JPH0853880A - Joint structure of steel pipe truss - Google Patents

Abstract

PURPOSE:To manufacture a joint member with ease and at a low cost and inhibit the generation of a local buckling on a sphere of the joint member. CONSTITUTION:In a steel pipe truss joint structure where a pair of truss lever members 5, which constitute a main member, are concentrically connected to each other by way of a Joint member 10 and a plurality of truss lever materials 2 are radially connected to the joint member 10, the joint member 10 is formed with a hollow sphere 1. An outer surface equally spaced from the center O of the sphere 1 is designed as a joint sphere surface la which joints a plurality of truss lever members 2. Cylindrical parts 4, which are opposed to each other, are projectingly installed to an outer surface of a diameter line L of the sphere 1 where grooves 6, which are required to connect a pair of truss lever material 5, are formed on an outer peripheral part at the tip of the cylindrical part 4 respectively while a plurality of ribs 7 are radially formed on the whole inner surface of the sphere 1.

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 this joint structure of steel pipe trusses, there is provided a nodal member 43 through which a truss rod member 41 forming a main member is joined, and the nodal member 43 is constituted by a hollow sphere 40, and the center of the sphere 40 is formed. 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 a steel pipe truss in which a plurality of truss rods are radially joined to the node member, the node member is formed of a hollow sphere, and the outer surface equidistant from the center of the sphere is A pair of truss rods are welded to each other on the outer circumference of the tip of each of the tubular parts, which are joined spherical surfaces for joining the truss rods, and project from the outer surface of the sphere on the diameter line. And a plurality of ribs are radially formed on the entire inner surface of the sphere, and the ribs are continuously formed along the diameter line as described in claim 2. And extend it through the tubular connecting part The tubular portions are connected to each other through the connecting portion, and the rib portions are continuously extended along the diameter line as described in claim 3. While connecting with each other via a tubular connecting part,
A through hole that opens into the cylindrical portion is formed in the spherical body, and the connecting portion extends in the through hole.

[0008]

According to the structure described in claim 1, a plurality of ribs are formed on the entire inner surface of the sphere, and the outer surface (joint spherical surface) of the sphere is formed.
It is possible to integrally manufacture a nodal member having a pair of tubular portions projecting from each other and a groove formed on the outer periphery of the distal ends of these tubular portions.

After the production of the node member, the truss rods are butt-welded to the groove portions respectively formed at the tips of the pair of tubular portions, and the pair of truss rods are opposed to each other on the diameter line,
Then, a plurality of truss rods are radially welded to the joint spherical surface.

Further, a plurality of ribs are radially formed on the entire inner surface of the sphere to reinforce the sphere in all directions, and any one of a pair of truss rods and radial truss rods is provided. When an axial force acts on the joint spherical surface of the sphere, the axial force is transmitted to another truss rod without causing local buckling of the sphere.

According to the second aspect of the invention, the radial rib portions are continuously extended along the diameter line of the spherical body and are connected to each other through the tubular connecting portion to form the spherical body. Reinforce the sphere in a direction other than the diameter line of. Moreover, the sphere is reinforced in the direction of the diameter line of the sphere by the rib portion continuously extending along the diameter line of the sphere and the connecting portion formed by connecting a pair of cylindrical portions.

Further, according to the structure described in claim 3, the radial rib portions are continuously extended along the diameter line of the spherical body and are connected to each other through the tubular connecting portion to form the spherical body. Reinforce the sphere in a direction other than the diameter line of. Further, the rib portion continuously extending along the diameter line of the sphere reinforces the sphere in the direction of the diameter line 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 with the upper half being a cross section, FIG. 2 is a side view showing the joint structure having the upper half as a cross section taken along line AA, and FIG. 3 is the same. It is sectional drawing corresponding to the upper half of FIG. 2 which shows the joining part structure by changing the joining direction of a truss rod material.

In these figures, 1 is a hollow sphere, and the outer surface equidistant from the center O of this sphere 1 is a joining spherical surface 1a for joining a plurality of truss rods 2 radially.

Through holes 3 are formed in the sphere 1 so as to face each other on the diameter line L, and cylindrical portions 4 are provided on the outer surface on the diameter line L of the sphere 1 along the peripheral edge of the through hole 3. A groove 6 for welding a pair of truss rods 5 forming a main member is formed on the outer circumference of the tip of each of the tubular portions 4.

Further, a plurality of rib portions 7 extending continuously along the diameter line L are radially formed on the entire inner surface of the spherical body 1, and these rib portions 7 have a tubular connecting portion 8 therebetween. Are connected to each other.

Further, the pair of tubular portions 4 are connected to each other via a tubular connecting portion 8.

A discharge hole 9 for discharging casting sand is formed in at least one of the sphere 1 and the connecting portion 8 (both in the embodiment).

The spherical body 1, the rib portion 7, the tubular portion 4 and the connecting portion 8 are integrally formed of cast steel, and the nodes for joining the pair of truss rods 5 and the plurality of truss rods 2 are joined. The member 10 is formed.

In the above structure, the nodal member 10 is manufactured by integral casting, and after the manufacturing, as will be described later, the truss rod 5 is formed in the groove 6 formed at the tip of each of the pair of cylindrical portions 4.
Butt-welding the pair of truss rods 5 to the sphere 1
Are made to face each other on the diameter line L of the
A plurality of truss rods 2 are radially welded to a.

When the joining ends of the pair of truss rods 5 are formed at right angles to the axial direction and brought into contact with the tip of the tubular portion 4, both truss rods 5 have a diameter line L of the sphere 1. Since they face each other above, the truss rod 5 can be easily centered. For this reason, after that, the joint end of the truss rod member 5 may be joined to the tip of the tubular portion 4 by full circumference welding. In addition, the joint ends of the truss rods 2 are formed at right angles to the axial direction, and the joint spherical surface 1 of the spherical body 1 is formed.
When brought into contact with a, the truss rods 2 are gathered toward the center O of the sphere 1. Therefore, after that, the joining end of the truss rod 2 may be welded. When the truss rod 2 is welded to the joint spherical surface 1a of the sphere 1, the joint end of the truss rod 2 is welded to the joint spherical surface 1a where the rib portion 7 exists on the back side. In this case, it is preferable that the truss rod member 2 be accurately arranged at the position of the rib portion 7 as shown in FIG. 2, but as shown in FIG. May be.

Further, a plurality of ribs 7 are radially formed on the entire inner surface of the spherical body 1 to reinforce the spherical body 1 in all directions.
More specifically, the radial rib portions 7 are continuously extended along the diameter line L of the sphere 1 and are connected to each other via the tubular connecting portion 8, so that the radial rib portions 7 other than the diameter line L of the sphere 1 are connected. Sphere 1 in direction
In the direction of the diameter line L of the spherical body 1 by the rib portion 8 continuously extending along the diameter line L of the spherical body 1 and the connecting portion 8 in which a pair of tubular portions 4 are connected. The sphere 1 is reinforced.

In this way, the sphere 1 is omnidirectionally reinforced,
When an axial force acts on the joint spherical surface 1a of the sphere 1 from any one of the pair of truss rods 5 and the plurality of truss rods 2, this axial force causes local buckling of the sphere 1. It is transmitted to other truss rods without causing it.

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

FIG. 4 is a front view showing the joint structure of the steel pipe truss with the upper half being a cross section, and FIG. 5 is a side view showing the same joint structure with the upper half being a cross section taken along the line BB.

The second embodiment is different from the first embodiment in that the discharge hole 19 of the node member 20 is provided with respect to the discharge hole 9 of the node member 10.

Similar to the nodal point member 10, the nodal point member 20 is composed of a hollow sphere 11, and an outer surface equidistant from the center O of the sphere 11 is a joining spherical surface 11a for joining a plurality of truss rods 2, Moreover, cylindrical portions 14 are provided so as to be opposed to each other on the outer surface on the diameter line L of the sphere 11, and grooves 16 for welding the pair of truss rods 5 are welded to the outer circumferences of the tips of these cylindrical portions 14, respectively.
Is formed. In addition, on the entire inner surface of the sphere 11, the diameter line L
A plurality of rib portions 17 extending continuously along the radial direction are radially formed at equal intervals, and the rib portions 17 are integrally connected to each other via a tubular connecting portion 18. However, the node member 1
Unlike 0, the connecting portion 18 is formed to have a diameter smaller than that of the tubular portion 14 to extend into the tubular portion 14, and the casting sand is discharged between the extending portion 18a and the tubular portion 14. Annular discharge hole 1
9 are formed.

In the above structure, the radial rib portion 17
Are continuously extended along the diameter line L of the sphere 11 and are connected to each other through the tubular connecting portion 18, so that the sphere 11 is reinforced in a direction other than the diameter line L of the sphere 11. Also, sphere 1
The sphere 11 is reinforced in the direction of the diameter line L of the sphere 11 by the rib portion 17 which continuously extends along the diametral line L of 1.
Thus, the sphere 11 is omnidirectionally reinforced, and an axial force acts on the joint spherical surface 11a of the sphere 11 from any one of the pair of truss rods 5 and the plurality of truss rods 2. At this time, this axial force is transmitted to another truss rod without causing local buckling of the spherical body 11.

Further, between the extending portion 18a of the tubular connecting portion 18 and the tubular portion 14, the discharge area 9 having the opening area of the first embodiment is formed.
A larger annular discharge port 19 is formed so that the casting sand can be more easily discharged to the outside than in the first embodiment, and the node member 20 can be manufactured more easily than the node member 10.

Next, a third embodiment of the present invention will be described with reference to FIGS.
Will be described.

FIG. 6 is a front view showing the joint structure of the steel pipe truss with the upper half being a cross section, and FIG. 7 is a C-section showing the upper half of FIG.
FIG. 8 is a sectional view taken along the line C, and FIG. 8 is a sectional view taken along the line D-D showing the upper half of FIG. 6.

The third embodiment differs from the second embodiment in the shape of the connecting portion 28 of the node member 30 with respect to the connecting portion 18 of the node member 20.

Similar to the nodal member 20, the nodal member 30 is composed of a hollow sphere 21, and the outer surface equidistant from the center O of the sphere 21 is a joining spherical surface 21a for joining a plurality of truss rods 2. In addition, a pair of cylindrical portions 24 facing each other are provided on the outer surface on the diameter line L of the sphere 21, and these cylindrical portions 2 are provided.
A groove 26 for welding a pair of truss rods 5 is formed on the outer periphery of the tip of each of the four, and a plurality of rib portions 27 continuously extending along the diameter line L are formed on the inner surface of the spherical body 21 at equal intervals. And the rib portions 27 are integrally connected to each other via a tubular connecting portion 28, and the connecting portion 28 is connected to the tubular portion 2.
The diameter is smaller than that of No. 4 and extends in the tubular portion 24, and an annular discharge hole 29 is formed between the extending portion 28a and the tubular portion 24. However, unlike the node member 20, the connecting portion 2
A spherical body 28b that is concentric with the spherical body 21 is formed in the central portion of 8.

In the above structure, a strong spherical body 28b is formed in the connecting portion 28 to make the ribs 27 uniform in the radial direction of the spherical body 21, and the spherical body 21 is provided through these ribs 27.
And the spherical body 28b are coupled to each other, the node member 30
Is made stronger than in the second embodiment.

In the first to third embodiments described above, the tubular portions 4, 14 and 24 are all two sets, but it goes without saying that the number of sets is not limited at all.

[0037]

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 formed of a hollow sphere, and the outer surface equidistant from the center of the sphere is joined to the plurality of truss rods. Cylindrical parts that are joined spherical surfaces and are opposed to each other on the diametrical outer surface of the spherical body are provided in a projecting manner, and a groove for welding the pair of truss rods is formed on the outer periphery of the tips of these cylindrical parts. At the same time, since a plurality of ribs are radially formed on the entire inner surface of the sphere, a plurality of ribs are formed on the inner surface of the sphere, and a pair of cylindrical parts are provided on the outer surface (joint spherical surface) of the sphere so as to project from these cylinders. A nodal member formed by forming a groove on the outer periphery of the tip of the It can be easily manufactured at low cost compared to conventional by casting. Therefore, the manufacturing efficiency of the node member can be improved and the manufacturing cost can be reduced.

After the node member is manufactured, a pair of truss rods are butt-welded to the groove formed at the tip of the tubular portion, and the pair of truss rods are opposed to each other on the diameter line of the sphere. Further, a plurality of truss rods can be gathered toward the center of the sphere and joined to the joining spherical surface of the sphere to join all the truss rods radially. Therefore, the efficiency of construction work can be improved.

Further, a plurality of ribs are radially formed on the entire inner surface of the sphere to reinforce the sphere in all directions, and when an axial force acts on the joint spherical surface of the sphere from the truss rod, the sphere is locally localized on the sphere. It is possible to prevent buckling. Particularly, as described in claim 2, the rib portions are continuously extended along the diametrical line of the sphere and are connected to each other through a tubular connecting portion, and the tubular portion is connected through the connecting portion. If you connect the parts in series,
The rib portion and the connecting portion reinforce the sphere in the direction of the diameter line of the sphere, and the rib portion reinforces the sphere in a direction other than the direction of the diameter line, or, as described in claim 3,
Each of the rib portions is continuously extended along a diameter line of the sphere and is connected to each other through a tubular connecting portion, and a through hole opening in the tubular portion is formed in the sphere, and the through hole is formed. When the connecting portion is extended in the hole, the sphere is reinforced by the rib portion in the direction of the diameter line of the sphere and in a direction other than this direction, and omnidirectional reinforcement can be reliably performed. Therefore, the axial force acting on one of the truss rods can be smoothly transmitted to the other truss rods, so that the strength of the steel pipe truss can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing a joint portion structure of a steel pipe truss according to a first embodiment of the present invention with its upper half being a cross section.

FIG. 2 is a side view showing an upper half of the joint structure in a cross section taken along line AA.

FIG. 3 is a cross-sectional view corresponding to the upper half of FIG. 2, showing the same joint structure in which the joining direction of truss rods is changed.

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 side view showing the upper half of the joint structure in a cross section taken along line BB.

FIG. 6 is a front view showing a joint structure of a steel pipe truss according to a third embodiment of the present invention with its upper half being a cross section.

7 is a cross-sectional view taken along line C-C showing the upper half of FIG.

8 is a cross-sectional view taken along line D-D showing the upper half of FIG.

FIG. 9 is a front sectional view showing a conventional example.

[Explanation of symbols]

 1,11,21 Sphere O center L Diameter line 1a, 11a, 21a Bonding spherical surface 2,5 Truss rod 3,3,23 Through hole 4,14,24 Cylindrical part 6,16,26 Groove 7,17, 27 rib part 8,18,28 connecting part 10,20,30 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 (3)

[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. A cylinder in which the nodal member is composed of a hollow sphere, and an outer surface equidistant from the center of the sphere is a joint spherical surface for joining the plurality of truss rods, and a cylinder facing the outer surface on the diameter line of the sphere. A plurality of ribs are formed radially on the entire inner surface of the sphere while forming a groove for welding the pair of truss rods on the outer periphery of the distal ends of these cylindrical portions. Steel pipe truss joint structure characterized by 2. The rib portions are continuously extended along the diameter line to be connected to each other via a tubular connecting portion, and the tubular portions are continuously provided via the connecting portion. The joint structure of the steel pipe truss according to claim 1. 3. The rib portions are each continuously extended along the diameter line to be connected to each other through a tubular connecting portion, and the spherical body is formed with a through hole opening into the tubular portion. The joint structure of a steel pipe truss according to claim 1, wherein the connecting portion extends in the through hole.