Door body

Abstract

To enhance the rigidity and strength of a door body without depending on an increase in the number of intermediate frames in the door body of a waterproof door.SOLUTION: In a door body 2 having a height H and including a framework including a horizontal frame including an upper frame 3 and a lower frame 4 and a vertical frame including a door leading end-side vertical frame 5, a door trailing end-side vertical frame 6, and a plurality of intermediate frames 7, and surface materials 9A and 9B attached to the framework, the framework is provided with a plurality of horizontal members (a first horizontal member 8A, a second horizontal member 8B, and a third horizontal member 8C) in a height range of H / 3 and H / 2 from a lower end.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a door body. [Background technology]

[0002] When the door body of a waterproof door is fully closed, all four sides of the door body come into contact with the watertight rubber that is formed around the door frame, forming a waterproof structure around the door body. As the flood height increases, water pressure acts on the door body, making it more likely to bend. If the deflection exceeds a threshold, the adhesion between the door body and the watertight rubber weakens, potentially causing water leakage. Therefore, for example, if a waterproof door is required to withstand flooding of 3 meters or more, it is necessary to increase the strength of the door body to prevent deflection.

[0003] One way to increase the rigidity and strength of the door body is to increase the number of ribs, but increasing the number of ribs leads to an increase in the weight of the door body, and it becomes necessary to change the type of biaxial hinge to one with better load-bearing performance or to increase the number of biaxial hinges, which increases the cost of the door body. Also, arranging the ribs closely across the width of the door body leads to limitations in production because the spacing between the ribs is too narrow.

[0004] It is necessary to increase the rigidity and strength of the door body without increasing the number of ribs. Patent Document 1 describes providing a cross member on the door body, but does not consider how to efficiently arrange multiple cross members. [Patent Document 1] Patent Publication No. 2014-105489 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] The present invention aims to increase the rigidity and strength of a waterproof door door body without relying on an increase in the number of ribs. [Means for solving the problem]

[0006] The technical means adopted by the present invention are: A framework consisting of a horizontal frame consisting of an upper frame and a lower frame, and a vertical frame consisting of a door end vertical frame, a door end vertical frame, and multiple central ribs; A surface material attached to the framework, and a door body having a height dimension H, The framework is provided with a plurality of horizontal members (8A, 8B, 8C; 8A, 8B; 8A', 8B) in the height range of H / 3 and H / 2 from the bottom end. The door body. In one embodiment, the door body is designed to withstand flooding up to its entire height (for example, a flood height of 3 m), and five or more ribs are arranged at intervals across the width of the door body. In one embodiment, H=2400 mm.

[0007] In one embodiment, the framework further comprises one or more cross members (8D, 8E; 8E') located above a height of H / 2 from the bottom end (referred to as the "central height") and below a height of H / 4 from the top end. In one embodiment, the one or more cross members are located below a position 500 mm above the central height. In one embodiment, the framework has no cross members below H / 3 from the bottom end. In one embodiment, the framework has no cross members above H / 4 from the top end. In one embodiment, all of the horizontal members in the frame are positioned between a height of H / 3 from the bottom end and a height of H / 4 from the top end, i.e., all of the horizontal members are positioned offset toward the center of the door panel in the height direction.

[0008] In one embodiment, the framework is provided with a plurality of horizontal members (8C, 8D) located near the central height. In one embodiment, the plurality of horizontal members provided near the central height are provided near the upper side and / or the lower side of the central height. In one embodiment, the plurality of horizontal members located near the central height include one or more horizontal members (8D) located near the upper side of the central height. In one embodiment, the plurality of horizontal members positioned near the central height include one or more horizontal members (8C) positioned near the lower side of the central height. In one embodiment, in the vicinity above and below the central height (central height ±h1), h1≦250 mm, preferably 100 mm≦H1≦250 mm.

[0009] In one embodiment, the horizontal member is fixed (for example, welded) to the vertical frame in a state where the horizontal member is inserted through the vertical frame. [Effects of the Invention]

[0010] According to the present invention, by efficiently arranging multiple cross members in the framework of the door body, the framework is reinforced by the cross members, and the rigidity and strength of the door body can be improved without relying on an increase in the number of center ribs. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a front view of the waterproof door (fully closed state) according to the present embodiment, viewed from the outdoor side. [Figure 2] FIG. 2 is a vertical cross-sectional view of the door body of the waterproof door according to the present embodiment. [Figure 3] FIG. 2 is a cross-sectional view of the door body of the waterproof door according to the present embodiment. [Figure 4] FIG. 2 is a diagram showing the framework of the door body according to the first embodiment. [Figure 5] FIG. 10 is a diagram showing the framework of the door body according to the second embodiment. [Figure 5A] FIG. 10 is a diagram showing the framework of the door body according to the third embodiment. [Figure 6] FIG. 10 is a diagram showing the framework of the door body according to the fourth embodiment. [Figure 7] FIG. 11 is a diagram showing the framework of the door body according to the fifth embodiment. [Figure 8] FIG. 10 is a diagram showing the relationship between the cross member and the rib. [Figure 9] FIG. 10 is a diagram showing the relationship between the cross member and the rib. [Figure 10] FIG. 1 is a diagram of a triangular distributed load model showing the action of water pressure. [Figure 11] This shows a frame in which five horizontal members are arranged at equal intervals along the height of the door body (comparison example). DETAILED DESCRIPTION OF THE INVENTION

[0012] [A] Overall structure of waterproof door device An embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a front view of a waterproof door (fully closed state) according to this embodiment as seen from the outdoor side. Fig. 2 is a vertical cross-sectional view of the door body of the waterproof door according to this embodiment. Fig. 3 is a horizontal cross-sectional view of the door body of the waterproof door according to this embodiment. This embodiment relates to a single-wing door, but the present invention can also be applied to the door body of a double-wing door.

[0013] As shown in Figure 1, the waterproof door of this embodiment consists of a vertically rectangular door frame 1 that forms an opening in a building, and a door body 2 that opens and closes the opening. The door frame 1 is formed into a four-sided frame shape consisting of a horizontally extending upper frame 10, a horizontally extending lower frame 11, a vertically extending leading edge frame 12, and a vertically extending trailing edge frame 13. The trailing edge portion of the door body 2 is rotatably attached to the trailing edge frame 13 by a biaxial hinge 14. A handle 15 and a keyhole 16 are provided in the middle portion of the door body 2 in the height direction on the leading edge side, and a locking device 17 (see Figure 4) is built in inside.

[0014] The door frame 1 has grooves (not shown) formed around its four periphery that open toward the outdoors, and elastic watertight members (not shown) are attached to the grooves along their entire length. When the opening is fully closed, the indoor portion of the door body 2 abuts and tightly contacts the watertight members on all four sides, above, below, and at the door edge, to form a waterproof structure. This type of waterproof structure is a well-known configuration for waterproof doors.

[0015] [B] Door body [B-1] Overall configuration As shown in Figure 4, the door body 2 has a metal (steel, stainless steel, etc.) frame structure or framework consisting of an upper frame 3, a lower frame 4, a vertical frame 5 on the door front end, a vertical frame 6 on the door rear end, and multiple central ribs 7, which constitute the main frame. Two surface materials 9A and 9B, formed by bending metal (steel or stainless steel) plate material into a predetermined shape, are attached to the framework (by gluing or welding in the case of steel, or by gluing in the case of stainless steel). The surface materials attached to the frame structure form an outdoor side surface portion 20, an indoor side surface portion 21, an upper surface portion 22, a lower surface portion 23, a door front end surface 24, and a door rear end surface 25. More specifically, the surface material 9A forms the outdoor side portion 20, the outdoor half of the top surface 22, the outdoor half of the leading edge surface 24, and the outdoor half of the trailing edge surface 25, while the surface material 9B forms the indoor side portion 21, the indoor half of the top surface 22, the indoor half of the leading edge surface 24, and the indoor half of the trailing edge surface 25.

[0016] [B-2] Frame 2, the upper frame 3 according to this embodiment is formed from a long frame material that extends horizontally in a U-shaped cross section from an upper edge 30 and a pair of visible edges 31, 32. The upper folded edges of surface material 9A and the upper folded edges of surface material 9B are respectively fixed to the upper edge 30 of the upper frame 3 (in the case of steel, the butt joints of the folded edges and the upper edge 30 are welded, and in the case of stainless steel, each folded edge is screwed to the upper edge 30), forming an upper surface portion 22, with the upper end portion of the surface portion of surface material 9A bonded (or welded) or abutting against the visible edge 31, and the upper end portion of the surface portion of surface material 9B bonded or abutting against the visible edge 32.

[0017] 2, the bottom frame 4 according to this embodiment is formed from a long frame material that extends horizontally in a U-shape in cross section from an upper edge 40 and a pair of visible edges 41, 42. The lower end portion of the surface portion of the surface material 9A is bonded (or may be welded) to the visible edge 41, and the lower end portion of the surface portion of the surface material 9B is bonded (or may be welded) to the visible edge 42, forming a concave bottom surface portion 23 in the bottom frame 4. The orientation of the bottom frame 4 may be reversed upside down, in which case the lower bent edges of the surface material 9A and the lower bent edges of the surface material 9B are welded or screwed to the bottom edge of the bottom frame 4 to form the bottom surface portions.

[0018] 3, the door-leading side vertical frame 5 according to this embodiment is formed from a long frame material that extends vertically in a U-shape in cross section from a projected edge 50 and a pair of visible edges 51, 52. The door-leading side bent edge of the surface material 9A and the door-leading side bent edge of the surface material 9B are welded or screwed to the projected edge 50 of the door-leading side vertical frame 5 to form a door-leading side end face 24, and the door leading end portion of the surface of the surface material 9A is bonded (may be welded) or abuts against the visible edge 51, and the door-leading side end portion of the surface of the surface material 9B is bonded (may be welded) or abuts against the visible edge 52.

[0019] As shown in Figure 3, the trailing edge vertical frame 6 of this embodiment is formed from a long frame material that extends vertically in a U-shape in cross section from a projected edge 60 and a pair of visible edges 61, 62. The bent edge of the surface material 9A on the trailing edge side and the bent edge of the surface material 9B on the trailing edge side are welded or screwed to the projected edge 60 of the trailing edge vertical frame 6 to form a trailing edge end surface 25. The leading edge portion of the surface of the surface material 9A is bonded (or welded) or abuts against the visible edge 61, and the leading edge portion of the surface of the surface material 9B is bonded (or welded) or abuts against the visible edge 62. In this embodiment, the visible dimension of the visible edge 61 is larger than the visible dimension of the visible edge 62, taking into account the attachment of the biaxial hinge 14.

[0020] As shown in FIG. 4 , in this embodiment, five ribs 7 are arranged at equal intervals in the width direction of the door body 2. The ribs 7 in this embodiment are formed from a long frame material that extends vertically in a U-shape in cross section from a projected edge 70 and a pair of visible edges 71, 72. The U-shaped frame material is oriented such that the ribs 7 are open toward the trailing edge, but this is not limitative. The ribs 7 are vertical frames that extend in the height direction of the door body 2, similar to the leading edge vertical frame 5 and trailing edge vertical frame 6, but the upper and lower ends of the ribs 7 do not reach the upper and lower frames 3 and 4. The upper and lower ends of the ribs 7 may reach the upper and lower frames 3 and 4. The number of ribs 7 is not limited to five, as long as there are multiple ribs.

[0021] [B-3] Flood height 3m specification The waterproof door of this embodiment is designed to withstand flood pressure up to a 3-meter height and must withstand the water pressure across the entire height of the door body 2. Figure 10 shows a triangular load distribution model representing the effect of water pressure. The load acts most heavily on the lower end of the door body 2, but deflection can occur near the height range of H / 3 and H / 2 from the lower end. Increasing the number of ribs 7 can increase the rigidity and strength of the door body 2, but doing so increases the weight of the door body 2. This requires changing the type of biaxial hinge to one with better load-bearing performance or increasing the number of biaxial hinges, which increases the cost of the door body 2. Furthermore, the door body 2 of this embodiment has five ribs 7 spaced apart across the width of the door body. Adding more ribs between each rib 7 would limit production due to the narrow spacing.

[0022] [B-4] Cross member In the frame of this embodiment, multiple horizontal members 8 are arranged horizontally and parallel to the width of the door body 2 at intervals in the height direction. By providing multiple horizontal members 8 in the frame, deflection of the ribs 7 is suppressed, and the rigidity and strength of the door body 2 can be improved without increasing the number of ribs 7. The door body 2 is vertically long, and even if the unit weight of the ribs 7 and the horizontal members 8 is assumed to be the same, the weight of one horizontal member 8 is lighter than the weight of one rib 7. It is also possible to reduce the number of ribs 7 by increasing the number of horizontal members 8. The horizontal members 8 are made of metal (steel, stainless steel, etc.). In one aspect, in manufacturing the door body 2, the vertical frames (front-end vertical frame 5, rear-end vertical frame 6, and multiple ribs 7) and multiple horizontal members 8 are welded to form the frame, and then the top frame 3 and bottom frame 4 are welded. In addition, both longitudinal ends of the horizontal member 8 are welded to the vertical frames (vertical frame 5 on the door front side and vertical frame 6 on the door rear side, and rib 7 if the length of the horizontal member 8 is short), but the middle part of the horizontal member 8 does not need to be welded as long as it abuts the vertical frame (rib 7).

[0023] [B-4-1] First embodiment (Fig. 4) 1 and 4, five horizontal members 8 are provided, and the horizontal members are collectively designated by the reference symbol "8," with reference symbols 8A to 8E assigned to identify each horizontal member 8. In Fig. 4, in a door body 2 having a height dimension H (H = 2400 mm), a first horizontal member 8A is provided horizontally at a height position of H / 3 from the bottom end of the door body 2. The first horizontal member 8A passes through the projected edges 70 of each rib 7 and is fixed (welded) to or abuts against the projected edges 70, with its leading edge end fixed (welded) to the leading vertical frame 5 and its trailing edge end fixed (welded) to the trailing vertical frame 6.

[0024] In the door body 2 having a height dimension H (H=2400 mm), the second horizontal member 8B is provided horizontally at a height of H / 2 from the bottom end of the door body 2. The second horizontal member 8B passes through the projected edges 70 of each of the ribs 7 except for the rib 7 located closest to the door leading edge, and is fixed (welded) to or abuts against said projected edges 70, with the leading edge end fixed (welded) to the rib 7 located closest to the door leading edge, and the trailing edge end fixed (welded) to the trailing edge vertical frame 6.

[0025] In the door body 2 having a height dimension H (H=2400 mm), a third horizontal member 8C and a fourth horizontal member 8D are installed horizontally near the top and bottom (±h1) of the second horizontal member 8B. In Fig. 4, h1=100 mm, and the third horizontal member 8C is installed 100 mm below the second horizontal member 8B, and passes through the projected edges 70 of each of the ribs 7 except for the rib 7 located closest to the door leading edge, and is fixed (welded) or abuts against said projected edges 70. The front-end end is fixed (welded) to the rib 7 located closest to the door leading edge, and the trailing-end end is fixed (welded) to the trailing-end vertical frame 6.

[0026] The fourth horizontal member 8D is arranged horizontally 100 mm above the second horizontal member 8B, and passes through the projected edges 70 of each of the ribs 7 except for the rib 7 located closest to the door edge, and is fixed (welded) or abuts against the projected edges 70, with the end on the door edge side being fixed (welded) to the rib 7 located closest to the door edge, and the end on the door trailing edge side being fixed (welded) to the door trailing edge vertical frame 6.

[0027] In the door body 2 having a height dimension H (H=2400 mm), a fifth horizontal member 8E is provided horizontally at a position h2 above the second horizontal member 8B. In Fig. 4, h2=500 mm. The fifth horizontal member 8E passes through the projected edge 70 of each rib 7 and is fixed (welded) to or abuts against the projected edge 70, with its leading edge end fixed (welded) to the leading vertical frame 5 and its trailing edge end fixed (welded) to the trailing vertical frame 6.

[0028] In the first embodiment, the first horizontal member 8A, the second horizontal member 8B, and the third horizontal member 8C are arranged in the height range of H / 3 and H / 2 from the bottom end, and the fourth horizontal member 8D and the fifth horizontal member 8E are provided above the height H / 2 from the bottom end and below the height H / 4 from the top end. In the first embodiment, all of the multiple horizontal members (the first horizontal member 8A, the second horizontal member 8B, the third horizontal member 8C, the fourth horizontal member 8D, and the fifth horizontal member 8E) are arranged between the height H / 3 from the bottom end and the height H / 4 from the top end.

[0029] As a comparative example, Fig. 11 shows a frame in which five horizontal members are arranged at equal intervals in the height direction of the door body. Based on the model in Fig. 10, the maximum deflection amount of the door body 2 was calculated for the first embodiment (Fig. 4) and the comparative example in Fig. 11, and it was confirmed that the deflection amount of the frame in the first embodiment is smaller than that of the frame in which five horizontal members 8 are arranged at equal intervals across the height H.

[0030] [B-4-2] Second embodiment (Fig. 5) The second embodiment is a modification of the first embodiment, and in the second embodiment (FIG. 5), h1 = 200 mm, the third cross member 8C is provided 200 mm below the second cross member 8B, and the fourth cross member 8D is provided 200 mm above the second cross member 8B. The positions of the first cross member 8A, the second cross member 8B, and the fifth cross member 8E in the second embodiment are the same as those in the first embodiment.

[0031] In the second embodiment, the first horizontal member 8A, the second horizontal member 8B, and the third horizontal member 8C are arranged in the height range of H / 3 and H / 2 from the bottom end, and the fourth horizontal member 8D and the fifth horizontal member 8E are provided above the height H / 2 from the bottom end and below the height H / 4 from the top end. In the second embodiment, all of the multiple horizontal members (the first horizontal member 8A, the second horizontal member 8B, the third horizontal member 8C, the fourth horizontal member 8D, and the fifth horizontal member 8E) are arranged between the height H / 3 from the bottom end and the height H / 4 from the top end.

[0032] Based on the model in Fig. 10, the maximum deflection of the door body 2 was calculated for the second embodiment (Fig. 5) and the comparative example in Fig. 11, and it was confirmed that the deflection amount of the framework according to the second embodiment is smaller than that of the framework in which five horizontal members 8 are arranged at equal intervals over the height H. It was also confirmed that the deflection amount of the framework according to the second embodiment is smaller than that of the framework according to the first embodiment.

[0033] [B-4-3] Third embodiment (FIG. 5A) The third embodiment (FIG. 5A) shows an example in which four horizontal members 8 (first horizontal member 8A, second horizontal member 8B, third horizontal member C, and fourth horizontal member 8E) are provided. In FIG. 5A, in a door body 2 having a height dimension H (H=2400 mm), the first horizontal member 8A is provided horizontally at a height position H / 3 from the bottom end of the door body 2, and the second horizontal member 8B is provided horizontally at a height position H / 2 from the bottom end of the door body 2. A third horizontal member 8C is provided horizontally in the door body 2, positioned at the center in the height direction between the first horizontal member 8A and the second horizontal member 8B. The third horizontal member 8C is provided 200 mm below the second horizontal member 8B. A fifth horizontal member 8E is provided horizontally in the door body 2, positioned h2 (h2=500 mm) above the second horizontal member 8B. The positions of the first cross member 8A, the second cross member 8B, the third cross member 8C, and the fourth cross member 8E in the third embodiment are the same as the positions of the first cross member 8A, the second cross member 8B, the third cross member 8C, and the fifth cross member 8E in the second embodiment.

[0034] In the third embodiment, the first cross member 8A, the second cross member 8B, and the third cross member 8C are arranged in the height range of H / 3 and H / 2 from the bottom end, and the fifth cross member 8E is provided above the height H / 2 from the bottom end and below the height H / 4 from the top end. In the third embodiment, all of the multiple cross members (the first cross member 8A, the second cross member 8B, the third cross member 8C, and the fifth cross member 8E) are arranged between the height H / 3 from the bottom end and the height H / 4 from the top end.

[0035] Based on the model in Figure 10, a comparative calculation was made of the maximum deflection of the door body 2, and it was confirmed that the deflection of the frame of the third embodiment is smaller than that of the frame in which four horizontal members 8 are arranged at equal intervals over the height H.

[0036] [B-4-4] Fourth embodiment (Fig. 6) The fourth embodiment (FIG. 6) shows an example in which three horizontal members 8 are provided. The first horizontal member 8A is provided at a height position of H / 3 from the bottom end of the door body 2, and the second horizontal member 8B is provided at a height position of H / 2 from the bottom end of the door body 2. In the door body 2 having a height dimension H (H=2400 mm), a third horizontal member 8E' is provided at a position h2 (h2=400 mm) above the second horizontal member 8B.

[0037] In the fourth embodiment, the first horizontal member 8A and the second horizontal member 8B are arranged between heights H / 3 and H / 2 from the bottom end, and the third horizontal member 8E' is located above height H / 2 from the bottom end and below height H / 4 from the top end. In the fourth embodiment, all of the horizontal members (the first horizontal member 8A, the second horizontal member 8B, and the third horizontal member 8E') are arranged between height H / 3 from the bottom end and height H / 4 (H / 3) from the top end. Note that in the fourth embodiment, the three horizontal members 8 are arranged offset toward the middle of the height direction at height H, which differs from the arrangement in which the horizontal members are arranged at equal intervals throughout the height H (the technical concept differs from that of the comparative example shown in FIG. 11). Numerical calculations confirmed that the deflection amount in the fourth embodiment is smaller than that in the case where the door body 2 is provided with three horizontal members: 8A (height H / 3 from the bottom end), 8B (height H / 2 from the bottom end), and 8E (h2 = 500 mm). Furthermore, in a comparative calculation of the maximum deflection of the door body 2, it was confirmed that the deflection was smaller in the case where "the door body 2 is provided with three horizontal members 8A (height H / 3 from the bottom end), 8B (height H / 2 from the bottom end), and 8E (h2=500mm)" and in the frame of the fourth embodiment, compared to the case where three horizontal members 8 are arranged at equal intervals over the height H.

[0038] [B-4-5] Fifth embodiment (Fig. 7) The fifth embodiment (FIG. 7) shows an example in which two horizontal members 8 are provided. The second horizontal member 8B is provided at a height of H / 2 from the bottom end of the door body 2. The first horizontal member 8A' is located above a height of H / 3 from the bottom end of the door body 2.

[0039] In the fifth embodiment, the first horizontal member 8A' and the second horizontal member 8B are arranged in the height range of H / 3 and H / 2 from the bottom end. It has been confirmed by numerical calculation that the amount of deflection is smaller in the fifth embodiment than when the door body 2 is provided with two horizontal members 8A (at a height of H / 3 from the bottom end) and 8B (at a height of H / 2 from the bottom end).

[0040] [B-5] Horizontal member attachment structure in the frame The horizontal member 8 is positioned horizontally at approximately the center of the framework in the projection direction. In this embodiment, the cross-sectional shape of the horizontal member 8 is not limited, and may be, for example, a cylindrical member or a rectangular columnar member. Alternatively, the horizontal member 8 may be formed from a long member that is U-shaped in cross section, like the ribs 7. The horizontal member 8 is fixed to the vertical frames (the trailing edge vertical frame 6, the leading edge vertical frame or the rib 7 located closest to the leading edge) while passing through the vertical frames (ribs 7).

[0041] In the embodiment shown in Figure 2, the cross member 8 is a circular pipe, and a circular insertion hole is formed at a predetermined height position on the projected edge 70 of the rib 7, and with the cross member 8 inserted through the insertion hole on the projected edge 70 of the rib 7, the peripheral surface of the cross member 8 is appropriately welded to the insertion hole. Circular holes are formed at predetermined heights on the projected edge 50 of the leading-end vertical frame 5 and the projected edge 60 of the trailing-end vertical frame 6, and the end of the cross member 8 on the leading-end side in the lengthwise direction is received in and fixed (welded) to the hole formed in the projected edge 50, and the end of the cross member 8 on the trailing-end side in the lengthwise direction is received in and fixed (welded) to the hole formed in the projected edge 60.

[0042] In the embodiment shown in Figure 8, a square plate 80 is prepared in which an insertion hole for a cross member 8 is formed, and the projected dimensions of the square plate 80 are approximately the same as the projected dimensions of the inner surface of the projected edge 70. A square notch corresponding to the square plate 80 is formed at a predetermined height position on the projected edge 70 of the backbone 7, and the square plate 80 is fixed to the notch in the projected edge 70. The cross member 8 passes through the square plate 80 fixed (welded) to the backbone 7. Note that when the backbone 7 is bent and shaped, if the plate body is bent to form the pair of projected edges 71, 72 after forming the circular insertion hole, there is a risk that the circular insertion hole will be deformed during bending; the configuration shown in Figure 8 can solve this problem.

[0043] In the embodiment shown in Figure 9, the cross members 8', 8" are square pipes, and square insertion holes are formed in the projected side 70 of the backbone 7 at a predetermined height position. The cross members 8', 8" are inserted through the insertion holes in the projected side 70 of the backbone 7 and welded appropriately. In the embodiment shown on the left in Figure 9, the projected width of the cross member 8' is smaller than the projected width of the projected side 70, and the cross member 8' is fixed by welding the contact areas between the circumferential surface of the square pipe and the insertion holes. In the embodiment shown on the right in Figure 9, the projected width of the cross member 8" is approximately the same as the projected width of the inner surface of the projected side 70, and the cross member 8" is fixed by welding the contact areas between the circumferential surface of the square pipe and the pair of projected sides 71, 72. [Explanation of symbols]

[0044] 2 Door body 3 Upper frame (horizontal frame) 4 Bottom frame (horizontal frame) 5. Door end vertical frame (vertical frame) 6 Door end side vertical frame (vertical frame) 7. Backbone (vertical frame) 8, 8A~8E, 8A´, 8E´, 8´, 8´´ Horizontal material 9A, 9B Surface material H Door body height

Claims

1. A framework consisting of a horizontal frame consisting of an upper frame and a lower frame, and a vertical frame consisting of a door end vertical frame, a door end vertical frame, and multiple central ribs; A surface material attached to the framework, and a door body having a height dimension H, The frame has a plurality of horizontal members in the height range of H / 3 and H / 2 from the lower end. Door body.

2. The framework further includes one or more horizontal members positioned above a central height of H / 2 from the bottom end and below a height of H / 4 from the top end. The door body according to claim 1 .

3. The one or more horizontal members are provided in a height range from the central height to a position 500 mm above the central height. The door body according to claim 2.

4. The framework is provided with a plurality of cross members positioned near the central height. The door body according to claim 1 .

5. The plurality of cross members provided near the central height are provided near the upper side and / or the lower side of the central height. The door body according to claim 4.

6. All of the horizontal members are arranged in the frame between a height of H / 3 from the lower end and a height of H / 4 from the upper end. The door body according to any one of claims 1 to 5.

7. The horizontal member is fixed to the vertical frame in a state where it is inserted through the vertical frame. The door body according to any one of claims 1 to 5.

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