JP3316079B2 - Manufacturing method of hardened lightweight cellular concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cured product of lightweight cellular concrete (hereinafter referred to as ALC).

[0002]

2. Description of the Related Art Conventionally, as a method for producing an ALC cured product, a rod pin is hung on a portal-shaped supporting means installed on an upper portion of a formwork, and a reinforcing bar cage is fixed to the rod pin. It is well known that a basket is set, then an ALC material containing a foaming agent is poured into a mold, and then the material is foam-hardened.

[0003]

SUMMARY OF THE INVENTION
When the cured LC is cut into a panel and the cured product is steam-cured, a panel useful for building materials is obtained.
Although rare, there is a crack runs in the horizontal streak direction of the panel which constitutes the reinforcing cage in the panel. An object of the present invention is to provide a method for producing an ALC cured product capable of suppressing such cracks.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a raw material for lightweight cellular concrete is poured into a form in which a reinforcing cage is set via a rod pin, and then the raw material is foam-hardened. In the method for producing a hardened lightweight cellular concrete, a rod pin having a bar-shaped guide portion at a lower portion having a hook portion for locking the reinforcing bar is used as the rod pin, and the raw material is poured into the formwork. Then, when buoyancy begins to act on the rod pin due to foaming of the raw material, means for releasing the reinforcing bar cage from the hook portion and allowing the reinforcing bar cage to float along the rod-shaped guide is adopted. .

[0005]

When the upper surface of the ALC raw material placed in the mold starts to foam and harden and the upper surface thereof rises with time, the engagement between the reinforcing bar and the rod pin is released. Then, the reinforcing bar starts to float in the foamed hardened material, and does not show resistance to the rise of the foamed hardened material up to a predetermined distance. Furthermore, when the foam hardening of the raw material approaches the end, the gas in the foam hardened material starts to escape, and the foam hardened material itself slightly shrinks. The upper surface descends with the contraction. Even at this time, the reinforcing cage is released from the rod pin, so that the squirrel cage is settled down to a stable place without showing resistance to shrinkage of the foamed hardened material. Therefore, no distortion occurs between the portion where the reinforcing bar exists and the portion where the reinforcing bar does not exist. Therefore, the cause of the occurrence of cracks in the direction in which the horizontal streaks of the reinforcing cage run in the finally obtained cured product is eliminated.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. In the present invention, a method of manufacturing an ALC cured product in which a raw material of ALC is cast into a mold in which a reinforcing bar cage is set via a rod pin, and then the raw material is foamed and hardened, is exactly the same as the conventional technology. That is, as shown in FIG. 1, a gate-shaped rod pin supporting means 19 is installed on an upper part of a mold (not shown) (in FIG. 1, only a part of the upper part of the rod pin supporting means is drawn). .

The rod pin support means 19 rotatably supports a rod rod 20 having a handle 21 attached to the upper end thereof. From the lower end of the rod pin 20, an elliptical column-shaped guide portion 22 having a considerably smaller diameter extends downward. Here, the equivalent diameter means the diameter when the cross-sectional area is converted into a circle having the same area as the area. Two semi-annular locking projections 23 are provided in the middle of the guide portion 22 as hook portions at predetermined intervals in the vertical direction as hook portions so that a reinforcing cage described later can be locked between them. Has become.

The reinforcing bar cage 11 set in the form via the rod pins 20 is basically knitted in a cage shape by separating two mats 14 by a predetermined distance by a pair of upper and lower spacer reinforcing bars 24 and 25. ing. The cloak 11 is composed of two horizontal streaks 12 extending in the horizontal direction at an interval, and a plurality of vertical streaks 13 extending vertically to the horizontal streaks.

The upper spacer 24 is composed of two parallel main reinforcing bars 15 and a pair of locking reinforcing bars 17 which are welded and fixed at an intermediate portion of the main reinforcing bars 15 in the same direction as the horizontal reinforcing bars 12 at predetermined intervals. Similarly, the lower spacer 15 is also composed of a main reinforcing bar 16 and a locking reinforcing bar 18.

In the upper spacer 24, the quadrilateral surrounded by the main reinforcing bar 15 and the locking bar 17 is sized to allow the rod pin 20 to pass through. The quadrilateral surrounded by the main reinforcing bar 16 and the locking reinforcing bar 18 can pass through the guide portion 20 when the rod pin 20 is set at a predetermined angular position by the handle 21 and is turned 90 degrees from the angle. At this time, it is sized to be locked to the locking rebar 18 by the locking projection 23 of the guide portion 20.

After setting the reinforcing bar 11 in the form with the reinforcing bar 23 locked on the locking projection 23 of the rod pin 20 having the above structure, the ALC raw material containing a foaming agent such as aluminum powder in the form. , The AL over time
The C raw material is foam-hardened, and the foam-hardened material expands in volume as shown by a curve a in FIG. With the expansion of the foamed hardened material, the rebar basket 11 is shown by the curve b in FIG.
Receives buoyancy when it reaches point A in. as a result,
The rod pin 20 is also pushed upward.

Then, the movement of the rod pin 20 is detected artificially, electrically or mechanically, and the handle 21 of the rod pin 20 is turned 90 degrees as shown in FIG. Stopper 26
(See FIG. 1) is locked to the rod pin supporting means 19. Then, the engagement between the locking projection 23 and the locking reinforcing bar 18 is released, and the reinforcing bar cage 11 rises along the guide portion 22 where the locking reinforcing bar 18 reaches the rod pin 20, and the rising trajectory is the curve of FIG. It becomes like b.

[0013] The foaming of the foamed cured product of the ALC raw material is eventually completed, and the hydrogen gas filling the foaming space partially escapes from the foamed cured product, so that the foamed cured product contracts relatively slightly. Therefore, the height of the upper surface of the foamed cured product is slightly reduced.
At this time, the reinforcing bar 11 also slightly lowers without resisting the lowering of the foamed hardened material. Therefore, in the foamed hardened material in the vicinity of the horizontal streak 12 of the reinforcing bar 11, no internal distortion occurs due to the movement of the horizontal streak 12. The foamed cured product is then cut into a suitable shape and size by a well-known method or means to form a panel, and finally, even if steam cured, the internal strain is evident and does not become a crack in the panel. .

The present invention is allowed to be modified and implemented in a part of the above-described embodiments, as long as the effects of the present invention are not significantly impaired by following the fundamental technical concept thereof. For example, when buoyancy is generated in the reinforcing bar cage 11, the rod pin 20 itself and the reinforcing bar cage 11 are formed of a foamed hardened material without rotating the rod pin 20 and without disengaging the locking projection 23 from the reinforcing bar cage 11. You may make it fall without being restrained at the time of contraction. In this case, the position of the hook portion may be shifted upward or downward instead of the intermediate portion of the guide portion. The guide portion may have the same cross section and size as the rod pin. The technical scope of the present invention is to be interpreted broadly including these aspects. Another hook may be used instead of the locking projection 23.

[0015]

As described in detail above, the present invention has an excellent effect of suppressing the occurrence of cracks that easily run in the direction of the horizontal streaks of the reinforcing bar.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a state in which a reinforcing bar is locked to a rod pin in an embodiment.

FIG. 2 is a partial perspective view showing a state in which the rebar cage is unlocked from the rod pin in the embodiment.

FIG. 3 is a diagram showing a relationship between an elapsed time after an ALC raw material is poured into a mold, an elevation of an upper surface of a foamed cured product, and an elevation of a reinforcing cage.

[Explanation of main symbols]

 11 Reinforced basket 20 Rod pin 22 Guide part

Claims (1)

(57) [Claims] 1. A method for producing a cured lightweight cellular concrete material in which a raw material of lightweight cellular concrete is poured into a form in which a reinforcing bar cage is set via a rod pin, and then the raw material is foamed and cured. Using a rod pin having a rod-shaped guide part at the lower part having a hook part for locking the basket in the middle, buoyancy started to be applied to the rod pin by foaming the raw material after the raw material was poured into the formwork. A method for producing a lightweight lightweight concrete concrete, characterized in that the reinforcing bar is released from the hook portion so that the reinforcing bar can float along the rod-shaped guide.