JPH10280530A - Hub for truss and truss structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase strength by forming a truss structure of a hub, in which a plurality of connecting grooves are formed to an outer circumferential surface, and a frame member, in which end sections are fitted into the connecting grooves, and screwing rod-shaped hub connectors to the upper-lower surface sections of the hub. SOLUTION: The cylindrical hub 7 having a tapped hole 26 at a center is molded of aluminum, stainless steel, etc., and connecting grooves 28 with irregularities are formed to the outer circumferential surface of the hub 7 at regular intervals in the circumferential direction. The hub 7 in a top face section and the hub in an underside section are formed integrally at both end sections of one hub connector 8 consisting of a round bar, the connecting end section 18 of the connecting member 12 of a frame member 6 is pressed into the connecting groove 28 of each hub 7 installed at both end sections of the hub connector 8, and the hubs 7 and a holding plate 31 are clamped by a bolt 30. A bracket 36 formed of U-shaped two metal fittings is fitted and held into a fitting groove 40 formed to the hub 7 or the hub connector 8, and both end sections are coupled by a bolt. Accordingly, the strength of the truss structure is increased, and the truss structure can resist to load in the vertical direction sufficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a truss hub used as a structural member of a truss structure of a frame portion of a double-layer truss structure, and a truss structure using the same.

[0002]

2. Description of the Related Art A truss structure of this kind is constructed by connecting frame members with a joint called a columnar hub, and does not require joining by bolts or welding in assembling. It has excellent features such as high joint efficiency, smart and high lighting, and wide column-free space.
It is widely used for rooftops such as outdoor concert halls, gas stations, pools and exhibition halls, side walls of buildings, dome for botanical gardens, temple domes and other structures.

As such a double-layer truss structure, there are truss structures having various shapes such as a dome type, a mosque type, a pyramid type, a flat structure type, and a barrel vault type. And a case where it is used as a structure provided as a part of a structural part of a building.

[0004] Among these truss structures, the present invention particularly targets a frame portion of a double-layer truss structure of a flat structure type and a barrel vault type (hereinafter, referred to as a truss structure). The double-layer type is a static vertical direction in which the upper and lower parts are provided at predetermined intervals and are connected in a truss-like manner by a diagonal material or diagonal material and lattice material connecting them. Because it has greater strength against loads than the single layer type, it is widely used for flat structure type and barrel vault type.

[0005] Since a truss structure of such a truss structure has recently been required to have sufficient strength to withstand snowfall, strong earthquakes, etc., a large structure is constructed. In such cases, take various measures such as using a frame member made of thick pipe, shortening the length of the frame member, or increasing the number and diameter of lattice materials to increase the rigidity of the truss. I have.

[0006]

However, if a thick pipe is used or the diameter of the pipe is increased, the weight of the truss structure itself increases, so that the truss structure itself cannot be enlarged, and a short frame member is required. However, if the number of lattice materials is increased or the number of lattice materials is increased, the number of cylindrical hubs that serve as truss points also increases, so that there is a problem that time is required for assembly work.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. It is an object of the present invention to increase the strength with a relatively simple structure and to reduce the load in the vertical direction. It is an object of the present invention to provide a truss structure that is sufficiently durable.

[0008]

In order to achieve the above object, a hub for a truss according to the present invention comprises a hub having a plurality of connecting grooves formed on an outer peripheral surface thereof, and an end fitted into these connecting grooves. In a double-layer type three-dimensional truss structure having an upper surface portion and a lower surface portion formed by a frame member, respectively, a hub forming the upper surface portion and a hub forming the lower surface portion are formed in a rod-like shape connecting the upper surface portion and the lower surface portion. It is characterized by being provided integrally or integrally at both ends of the hub connector. Further, the truss hub according to the present invention is characterized in that the hub connected body is formed integrally with an extruded member. Further, the truss hub according to the present invention is characterized in that a threaded portion is provided on the hub, and an end of the hub connector is screwed to the threaded portion. Further, the truss structure according to the present invention has an upper surface and a lower surface formed by a plurality of hubs having a plurality of connection grooves formed on an outer peripheral surface thereof and a plurality of frame members having ends fitted into the connection grooves. In the double-layer type three-dimensional truss structure, which is formed and fastened between the hubs of the upper surface and the lower surface with a diagonal material as appropriate, a hub forming the upper surface and a hub forming the lower surface are connected to the upper surface. The truss hub is formed integrally or integrally at both ends of a rod-shaped hub connecting body connecting the part and the lower surface. Further, the truss structure according to the present invention is characterized in that the hub and the hub connector are integrally formed by extruded members. Further, the truss structure according to the present invention is characterized in that a thread portion is provided on the hub, and a hub connector is screwed to the thread portion.

In the present invention, since the rod-shaped hub connecting body provided with the hubs of the upper surface and the lower surface functions as a lattice material receiving a compressive force between the upper surface and the lower surface, the diagonal member receives a resistance against tension. The strength of the truss structure is increased only by disposing the material having the truss structure. Since the hub is formed integrally or integrally with the hub connector, the number of parts and the number of assembly steps are reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a front view showing an embodiment in which the present invention is applied to a double-layer flat structure type truss structure, FIG. 2 is a front view of main parts, FIG. 3 is a plan view of main parts, and FIG. , FIG. 5 is a plan view showing a part of the joint structure part cut away, and FIG. 6 is an exploded perspective view of a hub and a frame member. In these figures, a double-layer flat structure type truss structure 1 is constructed in a truss shape by an upper surface portion 2, a lower surface portion 3, a diagonal member 4, and a hub connector 8 and is installed on a pedestal structure 5; The entire structure is covered with a roof member (not shown) to complete a flat structure type truss structure. The pedestal structure 5 includes a concrete wall, a panel body, a window body, a support, and the like, and has sufficient strength to support the truss structure.

The upper surface portion 2 and the lower surface portion 3 have exactly the same structure, a large number of frame members 6 arranged in the same phase, and a plurality of cylindrical hubs (hereinafter simply referred to as hubs) connecting these frame members 6. 7). The hub 7 on the upper surface 2 and the hub 7 on the lower surface 3 are integrally formed at both ends of a single hub connector 8 made of a round bar as shown in FIG. Alternatively, as shown in FIG. 7, a male screw part 7A provided on the hub 7 may be separately screwed into a screw hole 8A provided on an end face of the hub connector 8. .

The frame member 6 is attached to a frame body 11 made of a straight pipe such as JIS A6061-T6 or A6063-T6 made of aluminum alloy or SUS304 or SUS316 made of stainless steel, and attached to each end of the frame body 11. And two connecting members 12.

The frame body 11 has an outer diameter of 25-3.
00mmφ, length 0.5-4m, wall thickness 1-10mm
As shown in FIG. 6, female screws 13 to which the connecting members 12 are screwed are formed at both ends of the inner peripheral surface.

The connecting member 12 is manufactured by cutting and cutting or casting or forging an extruded aluminum alloy material, and has a cylindrical base 12A.
And a connecting portion 12B integrally provided on the distal end surface of the base portion 12A. On the outer periphery of the base 12A, a male screw 14 that is screwed to the female screw 13 of the frame body 11 is formed. The connecting portion 12B has a trapezoidal shape in height as substantially equal to the height of the hub 7 and a width larger than the outer diameter of the base portion 12A, and a concave surface in which a part of the outer peripheral surface of the hub 7 contacts the distal end surface. A contact surface 16 is formed over the entire length in the height direction.
The connection end portion 18 that fits into the connection groove 28 is integrally protruded. Further, on both side surfaces of the connection end portion 18, irregularities 19 called dimples are provided in order to secure the connection with the hub 7. The both side surfaces 20 of the connecting portion 12B are formed on inclined surfaces orthogonal to each other by being inclined at 45 degrees with respect to the axis of the frame member 6, and closely contact the side surfaces 20 of the adjacent connecting member 12 as shown in FIG.

When such a connecting member 12 is manufactured by using an extruded profile, as shown in FIG.
6 and a connection end portion 18, an extruded section 21 having a trapezoidal shape in a plan view that is long in the axial direction of the hub 7 is manufactured, and the extruded section 21 is cut into a length substantially equal to the length of the hub 7, and then connected. End 18
The opposite side may be machined into a cylindrical shape using a lathe or the like to form a male screw 14 on the peripheral surface, and this portion may be used as the base 12A.

Here, in the present embodiment, the side surfaces 20 of the connecting members 12 are simply brought into close contact with each other.
May be fastened by bolts 42 and nuts 43 as shown in FIG. Further, in order to reduce the weight of the connecting member 12, an opening 48 that opens to the upper and lower surfaces may be formed in the connecting portion 12B as shown in FIG.
In addition, such an opening 48 is provided with a projection on the holding plate 31 shown in FIG. 6 in advance, and when this projection is inserted into the opening 48, the coupling strength between each frame member 6 and the hub 7 is increased. be able to.

The hub 7 is usually made of aluminum alloy JI
SA6082-T6, stainless steel SCS11 or S
It is formed into a cylindrical shape by an extruded shape member or a casting of CS13, and has a screw hole 26 at the center. On the outer peripheral surface of the hub 7, four connection grooves 28 having irregularities 27 on the groove wall surface are formed at equal intervals in the circumferential direction, and these connection grooves 28 are connected to the connection end portions 18 of the connection member 12. Are press-fitted from the axial direction to connect the frame members 6 to each other,
Forming a truss case. Bolt 30 in screw hole 26
Is screwed via a holding plate 31, and the holding plate 31 is pressed against the upper surface of the hub 7 in the upper surface portion 2 and pressed against the lower surface in the lower surface portion 3, so that the connection end 18 is connected to the connection groove 28.
Has been prevented from exiting. The bolt 30 and the holding plate 31 are also used for attaching a roof panel member (not shown) to the upper surface of the upper surface portion 2. The outer diameter of the hub 7 is about 50 to 200 mmφ, and the length is about 40 to 300 mm. The hub 7 constituting the upper surface portion 2 and the lower surface portion 3 is extruded integrally with the hub connector 8 continuously. The screw hole 26 may be formed by forming a pilot hole that penetrates when the hub 7 is extruded, and using this pilot hole to thread it with a tap or the like, or by forming a pilot hole in the hub 7. It is also possible to use a drill, tap, or the like to cut a thread only on a necessary surface without side dishes.

When the hub 7 and the hub connector 8 are integrally manufactured or integrally mounted as described above, there is an advantage that the number of parts of the truss structural member can be reduced. Further, the hub connector 8 connects the truss points of the upper surface portion 2 and the lower surface portion 3 to each other to form a lattice material which receives a compressive force between the upper surface portion and the lower surface portion. Increase the mechanical strength of The connection groove 28
Is formed over the entire length of the hub 7 and the hub connected body 8 when the hub 7 and the hub connected body 8 are integrally manufactured by extrusion. When the hub connector 8 is manufactured separately from the hub 7, it is needless to say that the connection groove 28 does not need to be formed in the hub connector 8 as shown in FIG.

The diagonal member 4 includes eight tie rods 38 each having one end connected to a spherical joint 35.
The spherical joint 35 connects a total of eight frame members 6, four each for upper and lower portions, and ends of the upper and lower frame members 6.
It is located at the center of the cube formed by the two hub links 8. The tie rods 38 are provided in a diagonal direction of the cube, and the other ends thereof are respectively connected to connection fittings 37 mounted via brackets 36 near the respective ends of the hub connection body 8. Both ends of the tie rod 38 are screwed into screw holes provided in the spherical joint 35 and the connection fitting 37, respectively. In this case, for example, a right-hand threaded screw hole is formed in the spherical joint 35, and a left-handed thread is formed in the connection fitting 37, thereby applying tension to a key portion of the truss structure 1. That is, at the time of assembling the diagonal member 4, first, each end of the tie rod 38 is screwed into the spherical joint 35 and the screw hole of the connection fitting 37, then the connection fitting 37 is attached to the bracket 36, and then the tie rod 37 is rotated. The spherical joint 35 and the connection fitting 37 are moved in a direction to draw each other. As a result, tension is applied to the truss structure 1.

The bracket 36 is composed of two metal fittings formed in an Ω shape. These metal fittings are located inside the hub 7 and are provided in the fitting grooves 40 (provided in the hub 7 or the hub connecting body 8). (See FIG. 6), and is attached to the hub connector 8 by connecting both ends with bolts. The fitting groove 40 is provided to prevent the bracket 36 from moving in the axial direction of the hub connector 8, and is formed by cutting after forming the hub 7 or the hub connector 8. Also, this bracket 36
The connecting end 18 of the connecting member 12 is connected to the connecting groove 28 of the hub 7.
It is held together with the holding plate 31 so as not to move further. However, when directly fixing to the hub connector 8 with bolts, it is not necessary to form the fitting groove 40. In addition to the above, the arrangement of the diagonal member 4 is the same as that of the pair of frame members 6 opposed to each other on the upper surface portion 2 and the lower surface portion 3, and the quadrangular planes disposed on both ends thereof and each frame member May be arranged so as to connect diagonal lines in a rectangular plane formed by

In order to assemble the truss structure 1 having such a structure, each of the hubs 7 provided at both ends of the hub connector 8 is required.
The connection end 18 of the connection member 12 constituting the end of the frame member 6 is sequentially pressed into the connection groove 28 from the axial direction of the hub 7, and the hub 7 and the holding plate 31 are fastened by the bolt 30. When the connection end portion 18 is fitted into the connection groove 28 by press fitting, the outer peripheral surface of the hub 7 and the contact surface 16 of the connection member 12 come into contact with each other. In addition, since the side surface 20 of each connecting member 12 is formed as an inclined surface which is inclined at 45 degrees with respect to the axis of the frame member 6 and is orthogonal to each other, as shown in FIG. It is in close contact with the side surface 20 of another connecting member 12 which is provided at 90 degrees apart in the circumferential direction. Thus, the upper surface 2 and the lower surface 3 are assembled.

Next, the oblique member 4 is assembled. In this assembly, first, the bracket 36 is attached to the fitting groove 40 of the hub connector 8. Next, as described above, each end of the tie rod 38 is screwed into the spherical joint 35 and the screw hole of the connection fitting 37, and then the connection fitting 37 is attached to the bracket 36. Thereafter, the tie rod 37 is rotated in the pulling direction. A predetermined tension is applied to the truss structure 1 by moving the spherical joint 35 and the connection fitting 37 in a direction approaching each other. Thus, the truss structure 1 can be constructed.

In the flat structure type truss structure 1 having such a structure, since the upper surface portion 2 and the lower surface portion 3 are connected by the hub connection member 8, the hub connection member 8 and the diagonal member 4 are combined with the truss structure. The strength and rigidity of the body 1 in the vertical direction can be increased. Therefore, there is no need to form the frame main body 11 with a thick pipe or shorten the frame main body 11, and it is possible to construct a large truss structure. In addition, since the hub 7 of the upper surface 2 and the lower surface 3 is manufactured integrally or integrally with the hub connector 8, the number of parts can be reduced, and assembling workability can be improved.

Further, the side surface 20 of the adjacent connecting member 12
Are made close to each other, no gap is formed between the ends of the frame member 6, and the split angle θ (9
0 °, see FIG. 5) can be kept constant. Therefore, when the frame member 6 receives a compressive or tensile load in the axial direction, no rotational moment is generated in the hub 7 in the circumferential direction, and the hub 7 does not rotate in the in-plane direction (the directions of arrows A and B in FIG. 5). The resistance can be increased, the connection end 18 of the frame member 6 does not bend in the in-plane direction, and the strength of the truss structure 1 can be further increased.

FIG. 11 is a partially cutaway plan view showing a joint structure according to another embodiment of the present invention. In each of the above-described embodiments, the truss structure using a cube as a unit has been described, but the present embodiment shows an example in which the invention is applied to a truss structure using a triangle as a unit. Therefore, six connecting grooves 28 are formed on the outer periphery of the hub 7 at intervals of 60 degrees in the circumferential direction, and the connecting end portions 18 of the respective frame members 6 are press-fitted into these connecting grooves 28 to thereby form one hub 7. And the six frame members 6 form a truss mark. The left and right side surfaces 20 of the connecting portion 12A of the connecting member 12 cross each other at an angle of 60 degrees by being formed on a slope inclined at 30 degrees with respect to the axis, and come into close contact with the side surface 20 of the adjacent connecting member 12. I have. In addition, adjacent connecting members 12 are bolts 4 similarly to the connecting members shown in FIG.
2 and a nut 43 are connected to each other. In addition,
The hubs 7 on the upper surface and the lower surface are provided integrally or integrally at both ends of the hub connector as in the above-described embodiment. In such a structure, the same effect as in the above-described embodiment can be obtained.

In each of the above-described embodiments, an example is shown in which the present invention is applied to a truss structure having a double-layer flat structure type structure. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention is also applicable to the barrel vault type truss structure 50.

[0027]

As described above, according to the truss hub and the truss structure using the same according to the present invention, since the hubs are provided at both ends of the hub connected body, the hub connected body is provided with the upper surface portion. The lower surface is connected via a hub to function as a lattice material. Therefore, the strength and rigidity of the truss structure against the load in the vertical direction are increased, and a large truss structure can be constructed. In addition, when the hub and the hub connector are integrally manufactured, the number of parts can be reduced, the manufacture is easy, and the assembling workability can be improved. Also, the diagonal members need only have a simple structure that receives tension. Furthermore, there is no need to shift the positions of the frame members on the upper and lower parts as in the conventional double-layer truss structure, making it easier to design the end of the structure and differing from the conventional structure. A novel design is obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment in which the present invention is applied to a double-layer flat structure type truss structure.

FIG. 2 is a front view of a main part.

FIG. 3 is a plan view of a main part.

FIG. 4 is a side view of a main part.

FIG. 5 is a plan view showing a part of the joining structure part in a cutaway manner.

FIG. 6 is an exploded perspective view of a hub and a frame member.

FIG. 7 is a perspective view of a hub and a hub connector showing another embodiment of the present invention.

FIG. 8 is a perspective view showing an extruded member before manufacturing a connecting member.

FIG. 9 is a partially cutaway plan view of a joint structure according to another embodiment of the present invention.

FIG. 10 is a partially cutaway plan view showing a joint structure according to still another embodiment of the present invention.

FIG. 11 is a partially cutaway plan view of a joint structure according to still another embodiment of the present invention.

FIG. 12 is a front view of a barrel vault type truss structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Truss structure, 2 ... Upper surface part, 3 ... Lower surface part, 4 ... Diagonal material, 6 ... Frame member, 7 ... Hub, 8 ... Hub connection body, 1
DESCRIPTION OF SYMBOLS 1 ... Frame main body, 12 ... Connecting member, 16 ... Contact surface, 1
8: connection end, 20: side surface, 28: connection groove.

Claims (6)

[Claims] 1. A double-layer type three-dimensional truss having an upper surface and a lower surface formed by a hub having a plurality of connecting grooves formed on an outer peripheral surface thereof and a frame member having ends fitted into the connecting grooves. In the structure, the hub forming the upper surface portion and the hub forming the lower surface portion are provided integrally or integrally at both ends of a rod-shaped hub connecting body that connects the upper surface portion and the lower surface portion. Truss hub. 2. The truss hub according to claim 1, wherein the hub connecting body is formed integrally from an extruded member. 3. The truss hub according to claim 1, wherein a threaded portion is provided on the hub, and an end of the hub connector is screwed into the threaded portion. 4. An upper surface and a lower surface are respectively formed by a plurality of hubs having a plurality of connection grooves formed on an outer peripheral surface thereof and a plurality of frame members having ends fitted into the connection grooves. In a double-layer type three-dimensional truss structure in which a hub between an upper surface portion and a lower surface portion is appropriately fastened with a diagonal member, a hub forming the upper surface portion and a hub forming the lower surface portion opposed thereto are referred to as an upper surface portion. A truss structure characterized by being formed with truss hubs integrally or integrally provided at both ends of a rod-shaped hub connecting body connecting lower surfaces. 5. The truss structure according to claim 4, wherein the hub and the hub connector are integrally formed by an extruded member. 6. The truss structure according to claim 4, wherein a threaded portion is provided on the hub, and a hub connecting body is screwed to the threaded portion.