JPS6138247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a repair formwork with anchors for reliably repairing damaged parts of a blast furnace lining under hot conditions.

In the conventional spraying method used as a hot repair method for blast furnace linings, the coarse particles of the sprayed material tend to cause rebound loss, while the fine particles tend to scatter and become losses, with the combined loss reaching up to 20%. Also,
With the press-fit method, it is difficult to accurately locate the damaged area, and the press-fit hole is often misaligned, resulting in a complete failure to complete the intended repair. Furthermore, with conventional spraying and press-in methods, it is difficult to provide anchors with an appropriate shape to support the installed monolithic refractories, and it is not possible to install them sufficiently. However, the durability was poor.

The present invention solves these drawbacks, operates the blast furnace on a reduced scale, as detailed below, accurately knows the damage status and position of the blast furnace lining in the hot state, and performs accurate measurement with less loss. The purpose is to provide a formwork with repair anchors that can be repaired.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The gist of the present invention is as specified in each of the claims, and one embodiment of a repair method using the anchored formwork of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Fig. 1, the furnace contents 2 in the blast furnace 1
The scale is reduced to 1 to 2 m below the damaged area of the furnace wall 3, and the scale is lowered at a speed of about 1.2 m/hr. The maximum reduction distance is about 16 m from the stock line in terms of blast furnace operation. In addition, the rise in temperature at the top of the furnace during scale reduction is suppressed by water sprinkling at the furnace mouth and charging water. Observe the exact location of the exposed damaged area 3 on the furnace wall and remove the damaged area 3.
A required number of openings 4 penetrating from the outside of the furnace to the inside of the furnace are provided, and a formwork support metal fitting 5 with a hook-shaped tip is inserted into the furnace through the openings 4. A crane, hoist, winch, etc. 7 is used to hang the side plate 10 (depending on the degree of damage at the damaged area 3) on both sides and the bottom surface as shown in FIG. Place the formwork 9 with the anchors 11 (determining the width) into the furnace, bring it close to the damaged area 3,
The hook of the formwork support hardware 5 is hooked onto the frame 1, the formwork 9 is drawn close to the damaged area 3, and a nut 20 is screwed into the threaded part 12 of the formwork support hardware 5 and fixed to the iron skin 14. At least two formwork supporting metal fittings 5, upper and lower, are prepared for each formwork 9. Further, a blind cover 15 is provided in the opening 4 by bolting, welding, etc. to prevent leakage of the gas in the blast furnace 1. Heat-resistant felt 13 is attached to both sides and lower side plates of the formwork 9 in order to improve the closeness with the remaining lining of the damaged area 3.

The monolithic refractory is poured into the formwork 9 through a pouring port 16 that penetrates from the outside of the furnace to the inside of the furnace at the top of the damaged area 3.
and into the gap between damaged area 3. Alternatively, in the case of the upper part of the shaft of the blast furnace 1, the monolithic refractory is poured into the gap between the formwork 9 and the damaged area 3 using a jute (not shown) through an opening 6 such as an armor hole or a manhole. These operations are repeated in the circumferential direction of the blast furnace. The gap between the formworks 9 is made by inserting the refractory spray pipe 17 into the furnace through the opening 6 of the armor hole, manhole, etc. at the top of the blast furnace 1, either at the same time as the pouring work or after the pouring work is completed. Then, spray the monolithic refractories. The monolithic refractory used was a viscous castable refractory (chemical composition Al ₂ O ₃ 39%,
SiO ₂ 47%). In addition, 18 is 19 on the work floor.
is a pulley.

In addition, regarding the formwork with anchors for repair of the present invention, regardless of the specific structure described above, a plurality of anchor members are provided outside both sides of the box whose top surface and the side surface facing the construction surface are open, and the box A structure may be provided in which a plurality of anchor members are provided inside the body toward the open side surface.

When the damaged part 3 of the blast furnace lining is repaired using this construction method, it is possible to accurately make an opening 4 in the damaged part 3 from the outside of the furnace as shown in Fig. The frame 9 can be accurately and tightly attached to the damaged area 3 by the formwork support hardware 5, and compared to all-spraying construction, by using pouring construction in combination, the rebound loss rate relative to the total construction amount can be reduced. Can be reduced. Furthermore, since the anchors 11 having an appropriate shape to support the constructed monolithic refractory are sufficiently and firmly fixed, the durability of the constructed monolithic refractory is good.

As described above, according to the present invention, damaged parts of the blast furnace lining can be reliably repaired while hot, and the life of the blast furnace can be greatly extended.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view illustrating a repair method using the anchored formwork of the present invention, Fig. 2 is a perspective view of the anchored formwork of the present invention, and Fig. 3 is an arrow A in Fig. 1 after the repair is completed. View. In the figure, 1 is the blast furnace, 2 is the contents in the furnace, 3 is the damaged area, 4 is the opening, 5 is the formwork support hardware, 6 is the opening for armor holes, manholes, etc., 7 is the crane, hoist, winch, etc. , 8 is wire, 9 is formwork, 10
is a side plate, 11 is an anchor, 13 is a heat-resistant felt,
14 is the shell of the blast furnace, 15 is the blind lid, 16 is the pouring port, and 17 is the refractory spray pipe.

Claims (1)

[Claims] 1. Anchor members are provided on the outside of both sides of a box whose upper surface and side surfaces that are in contact with the construction surface are open, heat-resistant felt is attached to the edge of the open side, and anchor members are installed inside the box toward the open side. Formwork with anchors for hot repair of blast furnace lining with parts installed.