JP3764275B2 - Method of spraying refractory on ceiling construction surface - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for spraying a refractory onto a ceiling construction surface such as a furnace body.
[0002]
[Prior art]
In the case where an irregular refractory is sprayed on the inner wall surface or ceiling surface of a furnace body or the like, a large number of metal anchors 2 are attached in advance to the construction surface 1 as shown in FIG. Ingenuity to improve the power has been made. This metal anchor 2 is obtained by expanding the tip end side of a metal rod such as a steel bar into a bifurcated shape, and has an effect of preventing the refractory from falling off due to the anchor effect.
[0003]
However, since the metal anchor 2 is made of metal, the coefficient of thermal expansion is different from that of the sprayed refractory. If the furnace body is used for a long period of time, the refractory is cracked from the metal anchor 2 as a starting point. There was a case that things dropped out. In addition, the refractory is sprayed so that the metal metal anchor 2 is not exposed, but there is nothing to be used as a standard for the construction thickness, so it is not easy to make the construction thickness constant, and sometimes a gauge is inserted. It is necessary to spray while confirming the construction thickness. Moreover, there was a problem in that workability was poor because the excess thickness had to be scraped off after construction.
[0004]
On the other hand, when the refractory is poured into the ceiling of the furnace body, a brick anchor 3 as shown in FIG. 4 is used. The brick anchor 3 is made of a columnar refractory having an uneven outer peripheral surface, and has a thermal expansion coefficient substantially the same as that of the sprayed refractory, so that the occurrence of cracks as described above is small. However, since the brick anchor 3 is made of a column-shaped refractory, there is a problem that the refractory that has been blown is poorly circulated in the case of spray construction, and is difficult to use except for pouring onto the ceiling or the like.
[0005]
[Problems to be solved by the invention]
The present invention solves the above-mentioned conventional problems, and can be applied by easily spraying an irregular refractory to a uniform thickness on the ceiling construction surface of a furnace body and the like, and the refractory due to cracks during use of the furnace. It was made in order to provide a method for spraying refractories onto the ceiling construction surface without fear of falling off.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the refractory spraying method of the present invention is made by attaching refractory and columnar brick anchors having an uneven outer peripheral surface to a ceiling construction surface at predetermined intervals. After the metal anchor comprising a shorter metal rod than brick anchor between the anchor and a plurality of closely spaced than the spacing, the brick anchor a thermal expansion coefficient equal refractories, is blown to a thickness of the end face of the brick anchor It is characterized by . In addition, it is preferable that the space | interval of a brick anchor and a brick anchor shall be 1 m or less, and it is preferable to attach a metal anchor with a space | interval of 300 mm or less between a brick anchor and a brick anchor.
[0007]
According to the method of spraying a refractory to the ceiling construction surface of the present invention, since a columnar brick anchor and a metal anchor made of a metal rod shorter than the brick anchor are used in combination, the thickness of the end surface of the brick anchor is reduced. By spraying the refractory, it is possible to easily spray the construction surface with a uniform thickness. In addition, since many metal anchors are used rather than brick anchors, the refractory material can be circulated, and the cured refractory material is securely held by the brick anchor with a small difference in thermal expansion from the refractory material. Even if cracks occur, the refractory does not fall off.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
As shown in FIG. 1, first, a brick anchor 3 and a metal anchor 2 shorter than the brick anchor 3 are attached to the ceiling construction surface 1 of the furnace body at a predetermined interval. As described above, the brick anchor 3 is made of a columnar refractory material having an uneven outer peripheral surface. In the example shown in the figure, the brick anchor 3 has a columnar refractory with an elliptical cross section having a major axis of about 130 mm and a minor axis of about 100 mm. It consists of things. Further, a plurality of tapered step portions 4 that are gradually reduced in diameter toward the tip are formed on the outer peripheral surface. The brick anchor 3 is fixed to the ceiling construction surface 1 by fitting its base portion into the fixing bracket 5.
[0009]
The metal anchor 2 has a refractory holding power increased by expanding the tip side of a metal bar such as a steel bar into a bifurcated shape, and its length is several tens of mm shorter than the effective height of the brick anchor 3. It has become. A plurality of the metal anchors 2 are arranged between the brick anchors 3 at intervals smaller than the interval between the brick anchors 3 and 3 and are fixed to the ceiling construction surface 1 by welding the base portions .
[0010]
It is preferable that the brick anchor 3 is arranged with an interval of 1 m or less between the adjacent brick anchors 3. This is because, in the next refractory spraying process, as shown in FIG. 2, when the refractory is sprayed to the thickness of the end face 6 of the brick anchor 3, it is used as a reference for the construction thickness. If this distance exceeds 1 m, it will be difficult to obtain a uniform construction thickness.
[0011]
Moreover, in order to ensure the holding | maintenance force of a refractory, it is preferable that the space | interval (distance between surfaces) of anchors shall be 300 mm or less. Therefore, in practice, it is preferable to attach the metal anchor 2 between the brick anchors 3 and 3 at intervals of 300 mm or less. In FIG. 1, the distance between the brick anchors 3 and 3 is 900 mm, and the distance between the brick anchor 3 and the metal anchor 2 and the distance between the metal anchors 2 and 2 are both 300 mm.
[0012]
In this way, after the brick anchor 3 and the metal anchor 2 are attached to the ceiling construction surface 1 at a predetermined interval, the refractory is sprayed to the thickness of the end surface 6 of the brick anchor 3 as shown in FIG. It is assumed that the refractory has a thermal expansion coefficient substantially equal to that of the brick anchor. The method for spraying the refractory is not particularly limited. For example, refractory powder such as alumina-silica or silicon carbide-alumina-silica is kneaded with water and pumped. Adopting wet spraying in which a curing agent and high-pressure air are supplied for spraying can provide favorable adhesion. As described above, since the distance between the brick anchors 3 is 1 m or less, a uniform construction thickness can be easily obtained by spraying. Moreover, since the metal anchor 2 is arrange | positioned between the brick anchors 3 and 3, and the refractory material wraps around with respect to these metal anchors 2, it can hold | maintain a refractory material reliably.
[0013]
Moreover, it is inevitable that micro cracks are generated due to the difference in thermal expansion between the metal anchor 2 and the refractory during use of the furnace body, but the refractory constructed by the method of the present invention is different from the refractory in terms of thermal expansion. Since it is also held by the brick anchor 3 without the refractory, there is no possibility that the refractory falls off as in the conventional case.
[0014]
【The invention's effect】
As described above, according to the present invention, the refractory can be easily sprayed and applied to a uniform thickness using the end face of the brick anchor as a reference surface, and the refractory may fall off during use of the furnace. There are no advantages.
[Brief description of the drawings]
FIG. 1 is a side view showing a construction process of the present invention.
FIG. 2 is a sectional view of a construction part according to the present invention.
FIG. 3 is a cross-sectional view showing a conventional example.
FIG. 4 is a cross-sectional view showing another conventional example.
[Explanation of symbols]
1 Construction surface, 2 Metal anchor, 3 Brick anchor, 4 Tapered step, 5 Fixing bracket, 6 Brick anchor end face

Claims (3)

A column-shaped brick anchor made of a refractory with an uneven outer peripheral surface is attached to the ceiling construction surface at a predetermined interval, and a metal anchor composed of a metal rod shorter than the brick anchor is narrower than the interval between these brick anchors. After a plurality of spaced, construction methods spraying refractory bricks anchor a thermal expansion coefficient equal refractory, the ceiling construction surface, characterized in that the spraying to a thickness of the end face of the brick anchor. The method for spraying a refractory onto a ceiling construction surface according to claim 1, wherein a distance between the brick anchor and the brick anchor is 1 m or less. The method for spraying a refractory to a ceiling construction surface according to claim 1 or 2, wherein metal anchors are attached at intervals of 300 mm or less between the brick anchors.

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