JP2982084B2 - Truss structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truss structure constituted by joining a plurality of bar members with balls.

[0002]

2. Description of the Related Art A truss structure is submerged on the seabed and used as a fish reef or as a buffer for mitigating waves. Such a truss structure includes, for example, a plurality of bar members made of concrete. Constructed by joining with balls. As the bar member, for example, a member in which a tension member such as a metal tension rope is inserted through a cylindrical cylindrical bar made of concrete is used, and the tensile force acting on the bar member is received by the tension member, and the bar member is compressed. The force is received by the cylindrical bar.

[0003]

By the way, in the conventional truss structure, the assembling of the tension member to the ball is performed, for example, by attaching a projection member fixed to an end of the tension member to a hole formed in the ball. It was made by press-fitting (see Japanese Patent Publication No. 52-3487).
There was a problem that assembly was poor.

Further, since the bar member has a double structure composed of a cylindrical bar and a tension member, there is a disadvantage that the structure is complicated and the cost is high.

[0005] The present invention has been made in view of the above problems, and its object is to improve the assemblability, simplify the structure,
An object of the present invention is to provide a truss structure capable of reducing costs and the like.

[0006]

In order to achieve the above object, the present invention provides a truss structure in which a bar member is formed of a steel pipe, and an end of the steel pipe is bolted to a locking member bonded to a ball. The feature is that it constitutes an object.

[0007]

According to the present invention, the truss structure can be easily assembled by directly bolting the end of the steel pipe constituting the bar member to the locking member attached to the ball. Is easy to assemble. The center distance of the ball is adjusted by a shim inserted between the steel pipe and the locking member.

Further, since the bar member is constituted only by the steel pipe, the structure of the truss structure is simplified, and the cost is reduced. Since the steel pipe has high tensile strength and high compressive strength, both the tensile force and the compressive force can be sufficiently received by the steel pipe.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 is a perspective view of a basic truss unit of a truss structure according to the present invention. The basic truss unit is formed by joining six bar members 1... With four balls 2. Is constructed as a three-dimensional truss structure, and a plurality of the basic truss units are combined to construct one truss structure.

Here, the joint structure of the truss structure according to the present invention will be described in detail with reference to FIGS.
FIG. 1 is a partial sectional view showing a joint structure of a truss structure according to the present invention, and FIG. 2 is an exploded sectional view showing how to attach a bar member to a ball.

As shown in FIG. 1, the ball 2 is a hollow sphere made of rubber and has a spherical shell 3 made of metal or reinforced plastic (FRP) embedded therein. A plurality of bolts 4 are radially attached to the spherical shell 3, and the bolts 4 are prevented from coming off by stopper rings 15. The bolts 4 on the outer surface of the ball 2 are Circular dish-shaped grooves 5 are formed at the protruding portions. A locking member 6 is inserted through each bolt 4, and the locking member 6 is connected to the ball 2 by double lock nuts 7 and 7 screwed to the bolt 4. The locking member 6 is configured by sandwiching a metal collar 10 between a metal head cup 8 formed into a dish shape and a bar end socket 9.

On the other hand, the bar member 1 is made of a steel pipe, and a flange 11 is welded to an end of the bar member 1.

Next, the procedure for joining each bar member 1 to the ball 2 will be described with reference to FIG.

As shown in FIG. 2, each locking member 6 is previously bound to the ball 2, and a ring-shaped shim 12 is interposed between the locking members 6 so that the bar member 1 Flange 1
1 are joined, and the bar member 1 includes a flange 11 and a shim 12.
And a plurality of bolts 13 inserted into the locking member 6 and nuts 14 screwed to the bolts 13 are directly connected to the locking member 6.

Thus, one truss structure is constructed by repeating the above-described joint work. The center distance between the balls 2... Is adjusted by changing the thickness of the shim 12. When the truss is assembled to some extent and the positions of the pair of balls 2 at both ends of the bar member 1 are determined, the bar member 1 is assembled as shown by a chain line in FIG. 1 may be inserted between the pair of balls 2 and 2 from the side (in the direction of the arrow in FIG. 2). As a result, the bar member 1 can be easily fitted from the side.

As described above, according to the present embodiment, the truss structure can be easily assembled by directly bolting the end of the steel pipe constituting the bar member 1 to the locking member 6 bonded to the ball 2. Therefore, the assemblability of the truss structure is improved.

Further, since the bar member 1 is constituted only by the steel pipe, the structure of the truss structure is simplified, and the cost is reduced.

In the above embodiment, the ball 2 is made of rubber. However, as shown in FIG. 4, the ball 2 is made of concrete, and the space between the head cup 8 and the bar end socket 9 constituting the locking member 6 is formed. An elastic head 16 made of rubber may be interposed. In this case, the collar 10 (see FIG. 1) used in the above embodiment becomes unnecessary. Alternatively, as shown in FIG. 5, the ball 2 may be made of metal and a rubber elastic head 16 may be directly baked on the ball 2.

[0020]

As is apparent from the above description, according to the present invention, the bar member is formed of a steel pipe, and the end of the steel pipe is bolted to the locking member fixed to the ball, thereby forming a truss structure. Since such a truss structure is constructed, it is possible to improve the assemblability of the truss structure, simplify the structure, and reduce the cost.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a joint structure of a truss structure according to the present invention.

FIG. 2 is an exploded cross-sectional view showing a procedure for assembling the truss structure according to the present invention.

FIG. 3 is a perspective view of a basic truss unit of the truss structure according to the present invention.

FIG. 4 is a partial sectional view showing a modified embodiment of the present invention.

FIG. 5 is a partial sectional view showing a modified embodiment of the present invention.

[Description of Signs] 1 Bar member 2 Ball 6 Locking member 11 Flange 13 Bolt 14 Nut

Continuation of the front page (56) References JP-A-59-210135 (JP, A) JP-A-1-255704 (JP, A) JP-A 52-94011 (JP, U) JP-A 41-3011 (JP) , Y1)

Claims (1)

(57) [Claims] 1. A truss structure constituted by joining a plurality of bar members with a ball, wherein the bar member is formed of a steel pipe, and an end of the steel pipe is bonded to the ball. A truss structure characterized by being bolted to a locking member