JPH0317347A - Floor joist structure - Google Patents

Abstract

PURPOSE:To obtain a double floor which can be easily executed, by inserting a floor joist with notches at both bottom edges thereof into an assembly of erected supporting walls to place floor plates thereon. CONSTITUTION:A pierced hole 12 is made in the middle of a square steel bottom plate 11 pressed and supporting walls 14 are erected on the four sides 13. And groove-notches 15 are provided at right angles to the outer edges of the supporting walls 14 to form a box by bending the supporting walls 14 in the same sides on the peripheral edges. Further, the bottom plate 11 is formed to be a dish and to form an assembly 1 with a nut 16 and bolt 17 screwed together at the middle thereof. And a steel plate is bent to form a half- cylindrical C-shaped steel floor joist 2 with an opening at the bottom side and groove-notches 15 made vertically from the bottom edge 22 to the part are provided at the both ends of the flanges 21 of the both sides of the floor joist member 2. Moreover, slits 24 are provided on the web 23. The groove-notches 15 of the floor joist member 2 are matched with the groove-notches 15 of the assembly 1.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a joist structure that constitutes a double floor.

[Conventional technology]

In Japanese Patent No. 861-242540, the title of the invention is ``Subfloor structure,'' the inventor describes ``a method in which bundles are installed at intervals on a slab, and a vertical web and a horizontal flange attached to the lower end of the bundle are installed on the slab at intervals. Joist material that has as an essential element,
We proposed a joist structure in which the flanges are installed between bundles so that they are lower than the tops of the bundles.

[Problem that the invention seeks to solve]

Although the above invention achieved the desired effects, such as creating a low floor substructure, allowing the use of uniaxially strong floorboards, and making leveling work easier, the following drawbacks were found. Ta.

That is, ■It is very convenient for forming parallel joists, but it is troublesome to form lattice-like joists. ■Since long joists are used, the problem is that unless the correct level is achieved, the joists will wobble and the trick will not work.

The present invention aims to improve such conventional methods and provide a joist structure that is easy to construct and has a wide range of uses.

[Means to solve problems]

For this purpose, in the present invention, a bundle having a plurality of supporting walls erected around its periphery is installed on a slab at predetermined intervals. A joist with an upward groove cut on the lower edge of both ends is hung between adjacent bundles. A wall 14 is attached. Two groove-shaped cuts 15 are provided on the outer side of the support wall, which are perpendicular to each side.

As shown in FIG. 2, each of the supporting walls 14 is bent at right angles to the same side at the peripheral edge l3 to form a box shape. As shown in the figure, the bottom plate 11 is reinforced by being shaped like a plate. A nut 16 is attached to the center of the bottom surface, and a bolt leg 17 is fastened to the nant to form the bundle 1.

As shown in Fig. 3, a joist material 2 is formed by bending a galvanized steel plate to form a semi-cylindrical C-beam with an opening downward.
Grooves 15 are provided at both ends of the flanges 21 on both sides, extending upward from the lower edge 22 at right angles.

The web 23 has a pair of slits 2 along the center line.
4 will be placed here and there. As shown in FIG.
1! ! A partition plate 26 made of a thin plate with 125 attached thereto is formed. This partition plate is inserted into the slit and erected on the upper surface of the web of the joist. This partition board is used to prevent floorboards from slipping off when installed on top of the joists.
It is convenient to leave it detachable so that you can use it when needed and remove it when it gets in the way.

A joist structure 3 is constructed using such a bundle 1 and joist materials 2.

As shown in Fig. 5, bundles l are installed on the slab at equal intervals vertically and horizontally, and using two opposing support walls 14, joists 2 are placed between the adjacent support walls. Hang them one after another in a straight line. A parallel joist structure 3A can be formed.

FIG. 6 shows a lattice-like joist structure 3B, which is formed by hanging joists 2 vertically and horizontally between the supporting walls of adjacent bundles 1.

When hanging the joists 2 on the support wall 14, as shown in FIG. They interlock with each other in the same way.

A double floor is formed by installing floorboards on top of the joist structure shaped as described above. Although the shape of the floorboard is not particularly limited, it may be flat.

In particular, if a partition plate is attached to the top surface of the joist, the periphery will be surrounded by the partition plate, so the floorboard will not fall off, so an open-cut flat plate can be used.

〔supplementary explanation〕

In this invention, when forming the parallel joist structure 3A, both ends of the bottom plate can be bent upward at right angles to form a bundle with two supporting walls.

However, in this case as well, in order to eliminate bending of the bottom plate, it is desirable to bend the other two sides to form ribs. In this sense, it is preferable to have the bottom plate bent on all four sides, since the support wall also functions as a rib.

As shown in FIG. 8, the bundle 1 may have a regular hexagonal shape and have six support walls 14 around its periphery. It is possible to use the truss-like joist structure 3C and use triangular floor plates. Three-point support for floorboards is better for preventing wobbling.

Further, the bundle 1 of the present invention has a cylinder 10 as shown in FIG.
It is also possible to form the joist 2 with groove-like cuts in the joist material 2 and hang it on the upper edge of the supporting wall 14 around the joist material. If the perimeter is circular, it is convenient because you can hang any number of joists. Joist material The joist material of this invention can have various cross-sectional shapes.

To illustrate the cross section of the joist material 2, Fig. 10+11 to (8)
It is as follows. Normally, the basic shape is that a horizontal web 23 and a flange 21 perpendicular to the horizontal web 23 are integrally formed. Strictly speaking, what is essential to a joist is a flange that has a width in the vertical direction, and the moment of inertia generated by this width becomes the force of the support wall that supports the weight of the suspended floorboards.

The groove-like cut 15 in the joist material is essential to prevent the joist material from falling off the support wall of the bundle.

On the other hand, the groove-like cut in the support wall can be omitted. Of course, if the groove-shaped cuts engage with each other, there will be no lateral displacement and the parts can be firmly fixed, so it is desirable to have groove-shaped cuts on both sides.

When simply hanging the groove-shaped cut 15 in the joist material over the upper edge of the support wall, it is preferable to provide the groove-shaped cut 15 in the joist material 2 completely inside the flange 21, as shown in FIG. .

The method of constructing the floorboard 4 varies depending on the shape of the joist 2, as shown in FIG. 12 (11 to (5)). (2) A structure in which a flat floor plate 4 is dropped into a frame surrounded by the partition plates on a joist 2 made of C-shaped steel on which a partition plate 26 is erected. (3) A hat. A flat floor plate 4 is installed on the collar of a joist 2 made of shaped steel. (4
) A floorboard 4 having a groove-like cut on the lower edge of the end is hung over a joist 2 made of upward facing C-shaped steel. (5) The same floorboard 4 as above is hung over a joist 2 made of hunt shaped steel with a lip.

As for the joist structure, as mentioned above, the parallel joist structure
A lattice-like joist structure, a truss-like joist structure, etc. are possible, but a mixture of these structures may also be used.

For example, as shown in FIG. 13, the entire structure is constructed into a lattice-like joist structure 3B, and a part is formed into parallel horizontal joist structures 3A. If this is done, there will be no joists in the areas where the parallel joist structure exists, so when the floorboards are lifted up after construction, there will be continuous grooves, resulting in a joist structure that is easy to wire.

〔effect〕

Since the joist structure of the present invention is constructed in this way, it has the following features.

(11) The structure of the bundles and joists is simple and can be produced in large quantities by hand at low cost.

(2) Installation is simple because the joists can be easily attached to the bundles.

(3) Since the joists are installed in a floating state due to the bundle, wiring and piping can be installed under the joists.

(4) Since the bundles are diverse and can have any joist structure such as parallel, lattice, or truss, it is possible to create a structure that meets your needs, such as a large joist structure with wiring grooves.

(5) A variety of joist materials can be used, and there is a high degree of freedom in selecting floorboards accordingly. For example, a flat plate can also be used. Since the flat floor plate can be used without cutting, it is extremely convenient for constructing a portion of the border that requires cutting.

(6) Since the joist material is divided into bundles and between bundles, the joist structure can be bent at the bundles, so it can adapt even if the slab is uneven.

[Brief explanation of drawings]

Fig. 1 is a plan view of a steel plate showing an example of the bundle production process, Fig. 2 is a side sectional view showing an example of the bundle, Fig. 3 is a perspective view showing an example of joist material, and Fig. 4 is a plan view of a steel plate showing an example of the bundle production process. , a plan view showing an example of a partition plate, FIGS. 5, 6, and 13
Figure 7 is a plan explanatory diagram showing an example of the construction situation of a joist structure. Figure 7 is a side explanatory diagram showing the interlocking situation of the bundle and joist materials. Figure 8 is another example of the bundle and the construction of the joist structure. FIG. 9 is a plan view showing an example of the situation; FIG. 9 is a plan view showing another example of the bundle and an example of a method for hanging the joists; FIG. FIG. 11 is a side view showing another example of the joist material, and FIG. 12 (11 to (5) are front views showing an example of the method of constructing the floorboards.

Claims (1)

[Claims] A bundle consisting of a plurality of supporting walls erected on the peripheral edge is installed on a slab at predetermined intervals, and an upward groove-shaped cut is provided at the lower edge of both ends to be inserted into the supporting walls. A joist structure is made by hanging the provided joists between adjacent bundles.