JP2011047136A - Three-dimensional suspended beam structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use an internal space by securing the center space of a structure. <P>SOLUTION: This three-dimensional suspended beam structure includes a plurality of beam members 11, 11... radially extending from the center axis O of the structure, a plurality of first strings 12 which are disposed under the beam members 11 in the same direction as the beam members 11 while directing the longitudinal direction thereof in the radial direction, the outer peripheral ends 12a of which are connected to the first intersections P1 of the beam members 11 and column members, and the inner peripheral ends 12b of which are positioned between the center axis O of the structure and the first intersections P1 when viewed from above, second strings 13 which connect the inner peripheral ends 12b of the first strings 12, and binding members 14 for connecting the any positions (third intersections P3) of the beam members 11 between the center axis O of the structure 1 and the beam ends 11a to the second intersections P2 of the inner peripheral ends 12b of the first strings 12 and the second strings 13. The first strings 12 and the second strings 13 are tensed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a three-dimensional stringed beam structure of a structure having a stringed beam structure.

  Conventionally, as a roof structure for structures such as multi-purpose domes and arenas, it is composed of beams that receive compressive force, bundles, and strings that receive tension, using form resistance such as suspension cables and 2-hinge arches. The string string structure is known. In such a stringed beam structure, it is mechanically advantageous that a string tension member (string) is arranged below the horizontal and arcuate beams.

  By the way, there is a string arch structure that uses the mechanical characteristics of the dome as a dome shape that has a high rise and can effectively use the internal space. In such a dome-shaped stringed arch structure, since the strings are arranged along the dome shape, there is an effect of pulling down the beam material, and the stress control of the beam is not as effective as the above-described stringed beam structure. . Furthermore, when the rise of the dome is low, the stringed beam structure is arranged in multiple stages, and the support points at both ends of the stringed beam structure are raised similarly to the above-described parallel type to ensure the ceiling height of the central part ( For example, see Patent Document 1).

Japanese Unexamined Patent Publication No. 1-137035

  However, in the conventional stringed beam structure, the string is arranged below the horizontal, so it is difficult to secure the ceiling height, the ceiling height is determined near the center, and sufficient ceiling height is secured. However, it was difficult to make effective use of the internal space.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a three-dimensional stringed beam structure that can secure a central space of a structure and can effectively use an internal space.

  In order to achieve the above object, the three-dimensional stringed beam structure according to the present invention is a three-dimensional stringed beam structure in which the roof frame provided on the column of the structure is configured and the beam members are arranged radially in plan view. A plurality of beams extending in the radial direction passing through the center of the beam, arranged in the same direction as the beams with the length direction in the radial direction at positions below the beams, one end of the beam and the column And a second string that connects the other ends of the plurality of first strings to each other, and a second string that is connected to the first intersection of the plurality of first strings. And a bundle that connects the second intersection of the second string and the other end of the first string and an arbitrary position between the center of the beam material structure and the beam end. It is characterized by the tension between the strings.

In the present invention, since the first string and the second string each function as a tensile material, by applying appropriate tension to the first string and the second string, an upward reaction force is applied through the bundle material. Therefore, the structure as a whole is a self-balancing frame, and a horizontal reaction force is not generated in the lower structure that supports the roof frame.
That is, the second string is arranged at an obtuse angle with respect to the extending direction of the first string on both sides of the other end (inner peripheral side end) of the first string. By introducing a tension to each first string to be applied, the tension acting on the first string is distributed to the second string. At this time, an upward bending moment acts on the string structure constituted by the first string and the second string, similarly to the bending moment of the conventional string structure extending in the diameter direction through the center. That is, an upward force can be applied to the beam member via the bundle member by the tension force acting on the entire string structure.

Therefore, the downward bending moment due to the weight of the beam member located above the string structure and the upward bending moment acting on the entire string structure are balanced, and the second string is arranged in the circumferential direction. Even in this case, it is possible to control the stress and displacement of the beam material as in the conventional string structure.
Since the first string is arranged only on the outer peripheral side in a plan view below the roof surface constituted by the beam material and is not arranged in the central portion, compared to the conventional structure in which the string is arranged in the central portion. The height of the central space of the structure can be secured large, and it is especially suitable for buildings such as gymnasiums and stadiums where stands are placed outside the building.

  According to the three-dimensional stringed beam structure of the present invention, the string is arranged only on the outer peripheral side in a plan view below the roof surface constituted by the beam material and is not arranged in the central portion. The height of the central space of the structure can be ensured larger than the structure to be arranged. Effective use of the internal space of the structure can be achieved.

It is a side view which shows the structure provided with the three-dimensional stringed beam structure by the 1st Embodiment of this invention. It is a perspective view of the three-dimensional stringed beam structure shown in FIG. (A), (b) is a figure for demonstrating the effect | action of a three-dimensional stringed beam structure. (A)-(c) is a figure for demonstrating the effect | action of a three-dimensional stringed beam structure. It is a figure for demonstrating the effect | action of a three-dimensional stringed beam structure. It is a perspective view which shows the structure of the solid stringed beam structure by 2nd Embodiment.

Hereinafter, a three-dimensional stringed beam structure according to a first embodiment of the present invention will be described with reference to FIGS.
Reference numeral 1 in FIG. 1 is employed in a multi-purpose dome, arena or the like, and is provided with a roof frame of a three-dimensional stringed beam structure 10 in which stringed beams (beam members 11 to be described later) are arranged radially in a plan view shown in FIG. The structure of the embodiment is shown.

That is, as shown in FIGS. 1 and 2, the three-dimensional stringed string structure 10 is a dome structure having a circular shape in plan view, and is supported from below by the pillar 2 of the structure 1 located in the circular outer shell. At the same time, by tensioning the tension members (first string 12 and second string 13 to be described later), an upward reaction force is applied to the beam member 11, thereby forming the roof frame having a high cross-sectional rigidity. The structure is made.
Here, the direction extending in the radial direction from the central axis O of the structure 1 (corresponding to the center of the structure of the present invention) will be described below as a radial direction.

  The column member 2 is erected on the foundation 3 with a predetermined height, and is disposed on the outer shell of the structure 1 in a plan view. The beam end 11a on the outer peripheral side is fixed by a fixing means such as a bolt.

  The three-dimensional stringed beam structure 10 includes a plurality of beam members 11, 11,... Extending in a radial direction passing through the central axis O of the structure 1, and a beam having a length direction in the radial direction at a position below the beam material 11. Arranged in the same direction as the material 11, one end (outer peripheral end 12 a) is connected to the first intersection P <b> 1 of the beam member 11 and the column member 2, and the other end (inner peripheral end 12 b) is flat. A first string 12 positioned between the central axis O of the structure 1 and the first intersection P1 as viewed, a second string 13 connecting the inner peripheral side ends 12b of the plurality of first strings 12, and a beam member 11 at an arbitrary position (third intersection point P3) between the central axis O of the structure 1 and the beam end 11a and the second intersection point P2 between the inner peripheral end 12b of the first string 12 and the second string 13. The first string 12 and the second string 13 are in tension. And has a configuration was.

  The beam member 11 fixes the beam ends 11 a and 11 a to the upper end 2 a of the column member 2 shown in FIG. 1 with the convex curved portion facing upward, and the center portions of the respective beam members 11 are centered on the structure 1. They are arranged in a state where they intersect at the position of the axis O. The plurality of beam members 11, 11,... Are arranged at a constant interval in the circumferential direction.

  The first string 12 has a length dimension in which the inner peripheral end 12b is disposed at an arbitrary position between the central axis O of the structure 1 and the first intersection P1, and the outer peripheral end 12a is a beam member. 11 is fixed to the beam end 11a on the outer peripheral side, and the inner peripheral end 12b forms a second intersection P2 connected to the second string 13 and the lower end 14a of the bundle 14.

  The second string 13 connects the inner peripheral side ends 12b of the plurality of first strings 12, 12,... In a ring shape, and extends in the circumferential direction around the central axis O of the structure 1. ing.

  The bundle member 14 has an inner peripheral side end 12b of the first string 12 and the third intersection point P3 of the beam member 11 (here, between the center axis O of the structure 1 of the beam member 11 and the beam end 11a). And a compression material acting in the vertical direction.

Next, the operation of the three-dimensional stringed beam structure 1 will be described based on the drawings.
As shown in FIGS. 1 and 2, in the three-dimensional stringed beam structure 10, the first string 12 and the second string 13 function as tension members, respectively, and therefore appropriate tension is applied to the first string 12 and the second string 13. By applying, a reaction force upward can be applied through the bundle member 14, and the structure as a whole becomes a self-balancing frame, and a horizontal reaction force is not generated in the lower structure that supports the roof frame. It has become.

FIG. 3A shows the beam member 11, and FIG. 3B shows a bending moment M <b> 1 due to the weight of the beam member 11.
4 (a) and 4 (b), the second string 13 has the first string 12 on both sides of the inner end 12b (second intersection point P2) of the first string 12. Since they are arranged at an obtuse angle with respect to the extending direction, by introducing tension to each first string 12 arranged in the radial direction, the tension acting on the first string 12 (see FIG. 4B). The indicated arrow E1) is distributed to the second string 13 indicated by arrows E2 and E3, and the resultant force E4 is generated. At this time, the string structure constituted by the first string 12 and the second string 13 has an upward bending moment M2 (FIG. 4) similar to the bending moment of the conventional string structure extending in the diameter direction through the central axis O. (See (c)). That is, an upward force can be applied to the beam member 11 through the bundle member 14 by a tension force acting on the entire string structure.

  Therefore, as shown in FIG. 5, a downward bending moment M1 (FIG. 3 (b)) due to the weight of the beam 11 located on the upper part of the string structure, and an upward bending moment M2 acting on the entire string structure. (FIG. 4C) is balanced, and even when the second string 13 is arranged in the circumferential direction, the stress and displacement of the beam material 11 are controlled in the same manner as the conventional string structure. be able to. A symbol M0 in FIG. 5 indicates a bending moment obtained by combining the bending moments M1 and M2.

Since the first string 12 is arranged only on the outer peripheral side in a plan view below the roof surface made of the beam material and is not arranged in the central part, the conventional string is arranged in the central part. In comparison, the height of the central space S of the structure (the area of the chain double-dashed line shown in FIG. 1) can be secured large, and is particularly suitable for buildings such as gymnasiums and stadiums where stands are arranged outside the building.
Furthermore, since the string is arranged only on the outer periphery of the roof and it is sufficient to introduce tension only to the first string 12, the work process is simplified, and tension introduction management is easy and reliable.

  As described above, in the three-dimensional stringed beam structure according to the first embodiment, the second string 13 is arranged only on the outer peripheral side in a plan view below the roof surface constituted by the beam material 11 and is not arranged in the central portion. Therefore, the height of the central part space S of the structure can be ensured larger than the conventional structure in which the string is arranged in the central part. Effective use of the internal space of the structure 1 can be achieved.

  Next, another embodiment of the present invention will be described with reference to the drawings. However, the same or similar members and parts as those of the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted. The configuration will be described.

As shown in FIG. 6, the three-dimensional stringed beam structure 20 according to the second embodiment has a rectangular shape in plan view. That is, the three-dimensional stringed beam structure 20 extends in a radial direction passing through the central axis O of the structure 1 and is disposed in a diagonal direction of the rectangle, and a pair of beam members 21 and 21 below the beam members 21. It is arranged in the same direction as the beam member 11 with the length direction in the radial direction at the position, and one end (outer end 22a) is at the first intersection P1 between the beam member 11 and the column member 2 (see FIG. 1). The first string 22 is connected between the first string 22 and the other end (inner peripheral end 22b) between the center axis O of the structure 1 and the first intersection P1 in a plan view. An arbitrary position (third intersection point P3) between the second string 23 having a shape similar to the rectangle connecting the circumferential end portions 22b, the central axis O of the structure 1 of the beam member 21 and the beam end 21a, and The second of the inner string side end 22b of the first string 22 and the second string 23 And a Tabazai 24 for connecting the point P2, has a structure in which a first string 22 and a second string 23 is tensioned.
Similarly to the first embodiment described above, the three-dimensional stringed beam structure 20 of the second embodiment has a structure in which the first string 22 is not disposed inside the second string 23 in plan view. There is an advantage that a large central space can be secured.

The embodiment of the three-dimensional stringed beam structure according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
For example, the structures of the beam members 11 and 21, the first strings 12 and 22, the second strings 13 and 23, the bundle members 14 and 24, such as the length dimensions, the number of arrangements, and the fixed positions can be changed or omitted. Is possible.
Further, the beam member 11 can have a chevron shape in addition to the convex portion facing upward.

DESCRIPTION OF SYMBOLS 1 Structure 2 Column material 10, 20 Three-dimensional stringed string structure 11, 21 Beam material 11a 21a Beam end 12, 22 1st string 12a, 22a Outer peripheral side end (one end)
12b, 22b Inner peripheral side end (other end)
13, 23 Second string 14, 24 Bundle material O Center axis of structure 1 (center of structure)
P1 1st intersection P2 2nd intersection P3 3rd intersection S Central part space

Claims (1)

It is a three-dimensional stringed beam structure that constitutes the roof frame provided on the pillar of the structure and arranges the beam material radially in plan view,
A plurality of beam members extending in a radial direction passing through the center of the structure;
These beams are arranged in the same direction as the beam with the length direction in the radial direction at a position below the beam, and one end is connected to the first intersection of the beam and the column. A first string having an end located between the center of the structure and the first intersection in plan view;
A second string connecting the other ends of the plurality of first strings;
A bundling material connecting an arbitrary position between the center of the structure of the beam material and the beam end and a second intersection of the other end of the first string and the second string;
With
A three-dimensional stringed beam structure in which the first string and the second string are tensioned.

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