JPS637619Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a thin ALC board used for covering roofs, exterior walls, steel structures, etc.

ALC boards are widely used because they are lightweight and have excellent heat insulation and fire resistance. However, on the other hand, it is somewhat weak in strength and easily cracks.
It is necessary to embed reinforcement material inside the ALC board.

So-called thin wall with conventional thickness of about 20 to 50 mm
ALC plates are made by having a flat metal lath 1 buried in the center of the plate thickness as a reinforcing material, as shown in Figure 1, or with a wire diameter of 1.6~
A lattice reinforcement material 2 made of 3.2mm iron wire arranged in a lattice pattern at intervals of about 100mm is buried in the center of the plate thickness. It has its drawbacks.

Thin-walled ALC plates must have uniform bending strength on the front and back sides of the plate during handling, so the embedding of flat metal lath and lattice reinforcement is limited to the center of the plate thickness.
There was almost no reinforcing effect against bending stress in the longitudinal direction of the plate, and the bending strength was insufficient. As a result, bends and cracks may occur during shipping and handling and transportation.
There are many inconvenient aspects, such as bending and cracking during product handling during construction, and easy bending and cracking after construction. Therefore, the thickness of a thin ALC plate is limited to about 2m using the conventional reinforcement method mentioned above.
Also, the span of the base to which the thin ALC board is attached is 600.
It is limited to about mm.

Recently, in order to improve the bending strength of thin-walled ALC plates, as shown in Fig. 3, the horizontal reinforcements 3 are made into bent chevron shapes, and the vertical reinforcements 4 are welded to the bent portions to be used as a three-dimensional lattice-like reinforcing material 5. However, similar to those using the planar reinforcing material 2, there is a problem in impact resistance. Since the size of the lattice of the reinforcing material made of iron wires is about 100 mm, the unreinforced area becomes large and holes reaching the back surface are likely to occur during impact, and the ALC base material and the reinforcing material may separate. Impact resistance is poor, such as easy to occur. In addition, since the unreinforced portion is large, when attaching a thin ALC panel using nails or screws, the panel is likely to crack or chip, and furthermore, the holding force after nailing or screwing is insufficient.

A thin-walled ALC panel with embedded flat metal lath has improved impact resistance because the entire panel is uniformly reinforced compared to one with embedded lattice-like reinforcing material, but the ALC base material does not peel off or fall off. Cracks occur easily. Also, flat metal laths are prone to bending and are difficult to set in place during manufacturing due to their own warping.

This idea solves all the problems of the thin-walled ALC panels mentioned above at once, and its purpose is to provide a thin-walled ALC board with excellent bending strength, impact resistance, etc.

The thin-walled ALC plate according to this invention will be explained below with reference to the embodiments shown in FIGS. 4 and 5.

This ALC board is made of reinforcing material A with multiple reinforcing bars 7 fixed to the protruding corners along the bending position of the corrugated metal lath 6 bent into the shape of an accordion body. The reinforcing bars 7 are oriented in the longitudinal direction of the ALC plate.
A plurality of parallel reinforcing bars 7 are alternately arranged near the surface layer or back layer of the ALC board.

The thickness of ALC plate B is 20 to 50 mm. 20
If the thickness is less than 5 mm, the strength and fire resistance are insufficient and it is not practical, and if it exceeds 50 mm, the ALC board is in a different field from the thin ALC board of this invention, and reinforcement with the reinforcing material of this invention is not suitable. Metal lath mesh dimensions (maximum inner diameter or maximum diagonal length of the mesh)
is preferably 10 to 50 mm. At the end of 10mm, the adhesion between the ALC base material and the metal lath decreases, and the impact
ALC base material becomes easy to peel off. If it is 50mm or more, there is a risk of a hole partially reaching the back side due to impact. The thickness of the reinforcing bars is preferably 1.6 to 3.2 mm. 1.6
If it is less than mm, the reinforcing effect is insufficient, and it is easy to bend when buried in the ALC board, resulting in unstable shape and buried position, which is undesirable as it requires a lot of effort in manufacturing control. Thin walls of 3.2 mm or more are usually 20 to 50 mm.
This is not necessary for reinforcing the ALC board, and on the contrary, it is undesirable because it takes time and effort in terms of cutting, etc. The height and pitch of the corrugated bends of the corrugated metal lath are not limited, but
Needless to say, there is a limit to the thickness of the ALC board since the height of the waves buries the metal lath.

This idea has the above structure, and a reinforcing material made up of corrugated metal lath and reinforcing bars is embedded in the thin ALC board, and the reinforcing bars are placed near the surface or back layer. Therefore, this ALC board is uniformly reinforced as a whole with metal lath, and has high impact resistance, and also has high bending strength due to the reinforcing bars on both the front and back layers.

For example, a thin ALC board with a width of 600 mm and a thickness of 50 mm has flat metal lath (equivalent to flat lath No. 3) or lattice reinforcement material (iron wires of 3.2 mm diameter welded at 10 mm intervals in a lattice shape) embedded in each. , bending moment when cracking occurs: 25Kg・m, bending moment when breaking: 40
It was Kg・m. In contrast, the width of the present invention is 600 mm,
Reinforcement material made by bending a 50mm thick ALC plate (equivalent to flat lath No. 3) with a wave height of 30mm and a pitch of 50mm, and welding a total of 10 reinforcing bars with a diameter of 2.6mm to the bent corner side. ) has a bending moment of 40Kg・m when a crack occurs, and a bending moment of 60Kg・m when it breaks.
It was m.

As described above, this ALC board has high bending strength, so considering the occurrence of deflection and cracking due to handling during construction or transportation, it is difficult to
ALC boards had a maximum length of about 2m, but the panel of this invention can be made up to 3.3m long.
If the board length is 3m or more, when used as an exterior wall,
It is now possible to increase the floor height of a building using a single board, streamlining construction, saving labor, and improving the appearance and design of the building.
Improved water-stopping properties can be achieved. Also, metal lath
Because it covers the entire area and thickness of the ALC board,
Good adhesion to ALC base material, excellent impact resistance, nails,
There is no cracking or chipping when driving screws, and it has excellent nail and screw holding power. Furthermore, the metal lath, which is bent into a corrugated shape with reinforcing bars fixed to it, has high rigidity and good shape retention, so when it is buried to manufacture ALC plates, it does not bend or warp like flat metal lath. ALC boards can be manufactured by embedding reinforcing materials easily and accurately.

[Brief explanation of the drawing]

a and b in Fig. 1, Fig. 2, and Fig. 3 are respectively,
A plan view and a cross-sectional view showing the reinforcing condition of a conventional ALC board in which flat metal laths, lattice-like reinforcing materials, and three-dimensional lattice-like reinforcing materials are embedded. FIG. 2 is a partially cutaway perspective view and a longitudinal cross-sectional view. 1...Flat metal lath, 2...Lattice reinforcement material, 3
...Horizontal reinforcement, 4 ... Vertical reinforcement, 5 ... Three-dimensional lattice reinforcement, 6 ... Corrugated metal lath, 7 ... Reinforcing bar, A ...
Reinforcement material, B...ALC board.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) ALC with a thickness of 20 to 50 mm is made by fixing reinforcing bars along the corrugated bending position of the corrugated metal lath.
1. A thin-walled ALC board, characterized in that the reinforcement is embedded in the board and the reinforcing bars are placed near the surface or back layer of the ALC board. (2) The thin-walled ALC board according to claim 1, wherein the reinforcing bars have a wire diameter of 1.6 mm to 3.2 mm. (3) The corrugated metal lath has a mesh size of 10 to 50 mm and is thin as described in item 1 of the utility model registration claim.
ALC board.