JP5699866B2 - Steel chimney cylindrical steel skin repair method - Google Patents

Description

  The present invention relates to a method for repairing a cylindrical iron skin of a steel chimney, and is particularly suitable when a new cylindrical iron skin is attached to the outside of an existing cylindrical iron skin.

  The steel shell of a steel chimney has a refractory attached to the inside to improve heat resistance, but may deteriorate due to long-term use. When the cylindrical iron skin deteriorates as described above, a new cylindrical iron skin may be attached to the outside of the existing cylindrical iron skin. In the following Patent Document 1 and Patent Document 2, when a new cylindrical body skin is attached to the outside of an existing cylindrical body skin, when a refractory is filled outside the existing tubular body skin, for example, a refractory supporting hardware Corrosion resistance is improved by using titanium or titanium clad steel.

Japanese Patent No. 2717575 Japanese Patent Laid-Open No. 5-60319

  By the way, when a new cylindrical iron skin is attached to the outside of the existing cylindrical iron skin and a refractory is filled between the two, a frame material is provided between the existing cylindrical iron skin and the new cylindrical iron skin. And the section is filled with an indeterminate refractory from the outside of the new cylindrical skin. Therefore, it is necessary to form a plurality of steam holes through which the steam generated when the refractory is dried is formed in the new cylindrical iron skin. When there is no hole in the existing cylindrical iron skin, that is, the inner cylindrical iron skin, it is not necessary to close the steam hole of the new cylindrical iron skin, that is, the outer cylindrical iron skin. However, when deterioration of the inner cylindrical skin progresses and a hole is opened in the inner cylindrical skin, the gas inside the chimney may leak to the outside through the gap of the refractory. In such a case, it is necessary to close the steam hole. Moreover, if the deterioration progress of such an inner cylindrical iron skin is predicted, the vapor hole of the outer cylindrical iron skin may be blocked after the refractory is dried. In either case, it is necessary to close the steam hole after the refractory is dried. In addition, when a refractory is filled from the outside of a new cylindrical iron skin, that is, the outer cylindrical iron skin, there is also a problem that it is difficult to check the filling state of the refractory.

  The present invention has been made paying attention to the above-mentioned problems, and when a new cylindrical iron skin is attached to the outside of an existing cylindrical iron skin with a refractory filled therebetween, a new cylinder is provided. It is an object of the present invention to provide a method for repairing a cylindrical steel skin of a steel chimney that does not have a work of closing a vapor hole of the body skin and is easy to check a filling state of a refractory.

  In order to solve the above problems, a steel chimney tubular iron skin repair method of the present invention is a method for repairing a steel chimney cylindrical iron skin, which is a frame material on the outer peripheral surface of an existing cylindrical iron skin. The refractory support hardware is installed inside the frame material, the refractory material is filled inside the frame material from the outside of the existing cylindrical iron skin, and after the refractory is dried, from the outside of the frame material It is characterized by attaching a new tubular skin.

Further, the refractory support hardware is composed of any one of a bar, a strip, and a wire, and the refractory support hardware is installed inside the frame material vertically and horizontally in parallel with the cylindrical iron skin. It is what.
Further, the filling thickness of the refractory is set to 35 to 100 mm.

  Thus, according to the steel chimney cylindrical iron skin repair method of the present invention, when a new cylindrical iron skin is attached to the outside of the existing cylindrical iron skin with a refractory in between, A frame material is attached to the outer peripheral surface of the cylindrical steel shell, a refractory support hardware is installed inside the frame material, and an irregular refractory is filled inside the frame material from the outside of the existing cylindrical steel skin. Because it is decided to install a new cylindrical iron skin from the outside of the frame after drying the refractory, it is not necessary to provide a steam hole for drying the refractory in the new cylindrical iron skin itself. The filling state of the refractory can be easily confirmed visually.

In addition, since the refractory support hardware consisting of any one of rods, strips, and wire rods will be installed inside and outside of the frame material in parallel with the cylindrical iron skin, it will be supported by irregular refractories. Can do.
Moreover, the intensity | strength of a refractory can be ensured, without becoming an excessive weight increase by setting the filling thickness of the refractory to 35-100 mm.

It is a whole front view showing one embodiment of the steel chimney to which the cylindrical iron skin repair method of the present invention is applied. It is a perspective view of the state which attached the frame material to the outer side of the existing cylindrical iron shell of the steel chimney of FIG. 1, and installed the refractory support metal fitting. It is a cross-sectional view of the cylindrical iron skin of FIG. It is a cross-sectional view of a state in which a new cylindrical iron skin is attached to the outside of the cylindrical iron skin of FIG. It is a cross-sectional view of the conventional steel chimney cylindrical iron skin repair method.

Next, an embodiment of the steel chimney tubular iron skin repair method of the present invention will be described with reference to the drawings.
FIG. 1 is an overall front view of a steel chimney to which a cylindrical iron skin repair method of this embodiment is applied. In this embodiment, two steel chimneys 1 are erected on the inside of one steel tower 2, one on the front is a large-diameter steel chimney 1, and the other on the back is a small-diameter steel chimney 1. It is. The cylindrical iron skin repair method of this embodiment demonstrates what was given to these steel chimneys 1. FIG. By the way, this kind of steel chimney 1 is self-supporting, and the steel tower 2 supports the rolling and falling of the cylinder. In addition, a refractory material such as an amorphous acid-resistant castable is lined (lined) on the inner side of the iron skin covering the outer periphery of the cylinder.

  FIG. 2 shows a state in which a frame member 4 is attached to the outer peripheral surface of the existing cylindrical iron shell 3 of the steel chimney 1 of FIG. 1 and a refractory support metal fitting 5 is installed inside the frame member 4. Reference numeral 6 in the figure is an existing refractory lined on the existing cylindrical iron skin 3, and the thickness is not uniform and has deteriorated. In this embodiment, a new cylindrical iron skin is double attached to the outside of the existing cylindrical iron skin 3 where the thickness of the existing refractory 6 is reduced and deteriorated. In addition, you may attach a new cylindrical iron skin not only to the degradation part of the existing refractory 6 but the whole circumference of the existing cylindrical iron skin 3, for example.

  In the present embodiment, first, the horizontal frame member 7 is attached to the entire circumference of the existing cylindrical iron skin 3, and then the vertical frame material 8 is vertically arranged between the horizontal frame members 7 where the new cylindrical iron skin is to be attached. Install it facing. Next, a plurality of refractory-supporting horizontal metal pieces 9 made of a round bar material are arranged between the vertical frame members 8 in the longitudinal direction in the circumferential direction of the cylindrical iron shell 3, that is, in the longitudinal direction in the lateral direction and in the vertical direction. Next, a plurality of refractory-supporting vertical metal objects 10 made of bars such as reinforcing bars are arranged between the horizontal frame members 7 in the vertical direction, that is, in the vertical direction and in the circumferential direction of the cylindrical iron shell 3. To do. For the refractory support hardware 5 such as the refractory support horizontal metal 9 and the refractory support vertical metal 10, rods, strips, wires, etc. are appropriately selected or used in combination. Can do.

  When the refractory support hardware 5 is thus installed in the frame member 4 vertically and horizontally in parallel with the cylindrical iron shell, the refractory material is filled in the frame member 4. FIG. 3 is a cross-sectional view of the cylindrical iron skin 3 in a state where the refractory 11 is filled. In the present embodiment, the refractory material 11 is filled as it is inside the frame material 4 instead of filling the refractory material from the outside of the new cylindrical iron skin, so that the filling state can be visually checked and a uniform filling state is easily achieved. Can be achieved. The filling thickness of the refractory 11 (corresponding to the space between the existing cylindrical iron skin 3 and the new cylindrical iron skin 12) is preferably 35 to 100 mm. When the filling thickness of the refractory 11 is less than 35 mm, the strength of the refractory 11 is insufficient and is easily cracked. Moreover, since the self-weight will increase when the filling thickness of the refractory 11 exceeds 100 mm, it is necessary to reexamine the strength of the entire chimney structure.

  When the filled refractory 11 is dried, a new cylindrical iron skin is attached to the outside of the frame member 4. FIG. 4 is a cross-sectional view of the tubular iron skin 3 in a state where a new tubular iron skin 12 is attached after the refractory 11 is dried. In the present embodiment, after drying the refractory 11, a new cylindrical iron skin 12 is attached to the outside of the existing cylindrical iron skin 3, so it is necessary to make a steam hole for drying the refractory 11 in the new cylindrical iron skin 12. As a matter of course, since it is not necessary to close the steam hole, the work is reduced as compared with the conventional cylindrical iron skin repairing method for closing the steam hole.

  FIG. 5 shows a conventional method for repairing a cylindrical steel skin of a steel chimney. Similar to the present embodiment, a repair method for attaching a new cylindrical steel skin 12 to the outside of an existing cylindrical steel skin 3 is shown. It is an example. In this conventional cylindrical iron skin repair method, the frame material 4 is attached to the outside of the existing cylindrical iron skin 3, and before filling the refractory, a new cylindrical iron skin 12 is attached to the outside of the frame material 4, Thereafter, the refractory 11 is filled from the outside of the tubular iron skin 12 to the new tubular iron skin 12, that is, outside. Therefore, the new cylindrical iron skin 12 needs a steam hole 51 for discharging steam generated when the refractory 11 is dried.

  As described above, when there is no hole in the existing cylindrical iron skin 3, it is not necessary to close the steam hole 51 of the new cylindrical iron skin 12. However, when the deterioration of the existing cylindrical iron shell 3 progresses and the hole is opened, the gas inside the chimney may leak from the vapor hole 51 through the gap of the refractory 11. In such a state, it is necessary to close the steam hole 51. Moreover, when the progress of deterioration of the existing cylindrical iron skin 3 can be predicted, it is necessary to block the steam hole 51 in advance. In any case, an operation of closing the steam hole 51 of the new tubular iron skin 12 occurs. Moreover, since the inside of the new cylindrical iron skin 12 cannot be seen, there also exists a problem that it is difficult to confirm the filling state of the refractory 11.

On the other hand, in the cylindrical iron skin repair method of this embodiment, since it is not necessary to make a steam hole in the new cylindrical iron skin 12, naturally, it is not necessary to close a steam hole, and work is reduced. Moreover, while being able to confirm the filling state of the refractory 11 visually, a uniform filling state can be achieved easily.
As described above, in the steel chimney cylindrical iron skin repairing method of the present embodiment, when the new cylindrical iron skin 12 is attached to the outside of the existing cylindrical iron skin 3 with the refractory 11 filled therebetween, The frame member 4 is attached to the outer peripheral surface of the existing cylindrical iron skin 3, the refractory support hardware 5 is installed inside the frame member 4, and the outer side of the existing cylindrical iron shell 3 is not attached to the inner side of the frame member 4. It is necessary to provide a steam hole for drying the refractory material in the new cylindrical iron skin 12 by filling the regular refractory material 11 and attaching a new cylindrical iron skin 12 from the outside of the frame material 4 after the refractory material 11 is dried. Therefore, it is not necessary to close the steam hole, and the state of filling the refractory 11 can be easily confirmed visually.

In addition, since the refractory support hardware 5 made of any one of a bar, a strip, and a wire is installed inside the frame member 4 in a vertical and horizontal manner in parallel with the cylindrical iron skin, even an irregular refractory 11 is used. Can be supported.
Moreover, the intensity | strength of the refractory 11 can be ensured, without becoming an excessive weight increase because the filling thickness of the refractory 11 was 35-100 mm.

DESCRIPTION OF SYMBOLS 1 is steel chimney 2 is a steel tower 3 is an existing cylindrical iron skin 4 is a frame material 5 is a hardware for supporting a refractory 6 is an existing refractory 7 is a horizontal frame 8 is a vertical frame 9 is a horizontal for supporting a refractory Hardware 10 is vertical metal for refractory support 11 is refractory 12 is new tubular steel skin

Claims (3)

  A method of repairing a tubular chimney of a steel chimney, in which a frame member is attached to the outer peripheral surface of an existing tubular shell, a refractory support hardware is installed inside the frame member, and the existing tubular member A method for repairing a tubular chimney of a steel chimney, comprising filling a refractory into the inside of the frame material from the outside of the iron skin, and attaching a new cylindrical iron skin from the outside of the frame material after the refractory is dried.   The refractory-supporting hardware is made of any one of a bar, a strip, and a wire, and the refractory-supporting hardware is installed inside the frame material vertically and horizontally in parallel with the cylindrical iron skin. The method for repairing a tubular steel skin of a steel chimney according to claim 1.   The method for repairing a tubular chisel of a steel chimney according to claim 1 or 2, wherein a filling thickness of the refractory is set to 35 to 100 mm.

Images