JPH08100511A - Floor panel - Google Patents

Abstract

PURPOSE: To prevent a local strain from occurring due to a concentrated load in the middle. CONSTITUTION: A floor panel is composed of the upper plate and the lower plate. Peripheral circular protrusions 24 facing downward, radially formed protrusions 25 facing downward, fitting holders 26, a central protrusion 27 facing upward, and middle protrusions 28 facing upward are formed in the lower plate which is connected to the upper plate with the central protrusion 27, the middle protrusions 28, and the external peripheral flange 31. The floor panel is retained in a state that it is made afloat above the floor face by the fitting holders 26. Upward protrusions 30 at the corners are arranged at the inner side positions than the fitting holders 26 of the joined part 25b of the radially extending downward protrusions 25 and the peripheral circular downward protrusions 24. The bottom wall 30a of the upward protrusions at the corners is connected to the lower face of the upper plate and the side walls of the central upward protrusion 27, the middle upward protrusions 28 and the upward corner protrusions 30 are constituted of slant walls 27b, 28b, 30b. The slant wall 28b of the middle upward protrusions 28, the slant wall 27b of the central upward protrusion 27 and/or the slant wall 30b of the upward protrusions 30 at the corners 27 are mutually closely positioned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor panel laid on a floor of a building to form a double floor.

[0002]

2. Description of the Related Art When a floor panel group is laid on a floor surface of a building to construct a double floor, a cable such as a telephone or a computer can be freely wired in a space between the floor panel group and the floor surface. You can By providing a cable outlet on the floor panel, the cable routed between the floor panel and the floor surface can be pulled out from the desired location onto the floor panel and connected to the desired telephone, computer, etc. You can

Conventionally, as this type of floor panel, the one disclosed in Japanese Utility Model Laid-Open No. 3-99140 is known. FIG. 10A is a bottom view of this floor panel, and FIG.
(B) is a sectional view taken along the line Xb-Xb of FIG.

The floor panel 1 has a square flat plate-shaped upper plate 2 and an outer peripheral edge having substantially the same contour as the upper plate 2, and is disposed so as to be superposed on the lower side of the upper plate 2. Lower plate 3 joined
Consists of Both the upper plate 2 and the lower plate 3 are made of steel plates.

The lower plate 3 is strengthened by forming various concave projections by embossing.
That is, the lower plate 3 has a downwardly projecting peripheral edge annular protrusion 4 formed in a square ring shape along the outer peripheral edge of the lower plate 3, and the base end side of the lower plate 3 joins each other at the center of the plate surface. Along with
The downwardly projecting radial projections 5 that extend radially from the base-end side confluence 5a toward the respective corners 1a of the outer peripheral edge and each tip joins the respective corners 4a of the peripheral annular projection 4 and a peripheral edge. The attachment holding portion 6 arranged at each corner portion 4a of the annular protrusion portion 4 and the proximal end side confluence portion 5 of the radial protrusion portion 5.
a downwardly concave central concave portion 7 arranged at the center position of a,
There is provided a downward concave intermediate recess 8 surrounded by the peripheral annular projection 4 and the radial projection 5, and a downward projection-shaped central projection 9 disposed in the intermediate recess 8. These are all formed symmetrically with respect to the center O of the plate surface of the lower plate 3.

In this case, the central projection 7 has a shape of a truncated cone having a relatively small diameter, and the boundary between the inclined wall 7b forming the side wall thereof and the edge of the side wall 8b of the intermediate recess 8 has a ratio. And a wider flat portion 10 is formed. This flat portion 10 is
It forms a part of the lower surface wall of the base-side confluence portion 5a of the radial projection portion 5 (this is also a projection portion having a downward projection shape).

The bottom walls 7a, 8a of the central recess 7 and the intermediate recess 8 formed in the lower plate 3 and the flange portion 11 formed on the outer peripheral edge of the lower plate 3 are provided on the lower surface of the upper plate 2. The upper plate 2 and the lower plate 3 are integrated by abutting and joining. The spots shown by black dots in FIG. 10A are joints by spot welding.

The floor panel 1 thus constructed is
Since the attachment holding portions 6 at the four corners are supported by the support legs and the like, the attachment holding portions 6 are held in a state of floating at a predetermined distance from the construction foundation surface.

When a downward load is applied to the central portion of the floor panel 1 in that state, the load is dispersed outward along the inclined wall 7b of the central concave portion 7 to the radial protrusion 5 via the flat portion 10. It is transmitted and is widely dispersed in the direction away from the center O by the radial protrusions 5, and is also dispersed on the upper plate 2 side. Then, the forces dispersed in various directions are finally transmitted to the lower surface wall of the peripheral annular projection 4 (the top wall of the projection 4), and from there to the floor surface via the attachment holder 6.

Therefore, according to the floor panel 1, the load concentrated on the central portion of the plate surface can be widely dispersed, so that the central portion does not sink locally and the total strain is reduced. It can be reduced.

[0011]

However, as a near and far desire, there is a demand for further reducing the strain amount with respect to the load.

In consideration of the above circumstances, it is an object of the present invention to provide a floor panel capable of further reducing the amount of strain when a large concentrated load is applied to the central portion.

[0013]

According to a first aspect of the present invention, there is provided a polygonal flat plate-shaped upper plate and a lower plate having an outer peripheral edge having substantially the same contour as that of the upper plate and arranged below the upper plate. A lower plate, and the lower plate includes a downwardly projecting peripheral edge annular downward projecting portion formed in an annular shape along an outer peripheral edge of the lower plate, and a base end side of the lower plate at the plate surface center position. While merging, it extends radially from the base end side merging portion toward each corner portion of the outer peripheral edge,
Radial downward projections of downward projections, each tip of which merges with each corner of the peripheral annular downward projection, and a mounting holder arranged at each corner of the peripheral annular projection,
A downwardly concave central concave portion disposed at the base end side confluence portion of the radial downwardly projecting portion, and an upwardly projecting intermediate upwardly projecting portion surrounded by the peripheral annular downwardly projecting portion and the radially downwardly projecting portion. Each of the bottom walls of the center upward protrusion and the intermediate upward protrusion formed on the lower plate and the outer peripheral edge of the lower plate are brought into contact with the lower surface of the upper plate to be joined to each other, thereby In a floor panel in which a plate and a lower plate are integrated and are supported in a state of being floated from a construction foundation surface by a predetermined distance by supporting the attachment holding portion, the radial downward projection and the peripheral annular downward projection At the position of the confluence portion of the portion inside the attachment holding portion, an upward protruding corner upward protruding portion is provided, and the bottom wall of the corner concave portion is brought into contact with the lower surface of the upper plate to be joined, and Center upward protrusion, middle The side walls of the upward protrusions and the corner upward protrusions are formed by inclined walls so that the cross sections of the upward protrusions are open downward, and the inclined wall of the intermediate upward protrusion and the central upward protrusion are formed. Inclined wall and /
Alternatively, it is characterized in that the inclined wall of the corner upward protruding portion is made to approach each other or intersect in the middle of the height direction.

According to a second aspect of the present invention, there is provided the floor panel according to the first aspect, wherein the intermediate upwardly projecting inclined wall and the corner upwardly projecting inclined wall and / or the central upwardly projecting inclined wall are provided. , Are formed so as to be in contact with each other.

A third aspect of the present invention is the floor panel according to the first or second aspect, wherein a flange bent downward is formed on the outer peripheral edge of the upper plate, and the outer peripheral edge of the lower plate is inside the flange. It is characterized in that it is arranged in.

A fourth aspect of the present invention is the floor panel according to any one of the first to third aspects, wherein the central upward projection is formed in a substantially hemispherical shape or a truncated cone shape. .

A fifth aspect of the present invention is the floor panel according to any one of the first to fourth aspects, wherein the corner upward protrusion is formed in a substantially hemispherical shape or a truncated cone shape. .

A sixth aspect of the present invention is the floor panel according to any one of the first to fifth aspects, characterized in that a cutout portion is provided in a part of the outer peripheral edge of the panel body except for a corner portion. To do.

According to a seventh aspect of the present invention, in the floor panel according to the sixth aspect, the outer peripheral edge of the upper plate is folded back from the lower side to the inner peripheral side at the notch to cover the outer peripheral edge of the lower plate. It is characterized by

The invention according to claim 8 is the floor panel according to any one of claims 1 to 7, wherein both the upper plate and the lower plate are made of steel plates having a thickness of 0.8 mm to 1.5 mm. Characterize.

A ninth aspect of the present invention is the floor panel according to any one of the first to eighth aspects, wherein the lower plate is set to have a smaller thickness than the upper plate. .

A tenth aspect of the present invention is the floor panel according to any one of the first to ninth aspects, wherein the upper plate and the lower plate bite a part of the upper plate into the inside of the lower plate. , Which are joined to each other.

The invention of claim 11 is the floor panel according to any one of claims 1 to 9, characterized in that the upper plate and the lower plate are joined to each other by welding.

A twelfth aspect of the present invention is the floor panel according to any one of the first to eleventh aspects, characterized in that both the upper plate and the lower plate are made of a rust-proof treated steel plate.

[0025]

According to the first aspect of the present invention, when the load acts downward on the central portion of the upper plate, the force propagates obliquely downward along the inclined wall of the central upward protrusion of the lower plate. When the inclined wall of the central upward protrusion and the inclined wall of the intermediate upward protrusion are approached or intersected on the way, the force transmitted to the inclined wall of the central upward protrusion is immediately transferred to the inclined wall side of the adjacent intermediate upward protrusion. It is transmitted. In other words, if there is a large flat part at the boundary between the inclined wall of the central upward protrusion and the inclined wall of the intermediate upward protrusion, the inclined walls are separated from each other, and the middle upward from the inclined wall of the central upward protrusion. Although it is difficult to transmit the force to the sloped wall of the upward protrusion, if the sloped walls are close to or intersect with each other with almost no flat part, the force applied to the sloped wall on the center upward protrusion is immediately detected. It is transmitted to the sloped wall on the side of the middle upward protrusion. The inclined wall of the intermediate upward protrusion is equivalent to the side wall of the radial downward protrusion in the portion inside the peripheral annular downward protrusion, so the force transmitted to the inclined wall of the intermediate upward protrusion is radiated by the radial downward protrusion. It is distributed efficiently in the direction. The force transmitted to the inclined wall of the intermediate upward protrusion is widely dispersed and transmitted to the upper plate because the bottom wall of the intermediate upward protrusion is joined to the upper plate.

The force distributed in the radial direction through the radial downward protrusions is received by the attachment holders located on the extension of the radial downward protrusions, and is transmitted to the floor surface through the respective attachment holders. At this time, since the corner recesses in which the bottom wall is joined to the upper plate are provided inside the attachment holding portion, the rigidity of that portion is increased and the force between the upper plate and the lower plate is increased. The forces are transmitted to each other, and the force transmitted to the lower plate side is transmitted to the floor surface via the attachment holding portion. Further, the force transmitted to the upper plate side is transmitted from the outer peripheral edge side to the lower plate and is transmitted to the floor surface via the attachment holding portion.

Further, a part of the force transmitted to the radial downward protrusions bypasses the corner upward protrusions and is distributed to the peripheral annular downward protrusions, and the peripheral annular downward downward protrusions side the floor surface via the attachment holders. Be transmitted to. In addition, when the inclined wall of the corner upward protrusion and the inclined wall of the middle upward protrusion are close to or intersect with each other, the rigidity in the vicinity is further increased and the integrity of the upper plate and the lower plate is improved. The force around the part is smoothly dispersed, and local stress concentration is relieved. Therefore, even when a load is concentratedly applied to the central portion of the floor panel, the force is efficiently dispersed and transmitted to the floor surface side, and the local concentration of stress is further improved.

According to the second aspect of the present invention, since the inclined walls are provided so as to be in contact with each other, the height of the inclined walls can be sufficiently secured and the flat portion of the boundary between the inclined walls can be minimized. .

According to the third aspect of the present invention, the flanges on the outer peripheral edge of the upper plate prevent the upper plate and the lower plate from being bent near the outer peripheral edge and protect the outer peripheral edge. Further, the lower plate can be positioned by the flange.

According to the fourth aspect of the present invention, since the central upwardly projecting portion arranged in the center of the lower plate is formed in a substantially hemispherical shape or a truncated cone shape, the section modulus of the portion can be increased.

According to the fifth aspect of the present invention, since the corner upward protrusions disposed near the corners of the lower plate are formed in a substantially hemispherical shape or a truncated cone shape, the section modulus of the portion can be increased.

In the invention of claim 6, the lower space of the floor panel and the upper space of the floor panel can be connected to each other through the notch provided in the outer peripheral edge, so that the wiring arranged in the lower space from the floor space can be connected to the floor panel. Can be pulled out.

In the seventh aspect of the invention, since the upper plate is bent to cover the outer peripheral edge of the lower plate at the notch,
You can eliminate the edge exposure. Further, since the strength is increased by bending, bending is prevented.

In the invention of claim 8, the upper plate and the lower plate are 0.8
Since it is made of a steel plate with a thickness of mm to 1.5 mm, it is possible to satisfy the strength performance while minimizing the cost and weight.

According to the ninth aspect of the present invention, since the thickness of the lower plate is made smaller than that of the upper plate, the lower plate can be easily processed, the weight can be reduced, and the strength can be increased by the projection processing. it can.

According to the tenth aspect of the present invention, since the upper plate and the lower plate are joined by biting a part of the upper plate into the inside of the lower plate, rust is unlikely to occur at the joined portion and the joining is highly reliable. You can get a part. In addition, compression press working is possible, and thereby surface rigidity can be improved.

According to the eleventh aspect of the invention, since the upper plate and the lower plate are joined by welding, they can be joined easily. Further, the surface can be smoothed as compared with the compression press working.

According to the twelfth aspect of the present invention, since the upper plate and the lower plate are made of the anti-rust treated steel plate, rust does not occur.

[0039]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a bottom view of a floor panel according to an embodiment of the present invention. 2 is a cross-sectional view taken along the arrow in FIG.
(A) is a sectional view taken along the line IIa-IIa, and (b) is IIb-.
IIb arrow sectional view, (c) is IIc arrow sectional view, (d)
Is a sectional view taken along the arrow IId. FIG. 2 shows a cross-section with the top and bottom corrected.

The floor panel 21 of this embodiment has a square flat plate-shaped upper plate 22 and an outer peripheral edge having substantially the same contour as the upper plate 22 and is arranged so as to be superposed on the lower side of the upper plate 22. Board 22
And the lower plate 23 joined to.

Both the upper plate 22 and the lower plate 23 are made of steel plates. In this embodiment, the upper plate 22 has a thickness of 1.4 mm and the lower plate 23 has a thickness of 1.4 mm.
Is composed of a steel plate having a thickness of 1.2 mm. The thickness of the steel plate is preferably in the range of 0.8 mm to 1.5 mm in consideration of strength performance, weight reduction, and workability, and the lower plate 23 is subjected to various drawing processes than the upper plate 22. It is desirable to make it thin. As the steel plate, it is possible to use an ordinary steel plate, a galvanized steel plate, and a vibration damping steel plate, which are inexpensive in price. The use of a rustproof steel plate can prevent the occurrence of rust.

The lower plate 23 is strengthened by forming various vertical protrusions by drawing. That is, the lower plate 23 has a downwardly projecting peripheral edge annular downward projection 24 formed in a substantially square shape along the outer peripheral edge inside the outer peripheral edge of the lower plate 23, and a plate surface center of the lower plate 23. At the position, the base end sides join each other, and the base end side joining portion 25
Radial downward projections that extend radially from a toward each corner portion 23a of the outer peripheral edge (in this case, a cross shape along the diagonal line), and each tip joins each corner portion 24a of the peripheral annular downward projection portion 24. The downward protruding portion 25, the attachment holding portion 26 arranged at each corner portion 24a of the peripheral annular downward protruding portion 24, and the upward protruding portion arranged at the center position of the base end side confluent portion 25a of the radial downward protruding portion 25. Center upward projection 27, a peripheral annular downward projection 24, and a radial downward projection 25, and an intermediate upward projection 28 of upward projection shape, and a middle shell-shaped arrangement in the intermediate upward projection 28. The downwardly projecting middle-shaped downward projecting portion 29, the radial downward projecting portion 25 and the peripheral annular downward projecting portion 24 are joined to each other at a position inside the attachment holding portion 26 of the joining portion 25b. It is equipped with a corner upward protruding portion 30 of the upward projection type. All of these are lower plates 23
Is formed symmetrically with respect to the center O of the plate surface.

The central concave portion 27 has a substantially circular truncated cone shape (or a hemispherical shape with a flat top portion) having a relatively large diameter, and a side wall composed of a bottom wall 27a and an inclined wall 27b surrounding the bottom wall 27a. And have. Corner upward protrusion 30
Also has a truncated cone shape (or may have a hemispherical shape with a flat top), and has a bottom wall 30a and a side wall composed of an inclined wall 30b surrounding the bottom wall 30a. The middle upward protrusion 28 also has a bottom wall 28a and a side wall including an inclined wall 28b surrounding the bottom wall 28a. Therefore, the cross sections of the center upward protrusion 27, the intermediate upward protrusion 28, and the corner upward protrusion 30 are all open downward.

In addition, at a position where the intermediate upward protrusion 28 and the central upward protrusion 27 are adjacent to each other, the intermediate upward protrusion 2 is formed.
8 and the slanted wall 27 of the center upward protruding portion 27.
The edges (lower edges) of the inclined wall 28b and the inclined wall 27 are formed so as to come into close contact with each other.
There is almost no flat portion (the portion indicated by reference numeral 10 in FIG. 10) at the boundary of b. This portion is a portion indicated by P1 in FIGS. Further, even at a location where the intermediate upward protrusion 28 and the corner upward protrusion 30 are adjacent to each other, the edges (lower edges) between the inclined wall 28b of the intermediate upward protrusion 28 and the inclined wall 30b of the corner upward protrusion 30 are close to each other. And formed almost in contact with each other,
As a result, there is almost no flat portion at the boundary between the inclined wall 28b and the inclined wall 30b. This part is shown in Figure 1.
In FIG. 2, it is a portion indicated by P2.

Then, the center upward protrusions 27, the intermediate upward protrusions 28, the bottom walls 27a, 28a, 30a of the corner upward protrusions 30 formed on the lower plate 23 and the outer peripheral edge of the lower plate 3 are formed. The upper plate 22 and the lower plate 23 are integrated by bringing the flange portion 31 into contact with and joining the lower surface of the upper plate 22. A portion indicated by a black dot in FIG. 1 is the joint portion 100. The joining in this case may be performed by spot welding or rivets, but the joining portion 1 of the present embodiment
In 00, the upper plate 22 and the lower plate 23 are caulked and joined by causing a part of the upper plate 22 to bite into the inside of the lower plate 23 with a press-type punch and die as shown in FIG.
That is, the upper plate 22 is provided with a recess 101 from above,
The opposite side (lower surface side) is provided with a die to form a wedge-shaped (tapered shape of downward expansion) protrusion 102, and the protrusion 102 is engaged by being embedded in a recess 103 of the lower plate 23 to join them. The size of the recess 101 is preferably about 5 mm, which is smaller than the heel of a female high heel.

Further, the flange 31 portion of the outer peripheral edge of the lower plate 23 is formed as a fixing margin, and is accommodated inside the flange 33 formed by bending downward on the outer peripheral edge of the upper plate 22,
It is joined to the upper plate 22 while being positioned here. The tops of the protrusions 27, 28 and 30 are protruded by a substantially flat amount, but it is preferable that the top of the central protrusion 27 be slightly higher than the other protrusions 28 and 30.

Further, at the four corners of the floor panel 21, connecting tool mounting portions 35 are formed in a semicircular shape.
As shown in FIG. 3, each connector attachment part 35 is bent downward in the vertical direction in a state where the upper plate 22 and the lower plate 23 are joined, and then further bent horizontally so that only the tip of the upper plate 22 is bent. It is formed in a shape that is bent upward. The connecting tool mounting portion 35 forms four circular holes in a state in which four floor panels 21 are butted against each other, and four connecting tools (not shown) are inserted into the circular holes. Mounting part 3
By engaging the connector with the engaging portion of 5, the four floor panels 21 are interconnected.

Burring holes as attachment holding portions 26 on the lower plate 23 side and burring holes as attachment holding portions 37 on the upper plate 23 side are formed inside the four connector attachment portions 35 of the floor panel 21. A sleeve 39 having an internal thread formed on the inner circumference thereof is fitted into these burring holes. As shown in FIG. 2C, the lower plate 23
A step surface 26a for receiving the sleeve 39 is formed around the attachment holding portion 26. An adjusting screw 40 for adjusting the vertical position is screwed onto the sleeve 39. The lower end of the adjusting screw 40 is rotatably engaged with a pedestal 44 of a support stand 42 provided on the floor surface 46, and the adjusting screw 40 serves as an attachment holding portion 37 on the upper plate 23 side. Adjust screw 4 by turning it through the burring hole
It is possible to adjust the height of the floor panel 21 which is held in a state of being floated from the floor surface 46 via 0 and the support stand 42.

Further, as shown in FIG. 1, the floor panel 2
A pair of cable outlets (notches) 52 are formed in a substantially U-shape on one of the four opposite sides of the front, rear, left, and right sides in FIG. This cable outlet 52 is shown in FIG.
As shown in (d), the peripheral edge 52a of the substantially U-shaped notch provided on the lower plate 23 is covered with the peripheral edge 52b of the substantially U-shaped notch provided on the upper plate 22. Has been formed. That is, the peripheral edge portion 52b on the upper plate 23 side is bent downward and then folded back inward, and the bag-like folded portion covers the peripheral edge portion 52a on the lower plate 23 side, and in that state 52a and 52b are crimped to each other. The cable outlet 52 allows cables (not shown) wired in the space below the floor panel group 21 to be drawn out to the space above the floor panel group 21.

Next, a method of using the floor panel 21 having the above structure will be described.

When laying the floor panel 21 on the floor surface, as shown in FIG. 3, the adjusting screws 40 of the support stand 42 previously installed on the floor surface 46 are screwed into the respective sleeves 39 at four locations. . Accordingly, the floor panel 21 can be placed on the floor surface 46 via the support stand 42. Then, by turning the adjusting screw 40 in that state, the height is adjusted, and the floor panel 21 is kept in a constant horizontal state.
Can be held. In this way, when a plurality of floor panels 21 are placed on the floor surface, the connecting tool mounting portions 35 of the four corners of the four floor panels 21 that are butted against each other are attached.
To the floor panel 21 by engaging a connector (not shown) with the floor panel 21.
Are interconnected with each other. This allows a plurality of floor panels 21 to be laid on the floor surface 46 in a stable state.

When connecting a cable for a telephone, a computer or the like, the cable wired on the floor surface 46 is pulled out from the cable outlet 52 onto the floor panel 21 and connected to the telephone or the like. Then the floor panel 21
Set up a desk and electric equipment on top of this. In this state, the floor panel 21 may be heavily loaded as a whole, or may be intensively heavily loaded.

The floor panel 21 of this embodiment includes a lower plate 23.
Is formed in the shape of a protrusion in the vertical direction and is integrated with the upper plate 22, so that a box cross-section is formed at a portion where each protrusion is present. Therefore, when a large load is applied to the entire upper surface of the floor panel 21, the cross section of the box exhibits sufficient rigidity, so that the floor panel 21 is not locally distorted.

When a large load is intensively applied to the central portion of the floor panel 21, the central portion is first moved to the lower plate 2.
Since it is connected to the upper plate 22 by the center upward protruding portion 27 of 3, the plate thickness is double and the rigidity is double. Moreover,
When a load acts downward on the center, the force is applied to the lower plate 22.
The light propagates obliquely downward along the inclined wall 27b of the upwardly projecting portion 27 of the center. Here, since the inclined wall 27b of the central upward protruding portion 27 and the inclined wall 28b of the intermediate upward protruding portion 28 are in contact with each other, the force transmitted to the inclined wall 27b of the central upward protruding portion 27 is immediately adjacent to the intermediate upward protruding portion 27. It is transmitted to the inclined wall 28b side of the portion 28. That is, if there is a large flat portion (the portion indicated by reference numeral 10 in FIG. 10) at the boundary between the inclined wall 27b of the central upward protrusion 27 and the inclined wall 28b of the intermediate upward protrusion 28, the inclined walls 27b, 28b. In the state where they are separated from each other, it is difficult to transmit the force from the inclined wall 27b of the central upward protruding portion 27 to the inclined wall 28b of the intermediate upward protruding portion 28, but there is almost no flat portion thereof.
Since b and 28b are close to each other, the force applied to the inclined wall 27b on the central upward protrusion 27 side is immediately transmitted to the inclined wall 28b on the intermediate upward protrusion 28 side.

The inclined wall 28b of the intermediate upward protrusion 28 is
Since the portion inside the peripheral annular downward projection 24 corresponds to the side wall of the radial downward projection 25, the force transmitted to the inclined wall 28b of the intermediate upward projection 28 is efficiently emitted radially by the radial downward projection 25. Dispersed and transmitted. Further, the force transmitted to the inclined wall 28 b of the intermediate upward protruding portion 28 is generated by the bottom wall 28 a of the intermediate upward protruding portion 28.
Since it is joined to No. 2, it is widely dispersed and transmitted to the upper plate 22.

The force distributed in the radial direction via the radial downward protrusions 25 is received by the attachment holders 26 located on the extension of the radial downward protrusions 25, and the floors are received via the respective attachment holders 26. It is transmitted to the surface. At this time, since the corner upward protrusion 30 in which the bottom wall 30a is joined to the upper plate 23 is provided inside the attachment holding portion 26, the rigidity of that portion is increased and the upper plate 22 and the lower plate 22 are lowered. Forces are mutually transmitted to and from the plate 23, and the force transmitted to the lower plate 23 side is transmitted to the floor surface via the attachment holding portion 26. Also,
The force transmitted to the upper plate 22 side is transmitted from the outer peripheral edge side to the lower plate 23, and is transmitted to the floor surface via the attachment holding portion 26.

Further, a part of the force transmitted to the radial downward projections 25 bypasses the corner upward projections 30 and is distributed to the peripheral annular downward projections 24, and the attachment holding portion 26 is provided from the peripheral annular downward projections 24 side. Is transmitted to the floor via. Further, since the inclined wall 30b of the corner upward protruding portion 30 and the inclined wall 28b of the intermediate upward protruding portion 28 are close to each other, the rigidity in the vicinity thereof is further increased and the integrity of the upper plate 22 and the lower plate 23 is increased. Especially, the force around the attachment holding portion 26 is smoothly dispersed, and the local stress concentration is alleviated. Therefore, even when a load is concentrated on the central portion of the floor panel 21, the force is efficiently dispersed and transmitted to the floor surface side, and the local anti-bending property is further improved.

Next, the results of the bending test with a downward concentrated load (300 kgf) applied to the central portion of the floor panel 21 of this embodiment with and without the characteristic points will be described.

The floor panel 21 according to this embodiment, which has the characteristic points, is made of a galvanized steel plate having an upper plate 1.4 mm thick and a lower plate 1.2 mm, which is a square having a size of 500 mm × 500 mm as a whole. The diameter of 27 is 112 mm,
The top diameter is 55 mm, and the corner upward protrusion 30
Has a top diameter of 40 mm with a diameter of 80 mm. On the other hand, the floor panel (comparative example) to be compared with this has a center upward protrusion 27 having a diameter of 100 mm and does not have a corner upward protrusion. All other configurations are the same. The protrusion amount of the protrusions 27, 28, 30 is 23
The dimensions of the other parts in mm are shown in FIG. 5 in a substantially reduced form.

5 and 6 show the floor panel 21 of this embodiment.
The position of the measurement point for performing the flexure test is shown. Figure 6
Is a bottom view of the floor panel 21, and FIG. 6A is VI of FIG.
FIG. 6B is a sectional view taken along the line VIb of FIG. 5, and FIG. FIG. 7A is a diagram showing the position of the measured cross section, FIG.
(B)-(d) is a figure which shows the amount of displacement of each measurement point measured at the position of the cross section A, the cross section B, and the cross section C shown in FIG.7 (a), respectively. The required number of measurement points is determined for each cross section A, B, C at intervals up to (they are marked with "'""""as necessary). 8A and 8B show how the cross section A is deformed, where FIG. 8A shows the case of the comparative example, and FIG. The solid line shows the shape before deformation, and the dotted line shows the shape after deformation.

As a result of the measurement, as shown in FIGS. 7 (b) to 7 (d), the diameter of the central upward protruding portion 27 is from 100 mm to 1 mm.
It can be seen that the displacement amount δ is greatly reduced in the whole in this example in which the corner upward protrusion 30 having a diameter of 80 mm and a top diameter of 40 mm is added to 12 mm, as compared with the comparative example. In particular, the amount of displacement at the central portion is greatly reduced, as can be seen from FIG. This is because, as described above, in the case of the comparative example, the flat portion 10 exists next to the upward center protrusion 27 due to the small diameter of the upward center protrusion 27. The intersection 10a of the inclined wall 27b of No. 27 is bent and deformed, and thereby the central portion is largely displaced downward, but in the case of this embodiment, since there is almost no flat portion, it is transmitted to the inclined portion 27b of the central upwardly projecting portion 27. Force is applied almost directly to the inclined wall 2 on the side of the intermediate upward protrusion 28.
It is considered that it is transmitted to 8b and diffused through the radial protrusions 25.

Incidentally, the displacement amount δ1 of the central portion in the case of the comparative example is 2.5 to 2.6 mm / 300 kgf, whereas the displacement amount δ2 of the central portion in the case of this embodiment is 1.6.
It was 5 to 1.7 mm / 300 kgf.

As another effect, the floor panel 21 of this embodiment secures a space below the upper plate 22 by the vertical projection shape provided on the lower plate 23. It is possible to prevent vibrations when a person walks or carries a load while being laid on the.

Further, since the flange 33 is provided on the outer peripheral edge of the upper plate 22, it is possible to prevent the upper plate 22 and the lower plate 23 from being bent near the outer peripheral edges thereof.
The outer peripheral edge of can be protected.

Further, since the flange 33 can facilitate the positioning of the lower plate 23, it contributes to the improvement of the production efficiency.

Further, in the floor panel 21 of this embodiment, the center upward protrusion 27 and the corner upward protrusion 30 are formed in a substantially hemispherical shape or a truncated cone shape, so that the section modulus of the same portion can be increased. This contributes to increasing the rigidity of the surrounding area.

In the cutout portion of the cable outlet 52,
By bending the peripheral portion 52b on the upper plate 22 side, the lower plate 2
Since the peripheral edge portion 52a of 3 is covered, the exposure of the edge can be eliminated and the cable can be protected. Further, by adopting a structure that is bent and caulked, it is possible to increase the strength of this portion and prevent bending deformation.

Further, since the upper plate 22 and the lower plate 23 are joined by causing a part of the upper plate 22 to bite into the inside of the lower plate 23, rust is unlikely to occur in the joint portion 100, and the reliability is high. A high joint can be obtained. Further, since the compression press working is performed, the surface rigidity can be improved.
In addition, when rust during use is not a concern, the upper plate 22 and the lower plate 23 can be joined by spot welding, and the joining can be performed more easily than by compression pressing, and the surface can be smoothed.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

A floor panel 12 of another embodiment shown in FIG.
In No. 1, the shape of the center upward protrusion 127 and the corner upward protrusion 130 is not a truncated cone shape but an octagonal pyramid shape. Also in this case, the center upward protrusion 127 has a side wall including a bottom wall 127a and an inclined wall 127b surrounding the bottom wall 127a. In addition, the corner upward protrusion 130 is provided on the bottom wall 1
It has a side wall composed of 30a and an inclined wall 130b surrounding it. The relationship between the slanted walls 127b and 130b and the slanted wall 28b of the intermediate upward protruding portion 28 is set in the same manner as in the above embodiment. Other frustum shapes may of course be used.

Further, in the above-mentioned embodiment, the inclined walls of the center upward protrusion and the corner upward protrusion and the inclined wall of the intermediate upward protrusion are formed so that their edges are in contact with each other, and the height of the adjacent inclined walls is increased. However, even if the inclined walls are made to intersect each other in the height direction, an effect close to the above-mentioned effect can be expected.

The shape of the floor panel is not limited to the square plate shape, but may be a polygonal plate shape such as a triangle or a hexagon.

Further, the floor panel having the above-mentioned structure can secure a sufficient load strength for practical use by being formed by using a metal plate material, but especially when a load strength higher than that is required, When the steel plate is particularly thin, the internal space between the upper plate and the lower plate may be filled with a reinforcing material such as foaming cement or mortar.

Further, in the above description, the terms "upward" and "downward" are used with the floor panel being installed as a reference.

[0076]

As described above, according to the invention of claim 1, the sinking of the upper plate when a large load is concentratedly applied to the central portion of the floor panel can be further improved.

According to the second aspect of the present invention, since the flat portion between the inclined walls is substantially eliminated, the depression of the upper plate can be further improved.

According to the third aspect of the invention, the flange provided on the outer peripheral edge of the upper plate can prevent the outer peripheral edge of the floor panel from being bent and protect it. Further, the lower plate can be positioned by the flange on the upper plate side, which facilitates manufacturing.

According to the fourth aspect of the present invention, since the cross-sectional modulus of the central upwardly projecting portion can be increased, the effect of preventing bending of the central portion can be increased.

According to the fifth aspect of the present invention, since the cross-section coefficient of the corner upwardly projecting portion can be increased, the effect of preventing the bending of that portion can be increased.

According to the sixth aspect of the invention, the wiring can be pulled out from the cutout portion, and the wiring work can be facilitated.

According to the invention of claim 7, since the edge of the cutout portion is eliminated, it is possible to protect the wiring when the wiring is pulled out from the cutout portion. Further, the bending structure can increase the effect of preventing the bending of the notch.

According to the eighth aspect of the present invention, it is possible to satisfy the strength performance while minimizing the cost and weight.

According to the ninth aspect of the present invention, the workability can be improved while the weight is reduced, and thereby the strength can be sufficiently increased.

According to the invention of claim 10, the upper plate and the lower plate can be reliably joined. Moreover, rust is less likely to occur at the joint, and the rigidity of the joint can be increased.

According to the eleventh aspect of the present invention, the upper plate and the lower plate can be joined by a simple work as compared with the compression press working, and the surface of the upper plate can be smoothed.

According to the twelfth aspect of the present invention, since rust can be prevented from occurring, there is no fear of strength reduction for a long period of time.

[Brief description of drawings]

FIG. 1 is a bottom view of a floor panel according to an embodiment of the present invention.

2A and 2B are cross-sectional views taken along arrows IIa-IIa in FIG.
b-IIb arrow sectional view, (c) is IIc arrow sectional view,
(D) is a IId arrow sectional drawing.

FIG. 3 is a cross-sectional view showing a configuration of a corner portion when a floor panel according to an embodiment of the present invention is placed on a floor surface via a support stand.

FIG. 4 is an enlarged cross-sectional view showing a configuration of a joint portion between an upper plate and a lower plate in the floor panel according to the embodiment of the present invention.

FIG. 5 is a bottom view of the floor panel showing where each measurement point is set in measuring the displacement amount when a load is applied to the floor panel according to the embodiment of the present invention.

6A and 6B are cross-sectional views taken along arrows of FIG. 1 showing where measurement points are set, where FIG. 6A is a VIa arrow view and FIG. 6B is a VIb arrow view.

FIG. 7 is a diagram showing a result of measuring a difference in displacement amount under load action of a floor panel of a conventional example and an embodiment of the present invention, (a) is an explanatory diagram showing a position of a measured cross section, b)
Is a diagram showing the relationship between the measurement point and the displacement amount in the A section,
(C) is a figure which shows the relationship between the measurement point and displacement amount in B cross section, (d) is a figure which shows the relationship between the measurement point and displacement amount in C section.

8A and 8B are cross-sectional views showing a difference between a state before displacement and a state after displacement in a cross section A shown in FIG. 7, where FIG. 8A is a comparative example and FIG.

FIG. 9 is a bottom view of a floor panel according to another embodiment of the present invention.

FIG. 10 shows an example of a conventional floor panel, (a) is a bottom view of this floor panel, and (b) is a sectional view taken along line Xb-Xb.

[Explanation of symbols]

 21 floor panel 22 upper plate 23 lower plate 23a corner portion 24 peripheral annular downward projection portion 24a corner portion 25 radial downward projection portion 25a base end side confluence portion 25b confluence portion 26 attachment holding portion 27 center upward projection portion 27a bottom wall 27b inclined wall 28 Middle upward protruding portion 28a Bottom wall 28b Sloping wall 30 Corner upward protruding portion 30a Bottom wall 30b Sloping wall 31 Flange portion 33 Flange 52 Cable lead-out portion (notch portion) 100 Joint portion 121 Floor panel 127 Center upward protruding portion 127a Bottom wall 127b Inclined wall 130 Corner upward protrusion 130a Bottom wall 130b Inclined wall

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[Procedure amendment]

[Submission date] October 6, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 3]

[Figure 4]

FIG.

[Fig. 2]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

[Figure 10]

Claims (12)

[Claims] 1. A polygonal flat plate-shaped upper plate and a lower plate having an outer peripheral edge having substantially the same contour as that of the upper plate and arranged below the upper plate. A flange portion that projects upward and has a predetermined width, and has a substantially annular flange portion along an outer peripheral edge; and a downwardly projecting peripheral edge annular downward projection portion that projects downward and is formed in a substantially annular shape inside the flange portion, The base ends merge with each other at the center of the plate surface of the lower plate, and extend radially from the base-side joining part toward each corner part of the outer peripheral edge, and each tip has each corner part of the peripheral annular downward protruding part. Downward projection-shaped radial downward projections that merge with each other, upwardly projecting center upward projections disposed at the base end side confluence of the radial downward projections, the peripheral annular downward projections and radial downward projections The shape of both downward protrusions in the part surrounded by and An intermediate upward protrusion protruding upward with a shape substantially corresponding to the above, each bottom wall of the central upward protrusion and the intermediate upward protrusion formed on the lower plate, and the outer peripheral edge of the lower plate are The upper plate and the lower plate are integrated by being brought into contact with and joined to the lower surface of the plate, and the inner side of the attachment holding part of the confluent part of the radial downward protrusion and the peripheral annular downward protrusion is A corner upward protrusion protruding upward is disposed at a position, the bottom wall of the corner upward protrusion is brought into contact with the lower surface of the upper plate to join the corner upward protrusion, the central upward protrusion, the intermediate upward protrusion, The side walls of the corner upward protrusions are formed by inclined walls so that the cross sections of these upward protrusions are open downward, and the middle upward protrusion inclined wall and the center upward protrusion inclined wall and / Or the above Floor panel characterized by intersecting the inclined wall of the upward protruding portion with each other while approaching each other or in the middle of the height direction. 2. The floor panel according to claim 1, wherein the inclined wall of the intermediate upward protruding portion, the inclined wall of the corner upward protruding portion and / or the inclined wall of the central upward protruding portion are in contact with each other. A floor panel characterized by being formed. 3. The floor panel according to claim 1, wherein a flange bent downward is formed on the outer peripheral edge of the upper plate, and the outer peripheral edge of the lower plate is arranged inside the flange. A floor panel featuring. 4. The floor panel according to claim 1, wherein the central upward projection is formed in a substantially hemispherical shape or a truncated cone shape. 5. The floor panel according to claim 1, wherein the corner upward protrusion is formed in a substantially hemispherical shape or a truncated cone shape. 6. The floor panel according to any one of claims 1 to 5, wherein a cutout portion is provided in a part of the outer peripheral edge of the panel body excluding a corner portion. 7. The floor panel according to claim 6, wherein the outer peripheral edge of the upper plate is folded back from the lower side toward the inner side at the cutout portion to cover the outer peripheral edge of the lower plate. Floor panel to be. 8. The floor panel according to claim 1, wherein both the upper plate and the lower plate are steel plates having a thickness of 0.8 mm to 1.5 mm. . 9. The floor panel according to claim 1, wherein the lower plate is set to have a smaller thickness than the upper plate. 10. The floor panel according to claim 1, wherein the upper plate and the lower plate are joined to each other by biting part of the upper plate into the inside of the lower plate. The floor panel that is characterized by 11. The floor panel according to any one of claims 1 to 9, wherein the upper plate and the lower plate are joined to each other by welding. 12. The floor panel according to any one of claims 1 to 11, wherein both the upper plate and the lower plate are made of a rustproof steel plate.