JPH1037382A - Wooden truss beam using steel product for lower chord member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce weight and decrease cost by fitting a plurality of post members perpendicular to an upper chord member made of wood, fitting a wooden material serving both as a horizontal buckling preventing material and a furring strip receiving material between the lower ends of the post members, stretching reinforcements between the lower ends of the post members and between the post members and the upper chord member, and adding tension to the reinforcements. SOLUTION: A plurality of post members 2 are squarely joined to an upper chord member 1 made of wood, a wooden material 3 serving both as a horizontal buckling preventing material and a furring strip receiving material is fitted to the lower ends of the post members, and reinforcements 4 as lower chord members are stretched between the lower ends of the post members 2. A wooden truss beam is assembled by stretching diagonal reinforcements 5 between the lower ends of the post members 2 and both ends of the upper chord member 1. By tightening double nuts stretching the reinforcements 4, 5, tension is given to the reinforcements 4, 5. Hereby, sectional performance against tension and compression can be sufficiently secured, and a wooden truss beam of low cost, high strength, small sectional area, light weight, and good air permeability can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam mainly made of wood or steel used for prefabricated wooden houses or the like, and more particularly to a steel bar used for a lower chord and a tension applied to the steel bar. Wooden truss beams.

[0002]

2. Description of the Related Art A beam used for a wooden or wooden prefabricated house is desirably a wooden beam in consideration of the relationship with other components, but the span is 3,640 mm (12 mm).
If the length exceeds the length, problems arise in terms of strength, cost, and the like. That is, it is difficult to obtain a long wooden timber with a single piece, and a method of forming a laminated timber is conceivable. However, there is a problem that the cost increases. In addition, when used as a simple beam, the length of the beam becomes longer, so the cross-sectional area must be increased, and there is a problem that the weight becomes heavy. There is a problem that the number of joints between the material and the lattice material increases, and the work becomes difficult.

[0003] On the other hand, although a string beam in which a steel beam is reinforced with a wooden beam is conventionally used, it is merely an improved form of the strength of a simple beam, and accurate peeling accuracy of the beam cannot be obtained. And so on. In addition, H-shaped wooden beams have been developed. However, in the case of snow-free roofs (M-type roofs), which are mainly used in cold regions, the ventilation of the back of the shed deteriorates, so they are used too much. It is not the fact.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wooden truss beam using steel as a lower chord material having low cost, high strength, small cross section, light weight, and air permeability. Is to do. Another object of the present invention is to provide a wooden truss beam using a steel material for a lower chord member capable of obtaining accurate beam peeling accuracy. A further object of the present invention is to obtain a wooden truss beam using a steel material for a lower chord material that can contribute to speeding up work.

[0005]

In order to solve the above-mentioned problems, a wooden truss beam using steel for the lower chord according to the present invention is provided by attaching a plurality of bundles at right angles to a wooden upper chord, and A wooden material that also serves as a lateral buckling prevention material and a field support material is attached between the lower ends of the materials, and a reinforcing material is stretched between the lower ends of the bundle material and between the bundle material and the upper chord material, and tension is applied to the reinforcing material. It is characterized by having a wooden truss beam that is prestressed to the reinforcing steel material to be the lower chord material and the reinforcing steel material stretched between the bundle material and the upper chord material,
It is possible to accurately adjust the peeling accuracy of the upper chord material while ensuring sufficient cross-sectional performance against tension and compression.

Further, in the wooden truss beam using a steel material for the lower chord material according to the present invention, a reinforcing steel material stretched between lower ends of the bundle material is stretched between the bundle materials one inside of both ends of the upper chord material,
It is characterized in that a reinforcing bar is stretched obliquely between the lower end of the bundle and the both ends of the upper chord, and the tension can be divided and adjusted by both reinforcing bars. It is possible to secure the slenderness, and also to secure the peeling of both ends of the upper chord material by adjusting the tension of the oblique reinforcing bar material, and to finely adjust the peeling of the beam.

Further, in the wooden truss beam using a steel material for the lower chord according to the present invention, a plywood is attached to both surfaces of the upper chord and the bundle at both ends of the upper chord, and the upper chord between the bundles. A truss-structured plywood is fitted and installed between the truss and the wooden material. By attaching these plywoods, the performance of the wooden truss beam in terms of strength can be further improved.

Further, in the wooden truss beam using a steel material for the lower chord material according to the present invention, metal fittings which are in contact with the side surfaces of the bundle material are attached to both ends of a reinforcement material stretched between lower ends of the bundle material, A double nut is screwed into threaded portions provided at both ends to apply tension to the rebar material, and one end of an oblique rebar material between the bundle material and the upper chord material is connected to the metal fitting, and the oblique rebar material is connected to the metal fitting. It is characterized by being tensioned, by tightening the metal fittings attached to both ends of the reinforcing steel material that will be the lower chord with double nuts, the tension of the steel reinforcing material can be easily adjusted, and By connecting one end of the reinforcing bar, the oblique reinforcing bar can be easily stretched.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
7 will be described with reference to FIG. FIG. 1 is an overall configuration diagram of a wooden truss beam using a steel material for a lower chord according to an embodiment of the present invention, and FIG. 2 is a side view (A) and an enlarged view of an end portion (B) of a reinforcing steel material serving as the lower chord. , FIG. 3 is a side view of the diagonal reinforcing bar, FIG. 4 is a side view (A) and a front view (B) of a bracket for mounting the reinforcing bar, and a perspective view showing an attached state, and FIG. FIG. 6 is a plan view (A) and a front view (B) of a backing plate for attaching an oblique reinforcing bar, and FIG. 7 is a side view of a plywood of a truss structure which is fitted and installed between a chord member and a wooden member. FIG.

As shown in FIG. 1, a wooden truss beam is made of a wooden upper chord 1 having a predetermined length, and a plurality of wooden truss beams are attached at regular intervals along the longitudinal direction of the upper chord 1 at right angles. 5), a wooden material 3 attached between the lower ends of the bundles 2 and also serving as a lateral buckling prevention material and a field edge receiving material, and three inner bundles excluding the bundles 2 at both ends. A reinforcing steel member 4 serving as a lower chord material stretched between lower ends of the bundle material 2 and an oblique rebar material 5 stretching between a lower end of the bundle material 2 located inside the bundle material 2 at both ends and both ends of the upper chord material 1; Consists of

The bundle 2 is joined to the upper chord 1 by means of a bond and a nail, so that the bundle 2 is not displaced even if it receives a compressive load. Reinforcing material 4, which is the lower chord material,
As shown in FIG. 2, a round bar made of steel is used, and a screw 6 is cut at both ends. A different color 6a and a color 6b are applied to the screw 6 to apply tension to the reinforcing bar 4. At this time, by tightening a double nut 13 described later using the colors 6a and 6b as a guide, it is possible to always apply a constant tension and to tension the rebar 4.

As shown in FIG. 3, a steel round bar is used for the diagonal reinforcing bar 5 as shown in FIG. 3, and a screw 7 is cut at one end and a connecting bracket 8 is integrally attached to the other end. It has a configuration. The screw 7 at the end of the oblique reinforcing bar 5
Also, by applying a different color similarly to the screw 6 of the reinforcing bar 4, it can be used as a guide when tightening a double nut 18 described later.

FIG. 4 shows a metal fitting 9 for stretching the reinforcing bar 4 and the oblique reinforcing bar 5. The metal fitting 9 has a hole 11 through which both ends of the reinforcing bar 4 pass through a vertical surface 10 which is in contact with the side surface of the bundle 2.
A lower part thereof is bent at a right angle, and a connecting part 12 extending obliquely upward to connect the connecting fitting 8 of the oblique reinforcing bar 5 is provided at an upper part.
The reinforcing bar 4 can be stretched by passing both ends of the reinforcing bar 4 through the holes 11 and tightening with the double nuts 13.

The connecting portion 12 of the metal fitting 9 includes the upper chord material 1.
The oblique reinforcing bar material 5 stretched between the end portions is connected via a connection fitting 8. Both ends of the upper chord material 1
As shown in FIG. 5, a hole 15 is cut obliquely, and a hole 15 through which the oblique reinforcing material 5 passes obliquely from an end face 14 is provided. The end face 14 has a U-shaped cross section as shown in FIG.
A double metal nut 18 is screwed into a screw 7 cut at the end of the slanted reinforcing material 5 by applying a metal plate 17 having a metal plate 6 to the screw 5.

Further, plywoods 19 and 20 as shown by oblique lines in FIG. 1 are attached to the vicinity of the center of the upper chord 1 and to both sides of the bundle 2 attached to both ends of the upper chord 1, respectively. A trussed plywood 2 having a truss structure as shown in FIGS.
By fitting and installing No. 1, the performance of the wooden truss beam in terms of strength is improved.

In the wooden truss beam, a plurality of bundles 2 are connected to a wooden upper chord 1 at equal intervals, and a wooden member 3 is attached to a lower end of the bundle 2 and a bundle 2 is provided. Is assembled by stretching a reinforcing bar 4 as a lower chord between the lower ends of the bundles, and further stretching an oblique reinforcing bar 5 between the lower end of the bundle 2 and both ends of the upper chord 1 so that the reinforcing bar 4 and the oblique reinforcing bar 5 are stretched. By tightening the nuts 13 and 18, tension can be applied to the reinforcing bar 4 and the oblique reinforcing bar 5.

Here, by tightening the double nut 13, the central portion of the upper chord material 1 is secured, and by tightening the double nut 18, the upper chord material 1 is tightened.
Of the two ends can be secured. At this time, by tightening the double nut 13 using the different colors 6a and 6b applied to the screws 6 cut at both ends of the reinforcing bar 4 as a guide, the reinforcing bar 4 is always tensioned by applying a constant tension. Therefore, accurate beam peeling accuracy can be ensured. The same applies to the case of tightening the double nut 18 that stretches the oblique reinforcing bar 5.

Therefore, according to the above wooden truss beam, by using the wooden upper chord 1 and the reinforcing bar 4 as the lower chord, a long and high-strength wooden truss beam having a small cross-sectional area can be manufactured at low cost. Since it can be manufactured and the cross-sectional area can be reduced, it is possible to obtain a light-weight wooden beam having a truss structure and air permeability. For this reason, it can be applied to ensuring the air permeability behind the hut even for snow-free roofs (M-type roofs) that are mainly used in cold regions.

Further, since the peeling of the upper chord material 1 can be finely adjusted, the peeling accuracy of the beam can be remarkably improved. Furthermore, since the wooden material 3 which also serves as a lateral buckling prevention material and a field edge receiving material is attached to the lower end of the bundle material 2, it is possible to receive a ceiling panel or the like, thereby speeding up the construction. . In addition, this wooden material 3
Does not need to share the function of wooden truss beams as strength members.

[0020]

As described above, according to the wooden truss beam using steel for the lower chord according to the present invention, the lateral buckling occurs between the lower ends of a plurality of bundles attached at right angles to the wooden upper chord. By attaching a wooden material that also serves as a preventive material and a ridge receiving material, a reinforcing steel material is stretched between the lower end of the bundle material and between the bundle material and the upper chord material, and by using a wooden truss beam that adds prestressed to this reinforcing material, A wooden truss beam having sufficient cross-sectional performance against tension and compression to obtain a wooden truss beam having low cost, high strength, small cross-sectional area, light weight, and air permeability. be able to. In addition, by adjusting the tension of the rebar material, it is possible to obtain accurate peeling accuracy of the beam,
Since a wooden material that also serves as a lateral buckling prevention material and a field edge receiving material is attached between the lower ends of the bundles, it is possible to receive a ceiling panel or the like and thereby speed up the construction.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a wooden truss beam using a steel material for a lower chord material according to an embodiment of the present invention.

FIGS. 2A and 2B are a side view (A) and an enlarged view (B) of an end portion of a reinforcing steel material serving as a lower chord of a wooden truss beam using steel as a lower chord of the present invention.

FIG. 3 is a side view of an oblique reinforcing bar of a wooden truss beam using a steel material for a lower chord according to the present invention.

FIG. 4 is a side view (A), a front view (B), and a perspective view (C) showing a mounting state of a bracket for mounting a reinforcing member of a wooden truss beam using steel as a lower chord member of the present invention.

FIG. 5 is an enlarged view showing a configuration of an end portion of an upper chord material of a wooden truss beam using a steel material for a lower chord material of the present invention.

FIGS. 6A and 6B are a plan view (A) and a front view (B) of an abutment for attaching a diagonal reinforcing member of a wooden truss beam using steel as a lower chord according to the present invention.

FIG. 7 is a side view of a plywood of a truss structure which is fitted and installed between an upper chord member and a wooden member of a wooden truss beam using steel as a lower chord member of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper chord material 2 Bundle material 3 Wooden material 4 Reinforcement material 5 Diagonal reinforcement material 6 Screw 9 Metal fitting 13 Double nut 19, 20, 21 Plywood

Claims (4)

[Claims] 1. A plurality of bundles are attached at right angles to a wooden upper chord, and a wooden material which also serves as a lateral buckling prevention member and a field edge receiving member is attached between lower ends of the bundles. A wooden truss beam using steel as a lower chord material, wherein a reinforcing steel material is stretched between the bundle material and the upper chord material, and the reinforcing steel material is given tension. 2. A reinforcing bar stretched between the lower ends of the bundles is stretched between the bundles one inner side of both ends of the upper chord, and is slanted between the lower ends of the bundles and both ends of the upper chord respectively. The wooden truss beam using a steel material for the lower chord material according to claim 1, wherein the truss member is made of steel. 3. A plywood is attached to both sides of the upper chord material and the bundle material at both ends of the upper chord material, and a truss structure plywood is fitted and installed between the upper chord material and the wooden material between the bundle materials. The wooden truss beam using a steel material for the lower chord material according to claim 1 or 2, characterized in that: 4. A metal fitting in contact with the side surface of the bundle material is attached to both ends of the reinforcing material stretched between the lower ends of the bundle material, and a double nut is screwed into a screw portion provided at both ends of the reinforcing material, and 4. A tension is applied to the bracket, and one end of an oblique reinforcing bar between the bundle member and the upper chord is connected to the metal fitting, and the oblique reinforcing bar is stretched. Wooden truss beam using steel for lower chord.