JP2663330B2 - ALC sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an ALC thin plate having a thickness of less than 75 mm, which is used for an outer wall of a building or a waste form.

[0002]

2. Description of the Related Art Conventionally, ALC panels used for walls, roofs, floors and the like of buildings have a thickness of 75 mm or more, and the main body is mainly made of steel. However, recently, ALC panels have been used as outer walls of wooden buildings because of their light weight and excellent heat insulation and fire resistance.
LC sheets have become commercially available. Traditionally, wooden panels have been used as formwork for concrete buildings, but recently it has become difficult to secure a place to dispose of formwork after use, and wooden panels have been used from the standpoint of protecting forest resources. Has become a problem, and ALC sheets have been used as discarded forms.

[0003] As the use of the ALC thin plate has been expanded in this way, a product having better strength, workability, and handleability than the conventional characteristics has been demanded. As a conventional ALC thin plate having a thickness of 35 to 50 mm, for example, FIG.
As shown in (a) and (b), the wire diameter is 0.8 to 1.0 mm and the aperture is 1
Thin plate 1 with metal lath 2 of about 6 × 32 mm as reinforcement
And a wire diameter of 1.3 as shown in FIGS. 6 (a) and 6 (b).
7 (a) and (b), as shown in FIGS. 7 (a) and 7 (b), a reinforcing bar 6 in which a wavy horizontal bar 5 is welded to a main bar 4 having a wire diameter of 2.3 mm. Some are buried.

[0004]

SUMMARY OF THE INVENTION Among these, metal lath 2
The wire with a small diameter is easy to cut because it has a small wire diameter, and has a small aperture so that it is not easily chipped when nailing and has excellent construction properties. On the other hand, since the bending strength is weak, the length is 2 m. When the metal lath 2 is set in a panel manufacturing form, the metal lath 2 cannot be manufactured as shown in FIG.
It is necessary to hold the metal lath 2 between the support pins 7 as described above, and the holes of the support pins 7 may cause a reduction in strength, and the support pins 7 may be hardened before the raw material slurry hardens so that no traces are left. If the metal lath 2 is removed, the position of the metal lath 2 shifts, and there is a problem that the positional accuracy is deteriorated.

[0005] As shown in Figs. 6 (a) and 6 (b), the reinforcing bars 3 in which the reinforcing bars are welded in a grid form are buried as shown in Figs. When the reinforcing bars 3 are set on the panel manufacturing form, it is necessary to sandwich both sides of the reinforcing bars 3 with the support pins 7 in the same manner as described above. There was a problem of lowering. Also, as shown in FIGS. 7 (a) and 7 (b), the panel in which the reinforcing bar 6 in which the corrugated horizontal bar 5 is welded is embedded has a high bending strength, so that a long panel of 3 m or more can be manufactured. As shown in FIG. 7 (c), the supporting pin 7 is inserted into the center of the reinforcing bar 6 when setting it on the manufacturing formwork. As in the case of burying No. 3, there was a problem that the workability was inferior and the manufacturing cost was high.

Furthermore, these conventional panels have a problem that they are easily wetted because the one-sided water absorption rate of 48 hours is as high as 10% or more, and when used as an outer wall of a building, they are liable to be deteriorated by water absorption or to suffer from frost damage. In addition, when used as a concrete formwork, it is necessary to provide an insulating layer on the concrete injection surface, and there is also a problem that concrete splashes are liable to adhere and it takes time to remove them.

[0007] The 48-hour value of this one-sided water absorption is A
This is a value measured by a method of measuring a water absorption coefficient (one-sided water absorption) by LC Research Society.

An object of the present invention is to provide an ALC thin plate having high bending strength, good workability, and low wettability.

[0009]

The thickness of the present invention is 75 mm.
In the ALC thin plate of less than two, two or more main reinforcements are arranged in parallel in the same plane in the longitudinal direction so as to be stepped alternately, and the horizontal reinforcements are fixed to all the main reinforcements in the width direction so as to be orthogonal to the main reinforcements. In the thickness direction, a reinforcement having a wire diameter of 1.0 to 3.0 mm, an interval between main bars of 50 mm or less, and an interval between horizontal streaks of 75 mm or less is formed in each of the 6 to 12 steps. It is designed to be buried near the center.

Further, this thin plate has a one-sided water absorption of 48 hours of 5% or less.

[0011]

[Function] As reinforcing bars, the wire diameter is small, the interval between them is small, and 6 to 12 steps are provided alternately, so that the bending strength is strong and the workability is good, and the panel is almost uniform everywhere. Characteristic can be obtained. The number of steps is desirably an even number so as to be symmetric with respect to the center line in the thickness direction. When the wire diameter of the reinforcing bar is 1.0 mm or less, the strength is insufficient, and when the wire diameter is 3.0 mm or more, the workability such as cutting is deteriorated. Further, when the interval between the main streaks is 50 mm or more and the interval between the horizontal streaks is 75 mm or more, the strength is insufficient and uneven. Further, it is preferable that the reinforcing bars are arranged near the center in the thickness direction of the reinforcing bars so that the reinforcing bars do not appear on the surface of the thin plate. The number of steps refers to the number of horizontal portions in the width direction. When the number of steps is six or less, the main reinforcement in the thickness direction is not uniformly arranged. It takes time and effort to install.
Further, when the 48-hour value of the water absorption of one surface of the panel is set to 5% or less, desirably 2% or less, it is possible to prevent water absorption and frost damage based on the water absorption when used for an outer wall.

Further, when used as a discarded formwork, there is no need to provide an insulating layer on the concrete pouring surface, so that a surface that is directly in contact with concrete can be formed. No hassle.

[0013]

FIG. 1 is a partially cutaway perspective view of an ALC thin plate according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. This thin plate 10
Indicates a case where the thickness is 37 mm as an example,
The wire diameter of the main bar 12 is 1.6 mm, spaced at 25 mm intervals, and 12 steps are arranged in parallel with a step difference of 10 mm between every two wires.
The horizontal bars 13 perpendicular to the main bars 12 are bent at a wire diameter of 1.3 mm, are welded to the main bars 12, and are arranged at intervals of 50 mm.

FIG. 3 shows a thin plate having six steps, which are the same as the reinforcing bars in FIG. 1 except that the 48-hour value of the one-sided water absorption is 1.5%. In order to manufacture the thin plate 10 of FIG. 1, a total of 24 reinforcing bars having a wire diameter of 1.6 mm and a length of 1790 mm are arranged in parallel at 27 mm intervals. Then the wire diameter 1.6m
m, a transverse line 13 having a length of 587 mm
It is welded at 0 mm intervals to form a wire mesh reinforcing bar mat.
Then, the main bars 12 are pressed at one time so as to form 12 steps of 10 mm alternately every two lines, and the width of 56 mm is obtained.
Reinforcing bar 1 of 5 mm, length 1790 mm and thickness of about 12 mm
Make one.

Next, as shown in FIG. 4, support pins 14 are inserted through the center of the reinforcing bars 11 in the thickness direction at predetermined intervals in parallel with the horizontal bars 13, and the support pins 14 are inserted into a mold via bridges (not shown). Hang vertically. After setting the large number of reinforcing bars 11 in a mold at a desired pitch, a raw material slurry is injected. For example, this raw material slurry is mixed with 32 parts by weight of silica powder and 6 parts by weight of quicklime powder, and 32 parts by weight of Portland cement.
A slurry prepared by adding 0 parts by weight of water and kneading the same was added with 0.35 parts by weight of aluminum powder as a foaming agent and 0.9 parts by weight based on the solid content of the material as a water repellent. By increasing the rate of addition of this water repellent, the water absorption on one side can be lowered.

After the above-mentioned raw material slurry has been injected and solidified into a semi-plastic state after a predetermined time, it is taken out of the mold,
The surface of this semi-plastic living body is cut horizontally so as to have a height of 600 mm, and then cut at a pitch of 1820 mm in the length direction and then at a pitch of 37 mm in the thickness direction with a piano wire stretched vertically. Then, it is charged into an autoclave and steam-cured at high temperature and high pressure to complete the ALC sheet. The manufacturing method of the thin plate 10 of FIG. 3 is the same as that of the above-described example except that the press die is different. Note that the thickness and length of the panel, the wire diameter, the interval, and the like according to the required strength may be appropriately selected from the above ranges.

[0017]

As described in detail above, the A of the present invention
The LC thin plate has a thinner wire diameter of the reinforcing bar, a smaller interval between the reinforcing bars, and 6 to 12 steps, so that the bending strength is strong,
In addition, the workability is good, and almost uniform characteristics can be obtained everywhere on the panel.

Furthermore, when the 48-hour value of the water absorption of one surface of the panel is set to 5% or less, preferably 2% or less, water absorption and frost damage due to the water absorption can be prevented when used for the outer wall. In addition, when used as a discarded formwork, there is no need to provide an insulating layer on the concrete pouring surface, a surface that is directly in contact with concrete can be formed, and there is no trouble in removing concrete without splashing during casting.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an ALC thin plate of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of another embodiment.

FIG. 4 is a perspective view showing a state in which a reinforcing bar is attached to a support pin.

5 (a) is a plan view, FIG. 5 (b) is a cross-sectional view of FIG. 5 (a), and FIG. 5 (c) shows the state of attachment of the support pins of FIG. 5 (a). It is a side view.

FIG. 6 is a view showing another conventional reinforcing bar, (a) is a plan view,
(b) is a sectional view of (a).

FIG. 7 is a view showing another conventional reinforcing bar, (a) is a plan view,
(b) is a cross-sectional view of (a), and (c) is a side view showing an attached state of the support pin of (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ALC thin plate 2 Metal lath 3 Reinforcing bar 4 Main bar 5 Lateral bar 6 Reinforcing bar 7 Support pin 11 Reinforcing bar 12 Main bar 13 Horizontal bar 14 Support pin

Claims (2)

(57) [Claims] 1. An ALC thin plate having a thickness of less than 75 mm used for an outer wall of a building, a waste form, etc.
More than one main bar is arranged in parallel and alternately in steps on the same plane, and the horizontal bar is fixed to the main bar in contact with all the main bars in the width direction at right angles to the main bar. Reinforcing bars that are formed in steps and have a wire diameter of 1.0 to 3.0 mm, a spacing between main bars of 50 mm or less, and a spacing between horizontal bars of 75 mm or less are embedded near the center in the thickness direction. ALC sheet characterized by the following. 2. The ALC sheet according to claim 1, wherein the water absorption on one side is 5% or less.