JPH0246976Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is based on lightweight aerated concrete (hereinafter referred to as ALC).
This invention relates to a device for preventing a large number of set pins supporting reinforcing reinforcing bars arranged in a mold from idly rotating at times other than when the set pins are being removed.

[Conventional technology]

In the process of manufacturing ALC, in order to position the reinforcing reinforcing bars in the mold, reinforcing reinforcing bars are inserted into the necessary locations among the many holes drilled in a bridge suspended at right angles to the longitudinal direction of the upper edge of the mold. A supporting set pin is inserted vertically, and the reinforcing reinforcing bars are held by this set pin.Then, the raw material slurry is injected into the mold, and after foaming and semi-hardening, the set pin is removed, and the mold is cut to a predetermined size and then cured in an autoclave. It is used as a product.

There are several methods for holding reinforcing reinforcing bars with set pins, among which a set pin with a circular cross section is partially provided with a protrusion, or a part of the set pin is oval in cross section, and the set pin of the reinforcing reinforcing bar is inserted through the set pin. Using an oval or rectangular hole, insert the set pin so that the protruding part of the set pin matches the long axis direction of the reinforcing bar insertion hole, and then lock the reinforcing bar to the set pin by turning the set pin approximately 90 degrees. There is a way to do it. In this case, when removing the set pin from the foamed semi-hardened concrete, it is necessary to turn it 90 degrees from the direction in which it was set.

[Problem that the invention attempts to solve]

However, if it is necessary to turn the set pin 90 degrees and remove it as described above, after setting the reinforcing reinforcing bars in the mold, before removing the set pin, do not allow the set pin to rotate due to vibration or other external forces during foaming of the concrete. In addition, conventionally, the set pin and bridge were not provided with a special set pin rotation stopper, so there was a high risk of defective products due to reinforcing reinforcing bars falling off due to the set pin's movement.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a device that can very easily prevent the set pin from rotating loosely.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing a state in which reinforcing reinforcing bars are conventionally held in a formwork for ALC manufacturing using set pins, with A being a side view and B being a plan view. Fig. 2 is a perspective view showing a state in which a flat bar as a set pin rotation prevention device according to the present invention is provided on a bridge for positioning the set pin, Fig. 3 is a diagram showing a part of the bridge and the set pin, and A is a plan view; B is a cross-sectional view of the bridge. FIG. 4 is a side view of one embodiment showing the end face of the flat bar, and FIG. 5 is a perspective view of another embodiment.

In Fig. 1A, the cage-shaped reinforcing steel 1 is connected to the formwork 2.
A set pin 4 is inserted through a hole provided along the longitudinal direction of the bridge 3 placed over the bridge 3.
Positioned and held by 5 is an eccentric head provided on the top of the set pin 4;
A protrusion 6 is provided on the upper surface of the set pin 4 so as to be eccentric from the central axis of the set pin 4. The insertion hole 7 of the set pin 4 of the reinforcing reinforcing bar 1 has a rectangular shape, for example, as shown in FIG. After passing the set pin 4 through this hole by aligning the long axis of the insertion hole 7 with the long axis of the insertion hole 7, the protrusion 8 is caught in the hole 7 by turning the set pin approximately 90 degrees, and the reinforcing bar 1 is inserted into the formwork 2. It is hung and fixed. 1st
Figure B shows a state in which reinforcing reinforcing bars are set in the formwork 2 by the method described above using a plurality of bridges 3, and the raw material slurry is poured and foamed. facing. In FIG. 2, a flat bar 9 with a rectangular cross section is placed along the longitudinal direction of the bridge 3 at approximately the center in the width direction, and both ends thereof are exposed to the action of a spring, as shown in FIG. 4 or 5. This makes it possible to move in the width direction. As a specific example of a method of holding the flat bar 9, as shown in FIG. 4, a U-shaped metal fitting 10 is straddled over the end of the flat bar 9 and fixed at the center in the bridge width direction, and a horizontal hole 11 provided at the end of the flat bar is used. A round bar 12 is loosely fitted into the housing, coil springs 13 are mounted on both protrusions of the round bar 12, and both ends of the round bar 12 are fixed to U-shaped metal fittings by welding or the like. In the example shown in FIG. 5, a round bar 12 is passed through and fixed to the end of the flat bar 9, and is made to protrude from a U-shaped metal fitting 10 fixed at the center in the width direction of the bridge, between the part and the round bar end stop plate 14. coil spring 1
3.

FIG. 3 shows the relationship between the head of the set pin 4 and the flat bar.
A side surface 16, which is perpendicular to the cross-sectional long axis direction of the intermediate protrusion 8 of the set pin, is cut out in a perpendicular plane. Reference numeral 7 denotes a lifting prevention device provided directly below the protrusion 6.

[Effect]

In the device according to the present invention, the set pin is inserted into the hole at the desired position of the bridge, the protrusion at the middle or tip of the set pin is passed through the rectangular or oval hole in the spacer part of the reinforcing reinforcing bar, and then the set pin is rotated at a 90° angle. When rotated, as shown in FIG. 3, the flat surface 16 of the notch on the side of the cylindrical portion 15 with a large diameter at the top of the set pin comes into contact with the side surface of the flat bar 9, and this flat bar is rotated by the action of springs provided at both ends. Since the set pins are held approximately at the center in the width direction of the bridge 3, free rotation can be prevented even if temporary weak rotational force is applied to the individual set pins during casting of raw material slurry.

Also, when pulling out the set pin from the mold,
Insert the set pins individually in the direction of arrow C in Figure 3A.
Alternatively, if the flat bar is rotated all at once, the flat bar will be pushed on the bridge in the direction opposite to the side where the set pin is located, and if the bridge is lifted in this state, the reinforcing reinforcing bar and the set pin will be disengaged and the set pin can be pulled out. Can be done.

The bridge 3 has a large number of set pin insertion holes on both sides in the width direction, but if the flat bar of the present invention is provided, when the set pin is rotated 90 degrees, if the set pin is placed on the other side, the set pin will not be able to move freely. The placement is limited to one side of the bridge.

In order to further strengthen the prevention of free rotation of the set pin, a vertical protrusion is provided near the center of the plane of the notch of the set pin, and a fitting groove is provided at a position corresponding to this protrusion on the flat bar. You can also do it.

[Effect of idea]

As explained in detail above, according to the present invention,
In the ALC manufacturing process, it is possible to completely prevent the set pins for holding the reinforcing reinforcing bars of the mold from rotating loosely due to external forces other than when the mold is being removed, resulting in defective products due to the reinforcing reinforcing bars falling off from the set pins. It is possible to eliminate the occurrence of , and the effect is great.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing a state in which reinforcing reinforcing bars are held in a conventional ALC manufacturing formwork, where A is a side view, B is a plan view, and Fig. 2 is an embodiment of the set pin rotation prevention device according to the present invention. FIG. 3 is a perspective view showing a part of the bridge and set pin, A is a plan view, and B is a sectional view. FIG. 4 is a side view of one embodiment of the flat bar, and FIG. 5 is a perspective view of another embodiment. 1... Reinforcement bar, 2... Formwork, 3... Bridge, 4... Set pin, 7... Insertion hole, 9... Flat bar, 10... U-shaped metal fitting, 13... Coil spring.

Claims (1)

[Scope of utility model registration request] A set pin for supporting reinforcing reinforcing bars suspended in an ALC mold A spring mounted on both sides of a round bar placed along the center of the bridge in the width direction and perpendicular to both ends of the bridge. The set pin consists of a flat bar that is movably supported by the set pin, and a set pin in which a notch is provided in the cylindrical portion of the set pin that protrudes from the upper surface of the bridge and has a notch that has a surface perpendicular to the protruding direction of the lower protrusion of the set pin. A device for preventing rotation of an ALC reinforcing reinforcing bar set pin, which is configured such that the notch and the widthwise side surface of the flat bar are in contact with each other when the set pin is in a stopped state.