JPH11336185A - Truss type framed structural body, and adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce a frame at a weak part of a structurally weak strength where a stress load is easy to be concentrated, and improve an ultrimate strength of the whole body of a truss. SOLUTION: In a dome-shaped truss type framed structural body, five frames 20A-20E are connected to a columnar hub 3a to form a truss joint of framework of a trapezoidal mesh in a strength wise weak point. One frame 20A, of the frame 20A-20E, which is directed to a dome top part is connected to the columnar hub 3a through an adapter 31, and the other frames 20B-20E are directly connected to it. The adapter 31 comprises two hub connection parts 34 to be fitted with two mutually adjacent connection grooves 8 of the hub 3a, and one frame connection groove 37 with which a connection end part 5 of the frame 20A is fitted. A bend angle β of the connection end part 5 of the frame 20A can thus be set small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truss-like frame structure constructed of a structural material composed of a joint and a frame, and an adapter used for connecting the joint and the frame. It is intended to improve the ultimate strength of weak points of the body.

[0002]

2. Description of the Related Art A truss-shaped frame structure has excellent features such as being smart, having high lighting and a large column-free space, and is therefore used in outdoor concert halls, gas stations, pools, exhibition halls, and the like. It is widely used for structures such as rooftops, side walls of buildings, domes for botanical gardens, temple domes, and the like. The truss-like frame structure of such a structure is constructed by connecting frames, which are the structural members, by joints.

[0003] There are two types of joint methods of the structural material in the truss-like frame structure, namely, a ball joint method, a columnar joint method such as a columnar shape, a square prism shape, and a triangular prism shape. Among these, the latter columnar joint method has the excellent features that the assembling work is simple because no joining by bolts or welding is required in the assembling, and high joint efficiency is obtained. Specifically, a connection groove is formed in a columnar joint (columnar hub) called a hub, and a connection end formed by crushing and a frame having connection ends at both ends are used to connect the connection end of the frame to the hub. (See, for example, U.S. Pat. No. 2,931,467, Japanese Utility Model Application Laid-Open No. 2-98121, and Japanese Unexamined Patent Application Publication No. 7-102633).

As a form of such a truss-shaped frame structure, there are truss-shaped frame structures having various shapes such as a dome type, a pyramid type, a flat structure type, and a barrel vault type. And a case where the structure is provided as a part of the structure.

Here, the dome-shaped truss-like frame structure refers to a structure having a hemispherical and mosque-like shape constructed by a joint and a frame. Among them, the present invention particularly relates to the latter columnar structure. The present invention is suitably applied to a hemispherical and mosque-shaped (hereinafter, collectively referred to as a dome-shaped) truss-shaped frame structure employing a joint system.

FIGS. 3 (A) and 3 (B) are a plan view and a front view showing an example of a conventional hemispherical dome-shaped truss-shaped frame structure employing a columnar joint system, and FIG. 4 is an assembly type for forming truss nodes. Exploded perspective view of a truss hub assembly, FIG.
(A), (B), (C) are a front view, a plan view and a side view of the frame. In these figures, reference numeral 1 denotes a truss-like frame structure in a dome-shaped truss structure formed in a single layer shape, which is composed of a number of frames 2 and a columnar hub 3 connecting these frames 2. .

The frame 2 is usually made of an aluminum alloy (for example, JIS A6061 and A6063 using T1 to T60).
4) or stainless steel SUS304,
Using a pipe such as SUS316, the both ends are crushed by pressing or the like as shown in FIGS. 4 and 5, thereby forming the connection end 5 and the tapered portion 2A.
A locking portion 4 composed of a plurality of dimples (convex portions and concave portions) is provided on both surfaces of the aluminum alloy. When the connection end 5 is fitted into a slot (connection groove) 8 of the columnar hub 3, which will be described later, the engagement portion 4 engages with the engagement portion 7 formed of a dimple formed on the wall surface of the connection groove 8. Thus, the load applied in the axial direction of the frame 2 is transmitted to the columnar hub 3.

Further, generally, when the dome-shaped truss-like frame structure 1 is constructed on the frame 2, the truss-like frame structure 1 is disposed in addition to the split angle θ between the connecting grooves 8 of the columnar hub 3 (see FIG. 4). Depending on the position, three angles, namely, a coin angle α, a bend angle β, and a twist angle γ (see FIG. 5) are provided, thereby making it possible to construct a dome having an arbitrary spherical degree. The coin angle α is the cutting angle of the connection end portion 5 with respect to the axial direction of the frame 2, the bend angle β is the angle between the axis of the frame 2 and the axis of the connection end portion 5, and the twist angle γ is the height of the frame 2 adjacent to the frame 2. And the angle between the connection ends 5 of the frame 2 that connects the connection grooves 8 between the hubs 3 having different center positions of curvature in the hub axial direction. In the dome shape, the coin angle α is set at 80 ° to 90 °, the bend angle β is set at 0 ° to 35 °, and the twist angle γ is set at 0 ° to 5 °. The outer diameter of the frame 2 is 25 to 30.
0 mmφ, length is 0.5 to 4 m, and thickness is about 1 to 10 mm.

The columnar hub (hereinafter, simply referred to as a hub)
Reference numeral 3 denotes a column made of an aluminum alloy A6082-T6, an extruded member of SCS11 or SCS13 of stainless steel, or a forged product, and has a bolt insertion hole 6 at the center. On the outer peripheral surface of the hub 3, six connecting grooves 8 having the engaging portions 7 on the groove wall surface are formed at substantially equal intervals in the circumferential direction. The truss node is formed by fitting the portion 5 from the axial direction. The outer diameter of the hub 3 is 20 to 20.
0 mmφ, and the length is about 40 to 300 mm.

A bolt 9 is inserted into the bolt insertion hole 6, and a washer 10 and a holding plate 1 are provided at upper and lower protruding ends thereof.
1 is attached and the holding plate 11 is pressed against the upper and lower surfaces of the hub 3 by fastening the nut 12, thereby preventing the connection end portion 5 from falling out of the connection groove 8. The bolt 9 and the holding plate 11 are also used for mounting a roof panel member (not shown) on the hub 3.

When a roof member is mounted on the dome-shaped truss-shaped frame structure 1, an assembled dome-shaped truss structure is completed. The size of this kind of truss-like frame structure 1 is appropriately determined depending on design conditions, but is conventionally about 5 m to 100 m in diameter.

Such a dome-shaped truss-like frame structure 1
Since the connection end 5 of the frame 2 is formed in a flat shape that is long in the axial direction (out-of-plane direction) of the hub 3,
There is no particular problem with respect to the strength of the external force in the axial direction of the hub 3, but the tube is crushed and flattened in the in-plane direction of the hub 3 (the circumferential direction of the hub) because the tube is flattened. Weak
Therefore, when an axial compressive or tensile load is applied to the frame 2 in a large truss-like frame structure due to snowfall, earthquake, etc., a rotating force acts on the hub around its axis, and the force acts more than the strength that suppresses rotation. Then, a force that deforms in the circumferential direction of the hub in the truss plane is applied to the connection end of the frame 2 connected to the hub, and the base 5a of the connection end 5 is bent, and the connection 5 is partially broken or the entire structure collapses. It is assumed that Therefore, when constructing a large structure, a frame composed of a thick pipe is used (means 1), the length of the frame is shortened, or disclosed in Japanese Patent Application Laid-Open No. Hei 7-102633. Various measures are taken such as providing a reinforcing plate at the connection end as described above (means 2). Also, in order to prevent the moment for rotating the hub from acting, the axial direction of the frame should be aligned with the center of the hub, that is, the bend angle β should be 0 ° and the moment arm should be 0, or the bend angle β should be attached to the frame. However, the hub is provided with a frame having a bend angle that produces a rotational moment in the opposite direction to the rotational moment with respect to the hub caused by the bend angle β (means 3).

[0013]

As described above, in the conventional dome-shaped truss-shaped frame structure, a frame made of a thick pipe is used to increase the strength, or the length of the frame is reduced. 1) Alternatively, a reinforcing plate is provided at the connection end (means 2).

However, when trying to construct a large dome-shaped structure by these means, the diameter and thickness of the frame are too large, the length is too short, and the number of steps for mounting the reinforcing material is increased. Also, there was a problem in design. In addition, when the above-mentioned means 3 is used, it is necessary to form a trapezoidal mesh portion near the top in the dome-shaped structure, and it is necessary to prepare many types of hubs in which the direction of the connection groove is changed, which is difficult in terms of cost. was there. In other words, the dome-shaped truss-like frame structure is constituted by a triangular mesh as a whole using a 6-slot hub 3 which is a common component at each truss node. For example, frame 2
The mesh is cut at a position where the length becomes approximately half the length L of the frame 2 at the bottom of the dome, and a trapezoidal mesh is inserted to adjust. For example, in the case of the dome type shown in FIG. 3, trapezoidal mesh bands A1 and A2 are formed over the second and fourth stages from the top to form an angle downward from the vertex O according to design conditions, and each has a circumference. It has a plurality of trapezoidal meshes T (T1, T2) in the direction. If all of the hubs 3 of the trapezoidal mesh bands A1 and A2 are to be formed by 6-slot hubs, a large bend angle is required at the connection end of the frame in a specific hub 3 and a large rotational force is applied to the hubs. This torque is not offset by the other frames, but is generated at this particular hub 3, and the strength of the frame joined to this particular hub 3 forms a normal triangle. It was found from the results of the experiment and the elasto-plastic analysis that the mesh portion to be formed was weaker than the strength of the frame 2 and became a weak portion in the truss-like frame structure 1.

That is, the trapezoidal mesh bands A1, A2
Has a trapezoidal mesh T1 in which the frame 2 is filled with only five slots in all four hubs 3 constituting the hub, and two hubs each of which has only five slots filled and all six slots filled. Two types of trapezoidal mesh T2 appear, especially in the case of the former trapezoidal mesh T1 type.
Since all the hubs 3 are filled with only 5 slots,
It was found that the load stress balance was poor, and it became easier to become a weak point portion in terms of strength. The reason for this is that the bend angle β increases and there is no frame to be paired with. That is, as shown in FIG. 6, when a 6-slot hub 3 which is a common component is used, of the four hubs 3 forming the truss nodes of the trapezoidal mesh T1 filled with only 5 slots, the hub on the dome vertex O side is used. 3a, the bend angles β of the five frames 20A to 20E connected to the hub 3a cannot be made substantially equal, and the bend angles β
0 = 0 frames 20C and 20E, and bend angle = β1
Frames 20B and 20D, and a bend angle = β2 (β2>
β1) requires the frame 20A. However, the larger the bend angle β is, the more unfavorably, the larger the moment the axial or compressive load is applied to the frame 2, the larger the moment acting on the hub 3.

Also, in the mosque-shaped dome-shaped truss-shaped frame structure 21 having the size as shown in FIGS. 7A and 7B, for example, the second, fourth, and eighth steps from the top. Trapezoidal mesh bands T1, T2, T3 appear and form weak portions. The positions where such trapezoidal mesh bands A1, A2, A3 can be formed depend on the design conditions, dome style, dome size, length of the frame 2 to be used, or rise ratio (in the case of a dome type, the ratio between height and diameter). ).

Therefore, as one measure to solve the above-mentioned problem, if a 5-slot hub is separately manufactured and used for a weak point portion in terms of strength, the bend angle β of the frame at the weak point portion can be reduced. And then hub 3
Are two or more types of 6 slots and 5 slots, and the truss-like frame structure is expensive and not economical.

The present invention has been made on the basis of the results of the above-mentioned trial production test and elasto-plastic analysis. The object of the present invention is to prevent the hub from generating a rotational force by using an adapter to reduce the structure. It is an object of the present invention to provide a truss-like frame structure and an adapter that have a weak upper portion and that reinforce a frame at a weak point where a stress load tends to concentrate, thereby improving the ultimate strength of the entire truss.

[0019]

According to a first aspect of the present invention, a plurality of frames having connection ends at both ends and a plurality of connecting grooves into which the connection ends of the frames are fitted are provided. In a truss-shaped frame structure constituted by a number of columnar hubs having an outer periphery, the frame is formed by connecting, with an adapter, a columnar hub that forms a mesh node serving as a weak point portion of the truss-shaped frame structure and a frame. Is characterized in that the bend angle at the connection end is reduced.

According to a second aspect of the present invention, there is provided a truss comprising a plurality of frames having connection ends at both ends and a plurality of columnar hubs having a plurality of connection grooves on the outer periphery into which the connection ends of the frame are fitted. In the frame-shaped structure, one of a plurality of frames connected to the pillar-shaped hub is connected to two hub connecting portions fitted to two adjacent connection grooves of the pillar-shaped hub; Are connected to the columnar hub by an adapter having one frame connecting groove to which the connection end of the columnar hub is connected.

According to a third aspect, in the first aspect,
The truss-shaped frame structure is a dome-shaped truss-shaped frame structure including a triangular mesh and a trapezoidal mesh.

According to a fourth aspect, in the second aspect,
The columnar hubs are all formed at substantially equal intervals in the circumferential direction.
Of the four columnar hubs each forming a node of the trapezoidal mesh to which five frames are connected and having at least one connecting groove, at least one of the five frames being connected to the columnar hub on the top side of the dome. Are connected via an adapter.

According to a fifth aspect of the present invention, there is provided an adapter used for a truss-like frame structure, which is fitted into two adjacent connecting grooves among a plurality of connecting grooves formed on the outer periphery of a columnar hub. It is characterized in that two hub connecting portions that can be combined and a frame connecting portion to which the frame is connected are provided.

[0024] In a sixth aspect based on the fifth aspect,
The frame connecting portion is a frame connecting groove into which a connection end of the frame can be fitted.

According to a seventh aspect, in the fifth or sixth aspect, a rotation preventing portion for preventing the frame from rotating in the in-plane direction is integrally provided.

An eighth invention is characterized in that, in the fifth, sixth or seventh invention, the adapter is formed of an extruded aluminum alloy.

In the first to eighth inventions, the adapter comprises:
By connecting the hub and the frame to each other, the bend angle at the connection end of the frame is reduced. In a dome-shaped truss-shaped frame structure, when a triangular mesh and a trapezoidal mesh are formed using a common 6-slot hub at each truss node, the trapezoidal mesh portion becomes a weak portion in terms of strength. Of the four hubs at the truss node of the trapezoidal mesh, five frames are connected to the hub on the dome apex side, so that one slot is empty. Therefore, when one of the five frames is connected to the adapter and the two connecting portions for the hub provided on the adapter are connected to two connecting grooves adjacent to the hub, the frame connected to the adapter is formed. Bend angle β at the connection end can be reduced.
Therefore, the deformation of the frame in the in-plane direction and the rotation of the hub are suppressed, and the strength of the weak point increases. In addition, since the adapter is provided with the rotation preventing portion, the deformation of the frame in the in-plane direction and the rotation of the hub are further suppressed, and the strength of the weak point portion is increased. Furthermore, when the adapter is formed of an extruded aluminum alloy material, it is easy to form a connecting portion for a hub and a connecting groove for a frame in the adapter.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. 1 (A) and 1 (B) are a plan view and a side view of an assembled truss hub assembly forming a truss node, showing one embodiment of a truss-like frame structure and an adapter according to the present invention. The same components as those shown in the section of the prior art are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

Referring to FIG. 3, a single-layer dome-shaped truss-like frame structure 1 is composed of a large number of frames 2 and a 6-slot hub 3 which is a common part at each truss node, and is entirely formed of a triangular mesh. However, since the mesh of the truss becomes too fine as it goes to the upper part in the construction, for example, by performing mesh cutting at a position where the length of the frame 2 is about half the length L of the frame 2 at the bottom of the dome, It is adjusted by inserting a trapezoidal mesh. Here, a trapezoidal mesh band A 1, A 2,
A2 are formed, each having a plurality of trapezoidal meshes T (T1, T2) in the circumferential direction.

Of the frame strength at the hub 3a at these trapezoidal mesh bands A1 and A2, the strength in the circumferential direction of the hub 3a is weaker than the strength at the frame 2 of the mesh part forming a triangle as described above. It is a weak point in the frame-shaped structure 1.

In addition, these trapezoidal mesh bands A1, A2
A trapezoidal mesh T1 in which the frame 2 is filled with only 5 slots in all four hubs 3a constituting the hub 3 and a hub 3 filled with 5 slots and 6 slots
a, 3b, two trapezoidal meshes T2
In particular, in the case of the former trapezoidal mesh T1 type, since all the hubs 3a are filled with 5 slots, the load stress balance is poor, and the strength becomes a weak point portion. The reason is that the use of the 6-slot hub 3a which is a common component as described in FIG.
Side, the bend angles β of the five frames 20A to 20E connected to the hub 3a are different.
2 is not preferable because a large rotational moment is generated by the connection end portion 5 of the frame 20A having a large 2.

Therefore, in the present invention, the bend angle β2
1 is connected to the hub 3a using an adapter 31 as shown in FIG.
The bend angle β of the frame 20A is reduced. on the other hand,
Frame 20 in which bend angle β1 is small and rotational force is offset
B and 20D and frames 20C and 20E are directly connected to the hub 3a as in the conventional case.

The adapter 31 is made of an aluminum alloy (for example, JIS A6061 and A606) similarly to the frame 2.
3 tempered to T6) or stainless steel SUS3
The main body 33 is formed of a molded product such as 04, SUS316 or the like, and is formed of a hexagonal block in plan view having substantially the same length as the hub 3a, and is integrally protruded from a surface of the main body 33 facing the hub 3a. The two hub connecting portions 34
It has. The two hub connecting portions 34 are connected to the main body 3.
3 is formed so as to extend over the entire length, and locking portions 36 made of dimples are formed on both side surfaces. Such a connecting portion 34 for a hub is connected to the frames 2, 20A to 20A.
E is formed identically to the connection end 5. The hub connecting portions 34 are formed so as to intersect with each other at an angle of 60 °, so that two adjacent hubs 3 a of the hub 3 a are connected to each other.
The two connection grooves 8 are fitted into the hub 3a from the axial direction.

The body 33 has a frame connecting portion 37 and two screw holes 38 formed therein. The frame connecting portion 37 is formed of a groove having the same shape as the connecting groove 8 of the hub 3a, is formed at the center in the width direction of the surface of the main body 33 opposite to the hub 3a side, and is provided at one end of the frame 20A. On the groove wall surface of the frame connection groove 37 into which the connection end 5 is fitted in the axial direction, an engagement portion formed of a dimple with which the locking portion 4 of the connection end 5 can be engaged is formed. Also,
The connection groove 37 for the frame is substantially three times as large as the connection part 34 for the hub.
The frame of the main body 33 is formed substantially perpendicular to the face so as to intersect at an angle of 0 °. A bolt 39 for fixing the holding plate 11 is screwed into the screw hole 38. The holding plate 11 is formed to have substantially the same contours as those of the hub 3a and the adapter 31 in a connected state in plan view. The frame 20A is oriented toward the top O of the dome and the other end is connected to the hub 3 at the top O of the dome (FIG. 6A).

In the dome-shaped truss-shaped frame structure having such a structure, the trapezoidal mesh T1 forming the weak point portion is connected to the hub 3a on the dome top O side among the four hubs forming each truss node. 5 frames 2
0A to 20E, that is, the connection end 5 of the frame 20A pointing to the dome top O is connected to the hub 3a via the adapter 31, so that the bend of the connection end 5 of the frame 20A is formed. The angle (β) can be made smaller than the bend angle β2 of the conventional frame shown in FIG. 6 by the intersection angle between the hub connecting portion 34 and the frame connecting groove 37. Accordingly, rotation of the hub 3a and deformation of the frame 20A in the in-plane direction when a compressive or tensile load is applied to the frame 20A in the axial direction can be prevented, and the ultimate proof stress of the dome-shaped truss-like frame structure 30 can be reduced. Can be increased.

Further, since the hub 3a itself can be used as it is as a hub composed of common parts of 6 slots,
There is no need to separately manufacture a hub dedicated to the above unique portion.
In addition, since the adapter 31 is connected to the hub 3a by the two hub connecting portions 34, the connection strength between the hub 3a and the adapter 31 is large. Furthermore, since the adapter 31 only needs to cut the extruded shape into a predetermined length and provide a thread or a through hole as necessary, the manufacture thereof is also easy. The holding plate 11 may use a holding plate for holding the hub portion of a normal hub portion, and a dedicated holding plate may be used for the adapter 31 portion.

FIGS. 2A and 2B are a plan view and a side view of an assembled truss hub assembly forming a truss node, showing another embodiment of the present invention. In the present embodiment, the adapter 41 is integrally provided with a rotation preventing portion 42 for preventing the frame 20A from rotating in the in-plane direction. The rotation preventing portion 42 has a V-shaped groove 44 that is integrally formed with the main body 43 of the adapter 41 and protrudes from the surface of the main body 43 on the side opposite to the hub 3a, and into which the tapered portion 2A of the frame 20A fits. A frame connection groove 37 into which the connection end portion 5 of the frame 20A is fitted is formed at the rear end of the frame 44. Other structures are the same as those of the adapter 31 shown in FIG.

In the adapter 41 having such a structure, the end of the frame 20A is reinforced by the rotation preventing portion 42 to prevent the frame 20A from rotating in the in-plane direction. The proof stress can be further increased.

Here, in the above-described embodiment,
Groove 44 of anti-rotation part 42 and tapered part 2 of frame 20A
A, and connection end 5 and frame connection groove 37
Although the example in which the adapter 41 is attached to the frame 20A by fitting with the above is shown, the adapter 41 may be further fixed to the frame 20A with bolts and nuts.

In each of the above-described embodiments, an example is shown in which the present invention is applied to the hemispherical dome-shaped truss-like frame structure 1. However, the present invention is not limited to this, and the present invention is not limited to this. The dome-shaped truss-shaped frame structure can be applied as it is to the weak point portion.

[0041]

As described above, the truss-like frame structure and the adapter according to the present invention are configured so that the hub and the frame are connected via the adapter, so that the bend angle at the connection end of the frame is reduced. be able to. Therefore, especially in the dome-shaped truss-shaped frame structure, it is possible to prevent the rotation of the frame and the in-plane deformation of the frame at the weak point where the structural strength is weak and the stress load is likely to concentrate, and the truss-shaped frame structure Ultimate proof stress can be increased.

Further, in the present invention, since the adapter is provided with the rotation preventing portion, the rotation of the frame in the in-plane direction is further suppressed, and the strength of the weak point portion can be further increased.
Further, the present invention is easy to manufacture because the adapter is formed by an extruded aluminum alloy.

[Brief description of the drawings]

1 (A) and 1 (B) are a plan view and a side view of an assembled truss hub assembly forming a truss node, showing one embodiment of the present invention.

FIGS. 2A and 2B are a plan view and a side view of an assembled truss hub assembly forming a truss node, showing another embodiment of the present invention.

FIGS. 3A and 3B are a plan view and a front view of a dome-shaped truss-like frame structure showing an example of a frame structure in a prefabricated truss structure.

FIG. 4 is an exploded perspective view showing a joint structure forming a truss point.

FIGS. 5A, 5B, and 5C are a front view, a plan view, and a side view of a frame.

FIG. 6 is a diagram showing a bend angle of a frame at a weak point portion.

7A and 7B are a plan view and a front view of a mosque-shaped dome-shaped truss-like frame structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dome-shaped truss-like frame structure 2 ... Frame, 2
A: tapered portion, 3, 3a: pillar-shaped hub, 5: connection end portion, 8
... Connecting grooves, 20A to 20E ... Frame, 31 ... Adapter, 33 ... Main body, 34 ... Hub connecting part, 37 ... Frame connecting part (frame connecting groove), 41 ... Adapter, 42
... Anti-rotation part, 44... Groove, A1, A2, A3... Trapezoidal mesh part which is weak point, T1, T2, T3.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 3, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

The columnar hub (hereinafter, simply referred to as a hub)
3 is formed into a cylindrical shape by extruded, forged or forged products of aluminum alloy A6082-T6, stainless steel SCS11 or SCS13, and has a bolt insertion hole 6 at the center. On the outer peripheral surface of the hub 3, six connecting grooves 8 having the engaging portions 7 on the groove wall surface are formed at substantially equal intervals in the circumferential direction. The truss node is formed by fitting the portion 5 from the axial direction. The outer diameter of the hub 3 is 20
２００200 mmφ and the length is about 40-300 mm.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Such a dome-shaped truss-like frame structure 1
Since the connection end 5 of the frame 2 is formed in a flat shape that is long in the axial direction (out-of-plane direction) of the hub 3,
There is no particular problem with respect to the strength of the external force in the axial direction of the hub 3, but the tube is crushed and flattened in the in-plane direction of the hub 3 (the circumferential direction of the hub) because the tube is flattened. Weak
Therefore, when an axial compressive or tensile load is applied to the frame 2 in a large truss-like frame structure due to snowfall, earthquake, or the like, a rotational force that rotates the hub around its axis acts, and the force suppresses the rotation. When the above action is taken, a force deforming in the circumferential direction of the hub is applied to the connection end of the frame 2 connected to the hub in the truss plane, and the base 5a of the connection end 5 is bent to partially break or break the entire structure. It is assumed that it will collapse. Therefore, when constructing a large structure, a frame composed of a thick pipe is used (means 1), the length of the frame is shortened, or disclosed in Japanese Patent Application Laid-Open No. Hei 7-102633. Various measures are taken such as providing a reinforcing plate at the connection end as described above (means 2). Also, in order to prevent the moment for rotating the hub from acting, the axial direction of the frame is made to coincide with the center of the hub, that is, the bend angle β is set to 0 ° and the moment arm is set to 0, or the bend angle β is attached to the frame. However, the hub is provided with a frame having a bend angle that produces a rotational moment in the opposite direction to the rotational moment with respect to the hub caused by the bend angle β (means 3). ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 25, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

The columnar hub (hereinafter, simply referred to as a hub)
3 is formed into a columnar shape by extruding, casting or forging a product of aluminum alloy A6082-T6, stainless steel SCS11 or SCS13, and has a bolt insertion hole 6 at the center. On the outer peripheral surface of the hub 3, six connecting grooves 8 having the engaging portions 7 on the groove wall surface are formed at substantially equal intervals in the circumferential direction. The truss node is formed by fitting the portion 5 from the axial direction. The outer diameter of the hub 3 is 20
２００200 mmφ and the length is about 40-300 mm.

Claims (8)

[Claims] 1. A truss-like frame structure comprising a number of frames having connection ends at both ends and a number of columnar hubs having a plurality of connection grooves on the outer periphery into which the connection ends of the frames are fitted. A truss-shaped body, wherein a bend angle at a connection end of the frame is reduced by connecting an adapter to a columnar hub that forms a mesh node serving as a weak point portion of the truss-shaped frame structure and an adapter. Frame structure. 2. A truss-like frame structure comprising a number of frames having connection ends at both ends and a number of columnar hubs having a plurality of connection grooves on the outer periphery into which the connection ends of the frames are fitted. In the body, one of a plurality of frames connected to the columnar hub is provided.
The columnar hub is connected to the columnar hub by means of an adapter having two hub connecting portions fitted into two adjacent connecting grooves of the columnar hub and one frame connecting groove to which a connection end of a frame is connected. A truss-like framed structure connected to a truss. 3. The truss-shaped frame structure according to claim 2, wherein the truss-shaped frame structure is a dome-shaped truss-shaped frame structure including a triangular mesh and a trapezoidal mesh. . 4. The truss-like frame structure according to claim 3, wherein the columnar hubs are all formed at substantially equal intervals in the circumferential direction.
Of the four columnar hubs each forming a node of the trapezoidal mesh to which five frames are connected and having at least one connecting groove, at least one of the five frames being connected to the columnar hub on the top side of the dome. Are connected via an adapter. 5. An adapter used for a truss-like frame structure, wherein the adapter can fit into two adjacent connection grooves among a plurality of connection grooves formed on the outer periphery of a columnar hub. An adapter for a truss-like frame structure, comprising: a plurality of hub connecting portions; and a frame connecting portion to which the frame is connected. 6. The truss-like framed structure according to claim 5, wherein the frame connecting portion is a frame connecting groove into which a connection end of the frame can be fitted. Adapter. 7. The adapter for a truss-like framed structure according to claim 5, further comprising an anti-rotation portion for preventing rotation of the frame in the in-plane direction. adapter. 8. The adapter for a truss-like framed structure according to claim 5, 6 or 7, wherein the adapter is formed of an extruded member of an aluminum alloy.