old furnace body into ring blocks before or after the end of cutting the iron shells 7 and 8 into old ring bodies. In doing so, the majority of the portion may be cut in advance, and the connection tool attached to the cut portion may be attached at the same time, and this may be performed in parallel with the cutting operation.

  As a result, after being cut into the upper ring-shaped block and the lower ring-shaped block, the lower ring-shaped block is suspended and supported by the upper ring-shaped block by this connecting tool 13, particularly via the connecting member 13 a. It becomes a state.

  In this regard, the conventional procedure for cutting the ring-shaped block has been dealt with by leaving only the length necessary to support the lower ring-shaped block (uncut portion). And when carrying out a ring-shaped block, after lifting down all the ring-shaped blocks using a suspension-type jack, and mounting on the conveyance trolley 15 on the caisson 5, it is the uncut part of a high-order ring-shaped block. In this way, the lower ring-shaped block to be carried out for the first time at this point is completely cut off.

  On the other hand, in the present invention, as shown in FIG. 12, when the ring-shaped blocks 4A, 4B, and 4C are cut, they are being cut by the coupler 13 or before cutting. Temporarily connect in advance. For example, when the ring-shaped block 4C is cut and carried out, the ring-shaped blocks 4A, 4B, and 4C that are temporarily connected by the coupler 13 are used to suspend the ring-shaped block 4C by using the suspension jack 3 on the lower attachment rod 1. Lifting down, placing the ring-shaped block 4C on the transport carriage 15 on the caisson 5, and then cutting the connecting member 13 connecting the ring-shaped block 4B and the ring-shaped block 4C for the first time at this point, the ring-shaped block 4B. The ring-shaped block 4C is completely separated. Thereafter, the ring-shaped block 4C is placed on the transport carriage 15 and carried out from the caisson 5 through the ramp 6.

  Thus, in the present invention, when dismantling the furnace body, as shown in FIG. 11, the cut portions 14 of the ring-shaped blocks 4A to 4C are first bracketed on the outer surfaces of the upper and lower iron skins 7 and 8 along the cutting line. 11 and 12 are welded and fixed, and a connecting member 13a such as a wire or a rod (in the illustrated example, the rod is fastened with a nut 16) is provided between a plurality of brackets 11 and 12 that are attached in a pair in the circumferential direction. It is set as the state which temporarily connected by the coupling tool 13 comprised by attachment, and was suspended and supported. In this case, each cut part of the ring-shaped blocks 4A to 4C is completely cut without leaving an uncut part as in the prior art. As a result, in the method of the present invention, when unloading, there is no work of separating (edge cutting) the uncut portion of the iron skin, only the work of separating the connecting member 13a, and only the simple work remains.

  Next, when carrying out the ring-shaped block 4B, both the ring-shaped blocks 4A and 4B are lifted down by using the suspension jack 3, and the ring-shaped block 4B is placed on the transport carriage 15 on the caisson 5, and then the ring-shaped block 4B is unloaded. The connecting member 13a is cut in order to cut the edge with the block 4A. In this way, in the method of the present invention, the edge cutting operation between the ring-shaped blocks only needs to blow off some of the connecting members 13a attached along the cutting line in the furnace circumferential direction with a gas torch. Therefore, the working time can be greatly reduced as compared with the conventional cutting operation of the uncut portion.

  In addition, in FIG. 11, the brackets 11 and 12 and the connecting member 13a constituting the connecting tool 13 are temporarily connected between ring blocks (indicated by the iron skins 7 and 8) positioned above and below. At the time of unloading, the ring-shaped block is a member that is cut in order to cut edges. The coupler 13 only needs to have a number and strength enough to suspend and support the ring-shaped block that is positioned at the lower level. For example, the connecting member in the illustrated example is a combination of the connecting member 13a and the nut 16, but when a wire clamp device (Japanese Patent Publication No. 6-71999, Japanese Patent Application Laid-Open No. 2006-125563, etc.) is used, as shown in FIG. In addition, a wire is simply stretched as the connecting member 13a between the brackets 11 and 12, and the connection is simple and the cutting can be easily and quickly performed. In this example, the connector 13 is cut at the edge between the ring-shaped blocks. However, the edge can also be cut by removing the nut 16, and either cutting or removal can be selected depending on the construction contents. do it.

  As another embodiment of the present invention, a suspension-type jack (a “center hole jack of a type that lifts and lowers evenly with several wires” is provided in which a ring-shaped block is suspended on an attached rod and / or a furnace column. The method of lifting the ring-shaped blocks individually using a so-called ")" will be described in an example of dismantling the old furnace body.

  In this embodiment, as shown in FIG. 13, the furnace body 4 is divided into ring-shaped blocks 4A to 4D and disassembled. In this example, the ring-shaped blocks 4A, 4B, and 4C share the roles of the suspension-type jack 3a that suspends the ring-shaped blocks 4A and 4B and the suspension-type jack 3b that suspends the ring-shaped block 4C. This is different from the 9 example. However, the other points are the same as the example shown in FIG. 9 such as cutting, separation, and carrying out at the time of dismantling the old furnace body. More specific description will be given below.

  In this embodiment, as shown in FIG. 14, in the state where the ring-shaped blocks 4A and 4B are temporarily connected using the coupler 13, the lower ring-shaped block 4C is carried out following the furnace bottom ring-shaped block 4D. At this time, the ring-shaped blocks 4A, 4B and 4C are suspended by being divided into different suspension-type jacks 3a and 3b. That is, at this time, the ring-shaped block 4C is supported by a suspension type jack 3b different from the ring-shaped blocks 4A and 4B, so that the ring-shaped block 4C is separated as it is and lifted down as shown in the figure. Then, the ring-shaped block 4 </ b> C is carried on the transport carriage 15 on the caisson 5.

  Then, the ring-shaped block 4A and the ring-shaped block 4B located above it are separated from the old furnace body before or during the cutting of the iron skin, or the old furnace body is made into a ring shape. When cutting, most of the parts are cut in advance, and the connecting tool 13 is attached to the cut parts to temporarily connect them. Thereafter, the ring-shaped blocks 4A and 4B that have been temporarily connected by the coupling tool 13 are lifted down by the suspension jack 3a, and the coupling member 13a of the coupling tool 13 that connects the ring-shaped blocks 4A and 4B is cut. Thus, for the first time at this point, the ring-shaped block 4A and the ring-shaped block 4B are completely separated, thereby enabling the ring-shaped block 4B to be carried out. Then, the remaining ring-shaped block 4A is lifted down and carried out as it is, and the dismantling of the old furnace body is completed.

  Next, an embodiment at the time of assembling a new furnace body according to the method of the present invention will be described based on an example shown in FIGS. In addition, this embodiment is a method that can be directly applied to the construction of a new blast furnace. As shown in FIG. 15, the new furnace body is assembled by first carrying the uppermost furnace top ring block 4 </ b> A onto the caisson 5 via the ramp 6 while being placed on the transport carriage 15. Then, the furnace top ring-shaped block 4A is suspended by the suspension wire of the suspension-type jack 3a and lifted up. Next, as shown in FIG. 16, the upper ring-shaped block 4B, which is positioned below the uppermost furnace top ring-shaped block 4A, is carried onto the caisson 5 by the transport carriage 15, and the ring-shaped block 4A is It is installed on the caisson 5 generated by lifting up. Then, the lower end portion of the ring-shaped block 4A and the upper end portion of the ring-shaped block 4B are temporarily connected by the coupler 13.

  An example of the temporary connection between the furnace top ring-shaped block 4A and the upper ring-shaped block 4B is shown in FIG. In the case of the temporary connection illustrated here, first, the brackets 11 and 12 are fixed in advance to the lower end portion of the core 7 that is the furnace top ring block 4A and the upper end of the core 8 that is the upper ring block 4B. To do. And between these brackets 11 and 12, the connecting member 13a such as a wire or a rod described above, and the illustrated example uses the connecting tool 13 in a state where a wire by the wire clamp device 13b is arranged and connected.

  About 10 to 70 connectors 13 are arranged in the furnace circumferential direction. Basically, the same one as that used for dismantling described above is used. However, since the centering on the caisson 5 is required when assembling the new furnace body, the temporary ring-shaped block 4A and the upper ring-shaped block 4B are temporarily installed. It is effective to use a variable connector having a structure in which one or both of these ring-shaped blocks 4B move in the horizontal direction.

  For example, as an example of such a variable connector 13, there is a flexible material that is between the brackets 11 and 12, and at least one of the ring-shaped blocks is temporarily connected and can be moved in the horizontal direction, or It is preferable to use a connecting means that can allow horizontal movement. The former is preferably a wire or chain that can withstand a high load, and the latter is preferably a rod.

  In addition, the variable connector 13 has a structure such as a bracket on the brackets 11 and 12 side that has a seat processing that can cope with the rod tilt during the horizontal movement operation or a hole diameter that allows the rod tilt. Those are preferred. It is preferable that the brackets 11 and 12 formed of a plurality of pairs at the top and bottom are arranged substantially horizontally. In addition, since the connection tool 13 used in the old furnace body disassembly process is only for suspending and supporting the lower ring-shaped block, there is no need for center alignment, and the cutting process is performed thereafter. The variable type is not necessary, but can be used.

  At the time of assembling this new furnace body, it is preferable to provide a groove processing portion 21 at the time of welding connection in the gap between the iron skins 8 and 9 of the upper and lower ring blocks to be connected.

After that, as shown in FIGS. 18 and 19, the lower ring-shaped blocks 4 </ b> C and 4 </ b> D are carried and placed on the caisson 5. And the connection with 4B of the ring-shaped block 4C is the same procedure as the method shown in FIG. 15, for example, temporarily connected using the variable coupling tool 13, and performs suspension support.
In the above description, the new furnace body is shown as an example of four divisions. However, depending on the size of the blast furnace, it may be divided into three divisions, five divisions or six divisions. This method can be performed in the same manner as described above.

  Thereafter, in accordance with the same process as described above, the bottom furnace ring-shaped block 4D which is the lowest stage is carried in, and after the temporary connection by the variable coupler 13 in the same manner, the entire ring-shaped blocks 4A, 4B, 4C and 4D are At the same time as lifting all together, the carriage 15 is retracted and then installed on the caisson 5. First, after the centering of the lowermost furnace bottom ring block 4D, the upper ring blocks 4C to 4B and 4A are sequentially stacked while being centered.

  In the present invention, once the ring-shaped blocks 4C to 4A are collectively lifted, the bottom ring-shaped block 4D that is the lowest stage is carried in, centered to specify its construction position, After the furnace-bottom ring-shaped block 4D is installed, the ring-shaped blocks 4A, 4B, and 4C that have been lifted are stacked while sequentially centering from the ring-shaped blocks 4C to 4B and 4A. It may be.

  In particular, if a brick (including irregular refractory) structure is built in advance in the bottom furnace ring ring block 4D, the bottom furnace ring ring block 4D is extremely heavy and can be lifted. When this is done, the ring-shaped block may be bent and the brick structure may be cracked. In this case, first, the lowermost furnace bottom ring-shaped block 4D that has been carried in is moved without being hung to perform positioning and centering, and the installation on the caisson 5 is completed. Then, the bottom-stage furnace bottom ring-shaped block 4D that has been installed is stacked while being centered sequentially from the ring-shaped block 4C that is higher than the ring-shaped blocks 4A, 4B, and 4C that have been suspended as described above. To do.

  In the centering operation, the upper furnace block is aligned with the furnace body while the side surfaces of the upper furnace body block are pushed in the horizontal direction or the circumferential direction by a plurality of suspension jacks 3a. At this time, for example, centering is performed sequentially from the ring-shaped block 4D, but when a misalignment occurs (for example, when a ring-shaped block having a diameter of 12 m to 19 m exceeds 5 mm, a misalignment occurs) In order to align the upper ring-shaped block 4C, the side surface of the upper ring-shaped block 4C is pushed in the horizontal direction or the furnace circumferential direction using the suspension-type jack 3a to align the lower ring-shaped block 4D. At this time, when the variable connector 13 is used, since the horizontal movement is possible between the upper ring-shaped blocks 4B and 4C, this operation is performed easily and quickly. This also applies to the alignment between the ring-shaped blocks 4B and 4C and the alignment between the ring-shaped blocks 4A and 4B.

  The ring-shaped blocks 4A to 4D that are centered and stacked in this way are then completely connected by welding. That is, after carrying in and provisionally connecting each ring-shaped block that becomes a new furnace body, after the centering and stacking steps of each ring-shaped block 4A to 4D, a groove processing portion provided in a gap portion that serves as a connection portion between them 21 parts are welded together to complete the assembly of the furnace body. At this time or after this operation, the connector 13 is melted and removed.

  Still another embodiment of the present invention uses a suspension-type jack having different roles in which the lifting position of the ring-shaped block is distributed on the blast furnace attachment rod 2 and / or the furnace column 1 in a distributed manner. In this method, the blocks are lifted individually to construct a blast furnace and to repair the blast furnace.

  An example of this embodiment will be described with reference to FIGS. First, FIG. 20 shows the state of carrying in and taking in the furnace top ring-shaped block 4A as the uppermost stage. As shown in FIG. 21, after carrying in the furnace top ring-shaped block 4A, the next upper ring block 4B is carried in. In this embodiment, the furnace top ring-shaped block 4A and the upper ring-shaped block 4B are temporarily connected via the coupling tool 13 and are suspended and supported by the suspended jack 3a. As shown in FIG. 22, the furnace top ring-shaped block 4A and the upper ring-shaped block 4B supported by the suspension-type jack 3a are lifted up, and the next lower ring-shaped block 4C is further carried into the lower space. These are supported by a suspension type jack 3b different from the above.

  Next, as shown in FIG. 23, the lower ring-shaped block 4C is lifted up by another suspension jack 3b, and the furnace bottom ring-shaped block 4D as the lowermost stage is carried into the lower space. . The lower ring-shaped block 4 </ b> C and the furnace bottom ring-shaped block 4 </ b> D are preferably temporarily connected and suspended and supported via a variable coupling tool 13. Since the lower ring-shaped block 4C and the furnace bottom ring-shaped block 4D are suspended and supported via the variable connector 13, they can be moved in the horizontal direction. Installation and centering on the 4D caisson 5 can be performed easily and quickly. Moreover, when the centering of the lower ring blocks 4C and 4B is also suspended and supported by the furnace top ring block 4A by the variable connector 13, any of the ring blocks can be easily moved in the horizontal direction. After all, the centering of the upper ring-shaped block and the lower ring-shaped block can be easily performed.

  Further, when the transport carriage 15 is used without using the ramp 6 shown in FIG. 23, the bottom of the furnace is placed on the level adjustment frame 17 that can be adjusted to the same height as the caisson 5, as shown in FIG. The ring-shaped block 4D is mounted and conveyed. The bottom ring-shaped block 4 </ b> D is mounted on the carriage 20, and the carriage 20 travels on the traveling rail 18. The lower ring-shaped block 4C is lifted up by the suspension jack 3b, and the furnace bottom ring-shaped block 4D which is the lowermost stage moves on the rail 19 and is carried into the lower space. The lower ring-shaped block 4C and the furnace bottom ring-shaped block 4D can be temporarily connected via the variable coupling 13 to be suspended and supported.

In the present invention, a new blast furnace may be constructed in the following embodiment.
FIG. 25 shows an example in which the ring-shaped block is divided into three to be 4A, 4B, and 4C. Temporary connection by the variable coupler 13 is performed between the ring-shaped blocks 4A and 4B. When the bottom of the furnace bottom ring-shaped block 4C, which is the lowermost stage, is different from the height of the transport carriage loaded in the transport carriage 15 (also referred to as a unit dolly) and the height of the caisson where the furnace body is installed, a general level adjustment frame 17 is provided. The bottom ring-shaped block 4 </ b> C is transported through. From the position of the transport carriage to the caisson 5, it can be moved and installed on the rail 19 installed on the caisson 5 via the rail 18 arranged on the frame as shown in the figure. What is necessary is just to extract after installation of the block 4C. In addition, instead of the rail, an air caster capable of moving a heavy object and finely adjusting the installation position can be used.

  The centering installation of the upper ring-shaped block 4B to the lowermost furnace bottom ring-shaped block 4C can be performed by a parallel movement method by pushing the ring-shaped block 4B to the left and right, as described above. In the configuration in which the ring-shaped block is divided into three parts, the ring-shaped block 4B that can be translated in parallel is positioned above the furnace bottom ring-shaped block 4C that is installed only by movement, and the centering is quick and easy. After centering installation of the ring-shaped block 4B, the ring-shaped block 4A is mounted on the ring-shaped block 4B. Thereafter, the ring-shaped blocks 4A and 4B and the ring-shaped blocks 4B and 4C are welded to complete the assembly of the furnace body. The ring-shaped blocks 4A and 4B are temporarily connected by the variable coupler 13, but for the sake of safety, it is also possible to use a suspension jack 3c of the ring-shaped block 4B indicated by a broken line in the drawing. Centering by parallel movement can be adjusted by causing the suspension load to be borne mainly on the variable connector 13 side during centering.

In addition, the welding connection of the iron skins 7 and 8 and the centering operation of each of the ring-shaped blocks 4A to 4C above the furnace-bottom ring-shaped block 4D, which has conventionally been time-consuming, are performed in the furnace in the furnace-bottom ring-shaped block 4D. The bottom brick can be carried out in parallel with the stacking operation. As a result, conventionally, the work for stacking the furnace bottom bricks required 20 to 30 days. However, according to the present invention, the centering work and stacking work above the lower ring-shaped block 4C can be performed within this period. Since welding connection between each ring-shaped block 4C and 4D can be performed, a margin can be made in a construction period.
Further, in the example of the three divisions of the ring-shaped blocks 4A, 4B, and 4C, after the centering and installation of the furnace bottom ring-shaped block 4C, the ring-shaped block 4B is immediately centered and installed with respect to the furnace bottom ring-shaped block 4C. It becomes possible.

  Incidentally, FIG. 26A is an example of such a variable connector 13, and has a parallel link structure in which a pair of brackets 11 and 12 and a connecting member (rod) 13a are combined, and FIG. These show the example of the wire clamp apparatus 13b which used the wire as the connection member 13a. FIG. 26 shows an example of temporary connection by a type of wire clamp device in which the wire is clamped and held in the brackets 11 and 12 and the wire unit is tightened and fixed hydraulically.

  The connection of the ring-shaped blocks 4A and 4B by the various connecting tools 13 including the variable type is only a temporary connection (linkage), and is only for supporting the load of the upper ring-shaped block 4B below the connection portion. This eliminates the need for centering. Therefore, these operations can be completed within one hour. In this respect, the construction period can be greatly shortened as compared with the conventional case in which it takes 10 to 20 hours to connect the new furnace block.

  In the past, refurbishing of the blast furnace has been carried out continuously day and night by arranging dozens of welding workers around the iron skin. On the other hand, according to the method of the present invention, such work is no longer necessary and normal work may be performed, and therefore work quality is improved. Furthermore, if the furnace body is centered or the furnace bottom ring-shaped block 4D is aligned with the core on the caisson 5, then it is only necessary to sequentially align with this core. It can be eliminated and installation accuracy is improved.

  In the above description, the ring-shaped block construction method provided with the ramp 6 that is the same level as the caisson 5 has been described. However, in the case where the level of the caisson 5 is high and it is difficult to provide the ramp, as shown in FIG. The level adjustment frame 17 is provided on the transport carriage 15 and the rails 18 are laid thereon. At the same time, the in-furnace rails 19 having the same level as the rails are also laid on the caisson 5. A method may be used in which a carriage 20 is placed on 19 and each furnace ring-shaped block 4A to 4D is placed on the carriage 20 to carry out and carry in the ring blocks of the new and old furnace bodies. In this way, by connecting / disassembling the ring-shaped block of the old furnace body and carrying-in / connecting the ring-shaped block of the new furnace body, The renovation and construction process can greatly shorten the conventional construction period.

  The blast furnace refurbishment or construction method according to the present invention can be used not only in the case of the above-described ring-shaped block method, but also as a modification-construction technology in other technical fields having basically the same configuration. .

DESCRIPTION OF SYMBOLS 1 Furnace support | pillar 2 Upper attachment rod 3, 3a, 3b Suspension-type jack 4 Furnace bodies 4A-4D Ring-shaped block 5 Caisson 6 Rampway 7, 8 Iron skin 9 Stave 10 Refractories 11, 12 Bracket 13 Connection tool (variable connection) Ingredients)
13a Connecting member 13b Wire clamp device 14 Cutting part 15 Conveying carriage 16 Nut 17 Level adjusting frame 18, 19 Rail 20 Dolly 21 Groove processing part

Claims (8)

When assembling a new blast furnace body and constructing a blast furnace furnace body by stacking the ring blocks for the new furnace body obtained by dividing multiple places in the height direction sequentially from the top one,
Alternatively, the old furnace body of the existing blast furnace is cut at multiple points in the height direction, the resulting ring-shaped blocks are sequentially removed from the lower one and disassembled, and then the multiple points in the height direction are divided. When refurbishing the blast furnace furnace body, the ring-shaped blocks for the new furnace body obtained in this order are sequentially collected from the top and stacked to assemble the blast furnace furnace body.
Prior to welding connection or cutting of ring-shaped blocks in the new furnace body assembly process or old furnace body disassembly-assembly process, the connection part or cutting part between the upper and lower ring blocks is previously connected with a coupler. A method of constructing or refurbishing a blast furnace furnace body characterized in that the lower ring-shaped block is suspended and supported by the upper ring-shaped block by temporary connection. In the process of assembling the new furnace body during construction, first connect the lower end of the ring-shaped block that will be located in the upper stage to be newly loaded and the upper end of the ring-shaped block that will be located in the lower stage by attaching a connecting tool. Next, the upper and lower ring blocks are stacked together to assemble the furnace body, and then the upper and lower ring blocks are centered and welded together. A method of constructing or refurbishing a blast furnace furnace body according to claim 1. In the old furnace body dismantling process for repair, when the old furnace body is dismantled, a plurality of portions along the cutting line between the lower ring-shaped block at the lower level and the upper ring-shaped block positioned at the upper level are disposed. At the location, during cutting or prior to cutting, a connecting tool is attached in advance to temporarily connect these blocks, and then cut completely along the cutting line without leaving an uncut portion, by cutting the connector during unloading disconnect the respective ring blocks sequentially, the method of construction or renovation of blast furnace body according to claim 1, characterized in that to perform the discharge. Temporary connection between the upper and lower ring-shaped blocks by the coupling tool during assembly or disassembly is performed between a pair of brackets formed of a plurality of sets fixed along the furnace circumferential direction of the connection portion or the cutting portion. The method for construction or refurbishment of a blast furnace body according to any one of claims 1 to 3, wherein the method is performed by using a variable connector provided with a connecting member attached to be horizontally movable. The method for constructing or refurbishing a blast furnace furnace body according to claim 4, wherein the variable connector constitutes a parallel link mechanism with a bracket and a connecting member. 6. The method for constructing or refurbishing a blast furnace furnace body according to claim 5, wherein the connecting member is made of a flexible material. The method for constructing or refurbishing a blast furnace furnace according to claim 5, wherein the connecting member comprises a rod. The method for constructing or refurbishing a blast furnace furnace body according to claim 6, wherein the flexible material is a wire or a chain.

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