JPS5929085Y2 - Joint structure of concrete separator - Google Patents

Description

[Detailed description of the invention] The present invention is inserted between peripheral protruding plates of adjacent concrete forms, and inserted into locking holes formed in the opposing peripheral protruding plates. Improvement of the connection structure for the locking hole of a joint part of a flat plate-shaped concrete separator that is detachably held and held via a pin, or a flat plate-shaped joint exclusive member having an intermediate bar connection part at one end part. Regarding.

The separator is used to pull and support the formwork against the lateral pressure of the concrete poured on the inner surface of the formwork. It is received by direct contact between the pin inserted through the pin and the periphery of the pin hole formed in the joint part inserted through this pin or the joint-specific member (hereinafter collectively referred to as the joint part). .

The joint part is constructed with a fairly thin wall (approximately 1 mm) in order to minimize the gap created between the two protruding plate parts and prevent the poured concrete from seeping out. Since the contact area of the joint with the pin hole periphery is very small, this periphery is subject to outward expansion deformation (collapse) due to the lateral pressure of the poured concrete.
There is a risk that cracks may occur in the width direction and the formwork may be displaced outward, or the joint portion may be broken and the formwork may become loose.

Therefore, in the past, the width of the joint was made considerably larger to prevent the formwork from being displaced outward or the joint from breaking even if an expansion displacement crack occurred at the periphery. Efforts were made to increase the breakage resistance of this part, but this resulted in an increase in cost due to the large size of the separator material, and it was extremely uneconomical as the separator was buried in the concrete and could not be used for other purposes.
It's unreasonable.

Therefore, in order to solve this problem, the present applicant, when forming a pin hole in the joint part, integrally removes the cylindrical part that fits into the locking hole of one of the protruding plate parts from this joint part. It was previously proposed to form pin holes by punching (see Japanese Patent Application No. 101598/1982).

According to this, when the lateral pressure of the poured concrete 1 is applied, the area of contact between the peripheral edge of the pin hole and the pin is increased by the amount of the cylindrical part. When viewed in the orthogonal direction, the radius of the pin hole (several times the wall thickness of the joint) also increases, so the load per unit area can be made extremely small, reducing the expansion and deformation of the pin hole periphery. Can prevent cracks.

Therefore, the required width of the joint part to obtain the same breaking strength as the conventional one can be made smaller than that of the conventional one, and the cylindrical part is not attached by welding or other means to a separate member. Since it is integrally formed by stamping, it is easy to process, and this combined with the reduction in materials and ease of processing has the effect of reducing costs.

However, even with such means, there is a limit to how much material can be saved.

In other words, if the width and wall thickness of the joint are made smaller with the aim of further reducing costs, there will be no problem with expansion deformation of the peripheral edge of the pin hole, but the width and thickness of both sides of the joint and the tube will be reduced. This is because the tensile strength of the area between the shaped portion becomes smaller and cracks occur in the width direction at this area.

The reason for this limitation is that the concrete lateral pressure acts intensively only on the cylindrical portion.

The joint of the concrete separator according to this invention is
Based on this fact, in addition to punching out a cylindrical part to form a bottle hole in the joint part (including joint-specific members), we also installed a peripheral protrusion of the concrete formwork at the outer end of the joint part. A distinctive feature lies in the continuous arrangement of bendable hook pieces that can be hooked to the outer edge of the plate.

According to this, the concrete lateral pressure can be received in a shared manner by the cylindrical portion and the bent latching piece.
In other words, the total pressure of the concrete side pressure is not concentrated on the cylindrical part, so even if the width of the joint part is made smaller, or the wall thickness of the joint part, and by extension the wall thickness of the entire separator, is made smaller. However, it is possible to reliably prevent cracks from forming between the cylindrical portion and both sides of the joint portion.

In this way, according to the present invention, although it is an extremely simple structural improvement of just bending and forming a small hook piece on the outer end of the joint part, it achieves the desired result compared to the previously proposed one. It has become possible to further reduce the width or thin the wall of the strip material used while providing breakage resistance, and as a result, it has become possible to provide a separator that is buried and cannot be used for other purposes at a very low cost. .

Embodiments of the present invention will be described below based on the drawings.

The separator A has joint parts 1, 1 at both longitudinal ends of a single flat rectangular band-shaped metal plate made of hardened steel or stainless steel, and both joint parts 1, 1. The part between is in the direction perpendicular to the board surface,
Rib 2 for tensile reinforcement by integrally projecting with a press
, and a cylindrical portion 3 , 3 is formed approximately at the center of both joint portions 1 , 1 in the same direction as the protruding direction of the rib 2 .
are integrally molded by stamping, and pin holes 4, 4 are formed inside the cylindrical parts 3, 3.

At the outer ends of both the joint parts 1, 1, there are hooking pieces 5, 5 which can be hung on the outer end sides of peripheral protruding plate parts 5a, 5a of the formworks 6, 6, which will be described later. They are integrally connected by bending.

The locking pieces 5,5 at both ends are configured to have a width smaller than the width of the joint parts 1,1, and both curved locking pieces 5.5,
They are located near the opposite ends in the width direction.

Reference numeral 6 denotes a metal box-shaped concrete formwork, and a locking hole 6b is bored in a peripheral protruding plate part 6a.

In order to hold the separator A in the upper and lower adjacent formworks 6, 6, as shown in FIG. Locking hole 6b
and the hooking piece 5 is fitted into the protruding plate part 6.
a, and then place the protruding plate part 6a of the upper formwork 6 against the joint part 1 with its locking hole 6b matching the bottle hole 4. Place the pin (U clip) 7 through each hole 6 b , 4 , 6 b , and tighten the pin 7 to close the join + part 1 .
is inserted between both the upper and lower protruding plate parts 5 a and 6 a and held in a tightened state.

The joint portion 1 on the other end side is held in the same manner.

In addition, the hanging pieces 5, 5 may be bent in the opposite direction to the punching direction of the cylindrical parts 3, 3, and may be hung on the upper formworks 6, 6.

Also, attach the hooking pieces 5, 5 to the joint part 1.1 as shown in Fig. 4.
It may be provided in the center of the width of the gold mine, or it may be provided over the gold mine as shown in FIG.

However, in the case shown in Fig. 1, when manufacturing a large number of separators A by cutting them from one long strip material as shown by the imaginary line, cutting can be performed to save material, resulting in cost reduction. Helpful.

Furthermore, as shown in FIG. 6, a large notch may be made at the outer end of the joint portion 1, and a hooking piece 5 may be formed at the tip of the remaining narrow plate portion 1'.

FIG. 7 shows another embodiment in which a separator A is connected to a pair of flat plate joint members A, , A, and connecting portions a1. It is composed of an intermediate bar A2 connected via pins 8, 8 between A1 and A2, and a sealing piece 5 similar to the above example is attached to the outer end of the dedicated member A.
5 are bent and arranged in a row.

Although not shown, there are pins 7 for locking and holding the protruding plate parts 5 a and the joint part 1 or the special member A1.
In addition to the above-mentioned U-clip, it may also be a bent end portion of a home tie for holding formwork supports (such as end pieces) to the assembled formwork 6.

[Brief explanation of drawings]

The drawings show an embodiment of the joint structure of a concrete separator according to the present invention, and FIGS. 1 and 2 are a side view and a plan view of the separator, and FIG. 3 is a vertical side view of the assembled state.
4 and 5 are partial perspective views of different embodiments, FIG. 6 is a plan view of yet another embodiment, and FIG. 7 is a vertical sectional side view showing deformation of the separator. 1... Joint part, 3... Cylindrical part, 4... Pin hole, 5... Bending hook part, 6...・Formwork, 6a...Protruding plate part, 6
b...Locking hole, 7...pin, A...
...Separator, AI...Joint-specific member, al...Intermediate bar connection part.

Claims (1)

[Scope of claim for utility model registration] ■ Peripheral protruding plate portions 6a of adjacent concrete formworks 6, 6;
6a, and is removably retained via pins 7 inserted into locking holes 6b, 6b formed in the opposing peripheral protruding plate parts 5a, 5a. One of the locking holes 6b, 6b of the joint part 1 of the flat plate-shaped concrete separator A, or the flat plate-shaped joint exclusive member A1 having an intermediate bar connection part a1 at one end, is placed at a location corresponding to the locking holes 6b, 6b. A pin hole 4 is formed by punching out the cylindrical portion 3 which is fitted into the stop hole 6b, and a peripheral protruding plate portion 6a of the concrete formwork 6 is attached to the outer end of the cylindrical portion 3.
A joint part structure of a concrete separator, characterized in that a bent hanging piece 5 which can be hung on the outer edge side is arranged in a row. (2) The joint part structure of a concrete separator according to claim (2), wherein the bending hook piece 5 is formed to have a smaller width than the width of the joint part 1 or the joint exclusive member A1. .