JPH1061001A - Connection part structure of truss structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen an amount of deviation of a truss member main shaft to prevent lowering of strength of a truss member and eliminate bending working in the connection end of a conventional truss member in a case where a planar member is used for a connection part metal fitting arranged at the joint of a curved-face frame, the joint of a cylindrical frame, the ridge part and the side beam part of a gabled roof frame and the like. SOLUTION: In the connection part structure of a truss structure, a plurality of truss members 2 for a connection part metal fitting 1 arranged in the joint of a truss frame are inclined at a set angle θ in the direction of thickness of the connection metal fitting and disposed. In the case, the connection part metal fitting 1 of each truss member 2 is fed up to the limit in which a splice plate 7 can be connected toward center of the connection metal fitting 1 to be disposed, each truss member 2 is abutted on the rib plate 5 of the connection part metal fitting as it remains inclined at the set angle θ so that the connection line 9 of the connection part metal fitting 1 and each truss member 2 is inclined by viewing from the side. Bent splice plates 6, 7 are connected in a flange part in the connection end of the connection part metal fitting 1 and the truss member 2 and tightened by bolts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a truss structure such as a single-layer or multi-layer roof truss such as a gymnasium or a factory.

[0002]

2. Description of the Related Art The applicant of the present invention manufactures a truss structure using a shaped steel according to Japanese Patent Application No. 8-82567 "curved frame" and Japanese Patent Application No. 8-111524 "cylindrical or angled frame". Application for technology.

The main point of the technology is disclosed in Japanese Patent Application No. 8-825.
In No. 67, bending or torsional deformation is applied to a truss main material constituting a curved frame structure, or bending and torsional deformation are applied to a joint metal part to form a joint. This eliminates the need for extra work and enables joining with a flat splice plate.

[0004] In Japanese Patent Application No. 8-111524, a bent inclined portion is formed on a joint metal fitting disposed at a ridge portion and a side beam portion of a roof truss having a cylindrical or mountain frame. By applying torsion deformation etc. in advance to the oblique truss main material to be joined to the bent inclined part, unnecessary work such as bending work is not required for the joint hardware forming the joint,
This enables joining by a flat splice plate.

FIG. 5 shows an example of a joint structure of a truss member in a curved frame. A plurality of truss members 54 are connected to a joint fitting 50 arranged at a node of the curved frame.
Are arranged at an inclination angle θ in the vertical direction. The joint metal part 50 includes a disc-shaped upper and lower top plates 51 and 52, and a rib plate 53 disposed radially between the plates in a plan view corresponding to the truss member 54.

[0006] The truss member 54 is subjected to torsional deformation as required (when the center perpendiculars of both connecting metal fittings are not in the same plane), and then the bending is performed to the connecting end to join. A bent portion 55 that is linearly continuous with the metal fitting 50 is formed.
Upper and lower top plates 51 and 52 at the joint end
And the flange 55f of the bent portion 55 are bolted to each other through a flat splice plate 56 to form a rib plate 53.
And the web 55w of the bent portion 55 are connected to the splice plate 5
7 are bolted together.

[0007]

In the case of the above-mentioned conventional metal fittings, although the upper and lower top and bottom plates are flat and easy to manufacture, there is an advantage that standardization and commonality are easy, but the joining end of the truss member 54 is easy. for providing the bent portion 55 in section, a distance d from the center point O of the joint fittings 50 to bend point 58 is increased, the main axis L of the truss member 54 relative to the reference line L ₀ passing between junctions hardware center point O Is excessively large, the allowable compressive axial force of the truss member 54 is significantly reduced, and the compressive strength of the truss member, that is, the truss frame is greatly reduced. If the size of the truss member is increased to cope with this, the weight of the truss frame increases, and the processing cost increases. Further, in manufacturing, a large number of truss members need to be bent, which increases the processing cost and makes it difficult to perform accurate processing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a ridge and a side where a curved surface or a plane of a cylindrical frame or a mountain-shaped frame changes. When a flat metal fitting is used at a joint of a beam, etc., the eccentricity of the truss member main shaft with respect to a reference line passing between the joint hardware center points is reduced to reduce the strength of the truss member. An object of the present invention is to provide a joint structure of a truss structure that can prevent the occurrence of bending at the joint end of the conventional truss member.

[0009]

The present invention is applied to a node of a curved frame or a node of a ridge portion or a side beam portion where a curved surface or a plane of a cylindrical frame or a mountain-shaped frame changes, and FIG. As shown in the curved frame of FIG. 2, a plurality of truss members 2 are arranged at an angle θ in the thickness direction of the joint hardware, with respect to the joint hardware 1 arranged at the node of the truss frame. In a joint structure in which the ends of the truss members 2 are bolted to the ends of the joint hardware 1 via the splice plates 6, 7, 8, respectively, as shown in FIG. The ends are fed toward the center of the metal joint 1 to the limit that the splice plate 7 can be attached, and each truss is inclined so that the joint line 9 between the metal joint 1 and each truss member 2 is inclined from the side. The member 2 is inclined at the above-mentioned angle θ. Rib plate 5 of the joint hardware 1
Then, the spliced plates 6 and 7 which are bent are attached to the flange portion at the joint end of the joint metal part 1 and the truss member 2 and bolted.

In the above-described configuration, since each truss member 2 is joined to the joint fitting 1 while being inclined at the joint angle θ, the conventional bent portion at the end of the truss member can be eliminated. By further arranging the truss member 2 toward the center point O of the joint hardware 1 as much as possible,
The size of the metal joint 1 can be made approximately the same as that of the related art, and the distance d from the center point O of the metal joint 1 to the bending point 10 can be significantly reduced as compared with the related art. As a result, the eccentric amount δ of the main axis L of the truss member with respect to the reference line L ₀ passing between the joint metal center points O is reduced, and the allowable compressive axial force of the truss member 2 is prevented from lowering. Strength can be improved. In addition, the conventional metal plate 1 can be used as the metal joint 1 and the conventional bending at the end of the truss member 2 becomes unnecessary.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. This is an example applied to a joint structure of a curved frame of a single-layer truss. 1 and 2 show a plan view and a side view of a joint structure of a curved frame according to the present invention.

In FIGS. 1 and 2, a joint hardware 1 is disposed at a node of a curved frame, and a plurality of ends of the truss member 2 from other joint hardware (not shown) are provided at an end of the joint hardware 1. (In this case, six truss members 2 are joined, and each truss member 2 is arranged at an inclination angle θ in the vertical direction with respect to the joint hardware 1 (see FIG. 2).

The metal joint 1 is composed of a disc-shaped upper top plate 3 and a lower top plate 4, and rib plates 5 arranged radially in plan view between the plates so as to correspond to the truss members 2. . Upper and lower roof plates 3 and 4 and truss member 2
The upper and lower flanges 2f, 2f are bolted via upper and lower splice plates 6, 7, respectively, and the rib plate 5 and the web 2w of the truss member 2 are bolted via a splice plate 8. .

In such a joint structure, in the present invention, the joint end of each truss member 2 is fed as far as possible toward the center point O of the joint hardware 1 and the joint end of each truss member 2 is arranged. The truss member 2 is kept straight without providing a conventional bent portion,
To join. Therefore, when the metal joint 1 is viewed from the side, the joint line 9 between the rib plate 5 and the web 2w of the truss member 2 is inclined at an angle θ with respect to the vertical, and is lower than the upper top plate 3. The top plate 4 becomes a small-diameter disk.

Each truss member 2 is connected to the center point O of the joint hardware 1.
Is limited by the lower splice plate 7, and the truss members 2 are fed as far as possible so that the tip corners of the splice plate 7 do not overlap. As a result, the diameter of the lower top plate 4 becomes the same as the diameter of the lower top plate 52 of the conventional joint hardware of FIG. 5, and the overall size of the joint hardware 1 does not increase so much.

Since the joint hardware 1 and each truss member 2 are joined at an inclined angle θ, the upper and lower splice plates 6 and 7 used are bent.
Although FIG. 2 shows a case where the bending is performed by a straight line, the bending may be performed by a curve. In this case, the splice plate 6,
7, and a rounding process is performed on the joint end portions of the joint hardware 1 and the truss member. The intermediate splice plate 8 is disposed parallel to the main axis L of the truss member 2 and is disposed obliquely with respect to the rib plate 5.

Each truss member 2 does not need to be subjected to torsional deformation when the center perpendiculars of the two connecting metal fittings are in the same plane, but when not in the same plane. By applying torsional deformation, the upper and lower top plates 3 and 4 and the splice plate contact surfaces of the upper and lower flanges 2f of the truss member 2 are flush with each other.

FIG. 3 shows the truss member 2 having a size of H-300 × 150 × 6.
This is a specific example of a joint when a 5 × 9 H-section steel is used. The distance d from the joint metal center point O to the bending point 10 or 58 is 700 mm in the case of the conventional joint metal 50.
On the other hand, in the metal joint 1 of the present invention, 370 mm
And can be greatly reduced. The eccentric amount δ of the main axis L of the truss member with respect to the reference line L ₀ passing between the joint metal center points O is represented by d × sin θ.
Where δ = 122 mm conventionally,
In the present invention, δ can be reduced to 64 mm.

If the amount of eccentricity δ is large, the allowable compressive axial force of the truss member decreases, but in the present invention, the amount of eccentricity can be reduced, so that the allowable compressive axial force of the truss member 2 is improved (ideal reference). Approaching the allowable compression axial force of the line L ₀ )
The compressive strength of the truss member 2 increases as compared with the conventional case. FIG.
Shows an H-300 × 150 × 6.5 × 9 H-section steel with an elongation ratio λ = 60 (λ = I _k / i, I _k : buckling length,
i: rotational radius) is a graph comparing the allowable compressive axial force of the member and the reduction coefficient of the allowable compressive axial force of the member when the distance d from the joint metal center point O to the bending point 10 is used as a parameter. As can be seen from this figure, as long as the coupling angle θ is the same, the smaller the distance d, that is, the smaller the amount of eccentricity δ, the smaller the decrease in allowable compression axial force (θ =
In the case of 9 °, about 45% [d = 800 mm] is about 62%
[D = 400 mm]), it can be seen that the allowable compressive axial force of the truss member, that is, the compressive strength is improved.

In manufacturing, the splice plates 6 and 7 need to be bent, and the joining end face of the rib plate 5 of the joint fitting 1 must be cut obliquely according to the joining angle θ. Conventional flat plates can be used for the top and bottom plates 3 and 4 of the hardware 1, and the conventional bending at the ends of the truss members 2 provided in a large number becomes unnecessary, thereby greatly reducing the processing cost. Can be. Further, since the truss member 2 does not have the bent portion 55 as in the related art, the truss member 2 can be processed with high accuracy.

Although the above description has been made with respect to a curved frame, the present invention can also be applied to a metal joint at a ridge and a side beam of a cylindrical frame or a mountain-shaped frame. In addition, Japanese Patent Application No. Hei 8-1115
In No. 24, a bent inclined portion is formed in the joint hardware. However, in the case where the present invention is applied, the oblique truss member is formed on the flat joint metal member without providing the bent inclined portion. Adopt a structure that directly joins.

Further, in the above embodiment, the truss member is an H-shaped steel, but is not limited thereto.
It goes without saying that a section steel such as a T section steel or an angle section steel is used. Furthermore, the above shows the case of a single-layer truss,
Needless to say, it can be applied to a multi-layer truss.

[0023]

Since the present invention has the above configuration, the following effects can be obtained.

(1) Each truss member is joined to the joint hardware in a straight state to eliminate the conventional bent portion, and furthermore, the truss member is fed and arranged as far as possible toward the center point of the joint hardware to join the joint hardware. Can be made approximately the same size as before, so that the distance from the center point of the joint hardware to the bending point can be significantly reduced compared to the past, and the amount of eccentricity of the truss member main shaft is reduced. be able to. As a result, the allowable compressive axial force of the truss member can be prevented from lowering, and the compressive strength of the truss frame can be greatly improved as compared with the related art.

(2) A conventional flat plate can be used as the metal joint, and the conventional bending at the end of the truss member is not required, so that the processing cost can be greatly reduced and the cost can be reduced. At the same time, truss members can be processed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a joint portion structure of a truss structure according to the present invention.

2A is a side view of the joint structure of FIG. 1, and FIG. 2B is a cross-sectional view of the truss member of FIG.

3A and 3B are side views showing a specific example of a joint structure of a truss structure, wherein FIG. 3A is the present invention and FIG. 3B is a conventional example.

FIG. 4A is a graph showing an allowable compression axial force of a member,
(B) is a graph which shows the reduction coefficient of the allowable compression axial force of a member.

FIG. 5 is an example of a joint structure of a conventional truss structure,
(A) is a plan view, (b) is a side view, and (c) is a cross-sectional view.

[Explanation of symbols]

L ... spindle L ₀ ... reference line theta ... Togo angle O ... distance [delta] ... eccentricity 1 ... joint fittings 2 ... truss to point bending from the center point d ... joint hardware center point of the joint fittings of the truss member Member 2f Upper and lower flanges 2w Web 3 Upper top plate 4 Lower bottom plate 5 Rib plate 6 Upper splice plate 7 Lower splice plate 8 Middle splice plate 9 Joining line 10 Bending point

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tomofumi Imagawa 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation

Claims (1)

[Claims] A plurality of truss members are arranged at a joint angle in a thickness direction of a joint metal part with respect to a joint plate arranged at a node of the truss frame, and each truss member is provided at an end of the joint metal part. In the joint structure in which the ends of the members are respectively bolted via splice plates, the joint ends of the truss members are fed toward the center of the joint hardware to the limit that the splice plate can attach, and the joints are joined. Each truss member abuts on the rib plate of the joint hardware while being inclined at the setting angle so that the joint line between the hardware and each truss member is inclined when viewed from the side, and the joint end of the joint hardware and the truss member In the flange part of,
A joint structure for a truss structure, characterized in that a bent splice plate is attached and bolted together.