JPH1150531A - Joint system of truss member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint system of truss members which can greatly reduce the weight of a truss structure while keeping the strength of the truss structure sufficiently high. SOLUTION: A plurality of truss members 11 are connected to one joint member 10, and a plurality of such junctions 12 are arranged to assemble a three-dimensional truss structure as a whole. Each truss member 11 is formed as an FRP pipe formed in a hollow shape from an FRP material, and the truss members 11 are opposed to the joint member 10 in a straight line and joined thereto, with an FRP rod 13 provided to pass through the hollow parts 11a of the opposite truss members 11 and the joint member 10, and with a tensile force applied to the FRP rod 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truss member joining system in which a truss structure is assembled by sequentially joining truss members using joining members.

[0002]

2. Description of the Related Art In recent years, there has been a system truss which has been assembled using industrially-used joining parts as standard parts when constructing a truss which is a smooth frame.
In this system truss, a rod-shaped truss member is sequentially joined to the spherical joint, so that the truss structure can be easily assembled.

[0003]

However, in such a conventional system truss, since a metal material such as iron or aluminum, which is frequently used as a general structural material, is used, the weight of the entire truss structure is significantly increased, and various types of truss structures are used. Failure occurs. In other words, when mounting the truss structure, the truss is assembled on the ground and lifted to a predetermined mounting position. At this time, it is necessary to use a large heavy machine. It is necessary to divide the structure into a plurality and lift it. In addition, when a truss structure is attached, there are various problems such as a need to increase the strength of a structure supporting the truss structure.

In view of the above-mentioned problems, the present invention provides a truss member joining system capable of sufficiently reducing the weight of a truss structure while sufficiently securing the strength of the truss structure. The purpose is to:

[0005]

In order to achieve the above object, in a truss member joining system according to the first aspect of the present invention, while joining a plurality of truss members to one joining member, By arranging a plurality of the joining portions, in a truss member joining system designed to be assembled as a truss structure, the truss member is formed in a hollow shape by using an FRP material, while the truss member is linearly joined to the joining member. The truss members are opposed to each other, and an FRP rod is provided in the hollow portion of the truss member and through the joint member, and a tensile force is applied to the FRP rod.

In a truss member joining system according to a second aspect of the present invention, a reinforcing member formed of a lightweight member is closely fitted inside the hollow truss member. .

The operation of the present invention will be described below with reference to the above structure. In the first aspect, a hollow truss member made of FRP material is joined to a joining member, and an FRP rod penetrating the truss member and the joining member. By applying a tensile force to the truss member, a compressive force is applied to the truss member to maintain the connection of the entire truss structure. At this time, the truss member, which is a main component of the truss structure, is formed in a hollow shape by the FRP material, so that the weight of the truss structure is significantly reduced by the characteristics of the FRP material. By the way, hollow FRP
The truss member made of the above-mentioned truss member has a remarkably large compressive stress with respect to a tensile stress. However, a compressive force acting as a reaction force of the tensile force of the FRP rod acts in a compression direction in which the stress is increased. It is possible to reduce the diameter, and this also contributes to weight reduction.

According to the second aspect of the present invention, a reinforcing member formed of a lightweight member is closely fitted to the inside of the hollow truss member, and the buckling resistance of the truss member is reduced by the reinforcing member. Can increase.

[0009]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of a truss member joining system according to the present invention. FIG. 1 is a perspective view showing an essential part of a truss member joined state, and FIG. It is sectional drawing.

That is, in the truss member joining system of the present embodiment, a plurality of truss members 11 are connected to one joining member 10 as shown in FIG.
By arranging a plurality of the joining portions 12, a three-dimensional truss structure can be assembled as a whole. Here, in the present invention, basically, the truss member 11 is used.
Is formed as an FRP pipe formed in a hollow shape by an FRP material, the truss member 11 is joined to the joining member 10 in a straight line, and the inside of the hollow portion 11a of the opposed truss member 11 and the above A rod 13 made of FRP is provided through the joining member 10,
The pulling force is applied to the rod 13.

The truss member 11 is formed to be long, and both ends of the truss member 11 are sequentially joined to the joining member 10, and a plurality of truss members 11 are radially joined to one truss member 11. Thus, a space truss structure is formed. FRP forming the truss member 11
The material is a fiber reinforced plastic, which is formed by solidifying reinforced fibers such as glass fiber and carbon fiber with a synthetic resin.

The joining member 10 has a spherical main body 10a.
And a joining cylinder 10b is radially protruded from a portion where the truss member 11 is joined to the main body portion 10a. The joining tube 10b is formed to have a larger diameter than the truss member 11, and the outer end of the truss member 11 is closely fitted inside the joining tube 10b as shown in FIG. Also, as shown in the figure, a stopper 10 is provided at an appropriate position inside the joining cylinder 10b.
c is fixedly mounted, and the tip of the fitted truss member 11 abuts on the stopper 10c.

The FRP rod 13 is made of fiber-reinforced plastic similarly to the truss member 11, but in particular, the FRP rod 13 is arranged in such a manner that the fiber direction is arranged along the axial direction, so that the FRP rod 13 is not easily pulled. It is formed to have great strength. The FRP rod 13 is
Truss member 11 sequentially and linearly joined to joining member 10
Is continuously inserted through the hollow portion 11a, and nuts (not shown) are screwed into both ends of the rod 13 made of FRP and tightened to apply a tensile force to the rod 13 made of FRP. . The means for applying the pulling force is not limited to the fastening by screwing, and other pulling means may be used.

A reinforcing member 14 made of a lightweight member is closely fitted to the tip of the truss member 11 inside the hollow portion 11a. The reinforcing member 14 is made of a light and strong material such as a foam material (for example, styrene foam), an ultra-light material (inorganic or organic material), a lightweight metal material, or the like. .

In the truss member joining system of the present embodiment having the above-described configuration, a plurality of truss members 11 are sequentially joined via the joining member 10 and the truss members 11 are joined.
Each truss member 1 is tightened by tightening both ends of the FRP rod 13 inserted through the
1 is assembled three-dimensionally to form a three-dimensional truss structure as a whole. At this time, a compressive force acts on the truss member 11 by the tensile force of the FRP rod 13, and the end of each truss member 11 is strongly pressed against the joining member 10, so that the entire three-dimensional truss structure is connected. Is maintained.

Since the truss member 11, which is the main component of the three-dimensional truss structure, is formed in a hollow shape by using an FRP material, the truss member 11 can be significantly reduced in weight by the characteristics of the FRP material. The hollow truss member 11 also contributes to weight reduction.
Further, the rod 13 penetrating the truss member 11 is also made of FR.
Since it is made of P, the weight of the truss structure can be prevented from increasing due to the rod 13 made of FRP.
Therefore, in the present embodiment, it is possible to reduce the weight by utilizing the strength of the material called FRP, and it is possible to improve the workability when lifting or attaching the truss structure when installing the truss structure. Incidentally, the truss member 11 made of hollow FRP has a remarkably large compressive stress with respect to a tensile stress, and a compressive force acting as a reaction force of the tensile force of the FRP rod 13 acts in a compression direction in which the stress increases. Therefore, the diameter of the truss member 11 can be reduced, which can contribute to weight reduction.

The truss member 11 is connected to the joining cylinder 10b.
The reinforcing member 14 formed of a lightweight member is closely fitted to the inside of the hollow portion 11a at the distal end of the truss member 11, and the buckling resistance of the end portion of the truss member 11 is increased by the reinforcing member 14. be able to. For this reason, buckling when compressive force acts on the truss member 11 can be prevented, and
Higher strength of the truss member 11 made of FRP can be expected. The reinforcing member 14 is a truss member 11
It is not limited to the end, and may be provided at the central portion or the whole.

Here, in the above embodiment, a stopper 10c is provided inside the joining cylinder 10b, and the stopper 10c is provided.
Although the case where the tip of the truss member 11 is brought into contact with c to receive the compressive force has been disclosed, the present invention is not limited to this, and the tapered stopper 15 is provided as shown in FIG.
The truss member 11 is formed by the tapered stopper 15.
May be received. That is, the tapered stopper portion 15 is
The tapered taper 15a formed on the outer periphery of the distal end of the joint tube 10 and the reverse taper 15 formed on the inner periphery of the distal end of the joining cylinder 10b
b.

Therefore, even in the embodiment shown in FIG. 3, the compressive force of the truss member 11 can be received by the tapered stopper portion 15, and the truss member 11 is tapered. , And the joining cylinder 10
Since the diameter of the opening b is increased, the truss member 11 can be easily assembled by inserting the truss member 11 therebetween.
The tapered stopper 15 may be constituted by only one of the taper 15a of the truss member 11 and the reverse taper 15b of the joining cylinder 10b.

FIGS. 4 to 6 show a second embodiment of the present invention. FIG. 4 is a perspective view of a joint part in the course of assembly, FIG. 5 is a perspective view of a joint part in an assembled state, and FIG. In this cross-sectional perspective view, this embodiment will be described with the same reference numerals given to the same components as those in the first embodiment, and redundant description will be omitted.

That is, in this embodiment, the main body portion 10a of the joining member 10 is formed into a hollow regular hexahedron, and joining columns 10e are projected from two opposing side surfaces 10d, and a hollow is provided outside the joining columns 10e. The inside of the truss member 11 is fitted closely. In this case, the tip of the truss member 11 is in contact with the side surface 10d to receive a compressive force acting on the truss member 11. Of course, even in this embodiment, the truss member 11
The FRP rod 13 is inserted through the hollow portion 11a, the connecting column 10d, and the main body portion 10a, and the truss member 11 is formed in a hollow shape by an FRP material.

Therefore, even in this embodiment, the truss member 11 is fitted to the joining column 10d of the joining member 10, and a tensile force is applied to the FRP rod 13 to easily assemble the truss structure. In addition, the overall weight can be reduced by the FRP.

In the present invention, the truss member 11 is
Rod 1 made of P material and made of hollow and made of FRP
3 by applying a tensile force to the truss member 11.
The shape of the main body portion 10a of the joining member 10 can be variously selected, and the structure of a portion where the truss member 11 such as the joining cylinder 10b or the joining column 10d is fitted is arbitrarily selected. be able to.

[0024]

As described above, in the truss member joining system according to the first aspect of the present invention, a hollow truss member formed of an FRP material is joined to a joining member, and the truss member and the joining member are joined together. Since a tensile force is applied to the penetrating FRP rod, a compressive force is applied to the truss member as a reaction force of the tensile force of the FRP rod, and the entire truss structure can be maintained connected.
The truss member, which is a main component of the truss structure, is formed in a hollow shape by an FRP material.
Significant weight reduction can be achieved by the features of the RP material. Further, the truss member made of hollow FRP has a remarkably large compressive stress with respect to a tensile stress, and can exert a compressive force acting as a reaction force of the tensile force of the FRP rod in a compression direction in which the stress increases. Therefore, it is possible to reduce the diameter of the truss member, which can contribute to weight reduction. Further, since the weight of the truss structure can be reduced in this way, the workability for lifting and attaching the truss structure is greatly improved.

In the truss member joining system according to the second aspect of the present invention, a reinforcing member formed of a lightweight member is closely fitted inside the hollow truss member. The buckling strength of the truss member can be increased by the reinforcing material, and various excellent effects such as increasing the strength of the truss structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part in a state where truss members according to a first embodiment of the present invention are joined.

FIG. 2 is a sectional view of a main part of a joint portion of the truss member, showing the first embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a joint portion of a truss member showing another embodiment of the first embodiment of the present invention.

FIG. 4 is a perspective view of a joint part of a truss member according to a second embodiment of the present invention in the process of being assembled.

FIG. 5 is a perspective view of a joint portion of a truss member according to a second embodiment of the present invention in an assembled state.

FIG. 6 is a cross-sectional perspective view of a truss member according to a second embodiment of the present invention, which is taken across a joint portion.

[Explanation of symbols]

 Reference Signs List 10 joining member 11 truss member 12 joining portion 13 rod made of FRP 14 reinforcing material

Claims (2)

[Claims] In a truss member joining system, a plurality of truss members are joined to one joining member and a plurality of joining portions are arranged to assemble a truss structure. While being formed in a hollow shape by the FRP material, the truss member is joined to the joining member so as to linearly oppose each other, and an FRP rod is provided in the hollow portion of the opposing truss member and through the joining member. A truss member joining system, wherein a tensile force is applied to an FRP rod. 2. The truss member joining system according to claim 1, wherein a reinforcing member formed of a lightweight member is closely fitted to the inside of the hollow truss member.