KR102643982B1 - Wood plate for building material - Google Patents

Abstract

The present invention relates to a board for building materials used as a material for staircase steps, doors, etc., and more specifically, to the detailed aesthetics of solid wood, such as color, surface texture, and finishing quality of the wood. It is a construction material that not only maximizes strength and durability to compensate for the shortcomings of wooden boards such as bending, cracking, and breaking while maintaining the design feel of solid wood, but also significantly reduces manufacturing costs compared to solid wood. It's about plates.

Description

Wood plate for building material}

The present invention relates to a board for building materials used as a material for staircase steps, doors, etc., and more specifically, to the detailed aesthetics of solid wood, such as color, surface texture, and finishing quality of the wood. It is a construction material that not only maximizes strength and durability to compensate for the shortcomings of wooden boards such as bending, cracking, and breaking while maintaining the design feel of solid wood, but also significantly reduces manufacturing costs compared to solid wood. It's about plates.

In general, the staircase of a building is the most three-dimensional structure in the interior space, so it serves as a good interior element to express various personalities.

However, the reality is that conventional stairs have limited materials and poor finishing quality to accommodate recent interior trends.

In the case of solid wood, which is the representative material for stair treads and is the most eco-friendly yet provides a sophisticated aesthetic, solid wood and laminated wood were cut and constructed on site, and bending and cracking were unavoidable due to the material properties.

In other words, the biggest advantage of stairs using solid wood is the excellent aesthetics provided by the material, and in particular, when constructed as exposed stairs, a single design concept can be maintained up to the side of the stairs, so the scope of use is wide.

However, wooden stair materials are not only expensive, but, as mentioned above, have low resistance to cracks, bending, and deformation during use, leading to a significant decrease in durability.

As another example, laminated wood staircase is a staircase made by joining logs cut to a certain size and has the advantage of being cheaper than solid wood and having less deformation because it is joined side by side. However, laminated wood staircases have the disadvantage of having poor aesthetics because the shape of the wood joined together is exposed to the outside.

These stair materials are widely used in staircase structures, such as being used only as the treads of a stair structure, installed simultaneously on the treads and treads (vertical surfaces of stairs), placing the stair materials only as treads on exposed metal plates, or wrapping the tread metal with the stair materials. can be used

On the other hand, deformation is inevitable, although to a small extent, not only in the solid wood mentioned above but also in the laminated solid wood staircase. In particular, when such staircases are constructed in outdoor facilities, they are exposed to changes in outdoor temperature, and are cold in the winter or hot in the summer. As it expands or contracts repeatedly, internal cracks and bending deformation occur significantly.

If the stair treads are bent or damaged, the flatness is not uniform, which not only makes it difficult to use the facility conveniently, but also causes serious safety problems.

Public patent 10-2014-0110308

The present invention was created to solve the above-mentioned problems in the prior art in consideration of the above-mentioned problems in the prior art. In the construction board used as a material for staircase structures, doors, etc., the detailed aesthetics of solid wood, for example, solid wood, are created. The color, surface texture, and finishing quality of the product are implemented as is, preserving the design feel of solid wood, while maximizing strength and durability to compensate for the shortcomings of wood plates such as bending, cracking, and breaking, as well as lowering the manufacturing cost compared to solid wood. The purpose is to provide plates for building materials that can significantly reduce costs.

The present invention is a means for achieving the above object, comprising: a first plywood section made of a plywood structure in which a plurality of first wooden boards are laminated and joined together at the top and bottom and having a first inclined surface inclined at a 45 degree angle at the front end; and a plywood structure in which a plurality of second solid wood boards are laminated and joined back and forth, and has a second inclined surface parallel to the first inclined surface at the top, and is joined to the front end of the first plywood section so that the second inclined surface is in contact with the first inclined surface. 2 plywood sections; and wherein each of the first and second wooden boards is connected vertically, and the first and second wooden boards connected perpendicularly to each other are wooden boards of the same thickness and material. do.

In addition, the third plywood part is simultaneously bonded and fixed to the first plywood part and the second plywood part at a point between the lower surface of the first plywood part and the rear surface of the second plywood part. It is characterized in that it further includes a.

In addition, the third plywood part is a core member; A top plate joined to the upper surface of the core member; And a lower plate joined to the lower surface of the core member.

In addition, the core member includes an upper jacket plate that is joined to the lower surface of the upper plate and has an upper guide groove of a certain depth recessed in the lower surface; a lower jacket plate joined to the upper surface of the lower plate and having a lower guiding groove recessed to a certain depth at a corresponding point of the upper guiding groove on the upper surface; And it is interposed between the upper jacket plate and the lower jacket plate, and has a flat plate shape at the corresponding point between the upper guide groove and the lower guide groove, and is curved and deformed into a wave shape toward the inside of the upper guide groove and the lower guide groove when heat is transferred. It is characterized in that it includes a core plate of a thin metal plate structure on which deformable pieces of a bimetal material are formed.

In addition, the deformable piece includes a first bimetal bent in an arc shape toward the upper guide groove during heat transfer; And a second bimetal connected to the first bimetal and bent in an arc shape toward the lower guide groove when heat is transferred, wherein a first upper support of a certain height is protruding from the front end of the lower surface of the upper jacket plate, At the rear end of the lower surface, a second upper support is formed to protrude to the same level as the protrusion height of the first upper support, and at the front end of the upper surface of the lower jacket plate, a first lower support connected to the first upper support is formed to protrude at a certain height, At the rear end of the upper surface, a second lower support connected to the second upper support is formed to protrude at a certain height, and an upper jacket plate and a lower plate are formed between the first upper support and the first lower support and the second upper support and the second lower support, which are joined to each other. A charging space is formed by spacing the jacket plates so that the core plate is charged into the charging space. A plurality of core plates are arranged at equal intervals along the left and right directions, and the upper or lower surface of each of the plurality of core plates is fixed. A high fixing pin is formed to protrude, and a network of a mesh structure is interposed between adjacent core plates to connect adjacent core plates, and the fixing pin passes through the network overlapping the adjacent core plate and is connected to the upper jacket plate or lower jacket plate. It is characterized by being inserted and fixed into.

The present invention is a building material board used as a material for staircase steps, doors, etc., and embodies the detailed aesthetics of solid wood, for example, the color, surface texture, and finishing quality of solid wood, thereby improving the design of solid wood. While preserving the feel, it not only maximizes strength and durability to compensate for the shortcomings of wooden boards such as bending, cracking, and breaking, but also provides the advantageous effect of significantly reducing manufacturing costs compared to solid wood.

1 is a diagram showing a plate for building materials according to the present invention.
Figures 2 and 3 are diagrams showing an example in which the plate for building materials according to the present invention is applied.
Figure 4 is a view showing a solid wood staircase.
Figure 5 is a diagram showing a laminated wood staircase.
Figure 6 is a view showing the corner joint portion of the first plywood part and the second plywood part.
Figure 7 is a view showing a damaged staircase.
Figure 8 is a diagram showing the configuration of one side of a plate for building materials according to the present invention.
Figure 9 is a diagram showing the exploded configuration of a plate for building materials according to the present invention.
Figure 10 is a view showing an example in which the building material plate according to the present invention is applied as a stepping stone for a staircase structure.
Figure 11 is a view showing a board for building materials to which a modified example of the third plywood part is applied.
Figure 12 is a diagram showing the configuration of the third plywood part.
Figure 13 is a diagram illustrating a state in which a deformable piece is bent and deformed.
Figure 14 is a diagram showing the exploded configuration of the core member.
Figure 15 is a diagram showing the exploded configuration of the core plate and the connection network.
Figure 16 is a diagram showing a planar configuration in which a network is connected between adjacent core plates.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This example is provided to more completely explain the present invention to those with average knowledge in the art. Therefore, the shapes of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that identical members in each drawing may be indicated by the same reference numerals. Detailed descriptions of well-known functions and configurations that are judged to unnecessarily obscure the gist of the present invention are omitted.

The board for building materials (hereinafter referred to as board) according to the present invention can be broadly defined as including a first plywood part 10, a second plywood part 20, and a third plywood part 100.

First, the first plywood part 10 and the second plywood part 20 constitute the exterior of the board, and when the board is used as a building material such as a staircase or door, it can form the outermost surface of the building material.

The first plywood part 10 and the second plywood part 20 may be made entirely of solid wood, but may be made of a plywood structure in which thin solid wood sheets are joined in multiple layers, rather than solid wood.

More specifically, the first plywood part 10 is made of a plywood structure in which a plurality of first wooden boards 11 are laminated and joined together at the top and bottom, and has a structure having a first inclined surface 12 inclined at a 45 degree angle at the front end. You can.

At this time, the uppermost first solid wood plate 11a of the plurality of first wood plates 11 is a wood plate that serves as a finishing material directly exposed to the outside, and its thickness is the lower first wood plate 11a. ) It is desirable to form it at least twice as thick as that of the For example, it is more preferable that the thickness of the first wood board 11a is set within the range of 4 to 6 mm.

The reason why the thickness of the top first wooden board 11a is relatively thick compared to the remaining first wooden boards 11 is that after the joining process of the first plywood part 10 and the second plywood part 20, the first wooden board 11a During the fillet processing of the joint portion of the plywood part 10 and the second plywood part 20, the uppermost lower first wood board 11a is exposed to the outside and the first plywood part 10 and the second plywood part 20 are processed. This is to ensure that the border point of (20) does not appear relatively prominent, and to minimize damage to the external surface due to scratches, etc.

The remaining first wooden boards 11 laminated below the uppermost first wooden board 11a provide a sense of thickness to the first plywood part 10, and cause shrinkage, expansion, and distortion of the first plywood part 10. It serves as a frame or buffer structure to suppress deformation of the back.

Next, the second plywood part 20 may be made of a plywood structure in which a plurality of second wooden boards 21 are laminated and joined back and forth.

That is, if the first plywood part 10 has a structure in which a plurality of first wooden boards 11 are laminated and joined vertically, the second plywood part 20 is arranged perpendicularly to the first plywood part 10. The plurality of second wooden boards 21 may be implemented in a structure in which the front and rear stacked joints are joined.

Accordingly, the second plywood section 20 can be viewed as the same as the first plywood section 10 except that it is disposed perpendicular to the first plywood section 10.

A second inclined surface 22 parallel to the first inclined surface 12 may be formed at the top of the second plywood part 20, and a second plywood part 20 may be formed at the front end of the first plywood part 10. When joining, the first plywood part 10 can be joined to the first plywood part 10 so that the second inclined surface 22 is in contact with the first inclined surface 12.

When the first plywood part 10 and the second plywood part 20 are combined, an approximately “L” shaped structure is formed.

Bonding as used in this embodiment may mean injecting a binder or adhesive between adjacent substrates to mechanically connect them.

Again, among the plurality of second wooden boards 21 constituting the second plywood part 20, the frontmost second wooden board 21a is a wooden board that serves as a finishing material that is directly exposed to the outside, and its thickness is It is desirable to form it to be at least twice as thick as the remaining second wooden board 21.

The reason for making the thickness of the frontmost second wooden board (21a) relatively thick compared to the remaining second wooden boards (21) is the same as in the above-described first plywood part (10), and can be referred to from the description. .

The remaining second wooden boards 21 laminated to the rear of the frontmost second wooden board 21a provide a sense of thickness to the second plywood part 20, and cause contraction, expansion, and distortion of the second plywood part 20. The fact that it serves as a framework structure to suppress deformation of the back is the same as described above.

When the first plywood part 10 and the second plywood part 20 of this configuration are joined to each other, each of the first wooden boards 11 and the second wooden boards 21 placed in corresponding positions are connected vertically and are aligned with each other. The first and second wooden boards 11 and 21 connected vertically may be composed of wooden boards of the same thickness and material.

For example, the first wooden board 11a at the top and the second wooden board 21a at the front are connected perpendicularly to each other and are made of the same thickness and material to give a sense of external unity.

The first solid wood board (11a) at the top and the second solid wood plate (21a) at the front serve as external finishing materials and are thicker than other solid wood plates, so that they have sufficient thickness during the filleting process, so that the remaining first solid wood plates (21a) are used as external finishing materials. External exposure of (11) and the second wooden board (21) can be suppressed.

Next, the third plywood part 100 improves the bonding force between the first plywood part 10 and the second plywood part 20, and deforms the first plywood part 10 and the second plywood part 20. It plays a core role in suppressing.

The first plywood part 10 and the second plywood part 20 are both made of wood, but the third plywood part 100 is a combination of wood and metal, and the first plywood part 10 and the second plywood part ( 20) It provides uniformity in appearance and superior rigidity compared to wood.

The third plywood part 100 is connected to the first plywood part 10 at a point between the lower surface of the first plywood part 10 and the back of the second plywood part 20 to limit external exposure when used as a stepping board or ledge of a staircase structure. ) and the second plywood part 20 can be bonded and fixed at the same time.

Therefore, when the third plywood part 100 is positioned and constructed in a downward direction, the upper surface of the stepping board is substantially composed of the first plywood part 10, and the third plywood part 100 is hidden by the staircase structure and is exposed to the outside. It is not exposed directly.

The third plywood part 100 is largely a plywood structure including a core member 110, an upper plate 120 joined to the upper surface of the core member 110, and a lower plate 130 joined to the lower surface of the core member 110. It can be done with

The core member 110 constitutes the central portion of the third plywood portion 100, the upper plate 120 is between the core member 110 and the first plywood portion 10, and the lower plate 130 is the core member 110. ) It can be arranged on the bottom.

The upper plate 120 and lower plate 130 cover the core member 110 from the top and bottom, respectively, to reinforce strength and perform an insulating function.

The core member 110 is a composition that includes a core plate 113 made of metal and reinforces the strength at the inner center of the wood plywood structure, which may be relatively weak, to resist deformation due to external forces when repeated loads are applied. The overall durability can be improved by increasing the strength of metal.

More specifically, the core member 110 may be largely illustrated as including an upper jacket plate 111, a lower jacket plate 112, and a core plate 113.

The upper jacket plate 111 and the lower jacket plate 112 are arranged at the top and bottom of the core plate 113, respectively, to accommodate the core plate 113 inside, and the core plate 113 made of metal is heated. When it expands, it accommodates this expansion and prevents the inside of the core member 110 from cracking due to expansion of the core plate 113.

If the upper jacket plate 111 and the lower jacket plate 112 are strongly bonded to the core plate 113 with adhesive or the like, the metal core plate 113 thermally expands as it is exposed to heat, causing the core plate ( 113) In addition to causing cracks in the surrounding wood and destroying adhesion in the process, interfering with the expansion and contraction of the metal causes thermal stress to occur inside the core plate 113.

Therefore, the upper jacket plate 111 and the lower jacket plate 112 are respectively bonded to the lower surface of the upper plate 120 and the upper surface of the lower plate 130 with adhesive, etc., and the core plate 113 is completely fixed at the point between them. Instead, it is locally fixed and stored, and at the same time, it has a unique structure that can suppress the volume change due to linear expansion in the core plate 113 itself as much as possible, so that even if the core plate 113 linearly expands internally, this expansion phenomenon is prevented. It has a structure that can suppress distortion of surrounding structures as much as possible.

More specifically, the upper jacket plate 111 is a plate-shaped structure with an area corresponding to the area of the upper plate 120, and an upper guide groove 111a of a certain depth is recessed on the lower surface, and a plate of a certain height is formed at the front end of the lower surface. 1 The upper support 111b may be formed to protrude, and the second upper support 111c may be protruded at the rear end of the lower surface to the same height as the protruding height of the first upper support 111b.

In other words, a first upper support (111b) and a second upper support (111c) protrude from the front and rear ends of the lower surface of the upper jacket plate 111, respectively, and the first upper support (111b) and the second upper support (111c) The upper guide groove 111a may be recessed to a certain extent in the section in between.

A portion of the core plate 113 deformed by heat can be accommodated in the upper guide groove 111a, and the first upper support 111b and the second upper support 111c include the lower jacket plate 112, which will be described later. 1 The lower support 112b and the second lower support 112c may be bonded and fixed.

The lower jacket plate 112 is vertically symmetrical to the upper jacket plate 111 and has the same structure as the upper jacket plate 111 except for the arrangement direction.

For example, the lower jacket plate 112 has a lower guide groove (112a) recessed to a certain depth at a corresponding point of the upper guide groove (111a) on the upper surface, and a first upper support plate (111b) connected to the first upper support (111b) at the front end of the upper surface. The lower support 112b may be formed to protrude at a certain height, and the second lower support 112c connected to the second upper support 111c may be formed to protrude at a certain height at the rear end of the upper surface.

That is, the upper jacket plate 111 and the lower jacket plate 112 have a first upper support (111b), a first lower support (112b), a second upper support (111c), and a second lower support (112c) joined to each other. It is arranged to be spaced apart at a certain height up and down, and a charging space (S) can be formed between the upper jacket plate 111 and the lower jacket plate 112.

The joint area where the upper jacket plate 111 and the lower jacket plate 112 are substantially joined is the first upper support (111b), the first lower support (112b), the second upper support (111c), and the second lower support ( It is limited to part 112c), and parts other than this are spaced apart from each other to form a charging space (S) so that the core plate 113 is charged into the charging space (S).

At this time, the charging space (S) is formed as a space larger than the length, area, or volume when the core plate 113 is thermally expanded to its maximum, so that the core plate 113 is connected to the upper jacket plate 111 and the lower jacket plate 112. ) so as not to crack it.

Next, the core plate 113 is a thin metal plate structure interposed between the upper jacket plate 111 and the lower jacket plate 112, especially inside the charging space S, and is substantially the first plywood portion 10. It is a composition responsible for improving the strength of.

The core plate 113 is exemplified as a flat plate shape, and has a flat plate shape at the corresponding point between the upper guidance groove 111a and the lower guidance groove 112a. When heat is transferred, the upper guidance groove 111a and the lower guidance groove 112a ) It may have a structure in which a deformable piece 113a made of a bimetal material is formed that is curved and deformed in a wave shape to face inward.

That is, the core plate 113 has a flat plate shape under normal circumstances, but when the external temperature rises rapidly, such as in the summer, and heat is applied to the plate, linear expansion occurs in the entire area, while the section where the deformed piece 113a is formed In this case, as the structure of the deformable piece 113a is deformed into a wave shape, the overall linear expansion of the core plate 113 is compensated for by contraction in a part, thereby suppressing the length of the core plate 113 from becoming longer.

At this time, since the deformable piece 113a is formed at a corresponding position between the upper guide groove 111a and the lower guide groove 112a, it can accommodate parts of the deformable piece 113a that are deformed into a wave shape to prevent cracking. do.

The deformable piece 113a uses the principle of bimetalling, in which two thin metal plates with different expansion coefficients are attached and when the temperature rises, the one with the higher thermal expansion coefficient of the two metals expands more and bends toward the metal with the lower thermal expansion coefficient. For example, heat It is connected to the first bimetal (b1) and the first bimetal (b1), which is bent in a convex arc shape toward the upper guide groove (111a) when transferring heat, and is bent in a convex arc shape toward the lower guide groove (112a) when heat is transferred. The base may be exemplified as including a second bimetal (b2).

That is, the deformable piece 113a is composed of a first bimetal (b1) and a second bimetal (b2) bent in an arc shape in different directions so that the deformable piece 113a can be bent into a wave shape according to heat transfer. do. The number and length of the bimetals constituting the deformable piece 113a may be appropriately modified, and in some cases, the deformable piece 113a may be bent in only one direction using only a single bimetal.

The bending deformation of the deformable piece 113a is at a level that sufficiently compensates for the linear expansion of the core plate 113 itself, and it is natural that the front-back linear expansion of the core plate 113 within the charging space S can be suppressed.

Meanwhile, although not shown, both front and rear ends of the deformable piece 113a may be made of an elastic material such as rubber to prevent the entire core plate 113 from being distorted even if bending deformation of the deformable piece 113a occurs. In addition, the deformable piece 113a itself may not be made of bimetal, but may be implemented as a structure permanently curved and deformed in a wave shape toward the inside of the upper guide groove 111a and the lower guide groove 112a. In this case, the deformable piece 113a itself may act as a stopper to suppress the forward and backward movement of the core plate 113.

Meanwhile, the number of core plates 113 can vary depending on the left and right width of the plate to be constructed.

For example, it is preferable that the upper jacket plate 111 and the lower jacket plate 112 have the same area as the upper plate 120 and the lower plate 130, respectively, and since the core plate 113 is made of metal, it is difficult to process. Considering this, several relatively small areas are used to charge and install them in the charging space (S).

Therefore, at the manufacturing site, the core plate 113 of one standardized size can be used without cutting the area of the core plate 113 to match the upper jacket plate 111 and the lower jacket plate 112, and the size of the plate material can be used. As the area increases, an efficient manufacturing method is selected by adding the number of core plates 113.

At this time, a plurality of core plates 113 may be arranged at equal intervals along the left and right directions, and the upper or lower surface of each core plate 113 may be used to temporarily fix the core plates 113 within the charging space (S). A fixing pin (113b) of a certain height is formed to protrude.

Therefore, the core plate 113 can be locally fixed to the adjacent upper jacket plate 111 or lower jacket plate 112 to set and maintain the gap between adjacent core plates 113. At this time, the adjacent core plate 113 ), a mesh-structured connection network 114 is interposed between adjacent core plates 113, taking into account the strength of the space between adjacent core plates 113 and the adjacent support force between adjacent core plates 113, so that adjacent core plates 113 can be connected.

The connection network 114 may be made of a metal mesh plate structure, and the size of the mesh hole formed in the connection network 114 is larger than that of the fixing pin 113b, allowing the fixing pin 113b to pass through.

Accordingly, the fixing pin 113b can be inserted and fixed into the upper jacket plate 111 or the lower jacket plate 112 while passing through the connection network 114 partially overlapping the adjacent core plate 113, and therefore, separately. The connecting network 114 can be connected and fixed between adjacent core plates 113 without any connecting means.

Since the connecting network 114 is a metallic material, it can provide a certain strength to the connection between adjacent core plates 113, and in particular, the fixing pin 113b can penetrate any point of the connecting network 114. Based on the fact that the location of the connection point of the core plate 113 and the network 114 is somewhat free, the spacing between the core plates 113, the amount of overlap between the network 114 and the core plate 113, etc. can be easily adjusted as needed. It provides the advantageous effect of being able to adjust and connect.

The embodiments of the present invention described above are merely illustrative, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible. Therefore, it will be understood that the present invention is not limited to the forms mentioned in the detailed description above. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the attached patent claims. In addition, the present invention should be understood to include all modifications, equivalents and substitutes within the spirit and scope of the present invention as defined by the appended claims.

10: First plywood part
20: Second plywood section
100: Third plywood part

Claims (5)

A first plywood part made of a plywood structure in which a plurality of first wooden boards are laminated and joined together at the top and bottom and has a first inclined surface inclined at a 45 degree angle at the front end; and
It consists of a plywood structure in which a plurality of second wooden boards are laminated and joined back and forth, and has a second inclined surface parallel to the first inclined surface at the top, and a second wooden board is joined to the front end of the first plywood part so that the second inclined surface is in contact with the first inclined surface. Includes a plywood part,
Each of the first and second wooden boards is connected vertically, and the first and second wooden boards connected perpendicularly to each other are wooden boards of the same thickness and material,
It further includes; a third plywood portion that is simultaneously bonded and fixed to the first plywood portion and the second plywood portion at a point between the lower surface of the first plywood portion and the rear surface of the second plywood portion,
The third plywood department,
core member;
A top plate joined to the upper surface of the core member; and
A plate for building materials comprising a lower plate joined to the lower surface of the core member. delete delete In claim 1,
The core member is,
an upper jacket plate joined to the lower surface of the upper plate and having an upper guide groove of a certain depth recessed in the lower surface;
a lower jacket plate joined to the upper surface of the lower plate and having a lower guiding groove recessed to a certain depth at a corresponding point of the upper guiding groove on the upper surface; and
A bimetal is interposed between the upper jacket plate and the lower jacket plate and has a flat plate shape at a corresponding point between the upper and lower guiding grooves, but is curved and deformed into a wave shape toward the inside of the upper and lower guiding grooves when heat is transferred. A sheet material for building materials comprising a core plate of a thin metal plate structure on which deformed pieces of the material are formed. In claim 4,
The modified piece is,
A first bimetal bent in an arc shape toward the upper guide groove during heat transfer; and
It includes a second bimetal connected to the first bimetal and bent in an arc shape toward the lower guide groove during heat transfer,
A first upper support of a certain height is protruded from the front end of the lower surface of the upper jacket plate, and a second upper support is protruded from the rear end of the lower surface to the same level as the protrusion height of the first upper support,
At the front end of the upper surface of the lower jacket plate, a first lower support connected to the first upper support is formed to protrude at a certain height, and at the rear end of the upper surface, a second lower support connected to the second upper support is formed to protrude at a certain height and are joined to each other. A charging space is formed between the first upper support and the first lower support and the second upper support and the second lower support by separating the upper jacket plate and the lower jacket plate so that the core plate is charged into the charging space,
A plurality of core plates are arranged at equal intervals along the left and right directions,
A fixing pin of a certain height is formed to protrude from the upper or lower surface of each of the plurality of core plates,
A structure characterized in that a network of mesh structures is interposed between adjacent core plates to connect adjacent core plates, and the fixing pins are inserted and fixed into the upper jacket plate or lower jacket plate while passing through the network overlapping the adjacent core plates. Plate for materials.