KR101615724B1 - Assemabled single panel overlapping type for roof construction - Google Patents

Abstract

In the present invention, when a plurality of roof single panels are successively assembled on a roof structure, the fastening bolts for fixing the single panel to the roof structure are not exposed to the outside, thereby preventing rainwater from penetrating through the fastening portions of the fastening bolts The present invention relates to a roof type single panel assembly for roof installation, which prevents condensation through a fastening bolt due to a temperature difference between inside and outside of a roof,
A cover plate provided at the center of the surface plate and including a first inclined surface, a first inclined surface, a second inclined surface, a first upper surface, a third inclined surface, a second inclined surface, and a fourth inclined surface; A lower cover plate provided on one side of the cover plate and including a fifth inclined surface, a third inclined surface, a sixth inclined surface, a second upper surface, a seventh inclined surface, and a fourth inclined surface; An upper cover plate provided on the other side of the cover plate and having a fifth step surface, an eighth surface, a third upper surface, a ninth inclined surface, a sixth step surface, and a tenth inclined surface; A seventh stage inclined surface, an eleventh inclined surface, a fourth upper surface, a twelfth inclined surface, and an eighth inclined surface.

Description

[0001] ASSEMBLED SINGLE PANEL OVERLAPPING TYPE FOR ROOF CONSTRUCTION [0002]

More particularly, the present invention relates to a single-panel type single panel assembly for roof mounting, and more particularly, to a single panel assembly for multiple roofs, in which a fastening bolt for fixing a single panel to a roof structure is exposed to the outside So as to prevent rainwater from penetrating through the fastening portion of the fastening bolt, and to prevent condensation through the fastening bolt due to a difference in the inside and outside temperature of the roof.

Generally, a single panel for a roof is a steel plate material made in a specific panel shape and is mainly used as a material for a prefabricated building.

In addition, the single panel for roof has a substantially rectangular plate shape, and the edge portions thereof form a coupling portion so as to be connected to other neighboring roof single panels continuously.

The single panel for roof is not only lightweight but also has durability of its own strength compared to other materials. It is easy to work such as installation and demolition, and has the advantage of reducing construction time and construction cost compared to other construction structures It is true.

As described in Korean Patent Registration No. 10-1322690 (hereinafter referred to as " prior art "), prior to the application of such a roof single panel, Sandwich panels filled with plates and a packing of a heat insulating material have been widely used.

According to the prior art described above, as shown in Fig. 1, the head portion of the fastening bolt for fixing the top surface of the roof is not exposed on the surface of the roof, so that rainwater or the like penetrates into the roof through the portion where the fastening bolt is installed .

However, in the prior art, the fastening bolts for securing the sandwich panel are in close contact with the outside of the upper part of the roof, and the lower part of the fastening bolt is in the lower inside part of the roof To the structure to be installed in the existing structure.

In other words, although the fastening bolt is generally made of a metal having a high thermal conductivity and is not directly affected by the temperature of the outside air, its head is in contact with the surface plate, The resulting region also has the temperature of the outside air.

The thermal conductivity of these fastening bolts is expanded around the roof structure where the fastening bolts are tightened, and these parts cause condensation depending on the temperature difference between the outside air and the inside air.

The above-mentioned condensation phenomenon not only corrodes not only the fastening boat but also the roof structure in the fastening relation with the fastening boat, but also causes a problem of detaching the sandwich panel from the roof structure due to weakening of the fastening bolt when it is further enlarged. do.

Furthermore, it is natural that the possibility of corrosion is very high due to the tightening relationship with the fastening bolt, including the process of forming the fastening hole formed in the roof structure so as to be fastened to the fastening bolt.

The inventor of the present application filed a patent application through Korean Patent Application No. 10-2013-0053836 (filed on March 13, 2013) in connection with the prior art described above, but since the above problems are inherent, The present invention has been developed.

Korean Registered Patent No. 10-1322690 (October 30, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a single roof panel for a roof, which has a structure in which a bolt is not exposed to the surface of the roof panel, Shaped single panel assembly for preventing roof penetration through the bolt and preventing rainwater from penetrating through the bolt.

According to an aspect of the present invention, there is provided a single-panel type single panel assembly for roof mounting, including: a surface plate having one or more cover plates extending in the longitudinal direction and having a curved shape protruding upward in the width direction; And a filler material having a heat insulating property at a lower portion thereof, the sandwich panel assembly for roof installation comprising a composite body,

A cover plate provided at the center of the surface plate and including a first inclined surface, a first inclined surface, a second inclined surface, a first upper surface, a third inclined surface, a second inclined surface, and a fourth inclined surface;

A lower cover plate provided on one side of the cover plate and including a fifth inclined surface, a third inclined surface, a sixth inclined surface, a second upper surface, a seventh inclined surface, and a fourth inclined surface;

An upper cover plate provided on the other side of the cover plate and having a fifth step surface, an eighth surface, a third upper surface, a ninth inclined surface, a sixth step surface, and a tenth inclined surface;

A seventh stage inclined surface, an eleventh inclined surface, a fourth upper surface, a twelfth inclined surface, and an eighth inclined surface.

The cover plate is made of a thin steel plate and protrudes upward at the center of the surface plate. The cover plate has a first inclined surface formed by bending the front end of the surface plate upward;

A first stepped surface formed by being bent from the tip end of the first inclined surface in the other direction;

A second inclined surface formed by bending at the same angle as the first inclined surface from the tip end of the first stepped surface to the upper portion in one direction;

A first upper surface formed by bending one end of the second inclined surface in a horizontal direction;

A third inclined surface formed by bending the lower end of the first upper surface in one direction;

A second stepped surface formed by bending the tip end of the third inclined surface in the other direction;

And a fourth inclined surface formed by bending at the same angle as the third inclined surface at the tip end of the second stepped surface.

And the lower cover plate includes a fifth inclined surface formed by bending the end portion of the surface plate upwardly;

A third stepped surface formed by being bent from the tip end of the fifth inclined surface in the other direction;

A sixth inclined surface formed by bending at the same angle as the fifth inclined surface from the tip of the third stage guiding surface to the upper portion in one direction;

A second upper surface formed by bending one end of the sixth inclined surface in a horizontal direction;

A seventh inclined surface formed by bending the tip of the second upper surface in a lower direction in one direction;

And a fourth stepped surface formed by bending the tip end of the seventh inclined surface in the other direction.

And the upper cover plate is closely fixed to the lower surface of the third lower surface of the lower cover plate;

An eighth inclined surface which is tightly fixed to the top of the sixth inclined surface;

A third upper surface tightly fixed to an upper portion of the second upper surface;

A ninth inclined surface which is tightly fixed to an upper portion of the seventh inclined surface;

A sixth stepped surface which is tightly fixed to the lower portion of the fourth stepped surface;

And a tenth tilted surface formed by bending the tip of the sixth tilted surface in the lower direction in one direction.

The insert-type heat insulating structure includes a seventh step surface on which the upper surface of the third step surface of the lower cover plate is closely fixed to the lower portion, an eleventh sloped surface on which the inner surface of the sixth inclined surface is closely fixed to the upper surface, And a fourth inclined surface in which an inner side of the seventh inclined surface is closely fixed to the upper portion and an eighth inclined surface in which an upper portion of the fourth stage surface is closely fixed to the lower portion, Wow;

A lowering and lowering member into which the landing and thermal insulating material is inserted and fixed;

It is preferable to constitute a fixed bed thermal insulation material capable of preventing the occurrence of condensation due to thermal bridge phenomenon.

The recessed grooves are formed on both sides of the lower portion of the plastic insert heat insulator structure extruded so as to be in close contact with the lower portion of the lower cover plate. After forming the hook portions on the tight hammers, they are pushed into the hook portions and fastened. And the tight femur is fixed to a sandwich panel installed at the lower part or is fastened to the roof structure using a long direct bolt.

The fastening structure having a heat insulation performance made to be bent in a shape to be wrapped in correspondence with a side surface shape of the lower cover plate is directly fastened to the lower sandwich panel using a direct bolt or directly fixed to the roof structure using a long direct bolt .

The fastening structure is a bolt-fastening structure in which an aluminum insulating bar having a heat insulating property is bolted to a stainless steel bent-formed body having high strength and high elasticity, which is formed in a bent shape to be wrapped around the lower cover plate, And fastening it to the roof structure by using a long direct coupling bolt.

And the fastening structure is coupled in the width direction in the width direction from the factory to the tight fold for the lower support.

It is also possible to join the lower extruded molded body with the extruded plastic body having strength and heat insulation which are formed to be bent in a shape to be wrapped in correspondence with the inner surface shape of the lower lid plate and to fasten the lower sandwich panel using the direct bolt bolt or use the long direct bolt And directly fixed to the roof structure.

According to the invention, a single-panel type single-panel assembly for roof installation is constructed such that single panels for roof installation are fixed by bolts on a frame constituting a roof structure, and bolts, washers, caps and the like are not exposed on the outer surface of the roof, And both sides of the protruding portion are shaded by the formation of the stepped surface, thereby sharpening the outline of the protruding portion.

Particularly, there is an effect that the bolt is not exposed to the outside of the roof, the possibility of penetration of the rainwater is eliminated, and the penetration of the rainwater through the fastening portion of the bolt is completely blocked.

Further, according to the shape of the projecting portion, the end portion of the curved portion of the load-fixing-type heat-insulating structural body is fixed by gripping and holding the end portion of the curved portion. In addition, So that there is a stable effect against lifting or widening.

In addition, it is possible to completely prevent condensation, for example, by using an aluminum heat insulating bar as a heat insulating structure at the bottom of the roof connecting plate and at the bottom of the upper plate, or by using a rectangular heat insulating plastic as a heat insulating structure.

In addition, since the shape of the projecting portion forms the projection on the upper side, the bending strength of the steel plate is increased, and a realistic three-dimensional effect is produced, and an effect of producing aesthetic feeling on the roof can be obtained.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional view for explaining an assembling relationship of a roof mounting panel according to the prior art; FIG.
2 and 3 are views showing a cover plate according to the present invention.
FIG. 4 is a perspective view showing a fast thermal insulator according to the present invention. FIG.
FIG. 5 is a front view showing an assembly state of a garage type single panel assembly for roof installation on a garment-type heat insulating structure according to the present invention.
Fig. 7 is a view showing a hermetic type heat insulating structure of another example according to the present invention.
FIG. 8 is a view showing the structure of the tightframe according to FIG. 7. FIG.
9 is a view showing an assembled state of a fast heat insulating structure according to another example of the present invention.
10 is a cross-sectional view illustrating a cover plate according to various examples of the present invention.
11 and 12 are views for explaining an example of construction of a panel.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, but the inventor may appropriately define the concept of the term to describe its invention in the best way Can be interpreted as meaning and concept consistent with the technical idea of the present invention.

It should be noted that the embodiments described in this specification and the configurations shown in the drawings are merely preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It should be understood that various equivalents and modifications may be present.

In describing the present invention, the right side of the cover plate will be referred to as one side and the left side will be referred to as the other side with respect to the cover plate as one side and the other side.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a perspective view of a heat insulating structure according to the present invention, and FIG. 5 is a cross-sectional view of a heat insulating structure according to the present invention, 7 is a view showing a structure of a heat insulating structure according to another example of the present invention, FIG. 8 is a view showing a structure of a tight hull according to FIG. 7, and FIG. 9 is a cross- 10 is a cross-sectional view illustrating a cover plate according to various examples of the present invention. FIGS. 11 and 12 illustrate examples of construction of a panel. FIG. FIG.

[Example 1]

First, as shown in FIGS. 2 to 5, a single panel assembly for a roof installation according to a first embodiment of the present invention includes: a surface plate 30 that is seated and fixed on an upper portion of a sand panel; A first inclined surface 42, a second inclined surface 43, a first upper surface 44, a third inclined surface 45, and a third inclined surface 45. The first inclined surface 41, the first inclined surface 42, A cover plate 40 composed of a second step surface 46 and a fourth inclined surface 47; A third inclined surface 52, a sixth inclined surface 53, a second upper surface 54, a seventh inclined surface 55, and a sixth inclined surface 55. The fifth inclined surface 51, the third inclined surface 52, A lower cover plate 50 having a fourth step surface 56; And is provided on the other side of the cover plate 40 and has a fifth step surface 61, an eighth inclined surface 62, a third upper surface 63, a ninth inclined surface 64, 65), and a tenth inclined surface (66); And a seventh step surface 71-1, an eleventh inclined surface 71-2, a fourth upper surface 71-3, a twelfth inclined surface 71-4, and an eighth step surface 71-5. Shaped heat insulating structure (70).

The surface plate 30 constituting the present invention is fixed to the upper portion of the sand panel 80 and has a center portion where the cover plate 40 protrudes upward and the first inclined surface 41 of the cover plate 40 And the fourth inclined surface 47 are formed by extending the surface plates 31 and 32, respectively.

A lower lid plate 50 and an upper lid plate 60 are provided at the ends of the surface plates 31 and 32, respectively.

The cover plate 40 is made of a thin steel plate material and has a shape protruding upward at the center of the surface plate 30. The cover plate 40 has a first inclined surface 41 formed by bending the tip of the surface plate 32 upward, A first step surface 42 formed by bending the first inclined surface 41 in the other direction continuously from the front end of the first inclined surface 41 and a first inclined surface 41 extending upward from the tip end of the first end surface 42 in one direction, A first upper surface 44 formed by bending one end of the second inclined surface 43 in the horizontal direction and a second upper surface 44 formed by bending the second inclined surface 43 at the same angle, A second end surface 46 formed by bending the tip end of the third inclined surface 45 in the other direction and a second end surface 46 formed by bending the second end surface 46 And a fourth inclined surface 47 formed by bending at the same angle as the third inclined surface 45 at the tip end of the third inclined surface 45.

The lower cover plate 50 includes a fifth inclined surface 51 formed by bending the end portion of the surface plate 31 upwardly and a third inclined surface 51 formed by bending the other end of the fifth inclined surface 51 in the other direction A sixth inclined surface 53 formed by bending at the same angle as the fifth inclined surface on the upper side in the one direction from the tip end of the third stepped surface 52 and a sixth inclined surface 53 bent from the tip of the sixth inclined surface 53 at one side A seventh inclined surface 55 formed by bending the lower portion of the second upper surface 54 in the lower direction of one side thereof from the front end of the second upper surface 54, And a fourth step surface 56 formed by folding in the other direction.

The upper cover plate 60 has a fifth step surface 61 which is closely fixed to the lower surface of the third step surface 52 of the lower cover plate 50 and a fifth step surface 61 which is in close contact with the upper surface of the sixth inclined surface 53 A third upper surface 63 tightly fixed to the upper portion of the second upper surface 54, a ninth inclined surface 64 closely fixed to the upper portion of the seventh inclined surface 55, And a tenth inclined surface 66 which is formed by bending the lower end of the sixth step surface 65 in the lower direction.

The upper end surface of the third end surface 52 formed on the lower cover plate 50 is closely adhered to the lower end of the upper end surface 71-1 and the sixth end surface 71-1, An eleventh inclined surface 71-2 in which an inner surface of the first upper surface 54 is closely fixed to the upper portion and a fourth upper surface 71-3 in which the lower portion of the second upper surface 54 is closely fixed to the upper portion, And an eighth stepped surface 71-5 formed by an upper surface of the fourth stepped surface 56 closely fixed to the lower surface thereof, (71), and a lowering and lowering member (73) into which the landing thermal insulating material (75) is inserted and fixed.

The extended piece 73-1 formed by extending the lowering member 73 of the fixed heat insulating structure 70 is fixed to the sand panel 80 using a direct bolt to the sand panel 80, It can be fastened directly to the roof structure (Purlin) using bolts.

At this time, it is preferable that the adhering type heat insulating structure 70 is made of an adiabatic bar having excellent heat insulating performance so as to prevent the occurrence of condensation due to heat bridging.

A fifth stepped surface 61 (corresponding to the third stepped surface 52 and the fourth stepped surface 56, respectively) of the lower cover plate 50 when fastening the lower cover plate 50 to the adhered heat- And the sixth inclined surface 53 and the seventh inclined surface 55 which are adjacent to the sixth inclined surface 65 and the sixth inclined surface 65, respectively.

The corresponding portions of the fifth and sixth stepped surfaces 61 and 65 of the upper cover plate 60 are elastically pinched by being positioned below the third and fourth stepped surfaces 52 and 56, And the upper surfaces of the sixth inclined surface 53, the second upper surface 54 and the seventh inclined surface 55 are grasped, so that two neighboring roof-mounting single panels are joined.

The engaging relationship is such that the fifth inclined surface 61 corresponding to the third inclined surface 52 extends over the third inclined surface 52 while the ninth inclined surface 64 and the third upper surface 63 And the ninth inclined surface 64 and the sixth inclined surface 65 are rotated to be engaged with each other.

The number of the lids 40 may be one on each side of the front plate 30 or one on each side of the front plate 30, The plates 50 and 60 may be formed at regular intervals with respect to the width direction.

In the meantime, the lower part of the single panel assembly for roof installation of the present invention may be a deck-shaped sandwich panel having a flat upper surface, or a protruding part like a conventional roof sandwich panel.

Hereinafter, the installation procedure of the sandwich panel assembly will be described in detail.

As shown in Fig. 5, the fixing heat insulation structure 70 is fixed to the upper part of the sandwich panel 80 by using a direct bolt, or is fastened to the roof structure using a long direct bolt.

The lower cover plate 50 of the sandwich panel assembly for roof installation is then fastened to the upper part of the fixed insulation structure 70. The lower cover plate 50 is fixed to the lower surface of the seventh stepped surface 71-1 formed on the fixed insulation structure 70, The upper surface of the third stepped surface 52 formed on the cover plate 50 is brought into close contact with the lower surface of the lower cover plate 50 on the outer surface of the eleventh inclined surface 71-2 formed on the adhered thermal insulating structure 70, The upper surface of the fourth upper surface 71-3 formed on the adhered heat insulating structure 70 is formed with a second upper surface 54 formed on the lower cover plate 50 so that the inner surface of the formed sixth inclined surface 53 is closely contacted The inner surface of the seventh inclined surface 55 formed on the lower cover plate 50 is brought into close contact with the outer surface of the twelfth inclined surface 71-4 formed on the adhered heat insulating structure 70, The upper surface of the fourth stepped surface 56 formed on the lower cover plate 50 is tightly attached to the lower surface of the eighth stepped surface 71-5 formed on the adhered thermal insulating structure 70. [

The upper surface of the fifth stepped surface 61 formed on the upper cover plate 50 is brought into close contact with the lower surface of the third stepped surface 52 of the lower cover plate 50, The outer surface of the third upper surface 63 formed on the upper cover plate 50 is in close contact with the upper surface of the second upper surface 54 so that the inner surface of the eighth inclined surface 62 is in close contact with the outer surface of the second upper surface 54, The upper cover plate 50 is attached to the lower surface of the fourth stepped surface 56 so that the inner surface of the ninth inclined surface 64 formed on the upper cover plate 50 is brought into close contact with the outer surface of the seventh inclined surface 55, And the upper surface of the sixth stepped surface 65 formed in the second stepped surface 65 is tightened.

[Example 2]

7 to 9, in the sandwich panel assembly for roof installation according to the second embodiment of the present invention, the insertable insulation structure 70 made of a metallic material is directly attached to the sand panel 80 in the first embodiment, While the second embodiment uses a plastic material having heat insulation performance to adhere to the load insulator structure 70 which is capable of coping with heat insulation and expansion and contraction due to solar heat in the longitudinal direction of the roof surface plate, (70-1) is mounted on the tight hull (90), and the hanging-type heat insulating structure (70) is slidably fastened by forming a hooking hole (91).

That is, the recessed grooves 70-1 are formed on both sides of the lower portion of the plastic insert heat insulating structure 70 that is extruded so as to be adhered to the lower portion of the lower cover plate 50 of the roof surface plate, The tight fit knob 90 is fastened to the sandwich panel 80 provided at the lower portion or is fastened to the roof structure using a long direct bolt, It is possible to prevent the occurrence of condensation due to the thermal cross-linking due to the heat insulating structure 70 having the excellent adiabatic performance.
The adhered thermal insulation structure 70 includes a seventh stepped surface 70-2 in which the upper surface of the third stepped surface 52 formed on the lower cover plate 50 is closely fixed to the lower surface and the sixth inclined surface 70-2, And a fourth upper surface 70-4 in which the lower portion of the second upper surface 54 is tightly fixed to the upper portion, and a seventh inclined surface 70-3, A seventh inclined surface 70-5 and an eighth inclined surface 70-6 in which the upper portion of the fourth stepped surface 56 is closely fixed to the lower portion are integrally formed .

Further, by using the heat insulating structure 70 made of a plastic sheet, the coating surface of the roof surface plate is not damaged during the operation, and durability can be maintained.

On the other hand, it is possible to minimize the number of construction workers by merely inserting the plastic hinged insulation structure 70 in the field by producing the long hireframe (90) in the factory and expecting economical gain and high quality construction due to shortening of the air .

In addition, in order to maintain the quality of the single panel assembly for roof installation of the present invention, it is necessary to pre-assemble the fixed insulation structure on the tight tail fin 90 manufactured by the factory to minimize the dangerous work on the roof It is effective and helps in structural rigidity and precision work.

Also, it is possible to easily refurbish the roof single panel of the present invention without performing dismantling work, regardless of the roof shape and the surface material of the existing building, using the tight furring 90.

It is also possible to join the lower extruded molded body with the extruded plastic body having strength and heat insulation which are formed to be bent in a shape to be wrapped in correspondence with the inner surface shape of the lower lid plate and to fasten the lower sandwich panel using the direct bolt bolt or use the long direct bolt And can be directly fixed to the roof structure.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

30: surface plate 40: cover plate
50: lower cover plate 60: upper cover plate
70: Adhesive-type heat insulating structure 80: Sand panel
90: Tide Flemm

Claims (9)

A surface plate having one or more cover plates extending in the longitudinal direction so as to protrude upward in the width direction; And a bottom surface of the top plate, the top plate being in close contact with a bottom of the top plate,
A cover plate provided at the center of the surface plate and including a first inclined surface, a first inclined surface, a second inclined surface, a first upper surface, a third inclined surface, a second inclined surface, and a fourth inclined surface;
A lower cover plate provided on one side of the cover plate and having a fifth inclined surface, a third inclined surface, a sixth inclined surface, a second upper surface, a seventh inclined surface, and a fourth inclined surface integrally formed;
An upper cover plate provided on the other side of the cover plate and having a fifth stepped surface, an eighth inclined surface, a third upper surface, a ninth inclined surface, a sixth stepped surface, and a tenth inclined surface;
A seventh stage inclined surface, an eleventh inclined surface, a fourth upper surface, a twelfth inclined surface, and an eighth inclined surface,
A concave groove is formed on both sides of a lower portion of a plastic mounting heat insulating structure extruded so as to be in close contact with a lower portion of the lower cover plate and a hook portion is formed on a tight hull, Wherein the tight femur is fastened to a sandwich panel installed at the bottom or fastened to a roof structure using a long direct bolt.
The method according to claim 1,
The cover plate is made of a thin steel plate material and has a shape that protrudes upward at the center of the surface plate, and includes a first inclined surface formed by bending the front end of the surface plate upward;
A first stepped surface formed by being bent from the tip end of the first inclined surface in the other direction;
A second inclined surface formed by bending at the same angle as the first inclined surface from an end of the first stepped surface to an upper portion in one direction;
A first upper surface formed by bending one end of the second inclined surface in a horizontal direction;
A third inclined surface formed by bending the lower end of the first upper surface in one direction;
A second stepped surface formed by bending the tip end of the third inclined surface in the other direction;
And a fourth inclined surface bent at the same angle as the third inclined surface at the tip of the second stepped surface.
The method according to claim 1,
The lower cover plate includes a fifth inclined surface formed by bending the end portion of the surface plate upwardly;
A third stepped surface formed by being bent from the tip end of the fifth inclined surface in the other direction;
A sixth inclined surface formed by bending at the same angle as the fifth inclined surface from the tip of the third stage guiding surface to the upper portion in one direction;
A second upper surface formed by bending one end of the sixth inclined surface in a horizontal direction;
A seventh inclined surface formed by bending the tip of the second upper surface in a lower direction in one direction;
And a fourth stepped surface formed by bending the tip end of the seventh inclined surface in the other direction.
The method according to claim 1,
The upper cover plate has a fifth step surface which is fixedly attached to the lower surface of the third step surface of the lower cover plate.
An eighth inclined surface which is tightly fixed to the top of the sixth inclined surface;
A third upper surface tightly fixed to an upper portion of the second upper surface;
A ninth inclined surface which is tightly fixed to an upper portion of the seventh inclined surface;
A sixth stepped surface which is tightly fixed to the lower portion of the fourth stepped surface;
And a tenth inclined surface formed by bending the lower end of the sixth step surface in one direction.
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