JPH11166293A - Composite beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the elastic buckling of webs and increase the rigidity and strength of a composite beam, by integrally joining structural plywood to the web, in the composite beam in which a pair of lip channels or light- weight channels are connected back to back. SOLUTION: Lip channels 11a, 11b are arranged back to back and the webs are connected to each other by spot-welding and a structural plywood board 15 is fixed to the webs with screws 21 to constitute a composite beam 1A. The webs of the lip channels 11a, 11b may be arranged to contact both faces of the structural plywood board 15 and integrally connected with screws 21. And further, light-weight channels are fitted to the composite beam 1A and the upper and lower flanges may be connected with screws 21 to form a composite beam with a box-shaped section. In this way, the web can be effectively reinforced and the decrease of the strength of the webs resulting from the elastic buckling is prevented to form a rigid beam 1A with high rigidity and strength. The web can be reinforced likewise even in a light-weight channel without lip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a beam member of a building, and more particularly, to a composite beam particularly effective when applied to a beam member of a building using an ultra-thin steel lightweight member. Things.

[0002]

2. Description of the Related Art In a building using an ultra-thin steel sheet lightweight section steel, a joist made of a lip thin section steel or a light groove section steel is used as a floor frame member. As shown in FIG. 14, such a joist is usually made of a lip channel steel 11 or a light channel steel 12 as a single unit, and its floor is plywood 37 with a drilling tapping screw 21 (hereinafter simply referred to as a screw). Is fixed to form a floor structure.

[0003] When structural strength and rigidity are required, for example, when the span of a floor directly below a wall or a floor is large, or floor vibration is reduced, a plurality of lip channel steels or light channel steels or both are used. Combined to form a combined beam. As the simplest combination beam, as shown in FIG. 15, a pair of lip channel steels 11a and 11b or light channel steel 1 is used.
There is a configuration in which the web portions 2a and 12b are abutted back to back, and the web portions are joined with screws 21 to form a substantially H-shape.

[0004] When further strength and rigidity are required, such as when there is no wall directly below the bearing wall and there is no wall on the lower floor, or when there is an opening in the floor surface, the lip shown in FIG. As shown in FIG. 16, light channel steels 12a and 12b are fitted on both sides of a combined beam 1a composed of channel steels 11a and 11b with their webs facing outward to form a box-shaped cross section. FIG. 17 is a cross-sectional view of a combination beam 1X formed by joining the respective portions with screws 21 or between the upper and lower flanges of the combination beam 1b composed of the light channel steels 12a and 12b configured as shown in FIG. As shown in FIG. 5, a combined beam 1Y is used in which lip channel steels 11a and 11b are fitted with the webs facing outward to form a box-shaped cross section, and upper and lower flange portions are joined with screws 21 respectively.

When connecting the upper and lower floors with such a combination beam 1X, 1Y (hereinafter the combination beam 1X will be described as an example), as shown in FIG. 18 and FIG. The combination beam 1X is joined by screws to the vertical frame 35 on the lower floor to which the upper frame 36 is attached, and the floor plywood 37 on the combination beam 1X and the vertical floor of the upper floor where the lower frame 39 is attached to the lower end. The frame 38 is placed, and the upper flanges of these combined beams 1X,
The floor plywood 37 and the lower frame 39 are joined together by screws.
The vertical frames 38, 35 of the upper and lower floors and the combination beam 1X are integrally connected to each other with a band 43 attached to the outside thereof.

[0006]

The plate thickness of the members forming the combination beams 1X and 1Y as described above is 0.8 to 1.6.
Because the web is extremely thin, and the length is long relative to the plate thickness, elastic buckling of the web precedes it. Therefore, most of the web is evaluated as invalid in terms of structural strength. For this reason, even if these members are combined into a substantially H-shape by using screws, the stiffening of the web is not effectively performed, so that the calculated proof stress does not improve much. In addition, lip channel steels 11a and 11b or light channel steel 12
a, 12b are combined to form a box-shaped cross-section combination beam 1X, 1
Even if Y is configured, the stiffening of the web remains inadequate, thus causing the same problem. Regarding the floor vibration, the member resonates in response to an impact due to the small thickness of the member, and a chattering noise is generated.

[0007] Further, these beam members have a web of a component member at the center in the width direction, so that it is difficult to connect the upper and lower floor walls or foundations with an axial bolt or an anchor bolt. Further, in the case of forming a box-shaped cross section and attaching the metal band 43 on the outside and joining them, as shown in FIG. 20, the metal band 43 is exposed in the room, or the upper and lower walls constituting the wall base material 41 and the wall frame are formed. Since the metal band 43 is interposed between the vertical frames 38 and 35, unevenness 44 occurs on the wall surface,
Not preferred for finishing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can be used under load-bearing walls, has bending strength and rigidity, and has no problem in finishing indoors. The purpose is to obtain a beam.

[0009]

According to the present invention, there is provided a composite beam comprising:
A pair of lip channel steels or light channel steels are back-to-back, a face material is brought into contact with at least one surface of the web, and the face material and the web are integrally joined.

[0010] The composite beam according to the present invention is a composite beam in which a pair of lip channel steels or light channel steels are back-to-back, a face material is sandwiched between the webs, and the web and the face material are integrally joined. is there.

Further, in the longitudinal direction of the face material of the composite beam, a space portion for discontinuously forming the face material and providing a shaft bolt or the like is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a composite beam in which a face material is integrally combined with a web portion of an assembled beam composed of a combination of a lip channel steel and a lightweight section steel. The effective cross-sectional area of the steel material is increased by the stiffening effect of the lip channel steel or lightweight shape steel by combining the web part with a highly rigid face material, joining with screws, bolts, etc. Since it can be large, even with the same combination of steel materials, a greater proof stress can be obtained.

When a face material that is effective in strength is used, such as a structural plywood, the strength can be added, so that a greater proof stress can be obtained. Also, when a damping material is used for the face material, the vibration of the steel material can be suppressed to prevent chattering noise. Furthermore, when the thickness of these face materials is set to be equal to or greater than the diameter of the anchor bolts or the shaft bolts connecting the upper and lower floors and sandwiched between the webs,
It is possible to insert these bolts by making the face material discontinuous only at the bolts, and it is possible to connect the upper floor bearing wall and the lower floor bearing wall or foundation with ordinary shaft bolts or anchor bolts. it can.

That is, according to the present invention, at least one pair of lip channel steel or light channel steel web is formed into a substantially H shape abutting back to back, and a face material is applied to at least one outer surface of the web. The web and face material are joined together by screws or bolts to form a composite beam.

In joining the steel web and the face material, the steel web is abutted back to back in advance,
The web may be joined with screws, bolts, spot welding, caulking, rivets, nails, or the like, and then the face material may be integrally joined to one surface of the web with screws, bolts, or the like. In addition, the lip channel steel or light channel steel constituting the composite beam may be appropriately combined with the required plate thickness and quantity for the required performance, and the anchor bolt and the shaft bolt are attached to the composite beam. By making the thickness of the face material to be sandwiched equal to or larger than the diameter of the bolt to be used, and making the face material discontinuous only at the penetrating portion of the bolt, it can be easily used. Hereinafter, embodiments of the present invention will be described in detail.

[Embodiment 1] FIG. 1 shows Embodiment 1 of the present invention.
FIG. 3 is a cross-sectional view of a composite beam according to the first example. In this example, the web is brought into contact with the pair of lip channel steels 11a and 11b back to back and joined by spot welding to form a substantially H-shaped cross section. Then, a structural plywood 15 as a face material is brought into contact with one surface of the web and joined with screws 21 to form a composite beam 1A. In addition, you may join the surface material 15 to both surfaces of a web as needed.

In the embodiment, web height: 235 mm, flange width: 40 mm, lip width: 20 mm, plate thickness: 1.0 mm
The webs of the lip channel steels 11a and 11b (hereinafter referred to as C-235 × 40 × 20 × 1.0) are brought into contact with each other and joined by spot welding, and a height 195 is attached to one surface of the web portion.
The structural plywood 15 of about mm was abutted, and two screws 21 were driven vertically from the structural plywood 15 side at 300 mm intervals in the longitudinal direction to be integrated.

In this case, other means such as screws and bolts may be used for joining the lip channel steels 11a and 11b, and the face material 15 to be used may be something other than structural plywood. In addition, the assembling procedure may be such that the face material 15 is attached after the webs of the lip channel steels 11a and 11b are joined as described above, or the lip channel steels 11a and 11b and the face material 15 are connected by screws, They may be joined in one step by bolts or the like.

The composite beam 1A constructed as described above is placed over the upper frame of the vertical frame constituting the load-bearing wall arranged at intervals on the same line, and is joined by screws. Then, a floor plywood is laid on the composite beam 1A, joined to the composite beam 1A by screws from the upper surface, and further, a lower frame of a vertical frame constituting an upper floor load-bearing wall is screwed and mounted thereon.

FIG. 2 is a sectional view of a second example of the first embodiment. In this example, a pair of light channel steels 12a and 12b are back-to-back and a web is abutted and joined by spot welding to form an H-shaped section, and a structural plywood 15 which is a face material is formed on one surface of the web. The composite beam 1B is formed by joining with a screw 21. In addition, if necessary, face material 1
5 may be joined.

In the embodiment, web height: 237 mm, flange width: 40 mm, plate thickness: 1.0 mm (hereinafter, U-237 ×
40 × 1.0) of the light channel steels 12a and 12b are joined by spot welding, and a structural plywood 15 having a height of about 235 mm is brought into contact with one surface of the web portion. Two screws 21 are driven in the longitudinal direction from the side and are inserted at an interval of 300 mm in the longitudinal direction to be integrated. Less than,
It is similar to the case of the first side.

[Embodiment 2] FIG. 3 shows Embodiment 2 of the present invention.
FIG. 4 is a cross-sectional view of the first example. In this example, a pair of lip channel steels 11a and 11b are back-to-back, a structural plywood 15 as a face material is sandwiched between the webs, and the web and the structural plywood 15 are integrally joined with screws 21. This is a composite beam 1C having an H-shaped cross section.

In the embodiment, C-235 × 40 × 20 ×
A structural plywood 15 having a height of about 235 mm is sandwiched between webs of 1.0 lip channel steels 11a and 11b, and two screws 21 are driven in the longitudinal direction and 300 mm in the longitudinal direction to be integrated. . In this case, the lip channel steels 11a and 11b and the structural plywood 15 may be joined by bolts or other means.
Other face materials may be used instead of the structural plywood 15.

The composite beam 1C thus assembled
Are installed on the upper frame of the vertical frame constituting the load-bearing wall arranged at intervals on the same line, and are joined by screws. Then, a floor material is laid on the composite beam 1C,
It is joined to the composite beam 1C by screws from the upper surface, and the lower frame of the vertical frame constituting the upper floor bearing is further screwed and attached thereto.

FIG. 4 is a sectional view of a second example of the second embodiment. In this example, a pair of light channel steels 12a and 12b are back to back, and a structural plywood 15 as a face material is provided between the webs.
, And the web and the structural plywood 15 are integrally joined by screws 21 to form a composite beam 1D having an H-shaped steel cross section. In the embodiment, two screws 21 in the longitudinal direction and two screws 21 in the longitudinal direction are sandwiched between the structural plywood 15 having a height of about 235 mm between the webs of the light channel steels 12a and 12b of U-237 × 40 × 1.0. Were integrated at 300 mm intervals. In this case, the light channel steels 12a and 12b and the structural plywood 15 may be joined by bolts or other means, and the face material other than the structural plywood may be used. Hereinafter, it is the same as the case of the first example.

[Embodiment 3] FIG. 5 shows Embodiment 3 of the present invention.
FIG. 4 is a cross-sectional view of the first example. This example corresponds to the first embodiment of the first embodiment.
In order to improve the strength of the composite beam 1A of the example (FIG. 1),
A composite beam 1E having a box-shaped cross section is configured by combining light channel steels 12a and 12b of the same size series. In the example, the first example of the first embodiment is C-235 × 40 × 20.
× 1.0 lip channel steel 11a, 11b, U-2
37 × 40 × 1.0 light channel steels 12a, 12b are fitted on both sides (or one side) of the composite beam 1A with the web facing out,
The upper and lower flanges were integrally joined by screws 21 respectively.

FIG. 6 is a sectional view of a second example of the third embodiment. This example is a composite beam 1 of the second example (FIG. 2) of the first embodiment.
B: Lip channel steels 11a and 11b of the same dimension series
Are combined to form a composite beam 1F having a box-shaped cross section. In the example, a U-237 ×
Using light channel steels 12a and 12b of 40 × 1.0, C-2
35x40x20x1.0 lip channel steel 11a, 11
b on both sides (or one side) of the composite beam 1B with the web on the outside
And the upper and lower flanges were integrally joined by screws 21. In each of the first and second examples, if necessary, a surface material such as a structural plywood having a height of about 235 mm may be further bonded to the other surface of the web of the composite beams 1A and 1B. Good.

[Embodiment 4] FIG. 7 shows Embodiment 4 of the present invention.
FIG. 4 is a cross-sectional view of the first example. This example corresponds to the first embodiment of the second embodiment.
In order to further improve the strength of the composite beam 1C of the example (FIG. 3), a composite beam 1G having a box-shaped cross section is formed by combining light channel steels 12a and 12b of the same size series. In the example, the first example of the second embodiment is C-235 ×
U-237 × 40 × 20 light channel sections 12a, 12b using lip channel sections 11a, 11b of 40 × 20 × 1.0.
Was fitted on both sides (or one side) of the composite beam 1C with the web facing outward, and the upper and lower flanges were integrally joined with screws 21 respectively.

FIG. 8 is a sectional view of a second example of the fourth embodiment. This example is a composite beam 1 of the second example (FIG. 4) of the second embodiment.
In order to further improve the strength of D, a composite beam 1H having a box-shaped cross section is configured by combining lip channel steels 11a and 11b of the same size series. In the example, U-237 × 40 × 1.0 light channel steels 12a and 12b are used in the second example of the second embodiment, and C-235 × 40 × 20 ×
The 1.0 lip channel steels 11a and 11b were fitted on both sides (or one side) of the composite beam 1D with the web facing outward, and the upper and lower flanges were joined with screws 21 respectively. In each of the first and second examples, if necessary, a face material such as a structural plywood having a height of about 195 mm may be joined to both sides or one side of the web of the composite beams 1G and 1H. Good.

As described above, in the present invention, a beam member having any rigidity and strength can be obtained by joining a face member having any strength and rigidity to the web portion. In particular, by attaching a surface material having excellent strength and rigidity, the stiffening of the web is made effective, and a reduction in the strength due to the elastic buckling of the web is prevented, so that a beam member with high rigidity and strength is obtained. In the case where the face material is sandwiched between the webs, a strong beam member can be obtained by the same process as the assembly beam using only a normal steel material.

[Embodiment 5] FIG. 9 shows Embodiment 5 of the present invention.
This will be described with reference to FIG. In this embodiment, the composite beams 1C, 1D, 1G, and 1H of the above-described Embodiment 2 (FIGS. 3 and 4) or Embodiment 4 (FIGS. 7 and 8) are used.
An anchor bolt 32 that rises from the foundation or a shaft bolt 33 that connects the upper and lower floors is made to penetrate through G (the composite beam 1G will be described below as an example).

In the figure, reference numeral 35 denotes a vertical frame constituting, for example, a lip channel steel and constituting a bearing wall of a lower floor which is erected on the same line and spaced apart from each other and has a light channel steel at an upper end thereof. An upper frame 36 is attached by screws. Reference numeral 40 denotes a hole-down metal member screwed to the web of the vertical frame 35. 1G is a composite beam bridged on the vertical frame 35 via the upper frame 36. In the present embodiment, the composite plywood 15 constituting the face material is formed of a composite beam having a thickness larger than the outer diameter of the shaft bolt 33 used. As shown in FIGS. 11 and 12, the shaft bolt 3
The space portion 16 is provided by making the portion through which 3 penetrates discontinuous.

The lower flange of the composite beam 1G is joined to the upper frame 36 by screws, and a floor plywood 37 constituting an upper floor is laid on the upper flange. And on top of that,
The lower frame 39 is screwed to the lower end, and the hole-down hardware 40 is fixed to the web, and the vertical frame 3 which forms the load-bearing wall on the upper floor is formed.
8 is installed.

Next, between the hole-down hardware 40 attached to the vertical frames 38 and 35 on the upper and lower floors, the upper frame 36 on the lower floor, the space 16 provided on the structural plywood 15 of the composite beam 1G, and the floor plywood 3
The shaft bolt 33 is inserted into the lower frame 39 of the upper floor 7 and the upper floor, fixed with a nut, and integrally connected. Thereby, the vertical frames 38 and 35 constituting the bearing walls of the upper and lower floors can be integrally connected via the composite beam 1G.

In this case, for example, if the interval is set to 1600 mm using the M9 shaft bolt 33, the length is 158 mm.
A space portion 16 is formed on the structural plywood 15 having a thickness of about 0 mm and a thickness of 9 mm or more at an interval equal to or more than the outer diameter of the shaft bolt 33, and the lip channel steels 11a and 11b or the light channel steels 12a and 12b are formed.
Of composite beams 1C, 1D, 1G, 1H
May be configured.

FIG. 13 shows that the composite beam 1C (or 1D, 1G, 1H) according to the present embodiment is laid on the foundation 31 as a base, and the anchor bolt 32 is inserted into the space 16 of the structural plywood 15 so as to extend vertically. Hole-down hardware 40 provided on the frame 35
It is fixed to. Reference numeral 36a is a lower frame attached to the lower end of the vertical frame 35.

In the above description, the case where the structural plywood 15 is used as the face material constituting the composite beams 1A to 1H has been described. However, the present invention is not limited to this, and the structural panel, the gypsum board, A face material used in general construction, such as a calcium silicate board, an ALC, and an extruded cement board, can be arbitrarily selected according to the purpose. Further, a material having a damping property such as a glass wool board, a rock wool board, and a sizing board may be used.

Further, in the above embodiment, the composite beam according to the present invention is mainly bridged on the upper frame of the vertical frame constituting the load-bearing wall arranged at intervals on the same line.
Although the case where the vertical frame forming the load-bearing wall of the upper floor is mounted thereon is shown, the present invention is not limited to this.For example, when there is no load-bearing wall at the top, when the floor span is large, Can be used for all the parts that normally need to be reinforced, for example, when reinforcing the openings of the above. Also, the joists can be mounted orthogonally to the composite beam according to the present invention via mounting hardware typified by angles.

[0039]

According to the composite beam of the present invention, a pair of lip channel steels or light channel steels are back-to-back, and a face material is brought into contact with at least one surface of the web, and the face material and the web are integrally joined. Alternatively, a pair of lip channel steels or light channel steels are back-to-back, the face material is sandwiched between the webs, and the web and the face material are integrally joined, so that the following effects can be obtained. .

By joining a face member having an arbitrary strength and rigidity to the web portion, a composite beam having an arbitrary rigidity and strength can be obtained. In particular, by attaching a surface material with excellent strength and rigidity, the stiffening of the web is made effective and the reduction of the proof stress due to the elastic buckling of the web is prevented.
A composite beam with high proof stress can be obtained. Further, when the face material is sandwiched between the webs, a strong composite beam can be obtained by the same process as the assembly beam using only ordinary steel materials. Further, when a material having a damping property is used for the face material, it is possible to reduce the cracking sound of the joists caused by the vibration of the floor.

Further, since a space is provided in the longitudinal direction of the face material sandwiched between the webs so that the face material is formed discontinuously and a shaft bolt or the like is inserted therein, the connection of the upper and lower floors by the shaft bolt, the anchor, The connection between the foundation and the composite beam by bolts becomes possible, and vertical stress transmission can be performed without any problem in interior finishing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first example of the first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a second example of the first embodiment.

FIG. 3 is a cross-sectional view of a first example of Embodiment 2 of the present invention.

FIG. 4 is a cross-sectional view of a second example of the second embodiment.

FIG. 5 is a cross-sectional view of a first example of Embodiment 3 of the present invention.

FIG. 6 is a cross-sectional view of a second example of the third embodiment.

FIG. 7 is a cross-sectional view of a first example of Embodiment 4 of the present invention.

FIG. 8 is a cross-sectional view of a second example of the fourth embodiment.

FIG. 9 is a front view showing the overall configuration of Embodiment 5 of the present invention.

FIG. 10 is a sectional view taken along line AA of FIG. 9;

FIG. 11 is a plan view, a front view, and a side view of the composite beam of FIG. 10;

FIG. 12 is a perspective view of FIG. 11;

FIG. 13 is a front view of another example of the fifth embodiment.

FIG. 14 is a sectional view showing an example of a joist of a conventional steel house.

FIG. 15 is a sectional view showing another example of a joist of a conventional steel house.

FIG. 16 is a cross-sectional view of an example of a conventional stiffened joist.

FIG. 17 is a cross-sectional view of another example of a conventional stiffened joist.

FIG. 18 is a cross-sectional view showing a conventional connection structure of upper and lower floors.

FIG. 19 is a side view of FIG. 18;

FIG. 20 is an explanatory view showing a state where a wall base material is attached to FIG. 18.

[Explanation of symbols]

 1A to 1H Composite beam 11a, 11b Rip channel steel 12a, 12b Light channel steel 15 Structural plywood (face material) 16 Space 31 Anchor bolt 33 Shaft bolt

Claims (3)

[Claims] 1. A pair of lip channel steel or light channel steel is back-to-back, a face material is brought into contact with at least one surface of the web, and the face material and the web are integrally joined. Composite beams. 2. A composite beam wherein a pair of lip channel steels or light channel steels are back to back, a face material is sandwiched between the webs, and the web and the face material are integrally joined. 3. The composite beam according to claim 2, wherein a space is formed in the longitudinal direction of the face material so that the face material is discontinuous and a shaft bolt or the like is inserted therethrough.