JP2000054514A - Underfloor ventilation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underfloor ventilation structure capable of executing underfloor ventilation on the upper part of a strip footing, preventing the incursion of rain water, preventing insects from going in and out and, at the same time, also lowering the height of a footing. SOLUTION: A ventilation flue below the floor is formed between outside and inside throating materials 21 and 31. The inside throating material 31 is equipped with a vertical plate section 32 fixed to the outside of a sill, an oblique side 33 along the upper surface of a footing and a vertical side 34 along the outside surface of the footing, and a vent hole 35 connecting below the floor is provided to the vertical plate section 32. The outside throating material 21 is equipped with cover sides 23a, 23b and 23c forming the ventilation flue between a fixed side 22 fixed to the upper edge of the vertical plate section of the inside throating material 31 and the outside of the inside throating material. An insect control wire netting 41 is provided to the inside of the ventilation flue.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor ventilation structure, and more particularly to an underfloor ventilation structure capable of performing underfloor ventilation of a building at a base portion above a foundation.

[0002]

BACKGROUND OF THE INVENTION Usually,
Ventilation under the floor of a building is performed by providing a ventilation hole having a predetermined opening area at an appropriate height position on a cloth foundation. However, in this structure, ventilation holes must be formed at the same time when the fabric foundation is constructed, which is not only troublesome but also requires ventilation holes at a certain height from the ground to avoid the effects of wind and rain. Because of the necessity of the provision, the height of the cloth foundation had to be higher than required strength.

Accordingly, the present invention can provide ventilation under the floor above the foundation (cloth foundation), thereby preventing rainwater from entering, preventing insects from coming in and out, and lowering the height of the foundation. It is intended to provide a ventilation structure.

[0004]

In order to achieve the above object, the underfloor ventilation structure according to the present invention is characterized in that a base drainer provided on the outside of the base at the lower end of the outer wall is provided with an external drainer on the outer side and an internal drainer on the inner side. The inner draining material is formed of a vertical plate portion fixed to the outer surface of the base, a hypotenuse extending from the lower end of the vertical plate along the upper surface of the base, and a base plate extending from the outer end of the hypotenuse to the base. It has a drooping side that hangs down along the outer surface, and the external draining material is fixed to the upper edge of the vertical plate portion of the internal draining material, and from the lower end of the fixed side outward and A vertical plate portion of the internal drainer having a cover side extending downward to form a predetermined ventilation passage between its inner surface and the outer surface of the internal drainer and between the lower edge thereof and the outer surface of the foundation. A ventilation opening communicating the ventilation passage with the underfloor is formed at the It is characterized in that a insect wire mesh into the passageway.

Further, in the underfloor ventilation structure of the present invention, a folded side bent upward on the inner side is provided at a lower end portion of the covering side of the external draining member, and a base side of the insect repellent wire mesh is provided with the internal draining member. It is characterized in that it is fixed to the oblique side and its tip is engaged with the folded side. Also,
The hypotenuse portion of the internal drainage material, the lower hypotenuse portion along the upper surface of the foundation, the water return side that rises obliquely outward from the inner end of the lower hypotenuse portion, and the upper end of the water return side It is characterized in that it is formed by an upper oblique side portion connected to a lower end of the vertical plate portion.

[0006]

FIG. 1 is a longitudinal sectional view showing one embodiment of the underfloor ventilation structure of the present invention, and FIG. 2 is a perspective view of the same. The underfloor ventilation structure shown in the present embodiment is provided on the outer side of the building between the cloth foundation 11 and the outer wall 12, and is formed by the outer drainer 21 on the outer side of the building and the inner drainer 31 on the inner side. ing.

A plurality of base pieces 13 made of channel steel having a predetermined size are provided on the upper surface of the cloth foundation 11 at appropriate intervals in the longitudinal direction on the base portion corresponding to the underfloor ventilation structure construction position. A joist 14 or the like is fixed on the piece 13, and a column or the like is attached to the joist 14 in the same manner as in the related art.

The internal drainer 31 is formed by bending a thin metal plate into a predetermined shape, and has a vertical plate portion 32 fixed to the outer surface of the base and a lower end of the vertical plate portion 32 extending along the upper surface of the foundation. And a drooping side 3 extending downward from the outer end of the hypotenuse 33 along the outer surface of the foundation.
4, and a ventilation hole 35 is provided at an appropriate position of the vertical plate portion 32. Further, the hypotenuse portion 33 is
A lower oblique side 33a along the foundation upper surface, a water return side 33b rising obliquely outward from an inner end of the lower oblique side 33a, and the vertical plate portion 32 extending from an upper end of the water return side 33b. And an upper oblique side 33c connected to the lower end of the upper side.

The outer drainer 21 is made of a thin metal plate similarly bent and formed, and has a fixed side 22 fixed to the upper edge of the vertical plate portion 32 of the inner drainer 31 and a fixed side 22. And a cover side extending outwardly and downwardly from the lower end of the base member to form a predetermined ventilation passage between the inner surface thereof and the outer surface of the internal drainage member 31 and between the lower end edge thereof and the outer surface of the foundation. I have. The covering side includes a covering side horizontal plate portion 23a that forms the insertion groove 16 of the packing material 15 with the lower edge of the outer wall 12, and a covering side vertical plate portion 23b that is parallel to the foundation outer surface.
And an oblique side 23c between the two. Further, at the lower end of the covering side vertical plate portion 23b, there is provided a folded side 24 bent upward inside.

In addition, an insect repellent wire net 41 is provided in a ventilation passage between the covering side vertical plate portion 23b and the hanging side 34.
The insect-preventing wire mesh 41 has its base side 41a fixed to the hypotenuse 33 of the internal drainer 31 with screws 42,
The tip side 41b is the folded side 24 of the covering side vertical plate portion 23b.
Is engaged.

In the underfloor ventilation structure thus formed, air for underfloor ventilation is supplied between the tip of the external drainer 21 and the outer surface of the foundation, the inner surface of the external drainer 21 and the inner drainer 3.
1 and enters and exits under the floor through the ventilation hole 35 of the vertical plate portion 32 between itself and the outer surface. In addition, rainwater is prevented from entering the ventilation passage by the external drainer 21, and even when rain is blown by the wind, the water draining side 33 b of the internal drainer 31 prevents entry into the floor below.

Therefore, by appropriately setting the distance between the inner and outer drainers 21 and 31 and the opening area of the ventilation hole 35, a sufficient ventilation can be obtained and the influence of wind and rain can be avoided. The height can be set to a height according to the required strength. As a result, the cloth foundation 11 can be made lower than before, and it is easy to deal with restrictions on the height of the building, restrictions on oblique lines, etc., and it is also possible to increase the height of the indoor ceiling.

Further, since an insect repelling wire net 41 is provided,
In addition to preventing insects and other small animals from entering and leaving under the floor, the strength of the external drainer 21 can be improved by engaging its tip with the folded side 24 of the external drainer 21.

By appropriately setting the shape and installation interval of the base piece 13, it is possible to provide the drainage provided substantially over the entire circumference of the building with a function of underfloor ventilation, thereby providing sufficient and uniform underfloor ventilation. It can be performed. Furthermore, the design of the building can be improved as compared with the case where the ventilation holes are provided in the cloth foundation 11.

Moreover, by forming the drainers 21 and 31 from steel plates, they can be used sufficiently within a range where there is a risk of fire spread and can be applied to fire-resistant buildings. Further, the hanging side 34 of the inner drainer 31 can be used as a ruler when applying mortar to the outer surface of the foundation.

[0016]

As described above, according to the underfloor ventilation structure of the present invention, a sufficient underfloor ventilation capacity can be obtained, and intrusion of rainwater and entry and exit of insects can be prevented. Furthermore, since the foundation height can be reduced, the degree of freedom in building design can be improved, and the invention can be applied to fire-resistant buildings.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of an underfloor ventilation structure of the present invention.

FIG. 2 is a perspective view of the same.

[Explanation of symbols]

11 ... cloth foundation, 12 ... outer wall, 13 ... base piece, 14 ...
Joist, 21: external draining material, 22: fixed side, 23a: covering side horizontal plate portion, 23b: covering side vertical plate portion, 23c: covering side oblique side portion, 24 ... folded side, 31 ... internal draining material, 32 ... length Plate part, 33 ... hypotenuse part, 33a ... lower side hypotenuse part, 33b ...
Water return side, 33c: Upper oblique side, 34: Hanging side, 35
... vents, 41 ... insect-proof wire mesh

Claims (3)

[Claims] 1. A base drainer provided on an outer side of a base at a lower end portion of an outer wall is formed by an external drainer on an outer side and an internal drainer on an inner side, and the internal drainer is fixed to a vertical plate fixed to an outer surface of the base. Portion, a hypotenuse extending from the lower end of the vertical plate portion along the upper surface of the foundation, and a drooping side hanging downward from the outer end of the hypotenuse along the outer surface of the foundation, The draining material is fixed to the upper edge of the vertical plate portion of the internal draining material, and extends outward and downward from the lower end of the fixed side, between the inner surface thereof and the outer surface of the internal draining material and at the lower end thereof. A cover side for forming a predetermined ventilation passage between the edge and the outer surface of the foundation; and forming a ventilation opening for communicating the ventilation passage with the underfloor in a vertical plate portion of the internal drainage material; An underfloor ventilation structure characterized by an insect-proof wire mesh in the passage. At the lower end of the covering side of the external draining material, a folded side bent upward toward the inner side is provided, and the base side of the insect repellent wire mesh is fixed to the oblique side of the internal draining material. The underfloor ventilation structure according to claim 1, wherein a front end portion is engaged with the folded side. 3. The hypotenuse portion of the internal drainage material includes a lower hypotenuse portion along the upper surface of the foundation, a water return side obliquely rising outward from an inner end of the lower hypotenuse portion, and The underfloor ventilation structure according to claim 1, further comprising an upper oblique side portion connected from an upper end of the reverse side to a lower end of the vertical plate portion.