JPH08109733A - Work execution for steel-made free access floor, and steel-made floor panel for heavy load - Google Patents

Abstract

PURPOSE: To easily, speedily and economically construct a high quality free access floor by making a floor panel for a heavy load by way of laminating an iron plate for reinforcement on a lower surface of a floor panel for a light load. CONSTITUTION: A steel made floor panel 3 for a light load composited by laminating a flat upper iron plate 30 and a lower iron plate 31 having a plural number of dome type projections 8... is set on supports 2, 2 of a light load floor zone cut of a free access floor 6. Additionally, a steel made floor panel 5 for a heavy load composited in a state free to transmit tensile force by laminating a flat iron plate 4 for reinforcement on a lower surface 31a... of the lower iron plate 31 of the floor panel 3 for the light load is set on the support 2 of a heavy load floor zone. Thickness of the floor panel 3 for the light load and the floor panel 5 for the heavy load at portions to set them on the support 2 is formed same. Consequently, specifications for the floor panels 3, 5 for the heavy load and the light load become almost common, and treatment of height adjustment becomes unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for forming a steel free access floor having a double floor structure in which wiring of OA equipment in an office building or the like is laid under the floor. A steel free access floor consisting of a heavy-duty floor zone where heavy items such as bookshelves, bookshelves, and storage shelves are placed, and a light-load floor zone where a desk with a personal computer installed on a desk is placed are almost common. The present invention relates to a construction method in which steel floor panels having specifications are selectively used so that the zones are not distinguished from each other in appearance and substantially, and a steel floor panel for heavy load used in the method.

[0002]

2. Description of the Related Art A so-called double floor structure is used as a measure to prevent unsightly wiring of many OA equipment used in offices, computer rooms, etc. Has already been filed for many applications (refer to the structure of the floor panel for double floors described in JP-A-5-272228).

As shown in FIG. 6B, a general steel free access floor has a plurality of columns 2 installed on a concrete slab 1, and a rectangular steel floor panel 3 (see FIG. (See 7) Each of the four corners is supported, and finally the entire floor is laid, and a double floor is constructed in which the wiring of OA equipment and others can be laid in the underfloor space. As the steel floor panel 3, as shown in FIG. 6A, a steel floor panel obtained by laminating a planar upper iron plate 30 and a lower iron plate 31 having a plurality of aligned dome-shaped protrusions 8 to form a composite. 3 is used. In this steel floor panel 3, the dome-shaped protrusion 8 of the lower iron plate 31 produces a kind of truss effect, and exhibits excellent bending rigidity.

[0004]

The conventional steel floor panel 3 shown in FIG. 6A can withstand the load (up to about 180 kg / m ² ) of lightweight objects such as general office automation equipment and desks, but is large in size. Load of heavy objects such as computers (about 500k
g / m ² ). Therefore, in the heavy load floor zone, a steel floor panel for heavy load, in which the thickness of the iron plate and the thickness of the panel are increased, is separately prepared and constructed so as to withstand the load of loading a heavy load. For example,
The thickness of the steel floor panel for light loads is 20 to 25 mm, while the thickness of the steel floor panel for heavy loads is 30 to 42.
It also becomes mm. Therefore, when using columns of the same height in common, if the light load steel floor panel and heavy load steel floor panel with different thicknesses (heights) are laid on one side as described above, the finished steel There is a step on the free access floor, which is dangerous for walking and is inconvenient. In order to adjust the height according to the height of the steel floor panel for heavy loads, the work of interposing a support plate or the like between the receiving plate 2a of the column 2 and the steel floor panel 3 for light load is troublesome and troublesome. However, there is a risk that the support state will be unstable and wobble, which is also a problem. However, considering the heavy items to be placed on the free access floor, it is very costly and uneconomical to lay all the heavy-duty steel floor panels in consideration of the heavy objects placed on the free access floor. The point is a problem.

Therefore, it is an object of the present invention to use a steel floor panel having almost the same specifications for a free access floor consisting of a heavy load floor zone and a light load floor zone so that the zones are not distinguished from each other. It is intended to provide a method for constructing a formed high quality steel free access floor simply, quickly and economically, and a heavy load steel floor panel suitably used for the method.

[0006]

[Means for Solving the Problems] As a means for solving the above-mentioned problems, in a method for constructing a steel free access floor according to the invention of claim 1, a plurality of columns 2 are installed on a concrete slab 1. In the construction method of the steel free access floor 6 in which the four corners of each steel floor panel are supported on each of the columns 2 and the two floors are spread over one surface to form a double floor, in the free access floor 6, a lightweight object is mounted. A steel floor for light load formed by laminating and combining a flat upper iron plate 30 and a lower iron plate 31 having a plurality of dome-shaped protrusions 8 on the pillar 2 of the light load floor zone S to be placed. Install panel 3. On the pillar 2 of the heavy load floor zone L on which a heavy load is placed, a flat reinforcing iron plate 4 is attached to the lower surface of the lower iron plate 31 of the light load steel floor panel 3 described above. Installation of a steel floor panel 5 for heavy load, which is composited in a state where transmission is possible, and each of the parts installed on the columns 2 of the steel floor panel 3 for light load and the steel floor panel 5 for heavy load. The steel floor panels 3 and 5 are formed to have the same thickness.

The steel floor panel for heavy load according to the invention of claim 2 is a free access floor in which a plurality of pillars 2 are installed on a concrete slab 1, and four corners are supported on each pillar 2 and spread over one surface. In the steel floor panel forming the above, the steel floor panel includes a flat upper iron plate 30 and a lower iron plate 31 having a plurality of dome-shaped protrusions 8 ... It is characterized in that they are bonded so as to be in contact with each other to form a composite, and further, a planar reinforcing iron plate 4 is adhered to the lower surface of the lower iron plate 31 so that the tension can be transmitted.

The steel floor panel for heavy loads according to claim 2 is
It is characterized in that the reinforcing iron plate 5 is formed to have a plate thickness of at least 0.5 mm. The heavy-duty steel floor panel of claim 2 is also characterized in that the outer peripheral edge of the reinforcing iron plate 4 is folded back along the circumferential surface of the lower iron plate 31, or each corner portion is cut off.

Further, in the upper iron plate 30 of the steel floor panel for heavy loads according to claim 2, the plate thickness t ₁ is calculated by the following equation: t ₁ = t ₀ × (L ₁ / L ₀ ) ^1/3 (where t ₀ is It is also characterized in that the thickness of a normal upper iron plate, L ₁ is a rolling load for heavy load, and L ₀ is a rolling load for light load.

[0010]

The steel floor panel 5 for heavy load having a structure in which a thin reinforcing iron plate 4 having a thickness of about 0.5 mm is joined to the back surface of the floor panel 3 for light load steel shown in FIG.
(Fig. 1A) is a light steel floor panel 3 (Fig. 6A).
Since it is used together with the above, the upper surfaces of both steel floor panels 5 and 3 installed on the common support 2 are at the same level, and the underfloor space is also secured (FIG. 1B). Therefore, with regard to the installation of the two types of steel floor panels, since no height adjustment is necessary, the labor of construction can be saved, and all the columns 2 can be used in common. Further, the light load floor zone L and the heavy load floor zone H are distinguished from each other by two types of steel floor panels 3,
It can be dealt with only by properly using 5. Therefore, zone setting and modification can be easily performed at any time.

Since the reinforcing iron plate 4 of the heavy-duty steel floor panel 5 is joined to the lower surface of the lower iron plate 31 having a plurality of dome-shaped protrusions 8, the pulling member corresponding to the lower chord member of the truss frame as a whole. Then (FIG. 1), the bending tensile force generated by the applied load applied to the upper iron plate 30 is effectively borne by the reinforcing iron plate 4 concerned. Incidentally, the result of the test for confirming the function of the reinforcing iron plate 4 used for the heavy-duty steel floor panel 5 is shown in the graph of FIG. FIG. 5A shows a case where the applied load is applied to the center of the floor panel, and FIG. 5B shows a case where the applied load is applied to the center of the outer periphery of the floor panel. The heavy-duty steel floor panel 5 used in the test is formed by laminating a flat upper iron plate 30 and a lower iron plate 31 having dome-shaped protrusions 8, and further laminating a reinforcing iron plate 4 on the lower surface of the lower iron plate 31. It is composited into a state in which tension can be transmitted. The upper iron plate 30 is formed in a rectangular shape with one side of 500 mm, the plate thickness is 1.8 mm, and the load capacity is 300 k.
It is a gf steel plate. As the reinforcing iron plate 4, the plate thickness is
Three types of 0.3 mm, 0.5 mm, and 0.8 mm were used, and the respective test results are shown by reference characters a, b, and c in FIG. Reference numeral d indicates a data value of the so-called light load steel floor panel 3 without the reinforcing iron plate 4. According to this test result, the allowable load P for heavy load P = 500 kgf is cleared at the allowable deflection amount δ = 2.5 mm, because all of a, b, and c in FIG. 5A, b in FIG. Since it is c, b and c satisfy both conditions. That is, it can be seen that the reinforcing iron plate 4 satisfying the load-bearing performance required for the heavy-duty steel floor panel 5 has a plate thickness of at least 0.5 mm (b in the figure).

[0012]

EXAMPLE An example of the present invention shown in the drawings will be described below.
FIG. 1 shows a steel floor panel 5 for heavy objects used for construction of a steel free access floor 6 from a side direction. This heavy load steel floor panel 5 is basically used in combination with the light load steel floor panel 3 shown in FIG. 6A. As shown in FIG. 3, the steel free-access floor 6 has columns 2 on the concrete slab 1 at each vertex of a square that is the same as the plane shape of the floor panel and at least a floor height of 50 mm can be secured. They are installed one by one, and the four corners of the steel floor panel 5 (or the steel floor panel 3 in FIG. 6) are supported on the support plate 2a of the pillar 2 and spread over the entire floor, and wiring is provided under the floor. A double floor is formed with a space used for such purposes.

The structure of the heavy load steel floor panel 5 is basically the same as the structure of the light load steel floor panel 3 (see FIG. 6A), and the thickness of the surface-treated epoxy coating is
A rectangular flat upper iron plate 30 (see FIG. 2A) having a length of 1.6 mm and a side length of 500 mm is bonded to a so-called embossed lower iron plate 31 to form a composite structure (FIG. 1A). . The embossing is performed by arranging 37 dome-shaped protrusions 8 ... In a diagonal line in order to enhance the strength. Each dome-shaped protrusion 8 is φ = 56 and the height is about 1
It is formed to 7 mm. The upper iron plate 30 and the lower iron plate 31
Means that the top of the dome-shaped protrusion 8 is brought into contact with the lower surface of the upper iron plate 30 and joined by spot welding to form an overall thickness of 20 mm, and the proof stress at an allowable deflection amount δ = 2.5 mm is 300 kgf. It is made to clear.

In the heavy-duty steel floor panel 5, a flat reinforcing iron plate 4 for further strengthening is joined to the lower surface of the lower iron plate 31. The overall size of the reinforcing iron plate 4 is approximately the same as the lower iron plate 31. In the reinforcing iron plate 4, each corner portion to be placed on the receiving plate 2a of the column 2 is cut out as shown in FIG. 2A. The effective thickness of the floor panel 5 made of steel for heavy load (the size of the floor panel at the portion of the supporting column 2 on the support plate 2a) is set to the floor panel 3 made of steel for light load.
This is to make it the same as that of. However, when the size of the reinforcing iron plate 4 is for the purpose of increasing the load bearing performance of the steel floor panel 5, the reinforcing iron plate 4 may have a size and shape that can be seen in a part of the lower iron plate 31. It The reinforcing iron plate 4 is also formed of a surface-treated coated steel plate. A polyester coated steel sheet is preferably used as the surface treatment. The reinforcing iron plate 4 is formed by applying an adhesive to the entire lower surface 31a of the lower iron plate 31 excluding the dome-shaped protrusions 8 and compounding them so that the bonding tension can be transmitted. As the adhesive, a completely curable thermosetting resin such as an epoxy adhesive is preferably used. At the time of joining, as shown on the left and right of FIG. 1A, since the outer peripheral edge of the reinforcing iron plate 4 is folded back to the upward folding portion 4a along the peripheral side surface of the lower iron plate 31, the outer periphery of the reinforcing iron plate 4 is bent. There is no risk of the adhesive leaking out. Further, the reinforcing iron plate 4 is formed to have a thickness of at least 0.5 mm (preferably 0.8 mm) so as to exhibit a strength enough to withstand the loading of a heavy load (withstand load = 500 kgf) such as a large computer. ing. Board thickness is 0.8m
In case of m, the applied load is 580 to 600 kgf (deflection amount δ
= 2.5 mm).

Note that FIG. 2A shows the normally used steel floor panel 5 for heavy load having the above-mentioned structure from the lower surface direction, but FIG. 2B shows each of the upper iron plate 30, the lower iron plate 31, and the reinforcing iron plate 4. The lower surface of the floor panel 5 made of steel for heavy goods having openings 7 for drawing out cables of OA equipment or the like at common positions (two locations) on the outer periphery is shown. Therefore, by using the steel floor panel 5 for heavy load described above together with the steel floor panel 3 for light load, the steel free access floor including the heavy load floor zone H and the light load floor zone L as shown in FIG. 6 is simple and quick to construct. That is, in the free-load floor 6, most of the light-load floor zones L on which light-weight objects are placed and people, equipment, etc. move, are provided in the existing light-load steel shown in FIGS. 6 and 7. Lay out the floor panels 3 made of steel. On the other hand, in the heavy load floor zone H in which a heavy load such as a large computer is placed, only in that portion, a heavy load steel in which a reinforcing iron plate 4 is joined to the back surface of the light load steel floor panel 3 having the above-mentioned configuration Lay out the floor panels 5 made of materials. In this state, the respective thicknesses of the portions of the floor panels 3 and 5 to be installed on the columns 2 are formed to be the same, and thus the upper surfaces are at the same level (see FIG. 1B), so that no step is generated. Safe and easy to use. Also,
Since the underfloor space is sufficiently secured, wiring can be laid easily. In the heavy-duty steel floor panel 5, the reinforcing iron plate 4 as a whole serves as a tensile member corresponding to the lower chord member of the truss frame, and the bending tensile force generated by the applied load applied to the upper iron plate 30 is the reinforcing iron plate 4 concerned. But bear and bear. As shown in FIG. 3, when the steel floor panel 5 having the opening portion 7 of FIG. 2B is used, the electric wire outlet cover 10 is attached to the opening portion 7 to close it. Finally, a surface finish material 9 such as a tile carpet is laid on each steel floor panel 3, 5 to complete the double floor steel free access floor 6 (see FIG. 1B). Therefore,
When the layout of the room is changed due to the placement of a new large computer or the movement of the office automation equipment, for example, the light load floor zone indicated by reference signs L ₁ and L ₂ in FIG. When used as, there is the flexibility to adapt flexibly by simply exchanging the positions of the light load steel floor panel 3 and the heavy load steel floor panel 5 already installed as described above.

In order to increase the rigidity of the steel floor panel 5 for heavy load described above, that is, the rolling load performance of the portion not reinforced by the dome-shaped protrusions 8 is locally reduced to 0.
In order to reduce the thickness to 3 mm or less, the upper iron plate 30 used for the steel floor panel 5 may be slightly thickened. Here, if the desired thickness of the upper iron plate 30 is t ₁ , the plate thickness of a normal upper iron plate is t ₀ , the rolling load for light load is L ₀ , and the rolling load for heavy load is L ₁ , the following equation (1) t ₁ / t ₀ ) ³ × L ₀ = L ₁ (formula) is modified to obtain t ₁ = t ₀ × (L ₁ / L ₀ ) ^1/3 (formula). For example, in the formula, t ₀ = 1.6 mm, L ₁ = 500 kg
Substituting f, L ₀ = 300 kgf, t ₁ Is about 1.9
mm. Therefore, the plate thickness of the upper iron plate 30 is 1.9 mm.
By carrying out with the heavy-duty steel floor panel 5 (preferably 2.0 mm) or more, not only the overall strength,
The high-quality steel free access floor 6 with locally enhanced strength is constructed at low cost.

[0017]

According to the method for constructing a steel free access floor according to the invention of claim 1 and the steel floor panel for heavy load according to the inventions of claims 2 to 6, the steel having almost the same specifications is used. Contributes to the simple and quick construction of the steel free access floor 6 formed so that the distinction between the heavy load floor zone H and the light load floor zone L does not occur visually or practically only by using the floor panels 3 and 5 properly. To do. that time,
No height adjustment is required, and construction is done only in the floor panel zone with common specifications, which greatly contributes to the reduction of manufacturing costs. Further, since the light load floor zone L and the heavy load floor zone H can be easily modified, the layout of the room can be easily changed and the office can be used for multiple purposes.

[Brief description of drawings]

1A is a cross-sectional view of a steel floor panel for heavy load shown by an arrow I-I in FIG. 2A, and B is a partially cut-away side view showing an installation state of the steel floor panel for heavy load.

2A and 2B are back views showing a heavy-duty steel floor panel.

FIG. 3 is a perspective view partially showing a steel free access floor.

FIG. 4 is a schematic view showing a layout of a steel free access floor.

5A and 5B are graphs showing a proof stress test result of a reinforcing iron plate.

6 is an end view of the steel floor panel for light loads shown by the arrow II-II in FIG. 7, and FIG. 6B is a partially cutaway side view showing the installation state of the steel floor panel for light loads. is there.

FIG. 7 is a back view showing a steel floor panel for light load.

[Explanation of symbols]

 1 Concrete slab 2 Strut 3 Steel floor panel for light load 30 Upper iron plate 31 Lower iron plate 31a Lower surface 4 Reinforcing iron plate 4a Folding part 5 Steel floor panel for heavy load 6 Free access floor 7 Opening 8 Dome-shaped protrusion L Light load Floor zone H Heavy load floor zone

Claims (6)

[Claims] 1. A method for constructing a steel free access floor, comprising a plurality of columns mounted on a concrete slab, and the four corners of each steel floor panel supported on each column to be spread over one surface to form a double floor. Among the free access floors, a light load floor zone, on which a lightweight object is placed, is mounted on a support column with a flat upper iron plate and a lower iron plate having a plurality of dome-shaped protrusions to form a light composite. Installing steel floor panels for load,
On the pillar of the heavy load floor zone where heavy objects are placed, a flat reinforcing iron plate is attached to the lower surface of the lower iron plate of the light load steel floor panel so that tension can be transmitted. Install a composite steel floor panel for heavy loads, and make the thickness of each steel floor panel the same for the parts to be installed on the columns of the steel floor panel for light loads and the steel floor panel for heavy loads. A method for constructing a steel free access floor, characterized by being formed. 2. A steel floor panel in which a plurality of columns are installed on a concrete slab, and four corners are supported on each column to lay one surface to form a free access floor, wherein the steel floor panel has a planar shape. An upper iron plate and a lower iron plate having a plurality of dome-shaped protrusions are bonded together so that the tops of the dome-shaped protrusions come into contact with the upper iron plate, and are compounded, and the lower surface of the lower iron plate is reinforced in a planar manner. A steel floor panel for heavy-duty use, characterized in that it is compounded in such a manner that it can be bonded with steel plates for transmission of tension. 3. A steel floor panel for heavy loads, wherein the reinforcing iron plate according to claim 2 has a plate thickness of at least 0.5 mm. 4. A steel floor panel for heavy load, wherein the reinforcing iron plate according to claim 2 has an outer peripheral edge folded back along a peripheral side surface of the lower iron plate. 5. The steel floor panel for heavy load, wherein the reinforcing iron plate according to claim 2 has each corner cut off. 6. The upper iron plate according to claim 2, wherein the plate thickness t ₁ is the following formula t ₁ = t ₀ × (L ₁ / L ₀ ) ^1/3 (where t ₀ is a plate of an ordinary upper iron plate). Thickness, L ₁ is a rolling load for heavy loads, and L ₀ is a rolling load for light loads), which is a steel floor panel for heavy loads.