Waterproofing structure for entrance and double-leaf doors

Abstract

To provide a joint watertight structure capable of ensuring uniform watertightness by mitigating partial stress concentration when a door is closed and capable of preventing partial deterioration of an elastic seal body arranged in a watertight member. [Solution] The water-stopping structure for the joint of both closed opening doors comprises a curved arc water-stopping member arranged convexly on the protected area side so as to be spanned from the lower end of the door edge of the first-closing door upward along the joint to the door edge of the back-closing door, and an arc-shaped fitting recess formed in the bottom frame of the door frame into which the vicinity of the lower end of the curved arc water-stopping member fits via an elastic seal when the first-closing door is closed.

Description

[Technical field]

[0001] The present invention relates to a waterproof structure for a joint of a double-leaf door and a waterproof structure for a double-leaf door. [Background technology]

[0002] 2. Description of the Related Art Conventionally, various water stop devices have been proposed to prevent flood damage to buildings and the like in the event of rainfall exceeding drainage capacity.

[0003] In particular, retrofit-type waterstop devices that can give waterstop functionality to doors that do not have waterstop capabilities eliminate the need to replace the door or door frame itself with a waterstop door, and therefore can significantly reduce the cost and effort required to prevent water intrusion in existing swing doors (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7050259 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the above-mentioned conventional water-stopping structure using an add-on water-stopping device uses a block-shaped joint protrusion that is trapezoidal in plan view to stop water from entering between the joint and the bottom frame part of the door frame, which causes problems such as partial stress concentration when the door is closed, making it difficult to achieve uniform watertightness, and the elastic seal member arranged in the water-stopping member is prone to partial deterioration.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and provides a joint water-stopping structure that can ensure uniform watertightness by alleviating partial stress concentration when the door is closed, and also prevents partial deterioration of the elastic seal body arranged in the water-stopping member.

[0007] The present invention also provides a waterproof structure for a double-leaf door having the above-mentioned joint waterproof structure. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the water stop structure for a joint portion of the present invention comprises: (1) a water stop structure for a joint portion of a double-opening door that is closed, the water stop structure for a joint portion of the double-opening door that is closed, the water stop member having an arc-shaped curved surface portion as a whole that is arranged convexly on the protected area side so as to be bridged from the lower end of the door end side of the first-closing door upward along the joint portion to the door end side of the rear-closing door; and a fitting recess having an arc-shaped curved portion as a whole that is formed on the lower frame of the door frame into which the arc-shaped curved surface portion near the lower end of the water stop member fits via an elastic seal when the first-closing door is closed. Circular curved surface The arc portion in the planar cross-sectional view is defined as the arc portion included on the protected area side of the circumference of a circle whose center is closer to the flooded area than the protected area side surface of each door.

[0009] The waterproof structure of the joint according to the present invention is also characterized in the following respects. (2) The circular-arc curved surface water-stopping member Circular curved surface The angle formed by the tangent to the end of the arc portion on the front closing door side in a planar cross-sectional view and the door surface on the protected area side when the front closing door is closed, and the angle formed by the tangent to the end of the arc portion on the rear closing door side and the door surface on the protected area side when the rear closing door is closed, are both obtuse angles. (3) The surface of the arc-curved water-stopping member facing the rear-closing door has an inclined surface in which the gap gradually widens from the door end side to the hanging side of the rear-closing door, and a trapezoidal elastic seal body is arranged on the inclined surface when viewed in cross section in the plan view.

[0010] In addition, the waterproof structure for a double-opening door of the present invention is (4) a waterproof structure for a closed double-opening door, comprising a joint water-stopping structure as described in claim 1 that prevents water from entering through the joint of the front-closing door and the rear-closing door, a hanging water-stopping structure that prevents water from entering through gaps in the door frame at the hanging sides of each of the front-closing door and the rear-closing door, and a bottom water-stopping structure that prevents water from entering through gaps in the door frame at the bottoms of each of the front-closing door and the rear-closing door. Effect of the Invention

[0011] According to the water-stopping structure for the joint of the present invention, a curved water-stopping member is arranged convexly on the protected area side so that it is spanned from the lower end of the door edge of the first-closing door along the joint upward to the door edge of the rear-closing door, and a circular arc-shaped fitting recess formed in the lower frame of the door frame into which the vicinity of the lower end of the curved water-stopping member fits via an elastic seal when the first-closing door is closed.This makes it possible to provide a water-stopping structure for the joint that can alleviate partial stress concentration when the door is closed, ensuring uniform water-tightness and preventing partial deterioration of the elastic seal arranged in the water-stopping member.

[0012] Furthermore, if the angle formed by the tangent to the front-closing door side end of the arc portion in a planar cross-sectional view of the arc curved surface water-stopping member and the door surface on the protected area side when the front-closing door is closed, and the angle formed by the tangent to the rear-closing door side end of the arc portion and the door surface on the protected area side when the rear-closing door is closed, are each obtuse angles, solid water-tightness of the front-closing door side end and the rear-closing door side end of the arc portion can be ensured.

[0013] In addition, the surface of the arc-curved water-stopping member facing the rear-closing door is provided with an inclined surface in which the gap gradually widens from the door end side of the rear-closing door to the hanging side, and by arranging an elastic seal body that is trapezoidal when viewed in cross section in the planar direction on this inclined surface, the elastic seal body can come into contact with the rear-closing door on an approximately parallel plane, making it easier to compress the elastic seal body and ensuring solid watertightness.

[0014] In addition, if a waterproof structure for a closed double-leaf door is provided with the joint water-stopping structure described in claim 1 that prevents water from entering through the joint of the front-closing door and the rear-closing door, a hanging base water-stopping structure that prevents water from entering through gaps in the door frame at the hanging sides of the front-closing door and the rear-closing door, and a bottom water-stopping structure that prevents water from entering through gaps in the door frame at the bottoms of the front-closing door and the rear-closing door, it is possible to provide a waterproof structure for a double-leaf door that has a joint water-stopping structure that can prevent partial deterioration of the elastic seal body arranged in the water-stopping member, while also providing water-tightness with the door frames at the hanging sides and bottoms of both doors. [Brief description of the drawings]

[0015] [Figure 1] An explanatory diagram showing the configuration of a watertight door device equipped with a joint watertight structure in this embodiment. [Diagram 2] An explanatory diagram showing the configuration of a watertight door device equipped with a joint watertight structure in this embodiment. [Diagram 3] This is an explanatory diagram showing the configuration of the hanging side structure, joint watertight structure, and lower frame side structure in a watertight door device. [Figure 4] FIG. 4 is an explanatory diagram showing the configuration of a hanging-side elastic water-stopping member. [Diagram 5] This is an explanatory diagram showing the configuration of the hanging side structure, joint watertight structure, and lower frame side structure in a watertight door device. [Figure 6] This is an explanatory diagram showing the configuration of the hanging side structure, joint watertight structure, and lower frame side structure in a watertight door device. [Figure 7] FIG. 4 is an explanatory diagram showing the configuration of the hanging side structure. [Figure 8] An explanatory diagram showing the configuration and installation state of the joint portion circular arc curved surface water-stopping member. [Figure 9] An explanatory diagram showing the configuration of the lower frame side structure. [Figure 10] An explanatory diagram showing the configuration of the lower frame side structure. [Figure 11] FIG. 4 is an explanatory diagram conceptually showing the compressed state of an elastic seal body. [Figure 12] This is an explanatory diagram showing the configuration of the hanging side structure, joint watertight structure, and lower frame side structure in a watertight door device. [Figure 13] FIG. 4 is an explanatory diagram conceptually showing the compressed state of an elastic seal body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The present invention relates to a water-tight structure for the joint of a closed double-leaf door, and provides a water-tight structure for the joint that can ensure uniform water-tightness by alleviating partial stress concentration when the door is closed, and can prevent partial deterioration of the elastic seal body arranged in the water-tight member.

[0017] The joint watertight structure according to this embodiment and other watertight structures may be used as a structure for a newly created double-leaf door, but may also be used to impart watertight functionality to an already installed double-leaf door, such as a normal double-leaf door that does not have a function to prevent water from seeping in. In particular, in the latter case, watertight measures can be implemented more quickly and inexpensively than in the case of removing an existing double-leaf door and replacing it with a watertight door or performing large-scale construction such as modifying an existing door frame.

[0018] In addition, the doors constituting the double-leaf door may all be doors of approximately the same size, or may be doors of relatively different sizes. In other words, the double-leaf door includes so-called double doors and parent-child doors.

[0019] The material of the door is not particularly limited as long as it is a material that can ensure watertightness, but a steel door, for example, is preferable.

[0020] In addition, the double-leaf door is a door in which the direction of pressure applied to the door by the water pressure of the water trying to infiltrate during flooding coincides with the direction of closing of the door. Hereinafter, such a double-leaf door will also be referred to as a pressure-closed double-leaf door.

[0021] In addition, the water-stopping structure of the joint portion includes not only the water-stopping structure of the gap between the front-closing door and the rear-closing door, but also the water-stopping structure between the arc-curved water-stopping member and the lower frame.

[0022] A characteristic feature of the joint water-stopping structure of this embodiment is that it comprises an arc-shaped curved water-stopping member arranged convexly on the protected area side so that it is spanned from the lower end of the door edge of the first-closing door along the joint upward to the door edge of the rear-closing door, and an arc-shaped fitting recess formed in the bottom frame of the door frame into which the vicinity of the lower end of the arc-shaped water-stopping member fits via an elastic seal when the first-closing door is closed.

[0023] The above-mentioned conventional watertight structure with a trapezoidal block-shaped joint protrusion in a plan view has a problem that stress is easily concentrated at the bent corners, and when a double-leaf door is opened and closed on a daily basis, the elastic seal is easily deteriorated from the stress concentration points. Furthermore, if it deteriorates, it becomes difficult to ensure uniform watertightness.

[0024] In contrast, the joint water-stopping structure of this embodiment employs an arc-shaped curved water-stopping member as described above, and forms an arc-shaped mating recess in the bottom frame of the door frame to create a water-stopping structure by fitting these together, thereby making it possible to improve problems of stress concentration and ensuring watertightness compared to the conventional method.

[0025] Furthermore, the overall feature of the watertight door device described in this embodiment is that it is equipped with a specified hanging side structure, a rear-closing door end side structure, and a bottom frame side structure.

[0026] The hanging side structure is a structure in which, when the door is closed in a non-waterlogged state and not subjected to water pressure, the hanging side water-stopping member arranged in the hanging side vertical frame of the door frame, for example the hanging side vertical frame of the child door or the hanging side vertical frame of the parent door described below, is compressed with a pressure that provides watertightness between the door and the hanging side structure.

[0027] Here, the non-flooded state in which the door is not subjected to water pressure refers to a state in which water has not reached the door, and more specifically, for example, a normal state.

[0028] In addition, when the door is closed, it means that the door is fitted into the door frame. For example, a first-closing door is locked with a French release, and a rear-closing door can be understood as a door that is fitted into the door frame with a latch bolt or deadbolt able to lock into the strike formed on the end face of the first-closing door.

[0029] In the following explanation, compressing with a pressure that provides watertightness means, for example, when the height of the upper end position of the hanging side water-stopping member or the joint portion arc-curved surface water-stopping member is lower than the height at which the door handle, lock, etc. are installed (the height of the front and back penetration parts), and when the height of the upper end position of these water-stopping members is higher than the height of the front and back penetration parts, the water-stopping members are compressed with a pressure that does not allow water to seep in through the gaps in the door frame, even if water approaches the door at least up to the height of the front and back penetration parts.

[0030] The door end structure of a rear-closing door (for example, the water-stopping structure at the top of the door joiner described below) is designed so that when the door is closed in a non-waterlogged state, the water-stopping member at the door joiner's arc-shaped curved surface arranged in approximately the lower half of the door end edge of the front-closing door is compressed between the door and the door at a pressure below the contact pressure that generates the limit of elasticity that allows the door to be easily closed by hand, or does not come into contact with the door.

[0031] The contact pressure that produces the limit of elasticity that allows the door to be easily closed by hand does not mean a contact pressure where the repulsive force from the arc-curved water-stopping component at the joint is so strong that the door cannot be closed without pushing down hard, but a contact pressure that produces a repulsive force that allows the door to be opened and closed smoothly, taking into account the weight and size derived from the door material.

[0032] To give a concrete example to aid understanding, we can imagine a contact pressure that generates a repulsive force sufficient to close the door by inertia even if you let go of it, or sufficient to close the door by the force of the door closer.

[0033] Such a joint portion circular curved surface water-stopping member compressed between the rear-closing door at a pressure (easy closing pressure) below the contact pressure (easy closing limit pressure) that creates the limit of elastic force that allows the door to be easily closed by hand may, or may not, exhibit watertightness at the time the rear-closing door is closed in a non-waterlogged state.

[0034] In addition, when the door is closed in a non-waterlogged state, the joint portion arc-curved water-stopping member may not be in contact and may not be receiving compressive force from the door.

[0035] The bottom frame side structures can be broadly divided into rear-closing door side bottom frame structures constructed between the bottom of the rear-closing door excluding the area near the door edge and the rear-closing door side straight portion of the bottom frame water stopping member; front-closing door side bottom frame structures constructed between the bottom of the front-closing door excluding the area near the door edge and the front-closing door side straight portion of the bottom frame water stopping member; and joint lower water stopping structures constructed between the joint portion arc curved surface water stopping member and the curved portion of the bottom frame water stopping member, each with its own characteristics.

[0036] The rear-closing door side lower frame structure is a structure in which, when the door is closed in a non-waterlogged state, the rear-closing door side straight portion of the lower frame water-stopping member arranged in the lower frame of the door frame comes into contact or is not in contact with the door with a pressure gradient from the hanging side to the door end side, from the compression pressure at the hanging side structure to the compression pressure or non-contact state at the door end side structure of the rear-closing door.

[0037] In other words, the straight section of the rear closing door side of the lower frame water-stopping member in the rear closing door side lower frame structure is not pressurized with a uniform pressure from the hanging side to the door end side when the door is closed in a non-waterlogged state, but is pressurized with a pressure that gradually changes from a pressure that can achieve watertightness to an easy-closing pressure or an unpressurized state.

[0038] The lower frame structure on the first-closing door side is a structure in which, when the door is closed in a non-waterlogged state, the straight part of the lower frame waterstop member on the first-closing door side is compressed with a pressure that exerts watertightness between the first-closing door and the lower frame structure. In the watertight door device 10 according to this embodiment, which will be described later, the lower frame structure on the back-closing door side and the lower frame structure on the first-closing door side form a bottom watertight structure.

[0039] The lower joint watertight structure is a structure in which, when the door is closed in a non-waterlogged state, the curved portion of the lower frame watertight member is compressed with a pressure that exerts watertightness between the lower joint watertight member and the arcuate curved surface watertight member of the joint. In the watertight door device 10 according to this embodiment, which will be described later, the lower joint watertight structure and the aforementioned rear closing door end side structure (for example, the upper joint watertight structure described later) form the lower joint watertight structure.

[0040] Another feature is that when the door is closed in a flooded state, the rear closing door is allowed to rotate in order to compress the arc-curved water-stopping member at the joint until the water pressure causes the door to become watertight.

[0041] In other words, the rear-closing door is left with enough rotational space to be pushed further toward the door frame (in the door-closing direction) against the elastic force of the joint arc-shaped curved surface water-stopping member, and when the rear-closing door is pushed in by water pressure using this rotational space, the elastic seal body of the joint arc-shaped curved surface water-stopping member is compressed by the pressure that exerts watertightness. Such rotational space can be made use of the gap provided as play between the door and the door frame, or between the door ends of the front-closing door and the rear-closing door in a normal door-opening and closing device. In this case, if there is a spacer (doorstop cushion) to maintain the gap, the rotational movement will be restricted, so by removing this, the rotational space can be secured.

[0042] In this way, by providing the above-mentioned specified hanging side structure, rear-closing door door end side structure, and bottom frame side structure, and further providing a rotation allowance structure that allows at least further rotation of the rear-closing door by providing a rotation allowance to provide watertightness when water pressure is applied, it is possible to provide a water-stopping structure that is suitable for everyday use without the need for prior installation work when in use and without requiring special force to close the rear-closing door.

[0043] Although not particularly limited, it is desirable that the front-closing door and rear-closing door are parallel to the door frame when closed in a non-flooded state. In other words, by fitting the door parallel to the door frame in normal times, just like a normal swing door, it is possible to prevent the door from feeling visually uncomfortable, as well as the door will look the same in appearance as a normal swing door.

[0044] In addition, it is desirable that the elastic seal of the arcuate curved surface water-stopping member of the joint is compressed by water pressure to a state where water-tightness is exhibited, that is, when the door (especially the rear-closing door) is closed in a state where the door end side of the rear-closing door is further pressed into the door frame and is housed at a slight angle. In this state, water-tightness can be exhibited reliably.

[0045] The following describes the water-stopping structure of the joint part according to this embodiment, taking as an example a parent-child door that also has water-stopping structures in other parts. For the sake of convenience, the water-stopping structure on the three lower left and right edges of the door frame excluding the joint part will be mainly described first, and then the water-stopping structure of the joint part will be mainly described.

[0046] In addition, the water-stopping structure described here is not one that can prevent water from entering when the water level rises to the top of the door device, but one that can withstand water entering up to about half the height of the doors; however, it goes without saying that this height can be changed as appropriate.

[0047] In the following description, an area where flooding is expected or has already occurred will be referred to as a flooded area, and an area where flood damage needs to be suppressed will be referred to as a protected area, as shown in Fig. 2. In other words, the hinged door employing the waterproof structure according to this embodiment is located at the boundary between the flooded area and the protected area (hereinafter also referred to as a waterproof boundary).

[0048] In addition, in explaining the doors and each part, the direction between the flooded area and the protected area is also referred to as the front-rear direction as shown in Figure 2, the width direction of the door, etc. is also referred to as the left-right direction, and the height direction of the door, etc. is also referred to as the up-down direction as shown in Figure 1. For convenience of explanation, the front-rear direction may also be referred to as the direction in which people enter and exit, or the direction in which the door opens and closes (door opening direction, door closing direction).

[0049] 1 and 2 are explanatory diagrams showing a water stop door device 10, where FIG. 1 is a front view of the water stop door device 10 as seen from the protected area side, and FIG. 2 is an explanatory diagram showing a cross section taken along line XX in FIG.

[0050] The watertight door device 10 is a parent-child door type that does not have a watertight function, and is an existing steel fire door device to which a watertight member 11 has been retrofitted to turn it into a pressure-closed type door device to which a watertight structure S has been applied.

[0051] As shown in FIG. 1, the waterproof door device 10 is composed of a door frame 12, a door 13, a door closer 16, and a waterproof member 11.

[0052] The door frame 12 is a frame for storing a door 13 that can be opened and closed freely, and is installed by penetrating the wall 14 as shown in Figure 2. Also, as shown in Figure 1, it has a child door hanging side vertical frame 12k and a parent door hanging side vertical frame 12o that extend in the vertical direction, and a lower frame 12c and an upper frame 12d that extend in the left-right direction.

[0053] The door 13 is a member for closing an opening within the door frame 12, and is made up of a parent door 13o, which is a rear-closing door, and a child door 13k, which is a first-closing door. In this embodiment, as shown in Fig. 2, the parent door 13o is attached to the parent door hanging side vertical frame 12o on the left side of the page, and the child door 13k is attached to the child door hanging side vertical frame 12k on the left side of the page, each of which is attached via a hinge 15 so as to be able to swing freely.

[0054] In addition, a French drop 25 is provided on the child door 13k, and it can be changed between a fixed state in which it is fixed to the door frame 12 and an open, open state in which it can be opened and closed. In addition, since the watertight door device 10 according to this embodiment is used exclusively for entering and exiting the main door 13o and the child door 13k is not normally used, it is normally fixed with the French drop 25.

[0055] The door closer 16 is a device for automatically closing the main door 13o slowly by hydraulic pressure, and the main door 13o is biased by the door closer 16 in the closing direction.

[0056] The water-stopping member 11 is a member for preventing water from entering through gaps in the door frame 12 at the lower left and right three edges when the main door 13o or the secondary door 13k is closed, and from entering through the joint 26, and is composed of a hanging side water-stopping member 11a arranged on the parent door hanging side vertical frame 12o or the secondary door hanging side vertical frame 12k, a joint part arc curved surface water-stopping member 11b arranged in approximately the lower half of the door end side of the secondary door 13k, and a bottom frame water-stopping member 11c arranged on the bottom frame 12c.

[0057] In addition, the water-stopping structure S is composed of a hanging side structure S1, a joint water-stopping structure S2, and a sill side structure S3, and each structure is as follows.

[0058] That is, in this embodiment, the hanging side structure S1 is constructed of a parent door hanging side structure S1o and a child door hanging side structure S1k.

[0059] The main door hanging side structure S1o is constructed by the main door hanging side vertical frame 12o, the hanging side edge 13oa of the main door 13o, and the hanging side water-stopping member 11a.

[0060] In addition, the sub-door hanging side structure S1k is constructed by the sub-door hanging side vertical frame 12k, the hanging side edge 13ka of the sub-door 13k, and the hanging side water-stopping member 11a.

[0061] In this embodiment, the joint water-stopping structure S2 is constructed of an upper joint water-stopping structure S2u and a lower joint water-stopping structure S2d.

[0062] The upper water-stopping structure S2u of the joint is constructed by the joint portion arc-curved water-stopping member 11b arranged on the leading edge 13kb of the sub-door 13k and the leading edge 13ob of the main door 13o.

[0063] As shown in Figures 1 and 2, the joint lower water-stopping structure S2d is constructed by the joint arc-shaped curved surface water-stopping member 11b and the curved portion 27w of the lower frame water-stopping member 11c.

[0064] In addition, the lower frame side structure S3 is constructed by the lower frame waterproofing member 11c arranged on the lower frame 12c, the lower edge 13oc of the main door 13o, and the lower edge 13kc of the secondary door 13k.

[0065] More specifically, the lower frame side structure S3 is composed of a parent door side lower frame structure S3o, a child door side lower frame structure S3k, and the aforementioned lower joint water-stopping structure S2d.

[0066] The parent door side lower frame structure S3o is constructed between the parent door bottom main portion 13ocm of the lower edge 13oc of the parent door 13o, which corresponds to the bottom of the rear-closing door excluding the area near the door end, and the parent door side straight portion 27o, which corresponds to the rear-closing door side straight portion of the lower frame water-stopping member 11c.

[0067] The child door side lower frame structure S3k is constructed between the child door bottom main portion 13kcm of the lower edge 13kc of the child door 13k, which corresponds to the bottom of the first-closing door excluding the area near the door end, and the child door side straight portion 27k, which corresponds to the first-closing door side straight portion of the lower frame water-stopping member 11c.

[0068] The joint lower water-stopping structure S2d has the configuration described above, and is a structure that constitutes the joint portion water-stopping structure S2 and also a structure that constitutes the lower frame side structure S3.

[0069] In FIG. 1, the reference symbol 13ocs denotes the leading end portion 13ocs of the parent door bottom, and the reference symbol 13kcs denotes the leading end portion 13kcs of the child door bottom.

[0070] Fig. 3 is an explanatory diagram showing the configuration of the hanging side structure S1, the joint water-stopping structure S2, and the bottom frame side structure S3. In Fig. 3, for the sake of convenience, the left and right lengths of the parent door 13o, the child door 13k, the bottom frame 12c, etc. are shortened. The same is true for Figs. 5 and 6.

[0071] As shown in Figure 3, the opening 17 formed inside the door frame 12 (near the center of the page) has a flood side opening 17a in which approximately half of the flood area side has an opening width approximately the same as the combined width of the left and right widths of the parent door 13o and the child door 13k, while approximately half of the protection area side has an opening width shorter than this combined width as a protection side opening 17b.

[0072] The flood side opening 17a and the protection side opening 17b both function as an entrance for passage between the flooded area and the protection area, but the flood side opening 17a in particular also functions as a door accommodating section that accommodates the main door 13o and the secondary door 13k when closed.

[0073] In addition, a step portion 17c is formed at the boundary between the flood side opening 17a and the protection side opening 17b due to the difference in opening width and opening height, and the surface of the step portion 17c facing the flood area side is a door stop surface 17d.

[0074] The sub-door hanging side structure S1k shown on the right side of Figure 3 is composed of the sub-door hanging side vertical frame 12k, the hanging side edge 13ka of the sub-door 13k, and the hanging side water-stopping member 11a, as described above, and functions by the cooperation of these.

[0075] The hanging side water-stopping member 11a is an inner surface (also referred to as the protected side inner surface) that constitutes the protected side opening 17b among the inner surfaces (including the door stop surface 17d, hereinafter also referred to as the inner surface) of the door frame 12, and is disposed on the surface of the child door hanging side vertical frame 12k (hereinafter referred to as the protected side child door hanging inner surface 18ka) and fixed with screws 19.

[0076] Similarly, the parent door hanging side structure S1o shown on the left side of Figure 2 is composed of the parent door hanging side vertical frame 12o of the door frame 12, the hanging side water-stopping member 11a arranged on the parent door hanging side vertical frame 12o of the water-stopping member 11, and the hanging side edge 13o of the parent door 13o, and its function is achieved by the cooperation of these members, and the hanging side water-stopping member 11a is arranged on the protected side inner surface of the door frame 12, which is the surface of the parent door hanging side vertical frame 12o (hereinafter referred to as the protected side parent door hanging side inner surface 18oa), and is fixed with screws 19.

[0077] Here, the structure of the hanging-side water stop member 11a will be described with reference to Fig. 4. As shown in Fig. 4(a), the hanging-side water stop member 11a is composed of a long base member 20 that is generally L-shaped in cross section, a long support member 21 that is also generally U-shaped in cross section, and an elastic seal body 22 that is also long and generally rectangular in cross section.

[0078] The construction of the suspension-side water stop member 11a is as follows. First, the bottom surface 21a of the support member 21 is arranged along the longitudinal direction while facing the wide surface 20a on the inner side of the bend of the substrate member 20. At this time, the support member 21 is arranged closer to the inner side (closer to the narrow surface 20b) by a predetermined width d1 from the edge of the wide surface 20a, and a seal body arrangement margin 20c is formed along the edge. Note that the predetermined width (the width of the seal body arrangement margin) d1 is smaller than the width d2 of the elastic seal body 22 (d1 < d2), and is also smaller than the maximum width d3 at which the elastic seal body 22 can exhibit watertightness due to compression from the door 13 (d1 < d3 < d2). In this embodiment, an elastic seal body 22 with a width d2 of 10 mm in the free state and a maximum width d3 of 9.5 mm at which watertightness can be exhibited is adopted, and the predetermined width (the width of the seal body arrangement margin) d1 is set to 5 mm.

[0079] Next, as shown in FIG. 4(b), the suspension-side water stop member 11a is constructed by arranging the elastic seal body 22 in the seal body arrangement margin 20c.

[0080] The attachment of the suspension-side water stop member 11a to the inner peripheral surface 18ka of the suspension part of the protection-side sub-door is performed by inserting a screw 19 into a screw hole 23 formed in the suspension-side water stop member 11a, as shown in the lower right of FIG. 5.

[0081] Also, as shown in the upper right of FIG. 5, the screw hole 23 is a long hole with the longitudinal direction in the front-rear direction. Therefore, as in the case of the suspension-side water stop member 11a shown by the broken line in the lower right of FIG. 5, it is possible to easily adjust the front-rear mounting position of the suspension-side water stop member 11a with respect to the inner peripheral surface 18ka of the suspension part of the protection-side sub-door. Hereinafter, this configuration is referred to as the front-rear position adjustment mechanism.

[0082] Also, the configuration and attachment of the suspension-side water stop member 11a on the inner peripheral surface 18oa of the suspension part of the protection-side main door are the same as those of the inner peripheral surface 18ka of the suspension part of the protection-side sub-door described above, and the front-rear mounting position of the suspension-side water stop member 11a can be easily adjusted by the front-rear position adjustment mechanism.

[0083] Fig. 6 is an explanatory diagram showing the structure of the waterproof door device 10 when the doors are closed in a non-flooded state. As shown in the lower diagram of Fig. 6, when the doors are closed in a non-flooded state, the main door 13o and the sub door 13k are fitted parallel to the door frame 12 with a certain gap d4 between them and the door stop surface 17d from the hanging side of the main door 13o to the hanging side of the sub door 13k.

[0084] Furthermore, on the hanging side of the child door 13k, as shown in the upper right diagram of Figure 6, the hanging side water-stopping member 11a arranged on the child door hanging side vertical frame 12k of the door frame 12 is compressed with a pressure that exerts watertightness between the hanging side edge 13ka of the child door 13k, thereby constructing the child door hanging side structure S1k.

[0085] In addition, when the door is closed and not flooded, the sub-door hanging side structure S1k is established when the force in the door opening direction generated by the elastic seal body 22 of the hanging side water-stopping member 11a and the resistance caused by the engagement of the French stopper 25 with the door frame 12 are balanced at a position where the sub-door 13k is fitted parallel to the door frame 12.

[0086] Furthermore, the hanging side water stop member 11a is adjusted in its mounting position, i.e., its protruding position relative to the child door 13k, by using the front-rear position adjustment mechanism so that the width of the elastic seal body 22 becomes width d5 ​​at which watertightness is fully exhibited. In this embodiment, the width d5 ​​at which the child door hanging side structure S1k is fully watertight is set to 9 mm, which is 1 mm compressed from the width d2=10 mm of the elastic seal body 22 in the free state when the door is closed. This is a state that is further compressed than the width d3=9.5 mm at which watertightness can be exhibited as described above.

[0087] Furthermore, in the sub-door hanging side structure S1k, the hanging side water-stopping member 11a is arranged on the protected side sub-door hanging inner surface 18ka of the door frame 12 so that it abuts inside the opposing area with the doorstop surface 17d of the sub-door 13k when the door is closed, providing more reliable water-stopping compared to when an elastic seal body 22 is placed on the doorstop surface 17d to achieve water-stopping.

[0088] In addition, in the child door hanging side structure S1k, as shown in Figure 7, the position of the hanging side water-stopping member 11a is set to a position on the inner surface (door-end-side orientation surface) of the child door hanging side vertical frame 12k where it does not come into contact with the hanging side corner 13e when the child door 13k is opened or closed (non-contact position), or where even if it does come into contact, it only lightly touches the elastic sealing member 22 without causing significant twisting (light contact position).

[0089] For example, to refer more specifically to the non-contact position, the position of the hanging side water-stopping member 11a is adjusted by the front-to-rear position adjustment mechanism so that the elastic sealing body 22 does not come into contact with the rotational trajectory (shown by dashed line) of the hanging side corner 13e when the sub-door 13k is opened or closed, and is compressed to a width d5 ​​= 9 mm (corner non-contact / watertight width in normal condition) at which watertightness is fully exhibited when the door is closed.

[0090] This configuration can prevent the elastic seal body 22 from being twisted and deteriorated due to contact with the hanging side corner 13e caused by the rotation of the sub-door 13k. In addition, the elastic seal body 22 is compressed toward the protection area approximately perpendicular to the contact surface of the elastic seal body 22 by the hanging side edge 13ka that is approximately parallel to the left-right direction, so that the uniform compression can reliably prevent water leakage.

[0091] In this manner, the front-rear position adjustment mechanism functions as a contact pressure adjustment means for adjusting the contact pressure of the hanging side water-stopping member 11a against the child door 13k, thereby constructing the child door hanging side structure S1k.

[0092] In addition, the various configurations and installation adjustments in the above-mentioned child door hanging side structure S1k, for example the adjustment of the position of the hanging side water-stopping member 11a by the front-to-rear position adjustment mechanism to achieve a non-contact corner / normal watertight width (d5 = 9 mm), are approximately the same in the parent door hanging side structure S1o except that it is not fixed by the French drop 25.

[0093] That is, on the hanging side of the main door 13o, as shown in the upper left diagram of Figure 6, the hanging side water-stopping member 11a arranged on the parent door hanging side vertical frame 12o of the door frame 12 is compressed with a pressure that exerts watertightness between it and the hanging side edge 13oa of the child door 13k, thereby constructing the parent door hanging side structure S1o.

[0094] In addition, the attachment position of the hanging side water stop member 11a is adjusted using the front-rear position adjustment mechanism, that is, the protruding position is adjusted with respect to the parent door 13o, so that the width of the elastic seal body 22 becomes width d5 ​​at which watertightness is sufficiently exhibited by pressure (e.g., biasing force from the door closer 16) from the parent door 13o when the door is closed in a non-waterlogged state. Note that, like the child door hanging side structure S1k, the parent door hanging side structure S1o also has width d5 ​​at which watertightness is sufficiently exhibited, which is 9 mm, compressed by 1 mm from width d2=10 mm of the elastic seal body 22 in the free state when the door is closed.

[0095] In the parent door hanging side structure S1o, similarly to the child door hanging side structure S1k, the hanging side water stop member 11a is arranged on the protected side parent door hanging inner surface 18oa of the door frame 12 so that it abuts inside the opposing area with the door stop surface 17d of the parent door 13o when the door is closed, the arrangement position of the hanging side water stop member 11a is adjusted by a front-to-rear position adjustment mechanism so that the elastic seal body 22 is not in contact with the corner and is within the width at which it exhibits watertightness in normal times, and the hanging side edge 13oa is compressed toward the protected area approximately perpendicular to the abutment surface of the elastic seal body 22.

[0096] In this manner, the main door hanging side structure S1o is constructed by making the front-rear position adjustment mechanism function as a contact pressure adjustment means for adjusting the contact pressure of the hanging side water-stopping member 11a against the main door 13o.

[0097] In addition, at the door end side of the main door 13o, as shown in the lower diagrams of Figures 1 and 6, the joint portion circular curved surface water-stopping member 11b is arranged near the lower half of the door end side edge 13kb so as to be spanned upward from the door end side lower end of the child door 13k along the joint portion 26 to the door end side of the main door 13o, and is compressed between the door end side edge 13ob of the main door 13o by an easy closing pressure to form a joint upper water-stopping structure S2u.

[0098] Here, the structure of the joint portion circular arc curved surface water-stopping member 11b will be described with reference to Fig. 8. As shown in Fig. 8(a), the joint portion circular arc curved surface water-stopping member 11b is composed of a long arc-shaped outer plate 50 that is generally arc-shaped in cross section, an inner plate 51 that is also long and is disposed on a chord portion that is generally arc-shaped in cross section, and an elastic seal body 52 that is also long and has a trapezoidal shape in cross section.

[0099] The arc-shaped outer panel 50 is a member that forms the arc-shaped curved surface portion 50a that is characteristic of the appearance of the joint portion arc-shaped curved surface water-stopping member 11b, and in the joint lower part water-stopping structure S2d, the joint portion arc-shaped curved surface water-stopping member 11b is arranged on the door end side edge 13kb of the sub-door 13k so that this arc-shaped curved surface portion is convex toward the protected area to be fitted into the curved portion 27w of the lower frame water-stopping member 11c via the elastic seal body 22.

[0100] 8(b), the arcuate curved surface portion 50a is not a semicircular arc portion of the circumference of a circle Q1 centered on center P1. In other words, the arcuate curved surface portion 50a is an arcuate portion included on the protected area side of the circumference of a circle Q1 whose center P1 is closer to the flooded area than the protected area side surface of each door, and has a shape that follows the portion equivalent to the central angle α.

[0101] As a result, the angle βk formed by the tangent M1 to the end of the arc portion on the child door 13k side in a planar cross-sectional view of the arc curved surface portion 50a and the door surface on the protected area side of the child door 13k when the door is closed, and the angle βo formed by the tangent M2 to the end of the arc portion on the parent door 13o side and the door surface on the protected area side of the parent door 13o when the door is closed, are both obtuse angles, for example, obtuse angles of 100 degrees or more.

[0102] With this configuration, reliable watertightness can be ensured at the end of the arcuate curved surface portion 50a on the child door 13k side and the end on the parent door 13o side in a planar cross-sectional view.

[0103] As shown in FIG. 8(a), the arc-shaped outer panel 50 has a rib 50b along the long side of the arc-shaped curved surface portion 50a on the sub-door (first-closing door) side for attachment to the door-front edge 13kb of the sub-door 13k with a screw 19.

[0104] The inner panel 51 is a support plate arranged at a portion corresponding to the chord of the arc-shaped outer panel 50, and comprises an inner panel main body portion 51a for abutting the surface of the child door 13k, in this embodiment the smoke return portion 13kd, and fixing it with screws 19, and a sloped portion 51b arranged opposite and spanning the door-end side edge 13ob of the parent door 13o, and an elastic seal body 52 is arranged on the sloped portion 51b.

[0105] Here, as shown in Figure 8 (b), the inclined portion 51b is inclined so that the gap gradually widens from the door end side of the main door 13o to the hanging side, while the elastic seal body 52 is a trapezoidal elastic seal body when viewed in horizontal cross section so that when arranged along the inclined portion 51b, the surface facing the main door 13o becomes a surface that abuts approximately parallel when the door is closed.

[0106] In addition, the angle γ formed by an imaginary plane n1 including the abutment surface 52a of this elastic sealing body 52 with the lower frame water-stopping member 11c and an imaginary plane n2 parallel to the protected area side surface of the sub-door 13k when the door is closed in a non-water-submerged state is made smaller than angle βo (angle γ<angle βo).

[0107] With this configuration, compared to when angle γ is greater than or equal to angle βo, the buildup that bulges radially outward of the circle Q1 due to compression of the elastic seal body 52 by the parent door 13o can be firmly adhered to the elastic seal body 22 of the lower frame water-stopping member 11c, thereby ensuring solid watertightness in the lower part of the joint water-stopping structure S2d.

[0108] Furthermore, with this configuration, the elastic seal body 52 and the main door 13o can come into contact on substantially parallel planes, making it easier to compress the elastic seal body 52 and ensuring reliable watertightness.

[0109] In this embodiment, the elastic seal body 52 is trapezoidal in horizontal cross section, but it is also possible to use a rectangular elastic seal body 52. ​​Rectangular elastic seal materials are widely available commercially and are easy to obtain, and the inclined surface portion 51b allows the elastic seal body 52 to come into contact with the parent door 13o from the rectangular corner portion, making it easy to compress the elastic seal body 52 and ensuring reliable watertightness.

[0110] In the lower joint water-stopping structure S2d, the main door 13o is in contact with the elastic seal body 52 of the joint portion arc-curved surface water-stopping member 11b to the extent that it simply touches the elastic seal body 52, or is in a state where the elastic seal body 52 is not compressed but is in contact, or is compressed by about 0.1 mm to 0.2 mm.

[0111] In addition, the mounting position of the joint arc curved water-stopping member 11b, i.e., the protruding position of the elastic seal body 52 relative to the door 13 is adjusted so that the elastic seal body 52 generates a repulsive force that is smaller than the force of the door closer or the limit repulsive force that allows the door to be easily closed by hand due to pressure from the main door 13o when the door is closed in a non-waterlogged state (for example, the force from the door closer 16), and that sufficient watertightness can be exhibited when rotated within the range of rotation allowance described below in the event of flooding (easy to close in normal conditions / watertight when flooded).

[0112] In addition, as shown in the central upper diagram of Fig. 6, the gap d7 of the water-stopping structure S2u at the upper part of the joint also functions as a rotation allowance 24 for achieving watertightness when the door is closed in a flooded state. That is, in the water-stopping structure S2u at the upper part of the joint, when the door is closed in a non-flooded state, the parent door 13o is allowed to rotate so that the parent door 13o is in a state where the watertightness is achieved by the water pressure, that is, the elastic seal body 52 of the water-stopping member 11b at the joint is compressed to a compression threshold value or more for achieving watertightness. In this embodiment, the gap d7, which is the rotation allowance 24, is set to 1.5 mm.

[0113] Next, the lower frame side structure S3 will be described with reference to Figures 9 and 10. Figure 9(a) is an explanatory diagram of the parent door side lower frame structure S3o, partially omitting the Y1-Y1 cross section of Figure 1(b), and Figure 9(b) is an exploded explanatory diagram showing the vicinity of the lower frame 12c of Figure 9(a) with the parent door 13o omitted. Also, Figure 10 is an explanatory diagram of the joint lower part water stop structure S2d, partially omitting the Y2-Y2 cross section of Figure 1(b).

[0114] As mentioned above, the lower frame side structure S3 is constructed of the parent door side lower frame structure S3o as the rear closing door side lower frame structure, the child door side lower frame structure S3k as the first closing door side lower frame structure, and the joint lower water stopping structure S2d which also belongs to the joint portion water stopping structure S2.

[0115] As shown in Figure 9(a), the parent door side lower frame structure S3o is composed of a lower frame 12c of the door frame 12, a lower frame water-stopping member 11c arranged in the lower frame 12c, and a parent door bottom main part 13ocm of the parent door 13o, and its function is performed by the cooperation of these.

[0116] As shown in Figure 9(b), the lower frame waterproofing member 11c is composed of a long base member 30 that is bent into an approximately L-shape in cross section, a long support member 31 that is also approximately U-shaped in cross section, and an elastic seal body 22 that is also long and approximately rectangular in cross section.

[0117] The construction of the lower frame waterproofing member 11c is carried out in substantially the same manner as the construction of the hanging side waterproofing member 11a described above, by combining the base member 30, the support member 31 and the elastic seal body 22 while aligning them in the longitudinal direction.

[0118] The bottom frame waterproofing member 11c assembled in this manner is arranged on the protected side inner surface of the door frame 12, which is the surface of the bottom frame 12c part (hereinafter referred to as the protected side bottom frame inner surface 18c), as shown in Figures 9(a) and 9(b), and fixed with screws 19.

[0119] Further, an elongated screw hole 31b is formed in the bottom surface 31a of the support member 31 at a position facing the screw hole 30a provided in the base member 30, making it possible to easily adjust the attachment position of the elastic seal body 22 in the front-rear direction together with the support member 31 relative to the support member 31 and the lower frame 12c fastened by the screw 19. That is, the lower frame side structure S3 is also provided with a front-rear position adjustment mechanism, which is also configured to function as contact pressure adjustment means.

[0120] In addition, as a feature of the parent door side lower frame structure S3o, the elastic seal body 22 is configured to contact the door with a pressure gradient from the hanging side to the door end side, from the compression pressure at the hanging side structure to the compression pressure at the door end side structure. In the following explanation, such a structure is also called a pressure gradient structure.

[0121] The child door side lower frame structure S3k has a structure having a configuration substantially similar to the parent door side lower frame structure S3o, but does not have a pressure gradient structure, and the child door side straight portion 27k of the lower frame water-stopping member 11c arranged on the lower frame 12c is compressed at a pressure that exerts watertightness between the child door bottom main portion 13kcm of the child door 13k.

[0122] In addition, the installation position of the straight portion 27k on the child door side of the lower frame waterproofing member 11c, i.e., the protruding position relative to the child door 13k, is adjusted using the front-to-rear position adjustment mechanism so that the width of the elastic seal body 22 becomes width d5 ​​at which watertightness is sufficiently achieved.

[0123] In addition, the lower frame water-stopping member 11c is arranged on the protected side lower frame inner surface 18c of the door frame 12 so that it abuts inside the opposing area with the doorstop surface 17d of each door when the door is closed, thereby achieving more reliable water-stopping compared to when an elastic seal body 22 is placed on the doorstop surface 17d to achieve water-stopping.

[0124] In this manner, the child door side lower frame structure S3k is constructed by making the front-rear position adjustment mechanism function as a contact pressure adjustment means for adjusting the contact pressure of the child door side straight portion 27k against the child door 13k.

[0125] The water-stopping structure S2d at the bottom of the joint also has a structure having a configuration substantially similar to the parent door side lower frame structure S3o, but differs in that it does not have a pressure gradient structure like the child door side lower frame structure S3k.

[0126] In addition, the lower frame water-stopping member 11c constituting the joint lower water-stopping structure S2d, i.e., the curved portion 27w, is different in configuration in that it is formed as an arc-shaped mating recess as shown in Figures 6 and 10.

[0127] Specifically, as shown in Figure 10, in the joint lower water-stopping structure S2d, the elastic seal body 22 in the curved portion 27w of the lower frame water-stopping member 11c arranged on the lower frame 12c is compressed with a pressure that exerts water-tightness between the elastic seal body 22 and the arc-curved surface portion 50a of the joint portion arc-curved surface water-stopping member 11b arranged on the sub-door 13k.

[0128] In addition, in the joint lower water-stopping structure S2d, similar to the child door side lower frame structure S3k, the curved portion 27w of the lower frame water-stopping member 11c has its mounting position adjusted using a front-to-rear position adjustment mechanism so that the width of the elastic sealing body 22 becomes width d5 ​​at which watertightness is fully exhibited, i.e., the protruding position relative to the arc curved portion 50a of the joint portion arc curved surface water-stopping member 11b is adjusted.

[0129] In this way, the front-to-rear position adjustment mechanism functions as a contact pressure adjustment means for adjusting the contact pressure of the curved portion 27w against the arcuate curved surface portion 50a, thereby constructing a water-stopping structure S2d for the lower part of the inlet.

[0130] Another feature of the lower frame side structure S3 described above is that the elastic seal body 22 of the lower frame water-stopping member 11c is configured to contact the door at the parent door side straight section 27o with a pressure gradient from the hanging side to the door end side, from the compression pressure at the hanging side structure to the compression pressure at the door end side structure, and is configured to be compressed at a pressure that exhibits watertightness at the child door side straight section 27k and curved section 27w.

[0131] Fig. 11 is an explanatory diagram conceptually showing the compressed state of the elastic seal bodies 22, 52 arranged on the hanging side water stopper member 11a, the joining part curved surface water stopper member 11b, and the bottom frame water stopper member 11c when the door is closed in a non-water-submerged state. In this Fig. 11, the degree of compression of the elastic seal bodies 22, 52 in each water stopper member is shown by shading, and the greater the pressure received from the door 13 and the joining part curved surface water stopper member 11b and the greater the degree of compression, the darker the color (black), and conversely, the smaller the pressure received and the lower the degree of compression, the lighter the color (white).

[0132] The compressed state of the elastic seal body 22 in the sub-door hinge side structure S1k when the door is closed in a non-waterlogged state is a compressed state with the corner non-contact / normal watertight width d5 ​​= 9 mm as described above, and since this is a width that provides sufficient watertightness even when the door is closed in a non-waterlogged state, it is in a highly compressed state as shown in dark color (black) as shown in Figure 10.

[0133] In addition, the compressed state of the elastic seal body 22 in the parent door hinge side structure S1o when the door is closed in a non-waterlogged state is also compressed to a corner non-contact / normal watertight width d5 ​​= 9 mm, and since this is a width at which watertightness is fully exhibited when the door is closed in a non-waterlogged state, it is in a highly compressed state as shown in a dark color (black).

[0134] In addition, the compressed state of the elastic seal body 22 when the door is closed in a non-waterlogged state in the upper part of the door joint waterproof structure S2u of the door joint waterproof structure S2 is the easy-to-close state in normal times / watertight state when flooded, as described above, in which the parent door 13o is lightly abutted against the elastic seal body 22, and is in a low compression state as shown in a light color (white).

[0135] In addition, the compressed state of the elastic seal body 22 in the child door side lower frame structure S3k of the lower frame side structure S3 when the door is closed in a non-waterlogged state is a compressed state with a normal watertightness width d5 ​​= 9 mm, which is a width at which watertightness is fully exhibited when the door is closed in a non-waterlogged state, and therefore is in a highly compressed state as shown in a dark color (black).

[0136] In addition, when the door is closed in a non-waterlogged state in the parent door side lower frame structure S3o of the lower frame side structure S3, a pressure gradient is formed from the hanging side to the door end side, ranging from high compression (dark color) in the hanging side structure to low compression (light color) in the door end side structure.

[0137] Here, in order to explain the compression state at the intersection of the joining portion circular curved surface water stopper member 11b and the lower frame water stopper member 11c (reference symbol P2 portion indicated by an x ​​mark in the figure), another diagram is shown in the circled frame in Fig. 10. Reference symbol P2 portion is a state in which the elastic seal body 52 of the joining portion circular curved surface water stopper member 11b overlaps with the back side of the paper in Fig. 10, and the elastic seal body 22 of the lower frame water stopper member 11c overlaps with the front side of the paper, and the diagram in the circle shows the state at the overlapping portion by shifting the compression state by the elastic seal body 52 of the joining portion circular curved surface water stopper member 11b on the back side of the paper a little upward. The x mark in the diagram in the circle shows the part that is originally overlapped in the front-to-back direction of the paper, and does not show the pressure state.

[0138] As shown in the figure within the circular frame, in the lower joint watertight structure S2d, the elastic seal body 52 of the arc-curved watertight member 11b of the joint is in a normal easy-to-close / watertight state when flooded, similar to the compressed state in the upper joint watertight structure S2u, where the door 13 is lightly abutting against the elastic seal body 22, and is in a low compression state shown in a light color (white).

[0139] On the other hand, the elastic seal body 22 of the lower frame water-stopping member 11c is in a compressed state by the arc curved portion 50a at a corner non-contact / normal watertight width d5 ​​= 9 mm, similar to the compressed state in the child door side lower frame structure S3k, and since this is a width at which watertightness is sufficiently exhibited even when the door is closed in a non-waterlogged state, it is in a highly compressed state as shown in a dark color (black).

[0140] When considering the operability of opening and closing the watertight door device 10 equipped with such a watertight structure S in a non-waterlogged state, particularly the operability of the main door 13o which is intended for everyday use rather than the secondary door 13k which is normally fixed in place by the French drop 25, it would at first glance appear that the operability of opening and closing in normal times would be deteriorated, since the main door 13o is subjected to a strong repulsive force by the highly compressed elastic seal body 22 of the main door hanging side structure S1o.

[0141] However, the repulsive force from the elastic seal body 22 at the hanging side does not interfere with the closing operation due to the leverage, so the user performing the door closing operation does not feel an excessive weight.

[0142] In addition, the elastic seal body 52 of the joining portion circular arc curved surface water-stopping member 11b at the door end side of the main door 13o is in an easy-to-close state under normal circumstances and is in a watertight state when flooded, that is, it is in a state where it only lightly contacts the main door 13o, so that the user performing the door closing operation does not feel any excessive weight.

[0143] In addition, on the bottom frame 12c side, the elastic seal body 22 of the bottom frame side structure S3 forms a pressure gradient in the parent door side straight section 27o where the repulsive force becomes stronger from the door end side to the hanging side, but since the leverage action also occurs strongly from the door end side to the hanging side, it does not interfere with the door closing operation and the user performing the door closing operation does not feel excessive weight.

[0144] In this way, the waterproof structure S of this embodiment can be said to be a waterproof structure for realizing a waterproof door device 10 that does not require special force to close the door and is suitable for everyday use.

[0145] Next, the state of the door 13 when it is closed and water pressure is applied due to flooding is shown in Fig. 12. When water pressure due to flooding is applied to the door 13 as shown by the white arrow in the approximate center of the page, the parent door 13o rotates against the elastic force from the elastic seal body 52 of the arcuate curved surface water-stopping member 11b of the joint part due to the rotation allowance 24 shown in the center of the upper diagram of Fig. 6, and the gap disappears as shown by the symbol P3 in the circular frame in the upper diagram of Fig. 12, and it becomes obliquely accommodated in the door frame 12 (a state in which the door tip side is rotated further in the closing direction than parallel).

[0146] In this state, the main door hinge side structure S1o is almost the same as when the door is closed and not submerged in water, and since the watertightness is maintained, water is prevented from entering the protected area.

[0147] In the water-stopping structure S2u at the top of the entrance, the elastic seal body 52, which is in a state of being easily closed under normal circumstances and watertight when flooded, is compressed by water pressure through the parent door 13o. For example, in this embodiment, as shown in the upper circle in Fig. 12, the parent door 13o is compressed until it abuts against the smoke return part 13kd of the child door 13k, and the elastic seal body 52 is further compressed than the width d3 = 9 mm when the above-mentioned watertightness can be exhibited, and watertightness is exhibited and water intrusion into the protected area is prevented. For example, in this embodiment, the elastic seal body 52 is compressed 1.5 mm from the parent door 13o due to the rotation allowance 24 (d7 = 1.5 mm), and watertightness is exhibited.

[0148] At this time, in the inlet lower water-stopping structure S2d, the elastic seal body 22 of the lower frame water-stopping member 11c is compressed by the expansion of the elastic seal body 52, as shown in the circular frame in the above figure, and watertightness is exerted between the elastic seal body 22 and the elastic seal body 52.

[0149] In addition, as described above, the contact portion between the elastic seal body 22 and the arcuate curved surface portion 50a is in a compressed state with the corner non-contact / watertightness width in normal state d5 = 9 mm under normal circumstances, and watertightness is naturally maintained even when water pressure is applied.

[0150] As shown in Fig. 13, in the parent door side bottom frame structure S3o of the bottom frame side structure S3, the water stop structure S2d at the bottom of the joint has changed to a highly compressed state, so the pressure gradient structure from the hinge side to the end side of the parent door 13o changes from a highly compressed state where watertightness is exhibited to a highly compressed state where watertightness is also exhibited, and watertightness is exhibited in the left and right directions of the door 13, preventing water from entering the protected area. Note that the inside of the circle in Fig. 13 is an exploded view of the overlapping portion P4, similar to Fig. 11.

[0151] In other words, the waterproof structure S according to this embodiment can be said to be a waterproof structure that can realize the waterproof door device 10 without the need for prior installation work when in use.

[0152] The waterproof structure S of the closed double-opening door includes a joint water-stopping structure (e.g., joint water-stopping structure S2) that prevents water from entering through the joint portion (e.g., joint portion 26) of the first-closing door (e.g., the child door 13k) and the rear-closing door (e.g., the parent door 13o), a hanging water-stopping structure (e.g., the hanging side structure S1) that prevents water from entering through the gap between the door frames (e.g., the child door hanging side vertical frame 12k, the parent door hanging side vertical frame 12o) on the hanging side of each of the first-closing door and the rear-closing door, and a water-stopping structure (e.g., the hanging side structure S1) that prevents water from entering through the gap between the door frames (e.g., the child door hanging side vertical frame 12k, the parent door hanging side vertical frame 12o) on the hanging side of each of the first-closing door and the rear-closing door. By providing a bottom watertight structure (e.g., child door side bottom frame structure S3k, parent door side bottom frame structure S3o) that prevents water from entering through gaps in the door frames when the doors are closed, it is possible to ensure uniform watertightness by alleviating partial stress concentration when the doors are closed, and it is also possible to provide a double-leaf door watertight structure that is equipped with a joint watertight structure that can prevent partial deterioration of the elastic seal body (e.g., elastic seal body 22, 52) arranged in the watertight member (e.g., watertight member 11) and also provides watertightness with the door frames at the hanging sides and bottom sides of both doors.

[0153] Furthermore, if the angle (e.g., angle βk) formed by the tangent (e.g., tangent M1) to the front-closing door side end of the arc portion in a planar cross-sectional view of a circular arc curved water-stopping member (e.g., joint portion circular arc curved water-stopping member 11b) and the door surface on the protected area side when the front-closing door is closed, and the angle (e.g., angle βo) formed by the tangent (e.g., tangent M2) to the rear-closing door side end of the arc portion and the door surface on the protected area side when the rear-closing door is closed are each obtuse angles, then solid water-tightness of the front-closing door side end and rear-closing door side ends of the arc portion can be ensured.

[0154] In addition, the surface of the arc-curved water-stopping member facing the rear-closing door (for example, inner panel 51) is provided with an inclined surface (for example, inclined portion 51b) in which the gap gradually widens from the door end side of the rear-closing door to the hanging side, and by arranging a trapezoidal elastic sealing body (for example, elastic sealing body 52) on the inclined surface when viewed in cross section in the plan direction, the elastic sealing body can come into contact with the rear-closing door on an approximately parallel plane, making it easier to compress the elastic sealing body and ensuring solid watertightness.

[0155] This application also includes the following inventions. (C1) A waterproof structure that prevents water from entering through gaps in the door frame and gaps in the joint at least on the left and right lower three sides of a closed double-leaf door by using waterproof members arranged along the said edges and the joint, and that when the door is closed in a non-waterlogged state where the door is not subjected to water pressure, the hanging side waterproof member arranged in the hanging side vertical frame of the door frame is compressed with a pressure that exerts watertightness between the door and the hanging side structure, and when the door is closed in a non-waterlogged state, the joint part curved surface waterproof member arranged in the door end of the front-closing door that constitutes the joint part is compressed between the rear-closing door and the hanging side structure at a pressure equal to or less than the contact pressure that generates the limit of elasticity that allows the door to be easily closed by hand, or does not come into contact with the rear-closing door. and a lower frame side structure in which, when the door is closed in a non-waterlogged state, the lower frame water-stopping member arranged on the lower frame of the door frame comes into contact with or does not come into contact with the rear-closing door with a pressure gradient from the hanging side to the door end side from the compression pressure in the hanging side structure to the compression pressure in the joint water-stopping structure or a non-contact state, and further, the rear-closing door is allowed to rotate to compress the joint arc-curved water-stopping member to a state in which water-tightness is achieved by water pressure when the door is closed in a waterlogged state, thereby providing a water-stopping structure that does not require prior installation work when used and does not require special force to close the door, making it suitable for everyday use.

[0156] (C2) Furthermore, each of the water-stopping members is disposed on the door frame so as to abut on the inside of the area of ​​the door facing the door stop of the door frame when the door is closed in a flooded state, thereby more reliably preventing water from entering the door.

[0157] (C3) Furthermore, the hanging side water stop member is disposed at a position on the door end side orientation surface of the hanging side vertical frame that does not come into contact with the hanging side corner when the door is opened or closed, thereby preventing deterioration of the hanging side water stop member due to contact with the corner of the door.

[0158] (C4) Furthermore, since a contact pressure adjusting means is provided for adjusting the contact pressure of each of the water-stopping members against the door, the contact pressure between each of the water-stopping members and the door can be easily adjusted.

[0159] As described above, the water-stopping structure for the joint of this embodiment comprises a curved arc water-stopping member arranged convexly on the protected area side so as to span from the lower end of the door edge of the first-closing door along the joint upward to the door edge of the rear-closing door, and an arc-shaped fitting recess formed in the lower frame of the door frame into which the vicinity of the lower end of the curved arc water-stopping member fits via an elastic seal when the first-closing door is closed.This makes it possible to provide a water-stopping structure for the joint that can alleviate partial stress concentration when the door is closed, ensuring uniform water-tightness and preventing partial deterioration of the elastic seal arranged in the water-stopping member.

[0160] Finally, the above-mentioned embodiments are merely examples of the present invention, and the present invention is not limited to the above-mentioned embodiments. Therefore, even if the above-mentioned embodiments are different, various modifications can be made depending on the design, etc., as long as they do not deviate from the technical idea of ​​the present invention. [Explanation of symbols]

[0161] 10. Watertight door device 11 Water-stopping materials 12 Door frame 13 Door 13k Child door 13o Main Door 22 Elastic seal body 24 Rotation allowance 26 Meeting Section 27w curved part 50 Circular shell 50a Circular curved surface 51b Slope section 52 Elastic seal body βk angle βo angle M1 tangent M2 tangent S Water stop structure S1 Hanging side structure S2 Sealing part water stop structure S3 Lower frame structure

Claims

1. In the waterproof structure of the joint of closed double-leaf doors, The door is then fitted with a protective cover to protect the door from the elements. a fitting recess having an overall arc-shaped curved portion formed in the lower frame of the door frame into which the arc-shaped curved surface portion near the lower end portion of the arc-shaped water-stopping member is fitted via an elastic seal body when the first-closing door is closed; A waterproof structure for a joint, characterized in that the arc portion of the arc curved surface portion when viewed in cross section in the planar direction is an arc portion that is included on the protected area side of a circumference of a circle whose center is closer to the water-submerged area than the protected area side surface of each door.

2. an angle formed by a tangent to an end of the first-closing door side of the arcuate portion of the arcuate curved surface of the arcuate curved surface water-stopping member in a cross-sectional view in a planar direction and a surface of the first-closing door on the protection area side when the first-closing door is closed; A water-stopping structure for a joint as described in claim 1, characterized in that the angles formed by the tangent to the rear closing door side end of the arc portion and the door surface on the protective area side when the rear closing door is closed are each obtuse angles.

3. A water-stopping structure for a joint as transferred in claim 1, characterized in that the surface of the arc-curved water-stopping member facing the rear-closing door has a sloping surface in which the gap gradually widens from the door end side to the hanging side of the rear-closing door, and a trapezoidal elastic seal body is arranged on the sloping surface when viewed in cross section in the planar direction.

4. A waterproof structure for a closed double door, The water-stopping structure of claim 1 prevents water from entering through the joint between the front and rear closing doors; A water-stopping structure at the hanging base that prevents water from entering through gaps in the door frame at the hanging base sides of the front-closing door and the rear-closing door; A bottom water-stopping structure that prevents water from entering through gaps in the door frame at the bottoms of the front-closing door and the rear-closing door; A waterproof structure for a double-opening door, comprising:

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