JP4309809B2 - Building floor joists - Google Patents

Description

The present invention relates to a floor joist of a building in which a plurality of joists made of metal square steel pipes are arranged in parallel at regular intervals.

Conventional floor joists (hereinafter referred to as floor joists) of buildings are known as shown in FIG. 3 (see, for example, Patent Documents 1 and 2 ).

The floor joist 1 has a lower surface supported by a plurality of floor beams 3 that are parallel to each other between a pair of floor beams 2 and 2, and both ends 5 </ b> A and 5 </ b> A are supported by a pair of wife floor beams 4. A plurality of joists 5 are provided. The plurality of joists 5 are arranged in parallel along a direction perpendicular to the floor beam 3 and the floor girder 4.

Further, a floor plate 6 made of a particle board having a thickness of 15 mm, for example, is provided on the upper surface of the plurality of joists 5, and each joist 5 is covered with the floor plate 6. In FIG. 3,
Although the floor board 6 covers a part of the plurality of joists 5, all the joists 5 are usually covered with the floor board 6.

And as shown in FIG.3 (b) and FIG. 4, the support part 5B which the lower part was cut off and protruded in the longitudinal direction is formed in both ends 5A and 5A of each joist 5, respectively. The supporting portion 5B is supported by the end floor beam 4, and the joist 5 is fixed to the floor end beam 4 by a tapping screw 7 that passes through the supporting portion 5B and the floor plate 6.

Furthermore, in order to adapt the building having the conventional floor joist 1 to a so-called quasi-refractory building, the floorboard 6 must have a structure that can withstand deformation and the like for 45 minutes after the start of heating.

Therefore, in the case of a building suitable for such a quasi-refractory building, for example, a floor board 6 'is formed to a thickness of 24 mm by laminating a particle board 6A having a thickness of 12 mm and a hard wood cement board 6B having a thickness of 12 mm. .

Moreover, even if the floor is a floor that requires a predetermined fire prevention performance for use in different types of application sections, the floor board has been formed with the above-mentioned thickness of 24 mm.

Thus, when the thickness of the floor board 6 is changed from 15 mm to 24 mm, the upper surface of the floor board 6 is positioned upward by the increased thickness of the floor board 6. Therefore, FIG.
As shown in), the height H ₁ of the support portion 5B of the joist 5 by increased thickness of the floor panel 6 depressed (small), reduce the height H ₂ of up to the upper surface of the joist 5 from the installation surface S (small ) Was considered.

However, in this manner to reduce the height H ₁ of the support portion 5B, if the root of the strength is lowered in the support portion 5B, the load F from above is loaded, as shown in FIG. 5 (b), the support There was a possibility that the base of the portion 5B was damaged.

Therefore, when the thickness of the floor plate 6 is changed, as shown in FIG. 6, a support member 8 having a U-shaped cross section is provided on the open side of the end floor beam 4, and a side surface of the support member 8 is provided. It has been considered that the joist receiving plate 9 is fixed by welding and the end 5A of the joist 5 is fixed to the upper surface of the joist receiving plate 9 with a tapping screw 7.

On the other hand, in order to increase the strength of the joists 5, it is also known that the joists 5 are formed of a metal square steel pipe (for example, see Patent Document 3 ).
Japanese Patent Publication No. 7-6233 Japanese Patent Publication No.58-37462 JP 2004-19191 A

However, in the conventional floor joist 1, when the thickness of the floor board 6 is changed in order to make the building suitable for a semi-refractory building, the joist receiving plate is provided on the side surface of the support member 8 provided on the open side of the end floor beam 4. 9 had to be fixed by welding, and a welding process was required.

Further, since the support member 8 and the joist receiving plate 9 are necessary, there are problems that the number of parts increases and the manufacturing cost also increases.

Furthermore, when the joist 5 is formed of a metal square steel pipe, the longitudinal intermediate portion of the joist 5 is cut, and a tapping screw 7 is passed through the upper wall 5C in the vicinity of the cut end so that the floor beam 3 and the like When fixing to (see FIG. 7A), a load or an impact is applied around the tapping screw 7 and the upper wall 5C of the joist 5 may be deformed (see FIG. 7B).

Therefore, the present invention can easily change the height from the installation surface to the upper surface of the joist according to the thickness of the floor board and does not reduce the strength of the joint between the joist and the floor frame. The issue is to provide the floor joists.

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the upper surface is covered with a floor plate, the lower surface is supported by a floor beam supported by a square frame-like floor frame, and both ends are the floor. A floor joist of a building having a joist made of a metal square steel pipe supported by a frame, the joists being arranged in parallel at regular intervals, and at both ends of the joist, there are lower portions A support portion that is inverted U-shaped in cross section and is supported on the upper surface of the floor frame is formed by cutting, and a spacer is disposed inside the support portion, and the joist is interposed through the spacer. And is fixed to the floor frame by a fixing member penetrating the support portion and the spacer .

According to the second aspect of the present invention, the upper surface is covered with a floor board, the lower surface is supported by a floor beam supported by a square frame-like floor frame, and both ends are supported on the floor frame. A floor joist of a building in which a plurality of the joists are arranged in parallel at regular intervals, and the upper walls of both ends of the joists are bent at the ends. A formed stiffening portion is provided .

According to a third aspect of the present invention, at both ends of the joist, a support portion supported by the upper surface of the floor frame is formed by cutting the lower portion and having an inverted U-shaped cross section. spacer is disposed on the inner side, the joists is supported on the underframe via the spacer, as a feature to be fixed to the floor frame by a fixing member penetrating the supporting portion and the spacer Yes.

According to the invention of claim 1 of the present application, since the support portion supported by the upper surface of the wife floor beam in the inverted U-shaped cross section is formed at both ends of the joist, by changing the height of this support portion, The height from the installation surface to the upper surface of the joist can be appropriately changed according to the thickness of the floor board.

Therefore, regardless of the thickness of the floor board, the height from the installation surface to the upper surface of the floor board can be made constant with an easy structure.

Moreover, since the joist is a metal square steel pipe, it is possible to prevent the strength of the joint between the joist and the floor frame from being lowered.

Further, since the joist is fixed to the floor frame by the support member and a fixing member that penetrates the spacer disposed inside the support portion, the joist can be easily fixed to the floor frame and the support portion is deformed. Can be reliably prevented.

According to the invention of claim 2 of the present application, since the stiffening portions formed by bending are provided on the upper walls of both ends of the joists, the strength of the upper walls of both ends of the joists can be increased. . Therefore, even when both ends of the joists are fixed to the floor frame with nails or the like, the upper wall of the joists can be prevented from being deformed.

According to the invention of claim 3 of the present application, in addition to the effect of claim 2 , the floor joist is attached to the floor frame by the support member having the stiffening portion formed therein and the fixing member penetrating the spacer disposed inside the support portion. Since it is fixed, the joist can be easily fixed to the floor frame, and deformation of the support portion can be further prevented.

Next, a floor joist of a building according to the best mode for carrying out the present invention will be described with reference to the drawings.

A building unit 10 shown in FIG. 1A is a steel frame including a floor beam 11, a column 12 erected on the floor beam (floor frame) 11, and a ceiling beam 13 supported on the top of the column 12. It has a structure.

The floor beam 11 includes a pair of end floor beams 14 and 14 arranged in parallel, and the pair of end floor beams 14 and 1
4 is provided with a pair of girder beams 15 and 15 spanning the end portions of 4 and has a rectangular frame shape. A plurality of floor beams 16 are spanned between the pair of girder floor beams 15 and 15.

In addition, a plurality of joists 20 are arranged in parallel along the direction perpendicular to each floor beam 16 above the end floor beam 14, and the lower surface of each joist 20 is supported by the floor beam 16.

On the upper side of the joist 20, a floor board 17 is disposed, and the upper face of each joist 20 is covered with the floor board 17. Although the floor board 17 in FIG. 1A covers only some joists 20, all joists 20 are usually covered by the floor boards 17.

The pillars 12 are respectively provided at the joint portions between the end floor beam 14 and the girder floor beam 15 and stand substantially vertically.

The ceiling beam 13 is disposed in parallel with the end floor beam 14 and is disposed in parallel with the pair of end ceiling beams 18 and 18 spanned between the columns 12 and the girder floor beam 15 and between the columns 12. A pair of girder ceiling beams 19, 19 spanned across the plurality of auxiliary beams 19 a spanned between the girder ceiling beams 19, 19
And.

And the ceiling panel which is not illustrated is attached to the lower surface side of the auxiliary beam 19a, and a ceiling is formed.

The joist 20 is formed of a metal square steel pipe whose cross section in the short side direction is substantially square. The square steel pipe is hollow, and the wall thicknesses 20A to 20C of the wall surfaces 20A to 20C (FIG. 1 (
Here b) is 8 mm each. Moreover, this thickness T is not restricted to this, You may change to desired thickness suitably.

And in both ends 21 and 21 of the longitudinal direction of this joist 20, as shown in FIG.1 (b),
The lower portions are cut off to form support portions 22 each having a reverse U-shaped cross section in the short direction.

That is, the support portion 22 extends from the vertical middle portion of the one side wall 20B of the joist 20 to the lower wall 2.
0C is formed by cutting off the middle part in the vertical direction of the other side wall (not shown), and the upper wall 20A and a pair of side walls 20B (the other side not shown) project in the longitudinal direction.

Therefore, by changing the position to cut the vertically intermediate portions of the pair of side walls 20B, it is possible to change the height H ₃ of the supporting portion 22 appropriately.

A spacer 23 having a rectangular parallelepiped shape is disposed on the inner side (open side) of the support portion 22 so as to be inscribed therein. This height H ₄ of the spacer 23 is larger than the height H ₃ of the support portion 22, a lower surface than the lower end of the side wall 20B is slightly projected downward. Thereby, as will be described later, when the joists 20 are arranged on the end floor beam 14, the lower end of the support portion 22 does not come into contact with the end floor beam 14.

The spacer 23 is formed of plywood, a volcanic glassy multilayer board, or the like, and is not easily cracked or chipped even when a screw, a nail, or the like is driven.

Here, the joists 20 are in close contact with the upper wall 20A and both side walls 20B.
It may not be in close contact with 0B.

And in order to form the floor joist of this building unit 10, first, the lower part of the both ends 21 and 21 of the longitudinal direction of the joist 20 formed by the square steel pipe is cut off, respectively, and the support part 22 having an inverted U-shaped cross section is obtained. Form.

Next, a spacer 23 formed in advance so as to be inscribed in the support portion 22 is inserted inside the support portion 22 and bonded and fixed with an adhesive (not shown) or the like.

Then, the support portion 22 having the spacer 23 bonded and fixed to the inside is disposed on the end floor beam 14, and the joist 20 is attached to the end floor beam 14 by a tapping screw 7 that is a fixing member that penetrates both the support portion 22 and the spacer 23. Fix it.

Thus, since the joists 20 and secured to the wife floor beams 14 by a longitudinal section opposite formed at both ends 21, 21 U-shaped support portion 22, changing the height H ₃ of the support portion 22 By doing so, the height from the installation surface to the upper wall 20A of the joist 20 can be appropriately changed.

Since the height from the installation surface to the upper wall 20A of the joist 20 can be changed according to the thickness of the floor plate 17, the height from the installation surface to the upper surface of the floor plate 17 is always constant regardless of the thickness of the floor plate 17. It becomes possible to do.

Further, since the floor joists 20 are formed by square steel pipes made of metal, strength without almost drops smaller than the height H ₃ is the thickness of the middle portion of the joists 20 of the support portion 22, joists 20
It is possible to prevent a decrease in the strength of the joint between the floor floor beam 14 and the end floor beam 14.

And since the tapping screw 7 was penetrated inside the support part 22 via the spacer 23,
The support portion 22 is supported by the spacer 23 from the inside, and the upper wall 20A of the support portion 22 can be prevented from being deformed by the impact of driving the tapping screw 7.

In addition, the support portion 22 can be easily positioned and arranged on the floor floor beam 14 by the spacer 23, and can be easily fixed.

On the other hand, when floor joists are divided at the middle in the longitudinal direction to form entrances, stairs, etc.
As shown in FIG. 2, the joists 20 are cut at the intermediate portion in the longitudinal direction.

Then, as shown in FIGS. 2A and 2B, the end portion of the upper wall 20 </ b> A of the joist 20 is bent downward to form the stiffening portion 24.

The stiffening portion 24 is formed by denting the end of the upper wall 20A over its entire length, and improves the strength of the upper wall 20A.

Therefore, as shown in FIG. 2C, even when a load or impact is applied around the tapping screw 7 when the tapping screw 7 is driven into the upper wall 20A of the joist 20, as shown in FIG.
Deformation of the upper wall 20A can be prevented.

Although not shown, a stiffening portion 24 may be formed at the end of the support portion 22 described above. In this case, the strength of the upper wall 20 </ b> A of the support portion 22 is improved by the stiffening portion 24, and further, the strength of the joint portion between the joist 20 and the end floor beam 14 can be prevented from being lowered.

And in the case where the spacer 23 is arranged inside the support part 22 in which the stiffening part 24 is formed,
In addition to preventing deformation of the upper wall 20A of the support portion 22 by the spacer 23, the stiffening portion 2
4 makes it possible to improve the strength of the upper wall 20A.

Therefore, the joist 20 can be easily fixed to the end floor beam 14 and the deformation of the support portion 22 can be further prevented.

Although one embodiment according to the present invention has been described in detail with reference to the drawings, a unit building may be formed by combining a plurality of building units 10 having floor joists according to the present invention. In this case, the height from the installation surface to the upper surface of the joist 20 can be easily changed corresponding to the thickness of the floor board 17, and the strength of the joint portion between the joist 20 and the end floor beam 14 can be reduced. It becomes possible to provide no unit building.

Moreover, the floor joist of the building of this invention is not restricted to the floor of a building unit, It can be applied also to floors, such as a prefab house. Even in this case, it is possible to easily change the height from the installation surface to the top surface of the joist according to the thickness of the floor board, and to reduce the strength of the joint between the joist and the floor beam. It will be possible to provide no prefabricated houses.

It is a perspective view showing the whole building unit provided with floor joists of an embodiment of this invention. It is an enlarged view of the A section in Fig.1 (a). (A) is a perspective view which shows the case where the floor joist of this invention is cut | disconnected by the longitudinal direction, (b) is BB sectional drawing in Fig.2 (a), (c) is FIG.2 (a). ) Is an explanatory diagram when the tapping screw is passed through, and (d) is an explanatory diagram showing a case where the tapping screw is penetrated in FIG. (A) is a perspective view which shows the whole building provided with the conventional floor joist, (b) is an enlarged view of the C section in Fig.3 (a). It is DD sectional drawing in Fig.3 (a). (A) is explanatory drawing which shows the case where the thickness of a floor board is changed in the conventional floor joist, (b) is explanatory drawing which shows the case where a load is loaded from upper direction in Fig.5 (a). It is explanatory drawing which shows the case where it changes further according to the thickness of a floor board in the conventional floor joist. (A), (b) is explanatory drawing which shows the example which used the conventional floor joist as the steel pipe.

Explanation of symbols

7 Tapping screw (fixing member)
10 Building unit (building)
11 Floor beams (floor frame)
16 floor beam 17 floor board 20 joist 21, 21 both ends 22 support part
23 Spacer
24 Stiffening part

Claims (3)

The upper surface is covered with a floor plate, the lower surface is supported by a floor beam supported by a square frame-like floor frame, and both ends have joists made of a metal square steel pipe supported by the floor frame. , The joists are floor joists of a building that are arranged in parallel at regular intervals,
At both ends of the joists, by forming a support portion that is supported by the upper surface of the floor frame, and having an inverted U-shaped cross section by cutting off the lower part ,
A spacer is disposed inside the support portion, and the joist is supported by the floor frame via the spacer and is fixed to the floor frame by a fixing member that penetrates the support portion and the spacer. The floor joist of the building characterized by that. The upper surface is covered with a floor plate, the lower surface is supported by a floor beam supported by a rectangular frame-like floor frame, and both ends have a joist made of a metal square steel pipe supported on the floor frame. And the joists are floor joists of a building that are arranged in parallel at regular intervals,
A floor joist of a building, wherein a stiffening portion formed by bending the end portion is provided on the upper wall of both ends of the joist. At both ends of the joist, a lower U-shaped cross section is formed by cutting off the lower part, and a support part supported on the upper surface of the floor frame is formed, and a spacer is disposed inside the support part, the joists is supported on the underframe through said spacer, the fixing member penetrating the supporting portion and the spacer of the building according to claim 2, characterized in that it is fixed to the bed frame Floor joists.

Images