JP6954870B2 - Stave and how to install the stave - Google Patents

Description

The present invention relates to a stave and a method of installing the stave.

In the blast furnace, a large number of cooling stave are installed on the inner side surface of the iron skin. The gap between the stave and the iron skin is filled with an amorphous refractory material (castable). In order to prevent the filled castable from leaking out, a band-shaped sealing material is attached to the joint of the stave (see Patent Documents 1 and 2).
For the stave arranged at the bottom, a seal plate is installed on the lower surface side thereof, and the outer edge of the furnace is extended to the iron skin to seal the gap between the stave and the iron skin.

JP-A-2007-291456 Japanese Unexamined Patent Publication No. 2011-214076

When installing a new blast furnace, the work of installing the seal plate on the lower surface side of the lowermost stave described above can be performed by the work inside the furnace.
On the other hand, when the stave is renewed during the wind break, the original seal plate has disappeared, and it is necessary to install a new seal plate. Installation of the seal plate when the wind is closed cannot be continued for a long time because the work is performed in the furnace under high temperature and high dust, and there is a problem that the work efficiency is low and the construction period is prolonged. In addition, since there is a concern that CO gas (carbon monoxide gas) may be generated in the furnace during the wind break, the work inside the furnace during the wind break is not preferable from the viewpoint of safety.
On the other hand, as the lowermost stave, a stave with a seal plate fixed in advance on the lower surface side is used, and by arranging this in the furnace, it is conceivable to complete the installation of the seal plate.
However, it is not possible to seal the seam of the sealing plate only by arranging the stave sequentially. For example, it is conceivable to attach a sealing member such as a sponge to the seam of the sealing plate and sandwich the sealing member at the time of installation to seal the seam. However, when the stave is sequentially installed, they may rub against each other and the sealing member may be damaged or fall off. Further, when the gap between the sealing plates becomes large due to the installation error of the stave, the sealing member cannot be sufficiently sandwiched, and the sealing may not be possible.

An object of the present invention is to provide a stave and a method for installing the stave, which can be installed by operating the outside of the furnace and can surely seal the gap on the lower surface side.

The stave of the present invention is fixed to the lower surface side of the stave body and seals the space between the plate-shaped stave body arranged along the inner side surface of the iron skin and facing each other. The seal member is characterized in that the end edge protrudes from the side surface of the stave main body and is inclined with respect to the thickness direction of the stave main body.

In such an invention, the stave main body is fixed to the inner side surface of the iron skin at a predetermined interval and arranged in order. With the fixing of the stave body, the sealing member is arranged so that the sealing members of the adjacent stave and the edges of each other are adjacent to each other. Since the edge of the seal member is inclined with respect to the thickness direction of the stave body (diameter direction of the blast furnace), the stave body is displaced in the thickness direction (diameter direction of the blast furnace) to intersect the thickness direction. The edge of the seal member is displaced in the direction (circumferential direction of the blast furnace), and the distance from the adjacent seal member (distance between the edge edges) can be increased or decreased.
For example, if the edge edges of a pair of adjacent sealing members are inclined at the same angle so as to be parallel to each other, the gap between them can be uniformly increased or decreased by the displacement in the thickness direction of the stave body. Further, if an elastic member is attached to one of the opposite edge edges, the gap between the elastic members can be reliably sealed by sandwiching the elastic member between the pair of edge edges.
At this time, the operation of displacementing the stave body in the thickness direction can be performed by a crane or the like that suspends the stave into the furnace, or can be operated from the outside of the furnace through the opening of the iron skin.
Therefore, it is possible to provide a stave that can be installed by operating the outside of the furnace and can reliably seal the gap on the lower surface side.
The iron skin and the seal member may be sealed by having an elastic member attached to the seal member and sandwiching the iron skin and the seal member at the time of installation. The sealing member or the elastic member may not be in direct contact with the iron skin, but may be sealed between the sealing member or the elastic member through the remaining portion of the existing sealing plate left along the iron skin.

In the stave of the present invention, it is preferable that the end edges of the sealing member on both sides are inclined to the same side.
In such a present invention, since the edge edges on both sides of the seal member are inclined to the same side, by sequentially arranging the stave bodies, the edge edges of the adjacent seal members become parallel to each other, and the edge in the thickness direction described above becomes parallel. Due to the displacement, the distance between the edge edges is uniformly increased or decreased, and a reliable sealing can be performed over the entire length of the edge edge.
It should be noted that the edge of the seal member may be inclined only on one side, for example, when it is installed adjacent to an existing stave. Further, the edges on both sides may be inclined to the opposite sides. However, when arranging them in sequence, it is preferable that the edge edges on both sides are inclined to the same side because the adjustment work becomes uniform.

In the stave of the present invention, the edge side elastic member is attached to the edge of the seal member, and the furnace outer elastic member is attached to the furnace outer edge facing the iron skin of the seal member. preferable.
In such an invention, when the gap between the edge of a pair of adjacent sealing members is increased or decreased, the elastic member on the edge side is sandwiched between the adjacent edges and the gap between them can be reliably sealed. ..
Further, the elastic member on the outer side of the furnace can reliably seal the gap between the outer edge of the furnace and the iron skin of the sealing member. Even when the stave body is displaced in the thickness direction in order to increase or decrease the gap at the edge, the presence of the elastic member on the outside of the furnace can maintain the sealing with the iron skin.
For sealing between the edges and between the edges, for example, a material that expands by heating may be applied to the edges, or the elastic member outside the furnace may be fixed to the iron skin. By mounting each elastic member on the side of the seal member, sandwiching can be performed reliably.

In the stave of the present invention, it is preferable that the seal member has an extension plate that is movably supported along the seal member and can protrude from the edge.
In such a present invention, even when the stave of the present invention is installed in a part of the blast furnace and the conventional stave remains, even when the gap with the conventional sealing member whose edge is not inclined is large. By pulling out the extension plate, hanging it at intervals, and supplementing it with a filler or the like separately, it is possible to seal the gap between the two.

In the method of installing the stave of the present invention, the distance between the plate-shaped stave body arranged along the inner side surface of the iron skin and facing each other and the iron skin fixed to the lower surface side of the stave body. The seal member comprises an intermediate stave, a start end stave and an end stave whose end edges protrude from the side surface of the stave body and are inclined with respect to the thickness direction of the stave body. In the intermediate stave, both the end edges on both sides of the seal member are inclined in the first direction or the second direction opposite to the first direction, and in the start end stave, one end of the seal member is used. The edge is set to the first direction and the other end edge is inclined to the second direction, and in the end stave, one and the other end edges of the seal member are inclined in the opposite direction to the start end stave. , The start end stave is installed inside the iron skin, the intermediate stave is installed next to the start end stave, and another intermediate stave is installed next to the intermediate stave. It is characterized in that the end stave is installed between the start stave and the start stave.

In the present invention as described above, the start end stave to the plurality of intermediate stave are arranged in a state where the end edges inclined in the first direction face each other. In these stave, by displacing the stave body in the thickness direction, the distance between the edges of each other can be appropriately adjusted.
When installing the last terminal stave, on one side the edges inclined in the first direction face each other with respect to the intermediate stave, and on the other side the other intermediate stave or the first stave that has made a round is in the second direction. The inclined edges face each other. Since the first direction and the second direction are opposite to each other, for example, by displace the stave body of the terminal stave toward the iron skin (displace outward in the circumferential direction), the distance from the edge of the intermediate stave. And the distance from the edge of the starting stave can be shortened respectively.
When the first direction and the second direction are in the same direction (for example, the end edges of the start end stave and the end stave are all in the first direction), the stave body is displaced in the thickness direction to cause one interval (for example, the intermediate stave). The distance from the edge (for example, the distance from the edge) will be shortened, but the distance from the other (for example, the distance from the start stave to the edge) will be increased.
In this way, by using the start end stave and the end stave whose inclination directions are opposite to each other, the stave is arranged so as to go around the inside of the furnace, and the gap between the sealing members due to the displacement in the radial direction is sealed. The effect of the displacement of the present invention described above can be obtained.

In the method of installing the stave of the present invention, the distance between the plate-shaped stave body arranged along the inner side surface of the iron skin and facing each other and the iron skin fixed to the lower surface side of the stave body. The seal member comprises an intermediate stave, a start end stave and an extension stave whose end edges protrude from the side surface of the stave body and are inclined with respect to the thickness direction of the stave body. In use, an extension plate that is movably supported along the seal member and can protrude from the end edge is installed in the extension stave, and an existing stave that has been installed inside the iron skin is designated. The remaining stave in the residual section of the above is removed, and the starting stave is installed in a range other than the residual stave in the range where the existing stave is removed, the intermediate stave is installed next to the starting stave, and the intermediate stave is installed. Repeatedly installing another intermediate stave next to the stave, installing the extension stave between the intermediate stave and the residual stave at the other end of the residual section, and installing the extension plate of the extension stave. Is projected toward the residual stave.

In the present invention as described above, the existing stave installed inside the iron skin, such as when the stave of the blast furnace is partially renewed, is removed leaving the residual stave in the predetermined residual section, and the present is applied to the renewal section of the trace. A stave based on the invention can be installed. At this time, the residual stave at one end and the other end of the residual section does not have a sealing member having an inclined edge, but an extension stave is installed adjacent to each, and the extension plate of the extension stave is directed toward the residual stave. By projecting the stave, the gap between the extension stave and the residual stave can be sealed. Intermediate stave can be arranged between one extension stave and the other extension stave. In this way, by sealing the gap with the extension stave for the residual stave, only a part of the inside of the furnace can be arranged. The stave of the present invention can be arranged, and the effect of the stave of the present invention described above can be obtained, such as sealing a gap between sealing members due to radial displacement.
After that, when the residual stave left in the residual section is renewed, since the stave of the present invention is installed in the previously renewed section, the gap between the sealing members due to the inclined edge according to the present invention. Can be sealed.

According to the present invention, it is possible to provide a stave that can be installed by operating the outside of the furnace and that can reliably seal the gap on the lower surface side, and a method of installing the stave.

FIG. 2 is a cross-sectional view showing an iron skin and a stave according to the first embodiment of the present invention. The front view from the inside of the furnace of the iron skin and the stave of the 1st embodiment. An exploded perspective view showing the stave of the first embodiment. The plan view which shows the stave of the 1st Embodiment. An enlarged cross-sectional view showing the seal member of the first embodiment. The plan view which shows the installation state of the stave of the 1st Embodiment. An enlarged plan view showing an end portion of the seal member in the installed state of the first embodiment. The schematic diagram which shows the intermediate stave, the start end stave, and the end stave of the 1st Embodiment. The schematic diagram which shows the 1st state of the installation work of the stave of the 1st Embodiment. The schematic diagram which shows the 2nd state of the installation work of the stave of the 1st Embodiment. The schematic diagram which shows the 3rd state of the installation work of the stave of the 1st Embodiment. The schematic diagram which shows the 4th state of the installation work of the stave of the 1st Embodiment. The schematic diagram which shows the stave of the 2nd Embodiment of this invention. The schematic diagram which shows the 1st state of the installation work of the stave of the 2nd Embodiment. The schematic diagram which shows the 2nd state of the installation work of the stave of the 2nd Embodiment. The schematic diagram which shows the 3rd state of the installation work of the stave of the 2nd Embodiment. An exploded perspective view showing a stave according to a third embodiment of the present invention. The enlarged vertical sectional view which shows the seal member of the 3rd Embodiment. An enlarged plan sectional view showing an end portion of the stave of the third embodiment. The schematic diagram which shows the 1st state of the installation work of the stave of the 3rd Embodiment. The schematic diagram which shows the 2nd state of the installation work of the stave of the 3rd Embodiment. The schematic diagram which shows the 3rd state of the installation work of the stave of the 3rd Embodiment. An enlarged plan sectional view showing an end portion of the stave of the third embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 12 show a first embodiment of the present invention.
In FIGS. 1 and 2, a plurality of cooling stave 3s are arranged along the inner side surface of the iron skin 2 of the blast furnace 1.
The stave 3 has a stave body 10 made of copper or cast iron.
The stave body 10 is fixed to the iron skin 2 by a fixing bolt 11 penetrating the iron skin 2. A predetermined gap is provided between the furnace outer surface 12 of the fixed stave body 10 and the iron skin 2.
A water supply port 13 and a drainage port 14 are formed on the outer surface 12 of the furnace of the stave main body 10, and each of them communicates with a refrigerant passage (not shown) formed inside the stave main body 10. The water supply port 13 and the drainage port 14 are drawn out to the outside of the furnace through the opening 2H formed in the iron skin 2, and are connected to a water supply pipe and a drainage pipe (not shown).

The gap between the stave 3 and the iron skin 2 (the gap between the furnace outer surface 12 of the stave main body 10 and the furnace inner side surface 2F of the iron skin 2) is filled with castable 4 which is an amorphous refractory material.
The castable 4 is obtained by fixing the stave 3 to the iron skin 2 and then filling the gaps between the castables 4 in a fluid state and solidifying the castable 4.

In order to prevent leakage of the castable 4 to be filled, a band-shaped sealing material 6 covering each of the vertical joint and the horizontal joint of the stave 3 is attached.
The sealing material 6 is a thin iron plate 6S on which an elastic body 6E such as a butyl rubber sponge is attached, and even if there is a step in the vertical joint and the horizontal joint of the stave 3, the displacement can be absorbed. ..
On the other hand, in order to prevent the castable 4 from leaking from the gap between the lowermost stave 3 and the iron skin 2 on the lower surface side, the lowermost stave 3 is provided with the stave 3L based on the present invention.

In the blast furnace 1, when the stave 3 was installed last time, a seal plate 2S was provided on the iron skin 2, and the gap between the iron skin 2 and the lower surface side of the lowermost stave 3 was sealed with the seal plate 2S. ..
In the present embodiment, when the stave 3L is installed, the inner portion of the seal plate 2S is cut off, and the remaining portion 2R is left on the iron skin 2. If the remaining portion 2R is worn out during the operation of the blast furnace 1, another member is attached to form the remaining portion 2R again. If there is another residual stave under the bottom stave 3, and the upper surface of this residual stave is worn out, the length can be adjusted by adding the remaining 2R or the like. The gap between the lower stave 3 and the iron skin 2 on the lower surface side can be sealed.

In FIG. 3, the stave 3L has a stave main body 10 similar to the stave 3 arranged in the upper stage, and a seal member 20 fixed to the lower surface 15 thereof.
A sealing material 6 is previously attached to the stave main body 10 along the upper edge and one side edge, respectively. When the stave 3L is installed on the iron skin 2, these sealing materials 6 cover the vertical joints with the side edges of the other adjacent stave 3L and the horizontal joints with the lower edge of the upper stave 3. It is possible to cover the ground. When the stave 3L is installed first and the upper stave 3 is installed later, the sealing material 6 is attached in advance to the lower part of the stave 3 to be attached later, and is placed between the stave 3L and the stave 3L when the stave 3 is installed. It may cover the joints of the lumber.

The seal member 20 has a plate capable of covering the lower surface 15 of the stave main body 10, for example, a steel base plate 21, and the base plate 21 is attached to the lower surface 15 of the stave main body 10 with a plurality of bolts 22.
An upright portion 23 is formed on the inner edge of the base plate 21 in the furnace, and the upright portion 23 is arranged along the inner side surface of the stave main body 10 when the seal member 20 is attached to the stave main body 10.

A steel frame body 24 is fixed to the lower surface of the base plate 21 by welding or the like, and the seal member 20 has a box shape with the lower surface open.
An elastic member 25 (further outer elastic member) is attached to the side surface of the frame body 24 facing the iron skin 2, and an elastic member 26 (end edge side elastic member) is attached to the side surface facing another adjacent stave 3L. ing. The elastic members 25 and 26 are each formed of a butyl rubber sponge or the like, and are fixed to the frame body 24 by a plurality of bolts 251,261, respectively.

In FIG. 4, in the seal member 20, the edge facing the iron skin 2 (specifically, the elastic member 25 and the outer portion of the base plate 21 on the outer side of the furnace) is projected from the outer surface 12 of the stave body 10. There is.
In FIG. 5, when the stave 3L is installed on the iron skin 2, the elastic member 25 protruding from the furnace outer surface 12 of the stave main body 10 is pressed against the remaining portion 2R left on the iron skin 2. Thereby, the gap between the furnace outer surface 12 of the stave main body 10 and the furnace inner side surface 2F of the iron skin 2 can be sealed over the entire width of the stave main body 10.

In FIG. 4, the edge portions 201 and 202 on both sides of the seal member 20 project from the side surface 16 of the stave body 10, and are inclined to the same side with respect to the thickness direction of the stave body 10, so that the planar shapes are substantially parallel. It is a quadrilateral.
In the seal member 20 of the present embodiment, one edge 201 is formed by the edge of the elastic member 25, and the other edge 202 is formed by the edge of the base plate 21 on the opposite side.
In FIG. 6, when the stave 3L is installed on the iron skin 2, the end edges 201 and 202 are pressed against each other. As a result, the gap between the stave main bodies 10 generated on the lower surface side of the stave main body 10 can be sealed.

When the stave 3L is installed on the iron skin 2, the edges 201 and 202 of the adjacent stave 3L are not always in close contact with each other due to the suspension position accuracy of the stave 3L.
On the other hand, in the present embodiment, by moving the stave 3L to the outside of the furnace in order to attach it to the iron skin 2 (displace it in the thickness direction of the stave body 10), the distance between the edge edges 201 and 202 is shortened. , Can be pressed against each other.

In FIG. 7, the stave 3L1 on the left side in the figure is installed first, and then the stave 3L2 on the right side in the figure is installed. The stave 3L2 is in the state of a two-dot chain line in the middle of being suspended, and there is a gap G between the end edge 201 of the stave 3L1 and the end edge 202 of the stave 3L2. It is not in contact with the seal member 20 of the stave 3L2.
Therefore, when the stave 3L2 is further moved to the outside of the furnace to the normal state shown by the solid line, the edge 201 of the stave 3L1 and the edge 202 of the stave 3L2, which are inclined to the same side, come close to each other and eventually become mutual. The gap G becomes 0, and the pressure welding state is further reached. When the elastic member 26 of the end edge 201 of the stave 3L1 is compressed by a predetermined amount, the gap between the stave 3L1 and the stave 3L2 can be sealed.

As a means for displacing the stave 3L2, as shown in FIG. 1, a rod 2P is inserted from the outside of the furnace through the opening 2H of the iron skin 2 formed for inserting the water supply port 13 to suspend the stave 3L2. The lower part of the stave 3L2 in the displaced state can be operated. As a means for operating the lower portion, for example, a fixing bolt 11 for attaching the stave, a water supply port 13 or a drainage port 14 of the stave cooling pipe can be used, and a tool or the like can be inserted from the fixing bolt 11 to move the stave 3L2.
As described above, in the stave 3L2, the elastic member 25 is pressed against the remaining portion 2R left on the iron skin 2 in order to seal the gap between the iron skin 2 and the iron skin 2. When the stave 3L2 is displaced, it is necessary to take care so that the pressure welding of the same portion is maintained. However, in the present embodiment, since the remaining portion 2R is pressed against the remaining portion 2R via the elastic member 25, the pressing contact of the same portion can be maintained as long as an excessive displacement is not applied. When the remaining portion 2R is lost due to wear during the above-mentioned operation, the frame body 24 is extended to the iron skin 2 side by the amount corresponding to the remaining portion 2R, and the iron skin 2 and the elastic member 25 are not used. And may be directly pressed against each other.

By using the stave 3L having the seal member 20 as described above, it is possible to prevent the castable 4 from leaking from the gap between the iron skin 2 and the furnace outer surface 12 of the stave main body 10 or the gap between the stave main bodies 10. can.

[Installation work in the first embodiment]
In the present embodiment, when the blast furnace 1 is renewed, after removing all the old stave 3 that has already been operated from the furnace inner side surface 2F of the iron skin 2, a new stave 3 is installed on the furnace inner side surface 2F of the iron skin 2. When installing the stave 3, the stave 3L of the present invention is installed over the entire circumference of the lowermost stage, and new stave 3 is sequentially installed on the upper stage.
When installing the bottom stave 3L all around, the first stave 3L (starting stave 3LF in FIG. 8) is installed at a predetermined position on the inner side surface 2F of the furnace, and another stave 3L (in FIG. 8) is installed next to it. The intermediate stave 3LM) is installed, and the installation of the stave 3L is repeated in the same manner thereafter. When the stave 3L goes around the inner side surface 2F of the furnace, the last stave 3L (terminal stave 3LE in FIG. 8) is installed between the stave 3L installed immediately before and the first stave 3L.

When the stave 3L installed at the bottom is fixed to the iron skin 2, the stave body 10 is moved to the outside of the furnace where the iron skin 2 is located (shortening the distance from the iron skin 2), so that the stave 3L is immediately before. The edge 201 and the edge 202 are pressure-welded to and from the installed stave 3L. However, for the last stave 3L, it is necessary to press the end edges 201 and 202 against both the stave 3L installed immediately before and the first stave 3L.
Therefore, in the present embodiment, for the first and last stave 3L, those whose edge edges 201 and 202 on both sides are inclined in opposite directions are used.

In FIG. 8, the start end stave 3LF and the end stave 3LE are installed adjacent to each other on the inner side surface 2F of the iron skin 2, and the intermediate stave 3LM is installed in the other area.
In the intermediate stave 3LM, both end edges 201 and 202 of the seal member 20 are inclined in the first direction (clockwise toward the outside of the furnace), and the planar shape is a substantially parallel quadrilateral shape.
In the starting end stave 3LF, one end edge 201 of the sealing member 20 is set as the first direction, and the other end edge 202 is inclined in the second direction (counterclockwise toward the outside of the furnace) opposite to the first direction. , The plane shape is a substantially trapezoidal shape or a fan shape that extends to the outside of the furnace.
The end stave 3LE has a planar shape in which one end edge 201 and the other end edge 202 of the sealing member 20 are opposite to the start end stave 3LF, that is, the end edge 201 is inclined in the second direction and the end edge 202 is inclined in the first direction. Has a substantially trapezoidal shape that extends to the outside of the furnace.

9 to 12 show installation procedures for the start stave 3LF, the intermediate stave 3LM, and the end stave 3LE.
In FIG. 9, when installing the start end stave 3LF, the intermediate stave 3LM, and the end stave 3LE, all the old stave 3 is removed from the inner side surface 2F of the iron skin 2 in advance.
In the blast furnace 1 before the renewal, all of the blast furnace 1 including the bottom stage is the existing stave 3, and the iron skin 2 is sealed to prevent the castable 4 from leaking from the lower surface side of the bottom stage stave 3. Board 2S was installed. When renewing the blast furnace 1, after removing all the stave 3 that has finished operation, the inner part of the seal plate 2S is cut and removed, and the remaining 2R is left fixed to the iron skin 2 at the bottom. The remaining portion 2R is used to seal the gap with the iron skin 2 by the stave 3L (see FIGS. 1 and 5). If the seal plate 2S has not disappeared despite the wear during operation, if it is difficult to cut and remove the inner portion of the seal plate 2S, or if there is another residual stave on the lower surface side of the lowermost stave 3L. If so, the frame body 24 may be extended so that the iron skin 2 and the elastic member 25 are directly pressed against each other.
In this state, the start end stave 3LF is installed at a predetermined position on the inner side surface 2F of the iron skin 2.

In FIG. 10, when the starting stave 3LF is installed, the intermediate stave 3LM is installed adjacent to the starting stave 3LF.
The intermediate stave 3LM is suspended on the side of the edge 201 of the starting stave 3LF and is held along the inner side surface 2F of the furnace. In this state, the end edge 201 (inclined in the first direction) of the seal member 20 of the start end stave 3LF and the end edge 202 (inclined in the first direction) of the seal member 20 of the intermediate stave 3LM face each other. If there is a gap between the end edge 201 of the start end stave 3LF and the end edge 202 of the intermediate stave 3LM, this gap is eliminated by moving the intermediate stave 3LM to the outside of the furnace where the iron skin 2 is located, and the start end stave 3LF The edge 201 and the edge 202 of the intermediate stave 3LM are pressed against each other.

In FIG. 11, when the intermediate stave 3LM is installed, the next intermediate stave 3LM is suspended and the same adjustment is performed to press-contact the end edge 201 and the end edge 202 of each seal member 20. By repeating such an operation, a plurality of intermediate stave 3LMs are sequentially installed clockwise.
In FIG. 12, when all the planned intermediate stave 3LMs have been installed, the terminal stave 3LE is installed between the intermediate stave 3LM installed immediately before and the starting stave 3LF installed first.

The end stave 3LE is suspended between the end edge 201 of the intermediate stave 3LM and the end edge 202 of the start end stave 3LF, and is held along the inner side surface 2F of the furnace. In this state, the end edge 202 (inclined in the first direction) of the seal member 20 of the terminal stave 3LE is arranged to face the end edge 201 (inclined in the first direction) of the seal member 20 of the intermediate stave 3LM. On the other hand, the end edge 201 (inclined in the second direction) of the seal member 20 of the end stave 3LE is arranged to face the end edge 202 (inclined in the second direction) of the seal member 20 of the start end stave 3LF.

If there is a gap between the edge 201 and 202 on each side, the gap between the edge 201 and 202 on each side is eliminated in parallel by moving the intermediate stave 3LM to the outside of the furnace where the iron skin 2 is located. be able to. That is, the inclination direction of the end edge 202 of the opposite end stave 3LE and the end edge 201 of the intermediate stave 3LM is the first direction, and the inclination direction of the end edge 201 of the end stave 3LE and the end edge 202 of the start end stave 3LF is the second direction. Since it is a direction and the respective inclination directions are opposite to each other, the terminal stave 3LE can be pushed between the intermediate stave 3LM and the starting stave 3LF in a wedge-like shape, and the installation can be performed. It can be easily done and pressure welding can be obtained at the end edges 201 and 202 on both sides.

As described above, by installing the lowermost stave 3L on the entire circumference of the inner side surface 2F of the iron skin 2, the gap between the stave 3L and the iron skin 2 is sealed by pressure welding between the seal member 20 and the remaining portion 2R. Then, the joints between the stave 3L are sealed with the sealing material 6.
After that, a normal stave 3 having a stave body 10 and a sealing material 6 is installed on the upper stage of the bottom stave 3L, and if the joints can be sealed with the sealing material 6, the iron skin 2 and the stave 3 are formed. The blast furnace 1 is renewed by filling and solidifying the castable 4 between the two.

[Effect of the first embodiment]
In the present embodiment, the stave main body 10 is fixed to the inner side surface 2F of the iron skin 2 at a predetermined interval and arranged in order. With the fixing of the stave main body 10, the seal member 20 is arranged so that the seal member 20 of the adjacent stave 3L and the end edges 201 and 202 of each other are adjacent to each other. Since the end edges 201 and 202 of the seal member 20 are inclined with respect to the thickness direction of the stave body 10 (diameter direction of the blast furnace 1), the stave body 10 is displaced in the thickness direction (diameter direction of the blast furnace 1). Then, the edge 201, 202 of the seal member 20 is displaced in the direction intersecting the thickness direction (diametrical direction of the blast furnace) (circumferential direction of the blast furnace 1), and the distance from the adjacent seal member 20 (edges 201, 202). Interval) can be increased or decreased.

In the stave 3L of the present embodiment, the end edges 201 and 202 on both sides of the seal member 20 are inclined to the same side. Therefore, by sequentially arranging the stave main bodies 10, the end edges 201 and 202 of the adjacent seal members 20 By making the iron skins 2 parallel to each other and moving them to the outside of the furnace where the iron skin 2 is located, the distance between the edge 201 and 202 can be uniformly reduced, and a reliable sealing can be performed over the entire length of the edge 201 and 202. can.
On the other hand, in the present embodiment, the end edge 202 of the seal member 20 of the start end stave 3LF and the end edge 201 of the seal member 20 of the end stave 3LE are set in the same first direction in the intermediate stave 3LM. By setting only the second direction opposite to the first direction, the terminal stave 3LE can be easily installed even when the stave 3L is installed all around, and pressure welding between all the end edges 201 and 202 can be obtained. be able to.

In the stave 3L of the present embodiment, since the elastic member 26 as the end edge side elastic member is attached to one end edge 201 of the seal member 20, the same as the end edge 202 of the seal member 20 of the other adjacent stave 3L. When the gap is increased or decreased, the elastic member 26 is sandwiched between the adjacent end edges 201 and 202 so that the gap between them can be reliably sealed.
Further, since the elastic member 25 on the outside of the furnace facing the iron skin 2 of the seal member 20 is mounted, the gap between the outer edge of the furnace and the iron skin 2 of the seal member 20 can be reliably sealed. When the above-mentioned stave body 10 is moved to the outside of the furnace where the iron skin 2 is located to shorten the gaps between the end edges 201 and 202, the elastic member 25 is provided on the outside of the furnace to seal the stave body 10 with the iron skin 2. Can always be maintained even in the middle of the process.

In the present embodiment, when the stave 3L is installed over the entire inner circumference of the iron skin 2, the intermediate stave 3LM, the start end stave 3LF and the end stave 3LE are used, and the end edges 201 and 202 of the seal member 20 of the intermediate stave 3LM are used. Inclination direction, the end edge 201 of the seal member 20 of the start stave 3LF and the end edge 202 of the seal member 20 of the end stave 3LE are set to the same first direction, and the end edge 202 of the seal member 20 of the start stave 3LF is set. And only the end edge 201 of the seal member 20 of the terminal stave 3LE was set to the second direction opposite to the first direction.
Therefore, the end edge 201 of the start end stave 3LF to the end edges 201 and 202 of the plurality of intermediate stave 3LM are in the same first direction, and the stave body 10 is moved to the outside of the furnace where the iron skin 2 is located. By doing so, the distance between the end edges 201 and 202 can be appropriately adjusted.

On the other hand, in the final end stave 3LE, the end edge 202 inclined in the first direction faces the end edge 201 of the intermediate stave 3LM, and the end inclined in the second direction with respect to the rounded start end stave 3LF. The edges 201 are in a state of facing each other. Since the first direction and the second direction are opposite to each other, the terminal stave 3LE is moved to the outside of the furnace where the iron skin 2 is located (displaced outward in the circumferential direction) to move the terminal stave 3LE to the intermediate stave 3LM. It can be pushed in a wedge shape between the start end stave 3LF and the end end stave 3LF, and the distance between the intermediate stave 3LM and the end edge 201 and the distance between the start end stave 3LF and the end edge 202 can be shortened.
When the first direction and the second direction are in the same direction (for example, the end edges 201 and 202 of the start end stave 3LF and the end stave 3LE are all the first direction), the stave body 10 is moved to the outside of the furnace where the iron skin 2 is located. As a result, for example, the distance between one (the distance between the intermediate stave 3LM and the end edge 201) is shortened, but the distance between the other (the distance between the start end stave 3LF and the end edge 202) is increased, and the end stave 3LE is increased. It becomes difficult to install it in an appropriate position.
On the other hand, in the present embodiment, by using the start end stave 3LF and the end stave 3LE in which the inclination directions are reversed on both sides, the stave 3L is arranged so as to go around the inside of the furnace, and the displacement in the radial direction is applied. The effect of the above-mentioned displacement of the present invention, such as sealing the gap between the sealing members 20, can be obtained.

[Second Embodiment]
13 to 16 show a second embodiment of the present invention.
In the first embodiment described above, the start stave 3LF, the intermediate stave 3LM, and the end stave 3LE are used as the stave 3L, and the start stave 3LF to the intermediate stave 3LM are sequentially connected, and between the last intermediate stave 3LM and the start stave 3LF. The terminal stave 3LE was installed. That is, in the first embodiment, the stave 3L is installed so as to circulate inside the blast furnace 1 in one direction. On the other hand, in the second embodiment, the stave 3L is installed so as to circulate inside the blast furnace 1 in two opposite directions.

In FIG. 13, in the second embodiment, the intermediate stave 3LM and 3LG are sequentially connected to both sides of the starting stave 3LF, respectively, and the ending stave 3LE is installed at a portion where each of them joins.
In the present embodiment, the configurations of the blast furnace 1 in which the stave 3L (3LF, 3LM, 3LG, 3LE) is installed and the stave 3L (3LF, 3LM, 3LE) itself are basically the same as those in the first embodiment described above. be. Therefore, in the following description, the same components as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.
The intermediate stave 3LG additionally used in the present embodiment has the same basic configuration as the intermediate stave 3LM, but the inclination directions (first direction, second direction) of the edge edges 201 and 202 are opposite to those of the intermediate stave 3LM. Moreover, the side on which the sealing material 6 is installed is reversed.

The installation procedure of the stave 3L (3LF, 3LM, 3LG, 3LE) of the present embodiment is as follows.
In FIG. 14, the starting stave 3LF is installed at a predetermined position inside the blast furnace 1, and the intermediate stave 3LM and the intermediate stave 3LG are connected to both sides thereof, respectively.
In FIG. 15, the intermediate stave 3LM is sequentially connected to one side of the blast furnace 1, and the intermediate stave 3LG is sequentially connected to the other side. As a result, about half the circumference of the inside of the blast furnace 1 is covered with the intermediate stave 3LM and 3LG.
In FIG. 16, the terminal stave 3LE is installed in the portion left between the last intermediate stave 3LM and the intermediate stave 3LG.
As a result, a stave 3L that covers the inside of the blast furnace 1 over the entire circumference is formed.

In such an embodiment, since approximately half of the circumference of the blast furnace 1 is covered with the intermediate stave 3LM and the intermediate stave 3LG, each installation work can be performed in parallel, and the construction period can be shortened.
In the present embodiment, the start stave 3LF and the end stave 3LE are on opposite sides of the center of the blast furnace 1, and the intermediate stave 3LM and 3LG are set to about half a circumference, but the position of the end stave 3LE with respect to the start stave 3LF. May be changed as appropriate, and one of the intermediate stave 3LM and 3LG may be installed longer than the other.
Further, in the present embodiment, one set of the start stave 3LF and the end stave 3LE is used, and both sides of each are connected by the intermediate stave 3LM and 3LG. As another embodiment, two or more sets of start stave 3LF and end stave 3LE may be arranged alternately, and both sides of each may be connected by intermediate stave 3LM, 3LG, and the work can be performed in parallel in four or more systems. Further shortening of construction period can be expected.

[Third Embodiment]
17 to 23 show a third embodiment of the present invention.
In the present embodiment, the configurations of the stave 3L (3LF, 3LM) and the blast furnace 1 in which these are installed are basically the same as those of the first embodiment described above. Therefore, in the following description, the same components as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

In the first and second embodiments described above, when all the stave 3 inside the blast furnace 1 is removed and a new stave 3 is installed, the starting stave 3LF, which is the stave 3L of the present invention, is intermediate. The stave 3LM, 3LG and the terminal stave 3LE were installed all around.
On the other hand, in the present embodiment, the wind is closed for a short period of time a plurality of times, only a part of the old stave 3 inside the blast furnace 1 (for example, half a lap) is removed, and the remaining half lap of the remaining section is an old stave. 3 is left as the residual stave 3U, and the stave 3L of the present invention is installed in the removed half-circle section.
At this time, the same intermediate stave 3LM and 3LG as in the first embodiment described above are used for the intermediate portion of the newly installed stave 3L. Further, in the present embodiment, the terminal stave 3LE as in the first embodiment or the second embodiment is not used, and the extension plate 27 suitable for connection with the residual stave 3U is used at both ends of the newly installed stave 3L. Extension stave 3LS, 3LT having is used.

In FIG. 17, the extension stave 3LS has a stave main body 10 and a seal member 20 similar to the stave 3L of the first embodiment described above.
However, in the extension stave 3LS of the present embodiment, the extension plate 27 is installed on the lower surface of the seal member 20 on the end edge 202 side.

In FIGS. 18 and 19, a support plate 241 is fixed to the frame body 24 of the seal member 20. The extension plate 27 is arranged along the lower surface of the support plate 241 and is fastened and fixed to the support plate 241 with bolts 271 inserted through a pair of elongated holes 272. The fixing method may be adhesive.
The extension plate 27 is normally in a state where it does not protrude from the edge 202 of the seal member 20. On the other hand, by loosening the bolt 271, the extension plate 27 can be pulled out to a state of protruding from the end edge 202.

The extension stave 3LT has the same basic configuration as the extension stave 3LS. However, the arrangement of the extension plate 27, the inclination direction of the end edges 201 and 202, and the side on which the sealing material 6 is installed are opposite to those of the extension stave 3LS.
That is, with respect to the end edges 201 and 202 and the sealing material 6, the extension stave 3LS arranges the intermediate stave 3LM, whereas the extension stave 3LT arranges the intermediate stave 3LG.
Further, regarding the extension plate 27, in the extension stave 3LS, the extension plate 27 was installed on the side of the end edge 202. On the other hand, in the extension stave 3LT, the extension plate 27 is installed on the lower surface of the seal member 20 on the end edge 201 side. When the extension plate 27 of the extension stave 3LT is pulled out, it may be in a state of sufficiently protruding from the elastic member 26 installed at the end edge 201.

The iron skin 2 is provided with work openings 2U at both ends of the residual section at positions where the ends of the residual stave 3U can be seen. A collar 2V having a flange is welded to the working opening 2U so that it can be sealed again.
When sealing the work opening 2U, as shown in FIGS. 22 and 23, the work opening 2U is covered with a plate-shaped lid 2W and fastened to the collar 2V with bolts and nuts. A structure to be welded to can be used. The lid 2W may be directly welded to the iron skin 2 around the working opening 2U without using the collar 2V. Of these, according to the structure in which the lid 2W is welded and fixed, a reliable seal can be expected. However, when removing the welded lid 2W again, cutting work such as a welding scrap is required. On the other hand, the bolt-nut method has good workability in both sealing and removal.

The procedure for installing the extended stave 3LS, 3LT and the intermediate stave 3LM in the present embodiment is as follows.
In FIG. 20, regarding the old stave 3 installed inside the iron skin 2 of the blast furnace 1, the section for half the circumference (the right half in the figure indicated by the alternate long and short dash line) was removed, and the remaining section (FIG. 20). The one on the left side of the middle) is left as the residual stave 3U.
In FIG. 21, the starting stave 3LF is attached at a position in the middle of the section where the old stave 3 has been removed, that is, at one place excluding the end of the section.
In FIG. 22, intermediate stave 3LM and 3LG are sequentially connected to both sides of the starting stave 3LF, respectively.

For the intermediate stave 3LG connected counterclockwise from the start end stave 3LF, an extension stave 3LS having an extension plate 27 at the end edge 202 is installed between the intermediate stave 3L and the end portion (upper side in the drawing) of the residual stave 3U. When installing the extension stave 3LS, the extension plate 27 is pulled out by bringing the end edge 202 of the extension stave 3LS close to the end of the residual stave 3U and operating from the work opening 2U, and the end of the residual stave 3U. Connect to.
For the intermediate stave 3LM connected clockwise from the start end stave 3LF, an extension stave 3LT having an extension plate 27 at the end edge 201 is installed between the intermediate stave 3U and the end portion (lower side in the figure) of the residual stave 3U. When installing the extension stave 3LT, the extension plate 27 is pulled out by bringing the end edge 201 of the extension stave 3LT close to the end of the residual stave 3U and operating from the work opening 2U, and the end of the residual stave 3U. Connect to.

As shown in FIG. 23, in the extension stave 3LS, 3LT, between the extension plate 27 and the end of the residual stave 3U (circumferential direction of the blast furnace 1), or between the extension plate 27 and the remaining portion 2R and the elastic member 25. (The radial direction of the blast furnace 1, that is, the direction outside the furnace inside the furnace) may have gaps. If these gaps are large, the castable 4 may leak when the castable 4 is filled. Therefore, the amorphous refractory material lumps 4S and 4T are arranged on the drawn extension plate 27 and compacted to close the gap.
The work of arranging the lumps 4S and 4T is performed through the work opening 2U, and when the work is completed, the work opening 2U is sealed with the lid 2W.

As described above, the stave 3L (3LF, 3LG, 3LM, 3LS, 3LT) having the seal member 20 is installed in the section where the old stave 3 is removed.
In these stave 3L (3LF, 3LG, 3LM, 3LS, 3LT), each elastic member 25 is pressed against the remaining portion 2R to seal the space between the stave 3L and the iron skin 2, and the elastic member between the stave 3L is sealed. 26 is sandwiched and sealed. Further, the extension stave 3LS and 3LT arranged at both ends are sealed between the extension stave 3U and the residual stave 3U by the extension plate 27 and the lumps 4S and 4T of the amorphous refractory material, respectively.
As a result, the newly installed half-lap stave 3L (3LF, 3LG, 3LM, 3LS, 3LT) and the half-lap remaining stave 3U left unremoved make the bottom stave over the entire circumference. 3 is formed, and after a new stave 3 is loaded on the upper stage of the stave 3L for half a circumference, the blast furnace 1 can be partially renewed by filling the castable 4.

After the restart of the blast furnace 1, when a predetermined period elapses and the remaining part of the inside of the blast furnace 1 (remaining stave 3U for half a circumference) is renewed, the following work is performed.
After the wind is stopped, the residual stave 3U is removed, the previously sealed work opening 2U is reopened, and the extension plates 27 of the extension stave 3LS and 3LT are returned so that they do not protrude from the end edges 201 and 202. back. In this state, the extension stave 3LS, 3LT can be handled in the same manner as the intermediate stave 3LG, 3LM, because both sides of the seal member 20 are connected to the other by the edge edges 201, 202.

Next, the intermediate stave 3LG is installed adjacent to the end edge 202 of one extension stave 3LS, and the intermediate stave 3LM is installed adjacent to the end edge 201 of the extension stave 3LT on the opposite side. Further, the intermediate stave 3LG and 3LM are connected in sequence. Then, when a predetermined number of intermediate stave 3LGs and 3LMs are installed, the same terminal stave 3LE as in the second embodiment described above is installed between the end edge 201 of the intermediate stave 3LM and the end edge 202 of the intermediate stave 3LG. ..

As described above, inside the blast furnace 1, following the half-circle stave 3L installed in the previous update, the remaining half-circle stave 3L is installed, and as a result, the lowest stage stave over the entire circumference of the blast furnace 1. The update of 3L can be completed.
According to the present embodiment, the same effect as that of the first embodiment described above can be obtained, and the stave 3L around the entire circumference can be renewed in a plurality of times, and the wind break period can be shortened. ..
In the present embodiment, since the extension stave 3LS and 3LT having the extension plate 27 are used for the connection between the non-renewable residual stave 3U and the stave 3L of the present invention, the gap between them can be reliably sealed and the structure can be sealed. Can be simplified. Since the extension plate 27 is operated through the work opening 2U formed in the iron skin 2, the work in the furnace can be reduced.

[Modification example]
The present invention is not limited to the above-described embodiment, and modifications within the range in which the object of the present invention can be achieved are included in the present invention.
In the above-described embodiment, in the intermediate stave 3LM and 3LG, the end edges 201 and 202 of the seal member 20 are both inclined clockwise (intermediate stave 3LM) or counterclockwise (intermediate stave 3LG) toward the outside of the furnace. , This inclination angle (first angle, inclination angle with respect to the thickness direction of the stave body 10) may be appropriately selected in the implementation.
In the above embodiment, the sealing member 20 of the starting stave 3LF has a substantially trapezoidal shape in which the outer edge of the furnace is longer than the inner edge of the furnace, and the sealing member 20 of the terminal stave 3LE has a substantially trapezoidal shape in which the outer edge of the furnace is shorter than the inner edge of the furnace. One and the other of the respective edge edges 201 and 202 were set as the first angle and the second angle, but the second angle may be the same angle as the first angle in the direction opposite to the thickness direction of the stave body 10. It may be at a different angle. However, when the terminal stave 3LE is moved in the radial direction of the blast furnace 1 (displaced in the thickness direction of the terminal stave 3LE) by adjusting the position of the terminal stave 3LE, the changes in the gaps at the end edges 201 and 202 on both sides are the same. Therefore, it is preferable that the first angle and the second angle are opposite to each other but have the same angle.

In the above embodiment, the elastic member 26 (end edge side elastic member) is attached to the end edges 201 and 202 of the seal member 20, and the elastic member 25 (furner outer elasticity) is attached to the outer edge of the furnace facing the iron skin 2 of the seal member 20. Member) was attached. However, the elastic members 25 and 26 may be integrated, that is, continuous from one of the end edges 201 and 202 of the seal member 20 to the outer edge of the furnace facing the iron skin 2.
The elastic members 25 and 26 are not limited to synthetic rubber foams such as butyl rubber sponges, but also foams of other synthetic resins, solid plates or hollow tubular materials made of elastic materials such as natural rubber and silicon rubber. , Or may be made of ceramic wool or the like, which is expected to have heat resistance.
In the above embodiment, the elastic members 25 and 26 are fixed to the frame body 24 with bolts 251,261, but other locking tools or the like may be used, and if the strength can be secured, an adhesive or an adhesive tape may be used. good.
In the above embodiment, the remaining portion 2R of the seal plate 2S left on the iron skin 2 was diverted for sealing with the iron skin 2, but these were completely removed and the elastic member 25 was used as the furnace of the iron skin 2. It may be directly pressed against the inner side surface 2F.

The seal member 20 is not limited to the one formed by welding the frame body 24 to the base plate 21 to form a box shape in which the lower surface is open, but may be a box shape in which the lower surface is closed, or H-shaped steel or C. Shaped steel may be used. Further, the seal member 20 is not limited to the one in which the elastic members 25 and 26 are attached to the basic portion made of a steel material, and the entire seal member 20 may be formed of the elastic member.
On the other hand, as the seal member 20, it is not essential to attach the elastic members 25 and 26 to the basic portion composed of the base plate 21 and the frame body 24, for example, a member that advances and retreats toward the adjacent seal member 20 or the iron skin 2. The elastic members 25 and 26 may be omitted as long as the gap can be eliminated by using.

In the third embodiment described above, extension stave 3LS and 3LT having an extension plate 27 are used in order to partially renew the blast furnace 1, but these may be omitted. In that case, when connecting to the residual stave 3U, lumps 4S and 4T of amorphous refractory material are arranged from the work opening 2U so that the gap between the residual stave 3U and the stave 3L of the present invention is surely sealed. It needs to be constructed. In order to surely perform such construction, it is preferable to use extension stave 3LS, 3LT having an extension plate 27.
As the stave body 10 in the above embodiment, any stave such as copper, cast iron, or surface shape can be used. Further, the blast furnace 1 to which the present invention is applied can also be applied to any type.

The present invention relates to a stave and a method of installing the stave.

1 ... Blast furnace, 10 ... Stave body, 11 ... Fixing bolt, 12 ... Furnace outer surface, 13 ... Water supply port, 14 ... Drain port, 15 ... Bottom surface, 16 ... Side surface, 2 ... Iron skin, 20 ... Seal member, 201, 202 ... Edge, 21 ... Base plate, 22 ... Bolt, 23 ... Standing part, 24 ... Frame body, 241 ... Support plate, 25, 26 ... Elastic member, 27 ... Extension plate, 251,261,271 ... Bolt, 272 ... Long hole, 2F ... Furnace inner side, 2H ... Opening, 2P ... Rod, 2R ... Remaining part, 2S ... Seal plate, 2U ... Working opening, 2V ... Color, 3 ... Stave, 3L, 3L1, 3L2 ... In the present invention Based on the bottom stave, 3LE ... terminal stave, 3LF ... start stave, 3LM ... intermediate stave, 3LS, 3LT ... extension stave, 3U ... residual stave, 4 ... castable, 4S, 4T ... irregular refractory mass, 6 ... Sealing material, 6E ... elastic body, 6S ... iron plate, G ... gap.

Claims (6)

It has a plate-shaped stave body that is arranged along the inner side surface of the iron skin and the side surfaces face each other, and a seal member that is fixed to the lower surface side of the stave body and seals the space between the iron skin and the iron skin. death,
The seal member is characterized in that the end edge protrudes from the side surface of the stave main body and is inclined with respect to the thickness direction of the stave main body. In the stave according to claim 1,
The seal member is a stave characterized in that the end edges on both sides are inclined to the same side. In the stave according to claim 1 or 2.
A stave characterized in that an end edge side elastic member is attached to the end edge of the seal member, and a furnace outside elastic member is attached to the furnace outer edge facing the iron skin of the seal member. In the stave according to any one of claims 1 to 3.
The seal member is a stave that is movably supported along the seal member and has an extension plate that can project from the edge. It has a plate-shaped stave body that is arranged along the inner side surface of the iron skin and the side surfaces face each other, and a seal member that is fixed to the lower surface side of the stave body and seals the space between the iron skin and the iron skin. However, the seal member uses an intermediate stave, a start end stave, and an end stave whose end edges protrude from the side surface of the stave body and are inclined with respect to the thickness direction of the stave body.
In the intermediate stave, both the edge edges on both sides of the sealing member are inclined in the first direction or the second direction opposite to the first direction.
In the start end stave, one end edge of the seal member is set to the first direction and the other end edge is inclined to the second direction.
In the end stave, one and the other end edges of the seal member are tilted in the opposite direction to the start stave.
The starting stave is installed inside the iron skin,
The intermediate stave is installed next to the start stave,
Repeatedly installing another intermediate stave next to the intermediate stave,
A method for installing a stave, which comprises installing the end stave between the intermediate stave and the start stave. It has a plate-shaped stave body that is arranged along the inner side surface of the iron skin and the side surfaces face each other, and a seal member that is fixed to the lower surface side of the stave body and seals the space between the iron skin and the iron skin. However, the seal member uses an intermediate stave, a start end stave, and an extension stave whose end edges protrude from the side surface of the stave body and are inclined with respect to the thickness direction of the stave body.
An extension plate that is movably supported along the seal member and can protrude from the end edge is installed in the extension stave.
The existing stave installed inside the iron skin is removed, leaving the residual stave in the predetermined residual section.
In the range where the existing stave is removed, the start stave is installed other than next to the residual stave, and the intermediate stave is installed next to the start stave.
Repeatedly installing another intermediate stave next to the intermediate stave,
Installation of a stave, characterized in that the extension stave is installed between the intermediate stave and the residual stave at the end of the residual section, and the extension plate of the extension stave is projected toward the residual stave. Method.

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