JP2000199286A - Work method for underfloor vent hole and structure of formwork - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide work method for underfloor vent holes and formwork construction capable of fully realizing the functions of underfloor vent holes by simplifying screen attaching work permitting air ventilation between inside and outside and making the vent hole installation easier. SOLUTION: In the underfloor vent hole installation method, a screen 4 is clamped to joining surfaces of an underfloor vent hole formwork which can be separated to two pieces, foundation concrete is poured, then the underfoor vent hole formwork is removed, and a screen 4 is embedded in the middle portion having the width equal to that of the concrete footing. Also, according to the construction of this formwork, a fastening member for clamping the screen 4 is provided at the inner side of the underfloor vent hole formwork which can be separable into two pieces. Also, a middle portion of the vent hole formwork separable into two pieces is drawn to form a V-shaped cross section in the length direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor ventilation port for forming a ventilation port on a foundation of a building and a structure of a formwork used for the construction.

[0002]

2. Description of the Related Art A conventional underfloor ventilation opening forms a predetermined large space for fitting a screen when forming a fabric foundation (foundation concrete), and a suitably shaped screw such as a fence is formed in this space. -Is attached. As a conventional general construction method, first, a reinforcing bar is inserted into a predetermined portion forming a cloth foundation, and an underfloor ventilation opening formwork made in accordance with the dimensions of the screen is attached to the formwork panels on both sides. After the casting, the underfloor ventilation opening formwork was removed, a screen was attached to the space, and mortar was applied to the outer rim to finish.

[0003]

Generally, a screen is attached to a widthwise middle portion of a space formed in a base concrete. That is, since both sides of the screen are in a shelf shape, dust and the like are easily tolerated, and not only the appearance is bad but also the ventilation action is hindered. Further, since the outer peripheral structure of the underfloor ventilation opening form has a structure in which draft is provided on the same or a part of the inner and outer surfaces, when removing the underfloor ventilation opening form, the base concrete and the base concrete are removed. The outer edge of the underfloor vent form was difficult to separate and was very difficult to remove.

Therefore, the present invention simplifies the work of attaching a screen which allows ventilation between inside and outside, and simplifies the work of installing an underfloor ventilation port, thereby sufficiently fulfilling the function as an underfloor ventilation port. An object of the present invention is to provide an underfloor ventilation port construction method and a formwork structure that can be used.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a screen for allowing ventilation between inside and outside is fastened to a mating surface of an underfloor ventilation opening formwork which can be divided into two pieces. After the base concrete is cast and sandwiched by the above, the two under-floor ventilation opening forms are removed to bury the screen in the middle of the width of the base concrete.

In addition, a fastening member is provided as a means for holding a screen which allows ventilation between the inside and outside, inside the underfloor ventilation opening formwork which can be divided into two pieces.

In addition, the underfloor ventilation opening formwork, which can be divided into two pieces, is formed into a V-shaped cross section by squeezing an intermediate portion in the longitudinal direction of the formwork. By facilitating the separation of the outer edge of the underfloor ventilation opening form contacting with the underfloor ventilation opening form, it is easy to remove the underfloor ventilation opening formwork. Good to be with.

[0008]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of an underfloor ventilation opening form 1 used to form an underfloor ventilation opening and a screen 4 sandwiched between the forms 1, FIG. 2 is a sectional view showing a construction state,
FIG. 3 is a front view of the underfloor ventilation port after construction.

In the figure, an outer mold 2 and an inner mold 3 are made of wood, and have a rectangular shape when viewed from the front, and have a thickness substantially corresponding to the width of the base concrete 7. Then, the entire diameter of the joint of the outer mold 2 and the inner mold 3 is narrowed so as to be smaller than the diameter of the joint opposite to the joint, so that each surface at the time of joining has a V-shaped section 6. . In addition, the amount of narrowing down, up, down, left, and right is formed in an optimal shape according to the installation environment and location.

As shown in FIG. 4, the outer formwork 2 is formed in a rectangular shape as viewed from the front with two open sides. The diameter of the joint is narrowed down so that each side is smaller than the diameter of the side opposite to the joint, so that each surface when joined to the inner mold has a V-shaped cross section.

This not only facilitates the separation of the outer formwork 2 from the foundation concrete 7 when the outer formwork 2 is removed, but also enhances the ventilation effect by promoting the passage of the wind blown into the screen 4 and also provides the underfloor ventilation. It is possible to obtain an effect that garbage and the like are difficult to bear on the rim.

A screen holding plate 22 as a holding member for the screen 4 is provided at two places on a joint surface 21 of the outer mold frame 2. A screw hole 23 is provided at the center of the screen holding plate 22.
The screw hole 23 is provided with a thumbscrew 24 for holding the screen 4. In order to cope with the structure of the screen 4, a bolt and nut, a wood screw, a screw, a wire, or the like can be appropriately used instead of the thumb screw 24. Form reinforcement ribs 25 are provided at the center and both corners on the opposite side of the joining surface 21.
Is provided.

In this embodiment, the form reinforcing ribs 25 are attached in parallel with the joining surface 21.
5 can be provided at a predetermined position over the entire inner surface, or can be provided upright (not shown) in a direction perpendicular to the joint surface 21.

As shown in FIG. 5, the inner mold 3 is formed in a rectangular shape as viewed from the front with two open sides. The diameter of the joint is narrowed down so that the diameter of each side is smaller than the diameter of the side opposite to the joint, so that each surface when joined to the outer mold 2 has a V-shaped cross section 6.

This not only facilitates the separation of the inner form 3 from the foundation concrete 7 when removing the inner form 3 but also enhances the ventilation effect by promoting the passage of the wind blown into the screen 4 and also provides the underfloor ventilation. It is possible to obtain an effect that garbage and the like are difficult to bear on the rim.

The joining surface 31 of the inner mold 3 is attached to the outer mold 2
The screen holding plate 32 is provided at a position corresponding to the screen holding plate 22 provided in the above. A screw hole 33 is provided in a central portion of the screen holding plate 32, and a thumb screw 24 or the like is inserted into the screw hole 33 to hold the screen 4. Form reinforcement ribs 35 are provided at the center and both corners on the opposite side of the joining surface 31.
Is provided. In this embodiment, the form reinforcement rib 35 is attached in parallel with the joining surface 31.
May be provided at a predetermined position over the entire inner surface or may be provided upright (not shown) at right angles to the joining surface 31.

Form fixing pieces 36 for attaching the inner form 3 to the form panel 9 are provided at a plurality of positions, at three positions in the present embodiment, on the upper edge on the side opposite to the joint surface 31 of the inner form 3. ing. A hole 37 is formed in the center of the mold fixing piece 36, and is attached to a predetermined position of the mold panel 9 with a nail or a screw.

In another embodiment, as shown in FIG. 6, an L-shaped form fixing piece 5 is attached to one or more places instead of the form fixing piece 36. The L-shaped formwork fixing piece 5 is used by being locked to the upper edge of the formwork panel 9, and can easily position the underfloor ventilation opening formwork 1 in the longitudinal direction. This is used when nails or the like cannot be used with a metal formwork panel.

A combination of these materials, such as synthetic resin, metal, or an inner mold made of metal and an outer mold made of synthetic resin, instead of a wooden underfloor vent form. It is possible as well. Synthetic resin is suitable for mass production,
Metal is excellent in rigidity and durability.

The screen 4 which allows ventilation inside and outside is
Although a commercially available product such as a shelf or with an insect-proof wire mesh is used, a foundation concrete 7 is placed between the outer mold 2 and the inner mold 3 during construction.

Using the underfloor ventilation opening formwork 1 and the screen 4 configured as described above, construction is performed as follows. A reinforcing bar 8 is provided at a predetermined position in a portion where the cloth foundation (base concrete) 7 is formed. The screen 4 is placed on the joint surface 21 of the inner mold 2, and the outer mold 3 is placed on the screen 4 so that the joint surface 31 contacts the screen 4.
The screen 4 is sandwiched between the outer form 3 and the inner form 2 and screwed into the screw holes 23 and 33 using the thumb screws 24 or the like to form the outer form 3, the screen 4 and the inner form. 2 are integrated.

After positioning the formwork 1 using a level or the like with the integrated underfloor vent form 1 attached to a predetermined position on the side surface of the inner formwork panel 9, The form fixing piece 36 provided on the upper edge of the form 3 is fixed to the inner form panel 9 with nails or screws, and the outer form panel 9 presses the outer surface of the form 2. Then, the form panel 9 and the form 1 are incorporated into the cloth base 7.

After the base concrete 7 is cast into the formwork panel 9, the outer and inner formwork panels 9 are removed, and then the outer formwork 2 and the inner formwork 3 are removed. The outer edge of the screen 4 is finished with mortar. In addition, mortar is applied to the outer surface of the cloth base 7 as necessary.

[0024]

According to the construction method of the present invention, the screen is sandwiched between the underfloor ventilation opening formwork used when placing the concrete. It can be installed reliably and beautifully. Therefore, the work of inserting the screen into the space provided as the underfloor ventilation port becomes unnecessary, and the work can be simplified.

Further, since the outer peripheral portion of the underfloor ventilation opening form, that is, the joint surface between the outer formwork and the inner formwork is formed in a V-shaped cross section, after the concrete is cast, the outer formwork and the inner formwork are formed. Can be easily removed and the construction work can be facilitated.

In addition, it is possible to eliminate the conventional shelf-like portion such as a ventilated vent below the floor, which is resistant to dust and the like, and that both the outer and inner portions of the screen are inclined so that the diameter becomes larger toward the outside. The drainage is good, and the above effects can be further enhanced. In addition, since the wind blowing from the outside to the inside is given power, the ventilation function is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an underfloor ventilation opening frame and a screen according to a first embodiment.

FIG. 2 is a cross-sectional view showing a part of a process of constructing an underfloor ventilation opening.

FIG. 3 is a perspective view showing a completed state of an underfloor ventilation opening.

4 (a) is a front view, and FIG. 4 (b) is an A-
It is A sectional drawing.

5 (a) is a front view, and FIG. 5 (b) is a B-
It is B sectional drawing.

6A and 6B are inner molds showing another embodiment, where FIG. 6A is a front view and FIG. 6B is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underfloor ventilation form 2 Outer form 3 Inner form 4 Screen 5 L-form form fixing piece 6 V-shaped cross section 7 Cloth foundation (foundation concrete) 8 Reinforcing steel 9 Form panel 22 Screen holding plate 24 Thumb screw 25 Formwork reinforcing rib 32 Screen holding plate 35 Formwork reinforcing rib 36 Formwork fixing piece

Claims (3)

[Claims] An under-floor vent formwork (1) that can be divided into two pieces.
After a screen (4) that allows ventilation inside and outside is clamped by a fastening member on the mating surface and a base concrete is cast, the two underfloor vent opening formwork (1) is removed. As a result, the above-mentioned screen is placed in the middle of the width of the base concrete.
(4) A method for constructing an underfloor ventilation opening, characterized by burying a floor (4). 2. An underfloor ventilation form (1) that can be divided into two pieces.
A structure for a formwork of an underfloor ventilation opening, characterized in that a fastening member for sandwiching a screen (4) for allowing ventilation between the inside and outside is provided inside the inside. 3. An underfloor vent formwork that can be divided into two pieces.
3. The structure of the underfloor ventilation opening formwork according to claim 2, wherein the intermediate portion in the length direction is narrowed to form a V-shaped cross section.