JP2010133174A - Underfloor ventilation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide ventilation of an underfloor space by surely preventing the intrusion of rainwater into the underfloor space even when a strong wind blows. <P>SOLUTION: Wall frames 2 are sequentially erected by forming a ventilation passage S between the upper surface and undersurface of a foundation 1; an approximately Z-shaped cross-section seal member 6, in which a plurality of air vents 6a are formed at longitudinal spacings in a web 63, is attached to a mounting bracket 4; and subsequently, the mounting brackets 4 fitted with the seal member 6 are fixed to the wall frames 2 in order, respectively. In this case, a lower flange portion 62 of the seal member 6 adheres to the upper surface of the foundation 1, and a leading end thereof is protruded outward from an outside corner portion of the foundation 1. After that, a foundation drainboard 5, which has an inward draining portion 56 continuously provided at a lower end, is fixed to the mounting bracket 4. Thus, even when the rainwater is blown up by running around the foundation drainboard 5 by a typhoon etc., the intrusion of the rainwater is prevented because the draining portion 56 of the foundation drainboard 5 and a leading end of the lower flange portion 62 of the seal member 6 make a projected opening area as small as possible. <P>COPYRIGHT: (C)2010,JPO&INPIT

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 hanging length of the foundation drainer from the height position of the top end surface of the foundation 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 comprises a plurality of wall frames that are erected by forming a ventilation passage between the top end surface of the foundation and a lower surface, a plurality of mounting brackets that are fixed to the wall frame at a set interval, A basic drainer connected to the metal fitting, and a seal member having a substantially Z-shaped cross-section, which is attached to the metal fitting and has a plurality of ventilation openings formed at intervals in the longitudinal direction on the web portion connecting the upper and lower flange portions. The foundation drainer has a downwardly inclined drainage inward at the lower end below the height of the top end surface of the foundation, and the lower flange of the seal member is at the tip. The part protrudes from the outer corner of the foundation and is closely attached to the top end face of the foundation.

  According to the present invention, outside air passes through the drainage portion of the foundation drainer and the tip of the lower flange portion of the seal member protruding outward from the corner corners of the foundation, and passes through the ventilation port and the ventilation passage of the seal member to provide the underfloor space. It is possible to ventilate the space under the floor. On the other hand, even under strong winds such as typhoons, even if rainwater is blown up to the inner surface of the foundation drainer, the drainage part of the foundation drainer connected inward and the outer corner of the foundation outward The tip of the lower flange part of the seal member protruding in the shape of a projecting step in the space between the inner surface of the foundation drainer and the outer surface of the foundation reduces the projected opening area as much as possible. Therefore, it is possible to reliably prevent rainwater from entering further upward. Also, even if rainwater sprayed on the outer surface of the foundation is pushed up along the outer surface, the lower flange of the seal member with the tip protruding outward from the corner of the foundation is the top end surface of the foundation. By adhering closely to, it is possible to reliably prevent further intrusion of rainwater.

  Therefore, even if the drooping length of the foundation drainer from the height position of the top edge of the foundation is shortened, it is ensured that rainwater enters the underfloor space through the ventilation passage or under the strong wind. Can be 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.

  According to the present invention, even when the drooping length of the foundation drainer from the height position of the top end surface of the 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 and 2 show an embodiment of the underfloor ventilation structure of the present invention.

  The underfloor ventilation structure includes a foundation 1, a wall frame 2 standing on the foundation 1, an outer wall panel 3 fixed to the wall frame 2, and a plurality of frames connected to the wall frame 2 at appropriate intervals. The mounting bracket 4, a long foundation drainer 5 connected to the mounting bracket 4 and disposed below the outer wall panel 3, and a long sealing member that is mounted on the mounting bracket 4 and seals the top end surface of the foundation 1. 6.

  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. 2, the mounting bracket 4 includes a mounting drooping portion 41, a horizontal portion 42 that is continuously provided outward from the lower end edge of the mounting drooping portion 41, and a connection that is continuously provided downward from the leading edge of the horizontal portion 42. Part 43, horizontal support part 44 provided outward from the lower end edge of connection part 43, and hanging support part 45 provided downward from the front end edge of horizontal support part 44, and bending the steel plate Is formed. The mounting bracket 4 is attached to a bolt bracket 7 (see FIG. 1) inserted in the gap between the left and right vertical bars 22 in the adjacent wall frame 2 with the mounting hanging portion 41, and a nut is screwed into the bolt bracket 7. It is fixed by.

  In addition, a cut and raised piece 421 is formed in the horizontal portion 42 of the mounting bracket 4, and by inserting a tip end edge portion of an upper flange portion 61 of a seal member 6 described later between the back surface of the horizontal portion 42, The seal member 6 can be held.

  The base drainer 5 is continuously provided with a downward slope from the vicinity of the upper end edge of the horizontal support portion 51, the inner hanging portion 52 connected upward from the front end edge of the horizontal support portion 51, and the inner hanging portion 52. The inclined portion 53, the outer hanging portion 54 continuously provided downward from the front end edge of the inclined portion 53, the mounting recess 55 projecting inwardly at the substantially middle portion of the outer hanging portion 54, and the outside. It has a water return portion 56 that is continuously provided with a downward gradient from the vicinity of the lower end edge of the hanging portion 54 toward the inside, and is formed by extrusion molding of aluminum. And the horizontal support part 51 of the foundation drainer 5, the outward hanging part 54, and the attachment recessed part 55 respond | correspond to the outer surface shape of the horizontal part 42 of the attachment metal fitting 4 mentioned above, the hanging support part 45, the connection part 43, and the horizontal support part 44. It is formed to have an inner surface shape.

  In addition, the water return part 56 of the foundation drainer 5 is set so as to be continuously provided from a position lower than the height position of the top end face of the foundation 1 when the foundation drainer 5 is connected to the mounting bracket 4.

  The seal member 6 is provided continuously between the upper and lower flange portions 61 and 62 and the end edges of the upper and lower flange portions 61 and 62, and has a plurality of long hole-like ventilation ports 6a spaced in the longitudinal direction. Is formed in a substantially Z-shaped cross section by a soft plastic such as rubber. Then, the seal member 6 is attached by inserting the tip edge portion of the upper flange portion 61 into the cut-and-raised piece 421 of the mounting bracket 4 and mounting it.

  Here, when the mounting bracket 4 to which the seal member 6 is attached is fixed to the wall frame 2, the seal member 6 is deformed slightly by being compressed in the vertical direction with the lower flange portion 62 pressed against the top end surface of the foundation 1. The lower flange portion 62 is pressed against and closely contacts the top end surface of the foundation 1 by the elastic force accompanying the deformation of the seal member 6, and the tip portion is set to protrude from the outer corner of the foundation 1. .

  A heat insulating material 9 and a floor material 10 are laid in order on the inner surface side of the foundation 1 by using a steel pulling 8 supported via a steel bundle, and a wall frame on the floor material 10. 2, an inner wall 11 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 9 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 a beam connecting member is erected between adjacent steel beams. 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, the mounting bracket 4 in which the front end edge of the upper flange portion 61 of the seal member 6 is attached to the bolt bracket 7 inserted between the left and right vertical bars 21 of the adjacent wall frame 2 on the first floor in advance. The mounting hanging portion 41 is inserted, and a nut is screwed into the bolt metal fitting 7 to fix the attachment metal fitting 4. At this time, the lower flange portion 62 of the seal member 6 is pressed against and closely contacts the top end surface of the foundation 1, and its tip portion projects outward from the outer corner of the foundation 1. Next, the inner surfaces of the horizontal support portion 51, the mounting recess portion 55, and the outer hanging portion 54 of the basic drainer 5 are in close contact with the outer surfaces of the horizontal portion 42, the connecting portion 43, the horizontal support portion 44, and the hanging support portion 45 of the mounting bracket 4. Thus, the tapping screw is screwed from the mounting recess 55 of the foundation drainer 5 toward the connecting portion 43 of the mounting bracket 4 to connect the foundation drainer 5 to the mounting bracket 4.

  Then, after fixing the outer wall panel 3 to the wall frame 2 on the first floor, the caulking material 12 and the sealing material 13 (see FIG. 1) are sequentially filled between the lower end surface of the outer wall panel 3 and the inclined portion 53 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 of the foundation drainer 5 from the height position of the top end surface of the foundation 1 is shortened, rainwater enters the underfloor space under strong winds. Can be reliably prevented. That is, even if rainwater is blown up under the strong wind such as a typhoon, the drainage portion 56 of the foundation drainer 5 and the outer corners of the foundation 1 that are continuously provided inward are provided. Projection opening area in which the tip end portion of the lower flange portion 62 of the seal member 6 protruding outward from the portion protrudes with a step difference in the space between the inner surface of the foundation drainer 5 and the outer surface of the foundation 1 By making as small as possible, rainwater can be prevented from entering further upward. Further, even if rainwater sprayed on the outer surface of the foundation 1 is pushed up along the outer surface, the lower flange portion 62 of the seal member 6 is in close contact with the top end surface of the foundation 1, so that the flange 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, outside air flows around the tip of the drainage portion 56 of the foundation drainer 5 and the lower flange portion 62 of the seal member 6 that protrudes outward from the outer corner of the foundation 1. Since it communicates with the underfloor space through the ventilation opening 6a and the ventilation passage S, the underfloor space can be ventilated, and adverse effects on the flooring can be prevented and used for a long period of time.

  By the way, the basic drainer 5 can be deformed corresponding to the thickness of the wall panel 3. For example, as shown in FIG. 3, the base drainer 5 has an inward hanging portion 52 continuously provided upward from the tip edge of the inclined portion 53 so as to contact the outer surfaces of the left and right vertical rails 21 of the wall panel 2. Alternatively, the horizontal support portion 51 may be continuously provided inward from the mounting recess 55 and placed on the outer surface of the horizontal portion 42 of the mounting bracket 4.

  In the above-described embodiment, the case where the mounting bracket 4 is fixed using the bolt bracket 7 inserted between the left and right vertical bars 21 of the adjacent wall frame 2 is illustrated, but the embodiment is limited to the bolt bracket 7. Instead, for example, a clip may be used for one-touch attachment.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foundation 2 Wall frame 3 Wall panel 4 Mounting bracket 5 Foundation drainer 56 Drainage part 6 Seal member 6a Ventilation port 61,62 Flange part 63 Web part S Ventilation passage

Claims (1)

  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 A basic drainer, and a seal member having a substantially Z-shaped cross section, which is mounted on a mounting bracket and has a plurality of ventilation openings formed at intervals in the longitudinal direction on the web portion where the upper and lower flange portions are continuously provided. The foundation drainer is provided with a downwardly inclined drainer inward at the lower end below the height position of the top end surface of the foundation, and the sealing member has a lower flange portion with the tip at the base. An underfloor ventilation structure characterized in that it projects from the outer corners and is in close contact with the top edge of the foundation.

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