JPH11277191A - Method for working tundish refractory and structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a repairing and replacement time of a tundish refractory by forming in advace a permanent lining or a working lining. SOLUTION: This working method of a tundish refractory is composed of a first process, in which a pre-cast block 7 preformed and divided into plural pieces is combined in a first iron frame 11 and prepared as a permanent lining 2, a second process, in which the first iron frame 11 is fitted in an iron shell 1, a third process, in which monolithic refractory 3 is filled into a gap between the first iron frame 11 and the iron shell 1, a fourth process, in which the first iron frame 11 is fixed with a fixed means 1a arranged at the upper part of the iron shell 1, and a fifth process, in which the working lining is applied at the inside of the permanent lining 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and structure for applying a tundish refractory, and more particularly to a method for forming a permanent or work lining in advance so that new and old linings can be easily replaced at the time of repair. Regarding new improvements.

[0002]

2. Description of the Related Art Generally, when a tundish is used for continuous casting of several hundred charges, it is replaced with a tundish that has been repaired, and a tundish that needs repair is transported to a maintenance yard and repaired. In this case, in order to construct a tundish refractory, the methods shown by A to E in FIG. 9 have been adopted. That is, in the process diagram of FIG. 9, first, in the state of A, a metal for fixing a refractory for a poured work such as a Y-stat 103 is provided on the inner wall 101 a of the steel shell 101,
In the state of B, the perm bricks 102a are laid and piled up on the laying portion and the entire inner wall of the iron skin 101 to form a perm portion, and in the state of C, a substantially box-shaped middle frame 110a is provided inside the perm portion. A work material 106, which is an irregular-shaped refractory, is poured from above into the space between the permanent brick 102a and the middle frame 110a to form a work portion 106a. In the state of D, curing, removal of the middle frame and preparation for drying are performed. In this state, the frame of the burner 107 was inserted from above and dried. In the construction method as described above, hundreds to thousands of bricks must be laid one by one on the inner wall of the iron skin in order to form a permanent part, and the work takes a long time, It was an operation that required skill and considerable effort. As an improvement of this drawback, the present applicant has installed a middle frame inside a steel shell, and press-fits a perm material having fluidity through a press-fitting means into a gap between the steel shell and the middle frame. A method has been devised in which a permanent portion is formed, and a work portion is formed inside the permanent portion via a heat insulating material. This method is disclosed in Japanese Patent Application Laid-Open No. Hei 8-271161.

[0003]

The conventional method for constructing a tundish refractory has the following problems because it is constructed as described above. In other words, since it takes a long time and a high degree of skill to construct a perm part with bricks in a tundish steel bar, the solution was solved by a method of press-fitting a perm member as described in the above-mentioned publication. Attach studs to the steel shell, set the middle frame for permanent refractory permanent construction, and press the irregular refractory into the gap between the middle frame and the steel shell. Although it was shortened, it was necessary to manufacture a middle frame, a mixer to knead the irregular shaped refractory which is a permanent material, a drying facility after the injection of the irregular shaped refractory, etc.Moreover, it was necessary to secure a space for installing these. I was Furthermore, in order to construct a work lining in the same manner as the above-described perm lining, a method of molding with an irregular-shaped refractory has recently been common, so that a middle frame is inserted into a tundish having a perm lining. An irregular-shaped refractory is poured between the frame and the perm lining, and after the refractory is solidified, the frame is deframed and dried before use. Therefore, as in the case of the above-described perm lining, a mixer for kneading the irregular-shaped refractory, a drying facility after the injection of the irregular-shaped refractory, and the like are required, and a space for installing these is required.

The present invention has been made to solve the above problems, and in particular, a tundish refractory in which a permanent or work lining is formed in advance so that a new or old lining can be easily replaced at the time of repair. An object of the present invention is to provide a construction method and a structure of an object.

[0005]

According to the present invention, there is provided a method for constructing a tundish refractory, comprising the steps of: assembling a preformed block divided into a plurality of pieces into a first iron frame to prepare a perm lining; A second step of mounting the first iron frame in the iron shell, a third step of filling a gap between the first iron frame and the iron shell with an irregular refractory, and fixing means provided on the upper part of the iron shell. A method comprising: a fourth step of fixing the first iron frame; and a fifth step of applying a work lining inside the perm lining. Further, a precast block formed in advance and divided into a plurality of pieces is formed by a second iron. A first step of assembling in a frame to prepare a work lining, a second step of mounting the second iron frame on a steel bar on which perm lining has been previously applied, and a gap between the perm lining and the second iron frame A third step of filling the monolithic refractories, and more becomes a method and a fourth step of fixing the second iron frame with fixing means provided in the furnace shell top. Further, the structure of the tundish refractory according to the present invention has a structure having perm lining or work lining by assembling a plurality of pre-formed precast blocks in an iron frame in advance.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and structure for applying a tundish refractory according to the present invention will be described below with reference to the drawings. First, a case where the perm lining 2 composed of a plurality of precast blocks 7 formed in advance using the first iron frame 11 will be described with reference to FIGS. As shown in FIG. 4, a first iron frame 11 which can frame a perm lining 2 for being provided inside the iron shell 1 is manufactured in advance, and is formed into a plurality of pre-formed and manufactured perm linings 2. The precast block 7 is assembled in the iron frame 11 offline. The joint 12 of each precast block 7 has a well-known meshing structure so that each precast block 7 does not shift.

Next, the first iron frame 11 having the precast block 7 is transported by a crane or the like as shown in FIG. The iron frame 11 is mounted in the steel shell 1 in the fitted state. When the mounting is completed, the irregular refractory 3 is poured into the gap between the steel shell 1 and the first iron frame 11 as shown in FIG. When the filling is completed, the first iron frame 11 is fixed to the upper end of the steel shell 1 by using a well-known upper holding metal fitting 1a which is detachable to fix the first iron frame 11.

As described above, when the perm lining 2 composed of the plurality of precast blocks 7 has been mounted on the steel shell 1, the perm lining 2 is formed inside the steel shell 1 via the irregular refractory 3 and the first iron frame 11. 2 is obtained.
After that, work lining is performed on the surface of the perm lining 2. The work lining is performed by setting a middle frame (not shown), which is conventionally performed, inside the perm lining 2, and forming the work with the perm lining 2. A non-illustrated refractory (not shown) may be poured into the gap between them to perform construction. When the pouring is completed, the curd is cured, the middle frame is removed, the tundish is covered, and gas or oil is burned to perform forced drying, whereby the first iron frame 1 shown in FIG.
It is possible to obtain a tundish having a permanent lining 2 and a work lining in which 1 is incorporated. In addition to the method of manufacturing the tundish having the perm lining 2 shown in FIGS. 1 to 4 described above, in the present invention, the work lining 6 shown in FIGS. 7a. That is, in FIG. 5 to FIG. 8, the work lining 6 is applied to the work lining 6 in advance in the frame of the second iron frame 20 smaller than the first iron frame 11, similarly to the perm lining 2 described above. A plurality of the same preformed precast blocks 7a are assembled and the work lining 6 is prepared as shown in FIG. 8, and the second iron frame 20 is placed in a tundish in which the perm brick 2 is applied to the steel shell 1. Is fitted. This second iron frame 2
The gap between 0 and the perm brick 2 is filled with the irregular refractory 3 as shown in FIG. 5 to crush the gap, thereby obtaining a tundish in which the work lining 6 shown in FIG. 7 is formed by the precast block 7a. it can. If a dry material is used for the amorphous refractory 3 and the precast block 7a as the work lining 6 to be filled in the gap, the work can be used immediately without drying after the work lining 6 is applied. A flange 30 is provided around the second iron frame 20 to adjust the position when incorporated into the tundish and to prevent the position after fitting. In each of the above-described embodiments, the perm lining 2 is formed on the first iron frame 11 with the precast block 7 to form a tundish, and the work lining 6 is formed on the second iron frame 20 with the precast block 7a. Although the case where the dish is configured has been described, the invention of claim 3 is a structure in which an iron frame on which these precast blocks are preliminarily installed is attached to a work or a perm lining position. In the embodiments of FIGS. 5 to 8, the same parts as those in FIGS.

[0009]

The construction method and the structure of the tundish refractory according to the present invention are configured as described above, and the following effects can be obtained. That is, in the present invention, the lining of the permanent or the work can be formed by using a plurality of precast blocks that have been previously applied and dried in the iron frame in advance, and it is necessary to repair the tundish refractory. In this case, the old lining and the new lining can be immediately replaced, so that the time required for repairing the tundish can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the tundish of FIG. 3 taken along line AA ′ fitted with a first iron frame having a work lining by a precast block according to the present invention.

FIG. 2 is a sectional view taken along line B-B 'of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a perspective view showing a perm lining in which a precast block is mounted on the first iron frame of FIG. 1;

5 is a cross-sectional view taken along the line CC ′ of the tundish of FIG. 7 fitted with a second iron frame having perm lining by a precast block according to the present invention.

6 is a sectional view taken along line D-D 'of FIG.

FIG. 7 is a plan view of FIG. 5;

FIG. 8 is a perspective view showing a work lining in which a precast block is mounted on the second iron frame of FIG. 5;

FIG. 9 is a process diagram illustrating a conventional construction method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Iron shell 2 Perm lining (composed of precast block 7) 3 Irregular refractory 6 Work lining (composed of precast block 7a) 7 Precast block 7a Precast block 10 Nozzle hole 11 First iron frame 20 Second iron frame

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F27D 1/16 F27D 1/16 F

Claims (3)

[Claims] A first step of assembling a precast block (7) preliminarily formed and divided into a plurality of pieces into a first iron frame (11) to prepare a perm lining (2);
2) mounting the first iron frame (1) in the steel shell (1);
Filling the gap between 1) and steel shell (1) with irregular shaped refractory (3)
A fourth step of fixing the first iron frame (11) with fixing means (1a) provided above the steel shell (1), and a fourth step of constructing a work lining inside the perm lining (2). A construction method for a tundish refractory, comprising five steps. 2. A first step of assembling a preformed and divided plurality of precast blocks (7a) into a second iron frame (20) to prepare a work lining (6), and a perm lining (2) in advance. The second iron frame (20) is installed on the steel shell (1)
And a third step of filling the gap between the perm lining (2) and the second iron frame (20) with the refractory (3).
And a fourth step of fixing the second iron frame (20) with a fixing means (1a) provided above the steel shell (1). 3. A perm lining (2) or a work lining (6) is constructed by assembling a plurality of preformed precast blocks (7, 7a) in an iron frame (11, 20) in advance. Tundish refractory structure.