JPH0543022B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a floorboard that constitutes a raised floor in a room equipped with various equipment such as office automation equipment and computers. The object of the present invention is to provide a product that is manufactured to be durable and can sufficiently withstand high floor loads.

<Prior Art> Free access floorboards are made of aluminum or aluminum alloy, steel, inorganic material such as concrete, synthetic resin, wood, etc. These are formed into a rectangular shape and are laid directly on the floor or supported at a predetermined height by support legs.

This is the so-called raised floor, and above it are computers and their peripheral equipment.
Heavy items such as other OA equipment are often installed. In addition, it is desirable that the temperature of a room equipped with such a raised floor be maintained at a predetermined temperature for equipment management purposes, and that the noise of workers walking and the noise generated from the equipment be suppressed as much as possible.

<Problems to be solved by the invention> Among conventional free access floorboards, those made of aluminum die-cast steel plates produce harsh metallic sounds when objects fall or when walking. Because the space between the front and back panels is hollow to reduce weight, sound reverberates in the hollow space. Therefore, in both cases, synthetic resin tiles or carpets are attached to the top of the surface board in hopes of providing a certain degree of sound insulation and heat insulation, but these have not been effective solutions, and they have not been able to achieve a certain level of deflection strength. In order to obtain this, there were difficulties such as having to use a considerably large weight per unit area.

Inorganic panels such as concrete-based panels have excellent fire resistance and are inexpensive, but they are generally weak against impact, so they are not suitable for large floorboards. Moreover, it is undesirable because it is heavy and difficult to construct and layout, and it is also a heavy object for buildings. Furthermore, there is a drawback that dust and chips occur.

Furthermore, although synthetic resin and wooden ones have the advantage of being cheap and light, they have poor fire resistance and can easily burn. In addition, because of its low strength, it has the disadvantage that it is limited to use as a floorboard or on small floorboards.

Some attempts have been made to fill the inside of free access floorboards with foamed concrete, but pouring the concrete is not easy and there are problems with the workability. Specifically, when foaming concrete within the floorboards, it is difficult to control the foaming ratio; if the foaming ratio is low, unfilled areas will be created, and if the foaming ratio is high, blisters will occur in the floorboards. When injecting foamed material into floorboards, the bubbles may expand abnormally due to the reaction heat during injection, making the amount of air unstable, making it difficult to control the amount of injection, and requiring considerable skill. . Moreover, while the cocrete hardens, air bubbles rise to the surface, making it impossible to obtain a uniform foamed product, resulting in variations in strength.

Therefore, attempts have been made to fill the interior with CFRC (garbon fiber reinforced cement) or GRC (glass fiber reinforced cement), but these have the problems of large shrinkage strain, large weight, and high cost.

<Means for Solving the Problems> Therefore, the present invention takes advantage of the advantages of metal floorboards, which have excellent rigidity and flexibility in processing, while improving filling performance and quality, as well as reducing the weight of the product. We studied the idea of creating a floorboard with excellent heat and sound insulation properties, and here we have completed the process. Its features are a metal front plate 1 and a metal back plate 2.
The structure has a molded body 4 made of inorganic hollow particles 3 as an aggregate inside a floor plate consisting of.

The inorganic hollow particles 3 referred to herein refer to particles that are hollow inside or particles that have a large number of closed cells inside the particles. In particular, "shirasu balloons" obtained by firing volcanic glass shirasu are suitable, and in addition, those obtained by processing porous inorganic particles such as perlite and sepiolite, ceramic inorganic hollow particles, such as diatomaceous earth, etc. A ceramic porous body obtained by mixing a swelling resin with a ceramic raw material using bentonite, adding a lubricant to form a gel, drying and firing it (Japanese Patent Application Laid-open No. 60-46978), and further Particles with a porous fruit in the center and a dense shell on the outer periphery (Japanese Patent Application Laid-Open No. 61-20646)
etc. can be used.

The inorganic hollow particles 3 are mixed with various inorganic and organic binders, injected into the floorboard in a fluid state, and then solidified to form a molded body 4, or formed into a molded body 4 in advance and then covered with a metal front plate and a back plate. Product.

<Function> With such a structure, the molded body 4 made of inorganic hollow particles 3 as aggregate inside the floorboard functions as heat insulation, sound insulation, and fire resistance, and the metal surface plate 1
and the metal back plate 2 serve to reinforce the entire floorboard. As a result, a predetermined strength can be ensured without increasing the thickness of the metal front plate 1 and the metal back plate 2, and the overall weight can be relatively reduced. In addition, since the inorganic hollow particles 3 are used as the aggregate during injection, the fluidity is good, and it is possible to easily and uniformly fill the gap between the metal front plate 1 and the metal back plate 2 without creating an unfilled area. This effect can be obtained.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a partially cutaway bottom view of the free access floor plate according to the first embodiment of the present invention, and FIG.
- It is an enlarged sectional view of part A.

In this embodiment, both the front plate 1 and the back plate 2 are made of steel plates. After the outer walls 8 of the four edges and the internal ribs are press-formed, the metal back plate 2 is integrated with the rectangular flat metal front plate 1 by spot welding. A filler whose aggregate is inorganic hollow particles 3 is injected into the internal space formed by the face plate 2 through an injection hole (not shown). A tile 20 is pasted on the upper surface of the metal surface plate 1. In this example, the inorganic hollow particles 3 filled in the hollow part 7 between the metal front plate 1 and the steel back plate 2 are Shirasu balloons (manufactured by Aso Cement Co., Ltd., commercially available) with a particle size of 0.6 to 0.21 mm. As an example, use Scarlite (brand name Scarlite No. 2), which is mixed with cement so that the volume ratio is approximately 3 to 5 parts of whitebait to 1 part of cement, and then mixed with approximately 50% by weight of water and thoroughly kneaded in a mixer. It was cast and molded. Because it has very good fluidity, it can be cast in this way.

The cement mortar filler made of inorganic hollow particles formed between the metal front plate 1 and the back plate 2 has an absolute dry specific gravity of 0.6 to 0.9 (aluminum 2.7) and a thermal conductivity of the molded body of 0.10 to 0.40 kcal. /m・hr・℃(aluminum
190.8 kcal/m・hr・℃), and has approximately twice the strength in both bending and compression compared to aerated concrete with the same specific gravity.

3 and 4 show a second embodiment of the present invention, FIG. 3 is a partially cutaway bottom view, and FIG.
It is an enlarged cross-sectional view taken along line BB in the figure. In this example, the aluminum front plate 1 and the steel plate back plate 2 are press-fastened by fastening means at a predetermined interval. Aluminum surface plate 1
The ribs provided on the entire lower surface of the conventional model have been removed from the inside to reduce weight, leaving the outer periphery intact, and the material is thinner, but the processing is carried out with the same precision as before. The back plate 2 made of a steel plate is obtained by pressing a surface-treated high-tensile steel plate. The aluminum surface plate 1 has an outer wall 8 whose four edges reach the bottom surface, and an inner circumferential rib 9 is provided inside parallel to the outer wall 8, and a fitting recess 10 is formed between them, and a fitting recess 10 is formed on the back surface of the aluminum surface plate 1. A large number of support poles 12 are provided. The lower end of the support pole 12 has a small diameter portion smaller than the diameter of the support pole 12. The steel back plate 2 to which the aluminum front plate 1 is combined is provided with a hook-shaped outer peripheral flange portion 5 wider than the inner dimension of the fitting recess 10 of the aluminum front plate 1. A fastening hole 6 in the small diameter part is further provided in order to press fit into the small diameter part at the tip of the support pole 12 at a position corresponding to the support pole 12.

Such an aluminum front plate 1 and a steel plate back plate 2
This means that after forming a molded body 4 of inorganic hollow particles 3 in the aluminum front plate 1, the outer peripheral flange portion 5 of the steel back plate 2 is inserted into the fitting recess 10 provided at the lower end of the aluminum front plate 1. Press fit, and then add the steel back plate 2.
The supporting poles 12 are integrated by fastening means such as press-fitting the tip of the support pole 12 into a fastening hole 6 provided in the support pole 12.
The inorganic hollow particles 3 filled in this free access floorboard are the shirasu balloons used in the previous example, to which cement has been added in the same manner. Note that adding a few percent by weight of glass fiber increases the weight, but further increases the strength. In this embodiment, the molding is performed in advance, but an injection method may be used as in the first embodiment.

FIG. 5 is a longitudinal sectional view of a free access floorboard according to a third embodiment of the present invention. In this free access floor board, surface-treated steel plates such as galvanized steel plates are used for both the front plate 1 and the back plate 2. This metal back plate 2 has vertical walls 1 on all sides by press molding.
8, the upper part of which is a horizontally recessed fastening flange part 15, and the grounding bottom part 16, which is the bottom surface of the floor panel, is provided with a supporting wall 14 that protrudes toward the upper surface side.
is formed. The metal surface plate 1 has fastening holes 17
is located at a position corresponding to the plurality of support walls 14 of the back plate 2, and its edge protrudes downward and bends to press the upper part of the support wall 14 of the truss structure. The four edges of the front plate 1 are bent downward and the fastening flange 15 of the back plate 2 is press-fastened over almost the entire circumference. The back surface contacts the upper edge of the back plate 2. For details on this, see
No. 116644, it is easy to create a sealed structure and there is no welding burn, so you can use surface-treated steel sheets to create beautiful products with good durability.

The inorganic hollow particles 3 existing between the metal front plate 1 and the metal back plate 2 are fine particle shirasu balloons (manufactured by Sanki Kogyo Co., Ltd.) in which 50% of the inorganic hollow particles 3 have a particle diameter of 150 μm or less.
manufactured by the company, product brand BO ₃ ), to which cement is added so that the volume ratio is 3 to 5 parts of Shirasu balloons to 1 part of cement, and further 3 to 20% by weight of carbon fiber is added to form a metal back plate. The molded product 4 was poured into the concave portion of No. 2 and left overnight at room temperature to form a solidified molded product 4.

The metal front plate 1 is integrated onto the upper part of the metal back plate 2 in which the inorganic hollow particles 3 are filled and solidified together with cement and carbon fibers, and this is done by the pressure fastening described above.

Although the free access floorboard of the present invention described so far has been rectangular, the present invention is not limited to these embodiments, and may be applied to triangular or other shapes other than rectangular. I can do it. In addition, for example, FIG. 6 shows a partially cutaway plan view of the fourth embodiment, and FIG. 7 shows an enlarged sectional view of the C-C section. By providing a directional helix, the dividing groove 19
For example, the floorboard itself can be curved to conform to unevenness (for example, as described in Japanese Patent Publication No. 4-
No. 35586), tiles 20 or a carpet may be bonded to the surface of the metal surface plate 1 in a conventional manner.

Examples of embodiments of the inorganic hollow particles constituting the free access floorboard of the present invention include mixing them into cement, and injecting and filling them before solidification.
Although we have described an example in which the back plate is filled and solidified into one of the front and back plates, it can also be packed between the metal front plate 1 and the back plate 2 after being molded and solidified into a predetermined shape. An example of this is shown in FIG. 8 (vertical cross-sectional view of the end of the floorboard). In this example, the side wall of the bowl-shaped metal front plate 1 has an outer protrusion 21 for engaging with the metal back plate 2, and the metal back plate 2 has an inner surface on the bowl-shaped outer wall. It has a structure in which a protrusion 22 is provided to engage and integrate. In the internal hollow part 7 formed by the metal front plate 1 and the metal back plate 2, when these are assembled, the same shirasu balloon inorganic hollow particles 3 as in the above embodiment are used together with carbon fibers using cement. The molded body 4 that has been molded and solidified is internally bonded.

So far, cement has been exemplified as a medium for forming the inorganic hollow particles 3 into a molded body, but synthetic resins such as phenol resin, gypsum, water glass, etc. can also be used.

Although the above are examples of the present invention, the present invention is not limited to these examples, and any of the metal front plate 1, the metal back plate 2, and the inorganic hollow particles 3 meet the purpose of the present invention. The structure described above can be arbitrarily changed according to the specifications required for achievement, and the selection thereof is also free.

<Effects of the Invention> The free access floorboard of the present invention detailed above has the following features:
It is easy to inject a filler made of inorganic hollow particles as aggregate during manufacturing, and the filling quality and performance are good, with little shrinkage distortion. It is lightweight, has excellent heat and sound insulation properties, and has high strength and can withstand high loads. In addition, the molded product with cement has a fire-resistant structure, making it an excellent flooring material for raised floors in rooms equipped with office automation equipment, computers, etc.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway bottom view of the free access floor plate according to the first embodiment of the present invention, and FIG.
- It is an enlarged sectional view of part A. 3 and 4 show a second embodiment of the present invention, in which FIG. 3 is a partially cutaway bottom view, and FIG. 4 is an enlarged cross-sectional view taken along line BB in FIG. FIG. 5 is a longitudinal sectional view of a free access floorboard according to a third embodiment of the present invention. FIG. 6 is a partially cutaway plan view of the fourth embodiment, and FIG. 7 is an enlarged sectional view taken along the line CC in FIG. FIG. 8 is a vertical sectional view of the end portion of the free access floorboard of the fifth embodiment. 1...Metal front plate, 2...Metal back plate, 3
... Inorganic hollow particles, 4 ... Molded body, 7 ... Hollow part, 10 ... Fitting recess, 15 ... Fastening flange part, 19 ... Division groove, 20 ... Tile, 21 ...
External protrusion, 22... Inner protrusion.

Claims (1)

[Claims] 1. A free access floorboard characterized by having a molded body 4 made of inorganic hollow particles 3 as aggregate inside a floorboard consisting of a metal front plate 1 and a metal back plate 2.