JPS5854521Y2 - Intermediate bar of separator for concrete formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermediate bar of a separator for concrete formwork that is fixedly mounted across a pair of opposing joint stands that can be locked and fixed to the concrete formwork.

In a conventional intermediate bar of this kind, the strip plate has a U-shaped cross-section with an upward opening, and opposing side walls forming this U-shape are located relatively long apart in the width direction of the intermediate bar. It was constructed by bending it to the desired condition.

During the hardening of the poured concrete, as the water content oozes upward over time, conversely, concrete components such as sand and cement descend from above. However, since the opposite side walls are located relatively long apart, the concrete component guided down along the outer surfaces of the opposite side walls has a width that extends to the area where the opposite side walls are integrally connected at the lower ends of each side. It is not possible to wrap around the bottom of the intermediate bar, which is relatively long in the direction, and as a result,
A void S corresponding to the volume of rising water was created below the bottom, reducing the strength of the hardened concrete wall (see Figure 5).

In addition, the intermediate bar has the function of pulling and supporting the opposing formwork on both sides of the space equivalent to concrete pouring through the joint tables connected to both ends of the intermediate bar in the longitudinal direction. Although high tensile strength is required, bending strength and torsional strength in the transverse direction with respect to the longitudinal direction are not so required. It would be uneconomical in terms of materials to configure them in a U-shaped cross section in a separated state.

In consideration of these problems, the present invention has been developed to achieve economical use of materials, have sufficient tensile strength, and avoid the formation of voids below the concrete during concrete pouring. It is intended to provide a bar.

The intermediate bar of the separator for concrete formwork according to the present invention is composed of two sheets, each of which is made by folding a strip plate in half in its width direction. A plurality of connecting pin insertion holes are formed in the intermediate bar, and both ends of the intermediate bar are connected to the pair of opposing joint bases by the connecting pins using the connecting pin insertion holes. It is characterized by

According to this, both side walls are in contact with each other, and the thickness of the entire intermediate bar in the width direction is smaller than that of the conventional bar, so while it has sufficient tensile strength, During the curing process, as the moisture content rises, the concrete components that are guided down along the outer surfaces of both walls can smoothly wrap around and penetrate below the folded lower surfaces of the lower ends of both walls. , the generation of voids as described above is avoided.

Therefore, hardened concrete walls can be constructed with great strength.

Moreover, the width of the band-shaped plate that is the material forming the intermediate bar can be smaller than that of the conventional one, and it is possible to reduce the cost in terms of materials.

Furthermore, as mentioned above, the intermediate bar of the present invention has a structure in which connecting pin insertion holes are provided along the entire length of the intermediate bar in the longitudinal direction. Correspondingly, even a single type of intermediate bar has a significant practical effect, as it can be conveniently used by cutting it to any required length.

Incidentally, if a cylindrical portion extending over the entire length of the bar in the longitudinal direction is integrally formed in the folded portion, bending resistance and torsion resistance can be ensured.

In this case, since the outer circumferential surface of the cylindrical portion has a smooth arc shape, there is no problem with the concrete component entering the circumferential surface downwardly.

Hereinafter, embodiments of the present invention will be described based on the drawings.

One end has a flat plate-shaped locking part 1 inserted between the abutting end surfaces of vertically adjacent metal box-shaped concrete formworks 6, 6, and the other end has an intermediate bar with an upwardly opening U-shaped cross section. In a joint base 3 made of steel or stainless steel having a connecting portion 2, a U-clip insertion hole 1a is bored approximately in the center of the locking portion 1, and opposite side walls 2a, 2a of the connecting portion 2 are provided. A plurality of pairs of connecting pin insertion holes 2b, 2b are bored at the same phase position at appropriate intervals along the longitudinal direction of the connecting part 2, and between the locking part 1 and the connecting part 2. , a perforation-like cutting line 3a is recessed.

4 is two joint stands 3, 3 configured as described above.
An intermediate bar that is to be fixedly attached to each other in between is a long flat steel strip plate 4A, which is folded in two at the middle in the width direction, and the folded side walls 4a, 4a are They are arranged so that they overlap and face each other.

A pair of connecting pin insertion holes 4b, 4b are formed in the opposing side walls 4a, 4a of the intermediate bar 4 at the same phase position along the longitudinal direction of the bar 4, at an interval between the adjacent holes 2b, 2b in the connecting portion 2. A plurality of sets are drilled at intervals larger than that.

Both ends of the intermediate bar 4 in the longitudinal direction are fitted from above into the connection parts 2, 2 of the two joint stands 3, 3, respectively, and are inserted into a plurality of pairs of holes 4b, 4b, 2b, 2b, .
Match the phases of appropriate ones among them, insert the headed connecting pins 5, 5 in common, and connect the three parts 4, 3.
．． 3 are connected to each other to constitute a separator A.

This separator A is attached to the locking portions 1, 1 at both ends in the longitudinal direction.
6.6...
The peripheral side plates 5 a , 5 a ... are inserted between the abutting end surfaces of the peripheral side plates 5 a , 5 a .
U formed through the abutment part of a in the vertical direction
Clip insertion holes 6b, 6b... and locking parts 1, 1
The holes 1a, 1a are phase matched, and these base holes 6b, 6
Insert and lock the U clips 7.7 into b, la..., and connect the adjacent formworks 6゜6...to the connected formworks 6, 6 at the same time. A separator A is fixedly connected to the opposing formwork 6, 6, and so on.
...to be towed and supported.

Then, when concrete is placed between the opposing formworks 6, 6, the moisture content rises while the concrete hardens, and along with this, concrete components such as sand and cement fall. .

This component is smoothly guided down along the outer surfaces of the opposite side walls 4a, 4a of the intermediate bar 4, and the both side walls 4a,
When reaching the lower end folded part of 4a, it smoothly wraps around and enters below the folded part along the smooth curved outer surface of the folded part, and no gap is created below the intermediate bar 4.

The same applies to the joint stands 3, 3.

Note that when the formwork 6 is dismantled after the concrete has hardened, the locking portions 1 exposed from the concrete wall will be removed.
1 along the cutting lines 3a, 3a.

The length of separator A is 4 through which the connecting pins 5, 5 should be inserted.
This is done by selecting b, 4 b, 2 b, 2 b... The cylindrical portion 4C is integrally formed.

In this case as well, the concrete components can effectively wrap around and enter the lower part of the bar 4.

FIG. 5 shows a conventional bar in which both side walls 4a', 4a' of the intermediate bar are configured to be long apart in the width direction.
It shows a state where a large gap S is generated below it.

[Brief explanation of the drawing]

The drawings show an embodiment of the intermediate bar of the separator for concrete formwork according to the present invention, and Fig. 1 is a plan view of the intermediate bar connected to the formwork with joint stands connected to both ends, and Fig. 2 is a longitudinal side view of the same. FIG. 3 is a longitudinal sectional front view taken along the line III-III in FIG. 2, and FIG. 4 is a longitudinal sectional front view according to another embodiment. Incidentally, FIG. 5 is a longitudinal sectional front view showing a conventional one. 3... Joint stand, 4A... Strip plate, 4C... Cylindrical part, 6... Concrete formwork.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ An intermediate bar of a separator for concrete formwork that is fixedly mounted between a pair of opposing joint stands 3, 3 that can be locked and fixed to the concrete formwork 6, , consists of a two-layered sheet formed by folding the strip plate 4A in half in its width direction, and has a large number of connecting pin insertion holes 4b, 4b along its entire length at predetermined intervals along its longitudinal direction.
. . . are bored, and these connecting pin insertion holes 4b, 4b
An intermediate bar for a separator for concrete formwork, characterized in that both ends of the intermediate bar are connected to the pair of opposing joint stands 3, 3 by means of connecting pins. ■ The intermediate bar of the separator for concrete formwork according to the utility model registration claim 2, in which cylindrical portions 4C are integrally formed in the folded portion of the band plate 4A along the entire length of the bar in the longitudinal direction.