JP2595057Y2 - Large roof frame - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a large roof frame having a cable structure.

[0002]

2. Description of the Related Art In a large space construction method in which it is desired to reduce the weight of a frame, a cable structure has recently attracted attention. A dome roof already using a cable is described in Japanese Patent Laid-Open Publication No. Hei 3-43534. This dome roof has a number of triangular trusses connected in series in a rotatable manner and a tensioning truss arranged outside the truss. It consists of a cable and a membrane material applied to the inside of the truss. When the tension of the cable is reduced, the dome roof is opened by rotating downward from the uppermost triangular truss.

[0003]

Such a dome roof has a heavy weight because the main body of the frame is a triangular truss. The load of this truss is not a big problem in the case of a dome roof suspended from each other, but it is a heavy burden as a large roof frame of a stadium stand where the arrangement of the columns tends to be limited to one side due to long span. Even if the structure adopts the cable as a tensile material there,
It was difficult to apply to a large roof frame such as a stand.

[0004] This invention provides a large roof frame having a new structure capable of expressing a light and free form by using a strut and a cable as a tension member and capable of coping with own weight, snow load and wind load. It is the purpose.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a vehicle comprising: a plurality of pillars which are inclined outward at predetermined intervals;
A backstay cable extending downward from the top of each pillar to the outside, a lower suspension cable and an upper suspension cable arranged at different vertical lengths from the stretched portion of the backstay cable of each pillar to the inside of the pillar, and an outer end Connected to the lower suspension cable and the inner end to the upper suspension cable, and the inner end suspended obliquely inside each pillar is connected to the upward joint beam and the outer end of the joint beam for each pillar. It consists of a lower suspension cable that has been inserted, an upper suspension cable that has been inserted into the inner end thereof, and a roof membrane material that has been applied to each joint beam. It is configured to be arched by being tensioned and fixed diagonally downward on the inside.

[0006]

[Operation] In the above configuration, the strut functions as a compressive material and the back stay cable, the lower suspension cable, and the lower suspension cable function as a tensile material against the own weight of the frame and the snow load applied to the frame. In addition, the back stay cable, the upper suspension cable, and the upper suspension cable act as tension members against wind load.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawing, reference numeral 1 denotes a column, which is obliquely provided outward at regular intervals. The number of the columns 1 varies depending on the scale of the stand, but it requires about 8 in a span of 300 m. A backstay cable 2 extends obliquely downward from the upper portion of the support 1 outside the support 1.

Further, a lower suspension cable 3 and an upper suspension cable 4 are arranged on four sides inside the support from the portion where the back stay cable 2 of each support 1 is stretched. The lower suspension cable 3 is shorter than the upper suspension cable 4, and is approximately 1/2
Length.

Reference numeral 5 denotes a connecting beam, the outer end of which is a hanging cable 3.
, And the inner ends thereof are respectively connected to the upper hanging cables 4, and are suspended in parallel and diagonally in pairs (see FIG. 3) inside the respective columns 1 with the inner ends facing upward. A lower suspension cable 6 is provided at an outer end of the joint beam 5.
Upper suspension cables 7 are inserted through the inner ends, respectively.
Each of the connecting beams 5 is supported by the upper and lower suspension cables 3 and 4, and is positioned in parallel at regular intervals as shown in FIG.

[0010] Further, both the lower suspension cable 6 and the upper suspension cable 7 are assembled together at one end at both ends at the top and bottom, and are tensioned and fixed diagonally downward inside the column, thereby forming an arch-shaped large roof frame. Is composed.

Reference numeral 8 denotes a roof membrane material made of Teflon-coated glass fiber cloth or the like, which is attached to the joint beams 5 between the lower suspension cable 3 and the upper suspension cable 4, and is provided over the respective connection beams 5 and 5. In addition, 9 and 10 are the foundations of each cable, 11 is the foundation of the column 1, and 12 is the stand. The range in which the roof membrane material 8 is provided extends over the entire area of the large roof frame between the foundations 10 shown in FIG. 3, or a triangular area between the upper and lower suspension cables 6 and 7 on the foundation 10 side. The range excluding each may be used.

FIG. 5 shows an example of the connection of the cables at the joint beam 5. In FIGS. 1 and 3, the upper and lower suspension cables 6, 7 are shown as a single cable. Are composed of 6 to 8 cables, which are inserted into jigs 13 and 14 at both ends of the joint beam 5 in two rows. The vertical suspension cables 3 and 4 and the roof membrane 8 are also attached to the jigs 13 and 14, and although not shown in the drawing, a cable for holding the roof membrane 8 and the like are similarly attached.

In the above configuration, the flow in the vertical direction can be considered in a planar manner. As a design procedure, after calculating each cable tension in a planar manner, the upper and lower suspension cables 6 and 6 are used.
Only for the tension of 7, a method of converting into a three-dimensional force flow can be adopted as shown in FIG. FIG. 2 shows a method for calculating the tension when the suspension cable is assumed to be a circular arc. In the figure, R is the radius of curvature, and q is the external force per unit length applied to the suspension cable equivalent to the suspension cable tension. And the tension _R T of the suspension cable is _R T = q × R.
Further, it is preferable to pre-stress each cable so that the tension does not become zero in any case.

FIG. 4A shows the initial tensions of the own weight and the snow load.
(B) shows the initial tension and reaction force of the wind load. As is apparent from this figure, the strut 1 functions as a compressive material against the own weight and snow load, and other cables except the upper suspension cable 4 and the upper suspension cable 7 function as a tensile material. On the other hand, other cables except the lower suspension cable 3 and the lower suspension cable 6 act as tension members against the wind load.

[0015]

[Effects of the Invention] The present invention has the following effects because a large roof frame such as a stand is constituted by the columns, the vertically suspended cables, the connecting beams, the vertically suspended cables, and the like as described above.

Since the entire structure is a shaft resistance member, and most of the members are constituted by cables acting as tension members, the entire frame is light in weight and has a high degree of freedom, so that it can be used in various plane shapes.

By introducing a prestress into the cable in advance, the overall rigidity can be secured, so that a long span large roof frame having rigidity while having a flexible structure capable of following deformation can be constructed. In addition, a roof frame with an appearance that matches the stadium can be obtained by harmonizing the bright membrane roof and the thin cable.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a large roof frame such as a stand according to the present invention.

FIG. 2 is an explanatory diagram of a design procedure of a suspension cable.

FIG. 3 is a plan view of the large roof frame shown in FIG.

FIG. 4 is an explanatory diagram showing an initial tension and a reaction force with respect to a load.

FIG. 5 is a diagram showing a connection state of cables at a joint beam portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prop 2 Back tee cable 3 Lower suspension cable 4 Upper suspension cable 5 Splice beam 6 Lower suspension cable 7 Upper suspension cable 8 Roof membrane material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04B 1/34 E04B 7/14 E04H 3/14 E04H 15/42 E04H 15/54

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of pillars obliquely inclined outward at predetermined intervals, a backstay cable stretched outward and downward from an upper portion of each pillar, and a backstay cable extending from a portion where the backstay cable is stretched to each pillar. The upper and lower cables are connected to the lower and upper cables, and the outer end is connected to the lower cable and the inner end is connected to the upper cable. It consists of a joint beam whose inner end is upward, a lower suspension cable inserted through the outer end of the joint beam of each column, an upper suspension cable inserted through the inner end, and a roof membrane material applied over each joint beam. A large roof frame, wherein ends of both sides of the lower suspension cable and the upper suspension cable are tensioned and fixed diagonally downward inside the column of columns to form an arch.