JPH0853881A - Joint structure of steel pipe truss - Google Patents

Abstract

PURPOSE:To enhance strength and work efficiency by constituting a joint member in a joint structure of a steel pipe truss with a hollow sphere and connecting a plurality of truss lever materials radially to the outer surface equally spaced from the center of the sphere and installing a meshlike projection to the inner surface of the sphere. CONSTITUTION:A hollow sphere 1 having a mesh-like projection 3 which is formed substantially in the shape of a trapezoid on an inner surface as its basis, is integrally cast with cast steel, thereby forming a joint member 14. A pair of truss lever members (steel pipe) 2A, which constitute a main member, are concentrically jointed to the surface 2a of the joint member 4 while a plurality of truss lever members 2B are radially welded with the sphere at its center. The mesh-like sphere 1 is reinforced with the projection 3 in the whole direction. When an axial force acts on the joint surface of the sphere 1 from either truss lever material, this axial force is transmitted to the other truss lever materials without generating a local buckling on the sphere 1. This construction makes it possible to facilitate the centering of the truss lever materials and reinforce the sphere in every direction and transmit the axial force to either truss lever material smoothly.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a steel pipe truss used as a node of a strut structure constituting a space truss.

[0002]

2. Description of the Related Art Conventionally, in the joint structure of a steel pipe truss of this type, a plurality of truss rods are assembled through a node member to a truss rod which constitutes a relatively long main member. One of the joined parts is shown in FIG.

In the joint structure of the steel pipe truss, the truss rod member 41 constituting the main member is penetrated through the center of the nodal point member 43 to be joined, and the nodal point member 43 is constituted by the hollow sphere 40, and the center of the sphere 40 is joined. Bonding spherical surface 40a for radially bonding a plurality of truss rods 44 to the outer surface equidistant from O
I am trying. The inner surface of the sphere 40 and the outer peripheral surface of the truss rod 41 facing each other are connected by an annular rib plate 42.

As a method of manufacturing the node member 43, first,
Two hemispheres 40a, each of which is obtained by dividing the sphere 40 into two, are formed by pressing a circular steel plate, and then through holes 40b are formed in the bulging center of the hemisphere 40a. Next, the truss rods 41 are penetrated through the annular rib plate 42 and welded to each other, and then the truss rods 41 on both sides of the rib plate 42 are separated by 2 pieces.
The hemispheres 40a are penetrated into the through holes 40b and welded to each other, and the opening edges of the hemispheres 40a are welded to each other, and at the same time, the opening edges of the hemispheres 40a are welded to the outer peripheral portion of the rib plate 42.

[0005]

However, in the above-mentioned conventional joint structure of the steel pipe truss, the node member 43 is used.
In the case of manufacturing, the hemisphere 40a, the rib plate 42 and the truss rod 41, the hemisphere 40a and the truss rod 41, and the sphere 40 can be assembled in this order. Will be needed. Therefore, the manufacturing is not easy and the manufacturing cost is high. Further, the sphere 40 is merely reinforced in the diametrical direction by the truss rod member 41 and reinforced in the direction perpendicular to the diametrical direction by the annular rib plate 42, and the other joint spherical surface 40a is wide. There is no reinforcement on the back side. Therefore, when the steel pipe 44, such as a belly member, is welded to the unreinforced joint spherical surface 40a (P in the figure), there is a possibility that the spherical body 40 will locally buckle due to the axial force acting on the steel pipe 44.

The present invention has been made to solve the above problems, and an object thereof is to easily manufacture a node member at low cost and to prevent local buckling of a spherical body of the node member. is there.

[0007]

To achieve the above object, according to the present invention, as described in claim 1, a pair of truss rod members constituting a main member are concentrically joined to each other via a node member. Then, in the joint structure of the steel pipe truss in which a plurality of truss rods are radially joined to the nodal member, the nodal member is composed of a hollow sphere, and the outer surface equidistant from the center of the sphere is formed by the pair of The above-mentioned truss rod and a plurality of truss rods are joined spherical surfaces, and a mesh-shaped projection is formed on the entire inner surface of the sphere.

Further, according to the present invention, as described in claim 2, the truss rod member constituting the main member is penetrated through the center of the node member and joined, and a plurality of truss rod members are radially attached to the node member. In the joint structure of the steel pipe truss joined to, the nodal member is formed of a hollow sphere, the outer surface equidistant from the center of the sphere, and the joint spherical surface for joining the plurality of truss rods, A mesh-shaped projection is formed on the entire inner surface of the sphere.

[0009]

According to the structure described in claim 1, the node member can be manufactured by integral casting. After a pair of truss rods are concentrically opposed to each other in the diametrical direction of the sphere and welded to the joint spherical surface of the sphere, a plurality of truss rods are radially welded to the joint spherical surface.

Further, a mesh-shaped projection is formed on the entire inner surface of the sphere to reinforced the sphere in all directions, and one of a pair of truss rods and radial truss rods When an axial force acts on the joint spherical surface of a sphere, this axial force is
The sphere is transmitted to other truss rods without causing local buckling.

According to the structure described in claim 2, the node member can be manufactured by integral casting. Then, after passing the truss rod through the center of the sphere and joining it,
A plurality of truss rods are radially welded to the joint spherical surface of the spherical body.

Further, a net-shaped projection is formed on the entire inner surface of the sphere to reinforce the sphere in all directions, and any one of a truss rod and a radial truss rod which are penetratingly joined to the sphere. When an axial force acts on the joint spherical surface of the sphere from the rod, this axial force is transmitted to another truss rod without causing local buckling of the sphere.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a front view showing the joint structure of a steel pipe truss partially broken away, FIG. 2 is a sectional view showing a modification of the joint structure, and FIG. 3 is another modification of the joint structure. It is sectional drawing shown.

In these figures, 1 is a hollow sphere, and the outer surface equidistant from the center O of this sphere 1 joins a pair of truss rods 2A and a plurality of truss rods 2B constituting a main member. It is a cemented spherical surface 1a.

The pair of truss rods 2A are welded to the joint spherical surface 1a of the sphere 1 and face each other in the diameter direction of the sphere 1. The plurality of truss rods 2B are welded to the joint spherical surface 1a of the sphere 1 and are gathered toward the center O of the sphere 1.

On the entire inner surface of the spherical body 1, there is formed a mesh-shaped projection 3 which is basically trapezoidal. The protrusion 3 is shown in FIG.
It may be based on a rhombus as shown in FIG.

The sphere 1 and the projection 3 are integrally formed of cast steel to form a node member 4 for joining the pair of truss rods 2A and the plurality of truss rods 2B. still,
Reference numeral 5 denotes a discharge hole for discharging the casting sand, which is formed at an appropriate position on the sphere 1.

In the above structure, the node member 4 can be manufactured by integral casting. Then, as will be described later, after the pair of truss rods 2A are concentrically opposed to each other in the diameter direction of the sphere 1 and welded to the joining spherical surface 1a of the sphere 1, the plurality of truss rods 2B are radially joined. Weld to the spherical surface 1a.

The joint ends of the pair of truss rods 2A are formed at right angles to the axial direction and are welded to the joint spherical surface 1a of the spherical body 1 so as to be concentric with each other. Also, a plurality of truss rods 2
The joint ends of B are formed at right angles to the axial direction, and these truss rod members 2B are welded to the joint spherical surface 1a of the spherical body 1 to which both truss rod members 2A are joined.

Further, a mesh-shaped projection 3 is formed on the entire inner surface of the spherical body 1 to reinforce the spherical body 1 in all directions. Therefore, the pair of truss rods 2A and the radial truss rods 2B
Of one of the truss rods of the
As shown in FIG. 2, when the axial force acts on a, not only when the entire joint end of the truss rod material hits the portion of the joint spherical surface 1a corresponding to the protrusion 3 as shown in FIG. Even when the joint end of the truss rod is only partially hit on the portion of the joint spherical surface 1a corresponding to the portion 3, the sphere 1 does not locally buckle, and the axial force causes the sphere 1 to locally buckle. It is smoothly transmitted to other truss rods without causing

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a front view showing the joint structure of a steel pipe truss with the upper half being a cross section.

The second embodiment differs from the first embodiment in that the truss rod member 6 forming the main member is connected to the nodal member 10.
This is because a plurality of truss rods 2B are radially joined to the node member 10 by penetrating through the center of the joint. The first
The same parts as those in the embodiment are designated by the same reference numerals.

Specifically, through holes 7 are formed on the diameter line L of the sphere 1 so as to face each other, and the truss rod 6 is penetrated and welded to the sphere 1 through the through holes 7. There is.

In the above structure, the truss rod 6 is penetrated through the center of the sphere 1 and joined, and then a plurality of truss rods 2B are radially welded to the joint spherical surface 1a of the sphere 1.

Further, a mesh-shaped projection 3 is formed on the entire inner surface of the sphere 1 to reinforce the sphere 1 in all directions, and the truss rod 6 penetratingly joined to the sphere 1 and the radial truss rod 2B. home,
When an axial force acts on the joint spherical surface 1a of the sphere 1 from any truss rod, this axial force is transmitted to another truss rod without causing local buckling of the sphere 1.

Further, not only the sphere 1 is reinforced by the mesh-shaped projections 3, but also the inner surfaces of the sphere 1 which are opposed to each other on the diameter line L are integrally connected via the truss rod member 6, so that the sphere 1 To further reinforce.

[0029]

As described above, according to the present invention, as described in claim 1, a pair of truss rod members constituting a main member are concentrically joined to each other through a node member, and a plurality of the node members are joined. In the joint structure of the steel pipe truss in which the truss rods are radially joined, the nodal member is composed of a hollow sphere, and the outer surface equidistant from the center of the sphere has the pair of truss rods and a plurality of truss rods. Since the joint surface is formed by joining the truss rods and the net-shaped projections are formed on the entire inner surface of the sphere, the nodal member can be easily produced by integral casting at a lower cost. Therefore, the manufacturing efficiency of the node member can be improved and the manufacturing cost can be reduced.

After a pair of truss rods are concentrically opposed to each other in the diametrical direction of the sphere and welded to the joint spherical surface of the sphere, a plurality of truss rods can be radially welded to the joint spherical surface. The pair of truss rods and the plurality of truss rods can be easily centered. Further, by forming a mesh-shaped projection on the entire inner surface of the sphere to reinforced the sphere in all directions, of the pair of truss rods and radial truss rods,
When an axial force acts on the joint spherical surface of the sphere from any truss rod, this axial force can be smoothly transmitted to another truss rod without causing local buckling of the sphere. Therefore, the efficiency of construction work and the strength of the steel pipe truss can be improved.

Further, according to the present invention, as described in claim 2, the truss rod member forming the main member is penetrated through the center of the node member to be joined, and a plurality of truss rod members are radially attached to the node member. In the joint structure of the steel pipe truss joined to, the nodal member is constituted by a hollow sphere, and the outer surface equidistant from the center of the sphere is a joining spherical surface for joining the plurality of truss rod members, Since the mesh-shaped projections are formed on the entire inner surface of the sphere, the nodal member can be manufactured by integral casting more easily and at lower cost than the conventional one. Therefore,
The manufacturing efficiency of the node member can be improved and the manufacturing cost can be reduced.

Further, after the truss rod is penetrated through the center of the sphere and joined, a plurality of truss rods can be radially welded to the joining spherical surface of the sphere, and the pair of truss rods and the plurality of truss rods can be welded. Each truss rod can be easily centered. In addition, forming a mesh-shaped projection on the entire inner surface of the sphere to reinforced the sphere in all directions, and from one of the truss rods and radial truss rods penetrating and joining the sphere, When an axial force acts on the joint spherical surface of the spherical body, this axial force can be smoothly transmitted to another truss rod member without causing local buckling of the spherical body. Therefore, the efficiency of construction work and the strength of the steel pipe truss can be improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a joint structure of a steel pipe truss according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a modified example of the joint structure.

FIG. 3 is a cross-sectional view showing another modification of the joint structure.

FIG. 4 is a front view showing a joint structure of a steel pipe truss according to a second embodiment of the present invention with its upper half being a cross section.

FIG. 5 is a front sectional view showing a conventional example.

[Explanation of symbols]

 1 Sphere O Center 1a Bonding Spherical Surface 2A, 2B Truss Rod 3 Protrusion 4 Node Member 6 Truss Rod 10 Node Member

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Takeyuki Suzuki 6-2-10 Ginza, Chuo-ku, Tokyo Inside Tomoe Corporation (72) Inventor Takeshi Yamada 6-2-10 Ginza, Chuo-ku, Tokyo Stock Company, Tomoe Corporation

Claims (2)

[Claims] 1. A joint structure of a steel pipe truss in which a pair of truss rod members constituting a main member are concentrically joined to each other via a node member, and a plurality of truss rod members are radially joined to the node member. The nodal member is composed of a hollow sphere, and the outer surface equidistant from the center of the sphere is a joint spherical surface that joins the pair of truss rods and a plurality of truss rods, and the entire inner surface of the sphere. A joint structure of a steel pipe truss characterized in that a mesh-shaped projection is formed on the. 2. A joint portion structure of a steel pipe truss in which a truss rod material forming a main member is penetrated through the center of a node member and joined, and a plurality of truss rod members are radially joined to the node member The member is composed of a hollow sphere, and the outer surface equidistant from the center of the sphere is used as a joining spherical surface for joining the plurality of truss rods, and a net-shaped projection is formed on the entire inner surface of the sphere. The joint structure of the steel pipe truss characterized by the above.