JP2017078284A - String beam structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a string beam structure in which the number of structural members of a roof frame is further reduced while employing the string beam structure and the members are slimmed, and thereby design properties can be improved.SOLUTION: A string beam structure 30 includes a roof frame 10 in which multiple first upper chord materials 1 in the gable direction and multiple second upper chord materials 2 in the ridge direction are alternately perpendicular to form multiple panel points 3, a strut material 4A is suspended in the vertical direction from some panel points 3 of all panel points 3, and a tension member 5 extending in a diagonal direction other than the gable direction and the ridge direction in a plan view is bridged between the lower end of the strut material 4A and the panel point 3 without the suspended strut material 4A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stringed string structure characterized by a roof frame.

  A stringed string structure is generally applied to a roof frame of a large space structure such as an arena or a gymnasium. For example, Patent Document 1 discloses an X-type cross stringed beam structure formed by applying a stringed beam structure to a roof frame. Has been.

  The X-type crossed string beam structure disclosed in Patent Document 1 has the following configuration. That is, it is a framework structure of the roof surface of a large building that has a rectangular shape in plan view, and is composed of an upper chord material, a lower chord material, a cane material, and an upper chord stop beam, and the upper chord material has an arch shape, Each end of the upper chord material is constructed over the upper end of the support facing the span direction and each upper chord material is cross-coupled in an X shape at the center, and the end of each adjacent upper chord material is the upper end portion of the support body. Are fixed in the same place. The lower chord material is stretched between the upper chord material fixing portions at the upper ends of the opposing supports, and the cane material is arranged at predetermined intervals along the lower chord material, and is stretched between the adjacent upper chord material and the lower chord material. The upper chord stop beam is stretched between adjacent upper chord members.

  According to the X-type crossed string beam structure, the use of the three-dimensional cross beam and the stringed structure makes it possible to secure the rigidity of the horizontal plane and to perform the assembly work safely and easily.

  The ordinary string beam structure including the string beam structure disclosed in Patent Document 1 is generally composed mainly of an upper chord material, a bundle material, and a tension material (tension material), and bears a vertical force due to a roof load or the like with the tension material. The horizontal force during an earthquake is borne by the brace material on the roof.

JP 2004-263383 A

  In the conventional stringed beam structure described above, a number of members constituting the stringed beam structure are increased because a large number of brace materials that bear the horizontal force during an earthquake are essential, and the design is complicated. I cannot deny it.

  The present invention has been made in view of the above-mentioned problems, and while adopting a stringed beam structure, the number of structural members of the roof frame can be reduced and the design can be improved by slimming the members. The purpose is to provide a body.

  In order to achieve the above-mentioned object, the stringed string structure according to the present invention has a plurality of first upper chord members in the direction of wives and a plurality of second upper chord members in the direction of girder, alternately forming a plurality of grades. However, the bundle member is suspended vertically from some of all the score points, and the tensile member extending in an oblique direction other than the wobbling direction and the girder direction as viewed in plan is the lower end of the bundle material. It is equipped with a roof frame that spans between the grades where the bundle is not suspended.

  In the stringed beam structure according to the present invention, the tensile material (tension material) of the roof frame, which is a constituent element thereof, is disposed in an oblique direction other than the wavy direction and the girder direction when viewed in plan. In addition, it also has one feature in that it is arranged in an oblique direction when viewed from the side.

  The tensile material extending in an oblique direction in the plan view and the side view enables the tensile material to bear both a vertical load and a horizontal load during an earthquake. Here, “viewed in plan” and “plan view” mean the case where the stringed beam structure is viewed from above, and “side view” means the side of the stringed beam structure. It means when viewed from the direction of the wife or the direction of girder.

  By using a tensile material in the diagonal direction, especially in the side view, in the stringed beam structure, because this tensile material is in the diagonal direction, the component that bears the vertical force due to dead load etc. of the roof frame and the component that bears the horizontal force during earthquake Therefore, it is possible to eliminate the need for a horizontal brace material in the roof surface as in the conventional stringed beam structure, and to significantly reduce the number of members.

  And the stringed beam structure can be slimmed by this significant reduction in the number of members, and thereby the design can be improved. The “reducing the number of members” includes literally reducing the number of members as well as reducing the size of the members.

  In addition, regarding the structure in which the tensile material is arranged in an oblique direction other than the wobbling direction and the girder direction when viewed in a plan view, such a structure exists in the arch structure in the past, but the stringed beam structure Conventionally, there is no structure in which an oblique tensile material is applied.

  Thus, the technical idea of applying an oblique tension material to the stringed beam structure can be said to be a technical idea of incorporating an element of a tensegrity structure (tensile composite structure) into the stringed beam structure.

  The tensegrity structure is a structure in which a compression member and a tension member are combined to form a single unit, and when the external force is applied to this unit, the unit structure is retained while the unit is deformed. Generally, it is composed of a rod member, a rope or the like.

  By applying a tensile material in an oblique direction (three-dimensional oblique direction) both in plan view and in side view, a plurality of first upper chord materials in the wives direction and a plurality of second chords in the girder direction It can be said that the tensegrity structure is formed by combining the upper chord material and the bundle material suspended from the rating points of these two kinds of upper chord materials.

  The stringed string structure of the present invention is composed of a vertical frame composed of a roof frame, a column material supporting the roof frame, a vertical brace material disposed between the column material and the column material, and the like.

  In the present specification, the “roof frame” includes, in addition to the literal roof frame, for example, a two-story floor slab in a two-story building.

  The first upper chord material, the second upper chord material and the bundle material can be formed from a steel round pipe or square pipe, and the tensile material can be formed from a structural cable, a PC steel material such as a PC steel wire, or the like.

  A large number of rating points can be formed by the intersection of the plurality of first upper chord materials and the second upper chord material, in which the bundle material is suspended at each rating point separated by a predetermined span. For example, the bundle can be suspended from the score at a pitch (one grid is composed of four rating points) across two grids in plan view.

  In addition, for example, a tension mode in which a tensile material is bridged between a lower end of a bundle member and a grade where the bundle member is not suspended is also, for example, a grade adjacent to the grade where the bundle member is suspended (other bundle members). A form that is bridged to a rating point that is not suspended), a form that is spanned to a score that is two grids away from a score that is suspended from a bundle (a score that is not suspended from another bundle), etc. Can be applied. In addition, when the length of the tension material spanned between the lower end of the bundle material and the grade where the bundle material is not suspended becomes long, the short bundle material is suspended from the middle grade, and the tensile material It is preferable to support the middle position of this with this short bundle.

  When tension acts on the tensile material, the bundle material is pushed upward by the tensile material, and a fulcrum is formed at the grade of the upper chord material by pushing up the bundle material. And, between the fulcrum formed in this way and the rating point (fulcrum) already supported by the pillar material etc., a separate bundle material is pushed upward with a tensile material and the additional fulcrum is formed. Are further formed, and by repeating the formation of such fulcrum, several fulcrum points are formed at a plurality of rating points.

  By forming a plurality of fulcrums in this way, it becomes possible to shorten the span (distance between fulcrums) of the upper chord material. By shortening the distance between the fulcrum of the upper chord material, the bending moment acting on the upper chord material is reduced, so the beam height of the upper chord material can be made as low as possible, and the upper chord material to be used can be made smaller. Can be planned. Such downsizing of the member in use also leads to slimming of the roof frame component.

  As can be understood from the above description, according to the stringed beam structure of the present invention, the roof frame, which is a constituent element, is stretched in an oblique direction (three-dimensionally oblique direction) both in plan view and in side view. By applying the material, this tensile material can bear both vertical load and horizontal load at the time of earthquake, and this eliminates the need for horizontal brace material in the roof surface of the conventional stringed beam structure Can do. By eliminating the need for the horizontal brace material in this way, the number of members can be greatly reduced. This leads to slimming of the stringed beam structure, and the design can be improved by this slimming.

It is the perspective view explaining embodiment of the stringed beam structure of this invention. FIG. 2A is a side view taken along the line aa in FIG. 2C, and is a side axis view seen from the end face of the stringed beam structure, and FIG. 2B is a view taken along the line bb in FIG. It is a figure and is a plane axis set figure which showed the 1st and 2nd upper chord material of a stringed beam structure, (c) is a cc arrow line view of Drawing 2 (a), and is tension of a stringed beam structure It is the plane axis diagram which showed material, (d) is an arrow directional view of the d direction of Drawing 2 (b) and (c), and is a side axis diagram seen from the girder surface of a stringed beam structure . It is a model figure of the stringed beam structure in a computer, Comprising: When the tension | tensile_strength acts on a tension | tensile_strength material, it is a figure explaining that the fulcrum is formed in arbitrary rating points. FIG. 4 is a diagram illustrating that a fulcrum is formed following FIG. 3. It is the figure explaining that the fulcrum was formed following FIG. It is the figure explaining that the fulcrum is formed following FIG. It is the figure explaining that the compressive force holding the tension | tensile_strength which acts on a tension | tensile_strength is acting on the upper chord material.

  Embodiments of a stringed beam structure according to the present invention will be described below with reference to the drawings. The illustrated example is merely an example, and the first and second upper chord materials that are alternately orthogonal, the bundle material that is suspended vertically from the rating point, and extends obliquely both in plan view and in side view Various structural forms can be applied as long as they include a roof frame with a tensile material.

(Embodiment of tension string beam structure)
FIG. 1 is a perspective view illustrating an embodiment of a stringed beam structure according to the present invention. 2 (a) is a view taken along the line aa of FIG. 2 (c), and is a side-axis assembly diagram viewed from the end face of the stringed beam structure. FIG. 2 (b) is a diagram of FIG. FIG. 2B is a plan view showing the first and second upper chord members of the stringed beam structure, and FIG. 2C is a view taken along the line cc in FIG. 2A. FIG. 2 (d) is a plan view of the tension member of the stringed beam structure, and FIG. 2 (d) is a view taken in the direction of d in FIGS. It is the side axis group figure seen from the field.

  As shown in FIG. 1, the illustrated string beam structure 30 is roughly constituted by a roof frame 10 and a vertical frame 20 including a column member 6 and a cane member 7 that support the roof frame 10.

  As shown in FIG. 1 and FIG. 2 (b), the roof frame 10 is mainly composed of a plurality of first upper chord members 1 in the direction of the wives and a plurality of second upper chord members 2 in the direction of the wives. Form a plurality of rating points 3 orthogonal to each other.

  Among the plurality of rating points 3, a long bundle material 4 </ b> A and a short bundle material 4 </ b> B are suspended from some rating points 3 in the vertical direction.

  Here, the first upper chord member 1, the second upper chord member 2, and the bundle members 4A and 4B are formed of a steel round pipe or square pipe.

  Moreover, the tension | tensile_strength material 5 is spanned between the lower end of the elongate bundle material 4A, and the rating point 3 where the bundle materials 4A and 4B are not suspended.

  Specifically, as shown in FIGS. 2A, 2 </ b> C, and 2 </ b> D, when the tensile material 5 is viewed in plan view, the tensile material 5 has two grids (one grid is 4 One square 3 surrounded by first and second upper chords 1 and 2 connecting the three grades 3 and the respective grades 3).

  Further, as shown in FIGS. 2A and 2D, when the tensile material 5 is viewed from the side, the tensile material 5 extends in an oblique direction as in the plan view, and the diagonal lines of the two grids. The tensile material 5 extending in the middle is supported by the short bundle 4B suspended from the rating point 3 existing in the middle of the tensile material 5 in the middle.

  Here, the tensile material 5 is formed of a PC cable such as a structural cable or a PC steel wire.

  The roof frame 10 constituting the stringed beam structure 30 includes the tension member 5 extending in an oblique direction both in plan view and in side view. It has a component in two directions, a component that bears the dead load of the frame) and a component that bears the horizontal force during the earthquake. Therefore, the horizontal brace material in the roof surface as in the conventional stringed beam structure can be eliminated, and the number of members can be greatly reduced.

  And the roof frame 10 and the stringed beam structure 30 can be slimmed down by this significant reduction in the number of members, and thereby the design of the roof frame 10 and the stringed beam structure 30 can be improved.

  Next, with reference to FIGS. 3 to 6, it will be described that fulcrums are sequentially formed at arbitrary grades when a tension acts on an arbitrary tensile material.

  Here, FIG. 3 is a model diagram of a stringed beam structure in a computer, and is a diagram illustrating that a fulcrum is formed at an arbitrary rating point when a tension acts on a tensile material. Moreover, FIGS. 4-6 is the figure explaining the fulcrum being formed sequentially.

  As shown in FIG. 3, in the crossing direction of the stringed beam structure 30, the rating points 3 supported by the ends of the cane members 7 extending from the lower ends of the column members 6 are fulcrums 8A3 to 8A7 and 8A10 to 8A14. 5 end portions are fixed to the fulcrums 8A3 to 8A7 and 8A10 to 8A14.

  Further, in the direction of the wife, the upper end of the column member 6 is a fulcrum 8A1, 8A2, 8A8, 8A9, and the end of the tension member 5 is fixed to each fulcrum 8A1, 8A2, 8A8, 8A9.

  Further, regarding the square grid formed by the first and second upper chord members 1 and 2, a long bundle member 4A is suspended from the central point 3 of the four grids, and the corners of the four grids. A short bundle 4 </ b> B is suspended from the rating point 3.

  The tension member 5 extends from the lower end of the long bundle 4A in the diagonal direction of the grid, and extends to the grade 3 (grade 3 where the bundles 4A and 4B do not exist) across the diagonal of the next grid. The middle position of the tension member 5 is supported by a short bundle member 4B.

  As shown in FIG. 4, the dead load of the roof frame 10 acts on the stringed beam structure 30, and tension is applied to the supporting members 8A2 and 8A4 and the tension members 5 and 5 straddling the bundle member 4A suspended from an arbitrary rating point 3. When acted (in the X1 direction), the bundle material 4A is pushed upward by the tension members 5 and 5 on which tension is applied (Y1 direction), and a new fulcrum 8B is formed at the rating point 3 by pushing up the bundle material 4A.

  Next, as shown in FIG. 5, when tension acts on the newly formed fulcrum 8B, the fulcrum 8A12 that already exists, and the tension members 5 and 5 straddling the bundle member 4A suspended from the arbitrary rating point 3 ( In the X1 direction), the bundle material 4A is pushed upward by the tension members 5 and 5 on which tension is applied (Y1 direction), and a new fulcrum 8C is formed at the rating point 3 by pushing up the bundle material 4A.

  Furthermore, as shown in FIG. 6, when tension acts on the newly formed fulcrum 8C, the already existing fulcrum 8A6, and the tension members 5 and 5 straddling the bundle member 4A suspended from the arbitrary rating point 3 (X1). Direction), the bundle 4A is pushed upward by the tension members 5 and 5 on which the tension is applied (Y1 direction), and a new fulcrum 8D is formed at the rating point 3 by pushing up the bundle 4A.

  In this way, when tension acts on the tension member 5, the bundle member 4A is pushed upward by the tension member 5, and by the pushing-up of the bundle member 4A, the first and second upper chord members 1 and 2 are graded 3. Support points 8B, 8C, 8D and the like are formed. Between the fulcrums 8B, 8C, 8D and the like formed in this way and the rating point 3 (fulcrum 8A2) already supported by the column member 6 or the like, a separate bundle member 4A is pushed upward by the tensile member 5. A separate fulcrum is further formed in the grade 3 formed in this way. Then, by repeating the formation of such fulcrums, several fulcrums are formed at the plurality of rating points 3.

  By forming a plurality of fulcrums in this way, the span (distance between fulcrums) of the first and second upper chord members 1 and 2 is shortened.

  Since the distance between the fulcrums of the first and second upper chord members 1 and 2 is shortened, the bending moment acting on the first and second upper chord members 1 and 2 is reduced. The beam height of the materials 1 and 2 can be made as low as possible, and the size of the upper chord material to be used can be reduced. And also by the downsizing of such a use member, it leads to slimming of the structural member of the roof frame 10. FIG.

  FIG. 7 is a diagram for explaining that the compressive force for maintaining the tension acting on the tensile material acts on the upper chord material.

  As shown in the drawing, when a tension acts on the tension member 5 (X1 direction), for example, a compressive force acts on the first upper chord material 1 existing inside the four tension members 5 (X2 direction). ), The tension acting on the tensile material 5 is held by this compressive force.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... 1st upper chord material, 2 ... 2nd upper chord material, 3 ... Rating, 4A ... Bundling material (long bundling material), 4B ... Bundling material (short bundling material), 5 ... Tensile material, 6 ... pillar material, 7 ... cane material, 8A1 to 8A14 ... fulcrum, 8B, 8C, 8D ... fulcrum, 10 ... roof frame, 20 ... vertical frame, 30 ... tension string beam structure

Claims (2)

A plurality of first upper chord members in the direction of the wife and a plurality of second upper chord members in the direction of the girder are alternately orthogonal to form a plurality of scores.
A bundle is suspended vertically from some of all the scores,
A roof frame in which a tensile material extending in an oblique direction other than the wobbling direction and the girder direction in a plan view is stretched between a lower end of the bundling material and a point where the bundling material is not suspended. Equipped with a string string structure. The tension acts on the two tension members that connect the tip of a certain bundle material and the two rating points, so that the bundle material is pushed upward and a fulcrum is formed at the rating point where the bundle material is suspended,
Tension acts on two tension members that connect the formed fulcrum and the already formed fulcrum via a separate bundle member, so that the separate bundle member is pushed upward and the separate bundle member A fulcrum is formed at the grading point where
The stringed beam structure according to claim 1, wherein a roof frame is configured by repeating formation of the fulcrum.
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