Door body reinforcement structure and door body manufacturing method

Abstract

The edge portion of the door body 1 on the door-side is reinforced to prevent warping and deformation due to heat during a fire. [Solution] A cylindrical reinforcing structure is formed by connecting the door-side vertical frame 6 and the adjacent intermediate-side vertical frame 11 with first and second reinforcing members on both the front and back sides, thereby reinforcing the door-side edge portion of the door body 1.

Description

Technical Field

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[0001] The present invention relates to the technical field of a reinforcing structure for a door body that opens and closes an entrance of a building such as a building or a house, and a method for manufacturing the door body.

Background Art

[0002] Generally, a door body (door, door leaf) is provided to open and close an entrance of a building such as a building or a house. When such a door body is adopted for, for example, a double-opening door, the two door bodies are closed with the leading edge portions on the door tip side in contact with each other. However, when a fire breaks out in such a closed posture, the leading edge portions on the door tip side of the door body are in a free end state where they are not supported by the building body side although they are in a contacting structure with each other. Therefore, compared with the trailing edge portion side supported by the building body side, they are more likely to be warped and deformed by the heat of the fire. And when the leading edge portion side is warped and deformed, there is a risk that the contact portions with the airtight materials on the upper and lower sides of the door body and the glass fitting portions of the window portion are damaged and gaps penetrating in the front-rear direction are generated, and it is expected that the fire prevention performance cannot be ensured. Such warping and deformation of the door body is not limited to a double-opening door body, and it is difficult to support the leading edge portion side from the building body side even in a single-opening door body, and there is a risk that the same phenomenon will occur. [[ID=​​​​​​​​​​​​​​​​​​​​​​However, the conventional door structure simply consists of rectangular tubular frame members placed at the leading edge of the door. Therefore, in order to obtain the necessary strength, it is necessary to use strong frame members, such as by making the frame members thicker. As a result, the door itself becomes heavy, impairing the smooth opening and closing operation, and these are the problems that the present invention aims to solve. [Means for solving the problem]

[0005] The present invention was created in view of the above circumstances and with the aim of solving these problems, and the invention of claim 1 is a door body that opens and closes an entrance, comprising a pair of left and right end-side vertical members and a pair of upper and lower-side horizontal members that form a four-sided frame of the door body, and an intermediate-side vertical member adjacent to at least one of the left and right end-side vertical members, and covered with a pair of front and back panels, and in reinforcing the door body, the left and right end-side vertical members and the intermediate-side vertical member are connected via a reinforcing member. The invention of claim 2 is a door body reinforcing structure according to claim 1, characterized in that the reinforcing material is a long plate material that extends to the upper and lower horizontal members, and at least one of the upper and lower edges of the reinforcing material is connected to the corresponding upper and lower horizontal member. The invention of claim 3 is a reinforcing structure for a door body according to claim 1, characterized in that the reinforcing material is provided facing at least one of the front and back panels so as to abut against or be in close proximity to at least one of the front and back panels. The invention of claim 4 is a door body reinforcing structure according to claim 3, characterized in that the reinforcing material is a pair of first and second reinforcing materials provided opposite to the front and back panels, and the left and right end vertical members and the intermediate vertical members on one side are connected in a cylindrical shape by the first and second reinforcing materials connecting the members on both the front and back sides. The invention of claim 5 is a door reinforcement structure according to claim 4, characterized in that the door body has a cylindrical space formed by left and right end vertical members on one side, an intermediate vertical member, and first and second reinforcing members, which is filled with a filling material. The invention of claim 6 is a door body reinforcing structure according to any one of claims 1 to 5, characterized in that the left and right end vertical members on one side are U-shaped with both leg pieces and a straddle piece, the reinforcing member connects the leg piece and the intermediate vertical member, and a third reinforcing member is further provided on the straddle piece. The invention of claim 7 is a method for manufacturing a reinforced door body, comprising a door body for opening and closing an entrance, comprising a pair of left and right end vertical members and a pair of upper and lower horizontal members to form a perimeter frame of the door body, and an intermediate vertical member adjacent to at least one of the left and right end vertical members, and covered with a pair of front and back panels, wherein the door body is reinforced by connecting at least one of the left and right end vertical members and the intermediate vertical member via a pair of front and back first and second reinforcing members arranged to be biased toward the front and back panel side, and the method is as follows: This is a method for manufacturing a door body, characterized in that the following steps are performed over time: a frame arrangement step in which left and right end vertical frame members, upper and lower horizontal frame members, and intermediate vertical frame members are arranged on one side of the front and back panel placed on a manufacturing base; a first reinforcement step in which the left and right end vertical frame members and the intermediate vertical frame members on one side of the left and right are connected to each other on one side of the front and back with a first reinforcing member on one side of the front and back; a second reinforcement step in which the left and right end vertical frame members and the intermediate vertical frame members on one side of the left and right are connected to each other on the other side of the front and back with a second reinforcing member on the other side of the front and back; and a covering step in which the door body is covered with a panel on the other side of the front and back. The invention of claim 8 is a method for manufacturing a door body according to claim 7, characterized in that, between the first reinforcement step and the second reinforcement step, a filling step is performed in which a filling material is filled from the front and back sides of the space formed by the left and right end vertical members, the intermediate vertical members, and the first and second reinforcing members. [Effects of the Invention]

[0006] By adopting the invention of claim 1, the door body, which is provided with left and right end vertical members and intermediate vertical members on one side and covered with a pair of front and back panels, is reinforced by a reinforcing member that connects the left and right end vertical members and the intermediate vertical members on one side. As a result, the left and right end vertical members and the intermediate vertical members on one side become an integrated reinforced structure by the reinforcing member, which makes it possible to create a structure that is highly effective in preventing warping deformation in the event of a fire. By adopting the invention of claim 2, the reinforcing member is elongated, extending to the upper and lower horizontal members, and at least one of its upper and lower edges is connected to the corresponding upper or lower horizontal member. As a result, the door body becomes a reinforced structure that includes the upper and lower horizontal members connected to the reinforcing member, providing more effective reinforcement. By adopting the invention of claim 3, the reinforcing material is positioned opposite at least one of the front and back panels so as to be in contact with or close to at least one of the front and back panels, thereby simplifying the structure. By adopting the invention of claim 4, the reinforcing material is a pair of first and second reinforcing materials provided opposite the front and back panels, and the left and right end vertical members and the intermediate vertical members on one side are connected in a cylindrical shape by the first and second reinforcing materials connecting the members on both the front and back sides, resulting in a higher effect in preventing warping deformation of the door body. By adopting the invention of claim 5, the door body has a cylindrical reinforcing space formed by the left and right end vertical members, the intermediate vertical members, and the first and second reinforcing members, which is filled with a filler material. Thus, even with the presence of the first and second reinforcing members, the door body can be filled with a filler material. By adopting the invention of claim 6, a third reinforcing member is further provided on the strut portion provided on the left and right end vertical members on one of the left and right sides, thereby making it possible to achieve an even higher function of preventing warping deformation. By adopting the invention of claim 7, the manufacturing of a reinforced door body by connecting a pair of first and second reinforcing members on the front and back sides, which are positioned to be biased toward the front and back panel sides, can be done by sequentially executing the following steps: a frame arrangement step of arranging frame materials such as left and right end vertical frame materials; a first reinforcement step of connecting the left and right end vertical frame materials on one side of the front and back with the first reinforcing member on one side of the front and back; a second reinforcement step of connecting with the second reinforcing member; and a covering step of covering with the front and back panel on the other side of the front and back. This makes it possible to manufacture a reinforced door body without further complexity. By adopting the invention of claim 8, if the door body is filled with a filler material, the filling of the filler material only needs to be performed in a filling step between the first reinforcement step and the second reinforcement step, in which the filler material is filled from the front and back sides, thus avoiding the need for each step to be complicated. [Brief explanation of the drawing]

[0007] [Figure 1] This is a front view of the entrance / exit area. [Figure 2] This is a cross-sectional plan view of the entrance / exit area. [Figure 3] (A), (B), and (C) are the front view, side view, and cross-sectional plan view of the door body. [Figure 4] This is a cross-sectional plan view of the main part of the door body, with the filler material omitted. [Figure 5] This is a side cross-sectional view of the main part of the door body, with the filler material omitted. [Figure 6] (A), (B), and (C) are explanatory diagrams showing the manufacturing process of the first half of the door body. [Figure 7] (A), (B), and (C) are explanatory diagrams showing the manufacturing process for the latter half of the door body. [Figure 8] This is a cross-sectional plan view of the main part of the door body, showing a second embodiment with the filler material omitted. [Modes for carrying out the invention]

[0008] The embodiments of the present invention will now be described with reference to the drawings. In the drawings, 1 is an outward-opening door body whose rear edge is pivotally supported via a hinge 4 to a rectangular door frame 3 provided at the entrance E of a building, and in this embodiment, the door body 1 is configured as a double-opening type with the front edges meeting each other. The door body 1 of this embodiment has a window section 2 in the center, and a thin panel body 5 such as a glass plate is incorporated into the window section 2. The present invention is not limited to a double-opening door body, and can be implemented in the same way with a single-opening or inward-opening door body. Furthermore, the present invention can be implemented in the same way with a sliding door body that slides from side to side.

[0009] The door body 1 is constructed using various structural members, including a pair of left and right end-side vertical members 6 and 7 and a pair of upper and lower side horizontal members 8 and 9, which form the four-sided frame of the door body 1 on the leading edge side (corresponding to the "left and right sides" of the present invention) and the trailing edge side. In addition, to form the window frame frame 10 into which the panel body 5 is incorporated, the door body 1 is constructed using various structural members such as a vertical member 10a for the window frame, a horizontal member 10b for the window frame, and an intermediate vertical member 11 disposed between the vertical member 10a for the window frame and the left and right end-side vertical members 6 and 7. The space formed between these structural members is filled with a filler material 12 selected from various filler materials such as honeycomb core material, rock wool, and glass wool, which are used for sound insulation, heat insulation, and fire resistance. The front and back (front and rear) surfaces, which are the interior and exterior surfaces, are covered with a panel 13. The present invention can also be implemented even if the door body 1 is hollow without the filler material 12. Furthermore, a meeting stile projection 1a is formed on the leading edge of the door body 1, so that when the door body 1 is closed, it is not possible to see in front of or behind the entrance E through the gap (gap) between the leading edge parts. In this embodiment, the leading edge of the door body 1 is reinforced, but the trailing edge can also be reinforced in the same way if necessary. Still, on the indoor side, a summons protrusion 1a and an airtight material (sealing material) 1b and 3a are incorporated in the indoor side part of the door frame 3.

[0010] The vertical edge members (hereinafter referred to as "door tip side vertical edge members") 6 on the left and right ends on the door tip side, which is one side of the left and right, are in a U-shaped form with the inner side in the left - right direction of the door body 1 open, and are composed of leg pieces 6a, 6a on both the front and back sides and a spanning piece 6b on the central side. On the other hand, the intermediate side vertical edge member 11 has first finding surface portions 11a on the door tip side and door butt side (left and right) that abut on the outdoor side (corresponding to "one side of the front and back" of the present invention) panel 13 with a gap (opening) in the left - right direction, first prospective surface portions 11b on the door tip side and door butt side (left and right) that are bent from the inner edge in the left - right direction of the first finding surface portion 11a toward the indoor side in the front - back direction, second finding surface portions 11c on the door tip side and door butt side (left and right) that are bent from the indoor side edge of the first prospective surface portion 11b toward the inner side in the left - right direction, second prospective surface portions 11d on the door tip side and door butt side (left and right) that are bent from the inner edge in the left - right direction of the second finding surface portion 11c toward the indoor side in the front - back direction, and a third finding surface portion 11e that becomes a spanning piece of the intermediate side vertical edge member 11 and abuts on the outdoor side panel 13 by connecting the indoor side edge portions of the left and right second prospective surface portions 11d. Thus, it has a convex - character shape with the outdoor side open in plan view.

[0011] On the other hand, the upper horizontal edge member 8, like the door tip side vertical edge member 6, has a U - shaped form with the inner side in the up - down direction open, and is composed of front and back leg pieces 8a, 8a and a spanning piece 8b. Also, the lower horizontal edge member 9 has a Z - shaped form, and is composed of vertical surface portions 9a, 9b on the indoor side and outdoor side, a vertical surface portion 9c in the middle, a bottom surface portion 9d that connects the lower edge portions of the middle vertical surface portion 9c and the outdoor side vertical surface portion 9b, and a top surface portion 9e that connects the upper edge portions of the middle vertical surface portion 9c and the indoor side vertical surface portion 9a. Furthermore, the vertical frame member 10a for the window frame is a vertically long member provided in a state where the horizontal frame member 10b for the window frame abuts or is close to the middle part in the vertical direction. Similar to the vertical frame member 6 at the door tip side, it is configured to reach (be close to or abut) the upper and lower horizontal frame members 8 and 9. And the vertical frame member 10a for the window frame has a U-shape with a pair of front and back leg pieces 10aa and an intermediate straddle piece 10ab, similar to the vertical frame member 6 at the door tip side. And the window part 2 is formed in a square frame shape by the vertical frame member 10a for the window frame and the horizontal frame member 10b for the window frame. On the inner peripheral surface side thereof, the panel plate 5 is fitted and incorporated into the concave groove part S formed by bending the indoor and outdoor face plates 13. The fitted and incorporated panel plate 5 is attached in a state of being prevented from coming off by the detachable pressing edge 2a. Incidentally, 5a is a sealing material. Incidentally, when the vertical frame member 10a for the window frame on the door tip side is adjacent to and opposed to the vertical frame member 6 on the door tip side as in the second embodiment described later, the vertical frame member 10a for the window frame on the door tip side corresponds to the "intermediate side vertical frame member" of the present invention.

[0012] And the door tip side part of the door body 1 configured in this way is reinforced by using the first and second reinforcing members 14 and 15 provided on the indoor side and the outdoor side. Specifically described, the first reinforcing member 14 has its door tip side edge part 14a fixed (welded (fusion welding, melting welding), pasted, adhered, welded, etc.) to the indoor side leg piece part 6a of the vertical frame member 6 at the door tip side, while the door butt side edge part 14b is fixed to the indoor side corner part 11f of the second expected face part 11d and the third found face part 11e on the door tip side of the intermediate side vertical frame member 11, or to the second expected face part 11d close to the indoor side corner part 11f. On the other hand, for the second reinforcing member 15 on the outdoor side, the door tip side edge part 15a is fixed to the outdoor side leg piece part 6a of the vertical frame member 6 at the door tip side, while the door butt side edge part 15b is fixed to the first found face part 11a on the door tip side of the intermediate side vertical frame member 11. By configuring it in this way, the second reinforcing member 15 reinforces the door tip side part by connecting the vertical frame member 6 at the door tip side and the intermediate side vertical frame member 11 on the outdoor side.

[0013] Then, by connecting the door-side vertical frame 6 and the intermediate-side vertical frame 11 using the first and second reinforcing members 14 and 15 in this manner, the door-side vertical frame 6 and the intermediate-side vertical frame 11, which are adjacent to each other on the left and right, are connected in a rectangular tubular shape via the first and second reinforcing members 14 and 15 on their front and back sides, forming a single integrated structure that constitutes part of the reinforcing structure. Furthermore, in this embodiment, a third reinforcing member 16 is provided on the overlapping portion 6b of the vertical frame member 6 on the door edge side, which contributes to increased strength.

[0014] Furthermore, the upper and lower edges 14c, 14d, 15c, and 15d of the first and second reinforcing members 14 and 15 extend to the upper and lower horizontal members 8 and 9. However, while the upper edges 14c and 15c are fixed (welded or attached) to the leg portion 8a of the upper horizontal member 8, the lower edges 14d and 15d are in contact with or in close proximity to the lower horizontal member 9 and are not fixed together. Of course, they may be fixed together if necessary. Incidentally, the upper and lower edges 14c, 14d, 15c, and 15d of the first and second reinforcing members 14 and 15 are preferable from a reinforcement standpoint to be fixed to at least one of the first and second reinforcing members 14 and 15 as needed. However, depending on the door body 1, if sufficient strength can be obtained even without fixing, then fixing is not necessarily required.

[0015] Then, the following steps are performed in sequence as a process for manufacturing the door body 1 reinforced with the first and second reinforcing members 14 and 15. In this embodiment, for the sake of explanation, the exterior faceplate 13 is described as being placed on the manufacturing base 17, but of course, it is also possible to manufacture the door with the interior side plate 13 placed on the manufacturing base 17. The process will be explained with reference to Figures 6 and 7. First, a frame placement process (see Figures 6(A) and 6(B)) is performed in which all the frame members, including the door-end side and door-end side vertical frame members 6 and 7, the upper and lower side horizontal frame members 8 and 9, and the intermediate side vertical frame member 11, are placed in their predetermined positions on the exterior side panel 13 which is placed on the manufacturing base 17. Next, the first reinforcement step (see Figure 6(C)) is performed, in which the outdoor leg portion 6a of the door-side vertical frame member 6 and the first visible surface portion 11a of the door-side vertical frame member 11 on the door-side are fixed and connected to the door-side and door-end edge portions 15a and 15b of the second reinforcing member 15. In this embodiment, the door body 1 is filled with filler material 12. Therefore, a filling process (see Figure 7(A)) is performed in which the filler material 12 is filled into the space formed by the various structural members, including the door-side vertical frame member 6 and the first reinforcing member 14, from the open interior side. Note that the intermediate side vertical frame member 11 is in a closed state with its first visible surface portion 11a already fixed to the outdoor side panel, and therefore cannot be filled with filler material 12 in this filling process. Thus, the filler material 12 is pre-filled. However, if the intermediate side vertical frame member 11 is in an open state, the filler material 12 can be filled in this filling process. Subsequently, a second reinforcement step (see Figure 7(B)) is performed, in which the outdoor leg portion 6a of the door-side vertical frame member 6 and the first visible surface portion 11a of the door-side vertical frame member 11 are fixed and connected to the door-side and door-end edge portions 14a and 14b of the first reinforcing member 14. Finally, a covering process is performed in which the other side panel 13 is used to cover the remaining part (see Figure 7(C)). Incidentally, the indoor side, the outdoor side panel 13, and various structural members such as the door-side vertical frame 6, the window frame vertical frame 10a, and the intermediate side vertical frame 11 are fixed together by means of adhesive, bonding, or other fastening methods. In this way, the door body 1 reinforced with the first and second reinforcing members 14 and 15 can be easily manufactured.

[0016] In this embodiment, configured as described above, the door body 1 comprises a door-side vertical frame 6 and an intermediate vertical frame 11 adjacent to the door-side vertical frame 6, and is covered by a pair of front and back face panels 13. As a result, the door-side portion of the door body 1 is reinforced by first and second reinforcing members 14 and 15 connecting the door-side vertical frame 6 and the intermediate vertical frame 11, thereby effectively preventing warping deformation of the door-side portion of the door body 1 in the event of a fire. Furthermore, since the door body 1 is reinforced by two types of reinforcing materials, the first and second reinforcing materials 14 and 15, a higher warp deformation effect can be achieved. In this case, the first and second reinforcing materials 14 and 15 can be used to reinforce the door in a rigid rectangular tubular structure, including the door-side vertical frame 6 and the intermediate vertical frame 11. The door-side vertical frame 6 and the intermediate vertical frame 11 themselves also play a role as reinforcing members, thus simplifying the structure.

[0017] In the door body 1 reinforced by the first and second reinforcing members 14 and 15 in this manner, the space formed between the first and second reinforcing members 14 and 15 can be filled with a filler material 12. As a result, if the filler material 12 is a sound-insulating material, for example, the sound-insulating function will not be impaired in the reinforced door-side portion of the door body 1.

[0018] Furthermore, regarding the manufacturing of the door body 1 in which the door edge portion is reinforced in this manner, A component placement process in which all components, including the door-end side and door-end side vertical components 6 and 7, the upper and lower side horizontal components 8 and 9, and the intermediate side vertical components 11, are placed in their predetermined positions on the exterior side panel 13 which is placed on the manufacturing base 17. - A first reinforcing step in which the outer leg portion 6a of the door-side vertical frame member 6 and the first visible surface portion 11a of the door-side vertical frame member 11 are fixed and connected to the door-side and door-end edge portions 15a and 15b of the second reinforcing member 15. Since the door body 1 is filled with filler material 12, the filling process involves filling the door body 1 with filler material 12 from the open interior side into the space formed by the various structural members, including the door edge side vertical structural member 6 and the second reinforcing member 15. The second reinforcement step involves fixing and connecting the indoor leg portion 6a of the door-side vertical frame member 6 and the first visible surface portion 11a of the door-side vertical frame member 11 to the door-side and door-end edge portions 14a and 14b of the first reinforcing member 14. • Covering process: Covering with the interior side panel 13. By executing each of these processes in sequence, it is possible to manufacture the reinforced door body 1 without making each step unnecessarily complex.

[0019] It should be noted that the present invention is not limited to the above-described embodiment. In the above embodiment, an intermediate vertical member 11 is provided between the door-side vertical member 6 and the window frame vertical member 10a of the window frame frame 10, and the intermediate vertical member 11 and the door-side vertical member 6 are reinforced using first and second reinforcing members 14 and 15. However, if the door body 1 is narrow in width or the window section 2 is wide in width and there is no intermediate vertical member 11, then, as shown in the second embodiment in Figure 8, the window frame vertical member 10a adjacent to the door-side vertical member 6 can be used as the intermediate vertical member, and the door-side vertical member 6 and the door-side window frame vertical member 10a can be connected with first and second reinforcing members 14 and 15. Of course, the present invention can be implemented as this embodiment even if there is no window section 2. Furthermore, in these embodiments, since the door body 1 is filled with filler material 12, a filling step for filling the filler material 12 is performed between the first reinforcement step and the second reinforcement step. However, if the door body 1 is not filled with filler material 12, the filling step can be omitted, thus avoiding the need for separate and complicated steps. Furthermore, the intermediate vertical support member 11 may or may not be the same shape as the door-edge vertical support member 6. Furthermore, in this embodiment, the first and second reinforcing members 14 and 15 are provided on the leading edge side to reinforce the leading edge side of the door body 1. However, if it is necessary to reinforce the trailing edge side, it goes without saying that the configuration may be such that the trailing edge vertical member 7 is connected to the adjacent trailing edge intermediate vertical member 11 or window frame vertical member 10a. [Industrial applicability]

[0020] This invention can be used as a reinforcing structure for door bodies that open and close entrances to buildings such as office buildings and houses, and as a method for manufacturing door bodies. [Explanation of symbols]

[0021] 1 Door Body 2 Window section 3 Door frame 6. Vertical support members on the door front side (vertical support members on the left and right ends of one side) 6a Leg piece 6b Straddle part 8. Upper horizontal structural members 9 Lower horizontal aggregate 10 Window frame frames 10a Vertical support material for window frame (intermediate vertical support material) 11. Intermediate vertical structural members 12 Filling material 13 Face plate 14 First reinforcement 14c Top edge 15 Second reinforcement 15c Top edge 16 Third reinforcement 17 Manufacturing base E Entrance / Exit Area

Claims

1. The door body for opening and closing the entrance is comprised of a pair of left and right end vertical members and a pair of upper and lower horizontal members that form the perimeter frame of the door body, and an intermediate vertical member adjacent to at least one of the left and right end vertical members, and is covered with a pair of front and back panels. In reinforcing the door body, A door reinforcement structure characterized by connecting the left and right end vertical members and the intermediate vertical members on at least one side of the door body via a reinforcing material.

2. The reinforcing material is a long, flat board that extends to the upper and lower horizontal structural members. The reinforcing structure for a door body according to claim 1, characterized in that at least one of the upper and lower edges of the reinforcing material is connected to the corresponding upper or lower horizontal frame member.

3. The reinforcing material is provided opposite to at least one of the front and back panels so as to be in contact with or in close proximity to at least one of the front and back panels, as described in claim 1.

4. The reinforcing members are a pair of first and second reinforcing members provided opposite each other on the front and back panels. The door body reinforcement structure according to claim 3, characterized in that the left and right end vertical members and the intermediate vertical members on one side are connected in a cylindrical shape by the first and second reinforcing members connecting the members on both the front and back sides.

5. The door body reinforcement structure according to claim 4, characterized in that the door body has a cylindrical space formed by vertical members on the left and right end sides, intermediate vertical members, and first and second reinforcing members, in which a filling material is filled.

6. The left and right end vertical members on one side are U-shaped, with both leg sections and a straddling section, and the reinforcing members connect the leg sections to the intermediate vertical members. The reinforcing structure for a door body according to any one of claims 1 to 5, characterized in that a third reinforcing member is further provided in the straddling portion.

7. The door body that opens and closes the entrance is constructed to include a pair of left and right end vertical members and a pair of upper and lower horizontal members that form the perimeter frame of the door body, and an intermediate vertical member adjacent to at least one of the left and right end vertical members, and is covered with a pair of front and back panels. A method for manufacturing a reinforced door body, wherein the left and right end vertical members and the intermediate vertical members on at least one side are connected via a pair of first and second reinforcing members arranged to be biased toward the front and back panel sides, and the method is as follows: - A material arrangement process in which vertical structural members are placed on the left and right ends, horizontal structural members on the top and bottom, and vertical structural members in the middle, on one side of the front or back panel that is placed on the manufacturing base. - The first reinforcement step involves connecting the left and right end vertical members and the intermediate vertical members on one side of the left and right sides with the first reinforcing member on the same side. - A second reinforcement step in which the left and right end vertical members and the intermediate vertical members on one side are connected to each other on the other side using a second reinforcing member on the other side. - A covering process in which the front and back panels are used to cover the other side. A method for manufacturing a door body, characterized in that each of the steps is performed over time.

8. Between the first reinforcement process and the second reinforcement process, - A process of filling the space formed by the left and right end vertical members, the intermediate vertical members, and the first and second reinforcing members on one side with filler material from the front and back sides, on the other side. A method for manufacturing a door body according to claim 7, characterized in that the following is performed.

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