JPS6134455Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a spacing holder for concrete formwork, and aims to provide a lightweight and strong holder that can be manufactured efficiently by progressive press processing and does not require cutting or sagging. It was developed for this purpose.

Conventionally, the most widely used concrete formwork spacing holder is as shown in FIG. It has a simple structure in which an inner regulating piece 12 made of a cut-and-raised piece is provided inward by a thickness of . This shape is, for example, in the 50s.
This was disclosed in No. 28025 or Japanese Utility Model Publication No. 54-10735, and has now become the mainstream of spacing devices. However, although at first glance the manufacturing process is simple and it can be supplied at a relatively low cost, it still has various drawbacks. That is, the inner regulating piece 12
A cut-and-raised hole 13 is made in the metal fitting body in order to cut and raise the
The bending strength of this part decreases, and the outer regulating piece 1
1 is also simply bent at right angles, so it has the disadvantage that it opens left and right due to lateral pressure. Width for general cloth foundations
120mm x height 450mm or more, as an example 120mm
In the case of x700mm concrete pouring, temporarily 1m
If one spacing holder is used for each spacing, the side pressure applied to one outer regulating piece is about 100 kg.
However, this is also a case where the bottom of the formwork is in complete contact with the spacer and the spacer is stably installed on the foundation surface, and a small amount of tension or shear force is applied. However, in normal construction, complete adhesion and stable placement are extremely rare, and a bending moment is applied to the spacer in some way, requiring great strength. Therefore, the spacer having the above shape must have a large thickness or width, and usually a steel plate with a thickness of 3 mm or more and a width of 30 mm or more is used. When the plate thickness becomes large in this way, in addition to high material costs, the workability of cutting and bending with a press decreases, and wear and tear of the mold and occurrence of burrs on the cut and bending pieces become noticeable. Another disadvantageous structure is that the fitting body is flat over its entire length, resulting in a lack of stability during installation.

The concrete form spacing holder (hereinafter simply referred to as holder) of the present invention solves the above-mentioned drawbacks, and has the advantage of being lightweight and having great strength.
Its structural feature is that it consists of a single continuous strip-shaped thin metal plate, which is bent at both ends to form an outer regulating part while forming a bead along its entire length.
The inner regulating part forms a continuous rising wall from the bead, and the center bottom is higher than the bottom of the formwork fitting part.

1 to 3 are views showing a specific embodiment of the present invention, with FIG. 1 being a side view and FIG. 2 being a plan view. Moreover, FIG. 3 is a sectional view showing the state of use.

The holder 1 of the present invention is formed by pressing a single strip-shaped metal plate, which is the same as the conventional product shown in Fig. 4, but the plate thickness can be reduced to about 1/2. , characterized by the absence of cut and raised edges. Therefore, its shape is such that beading is performed over the entire length of the strip-shaped metal plate to form continuous irregularities. The overall shape is formed by bending the outer regulating parts 2, 2, which are necessary as formwork holders, at both ends, and then cutting the inner regulating parts with the width of the formwork as the formwork fitting parts 3, 3. Instead of raised pieces, simple standing walls 4, 4 are formed by constricting or protruding almost at right angles, step parts 5, 5 are provided toward the center, and the central bottom part and central convex part 7 are beaded out. Another feature of the present invention is that the center bottom side 6 is slightly higher than the bottom side 8 of the formwork fitting part.

These outer regulating portions 2 and formwork fitting portions 3 are provided with two bead protrusions, and from the inner regulating rising wall 4 to the stepped portion 5 and the central bottom portion 6 are provided with one bead extending from the central convex portion 7. , and both side edges are provided in a flange shape continuously up to the outer regulating portions 2, 2 at both ends. Of course, the outer regulating part 2 and the formwork fitting part 3 may also be made of one bead,
There is no problem even if the bead is not continuous even to the leading edge of the outer regulating part, and the bead extension is reinforced halfway.

The usage mode of the holder of the present invention is shown in Fig. 3, and it can be used in exactly the same way as the conventional one.
By placing the outer regulating part 2 on top of 5 with the end thereof facing upward, the interval between the lower ends of the formwork 16 is regulated, and by placing the outer regulating part 2 in the opposite direction, the interval between the upper ends of the formwork 16 is regulated.
In the case of regulating the lower end of the formwork, the center bottom part 6 is higher than the formwork fitting part bottom part 8 and there is a gap P, so the foundation 1
It can be stably installed even if the five sides are somewhat uneven. Moreover, the bottom side 8 of the formwork fitting part also has a bead, which makes it sit better than a flat plate. Furthermore, when used to regulate the upper end of the formwork, the central protrusion 7 is located above the upper surface of the concrete 17 by the gap Q, making it easier to trowel the upper end of the concrete, and in addition, the bottom of the formwork fitting part 8 and the center base part 6, that is, the gap P is set to a small amount (minimum as long as it does not impair stability during installation), so there is less risk that the center of the holder will be buried in concrete during concrete pouring. . This is because when the interval P becomes large, when used to regulate the top surface of a concrete formwork, the central recess 7 and the central base 6 are buried in the poured concrete and harden, making it difficult to remove. is too small and the center bottom part 6 is on the same plane as the formwork fitting part bottom part 8 (distance P = 0))
This is because if it approaches , the problem arises that it will not sit well when used as a lower surface regulating piece of a formwork. Furthermore, the holder 1 used to regulate the bottom edge of the formwork remains buried after the concrete 17 is poured, so it is a kind of disposable method, and the lighter the weight of the metal fitting, the more resources are saved. The weight of the product of the present invention is approximately 1/2 that of conventional products, and it is also lightweight and convenient to transport and handle.

Since the holder of the present invention is formed by overhanging or drawing from the rising wall to the stepped portion, the cross-sectional strength is increased, and the strength is significantly increased even if it is a thin plate compared to the conventional notch type. Making the sheet thinner is also superior in terms of manufacturing, as the sheet thickness can be halved with the same strength, raw material costs are low, the shape is simple, productivity is good, and progressive press processing is possible. In addition, since there are no notches, there are no sharp burrs, it is safe to handle, and the formwork will not be damaged.The structure of the present invention has many advantages.

[Brief explanation of the drawing]

Figure 1 is a side view of the present invention, Figure 2 is a plan view of the same,
FIG. 3 is a sectional view showing an embodiment of the present invention, and FIG. 4 is a perspective view of a conventional product. DESCRIPTION OF SYMBOLS 1... Concrete form holder, 2... Outer regulation part, 3... Formwork fitting part, 4... Inner regulation rising wall, 5... Step part, 6... Center bottom part, 7... Center Convex portion, 8...Bottom side of formwork fitting part, 9...Protrusion part, 16...Formwork.

Claims (1)

[Scope of utility model registration request] In a holder made of a strip-shaped metal plate used when pouring concrete between two formworks while maintaining the distance between them, a bead is formed on both ends of the metal plate over almost the entire length. An outer regulating part 2 bent at right angles, a formwork fitting part 3 corresponding to the width of the formwork, an inner regulating rising wall 4 formed by overhanging, a stepped part 5 diagonally descending with an appropriate dimension, and a central convex part 7 and are sequentially provided toward the center of the metal strip-shaped plate material, and the center base part 6 is formed slightly higher than the position of the formwork fitting part bases 8 at both ends. Retainer.