JPH0219475Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention uses concrete formwork spacing interposed between concrete formworks to maintain the spacing between concrete formworks installed facing each other. It's about the ingredients.

[Problems to be solved by conventional techniques and ideas]

Generally, when formwork is stacked in multiple layers,
The joint strength in the vertical direction is insufficient, and the resistance during concrete placement is poor. For this reason, in the past, in order to increase this resistance, special fixing fittings were sometimes used to fix the upper and lower formworks, which caused the problem of an increase in the number of parts.

Furthermore, when a large outward force is applied to the formwork during concrete pouring, the spacer may become unable to support the outward load and may be deformed or destroyed. Therefore, in order to prevent this, conventionally, the thickness of the spacer holder has been increased to increase its strength, or a metal material with high strength has been used. However, increasing the plate thickness or using high-strength metal materials naturally leads to increased costs, and it is difficult to use such materials for spacing retainers buried in concrete. This is extremely inconvenient. In addition, when the metal plate was made thicker, there was a gap between the upper and lower formworks, which caused concrete to leak.

The present invention was developed to solve these drawbacks, and it is possible to increase the resistance without using special fixing metal fittings, and to improve the strength without increasing costs or causing concrete leakage problems. The purpose is to provide a spacer.

[Means to solve the problem]

In order to achieve the above object, in this invention, an inner regulating piece is provided on at least one side edge of the substantially central part of the rectangular spacer body to regulate the distance between the inner surfaces of the opposing concrete forms. The outer regulating piece is bent in substantially the same direction as the inner regulating piece at both ends of the main body, with a form fitting interval corresponding to the thickness of the formwork between the outer regulating piece and the inner regulating piece. The outer regulating piece was bent inward, and the inner edge of the outer regulating piece was formed with an oblique side that was closer to the inner regulating piece toward the tip end, and a reinforcing rib was formed at or near the outer regulating piece.

[Effect]

In the concrete form spacing holder configured as described above, when the formwork is opened and pressure is applied during concrete pouring, a force is applied to the formwork in the direction of the spacing holder body due to the action of the hypotenuse. do.

〔Example〕

The first embodiment embodying this idea will be described below.
This will be explained based on the diagram and FIG. An upper inner regulating piece 2 extending upward and a lower inner regulating member 3 extending downward are bent at right angles to the main body 1 on both side edges of the central portion of the rectangular spacer main body 1 . At both ends of the spacer main body 1, a formwork fitting gap corresponding to the formwork thickness a (see Fig. 3) is provided between the inner regulating pieces 2 and 3 on both side edges of the main body 1. A pair of outer regulating pieces 4, 5, 6, and 7 are bent in the same direction as the inner regulating pieces 2 and 3, respectively.

A perforation-like recess 1a extending in a direction perpendicular to the longitudinal direction of the main body 1 is formed on the upper surface of the main body 1 to correspond to the inner surface of the formwork to be described later, and the tip portion can be broken off from there.

Further, at the tip of the inner edge of each of the outer regulating pieces 4 to 7, an oblique side 9 is formed which approaches the inner regulating pieces 2 and 3 as the tip ends. Furthermore, two reinforcing ribs 8 are press-molded at both ends of the spacing retainer from the tips of one of the outer regulating pieces 4 and 5 through the main body 1 to the tips of the other outer regulating pieces 6 and 7. . Note that 1b is a hole into which a pin (not shown) is inserted, and a square lumber or the like is inserted between the pin inserted into hole 1b and the outer end surface of the formwork to receive the formwork. .

Next, a method of using the spacing retainer of this embodiment will be explained with reference to FIG. A bottom plate 20 is placed on the chestnut stone S at the bottom of the hole H, and a substantially M-shaped base block 21 is fixed on the bottom plate 20. A base formwork 22 is placed horizontally at both ends of the base block 21. A spacing holder 23 different from this embodiment is placed on the base block 21, and the spacing holder 23 maintains the distance between the lower ends of the pair of lower formworks 10, 11.

In this state, the spacing holder of this embodiment is installed between the upper ends of both lower formworks 10 and 11. In other words, when the lower formwork fitting gap is externally fitted to the upper end of the lower formworks 10, 11, the inner surfaces of the upper ends of both the lower formworks 10, 11 are respectively locked by the inner regulating pieces 3, and the lower formworks 10, 11 is regulated, and the reinforcing ribs 10a of both lower formworks 10, 11,
11a are respectively locked to the oblique sides 9 of the outer regulating pieces 6, 7, thereby restricting the outward movement of both the lower formworks 10, 11, and positioning the lower formworks 10, 11. Next, when the lower ends of the pair of upper formworks 12 and 13 are respectively fitted into the formwork fitting interval on the upper side of the spacing holder, both upper formworks 12 and 1
3 The inner surface is locked to the inner regulating piece 2, and
The auxiliary ribs 12a, 13a are respectively engaged with the oblique sides 9, and the upper formworks 12, 13 are positioned.

If concrete is poured between the upper formworks 12 and 13 and between the lower formworks 10 and 11 in this state, the base part of the foundation concrete and the cloth foundation part can be molded at the same time. After concrete hardens, upper formwork 12, 13, lower formwork 10, 11
Then, the base formwork 22 is removed, and both ends of the spacer are cut off at the perforated recesses 1a.

Then, in the state before concrete is poured between the formworks and hardened, each formwork 10 to 1
Strong outward opening pressure is applied to the inner surface of 3,
An outward pressing force acts on the outer regulating pieces 4 to 7 through the reinforcing ribs 10 a to 13 a of each formwork 10 to 13, and the upper end edge of each reinforcing rib 10 a to 13 a comes into contact with the oblique side 9. You will have to forcefully press the contact area.
Here, since the oblique side 9 is closer to the inner regulating pieces 4 to 7 toward its tip end, the formworks 10 to 13 are subjected to a force that moves toward the spacer main body 1 side due to the outward pressure. act. Therefore, the upper and lower formwork 1
0 to 13 through the spacer body 1, and as a result, the connection between the upper and lower formwork becomes stronger, and the outward force is applied to the outer regulating pieces 4 to 7. can be reduced. Therefore, unlike the conventional method, there is no need for metal fittings for connecting and fixing the upper and lower formworks, and the number of parts can be reduced.

In addition, reinforcing ribs 8 are provided at the outer regulating pieces 4 to 7.
are formed, and the strength against the outward opening pressure can be further improved by the action of the reinforcing ribs 8. Therefore, sufficient spacing can be achieved without using thick metal plates or expensive materials. The strength of the holder can be ensured.

FIG. 2 shows a second embodiment of this invention, in which upper and lower outer regulating pieces 4, 6,
Ribs 8 extending along the longitudinal direction of the spacer body 1 are press-molded at both ends of the spacer body 1 between the spacers 5 and 7. The operation is similar to that of the first embodiment.

Although not shown, the main body 1 is provided only at the corner between the spacing retainer main body 1 and the outer regulating pieces 4 to 7.
Forming reinforcing ribs extending in a direction perpendicular to the longitudinal direction, forming reinforcing ribs only on the outer regulating pieces 4 to 7, changing the number of reinforcing ribs, or providing reinforcing ribs in a lattice or diagonal shape. Alternatively, the oblique side 9 may be formed from the base end to the distal end of the outer regulating piece as shown by the two-dot chain line in FIG.

[Effect of idea]

As exemplified in the above embodiments, this invention differs from the conventional method in that the oblique side formed on the outer regulating piece acts in the direction of connecting the upper and lower formwork against the outward opening pressure. This eliminates the need for metal fittings to connect and fix the parts, reducing the number of parts required for concrete pouring.Furthermore, reinforcing ribs are formed on or near the outer regulating piece, eliminating the need for thick or expensive materials. The strength can be improved even if the concrete is used, thinner materials can be used, and concrete leakage can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a spacer according to a first embodiment embodying this invention, FIG. 2 is a perspective view showing a second embodiment, and FIG. 3 is a sectional view showing a state in use. Spacer main body 1, inner regulating pieces 2, 3, outer regulating pieces 4-7, reinforcing rib 8, oblique side 9, concrete formwork 10-13.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In order to maintain the spacing between concrete formworks installed facing each other, a concrete formwork spacing holder interposed between the concrete formworks is provided with a strip-shaped spacing maintenance device. Concrete formwork 1 facing opposite at least one side edge of the tool body 1 approximately in the center
an inner regulating piece 2 that regulates between the inner surfaces of 0 to 13;
3 is bent to the main body 1, and a formwork fitting interval corresponding to the thickness a of the formworks 10 to 13 is provided at both ends of the main body 1 between the inner regulating pieces 2 and 3. The outer regulating pieces 4 to 7 are bent in substantially the same direction as the inner regulating pieces 2 and 3, and the inner regulating pieces 2 and 2 are formed on the inner edges of the outer regulating pieces 4 to 7 toward the tip.
3, and an auxiliary rib 8 is formed at or near the outer regulating pieces 4 to 7. 2. The concrete form spacing according to claim 1 of the utility model registration claim, in which the inner regulating pieces 2, 3 and the outer regulating pieces 4 to 7 are formed on both side edges of the spacing holder main body 1 so as to face oppositely to each other. Retainer.