JPH0538196Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (industrial application field) This invention relates to a concrete formwork for forming through holes such as ventilation holes in concrete.

(Prior art) Conventionally, as shown in Fig. 4, when forming ventilation holes 2, ceiling ventilation holes 3, small window-like through holes 4, etc. in the foundation concrete 1, the formwork body was made of synthetic resin. Concrete formwork 5, 6, 7 integrally formed in
were used to improve the peelability of the formworks 5, 6, and 7 from the foundation concrete 1, thereby increasing work efficiency.

(Problem that the invention aims to solve) However, when these conventional formworks 5, 6, and 7 are used, the formwork body is made of synthetic resin, so it is difficult to absorb the impact during concrete pouring. Pressure was applied to the outer frame of the formwork body due to the weight of the mortar, the weight of the mortar, and the shrinkage of the concrete during curing, causing the frame to curve inward and cause formworks 5, 6, and 7 to separate from the foundation concrete 1. At that time, there was a problem in that the ventilation holes 2, ceiling ventilation holes 3, and through holes 4 were formed in which the inner peripheral edges of the openings bulged inward in an arc shape, as shown by the two-dot chain line in FIG.

However, although attempts have been made in the past to prevent deformation by increasing the wall thickness of the form body, no measures have been taken to fundamentally solve this problem.

Structure of the device (Means for solving the problem) This device was created with a focus on the problems mentioned above. A one-to-one pair of formwork bodies integrally formed of synthetic resin into substantially the same shape and fixed by screws, and inner surfaces of the long side frame part and the short side frame part of the formwork body, A plurality of frame reinforcing ribs formed to extend in the width direction of the formwork, and a reinforcing plate made of a steel material and fixed to the reinforcing ribs of at least the long side frame of the formwork body are provided. .

(Function) Therefore, the concrete formwork for forming perforations of this invention has a simple structure and can be manufactured at low cost, and also ensures that the outer peripheral frame part of the formwork body is not bent or deformed during concrete pouring or curing. It is possible to form a through hole of a predetermined shape without any bulging distortion or the like.

(Example) Hereinafter, this invention will be described in detail based on an example in which this invention is embodied in a mold for forming ventilation holes.

Now, as shown in FIGS. 1 and 2, the formwork of this embodiment includes a pair of formwork bodies 11 of the same shape, a mesh plate 12 interposed and held between both formwork bodies 11, and one of the formwork bodies 11. A hanging plate 13 extending upward from within the form body 11 of
It is composed of. Then, by screwing thumbscrews 14 from the other form body 11 to the hooking plate 13 through the mesh plate 12 and one form body 11, the respective members 11, 12, 13 are assembled integrally. Fixed.

Both formwork bodies 11 are integrally formed of synthetic resin as a common component, and a pair of upper and lower long side frames 15 extending in the left-right direction and a pair of left and right short side frame portions 16 extending in the vertical direction are provided on the outer periphery thereof. At the same time, a side plate portion 17 is provided at one end. A plurality of frame reinforcing ribs 18 extending in the width direction are formed on the inner surfaces of the long side frame portions 15 and the short frame portions 16 of the form body 11, and the inner surfaces of the side plate portions 17 are also formed in the vertical and horizontal directions. Rib 1 for reinforcing the side plate that extends
9 is formed. Further, a plurality of positioning protrusions 20 and the thumbscrews 14 are provided on the outer surface of the side plate portion 17.
A pair of insertion holes 21 are formed for the purpose.

A locking groove 22 is formed inwardly at the outer end of each frame reinforcing rib 18 located within the long side frame portion 15 of the form body 11 . A reinforcing plate 23 made of steel and having a substantially L-shaped cross section is provided at the outer end of the frame reinforcing rib 18 so as to extend along the edge of the long side frame part 15 of the form body 11. It is mounted and fixed by engaging the engagement groove 24 with the locking groove 22. Therefore, this reinforcing plate 23
Both long side frames 1 of the formwork main body 11 made of synthetic resin are
5 is reinforced, and it is possible to reliably prevent the long side frame portions 15 from being bent inward during concrete pouring associated with the use of formwork.
Furthermore, if the reinforcing plate 23 is attached to the form body 11 immediately after the form body 11 is released from the molding machine, the work of attaching the reinforcing plate 23 can be easily carried out, and the form body The reinforcing plate 23 can be firmly fixed to the mold body 11, and it is also possible to prevent the long side frame portions 15 from being deformed when the form body 11 is cooled and hardened.

On the other hand, the mesh plate 12 is formed of a steel plate, and has a plurality of ventilation holes 25 formed therein extending in the vertical direction over the entire left and right length thereof. As shown in FIG. 1, when the mesh plate 12 is sandwiched between both formwork bodies 11, the positioning protrusions 20 on both formwork bodies 11 are connected to each other through arbitrary ventilation holes 25. It's getting old. The retaining plate 13 is bent at a predetermined slope, and a screw hole 26 into which the wing screw 14 is screwed is formed at its lower end.

Now, when using the formwork for forming ventilation holes configured as described above, as shown in Fig. 1,
A pair of formwork bodies 11, mesh plates 12, and hanging plates 13 are assembled with thumbscrews 14 to form a formwork, and the formwork is inserted between a pair of foundation concrete formwork bodies 27 that are arranged opposite each other. By hooking the hanging plate 13 to the upper edge of one of the formwork bodies 27, the formwork for forming ventilation holes can be positioned at a predetermined position. In this state, concrete is poured between both form bodies 27, and after the concrete hardens, both form bodies 2
7 and loosen the thumbscrews 14 of the formwork for forming ventilation holes and separate and remove each formwork body 11 outward on both sides, thereby forming ventilation holes 2 in the foundation concrete 1 as shown in Fig. 4. can do.

In the formwork for forming ventilation holes of this embodiment, the formwork main body 11 is integrally formed of synthetic resin, and a steel material is formed along the inner surface of the outer edge of the long side frame part 15. Since the reinforcing plate 23 is provided, it is possible to reliably prevent the outer peripheral frame portion of the form body 11 from being bent inward during the concrete pouring, as shown by the two-dot chain line in FIG. Ventilation hole 2 with a predetermined shape without arc-shaped bulging distortion
can be formed. Moreover, since the form body 11 is made of synthetic resin, the form body 11 can be efficiently and easily peeled from the concrete.

Note that this invention is not limited to the configuration of the above-described embodiment; for example, the reinforcing plate may be formed into a rectangular frame shape and attached to the entire circumference of the edge of the outer peripheral frame portion of the form body. Or, add the reinforcement plate to the front shape of approximately L.
It is possible to form a shape in a shape and attach it from the long side frame to the short side frame of the formwork body, or to form a ceiling ventilation hole 3 as shown in Fig. 4 using this invention. The present invention may be embodied with arbitrary changes within the scope of the spirit of this invention, such as embodying it in various forms for forming through-holes, such as the formwork 6 and the formwork 7 for forming the through-holes 4. is also possible.

Effects of the invention As detailed above, this invention has a simple structure and can be manufactured at low cost, and also prevents bulging distortion by reliably preventing bending deformation of the outer peripheral frame of the formwork body during concrete pouring. This provides an excellent effect in that a through hole of a predetermined shape can be formed.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view showing an example of a concrete formwork embodying this idea, Figure 2 is an exploded perspective view of the main components of the formwork, and Figure 3 is reinforcement for the formwork body. FIG. 4 is a partially exploded perspective view showing an enlarged view of the plate mounting structure, and FIG. 4 is a perspective view illustrating formwork for forming various through holes in the foundation concrete. 11... Form body, 15... Long side frame portion, 23...
...Reinforcement plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A one-to-one set of formwork for forming through-holes such as ventilation holes in concrete, which are integrally formed in substantially the same shape from synthetic resin and fixed by tightening with screws 14. formwork body 11
and the long side frame portion 15 and the short side frame portion 1 of the form body 11.
a plurality of frame reinforcing ribs 18 formed on the inner surface of the mold body 6 to extend in the width direction; and at least the long side frame portions 15 of the mold body 11.
A reinforcing plate 23 made of a steel material and fixed to the reinforcing rib 18 of the concrete formwork for forming a through hole.