JPH05272228A - Floor panel structure for double floor - Google Patents

Abstract

PURPOSE:To reinforce the corners of floor panels for double floor. CONSTITUTION:A floor panel 6 for double floor is made up by welding a square(plan view) metal top sheet 1 with a square(plan view) metal bottom sheet 5 which are lapped with each other. The bottom sheet 5 is provided with projected curved parts 4 whose upper ends are on a level with the peripheral side 2 from the bottom of the recession 3 formed to form an opening at the central part by leaving the peripheral side 2 toward the upside, in which at least the upper part of the rising parts 7 of the four corners of the recession 3 is projected upwards. By shortening the distance from the floor corners of the rising part 7 to the corners of the top sheet 1 without varying the distance from the upper end of the rising part 7 to the side end of the top sheet 1, the corners of the floor panels 6 for double floor can be reinforced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a floor panel for a double floor used as a wiring system in an office of an office building or a computer building.

[0002]

2. Description of the Related Art As a floor panel 6 for a double floor, which is conventionally used as a wiring system in an office of an office building or a computer building, there is known one as shown in FIG. The floor panel 6 for double floor has a leg device 31 fixed on a slab 30.
By mounting and attaching the floor panel 6 for double floors on the above, a double floor structure is formed, and various wirings are provided between the slab 30 and the floor panel 6 for double floors.

As the floor panel 6 for double floors, a floor panel 6 for double floors made of metal is known as shown in FIGS. 9 and 10. The floor panel 6 for double floors made of metal is known. , A top sheet 1 made of a metal plate having a quadrangular shape in a plan view, and a recessed portion 3 which is recessed so that a central portion thereof is opened upward while leaving a peripheral portion 2 and an upper end surface of the recessed portion 3 from the bottom to the upper side. A bottom sheet 5 made of a metal plate having a quadrangular shape in plan view, which is provided with a plurality of curved portions 4 at the same level as the peripheral portion 2, is overlapped so that both ends substantially coincide with each other on the four sides, and the bottom sheet is formed. The peripheral portion 2 of the reference numeral 5 and the upper surface portion of the bent portion 4 are welded to each other.

[0004]

However, in the above-mentioned conventional example, both the top sheet 1 and the bottom sheet 5 have a quadrangular shape in a plan view, and the ends of the top sheet 1 and the bottom sheet 5 are substantially coincident on the four sides. As shown in FIG. 12, the distances between the rising portions 7 at the four corners of the recess 3 and the corners of the topsheet 1 are between the rising portions 7 and the edges of the topsheet 1 because they are fixed in layers. Longer than distance,
There is a problem that the strength of the corner portion becomes weak.

Therefore, in the process of reaching the present invention, the inventor
By projecting the upper part of the rising part 7 around the recess 3 outward over the entire circumference and shortening the distance between the rising part 7 and the edge of the top sheet 1, the rising parts 7 at the four corners of the recess 3 are formed. The distance between the corners of the top sheet 1 was also shortened, and it was thought that this would prevent the strength of the corners from decreasing. However, when the top sheet 1 and the bottom sheet 5 are welded, the spot welding position is determined so that the top sheet 1 and the bottom sheet 5 are welded at the center of the protruding portion 4 of the bottom sheet 5 arranged at a constant interval as shown in FIG. Further, the peripheral portion of the bottom sheet 5 and the end portion of the top sheet 1 are welded at a position separated by the same distance as the distance between the central portions of the protruding portions 4, and as a result, the spot welding position Are positioned at equal pitches, and the upper portion of the rising portion 7 around the recess 3 is projected outward over the entire circumference as described above to shorten the distance between the rising portion 7 and the edge of the top sheet 1. Then, it is not possible to weld at the welding position at the end with the above-mentioned pitch, so it is necessary to change the welding position at the end, and it is necessary to change the equipment of the welding machine in the current manufacturing equipment. When Ri, moreover, were not practical when there is a problem in that the weld width the width of the peripheral portion 2 of the bottom sheet 5 is narrowed. 29 in the figure
Indicates a welded portion.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a structure of a floor panel for a double floor in which a corner portion does not become weak. is there.

[0007]

The structure of a floor panel for a double floor according to the present invention is such that a top sheet 1 made of a metal plate having a quadrangular shape in plan view and a peripheral portion 2 are left and a central portion thereof is opened upward. A bottom made of a metal plate having a quadrangular shape in plan view, which has a recessed portion 3 which is recessed and which has a plurality of protruding portions 4 projecting upward from the bottom of the recessed portion 3 at the same level as the peripheral portion 2. A double floor made of metal, which is formed by stacking the sheet 5 so that both ends of the sheet 5 substantially coincide with each other on the four sides and by welding the top sheet 1 with the peripheral portion 2 of the bottom sheet 5 and the upper surface portion of the protruding portion 4. The floor panel 6 for use is characterized in that at least the upper portions of the rising portions 7 at the four corners of the recess 3 are projected to the outside, and by adopting such a configuration, the problems of the above-mentioned conventional example are encountered. The point was solved and the object of the present invention was achieved. Than it is.

[0008]

According to the present invention having the above-described structure, at least the upper portions of the rising portions 7 at the four corners of the recess 3 are projected outward, so that the distance from the upper end of the rising portion 7 to the edge of the top sheet 1 is increased. The distance from the four corners of the rising portion 7 to the corners of the top plate 1 can be shortened without changing the distance, and this makes it possible to prevent the strength of the corners of the floor panel 6 for double floors from decreasing. Is. Since it is not necessary to change the distance from the upper end of the rising portion 7 to the edge of the top sheet 1, it is not necessary to change the welding position at the edge.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. The top sheet 1 is made of metal such as a steel plate and has a quadrangular shape in plan view. The top sheet 1 is flat and has a downward hanging piece 8 on the end side as shown in FIG. 6 and a downward hanging piece 8 as shown in FIG.
Some do not have. The bottom sheet 5 is made of metal such as a steel plate and has a quadrangular shape in plan view. The bottom sheet 5 has a recessed portion 3 having a quadrangular shape in a plan view, which is recessed so that a central portion thereof opens upward while leaving a peripheral portion 2.
And a plurality of curved portions 4 project vertically upward from the bottom of the concave portion 3 at a constant pitch, and the level of the upper end surface of the curved portion 4 is the same as that of the peripheral portion 2. It is a level. At least the upper portions of the rising portions 7 at the four corners of the concave portion 3 are projected to the outside to form projecting portions 9. Here, in the embodiment shown in FIGS. 2, 6, and 7, only the upper ends of the rising portions 7 at the four corners of the recess 3 are projected outward, but the rising and falling portions of the rising portions 7 at the four corners of the recess 3 are located above and below. The entire length in the direction may be projected outward.

Here, the top sheet 1 having a quadrangular shape in plan view
And the bottom sheet 5 having a quadrangular shape in plan view have substantially the same size and shape in plan view. Then, the top sheet 1 having a quadrangular shape in a plan view and the bottom sheet 5 having a quadrangular shape in a plan view are overlapped so that the ends of the top sheet 1 and the bottom sheet 5 are substantially coincident with each other. The upper sheet is welded to the top sheet 1 by spot welding. In this case, since it is not necessary to change the distance from the upper end of the rising portion 7 to the edge of the top sheet 1,
It is not necessary to change the welding position at the end, and welding can be performed using the same welding machine as the conventional one. Here, in the corner portion, as described above, at least the upper portions of the rising portions 7 at the four corners of the concave portion 3 are projected outward to form the projecting portion 9. However, when the projecting portion 9 is not provided, this corner portion is originally formed. In the above, since the distance from the upper end of the rising portion 7 to the corner of the top sheet 1 was long from the upper end of the rising portion 7 to the edge of the top sheet 1, the rising portion 7 at the four corners of the recess 3 was Even if the protruding portion 9 is provided at least in the upper portion, it is possible to perform welding without trouble as shown in FIG. 1 without changing the welding position in the corner portion. In FIG. 1, 29 indicates a welded portion.

Next, in the corner portion, as described above, at least the upper portions of the rising portions 7 at the four corners of the concave portion 3 are projected outward, and the projecting portion 9 is provided, and the projecting portion 9 is provided. The comparison in the case of performing the strength test of the conventional example not provided will be specifically described. FIG. 14 shows a test body A provided with the protruding portion 9. Further, FIG. 15 shows a test body B having no projecting portion 9. Specimen A shown in FIGS. 14 and 15
As shown in FIGS. 13 (a) and 13 (b), B is interposed between the upper fixing base 10 and the base 11 and attached by the fixing screw 12, and in this state, the upper surface of the corner portion is directly above. Was compressed by a loader having a diameter of 10 mm. A graph showing the elastic limit load and the amount of flexure of the test body A provided with the protruding portion 9 in this test is shown in FIG. 16, and the graph showing the elastic limit load and the amount of flexure of the test body B without the protruding portion 9 provided. Is shown in FIG. As you can see from this graph,
The test piece A provided with the protruding portion 9 has an elastic limit load of 154K.
g, the bending amount is 0.42 mm, and the test body B not provided with the protruding portion 9 has an elastic limit load of 154 kg and a bending amount of 0.4.
It was 2 mm. The elastic limit load here means a load at which the corner portion does not return to the original planar state even when the state in which this load is applied is removed, and the amount of deflection indicates the value at which the corner is lowered from the planar shape. .. As is clear from the above-mentioned test results, as in the present invention, at least the upper portions of the rising portions 7 at the four corners of the concave portion 3 are projected to the outside and the projecting portions 9 are provided, which are excellent in the reinforcing effect in the corner portion. It turns out.

[0012]

As described above, according to the present invention, at least the upper portions of the rising portions of the four corners of the recessed portion of the bottom sheet are projected outward, so that the corner portions of the floor panel for double floors can be reinforced. It is possible to prevent the strength of the corners from decreasing, and since the protruding portions protruding outward are provided at the rising portions of the four corners of the recess of the bottom sheet, the outer periphery is provided on the entire periphery of the rising portion of the recess. It is not necessary to change the distance from the upper end of the rising part to the edge of the top sheet as in the case of providing a protruding part toward the end, and as a result, it is not necessary to change the welding position at the end and It becomes possible to perform welding using a machine, and the distance from the upper edge of the rising edge of the edge of the recess to the edge of the top sheet does not become short, which hinders welding. Without those.

[Brief description of drawings]

FIG. 1 is a partially omitted bottom view of the present invention.

FIG. 2 is a sectional view taken along line B-C-C-B in FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an overall perspective view of the above.

FIG. 5 is a perspective view of the same as seen from the back side.

FIG. 6 is a sectional view of the above.

FIG. 7 is a sectional view of another embodiment of the above.

FIG. 8 is an overall perspective view showing a construction state of the above.

FIG. 9 is a rear view showing the entire conventional example.

FIG. 10 is a sectional view of the above.

FIG. 11 is a sectional view of a conventional example.

FIG. 12 is a perspective view of the conventional example seen from the back side.

13 (a) and 13 (b) are exploded perspective views showing a test body of the present invention and a conventional test body, respectively.

14 (a) and 14 (b) are respectively a bottom view and a front view of a test body of the present invention used in the same as above.

15 (a) and 15 (b) are respectively a bottom view and a front view of a conventional test body used in the above.

FIG. 16 is a graph showing the elastic limit load of the test body of the present invention.

FIG. 17 is a graph showing the elastic limit load of a conventional test body.

[Explanation of symbols]

 1 Topsheet 2 Peripheral part 3 Recessed part 4 Bent part 5 Bottom sheet 6 2 Floor panel for double floor 7 Standing part

Claims (1)

[Claims] 1. A top sheet made of a metal plate having a quadrangular shape in a plan view, and a recessed portion which is recessed so that a central portion thereof is opened upward while leaving a peripheral portion, and an upper end surface of which is upward from a bottom of the recessed portion. The bottom sheet, which is made of a metal plate with a rectangular shape in plan view and has a plurality of curved portions at the same level as the peripheral portion, is overlapped so that the ends of both sides are substantially coincident with each other. In a floor panel for a double floor made of metal, which is welded to a top sheet at the upper portion of the curved portion, at least upper portions of rising portions of four corners of the recess are projected outward. The structure of the floor panel for the floor.