JPH0352915Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a synthetic resin formwork spacing holder used when placing mortar or concrete, and is particularly suitable for use in slope protection methods. This invention relates to a formwork spacing holder made of synthetic resin.

[Prior art] When creating sites for roads or buildings by cutting through mountains, hills, etc., a slope mortar spraying method is used, which involves pouring mortar, concrete, etc. onto the slope to reinforce weak points. However, from the perspective of greening, mortar is sprayed on parts of the slope rather than on the entire slope, and plants are grown in the areas where mortar is not sprayed. In order to spray mortar, a formwork is naturally required to prevent the mortar from flowing out.

By the way, since the locations where mortar needs to be sprayed are generally steep slopes, setting the formwork into a predetermined shape is a heavy labor, and some kind of countermeasure has been desired. Therefore, the applicant
We also proposed a cardboard formwork that was lightweight and easy to set up (Japanese Patent Publication No. 18775/1983). Furthermore, although paper formwork is lightweight and easy to handle, it is somewhat weak, so the applicant also proposed a formwork unit that solved the problem of rust by applying synthetic resin connectors to the reinforcing bars (Jitsukaisho). 61-35949).

With the progress of technological development as described above, the problem of formwork in slope protection works seemed to have been resolved, but
As a result of subsequent research, it was discovered that if a formwork spacing holder that satisfies the following conditions was developed, a more ideal one could be obtained. In other words, considering that it has the tensile strength to withstand the lateral pressure of fresh concrete or mortar, the purpose of rust prevention, and that metal must not be present within 25 mm from the concrete surface, metal should not be used, and formwork should not be used. Since the site where the formwork is to be set has a steep slope, we have found that a formwork holder that satisfies the following requirements is ideal: it is lightweight and easy to set up, it is convenient to transport, and it can be carried in large numbers at once. .

[Object of the invention] Therefore, an object of the present invention is to provide a formwork spacing holder that completely satisfies the above conditions.

[Structure of the invention] According to the invention, there is provided a spacing holding part that holds the formwork so that its surfaces face each other at a predetermined interval, and a formwork that is formed at both ends of the spacing holding part to lock the formwork. In the formwork spacing holder made of synthetic resin, the spacing holding part has a reinforcing bar locking part that positions the main reinforcing bars, and the formwork engaging part has a through hole in the formwork. a first enlarged part that passes under force, and a second part with a relatively large diameter that prevents the formwork from collapsing inward.
and a small shaft portion having a smaller diameter than the through hole of the formwork and connecting both of the enlarged portions at an interval approximately equal to the thickness of the formwork, the spacing holding portion and the formwork engaging portion. are made of synthetic resin and are integrally connected by a thin hinge section.

[Operations and effects of the invention] Since the present invention is configured as described above,
In use, the first enlarged portion is pushed into a through hole in the formwork. Then, the formwork is held between the first and second enlarged portions, and is held at a predetermined interval by the spacing holding portion. When such formwork is assembled on site, it is set directly on the construction slope. When assembled in a factory or the like, the formwork is relatively moved in parallel in the longitudinal direction in order to reduce the volume. Then, since the spacing retaining part and the formwork engaging part are coupled at the hinge part, this hinge part is bent, and the gap between the formworks becomes smaller. In other words, when folded, the apparent volume becomes smaller. It can be stored in this state and transported to the site.

After the mortar spraying or concrete casting is completed and a curing period has elapsed, the first enlarged portion is struck with a hammer or the like to cut off, for example, a small shaft portion, and the first enlarged portion is separated and the formwork is removed.

According to the present invention, since the formwork spacing holder is entirely made of synthetic resin as described above, it is lightweight and can be easily transported and constructed on slopes. Moreover, since it is made of synthetic resin, there is no problem of rust, and therefore there is no risk of problems such as cracking and destruction of the concrete. Further, according to the present invention, since the formwork engaging part and the spacing holding part of the spacing holder are connected by a thinned hinge part, the spacing between the formworks can be narrowed when necessary. Therefore, it is easy to transport to the construction site. Further, during the work of setting the formwork, the reinforcing bars are positioned using the reinforcing bar locking portions of the spacer. Therefore, there is no particular need for a positioning member, which is advantageous in terms of cost.

[Preferred Embodiment] When implementing the present invention, as the synthetic resin,
It is preferable to apply polypropylene. Polypropylene is strong against bending and is convenient for forming the hinge portion. For thinning, it is desirable to form it into a plate shape, taking into account the direction of bending. This is because when formed into a plate shape, it is easy to bend considering its cross-sectional area and has high tensile strength.

In addition, there are cuts and scratches on the small shaft,
It can also be made easier to break when dismantling the formwork.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings. Now, referring to FIG. 1 and FIG. 2, this embodiment has a spacing holding part 1, four formwork engaging parts 10,
It consists of...

The spacing holding part 1 is made of synthetic resin together with the formwork engaging part, and is formed into a substantially X-shape in the first embodiment. The cross portion serves as a locking portion 2 for the reinforcing bar 3. Therefore, when formed into an X-shape like this, there is no need to separately provide the reinforcing bar locking portion 2.

The formwork engaging part 10 has a first enlarged part 11 and a second enlarged part 11.
It is formed from an enlarged part 12 and a small shaft part 13 that connects these two enlarged parts. As clearly shown in FIG. 1, these engaging portions 10, 10, . The first enlarged portion 11 is a portion that is inserted by force into a through hole formed in the formwork. For this purpose, the tip is formed into a tapered shape. Both enlarged parts function to hold the formwork, and the small shaft part 13 side of the second enlarged part 12 constitutes a large diameter flange surface 14 to prevent the formwork from falling inward. It's becoming like that. Surface 15 of the first enlarged portion 11 on the small shaft portion side
Although it has a small diameter, it works to prevent the formwork from falling out and from falling outward. The axial length of the small shaft portion 13 is greater than the thickness of the formwork, and its diameter is smaller than the diameter of the through hole in the formwork. These enlarged portions 11, 12 and small shaft portion 13 are integrally molded from synthetic resin.

The formwork engaging part 10 and the spacing holding part 1 are integrated by a hinge part 20 near the formwork engaging part.
As shown in FIG. 1, the hinge portion is thinned into a plate shape, and its surface is parallel to the plane of the paper. Therefore, referring to FIG. 2, the formwork engaging portion is easy to bend in the vertical direction indicated by arrow A.

To describe the operation of the above embodiment, the first enlarged portion 11 is inserted into the through holes of the formworks 30, 30 using a plurality of spacer retainers. Then, as shown in FIG. 3, the pair of formworks are held so that their surfaces face each other at a predetermined distance. Therefore, it can be set on the construction surface in this state. When it is necessary to fold for transportation, storage, etc., the formworks 30, 30 are relatively moved in the direction of arrow B, as shown in FIG. Then, the hinge parts 20, 20 are bent, the space between the forms 30, 30 becomes narrower, the apparent volume becomes smaller, and the product is folded. Obviously, it can be moved in the opposite direction and kept at a predetermined distance.

It is desirable to change the shape of the spacing section 1 depending on the number of reinforcing bars used or the location where they are installed. This is because by changing the shape, there is no need to separately provide a reinforcing bar locking portion. and,
Examples are shown in FIGS. 5-8. In other words, when two reinforcing bars 3, 3 are used between the formwork, as shown in FIG.
It is composed of parallel members 4, 4 and a single member 5 that connects them, and the cross portion of the members 4, 4 and 5 can be used as the reinforcing bar locking portion 2. In addition, when using four reinforcing bars 3, 3..., as shown in Figs. 7 and 8, two parallel members 4, 4 and two connecting members 5, 5 are used. It is constructed in the shape of a parallel cross, and the cross portions are used as reinforcing bar locking portions 2, 2, . . . . Of course, various modifications can be made depending on the number of reinforcing bars and the installation positions. Furthermore, the fifth
The structure of the formwork engaging portion 10 of the embodiment shown in FIGS. 1-8 is similar to that described with respect to FIGS. 1 and 2.

[Summary] As detailed above, according to the present invention, since the formwork spacing holder is made of synthetic resin, it is lightweight and inexpensive, and does not rust. Therefore, when applied to slope protection works, it is easy to transport and set the formwork, and there is no problem of cracking due to volumetric expansion of concrete, resulting in the formation of high-quality protective walls. Furthermore, since the hinge portion allows bending, the formwork can also be folded. Furthermore, since it is integrally molded from synthetic resin, it has the advantage of being able to be provided at low cost.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention, Figure 2 is a plan view showing one embodiment of the present invention;
The figure is a side view, FIG.
The figure is also a perspective view showing the folded state.
8 to 8 show other different embodiments of the present invention, FIG. 5 and FIG. 7 are plan views similar to FIG. 1, and FIG. 6 and FIG. 8 is a side view of each of FIG. 7; FIG. 1... Spacing holding part, 2... Reinforcement locking part, 3...
Reinforcement bar, 10...Formwork engaging part, 11...First enlarged part, 12...Second enlarged part, 13...Small shaft part, 2
0...Hinge part, 30...Formwork.

Claims (1)

[Scope of utility model registration request] A mold made of synthetic resin, consisting of a spacer holding part that holds the formwork so that its surfaces face each other at a predetermined distance, and a formwork engaging part that is formed at both ends of the spacer holding part and locks the formwork. In the frame spacing holder, the spacing holding part has a reinforcing bar locking part that positions the main reinforcing bars, and the form engaging part has a first enlarged part that passes through a through hole of the form by force. and a second enlarged portion having a relatively large diameter to prevent the formwork from falling inward; and a second enlarged portion having a diameter smaller than the through hole of the formwork and connecting the two enlarged portions at an interval approximately equal to the thickness of the formwork. a small shaft part, and the spacing holding part and the formwork engaging part are made of synthetic resin and are integrally connected by a thinned hinge part. Resin formwork spacing holder.