JPH09158316A - Hub with reinforcing member for truss and joint structure for truss base structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain costs and to provide high strength by disposing reinforcing members in circumferentially spaced apart relationship inside a cover covering a hub and ends of frame members from above and below to fill a space between the ends of adjacent frame members. SOLUTION: Covers 21 made of aluminum, fiber reinforced plastics etc., which cover, from above and below, a cylindrical hub for truss, in which a plurality of connection grooves in to which connection ends 5 of frame members 2 for truss structure are forcibly fitted are radially formed, and the ends of the members 2 are provided. And reinforcing members 22 made of extruded material such as aluminum alloy, fiber reinforced plastics are disposed inside the upper and lower coverts 21 in a circumferentially spaced apart relationship to fill the space between adjacent members 2. As a result, even if the members 2 are subjected to compressive and tensile loads in the axial direction and angular moment is generated circumferentially on the hub 3, resistance against rotation of the hub 3 in the direction in the surface thereof is increased so that strength of a truss base structure can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly type space truss structure in which a frame member having an arbitrary cross-sectional shape such as a pipe and an extruded shape member is sequentially connected by a connecting member called a hub. The structure of the hub with the reinforcing member for the truss and the joint structure of the truss base structure using the same, in which the joint between the frame member and the hub is strengthened by restricting the deformation of the frame member in the in-plane direction. is there.

[0002]

2. Description of the Related Art Assembled space truss structures do not require bolts or welding for assembly, so assembly work is easy, high joint efficiency is obtained, and smart, high daylighting and wide pillar-free space are obtained. It is widely used for outdoor concert halls, gas stations, pools, roofs of exhibition halls, side walls of buildings, dome for botanical gardens, temple dome, etc. The joint methods of such truss structures are roughly classified into two types: ball joint method and cylindrical joint method. In the former, a spherical joint (hub) is used for the truss mark, and the frame members are sequentially connected by this (Japanese Patent Laid-Open No. 7-11705).
The latter uses a cylindrical joint (hub) and a frame member having a connecting end formed by crushing (US Pat. No. 2,931,467, Japanese Utility Model Laid-Open No. 2-98121, Japanese Patent No. The present invention relates to a joint structure of an assembling type space truss adopting the latter joint method. Here, the assembly type three-dimensional truss means a truss structure body in which the truss portion has a shape such as a dome shape, a mosque type, a pyramid type, a flat structure type, or a barrel vault type, and these are independent structures. In some cases, it may be considered as a structure attached as a part of the structure. Further, although the dome type is taken as a typical example in the following description, it goes without saying that a truss structure corresponding to each method may be adopted.

FIGS. 10A and 10B are a plan view and a front view of a dome structure showing an example of a truss base in an assembled space truss structure adopting a cylindrical joint method, and FIG. 11 is a truss of a conventional method. 12 (A), 12 (B) and 12 (C) are an exploded perspective view showing a joint structure forming a score, and FIG. 12 (A), FIG. 12 (B), and FIG. 12 (C) are a front view, a plan view, and a side view, respectively. In these drawings, reference numeral 1 denotes a truss base structure in a dome-shaped truss structure, which is composed of a large number of frame members 2 and a cylindrical hub 3 connecting these frame members 2. The frame member 2 is usually made of a straight pipe made of aluminum alloy or the like, and both ends thereof are crushed by press working or the like to form flat connecting end portions 5, and concavities and convexities 4 called dimples are provided on both surfaces thereof. The hub 3 is generally formed of an aluminum alloy (eg, Al—Mg—Si alloy) extruded material, a forged product, or the like into a cylindrical body, and has a bolt insertion hole 6 in the center. In addition, the outer peripheral surface of the hub 3 has 6 to 9 connecting grooves (slots) having irregularities 7 on the groove wall surface.
8 are formed in a radial shape, and the connecting ends 5 of the frame member 2 are press-fitted into the connecting groove 8 from the axial direction to connect the frame members 2 to each other to form a truss mark. A bolt 9 is inserted through the bolt insertion hole 6, a washer 10 and a holding plate 11 are fitted to the upper and lower protruding ends thereof, and the holding plate 11 is fixed to the hub 3 by fastening a nut 12.
The connection end portion 5 is prevented from coming off the connecting groove 8 by being pressed against the upper and lower surfaces. The bolt 9 and the holding plate 11 are also used for mounting the roof panel member on the hub 3. Then, the truss base structure 1 of the assembled truss structure is constructed by connecting the truss points with the frame member 2, and the roof member is placed on the truss base structure 1 to complete the dome type truss structure and the like. It

In such a joint structure of the truss base structure 1, since the connecting end portion 5 which is flatly crushed is provided at the end portion of the frame member 2, the number of parts of the connecting member can be reduced. When constructing a structure having a three-dimensional curved surface structure, three angles (coin angle α, bent angle β, twist angle γ) are to be added to the connecting portion between the connecting grooves 8 of the hub 3 in addition to the split angle θ. Can give an arbitrary sphericity in the frame member itself. In addition, the truss base structure can be simplified since the bearing 3 has a high resistance to the load in the axial direction (out-of-plane direction) of the hub 3 and requires only one truss in design. The coin angle α is the cutting angle of the connecting end 5, the bent angle β is the angle formed by the axis of the frame member 2 and the connecting end 5, and the twist angle γ is the height of the adjacent sides of the frame member and the hub. It is the angle formed between the connection ends of the frame members that connect the connection grooves between the hubs having different axial centers of curvature.

[0005]

In the conventional joint structure of the truss base structure described above, the connecting end portion 5 of the frame member 2 is formed in a flat shape long in the axial direction (out-of-plane direction) of the hub 3. Therefore, there is no particular problem in terms of strength with respect to the external force in the axial direction of the hub 3, but it is relatively weak in the in-plane direction of the hub 3 (the circumferential direction of the hub), and therefore the large truss structure When a compressive or tensile load is applied to the frame member 2 in the axial direction due to snowfall, an earthquake, etc., the frame member 2 is deformed in the circumferential direction in the truss plane and the vicinity 5a of the connection end 5 is bent and partially destroyed. There is a problem that there is a risk that the entire structure will be destroyed. In particular, as shown in FIG. 10, in the case of a dome body, irregular portions other than triangles, in this figure, quadrilateral portions appear in the circumferential direction in order to angle downward from its apex. There is. Since such a portion has a different balance from other portions, it tends to be a weak point portion in the truss base structure, and it is effective to preferentially reinforce this portion.

Therefore, in order to construct a large structure, a frame member made of a thick pipe is used, the length of the frame member is shortened, or disclosed in the above-mentioned Japanese Patent Laid-Open No. 7-102633. As described above, various measures are taken such as providing a reinforcing plate at the connection end. However, when the thick pipe is used, the hub 3 is naturally increased in size and the weight of the truss base structure itself is increased. When the frame member is shortened, the frame member and the truss grade are increased, so that the assembly work takes time. Requires.
Further, when the reinforcing plate is used, the thickness of the connecting end portion 5 is increased, the groove width of the connecting groove 8 is increased, the diameter of the hub 3 is increased in proportion thereto, and the hub mass is increased. was there.

The present invention has been made in order to solve the above-mentioned conventional problems, and its object is to maintain the split angle of the frame member and the like in the circumferential direction of the frame member with a relatively simple structure. It is an object of the present invention to provide a hub body with a reinforcing member for a truss capable of increasing the strength of the truss base structure by restricting the deformation, and a joint structure of the truss base structure using the hub body.

[0008]

In order to achieve the above object, the present invention provides a truss grade cylinder in which a plurality of connecting grooves into which the connecting ends of a truss structure frame member are press-fitted are radially formed. A cover that covers the ends of the hub and the frame member from above and below is provided, and reinforcing members that fill the space between the ends of the adjacent frame members are arranged inside the both covers at intervals in the circumferential direction. Is a hub body with a reinforcing member for a truss. Further, the present invention is characterized in that the reinforcing member has a sectional shape of any one of a fan-shaped member, an H-shaped member, a ladder-shaped member, a king-shaped member and a V-shaped member. It is a hub body with a reinforcing member for a truss. Further, according to the present invention, a frame member having flat connecting ends at both ends thereof, and a cylindrical hub having a plurality of connecting grooves radially formed with a plurality of connecting grooves into which the connecting ends are press-fitted are radially assembled. In the joint structure of the truss base for constructing, a cover for covering the ends of the hub and the frame member from above and below is provided, and a reinforcing member for filling the space between the ends of the adjacent frame members inside the both covers is circumferentially spaced. This is a joint structure of a truss base structure, characterized in that the hub body arranged at a point is used for the weak point portion or the whole portion of the truss grade.

In the present invention, the reinforcing member interposed in the space between the ends of the adjacent frame members holds the split angle θ of the frame members and restricts the circumferential deformation of the frame members. The hub body provided with such a reinforcing member reinforces the weak point portion or the whole portion of the truss grade.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the embodiments shown in the drawings. 1 is a plan view showing an embodiment of a joint structure portion of a truss base structure according to the present invention, FIG. 2 is a front view of the joint structure portion of the truss base structure body, and FIG. 3 is a III-III line of FIG. FIG. In addition, the same components as those described in the section of the prior art are denoted by the same reference numerals, and the description thereof will be omitted. In these figures, in the present embodiment, the ends of the hub 3 and the frame member 2 are covered from above and below by a cover 21 having a cylindrical shape, and a plurality of reinforcing members 22 provided inside the cover 21 are adjacent to each other. The split angle θ of the frame member 2 is maintained by interposing it in the space between the ends of the frame member 2.

The cover 21 can be used also as a pair of upper and lower holding plates 11 shown in FIG. 11, and is fixed to the upper and lower surfaces of the cylindrical hub 3 by bolts 9 and nuts 12 to connect the frame members 2. It also has a function of preventing the end portion 5 from coming off from the connecting groove 8 of the hub 3 in the axial direction of the hub 3. Such a cover 21 is composed of two members 21A and 21B having substantially the same shape by being divided and formed in the vertical direction by aluminum, reinforced plastic, or a combination thereof. The members 21A and 21B are formed in a disk shape having an outer diameter larger than that of the hub 3, and one surface thereof has a concave portion 23 into which the outer peripheral surface of the end portion of the hub 3 fits, as shown in FIGS. 4 and 5. And a bolt insertion hole 24 through which the bolt 9 is inserted. Further, at the center of the bottom surface of the recessed portion 23 of the lower member 21B, a tubular portion 25 surrounding the insertion hole 24 is integrally provided so as to project upward, and the hub 3 is mounted on the tubular portion 25. Placed. The outer diameters of the hub 3 and the tubular portion 25 are substantially equal.

The reinforcing member 22 is formed in a hollow body having a substantially fan-shaped cross section as shown in FIGS. 3 and 6, and is arranged between the adjacent frame members 2 so that the left and right side surfaces 22a are adjacent to each other. The outer circular arc surface 22 is closely contacted with the side surface of the tapered taper portion 26 provided at the end portion of the frame member 2.
The upper and lower ends of b are in close contact with the inner peripheral surface of each member 21A, 21B, that is, the inner surface of the peripheral wall portion 21a surrounding the recess 23. Such a reinforcing member 22 is formed of an aluminum alloy extruded mold material, a reinforced plastic extruded mold material, or the like. The reinforcing member 22 may be a fan-shaped hollow body having the same shape, but if it is made of metal, it is not so preferable because it is heavy, but if it is made of plastic, it can be applied.

The tapered portion 26 of the frame member 2 is formed by being crushed from both sides by press working or the like, and the tip end portion of the tapered portion 26 is press-fitted into the connecting groove 8 of the hub 3. A flat connecting end 5 is integrally provided. Therefore, the space between the end portions of the adjacent frame members 2 forms a fan-shaped space, and the reinforcing member 22 is formed so as to have substantially the same shape as this space.

In order to assemble such a truss-reinforcing-member hub body, the connecting ends 5 of all the frame members 2 are press-fitted into the connecting grooves 8 of the cylindrical hub 3 and then the lower member 21.
B is fitted to the lower end side outer peripheral surface of the hub 3 from below, the reinforcing member 22 is fitted between the adjacent frame members 2, and then the upper member 21A is fitted to the upper end side outer peripheral surface of the hub 3. Then, by inserting the bolt 9 into the cover 21 and the bolt insertion hole of the hub 3 and fastening the nut 12, the cover 21 can be attached to the hub 3.

When assembling the truss base structure, the above-mentioned hub body with reinforcing member for truss is provided at the weak point portion of the truss grade, and at other parts, the conventional hub is used to form the truss base structure body. It can be constructed or constructed by using the above-mentioned hub body for all truss points, and the appearance of the whole structure is similar to that of FIG.

In the joint structure of the truss base structure assembled using the hub body with the reinforcing member for the truss having such a structure, the frame member 2 is formed by the reinforcing member 22.
Since the split angle θ of the hub 3 is kept constant, even if a rotational moment in the circumferential direction is generated in the hub 3 when the frame member 2 receives an axial compression or tensile load, the surface of the hub 3 It is possible to increase the resistance force against the rotation in the inward direction (arrows A and B in FIG. 1).
Therefore, the vicinity 5a of the connection end 5 of the frame member 2 is not bent in the in-plane direction, and the strength of the truss base structure can be increased. Further, since the reinforcing member 22 is used, there is no need to form the frame member 2 with a thick pipe, shorten the frame member 2, or provide a reinforcing plate on the connecting end portion 5. Further, the structure of the cover 21 is simple and can be easily manufactured.

7A to 7D are plan views showing another embodiment of the reinforcing member. The shape of the reinforcing member 22 is not limited to the fan-shaped hollow member shown in the above-described embodiment, but various shapes can be used. For example, a cross-section H-shaped member (A) whose width continuously decreases toward the center of the cylindrical hub, or a cross-section ladder-shaped member (B) whose width also narrows continuously toward the center of the hub. It may be used as a reinforcing member. Also, three contact portions 22c extending in the circumferential direction of the hub and contacting the end surface of the frame member,
22d and 22e have different lengths and are closer to the center of the hub and have shorter sides. The members have a king-shaped section (C), which also extends in the circumferential direction of the hub and abuts on the end side surface of the frame member. The two contact portions 22f and 22g have different lengths, and the contact portion 22g closer to the center of the hub has a shorter side than the outer contact portion 22f. May be

FIG. 8 is a conceptual view of the joint structure portion of the truss base structure showing the mounting state of the reinforcing member of the present invention. In this embodiment, the height of the tubular portion 25 projecting at the center of the bottom surface of the recessed portion of the lower member 21B is made sufficiently high to allow the member 21B to project, and the hub is placed thereon. There is. When the tubular portion 25 is formed high in this way, the height of the frame member 2 becomes high, and the lower surface of the frame member 2 has the member 21.
The upper surface of B can be prevented from touching. In addition,
Other configurations are the same as those of the embodiment shown in FIGS.

FIG. 9 is a partially cutaway front view showing another embodiment of the frame member. In this embodiment, a frame member having a cross-sectional spectacle shape by two straight pipes 30 integrally provided with flat connecting ends 5 at both ends and a connecting plate 31 connecting these straight pipes 30. It constitutes 2A. Such a frame member 2A is
An extruded shape member including two straight pipes 30 and a connecting plate 31 is cut into a predetermined size, both ends of the connecting plate 31 are cut and removed, and then the ends of each straight pipe 30 are flattened. Can be easily manufactured.

An example of this type of frame member is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-180217. In this case, a mounting means similar to the conventional one is used except that a cylindrical hub longer than the conventional one is used. Can be used to form trusses.

A frame member 2 having such a spectacle shape.
When the assembly type truss is constructed by using A, the thin straight tube 30 can be used, and the outer diameter of the tube portion of the frame member and the hub can be reduced with respect to the required dome strength. A structure can be provided.

[0022]

As described above, according to the present invention, in the truss rating cylindrical hub in which a plurality of connecting grooves into which the connecting ends of the truss structure frame member are press-fitted are radially formed, the hub is provided. Since a cover for covering the end portions of the frame member from above and below is provided, and reinforcing members for filling the space between the end portions of the adjacent frame members are arranged inside the both covers at intervals in the circumferential direction. Since it is applicable as it is, and only the cover and the reinforcing member need to be newly manufactured, it is possible to increase the strength of the truss base structure while suppressing an increase in various costs.

The cover also functions as a reinforcing member that reinforces the connecting portion between the cylindrical hub and the frame member. Further, according to the present invention, since the cover is formed by the two members divided in the axial direction of the hub, it is possible to easily attach the frame member from above and below after connecting the frame member to the hub.

Furthermore, according to the present invention, a frame member having flat connecting ends at both ends thereof and a cylindrical hub having a plurality of connecting grooves radially formed therein, into which the connecting ends are press-fitted, are assembled. In a joint structure of a truss base structure for constructing a truss structure, a cover for covering the ends of the hub and the frame member from above and below is provided, and a reinforcing member for filling a space between the ends of adjacent frame members inside both covers. Since the hubs that are arranged at intervals in the circumferential direction are used for the weak points or all parts of the truss grade, the frame members are difficult to bend in the in-plane direction even if they receive axial load, and the assembly type It is possible to increase the strength and rigidity of the truss, and it is possible to construct a large truss such as a dome type or a mosque type, which has been difficult in the past.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a joint structure portion of a truss base structure according to the present invention.

FIG. 2 is a front view of a joint structure portion of the truss base structure.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

4 (A) and 4 (B) are a bottom view of the upper cover and a side view showing a part of the cover.

5 (A) and 5 (B) are a bottom view of a lower cover and a side view in which a part thereof is cut away.

6A and 6B are a front view and a side view of a reinforcing member.

7A to 7D are plan views showing another embodiment of the reinforcing member.

FIG. 8 is a conceptual diagram of a truss base structure showing a mounting state of a reinforcing member of the present invention.

FIG. 9 is a partially cutaway front view showing another embodiment of the frame member.

10A and 10B are a plan view and a front view of a dome-shaped truss base structure showing an example of an assembly-type space truss structure.

FIG. 11 is an exploded perspective view showing a joint structure portion forming a conventional truss mark.

12 (A), (B), and (C) are a front view, a plan view, and a side view of a frame member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dome type truss base structure, 2, 2A ... Frame member, 3 ... Hub, 5 ... Connection end part, 8 ... Connection groove, 9 ... Bolt, 11 ... Holding plate, 21 ... Cover, 21A, 21B ... Member, 22 ... Reinforcing member, 23 ... Recessed portion, 25 ... Cylindrical portion.

Claims (3)

[Claims] 1. A cylindrical hub for truss rating, in which a plurality of connecting grooves into which the connecting ends of a truss structure frame member are press-fitted are formed radially, the ends of the hub and the frame member are arranged from above and below. A hub body with a reinforcing member for a truss, wherein a cover for covering is provided, and reinforcing members for filling a space between end portions of adjacent frame members are arranged inside the both covers at intervals in a circumferential direction. 2. The hub body with a reinforcing member for a truss according to claim 1, wherein the reinforcing member has a sectional shape of a fan-shaped member, an H-shaped member, a ladder-shaped member, a king-shaped member and a V-shaped member. A hub body with a reinforcing member for a truss, characterized in that the hub body has any one of the inner shapes. 3. An assembled space truss structure comprising a frame member having flat connecting ends at both ends thereof and a cylindrical hub having a plurality of connecting grooves radially formed therein, into which the connecting ends are press-fitted. In the truss-based joint structure to be constructed, a cover is provided to cover the ends of the hub and the frame member from above and below, and a reinforcing member that fills the space between the ends of the adjacent frame members inside the both covers is circumferentially spaced. A joint structure for a truss base structure, characterized in that the hub body arranged in advance is used for all or all of the weak points of the truss.