JP2006307319A - Method for transporting mantel of furnace bottom for blast furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for stably transporting the mantel of the furnace bottom for a blast furnace, which has increased weight after brick has been mounted thereon previously at a place other than the base of the blast furnace, onto the base of the blast furnace. <P>SOLUTION: This transporting method comprises the steps of: arranging a balance beam 16 with a thickness (A) of 700 to 2,200 mm, and mounting a laying beam 12 with a thickness (H) of 480 to 1,000 mm on the top face, when constructing the mantel of the furnace bottom for the blast furnace at the place other than the base of the blast furnace; constructing the mantel of the furnace bottom on the laying beam 12; and mounting bricks 9 and 10 on the mantel of the furnace bottom. When transporting it onto the base of the blast furnace, a bending amount of the top face of the bricks constructed in the furnace is controlled to 3 mm or less per meter of a mantel radius. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a transfer method of constructing a blast furnace body in advance in a place other than the blast furnace foundation, and transporting the blast furnace onto the foundation after dismantling of the existing furnace body. The present invention relates to a method for transporting a bottom mantel for a blast furnace that transports a blast furnace to a blast furnace foundation.

  In the conventional blast furnace refurbishment, an old blast furnace (old blast furnace) is divided into small pieces and removed from the blast furnace foundation, and then a new blast furnace is formed by welding the strip-shaped iron skins one by one on the foundation. The main body was installed, and then a method of building bricks in the furnace was adopted, in other words, a method of constructing a new blast furnace from scratch. For this reason, the conventional construction method requires a long time for refurbishment, and it is necessary to install a cooling device such as a stave cooler or cooling pipe after installation of the blast furnace body, which has problems in terms of safety and security and construction quality. .

On the other hand, in recent years, in order to shorten the construction period, in parallel with the operation of the old blast furnace, the new blast furnace is divided into a plurality of ring-shaped blocks at another nearby location (ground assembly site) and the blocks are assembled at the same time. After the old blast furnace has been completely removed from the foundation, these blocks are loaded using a large-scale heavy-duty carriage such as a dolly and are installed by lifting them with jacks, cranes, etc. A so-called block construction method is adopted in which a pipe and a pipe are integrated by welding (for example, see Patent Documents 1 to 3).
For example, Patent Document 1 discloses that a blast furnace is divided into a furnace bottom part, morning glory part, furnace belly part, furnace chest part, furnace port part, and the like, and each of the divided parts is sequentially used for each part around the blast furnace. It has been disclosed to move and stack in the horizontal direction and combine them together to form a single unit, thereby shortening the construction period of the blast furnace.

  As mentioned above, shortening the work period in blast furnace refurbishment is a technology that has been studied for a long time, but it is difficult to apply to actual equipment because it is a large structure and heavy weight, and various companies still consider various methods and apply for patents. There are also many. For example, in Patent Document 2, when dismantling or rebuilding an existing blast furnace, (a) the furnace body is divided into several ring-shaped blocks from the top to the bottom of the furnace, and each is constructed at a place other than the blast furnace foundation. (B) Giving a brick stacking part warp and distortion prevention means and a roundness securing means to the blocks other than the bottom furnace bottom block among the ring-shaped blocks, (c) On the other hand, bricks are piled on the bottom plate installed at the lower end of the furnace bottom block, and (d) the ring block except the furnace bottom block is lifted up after being transported on the foundation by lateral feed. (E) The furnace bottom block is transported and installed on the foundation by cross feed, and then joined to the upper block. Short-term renovation and construction method of the blast furnace has been disclosed by the extent.

Patent Document 3 discloses a blast furnace in which an existing furnace body of a blast furnace is divided into a plurality of ring blocks from the top of the furnace to the bottom of the furnace and disassembled, and a similar ring block is created to assemble a ring block on a blast furnace foundation. In the method of building a furnace body, a lifting device that raises and lowers the ring block of the furnace body is installed in a place other than the blast furnace foundation, and a carriage that loads the load level adjustment frame so that the load level is matched with the blast furnace foundation level. After transporting to the suspension device and supporting the ring block by the suspension device, the load level adjustment frame is removed, and the ring block is lifted down to a level at which the carriage can be lifted to the minimum. On the other hand, a ring block is constructed at a low level at which the transport cart can be mounted at a minimum, and is suspended by the transport cart. Transport to the changer, lift up to a level where it can move to the blast furnace foundation level by supporting the ring block with the suspension unit, and load the load level adjustment frame to match the load level to the blast furnace foundation level. A method for constructing a blast furnace furnace body that is carried on a cart and transported to a blast furnace foundation is disclosed.
Japanese Patent Publication No. 47-1846 JP 09-143521 A JP-A-10-102778

  The method described in Patent Document 1 is a method in which each divided block is constructed on a scaffold having the same height as the assembly completion height, and is moved and completed for each part after completion using a moving scaffold. The height of the blast furnace body is about 100 m, and the furnace body is divided, and a scaffold is constructed for each divided height and a block is constructed on the scaffold. Even with the divided blocks, the weight reaches several thousand tons, and it is necessary to have a rigidity that can withstand this weight. Further, this scaffold is necessary for each divided block, and the production cost of this scaffold is high.

  In the method described in Patent Document 2, the furnace body that is blocked in a ring shape is moved to the base of the blast furnace, lifted up to join the rings, and finally the furnace bottom block is moved. Complete by mounting on the block. At this time, it is described that bricks are piled on the bottom plate of the furnace bottom block. However, the bottom of the blast furnace has a diameter of 10 to 20 m, and when bricks are stacked on the bottom of the furnace, deformation of the bottom of the furnace is the most important issue, but this important issue is disclosed all at once in this reference. Absent. Therefore, although there was an idea of placing bricks on the furnace bottom block, it was a matter of concern among those skilled in the art how to specifically solve the above problem, and the actual situation was not realized.

  Further, in Patent Document 3, a suspension changing device for raising and lowering the ring block of the furnace body is installed at a place other than the blast furnace foundation, and a load level adjustment frame is loaded so that the load level is matched with the blast furnace foundation level. Although the method of moving to a blast furnace foundation by a transportation carriage is disclosed, no prior construction of bricks on a blocked furnace body is disclosed at all.

  In this way, blast furnace block construction is an essential technology for shortening the work period, but as block construction progresses, the weight of each block increases, and advanced transport technology is required. There is no mention about this.

The present invention has been completed as a result of sincerity studies by the inventor in order to solve the above-described problems, and the gist thereof is as follows.
(1) In the method of transporting the bottom mantel, a blast furnace bottom mantel is constructed in advance in a place other than the blast furnace foundation, and bricks are constructed on the bottom mantel and transported to the top of the blast furnace base. The bottom mantle for blast furnace is transported with a bend amount of 3 mm or less per 1 meter of mantel radius.
(2) The method of transporting a blast furnace bottom mantel according to (1) above, wherein a balance beam having a thickness A of 700 mm or more and 2200 mm or less is installed on the lower surface of the furnace bottom mantel.

(3) A laying beam having a thickness H of 480 mm to 1000 mm is installed on the lower surface of the furnace bottom mantel, and a balance beam having a thickness A of 700 mm to 2200 mm is installed on the lower surface of the laying beam. The method for transporting the blast furnace bottom mantel according to (1) above.
(4) A dolly is connected in the longitudinal direction to form a plurality of dolly rows, and the dolly rows are drawn in parallel into the gap formed between the balance beam and the ground surface, and the length of each dolly row is set to the center. The method of transporting a bottom mantle for a blast furnace according to any one of (1) to (3), wherein the method is arranged such that the number of the bottom mantle is decreased from the row to the end row.

(5) The method for transporting a blast furnace bottom mantel according to any one of (1) to (4), wherein the balance beam has a shape corresponding to a length of a dolly row to which the shape of the balance beam is drawn. .
(6) In any one of (1) to (5), the dolly rows are arranged in parallel so that a distance P between hydraulic cylinders installed in the dolly is 2.5 m or less. The method for transporting the blast furnace bottom mantel as described.
(7) A laser transmitter is installed at an arbitrary position on the top surface of the brick constructed in the furnace bottom mantel, and a plurality of laser receivers are arranged in a straight line at an arbitrary position on the top surface of the brick. The furnace bottom mantel for conveying a blast furnace according to any one of (1) to (6), wherein the furnace bottom mantel is conveyed while measuring a bending amount of a brick upper surface obtained by detecting .
(8) From the amount of vertical displacement detected by the laser receiver, correction is performed to cancel an error caused by the inclination of the laser transmitter caused by bending of the upper surface of the brick, and the corrected vertical displacement is true deflection. The method for transporting a bottom mantel for a blast furnace as described in (7) above, characterized in that the amount is an amount.

  According to the present invention, even if it is a bottom mantel whose weight has been increased by constructing bricks in advance in a place other than the foundation of the blast furnace, it can be stably transported to the foundation of the blast furnace without causing breaks in the joints of the bricks. Can do.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
In FIG. 1, the blast furnace disassembly and repair is performed by cutting a blast furnace body 2 in a horizontal direction, dividing the blast furnace body 2 into a plurality of stages in the vertical direction, and then carrying the blast furnace foundation out of the blast furnace foundation. On the other hand, the newly established furnace body 2 is constructed with a preset number of blocks at a place other than the blast furnace foundation (ground assembly site).

  FIG. 2 is a diagram showing a state in which the bottom mantel 1 constructed in the building site is transported in a block. In the building site where the furnace body is built in advance, the balance beam 16 is erected from the ground surface. The spread beam 12 is placed on the upper surface of the balance beam 16. Between the spread beam 12 and the balance beam 16, an air caster 18 for floating the spread beam can be incorporated. The furnace bottom mantel 1 is constructed on the upper surface of the laying beam 12 configured as described above. 4 and 12 show one aspect of the arrangement example of the air casters 18, the arrangement method of the air casters 18 is not limited to this.

More specifically, an iron skin 7 is erected on the furnace bottom plate 6, a stave cooler 8 is stretched inside the iron skin 7, and a hearth brick 9 is constructed on the upper surface of the furnace bottom plate 6 via a joint material 11. . And the carbon brick 10 is constructed on the upper surface of this hearth brick 9 via a joint. In this state, the weight of the bottom mantel 1 is about 1000 tons or more. In order to construct the bottom mantel 1 on the balance beam 16 installed in the assembly ground, the balance beam 16 is made rigid, It is necessary to prevent mantel deformation.
However, there has been no technology disclosed specifically how to prevent it. Therefore, the present inventors have repeated numerical analysis and experiments by the finite element method, and transported the upper surface of the carbon brick 10 applied to the furnace bottom mantel 1 while suppressing the amount of deflection per mantel radius lm to 3 mm. The knowledge which can be mounted on a foundation and used as it is was obtained.

  In the experiment, as shown in FIG. 3, a miniature brick in which a hearth brick 9 is constructed on a furnace bottom plate 6 via a stamp material 25 and a carbon brick 10 is constructed on the upper surface of the hearth brick 9 via a stamp material 25. The model was adopted. As shown in FIG. 3, the jack 24 was installed in the lower part of the furnace bottom mantel of the mini model, the jack was operated, and the state of the gap between the joint and the stamp material 25 constructed between the carbon bricks was observed. The results are shown in Table 1.

  From the results of Table 1, when the deflection exceeds 3 mm / m, a gap is generated at the joint t, and when the deflection is 3 mm / m or less, there is no occurrence of joint breakage due to expansion and contraction of the joint. Therefore, in order to suppress the deflection on the upper surface of the carbon brick to 3 mm / m or less, a specific study was conducted.

  There are two types of blast furnace bottoms: a blast furnace with a spread beam 12 and a type in which a furnace bottom plate is installed directly on the foundation. FIG. 2 is a schematic diagram of conveying the furnace body with the bottom mantel mounted on the former spread beam. FIG. On the blast furnace foundation, a bottom mantel and a spread beam will be installed. For this reason, the laying beam 12 needs to have rigidity.

  The structure of the spread beam 12 is shown in FIG. As shown in FIGS. 4 (a) and 4 (b), the laying beam 12 is made of H-beams arranged in a cross-beam shape or a lattice shape, and poured in refractory concrete 15 to increase rigidity. FIG. 5 shows the amount of bending of the laying beam configured as described above. If the thickness H of the laying beam is not 480 mm or more, the bending amount 3 mm / m determined in the experiment is exceeded, and it has been found that the laying beam thickness H is required to be 480 mm or more. Moreover, if it exceeds 1000 mm, only a weight will increase and it is not economical.

Next, in FIG. 2, the laying beam is placed on the balance beam. Therefore, the balance beam 16 needs to support the furnace bottom mantel 1 and the laying beam 12 and have rigidity for suppressing the deflection of the upper surface of the carbon brick in the furnace bottom mantel to 3 mm / m or less.
In order to suppress the deflection to 3 mm / m or less, as shown in FIGS. 6 and 7, the thickness A of the balance beam needs to be 700 mm or more, and if it is 700 mm or more, the deflection of the upper surface of the carbon brick is 3 mm / m or less. However, there is a limit to the dolly for transporting the bottom mantel including the balance beam and the spread beam, and the height A of the balance beam is 2200 mm or less.

  Next, as shown in FIG. 8B, a dolly 17 that is a large-scale heavy-duty conveyance cart is used for conveyance from the assembly site to the side of the blast furnace foundation. That is, the dolly 17 is connected in the transport direction (longitudinal direction) to form a plurality of dolly rows, and the plurality of dolly rows formed are drawn in parallel into the gap formed between the balance beam and the ground surface, The balance beam 16 is raised by operating the hydraulic pressure of the dolly and conveyed to the side of the blast furnace base. FIG. 8 (a) shows a furnace bottom mantel constructed with bricks at a building site, (b) shows a furnace bottom mantel conveyed by dolly, and (c) shows a furnace bottom mantel conveyed using an air caster. FIG.

About the length of each dolly row | line | column arrange | positioned in parallel, as shown to Fig.9 (a), it has arrange | positioned reducing the length of a row | line | column as it goes to a terminal row from a center row | line. Since the bottom mantel 1 has a cylindrical shape, the load applied to the dolly can be absorbed in a balanced manner by reducing the length of the dolly line from the center to the end. Further, by setting the distance between the dollies within 2.5 m as the arrangement of the dolly rows, the distance P between the cylinders arranged in the dolly becomes 2.5 m or less, and the distance for supporting the balance beam 16 is 2.5 m or less. It becomes. By setting the support point of the balance beam to 2.5 m or less, it is possible to minimize the deflection of the balance beam and to suppress the portion protruding from the outer diameter of the furnace bottom mantel as much as possible.
As shown in FIG. 9 (b), conventionally, the lengths of the respective dolly rows are generally aligned, but in this case, as the distance from the center of the furnace bottom plate increases, the other parts As compared with the above, since the load from the floor beam 12 and the balance beam 16 installed on the bottom surface of the furnace bottom mantel 1 and the balance beam 16 is not applied, the furnace bottom mantel is greatly deformed through the balance beam.

  Furthermore, it is desirable that the balance beam 16 has a shape corresponding to the length of the dolly row to be pulled. With such a shape, it is possible to evenly distribute the load applied to the dolly, thereby reducing the amount of bending during conveyance.

  FIG. 10 is a schematic view of the reinforcing ring 19 and is disposed on the upper outer periphery of the furnace bottom mantel 1. If the pre-construction part of the brick into the furnace bottom mantel is the hearth brick 9 and the carbon brick 10, since there is an iron skin part of the furnace bottom mantel, the deformation of the furnace bottom mantel iron skin due to the bending of this part (inward) Fall).

  FIG. 11 is a schematic view of the stay material 21 installed on the inner surface of the furnace bottom mantel, and the stay materials 21 are arranged radially. It is placed near the top of the carbon brick constructed in the furnace bottom mantel. This is preferably as close to the top surface of the carbon brick 10 as possible in order to prevent bending of the top surface of the carbon brick as much as possible.

  As described above, the present invention can determine the amount of bending of the brick upper surface constructed in the furnace even if it is a furnace bottom mantel 1 in which the brick is pre-constructed in a place other than the foundation of the blast furnace and the weight is increased. It is an invention completed based on new and useful technical knowledge that does not exist in the prior art that it can be stably transported to the blast furnace foundation without causing breaks in the joints of bricks if transported as 3 mm or less per meter. is there. Therefore, when the furnace bottom mantel 1 is transported using the dolly 17 or the air caster 18 in order to make the stable transport more reliable, the deflection amount of the brick upper surface is measured using a predetermined measuring device. It is desirable to carry it.

  In order to measure the amount of bending of the brick upper surface, a laser transmitter 26 and a plurality of laser receivers 27 for receiving the laser 28 transmitted by the laser transmitter are installed on the brick upper surface constructed in the furnace bottom mantel 1. Is desirable. Originally, when measuring the amount of deformation of the object to be deformed, a transmitter such as a laser is installed at a fixed point as shown in FIG. 17, and a fixed reference point is provided at one fixed point. Generally, the amount of vertical displacement at a measurement point is obtained by relative comparison with the point. However, when measuring the amount of deflection of the brick upper surface constructed in the furnace bottom mantel 1, the object to be measured is located inside the iron shell 7, and the measurement point is observed from an external fixed point. It is difficult to do. In addition, since the object moves from several tens to several hundreds of meters, it can be said that it is impossible to place the transmitter at a fixed point from the viewpoint of the reception capability of the receiver. Although it is possible to measure the amount of bending by a person entering the furnace, it is extremely dangerous to enter the furnace during transportation. Furthermore, the deflection of the brick upper surface changes every moment, and it is impossible to measure it instantaneously by human power.

  Therefore, as shown in FIG. 13A, a laser transmitter 26 is installed at an arbitrary position on the brick upper surface constructed in the furnace bottom mantel 1, and a plurality of laser receivers 27 are also installed at arbitrary positions on the brick upper surface. Is desirable. Thus, by detecting the amount of vertical displacement of the laser received by each laser receiver 27, that is, how much the laser reception position in each laser receiver 27 is displaced in the vertical direction compared to before the mantel transport, the upper surface of the brick is detected. Can be measured. In this case, it is desirable to arrange a plurality of laser receivers 27 on a straight line. By arranging on a straight line, as shown in FIG. 13B, the amount of vertical displacement on the line, that is, the amount of bending of the brick upper surface can be accurately measured.

The laser transmitter 26 is not particularly limited, and a rotating laser shown in FIG. 13A can be used. By using the rotating laser, it is possible to instantaneously detect the amount of vertical displacement that changes every moment. Similarly, the laser receiver 27 is not particularly limited, and a rotary laser displacement measuring device can be used.
Although not shown, it is desirable that the laser reception position data in each laser receiver 27 can be transmitted to an operator outside the furnace by wireless or wired communication means. For example, by connecting each laser receiver 27 and a computer (computer) installed outside the furnace by wireless or wired communication means, the amount of vertical displacement in each laser receiver that changes momentarily by mantel transport, The amount of deflection can be confirmed at any time.
The detection of the vertical displacement amount can be performed by using the laser receiver 27 that can store the laser reception position before the mantel transport and can calculate the difference from the laser reception position that changes every moment. The difference itself may be calculated by a computer (computer) connected by wireless or wired communication means.

  As described above, in the present invention, the laser transmitter 26 and the laser receiver 27 are installed on the upper surface of the brick constructed on the furnace bottom mantel. Therefore, when the upper surface of the brick is bent as shown in FIG. As a result, an inclination is generated in the detector 26, and an error is included in the laser receiving position in each laser receiver 27, and thus in the detected vertical displacement. The error increases in proportion to the distance between the laser transmitter 26 and each laser receiver 27 as shown in FIG. That is, there is a possibility that the measurement error cannot be ignored as the radius of the furnace bottom mantel 1 is increased and the deflection amount is increased. FIG. 15 is an explanatory view showing another form of the arrangement example of the laser transmitter 26 and the laser receiver 27, and an error caused by the inclination of the laser transmitter 26 due to the bending of the upper surface of the brick by arranging in this way. It is possible to perform correction for canceling.

  In this method, a plurality of laser receivers 27 are arranged on the same straight line, and a correction for canceling an error caused by the inclination of the laser transmitter 26 due to the deflection of the brick upper surface is performed from the detected vertical displacement amount. The corrected vertical displacement amount is used as the true deflection amount. Specifically, as shown in Table 2, the laser receiver A (measurement point A) located on the straight line is always set to zero reference. And Then, the value of the laser receiver B installed at the extreme end on the opposite side is read, and the value of the receiver installed in the meantime is corrected by the installation distance L. According to the method, as shown in FIG. 16, it is possible to cancel an error caused by the inclination of the laser transmitter 26 due to the bending of the brick upper surface, thereby making the transportation of the furnace bottom mantel 1 more stable. be able to.

It is a schematic explanatory drawing of a blast furnace. It is a construction schematic diagram of a furnace bottom mantel according to the present invention. It is a schematic explanatory drawing of the experimental mini model. It is sectional drawing which shows the structure of a spread beam typically. It is a graph which shows the relationship between the thickness of a spread beam, and the amount of bending. It is sectional drawing which shows the structure of a balance beam typically. It is a graph which shows the relationship between the thickness of a balance beam, and the amount of bending. (A) is a furnace bottom mantel in which bricks are constructed at a building site, (b) is a furnace bottom mantel that is transported in a dolly, and (c) is a view showing a furnace bottom mantel that is transported using an air caster. (A) is explanatory drawing which shows the arrangement | positioning method of the dolly based on this invention, (b) is explanatory drawing which shows the conventional arrangement | positioning method. (A) is explanatory drawing which shows an example of the installation method of a reinforcement ring, (b) is an enlarged view of a reinforcement ring. (A) is explanatory drawing which shows an example of the installation method of a stay material, (b) is an enlarged view of a stay material. It is a schematic diagram which shows one aspect | mode of the example of arrangement | positioning of an air caster. (A) is explanatory drawing which shows one form of the example of arrangement | positioning of a laser transmitter and a laser receiver, (b) is explanatory drawing which shows the deflection amount of a brick upper surface. It is explanatory drawing which shows the error produced by the inclination of the laser transmitter resulting from the bending of a brick upper surface. It is explanatory drawing which shows the other form of the example of arrangement | positioning of a laser transmitter and a laser receiver. It is explanatory drawing which shows the correction method which cancels the error which arises by the inclination of the laser transmitter resulting from the bending of a brick upper surface. It is a schematic diagram for demonstrating the technical significance which installs a measuring apparatus on the brick upper surface constructed in the furnace bottom mantel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Furnace bottom mantel 2 Furnace body 3 Furnace body support pillar 4 Annular pipe 5 Foundation 6 Furnace bottom plate 7 Iron skin 8 Stave cooler 9 Hearth brick 10 Carbon brick 11 Joint 12 Laying beam 15 Refractory concrete 16 Balance beam 17 Dolly 18 Air caster 19 Reinforcing ring 20 Rib 21 Stay material 22 Fixing plate 23 Fastening member 24 Jack 25 Stamp material 26 Laser transmitter 27 Laser receiver 28 Laser A Thickness of balance beam H Thickness of spread beam P Distance between hydraulic cylinders t Thickness of mortar

Claims (8)

In the method of transporting the bottom mantel where a blast furnace bottom mantel is constructed in advance at a place other than the blast furnace base, bricks are applied to the bottom mantle and transported to the top of the blast furnace base, the amount of deflection of the top surface of the brick constructed in the furnace Is transported at a mantel radius of 1 mm or less at a rate of 3 mm or less.
The method for transporting a blast furnace bottom mantel according to claim 1, wherein a balance beam having a thickness A of 700 mm or more and 2200 mm or less is installed on a lower surface of the furnace bottom mantel.
A laying beam having a thickness H of 480 mm or more and 1000 mm or less is installed on the lower surface of the furnace bottom mantel, and a balance beam having a thickness A of 700 mm or more and 2200 mm or less is installed on the lower surface of the laying beam. Item 2. A method for conveying a bottom mantle for a blast furnace according to Item 1.
A plurality of dolly rows are formed by connecting the dollies in the longitudinal direction, the dolly rows are drawn in parallel into the gap formed between the balance beam and the ground surface, and the length of each dolly row is extended from the center row. 4. The method of transporting a blast furnace bottom mantel according to claim 1, wherein the blast furnace mantle is arranged in a reduced manner as it goes in a row. 5.
5. The method for transporting a blast furnace bottom mantel according to claim 1, wherein the balance beam has a shape corresponding to a length of a dolly line to which the shape of the balance beam is drawn.
The furnace bottom for a blast furnace according to any one of claims 1 to 5, wherein the dolly rows are arranged in parallel so that a distance P between hydraulic cylinders installed in the dolly is 2.5 m or less. Mantel transport method.
A laser transmitter is installed at an arbitrary position on the upper surface of the brick constructed in the furnace bottom mantel, and a plurality of laser receivers are arranged in a straight line at an arbitrary position on the upper surface of the brick to detect the vertical displacement of the received laser. The furnace bottom mantel according to any one of claims 1 to 6, wherein the furnace bottom mantel is conveyed while measuring the amount of bending of the brick upper surface obtained in this way.
From the amount of vertical displacement detected by the laser receiver, correction is performed to cancel an error caused by the inclination of the laser transmitter caused by the bending of the brick upper surface, and the corrected vertical displacement is set as the true amount of bending. The method for conveying a blast furnace bottom mantel according to claim 7.

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