Water-resistant door structure

Abstract

To improve water pressure resistant performance of a door frame formed by multiple members.SOLUTION: A sill 3 is formed by a first member 33 and a second member 34. A first surface of a recess groove 322 of the sill 3 comprises an indoor side part of a first side 330 of the first member 33, a second surface of the recess groove 322 comprises a second side 341 of the second member 34, a bottom surface of the recess groove 322 is formed by a third side 342 of the second member 34, a second side 331 of the first member 33 is welded in an abutted state onto a back surface of the third side 342 of the second member 34 forming the bottom surface of the recess groove 322 and a bottom surface part of the recess groove 322 comprises an overlapping part obtained by welding the second side 331 of the first member 33 and the third side 342 of the second member 34 in the abutted state.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a water pressure resistant structure for a door device. [Background technology]

[0002] The recent frequent occurrence of sudden downpours has raised awareness of urban disaster prevention, leading to an increasing demand for waterproof doors as a flood prevention measure for building openings. While conventional waterproof structures are generally designed assuming a flood height of 2 meters, there are cases where a waterproof structure that can withstand higher flood heights (e.g., 3 meters) is required. Since the pressure acting on a door body in a fully closed position increases in proportion to the flood height, conventional waterproof structures designed assuming a flood height of 2 meters may experience excessive deformation of the door device's components or damage to the connections of the components when subjected to the water pressure of a flood height of 3 meters.

[0003] When water pressure acts on the outdoor portion of a door device in a fully closed position, the water pressure also acts on the door frame through the door body. Some conventional door frame bottoms (sills) are formed by welding multiple parts together (see Patent Document 1, Figure 3, etc.), and when high water pressure (for example, water pressure from a flood height of 3 meters) acts on the bottom frame, a large force acts on the joints, which can cause the bottom frame to break.

[0004] 12, a conventional lower frame is comprised of a first member having a first side a1 extending in the indoor / outdoor direction, a second side a2 rising vertically from the outdoor end of the first side a1, and a third side a3 extending horizontally from the upper end of the second side a2 to the indoor side, and a second member having a horizontal folded-back bent portion b on the outdoor side, and the lower frame is formed by plug welding the upper surface of the third side a3 of the first member to the lower surface of the folded-back bent portion b of the second member. A U-shaped recessed groove (pocket portion) is formed in cross section by the first side a1, the second side a2 of the first member, and the outdoor-facing part of the folded-back bent portion b of the second member, and a watertight member is attached to the pocket portion. When water pressure acts on the door body in the fully closed position of the opening, the door body presses against the watertight member and displaces toward the indoor side, abutting against the tip of the folded-back bent portion b of the second member, and a force is applied that presses the folded-back bent portion b toward the indoor side.

[0005] The first and second members are structured in such a way that their shear strength depends on the plug weld between the horizontally extending members (the third side a3 of the first member and the folded bend b of the second member). However, when water pressure acts on the lower frame, the force acts in a direction that shifts the third side a3 of the first member and the folded bend b of the second member. Therefore, when large water pressure (for example, water pressure at a flood height of 3m) acts on the lower frame, it must be avoided that a large force acts on the connection and the lower frame is damaged. [Patent Document 1] Patent Publication No. 2021-050562 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION An object of the present invention is to improve the water pressure resistance of a door frame formed from multiple components. [Means for solving the problem]

[0007] The technical means adopted by the present invention are: A water-resistant structure of a door device in which a door body closes an opening formed by a four-perimeter frame, The four-sided frame includes a first surface portion to which the end surface of the door body faces when the opening is fully closed, a second surface portion located on the indoor side of the first surface portion, and a recessed groove located between the indoor side portion of the first surface portion and the outdoor side portion of the second surface portion, formed to open to the outdoor side, and having a watertight member attached around the four sides thereof; The groove includes a first surface and a second surface facing each other and a bottom surface, At least one of the four peripheral frames is formed from a first member that forms the first surface portion and a second member that forms the second surface portion, The first member includes a first side that forms the first surface and an indoor support side (second sides 331, 331′, fourth sides 233, 233′) that is located on the indoor side of the bottom surface of the recessed groove, the second member includes a first side that forms the second surface, a second side that overlaps with an inner surface of an outdoor-side portion of the first side to form a folded-back portion, and a third side that extends outward from an indoor-side end portion of the second side, The first surface of the recessed groove is made up of a portion of the first member (the indoor side portion of the first side 330 and the outdoor side portion of the third side 232), the second surface of the recessed groove is formed by the second side of the second member, the bottom surface of the recessed groove is formed by the third side of the second member, The third side of the second member is supported directly or indirectly from the indoor side by the indoor side support side of the first member. The door device has a water-resistant structure. In one embodiment, the first surface of the recessed groove is formed from an indoor side portion of the first side of the first member.

[0008] In one aspect, the indoor side support edge of the first member is an edge that extends inward from the indoor side end of the first surface of the recessed groove, The indoor side support edge is welded to the rear surface of the third edge of the second member in a state of contact with the rear surface from the indoor side. By improving the configuration of the upper frame 2' of the second embodiment described later (configuration without the third member 25), the fourth side 233' may be made to function as the indoor side support side (see Figure 11). In one embodiment, the indoor side support edge of the first member is a second edge extending inward from an indoor side end of the first edge, The second side of the first member is welded to the rear surface of the third side of the second member in a state of contact with the rear surface from the indoor side.

[0009] In one embodiment, the at least one frame is a lower frame; the first member includes a first side that forms the first surface and a second side that rises perpendicularly from an indoor side end of the first side, the second member includes a horizontal first side that forms the second surface, a horizontal second side that overlaps with a lower surface of an outdoor-side portion of the first side to form a horizontal folded-back portion, and a third side that hangs down from an indoor-side end portion of the second side, The second side of the first member is welded in contact with the back surface of the third side of the second member, which forms the bottom surface of the recessed groove.

[0010] In one embodiment, the indoor side support edge of the first member faces the indoor side of the third edge of the second member at a distance, a third member is provided between the indoor side support edge of the first member and the third edge of the second member, The third member is welded to the first member and the second member.

[0011] In one embodiment, the first member includes a third side (third side 332, 332′, fifth side 234, 234′) extending from an end of the indoor side support side toward the indoor side, The third side of the first member abuts against the inner surface of the first side of the second member. In one embodiment, the indoor side support edge of the first member is a second edge extending inward from an indoor side end of the first edge, and the first member includes a third edge extending inward from an end of the second edge, The third side of the first member abuts against the inner surface of the first side of the second member at a portion adjacent to the folded-back portion.

[0012] The technical means adopted by the present invention are: The lower frame of the door device includes a first surface portion to which the lower end portion of the door body faces when the opening is fully closed, a second surface portion located on the indoor side of the first surface portion, and a recessed groove formed between the indoor side portion of the first surface portion and the outdoor side portion of the second surface portion, opening to the outdoor side, and fitted with a watertight member; the lower frame includes a first member including the first surface portion and a second member including the second surface portion, the first member includes a first side that forms the first surface portion and a second side that rises perpendicularly from an indoor side end of the first side, the second member includes a horizontal first side that forms the second surface portion, a horizontal second side that overlaps with a lower surface of an outdoor-side portion of the first side to form a horizontal folded-back portion, and a third side that hangs down from an indoor-side end portion of the second side, The groove includes a first surface on the lower side and a second surface on the upper side that face each other, and a bottom surface that is a vertical surface, the first surface of the recessed groove is formed from an indoor portion of the first side of the first member, the second surface of the recessed groove is formed by the second side of the second member, the bottom surface of the recessed groove is formed from the third side of the second member, The second side of the first member is welded in a state in which it abuts against the back surface of the third side of the second member that forms the bottom surface of the recessed groove. The door device has a water-resistant structure. In one embodiment, the first member includes a third side extending horizontally from an end of the second side toward the indoor side, The third side of the first member abuts against the lower surface of the first side of the second member at a portion adjacent to the folded-back portion. [Effects of the Invention]

[0013] In the present invention, in a door frame made up of multiple connected components, the bottom surface of the groove into which the watertight component is attached is made up of part of one component, and the bottom surface of the groove is supported from the indoor side by the indoor side support edge of another component, thereby resisting water pressure acting from the outdoor side. Furthermore, when the bottom surface of the groove is welded with two sides abutting, the force acting on the bottom surface of the groove acts in a direction that maintains the abutting state of the two sides (a direction perpendicular to the direction in which the welded portion is peeled off), thereby improving the water pressure resistance of the door frame made up of multiple connected components. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a front view of a door device (fully closed state) according to a first embodiment, as viewed from the outdoor side. [Figure 2] 1 is a cross-sectional view of a door device (fully closed state) according to a first embodiment. [Figure 3] 1 is a vertical cross-sectional view of a door device (fully closed state) according to a first embodiment. [Figure 4] FIG. 4 is a partial enlarged view of the lower part of FIG. 3. [Figure 5] FIG. 10 is a front view of a door device (fully closed state) according to a second embodiment, as viewed from the outdoor side. [Figure 6] FIG. 10 is a cross-sectional view of a door device (fully closed state) according to a second embodiment. [Figure 7] FIG. 10 is a vertical cross-sectional view of a door device (fully closed state) according to a second embodiment. [Figure 8] FIG. 8 is a partial enlarged view of the upper portion of FIG. 7. [Figure 9] A diagram explaining the function of the water-resistant structure of the lower frame in this embodiment. [Figure 10] 1 shows a modified example of a lower frame with a water pressure resistant structure. [Figure 11] A modified example of an upper frame with a water pressure resistant structure is shown. [Figure 12] 10A and 10B are diagrams illustrating the case where water pressure acts on a conventional lower frame. [Figure 13] A figure showing an embodiment of a reinforcing structure for a lower frame using a connecting member. [Figure 14] 14 is a view similar to FIG. 13, showing another embodiment of the connecting member. [Figure 15] 10A and 10B are schematic diagrams illustrating deformation of the lower frame that may occur when a large water pressure acts on the lower frame. DETAILED DESCRIPTION OF THE INVENTION

[0015] Embodiments of the present invention will be described with reference to the drawings. This specification discloses two embodiments: a first embodiment (FIGS. 1 to 4) relating to a single-swing door, and a second embodiment (FIGS. 5 to 8) relating to a double-swing door. FIG. 1 is a front view of a door device (fully closed state) according to the first embodiment, as viewed from the outdoor side. FIGS. 2 and 3 are a cross-sectional view and a vertical cross-sectional view, respectively, of the door device (fully closed state) according to the first embodiment, and FIG. 4 is a partially enlarged view of the lower portion of FIG. 3. FIG. 5 is a front view of a door device (fully closed state) according to a second embodiment, as viewed from the outdoor side. FIGS. 6 and 7 are a cross-sectional view and a vertical cross-sectional view, respectively, of the door device (fully closed state) according to the second embodiment, and FIG. 8 is a partially enlarged view of the upper portion of FIG. 7. In FIGS. 2 and 6, the lower side is the outdoor side and the upper side is the indoor side. In FIGS. 3 and 7, the left side is the outdoor side and the right side is the indoor side. In FIGS. 2 to 4 and 6 to 8, arrows indicate the direction of water pressure load.

[0016] The waterproof structure according to this embodiment is designed to prevent water generated on the outdoor side from seeping into the indoor side. In this specification, the terms "outdoor side" and "indoor side" are used not only to define when an element is actually located on the outdoor side or indoor side, but also to define a portion or part of an element, such as the portion of an element that is actually located on the indoor side that is closest to the outdoor side. It should also be noted that in this specification, the side of a door frame element that forms the perimeter of an opening is sometimes referred to as the "inside" side, while the side farthest from the opening is sometimes referred to as the "outside" side.

[0017] [A] First embodiment The door device shown in Figure 1 is a single-leaf door equipped with a door body 1 that opens and closes a building opening formed by a door frame, and the building opening is opened by rotating the door body 1 from a closed position toward the outdoors. The door frame is formed into a four-way frame shape consisting of a horizontally extending upper frame 2, a horizontally extending lower frame (sill) 3, a vertically extending leading edge frame 4, and a vertically extending trailing edge frame 5. The trailing edge portion of the door body 1 is rotatably attached to the trailing edge frame 5.

[0018] The door body 1 has a vertically rectangular outdoor side portion 10, a vertically rectangular indoor side portion 11, an upper end surface 12, a lower end portion 13, a leading end surface 14, and a trailing end surface 15. The trailing end side of the outdoor side portion 10 of the door body 1 is rotatably attached to the trailing end vertical frame 5 of the door frame by a hinge 16. The hinge 16 in this embodiment is a so-called biaxial hinge, which can push the door body 1 in a closed state toward the indoor side (by water pressure or pressing means). When the door body 1 is pushed in a normal closed position, the periphery of the indoor side portion 11 of the door body 1 is tightly fitted with a watertight member 18, thereby achieving a watertight structure. Handles H used to open and close the door body 1 are attached to the leading end sides of the outdoor side portion 10 and the indoor side portion 11 of the door body 1.

[0019] The door body 1 is composed of a structure made of framework, i.e., a frame, and a surface material attached to the structure. The structure of the door body 1 is made up of a four-sided frame consisting of an upper frame 6, a lower frame 7, a leading vertical frame 8, and a trailing vertical frame 9, as well as multiple intermediate vertical frames 17 arranged side by side at intervals across the width of the door body 1. The structure and surface material in this embodiment are made of steel.

[0020] As shown in Figures 2 and 3, the upper frame 6 is a long member extending horizontally in the width direction of the door body 1 and is composed of an upper surface 60, an outdoor facing surface 61, and an indoor facing surface 62. The lower frame 7 is a long member extending horizontally in the width direction of the door body 1 and is composed of an upper surface 70, an outdoor facing surface 71, and an indoor facing surface 72. The leading edge vertical frame 8 is a long member extending perpendicular to the height direction of the door body 1 and is composed of a leading edge facing surface 80, an outdoor facing surface 81, and an indoor facing surface 82. The trailing edge vertical frame 9 is a long member extending perpendicular to the height direction of the door body 1 and is composed of a trailing edge facing surface 90, an outdoor facing surface 91, and an indoor facing surface 92.

[0021] As shown in Figures 2 and 3, the intermediate vertical frame 17 is a long member extending perpendicular to the height of the door body 1 and includes a front surface 170, an exterior-facing surface 171, and an interior-facing surface 172. In this embodiment, the front surfaces 170 of two intermediate vertical frames 17 are abutted against each other (in one embodiment, they are fixed by welding), forming a rib consisting of a pair of intermediate vertical frames 17. Conventionally, the strength of a door body has been improved by arranging ribs, each of which is a U-shaped member in cross section, at regular intervals in the width direction. However, the rib structure of conventional waterproof doors is designed for flooding heights of 2 meters. If a door in a fully closed position is subjected to water pressure of a flood height of 3 meters, the door may deform, bulging significantly toward the interior, potentially making it unable to maintain its hydraulic structure. In this embodiment, the rib is formed from a pair of intermediate vertical frames 17 abutting against each other at their front surfaces 170, thereby improving the rigidity, i.e., strength, of the door body 1.

[0022] As shown in Figures 2 and 3, the surface material of the door body 1 is composed of a first surface material that forms the outdoor side surface portion 10, the outdoor half of the upper end surface 12, the outdoor half of the leading end surface 14, and the outdoor half of the trailing end surface 15, and a second surface material that forms the indoor side surface portion 11, the indoor half of the upper end surface 12, the indoor half of the leading end surface 14, and the indoor half of the trailing end surface 15. The first and second surface materials in this embodiment are U-shaped in cross section and inverted L-shaped in vertical section.

[0023] The first surface material is fixed (by welding or adhesive) to the outdoor facing surface 61 of the upper frame 6, the outdoor half of the top surface 60, the outdoor facing surface 71 of the lower frame 7, the outdoor facing surface 81 of the leading vertical frame 8, the outdoor half of the leading facing surface 80, the outdoor facing surface 91 of the trailing vertical frame 9, and the outdoor half of the trailing vertical face 90. The second surface material is fixed (by welding or adhesive) to the indoor facing surface 62 of the upper frame 6, the indoor half of the top surface 60, the indoor facing surface 72 of the lower frame 7, the indoor facing surface 82 of the leading vertical frame 8, the indoor half of the leading facing surface 80, the indoor facing surface 92 of the trailing vertical frame 9, and the indoor half of the trailing vertical face 90.

[0024] The structure of the door frame according to this embodiment will be described in detail. The door frame is formed into a four-sided frame shape by connecting (typically by welding) both longitudinal ends of the horizontally extending upper frame 2 to the upper ends of the vertically extending front-end vertical frame 4 and the vertically extending rear-end vertical frame 5, and connecting (typically by welding) both longitudinal ends of the horizontally extending lower frame 3 to the lower ends of the vertically extending front-end vertical frame 4 and the vertically extending rear-end vertical frame 5. According to this embodiment, the upper frame 2 and the left and right vertical frames 4 and 5 are made of steel, and the lower frame 3 is made of stainless steel, but this is not a limitation.

[0025] As shown in Figure 3, the upper frame 2 includes an outdoor-side facing portion 20, an indoor-side facing portion 21, and a bottom portion 22. The bottom portion 22 is made up of a horizontal outdoor side portion 220, a horizontal indoor side portion 221, and a groove 222 that opens to the outdoor side. In the illustrated embodiment, the upper frame 2, which includes the outdoor-side facing portion 20, the indoor-side facing portion 21, and the bottom portion 22 (including the groove 222), is obtained by bending a single member into a predetermined shape. The height position of the outdoor side portion 220 is higher than the height position of the indoor side portion 221, and the indoor-side portion of the outdoor side portion 220 and the outdoor-side portion of the indoor side portion 221 face each other in a stepped manner, with the groove 222 formed between the indoor-side portion of the outdoor side portion 220 and the outdoor-side portion of the indoor side portion 221. A long watertight member (watertight rubber) 18 is attached to a recessed groove 222 extending horizontally in the width direction of the building opening.

[0026] As shown in FIG. 3 , the lower frame 3 includes an outdoor-side facing portion 30, an indoor-side facing portion 31, and an upper surface portion 32. The upper surface portion 32 includes an inclined outdoor side surface portion 320, a horizontal indoor side surface portion 321, and a groove 322 that opens to the outdoor side. In the illustrated embodiment, the lower frame 3, including the outdoor-side facing portion 30, the indoor-side facing portion 31, and the upper surface portion 32 (including the groove 322), is obtained by connecting a first member 33 and a second member 34 that are formed by bending into a predetermined shape. The configurations of the first member 33 and the second member 34 will be described later. The height position of the outdoor-side portion 320 is lower than the height position of the indoor-side portion 321, and the indoor-side portion of the outdoor-side portion 320 and the outdoor-side portion of the indoor-side portion 321 face each other in a stepped manner, with a groove 322 formed between them. A long watertight member (watertight rubber) 18 is attached to a recessed groove 322 extending in the width direction of the building opening.

[0027] As shown in Figure 2, the leading-door vertical frame 4 includes an outdoor-side facing portion 40, an indoor-side facing portion 41, and a visible surface portion 42. The visible surface portion 42 is composed of a vertically extending outdoor side portion 420, a vertically extending indoor side portion 421, and a recessed groove 422 that opens to the outdoor side. In the illustrated embodiment, the leading-door vertical frame 4, including the outdoor-side facing portion 40, the indoor-side facing portion 41, and the visible surface portion 42 (including the recessed groove 422), is obtained by bending and forming a single member into a predetermined shape. The outdoor side portion 420 is located outside the indoor side portion 421, and the indoor-side portion of the outdoor side portion 420 and the outdoor-side portion of the indoor side portion 421 face each other in a stepped manner, with the recessed groove 422 formed between them. A long watertight member (watertight rubber) 18 is attached to a recessed groove 422 extending in the height direction of the building opening.

[0028] As shown in FIG. 2, the trailing edge vertical frame 5 includes an outdoor-side facing portion 50, an indoor-side facing portion 51, and a visible surface portion 52. The visible surface portion 52 is composed of a vertically extending outdoor side portion 520, a vertically extending indoor side portion 521, and a recessed groove 522 that opens to the outdoor side. In the illustrated embodiment, the trailing edge vertical frame 5, including the outdoor-side facing portion 50, the indoor-side facing portion 51, and the visible surface portion 52 (including the recessed groove 522), is obtained by bending and forming a single member into a predetermined shape. The outdoor side portion 520 is located outside the indoor side portion 521, and the indoor-side portion of the outdoor side portion 520 and the outdoor-side portion of the indoor side portion 521 face each other in a stepped manner, with the recessed groove 522 formed between the indoor-side portion of the outdoor side portion 520 and the outdoor-side portion of the indoor side portion 521. A long watertight member (watertight rubber) 18 is attached to a recessed groove 522 extending in the height direction of the building opening.

[0029] The grooves 222, 322, 422, 522 formed in the door frame form a U-shaped pocket in cross section, consisting of an inner portion (the folded portion of the outdoor side of the indoor side portion 221, 321, 421, 521), an outer portion (the indoor side of the outdoor side portion 220, 320, 420, 520), and a bottom portion, and the inner surface of the grooves 222, 322, 422, 522, i.e., the pocket, consists of a first surface of the inner surface of the outer portion, a second surface of the inner surface of the inner portion, and a bottom surface of the inner surface of the bottom portion. The groove 222 formed in the upper frame 2, the groove 322 formed in the lower frame 3, the groove 422 formed in the vertical frame 4 on the leading edge side, and the groove 522 formed in the vertical frame 5 on the trailing edge side are continuous all around when viewed from the front from the outside, and the watertight members 18 attached to the grooves 222, 322, 422, 522 are continuous all around.

[0030] The watertight member 18 consists of a base 180 that fits into the grooves 222, 322, 422, 522, and a contacted portion 181 that comes into contact with the door body 1 when in the fully closed position (see Figure 4). When the watertight member 18 is attached to the grooves 222, 322, 422, 522, the contacted portion 181 of the watertight member 18 (reference number 181 is shown as a representative in Figure 4) is located outside of the outdoor ends of the inner parts of the grooves 222, 322, 422, 522 (the outdoor end of the indoor side portion 221 of the upper frame 2, the outdoor end of the indoor side portion 321 of the lower frame 3, the outdoor end of the indoor side portion 421 of the front vertical frame 4, and the outdoor end of the indoor side portion 521 of the rear vertical frame 5). In other words, the watertight member 18 has a portion (contacted portion 181) located on the outdoor side of the grooves 222, 322, 422, and 522, and when the opening is fully closed, the four peripheral edges of the indoor side portion 11 of the door body 1 come into contact with this portion.

[0031] When the door body 1 is in the fully closed position, the upper end surface 12 of the door body 1 faces the outdoor side surface 220 of the upper frame 2 at a distance, the upper end portion of the indoor side surface 11 of the door body 1 abuts the watertight member 18, the lower end surface 13 of the door body 1 faces the outdoor side surface 320 of the lower frame 3 at a distance, the lower end portion of the indoor side surface 11 of the door body 1 abuts the watertight member 18, the leading end surface 14 of the door body 1 faces the outdoor side surface 420 of the leading vertical frame 4 at a distance, the leading side portion of the indoor side surface 11 of the door body 1 abuts the watertight member 18, the trailing end surface 15 of the door body 1 faces the outdoor side surface 520 of the trailing vertical frame 5 at a distance, the leading side portion of the indoor side surface 11 of the door body 1 abuts the watertight member 18, and a four-way waterproof structure is formed around the door body 1. The watertight member 18 also functions as a buffer member that prevents the door body 1 and the door frame from directly contacting each other. When water pressure acts, the door body 1 in the fully closed position is pushed toward the indoor side, and the four peripheral parts of the indoor side part 11 of the door body 1 are pressed against the watertight member 18, maintaining the waterproof structure.

[0032] The configuration of the lower frame 3 according to this embodiment will be described in detail with reference to Figure 4. The lower frame 3 is made by bending a stainless steel plate into a predetermined shape and is composed of a long first member 33 extending in the width direction of the opening, and a long second member 34 also formed by bending a stainless steel plate into a predetermined shape and extending in the width direction of the opening. The first member 33 has a portion that forms the outdoor side surface 320 and outdoor facing portion 30 of the upper surface 32 of the lower frame 3, and the second member 34 has a portion that forms the indoor side surface 321 and indoor facing portion 31 of the upper surface 32 of the lower frame 3.

[0033] As shown in Figure 4, the first member 33 comprises a first side 330 that extends sloping upward from the outdoor side toward the indoor side, a second side 331 that rises vertically from the indoor side end of the first side 330, a third side 332 that extends horizontally from the upper end of the second side 331 toward the indoor side, a fourth side 333 that hangs down from the outdoor side end of the first side 330, a fifth side 334 that extends horizontally from the lower end of the fourth side 333 toward the indoor side, and a sixth side 335 that hangs down from the indoor side end of the fifth side 334. The first side 330 of the first member 33 forms the outdoor side surface portion 320 of the upper surface portion 32 of the lower frame 3, and the fourth side 333 of the first member 33 forms the outdoor facing portion 30 of the lower frame 3.

[0034] As shown in Figure 4, the second member 34 comprises a horizontally extending first side 340, a horizontal second side 341 that overlaps the inner surface of the outdoor portion of the first side 340 to form a folded portion, a third side 342 that hangs down from the indoor end of the second side 341, and a fourth side 343 that hangs down from the indoor end of the first side 340. The first side 340 of the second member 34 forms the indoor side portion 321 of the upper surface 32 of the lower frame 3, and the fourth side 343 of the second member 34 forms the indoor facing portion 31 of the lower frame 3. The folded portion formed by the outdoor portion of the first side 340 and the second side 341 is formed, for example, by hemming.

[0035] The groove 322 is formed of an upper portion (inner portion), a lower portion (outer portion), and a bottom portion, and the upper portion of the groove 322 is formed from the folded-back portion of the second member 34, with the second side 341 of the second member 34 forming the inner surface of the upper portion. The lower portion of the groove 322 is formed from the indoor side portion of the first side 330 of the first member 33.

[0036] The bottom surface of the recessed groove 322 consists of an overlapping portion formed by welding (plug welding) the second side 331 of the first member 33 and the third side 342 of the second member 34 in an abutting state, and at the overlapping portion, the third side 342 of the second member 34 is located on the outdoor side and forms the inner surface of the bottom surface, and the second side 331 of the first member 33 is located on the indoor side and abuts against the back surface (indoor surface) of the third side 342 of the second member 34. The third side 332 of the first member 33 abuts (may be welded) against the underside of a portion of the first side 340 of the second member 34 that is adjacent to the folded-back portion.

[0037] As described above, the first embodiment is a water-resistant structure of a door device in which a door body 1 closes an opening formed by four surrounding frames (an upper frame 2, a lower frame 3, a door-leading side vertical frame 4, and a door-trailing side vertical frame 5), The four-perimeter frame includes a first surface portion (outdoor side surface portion 220, 320, 420, 520) that faces the end surface of the door body when the opening is fully closed, a second surface portion (indoor side surface portion 221, 321, 421, 521) that is located on the indoor side of the first surface portion, and grooves 222, 322, 422, 522 that are located between the indoor side portion of the first surface portion and the outdoor side portion of the second surface portion, are formed to open to the outdoor side, and have watertight members fitted around the four perimeter, The lower frame 3 of the four-perimeter frame is formed from a first member 33 that forms a first surface portion (outdoor side surface portion 320) and a second member 34 that forms a horizontal second surface portion (indoor side surface portion 321), The first member 33 includes a first side 330 that forms a first surface portion (outdoor side surface portion 320), a second side 331 that rises vertically from the indoor side end portion of the first side 330, and a third side 332 that extends horizontally from the upper end of the second side 331 toward the indoor side, The second member 34 includes a horizontal first side 340 that forms a second surface portion (indoor side surface portion 321), a horizontal second side 341 that overlaps with the underside of the outdoor side portion of the first side 340 to form a horizontal folded portion, and a third side 342 that hangs down from the indoor side end portion of the second side 341, The groove 322 is made up of a first surface on the lower side, a second surface on the upper side, and a bottom surface that is a vertical surface, The first surface of the recessed groove 322 is formed by the indoor side portion of the first side 330 of the first member 33, The second surface of the recessed groove 322 is formed by the second side 341 of the second member 34, The bottom surface of the recessed groove 322 is formed from the third side 342 of the second member 34. The second side 331 of the first member 33 is welded in abutting contact with the back surface of the third side 342 of the second member 34, which forms the bottom surface of the recessed groove 322, and the bottom surface portion of the recessed groove 322 is formed by an overlapping portion formed by welding the second side 331 of the first member 33 and the third side 342 of the second member 34 in abutting contact with each other, The third side 332 of the first member 33 abuts against the underside of a portion of the first side 340 of the second member 34 that is adjacent to the folded-back portion. A water pressure resistant structure for a door device is disclosed.

[0038] [B] Second embodiment A door device according to a second embodiment will be described with reference to FIGS. 5 to 8. The door device according to the second embodiment is a so-called double-door, and is composed of a door frame that forms a building opening and a first door body 1A and a second door body 1B that open and close the building opening. The basic structure of the first door body 1A and the second door body 1B is the same as that of the door body 1 according to the first embodiment. Each door body is composed of a four-sided frame consisting of an upper frame 6, a lower frame 7, a leading-edge vertical frame 8, and a trailing-edge vertical frame 9, a structural body made up of an intermediate vertical frame 17, and a surface material fixed to the structural body. Like the door body 1, the first door body 1A and the second door body 1B have a central rib made up of a pair of intermediate vertical frames 17 whose projected surfaces 170 abut against each other, thereby improving the rigidity, i.e., strength, of the first door body 1A and the second door body 1B.

[0039] The first door body 1A has a vertically rectangular outdoor side surface 10, a vertically rectangular indoor side surface 11, an upper end surface 12, a lower end surface 13, a leading end surface 14A, and a trailing end surface 15. The trailing end side of the outdoor side surface 10 of the first door body 1A is rotatably attached to the first vertical frame (the trailing end vertical frame) 5A of the door frame by a biaxial hinge 16. A cremone handle GH is provided at the lower portions of the outdoor side surface 10 and the indoor side surface 11 of the first door body 1A as a means for pressing the first door body 1A.

[0040] The second door body 1B has a vertically rectangular outdoor side portion 10, a vertically rectangular indoor side portion 11, an upper end surface 12, a lower end portion 13, a leading edge end surface 14B, and a trailing edge end surface 15. The trailing edge side of the outdoor side portion 10 of the second door body 1B is rotatably attached to the second vertical frame (the trailing edge vertical frame) 5B of the door frame by a hinge 16 consisting of a biaxial hinge. A cremone handle GH is provided at the lower portion of the outdoor side portion 10 and the indoor side portion 11 of the second door body 1B as a pressing means for the second door body 1B. A handle H used for opening and closing the second door body 1B is attached to the leading edge side of the outdoor side portion 10 and the indoor side portion 11 of the second door body 1B.

[0041] As shown in Figure 6, when the opening is fully closed, the door edge portion of the first door body 1A and the door edge portion of the second door body 1B form a joint portion. A step portion 140A is formed in the outdoor side portion of the door edge end face 14A of the first door body 1A. A protrusion 140B protruding in the view direction from the door edge end face 14B is formed in the outdoor side portion of the door edge end face 14B of the second door body 1B. When the first door body 1A and the second door body 1B are in the closed position, the door edge end face 14A of the first door body 1A and the door edge end face 14B of the second door body 1B face each other, and the protrusion 140B of the second door body 1B is positioned at the step portion 140A of the first door body 1A.

[0042] The first door body 1A and the second door body 1B are configured to open the building opening by rotating them from a closed position toward the outdoors. Normally, the first door body 1A is in a closed position, closing one width half of the building opening, and the other width half of the building opening is opened or closed by opening or closing the second door body 1B, with the second door body 1B functioning as the parent door or main door and the first door body 1A functioning as the child door or sub door. Also, when necessary, both the first door body 1A and the second door body 1B can be opened to open the entire width of the building opening.

[0043] As shown in Figures 6 and 7, a vertically extending joint member 19 is provided on the leading edge of the interior side surface 11 of the first door body 1A. The joint member 19 is formed in a protruding shape from the leading edge end surface 14A of the first door body 1A in the facing direction (away from the leading edge end surface 14A) and has a groove extending vertically that opens toward the outdoors. A second watertight member 18' (watertight rubber) is attached to the groove throughout its entire height. When the first door body 1A and the second door body 1B are fully closed, the watertight member 18' on the first door body 1A is in close contact with the leading edge of the interior side surface 11 of the second door body 1B. A French stop (denoted by reference number 190) is attached to the joint member 19 as a means for securing the first door body 1A in the closed position.

[0044] As shown in Fig. 5, the door frame according to the second embodiment is formed into a four-sided frame shape by a horizontally extending upper frame 2', a horizontally extending lower frame 3, a vertically extending first vertical frame 5A, and a vertically extending second vertical frame 5B. As shown in Fig. 7, the upper frame 2' includes an outdoor facing portion 20, an indoor facing portion 21, and a bottom surface 22'. The bottom surface 22' includes a horizontal outdoor side surface 220', a horizontal indoor side surface 221', and a recessed groove 222 that opens to the outdoor side. The upper frame 2' according to this embodiment is formed by connecting a first member 23 including the outdoor facing portion 20 and the outdoor side surface 220', a second member 24 including the indoor side surface 21 and the indoor side surface 221', and a third member 25 that is U-shaped in cross section. The first member 23, the second member 24, and the third member 25 are all elongated members extending in the opening width direction.

[0045] As shown in Figure 8, the first member 23 consists of a first side 230 (outdoor side portion 220') extending horizontally, a second side 231 hanging down from the indoor side end of the first side 230, a third side 232 extending horizontally from the lower end of the second side 231 toward the indoor side, a fourth side 233 hanging down from the indoor side end of the third side 232, a fifth side 234 extending horizontally from the lower end of the fourth side 233 toward the indoor side, a sixth side 235 (outdoor side facing portion 20) rising vertically from the outdoor side end of the first side 230, a seventh side 236 extending horizontally from the upper end of the sixth side 235 toward the indoor side, and an eighth side 237 rising vertically from the indoor side end of the seventh side 236.

[0046] As shown in Figure 8, the second member 24 consists of a first side 240 (indoor side portion 221') extending horizontally, a horizontal second side 241 that overlaps with the inner surface (top surface) of the outdoor portion of the first side 240 to form a folded portion, a third side 242 that rises vertically from the indoor side end of the second side 241, a fourth side 243 (indoor side visible portion 21) that rises vertically from the indoor side end of the first side 240, and a fifth side 244 that extends horizontally from the upper end of the fourth side 243 toward the outdoor side.

[0047] The fifth side 234 of the first member 23 abuts against the inner surface (top surface) of the first side 240 of the second member 24 and is connected by plug welding, and in this state, the second side 231 of the first member 23 and the tip of the folded-back portion of the second member 24 (the tip of the first side 240) are located on the same vertical plane, the second side 241 of the second member 24 faces the outdoor-side portion of the third side 232 of the first member 23 at a distance, and the upper end of the third side 242 of the second member 24 abuts against the lower surface of the third side 232 of the first member 23. The outdoor-side portion of the third side 232 of the first member 23, the folded-back portion of the second member 24, and the third side 242 form a recessed groove 222 that opens to the indoor side and extends horizontally in the width direction of the building opening, and a long watertight member (watertight rubber) 18 extending in the width direction of the opening is attached to the recessed groove 222.

[0048] 8, the third member 25 is a long member extending in the width direction of the opening and having a U-shaped cross section made up of a vertical side 250, an upper side 251 extending horizontally from the upper end of the vertical side 250 toward the indoor side, and a lower side 252 extending horizontally from the lower end of the vertical side 250 toward the indoor side. A space having a rectangular cross section is formed by the indoor side portion of the third side 232 of the first member 23, the fourth side 233, a portion adjacent to the bent portion of the first side 240 of the second member 24, and the third side 242, and the third member 25 is housed in this space.

[0049] The vertical edge 250 of the third member 25 abuts against the back surface (indoor surface) of the third edge 242 of the second member 24 and is connected by plug welding, the upper edge 251 abuts against the underside of the indoor portion of the third edge 232 of the first member 23 and is connected by plug welding, the lower edge 252 abuts against the upper surface of the portion adjacent to the folded-back portion of the first edge 240 of the second member 24, and the indoor end of the upper edge 251 and the indoor end of the lower edge 252 abut against the outdoor surface of the fourth edge 233 of the first member.

[0050] As described above, the upper frame 2′ of the second embodiment is formed from the first member 23 that forms the first surface portion and the second member 24 that forms the second surface portion, The first member 23 includes a first side 230 that forms a first surface portion, and an indoor side support side (fourth side 233) that is located on the indoor side of the bottom surface of the recessed groove 222, The second member 24 includes a first side 240 that forms a second surface portion, a second side 241 that overlaps with the inner surface of the outdoor side portion of the first side 240 to form a folded-back portion, and a third side 242 that rises vertically from the indoor side end portion of the second side 241, The first surface of the recessed groove 222 is formed from the outdoor side portion of the third side 232 of the first member 23, The second surface of the recessed groove 222 is formed from the second side 241 of the second member 24, The bottom surface of the recessed groove is formed from the third side 242 of the second member 24, The indoor side support edge (fourth edge 233) of the first member 23 faces the indoor side of the third edge 242 of the second member 24 at a distance, A third member 25 is provided between the indoor side support edge (fourth edge 233) of the first member 23 and the third edge 242 of the second member 24. a vertical edge 250 of the third member 25 is welded to a third edge 242 of the second member 24 in abutting contact therewith, and an upper edge 251 of the third member 25 is welded to a third edge 232 of the first member 23 in abutting contact therewith; The third side 242 of the second member 24 is indirectly supported from the indoor side by the indoor side supporting side (fourth side 233) of the first member 23 via the third member 25. The upper frame 2' has a structure in which the first member 23, the second member 24, and the third member 25 are connected together, and has a water pressure resistant structure that can withstand a force (water pressure) acting in the direction of the arrow. It will be understood by those skilled in the art that the water-resistant structure of this upper frame 2' can also be applied to the lower frame and the left and right vertical frames as a water-resistant structure in a frame formed from multiple components.

[0051] The basic configuration of the lower frame 3 according to the second embodiment is the same as that of the lower frame 3 according to the first embodiment, and the description of the lower frame 3 according to the first embodiment can be used. The lower frame 3 according to the second embodiment is formed from a first member 33 that forms a first surface portion (outdoor side surface portion 320) and a second member 34 that forms a horizontal second surface portion (indoor side surface portion 321). The first member 33 includes a first side 330 that forms the first surface portion (outdoor side surface portion 320), a second side 331 that rises vertically from the indoor side end of the first side 330, and a third side 332 that extends horizontally from the upper end of the second side 331 toward the indoor side. The second member 34 includes a horizontal first edge 340 that forms the second surface portion (indoor side surface portion 321), a horizontal second edge 341 that overlaps with the underside of the outdoor portion of the first edge 340 to form a horizontal folded portion, and a third edge 342 that hangs down from the indoor end portion of the second edge 341.

[0052] The groove 322 consists of opposing lower first and upper second surfaces, and a vertical bottom surface, the first surface of the groove 322 consisting of the indoor side portion of the first side 330 of the first member 33, the second surface of the groove 322 consisting of the second side 341 of the second member 34, the bottom surface of the groove 322 being formed by the third side 342 of the second member 34, and the second side 331 of the first member 33 being welded (plug welded) in a state of abutment against the back surface of the third side 342 of the second member 34 which forms the bottom surface of the groove 322, the bottom surface portion of the groove 322 consisting of an overlapping portion formed by welding the second side 331 of the first member 33 and the third side 342 of the second member 34 in a state of abutment, and the third side 332 of the first member 33 being abutted against the underside of the portion of the first side 340 of the second member 34 adjacent to the folded portion.

[0053] The basic configuration of the first vertical frame 5A and the second vertical frame 5B in the second embodiment is the same as the configuration of the end-of-door side vertical frame 5 in the first embodiment, and the description of the end-of-door side vertical frame 5 in the first embodiment can be used.

[0054] The groove 222 formed in the upper frame 2, the groove 322 formed in the lower frame 3, and the grooves 522A, 522B formed in the trailing edge vertical frames 5A, 5B are continuous around the four sides in a front view seen from the outdoor side, and watertight members 18 are attached around the four sides of the grooves 222, 322, 522A, 522B. When the building opening is closed by the first door body 1A and the second door body 1B, the upper, lower, and trailing edge portions of the indoor side surface 11 of the first door body 1A and the upper, lower, and trailing edge portions of the indoor side surface 11 of the second door body 1B come into contact with the watertight members 18, thereby forming a four-sided sealed structure around the four sides of the building opening. In addition, the leading edge portion of the indoor side surface 11 of the second door body 1B comes into contact with the watertight members 18', thereby forming a sealed structure in the height direction at the joint portion.

[0055] [C] Modified door frame with water-resistant structure Fig. 10 shows a modified example of the water-pressure-resistant structure of the lower frame. The lower frame 3' is formed from a first member 33', a second member 34', and a third member 35'. The first member 33' includes a first side 330' that forms the first surface portion 320, a second side (indoor side support side) 331' that is located on the indoor side of the bottom surface of the recessed groove 322', a third side 332' that extends horizontally from the upper end of the indoor side support side 331' toward the indoor side, and a fourth side 333' that hangs down from the outdoor side end of the first side 330'. The second member 34' includes a first side 340' that forms the second surface portion 321, a second side 341' that overlaps with the inner surface of the outdoor-facing portion of the first side 340' to form a folded-back portion, a third side 342' that hangs down from the indoor-side end of the second side 341', and a fourth side 343' that hangs down from the indoor-side end of the first side 340'. A first surface of the groove 322' is made up of a portion of the first member 33' (a portion of the first side 330'), a second surface of the groove 322' is made up of the second side 341' of the second member 34', and a bottom surface of the groove 322' is made up of the third side 342' of the second member 34'. The indoor side support edge 331' of the first member 33' faces the indoor side of the third edge 342' of the second member 34' at a distance, and a third member 35 having a U-shaped cross section is provided between the indoor side support edge 331' of the first member 33' and the third edge 342' of the second member 34'. The third member 35 is welded to the first member 33' and the second member 34'. The third edge 342' of the second member 34' is indirectly supported from the indoor side by the indoor side support edge 331' of the first member 33'.

[0056] Figure 11 shows a modified example of the water pressure resistant structure of the upper frame. The upper frame 2'' is formed from a first member 23' and a second member 24'. The first member 23' includes a first side 230' forming the first surface portion 220', a second side 231' hanging down from the indoor side end of the first side 230', a third side 232' extending horizontally from the lower end of the second side 231' toward the indoor side, a fourth side (indoor side support side) 233' hanging down from the indoor side end of the third side 232', a fifth side 234' extending from the lower end of the fourth side 233' toward the indoor side, and a sixth side 235' rising vertically from the indoor side end of the first side 230'. The second member 24' includes a first side 240' that forms the second surface portion 221', a second side 241' that overlaps with the upper surface of the outdoor-side portion of the first side 240' to form a folded portion, a third side 242' that rises perpendicularly from the indoor-side end of the second side 241', and a fourth side 243' that rises perpendicularly from the indoor-side end of the first side 240'. A first surface of the groove 222' is formed by a portion of the first member 23' (third side 232'), a second surface of the groove 222' is formed by the second side 241' of the second member 24', and a bottom surface of the groove 222' is formed by the third side 242' of the second member 24'. The third side 242' of the second member 24' is directly supported from the indoor side by a fourth side (indoor-side support side) 233' of the first member 23'.

[0057] [D] Water-resistant structure of the door frame according to this embodiment When water pressure acts from the outdoors when the door device according to this embodiment is in the fully closed state, the four peripheral edges of the indoor side surface 11 of the door body 1, or the three edges of each of the indoor side surfaces 11 of the first door body 1A and the second door body 1B, are displaced toward the indoor side while pressing on the watertight members 18 attached to the recessed grooves 222, 322, 422, 522 (522A, 522B). Regardless of the flooding height, greater water pressure can act on the lower parts of the outdoor side surfaces 10 of the door body 1, the first door body 1A, and the second door body 1B (when the flooding height is low, water pressure acts only on the lower parts, and when the flooding height is high, the pressure acting on the door body increases in proportion to the flooding height, so greater water pressure acts on the lower parts). Therefore, the sill 3 in particular is required to have water pressure resistance.

[0058] The water pressure resistant structure and operation of the lower frame 3 common to the first and second embodiments will be described with reference to Figure 9. The lower frame 3 is formed of a first member 33 and a second member 34. The first surface of the groove 322 of the lower frame 3 consists of the indoor side portion of the first edge 330 of the first member 33, the second surface of the groove 322 consists of the second edge 341 of the second member 34, the bottom surface of the groove 322 is formed from the third edge 342 of the second member 34, and the second edge 331 of the first member 33 is welded in abutting contact with the back surface of the third edge 342 of the second member 34 which forms the bottom surface of the groove 322, and the bottom portion of the groove 322 consists of an overlapping portion formed by welding the second edge 331 of the first member 33 and the third edge 342 of the second member 34 in an abutting contact state, and the third edge 332 of the first member 33 abuts against the underside of the portion adjacent to the folded-back portion of the first edge 340 of the second member 34.

[0059] In the left diagram of Figure 9, when water pressure acts on the lower part of the door body, the water pressure acts so that the lower end of the indoor side surface portion 11 of the door body pushes in the contacted part 181 of the watertight member 18, and a force acts on the lower frame 3 to press the bottom surface of the groove 322 to which the base 180 of the watertight member 18 is fixed toward the indoor side, and further, as the contacted part 181 of the watertight member 18 deforms in such a way that it is crushed, a force acts on the lower end of the indoor side surface portion 11 of the door body to press the outdoor tip 344 of the folded-back part toward the indoor side.

[0060] As shown in the right diagram of Figure 9, in this embodiment, the bottom portion of the groove 322 is composed of the overlapping portion between the third side 342 of the second member 34 and the second side 331 of the first member 33, and the force in the direction of the arrow acts in a direction to tightly seal the third side 342 of the second member 34 against the second side 331 of the first member 33 (a direction perpendicular to the direction of peeling off the plug weld between the second side 331 of the first member 33 and the third side 342 of the second member 34), and the force acting to move the second side 331 of the first member 33 toward the indoor side is borne by the first side 330 of the first member 33, which is integrally formed with the outdoor side portion of the second side 331 of the first member 33. Furthermore, the third edge 332 of the first member 33 abuts against the underside of a portion of the first edge 340 of the second member 34 adjacent to the folded portion, and the first edge 330, second edge 331, and third edge 332 of the first member 33 and the first edge 340, second edge 341, and third edge 342 of the second member 34 cooperate to oppose the welded portion (connection portion) of the first member 33 and the second member 34, thereby improving the water pressure resistance of the lower frame 3 formed by connecting the first member 33 and the second member 34. Note that although the water pressure resistant structure of the lower frame 3 has been described, it will be understood by those skilled in the art that this water pressure resistant structure can also be applied to the left and right vertical frames and the upper frame.

[0061] [E] Reinforcement structure of the lower frame As shown in Figure 13, the lower frame 3 includes an outdoor-side facing portion 30, an indoor-side facing portion 31, and an upper surface portion 32. The upper surface portion 32 is made up of an inclined outdoor side surface portion 320, a horizontal indoor side surface portion 321, and a groove 322 that opens to the outdoor side. In the illustrated embodiment, the lower frame 3, which includes the outdoor-side facing portion 30, the indoor-side facing portion 31, and the upper surface portion 32 (including the groove 322), is obtained by connecting a first member 33 and a second member 34 that are bent into a predetermined shape. The height position of the outdoor-side portion 320 is lower than the height position of the indoor-side portion 321, and the indoor-side portion of the outdoor-side portion 320 and the outdoor-side portion of the indoor-side portion 321 face each other in a stepped manner, with the groove 322 formed between them. A long watertight member (watertight rubber) 18 is attached to a recessed groove 322 extending in the width direction of the building opening.

[0062] The first member 33 has a portion that forms the outdoor side surface portion 320 and the outdoor facing portion 30 of the upper surface portion 32 of the lower frame 3, and the second member 34 has a portion that forms the indoor side surface portion 321 and the indoor facing portion 31 of the upper surface portion 32 of the lower frame 3. The first member 33 is composed of a first side 330 that extends sloping upward from the outdoor side toward the indoor side, a second side 331 that rises vertically from the indoor side end of the first side 330, a third side 332 that extends horizontally from the upper end of the second side 331 toward the indoor side, a fourth side 333 that hangs down from the outdoor side end of the first side 330, a fifth side 334 that extends horizontally from the lower end of the fourth side 333 toward the indoor side, and a sixth side 335 that hangs down from the indoor side end of the fifth side 334. The first side 330 of the first member 33 forms the outdoor side surface portion 320 of the upper surface portion 32 of the lower frame 3, and the fourth side 333 of the first member 33 forms the outdoor facing portion 30 of the lower frame 3.

[0063] The second member 34 comprises a horizontally extending first side 340, a horizontal second side 341 that overlaps the inner surface of the outdoor portion of the first side 340 to form a folded portion, a third side 342 that hangs down from the indoor side end of the second side 341, and a fourth side 343 that hangs down from the indoor side end of the first side 340. The first side 340 of the second member 34 forms the indoor side portion 321 of the upper surface 32 of the lower frame 3, and the fourth side 343 of the second member 34 forms the indoor side facing portion 31 of the lower frame 3. The folded portion formed by the outdoor portion of the first side 340 and the second side 341 is formed, for example, by hemming.

[0064] The groove 322 is formed of an upper portion (inner portion), a lower portion (outer portion), and a bottom portion. The upper portion of the groove 322 is formed by the folded-back portion of the second member 34, and the second side 341 of the second member 34 forms the inner surface of the upper portion. The lower portion of the groove 322 is formed by the indoor-side portion of the first side 330 of the first member 33. The bottom portion of the groove 322 is formed by an overlapping portion formed by welding (plug welding) the second side 331 of the first member 33 and the third side 342 of the second member 34 in an abutting state. At the overlapping portion, the third side 342 of the second member 34 is located on the outdoor side and forms the inner surface of the bottom portion, and the second side 331 of the first member 33 is located on the indoor side and abuts against the back surface (indoor surface) of the third side 342 of the second member 34. The third side 332 of the first member 33 abuts (may be welded to) the underside of a portion of the first side 340 of the second member 34 that is adjacent to the folded-back bent portion.

[0065] A steel reinforcing member 36 is provided inside the lower frame 3. For example, the reinforcing member 36 is fixed to the lower frame 3 by welding, but the reinforcing member 36 may also be glued to the lower frame 3. The reinforcing member 36 consists of an outdoor facing portion 360, an indoor facing portion 361, an inclined outdoor side portion 362, a rising edge 363, a horizontal indoor side portion 364, and an outdoor lower edge 365. The outdoor facing portion 360 of the reinforcing member 36 abuts against the back surface of the outdoor facing portion 30 (the fourth side 333 of the first member 33) of the lower frame 3, the indoor facing portion 361 of the reinforcing member 36 abuts against the back surface of the indoor facing portion 31 (the fourth side 343 of the second member 34) of the lower frame 3, the outdoor side surface portion 362 of the reinforcing member 36 abuts against the back surface of the outdoor side surface portion 320 (the first side 330 of the first member 33) of the upper surface portion 32 of the lower frame 3, the rising side 363 of the reinforcing member 36 is located on the indoor side of the second side 331 of the first member 33 of the lower frame 3 and faces it at a distance, and the indoor side surface portion 364 of the reinforcing member 36 abuts against the back surface (excluding the tip side portion) of the indoor side surface portion 321 (the first side 340 of the second member 34) of the upper surface portion 32 of the lower frame 3. In this embodiment, the reinforcing member 36 has substantially the same width as the lower frame 3, but a plurality of reinforcing members may be provided at intervals in the width direction.

[0066] A plurality of strip-shaped members (commonly known as strip anchors) 38 extending in the indoor / outdoor direction are provided on the underside of the lower frame 3, and the strip-shaped members 38 are connected to the skeleton C via reinforcing bar anchors 39, thereby supporting the lower frame 3 on the skeleton C. More specifically, in this embodiment, the strip-shaped members 38 have an L-shaped cross section, consisting of a horizontal edge 380 extending in the indoor / outdoor direction and a vertical edge 381 rising from the indoor-side end of the horizontal edge 380. The outdoor-side tip portion of the horizontal edge 380 is fixed (welded) to the upper surface of the indoor-side portion of the outdoor-side lower edge 365, and the upper end portion of the vertical edge 381 is fixed (welded) to the indoor-side facing portion 361 of the reinforcing member 36. The upper end portions of reinforcing bar anchors 39 are fixed (welded) to the outdoor and indoor sides of the horizontal edge 380 of each strip-shaped member 38, and the lower ends of the reinforcing bar anchors 39 are fixed to the skeleton C.

[0067] As described above, in this embodiment, in the lower frame 3 formed by connecting the first member 33 and the second member 34, the first surface of the groove 322 of the lower frame 3 consists of the indoor side portion of the first edge 330 of the first member 33, the second surface of the groove 322 consists of the second edge 341 of the second member 34, the bottom surface of the groove 322 is formed by the third edge 342 of the second member 34, and the second edge 331 of the first member 33 is welded in abutting contact with the back surface of the third edge 342 of the second member 34 that forms the bottom surface of the groove 322, and the bottom portion of the groove 322 consists of an overlapping portion formed by welding the second edge 331 of the first member 33 and the third edge 342 of the second member 34 in an abutting contact state, and further, the third edge 332 of the first member 33 abuts (or may be welded to) the underside of the portion adjacent to the folded-back portion of the first edge 340 of the second member 34. By adopting such a structure, the water pressure resistance of the lower frame 3 formed by connecting the first member 33 and the second member 34 is improved.

[0068] However, when water pressure acts on the outdoor side surface 10 of the door body 1 when the door body 1 is in the closed position, and the lower end portion of the indoor side surface 11 of the door body 1 presses the watertight member 18 fitted into the groove 322 of the bottom frame 3 toward the indoor side, if even greater water pressure acts, the watertight member 18 will be compressed, and the lower end portion of the indoor side surface 11 of the door body 1 will abut against the outdoor tip 344 of the folded portion formed by the outdoor portion of the first edge 340 and the second edge 341, and a force will be applied that presses the folded portion toward the indoor side, which may result in the outdoor portion of the bottom frame 3 being deformed and lifted, as shown schematically in Figure 15.

[0069] In this embodiment, a connecting member 37 that connects the outdoor side surface portion 320 of the upper surface portion 32 to the strip-shaped member 38 is provided inside the lower frame 3, thereby suppressing deformation of the lower frame 3. In this embodiment, the outdoor side surface portion 362 of the reinforcing member 36 is fixed to the back surface of the outdoor side surface portion 320, and therefore the connecting member 37 connects the outdoor side surface portion 362 of the reinforcing member 36 fixed to the back surface of the outdoor side surface portion 320 of the upper surface portion 32 to the strip-shaped member 38. The connecting member 37 is composed of an upper portion 370 that is fixed (welded) to the outdoor side surface portion 362 of the reinforcing member 36, a lower portion 371 that is fixed (welded) to the strip-shaped member 38, and a rising portion 372 that connects the indoor-side end of the upper portion 37 to the outdoor-side end of the lower portion 371. The upper portion 70 of the connecting member 7 is located generally outside of the outdoor end 344 of the folded portion formed by the outdoor portion of the first side 340 and the second side 341. In one embodiment, a connecting member 37 is provided corresponding to each strip-shaped member 38, but the connecting members 37 extending in the width direction of the lower frame 3 may also correspond to multiple strip-shaped members 38.

[0070] The shape of the connecting member 37 is not limited to that shown in Fig. 13. For example, as shown in Fig. 14, the connecting member 37 may have a generally U-shaped cross section, composed of an upper portion 370, a lower portion 371, and a rising portion 372, with the upper portion 370 fixed (welded) to the outdoor side surface portion 362 of the reinforcing member 36, and the lower portion 371 fixed (welded) to the strip-shaped member 38. For specific configurations and descriptions of the lower frame 3, the reinforcing member 36, the strip-shaped member 38, and the rebar anchors 39, the descriptions in Fig. 13 and related to Fig. 13 can be used. The entire upper portion 70 of the connecting member 37 is located outdoors relative to the outdoor tip 344 of the folded-back portion formed by the outdoor portion of the first side 340 and the second side 341.

[0071] [Note] The lower frame of the door device includes a first surface portion to which the lower end portion of the door body faces when the opening is fully closed, a second surface portion located on the indoor side of the first surface portion, and a recessed groove formed between the indoor side portion of the first surface portion and the outdoor side portion of the second surface portion, opening to the outdoor side, and fitted with a watertight member; the lower frame includes a first member including the first surface portion and a second member including the second surface portion, the first member includes a first side that forms the first surface portion and a second side that rises perpendicularly from an indoor side end of the first side, the second member includes a horizontal first side that forms the second surface portion, a horizontal second side that overlaps with a lower surface of an outdoor-side portion of the first side to form a horizontal folded-back portion, and a third side that hangs down from an indoor-side end portion of the second side, The groove includes a first surface on the lower side and a second surface on the upper side that face each other, and a bottom surface that is a vertical surface, the first surface of the recessed groove is formed from an indoor portion of the first side of the first member, the second surface of the recessed groove is formed by the second side of the second member, the bottom surface of the recessed groove is formed from the third side of the second member, The second side of the first member is welded in a state in which it abuts against the back surface of the third side of the second member that forms the bottom surface of the recessed groove. Water-resistant structure of door device. In one embodiment, the first member includes a third side extending horizontally from an end of the second side toward the indoor side, The third side of the first member abuts against the lower surface of the first side of the second member at a portion adjacent to the folded-back portion. In one embodiment, a plurality of strip-shaped members extending in the indoor / outdoor direction are provided on the lower side of the lower frame, The belt-shaped member is connected to the skeleton via a reinforcing bar anchor, so that the lower frame is supported by the skeleton; A connecting member is provided inside the lower frame, the connecting member having an upper portion fixed to the first surface portion and a lower portion fixed to the belt-shaped member so as to connect the first surface portion and the belt-shaped member. In one embodiment, a plate-shaped reinforcing member is provided inside the lower frame so as to abut against the back surface of the lower frame, a portion of the reinforcing member abuts against the rear surface of the first surface portion, The upper portion of the connecting member is fixed to the portion of the reinforcing member. In one embodiment, at least a portion of the upper portion of the connecting member is located closer to the outdoor side than the outdoor-side tip of the second surface portion. [Explanation of symbols]

[0072] 1 Door body 1A First door body 1B Second door body 11 Indoor side section 2. Upper frame (four-sided frame) 2´ Upper frame (four-sided frame) 220´ Outdoor side part (first side part) 221´ Indoor side part (second side part) 222 groove 23 First member 230 Side 1 232 Third Side 233 4th side (indoor support side) 233´ 4th side (indoor support side) 234 Side 5 24 Second member 240 Side 1 241 Second side (folded part of second member) 242 Third side (folded part of second member) 25 Third member 3 Bottom frame (four-sided frame) 320 Outdoor side section (first surface section) 321 Indoor side section (second surface section) 322 Groove 33 First member 330 Side 1 331 Second side (indoor support side) 331´ 2nd side (indoor support side) 332 Third Side 34 Second member 340 Side 1 341 Second edge (folded part of second member) 342 Third side (folded part of second member) 344 Outdoor end of folded section 36 Reinforcement member 37 Connecting member 370 Upper part 371 Lower part 38 Belt-shaped member 39 Rebar anchors 4. Vertical frame at the front of the door (four-sided frame) 5. Vertical frame at the end of the door (all four sides) C frame

Claims

1. The lower frame of the door device is composed of a first member and a second member located on the indoor side of the first member, and has a recessed groove in which a watertight member is attached, The first member includes a first side to which a lower end of the door body faces when the opening is fully closed, and a second side that rises vertically from an indoor side end of the first side, The second member includes a horizontal first side located on the indoor side of the door body, a horizontal second side that overlaps with the underside of the outdoor side portion of the first side to form a horizontal folded portion, and a third side that hangs down from the indoor side end of the second side, The groove includes a first surface on the lower side and a second surface on the upper side that face each other, and a bottom surface that is a vertical surface, the first surface of the recessed groove is formed from an indoor side portion of the first side of the first member, the second surface of the recessed groove is formed by the second side of the second member, the bottom surface of the recessed groove is formed from the third side of the second member, The second side of the first member is welded to the back surface of the third side of the second member that forms the bottom surface of the groove in a state where the second side is in contact with the back surface of the third side of the second member, and the third side of the second member that forms the bottom surface is supported from the indoor side by the second side of the first member welded to the back surface of the third side, and the second side of the first member faces the internal space of the lower frame. Water-resistant structure of door device.

2. the first member includes a third side extending horizontally from an end of the second side toward the indoor side, the third side of the first member abuts against a lower surface of a portion of the first side of the second member that is adjacent to the folded-back portion; The water pressure resistant structure of a door device according to claim 1.

3. The lower frame of the door device comprises a first surface portion to which the lower end of the door body faces when the opening is fully closed, a second surface portion located on the indoor side of the first surface portion, and a groove formed between the indoor side portion of the first surface portion and the outdoor side portion of the second surface portion, opening to the outdoor side, and into which a watertight member is attached; the lower frame includes a first member including the first surface portion and a second member including the second surface portion, the first member includes a first side that forms the first surface portion and a second side that rises perpendicularly from an indoor side end of the first side, the second member includes a horizontal first side that forms the second surface portion, a horizontal second side that overlaps with a lower surface of an outdoor-side portion of the first side to form a horizontal folded-back portion, and a third side that hangs down from an indoor-side end portion of the second side, The groove includes a first surface on the lower side and a second surface on the upper side that face each other, and a bottom surface that is a vertical surface, the first surface of the recessed groove is formed from an indoor side portion of the first side of the first member, the second surface of the recessed groove is formed by the second side of the second member, the bottom surface of the recessed groove is formed from the third side of the second member, the second side of the first member is welded to a back surface of the third side of the second member that forms a bottom surface of the recessed groove in a state of abutting against the back surface of the third side of the second member, A plurality of strip-shaped members extending in the indoor / outdoor direction are provided on the lower side of the lower frame, The belt-shaped member is connected to the skeleton via a reinforcing bar anchor, so that the lower frame is supported by the skeleton; A connecting member is provided inside the lower frame, the connecting member having an upper portion fixed to the first surface portion and a lower portion fixed to the belt-shaped member so as to connect the first surface portion and the belt-shaped member. Water-resistant structure of door device.

4. A plate-shaped reinforcing member is provided inside the lower frame so as to abut against the rear surface of the lower frame, a portion of the reinforcing member abuts against a rear surface of the first surface portion, the upper portion of the connecting member is fixed to the portion of the reinforcing member; The water pressure resistant structure of a door device according to claim 3.

5. At least a portion of the upper portion of the connecting member is located on the outdoor side relative to the outdoor-side tip of the second surface portion. The water pressure resistant structure of the door device according to claim 3 or 4.

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