JPH0423059B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is directed to an 80 mm thick welded wire mesh embedded therein.
This article relates to the following thin and long reinforced aerated concrete panels.

[Conventional technology]

Conventionally, thin lightweight aerated concrete panels have been reinforced using lath mesh or welded wire mesh (a wire mesh assembled by welding reinforcing bars called main reinforcements arranged in the length direction of the panel and reinforcing bars called sub-reinforcements arranged at right angles to the main reinforcements). ) is used. In addition, thin lightweight aerated concrete panels are easy to install on the framework of structures, etc.
This is generally done with nails or screws, and the diameter used in the bolting method for thick panels is
Unlike a 40-50mm washer, the head of a nail or screw is approximately 10mm in diameter, so reinforcement must be carried out finely over the entire surface of the panel to ensure reliable attachment to the panel's structure. Therefore, the smaller the reinforcement interval (the mesh interval of the lath mesh or the interval between the reinforcing bars of the welded wire mesh), the better, and it is preferable that the reinforcement interval is 200 mm or less. As described above, the finer the reinforcing spacing, the better the results, but in the case of welded wire mesh, the smaller the reinforcing bar spacing, the more welding points there are, which reduces the productivity of the wire mesh and increases costs. In addition, in order to ensure the rigidity of the welded wire mesh, the diameter of the reinforcing bars used cannot be made too small.
That is, since the diameter is limited to 2.0 mm, if the reinforcement intervals are made smaller, the amount of reinforcing bars used will increase, further increasing costs.

Although welded wire mesh has these drawbacks, it also has the advantage of being more rigid than lath mesh, so when manufacturing thin lightweight aerated concrete panels with panel lengths up to 50 times the panel thickness, the panel thickness A single piece of welded wire mesh was placed in the center of the wire in the form of a single piece.

In particular, when the panel length becomes even longer, even if two lath nets are used, it is not possible to ensure handling strength during panel transportation and construction. Two pieces of welded wire mesh were placed in a double layer above and below.

[Problem to be solved by the invention]

In conventional thin lightweight concrete panels with long panel lengths, two pieces of welded wire mesh of the same shape are double arranged, resulting in a considerable increase in cost. Furthermore, since two sheets of conventional wire mesh are used, there is also the drawback that the cutting workability when cutting the panel for use is poor.

The purpose of this invention is to provide a long, thin, lightweight aerated concrete panel that uses a welded wire mesh with a rougher structure than conventional welded wire mesh, and that can ensure handling strength during panel transportation and construction without degrading panel performance. It is to be.

[Means to solve the problem]

In this invention, two welded wire meshes, upper and lower, are embedded in a lightweight aerated concrete panel, and the positions of the main reinforcement and sub-reinforcement of the two welded wire meshes are
Only the extreme ends of the welded wire mesh are placed at the same position, and the rest of the welded wire mesh is placed alternately, and the main and secondary reinforcements of the two welded wire meshes are arranged so that the interval between them is 200 mm or less, and the panel thickness The reinforced lightweight aerated concrete panel is characterized by a length of 80 mm or less and a panel length of 60 times or more than the panel thickness.

Hereinafter, this invention will be explained in detail based on the drawings.

Figure 1 is a diagram showing one welded wire mesh A of the two welded wire meshes used in this invention, and FIG. 2 is a diagram showing the welded wire mesh B, which is the other of the two welded wire meshes. It is a diagram. In this way, each piece of welded wire mesh has a structure in which reinforcing bars called main bars arranged in the length direction of the panel and reinforcing bars called sub bars arranged at right angles to the main bars are welded together. The spacing between reinforcing bars at one location on the most end side is half the spacing between the reinforcing bars at the other locations in both sub-reinforcements and sub-reinforcements.

FIG. 3 shows a plan view of such a specific structure in which the welded wire mesh shown in FIG. 1 and the welded wire mesh shown in FIG. 2 are overlapped with a gap. As shown in FIG. 3, in the welded wire mesh shown in FIGS. 1 and 2, the main reinforcements 1 and sub-reinforcements 2 are arranged so that they are alternately intermediate in the plan view. .

Further, the main reinforcing bars and the sub reinforcing bars at the extreme ends are arranged at the same position because it is convenient when combining two welded wire meshes into a double shape.

As is clear from the comparison between Figure 3 and Figures 1 and 2, a piece of welded wire mesh is roughly welded, but in the state shown in Figure 3, the spacing between reinforcing bars is half the size. It looks like a single piece of tightly welded wire mesh.

In addition, the spacing between the main reinforcing bars and the sub-reinforcements of the welded wire mesh will be exemplified in the examples below, but the spacing between the main reinforcing bars and the spacing between the sub-reinforcements in one sheet of the welded wire mesh is 200 mm except for one place on the farthest side. Must exceed 400mm. Below 200mm, like conventional welded wire mesh,
There is a difficulty in manufacturing it, and if it exceeds 400 mm, it becomes impossible to satisfy the handling strength during construction even if wire mesh is arranged as in this invention.

Moreover, the predetermined objective can be achieved even if the intervals between the sub-reinforcements are made coarser than the intervals between the main reinforcements, as shown in the embodiments described later.

Next, FIG. 4 is a sectional view at the end of the welded wire mesh of the lightweight cellular concrete panel of the present invention manufactured by embedding these two welded wire meshes. That is,
In FIG. 4, the main reinforcements 1 of the two upper and lower welded wire meshes are both visible. In FIG. 4, the sub-reinforcements 2 in the upper and lower wire meshes are seen from a state in which they are arranged alternately at intermediate positions. Also,
Although not shown in the figure, the main reinforcing bars in the two upper and lower wire meshes are arranged alternately at intermediate positions, so in the cross-sectional view of the center of the panel, only the main reinforcing bars in either the upper or the lower part can be seen.

As can be seen from this explanation, the positions of the main reinforcements 1 and 2 of the welded wire mesh A placed at the top and the welded wire mesh B placed at the bottom are one welded wire mesh in the thickness direction of the panel. Although they are arranged offset from each other, unlike in the case where the panels are reinforced with nails or screws, this does not pose any problem when used as reinforcement for attaching the panel to the frame using nails or screws. As a result, by using two pieces of welded wire mesh with a reinforcing bar spacing of more than 200 mm and less than 400 mm, it was possible to achieve the same reinforcement as welded wire mesh with a reinforcing bar spacing of 200 mm or less. Even if the panel is long, it will not be damaged even if the panel is held at both ends in the length direction during transportation, and handling strength during construction can be ensured.

Furthermore, since this welded wire mesh has approximately half the amount of reinforcing bars used and the number of welded reinforcing bars as a single sheet, the spacing between the reinforcing bars is 1/1/2.
Two welded wire meshes can be produced at the cost of one of the two, making it very economical.

In addition, reinforcement using two pieces of welded wire mesh has superior effects compared to other reinforcement methods, such as lower manufacturing costs and long panels that can ensure handling strength during transportation and construction. This effect can be achieved especially with thin and long lightweight aerated concrete panels. Such a panel is
It is a thin and long lightweight aerated concrete panel with a thickness of 80 mm or less and a panel length of at least 60 times the panel thickness. For panels outside this range, the difference between the effects of the present invention and the conventional reinforcing method is not significant.

〔Example〕

Example 1 and Comparative Example 1 Using mesh reinforcing bars shown in Figures 1 and 2, that is, iron wires with a diameter of 3.2 mm for both main and sub-reinforcements, the initial main-reinforcement spacing was
80mm, the next three are 160mm apart, making a total of 5 mesh reinforcing bars, and the sub-rebar spacing is 141mm for the first one and 282mm for the rest.Weld these two mesh reinforcing bars so that the main reinforcement and sub-reinforcement are alternate. When stacked together, it becomes a double mesh reinforcing bar (Figure 3).Using this reinforcing mesh reinforcing bar, a lightweight aerated concrete panel with a specific gravity of 0.5, 50 mm thick and 3000 mm long, was manufactured using high pressure steam curing. The performance was measured and the following values were obtained.

Panel cracking strength: 34Kg・m Panel nail retention strength: 152Kg/pcs This value is more than 1.6 times the bending strength of 20.5Kg・m, which is required to prevent the panel from breaking under its own weight when held horizontally, and is sufficient for handling. There is. For comparison, the one reinforced with flat lath No. 3 specified in JIS A 5505 had a bending strength of 15 kg・m, but it broke during special raising and could not be used as a product. Also, the holding power of the nails is equivalent to that of lath net reinforcement.

Example 2 Using reinforcing bars with a diameter of 3.2 mm for both the main and sub-reinforcements, the spacing between the main bars is 110 mm for the first one and 220 mm for the next two.
4 in mm, sub-rear spacing is 185mm for the first and 370mm for the rest
One side is welded wire mesh, and the other side has 4 main bars at the same spacing, the last one is 185mm, and the rest are 370mm. A welded wire mesh was used, and these two sheets were combined with the main reinforcing bars on the outside.
These two welded wire meshes are used for reinforcement, and the thickness is 50 mm.
We manufactured lightweight aerated concrete panels with a specific gravity of 5.0 that were 3000mm long and were cured with high-pressure steam, and measured their performance and obtained the following values.

Panel cracking strength: 37Kg・m Panel nail retention strength: 171Kg/piece Similar to Example 1, this also has excellent handling safety factor and nail retention strength.

〔Effect of the invention〕

This invention has the above-described configuration, so even if two welded wire meshes are used, the cost and weight are almost the same as the conventional one welded wire mesh, and there is no inferiority in cutting workability. It also has the same panel mounting ability as a conventional thin-walled short panel with the same nail retention force.

And the panel of this invention has a thickness like this
While retaining the features of conventional thin lightweight aerated concrete panels of 80mm or less, when the panel length is 60 times or more the panel thickness or longer,
This has the excellent effect of ensuring reliable handling strength so that the panel will not break during transportation.

[Brief explanation of drawings]

Figure 1 is a plan view of the welded wire mesh placed on the upper side of the panel in the thickness direction, Figure 2 is a plan view of the welded wire mesh placed on the lower side of the panel in the thickness direction, and Figure 3 is the same as Figure 1. FIG. 4 is a plan view of the welded wire mesh shown in FIG. FIG. 3 is a cross-sectional view of the concrete panel at the end of the welded wire mesh. A... One welded wire mesh, B... The other welded wire mesh, 1... Main reinforcement, 2... Sub-reinforcement.

Claims (1)

[Claims] 1 Two welded wire meshes (upper and lower) are buried in a lightweight aerated concrete panel, and the positions of the main and secondary reinforcements of the two welded wire meshes are arranged at the same position only at the extreme ends of the welded wire meshes when viewed from a plane. Except for the very edge,
They are arranged alternately, and the interval between the main and sub-reinforcements of the two welded wire meshes is 200 mm or less, and the panel thickness is 80 mm or less and is at least 60 times the panel length. Reinforced lightweight aerated concrete panels.