Method for reusing fire-resistant main structural parts and wooden main structural parts that constituted the fire-resistant main structural parts

Abstract

To provide a fire-resisting main structure part or the like with a configuration capable of reusing a ligneous main structure part.SOLUTION: A fire-resisting main structure part 1 according to the present invention comprises a ligneous main structure part 2 of an architectural structure and tabular fire-resisting covering materials 30 mounted onto an outside surface 21 of the ligneous main structure part 2. The tabular fire-resisting covering materials 30 are mounted onto the outside surface 21 of the ligneous main structure part 2 by fastening materials 6 that penetrates the tabular fire-resisting covering materials 30 and intrudes the ligneous main structure part 2. A reuse method of the ligneous main structure part which is configured as the fire-resisting main structure part includes constructing the architectural structure provided with the fire-resisting main structure part, taking out of an old ligneous main structure part in the fire-resisting main structure part from which the fastening materials and the fire-resisting covering materials removed when disintegrating the architectural structure, and using the old ligneous main structure part as resources.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fire-resistant main structural part of a building, which includes a wooden main structural part and a plate-shaped fire-resistant covering material attached to the outer surface of the wooden main structural part. [Background technology]

[0002] A fire-resistant main structural part is known that is configured to include wooden main structural parts such as pillars and beams of a building and a plate-shaped fire-resistant covering material such as gypsum board attached to the outer surface of the wooden main structural part (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-27161 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned fire-resistant main structural part, the plate-shaped fire-resistant covering material is attached to the outer surface of the wooden main structural part using a combination of adhesive and fastening materials such as staples. Therefore, when a building equipped with such fire-resistant main structural parts is constructed and the building is demolished after some time has passed, it becomes difficult to separate the fire-resistant plate-shaped covering material and adhesive from the wooden main structural parts, because adhesive is used to secure the fire-resistant plate-shaped covering material. Such wooden main structural parts mixed with other materials must be disposed of as mixed industrial waste, and there is a problem in that they cannot be used as resources. The present invention provides a fire-resistant main structural part and the like that has a configuration that allows the reuse of wooden main structural parts. [Means for solving the problem]

[0005] The fire-resistant main structure of the present invention comprises a wooden main structure of a building and a plate-shaped fire-resistant covering material attached to the outer surface of the wooden main structure, and the plate-shaped fire-resistant covering material is attached to the outer surface of the wooden main structure by fasteners that penetrate the plate-shaped fire-resistant covering material and into the wooden main structure. A fire-resistant main structural part is provided with a fire-resistant sheet material between the outer surface of the wooden main structural part and the plate surface of the plate-shaped fire-resistant covering material, and the wooden main structural part has a cross-sectional defect where a corner is cut out in a triangular cross-section along the material axis direction, and the fire-resistant sheet material covers at least the cut-out surface of the cross-sectional defect and is provided so as to cover the vicinity of the cut-out surface on the outer surface across the outer surfaces of the wooden main structural part adjacent to both sides of the cut-out surface, and a fire-resistant filler is filled between the fire-resistant sheet material covering the cut-out surface and the plate-shaped fire-resistant covering material. Therefore, it is possible to obtain a fire-resistant main structural part that allows the wooden main structural part to be reused. Along with Fastening materials and plate-shaped fireproof covering materials can be easily separated from the outer surface of the main wooden structure. And then, This improves the fire resistance of the main wooden structural parts and prevents the filler from adhering to the cutout surfaces and outer surfaces of the main wooden structural parts. Furthermore, the method for recycling the wooden main structural parts that constituted the above-mentioned fire-resistant main structural parts is characterized by constructing a building equipped with the above-mentioned fire-resistant main structural parts, and when the building is demolished, removing the old wooden main structural parts from which the fastening materials and fire-resistant covering materials have been removed, and using the old wooden main structural parts as resources.For example, the old wooden main structural parts can be used as they are when constructing another building, or the old wooden main structural parts can be chipped and used. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view showing the fire-resistant main structural part with the wooden main structural part exposed (Embodiment 1). [Figure 2] Cross-sectional view of the main fire-resistant structural part (embodiment 1). [Figure 3] FIG. 10 is a diagram showing the procedure for removing fastening materials and fire-resistant covering materials from a main fire-resistant structural part (Embodiment 1). DETAILED DESCRIPTION OF THE INVENTION

[0007] Embodiment 1 As shown in Figures 1 and 2, the fire-resistant main structural part 1 of embodiment 1 comprises a wooden main structural part 2 of a building and a plate-shaped fire-resistant covering material 30 attached to the outer surface 21 of the wooden main structural part 2, and the plate-shaped fire-resistant covering material 30 is attached to the outer surface 21 of the wooden main structural part 2 by fastening materials 6 that penetrate the plate-shaped fire-resistant covering material 30 and into the wooden main structural part 2. That is, the fire-resistant main structural member 1 of the first embodiment is configured such that the plate-shaped fire-resistant covering material 30 is attached to the outer surface 21 of the wooden main structural member 2 without using adhesive. In other words, the fire-resistant main structural part 1 of embodiment 1 is configured such that one plate surface of the plate-shaped fire-resistant covering material 30 faces the outer surface 21 of the wooden main structural part 2, and the fastening material 6 is passed through the plate-shaped fire-resistant covering material 30 from the other plate surface side of the plate-shaped fire-resistant covering material 30 and penetrates the wooden main structural part 2, so that one plate surface of the plate-shaped fire-resistant covering material 30 comes into contact with the outer surface 21 of the wooden main structural part 2 and the plate-shaped fire-resistant covering material 30 is attached to the outer surface 21 of the wooden main structural part 2, i.e., no adhesive is used to attach the plate-shaped fire-resistant covering material 30 to the outer surface 21 of the wooden main structural part 2.

[0008] The wooden main structural member 2 is, for example, a pillar or a beam made of CLT (Cross Laminated Timber), laminated timber, or LVL (Laminated Veneer Lumber). Columns are shown as an example of the wooden main structural member 2 in Figures 1 to 3. CLT is generally a type of wood constructed by gluing together multiple boards so that the grain directions of the boards cross at right angles, and is known as cross-laminated timber. Generally, laminated lumber is wood made by gluing together a number of boards so that the grain directions of the boards are parallel to each other. LVL is generally a type of wood made by laminating and gluing multiple veneers together in parallel with the grain direction of the veneers.

[0009] As shown in FIG. 1, the wooden main structural part 2 is configured to have a cross-sectional cutout 22, for example, where a corner is cut out in a triangular cross section along the material axis direction. The cross-sectional defect 22 is formed, for example, by chamfering the corners that form the boundaries between adjacent outer surfaces 21 of the wooden main structural part 2 to form planar cutout surfaces 23 that are continuous across the adjacent outer surfaces 21 of the wooden main structural part 2. For example, the angle α of the cutout surfaces 23 with the adjacent outer surfaces 21, 21 of the wooden main structural part 2 is set to 135°. In other words, the cross-sectional defect 22 is a portion where a corner of the wooden main structural part 2 has been removed, for example, in the shape of a right-angled isosceles triangle in cross section. For example, if the wooden main structural member 2 is a pillar with a square cross section, the four corners of the pillar are cut out along the material axis direction to form cross-sectionally missing portions 22 with triangular cross sections.

[0010] The plate-shaped fire-resistant covering material 30 is, for example, a fire-resistant board such as gypsum board or a volcanic vitreous composite board. The types of gypsum board include, for example, the so-called ordinary gypsum board, reinforced gypsum board which is more densely constructed than the gypsum board, and hard gypsum board which is even more densely constructed than the reinforced gypsum board, but any type of gypsum board can be used. Volcanic glass composite boards are fire-resistant materials made from mineral fibers such as rock wool and volcanic glass materials such as shirasu. For example, they are composite boards made by joining the surfaces of a compressed rock wool board, formed by compressing rock wool, to both surfaces of a compressed shirasu board, formed by compressing shirasu. As the volcanic glass composite plate, for example, "Dailite MU (registered trademark)" and "SD Fireproof Panel (registered trademark)" manufactured by Daiken Corporation may be used.

[0011] The fire-resistant main structural member 1 is configured with, for example, three fire-resistant covering layers 31, 32, and 33 as a fire-resistant covering member 3 that covers the outer surface 21 of the wooden main structural member 2. If the wooden main structural part 2 is, for example, a wooden column having a square cross section, a fire-resistant covering part 3 is provided to surround and cover each side surface of the wooden column. Furthermore, if the main wooden structural member 2 is, for example, a wooden beam with a square cross section, a fire-resistant covering member 3 is provided to surround and cover each side surface and the underside of the wooden beam.

[0012] The fastening material 6 is, for example, a staple, a screw such as a screw, or a nail. FIG. 2 shows an example in which a staple is used as the fastening material 6. The staple is a U-shaped fastening needle having a pair of needle portions arranged parallel (including parallel or approximately parallel) at a predetermined distance and a needle head portion that connects one end of the pair of needle portions, and is driven into the staple using a staple gun.

[0013] The fire-resistant main structural part 1 of embodiment 1 is configured such that the plate-shaped fire-resistant coating material 30 constituting the inner fire-resistant coating layer 31 is attached to the outer surface 21 of the wooden main structural part 2 only by fastening materials 6 that penetrate the plate-shaped fire-resistant coating material 30 and into the wooden main structural part 2. In other words, the outer surface 21 of the wooden main structural part 2 and the plate surface of the plate-shaped fire-resistant coating material 30 that constitutes the inner fire-resistant coating layer 31 are not bonded together with adhesive, and the fire-resistant main structural part 1 is in a state in which the plate-shaped fire-resistant coating material 30 is attached to the outer surface 21 of the wooden main structural part 2 using only fastening materials 6 so that the outer surface 21 of the wooden main structural part 2 and the plate surface of the plate-shaped fire-resistant coating material 30 that constitutes the inner fire-resistant coating layer 31 are in contact with each other.

[0014] In addition, in embodiment 1, a thin (for example, 1 mm or less) fire-resistant sheet material 4 is provided between the outer surface 21 of the wooden main structural part 2 and the plate surface of the plate-shaped fire-resistant coating material 30 that constitutes the inner fire-resistant coating layer 31. The sheet material 4 covers at least the cutout surface 23 of the cross-sectional defect portion 22 in the wooden main structural part 2, and is arranged to cover the portions of the outer surfaces 21, 21 of the wooden main structural part 2 adjacent to both sides of the cutout surface 23 near the cutout surface 23. The sheet material 4 may be, for example, a metal sheet material such as aluminum tape, stainless steel tape, or iron plate.

[0015] A fire-resistant filler 5 is filled between the sheet material 4 covering the cutout surface 23 of the cross-sectional missing portion 22 in the main wooden structural section 2 and the plate-shaped fire-resistant covering materials 30, 30. As the filler, for example, an inorganic filler may be used.

[0016] The plate-shaped fire-resistant covering material constituting the intermediate fire-resistant covering layer 32 is attached to the inner fire-resistant covering layer 31 using, for example, an adhesive and a fastening material (not shown). The plate-shaped fire-resistant covering material constituting the outer fire-resistant covering layer 33 is attached to the intermediate fire-resistant covering layer 32 using, for example, an adhesive and fastening material (not shown).

[0017] That is, as shown in Figures 1 and 2, the fire-resistant main structure 1 of embodiment 1 includes a fire-resistant covering 3 covering the wooden main structure 2, which comprises an inner fire-resistant covering layer 31 formed by attaching a plate-shaped fire-resistant covering material 30 to the outer surface 21 of the wooden main structure 2 so as to cover the outer surface 21 of the wooden main structure 2, an intermediate fire-resistant covering layer 32 formed by attaching a plate-shaped fire-resistant covering material 30 to the outer surface of the inner fire-resistant covering layer 31 so as to cover the outer surface of the inner fire-resistant covering layer 31, an outer fire-resistant covering layer 33 formed by attaching a plate-shaped fire-resistant covering material 30 to the outer surface of the intermediate fire-resistant covering layer 32 so as to cover the outer surface of the intermediate fire-resistant covering layer 32, and a fire-resistant filler material 5 filled between the fire-resistant sheet material 4 and the plate-shaped fire-resistant covering materials 30, 30.

[0018] Next, a method for constructing, for example, a fireproof pillar as the fireproof main structural part 1 according to the first embodiment will be described. First, the four corners of a wooden column with a square cross section serving as the wooden main structural member 2 are processed to form cross-sectionally missing portions 22, 22 . . . , and the column is fixed in a predetermined design position on the construction site. Next, a fire-resistant sheet material 4 is placed so as to cover the cutout surface 23 of the cross-sectional defect portion 22 and also to cover the portions of each side surface adjacent to the cutout surface 23 on both sides of the cutout surface 23. Next, an inner fire-resistant covering layer 31 is formed to cover the side surface of the column. In this case, the fastening material 6 is passed through the plate-shaped fire-resistant covering material 30 and the sheet material 4 from the other plate surface side of the plate-shaped fire-resistant covering material 30, and penetrates into the main wooden structural part 2, thereby attaching the plate-shaped fire-resistant covering material 30 to the side surface of the column. After the inner fire-resistant coating layer 31 is formed, the intermediate fire-resistant coating layer 32 is formed, and then the outer fire-resistant coating layer 33 is formed. Then, a filler 5 is filled between the plate-shaped fire-resistant covering materials 30 , 30 that form the inner fire-resistant covering layer 31 and the sheet material 4 that covers the cutout surface 23 of the cross-sectional missing portion 22 . This is how a fire-resistant column is constructed. Fire-resistant beams can also be constructed in the same way.

[0019] Furthermore, it is preferable that the fire-resistant main structural part 1 according to embodiment 1 is configured to have a fire resistance of 1 to 3 hours as defined in the "fire resistance performance" of Article 2, Paragraph 7 of the Building Standards Act, Fire-Resistant Structures.

[0020] According to the fire-resistant main structural part 1 of embodiment 1, a building equipped with the fire-resistant main structural part 1 can be constructed, and when the building is demolished, the old wooden main structural part can be obtained by removing the fastening material 6 and the fire-resistant covering material 30 from the fire-resistant main structural part 1, i.e., the old wooden main structural part without adhesive.Therefore, after the building is demolished, the old wooden main structural part without adhesive can be used as a resource without being disposed of as mixed industrial waste. For example, the old wooden main structural parts can be used as they are when constructing another building, or they can be chipped and used. The wood chips made from the old wooden main structural parts can be used as a resource, such as fuel for wood biomass power generation. In other words, a fire-resistant main structural part 1 having a structure that allows the wooden main structural part 2 to be reused can be obtained.

[0021] That is, a method can be realized in which a building equipped with the fire-resistant main structural part 1 having the above-described configuration is constructed, and when the building is demolished, the fastening materials 6 and the fire-resistant covering material 30 are removed from the fire-resistant main structural part 1, and the old wooden main structural part is taken out and used as a resource, such as for use as a wooden main structural part of another building, or for use as chips. In other words, after a building equipped with the fire-resistant main structural part 1 is demolished, a method can be realized in which the old wooden main structural part that constituted the fire-resistant main structural part 1 is reused.

[0022] Furthermore, according to the fire-resistant main structural part 1 of embodiment 1, the fire-resistant sheet material 4 is arranged to cover at least the cutout surface 23 of the cross-sectional defect 22 in the wooden main structural part 2, and also to cover the portion of the outer surfaces 21, 21 of the wooden main structural part 2 adjacent to both sides of the cutout surface 23 near the cutout surface 23, and the fire-resistant filler material 5 is filled between the fire-resistant sheet material 4 covering the cutout surface 23 and the plate-shaped fire-resistant covering materials 30, 30, i.e., in the space corresponding to the cross-sectional defect 22, and therefore the following effects are obtained.

[0023] First, the fire-resistant filler 5 is provided in the cross-sectional defect 22 formed by removing the corner of the main wooden structural part 2, which is prone to heat transfer and scorching, thereby improving fire resistance.

[0024] In addition, the fire-resistant sheet material 4 covers the cutout surface 23 of the cross-sectional defect 22 in the wooden main structural part 2 and is arranged to cover the area near the cutout surface 23 on the outer surfaces 21, 21 of the wooden main structural part 2 adjacent to both sides of the cutout surface 23.Since the fire-resistant sheet material 4 is interposed between the cutout surface 23 of the cross-sectional defect 22 in the wooden main structural part 2 and the fire-resistant filler material 5, it is possible to prevent the filler material 5 from adhering to the cutout surface 23 of the cross-sectional defect 22 in the wooden main structural part 2 and the outer surfaces 21.

[0025] In addition, the fire-resistant sheet material 4 covers the cutout surface 23 of the cross-sectional defect 22 in the wooden main structural part 2 and is arranged to cover the outer surfaces 21, 21 of the wooden main structural part 2 adjacent to both sides of the cutout surface 23, covering the area near the cutout surface 23 on the outer surfaces 21, 21, and the fastening material 6 is configured to penetrate the plate-shaped fire-resistant coating material 30 that constitutes the inner fire-resistant coating layer 31 and the sheet material 4, and to penetrate into the wooden main structural part 2, so that when a building that includes the fire-resistant main structural part 1 is demolished, the fastening material 6 and the fire-resistant coating material 30 can be easily removed from the fire-resistant main structural part 1. In other words, the fire-resistant sheet material 4 is sandwiched between the outer surface 21 of the wooden main structural part 2 and the plate surface of the plate-shaped fire-resistant covering material 30, and the fastening material 6 is configured to penetrate the plate-shaped fire-resistant covering material 30 and the sheet material 4 and penetrate into the wooden main structural part 2. Therefore, during dismantling, the fastening material 3 and the fire-resistant covering material 30 can be easily and reliably separated from the wooden main structural part 2 by pulling the sheet material 4 as follows.

[0026] Next, an example of a procedure for removing the fastening material 6 and the fire-resistant covering material 30 from the main fire-resistant structural portion 1 will be described with reference to FIG. First, as shown in FIG. 3(a), the outer fire-resistant coating layer 33 and the intermediate fire-resistant coating layer 32 are removed, leaving the inner fire-resistant coating layer 31. Next, as shown in FIGS. 3( b ) and 3 ( c ), the fire-resistant sheet material 4 is pulled in the direction A to separate the upper end surface of the plate-shaped fire-resistant covering material 30 from the outer surface 21 of the wooden main structural part 2 . Furthermore, as shown in Figure 3(d), by inserting a peeling tool H such as a spatula between the upper plate surface of the plate-shaped fire-resistant covering material 30 and the outer surface 21 of the wooden main structural part 2 while further pulling the sheet material 4 in the direction A, it becomes possible to easily and reliably separate the plate-shaped fire-resistant covering material 30 and the fastening material 6 from the outer surface 21 of the wooden main structural part 2, as shown in Figure 3(e). The fire-resistant sheet material 4 is made of a sheet material having such strength that it will not easily break when pulled as described above. As described above, the fastening materials 6 and fire-resistant covering material 30 of the fire-resistant main structural part 1 can be removed easily and reliably, in other words, the fastening materials 6 and fire-resistant covering material 30 can be separated from the wooden main structural part 2, and a wooden main structural part can be obtained from which the fastening materials 6 and fire-resistant covering material 30 have been neatly removed.

[0027] In other words, in the present invention, when forming a fire-resistant main structural part 1 in which the outer surface 21 of a wooden main structural part 2 of a building is covered with a plate-shaped fire-resistant covering material 30, the plate-shaped fire-resistant covering material 30 is attached to the outer surface 21 of the wooden main structural part 2 without using adhesive, using fastening materials 6 that penetrate the plate-shaped fire-resistant covering material 30 and penetrate into the wooden main structural part 2.Therefore, when the building is demolished, the old wooden main structural part can be taken out of the fire-resistant main structural part 1 with the fastening materials 6 and fire-resistant covering material 30 removed, and the taken-out old wooden main structural part can be used as a wooden main structural part (column, beam, etc.) when constructing another building, or the old wooden main structural part can be chipped and used. In other words, after a building having the above-described fire-resistant main structural part 1 is demolished, it becomes possible to realize a method for reusing the wooden main structural part 2 that constitutes the fire-resistant main structural part 1.

[0028] Embodiment 2 In embodiment 1, a fire-resistant main structural part 1 having a cross-sectional defect 22 and a fire-resistant filler 5 is exemplified, but the fire-resistant main structural part may be configured without these cross-sectional defect 22 and fire-resistant filler 5.

[0029] Embodiment 3 In embodiment 1, fire-resistant sheet material 4 is provided to cover the cutout surface 23 of the cross-sectional defect 22 in the wooden main structural part 2 corresponding to the corner of the wooden main structural part 2. However, in a fire-resistant main structural part that does not have a cross-sectional defect 22 or a filler 5, as in embodiment 2, the sheet material 4 may be provided on each outer surface of the wooden main structural part, or may be provided to cover all of the outer surfaces around the wooden main structural part.

[0030] Furthermore, in the case of a fire-resistant main structural part that does not have a cross-sectional missing portion 22 or a filler material 5, as in embodiment 2, a fire-resistant wire material such as an iron wire or a fire-resistant mesh sheet such as a wire mesh may be used instead of the fire-resistant sheet material.

[0031] According to the fire-resistant main structural parts of embodiments 2 and 3, it is possible to easily and reliably remove fastening materials and fire-resistant covering materials from the wooden main structural parts, and it is possible to provide fire-resistant main structural parts that enable the wooden main structural parts to be reused, thereby realizing a method of reusing old wooden main structural parts that constituted the fire-resistant main structural parts.

[0032] Embodiment 4 The main fire-resistant structural portion may be configured without the cross-sectional missing portion 22, the filler material 5, the fire-resistant sheet material 4, wire material, or mesh sheet. In other words, the fire-resistant main structural part in the present invention comprises a wooden main structural part of a building and a plate-shaped fire-resistant covering material attached to the outer surface of the wooden main structural part, and the plate-shaped fire-resistant covering material is attached to the outer surface of the wooden main structural part by fastening materials that penetrate the plate-shaped fire-resistant covering material and into the wooden main structural part. Even in the case of a fire-resistant main structural part with this configuration, the desired objective can be achieved. That is, a fire-resistant main structural part that allows the reuse of wooden main structural parts can be provided, and a method for reusing old wooden main structural parts that constituted the fire-resistant main structural part can be realized.

[0033] The main wooden structural parts of a building that constitute the main fire-resistant structural parts of the present invention are main wooden structural parts made up of wooden members such as wooden columns and wooden beams in a building with a brace structure in which wooden columns and wooden beams are pin-jointed, wooden columns and wooden beams in a building with a rigid-frame structure in which wooden columns and wooden beams are rigidly joined, and wooden floors and wooden walls in a building with a wall structure in which wooden floors and wooden walls are joined, but do not include wooden underlayment members of walls such as partition walls to which plate-shaped fire-resistant covering materials such as gypsum boards are attached with fasteners such as screws. That is, the main wooden structural part of a building that constitutes the fire-resistant main structural part of the present invention is a main wooden structural part that is made up of wooden members excluding the wooden base members of the wall. [Explanation of symbols]

[0034] 1 fire-resistant main structural part, 2 wooden main structural part, 3 fire-resistant covering part, 4 fire-resistant sheet material, 5 fire-resistant filling material, 6 fastening material, 21 outer surface of wooden main structural part, 22 Cross-sectional defect of main wooden structural part, 23 Cutout surface of cross-sectional defect.

Claims

1. A building comprises a main wooden structural part of a building and a plate-shaped fire-resistant covering material attached to the outer surface of the main wooden structural part, The plate-shaped fire-resistant covering material is a fire-resistant main structural part attached to the outer surface of the wooden main structural part by a fastening material that penetrates the plate-shaped fire-resistant covering material and enters the wooden main structural part, A fire-resistant sheet material is provided between the outer surface of the main wooden structure and the plate surface of the plate-shaped fire-resistant covering material, The main wooden structural part has a cross-sectional defect part in which a corner part is cut out in a triangular cross section along the material axis direction, A fire-resistant main structural part characterized in that a fire-resistant sheet material covers at least the cutout surface of the cross-sectional defect portion and is arranged to cover the outer surfaces of the wooden main structural parts adjacent to both sides of the cutout surface, near the cutout surface on the outer surface, and a fire-resistant filler material is filled between the fire-resistant sheet material covering the cutout surface and the plate-shaped fire-resistant covering material.

2. A method for reusing wooden main structural parts that constituted fire-resistant main structural parts, comprising constructing a building equipped with the fire-resistant main structural parts described in claim 1, and when demolishing the building, removing the old wooden main structural parts from which the fastening materials and fire-resistant covering materials have been removed from the fire-resistant main structural parts, and using the old wooden main structural parts as resources.

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