JPH0721387B2 - Sloped ceiling spraying method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of spraying a refractory material directly onto an inclined ceiling portion having no 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 furnace shell such as a steel shell, like the soaking furnace of a steel ingot shown in FIG. Cause difficulties.

FIG. 4 is an enlarged view of the portion X in FIG. In forming a sloping ceiling 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. Is sprayed 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 properties 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 a refractory spraying work on a ceiling part of a heating furnace, particularly a part where a retaining brick part 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 the outer surface is attached to a frame body arranged outside the ceiling, and the refractory support structure is attached to the frame body so as to project inward, and then fireproof. In the method of forming a refractory lining in a state in which the refractory support structure is embedded by spraying an object, 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 integral structure with the construction body after construction even if the uneven surface is 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 in a state of covering the uneven outer peripheral surface of the hanger brick body C, and the outer surface thereof has a truncated cone shape.

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

The hanger brick 1 having the taper-filled refractory material layer 2 with a taper 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, since the upper frame plate B is made of a fireproof 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 the retaining effect of the refractory material is maintained, the narrow portion filling property is excellent and a dense construction body can be formed. The effect of preventing cracking 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 Spraying nozzle E Spraying refractory F Spraying construction body 1 Integrated refractory support structure (hanger brick) 2 Coated refractory material layer

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

Claims (1)

[Claims] 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 is attached so as to project inward of the frame body, and then a refractory material is sprayed on the refractory support structure. In a method of forming a refractory lining in a state where a structure is buried, a heating furnace attached to the frame body after forming a conical truncated external body covering the uneven surface of the outer surface of the refractory support structure Method for spraying a sloping ceiling in Japan.