JPH06330624A - Alc sheet - Google Patents

Abstract

PURPOSE:To provide an ALC sheet suitable for a permanent form to be used for the outer walls of a wooden building and a concrete building, that has a large strength and low water absorption, and whose end surfaces are subjected to grooving. CONSTITUTION:An ALC sheet is made to have a thickness of less than 75mm, preferably 50mm or less, and a bulk specific gravity of 0.55 to 0.65, and the percentage of one-surface water absorption of 5vol.% or less, preferably 2vol.% or less. On the end surface in the width direction thereof, a stepped part 1a or a groove 1b to 1d, or a groove and a projection 1e are provided along the entire length. As a reinforcement, a wire net 2 having a corrugated horizontal reinforcement 2a is embedded, and in accordance with the application these modes are combined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ALC plate suitable as an outer wall of a wooden building or a formwork of a concrete building.

[0002]

2. Description of the Related Art ALC panels are lightweight, have heat insulation, fire resistance, and
Since it has excellent sound absorption, it is widely used for exterior walls, partition walls, floors, etc. of buildings. This ALC panel is usually JI
It has a thickness of 75 mm or more as defined by SA5416, has a bulk specific gravity of 0.45 to 0.55, and has a surface absorption rate of 20 for 48 hours according to the ALC study group's water absorption coefficient (single surface absorption) test method. It is about% by volume. The compressive strength and bending strength of the standard panel having a thickness of 100 mm are about 40 kg / m ² and about 10 kg / cm, respectively.
It is about ² . To attach this ALC panel to a building, metal fittings are attached to a ruler angle fixed to a frame such as heavy steel frame or concrete. However, since this conventional ALC panel is heavy, it cannot be used for general wooden construction, so that a thin plate having a thickness of 50 mm or less has been used for wooden construction. However, the conventional thin plate has a bulk specific gravity of around 0.5 and a wire diameter of 1 m as reinforcing bar.
Bending strength is 10 because a metal lath of about m is embedded.
It was about 0 kg, and there was a problem that it was easily broken or broken during handling. Also, this thin plate is thin,
Since the strength is low, it is difficult to form the groove on the small edge surface, and there is also a problem that the joint portion is apt to be insufficiently waterproof when it is attached to the body. Recently, there has been a growing concern over the protection of wood resources and the disposal of industrial waste. As an alternative to the conventional wooden plywood formwork, AL is used as a discard formwork for concrete construction.
The C panel has come to the fore. However, when a conventional ALC panel with a thickness of 75 mm or more is used as a concrete formwork, it may adversely affect the hardening of concrete due to water absorption from the contact surface with the concrete, and when hardening the concrete. There is a problem that cracking occurs in the ALC panel due to shrinkage, and as a countermeasure against this, it is necessary to attach an insulating material to the inner surface of the formwork, and in addition there is a problem that it takes a lot of time to remove the droplets when concrete is poured. .

[0003]

SUMMARY OF THE INVENTION The present invention solves the above problems, has a high strength, a low water absorption rate, is grooved on the fore edge, and is suitable as an outer wall of a wooden construction or a waste formwork of a concrete construction. A thin plate is provided.

[0004]

The ALC sheet according to the present invention has a thickness of less than 75 mm, preferably 50 mm or less,
The bulk specific gravity is 0.55 to 0.65, and the water absorption on one side is 5
Volume% or less Desirably 2 volume% or less, or a step portion or groove portion or groove portion and a protrusion are provided over the entire length in the widthwise small face, and the horizontal bar bends in a wavy shape as a reinforcing bar. It is a buried wire mesh. Moreover, even if all of these aspects are not satisfied, the thickness may be less than 75 mm and a plurality of aspects may be combined as necessary. The one-sided water absorption rate is a 48-hour value according to the water absorption coefficient (one-sided water absorption) test method of the ALC Study Group.

[0005]

When the thickness is 75 mm or more or the bulk specific gravity is 0.54 or less, the above problems cannot be solved, and the bulk specific gravity of the ALC thin plate having a thickness of 75 mm or less, preferably 50 mm or less is 0.55.
.About.0.65, the compressive strength is 50 to 55 kg / cm when the conventional bulk specific gravity is 0.45 to 0.54.
² to 60 to 85 kg / cm ² . If the bulk specific gravity is further increased, the compressive strength can be increased, but it is not practical due to problems in manufacturing technology such as an increase in weight and a difficulty in cutting a semi-plastic material with a piano wire.

By setting the water absorption on one surface to 5% or less, preferably 2% or less, the water permeability can be lowered without impairing the air permeability, so that when it is used as an outer wall of a building, dew condensation and frost damage due to it can be prevented. When used as a formwork,
There is no adverse effect on the hardening of the concrete due to water absorption from the contact surface with the concrete, and therefore it is not necessary to attach an insulating material to the inner surface of the formwork, so that the surface directly contacting the concrete can be formed without trouble. Furthermore, since the droplets do not adhere to the concrete when it is poured, it is not necessary to remove it.

A structure such as a wall surface of a building is formed by providing a step portion or a groove portion or a groove portion and a protrusion on the edge surface, and a joint portion is formed when it is used as a formwork, a employment case, a real case, etc. It can be completely waterproof. Further, for example, the bending strength of an ALC thin plate having a thickness of 37 mm is such that the conventional thin plate has a metal lath with a wire diameter of about 1 mm embedded therein, and the breaking load is about 100 kg.
The thin plate of the present invention has a breaking load of 130 kg due to the embedding of a wire mesh in which the horizontal bars are bent in a corrugated manner as reinforcing bars.
The above can be done. Since the compressive strength and bending strength are improved in this way, it is less likely to be damaged during handling, the number of body edges of the skeleton is small when it is attached to a building, and when it is used as a formwork, it is a locking tool. It is possible to reduce the number of. As described above, by appropriately combining the bulk specific gravity, the water absorption on one surface, the shape of the forefront, and the structure of the reinforcing bar for reinforcing the ALC thin plate having a thickness of less than 75 mm, the ALC thin plate having the characteristics suitable for various applications is provided. be able to.

[0008]

EXAMPLE To manufacture this ALC panel, for example, a reinforcing bar of 2.3 mm was welded to the main bar and the horizontal bar, and the horizontal bar was bent into a wavy shape in the same manner as when manufacturing a normal ALC plate. After setting it in the mold with 32 parts by weight, silica powder 32 parts by weight and quicklime powder 6 parts by weight, Portland cement 32 parts by weight and 40 parts by weight of water and kneaded slurry, aluminum powder 0.35 as a foaming agent. By weight, a raw material slurry containing 0.9 parts by weight of the solid content of organopolysiloxane as a water repellent is injected. When the semi-plastic state is solidified after a lapse of a predetermined time, the semi-plastic body is taken out of the mold, the surface is cut horizontally with a cutting blade so that the height is 600 mm, and then it is cut vertically with a piano wire to a thickness of 37 mm. To do. After that, it is charged into an autoclave, steam-cured at high temperature and high pressure, and then the small face is cut into a desired shape with a rotary blade. Further, if the addition rate of the aluminum powder of the foaming agent is decreased, the bulk specific gravity increases and the strength also increases.
The water absorption on one side can be adjusted by adjusting the addition rate of the organopolysiloxane as the water repellent.

The shape of the fore edge surface of the ALC thin plate of the present invention and the situation of use will be described with reference to the drawings. 1A to 1D are partially cutaway side views showing the shape of the edge surface of the thin plate 1 of the present invention, and FIG. 1A shows a stepped portion 1a over the entire length of the edge surface on both sides in the width direction of the thin plate 1. It is provided, and the step portions 1a on both sides are provided.
Is symmetric. When this thin plate 1 is used, the stepped portion 1a of the joint portion is combined to form a combined structure.
(B) and (C) respectively show a groove portion 1b having a semicircular cross section and a groove 1c having a rectangular cross section at the center of the forefronts on both sides in the width direction, and both sides have the same structure. When this thin plate 1 is used, a strip material 4 having a circular cross section is fitted in the groove portion 1b of the joint portion, and a strip material or a plate seed 3 having a quadrangular cross section is fitted in the groove portion 1c. Employment structure. In the diagram (D), a groove 1d having a rectangular cross section is provided on one of the forefront surfaces, and a protrusion 1e that fits into the groove 1d is provided on the other of the forefront surfaces. When this thin plate 1 is used, the projection 1e is fitted into the groove 1d of the joint to form the actual structure. Further, as shown in FIG. 1A, a wire mesh 2 in which the horizontal bars 2a are bent in a wavy shape is embedded in these thin plates 1 as reinforcing bars.

FIG. 2 is a perspective view showing a state in which the thin plate of FIG. 1C is attached as a lateral wall of a wooden building. The thin plate 1 has a thickness of 37 mm, a width of 600 mm, a length of 1820 mm, and a bulk specific gravity of 0.60. The water absorption is 0.9%. Further, as a reinforcing bar, a wire mesh 2 having a horizontal bar bent in a wavy shape is embedded, and a groove 1c as shown in FIG. When this thin plate 1 is attached as a lateral wall of a wooden building, if the thin plate 1 is horizontally fixed with nails 11 to a wooden column 10 and a body column 12 which are vertically erected at desired intervals as shown in FIG. It is good, but at that time, the joint part of the thin plate 1 is formed in both groove parts 1.
It has a hiring structure in which the actual material 3 is inserted in c, and the chamfered portion 1f
Fill caulking material into. Further, since this thin plate has high strength, the number of the body columns 12 is usually four, but three. In this way, the joint can be completely waterproofed by employing the joint structure of the forehead as the actual structure. Furthermore, since the water absorption of the thin plate is low, it is possible to prevent dew condensation and frost damage caused thereby.

Next, the case where the above-mentioned thin plate is used as a mold on both sides of the outer wall of a concrete building will be described.
In FIG. 3, the wall 20 is made of normal reinforced concrete on the inside and has a thickness of 37 mm on both the outer and inner surfaces and a width of 600 mm.
mm, length 2100 mm, bulk specific gravity 0.55, water absorption on one side 0.9%, thin plates 21 and 22 in which wire nets with corrugated horizontal bars are embedded as reinforcement bars It is directly attached as a frame. In order to form the wall 20, the thin plates 21 and 22 are vertically erected at predetermined intervals with the longitudinal direction thereof vertically arranged to face each other, and the rod-shaped separator 6 is passed through the outer and inner thin plates 21 and 22. The thin plates 21 and 22 are respectively sandwiched by the washer 35 and the receiving washer 36 of the locking tool 30, and the pad 33 is screwed to the tip of the separator 6 via the jig 34 and the bolt 36 to form a form,
It suffices to cast concrete and remove the locking tool 30 after hardening.

At this time, since the thin plate has a low water absorption rate as described above, it does not adversely affect the hardening of the concrete due to the absorption of water from the contact surface with the concrete, and the thin plate also has a small thickness, so that the ALC is contracted during the hardening of the concrete. Since the panel is not cracked and there is no need to attach an insulating material to the inner surface of the mold, it is possible to form a surface that is in close contact with concrete without trouble. Furthermore, since the droplets do not adhere when pouring concrete, it is not necessary to remove it. Also, since it is strong, there is no risk of damage during handling,
The number of fittings required is small. Moreover, since it is not necessary to dismantle the formwork or repair the concrete surface, the construction period can be greatly shortened, and industrial waste can be reduced. It is convenient to use a thin plate with a step or groove on the edge so that concrete can be completely prevented from leaking.

[0013]

As described above in detail, the AL of the present invention
The C thin plate has a thickness of less than 75 mm, preferably 50 mm or less, and has a bulk specific gravity of 0.55 to 0.65, a one-sided water absorption rate of 5% or less, preferably 2% or less, or a stepped portion or The compressive strength and the bending strength can be improved by appropriately combining aspects such as providing a groove portion or burying a wire mesh in which the horizontal bars are bent in a wavy manner as reinforcing reinforcing bars as necessary. As a result, the following effects can be obtained when used as the outer wall of a building. That is,
Since it has high strength, it is less likely to be damaged during handling, and the number of studs can be reduced. Further, if a step portion, a groove portion, a protrusion or the like is provided on the fore edge surface, the joint portion can be formed into a structure such as a hiring staff, a real staff member, etc., so that it can be completely waterproof. Further, by lowering the water absorption rate, the water permeability can be lowered without impairing the air permeability, so that the dew condensation of the building and the frost damage due to it can be prevented.

When used as a mold, the following effects can be obtained. That is, since it has high strength, it is less likely to be damaged during handling, and the number of locking tools can be reduced. Also, by lowering the water absorption rate, it is possible to lower the water permeability without impairing breathability, so there is no adverse effect on the hardening of concrete due to water absorption from the contact surface with concrete, and the thickness is thin Does not cause cracks in the ALC panel. Therefore, it is not necessary to attach an insulating material to the inner surface of the form,
It can form a surface that is in direct contact with the concrete without any trouble. Moreover, since the droplets do not adhere when pouring concrete, the removal work is not required. Since it is not necessary to dismantle the formwork or repair the concrete surface in this way, the construction period can be greatly shortened, and industrial waste can be reduced. Further, by using a thin plate having steps, grooves, protrusions, etc. on the fore edge, it is possible to completely prevent leakage of concrete, which is advantageous in practical use.

[Brief description of drawings]

1A to 1D are side views of a thin plate of the present invention.

FIG. 2 is a perspective view showing an example in which the thin plate of the present invention is used as an outer wall of a wooden building.

FIG. 3 is a cross-sectional view showing an example in which the thin plate of the present invention is used as a formwork for a concrete building.

FIG. 4 is a vertical cross-sectional view illustrating a mounting state of the locking tool of FIG.

[Explanation of symbols]

 1 ALC thin plate 2 Reinforcing wire mesh 3 Real 4 Real 6 Separator 10 Pillar 11 Nail 12 Body pillar 20 Wall 30 Locking tool 35 Washer 36 Washer

Claims (4)

[Claims] 1. A thickness of less than 75 mm and a bulk specific gravity of 0.55.
ALC thin plate, characterized in that it is ˜0.65. 2. The water absorption on one surface is 5% when the thickness is less than 75 mm.
An ALC sheet characterized by being: 3. An ALC thin plate having a thickness of less than 75 mm and a step portion, a groove portion, or a groove portion and a protrusion are provided over the entire length in a small width surface in the width direction. 4. The ALC thin plate according to claim 1, 2 or 3, wherein a wire mesh having lateral corrugations bent in a wavy shape is embedded as reinforcing reinforcing bars.