JP4998446B2 - Underfloor ventilation structure - Google Patents

Description

  The present invention relates to an underfloor ventilation structure.

  Generally, a ventilation opening is formed in the foundation, air is circulated through the underfloor space, and the moisture in the underfloor space is discharged to the outside to prevent corrosion of flooring materials, steel frames and various hardware that are placed under the floor. Has been done. However, in order to form a ventilation opening in the foundation, special reinforcement is required around the ventilation opening to compensate for the strength reduction of the foundation, or there is a special formwork for forming the ventilation opening when placing concrete. There is a problem that it becomes necessary and the construction becomes complicated.

For this reason, a gap (ventilation passage) is formed between the top end surface of the foundation and the lower end surface of the outer wall panel, and ventilation of the underfloor space is performed using this ventilation passage (for example, Patent Documents). 1 and 2).
JP 2007-205089 A JP 2007-285067 A

  By the way, in the underfloor ventilation structure described above, in order to prevent rainwater from entering the ventilation passage, a foundation drainer is provided vertically at the lower end of the outer wall panel. Here, if the height of the foundation drainer is shortened in consideration of the appearance and harmony with the outer wall panel, the drooping length from the height position of the top end surface of the foundation drainer foundation will be shortened. Under strong winds such as typhoons, rainwater blows up around the bottom edge of the foundation drainer, or rainwater is pushed up along the outer surface of the foundation, and rainwater may enter the underfloor space through the ventilation passage. is there. When rainwater enters the underfloor space, the underfloor space becomes highly humid and, as described above, adversely affects the flooring material and the steel frame.

  The present invention has been made in view of such a problem, and even when the drooping length from the height position of the top end surface of the foundation draining base is short, the rainwater under the strong wind is introduced into the underfloor space. It is an object of the present invention to provide an underfloor ventilation structure capable of reliably preventing intrusion and ventilating an underfloor space.

  The present invention includes a plurality of wall frames that are erected by forming a ventilation passage between the bottom surface of the top end surface of the foundation, a plurality of mounting brackets that are fixed to the wall frame at a set interval, A base drainer that is connected to the metal fittings and has a plurality of ventilation holes formed in the lower side at intervals in the longitudinal direction, and a seal member attached to the tip of the base drainer adjacent to the upper edge of the outer surface of the foundation The seal member has a lip portion that is in close contact with the top end surface and the outer surface of the foundation.

  According to the present invention, the underfloor space is communicated with the outside air through the ventilation opening formed between the foundation drainer vent and the top end surface of the foundation and the lower surface of the wall frame, thereby ventilating the underfloor space. be able to. On the other hand, even under strong winds such as typhoons, even if rainwater blows up around the bottom edge of the foundation drainer and enters through the ventilation port on the lower side, the main body of the seal member is attached to the foundation drainer mounting part. By raising, it can prevent exceeding the main-body part of a sealing member. Further, even if rainwater sprayed on the outer surface of the foundation is pushed up along the outer surface, the lip portion of the seal member is in close contact with the upper edge of the outer surface and the outer edge of the top surface of the foundation. Thus, further infiltration of rainwater can be prevented by the lip portion.

  In this way, even if the drooping length from the height position of the top edge of the foundation draining foundation is shortened, rainwater intrudes into the underfloor space through the ventilation passage or under the strong wind. It can be surely prevented. Thereby, in order to aim at harmony with an outer wall panel, or in order to aim at the appearance improvement, it becomes possible to shorten the height of a foundation drainer.

  In the present invention, it is preferable that the seal member has a height that substantially reaches a height position of a ventilation passage formed between the lower surface of the wall frame and the top end surface of the foundation. As a result, the main body of the seal member can be raised so as to block the ventilation passage, complicating the wind passage, and even if rainwater is blown up through the ventilation opening, it can penetrate the ventilation passage beyond the seal member. It can prevent more reliably.

  According to the present invention, even when the drooping length from the height position of the top end surface of the foundation draining foundation is short, it is possible to reliably prevent rainwater from entering the underfloor space under strong wind and to ventilate the underfloor space. Can be achieved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show an embodiment of the underfloor ventilation structure of the present invention.

  The underfloor ventilation structure is secured to the base 1, a plurality of wall frames 2 erected on the base 1, an outer wall panel 3 fixed to the wall frame 2, and the wall frame 2 at appropriate intervals. A plurality of mounting brackets 4, a long foundation drainer 5 connected to the mounting bracket 4 and disposed below the outer wall panel 3, and a foundation 1 and a foundation drainer 5 attached to the tip of the foundation drainer 5. It is comprised from the sealing member 6 which seals between.

  The wall frame 2 is formed into a rectangular frame by left and right vertical bars 21 and upper and lower horizontal bars 22 made of lip groove steel having a substantially C-shaped cross section, and an intermediate beam (not shown) is interposed between the left and right vertical bars 21. It has a brace that is formed in an arrangement and spanned in an X shape as required. The wall frame 2 is welded with reinforcing plates (not shown) on the upper and lower ends of the left and right vertical bars 21, respectively, and these reinforcing plates are fixed to the anchor bolts of the foundation 1 with nuts, and the second floor. The wall frame 2 is fixed between the foundation 1 and the steel beam by fixing it to a steel beam or the like constituting the floor beam via a bolt and nut. Furthermore, the left and right wall frames 2 are connected to each other by fixing the adjacent vertical bars 21 in the wall frames 2 adjacent to the left and right via bolts and nuts. As a result, a gap having a height corresponding to the thickness of the reinforcing plate is formed between the top end surface of the foundation 1 and the lower surface of the lower horizontal rail 22 in the wall frame 2. The underfloor space on the side and the outside air on the outer surface side thereof can communicate with each other.

  The outer wall panel 3 is an extrusion-molded cement board, and is fixed to the wall frame 2 via a fixing bracket (not shown).

  As shown in FIG. 3, the mounting bracket 4 includes an outer hanging portion 41, an inner hanging portion 42, and an upper side portion 43 and an upper side portion 43 that are connected to upper end edges of the outer hanging portion 41 and the inner hanging portion 42. It is bent so as to have a convex portion 44 protruding upward, and its inner hanging portion 42 is fixed to the outer surface of the lower horizontal rail 22 in the wall frame 2 via screws. Here, the convex portion 44 of the mounting bracket 4 is formed so that the upper surface thereof is substantially in contact with the lower end surface of the outer wall panel 3 fixed to the wall frame 2.

  As shown in FIG. 3, the base drainer 5 is continuously provided downward from the fastening part 51, the upper side part 52 continuously provided outward from the lower end edge of the fastening part 51, and the outer edge of the upper side part 52. A long portion having a hanging portion 53 and a lower side portion 54 provided inward from the vicinity of the lower end edge of the hanging portion 53, a mounting portion 55 and a draining portion 55 provided in a continuous manner upward and downward from the tip edge of the lower side portion 54, respectively. The fastening part 51, the upper side part 52, and the hanging part 53 are the outer half parts of the mounting bracket 4, specifically, the convex part 44, the upper side part 43, and the outer hanging part 41. It is formed to have an inner surface shape corresponding to the outer surface shape. A plurality of long holes 5a are formed in the lower side portion 54 of the basic drainer 5 at set intervals in the longitudinal direction. In addition, the drooping part 53 of the basic drainer 5 has a lower edge at the lower side so that when rainwater flowing down the outer wall panel 3 reaches the drooping part 53, it does not enter and enter the ventilation port 5a of the lower side part 54. It is suspended below the part 54.

  As shown in detail in FIG. 2, the seal member 6 includes a main body portion 61 having a substantially U-shaped cross section that can be mounted on the mounting portion 55 of the basic drainer 5 described above, and obliquely rearward and diagonally downward on the back side of the main body portion 61. Are formed of a soft plastic such as rubber. The plurality of lip portions 62 of the seal member 6 are set so as to be disposed over the outer corners of the foundation 1. That is, the lip portion 62 extending diagonally rearward is closely attached to the outer edge of the top end surface of the foundation 1, and the plurality of lip portions 62 extending obliquely downward are The tip is formed so as to be in close contact with the upper edge of the outer surface of the foundation 1. Further, the seal member 6 is formed at such a height that the upper edge thereof reaches the substantially upper surface of the ventilation passage S, that is, the substantially lower surface of the wall frame 2 when the main body portion 61 is attached to the attachment portion 55 of the basic drainer 5. ing.

  In addition, on the inner surface side of the foundation 1, a heat insulating material 8 and a floor material 9 are laid in order using a steel pulling 7 supported via a steel bundle, and a wall frame on the floor material 9. 2, an inner wall 10 is erected (see FIG. 1). In this case, a certain gap is secured as a ventilation passage S between the lower surface of the heat insulating material 8 and the top end surface of the foundation 1.

  Next, the point which constructs the underfloor ventilation structure comprised in this way is demonstrated.

  First, the wall frame 2 is arranged on the foundation 1 and fixed via anchor bolts and nuts, and the adjacent wall frames 2 are fixed to each other via bolts and nuts. In addition, a steel beam (not shown) is arranged on the wall frame 2 fixed to the foundation 1 and fixed through bolts and nuts, and a steel beam or beam connecting member is installed between adjacent steel beams, and the floor beam on the second floor is installed. Form. Next, similarly, the wall frame 2 is fixed to the floor beam on the second floor, and the adjacent wall frames 2 are fixed to each other, and then the shed beam is fixed on the wall frame 2 on the second floor to form a steel structure. To do.

  On the other hand, after the inner hanging portion 42 of the mounting bracket 4 is arranged and set on the outer surface of the lower horizontal bar 22 on the first floor wall frame 2 with a set interval, the main body portion 61 of the seal member 6 is previously attached to the mounting portion 55. Attach the fastening part 51, the upper side part 52 and the hanging part 53 of the basic drainer 5 to which the knives are attached so as to be in close contact with the convex part 44, the upper side part 43 and the outer hanging part 41 of the mounting bracket 4, respectively. Connect and fix. At this time, the lip portion 62 of the sealing member 6 is disposed so as to be in close contact with the top end surface outer edge portion and the outer surface upper edge portion of the foundation 1.

  Then, after fixing the outer wall panel 3 to the wall frame 2 on the first floor, the caulking material 11 and the sealing material 12 (see FIG. 1) are sequentially filled between the lower end surface of the outer wall panel 3 and the upper side portion 52 of the foundation drainer 5. Then, water is stopped between the outer wall panel 3 and the foundation drainer 5.

  According to the underfloor ventilation structure configured in this way, even if the drooping length from the height of the top end surface of the foundation 1 of the foundation drainer 5 is shortened, rainwater enters the underfloor space under strong winds. Can be reliably prevented. That is, even under strong winds such as a typhoon, even if rainwater is blown up around the bottom edge of the foundation drainer 5 and enters the foundation drainer 5 through the ventilation port 5a of the lower side 54, the main body 61 of the seal member 6 Is mounted on the mounting portion 55 of the basic drainer 5 and is raised so as to block the ventilation passage S, it is possible to prevent the main body portion 61 of the seal member 6 from being exceeded as much as possible. Further, even if rainwater sprayed on the outer surface of the foundation 1 is pushed up along the outer surface, the lip portion 62 of the seal member 6 is provided at the upper edge of the outer surface of the foundation 1 and the outer edge of the top surface. Due to the close contact, the lip portion 62 can prevent further intrusion of rainwater. Therefore, it is possible to shorten the height of the basic drainer 5 in consideration of appearance and harmony with the outer wall panel.

  On the other hand, in a normal climate, the underfloor space is communicated with the outside air through the ventilation opening 5a of the basic drainer 5 and the ventilation passage S, so that the underfloor space can be ventilated, which has an adverse effect on floor materials and the like. It can be prevented and used for a long time.

  In the above-described embodiment, the case where the mounting bracket 4 is screwed to the lower horizontal rail 22 of the wall frame 2 has been illustrated. However, the present invention is not limited to screwing, for example, using a clip or the like. You may make it attach with one touch.

It is a longitudinal cross-sectional view which shows one Embodiment of the underfloor ventilation structure of this invention. It is the A section enlarged view of FIG. FIG. 2 is a partially exploded perspective view showing the underfloor ventilation structure of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foundation 2 Wall frame 3 Wall panel 4 Mounting bracket 5 Foundation drainer 5a Ventilation port 6 Sealing member 61 Main part 62 Lip part S Ventilation passage

Claims (2)

  Connected to the mounting brackets, a plurality of wall frames standing upright by forming a ventilation passage between the top end surface of the foundation and the lower surface, a plurality of mounting brackets fixed to the wall frame at set intervals And a base drainer in which a plurality of ventilation holes are formed at intervals in the longitudinal direction on the lower side, and a seal member attached to the tip of the basic drainer adjacent to the upper edge of the outer surface of the foundation, The underfloor ventilation structure, wherein the seal member has lip portions that are in close contact with the top end surface and the outer surface of the foundation.   2. The underfloor ventilation structure according to claim 1, wherein the seal member has a height that substantially reaches a height position of a ventilation passage formed between the lower surface of the wall frame and the top end surface of the foundation. .

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