JPH0510682A - Spraying method for oblique ceiling - Google Patents

Abstract

PURPOSE:To obtain high charging properties by forming a truncated conical integral material covering the uneven outer surface of a refractory supporting structure, and then mounting it in a frame. CONSTITUTION:A charging coating refractory layer 2 made of tapered aluminum is formed in a state covering the outer uneven periphery of a hanger brick body C by feeding or spraying in such a manner that the outer surface is formed in a truncated conical state. A hanger brick 1 formed with the tapered layer 2, is set to a frame plate B made of a refractory insulator, and alumina refractory material E is sprayed from a spray nozzle D to form a structure F. In this case, the upper plate B is formed of a refractory insulator, thereby eliminating removal of the upper plate after the structure F is formed. Further, when the plate is removed, the refractory material is not damaged, and processing of the insulator after the plate is removed, is also eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for spraying a refractory material directly onto an inclined ceiling portion without a furnace shell such as an iron shell in an industrial furnace such as a heating furnace.

[0002]

2. Description of the Related Art As a construction method for a sloping ceiling of a heating furnace,
Instead of the pouring construction method described in Japanese Utility Model Publication No. 55-153595, recently, for example, Japanese Unexamined Patent Publication No.
As described in Japanese Patent No. 4847, a spraying construction method using a refractory material excellent in strength of a construction body and excellent in adhesion to a base material brick is being adopted. This spraying construction is
Compared with pouring construction, it has the advantages that it does not require a pouring frame, has a short curing time, has excellent stability during drying, and can significantly shorten the construction period.

[0003]

However, when this spraying is applied to an inclined ceiling portion A without a steel shell such as a steel shell, as in the case of a soaking furnace for steel ingots shown in FIG. Cause difficulties.

FIG. 4 is an enlarged view of the portion X in FIG. In forming a sloping ceiling portion by spraying a refractory material, a hanger brick C for holding a refractory material is set on a frame plate B attached to the outer surface of the refractory material, and a refractory material E is blown from the spray nozzle D on the inner surface side of the frame body B. To form a construction body F in which the hanger brick C is buried. At that time, the hanger brick C has an uneven surface formed on the outer periphery in order to support the construction body. However, in the case of spraying, the refractory material E from the nozzle D is sprayed from the lateral direction onto this uneven surface. Therefore, the filling property of the refractory material in the uneven portion is inferior, and a strong construction body cannot be obtained. This lack of filling property also causes cracks and peeling from that portion at the time of temperature rise or at the end of temperature rise.

An object of the present invention is to provide a means for obtaining a high filling property in spraying a refractory material to a ceiling portion of a heating furnace, particularly a portion where a holding brick portion having an inclined and uneven surface is arranged. Especially.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a refractory support structure having an uneven surface on its outer surface is attached to a frame body disposed outside the ceiling, and is attached so as to project inwardly of the frame body, and then fireproof. In the method of forming a refractory lining in a state in which the refractory support structure is embedded by spraying a thing, after covering the uneven surface of the outer surface of the refractory support structure to form an outer cone-shaped integral body, It is characterized in that it is attached to the frame.

[0007]

[Function] The integral coating of the support is set in a "casting" state with no surface irregularities, and the refractory is sprayed onto it, so there is no blind spot in the spraying, and it must be a dense spraying body. You can In addition, since the integrated covering body of the support becomes an integrated structure with the construction body after construction even if the surface irregularities are removed, the sufficient support function of the ceiling construction body due to the uneven surface is not lost, and the integrated cast gurney By forming the outer surface of the body into a frustoconical shape that is wide toward the inside of the ceiling, its outer shape has a function of supporting the spraying work body.

[0008]

EXAMPLE An example in which the present invention is applied to the hanger brick C of the ceiling inclined portion A of the ingot soaking furnace shown in FIG. 3 will be shown.

FIG. 1 shows a hanger brick 1 with integrated coating according to the present invention.

In the figure, a filling and covering refractory material layer 2 made of alumina having a taper is formed by pouring or spraying so as to cover the uneven outer peripheral surface of the hanger brick main body C, and the outer surface has a truncated cone shape.

FIG. 2 shows a state in which the hanger brick 1 with integrated coating shown in FIG.

The hanger brick 1 on which the taper-filled refractory material layer 2 with a taper is formed is set on a frame plate B made of a refractory heat insulating material, and an alumina refractory material E is sprayed from a spraying nozzle D to form a work body F. Form. At this time, by constructing the upper frame plate B with a refractory heat insulating material, it is not necessary to remove the upper frame plate after forming the construction body F, and it is possible to damage the sprayed refractory when removing the upper frame plate. There is no need to install heat insulating material after removing the upper frame plate.

[0013]

According to the present invention, the following effects can be obtained.

(1) Since there is no unevenness on the surface of the refractory support structure to be buried as in the case of conventional spraying to the ceiling, the filling property can be improved without performing a complicated nozzle operation.

(2) The refractory support structure can be formed in an arbitrary shape such as a taper, and while maintaining the effect of holding the refractory material, the narrow portion filling property is excellent and a dense construction body can be formed. The effect of preventing cracks and peeling at the time of temperature rise is brought about.

(3) Since the spraying on the complicated uneven portion is unnecessary, the construction period can be shortened.

[Brief description of drawings]

FIG. 1 shows a cross-sectional structure of a refractory support structure used in the present invention.

FIG. 2 shows a construction aspect of the present invention.

FIG. 3 shows an outline of a soaking furnace for steel ingots as an example of a heating furnace to which the present invention is applied.

FIG. 4 shows a structure of a conventional refractory construction portion of a ceiling portion by spraying.

[Explanation of symbols]

A Inclined ceiling part B Frame plate C Refractory support structure (hanger brick) D Spray nozzle E Spray refractory F Spray work 1 Integrated refractory support structure (hanger brick) 2 Coated refractory layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Joji Yokomizo, No. 3, Hikari, Oshima, Kashima-machi, Kashima-gun, Ibaraki Kurosaki Ceramics Co., Ltd. Kashima Sales Office (72) Gensuke Muta, No. 3, Oji, Kashima-machi, Kashima-gun, Ibaraki Sumitomo Inside the Kashima Steel Works, Ltd. (72) Nobuyoshi Hiroki, No. 3 Hikari, Kashima-machi, Kashima-gun, Kashima-gun, Ibaraki Prefecture (72) Inside the Kashima Steel Works, Sumitomo Metal Industries, Ltd. (72) Yuji Saito, Hikari-tsu, Kashima-machi, Kashima-gun, Ibaraki Prefecture No. 3 Sumitomo Metal Industry Co., Ltd. Kashima Steel Works (72) Inventor Masato Miyazaki No. 3 Hikari, Kashima-cho, Kashima-machi, Kashima-gun, Ibaraki Prefecture Sumitomo Metal Industry Co., Ltd. Kashima Works

Claims (1)

Claim: What is claimed is: 1. A refractory support structure having an uneven surface on the outer surface thereof is attached to a frame body arranged outside the ceiling, and the refractory body is attached to the frame body so as to project inward. In a method of forming a refractory lining in a state in which the refractory support structure is embedded by spraying, after forming an uneven surface of the outer surface of the refractory support structure to form a frustoconical integral body, Spraying method for the sloping ceiling of the heating furnace attached to the frame.