JP2021116545A - Coping replacement construction method - Google Patents

Abstract

To provide a coping replacement construction method capable of holding design properties around a parapet while suppressing cost when replacing an existing coping with a new coping.SOLUTION: A coping replacement construction method for replacing an existing coping 3 installed on an upper part of a rising part 2 of a parapet 1 with a new coping 4, comprises: a removal step of removing the existing coping 3 having a first outer peripheral covering part 33 covering an upper end part of an outer peripheral surface 2b of the rising part 2 from the rising part 2; an installation step of installing the new coping 4 having a second outer periphery covering part 43 covering an upper end part of the outer peripheral surface 2b of the rising part 2 on an upper part of the rising part 2; and a covering step of covering a range X from a lower end 43e of the second outer peripheral covering part 43 to a height H at which a lower end of the first outer peripheral covering part 33 is positioned in the outer peripheral surface 2b of the rising part 2 with a decorative modesty panel material 5 when the lower end 43e of the second outer peripheral covering part 43 installed in the rising part 2 is arranged at a position higher than a lower end position of the first outer peripheral covering part 33 before removal.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for replacing an existing cap tree installed at a rising portion of a parapet with a new cap tree.

Usually, the flat roof of a building is equipped with a parapet that extends upward along the outer circumference. The parapet consists of a rising portion that rises upward from the flat roof surface and a cap tree that is fixed to the upper part of the rising portion, and is a component of the exterior of the building, so it is desirable to maintain the aesthetic appearance. Therefore, it has been proposed to install a decorative material on the outer peripheral surface of the rising portion to improve the design of the parapet (for example, Patent Document 1).

Jikkai Sho 57-13762

By the way, the Kasagi installed in the rising part is replaced with a new Kasagi when it deteriorates over time. At this time, if the model number of the existing cap tree is discontinued, it may not be possible to install a new cap tree having the same shape as the existing cap tree. If the shapes of the old and new caps are different in this way, the removal traces of the existing caps may be exposed on the outer peripheral surface of the rising portion, which may spoil the appearance of the building. Further, if a new cap tree is molded each time according to the shape of the removal trace so that the removal trace of the existing cap tree is not exposed, there arises a problem that the cost increases and the financial burden on the owner increases.

Therefore, the present invention has been made in view of the above-mentioned problems, and when replacing an existing cap tree with a new cap tree, it is possible to maintain the design around the parapet while suppressing the cost. The purpose is to provide a method.

The first method of replacing the cap tree of the present invention is a method of replacing the existing cap tree installed on the upper part of the rising portion of the parapet with a new cap tree, and is the upper end portion of the outer peripheral surface of the rising portion. The new cap tree having a removal step of removing the existing cap tree having the first outer peripheral covering portion covering the rising portion from the rising portion and a second outer peripheral covering portion covering the upper end portion of the outer peripheral surface of the rising portion. The installation step of installing the above-mentioned rising portion and the lower end of the second outer peripheral covering portion installed on the rising portion are arranged at a position higher than the lower end position of the first outer peripheral covering portion before removal. In this case, the coating step of covering the range from the lower end of the second outer peripheral covering portion to the height at which the lower end of the first outer peripheral covering portion was located in the outer peripheral surface of the rising portion with the decorative curtain plate material. It is characterized by having.

In the second method of replacing the cap tree of the present invention, the second outer peripheral covering portion covers the upper end portion of the outer peripheral surface of the rising portion and the lower end portion of the upper curtain plate portion. A barb piece projecting in the direction of the rising portion and a lower curtain plate portion extending downward from the edge of the barb piece on the rising portion side are provided, and the covering step is performed on the upper end portion of the decorative curtain plate material. Is in contact with the inside corner portion formed by the return piece and the lower curtain plate portion.

The third method of replacing the cap tree of the present invention is characterized in that the covering step is to install the decorative curtain plate material having an L-shaped cross section.

In the fourth method of replacing the cap tree of the present invention, the installation process installs a plurality of the newly installed cap trees in the horizontal direction, and the covering process installs a plurality of the decorative curtain plate materials in the horizontal direction in the horizontal direction. The newly installed caps that are adjacent to each other are connected by a caps tree joint cover that straddles each horizontal edge, and the decorative curtain plate materials that are adjacent to each other in the horizontal direction are connected to each other by a curtain plate joint cover that straddles each horizontal edge. Further, the connecting step is characterized in that the joint positions of the Kasagi joint cover and the curtain plate joint cover are aligned with each other.

In the fifth method of replacing the cap tree of the present invention, in the connecting step, the cap tree joint cover is fixed to only one of the adjacent new cap trees with screws, and the curtain plate joint cover is attached. It is characterized in that only one of the adjacent decorative curtain plate materials is fixed with screws.

According to the first method of replacing the cap tree of the present invention, when the lower end of the second outer peripheral covering portion installed at the rising portion is arranged at a position higher than the lower end position of the first outer peripheral covering portion before removal. In addition, it is said that the range from the lower end of the second outer peripheral covering portion to the height at which the lower end of the first outer peripheral covering portion is located on the outer peripheral surface of the rising portion is covered with the decorative curtain plate material. Therefore, even if the shapes of the existing caps and the new caps are different, the portion of the rising portion covered with the existing caps is not exposed, and the design of the exterior of the building can be maintained.

According to the second method of replacing the cap tree of the present invention, it is said that in the covering step, the upper end portion of the decorative curtain plate material is brought into contact with the inside corner portion formed by the return piece and the lower curtain plate portion. .. Therefore, it is possible to effectively suppress the possibility that water invades the inside of the rising portion from the boundary between the newly installed cap tree and the decorative curtain plate material, and it is possible to improve the waterproof property.

According to the third method of replacing the cap tree of the present invention, the covering step is to install a decorative curtain plate material having an L-shaped cross section, which is a simple shape. Therefore, as compared with the case where the new cap tree is molded each time according to the shape of the existing cap tree, the cost can be suppressed and the design around the parapet can be maintained.

According to the fourth Kasagi replacement construction method of the present invention, in the connecting process, the joint positions of the Kasagi joint cover that connects the newly installed Kasagi and the curtain plate joint cover that connects the decorative curtain plate materials are aligned. It is said to be something to do. Therefore, it is possible to give a sense of unity to the exterior of the building and improve the design.

According to the fifth Kasagi replacement construction method of the present invention, in the connecting process, the Kasagi joint cover is fixed to only one of the adjacent new Kasagi with screws, and the curtain plate joint cover is attached to the adjacent cosmetics. It is said that only one of the curtain plate materials is fixed with screws. Therefore, even if the newly installed Kasagi or the decorative curtain board material expands or contracts due to external factors such as temperature and humidity, it is possible to prevent each member from being damaged.

(A) Schematic plan view showing the building, (b) Cross-sectional view taken along the line AA of FIG. 1 (a). (A) A cross-sectional view showing a situation in which a new cap tree is installed in a rising portion, and (b) a plan view showing a parapet in which a new cap tree is installed. FIG. 2B is a cross-sectional view taken along the line BB in FIG. 2 (b). A front view showing a state in which a new Kasagi is installed at the rising part. A cross-sectional view showing a state in which the decorative curtain board material is fixed to the newly installed Kasagi. The perspective view which shows the decorative curtain board material. FIG. 5 is an enlarged view of part C in FIG. (A) A plan view showing a situation in which newly installed Kasagi are connected by a Kasagi joint cover, and (b) a perspective view showing a Kasagi joint cover. (A) A perspective view showing a corner Kasagi joint cover, and (b) a perspective view showing a corner Kasagi joint cover. (A) A front view showing a state in which the newly installed Kasagi are connected to each other with a Kasagi joint cover, and (b) a cross-sectional view showing a state in which the Kasagi joint cover is installed in the newly installed Kasagi. (A) A front view showing a situation in which decorative curtain plate materials are connected by a curtain plate joint cover, (b) a perspective view showing a curtain plate joint cover, (c) a perspective view showing a corner joint cover, and (d) a corner portion. The perspective view which shows the joint cover. A cross-sectional view showing a state in which a curtain plate joint cover is installed on a decorative curtain plate material.

Hereinafter, the best embodiment of the Kasagi replacement construction method according to the present invention will be described with reference to each figure. The replacement construction method of the cap tree of the present application is a construction method used when replacing the existing cap tree installed on the upper part of the rising portion of the parapet with a new cap tree having a shape different from the existing cap tree, and in particular, the outer circumference of the parapet. It is used when the part of the surface that was covered with the existing cap tree cannot be covered with the new cap tree alone.

As shown in FIG. 1A, the parapet 1 is a portion installed along the outer peripheral portion of the flat roof R of the building S, and is formed on a rooftop roof or the like in addition to the illustrated balcony. As shown in FIG. 1B, the parapet 1 before the replacement construction method of the cap tree has a rising portion 2 rising above the flat roof surface Ra and an existing cap tree 3 fixed to the upper part of the rising portion 2. And consists of. Further, the parapet 1 is a portion that can be visually recognized when looking up at the building S, and is a component of the exterior of the building, so that it is desired to maintain the aesthetic appearance.

As shown in FIG. 1B, the rising portion 2 is a pair of exterior materials 21 forming an inner peripheral surface 2a which is a side surface on the flat roof R side and an outer peripheral surface 2b which is a side surface opposite to the inner peripheral surface 2a. And the exterior base material 22 that supports the pair of exterior materials 21, the cap tree support material 23 that is installed at the upper end of the exterior base material 22 and supports the existing cap tree 3, and the pair of exterior materials 21 and the cap tree support material 23. It is composed of a base covering material 24 having a U-shaped cross section that covers the upper end. A handrail 25 is installed on the inner peripheral surface 2a.

The existing cap tree 3 shown in FIG. 1 (b) is a member extending in the horizontal direction having a substantially U-shaped cross section. The existing cap tree 3 includes a first upper covering portion 31 that covers the upper portion of the rising portion 2, a first inner peripheral covering portion 32 that hangs down from the edge of the first upper covering portion 31 on the inner peripheral surface 2a side, and a first portion. 1 It has a first outer peripheral covering portion 33 that hangs down from an end surface of the upper covering portion 31 on the outer peripheral surface 2b side. The existing cap tree 3 is made of ceramic, and the first upper covering portion 31 is pressure-bonded to the upper surface of the existing cap tree base material 24 with a mortar material (not shown). The first inner peripheral covering portion 32 covers the upper end portion of the inner peripheral surface 2b of the rising portion 2, while the first outer peripheral covering portion 33 covers the upper end portion of the outer peripheral surface 2b of the rising portion 2.

As shown in FIG. 2A, the method of replacing the existing cap tree 3 with the new cap tree 4 is to first remove the existing cap tree 3 and the mortar material from the rising portion 2 and then install the rising portion 2. The portion covered with Kasagi 3 is exposed. At this time, the inner peripheral surface 2a and the outer peripheral surface 2b are faded or aged due to the portion covered by the first inner peripheral covering portion 32 and the first outer peripheral covering portion 33 of the existing cap tree 3 and the portion not covered. The degree of deterioration is different. In particular, since the outer peripheral surface 2b of the rising portion 2 is an element constituting the exterior of the building, the difference is noticeable when looking up at the building S.

Next, the Kasagi base material 26, which is the base of the newly installed Kasagi 4, is installed on the upper part of the base covering material 24. The cap tree base material 26 shown in FIG. 2A has a fixing portion 26a fixed to the cap tree support material 23 via a base covering material 24 with screws, and an end edge and an outer peripheral surface 2b of the fixing portion 26a on the inner peripheral surface 2a side. It has a pair of extension portions 26b that extend downward from the side edge.

As shown in FIG. 3, the lumber base material 26 is fixed to the lumber support member 23 with screws, and then the newly installed lumber 4 is installed on the rising portion 2 of the parapet 1. The new cap tree 4 installed in the parapet 1 in place of the existing cap tree 3 is formed by extruding and molding aluminum. Like the existing Kasagi 3, the new Kasagi 4 is a member that extends in the horizontal direction in a substantially U-shaped cross section, and has a second upper covering portion 41 that covers the upper portion of the rising portion 2 and a second upper covering portion. The second inner peripheral covering portion 42 hanging from the edge of the inner peripheral surface 2a side of the 41 and the second outer peripheral covering portion 43 hanging from the end edge of the second upper covering portion 41 on the outer peripheral surface 2b side. Have. Further, the second inner peripheral covering portion 42 is formed by bending the curtain plate portion 42a that covers the upper end portion of the inner peripheral surface 2a of the rising portion 2 and the lower end portion of the curtain plate portion 42a toward the rising portion 2 side. Is equipped with. On the other hand, the second outer peripheral covering portion 43 includes an upper curtain plate portion 43a that covers the upper end portion of the outer peripheral surface 2b of the rising portion 2 and a second return piece that projects from the lower end portion of the upper curtain plate portion 43a toward the rising portion 2. 43b, a lower curtain plate portion 43c extending downward from the edge of the second return piece 43b on the rising portion 2 side, and a third return piece 43d in which the lower end of the lower curtain plate portion 43c is bent toward the rising portion 2 side. It is equipped. Further, the lower end of the upper curtain plate portion 43a extends downward from the second return piece 43b, so that the water flowing on the surface of the upper curtain plate portion 43a does not propagate to the second return piece 43b side. It can flow down.

As shown in FIG. 2B, a plurality of newly installed cap trees 4 are installed in the horizontal direction according to the length of the rising portion 2, and when installed at the corners or inside corners, the edge is 45 °. It is cut into so-called retaining and retaining. As shown in FIG. 3, when the newly installed Kasagi 4 is installed in the rising portion 2, the first return piece 42b of the second inner peripheral covering portion 42 and the third return piece 43d of the second outer peripheral covering portion 43 are placed on the Kasagi base. It is installed by hooking it on the lower ends of the pair of extending portions 26b of the material 26. At this time, the adjacent new cap trees 4 are installed with a gap Y1 of about 5 mm as shown in FIG.

As shown in FIG. 3, when the newly installed cap tree 4 is installed above the rising portion 2, the second inner peripheral covering portion 42 covers the upper end portion of the inner peripheral surface 2a of the rising portion 2, and the second outer peripheral covering portion 43 Covers the upper end of the outer peripheral surface 2b of the rising portion 2. At this time, the lower end 43e of the third return piece 43d is arranged at a position higher than the height H where the lower end 33a of the first outer peripheral covering portion 33 shown in FIG. 1 was located, as shown in FIG. Of the outer peripheral surface 2b of the rising portion 2, a part (range X) of the portion covered by the first outer peripheral covering portion 33 is exposed.

Next, as shown in FIG. 5, the decorative curtain plate material 5 is installed below the newly installed Kasagi 4. The decorative curtain plate material 5 shown in FIGS. 5 and 6 is a member extending in the horizontal direction, and is formed by bending an aluminum plate material into an L-shape in a cross-sectional view. Further, the decorative curtain plate material 5 is composed of a curtain plate portion 51 that covers the range X of the outer peripheral surface 2b described above, and a return portion 52 that extends from the lower end of the curtain plate portion 51 to the rising portion 2 side. The curtain plate portion 51 has first screw holes 51a formed at both ends in the horizontal direction, and the distance L1 in the height direction is the length from the lower end of the second return piece 43b of the newly installed Kasagi 4 to the height H. It is almost the same as the distance. As shown in FIG. 7, in the decorative curtain plate material 5, the upper end portion of the curtain plate portion 51 is brought into contact with the inside corner portion 43f formed by the second return piece 43b and the lower curtain plate portion 43c of the newly installed Kasagi 4. , It is attached by a double-sided tape previously attached to the surface of the lower curtain plate portion 43c on the decorative curtain plate material 5 side. Then, the screw 6 penetrates one of the curtain plate portion 51, the lower curtain plate portion 43c, and the cap tree base material 26, and is fixed to the newly installed cap tree 4. At this time, since the distance L1 in the height direction of the curtain plate portion 51 described above is substantially the same as the length from the lower end of the second return piece 43b to the height H of the newly installed Kasagi 4, the range X shown in FIG. Is in a state of being covered with the decorative curtain plate material 5. Further, as shown in FIG. 10, a plurality of decorative curtain plate materials 5 are installed in the horizontal direction as in the case of the new Kasagi 4, and the joint positions thereof are aligned with the joint positions of the new Kasagi 4. By aligning the joint positions of the decorative curtain plate material 5 and the newly installed Kasagi 4 in this way, it is possible to give a sense of unity to the appearance of the building S and improve the design of the building appearance. The adjacent decorative curtain plate materials 5 are installed in the new Kasagi 4 with a gap of about 5 mm, as in the case of the new Kasagi 4.

Subsequently, as shown in FIG. 8A, the newly installed Kasagi 4s adjacent to each other in the horizontal direction are connected to each other by the Kasagi joint cover 7. As shown in FIG. 8B, the Kasagi joint cover 7 is a member obtained by bending an aluminum plate material into a substantially U-shaped cross section, and has an elongated upper connecting portion 71 and the length of the upper connecting portion 71. It is composed of a pair of side surface connecting portions 72 whose both end edges in the longitudinal direction are bent downward, and a pair of hooking pieces 73 in which the lower ends of the pair of side surface connecting portions 72 are cut in directions close to each other. Further, among the pair of side surface connecting portions 72, the height distance L2 from the upper end of one side surface connecting portion 72 to the upper surface of one hook piece 73 is substantially the same as the curtain plate portion 42a of the newly installed Kasagi 4 shown in FIG. The height distance L3 from the upper end of the other side surface connecting portion 72 to the upper surface of the other hooking piece 73 is substantially the same as the height of the upper curtain plate portion 43a of the newly installed Kasagi 4 shown in FIG. It has become. Then, in one of the hooking pieces 73 of the pair of hooking pieces 73, a second screw hole 73a penetrating in the plate thickness direction is formed at one end in the width direction. When connecting the newly installed caps 4 arranged at the corners and the corners, as shown in FIGS. 9 (a) and 9 (b), the corners or the corners or the edges of the upper connecting portion 71 in the length direction are connected. The corner Kasagi joint cover 74 and the corner Kasagi joint cover 75 having the corners formed are used.

When connecting the adjacent new Kasagi 4s with the Kasagi joint cover 7, first, as shown in FIG. 10A, the Kasagi joint cover straddles the horizontal edge 4a of each of the adjacent new Kasagi 4. Place 7. Then, as shown in FIG. 10B, one hook piece 73 is hooked on the first return piece 42b, and the other hook piece 73 is hooked on the lower end of the upper curtain plate portion 43a, so that the upper connecting portion The 71 is brought into contact with the second upper covering portion 41 of the adjacent new Kasagi 4. Finally, a screw 6 is driven from the second screw hole 73a to fix one hook piece 73 to the first return piece 42b of the new Kasagi 4. In this way, by fixing the Kasagi joint cover 7 to only one of the new Kasagi 4, the new Kasagi 4 expands and contracts due to external factors such as temperature and humidity and interferes with the adjacent new Kasagi 4, or the Kasagi joint. It is possible to prevent the cover 7 from being damaged.

Next, as shown in FIG. 11A, the decorative curtain plates 5 adjacent to each other in the horizontal direction are connected to each other by the curtain plate joint cover 8. The curtain plate joint cover 8 shown in FIG. 11B is a member obtained by bending an aluminum plate material into an L-shape in a cross-sectional view, and has a strip-shaped fixing portion 81 fixed to the decorative curtain plate material 5 and a fixing portion 81. It is composed of a horizontal portion 82 protruding in the horizontal direction from one end in the length direction of the aluminum. Double-sided tape 81a is attached to the surface of the fixed portion 81 on the horizontal portion 82 side, and a third screw hole 81b is formed at one end in the width direction. When connecting the decorative curtain plate materials 5 arranged at the corners and the corners, the fixing portion 81 is bent 90 ° at the substantially center in the width direction as shown in FIGS. 11 (c) and 11 (d). The corner curtain plate joint cover 83 and the corner curtain plate joint cover 84 are used.

When connecting the adjacent decorative curtain plate materials 5 with the curtain plate joint cover 8, as shown in FIG. 11A, the curtain plate so as to straddle the horizontal edge 5a of each of the adjacent decorative curtain plate materials 5. The joint cover 8 is arranged, and the double-sided tape 81a of the fixing portion 81 described above is attached to the adjacent decorative curtain plate material 5. Then, as shown in FIG. 12, a screw 6 is driven from the third screw hole 81b, and the fixing portion 81 is fixed to the curtain plate portion 51 of one of the decorative curtain plate materials 5. By fixing the curtain plate joint cover 8 to only one of the decorative curtain plate materials 5 with screws in this way, the decorative curtain plate material 5 expands and contracts due to external factors such as temperature and humidity and is adjacent to the curtain plate joint cover 7 as in the case of the Kasagi joint cover 7. It is possible to prevent the curtain plate joint cover 8 from being damaged or interfering with the matching decorative curtain plate material 5.

As described above, in the method of replacing the cap tree of the present application, when the lower end position of the new cap tree 4 is higher than the lower end position of the existing cap tree 3, the range X of the rising portion 2 is covered with the decorative curtain plate material 5. be. Therefore, even if the shape of the existing cap tree 3 and the shape of the new cap tree 4 are different, the portion of the rising portion 2 covered with the existing cap tree 3 is not exposed, and the design of the exterior of the building is maintained. be able to. In addition, when the finish of the portion covered with the existing cap tree 3 on the outer peripheral surface 2b is repaired according to the finish of the portion not covered, or when a decorative body difference is installed under the existing cap tree 3. It is not necessary to reattach the decorative body difference to match the lower end of the newly installed Kasagi 4, and the workability can be improved.

Further, the height distance L4 of the range X shown in FIG. 4 varies depending on the shape of the existing cap tree 3, but the range X is surely covered by adjusting the height of the curtain plate portion 51 of the decorative curtain plate material 5. be able to. That is, it is not necessary to mold the new cap tree 4 having a complicated shape to match the shape of the existing cap tree 3 each time, and the range A can be covered only by adjusting the decorative curtain plate material 5 which is a simple shape. It is possible to maintain the design around the parapet.

The embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the idea of the present invention.

The method for replacing the cap tree according to the present invention can be suitably used when the lower end position of the new cap tree is higher than the lower end position of the existing cap tree.

1 Parapet 2 Rising part 2b (Rising part) outer peripheral side surface 3 Existing Kasagi 33 1st outer peripheral covering part 33a Lower end of 1st outer peripheral covering part 4 New Kasagi 43 2nd outer peripheral covering part 43a Upper curtain plate part 43b 2nd return piece ( Return piece)
43c Lower curtain plate 43e Lower end of the third return piece (lower end of the second outer peripheral covering)
43f Inside corner 5 Decorative curtain plate material 7 Kasagi joint cover 8 Curtain plate joint cover H Height where the lower end of the existing Kasagi was located X The lower end of the second outer peripheral covering part to the lower end of the first outer peripheral covering part were located Range up to height

Claims (5)

It is a replacement construction method of the cap tree that replaces the existing cap tree installed on the upper part of the rising part of the parapet with a new cap tree.
A removal step of removing the existing cap tree having the first outer peripheral covering portion that covers the upper end portion of the outer peripheral surface of the rising portion from the rising portion.
An installation step of installing the newly installed cap tree having a second outer peripheral covering portion that covers the upper end portion of the outer peripheral surface of the rising portion on the upper portion of the rising portion.
When the lower end of the second outer peripheral covering portion installed on the rising portion is arranged at a position higher than the lower end position of the first outer peripheral covering portion before removal, of the outer peripheral surfaces of the rising portion. Kasagi replacement construction comprising a coating step of covering the range from the lower end of the second outer peripheral covering portion to the height at which the lower end of the first outer peripheral covering portion was located with a decorative curtain plate material. Method. The second outer peripheral covering portion includes an upper curtain plate portion that covers the upper end portion of the outer peripheral surface of the rising portion, a return piece that projects the lower end of the upper curtain plate portion toward the rising portion, and the return portion. It is provided with a lower curtain plate portion extending downward from the edge on the rising portion side of the piece.
The removal of the cap tree according to claim 1, wherein the coating step abuts the upper end portion of the decorative curtain plate material with the inside corner portion formed by the return piece and the lower curtain plate portion. Replacement construction method. The method for replacing a cap tree according to claim 1 or 2, wherein the covering step is for installing the decorative curtain plate material having an L-shaped cross section. In the installation process, a plurality of the newly installed cap trees are installed in the horizontal direction.
In the coating step, a plurality of the decorative curtain plate materials are installed in the horizontal direction.
The newly installed caps that are adjacent to each other in the horizontal direction are connected by a capgi joint cover that straddles the edges in the horizontal direction, and the decorative curtain plates that are adjacent to each other in the horizontal direction are connected to each other by a curtain that straddles the edges in the horizontal direction. Further equipped with a connecting process of connecting with a plate joint cover,
The method for replacing a cap tree according to any one of claims 1 to 3, wherein the connecting step aligns the joint positions of the cap tree joint cover and the curtain plate joint cover. .. In the connecting step, the cap tree joint cover is fixed to only one of the adjacent new cap trees with screws, and the curtain plate joint cover is fixed to the decorative curtain of one of the adjacent decorative curtain plate materials. The method for replacing a cap tree according to claim 4, wherein the cover is fixed only to a plate material with screws.

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