JP3450044B2 - Steel floor panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved steel floor panel used as a floor material for a free access floor.

[0002]

2. Description of the Related Art In OA offices, floor loads are 200 kg to 500 kg / sheet due to heavy objects such as computers.
Steel floor panels are used as the floor material for the free access floor (about 500 x 500 mm). Conventional steel floor panels generally have a hollow structure made by welding and clinching steel plates, and their weight is about the same as aluminum.
It was about half as strong as concrete, but it was strong and had little bending.

[0003]

Steel floor panels having a welded joint structure must be multi-point welded or long arc welded in order to achieve both weight reduction and strength due to the hollow structure. However, since this welding involves thermal strain, it is essential to remove the strain as a post-process, but the strain cannot be completely removed. In addition, oxidation of the welded portion required rust prevention treatment after welding, but painting the floor panel hollow inner surface after welding is difficult, and eventually results in problems in corrosion resistance, and these problems reduce productivity. Was also greatly affected.

Further, in the conventional steel floor panel, as in Japanese Patent Application No. 58-22130, for example, the cut end face of the steel plate is exposed on the side surface of the floor panel, and there is a risk of injuring an operator. . Therefore, the present applicant has filed Japanese Patent Publication No. 3-247857 and Japanese Patent Application No.
No. 3-25464 proposes a steel floor panel with a joint structure by pressure fastening.

In the press-fastening structure, as shown in the sectional view of FIG. 7, for example, the upper surface of the supporting column 10 of the bottom plate 9 is opened, and the standing portion of the top plate 8 is inserted into the hole of the supporting column. Some are fitted, rolled in, and pressure-bonded. This structure has the advantage that it is strong against omission and that the finished product can be inspected from the outside. However, top plate 8 and bottom plate 9
A large number of holes and support pillars are separately molded, and processed and inserted into
In order to connect, a gap 14 is inevitably formed in the press-fastened part (see FIG. 7).
When a person walks, a lateral shift occurs in the gap 14 to make an abnormal noise, and the strength is reduced.

As another structure, as shown in the sectional view of FIG. 8, the top plate 8 and the bottom plate 9 are overlapped with each other to form a coupling projection 11, and the head is enlarged and rolled to be rolled up. Some are pressure-fastened. In this structure, lateral displacement is less likely to occur than that in FIG. 7, but the plate pressure at the connecting convex portion 11 is thin and the amount of entrainment cannot be increased, so the member separates from the connecting convex portion 11 during use ( Figure 8
There is a risk of quality control because there is a risk and it is difficult to inspect the fastening state from the appearance of the finished product.

In addition, as shown in the cross-sectional view of FIG. 9, in order to increase the coupling strength in a flange 12 that covers almost the entire outer circumference of the top plate 8 or the bottom plate 9 and covers one with the other and is pressure-fastened. The applicant has also proposed a structure in which the convex portion 13 is provided on the bottom. However, even in this case, the lateral displacement (see FIG. 9) occurs due to the gap 14, and the same problem as that shown in FIG. 7 occurs.

[0008] Therefore, in the steel floor panel, the problems of distortion and oxidation due to bonding in the manufacturing process are solved, and the inspection from the appearance after the manufacturing can be easily performed to improve the productivity. We also studied to develop a joint structure of steel plates that does not cause abnormal noise or strength deterioration due to lateral displacement between members.

[0009]

[Means for Solving the Problems] As a result, what has been developed is a top plate 1 and a bottom plate 2 made of steel plates.
In the steel floor panel, which is formed by superposing and pressure-bonding with each other, the steel floor panel is provided with a cut step portion formed by meshing with the contact portion of the plate. The notch step is the state in which the top plate and the bottom plate are overlapped.
It refers to the ones that are meshed with each other by molding them at the same time.

A concrete plate-to-plate coupling structure is one in which the stepped portions 4 and 6 formed by meshing are provided at the contact portions of the flanges 3 provided on the outer periphery of each plate,
For example, there is one in which a notch step portion 7 formed by meshing is provided at a contact portion near the support column 5 provided on the inner surface of one of the plates.

The cut step portion may have any shape as long as it does not project from the top surface of the floor panel, but it is preferable that the projecting amount of the cut step portion is at least one plate thickness or more, and the entire cut step portion. The ratio of the area occupied by the plate should be as small as possible. Further, it is preferable that the number of cut step portions and the arrangement thereof are arranged as close to the pressure-fastened portion as possible in consideration of the coupling strength between the plates. It is advisable to form such a cut step portion at the same time during the press work for press-fastening the top plate and the bottom plate.

[0012]

The steel floor panel of the present invention avoids problems caused by welding by pressing the top plate 1 and the bottom plate 2 forming the floor panel to each other, and at the contact portion of both plates. Interlock molding, specifically, by providing the cut step portions 4 and 6 on the flange 3 and the cut step portion 7 in the vicinity of the support column 5, it is possible to prevent lateral displacement that occurs when pressure fastening is used. . These cut steps 4, 6, 7 can be inspected with the naked eye from the outside.

The cut step portions 4, 6, 7 formed by meshing are
It is a kind of pressure fastening performed in a state where the top plate 1 and the bottom plate 2 are in close contact with each other, and is formed by extruding a part of the contact portion of both plates toward one plate with a predetermined mold. The extruded notch portion presses the notch cross sections of both the plates and functions as a stopper, while the plates tend to be laterally displaced. In addition, the notched portion is rolled during processing to widen the width, and the notched portion and one plate are closely contacted so as to sandwich the other plate,
As a kind of pressure fastening, it also has an auxiliary role of joining plates together.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of this embodiment, FIG. 2 is a front view of the same, and FIG. 3 is an enlarged sectional view taken along line AA in FIG. The present embodiment is a steel floor panel having a hollow structure in which the top plate 1 and the bottom plate 2 are pressure-fastened and joined to each other at the opening portions of the flange 3 and the support column 5 similar to the conventional one, and are seen in FIG. As shown in the drawing, at the outer edge of the flange 3 or the inner edge of the opening portion of the support column 5, the portion in which the top plate 1 is covered with the bottom plate 2 is folded back, and pressure fastening is performed by press working. The hollow portion in the panel can be filled with concrete or the like, or the damping material 51 can be attached.

In FIG. 1, the U-shaped, cruciform, or semicircular cut-out portions seen in the vicinity of the opening portion of the flange 3 or the support column 5 in the drawing are cut step portions 4, 6, respectively.
Alternatively, the cut step portion 7 is provided. These cut step portions 4, 6, 7 are
As shown in FIG. 3, one side of the rectangular section is left, and the side opposite to the remaining one side is extruded from the top plate 1 side to the bottom plate 2 side to perform mesh formation. The cut step portions 4, 6 and 7 can be formed by pressing, and are formed at the same time as the normal pressure fastening for connecting the plates or in a later step.

FIG. 4 (a) is a notch step portion 4 of the flange 3 in FIG.
FIG. 4 is an enlarged cross-sectional view taken along the line BB in FIG. 1, and FIG.
It is a middle P arrow broken perspective view. The cut step portion 4 cuts such that the upper surface of the extruded top plate 1 is substantially aligned with the lower surface of the bottom plate 2, and the top plate 1 and the bottom plate 2 extruded during the forming process.
The section of is flat and will not be pushed back by an external impact. Since the width of the cut step portion 4 is widened by rolling at the time of forming, it functions as a kind of pressure fastening.

In principle, the shape of the cut step portion is free.
Therefore, the flange 3 is formed with a cross-shaped cut step 6 having a shape different from that of the cut step 4, together with the cut step 4. 5 is an enlarged sectional view taken along line CC in FIG. 1 of the cut step portion 6 of the flange 3 in FIG. This cross-shaped notch 6
Compared to the notch step 4, the deformed part due to molding is vertical and horizontal 2
The number of directions is increased, and the function of preventing lateral shift is improved.

FIG. 6 is a sectional view taken along the line DD in FIG. 1, showing the cut step portion 7 provided in the vicinity of the opening of the support column 5. Since the purpose of the cut step portion is to prevent lateral slippage, it is better to provide the cut step portions 4 and 7 as close as possible to the pressure-fastened portion where lateral slippage is a problem. Therefore, in this embodiment, four notch step portions 7 are provided in the crosswise direction around the support column 5 as well.

The provision of the cut step portion in the plate causes a cutout in the plate, that is, the strength of the plate is reduced, and therefore a small one is preferable. Therefore, the cut step portion 7 has a small semicircular shape and is symmetrically arranged so that the stress is equally divided around the support column 5. Cut step 6,7
With regard to the above, since it is provided on the flange 3 having a large contact area between the top plate 1 and the bottom plate 2, it can be made larger than the cut step portion 7.

[0020]

The steel floor panel of the present invention prevents lateral slippage, and as a result, it becomes possible to adopt pressure fastening as a means of joining with a sense of security and to avoid the occurrence of thermal strain associated with welding. The strength of the floor panel can be increased, and problems such as oxidation due to welding can be avoided.For example, even if a steel sheet that has been surface treated is processed into a floor panel, there is no need for post-treatment. The labor in the manufacturing process can be reduced and the production efficiency itself can be improved.

Further, the lateral shift, which has been a problem in the conventional pressure-fastened floor panel, is prevented by the notch step portion. The cut step portion and, of course, the pressure-fastened portion can be visually inspected from both the top plate side and the bottom plate side of the floor panel, so that the quality inspection at the time of product completion can be easily performed. Therefore, according to the present invention, it is possible to provide a floor panel that does not generate abnormal noise due to squeaking for a long period of time and exhibits excellent load bearing performance.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged cross-sectional view taken along the line AA in FIG.

4 (a) is a sectional view taken along line BB in FIG. 1, and FIG. 4 (b) is a perspective perspective view taken along line P in FIG.

FIG. 5 is an enlarged view of the cut step portion of the flange portion in FIG.
FIG.

FIG. 6 is an enlarged view of the notch step near the support pillar, which is taken along line DD in FIG.
FIG.

FIG. 7 is a cross-sectional view of Conventional Example 1.

FIG. 8 is a sectional view of Conventional Example 2.

9 is a sectional view of Conventional Example 3. FIG.

[Explanation of symbols]

1 top plate 2 bottom plate 3 flange 4 notch step 5 support pillars 6 notch step 7 Notch step

Continuation of the front page (56) References JP-A-3-247857 (JP, A) JP-A-4-166552 (JP, A) JP-A-59-55952 (JP, A) Actual Kaihei 6-10479 (JP , U) Actually open 63-116644 (JP, U) Actually open 6-10480 (JP, U) Actually open 45-12133 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) E04F 15/024 E04F 15/06

Claims (3)

(57) [Claims] 1. A superposing two sheets of the top plate 1 and bottom plate 2 formed of steel plate, the steel floor panels formed by the engagement pressure, the one contact portion of the two plates
A steel floor panel that is provided with notch steps that are pushed toward the plate and mesh with each other without gaps . 2. The steel floor panel according to claim 1, wherein the cut step portions are cut step portions 4 and 6 formed by meshing formation provided at the contact portions of the flanges 3 provided on the outer circumferences of the two plates. . 3. A notch step portion, by meshing molding provided on the contact portion in the vicinity of the support post 5 in the inner surface of one of the plate out of two is a cut step portion 7 according to claim 1, wherein the steel Floor panel.