KR102531739B1 - Fire door with built-in structural reinforcement frame - Google Patents

Abstract

According to an embodiment of the present invention, a fire door having a structural reinforcing frame built-in is a fire door made of first and second steel plates and a structural reinforcing frame installed between the first and second steel plates to prevent structural deformation, wherein the structural reinforcing frame is , A side frame connecting the lower frame and the upper and lower frames, and a vertical reinforcing frame coupled between the upper and lower frames, wherein fitting holes and fitting protrusions are formed in the upper and lower frames and the vertical reinforcing frames, respectively, to mutually It is characterized in that the upper and lower frames and the side frames are fastened as a direct connection piece to be combined into a steel structure without welding, and the vertical reinforcing frame and the first and second steel plates are bonded by a foamed expansion tape.

Description

Fire door with built-in structural reinforcement frame}

The present invention relates to a fire door with a built-in structural reinforcing frame, and more particularly, through a structural reinforcing frame installed between first and second steel plates and a combined structure thereof, fireproof performance and durability are enhanced, as well as production efficiency is improved. It relates to a fire door with a built-in structural reinforcement frame.

Normal fire doors are mainly used as entrance doors to general houses, apartments, factories, offices, prefabricated temporary buildings, etc. It is installed in a fire compartment divided by use, and it must meet the requirements of mechanical properties that the door should not spread fire or be deformed even by strong internal heat in case of fire.

In particular, as buildings and apartments are now very high-rise, the risk of fire is greatly increased. Since property damage occurs, the role of fire doors is very important.

In order to lighten the load of the fire door, which is made of metal, the fire door is formed separately from the front panel and the rear panel, and a heat insulating material is inserted into the spaced apart space to lighten the weight of the fire door while improving insulation, sound insulation, and heat dissipation effect. The fire door is mainly installed in a frame formed of a rectangular frame body having a predetermined shape, and hinges corresponding to hinge shafts fixed to upper and lower ends of the fire door are mounted on upper and lower portions of one side of the frame, respectively.

On the other hand, the fire door must meet the fire door standard requirements of the Ministry of Land, Infrastructure and Transport Notice No. 2015-212, and the fire resistance test method of the fire door is prescribed in Article 5 of this notice. The fire door test method according to these regulations must have fire resistance performance of more than 1 hour at 980 ℃ temperature condition. The fire resistance performance refers to the property that the fire door does not burn well and is not bent by heat even under the above temperature conditions, and has the same meaning as fire resistance. If the fire door is bent by heat, flames and toxic gases caused by the fire are diffused between spaces partitioned by the fire door, so the fire door must have certain fire resistance performance.

Therefore, in order to improve fire resistance, conventional techniques for inserting an inner frame into a plate material constituting a skeleton of a fire door have been developed.

As such a prior art, Korean Patent Publication No. 10-2010-0043416 "airtight fire door and method of manufacturing the same" has been disclosed. It includes first and second steel plates and a reinforcing member installed between the first and second steel plates, wherein a plurality of weld holes for fixing the reinforcing member are formed in the second steel plate.

However, in the prior art, a first steel plate is welded to a frame forming a door, a plurality of reinforcing materials are welded to the first steel plate, a second steel plate is welded to the frame, and a plurality of steel plates formed on the second steel plate are welded to the frame. Since both the reinforcing material and the second steel plate must be welded by a welder, the cost and time of the assembly process of the first and second steel plates and the reinforcing material increase, and thus the production efficiency decreases.

In order to solve this problem, Korean Patent Registration No. 10-1849919 discloses a "fire door reinforcement structure", the prior art is installed on the inside of the door body of a fire door composed of a door body and a cover to reinforce, First and second edge reinforcing members made of shaped steel and installed so that the respective ribs face each other on the upper and lower parts, and the third and fourth edge reinforcing members made of U-shaped steel and installed so that the ribs on the left and right sides face each other, and It consists of a U-shaped steel or a ㅁ-shaped steel with extension ribs formed at the ends, and includes one or more central reinforcing members installed vertically to connect between the first and second edge reinforcing members.

However, in the prior art, the first and second edge reinforcing members and the third and fourth edge reinforcing members are screwed together by a connecting member, and the center reinforcing member is welded between the first and second edge reinforcing members. It is a structure in which work is assembled while working in parallel, and the assembly process is complicated, which increases manufacturing cost and time, and thereby reduces production efficiency.

In addition, since the prior art attaches double-sided tapes to both sides of the central reinforcing member among the reinforcing structures composed of the first to fourth edge reinforcing members and the central reinforcing member and attaches them to the door body and the cover, The binding force was poor, and there was a limit to the fireproof performance and durability of the fire door.

Therefore, it is necessary to develop a fire door capable of improving fire resistance performance and durability in the event of a fire by means of a reinforcing structure, as well as increasing production efficiency by simplifying the assembly time and process of the reinforcing structure.

Korean Patent Laid-open Publication No. 10-2010-0043416 (published on April 29, 2010) "Classified fire door and its manufacturing method" Republic of Korea Patent Registration No. 10-1849919 (Announced on April 19, 2018) "Reinforcing structure for fire doors"

In order to solve the above problems, the present invention is a structural reinforcing frame installed between the first and second steel plates, the upper and lower frames and vertical reinforcing frames are fitted and coupled, and the upper and lower frames and side frames adjacent to each other are directly connected to each other. At the same time, as the vertical reinforcing frame and the contact surfaces of the first and second steel plates are bonded by the foam expansion tape, the fire resistance performance and durability are enhanced by the structural reinforcing frame, as well as the combined structure The purpose is to provide a fire door with a built-in structural reinforcement frame that improves production efficiency through

In order to achieve the above object, the present invention is a fire door composed of first and second steel plates and a structural reinforcing frame installed between the first and second steel plates to prevent structural deformation, wherein the structural reinforcing frames are upper and lower frames And a side frame connecting the upper and lower frames and a vertical reinforcing frame coupled between the upper and lower frames, but the upper and lower frames and the vertical reinforcing frames are formed with upper and lower fitting holes and fitting protrusions, respectively, so that each other Structural reinforcing frame characterized in that the upper and lower frames and the side frames are fastened as a direct connection piece and combined into a steel structure without welding, and at the same time, a foamed expansion tape is formed between the vertical reinforcing frame and the first and second steel plates. Provides a built-in fire door.

In addition, the upper and lower ends of the first and second steel plates are folded, and the upper and lower frame ends are inserted therebetween, and a cover frame is inserted into the first and second steel plates and the upper and lower frames to form a direct connection piece. characterized by being

In addition, first and second steel plate bending portions bent in opposite directions are formed on one side of the first and second steel plates to surround at least a portion of the structural reinforcing frame, and the side surfaces of both ends of the upper and lower frames of the structural reinforcing frame. It is characterized in that the upper and lower frame bent portions bent in the longitudinal direction of the frame are formed to contact the side frame, and the first and second steel plates, the upper and lower frames, and the side frame are coupled together as a direct connection piece.

In addition, the upper and lower fitting holes of the upper and lower frames extend in a direction perpendicular to the first and second steel plates, and the fitting protrusions of the vertical reinforcing frame protrude from both ends of the vertical reinforcing frame and are fitted together. characterized by being

In addition, the foamed expansion tape is formed on the surface of the structural reinforcing frame facing the vertical reinforcing frame and the first and second steel plates, and is expanded by high temperature in case of fire to prevent structural deformation of the first and second steel plates. do.

According to an embodiment of the present invention, the upper and lower frames and the vertical reinforcing frames of the structural reinforcing frame are fitted and coupled, and the upper and lower frames and side frames adjacent to each other are piece-coupled, and the upper and lower frames and the side frames are By being coupled to the first and second steel plates, there is an effect of enhancing fire resistance performance and durability by the structural reinforcing frame in the event of a fire.

According to an embodiment of the present invention, the contact surfaces of the vertical reinforcing frame and the first and second steel plates of the structural reinforcing frame are bonded by the foamed expansion tape, so that the first and second steel plates are expanded by high temperature in the event of a fire. As the structural deformation of the steel plate is prevented, fire spread is delayed, thereby improving fire safety.

According to an embodiment of the present invention, as the structural reinforcing frame installed between the first and second steel plates, the upper and lower frames, the side frames, and the vertical reinforcing frame of the structural reinforcing frame are combined into a steel structure without welding, the structural reinforcing frame The assembly process and time are shortened, cost is reduced, and production efficiency is improved.

1 is a perspective view of a fire door according to an embodiment of the present invention;
Figure 2 is an exploded perspective view of a fire door according to an embodiment of the present invention.
Figure 3 is a perspective view showing a state in which any one of the first and second steel plates and the cover member are separated according to an embodiment of the present invention.
Figure 4 is a cross-sectional view AA of Figure 1;
5 is an enlarged view of part A of FIG. 4;
Figure 6 is a BB cross-sectional view of Figure 1;
7 is an enlarged view of part B of FIG. 6;

The detailed description of the present invention below refers to the accompanying drawings shown as examples of embodiments in which the present invention can be practiced. These embodiments are described in detail so that those skilled in the art will be able to practice the present invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in one embodiment in another embodiment without departing from the spirit and scope of the invention. Additionally, it should be understood that the location or arrangement of individual components within each described embodiment may be changed without departing from the spirit and scope of the invention.

Accordingly, the detailed description set forth below is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all equivalents as claimed by those claims. Like reference numbers in the drawings indicate the same or similar function throughout the various aspects.

The terms used in the present invention have been selected from general terms that are currently widely used as much as possible while considering the functions in the present invention, but these may vary depending on the intention of a person skilled in the art or precedent, the emergence of new technologies, and the like. In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, not simply the name of the term.

In the present invention, when a part "includes" a certain component, it means that it may further include other components, not excluding other components, unless otherwise stated.

Hereinafter, a fire door 1 having a structural reinforcement frame according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a fire door according to an embodiment of the present invention, Figure 2 is an exploded perspective view of a fire door according to an embodiment of the present invention, Figure 3 is any one of the first and second steel plates according to an embodiment of the present invention A perspective view showing a state in which the cover member is separated, FIG. 4 is a cross-sectional view A-A of FIG. 1, FIG. 5 is an enlarged view of part A of FIG. 4, FIG. 6 is a cross-sectional view B-B of FIG. 1, and FIG. This is a partial enlargement.

As shown, the fire door (1) with a structural reinforcement frame built-in according to an embodiment of the present invention is installed between the first and second steel plates (10, 20) and the first and second steel plates (10, 20). In the fire door made of a structural reinforcing frame (30) that prevents deformation, the structural reinforcing frame (30) is a side frame (60) connecting the upper and lower frames (40, 50) and the upper and lower frames (40, 50). ) And the vertical reinforcing frame 70 coupled between the upper and lower frames 40 and 50 may be configured. The fire door is a type of door designed to prevent penetration of flame in case of fire, although it is generally possible for people to pass through, and plays an important role in preventing fire damage.

The fire door (1) in which the structural reinforcement frame is embedded according to an embodiment of the present invention will be described separately for each configuration as follows.

The first steel plate 10 and the second steel plate 20 are spaced apart from each other at a predetermined interval while being parallel to each other. As shown in FIG. 1 , the first steel plate 10 and the second steel plate 20 are formed by being widely spread in a plate shape, and may be formed to fit the shape of an opening. For example, in the case of a rectangular opening, the shape of the first steel plate 10 and the second steel plate 20 may also be rectangular, and in the case of an oval or circular opening, the first steel plate 10 and the second steel plate 20 ) may be formed in a shape suitable for the shape of the opening. At this time, the first steel plate 10 and the second steel plate 20 may be manufactured by press-working an iron plate having a predetermined thickness, respectively.

On the other hand, the first and second steel plates 10 and 20 are formed at a position in direct contact with the fire at the outermost edge of the fire door when a fire occurs, and the interior material located inside (內裝材, for the inside of the building) It serves to prevent the materials used for finishing and decoration) from being directly exposed to external shocks or flames. The first and second steel plates 10 and 20 accommodate a high-temperature insulation material, a composite reflective insulation material, and a low-temperature insulation material therein, and the material may be a metal material. When the material of the first steel plate 10 and the second steel plate 20 is metal, iron, aluminum, tin, cobalt, nickel, copper, Any one or more materials of zinc or alloys thereof may be used, and in particular, it is most preferable to use iron.

As shown in FIG. 2, the upper and lower ends of the first and second steel plates 10 and 20 are folded so that the ends of the upper and lower frames 40 and 50 of the structural reinforcing frame 30 can be inserted therebetween. there is. That is, the upper and lower ends of the first and second steel plates 10 and 20 are bent at 180 degrees so that they overlap at a predetermined interval from one surface of the first and second steel plates 10 and 20, and into the space formed in this way The upper and lower ends of the upper and lower frames 40 and 50 may be inserted and fixed.

Meanwhile, as shown in FIG. 7 , a cover frame 80 may be inserted into the first and second steel plates 10 and 20 and the upper and lower frames 40 and 50 to be coupled into a direct connection piece. The cover frame 80 is inserted into the inside of the upper and lower frames 40 and 50 while the lower part is opened and both side surfaces are inserted into the bent inner walls of the first and second steel plates 10 and 20. Accordingly, the cover frame 80 protects the upper and lower frames 40 and 50 of the structural reinforcing frame 30 from the outside in case of fire, and both side walls of the cover frame 80 are first and second It is possible to prevent the upper and lower portions of the first and second steel plates 10 and 20 from widening or structural deformation while being tightly adhered to the folded ends of the steel plates 10 and 20 . At this time, the cover frame 80 and the upper and lower frames 40 and 50 are fixedly coupled while passing through the direct connection piece. Here, the direct connection piece means a screw having a screw thread formed on the surface, inserted into a through hole and fixed, and having a straight line or a cross groove formed at one end so that it can be rotated with a tool such as a screwdriver, but is not limited thereto. Various changes can be made within the range of stable and fixed coupling of each part.

As shown in FIG. 5 , a first steel plate bent portion 12 and a second steel plate bent portion 22 may be formed on one side of the first steel plate 10 and the second steel plate 20, respectively. The first and second steel plate bending parts 12 and 22 are formed at the ends of both sides of the first and second steel plates 10, and are bent in opposite directions to surround either side of the structural reinforcing frame 30 while It is fixedly coupled with the structural reinforcing frame 30 and a direct connection piece. In addition, a side cover part 14 is formed on the opposite side of the first and second steel plate bent parts 12 and 22 of any one of the first and second steel plates 10 and 20 to protect the side of the structural reinforcing frame 30. While covering, it can be fixedly coupled to the structural reinforcing frame 30 and a direct connection piece.

The structural reinforcing frame 30 is formed between the first and second steel plates 10 and 20 to space the first and second steel plates 10 and 20 apart at regular intervals, and maintains the frame of the fire door while maintaining the safety of the fire door in the event of a fire. prevent structural deformation. That is, in order to increase the time the fire door can withstand fire, it is necessary to prevent the entire structure of the fire door from being twisted by high temperature. Although the first steel plate 10 and the second steel plate 20 are made of metal, Since the thickness is small compared to the area, the structure is easily deformed by heat. As a result, when the first steel plate 10 and the second steel plate 20 are deformed, the structure of the fire door is also deformed, and the gap between the doors is widened, and flame or toxic gas may enter, putting people inside the fire door at risk. You need a device to do that. Here, it is preferable that the structural reinforcing frame 30 is thicker than the first and second steel plates 10 and 20 to prevent structural deformation of the fire door 1 without being easily deformed by heat.

As shown in FIG. 2, the structural reinforcing frame 30 may be composed of upper and lower frames 40 and 50, a side frame 60 and a vertical reinforcing frame 70.

The upper and lower frames 40 and 50 and the side frames 60 of the structural reinforcing frame 30 according to the present invention form the outer rim of the structural reinforcing frame 30, and the first and second steel plates 10, 20), and can be fixedly coupled to each other.

In order to combine the upper and lower frames 40 and 50 with the side frames 60, upper and lower frame bent portions 42 and 52 may be formed at both ends of the upper and lower frames 40 and 50. There, the upper and lower frame bending parts 42 and 52 are bent in the longitudinal direction of the side frame 60 and can be coupled to a direct piece while in contact with one surface of the side frame 60. That is, the upper and lower frame bent portions 42 and 52 of the upper and lower frames 40 and 50 and both ends of the side frame 60 and the first and second steel plates of the first and second steel plates 10 and 20 The bent parts 12 and 22 are overlapped, and in this state, the upper and lower frames 40 and 50, the side frames 60 and the first and second steel plates 10 and 20 can be coupled together as a direct piece. . At this time, it is preferable that the upper frame bending part 42 and the lower frame bending part 52 extend in directions facing each other and have at least one hole through which a direct connection piece is penetrated.

In order to combine the upper and lower frames 40 and 50 with the structural reinforcing frame 70, at least one upper and lower fitting holes 44 and 54 may be formed in the upper and lower frames 40 and 50. There, the upper and lower fitting holes 44 and 54 are portions to which both ends of the vertical reinforcing frame 70 are coupled, and extend in a direction perpendicular to the first and second steel plates 10 and 20, and are mutually It is preferable that the same number is formed at the corresponding position and arranged to be spaced apart from the upper and lower frames 40 and 50 at regular intervals. In addition, upper and lower extension sidewalls 46 and 56 are formed extending upward or downward on both side surfaces of the upper and lower frames 40 and 50 in contact with the first and second steel plates 10 and 20, and , the lower extension side walls 46 and 56 are inserted into the folded portions of the first and second steel plates 10 and 20.

The side frames 60 of the structural reinforcing frame 30 according to the present invention are coupled to both ends of the upper and lower frames 40 and 50 to form the side walls of the structural reinforcing frame 30 . Both ends of the side frame 60 may be coupled to the upper and lower frames 40 and 50, and either side of the side frame 60 may be connected to the upper and lower frames of the upper and lower frames 40 and 50. It is in close contact with the bent parts 42 and 52, and the back side is in close contact with the first and second steel plate bent parts 12 and 22 of the first and second steel plates 10 and 20, and the upper and lower frame bent parts 42 , 52) and the first and second steel plate bent parts 12 and 22, it can be coupled as a direct connection piece in a state of being sandwiched. One of the side frames 60 is wrapped by the first and second steel plate bending parts 12 and 22, and the other is covered by the side cover part 14 of the first and second steel plates 10 and 20. will be covered

The vertical reinforcing frame 70 of the structural reinforcing frame 30 according to the present invention is disposed inside the upper and lower frames 40 and 50 and the side frame 60 to form the internal skeleton of the structural reinforcing frame 30. In this way, it is vertically inserted between the upper frame 40 and the lower frame 50 to support the upper frame 40 and the lower frame 50, and a predetermined interval is spaced between the first and second steel plates 10 and 20. is disposed, and both side surfaces may be in contact with one surface of the first steel plate 10 and the second steel plate 20, respectively. At this time, as shown in FIGS. 2 and 3, the vertical reinforcing frame 70 has one side open, and its cross section is "c" shaped steel (section shape steel, a generic term for rod-shaped rolled materials having various cross-sectional shapes). It is preferable to form. Although the cross section of the vertical reinforcing frame 70 is shown in a "c" shape in the fire door having a structural reinforcing frame according to an embodiment of the present invention, it is not limited thereto, and various fire doors may vary depending on the fire resistance performance, durability, productivity, etc. can be changed to For example, the cross section of the vertical reinforcing frame 70 is formed in a "C" shape or a sideways "L" shape or "H" shape to improve functions such as fire resistance and durability of the structural reinforcing frame 30. can be further improved.

In order to combine the vertical reinforcing frame 70 and the upper and lower frames 40 and 50, fitting protrusions 74 are protrudingly formed at both ends of the vertical reinforcing frame 70 to form upper and lower frames 40 and 50. ) Can be fitted into the upper and lower fitting holes 44 and 54. As shown in the partially enlarged drawing of FIG. 2, it is appropriate that the fitting protrusion 74 is formed in a form in which the width becomes narrower towards the end so that it can be easily inserted into the upper and lower fitting holes 44 and 54. . Therefore, the operator simply inserts the fitting protrusion 74 of the vertical reinforcing frame 70 into the upper and lower fitting holes 44 and 54 of the upper and lower frames 40 and 50 without performing a separate welding operation. The vertical reinforcing frame 70 and the upper and lower frames 40 and 50 may be fixed and coupled. On the other hand, the fitting protrusion 74 is further extended from the end of the vertical reinforcing frame 70 so that the end of the fitting protrusion 74 is in close contact with the inner surface of the cover frame 80, and through this, the cover frame 80 Structural deformation due to external impact or fire can be prevented.

As shown in FIG. 4, the vertical reinforcing frame 70 and the first and second steel plates 10 and 20 face each other with a foamed expansion tape 90 having a property of being foamed and expanded by constant heat to reinforce the structure. The fire door structure maintenance function of the frame 30 can be further improved. The foamed expansion tape 90 attaches and fixes the vertical reinforcing frame 70 and the first and second steel plates 10 and 20, and at the same time expands by high temperature in case of fire, thereby maintaining the structure of the first and second steel plates 10 and 20. prevent deformation. In addition, the foamed expansion tape 90 prevents direct contact between the structural reinforcing frame 70 and the first and second steel plates 10 and 20, thereby blocking heat transfer in the event of a fire. At this time, the foamed expansion tape 90 is formed on both sides of the vertical reinforcing frame 70 along the longitudinal direction of the vertical reinforcing frame 70, and the vertical reinforcing frame 70 and the first and second steel plates 10 and 20 ) is preferably formed of double-sided tape so that all can be adhered to.

As described above, the fire door (1) with a built-in structural reinforcing frame according to an embodiment of the present invention combines the upper and lower frames (40, 50) and the side frame (60) of the structural reinforcing frame (30) into a direct connection piece And, the upper and lower frames 40 and 50 and the vertical reinforcing frame 70 are fitted and coupled through the upper and lower fitting holes 44 and 54 and the fitting protrusions 74, and at the same time the structural reinforcing frame 30 The upper and lower frames 40 and 50 of ) are inserted into the folded parts of the first and second steel plates 10 and 20, and the cover frame 80 is inserted into the upper and lower frames 40 and 50. By combining the direct connection pieces, the first and second steel plates 10 and 30 and the structural reinforcing frame 30 are assembled into a steel structure without separate welding. Therefore, in the event of a fire, fire resistance performance and durability are enhanced by the structural reinforcing frame 30, as well as the assembly process and time of the structural reinforcing frame 30 are shortened, and production efficiency can be improved by reducing costs. In addition, the foamed expansion tape 90 is formed on the contact surface between the vertical reinforcing frame 70 of the structural reinforcing frame 30 and the first and second steel plates 10 and 20, so that the foamed expansion tape 90 is As the structural deformation of the first and second steel plates 10 and 20 is prevented while the 90 expands, fire spread is delayed and fire safety can be improved.

Although the present invention has been described with the accompanying drawings, this is only one example of various embodiments including the gist of the present invention, and is intended to be easily practiced by those skilled in the art. As an object, it is clear that the present invention is not limited to the embodiments described above. Therefore, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent range by change, substitution, substitution, etc. within the scope of the present invention do not depart from the scope of the present invention. will be included In addition, it is clear that some configurations in the drawings are provided exaggerated or reduced than the actual configuration to more clearly explain the configuration.

1: fire door 10: first steel plate
20: second steel plate 30: structural reinforcement frame
40: upper frame 44: upper fitting hole
50: lower frame 54: lower fitting hole
60: side frame 70: vertical reinforcement frame
74: fitting protrusion 80: cover frame
90: foam expansion tape

Claims (5)

In the fire door made of the first and second steel plates and a structural reinforcing frame installed between the first and second steel plates to prevent structural deformation,
The structural reinforcing frame includes upper and lower frames, side frames connecting the upper and lower frames, and vertical reinforcing frames coupled between the upper and lower frames,
Upper and lower fitting holes and fitting protrusions are formed on the upper and lower frames and the vertical reinforcing frame, respectively, and are fastened to each other, and the upper and lower frames and the side frames are fastened as direct pieces to be combined into a steel structure without welding, and the vertical A foamed expansion tape is formed between the reinforcing frame and the first and second steel plates, the upper and lower ends of the first and second steel plates are folded and the upper and lower frame ends are inserted therebetween, and the first and second steel plates and the upper and lower ends are inserted. , A cover frame with an open bottom is inserted into the lower frame and coupled to a direct piece, and both side surfaces of the cover frame are inserted into the bent inner walls of the first and second steel plates to be in close contact with the folded ends of the first and second steel plates. A fire door with a structural reinforcement frame built into it, characterized in that it is inserted into the inside of the upper and lower frames. delete According to claim 1,
First and second steel plate bent portions bent in opposite directions are formed on one side of the first and second steel plates to surround at least a portion of the structural reinforcing frame, and side frames are formed at both ends of the upper and lower frames of the structural reinforcing frame. The upper and lower frame bending parts bent in the longitudinal direction are formed to come into contact with the side frame, and the first and second steel plates, the upper and lower frames, and the side frame are directly connected together as a structural reinforcement frame. fire door. According to claim 1,
The upper and lower fitting holes of the upper and lower frames extend in a direction perpendicular to the first and second steel plates, and the fitting protrusions of the vertical reinforcing frame protrude from both ends of the vertical reinforcing frame to be fitted to each other. A fire door with a built-in structural reinforcement frame. According to claim 1,
The foamed expansion tape is formed on the surface of the structural reinforcing frame and the first and second steel plates facing each other, and expands by high temperature in case of fire to prevent structural deformation of the first and second steel plates. Fire door with built-in reinforcement frame.

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