JPH0341557Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention relates to a formwork for forming an underfloor ventilation hole for forming a perforated ventilation hole through a concrete foundation.

(Problem to be solved by the invention) This invention is to create a formwork body for forming an underfloor ventilation hole to provide a tapered cylindrical ventilation hole that narrows from the outdoor opening to the indoor opening. It can be easily and reliably positioned in a predetermined position between the inner fabric foundation concrete molding forms, and marks from hanging members remain as scratches above the ventilation holes on the outdoor side of the fabric foundation concrete being formed. To provide a formwork for forming an underfloor ventilation hole, which can form cloth foundation concrete without fear and whose main body can be pulled out to the outdoor opening side.

Structure of the invention (Means for solving the problem) This invention was made by focusing on the above-mentioned problem, and it is a mold for forming an underfloor ventilation hole which is open at both ends and has a substantially cylindrical shape. Open the frame body 1 to the outdoor side 2
It is formed into a tapered shape that becomes narrower toward the indoor opening 3, and support members 5, 13 are installed inside the form body 1, and a hanging member 6 is rotatable at one end of the support members 5, 13. The other end of the hanging member 6 extends outward from the indoor opening 3 of the formwork body 1 and is latched to the upper end of the formwork 10 for fabric foundation concrete molding on the indoor side. A locking portion 8 is provided.

(Function) Therefore, in this invention, the formwork main body 1 for forming underfloor ventilation holes is inserted between the outdoor and indoor side fabric foundation concrete forming forms 9 and 10 to lock the hanging member 6. The form body 1 can be easily and reliably positioned at a predetermined position by simply locking the part 8 to the upper end of the form 10 for molding cloth foundation concrete on the indoor side. In this state, if concrete is poured between the formworks 9 and 10 for forming cloth foundation concrete, it is possible to mold cloth foundation concrete that does not leave any scars from the hanging member 6 on the outdoor side surface above the ventilation hole. can. Then, the hanging member 6 is rotated and laid down, and the entire form body 1 is pulled out from the outdoor opening 2.

(First Embodiment) A first embodiment of this invention will be described below with reference to FIGS. 1 to 3.

Now, in this embodiment, a formwork body 1 for forming an underfloor ventilation hole is formed into a substantially rectangular cylindrical shape with both ends open.
is formed in a tapered shape so that the opening area becomes gradually narrower from the outdoor opening 2 to the indoor opening 3, and a notch 4 is provided at the upper edge of the indoor opening 3. The tapered shape is for drainage during rain. The formwork body 1 extends horizontally in the left and right direction within the formwork body 1.
A support plate 5 as a support member is constructed and fixed between both side walls.

A hanging member 6 is rotatably attached to the central part of the support plate 5 by a hinge 7 at a bent portion at one end, and can extend from the indoor opening 3 to the outside and fit into the notch 4. It's becoming like that. A locking part 8 is bent at the other end of the hanging member 6, and as shown in FIG. , 10, this locking portion 7 can be locked to the upper end of the formwork 10 for molding foundation concrete on the indoor side.

Therefore, when molding cloth foundation concrete with ventilation holes using the formwork for forming underfloor ventilation holes of this embodiment, the hanging members 6 are used for forming underfloor ventilation holes as shown in FIG. The form body 1 is inserted between the pair of fabric foundation concrete molding forms 9 and 10 while extending upward from the notch 4 of the form body 1, and the locking part 8 of the hanging member 6 is inserted. When it is locked to the upper end of the fabric-based concrete molding form 10 on the indoor side, the form body 1 is reliably positioned at a predetermined position between both the fabric-based concrete forming forms 9 and 10.

In this state, if concrete is cast between the two fabric foundation concrete molding forms 9 and 10 to form the fabric foundation concrete 11, the formwork body 1
As a result, through-hole ventilation holes 12 are formed at predetermined positions in the cloth foundation concrete 11.

Then, in a state where the cloth foundation concrete 11 is solidified, both cloth foundation concrete forming forms 9,
After removing 10, formwork body 1 for forming underfloor ventilation holes
When the hanging member 6 is released from the mold by hitting it on the outdoor side, the hanging member 6
is rotated clockwise in FIG. 1 on the hinge 7 to lie down as shown by the chain line in the figure, and in this state the hanging member 6 can be easily removed from the ventilation hole 12. Further, in this embodiment, when forming the cloth foundation concrete 11, the hanging member 6 does not extend along the outdoor side cloth foundation concrete molding form 9, so that the molded cloth foundation concrete 11 is not extended outdoors. No scars from the hanging member 6 remain above the ventilation hole 12 on the side surface.

(Second Embodiment) Next, a second embodiment of this invention will be described with reference to FIGS. 4 to 6.

Now, in this embodiment, instead of the support plate 5 of the first embodiment, a support rod 13 as a support member is installed and fixed between both side walls of the form body 1 for forming an underfloor ventilation hole. A pair of regulating pins 14 are arranged and fixed on 13 at a predetermined interval.
The hanging member 6 is rotatably supported on the support rod 13 by a support cylinder 15 between the regulating pins 14 . In addition, in this embodiment, a stepped portion 16 is provided on both the upper and lower walls of the form body 1, and this stepped portion 1
6, steps 18 for supporting the wire mesh 17 are formed on both the upper and lower walls of the ventilation hole 12 after molding. Note that the stepped portions 16 may be formed on both left and right side walls of the form body 1, as shown by chain lines in FIG.

Therefore, even when the formwork for forming underfloor ventilation holes of the second embodiment is used, the formwork main body 1 is connected to the base concrete molding via the hanging member 6, as in the case of the first embodiment. It is possible to easily and reliably position and arrange the concrete at a predetermined position between the formworks 9 and 10, and also to mold the cloth foundation concrete 11 with ventilation holes without any scars on the outdoor side surface.

Note that this invention is not limited to the configuration of each of the embodiments described above, and the configuration of each part may be arbitrarily changed without departing from the spirit of this invention, such as forming the form body 1 into a substantially cylindrical shape. It is also possible to embody it as follows.

Effects of the invention As detailed above, this invention allows the main body of the formwork for forming underfloor ventilation holes to be easily and reliably positioned at a predetermined position between the outdoor and indoor side fabric foundation concrete forming forms. At the same time, there is no risk of marks from the hanging members remaining above the ventilation holes on the outdoor side of the fabric foundation concrete to be formed, and the hanging members can be rotated and laid down, and the whole formwork body can be removed from the outdoor opening. By pulling it out, a tapered cylindrical ventilation hole can be formed without the hanging member locked on the indoor side becoming jammed, which is an excellent effect.

[Brief explanation of the drawing]

Figures 1 to 3 show a first embodiment of a formwork for forming an underfloor ventilation hole embodying this invention.
The figure is a front view, and FIG. 3 is a partially cutaway plan view. Figures 4 to 6 show a second embodiment of this invention, in which Figure 4 is a longitudinal cross-sectional view showing how the formwork is used, Figure 5 is a front view, and Figure 6 is a cross-sectional view. It is. 1... Formwork body for forming underfloor ventilation holes, 3... Indoor side opening, 5... Support plate as a support member, 6...
Suspension member, 8...Locking part, 9, 10... Formwork for forming outdoor and indoor cloth foundation concrete, 13
...A support rod as a support member.

Claims (1)

[Scope of utility model registration request] A form body 1 for forming an underfloor ventilation hole, which is open at both ends and has a substantially cylindrical shape, is formed into a tapered shape that becomes narrower from an outdoor opening 2 to an indoor opening 3, and a supporting member 5 is installed inside the form body 1. , 13, and a hanging member 6 is rotatably attached at one end to the support members 5, 13, and the other end of the hanging member 6 is connected to the opening 3 on the indoor side of the form body 1. A formwork for forming an underfloor ventilation hole, characterized in that a locking part 8 is provided which extends to the outside and can be locked to the upper end of the formwork 10 for forming cloth foundation concrete on the indoor side.