JPH10238008A - Roof truss - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roof truss with sufficient strength for great span structure with hard buckling. SOLUTION: A roof truss has slant member 7 mounted between an upper chord member 5 and a lower chord member 6 into one unit. The lower chord member 6 is formed with a grooved steel open upward and the upper chord member 5 is formed with a H-type steel. The roof truss to support vertical load is formed in a hard buckling structure for supporting great roof load, because the upper chord member 5 as an axial member to be subjected to compressive load and to be buckling is formed with a H-type steel in a great cross section (a large sectional coefficient). In this way, it is provided with sufficient strength in a great span structure and designed with a compact section. Parts used to mount roof backing member or roof panels 15 can be easily mounted on grooves at the upper side of the H-type steel into a well-fittable and reasonable structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a roof truss.

[0002]

2. Description of the Related Art Conventionally, as a roof truss for supporting a vertical load, for example, as shown in FIG. 18, both an upper chord member 50 and a lower chord member 51 are formed of channel steel. Upper chord material 50
Since a shaft member bears a compressive load as a shaft member and is likely to buckle, sufficient buckling strength is required.

[0003]

However, since the conventional roof truss uses a channel steel having a small section modulus for the upper chord material 50, the strength is insufficient for a large span (7 m to 9 m) structure. There was a problem that it was inappropriate. Accordingly, an object of the present invention is to provide a roof truss which does not easily buckle and can obtain sufficient strength even for a large span structure.

[0004]

According to a first aspect of the present invention, there is provided a roof truss which is an integrated roof truss having a diagonal member interposed between an upper chord member and a lower chord member, wherein the lower truss member has an upwardly open groove. , And the upper chord material is formed of an H-shaped steel material. As described above, in the roof truss supporting the vertical load, the upper chord member which bears the compressive load and causes buckling as the shaft member is formed of an H-shaped steel material having a large cross section (having a large section modulus). It has a difficult structure and can support a large roof load. Thus, sufficient strength can be obtained even for a large span structure, and a design with a compact cross section can be made. Further, parts for mounting, such as a roof base material and a roof panel, can be easily mounted in the upper groove portion of the H-shaped steel material, and a well-fitted and rational structure can be obtained.

According to a second aspect of the present invention, in the roof truss according to the first aspect, an upper chord member formed of an H-shaped steel material and a lower chord material formed of an upwardly opening grooved steel material have substantially the same flange interval. Then, the both ends of the oblique material were fixed in a state of being fitted between the flanges of the upper chord material and the lower chord material. As described above, since the flange interval of both the upper chord material and the lower chord material is substantially the same and both ends of the diagonal material are fixed in a state of being fitted between the flanges of the upper chord material and the lower chord material, the upper chord material and the lower chord material are fixed to these. The joining connection with both ends of the diagonal material to be joined becomes the same. That is, since the outer width of the diagonal member is substantially equal to the inner width of the opposing flanges of the upper chord member and the lower chord member at the joint, and the outer side surface of the diagonal member abuts the inner side surface of the flange without any gap, the upper chord member and the lower chord member The joint strength between the roof truss and the diagonal is stabilized, and the workability of assembling the roof truss is improved. Further, the thickness dimension of the roof truss becomes uniform, and the board can be stably mounted on the side of the roof truss.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A roof truss according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional side view showing a part of a structure of a building using a roof truss according to an embodiment of the present invention, FIG. 2 is a conceptual diagram showing the appearance of the building, and FIG. It is a conceptual diagram showing arrangement. This building has a ridge roof, and its ridge A
The roof truss 1, 1 is disposed so as to be orthogonal to both ends of the roof truss. Also, trapezoidal roof trusses 2, 2 parallel to the roof truss 1 so as to pass through the middle part of the descending ridge B, which slopes down from both ends of the ridge A to the corners of the building.
Is arranged. A roof panel 15 is placed on the roof trusses 1 and 2, and both ends are supported by upper ends of the outer wall panels 3.

As shown in FIG. 4, the triangular roof truss 1 is formed by interposing a diagonal member 7 and a vertical frame 8 between two inclined upper chord members 5, 5 and a lower chord member 6, and integrating them. is there. The lower chord material 6 is formed of an upwardly opening grooved steel material, and the upper chord material 5 is formed of an H-shaped steel material. The diagonal members 7 and the vertical frames 8 are formed of channel steel. The distance between the flanges 5a and 6a of both the upper chord member 5 and the lower chord member 6 is substantially the same, and the oblique member 7 and the vertical frame 8 are fixed in a state of being fitted between the flanges 5a and 6a of the upper chord member 5 and the lower chord member 6. I have.

That is, as shown in FIG. 5 which is an enlarged view of a portion C of FIG. 4, the upper end of the diagonal member 7 and the vertical frame 8 is fitted into the groove below the upper chord member 5, and the web 5b of the upper chord member 5 is fitted. And fixed by welding. In this case, since the width of the upper chord member 5 is 80 mm and the thickness of the flange 5 a is 2.3 mm, the interval between the inner surfaces of the opposed flanges 5 a is 75.4 mm, and the width of the diagonal member 7 and the vertical frame 8 is 75 mm. 0.
There is 4mm clearance. Reference numeral 25 denotes a fixing tool insertion hole, which is used when mounting a roof base material or the like. As shown in FIG. 6 which is an enlarged view of a portion D in FIG. 4, the lower end of the lower chord 6 is fitted with the oblique member 7 and the lower end of the vertical frame 8 fitted into the groove of the lower chord 6 and fixed by welding. Is done. The width of the lower chord 6 and the thickness of the flange 6a are the same as those of the upper chord 5, and have a clearance of 0.4 mm in the fitted state.

Further, as shown in FIGS. 7 and 8, both ends of the lower end of the upper chord member 5 and the end of the lower chord member 6 are welded by two plates 9, 9 as shown in FIGS. Are fixed together. At the lower end of the plate 9, a mounting piece 10 having a fixing tool insertion hole formed therein is horizontally projected. Further, as shown in FIG. 9, the upper portion F of the roof truss 1 is integrally fixed to the upper end portions of the opposed upper chord members 5 and 5 and the upper end portion of the vertical frame 8 by welding with a plate 11.

In the trapezoidal roof truss 2, as shown in FIG. 10, an upper chord member 12 having the same cross section is horizontally arranged between two inclined upper chord members 5, 5. 12
An oblique member 7 and a vertical frame 8 are interposed between the lower chord member 6 and the lower chord member 6 to be integrated. In this case, the flanges 5 of the upper chord members 5, 12
The diagonal member 7 and the vertical frame 8 are fixed between the a and 12a and the flange 6a of the lower chord member 6 in a fitted state.

That is, FIG. 11 is an enlarged view of a portion G in FIG.
In the above, the diagonal member 7 is provided in a groove portion below the horizontal upper chord member 12.
And the upper end of the vertical frame 8 is fitted to the web 12b of the upper chord material 12.
And fixed by welding,
Both side surfaces of the horizontal upper chord material 12 and the inclined upper chord material 5 are integrally fixed by welding by an end plate 13. Also, as shown in FIG. 12, which is an enlarged view of a portion H in FIG. 10, the diagonal member 7 and the lower end of the vertical frame 8 are fitted into the groove portion of the lower chord material 6, and are positioned by the web 6b of the lower chord material 6 and welded. Is fixed. In addition, the joining portion of the trapezoidal roof truss 2 corresponding to the joining portion of the triangular roof truss 1 is joined in the same manner.

The roof truss 1, 2 constructed as described above
The roof is constructed as shown in FIG. 13 and FIG. In this case, the lower end of the roof panel 15 arranged on the roof trusses 1 and 2 is supported by the eaves girder 17 installed on the upper end of the outer wall panel 16. As shown in FIG. 14, which is an enlarged view of a portion J in FIG.
Are mounted, and the mounting piece 10 at the end of the triangular roof truss 1 is placed thereon and fixed with bolts 19. In addition, the roof panel 15 is connected to the upper chord material 5 by the connection hardware 20. The connecting hardware 20 has a plate shape, and is fixed to the outer surface of the frame of the roof truss 1 and the outer or inner surface of the flange 5 a by bolts 21. The fixing structure of the end of the trapezoidal roof truss 2 and the connection structure with the roof panel 15 are the same as those of the triangular roof truss 1.

As shown in FIG. 15 which is an enlarged view of a portion K in FIG. 13, a roof base material 22 is placed on top of the triangular roof truss 1 so as to correspond to the upper chord materials 5 and 5 on both sides.
, The roof panels 15, 15 are installed. Also in the trapezoidal roof truss 2, as shown in FIG. 17 in which the L portion of FIG. 16 is enlarged, the roof panel 15 , 1
5 is installed.

As described above, according to this embodiment, in the roof trusses 1 and 2 that support a vertical load, the upper chord members 5 and 12 that bear a compressive load and cause buckling as shafts have a large cross section (cross section). Since it is formed of an H-shaped steel material (having a large coefficient), it has a structure that does not easily cause buckling, and can support a large roof load. As a result, sufficient strength can be obtained even for a structure having a large span (7 m to 9 m), and a design with a compact cross section can be achieved. In addition, parts for mounting such as the roof base material 22 and the roof panel 15 can be easily mounted in the upper groove portion of the H-shaped steel material, and a well-fitting and rational structure can be obtained.

The upper and lower chords 5 and 6 have substantially the same flange spacing, and are fixed in such a manner that both ends of the slant 7 are fitted between the flanges 5a and 6a of the upper and lower chords 5 and 6. The upper and lower chord members 5 and 6 have the same joints at both ends of the oblique members 7 joined to them. That is, the outer width of the oblique member 7 and the inner widths of the opposed flanges 5a, 6a of the upper chord member 5 and the lower chord member 6 are substantially equal in the joint, and the outer surface of the oblique member 7 has a gap between the inner surfaces of the flanges 5a, 6a. Therefore, the joint strength between the upper chord member 5 and the lower chord member 6 and the diagonal member 7 is stabilized, and the workability of assembling the roof trusses 1 and 2 is improved. In this case, the inner width of the opposed flanges 5a and 6a is 75.4 mm, and the outer width of the diagonal member 7 is 75 mm, which is substantially equal. The same applies to the joint between the upper chord member 12 and the diagonal member 7. Also, the vertical frame 8 is attached in the same manner as the diagonal member 7, so that the joining strength is stabilized. Further, the thickness dimensions of the roof trusses 1 and 2 become uniform, and the boards can be stably mounted on the side surfaces of the roof trusses 1 and 2.

The roof trusses 1 and 2 may have a shape other than the above as long as the upper chord is made of H-shaped steel.

[0017]

According to the roof truss of the present invention, in a roof truss supporting a vertical load, an upper chord member which bears a compressive load and causes buckling as a shaft member has an H-shape having a large cross section (large section modulus). Since it is made of steel material, the structure is less likely to cause buckling, and a large roof load can be supported. This allows
Sufficient strength can be obtained even for a large span structure, and a design with a compact cross section can be made. Further, parts for mounting, such as a roof base material and a roof panel, can be easily mounted in the upper groove portion of the H-shaped steel material, and a well-fitted and rational structure can be obtained.

In the second aspect, the upper chord material and the lower chord have substantially the same flange spacing, and both ends of the diagonal material are fixed in a state fitted between the flanges of the upper chord material and the lower chord material. The joining connection between the material and the two ends of the diagonal material joined to them becomes the same. That is, since the outer width of the diagonal member is substantially equal to the inner width of the opposing flanges of the upper chord member and the lower chord member at the joint, and the outer side surface of the diagonal member abuts the inner side surface of the flange without any gap, the upper chord member and the lower chord member The joint strength between the roof truss and the diagonal is stabilized, and the workability of assembling the roof truss is improved.
Further, the thickness dimension of the roof truss becomes uniform, and the board can be stably mounted on the side of the roof truss.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing a part of a building structure using a roof truss according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing the appearance of a building.

FIG. 3 is a conceptual diagram showing an arrangement of a roof truss in the building of FIG.

FIG. 4 is a front view of the triangular roof truss according to the embodiment of the present invention.

FIG. 5 is an enlarged view of a portion C in FIG. 4;

FIG. 6 is an enlarged view of a portion D in FIG. 4;

FIG. 7 is an enlarged view of a portion E in FIG. 4;

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is an enlarged view of a portion F in FIG. 4;

FIG. 10 is a front view of a trapezoidal roof truss according to the embodiment of the present invention.

FIG. 11 is an enlarged view of a portion G in FIG. 10;

FIG. 12 is an enlarged view of a portion H in FIG. 10;

FIG. 13 is a front view of a triangular roof truss according to an embodiment of the present invention in a construction state.

FIG. 14 is an enlarged view of a portion J in FIG. 13;

FIG. 15 is an enlarged view of a portion K in FIG. 13;

FIG. 16 is a front view of a trapezoidal roof truss according to an embodiment of the present invention in a construction state.

FIG. 17 is an enlarged view of a portion L in FIG. 16;

FIG. 18 is a perspective view of a conventional roof truss.

[Explanation of symbols]

 1, 2 roof truss 5, 12 upper chord material 5a, 12a flange 6 lower chord material 6a flange 7 diagonal material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Maeda 1-4-1 Shinsenri Nishimachi, Toyonaka-shi, Osaka National Housing Industry Co., Ltd.

Claims (2)

[Claims] 1. A roof truss having a diagonal member interposed between an upper chord material and a lower chord material, wherein the lower chord material is formed of a groove-shaped steel material having an upward opening, and the upper chord material is an H-shaped steel material. A roof truss formed of: 2. An upper chord member formed of an H-shaped steel material and a lower chord material formed of an upwardly-opening grooved steel material have substantially the same flange interval, and both ends of a diagonal member are formed by the upper chord material and the lower chord material. The roof truss according to claim 1, wherein the roof truss is fixed in a state fitted between the flanges.