KR101579726B1

KR101579726B1 - Coner Bead for Gypsum Plaster Boards with Improved Constructability

Info

Publication number: KR101579726B1
Application number: KR1020150101439A
Authority: KR
Inventors: 김범진
Original assignee: 김범진; 주식회사 락소
Priority date: 2015-07-17
Filing date: 2015-07-17
Publication date: 2015-12-23
Also published as: WO2017014490A1

Abstract

Disclosed in the present invention is a technology on a corner bead for gypsum plaster boards configured to effectively install gypsum plaster boards on the corner part of a concrete building. According to the present invention, the corner bead for gypsum plaster boards provides a finishing process with precise dimensions regardless of type and process style of a building, and significantly reducing the process time and workforce through a structure which can quickly be installed in a stable mode. To achieve the above purpose, the present invention has a first vertical plate and a second vertical plate protruded to both sides of an X shaft surface, and third and fourth vertical plates protruded to both sides of a Y shaft surface. The vertical plate protruded to both sides comprises a corner column which forms at least a pair of opposite fixated processes.

Description

[0001] Cone Bead for Gypsum Plaster Boards with Improved Constructability [

The present invention relates to a corner bead for a gypsum board having improved workability for installing a gypsum board on a concrete structure, comprising: a body having a hollow portion; first and second vertical plates protruding from both sides of the x- And a third and fourth vertical plates protruding on both sides of the first and second vertical plates and having a pair of fixing protrusions opposed to each other inside the first and second vertical plates and inside the third and fourth vertical plates, Is a technical field of corner beads.

Generally, in closing the interior of a building, corner portions intersect the ends of the gypsum board to form inners or out corners.

If the gypsum board is exposed without a separate corner finish during the finishing process, the corner finish portion may be easily damaged due to low durability and adhesive force of the gypsum board, or the adhesive portion may fall off.

In order to solve such a problem, a molding process is usually performed as shown in FIG. 1, in which the joint tape 80 is attached to a corner portion of a gypsum board, and a compound paint ( 81 is applied, and finally the molding 82 is covered.

The molding process can prevent the damage and drop-off of the corner finish area, but the molding process consumes much time for drying the compound paint 81 applied by the wet process, 81 have a problem that a large amount of work time and manpower are involved in the process, for example, the molding must be secondarily polished to be covered.

In order to solve such a problem, a technique relating to a corner bead for finishing a corner of a building is known. For example, two plate surfaces bent in a " And a wall board including a drinking hole is disclosed in Korean Utility Model Registration No. 20-0182663.

The Registration Utility Model No. 20-0182663 discloses that through the flange of the overhang column, the overhang is easily positioned on the corner of the building and the end of the gypsum board is in contact with the section support plate included in the overhang , The corner of the building can be closed.

As a result, the gypsum board can be prevented from being damaged or detached from the corner portion, and the corner portion can be more easily closed than the molding process by the placement of the gypsum board in place of the crossing portion of the gypsum board.

However, in the above-mentioned Registration Utility Model No. 20-018663, when the overhang is installed at the corner portion, there is no separate fixing nail portion, and there is also a portion that can have a certain distance from the wall surface There is a problem in that the post-installation of the overhead column is unstable and the wall surface is rough and rugged, which is not suitable for finishing a concrete building requiring a space for leveling.

The present invention also includes a first vertical plate, a second vertical plate, and a horizontally extending plate extending to one side of the gravel board, the corner beads being used in concrete structures, A technique relating to a corner finishing part constituted by a plurality of corners is disclosed in Patent Publication No. 10-1136574.

Japanese Patent Application Laid-Open No. 10-1136574 discloses a technique of forming a stud-like finish on a corner of a concrete structure by fixing the corner finishing portion to a separate fixing plate by a fixing nail at the corner finishing of the concrete building Respectively.

However, the above-mentioned Japanese Patent Application No. 10-1136574 has a problem that the installation method is limited because the corner finishing portion can be installed only in a stud-type installation method.

In addition, since a fixing plate must be separately provided in the installation, and the gypsum board can be installed after the corner finishing part is fixed to the fixing plate through the fixing nail, the construction process is complicated. The gypsum board must be inserted into the first and second vertical plates and the horizontal plate and the fixing plate included in the gypsum board. Therefore, if there is a slight error in the corner finish, There is a problem that a gap can be formed after the insertion of the plug, resulting in an unstable structure.

In addition to the above-mentioned JP-A-10-1136574, various corner bead technologies are known. However, since the utilization of the corner beads is lowered at the actual construction site, the corner corner portion of the building is being constructed by the molding process rather than the corner bead For this reason, it can be installed in various forms such as a house bond type including a stud type, high utilization efficiency regardless of the shape of a building, such as concrete and assembly, for finishing a corner portion of a building, A corner bead for a gypsum board is required which can be easily finished by taking a simple method in construction.

Patent Registration No. 10-1136574 (Apr. 18, 2012) Registered Utility Model Study No. 20-0399628 (October 27, 2005) Japanese Patent Application Laid-Open No. 2010-265673 (November 25, 2010) Registration Utility Model No. 20-0182663 (Mar. 3, 2000)

Accordingly, it is an object of the present invention to solve the above-mentioned problems of the prior art. Accordingly, it is an object of the present invention to provide a concrete structure construction method, The present invention provides a corner bead for a gypsum board which is stable and has a reduced workability and improved workability.

According to an aspect of the present invention, there is provided a corner bead for a gypsum board for installing a gypsum board in a concrete structure, comprising: a body having a hollow portion; first and second vertical plates protruding from both sides of the x- And a third and fourth vertical plates protruding from both sides of the y-axis surface of the third and fourth vertical plates, wherein the first and second vertical plates and the inner side of the third and fourth vertical plates include corner pillars To provide a gypsum board type corner bead.

At this time, the corner post is connected to the first joining member, one end of which is in contact with the first gypsum board of the gypsum board, and the other end of which is fitted in the y-axis direction, The gypsum board may further include a second joining member contacting two gypsum boards. In the concrete gypsum board, the gypsum board may be installed without limitation of the stud type and the bond bond type. In addition, And the structural stability and dimensional accuracy of the corner portion can be improved.

Therefore, by using the corner beads for a gypsum board proposed in the present invention, it is possible to finish the corners of the building with precise dimensions irrespective of the method of the structure and the process type at the time of construction, It is possible to significantly reduce the processing time and manpower.

FIG. 1 is a top view showing a corner portion of a building closed by a conventional molding operation.
FIG. 2 is a top view showing a corner portion of a concrete building closed through a corner bead for a gypsum board according to an embodiment of the present invention. FIG.
3 is a top view showing a corner bead for a stud-type gypsum board according to another embodiment of the present invention.
FIG. 4 is a top view showing an out-corner closed through a corner bead for a stud-type gypsum board according to another embodiment of the present invention.
FIG. 5 is a top view showing the finish of an incinerator of a concrete structure through a corner bead for a stud-type gypsum board according to another embodiment of the present invention.
FIG. 6 is a perspective view showing that an out-corner of a concrete structure is closed through a corner bead for a stud-type gypsum board according to another embodiment of the present invention.
FIG. 7 is a perspective view illustrating the finish of an incinerator of a concrete structure through a corner bead for a stud-type gypsum board according to another embodiment of the present invention.
8A is a top view illustrating a corner bead for a house bond type gypsum board for an outboard according to another embodiment of the present invention.
8B is a top view showing a corner bead for a house bond type gypsum board for an incinerator according to another embodiment of the present invention.
FIG. 9 is a top view showing an out-corner of a concrete building closed through a corner bead for a house-bond-type gypsum board for an outboard according to another embodiment of the present invention.
10 is a top view showing the finish of an incinerator of a concrete building through a corner bead for a house bond type gypsum board for an inciner according to another embodiment of the present invention.
11 is a perspective view showing that the out-corner of a concrete structure is closed through a corner bead for a house bond-type gypsum board for an outboard according to another embodiment of the present invention.
12 is a perspective view showing the finish of an incinerator of a concrete building through a corner bead for a house bond type gypsum board for an incinerator according to another embodiment of the present invention.
FIG. 13 is a perspective view showing three corner posts fitted through a connecting member according to an embodiment of the present invention. FIG.

The present invention is applicable to a gypsum board for effectively installing the gypsum boards 31 and 32 in closing the corner portions 41 of the concrete structure 40 (hereinafter including the out corner 41a and the inners 41b) A corner bead technique is described and the present invention can remarkably reduce the construction time and the attraction force when the corner portion of the concrete building is closed when the corner finish is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments described below are provided by way of example only so that those skilled in the art can fully understand the spirit of the present invention and the present invention is not limited to the embodiments described below But may be embodied in other forms without limitation.

In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience.

Like reference numerals designate like elements throughout the specification.

FIG. 2 is a top view illustrating closing of a corner portion 41 of a concrete building 40 through a corner bead for a gypsum board according to an embodiment of the present invention.

2, a corner bead for a gypsum board for installing a gypsum board in a concrete building, the present invention includes a body 10a having a hollow portion 10b and a bead core 10b projecting to both sides of the x- First and second vertical plates 11 and 12 and third and fourth vertical plates 13 and 14 protruding from both sides of the y-axis of the body.

As the material of the vertical plates, aluminum may be used. Specifically, aluminum 1000, 2000, 5000, 6000, 7000 series such as A1050, A2011, A2024, A5052, A6061, A6063, A7075 and the like can be used. It is preferable to use materials of the aluminum 6000 series.

In addition to the above-mentioned aluminum, a lightweight plastic material can be used. The plastic can be easily produced in a desired form by injection molding or the like, and is suitable for use instead of aluminum. As such plastic materials, polycarbonate, polypropylene, polyvinyl chloride, fiber reinforced plastics and the like may be used. In order to impart flame retardancy, a plastic material mixed with a flame retardant may be used.

The outer width between the first and second vertical plates 11 and 12 and the outer width between the third and fourth vertical plates 13 and 14 are W1 and the width of the end portions of the gyro boards 31 and 32 2, the corner post 10 of the present invention is positioned between the second and third vertical plates 12 and 13 so that the width W2 is equal to or slightly different from W1 and W2, The first and second gypsum boards 31 and 32 closing the corner portion 41 are brought into contact with the corner portions 41 of the concrete building 40 through the outer side surfaces of the first and second vertical plates 41 and 42, It is possible to abut the third and fourth vertical plates 13 and 14 so as to simplify the closing process of the corner portion 41 than the corner bead in which the conventional molding operation or the fitting portion is formed There is an advantage that it can be.

In the present invention, the corner post 10 is in close contact with the out-corner 41a of the corner portion 41 of the concrete building 40. In the present invention, It can be brought into close contact with the inners 41b of the corner portions 41 of the concrete building 40 through the first and fourth vertical plates 11 and 14 in addition to the first and second plates 12 and 13.

The description thereof will be omitted because it can be easily deduced through the stud-type finishing process described below.

Meanwhile, in the actual finishing process of the concrete building 40 in which the wall is not leveled and the surface is uneven, a stud type and a house bond type are used. To this end, the present invention uses a separate joining member (21) and (22).

The joining members 21 and 22 are divided into a first joining member 21 and a second joining member 22. The other end of the first joining member 31 is fitted to the x- (11) (12) of the first and second vertical plates (11, 12).

At this time, at least one pair of fixing protrusions 15 opposed to each other are formed inside the first and second vertical plates 11 and 12, and the first joining member 21 fitted to the corner post 10 ).

The second joining member 22 is also connected to the third and fourth vertical plates 13 and 14 via at least one pair of fixing protrusions 15 which are opposed to each other inside the third and fourth vertical plates 13 and 14. [ (14).

The first and second bonding members 21 and 22 may be made of various materials such as wood and resin. However, it is preferable that the first and second bonding members 21 and 22 are low-cost MDF (Medium Density Fiberboard) Most preferably, the density is 650 to 750 kg / m3.

It is also possible to use a wood, a resin, particularly a soft resin having the same physical properties as those of the MDF. The soft resin may be a polyethylene resin, an epoxy resin, an acrylic resin, or a copolymer thereof. However, the soft resin is not limited thereto, and any resin having a density, a peel strength, and a flexural strength similar to those of the MDF used in the present invention Can be used. When the soft resin is molded, an additive such as a flame retardant may be added to give flame retardancy.

The following table is a physical characteristic table according to the density (kg / m 3) of the MDF.

characteristic unit shame density kg / m3 600 650 700 750 800 850 Moisture content % 7 ± 2 7 ± 2 7 ± 2 7 ± 2 7 ± 2 7 ± 2 Expansion ratio % 9 10 10 13 19 25 Width tolerance mm / m ± 0.5 ± 0.4 ± 0.4 ± 0.4 ± 0.2 ± 0.2 Peel strength N / mm < 2 & 0.4 0.7 0.7 0.7 0.8 0.8 Flexural strength N / mm < 2 & 2000 3000 3000 3000 3000 3000

Referring to Table 1, it can be seen that as the density of the MDF exceeds 750 kg / m 3, the peeling strength and the bending strength are not greatly increased, but the expansion ratio is increased and the width tolerance is greatly reduced due to the increase of the density .

As a result, it can be seen that when the amount exceeds 750 kg / m 3, the dimensional accuracy of the construction decreases.

In addition, at a density of less than 650 kg / m 3, peeling strength and bending strength are remarkably reduced. As a result, due to the dimensional accuracy and strength, MDF material suitable for finishing process has a density of 650 to 750 kg / .

The distance between the fixing protrusions 15 for fixing the first and second bonding members 21 and 22 is determined by the fixing force of the first and second bonding members 21 and 22, To determine the bending strength of the narrowing neck portion (W3 portion in Fig. 3) of the members 21 and 22.

In Table 2, the interval between the fixing protrusions 15 is W3, and the inner widths of the first and second vertical plates 11 and 12 and the fourth and fourth vertical plates 13 and 14 are W4 , The results of evaluating the fixing force and the bending strength of the first and second bonding members 21 and 22 according to the values of W3 / W4.

At this time, the density of the bonding members 21 and 22 to which the W4 is fitted is fixed to 695 to 705 kg / m3, the sectional area W4 × L to 75.5 mm2 (W4: 7.55 mm, L: (In this case, L is the length of the joint member 21 or 22), and the force of MPa was compared with the cross-sectional area, and the fixation force and the bending strength were measured.

At this time, the fixed bonding force was measured by pulling the fixed bonding members 21 and 22 in the vertical direction, and the bending strength was measured in the horizontal direction.

shame W3 / W4 0.60 0.65 0.70 0.75 0.80 0.85 Fixed bond strength
(MPa) 1.2 1.1 One 0.9 0.6 0.4 Bending strength
(MPa) 15 20 30 30 32 35

Referring to Table 2, it can be seen that when the value of W3 / W4 is 0.65 or less, the fixed bonding force is increased but the bending strength is reduced by 30% or more and it can be easily broken. Also, when the value of W3 / W4 is 0.80 or more It can be confirmed that the bending strength is increased but the fixing force is reduced by 30% or more, so that the bonding members 21 and 22 can easily escape according to the pulling.

It can be seen that the first and second bonding members 21 and 22 are most preferably fit into the gap between the pair of the fixing protrusions 15 having W3 / W4 of 0.70 to 0.75.

When the corner beads for the gypsum board are installed in the corner portion 41 of the concrete structure 40 in the form of a stud, the corner pillar 10 passes through the second and third vertical plates 12 and 13, Or the first and fourth vertical plates (11) and (14).

3, when the corner post 10 of the present invention is installed in the outcorner 41a of the concrete structure 40, the one corner of the studs 41a of the outcorner 41a of the concrete building 40, The second and third vertical plates 12 and 13 are disposed in contact with the first and second connecting members 50 and 50. The adjacent corner columns 10 are fixed to the first and second connecting members 21 and 22, (51) is embedded, whereby the stud (50) is indirectly joined to the stud (50).

4, when the corner post 10 of the present invention is installed in the incinerator 41b of the concrete structure 40, the corner post 10 of the present invention has two studs adjacent to the corner of the incinerator 41b of the concrete structure 40, The first and fourth vertical plates 11 and 14 are provided in contact with the first and second connecting members 50 and 50. The adjacent corner columns 10 are fixed to the first and second connecting members 21 and 22, The nail 51 is embedded so that the stud 50 is indirectly joined to the stud 50.

Since the materials of the first and second bonding members 21 and 22 are made of MDF material having a density of 650 to 750 kg / m.sup.3, through the tackers F30 and 630 commonly used in the stud-type finishing process, The fixing nails 51 penetrate through the first and second bonding members 21 and 22 so that the first and second bonding members 21 and 22 and the stud 50 are formed into a shape shown in FIGS. Can be combined. That is, the time for the finishing process in the out-corner 41a and the incorporator 41b is shortened through the first and second bonding members 21 and 22 fitted to the fixed column 10, There is an advantage that the structure after the process can be stable.

In the stud type finishing step, the fixing nails 51 are stuck to the first and second bonding members 21 and 22 so that the first and second bonding members 21 and 22 are contracted The widths of the end faces of the first and second gypsum boards 31 and 32 are denoted by W2 and the widths of the first and second gluing members 21 and 22 are denoted by W2, The fixing nail 51 is inserted into the first and second bonding members 21 and 22 so that W5 / W2 is 1.05 to 1.1, It is preferable that the widths W2 and W5 of the boards 31 and 32 are not spaced apart when the end surfaces thereof contact the one end surfaces of the first and second joint members.

6 and 7, according to another embodiment of the present invention, it can be confirmed that the outcorner 41a and the incorporator 41b of the concrete structure 40 are finished in a stud shape.

6 and 7, a corner post 10 according to the present invention includes first and second joining members (a first and a second joining members) having a plurality of fixing nails 51 fitted to the corner posts 10 after being in contact with the stud 50 And the end surfaces of the first and second gypsum boards 31 and 32 are brought into contact with the one end surface of the first and second joint members 21 and 22 to form the outcorner 41a, , It can be confirmed that the inners 41b are closed.

The present invention also provides a corner bead for a gypsum board for finishing the outcorner 41a and the inners 41b of the concrete building 40 in the form of a house bond in another embodiment.

At this time, at the end of the out corner 41a, as shown in Fig. And an extension member 16 having one side integrally coupled to the outer side of the second and third vertical plates 12 and 13 and a plurality of spaced apart projections 17 formed outwardly.

When the corner post 10 is installed on the outcorner 41a of the concrete structure 40 through the above-described structure, the plurality of spaced apart projections 12, 13 instead of the second and third vertical plates 12, Can be brought into contact with the outcorner (41a) of the concrete building (40) through the opening (17).

Thus, as shown in FIG. 9, the house bond 60 is located in the spaced apart space through the spacing protrusion 17, and the fixed column 10 can be joined to the out-corner 41a.

At this time, it is preferable that the corner pillar 10 is provided with the surface projection 18 between the spacing protrusions 17 so that the corner pillar 10 can be better joined by the bond bond 60 Do.

9, the first and second gypsum boards 31 and 32 are disposed on the inner side of the extension member 16 extending to the outside of the second and third vertical plates 12 and 13, And the inner side of the extension member 16 is spaced apart from the concrete structure 40 through the spacing protrusion 17. Thus, the first and second connecting members 21, The first and second gypsum boards 31 and 32 are also spaced apart and the house bond 60 is located in the spaced space so that the first and second gypsum boards 31 and 32 are spaced apart from the concrete building 40 .

Since the first and second gypsum boards 31 and 32 are guided by the extension member 16 when the inside of the extension member 16 is horizontally aligned, (41a) can be closed.

In the finishing of the inners 41b, as shown in Fig. 8B. The first and fourth vertical plates 11 and 14 may further include an extension member 16 having one side integrally coupled to the outer side surface and a plurality of spaced apart projections 17 formed outwardly.

When the corner post 10 is installed on the inners 41b of the concrete structure 40 through the above structure, the plurality of spaced apart projections 11, 14 instead of the first and fourth vertical plates 11, 17 to be spaced apart from the incinerator 41b of the concrete building 40. As shown in FIG.

Referring to FIG. 10, the house bond 60 is located in the spaced apart space through the spacing protrusions 17, and the fixed column 10 can be bonded to the inners 41b.

At this time, the corner post 10 is provided with the spacing protrusion 17 so that the corner post 10 can be more easily joined by the bond bond 60, as in the case of finishing the out corner 41a. It is preferable that the surface projection 18 is provided between the outer circumferential surface and the outer circumferential surface.

10, the first and second gypsum boards 31 and 32 are guided inwardly of an extension member 16 extending outside the first and fourth vertical plates 11 and 14, , And abuts on one end surface of the two joining members (21) and (22).

Since the first and second gypsum boards 31 and 32 are spaced apart by the spacing protrusion 17 and are guided by the extension member 16 during the finishing process of the out corner 41b, , It is possible to close the out-corner 41b in a state in which the horizontal position is ensured while easily securing the spacing space.

11 and 12, the corner post 10 abuts against the concrete structure 40 through the spacing protrusion 17 and the bond bond 60 in the outcorner 41a and the inserter 41b, It can be confirmed that the first and second gypsum boards 31 and 32 are easily guided through the inside of the extension member 16.

The present invention may further include a connecting member having two or three protrusions 71 so that a plurality of corner posts 10 can be easily installed at apexes where the corner portions 41 of the concrete structure 40 are gathered. 70).

13, the connecting member 70 of the present invention has three or less protrusions 71 whose protrusions 71 are orthogonal and the size of the protrusions 71 is smaller than that of the corner posts 10 So that the connecting member 70 and the plurality of corner posts 10 can be easily engaged with each other through the hollow portion 10b and the protrusion 71. [ In addition, since the plurality of corner posts 10 must be in contact with each other and closely contacted, it is preferable to cut the ends obliquely at an angle of 45 degrees and to cut them so that they do not touch each other.

At this time, the connecting member 70 must receive a load of a plurality of corner posts 10 at the vertex of the concrete structure 70 at the same time. Therefore, the connecting member 70 must satisfy a certain level of strength, It is preferable to use flexible polyethylene, polypropylene, polyimide, PET, polycarbonate resin or a polymer thereof.

10: Corner column
10a: Body 10b: Hollow portion
11: first vertical plate 12: second vertical plate 13: third vertical plate 14: fourth vertical plate
15: fixing projection 16: extension member 17: spacing projection 18: surface projection
21: first joining member 22: second joining member
31: first gypsum board 32: second gypsum board
40: Concrete building 41: Corner part
41a: out corner 42b: inconer
50: Stud 51: Fixed nail 60: House bond
70: connecting member 71:
80: joint tape 81: compound paint 82: molding 90: air gap

Claims

In a corner bead for a gypsum board for installing a gypsum board in a concrete structure
A body having a hollow portion;
First and second vertical plates protruding from both sides of the x-axis surface of the body;
And a third and fourth vertical plates protruding from both sides of the y-axis surface of the body,
Wherein at least one pair of fixing protrusions facing each other is formed inside the first and second vertical plates,
And a corner post on which a pair of opposing fixing protrusions are formed on the inner side of the third and fourth vertical plates,
The corner post is in contact with the stud via a second, third, or fourth,
A first joining member whose one end is in contact with the first gypsum board of the gypsum board and the other end of the corner post is fitted in the x-axis direction of the corner post; And
Wherein the corner bead further comprises a second joint member having one end joined to the second gypsum board at one end thereof in the y-axis direction of the corner post, and the other end being in contact with the second gypsum board of the gypsum board.

In a corner bead for a gypsum board for installing a gypsum board in a concrete structure
A body having a hollow portion;
First and second vertical plates protruding from both sides of the x-axis surface of the body;
And a third and fourth vertical plates protruding from both sides of the y-axis surface of the body,
Wherein at least one pair of fixing protrusions facing each other is formed inside the first and second vertical plates,
And a corner post on which a pair of opposing fixing protrusions are formed on the inner side of the third and fourth vertical plates,
Wherein the corner post is in contact with the outboard corner of the concrete structure through the second and third vertical plates and in contact with the incinerator of the concrete building through the first and fourth vertical plates,
A first joining member whose one end is in contact with the first gypsum board of the gypsum board and the other end of the corner post is fitted in the x-axis direction of the corner post; And
Wherein the corner bead further comprises a second joint member having one end thereof fitted in the y-axis direction of the corner post and the other end being in contact with a second gypsum board of the gypsum board.

3. The method according to claim 1 or 2,
W3 / W4 is 0.70 to 0.75, where W3 is the inner width between the pair of fixing projections, and W4 is the inner width between the first and second vertical plates and between the third and fourth vertical plates. Corner beads for gypsum board.

delete

3. The method according to claim 1 or 2,
Wherein the first and second joint members are made of MDF or a soft resin and have a density of 650 to 750 kg / m 3.

3. The method according to claim 1 or 2,
The width of the end face of the gypsum board is W2,
And a width of one end face of the first and second joining members is W5,
And W5 / W2 is 1.05 to 1.1.

3. The method according to claim 1 or 2,
Wherein the first and second joining members are joined to the studs by a plurality of fixing nails.

3. The method of claim 2,
Further comprising an extension member integrally coupled to the outer side of the second and third vertical plates and having a plurality of spaced apart projections in the outer direction, wherein when the corner post is installed in the out corner of the concrete structure, Wherein the corner beads are spaced apart from the outboard corners of the concrete structure through the plurality of spaced apart projections in place of the second and third vertical plates.

3. The method of claim 2,
The first and fourth vertical plates may further include an extension member integrally coupled to the outer side of the first and fourth vertical plates and having a plurality of spaced apart projections formed in the outer direction. When the corner post is installed in the incinerator of the concrete structure, Wherein the corner beads are spaced apart from the outboard corners of the concrete structure through the plurality of spaced apart projections in place of the first and fourth straight plates.

3. The method according to claim 1 or 2,
And a corner bead for a gypsum board having improved workability, characterized in that it comprises two or three protrusions which can be fitted to correspond to the size of the hollow portion, wherein each of the two or three protrusions further comprises orthogonal connecting members. .