JPH0572498B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a double floor floor plate.

[Conventional technology]

Various types of double floors are used to enable wiring under the floor, but most are cement-based or
Many are made of aluminum or wood, and only a few are made of steel plates.

[Problem that the invention seeks to solve]

Steel plates are preferable because they are easy to process, nonflammable, lightweight despite their high strength, and low cost.

However, if the leg span of a steel plate is large, the steel plate will flex significantly, making it unsuitable for use as a floorboard.

This invention solves the drawbacks of such steel plates,
It is intended to provide a structural floorboard.

[Means to solve problems]

For this purpose, in the present invention, a steel plate is bent to form a C-beam. The width of this shaped steel web is made to be about 10 cm.

Such narrow C-beams are arranged in parallel and connected using a commonly used lattice method to form a composite floorboard.

Further, legs are attached below the connecting plate so as to lift the floorboard from the floor slab.

[Effect]

With this configuration, as shown in Figure 1,
Since the width of the web 11 of the C-shaped steel 1 is small, the in-plane deflection δ1 of the web when the force P is applied from above is
is small. For example, if a steel plate with a thickness of 2.3 mm is used, the width of the web is 10 cm, and the load P is 200 kg, the deflection δ1 is usually within 2 mm.

If the thickness of the steel plate is less than 2 mm, even if the width of the web is small, there is no local load bearing capacity, and the thickness is too small.
If the steel plate exceeds 3.2mm, the overall weight will be too heavy. From this point of view, the steel plate is preferably 2 to 3.2 mm. Moreover, at that thickness, especially when there is no other support, the width of the web is 50 to 150 mm, which is the limit for satisfying the above performance.

Furthermore, since the C-shaped steel is reinforced in the longitudinal direction by the flange 12, deflection can be suppressed. As shown in FIG. 2, if the width of the flange 12 is 40 mm and the distance between the supporting points m and n in the longitudinal direction is 50 cm, the deflection δ2 in the longitudinal direction is also within 2 mm under the same loading conditions. If the width of the flange is made too large, the thickness of the entire floor structure will increase.

The point 13 at the end of the web 11 of the C-shaped steel 1 shown in FIG.
If these are attached to both ends of the C-shaped steel, this point will also be reinforced and the amount of deflection of the steel floor plate will be resolved.

In order to use narrow C-shaped steel as the floorboard of a double floor, it is necessary to attach legs to each C-shaped steel, which is cumbersome due to the large number of legs.
The cost will also be higher. In this invention, since the narrow floorboards are gathered together by the connecting legs, the number of legs can be reduced, and this problem of troublesomeness and cost can be solved.

Furthermore, since the connecting leg acts as a support plate placed below the above-mentioned end point 13, the weakness at this point is also solved.

In addition, the narrow C-shaped steel and the connecting legs are assembled like a grid, so the assembled product is
This is convenient because they are interlocked with each other and cannot be easily removed.

〔Example〕

Hereinafter, embodiments of the present application will be described in detail based on the drawings.

What is shown in FIG. 4 is a C-beam 1 made of galvanized steel plate with a thickness of 2.3 mm. The width of web 11 is 10
cm, the width of the side flange 12 is 40 mm, and flange notches 15 of half the depth of the flange, that is, 20 mm, are provided at both ends of the flange.

What is shown in FIG. 5 is the connecting leg 2, and the connecting portion 2
1 and the leg portion 22 are integrally formed by pressing out a steel plate with a thickness of 3.2 mm.

The connecting portion has a total width of 30 cm, a height of approximately 40 mm, which is equal to the internal height of the C-shaped steel 1, and cuts 23 on the upper edge are provided at intervals of 10 cm, which is the same as the width of the C-shaped steel. The depth of the cut on the upper edge is 20 mm, which is half the width of the C-shaped steel flange 12, and the width of the cut is approximately the thickness of two C-shaped steel plates.
It is 4.6mm.

At both ends of the connecting portion, legs 22 are attached to protrude downward. The lower ends of the legs are bent to provide a bottom plate 24. A cushioning material may be attached to the back of the bottom plate.

FIG. 6 shows a floor plate 3 of the present invention formed by connecting the above C-shaped steels 1 with connecting legs 2. C
Four pieces of shaped steel 1 are arranged in parallel, and the notches 15 of the flanges are arranged in a straight line. The notch on the flange and the notch 23 on the upper edge of the connecting leg are inserted at right angles to each other. The interlocking parts may be joined using adhesive or welding, but if the width of the notch is formed accurately,
It is possible to securely fix it by driving the engagement.

As shown in FIG. 6, the area surrounded by the connecting legs and the floor slab 4 becomes the wiring space.

In addition, as shown in FIG.
When laid out on top of each other, the wiring space 5 is between the connecting legs in the longitudinal direction.

In this invention, the C-shaped steel 1 may be provided with a lip 16 as shown in FIG. Effective for increasing longitudinal strength when the flange width is short. The width of the flange can also be arbitrarily determined without being limited to the examples.

As a method for reinforcing the web 11 of C-shaped steel, the ninth
As shown in the figure, on the upper edge of the connecting leg, apart from the notch that engages with the flange of the C-section steel, there is a middle notch 2.
5 is provided, and reinforcing rods 26 are bridged over the intermediate cuts at both ends of the C-shaped steel in the longitudinal direction. By reinforcing in this way, the width of the web is increased. The number of intermediate cuts 25 does not need to be limited to one.

Further, in this invention, the method of attaching the legs is not limited to the embodiments. As in the embodiment, the connecting part 21 is extended to form the leg part 22, which is made of a single steel plate, but as shown in FIG. As shown, nuts 71 are attached to both ends of the connecting part 21,
A bolt leg 72 may be attached to this nut to enable height adjustment. In this case, an operating groove 73 is attached to the upper end of the bolt leg 72, an operating hole is provided in the C-beam directly above this, a screwdriver is inserted through the operating hole into the operating groove 73, and the bolt leg 72 is turned to adjust the height. It would be even more convenient to make it adjustable.

Further, although the legs are provided at both ends of the connecting portion, it is also possible to provide the legs at the center portion. It goes without saying that the connecting portions do not have to be limited to both ends of the C-shaped steel, and may be provided in the middle. When long C-shaped steel is used, it has a great effect in suppressing longitudinal deflection.

The planar size of the floor plate 3 of this invention is
It can be determined arbitrarily depending on the size of the shaped steel and the number of parallel steel sections, but as an example, if the width is 40 cm and the length is 60 cm,
When constructing this, it is common to simply lay them out in the same direction as shown in Figure 12.
As shown in Figure 3, it is possible to arrange the first row vertically, the second row horizontally, and then alternately horizontally and vertically. When constructed in this way, the module can be made 100cm long, and by removing the continuous floorboard in the longitudinal direction (13th
(distinguished by diagonal lines in the figure), grooves 40 cm wide can be formed in a vertical and horizontal lattice pattern. Since this is a place where many desks, chairs, and equipment are arranged on the floor, it is desirable that the width of opening the floorboards be as narrow as possible. In that sense, a 40cm wide trench is convenient for wiring work.

This kind of arrangement can also be made into a 90cm module using floorboards that are 30cm wide and 60cm long.
It is also possible to make 100 modules using a 25 x 75 cm floorboard.

Furthermore, the same effect can be expected in that the grooves on the lattice are formed even if the vertical and horizontal lines are not arranged alternately in every row, but are connected vertically in places as shown in FIG.

〔effect〕

Since the present invention is configured as described above, the following effects can be obtained.

By combining the C-shaped steel and the connecting legs, it is possible to realize a double floor steel floor plate of any size very easily and at low cost.

Since it can be produced by punching and bending steel plates, no special equipment is required, making it convenient for mass production.

Floorboards with various strengths can be obtained depending on the width of the C-shaped steel flange.

A grid-like wiring groove can be created by forming rectangular floorboards and laying them out horizontally and vertically.

[Brief explanation of drawings]

Fig. 1 is a front view showing the deflection of the web of the C-section steel, Fig. 2 is a side view showing the deflection in the longitudinal direction, Fig. 3 is a plan view showing the method of reinforcing the end of the C-section steel, and Fig. 4 is a side view showing the deflection in the longitudinal direction. The figure is a perspective view of an example of C-shaped steel, Figure 5 is a front view of an example of a connecting leg, Figure 6 is a front view of an example of a floor plate, and Figure 7 is a side view of an example of construction of a floor plate.
Fig. 8 is a front view of another embodiment of the C-shaped steel, Fig. 9 is a front view of an example of a method for reinforcing the C-shaped steel, Fig. 10 is a front view of another embodiment of the connecting leg, and Fig. 11. 12 is a side sectional view of another embodiment of the connecting portion, and FIGS. 12 to 14 are plan views showing different implementations of the floorboard construction method.

Claims (1)

[Scope of Claims] 1. A plurality of semi-cylindrical bodies having the same length and opening downward and having a substantially square cross-sectional shape are arranged in parallel, and the lower part of at least both ends of both side walls of each semi-cylindrical body is arranged in parallel. An upward fitting notch is formed at the same position on the edge, and has the same length as the total width of the parallel semi-cylindrical bodies,
The upper edge of the connecting plate, which is made of a rigid band-shaped plate,
A downward fitting notch is provided at a location corresponding to the fitting notch of the semi-cylindrical bodies, and the fitting notch on the lower surface of the juxtaposed semi-cylindrical bodies and the fitting notch on the upper edge of the connecting plate are connected to each other. By inserting the connecting plates so that they mesh with each other, the upper edges of the connecting plates are pressed against the inner lower surface of the semi-cylindrical bodies, and the semi-cylindrical bodies are connected to each other.
Also, a composite floor board formed by joining a semi-cylindrical body and a connecting plate, characterized in that legs projecting downward are attached to at least both ends of the connecting plate.