JP3649500B2 - Free access floor boards - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a free access floor board (hereinafter abbreviated as a floor board) that is arranged on the basic floor surface and constructs a free access floor that enables under-floor wiring of various electronic devices such as computers. It relates to the improvement of the floor board that can follow the uneven surface.
[0002]
[Prior art]
A free access floor that secures space for under-floor wiring of various electronic devices in offices that have been converted to office automation is constructed by arranging a large number of floor boards of a predetermined shape on the basic floor surface. This floor plate is, for example, a configuration in which a back surface plate (called a bottom plate) having a concavo-convex reinforcing structure in which a large number of convex diaphragm portions are formed on a substantially square surface plate (called a top plate) is integrated at a peripheral portion, It is laid on the foundation floor via support legs, and a wiring space is formed between the foundation floor and the floorboard. In general, the front plate and the back plate are each a metal plate, for example, a surface decorative steel plate (galvanized steel plate or the like), and a carpet or a resin sheet or the like is attached as a finishing material on the upper surface of the front plate.
[0003]
Such a floorboard is required to have a high level of plane accuracy because if there are variations in the heights of the four corners, the floorboard will rattle after laying. However, since the flatness of the foundation floor is not always good and unevenness is present, rattling occurs even if the flatness of the floorboard is high, and it takes a lot of time to adjust the rattling when laying. Was. In order to solve this problem, the present inventor, in Japanese Patent Publication No. 4-35586, fractionates one of the front plate or the back plate with a diagonal line and conforms to the unevenness by deforming with the separation opening as a boundary. Proposed floorboard that can be used. As a result, it became possible to construct a free access floor that conforms to the unevenness, although it is a substantially square floor board that is the same as before.
[0004]
[Problems to be solved by the invention]
The above Japanese Patent Publication No. 4-35586 is designed to arrange a three-point supported triangular shape divided by diagonal lines on the front or back plate on the foundation floor surface to form a floor plate that conforms to unevenness, and as a single triangle This eliminates the inconvenience of handling seen in the shaped floor board and suppresses an increase in cost per unit area. However, since the front plate or the back plate made of a single metal plate is fractionated, there arises a problem that the structural strength of the fraction opening is lowered.
[0005]
Explaining the above problem in Japanese Examined Patent Publication No. 4-35586 mentioned above, in the structure in which the surface plate is divided by a diagonal line, the opposite end portions are respectively extended and bent downward to form a diagonal rib. Since the image opening is composed only of simple diagonal ribs, the section modulus is low and the structural strength is not so strong.
[0006]
In order to improve the structural strength, a means of increasing the section modulus by further extending from the end of each diagonal rib and bending it to form a horizontal support surface can be considered. However, since the width of the fraction opening is at least so small that the heel of the high heel does not fall, that is, 8 mm or less, the support surfaces cannot be formed in a direction in which they face each other. Then, it is bent downward and formed into a U-shaped cross section. However, the two-stage bending in the same direction has two steps and is not practical. Therefore, it was decided to investigate a structure that reliably improves the strength of the floor plate at the fractional opening without reducing the manufacturing cost and while reducing the manufacturing cost.
[0007]
[Means for Solving the Problems]
What has been developed as a result of the examination based on the above background is that the front plate and the back plate are integrally joined at the periphery, and the front plate is divided by a diagonal line, with a fractional opening formed as a boundary. In the free access floor plate that can deform due to its own weight and can follow the unevenness, this fractional opening is bent downward on one of the opposite ends across the diagonal to form a simple diagonal rib, and the other of the ends Is bent downward and further horizontally to form a composite diagonal rib having a horizontal support surface, and the other end of the simple diagonal rib is substantially in contact with the horizontal support surface. It is a floor plate whose surface is in a substantially abutting state with the back plate.
[0008]
Since the conventional fraction opening has only diagonal ribs corresponding to the simple diagonal rib in the present invention, the section modulus is not high, and each diagonal rib individually supported a load near the fraction opening, The structural strength was low. In the present invention, for the composite diagonal rib, the section modulus is increased by forming a horizontal support surface, and for the simple diagonal rib, the end portion is substantially in contact with the horizontal support surface, so that the side of the simple diagonal rib is on the side of the simple diagonal rib. The composite diagonal rib and the simple diagonal rib can counteract the applied load jointly, and as a result, the structural strength of the entire fraction opening is improved.
[0009]
Since the composite diagonal rib is formed by bending a sectioned surface plate into a crank-like cross section, it can usually be formed by a single bending process. In addition, since the composite diagonal rib having a plurality of bent portions is formed only at one end portion sandwiching the diagonal line, compared to the case of forming a diagonal rib having a U-shaped cross section at both ends sandwiching the diagonal line, There is an advantage that can be reduced. As described above, the fractional opening of the present invention does not require manufacturing cost and labor, and has a feature that the structural strength can be improved with an extremely simple structure.
[0010]
The substantially abutting state between the horizontal support surface and the end of the simple diagonal rib and the substantially abutting state between the horizontal support surface and the back plate are formed by bending the horizontal support surface to be substantially horizontal, preferably slightly upward. Realize with. The reason why the horizontal support surface is formed slightly upward is to prevent the floor plate from being deformed at the fractional opening by forming an appropriate gap with the back plate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the floor board of the present invention will be described with reference to embodiments. FIG. 1 is a plan view of the floor board 1 of the present invention, and FIG. 2 is a rear view thereof. As shown in FIGS. 1 and 2, the floor board 1 is formed by bending the peripheral edge of the front surface plate 2 at the peripheral portion and covering the peripheral edge of the rear surface plate 3, and partially caulking the front surface plate 2 and the rear surface plate 3 integrally. The steel plate floor plate is provided with a sandwiched portion 4 to join the front surface plate 2 and the back surface plate 3 and filled with the core material 5 (see FIG. 3). An opening 6 is formed and a sealing material 7 is injected. The corner portion is provided with a notch 8 for drawing out a communication line or the like under the floor. Further, the back plate 3 is provided with a number of reinforcing convex diaphragm portions 9 and the apexes of the convex diaphragm portions 9 are brought into contact with the surface plate 2 from the inside, and the surface plate 2 and the convex diaphragm are brought into contact with the contact portions. By providing the sandwiching portion 10 that is caulked together with the portion 9, the integrity of the front plate 2 and the back plate 3 is made stronger and the structural strength of the floor plate 1 is improved.
[0012]
3 or 4 is a cross-sectional view taken along the line AA in FIG. 1. FIG. 3 shows a case where a load F is applied to the side of the composite diagonal rib 12 with the horizontal support surface 11 extended, and FIG. This represents a case where a load F is hung on the side of the simple diagonal rib 13 with the end abutted against the surface. As shown in FIG. 3 or FIG. 4, the fractional opening 6 provided in the floor board 1 of this example fractionates the surface board 2 with a diagonal line and extends one of the opposite end parts downward and horizontally. The composite diagonal rib 12 is formed by bending in this order to form a horizontal support surface 11, and the other of the opposed end portions is bent downward to form a simple diagonal rib 13, and the end portion is substantially in contact with the horizontal support surface 11. Has a cross-sectional structure. The horizontal support surface 11 only needs to be able to support most of the simple diagonal ribs 13 and need not be supported over the entire length (see FIG. 1). The floor plate 1 is deformed so that the back plate 3 follows the foundation floor surface with the separation opening 6 as a boundary, thereby eliminating rattling after laying. The width of the fractional opening 6 must be about 8 mm or less to the extent that the heel of the high heel does not fall, and the deformation of the back plate 3 when following the unevenness is extremely small. Set to 2 mm.
[0013]
A case where a load F is applied to such a fraction opening 6 will be described. First, when a load F is applied to the composite diagonal rib 12 side, the horizontal support surface 11 comes into surface contact with the back plate 3 to support the composite diagonal rib 12 as shown in FIG. Since the composite diagonal rib 12 has a section modulus increased by the horizontal support surface 11, sufficient structural strength can be secured. Such a horizontal support surface 11 can be formed so as to extend from the end of the composite diagonal rib 12 so as to have a U-shaped cross section. In this case, the bending process is required twice. In the present invention, since the surface plate 2 to the horizontal support surface 11 are formed by bending in a cross-sectional crank shape, the bending process is only required once, and as a result, the manufacturing cost can be suppressed.
[0014]
Next, when a load F is applied to the side of the simple diagonal rib 13 whose end is in contact with the horizontal support surface 11, as shown in FIG. 4, the simple diagonal line that is substantially in contact with the horizontal support surface 11. The end of the rib 13 presses the horizontal support surface 11 downward. When the core material 5 is filled as in this example, the core material 5 presses the horizontal support surface 11. In this way, the load F is also applied to the composite diagonal rib 12 via the horizontal support surface 11, and the composite diagonal rib 12 and the simple diagonal rib 13 counteract the load F together. The structural strength as the opening 6 is improved. In addition, compared with the case where diagonal ribs having a U-shaped cross section are formed at both ends sandwiching the diagonal line, the composite diagonal ribs 12 need only be formed at one of the end parts, and thus there is an advantage that material can be saved. As seen in FIG. 3 or FIG. 4, the horizontal support surface 11 is formed substantially horizontally, preferably slightly upward. As a result, the horizontal support surface 11 that is substantially in contact with the back plate 3 forms a gap between the back plate 3 and does not hinder the deformation of the floor plate at the fraction opening 6.
[0015]
【The invention's effect】
In the floor board of the present invention, the structural strength of the fraction opening provided to follow the foundation floor can be improved easily and at low cost. Specifically, the structure of the fractional opening of the present invention has less significant differences compared to the conventional structure and the number of processing procedures does not change, that is, the composite diagonal rib having a horizontal support surface is molded once. Since it can be performed collectively by bending, it has the advantage that it can be created using the same production line as before, and in addition, compared to the case where both ends sandwiching the diagonal are formed in a U-shaped cross section As a result, it is possible to secure a necessary and sufficient structural strength while suppressing an increase in cost.
[Brief description of the drawings]
FIG. 1 is a plan view of a free access floor board of the present invention.
FIG. 2 is a rear view of the same.
FIG. 3 is a cross-sectional view taken along line AA in FIG. 1 when a load F is applied to the composite diagonal rib side.
4 is a cross-sectional view taken along line AA in FIG. 1 when a load F is hung on the simple diagonal rib side. FIG.
[Explanation of symbols]
1 Free access floor board 2 Front panel 3 Back panel 6 Fraction opening
11 Horizontal support surface
12 Compound diagonal ribs
13 Simple diagonal ribs

Claims (1)

A free access that allows the front and back plates to be joined together at the periphery, and is deformed by its own weight at the boundary of the fractional opening formed by dividing the front plate by a diagonal line to follow the unevenness. In the floor plate, the fractional opening is formed by simply bending one of the opposite ends of the diagonal line downward to form a simple diagonal rib, bending the other of the end downwards, and further bending substantially horizontally to form a horizontal support surface. The composite diagonal rib is formed, and the end of the simple diagonal rib is substantially in contact with the horizontal support surface, and the horizontal support surface is in contact with the back plate. Access floor board.

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